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 <linux/irqchip.h> 27 #include <asm/hardware/cache-l2x0.h> 28 #include <asm/mach/arch.h> 29 #include <asm/mach/map.h> 30 #include <asm/mach/time.h> 31 #include <asm/smp_scu.h> 32 #include "armada-370-xp.h" 33 #include "common.h" 34 #include "coherency.h" 35 #include "mvebu-soc-id.h" 36 37 /* 38 * Enables the SCU when available. Obviously, this is only useful on 39 * Cortex-A based SOCs, not on PJ4B based ones. 40 */ 41 static void __init mvebu_scu_enable(void) 42 { 43 void __iomem *scu_base; 44 45 struct device_node *np = 46 of_find_compatible_node(NULL, NULL, "arm,cortex-a9-scu"); 47 if (np) { 48 scu_base = of_iomap(np, 0); 49 scu_enable(scu_base); 50 of_node_put(np); 51 } 52 } 53 54 /* 55 * Early versions of Armada 375 SoC have a bug where the BootROM 56 * leaves an external data abort pending. The kernel is hit by this 57 * data abort as soon as it enters userspace, because it unmasks the 58 * data aborts at this moment. We register a custom abort handler 59 * below to ignore the first data abort to work around this 60 * problem. 61 */ 62 static int armada_375_external_abort_wa(unsigned long addr, unsigned int fsr, 63 struct pt_regs *regs) 64 { 65 static int ignore_first; 66 67 if (!ignore_first && fsr == 0x1406) { 68 ignore_first = 1; 69 return 0; 70 } 71 72 return 1; 73 } 74 75 static void __init mvebu_init_irq(void) 76 { 77 irqchip_init(); 78 mvebu_scu_enable(); 79 coherency_init(); 80 BUG_ON(mvebu_mbus_dt_init(coherency_available())); 81 } 82 83 static void __init external_abort_quirk(void) 84 { 85 u32 dev, rev; 86 87 if (mvebu_get_soc_id(&dev, &rev) == 0 && rev > ARMADA_375_Z1_REV) 88 return; 89 90 hook_fault_code(16 + 6, armada_375_external_abort_wa, SIGBUS, 0, 91 "imprecise external abort"); 92 } 93 94 static void __init i2c_quirk(void) 95 { 96 struct device_node *np; 97 u32 dev, rev; 98 99 /* 100 * Only revisons more recent than A0 support the offload 101 * mechanism. We can exit only if we are sure that we can 102 * get the SoC revision and it is more recent than A0. 103 */ 104 if (mvebu_get_soc_id(&dev, &rev) == 0 && rev > MV78XX0_A0_REV) 105 return; 106 107 for_each_compatible_node(np, NULL, "marvell,mv78230-i2c") { 108 struct property *new_compat; 109 110 new_compat = kzalloc(sizeof(*new_compat), GFP_KERNEL); 111 112 new_compat->name = kstrdup("compatible", GFP_KERNEL); 113 new_compat->length = sizeof("marvell,mv78230-a0-i2c"); 114 new_compat->value = kstrdup("marvell,mv78230-a0-i2c", 115 GFP_KERNEL); 116 117 of_update_property(np, new_compat); 118 } 119 return; 120 } 121 122 #define A375_Z1_THERMAL_FIXUP_OFFSET 0xc 123 124 static void __init thermal_quirk(void) 125 { 126 struct device_node *np; 127 u32 dev, rev; 128 129 if (mvebu_get_soc_id(&dev, &rev) == 0 && rev > ARMADA_375_Z1_REV) 130 return; 131 132 for_each_compatible_node(np, NULL, "marvell,armada375-thermal") { 133 struct property *prop; 134 __be32 newval, *newprop, *oldprop; 135 int len; 136 137 /* 138 * The register offset is at a wrong location. This quirk 139 * creates a new reg property as a clone of the previous 140 * one and corrects the offset. 141 */ 142 oldprop = (__be32 *)of_get_property(np, "reg", &len); 143 if (!oldprop) 144 continue; 145 146 /* Create a duplicate of the 'reg' property */ 147 prop = kzalloc(sizeof(*prop), GFP_KERNEL); 148 prop->length = len; 149 prop->name = kstrdup("reg", GFP_KERNEL); 150 prop->value = kzalloc(len, GFP_KERNEL); 151 memcpy(prop->value, oldprop, len); 152 153 /* Fixup the register offset of the second entry */ 154 oldprop += 2; 155 newprop = (__be32 *)prop->value + 2; 156 newval = cpu_to_be32(be32_to_cpu(*oldprop) - 157 A375_Z1_THERMAL_FIXUP_OFFSET); 158 *newprop = newval; 159 of_update_property(np, prop); 160 161 /* 162 * The thermal controller needs some quirk too, so let's change 163 * the compatible string to reflect this. 164 */ 165 prop = kzalloc(sizeof(*prop), GFP_KERNEL); 166 prop->name = kstrdup("compatible", GFP_KERNEL); 167 prop->length = sizeof("marvell,armada375-z1-thermal"); 168 prop->value = kstrdup("marvell,armada375-z1-thermal", 169 GFP_KERNEL); 170 of_update_property(np, prop); 171 } 172 return; 173 } 174 175 static void __init mvebu_dt_init(void) 176 { 177 if (of_machine_is_compatible("plathome,openblocks-ax3-4")) 178 i2c_quirk(); 179 if (of_machine_is_compatible("marvell,a375-db")) { 180 external_abort_quirk(); 181 thermal_quirk(); 182 } 183 184 of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL); 185 } 186 187 static const char * const armada_370_xp_dt_compat[] = { 188 "marvell,armada-370-xp", 189 NULL, 190 }; 191 192 DT_MACHINE_START(ARMADA_370_XP_DT, "Marvell Armada 370/XP (Device Tree)") 193 .l2c_aux_val = 0, 194 .l2c_aux_mask = ~0, 195 .smp = smp_ops(armada_xp_smp_ops), 196 .init_machine = mvebu_dt_init, 197 .init_irq = mvebu_init_irq, 198 .restart = mvebu_restart, 199 .dt_compat = armada_370_xp_dt_compat, 200 MACHINE_END 201 202 static const char * const armada_375_dt_compat[] = { 203 "marvell,armada375", 204 NULL, 205 }; 206 207 DT_MACHINE_START(ARMADA_375_DT, "Marvell Armada 375 (Device Tree)") 208 .l2c_aux_val = 0, 209 .l2c_aux_mask = ~0, 210 .init_irq = mvebu_init_irq, 211 .init_machine = mvebu_dt_init, 212 .restart = mvebu_restart, 213 .dt_compat = armada_375_dt_compat, 214 MACHINE_END 215 216 static const char * const armada_38x_dt_compat[] = { 217 "marvell,armada380", 218 "marvell,armada385", 219 NULL, 220 }; 221 222 DT_MACHINE_START(ARMADA_38X_DT, "Marvell Armada 380/385 (Device Tree)") 223 .l2c_aux_val = 0, 224 .l2c_aux_mask = ~0, 225 .init_irq = mvebu_init_irq, 226 .restart = mvebu_restart, 227 .dt_compat = armada_38x_dt_compat, 228 MACHINE_END 229