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/clocksource.h> 19 #include <linux/dma-mapping.h> 20 #include <linux/input.h> 21 #include <linux/io.h> 22 #include <linux/irqchip.h> 23 #include <linux/mailbox.h> 24 #include <linux/of.h> 25 #include <linux/of_irq.h> 26 #include <linux/of_platform.h> 27 #include <linux/of_address.h> 28 #include <linux/reboot.h> 29 #include <linux/amba/bus.h> 30 #include <linux/platform_device.h> 31 32 #include <asm/psci.h> 33 #include <asm/hardware/cache-l2x0.h> 34 #include <asm/mach/arch.h> 35 #include <asm/mach/map.h> 36 37 #include "core.h" 38 #include "sysregs.h" 39 40 void __iomem *sregs_base; 41 void __iomem *scu_base_addr; 42 43 static void __init highbank_scu_map_io(void) 44 { 45 unsigned long base; 46 47 /* Get SCU base */ 48 asm("mrc p15, 4, %0, c15, c0, 0" : "=r" (base)); 49 50 scu_base_addr = ioremap(base, SZ_4K); 51 } 52 53 54 static void highbank_l2x0_disable(void) 55 { 56 outer_flush_all(); 57 /* Disable PL310 L2 Cache controller */ 58 highbank_smc1(0x102, 0x0); 59 } 60 61 static void __init highbank_init_irq(void) 62 { 63 irqchip_init(); 64 65 if (of_find_compatible_node(NULL, NULL, "arm,cortex-a9")) 66 highbank_scu_map_io(); 67 68 /* Enable PL310 L2 Cache controller */ 69 if (IS_ENABLED(CONFIG_CACHE_L2X0) && 70 of_find_compatible_node(NULL, NULL, "arm,pl310-cache")) { 71 highbank_smc1(0x102, 0x1); 72 l2x0_of_init(0, ~0UL); 73 outer_cache.disable = highbank_l2x0_disable; 74 } 75 } 76 77 static void highbank_power_off(void) 78 { 79 highbank_set_pwr_shutdown(); 80 81 while (1) 82 cpu_do_idle(); 83 } 84 85 static int highbank_platform_notifier(struct notifier_block *nb, 86 unsigned long event, void *__dev) 87 { 88 struct resource *res; 89 int reg = -1; 90 u32 val; 91 struct device *dev = __dev; 92 93 if (event != BUS_NOTIFY_ADD_DEVICE) 94 return NOTIFY_DONE; 95 96 if (of_device_is_compatible(dev->of_node, "calxeda,hb-ahci")) 97 reg = 0xc; 98 else if (of_device_is_compatible(dev->of_node, "calxeda,hb-sdhci")) 99 reg = 0x18; 100 else if (of_device_is_compatible(dev->of_node, "arm,pl330")) 101 reg = 0x20; 102 else if (of_device_is_compatible(dev->of_node, "calxeda,hb-xgmac")) { 103 res = platform_get_resource(to_platform_device(dev), 104 IORESOURCE_MEM, 0); 105 if (res) { 106 if (res->start == 0xfff50000) 107 reg = 0; 108 else if (res->start == 0xfff51000) 109 reg = 4; 110 } 111 } 112 113 if (reg < 0) 114 return NOTIFY_DONE; 115 116 if (of_property_read_bool(dev->of_node, "dma-coherent")) { 117 val = readl(sregs_base + reg); 118 writel(val | 0xff01, sregs_base + reg); 119 set_dma_ops(dev, &arm_coherent_dma_ops); 120 } 121 122 return NOTIFY_OK; 123 } 124 125 static struct notifier_block highbank_amba_nb = { 126 .notifier_call = highbank_platform_notifier, 127 }; 128 129 static struct notifier_block highbank_platform_nb = { 130 .notifier_call = highbank_platform_notifier, 131 }; 132 133 static struct platform_device highbank_cpuidle_device = { 134 .name = "cpuidle-calxeda", 135 }; 136 137 static int hb_keys_notifier(struct notifier_block *nb, unsigned long event, void *data) 138 { 139 u32 key = *(u32 *)data; 140 141 if (event != 0x1000) 142 return 0; 143 144 if (key == KEY_POWER) 145 orderly_poweroff(false); 146 else if (key == 0xffff) 147 ctrl_alt_del(); 148 149 return 0; 150 } 151 static struct notifier_block hb_keys_nb = { 152 .notifier_call = hb_keys_notifier, 153 }; 154 155 static void __init highbank_init(void) 156 { 157 struct device_node *np; 158 159 /* Map system registers */ 160 np = of_find_compatible_node(NULL, NULL, "calxeda,hb-sregs"); 161 sregs_base = of_iomap(np, 0); 162 WARN_ON(!sregs_base); 163 164 pm_power_off = highbank_power_off; 165 highbank_pm_init(); 166 167 bus_register_notifier(&platform_bus_type, &highbank_platform_nb); 168 bus_register_notifier(&amba_bustype, &highbank_amba_nb); 169 170 pl320_ipc_register_notifier(&hb_keys_nb); 171 172 of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL); 173 174 if (psci_ops.cpu_suspend) 175 platform_device_register(&highbank_cpuidle_device); 176 } 177 178 static const char *highbank_match[] __initconst = { 179 "calxeda,highbank", 180 "calxeda,ecx-2000", 181 NULL, 182 }; 183 184 DT_MACHINE_START(HIGHBANK, "Highbank") 185 #if defined(CONFIG_ZONE_DMA) && defined(CONFIG_ARM_LPAE) 186 .dma_zone_size = (4ULL * SZ_1G), 187 #endif 188 .init_irq = highbank_init_irq, 189 .init_machine = highbank_init, 190 .dt_compat = highbank_match, 191 .restart = highbank_restart, 192 MACHINE_END 193