diff options
author | Raul E Rangel <rrangel@chromium.org> | 2020-06-11 14:06:11 -0600 |
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committer | Patrick Georgi <pgeorgi@google.com> | 2020-06-14 16:53:20 +0000 |
commit | d53c281d0beeabcfafd4b2682fbd0c01ae88ac10 (patch) | |
tree | 4747adbb7b45b68efe5556e2273b5b2283d172dc /src/soc/amd/picasso/aoac.c | |
parent | 4f5936b45652cea97f964678c93083b0a4f2e478 (diff) |
soc/amd/picasso: Move aoac functions to new file
This functionality is needed in the PSP and I can't include all of
southbridge.c.
BUG=b:153001807
TEST=Made sure trembyle still compiles
Signed-off-by: Raul E Rangel <rrangel@chromium.org>
Change-Id: I3a38c655588d7836e1bd033e958a505774de871e
Reviewed-on: https://review.coreboot.org/c/coreboot/+/42324
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Diffstat (limited to 'src/soc/amd/picasso/aoac.c')
-rw-r--r-- | src/soc/amd/picasso/aoac.c | 97 |
1 files changed, 97 insertions, 0 deletions
diff --git a/src/soc/amd/picasso/aoac.c b/src/soc/amd/picasso/aoac.c new file mode 100644 index 0000000000..35adc24723 --- /dev/null +++ b/src/soc/amd/picasso/aoac.c @@ -0,0 +1,97 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ + +#include <stdint.h> +#include <amdblocks/acpimmio.h> +#include <soc/southbridge.h> +#include <delay.h> + +#define FCH_AOAC_UART_FOR_CONSOLE \ + (CONFIG_UART_FOR_CONSOLE == 0 ? FCH_AOAC_DEV_UART0 \ + : CONFIG_UART_FOR_CONSOLE == 1 ? FCH_AOAC_DEV_UART1 \ + : CONFIG_UART_FOR_CONSOLE == 2 ? FCH_AOAC_DEV_UART2 \ + : CONFIG_UART_FOR_CONSOLE == 3 ? FCH_AOAC_DEV_UART3 \ + : -1) +#if FCH_AOAC_UART_FOR_CONSOLE == -1 +# error Unsupported UART_FOR_CONSOLE chosen +#endif + +/* + * Table of devices that need their AOAC registers enabled and waited + * upon (usually about .55 milliseconds). Instead of individual delays + * waiting for each device to become available, a single delay will be + * executed. The console UART is handled separately from this table. + */ +const static int aoac_devs[] = { + FCH_AOAC_DEV_AMBA, + FCH_AOAC_DEV_I2C2, + FCH_AOAC_DEV_I2C3, + FCH_AOAC_DEV_I2C4, + FCH_AOAC_DEV_ESPI, +}; + +void power_on_aoac_device(int dev) +{ + uint8_t byte; + + /* Power on the UART and AMBA devices */ + byte = aoac_read8(AOAC_DEV_D3_CTL(dev)); + byte |= FCH_AOAC_PWR_ON_DEV; + aoac_write8(AOAC_DEV_D3_CTL(dev), byte); +} + +void power_off_aoac_device(int dev) +{ + uint8_t byte; + + /* Power on the UART and AMBA devices */ + byte = aoac_read8(AOAC_DEV_D3_CTL(dev)); + byte &= ~FCH_AOAC_PWR_ON_DEV; + aoac_write8(AOAC_DEV_D3_CTL(dev), byte); +} + +bool is_aoac_device_enabled(int dev) +{ + uint8_t byte; + + byte = aoac_read8(AOAC_DEV_D3_STATE(dev)); + byte &= (FCH_AOAC_PWR_RST_STATE | FCH_AOAC_RST_CLK_OK_STATE); + if (byte == (FCH_AOAC_PWR_RST_STATE | FCH_AOAC_RST_CLK_OK_STATE)) + return true; + else + return false; +} + +static void enable_aoac_console_uart(void) +{ + if (!CONFIG(PICASSO_UART)) + return; + + power_on_aoac_device(FCH_AOAC_UART_FOR_CONSOLE); +} + +static bool is_aoac_console_uart_enabled(void) +{ + if (!CONFIG(PICASSO_UART)) + return true; + + return is_aoac_device_enabled(FCH_AOAC_UART_FOR_CONSOLE); +} + +void enable_aoac_devices(void) +{ + bool status; + int i; + + for (i = 0; i < ARRAY_SIZE(aoac_devs); i++) + power_on_aoac_device(aoac_devs[i]); + enable_aoac_console_uart(); + + /* Wait for AOAC devices to indicate power and clock OK */ + do { + udelay(100); + status = true; + for (i = 0; i < ARRAY_SIZE(aoac_devs); i++) + status &= is_aoac_device_enabled(aoac_devs[i]); + status &= is_aoac_console_uart_enabled(); + } while (!status); +} |