On some ocelots platform a workaround is needed in order to be able to reset the switch without resetting the DDR.
Signed-off-by: Gregory CLEMENT gregory.clement@bootlin.com --- board/mscc/ocelot/ocelot.c | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+)
diff --git a/board/mscc/ocelot/ocelot.c b/board/mscc/ocelot/ocelot.c index 0f7a532158..88f59e8044 100644 --- a/board/mscc/ocelot/ocelot.c +++ b/board/mscc/ocelot/ocelot.c @@ -18,6 +18,34 @@ enum { BOARD_TYPE_PCB123, };
+void mscc_switch_reset(bool enter) +{ + u32 reg, count = 0; + + /* Nasty workaround to avoid GPIO19 (DDR!) being reset */ + mscc_gpio_set_alternate(19, 2); + + printf("applying SwC reset\n"); + + writel(ICPU_RESET_CORE_RST_PROTECT, BASE_CFG + ICPU_RESET); + writel(PERF_SOFT_RST_SOFT_CHIP_RST, BASE_DEVCPU_GCB + PERF_SOFT_RST); + + do { + reg = readl(BASE_DEVCPU_GCB + PERF_SOFT_RST); + count++; + } while (reg & PERF_SOFT_RST_SOFT_CHIP_RST); + + printf("SwC reset done - reg = 0x%08x, count %u\n", reg, count); + + /* + * Reset GPIO19 mode back as regular GPIO, output, high (DDR + * not reset) (Order is important) + */ + setbits_le32(BASE_DEVCPU_GCB + PERF_GPIO_OE, BIT(19)); + writel(BIT(19), BASE_DEVCPU_GCB + PERF_GPIO_OUT_SET); + mscc_gpio_set_alternate(19, 0); +} + void board_debug_uart_init(void) { /* too early for the pinctrl driver, so configure the UART pins here */