diff options
Diffstat (limited to 'drivers/dma/fsl-edma-v3.c')
| -rw-r--r-- | drivers/dma/fsl-edma-v3.c | 1083 |
1 files changed, 1083 insertions, 0 deletions
diff --git a/drivers/dma/fsl-edma-v3.c b/drivers/dma/fsl-edma-v3.c new file mode 100644 index 000000000000..f74f46ad3fb1 --- /dev/null +++ b/drivers/dma/fsl-edma-v3.c @@ -0,0 +1,1083 @@ +/* + * drivers/dma/fsl-edma3-v3.c + * + * Copyright 2017-2018 NXP . + * + * Driver for the Freescale eDMA engine v3. This driver based on fsl-edma3.c + * but changed to meet the IP change on i.MX8QM: every dma channel is specific + * to hardware. For example, channel 14 for LPUART1 receive request and channel + * 13 for transmit requesst. The eDMA block can be found on i.MX8QM + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the + * Free Software Foundation; either version 2 of the License, or (at your + * 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 <soc/imx/revision.h> +#include <soc/imx8/soc.h> + +#include "virt-dma.h" + +#define EDMA_CH_CSR 0x00 +#define EDMA_CH_ES 0x04 +#define EDMA_CH_INT 0x08 +#define EDMA_CH_SBR 0x0C +#define EDMA_CH_PRI 0x10 +#define EDMA_TCD_SADDR 0x20 +#define EDMA_TCD_SOFF 0x24 +#define EDMA_TCD_ATTR 0x26 +#define EDMA_TCD_NBYTES 0x28 +#define EDMA_TCD_SLAST 0x2C +#define EDMA_TCD_DADDR 0x30 +#define EDMA_TCD_DOFF 0x34 +#define EDMA_TCD_CITER_ELINK 0x36 +#define EDMA_TCD_CITER 0x36 +#define EDMA_TCD_DLAST_SGA 0x38 +#define EDMA_TCD_CSR 0x3C +#define EDMA_TCD_BITER_ELINK 0x3E +#define EDMA_TCD_BITER 0x3E + +#define EDMA_CH_SBR_RD BIT(22) +#define EDMA_CH_SBR_WR BIT(21) +#define EDMA_CH_CSR_ERQ BIT(0) +#define EDMA_CH_CSR_EARQ BIT(1) +#define EDMA_CH_CSR_EEI BIT(2) +#define EDMA_CH_CSR_DONE BIT(30) +#define EDMA_CH_CSR_ACTIVE BIT(31) + +#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_16BYTE (0x0400) +#define EDMA_TCD_ATTR_SSIZE_32BYTE (0x0500) +#define EDMA_TCD_ATTR_SSIZE_64BYTE (0x0600) +#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_16BYTE (0x0004) +#define EDMA_TCD_ATTR_DSIZE_32BYTE (0x0005) +#define EDMA_TCD_ATTR_DSIZE_64BYTE (0x0006) + +#define EDMA_TCD_SOFF_SOFF(x) (x) +#define EDMA_TCD_NBYTES_NBYTES(x) (x) +#define EDMA_TCD_NBYTES_MLOFF(x) (x << 10) +#define EDMA_TCD_NBYTES_DMLOE (1 << 30) +#define EDMA_TCD_NBYTES_SMLOE (1 << 31) +#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 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) | \ + BIT(DMA_SLAVE_BUSWIDTH_16_BYTES)) + +#define ARGS_RX BIT(0) +#define ARGS_REMOTE BIT(1) +#define ARGS_DFIFO BIT(2) + +/* channel name template define in dts */ +#define CHAN_PREFIX "edma0-chan" +#define CHAN_POSFIX "-tx" + +enum fsl_edma3_pm_state { + RUNNING = 0, + SUSPENDED, +}; + +struct fsl_edma3_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_edma3_sw_tcd { + dma_addr_t ptcd; + struct fsl_edma3_hw_tcd *vtcd; +}; + +struct fsl_edma3_slave_config { + enum dma_transfer_direction dir; + enum dma_slave_buswidth addr_width; + u32 dev_addr; + u32 dev2_addr; /* source addr for dev2dev */ + u32 burst; + u32 attr; +}; + +struct fsl_edma3_chan { + struct virt_dma_chan vchan; + enum dma_status status; + enum fsl_edma3_pm_state pm_state; + bool idle; + bool used; + struct fsl_edma3_engine *edma3; + struct fsl_edma3_desc *edesc; + struct fsl_edma3_slave_config fsc; + void __iomem *membase; + int txirq; + int hw_chanid; + int priority; + int is_rxchan; + int is_remote; + int is_dfifo; + struct dma_pool *tcd_pool; + u32 chn_real_count; + char txirq_name[32]; +}; + +struct fsl_edma3_desc { + struct virt_dma_desc vdesc; + struct fsl_edma3_chan *echan; + bool iscyclic; + unsigned int n_tcds; + struct fsl_edma3_sw_tcd tcd[]; +}; + +struct fsl_edma3_reg_save { + u32 csr; + u32 sbr; +}; + +struct fsl_edma3_engine { + struct dma_device dma_dev; + struct mutex fsl_edma3_mutex; + u32 n_chans; + int errirq; + #define MAX_CHAN_NUM 32 + struct fsl_edma3_reg_save edma_regs[MAX_CHAN_NUM]; + bool swap; /* remote/local swapped on Audio edma */ + struct fsl_edma3_chan chans[]; +}; + +static struct fsl_edma3_chan *to_fsl_edma3_chan(struct dma_chan *chan) +{ + return container_of(chan, struct fsl_edma3_chan, vchan.chan); +} + +static struct fsl_edma3_desc *to_fsl_edma3_desc(struct virt_dma_desc *vd) +{ + return container_of(vd, struct fsl_edma3_desc, vdesc); +} + +static void fsl_edma3_enable_request(struct fsl_edma3_chan *fsl_chan) +{ + void __iomem *addr = fsl_chan->membase; + u32 val; + + val = readl(addr + EDMA_CH_SBR); + /* Remote/local swapped wrongly on iMX8 QM Audio edma */ + if (fsl_chan->edma3->swap) { + if (!fsl_chan->is_rxchan) + val |= EDMA_CH_SBR_RD; + else + val |= EDMA_CH_SBR_WR; + } else { + if (fsl_chan->is_rxchan) + val |= EDMA_CH_SBR_RD; + else + val |= EDMA_CH_SBR_WR; + } + + if (fsl_chan->is_remote) + val &= ~(EDMA_CH_SBR_RD | EDMA_CH_SBR_WR); + + writel(val, addr + EDMA_CH_SBR); + + val = readl(addr + EDMA_CH_CSR); + + val |= EDMA_CH_CSR_ERQ; + writel(val, addr + EDMA_CH_CSR); + + fsl_chan->used = true; +} + +static void fsl_edma3_disable_request(struct fsl_edma3_chan *fsl_chan) +{ + void __iomem *addr = fsl_chan->membase; + u32 val = readl(addr + EDMA_CH_CSR); + + val &= ~EDMA_CH_CSR_ERQ; + writel(val, addr + EDMA_CH_CSR); +} + +static unsigned int fsl_edma3_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; + case 16: + return EDMA_TCD_ATTR_SSIZE_16BYTE | EDMA_TCD_ATTR_DSIZE_16BYTE; + case 32: + return EDMA_TCD_ATTR_SSIZE_32BYTE | EDMA_TCD_ATTR_DSIZE_32BYTE; + case 64: + return EDMA_TCD_ATTR_SSIZE_64BYTE | EDMA_TCD_ATTR_DSIZE_64BYTE; + default: + return EDMA_TCD_ATTR_SSIZE_32BIT | EDMA_TCD_ATTR_DSIZE_32BIT; + } +} + +static void fsl_edma3_free_desc(struct virt_dma_desc *vdesc) +{ + struct fsl_edma3_desc *fsl_desc; + int i; + + fsl_desc = to_fsl_edma3_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_edma3_terminate_all(struct dma_chan *chan) +{ + struct fsl_edma3_chan *fsl_chan = to_fsl_edma3_chan(chan); + unsigned long flags; + LIST_HEAD(head); + + spin_lock_irqsave(&fsl_chan->vchan.lock, flags); + fsl_edma3_disable_request(fsl_chan); + fsl_chan->edesc = NULL; + fsl_chan->idle = true; + fsl_chan->used = false; + 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_edma3_pause(struct dma_chan *chan) +{ + struct fsl_edma3_chan *fsl_chan = to_fsl_edma3_chan(chan); + unsigned long flags; + + spin_lock_irqsave(&fsl_chan->vchan.lock, flags); + if (fsl_chan->edesc) { + fsl_edma3_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_edma3_resume(struct dma_chan *chan) +{ + struct fsl_edma3_chan *fsl_chan = to_fsl_edma3_chan(chan); + unsigned long flags; + + spin_lock_irqsave(&fsl_chan->vchan.lock, flags); + if (fsl_chan->edesc) { + fsl_edma3_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_edma3_slave_config(struct dma_chan *chan, + struct dma_slave_config *cfg) +{ + struct fsl_edma3_chan *fsl_chan = to_fsl_edma3_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_edma3_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_edma3_get_tcd_attr + (cfg->dst_addr_width); + } else if (cfg->direction == DMA_DEV_TO_DEV) { + fsl_chan->fsc.dev2_addr = cfg->src_addr; + 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_edma3_get_tcd_attr + (cfg->dst_addr_width); + } else { + return -EINVAL; + } + return 0; +} + +static size_t fsl_edma3_desc_residue(struct fsl_edma3_chan *fsl_chan, + struct virt_dma_desc *vdesc, bool in_progress) +{ + struct fsl_edma3_desc *edesc = fsl_chan->edesc; + void __iomem *addr = fsl_chan->membase; + 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 = readl(addr + EDMA_TCD_SADDR); + else + cur_addr = readl(addr + EDMA_TCD_DADDR); + + /* 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_edma3_tx_status(struct dma_chan *chan, + dma_cookie_t cookie, struct dma_tx_state *txstate) +{ + struct fsl_edma3_chan *fsl_chan = to_fsl_edma3_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) { + spin_lock_irqsave(&fsl_chan->vchan.lock, flags); + txstate->residue = fsl_chan->chn_real_count; + spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags); + 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_edma3_desc_residue(fsl_chan, vdesc, + true); + else if (vdesc) + txstate->residue = fsl_edma3_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_edma3_set_tcd_regs(struct fsl_edma3_chan *fsl_chan, + struct fsl_edma3_hw_tcd *tcd) +{ + void __iomem *addr = fsl_chan->membase; + /* + * TCD parameters are stored in struct fsl_edma3_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. + */ + writew(0, addr + EDMA_TCD_CSR); + writel(le32_to_cpu(tcd->saddr), addr + EDMA_TCD_SADDR); + writel(le32_to_cpu(tcd->daddr), addr + EDMA_TCD_DADDR); + + writew(le16_to_cpu(tcd->attr), addr + EDMA_TCD_ATTR); + writew(le16_to_cpu(tcd->soff), addr + EDMA_TCD_SOFF); + + writel(le32_to_cpu(tcd->nbytes), addr + EDMA_TCD_NBYTES); + writel(le32_to_cpu(tcd->slast), addr + EDMA_TCD_SLAST); + + writew(le16_to_cpu(tcd->citer), addr + EDMA_TCD_CITER); + writew(le16_to_cpu(tcd->biter), addr + EDMA_TCD_BITER); + writew(le16_to_cpu(tcd->doff), addr + EDMA_TCD_DOFF); + + writel(le32_to_cpu(tcd->dlast_sga), addr + EDMA_TCD_DLAST_SGA); + + /* Must clear CHa_CSR[DONE] bit before enable TCDa_CSR[ESG] */ + writel(readl(addr + EDMA_CH_CSR), addr + EDMA_CH_CSR); + + writew(le16_to_cpu(tcd->csr), addr + EDMA_TCD_CSR); +} + +static inline +void fsl_edma3_fill_tcd(struct fsl_edma3_chan *fsl_chan, + struct fsl_edma3_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_edma3_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)); + + if (fsl_chan->is_dfifo) { + /* set mloff as -8 */ + nbytes |= EDMA_TCD_NBYTES_MLOFF(-8); + /* enable DMLOE/SMLOE */ + if (fsl_chan->fsc.dir == DMA_MEM_TO_DEV) { + nbytes |= EDMA_TCD_NBYTES_DMLOE; + nbytes &= ~EDMA_TCD_NBYTES_SMLOE; + } else { + nbytes |= EDMA_TCD_NBYTES_SMLOE; + nbytes &= ~EDMA_TCD_NBYTES_DMLOE; + } + } + + 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; + + if (fsl_chan->is_rxchan) + csr |= EDMA_TCD_CSR_ACTIVE; + + tcd->csr = cpu_to_le16(csr); +} + +static struct fsl_edma3_desc *fsl_edma3_alloc_desc(struct fsl_edma3_chan + *fsl_chan, int sg_len) +{ + struct fsl_edma3_desc *fsl_desc; + int i; + + fsl_desc = kzalloc(sizeof(*fsl_desc) + sizeof(struct fsl_edma3_sw_tcd) + * sg_len, GFP_ATOMIC); + 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_ATOMIC, &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_edma3_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_edma3_chan *fsl_chan = to_fsl_edma3_chan(chan); + struct fsl_edma3_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; + + sg_len = buf_len / period_len; + fsl_desc = fsl_edma3_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; + if (fsl_chan->is_dfifo) + doff = 4; + else + doff = 0; + } else if (fsl_chan->fsc.dir == DMA_DEV_TO_MEM) { + src_addr = fsl_chan->fsc.dev_addr; + dst_addr = dma_buf_next; + if (fsl_chan->is_dfifo) + soff = 4; + else + soff = 0; + doff = fsl_chan->fsc.addr_width; + } else { + /* DMA_DEV_TO_DEV */ + src_addr = fsl_chan->fsc.dev2_addr; + dst_addr = fsl_chan->fsc.dev_addr; + soff = 0; + doff = 0; + } + + fsl_edma3_fill_tcd(fsl_chan, 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_edma3_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_edma3_chan *fsl_chan = to_fsl_edma3_chan(chan); + struct fsl_edma3_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_edma3_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 if (fsl_chan->fsc.dir == DMA_DEV_TO_MEM) { + src_addr = fsl_chan->fsc.dev_addr; + dst_addr = sg_dma_address(sg); + soff = 0; + doff = fsl_chan->fsc.addr_width; + } else { + /* DMA_DEV_TO_DEV */ + src_addr = fsl_chan->fsc.dev2_addr; + dst_addr = fsl_chan->fsc.dev_addr; + soff = 0; + doff = 0; + } + + iter = sg_dma_len(sg) / nbytes; + if (i < sg_len - 1) { + last_sg = fsl_desc->tcd[(i + 1)].ptcd; + fsl_edma3_fill_tcd(fsl_chan, 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_edma3_fill_tcd(fsl_chan, 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_edma3_xfer_desc(struct fsl_edma3_chan *fsl_chan) +{ + struct virt_dma_desc *vdesc; + + vdesc = vchan_next_desc(&fsl_chan->vchan); + if (!vdesc) + return; + fsl_chan->edesc = to_fsl_edma3_desc(vdesc); + fsl_edma3_set_tcd_regs(fsl_chan, fsl_chan->edesc->tcd[0].vtcd); + fsl_edma3_enable_request(fsl_chan); + fsl_chan->status = DMA_IN_PROGRESS; + fsl_chan->idle = false; +} + +static size_t fsl_edma3_desc_residue(struct fsl_edma3_chan *fsl_chan, + struct virt_dma_desc *vdesc, bool in_progress); + +static void fsl_edma3_get_realcnt(struct fsl_edma3_chan *fsl_chan) +{ + fsl_chan->chn_real_count = fsl_edma3_desc_residue(fsl_chan, NULL, true); +} + +static irqreturn_t fsl_edma3_tx_handler(int irq, void *dev_id) +{ + struct fsl_edma3_chan *fsl_chan = dev_id; + unsigned int intr; + void __iomem *base_addr; + + base_addr = fsl_chan->membase; + + intr = readl(base_addr + EDMA_CH_INT); + if (!intr) + return IRQ_NONE; + + writel(1, base_addr + EDMA_CH_INT); + + spin_lock(&fsl_chan->vchan.lock); + + /* Ignore this interrupt since channel has been disabled already */ + if (!fsl_chan->edesc) + goto irq_handled; + + if (!fsl_chan->edesc->iscyclic) { + fsl_edma3_get_realcnt(fsl_chan); + list_del(&fsl_chan->edesc->vdesc.node); + vchan_cookie_complete(&fsl_chan->edesc->vdesc); + fsl_chan->edesc = NULL; + fsl_chan->status = DMA_COMPLETE; + fsl_chan->idle = true; + } else { + vchan_cyclic_callback(&fsl_chan->edesc->vdesc); + } + + if (!fsl_chan->edesc) + fsl_edma3_xfer_desc(fsl_chan); +irq_handled: + spin_unlock(&fsl_chan->vchan.lock); + + return IRQ_HANDLED; +} + +static void fsl_edma3_issue_pending(struct dma_chan *chan) +{ + struct fsl_edma3_chan *fsl_chan = to_fsl_edma3_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_edma3_xfer_desc(fsl_chan); + + spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags); +} + +static struct dma_chan *fsl_edma3_xlate(struct of_phandle_args *dma_spec, + struct of_dma *ofdma) +{ + struct fsl_edma3_engine *fsl_edma3 = ofdma->of_dma_data; + struct dma_chan *chan, *_chan; + struct fsl_edma3_chan *fsl_chan; + + if (dma_spec->args_count != 3) + return NULL; + + mutex_lock(&fsl_edma3->fsl_edma3_mutex); + list_for_each_entry_safe(chan, _chan, &fsl_edma3->dma_dev.channels, + device_node) { + if (chan->client_count) + continue; + + fsl_chan = to_fsl_edma3_chan(chan); + if (fsl_chan->hw_chanid == dma_spec->args[0]) { + chan = dma_get_slave_channel(chan); + chan->device->privatecnt++; + fsl_chan->priority = dma_spec->args[1]; + fsl_chan->is_rxchan = dma_spec->args[2] & ARGS_RX; + fsl_chan->is_remote = dma_spec->args[2] & ARGS_REMOTE; + fsl_chan->is_dfifo = dma_spec->args[2] & ARGS_DFIFO; + mutex_unlock(&fsl_edma3->fsl_edma3_mutex); + return chan; + } + } + mutex_unlock(&fsl_edma3->fsl_edma3_mutex); + return NULL; +} + +static int fsl_edma3_alloc_chan_resources(struct dma_chan *chan) +{ + struct fsl_edma3_chan *fsl_chan = to_fsl_edma3_chan(chan); + + fsl_chan->tcd_pool = dma_pool_create("tcd_pool", chan->device->dev, + sizeof(struct fsl_edma3_hw_tcd), + 32, 0); + return 0; +} + +static void fsl_edma3_free_chan_resources(struct dma_chan *chan) +{ + struct fsl_edma3_chan *fsl_chan = to_fsl_edma3_chan(chan); + unsigned long flags; + LIST_HEAD(head); + + spin_lock_irqsave(&fsl_chan->vchan.lock, flags); + fsl_edma3_disable_request(fsl_chan); + 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; + fsl_chan->used = false; +} + +static void fsl_edma3_synchronize(struct dma_chan *chan) +{ + struct fsl_edma3_chan *fsl_chan = to_fsl_edma3_chan(chan); + + vchan_synchronize(&fsl_chan->vchan); +} + +static int fsl_edma3_probe(struct platform_device *pdev) +{ + struct device_node *np = pdev->dev.of_node; + struct fsl_edma3_engine *fsl_edma3; + struct fsl_edma3_chan *fsl_chan; + struct resource *res; + int len, chans; + int ret, i; + unsigned long irqflag = 0; + + ret = of_property_read_u32(np, "dma-channels", &chans); + if (ret) { + dev_err(&pdev->dev, "Can't get dma-channels.\n"); + return ret; + } + + len = sizeof(*fsl_edma3) + sizeof(*fsl_chan) * chans; + fsl_edma3 = devm_kzalloc(&pdev->dev, len, GFP_KERNEL); + if (!fsl_edma3) + return -ENOMEM; + + /* Audio edma rx/tx channel shared interrupt */ + if (of_property_read_bool(np, "shared-interrupt")) + irqflag = IRQF_SHARED; + + fsl_edma3->swap = false; + fsl_edma3->n_chans = chans; + + /* + * FIXUP: if this is the i.MX8QM TO1.0, need set the swap. + * FIXME: This will be revisted to set the swap property + * from the device-tree node later instead of revison check, + * but, this will need add extra DT file, not perfect too. + */ + + if ((of_device_is_compatible(np, "fsl,imx8qm-adma")) && + cpu_is_imx8qm() && + imx8_get_soc_revision() == IMX_CHIP_REVISION_1_0) + fsl_edma3->swap = true; + + INIT_LIST_HEAD(&fsl_edma3->dma_dev.channels); + for (i = 0; i < fsl_edma3->n_chans; i++) { + struct fsl_edma3_chan *fsl_chan = &fsl_edma3->chans[i]; + const char *txirq_name = fsl_chan->txirq_name; + char chanid[3], id_len = 0; + char *p = chanid; + unsigned long val; + + fsl_chan->edma3 = fsl_edma3; + fsl_chan->pm_state = RUNNING; + fsl_chan->idle = true; + /* Get per channel membase */ + res = platform_get_resource(pdev, IORESOURCE_MEM, i); + fsl_chan->membase = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(fsl_chan->membase)) + return PTR_ERR(fsl_chan->membase); + + /* Get the hardware chanel id by the channel membase + * channel0:0x10000, channel1:0x20000... total 32 channels + */ + fsl_chan->hw_chanid = (res->start >> 16) & 0x1f; + + ret = of_property_read_string_index(np, "interrupt-names", i, + &txirq_name); + if (ret) { + dev_err(&pdev->dev, "read interrupt-names fail.\n"); + return ret; + } + /* Get channel id length from dts, one-digit or double-digit */ + id_len = strlen(txirq_name) - strlen(CHAN_PREFIX) - + strlen(CHAN_POSFIX); + if (id_len > 2) { + dev_err(&pdev->dev, "%s is edmaX-chanX-tx in dts?\n", + res->name); + return -EINVAL; + } + /* Grab channel id from txirq_name */ + strncpy(p, txirq_name + strlen(CHAN_PREFIX), id_len); + *(p + id_len) = '\0'; + + /* check if the channel id match well with hw_chanid */ + ret = kstrtoul(chanid, 0, &val); + if (ret || val != fsl_chan->hw_chanid) { + dev_err(&pdev->dev, "%s,wrong id?\n", txirq_name); + return -EINVAL; + } + + /* request channel irq */ + fsl_chan->txirq = platform_get_irq_byname(pdev, txirq_name); + if (fsl_chan->txirq < 0) { + dev_err(&pdev->dev, "Can't get %s irq.\n", txirq_name); + return fsl_chan->txirq; + } + + ret = devm_request_irq(&pdev->dev, fsl_chan->txirq, + fsl_edma3_tx_handler, irqflag, txirq_name, + fsl_chan); + if (ret) { + dev_err(&pdev->dev, "Can't register %s IRQ.\n", + txirq_name); + return ret; + } + + fsl_chan->vchan.desc_free = fsl_edma3_free_desc; + vchan_init(&fsl_chan->vchan, &fsl_edma3->dma_dev); + fsl_chan->used = false; + } + + mutex_init(&fsl_edma3->fsl_edma3_mutex); + + dma_cap_set(DMA_PRIVATE, fsl_edma3->dma_dev.cap_mask); + dma_cap_set(DMA_SLAVE, fsl_edma3->dma_dev.cap_mask); + dma_cap_set(DMA_CYCLIC, fsl_edma3->dma_dev.cap_mask); + + fsl_edma3->dma_dev.dev = &pdev->dev; + fsl_edma3->dma_dev.device_alloc_chan_resources + = fsl_edma3_alloc_chan_resources; + fsl_edma3->dma_dev.device_free_chan_resources + = fsl_edma3_free_chan_resources; + fsl_edma3->dma_dev.device_tx_status = fsl_edma3_tx_status; + fsl_edma3->dma_dev.device_prep_slave_sg = fsl_edma3_prep_slave_sg; + fsl_edma3->dma_dev.device_prep_dma_cyclic = fsl_edma3_prep_dma_cyclic; + fsl_edma3->dma_dev.device_config = fsl_edma3_slave_config; + fsl_edma3->dma_dev.device_pause = fsl_edma3_pause; + fsl_edma3->dma_dev.device_resume = fsl_edma3_resume; + fsl_edma3->dma_dev.device_terminate_all = fsl_edma3_terminate_all; + fsl_edma3->dma_dev.device_issue_pending = fsl_edma3_issue_pending; + fsl_edma3->dma_dev.device_synchronize = fsl_edma3_synchronize; + + fsl_edma3->dma_dev.src_addr_widths = FSL_EDMA_BUSWIDTHS; + fsl_edma3->dma_dev.dst_addr_widths = FSL_EDMA_BUSWIDTHS; + fsl_edma3->dma_dev.directions = BIT(DMA_DEV_TO_MEM) | + BIT(DMA_MEM_TO_DEV) | + BIT(DMA_DEV_TO_DEV); + + platform_set_drvdata(pdev, fsl_edma3); + + ret = dma_async_device_register(&fsl_edma3->dma_dev); + if (ret) { + dev_err(&pdev->dev, "Can't register Freescale eDMA engine.\n"); + return ret; + } + + ret = of_dma_controller_register(np, fsl_edma3_xlate, fsl_edma3); + if (ret) { + dev_err(&pdev->dev, "Can't register Freescale eDMA of_dma.\n"); + dma_async_device_unregister(&fsl_edma3->dma_dev); + return ret; + } + + return 0; +} + +static int fsl_edma3_remove(struct platform_device *pdev) +{ + struct device_node *np = pdev->dev.of_node; + struct fsl_edma3_engine *fsl_edma3 = platform_get_drvdata(pdev); + + of_dma_controller_free(np); + dma_async_device_unregister(&fsl_edma3->dma_dev); + + return 0; +} + +static int fsl_edma3_suspend_late(struct device *dev) +{ + struct fsl_edma3_engine *fsl_edma = dev_get_drvdata(dev); + struct fsl_edma3_chan *fsl_chan; + unsigned long flags; + void __iomem *addr; + int i; + + for (i = 0; i < fsl_edma->n_chans; i++) { + fsl_chan = &fsl_edma->chans[i]; + addr = fsl_chan->membase; + + if (!fsl_chan->used) + continue; + spin_lock_irqsave(&fsl_chan->vchan.lock, flags); + fsl_edma->edma_regs[i].csr = readl(addr + EDMA_CH_CSR); + fsl_edma->edma_regs[i].sbr = readl(addr + EDMA_CH_SBR); + /* Make sure chan is idle or will force disable. */ + if (unlikely(!fsl_chan->idle)) { + dev_warn(dev, "WARN: There is non-idle channel."); + fsl_edma3_disable_request(fsl_chan); + } + fsl_chan->pm_state = SUSPENDED; + spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags); + } + + return 0; +} + +static int fsl_edma3_resume_early(struct device *dev) +{ + struct fsl_edma3_engine *fsl_edma = dev_get_drvdata(dev); + struct fsl_edma3_chan *fsl_chan; + void __iomem *addr; + unsigned long flags; + int i; + + for (i = 0; i < fsl_edma->n_chans; i++) { + fsl_chan = &fsl_edma->chans[i]; + addr = fsl_chan->membase; + + if (!fsl_chan->used) + continue; + + spin_lock_irqsave(&fsl_chan->vchan.lock, flags); + writel(fsl_edma->edma_regs[i].csr, addr + EDMA_CH_CSR); + writel(fsl_edma->edma_regs[i].sbr, addr + EDMA_CH_SBR); + /* restore tcd if this channel not terminated before suspend */ + if (fsl_chan->edesc) + fsl_edma3_set_tcd_regs(fsl_chan, + fsl_chan->edesc->tcd[0].vtcd); + fsl_chan->pm_state = RUNNING; + spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags); + } + + return 0; +} + +static const struct dev_pm_ops fsl_edma3_pm_ops = { + .suspend_late = fsl_edma3_suspend_late, + .resume_early = fsl_edma3_resume_early, +}; + +static const struct of_device_id fsl_edma3_dt_ids[] = { + { .compatible = "fsl,imx8qm-edma", }, + { .compatible = "fsl,imx8qm-adma", }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, fsl_edma3_dt_ids); + +static struct platform_driver fsl_edma3_driver = { + .driver = { + .name = "fsl-edma-v3", + .of_match_table = fsl_edma3_dt_ids, + .pm = &fsl_edma3_pm_ops, + }, + .probe = fsl_edma3_probe, + .remove = fsl_edma3_remove, +}; + +static int __init fsl_edma3_init(void) +{ + return platform_driver_register(&fsl_edma3_driver); +} +subsys_initcall(fsl_edma3_init); + +static void __exit fsl_edma3_exit(void) +{ + platform_driver_unregister(&fsl_edma3_driver); +} +module_exit(fsl_edma3_exit); + +MODULE_ALIAS("platform:fsl-edma3"); +MODULE_DESCRIPTION("Freescale eDMA-V3 engine driver"); +MODULE_LICENSE("GPL v2"); |