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sd-as3525v2: use an uncached buffer, disable write for the moment

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@24858 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Rafaël Carré 2010-02-22 10:02:20 +00:00
parent 0880349fa8
commit 355f38d30a
1 changed files with 32 additions and 10 deletions
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42
firmware/target/arm/as3525/sd-as3525v2.c
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@ -175,6 +175,10 @@
#define MCI_FIFO ((unsigned long *) (SD_BASE+0x100))
#define UNALIGNED_NUM_SECTORS 10
static unsigned char aligned_buffer[UNALIGNED_NUM_SECTORS* SD_BLOCK_SIZE] __attribute__((aligned(32))); /* align on cache line size */
static unsigned char *uncached_buffer = UNCACHED_ADDR(&aligned_buffer[0]);
static int sd_init_card(void);
static void init_controller(void);
@ -404,14 +408,14 @@ static void init_controller(void)
int idx = (MCI_HCON >> 1) & 31;
int idx_bits = (1 << idx) -1;
MCI_CLKSRC = 0;
MCI_CLKDIV = 0;
MCI_PWREN &= ~idx_bits;
MCI_PWREN = idx_bits;
mci_delay();
MCI_CLKSRC = 0;
MCI_CLKDIV = 0;
MCI_CTRL |= CTRL_RESET;
while(MCI_CTRL & CTRL_RESET)
;
@ -563,12 +567,20 @@ static int sd_transfer_sectors(unsigned long start, int count, void* buf, bool w
const int cmd = write ? SD_WRITE_MULTIPLE_BLOCK : SD_READ_MULTIPLE_BLOCK;
/* Interrupt handler might set this to true during transfer */
retry = false;
do
{
void *dma_buf = aligned_buffer;
unsigned int transfer = count;
if(transfer > UNALIGNED_NUM_SECTORS)
transfer = UNALIGNED_NUM_SECTORS;
if(write)
memcpy(uncached_buffer, buf, transfer * SD_BLOCK_SIZE);
retry = false;
MCI_BLKSIZ = SD_BLOCK_SIZE;
MCI_BYTCNT = count * SD_BLOCK_SIZE;
MCI_BYTCNT = transfer * SD_BLOCK_SIZE;
MCI_CTRL |= (FIFO_RESET|DMA_RESET);
while(MCI_CTRL & (FIFO_RESET|DMA_RESET))
@ -592,10 +604,10 @@ static int sd_transfer_sectors(unsigned long start, int count, void* buf, bool w
panicf("transfer multiple blocks failed (%d)", ret);
if(write)
dma_enable_channel(0, buf, MCI_FIFO, DMA_PERI_SD,
dma_enable_channel(0, dma_buf, MCI_FIFO, DMA_PERI_SD,
DMAC_FLOWCTRL_PERI_MEM_TO_PERI, true, false, 0, DMA_S8, NULL);
else
dma_enable_channel(0, MCI_FIFO, buf, DMA_PERI_SD,
dma_enable_channel(0, MCI_FIFO, dma_buf, DMA_PERI_SD,
DMAC_FLOWCTRL_PERI_PERI_TO_MEM, false, true, 0, DMA_S8, NULL);
data_transfer = true;
@ -617,7 +629,16 @@ static int sd_transfer_sectors(unsigned long start, int count, void* buf, bool w
panicf(" wait for state TRAN failed (%d)", ret);
goto sd_transfer_error;
}
} while(retry);
if(!retry)
{
if(!write)
memcpy(buf, uncached_buffer, transfer * SD_BLOCK_SIZE);
buf += transfer * SD_BLOCK_SIZE;
start += transfer;
count -= transfer;
}
} while(retry || count);
dma_release();
@ -640,7 +661,8 @@ int sd_read_sectors(unsigned long start, int count, void* buf)
int sd_write_sectors(unsigned long start, int count, const void* buf)
{
#if defined(BOOTLOADER) /* we don't need write support in bootloader */
#if 1 /* disabled until stable*/ \
|| defined(BOOTLOADER) /* we don't need write support in bootloader */
(void) start;
(void) count;
(void) buf;