leandrof/linux
1
0
Fork 0
forked from Minki/linux
Code Issues Pull Requests Packages Projects Releases Wiki Activity

[ARM] 4709/1: pxa: mmc: add 26MHz support for pxa3[0|1]0 mmc controller

Browse Source 
pxa3[0|1]0 mmc controller can support 26MHz clock mode, they support
SD spec 1.1 and MMC spec 4.0 which specify high speed mode. So host
caps will include MMC_CAP_MMC_HIGHSPEED and MMC_CAP_SD_HIGHSPEED for
pxa3[0|1]0.

This patch is to add 26MHz support for them. pxa host clock will be
set to 26MHz mode when the card supported max clock rate is higher
than or equal to 26MHz.

Signed-off-by: Bridge Wu <bridge.wu@marvell.com>
Acked-by: Pierre Ossman <drzeus@drzeus.cx>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Bridge Wu 2007-12-13 07:24:30 +01:00 committed by Russell King
parent 9e2697ff37
commit 64eb036af4
1 changed files with 22 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

31
drivers/mmc/host/pxamci.c
View File

@ -375,14 +375,23 @@ static void pxamci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
if (host->clkrt == CLKRT_OFF)
clk_enable(host->clk);
/*
* clk might result in a lower divisor than we
* desire. check for that condition and adjust
* as appropriate.
*/
if (rate / clk > ios->clock)
clk <<= 1;
host->clkrt = fls(clk) - 1;
if (ios->clock == 26000000) {
/* to support 26MHz on pxa300/pxa310 */
host->clkrt = 7;
} else {
/* to handle (19.5MHz, 26MHz) */
if (!clk)
clk = 1;
/*
* clk might result in a lower divisor than we
* desire. check for that condition and adjust
* as appropriate.
*/
if (rate / clk > ios->clock)
clk <<= 1;
host->clkrt = fls(clk) - 1;
}
/*
* we write clkrt on the next command
@ -519,7 +528,8 @@ static int pxamci_probe(struct platform_device *pdev)
* Calculate minimum clock rate, rounding up.
*/
mmc->f_min = (host->clkrate + 63) / 64;
mmc->f_max = host->clkrate;
mmc->f_max = (cpu_is_pxa300() || cpu_is_pxa310()) ? 26000000
: host->clkrate;
mmc->ocr_avail = host->pdata ?
host->pdata->ocr_mask :
@ -529,6 +539,9 @@ static int pxamci_probe(struct platform_device *pdev)
if (!cpu_is_pxa21x() && !cpu_is_pxa25x()) {
mmc->caps |= MMC_CAP_4_BIT_DATA | MMC_CAP_SDIO_IRQ;
host->cmdat |= CMDAT_SDIO_INT_EN;
if (cpu_is_pxa300() || cpu_is_pxa310())
mmc->caps |= MMC_CAP_MMC_HIGHSPEED |
MMC_CAP_SD_HIGHSPEED;
}
host->sg_cpu = dma_alloc_coherent(&pdev->dev, PAGE_SIZE, &host->sg_dma, GFP_KERNEL);