arch/arm/mach-imx/mach-imx6q.c

   1 /*
   2  * Copyright 2011-2013 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/clk-provider.h>
  15 #include <linux/clkdev.h>
  16 #include <linux/clocksource.h>
  17 #include <linux/cpu.h>
  18 #include <linux/delay.h>
  19 #include <linux/export.h>
  20 #include <linux/init.h>
  21 #include <linux/io.h>
  22 #include <linux/irq.h>
  23 #include <linux/irqchip.h>
  24 #include <linux/of.h>
  25 #include <linux/of_address.h>
  26 #include <linux/of_irq.h>
  27 #include <linux/of_platform.h>
  28 #include <linux/pm_opp.h>
  29 #include <linux/phy.h>
  30 #include <linux/reboot.h>
  31 #include <linux/regmap.h>
  32 #include <linux/micrel_phy.h>
  33 #include <linux/mfd/syscon.h>
  34 #include <linux/mfd/syscon/imx6q-iomuxc-gpr.h>
  35 #include <asm/mach/arch.h>
  36 #include <asm/mach/map.h>
  37 #include <asm/system_misc.h>
  38
  39 #include "common.h"
  40 #include "cpuidle.h"
  41 #include "hardware.h"
  42
  43 static u32 chip_revision;
  44
  45 int imx6q_revision(void)
  46 {
  47         return chip_revision;
  48 }
  49
  50 static void __init imx6q_init_revision(void)
  51 {
  52         u32 rev = imx_anatop_get_digprog();
  53
  54         switch (rev & 0xff) {
  55         case 0:
  56                 chip_revision = IMX_CHIP_REVISION_1_0;
  57                 break;
  58         case 1:
  59                 chip_revision = IMX_CHIP_REVISION_1_1;
  60                 break;
  61         case 2:
  62                 chip_revision = IMX_CHIP_REVISION_1_2;
  63                 break;
  64         default:
  65                 chip_revision = IMX_CHIP_REVISION_UNKNOWN;
  66         }
  67
  68         mxc_set_cpu_type(rev >> 16 & 0xff);
  69 }
  70
  71 static void imx6q_restart(enum reboot_mode mode, const char *cmd)
  72 {
  73         struct device_node *np;
  74         void __iomem *wdog_base;
  75
  76         np = of_find_compatible_node(NULL, NULL, "fsl,imx6q-wdt");
  77         wdog_base = of_iomap(np, 0);
  78         if (!wdog_base)
  79                 goto soft;
  80
  81         imx_src_prepare_restart();
  82
  83         /* enable wdog */
  84         writew_relaxed(1 << 2, wdog_base);
  85         /* write twice to ensure the request will not get ignored */
  86         writew_relaxed(1 << 2, wdog_base);
  87
  88         /* wait for reset to assert ... */
  89         mdelay(500);
  90
  91         pr_err("Watchdog reset failed to assert reset\n");
  92
  93         /* delay to allow the serial port to show the message */
  94         mdelay(50);
  95
  96 soft:
  97         /* we'll take a jump through zero as a poor second */
  98         soft_restart(0);
  99 }
 100
 101 /* For imx6q sabrelite board: set KSZ9021RN RGMII pad skew */
 102 static int ksz9021rn_phy_fixup(struct phy_device *phydev)
 103 {
 104         if (IS_BUILTIN(CONFIG_PHYLIB)) {
 105                 /* min rx data delay */
 106                 phy_write(phydev, MICREL_KSZ9021_EXTREG_CTRL,
 107                         0x8000 | MICREL_KSZ9021_RGMII_RX_DATA_PAD_SCEW);
 108                 phy_write(phydev, MICREL_KSZ9021_EXTREG_DATA_WRITE, 0x0000);
 109
 110                 /* max rx/tx clock delay, min rx/tx control delay */
 111                 phy_write(phydev, MICREL_KSZ9021_EXTREG_CTRL,
 112                         0x8000 | MICREL_KSZ9021_RGMII_CLK_CTRL_PAD_SCEW);
 113                 phy_write(phydev, MICREL_KSZ9021_EXTREG_DATA_WRITE, 0xf0f0);
 114                 phy_write(phydev, MICREL_KSZ9021_EXTREG_CTRL,
 115                         MICREL_KSZ9021_RGMII_CLK_CTRL_PAD_SCEW);
 116         }
 117
 118         return 0;
 119 }
 120
 121 static void mmd_write_reg(struct phy_device *dev, int device, int reg, int val)
 122 {
 123         phy_write(dev, 0x0d, device);
 124         phy_write(dev, 0x0e, reg);
 125         phy_write(dev, 0x0d, (1 << 14) | device);
 126         phy_write(dev, 0x0e, val);
 127 }
 128
 129 static int ksz9031rn_phy_fixup(struct phy_device *dev)
 130 {
 131         /*
 132          * min rx data delay, max rx/tx clock delay,
 133          * min rx/tx control delay
 134          */
 135         mmd_write_reg(dev, 2, 4, 0);
 136         mmd_write_reg(dev, 2, 5, 0);
 137         mmd_write_reg(dev, 2, 8, 0x003ff);
 138
 139         return 0;
 140 }
 141
 142 static int ar8031_phy_fixup(struct phy_device *dev)
 143 {
 144         u16 val;
 145
 146         /* To enable AR8031 output a 125MHz clk from CLK_25M */
 147         phy_write(dev, 0xd, 0x7);
 148         phy_write(dev, 0xe, 0x8016);
 149         phy_write(dev, 0xd, 0x4007);
 150
 151         val = phy_read(dev, 0xe);
 152         val &= 0xffe3;
 153         val |= 0x18;
 154         phy_write(dev, 0xe, val);
 155
 156         /* introduce tx clock delay */
 157         phy_write(dev, 0x1d, 0x5);
 158         val = phy_read(dev, 0x1e);
 159         val |= 0x0100;
 160         phy_write(dev, 0x1e, val);
 161
 162         return 0;
 163 }
 164
 165 #define PHY_ID_AR8031   0x004dd074
 166
 167 static void __init imx6q_enet_phy_init(void)
 168 {
 169         if (IS_BUILTIN(CONFIG_PHYLIB)) {
 170                 phy_register_fixup_for_uid(PHY_ID_KSZ9021, MICREL_PHY_ID_MASK,
 171                                 ksz9021rn_phy_fixup);
 172                 phy_register_fixup_for_uid(PHY_ID_KSZ9031, MICREL_PHY_ID_MASK,
 173                                 ksz9031rn_phy_fixup);
 174                 phy_register_fixup_for_uid(PHY_ID_AR8031, 0xffffffff,
 175                                 ar8031_phy_fixup);
 176         }
 177 }
 178
 179 static void __init imx6q_1588_init(void)
 180 {
 181         struct regmap *gpr;
 182
 183         gpr = syscon_regmap_lookup_by_compatible("fsl,imx6q-iomuxc-gpr");
 184         if (!IS_ERR(gpr))
 185                 regmap_update_bits(gpr, IOMUXC_GPR1,
 186                                 IMX6Q_GPR1_ENET_CLK_SEL_MASK,
 187                                 IMX6Q_GPR1_ENET_CLK_SEL_ANATOP);
 188         else
 189                 pr_err("failed to find fsl,imx6q-iomux-gpr regmap\n");
 190
 191 }
 192
 193 static void __init imx6q_init_machine(void)
 194 {
 195         imx6q_enet_phy_init();
 196
 197         of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
 198
 199         imx_anatop_init();
 200         imx6q_pm_init();
 201         imx6q_1588_init();
 202 }
 203
 204 #define OCOTP_CFG3                      0x440
 205 #define OCOTP_CFG3_SPEED_SHIFT          16
 206 #define OCOTP_CFG3_SPEED_1P2GHZ         0x3
 207
 208 static void __init imx6q_opp_check_1p2ghz(struct device *cpu_dev)
 209 {
 210         struct device_node *np;
 211         void __iomem *base;
 212         u32 val;
 213
 214         np = of_find_compatible_node(NULL, NULL, "fsl,imx6q-ocotp");
 215         if (!np) {
 216                 pr_warn("failed to find ocotp node\n");
 217                 return;
 218         }
 219
 220         base = of_iomap(np, 0);
 221         if (!base) {
 222                 pr_warn("failed to map ocotp\n");
 223                 goto put_node;
 224         }
 225
 226         val = readl_relaxed(base + OCOTP_CFG3);
 227         val >>= OCOTP_CFG3_SPEED_SHIFT;
 228         if ((val & 0x3) != OCOTP_CFG3_SPEED_1P2GHZ)
 229                 if (dev_pm_opp_disable(cpu_dev, 1200000000))
 230                         pr_warn("failed to disable 1.2 GHz OPP\n");
 231
 232 put_node:
 233         of_node_put(np);
 234 }
 235
 236 static void __init imx6q_opp_init(void)
 237 {
 238         struct device_node *np;
 239         struct device *cpu_dev = get_cpu_device(0);
 240
 241         if (!cpu_dev) {
 242                 pr_warn("failed to get cpu0 device\n");
 243                 return;
 244         }
 245         np = of_node_get(cpu_dev->of_node);
 246         if (!np) {
 247                 pr_warn("failed to find cpu0 node\n");
 248                 return;
 249         }
 250
 251         if (of_init_opp_table(cpu_dev)) {
 252                 pr_warn("failed to init OPP table\n");
 253                 goto put_node;
 254         }
 255
 256         imx6q_opp_check_1p2ghz(cpu_dev);
 257
 258 put_node:
 259         of_node_put(np);
 260 }
 261
 262 static struct platform_device imx6q_cpufreq_pdev = {
 263         .name = "imx6q-cpufreq",
 264 };
 265
 266 static void __init imx6q_init_late(void)
 267 {
 268         /*
 269          * WAIT mode is broken on TO 1.0 and 1.1, so there is no point
 270          * to run cpuidle on them.
 271          */
 272         if (imx6q_revision() > IMX_CHIP_REVISION_1_1)
 273                 imx6q_cpuidle_init();
 274
 275         if (IS_ENABLED(CONFIG_ARM_IMX6Q_CPUFREQ)) {
 276                 imx6q_opp_init();
 277                 platform_device_register(&imx6q_cpufreq_pdev);
 278         }
 279 }
 280
 281 static void __init imx6q_map_io(void)
 282 {
 283         debug_ll_io_init();
 284         imx_scu_map_io();
 285 }
 286
 287 static void __init imx6q_init_irq(void)
 288 {
 289         imx6q_init_revision();
 290         imx_init_l2cache();
 291         imx_src_init();
 292         imx_gpc_init();
 293         irqchip_init();
 294 }
 295
 296 static void __init imx6q_timer_init(void)
 297 {
 298         of_clk_init(NULL);
 299         clocksource_of_init();
 300         imx_print_silicon_rev(cpu_is_imx6dl() ? "i.MX6DL" : "i.MX6Q",
 301                               imx6q_revision());
 302 }
 303
 304 static const char *imx6q_dt_compat[] __initdata = {
 305         "fsl,imx6dl",
 306         "fsl,imx6q",
 307         NULL,
 308 };
 309
 310 DT_MACHINE_START(IMX6Q, "Freescale i.MX6 Quad/DualLite (Device Tree)")
 311         .smp            = smp_ops(imx_smp_ops),
 312         .map_io         = imx6q_map_io,
 313         .init_irq       = imx6q_init_irq,
 314         .init_time      = imx6q_timer_init,
 315         .init_machine   = imx6q_init_machine,
 316         .init_late      = imx6q_init_late,
 317         .dt_compat      = imx6q_dt_compat,
 318         .restart        = imx6q_restart,
 319 MACHINE_END