On OMAP4, MMC1 & MMC2 controllers support ADMA feature which will
provide direct access to internal data.
Basically ADMA is a DMA controller embedded in the MMC controller.
It fetches each descriptor line [address+length+attributes] from a
descriptor table and executes the corresponding action [based on attributes].
Base address of Descriptor table in stored in MMCHS_ADMASAL register.
Signed-off-by: Kishore Kadiyala <kishore.kadiyala@xxxxxx>
Signed-off-by: Venkatraman S <svenkatr@xxxxxx>
Signed-off-by: Santosh Shilimkar <santosh.shilimkar@xxxxxx>
Reviewed-by: Sukumar Ghorai <s-ghorai@xxxxxx>
---
arch/arm/plat-omap/include/plat/mmc.h | 1 +
drivers/mmc/host/omap_hsmmc.c | 223 +++++++++++++++++++++++++++------
2 files changed, 184 insertions(+), 40 deletions(-)
diff --git a/arch/arm/plat-omap/include/plat/mmc.h b/arch/arm/plat-omap/include/plat/mmc.h
index f57f36a..b13e927 100644
--- a/arch/arm/plat-omap/include/plat/mmc.h
+++ b/arch/arm/plat-omap/include/plat/mmc.h
@@ -110,6 +110,7 @@ struct omap_mmc_platform_data {
/* we can put the features above into this variable */
#define HSMMC_HAS_PBIAS (1 << 0)
#define HSMMC_HAS_UPDATED_RESET (1 << 1)
+#define HSMMC_HAS_ADMA_SUPPORT (1 << 2)
unsigned features;
int switch_pin; /* gpio (card detect) */
diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c
index 7cf0383..aaa113b 100644
--- a/drivers/mmc/host/omap_hsmmc.c
+++ b/drivers/mmc/host/omap_hsmmc.c
@@ -51,12 +51,15 @@
#define OMAP_HSMMC_RSP54 0x0118
#define OMAP_HSMMC_RSP76 0x011C
#define OMAP_HSMMC_DATA 0x0120
+#define OMAP_HSMMC_PSTATE 0x0124
#define OMAP_HSMMC_HCTL 0x0128
#define OMAP_HSMMC_SYSCTL 0x012C
#define OMAP_HSMMC_STAT 0x0130
#define OMAP_HSMMC_IE 0x0134
#define OMAP_HSMMC_ISE 0x0138
#define OMAP_HSMMC_CAPA 0x0140
+#define OMAP_HSMMC_ADMA_ES 0x0154
+#define OMAP_HSMMC_ADMA_SAL 0x0158
#define VS18 (1 << 26)
#define VS30 (1 << 25)
@@ -104,6 +107,25 @@
#define SRD (1 << 26)
#define SOFTRESET (1 << 1)
#define RESETDONE (1 << 0)
+#define DMAS (0x2 << 3)
+#define CAPA_ADMA_SUPPORT (1 << 19)
+#define ADMA_XFER_VALID (1 << 0)
+#define ADMA_XFER_END (1 << 1)
+#define ADMA_XFER_LINK (1 << 4)
+#define ADMA_XFER_DESC (1 << 5)
+#define DMA_MNS_ADMA_MODE (1 << 20)
+#define ADMA_ERR (1 << 25)
+#define ADMA_XFER_INT (1 << 3)
+
+#define ADMA_TABLE_SZ (PAGE_SIZE)
+#define ADMA_TABLE_NUM_ENTRIES (ADMA_TABLE_SZ / sizeof(struct adma_desc_table))
+
+/*
+ * According to TRM, it is possible to transfer upto 64kB per ADMA table entry.
+ * But 64kB = 0x10000 cannot be represented using a 16bit integer
+ * in 1 ADMA table row. Hence rounding it to a lesser value.
+ */
+#define ADMA_MAX_XFER_PER_ROW (63 * 1024)
/*
* FIXME: Most likely all the data using these _DEVID defines should come
@@ -146,6 +168,13 @@
#define OMAP_HSMMC_WRITE(base, reg, val) \
__raw_writel((val), (base) + OMAP_HSMMC_##reg)
+/* ADMA descriptor table entry */
+struct adma_desc_table {
+ u16 attr;
+ u16 length;
+ dma_addr_t addr;
+};
+
struct omap_hsmmc_host {
struct device *dev;
struct mmc_host *mmc;
@@ -179,6 +208,8 @@ struct omap_hsmmc_host {
int irq;
int dma_ch;
int xfer_type; /* Transfer can be PIO/SDMA/ADMA */
+ struct adma_desc_table *adma_table;
+ dma_addr_t phy_adma_table;
int dma_line_tx, dma_line_rx;
int slot_id;
int got_dbclk;
@@ -877,6 +908,44 @@ static void omap_hsmmc_request_done(struct omap_hsmmc_host *host, struct mmc_req
}
/*
+ * SDMA clean up during SDMA transfers.
+ * Also unmapping of sg list in case of error/transfer done during
+ * SDMA/ADMA transfers.
+ */
+static void omap_hsmmc_xfer_cleanup(struct omap_hsmmc_host *host, int errno)
+{
+ int dma_ch;
+ struct mmc_data *data = errno ? host->data : host->mrq->data;
+
+ switch (host->xfer_type) {
+ case OMAP_HSMMC_USE_SDMA_XFER:
+ spin_lock(&host->irq_lock);
+ dma_ch = host->dma_ch;
+ host->dma_ch = -1;
+ spin_unlock(&host->irq_lock);
+ if (dma_ch != -1)
+ dma_unmap_sg(mmc_dev(host->mmc), data->sg,
+ host->dma_len,
+ omap_hsmmc_get_dma_dir(host, data));
+ omap_free_dma(dma_ch);
+ break;
+ case OMAP_HSMMC_USE_ADMA_XFER:
+ dma_unmap_sg(mmc_dev(host->mmc), data->sg,
+ host->dma_len, omap_hsmmc_get_dma_dir(host, data));
+ break;
+ case OMAP_HSMMC_USE_PIO_XFER:
+ /* TODO */
+ break;
+ default:
+ dev_dbg(mmc_dev(host->mmc), "Unknown xfer_type\n");
+ }
+ if (errno) {
+ host->data->error = errno;
+ host->data = NULL;
+ }
+}
+
+/*
* Notify the transfer complete to MMC core
*/
static void
@@ -898,6 +967,9 @@ omap_hsmmc_xfer_done(struct omap_hsmmc_host *host, struct mmc_data *data)
host->data = NULL;
+ if (host->xfer_type == OMAP_HSMMC_USE_ADMA_XFER)
+ omap_hsmmc_xfer_cleanup(host, 0);
+
if (!data->error)
data->bytes_xfered += data->blocks * (data->blksz);
else
@@ -935,40 +1007,6 @@ omap_hsmmc_cmd_done(struct omap_hsmmc_host *host, struct mmc_command *cmd)
}
/*
- * SDMA clean up during SDMA transfers.
- * Also unmapping of sg list in case of error/transfer done during
- * SDMA/ADMA transfers.
- */
-static void omap_hsmmc_xfer_cleanup(struct omap_hsmmc_host *host, int errno)
-{
- int dma_ch;
- struct mmc_data *data = errno ? host->data : host->mrq->data;
-
- switch (host->xfer_type) {
- case OMAP_HSMMC_USE_SDMA_XFER:
- spin_lock(&host->irq_lock);
- dma_ch = host->dma_ch;
- host->dma_ch = -1;
- spin_unlock(&host->irq_lock);
- if (dma_ch != -1)
- dma_unmap_sg(mmc_dev(host->mmc), data->sg,
- host->dma_len,
- omap_hsmmc_get_dma_dir(host, data));
- omap_free_dma(dma_ch);
- break;
- case OMAP_HSMMC_USE_PIO_XFER:
- /* TODO */
- break;
- default:
- dev_dbg(mmc_dev(host->mmc), "Unknown xfer_type\n");
- }
- if (errno) {
- host->data->error = errno;
- host->data = NULL;
- }
-}
-
-/*
* Readable error output
*/
#ifdef CONFIG_MMC_DEBUG
@@ -976,10 +1014,10 @@ static void omap_hsmmc_report_irq(struct omap_hsmmc_host *host, u32 status)
{
/* --- means reserved bit without definition at documentation */
static const char *omap_hsmmc_status_bits[] = {
- "CC", "TC", "BGE", "---", "BWR", "BRR", "---", "---", "CIRQ",
- "OBI", "---", "---", "---", "---", "---", "ERRI", "CTO", "CCRC",
- "CEB", "CIE", "DTO", "DCRC", "DEB", "---", "ACE", "---",
- "---", "---", "---", "CERR", "CERR", "BADA", "---", "---", "---"
+ "CC", "TC", "BGE", "DMA", "BWR", "BRR", "CINS", "CREM", "CIRQ",
+ "OBI", "BSR", "---", "---", "---", "---", "ERRI", "CTO", "CCRC",
+ "CEB", "CIE", "DTO", "DCRC", "DEB", "CLE", "ACE", "ADMA",
+ "---", "---", "CERR", "BADA", "---", "---"
};
char res[256];
char *buf = res;
@@ -1100,6 +1138,24 @@ static void omap_hsmmc_do_irq(struct omap_hsmmc_host *host, int status)
if (host->data)
end_trans = 1;
}
+ if (status & ADMA_ERR) {
+ dev_dbg(mmc_dev(host->mmc),
+ "ADMA err: ADMA_ES=%x, SAL=%x; Ignored!\n",
+ OMAP_HSMMC_READ(host->base, ADMA_ES),
+ OMAP_HSMMC_READ(host->base, ADMA_SAL));
+ if (host->cmd)
+ end_cmd = 1;
+ if (host->data)
+ end_trans = 1;
+ }
+ }
+ if (status & ADMA_XFER_INT) {
+ dev_dbg(mmc_dev(host->mmc),
+ "ADMA XFERINT: blk=%x at table=%x pstate=%x\n",
+ OMAP_HSMMC_READ(host->base, BLK),
+ OMAP_HSMMC_READ(host->base, ADMA_SAL),
+ OMAP_HSMMC_READ(host->base, PSTATE));
+
}
OMAP_HSMMC_WRITE(host->base, STAT, status);
@@ -1402,6 +1458,63 @@ static int omap_hsmmc_start_dma_transfer(struct omap_hsmmc_host *host,
return 0;
}
+static int mmc_populate_adma_desc_table(struct omap_hsmmc_host *host,
+ struct mmc_request *req, struct adma_desc_table *pdesc)
+{
+ int i, j, dmalen;
+ int splitseg, xferaddr;
+ int numblocks = 0;
+ dma_addr_t dmaaddr;
+ struct mmc_data *data = req->data;
+
+ host->dma_len = dma_map_sg(mmc_dev(host->mmc), data->sg,
+ data->sg_len, omap_hsmmc_get_dma_dir(host, data));
+ for (i = 0, j = 0; i < host->dma_len; i++) {
+ dmaaddr = sg_dma_address(data->sg + i);
+ dmalen = sg_dma_len(data->sg + i);
+ numblocks += dmalen / data->blksz;
+
+ if (dmalen <= ADMA_MAX_XFER_PER_ROW) {
+ pdesc[i + j].length = dmalen;
+ pdesc[i + j].addr = dmaaddr;
+ pdesc[i + j].attr = (ADMA_XFER_DESC |
+ ADMA_XFER_VALID);
+ } else {
+ /* Each descriptor row can only support
+ * transfer upto ADMA_MAX_XFER_PER_ROW.
+ * If the current segment is bigger, it has to be
+ * split to multiple ADMA table entries.
+ */
+ xferaddr = 0;
+ do {
+ splitseg = min(dmalen, ADMA_MAX_XFER_PER_ROW);
+ dmalen -= splitseg;
+ pdesc[i + j].length = splitseg;
+ pdesc[i + j].addr = dmaaddr + xferaddr;
+ xferaddr += splitseg;
+ pdesc[i + j].attr = (ADMA_XFER_DESC |
+ ADMA_XFER_VALID);
+ j++;
+ } while (dmalen);
+ j--; /* Compensate for i++ */
+ }
+ }
+ /* Setup last entry to terminate */
+ pdesc[i + j - 1].attr |= ADMA_XFER_END;
+ WARN_ON((i + j - 1) > ADMA_TABLE_NUM_ENTRIES);
+ dev_dbg(mmc_dev(host->mmc),
+ "ADMA table has %d entries from %d sglist\n",
+ i + j, host->dma_len);
+ return numblocks;
+}
+
+static void omap_hsmmc_start_adma_transfer(struct omap_hsmmc_host *host)
+{
+ /* Enforcing ordering in write operations */
+ wmb();
+ OMAP_HSMMC_WRITE(host->base, ADMA_SAL, host->phy_adma_table);
+}
+
static void set_data_timeout(struct omap_hsmmc_host *host,
unsigned int timeout_ns,
unsigned int timeout_clks)
@@ -1446,6 +1559,7 @@ static int
omap_hsmmc_prepare_data(struct omap_hsmmc_host *host, struct mmc_request *req)
{
int ret;
+ int numblks;
host->data = req->data;
if (req->data == NULL) {
@@ -1463,12 +1577,17 @@ omap_hsmmc_prepare_data(struct omap_hsmmc_host *host, struct mmc_request *req)
| (req->data->blocks << 16));
set_data_timeout(host, req->data->timeout_ns, req->data->timeout_clks);
- if (host->xfer_type) {
+ if (host->xfer_type == OMAP_HSMMC_USE_SDMA_XFER) {
ret = omap_hsmmc_start_dma_transfer(host, req);
if (ret != 0) {
dev_dbg(mmc_dev(host->mmc), "MMC start dma failure\n");
return ret;
}
+ } else if (host->xfer_type == OMAP_HSMMC_USE_ADMA_XFER) {
+ numblks = mmc_populate_adma_desc_table(host, req,
+ host->adma_table);
+ WARN_ON(numblks != req->data->blocks);
+ omap_hsmmc_start_adma_transfer(host);
}
return 0;
}
@@ -1667,6 +1786,11 @@ static void omap_hsmmc_conf_bus_power(struct omap_hsmmc_host *host)
capa = VS18;
}
+ if (host->xfer_type == OMAP_HSMMC_USE_ADMA_XFER) {
+ hctl |= DMAS;
+ value = OMAP_HSMMC_READ(host->base, CON);
+ OMAP_HSMMC_WRITE(host->base, CON, value | DMA_MNS_ADMA_MODE);
+ }
value = OMAP_HSMMC_READ(host->base, HCTL) & ~SDVS_MASK;
OMAP_HSMMC_WRITE(host->base, HCTL, value | hctl);
@@ -2024,7 +2148,7 @@ static int __init omap_hsmmc_probe(struct platform_device *pdev)
struct mmc_host *mmc;
struct omap_hsmmc_host *host = NULL;
struct resource *res;
- int ret, irq;
+ int ret, irq, capa;
if (pdata == NULL) {
dev_err(&pdev->dev, "Platform Data is missing\n");
@@ -2162,6 +2286,19 @@ static int __init omap_hsmmc_probe(struct platform_device *pdev)
if (mmc_slot(host).nonremovable)
mmc->caps |= MMC_CAP_NONREMOVABLE;
+ if (mmc_slot(host).features & HSMMC_HAS_ADMA_SUPPORT) {
+ capa = OMAP_HSMMC_READ(host->base, CAPA);
+ if (capa & CAPA_ADMA_SUPPORT) {
+ /* Allocating memory for ADMA Descriptor Table */
+ host->adma_table = dma_alloc_coherent(NULL,
+ ADMA_TABLE_SZ, &host->phy_adma_table, 0);
+ /* If allocation is success go with ADMA else SDMA */
+ if (host->adma_table != NULL)
+ host->xfer_type = OMAP_HSMMC_USE_ADMA_XFER;
+ }
+ }
+ dev_dbg(mmc_dev(host->mmc), "xfer_type=%d\n", host->xfer_type);
+
omap_hsmmc_conf_bus_power(host);
/* Select DMA lines */
@@ -2277,6 +2414,9 @@ err_irq:
clk_put(host->dbclk);
}
err1:
+ if (host->adma_table != NULL)
+ dma_free_coherent(NULL, ADMA_TABLE_SZ,
+ host->adma_table, host->phy_adma_table);
iounmap(host->base);
platform_set_drvdata(pdev, NULL);
mmc_free_host(mmc);
@@ -2304,6 +2444,9 @@ static int omap_hsmmc_remove(struct platform_device *pdev)
free_irq(mmc_slot(host).card_detect_irq, host);
flush_scheduled_work();
+ if (host->adma_table != NULL)
+ dma_free_coherent(NULL, ADMA_TABLE_SZ,
+ host->adma_table, host->phy_adma_table);
mmc_host_disable(host->mmc);
clk_disable(host->iclk);
clk_put(host->fclk);
--
1.7.1
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