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