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authorAlexey Brodkin <Alexey.Brodkin@synopsys.com>2013-12-26 15:29:07 +0400
committerPantelis Antoniou <panto@antoniou-consulting.com>2014-01-09 11:29:02 +0200
commit2a7a210e2cb724f4a941786e58878baf6edce846 (patch)
tree93c6f0d3fda536d74ebb160392398a089526f98d /drivers/mmc/dw_mmc.c
parentf931483e4e41b7f3d738077040385b1776f635dc (diff)
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mmc/dwmmc: use bounce buffer for data exchange between CPU and MMC controller
Bounce buffer implementation takes care of proper data buffer alignemt and correct flush/invalidation of data cache at once so we no longer depend on input data variety and make sure CPU and MMC controller deal with expected data in case of enabled data cache. Bounce buffer requires to add its definition (CONFIG_BOUNCE_BUFFER) in board configuration, otherwise corresponding library won't be compiled and linker will fail to build resulting executable. Difference since v1 - fixed compile-time warning with type casting to "void *": Slight edit to remove UTF8 characters in the commit message. Acked-by: Jaehoon Chung <jh80.chung@samsung.com> Tested-by: Jaehoon Chung <jh80.chung@samsung.com> Acked-by: Pantelis Antoniou <panto@antoniou-consulting.com> ==== passing argument 2 of 'bounce_buffer_start' discards 'const' qualifier from pointer target type ==== Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com> Cc: Mischa Jonker <mjonker@synopsys.com> Cc: Alim Akhtar <alim.akhtar@samsung.com> Cc: Rajeshwari Shinde <rajeshwari.s@samsung.com> Cc: Jaehoon Chung <jh80.chung@samsung.com> Cc: Amar <amarendra.xt@samsung.com> Cc: Kyungmin Park <kyungmin.park@samsung.com> Cc: Minkyu Kang <mk7.kang@samsung.com> Cc: Simon Glass <sjg@chromium.org> Cc: Pantelis Antoniou <panto@antoniou-consulting.com> Cc: Andy Fleming <afleming@gmail.com>
Diffstat (limited to 'drivers/mmc/dw_mmc.c')
-rwxr-xr-xdrivers/mmc/dw_mmc.c32
1 files changed, 22 insertions, 10 deletions
diff --git a/drivers/mmc/dw_mmc.c b/drivers/mmc/dw_mmc.c
index 82abe19..4cec5aa 100755
--- a/drivers/mmc/dw_mmc.c
+++ b/drivers/mmc/dw_mmc.c
@@ -6,6 +6,7 @@
* SPDX-License-Identifier: GPL-2.0+
*/
+#include <bouncebuf.h>
#include <common.h>
#include <malloc.h>
#include <mmc.h>
@@ -41,11 +42,13 @@ static void dwmci_set_idma_desc(struct dwmci_idmac *idmac,
}
static void dwmci_prepare_data(struct dwmci_host *host,
- struct mmc_data *data, struct dwmci_idmac *cur_idmac)
+ struct mmc_data *data,
+ struct dwmci_idmac *cur_idmac,
+ void *bounce_buffer)
{
unsigned long ctrl;
unsigned int i = 0, flags, cnt, blk_cnt;
- ulong data_start, data_end, start_addr;
+ ulong data_start, data_end;
blk_cnt = data->blocks;
@@ -55,11 +58,6 @@ static void dwmci_prepare_data(struct dwmci_host *host,
data_start = (ulong)cur_idmac;
dwmci_writel(host, DWMCI_DBADDR, (unsigned int)cur_idmac);
- if (data->flags == MMC_DATA_READ)
- start_addr = (unsigned int)data->dest;
- else
- start_addr = (unsigned int)data->src;
-
do {
flags = DWMCI_IDMAC_OWN | DWMCI_IDMAC_CH ;
flags |= (i == 0) ? DWMCI_IDMAC_FS : 0;
@@ -70,7 +68,7 @@ static void dwmci_prepare_data(struct dwmci_host *host,
cnt = data->blocksize * 8;
dwmci_set_idma_desc(cur_idmac, flags, cnt,
- start_addr + (i * PAGE_SIZE));
+ (u32)bounce_buffer + (i * PAGE_SIZE));
if (blk_cnt <= 8)
break;
@@ -117,6 +115,7 @@ static int dwmci_send_cmd(struct mmc *mmc, struct mmc_cmd *cmd,
u32 retry = 10000;
u32 mask, ctrl;
ulong start = get_timer(0);
+ struct bounce_buffer bbstate;
while (dwmci_readl(host, DWMCI_STATUS) & DWMCI_BUSY) {
if (get_timer(start) > timeout) {
@@ -127,8 +126,19 @@ static int dwmci_send_cmd(struct mmc *mmc, struct mmc_cmd *cmd,
dwmci_writel(host, DWMCI_RINTSTS, DWMCI_INTMSK_ALL);
- if (data)
- dwmci_prepare_data(host, data, cur_idmac);
+ if (data) {
+ if (data->flags == MMC_DATA_READ) {
+ bounce_buffer_start(&bbstate, (void*)data->dest,
+ data->blocksize *
+ data->blocks, GEN_BB_WRITE);
+ } else {
+ bounce_buffer_start(&bbstate, (void*)data->src,
+ data->blocksize *
+ data->blocks, GEN_BB_READ);
+ }
+ dwmci_prepare_data(host, data, cur_idmac,
+ bbstate.bounce_buffer);
+ }
dwmci_writel(host, DWMCI_CMDARG, cmd->cmdarg);
@@ -204,6 +214,8 @@ static int dwmci_send_cmd(struct mmc *mmc, struct mmc_cmd *cmd,
ctrl = dwmci_readl(host, DWMCI_CTRL);
ctrl &= ~(DWMCI_DMA_EN);
dwmci_writel(host, DWMCI_CTRL, ctrl);
+
+ bounce_buffer_stop(&bbstate);
}
udelay(100);