| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Keystone2 based boards and SOC related code. |
| 3 | * |
| 4 | * Copyright 2013 Texas Instruments, Inc. |
| 5 | * Cyril Chemparathy <cyril@ti.com> |
| 6 | * Santosh Shilimkar <santosh.shillimkar@ti.com> |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify it |
| 9 | * under the terms and conditions of the GNU General Public License, |
| 10 | * version 2, as published by the Free Software Foundation. |
| 11 | */ |
| 12 | #include <linux/io.h> |
| 13 | #include <linux/of.h> |
| 14 | #include <linux/init.h> |
| 15 | #include <linux/of_platform.h> |
| 16 | #include <linux/of_address.h> |
| 17 | #include <linux/memblock.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/smp_plat.h> |
| 24 | #include <asm/memory.h> |
| 25 | |
| 26 | #include "memory.h" |
| 27 | |
| 28 | #include "keystone.h" |
| 29 | |
| 30 | static unsigned long keystone_dma_pfn_offset __read_mostly; |
| 31 | |
| 32 | static int keystone_platform_notifier(struct notifier_block *nb, |
| 33 | unsigned long event, void *data) |
| 34 | { |
| 35 | struct device *dev = data; |
| 36 | |
| 37 | if (event != BUS_NOTIFY_ADD_DEVICE) |
| 38 | return NOTIFY_DONE; |
| 39 | |
| 40 | if (!dev) |
| 41 | return NOTIFY_BAD; |
| 42 | |
| 43 | if (!dev->of_node) { |
| 44 | dev->dma_pfn_offset = keystone_dma_pfn_offset; |
| 45 | dev_err(dev, "set dma_pfn_offset%08lx\n", |
| 46 | dev->dma_pfn_offset); |
| 47 | } |
| 48 | return NOTIFY_OK; |
| 49 | } |
| 50 | |
| 51 | static struct notifier_block platform_nb = { |
| 52 | .notifier_call = keystone_platform_notifier, |
| 53 | }; |
| 54 | |
| 55 | static void __init keystone_init(void) |
| 56 | { |
| 57 | if (PHYS_OFFSET >= KEYSTONE_HIGH_PHYS_START) { |
| 58 | keystone_dma_pfn_offset = PFN_DOWN(KEYSTONE_HIGH_PHYS_START - |
| 59 | KEYSTONE_LOW_PHYS_START); |
| 60 | bus_register_notifier(&platform_bus_type, &platform_nb); |
| 61 | } |
| 62 | keystone_pm_runtime_init(); |
| 63 | } |
| 64 | |
| 65 | static long long __init keystone_pv_fixup(void) |
| 66 | { |
| 67 | long long offset; |
| 68 | phys_addr_t 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 | (u64)mem_start, (u64)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 |