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