src/soc/amd/mendocino/aoac.c

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2
   3 #include <stdint.h>
   4 #include <amdblocks/acpimmio.h>
   5 #include <amdblocks/aoac.h>
   6 #include <soc/aoac_defs.h>
   7 #include <soc/southbridge.h>
   8 #include <delay.h>
   9
  10 #define FCH_AOAC_UART_FOR_CONSOLE \
  11                 (CONFIG_UART_FOR_CONSOLE == 0 ? FCH_AOAC_DEV_UART0 \
  12                 : CONFIG_UART_FOR_CONSOLE == 1 ? FCH_AOAC_DEV_UART1 \
  13                 : CONFIG_UART_FOR_CONSOLE == 2 ? FCH_AOAC_DEV_UART2 \
  14                 : CONFIG_UART_FOR_CONSOLE == 3 ? FCH_AOAC_DEV_UART3 \
  15                 : CONFIG_UART_FOR_CONSOLE == 4 ? FCH_AOAC_DEV_UART4 \
  16                 : -1)
  17 #if CONFIG(AMD_SOC_CONSOLE_UART) && FCH_AOAC_UART_FOR_CONSOLE == -1
  18 # error Unsupported UART_FOR_CONSOLE chosen
  19 #endif
  20
  21 /*
  22  * Table of devices that need their AOAC registers enabled and waited
  23  * upon (usually about .55 milliseconds). Instead of individual delays
  24  * waiting for each device to become available, a single delay will be
  25  * executed.  The console UART is handled separately from this table.
  26  *
  27  * TODO: Find out which I2C controllers we really need to enable here.
  28  */
  29 static const unsigned int aoac_devs[] = {
  30         FCH_AOAC_DEV_AMBA,
  31         FCH_AOAC_DEV_I2C0,
  32         FCH_AOAC_DEV_I2C1,
  33         FCH_AOAC_DEV_I2C2,
  34         FCH_AOAC_DEV_I2C3,
  35         FCH_AOAC_DEV_ESPI,
  36 };
  37
  38 void wait_for_aoac_enabled(unsigned int dev)
  39 {
  40         while (!is_aoac_device_enabled(dev))
  41                 udelay(100);
  42 }
  43
  44 void enable_aoac_devices(void)
  45 {
  46         unsigned int i;
  47
  48         for (i = 0; i < ARRAY_SIZE(aoac_devs); i++)
  49                 power_on_aoac_device(aoac_devs[i]);
  50
  51         if (CONFIG(AMD_SOC_CONSOLE_UART))
  52                 power_on_aoac_device(FCH_AOAC_UART_FOR_CONSOLE);
  53
  54         /* Wait for AOAC devices to indicate power and clock OK */
  55         for (i = 0; i < ARRAY_SIZE(aoac_devs); i++)
  56                 wait_for_aoac_enabled(aoac_devs[i]);
  57
  58         if (CONFIG(AMD_SOC_CONSOLE_UART))
  59                 wait_for_aoac_enabled(FCH_AOAC_UART_FOR_CONSOLE);
  60 }