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