Pileus Git - ~andy/linux/blob - 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/cpuidle.h>
  16 #include <linux/delay.h>
  17 #include <linux/export.h>
  18 #include <linux/init.h>
  19 #include <linux/io.h>
  20 #include <linux/irq.h>
  21 #include <linux/of.h>
  22 #include <linux/of_address.h>
  23 #include <linux/of_irq.h>
  24 #include <linux/of_platform.h>
  25 #include <linux/phy.h>
  26 #include <linux/micrel_phy.h>
  27 #include <linux/mfd/anatop.h>
  28 #include <asm/cpuidle.h>
  29 #include <asm/smp_twd.h>
  30 #include <asm/hardware/cache-l2x0.h>
  31 #include <asm/hardware/gic.h>
  32 #include <asm/mach/arch.h>
  33 #include <asm/mach/time.h>
  34 #include <asm/system_misc.h>
  35 #include <mach/common.h>
  36 #include <mach/cpuidle.h>
  37 #include <mach/hardware.h>
  38
  39
  40 void imx6q_restart(char mode, const char *cmd)
  41 {
  42         struct device_node *np;
  43         void __iomem *wdog_base;
  44
  45         np = of_find_compatible_node(NULL, NULL, "fsl,imx6q-wdt");
  46         wdog_base = of_iomap(np, 0);
  47         if (!wdog_base)
  48                 goto soft;
  49
  50         imx_src_prepare_restart();
  51
  52         /* enable wdog */
  53         writew_relaxed(1 << 2, wdog_base);
  54         /* write twice to ensure the request will not get ignored */
  55         writew_relaxed(1 << 2, wdog_base);
  56
  57         /* wait for reset to assert ... */
  58         mdelay(500);
  59
  60         pr_err("Watchdog reset failed to assert reset\n");
  61
  62         /* delay to allow the serial port to show the message */
  63         mdelay(50);
  64
  65 soft:
  66         /* we'll take a jump through zero as a poor second */
  67         soft_restart(0);
  68 }
  69
  70 /* For imx6q sabrelite board: set KSZ9021RN RGMII pad skew */
  71 static int ksz9021rn_phy_fixup(struct phy_device *phydev)
  72 {
  73         if (IS_BUILTIN(CONFIG_PHYLIB)) {
  74                 /* min rx data delay */
  75                 phy_write(phydev, 0x0b, 0x8105);
  76                 phy_write(phydev, 0x0c, 0x0000);
  77
  78                 /* max rx/tx clock delay, min rx/tx control delay */
  79                 phy_write(phydev, 0x0b, 0x8104);
  80                 phy_write(phydev, 0x0c, 0xf0f0);
  81                 phy_write(phydev, 0x0b, 0x104);
  82         }
  83
  84         return 0;
  85 }
  86
  87 static void __init imx6q_sabrelite_cko1_setup(void)
  88 {
  89         struct clk *cko1_sel, *ahb, *cko1;
  90         unsigned long rate;
  91
  92         cko1_sel = clk_get_sys(NULL, "cko1_sel");
  93         ahb = clk_get_sys(NULL, "ahb");
  94         cko1 = clk_get_sys(NULL, "cko1");
  95         if (IS_ERR(cko1_sel) || IS_ERR(ahb) || IS_ERR(cko1)) {
  96                 pr_err("cko1 setup failed!\n");
  97                 goto put_clk;
  98         }
  99         clk_set_parent(cko1_sel, ahb);
 100         rate = clk_round_rate(cko1, 16000000);
 101         clk_set_rate(cko1, rate);
 102 put_clk:
 103         if (!IS_ERR(cko1_sel))
 104                 clk_put(cko1_sel);
 105         if (!IS_ERR(ahb))
 106                 clk_put(ahb);
 107         if (!IS_ERR(cko1))
 108                 clk_put(cko1);
 109 }
 110
 111 static void __init imx6q_sabrelite_init(void)
 112 {
 113         if (IS_BUILTIN(CONFIG_PHYLIB))
 114                 phy_register_fixup_for_uid(PHY_ID_KSZ9021, MICREL_PHY_ID_MASK,
 115                                 ksz9021rn_phy_fixup);
 116         imx6q_sabrelite_cko1_setup();
 117 }
 118
 119 static void __init imx6q_usb_init(void)
 120 {
 121         struct device_node *np;
 122         struct platform_device *pdev = NULL;
 123         struct anatop *adata = NULL;
 124
 125         np = of_find_compatible_node(NULL, NULL, "fsl,imx6q-anatop");
 126         if (np)
 127                 pdev = of_find_device_by_node(np);
 128         if (pdev)
 129                 adata = platform_get_drvdata(pdev);
 130         if (!adata) {
 131                 if (np)
 132                         of_node_put(np);
 133                 return;
 134         }
 135
 136 #define HW_ANADIG_USB1_CHRG_DETECT              0x000001b0
 137 #define HW_ANADIG_USB2_CHRG_DETECT              0x00000210
 138
 139 #define BM_ANADIG_USB_CHRG_DETECT_EN_B          0x00100000
 140 #define BM_ANADIG_USB_CHRG_DETECT_CHK_CHRG_B    0x00080000
 141
 142         /*
 143          * The external charger detector needs to be disabled,
 144          * or the signal at DP will be poor
 145          */
 146         anatop_write_reg(adata, HW_ANADIG_USB1_CHRG_DETECT,
 147                         BM_ANADIG_USB_CHRG_DETECT_EN_B
 148                         | BM_ANADIG_USB_CHRG_DETECT_CHK_CHRG_B,
 149                         ~0);
 150         anatop_write_reg(adata, HW_ANADIG_USB2_CHRG_DETECT,
 151                         BM_ANADIG_USB_CHRG_DETECT_EN_B |
 152                         BM_ANADIG_USB_CHRG_DETECT_CHK_CHRG_B,
 153                         ~0);
 154
 155         of_node_put(np);
 156 }
 157
 158 static void __init imx6q_init_machine(void)
 159 {
 160         if (of_machine_is_compatible("fsl,imx6q-sabrelite"))
 161                 imx6q_sabrelite_init();
 162
 163         of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
 164
 165         imx6q_pm_init();
 166         imx6q_usb_init();
 167 }
 168
 169 static struct cpuidle_driver imx6q_cpuidle_driver = {
 170         .name                   = "imx6q_cpuidle",
 171         .owner                  = THIS_MODULE,
 172         .en_core_tk_irqen       = 1,
 173         .states[0]              = ARM_CPUIDLE_WFI_STATE,
 174         .state_count            = 1,
 175 };
 176
 177 static void __init imx6q_init_late(void)
 178 {
 179         imx_cpuidle_init(&imx6q_cpuidle_driver);
 180 }
 181
 182 static void __init imx6q_map_io(void)
 183 {
 184         imx_lluart_map_io();
 185         imx_scu_map_io();
 186         imx6q_clock_map_io();
 187 }
 188
 189 static const struct of_device_id imx6q_irq_match[] __initconst = {
 190         { .compatible = "arm,cortex-a9-gic", .data = gic_of_init, },
 191         { /* sentinel */ }
 192 };
 193
 194 static void __init imx6q_init_irq(void)
 195 {
 196         l2x0_of_init(0, ~0UL);
 197         imx_src_init();
 198         imx_gpc_init();
 199         of_irq_init(imx6q_irq_match);
 200 }
 201
 202 static void __init imx6q_timer_init(void)
 203 {
 204         mx6q_clocks_init();
 205         twd_local_timer_of_register();
 206 }
 207
 208 static struct sys_timer imx6q_timer = {
 209         .init = imx6q_timer_init,
 210 };
 211
 212 static const char *imx6q_dt_compat[] __initdata = {
 213         "fsl,imx6q",
 214         NULL,
 215 };
 216
 217 DT_MACHINE_START(IMX6Q, "Freescale i.MX6 Quad (Device Tree)")
 218         .smp            = smp_ops(imx_smp_ops),
 219         .map_io         = imx6q_map_io,
 220         .init_irq       = imx6q_init_irq,
 221         .handle_irq     = imx6q_handle_irq,
 222         .timer          = &imx6q_timer,
 223         .init_machine   = imx6q_init_machine,
 224         .init_late      = imx6q_init_late,
 225         .dt_compat      = imx6q_dt_compat,
 226         .restart        = imx6q_restart,
 227 MACHINE_END