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