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/irqchip.h>
  22 #include <linux/of.h>
  23 #include <linux/of_address.h>
  24 #include <linux/of_irq.h>
  25 #include <linux/of_platform.h>
  26 #include <linux/phy.h>
  27 #include <linux/regmap.h>
  28 #include <linux/micrel_phy.h>
  29 #include <linux/mfd/syscon.h>
  30 #include <asm/cpuidle.h>
  31 #include <asm/smp_twd.h>
  32 #include <asm/hardware/cache-l2x0.h>
  33 #include <asm/mach/arch.h>
  34 #include <asm/mach/map.h>
  35 #include <asm/mach/time.h>
  36 #include <asm/system_misc.h>
  37
  38 #include "common.h"
  39 #include "cpuidle.h"
  40 #include "hardware.h"
  41
  42 #define IMX6Q_ANALOG_DIGPROG    0x260
  43
  44 static int imx6q_revision(void)
  45 {
  46         struct device_node *np;
  47         void __iomem *base;
  48         static u32 rev;
  49
  50         if (!rev) {
  51                 np = of_find_compatible_node(NULL, NULL, "fsl,imx6q-anatop");
  52                 if (!np)
  53                         return IMX_CHIP_REVISION_UNKNOWN;
  54                 base = of_iomap(np, 0);
  55                 if (!base) {
  56                         of_node_put(np);
  57                         return IMX_CHIP_REVISION_UNKNOWN;
  58                 }
  59                 rev =  readl_relaxed(base + IMX6Q_ANALOG_DIGPROG);
  60                 iounmap(base);
  61                 of_node_put(np);
  62         }
  63
  64         switch (rev & 0xff) {
  65         case 0:
  66                 return IMX_CHIP_REVISION_1_0;
  67         case 1:
  68                 return IMX_CHIP_REVISION_1_1;
  69         case 2:
  70                 return IMX_CHIP_REVISION_1_2;
  71         default:
  72                 return IMX_CHIP_REVISION_UNKNOWN;
  73         }
  74 }
  75
  76 void imx6q_restart(char mode, const char *cmd)
  77 {
  78         struct device_node *np;
  79         void __iomem *wdog_base;
  80
  81         np = of_find_compatible_node(NULL, NULL, "fsl,imx6q-wdt");
  82         wdog_base = of_iomap(np, 0);
  83         if (!wdog_base)
  84                 goto soft;
  85
  86         imx_src_prepare_restart();
  87
  88         /* enable wdog */
  89         writew_relaxed(1 << 2, wdog_base);
  90         /* write twice to ensure the request will not get ignored */
  91         writew_relaxed(1 << 2, wdog_base);
  92
  93         /* wait for reset to assert ... */
  94         mdelay(500);
  95
  96         pr_err("Watchdog reset failed to assert reset\n");
  97
  98         /* delay to allow the serial port to show the message */
  99         mdelay(50);
 100
 101 soft:
 102         /* we'll take a jump through zero as a poor second */
 103         soft_restart(0);
 104 }
 105
 106 /* For imx6q sabrelite board: set KSZ9021RN RGMII pad skew */
 107 static int ksz9021rn_phy_fixup(struct phy_device *phydev)
 108 {
 109         if (IS_BUILTIN(CONFIG_PHYLIB)) {
 110                 /* min rx data delay */
 111                 phy_write(phydev, 0x0b, 0x8105);
 112                 phy_write(phydev, 0x0c, 0x0000);
 113
 114                 /* max rx/tx clock delay, min rx/tx control delay */
 115                 phy_write(phydev, 0x0b, 0x8104);
 116                 phy_write(phydev, 0x0c, 0xf0f0);
 117                 phy_write(phydev, 0x0b, 0x104);
 118         }
 119
 120         return 0;
 121 }
 122
 123 static void __init imx6q_sabrelite_cko1_setup(void)
 124 {
 125         struct clk *cko1_sel, *ahb, *cko1;
 126         unsigned long rate;
 127
 128         cko1_sel = clk_get_sys(NULL, "cko1_sel");
 129         ahb = clk_get_sys(NULL, "ahb");
 130         cko1 = clk_get_sys(NULL, "cko1");
 131         if (IS_ERR(cko1_sel) || IS_ERR(ahb) || IS_ERR(cko1)) {
 132                 pr_err("cko1 setup failed!\n");
 133                 goto put_clk;
 134         }
 135         clk_set_parent(cko1_sel, ahb);
 136         rate = clk_round_rate(cko1, 16000000);
 137         clk_set_rate(cko1, rate);
 138 put_clk:
 139         if (!IS_ERR(cko1_sel))
 140                 clk_put(cko1_sel);
 141         if (!IS_ERR(ahb))
 142                 clk_put(ahb);
 143         if (!IS_ERR(cko1))
 144                 clk_put(cko1);
 145 }
 146
 147 static void __init imx6q_sabrelite_init(void)
 148 {
 149         if (IS_BUILTIN(CONFIG_PHYLIB))
 150                 phy_register_fixup_for_uid(PHY_ID_KSZ9021, MICREL_PHY_ID_MASK,
 151                                 ksz9021rn_phy_fixup);
 152         imx6q_sabrelite_cko1_setup();
 153 }
 154
 155 static void __init imx6q_1588_init(void)
 156 {
 157         struct regmap *gpr;
 158
 159         gpr = syscon_regmap_lookup_by_compatible("fsl,imx6q-iomuxc-gpr");
 160         if (!IS_ERR(gpr))
 161                 regmap_update_bits(gpr, 0x4, 1 << 21, 1 << 21);
 162         else
 163                 pr_err("failed to find fsl,imx6q-iomux-gpr regmap\n");
 164
 165 }
 166 static void __init imx6q_usb_init(void)
 167 {
 168         struct regmap *anatop;
 169
 170 #define HW_ANADIG_USB1_CHRG_DETECT              0x000001b0
 171 #define HW_ANADIG_USB2_CHRG_DETECT              0x00000210
 172
 173 #define BM_ANADIG_USB_CHRG_DETECT_EN_B          0x00100000
 174 #define BM_ANADIG_USB_CHRG_DETECT_CHK_CHRG_B    0x00080000
 175
 176         anatop = syscon_regmap_lookup_by_compatible("fsl,imx6q-anatop");
 177         if (!IS_ERR(anatop)) {
 178                 /*
 179                  * The external charger detector needs to be disabled,
 180                  * or the signal at DP will be poor
 181                  */
 182                 regmap_write(anatop, HW_ANADIG_USB1_CHRG_DETECT,
 183                                 BM_ANADIG_USB_CHRG_DETECT_EN_B
 184                                 | BM_ANADIG_USB_CHRG_DETECT_CHK_CHRG_B);
 185                 regmap_write(anatop, HW_ANADIG_USB2_CHRG_DETECT,
 186                                 BM_ANADIG_USB_CHRG_DETECT_EN_B |
 187                                 BM_ANADIG_USB_CHRG_DETECT_CHK_CHRG_B);
 188         } else {
 189                 pr_warn("failed to find fsl,imx6q-anatop regmap\n");
 190         }
 191 }
 192
 193 static void __init imx6q_init_machine(void)
 194 {
 195         if (of_machine_is_compatible("fsl,imx6q-sabrelite"))
 196                 imx6q_sabrelite_init();
 197
 198         of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
 199
 200         imx6q_pm_init();
 201         imx6q_usb_init();
 202         imx6q_1588_init();
 203 }
 204
 205 static struct cpuidle_driver imx6q_cpuidle_driver = {
 206         .name                   = "imx6q_cpuidle",
 207         .owner                  = THIS_MODULE,
 208         .en_core_tk_irqen       = 1,
 209         .states[0]              = ARM_CPUIDLE_WFI_STATE,
 210         .state_count            = 1,
 211 };
 212
 213 static void __init imx6q_init_late(void)
 214 {
 215         imx_cpuidle_init(&imx6q_cpuidle_driver);
 216 }
 217
 218 static void __init imx6q_map_io(void)
 219 {
 220         debug_ll_io_init();
 221         imx_scu_map_io();
 222 }
 223
 224 static void __init imx6q_init_irq(void)
 225 {
 226         l2x0_of_init(0, ~0UL);
 227         imx_src_init();
 228         imx_gpc_init();
 229         irqchip_init();
 230 }
 231
 232 static void __init imx6q_timer_init(void)
 233 {
 234         mx6q_clocks_init();
 235         twd_local_timer_of_register();
 236         imx_print_silicon_rev("i.MX6Q", imx6q_revision());
 237 }
 238
 239 static const char *imx6q_dt_compat[] __initdata = {
 240         "fsl,imx6q",
 241         NULL,
 242 };
 243
 244 DT_MACHINE_START(IMX6Q, "Freescale i.MX6 Quad (Device Tree)")
 245         .smp            = smp_ops(imx_smp_ops),
 246         .map_io         = imx6q_map_io,
 247         .init_irq       = imx6q_init_irq,
 248         .init_time      = imx6q_timer_init,
 249         .init_machine   = imx6q_init_machine,
 250         .init_late      = imx6q_init_late,
 251         .dt_compat      = imx6q_dt_compat,
 252         .restart        = imx6q_restart,
 253 MACHINE_END