--- /dev/null
+#include <linux/dmaengine.h>
+#include <linux/dma-mapping.h>
+#include <linux/platform_device.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/slab.h>
+#include <linux/of_dma.h>
+#include <linux/of_irq.h>
+#include <linux/dmapool.h>
+#include <linux/interrupt.h>
+#include <linux/of_address.h>
+#include "dmaengine.h"
+
+#define DESC_TYPE 27
+#define DESC_TYPE_HOST 0x10
+#define DESC_TYPE_TEARD 0x13
+
+#define TD_DESC_IS_RX (1 << 16)
+#define TD_DESC_DMA_NUM 10
+
+#define DESC_LENGTH_BITS_NUM 21
+
+#define DESC_TYPE_USB (5 << 26)
+#define DESC_PD_COMPLETE (1 << 31)
+
+/* DMA engine */
+#define DMA_TDFDQ 4
+#define DMA_TXGCR(x) (0x800 + (x) * 0x20)
+#define DMA_RXGCR(x) (0x808 + (x) * 0x20)
+#define RXHPCRA0 4
+
+#define GCR_CHAN_ENABLE (1 << 31)
+#define GCR_TEARDOWN (1 << 30)
+#define GCR_STARV_RETRY (1 << 24)
+#define GCR_DESC_TYPE_HOST (1 << 14)
+
+/* DMA scheduler */
+#define DMA_SCHED_CTRL 0
+#define DMA_SCHED_CTRL_EN (1 << 31)
+#define DMA_SCHED_WORD(x) ((x) * 4 + 0x800)
+
+#define SCHED_ENTRY0_CHAN(x) ((x) << 0)
+#define SCHED_ENTRY0_IS_RX (1 << 7)
+
+#define SCHED_ENTRY1_CHAN(x) ((x) << 8)
+#define SCHED_ENTRY1_IS_RX (1 << 15)
+
+#define SCHED_ENTRY2_CHAN(x) ((x) << 16)
+#define SCHED_ENTRY2_IS_RX (1 << 23)
+
+#define SCHED_ENTRY3_CHAN(x) ((x) << 24)
+#define SCHED_ENTRY3_IS_RX (1 << 31)
+
+/* Queue manager */
+/* 4 KiB of memory for descriptors, 2 for each endpoint */
+#define ALLOC_DECS_NUM 128
+#define DESCS_AREAS 1
+#define TOTAL_DESCS_NUM (ALLOC_DECS_NUM * DESCS_AREAS)
+#define QMGR_SCRATCH_SIZE (TOTAL_DESCS_NUM * 4)
+
+#define QMGR_LRAM0_BASE 0x80
+#define QMGR_LRAM_SIZE 0x84
+#define QMGR_LRAM1_BASE 0x88
+#define QMGR_MEMBASE(x) (0x1000 + (x) * 0x10)
+#define QMGR_MEMCTRL(x) (0x1004 + (x) * 0x10)
+#define QMGR_MEMCTRL_IDX_SH 16
+#define QMGR_MEMCTRL_DESC_SH 8
+
+#define QMGR_NUM_PEND 5
+#define QMGR_PEND(x) (0x90 + (x) * 4)
+
+#define QMGR_PENDING_SLOT_Q(x) (x / 32)
+#define QMGR_PENDING_BIT_Q(x) (x % 32)
+
+#define QMGR_QUEUE_A(n) (0x2000 + (n) * 0x10)
+#define QMGR_QUEUE_B(n) (0x2004 + (n) * 0x10)
+#define QMGR_QUEUE_C(n) (0x2008 + (n) * 0x10)
+#define QMGR_QUEUE_D(n) (0x200c + (n) * 0x10)
+
+/* Glue layer specific */
+/* USBSS / USB AM335x */
+#define USBSS_IRQ_STATUS 0x28
+#define USBSS_IRQ_ENABLER 0x2c
+#define USBSS_IRQ_CLEARR 0x30
+
+#define USBSS_IRQ_PD_COMP (1 << 2)
+
+struct cppi41_channel {
+ struct dma_chan chan;
+ struct dma_async_tx_descriptor txd;
+ struct cppi41_dd *cdd;
+ struct cppi41_desc *desc;
+ dma_addr_t desc_phys;
+ void __iomem *gcr_reg;
+ int is_tx;
+ u32 residue;
+
+ unsigned int q_num;
+ unsigned int q_comp_num;
+ unsigned int port_num;
+
+ unsigned td_retry;
+ unsigned td_queued:1;
+ unsigned td_seen:1;
+ unsigned td_desc_seen:1;
+};
+
+struct cppi41_desc {
+ u32 pd0;
+ u32 pd1;
+ u32 pd2;
+ u32 pd3;
+ u32 pd4;
+ u32 pd5;
+ u32 pd6;
+ u32 pd7;
+} __aligned(32);
+
+struct chan_queues {
+ u16 submit;
+ u16 complete;
+};
+
+struct cppi41_dd {
+ struct dma_device ddev;
+
+ void *qmgr_scratch;
+ dma_addr_t scratch_phys;
+
+ struct cppi41_desc *cd;
+ dma_addr_t descs_phys;
+ u32 first_td_desc;
+ struct cppi41_channel *chan_busy[ALLOC_DECS_NUM];
+
+ void __iomem *usbss_mem;
+ void __iomem *ctrl_mem;
+ void __iomem *sched_mem;
+ void __iomem *qmgr_mem;
+ unsigned int irq;
+ const struct chan_queues *queues_rx;
+ const struct chan_queues *queues_tx;
+ struct chan_queues td_queue;
+};
+
+#define FIST_COMPLETION_QUEUE 93
+static struct chan_queues usb_queues_tx[] = {
+ /* USB0 ENDP 1 */
+ [ 0] = { .submit = 32, .complete = 93},
+ [ 1] = { .submit = 34, .complete = 94},
+ [ 2] = { .submit = 36, .complete = 95},
+ [ 3] = { .submit = 38, .complete = 96},
+ [ 4] = { .submit = 40, .complete = 97},
+ [ 5] = { .submit = 42, .complete = 98},
+ [ 6] = { .submit = 44, .complete = 99},
+ [ 7] = { .submit = 46, .complete = 100},
+ [ 8] = { .submit = 48, .complete = 101},
+ [ 9] = { .submit = 50, .complete = 102},
+ [10] = { .submit = 52, .complete = 103},
+ [11] = { .submit = 54, .complete = 104},
+ [12] = { .submit = 56, .complete = 105},
+ [13] = { .submit = 58, .complete = 106},
+ [14] = { .submit = 60, .complete = 107},
+
+ /* USB1 ENDP1 */
+ [15] = { .submit = 62, .complete = 125},
+ [16] = { .submit = 64, .complete = 126},
+ [17] = { .submit = 66, .complete = 127},
+ [18] = { .submit = 68, .complete = 128},
+ [19] = { .submit = 70, .complete = 129},
+ [20] = { .submit = 72, .complete = 130},
+ [21] = { .submit = 74, .complete = 131},
+ [22] = { .submit = 76, .complete = 132},
+ [23] = { .submit = 78, .complete = 133},
+ [24] = { .submit = 80, .complete = 134},
+ [25] = { .submit = 82, .complete = 135},
+ [26] = { .submit = 84, .complete = 136},
+ [27] = { .submit = 86, .complete = 137},
+ [28] = { .submit = 88, .complete = 138},
+ [29] = { .submit = 90, .complete = 139},
+};
+
+static const struct chan_queues usb_queues_rx[] = {
+ /* USB0 ENDP 1 */
+ [ 0] = { .submit = 1, .complete = 109},
+ [ 1] = { .submit = 2, .complete = 110},
+ [ 2] = { .submit = 3, .complete = 111},
+ [ 3] = { .submit = 4, .complete = 112},
+ [ 4] = { .submit = 5, .complete = 113},
+ [ 5] = { .submit = 6, .complete = 114},
+ [ 6] = { .submit = 7, .complete = 115},
+ [ 7] = { .submit = 8, .complete = 116},
+ [ 8] = { .submit = 9, .complete = 117},
+ [ 9] = { .submit = 10, .complete = 118},
+ [10] = { .submit = 11, .complete = 119},
+ [11] = { .submit = 12, .complete = 120},
+ [12] = { .submit = 13, .complete = 121},
+ [13] = { .submit = 14, .complete = 122},
+ [14] = { .submit = 15, .complete = 123},
+
+ /* USB1 ENDP 1 */
+ [15] = { .submit = 16, .complete = 141},
+ [16] = { .submit = 17, .complete = 142},
+ [17] = { .submit = 18, .complete = 143},
+ [18] = { .submit = 19, .complete = 144},
+ [19] = { .submit = 20, .complete = 145},
+ [20] = { .submit = 21, .complete = 146},
+ [21] = { .submit = 22, .complete = 147},
+ [22] = { .submit = 23, .complete = 148},
+ [23] = { .submit = 24, .complete = 149},
+ [24] = { .submit = 25, .complete = 150},
+ [25] = { .submit = 26, .complete = 151},
+ [26] = { .submit = 27, .complete = 152},
+ [27] = { .submit = 28, .complete = 153},
+ [28] = { .submit = 29, .complete = 154},
+ [29] = { .submit = 30, .complete = 155},
+};
+
+struct cppi_glue_infos {
+ irqreturn_t (*isr)(int irq, void *data);
+ const struct chan_queues *queues_rx;
+ const struct chan_queues *queues_tx;
+ struct chan_queues td_queue;
+};
+
+static struct cppi41_channel *to_cpp41_chan(struct dma_chan *c)
+{
+ return container_of(c, struct cppi41_channel, chan);
+}
+
+static struct cppi41_channel *desc_to_chan(struct cppi41_dd *cdd, u32 desc)
+{
+ struct cppi41_channel *c;
+ u32 descs_size;
+ u32 desc_num;
+
+ descs_size = sizeof(struct cppi41_desc) * ALLOC_DECS_NUM;
+
+ if (!((desc >= cdd->descs_phys) &&
+ (desc < (cdd->descs_phys + descs_size)))) {
+ return NULL;
+ }
+
+ desc_num = (desc - cdd->descs_phys) / sizeof(struct cppi41_desc);
+ BUG_ON(desc_num > ALLOC_DECS_NUM);
+ c = cdd->chan_busy[desc_num];
+ cdd->chan_busy[desc_num] = NULL;
+ return c;
+}
+
+static void cppi_writel(u32 val, void *__iomem *mem)
+{
+ __raw_writel(val, mem);
+}
+
+static u32 cppi_readl(void *__iomem *mem)
+{
+ return __raw_readl(mem);
+}
+
+static u32 pd_trans_len(u32 val)
+{
+ return val & ((1 << (DESC_LENGTH_BITS_NUM + 1)) - 1);
+}
+
+static irqreturn_t cppi41_irq(int irq, void *data)
+{
+ struct cppi41_dd *cdd = data;
+ struct cppi41_channel *c;
+ u32 status;
+ int i;
+
+ status = cppi_readl(cdd->usbss_mem + USBSS_IRQ_STATUS);
+ if (!(status & USBSS_IRQ_PD_COMP))
+ return IRQ_NONE;
+ cppi_writel(status, cdd->usbss_mem + USBSS_IRQ_STATUS);
+
+ for (i = QMGR_PENDING_SLOT_Q(FIST_COMPLETION_QUEUE); i < QMGR_NUM_PEND;
+ i++) {
+ u32 val;
+ u32 q_num;
+
+ val = cppi_readl(cdd->qmgr_mem + QMGR_PEND(i));
+ if (i == QMGR_PENDING_SLOT_Q(FIST_COMPLETION_QUEUE) && val) {
+ u32 mask;
+ /* set corresponding bit for completetion Q 93 */
+ mask = 1 << QMGR_PENDING_BIT_Q(FIST_COMPLETION_QUEUE);
+ /* not set all bits for queues less than Q 93 */
+ mask--;
+ /* now invert and keep only Q 93+ set */
+ val &= ~mask;
+ }
+
+ if (val)
+ __iormb();
+
+ while (val) {
+ u32 desc;
+
+ q_num = __fls(val);
+ val &= ~(1 << q_num);
+ q_num += 32 * i;
+ desc = cppi_readl(cdd->qmgr_mem + QMGR_QUEUE_D(q_num));
+ desc &= ~0x1f;
+ c = desc_to_chan(cdd, desc);
+ if (WARN_ON(!c)) {
+ pr_err("%s() q %d desc %08x\n", __func__,
+ q_num, desc);
+ continue;
+ }
+ c->residue = pd_trans_len(c->desc->pd6) -
+ pd_trans_len(c->desc->pd0);
+
+ dma_cookie_complete(&c->txd);
+ c->txd.callback(c->txd.callback_param);
+ }
+ }
+ return IRQ_HANDLED;
+}
+
+static dma_cookie_t cppi41_tx_submit(struct dma_async_tx_descriptor *tx)
+{
+ dma_cookie_t cookie;
+
+ cookie = dma_cookie_assign(tx);
+
+ return cookie;
+}
+
+static int cppi41_dma_alloc_chan_resources(struct dma_chan *chan)
+{
+ struct cppi41_channel *c = to_cpp41_chan(chan);
+
+ dma_cookie_init(chan);
+ dma_async_tx_descriptor_init(&c->txd, chan);
+ c->txd.tx_submit = cppi41_tx_submit;
+
+ if (!c->is_tx)
+ cppi_writel(c->q_num, c->gcr_reg + RXHPCRA0);
+
+ return 0;
+}
+
+static void cppi41_dma_free_chan_resources(struct dma_chan *chan)
+{
+}
+
+static enum dma_status cppi41_dma_tx_status(struct dma_chan *chan,
+ dma_cookie_t cookie, struct dma_tx_state *txstate)
+{
+ struct cppi41_channel *c = to_cpp41_chan(chan);
+ enum dma_status ret;
+
+ /* lock */
+ ret = dma_cookie_status(chan, cookie, txstate);
+ if (txstate && ret == DMA_SUCCESS)
+ txstate->residue = c->residue;
+ /* unlock */
+
+ return ret;
+}
+
+static void push_desc_queue(struct cppi41_channel *c)
+{
+ struct cppi41_dd *cdd = c->cdd;
+ u32 desc_num;
+ u32 desc_phys;
+ u32 reg;
+
+ desc_phys = lower_32_bits(c->desc_phys);
+ desc_num = (desc_phys - cdd->descs_phys) / sizeof(struct cppi41_desc);
+ WARN_ON(cdd->chan_busy[desc_num]);
+ cdd->chan_busy[desc_num] = c;
+
+ reg = (sizeof(struct cppi41_desc) - 24) / 4;
+ reg |= desc_phys;
+ cppi_writel(reg, cdd->qmgr_mem + QMGR_QUEUE_D(c->q_num));
+}
+
+static void cppi41_dma_issue_pending(struct dma_chan *chan)
+{
+ struct cppi41_channel *c = to_cpp41_chan(chan);
+ u32 reg;
+
+ c->residue = 0;
+
+ reg = GCR_CHAN_ENABLE;
+ if (!c->is_tx) {
+ reg |= GCR_STARV_RETRY;
+ reg |= GCR_DESC_TYPE_HOST;
+ reg |= c->q_comp_num;
+ }
+
+ cppi_writel(reg, c->gcr_reg);
+
+ /*
+ * We don't use writel() but __raw_writel() so we have to make sure
+ * that the DMA descriptor in coherent memory made to the main memory
+ * before starting the dma engine.
+ */
+ __iowmb();
+ push_desc_queue(c);
+}
+
+static u32 get_host_pd0(u32 length)
+{
+ u32 reg;
+
+ reg = DESC_TYPE_HOST << DESC_TYPE;
+ reg |= length;
+
+ return reg;
+}
+
+static u32 get_host_pd1(struct cppi41_channel *c)
+{
+ u32 reg;
+
+ reg = 0;
+
+ return reg;
+}
+
+static u32 get_host_pd2(struct cppi41_channel *c)
+{
+ u32 reg;
+
+ reg = DESC_TYPE_USB;
+ reg |= c->q_comp_num;
+
+ return reg;
+}
+
+static u32 get_host_pd3(u32 length)
+{
+ u32 reg;
+
+ /* PD3 = packet size */
+ reg = length;
+
+ return reg;
+}
+
+static u32 get_host_pd6(u32 length)
+{
+ u32 reg;
+
+ /* PD6 buffer size */
+ reg = DESC_PD_COMPLETE;
+ reg |= length;
+
+ return reg;
+}
+
+static u32 get_host_pd4_or_7(u32 addr)
+{
+ u32 reg;
+
+ reg = addr;
+
+ return reg;
+}
+
+static u32 get_host_pd5(void)
+{
+ u32 reg;
+
+ reg = 0;
+
+ return reg;
+}
+
+static struct dma_async_tx_descriptor *cppi41_dma_prep_slave_sg(
+ struct dma_chan *chan, struct scatterlist *sgl, unsigned sg_len,
+ enum dma_transfer_direction dir, unsigned long tx_flags, void *context)
+{
+ struct cppi41_channel *c = to_cpp41_chan(chan);
+ struct cppi41_desc *d;
+ struct scatterlist *sg;
+ unsigned int i;
+ unsigned int num;
+
+ num = 0;
+ d = c->desc;
+ for_each_sg(sgl, sg, sg_len, i) {
+ u32 addr;
+ u32 len;
+
+ /* We need to use more than one desc once musb supports sg */
+ BUG_ON(num > 0);
+ addr = lower_32_bits(sg_dma_address(sg));
+ len = sg_dma_len(sg);
+
+ d->pd0 = get_host_pd0(len);
+ d->pd1 = get_host_pd1(c);
+ d->pd2 = get_host_pd2(c);
+ d->pd3 = get_host_pd3(len);
+ d->pd4 = get_host_pd4_or_7(addr);
+ d->pd5 = get_host_pd5();
+ d->pd6 = get_host_pd6(len);
+ d->pd7 = get_host_pd4_or_7(addr);
+
+ d++;
+ }
+
+ return &c->txd;
+}
+
+static int cpp41_cfg_chan(struct cppi41_channel *c,
+ struct dma_slave_config *cfg)
+{
+ return 0;
+}
+
+static void cppi41_compute_td_desc(struct cppi41_desc *d)
+{
+ d->pd0 = DESC_TYPE_TEARD << DESC_TYPE;
+}
+
+static u32 cppi41_pop_desc(struct cppi41_dd *cdd, unsigned queue_num)
+{
+ u32 desc;
+
+ desc = cppi_readl(cdd->qmgr_mem + QMGR_QUEUE_D(queue_num));
+ desc &= ~0x1f;
+ return desc;
+}
+
+static int cppi41_tear_down_chan(struct cppi41_channel *c)
+{
+ struct cppi41_dd *cdd = c->cdd;
+ struct cppi41_desc *td;
+ u32 reg;
+ u32 desc_phys;
+ u32 td_desc_phys;
+
+ td = cdd->cd;
+ td += cdd->first_td_desc;
+
+ td_desc_phys = cdd->descs_phys;
+ td_desc_phys += cdd->first_td_desc * sizeof(struct cppi41_desc);
+
+ if (!c->td_queued) {
+ cppi41_compute_td_desc(td);
+ __iowmb();
+
+ reg = (sizeof(struct cppi41_desc) - 24) / 4;
+ reg |= td_desc_phys;
+ cppi_writel(reg, cdd->qmgr_mem +
+ QMGR_QUEUE_D(cdd->td_queue.submit));
+
+ reg = GCR_CHAN_ENABLE;
+ if (!c->is_tx) {
+ reg |= GCR_STARV_RETRY;
+ reg |= GCR_DESC_TYPE_HOST;
+ reg |= c->q_comp_num;
+ }
+ reg |= GCR_TEARDOWN;
+ cppi_writel(reg, c->gcr_reg);
+ c->td_queued = 1;
+ c->td_retry = 100;
+ }
+
+ if (!c->td_seen) {
+ unsigned td_comp_queue;
+
+ if (c->is_tx)
+ td_comp_queue = cdd->td_queue.complete;
+ else
+ td_comp_queue = c->q_comp_num;
+
+ desc_phys = cppi41_pop_desc(cdd, td_comp_queue);
+ if (desc_phys) {
+ __iormb();
+
+ if (desc_phys == td_desc_phys) {
+ u32 pd0;
+ pd0 = td->pd0;
+ WARN_ON((pd0 >> DESC_TYPE) != DESC_TYPE_TEARD);
+ WARN_ON(!c->is_tx && !(pd0 & TD_DESC_IS_RX));
+ WARN_ON((pd0 & 0x1f) != c->port_num);
+ } else {
+ __WARN();
+ }
+ c->td_seen = 1;
+ }
+ }
+ if (!c->td_desc_seen) {
+ desc_phys = cppi41_pop_desc(cdd, c->q_comp_num);
+ if (desc_phys) {
+ __iormb();
+ WARN_ON(c->desc_phys != desc_phys);
+ c->td_desc_seen = 1;
+ }
+ }
+ c->td_retry--;
+ /*
+ * If the TX descriptor / channel is in use, the caller needs to poke
+ * his TD bit multiple times. After that he hardware releases the
+ * transfer descriptor followed by TD descriptor. Waiting seems not to
+ * cause any difference.
+ * RX seems to be thrown out right away. However once the TearDown
+ * descriptor gets through we are done. If we have seens the transfer
+ * descriptor before the TD we fetch it from enqueue, it has to be
+ * there waiting for us.
+ */
+ if (!c->td_seen && c->td_retry)
+ return -EAGAIN;
+
+ WARN_ON(!c->td_retry);
+ if (!c->td_desc_seen) {
+ desc_phys = cppi_readl(cdd->qmgr_mem + QMGR_QUEUE_D(c->q_num));
+ WARN_ON(!desc_phys);
+ }
+
+ c->td_queued = 0;
+ c->td_seen = 0;
+ c->td_desc_seen = 0;
+ cppi_writel(0, c->gcr_reg);
+ return 0;
+}
+
+static int cppi41_stop_chan(struct dma_chan *chan)
+{
+ struct cppi41_channel *c = to_cpp41_chan(chan);
+ struct cppi41_dd *cdd = c->cdd;
+ u32 desc_num;
+ u32 desc_phys;
+ int ret;
+
+ ret = cppi41_tear_down_chan(c);
+ if (ret)
+ return ret;
+
+ desc_phys = lower_32_bits(c->desc_phys);
+ desc_num = (desc_phys - cdd->descs_phys) / sizeof(struct cppi41_desc);
+ WARN_ON(!cdd->chan_busy[desc_num]);
+ cdd->chan_busy[desc_num] = NULL;
+
+ return 0;
+}
+
+static int cppi41_dma_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd,
+ unsigned long arg)
+{
+ struct cppi41_channel *c = to_cpp41_chan(chan);
+ int ret;
+
+ switch (cmd) {
+ case DMA_SLAVE_CONFIG:
+ ret = cpp41_cfg_chan(c, (struct dma_slave_config *) arg);
+ break;
+
+ case DMA_TERMINATE_ALL:
+ ret = cppi41_stop_chan(chan);
+ break;
+
+ default:
+ ret = -ENXIO;
+ break;
+ }
+ return ret;
+}
+
+static void cleanup_chans(struct cppi41_dd *cdd)
+{
+ while (!list_empty(&cdd->ddev.channels)) {
+ struct cppi41_channel *cchan;
+
+ cchan = list_first_entry(&cdd->ddev.channels,
+ struct cppi41_channel, chan.device_node);
+ list_del(&cchan->chan.device_node);
+ kfree(cchan);
+ }
+}
+
+static int cppi41_add_chans(struct platform_device *pdev, struct cppi41_dd *cdd)
+{
+ struct cppi41_channel *cchan;
+ int i;
+ int ret;
+ u32 n_chans;
+
+ ret = of_property_read_u32(pdev->dev.of_node, "#dma-channels",
+ &n_chans);
+ if (ret)
+ return ret;
+ /*
+ * The channels can only be used as TX or as RX. So we add twice
+ * that much dma channels because USB can only do RX or TX.
+ */
+ n_chans *= 2;
+
+ for (i = 0; i < n_chans; i++) {
+ cchan = kzalloc(sizeof(*cchan), GFP_KERNEL);
+ if (!cchan)
+ goto err;
+
+ cchan->cdd = cdd;
+ if (i & 1) {
+ cchan->gcr_reg = cdd->ctrl_mem + DMA_TXGCR(i >> 1);
+ cchan->is_tx = 1;
+ } else {
+ cchan->gcr_reg = cdd->ctrl_mem + DMA_RXGCR(i >> 1);
+ cchan->is_tx = 0;
+ }
+ cchan->port_num = i >> 1;
+ cchan->desc = &cdd->cd[i];
+ cchan->desc_phys = cdd->descs_phys;
+ cchan->desc_phys += i * sizeof(struct cppi41_desc);
+ cchan->chan.device = &cdd->ddev;
+ list_add_tail(&cchan->chan.device_node, &cdd->ddev.channels);
+ }
+ cdd->first_td_desc = n_chans;
+
+ return 0;
+err:
+ cleanup_chans(cdd);
+ return -ENOMEM;
+}
+
+static void purge_descs(struct platform_device *pdev, struct cppi41_dd *cdd)
+{
+ unsigned int mem_decs;
+ int i;
+
+ mem_decs = ALLOC_DECS_NUM * sizeof(struct cppi41_desc);
+
+ for (i = 0; i < DESCS_AREAS; i++) {
+
+ cppi_writel(0, cdd->qmgr_mem + QMGR_MEMBASE(i));
+ cppi_writel(0, cdd->qmgr_mem + QMGR_MEMCTRL(i));
+
+ dma_free_coherent(&pdev->dev, mem_decs, cdd->cd,
+ cdd->descs_phys);
+ }
+}
+
+static void disable_sched(struct cppi41_dd *cdd)
+{
+ cppi_writel(0, cdd->sched_mem + DMA_SCHED_CTRL);
+}
+
+static void deinit_cpii41(struct platform_device *pdev, struct cppi41_dd *cdd)
+{
+ disable_sched(cdd);
+
+ purge_descs(pdev, cdd);
+
+ cppi_writel(0, cdd->qmgr_mem + QMGR_LRAM0_BASE);
+ cppi_writel(0, cdd->qmgr_mem + QMGR_LRAM0_BASE);
+ dma_free_coherent(&pdev->dev, QMGR_SCRATCH_SIZE, cdd->qmgr_scratch,
+ cdd->scratch_phys);
+}
+
+static int init_descs(struct platform_device *pdev, struct cppi41_dd *cdd)
+{
+ unsigned int desc_size;
+ unsigned int mem_decs;
+ int i;
+ u32 reg;
+ u32 idx;
+
+ BUILD_BUG_ON(sizeof(struct cppi41_desc) &
+ (sizeof(struct cppi41_desc) - 1));
+ BUILD_BUG_ON(sizeof(struct cppi41_desc) < 32);
+ BUILD_BUG_ON(ALLOC_DECS_NUM < 32);
+
+ desc_size = sizeof(struct cppi41_desc);
+ mem_decs = ALLOC_DECS_NUM * desc_size;
+
+ idx = 0;
+ for (i = 0; i < DESCS_AREAS; i++) {
+
+ reg = idx << QMGR_MEMCTRL_IDX_SH;
+ reg |= (ilog2(desc_size) - 5) << QMGR_MEMCTRL_DESC_SH;
+ reg |= ilog2(ALLOC_DECS_NUM) - 5;
+
+ BUILD_BUG_ON(DESCS_AREAS != 1);
+ cdd->cd = dma_alloc_coherent(&pdev->dev, mem_decs,
+ &cdd->descs_phys, GFP_KERNEL);
+ if (!cdd->cd)
+ return -ENOMEM;
+
+ cppi_writel(cdd->descs_phys, cdd->qmgr_mem + QMGR_MEMBASE(i));
+ cppi_writel(reg, cdd->qmgr_mem + QMGR_MEMCTRL(i));
+
+ idx += ALLOC_DECS_NUM;
+ }
+ return 0;
+}
+
+static void init_sched(struct cppi41_dd *cdd)
+{
+ unsigned ch;
+ unsigned word;
+ u32 reg;
+
+ word = 0;
+ cppi_writel(0, cdd->sched_mem + DMA_SCHED_CTRL);
+ for (ch = 0; ch < 15 * 2; ch += 2) {
+
+ reg = SCHED_ENTRY0_CHAN(ch);
+ reg |= SCHED_ENTRY1_CHAN(ch) | SCHED_ENTRY1_IS_RX;
+
+ reg |= SCHED_ENTRY2_CHAN(ch + 1);
+ reg |= SCHED_ENTRY3_CHAN(ch + 1) | SCHED_ENTRY3_IS_RX;
+ cppi_writel(reg, cdd->sched_mem + DMA_SCHED_WORD(word));
+ word++;
+ }
+ reg = 15 * 2 * 2 - 1;
+ reg |= DMA_SCHED_CTRL_EN;
+ cppi_writel(reg, cdd->sched_mem + DMA_SCHED_CTRL);
+}
+
+static int init_cppi41(struct platform_device *pdev, struct cppi41_dd *cdd)
+{
+ int ret;
+
+ BUILD_BUG_ON(QMGR_SCRATCH_SIZE > ((1 << 14) - 1));
+ cdd->qmgr_scratch = dma_alloc_coherent(&pdev->dev, QMGR_SCRATCH_SIZE,
+ &cdd->scratch_phys, GFP_KERNEL);
+ if (!cdd->qmgr_scratch)
+ return -ENOMEM;
+
+ cppi_writel(cdd->scratch_phys, cdd->qmgr_mem + QMGR_LRAM0_BASE);
+ cppi_writel(QMGR_SCRATCH_SIZE, cdd->qmgr_mem + QMGR_LRAM_SIZE);
+ cppi_writel(0, cdd->qmgr_mem + QMGR_LRAM1_BASE);
+
+ ret = init_descs(pdev, cdd);
+ if (ret)
+ goto err_td;
+
+ cppi_writel(cdd->td_queue.submit, cdd->ctrl_mem + DMA_TDFDQ);
+ init_sched(cdd);
+ return 0;
+err_td:
+ deinit_cpii41(pdev, cdd);
+ return ret;
+}
+
+static struct platform_driver cpp41_dma_driver;
+/*
+ * The param format is:
+ * X Y
+ * X: Port
+ * Y: 0 = RX else TX
+ */
+#define INFO_PORT 0
+#define INFO_IS_TX 1
+
+static bool cpp41_dma_filter_fn(struct dma_chan *chan, void *param)
+{
+ struct cppi41_channel *cchan;
+ struct cppi41_dd *cdd;
+ const struct chan_queues *queues;
+ u32 *num = param;
+
+ if (chan->device->dev->driver != &cpp41_dma_driver.driver)
+ return false;
+
+ cchan = to_cpp41_chan(chan);
+
+ if (cchan->port_num != num[INFO_PORT])
+ return false;
+
+ if (cchan->is_tx && !num[INFO_IS_TX])
+ return false;
+ cdd = cchan->cdd;
+ if (cchan->is_tx)
+ queues = cdd->queues_tx;
+ else
+ queues = cdd->queues_rx;
+
+ BUILD_BUG_ON(ARRAY_SIZE(usb_queues_rx) != ARRAY_SIZE(usb_queues_tx));
+ if (WARN_ON(cchan->port_num > ARRAY_SIZE(usb_queues_rx)))
+ return false;
+
+ cchan->q_num = queues[cchan->port_num].submit;
+ cchan->q_comp_num = queues[cchan->port_num].complete;
+ return true;
+}
+
+static struct of_dma_filter_info cpp41_dma_info = {
+ .filter_fn = cpp41_dma_filter_fn,
+};
+
+static struct dma_chan *cppi41_dma_xlate(struct of_phandle_args *dma_spec,
+ struct of_dma *ofdma)
+{
+ int count = dma_spec->args_count;
+ struct of_dma_filter_info *info = ofdma->of_dma_data;
+
+ if (!info || !info->filter_fn)
+ return NULL;
+
+ if (count != 2)
+ return NULL;
+
+ return dma_request_channel(info->dma_cap, info->filter_fn,
+ &dma_spec->args[0]);
+}
+
+static const struct cppi_glue_infos usb_infos = {
+ .isr = cppi41_irq,
+ .queues_rx = usb_queues_rx,
+ .queues_tx = usb_queues_tx,
+ .td_queue = { .submit = 31, .complete = 0 },
+};
+
+static const struct of_device_id cppi41_dma_ids[] = {
+ { .compatible = "ti,am3359-cppi41", .data = &usb_infos},
+ {},
+};
+MODULE_DEVICE_TABLE(of, cppi41_dma_ids);
+
+static const struct cppi_glue_infos *get_glue_info(struct platform_device *pdev)
+{
+ const struct of_device_id *of_id;
+
+ of_id = of_match_node(cppi41_dma_ids, pdev->dev.of_node);
+ if (!of_id)
+ return NULL;
+ return of_id->data;
+}
+
+static int cppi41_dma_probe(struct platform_device *pdev)
+{
+ struct cppi41_dd *cdd;
+ const struct cppi_glue_infos *glue_info;
+ int irq;
+ int ret;
+
+ glue_info = get_glue_info(pdev);
+ if (!glue_info)
+ return -EINVAL;
+
+ cdd = kzalloc(sizeof(*cdd), GFP_KERNEL);
+ if (!cdd)
+ return -ENOMEM;
+
+ dma_cap_set(DMA_SLAVE, cdd->ddev.cap_mask);
+ cdd->ddev.device_alloc_chan_resources = cppi41_dma_alloc_chan_resources;
+ cdd->ddev.device_free_chan_resources = cppi41_dma_free_chan_resources;
+ cdd->ddev.device_tx_status = cppi41_dma_tx_status;
+ cdd->ddev.device_issue_pending = cppi41_dma_issue_pending;
+ cdd->ddev.device_prep_slave_sg = cppi41_dma_prep_slave_sg;
+ cdd->ddev.device_control = cppi41_dma_control;
+ cdd->ddev.dev = &pdev->dev;
+ INIT_LIST_HEAD(&cdd->ddev.channels);
+ cpp41_dma_info.dma_cap = cdd->ddev.cap_mask;
+
+ cdd->usbss_mem = of_iomap(pdev->dev.of_node, 0);
+ cdd->ctrl_mem = of_iomap(pdev->dev.of_node, 1);
+ cdd->sched_mem = of_iomap(pdev->dev.of_node, 2);
+ cdd->qmgr_mem = of_iomap(pdev->dev.of_node, 3);
+
+ if (!cdd->usbss_mem || !cdd->ctrl_mem || !cdd->sched_mem ||
+ !cdd->qmgr_mem) {
+ ret = -ENXIO;
+ goto err_remap;
+ }
+
+ cdd->queues_rx = glue_info->queues_rx;
+ cdd->queues_tx = glue_info->queues_tx;
+ cdd->td_queue = glue_info->td_queue;
+
+ ret = init_cppi41(pdev, cdd);
+ if (ret)
+ goto err_init_cppi;
+
+ ret = cppi41_add_chans(pdev, cdd);
+ if (ret)
+ goto err_chans;
+
+ irq = irq_of_parse_and_map(pdev->dev.of_node, 0);
+ if (!irq)
+ goto err_irq;
+
+ cppi_writel(USBSS_IRQ_PD_COMP, cdd->usbss_mem + USBSS_IRQ_ENABLER);
+
+ ret = request_irq(irq, glue_info->isr, IRQF_SHARED,
+ dev_name(&pdev->dev), cdd);
+ if (ret)
+ goto err_irq;
+ cdd->irq = irq;
+
+ ret = dma_async_device_register(&cdd->ddev);
+ if (ret)
+ goto err_dma_reg;
+
+ ret = of_dma_controller_register(pdev->dev.of_node,
+ cppi41_dma_xlate, &cpp41_dma_info);
+ if (ret)
+ goto err_of;
+
+ platform_set_drvdata(pdev, cdd);
+ return 0;
+err_of:
+ dma_async_device_unregister(&cdd->ddev);
+err_dma_reg:
+ free_irq(irq, cdd);
+err_irq:
+ cppi_writel(0, cdd->usbss_mem + USBSS_IRQ_CLEARR);
+ cleanup_chans(cdd);
+err_chans:
+ deinit_cpii41(pdev, cdd);
+err_init_cppi:
+ iounmap(cdd->usbss_mem);
+ iounmap(cdd->ctrl_mem);
+ iounmap(cdd->sched_mem);
+ iounmap(cdd->qmgr_mem);
+err_remap:
+ kfree(cdd);
+ return ret;
+}
+
+static int cppi41_dma_remove(struct platform_device *pdev)
+{
+ struct cppi41_dd *cdd = platform_get_drvdata(pdev);
+
+ of_dma_controller_free(pdev->dev.of_node);
+ dma_async_device_unregister(&cdd->ddev);
+
+ cppi_writel(0, cdd->usbss_mem + USBSS_IRQ_CLEARR);
+ free_irq(cdd->irq, cdd);
+ cleanup_chans(cdd);
+ deinit_cpii41(pdev, cdd);
+ iounmap(cdd->usbss_mem);
+ iounmap(cdd->ctrl_mem);
+ iounmap(cdd->sched_mem);
+ iounmap(cdd->qmgr_mem);
+ kfree(cdd);
+ return 0;
+}
+
+static struct platform_driver cpp41_dma_driver = {
+ .probe = cppi41_dma_probe,
+ .remove = cppi41_dma_remove,
+ .driver = {
+ .name = "cppi41-dma-engine",
+ .owner = THIS_MODULE,
+ .of_match_table = of_match_ptr(cppi41_dma_ids),
+ },
+};
+
+module_platform_driver(cpp41_dma_driver);
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Sebastian Andrzej Siewior <bigeasy@linutronix.de>");
--- /dev/null
+#include <linux/device.h>
+#include <linux/dma-mapping.h>
+#include <linux/dmaengine.h>
+#include <linux/sizes.h>
+#include <linux/platform_device.h>
+#include <linux/of.h>
+
+#include "musb_core.h"
+
+#define RNDIS_REG(x) (0x80 + ((x - 1) * 4))
+
+#define EP_MODE_AUTOREG_NONE 0
+#define EP_MODE_AUTOREG_ALL_NEOP 1
+#define EP_MODE_AUTOREG_ALWAYS 3
+
+#define EP_MODE_DMA_TRANSPARENT 0
+#define EP_MODE_DMA_RNDIS 1
+#define EP_MODE_DMA_GEN_RNDIS 3
+
+#define USB_CTRL_TX_MODE 0x70
+#define USB_CTRL_RX_MODE 0x74
+#define USB_CTRL_AUTOREQ 0xd0
+#define USB_TDOWN 0xd8
+
+struct cppi41_dma_channel {
+ struct dma_channel channel;
+ struct cppi41_dma_controller *controller;
+ struct musb_hw_ep *hw_ep;
+ struct dma_chan *dc;
+ dma_cookie_t cookie;
+ u8 port_num;
+ u8 is_tx;
+ u8 is_allocated;
+ u8 usb_toggle;
+
+ dma_addr_t buf_addr;
+ u32 total_len;
+ u32 prog_len;
+ u32 transferred;
+ u32 packet_sz;
+};
+
+#define MUSB_DMA_NUM_CHANNELS 15
+
+struct cppi41_dma_controller {
+ struct dma_controller controller;
+ struct cppi41_dma_channel rx_channel[MUSB_DMA_NUM_CHANNELS];
+ struct cppi41_dma_channel tx_channel[MUSB_DMA_NUM_CHANNELS];
+ struct musb *musb;
+ u32 rx_mode;
+ u32 tx_mode;
+ u32 auto_req;
+};
+
+static void save_rx_toggle(struct cppi41_dma_channel *cppi41_channel)
+{
+ u16 csr;
+ u8 toggle;
+
+ if (cppi41_channel->is_tx)
+ return;
+ if (!is_host_active(cppi41_channel->controller->musb))
+ return;
+
+ csr = musb_readw(cppi41_channel->hw_ep->regs, MUSB_RXCSR);
+ toggle = csr & MUSB_RXCSR_H_DATATOGGLE ? 1 : 0;
+
+ cppi41_channel->usb_toggle = toggle;
+}
+
+static void update_rx_toggle(struct cppi41_dma_channel *cppi41_channel)
+{
+ u16 csr;
+ u8 toggle;
+
+ if (cppi41_channel->is_tx)
+ return;
+ if (!is_host_active(cppi41_channel->controller->musb))
+ return;
+
+ csr = musb_readw(cppi41_channel->hw_ep->regs, MUSB_RXCSR);
+ toggle = csr & MUSB_RXCSR_H_DATATOGGLE ? 1 : 0;
+
+ /*
+ * AM335x Advisory 1.0.13: Due to internal synchronisation error the
+ * data toggle may reset from DATA1 to DATA0 during receiving data from
+ * more than one endpoint.
+ */
+ if (!toggle && toggle == cppi41_channel->usb_toggle) {
+ csr |= MUSB_RXCSR_H_DATATOGGLE | MUSB_RXCSR_H_WR_DATATOGGLE;
+ musb_writew(cppi41_channel->hw_ep->regs, MUSB_RXCSR, csr);
+ dev_dbg(cppi41_channel->controller->musb->controller,
+ "Restoring DATA1 toggle.\n");
+ }
+
+ cppi41_channel->usb_toggle = toggle;
+}
+
+static void cppi41_dma_callback(void *private_data)
+{
+ struct dma_channel *channel = private_data;
+ struct cppi41_dma_channel *cppi41_channel = channel->private_data;
+ struct musb_hw_ep *hw_ep = cppi41_channel->hw_ep;
+ struct musb *musb = hw_ep->musb;
+ unsigned long flags;
+ struct dma_tx_state txstate;
+ u32 transferred;
+
+ spin_lock_irqsave(&musb->lock, flags);
+
+ dmaengine_tx_status(cppi41_channel->dc, cppi41_channel->cookie,
+ &txstate);
+ transferred = cppi41_channel->prog_len - txstate.residue;
+ cppi41_channel->transferred += transferred;
+
+ dev_dbg(musb->controller, "DMA transfer done on hw_ep=%d bytes=%d/%d\n",
+ hw_ep->epnum, cppi41_channel->transferred,
+ cppi41_channel->total_len);
+
+ update_rx_toggle(cppi41_channel);
+
+ if (cppi41_channel->transferred == cppi41_channel->total_len ||
+ transferred < cppi41_channel->packet_sz) {
+
+ /* done, complete */
+ cppi41_channel->channel.actual_len =
+ cppi41_channel->transferred;
+ cppi41_channel->channel.status = MUSB_DMA_STATUS_FREE;
+ musb_dma_completion(musb, hw_ep->epnum, cppi41_channel->is_tx);
+ } else {
+ /* next iteration, reload */
+ struct dma_chan *dc = cppi41_channel->dc;
+ struct dma_async_tx_descriptor *dma_desc;
+ enum dma_transfer_direction direction;
+ u16 csr;
+ u32 remain_bytes;
+ void __iomem *epio = cppi41_channel->hw_ep->regs;
+
+ cppi41_channel->buf_addr += cppi41_channel->packet_sz;
+
+ remain_bytes = cppi41_channel->total_len;
+ remain_bytes -= cppi41_channel->transferred;
+ remain_bytes = min(remain_bytes, cppi41_channel->packet_sz);
+ cppi41_channel->prog_len = remain_bytes;
+
+ direction = cppi41_channel->is_tx ? DMA_MEM_TO_DEV
+ : DMA_DEV_TO_MEM;
+ dma_desc = dmaengine_prep_slave_single(dc,
+ cppi41_channel->buf_addr,
+ remain_bytes,
+ direction,
+ DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
+ if (WARN_ON(!dma_desc))
+ return;
+
+ dma_desc->callback = cppi41_dma_callback;
+ dma_desc->callback_param = channel;
+ cppi41_channel->cookie = dma_desc->tx_submit(dma_desc);
+ dma_async_issue_pending(dc);
+
+ if (!cppi41_channel->is_tx) {
+ csr = musb_readw(epio, MUSB_RXCSR);
+ csr |= MUSB_RXCSR_H_REQPKT;
+ musb_writew(epio, MUSB_RXCSR, csr);
+ }
+ }
+ spin_unlock_irqrestore(&musb->lock, flags);
+}
+
+static u32 update_ep_mode(unsigned ep, unsigned mode, u32 old)
+{
+ unsigned shift;
+
+ shift = (ep - 1) * 2;
+ old &= ~(3 << shift);
+ old |= mode << shift;
+ return old;
+}
+
+static void cppi41_set_dma_mode(struct cppi41_dma_channel *cppi41_channel,
+ unsigned mode)
+{
+ struct cppi41_dma_controller *controller = cppi41_channel->controller;
+ u32 port;
+ u32 new_mode;
+ u32 old_mode;
+
+ if (cppi41_channel->is_tx)
+ old_mode = controller->tx_mode;
+ else
+ old_mode = controller->rx_mode;
+ port = cppi41_channel->port_num;
+ new_mode = update_ep_mode(port, mode, old_mode);
+
+ if (new_mode == old_mode)
+ return;
+ if (cppi41_channel->is_tx) {
+ controller->tx_mode = new_mode;
+ musb_writel(controller->musb->ctrl_base, USB_CTRL_TX_MODE,
+ new_mode);
+ } else {
+ controller->rx_mode = new_mode;
+ musb_writel(controller->musb->ctrl_base, USB_CTRL_RX_MODE,
+ new_mode);
+ }
+}
+
+static void cppi41_set_autoreq_mode(struct cppi41_dma_channel *cppi41_channel,
+ unsigned mode)
+{
+ struct cppi41_dma_controller *controller = cppi41_channel->controller;
+ u32 port;
+ u32 new_mode;
+ u32 old_mode;
+
+ old_mode = controller->auto_req;
+ port = cppi41_channel->port_num;
+ new_mode = update_ep_mode(port, mode, old_mode);
+
+ if (new_mode == old_mode)
+ return;
+ controller->auto_req = new_mode;
+ musb_writel(controller->musb->ctrl_base, USB_CTRL_AUTOREQ, new_mode);
+}
+
+static bool cppi41_configure_channel(struct dma_channel *channel,
+ u16 packet_sz, u8 mode,
+ dma_addr_t dma_addr, u32 len)
+{
+ struct cppi41_dma_channel *cppi41_channel = channel->private_data;
+ struct dma_chan *dc = cppi41_channel->dc;
+ struct dma_async_tx_descriptor *dma_desc;
+ enum dma_transfer_direction direction;
+ struct musb *musb = cppi41_channel->controller->musb;
+ unsigned use_gen_rndis = 0;
+
+ dev_dbg(musb->controller,
+ "configure ep%d/%x packet_sz=%d, mode=%d, dma_addr=0x%llx, len=%d is_tx=%d\n",
+ cppi41_channel->port_num, RNDIS_REG(cppi41_channel->port_num),
+ packet_sz, mode, (unsigned long long) dma_addr,
+ len, cppi41_channel->is_tx);
+
+ cppi41_channel->buf_addr = dma_addr;
+ cppi41_channel->total_len = len;
+ cppi41_channel->transferred = 0;
+ cppi41_channel->packet_sz = packet_sz;
+
+ /*
+ * Due to AM335x' Advisory 1.0.13 we are not allowed to transfer more
+ * than max packet size at a time.
+ */
+ if (cppi41_channel->is_tx)
+ use_gen_rndis = 1;
+
+ if (use_gen_rndis) {
+ /* RNDIS mode */
+ if (len > packet_sz) {
+ musb_writel(musb->ctrl_base,
+ RNDIS_REG(cppi41_channel->port_num), len);
+ /* gen rndis */
+ cppi41_set_dma_mode(cppi41_channel,
+ EP_MODE_DMA_GEN_RNDIS);
+
+ /* auto req */
+ cppi41_set_autoreq_mode(cppi41_channel,
+ EP_MODE_AUTOREG_ALL_NEOP);
+ } else {
+ musb_writel(musb->ctrl_base,
+ RNDIS_REG(cppi41_channel->port_num), 0);
+ cppi41_set_dma_mode(cppi41_channel,
+ EP_MODE_DMA_TRANSPARENT);
+ cppi41_set_autoreq_mode(cppi41_channel,
+ EP_MODE_AUTOREG_NONE);
+ }
+ } else {
+ /* fallback mode */
+ cppi41_set_dma_mode(cppi41_channel, EP_MODE_DMA_TRANSPARENT);
+ cppi41_set_autoreq_mode(cppi41_channel, EP_MODE_AUTOREG_NONE);
+ len = min_t(u32, packet_sz, len);
+ }
+ cppi41_channel->prog_len = len;
+ direction = cppi41_channel->is_tx ? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM;
+ dma_desc = dmaengine_prep_slave_single(dc, dma_addr, len, direction,
+ DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
+ if (!dma_desc)
+ return false;
+
+ dma_desc->callback = cppi41_dma_callback;
+ dma_desc->callback_param = channel;
+ cppi41_channel->cookie = dma_desc->tx_submit(dma_desc);
+
+ save_rx_toggle(cppi41_channel);
+ dma_async_issue_pending(dc);
+ return true;
+}
+
+static struct dma_channel *cppi41_dma_channel_allocate(struct dma_controller *c,
+ struct musb_hw_ep *hw_ep, u8 is_tx)
+{
+ struct cppi41_dma_controller *controller = container_of(c,
+ struct cppi41_dma_controller, controller);
+ struct cppi41_dma_channel *cppi41_channel = NULL;
+ u8 ch_num = hw_ep->epnum - 1;
+
+ if (ch_num >= MUSB_DMA_NUM_CHANNELS)
+ return NULL;
+
+ if (is_tx)
+ cppi41_channel = &controller->tx_channel[ch_num];
+ else
+ cppi41_channel = &controller->rx_channel[ch_num];
+
+ if (!cppi41_channel->dc)
+ return NULL;
+
+ if (cppi41_channel->is_allocated)
+ return NULL;
+
+ cppi41_channel->hw_ep = hw_ep;
+ cppi41_channel->is_allocated = 1;
+
+ return &cppi41_channel->channel;
+}
+
+static void cppi41_dma_channel_release(struct dma_channel *channel)
+{
+ struct cppi41_dma_channel *cppi41_channel = channel->private_data;
+
+ if (cppi41_channel->is_allocated) {
+ cppi41_channel->is_allocated = 0;
+ channel->status = MUSB_DMA_STATUS_FREE;
+ channel->actual_len = 0;
+ }
+}
+
+static int cppi41_dma_channel_program(struct dma_channel *channel,
+ u16 packet_sz, u8 mode,
+ dma_addr_t dma_addr, u32 len)
+{
+ int ret;
+
+ BUG_ON(channel->status == MUSB_DMA_STATUS_UNKNOWN ||
+ channel->status == MUSB_DMA_STATUS_BUSY);
+
+ channel->status = MUSB_DMA_STATUS_BUSY;
+ channel->actual_len = 0;
+ ret = cppi41_configure_channel(channel, packet_sz, mode, dma_addr, len);
+ if (!ret)
+ channel->status = MUSB_DMA_STATUS_FREE;
+
+ return ret;
+}
+
+static int cppi41_is_compatible(struct dma_channel *channel, u16 maxpacket,
+ void *buf, u32 length)
+{
+ struct cppi41_dma_channel *cppi41_channel = channel->private_data;
+ struct cppi41_dma_controller *controller = cppi41_channel->controller;
+ struct musb *musb = controller->musb;
+
+ if (is_host_active(musb)) {
+ WARN_ON(1);
+ return 1;
+ }
+ return 0;
+}
+
+static int cppi41_dma_channel_abort(struct dma_channel *channel)
+{
+ struct cppi41_dma_channel *cppi41_channel = channel->private_data;
+ struct cppi41_dma_controller *controller = cppi41_channel->controller;
+ struct musb *musb = controller->musb;
+ void __iomem *epio = cppi41_channel->hw_ep->regs;
+ int tdbit;
+ int ret;
+ unsigned is_tx;
+ u16 csr;
+
+ is_tx = cppi41_channel->is_tx;
+ dev_dbg(musb->controller, "abort channel=%d, is_tx=%d\n",
+ cppi41_channel->port_num, is_tx);
+
+ if (cppi41_channel->channel.status == MUSB_DMA_STATUS_FREE)
+ return 0;
+
+ if (is_tx) {
+ csr = musb_readw(epio, MUSB_TXCSR);
+ csr &= ~MUSB_TXCSR_DMAENAB;
+ musb_writew(epio, MUSB_TXCSR, csr);
+ } else {
+ csr = musb_readw(epio, MUSB_RXCSR);
+ csr &= ~(MUSB_RXCSR_H_REQPKT | MUSB_RXCSR_DMAENAB);
+ musb_writew(epio, MUSB_RXCSR, csr);
+
+ csr = musb_readw(epio, MUSB_RXCSR);
+ if (csr & MUSB_RXCSR_RXPKTRDY) {
+ csr |= MUSB_RXCSR_FLUSHFIFO;
+ musb_writew(epio, MUSB_RXCSR, csr);
+ musb_writew(epio, MUSB_RXCSR, csr);
+ }
+ }
+
+ tdbit = 1 << cppi41_channel->port_num;
+ if (is_tx)
+ tdbit <<= 16;
+
+ do {
+ musb_writel(musb->ctrl_base, USB_TDOWN, tdbit);
+ ret = dmaengine_terminate_all(cppi41_channel->dc);
+ } while (ret == -EAGAIN);
+
+ musb_writel(musb->ctrl_base, USB_TDOWN, tdbit);
+
+ if (is_tx) {
+ csr = musb_readw(epio, MUSB_TXCSR);
+ if (csr & MUSB_TXCSR_TXPKTRDY) {
+ csr |= MUSB_TXCSR_FLUSHFIFO;
+ musb_writew(epio, MUSB_TXCSR, csr);
+ }
+ }
+
+ cppi41_channel->channel.status = MUSB_DMA_STATUS_FREE;
+ return 0;
+}
+
+static void cppi41_release_all_dma_chans(struct cppi41_dma_controller *ctrl)
+{
+ struct dma_chan *dc;
+ int i;
+
+ for (i = 0; i < MUSB_DMA_NUM_CHANNELS; i++) {
+ dc = ctrl->tx_channel[i].dc;
+ if (dc)
+ dma_release_channel(dc);
+ dc = ctrl->rx_channel[i].dc;
+ if (dc)
+ dma_release_channel(dc);
+ }
+}
+
+static void cppi41_dma_controller_stop(struct cppi41_dma_controller *controller)
+{
+ cppi41_release_all_dma_chans(controller);
+}
+
+static int cppi41_dma_controller_start(struct cppi41_dma_controller *controller)
+{
+ struct musb *musb = controller->musb;
+ struct device *dev = musb->controller;
+ struct device_node *np = dev->of_node;
+ struct cppi41_dma_channel *cppi41_channel;
+ int count;
+ int i;
+ int ret;
+
+ count = of_property_count_strings(np, "dma-names");
+ if (count < 0)
+ return count;
+
+ for (i = 0; i < count; i++) {
+ struct dma_chan *dc;
+ struct dma_channel *musb_dma;
+ const char *str;
+ unsigned is_tx;
+ unsigned int port;
+
+ ret = of_property_read_string_index(np, "dma-names", i, &str);
+ if (ret)
+ goto err;
+ if (!strncmp(str, "tx", 2))
+ is_tx = 1;
+ else if (!strncmp(str, "rx", 2))
+ is_tx = 0;
+ else {
+ dev_err(dev, "Wrong dmatype %s\n", str);
+ goto err;
+ }
+ ret = kstrtouint(str + 2, 0, &port);
+ if (ret)
+ goto err;
+
+ if (port > MUSB_DMA_NUM_CHANNELS || !port)
+ goto err;
+ if (is_tx)
+ cppi41_channel = &controller->tx_channel[port - 1];
+ else
+ cppi41_channel = &controller->rx_channel[port - 1];
+
+ cppi41_channel->controller = controller;
+ cppi41_channel->port_num = port;
+ cppi41_channel->is_tx = is_tx;
+
+ musb_dma = &cppi41_channel->channel;
+ musb_dma->private_data = cppi41_channel;
+ musb_dma->status = MUSB_DMA_STATUS_FREE;
+ musb_dma->max_len = SZ_4M;
+
+ dc = dma_request_slave_channel(dev, str);
+ if (!dc) {
+ dev_err(dev, "Falied to request %s.\n", str);
+ goto err;
+ }
+ cppi41_channel->dc = dc;
+ }
+ return 0;
+err:
+ cppi41_release_all_dma_chans(controller);
+ return -EINVAL;
+}
+
+void dma_controller_destroy(struct dma_controller *c)
+{
+ struct cppi41_dma_controller *controller = container_of(c,
+ struct cppi41_dma_controller, controller);
+
+ cppi41_dma_controller_stop(controller);
+ kfree(controller);
+}
+
+struct dma_controller *dma_controller_create(struct musb *musb,
+ void __iomem *base)
+{
+ struct cppi41_dma_controller *controller;
+ int ret;
+
+ if (!musb->controller->of_node) {
+ dev_err(musb->controller, "Need DT for the DMA engine.\n");
+ return NULL;
+ }
+
+ controller = kzalloc(sizeof(*controller), GFP_KERNEL);
+ if (!controller)
+ goto kzalloc_fail;
+
+ controller->musb = musb;
+
+ controller->controller.channel_alloc = cppi41_dma_channel_allocate;
+ controller->controller.channel_release = cppi41_dma_channel_release;
+ controller->controller.channel_program = cppi41_dma_channel_program;
+ controller->controller.channel_abort = cppi41_dma_channel_abort;
+ controller->controller.is_compatible = cppi41_is_compatible;
+
+ ret = cppi41_dma_controller_start(controller);
+ if (ret)
+ goto plat_get_fail;
+ return &controller->controller;
+
+plat_get_fail:
+ kfree(controller);
+kzalloc_fail:
+ return NULL;
+}
projects / deliverable / linux.git / commitdiff
