| /* 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; |
| byte &= ~FCH_AOAC_TARGET_DEVICE_STATE; |
| byte |= FCH_AOAC_D0_INITIALIZED; |
| 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; |
| } |
| |
| void wait_for_aoac_enabled(int dev) |
| { |
| while (!is_aoac_device_enabled(dev)) |
| udelay(100); |
| } |
| |
| void enable_aoac_devices(void) |
| { |
| int i; |
| |
| for (i = 0; i < ARRAY_SIZE(aoac_devs); i++) |
| power_on_aoac_device(aoac_devs[i]); |
| |
| if (CONFIG(PICASSO_UART)) |
| power_on_aoac_device(FCH_AOAC_UART_FOR_CONSOLE); |
| |
| /* Wait for AOAC devices to indicate power and clock OK */ |
| for (i = 0; i < ARRAY_SIZE(aoac_devs); i++) |
| wait_for_aoac_enabled(aoac_devs[i]); |
| |
| if (CONFIG(PICASSO_UART)) |
| wait_for_aoac_enabled(FCH_AOAC_UART_FOR_CONSOLE); |
| } |