[RFC,v2,11/11] ath10k: Added sdio support

Message ID	1479496971-19174-12-git-send-email-erik.stromdahl@gmail.com (mailing list archive)
State	RFC
Delegated to:	Kalle Valo
Headers	show Return-Path: <ath10k-bounces+patchwork-ath10k=patchwork.kernel.org@lists.infradead.org> From: Erik Stromdahl <erik.stromdahl@gmail.com> To: kvalo@qca.qualcomm.com, linux-wireless@vger.kernel.org, ath10k@lists.infradead.org Subject: [RFC v2 11/11] ath10k: Added sdio support Date: Fri, 18 Nov 2016 20:22:51 +0100 Message-Id: <1479496971-19174-12-git-send-email-erik.stromdahl@gmail.com> In-Reply-To: <1479496971-19174-1-git-send-email-erik.stromdahl@gmail.com> References: <1479496971-19174-1-git-send-email-erik.stromdahl@gmail.com> Precedence: list Cc: Erik Stromdahl <erik.stromdahl@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "ath10k" <ath10k-bounces@lists.infradead.org> Errors-To: ath10k-bounces+patchwork-ath10k=patchwork.kernel.org@lists.infradead.org

On 12/16/2016 12:21 PM, Valo, Kalle wrote: > Erik Stromdahl <erik.stromdahl@gmail.com> writes: > >> Initial HIF sdio/mailbox implementation. >> >> Signed-off-by: Erik Stromdahl <erik.stromdahl@gmail.com> > > I know most of this coming from ath6kl but I think we should still > improve the code. Lots of comments will follow, don't get scared :) > I have started to fix most of the review comments below and added a new branch on my git repo (https://github.com/erstrom/linux-ath) for this: ath-201612150919-ath10k-sdio-kvalo-review The changes are quite massive and I am not entirely finished yet. I will of course squash these commits before submitting a new RFC. You can have a look to see where I am heading. The dma_buffer removal was a little bit tricky since there are a lot of places in the code where the sdio functions are called with stack allocated buffers. This does not seem to be a problem on the hardware I am running (NXP/Freescale iMX6ul) but I am afraid that there could be problems on other architectures. Therefore I have introduced some temporary dynamically allocated buffers on a few places. >> +#define CALC_TXRX_PADDED_LEN(ar_sdio, len) \ >> + (__ALIGN_MASK((len), (ar_sdio)->mbox_info.block_mask)) > > I think this could be a proper static inline function. Andrew Morton > once said: "Write in C, not CPP" (or something like that), I think > that's a really good point. > >> +static int ath10k_sdio_read_write_sync(struct ath10k *ar, u32 addr, u8 *buf, >> + u32 len, u32 request); >> +static int ath10k_sdio_hif_diag_read(struct ath10k *ar, u32 address, void *buf, >> + size_t buf_len); >> +static int ath10k_sdio_hif_diag_read32(struct ath10k *ar, u32 address, >> + u32 *value); > > We prefer to avoid forward declarations if at all possible. I didn't > check but if there's a clean way to avoid these please remove them. > >> +/* HIF mbox interrupt handling */ >> + >> +static int ath10k_sdio_mbox_rx_process_packet(struct ath10k_sdio *ar_sdio, >> + struct ath10k_sdio_rx_data *pkt, >> + u32 *lookaheads, >> + int *n_lookaheads) >> +{ > > So the style in ath10k is that all functions (of course this doesn't > apply to callbacks etc) have "struct ath10k *ar" as the first parameter. > This way there's no need to check if a function takes ar or ar_sdio. > >> + int status = 0; > > In ath10k we prefer to use ret. And avoid initialising it, please. > >> + struct ath10k_htc *htc = &ar_sdio->ar->htc; >> + struct sk_buff *skb = pkt->skb; >> + struct ath10k_htc_hdr *htc_hdr = (struct ath10k_htc_hdr *)skb->data; >> + bool trailer_present = htc_hdr->flags & ATH10K_HTC_FLAG_TRAILER_PRESENT; >> + u16 payload_len; >> + >> + payload_len = le16_to_cpu(htc_hdr->len); >> + >> + if (trailer_present) { >> + u8 *trailer; >> + enum ath10k_htc_ep_id eid; >> + >> + trailer = skb->data + sizeof(struct ath10k_htc_hdr) + >> + payload_len - htc_hdr->trailer_len; >> + >> + eid = (enum ath10k_htc_ep_id)htc_hdr->eid; > > A some kind of mapping function for ep id would be nice, it makes it > more visible how it works. > >> +static int ath10k_sdio_mbox_rx_process_packets(struct ath10k_sdio *ar_sdio, >> + u32 lookaheads[], >> + int *n_lookahead) >> +{ >> + struct ath10k *ar = ar_sdio->ar; >> + struct ath10k_htc *htc = &ar->htc; >> + struct ath10k_sdio_rx_data *pkt; >> + int status = 0, i; >> + >> + for (i = 0; i < ar_sdio->n_rx_pkts; i++) { >> + struct ath10k_htc_ep *ep; >> + enum ath10k_htc_ep_id id; >> + u32 *lookaheads_local = lookaheads; >> + int *n_lookahead_local = n_lookahead; >> + >> + id = ((struct ath10k_htc_hdr *)&lookaheads[i])->eid; >> + >> + if (id >= ATH10K_HTC_EP_COUNT) { >> + ath10k_err(ar, "Invalid endpoint in look-ahead: %d\n", >> + id); > > In ath10k we use ath10k_err() for errors from which can't survive and > ath10k_warn() for errors where we try to continue. So ath10k_warn() > would be more approriate here and most of other cases in sdio.c > >> + status = -ENOMEM; >> + goto out; >> + } >> + >> + ep = &htc->endpoint[id]; >> + >> + if (ep->service_id == 0) { >> + ath10k_err(ar, "ep %d is not connected !\n", id); >> + status = -ENOMEM; >> + goto out; >> + } >> + >> + pkt = &ar_sdio->rx_pkts[i]; >> + >> + if (pkt->part_of_bundle && !pkt->last_in_bundle) { >> + /* Only read lookahead's from RX trailers >> + * for the last packet in a bundle. >> + */ >> + lookaheads_local = NULL; >> + n_lookahead_local = NULL; >> + } >> + >> + status = ath10k_sdio_mbox_rx_process_packet(ar_sdio, >> + pkt, >> + lookaheads_local, >> + n_lookahead_local); >> + if (status) >> + goto out; >> + >> + ep->ep_ops.ep_rx_complete(ar_sdio->ar, pkt->skb); >> + /* The RX complete handler now owns the skb...*/ >> + pkt->skb = NULL; >> + pkt->alloc_len = 0; >> + } >> + >> +out: >> + /* Free all packets that was not passed on to the RX completion >> + * handler... >> + */ >> + for (; i < ar_sdio->n_rx_pkts; i++) >> + ath10k_sdio_mbox_free_rx_pkt(&ar_sdio->rx_pkts[i]); > > I got a bit fooled by not initialising i here and only then realised > why. I guess it's ok but a bit of so and so > >> + >> + return status; >> +} >> + >> +static int alloc_pkt_bundle(struct ath10k *ar, >> + struct ath10k_sdio_rx_data *rx_pkts, >> + struct ath10k_htc_hdr *htc_hdr, >> + size_t full_len, size_t act_len, size_t *bndl_cnt) >> +{ >> + int i, status = 0; >> + >> + *bndl_cnt = (htc_hdr->flags & ATH10K_HTC_FLAG_BUNDLE_MASK) >> >> + ATH10K_HTC_FLAG_BUNDLE_LSB; > > We recently got FIELD_GET() and FIELD_PREP() to kernel for handling > bitmasks. ath10k is not yet converted (patches welcome!) but it would be > good to use those already in sdio.c. Also SM() could be replaced with > those. > >> +int ath10k_sdio_mbox_rxmsg_pending_handler(struct ath10k_sdio *ar_sdio, >> + u32 msg_lookahead, bool *done) >> +{ >> + struct ath10k *ar = ar_sdio->ar; >> + int status = 0; >> + u32 lookaheads[ATH10K_SDIO_MAX_RX_MSGS]; >> + int n_lookaheads = 1; >> + >> + *done = true; >> + >> + /* Copy the lookahead obtained from the HTC register table into our >> + * temp array as a start value. >> + */ >> + lookaheads[0] = msg_lookahead; >> + >> + for (;;) { > > Iternal loops in kernel can be dangerous. Better to add some sort of > timeout check with a warning message, something like: > > while ((time_before(jiffies, timeout)) { > } > > if (timed out) > ath10k_warn("timeout in foo"); > >> + /* Try to allocate as many HTC RX packets indicated by >> + * n_lookaheads. >> + */ >> + status = ath10k_sdio_mbox_rx_alloc(ar_sdio, lookaheads, >> + n_lookaheads); >> + if (status) >> + break; >> + >> + if (ar_sdio->n_rx_pkts >= 2) >> + /* A recv bundle was detected, force IRQ status >> + * re-check again. >> + */ >> + *done = false; >> + >> + status = ath10k_sdio_mbox_rx_fetch(ar_sdio); >> + >> + /* Process fetched packets. This will potentially update >> + * n_lookaheads depending on if the packets contain lookahead >> + * reports. >> + */ >> + n_lookaheads = 0; >> + status = ath10k_sdio_mbox_rx_process_packets(ar_sdio, >> + lookaheads, >> + &n_lookaheads); >> + >> + if (!n_lookaheads || status) >> + break; >> + >> + /* For SYNCH processing, if we get here, we are running >> + * through the loop again due to updated lookaheads. Set >> + * flag that we should re-check IRQ status registers again >> + * before leaving IRQ processing, this can net better >> + * performance in high throughput situations. >> + */ >> + *done = false; >> + } >> + >> + if (status && (status != -ECANCELED)) >> + ath10k_err(ar, "failed to get pending recv messages: %d\n", >> + status); >> + >> + if (atomic_read(&ar_sdio->stopping)) { >> + ath10k_warn(ar, "host is going to stop. Turning of RX\n"); >> + ath10k_sdio_hif_rx_control(ar_sdio, false); >> + } > > I'm always skeptic when I use atomic variables used like this, I doubt > it's really correct. > >> + >> + return status; >> +} >> + >> +static int ath10k_sdio_mbox_proc_dbg_intr(struct ath10k_sdio *ar_sdio) >> +{ >> + int ret; >> + u32 dummy; >> + struct ath10k *ar = ar_sdio->ar; >> + >> + ath10k_warn(ar, "firmware crashed\n"); > > We have firmware crash dump support in ath10k. You could add a "TODO:" > comment about implementing that later. > >> +static int ath10k_sdio_mbox_proc_err_intr(struct ath10k_sdio *ar_sdio) >> +{ >> + int status; >> + u8 error_int_status; >> + u8 reg_buf[4]; >> + struct ath10k_sdio_irq_data *irq_data = &ar_sdio->irq_data; >> + struct ath10k *ar = ar_sdio->ar; >> + >> + ath10k_dbg(ar, ATH10K_DBG_SDIO, "error interrupt\n"); >> + >> + error_int_status = irq_data->irq_proc_reg.error_int_status & 0x0F; >> + if (!error_int_status) { >> + WARN_ON(1); >> + return -EIO; >> + } >> + >> + ath10k_dbg(ar, ATH10K_DBG_SDIO, >> + "valid interrupt source(s) in ERROR_INT_STATUS: 0x%x\n", >> + error_int_status); >> + >> + if (MS(error_int_status, MBOX_ERROR_INT_STATUS_WAKEUP)) >> + ath10k_dbg(ar, ATH10K_DBG_SDIO, "error : wakeup\n"); >> + >> + if (MS(error_int_status, MBOX_ERROR_INT_STATUS_RX_UNDERFLOW)) >> + ath10k_err(ar, "rx underflow\n"); >> + >> + if (MS(error_int_status, MBOX_ERROR_INT_STATUS_TX_OVERFLOW)) >> + ath10k_err(ar, "tx overflow\n"); >> + >> + /* Clear the interrupt */ >> + irq_data->irq_proc_reg.error_int_status &= ~error_int_status; >> + >> + /* set W1C value to clear the interrupt, this hits the register first */ >> + reg_buf[0] = error_int_status; >> + reg_buf[1] = 0; >> + reg_buf[2] = 0; >> + reg_buf[3] = 0; >> + >> + status = ath10k_sdio_read_write_sync(ar, >> + MBOX_ERROR_INT_STATUS_ADDRESS, >> + reg_buf, 4, HIF_WR_SYNC_BYTE_FIX); >> + >> + WARN_ON(status); > > This is a bit dangerous, in worst case it can spam the kernel log and > force a host reboot due watchdog timing out etc. > > Better to replace with standard warning message: > > ret = ath10k_sdio_read_write_sync(ar, > MBOX_ERROR_INT_STATUS_ADDRESS, > reg_buf, 4, HIF_WR_SYNC_BYTE_FIX); > if (ret) { > ath10k_warn("failed to read interrupr status: %d", ret); > return ret; > } > >> +static int ath10k_sdio_mbox_proc_cpu_intr(struct ath10k_sdio *ar_sdio) >> +{ >> + int status; >> + struct ath10k_sdio_irq_data *irq_data = &ar_sdio->irq_data; >> + struct ath10k *ar = ar_sdio->ar; >> + u8 cpu_int_status, reg_buf[4]; >> + >> + cpu_int_status = irq_data->irq_proc_reg.cpu_int_status & >> + irq_data->irq_en_reg.cpu_int_status_en; >> + if (!cpu_int_status) { >> + WARN_ON(1); >> + return -EIO; >> + } > > Ditto about WARN_ON(), ath10k_warn() is much better. > >> +/* process pending interrupts synchronously */ >> +static int ath10k_sdio_mbox_proc_pending_irqs(struct ath10k_sdio *ar_sdio, >> + bool *done) >> +{ >> + struct ath10k_sdio_irq_data *irq_data = &ar_sdio->irq_data; >> + struct ath10k *ar = ar_sdio->ar; >> + struct ath10k_sdio_irq_proc_registers *rg; >> + int status = 0; >> + u8 host_int_status = 0; >> + u32 lookahead = 0; >> + u8 htc_mbox = 1 << ATH10K_HTC_MAILBOX; >> + >> + /* NOTE: HIF implementation guarantees that the context of this >> + * call allows us to perform SYNCHRONOUS I/O, that is we can block, >> + * sleep or call any API that can block or switch thread/task >> + * contexts. This is a fully schedulable context. >> + */ >> + >> + /* Process pending intr only when int_status_en is clear, it may >> + * result in unnecessary bus transaction otherwise. Target may be >> + * unresponsive at the time. >> + */ >> + if (irq_data->irq_en_reg.int_status_en) { >> + /* Read the first sizeof(struct ath10k_irq_proc_registers) >> + * bytes of the HTC register table. This >> + * will yield us the value of different int status >> + * registers and the lookahead registers. >> + */ >> + status = ath10k_sdio_read_write_sync( >> + ar, >> + MBOX_HOST_INT_STATUS_ADDRESS, >> + (u8 *)&irq_data->irq_proc_reg, >> + sizeof(irq_data->irq_proc_reg), >> + HIF_RD_SYNC_BYTE_INC); >> + if (status) >> + goto out; >> + >> + /* Update only those registers that are enabled */ >> + host_int_status = irq_data->irq_proc_reg.host_int_status & >> + irq_data->irq_en_reg.int_status_en; >> + >> + /* Look at mbox status */ >> + if (host_int_status & htc_mbox) { >> + /* Mask out pending mbox value, we use look ahead as >> + * the real flag for mbox processing. >> + */ >> + host_int_status &= ~htc_mbox; >> + if (irq_data->irq_proc_reg.rx_lookahead_valid & >> + htc_mbox) { >> + rg = &irq_data->irq_proc_reg; >> + lookahead = le32_to_cpu( >> + rg->rx_lookahead[ATH10K_HTC_MAILBOX]); >> + if (!lookahead) >> + ath10k_err(ar, "lookahead is zero!\n"); >> + } >> + } >> + } >> + >> + if (!host_int_status && !lookahead) { >> + *done = true; >> + goto out; >> + } >> + >> + if (lookahead) { >> + ath10k_dbg(ar, ATH10K_DBG_SDIO, >> + "pending mailbox msg, lookahead: 0x%08X\n", >> + lookahead); >> + >> + status = ath10k_sdio_mbox_rxmsg_pending_handler(ar_sdio, >> + lookahead, >> + done); >> + if (status) >> + goto out; >> + } >> + >> + /* now, handle the rest of the interrupts */ >> + ath10k_dbg(ar, ATH10K_DBG_SDIO, >> + "valid interrupt source(s) for other interrupts: 0x%x\n", >> + host_int_status); >> + >> + if (MS(host_int_status, MBOX_HOST_INT_STATUS_CPU)) { >> + /* CPU Interrupt */ >> + status = ath10k_sdio_mbox_proc_cpu_intr(ar_sdio); >> + if (status) >> + goto out; >> + } >> + >> + if (MS(host_int_status, MBOX_HOST_INT_STATUS_ERROR)) { >> + /* Error Interrupt */ >> + status = ath10k_sdio_mbox_proc_err_intr(ar_sdio); >> + if (status) >> + goto out; >> + } >> + >> + if (MS(host_int_status, MBOX_HOST_INT_STATUS_COUNTER)) >> + /* Counter Interrupt */ >> + status = ath10k_sdio_mbox_proc_counter_intr(ar_sdio); >> + >> +out: >> + /* An optimization to bypass reading the IRQ status registers >> + * unecessarily which can re-wake the target, if upper layers >> + * determine that we are in a low-throughput mode, we can rely on >> + * taking another interrupt rather than re-checking the status >> + * registers which can re-wake the target. >> + * >> + * NOTE : for host interfaces that makes use of detecting pending >> + * mbox messages at hif can not use this optimization due to >> + * possible side effects, SPI requires the host to drain all >> + * messages from the mailbox before exiting the ISR routine. >> + */ >> + >> + ath10k_dbg(ar, ATH10K_DBG_SDIO, >> + "%s: (done:%d, status=%d)\n", __func__, *done, status); > > We try to follow this kind of format for debug messages: > > "sdio pending irqs done %d status %d" > > So start with the debug level name followed by the debug separated with spaces. > > And IIRC no need for "\n", the macro adds that automatically. > >> + >> + return status; >> +} >> + >> +/* Macro to check if DMA buffer is WORD-aligned and DMA-able. >> + * Most host controllers assume the buffer is DMA'able and will >> + * bug-check otherwise (i.e. buffers on the stack). virt_addr_valid >> + * check fails on stack memory. >> + */ >> +static inline bool buf_needs_bounce(u8 *buf) >> +{ >> + return ((unsigned long)buf & 0x3) || !virt_addr_valid(buf); >> +} > > IS_ALIGNED()? And this is super ugly, do we really need this? I would > much prefer that we would directly use struct sk_buff, more of that > later. > >> +static inline enum ath10k_htc_ep_id pipe_id_to_eid(u8 pipe_id) >> +{ >> + return (enum ath10k_htc_ep_id)pipe_id; >> +} > > Oh, we already have a this kind of mapping function? Can't this be used > earlier? > >> +static void ath10k_sdio_set_mbox_info(struct ath10k_sdio *ar_sdio) >> +{ >> + struct ath10k_mbox_info *mbox_info = &ar_sdio->mbox_info; >> + u16 device = ar_sdio->func->device; >> + >> + mbox_info->htc_addr = ATH10K_HIF_MBOX_BASE_ADDR; >> + mbox_info->block_size = ATH10K_HIF_MBOX_BLOCK_SIZE; >> + mbox_info->block_mask = ATH10K_HIF_MBOX_BLOCK_SIZE - 1; >> + mbox_info->gmbox_addr = ATH10K_HIF_GMBOX_BASE_ADDR; >> + mbox_info->gmbox_sz = ATH10K_HIF_GMBOX_WIDTH; >> + >> + mbox_info->ext_info[0].htc_ext_addr = ATH10K_HIF_MBOX0_EXT_BASE_ADDR; >> + >> + if ((device & ATH10K_MANUFACTURER_ID_REV_MASK) < 4) >> + mbox_info->ext_info[0].htc_ext_sz = ATH10K_HIF_MBOX0_EXT_WIDTH; >> + else >> + /* from rome 2.0(0x504), the width has been extended >> + * to 56K >> + */ >> + mbox_info->ext_info[0].htc_ext_sz = >> + ATH10K_HIF_MBOX0_EXT_WIDTH_ROME_2_0; >> + >> + mbox_info->ext_info[1].htc_ext_addr = >> + mbox_info->ext_info[0].htc_ext_addr + >> + mbox_info->ext_info[0].htc_ext_sz + >> + ATH10K_HIF_MBOX_DUMMY_SPACE_SIZE; >> + mbox_info->ext_info[1].htc_ext_sz = ATH10K_HIF_MBOX1_EXT_WIDTH; >> +} >> + >> +static inline void ath10k_sdio_set_cmd52_arg(u32 *arg, u8 write, u8 raw, >> + unsigned int address, >> + unsigned char val) >> +{ >> + const u8 func = 0; >> + >> + *arg = ((write & 1) << 31) | >> + ((func & 0x7) << 28) | >> + ((raw & 1) << 27) | >> + (1 << 26) | >> + ((address & 0x1FFFF) << 9) | >> + (1 << 8) | >> + (val & 0xFF); >> +} > > Quite ugly. FIELD_PREP() & co? > >> + >> +static int ath10k_sdio_func0_cmd52_wr_byte(struct mmc_card *card, >> + unsigned int address, >> + unsigned char byte) >> +{ >> + struct mmc_command io_cmd; >> + >> + memset(&io_cmd, 0, sizeof(io_cmd)); >> + ath10k_sdio_set_cmd52_arg(&io_cmd.arg, 1, 0, address, byte); >> + io_cmd.opcode = SD_IO_RW_DIRECT; >> + io_cmd.flags = MMC_RSP_R5 | MMC_CMD_AC; >> + >> + return mmc_wait_for_cmd(card->host, &io_cmd, 0); >> +} >> + >> +static int ath10k_sdio_func0_cmd52_rd_byte(struct mmc_card *card, >> + unsigned int address, >> + unsigned char *byte) >> +{ >> + int ret; >> + struct mmc_command io_cmd; >> + >> + memset(&io_cmd, 0, sizeof(io_cmd)); >> + ath10k_sdio_set_cmd52_arg(&io_cmd.arg, 0, 0, address, 0); >> + io_cmd.opcode = SD_IO_RW_DIRECT; >> + io_cmd.flags = MMC_RSP_R5 | MMC_CMD_AC; >> + >> + ret = mmc_wait_for_cmd(card->host, &io_cmd, 0); >> + if (!ret) >> + *byte = io_cmd.resp[0]; >> + >> + return ret; >> +} >> + >> +static int ath10k_sdio_io(struct ath10k_sdio *ar_sdio, u32 request, u32 addr, >> + u8 *buf, u32 len) >> +{ >> + int ret = 0; > > Avoid these kind of unnecessary initialisations. > >> + struct sdio_func *func = ar_sdio->func; >> + struct ath10k *ar = ar_sdio->ar; >> + >> + sdio_claim_host(func); >> + >> + if (request & HIF_WRITE) { >> + if (request & HIF_FIXED_ADDRESS) >> + ret = sdio_writesb(func, addr, buf, len); >> + else >> + ret = sdio_memcpy_toio(func, addr, buf, len); >> + } else { >> + if (request & HIF_FIXED_ADDRESS) >> + ret = sdio_readsb(func, buf, addr, len); >> + else >> + ret = sdio_memcpy_fromio(func, buf, addr, len); >> + } >> + >> + sdio_release_host(func); >> + >> + ath10k_dbg(ar, ATH10K_DBG_SDIO, "%s addr 0x%x%s buf 0x%p len %d\n", >> + request & HIF_WRITE ? "wr" : "rd", addr, >> + request & HIF_FIXED_ADDRESS ? " (fixed)" : "", buf, len); >> + ath10k_dbg_dump(ar, ATH10K_DBG_SDIO_DUMP, NULL, >> + request & HIF_WRITE ? "sdio wr " : "sdio rd ", >> + buf, len); >> + >> + return ret; >> +} >> + >> +static struct ath10k_sdio_bus_request >> +*ath10k_sdio_alloc_busreq(struct ath10k_sdio *ar_sdio) >> +{ >> + struct ath10k_sdio_bus_request *bus_req; >> + >> + spin_lock_bh(&ar_sdio->lock); >> + >> + if (list_empty(&ar_sdio->bus_req_freeq)) { >> + spin_unlock_bh(&ar_sdio->lock); >> + return NULL; >> + } >> + >> + bus_req = list_first_entry(&ar_sdio->bus_req_freeq, >> + struct ath10k_sdio_bus_request, list); >> + list_del(&bus_req->list); >> + >> + spin_unlock_bh(&ar_sdio->lock); >> + >> + return bus_req; >> +} >> + >> +static void ath10k_sdio_free_bus_req(struct ath10k_sdio *ar_sdio, >> + struct ath10k_sdio_bus_request *bus_req) >> +{ >> + spin_lock_bh(&ar_sdio->lock); >> + list_add_tail(&bus_req->list, &ar_sdio->bus_req_freeq); >> + spin_unlock_bh(&ar_sdio->lock); >> +} >> + >> +static int ath10k_sdio_read_write_sync(struct ath10k *ar, u32 addr, u8 *buf, >> + u32 len, u32 request) >> +{ >> + struct ath10k_sdio *ar_sdio = ath10k_sdio_priv(ar); >> + u8 *tbuf = NULL; > > Extra space after u8? > >> + int ret; >> + bool bounced = false; >> + >> + if (request & HIF_BLOCK_BASIS) >> + len = round_down(len, ar_sdio->mbox_info.block_size); >> + >> + if (buf_needs_bounce(buf)) { >> + if (!ar_sdio->dma_buffer) >> + return -ENOMEM; >> + /* FIXME: I am not sure if it is always correct to assume >> + * that the SDIO irq is a "fake" irq and sleep is possible. >> + * (this function will get called from >> + * ath10k_sdio_irq_handler >> + */ >> + mutex_lock(&ar_sdio->dma_buffer_mutex); >> + tbuf = ar_sdio->dma_buffer; >> + >> + if (request & HIF_WRITE) >> + memcpy(tbuf, buf, len); >> + >> + bounced = true; >> + } else { >> + tbuf = buf; >> + } > > So I really hate that ar_sdio->dma_buffer, do we really need it? What if > we just get rid of it and allocate struct sk_buff and pass that around? > No need to do extra copying then, I hope :) > >> + >> + ret = ath10k_sdio_io(ar_sdio, request, addr, tbuf, len); >> + if ((request & HIF_READ) && bounced) >> + memcpy(buf, tbuf, len); >> + >> + if (bounced) >> + mutex_unlock(&ar_sdio->dma_buffer_mutex); >> + >> + return ret; >> +} >> + >> +static void __ath10k_sdio_write_async(struct ath10k_sdio *ar_sdio, >> + struct ath10k_sdio_bus_request *req) >> +{ >> + int status; >> + struct ath10k_htc_ep *ep; >> + struct sk_buff *skb; >> + >> + skb = req->skb; >> + status = ath10k_sdio_read_write_sync(ar_sdio->ar, req->address, >> + skb->data, req->len, >> + req->request); >> + ep = &ar_sdio->ar->htc.endpoint[req->eid]; >> + ath10k_htc_notify_tx_completion(ep, skb); >> + ath10k_sdio_free_bus_req(ar_sdio, req); >> +} >> + >> +static void ath10k_sdio_write_async_work(struct work_struct *work) >> +{ >> + struct ath10k_sdio *ar_sdio; >> + struct ath10k_sdio_bus_request *req, *tmp_req; >> + >> + ar_sdio = container_of(work, struct ath10k_sdio, wr_async_work); >> + >> + spin_lock_bh(&ar_sdio->wr_async_lock); >> + list_for_each_entry_safe(req, tmp_req, &ar_sdio->wr_asyncq, list) { >> + list_del(&req->list); >> + spin_unlock_bh(&ar_sdio->wr_async_lock); >> + __ath10k_sdio_write_async(ar_sdio, req); >> + spin_lock_bh(&ar_sdio->wr_async_lock); >> + } >> + spin_unlock_bh(&ar_sdio->wr_async_lock); >> +} >> + >> +static void ath10k_sdio_irq_handler(struct sdio_func *func) >> +{ >> + int status = 0; >> + unsigned long timeout; >> + struct ath10k_sdio *ar_sdio; >> + bool done = false; >> + >> + ar_sdio = sdio_get_drvdata(func); >> + atomic_set(&ar_sdio->irq_handling, 1); >> + >> + /* Release the host during interrupts so we can pick it back up when >> + * we process commands. >> + */ >> + sdio_release_host(ar_sdio->func); >> + >> + timeout = jiffies + ATH10K_SDIO_HIF_COMMUNICATION_TIMEOUT_HZ; >> + while (time_before(jiffies, timeout) && !done) { >> + status = ath10k_sdio_mbox_proc_pending_irqs(ar_sdio, &done); >> + if (status) >> + break; >> + } >> + >> + sdio_claim_host(ar_sdio->func); >> + >> + atomic_set(&ar_sdio->irq_handling, 0); >> + wake_up(&ar_sdio->irq_wq); >> + >> + WARN_ON(status && status != -ECANCELED); >> +} > > Questionable use of an atomic variable again, looks like badly implement > poor man's locking to me. And instead of wake_up() we should workqueues > or threaded irqs (if sdio supports that). > >> + >> +static int ath10k_sdio_hif_disable_intrs(struct ath10k_sdio *ar_sdio) >> +{ >> + int ret; >> + struct ath10k_sdio_irq_enable_reg regs; >> + struct ath10k_sdio_irq_data *irq_data = &ar_sdio->irq_data; >> + >> + memset(&regs, 0, sizeof(regs)); >> + >> + ret = ath10k_sdio_read_write_sync(ar_sdio->ar, >> + MBOX_INT_STATUS_ENABLE_ADDRESS, >> + &regs.int_status_en, sizeof(regs), >> + HIF_WR_SYNC_BYTE_INC); >> + if (ret) { >> + ath10k_err(ar_sdio->ar, "Unable to disable sdio interrupts\n"); >> + return ret; >> + } >> + >> + spin_lock_bh(&irq_data->lock); >> + irq_data->irq_en_reg = regs; >> + spin_unlock_bh(&irq_data->lock); >> + >> + return 0; >> +} >> + >> +static int ath10k_sdio_hif_power_up(struct ath10k *ar) >> +{ >> + struct ath10k_sdio *ar_sdio = ath10k_sdio_priv(ar); >> + struct sdio_func *func = ar_sdio->func; >> + int ret = 0; >> + >> + if (!ar_sdio->is_disabled) >> + return 0; >> + >> + ath10k_dbg(ar, ATH10K_DBG_BOOT, "sdio power on\n"); >> + >> + sdio_claim_host(func); >> + >> + ret = sdio_enable_func(func); >> + if (ret) { >> + ath10k_err(ar, "Unable to enable sdio func: %d)\n", ret); >> + sdio_release_host(func); >> + return ret; >> + } >> + >> + sdio_release_host(func); >> + >> + /* Wait for hardware to initialise. It should take a lot less than >> + * 20 ms but let's be conservative here. >> + */ >> + msleep(20); >> + >> + ar_sdio->is_disabled = false; >> + >> + ret = ath10k_sdio_hif_disable_intrs(ar_sdio); >> + >> + return ret; >> +} >> + >> +static void ath10k_sdio_hif_power_down(struct ath10k *ar) >> +{ >> + struct ath10k_sdio *ar_sdio = ath10k_sdio_priv(ar); >> + int ret; >> + >> + if (ar_sdio->is_disabled) >> + return; >> + >> + ath10k_dbg(ar, ATH10K_DBG_BOOT, "sdio power off\n"); >> + >> + /* Disable the card */ >> + sdio_claim_host(ar_sdio->func); >> + ret = sdio_disable_func(ar_sdio->func); >> + sdio_release_host(ar_sdio->func); >> + >> + if (ret) >> + ath10k_dbg(ar, ATH10K_DBG_BOOT, >> + "Unable to disable sdio: %d\n", ret); > > Shouldn't this be ath10k_warn()? > >> + >> + ar_sdio->is_disabled = true; >> +} >> + >> +int ath10k_sdio_hif_tx_sg(struct ath10k *ar, u8 pipe_id, >> + struct ath10k_hif_sg_item *items, int n_items) >> +{ >> + int i; >> + u32 address; >> + struct ath10k_sdio *ar_sdio = ath10k_sdio_priv(ar); >> + struct ath10k_sdio_bus_request *bus_req; >> + >> + bus_req = ath10k_sdio_alloc_busreq(ar_sdio); >> + >> + if (WARN_ON_ONCE(!bus_req)) >> + return -ENOMEM; > > Is ath10k_warn() more approriate? > >> + for (i = 0; i < n_items; i++) { >> + bus_req->skb = items[i].transfer_context; >> + bus_req->request = HIF_WRITE; >> + bus_req->eid = pipe_id_to_eid(pipe_id); >> + /* Write TX data to the end of the mbox address space */ >> + address = ar_sdio->mbox_addr[bus_req->eid] + >> + ar_sdio->mbox_size[bus_req->eid] - bus_req->skb->len; >> + bus_req->address = address; >> + bus_req->len = CALC_TXRX_PADDED_LEN(ar_sdio, bus_req->skb->len); >> + >> + spin_lock_bh(&ar_sdio->wr_async_lock); >> + list_add_tail(&bus_req->list, &ar_sdio->wr_asyncq); >> + spin_unlock_bh(&ar_sdio->wr_async_lock); >> + } >> + >> + queue_work(ar_sdio->workqueue, &ar_sdio->wr_async_work); >> + >> + return 0; >> +} >> + >> +static int ath10k_sdio_hif_enable_intrs(struct ath10k_sdio *ar_sdio) >> +{ >> + struct ath10k_sdio_irq_enable_reg regs; >> + int status; >> + struct ath10k_sdio_irq_data *irq_data = &ar_sdio->irq_data; >> + >> + memset(&regs, 0, sizeof(regs)); >> + >> + /* Enable all but CPU interrupts */ >> + regs.int_status_en = SM(0x01, MBOX_INT_STATUS_ENABLE_ERROR) | >> + SM(0x01, MBOX_INT_STATUS_ENABLE_CPU) | >> + SM(0x01, MBOX_INT_STATUS_ENABLE_COUNTER); >> + >> + /* NOTE: There are some cases where HIF can do detection of >> + * pending mbox messages which is disabled now. >> + */ >> + regs.int_status_en |= SM(0x01, MBOX_INT_STATUS_ENABLE_MBOX_DATA); >> + >> + /* Set up the CPU Interrupt status Register */ >> + regs.cpu_int_status_en = 0; >> + >> + /* Set up the Error Interrupt status Register */ >> + regs.err_int_status_en = >> + SM(0x01, MBOX_ERROR_STATUS_ENABLE_RX_UNDERFLOW) | >> + SM(0x01, MBOX_ERROR_STATUS_ENABLE_TX_OVERFLOW); >> + >> + /* Enable Counter interrupt status register to get fatal errors for >> + * debugging. >> + */ >> + regs.cntr_int_status_en = SM(ATH10K_SDIO_TARGET_DEBUG_INTR_MASK, >> + MBOX_COUNTER_INT_STATUS_ENABLE_BIT); >> + >> + status = ath10k_sdio_read_write_sync(ar_sdio->ar, >> + MBOX_INT_STATUS_ENABLE_ADDRESS, >> + &regs.int_status_en, sizeof(regs), >> + HIF_WR_SYNC_BYTE_INC); >> + if (status) { >> + ath10k_err(ar_sdio->ar, >> + "failed to update interrupt ctl reg err: %d\n", >> + status); >> + return status; >> + } >> + >> + spin_lock_bh(&irq_data->lock); >> + irq_data->irq_en_reg = regs; >> + spin_unlock_bh(&irq_data->lock); >> + >> + return 0; >> +} >> + >> +static int ath10k_sdio_hif_start(struct ath10k *ar) >> +{ >> + int ret; >> + struct ath10k_sdio *ar_sdio = ath10k_sdio_priv(ar); >> + u32 addr, val; >> + >> + addr = host_interest_item_address(HI_ITEM(hi_acs_flags)); >> + >> + ret = ath10k_sdio_hif_diag_read32(ar, addr, &val); >> + if (ret) { >> + ath10k_err(ar, "Unable to read diag mem: %d\n", ret); >> + goto out; >> + } >> + >> + if (val & HI_ACS_FLAGS_SDIO_SWAP_MAILBOX_FW_ACK) { >> + ath10k_dbg(ar, ATH10K_DBG_SDIO, >> + "Mailbox SWAP Service is enabled\n"); >> + ar_sdio->swap_mbox = true; >> + } >> + >> + /* eid 0 always uses the lower part of the extended mailbox address >> + * space (ext_info[0].htc_ext_addr). >> + */ >> + ar_sdio->mbox_addr[0] = ar_sdio->mbox_info.ext_info[0].htc_ext_addr; >> + ar_sdio->mbox_size[0] = ar_sdio->mbox_info.ext_info[0].htc_ext_sz; >> + >> + sdio_claim_host(ar_sdio->func); >> + >> + /* Register the isr */ >> + ret = sdio_claim_irq(ar_sdio->func, ath10k_sdio_irq_handler); >> + if (ret) { >> + ath10k_err(ar, "Failed to claim sdio irq: %d\n", ret); >> + sdio_release_host(ar_sdio->func); >> + goto out; >> + } >> + >> + sdio_release_host(ar_sdio->func); >> + >> + ret = ath10k_sdio_hif_enable_intrs(ar_sdio); >> + if (ret) >> + ath10k_err(ar, "Failed to enable sdio interrupts: %d\n", ret); >> + >> +out: >> + return ret; >> +} >> + >> +static bool ath10k_sdio_is_on_irq(struct ath10k *ar) >> +{ >> + struct ath10k_sdio *ar_sdio = ath10k_sdio_priv(ar); >> + >> + return !atomic_read(&ar_sdio->irq_handling); >> +} > > Yikes. > >> + >> +static void ath10k_sdio_irq_disable(struct ath10k *ar) >> +{ >> + struct ath10k_sdio *ar_sdio = ath10k_sdio_priv(ar); >> + int ret; >> + >> + sdio_claim_host(ar_sdio->func); >> + >> + atomic_set(&ar_sdio->stopping, 1); >> + >> + if (atomic_read(&ar_sdio->irq_handling)) { >> + sdio_release_host(ar_sdio->func); >> + >> + ret = wait_event_interruptible(ar_sdio->irq_wq, >> + ath10k_sdio_is_on_irq(ar)); >> + if (ret) >> + return; >> + >> + sdio_claim_host(ar_sdio->func); >> + } > > There has to be a better way to implement this, now it feels that it's > just reimplementing the wheel. We should have proper way to wait for > interrupt handlers and workqueues to end etc. > >> + ret = sdio_release_irq(ar_sdio->func); >> + if (ret) >> + ath10k_err(ar, "Failed to release sdio irq: %d\n", ret); >> + >> + sdio_release_host(ar_sdio->func); >> +} >> + >> +static int ath10k_sdio_config(struct ath10k_sdio *ar_sdio) >> +{ >> + struct ath10k *ar = ar_sdio->ar; >> + struct sdio_func *func = ar_sdio->func; >> + unsigned char byte, asyncintdelay = 2; >> + int ret; >> + >> + ath10k_dbg(ar, ATH10K_DBG_BOOT, "SDIO configuration\n"); >> + >> + sdio_claim_host(func); >> + >> + byte = 0; >> + ret = ath10k_sdio_func0_cmd52_rd_byte(func->card, >> + SDIO_CCCR_DRIVE_STRENGTH, >> + &byte); >> + >> + byte = (byte & (~(SDIO_DRIVE_DTSx_MASK << SDIO_DRIVE_DTSx_SHIFT))) | >> + SDIO_DTSx_SET_TYPE_D; > > FIELD_PREP(). There are lots of places where that an be used. > >> +static void ath10k_sdio_write32(struct ath10k *ar, u32 offset, u32 value) >> +{ >> +} >> + >> +static u32 ath10k_sdio_read32(struct ath10k *ar, u32 offset) >> +{ >> + return 0; >> +} > > Somekind of FIXME/TODO comments for write32() and read32()? What > functionality are we going to miss when we don't implement these? > >> +static void ath10k_sdio_hif_send_complete_check(struct ath10k *ar, >> + u8 pipe, int force) >> +{ >> +} >> + >> +static u16 ath10k_sdio_hif_get_free_queue_number(struct ath10k *ar, u8 pipe) >> +{ >> + return 0; >> +} > > Similar comments here also. > >> + >> +static const struct ath10k_hif_ops ath10k_sdio_hif_ops = { >> + .tx_sg = ath10k_sdio_hif_tx_sg, >> + .diag_read = ath10k_sdio_hif_diag_read, >> + .diag_write = ath10k_sdio_diag_write_mem, >> + .exchange_bmi_msg = ath10k_sdio_hif_exchange_bmi_msg, >> + .start = ath10k_sdio_hif_start, >> + .stop = ath10k_sdio_hif_stop, >> + .map_service_to_pipe = ath10k_sdio_hif_map_service_to_pipe, >> + .get_default_pipe = ath10k_sdio_hif_get_default_pipe, >> + .send_complete_check = ath10k_sdio_hif_send_complete_check, >> + .get_free_queue_number = ath10k_sdio_hif_get_free_queue_number, >> + .power_up = ath10k_sdio_hif_power_up, >> + .power_down = ath10k_sdio_hif_power_down, >> + .read32 = ath10k_sdio_read32, >> + .write32 = ath10k_sdio_write32, >> +#ifdef CONFIG_PM >> + .suspend = ath10k_sdio_hif_suspend, >> + .resume = ath10k_sdio_hif_resume, >> +#endif >> + .fetch_cal_eeprom = ath10k_sdio_hif_fetch_cal_eeprom, >> +}; >> + >> +#ifdef CONFIG_PM_SLEEP >> + >> +/* Empty handlers so that mmc subsystem doesn't remove us entirely during >> + * suspend. We instead follow cfg80211 suspend/resume handlers. >> + */ >> +static int ath10k_sdio_pm_suspend(struct device *device) >> +{ >> + return 0; >> +} >> + >> +static int ath10k_sdio_pm_resume(struct device *device) >> +{ >> + return 0; >> +} >> + >> +static SIMPLE_DEV_PM_OPS(ath10k_sdio_pm_ops, ath10k_sdio_pm_suspend, >> + ath10k_sdio_pm_resume); >> + >> +#define ATH10K_SDIO_PM_OPS (&ath10k_sdio_pm_ops) >> + >> +#else >> + >> +#define ATH10K_SDIO_PM_OPS NULL >> + >> +#endif /* CONFIG_PM_SLEEP */ >> + >> +static int ath10k_sdio_probe(struct sdio_func *func, >> + const struct sdio_device_id *id) >> +{ >> + int ret; >> + struct ath10k_sdio *ar_sdio; >> + struct ath10k *ar; >> + int i; >> + enum ath10k_hw_rev hw_rev; >> + >> + hw_rev = ATH10K_HW_QCA6174; > > This needs a comment, at least to remind if ever add something else than > QCA6174 based SDIO design. > >> + >> + ar = ath10k_core_create(sizeof(*ar_sdio), &func->dev, ATH10K_BUS_SDIO, >> + hw_rev, &ath10k_sdio_hif_ops); >> + if (!ar) { >> + dev_err(&func->dev, "failed to allocate core\n"); >> + return -ENOMEM; >> + } >> + >> + ath10k_dbg(ar, ATH10K_DBG_BOOT, >> + "sdio new func %d vendor 0x%x device 0x%x block 0x%x/0x%x\n", >> + func->num, func->vendor, func->device, >> + func->max_blksize, func->cur_blksize); >> + >> + ar_sdio = ath10k_sdio_priv(ar); >> + >> + ar_sdio->dma_buffer = kzalloc(ATH10K_HIF_DMA_BUFFER_SIZE, GFP_KERNEL); >> + if (!ar_sdio->dma_buffer) { >> + ret = -ENOMEM; >> + goto err_core_destroy; >> + } >> + >> + ar_sdio->func = func; >> + sdio_set_drvdata(func, ar_sdio); >> + >> + ar_sdio->is_disabled = true; >> + ar_sdio->ar = ar; >> + >> + spin_lock_init(&ar_sdio->lock); >> + spin_lock_init(&ar_sdio->wr_async_lock); >> + spin_lock_init(&ar_sdio->irq_data.lock); >> + mutex_init(&ar_sdio->dma_buffer_mutex); >> + >> + INIT_LIST_HEAD(&ar_sdio->bus_req_freeq); >> + INIT_LIST_HEAD(&ar_sdio->wr_asyncq); >> + >> + INIT_WORK(&ar_sdio->wr_async_work, ath10k_sdio_write_async_work); >> + ar_sdio->workqueue = create_singlethread_workqueue("ath10k_sdio_wq"); >> + if (!ar_sdio->workqueue) >> + goto err; >> + >> + init_waitqueue_head(&ar_sdio->irq_wq); >> + >> + for (i = 0; i < ATH10K_SDIO_BUS_REQUEST_MAX_NUM; i++) >> + ath10k_sdio_free_bus_req(ar_sdio, &ar_sdio->bus_req[i]); >> + >> + ar->dev_id = id->device; >> + ar->id.vendor = id->vendor; >> + ar->id.device = id->device; >> + >> + ath10k_sdio_set_mbox_info(ar_sdio); >> + >> + ret = ath10k_sdio_config(ar_sdio); >> + if (ret) { >> + ath10k_err(ar, "Failed to config sdio: %d\n", ret); >> + goto err; >> + } >> + >> + ret = ath10k_core_register(ar, 0/*chip_id is not applicaple for SDIO*/); >> + if (ret) { >> + ath10k_err(ar, "failed to register driver core: %d\n", ret); >> + goto err; >> + } > > I would assume that chip_id is applicaple also with SDIO, there has to > be a register where to get it. Also this kind of comment style is > preferred: > > /* TODO: don't know yet how to get chip_id with SDIO */ > chip_id = 0; > > ret = ath10k_core_register(ar, chip_id); > >> + >> + return ret; >> + >> +err: >> + kfree(ar_sdio->dma_buffer); >> +err_core_destroy: >> + ath10k_core_destroy(ar); >> + >> + return ret; >> +} >> + >> +static void ath10k_sdio_remove(struct sdio_func *func) >> +{ >> + struct ath10k_sdio *ar_sdio; >> + struct ath10k *ar; >> + >> + ar_sdio = sdio_get_drvdata(func); >> + ar = ar_sdio->ar; >> + >> + ath10k_dbg(ar, ATH10K_DBG_BOOT, >> + "sdio removed func %d vendor 0x%x device 0x%x\n", >> + func->num, func->vendor, func->device); >> + >> + (void)ath10k_sdio_hif_disable_intrs(ar_sdio); >> + cancel_work_sync(&ar_sdio->wr_async_work); >> + ath10k_core_unregister(ar); >> + ath10k_core_destroy(ar); >> + >> + kfree(ar_sdio->dma_buffer); >> +} >> + >> +static const struct sdio_device_id ath10k_sdio_devices[] = { >> + {SDIO_DEVICE(ATH10K_MANUFACTURER_CODE, >> + (ATH10K_MANUFACTURER_ID_AR6005_BASE | 0xA))}, >> + {}, >> +}; > > I suspect there's a more sensible way to create the device table than > this, just no time to check it now. Anyone know? > > The naming "ath10k manufacturer" is also wrong, it should be QCA or > Qualcomm. >

diff --git a/drivers/net/wireless/ath/ath10k/Kconfig b/drivers/net/wireless/ath/ath10k/Kconfig index db1ca62..9a03178 100644 --- a/drivers/net/wireless/ath/ath10k/Kconfig +++ b/drivers/net/wireless/ath/ath10k/Kconfig @@ -21,6 +21,12 @@ config ATH10K_AHB ---help--- This module adds support for AHB bus +config ATH10K_SDIO + tristate "Atheros ath10k SDIO support (EXPERIMENTAL)" + depends on ATH10K && MMC + ---help--- + This module adds support for SDIO/MMC bus + config ATH10K_DEBUG bool "Atheros ath10k debugging" depends on ATH10K diff --git a/drivers/net/wireless/ath/ath10k/Makefile b/drivers/net/wireless/ath/ath10k/Makefile index 930fadd..b0b19a7 100644 --- a/drivers/net/wireless/ath/ath10k/Makefile +++ b/drivers/net/wireless/ath/ath10k/Makefile @@ -27,5 +27,8 @@ ath10k_pci-y += pci.o \ ath10k_pci-$(CONFIG_ATH10K_AHB) += ahb.o +obj-$(CONFIG_ATH10K_SDIO) += ath10k_sdio.o +ath10k_sdio-y += sdio.o + # for tracing framework to find trace.h CFLAGS_trace.o := -I$(src) diff --git a/drivers/net/wireless/ath/ath10k/sdio.c b/drivers/net/wireless/ath/ath10k/sdio.c new file mode 100644 index 0000000..4c123d9 --- /dev/null +++ b/drivers/net/wireless/ath/ath10k/sdio.c @@ -0,0 +1,1860 @@ +/* + * Copyright (c) 2004-2011 Atheros Communications Inc. + * Copyright (c) 2011-2012 Qualcomm Atheros, Inc. + * Copyright (c) 2016 Kapsch Trafficcom AB + * + * Permission to use, copy, modify, and/or distribute this software for any + * purpose with or without fee is hereby granted, provided that the above + * copyright notice and this permission notice appear in all copies. + * + * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES + * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR + * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES + * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN + * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF + * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. + */ + +#include <linux/module.h> +#include <linux/mmc/card.h> +#include <linux/mmc/mmc.h> +#include <linux/mmc/host.h> +#include <linux/mmc/sdio_func.h> +#include <linux/mmc/sdio_ids.h> +#include <linux/mmc/sdio.h> +#include <linux/mmc/sd.h> +#include "core.h" +#include "bmi.h" +#include "debug.h" +#include "hif.h" +#include "htc.h" +#include "targaddrs.h" +#include "trace.h" +#include "sdio.h" + +#define CALC_TXRX_PADDED_LEN(ar_sdio, len) \ + (__ALIGN_MASK((len), (ar_sdio)->mbox_info.block_mask)) + +static int ath10k_sdio_read_write_sync(struct ath10k *ar, u32 addr, u8 *buf, + u32 len, u32 request); +static int ath10k_sdio_hif_diag_read(struct ath10k *ar, u32 address, void *buf, + size_t buf_len); +static int ath10k_sdio_hif_diag_read32(struct ath10k *ar, u32 address, + u32 *value); + +/* HIF mbox interrupt handling */ + +static int ath10k_sdio_mbox_rx_process_packet(struct ath10k_sdio *ar_sdio, + struct ath10k_sdio_rx_data *pkt, + u32 *lookaheads, + int *n_lookaheads) +{ + int status = 0; + struct ath10k_htc *htc = &ar_sdio->ar->htc; + struct sk_buff *skb = pkt->skb; + struct ath10k_htc_hdr *htc_hdr = (struct ath10k_htc_hdr *)skb->data; + bool trailer_present = htc_hdr->flags & ATH10K_HTC_FLAG_TRAILER_PRESENT; + u16 payload_len; + + payload_len = le16_to_cpu(htc_hdr->len); + + if (trailer_present) { + u8 *trailer; + enum ath10k_htc_ep_id eid; + + trailer = skb->data + sizeof(struct ath10k_htc_hdr) + + payload_len - htc_hdr->trailer_len; + + eid = (enum ath10k_htc_ep_id)htc_hdr->eid; + + status = ath10k_htc_process_trailer(htc, + trailer, + htc_hdr->trailer_len, + eid, + lookaheads, + n_lookaheads); + if (status) + goto err; + + skb_pull(skb, sizeof(*htc_hdr)); + skb_trim(skb, skb->len - htc_hdr->trailer_len); + } + +err: + return status; +} + +static inline void ath10k_sdio_mbox_free_rx_pkt(struct ath10k_sdio_rx_data *pkt) +{ + dev_kfree_skb(pkt->skb); + pkt->skb = NULL; + pkt->alloc_len = 0; + pkt->act_len = 0; +} + +static inline int ath10k_sdio_mbox_alloc_rx_pkt(struct ath10k_sdio_rx_data *pkt, + size_t act_len, size_t full_len, + bool part_of_bundle, + bool last_in_bundle) +{ + pkt->skb = dev_alloc_skb(full_len); + if (!pkt->skb) + return -ENOMEM; + + pkt->act_len = act_len; + pkt->alloc_len = full_len; + pkt->part_of_bundle = part_of_bundle; + pkt->last_in_bundle = last_in_bundle; + + return 0; +} + +static int ath10k_sdio_mbox_rx_process_packets(struct ath10k_sdio *ar_sdio, + u32 lookaheads[], + int *n_lookahead) +{ + struct ath10k *ar = ar_sdio->ar; + struct ath10k_htc *htc = &ar->htc; + struct ath10k_sdio_rx_data *pkt; + int status = 0, i; + + for (i = 0; i < ar_sdio->n_rx_pkts; i++) { + struct ath10k_htc_ep *ep; + enum ath10k_htc_ep_id id; + u32 *lookaheads_local = lookaheads; + int *n_lookahead_local = n_lookahead; + + id = ((struct ath10k_htc_hdr *)&lookaheads[i])->eid; + + if (id >= ATH10K_HTC_EP_COUNT) { + ath10k_err(ar, "Invalid endpoint in look-ahead: %d\n", + id); + status = -ENOMEM; + goto out; + } + + ep = &htc->endpoint[id]; + + if (ep->service_id == 0) { + ath10k_err(ar, "ep %d is not connected !\n", id); + status = -ENOMEM; + goto out; + } + + pkt = &ar_sdio->rx_pkts[i]; + + if (pkt->part_of_bundle && !pkt->last_in_bundle) { + /* Only read lookahead's from RX trailers + * for the last packet in a bundle. + */ + lookaheads_local = NULL; + n_lookahead_local = NULL; + } + + status = ath10k_sdio_mbox_rx_process_packet(ar_sdio, + pkt, + lookaheads_local, + n_lookahead_local); + if (status) + goto out; + + ep->ep_ops.ep_rx_complete(ar_sdio->ar, pkt->skb); + /* The RX complete handler now owns the skb...*/ + pkt->skb = NULL; + pkt->alloc_len = 0; + } + +out: + /* Free all packets that was not passed on to the RX completion + * handler... + */ + for (; i < ar_sdio->n_rx_pkts; i++) + ath10k_sdio_mbox_free_rx_pkt(&ar_sdio->rx_pkts[i]); + + return status; +} + +static int alloc_pkt_bundle(struct ath10k *ar, + struct ath10k_sdio_rx_data *rx_pkts, + struct ath10k_htc_hdr *htc_hdr, + size_t full_len, size_t act_len, size_t *bndl_cnt) +{ + int i, status = 0; + + *bndl_cnt = (htc_hdr->flags & ATH10K_HTC_FLAG_BUNDLE_MASK) >> + ATH10K_HTC_FLAG_BUNDLE_LSB; + + if (*bndl_cnt > HTC_HOST_MAX_MSG_PER_BUNDLE) { + ath10k_err(ar, + "HTC bundle len %u exceeds maximum %u !\n", + le16_to_cpu(htc_hdr->len), + HTC_HOST_MAX_MSG_PER_BUNDLE); + status = -ENOMEM; + goto out; + } + + /* Allocate bndl_cnt extra skb's for the bundle. + * The package containing the + * ATH10K_HTC_FLAG_BUNDLE_MASK flag is not included + * in bndl_cnt. The skb for that packet will be + * allocated separately. + */ + for (i = 0; i < *bndl_cnt; i++) { + status = ath10k_sdio_mbox_alloc_rx_pkt(&rx_pkts[i], + act_len, + full_len, + true, + false); + if (status) + goto out; + } + +out: + return status; +} + +static int ath10k_sdio_mbox_rx_alloc(struct ath10k_sdio *ar_sdio, + u32 lookaheads[], int n_lookaheads) +{ + int status = 0, i; + struct ath10k *ar = ar_sdio->ar; + + if (n_lookaheads > ATH10K_SDIO_MAX_RX_MSGS) { + ath10k_err(ar, + "The total number of pkgs to be fetched (%u) exceeds maximum %u !\n", + n_lookaheads, + ATH10K_SDIO_MAX_RX_MSGS); + status = -ENOMEM; + goto err; + } + + for (i = 0; i < n_lookaheads; i++) { + struct ath10k_htc_hdr *htc_hdr = + (struct ath10k_htc_hdr *)&lookaheads[i]; + size_t full_len, act_len; + bool last_in_bundle = false; + + if (le16_to_cpu(htc_hdr->len) > + ATH10K_HTC_MBOX_MAX_PAYLOAD_LENGTH) { + ath10k_err(ar, + "payload len %d exceeds max htc : %u!\n", + le16_to_cpu(htc_hdr->len), + ATH10K_HTC_MBOX_MAX_PAYLOAD_LENGTH); + status = -ENOMEM; + goto err; + } + + act_len = le16_to_cpu(htc_hdr->len) + sizeof(*htc_hdr); + full_len = CALC_TXRX_PADDED_LEN(ar_sdio, act_len); + + if (full_len > ATH10K_SDIO_MAX_BUFFER_SIZE) { + ath10k_warn(ar, + "Rx buffer requested with invalid length htc_hdr:eid %d, flags 0x%x, len %d\n", + htc_hdr->eid, htc_hdr->flags, + le16_to_cpu(htc_hdr->len)); + status = -EINVAL; + goto err; + } + + if (htc_hdr->flags & ATH10K_HTC_FLAG_BUNDLE_MASK) { + /* HTC header indicates that every packet to follow + * has the same padded length so that it can be + * optimally fetched as a full bundle. + */ + size_t bndl_cnt; + + status = alloc_pkt_bundle(ar, &ar_sdio->rx_pkts[i], + htc_hdr, + full_len, act_len, &bndl_cnt); + + n_lookaheads += bndl_cnt; + i += bndl_cnt; + /*Next buffer will be the last in the bundle */ + last_in_bundle = true; + } + + /* Allocate skb for packet. If the packet had the + * ATH10K_HTC_FLAG_BUNDLE_MASK flag set, all bundled + * packet skb's have been allocated in the previous step. + */ + status = ath10k_sdio_mbox_alloc_rx_pkt(&ar_sdio->rx_pkts[i], + act_len, + full_len, + last_in_bundle, + last_in_bundle); + } + + ar_sdio->n_rx_pkts = i; + + return 0; +err: + + for (i = 0; i < ATH10K_SDIO_MAX_RX_MSGS; i++) { + if (!ar_sdio->rx_pkts[i].alloc_len) + break; + ath10k_sdio_mbox_free_rx_pkt(&ar_sdio->rx_pkts[i]); + } + + return status; +} + +static int ath10k_sdio_mbox_rx_packet(struct ath10k_sdio *ar_sdio, + struct ath10k_sdio_rx_data *pkt) +{ + struct ath10k *ar = ar_sdio->ar; + struct sk_buff *skb = pkt->skb; + int status; + + status = ath10k_sdio_read_write_sync(ar, + ar_sdio->mbox_info.htc_addr, + skb->data, pkt->alloc_len, + HIF_RD_SYNC_BLOCK_FIX); + + pkt->status = status; + if (!status) + skb_put(skb, pkt->act_len); + + return status; +} + +static int ath10k_sdio_mbox_rx_fetch(struct ath10k_sdio *ar_sdio) +{ + int i, status = 0; + + for (i = 0; i < ar_sdio->n_rx_pkts; i++) { + status = ath10k_sdio_mbox_rx_packet(ar_sdio, + &ar_sdio->rx_pkts[i]); + if (status) + goto err; + } + + return 0; +err: + /* Free all packets that was not successfully fetched. */ + for (; i < ar_sdio->n_rx_pkts; i++) + ath10k_sdio_mbox_free_rx_pkt(&ar_sdio->rx_pkts[i]); + + return status; +} + +/* Disable packet reception (used in case the host runs out of buffers) + * using the interrupt enable registers through the host I/F + */ +static int ath10k_sdio_hif_rx_control(struct ath10k_sdio *ar_sdio, + bool enable_rx) +{ + int status = 0; + struct ath10k_sdio_irq_enable_reg regs; + struct ath10k_sdio_irq_data *irq_data = &ar_sdio->irq_data; + + ath10k_dbg(ar_sdio->ar, ATH10K_DBG_SDIO, "hif rx %s\n", + enable_rx ? "enable" : "disable"); + + spin_lock_bh(&irq_data->lock); + + if (enable_rx) + irq_data->irq_en_reg.int_status_en |= + SM(0x01, MBOX_INT_STATUS_ENABLE_MBOX_DATA); + else + irq_data->irq_en_reg.int_status_en &= + ~SM(0x01, MBOX_INT_STATUS_ENABLE_MBOX_DATA); + + regs = irq_data->irq_en_reg; + + spin_unlock_bh(&irq_data->lock); + + status = ath10k_sdio_read_write_sync(ar_sdio->ar, + MBOX_INT_STATUS_ENABLE_ADDRESS, + &regs.int_status_en, sizeof(regs), + HIF_WR_SYNC_BYTE_INC); + + return status; +} + +int ath10k_sdio_mbox_rxmsg_pending_handler(struct ath10k_sdio *ar_sdio, + u32 msg_lookahead, bool *done) +{ + struct ath10k *ar = ar_sdio->ar; + int status = 0; + u32 lookaheads[ATH10K_SDIO_MAX_RX_MSGS]; + int n_lookaheads = 1; + + *done = true; + + /* Copy the lookahead obtained from the HTC register table into our + * temp array as a start value. + */ + lookaheads[0] = msg_lookahead; + + for (;;) { + /* Try to allocate as many HTC RX packets indicated by + * n_lookaheads. + */ + status = ath10k_sdio_mbox_rx_alloc(ar_sdio, lookaheads, + n_lookaheads); + if (status) + break; + + if (ar_sdio->n_rx_pkts >= 2) + /* A recv bundle was detected, force IRQ status + * re-check again. + */ + *done = false; + + status = ath10k_sdio_mbox_rx_fetch(ar_sdio); + + /* Process fetched packets. This will potentially update + * n_lookaheads depending on if the packets contain lookahead + * reports. + */ + n_lookaheads = 0; + status = ath10k_sdio_mbox_rx_process_packets(ar_sdio, + lookaheads, + &n_lookaheads); + + if (!n_lookaheads || status) + break; + + /* For SYNCH processing, if we get here, we are running + * through the loop again due to updated lookaheads. Set + * flag that we should re-check IRQ status registers again + * before leaving IRQ processing, this can net better + * performance in high throughput situations. + */ + *done = false; + } + + if (status && (status != -ECANCELED)) + ath10k_err(ar, "failed to get pending recv messages: %d\n", + status); + + if (atomic_read(&ar_sdio->stopping)) { + ath10k_warn(ar, "host is going to stop. Turning of RX\n"); + ath10k_sdio_hif_rx_control(ar_sdio, false); + } + + return status; +} + +static int ath10k_sdio_mbox_proc_dbg_intr(struct ath10k_sdio *ar_sdio) +{ + int ret; + u32 dummy; + struct ath10k *ar = ar_sdio->ar; + + ath10k_warn(ar, "firmware crashed\n"); + + /* read counter to clear the interrupt, the debug error interrupt is + * counter 0. + */ + ret = ath10k_sdio_read_write_sync(ar, MBOX_COUNT_DEC_ADDRESS, + (u8 *)&dummy, 4, + HIF_RD_SYNC_BYTE_INC); + if (ret) + ath10k_warn(ar, "Failed to clear debug interrupt: %d\n", ret); + + return ret; +} + +static int ath10k_sdio_mbox_proc_counter_intr(struct ath10k_sdio *ar_sdio) +{ + u8 counter_int_status; + struct ath10k_sdio_irq_data *irq_data = &ar_sdio->irq_data; + + counter_int_status = irq_data->irq_proc_reg.counter_int_status & + irq_data->irq_en_reg.cntr_int_status_en; + + /* NOTE: other modules like GMBOX may use the counter interrupt for + * credit flow control on other counters, we only need to check for + * the debug assertion counter interrupt. + */ + if (counter_int_status & ATH10K_SDIO_TARGET_DEBUG_INTR_MASK) + return ath10k_sdio_mbox_proc_dbg_intr(ar_sdio); + + return 0; +} + +static int ath10k_sdio_mbox_proc_err_intr(struct ath10k_sdio *ar_sdio) +{ + int status; + u8 error_int_status; + u8 reg_buf[4]; + struct ath10k_sdio_irq_data *irq_data = &ar_sdio->irq_data; + struct ath10k *ar = ar_sdio->ar; + + ath10k_dbg(ar, ATH10K_DBG_SDIO, "error interrupt\n"); + + error_int_status = irq_data->irq_proc_reg.error_int_status & 0x0F; + if (!error_int_status) { + WARN_ON(1); + return -EIO; + } + + ath10k_dbg(ar, ATH10K_DBG_SDIO, + "valid interrupt source(s) in ERROR_INT_STATUS: 0x%x\n", + error_int_status); + + if (MS(error_int_status, MBOX_ERROR_INT_STATUS_WAKEUP)) + ath10k_dbg(ar, ATH10K_DBG_SDIO, "error : wakeup\n"); + + if (MS(error_int_status, MBOX_ERROR_INT_STATUS_RX_UNDERFLOW)) + ath10k_err(ar, "rx underflow\n"); + + if (MS(error_int_status, MBOX_ERROR_INT_STATUS_TX_OVERFLOW)) + ath10k_err(ar, "tx overflow\n"); + + /* Clear the interrupt */ + irq_data->irq_proc_reg.error_int_status &= ~error_int_status; + + /* set W1C value to clear the interrupt, this hits the register first */ + reg_buf[0] = error_int_status; + reg_buf[1] = 0; + reg_buf[2] = 0; + reg_buf[3] = 0; + + status = ath10k_sdio_read_write_sync(ar, + MBOX_ERROR_INT_STATUS_ADDRESS, + reg_buf, 4, HIF_WR_SYNC_BYTE_FIX); + + WARN_ON(status); + + return status; +} + +static int ath10k_sdio_mbox_proc_cpu_intr(struct ath10k_sdio *ar_sdio) +{ + int status; + struct ath10k_sdio_irq_data *irq_data = &ar_sdio->irq_data; + struct ath10k *ar = ar_sdio->ar; + u8 cpu_int_status, reg_buf[4]; + + cpu_int_status = irq_data->irq_proc_reg.cpu_int_status & + irq_data->irq_en_reg.cpu_int_status_en; + if (!cpu_int_status) { + WARN_ON(1); + return -EIO; + } + + /* Clear the interrupt */ + irq_data->irq_proc_reg.cpu_int_status &= ~cpu_int_status; + + /* Set up the register transfer buffer to hit the register 4 times , + * this is done to make the access 4-byte aligned to mitigate issues + * with host bus interconnects that restrict bus transfer lengths to + * be a multiple of 4-bytes. + */ + + /* set W1C value to clear the interrupt, this hits the register first */ + reg_buf[0] = cpu_int_status; + /* the remaining are set to zero which have no-effect */ + reg_buf[1] = 0; + reg_buf[2] = 0; + reg_buf[3] = 0; + + status = ath10k_sdio_read_write_sync(ar, + MBOX_CPU_INT_STATUS_ADDRESS, + reg_buf, 4, HIF_WR_SYNC_BYTE_FIX); + + WARN_ON(status); + + return status; +} + +/* process pending interrupts synchronously */ +static int ath10k_sdio_mbox_proc_pending_irqs(struct ath10k_sdio *ar_sdio, + bool *done) +{ + struct ath10k_sdio_irq_data *irq_data = &ar_sdio->irq_data; + struct ath10k *ar = ar_sdio->ar; + struct ath10k_sdio_irq_proc_registers *rg; + int status = 0; + u8 host_int_status = 0; + u32 lookahead = 0; + u8 htc_mbox = 1 << ATH10K_HTC_MAILBOX; + + /* NOTE: HIF implementation guarantees that the context of this + * call allows us to perform SYNCHRONOUS I/O, that is we can block, + * sleep or call any API that can block or switch thread/task + * contexts. This is a fully schedulable context. + */ + + /* Process pending intr only when int_status_en is clear, it may + * result in unnecessary bus transaction otherwise. Target may be + * unresponsive at the time. + */ + if (irq_data->irq_en_reg.int_status_en) { + /* Read the first sizeof(struct ath10k_irq_proc_registers) + * bytes of the HTC register table. This + * will yield us the value of different int status + * registers and the lookahead registers. + */ + status = ath10k_sdio_read_write_sync( + ar, + MBOX_HOST_INT_STATUS_ADDRESS, + (u8 *)&irq_data->irq_proc_reg, + sizeof(irq_data->irq_proc_reg), + HIF_RD_SYNC_BYTE_INC); + if (status) + goto out; + + /* Update only those registers that are enabled */ + host_int_status = irq_data->irq_proc_reg.host_int_status & + irq_data->irq_en_reg.int_status_en; + + /* Look at mbox status */ + if (host_int_status & htc_mbox) { + /* Mask out pending mbox value, we use look ahead as + * the real flag for mbox processing. + */ + host_int_status &= ~htc_mbox; + if (irq_data->irq_proc_reg.rx_lookahead_valid & + htc_mbox) { + rg = &irq_data->irq_proc_reg; + lookahead = le32_to_cpu( + rg->rx_lookahead[ATH10K_HTC_MAILBOX]); + if (!lookahead) + ath10k_err(ar, "lookahead is zero!\n"); + } + } + } + + if (!host_int_status && !lookahead) { + *done = true; + goto out; + } + + if (lookahead) { + ath10k_dbg(ar, ATH10K_DBG_SDIO, + "pending mailbox msg, lookahead: 0x%08X\n", + lookahead); + + status = ath10k_sdio_mbox_rxmsg_pending_handler(ar_sdio, + lookahead, + done); + if (status) + goto out; + } + + /* now, handle the rest of the interrupts */ + ath10k_dbg(ar, ATH10K_DBG_SDIO, + "valid interrupt source(s) for other interrupts: 0x%x\n", + host_int_status); + + if (MS(host_int_status, MBOX_HOST_INT_STATUS_CPU)) { + /* CPU Interrupt */ + status = ath10k_sdio_mbox_proc_cpu_intr(ar_sdio); + if (status) + goto out; + } + + if (MS(host_int_status, MBOX_HOST_INT_STATUS_ERROR)) { + /* Error Interrupt */ + status = ath10k_sdio_mbox_proc_err_intr(ar_sdio); + if (status) + goto out; + } + + if (MS(host_int_status, MBOX_HOST_INT_STATUS_COUNTER)) + /* Counter Interrupt */ + status = ath10k_sdio_mbox_proc_counter_intr(ar_sdio); + +out: + /* An optimization to bypass reading the IRQ status registers + * unecessarily which can re-wake the target, if upper layers + * determine that we are in a low-throughput mode, we can rely on + * taking another interrupt rather than re-checking the status + * registers which can re-wake the target. + * + * NOTE : for host interfaces that makes use of detecting pending + * mbox messages at hif can not use this optimization due to + * possible side effects, SPI requires the host to drain all + * messages from the mailbox before exiting the ISR routine. + */ + + ath10k_dbg(ar, ATH10K_DBG_SDIO, + "%s: (done:%d, status=%d)\n", __func__, *done, status); + + return status; +} + +/* Macro to check if DMA buffer is WORD-aligned and DMA-able. + * Most host controllers assume the buffer is DMA'able and will + * bug-check otherwise (i.e. buffers on the stack). virt_addr_valid + * check fails on stack memory. + */ +static inline bool buf_needs_bounce(u8 *buf) +{ + return ((unsigned long)buf & 0x3) || !virt_addr_valid(buf); +} + +static inline enum ath10k_htc_ep_id pipe_id_to_eid(u8 pipe_id) +{ + return (enum ath10k_htc_ep_id)pipe_id; +} + +static void ath10k_sdio_set_mbox_info(struct ath10k_sdio *ar_sdio) +{ + struct ath10k_mbox_info *mbox_info = &ar_sdio->mbox_info; + u16 device = ar_sdio->func->device; + + mbox_info->htc_addr = ATH10K_HIF_MBOX_BASE_ADDR; + mbox_info->block_size = ATH10K_HIF_MBOX_BLOCK_SIZE; + mbox_info->block_mask = ATH10K_HIF_MBOX_BLOCK_SIZE - 1; + mbox_info->gmbox_addr = ATH10K_HIF_GMBOX_BASE_ADDR; + mbox_info->gmbox_sz = ATH10K_HIF_GMBOX_WIDTH; + + mbox_info->ext_info[0].htc_ext_addr = ATH10K_HIF_MBOX0_EXT_BASE_ADDR; + + if ((device & ATH10K_MANUFACTURER_ID_REV_MASK) < 4) + mbox_info->ext_info[0].htc_ext_sz = ATH10K_HIF_MBOX0_EXT_WIDTH; + else + /* from rome 2.0(0x504), the width has been extended + * to 56K + */ + mbox_info->ext_info[0].htc_ext_sz = + ATH10K_HIF_MBOX0_EXT_WIDTH_ROME_2_0; + + mbox_info->ext_info[1].htc_ext_addr = + mbox_info->ext_info[0].htc_ext_addr + + mbox_info->ext_info[0].htc_ext_sz + + ATH10K_HIF_MBOX_DUMMY_SPACE_SIZE; + mbox_info->ext_info[1].htc_ext_sz = ATH10K_HIF_MBOX1_EXT_WIDTH; +} + +static inline void ath10k_sdio_set_cmd52_arg(u32 *arg, u8 write, u8 raw, + unsigned int address, + unsigned char val) +{ + const u8 func = 0; + + *arg = ((write & 1) << 31) | + ((func & 0x7) << 28) | + ((raw & 1) << 27) | + (1 << 26) | + ((address & 0x1FFFF) << 9) | + (1 << 8) | + (val & 0xFF); +} + +static int ath10k_sdio_func0_cmd52_wr_byte(struct mmc_card *card, + unsigned int address, + unsigned char byte) +{ + struct mmc_command io_cmd; + + memset(&io_cmd, 0, sizeof(io_cmd)); + ath10k_sdio_set_cmd52_arg(&io_cmd.arg, 1, 0, address, byte); + io_cmd.opcode = SD_IO_RW_DIRECT; + io_cmd.flags = MMC_RSP_R5 | MMC_CMD_AC; + + return mmc_wait_for_cmd(card->host, &io_cmd, 0); +} + +static int ath10k_sdio_func0_cmd52_rd_byte(struct mmc_card *card, + unsigned int address, + unsigned char *byte) +{ + int ret; + struct mmc_command io_cmd; + + memset(&io_cmd, 0, sizeof(io_cmd)); + ath10k_sdio_set_cmd52_arg(&io_cmd.arg, 0, 0, address, 0); + io_cmd.opcode = SD_IO_RW_DIRECT; + io_cmd.flags = MMC_RSP_R5 | MMC_CMD_AC; + + ret = mmc_wait_for_cmd(card->host, &io_cmd, 0); + if (!ret) + *byte = io_cmd.resp[0]; + + return ret; +} + +static int ath10k_sdio_io(struct ath10k_sdio *ar_sdio, u32 request, u32 addr, + u8 *buf, u32 len) +{ + int ret = 0; + struct sdio_func *func = ar_sdio->func; + struct ath10k *ar = ar_sdio->ar; + + sdio_claim_host(func); + + if (request & HIF_WRITE) { + if (request & HIF_FIXED_ADDRESS) + ret = sdio_writesb(func, addr, buf, len); + else + ret = sdio_memcpy_toio(func, addr, buf, len); + } else { + if (request & HIF_FIXED_ADDRESS) + ret = sdio_readsb(func, buf, addr, len); + else + ret = sdio_memcpy_fromio(func, buf, addr, len); + } + + sdio_release_host(func); + + ath10k_dbg(ar, ATH10K_DBG_SDIO, "%s addr 0x%x%s buf 0x%p len %d\n", + request & HIF_WRITE ? "wr" : "rd", addr, + request & HIF_FIXED_ADDRESS ? " (fixed)" : "", buf, len); + ath10k_dbg_dump(ar, ATH10K_DBG_SDIO_DUMP, NULL, + request & HIF_WRITE ? "sdio wr " : "sdio rd ", + buf, len); + + return ret; +} + +static struct ath10k_sdio_bus_request +*ath10k_sdio_alloc_busreq(struct ath10k_sdio *ar_sdio) +{ + struct ath10k_sdio_bus_request *bus_req; + + spin_lock_bh(&ar_sdio->lock); + + if (list_empty(&ar_sdio->bus_req_freeq)) { + spin_unlock_bh(&ar_sdio->lock); + return NULL; + } + + bus_req = list_first_entry(&ar_sdio->bus_req_freeq, + struct ath10k_sdio_bus_request, list); + list_del(&bus_req->list); + + spin_unlock_bh(&ar_sdio->lock); + + return bus_req; +} + +static void ath10k_sdio_free_bus_req(struct ath10k_sdio *ar_sdio, + struct ath10k_sdio_bus_request *bus_req) +{ + spin_lock_bh(&ar_sdio->lock); + list_add_tail(&bus_req->list, &ar_sdio->bus_req_freeq); + spin_unlock_bh(&ar_sdio->lock); +} + +static int ath10k_sdio_read_write_sync(struct ath10k *ar, u32 addr, u8 *buf, + u32 len, u32 request) +{ + struct ath10k_sdio *ar_sdio = ath10k_sdio_priv(ar); + u8 *tbuf = NULL; + int ret; + bool bounced = false; + + if (request & HIF_BLOCK_BASIS) + len = round_down(len, ar_sdio->mbox_info.block_size); + + if (buf_needs_bounce(buf)) { + if (!ar_sdio->dma_buffer) + return -ENOMEM; + /* FIXME: I am not sure if it is always correct to assume + * that the SDIO irq is a "fake" irq and sleep is possible. + * (this function will get called from + * ath10k_sdio_irq_handler + */ + mutex_lock(&ar_sdio->dma_buffer_mutex); + tbuf = ar_sdio->dma_buffer; + + if (request & HIF_WRITE) + memcpy(tbuf, buf, len); + + bounced = true; + } else { + tbuf = buf; + } + + ret = ath10k_sdio_io(ar_sdio, request, addr, tbuf, len); + if ((request & HIF_READ) && bounced) + memcpy(buf, tbuf, len); + + if (bounced) + mutex_unlock(&ar_sdio->dma_buffer_mutex); + + return ret; +} + +static void __ath10k_sdio_write_async(struct ath10k_sdio *ar_sdio, + struct ath10k_sdio_bus_request *req) +{ + int status; + struct ath10k_htc_ep *ep; + struct sk_buff *skb; + + skb = req->skb; + status = ath10k_sdio_read_write_sync(ar_sdio->ar, req->address, + skb->data, req->len, + req->request); + ep = &ar_sdio->ar->htc.endpoint[req->eid]; + ath10k_htc_notify_tx_completion(ep, skb); + ath10k_sdio_free_bus_req(ar_sdio, req); +} + +static void ath10k_sdio_write_async_work(struct work_struct *work) +{ + struct ath10k_sdio *ar_sdio; + struct ath10k_sdio_bus_request *req, *tmp_req; + + ar_sdio = container_of(work, struct ath10k_sdio, wr_async_work); + + spin_lock_bh(&ar_sdio->wr_async_lock); + list_for_each_entry_safe(req, tmp_req, &ar_sdio->wr_asyncq, list) { + list_del(&req->list); + spin_unlock_bh(&ar_sdio->wr_async_lock); + __ath10k_sdio_write_async(ar_sdio, req); + spin_lock_bh(&ar_sdio->wr_async_lock); + } + spin_unlock_bh(&ar_sdio->wr_async_lock); +} + +static void ath10k_sdio_irq_handler(struct sdio_func *func) +{ + int status = 0; + unsigned long timeout; + struct ath10k_sdio *ar_sdio; + bool done = false; + + ar_sdio = sdio_get_drvdata(func); + atomic_set(&ar_sdio->irq_handling, 1); + + /* Release the host during interrupts so we can pick it back up when + * we process commands. + */ + sdio_release_host(ar_sdio->func); + + timeout = jiffies + ATH10K_SDIO_HIF_COMMUNICATION_TIMEOUT_HZ; + while (time_before(jiffies, timeout) && !done) { + status = ath10k_sdio_mbox_proc_pending_irqs(ar_sdio, &done); + if (status) + break; + } + + sdio_claim_host(ar_sdio->func); + + atomic_set(&ar_sdio->irq_handling, 0); + wake_up(&ar_sdio->irq_wq); + + WARN_ON(status && status != -ECANCELED); +} + +static int ath10k_sdio_hif_disable_intrs(struct ath10k_sdio *ar_sdio) +{ + int ret; + struct ath10k_sdio_irq_enable_reg regs; + struct ath10k_sdio_irq_data *irq_data = &ar_sdio->irq_data; + + memset(&regs, 0, sizeof(regs)); + + ret = ath10k_sdio_read_write_sync(ar_sdio->ar, + MBOX_INT_STATUS_ENABLE_ADDRESS, + &regs.int_status_en, sizeof(regs), + HIF_WR_SYNC_BYTE_INC); + if (ret) { + ath10k_err(ar_sdio->ar, "Unable to disable sdio interrupts\n"); + return ret; + } + + spin_lock_bh(&irq_data->lock); + irq_data->irq_en_reg = regs; + spin_unlock_bh(&irq_data->lock); + + return 0; +} + +static int ath10k_sdio_hif_power_up(struct ath10k *ar) +{ + struct ath10k_sdio *ar_sdio = ath10k_sdio_priv(ar); + struct sdio_func *func = ar_sdio->func; + int ret = 0; + + if (!ar_sdio->is_disabled) + return 0; + + ath10k_dbg(ar, ATH10K_DBG_BOOT, "sdio power on\n"); + + sdio_claim_host(func); + + ret = sdio_enable_func(func); + if (ret) { + ath10k_err(ar, "Unable to enable sdio func: %d)\n", ret); + sdio_release_host(func); + return ret; + } + + sdio_release_host(func); + + /* Wait for hardware to initialise. It should take a lot less than + * 20 ms but let's be conservative here. + */ + msleep(20); + + ar_sdio->is_disabled = false; + + ret = ath10k_sdio_hif_disable_intrs(ar_sdio); + + return ret; +} + +static void ath10k_sdio_hif_power_down(struct ath10k *ar) +{ + struct ath10k_sdio *ar_sdio = ath10k_sdio_priv(ar); + int ret; + + if (ar_sdio->is_disabled) + return; + + ath10k_dbg(ar, ATH10K_DBG_BOOT, "sdio power off\n"); + + /* Disable the card */ + sdio_claim_host(ar_sdio->func); + ret = sdio_disable_func(ar_sdio->func); + sdio_release_host(ar_sdio->func); + + if (ret) + ath10k_dbg(ar, ATH10K_DBG_BOOT, + "Unable to disable sdio: %d\n", ret); + + ar_sdio->is_disabled = true; +} + +int ath10k_sdio_hif_tx_sg(struct ath10k *ar, u8 pipe_id, + struct ath10k_hif_sg_item *items, int n_items) +{ + int i; + u32 address; + struct ath10k_sdio *ar_sdio = ath10k_sdio_priv(ar); + struct ath10k_sdio_bus_request *bus_req; + + bus_req = ath10k_sdio_alloc_busreq(ar_sdio); + + if (WARN_ON_ONCE(!bus_req)) + return -ENOMEM; + + for (i = 0; i < n_items; i++) { + bus_req->skb = items[i].transfer_context; + bus_req->request = HIF_WRITE; + bus_req->eid = pipe_id_to_eid(pipe_id); + /* Write TX data to the end of the mbox address space */ + address = ar_sdio->mbox_addr[bus_req->eid] + + ar_sdio->mbox_size[bus_req->eid] - bus_req->skb->len; + bus_req->address = address; + bus_req->len = CALC_TXRX_PADDED_LEN(ar_sdio, bus_req->skb->len); + + spin_lock_bh(&ar_sdio->wr_async_lock); + list_add_tail(&bus_req->list, &ar_sdio->wr_asyncq); + spin_unlock_bh(&ar_sdio->wr_async_lock); + } + + queue_work(ar_sdio->workqueue, &ar_sdio->wr_async_work); + + return 0; +} + +static int ath10k_sdio_hif_enable_intrs(struct ath10k_sdio *ar_sdio) +{ + struct ath10k_sdio_irq_enable_reg regs; + int status; + struct ath10k_sdio_irq_data *irq_data = &ar_sdio->irq_data; + + memset(&regs, 0, sizeof(regs)); + + /* Enable all but CPU interrupts */ + regs.int_status_en = SM(0x01, MBOX_INT_STATUS_ENABLE_ERROR) | + SM(0x01, MBOX_INT_STATUS_ENABLE_CPU) | + SM(0x01, MBOX_INT_STATUS_ENABLE_COUNTER); + + /* NOTE: There are some cases where HIF can do detection of + * pending mbox messages which is disabled now. + */ + regs.int_status_en |= SM(0x01, MBOX_INT_STATUS_ENABLE_MBOX_DATA); + + /* Set up the CPU Interrupt status Register */ + regs.cpu_int_status_en = 0; + + /* Set up the Error Interrupt status Register */ + regs.err_int_status_en = + SM(0x01, MBOX_ERROR_STATUS_ENABLE_RX_UNDERFLOW) | + SM(0x01, MBOX_ERROR_STATUS_ENABLE_TX_OVERFLOW); + + /* Enable Counter interrupt status register to get fatal errors for + * debugging. + */ + regs.cntr_int_status_en = SM(ATH10K_SDIO_TARGET_DEBUG_INTR_MASK, + MBOX_COUNTER_INT_STATUS_ENABLE_BIT); + + status = ath10k_sdio_read_write_sync(ar_sdio->ar, + MBOX_INT_STATUS_ENABLE_ADDRESS, + &regs.int_status_en, sizeof(regs), + HIF_WR_SYNC_BYTE_INC); + if (status) { + ath10k_err(ar_sdio->ar, + "failed to update interrupt ctl reg err: %d\n", + status); + return status; + } + + spin_lock_bh(&irq_data->lock); + irq_data->irq_en_reg = regs; + spin_unlock_bh(&irq_data->lock); + + return 0; +} + +static int ath10k_sdio_hif_start(struct ath10k *ar) +{ + int ret; + struct ath10k_sdio *ar_sdio = ath10k_sdio_priv(ar); + u32 addr, val; + + addr = host_interest_item_address(HI_ITEM(hi_acs_flags)); + + ret = ath10k_sdio_hif_diag_read32(ar, addr, &val); + if (ret) { + ath10k_err(ar, "Unable to read diag mem: %d\n", ret); + goto out; + } + + if (val & HI_ACS_FLAGS_SDIO_SWAP_MAILBOX_FW_ACK) { + ath10k_dbg(ar, ATH10K_DBG_SDIO, + "Mailbox SWAP Service is enabled\n"); + ar_sdio->swap_mbox = true; + } + + /* eid 0 always uses the lower part of the extended mailbox address + * space (ext_info[0].htc_ext_addr). + */ + ar_sdio->mbox_addr[0] = ar_sdio->mbox_info.ext_info[0].htc_ext_addr; + ar_sdio->mbox_size[0] = ar_sdio->mbox_info.ext_info[0].htc_ext_sz; + + sdio_claim_host(ar_sdio->func); + + /* Register the isr */ + ret = sdio_claim_irq(ar_sdio->func, ath10k_sdio_irq_handler); + if (ret) { + ath10k_err(ar, "Failed to claim sdio irq: %d\n", ret); + sdio_release_host(ar_sdio->func); + goto out; + } + + sdio_release_host(ar_sdio->func); + + ret = ath10k_sdio_hif_enable_intrs(ar_sdio); + if (ret) + ath10k_err(ar, "Failed to enable sdio interrupts: %d\n", ret); + +out: + return ret; +} + +static bool ath10k_sdio_is_on_irq(struct ath10k *ar) +{ + struct ath10k_sdio *ar_sdio = ath10k_sdio_priv(ar); + + return !atomic_read(&ar_sdio->irq_handling); +} + +static void ath10k_sdio_irq_disable(struct ath10k *ar) +{ + struct ath10k_sdio *ar_sdio = ath10k_sdio_priv(ar); + int ret; + + sdio_claim_host(ar_sdio->func); + + atomic_set(&ar_sdio->stopping, 1); + + if (atomic_read(&ar_sdio->irq_handling)) { + sdio_release_host(ar_sdio->func); + + ret = wait_event_interruptible(ar_sdio->irq_wq, + ath10k_sdio_is_on_irq(ar)); + if (ret) + return; + + sdio_claim_host(ar_sdio->func); + } + + ret = sdio_release_irq(ar_sdio->func); + if (ret) + ath10k_err(ar, "Failed to release sdio irq: %d\n", ret); + + sdio_release_host(ar_sdio->func); +} + +static int ath10k_sdio_config(struct ath10k_sdio *ar_sdio) +{ + struct ath10k *ar = ar_sdio->ar; + struct sdio_func *func = ar_sdio->func; + unsigned char byte, asyncintdelay = 2; + int ret; + + ath10k_dbg(ar, ATH10K_DBG_BOOT, "SDIO configuration\n"); + + sdio_claim_host(func); + + byte = 0; + ret = ath10k_sdio_func0_cmd52_rd_byte(func->card, + SDIO_CCCR_DRIVE_STRENGTH, + &byte); + + byte = (byte & (~(SDIO_DRIVE_DTSx_MASK << SDIO_DRIVE_DTSx_SHIFT))) | + SDIO_DTSx_SET_TYPE_D; + + ret = ath10k_sdio_func0_cmd52_wr_byte(func->card, + SDIO_CCCR_DRIVE_STRENGTH, + byte); + + byte = 0; + ret = ath10k_sdio_func0_cmd52_rd_byte( + func->card, + CCCR_SDIO_DRIVER_STRENGTH_ENABLE_ADDR, + &byte); + + byte |= (CCCR_SDIO_DRIVER_STRENGTH_ENABLE_A | + CCCR_SDIO_DRIVER_STRENGTH_ENABLE_C | + CCCR_SDIO_DRIVER_STRENGTH_ENABLE_D); + + ret = ath10k_sdio_func0_cmd52_wr_byte( + func->card, + CCCR_SDIO_DRIVER_STRENGTH_ENABLE_ADDR, + byte); + if (ret) { + ath10k_err(ar, "Failed to enable driver strengt\n"); + goto out; + } + + byte = 0; + ret = ath10k_sdio_func0_cmd52_rd_byte(func->card, + CCCR_SDIO_IRQ_MODE_REG_SDIO3, + &byte); + + byte |= SDIO_IRQ_MODE_ASYNC_4BIT_IRQ_SDIO3; + + ret = ath10k_sdio_func0_cmd52_wr_byte(func->card, + CCCR_SDIO_IRQ_MODE_REG_SDIO3, + byte); + if (ret) { + ath10k_err(ar, "Failed to enable 4-bit async irq mode %d\n", + ret); + goto out; + } + + byte = 0; + ret = ath10k_sdio_func0_cmd52_rd_byte(func->card, + CCCR_SDIO_ASYNC_INT_DELAY_ADDRESS, + &byte); + + byte = (byte & ~CCCR_SDIO_ASYNC_INT_DELAY_MASK) | + ((asyncintdelay << CCCR_SDIO_ASYNC_INT_DELAY_LSB) & + CCCR_SDIO_ASYNC_INT_DELAY_MASK); + + ret = ath10k_sdio_func0_cmd52_wr_byte(func->card, + CCCR_SDIO_ASYNC_INT_DELAY_ADDRESS, + byte); + + /* give us some time to enable, in ms */ + func->enable_timeout = 100; + + ret = sdio_set_block_size(func, ar_sdio->mbox_info.block_size); + if (ret) { + ath10k_err(ar, "Set sdio block size %d failed: %d)\n", + ar_sdio->mbox_info.block_size, ret); + goto out; + } + +out: + sdio_release_host(func); + + return ret; +} + +/* set the window address register (using 4-byte register access ). */ +static int ath10k_set_addrwin_reg(struct ath10k *ar, u32 reg_addr, u32 addr) +{ + int status; + + status = ath10k_sdio_read_write_sync(ar, reg_addr, (u8 *)(&addr), + 4, HIF_WR_SYNC_BYTE_INC); + + if (status) { + ath10k_err(ar, "%s: failed to write 0x%x to window reg: 0x%X\n", + __func__, addr, reg_addr); + return status; + } + + return 0; +} + +static int ath10k_sdio_hif_diag_read32(struct ath10k *ar, u32 address, + u32 *value) +{ + __le32 val = 0; + int ret; + + ret = ath10k_sdio_hif_diag_read(ar, address, &val, sizeof(val)); + *value = __le32_to_cpu(val); + + return ret; +} + +static int ath10k_sdio_hif_diag_read(struct ath10k *ar, u32 address, void *buf, + size_t buf_len) +{ + int status; + + /* set window register to start read cycle */ + status = ath10k_set_addrwin_reg(ar, MBOX_WINDOW_READ_ADDR_ADDRESS, + address); + + if (status) + return status; + + /* read the data */ + status = ath10k_sdio_read_write_sync(ar, MBOX_WINDOW_DATA_ADDRESS, + (u8 *)buf, buf_len, + HIF_RD_SYNC_BYTE_INC); + if (status) { + ath10k_err(ar, "%s: failed to read from window data addr\n", + __func__); + return status; + } + + return status; +} + +static int ath10k_sdio_diag_write_mem(struct ath10k *ar, u32 address, + const void *data, int nbytes) +{ + int status; + + /* set write data */ + status = ath10k_sdio_read_write_sync(ar, MBOX_WINDOW_DATA_ADDRESS, + (u8 *)data, nbytes, + HIF_WR_SYNC_BYTE_INC); + if (status) { + ath10k_err(ar, "%s: failed to write 0x%p to window data addr\n", + __func__, data); + return status; + } + + /* set window register, which starts the write cycle */ + return ath10k_set_addrwin_reg(ar, MBOX_WINDOW_WRITE_ADDR_ADDRESS, + address); +} + +static int ath10k_sdio_bmi_credits(struct ath10k *ar) +{ + u32 addr, cmd_credits; + unsigned long timeout; + int ret; + + cmd_credits = 0; + + /* Read the counter register to get the command credits */ + addr = MBOX_COUNT_DEC_ADDRESS + ATH10K_HIF_MBOX_NUM_MAX * 4; + + timeout = jiffies + BMI_COMMUNICATION_TIMEOUT_HZ; + while (time_before(jiffies, timeout) && !cmd_credits) { + /* Hit the credit counter with a 4-byte access, the first byte + * read will hit the counter and cause a decrement, while the + * remaining 3 bytes has no effect. The rationale behind this + * is to make all HIF accesses 4-byte aligned. + */ + ret = ath10k_sdio_read_write_sync(ar, addr, + (u8 *)&cmd_credits, + sizeof(cmd_credits), + HIF_RD_SYNC_BYTE_INC); + if (ret) { + ath10k_err(ar, + "Unable to decrement the command credit count register: %d\n", + ret); + return ret; + } + + /* The counter is only 8 bits. + * Ignore anything in the upper 3 bytes + */ + cmd_credits &= 0xFF; + } + + if (!cmd_credits) { + ath10k_err(ar, "bmi communication timeout\n"); + return -ETIMEDOUT; + } + + return 0; +} + +static int ath10k_sdio_bmi_get_rx_lookahead(struct ath10k *ar) +{ + unsigned long timeout; + u32 rx_word = 0; + int ret = 0; + + timeout = jiffies + BMI_COMMUNICATION_TIMEOUT_HZ; + while ((time_before(jiffies, timeout)) && !rx_word) { + ret = ath10k_sdio_read_write_sync(ar, + MBOX_HOST_INT_STATUS_ADDRESS, + (u8 *)&rx_word, + sizeof(rx_word), + HIF_RD_SYNC_BYTE_INC); + if (ret) { + ath10k_err(ar, "unable to read RX_LOOKAHEAD_VALID\n"); + return ret; + } + + /* all we really want is one bit */ + rx_word &= 1; + } + + if (!rx_word) { + ath10k_err(ar, "bmi_recv_buf FIFO empty\n"); + return -EINVAL; + } + + return ret; +} + +int ath10k_sdio_hif_exchange_bmi_msg(struct ath10k *ar, + void *req, u32 req_len, + void *resp, u32 *resp_len) +{ + int ret = 0; + u32 addr; + struct ath10k_sdio *ar_sdio = ath10k_sdio_priv(ar); + + ret = ath10k_sdio_bmi_credits(ar); + if (ret) + return ret; + + /* BMI data is written to the end of the mailbox address space */ + addr = ar_sdio->mbox_info.htc_addr + ATH10K_HIF_MBOX_WIDTH - req_len; + + ret = ath10k_sdio_read_write_sync(ar, addr, req, req_len, + HIF_WR_SYNC_BYTE_INC); + if (ret) { + ath10k_err(ar, "unable to send the bmi data to the device\n"); + return ret; + } + + if (!resp || !resp_len) + /* No response expected */ + goto out; + + /* During normal bootup, small reads may be required. + * Rather than issue an HIF Read and then wait as the Target + * adds successive bytes to the FIFO, we wait here until + * we know that response data is available. + * + * This allows us to cleanly timeout on an unexpected + * Target failure rather than risk problems at the HIF level. + * In particular, this avoids SDIO timeouts and possibly garbage + * data on some host controllers. And on an interconnect + * such as Compact Flash (as well as some SDIO masters) which + * does not provide any indication on data timeout, it avoids + * a potential hang or garbage response. + * + * Synchronization is more difficult for reads larger than the + * size of the MBOX FIFO (128B), because the Target is unable + * to push the 129th byte of data until AFTER the Host posts an + * HIF Read and removes some FIFO data. So for large reads the + * Host proceeds to post an HIF Read BEFORE all the data is + * actually available to read. Fortunately, large BMI reads do + * not occur in practice -- they're supported for debug/development. + * + * So Host/Target BMI synchronization is divided into these cases: + * CASE 1: length < 4 + * Should not happen + * + * CASE 2: 4 <= length <= 128 + * Wait for first 4 bytes to be in FIFO + * If CONSERVATIVE_BMI_READ is enabled, also wait for + * a BMI command credit, which indicates that the ENTIRE + * response is available in the the FIFO + * + * CASE 3: length > 128 + * Wait for the first 4 bytes to be in FIFO + * + * For most uses, a small timeout should be sufficient and we will + * usually see a response quickly; but there may be some unusual + * (debug) cases of BMI_EXECUTE where we want an larger timeout. + * For now, we use an unbounded busy loop while waiting for + * BMI_EXECUTE. + * + * If BMI_EXECUTE ever needs to support longer-latency execution, + * especially in production, this code needs to be enhanced to sleep + * and yield. Also note that BMI_COMMUNICATION_TIMEOUT is currently + * a function of Host processor speed. + */ + ret = ath10k_sdio_bmi_get_rx_lookahead(ar); + if (ret) + goto out; + + /* We always read from the start of the mbox address */ + addr = ar_sdio->mbox_info.htc_addr; + ret = ath10k_sdio_read_write_sync(ar, addr, resp, *resp_len, + HIF_RD_SYNC_BYTE_INC); + if (ret) + ath10k_err(ar, "Unable to read the bmi data from the device: %d\n", + ret); + +out: + return ret; +} + +static void ath10k_sdio_hif_stop(struct ath10k *ar) +{ + struct ath10k_sdio *ar_sdio = ath10k_sdio_priv(ar); + struct ath10k_sdio_bus_request *req, *tmp_req; + + ath10k_sdio_irq_disable(ar); + + cancel_work_sync(&ar_sdio->wr_async_work); + + spin_lock_bh(&ar_sdio->wr_async_lock); + + list_for_each_entry_safe(req, tmp_req, &ar_sdio->wr_asyncq, list) { + struct ath10k_htc_ep *ep; + + list_del(&req->list); + + ep = &ar->htc.endpoint[req->eid]; + ath10k_htc_notify_tx_completion(ep, req->skb); + ath10k_sdio_free_bus_req(ar_sdio, req); + } + + spin_unlock_bh(&ar_sdio->wr_async_lock); +} + +#ifdef CONFIG_PM + +static int ath10k_sdio_hif_suspend(struct ath10k *ar) +{ + return -EOPNOTSUPP; +} + +static int ath10k_sdio_hif_resume(struct ath10k *ar) +{ + struct ath10k_sdio *ar_sdio = ath10k_sdio_priv(ar); + + switch (ar->state) { + case ATH10K_STATE_OFF: + ath10k_dbg(ar, ATH10K_DBG_SDIO, + "sdio resume configuring sdio\n"); + + /* need to set sdio settings after power is cut from sdio */ + ath10k_sdio_config(ar_sdio); + break; + + case ATH10K_STATE_ON: + default: + break; + } + + return 0; +} +#endif + +int ath10k_sdio_hif_map_service_to_pipe(struct ath10k *ar, u16 service_id, + u8 *ul_pipe, u8 *dl_pipe) +{ + int ret = 0, i; + bool ep_found = false; + enum ath10k_htc_ep_id eid; + struct ath10k_htc *htc = &ar->htc; + struct ath10k_sdio *ar_sdio = ath10k_sdio_priv(ar); + u32 htt_addr, wmi_addr, htt_mbox_size, wmi_mbox_size; + + /* For sdio, we are interested in the mapping between eid + * and pipeid rather than service_id to pipe_id. + * First we find out which eid has been allocated to the + * service... + */ + for (i = 0; i < ATH10K_HTC_EP_COUNT; i++) { + if (htc->endpoint[i].service_id == service_id) { + eid = htc->endpoint[i].eid; + ep_found = true; + break; + } + } + + if (!ep_found) { + ret = -EINVAL; + goto out; + } + + /* Then we create the simplest mapping possible between pipeid + * and eid + */ + *ul_pipe = *dl_pipe = (u8)eid; + + /* Normally, HTT will use the upper part of the extended + * mailbox address space (ext_info[1].htc_ext_addr) and WMI ctrl + * the lower part (ext_info[0].htc_ext_addr). + * If fw wants swapping of mailbox addresses, the opposite is true. + */ + if (ar_sdio->swap_mbox) { + htt_addr = ar_sdio->mbox_info.ext_info[0].htc_ext_addr; + wmi_addr = ar_sdio->mbox_info.ext_info[1].htc_ext_addr; + htt_mbox_size = ar_sdio->mbox_info.ext_info[0].htc_ext_sz; + wmi_mbox_size = ar_sdio->mbox_info.ext_info[1].htc_ext_sz; + } else { + htt_addr = ar_sdio->mbox_info.ext_info[1].htc_ext_addr; + wmi_addr = ar_sdio->mbox_info.ext_info[0].htc_ext_addr; + htt_mbox_size = ar_sdio->mbox_info.ext_info[1].htc_ext_sz; + wmi_mbox_size = ar_sdio->mbox_info.ext_info[0].htc_ext_sz; + } + + switch (service_id) { + case ATH10K_HTC_SVC_ID_RSVD_CTRL: + /* HTC ctrl ep mbox address has already been setup in + * ath10k_sdio_hif_start + */ + break; + case ATH10K_HTC_SVC_ID_WMI_CONTROL: + ar_sdio->mbox_addr[eid] = wmi_addr; + ar_sdio->mbox_size[eid] = wmi_mbox_size; + ath10k_dbg(ar, ATH10K_DBG_SDIO, + "WMI ctrl mbox addr = %x, mbox_size = %x\n", + ar_sdio->mbox_addr[eid], ar_sdio->mbox_size[eid]); + break; + case ATH10K_HTC_SVC_ID_HTT_DATA_MSG: + ar_sdio->mbox_addr[eid] = htt_addr; + ar_sdio->mbox_size[eid] = htt_mbox_size; + ath10k_dbg(ar, ATH10K_DBG_SDIO, + "HTT data mbox addr = %x, mbox_size = %x\n", + ar_sdio->mbox_addr[eid], ar_sdio->mbox_size[eid]); + break; + default: + ath10k_err(ar, "Unsupported service ID: %x\n", + service_id); + ret = -EINVAL; + } + +out: + return ret; +} + +void ath10k_sdio_hif_get_default_pipe(struct ath10k *ar, + u8 *ul_pipe, u8 *dl_pipe) +{ + ath10k_dbg(ar, ATH10K_DBG_SDIO, "sdio hif get default pipe\n"); + + /* HTC ctrl ep (SVC id 1) always has eid (and pipe_id in our + * case) == 0 + */ + *ul_pipe = 0; + *dl_pipe = 0; +} + +static int ath10k_sdio_hif_fetch_cal_eeprom(struct ath10k *ar, void **data, + size_t *data_len) +{ + return -EOPNOTSUPP; +} + +static void ath10k_sdio_write32(struct ath10k *ar, u32 offset, u32 value) +{ +} + +static u32 ath10k_sdio_read32(struct ath10k *ar, u32 offset) +{ + return 0; +} + +static void ath10k_sdio_hif_send_complete_check(struct ath10k *ar, + u8 pipe, int force) +{ +} + +static u16 ath10k_sdio_hif_get_free_queue_number(struct ath10k *ar, u8 pipe) +{ + return 0; +} + +static const struct ath10k_hif_ops ath10k_sdio_hif_ops = { + .tx_sg = ath10k_sdio_hif_tx_sg, + .diag_read = ath10k_sdio_hif_diag_read, + .diag_write = ath10k_sdio_diag_write_mem, + .exchange_bmi_msg = ath10k_sdio_hif_exchange_bmi_msg, + .start = ath10k_sdio_hif_start, + .stop = ath10k_sdio_hif_stop, + .map_service_to_pipe = ath10k_sdio_hif_map_service_to_pipe, + .get_default_pipe = ath10k_sdio_hif_get_default_pipe, + .send_complete_check = ath10k_sdio_hif_send_complete_check, + .get_free_queue_number = ath10k_sdio_hif_get_free_queue_number, + .power_up = ath10k_sdio_hif_power_up, + .power_down = ath10k_sdio_hif_power_down, + .read32 = ath10k_sdio_read32, + .write32 = ath10k_sdio_write32, +#ifdef CONFIG_PM + .suspend = ath10k_sdio_hif_suspend, + .resume = ath10k_sdio_hif_resume, +#endif + .fetch_cal_eeprom = ath10k_sdio_hif_fetch_cal_eeprom, +}; + +#ifdef CONFIG_PM_SLEEP + +/* Empty handlers so that mmc subsystem doesn't remove us entirely during + * suspend. We instead follow cfg80211 suspend/resume handlers. + */ +static int ath10k_sdio_pm_suspend(struct device *device) +{ + return 0; +} + +static int ath10k_sdio_pm_resume(struct device *device) +{ + return 0; +} + +static SIMPLE_DEV_PM_OPS(ath10k_sdio_pm_ops, ath10k_sdio_pm_suspend, + ath10k_sdio_pm_resume); + +#define ATH10K_SDIO_PM_OPS (&ath10k_sdio_pm_ops) + +#else + +#define ATH10K_SDIO_PM_OPS NULL + +#endif /* CONFIG_PM_SLEEP */ + +static int ath10k_sdio_probe(struct sdio_func *func, + const struct sdio_device_id *id) +{ + int ret; + struct ath10k_sdio *ar_sdio; + struct ath10k *ar; + int i; + enum ath10k_hw_rev hw_rev; + + hw_rev = ATH10K_HW_QCA6174; + + ar = ath10k_core_create(sizeof(*ar_sdio), &func->dev, ATH10K_BUS_SDIO, + hw_rev, &ath10k_sdio_hif_ops); + if (!ar) { + dev_err(&func->dev, "failed to allocate core\n"); + return -ENOMEM; + } + + ath10k_dbg(ar, ATH10K_DBG_BOOT, + "sdio new func %d vendor 0x%x device 0x%x block 0x%x/0x%x\n", + func->num, func->vendor, func->device, + func->max_blksize, func->cur_blksize); + + ar_sdio = ath10k_sdio_priv(ar); + + ar_sdio->dma_buffer = kzalloc(ATH10K_HIF_DMA_BUFFER_SIZE, GFP_KERNEL); + if (!ar_sdio->dma_buffer) { + ret = -ENOMEM; + goto err_core_destroy; + } + + ar_sdio->func = func; + sdio_set_drvdata(func, ar_sdio); + + ar_sdio->is_disabled = true; + ar_sdio->ar = ar; + + spin_lock_init(&ar_sdio->lock); + spin_lock_init(&ar_sdio->wr_async_lock); + spin_lock_init(&ar_sdio->irq_data.lock); + mutex_init(&ar_sdio->dma_buffer_mutex); + + INIT_LIST_HEAD(&ar_sdio->bus_req_freeq); + INIT_LIST_HEAD(&ar_sdio->wr_asyncq); + + INIT_WORK(&ar_sdio->wr_async_work, ath10k_sdio_write_async_work); + ar_sdio->workqueue = create_singlethread_workqueue("ath10k_sdio_wq"); + if (!ar_sdio->workqueue) + goto err; + + init_waitqueue_head(&ar_sdio->irq_wq); + + for (i = 0; i < ATH10K_SDIO_BUS_REQUEST_MAX_NUM; i++) + ath10k_sdio_free_bus_req(ar_sdio, &ar_sdio->bus_req[i]); + + ar->dev_id = id->device; + ar->id.vendor = id->vendor; + ar->id.device = id->device; + + ath10k_sdio_set_mbox_info(ar_sdio); + + ret = ath10k_sdio_config(ar_sdio); + if (ret) { + ath10k_err(ar, "Failed to config sdio: %d\n", ret); + goto err; + } + + ret = ath10k_core_register(ar, 0/*chip_id is not applicaple for SDIO*/); + if (ret) { + ath10k_err(ar, "failed to register driver core: %d\n", ret); + goto err; + } + + return ret; + +err: + kfree(ar_sdio->dma_buffer); +err_core_destroy: + ath10k_core_destroy(ar); + + return ret; +} + +static void ath10k_sdio_remove(struct sdio_func *func) +{ + struct ath10k_sdio *ar_sdio; + struct ath10k *ar; + + ar_sdio = sdio_get_drvdata(func); + ar = ar_sdio->ar; + + ath10k_dbg(ar, ATH10K_DBG_BOOT, + "sdio removed func %d vendor 0x%x device 0x%x\n", + func->num, func->vendor, func->device); + + (void)ath10k_sdio_hif_disable_intrs(ar_sdio); + cancel_work_sync(&ar_sdio->wr_async_work); + ath10k_core_unregister(ar); + ath10k_core_destroy(ar); + + kfree(ar_sdio->dma_buffer); +} + +static const struct sdio_device_id ath10k_sdio_devices[] = { + {SDIO_DEVICE(ATH10K_MANUFACTURER_CODE, + (ATH10K_MANUFACTURER_ID_AR6005_BASE | 0xA))}, + {}, +}; + +MODULE_DEVICE_TABLE(sdio, ath10k_sdio_devices); + +static struct sdio_driver ath10k_sdio_driver = { + .name = "ath10k_sdio", + .id_table = ath10k_sdio_devices, + .probe = ath10k_sdio_probe, + .remove = ath10k_sdio_remove, + .drv.pm = ATH10K_SDIO_PM_OPS, +}; + +static int __init ath10k_sdio_init(void) +{ + int ret; + + ret = sdio_register_driver(&ath10k_sdio_driver); + if (ret) + pr_err("sdio driver registration failed: %d\n", ret); + + return ret; +} + +static void __exit ath10k_sdio_exit(void) +{ + sdio_unregister_driver(&ath10k_sdio_driver); +} + +module_init(ath10k_sdio_init); +module_exit(ath10k_sdio_exit); + +MODULE_AUTHOR("Qualcomm Atheros"); +MODULE_DESCRIPTION("Driver support for Qualcomm Atheros 802.11ac WLAN SDIO devices"); +MODULE_LICENSE("Dual BSD/GPL"); diff --git a/drivers/net/wireless/ath/ath10k/sdio.h b/drivers/net/wireless/ath/ath10k/sdio.h new file mode 100644 index 0000000..b5887c1 --- /dev/null +++ b/drivers/net/wireless/ath/ath10k/sdio.h @@ -0,0 +1,276 @@ +/* + * Copyright (c) 2004-2011 Atheros Communications Inc. + * Copyright (c) 2011-2012 Qualcomm Atheros, Inc. + * Copyright (c) 2016 Kapsch Trafficcom AB + * + * Permission to use, copy, modify, and/or distribute this software for any + * purpose with or without fee is hereby granted, provided that the above + * copyright notice and this permission notice appear in all copies. + * + * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES + * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR + * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES + * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN + * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF + * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. + */ + +#ifndef _SDIO_H_ +#define _SDIO_H_ + +#define ATH10K_HIF_MBOX_BLOCK_SIZE 256 +#define ATH10K_MANUFACTURER_ID_AR6005_BASE 0x500 + +#define ATH10K_MANUFACTURER_ID_REV_MASK 0x00FF +#define ATH10K_MANUFACTURER_CODE 0x271 /* Atheros */ + +#define ATH10K_HIF_DMA_BUFFER_SIZE (32 * 1024) +#define ATH10K_SDIO_MAX_BUFFER_SIZE 4096 /*Unsure of this constant*/ + +/* Mailbox address in SDIO address space */ +#define ATH10K_HIF_MBOX_BASE_ADDR 0x1000 +#define ATH10K_HIF_MBOX_WIDTH 0x800 + +#define ATH10K_HIF_MBOX_TOT_WIDTH \ + (ATH10K_HIF_MBOX_NUM_MAX * ATH10K_HIF_MBOX_WIDTH) + +#define ATH10K_HIF_MBOX0_EXT_BASE_ADDR 0x5000 +#define ATH10K_HIF_MBOX0_EXT_WIDTH (36 * 1024) +#define ATH10K_HIF_MBOX0_EXT_WIDTH_ROME_2_0 (56 * 1024) +#define ATH10K_HIF_MBOX1_EXT_WIDTH (36 * 1024) +#define ATH10K_HIF_MBOX_DUMMY_SPACE_SIZE (2 * 1024) + +#define ATH10K_HTC_MBOX_MAX_PAYLOAD_LENGTH \ + (ATH10K_SDIO_MAX_BUFFER_SIZE - sizeof(struct ath10k_htc_hdr)) + +#define ATH10K_HIF_MBOX_NUM_MAX 4 +#define ATH10K_SDIO_BUS_REQUEST_MAX_NUM 64 + +#define ATH10K_SDIO_HIF_COMMUNICATION_TIMEOUT_HZ (100 * HZ) + +/* HTC runs over mailbox 0 */ +#define ATH10K_HTC_MAILBOX 0 + +/* GMBOX addresses */ +#define ATH10K_HIF_GMBOX_BASE_ADDR 0x7000 +#define ATH10K_HIF_GMBOX_WIDTH 0x4000 + +/* interrupt mode register */ +#define CCCR_SDIO_IRQ_MODE_REG 0xF0 +#define CCCR_SDIO_IRQ_MODE_REG_SDIO3 0x16 + +#define CCCR_SDIO_DRIVER_STRENGTH_ENABLE_ADDR 0xF2 + +#define CCCR_SDIO_DRIVER_STRENGTH_ENABLE_A 0x02 +#define CCCR_SDIO_DRIVER_STRENGTH_ENABLE_C 0x04 +#define CCCR_SDIO_DRIVER_STRENGTH_ENABLE_D 0x08 + +#define CCCR_SDIO_ASYNC_INT_DELAY_ADDRESS 0xF0 +#define CCCR_SDIO_ASYNC_INT_DELAY_LSB 0x06 +#define CCCR_SDIO_ASYNC_INT_DELAY_MASK 0xC0 + +/* mode to enable special 4-bit interrupt assertion without clock */ +#define SDIO_IRQ_MODE_ASYNC_4BIT_IRQ BIT(0) +#define SDIO_IRQ_MODE_ASYNC_4BIT_IRQ_SDIO3 BIT(1) + +#define ATH10K_SDIO_TARGET_DEBUG_INTR_MASK 0x01 + +/* The theoretical maximum number of RX messages that can be fetched + * from the mbox interrupt handler in one loop is derived in the following + * way: + * + * Let's assume that each packet in a bundle of the maximum bundle size + * (HTC_HOST_MAX_MSG_PER_BUNDLE) has the HTC header bundle count set + * to the maximum value (HTC_HOST_MAX_MSG_PER_BUNDLE). + * + * in this case the driver must allocate + * (HTC_HOST_MAX_MSG_PER_BUNDLE * HTC_HOST_MAX_MSG_PER_BUNDLE) skb's. + */ +#define ATH10K_SDIO_MAX_RX_MSGS \ + (HTC_HOST_MAX_MSG_PER_BUNDLE * HTC_HOST_MAX_MSG_PER_BUNDLE) + +struct ath10k_sdio_bus_request { + struct list_head list; + + /* sdio address */ + u32 address; + u32 request; + size_t len; + struct sk_buff *skb; + enum ath10k_htc_ep_id eid; + int status; +}; + +struct ath10k_sdio_rx_data { + struct sk_buff *skb; + size_t alloc_len; + size_t act_len; + enum ath10k_htc_ep_id eid; + bool part_of_bundle; + bool last_in_bundle; + int status; +}; + +/* direction of transfer (read/write) */ +#define HIF_READ 0x00000001 +#define HIF_WRITE 0x00000002 +#define HIF_DIR_MASK (HIF_READ | HIF_WRITE) + +/* emode - This indicates the whether the command is to be executed in a + * blocking or non-blocking fashion (HIF_SYNCHRONOUS/ + * HIF_ASYNCHRONOUS). The read/write data paths in HTC have been + * implemented using the asynchronous mode allowing the the bus + * driver to indicate the completion of operation through the + * registered callback routine. The requirement primarily comes + * from the contexts these operations get called from (a driver's + * transmit context or the ISR context in case of receive). + * Support for both of these modes is essential. + */ +#define HIF_SYNCHRONOUS 0x00000010 +#define HIF_ASYNCHRONOUS 0x00000020 +#define HIF_EMODE_MASK (HIF_SYNCHRONOUS | HIF_ASYNCHRONOUS) + +/* dmode - An interface may support different kinds of commands based on + * the tradeoff between the amount of data it can carry and the + * setup time. Byte and Block modes are supported (HIF_BYTE_BASIS/ + * HIF_BLOCK_BASIS). In case of latter, the data is rounded off + * to the nearest block size by padding. The size of the block is + * configurable at compile time using the HIF_BLOCK_SIZE and is + * negotiated with the target during initialization after the + * ATH10K interrupts are enabled. + */ +#define HIF_BYTE_BASIS 0x00000040 +#define HIF_BLOCK_BASIS 0x00000080 +#define HIF_DMODE_MASK (HIF_BYTE_BASIS | HIF_BLOCK_BASIS) + +/* amode - This indicates if the address has to be incremented on ATH10K + * after every read/write operation (HIF?FIXED_ADDRESS/ + * HIF_INCREMENTAL_ADDRESS). + */ +#define HIF_FIXED_ADDRESS 0x00000100 +#define HIF_INCREMENTAL_ADDRESS 0x00000200 +#define HIF_AMODE_MASK (HIF_FIXED_ADDRESS | HIF_INCREMENTAL_ADDRESS) + +#define HIF_WR_ASYNC_BYTE_INC \ + (HIF_WRITE | HIF_ASYNCHRONOUS | \ + HIF_BYTE_BASIS | HIF_INCREMENTAL_ADDRESS) + +#define HIF_WR_ASYNC_BLOCK_INC \ + (HIF_WRITE | HIF_ASYNCHRONOUS | \ + HIF_BLOCK_BASIS | HIF_INCREMENTAL_ADDRESS) + +#define HIF_WR_SYNC_BYTE_FIX \ + (HIF_WRITE | HIF_SYNCHRONOUS | \ + HIF_BYTE_BASIS | HIF_FIXED_ADDRESS) + +#define HIF_WR_SYNC_BYTE_INC \ + (HIF_WRITE | HIF_SYNCHRONOUS | \ + HIF_BYTE_BASIS | HIF_INCREMENTAL_ADDRESS) + +#define HIF_WR_SYNC_BLOCK_INC \ + (HIF_WRITE | HIF_SYNCHRONOUS | \ + HIF_BLOCK_BASIS | HIF_INCREMENTAL_ADDRESS) + +#define HIF_RD_SYNC_BYTE_INC \ + (HIF_READ | HIF_SYNCHRONOUS | \ + HIF_BYTE_BASIS | HIF_INCREMENTAL_ADDRESS) + +#define HIF_RD_SYNC_BYTE_FIX \ + (HIF_READ | HIF_SYNCHRONOUS | \ + HIF_BYTE_BASIS | HIF_FIXED_ADDRESS) + +#define HIF_RD_ASYNC_BLOCK_FIX \ + (HIF_READ | HIF_ASYNCHRONOUS | \ + HIF_BLOCK_BASIS | HIF_FIXED_ADDRESS) + +#define HIF_RD_SYNC_BLOCK_FIX \ + (HIF_READ | HIF_SYNCHRONOUS | \ + HIF_BLOCK_BASIS | HIF_FIXED_ADDRESS) + +struct ath10k_sdio_irq_proc_registers { + u8 host_int_status; + u8 cpu_int_status; + u8 error_int_status; + u8 counter_int_status; + u8 mbox_frame; + u8 rx_lookahead_valid; + u8 host_int_status2; + u8 gmbox_rx_avail; + __le32 rx_lookahead[2]; + __le32 rx_gmbox_lookahead_alias[2]; +}; + +struct ath10k_sdio_irq_enable_reg { + u8 int_status_en; + u8 cpu_int_status_en; + u8 err_int_status_en; + u8 cntr_int_status_en; +}; + +struct ath10k_sdio_irq_data { + /* protects irq_proc_reg and irq_en_reg below */ + spinlock_t lock; + struct ath10k_sdio_irq_proc_registers irq_proc_reg; + struct ath10k_sdio_irq_enable_reg irq_en_reg; +}; + +struct ath10k_mbox_ext_info { + u32 htc_ext_addr; + u32 htc_ext_sz; +}; + +struct ath10k_mbox_info { + u32 htc_addr; + struct ath10k_mbox_ext_info ext_info[2]; + u32 block_size; + u32 block_mask; + u32 gmbox_addr; + u32 gmbox_sz; +}; + +struct ath10k_sdio { + struct sdio_func *func; + + struct ath10k_mbox_info mbox_info; + bool swap_mbox; + u32 mbox_addr[ATH10K_HTC_EP_COUNT]; + u32 mbox_size[ATH10K_HTC_EP_COUNT]; + + /* available bus requests */ + struct ath10k_sdio_bus_request bus_req[ATH10K_SDIO_BUS_REQUEST_MAX_NUM]; + /* free list of bus requests */ + struct list_head bus_req_freeq; + /* protects access to bus_req_freeq */ + spinlock_t lock; + + struct ath10k_sdio_rx_data rx_pkts[ATH10K_SDIO_MAX_RX_MSGS]; + size_t n_rx_pkts; + + struct ath10k *ar; + struct ath10k_sdio_irq_data irq_data; + + u8 *dma_buffer; + + /* protects access to dma_buffer */ + struct mutex dma_buffer_mutex; + + atomic_t irq_handling; + atomic_t stopping; + wait_queue_head_t irq_wq; + + bool is_disabled; + + struct workqueue_struct *workqueue; + struct work_struct wr_async_work; + struct list_head wr_asyncq; + /* protects access to wr_asyncq */ + spinlock_t wr_async_lock; +}; + +static inline struct ath10k_sdio *ath10k_sdio_priv(struct ath10k *ar) +{ + return (struct ath10k_sdio *)ar->drv_priv; +} + +#endif

[RFC,v2,11/11] ath10k: Added sdio support

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