1 /* 2 * Copyright (C) 2012 Altera Corporation 3 * 4 * This program is free software; you can redistribute it and/or modify 5 * it under the terms of the GNU General Public License as published by 6 * the Free Software Foundation; either version 2 of the License, or 7 * (at your option) any later version. 8 * 9 * This program is distributed in the hope that it will be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 * GNU General Public License for more details. 13 * 14 * You should have received a copy of the GNU General Public License 15 * along with this program. If not, see <http://www.gnu.org/licenses/>. 16 */ 17 #include <linux/irqchip.h> 18 #include <linux/of_address.h> 19 #include <linux/of_irq.h> 20 #include <linux/of_platform.h> 21 #include <linux/reboot.h> 22 23 #include <asm/hardware/cache-l2x0.h> 24 #include <asm/mach/arch.h> 25 #include <asm/mach/map.h> 26 #include <asm/cacheflush.h> 27 28 #include "core.h" 29 30 void __iomem *socfpga_scu_base_addr = ((void __iomem *)(SOCFPGA_SCU_VIRT_BASE)); 31 void __iomem *sys_manager_base_addr; 32 void __iomem *rst_manager_base_addr; 33 unsigned long socfpga_cpu1start_addr; 34 35 static struct map_desc scu_io_desc __initdata = { 36 .virtual = SOCFPGA_SCU_VIRT_BASE, 37 .pfn = 0, /* run-time */ 38 .length = SZ_8K, 39 .type = MT_DEVICE, 40 }; 41 42 static struct map_desc uart_io_desc __initdata = { 43 .virtual = 0xfec02000, 44 .pfn = __phys_to_pfn(0xffc02000), 45 .length = SZ_8K, 46 .type = MT_DEVICE, 47 }; 48 49 static void __init socfpga_scu_map_io(void) 50 { 51 unsigned long base; 52 53 /* Get SCU base */ 54 asm("mrc p15, 4, %0, c15, c0, 0" : "=r" (base)); 55 56 scu_io_desc.pfn = __phys_to_pfn(base); 57 iotable_init(&scu_io_desc, 1); 58 } 59 60 static void __init socfpga_map_io(void) 61 { 62 socfpga_scu_map_io(); 63 iotable_init(&uart_io_desc, 1); 64 early_printk("Early printk initialized\n"); 65 } 66 67 void __init socfpga_sysmgr_init(void) 68 { 69 struct device_node *np; 70 71 np = of_find_compatible_node(NULL, NULL, "altr,sys-mgr"); 72 73 if (of_property_read_u32(np, "cpu1-start-addr", 74 (u32 *) &socfpga_cpu1start_addr)) 75 pr_err("SMP: Need cpu1-start-addr in device tree.\n"); 76 77 /* Ensure that socfpga_cpu1start_addr is visible to other CPUs */ 78 smp_wmb(); 79 sync_cache_w(&socfpga_cpu1start_addr); 80 81 sys_manager_base_addr = of_iomap(np, 0); 82 83 np = of_find_compatible_node(NULL, NULL, "altr,rst-mgr"); 84 rst_manager_base_addr = of_iomap(np, 0); 85 } 86 87 static void __init socfpga_init_irq(void) 88 { 89 irqchip_init(); 90 socfpga_sysmgr_init(); 91 } 92 93 static void socfpga_cyclone5_restart(enum reboot_mode mode, const char *cmd) 94 { 95 u32 temp; 96 97 temp = readl(rst_manager_base_addr + SOCFPGA_RSTMGR_CTRL); 98 99 if (mode == REBOOT_HARD) 100 temp |= RSTMGR_CTRL_SWCOLDRSTREQ; 101 else 102 temp |= RSTMGR_CTRL_SWWARMRSTREQ; 103 writel(temp, rst_manager_base_addr + SOCFPGA_RSTMGR_CTRL); 104 } 105 106 static const char *altera_dt_match[] = { 107 "altr,socfpga", 108 NULL 109 }; 110 111 DT_MACHINE_START(SOCFPGA, "Altera SOCFPGA") 112 .l2c_aux_val = 0, 113 .l2c_aux_mask = ~0, 114 .smp = smp_ops(socfpga_smp_ops), 115 .map_io = socfpga_map_io, 116 .init_irq = socfpga_init_irq, 117 .restart = socfpga_cyclone5_restart, 118 .dt_compat = altera_dt_match, 119 MACHINE_END 120