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) || of_get_mac_address(np)) 96 goto eth_fixup_skip; 97 98 clk = of_clk_get(pnp, 0); 99 if (IS_ERR(clk)) 100 goto eth_fixup_skip; 101 102 io = of_iomap(pnp, 0); 103 if (!io) 104 goto eth_fixup_no_map; 105 106 /* ensure port clock is not gated to not hang CPU */ 107 clk_prepare_enable(clk); 108 109 /* store MAC address register contents in local-mac-address */ 110 pr_err(FW_INFO "%s: local-mac-address is not set\n", 111 np->full_name); 112 113 pmac = kzalloc(sizeof(*pmac) + 6, GFP_KERNEL); 114 if (!pmac) 115 goto eth_fixup_no_mem; 116 117 pmac->value = pmac + 1; 118 pmac->length = 6; 119 pmac->name = kstrdup("local-mac-address", GFP_KERNEL); 120 if (!pmac->name) { 121 kfree(pmac); 122 goto eth_fixup_no_mem; 123 } 124 125 macaddr = pmac->value; 126 reg = readl(io + MV643XX_ETH_MAC_ADDR_HIGH); 127 macaddr[0] = (reg >> 24) & 0xff; 128 macaddr[1] = (reg >> 16) & 0xff; 129 macaddr[2] = (reg >> 8) & 0xff; 130 macaddr[3] = reg & 0xff; 131 132 reg = readl(io + MV643XX_ETH_MAC_ADDR_LOW); 133 macaddr[4] = (reg >> 8) & 0xff; 134 macaddr[5] = reg & 0xff; 135 136 of_update_property(np, pmac); 137 138 eth_fixup_no_mem: 139 iounmap(io); 140 clk_disable_unprepare(clk); 141 eth_fixup_no_map: 142 clk_put(clk); 143 eth_fixup_skip: 144 of_node_put(pnp); 145 } 146 } 147 148 /* 149 * Disable propagation of mbus errors to the CPU local bus, as this 150 * causes mbus errors (which can occur for example for PCI aborts) to 151 * throw CPU aborts, which we're not set up to deal with. 152 */ 153 void kirkwood_disable_mbus_error_propagation(void) 154 { 155 void __iomem *cpu_config; 156 157 cpu_config = ioremap(CPU_CONFIG_PHYS, 4); 158 writel(readl(cpu_config) & ~CPU_CONFIG_ERROR_PROP, cpu_config); 159 } 160 161 static struct of_dev_auxdata auxdata[] __initdata = { 162 OF_DEV_AUXDATA("marvell,kirkwood-audio", 0xf10a0000, 163 "mvebu-audio", NULL), 164 { /* sentinel */ } 165 }; 166 167 static void __init kirkwood_dt_init(void) 168 { 169 kirkwood_disable_mbus_error_propagation(); 170 171 BUG_ON(mvebu_mbus_dt_init(false)); 172 173 #ifdef CONFIG_CACHE_FEROCEON_L2 174 feroceon_of_init(); 175 #endif 176 kirkwood_cpufreq_init(); 177 kirkwood_cpuidle_init(); 178 179 kirkwood_pm_init(); 180 kirkwood_dt_eth_fixup(); 181 182 of_platform_populate(NULL, of_default_bus_match_table, auxdata, NULL); 183 } 184 185 static const char * const kirkwood_dt_board_compat[] __initconst = { 186 "marvell,kirkwood", 187 NULL 188 }; 189 190 DT_MACHINE_START(KIRKWOOD_DT, "Marvell Kirkwood (Flattened Device Tree)") 191 /* Maintainer: Jason Cooper <jason@lakedaemon.net> */ 192 .init_machine = kirkwood_dt_init, 193 .restart = mvebu_restart, 194 .dt_compat = kirkwood_dt_board_compat, 195 MACHINE_END 196