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 --- board/theadorable/theadorable.c | 69 +++++++++++++++++++++++++++++++++++++++++ include/configs/theadorable.h | 1 + 2 files changed, 70 insertions(+)
diff --git a/board/theadorable/theadorable.c b/board/theadorable/theadorable.c index 9c3b97c..5836bf7 100644 --- a/board/theadorable/theadorable.c +++ b/board/theadorable/theadorable.c @@ -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 */ @@ -218,3 +227,63 @@ 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 diff --git a/include/configs/theadorable.h b/include/configs/theadorable.h index 05a248e..5864f27 100644 --- a/include/configs/theadorable.h +++ b/include/configs/theadorable.h @@ -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