>From f850f29297156c673fe3453c4c1c4642c46567e2 Mon Sep 17 00:00:00 2001
From: Manuel Lauss <mlau@xxxxxxxxxx>
Date: Wed, 7 May 2008 15:04:51 +0200
Subject: [PATCH] au1xmmc: 4 bit transfer mode
Add 4 Bit transfer mode support.
Signed-off-by: Manuel Lauss <mano@xxxxxxxxxxxxxxxxxxxxxxx>
---
drivers/mmc/host/au1xmmc.c | 21 +++++++++++++++++----
1 files changed, 17 insertions(+), 4 deletions(-)
diff --git a/drivers/mmc/host/au1xmmc.c b/drivers/mmc/host/au1xmmc.c
index 8660f86..d9e334f 100644
--- a/drivers/mmc/host/au1xmmc.c
+++ b/drivers/mmc/host/au1xmmc.c
@@ -161,13 +161,13 @@ 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 */
@@ -762,6 +762,7 @@ 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 config;
if (ios->power_mode == MMC_POWER_OFF)
au1xmmc_set_power(host, 0);
@@ -773,6 +774,18 @@ static void au1xmmc_set_ios(struct mmc_host* mmc, struct mmc_ios* ios)
au1xmmc_set_clock(host, ios->clock);
host->clock = ios->clock;
}
+
+ config = au_readl(HOST_CONFIG2(host));
+ switch (ios->bus_width) {
+ case MMC_BUS_WIDTH_4:
+ config |= (1 << 8);
+ break;
+ case MMC_BUS_WIDTH_1:
+ config &= ~(1 << 8);
+ break;
+ }
+ au_writel(config, HOST_CONFIG2(host));
+ au_sync();
}
static void au1xmmc_dma_callback(int irq, void *dev_id)
@@ -985,7 +998,7 @@ 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->id = pdev->id;
host->status = HOST_S_IDLE;
--
1.5.5.1
