arch/arm/mach-mvebu/kirkwood.c

   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         of_platform_populate(NULL, of_default_bus_match_table, auxdata, NULL);
 184 }
 185
 186 static const char * const kirkwood_dt_board_compat[] = {
 187         "marvell,kirkwood",
 188         NULL
 189 };
 190
 191 DT_MACHINE_START(KIRKWOOD_DT, "Marvell Kirkwood (Flattened Device Tree)")
 192         /* Maintainer: Jason Cooper <jason@lakedaemon.net> */
 193         .init_machine   = kirkwood_dt_init,
 194         .restart        = mvebu_restart,
 195         .dt_compat      = kirkwood_dt_board_compat,
 196 MACHINE_END