Gaku Inami | a8caad6 | 2015-03-16 14:48:43 +0900 | [diff] [blame] | 1 | /* |
| 2 | * R-Car Generation 2 Power management support |
| 3 | * |
| 4 | * Copyright (C) 2013 - 2015 Renesas Electronics Corporation |
| 5 | * Copyright (C) 2011 Renesas Solutions Corp. |
| 6 | * Copyright (C) 2011 Magnus Damm |
| 7 | * |
| 8 | * This file is subject to the terms and conditions of the GNU General Public |
| 9 | * License. See the file "COPYING" in the main directory of this archive |
| 10 | * for more details. |
| 11 | */ |
| 12 | |
| 13 | #include <linux/kernel.h> |
Geert Uytterhoeven | 8167569 | 2017-07-04 17:41:36 +0200 | [diff] [blame] | 14 | #include <linux/ioport.h> |
Gaku Inami | a8caad6 | 2015-03-16 14:48:43 +0900 | [diff] [blame] | 15 | #include <linux/of.h> |
Geert Uytterhoeven | 8167569 | 2017-07-04 17:41:36 +0200 | [diff] [blame] | 16 | #include <linux/of_address.h> |
Gaku Inami | a8caad6 | 2015-03-16 14:48:43 +0900 | [diff] [blame] | 17 | #include <linux/smp.h> |
Geert Uytterhoeven | be32bcb | 2016-04-20 14:02:36 +0200 | [diff] [blame] | 18 | #include <linux/soc/renesas/rcar-sysc.h> |
Gaku Inami | a8caad6 | 2015-03-16 14:48:43 +0900 | [diff] [blame] | 19 | #include <asm/io.h> |
| 20 | #include "common.h" |
Gaku Inami | a8caad6 | 2015-03-16 14:48:43 +0900 | [diff] [blame] | 21 | #include "rcar-gen2.h" |
| 22 | |
| 23 | /* RST */ |
| 24 | #define RST 0xe6160000 |
Geert Uytterhoeven | aa7f39d | 2017-01-25 10:02:13 +0100 | [diff] [blame] | 25 | |
| 26 | #define CA15BAR 0x0020 /* CA15 Boot Address Register */ |
| 27 | #define CA7BAR 0x0030 /* CA7 Boot Address Register */ |
| 28 | #define CA15RESCNT 0x0040 /* CA15 Reset Control Register */ |
| 29 | #define CA7RESCNT 0x0044 /* CA7 Reset Control Register */ |
| 30 | |
| 31 | /* SYS Boot Address Register */ |
| 32 | #define SBAR_BAREN BIT(4) /* SBAR is valid */ |
| 33 | |
| 34 | /* Reset Control Registers */ |
| 35 | #define CA15RESCNT_CODE 0xa5a50000 |
| 36 | #define CA15RESCNT_CPUS 0xf /* CPU0-3 */ |
| 37 | #define CA7RESCNT_CODE 0x5a5a0000 |
| 38 | #define CA7RESCNT_CPUS 0xf /* CPU0-3 */ |
| 39 | |
Gaku Inami | a8caad6 | 2015-03-16 14:48:43 +0900 | [diff] [blame] | 40 | |
| 41 | /* On-chip RAM */ |
Geert Uytterhoeven | c94bc81 | 2016-05-17 17:15:33 +0200 | [diff] [blame] | 42 | #define ICRAM1 0xe63c0000 /* Inter Connect RAM1 (4 KiB) */ |
Gaku Inami | a8caad6 | 2015-03-16 14:48:43 +0900 | [diff] [blame] | 43 | |
Geert Uytterhoeven | aa7f39d | 2017-01-25 10:02:13 +0100 | [diff] [blame] | 44 | static inline u32 phys_to_sbar(phys_addr_t addr) |
| 45 | { |
| 46 | return (addr >> 8) & 0xfffffc00; |
| 47 | } |
| 48 | |
Gaku Inami | a8caad6 | 2015-03-16 14:48:43 +0900 | [diff] [blame] | 49 | /* SYSC */ |
| 50 | #define SYSCIER 0x0c |
| 51 | #define SYSCIMR 0x10 |
| 52 | |
| 53 | #if defined(CONFIG_SMP) |
| 54 | |
| 55 | static void __init rcar_gen2_sysc_init(u32 syscier) |
| 56 | { |
Geert Uytterhoeven | 0532399 | 2016-06-28 16:10:33 +0200 | [diff] [blame] | 57 | rcar_sysc_init(0xe6180000, syscier); |
Gaku Inami | a8caad6 | 2015-03-16 14:48:43 +0900 | [diff] [blame] | 58 | } |
| 59 | |
| 60 | #else /* CONFIG_SMP */ |
| 61 | |
| 62 | static inline void rcar_gen2_sysc_init(u32 syscier) {} |
| 63 | |
| 64 | #endif /* CONFIG_SMP */ |
| 65 | |
| 66 | void __init rcar_gen2_pm_init(void) |
| 67 | { |
| 68 | void __iomem *p; |
| 69 | u32 bar; |
| 70 | static int once; |
| 71 | struct device_node *np, *cpus; |
| 72 | bool has_a7 = false; |
| 73 | bool has_a15 = false; |
Geert Uytterhoeven | 8167569 | 2017-07-04 17:41:36 +0200 | [diff] [blame] | 74 | struct resource res; |
Gaku Inami | a8caad6 | 2015-03-16 14:48:43 +0900 | [diff] [blame] | 75 | u32 syscier = 0; |
Geert Uytterhoeven | 8167569 | 2017-07-04 17:41:36 +0200 | [diff] [blame] | 76 | int error; |
Gaku Inami | a8caad6 | 2015-03-16 14:48:43 +0900 | [diff] [blame] | 77 | |
| 78 | if (once++) |
| 79 | return; |
| 80 | |
| 81 | cpus = of_find_node_by_path("/cpus"); |
| 82 | if (!cpus) |
| 83 | return; |
| 84 | |
| 85 | for_each_child_of_node(cpus, np) { |
| 86 | if (of_device_is_compatible(np, "arm,cortex-a15")) |
| 87 | has_a15 = true; |
| 88 | else if (of_device_is_compatible(np, "arm,cortex-a7")) |
| 89 | has_a7 = true; |
| 90 | } |
| 91 | |
Geert Uytterhoeven | c94bc81 | 2016-05-17 17:15:33 +0200 | [diff] [blame] | 92 | if (of_machine_is_compatible("renesas,r8a7790")) |
Gaku Inami | a8caad6 | 2015-03-16 14:48:43 +0900 | [diff] [blame] | 93 | syscier = 0x013111ef; |
Geert Uytterhoeven | c94bc81 | 2016-05-17 17:15:33 +0200 | [diff] [blame] | 94 | else if (of_machine_is_compatible("renesas,r8a7791")) |
Gaku Inami | a8caad6 | 2015-03-16 14:48:43 +0900 | [diff] [blame] | 95 | syscier = 0x00111003; |
Gaku Inami | a8caad6 | 2015-03-16 14:48:43 +0900 | [diff] [blame] | 96 | |
Geert Uytterhoeven | 8167569 | 2017-07-04 17:41:36 +0200 | [diff] [blame] | 97 | np = of_find_compatible_node(NULL, NULL, "renesas,smp-sram"); |
| 98 | if (!np) { |
| 99 | /* No smp-sram in DT, fall back to hardcoded address */ |
| 100 | res = (struct resource)DEFINE_RES_MEM(ICRAM1, |
| 101 | shmobile_boot_size); |
| 102 | goto map; |
| 103 | } |
| 104 | |
| 105 | error = of_address_to_resource(np, 0, &res); |
| 106 | if (error) { |
| 107 | pr_err("Failed to get smp-sram address: %d\n", error); |
| 108 | return; |
| 109 | } |
| 110 | |
| 111 | map: |
Gaku Inami | a8caad6 | 2015-03-16 14:48:43 +0900 | [diff] [blame] | 112 | /* RAM for jump stub, because BAR requires 256KB aligned address */ |
Geert Uytterhoeven | 8167569 | 2017-07-04 17:41:36 +0200 | [diff] [blame] | 113 | if (res.start & (256 * 1024 - 1) || |
| 114 | resource_size(&res) < shmobile_boot_size) { |
| 115 | pr_err("Invalid smp-sram region\n"); |
| 116 | return; |
| 117 | } |
| 118 | |
| 119 | p = ioremap(res.start, resource_size(&res)); |
| 120 | if (!p) |
| 121 | return; |
| 122 | |
Gaku Inami | a8caad6 | 2015-03-16 14:48:43 +0900 | [diff] [blame] | 123 | memcpy_toio(p, shmobile_boot_vector, shmobile_boot_size); |
| 124 | iounmap(p); |
| 125 | |
| 126 | /* setup reset vectors */ |
| 127 | p = ioremap_nocache(RST, 0x63); |
Geert Uytterhoeven | 8167569 | 2017-07-04 17:41:36 +0200 | [diff] [blame] | 128 | bar = phys_to_sbar(res.start); |
Gaku Inami | a8caad6 | 2015-03-16 14:48:43 +0900 | [diff] [blame] | 129 | if (has_a15) { |
| 130 | writel_relaxed(bar, p + CA15BAR); |
Geert Uytterhoeven | aa7f39d | 2017-01-25 10:02:13 +0100 | [diff] [blame] | 131 | writel_relaxed(bar | SBAR_BAREN, p + CA15BAR); |
Gaku Inami | a8caad6 | 2015-03-16 14:48:43 +0900 | [diff] [blame] | 132 | |
| 133 | /* de-assert reset for CA15 CPUs */ |
Geert Uytterhoeven | aa7f39d | 2017-01-25 10:02:13 +0100 | [diff] [blame] | 134 | writel_relaxed((readl_relaxed(p + CA15RESCNT) & |
| 135 | ~CA15RESCNT_CPUS) | CA15RESCNT_CODE, |
| 136 | p + CA15RESCNT); |
Gaku Inami | a8caad6 | 2015-03-16 14:48:43 +0900 | [diff] [blame] | 137 | } |
| 138 | if (has_a7) { |
| 139 | writel_relaxed(bar, p + CA7BAR); |
Geert Uytterhoeven | aa7f39d | 2017-01-25 10:02:13 +0100 | [diff] [blame] | 140 | writel_relaxed(bar | SBAR_BAREN, p + CA7BAR); |
Gaku Inami | a8caad6 | 2015-03-16 14:48:43 +0900 | [diff] [blame] | 141 | |
| 142 | /* de-assert reset for CA7 CPUs */ |
Geert Uytterhoeven | aa7f39d | 2017-01-25 10:02:13 +0100 | [diff] [blame] | 143 | writel_relaxed((readl_relaxed(p + CA7RESCNT) & |
| 144 | ~CA7RESCNT_CPUS) | CA7RESCNT_CODE, |
| 145 | p + CA7RESCNT); |
Gaku Inami | a8caad6 | 2015-03-16 14:48:43 +0900 | [diff] [blame] | 146 | } |
| 147 | iounmap(p); |
| 148 | |
| 149 | rcar_gen2_sysc_init(syscier); |
| 150 | shmobile_smp_apmu_suspend_init(); |
| 151 | } |