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bfin_spi: add spi_set_speed

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The new speed will be applied by spi_claim_bus.

Signed-off-by: Thomas Chou <thomas@wytron.com.tw>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
This commit is contained in:
Thomas Chou 2010-12-24 15:16:08 +08:00 committed by Mike Frysinger
parent fa1423e707
commit 6c3eb43a0f
1 changed files with 19 additions and 13 deletions
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32
drivers/spi/bfin_spi.c
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@ -138,13 +138,29 @@ static const unsigned short cs_pins[][7] = {
#endif
};
void spi_set_speed(struct spi_slave *slave, uint hz)
{
struct bfin_spi_slave *bss = to_bfin_spi_slave(slave);
ulong sclk;
u32 baud;
sclk = get_sclk();
baud = sclk / (2 * hz);
/* baud should be rounded up */
if (sclk % (2 * hz))
baud += 1;
if (baud < 2)
baud = 2;
else if (baud > (u16)-1)
baud = -1;
bss->baud = baud;
}
struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs,
unsigned int max_hz, unsigned int mode)
{
struct bfin_spi_slave *bss;
ulong sclk;
u32 mmr_base;
u32 baud;
if (!spi_cs_is_valid(bus, cs))
return NULL;
@ -166,16 +182,6 @@ struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs,
default: return NULL;
}
sclk = get_sclk();
baud = sclk / (2 * max_hz);
/* baud should be rounded up */
if (sclk % (2 * max_hz))
baud += 1;
if (baud < 2)
baud = 2;
else if (baud > (u16)-1)
baud = -1;
bss = malloc(sizeof(*bss));
if (!bss)
return NULL;
@ -187,8 +193,8 @@ struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs,
if (mode & SPI_CPHA) bss->ctl |= CPHA;
if (mode & SPI_CPOL) bss->ctl |= CPOL;
if (mode & SPI_LSB_FIRST) bss->ctl |= LSBF;
bss->baud = baud;
bss->flg = mode & SPI_CS_HIGH ? 1 : 0;
spi_set_speed(&bss->slave, max_hz);
debug("%s: bus:%i cs:%i mmr:%x ctl:%x baud:%i flg:%i\n", __func__,
bus, cs, mmr_base, bss->ctl, baud, bss->flg);