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ARM: 6310/1: mmci: support different FIFO sizes 

The Ux500 variant has a 32-word FIFO (TXFIFOEMPTY is asserted when it
has 2 left) and TXFIFOHALFEMPTY is repurposed as TXFIFOBURSTWRITEABLE,
with a burst being defined as 8-words.  Likewise for RX.

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 2010-08-09 12:57:30 +01:00 committed by Russell King
parent 2971944582
commit 8301bb68c6
2 changed files with 19 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

22
drivers/mmc/host/mmci.c
View File

@ -41,23 +41,35 @@ static unsigned int fmax = 515633;
* @clkreg: default value for MCICLOCK register
* @clkreg_enable: enable value for MMCICLOCK register
* @datalength_bits: number of bits in the MMCIDATALENGTH register
* @fifosize: number of bytes that can be written when MMCI_TXFIFOEMPTY
* is asserted (likewise for RX)
* @fifohalfsize: number of bytes that can be written when MCI_TXFIFOHALFEMPTY
* is asserted (likewise for RX)
*/
struct variant_data {
unsigned int clkreg;
unsigned int clkreg_enable;
unsigned int datalength_bits;
unsigned int fifosize;
unsigned int fifohalfsize;
};
static struct variant_data variant_arm = {
.fifosize = 16 * 4,
.fifohalfsize = 8 * 4,
.datalength_bits = 16,
};
static struct variant_data variant_u300 = {
.fifosize = 16 * 4,
.fifohalfsize = 8 * 4,
.clkreg_enable = 1 << 13, /* HWFCEN */
.datalength_bits = 16,
};
static struct variant_data variant_ux500 = {
.fifosize = 30 * 4,
.fifohalfsize = 8 * 4,
.clkreg = MCI_CLK_ENABLE,
.clkreg_enable = 1 << 14, /* HWFCEN */
.datalength_bits = 24,
@ -138,6 +150,7 @@ static void mmci_init_sg(struct mmci_host *host, struct mmc_data *data)
static void mmci_start_data(struct mmci_host *host, struct mmc_data *data)
{
struct variant_data *variant = host->variant;
unsigned int datactrl, timeout, irqmask;
unsigned long long clks;
void __iomem *base;
@ -173,7 +186,7 @@ static void mmci_start_data(struct mmci_host *host, struct mmc_data *data)
* If we have less than a FIFOSIZE of bytes to transfer,
* trigger a PIO interrupt as soon as any data is available.
*/
if (host->size < MCI_FIFOSIZE)
if (host->size < variant->fifosize)
irqmask |= MCI_RXDATAAVLBLMASK;
} else {
/*
@ -332,13 +345,15 @@ static int mmci_pio_read(struct mmci_host *host, char *buffer, unsigned int rema
static int mmci_pio_write(struct mmci_host *host, char *buffer, unsigned int remain, u32 status)
{
struct variant_data *variant = host->variant;
void __iomem *base = host->base;
char *ptr = buffer;
do {
unsigned int count, maxcnt;
maxcnt = status & MCI_TXFIFOEMPTY ? MCI_FIFOSIZE : MCI_FIFOHALFSIZE;
maxcnt = status & MCI_TXFIFOEMPTY ?
variant->fifosize : variant->fifohalfsize;
count = min(remain, maxcnt);
writesl(base + MMCIFIFO, ptr, count >> 2);
@ -362,6 +377,7 @@ static irqreturn_t mmci_pio_irq(int irq, void *dev_id)
{
struct mmci_host *host = dev_id;
struct sg_mapping_iter *sg_miter = &host->sg_miter;
struct variant_data *variant = host->variant;
void __iomem *base = host->base;
unsigned long flags;
u32 status;
@ -420,7 +436,7 @@ static irqreturn_t mmci_pio_irq(int irq, void *dev_id)
* If we're nearing the end of the read, switch to
* "any data available" mode.
*/
if (status & MCI_RXACTIVE && host->size < MCI_FIFOSIZE)
if (status & MCI_RXACTIVE && host->size < variant->fifosize)
writel(MCI_RXDATAAVLBLMASK, base + MMCIMASK1);
/*

7
drivers/mmc/host/mmci.h
View File

@ -133,13 +133,6 @@
MCI_DATATIMEOUTMASK|MCI_TXUNDERRUNMASK|MCI_RXOVERRUNMASK| \
MCI_CMDRESPENDMASK|MCI_CMDSENTMASK|MCI_DATABLOCKENDMASK)
/*
* The size of the FIFO in bytes.
*/
#define MCI_FIFOSIZE (16*4)
#define MCI_FIFOHALFSIZE (MCI_FIFOSIZE / 2)
#define NR_SG 16
struct clk;