aoac.c

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/* SPDX-License-Identifier: GPL-2.0-only */
 
#include <stdint.h>
#include <amdblocks/acpimmio.h>
#include <amdblocks/aoac.h>
#include <soc/aoac_defs.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 CONFIG(AMD_SOC_CONSOLE_UART) && 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 unsigned int aoac_devs[] = {
        FCH_AOAC_DEV_AMBA,
        FCH_AOAC_DEV_I2C2,
        FCH_AOAC_DEV_I2C3,
        FCH_AOAC_DEV_I2C4,
        FCH_AOAC_DEV_ESPI,
};
 
void wait_for_aoac_enabled(unsigned int dev)
{
        while (!is_aoac_device_enabled(dev))
                udelay(100);
}
 
void enable_aoac_devices(void)
{
        unsigned int i;
 
        for (i = 0; i < ARRAY_SIZE(aoac_devs); i++)
                power_on_aoac_device(aoac_devs[i]);
 
        if (CONFIG(AMD_SOC_CONSOLE_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(AMD_SOC_CONSOLE_UART))
                wait_for_aoac_enabled(FCH_AOAC_UART_FOR_CONSOLE);
}