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 u8 tmpmac[ETH_ALEN]; 88 void __iomem *io; 89 u8 *macaddr; 90 u32 reg; 91 92 if (!pnp) 93 continue; 94 95 /* skip disabled nodes or nodes with valid MAC address*/ 96 if (!of_device_is_available(pnp) || 97 !of_get_mac_address(np, tmpmac)) 98 goto eth_fixup_skip; 99 100 clk = of_clk_get(pnp, 0); 101 if (IS_ERR(clk)) 102 goto eth_fixup_skip; 103 104 io = of_iomap(pnp, 0); 105 if (!io) 106 goto eth_fixup_no_map; 107 108 /* ensure port clock is not gated to not hang CPU */ 109 clk_prepare_enable(clk); 110 111 /* store MAC address register contents in local-mac-address */ 112 pmac = kzalloc(sizeof(*pmac) + 6, GFP_KERNEL); 113 if (!pmac) 114 goto eth_fixup_no_mem; 115 116 pmac->value = pmac + 1; 117 pmac->length = 6; 118 pmac->name = kstrdup("local-mac-address", GFP_KERNEL); 119 if (!pmac->name) { 120 kfree(pmac); 121 goto eth_fixup_no_mem; 122 } 123 124 macaddr = pmac->value; 125 reg = readl(io + MV643XX_ETH_MAC_ADDR_HIGH); 126 macaddr[0] = (reg >> 24) & 0xff; 127 macaddr[1] = (reg >> 16) & 0xff; 128 macaddr[2] = (reg >> 8) & 0xff; 129 macaddr[3] = reg & 0xff; 130 131 reg = readl(io + MV643XX_ETH_MAC_ADDR_LOW); 132 macaddr[4] = (reg >> 8) & 0xff; 133 macaddr[5] = reg & 0xff; 134 135 of_update_property(np, pmac); 136 137 eth_fixup_no_mem: 138 iounmap(io); 139 clk_disable_unprepare(clk); 140 eth_fixup_no_map: 141 clk_put(clk); 142 eth_fixup_skip: 143 of_node_put(pnp); 144 } 145 } 146 147 /* 148 * Disable propagation of mbus errors to the CPU local bus, as this 149 * causes mbus errors (which can occur for example for PCI aborts) to 150 * throw CPU aborts, which we're not set up to deal with. 151 */ 152 static void kirkwood_disable_mbus_error_propagation(void) 153 { 154 void __iomem *cpu_config; 155 156 cpu_config = ioremap(CPU_CONFIG_PHYS, 4); 157 writel(readl(cpu_config) & ~CPU_CONFIG_ERROR_PROP, cpu_config); 158 } 159 160 static struct of_dev_auxdata auxdata[] __initdata = { 161 OF_DEV_AUXDATA("marvell,kirkwood-audio", 0xf10a0000, 162 "mvebu-audio", NULL), 163 { /* sentinel */ } 164 }; 165 166 static void __init kirkwood_dt_init(void) 167 { 168 kirkwood_disable_mbus_error_propagation(); 169 170 BUG_ON(mvebu_mbus_dt_init(false)); 171 172 #ifdef CONFIG_CACHE_FEROCEON_L2 173 feroceon_of_init(); 174 #endif 175 kirkwood_cpufreq_init(); 176 kirkwood_cpuidle_init(); 177 178 kirkwood_pm_init(); 179 kirkwood_dt_eth_fixup(); 180 181 of_platform_default_populate(NULL, auxdata, NULL); 182 } 183 184 static const char * const kirkwood_dt_board_compat[] __initconst = { 185 "marvell,kirkwood", 186 NULL 187 }; 188 189 DT_MACHINE_START(KIRKWOOD_DT, "Marvell Kirkwood (Flattened Device Tree)") 190 /* Maintainer: Jason Cooper <jason@lakedaemon.net> */ 191 .init_machine = kirkwood_dt_init, 192 .restart = mvebu_restart, 193 .dt_compat = kirkwood_dt_board_compat, 194 MACHINE_END 195