arch/arm/mach-mvebu/kirkwood.c

   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