1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * R-Car Gen1 RESET/WDT, R-Car Gen2, Gen3, and RZ/G RST Driver 4 * 5 * Copyright (C) 2016 Glider bvba 6 */ 7 8 #include <linux/err.h> 9 #include <linux/io.h> 10 #include <linux/of_address.h> 11 #include <linux/soc/renesas/rcar-rst.h> 12 13 #define WDTRSTCR_RESET 0xA55A0002 14 #define WDTRSTCR 0x0054 15 16 #define CR7BAR 0x0070 17 #define CR7BAREN BIT(4) 18 #define CR7BAR_MASK 0xFFFC0000 19 20 static void __iomem *rcar_rst_base; 21 static u32 saved_mode __initdata; 22 static int (*rcar_rst_set_rproc_boot_addr_func)(u64 boot_addr); 23 24 static int rcar_rst_enable_wdt_reset(void __iomem *base) 25 { 26 iowrite32(WDTRSTCR_RESET, base + WDTRSTCR); 27 return 0; 28 } 29 30 /* 31 * Most of the R-Car Gen3 SoCs have an ARM Realtime Core. 32 * Firmware boot address has to be set in CR7BAR before 33 * starting the realtime core. 34 * Boot address must be aligned on a 256k boundary. 35 */ 36 static int rcar_rst_set_gen3_rproc_boot_addr(u64 boot_addr) 37 { 38 if (boot_addr & ~(u64)CR7BAR_MASK) { 39 pr_err("Invalid boot address got %llx\n", boot_addr); 40 return -EINVAL; 41 } 42 43 iowrite32(boot_addr, rcar_rst_base + CR7BAR); 44 iowrite32(boot_addr | CR7BAREN, rcar_rst_base + CR7BAR); 45 46 return 0; 47 } 48 49 struct rst_config { 50 unsigned int modemr; /* Mode Monitoring Register Offset */ 51 int (*configure)(void __iomem *base); /* Platform specific config */ 52 int (*set_rproc_boot_addr)(u64 boot_addr); 53 }; 54 55 static const struct rst_config rcar_rst_gen1 __initconst = { 56 .modemr = 0x20, 57 }; 58 59 static const struct rst_config rcar_rst_gen2 __initconst = { 60 .modemr = 0x60, 61 .configure = rcar_rst_enable_wdt_reset, 62 }; 63 64 static const struct rst_config rcar_rst_gen3 __initconst = { 65 .modemr = 0x60, 66 .set_rproc_boot_addr = rcar_rst_set_gen3_rproc_boot_addr, 67 }; 68 69 static const struct rst_config rcar_rst_gen4 __initconst = { 70 .modemr = 0x00, /* MODEMR0 and it has CPG related bits */ 71 }; 72 73 static const struct of_device_id rcar_rst_matches[] __initconst = { 74 /* RZ/G1 is handled like R-Car Gen2 */ 75 { .compatible = "renesas,r8a7742-rst", .data = &rcar_rst_gen2 }, 76 { .compatible = "renesas,r8a7743-rst", .data = &rcar_rst_gen2 }, 77 { .compatible = "renesas,r8a7744-rst", .data = &rcar_rst_gen2 }, 78 { .compatible = "renesas,r8a7745-rst", .data = &rcar_rst_gen2 }, 79 { .compatible = "renesas,r8a77470-rst", .data = &rcar_rst_gen2 }, 80 /* RZ/G2 is handled like R-Car Gen3 */ 81 { .compatible = "renesas,r8a774a1-rst", .data = &rcar_rst_gen3 }, 82 { .compatible = "renesas,r8a774b1-rst", .data = &rcar_rst_gen3 }, 83 { .compatible = "renesas,r8a774c0-rst", .data = &rcar_rst_gen3 }, 84 { .compatible = "renesas,r8a774e1-rst", .data = &rcar_rst_gen3 }, 85 /* R-Car Gen1 */ 86 { .compatible = "renesas,r8a7778-reset-wdt", .data = &rcar_rst_gen1 }, 87 { .compatible = "renesas,r8a7779-reset-wdt", .data = &rcar_rst_gen1 }, 88 /* R-Car Gen2 */ 89 { .compatible = "renesas,r8a7790-rst", .data = &rcar_rst_gen2 }, 90 { .compatible = "renesas,r8a7791-rst", .data = &rcar_rst_gen2 }, 91 { .compatible = "renesas,r8a7792-rst", .data = &rcar_rst_gen2 }, 92 { .compatible = "renesas,r8a7793-rst", .data = &rcar_rst_gen2 }, 93 { .compatible = "renesas,r8a7794-rst", .data = &rcar_rst_gen2 }, 94 /* R-Car Gen3 */ 95 { .compatible = "renesas,r8a7795-rst", .data = &rcar_rst_gen3 }, 96 { .compatible = "renesas,r8a7796-rst", .data = &rcar_rst_gen3 }, 97 { .compatible = "renesas,r8a77961-rst", .data = &rcar_rst_gen3 }, 98 { .compatible = "renesas,r8a77965-rst", .data = &rcar_rst_gen3 }, 99 { .compatible = "renesas,r8a77970-rst", .data = &rcar_rst_gen3 }, 100 { .compatible = "renesas,r8a77980-rst", .data = &rcar_rst_gen3 }, 101 { .compatible = "renesas,r8a77990-rst", .data = &rcar_rst_gen3 }, 102 { .compatible = "renesas,r8a77995-rst", .data = &rcar_rst_gen3 }, 103 /* R-Car Gen4 */ 104 { .compatible = "renesas,r8a779a0-rst", .data = &rcar_rst_gen4 }, 105 { .compatible = "renesas,r8a779f0-rst", .data = &rcar_rst_gen4 }, 106 { /* sentinel */ } 107 }; 108 109 static int __init rcar_rst_init(void) 110 { 111 const struct of_device_id *match; 112 const struct rst_config *cfg; 113 struct device_node *np; 114 void __iomem *base; 115 int error = 0; 116 117 np = of_find_matching_node_and_match(NULL, rcar_rst_matches, &match); 118 if (!np) 119 return -ENODEV; 120 121 base = of_iomap(np, 0); 122 if (!base) { 123 pr_warn("%pOF: Cannot map regs\n", np); 124 error = -ENOMEM; 125 goto out_put; 126 } 127 128 rcar_rst_base = base; 129 cfg = match->data; 130 rcar_rst_set_rproc_boot_addr_func = cfg->set_rproc_boot_addr; 131 132 saved_mode = ioread32(base + cfg->modemr); 133 if (cfg->configure) { 134 error = cfg->configure(base); 135 if (error) { 136 pr_warn("%pOF: Cannot run SoC specific configuration\n", 137 np); 138 goto out_put; 139 } 140 } 141 142 pr_debug("%pOF: MODE = 0x%08x\n", np, saved_mode); 143 144 out_put: 145 of_node_put(np); 146 return error; 147 } 148 149 int __init rcar_rst_read_mode_pins(u32 *mode) 150 { 151 int error; 152 153 if (!rcar_rst_base) { 154 error = rcar_rst_init(); 155 if (error) 156 return error; 157 } 158 159 *mode = saved_mode; 160 return 0; 161 } 162 163 int rcar_rst_set_rproc_boot_addr(u64 boot_addr) 164 { 165 if (!rcar_rst_set_rproc_boot_addr_func) 166 return -EIO; 167 168 return rcar_rst_set_rproc_boot_addr_func(boot_addr); 169 } 170 EXPORT_SYMBOL_GPL(rcar_rst_set_rproc_boot_addr); 171