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 static void __init highbank_init_irq(void) 89 { 90 of_irq_init(irq_match); 91 l2x0_of_init(0, ~0UL); 92 } 93 94 static void __init highbank_timer_init(void) 95 { 96 int irq; 97 struct device_node *np; 98 void __iomem *timer_base; 99 100 /* Map system registers */ 101 np = of_find_compatible_node(NULL, NULL, "calxeda,hb-sregs"); 102 sregs_base = of_iomap(np, 0); 103 WARN_ON(!sregs_base); 104 105 np = of_find_compatible_node(NULL, NULL, "arm,sp804"); 106 timer_base = of_iomap(np, 0); 107 WARN_ON(!timer_base); 108 irq = irq_of_parse_and_map(np, 0); 109 110 highbank_clocks_init(); 111 112 sp804_clocksource_and_sched_clock_init(timer_base + 0x20, "timer1"); 113 sp804_clockevents_init(timer_base, irq, "timer0"); 114 115 twd_local_timer_of_register(); 116 } 117 118 static struct sys_timer highbank_timer = { 119 .init = highbank_timer_init, 120 }; 121 122 static void highbank_power_off(void) 123 { 124 hignbank_set_pwr_shutdown(); 125 scu_power_mode(scu_base_addr, SCU_PM_POWEROFF); 126 127 while (1) 128 cpu_do_idle(); 129 } 130 131 static void __init highbank_init(void) 132 { 133 pm_power_off = highbank_power_off; 134 135 of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL); 136 } 137 138 static const char *highbank_match[] __initconst = { 139 "calxeda,highbank", 140 NULL, 141 }; 142 143 DT_MACHINE_START(HIGHBANK, "Highbank") 144 .map_io = highbank_map_io, 145 .init_irq = highbank_init_irq, 146 .timer = &highbank_timer, 147 .handle_irq = gic_handle_irq, 148 .init_machine = highbank_init, 149 .dt_compat = highbank_match, 150 .restart = highbank_restart, 151 MACHINE_END 152