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/pl320-ipc.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_l2c310_write_sec(unsigned long val, unsigned reg) 55 { 56 if (reg == L2X0_CTRL) 57 highbank_smc1(0x102, val); 58 else 59 WARN_ONCE(1, "Highbank L2C310: ignoring write to reg 0x%x\n", 60 reg); 61 } 62 63 static void __init highbank_init_irq(void) 64 { 65 irqchip_init(); 66 67 if (of_find_compatible_node(NULL, NULL, "arm,cortex-a9")) 68 highbank_scu_map_io(); 69 } 70 71 static void highbank_power_off(void) 72 { 73 highbank_set_pwr_shutdown(); 74 75 while (1) 76 cpu_do_idle(); 77 } 78 79 static int highbank_platform_notifier(struct notifier_block *nb, 80 unsigned long event, void *__dev) 81 { 82 struct resource *res; 83 int reg = -1; 84 u32 val; 85 struct device *dev = __dev; 86 87 if (event != BUS_NOTIFY_ADD_DEVICE) 88 return NOTIFY_DONE; 89 90 if (of_device_is_compatible(dev->of_node, "calxeda,hb-ahci")) 91 reg = 0xc; 92 else if (of_device_is_compatible(dev->of_node, "calxeda,hb-sdhci")) 93 reg = 0x18; 94 else if (of_device_is_compatible(dev->of_node, "arm,pl330")) 95 reg = 0x20; 96 else if (of_device_is_compatible(dev->of_node, "calxeda,hb-xgmac")) { 97 res = platform_get_resource(to_platform_device(dev), 98 IORESOURCE_MEM, 0); 99 if (res) { 100 if (res->start == 0xfff50000) 101 reg = 0; 102 else if (res->start == 0xfff51000) 103 reg = 4; 104 } 105 } 106 107 if (reg < 0) 108 return NOTIFY_DONE; 109 110 if (of_property_read_bool(dev->of_node, "dma-coherent")) { 111 val = readl(sregs_base + reg); 112 writel(val | 0xff01, sregs_base + reg); 113 set_dma_ops(dev, &arm_coherent_dma_ops); 114 } 115 116 return NOTIFY_OK; 117 } 118 119 static struct notifier_block highbank_amba_nb = { 120 .notifier_call = highbank_platform_notifier, 121 }; 122 123 static struct notifier_block highbank_platform_nb = { 124 .notifier_call = highbank_platform_notifier, 125 }; 126 127 static struct platform_device highbank_cpuidle_device = { 128 .name = "cpuidle-calxeda", 129 }; 130 131 static int hb_keys_notifier(struct notifier_block *nb, unsigned long event, void *data) 132 { 133 u32 key = *(u32 *)data; 134 135 if (event != 0x1000) 136 return 0; 137 138 if (key == KEY_POWER) 139 orderly_poweroff(false); 140 else if (key == 0xffff) 141 ctrl_alt_del(); 142 143 return 0; 144 } 145 static struct notifier_block hb_keys_nb = { 146 .notifier_call = hb_keys_notifier, 147 }; 148 149 static void __init highbank_init(void) 150 { 151 struct device_node *np; 152 153 /* Map system registers */ 154 np = of_find_compatible_node(NULL, NULL, "calxeda,hb-sregs"); 155 sregs_base = of_iomap(np, 0); 156 WARN_ON(!sregs_base); 157 158 pm_power_off = highbank_power_off; 159 highbank_pm_init(); 160 161 bus_register_notifier(&platform_bus_type, &highbank_platform_nb); 162 bus_register_notifier(&amba_bustype, &highbank_amba_nb); 163 164 pl320_ipc_register_notifier(&hb_keys_nb); 165 166 of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL); 167 168 if (psci_ops.cpu_suspend) 169 platform_device_register(&highbank_cpuidle_device); 170 } 171 172 static const char *const highbank_match[] __initconst = { 173 "calxeda,highbank", 174 "calxeda,ecx-2000", 175 NULL, 176 }; 177 178 DT_MACHINE_START(HIGHBANK, "Highbank") 179 #if defined(CONFIG_ZONE_DMA) && defined(CONFIG_ARM_LPAE) 180 .dma_zone_size = (4ULL * SZ_1G), 181 #endif 182 .l2c_aux_val = 0, 183 .l2c_aux_mask = ~0, 184 .l2c_write_sec = highbank_l2c310_write_sec, 185 .init_irq = highbank_init_irq, 186 .init_machine = highbank_init, 187 .dt_compat = highbank_match, 188 .restart = highbank_restart, 189 MACHINE_END 190