@@ -1,8 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright 2013-2014 Freescale Semiconductor, Inc.
/*
* drivers/dma/fsl-edma.c
*
- * Copyright 2013-2014 Freescale Semiconductor, Inc.
- *
* Driver for the Freescale eDMA engine with flexible channel multiplexing
* capability for DMA request sources. The eDMA block can be found on some
* Vybrid and Layerscape SoCs.
@@ -13,242 +13,20 @@
* option) any later version.
*/
-#include <linux/init.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/clk.h>
-#include <linux/dma-mapping.h>
-#include <linux/dmapool.h>
-#include <linux/slab.h>
-#include <linux/spinlock.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/of_dma.h>
-#include "virt-dma.h"
-
-#define EDMA_CR 0x00
-#define EDMA_ES 0x04
-#define EDMA_ERQ 0x0C
-#define EDMA_EEI 0x14
-#define EDMA_SERQ 0x1B
-#define EDMA_CERQ 0x1A
-#define EDMA_SEEI 0x19
-#define EDMA_CEEI 0x18
-#define EDMA_CINT 0x1F
-#define EDMA_CERR 0x1E
-#define EDMA_SSRT 0x1D
-#define EDMA_CDNE 0x1C
-#define EDMA_INTR 0x24
-#define EDMA_ERR 0x2C
-
-#define EDMA_TCD_SADDR(x) (0x1000 + 32 * (x))
-#define EDMA_TCD_SOFF(x) (0x1004 + 32 * (x))
-#define EDMA_TCD_ATTR(x) (0x1006 + 32 * (x))
-#define EDMA_TCD_NBYTES(x) (0x1008 + 32 * (x))
-#define EDMA_TCD_SLAST(x) (0x100C + 32 * (x))
-#define EDMA_TCD_DADDR(x) (0x1010 + 32 * (x))
-#define EDMA_TCD_DOFF(x) (0x1014 + 32 * (x))
-#define EDMA_TCD_CITER_ELINK(x) (0x1016 + 32 * (x))
-#define EDMA_TCD_CITER(x) (0x1016 + 32 * (x))
-#define EDMA_TCD_DLAST_SGA(x) (0x1018 + 32 * (x))
-#define EDMA_TCD_CSR(x) (0x101C + 32 * (x))
-#define EDMA_TCD_BITER_ELINK(x) (0x101E + 32 * (x))
-#define EDMA_TCD_BITER(x) (0x101E + 32 * (x))
-
-#define EDMA_CR_EDBG BIT(1)
-#define EDMA_CR_ERCA BIT(2)
-#define EDMA_CR_ERGA BIT(3)
-#define EDMA_CR_HOE BIT(4)
-#define EDMA_CR_HALT BIT(5)
-#define EDMA_CR_CLM BIT(6)
-#define EDMA_CR_EMLM BIT(7)
-#define EDMA_CR_ECX BIT(16)
-#define EDMA_CR_CX BIT(17)
-
-#define EDMA_SEEI_SEEI(x) ((x) & 0x1F)
-#define EDMA_CEEI_CEEI(x) ((x) & 0x1F)
-#define EDMA_CINT_CINT(x) ((x) & 0x1F)
-#define EDMA_CERR_CERR(x) ((x) & 0x1F)
-
-#define EDMA_TCD_ATTR_DSIZE(x) (((x) & 0x0007))
-#define EDMA_TCD_ATTR_DMOD(x) (((x) & 0x001F) << 3)
-#define EDMA_TCD_ATTR_SSIZE(x) (((x) & 0x0007) << 8)
-#define EDMA_TCD_ATTR_SMOD(x) (((x) & 0x001F) << 11)
-#define EDMA_TCD_ATTR_SSIZE_8BIT (0x0000)
-#define EDMA_TCD_ATTR_SSIZE_16BIT (0x0100)
-#define EDMA_TCD_ATTR_SSIZE_32BIT (0x0200)
-#define EDMA_TCD_ATTR_SSIZE_64BIT (0x0300)
-#define EDMA_TCD_ATTR_SSIZE_32BYTE (0x0500)
-#define EDMA_TCD_ATTR_DSIZE_8BIT (0x0000)
-#define EDMA_TCD_ATTR_DSIZE_16BIT (0x0001)
-#define EDMA_TCD_ATTR_DSIZE_32BIT (0x0002)
-#define EDMA_TCD_ATTR_DSIZE_64BIT (0x0003)
-#define EDMA_TCD_ATTR_DSIZE_32BYTE (0x0005)
-
-#define EDMA_TCD_SOFF_SOFF(x) (x)
-#define EDMA_TCD_NBYTES_NBYTES(x) (x)
-#define EDMA_TCD_SLAST_SLAST(x) (x)
-#define EDMA_TCD_DADDR_DADDR(x) (x)
-#define EDMA_TCD_CITER_CITER(x) ((x) & 0x7FFF)
-#define EDMA_TCD_DOFF_DOFF(x) (x)
-#define EDMA_TCD_DLAST_SGA_DLAST_SGA(x) (x)
-#define EDMA_TCD_BITER_BITER(x) ((x) & 0x7FFF)
-
-#define EDMA_TCD_CSR_START BIT(0)
-#define EDMA_TCD_CSR_INT_MAJOR BIT(1)
-#define EDMA_TCD_CSR_INT_HALF BIT(2)
-#define EDMA_TCD_CSR_D_REQ BIT(3)
-#define EDMA_TCD_CSR_E_SG BIT(4)
-#define EDMA_TCD_CSR_E_LINK BIT(5)
-#define EDMA_TCD_CSR_ACTIVE BIT(6)
-#define EDMA_TCD_CSR_DONE BIT(7)
-
-#define EDMAMUX_CHCFG_DIS 0x0
-#define EDMAMUX_CHCFG_ENBL 0x80
-#define EDMAMUX_CHCFG_SOURCE(n) ((n) & 0x3F)
-
-#define DMAMUX_NR 2
-
-#define FSL_EDMA_BUSWIDTHS BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) | \
- BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) | \
- BIT(DMA_SLAVE_BUSWIDTH_4_BYTES) | \
- BIT(DMA_SLAVE_BUSWIDTH_8_BYTES)
-enum fsl_edma_pm_state {
- RUNNING = 0,
- SUSPENDED,
-};
-
-struct fsl_edma_hw_tcd {
- __le32 saddr;
- __le16 soff;
- __le16 attr;
- __le32 nbytes;
- __le32 slast;
- __le32 daddr;
- __le16 doff;
- __le16 citer;
- __le32 dlast_sga;
- __le16 csr;
- __le16 biter;
-};
-
-struct fsl_edma_sw_tcd {
- dma_addr_t ptcd;
- struct fsl_edma_hw_tcd *vtcd;
-};
-
-struct fsl_edma_slave_config {
- enum dma_transfer_direction dir;
- enum dma_slave_buswidth addr_width;
- u32 dev_addr;
- u32 burst;
- u32 attr;
-};
-
-struct fsl_edma_chan {
- struct virt_dma_chan vchan;
- enum dma_status status;
- enum fsl_edma_pm_state pm_state;
- bool idle;
- u32 slave_id;
- struct fsl_edma_engine *edma;
- struct fsl_edma_desc *edesc;
- struct fsl_edma_slave_config fsc;
- struct dma_pool *tcd_pool;
-};
-
-struct fsl_edma_desc {
- struct virt_dma_desc vdesc;
- struct fsl_edma_chan *echan;
- bool iscyclic;
- unsigned int n_tcds;
- struct fsl_edma_sw_tcd tcd[];
-};
-
-struct fsl_edma_engine {
- struct dma_device dma_dev;
- void __iomem *membase;
- void __iomem *muxbase[DMAMUX_NR];
- struct clk *muxclk[DMAMUX_NR];
- struct mutex fsl_edma_mutex;
- u32 n_chans;
- int txirq;
- int errirq;
- bool big_endian;
- struct fsl_edma_chan chans[];
-};
-
-/*
- * R/W functions for big- or little-endian registers:
- * The eDMA controller's endian is independent of the CPU core's endian.
- * For the big-endian IP module, the offset for 8-bit or 16-bit registers
- * should also be swapped opposite to that in little-endian IP.
- */
+#include "fsl-edma-common.h"
-static u32 edma_readl(struct fsl_edma_engine *edma, void __iomem *addr)
-{
- if (edma->big_endian)
- return ioread32be(addr);
- else
- return ioread32(addr);
-}
-
-static void edma_writeb(struct fsl_edma_engine *edma, u8 val, void __iomem *addr)
-{
- /* swap the reg offset for these in big-endian mode */
- if (edma->big_endian)
- iowrite8(val, (void __iomem *)((unsigned long)addr ^ 0x3));
- else
- iowrite8(val, addr);
-}
-
-static void edma_writew(struct fsl_edma_engine *edma, u16 val, void __iomem *addr)
-{
- /* swap the reg offset for these in big-endian mode */
- if (edma->big_endian)
- iowrite16be(val, (void __iomem *)((unsigned long)addr ^ 0x2));
- else
- iowrite16(val, addr);
-}
-
-static void edma_writel(struct fsl_edma_engine *edma, u32 val, void __iomem *addr)
-{
- if (edma->big_endian)
- iowrite32be(val, addr);
- else
- iowrite32(val, addr);
-}
-
-static struct fsl_edma_chan *to_fsl_edma_chan(struct dma_chan *chan)
-{
- return container_of(chan, struct fsl_edma_chan, vchan.chan);
-}
-
-static struct fsl_edma_desc *to_fsl_edma_desc(struct virt_dma_desc *vd)
-{
- return container_of(vd, struct fsl_edma_desc, vdesc);
-}
-
-static void fsl_edma_enable_request(struct fsl_edma_chan *fsl_chan)
-{
- void __iomem *addr = fsl_chan->edma->membase;
- u32 ch = fsl_chan->vchan.chan.chan_id;
-
- edma_writeb(fsl_chan->edma, EDMA_SEEI_SEEI(ch), addr + EDMA_SEEI);
- edma_writeb(fsl_chan->edma, ch, addr + EDMA_SERQ);
-}
-
-static void fsl_edma_disable_request(struct fsl_edma_chan *fsl_chan)
-{
- void __iomem *addr = fsl_chan->edma->membase;
- u32 ch = fsl_chan->vchan.chan.chan_id;
-
- edma_writeb(fsl_chan->edma, ch, addr + EDMA_CERQ);
- edma_writeb(fsl_chan->edma, EDMA_CEEI_CEEI(ch), addr + EDMA_CEEI);
-}
+#define EDMAMUX_CHCFG_DIS 0
+#define EDMAMUX_CHCFG_ENBL BIT(7)
+#define EDMAMUX_CHCFG_SOURCE(n) ((n) & GENMASK(6, 0))
static void fsl_edma_chan_mux(struct fsl_edma_chan *fsl_chan,
unsigned int slot, bool enable)
@@ -268,416 +46,20 @@ static void fsl_edma_chan_mux(struct fsl_edma_chan *fsl_chan,
iowrite8(EDMAMUX_CHCFG_DIS, muxaddr + ch_off);
}
-static unsigned int fsl_edma_get_tcd_attr(enum dma_slave_buswidth addr_width)
-{
- switch (addr_width) {
- case 1:
- return EDMA_TCD_ATTR_SSIZE_8BIT | EDMA_TCD_ATTR_DSIZE_8BIT;
- case 2:
- return EDMA_TCD_ATTR_SSIZE_16BIT | EDMA_TCD_ATTR_DSIZE_16BIT;
- case 4:
- return EDMA_TCD_ATTR_SSIZE_32BIT | EDMA_TCD_ATTR_DSIZE_32BIT;
- case 8:
- return EDMA_TCD_ATTR_SSIZE_64BIT | EDMA_TCD_ATTR_DSIZE_64BIT;
- default:
- return EDMA_TCD_ATTR_SSIZE_32BIT | EDMA_TCD_ATTR_DSIZE_32BIT;
- }
-}
-
-static void fsl_edma_free_desc(struct virt_dma_desc *vdesc)
-{
- struct fsl_edma_desc *fsl_desc;
- int i;
-
- fsl_desc = to_fsl_edma_desc(vdesc);
- for (i = 0; i < fsl_desc->n_tcds; i++)
- dma_pool_free(fsl_desc->echan->tcd_pool, fsl_desc->tcd[i].vtcd,
- fsl_desc->tcd[i].ptcd);
- kfree(fsl_desc);
-}
-
-static int fsl_edma_terminate_all(struct dma_chan *chan)
-{
- struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);
- unsigned long flags;
- LIST_HEAD(head);
-
- spin_lock_irqsave(&fsl_chan->vchan.lock, flags);
- fsl_edma_disable_request(fsl_chan);
- fsl_chan->edesc = NULL;
- fsl_chan->idle = true;
- vchan_get_all_descriptors(&fsl_chan->vchan, &head);
- spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags);
- vchan_dma_desc_free_list(&fsl_chan->vchan, &head);
- return 0;
-}
-
-static int fsl_edma_pause(struct dma_chan *chan)
-{
- struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);
- unsigned long flags;
-
- spin_lock_irqsave(&fsl_chan->vchan.lock, flags);
- if (fsl_chan->edesc) {
- fsl_edma_disable_request(fsl_chan);
- fsl_chan->status = DMA_PAUSED;
- fsl_chan->idle = true;
- }
- spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags);
- return 0;
-}
-
-static int fsl_edma_resume(struct dma_chan *chan)
-{
- struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);
- unsigned long flags;
-
- spin_lock_irqsave(&fsl_chan->vchan.lock, flags);
- if (fsl_chan->edesc) {
- fsl_edma_enable_request(fsl_chan);
- fsl_chan->status = DMA_IN_PROGRESS;
- fsl_chan->idle = false;
- }
- spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags);
- return 0;
-}
-
-static int fsl_edma_slave_config(struct dma_chan *chan,
- struct dma_slave_config *cfg)
-{
- struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);
-
- fsl_chan->fsc.dir = cfg->direction;
- if (cfg->direction == DMA_DEV_TO_MEM) {
- fsl_chan->fsc.dev_addr = cfg->src_addr;
- fsl_chan->fsc.addr_width = cfg->src_addr_width;
- fsl_chan->fsc.burst = cfg->src_maxburst;
- fsl_chan->fsc.attr = fsl_edma_get_tcd_attr(cfg->src_addr_width);
- } else if (cfg->direction == DMA_MEM_TO_DEV) {
- fsl_chan->fsc.dev_addr = cfg->dst_addr;
- fsl_chan->fsc.addr_width = cfg->dst_addr_width;
- fsl_chan->fsc.burst = cfg->dst_maxburst;
- fsl_chan->fsc.attr = fsl_edma_get_tcd_attr(cfg->dst_addr_width);
- } else {
- return -EINVAL;
- }
- return 0;
-}
-
-static size_t fsl_edma_desc_residue(struct fsl_edma_chan *fsl_chan,
- struct virt_dma_desc *vdesc, bool in_progress)
-{
- struct fsl_edma_desc *edesc = fsl_chan->edesc;
- void __iomem *addr = fsl_chan->edma->membase;
- u32 ch = fsl_chan->vchan.chan.chan_id;
- enum dma_transfer_direction dir = fsl_chan->fsc.dir;
- dma_addr_t cur_addr, dma_addr;
- size_t len, size;
- int i;
-
- /* calculate the total size in this desc */
- for (len = i = 0; i < fsl_chan->edesc->n_tcds; i++)
- len += le32_to_cpu(edesc->tcd[i].vtcd->nbytes)
- * le16_to_cpu(edesc->tcd[i].vtcd->biter);
-
- if (!in_progress)
- return len;
-
- if (dir == DMA_MEM_TO_DEV)
- cur_addr = edma_readl(fsl_chan->edma, addr + EDMA_TCD_SADDR(ch));
- else
- cur_addr = edma_readl(fsl_chan->edma, addr + EDMA_TCD_DADDR(ch));
-
- /* figure out the finished and calculate the residue */
- for (i = 0; i < fsl_chan->edesc->n_tcds; i++) {
- size = le32_to_cpu(edesc->tcd[i].vtcd->nbytes)
- * le16_to_cpu(edesc->tcd[i].vtcd->biter);
- if (dir == DMA_MEM_TO_DEV)
- dma_addr = le32_to_cpu(edesc->tcd[i].vtcd->saddr);
- else
- dma_addr = le32_to_cpu(edesc->tcd[i].vtcd->daddr);
-
- len -= size;
- if (cur_addr >= dma_addr && cur_addr < dma_addr + size) {
- len += dma_addr + size - cur_addr;
- break;
- }
- }
-
- return len;
-}
-
-static enum dma_status fsl_edma_tx_status(struct dma_chan *chan,
- dma_cookie_t cookie, struct dma_tx_state *txstate)
-{
- struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);
- struct virt_dma_desc *vdesc;
- enum dma_status status;
- unsigned long flags;
-
- status = dma_cookie_status(chan, cookie, txstate);
- if (status == DMA_COMPLETE)
- return status;
-
- if (!txstate)
- return fsl_chan->status;
-
- spin_lock_irqsave(&fsl_chan->vchan.lock, flags);
- vdesc = vchan_find_desc(&fsl_chan->vchan, cookie);
- if (fsl_chan->edesc && cookie == fsl_chan->edesc->vdesc.tx.cookie)
- txstate->residue = fsl_edma_desc_residue(fsl_chan, vdesc, true);
- else if (vdesc)
- txstate->residue = fsl_edma_desc_residue(fsl_chan, vdesc, false);
- else
- txstate->residue = 0;
-
- spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags);
-
- return fsl_chan->status;
-}
-
-static void fsl_edma_set_tcd_regs(struct fsl_edma_chan *fsl_chan,
- struct fsl_edma_hw_tcd *tcd)
-{
- struct fsl_edma_engine *edma = fsl_chan->edma;
- void __iomem *addr = fsl_chan->edma->membase;
- u32 ch = fsl_chan->vchan.chan.chan_id;
-
- /*
- * TCD parameters are stored in struct fsl_edma_hw_tcd in little
- * endian format. However, we need to load the TCD registers in
- * big- or little-endian obeying the eDMA engine model endian.
- */
- edma_writew(edma, 0, addr + EDMA_TCD_CSR(ch));
- edma_writel(edma, le32_to_cpu(tcd->saddr), addr + EDMA_TCD_SADDR(ch));
- edma_writel(edma, le32_to_cpu(tcd->daddr), addr + EDMA_TCD_DADDR(ch));
-
- edma_writew(edma, le16_to_cpu(tcd->attr), addr + EDMA_TCD_ATTR(ch));
- edma_writew(edma, le16_to_cpu(tcd->soff), addr + EDMA_TCD_SOFF(ch));
-
- edma_writel(edma, le32_to_cpu(tcd->nbytes), addr + EDMA_TCD_NBYTES(ch));
- edma_writel(edma, le32_to_cpu(tcd->slast), addr + EDMA_TCD_SLAST(ch));
-
- edma_writew(edma, le16_to_cpu(tcd->citer), addr + EDMA_TCD_CITER(ch));
- edma_writew(edma, le16_to_cpu(tcd->biter), addr + EDMA_TCD_BITER(ch));
- edma_writew(edma, le16_to_cpu(tcd->doff), addr + EDMA_TCD_DOFF(ch));
-
- edma_writel(edma, le32_to_cpu(tcd->dlast_sga), addr + EDMA_TCD_DLAST_SGA(ch));
-
- edma_writew(edma, le16_to_cpu(tcd->csr), addr + EDMA_TCD_CSR(ch));
-}
-
-static inline
-void fsl_edma_fill_tcd(struct fsl_edma_hw_tcd *tcd, u32 src, u32 dst,
- u16 attr, u16 soff, u32 nbytes, u32 slast, u16 citer,
- u16 biter, u16 doff, u32 dlast_sga, bool major_int,
- bool disable_req, bool enable_sg)
-{
- u16 csr = 0;
-
- /*
- * eDMA hardware SGs require the TCDs to be stored in little
- * endian format irrespective of the register endian model.
- * So we put the value in little endian in memory, waiting
- * for fsl_edma_set_tcd_regs doing the swap.
- */
- tcd->saddr = cpu_to_le32(src);
- tcd->daddr = cpu_to_le32(dst);
-
- tcd->attr = cpu_to_le16(attr);
-
- tcd->soff = cpu_to_le16(EDMA_TCD_SOFF_SOFF(soff));
-
- tcd->nbytes = cpu_to_le32(EDMA_TCD_NBYTES_NBYTES(nbytes));
- tcd->slast = cpu_to_le32(EDMA_TCD_SLAST_SLAST(slast));
-
- tcd->citer = cpu_to_le16(EDMA_TCD_CITER_CITER(citer));
- tcd->doff = cpu_to_le16(EDMA_TCD_DOFF_DOFF(doff));
-
- tcd->dlast_sga = cpu_to_le32(EDMA_TCD_DLAST_SGA_DLAST_SGA(dlast_sga));
-
- tcd->biter = cpu_to_le16(EDMA_TCD_BITER_BITER(biter));
- if (major_int)
- csr |= EDMA_TCD_CSR_INT_MAJOR;
-
- if (disable_req)
- csr |= EDMA_TCD_CSR_D_REQ;
-
- if (enable_sg)
- csr |= EDMA_TCD_CSR_E_SG;
-
- tcd->csr = cpu_to_le16(csr);
-}
-
-static struct fsl_edma_desc *fsl_edma_alloc_desc(struct fsl_edma_chan *fsl_chan,
- int sg_len)
-{
- struct fsl_edma_desc *fsl_desc;
- int i;
-
- fsl_desc = kzalloc(sizeof(*fsl_desc) + sizeof(struct fsl_edma_sw_tcd) * sg_len,
- GFP_NOWAIT);
- if (!fsl_desc)
- return NULL;
-
- fsl_desc->echan = fsl_chan;
- fsl_desc->n_tcds = sg_len;
- for (i = 0; i < sg_len; i++) {
- fsl_desc->tcd[i].vtcd = dma_pool_alloc(fsl_chan->tcd_pool,
- GFP_NOWAIT, &fsl_desc->tcd[i].ptcd);
- if (!fsl_desc->tcd[i].vtcd)
- goto err;
- }
- return fsl_desc;
-
-err:
- while (--i >= 0)
- dma_pool_free(fsl_chan->tcd_pool, fsl_desc->tcd[i].vtcd,
- fsl_desc->tcd[i].ptcd);
- kfree(fsl_desc);
- return NULL;
-}
-
-static struct dma_async_tx_descriptor *fsl_edma_prep_dma_cyclic(
- struct dma_chan *chan, dma_addr_t dma_addr, size_t buf_len,
- size_t period_len, enum dma_transfer_direction direction,
- unsigned long flags)
-{
- struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);
- struct fsl_edma_desc *fsl_desc;
- dma_addr_t dma_buf_next;
- int sg_len, i;
- u32 src_addr, dst_addr, last_sg, nbytes;
- u16 soff, doff, iter;
-
- if (!is_slave_direction(fsl_chan->fsc.dir))
- return NULL;
-
- sg_len = buf_len / period_len;
- fsl_desc = fsl_edma_alloc_desc(fsl_chan, sg_len);
- if (!fsl_desc)
- return NULL;
- fsl_desc->iscyclic = true;
-
- dma_buf_next = dma_addr;
- nbytes = fsl_chan->fsc.addr_width * fsl_chan->fsc.burst;
- iter = period_len / nbytes;
-
- for (i = 0; i < sg_len; i++) {
- if (dma_buf_next >= dma_addr + buf_len)
- dma_buf_next = dma_addr;
-
- /* get next sg's physical address */
- last_sg = fsl_desc->tcd[(i + 1) % sg_len].ptcd;
-
- if (fsl_chan->fsc.dir == DMA_MEM_TO_DEV) {
- src_addr = dma_buf_next;
- dst_addr = fsl_chan->fsc.dev_addr;
- soff = fsl_chan->fsc.addr_width;
- doff = 0;
- } else {
- src_addr = fsl_chan->fsc.dev_addr;
- dst_addr = dma_buf_next;
- soff = 0;
- doff = fsl_chan->fsc.addr_width;
- }
-
- fsl_edma_fill_tcd(fsl_desc->tcd[i].vtcd, src_addr, dst_addr,
- fsl_chan->fsc.attr, soff, nbytes, 0, iter,
- iter, doff, last_sg, true, false, true);
- dma_buf_next += period_len;
- }
-
- return vchan_tx_prep(&fsl_chan->vchan, &fsl_desc->vdesc, flags);
-}
-
-static struct dma_async_tx_descriptor *fsl_edma_prep_slave_sg(
- struct dma_chan *chan, struct scatterlist *sgl,
- unsigned int sg_len, enum dma_transfer_direction direction,
- unsigned long flags, void *context)
-{
- struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);
- struct fsl_edma_desc *fsl_desc;
- struct scatterlist *sg;
- u32 src_addr, dst_addr, last_sg, nbytes;
- u16 soff, doff, iter;
- int i;
-
- if (!is_slave_direction(fsl_chan->fsc.dir))
- return NULL;
-
- fsl_desc = fsl_edma_alloc_desc(fsl_chan, sg_len);
- if (!fsl_desc)
- return NULL;
- fsl_desc->iscyclic = false;
-
- nbytes = fsl_chan->fsc.addr_width * fsl_chan->fsc.burst;
- for_each_sg(sgl, sg, sg_len, i) {
- /* get next sg's physical address */
- last_sg = fsl_desc->tcd[(i + 1) % sg_len].ptcd;
-
- if (fsl_chan->fsc.dir == DMA_MEM_TO_DEV) {
- src_addr = sg_dma_address(sg);
- dst_addr = fsl_chan->fsc.dev_addr;
- soff = fsl_chan->fsc.addr_width;
- doff = 0;
- } else {
- src_addr = fsl_chan->fsc.dev_addr;
- dst_addr = sg_dma_address(sg);
- soff = 0;
- doff = fsl_chan->fsc.addr_width;
- }
-
- iter = sg_dma_len(sg) / nbytes;
- if (i < sg_len - 1) {
- last_sg = fsl_desc->tcd[(i + 1)].ptcd;
- fsl_edma_fill_tcd(fsl_desc->tcd[i].vtcd, src_addr,
- dst_addr, fsl_chan->fsc.attr, soff,
- nbytes, 0, iter, iter, doff, last_sg,
- false, false, true);
- } else {
- last_sg = 0;
- fsl_edma_fill_tcd(fsl_desc->tcd[i].vtcd, src_addr,
- dst_addr, fsl_chan->fsc.attr, soff,
- nbytes, 0, iter, iter, doff, last_sg,
- true, true, false);
- }
- }
-
- return vchan_tx_prep(&fsl_chan->vchan, &fsl_desc->vdesc, flags);
-}
-
-static void fsl_edma_xfer_desc(struct fsl_edma_chan *fsl_chan)
-{
- struct virt_dma_desc *vdesc;
-
- vdesc = vchan_next_desc(&fsl_chan->vchan);
- if (!vdesc)
- return;
- fsl_chan->edesc = to_fsl_edma_desc(vdesc);
- fsl_edma_set_tcd_regs(fsl_chan, fsl_chan->edesc->tcd[0].vtcd);
- fsl_edma_enable_request(fsl_chan);
- fsl_chan->status = DMA_IN_PROGRESS;
- fsl_chan->idle = false;
-}
-
static irqreturn_t fsl_edma_tx_handler(int irq, void *dev_id)
{
struct fsl_edma_engine *fsl_edma = dev_id;
unsigned int intr, ch;
- void __iomem *base_addr;
struct fsl_edma_chan *fsl_chan;
+ struct edma_regs *regs = &fsl_edma->regs;
- base_addr = fsl_edma->membase;
-
- intr = edma_readl(fsl_edma, base_addr + EDMA_INTR);
+ intr = edma_readl(fsl_edma, regs->intl);
if (!intr)
return IRQ_NONE;
for (ch = 0; ch < fsl_edma->n_chans; ch++) {
if (intr & (0x1 << ch)) {
- edma_writeb(fsl_edma, EDMA_CINT_CINT(ch),
- base_addr + EDMA_CINT);
+ edma_writeb(fsl_edma, EDMA_CINT_CINT(ch), regs->cint);
fsl_chan = &fsl_edma->chans[ch];
@@ -705,16 +87,16 @@ static irqreturn_t fsl_edma_err_handler(int irq, void *dev_id)
{
struct fsl_edma_engine *fsl_edma = dev_id;
unsigned int err, ch;
+ struct edma_regs *regs = &fsl_edma->regs;
- err = edma_readl(fsl_edma, fsl_edma->membase + EDMA_ERR);
+ err = edma_readl(fsl_edma, regs->errl);
if (!err)
return IRQ_NONE;
for (ch = 0; ch < fsl_edma->n_chans; ch++) {
if (err & (0x1 << ch)) {
fsl_edma_disable_request(&fsl_edma->chans[ch]);
- edma_writeb(fsl_edma, EDMA_CERR_CERR(ch),
- fsl_edma->membase + EDMA_CERR);
+ edma_writeb(fsl_edma, EDMA_CERR_CERR(ch), regs->cerr);
fsl_edma->chans[ch].status = DMA_ERROR;
fsl_edma->chans[ch].idle = true;
}
@@ -730,25 +112,6 @@ static irqreturn_t fsl_edma_irq_handler(int irq, void *dev_id)
return fsl_edma_err_handler(irq, dev_id);
}
-static void fsl_edma_issue_pending(struct dma_chan *chan)
-{
- struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);
- unsigned long flags;
-
- spin_lock_irqsave(&fsl_chan->vchan.lock, flags);
-
- if (unlikely(fsl_chan->pm_state != RUNNING)) {
- spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags);
- /* cannot submit due to suspend */
- return;
- }
-
- if (vchan_issue_pending(&fsl_chan->vchan) && !fsl_chan->edesc)
- fsl_edma_xfer_desc(fsl_chan);
-
- spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags);
-}
-
static struct dma_chan *fsl_edma_xlate(struct of_phandle_args *dma_spec,
struct of_dma *ofdma)
{
@@ -761,7 +124,8 @@ static struct dma_chan *fsl_edma_xlate(struct of_phandle_args *dma_spec,
return NULL;
mutex_lock(&fsl_edma->fsl_edma_mutex);
- list_for_each_entry_safe(chan, _chan, &fsl_edma->dma_dev.channels, device_node) {
+ list_for_each_entry_safe(chan, _chan,
+ &fsl_edma->dma_dev.channels, device_node) {
if (chan->client_count)
continue;
if ((chan->chan_id / chans_per_mux) == dma_spec->args[0]) {
@@ -778,39 +142,12 @@ static struct dma_chan *fsl_edma_xlate(struct of_phandle_args *dma_spec,
}
}
mutex_unlock(&fsl_edma->fsl_edma_mutex);
- return NULL;
-}
-
-static int fsl_edma_alloc_chan_resources(struct dma_chan *chan)
-{
- struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);
-
- fsl_chan->tcd_pool = dma_pool_create("tcd_pool", chan->device->dev,
- sizeof(struct fsl_edma_hw_tcd),
- 32, 0);
- return 0;
-}
-static void fsl_edma_free_chan_resources(struct dma_chan *chan)
-{
- struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);
- unsigned long flags;
- LIST_HEAD(head);
-
- spin_lock_irqsave(&fsl_chan->vchan.lock, flags);
- fsl_edma_disable_request(fsl_chan);
- fsl_edma_chan_mux(fsl_chan, 0, false);
- fsl_chan->edesc = NULL;
- vchan_get_all_descriptors(&fsl_chan->vchan, &head);
- spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags);
-
- vchan_dma_desc_free_list(&fsl_chan->vchan, &head);
- dma_pool_destroy(fsl_chan->tcd_pool);
- fsl_chan->tcd_pool = NULL;
+ return NULL;
}
-static int
-fsl_edma_irq_init(struct platform_device *pdev, struct fsl_edma_engine *fsl_edma)
+static int fsl_edma_irq_init(struct platform_device *pdev,
+ struct fsl_edma_engine *fsl_edma)
{
int ret;
@@ -852,17 +189,6 @@ fsl_edma_irq_init(struct platform_device *pdev, struct fsl_edma_engine *fsl_edma
return 0;
}
-static void fsl_edma_irq_exit(
- struct platform_device *pdev, struct fsl_edma_engine *fsl_edma)
-{
- if (fsl_edma->txirq == fsl_edma->errirq) {
- devm_free_irq(&pdev->dev, fsl_edma->txirq, fsl_edma);
- } else {
- devm_free_irq(&pdev->dev, fsl_edma->txirq, fsl_edma);
- devm_free_irq(&pdev->dev, fsl_edma->errirq, fsl_edma);
- }
-}
-
static void fsl_disable_clocks(struct fsl_edma_engine *fsl_edma, int nr_clocks)
{
int i;
@@ -876,6 +202,7 @@ static int fsl_edma_probe(struct platform_device *pdev)
struct device_node *np = pdev->dev.of_node;
struct fsl_edma_engine *fsl_edma;
struct fsl_edma_chan *fsl_chan;
+ struct edma_regs *regs;
struct resource *res;
int len, chans;
int ret, i;
@@ -891,6 +218,8 @@ static int fsl_edma_probe(struct platform_device *pdev)
if (!fsl_edma)
return -ENOMEM;
+ fsl_edma->version = v1;
+
fsl_edma->n_chans = chans;
mutex_init(&fsl_edma->fsl_edma_mutex);
@@ -899,6 +228,9 @@ static int fsl_edma_probe(struct platform_device *pdev)
if (IS_ERR(fsl_edma->membase))
return PTR_ERR(fsl_edma->membase);
+ fsl_edma_setup_regs(fsl_edma);
+ regs = &fsl_edma->regs;
+
for (i = 0; i < DMAMUX_NR; i++) {
char clkname[32];
@@ -939,11 +271,11 @@ static int fsl_edma_probe(struct platform_device *pdev)
fsl_chan->vchan.desc_free = fsl_edma_free_desc;
vchan_init(&fsl_chan->vchan, &fsl_edma->dma_dev);
- edma_writew(fsl_edma, 0x0, fsl_edma->membase + EDMA_TCD_CSR(i));
+ edma_writew(fsl_edma, 0x0, ®s->tcd[i].csr);
fsl_edma_chan_mux(fsl_chan, 0, false);
}
- edma_writel(fsl_edma, ~0, fsl_edma->membase + EDMA_INTR);
+ edma_writel(fsl_edma, ~0, regs->intl);
ret = fsl_edma_irq_init(pdev, fsl_edma);
if (ret)
return ret;
@@ -990,28 +322,16 @@ static int fsl_edma_probe(struct platform_device *pdev)
}
/* enable round robin arbitration */
- edma_writel(fsl_edma, EDMA_CR_ERGA | EDMA_CR_ERCA, fsl_edma->membase + EDMA_CR);
+ edma_writel(fsl_edma, EDMA_CR_ERGA | EDMA_CR_ERCA, regs->cr);
return 0;
}
-static void fsl_edma_cleanup_vchan(struct dma_device *dmadev)
-{
- struct fsl_edma_chan *chan, *_chan;
-
- list_for_each_entry_safe(chan, _chan,
- &dmadev->channels, vchan.chan.device_node) {
- list_del(&chan->vchan.chan.device_node);
- tasklet_kill(&chan->vchan.task);
- }
-}
-
static int fsl_edma_remove(struct platform_device *pdev)
{
struct device_node *np = pdev->dev.of_node;
struct fsl_edma_engine *fsl_edma = platform_get_drvdata(pdev);
- fsl_edma_irq_exit(pdev, fsl_edma);
fsl_edma_cleanup_vchan(&fsl_edma->dma_dev);
of_dma_controller_free(np);
dma_async_device_unregister(&fsl_edma->dma_dev);
@@ -1048,18 +368,19 @@ static int fsl_edma_resume_early(struct device *dev)
{
struct fsl_edma_engine *fsl_edma = dev_get_drvdata(dev);
struct fsl_edma_chan *fsl_chan;
+ struct edma_regs *regs = &fsl_edma->regs;
int i;
for (i = 0; i < fsl_edma->n_chans; i++) {
fsl_chan = &fsl_edma->chans[i];
fsl_chan->pm_state = RUNNING;
- edma_writew(fsl_edma, 0x0, fsl_edma->membase + EDMA_TCD_CSR(i));
+ edma_writew(fsl_edma, 0x0, ®s->tcd[i].csr);
+
if (fsl_chan->slave_id != 0)
fsl_edma_chan_mux(fsl_chan, fsl_chan->slave_id, true);
}
- edma_writel(fsl_edma, EDMA_CR_ERGA | EDMA_CR_ERCA,
- fsl_edma->membase + EDMA_CR);
+ edma_writel(fsl_edma, EDMA_CR_ERGA | EDMA_CR_ERCA, regs->cr);
return 0;
}
This patch simplify fsl-edma removing all the code that has been collected in a separated common module (see patch 2/4). Signed-off-by: Angelo Dureghello <angelo@sysam.it> --- Changes for v2: - patch splitted into 4 - remove all the code gone into fsl-edma-common --- drivers/dma/fsl-edma.c | 739 ++--------------------------------------- 1 file changed, 30 insertions(+), 709 deletions(-)