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/kernel.h>
  14 #include <linux/init.h>
  15 #include <linux/of.h>
  16 #include <linux/of_platform.h>
  17 #include <linux/clk-provider.h>
  18 #include <linux/clocksource.h>
  19 #include <linux/dma-mapping.h>
  20 #include <linux/irqchip.h>
  21 #include <linux/kexec.h>
  22 #include <asm/mach/arch.h>
  23 #include <asm/mach/map.h>
  24 #include <mach/bridge-regs.h>
  25 #include <linux/platform_data/usb-ehci-orion.h>
  26 #include <plat/irq.h>
  27 #include <plat/common.h>
  28 #include "common.h"
  29
  30 /*
  31  * There are still devices that doesn't know about DT yet.  Get clock
  32  * gates here and add a clock lookup alias, so that old platform
  33  * devices still work.
  34 */
  35
  36 static void __init kirkwood_legacy_clk_init(void)
  37 {
  38
  39         struct device_node *np = of_find_compatible_node(
  40                 NULL, NULL, "marvell,kirkwood-gating-clock");
  41         struct of_phandle_args clkspec;
  42         struct clk *clk;
  43
  44         clkspec.np = np;
  45         clkspec.args_count = 1;
  46
  47         clkspec.args[0] = CGC_BIT_PEX0;
  48         orion_clkdev_add("0", "pcie",
  49                          of_clk_get_from_provider(&clkspec));
  50
  51         clkspec.args[0] = CGC_BIT_PEX1;
  52         orion_clkdev_add("1", "pcie",
  53                          of_clk_get_from_provider(&clkspec));
  54
  55         /*
  56          * The ethernet interfaces forget the MAC address assigned by
  57          * u-boot if the clocks are turned off. Until proper DT support
  58          * is available we always enable them for now.
  59          */
  60         clkspec.args[0] = CGC_BIT_GE0;
  61         clk = of_clk_get_from_provider(&clkspec);
  62         clk_prepare_enable(clk);
  63
  64         clkspec.args[0] = CGC_BIT_GE1;
  65         clk = of_clk_get_from_provider(&clkspec);
  66         clk_prepare_enable(clk);
  67 }
  68
  69 static void __init kirkwood_dt_time_init(void)
  70 {
  71         of_clk_init(NULL);
  72         clocksource_of_init();
  73 }
  74
  75 static void __init kirkwood_dt_init_early(void)
  76 {
  77         mvebu_mbus_init("marvell,kirkwood-mbus",
  78                         BRIDGE_WINS_BASE, BRIDGE_WINS_SZ,
  79                         DDR_WINDOW_CPU_BASE, DDR_WINDOW_CPU_SZ);
  80 }
  81
  82 static void __init kirkwood_dt_init(void)
  83 {
  84         pr_info("Kirkwood: %s, TCLK=%d.\n", kirkwood_id(), kirkwood_tclk);
  85
  86         /*
  87          * Disable propagation of mbus errors to the CPU local bus,
  88          * as this causes mbus errors (which can occur for example
  89          * for PCI aborts) to throw CPU aborts, which we're not set
  90          * up to deal with.
  91          */
  92         writel(readl(CPU_CONFIG) & ~CPU_CONFIG_ERROR_PROP, CPU_CONFIG);
  93
  94         BUG_ON(mvebu_mbus_dt_init());
  95         kirkwood_setup_wins();
  96
  97         kirkwood_l2_init();
  98
  99         kirkwood_cpufreq_init();
 100
 101         /* Setup clocks for legacy devices */
 102         kirkwood_legacy_clk_init();
 103
 104         kirkwood_cpuidle_init();
 105
 106 #ifdef CONFIG_KEXEC
 107         kexec_reinit = kirkwood_enable_pcie;
 108 #endif
 109
 110         if (of_machine_is_compatible("marvell,mv88f6281gtw-ge"))
 111                 mv88f6281gtw_ge_init();
 112
 113         of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
 114 }
 115
 116 static const char * const kirkwood_dt_board_compat[] = {
 117         "marvell,kirkwood",
 118         NULL
 119 };
 120
 121 DT_MACHINE_START(KIRKWOOD_DT, "Marvell Kirkwood (Flattened Device Tree)")
 122         /* Maintainer: Jason Cooper <jason@lakedaemon.net> */
 123         .map_io         = kirkwood_map_io,
 124         .init_early     = kirkwood_dt_init_early,
 125         .init_time      = kirkwood_dt_time_init,
 126         .init_machine   = kirkwood_dt_init,
 127         .restart        = kirkwood_restart,
 128         .dt_compat      = kirkwood_dt_board_compat,
 129 MACHINE_END