| yuezonghe | 824eb0c | 2024-06-27 02:32:26 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2011 Picochip Ltd., Jamie Iles |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License version 2 as |
| 6 | * published by the Free Software Foundation. |
| 7 | * |
| 8 | * All enquiries to support@picochip.com |
| 9 | */ |
| 10 | #include <linux/delay.h> |
| 11 | #include <linux/irq.h> |
| 12 | #include <linux/irqdomain.h> |
| 13 | #include <linux/of.h> |
| 14 | #include <linux/of_address.h> |
| 15 | #include <linux/of_irq.h> |
| 16 | #include <linux/of_platform.h> |
| 17 | |
| 18 | #include <asm/mach/arch.h> |
| 19 | #include <asm/hardware/vic.h> |
| 20 | #include <asm/mach/map.h> |
| 21 | |
| 22 | #include <mach/map.h> |
| 23 | #include <mach/picoxcell_soc.h> |
| 24 | |
| 25 | #include "common.h" |
| 26 | |
| 27 | #define WDT_CTRL_REG_EN_MASK (1 << 0) |
| 28 | #define WDT_CTRL_REG_OFFS (0x00) |
| 29 | #define WDT_TIMEOUT_REG_OFFS (0x04) |
| 30 | static void __iomem *wdt_regs; |
| 31 | |
| 32 | /* |
| 33 | * The machine restart method can be called from an atomic context so we won't |
| 34 | * be able to ioremap the regs then. |
| 35 | */ |
| 36 | static void picoxcell_setup_restart(void) |
| 37 | { |
| 38 | struct device_node *np = of_find_compatible_node(NULL, NULL, |
| 39 | "snps,dw-apb-wdg"); |
| 40 | if (WARN(!np, "unable to setup watchdog restart")) |
| 41 | return; |
| 42 | |
| 43 | wdt_regs = of_iomap(np, 0); |
| 44 | WARN(!wdt_regs, "failed to remap watchdog regs"); |
| 45 | } |
| 46 | |
| 47 | static struct map_desc io_map __initdata = { |
| 48 | .virtual = PHYS_TO_IO(PICOXCELL_PERIPH_BASE), |
| 49 | .pfn = __phys_to_pfn(PICOXCELL_PERIPH_BASE), |
| 50 | .length = PICOXCELL_PERIPH_LENGTH, |
| 51 | .type = MT_DEVICE, |
| 52 | }; |
| 53 | |
| 54 | static void __init picoxcell_map_io(void) |
| 55 | { |
| 56 | iotable_init(&io_map, 1); |
| 57 | } |
| 58 | |
| 59 | static void __init picoxcell_init_machine(void) |
| 60 | { |
| 61 | of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL); |
| 62 | picoxcell_setup_restart(); |
| 63 | } |
| 64 | |
| 65 | static const char *picoxcell_dt_match[] = { |
| 66 | "picochip,pc3x2", |
| 67 | "picochip,pc3x3", |
| 68 | NULL |
| 69 | }; |
| 70 | |
| 71 | static const struct of_device_id vic_of_match[] __initconst = { |
| 72 | { .compatible = "arm,pl192-vic", .data = vic_of_init, }, |
| 73 | { /* Sentinel */ } |
| 74 | }; |
| 75 | |
| 76 | static void __init picoxcell_init_irq(void) |
| 77 | { |
| 78 | of_irq_init(vic_of_match); |
| 79 | } |
| 80 | |
| 81 | static void picoxcell_wdt_restart(char mode, const char *cmd) |
| 82 | { |
| 83 | /* |
| 84 | * Configure the watchdog to reset with the shortest possible timeout |
| 85 | * and give it chance to do the reset. |
| 86 | */ |
| 87 | if (wdt_regs) { |
| 88 | writel_relaxed(WDT_CTRL_REG_EN_MASK, wdt_regs + WDT_CTRL_REG_OFFS); |
| 89 | writel_relaxed(0, wdt_regs + WDT_TIMEOUT_REG_OFFS); |
| 90 | /* No sleeping, possibly atomic. */ |
| 91 | mdelay(500); |
| 92 | } |
| 93 | } |
| 94 | |
| 95 | DT_MACHINE_START(PICOXCELL, "Picochip picoXcell") |
| 96 | .map_io = picoxcell_map_io, |
| 97 | .nr_irqs = NR_IRQS_LEGACY, |
| 98 | .init_irq = picoxcell_init_irq, |
| 99 | .handle_irq = vic_handle_irq, |
| 100 | .timer = &picoxcell_timer, |
| 101 | .init_machine = picoxcell_init_machine, |
| 102 | .dt_compat = picoxcell_dt_match, |
| 103 | .restart = picoxcell_wdt_restart, |
| 104 | MACHINE_END |