diff options
| author | Stefan Roese <sr@denx.de> | 2016-04-08 15:58:30 +0200 |
|---|---|---|
| committer | Stefan Roese <sr@denx.de> | 2016-04-12 11:13:40 +0200 |
| commit | 169a85501715d39f8a4af810e51df1300920fae9 (patch) | |
| tree | 93a6cd86069099bbf55bd7175232bfa51b894403 /board/theadorable/theadorable.c | |
| parent | 8ac71da94d63368136baf352e543ba9790db2610 (diff) | |
arm: mvebu: theadorable: Add PEX-switch detection and reset code
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>
Diffstat (limited to 'board/theadorable/theadorable.c')
| -rw-r--r-- | board/theadorable/theadorable.c | 69 |
1 files changed, 69 insertions, 0 deletions
diff --git a/board/theadorable/theadorable.c b/board/theadorable/theadorable.c index 0756f186a6..b8b014838e 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 */ @@ -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 |