1 /* 2 * Copyright (C) 2008-2009 ST-Ericsson SA 3 * 4 * Author: Srinidhi KASAGAR <srinidhi.kasagar@stericsson.com> 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License version 2, as 8 * published by the Free Software Foundation. 9 * 10 */ 11 #include <linux/types.h> 12 #include <linux/init.h> 13 #include <linux/device.h> 14 #include <linux/amba/bus.h> 15 #include <linux/init.h> 16 #include <linux/interrupt.h> 17 #include <linux/irq.h> 18 #include <linux/irqchip.h> 19 #include <linux/irqchip/arm-gic.h> 20 #include <linux/mfd/dbx500-prcmu.h> 21 #include <linux/platform_data/arm-ux500-pm.h> 22 #include <linux/platform_device.h> 23 #include <linux/io.h> 24 #include <linux/of.h> 25 #include <linux/of_address.h> 26 #include <linux/of_platform.h> 27 #include <linux/perf/arm_pmu.h> 28 #include <linux/regulator/machine.h> 29 30 #include <asm/outercache.h> 31 #include <asm/hardware/cache-l2x0.h> 32 #include <asm/mach/map.h> 33 #include <asm/mach/arch.h> 34 35 #include "setup.h" 36 37 #include "board-mop500.h" 38 #include "db8500-regs.h" 39 40 static int __init ux500_l2x0_unlock(void) 41 { 42 int i; 43 struct device_node *np; 44 void __iomem *l2x0_base; 45 46 np = of_find_compatible_node(NULL, NULL, "arm,pl310-cache"); 47 l2x0_base = of_iomap(np, 0); 48 of_node_put(np); 49 if (!l2x0_base) 50 return -ENODEV; 51 52 /* 53 * Unlock Data and Instruction Lock if locked. Ux500 U-Boot versions 54 * apparently locks both caches before jumping to the kernel. The 55 * l2x0 core will not touch the unlock registers if the l2x0 is 56 * already enabled, so we do it right here instead. The PL310 has 57 * 8 sets of registers, one per possible CPU. 58 */ 59 for (i = 0; i < 8; i++) { 60 writel_relaxed(0x0, l2x0_base + L2X0_LOCKDOWN_WAY_D_BASE + 61 i * L2X0_LOCKDOWN_STRIDE); 62 writel_relaxed(0x0, l2x0_base + L2X0_LOCKDOWN_WAY_I_BASE + 63 i * L2X0_LOCKDOWN_STRIDE); 64 } 65 iounmap(l2x0_base); 66 return 0; 67 } 68 69 static void ux500_l2c310_write_sec(unsigned long val, unsigned reg) 70 { 71 /* 72 * We can't write to secure registers as we are in non-secure 73 * mode, until we have some SMI service available. 74 */ 75 } 76 77 /* 78 * FIXME: Should we set up the GPIO domain here? 79 * 80 * The problem is that we cannot put the interrupt resources into the platform 81 * device until the irqdomain has been added. Right now, we set the GIC interrupt 82 * domain from init_irq(), then load the gpio driver from 83 * core_initcall(nmk_gpio_init) and add the platform devices from 84 * arch_initcall(customize_machine). 85 * 86 * This feels fragile because it depends on the gpio device getting probed 87 * _before_ any device uses the gpio interrupts. 88 */ 89 static void __init ux500_init_irq(void) 90 { 91 struct device_node *np; 92 struct resource r; 93 94 irqchip_init(); 95 np = of_find_compatible_node(NULL, NULL, "stericsson,db8500-prcmu"); 96 of_address_to_resource(np, 0, &r); 97 of_node_put(np); 98 if (!r.start) { 99 pr_err("could not find PRCMU base resource\n"); 100 return; 101 } 102 prcmu_early_init(r.start, r.end-r.start); 103 ux500_pm_init(r.start, r.end-r.start); 104 105 /* Unlock before init */ 106 ux500_l2x0_unlock(); 107 outer_cache.write_sec = ux500_l2c310_write_sec; 108 } 109 110 static void ux500_restart(enum reboot_mode mode, const char *cmd) 111 { 112 local_irq_disable(); 113 local_fiq_disable(); 114 115 prcmu_system_reset(0); 116 } 117 118 /* 119 * The PMU IRQ lines of two cores are wired together into a single interrupt. 120 * Bounce the interrupt to the other core if it's not ours. 121 */ 122 static irqreturn_t db8500_pmu_handler(int irq, void *dev, irq_handler_t handler) 123 { 124 irqreturn_t ret = handler(irq, dev); 125 int other = !smp_processor_id(); 126 127 if (ret == IRQ_NONE && cpu_online(other)) 128 irq_set_affinity(irq, cpumask_of(other)); 129 130 /* 131 * We should be able to get away with the amount of IRQ_NONEs we give, 132 * while still having the spurious IRQ detection code kick in if the 133 * interrupt really starts hitting spuriously. 134 */ 135 return ret; 136 } 137 138 static struct arm_pmu_platdata db8500_pmu_platdata = { 139 .handle_irq = db8500_pmu_handler, 140 }; 141 142 static struct of_dev_auxdata u8500_auxdata_lookup[] __initdata = { 143 /* Requires call-back bindings. */ 144 OF_DEV_AUXDATA("arm,cortex-a9-pmu", 0, "arm-pmu", &db8500_pmu_platdata), 145 /* Requires DMA bindings. */ 146 OF_DEV_AUXDATA("stericsson,ux500-msp-i2s", 0x80123000, 147 "ux500-msp-i2s.0", &msp0_platform_data), 148 OF_DEV_AUXDATA("stericsson,ux500-msp-i2s", 0x80124000, 149 "ux500-msp-i2s.1", &msp1_platform_data), 150 OF_DEV_AUXDATA("stericsson,ux500-msp-i2s", 0x80117000, 151 "ux500-msp-i2s.2", &msp2_platform_data), 152 OF_DEV_AUXDATA("stericsson,ux500-msp-i2s", 0x80125000, 153 "ux500-msp-i2s.3", &msp3_platform_data), 154 /* Requires non-DT:able platform data. */ 155 OF_DEV_AUXDATA("stericsson,db8500-prcmu", 0x80157000, "db8500-prcmu", NULL), 156 OF_DEV_AUXDATA("stericsson,ux500-cryp", 0xa03cb000, "cryp1", NULL), 157 OF_DEV_AUXDATA("stericsson,ux500-hash", 0xa03c2000, "hash1", NULL), 158 OF_DEV_AUXDATA("stericsson,snd-soc-mop500", 0, "snd-soc-mop500.0", 159 NULL), 160 {}, 161 }; 162 163 static struct of_dev_auxdata u8540_auxdata_lookup[] __initdata = { 164 OF_DEV_AUXDATA("stericsson,db8500-prcmu", 0x80157000, "db8500-prcmu", NULL), 165 {}, 166 }; 167 168 static const struct of_device_id u8500_local_bus_nodes[] = { 169 /* only create devices below soc node */ 170 { .compatible = "stericsson,db8500", }, 171 { .compatible = "stericsson,db8500-prcmu", }, 172 { .compatible = "simple-bus"}, 173 { }, 174 }; 175 176 static void __init u8500_init_machine(void) 177 { 178 /* automatically probe child nodes of dbx5x0 devices */ 179 if (of_machine_is_compatible("st-ericsson,u8540")) 180 of_platform_populate(NULL, u8500_local_bus_nodes, 181 u8540_auxdata_lookup, NULL); 182 else 183 of_platform_populate(NULL, u8500_local_bus_nodes, 184 u8500_auxdata_lookup, NULL); 185 } 186 187 static const char * stericsson_dt_platform_compat[] = { 188 "st-ericsson,u8500", 189 "st-ericsson,u8540", 190 "st-ericsson,u9500", 191 "st-ericsson,u9540", 192 NULL, 193 }; 194 195 DT_MACHINE_START(U8500_DT, "ST-Ericsson Ux5x0 platform (Device Tree Support)") 196 .l2c_aux_val = 0, 197 .l2c_aux_mask = ~0, 198 .init_irq = ux500_init_irq, 199 .init_machine = u8500_init_machine, 200 .dt_compat = stericsson_dt_platform_compat, 201 .restart = ux500_restart, 202 MACHINE_END 203