[PATCH 03/03] omap hsmmc: adaptation of sdma descriptor autoloading feature

Venkatraman S
2010-03-10T14:12:25Z

See previous post http://patchwork.kernel.org/patch/82909/.
Rebased to 2.6.34-rc1

CC: Adrian Hunter <adrian.hunter@nokia.com>
CC: Madhusudhan C <madhu.cr@ti.com>
CC: Tony Lindgren <tony@atomide.com>
Signed-off-by: Venkatraman S <svenkatr@ti.com>
---
drivers/mmc/host/omap_hsmmc.c | 143 +++++++++++++++++++++++++++++++++++------
1 files changed, 122 insertions(+), 21 deletions(-)

diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c
index ea2a082..131d889 100644
--- a/drivers/mmc/host/omap_hsmmc.c
+++ b/drivers/mmc/host/omap_hsmmc.c
@@ -102,6 +102,7 @@
#define SRD (1 << 26)
#define SOFTRESET (1 << 1)
#define RESETDONE (1 << 0)
+#define DMA_ICR_QUIET 0xD00

/*
* FIXME: Most likely all the data using these _DEVID defines should come
@@ -118,6 +119,12 @@
#define OMAP_MMC_MASTER_CLOCK 96000000
#define DRIVER_NAME "mmci-omap-hs"

+#define DMA_TYPE_NODMA 0
+#define DMA_TYPE_SDMA 1
+#define DMA_TYPE_SDMA_DLOAD 2
+
+#define DMA_CTRL_BUF_SIZE (PAGE_SIZE * 3)
+
/* Timeouts for entering power saving states on inactivity, msec */
#define OMAP_MMC_DISABLED_TIMEOUT 100
#define OMAP_MMC_SLEEP_TIMEOUT 1000
@@ -172,7 +179,11 @@ struct omap_hsmmc_host {
u32 bytesleft;
int suspended;
int irq;
- int use_dma, dma_ch;
+ int dma_caps;
+ int dma_in_use;
+ int dma_ch;
+ void *dma_ctrl_buf;
+ dma_addr_t dma_ctrl_buf_phy;
int dma_line_tx, dma_line_rx;
int slot_id;
int got_dbclk;
@@ -768,7 +779,7 @@ omap_hsmmc_start_command(struct omap_hsmmc_host
*host, struct mmc_command *cmd,
OMAP_HSMMC_WRITE(host->base, STAT, STAT_CLEAR);
OMAP_HSMMC_WRITE(host->base, ISE, INT_EN_MASK);

- if (host->use_dma)
+ if (host->dma_in_use)
OMAP_HSMMC_WRITE(host->base, IE,
INT_EN_MASK & ~(BRR_ENABLE | BWR_ENABLE));
else
@@ -803,7 +814,7 @@ omap_hsmmc_start_command(struct omap_hsmmc_host
*host, struct mmc_command *cmd,
cmdreg &= ~(DDIR);
}

- if (host->use_dma)
+ if (host->dma_in_use)
cmdreg |= DMA_EN;

/*
@@ -850,7 +861,7 @@ omap_hsmmc_xfer_done(struct omap_hsmmc_host *host,
struct mmc_data *data)

host->data = NULL;

- if (host->use_dma && host->dma_ch != -1)
+ if (host->dma_in_use && host->dma_ch != -1)
dma_unmap_sg(mmc_dev(host->mmc), data->sg, host->dma_len,
omap_hsmmc_get_dma_dir(host, data));

@@ -900,7 +911,7 @@ static void omap_hsmmc_dma_cleanup(struct
omap_hsmmc_host *host, int errno)
{
host->data->error = errno;

- if (host->use_dma && host->dma_ch != -1) {
+ if (host->dma_in_use && host->dma_ch != -1) {
dma_unmap_sg(mmc_dev(host->mmc), host->data->sg, host->dma_len,
omap_hsmmc_get_dma_dir(host, host->data));
omap_free_dma(host->dma_ch);
@@ -1253,7 +1264,6 @@ static void omap_hsmmc_config_dma_params(struct
omap_hsmmc_host *host,
omap_hsmmc_get_dma_sync_dev(host, data),
!(data->flags & MMC_DATA_WRITE));

- omap_start_dma(dma_ch);
}

/*
@@ -1268,21 +1278,32 @@ static void omap_hsmmc_dma_cb(int lch, u16
ch_status, void *data)

if (host->dma_ch < 0)
return;
-
- host->dma_sg_idx++;
- if (host->dma_sg_idx < host->dma_len) {
- /* Fire up the next transfer. */
- omap_hsmmc_config_dma_params(host, host->data,
+ if (host->dma_in_use == DMA_TYPE_SDMA) {
+ host->dma_sg_idx++;
+ if (host->dma_sg_idx < host->dma_len) {
+ /* Fire up the next transfer. */
+ omap_hsmmc_config_dma_params(host, host->data,
host->data->sg + host->dma_sg_idx);
- return;
+ omap_start_dma(host->dma_ch);
+ return;
+ }
}

}

+static int omap_hsmmc_start_dma_transfer(struct omap_hsmmc_host *host)
+{
+ if (host->dma_in_use == DMA_TYPE_SDMA)
+ omap_start_dma(host->dma_ch);
+ else if (host->dma_in_use == DMA_TYPE_SDMA_DLOAD)
+ return omap_start_dma_sglist_transfers(host->dma_ch, -1);
+
+ return 0;
+}
/*
- * Routine to configure and start DMA for the MMC card
+ * Routine to configure DMA for the MMC card
*/
-static int omap_hsmmc_start_dma_transfer(struct omap_hsmmc_host *host,
+static int omap_hsmmc_configure_sdma(struct omap_hsmmc_host *host,
struct mmc_request *req)
{
int dma_ch = 0, ret = 0, err = 1, i;
@@ -1339,6 +1360,56 @@ static int omap_hsmmc_start_dma_transfer(struct
omap_hsmmc_host *host,
return 0;
}

+static int omap_hsmmc_configure_sdma_sglist(struct omap_hsmmc_host *host,
+ struct mmc_request *req)
+{
+ int i;
+ struct omap_dma_sglist_node *sglist, *snode;
+ struct mmc_data *data = req->data;
+ int blksz;
+ int dmadir = omap_hsmmc_get_dma_dir(host, data);
+ struct omap_dma_sglist_type2a_params *t2p;
+
+ sglist = (struct omap_dma_sglist_node *) host->dma_ctrl_buf;
+ snode = sglist;
+ blksz = host->data->blksz;
+
+ if ((host->dma_len * sizeof(*snode)) > DMA_CTRL_BUF_SIZE) {
+ dev_err(mmc_dev(host->mmc), "not enough sglist memory %d\n",
+ host->dma_len);
+ return -ENOMEM;
+ }
+ for (i = 0; i < host->dma_len; snode++, i++) {
+ snode->desc_type = OMAP_DMA_SGLIST_DESCRIPTOR_TYPE2a;
+ snode->num_of_elem = blksz / 4;
+ t2p = &snode->sg_node.t2a;
+
+ if (dmadir == DMA_FROM_DEVICE) {
+ t2p->src_addr = host->mapbase + OMAP_HSMMC_DATA;
+ t2p->dst_addr = sg_dma_address(data->sg + i);
+ } else {
+ t2p->dst_addr = host->mapbase + OMAP_HSMMC_DATA;
+ t2p->src_addr = sg_dma_address(data->sg + i);
+ }
+ snode->flags =
+ OMAP_DMA_LIST_DST_VALID | OMAP_DMA_LIST_SRC_VALID;
+
+ t2p->cfn_fn = sg_dma_len(data->sg + i) / host->data->blksz;
+ t2p->cicr = DMA_ICR_QUIET;
+
+ t2p->dst_frame_idx_or_pkt_size = 0;
+ t2p->src_frame_idx_or_pkt_size = 0;
+ t2p->dst_elem_idx = 0;
+ t2p->src_elem_idx = 0;
+ }
+ dev_dbg(mmc_dev(host->mmc), "new sglist %x len =%d\n",
+ host->dma_ctrl_buf_phy, i);
+ omap_set_dma_sglist_mode(host->dma_ch, sglist,
+ host->dma_ctrl_buf_phy, i, NULL);
+ omap_dma_set_sglist_fastmode(host->dma_ch, 1);
+ return 0;
+}
+
static void set_data_timeout(struct omap_hsmmc_host *host,
unsigned int timeout_ns,
unsigned int timeout_clks)
@@ -1400,14 +1471,23 @@ 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->use_dma) {
- ret = omap_hsmmc_start_dma_transfer(host, req);
- if (ret != 0) {
- dev_dbg(mmc_dev(host->mmc), "MMC start dma failure\n");
+ if (host->dma_caps & DMA_TYPE_SDMA) {
+ ret = omap_hsmmc_configure_sdma(host, req);
+ if (ret)
return ret;
- }
+ host->dma_in_use = DMA_TYPE_SDMA;
}
- return 0;
+ if ((host->dma_caps & DMA_TYPE_SDMA_DLOAD) &&
+ host->data->sg_len > 4) {
+ ret = omap_hsmmc_configure_sdma_sglist(host, req);
+ if (ret)
+ return ret;
+ host->dma_in_use = DMA_TYPE_SDMA_DLOAD;
+
+ }
+ ret = omap_hsmmc_start_dma_transfer(host);
+ return ret;
+
}

/*
@@ -1999,7 +2079,9 @@ static int __init omap_hsmmc_probe(struct
platform_device *pdev)
host->mmc = mmc;
host->pdata = pdata;
host->dev = &pdev->dev;
- host->use_dma = 1;
+ host->dma_caps = DMA_TYPE_SDMA;
+ host->dma_in_use = DMA_TYPE_NODMA;
+ host->dma_ctrl_buf = NULL;
host->dev->dma_mask = &pdata->dma_mask;
host->dma_ch = -1;
host->irq = irq;
@@ -2081,6 +2163,15 @@ static int __init omap_hsmmc_probe(struct
platform_device *pdev)
" clk failed\n");
}

+ if (cpu_is_omap44xx() || cpu_is_omap3630()) {
+ host->dma_ctrl_buf = dma_alloc_coherent(NULL,
+ DMA_CTRL_BUF_SIZE,
+ &host->dma_ctrl_buf_phy,
+ 0);
+ if (host->dma_ctrl_buf != NULL)
+ host->dma_caps |= DMA_TYPE_SDMA_DLOAD;
+ }
+
/* Since we do only SG emulation, we can have as many segs
* as we want. */
mmc->max_phys_segs = 1024;
@@ -2207,6 +2298,10 @@ err_reg:
err_irq_cd_init:
free_irq(host->irq, host);
err_irq:
+ if (host->dma_ctrl_buf)
+ dma_free_coherent(NULL, DMA_CTRL_BUF_SIZE,
+ host->dma_ctrl_buf,
+ host->dma_ctrl_buf_phy);
mmc_host_disable(host->mmc);
clk_disable(host->iclk);
clk_put(host->fclk);
@@ -2234,6 +2329,12 @@ static int omap_hsmmc_remove(struct
platform_device *pdev)
if (host) {
mmc_host_enable(host->mmc);
mmc_remove_host(host->mmc);
+
+ if (host->dma_ctrl_buf != NULL) {
+ dma_free_coherent(NULL, DMA_CTRL_BUF_SIZE,
+ host->dma_ctrl_buf,
+ host->dma_ctrl_buf_phy);
+ }
if (host->use_reg)
omap_hsmmc_reg_put(host);
if (host->pdata->cleanup)
--
1.6.3.3