[PATCH v2 10/10] usb: musb: tusb6010_omap: Convert to DMAengine API

Peter Ujfalusi
2017-05-10T08:52:02Z

With the port_window support in DMAengine and the sDMA driver we can
convert the driver to DMAengine.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
---
drivers/usb/musb/tusb6010_omap.c | 201 ++++++++++++++++-----------------------
1 file changed, 80 insertions(+), 121 deletions(-)

diff --git a/drivers/usb/musb/tusb6010_omap.c b/drivers/usb/musb/tusb6010_omap.c
index 34e0115a4629..0c2bd0befe72 100644
--- a/drivers/usb/musb/tusb6010_omap.c
+++ b/drivers/usb/musb/tusb6010_omap.c
@@ -15,7 +15,7 @@
#include <linux/platform_device.h>
#include <linux/dma-mapping.h>
#include <linux/slab.h>
-#include <linux/omap-dma.h>
+#include <linux/dmaengine.h>

#include "musb_core.h"
#include "tusb6010.h"
@@ -24,17 +24,9 @@

#define MAX_DMAREQ 5 /* REVISIT: Really 6, but req5 not OK */

-#define OMAP24XX_DMA_EXT_DMAREQ0 2
-#define OMAP24XX_DMA_EXT_DMAREQ1 3
-#define OMAP242X_DMA_EXT_DMAREQ2 14
-#define OMAP242X_DMA_EXT_DMAREQ3 15
-#define OMAP242X_DMA_EXT_DMAREQ4 16
-#define OMAP242X_DMA_EXT_DMAREQ5 64
-
struct tusb_dma_data {
- int ch;
s8 dmareq;
- s8 sync_dev;
+ struct dma_chan *chan;
};

struct tusb_omap_dma_ch {
@@ -105,7 +97,7 @@ static inline void tusb_omap_free_shared_dmareq(struct tusb_omap_dma_ch *chdat)
* See also musb_dma_completion in plat_uds.c and musb_g_[tx|rx]() in
* musb_gadget.c.
*/
-static void tusb_omap_dma_cb(int lch, u16 ch_status, void *data)
+static void tusb_omap_dma_cb(void *data)
{
struct dma_channel *channel = (struct dma_channel *)data;
struct tusb_omap_dma_ch *chdat = to_chdat(channel);
@@ -116,18 +108,11 @@ static void tusb_omap_dma_cb(int lch, u16 ch_status, void *data)
void __iomem *ep_conf = hw_ep->conf;
void __iomem *mbase = musb->mregs;
unsigned long remaining, flags, pio;
- int ch;

spin_lock_irqsave(&musb->lock, flags);

- ch = chdat->dma_data->ch;
-
- if (ch_status != OMAP_DMA_BLOCK_IRQ)
- printk(KERN_ERR "TUSB DMA error status: %i\n", ch_status);
-
- dev_dbg(musb->controller, "ep%i %s dma callback ch: %i status: %x\n",
- chdat->epnum, chdat->tx ? "tx" : "rx",
- ch, ch_status);
+ dev_dbg(musb->controller, "ep%i %s dma callback\n",
+ chdat->epnum, chdat->tx ? "tx" : "rx");

if (chdat->tx)
remaining = musb_readl(ep_conf, TUSB_EP_TX_OFFSET);
@@ -138,8 +123,8 @@ static void tusb_omap_dma_cb(int lch, u16 ch_status, void *data)

/* HW issue #10: XFR_SIZE may get corrupt on DMA (both async & sync) */
if (unlikely(remaining > chdat->transfer_len)) {
- dev_dbg(musb->controller, "Corrupt %s dma ch%i XFR_SIZE: 0x%08lx\n",
- chdat->tx ? "tx" : "rx", ch, remaining);
+ dev_dbg(musb->controller, "Corrupt %s XFR_SIZE: 0x%08lx\n",
+ chdat->tx ? "tx" : "rx", remaining);
remaining = 0;
}

@@ -206,12 +191,15 @@ static int tusb_omap_dma_program(struct dma_channel *channel, u16 packet_sz,
struct musb_hw_ep *hw_ep = chdat->hw_ep;
void __iomem *mbase = musb->mregs;
void __iomem *ep_conf = hw_ep->conf;
- dma_addr_t fifo = hw_ep->fifo_sync;
- struct omap_dma_channel_params dma_params;
+ dma_addr_t fifo_addr = hw_ep->fifo_sync;
u32 dma_remaining;
- int src_burst, dst_burst;
u16 csr;
struct tusb_dma_data *dma_data;
+ struct dma_async_tx_descriptor *dma_desc;
+ struct dma_slave_config dma_cfg;
+ enum dma_transfer_direction dma_dir;
+ u32 port_window;
+ int ret;

if (unlikely(dma_addr & 0x1) || (len < 32) || (len > packet_sz))
return false;
@@ -237,10 +225,8 @@ static int tusb_omap_dma_program(struct dma_channel *channel, u16 packet_sz,

dma_remaining = TUSB_EP_CONFIG_XFR_SIZE(dma_remaining);
if (dma_remaining) {
- dev_dbg(musb->controller, "Busy %s dma ch%i, not using: %08x\n",
- chdat->tx ? "tx" : "rx",
- chdat->dma_data ? chdat->dma_data->ch : -1,
- dma_remaining);
+ dev_dbg(musb->controller, "Busy %s dma, not using: %08x\n",
+ chdat->tx ? "tx" : "rx", dma_remaining);
return false;
}

@@ -257,7 +243,7 @@ static int tusb_omap_dma_program(struct dma_channel *channel, u16 packet_sz,
dev_dbg(musb->controller, "could not get dma for ep%i\n", chdat->epnum);
return false;
}
- if (dma_data->ch < 0) {
+ if (dma_data->dmareq < 0) {
/* REVISIT: This should get blocked earlier, happens
* with MSC ErrorRecoveryTest
*/
@@ -266,8 +252,6 @@ static int tusb_omap_dma_program(struct dma_channel *channel, u16 packet_sz,
}
}

- omap_set_dma_callback(dma_data->ch, tusb_omap_dma_cb, channel);
-
chdat->packet_sz = packet_sz;
chdat->len = len;
channel->actual_len = 0;
@@ -275,79 +259,68 @@ static int tusb_omap_dma_program(struct dma_channel *channel, u16 packet_sz,
channel->status = MUSB_DMA_STATUS_BUSY;

/* Since we're recycling dma areas, we need to clean or invalidate */
- if (chdat->tx)
+ if (chdat->tx) {
+ dma_dir = DMA_MEM_TO_DEV;
dma_map_single(dev, phys_to_virt(dma_addr), len,
DMA_TO_DEVICE);
- else
+ } else {
+ dma_dir = DMA_DEV_TO_MEM;
dma_map_single(dev, phys_to_virt(dma_addr), len,
DMA_FROM_DEVICE);
+ }
+
+ memset(&dma_cfg, 0, sizeof(dma_cfg));

/* Use 16-bit transfer if dma_addr is not 32-bit aligned */
if ((dma_addr & 0x3) == 0) {
- dma_params.data_type = OMAP_DMA_DATA_TYPE_S32;
- dma_params.elem_count = 8; /* Elements in frame */
+ dma_cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
+ dma_cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
+ port_window = 8;
} else {
- dma_params.data_type = OMAP_DMA_DATA_TYPE_S16;
- dma_params.elem_count = 16; /* Elements in frame */
- fifo = hw_ep->fifo_async;
- }
+ dma_cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
+ dma_cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
+ port_window = 16;

- dma_params.frame_count = chdat->transfer_len / 32; /* Burst sz frame */
+ fifo_addr = hw_ep->fifo_async;
+ }

- dev_dbg(musb->controller, "ep%i %s dma ch%i dma: %pad len: %u(%u) packet_sz: %i(%i)\n",
- chdat->epnum, chdat->tx ? "tx" : "rx",
- dma_data->ch, &dma_addr, chdat->transfer_len, len,
- chdat->transfer_packet_sz, packet_sz);
+ dev_dbg(musb->controller,
+ "ep%i %s dma: %pad len: %u(%u) packet_sz: %i(%i)\n",
+ chdat->epnum, chdat->tx ? "tx" : "rx", &dma_addr,
+ chdat->transfer_len, len, chdat->transfer_packet_sz, packet_sz);
+
+ dma_cfg.src_addr = fifo_addr;
+ dma_cfg.dst_addr = fifo_addr;
+ dma_cfg.src_port_window_size = port_window;
+ dma_cfg.src_maxburst = port_window;
+ dma_cfg.dst_port_window_size = port_window;
+ dma_cfg.dst_maxburst = port_window;
+
+ ret = dmaengine_slave_config(dma_data->chan, &dma_cfg);
+ if (ret) {
+ dev_err(musb->controller, "DMA slave config failed: %d\n", ret);
+ return false;
+ }

- /*
- * Prepare omap DMA for transfer
- */
- if (chdat->tx) {
- dma_params.src_amode = OMAP_DMA_AMODE_POST_INC;
- dma_params.src_start = (unsigned long)dma_addr;
- dma_params.src_ei = 0;
- dma_params.src_fi = 0;
-
- dma_params.dst_amode = OMAP_DMA_AMODE_DOUBLE_IDX;
- dma_params.dst_start = (unsigned long)fifo;
- dma_params.dst_ei = 1;
- dma_params.dst_fi = -31; /* Loop 32 byte window */
-
- dma_params.trigger = dma_data->sync_dev;
- dma_params.sync_mode = OMAP_DMA_SYNC_FRAME;
- dma_params.src_or_dst_synch = 0; /* Dest sync */
-
- src_burst = OMAP_DMA_DATA_BURST_16; /* 16x32 read */
- dst_burst = OMAP_DMA_DATA_BURST_8; /* 8x32 write */
- } else {
- dma_params.src_amode = OMAP_DMA_AMODE_DOUBLE_IDX;
- dma_params.src_start = (unsigned long)fifo;
- dma_params.src_ei = 1;
- dma_params.src_fi = -31; /* Loop 32 byte window */
-
- dma_params.dst_amode = OMAP_DMA_AMODE_POST_INC;
- dma_params.dst_start = (unsigned long)dma_addr;
- dma_params.dst_ei = 0;
- dma_params.dst_fi = 0;
-
- dma_params.trigger = dma_data->sync_dev;
- dma_params.sync_mode = OMAP_DMA_SYNC_FRAME;
- dma_params.src_or_dst_synch = 1; /* Source sync */
-
- src_burst = OMAP_DMA_DATA_BURST_8; /* 8x32 read */
- dst_burst = OMAP_DMA_DATA_BURST_16; /* 16x32 write */
+ dma_desc = dmaengine_prep_slave_single(dma_data->chan, dma_addr,
+ chdat->transfer_len, dma_dir,
+ DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
+ if (!dma_desc) {
+ dev_err(musb->controller, "DMA prep_slave_single failed\n");
+ return false;
}

- dev_dbg(musb->controller, "ep%i %s using %i-bit %s dma from 0x%08lx to 0x%08lx\n",
+ dma_desc->callback = tusb_omap_dma_cb;
+ dma_desc->callback_param = channel;
+ dmaengine_submit(dma_desc);
+
+ dev_dbg(musb->controller,
+ "ep%i %s using %i-bit %s dma from %pad to %pad\n",
chdat->epnum, chdat->tx ? "tx" : "rx",
- (dma_params.data_type == OMAP_DMA_DATA_TYPE_S32) ? 32 : 16,
+ dma_cfg.src_addr_width * 8,
((dma_addr & 0x3) == 0) ? "sync" : "async",
- dma_params.src_start, dma_params.dst_start);
-
- omap_set_dma_params(dma_data->ch, &dma_params);
- omap_set_dma_src_burst_mode(dma_data->ch, src_burst);
- omap_set_dma_dest_burst_mode(dma_data->ch, dst_burst);
- omap_set_dma_write_mode(dma_data->ch, OMAP_DMA_WRITE_LAST_NON_POSTED);
+ (dma_dir == DMA_MEM_TO_DEV) ? &dma_addr : &fifo_addr,
+ (dma_dir == DMA_MEM_TO_DEV) ? &fifo_addr : &dma_addr);

/*
* Prepare MUSB for DMA transfer
@@ -367,10 +340,8 @@ static int tusb_omap_dma_program(struct dma_channel *channel, u16 packet_sz,
csr | MUSB_RXCSR_P_WZC_BITS);
}

- /*
- * Start DMA transfer
- */
- omap_start_dma(dma_data->ch);
+ /* Start DMA transfer */
+ dma_async_issue_pending(dma_data->chan);

if (chdat->tx) {
/* Send transfer_packet_sz packets at a time */
@@ -400,7 +371,7 @@ static int tusb_omap_dma_abort(struct dma_channel *channel)
struct tusb_omap_dma_ch *chdat = to_chdat(channel);

if (chdat->dma_data)
- omap_stop_dma(chdat->dma_data->ch);
+ dmaengine_terminate_all(chdat->dma_data->chan);

channel->status = MUSB_DMA_STATUS_FREE;

@@ -510,11 +481,11 @@ tusb_omap_dma_allocate(struct dma_controller *c,

dma_data = chdat->dma_data;

- dev_dbg(musb->controller, "ep%i %s dma: %s dma%i dmareq%i sync%i\n",
+ dev_dbg(musb->controller, "ep%i %s dma: %s dmareq%i\n",
chdat->epnum,
chdat->tx ? "tx" : "rx",
tusb_dma->multichannel ? "shared" : "dedicated",
- dma_data->ch, dma_data->dmareq, dma_data->sync_dev);
+ dma_data->dmareq);

return channel;

@@ -532,12 +503,11 @@ static void tusb_omap_dma_release(struct dma_channel *channel)
struct tusb_omap_dma_ch *chdat = to_chdat(channel);
struct musb *musb = chdat->musb;

- dev_dbg(musb->controller, "ep%i ch%i\n", chdat->epnum,
- chdat->dma_data->ch);
+ dev_dbg(musb->controller, "Release for ep%i\n", chdat->epnum);

channel->status = MUSB_DMA_STATUS_UNKNOWN;

- omap_stop_dma(chdat->dma_data->ch);
+ dmaengine_terminate_sync(chdat->dma_data->chan);
tusb_omap_dma_free_dmareq(chdat);

channel = NULL;
@@ -557,8 +527,8 @@ void tusb_dma_controller_destroy(struct dma_controller *c)
}

/* Free up the DMA channels */
- if (tusb_dma && tusb_dma->dma_pool[i].ch >= 0)
- omap_free_dma(tusb_dma->dma_pool[i].ch);
+ if (tusb_dma && tusb_dma->dma_pool[i].chan)
+ dma_release_channel(tusb_dma->dma_pool[i].chan);
}

kfree(tusb_dma);
@@ -567,16 +537,9 @@ EXPORT_SYMBOL_GPL(tusb_dma_controller_destroy);

static int tusb_omap_allocate_dma_pool(struct tusb_omap_dma *tusb_dma)
{
+ struct musb *musb = tusb_dma->controller.musb;
int i;
int ret = 0;
- const int sync_dev[6] = {
- OMAP24XX_DMA_EXT_DMAREQ0,
- OMAP24XX_DMA_EXT_DMAREQ1,
- OMAP242X_DMA_EXT_DMAREQ2,
- OMAP242X_DMA_EXT_DMAREQ3,
- OMAP242X_DMA_EXT_DMAREQ4,
- OMAP242X_DMA_EXT_DMAREQ5,
- };

for (i = 0; i < MAX_DMAREQ; i++) {
struct tusb_dma_data *dma_data = &tusb_dma->dma_pool[i];
@@ -590,22 +553,18 @@ static int tusb_omap_allocate_dma_pool(struct tusb_omap_dma *tusb_dma)
char ch_name[8];

sprintf(ch_name, "dmareq%d", i);
- dma_data->sync_dev = sync_dev[i];
- dma_data->ch = -1;
- /* callback data is ngoing to be set later */
- ret = omap_request_dma(dma_data->sync_dev, ch_name,
- tusb_omap_dma_cb, NULL, &dma_data->ch);
- if (ret != 0) {
- dev_err(tusb_dma->controller.musb->controller,
+ dma_data->chan = dma_request_chan(musb->controller,
+ ch_name);
+ if (IS_ERR(dma_data->chan)) {
+ dev_err(musb->controller,
"Failed to request %s\n", ch_name);
+ ret = PTR_ERR(dma_data->chan);
goto dma_error;
}

dma_data->dmareq = i;
} else {
dma_data->dmareq = -1;
- dma_data->sync_dev = -1;
- dma_data->ch = -1;
}
}

@@ -615,8 +574,8 @@ static int tusb_omap_allocate_dma_pool(struct tusb_omap_dma *tusb_dma)
for (; i >= 0; i--) {
struct tusb_dma_data *dma_data = &tusb_dma->dma_pool[i];

- if (dma_data->ch >= 0)
- omap_free_dma(dma_data->ch);
+ if (dma_data->dmareq >= 0)
+ dma_release_channel(dma_data->chan);
}

return ret;
--
2.12.2