arch/arm/mach-imx/mach-imx6q.c

   1 /*
   2  * Copyright 2011 Freescale Semiconductor, Inc.
   3  * Copyright 2011 Linaro Ltd.
   4  *
   5  * The code contained herein is licensed under the GNU General Public
   6  * License. You may obtain a copy of the GNU General Public License
   7  * Version 2 or later at the following locations:
   8  *
   9  * http://www.opensource.org/licenses/gpl-license.html
  10  * http://www.gnu.org/copyleft/gpl.html
  11  */
  12
  13 #include <linux/delay.h>
  14 #include <linux/init.h>
  15 #include <linux/io.h>
  16 #include <linux/irq.h>
  17 #include <linux/irqdomain.h>
  18 #include <linux/of.h>
  19 #include <linux/of_address.h>
  20 #include <linux/of_irq.h>
  21 #include <linux/of_platform.h>
  22 #include <linux/phy.h>
  23 #include <linux/micrel_phy.h>
  24 #include <asm/smp_twd.h>
  25 #include <asm/hardware/cache-l2x0.h>
  26 #include <asm/hardware/gic.h>
  27 #include <asm/mach/arch.h>
  28 #include <asm/mach/time.h>
  29 #include <asm/system_misc.h>
  30 #include <mach/common.h>
  31 #include <mach/hardware.h>
  32
  33 void imx6q_restart(char mode, const char *cmd)
  34 {
  35         struct device_node *np;
  36         void __iomem *wdog_base;
  37
  38         np = of_find_compatible_node(NULL, NULL, "fsl,imx6q-wdt");
  39         wdog_base = of_iomap(np, 0);
  40         if (!wdog_base)
  41                 goto soft;
  42
  43         imx_src_prepare_restart();
  44
  45         /* enable wdog */
  46         writew_relaxed(1 << 2, wdog_base);
  47         /* write twice to ensure the request will not get ignored */
  48         writew_relaxed(1 << 2, wdog_base);
  49
  50         /* wait for reset to assert ... */
  51         mdelay(500);
  52
  53         pr_err("Watchdog reset failed to assert reset\n");
  54
  55         /* delay to allow the serial port to show the message */
  56         mdelay(50);
  57
  58 soft:
  59         /* we'll take a jump through zero as a poor second */
  60         soft_restart(0);
  61 }
  62
  63 /* For imx6q sabrelite board: set KSZ9021RN RGMII pad skew */
  64 static int ksz9021rn_phy_fixup(struct phy_device *phydev)
  65 {
  66         /* min rx data delay */
  67         phy_write(phydev, 0x0b, 0x8105);
  68         phy_write(phydev, 0x0c, 0x0000);
  69
  70         /* max rx/tx clock delay, min rx/tx control delay */
  71         phy_write(phydev, 0x0b, 0x8104);
  72         phy_write(phydev, 0x0c, 0xf0f0);
  73         phy_write(phydev, 0x0b, 0x104);
  74
  75         return 0;
  76 }
  77
  78 static void __init imx6q_sabrelite_init(void)
  79 {
  80         phy_register_fixup_for_uid(PHY_ID_KSZ9021, MICREL_PHY_ID_MASK,
  81                                 ksz9021rn_phy_fixup);
  82 }
  83
  84 static void __init imx6q_init_machine(void)
  85 {
  86         if (of_machine_is_compatible("fsl,imx6q-sabrelite"))
  87                 imx6q_sabrelite_init();
  88
  89         of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
  90
  91         imx6q_pm_init();
  92 }
  93
  94 static void __init imx6q_map_io(void)
  95 {
  96         imx_lluart_map_io();
  97         imx_scu_map_io();
  98         imx6q_clock_map_io();
  99 }
 100
 101 static int __init imx6q_gpio_add_irq_domain(struct device_node *np,
 102                                 struct device_node *interrupt_parent)
 103 {
 104         static int gpio_irq_base = MXC_GPIO_IRQ_START + ARCH_NR_GPIOS;
 105
 106         gpio_irq_base -= 32;
 107         irq_domain_add_legacy(np, 32, gpio_irq_base, 0, &irq_domain_simple_ops,
 108                               NULL);
 109
 110         return 0;
 111 }
 112
 113 static const struct of_device_id imx6q_irq_match[] __initconst = {
 114         { .compatible = "arm,cortex-a9-gic", .data = gic_of_init, },
 115         { .compatible = "fsl,imx6q-gpio", .data = imx6q_gpio_add_irq_domain, },
 116         { /* sentinel */ }
 117 };
 118
 119 static void __init imx6q_init_irq(void)
 120 {
 121         l2x0_of_init(0, ~0UL);
 122         imx_src_init();
 123         imx_gpc_init();
 124         of_irq_init(imx6q_irq_match);
 125 }
 126
 127 static void __init imx6q_timer_init(void)
 128 {
 129         mx6q_clocks_init();
 130         twd_local_timer_of_register();
 131 }
 132
 133 static struct sys_timer imx6q_timer = {
 134         .init = imx6q_timer_init,
 135 };
 136
 137 static const char *imx6q_dt_compat[] __initdata = {
 138         "fsl,imx6q-arm2",
 139         "fsl,imx6q-sabrelite",
 140         "fsl,imx6q-sabresd",
 141         "fsl,imx6q",
 142         NULL,
 143 };
 144
 145 DT_MACHINE_START(IMX6Q, "Freescale i.MX6 Quad (Device Tree)")
 146         .map_io         = imx6q_map_io,
 147         .init_irq       = imx6q_init_irq,
 148         .handle_irq     = imx6q_handle_irq,
 149         .timer          = &imx6q_timer,
 150         .init_machine   = imx6q_init_machine,
 151         .dt_compat      = imx6q_dt_compat,
 152         .restart        = imx6q_restart,
 153 MACHINE_END