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authorStefan Roese <sr@denx.de>2016-04-08 15:58:30 +0200
committerStefan Roese <sr@denx.de>2016-04-12 11:13:40 +0200
commit169a85501715d39f8a4af810e51df1300920fae9 (patch)
tree93a6cd86069099bbf55bd7175232bfa51b894403 /board
parent8ac71da94d63368136baf352e543ba9790db2610 (diff)
downloadtalos-obmc-uboot-169a85501715d39f8a4af810e51df1300920fae9.tar.gz
talos-obmc-uboot-169a85501715d39f8a4af810e51df1300920fae9.zip
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')
-rw-r--r--board/theadorable/theadorable.c69
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
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