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spi: mpc8xx: Set up speed as requested

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Set the speed requested through mpc8xx_spi_set_speed() instead
of hardcoding a fixed speed.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
This commit is contained in:
Christophe Leroy 2024-04-12 19:36:19 +02:00
parent dff36805c7
commit 4fb931ed53
1 changed files with 17 additions and 2 deletions
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19
drivers/spi/mpc8xx_spi.c
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@ -48,6 +48,21 @@ static int mpc8xx_spi_set_mode(struct udevice *dev, uint mod)
static int mpc8xx_spi_set_speed(struct udevice *dev, uint speed)
{
immap_t __iomem *immr = (immap_t __iomem *)CONFIG_SYS_IMMR;
cpm8xx_t __iomem *cp = &immr->im_cpm;
u8 pm = (gd->arch.brg_clk - 1) / (speed * 16);
if (pm > 16) {
setbits_be16(&cp->cp_spmode, SPMODE_DIV16);
pm /= 16;
if (pm > 16)
pm = 16;
} else {
clrbits_be16(&cp->cp_spmode, SPMODE_DIV16);
}
clrsetbits_be16(&cp->cp_spmode, SPMODE_PM(0xf), SPMODE_PM(pm));
return 0;
}
@ -189,8 +204,8 @@ static int mpc8xx_spi_xfer_one(struct udevice *dev, size_t count,
out_be16(&rbdf->cbd_sc, BD_SC_EMPTY | BD_SC_WRAP);
out_be16(&rbdf->cbd_datlen, 0); /* rx length has no significance */
clrsetbits_be16(&cp->cp_spmode, ~SPMODE_LOOP, SPMODE_REV | SPMODE_MSTR |
SPMODE_EN | spmode_len | SPMODE_PM(0x8));
clrsetbits_be16(&cp->cp_spmode, ~(SPMODE_LOOP | SPMODE_PM(0xf) | SPMODE_DIV16),
SPMODE_REV | SPMODE_MSTR | SPMODE_EN | spmode_len);
out_8(&cp->cp_spim, 0); /* Mask all SPI events */
out_8(&cp->cp_spie, SPI_EMASK); /* Clear all SPI events */