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 #include <linux/io.h> 10 #include <linux/of.h> 11 #include <linux/dma-map-ops.h> 12 #include <linux/init.h> 13 #include <linux/of_platform.h> 14 #include <linux/of_address.h> 15 #include <linux/memblock.h> 16 17 #include <asm/setup.h> 18 #include <asm/mach/map.h> 19 #include <asm/mach/arch.h> 20 #include <asm/mach/time.h> 21 #include <asm/smp_plat.h> 22 #include <asm/memory.h> 23 24 #include "memory.h" 25 26 #include "keystone.h" 27 28 #ifdef CONFIG_ARM_LPAE 29 static int keystone_platform_notifier(struct notifier_block *nb, 30 unsigned long event, void *data) 31 { 32 struct device *dev = data; 33 34 if (event != BUS_NOTIFY_ADD_DEVICE) 35 return NOTIFY_DONE; 36 37 if (!dev) 38 return NOTIFY_BAD; 39 40 if (!dev->of_node) { 41 int ret = dma_direct_set_offset(dev, KEYSTONE_HIGH_PHYS_START, 42 KEYSTONE_LOW_PHYS_START, 43 KEYSTONE_HIGH_PHYS_SIZE); 44 dev_err(dev, "set dma_offset%08llx%s\n", 45 KEYSTONE_HIGH_PHYS_START - KEYSTONE_LOW_PHYS_START, 46 ret ? " failed" : ""); 47 } 48 return NOTIFY_OK; 49 } 50 51 static struct notifier_block platform_nb = { 52 .notifier_call = keystone_platform_notifier, 53 }; 54 #endif /* CONFIG_ARM_LPAE */ 55 56 static void __init keystone_init(void) 57 { 58 #ifdef CONFIG_ARM_LPAE 59 if (PHYS_OFFSET >= KEYSTONE_HIGH_PHYS_START) 60 bus_register_notifier(&platform_bus_type, &platform_nb); 61 #endif 62 keystone_pm_runtime_init(); 63 } 64 65 static long long __init keystone_pv_fixup(void) 66 { 67 long long offset; 68 u64 mem_start, mem_end; 69 70 mem_start = memblock_start_of_DRAM(); 71 mem_end = memblock_end_of_DRAM(); 72 73 /* nothing to do if we are running out of the <32-bit space */ 74 if (mem_start >= KEYSTONE_LOW_PHYS_START && 75 mem_end <= KEYSTONE_LOW_PHYS_END) 76 return 0; 77 78 if (mem_start < KEYSTONE_HIGH_PHYS_START || 79 mem_end > KEYSTONE_HIGH_PHYS_END) { 80 pr_crit("Invalid address space for memory (%08llx-%08llx)\n", 81 mem_start, mem_end); 82 return 0; 83 } 84 85 offset = KEYSTONE_HIGH_PHYS_START - KEYSTONE_LOW_PHYS_START; 86 87 /* Populate the arch idmap hook */ 88 arch_phys_to_idmap_offset = -offset; 89 90 return offset; 91 } 92 93 static const char *const keystone_match[] __initconst = { 94 "ti,k2hk", 95 "ti,k2e", 96 "ti,k2l", 97 "ti,k2g", 98 "ti,keystone", 99 NULL, 100 }; 101 102 DT_MACHINE_START(KEYSTONE, "Keystone") 103 #if defined(CONFIG_ZONE_DMA) && defined(CONFIG_ARM_LPAE) 104 .dma_zone_size = SZ_2G, 105 #endif 106 .smp = smp_ops(keystone_smp_ops), 107 .init_machine = keystone_init, 108 .dt_compat = keystone_match, 109 .pv_fixup = keystone_pv_fixup, 110 MACHINE_END 111