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arm: mvebu: theadorable: Add PEX-switch detection and reset code

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Sometimes the PCIe link for the PEX-switch will not come-up. In this case,
the board is not in a usable state. This patch makes sure that in this
case a soft-reset is issued. If this soft-reset does not result in the
PEX-switch being detected after some soft-reset cycles, an I2C message
is sent to the uC to issue a complete power-cycle of the board.

Signed-off-by: Stefan Roese <sr@denx.de>
This commit is contained in:
Stefan Roese 2016-04-08 15:58:30 +02:00
parent 8ac71da94d
commit 169a855017
2 changed files with 70 additions and 0 deletions
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69
board/theadorable/theadorable.c
View file

@ -5,10 +5,13 @@
*/
#include <common.h>
#include <i2c.h>
#include <pci.h>
#include <asm/gpio.h>
#include <asm/io.h>
#include <asm/arch/cpu.h>
#include <asm/arch/soc.h>
#include <linux/crc8.h>
#include <linux/mbus.h>
#ifdef CONFIG_NET
#include <netdev.h>
@ -35,6 +38,12 @@ DECLARE_GLOBAL_DATA_PTR;
#define GPIO_USB0_PWR_ON 18
#define GPIO_USB1_PWR_ON 19
#define PEX_SWITCH_NOT_FOUNT_LIMIT 3
#define STM_I2C_BUS 1
#define STM_I2C_ADDR 0x27
#define REBOOT_DELAY 1000 /* reboot-delay in ms */
/* DDR3 static configuration */
static MV_DRAM_MC_INIT ddr3_theadorable[MV_MAX_DDR3_STATIC_SIZE] = {
{0x00001400, 0x7301ca28}, /* DDR SDRAM Configuration Register */
@ -214,3 +223,63 @@ int board_video_init(void)
return mvebu_lcd_register_init(&lcd_info);
}
#ifdef CONFIG_BOARD_LATE_INIT
int board_late_init(void)
{
pci_dev_t bdf;
ulong bootcount;
/*
* Check if the PEX switch is detected (somtimes its not available
* on the PCIe bus). In this case, try to recover by issuing a
* soft-reset or even a power-cycle, depending on the bootcounter
* value.
*/
bdf = pci_find_device(PCI_VENDOR_ID_PLX, 0x8619, 0);
if (bdf == -1) {
u8 i2c_buf[8];
int ret;
/* PEX switch not found! */
bootcount = bootcount_load();
printf("Failed to find PLX PEX-switch (bootcount=%ld)\n",
bootcount);
if (bootcount > PEX_SWITCH_NOT_FOUNT_LIMIT) {
printf("Issuing power-switch via uC!\n");
printf("Issuing power-switch via uC!\n");
i2c_set_bus_num(STM_I2C_BUS);
i2c_buf[0] = STM_I2C_ADDR << 1;
i2c_buf[1] = 0xc5; /* cmd */
i2c_buf[2] = 0x01; /* enable */
/* Delay before reboot */
i2c_buf[3] = REBOOT_DELAY & 0x00ff;
i2c_buf[4] = (REBOOT_DELAY & 0xff00) >> 8;
/* Delay before shutdown */
i2c_buf[5] = 0x00;
i2c_buf[6] = 0x00;
i2c_buf[7] = crc8(0x72, &i2c_buf[0], 7);
ret = i2c_write(STM_I2C_ADDR, 0, 0, &i2c_buf[1], 7);
if (ret) {
printf("I2C write error (ret=%d)\n", ret);
printf("Issuing soft-reset...\n");
/* default handling: SOFT reset */
do_reset(NULL, 0, 0, NULL);
}
/* Wait for power-cycle to occur... */
printf("Waiting for power-cycle via uC...\n");
while (1)
;
} else {
printf("Issuing soft-reset...\n");
/* default handling: SOFT reset */
do_reset(NULL, 0, 0, NULL);
}
}
return 0;
}
#endif

1
include/configs/theadorable.h
View file

@ -104,6 +104,7 @@
#define CONFIG_PCI
#define CONFIG_PCI_MVEBU
#define CONFIG_PCI_PNP
#define CONFIG_BOARD_LATE_INIT /* for PEX switch test */
#endif
#endif