1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright 2012 (C), Jason Cooper <jason@lakedaemon.net> 4 * 5 * arch/arm/mach-mvebu/kirkwood.c 6 * 7 * Flattened Device Tree board initialization 8 */ 9 10 #include <linux/clk.h> 11 #include <linux/kernel.h> 12 #include <linux/init.h> 13 #include <linux/mbus.h> 14 #include <linux/of.h> 15 #include <linux/of_address.h> 16 #include <linux/of_net.h> 17 #include <linux/of_platform.h> 18 #include <linux/slab.h> 19 #include <asm/hardware/cache-feroceon-l2.h> 20 #include <asm/mach/arch.h> 21 #include <asm/mach/map.h> 22 #include "kirkwood.h" 23 #include "kirkwood-pm.h" 24 #include "common.h" 25 26 static struct resource kirkwood_cpufreq_resources[] = { 27 [0] = { 28 .start = CPU_CONTROL_PHYS, 29 .end = CPU_CONTROL_PHYS + 3, 30 .flags = IORESOURCE_MEM, 31 }, 32 }; 33 34 static struct platform_device kirkwood_cpufreq_device = { 35 .name = "kirkwood-cpufreq", 36 .id = -1, 37 .num_resources = ARRAY_SIZE(kirkwood_cpufreq_resources), 38 .resource = kirkwood_cpufreq_resources, 39 }; 40 41 static void __init kirkwood_cpufreq_init(void) 42 { 43 platform_device_register(&kirkwood_cpufreq_device); 44 } 45 46 static struct resource kirkwood_cpuidle_resource[] = { 47 { 48 .flags = IORESOURCE_MEM, 49 .start = DDR_OPERATION_BASE, 50 .end = DDR_OPERATION_BASE + 3, 51 }, 52 }; 53 54 static struct platform_device kirkwood_cpuidle = { 55 .name = "kirkwood_cpuidle", 56 .id = -1, 57 .resource = kirkwood_cpuidle_resource, 58 .num_resources = 1, 59 }; 60 61 static void __init kirkwood_cpuidle_init(void) 62 { 63 platform_device_register(&kirkwood_cpuidle); 64 } 65 66 #define MV643XX_ETH_MAC_ADDR_LOW 0x0414 67 #define MV643XX_ETH_MAC_ADDR_HIGH 0x0418 68 69 static void __init kirkwood_dt_eth_fixup(void) 70 { 71 struct device_node *np; 72 73 /* 74 * The ethernet interfaces forget the MAC address assigned by u-boot 75 * if the clocks are turned off. Usually, u-boot on kirkwood boards 76 * has no DT support to properly set local-mac-address property. 77 * As a workaround, we get the MAC address from mv643xx_eth registers 78 * and update the port device node if no valid MAC address is set. 79 */ 80 for_each_compatible_node(np, NULL, "marvell,kirkwood-eth-port") { 81 struct device_node *pnp = of_get_parent(np); 82 struct clk *clk; 83 struct property *pmac; 84 u8 tmpmac[ETH_ALEN]; 85 void __iomem *io; 86 u8 *macaddr; 87 u32 reg; 88 89 if (!pnp) 90 continue; 91 92 /* skip disabled nodes or nodes with valid MAC address*/ 93 if (!of_device_is_available(pnp) || 94 !of_get_mac_address(np, tmpmac)) 95 goto eth_fixup_skip; 96 97 clk = of_clk_get(pnp, 0); 98 if (IS_ERR(clk)) 99 goto eth_fixup_skip; 100 101 io = of_iomap(pnp, 0); 102 if (!io) 103 goto eth_fixup_no_map; 104 105 /* ensure port clock is not gated to not hang CPU */ 106 clk_prepare_enable(clk); 107 108 /* store MAC address register contents in local-mac-address */ 109 pmac = kzalloc(sizeof(*pmac) + 6, GFP_KERNEL); 110 if (!pmac) 111 goto eth_fixup_no_mem; 112 113 pmac->value = pmac + 1; 114 pmac->length = 6; 115 pmac->name = kstrdup("local-mac-address", GFP_KERNEL); 116 if (!pmac->name) { 117 kfree(pmac); 118 goto eth_fixup_no_mem; 119 } 120 121 macaddr = pmac->value; 122 reg = readl(io + MV643XX_ETH_MAC_ADDR_HIGH); 123 macaddr[0] = (reg >> 24) & 0xff; 124 macaddr[1] = (reg >> 16) & 0xff; 125 macaddr[2] = (reg >> 8) & 0xff; 126 macaddr[3] = reg & 0xff; 127 128 reg = readl(io + MV643XX_ETH_MAC_ADDR_LOW); 129 macaddr[4] = (reg >> 8) & 0xff; 130 macaddr[5] = reg & 0xff; 131 132 of_update_property(np, pmac); 133 134 eth_fixup_no_mem: 135 iounmap(io); 136 clk_disable_unprepare(clk); 137 eth_fixup_no_map: 138 clk_put(clk); 139 eth_fixup_skip: 140 of_node_put(pnp); 141 } 142 } 143 144 /* 145 * Disable propagation of mbus errors to the CPU local bus, as this 146 * causes mbus errors (which can occur for example for PCI aborts) to 147 * throw CPU aborts, which we're not set up to deal with. 148 */ 149 static void kirkwood_disable_mbus_error_propagation(void) 150 { 151 void __iomem *cpu_config; 152 153 cpu_config = ioremap(CPU_CONFIG_PHYS, 4); 154 writel(readl(cpu_config) & ~CPU_CONFIG_ERROR_PROP, cpu_config); 155 } 156 157 static struct of_dev_auxdata auxdata[] __initdata = { 158 OF_DEV_AUXDATA("marvell,kirkwood-audio", 0xf10a0000, 159 "mvebu-audio", NULL), 160 { /* sentinel */ } 161 }; 162 163 static void __init kirkwood_dt_init(void) 164 { 165 kirkwood_disable_mbus_error_propagation(); 166 167 BUG_ON(mvebu_mbus_dt_init(false)); 168 169 #ifdef CONFIG_CACHE_FEROCEON_L2 170 feroceon_of_init(); 171 #endif 172 kirkwood_cpufreq_init(); 173 kirkwood_cpuidle_init(); 174 175 kirkwood_pm_init(); 176 kirkwood_dt_eth_fixup(); 177 178 of_platform_default_populate(NULL, auxdata, NULL); 179 } 180 181 static const char * const kirkwood_dt_board_compat[] __initconst = { 182 "marvell,kirkwood", 183 NULL 184 }; 185 186 DT_MACHINE_START(KIRKWOOD_DT, "Marvell Kirkwood (Flattened Device Tree)") 187 /* Maintainer: Jason Cooper <jason@lakedaemon.net> */ 188 .init_machine = kirkwood_dt_init, 189 .restart = mvebu_restart, 190 .dt_compat = kirkwood_dt_board_compat, 191 MACHINE_END 192