1 /* 2 * Device Tree support for Armada 370 and XP platforms. 3 * 4 * Copyright (C) 2012 Marvell 5 * 6 * Lior Amsalem <alior@marvell.com> 7 * Gregory CLEMENT <gregory.clement@free-electrons.com> 8 * Thomas Petazzoni <thomas.petazzoni@free-electrons.com> 9 * 10 * This file is licensed under the terms of the GNU General Public 11 * License version 2. This program is licensed "as is" without any 12 * warranty of any kind, whether express or implied. 13 */ 14 15 #include <linux/kernel.h> 16 #include <linux/init.h> 17 #include <linux/clk-provider.h> 18 #include <linux/of_address.h> 19 #include <linux/of_platform.h> 20 #include <linux/io.h> 21 #include <linux/clocksource.h> 22 #include <linux/dma-mapping.h> 23 #include <linux/mbus.h> 24 #include <linux/slab.h> 25 #include <asm/hardware/cache-l2x0.h> 26 #include <asm/mach/arch.h> 27 #include <asm/mach/map.h> 28 #include <asm/mach/time.h> 29 #include "armada-370-xp.h" 30 #include "common.h" 31 #include "coherency.h" 32 #include "mvebu-soc-id.h" 33 34 /* 35 * Early versions of Armada 375 SoC have a bug where the BootROM 36 * leaves an external data abort pending. The kernel is hit by this 37 * data abort as soon as it enters userspace, because it unmasks the 38 * data aborts at this moment. We register a custom abort handler 39 * below to ignore the first data abort to work around this 40 * problem. 41 */ 42 static int armada_375_external_abort_wa(unsigned long addr, unsigned int fsr, 43 struct pt_regs *regs) 44 { 45 static int ignore_first; 46 47 if (!ignore_first && fsr == 0x1406) { 48 ignore_first = 1; 49 return 0; 50 } 51 52 return 1; 53 } 54 55 static void __init mvebu_timer_and_clk_init(void) 56 { 57 of_clk_init(NULL); 58 clocksource_of_init(); 59 coherency_init(); 60 BUG_ON(mvebu_mbus_dt_init()); 61 #ifdef CONFIG_CACHE_L2X0 62 l2x0_of_init(0, ~0UL); 63 #endif 64 65 if (of_machine_is_compatible("marvell,armada375")) 66 hook_fault_code(16 + 6, armada_375_external_abort_wa, SIGBUS, 0, 67 "imprecise external abort"); 68 } 69 70 static void __init i2c_quirk(void) 71 { 72 struct device_node *np; 73 u32 dev, rev; 74 75 /* 76 * Only revisons more recent than A0 support the offload 77 * mechanism. We can exit only if we are sure that we can 78 * get the SoC revision and it is more recent than A0. 79 */ 80 if (mvebu_get_soc_id(&rev, &dev) == 0 && dev > MV78XX0_A0_REV) 81 return; 82 83 for_each_compatible_node(np, NULL, "marvell,mv78230-i2c") { 84 struct property *new_compat; 85 86 new_compat = kzalloc(sizeof(*new_compat), GFP_KERNEL); 87 88 new_compat->name = kstrdup("compatible", GFP_KERNEL); 89 new_compat->length = sizeof("marvell,mv78230-a0-i2c"); 90 new_compat->value = kstrdup("marvell,mv78230-a0-i2c", 91 GFP_KERNEL); 92 93 of_update_property(np, new_compat); 94 } 95 return; 96 } 97 98 static void __init mvebu_dt_init(void) 99 { 100 if (of_machine_is_compatible("plathome,openblocks-ax3-4")) 101 i2c_quirk(); 102 of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL); 103 } 104 105 static const char * const armada_370_xp_dt_compat[] = { 106 "marvell,armada-370-xp", 107 NULL, 108 }; 109 110 DT_MACHINE_START(ARMADA_370_XP_DT, "Marvell Armada 370/XP (Device Tree)") 111 .smp = smp_ops(armada_xp_smp_ops), 112 .init_machine = mvebu_dt_init, 113 .init_time = mvebu_timer_and_clk_init, 114 .restart = mvebu_restart, 115 .dt_compat = armada_370_xp_dt_compat, 116 MACHINE_END 117 118 static const char * const armada_375_dt_compat[] = { 119 "marvell,armada375", 120 NULL, 121 }; 122 123 DT_MACHINE_START(ARMADA_375_DT, "Marvell Armada 375 (Device Tree)") 124 .init_time = mvebu_timer_and_clk_init, 125 .restart = mvebu_restart, 126 .dt_compat = armada_375_dt_compat, 127 MACHINE_END 128 129 static const char * const armada_38x_dt_compat[] = { 130 "marvell,armada380", 131 "marvell,armada385", 132 NULL, 133 }; 134 135 DT_MACHINE_START(ARMADA_38X_DT, "Marvell Armada 380/385 (Device Tree)") 136 .init_time = mvebu_timer_and_clk_init, 137 .restart = mvebu_restart, 138 .dt_compat = armada_38x_dt_compat, 139 MACHINE_END 140