--- /dev/null
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2015, Michael Lee <igvtee@gmail.com>
+ * MTK HSDMA 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 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 int 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++) {
+ tx_desc = &chan->tx_ring[chan->tx_idx];
+
+ 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->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(*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(struct tasklet_struct *t)
+{
+ struct mtk_hsdam_engine *hsdma = from_tasklet(hsdma, t, task);
+
+ 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;
+ 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)
+ return -EINVAL;
+
+ base = devm_platform_ioremap_resource(pdev, 0);
+ if (IS_ERR(base))
+ return PTR_ERR(base);
+ hsdma->base = base + HSDMA_BASE_OFFSET;
+ tasklet_setup(&hsdma->task, mtk_hsdma_tasklet);
+
+ irq = platform_get_irq(pdev, 0);
+ if (irq < 0)
+ 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");
+ goto err_uninit_hsdma;
+ }
+
+ 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);
+err_uninit_hsdma:
+ mtk_hsdma_uninit(hsdma);
+ 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 = KBUILD_MODNAME,
+ .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");
projects / openwrt / staging / robimarko.git / commitdiff