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spi: cadence_qspi: support FIFO width other than 4 bytes

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This patch makes the code compatible with FIFO depths other than 4
bytes. It also simplify read/write FIFO loops.

Signed-off-by: Vikas Manocha <vikas.manocha@st.com>
Tested-by: Stefan Roese <sr@denx.de>
Reviewed-by: Jagannadh Teki <jteki@openedev.com>
This commit is contained in:
Vikas Manocha 2015-07-02 18:29:45 -07:00 committed by Jagan Teki
parent 90a2f71711
commit 70bb2b1415
1 changed files with 23 additions and 23 deletions
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46
drivers/spi/cadence_qspi_apb.c
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@ -200,18 +200,16 @@ static void cadence_qspi_apb_read_fifo_data(void *dest,
unsigned int *dest_ptr = (unsigned int *)dest;
unsigned int *src_ptr = (unsigned int *)src_ahb_addr;
while (remaining > 0) {
if (remaining >= CQSPI_FIFO_WIDTH) {
*dest_ptr = readl(src_ptr);
remaining -= CQSPI_FIFO_WIDTH;
} else {
/* dangling bytes */
temp = readl(src_ptr);
memcpy(dest_ptr, &temp, remaining);
break;
}
while (remaining >= sizeof(dest_ptr)) {
*dest_ptr = readl(src_ptr);
remaining -= sizeof(src_ptr);
dest_ptr++;
}
if (remaining) {
/* dangling bytes */
temp = readl(src_ptr);
memcpy(dest_ptr, &temp, remaining);
}
return;
}
@ -219,24 +217,26 @@ static void cadence_qspi_apb_read_fifo_data(void *dest,
static void cadence_qspi_apb_write_fifo_data(const void *dest_ahb_addr,
const void *src, unsigned int bytes)
{
unsigned int temp;
unsigned int temp = 0;
int i;
int remaining = bytes;
unsigned int *dest_ptr = (unsigned int *)dest_ahb_addr;
unsigned int *src_ptr = (unsigned int *)src;
while (remaining > 0) {
if (remaining >= CQSPI_FIFO_WIDTH) {
writel(*src_ptr, dest_ptr);
remaining -= sizeof(unsigned int);
} else {
/* dangling bytes */
memcpy(&temp, src_ptr, remaining);
writel(temp, dest_ptr);
break;
}
src_ptr++;
while (remaining >= CQSPI_FIFO_WIDTH) {
for (i = CQSPI_FIFO_WIDTH/sizeof(src_ptr) - 1; i >= 0; i--)
writel(*(src_ptr+i), dest_ptr+i);
src_ptr += CQSPI_FIFO_WIDTH/sizeof(src_ptr);
remaining -= CQSPI_FIFO_WIDTH;
}
if (remaining) {
/* dangling bytes */
i = remaining/sizeof(dest_ptr);
memcpy(&temp, src_ptr+i, remaining % sizeof(dest_ptr));
writel(temp, dest_ptr+i);
for (--i; i >= 0; i--)
writel(*(src_ptr+i), dest_ptr+i);
}
return;
}