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81 lines
2.0 KiB
81 lines
2.0 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Copyright (c) 2011 Picochip Ltd., Jamie Iles |
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* |
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* All enquiries to [email protected] |
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*/ |
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#include <linux/delay.h> |
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#include <linux/of.h> |
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#include <linux/of_address.h> |
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#include <linux/reboot.h> |
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#include <asm/mach/arch.h> |
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#include <asm/mach/map.h> |
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#define PHYS_TO_IO(x) (((x) & 0x00ffffff) | 0xfe000000) |
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#define PICOXCELL_PERIPH_BASE 0x80000000 |
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#define PICOXCELL_PERIPH_LENGTH SZ_4M |
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#define WDT_CTRL_REG_EN_MASK (1 << 0) |
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#define WDT_CTRL_REG_OFFS (0x00) |
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#define WDT_TIMEOUT_REG_OFFS (0x04) |
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static void __iomem *wdt_regs; |
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/* |
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* The machine restart method can be called from an atomic context so we won't |
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* be able to ioremap the regs then. |
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*/ |
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static void picoxcell_setup_restart(void) |
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{ |
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struct device_node *np = of_find_compatible_node(NULL, NULL, |
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"snps,dw-apb-wdg"); |
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if (WARN(!np, "unable to setup watchdog restart")) |
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return; |
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wdt_regs = of_iomap(np, 0); |
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WARN(!wdt_regs, "failed to remap watchdog regs"); |
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} |
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static struct map_desc io_map __initdata = { |
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.virtual = PHYS_TO_IO(PICOXCELL_PERIPH_BASE), |
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.pfn = __phys_to_pfn(PICOXCELL_PERIPH_BASE), |
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.length = PICOXCELL_PERIPH_LENGTH, |
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.type = MT_DEVICE, |
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}; |
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static void __init picoxcell_map_io(void) |
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{ |
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iotable_init(&io_map, 1); |
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} |
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static void __init picoxcell_init_machine(void) |
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{ |
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picoxcell_setup_restart(); |
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} |
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static const char *picoxcell_dt_match[] = { |
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"picochip,pc3x2", |
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"picochip,pc3x3", |
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NULL |
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}; |
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static void picoxcell_wdt_restart(enum reboot_mode mode, const char *cmd) |
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{ |
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/* |
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* Configure the watchdog to reset with the shortest possible timeout |
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* and give it chance to do the reset. |
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*/ |
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if (wdt_regs) { |
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writel_relaxed(WDT_CTRL_REG_EN_MASK, wdt_regs + WDT_CTRL_REG_OFFS); |
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writel_relaxed(0, wdt_regs + WDT_TIMEOUT_REG_OFFS); |
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/* No sleeping, possibly atomic. */ |
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mdelay(500); |
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} |
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} |
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DT_MACHINE_START(PICOXCELL, "Picochip picoXcell") |
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.map_io = picoxcell_map_io, |
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.init_machine = picoxcell_init_machine, |
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.dt_compat = picoxcell_dt_match, |
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.restart = picoxcell_wdt_restart, |
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MACHINE_END
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