[RFC 1/2] usb/musb dma: add cppi41 dma driver

Sebastian Andrzej Siewior
2013-07-05T16:13:35Z

This is a first shot of the cppi41 DMA driver. It is currently used by
a new musb dma-engine implementation. I have to test it somehow.

The state of the cpp41 (and the using dmaengine) is in very early stage.
I was able to send TX packets over DMA and enumerate an USB masstorage
device.
Things that need to be taken care of:
- RX path
- cancel of transfers
- dynamic descriptor allocation
- re-think the current device tree nodes.
Currently a node looks like:
&cppi41dma X Y Z Q
that means:
- X: dma channel
- Y: RX/TX
- Z: start queue
- Q: complete queue
Each value number is hardwired with the USB endpoint it is using. The
DMA channels are hardwired with USB endpoints and the start/complete
is hardwired with the DMA channel.

I add each DMA channel twice: once for RX the other for TX (that is why
I need the direction (Y) uppon lookup).
The RX/TX channel can be used simultaneously i.e. program & start RX,
program & start TX and TX can complete before RX.
Currently I think that it would be best to remove the queue logic from
the device and put it into the driver.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
arch/arm/boot/dts/am33xx.dtsi | 50 +++
drivers/dma/Kconfig | 9 +
drivers/dma/Makefile | 1 +
drivers/dma/cppi41.c | 777 +++++++++++++++++++++++++++++++++++++++++
drivers/usb/musb/Kconfig | 4 +
drivers/usb/musb/Makefile | 1 +
drivers/usb/musb/musb_dma.h | 2 +-
drivers/usb/musb/musb_dmaeng.c | 294 ++++++++++++++++
8 files changed, 1137 insertions(+), 1 deletion(-)
create mode 100644 drivers/dma/cppi41.c
create mode 100644 drivers/usb/musb/musb_dmaeng.c

diff --git a/arch/arm/boot/dts/am33xx.dtsi b/arch/arm/boot/dts/am33xx.dtsi
index bb2298c..fc29b54 100644
--- a/arch/arm/boot/dts/am33xx.dtsi
+++ b/arch/arm/boot/dts/am33xx.dtsi
@@ -349,6 +349,18 @@
status = "disabled";
};

+ cppi41dma: dma@07402000 {
+ compatible = "ti,am3359-cppi41";
+ reg = <0x47400000 0x1000 /* usbss */
+ 0x47402000 0x1000 /* controller */
+ 0x47403000 0x1000 /* scheduler */
+ 0x47404000 0x4000>; /* queue manager */
+ interrupts = <17>;
+ #dma-cells = <4>;
+ #dma-channels = <30>;
+ #dma-requests = <256>;
+ };
+
musb: usb@47400000 {
compatible = "ti,musb-am33xx";
reg = <0x47400000 0x1000>;
@@ -383,6 +395,44 @@
power = <250>;
phys = <&musb1_phy>;
status = "disabled";
+ dmas = <&cppi41dma 15 0 16 141
+ &cppi41dma 16 0 17 142
+ &cppi41dma 17 0 18 143
+ &cppi41dma 18 0 19 144
+ &cppi41dma 19 0 20 145
+ &cppi41dma 20 0 21 146
+ &cppi41dma 21 0 22 147
+ &cppi41dma 22 0 23 148
+ &cppi41dma 23 0 24 149
+ &cppi41dma 24 0 25 150
+ &cppi41dma 25 0 26 151
+ &cppi41dma 26 0 27 152
+ &cppi41dma 27 0 28 153
+ &cppi41dma 28 0 29 154
+ &cppi41dma 29 0 30 155
+
+ &cppi41dma 15 1 62 125
+ &cppi41dma 16 1 64 126
+ &cppi41dma 17 1 66 127
+ &cppi41dma 18 1 68 128
+ &cppi41dma 19 1 70 129
+ &cppi41dma 20 1 72 130
+ &cppi41dma 21 1 74 131
+ &cppi41dma 22 1 76 132
+ &cppi41dma 23 1 78 133
+ &cppi41dma 24 1 80 134
+ &cppi41dma 25 1 82 135
+ &cppi41dma 26 1 84 136
+ &cppi41dma 27 1 86 137
+ &cppi41dma 28 1 88 138
+ &cppi41dma 29 1 90 139>;
+ dma-names =
+ "rx1", "rx2", "rx3", "rx4", "rx5", "rx6", "rx7",
+ "rx8", "rx9", "rx10", "rx11", "rx12", "rx13",
+ "rx14", "rx15",
+ "tx1", "tx2", "tx3", "tx4", "tx5", "tx6", "tx7",
+ "tx8", "tx9", "tx10", "tx11", "tx12", "tx13",
+ "tx14", "tx15";
};
};

diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig
index 3215a3c..c19a593 100644
--- a/drivers/dma/Kconfig
+++ b/drivers/dma/Kconfig
@@ -305,6 +305,15 @@ config DMA_OMAP
select DMA_ENGINE
select DMA_VIRTUAL_CHANNELS

+config TI_CPPI41
+ tristate "AM33xx CPPI41 DMA support"
+ depends on ARCH_OMAP
+ select DMA_ENGINE
+ select DMA_VIRTUAL_CHANNELS
+ help
+ The Communications Port Programming Interface (CPPI) 4.1 DMA engine
+ is currently used by the MUSB driver on AM335x platforms.
+
config MMP_PDMA
bool "MMP PDMA support"
depends on (ARCH_MMP || ARCH_PXA)
diff --git a/drivers/dma/Makefile b/drivers/dma/Makefile
index a2b0df5..6ce6ac8 100644
--- a/drivers/dma/Makefile
+++ b/drivers/dma/Makefile
@@ -38,3 +38,4 @@ obj-$(CONFIG_DMA_SA11X0) += sa11x0-dma.o
obj-$(CONFIG_MMP_TDMA) += mmp_tdma.o
obj-$(CONFIG_DMA_OMAP) += omap-dma.o
obj-$(CONFIG_MMP_PDMA) += mmp_pdma.o
+obj-$(CONFIG_TI_CPPI41) += cppi41.o
diff --git a/drivers/dma/cppi41.c b/drivers/dma/cppi41.c
new file mode 100644
index 0000000..80dcb56
--- /dev/null
+++ b/drivers/dma/cppi41.c
@@ -0,0 +1,777 @@
+#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_TX_RX 16
+#define TD_DESC_DMA_NUM 10
+
+/* USB SS */
+#define USBSS_IRQ_STATUS (0x28)
+#define USBSS_IRQ_ENABLER (0x2c)
+#define USBSS_IRQ_CLEARR (0x30)
+
+#define USBSS_IRQ_RX1 (1 << 11)
+#define USBSS_IRQ_TX1 (1 << 10)
+#define USBSS_IRQ_RX0 (1 << 9)
+#define USBSS_IRQ_TX0 (1 << 8)
+#define USBSS_IRQ_PD_COMP (1 << 2)
+
+#define USBSS_IRQ_RXTX1 (USBSS_IRQ_RX1 | USBSS_IRQ_TX1)
+#define USBSS_IRQ_RXTX0 (USBSS_IRQ_RX0 | USBSS_IRQ_TX0)
+#define USBSS_IRQ_RXTX01 (USBSS_IRQ_RXTX0 | USBSS_IRQ_RXTX1)
+
+/* DMA engine */
+#define DMA_TXGCR(x) (0x800 + (x) * 0x20)
+#define DMA_RXGCR(x) (0x808 + (x) * 0x20)
+
+#define GCR_CHAN_ENABLE (1 << 31)
+
+/* 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_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)
+
+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;
+
+ unsigned int q_num;
+ unsigned int q_comp_num;
+ unsigned int port_num;
+};
+
+struct cppi41_common_desc {
+ u32 pd0;
+ u32 pd1;
+ u32 pd2;
+ u32 pd3;
+ u32 pd4;
+ u32 pd5;
+ u32 pd6;
+ u32 pd7;
+} __packed __aligned(32);
+
+struct cppi41_desc {
+ struct cppi41_common_desc d;
+} __aligned(32);
+
+struct cppi41_dd {
+ struct dma_device ddev;
+
+ void *qmgr_scratch;
+ dma_addr_t scratch_phys;
+
+ struct cppi41_desc *cd;
+ dma_addr_t descs_phys;
+ 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;
+};
+
+static u32 compute_td_desc(unsigned is_rx, unsigned dma, unsigned chan)
+{
+ u32 val;
+
+ val = DESC_TYPE_TEARD << DESC_TYPE;
+ val |= (!!is_rx) << TD_DESC_TX_RX;
+ val |= dma << TD_DESC_DMA_NUM;
+ val |= chan;
+ return chan;
+}
+
+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)
+{
+ writel(val, mem);
+}
+
+static u32 cppi_readl(void *__iomem *mem)
+{
+ u32 val;
+ val = readl(mem);
+ return val;
+}
+
+#define QMGR_NUM_PEND 5
+#define QMGR_PEND(x) (0x90 + (x) * 4)
+
+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;
+ for (i = 0; i < QMGR_NUM_PEND; i++) {
+ u32 val;
+ u32 q_num;
+
+ val = cppi_readl(cdd->qmgr_mem + QMGR_PEND(i));
+ 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;
+ pr_err("%s(%d) Found %u => %08x\n", __func__, __LINE__,
+ q_num, desc);
+ c = desc_to_chan(cdd, desc);
+ if (!c) {
+ /* XXX */
+ continue;
+ }
+ dma_cookie_complete(&c->txd);
+ c->txd.callback(c->txd.callback_param);
+ }
+ }
+ cppi_writel(status, cdd->usbss_mem + USBSS_IRQ_STATUS);
+ 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;
+ return 0;
+}
+
+static void cppi41_dma_free_chan_resources(struct dma_chan *chan)
+{
+ pr_err("%s(%d)\n", __func__, __LINE__);
+}
+
+static enum dma_status cppi41_dma_tx_status(struct dma_chan *chan,
+ dma_cookie_t cookie, struct dma_tx_state *txstate)
+{
+ enum dma_status ret;
+
+ /* lock */
+ ret = dma_cookie_status(chan, cookie, txstate);
+ /* unlock */
+
+ return ret;
+}
+
+static void push_desc_queue(struct cppi41_channel *cppi41_chan)
+{
+ struct cppi41_dd *cdd = cppi41_chan->cdd;
+ u32 desc_num;
+ u32 desc_phys;
+ u32 reg;
+
+ desc_phys = lower_32_bits(cppi41_chan->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] = cppi41_chan;
+
+ reg = (sizeof(struct cppi41_desc) - 24) / 4;
+ reg |= desc_phys;
+ cppi_writel(reg, cdd->qmgr_mem + QMGR_QUEUE_D(cppi41_chan->q_num));
+}
+
+static void cppi41_dma_issue_pending(struct dma_chan *chan)
+{
+ struct cppi41_channel *cppi41_chan = to_cpp41_chan(chan);
+ u32 reg;
+
+ pr_err("%s() chan addr %p q %d c %d p %d\n", __func__,
+ cppi41_chan->gcr_reg,
+ cppi41_chan->q_num,
+ cppi41_chan->q_comp_num,
+ cppi41_chan->port_num);
+
+ reg = GCR_CHAN_ENABLE;
+// reg |= cppi41_chan->q_num;
+ if (!cppi41_chan->is_tx)
+ reg |= 1 << 14; /* host format */
+
+ cppi_writel(reg, cppi41_chan->gcr_reg);
+
+ dsb();
+ push_desc_queue(cppi41_chan);
+}
+
+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 = 5 << 26; /* USB TYPE */
+ 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 = 1 << 31; /* XXX PD complete interrupt */
+ 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;
+
+ /* XXX at some point we might to want to setup more than one desc */
+ BUG_ON(num > 0);
+ addr = lower_32_bits(sg_dma_address(sg));
+ len = sg_dma_len(sg);
+
+ d->d.pd0 = get_host_pd0(len);
+ d->d.pd1 = get_host_pd1(c);
+ d->d.pd2 = get_host_pd2(c);
+ d->d.pd3 = get_host_pd3(len);
+ d->d.pd4 = get_host_pd4_or_7(addr);
+ d->d.pd5 = get_host_pd5();
+ d->d.pd6 = get_host_pd6(len);
+ d->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 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;
+#if 0
+ case DMA_TERMINATE_ALL:
+ ret = 0;
+ break;
+
+ case DMA_PAUSE:
+ ret = 0;
+ break;
+
+ case DMA_RESUME:
+ ret = 0;
+ break;
+#endif
+ 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 * 2];
+ cchan->desc_phys = cdd->descs_phys;
+ cchan->desc_phys += i * 2 * sizeof(struct cppi41_desc);
+ cchan->chan.device = &cdd->ddev;
+ list_add_tail(&cchan->chan.device_node, &cdd->ddev.channels);
+ }
+ 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;
+
+ init_sched(cdd);
+ return 0;
+err_td:
+ deinit_cpii41(pdev, cdd);
+ return ret;
+}
+
+static struct platform_driver cpp41_dma_driver;
+/*
+ * The param format is:
+ * Q X Y Z
+ * Q: Port
+ * X: 0 = RX else TX
+ * Y: queue number
+ * Z: queue complete number
+ */
+#define INFO_PORT 0
+#define INFO_IS_TX 1
+#define INFO_QUEUE_NUM 2
+#define INFO_QUEUEC_NUM 3
+
+static bool cpp41_dma_filter_fn(struct dma_chan *chan, void *param)
+{
+ struct cppi41_channel *cchan;
+ 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;
+
+ cchan->q_num = num[INFO_QUEUE_NUM];
+ cchan->q_comp_num = num[INFO_QUEUEC_NUM];
+ return true;
+}
+
+static struct of_dma_filter_info cpp41_dma_info = {
+ .filter_fn = cpp41_dma_filter_fn,
+};
+
+/* a little advanced */
+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 != 4)
+ return NULL;
+
+ return dma_request_channel(info->dma_cap, info->filter_fn,
+ &dma_spec->args[0]);
+}
+
+static int cppi41_dma_probe(struct platform_device *pdev)
+{
+ struct cppi41_dd *cdd;
+ int irq;
+ int ret;
+
+ 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;
+ }
+
+ 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, cppi41_irq, IRQF_SHARED, "cppi41", 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);
+ dev_err(&pdev->dev, "finally\n");
+ 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 const struct of_device_id cppi41_dma_ids[] = {
+ { .compatible = "ti,am3359-cppi41", },
+ {},
+};
+MODULE_DEVICE_TABLE(of, cppi41_dma_ids);
+
+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");
diff --git a/drivers/usb/musb/Kconfig b/drivers/usb/musb/Kconfig
index 797e3fd..9d74a93 100644
--- a/drivers/usb/musb/Kconfig
+++ b/drivers/usb/musb/Kconfig
@@ -125,6 +125,10 @@ config USB_TI_CPPI_DMA
help
Enable DMA transfers when TI CPPI DMA is available.

+config USB_TI_CPPI41_DMA
+ bool 'TI CPPI 4.1 (AM335x)'
+ depends on ARCH_OMAP
+
config USB_TUSB_OMAP_DMA
bool 'TUSB 6010'
depends on USB_MUSB_TUSB6010
diff --git a/drivers/usb/musb/Makefile b/drivers/usb/musb/Makefile
index 2b82ed7..c9eb245 100644
--- a/drivers/usb/musb/Makefile
+++ b/drivers/usb/musb/Makefile
@@ -29,3 +29,4 @@ musb_hdrc-$(CONFIG_USB_INVENTRA_DMA) += musbhsdma.o
musb_hdrc-$(CONFIG_USB_TI_CPPI_DMA) += cppi_dma.o
musb_hdrc-$(CONFIG_USB_TUSB_OMAP_DMA) += tusb6010_omap.o
musb_hdrc-$(CONFIG_USB_UX500_DMA) += ux500_dma.o
+musb_hdrc-$(CONFIG_USB_TI_CPPI41_DMA) += musb_dmaeng.o
diff --git a/drivers/usb/musb/musb_dma.h b/drivers/usb/musb/musb_dma.h
index c8e67fd..bfe2993 100644
--- a/drivers/usb/musb/musb_dma.h
+++ b/drivers/usb/musb/musb_dma.h
@@ -71,7 +71,7 @@ struct musb_hw_ep;
#ifdef CONFIG_USB_TI_CPPI_DMA
#define is_cppi_enabled() 1
#else
-#define is_cppi_enabled() 0
+#define is_cppi_enabled() 1
#endif

#ifdef CONFIG_USB_TUSB_OMAP_DMA
diff --git a/drivers/usb/musb/musb_dmaeng.c b/drivers/usb/musb/musb_dmaeng.c
new file mode 100644
index 0000000..c12f42a
--- /dev/null
+++ b/drivers/usb/musb/musb_dmaeng.c
@@ -0,0 +1,294 @@
+#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"
+
+struct cppi41_dma_channel {
+ struct dma_channel channel;
+ struct cppi41_dma_controller *controller;
+ struct musb_hw_ep *hw_ep;
+ struct dma_chan *dc;
+ unsigned int cur_len;
+ dma_cookie_t cookie;
+ u8 port_num;
+ u8 is_tx;
+ u8 is_allocated;
+};
+
+#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;
+};
+
+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;
+
+ dev_err(musb->controller, "DMA transfer done on hw_ep=%d\n",
+ hw_ep->epnum);
+
+ spin_lock_irqsave(&musb->lock, flags);
+ cppi41_channel->channel.actual_len = cppi41_channel->cur_len;
+ cppi41_channel->channel.status = MUSB_DMA_STATUS_FREE;
+ musb_dma_completion(musb, hw_ep->epnum, cppi41_channel->is_tx);
+ spin_unlock_irqrestore(&musb->lock, flags);
+}
+
+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;
+
+ dev_err(musb->controller,
+ "configure packet_sz=%d, mode=%d, dma_addr=0x%llx, len=%d is_tx=%d\n",
+ packet_sz, mode, (unsigned long long) dma_addr,
+ len, cppi41_channel->is_tx);
+
+ cppi41_channel->cur_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);
+
+ 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;
+ struct musb *musb = controller->musb;
+ u8 ch_num = hw_ep->epnum - 1;
+
+ if (ch_num >= MUSB_DMA_NUM_CHANNELS)
+ return NULL;
+
+ if (!is_tx)
+ 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;
+
+ dev_err(musb->controller, "alloc hw_ep=%d, is_tx=0x%x, port=%d\n",
+ hw_ep->epnum, is_tx,
+ cppi41_channel->port_num);
+
+ return &cppi41_channel->channel;
+}
+
+static void cppi41_dma_channel_release(struct dma_channel *channel)
+{
+ struct cppi41_dma_channel *cppi41_channel = channel->private_data;
+ struct musb *musb = cppi41_channel->controller->musb;
+
+ dev_err(musb->controller, "release channel=%d\n", cppi41_channel->port_num);
+
+ 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_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;
+
+ dev_err(musb->controller, "abort channel=%d, is_tx=%d\n",
+ cppi41_channel->port_num, cppi41_channel->is_tx);
+ 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;
+ dma_cap_mask_t mask;
+
+ dma_cap_zero(mask);
+ dma_cap_set(DMA_SLAVE, mask);
+
+ 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;
+
+#if 0
+ XXX just in case
+ ret = dc->device->device_control(dc, DMA_SLAVE_CONFIG,
+ (unsigned long) &cfg);
+ if (ret)
+ goto err;
+#endif
+ }
+ 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;
+
+ ret = cppi41_dma_controller_start(controller);
+ if (ret)
+ goto plat_get_fail;
+ return &controller->controller;
+
+plat_get_fail:
+ kfree(controller);
+kzalloc_fail:
+ return NULL;
+}
--
1.8.3.2