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/interrupt.h> 16 #include <linux/irq.h> 17 #include <linux/irqchip.h> 18 #include <linux/irqchip/arm-gic.h> 19 #include <linux/mfd/dbx500-prcmu.h> 20 #include <linux/platform_data/arm-ux500-pm.h> 21 #include <linux/platform_device.h> 22 #include <linux/io.h> 23 #include <linux/of.h> 24 #include <linux/of_address.h> 25 #include <linux/of_platform.h> 26 #include <linux/regulator/machine.h> 27 28 #include <asm/outercache.h> 29 #include <asm/hardware/cache-l2x0.h> 30 #include <asm/mach/map.h> 31 #include <asm/mach/arch.h> 32 33 #include "db8500-regs.h" 34 #include "pm_domains.h" 35 36 static int __init ux500_l2x0_unlock(void) 37 { 38 int i; 39 struct device_node *np; 40 void __iomem *l2x0_base; 41 42 np = of_find_compatible_node(NULL, NULL, "arm,pl310-cache"); 43 l2x0_base = of_iomap(np, 0); 44 of_node_put(np); 45 if (!l2x0_base) 46 return -ENODEV; 47 48 /* 49 * Unlock Data and Instruction Lock if locked. Ux500 U-Boot versions 50 * apparently locks both caches before jumping to the kernel. The 51 * l2x0 core will not touch the unlock registers if the l2x0 is 52 * already enabled, so we do it right here instead. The PL310 has 53 * 8 sets of registers, one per possible CPU. 54 */ 55 for (i = 0; i < 8; i++) { 56 writel_relaxed(0x0, l2x0_base + L2X0_LOCKDOWN_WAY_D_BASE + 57 i * L2X0_LOCKDOWN_STRIDE); 58 writel_relaxed(0x0, l2x0_base + L2X0_LOCKDOWN_WAY_I_BASE + 59 i * L2X0_LOCKDOWN_STRIDE); 60 } 61 iounmap(l2x0_base); 62 return 0; 63 } 64 65 static void ux500_l2c310_write_sec(unsigned long val, unsigned reg) 66 { 67 /* 68 * We can't write to secure registers as we are in non-secure 69 * mode, until we have some SMI service available. 70 */ 71 } 72 73 /* 74 * FIXME: Should we set up the GPIO domain here? 75 * 76 * The problem is that we cannot put the interrupt resources into the platform 77 * device until the irqdomain has been added. Right now, we set the GIC interrupt 78 * domain from init_irq(), then load the gpio driver from 79 * core_initcall(nmk_gpio_init) and add the platform devices from 80 * arch_initcall(customize_machine). 81 * 82 * This feels fragile because it depends on the gpio device getting probed 83 * _before_ any device uses the gpio interrupts. 84 */ 85 static void __init ux500_init_irq(void) 86 { 87 struct device_node *np; 88 struct resource r; 89 90 irqchip_init(); 91 np = of_find_compatible_node(NULL, NULL, "stericsson,db8500-prcmu"); 92 of_address_to_resource(np, 0, &r); 93 of_node_put(np); 94 if (!r.start) { 95 pr_err("could not find PRCMU base resource\n"); 96 return; 97 } 98 prcmu_early_init(r.start, r.end-r.start); 99 ux500_pm_init(r.start, r.end-r.start); 100 101 /* Unlock before init */ 102 ux500_l2x0_unlock(); 103 outer_cache.write_sec = ux500_l2c310_write_sec; 104 } 105 106 static void ux500_restart(enum reboot_mode mode, const char *cmd) 107 { 108 local_irq_disable(); 109 local_fiq_disable(); 110 111 prcmu_system_reset(0); 112 } 113 114 static const struct of_device_id u8500_local_bus_nodes[] = { 115 /* only create devices below soc node */ 116 { .compatible = "stericsson,db8500", }, 117 { .compatible = "stericsson,db8500-prcmu", }, 118 { .compatible = "simple-bus"}, 119 { }, 120 }; 121 122 static void __init u8500_init_machine(void) 123 { 124 /* Initialize ux500 power domains */ 125 ux500_pm_domains_init(); 126 127 of_platform_populate(NULL, u8500_local_bus_nodes, 128 NULL, NULL); 129 } 130 131 static const char * stericsson_dt_platform_compat[] = { 132 "st-ericsson,u8500", 133 "st-ericsson,u9500", 134 NULL, 135 }; 136 137 DT_MACHINE_START(U8500_DT, "ST-Ericsson Ux5x0 platform (Device Tree Support)") 138 .l2c_aux_val = 0, 139 .l2c_aux_mask = ~0, 140 .init_irq = ux500_init_irq, 141 .init_machine = u8500_init_machine, 142 .dt_compat = stericsson_dt_platform_compat, 143 .restart = ux500_restart, 144 MACHINE_END 145