arch/arm/mach-kirkwood/board-dt.c

   1 /*
   2  * Copyright 2012 (C), Jason Cooper <jason@lakedaemon.net>
   3  *
   4  * arch/arm/mach-kirkwood/board-dt.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/io.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/clk-provider.h>
  22 #include <linux/clocksource.h>
  23 #include <linux/slab.h>
  24 #include <asm/mach/arch.h>
  25 #include <mach/bridge-regs.h>
  26 #include <plat/common.h>
  27 #include "common.h"
  28
  29 #define MV643XX_ETH_MAC_ADDR_LOW        0x0414
  30 #define MV643XX_ETH_MAC_ADDR_HIGH       0x0418
  31
  32 static void __init kirkwood_dt_eth_fixup(void)
  33 {
  34         struct device_node *np;
  35
  36         /*
  37          * The ethernet interfaces forget the MAC address assigned by u-boot
  38          * if the clocks are turned off. Usually, u-boot on kirkwood boards
  39          * has no DT support to properly set local-mac-address property.
  40          * As a workaround, we get the MAC address from mv643xx_eth registers
  41          * and update the port device node if no valid MAC address is set.
  42          */
  43         for_each_compatible_node(np, NULL, "marvell,kirkwood-eth-port") {
  44                 struct device_node *pnp = of_get_parent(np);
  45                 struct clk *clk;
  46                 struct property *pmac;
  47                 void __iomem *io;
  48                 u8 *macaddr;
  49                 u32 reg;
  50
  51                 if (!pnp)
  52                         continue;
  53
  54                 /* skip disabled nodes or nodes with valid MAC address*/
  55                 if (!of_device_is_available(pnp) || of_get_mac_address(np))
  56                         goto eth_fixup_skip;
  57
  58                 clk = of_clk_get(pnp, 0);
  59                 if (IS_ERR(clk))
  60                         goto eth_fixup_skip;
  61
  62                 io = of_iomap(pnp, 0);
  63                 if (!io)
  64                         goto eth_fixup_no_map;
  65
  66                 /* ensure port clock is not gated to not hang CPU */
  67                 clk_prepare_enable(clk);
  68
  69                 /* store MAC address register contents in local-mac-address */
  70                 pr_err(FW_INFO "%s: local-mac-address is not set\n",
  71                        np->full_name);
  72
  73                 pmac = kzalloc(sizeof(*pmac) + 6, GFP_KERNEL);
  74                 if (!pmac)
  75                         goto eth_fixup_no_mem;
  76
  77                 pmac->value = pmac + 1;
  78                 pmac->length = 6;
  79                 pmac->name = kstrdup("local-mac-address", GFP_KERNEL);
  80                 if (!pmac->name) {
  81                         kfree(pmac);
  82                         goto eth_fixup_no_mem;
  83                 }
  84
  85                 macaddr = pmac->value;
  86                 reg = readl(io + MV643XX_ETH_MAC_ADDR_HIGH);
  87                 macaddr[0] = (reg >> 24) & 0xff;
  88                 macaddr[1] = (reg >> 16) & 0xff;
  89                 macaddr[2] = (reg >> 8) & 0xff;
  90                 macaddr[3] = reg & 0xff;
  91
  92                 reg = readl(io + MV643XX_ETH_MAC_ADDR_LOW);
  93                 macaddr[4] = (reg >> 8) & 0xff;
  94                 macaddr[5] = reg & 0xff;
  95
  96                 of_update_property(np, pmac);
  97
  98 eth_fixup_no_mem:
  99                 iounmap(io);
 100                 clk_disable_unprepare(clk);
 101 eth_fixup_no_map:
 102                 clk_put(clk);
 103 eth_fixup_skip:
 104                 of_node_put(pnp);
 105         }
 106 }
 107
 108 static void __init kirkwood_dt_time_init(void)
 109 {
 110         of_clk_init(NULL);
 111         clocksource_of_init();
 112 }
 113
 114 static void __init kirkwood_dt_init(void)
 115 {
 116         pr_info("Kirkwood: %s, TCLK=%d.\n", kirkwood_id(), kirkwood_tclk);
 117
 118         /*
 119          * Disable propagation of mbus errors to the CPU local bus,
 120          * as this causes mbus errors (which can occur for example
 121          * for PCI aborts) to throw CPU aborts, which we're not set
 122          * up to deal with.
 123          */
 124         writel(readl(CPU_CONFIG) & ~CPU_CONFIG_ERROR_PROP, CPU_CONFIG);
 125
 126         BUG_ON(mvebu_mbus_dt_init());
 127
 128         kirkwood_l2_init();
 129
 130         kirkwood_cpufreq_init();
 131         kirkwood_cpuidle_init();
 132
 133         kirkwood_pm_init();
 134         kirkwood_dt_eth_fixup();
 135
 136 #ifdef CONFIG_KEXEC
 137         kexec_reinit = kirkwood_enable_pcie;
 138 #endif
 139
 140         if (of_machine_is_compatible("marvell,mv88f6281gtw-ge"))
 141                 mv88f6281gtw_ge_init();
 142
 143         of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
 144 }
 145
 146 static const char * const kirkwood_dt_board_compat[] = {
 147         "marvell,kirkwood",
 148         NULL
 149 };
 150
 151 DT_MACHINE_START(KIRKWOOD_DT, "Marvell Kirkwood (Flattened Device Tree)")
 152         /* Maintainer: Jason Cooper <jason@lakedaemon.net> */
 153         .map_io         = kirkwood_map_io,
 154         .init_time      = kirkwood_dt_time_init,
 155         .init_machine   = kirkwood_dt_init,
 156         .restart        = kirkwood_restart,
 157         .dt_compat      = kirkwood_dt_board_compat,
 158 MACHINE_END