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ARM: 6438/2: mmci: add SDIO support for ST Variants

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This adds some minor variant data and trickery to enable SDIO
on the ST Micro variants of MMCI/PL180.

Signed-off-by: Marcin Mielczarczyk <marcin.mielczarczyk@tieto.com>
Signed-off-by: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Linus Walleij 2010-10-19 12:43:58 +01:00 committed by Russell King
parent f20f8f21e0
commit 3417780200
1 changed files with 36 additions and 1 deletions
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37
drivers/mmc/host/mmci.c
View file

@ -19,6 +19,7 @@
#include <linux/highmem.h>
#include <linux/log2.h>
#include <linux/mmc/host.h>
#include <linux/mmc/card.h>
#include <linux/amba/bus.h>
#include <linux/clk.h>
#include <linux/scatterlist.h>
@ -49,6 +50,7 @@ static unsigned int fmax = 515633;
* and will not work at all.
* @broken_blockend_dma: the MCI_DATABLOCKEND is broken on the hardware when
* using DMA.
* @sdio: variant supports SDIO
*/
struct variant_data {
unsigned int clkreg;
@ -58,6 +60,7 @@ struct variant_data {
unsigned int fifohalfsize;
bool broken_blockend;
bool broken_blockend_dma;
bool sdio;
};
static struct variant_data variant_arm = {
@ -72,6 +75,7 @@ static struct variant_data variant_u300 = {
.clkreg_enable = 1 << 13, /* HWFCEN */
.datalength_bits = 16,
.broken_blockend_dma = true,
.sdio = true,
};
static struct variant_data variant_ux500 = {
@ -81,6 +85,7 @@ static struct variant_data variant_ux500 = {
.clkreg_enable = 1 << 14, /* HWFCEN */
.datalength_bits = 24,
.broken_blockend = true,
.sdio = true,
};
/*
* This must be called with host->lock held
@ -222,6 +227,11 @@ static void mmci_start_data(struct mmci_host *host, struct mmc_data *data)
irqmask = MCI_TXFIFOHALFEMPTYMASK;
}
/* The ST Micro variants has a special bit to enable SDIO */
if (variant->sdio && host->mmc->card)
if (mmc_card_sdio(host->mmc->card))
datactrl |= MCI_ST_DPSM_SDIOEN;
writel(datactrl, base + MMCIDATACTRL);
writel(readl(base + MMCIMASK0) & ~MCI_DATAENDMASK, base + MMCIMASK0);
mmci_set_mask1(host, irqmask);
@ -429,7 +439,32 @@ static int mmci_pio_write(struct mmci_host *host, char *buffer, unsigned int rem
variant->fifosize : variant->fifohalfsize;
count = min(remain, maxcnt);
writesl(base + MMCIFIFO, ptr, count >> 2);
/*
* The ST Micro variant for SDIO transfer sizes
* less then 8 bytes should have clock H/W flow
* control disabled.
*/
if (variant->sdio &&
mmc_card_sdio(host->mmc->card)) {
if (count < 8)
writel(readl(host->base + MMCICLOCK) &
~variant->clkreg_enable,
host->base + MMCICLOCK);
else
writel(readl(host->base + MMCICLOCK) |
variant->clkreg_enable,
host->base + MMCICLOCK);
}
/*
* SDIO especially may want to send something that is
* not divisible by 4 (as opposed to card sectors
* etc), and the FIFO only accept full 32-bit writes.
* So compensate by adding +3 on the count, a single
* byte become a 32bit write, 7 bytes will be two
* 32bit writes etc.
*/
writesl(base + MMCIFIFO, ptr, (count + 3) >> 2);
ptr += count;
remain -= count;