[PATCH v2 06/10] usb: musb: tusb6010_omap: Create new struct for DMA data/parameters

Peter Ujfalusi
2017-05-10T08:43:44Z

For the DMA we have ch (channel), dmareq and sync_dev parameters both
within the tusb_omap_dma_ch and tusb_omap_dma_ch struct.
By creating a common struct the code can be simplified when selecting
between the shared or multichannel DMA parameters.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
---
drivers/usb/musb/tusb6010_omap.c | 163 ++++++++++++++++++++-------------------
1 file changed, 84 insertions(+), 79 deletions(-)

diff --git a/drivers/usb/musb/tusb6010_omap.c b/drivers/usb/musb/tusb6010_omap.c
index 4e1a6e4a61b8..f1e58e15e5bb 100644
--- a/drivers/usb/musb/tusb6010_omap.c
+++ b/drivers/usb/musb/tusb6010_omap.c
@@ -31,6 +31,12 @@
#define OMAP242X_DMA_EXT_DMAREQ4 16
#define OMAP242X_DMA_EXT_DMAREQ5 64

+struct tusb_dma_data {
+ int ch;
+ s8 dmareq;
+ s8 sync_dev;
+};
+
struct tusb_omap_dma_ch {
struct musb *musb;
void __iomem *tbase;
@@ -39,9 +45,7 @@ struct tusb_omap_dma_ch {
u8 tx;
struct musb_hw_ep *hw_ep;

- int ch;
- s8 dmareq;
- s8 sync_dev;
+ struct tusb_dma_data dma_data;

struct tusb_omap_dma *tusb_dma;

@@ -58,9 +62,7 @@ struct tusb_omap_dma {
struct dma_controller controller;
void __iomem *tbase;

- int ch;
- s8 dmareq;
- s8 sync_dev;
+ struct tusb_dma_data dma_data;
unsigned multichannel:1;
};

@@ -119,9 +121,9 @@ static void tusb_omap_dma_cb(int lch, u16 ch_status, void *data)
spin_lock_irqsave(&musb->lock, flags);

if (tusb_dma->multichannel)
- ch = chdat->ch;
+ ch = chdat->dma_data.ch;
else
- ch = tusb_dma->ch;
+ ch = tusb_dma->dma_data.ch;

if (ch_status != OMAP_DMA_BLOCK_IRQ)
printk(KERN_ERR "TUSB DMA error status: %i\n", ch_status);
@@ -140,8 +142,7 @@ 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", chdat->ch,
- remaining);
+ chdat->tx ? "tx" : "rx", ch, remaining);
remaining = 0;
}

@@ -219,9 +220,7 @@ static int tusb_omap_dma_program(struct dma_channel *channel, u16 packet_sz,
u32 dma_remaining;
int src_burst, dst_burst;
u16 csr;
- int ch;
- s8 dmareq;
- s8 sync_dev;
+ struct tusb_dma_data *dma_data;

if (unlikely(dma_addr & 0x1) || (len < 32) || (len > packet_sz))
return false;
@@ -248,7 +247,7 @@ 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->ch,
+ chdat->tx ? "tx" : "rx", chdat->dma_data.ch,
dma_remaining);
return false;
}
@@ -261,15 +260,15 @@ static int tusb_omap_dma_program(struct dma_channel *channel, u16 packet_sz,
chdat->transfer_packet_sz = packet_sz;

if (tusb_dma->multichannel) {
- ch = chdat->ch;
- dmareq = chdat->dmareq;
- sync_dev = chdat->sync_dev;
+ dma_data = &chdat->dma_data;
} else {
+ dma_data = &tusb_dma->dma_data;
+
if (tusb_omap_use_shared_dmareq(chdat) != 0) {
dev_dbg(musb->controller, "could not get dma for ep%i\n", chdat->epnum);
return false;
}
- if (tusb_dma->ch < 0) {
+ if (dma_data->ch < 0) {
/* REVISIT: This should get blocked earlier, happens
* with MSC ErrorRecoveryTest
*/
@@ -277,10 +276,7 @@ static int tusb_omap_dma_program(struct dma_channel *channel, u16 packet_sz,
return false;
}

- ch = tusb_dma->ch;
- dmareq = tusb_dma->dmareq;
- sync_dev = tusb_dma->sync_dev;
- omap_set_dma_callback(ch, tusb_omap_dma_cb, channel);
+ omap_set_dma_callback(dma_data->ch, tusb_omap_dma_cb, channel);
}

chdat->packet_sz = packet_sz;
@@ -311,7 +307,7 @@ static int tusb_omap_dma_program(struct dma_channel *channel, u16 packet_sz,

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",
- ch, &dma_addr, chdat->transfer_len, len,
+ dma_data->ch, &dma_addr, chdat->transfer_len, len,
chdat->transfer_packet_sz, packet_sz);

/*
@@ -328,7 +324,7 @@ static int tusb_omap_dma_program(struct dma_channel *channel, u16 packet_sz,
dma_params.dst_ei = 1;
dma_params.dst_fi = -31; /* Loop 32 byte window */

- dma_params.trigger = sync_dev;
+ dma_params.trigger = dma_data->sync_dev;
dma_params.sync_mode = OMAP_DMA_SYNC_FRAME;
dma_params.src_or_dst_synch = 0; /* Dest sync */

@@ -345,7 +341,7 @@ static int tusb_omap_dma_program(struct dma_channel *channel, u16 packet_sz,
dma_params.dst_ei = 0;
dma_params.dst_fi = 0;

- dma_params.trigger = sync_dev;
+ dma_params.trigger = dma_data->sync_dev;
dma_params.sync_mode = OMAP_DMA_SYNC_FRAME;
dma_params.src_or_dst_synch = 1; /* Source sync */

@@ -359,10 +355,10 @@ static int tusb_omap_dma_program(struct dma_channel *channel, u16 packet_sz,
((dma_addr & 0x3) == 0) ? "sync" : "async",
dma_params.src_start, dma_params.dst_start);

- omap_set_dma_params(ch, &dma_params);
- omap_set_dma_src_burst_mode(ch, src_burst);
- omap_set_dma_dest_burst_mode(ch, dst_burst);
- omap_set_dma_write_mode(ch, OMAP_DMA_WRITE_LAST_NON_POSTED);
+ 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);

/*
* Prepare MUSB for DMA transfer
@@ -385,7 +381,7 @@ static int tusb_omap_dma_program(struct dma_channel *channel, u16 packet_sz,
/*
* Start DMA transfer
*/
- omap_start_dma(ch);
+ omap_start_dma(dma_data->ch);

if (chdat->tx) {
/* Send transfer_packet_sz packets at a time */
@@ -414,16 +410,17 @@ static int tusb_omap_dma_abort(struct dma_channel *channel)
{
struct tusb_omap_dma_ch *chdat = to_chdat(channel);
struct tusb_omap_dma *tusb_dma = chdat->tusb_dma;
+ struct tusb_dma_data *dma_data = &tusb_dma->dma_data;

if (!tusb_dma->multichannel) {
- if (tusb_dma->ch >= 0) {
- omap_stop_dma(tusb_dma->ch);
- omap_free_dma(tusb_dma->ch);
- tusb_dma->ch = -1;
+ if (dma_data->ch >= 0) {
+ omap_stop_dma(dma_data->ch);
+ omap_free_dma(dma_data->ch);
+ dma_data->ch = -1;
}

- tusb_dma->dmareq = -1;
- tusb_dma->sync_dev = -1;
+ dma_data->dmareq = -1;
+ dma_data->sync_dev = -1;
}

channel->status = MUSB_DMA_STATUS_FREE;
@@ -461,8 +458,8 @@ static inline int tusb_omap_dma_allocate_dmareq(struct tusb_omap_dma_ch *chdat)
reg |= ((1 << 4) << (dmareq_nr * 5));
musb_writel(chdat->tbase, TUSB_DMA_EP_MAP, reg);

- chdat->dmareq = dmareq_nr;
- chdat->sync_dev = sync_dev[chdat->dmareq];
+ chdat->dma_data.dmareq = dmareq_nr;
+ chdat->dma_data.sync_dev = sync_dev[chdat->dma_data.dmareq];

return 0;
}
@@ -471,15 +468,15 @@ static inline void tusb_omap_dma_free_dmareq(struct tusb_omap_dma_ch *chdat)
{
u32 reg;

- if (!chdat || chdat->dmareq < 0)
+ if (!chdat || chdat->dma_data.dmareq < 0)
return;

reg = musb_readl(chdat->tbase, TUSB_DMA_EP_MAP);
- reg &= ~(0x1f << (chdat->dmareq * 5));
+ reg &= ~(0x1f << (chdat->dma_data.dmareq * 5));
musb_writel(chdat->tbase, TUSB_DMA_EP_MAP, reg);

- chdat->dmareq = -1;
- chdat->sync_dev = -1;
+ chdat->dma_data.dmareq = -1;
+ chdat->dma_data.sync_dev = -1;
}

static struct dma_channel *dma_channel_pool[MAX_DMAREQ];
@@ -491,11 +488,13 @@ tusb_omap_dma_allocate(struct dma_controller *c,
{
int ret, i;
const char *dev_name;
+ void *cb_data;
struct tusb_omap_dma *tusb_dma;
struct musb *musb;
void __iomem *tbase;
struct dma_channel *channel = NULL;
struct tusb_omap_dma_ch *chdat = NULL;
+ struct tusb_dma_data *dma_data = NULL;
u32 reg;

tusb_dma = container_of(c, struct tusb_omap_dma, controller);
@@ -528,56 +527,61 @@ tusb_omap_dma_allocate(struct dma_controller *c,
if (!channel)
return NULL;

- if (tx) {
- chdat->tx = 1;
- dev_name = "TUSB transmit";
- } else {
- chdat->tx = 0;
- dev_name = "TUSB receive";
- }
-
chdat->musb = tusb_dma->controller.musb;
chdat->tbase = tusb_dma->tbase;
chdat->hw_ep = hw_ep;
chdat->epnum = hw_ep->epnum;
- chdat->dmareq = -1;
chdat->completed_len = 0;
chdat->tusb_dma = tusb_dma;
+ if (tx)
+ chdat->tx = 1;
+ else
+ chdat->tx = 0;

channel->max_len = 0x7fffffff;
channel->desired_mode = 0;
channel->actual_len = 0;

if (tusb_dma->multichannel) {
+ dma_data = &chdat->dma_data;
ret = tusb_omap_dma_allocate_dmareq(chdat);
if (ret != 0)
goto free_dmareq;

- ret = omap_request_dma(chdat->sync_dev, dev_name,
- tusb_omap_dma_cb, channel, &chdat->ch);
- if (ret != 0)
- goto free_dmareq;
- } else if (tusb_dma->ch == -1) {
- tusb_dma->dmareq = 0;
- tusb_dma->sync_dev = OMAP24XX_DMA_EXT_DMAREQ0;
-
+ if (chdat->tx)
+ dev_name = "TUSB transmit";
+ else
+ dev_name = "TUSB receive";
+ cb_data = channel;
+ } else if (tusb_dma->dma_data.ch == -1) {
+ dma_data = &tusb_dma->dma_data;
+ dma_data->dmareq = 0;
+ dma_data->sync_dev = OMAP24XX_DMA_EXT_DMAREQ0;
+
+ dev_name = "TUSB shared";
/* Callback data gets set later in the shared dmareq case */
- ret = omap_request_dma(tusb_dma->sync_dev, "TUSB shared",
- tusb_omap_dma_cb, NULL, &tusb_dma->ch);
+ cb_data = NULL;
+
+ chdat->dma_data.dmareq = -1;
+ chdat->dma_data.ch = -1;
+ chdat->dma_data.sync_dev = -1;
+ }
+
+ if (dma_data) {
+ ret = omap_request_dma(dma_data->sync_dev, dev_name,
+ tusb_omap_dma_cb, cb_data, &dma_data->ch);
if (ret != 0)
goto free_dmareq;
-
- chdat->dmareq = -1;
- chdat->ch = -1;
+ } else {
+ /* Already allocated shared, single DMA channel. */
+ dma_data = &tusb_dma->dma_data;
}

dev_dbg(musb->controller, "ep%i %s dma: %s dma%i dmareq%i sync%i\n",
chdat->epnum,
chdat->tx ? "tx" : "rx",
- chdat->ch >= 0 ? "dedicated" : "shared",
- chdat->ch >= 0 ? chdat->ch : tusb_dma->ch,
- chdat->dmareq >= 0 ? chdat->dmareq : tusb_dma->dmareq,
- chdat->sync_dev >= 0 ? chdat->sync_dev : tusb_dma->sync_dev);
+ chdat->dma_data.ch >= 0 ? "dedicated" : "shared",
+ dma_data->ch, dma_data->dmareq, dma_data->sync_dev);

return channel;

@@ -597,7 +601,8 @@ static void tusb_omap_dma_release(struct dma_channel *channel)
void __iomem *tbase = musb->ctrl_base;
u32 reg;

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

reg = musb_readl(tbase, TUSB_DMA_INT_MASK);
if (chdat->tx)
@@ -615,13 +620,13 @@ static void tusb_omap_dma_release(struct dma_channel *channel)

channel->status = MUSB_DMA_STATUS_UNKNOWN;

- if (chdat->ch >= 0) {
- omap_stop_dma(chdat->ch);
- omap_free_dma(chdat->ch);
- chdat->ch = -1;
+ if (chdat->dma_data.ch >= 0) {
+ omap_stop_dma(chdat->dma_data.ch);
+ omap_free_dma(chdat->dma_data.ch);
+ chdat->dma_data.ch = -1;
}

- if (chdat->dmareq >= 0)
+ if (chdat->dma_data.dmareq >= 0)
tusb_omap_dma_free_dmareq(chdat);

channel = NULL;
@@ -641,8 +646,8 @@ void tusb_dma_controller_destroy(struct dma_controller *c)
}
}

- if (tusb_dma && !tusb_dma->multichannel && tusb_dma->ch >= 0)
- omap_free_dma(tusb_dma->ch);
+ if (tusb_dma && !tusb_dma->multichannel && tusb_dma->dma_data.ch >= 0)
+ omap_free_dma(tusb_dma->dma_data.ch);

kfree(tusb_dma);
}
@@ -672,9 +677,9 @@ tusb_dma_controller_create(struct musb *musb, void __iomem *base)
tusb_dma->controller.musb = musb;
tusb_dma->tbase = musb->ctrl_base;

- tusb_dma->ch = -1;
- tusb_dma->dmareq = -1;
- tusb_dma->sync_dev = -1;
+ tusb_dma->dma_data.ch = -1;
+ tusb_dma->dma_data.dmareq = -1;
+ tusb_dma->dma_data.sync_dev = -1;

tusb_dma->controller.channel_alloc = tusb_omap_dma_allocate;
tusb_dma->controller.channel_release = tusb_omap_dma_release;
--
2.12.2