diff options
author | Russell King <rmk+kernel@arm.linux.org.uk> | 2012-04-21 21:41:10 (GMT) |
---|---|---|
committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2012-07-31 11:06:23 (GMT) |
commit | 4e078fbd581a92fa26ba2def4ac8f2a633cdcb5b (patch) | |
tree | 6dae1ad3a0ffa44b762d2723ce8ee00e035c01ca /drivers | |
parent | 3451c06754b5777d227aa99f85c35bdfabac3ca0 (diff) | |
download | linux-4e078fbd581a92fa26ba2def4ac8f2a633cdcb5b.tar.xz |
mmc: omap: remove private DMA API implementation
Remove the private DMA API implementation from omap, making it use
entirely the DMA engine API.
Tested-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'drivers')
-rw-r--r-- | drivers/mmc/host/omap.c | 235 |
1 files changed, 6 insertions, 229 deletions
diff --git a/drivers/mmc/host/omap.c b/drivers/mmc/host/omap.c index 25e7efe..50e08f0 100644 --- a/drivers/mmc/host/omap.c +++ b/drivers/mmc/host/omap.c @@ -101,8 +101,6 @@ struct mmc_omap_host; -#define USE_DMA_PRIVATE - struct mmc_omap_slot { int id; unsigned int vdd; @@ -162,12 +160,6 @@ struct mmc_omap_host { unsigned use_dma:1; unsigned brs_received:1, dma_done:1; unsigned dma_in_use:1; -#ifdef USE_DMA_PRIVATE - unsigned dma_is_read:1; - int dma_ch; - struct timer_list dma_timer; - unsigned dma_len; -#endif spinlock_t dma_lock; struct mmc_omap_slot *slots[OMAP_MMC_MAX_SLOTS]; @@ -419,13 +411,6 @@ mmc_omap_release_dma(struct mmc_omap_host *host, struct mmc_data *data, struct device *dev = mmc_dev(host->mmc); struct dma_chan *c; -#ifdef USE_DMA_PRIVATE - BUG_ON(host->dma_ch < 0); - if (data->error) - omap_stop_dma(host->dma_ch); - /* Release DMA channel lazily */ - mod_timer(&host->dma_timer, jiffies + HZ); -#endif if (data->flags & MMC_DATA_WRITE) { dma_data_dir = DMA_TO_DEVICE; c = host->dma_tx; @@ -548,18 +533,6 @@ mmc_omap_end_of_data(struct mmc_omap_host *host, struct mmc_data *data) mmc_omap_xfer_done(host, data); } -#ifdef USE_DMA_PRIVATE -static void -mmc_omap_dma_timer(unsigned long data) -{ - struct mmc_omap_host *host = (struct mmc_omap_host *) data; - - BUG_ON(host->dma_ch < 0); - omap_free_dma(host->dma_ch); - host->dma_ch = -1; -} -#endif - static void mmc_omap_dma_done(struct mmc_omap_host *host, struct mmc_data *data) { @@ -928,163 +901,6 @@ static void mmc_omap_dma_callback(void *priv) mmc_omap_dma_done(host, data); } -#ifdef USE_DMA_PRIVATE -/* Prepare to transfer the next segment of a scatterlist */ -static void -mmc_omap_prepare_dma(struct mmc_omap_host *host, struct mmc_data *data) -{ - int dma_ch = host->dma_ch; - unsigned long data_addr; - u16 buf, frame; - u32 count; - struct scatterlist *sg = &data->sg[host->sg_idx]; - int src_port = 0; - int dst_port = 0; - int sync_dev = 0; - - data_addr = host->phys_base + OMAP_MMC_REG(host, DATA); - frame = data->blksz; - count = sg_dma_len(sg); - - if ((data->blocks == 1) && (count > data->blksz)) - count = frame; - - host->dma_len = count; - - /* FIFO is 16x2 bytes on 15xx, and 32x2 bytes on 16xx and 24xx. - * Use 16 or 32 word frames when the blocksize is at least that large. - * Blocksize is usually 512 bytes; but not for some SD reads. - */ - if (cpu_is_omap15xx() && frame > 32) - frame = 32; - else if (frame > 64) - frame = 64; - count /= frame; - frame >>= 1; - - if (!(data->flags & MMC_DATA_WRITE)) { - buf = 0x800f | ((frame - 1) << 8); - - if (cpu_class_is_omap1()) { - src_port = OMAP_DMA_PORT_TIPB; - dst_port = OMAP_DMA_PORT_EMIFF; - } - if (cpu_is_omap24xx()) - sync_dev = OMAP24XX_DMA_MMC1_RX; - - omap_set_dma_src_params(dma_ch, src_port, - OMAP_DMA_AMODE_CONSTANT, - data_addr, 0, 0); - omap_set_dma_dest_params(dma_ch, dst_port, - OMAP_DMA_AMODE_POST_INC, - sg_dma_address(sg), 0, 0); - omap_set_dma_dest_data_pack(dma_ch, 1); - omap_set_dma_dest_burst_mode(dma_ch, OMAP_DMA_DATA_BURST_4); - } else { - buf = 0x0f80 | ((frame - 1) << 0); - - if (cpu_class_is_omap1()) { - src_port = OMAP_DMA_PORT_EMIFF; - dst_port = OMAP_DMA_PORT_TIPB; - } - if (cpu_is_omap24xx()) - sync_dev = OMAP24XX_DMA_MMC1_TX; - - omap_set_dma_dest_params(dma_ch, dst_port, - OMAP_DMA_AMODE_CONSTANT, - data_addr, 0, 0); - omap_set_dma_src_params(dma_ch, src_port, - OMAP_DMA_AMODE_POST_INC, - sg_dma_address(sg), 0, 0); - omap_set_dma_src_data_pack(dma_ch, 1); - omap_set_dma_src_burst_mode(dma_ch, OMAP_DMA_DATA_BURST_4); - } - - /* Max limit for DMA frame count is 0xffff */ - BUG_ON(count > 0xffff); - - OMAP_MMC_WRITE(host, BUF, buf); - omap_set_dma_transfer_params(dma_ch, OMAP_DMA_DATA_TYPE_S16, - frame, count, OMAP_DMA_SYNC_FRAME, - sync_dev, 0); -} - -/* A scatterlist segment completed */ -static void mmc_omap_dma_cb(int lch, u16 ch_status, void *data) -{ - struct mmc_omap_host *host = (struct mmc_omap_host *) data; - struct mmc_data *mmcdat = host->data; - - if (unlikely(host->dma_ch < 0)) { - dev_err(mmc_dev(host->mmc), - "DMA callback while DMA not enabled\n"); - return; - } - /* FIXME: We really should do something to _handle_ the errors */ - if (ch_status & OMAP1_DMA_TOUT_IRQ) { - dev_err(mmc_dev(host->mmc),"DMA timeout\n"); - return; - } - if (ch_status & OMAP_DMA_DROP_IRQ) { - dev_err(mmc_dev(host->mmc), "DMA sync error\n"); - return; - } - if (!(ch_status & OMAP_DMA_BLOCK_IRQ)) { - return; - } - mmcdat->bytes_xfered += host->dma_len; - host->sg_idx++; - if (host->sg_idx < host->sg_len) { - mmc_omap_prepare_dma(host, host->data); - omap_start_dma(host->dma_ch); - } else - mmc_omap_dma_done(host, host->data); -} - -static int mmc_omap_get_dma_channel(struct mmc_omap_host *host, struct mmc_data *data) -{ - const char *dma_dev_name; - int sync_dev, dma_ch, is_read, r; - - is_read = !(data->flags & MMC_DATA_WRITE); - del_timer_sync(&host->dma_timer); - if (host->dma_ch >= 0) { - if (is_read == host->dma_is_read) - return 0; - omap_free_dma(host->dma_ch); - host->dma_ch = -1; - } - - if (is_read) { - if (host->id == 0) { - sync_dev = OMAP_DMA_MMC_RX; - dma_dev_name = "MMC1 read"; - } else { - sync_dev = OMAP_DMA_MMC2_RX; - dma_dev_name = "MMC2 read"; - } - } else { - if (host->id == 0) { - sync_dev = OMAP_DMA_MMC_TX; - dma_dev_name = "MMC1 write"; - } else { - sync_dev = OMAP_DMA_MMC2_TX; - dma_dev_name = "MMC2 write"; - } - } - r = omap_request_dma(sync_dev, dma_dev_name, mmc_omap_dma_cb, - host, &dma_ch); - if (r != 0) { - dev_dbg(mmc_dev(host->mmc), "omap_request_dma() failed with %d\n", r); - return r; - } - host->dma_ch = dma_ch; - host->dma_is_read = is_read; - - return 0; -} -#endif - static inline void set_cmd_timeout(struct mmc_omap_host *host, struct mmc_request *req) { u16 reg; @@ -1229,38 +1045,13 @@ mmc_omap_prepare_data(struct mmc_omap_host *host, struct mmc_request *req) return; } use_pio: -#ifdef USE_DMA_PRIVATE - if (use_dma) { - if (mmc_omap_get_dma_channel(host, data) == 0) { - enum dma_data_direction dma_data_dir; - - if (data->flags & MMC_DATA_WRITE) - dma_data_dir = DMA_TO_DEVICE; - else - dma_data_dir = DMA_FROM_DEVICE; - - host->sg_len = dma_map_sg(mmc_dev(host->mmc), data->sg, - sg_len, dma_data_dir); - host->total_bytes_left = 0; - mmc_omap_prepare_dma(host, req->data); - host->brs_received = 0; - host->dma_done = 0; - host->dma_in_use = 1; - } else - use_dma = 0; - } -#else - use_dma = 0; -#endif /* Revert to PIO? */ - if (!use_dma) { - OMAP_MMC_WRITE(host, BUF, 0x1f1f); - host->total_bytes_left = data->blocks * block_size; - host->sg_len = sg_len; - mmc_omap_sg_to_buf(host); - host->dma_in_use = 0; - } + OMAP_MMC_WRITE(host, BUF, 0x1f1f); + host->total_bytes_left = data->blocks * block_size; + host->sg_len = sg_len; + mmc_omap_sg_to_buf(host); + host->dma_in_use = 0; } static void mmc_omap_start_request(struct mmc_omap_host *host, @@ -1277,12 +1068,7 @@ static void mmc_omap_start_request(struct mmc_omap_host *host, struct dma_chan *c = host->data->flags & MMC_DATA_WRITE ? host->dma_tx : host->dma_rx; - if (c) - dma_async_issue_pending(c); -#ifdef USE_DMA_PRIVATE - else - omap_start_dma(host->dma_ch); -#endif + dma_async_issue_pending(c); } } @@ -1566,9 +1352,6 @@ static int __devinit mmc_omap_probe(struct platform_device *pdev) setup_timer(&host->clk_timer, mmc_omap_clk_timer, (unsigned long) host); spin_lock_init(&host->dma_lock); -#ifdef USE_DMA_PRIVATE - setup_timer(&host->dma_timer, mmc_omap_dma_timer, (unsigned long) host); -#endif spin_lock_init(&host->slot_lock); init_waitqueue_head(&host->slot_wq); @@ -1579,13 +1362,7 @@ static int __devinit mmc_omap_probe(struct platform_device *pdev) host->id = pdev->id; host->mem_res = res; host->irq = irq; - host->use_dma = 1; -#ifdef USE_DMA_PRIVATE - host->dev->dma_mask = &pdata->dma_mask; - host->dma_ch = -1; -#endif - host->irq = irq; host->phys_base = host->mem_res->start; host->virt_base = ioremap(res->start, resource_size(res)); |