aboutsummaryrefslogtreecommitdiffstats
path: root/target/linux/ramips/patches-5.4/0047-DMA-ralink-add-rt2880-dma-engine.patch
diff options
context:
space:
mode:
Diffstat (limited to 'target/linux/ramips/patches-5.4/0047-DMA-ralink-add-rt2880-dma-engine.patch')
-rw-r--r--target/linux/ramips/patches-5.4/0047-DMA-ralink-add-rt2880-dma-engine.patch1757
1 files changed, 0 insertions, 1757 deletions
diff --git a/target/linux/ramips/patches-5.4/0047-DMA-ralink-add-rt2880-dma-engine.patch b/target/linux/ramips/patches-5.4/0047-DMA-ralink-add-rt2880-dma-engine.patch
deleted file mode 100644
index b74a48a220..0000000000
--- a/target/linux/ramips/patches-5.4/0047-DMA-ralink-add-rt2880-dma-engine.patch
+++ /dev/null
@@ -1,1757 +0,0 @@
-From f1c4d9e622c800e1f38b3818f933ec7597d1ccfb Mon Sep 17 00:00:00 2001
-From: John Crispin <blogic@openwrt.org>
-Date: Sun, 27 Jul 2014 09:29:51 +0100
-Subject: [PATCH 47/53] DMA: ralink: add rt2880 dma engine
-
-Signed-off-by: John Crispin <blogic@openwrt.org>
----
- drivers/dma/Kconfig | 6 +
- drivers/dma/Makefile | 1 +
- drivers/dma/ralink-gdma.c | 577 +++++++++++++++++++++++++++++++++++++++++++++
- include/linux/dmaengine.h | 1 +
- 4 files changed, 585 insertions(+)
- create mode 100644 drivers/dma/ralink-gdma.c
-
---- a/drivers/dma/Kconfig
-+++ b/drivers/dma/Kconfig
-@@ -40,6 +40,18 @@ config ASYNC_TX_ENABLE_CHANNEL_SWITCH
- config ARCH_HAS_ASYNC_TX_FIND_CHANNEL
- bool
-
-+config DMA_RALINK
-+ tristate "RALINK DMA support"
-+ depends on RALINK && !SOC_RT288X
-+ select DMA_ENGINE
-+ select DMA_VIRTUAL_CHANNELS
-+
-+config MTK_HSDMA
-+ tristate "MTK HSDMA support"
-+ depends on RALINK && SOC_MT7621
-+ select DMA_ENGINE
-+ select DMA_VIRTUAL_CHANNELS
-+
- config DMA_ENGINE
- bool
-
---- a/drivers/dma/Makefile
-+++ b/drivers/dma/Makefile
-@@ -71,6 +71,8 @@ obj-$(CONFIG_TI_EDMA) += edma.o
- obj-$(CONFIG_XGENE_DMA) += xgene-dma.o
- obj-$(CONFIG_ZX_DMA) += zx_dma.o
- obj-$(CONFIG_ST_FDMA) += st_fdma.o
-+obj-$(CONFIG_DMA_RALINK) += ralink-gdma.o
-+obj-$(CONFIG_MTK_HSDMA) += mtk-hsdma.o
-
- obj-y += qcom/
- obj-y += xilinx/
---- /dev/null
-+++ b/drivers/dma/ralink-gdma.c
-@@ -0,0 +1,928 @@
-+/*
-+ * Copyright (C) 2013, Lars-Peter Clausen <lars@metafoo.de>
-+ * GDMA4740 DMAC support
-+ *
-+ * 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/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_CONTINOUS BIT(14)
-+#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 reg, uint32_t val)
-+{
-+ writel(val, dma_dev->base + reg);
-+}
-+
-+static struct gdma_dma_desc *gdma_dma_alloc_desc(unsigned int num_sgs)
-+{
-+ return kzalloc(sizeof(struct gdma_dma_desc) +
-+ sizeof(struct gdma_dma_sg) * num_sgs, GFP_ATOMIC);
-+}
-+
-+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;
-+ uint32_t 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;
-+ uint32_t 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 = gdma_dma_alloc_desc(sg_len);
-+ 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 = gdma_dma_alloc_desc(num_periods);
-+ 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 = gdma_dma_alloc_desc(num_periods);
-+ 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 if ((vdesc = vchan_find_desc(&chan->vchan, cookie)))
-+ 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(unsigned long arg)
-+{
-+ struct gdma_dma_dev *dma_dev = (struct gdma_dma_dev *)arg;
-+ 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)
-+{
-+ uint32_t 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)
-+{
-+ uint32_t 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 },
-+ { },
-+};
-+
-+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;
-+ struct resource *res;
-+ 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, sizeof(*dma_dev) +
-+ (sizeof(struct gdma_dmaengine_chan) * data->chancnt),
-+ GFP_KERNEL);
-+ if (!dma_dev) {
-+ dev_err(&pdev->dev, "alloc dma device failed\n");
-+ return -EINVAL;
-+ }
-+ dma_dev->data = data;
-+
-+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-+ base = devm_ioremap_resource(&pdev->dev, res);
-+ if (IS_ERR(base))
-+ return PTR_ERR(base);
-+ dma_dev->base = base;
-+ tasklet_init(&dma_dev->task, gdma_dma_tasklet, (unsigned long)dma_dev);
-+
-+ irq = platform_get_irq(pdev, 0);
-+ if (irq < 0) {
-+ dev_err(&pdev->dev, "failed to get irq\n");
-+ 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;
-+ }
-+
-+ device_reset(&pdev->dev);
-+
-+ 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_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
-+MODULE_DESCRIPTION("Ralink/MTK DMA driver");
-+MODULE_LICENSE("GPL v2");
---- a/include/linux/dmaengine.h
-+++ b/include/linux/dmaengine.h
-@@ -525,6 +525,7 @@ static inline void dma_set_unmap(struct
- struct dmaengine_unmap_data *
- dmaengine_get_unmap_data(struct device *dev, int nr, gfp_t flags);
- void dmaengine_unmap_put(struct dmaengine_unmap_data *unmap);
-+struct dma_chan *dma_get_slave_channel(struct dma_chan *chan);
- #else
- static inline void dma_set_unmap(struct dma_async_tx_descriptor *tx,
- struct dmaengine_unmap_data *unmap)
---- /dev/null
-+++ b/drivers/dma/mtk-hsdma.c
-@@ -0,0 +1,767 @@
-+/*
-+ * Copyright (C) 2015, Michael Lee <igvtee@gmail.com>
-+ * MTK HSDMA support
-+ *
-+ * 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/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 HSDMA_BASE_OFFSET 0x800
-+
-+#define HSDMA_REG_TX_BASE 0x00
-+#define HSDMA_REG_TX_CNT 0x04
-+#define HSDMA_REG_TX_CTX 0x08
-+#define HSDMA_REG_TX_DTX 0x0c
-+#define HSDMA_REG_RX_BASE 0x100
-+#define HSDMA_REG_RX_CNT 0x104
-+#define HSDMA_REG_RX_CRX 0x108
-+#define HSDMA_REG_RX_DRX 0x10c
-+#define HSDMA_REG_INFO 0x200
-+#define HSDMA_REG_GLO_CFG 0x204
-+#define HSDMA_REG_RST_CFG 0x208
-+#define HSDMA_REG_DELAY_INT 0x20c
-+#define HSDMA_REG_FREEQ_THRES 0x210
-+#define HSDMA_REG_INT_STATUS 0x220
-+#define HSDMA_REG_INT_MASK 0x228
-+#define HSDMA_REG_SCH_Q01 0x280
-+#define HSDMA_REG_SCH_Q23 0x284
-+
-+#define HSDMA_DESCS_MAX 0xfff
-+#define HSDMA_DESCS_NUM 8
-+#define HSDMA_DESCS_MASK (HSDMA_DESCS_NUM - 1)
-+#define HSDMA_NEXT_DESC(x) (((x) + 1) & HSDMA_DESCS_MASK)
-+
-+/* HSDMA_REG_INFO */
-+#define HSDMA_INFO_INDEX_MASK 0xf
-+#define HSDMA_INFO_INDEX_SHIFT 24
-+#define HSDMA_INFO_BASE_MASK 0xff
-+#define HSDMA_INFO_BASE_SHIFT 16
-+#define HSDMA_INFO_RX_MASK 0xff
-+#define HSDMA_INFO_RX_SHIFT 8
-+#define HSDMA_INFO_TX_MASK 0xff
-+#define HSDMA_INFO_TX_SHIFT 0
-+
-+/* HSDMA_REG_GLO_CFG */
-+#define HSDMA_GLO_TX_2B_OFFSET BIT(31)
-+#define HSDMA_GLO_CLK_GATE BIT(30)
-+#define HSDMA_GLO_BYTE_SWAP BIT(29)
-+#define HSDMA_GLO_MULTI_DMA BIT(10)
-+#define HSDMA_GLO_TWO_BUF BIT(9)
-+#define HSDMA_GLO_32B_DESC BIT(8)
-+#define HSDMA_GLO_BIG_ENDIAN BIT(7)
-+#define HSDMA_GLO_TX_DONE BIT(6)
-+#define HSDMA_GLO_BT_MASK 0x3
-+#define HSDMA_GLO_BT_SHIFT 4
-+#define HSDMA_GLO_RX_BUSY BIT(3)
-+#define HSDMA_GLO_RX_DMA BIT(2)
-+#define HSDMA_GLO_TX_BUSY BIT(1)
-+#define HSDMA_GLO_TX_DMA BIT(0)
-+
-+#define HSDMA_BT_SIZE_16BYTES (0 << HSDMA_GLO_BT_SHIFT)
-+#define HSDMA_BT_SIZE_32BYTES (1 << HSDMA_GLO_BT_SHIFT)
-+#define HSDMA_BT_SIZE_64BYTES (2 << HSDMA_GLO_BT_SHIFT)
-+#define HSDMA_BT_SIZE_128BYTES (3 << HSDMA_GLO_BT_SHIFT)
-+
-+#define HSDMA_GLO_DEFAULT (HSDMA_GLO_MULTI_DMA | \
-+ HSDMA_GLO_RX_DMA | HSDMA_GLO_TX_DMA | HSDMA_BT_SIZE_32BYTES)
-+
-+/* HSDMA_REG_RST_CFG */
-+#define HSDMA_RST_RX_SHIFT 16
-+#define HSDMA_RST_TX_SHIFT 0
-+
-+/* HSDMA_REG_DELAY_INT */
-+#define HSDMA_DELAY_INT_EN BIT(15)
-+#define HSDMA_DELAY_PEND_OFFSET 8
-+#define HSDMA_DELAY_TIME_OFFSET 0
-+#define HSDMA_DELAY_TX_OFFSET 16
-+#define HSDMA_DELAY_RX_OFFSET 0
-+
-+#define HSDMA_DELAY_INIT(x) (HSDMA_DELAY_INT_EN | \
-+ ((x) << HSDMA_DELAY_PEND_OFFSET))
-+#define HSDMA_DELAY(x) ((HSDMA_DELAY_INIT(x) << \
-+ HSDMA_DELAY_TX_OFFSET) | HSDMA_DELAY_INIT(x))
-+
-+/* HSDMA_REG_INT_STATUS */
-+#define HSDMA_INT_DELAY_RX_COH BIT(31)
-+#define HSDMA_INT_DELAY_RX_INT BIT(30)
-+#define HSDMA_INT_DELAY_TX_COH BIT(29)
-+#define HSDMA_INT_DELAY_TX_INT BIT(28)
-+#define HSDMA_INT_RX_MASK 0x3
-+#define HSDMA_INT_RX_SHIFT 16
-+#define HSDMA_INT_RX_Q0 BIT(16)
-+#define HSDMA_INT_TX_MASK 0xf
-+#define HSDMA_INT_TX_SHIFT 0
-+#define HSDMA_INT_TX_Q0 BIT(0)
-+
-+/* tx/rx dma desc flags */
-+#define HSDMA_PLEN_MASK 0x3fff
-+#define HSDMA_DESC_DONE BIT(31)
-+#define HSDMA_DESC_LS0 BIT(30)
-+#define HSDMA_DESC_PLEN0(_x) (((_x) & HSDMA_PLEN_MASK) << 16)
-+#define HSDMA_DESC_TAG BIT(15)
-+#define HSDMA_DESC_LS1 BIT(14)
-+#define HSDMA_DESC_PLEN1(_x) ((_x) & HSDMA_PLEN_MASK)
-+
-+/* align 4 bytes */
-+#define HSDMA_ALIGN_SIZE 3
-+/* align size 128bytes */
-+#define HSDMA_MAX_PLEN 0x3f80
-+
-+struct hsdma_desc {
-+ u32 addr0;
-+ u32 flags;
-+ u32 addr1;
-+ u32 unused;
-+};
-+
-+struct mtk_hsdma_sg {
-+ dma_addr_t src_addr;
-+ dma_addr_t dst_addr;
-+ u32 len;
-+};
-+
-+struct mtk_hsdma_desc {
-+ struct virt_dma_desc vdesc;
-+ unsigned int num_sgs;
-+ struct mtk_hsdma_sg sg[1];
-+};
-+
-+struct mtk_hsdma_chan {
-+ struct virt_dma_chan vchan;
-+ unsigned int id;
-+ dma_addr_t desc_addr;
-+ int tx_idx;
-+ int rx_idx;
-+ struct hsdma_desc *tx_ring;
-+ struct hsdma_desc *rx_ring;
-+ struct mtk_hsdma_desc *desc;
-+ unsigned int next_sg;
-+};
-+
-+struct mtk_hsdam_engine {
-+ struct dma_device ddev;
-+ struct device_dma_parameters dma_parms;
-+ void __iomem *base;
-+ struct tasklet_struct task;
-+ volatile unsigned long chan_issued;
-+
-+ struct mtk_hsdma_chan chan[1];
-+};
-+
-+static inline struct mtk_hsdam_engine *mtk_hsdma_chan_get_dev(
-+ struct mtk_hsdma_chan *chan)
-+{
-+ return container_of(chan->vchan.chan.device, struct mtk_hsdam_engine,
-+ ddev);
-+}
-+
-+static inline struct mtk_hsdma_chan *to_mtk_hsdma_chan(struct dma_chan *c)
-+{
-+ return container_of(c, struct mtk_hsdma_chan, vchan.chan);
-+}
-+
-+static inline struct mtk_hsdma_desc *to_mtk_hsdma_desc(
-+ struct virt_dma_desc *vdesc)
-+{
-+ return container_of(vdesc, struct mtk_hsdma_desc, vdesc);
-+}
-+
-+static inline u32 mtk_hsdma_read(struct mtk_hsdam_engine *hsdma, u32 reg)
-+{
-+ return readl(hsdma->base + reg);
-+}
-+
-+static inline void mtk_hsdma_write(struct mtk_hsdam_engine *hsdma,
-+ unsigned reg, u32 val)
-+{
-+ writel(val, hsdma->base + reg);
-+}
-+
-+static void mtk_hsdma_reset_chan(struct mtk_hsdam_engine *hsdma,
-+ struct mtk_hsdma_chan *chan)
-+{
-+ chan->tx_idx = 0;
-+ chan->rx_idx = HSDMA_DESCS_NUM - 1;
-+
-+ mtk_hsdma_write(hsdma, HSDMA_REG_TX_CTX, chan->tx_idx);
-+ mtk_hsdma_write(hsdma, HSDMA_REG_RX_CRX, chan->rx_idx);
-+
-+ mtk_hsdma_write(hsdma, HSDMA_REG_RST_CFG,
-+ 0x1 << (chan->id + HSDMA_RST_TX_SHIFT));
-+ mtk_hsdma_write(hsdma, HSDMA_REG_RST_CFG,
-+ 0x1 << (chan->id + HSDMA_RST_RX_SHIFT));
-+}
-+
-+static void hsdma_dump_reg(struct mtk_hsdam_engine *hsdma)
-+{
-+ dev_dbg(hsdma->ddev.dev, "tbase %08x, tcnt %08x, " \
-+ "tctx %08x, tdtx: %08x, rbase %08x, " \
-+ "rcnt %08x, rctx %08x, rdtx %08x\n",
-+ mtk_hsdma_read(hsdma, HSDMA_REG_TX_BASE),
-+ mtk_hsdma_read(hsdma, HSDMA_REG_TX_CNT),
-+ mtk_hsdma_read(hsdma, HSDMA_REG_TX_CTX),
-+ mtk_hsdma_read(hsdma, HSDMA_REG_TX_DTX),
-+ mtk_hsdma_read(hsdma, HSDMA_REG_RX_BASE),
-+ mtk_hsdma_read(hsdma, HSDMA_REG_RX_CNT),
-+ mtk_hsdma_read(hsdma, HSDMA_REG_RX_CRX),
-+ mtk_hsdma_read(hsdma, HSDMA_REG_RX_DRX));
-+
-+ dev_dbg(hsdma->ddev.dev, "info %08x, glo %08x, delay %08x, " \
-+ "intr_stat %08x, intr_mask %08x\n",
-+ mtk_hsdma_read(hsdma, HSDMA_REG_INFO),
-+ mtk_hsdma_read(hsdma, HSDMA_REG_GLO_CFG),
-+ mtk_hsdma_read(hsdma, HSDMA_REG_DELAY_INT),
-+ mtk_hsdma_read(hsdma, HSDMA_REG_INT_STATUS),
-+ mtk_hsdma_read(hsdma, HSDMA_REG_INT_MASK));
-+}
-+
-+static void hsdma_dump_desc(struct mtk_hsdam_engine *hsdma,
-+ struct mtk_hsdma_chan *chan)
-+{
-+ struct hsdma_desc *tx_desc;
-+ struct hsdma_desc *rx_desc;
-+ int i;
-+
-+ dev_dbg(hsdma->ddev.dev, "tx idx: %d, rx idx: %d\n",
-+ chan->tx_idx, chan->rx_idx);
-+
-+ for (i = 0; i < HSDMA_DESCS_NUM; i++) {
-+ tx_desc = &chan->tx_ring[i];
-+ rx_desc = &chan->rx_ring[i];
-+
-+ dev_dbg(hsdma->ddev.dev, "%d tx addr0: %08x, flags %08x, " \
-+ "tx addr1: %08x, rx addr0 %08x, flags %08x\n",
-+ i, tx_desc->addr0, tx_desc->flags, \
-+ tx_desc->addr1, rx_desc->addr0, rx_desc->flags);
-+ }
-+}
-+
-+static void mtk_hsdma_reset(struct mtk_hsdam_engine *hsdma,
-+ struct mtk_hsdma_chan *chan)
-+{
-+ int i;
-+
-+ /* disable dma */
-+ mtk_hsdma_write(hsdma, HSDMA_REG_GLO_CFG, 0);
-+
-+ /* disable intr */
-+ mtk_hsdma_write(hsdma, HSDMA_REG_INT_MASK, 0);
-+
-+ /* init desc value */
-+ for (i = 0; i < HSDMA_DESCS_NUM; i++) {
-+ chan->tx_ring[i].addr0 = 0;
-+ chan->tx_ring[i].flags = HSDMA_DESC_LS0 |
-+ HSDMA_DESC_DONE;
-+ }
-+ for (i = 0; i < HSDMA_DESCS_NUM; i++) {
-+ chan->rx_ring[i].addr0 = 0;
-+ chan->rx_ring[i].flags = 0;
-+ }
-+
-+ /* reset */
-+ mtk_hsdma_reset_chan(hsdma, chan);
-+
-+ /* enable intr */
-+ mtk_hsdma_write(hsdma, HSDMA_REG_INT_MASK, HSDMA_INT_RX_Q0);
-+
-+ /* enable dma */
-+ mtk_hsdma_write(hsdma, HSDMA_REG_GLO_CFG, HSDMA_GLO_DEFAULT);
-+}
-+
-+static int mtk_hsdma_terminate_all(struct dma_chan *c)
-+{
-+ struct mtk_hsdma_chan *chan = to_mtk_hsdma_chan(c);
-+ struct mtk_hsdam_engine *hsdma = mtk_hsdma_chan_get_dev(chan);
-+ unsigned long timeout;
-+ LIST_HEAD(head);
-+
-+ spin_lock_bh(&chan->vchan.lock);
-+ chan->desc = NULL;
-+ clear_bit(chan->id, &hsdma->chan_issued);
-+ vchan_get_all_descriptors(&chan->vchan, &head);
-+ spin_unlock_bh(&chan->vchan.lock);
-+
-+ vchan_dma_desc_free_list(&chan->vchan, &head);
-+
-+ /* wait dma transfer complete */
-+ timeout = jiffies + msecs_to_jiffies(2000);
-+ while (mtk_hsdma_read(hsdma, HSDMA_REG_GLO_CFG) &
-+ (HSDMA_GLO_RX_BUSY | HSDMA_GLO_TX_BUSY)) {
-+ if (time_after_eq(jiffies, timeout)) {
-+ hsdma_dump_desc(hsdma, chan);
-+ mtk_hsdma_reset(hsdma, chan);
-+ dev_err(hsdma->ddev.dev, "timeout, reset it\n");
-+ break;
-+ }
-+ cpu_relax();
-+ }
-+
-+ return 0;
-+}
-+
-+static int mtk_hsdma_start_transfer(struct mtk_hsdam_engine *hsdma,
-+ struct mtk_hsdma_chan *chan)
-+{
-+ dma_addr_t src, dst;
-+ size_t len, tlen;
-+ struct hsdma_desc *tx_desc, *rx_desc;
-+ struct mtk_hsdma_sg *sg;
-+ unsigned int i;
-+ int rx_idx;
-+
-+ sg = &chan->desc->sg[0];
-+ len = sg->len;
-+ chan->desc->num_sgs = DIV_ROUND_UP(len, HSDMA_MAX_PLEN);
-+
-+ /* tx desc */
-+ src = sg->src_addr;
-+ for (i = 0; i < chan->desc->num_sgs; i++) {
-+ if (len > HSDMA_MAX_PLEN)
-+ tlen = HSDMA_MAX_PLEN;
-+ else
-+ tlen = len;
-+
-+ if (i & 0x1) {
-+ tx_desc->addr1 = src;
-+ tx_desc->flags |= HSDMA_DESC_PLEN1(tlen);
-+ } else {
-+ tx_desc = &chan->tx_ring[chan->tx_idx];
-+ tx_desc->addr0 = src;
-+ tx_desc->flags = HSDMA_DESC_PLEN0(tlen);
-+
-+ /* update index */
-+ chan->tx_idx = HSDMA_NEXT_DESC(chan->tx_idx);
-+ }
-+
-+ src += tlen;
-+ len -= tlen;
-+ }
-+ if (i & 0x1)
-+ tx_desc->flags |= HSDMA_DESC_LS0;
-+ else
-+ tx_desc->flags |= HSDMA_DESC_LS1;
-+
-+ /* rx desc */
-+ rx_idx = HSDMA_NEXT_DESC(chan->rx_idx);
-+ len = sg->len;
-+ dst = sg->dst_addr;
-+ for (i = 0; i < chan->desc->num_sgs; i++) {
-+ rx_desc = &chan->rx_ring[rx_idx];
-+ if (len > HSDMA_MAX_PLEN)
-+ tlen = HSDMA_MAX_PLEN;
-+ else
-+ tlen = len;
-+
-+ rx_desc->addr0 = dst;
-+ rx_desc->flags = HSDMA_DESC_PLEN0(tlen);
-+
-+ dst += tlen;
-+ len -= tlen;
-+
-+ /* update index */
-+ rx_idx = HSDMA_NEXT_DESC(rx_idx);
-+ }
-+
-+ /* make sure desc and index all up to date */
-+ wmb();
-+ mtk_hsdma_write(hsdma, HSDMA_REG_TX_CTX, chan->tx_idx);
-+
-+ return 0;
-+}
-+
-+static int gdma_next_desc(struct mtk_hsdma_chan *chan)
-+{
-+ struct virt_dma_desc *vdesc;
-+
-+ vdesc = vchan_next_desc(&chan->vchan);
-+ if (!vdesc) {
-+ chan->desc = NULL;
-+ return 0;
-+ }
-+ chan->desc = to_mtk_hsdma_desc(vdesc);
-+ chan->next_sg = 0;
-+
-+ return 1;
-+}
-+
-+static void mtk_hsdma_chan_done(struct mtk_hsdam_engine *hsdma,
-+ struct mtk_hsdma_chan *chan)
-+{
-+ struct mtk_hsdma_desc *desc;
-+ int chan_issued;
-+
-+ chan_issued = 0;
-+ spin_lock_bh(&chan->vchan.lock);
-+ desc = chan->desc;
-+ if (likely(desc)) {
-+ if (chan->next_sg == desc->num_sgs) {
-+ list_del(&desc->vdesc.node);
-+ vchan_cookie_complete(&desc->vdesc);
-+ chan_issued = gdma_next_desc(chan);
-+ }
-+ } else
-+ dev_dbg(hsdma->ddev.dev, "no desc to complete\n");
-+
-+ if (chan_issued)
-+ set_bit(chan->id, &hsdma->chan_issued);
-+ spin_unlock_bh(&chan->vchan.lock);
-+}
-+
-+static irqreturn_t mtk_hsdma_irq(int irq, void *devid)
-+{
-+ struct mtk_hsdam_engine *hsdma = devid;
-+ u32 status;
-+
-+ status = mtk_hsdma_read(hsdma, HSDMA_REG_INT_STATUS);
-+ if (unlikely(!status))
-+ return IRQ_NONE;
-+
-+ if (likely(status & HSDMA_INT_RX_Q0))
-+ tasklet_schedule(&hsdma->task);
-+ else
-+ dev_dbg(hsdma->ddev.dev, "unhandle irq status %08x\n",
-+ status);
-+ /* clean intr bits */
-+ mtk_hsdma_write(hsdma, HSDMA_REG_INT_STATUS, status);
-+
-+ return IRQ_HANDLED;
-+}
-+
-+static void mtk_hsdma_issue_pending(struct dma_chan *c)
-+{
-+ struct mtk_hsdma_chan *chan = to_mtk_hsdma_chan(c);
-+ struct mtk_hsdam_engine *hsdma = mtk_hsdma_chan_get_dev(chan);
-+
-+ spin_lock_bh(&chan->vchan.lock);
-+ if (vchan_issue_pending(&chan->vchan) && !chan->desc) {
-+ if (gdma_next_desc(chan)) {
-+ set_bit(chan->id, &hsdma->chan_issued);
-+ tasklet_schedule(&hsdma->task);
-+ } else
-+ dev_dbg(hsdma->ddev.dev, "no desc to issue\n");
-+ }
-+ spin_unlock_bh(&chan->vchan.lock);
-+}
-+
-+static struct dma_async_tx_descriptor * mtk_hsdma_prep_dma_memcpy(
-+ struct dma_chan *c, dma_addr_t dest, dma_addr_t src,
-+ size_t len, unsigned long flags)
-+{
-+ struct mtk_hsdma_chan *chan = to_mtk_hsdma_chan(c);
-+ struct mtk_hsdma_desc *desc;
-+
-+ if (len <= 0)
-+ return NULL;
-+
-+ desc = kzalloc(sizeof(struct mtk_hsdma_desc), GFP_ATOMIC);
-+ if (!desc) {
-+ dev_err(c->device->dev, "alloc memcpy decs error\n");
-+ return NULL;
-+ }
-+
-+ desc->sg[0].src_addr = src;
-+ desc->sg[0].dst_addr = dest;
-+ desc->sg[0].len = len;
-+
-+ return vchan_tx_prep(&chan->vchan, &desc->vdesc, flags);
-+}
-+
-+static enum dma_status mtk_hsdma_tx_status(struct dma_chan *c,
-+ dma_cookie_t cookie, struct dma_tx_state *state)
-+{
-+ return dma_cookie_status(c, cookie, state);
-+}
-+
-+static void mtk_hsdma_free_chan_resources(struct dma_chan *c)
-+{
-+ vchan_free_chan_resources(to_virt_chan(c));
-+}
-+
-+static void mtk_hsdma_desc_free(struct virt_dma_desc *vdesc)
-+{
-+ kfree(container_of(vdesc, struct mtk_hsdma_desc, vdesc));
-+}
-+
-+static void mtk_hsdma_tx(struct mtk_hsdam_engine *hsdma)
-+{
-+ struct mtk_hsdma_chan *chan;
-+
-+ if (test_and_clear_bit(0, &hsdma->chan_issued)) {
-+ chan = &hsdma->chan[0];
-+ if (chan->desc) {
-+ mtk_hsdma_start_transfer(hsdma, chan);
-+ } else
-+ dev_dbg(hsdma->ddev.dev,"chan 0 no desc to issue\n");
-+ }
-+}
-+
-+static void mtk_hsdma_rx(struct mtk_hsdam_engine *hsdma)
-+{
-+ struct mtk_hsdma_chan *chan;
-+ int next_idx, drx_idx, cnt;
-+
-+ chan = &hsdma->chan[0];
-+ next_idx = HSDMA_NEXT_DESC(chan->rx_idx);
-+ drx_idx = mtk_hsdma_read(hsdma, HSDMA_REG_RX_DRX);
-+
-+ cnt = (drx_idx - next_idx) & HSDMA_DESCS_MASK;
-+ if (!cnt)
-+ return;
-+
-+ chan->next_sg += cnt;
-+ chan->rx_idx = (chan->rx_idx + cnt) & HSDMA_DESCS_MASK;
-+
-+ /* update rx crx */
-+ wmb();
-+ mtk_hsdma_write(hsdma, HSDMA_REG_RX_CRX, chan->rx_idx);
-+
-+ mtk_hsdma_chan_done(hsdma, chan);
-+}
-+
-+static void mtk_hsdma_tasklet(unsigned long arg)
-+{
-+ struct mtk_hsdam_engine *hsdma = (struct mtk_hsdam_engine *)arg;
-+
-+ mtk_hsdma_rx(hsdma);
-+ mtk_hsdma_tx(hsdma);
-+}
-+
-+static int mtk_hsdam_alloc_desc(struct mtk_hsdam_engine *hsdma,
-+ struct mtk_hsdma_chan *chan)
-+{
-+ int i;
-+
-+ chan->tx_ring = dma_alloc_coherent(hsdma->ddev.dev,
-+ 2 * HSDMA_DESCS_NUM * sizeof(*chan->tx_ring),
-+ &chan->desc_addr, GFP_ATOMIC | __GFP_ZERO);
-+ if (!chan->tx_ring)
-+ goto no_mem;
-+
-+ chan->rx_ring = &chan->tx_ring[HSDMA_DESCS_NUM];
-+
-+ /* init tx ring value */
-+ for (i = 0; i < HSDMA_DESCS_NUM; i++)
-+ chan->tx_ring[i].flags = HSDMA_DESC_LS0 | HSDMA_DESC_DONE;
-+
-+ return 0;
-+no_mem:
-+ return -ENOMEM;
-+}
-+
-+static void mtk_hsdam_free_desc(struct mtk_hsdam_engine *hsdma,
-+ struct mtk_hsdma_chan *chan)
-+{
-+ if (chan->tx_ring) {
-+ dma_free_coherent(hsdma->ddev.dev,
-+ 2 * HSDMA_DESCS_NUM * sizeof(*chan->tx_ring),
-+ chan->tx_ring, chan->desc_addr);
-+ chan->tx_ring = NULL;
-+ chan->rx_ring = NULL;
-+ }
-+}
-+
-+static int mtk_hsdma_init(struct mtk_hsdam_engine *hsdma)
-+{
-+ struct mtk_hsdma_chan *chan;
-+ int ret;
-+ u32 reg;
-+
-+ /* init desc */
-+ chan = &hsdma->chan[0];
-+ ret = mtk_hsdam_alloc_desc(hsdma, chan);
-+ if (ret)
-+ return ret;
-+
-+ /* tx */
-+ mtk_hsdma_write(hsdma, HSDMA_REG_TX_BASE, chan->desc_addr);
-+ mtk_hsdma_write(hsdma, HSDMA_REG_TX_CNT, HSDMA_DESCS_NUM);
-+ /* rx */
-+ mtk_hsdma_write(hsdma, HSDMA_REG_RX_BASE, chan->desc_addr +
-+ (sizeof(struct hsdma_desc) * HSDMA_DESCS_NUM));
-+ mtk_hsdma_write(hsdma, HSDMA_REG_RX_CNT, HSDMA_DESCS_NUM);
-+ /* reset */
-+ mtk_hsdma_reset_chan(hsdma, chan);
-+
-+ /* enable rx intr */
-+ mtk_hsdma_write(hsdma, HSDMA_REG_INT_MASK, HSDMA_INT_RX_Q0);
-+
-+ /* enable dma */
-+ mtk_hsdma_write(hsdma, HSDMA_REG_GLO_CFG, HSDMA_GLO_DEFAULT);
-+
-+ /* hardware info */
-+ reg = mtk_hsdma_read(hsdma, HSDMA_REG_INFO);
-+ dev_info(hsdma->ddev.dev, "rx: %d, tx: %d\n",
-+ (reg >> HSDMA_INFO_RX_SHIFT) & HSDMA_INFO_RX_MASK,
-+ (reg >> HSDMA_INFO_TX_SHIFT) & HSDMA_INFO_TX_MASK);
-+
-+ hsdma_dump_reg(hsdma);
-+
-+ return ret;
-+}
-+
-+static void mtk_hsdma_uninit(struct mtk_hsdam_engine *hsdma)
-+{
-+ struct mtk_hsdma_chan *chan;
-+
-+ /* disable dma */
-+ mtk_hsdma_write(hsdma, HSDMA_REG_GLO_CFG, 0);
-+
-+ /* disable intr */
-+ mtk_hsdma_write(hsdma, HSDMA_REG_INT_MASK, 0);
-+
-+ /* free desc */
-+ chan = &hsdma->chan[0];
-+ mtk_hsdam_free_desc(hsdma, chan);
-+
-+ /* tx */
-+ mtk_hsdma_write(hsdma, HSDMA_REG_TX_BASE, 0);
-+ mtk_hsdma_write(hsdma, HSDMA_REG_TX_CNT, 0);
-+ /* rx */
-+ mtk_hsdma_write(hsdma, HSDMA_REG_RX_BASE, 0);
-+ mtk_hsdma_write(hsdma, HSDMA_REG_RX_CNT, 0);
-+ /* reset */
-+ mtk_hsdma_reset_chan(hsdma, chan);
-+}
-+
-+static const struct of_device_id mtk_hsdma_of_match[] = {
-+ { .compatible = "mediatek,mt7621-hsdma" },
-+ { },
-+};
-+
-+static int mtk_hsdma_probe(struct platform_device *pdev)
-+{
-+ const struct of_device_id *match;
-+ struct mtk_hsdma_chan *chan;
-+ struct mtk_hsdam_engine *hsdma;
-+ struct dma_device *dd;
-+ struct resource *res;
-+ int ret;
-+ int irq;
-+ void __iomem *base;
-+
-+ ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
-+ if (ret)
-+ return ret;
-+
-+ match = of_match_device(mtk_hsdma_of_match, &pdev->dev);
-+ if (!match)
-+ return -EINVAL;
-+
-+ hsdma = devm_kzalloc(&pdev->dev, sizeof(*hsdma), GFP_KERNEL);
-+ if (!hsdma) {
-+ dev_err(&pdev->dev, "alloc dma device failed\n");
-+ return -EINVAL;
-+ }
-+
-+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-+ base = devm_ioremap_resource(&pdev->dev, res);
-+ if (IS_ERR(base))
-+ return PTR_ERR(base);
-+ hsdma->base = base + HSDMA_BASE_OFFSET;
-+ tasklet_init(&hsdma->task, mtk_hsdma_tasklet, (unsigned long)hsdma);
-+
-+ irq = platform_get_irq(pdev, 0);
-+ if (irq < 0) {
-+ dev_err(&pdev->dev, "failed to get irq\n");
-+ return -EINVAL;
-+ }
-+ ret = devm_request_irq(&pdev->dev, irq, mtk_hsdma_irq,
-+ 0, dev_name(&pdev->dev), hsdma);
-+ if (ret) {
-+ dev_err(&pdev->dev, "failed to request irq\n");
-+ return ret;
-+ }
-+
-+ device_reset(&pdev->dev);
-+
-+ dd = &hsdma->ddev;
-+ dma_cap_set(DMA_MEMCPY, dd->cap_mask);
-+ dd->copy_align = HSDMA_ALIGN_SIZE;
-+ dd->device_free_chan_resources = mtk_hsdma_free_chan_resources;
-+ dd->device_prep_dma_memcpy = mtk_hsdma_prep_dma_memcpy;
-+ dd->device_terminate_all = mtk_hsdma_terminate_all;
-+ dd->device_tx_status = mtk_hsdma_tx_status;
-+ dd->device_issue_pending = mtk_hsdma_issue_pending;
-+ dd->dev = &pdev->dev;
-+ dd->dev->dma_parms = &hsdma->dma_parms;
-+ dma_set_max_seg_size(dd->dev, HSDMA_MAX_PLEN);
-+ INIT_LIST_HEAD(&dd->channels);
-+
-+ chan = &hsdma->chan[0];
-+ chan->id = 0;
-+ chan->vchan.desc_free = mtk_hsdma_desc_free;
-+ vchan_init(&chan->vchan, dd);
-+
-+ /* init hardware */
-+ ret = mtk_hsdma_init(hsdma);
-+ if (ret) {
-+ dev_err(&pdev->dev, "failed to alloc ring descs\n");
-+ return ret;
-+ }
-+
-+ 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, hsdma);
-+ if (ret) {
-+ dev_err(&pdev->dev, "failed to register of dma controller\n");
-+ goto err_unregister;
-+ }
-+
-+ platform_set_drvdata(pdev, hsdma);
-+
-+ return 0;
-+
-+err_unregister:
-+ dma_async_device_unregister(dd);
-+ return ret;
-+}
-+
-+static int mtk_hsdma_remove(struct platform_device *pdev)
-+{
-+ struct mtk_hsdam_engine *hsdma = platform_get_drvdata(pdev);
-+
-+ mtk_hsdma_uninit(hsdma);
-+
-+ of_dma_controller_free(pdev->dev.of_node);
-+ dma_async_device_unregister(&hsdma->ddev);
-+
-+ return 0;
-+}
-+
-+static struct platform_driver mtk_hsdma_driver = {
-+ .probe = mtk_hsdma_probe,
-+ .remove = mtk_hsdma_remove,
-+ .driver = {
-+ .name = "hsdma-mt7621",
-+ .of_match_table = mtk_hsdma_of_match,
-+ },
-+};
-+module_platform_driver(mtk_hsdma_driver);
-+
-+MODULE_AUTHOR("Michael Lee <igvtee@gmail.com>");
-+MODULE_DESCRIPTION("MTK HSDMA driver");
-+MODULE_LICENSE("GPL v2");
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-03 17:38:55 +0000