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ARM: 6244/1: mmci: add variant data and default MCICLOCK support

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Add a variant_data structure to handle the differences between the
various variants of this peripheral.  Add a first quirk for a default
MCICLOCK value, required on the Ux500 variant where the enable bit needs
to be always set, since it controls access to some registers.

Acked-by: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: Rabin Vincent <rabin.vincent@stericsson.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Rabin Vincent 2010-07-21 12:54:40 +01:00 committed by Russell King
parent bb8f563c84
commit 4956e10903
2 changed files with 32 additions and 1 deletions
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31
drivers/mmc/host/mmci.c
View File

@ -36,12 +36,30 @@
static unsigned int fmax = 515633;
/**
* struct variant_data - MMCI variant-specific quirks
* @clkreg: default value for MCICLOCK register
*/
struct variant_data {
unsigned int clkreg;
};
static struct variant_data variant_arm = {
};
static struct variant_data variant_u300 = {
};
static struct variant_data variant_ux500 = {
.clkreg = MCI_CLK_ENABLE,
};
/*
* This must be called with host->lock held
*/
static void mmci_set_clkreg(struct mmci_host *host, unsigned int desired)
{
u32 clk = 0;
struct variant_data *variant = host->variant;
u32 clk = variant->clkreg;
if (desired) {
if (desired >= host->mclk) {
@ -563,6 +581,7 @@ static const struct mmc_host_ops mmci_ops = {
static int __devinit mmci_probe(struct amba_device *dev, struct amba_id *id)
{
struct mmci_platform_data *plat = dev->dev.platform_data;
struct variant_data *variant = id->data;
struct mmci_host *host;
struct mmc_host *mmc;
int ret;
@ -606,6 +625,7 @@ static int __devinit mmci_probe(struct amba_device *dev, struct amba_id *id)
goto clk_free;
host->plat = plat;
host->variant = variant;
host->mclk = clk_get_rate(host->clk);
/*
* According to the spec, mclk is max 100 MHz,
@ -845,19 +865,28 @@ static struct amba_id mmci_ids[] = {
{
.id = 0x00041180,
.mask = 0x000fffff,
.data = &variant_arm,
},
{
.id = 0x00041181,
.mask = 0x000fffff,
.data = &variant_arm,
},
/* ST Micro variants */
{
.id = 0x00180180,
.mask = 0x00ffffff,
.data = &variant_u300,
},
{
.id = 0x00280180,
.mask = 0x00ffffff,
.data = &variant_u300,
},
{
.id = 0x00480180,
.mask = 0x00ffffff,
.data = &variant_ux500,
},
{ 0, 0 },
};

2
drivers/mmc/host/mmci.h
View File

@ -145,6 +145,7 @@
#define NR_SG 16
struct clk;
struct variant_data;
struct mmci_host {
void __iomem *base;
@ -164,6 +165,7 @@ struct mmci_host {
unsigned int cclk;
u32 pwr;
struct mmci_platform_data *plat;
struct variant_data *variant;
u8 hw_designer;
u8 hw_revision:4;