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 26 #include <asm/cacheflush.h> 27 #include <asm/unified.h> 28 #include <asm/smp_scu.h> 29 #include <asm/hardware/arm_timer.h> 30 #include <asm/hardware/timer-sp.h> 31 #include <asm/hardware/gic.h> 32 #include <asm/hardware/cache-l2x0.h> 33 #include <asm/mach/arch.h> 34 #include <asm/mach/map.h> 35 #include <asm/mach/time.h> 36 #include <mach/irqs.h> 37 38 #include "core.h" 39 #include "sysregs.h" 40 41 void __iomem *sregs_base; 42 43 #define HB_SCU_VIRT_BASE 0xfee00000 44 void __iomem *scu_base_addr = ((void __iomem *)(HB_SCU_VIRT_BASE)); 45 46 static struct map_desc scu_io_desc __initdata = { 47 .virtual = HB_SCU_VIRT_BASE, 48 .pfn = 0, /* run-time */ 49 .length = SZ_4K, 50 .type = MT_DEVICE, 51 }; 52 53 static void __init highbank_scu_map_io(void) 54 { 55 unsigned long base; 56 57 /* Get SCU base */ 58 asm("mrc p15, 4, %0, c15, c0, 0" : "=r" (base)); 59 60 scu_io_desc.pfn = __phys_to_pfn(base); 61 iotable_init(&scu_io_desc, 1); 62 } 63 64 static void __init highbank_map_io(void) 65 { 66 highbank_scu_map_io(); 67 highbank_lluart_map_io(); 68 } 69 70 #define HB_JUMP_TABLE_PHYS(cpu) (0x40 + (0x10 * (cpu))) 71 #define HB_JUMP_TABLE_VIRT(cpu) phys_to_virt(HB_JUMP_TABLE_PHYS(cpu)) 72 73 void highbank_set_cpu_jump(int cpu, void *jump_addr) 74 { 75 writel(BSYM(virt_to_phys(jump_addr)), HB_JUMP_TABLE_VIRT(cpu)); 76 __cpuc_flush_dcache_area(HB_JUMP_TABLE_VIRT(cpu), 16); 77 outer_clean_range(HB_JUMP_TABLE_PHYS(cpu), 78 HB_JUMP_TABLE_PHYS(cpu) + 15); 79 } 80 81 const static struct of_device_id irq_match[] = { 82 { .compatible = "arm,cortex-a9-gic", .data = gic_of_init, }, 83 {} 84 }; 85 86 static void __init highbank_init_irq(void) 87 { 88 of_irq_init(irq_match); 89 l2x0_of_init(0, ~0UL); 90 } 91 92 static void __init highbank_timer_init(void) 93 { 94 int irq; 95 struct device_node *np; 96 void __iomem *timer_base; 97 98 /* Map system registers */ 99 np = of_find_compatible_node(NULL, NULL, "calxeda,hb-sregs"); 100 sregs_base = of_iomap(np, 0); 101 WARN_ON(!sregs_base); 102 103 np = of_find_compatible_node(NULL, NULL, "arm,sp804"); 104 timer_base = of_iomap(np, 0); 105 WARN_ON(!timer_base); 106 irq = irq_of_parse_and_map(np, 0); 107 108 highbank_clocks_init(); 109 110 sp804_clocksource_init(timer_base + 0x20, "timer1"); 111 sp804_clockevents_init(timer_base, irq, "timer0"); 112 } 113 114 static struct sys_timer highbank_timer = { 115 .init = highbank_timer_init, 116 }; 117 118 static void highbank_power_off(void) 119 { 120 hignbank_set_pwr_shutdown(); 121 scu_power_mode(scu_base_addr, SCU_PM_POWEROFF); 122 123 while (1) 124 cpu_do_idle(); 125 } 126 127 static void __init highbank_init(void) 128 { 129 pm_power_off = highbank_power_off; 130 131 of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL); 132 } 133 134 static const char *highbank_match[] __initconst = { 135 "calxeda,highbank", 136 NULL, 137 }; 138 139 DT_MACHINE_START(HIGHBANK, "Highbank") 140 .map_io = highbank_map_io, 141 .init_irq = highbank_init_irq, 142 .timer = &highbank_timer, 143 .init_machine = highbank_init, 144 .dt_compat = highbank_match, 145 MACHINE_END 146