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