diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/mmc/host/omap_hsmmc.c | 192 |
1 files changed, 165 insertions, 27 deletions
diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c index 389a3eedfc24..effe328c1c14 100644 --- a/drivers/mmc/host/omap_hsmmc.c +++ b/drivers/mmc/host/omap_hsmmc.c @@ -19,6 +19,7 @@ #include <linux/init.h> #include <linux/kernel.h> #include <linux/debugfs.h> +#include <linux/dmaengine.h> #include <linux/seq_file.h> #include <linux/interrupt.h> #include <linux/delay.h> @@ -165,7 +166,9 @@ struct omap_hsmmc_host { u32 bytesleft; int suspended; int irq; - int use_dma, dma_ch; + int use_dma, dma_ch, dma2; + struct dma_chan *tx_chan; + struct dma_chan *rx_chan; int dma_line_tx, dma_line_rx; int slot_id; int response_busy; @@ -797,19 +800,26 @@ omap_hsmmc_get_dma_dir(struct omap_hsmmc_host *host, struct mmc_data *data) return DMA_FROM_DEVICE; } +static struct dma_chan *omap_hsmmc_get_dma_chan(struct omap_hsmmc_host *host, + struct mmc_data *data) +{ + return data->flags & MMC_DATA_WRITE ? host->tx_chan : host->rx_chan; +} + static void omap_hsmmc_request_done(struct omap_hsmmc_host *host, struct mmc_request *mrq) { - int dma_ch; + int dma_ch, dma2; unsigned long flags; spin_lock_irqsave(&host->irq_lock, flags); host->req_in_progress = 0; dma_ch = host->dma_ch; + dma2 = host->dma2; spin_unlock_irqrestore(&host->irq_lock, flags); omap_hsmmc_disable_irq(host); /* Do not complete the request if DMA is still in progress */ - if (mrq->data && host->use_dma && dma_ch != -1) + if (mrq->data && host->use_dma && (dma_ch != -1 || dma2 != -1)) return; host->mrq = NULL; mmc_request_done(host->mmc, mrq); @@ -878,7 +888,7 @@ omap_hsmmc_cmd_done(struct omap_hsmmc_host *host, struct mmc_command *cmd) */ static void omap_hsmmc_dma_cleanup(struct omap_hsmmc_host *host, int errno) { - int dma_ch; + int dma_ch, dma2; unsigned long flags; host->data->error = errno; @@ -886,8 +896,20 @@ static void omap_hsmmc_dma_cleanup(struct omap_hsmmc_host *host, int errno) spin_lock_irqsave(&host->irq_lock, flags); dma_ch = host->dma_ch; host->dma_ch = -1; + dma2 = host->dma2; + host->dma2 = -1; spin_unlock_irqrestore(&host->irq_lock, flags); + if (host->use_dma && dma2 != -1) { + struct dma_chan *chan = omap_hsmmc_get_dma_chan(host, host->data); + + dmaengine_terminate_all(chan); + dma_unmap_sg(chan->device->dev, + host->data->sg, host->data->sg_len, + omap_hsmmc_get_dma_dir(host, host->data)); + + host->data->host_cookie = 0; + } if (host->use_dma && dma_ch != -1) { dma_unmap_sg(mmc_dev(host->mmc), host->data->sg, host->data->sg_len, @@ -1284,9 +1306,43 @@ static void omap_hsmmc_dma_cb(int lch, u16 ch_status, void *cb_data) } } +static void omap_hsmmc_dma_callback(void *param) +{ + struct omap_hsmmc_host *host = param; + struct dma_chan *chan; + struct mmc_data *data; + int req_in_progress; + + spin_lock_irq(&host->irq_lock); + if (host->dma2 < 0) { + spin_unlock_irq(&host->irq_lock); + return; + } + + data = host->mrq->data; + chan = omap_hsmmc_get_dma_chan(host, data); + if (!data->host_cookie) + dma_unmap_sg(chan->device->dev, + data->sg, data->sg_len, + omap_hsmmc_get_dma_dir(host, data)); + + req_in_progress = host->req_in_progress; + host->dma2 = -1; + spin_unlock_irq(&host->irq_lock); + + /* If DMA has finished after TC, complete the request */ + if (!req_in_progress) { + struct mmc_request *mrq = host->mrq; + + host->mrq = NULL; + mmc_request_done(host->mmc, mrq); + } +} + static int omap_hsmmc_pre_dma_transfer(struct omap_hsmmc_host *host, struct mmc_data *data, - struct omap_hsmmc_next *next) + struct omap_hsmmc_next *next, + struct device *dev) { int dma_len; @@ -1301,8 +1357,7 @@ static int omap_hsmmc_pre_dma_transfer(struct omap_hsmmc_host *host, /* Check if next job is already prepared */ if (next || (!next && data->host_cookie != host->next_data.cookie)) { - dma_len = dma_map_sg(mmc_dev(host->mmc), data->sg, - data->sg_len, + dma_len = dma_map_sg(dev, data->sg, data->sg_len, omap_hsmmc_get_dma_dir(host, data)); } else { @@ -1331,6 +1386,7 @@ static int omap_hsmmc_start_dma_transfer(struct omap_hsmmc_host *host, { int dma_ch = 0, ret = 0, i; struct mmc_data *data = req->data; + struct dma_chan *chan; /* Sanity check: all the SG entries must be aligned by block size. */ for (i = 0; i < data->sg_len; i++) { @@ -1346,24 +1402,66 @@ static int omap_hsmmc_start_dma_transfer(struct omap_hsmmc_host *host, */ return -EINVAL; - BUG_ON(host->dma_ch != -1); + BUG_ON(host->dma_ch != -1 || host->dma2 != -1); - ret = omap_request_dma(omap_hsmmc_get_dma_sync_dev(host, data), - "MMC/SD", omap_hsmmc_dma_cb, host, &dma_ch); - if (ret != 0) { - dev_err(mmc_dev(host->mmc), - "%s: omap_request_dma() failed with %d\n", - mmc_hostname(host->mmc), ret); - return ret; - } - ret = omap_hsmmc_pre_dma_transfer(host, data, NULL); - if (ret) - return ret; + chan = omap_hsmmc_get_dma_chan(host, data); + if (!chan) { + ret = omap_request_dma(omap_hsmmc_get_dma_sync_dev(host, data), + "MMC/SD", omap_hsmmc_dma_cb, host, &dma_ch); + if (ret != 0) { + dev_err(mmc_dev(host->mmc), + "%s: omap_request_dma() failed with %d\n", + mmc_hostname(host->mmc), ret); + return ret; + } + ret = omap_hsmmc_pre_dma_transfer(host, data, NULL, + mmc_dev(host->mmc)); + if (ret) + return ret; + + host->dma_ch = dma_ch; + host->dma_sg_idx = 0; + + omap_hsmmc_config_dma_params(host, data, data->sg); + } else { + struct dma_slave_config cfg; + struct dma_async_tx_descriptor *tx; + + cfg.src_addr = host->mapbase + OMAP_HSMMC_DATA; + cfg.dst_addr = host->mapbase + OMAP_HSMMC_DATA; + cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; + cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; + cfg.src_maxburst = data->blksz / 4; + cfg.dst_maxburst = data->blksz / 4; + + ret = dmaengine_slave_config(chan, &cfg); + if (ret) + return ret; + + ret = omap_hsmmc_pre_dma_transfer(host, data, NULL, + chan->device->dev); + if (ret) + return ret; + + tx = dmaengine_prep_slave_sg(chan, data->sg, data->sg_len, + data->flags & MMC_DATA_WRITE ? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM, + DMA_PREP_INTERRUPT | DMA_CTRL_ACK); + if (!tx) { + dev_err(mmc_dev(host->mmc), "prep_slave_sg() failed\n"); + /* FIXME: cleanup */ + return -1; + } - host->dma_ch = dma_ch; - host->dma_sg_idx = 0; + tx->callback = omap_hsmmc_dma_callback; + tx->callback_param = host; - omap_hsmmc_config_dma_params(host, data, data->sg); + /* Does not fail */ + dmaengine_submit(tx); + + host->dma2 = 1; + + dma_async_issue_pending(chan); + } return 0; } @@ -1446,9 +1544,12 @@ static void omap_hsmmc_post_req(struct mmc_host *mmc, struct mmc_request *mrq, struct mmc_data *data = mrq->data; if (host->use_dma) { + struct dma_chan *c = omap_hsmmc_get_dma_chan(host, data); + struct device *dev = c ? c->device->dev : mmc_dev(mmc); + if (data->host_cookie) - dma_unmap_sg(mmc_dev(host->mmc), data->sg, - data->sg_len, + dma_unmap_sg(dev, + data->sg, data->sg_len, omap_hsmmc_get_dma_dir(host, data)); data->host_cookie = 0; } @@ -1464,10 +1565,14 @@ static void omap_hsmmc_pre_req(struct mmc_host *mmc, struct mmc_request *mrq, return ; } - if (host->use_dma) + if (host->use_dma) { + struct dma_chan *c = omap_hsmmc_get_dma_chan(host, mrq->data); + struct device *dev = c ? c->device->dev : mmc_dev(mmc); + if (omap_hsmmc_pre_dma_transfer(host, mrq->data, - &host->next_data)) + &host->next_data, dev)) mrq->data->host_cookie = 0; + } } /* @@ -1479,7 +1584,7 @@ static void omap_hsmmc_request(struct mmc_host *mmc, struct mmc_request *req) int err; BUG_ON(host->req_in_progress); - BUG_ON(host->dma_ch != -1); + BUG_ON(host->dma_ch != -1 || host->dma2 != -1); if (host->protect_card) { if (host->reqs_blocked < 3) { /* @@ -1846,6 +1951,7 @@ static int __devinit omap_hsmmc_probe(struct platform_device *pdev) host->use_dma = 1; host->dev->dma_mask = &pdata->dma_mask; host->dma_ch = -1; + host->dma2 = -1; host->irq = irq; host->slot_id = 0; host->mapbase = res->start + pdata->reg_offset; @@ -1942,6 +2048,29 @@ static int __devinit omap_hsmmc_probe(struct platform_device *pdev) } host->dma_line_rx = res->start; + { + dma_cap_mask_t mask; + unsigned sig; + extern bool omap_dma_filter_fn(struct dma_chan *chan, void *param); + + dma_cap_zero(mask); + dma_cap_set(DMA_SLAVE, mask); +#if 1 + sig = host->dma_line_rx; + host->rx_chan = dma_request_channel(mask, omap_dma_filter_fn, &sig); + if (!host->rx_chan) { + dev_warn(mmc_dev(host->mmc), "unable to obtain RX DMA engine channel %u\n", sig); + } +#endif +#if 1 + sig = host->dma_line_tx; + host->tx_chan = dma_request_channel(mask, omap_dma_filter_fn, &sig); + if (!host->tx_chan) { + dev_warn(mmc_dev(host->mmc), "unable to obtain TX DMA engine channel %u\n", sig); + } +#endif + } + /* Request IRQ for MMC operations */ ret = request_irq(host->irq, omap_hsmmc_irq, 0, mmc_hostname(mmc), host); @@ -2019,6 +2148,10 @@ err_reg: err_irq_cd_init: free_irq(host->irq, host); err_irq: + if (host->tx_chan) + dma_release_channel(host->tx_chan); + if (host->rx_chan) + dma_release_channel(host->rx_chan); pm_runtime_put_sync(host->dev); pm_runtime_disable(host->dev); clk_put(host->fclk); @@ -2054,6 +2187,11 @@ static int __devexit omap_hsmmc_remove(struct platform_device *pdev) if (mmc_slot(host).card_detect_irq) free_irq(mmc_slot(host).card_detect_irq, host); + if (host->tx_chan) + dma_release_channel(host->tx_chan); + if (host->rx_chan) + dma_release_channel(host->rx_chan); + pm_runtime_put_sync(host->dev); pm_runtime_disable(host->dev); clk_put(host->fclk); |