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/of.h>
  17 #include <linux/of_address.h>
  18 #include <linux/of_net.h>
  19 #include <linux/of_platform.h>
  20 #include <linux/dma-mapping.h>
  21 #include <linux/irqchip.h>
  22 #include <asm/hardware/cache-feroceon-l2.h>
  23 #include <asm/mach/arch.h>
  24 #include <asm/mach/map.h>
  25 #include <mach/bridge-regs.h>
  26 #include <plat/common.h>
  27 #include <plat/pcie.h>
  28 #include "pm.h"
  29
  30 static struct map_desc kirkwood_io_desc[] __initdata = {
  31         {
  32                 .virtual        = (unsigned long) KIRKWOOD_REGS_VIRT_BASE,
  33                 .pfn            = __phys_to_pfn(KIRKWOOD_REGS_PHYS_BASE),
  34                 .length         = KIRKWOOD_REGS_SIZE,
  35                 .type           = MT_DEVICE,
  36         },
  37 };
  38
  39 static void __init kirkwood_map_io(void)
  40 {
  41         iotable_init(kirkwood_io_desc, ARRAY_SIZE(kirkwood_io_desc));
  42 }
  43
  44 static struct resource kirkwood_cpufreq_resources[] = {
  45         [0] = {
  46                 .start  = CPU_CONTROL_PHYS,
  47                 .end    = CPU_CONTROL_PHYS + 3,
  48                 .flags  = IORESOURCE_MEM,
  49         },
  50 };
  51
  52 static struct platform_device kirkwood_cpufreq_device = {
  53         .name           = "kirkwood-cpufreq",
  54         .id             = -1,
  55         .num_resources  = ARRAY_SIZE(kirkwood_cpufreq_resources),
  56         .resource       = kirkwood_cpufreq_resources,
  57 };
  58
  59 static void __init kirkwood_cpufreq_init(void)
  60 {
  61         platform_device_register(&kirkwood_cpufreq_device);
  62 }
  63
  64 static struct resource kirkwood_cpuidle_resource[] = {
  65         {
  66                 .flags  = IORESOURCE_MEM,
  67                 .start  = DDR_OPERATION_BASE,
  68                 .end    = DDR_OPERATION_BASE + 3,
  69         },
  70 };
  71
  72 static struct platform_device kirkwood_cpuidle = {
  73         .name           = "kirkwood_cpuidle",
  74         .id             = -1,
  75         .resource       = kirkwood_cpuidle_resource,
  76         .num_resources  = 1,
  77 };
  78
  79 static void __init kirkwood_cpuidle_init(void)
  80 {
  81         platform_device_register(&kirkwood_cpuidle);
  82 }
  83
  84 /* Temporary here since mach-mvebu has a function we can use */
  85 static void kirkwood_restart(enum reboot_mode mode, const char *cmd)
  86 {
  87         /*
  88          * Enable soft reset to assert RSTOUTn.
  89          */
  90         writel(SOFT_RESET_OUT_EN, RSTOUTn_MASK);
  91
  92         /*
  93          * Assert soft reset.
  94          */
  95         writel(SOFT_RESET, SYSTEM_SOFT_RESET);
  96
  97         while (1)
  98                 ;
  99 }
 100
 101 #define MV643XX_ETH_MAC_ADDR_LOW        0x0414
 102 #define MV643XX_ETH_MAC_ADDR_HIGH       0x0418
 103
 104 static void __init kirkwood_dt_eth_fixup(void)
 105 {
 106         struct device_node *np;
 107
 108         /*
 109          * The ethernet interfaces forget the MAC address assigned by u-boot
 110          * if the clocks are turned off. Usually, u-boot on kirkwood boards
 111          * has no DT support to properly set local-mac-address property.
 112          * As a workaround, we get the MAC address from mv643xx_eth registers
 113          * and update the port device node if no valid MAC address is set.
 114          */
 115         for_each_compatible_node(np, NULL, "marvell,kirkwood-eth-port") {
 116                 struct device_node *pnp = of_get_parent(np);
 117                 struct clk *clk;
 118                 struct property *pmac;
 119                 void __iomem *io;
 120                 u8 *macaddr;
 121                 u32 reg;
 122
 123                 if (!pnp)
 124                         continue;
 125
 126                 /* skip disabled nodes or nodes with valid MAC address*/
 127                 if (!of_device_is_available(pnp) || of_get_mac_address(np))
 128                         goto eth_fixup_skip;
 129
 130                 clk = of_clk_get(pnp, 0);
 131                 if (IS_ERR(clk))
 132                         goto eth_fixup_skip;
 133
 134                 io = of_iomap(pnp, 0);
 135                 if (!io)
 136                         goto eth_fixup_no_map;
 137
 138                 /* ensure port clock is not gated to not hang CPU */
 139                 clk_prepare_enable(clk);
 140
 141                 /* store MAC address register contents in local-mac-address */
 142                 pr_err(FW_INFO "%s: local-mac-address is not set\n",
 143                        np->full_name);
 144
 145                 pmac = kzalloc(sizeof(*pmac) + 6, GFP_KERNEL);
 146                 if (!pmac)
 147                         goto eth_fixup_no_mem;
 148
 149                 pmac->value = pmac + 1;
 150                 pmac->length = 6;
 151                 pmac->name = kstrdup("local-mac-address", GFP_KERNEL);
 152                 if (!pmac->name) {
 153                         kfree(pmac);
 154                         goto eth_fixup_no_mem;
 155                 }
 156
 157                 macaddr = pmac->value;
 158                 reg = readl(io + MV643XX_ETH_MAC_ADDR_HIGH);
 159                 macaddr[0] = (reg >> 24) & 0xff;
 160                 macaddr[1] = (reg >> 16) & 0xff;
 161                 macaddr[2] = (reg >> 8) & 0xff;
 162                 macaddr[3] = reg & 0xff;
 163
 164                 reg = readl(io + MV643XX_ETH_MAC_ADDR_LOW);
 165                 macaddr[4] = (reg >> 8) & 0xff;
 166                 macaddr[5] = reg & 0xff;
 167
 168                 of_update_property(np, pmac);
 169
 170 eth_fixup_no_mem:
 171                 iounmap(io);
 172                 clk_disable_unprepare(clk);
 173 eth_fixup_no_map:
 174                 clk_put(clk);
 175 eth_fixup_skip:
 176                 of_node_put(pnp);
 177         }
 178 }
 179
 180 /*
 181  * Disable propagation of mbus errors to the CPU local bus, as this
 182  * causes mbus errors (which can occur for example for PCI aborts) to
 183  * throw CPU aborts, which we're not set up to deal with.
 184  */
 185 static void __init kirkwood_disable_mbus_error_propagation(void)
 186 {
 187         void __iomem *cpu_config;
 188
 189         cpu_config = ioremap(CPU_CONFIG_PHYS, 4);
 190         writel(readl(cpu_config) & ~CPU_CONFIG_ERROR_PROP, cpu_config);
 191         iounmap(cpu_config);
 192 }
 193
 194 static void __init kirkwood_dt_init(void)
 195 {
 196         kirkwood_disable_mbus_error_propagation();
 197
 198         BUG_ON(mvebu_mbus_dt_init(false));
 199
 200 #ifdef CONFIG_CACHE_FEROCEON_L2
 201         feroceon_of_init();
 202 #endif
 203         kirkwood_cpufreq_init();
 204         kirkwood_cpuidle_init();
 205
 206         kirkwood_pm_init();
 207         kirkwood_dt_eth_fixup();
 208
 209         of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
 210 }
 211
 212 static const char * const kirkwood_dt_board_compat[] = {
 213         "marvell,kirkwood",
 214         NULL
 215 };
 216
 217 DT_MACHINE_START(KIRKWOOD_DT, "Marvell Kirkwood (Flattened Device Tree)")
 218         /* Maintainer: Jason Cooper <jason@lakedaemon.net> */
 219         .map_io         = kirkwood_map_io,
 220         .init_machine   = kirkwood_dt_init,
 221         .restart        = kirkwood_restart,
 222         .dt_compat      = kirkwood_dt_board_compat,
 223 MACHINE_END