Re: [PATCH v3 5/9] usb: musb: tusb6010_omap: Create new struct for DMA data/parameters

From: Bin Liu
Date: Wed May 17 2017 - 16:17:38 EST

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On Fri, May 12, 2017 at 04:57:48PM +0300, Peter Ujfalusi wrote:
> 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@xxxxxx>
> Tested-by: Tony Lindgren <tony@xxxxxxxxxxx>
> ---
> 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 025b52e0b34d..938ded0c407b 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;
> }
>
> @@ -220,9 +221,7 @@ static int tusb_omap_dma_program(struct dma_channel *channel, u16 packet_sz,
> int src_burst, dst_burst;
> u16 csr;
> u32 psize;
> - 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;
> @@ -249,7 +248,7 @@ 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;
> }
> @@ -262,15 +261,15 @@ 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
> */
> @@ -278,10 +277,7 @@ 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;
> @@ -312,7 +308,7 @@ 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);
>
> /*
> @@ -329,7 +325,7 @@ 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 */
>
> @@ -346,7 +342,7 @@ 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 */
>
> @@ -360,10 +356,10 @@ 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
> @@ -386,7 +382,7 @@ 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 */
> @@ -415,16 +411,17 @@ 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;
> @@ -462,8 +459,8 @@ 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;
> }
> @@ -472,15 +469,15 @@ 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];
> @@ -492,11 +489,13 @@ 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);
> @@ -529,56 +528,61 @@ 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);

line over 80 characters.

Regards,
-Bin.

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