1 files changed, 303 insertions, 45 deletions

diff --git a/drivers/mmc/host/mmci.c b/drivers/mmc/host/mmci.c
index 2d6de3e03e2d..5bbb87d10251 100644
--- a/drivers/mmc/host/mmci.c
+++ b/drivers/mmc/host/mmci.c
@@ -2,7 +2,7 @@
  *  linux/drivers/mmc/host/mmci.c - ARM PrimeCell MMCI PL180/1 driver
  *
  *  Copyright (C) 2003 Deep Blue Solutions, Ltd, All Rights Reserved.
- *  Copyright (C) 2010 ST-Ericsson AB.
+ *  Copyright (C) 2010 ST-Ericsson SA
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
@@ -25,8 +25,10 @@
 #include <linux/clk.h>
 #include <linux/scatterlist.h>
 #include <linux/gpio.h>
-#include <linux/amba/mmci.h>
 #include <linux/regulator/consumer.h>
+#include <linux/dmaengine.h>
+#include <linux/dma-mapping.h>
+#include <linux/amba/mmci.h>
 
 #include <asm/div64.h>
 #include <asm/io.h>
@@ -142,9 +144,6 @@ mmci_request_end(struct mmci_host *host, struct mmc_request *mrq)
         host->mrq = NULL;
         host->cmd = NULL;
 
-        if (mrq->data)
-                mrq->data->bytes_xfered = host->data_xfered;
-
         /*
          * Need to drop the host lock here; mmc_request_done may call
          * back into the driver...
@@ -189,6 +188,248 @@ static void mmci_init_sg(struct mmci_host *host, struct mmc_data *data)
         sg_miter_start(&host->sg_miter, data->sg, data->sg_len, flags);
 }
 
+/*
+ * All the DMA operation mode stuff goes inside this ifdef.
+ * This assumes that you have a generic DMA device interface,
+ * no custom DMA interfaces are supported.
+ */
+#ifdef CONFIG_DMA_ENGINE
+static void __devinit mmci_dma_setup(struct mmci_host *host)
+{
+        struct mmci_platform_data *plat = host->plat;
+        const char *rxname, *txname;
+        dma_cap_mask_t mask;
+
+        if (!plat || !plat->dma_filter) {
+                dev_info(mmc_dev(host->mmc), "no DMA platform data\n");
+                return;
+        }
+
+        /* Try to acquire a generic DMA engine slave channel */
+        dma_cap_zero(mask);
+        dma_cap_set(DMA_SLAVE, mask);
+
+        /*
+         * If only an RX channel is specified, the driver will
+         * attempt to use it bidirectionally, however if it is
+         * is specified but cannot be located, DMA will be disabled.
+         */
+        if (plat->dma_rx_param) {
+                host->dma_rx_channel = dma_request_channel(mask,
+                                                           plat->dma_filter,
+                                                           plat->dma_rx_param);
+                /* E.g if no DMA hardware is present */
+                if (!host->dma_rx_channel)
+                        dev_err(mmc_dev(host->mmc), "no RX DMA channel\n");
+        }
+
+        if (plat->dma_tx_param) {
+                host->dma_tx_channel = dma_request_channel(mask,
+                                                           plat->dma_filter,
+                                                           plat->dma_tx_param);
+                if (!host->dma_tx_channel)
+                        dev_warn(mmc_dev(host->mmc), "no TX DMA channel\n");
+        } else {
+                host->dma_tx_channel = host->dma_rx_channel;
+        }
+
+        if (host->dma_rx_channel)
+                rxname = dma_chan_name(host->dma_rx_channel);
+        else
+                rxname = "none";
+
+        if (host->dma_tx_channel)
+                txname = dma_chan_name(host->dma_tx_channel);
+        else
+                txname = "none";
+
+        dev_info(mmc_dev(host->mmc), "DMA channels RX %s, TX %s\n",
+                 rxname, txname);
+
+        /*
+         * Limit the maximum segment size in any SG entry according to
+         * the parameters of the DMA engine device.
+         */
+        if (host->dma_tx_channel) {
+                struct device *dev = host->dma_tx_channel->device->dev;
+                unsigned int max_seg_size = dma_get_max_seg_size(dev);
+
+                if (max_seg_size < host->mmc->max_seg_size)
+                        host->mmc->max_seg_size = max_seg_size;
+        }
+        if (host->dma_rx_channel) {
+                struct device *dev = host->dma_rx_channel->device->dev;
+                unsigned int max_seg_size = dma_get_max_seg_size(dev);
+
+                if (max_seg_size < host->mmc->max_seg_size)
+                        host->mmc->max_seg_size = max_seg_size;
+        }
+}
+
+/*
+ * This is used in __devinit or __devexit so inline it
+ * so it can be discarded.
+ */
+static inline void mmci_dma_release(struct mmci_host *host)
+{
+        struct mmci_platform_data *plat = host->plat;
+
+        if (host->dma_rx_channel)
+                dma_release_channel(host->dma_rx_channel);
+        if (host->dma_tx_channel && plat->dma_tx_param)
+                dma_release_channel(host->dma_tx_channel);
+        host->dma_rx_channel = host->dma_tx_channel = NULL;
+}
+
+static void mmci_dma_unmap(struct mmci_host *host, struct mmc_data *data)
+{
+        struct dma_chan *chan = host->dma_current;
+        enum dma_data_direction dir;
+        u32 status;
+        int i;
+
+        /* Wait up to 1ms for the DMA to complete */
+        for (i = 0; ; i++) {
+                status = readl(host->base + MMCISTATUS);
+                if (!(status & MCI_RXDATAAVLBLMASK) || i >= 100)
+                        break;
+                udelay(10);
+        }
+
+        /*
+         * Check to see whether we still have some data left in the FIFO -
+         * this catches DMA controllers which are unable to monitor the
+         * DMALBREQ and DMALSREQ signals while allowing us to DMA to non-
+         * contiguous buffers.  On TX, we'll get a FIFO underrun error.
+         */
+        if (status & MCI_RXDATAAVLBLMASK) {
+                dmaengine_terminate_all(chan);
+                if (!data->error)
+                        data->error = -EIO;
+        }
+
+        if (data->flags & MMC_DATA_WRITE) {
+                dir = DMA_TO_DEVICE;
+        } else {
+                dir = DMA_FROM_DEVICE;
+        }
+
+        dma_unmap_sg(chan->device->dev, data->sg, data->sg_len, dir);
+
+        /*
+         * Use of DMA with scatter-gather is impossible.
+         * Give up with DMA and switch back to PIO mode.
+         */
+        if (status & MCI_RXDATAAVLBLMASK) {
+                dev_err(mmc_dev(host->mmc), "buggy DMA detected. Taking evasive action.\n");
+                mmci_dma_release(host);
+        }
+}
+
+static void mmci_dma_data_error(struct mmci_host *host)
+{
+        dev_err(mmc_dev(host->mmc), "error during DMA transfer!\n");
+        dmaengine_terminate_all(host->dma_current);
+}
+
+static int mmci_dma_start_data(struct mmci_host *host, unsigned int datactrl)
+{
+        struct variant_data *variant = host->variant;
+        struct dma_slave_config conf = {
+                .src_addr = host->phybase + MMCIFIFO,
+                .dst_addr = host->phybase + MMCIFIFO,
+                .src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES,
+                .dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES,
+                .src_maxburst = variant->fifohalfsize >> 2, /* # of words */
+                .dst_maxburst = variant->fifohalfsize >> 2, /* # of words */
+        };
+        struct mmc_data *data = host->data;
+        struct dma_chan *chan;
+        struct dma_device *device;
+        struct dma_async_tx_descriptor *desc;
+        int nr_sg;
+
+        host->dma_current = NULL;
+
+        if (data->flags & MMC_DATA_READ) {
+                conf.direction = DMA_FROM_DEVICE;
+                chan = host->dma_rx_channel;
+        } else {
+                conf.direction = DMA_TO_DEVICE;
+                chan = host->dma_tx_channel;
+        }
+
+        /* If there's no DMA channel, fall back to PIO */
+        if (!chan)
+                return -EINVAL;
+
+        /* If less than or equal to the fifo size, don't bother with DMA */
+        if (host->size <= variant->fifosize)
+                return -EINVAL;
+
+        device = chan->device;
+        nr_sg = dma_map_sg(device->dev, data->sg, data->sg_len, conf.direction);
+        if (nr_sg == 0)
+                return -EINVAL;
+
+        dmaengine_slave_config(chan, &conf);
+        desc = device->device_prep_slave_sg(chan, data->sg, nr_sg,
+                                            conf.direction, DMA_CTRL_ACK);
+        if (!desc)
+                goto unmap_exit;
+
+        /* Okay, go for it. */
+        host->dma_current = chan;
+
+        dev_vdbg(mmc_dev(host->mmc),
+                 "Submit MMCI DMA job, sglen %d blksz %04x blks %04x flags %08x\n",
+                 data->sg_len, data->blksz, data->blocks, data->flags);
+        dmaengine_submit(desc);
+        dma_async_issue_pending(chan);
+
+        datactrl |= MCI_DPSM_DMAENABLE;
+
+        /* Trigger the DMA transfer */
+        writel(datactrl, host->base + MMCIDATACTRL);
+
+        /*
+         * Let the MMCI say when the data is ended and it's time
+         * to fire next DMA request. When that happens, MMCI will
+         * call mmci_data_end()
+         */
+        writel(readl(host->base + MMCIMASK0) | MCI_DATAENDMASK,
+               host->base + MMCIMASK0);
+        return 0;
+
+unmap_exit:
+        dmaengine_terminate_all(chan);
+        dma_unmap_sg(device->dev, data->sg, data->sg_len, conf.direction);
+        return -ENOMEM;
+}
+#else
+/* Blank functions if the DMA engine is not available */
+static inline void mmci_dma_setup(struct mmci_host *host)
+{
+}
+
+static inline void mmci_dma_release(struct mmci_host *host)
+{
+}
+
+static inline void mmci_dma_unmap(struct mmci_host *host, struct mmc_data *data)
+{
+}
+
+static inline void mmci_dma_data_error(struct mmci_host *host)
+{
+}
+
+static inline int mmci_dma_start_data(struct mmci_host *host, unsigned int datactrl)
+{
+        return -ENOSYS;
+}
+#endif
+
 static void mmci_start_data(struct mmci_host *host, struct mmc_data *data)
 {
         struct variant_data *variant = host->variant;
@@ -202,9 +443,7 @@ static void mmci_start_data(struct mmci_host *host, struct mmc_data *data)
 
         host->data = data;
         host->size = data->blksz * data->blocks;
-        host->data_xfered = 0;
-
-        mmci_init_sg(host, data);
+        data->bytes_xfered = 0;
 
         clks = (unsigned long long)data->timeout_ns * host->cclk;
         do_div(clks, 1000000000UL);
@@ -219,15 +458,29 @@ static void mmci_start_data(struct mmci_host *host, struct mmc_data *data)
         BUG_ON(1 << blksz_bits != data->blksz);
 
         datactrl = MCI_DPSM_ENABLE | blksz_bits << 4;
-        if (data->flags & MMC_DATA_READ) {
+
+        if (data->flags & MMC_DATA_READ)
                 datactrl |= MCI_DPSM_DIRECTION;
+
+        /*
+         * Attempt to use DMA operation mode, if this
+         * should fail, fall back to PIO mode
+         */
+        if (!mmci_dma_start_data(host, datactrl))
+                return;
+
+        /* IRQ mode, map the SG list for CPU reading/writing */
+        mmci_init_sg(host, data);
+
+        if (data->flags & MMC_DATA_READ) {
                 irqmask = MCI_RXFIFOHALFFULLMASK;
 
                 /*
-                 * If we have less than a FIFOSIZE of bytes to transfer,
-                 * trigger a PIO interrupt as soon as any data is available.
+                 * If we have less than the fifo 'half-full' threshold to
+                 * transfer, trigger a PIO interrupt as soon as any data
+                 * is available.
                  */
-                if (host->size < variant->fifosize)
+                if (host->size < variant->fifohalfsize)
                         irqmask |= MCI_RXDATAAVLBLMASK;
         } else {
                 /*
@@ -283,49 +536,51 @@ mmci_data_irq(struct mmci_host *host, struct mmc_data *data,
         if (status & (MCI_DATACRCFAIL|MCI_DATATIMEOUT|MCI_TXUNDERRUN|MCI_RXOVERRUN)) {
                 u32 remain, success;
 
-                /* Calculate how far we are into the transfer */
+                /* Terminate the DMA transfer */
+                if (dma_inprogress(host))
+                        mmci_dma_data_error(host);
+
+                /*
+                 * Calculate how far we are into the transfer.  Note that
+                 * the data counter gives the number of bytes transferred
+                 * on the MMC bus, not on the host side.  On reads, this
+                 * can be as much as a FIFO-worth of data ahead.  This
+                 * matters for FIFO overruns only.
+                 */
                 remain = readl(host->base + MMCIDATACNT);
                 success = data->blksz * data->blocks - remain;
 
-                dev_dbg(mmc_dev(host->mmc), "MCI ERROR IRQ (status %08x)\n", status);
+                dev_dbg(mmc_dev(host->mmc), "MCI ERROR IRQ, status 0x%08x at 0x%08x\n",
+                        status, success);
                 if (status & MCI_DATACRCFAIL) {
                         /* Last block was not successful */
-                        host->data_xfered = round_down(success - 1, data->blksz);
+                        success -= 1;
                         data->error = -EILSEQ;
                 } else if (status & MCI_DATATIMEOUT) {
-                        host->data_xfered = round_down(success, data->blksz);
                         data->error = -ETIMEDOUT;
-                } else if (status & (MCI_TXUNDERRUN|MCI_RXOVERRUN)) {
-                        host->data_xfered = round_down(success, data->blksz);
+                } else if (status & MCI_TXUNDERRUN) {
+                        data->error = -EIO;
+                } else if (status & MCI_RXOVERRUN) {
+                        if (success > host->variant->fifosize)
+                                success -= host->variant->fifosize;
+                        else
+                                success = 0;
                         data->error = -EIO;
                 }
-
-                /*
-                 * We hit an error condition.  Ensure that any data
-                 * partially written to a page is properly coherent.
-                 */
-                if (data->flags & MMC_DATA_READ) {
-                        struct sg_mapping_iter *sg_miter = &host->sg_miter;
-                        unsigned long flags;
-
-                        local_irq_save(flags);
-                        if (sg_miter_next(sg_miter)) {
-                                flush_dcache_page(sg_miter->page);
-                                sg_miter_stop(sg_miter);
-                        }
-                        local_irq_restore(flags);
-                }
+                data->bytes_xfered = round_down(success, data->blksz);
         }
 
         if (status & MCI_DATABLOCKEND)
                 dev_err(mmc_dev(host->mmc), "stray MCI_DATABLOCKEND interrupt\n");
 
         if (status & MCI_DATAEND || data->error) {
+                if (dma_inprogress(host))
+                        mmci_dma_unmap(host, data);
                 mmci_stop_data(host);
 
                 if (!data->error)
                         /* The error clause is handled above, success! */
-                        host->data_xfered += data->blksz * data->blocks;
+                        data->bytes_xfered = data->blksz * data->blocks;
 
                 if (!data->stop) {
                         mmci_request_end(host, data->mrq);
@@ -498,9 +753,6 @@ static irqreturn_t mmci_pio_irq(int irq, void *dev_id)
                 if (remain)
                         break;
 
-                if (status & MCI_RXACTIVE)
-                        flush_dcache_page(sg_miter->page);
-
                 status = readl(base + MMCISTATUS);
         } while (1);
 
@@ -509,10 +761,10 @@ static irqreturn_t mmci_pio_irq(int irq, void *dev_id)
         local_irq_restore(flags);
 
         /*
-         * If we're nearing the end of the read, switch to
-         * "any data available" mode.
+         * If we have less than the fifo 'half-full' threshold to transfer,
+         * trigger a PIO interrupt as soon as any data is available.
          */
-        if (status & MCI_RXACTIVE && host->size < variant->fifosize)
+        if (status & MCI_RXACTIVE && host->size < variant->fifohalfsize)
                 mmci_set_mask1(host, MCI_RXDATAAVLBLMASK);
 
         /*
@@ -713,7 +965,8 @@ static const struct mmc_host_ops mmci_ops = {
         .get_cd         = mmci_get_cd,
 };
 
-static int __devinit mmci_probe(struct amba_device *dev, struct amba_id *id)
+static int __devinit mmci_probe(struct amba_device *dev,
+        const struct amba_id *id)
 {
         struct mmci_platform_data *plat = dev->dev.platform_data;
         struct variant_data *variant = id->data;
@@ -776,6 +1029,7 @@ static int __devinit mmci_probe(struct amba_device *dev, struct amba_id *id)
                 dev_dbg(mmc_dev(mmc), "eventual mclk rate: %u Hz\n",
                         host->mclk);
         }
+        host->phybase = dev->res.start;
         host->base = ioremap(dev->res.start, resource_size(&dev->res));
         if (!host->base) {
                 ret = -ENOMEM;
@@ -903,9 +1157,12 @@ static int __devinit mmci_probe(struct amba_device *dev, struct amba_id *id)
 
         amba_set_drvdata(dev, mmc);
 
-        dev_info(&dev->dev, "%s: PL%03x rev%u at 0x%08llx irq %d,%d\n",
-                mmc_hostname(mmc), amba_part(dev), amba_rev(dev),
-                (unsigned long long)dev->res.start, dev->irq[0], dev->irq[1]);
+        dev_info(&dev->dev, "%s: PL%03x manf %x rev%u at 0x%08llx irq %d,%d (pio)\n",
+                 mmc_hostname(mmc), amba_part(dev), amba_manf(dev),
+                 amba_rev(dev), (unsigned long long)dev->res.start,
+                 dev->irq[0], dev->irq[1]);
+
+        mmci_dma_setup(host);
 
         mmc_add_host(mmc);
 
@@ -952,6 +1209,7 @@ static int __devexit mmci_remove(struct amba_device *dev)
                 writel(0, host->base + MMCICOMMAND);
                 writel(0, host->base + MMCIDATACTRL);
 
+                mmci_dma_release(host);
                 free_irq(dev->irq[0], host);
                 if (!host->singleirq)
                         free_irq(dev->irq[1], host);