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/hardware/cache-l2x0.h>
  25 #include <asm/hardware/gic.h>
  26 #include <asm/mach/arch.h>
  27 #include <asm/mach/time.h>
  28 #include <mach/common.h>
  29 #include <mach/hardware.h>
  30
  31 void imx6q_restart(char mode, const char *cmd)
  32 {
  33         struct device_node *np;
  34         void __iomem *wdog_base;
  35
  36         np = of_find_compatible_node(NULL, NULL, "fsl,imx6q-wdt");
  37         wdog_base = of_iomap(np, 0);
  38         if (!wdog_base)
  39                 goto soft;
  40
  41         imx_src_prepare_restart();
  42
  43         /* enable wdog */
  44         writew_relaxed(1 << 2, wdog_base);
  45         /* write twice to ensure the request will not get ignored */
  46         writew_relaxed(1 << 2, wdog_base);
  47
  48         /* wait for reset to assert ... */
  49         mdelay(500);
  50
  51         pr_err("Watchdog reset failed to assert reset\n");
  52
  53         /* delay to allow the serial port to show the message */
  54         mdelay(50);
  55
  56 soft:
  57         /* we'll take a jump through zero as a poor second */
  58         soft_restart(0);
  59 }
  60
  61 /* For imx6q sabrelite board: set KSZ9021RN RGMII pad skew */
  62 static int ksz9021rn_phy_fixup(struct phy_device *phydev)
  63 {
  64         /* min rx data delay */
  65         phy_write(phydev, 0x0b, 0x8105);
  66         phy_write(phydev, 0x0c, 0x0000);
  67
  68         /* max rx/tx clock delay, min rx/tx control delay */
  69         phy_write(phydev, 0x0b, 0x8104);
  70         phy_write(phydev, 0x0c, 0xf0f0);
  71         phy_write(phydev, 0x0b, 0x104);
  72
  73         return 0;
  74 }
  75
  76 static void __init imx6q_init_machine(void)
  77 {
  78         if (of_machine_is_compatible("fsl,imx6q-sabrelite"))
  79                 phy_register_fixup_for_uid(PHY_ID_KSZ9021, MICREL_PHY_ID_MASK,
  80                                            ksz9021rn_phy_fixup);
  81
  82         of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
  83
  84         imx6q_pm_init();
  85 }
  86
  87 static void __init imx6q_map_io(void)
  88 {
  89         imx_lluart_map_io();
  90         imx_scu_map_io();
  91         imx6q_clock_map_io();
  92 }
  93
  94 static int __init imx6q_gpio_add_irq_domain(struct device_node *np,
  95                                 struct device_node *interrupt_parent)
  96 {
  97         static int gpio_irq_base = MXC_GPIO_IRQ_START + ARCH_NR_GPIOS;
  98
  99         gpio_irq_base -= 32;
 100         irq_domain_add_legacy(np, 32, gpio_irq_base, 0, &irq_domain_simple_ops,
 101                               NULL);
 102
 103         return 0;
 104 }
 105
 106 static const struct of_device_id imx6q_irq_match[] __initconst = {
 107         { .compatible = "arm,cortex-a9-gic", .data = gic_of_init, },
 108         { .compatible = "fsl,imx6q-gpio", .data = imx6q_gpio_add_irq_domain, },
 109         { /* sentinel */ }
 110 };
 111
 112 static void __init imx6q_init_irq(void)
 113 {
 114         l2x0_of_init(0, ~0UL);
 115         imx_src_init();
 116         imx_gpc_init();
 117         of_irq_init(imx6q_irq_match);
 118 }
 119
 120 static void __init imx6q_timer_init(void)
 121 {
 122         mx6q_clocks_init();
 123 }
 124
 125 static struct sys_timer imx6q_timer = {
 126         .init = imx6q_timer_init,
 127 };
 128
 129 static const char *imx6q_dt_compat[] __initdata = {
 130         "fsl,imx6q-arm2",
 131         "fsl,imx6q-sabrelite",
 132         NULL,
 133 };
 134
 135 DT_MACHINE_START(IMX6Q, "Freescale i.MX6 Quad (Device Tree)")
 136         .map_io         = imx6q_map_io,
 137         .init_irq       = imx6q_init_irq,
 138         .handle_irq     = imx6q_handle_irq,
 139         .timer          = &imx6q_timer,
 140         .init_machine   = imx6q_init_machine,
 141         .dt_compat      = imx6q_dt_compat,
 142         .restart        = imx6q_restart,
 143 MACHINE_END