linux-mips
[Top] [All Lists]

[PATCH] au1xmmc: enable 4 bit transfer mode

Subject: [PATCH] au1xmmc: enable 4 bit transfer mode
From: Manuel Lauss <mlau@msc-ge.com>
Date: Sat, 17 May 2008 17:53:57 +0200
Signed-off-by: Manuel Lauss <mano@roarinelk.homelinux.net>
---
 drivers/mmc/host/au1xmmc.c |   22 +++++++++++++++++-----
 1 files changed, 17 insertions(+), 5 deletions(-)

diff --git a/drivers/mmc/host/au1xmmc.c b/drivers/mmc/host/au1xmmc.c
index d8776d6..2bd4cf4 100644
--- a/drivers/mmc/host/au1xmmc.c
+++ b/drivers/mmc/host/au1xmmc.c
@@ -95,14 +95,13 @@ static inline void IRQ_OFF(struct au1xmmc_host *host, u32 
mask)
 
 static inline void SEND_STOP(struct au1xmmc_host *host)
 {
-
-       /* We know the value of CONFIG2, so avoid a read we don't need */
-       u32 mask = SD_CONFIG2_EN;
+       u32 config2;
 
        WARN_ON(host->status != HOST_S_DATA);
        host->status = HOST_S_STOP;
 
-       au_writel(mask | SD_CONFIG2_DF, HOST_CONFIG2(host));
+       config2 = au_readl(HOST_CONFIG2(host));
+       au_writel(config2 | SD_CONFIG2_DF, HOST_CONFIG2(host));
        au_sync();
 
        /* Send the stop commmand */
@@ -697,6 +696,7 @@ static void au1xmmc_reset_controller(struct au1xmmc_host 
*host)
 static void au1xmmc_set_ios(struct mmc_host* mmc, struct mmc_ios* ios)
 {
        struct au1xmmc_host *host = mmc_priv(mmc);
+       u32 config2;
 
        if (ios->power_mode == MMC_POWER_OFF)
                au1xmmc_set_power(host, 0);
@@ -708,6 +708,18 @@ static void au1xmmc_set_ios(struct mmc_host* mmc, struct 
mmc_ios* ios)
                au1xmmc_set_clock(host, ios->clock);
                host->clock = ios->clock;
        }
+
+       config2 = au_readl(HOST_CONFIG2(host));
+       switch (ios->bus_width) {
+       case MMC_BUS_WIDTH_4:
+               config2 |= SD_CONFIG2_WB;
+               break;
+       case MMC_BUS_WIDTH_1:
+               config2 &= ~SD_CONFIG2_WB;
+               break;
+       }
+       au_writel(config2, HOST_CONFIG2(host));
+       au_sync();
 }
 
 #define STATUS_TIMEOUT (SD_STATUS_RAT | SD_STATUS_DT)
@@ -952,7 +964,7 @@ static int __devinit au1xmmc_probe(struct platform_device 
*pdev)
        mmc->max_blk_count = 512;
 
        mmc->ocr_avail = AU1XMMC_OCR;
-       mmc->caps = 0;
+       mmc->caps = MMC_CAP_4_BIT_DATA;
 
        host->status = HOST_S_IDLE;
 
-- 
1.5.5.3


<Prev in Thread] Current Thread [Next in Thread>
  • [PATCH] au1xmmc: enable 4 bit transfer mode, Manuel Lauss <=