1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Keystone2 based boards and SOC related code. 4 * 5 * Copyright 2013 Texas Instruments, Inc. 6 * Cyril Chemparathy <cyril@ti.com> 7 * Santosh Shilimkar <santosh.shillimkar@ti.com> 8 */ 9 10 #include <linux/io.h> 11 #include <linux/dma-map-ops.h> 12 #include <linux/init.h> 13 #include <linux/pm_runtime.h> 14 #include <linux/pm_clock.h> 15 #include <linux/memblock.h> 16 #include <linux/of.h> 17 #include <linux/platform_device.h> 18 19 #include <asm/setup.h> 20 #include <asm/mach/map.h> 21 #include <asm/mach/arch.h> 22 #include <asm/mach/time.h> 23 #include <asm/page.h> 24 25 #define KEYSTONE_LOW_PHYS_START 0x80000000ULL 26 #define KEYSTONE_LOW_PHYS_SIZE 0x80000000ULL /* 2G */ 27 #define KEYSTONE_LOW_PHYS_END (KEYSTONE_LOW_PHYS_START + \ 28 KEYSTONE_LOW_PHYS_SIZE - 1) 29 30 #define KEYSTONE_HIGH_PHYS_START 0x800000000ULL 31 #define KEYSTONE_HIGH_PHYS_SIZE 0x400000000ULL /* 16G */ 32 #define KEYSTONE_HIGH_PHYS_END (KEYSTONE_HIGH_PHYS_START + \ 33 KEYSTONE_HIGH_PHYS_SIZE - 1) 34 35 static struct dev_pm_domain keystone_pm_domain = { 36 .ops = { 37 USE_PM_CLK_RUNTIME_OPS 38 USE_PLATFORM_PM_SLEEP_OPS 39 }, 40 }; 41 42 static struct pm_clk_notifier_block platform_domain_notifier = { 43 .pm_domain = &keystone_pm_domain, 44 .con_ids = { NULL }, 45 }; 46 47 static const struct of_device_id of_keystone_table[] = { 48 {.compatible = "ti,k2hk"}, 49 {.compatible = "ti,k2e"}, 50 {.compatible = "ti,k2l"}, 51 { /* end of list */ }, 52 }; 53 54 static int __init keystone_pm_runtime_init(void) 55 { 56 struct device_node *np; 57 58 np = of_find_matching_node(NULL, of_keystone_table); 59 if (!np) 60 return 0; 61 62 pm_clk_add_notifier(&platform_bus_type, &platform_domain_notifier); 63 64 return 0; 65 } 66 67 #ifdef CONFIG_ARM_LPAE 68 static int keystone_platform_notifier(struct notifier_block *nb, 69 unsigned long event, void *data) 70 { 71 struct device *dev = data; 72 73 if (event != BUS_NOTIFY_ADD_DEVICE) 74 return NOTIFY_DONE; 75 76 if (!dev) 77 return NOTIFY_BAD; 78 79 if (!dev->of_node) { 80 int ret = dma_direct_set_offset(dev, KEYSTONE_HIGH_PHYS_START, 81 KEYSTONE_LOW_PHYS_START, 82 KEYSTONE_HIGH_PHYS_SIZE); 83 dev_err(dev, "set dma_offset%08llx%s\n", 84 KEYSTONE_HIGH_PHYS_START - KEYSTONE_LOW_PHYS_START, 85 ret ? " failed" : ""); 86 } 87 return NOTIFY_OK; 88 } 89 90 static struct notifier_block platform_nb = { 91 .notifier_call = keystone_platform_notifier, 92 }; 93 #endif /* CONFIG_ARM_LPAE */ 94 95 static void __init keystone_init(void) 96 { 97 #ifdef CONFIG_ARM_LPAE 98 if (PHYS_OFFSET >= KEYSTONE_HIGH_PHYS_START) 99 bus_register_notifier(&platform_bus_type, &platform_nb); 100 #endif 101 keystone_pm_runtime_init(); 102 } 103 104 static long long __init keystone_pv_fixup(void) 105 { 106 long long offset; 107 u64 mem_start, mem_end; 108 109 mem_start = memblock_start_of_DRAM(); 110 mem_end = memblock_end_of_DRAM(); 111 112 /* nothing to do if we are running out of the <32-bit space */ 113 if (mem_start >= KEYSTONE_LOW_PHYS_START && 114 mem_end <= KEYSTONE_LOW_PHYS_END) 115 return 0; 116 117 if (mem_start < KEYSTONE_HIGH_PHYS_START || 118 mem_end > KEYSTONE_HIGH_PHYS_END) { 119 pr_crit("Invalid address space for memory (%08llx-%08llx)\n", 120 mem_start, mem_end); 121 return 0; 122 } 123 124 offset = KEYSTONE_HIGH_PHYS_START - KEYSTONE_LOW_PHYS_START; 125 126 /* Populate the arch idmap hook */ 127 arch_phys_to_idmap_offset = -offset; 128 129 return offset; 130 } 131 132 static const char *const keystone_match[] __initconst = { 133 "ti,k2hk", 134 "ti,k2e", 135 "ti,k2l", 136 "ti,k2g", 137 "ti,keystone", 138 NULL, 139 }; 140 141 DT_MACHINE_START(KEYSTONE, "Keystone") 142 #if defined(CONFIG_ZONE_DMA) && defined(CONFIG_ARM_LPAE) 143 .dma_zone_size = SZ_2G, 144 #endif 145 .init_machine = keystone_init, 146 .dt_compat = keystone_match, 147 .pv_fixup = keystone_pv_fixup, 148 MACHINE_END 149