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tegra124: Allow enabling clock output for external peripherals.

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Some peripherals, like audio codecs, need clock outputs from Tegra chip.
The new clock_external_output(clk_id) allows enabling any of the three clock
outputs.

BUG=none
TEST=emerge-nyan chromeos-coreboot-nyan
BRANCH=none

Change-Id: I05a1ffb80077d3b14751bfa0e7c47d541a103a08
Signed-off-by: Hung-Te Lin <hungte@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/176108
Reviewed-by: Gabe Black <gabeblack@chromium.org>
Reviewed-by: David Hendricks <dhendrix@chromium.org>
This commit is contained in:
Hung-Te Lin 2013-11-08 17:38:38 +08:00 • committed by chrome-internal-fetch
commit ea9fb6393e
2 changed files with 21 additions and 0 deletions
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20
src/soc/nvidia/tegra124/clock.c
View file

@ -305,6 +305,26 @@ void clock_early_uart(void)
clrbits_le32(&clk_rst->rst_dev_l, CLK_L_UARTA);
}
/* Enable output clock (CLK1~3) for external peripherals. */
void clock_external_output(int clk_id)
{
switch (clk_id) {
case 1:
setbits_le32(&pmc->clk_out_cntrl, 1 << 2);
break;
case 2:
setbits_le32(&pmc->clk_out_cntrl, 1 << 10);
break;
case 3:
setbits_le32(&pmc->clk_out_cntrl, 1 << 18);
break;
default:
printk(BIOS_CRIT, "ERROR: Unknown output clock id %d\n",
clk_id);
break;
}
}
void clock_cpu0_config_and_reset(void *entry)
{
void * const evp_cpu_reset = (uint8_t *)TEGRA_EVP_BASE + 0x100;

1
src/soc/nvidia/tegra124/include/soc/clock.h
View file

@ -239,6 +239,7 @@ enum clock_source { /* Careful: Not true for all sources, always check TRM! */
int clock_get_osc_khz(void);
void clock_early_uart(void);
void clock_external_output(int clk_id);
void clock_cpu0_config_and_reset(void * entry);
void clock_enable_clear_reset(u32 l, u32 h, u32 u, u32 v, u32 w, u32 x);
void clock_init(void);