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/signal.h> 25 #include <linux/slab.h> 26 #include <asm/hardware/cache-l2x0.h> 27 #include <asm/mach/arch.h> 28 #include <asm/mach/map.h> 29 #include <asm/mach/time.h> 30 #include "armada-370-xp.h" 31 #include "common.h" 32 #include "coherency.h" 33 #include "mvebu-soc-id.h" 34 35 /* 36 * Early versions of Armada 375 SoC have a bug where the BootROM 37 * leaves an external data abort pending. The kernel is hit by this 38 * data abort as soon as it enters userspace, because it unmasks the 39 * data aborts at this moment. We register a custom abort handler 40 * below to ignore the first data abort to work around this 41 * problem. 42 */ 43 static int armada_375_external_abort_wa(unsigned long addr, unsigned int fsr, 44 struct pt_regs *regs) 45 { 46 static int ignore_first; 47 48 if (!ignore_first && fsr == 0x1406) { 49 ignore_first = 1; 50 return 0; 51 } 52 53 return 1; 54 } 55 56 static void __init mvebu_timer_and_clk_init(void) 57 { 58 of_clk_init(NULL); 59 clocksource_of_init(); 60 coherency_init(); 61 BUG_ON(mvebu_mbus_dt_init()); 62 #ifdef CONFIG_CACHE_L2X0 63 l2x0_of_init(0, ~0UL); 64 #endif 65 66 if (of_machine_is_compatible("marvell,armada375")) 67 hook_fault_code(16 + 6, armada_375_external_abort_wa, SIGBUS, 0, 68 "imprecise external abort"); 69 } 70 71 static void __init i2c_quirk(void) 72 { 73 struct device_node *np; 74 u32 dev, rev; 75 76 /* 77 * Only revisons more recent than A0 support the offload 78 * mechanism. We can exit only if we are sure that we can 79 * get the SoC revision and it is more recent than A0. 80 */ 81 if (mvebu_get_soc_id(&rev, &dev) == 0 && dev > MV78XX0_A0_REV) 82 return; 83 84 for_each_compatible_node(np, NULL, "marvell,mv78230-i2c") { 85 struct property *new_compat; 86 87 new_compat = kzalloc(sizeof(*new_compat), GFP_KERNEL); 88 89 new_compat->name = kstrdup("compatible", GFP_KERNEL); 90 new_compat->length = sizeof("marvell,mv78230-a0-i2c"); 91 new_compat->value = kstrdup("marvell,mv78230-a0-i2c", 92 GFP_KERNEL); 93 94 of_update_property(np, new_compat); 95 } 96 return; 97 } 98 99 static void __init mvebu_dt_init(void) 100 { 101 if (of_machine_is_compatible("plathome,openblocks-ax3-4")) 102 i2c_quirk(); 103 of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL); 104 } 105 106 static const char * const armada_370_xp_dt_compat[] = { 107 "marvell,armada-370-xp", 108 NULL, 109 }; 110 111 DT_MACHINE_START(ARMADA_370_XP_DT, "Marvell Armada 370/XP (Device Tree)") 112 .smp = smp_ops(armada_xp_smp_ops), 113 .init_machine = mvebu_dt_init, 114 .init_time = mvebu_timer_and_clk_init, 115 .restart = mvebu_restart, 116 .dt_compat = armada_370_xp_dt_compat, 117 MACHINE_END 118 119 static const char * const armada_375_dt_compat[] = { 120 "marvell,armada375", 121 NULL, 122 }; 123 124 DT_MACHINE_START(ARMADA_375_DT, "Marvell Armada 375 (Device Tree)") 125 .init_time = mvebu_timer_and_clk_init, 126 .restart = mvebu_restart, 127 .dt_compat = armada_375_dt_compat, 128 MACHINE_END 129 130 static const char * const armada_38x_dt_compat[] = { 131 "marvell,armada380", 132 "marvell,armada385", 133 NULL, 134 }; 135 136 DT_MACHINE_START(ARMADA_38X_DT, "Marvell Armada 380/385 (Device Tree)") 137 .init_time = mvebu_timer_and_clk_init, 138 .restart = mvebu_restart, 139 .dt_compat = armada_38x_dt_compat, 140 MACHINE_END 141