+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0+
-/*
- * GDMA4740 DMAC support
- */
-
-#include <linux/dmaengine.h>
-#include <linux/dma-mapping.h>
-#include <linux/err.h>
-#include <linux/init.h>
-#include <linux/list.h>
-#include <linux/module.h>
-#include <linux/platform_device.h>
-#include <linux/slab.h>
-#include <linux/spinlock.h>
-#include <linux/irq.h>
-#include <linux/of_dma.h>
-#include <linux/reset.h>
-#include <linux/of_device.h>
-
-#include "virt-dma.h"
-
-#define GDMA_REG_SRC_ADDR(x) (0x00 + (x) * 0x10)
-#define GDMA_REG_DST_ADDR(x) (0x04 + (x) * 0x10)
-
-#define GDMA_REG_CTRL0(x) (0x08 + (x) * 0x10)
-#define GDMA_REG_CTRL0_TX_MASK 0xffff
-#define GDMA_REG_CTRL0_TX_SHIFT 16
-#define GDMA_REG_CTRL0_CURR_MASK 0xff
-#define GDMA_REG_CTRL0_CURR_SHIFT 8
-#define GDMA_REG_CTRL0_SRC_ADDR_FIXED BIT(7)
-#define GDMA_REG_CTRL0_DST_ADDR_FIXED BIT(6)
-#define GDMA_REG_CTRL0_BURST_MASK 0x7
-#define GDMA_REG_CTRL0_BURST_SHIFT 3
-#define GDMA_REG_CTRL0_DONE_INT BIT(2)
-#define GDMA_REG_CTRL0_ENABLE BIT(1)
-#define GDMA_REG_CTRL0_SW_MODE BIT(0)
-
-#define GDMA_REG_CTRL1(x) (0x0c + (x) * 0x10)
-#define GDMA_REG_CTRL1_SEG_MASK 0xf
-#define GDMA_REG_CTRL1_SEG_SHIFT 22
-#define GDMA_REG_CTRL1_REQ_MASK 0x3f
-#define GDMA_REG_CTRL1_SRC_REQ_SHIFT 16
-#define GDMA_REG_CTRL1_DST_REQ_SHIFT 8
-#define GDMA_REG_CTRL1_NEXT_MASK 0x1f
-#define GDMA_REG_CTRL1_NEXT_SHIFT 3
-#define GDMA_REG_CTRL1_COHERENT BIT(2)
-#define GDMA_REG_CTRL1_FAIL BIT(1)
-#define GDMA_REG_CTRL1_MASK BIT(0)
-
-#define GDMA_REG_UNMASK_INT 0x200
-#define GDMA_REG_DONE_INT 0x204
-
-#define GDMA_REG_GCT 0x220
-#define GDMA_REG_GCT_CHAN_MASK 0x3
-#define GDMA_REG_GCT_CHAN_SHIFT 3
-#define GDMA_REG_GCT_VER_MASK 0x3
-#define GDMA_REG_GCT_VER_SHIFT 1
-#define GDMA_REG_GCT_ARBIT_RR BIT(0)
-
-#define GDMA_REG_REQSTS 0x2a0
-#define GDMA_REG_ACKSTS 0x2a4
-#define GDMA_REG_FINSTS 0x2a8
-
-/* for RT305X gdma registers */
-#define GDMA_RT305X_CTRL0_REQ_MASK 0xf
-#define GDMA_RT305X_CTRL0_SRC_REQ_SHIFT 12
-#define GDMA_RT305X_CTRL0_DST_REQ_SHIFT 8
-
-#define GDMA_RT305X_CTRL1_FAIL BIT(4)
-#define GDMA_RT305X_CTRL1_NEXT_MASK 0x7
-#define GDMA_RT305X_CTRL1_NEXT_SHIFT 1
-
-#define GDMA_RT305X_STATUS_INT 0x80
-#define GDMA_RT305X_STATUS_SIGNAL 0x84
-#define GDMA_RT305X_GCT 0x88
-
-/* for MT7621 gdma registers */
-#define GDMA_REG_PERF_START(x) (0x230 + (x) * 0x8)
-#define GDMA_REG_PERF_END(x) (0x234 + (x) * 0x8)
-
-enum gdma_dma_transfer_size {
- GDMA_TRANSFER_SIZE_4BYTE = 0,
- GDMA_TRANSFER_SIZE_8BYTE = 1,
- GDMA_TRANSFER_SIZE_16BYTE = 2,
- GDMA_TRANSFER_SIZE_32BYTE = 3,
- GDMA_TRANSFER_SIZE_64BYTE = 4,
-};
-
-struct gdma_dma_sg {
- dma_addr_t src_addr;
- dma_addr_t dst_addr;
- u32 len;
-};
-
-struct gdma_dma_desc {
- struct virt_dma_desc vdesc;
-
- enum dma_transfer_direction direction;
- bool cyclic;
-
- u32 residue;
- unsigned int num_sgs;
- struct gdma_dma_sg sg[];
-};
-
-struct gdma_dmaengine_chan {
- struct virt_dma_chan vchan;
- unsigned int id;
- unsigned int slave_id;
-
- dma_addr_t fifo_addr;
- enum gdma_dma_transfer_size burst_size;
-
- struct gdma_dma_desc *desc;
- unsigned int next_sg;
-};
-
-struct gdma_dma_dev {
- struct dma_device ddev;
- struct device_dma_parameters dma_parms;
- struct gdma_data *data;
- void __iomem *base;
- struct tasklet_struct task;
- volatile unsigned long chan_issued;
- atomic_t cnt;
-
- struct gdma_dmaengine_chan chan[];
-};
-
-struct gdma_data {
- int chancnt;
- u32 done_int_reg;
- void (*init)(struct gdma_dma_dev *dma_dev);
- int (*start_transfer)(struct gdma_dmaengine_chan *chan);
-};
-
-static struct gdma_dma_dev *gdma_dma_chan_get_dev(
- struct gdma_dmaengine_chan *chan)
-{
- return container_of(chan->vchan.chan.device, struct gdma_dma_dev,
- ddev);
-}
-
-static struct gdma_dmaengine_chan *to_gdma_dma_chan(struct dma_chan *c)
-{
- return container_of(c, struct gdma_dmaengine_chan, vchan.chan);
-}
-
-static struct gdma_dma_desc *to_gdma_dma_desc(struct virt_dma_desc *vdesc)
-{
- return container_of(vdesc, struct gdma_dma_desc, vdesc);
-}
-
-static inline uint32_t gdma_dma_read(struct gdma_dma_dev *dma_dev,
- unsigned int reg)
-{
- return readl(dma_dev->base + reg);
-}
-
-static inline void gdma_dma_write(struct gdma_dma_dev *dma_dev,
- unsigned int reg, uint32_t val)
-{
- writel(val, dma_dev->base + reg);
-}
-
-static enum gdma_dma_transfer_size gdma_dma_maxburst(u32 maxburst)
-{
- if (maxburst < 2)
- return GDMA_TRANSFER_SIZE_4BYTE;
- else if (maxburst < 4)
- return GDMA_TRANSFER_SIZE_8BYTE;
- else if (maxburst < 8)
- return GDMA_TRANSFER_SIZE_16BYTE;
- else if (maxburst < 16)
- return GDMA_TRANSFER_SIZE_32BYTE;
- else
- return GDMA_TRANSFER_SIZE_64BYTE;
-}
-
-static int gdma_dma_config(struct dma_chan *c,
- struct dma_slave_config *config)
-{
- struct gdma_dmaengine_chan *chan = to_gdma_dma_chan(c);
- struct gdma_dma_dev *dma_dev = gdma_dma_chan_get_dev(chan);
-
- if (config->device_fc) {
- dev_err(dma_dev->ddev.dev, "not support flow controller\n");
- return -EINVAL;
- }
-
- switch (config->direction) {
- case DMA_MEM_TO_DEV:
- if (config->dst_addr_width != DMA_SLAVE_BUSWIDTH_4_BYTES) {
- dev_err(dma_dev->ddev.dev, "only support 4 byte buswidth\n");
- return -EINVAL;
- }
- chan->slave_id = config->slave_id;
- chan->fifo_addr = config->dst_addr;
- chan->burst_size = gdma_dma_maxburst(config->dst_maxburst);
- break;
- case DMA_DEV_TO_MEM:
- if (config->src_addr_width != DMA_SLAVE_BUSWIDTH_4_BYTES) {
- dev_err(dma_dev->ddev.dev, "only support 4 byte buswidth\n");
- return -EINVAL;
- }
- chan->slave_id = config->slave_id;
- chan->fifo_addr = config->src_addr;
- chan->burst_size = gdma_dma_maxburst(config->src_maxburst);
- break;
- default:
- dev_err(dma_dev->ddev.dev, "direction type %d error\n",
- config->direction);
- return -EINVAL;
- }
-
- return 0;
-}
-
-static int gdma_dma_terminate_all(struct dma_chan *c)
-{
- struct gdma_dmaengine_chan *chan = to_gdma_dma_chan(c);
- struct gdma_dma_dev *dma_dev = gdma_dma_chan_get_dev(chan);
- unsigned long flags, timeout;
- LIST_HEAD(head);
- int i = 0;
-
- spin_lock_irqsave(&chan->vchan.lock, flags);
- chan->desc = NULL;
- clear_bit(chan->id, &dma_dev->chan_issued);
- vchan_get_all_descriptors(&chan->vchan, &head);
- spin_unlock_irqrestore(&chan->vchan.lock, flags);
-
- vchan_dma_desc_free_list(&chan->vchan, &head);
-
- /* wait dma transfer complete */
- timeout = jiffies + msecs_to_jiffies(5000);
- while (gdma_dma_read(dma_dev, GDMA_REG_CTRL0(chan->id)) &
- GDMA_REG_CTRL0_ENABLE) {
- if (time_after_eq(jiffies, timeout)) {
- dev_err(dma_dev->ddev.dev, "chan %d wait timeout\n",
- chan->id);
- /* restore to init value */
- gdma_dma_write(dma_dev, GDMA_REG_CTRL0(chan->id), 0);
- break;
- }
- cpu_relax();
- i++;
- }
-
- if (i)
- dev_dbg(dma_dev->ddev.dev, "terminate chan %d loops %d\n",
- chan->id, i);
-
- return 0;
-}
-
-static void rt305x_dump_reg(struct gdma_dma_dev *dma_dev, int id)
-{
- dev_dbg(dma_dev->ddev.dev, "chan %d, src %08x, dst %08x, ctr0 %08x, ctr1 %08x, intr %08x, signal %08x\n",
- id,
- gdma_dma_read(dma_dev, GDMA_REG_SRC_ADDR(id)),
- gdma_dma_read(dma_dev, GDMA_REG_DST_ADDR(id)),
- gdma_dma_read(dma_dev, GDMA_REG_CTRL0(id)),
- gdma_dma_read(dma_dev, GDMA_REG_CTRL1(id)),
- gdma_dma_read(dma_dev, GDMA_RT305X_STATUS_INT),
- gdma_dma_read(dma_dev, GDMA_RT305X_STATUS_SIGNAL));
-}
-
-static int rt305x_gdma_start_transfer(struct gdma_dmaengine_chan *chan)
-{
- struct gdma_dma_dev *dma_dev = gdma_dma_chan_get_dev(chan);
- dma_addr_t src_addr, dst_addr;
- struct gdma_dma_sg *sg;
- u32 ctrl0, ctrl1;
-
- /* verify chan is already stopped */
- ctrl0 = gdma_dma_read(dma_dev, GDMA_REG_CTRL0(chan->id));
- if (unlikely(ctrl0 & GDMA_REG_CTRL0_ENABLE)) {
- dev_err(dma_dev->ddev.dev, "chan %d is start(%08x).\n",
- chan->id, ctrl0);
- rt305x_dump_reg(dma_dev, chan->id);
- return -EINVAL;
- }
-
- sg = &chan->desc->sg[chan->next_sg];
- if (chan->desc->direction == DMA_MEM_TO_DEV) {
- src_addr = sg->src_addr;
- dst_addr = chan->fifo_addr;
- ctrl0 = GDMA_REG_CTRL0_DST_ADDR_FIXED |
- (8 << GDMA_RT305X_CTRL0_SRC_REQ_SHIFT) |
- (chan->slave_id << GDMA_RT305X_CTRL0_DST_REQ_SHIFT);
- } else if (chan->desc->direction == DMA_DEV_TO_MEM) {
- src_addr = chan->fifo_addr;
- dst_addr = sg->dst_addr;
- ctrl0 = GDMA_REG_CTRL0_SRC_ADDR_FIXED |
- (chan->slave_id << GDMA_RT305X_CTRL0_SRC_REQ_SHIFT) |
- (8 << GDMA_RT305X_CTRL0_DST_REQ_SHIFT);
- } else if (chan->desc->direction == DMA_MEM_TO_MEM) {
- /*
- * TODO: memcpy function have bugs. sometime it will copy
- * more 8 bytes data when using dmatest verify.
- */
- src_addr = sg->src_addr;
- dst_addr = sg->dst_addr;
- ctrl0 = GDMA_REG_CTRL0_SW_MODE |
- (8 << GDMA_REG_CTRL1_SRC_REQ_SHIFT) |
- (8 << GDMA_REG_CTRL1_DST_REQ_SHIFT);
- } else {
- dev_err(dma_dev->ddev.dev, "direction type %d error\n",
- chan->desc->direction);
- return -EINVAL;
- }
-
- ctrl0 |= (sg->len << GDMA_REG_CTRL0_TX_SHIFT) |
- (chan->burst_size << GDMA_REG_CTRL0_BURST_SHIFT) |
- GDMA_REG_CTRL0_DONE_INT | GDMA_REG_CTRL0_ENABLE;
- ctrl1 = chan->id << GDMA_REG_CTRL1_NEXT_SHIFT;
-
- chan->next_sg++;
- gdma_dma_write(dma_dev, GDMA_REG_SRC_ADDR(chan->id), src_addr);
- gdma_dma_write(dma_dev, GDMA_REG_DST_ADDR(chan->id), dst_addr);
- gdma_dma_write(dma_dev, GDMA_REG_CTRL1(chan->id), ctrl1);
-
- /* make sure next_sg is update */
- wmb();
- gdma_dma_write(dma_dev, GDMA_REG_CTRL0(chan->id), ctrl0);
-
- return 0;
-}
-
-static void rt3883_dump_reg(struct gdma_dma_dev *dma_dev, int id)
-{
- dev_dbg(dma_dev->ddev.dev, "chan %d, src %08x, dst %08x, ctr0 %08x, ctr1 %08x, unmask %08x, done %08x, req %08x, ack %08x, fin %08x\n",
- id,
- gdma_dma_read(dma_dev, GDMA_REG_SRC_ADDR(id)),
- gdma_dma_read(dma_dev, GDMA_REG_DST_ADDR(id)),
- gdma_dma_read(dma_dev, GDMA_REG_CTRL0(id)),
- gdma_dma_read(dma_dev, GDMA_REG_CTRL1(id)),
- gdma_dma_read(dma_dev, GDMA_REG_UNMASK_INT),
- gdma_dma_read(dma_dev, GDMA_REG_DONE_INT),
- gdma_dma_read(dma_dev, GDMA_REG_REQSTS),
- gdma_dma_read(dma_dev, GDMA_REG_ACKSTS),
- gdma_dma_read(dma_dev, GDMA_REG_FINSTS));
-}
-
-static int rt3883_gdma_start_transfer(struct gdma_dmaengine_chan *chan)
-{
- struct gdma_dma_dev *dma_dev = gdma_dma_chan_get_dev(chan);
- dma_addr_t src_addr, dst_addr;
- struct gdma_dma_sg *sg;
- u32 ctrl0, ctrl1;
-
- /* verify chan is already stopped */
- ctrl0 = gdma_dma_read(dma_dev, GDMA_REG_CTRL0(chan->id));
- if (unlikely(ctrl0 & GDMA_REG_CTRL0_ENABLE)) {
- dev_err(dma_dev->ddev.dev, "chan %d is start(%08x).\n",
- chan->id, ctrl0);
- rt3883_dump_reg(dma_dev, chan->id);
- return -EINVAL;
- }
-
- sg = &chan->desc->sg[chan->next_sg];
- if (chan->desc->direction == DMA_MEM_TO_DEV) {
- src_addr = sg->src_addr;
- dst_addr = chan->fifo_addr;
- ctrl0 = GDMA_REG_CTRL0_DST_ADDR_FIXED;
- ctrl1 = (32 << GDMA_REG_CTRL1_SRC_REQ_SHIFT) |
- (chan->slave_id << GDMA_REG_CTRL1_DST_REQ_SHIFT);
- } else if (chan->desc->direction == DMA_DEV_TO_MEM) {
- src_addr = chan->fifo_addr;
- dst_addr = sg->dst_addr;
- ctrl0 = GDMA_REG_CTRL0_SRC_ADDR_FIXED;
- ctrl1 = (chan->slave_id << GDMA_REG_CTRL1_SRC_REQ_SHIFT) |
- (32 << GDMA_REG_CTRL1_DST_REQ_SHIFT) |
- GDMA_REG_CTRL1_COHERENT;
- } else if (chan->desc->direction == DMA_MEM_TO_MEM) {
- src_addr = sg->src_addr;
- dst_addr = sg->dst_addr;
- ctrl0 = GDMA_REG_CTRL0_SW_MODE;
- ctrl1 = (32 << GDMA_REG_CTRL1_SRC_REQ_SHIFT) |
- (32 << GDMA_REG_CTRL1_DST_REQ_SHIFT) |
- GDMA_REG_CTRL1_COHERENT;
- } else {
- dev_err(dma_dev->ddev.dev, "direction type %d error\n",
- chan->desc->direction);
- return -EINVAL;
- }
-
- ctrl0 |= (sg->len << GDMA_REG_CTRL0_TX_SHIFT) |
- (chan->burst_size << GDMA_REG_CTRL0_BURST_SHIFT) |
- GDMA_REG_CTRL0_DONE_INT | GDMA_REG_CTRL0_ENABLE;
- ctrl1 |= chan->id << GDMA_REG_CTRL1_NEXT_SHIFT;
-
- chan->next_sg++;
- gdma_dma_write(dma_dev, GDMA_REG_SRC_ADDR(chan->id), src_addr);
- gdma_dma_write(dma_dev, GDMA_REG_DST_ADDR(chan->id), dst_addr);
- gdma_dma_write(dma_dev, GDMA_REG_CTRL1(chan->id), ctrl1);
-
- /* make sure next_sg is update */
- wmb();
- gdma_dma_write(dma_dev, GDMA_REG_CTRL0(chan->id), ctrl0);
-
- return 0;
-}
-
-static inline int gdma_start_transfer(struct gdma_dma_dev *dma_dev,
- struct gdma_dmaengine_chan *chan)
-{
- return dma_dev->data->start_transfer(chan);
-}
-
-static int gdma_next_desc(struct gdma_dmaengine_chan *chan)
-{
- struct virt_dma_desc *vdesc;
-
- vdesc = vchan_next_desc(&chan->vchan);
- if (!vdesc) {
- chan->desc = NULL;
- return 0;
- }
- chan->desc = to_gdma_dma_desc(vdesc);
- chan->next_sg = 0;
-
- return 1;
-}
-
-static void gdma_dma_chan_irq(struct gdma_dma_dev *dma_dev,
- struct gdma_dmaengine_chan *chan)
-{
- struct gdma_dma_desc *desc;
- unsigned long flags;
- int chan_issued;
-
- chan_issued = 0;
- spin_lock_irqsave(&chan->vchan.lock, flags);
- desc = chan->desc;
- if (desc) {
- if (desc->cyclic) {
- vchan_cyclic_callback(&desc->vdesc);
- if (chan->next_sg == desc->num_sgs)
- chan->next_sg = 0;
- chan_issued = 1;
- } else {
- desc->residue -= desc->sg[chan->next_sg - 1].len;
- if (chan->next_sg == desc->num_sgs) {
- list_del(&desc->vdesc.node);
- vchan_cookie_complete(&desc->vdesc);
- chan_issued = gdma_next_desc(chan);
- } else {
- chan_issued = 1;
- }
- }
- } else {
- dev_dbg(dma_dev->ddev.dev, "chan %d no desc to complete\n",
- chan->id);
- }
- if (chan_issued)
- set_bit(chan->id, &dma_dev->chan_issued);
- spin_unlock_irqrestore(&chan->vchan.lock, flags);
-}
-
-static irqreturn_t gdma_dma_irq(int irq, void *devid)
-{
- struct gdma_dma_dev *dma_dev = devid;
- u32 done, done_reg;
- unsigned int i;
-
- done_reg = dma_dev->data->done_int_reg;
- done = gdma_dma_read(dma_dev, done_reg);
- if (unlikely(!done))
- return IRQ_NONE;
-
- /* clean done bits */
- gdma_dma_write(dma_dev, done_reg, done);
-
- i = 0;
- while (done) {
- if (done & 0x1) {
- gdma_dma_chan_irq(dma_dev, &dma_dev->chan[i]);
- atomic_dec(&dma_dev->cnt);
- }
- done >>= 1;
- i++;
- }
-
- /* start only have work to do */
- if (dma_dev->chan_issued)
- tasklet_schedule(&dma_dev->task);
-
- return IRQ_HANDLED;
-}
-
-static void gdma_dma_issue_pending(struct dma_chan *c)
-{
- struct gdma_dmaengine_chan *chan = to_gdma_dma_chan(c);
- struct gdma_dma_dev *dma_dev = gdma_dma_chan_get_dev(chan);
- unsigned long flags;
-
- spin_lock_irqsave(&chan->vchan.lock, flags);
- if (vchan_issue_pending(&chan->vchan) && !chan->desc) {
- if (gdma_next_desc(chan)) {
- set_bit(chan->id, &dma_dev->chan_issued);
- tasklet_schedule(&dma_dev->task);
- } else {
- dev_dbg(dma_dev->ddev.dev, "chan %d no desc to issue\n",
- chan->id);
- }
- }
- spin_unlock_irqrestore(&chan->vchan.lock, flags);
-}
-
-static struct dma_async_tx_descriptor *gdma_dma_prep_slave_sg(
- struct dma_chan *c, struct scatterlist *sgl,
- unsigned int sg_len, enum dma_transfer_direction direction,
- unsigned long flags, void *context)
-{
- struct gdma_dmaengine_chan *chan = to_gdma_dma_chan(c);
- struct gdma_dma_desc *desc;
- struct scatterlist *sg;
- unsigned int i;
-
- desc = kzalloc(struct_size(desc, sg, sg_len), GFP_ATOMIC);
- if (!desc) {
- dev_err(c->device->dev, "alloc sg decs error\n");
- return NULL;
- }
- desc->residue = 0;
-
- for_each_sg(sgl, sg, sg_len, i) {
- if (direction == DMA_MEM_TO_DEV) {
- desc->sg[i].src_addr = sg_dma_address(sg);
- } else if (direction == DMA_DEV_TO_MEM) {
- desc->sg[i].dst_addr = sg_dma_address(sg);
- } else {
- dev_err(c->device->dev, "direction type %d error\n",
- direction);
- goto free_desc;
- }
-
- if (unlikely(sg_dma_len(sg) > GDMA_REG_CTRL0_TX_MASK)) {
- dev_err(c->device->dev, "sg len too large %d\n",
- sg_dma_len(sg));
- goto free_desc;
- }
- desc->sg[i].len = sg_dma_len(sg);
- desc->residue += sg_dma_len(sg);
- }
-
- desc->num_sgs = sg_len;
- desc->direction = direction;
- desc->cyclic = false;
-
- return vchan_tx_prep(&chan->vchan, &desc->vdesc, flags);
-
-free_desc:
- kfree(desc);
- return NULL;
-}
-
-static struct dma_async_tx_descriptor *gdma_dma_prep_dma_memcpy(
- struct dma_chan *c, dma_addr_t dest, dma_addr_t src,
- size_t len, unsigned long flags)
-{
- struct gdma_dmaengine_chan *chan = to_gdma_dma_chan(c);
- struct gdma_dma_desc *desc;
- unsigned int num_periods, i;
- size_t xfer_count;
-
- if (len <= 0)
- return NULL;
-
- chan->burst_size = gdma_dma_maxburst(len >> 2);
-
- xfer_count = GDMA_REG_CTRL0_TX_MASK;
- num_periods = DIV_ROUND_UP(len, xfer_count);
-
- desc = kzalloc(struct_size(desc, sg, num_periods), GFP_ATOMIC);
- if (!desc) {
- dev_err(c->device->dev, "alloc memcpy decs error\n");
- return NULL;
- }
- desc->residue = len;
-
- for (i = 0; i < num_periods; i++) {
- desc->sg[i].src_addr = src;
- desc->sg[i].dst_addr = dest;
- if (len > xfer_count)
- desc->sg[i].len = xfer_count;
- else
- desc->sg[i].len = len;
- src += desc->sg[i].len;
- dest += desc->sg[i].len;
- len -= desc->sg[i].len;
- }
-
- desc->num_sgs = num_periods;
- desc->direction = DMA_MEM_TO_MEM;
- desc->cyclic = false;
-
- return vchan_tx_prep(&chan->vchan, &desc->vdesc, flags);
-}
-
-static struct dma_async_tx_descriptor *gdma_dma_prep_dma_cyclic(
- struct dma_chan *c, dma_addr_t buf_addr, size_t buf_len,
- size_t period_len, enum dma_transfer_direction direction,
- unsigned long flags)
-{
- struct gdma_dmaengine_chan *chan = to_gdma_dma_chan(c);
- struct gdma_dma_desc *desc;
- unsigned int num_periods, i;
-
- if (buf_len % period_len)
- return NULL;
-
- if (period_len > GDMA_REG_CTRL0_TX_MASK) {
- dev_err(c->device->dev, "cyclic len too large %d\n",
- period_len);
- return NULL;
- }
-
- num_periods = buf_len / period_len;
- desc = kzalloc(struct_size(desc, sg, num_periods), GFP_ATOMIC);
- if (!desc) {
- dev_err(c->device->dev, "alloc cyclic decs error\n");
- return NULL;
- }
- desc->residue = buf_len;
-
- for (i = 0; i < num_periods; i++) {
- if (direction == DMA_MEM_TO_DEV) {
- desc->sg[i].src_addr = buf_addr;
- } else if (direction == DMA_DEV_TO_MEM) {
- desc->sg[i].dst_addr = buf_addr;
- } else {
- dev_err(c->device->dev, "direction type %d error\n",
- direction);
- goto free_desc;
- }
- desc->sg[i].len = period_len;
- buf_addr += period_len;
- }
-
- desc->num_sgs = num_periods;
- desc->direction = direction;
- desc->cyclic = true;
-
- return vchan_tx_prep(&chan->vchan, &desc->vdesc, flags);
-
-free_desc:
- kfree(desc);
- return NULL;
-}
-
-static enum dma_status gdma_dma_tx_status(struct dma_chan *c,
- dma_cookie_t cookie,
- struct dma_tx_state *state)
-{
- struct gdma_dmaengine_chan *chan = to_gdma_dma_chan(c);
- struct virt_dma_desc *vdesc;
- enum dma_status status;
- unsigned long flags;
- struct gdma_dma_desc *desc;
-
- status = dma_cookie_status(c, cookie, state);
- if (status == DMA_COMPLETE || !state)
- return status;
-
- spin_lock_irqsave(&chan->vchan.lock, flags);
- desc = chan->desc;
- if (desc && (cookie == desc->vdesc.tx.cookie)) {
- /*
- * We never update edesc->residue in the cyclic case, so we
- * can tell the remaining room to the end of the circular
- * buffer.
- */
- if (desc->cyclic)
- state->residue = desc->residue -
- ((chan->next_sg - 1) * desc->sg[0].len);
- else
- state->residue = desc->residue;
- } else {
- vdesc = vchan_find_desc(&chan->vchan, cookie);
- if (vdesc)
- state->residue = to_gdma_dma_desc(vdesc)->residue;
- }
- spin_unlock_irqrestore(&chan->vchan.lock, flags);
-
- dev_dbg(c->device->dev, "tx residue %d bytes\n", state->residue);
-
- return status;
-}
-
-static void gdma_dma_free_chan_resources(struct dma_chan *c)
-{
- vchan_free_chan_resources(to_virt_chan(c));
-}
-
-static void gdma_dma_desc_free(struct virt_dma_desc *vdesc)
-{
- kfree(container_of(vdesc, struct gdma_dma_desc, vdesc));
-}
-
-static void gdma_dma_tasklet(struct tasklet_struct *t)
-{
- struct gdma_dma_dev *dma_dev = from_tasklet(dma_dev, t, task);
- struct gdma_dmaengine_chan *chan;
- static unsigned int last_chan;
- unsigned int i, chan_mask;
-
- /* record last chan to round robin all chans */
- i = last_chan;
- chan_mask = dma_dev->data->chancnt - 1;
- do {
- /*
- * on mt7621. when verify with dmatest with all
- * channel is enable. we need to limit only two
- * channel is working at the same time. otherwise the
- * data will have problem.
- */
- if (atomic_read(&dma_dev->cnt) >= 2) {
- last_chan = i;
- break;
- }
-
- if (test_and_clear_bit(i, &dma_dev->chan_issued)) {
- chan = &dma_dev->chan[i];
- if (chan->desc) {
- atomic_inc(&dma_dev->cnt);
- gdma_start_transfer(dma_dev, chan);
- } else {
- dev_dbg(dma_dev->ddev.dev,
- "chan %d no desc to issue\n",
- chan->id);
- }
- if (!dma_dev->chan_issued)
- break;
- }
-
- i = (i + 1) & chan_mask;
- } while (i != last_chan);
-}
-
-static void rt305x_gdma_init(struct gdma_dma_dev *dma_dev)
-{
- u32 gct;
-
- /* all chans round robin */
- gdma_dma_write(dma_dev, GDMA_RT305X_GCT, GDMA_REG_GCT_ARBIT_RR);
-
- gct = gdma_dma_read(dma_dev, GDMA_RT305X_GCT);
- dev_info(dma_dev->ddev.dev, "revision: %d, channels: %d\n",
- (gct >> GDMA_REG_GCT_VER_SHIFT) & GDMA_REG_GCT_VER_MASK,
- 8 << ((gct >> GDMA_REG_GCT_CHAN_SHIFT) &
- GDMA_REG_GCT_CHAN_MASK));
-}
-
-static void rt3883_gdma_init(struct gdma_dma_dev *dma_dev)
-{
- u32 gct;
-
- /* all chans round robin */
- gdma_dma_write(dma_dev, GDMA_REG_GCT, GDMA_REG_GCT_ARBIT_RR);
-
- gct = gdma_dma_read(dma_dev, GDMA_REG_GCT);
- dev_info(dma_dev->ddev.dev, "revision: %d, channels: %d\n",
- (gct >> GDMA_REG_GCT_VER_SHIFT) & GDMA_REG_GCT_VER_MASK,
- 8 << ((gct >> GDMA_REG_GCT_CHAN_SHIFT) &
- GDMA_REG_GCT_CHAN_MASK));
-}
-
-static struct gdma_data rt305x_gdma_data = {
- .chancnt = 8,
- .done_int_reg = GDMA_RT305X_STATUS_INT,
- .init = rt305x_gdma_init,
- .start_transfer = rt305x_gdma_start_transfer,
-};
-
-static struct gdma_data rt3883_gdma_data = {
- .chancnt = 16,
- .done_int_reg = GDMA_REG_DONE_INT,
- .init = rt3883_gdma_init,
- .start_transfer = rt3883_gdma_start_transfer,
-};
-
-static const struct of_device_id gdma_of_match_table[] = {
- { .compatible = "ralink,rt305x-gdma", .data = &rt305x_gdma_data },
- { .compatible = "ralink,rt3883-gdma", .data = &rt3883_gdma_data },
- { },
-};
-MODULE_DEVICE_TABLE(of, gdma_of_match_table);
-
-static int gdma_dma_probe(struct platform_device *pdev)
-{
- const struct of_device_id *match;
- struct gdma_dmaengine_chan *chan;
- struct gdma_dma_dev *dma_dev;
- struct dma_device *dd;
- unsigned int i;
- int ret;
- int irq;
- void __iomem *base;
- struct gdma_data *data;
-
- ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
- if (ret)
- return ret;
-
- match = of_match_device(gdma_of_match_table, &pdev->dev);
- if (!match)
- return -EINVAL;
- data = (struct gdma_data *)match->data;
-
- dma_dev = devm_kzalloc(&pdev->dev,
- struct_size(dma_dev, chan, data->chancnt),
- GFP_KERNEL);
- if (!dma_dev)
- return -EINVAL;
- dma_dev->data = data;
-
- base = devm_platform_ioremap_resource(pdev, 0);
- if (IS_ERR(base))
- return PTR_ERR(base);
- dma_dev->base = base;
- tasklet_setup(&dma_dev->task, gdma_dma_tasklet);
-
- irq = platform_get_irq(pdev, 0);
- if (irq < 0)
- return -EINVAL;
- ret = devm_request_irq(&pdev->dev, irq, gdma_dma_irq,
- 0, dev_name(&pdev->dev), dma_dev);
- if (ret) {
- dev_err(&pdev->dev, "failed to request irq\n");
- return ret;
- }
-
- ret = device_reset(&pdev->dev);
- if (ret)
- dev_err(&pdev->dev, "failed to reset: %d\n", ret);
-
- dd = &dma_dev->ddev;
- dma_cap_set(DMA_MEMCPY, dd->cap_mask);
- dma_cap_set(DMA_SLAVE, dd->cap_mask);
- dma_cap_set(DMA_CYCLIC, dd->cap_mask);
- dd->device_free_chan_resources = gdma_dma_free_chan_resources;
- dd->device_prep_dma_memcpy = gdma_dma_prep_dma_memcpy;
- dd->device_prep_slave_sg = gdma_dma_prep_slave_sg;
- dd->device_prep_dma_cyclic = gdma_dma_prep_dma_cyclic;
- dd->device_config = gdma_dma_config;
- dd->device_terminate_all = gdma_dma_terminate_all;
- dd->device_tx_status = gdma_dma_tx_status;
- dd->device_issue_pending = gdma_dma_issue_pending;
-
- dd->src_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_4_BYTES);
- dd->dst_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_4_BYTES);
- dd->directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV);
- dd->residue_granularity = DMA_RESIDUE_GRANULARITY_SEGMENT;
-
- dd->dev = &pdev->dev;
- dd->dev->dma_parms = &dma_dev->dma_parms;
- dma_set_max_seg_size(dd->dev, GDMA_REG_CTRL0_TX_MASK);
- INIT_LIST_HEAD(&dd->channels);
-
- for (i = 0; i < data->chancnt; i++) {
- chan = &dma_dev->chan[i];
- chan->id = i;
- chan->vchan.desc_free = gdma_dma_desc_free;
- vchan_init(&chan->vchan, dd);
- }
-
- /* init hardware */
- data->init(dma_dev);
-
- ret = dma_async_device_register(dd);
- if (ret) {
- dev_err(&pdev->dev, "failed to register dma device\n");
- return ret;
- }
-
- ret = of_dma_controller_register(pdev->dev.of_node,
- of_dma_xlate_by_chan_id, dma_dev);
- if (ret) {
- dev_err(&pdev->dev, "failed to register of dma controller\n");
- goto err_unregister;
- }
-
- platform_set_drvdata(pdev, dma_dev);
-
- return 0;
-
-err_unregister:
- dma_async_device_unregister(dd);
- return ret;
-}
-
-static int gdma_dma_remove(struct platform_device *pdev)
-{
- struct gdma_dma_dev *dma_dev = platform_get_drvdata(pdev);
-
- tasklet_kill(&dma_dev->task);
- of_dma_controller_free(pdev->dev.of_node);
- dma_async_device_unregister(&dma_dev->ddev);
-
- return 0;
-}
-
-static struct platform_driver gdma_dma_driver = {
- .probe = gdma_dma_probe,
- .remove = gdma_dma_remove,
- .driver = {
- .name = "gdma-rt2880",
- .of_match_table = gdma_of_match_table,
- },
-};
-module_platform_driver(gdma_dma_driver);
-
-MODULE_DESCRIPTION("Ralink/MTK DMA driver");
-MODULE_LICENSE("GPL v2");
projects / linux-stable / commitdiff