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 #include "board.h" 29 30 static struct resource kirkwood_cpufreq_resources[] = { 31 [0] = { 32 .start = CPU_CONTROL_PHYS, 33 .end = CPU_CONTROL_PHYS + 3, 34 .flags = IORESOURCE_MEM, 35 }, 36 }; 37 38 static struct platform_device kirkwood_cpufreq_device = { 39 .name = "kirkwood-cpufreq", 40 .id = -1, 41 .num_resources = ARRAY_SIZE(kirkwood_cpufreq_resources), 42 .resource = kirkwood_cpufreq_resources, 43 }; 44 45 static void __init kirkwood_cpufreq_init(void) 46 { 47 platform_device_register(&kirkwood_cpufreq_device); 48 } 49 50 static struct resource kirkwood_cpuidle_resource[] = { 51 { 52 .flags = IORESOURCE_MEM, 53 .start = DDR_OPERATION_BASE, 54 .end = DDR_OPERATION_BASE + 3, 55 }, 56 }; 57 58 static struct platform_device kirkwood_cpuidle = { 59 .name = "kirkwood_cpuidle", 60 .id = -1, 61 .resource = kirkwood_cpuidle_resource, 62 .num_resources = 1, 63 }; 64 65 static void __init kirkwood_cpuidle_init(void) 66 { 67 platform_device_register(&kirkwood_cpuidle); 68 } 69 70 #define MV643XX_ETH_MAC_ADDR_LOW 0x0414 71 #define MV643XX_ETH_MAC_ADDR_HIGH 0x0418 72 73 static void __init kirkwood_dt_eth_fixup(void) 74 { 75 struct device_node *np; 76 77 /* 78 * The ethernet interfaces forget the MAC address assigned by u-boot 79 * if the clocks are turned off. Usually, u-boot on kirkwood boards 80 * has no DT support to properly set local-mac-address property. 81 * As a workaround, we get the MAC address from mv643xx_eth registers 82 * and update the port device node if no valid MAC address is set. 83 */ 84 for_each_compatible_node(np, NULL, "marvell,kirkwood-eth-port") { 85 struct device_node *pnp = of_get_parent(np); 86 struct clk *clk; 87 struct property *pmac; 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) || 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 pr_err(FW_INFO "%s: local-mac-address is not set\n", 112 np->full_name); 113 114 pmac = kzalloc(sizeof(*pmac) + 6, GFP_KERNEL); 115 if (!pmac) 116 goto eth_fixup_no_mem; 117 118 pmac->value = pmac + 1; 119 pmac->length = 6; 120 pmac->name = kstrdup("local-mac-address", GFP_KERNEL); 121 if (!pmac->name) { 122 kfree(pmac); 123 goto eth_fixup_no_mem; 124 } 125 126 macaddr = pmac->value; 127 reg = readl(io + MV643XX_ETH_MAC_ADDR_HIGH); 128 macaddr[0] = (reg >> 24) & 0xff; 129 macaddr[1] = (reg >> 16) & 0xff; 130 macaddr[2] = (reg >> 8) & 0xff; 131 macaddr[3] = reg & 0xff; 132 133 reg = readl(io + MV643XX_ETH_MAC_ADDR_LOW); 134 macaddr[4] = (reg >> 8) & 0xff; 135 macaddr[5] = reg & 0xff; 136 137 of_update_property(np, pmac); 138 139 eth_fixup_no_mem: 140 iounmap(io); 141 clk_disable_unprepare(clk); 142 eth_fixup_no_map: 143 clk_put(clk); 144 eth_fixup_skip: 145 of_node_put(pnp); 146 } 147 } 148 149 /* 150 * Disable propagation of mbus errors to the CPU local bus, as this 151 * causes mbus errors (which can occur for example for PCI aborts) to 152 * throw CPU aborts, which we're not set up to deal with. 153 */ 154 void kirkwood_disable_mbus_error_propagation(void) 155 { 156 void __iomem *cpu_config; 157 158 cpu_config = ioremap(CPU_CONFIG_PHYS, 4); 159 writel(readl(cpu_config) & ~CPU_CONFIG_ERROR_PROP, cpu_config); 160 } 161 162 static struct of_dev_auxdata auxdata[] __initdata = { 163 OF_DEV_AUXDATA("marvell,kirkwood-audio", 0xf10a0000, 164 "mvebu-audio", NULL), 165 { /* sentinel */ } 166 }; 167 168 static void __init kirkwood_dt_init(void) 169 { 170 kirkwood_disable_mbus_error_propagation(); 171 172 BUG_ON(mvebu_mbus_dt_init(false)); 173 174 #ifdef CONFIG_CACHE_FEROCEON_L2 175 feroceon_of_init(); 176 #endif 177 kirkwood_cpufreq_init(); 178 kirkwood_cpuidle_init(); 179 180 kirkwood_pm_init(); 181 kirkwood_dt_eth_fixup(); 182 183 if (of_machine_is_compatible("lacie,netxbig")) 184 netxbig_init(); 185 186 of_platform_populate(NULL, of_default_bus_match_table, auxdata, NULL); 187 } 188 189 static const char * const kirkwood_dt_board_compat[] __initconst = { 190 "marvell,kirkwood", 191 NULL 192 }; 193 194 DT_MACHINE_START(KIRKWOOD_DT, "Marvell Kirkwood (Flattened Device Tree)") 195 /* Maintainer: Jason Cooper <jason@lakedaemon.net> */ 196 .init_machine = kirkwood_dt_init, 197 .restart = mvebu_restart, 198 .dt_compat = kirkwood_dt_board_compat, 199 MACHINE_END 200