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_address.h> 27 #include <linux/reboot.h> 28 #include <linux/amba/bus.h> 29 #include <linux/platform_device.h> 30 #include <linux/psci.h> 31 32 #include <asm/hardware/cache-l2x0.h> 33 #include <asm/mach/arch.h> 34 #include <asm/mach/map.h> 35 36 #include "core.h" 37 #include "sysregs.h" 38 39 void __iomem *sregs_base; 40 void __iomem *scu_base_addr; 41 42 static void __init highbank_scu_map_io(void) 43 { 44 unsigned long base; 45 46 /* Get SCU base */ 47 asm("mrc p15, 4, %0, c15, c0, 0" : "=r" (base)); 48 49 scu_base_addr = ioremap(base, SZ_4K); 50 } 51 52 53 static void highbank_l2c310_write_sec(unsigned long val, unsigned reg) 54 { 55 if (reg == L2X0_CTRL) 56 highbank_smc1(0x102, val); 57 else 58 WARN_ONCE(1, "Highbank L2C310: ignoring write to reg 0x%x\n", 59 reg); 60 } 61 62 static void __init highbank_init_irq(void) 63 { 64 irqchip_init(); 65 66 if (of_find_compatible_node(NULL, NULL, "arm,cortex-a9")) 67 highbank_scu_map_io(); 68 } 69 70 static void highbank_power_off(void) 71 { 72 highbank_set_pwr_shutdown(); 73 74 while (1) 75 cpu_do_idle(); 76 } 77 78 static int highbank_platform_notifier(struct notifier_block *nb, 79 unsigned long event, void *__dev) 80 { 81 struct resource *res; 82 int reg = -1; 83 u32 val; 84 struct device *dev = __dev; 85 86 if (event != BUS_NOTIFY_ADD_DEVICE) 87 return NOTIFY_DONE; 88 89 if (of_device_is_compatible(dev->of_node, "calxeda,hb-ahci")) 90 reg = 0xc; 91 else if (of_device_is_compatible(dev->of_node, "calxeda,hb-sdhci")) 92 reg = 0x18; 93 else if (of_device_is_compatible(dev->of_node, "arm,pl330")) 94 reg = 0x20; 95 else if (of_device_is_compatible(dev->of_node, "calxeda,hb-xgmac")) { 96 res = platform_get_resource(to_platform_device(dev), 97 IORESOURCE_MEM, 0); 98 if (res) { 99 if (res->start == 0xfff50000) 100 reg = 0; 101 else if (res->start == 0xfff51000) 102 reg = 4; 103 } 104 } 105 106 if (reg < 0) 107 return NOTIFY_DONE; 108 109 if (of_property_read_bool(dev->of_node, "dma-coherent")) { 110 val = readl(sregs_base + reg); 111 writel(val | 0xff01, sregs_base + reg); 112 set_dma_ops(dev, &arm_coherent_dma_ops); 113 } 114 115 return NOTIFY_OK; 116 } 117 118 static struct notifier_block highbank_amba_nb = { 119 .notifier_call = highbank_platform_notifier, 120 }; 121 122 static struct notifier_block highbank_platform_nb = { 123 .notifier_call = highbank_platform_notifier, 124 }; 125 126 static struct platform_device highbank_cpuidle_device = { 127 .name = "cpuidle-calxeda", 128 }; 129 130 static int hb_keys_notifier(struct notifier_block *nb, unsigned long event, void *data) 131 { 132 u32 key = *(u32 *)data; 133 134 if (event != 0x1000) 135 return 0; 136 137 if (key == KEY_POWER) 138 orderly_poweroff(false); 139 else if (key == 0xffff) 140 ctrl_alt_del(); 141 142 return 0; 143 } 144 static struct notifier_block hb_keys_nb = { 145 .notifier_call = hb_keys_notifier, 146 }; 147 148 static void __init highbank_init(void) 149 { 150 struct device_node *np; 151 152 /* Map system registers */ 153 np = of_find_compatible_node(NULL, NULL, "calxeda,hb-sregs"); 154 sregs_base = of_iomap(np, 0); 155 WARN_ON(!sregs_base); 156 157 pm_power_off = highbank_power_off; 158 highbank_pm_init(); 159 160 bus_register_notifier(&platform_bus_type, &highbank_platform_nb); 161 bus_register_notifier(&amba_bustype, &highbank_amba_nb); 162 163 pl320_ipc_register_notifier(&hb_keys_nb); 164 165 if (psci_ops.cpu_suspend) 166 platform_device_register(&highbank_cpuidle_device); 167 } 168 169 static const char *const highbank_match[] __initconst = { 170 "calxeda,highbank", 171 "calxeda,ecx-2000", 172 NULL, 173 }; 174 175 DT_MACHINE_START(HIGHBANK, "Highbank") 176 #if defined(CONFIG_ZONE_DMA) && defined(CONFIG_ARM_LPAE) 177 .dma_zone_size = (4ULL * SZ_1G), 178 #endif 179 .l2c_aux_val = 0, 180 .l2c_aux_mask = ~0, 181 .l2c_write_sec = highbank_l2c310_write_sec, 182 .init_irq = highbank_init_irq, 183 .init_machine = highbank_init, 184 .dt_compat = highbank_match, 185 .restart = highbank_restart, 186 MACHINE_END 187