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_address.h>
  17 #include <linux/of_net.h>
  18 #include <linux/of_platform.h>
  19 #include <linux/clk-provider.h>
  20 #include <linux/clocksource.h>
  21 #include <linux/dma-mapping.h>
  22 #include <linux/irqchip.h>
  23 #include <linux/kexec.h>
  24 #include <asm/mach/arch.h>
  25 #include <asm/mach/map.h>
  26 #include <mach/bridge-regs.h>
  27 #include <linux/platform_data/usb-ehci-orion.h>
  28 #include <plat/irq.h>
  29 #include <plat/common.h>
  30 #include "common.h"
  31
  32 /*
  33  * There are still devices that doesn't know about DT yet.  Get clock
  34  * gates here and add a clock lookup alias, so that old platform
  35  * devices still work.
  36 */
  37
  38 static void __init kirkwood_legacy_clk_init(void)
  39 {
  40
  41         struct device_node *np = of_find_compatible_node(
  42                 NULL, NULL, "marvell,kirkwood-gating-clock");
  43         struct of_phandle_args clkspec;
  44         struct clk *clk;
  45
  46         clkspec.np = np;
  47         clkspec.args_count = 1;
  48
  49         /*
  50          * The ethernet interfaces forget the MAC address assigned by
  51          * u-boot if the clocks are turned off. Until proper DT support
  52          * is available we always enable them for now.
  53          */
  54         clkspec.args[0] = CGC_BIT_GE0;
  55         clk = of_clk_get_from_provider(&clkspec);
  56         clk_prepare_enable(clk);
  57
  58         clkspec.args[0] = CGC_BIT_GE1;
  59         clk = of_clk_get_from_provider(&clkspec);
  60         clk_prepare_enable(clk);
  61 }
  62
  63 #define MV643XX_ETH_MAC_ADDR_LOW        0x0414
  64 #define MV643XX_ETH_MAC_ADDR_HIGH       0x0418
  65
  66 static void __init kirkwood_dt_eth_fixup(void)
  67 {
  68         struct device_node *np;
  69
  70         /*
  71          * The ethernet interfaces forget the MAC address assigned by u-boot
  72          * if the clocks are turned off. Usually, u-boot on kirkwood boards
  73          * has no DT support to properly set local-mac-address property.
  74          * As a workaround, we get the MAC address from mv643xx_eth registers
  75          * and update the port device node if no valid MAC address is set.
  76          */
  77         for_each_compatible_node(np, NULL, "marvell,kirkwood-eth-port") {
  78                 struct device_node *pnp = of_get_parent(np);
  79                 struct clk *clk;
  80                 struct property *pmac;
  81                 void __iomem *io;
  82                 u8 *macaddr;
  83                 u32 reg;
  84
  85                 if (!pnp)
  86                         continue;
  87
  88                 /* skip disabled nodes or nodes with valid MAC address*/
  89                 if (!of_device_is_available(pnp) || of_get_mac_address(np))
  90                         goto eth_fixup_skip;
  91
  92                 clk = of_clk_get(pnp, 0);
  93                 if (IS_ERR(clk))
  94                         goto eth_fixup_skip;
  95
  96                 io = of_iomap(pnp, 0);
  97                 if (!io)
  98                         goto eth_fixup_no_map;
  99
 100                 /* ensure port clock is not gated to not hang CPU */
 101                 clk_prepare_enable(clk);
 102
 103                 /* store MAC address register contents in local-mac-address */
 104                 pr_err(FW_INFO "%s: local-mac-address is not set\n",
 105                        np->full_name);
 106
 107                 pmac = kzalloc(sizeof(*pmac) + 6, GFP_KERNEL);
 108                 if (!pmac)
 109                         goto eth_fixup_no_mem;
 110
 111                 pmac->value = pmac + 1;
 112                 pmac->length = 6;
 113                 pmac->name = kstrdup("local-mac-address", GFP_KERNEL);
 114                 if (!pmac->name) {
 115                         kfree(pmac);
 116                         goto eth_fixup_no_mem;
 117                 }
 118
 119                 macaddr = pmac->value;
 120                 reg = readl(io + MV643XX_ETH_MAC_ADDR_HIGH);
 121                 macaddr[0] = (reg >> 24) & 0xff;
 122                 macaddr[1] = (reg >> 16) & 0xff;
 123                 macaddr[2] = (reg >> 8) & 0xff;
 124                 macaddr[3] = reg & 0xff;
 125
 126                 reg = readl(io + MV643XX_ETH_MAC_ADDR_LOW);
 127                 macaddr[4] = (reg >> 8) & 0xff;
 128                 macaddr[5] = reg & 0xff;
 129
 130                 of_update_property(np, pmac);
 131
 132 eth_fixup_no_mem:
 133                 iounmap(io);
 134                 clk_disable_unprepare(clk);
 135 eth_fixup_no_map:
 136                 clk_put(clk);
 137 eth_fixup_skip:
 138                 of_node_put(pnp);
 139         }
 140 }
 141
 142 static void __init kirkwood_dt_time_init(void)
 143 {
 144         of_clk_init(NULL);
 145         clocksource_of_init();
 146 }
 147
 148 static void __init kirkwood_dt_init(void)
 149 {
 150         pr_info("Kirkwood: %s, TCLK=%d.\n", kirkwood_id(), kirkwood_tclk);
 151
 152         /*
 153          * Disable propagation of mbus errors to the CPU local bus,
 154          * as this causes mbus errors (which can occur for example
 155          * for PCI aborts) to throw CPU aborts, which we're not set
 156          * up to deal with.
 157          */
 158         writel(readl(CPU_CONFIG) & ~CPU_CONFIG_ERROR_PROP, CPU_CONFIG);
 159
 160         BUG_ON(mvebu_mbus_dt_init());
 161         kirkwood_setup_wins();
 162
 163         kirkwood_l2_init();
 164
 165         kirkwood_cpufreq_init();
 166         kirkwood_cpuidle_init();
 167         /* Setup clocks for legacy devices */
 168         kirkwood_legacy_clk_init();
 169
 170         kirkwood_pm_init();
 171         kirkwood_dt_eth_fixup();
 172
 173 #ifdef CONFIG_KEXEC
 174         kexec_reinit = kirkwood_enable_pcie;
 175 #endif
 176
 177         if (of_machine_is_compatible("marvell,mv88f6281gtw-ge"))
 178                 mv88f6281gtw_ge_init();
 179
 180         of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
 181 }
 182
 183 static const char * const kirkwood_dt_board_compat[] = {
 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         .map_io         = kirkwood_map_io,
 191         .init_time      = kirkwood_dt_time_init,
 192         .init_machine   = kirkwood_dt_init,
 193         .restart        = kirkwood_restart,
 194         .dt_compat      = kirkwood_dt_board_compat,
 195 MACHINE_END