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