| Message ID | 20220315032411.2826-5-leilk.liu@mediatek.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | spi: mediatek: add single/quad mode support | expand |
Il 15/03/22 04:24, Leilk Liu ha scritto: > this patch add the support of spi-mem for ipm design. > > Signed-off-by: Leilk Liu <leilk.liu@mediatek.com> > --- > drivers/spi/spi-mt65xx.c | 349 ++++++++++++++++++++++++++++++++++++++- > 1 file changed, 348 insertions(+), 1 deletion(-) > > diff --git a/drivers/spi/spi-mt65xx.c b/drivers/spi/spi-mt65xx.c > index 1a0b3208dfca..8958c3fa4fea 100644 > --- a/drivers/spi/spi-mt65xx.c > +++ b/drivers/spi/spi-mt65xx.c ...snip... > + > +static void of_mtk_spi_parse_dt(struct spi_master *master, struct device_node *nc) > +{ > + struct mtk_spi *mdata = spi_master_get_devdata(master); > + u32 value; > + > + if (!of_property_read_u32(nc, "spi-tx-bus-width", &value)) { Hello Leilk, thanks for considering my advice about "spi-{tx,rx}-bus-width", but there's something that you have misunderstood about it. Simply, you don't need this function at all. Whatever you are doing here is already being performed in the Linux SPI framework: at the end of the probe function, this driver is calling the (legacy) devm_spi_register_master(), which calls devm_spi_register_controller(). In drivers/spi/spi.c, function spi_register_controller(), will in turn call of_register_spi_devices(ctlr) -> of_register_spi_device(ctlr, nc)... that will end up finally calling function of_spi_parse_dt(ctlr, spi, nc). The last mentioned function already contains the logic and setup to check devicetree properties "spi-tx-bus-width" and "spi-rx-bus-width" (and some others, as well). This means that spi-mt65xx.c already probed these even before your IPM implementation, hence ***function of_mtk_spi_parse_dt() is not needed***. Simply drop it and don't check for these properties: that's already done. Regards, Angelo > + switch (value) { > + case 1: > + break; > + case 2: > + master->mode_bits |= SPI_TX_DUAL; > + break; > + case 4: > + master->mode_bits |= SPI_TX_QUAD; > + break; > + default: > + dev_warn(mdata->dev, > + "spi-tx-bus-width %d not supported\n", > + value); > + break; > + } > + } > + > + if (!of_property_read_u32(nc, "spi-rx-bus-width", &value)) { > + switch (value) { > + case 1: > + break; > + case 2: > + master->mode_bits |= SPI_RX_DUAL; > + break; > + case 4: > + master->mode_bits |= SPI_RX_QUAD; > + break; > + case 8: > + master->mode_bits |= SPI_RX_OCTAL; > + break; > + default: > + dev_warn(mdata->dev, > + "spi-rx-bus-width %d not supported\n", > + value); > + break; > + } > + } > +} > + > static int mtk_spi_probe(struct platform_device *pdev) > { > struct spi_master *master; > @@ -830,6 +1170,13 @@ static int mtk_spi_probe(struct platform_device *pdev) > if (mdata->dev_comp->ipm_design) > master->mode_bits |= SPI_LOOP; > > + if (mdata->dev_comp->ipm_design) { > + mdata->dev = &pdev->dev; > + master->mem_ops = &mtk_spi_mem_ops; > + of_mtk_spi_parse_dt(master, pdev->dev.of_node); > + init_completion(&mdata->spimem_done); > + } > + > if (mdata->dev_comp->need_pad_sel) { > mdata->pad_num = of_property_count_u32_elems( > pdev->dev.of_node,
On Tue, 2022-03-15 at 10:31 +0100, AngeloGioacchino Del Regno wrote: > Il 15/03/22 04:24, Leilk Liu ha scritto: > > this patch add the support of spi-mem for ipm design. > > > > Signed-off-by: Leilk Liu <leilk.liu@mediatek.com> > > --- > > drivers/spi/spi-mt65xx.c | 349 > > ++++++++++++++++++++++++++++++++++++++- > > 1 file changed, 348 insertions(+), 1 deletion(-) > > > > diff --git a/drivers/spi/spi-mt65xx.c b/drivers/spi/spi-mt65xx.c > > index 1a0b3208dfca..8958c3fa4fea 100644 > > --- a/drivers/spi/spi-mt65xx.c > > +++ b/drivers/spi/spi-mt65xx.c > > ...snip... > > > + > > +static void of_mtk_spi_parse_dt(struct spi_master *master, struct > > device_node *nc) > > +{ > > + struct mtk_spi *mdata = spi_master_get_devdata(master); > > + u32 value; > > + > > + if (!of_property_read_u32(nc, "spi-tx-bus-width", &value)) { > > Hello Leilk, > > thanks for considering my advice about "spi-{tx,rx}-bus-width", but > there's > something that you have misunderstood about it. > > Simply, you don't need this function at all. Whatever you are doing > here is > already being performed in the Linux SPI framework: at the end of the > probe > function, this driver is calling the (legacy) > devm_spi_register_master(), > which calls devm_spi_register_controller(). > > In drivers/spi/spi.c, function spi_register_controller(), will in > turn call > of_register_spi_devices(ctlr) -> of_register_spi_device(ctlr, nc)... > that > will end up finally calling function of_spi_parse_dt(ctlr, spi, nc). > > The last mentioned function already contains the logic and setup to > check > devicetree properties "spi-tx-bus-width" and "spi-rx-bus-width" (and > some > others, as well). > > This means that spi-mt65xx.c already probed these even before your > IPM > implementation, hence ***function of_mtk_spi_parse_dt() is not > needed***. > > Simply drop it and don't check for these properties: that's already > done. > > > Regards, > Angelo > Hi Angelo, Thanks for your advice. There are two spi controllor on MT7986. One supports single/dual mode, the other supports quad mode. Both of them can support spi memory framework(one's tx/rx bus width is 1/2, the other one's tx/rx bus width is 1/2/4). Can I use of_mtk_spi_parse_dt() to parse the information? What's your suggestion? Thanks! > > + switch (value) { > > + case 1: > > + break; > > + case 2: > > + master->mode_bits |= SPI_TX_DUAL; > > + break; > > + case 4: > > + master->mode_bits |= SPI_TX_QUAD; > > + break; > > + default: > > + dev_warn(mdata->dev, > > + "spi-tx-bus-width %d not supported\n", > > + value); > > + break; > > + } > > + } > > + > > + if (!of_property_read_u32(nc, "spi-rx-bus-width", &value)) { > > + switch (value) { > > + case 1: > > + break; > > + case 2: > > + master->mode_bits |= SPI_RX_DUAL; > > + break; > > + case 4: > > + master->mode_bits |= SPI_RX_QUAD; > > + break; > > + case 8: > > + master->mode_bits |= SPI_RX_OCTAL; > > + break; > > + default: > > + dev_warn(mdata->dev, > > + "spi-rx-bus-width %d not supported\n", > > + value); > > + break; > > + } > > + } > > +} > > + > > static int mtk_spi_probe(struct platform_device *pdev) > > { > > struct spi_master *master; > > @@ -830,6 +1170,13 @@ static int mtk_spi_probe(struct > > platform_device *pdev) > > if (mdata->dev_comp->ipm_design) > > master->mode_bits |= SPI_LOOP; > > > > + if (mdata->dev_comp->ipm_design) { > > + mdata->dev = &pdev->dev; > > + master->mem_ops = &mtk_spi_mem_ops; > > + of_mtk_spi_parse_dt(master, pdev->dev.of_node); > > + init_completion(&mdata->spimem_done); > > + } > > + > > if (mdata->dev_comp->need_pad_sel) { > > mdata->pad_num = of_property_count_u32_elems( > > pdev->dev.of_node,
Il 17/03/22 10:27, Leilk Liu ha scritto: > On Tue, 2022-03-15 at 10:31 +0100, AngeloGioacchino Del Regno wrote: >> Il 15/03/22 04:24, Leilk Liu ha scritto: >>> this patch add the support of spi-mem for ipm design. >>> >>> Signed-off-by: Leilk Liu <leilk.liu@mediatek.com> >>> --- >>> drivers/spi/spi-mt65xx.c | 349 >>> ++++++++++++++++++++++++++++++++++++++- >>> 1 file changed, 348 insertions(+), 1 deletion(-) >>> >>> diff --git a/drivers/spi/spi-mt65xx.c b/drivers/spi/spi-mt65xx.c >>> index 1a0b3208dfca..8958c3fa4fea 100644 >>> --- a/drivers/spi/spi-mt65xx.c >>> +++ b/drivers/spi/spi-mt65xx.c >> >> ...snip... >> >>> + >>> +static void of_mtk_spi_parse_dt(struct spi_master *master, struct >>> device_node *nc) >>> +{ >>> + struct mtk_spi *mdata = spi_master_get_devdata(master); >>> + u32 value; >>> + >>> + if (!of_property_read_u32(nc, "spi-tx-bus-width", &value)) { >> >> Hello Leilk, >> >> thanks for considering my advice about "spi-{tx,rx}-bus-width", but >> there's >> something that you have misunderstood about it. >> >> Simply, you don't need this function at all. Whatever you are doing >> here is >> already being performed in the Linux SPI framework: at the end of the >> probe >> function, this driver is calling the (legacy) >> devm_spi_register_master(), >> which calls devm_spi_register_controller(). >> >> In drivers/spi/spi.c, function spi_register_controller(), will in >> turn call >> of_register_spi_devices(ctlr) -> of_register_spi_device(ctlr, nc)... >> that >> will end up finally calling function of_spi_parse_dt(ctlr, spi, nc). >> >> The last mentioned function already contains the logic and setup to >> check >> devicetree properties "spi-tx-bus-width" and "spi-rx-bus-width" (and >> some >> others, as well). >> >> This means that spi-mt65xx.c already probed these even before your >> IPM >> implementation, hence ***function of_mtk_spi_parse_dt() is not >> needed***. >> >> Simply drop it and don't check for these properties: that's already >> done. >> >> >> Regards, >> Angelo >> > Hi Angelo, > > Thanks for your advice. > > There are two spi controllor on MT7986. One supports single/dual mode, > the other supports quad mode. Both of them can support spi memory > framework(one's tx/rx bus width is 1/2, the other one's tx/rx bus width > is 1/2/4). > > Can I use of_mtk_spi_parse_dt() to parse the information? What's your > suggestion? > > Thanks! > As I've already said, this does NOT require any devicetree handling in spi-mt65xx.c, as setting the right mode_bits is already handled in drivers/spi/spi.c - please follow the explaination that I have given before to fully understand the situation. Regards, Angelo > >>> + switch (value) { >>> + case 1: >>> + break; >>> + case 2: >>> + master->mode_bits |= SPI_TX_DUAL; >>> + break; >>> + case 4: >>> + master->mode_bits |= SPI_TX_QUAD; >>> + break; >>> + default: >>> + dev_warn(mdata->dev, >>> + "spi-tx-bus-width %d not supported\n", >>> + value); >>> + break; >>> + } >>> + } >>> + >>> + if (!of_property_read_u32(nc, "spi-rx-bus-width", &value)) { >>> + switch (value) { >>> + case 1:
On Thu, 2022-03-17 at 10:33 +0100, AngeloGioacchino Del Regno wrote: > Il 17/03/22 10:27, Leilk Liu ha scritto: > > On Tue, 2022-03-15 at 10:31 +0100, AngeloGioacchino Del Regno > > wrote: > > > Il 15/03/22 04:24, Leilk Liu ha scritto: > > > > this patch add the support of spi-mem for ipm design. > > > > > > > > Signed-off-by: Leilk Liu <leilk.liu@mediatek.com> > > > > --- > > > > drivers/spi/spi-mt65xx.c | 349 > > > > ++++++++++++++++++++++++++++++++++++++- > > > > 1 file changed, 348 insertions(+), 1 deletion(-) > > > > > > > > diff --git a/drivers/spi/spi-mt65xx.c b/drivers/spi/spi- > > > > mt65xx.c > > > > index 1a0b3208dfca..8958c3fa4fea 100644 > > > > --- a/drivers/spi/spi-mt65xx.c > > > > +++ b/drivers/spi/spi-mt65xx.c > > > > > > ...snip... > > > > > > > + > > > > +static void of_mtk_spi_parse_dt(struct spi_master *master, > > > > struct > > > > device_node *nc) > > > > +{ > > > > + struct mtk_spi *mdata = spi_master_get_devdata(master); > > > > + u32 value; > > > > + > > > > + if (!of_property_read_u32(nc, "spi-tx-bus-width", > > > > &value)) { > > > > > > Hello Leilk, > > > > > > thanks for considering my advice about "spi-{tx,rx}-bus-width", > > > but > > > there's > > > something that you have misunderstood about it. > > > > > > Simply, you don't need this function at all. Whatever you are > > > doing > > > here is > > > already being performed in the Linux SPI framework: at the end of > > > the > > > probe > > > function, this driver is calling the (legacy) > > > devm_spi_register_master(), > > > which calls devm_spi_register_controller(). > > > > > > In drivers/spi/spi.c, function spi_register_controller(), will in > > > turn call > > > of_register_spi_devices(ctlr) -> of_register_spi_device(ctlr, > > > nc)... > > > that > > > will end up finally calling function of_spi_parse_dt(ctlr, spi, > > > nc). > > > > > > The last mentioned function already contains the logic and setup > > > to > > > check > > > devicetree properties "spi-tx-bus-width" and "spi-rx-bus-width" > > > (and > > > some > > > others, as well). > > > > > > This means that spi-mt65xx.c already probed these even before > > > your > > > IPM > > > implementation, hence ***function of_mtk_spi_parse_dt() is not > > > needed***. > > > > > > Simply drop it and don't check for these properties: that's > > > already > > > done. > > > > > > > > > Regards, > > > Angelo > > > > > > > Hi Angelo, > > > > Thanks for your advice. > > > > There are two spi controllor on MT7986. One supports single/dual > > mode, > > the other supports quad mode. Both of them can support spi memory > > framework(one's tx/rx bus width is 1/2, the other one's tx/rx bus > > width > > is 1/2/4). > > > > Can I use of_mtk_spi_parse_dt() to parse the information? What's > > your > > suggestion? > > > > Thanks! > > > > As I've already said, this does NOT require any devicetree handling > in > spi-mt65xx.c, as setting the right mode_bits is already handled in > drivers/spi/spi.c - please follow the explaination that I have given > before to fully understand the situation. > > Regards, > Angelo > OK, I'll fix it, thanks. > > > > > > > + switch (value) { > > > > + case 1: > > > > + break; > > > > + case 2: > > > > + master->mode_bits |= SPI_TX_DUAL; > > > > + break; > > > > + case 4: > > > > + master->mode_bits |= SPI_TX_QUAD; > > > > + break; > > > > + default: > > > > + dev_warn(mdata->dev, > > > > + "spi-tx-bus-width %d not > > > > supported\n", > > > > + value); > > > > + break; > > > > + } > > > > + } > > > > + > > > > + if (!of_property_read_u32(nc, "spi-rx-bus-width", > > > > &value)) { > > > > + switch (value) { > > > > + case 1:
diff --git a/drivers/spi/spi-mt65xx.c b/drivers/spi/spi-mt65xx.c index 1a0b3208dfca..8958c3fa4fea 100644 --- a/drivers/spi/spi-mt65xx.c +++ b/drivers/spi/spi-mt65xx.c @@ -17,6 +17,7 @@ #include <linux/platform_data/spi-mt65xx.h> #include <linux/pm_runtime.h> #include <linux/spi/spi.h> +#include <linux/spi/spi-mem.h> #include <linux/dma-mapping.h> #define SPI_CFG0_REG 0x0000 @@ -78,8 +79,21 @@ #define SPI_CMD_IPM_GET_TICKDLY_OFFSET 22 #define SPI_CMD_IPM_GET_TICKDLY_MASK GENMASK(24, 22) + +#define PIN_MODE_CFG(x) ((x) / 2) + +#define SPI_CFG3_IPM_PIN_MODE_OFFSET 0 #define SPI_CFG3_IPM_HALF_DUPLEX_DIR BIT(2) #define SPI_CFG3_IPM_HALF_DUPLEX_EN BIT(3) +#define SPI_CFG3_IPM_XMODE_EN BIT(4) +#define SPI_CFG3_IPM_NODATA_FLAG BIT(5) +#define SPI_CFG3_IPM_CMD_BYTELEN_OFFSET 8 +#define SPI_CFG3_IPM_ADDR_BYTELEN_OFFSET 12 + +#define SPI_CFG3_IPM_CMD_PIN_MODE_MASK GENMASK(1, 0) +#define SPI_CFG3_IPM_CMD_BYTELEN_MASK GENMASK(11, 8) +#define SPI_CFG3_IPM_ADDR_BYTELEN_MASK GENMASK(15, 12) + #define MT8173_SPI_MAX_PAD_SEL 3 #define MTK_SPI_PAUSE_INT_STATUS 0x2 @@ -90,6 +104,8 @@ #define MTK_SPI_MAX_FIFO_SIZE 32U #define MTK_SPI_PACKET_SIZE 1024 #define MTK_SPI_IPM_PACKET_SIZE SZ_64K +#define MTK_SPI_IPM_PACKET_LOOP SZ_256 + #define MTK_SPI_32BITS_MASK (0xffffffff) #define DMA_ADDR_EXT_BITS (36) @@ -107,7 +123,6 @@ struct mtk_spi_compatible { bool no_need_unprepare; /* IPM design adjust and extend register to support more features */ bool ipm_design; - }; struct mtk_spi { @@ -123,6 +138,11 @@ struct mtk_spi { u32 tx_sgl_len, rx_sgl_len; const struct mtk_spi_compatible *dev_comp; u32 spi_clk_hz; + struct completion spimem_done; + bool use_spimem; + struct device *dev; + dma_addr_t tx_dma; + dma_addr_t rx_dma; }; static const struct mtk_spi_compatible mtk_common_compat; @@ -704,6 +724,12 @@ static irqreturn_t mtk_spi_interrupt(int irq, void *dev_id) else mdata->state = MTK_SPI_IDLE; + /* SPI-MEM ops */ + if (mdata->use_spimem) { + complete(&mdata->spimem_done); + return IRQ_HANDLED; + } + if (!master->can_dma(master, NULL, trans)) { if (trans->rx_buf) { cnt = mdata->xfer_len / 4; @@ -787,6 +813,320 @@ static irqreturn_t mtk_spi_interrupt(int irq, void *dev_id) return IRQ_HANDLED; } +static int mtk_spi_mem_adjust_op_size(struct spi_mem *mem, + struct spi_mem_op *op) +{ + int opcode_len; + + if (op->data.dir != SPI_MEM_NO_DATA) { + opcode_len = 1 + op->addr.nbytes + op->dummy.nbytes; + if (opcode_len + op->data.nbytes > MTK_SPI_IPM_PACKET_SIZE) { + op->data.nbytes = MTK_SPI_IPM_PACKET_SIZE - opcode_len; + /* force data buffer dma-aligned. */ + op->data.nbytes -= op->data.nbytes % 4; + } + } + + return 0; +} + +static bool mtk_spi_mem_supports_op(struct spi_mem *mem, + const struct spi_mem_op *op) +{ + if (op->data.buswidth > 4 || op->addr.buswidth > 4 || + op->dummy.buswidth > 4 || op->cmd.buswidth > 4) + return false; + + if (op->addr.nbytes && op->dummy.nbytes && + op->addr.buswidth != op->dummy.buswidth) + return false; + + if (op->addr.nbytes + op->dummy.nbytes > 16) + return false; + + if (op->data.nbytes > MTK_SPI_IPM_PACKET_SIZE) { + if (op->data.nbytes / MTK_SPI_IPM_PACKET_SIZE > + MTK_SPI_IPM_PACKET_LOOP || + op->data.nbytes % MTK_SPI_IPM_PACKET_SIZE != 0) + return false; + } + + return true; +} + +static void mtk_spi_mem_setup_dma_xfer(struct spi_master *master, + const struct spi_mem_op *op) +{ + struct mtk_spi *mdata = spi_master_get_devdata(master); + + writel((u32)(mdata->tx_dma & MTK_SPI_32BITS_MASK), + mdata->base + SPI_TX_SRC_REG); +#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT + if (mdata->dev_comp->dma_ext) + writel((u32)(mdata->tx_dma >> 32), + mdata->base + SPI_TX_SRC_REG_64); +#endif + + if (op->data.dir == SPI_MEM_DATA_IN) { + writel((u32)(mdata->rx_dma & MTK_SPI_32BITS_MASK), + mdata->base + SPI_RX_DST_REG); +#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT + if (mdata->dev_comp->dma_ext) + writel((u32)(mdata->rx_dma >> 32), + mdata->base + SPI_RX_DST_REG_64); +#endif + } +} + +static int mtk_spi_transfer_wait(struct spi_mem *mem, + const struct spi_mem_op *op) +{ + struct mtk_spi *mdata = spi_master_get_devdata(mem->spi->master); + /* + * For each byte we wait for 8 cycles of the SPI clock. + * Since speed is defined in Hz and we want milliseconds, + * so it should be 8 * 1000. + */ + u64 ms = 8000LL; + + if (op->data.dir == SPI_MEM_NO_DATA) + ms *= 32; /* prevent we may get 0 for short transfers. */ + else + ms *= op->data.nbytes; + ms = div_u64(ms, mem->spi->max_speed_hz); + ms += ms + 1000; /* 1s tolerance */ + + if (ms > UINT_MAX) + ms = UINT_MAX; + + if (!wait_for_completion_timeout(&mdata->spimem_done, + msecs_to_jiffies(ms))) { + dev_err(mdata->dev, "spi-mem transfer timeout\n"); + return -ETIMEDOUT; + } + + return 0; +} + +static int mtk_spi_mem_exec_op(struct spi_mem *mem, + const struct spi_mem_op *op) +{ + struct mtk_spi *mdata = spi_master_get_devdata(mem->spi->master); + u32 reg_val, nio, tx_size; + char *tx_tmp_buf, *rx_tmp_buf; + int ret = 0; + + mdata->use_spimem = true; + reinit_completion(&mdata->spimem_done); + + mtk_spi_reset(mdata); + mtk_spi_hw_init(mem->spi->master, mem->spi); + mtk_spi_prepare_transfer(mem->spi->master, mem->spi->max_speed_hz); + + reg_val = readl(mdata->base + SPI_CFG3_IPM_REG); + /* opcode byte len */ + reg_val &= ~SPI_CFG3_IPM_CMD_BYTELEN_MASK; + reg_val |= 1 << SPI_CFG3_IPM_CMD_BYTELEN_OFFSET; + + /* addr & dummy byte len */ + reg_val &= ~SPI_CFG3_IPM_ADDR_BYTELEN_MASK; + if (op->addr.nbytes || op->dummy.nbytes) + reg_val |= (op->addr.nbytes + op->dummy.nbytes) << + SPI_CFG3_IPM_ADDR_BYTELEN_OFFSET; + + /* data byte len */ + if (op->data.dir == SPI_MEM_NO_DATA) { + reg_val |= SPI_CFG3_IPM_NODATA_FLAG; + writel(0, mdata->base + SPI_CFG1_REG); + } else { + reg_val &= ~SPI_CFG3_IPM_NODATA_FLAG; + mdata->xfer_len = op->data.nbytes; + mtk_spi_setup_packet(mem->spi->master); + } + + if (op->addr.nbytes || op->dummy.nbytes) { + if (op->addr.buswidth == 1 || op->dummy.buswidth == 1) + reg_val |= SPI_CFG3_IPM_XMODE_EN; + else + reg_val &= ~SPI_CFG3_IPM_XMODE_EN; + } + + if (op->addr.buswidth == 2 || + op->dummy.buswidth == 2 || + op->data.buswidth == 2) + nio = 2; + else if (op->addr.buswidth == 4 || + op->dummy.buswidth == 4 || + op->data.buswidth == 4) + nio = 4; + else + nio = 1; + + reg_val &= ~SPI_CFG3_IPM_CMD_PIN_MODE_MASK; + reg_val |= PIN_MODE_CFG(nio) << SPI_CFG3_IPM_PIN_MODE_OFFSET; + + reg_val |= SPI_CFG3_IPM_HALF_DUPLEX_EN; + if (op->data.dir == SPI_MEM_DATA_IN) + reg_val |= SPI_CFG3_IPM_HALF_DUPLEX_DIR; + else + reg_val &= ~SPI_CFG3_IPM_HALF_DUPLEX_DIR; + writel(reg_val, mdata->base + SPI_CFG3_IPM_REG); + + tx_size = 1 + op->addr.nbytes + op->dummy.nbytes; + if (op->data.dir == SPI_MEM_DATA_OUT) + tx_size += op->data.nbytes; + + tx_size = max_t(u32, tx_size, 32); + + tx_tmp_buf = kzalloc(tx_size, GFP_KERNEL | GFP_DMA); + if (!tx_tmp_buf) { + mdata->use_spimem = false; + return -ENOMEM; + } + + tx_tmp_buf[0] = op->cmd.opcode; + + if (op->addr.nbytes) { + int i; + + for (i = 0; i < op->addr.nbytes; i++) + tx_tmp_buf[i + 1] = op->addr.val >> + (8 * (op->addr.nbytes - i - 1)); + } + + if (op->dummy.nbytes) + memset(tx_tmp_buf + op->addr.nbytes + 1, + 0xff, + op->dummy.nbytes); + + if (op->data.nbytes && op->data.dir == SPI_MEM_DATA_OUT) + memcpy(tx_tmp_buf + op->dummy.nbytes + op->addr.nbytes + 1, + op->data.buf.out, + op->data.nbytes); + + mdata->tx_dma = dma_map_single(mdata->dev, tx_tmp_buf, + tx_size, DMA_TO_DEVICE); + if (dma_mapping_error(mdata->dev, mdata->tx_dma)) { + ret = -ENOMEM; + goto err_exit; + } + + if (op->data.dir == SPI_MEM_DATA_IN) { + if (!IS_ALIGNED((size_t)op->data.buf.in, 4)) { + rx_tmp_buf = kzalloc(op->data.nbytes, + GFP_KERNEL | GFP_DMA); + if (!rx_tmp_buf) { + ret = -ENOMEM; + goto unmap_tx_dma; + } + } else { + rx_tmp_buf = op->data.buf.in; + } + + mdata->rx_dma = dma_map_single(mdata->dev, + rx_tmp_buf, + op->data.nbytes, + DMA_FROM_DEVICE); + if (dma_mapping_error(mdata->dev, mdata->rx_dma)) { + ret = -ENOMEM; + goto kfree_rx_tmp_buf; + } + } + + reg_val = readl(mdata->base + SPI_CMD_REG); + reg_val |= SPI_CMD_TX_DMA; + if (op->data.dir == SPI_MEM_DATA_IN) + reg_val |= SPI_CMD_RX_DMA; + writel(reg_val, mdata->base + SPI_CMD_REG); + + mtk_spi_mem_setup_dma_xfer(mem->spi->master, op); + + mtk_spi_enable_transfer(mem->spi->master); + + /* Wait for the interrupt. */ + ret = mtk_spi_transfer_wait(mem, op); + if (ret) + goto unmap_rx_dma; + + /* spi disable dma */ + reg_val = readl(mdata->base + SPI_CMD_REG); + reg_val &= ~SPI_CMD_TX_DMA; + if (op->data.dir == SPI_MEM_DATA_IN) + reg_val &= ~SPI_CMD_RX_DMA; + writel(reg_val, mdata->base + SPI_CMD_REG); + +unmap_rx_dma: + if (op->data.dir == SPI_MEM_DATA_IN) { + dma_unmap_single(mdata->dev, mdata->rx_dma, + op->data.nbytes, DMA_FROM_DEVICE); + if (!IS_ALIGNED((size_t)op->data.buf.in, 4)) + memcpy(op->data.buf.in, rx_tmp_buf, op->data.nbytes); + } +kfree_rx_tmp_buf: + if (op->data.dir == SPI_MEM_DATA_IN && + !IS_ALIGNED((size_t)op->data.buf.in, 4)) + kfree(rx_tmp_buf); +unmap_tx_dma: + dma_unmap_single(mdata->dev, mdata->tx_dma, + tx_size, DMA_TO_DEVICE); +err_exit: + kfree(tx_tmp_buf); + mdata->use_spimem = false; + + return ret; +} + +static const struct spi_controller_mem_ops mtk_spi_mem_ops = { + .adjust_op_size = mtk_spi_mem_adjust_op_size, + .supports_op = mtk_spi_mem_supports_op, + .exec_op = mtk_spi_mem_exec_op, +}; + +static void of_mtk_spi_parse_dt(struct spi_master *master, struct device_node *nc) +{ + struct mtk_spi *mdata = spi_master_get_devdata(master); + u32 value; + + if (!of_property_read_u32(nc, "spi-tx-bus-width", &value)) { + switch (value) { + case 1: + break; + case 2: + master->mode_bits |= SPI_TX_DUAL; + break; + case 4: + master->mode_bits |= SPI_TX_QUAD; + break; + default: + dev_warn(mdata->dev, + "spi-tx-bus-width %d not supported\n", + value); + break; + } + } + + if (!of_property_read_u32(nc, "spi-rx-bus-width", &value)) { + switch (value) { + case 1: + break; + case 2: + master->mode_bits |= SPI_RX_DUAL; + break; + case 4: + master->mode_bits |= SPI_RX_QUAD; + break; + case 8: + master->mode_bits |= SPI_RX_OCTAL; + break; + default: + dev_warn(mdata->dev, + "spi-rx-bus-width %d not supported\n", + value); + break; + } + } +} + static int mtk_spi_probe(struct platform_device *pdev) { struct spi_master *master; @@ -830,6 +1170,13 @@ static int mtk_spi_probe(struct platform_device *pdev) if (mdata->dev_comp->ipm_design) master->mode_bits |= SPI_LOOP; + if (mdata->dev_comp->ipm_design) { + mdata->dev = &pdev->dev; + master->mem_ops = &mtk_spi_mem_ops; + of_mtk_spi_parse_dt(master, pdev->dev.of_node); + init_completion(&mdata->spimem_done); + } + if (mdata->dev_comp->need_pad_sel) { mdata->pad_num = of_property_count_u32_elems( pdev->dev.of_node,
this patch add the support of spi-mem for ipm design. Signed-off-by: Leilk Liu <leilk.liu@mediatek.com> --- drivers/spi/spi-mt65xx.c | 349 ++++++++++++++++++++++++++++++++++++++- 1 file changed, 348 insertions(+), 1 deletion(-)