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/clk.h>
  14 #include <linux/clkdev.h>
  15 #include <linux/delay.h>
  16 #include <linux/init.h>
  17 #include <linux/io.h>
  18 #include <linux/irq.h>
  19 #include <linux/of.h>
  20 #include <linux/of_address.h>
  21 #include <linux/of_irq.h>
  22 #include <linux/of_platform.h>
  23 #include <linux/pinctrl/machine.h>
  24 #include <linux/phy.h>
  25 #include <linux/micrel_phy.h>
  26 #include <linux/mfd/anatop.h>
  27 #include <asm/smp_twd.h>
  28 #include <asm/hardware/cache-l2x0.h>
  29 #include <asm/hardware/gic.h>
  30 #include <asm/mach/arch.h>
  31 #include <asm/mach/time.h>
  32 #include <asm/system_misc.h>
  33 #include <mach/common.h>
  34 #include <mach/hardware.h>
  35
  36 void imx6q_restart(char mode, const char *cmd)
  37 {
  38         struct device_node *np;
  39         void __iomem *wdog_base;
  40
  41         np = of_find_compatible_node(NULL, NULL, "fsl,imx6q-wdt");
  42         wdog_base = of_iomap(np, 0);
  43         if (!wdog_base)
  44                 goto soft;
  45
  46         imx_src_prepare_restart();
  47
  48         /* enable wdog */
  49         writew_relaxed(1 << 2, wdog_base);
  50         /* write twice to ensure the request will not get ignored */
  51         writew_relaxed(1 << 2, wdog_base);
  52
  53         /* wait for reset to assert ... */
  54         mdelay(500);
  55
  56         pr_err("Watchdog reset failed to assert reset\n");
  57
  58         /* delay to allow the serial port to show the message */
  59         mdelay(50);
  60
  61 soft:
  62         /* we'll take a jump through zero as a poor second */
  63         soft_restart(0);
  64 }
  65
  66 /* For imx6q sabrelite board: set KSZ9021RN RGMII pad skew */
  67 static int ksz9021rn_phy_fixup(struct phy_device *phydev)
  68 {
  69         if (IS_ENABLED(CONFIG_PHYLIB)) {
  70                 /* min rx data delay */
  71                 phy_write(phydev, 0x0b, 0x8105);
  72                 phy_write(phydev, 0x0c, 0x0000);
  73
  74                 /* max rx/tx clock delay, min rx/tx control delay */
  75                 phy_write(phydev, 0x0b, 0x8104);
  76                 phy_write(phydev, 0x0c, 0xf0f0);
  77                 phy_write(phydev, 0x0b, 0x104);
  78         }
  79
  80         return 0;
  81 }
  82
  83 static void __init imx6q_sabrelite_cko1_setup(void)
  84 {
  85         struct clk *cko1_sel, *ahb, *cko1;
  86         unsigned long rate;
  87
  88         cko1_sel = clk_get_sys(NULL, "cko1_sel");
  89         ahb = clk_get_sys(NULL, "ahb");
  90         cko1 = clk_get_sys(NULL, "cko1");
  91         if (IS_ERR(cko1_sel) || IS_ERR(ahb) || IS_ERR(cko1)) {
  92                 pr_err("cko1 setup failed!\n");
  93                 goto put_clk;
  94         }
  95         clk_set_parent(cko1_sel, ahb);
  96         rate = clk_round_rate(cko1, 16000000);
  97         clk_set_rate(cko1, rate);
  98         clk_register_clkdev(cko1, NULL, "0-000a");
  99 put_clk:
 100         if (!IS_ERR(cko1_sel))
 101                 clk_put(cko1_sel);
 102         if (!IS_ERR(ahb))
 103                 clk_put(ahb);
 104         if (!IS_ERR(cko1))
 105                 clk_put(cko1);
 106 }
 107
 108 static void __init imx6q_sabrelite_init(void)
 109 {
 110         if (IS_ENABLED(CONFIG_PHYLIB))
 111                 phy_register_fixup_for_uid(PHY_ID_KSZ9021, MICREL_PHY_ID_MASK,
 112                                 ksz9021rn_phy_fixup);
 113         imx6q_sabrelite_cko1_setup();
 114 }
 115
 116 static void __init imx6q_usb_init(void)
 117 {
 118         struct device_node *np;
 119         struct platform_device *pdev = NULL;
 120         struct anatop *adata = NULL;
 121
 122         np = of_find_compatible_node(NULL, NULL, "fsl,imx6q-anatop");
 123         if (np)
 124                 pdev = of_find_device_by_node(np);
 125         if (pdev)
 126                 adata = platform_get_drvdata(pdev);
 127         if (!adata) {
 128                 if (np)
 129                         of_node_put(np);
 130                 return;
 131         }
 132
 133 #define HW_ANADIG_USB1_CHRG_DETECT              0x000001b0
 134 #define HW_ANADIG_USB2_CHRG_DETECT              0x00000210
 135
 136 #define BM_ANADIG_USB_CHRG_DETECT_EN_B          0x00100000
 137 #define BM_ANADIG_USB_CHRG_DETECT_CHK_CHRG_B    0x00080000
 138
 139         /*
 140          * The external charger detector needs to be disabled,
 141          * or the signal at DP will be poor
 142          */
 143         anatop_write_reg(adata, HW_ANADIG_USB1_CHRG_DETECT,
 144                         BM_ANADIG_USB_CHRG_DETECT_EN_B
 145                         | BM_ANADIG_USB_CHRG_DETECT_CHK_CHRG_B,
 146                         ~0);
 147         anatop_write_reg(adata, HW_ANADIG_USB2_CHRG_DETECT,
 148                         BM_ANADIG_USB_CHRG_DETECT_EN_B |
 149                         BM_ANADIG_USB_CHRG_DETECT_CHK_CHRG_B,
 150                         ~0);
 151
 152         of_node_put(np);
 153 }
 154
 155 static void __init imx6q_init_machine(void)
 156 {
 157         /*
 158          * This should be removed when all imx6q boards have pinctrl
 159          * states for devices defined in device tree.
 160          */
 161         pinctrl_provide_dummies();
 162
 163         if (of_machine_is_compatible("fsl,imx6q-sabrelite"))
 164                 imx6q_sabrelite_init();
 165
 166         of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
 167
 168         imx6q_pm_init();
 169         imx6q_usb_init();
 170 }
 171
 172 static void __init imx6q_map_io(void)
 173 {
 174         imx_lluart_map_io();
 175         imx_scu_map_io();
 176         imx6q_clock_map_io();
 177 }
 178
 179 static const struct of_device_id imx6q_irq_match[] __initconst = {
 180         { .compatible = "arm,cortex-a9-gic", .data = gic_of_init, },
 181         { /* sentinel */ }
 182 };
 183
 184 static void __init imx6q_init_irq(void)
 185 {
 186         l2x0_of_init(0, ~0UL);
 187         imx_src_init();
 188         imx_gpc_init();
 189         of_irq_init(imx6q_irq_match);
 190 }
 191
 192 static void __init imx6q_timer_init(void)
 193 {
 194         mx6q_clocks_init();
 195         twd_local_timer_of_register();
 196 }
 197
 198 static struct sys_timer imx6q_timer = {
 199         .init = imx6q_timer_init,
 200 };
 201
 202 static const char *imx6q_dt_compat[] __initdata = {
 203         "fsl,imx6q-arm2",
 204         "fsl,imx6q-sabrelite",
 205         "fsl,imx6q-sabresd",
 206         "fsl,imx6q",
 207         NULL,
 208 };
 209
 210 DT_MACHINE_START(IMX6Q, "Freescale i.MX6 Quad (Device Tree)")
 211         .map_io         = imx6q_map_io,
 212         .init_irq       = imx6q_init_irq,
 213         .handle_irq     = imx6q_handle_irq,
 214         .timer          = &imx6q_timer,
 215         .init_machine   = imx6q_init_machine,
 216         .dt_compat      = imx6q_dt_compat,
 217         .restart        = imx6q_restart,
 218 MACHINE_END