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 /* Disable PL310 L2 Cache controller */ 57 highbank_smc1(0x102, 0x0); 58 } 59 60 static void __init highbank_init_irq(void) 61 { 62 irqchip_init(); 63 64 if (of_find_compatible_node(NULL, NULL, "arm,cortex-a9")) 65 highbank_scu_map_io(); 66 67 /* Enable PL310 L2 Cache controller */ 68 if (IS_ENABLED(CONFIG_CACHE_L2X0) && 69 of_find_compatible_node(NULL, NULL, "arm,pl310-cache")) { 70 highbank_smc1(0x102, 0x1); 71 l2x0_of_init(0, ~0UL); 72 outer_cache.disable = highbank_l2x0_disable; 73 } 74 } 75 76 static void highbank_power_off(void) 77 { 78 highbank_set_pwr_shutdown(); 79 80 while (1) 81 cpu_do_idle(); 82 } 83 84 static int highbank_platform_notifier(struct notifier_block *nb, 85 unsigned long event, void *__dev) 86 { 87 struct resource *res; 88 int reg = -1; 89 u32 val; 90 struct device *dev = __dev; 91 92 if (event != BUS_NOTIFY_ADD_DEVICE) 93 return NOTIFY_DONE; 94 95 if (of_device_is_compatible(dev->of_node, "calxeda,hb-ahci")) 96 reg = 0xc; 97 else if (of_device_is_compatible(dev->of_node, "calxeda,hb-sdhci")) 98 reg = 0x18; 99 else if (of_device_is_compatible(dev->of_node, "arm,pl330")) 100 reg = 0x20; 101 else if (of_device_is_compatible(dev->of_node, "calxeda,hb-xgmac")) { 102 res = platform_get_resource(to_platform_device(dev), 103 IORESOURCE_MEM, 0); 104 if (res) { 105 if (res->start == 0xfff50000) 106 reg = 0; 107 else if (res->start == 0xfff51000) 108 reg = 4; 109 } 110 } 111 112 if (reg < 0) 113 return NOTIFY_DONE; 114 115 if (of_property_read_bool(dev->of_node, "dma-coherent")) { 116 val = readl(sregs_base + reg); 117 writel(val | 0xff01, sregs_base + reg); 118 set_dma_ops(dev, &arm_coherent_dma_ops); 119 } 120 121 return NOTIFY_OK; 122 } 123 124 static struct notifier_block highbank_amba_nb = { 125 .notifier_call = highbank_platform_notifier, 126 }; 127 128 static struct notifier_block highbank_platform_nb = { 129 .notifier_call = highbank_platform_notifier, 130 }; 131 132 static struct platform_device highbank_cpuidle_device = { 133 .name = "cpuidle-calxeda", 134 }; 135 136 static int hb_keys_notifier(struct notifier_block *nb, unsigned long event, void *data) 137 { 138 u32 key = *(u32 *)data; 139 140 if (event != 0x1000) 141 return 0; 142 143 if (key == KEY_POWER) 144 orderly_poweroff(false); 145 else if (key == 0xffff) 146 ctrl_alt_del(); 147 148 return 0; 149 } 150 static struct notifier_block hb_keys_nb = { 151 .notifier_call = hb_keys_notifier, 152 }; 153 154 static void __init highbank_init(void) 155 { 156 struct device_node *np; 157 158 /* Map system registers */ 159 np = of_find_compatible_node(NULL, NULL, "calxeda,hb-sregs"); 160 sregs_base = of_iomap(np, 0); 161 WARN_ON(!sregs_base); 162 163 pm_power_off = highbank_power_off; 164 highbank_pm_init(); 165 166 bus_register_notifier(&platform_bus_type, &highbank_platform_nb); 167 bus_register_notifier(&amba_bustype, &highbank_amba_nb); 168 169 pl320_ipc_register_notifier(&hb_keys_nb); 170 171 of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL); 172 173 if (psci_ops.cpu_suspend) 174 platform_device_register(&highbank_cpuidle_device); 175 } 176 177 static const char *highbank_match[] __initconst = { 178 "calxeda,highbank", 179 "calxeda,ecx-2000", 180 NULL, 181 }; 182 183 DT_MACHINE_START(HIGHBANK, "Highbank") 184 #if defined(CONFIG_ZONE_DMA) && defined(CONFIG_ARM_LPAE) 185 .dma_zone_size = (4ULL * SZ_1G), 186 #endif 187 .init_irq = highbank_init_irq, 188 .init_machine = highbank_init, 189 .dt_compat = highbank_match, 190 .restart = highbank_restart, 191 MACHINE_END 192