1 /* 2 * This file contains common code that is intended to be used across 3 * boards so that it's not replicated. 4 * 5 * Copyright (C) 2011 Xilinx 6 * 7 * This software is licensed under the terms of the GNU General Public 8 * License version 2, as published by the Free Software Foundation, and 9 * may be copied, distributed, and modified under those terms. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 */ 16 17 #include <linux/init.h> 18 #include <linux/kernel.h> 19 #include <linux/cpumask.h> 20 #include <linux/platform_device.h> 21 #include <linux/clk.h> 22 #include <linux/clk/zynq.h> 23 #include <linux/clocksource.h> 24 #include <linux/of_address.h> 25 #include <linux/of_irq.h> 26 #include <linux/of_platform.h> 27 #include <linux/of.h> 28 #include <linux/memblock.h> 29 #include <linux/irqchip.h> 30 #include <linux/irqchip/arm-gic.h> 31 32 #include <asm/mach/arch.h> 33 #include <asm/mach/map.h> 34 #include <asm/mach/time.h> 35 #include <asm/mach-types.h> 36 #include <asm/page.h> 37 #include <asm/pgtable.h> 38 #include <asm/smp_scu.h> 39 #include <asm/hardware/cache-l2x0.h> 40 41 #include "common.h" 42 43 void __iomem *zynq_scu_base; 44 45 /** 46 * zynq_memory_init - Initialize special memory 47 * 48 * We need to stop things allocating the low memory as DMA can't work in 49 * the 1st 512K of memory. 50 */ 51 static void __init zynq_memory_init(void) 52 { 53 if (!__pa(PAGE_OFFSET)) 54 memblock_reserve(__pa(PAGE_OFFSET), __pa(swapper_pg_dir)); 55 } 56 57 static struct platform_device zynq_cpuidle_device = { 58 .name = "cpuidle-zynq", 59 }; 60 61 /** 62 * zynq_init_machine - System specific initialization, intended to be 63 * called from board specific initialization. 64 */ 65 static void __init zynq_init_machine(void) 66 { 67 /* 68 * 64KB way size, 8-way associativity, parity disabled 69 */ 70 l2x0_of_init(0x02060000, 0xF0F0FFFF); 71 72 of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL); 73 74 platform_device_register(&zynq_cpuidle_device); 75 } 76 77 static void __init zynq_timer_init(void) 78 { 79 zynq_slcr_init(); 80 clocksource_of_init(); 81 } 82 83 static struct map_desc zynq_cortex_a9_scu_map __initdata = { 84 .length = SZ_256, 85 .type = MT_DEVICE, 86 }; 87 88 static void __init zynq_scu_map_io(void) 89 { 90 unsigned long base; 91 92 base = scu_a9_get_base(); 93 zynq_cortex_a9_scu_map.pfn = __phys_to_pfn(base); 94 /* Expected address is in vmalloc area that's why simple assign here */ 95 zynq_cortex_a9_scu_map.virtual = base; 96 iotable_init(&zynq_cortex_a9_scu_map, 1); 97 zynq_scu_base = (void __iomem *)base; 98 BUG_ON(!zynq_scu_base); 99 } 100 101 /** 102 * zynq_map_io - Create memory mappings needed for early I/O. 103 */ 104 static void __init zynq_map_io(void) 105 { 106 debug_ll_io_init(); 107 zynq_scu_map_io(); 108 } 109 110 static void __init zynq_irq_init(void) 111 { 112 gic_arch_extn.flags = IRQCHIP_SKIP_SET_WAKE | IRQCHIP_MASK_ON_SUSPEND; 113 irqchip_init(); 114 } 115 116 static void zynq_system_reset(enum reboot_mode mode, const char *cmd) 117 { 118 zynq_slcr_system_reset(); 119 } 120 121 static const char * const zynq_dt_match[] = { 122 "xlnx,zynq-7000", 123 NULL 124 }; 125 126 DT_MACHINE_START(XILINX_EP107, "Xilinx Zynq Platform") 127 .smp = smp_ops(zynq_smp_ops), 128 .map_io = zynq_map_io, 129 .init_irq = zynq_irq_init, 130 .init_machine = zynq_init_machine, 131 .init_time = zynq_timer_init, 132 .dt_compat = zynq_dt_match, 133 .reserve = zynq_memory_init, 134 .restart = zynq_system_reset, 135 MACHINE_END 136