1 /* 2 * Copyright 2012 (C), Jason Cooper <jason@lakedaemon.net> 3 * 4 * arch/arm/mach-mvebu/kirkwood.c 5 * 6 * Flattened Device Tree board initialization 7 * 8 * This file is licensed under the terms of the GNU General Public 9 * License version 2. This program is licensed "as is" without any 10 * warranty of any kind, whether express or implied. 11 */ 12 13 #include <linux/clk.h> 14 #include <linux/kernel.h> 15 #include <linux/init.h> 16 #include <linux/mbus.h> 17 #include <linux/of.h> 18 #include <linux/of_address.h> 19 #include <linux/of_net.h> 20 #include <linux/of_platform.h> 21 #include <linux/slab.h> 22 #include <asm/hardware/cache-feroceon-l2.h> 23 #include <asm/mach/arch.h> 24 #include <asm/mach/map.h> 25 #include "kirkwood.h" 26 #include "kirkwood-pm.h" 27 #include "common.h" 28 29 static struct resource kirkwood_cpufreq_resources[] = { 30 [0] = { 31 .start = CPU_CONTROL_PHYS, 32 .end = CPU_CONTROL_PHYS + 3, 33 .flags = IORESOURCE_MEM, 34 }, 35 }; 36 37 static struct platform_device kirkwood_cpufreq_device = { 38 .name = "kirkwood-cpufreq", 39 .id = -1, 40 .num_resources = ARRAY_SIZE(kirkwood_cpufreq_resources), 41 .resource = kirkwood_cpufreq_resources, 42 }; 43 44 static void __init kirkwood_cpufreq_init(void) 45 { 46 platform_device_register(&kirkwood_cpufreq_device); 47 } 48 49 static struct resource kirkwood_cpuidle_resource[] = { 50 { 51 .flags = IORESOURCE_MEM, 52 .start = DDR_OPERATION_BASE, 53 .end = DDR_OPERATION_BASE + 3, 54 }, 55 }; 56 57 static struct platform_device kirkwood_cpuidle = { 58 .name = "kirkwood_cpuidle", 59 .id = -1, 60 .resource = kirkwood_cpuidle_resource, 61 .num_resources = 1, 62 }; 63 64 static void __init kirkwood_cpuidle_init(void) 65 { 66 platform_device_register(&kirkwood_cpuidle); 67 } 68 69 #define MV643XX_ETH_MAC_ADDR_LOW 0x0414 70 #define MV643XX_ETH_MAC_ADDR_HIGH 0x0418 71 72 static void __init kirkwood_dt_eth_fixup(void) 73 { 74 struct device_node *np; 75 76 /* 77 * The ethernet interfaces forget the MAC address assigned by u-boot 78 * if the clocks are turned off. Usually, u-boot on kirkwood boards 79 * has no DT support to properly set local-mac-address property. 80 * As a workaround, we get the MAC address from mv643xx_eth registers 81 * and update the port device node if no valid MAC address is set. 82 */ 83 for_each_compatible_node(np, NULL, "marvell,kirkwood-eth-port") { 84 struct device_node *pnp = of_get_parent(np); 85 struct clk *clk; 86 struct property *pmac; 87 void __iomem *io; 88 u8 *macaddr; 89 u32 reg; 90 91 if (!pnp) 92 continue; 93 94 /* skip disabled nodes or nodes with valid MAC address*/ 95 if (!of_device_is_available(pnp) || 96 !IS_ERR(of_get_mac_address(np))) 97 goto eth_fixup_skip; 98 99 clk = of_clk_get(pnp, 0); 100 if (IS_ERR(clk)) 101 goto eth_fixup_skip; 102 103 io = of_iomap(pnp, 0); 104 if (!io) 105 goto eth_fixup_no_map; 106 107 /* ensure port clock is not gated to not hang CPU */ 108 clk_prepare_enable(clk); 109 110 /* store MAC address register contents in local-mac-address */ 111 pmac = kzalloc(sizeof(*pmac) + 6, GFP_KERNEL); 112 if (!pmac) 113 goto eth_fixup_no_mem; 114 115 pmac->value = pmac + 1; 116 pmac->length = 6; 117 pmac->name = kstrdup("local-mac-address", GFP_KERNEL); 118 if (!pmac->name) { 119 kfree(pmac); 120 goto eth_fixup_no_mem; 121 } 122 123 macaddr = pmac->value; 124 reg = readl(io + MV643XX_ETH_MAC_ADDR_HIGH); 125 macaddr[0] = (reg >> 24) & 0xff; 126 macaddr[1] = (reg >> 16) & 0xff; 127 macaddr[2] = (reg >> 8) & 0xff; 128 macaddr[3] = reg & 0xff; 129 130 reg = readl(io + MV643XX_ETH_MAC_ADDR_LOW); 131 macaddr[4] = (reg >> 8) & 0xff; 132 macaddr[5] = reg & 0xff; 133 134 of_update_property(np, pmac); 135 136 eth_fixup_no_mem: 137 iounmap(io); 138 clk_disable_unprepare(clk); 139 eth_fixup_no_map: 140 clk_put(clk); 141 eth_fixup_skip: 142 of_node_put(pnp); 143 } 144 } 145 146 /* 147 * Disable propagation of mbus errors to the CPU local bus, as this 148 * causes mbus errors (which can occur for example for PCI aborts) to 149 * throw CPU aborts, which we're not set up to deal with. 150 */ 151 static void kirkwood_disable_mbus_error_propagation(void) 152 { 153 void __iomem *cpu_config; 154 155 cpu_config = ioremap(CPU_CONFIG_PHYS, 4); 156 writel(readl(cpu_config) & ~CPU_CONFIG_ERROR_PROP, cpu_config); 157 } 158 159 static struct of_dev_auxdata auxdata[] __initdata = { 160 OF_DEV_AUXDATA("marvell,kirkwood-audio", 0xf10a0000, 161 "mvebu-audio", NULL), 162 { /* sentinel */ } 163 }; 164 165 static void __init kirkwood_dt_init(void) 166 { 167 kirkwood_disable_mbus_error_propagation(); 168 169 BUG_ON(mvebu_mbus_dt_init(false)); 170 171 #ifdef CONFIG_CACHE_FEROCEON_L2 172 feroceon_of_init(); 173 #endif 174 kirkwood_cpufreq_init(); 175 kirkwood_cpuidle_init(); 176 177 kirkwood_pm_init(); 178 kirkwood_dt_eth_fixup(); 179 180 of_platform_default_populate(NULL, auxdata, NULL); 181 } 182 183 static const char * const kirkwood_dt_board_compat[] __initconst = { 184 "marvell,kirkwood", 185 NULL 186 }; 187 188 DT_MACHINE_START(KIRKWOOD_DT, "Marvell Kirkwood (Flattened Device Tree)") 189 /* Maintainer: Jason Cooper <jason@lakedaemon.net> */ 190 .init_machine = kirkwood_dt_init, 191 .restart = mvebu_restart, 192 .dt_compat = kirkwood_dt_board_compat, 193 MACHINE_END 194