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 <mach/common.h>
  30 #include <mach/hardware.h>
  31
  32 void imx6q_restart(char mode, const char *cmd)
  33 {
  34         struct device_node *np;
  35         void __iomem *wdog_base;
  36
  37         np = of_find_compatible_node(NULL, NULL, "fsl,imx6q-wdt");
  38         wdog_base = of_iomap(np, 0);
  39         if (!wdog_base)
  40                 goto soft;
  41
  42         imx_src_prepare_restart();
  43
  44         /* enable wdog */
  45         writew_relaxed(1 << 2, wdog_base);
  46         /* write twice to ensure the request will not get ignored */
  47         writew_relaxed(1 << 2, wdog_base);
  48
  49         /* wait for reset to assert ... */
  50         mdelay(500);
  51
  52         pr_err("Watchdog reset failed to assert reset\n");
  53
  54         /* delay to allow the serial port to show the message */
  55         mdelay(50);
  56
  57 soft:
  58         /* we'll take a jump through zero as a poor second */
  59         soft_restart(0);
  60 }
  61
  62 /* For imx6q sabrelite board: set KSZ9021RN RGMII pad skew */
  63 static int ksz9021rn_phy_fixup(struct phy_device *phydev)
  64 {
  65         /* min rx data delay */
  66         phy_write(phydev, 0x0b, 0x8105);
  67         phy_write(phydev, 0x0c, 0x0000);
  68
  69         /* max rx/tx clock delay, min rx/tx control delay */
  70         phy_write(phydev, 0x0b, 0x8104);
  71         phy_write(phydev, 0x0c, 0xf0f0);
  72         phy_write(phydev, 0x0b, 0x104);
  73
  74         return 0;
  75 }
  76
  77 static void __init imx6q_init_machine(void)
  78 {
  79         if (of_machine_is_compatible("fsl,imx6q-sabrelite"))
  80                 phy_register_fixup_for_uid(PHY_ID_KSZ9021, MICREL_PHY_ID_MASK,
  81                                            ksz9021rn_phy_fixup);
  82
  83         of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
  84
  85         imx6q_pm_init();
  86 }
  87
  88 static void __init imx6q_map_io(void)
  89 {
  90         imx_lluart_map_io();
  91         imx_scu_map_io();
  92         imx6q_clock_map_io();
  93 }
  94
  95 static int __init imx6q_gpio_add_irq_domain(struct device_node *np,
  96                                 struct device_node *interrupt_parent)
  97 {
  98         static int gpio_irq_base = MXC_GPIO_IRQ_START + ARCH_NR_GPIOS;
  99
 100         gpio_irq_base -= 32;
 101         irq_domain_add_legacy(np, 32, gpio_irq_base, 0, &irq_domain_simple_ops,
 102                               NULL);
 103
 104         return 0;
 105 }
 106
 107 static const struct of_device_id imx6q_irq_match[] __initconst = {
 108         { .compatible = "arm,cortex-a9-gic", .data = gic_of_init, },
 109         { .compatible = "fsl,imx6q-gpio", .data = imx6q_gpio_add_irq_domain, },
 110         { /* sentinel */ }
 111 };
 112
 113 static void __init imx6q_init_irq(void)
 114 {
 115         l2x0_of_init(0, ~0UL);
 116         imx_src_init();
 117         imx_gpc_init();
 118         of_irq_init(imx6q_irq_match);
 119 }
 120
 121 static void __init imx6q_timer_init(void)
 122 {
 123         mx6q_clocks_init();
 124         twd_local_timer_of_register();
 125 }
 126
 127 static struct sys_timer imx6q_timer = {
 128         .init = imx6q_timer_init,
 129 };
 130
 131 static const char *imx6q_dt_compat[] __initdata = {
 132         "fsl,imx6q-arm2",
 133         "fsl,imx6q-sabrelite",
 134         NULL,
 135 };
 136
 137 DT_MACHINE_START(IMX6Q, "Freescale i.MX6 Quad (Device Tree)")
 138         .map_io         = imx6q_map_io,
 139         .init_irq       = imx6q_init_irq,
 140         .handle_irq     = imx6q_handle_irq,
 141         .timer          = &imx6q_timer,
 142         .init_machine   = imx6q_init_machine,
 143         .dt_compat      = imx6q_dt_compat,
 144         .restart        = imx6q_restart,
 145 MACHINE_END