1 /* 2 * Copyright 2010-2011 Calxeda, Inc. 3 * 4 * This program is free software; you can redistribute it and/or modify it 5 * under the terms and conditions of the GNU General Public License, 6 * version 2, as published by the Free Software Foundation. 7 * 8 * This program is distributed in the hope it will be useful, but WITHOUT 9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 11 * more details. 12 * 13 * You should have received a copy of the GNU General Public License along with 14 * this program. If not, see <http://www.gnu.org/licenses/>. 15 */ 16 #include <linux/clk.h> 17 #include <linux/clkdev.h> 18 #include <linux/io.h> 19 #include <linux/irq.h> 20 #include <linux/irqdomain.h> 21 #include <linux/of.h> 22 #include <linux/of_irq.h> 23 #include <linux/of_platform.h> 24 #include <linux/of_address.h> 25 #include <linux/smp.h> 26 27 #include <asm/cacheflush.h> 28 #include <asm/smp_plat.h> 29 #include <asm/smp_scu.h> 30 #include <asm/smp_twd.h> 31 #include <asm/hardware/arm_timer.h> 32 #include <asm/hardware/timer-sp.h> 33 #include <asm/hardware/gic.h> 34 #include <asm/hardware/cache-l2x0.h> 35 #include <asm/mach/arch.h> 36 #include <asm/mach/map.h> 37 #include <asm/mach/time.h> 38 39 #include "core.h" 40 #include "sysregs.h" 41 42 void __iomem *sregs_base; 43 44 #define HB_SCU_VIRT_BASE 0xfee00000 45 void __iomem *scu_base_addr = ((void __iomem *)(HB_SCU_VIRT_BASE)); 46 47 static struct map_desc scu_io_desc __initdata = { 48 .virtual = HB_SCU_VIRT_BASE, 49 .pfn = 0, /* run-time */ 50 .length = SZ_4K, 51 .type = MT_DEVICE, 52 }; 53 54 static void __init highbank_scu_map_io(void) 55 { 56 unsigned long base; 57 58 /* Get SCU base */ 59 asm("mrc p15, 4, %0, c15, c0, 0" : "=r" (base)); 60 61 scu_io_desc.pfn = __phys_to_pfn(base); 62 iotable_init(&scu_io_desc, 1); 63 } 64 65 static void __init highbank_map_io(void) 66 { 67 highbank_scu_map_io(); 68 highbank_lluart_map_io(); 69 } 70 71 #define HB_JUMP_TABLE_PHYS(cpu) (0x40 + (0x10 * (cpu))) 72 #define HB_JUMP_TABLE_VIRT(cpu) phys_to_virt(HB_JUMP_TABLE_PHYS(cpu)) 73 74 void highbank_set_cpu_jump(int cpu, void *jump_addr) 75 { 76 cpu = cpu_logical_map(cpu); 77 writel(virt_to_phys(jump_addr), HB_JUMP_TABLE_VIRT(cpu)); 78 __cpuc_flush_dcache_area(HB_JUMP_TABLE_VIRT(cpu), 16); 79 outer_clean_range(HB_JUMP_TABLE_PHYS(cpu), 80 HB_JUMP_TABLE_PHYS(cpu) + 15); 81 } 82 83 const static struct of_device_id irq_match[] = { 84 { .compatible = "arm,cortex-a9-gic", .data = gic_of_init, }, 85 {} 86 }; 87 88 #ifdef CONFIG_CACHE_L2X0 89 static void highbank_l2x0_disable(void) 90 { 91 /* Disable PL310 L2 Cache controller */ 92 highbank_smc1(0x102, 0x0); 93 } 94 #endif 95 96 static void __init highbank_init_irq(void) 97 { 98 of_irq_init(irq_match); 99 100 #ifdef CONFIG_CACHE_L2X0 101 /* Enable PL310 L2 Cache controller */ 102 highbank_smc1(0x102, 0x1); 103 l2x0_of_init(0, ~0UL); 104 outer_cache.disable = highbank_l2x0_disable; 105 #endif 106 } 107 108 static struct clk_lookup lookup = { 109 .dev_id = "sp804", 110 .con_id = NULL, 111 }; 112 113 static void __init highbank_timer_init(void) 114 { 115 int irq; 116 struct device_node *np; 117 void __iomem *timer_base; 118 119 /* Map system registers */ 120 np = of_find_compatible_node(NULL, NULL, "calxeda,hb-sregs"); 121 sregs_base = of_iomap(np, 0); 122 WARN_ON(!sregs_base); 123 124 np = of_find_compatible_node(NULL, NULL, "arm,sp804"); 125 timer_base = of_iomap(np, 0); 126 WARN_ON(!timer_base); 127 irq = irq_of_parse_and_map(np, 0); 128 129 highbank_clocks_init(); 130 lookup.clk = of_clk_get(np, 0); 131 clkdev_add(&lookup); 132 133 sp804_clocksource_and_sched_clock_init(timer_base + 0x20, "timer1"); 134 sp804_clockevents_init(timer_base, irq, "timer0"); 135 136 twd_local_timer_of_register(); 137 } 138 139 static struct sys_timer highbank_timer = { 140 .init = highbank_timer_init, 141 }; 142 143 static void highbank_power_off(void) 144 { 145 hignbank_set_pwr_shutdown(); 146 scu_power_mode(scu_base_addr, SCU_PM_POWEROFF); 147 148 while (1) 149 cpu_do_idle(); 150 } 151 152 static void __init highbank_init(void) 153 { 154 pm_power_off = highbank_power_off; 155 156 of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL); 157 } 158 159 static const char *highbank_match[] __initconst = { 160 "calxeda,highbank", 161 NULL, 162 }; 163 164 DT_MACHINE_START(HIGHBANK, "Highbank") 165 .map_io = highbank_map_io, 166 .init_irq = highbank_init_irq, 167 .timer = &highbank_timer, 168 .handle_irq = gic_handle_irq, 169 .init_machine = highbank_init, 170 .dt_compat = highbank_match, 171 .restart = highbank_restart, 172 MACHINE_END 173