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/clkdev.h>
  15 #include <linux/cpu.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/pm_opp.h>
  27 #include <linux/pci.h>
  28 #include <linux/phy.h>
  29 #include <linux/reboot.h>
  30 #include <linux/regmap.h>
  31 #include <linux/micrel_phy.h>
  32 #include <linux/mfd/syscon.h>
  33 #include <linux/mfd/syscon/imx6q-iomuxc-gpr.h>
  34 #include <asm/mach/arch.h>
  35 #include <asm/mach/map.h>
  36 #include <asm/system_misc.h>
  37
  38 #include "common.h"
  39 #include "cpuidle.h"
  40 #include "hardware.h"
  41
  42 /* For imx6q sabrelite board: set KSZ9021RN RGMII pad skew */
  43 static int ksz9021rn_phy_fixup(struct phy_device *phydev)
  44 {
  45         if (IS_BUILTIN(CONFIG_PHYLIB)) {
  46                 /* min rx data delay */
  47                 phy_write(phydev, MICREL_KSZ9021_EXTREG_CTRL,
  48                         0x8000 | MICREL_KSZ9021_RGMII_RX_DATA_PAD_SCEW);
  49                 phy_write(phydev, MICREL_KSZ9021_EXTREG_DATA_WRITE, 0x0000);
  50
  51                 /* max rx/tx clock delay, min rx/tx control delay */
  52                 phy_write(phydev, MICREL_KSZ9021_EXTREG_CTRL,
  53                         0x8000 | MICREL_KSZ9021_RGMII_CLK_CTRL_PAD_SCEW);
  54                 phy_write(phydev, MICREL_KSZ9021_EXTREG_DATA_WRITE, 0xf0f0);
  55                 phy_write(phydev, MICREL_KSZ9021_EXTREG_CTRL,
  56                         MICREL_KSZ9021_RGMII_CLK_CTRL_PAD_SCEW);
  57         }
  58
  59         return 0;
  60 }
  61
  62 static void mmd_write_reg(struct phy_device *dev, int device, int reg, int val)
  63 {
  64         phy_write(dev, 0x0d, device);
  65         phy_write(dev, 0x0e, reg);
  66         phy_write(dev, 0x0d, (1 << 14) | device);
  67         phy_write(dev, 0x0e, val);
  68 }
  69
  70 static int ksz9031rn_phy_fixup(struct phy_device *dev)
  71 {
  72         /*
  73          * min rx data delay, max rx/tx clock delay,
  74          * min rx/tx control delay
  75          */
  76         mmd_write_reg(dev, 2, 4, 0);
  77         mmd_write_reg(dev, 2, 5, 0);
  78         mmd_write_reg(dev, 2, 8, 0x003ff);
  79
  80         return 0;
  81 }
  82
  83 /*
  84  * fixup for PLX PEX8909 bridge to configure GPIO1-7 as output High
  85  * as they are used for slots1-7 PERST#
  86  */
  87 static void ventana_pciesw_early_fixup(struct pci_dev *dev)
  88 {
  89         u32 dw;
  90
  91         if (!of_machine_is_compatible("gw,ventana"))
  92                 return;
  93
  94         if (dev->devfn != 0)
  95                 return;
  96
  97         pci_read_config_dword(dev, 0x62c, &dw);
  98         dw |= 0xaaa8; // GPIO1-7 outputs
  99         pci_write_config_dword(dev, 0x62c, dw);
 100
 101         pci_read_config_dword(dev, 0x644, &dw);
 102         dw |= 0xfe;   // GPIO1-7 output high
 103         pci_write_config_dword(dev, 0x644, dw);
 104
 105         msleep(100);
 106 }
 107 DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_PLX, 0x8609, ventana_pciesw_early_fixup);
 108 DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_PLX, 0x8606, ventana_pciesw_early_fixup);
 109 DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_PLX, 0x8604, ventana_pciesw_early_fixup);
 110
 111 static int ar8031_phy_fixup(struct phy_device *dev)
 112 {
 113         u16 val;
 114
 115         /* To enable AR8031 output a 125MHz clk from CLK_25M */
 116         phy_write(dev, 0xd, 0x7);
 117         phy_write(dev, 0xe, 0x8016);
 118         phy_write(dev, 0xd, 0x4007);
 119
 120         val = phy_read(dev, 0xe);
 121         val &= 0xffe3;
 122         val |= 0x18;
 123         phy_write(dev, 0xe, val);
 124
 125         /* introduce tx clock delay */
 126         phy_write(dev, 0x1d, 0x5);
 127         val = phy_read(dev, 0x1e);
 128         val |= 0x0100;
 129         phy_write(dev, 0x1e, val);
 130
 131         return 0;
 132 }
 133
 134 #define PHY_ID_AR8031   0x004dd074
 135
 136 static int ar8035_phy_fixup(struct phy_device *dev)
 137 {
 138         u16 val;
 139
 140         /* Ar803x phy SmartEEE feature cause link status generates glitch,
 141          * which cause ethernet link down/up issue, so disable SmartEEE
 142          */
 143         phy_write(dev, 0xd, 0x3);
 144         phy_write(dev, 0xe, 0x805d);
 145         phy_write(dev, 0xd, 0x4003);
 146
 147         val = phy_read(dev, 0xe);
 148         phy_write(dev, 0xe, val & ~(1 << 8));
 149
 150         /*
 151          * Enable 125MHz clock from CLK_25M on the AR8031.  This
 152          * is fed in to the IMX6 on the ENET_REF_CLK (V22) pad.
 153          * Also, introduce a tx clock delay.
 154          *
 155          * This is the same as is the AR8031 fixup.
 156          */
 157         ar8031_phy_fixup(dev);
 158
 159         /*check phy power*/
 160         val = phy_read(dev, 0x0);
 161         if (val & BMCR_PDOWN)
 162                 phy_write(dev, 0x0, val & ~BMCR_PDOWN);
 163
 164         return 0;
 165 }
 166
 167 #define PHY_ID_AR8035 0x004dd072
 168
 169 static void __init imx6q_enet_phy_init(void)
 170 {
 171         if (IS_BUILTIN(CONFIG_PHYLIB)) {
 172                 phy_register_fixup_for_uid(PHY_ID_KSZ9021, MICREL_PHY_ID_MASK,
 173                                 ksz9021rn_phy_fixup);
 174                 phy_register_fixup_for_uid(PHY_ID_KSZ9031, MICREL_PHY_ID_MASK,
 175                                 ksz9031rn_phy_fixup);
 176                 phy_register_fixup_for_uid(PHY_ID_AR8031, 0xffffffff,
 177                                 ar8031_phy_fixup);
 178                 phy_register_fixup_for_uid(PHY_ID_AR8035, 0xffffffef,
 179                                 ar8035_phy_fixup);
 180         }
 181 }
 182
 183 static void __init imx6q_1588_init(void)
 184 {
 185         struct device_node *np;
 186         struct clk *ptp_clk;
 187         struct clk *enet_ref;
 188         struct regmap *gpr;
 189         u32 clksel;
 190
 191         np = of_find_compatible_node(NULL, NULL, "fsl,imx6q-fec");
 192         if (!np) {
 193                 pr_warn("%s: failed to find fec node\n", __func__);
 194                 return;
 195         }
 196
 197         ptp_clk = of_clk_get(np, 2);
 198         if (IS_ERR(ptp_clk)) {
 199                 pr_warn("%s: failed to get ptp clock\n", __func__);
 200                 goto put_node;
 201         }
 202
 203         enet_ref = clk_get_sys(NULL, "enet_ref");
 204         if (IS_ERR(enet_ref)) {
 205                 pr_warn("%s: failed to get enet clock\n", __func__);
 206                 goto put_ptp_clk;
 207         }
 208
 209         /*
 210          * If enet_ref from ANATOP/CCM is the PTP clock source, we need to
 211          * set bit IOMUXC_GPR1[21].  Or the PTP clock must be from pad
 212          * (external OSC), and we need to clear the bit.
 213          */
 214         clksel = ptp_clk == enet_ref ? IMX6Q_GPR1_ENET_CLK_SEL_ANATOP :
 215                                        IMX6Q_GPR1_ENET_CLK_SEL_PAD;
 216         gpr = syscon_regmap_lookup_by_compatible("fsl,imx6q-iomuxc-gpr");
 217         if (!IS_ERR(gpr))
 218                 regmap_update_bits(gpr, IOMUXC_GPR1,
 219                                 IMX6Q_GPR1_ENET_CLK_SEL_MASK,
 220                                 clksel);
 221         else
 222                 pr_err("failed to find fsl,imx6q-iomux-gpr regmap\n");
 223
 224         clk_put(enet_ref);
 225 put_ptp_clk:
 226         clk_put(ptp_clk);
 227 put_node:
 228         of_node_put(np);
 229 }
 230
 231 static void __init imx6q_axi_init(void)
 232 {
 233         struct regmap *gpr;
 234         unsigned int mask;
 235
 236         gpr = syscon_regmap_lookup_by_compatible("fsl,imx6q-iomuxc-gpr");
 237         if (!IS_ERR(gpr)) {
 238                 /*
 239                  * Enable the cacheable attribute of VPU and IPU
 240                  * AXI transactions.
 241                  */
 242                 mask = IMX6Q_GPR4_VPU_WR_CACHE_SEL |
 243                         IMX6Q_GPR4_VPU_RD_CACHE_SEL |
 244                         IMX6Q_GPR4_VPU_P_WR_CACHE_VAL |
 245                         IMX6Q_GPR4_VPU_P_RD_CACHE_VAL_MASK |
 246                         IMX6Q_GPR4_IPU_WR_CACHE_CTL |
 247                         IMX6Q_GPR4_IPU_RD_CACHE_CTL;
 248                 regmap_update_bits(gpr, IOMUXC_GPR4, mask, mask);
 249
 250                 /* Increase IPU read QoS priority */
 251                 regmap_update_bits(gpr, IOMUXC_GPR6,
 252                                 IMX6Q_GPR6_IPU1_ID00_RD_QOS_MASK |
 253                                 IMX6Q_GPR6_IPU1_ID01_RD_QOS_MASK,
 254                                 (0xf << 16) | (0x7 << 20));
 255                 regmap_update_bits(gpr, IOMUXC_GPR7,
 256                                 IMX6Q_GPR7_IPU2_ID00_RD_QOS_MASK |
 257                                 IMX6Q_GPR7_IPU2_ID01_RD_QOS_MASK,
 258                                 (0xf << 16) | (0x7 << 20));
 259         } else {
 260                 pr_warn("failed to find fsl,imx6q-iomuxc-gpr regmap\n");
 261         }
 262 }
 263
 264 static void __init imx6q_init_machine(void)
 265 {
 266         struct device *parent;
 267
 268         imx_print_silicon_rev(cpu_is_imx6dl() ? "i.MX6DL" : "i.MX6Q",
 269                               imx_get_soc_revision());
 270
 271         mxc_arch_reset_init_dt();
 272
 273         parent = imx_soc_device_init();
 274         if (parent == NULL)
 275                 pr_warn("failed to initialize soc device\n");
 276
 277         imx6q_enet_phy_init();
 278
 279         of_platform_populate(NULL, of_default_bus_match_table, NULL, parent);
 280
 281         imx_anatop_init();
 282         cpu_is_imx6q() ?  imx6q_pm_init() : imx6dl_pm_init();
 283         imx6q_1588_init();
 284         imx6q_axi_init();
 285 }
 286
 287 #define OCOTP_CFG3                      0x440
 288 #define OCOTP_CFG3_SPEED_SHIFT          16
 289 #define OCOTP_CFG3_SPEED_1P2GHZ         0x3
 290 #define OCOTP_CFG3_SPEED_996MHZ         0x2
 291 #define OCOTP_CFG3_SPEED_852MHZ         0x1
 292
 293 static void __init imx6q_opp_check_speed_grading(struct device *cpu_dev)
 294 {
 295         struct device_node *np;
 296         void __iomem *base;
 297         u32 val;
 298
 299         np = of_find_compatible_node(NULL, NULL, "fsl,imx6q-ocotp");
 300         if (!np) {
 301                 pr_warn("failed to find ocotp node\n");
 302                 return;
 303         }
 304
 305         base = of_iomap(np, 0);
 306         if (!base) {
 307                 pr_warn("failed to map ocotp\n");
 308                 goto put_node;
 309         }
 310
 311         /*
 312          * SPEED_GRADING[1:0] defines the max speed of ARM:
 313          * 2b'11: 1200000000Hz;
 314          * 2b'10: 996000000Hz;
 315          * 2b'01: 852000000Hz; -- i.MX6Q Only, exclusive with 996MHz.
 316          * 2b'00: 792000000Hz;
 317          * We need to set the max speed of ARM according to fuse map.
 318          */
 319         val = readl_relaxed(base + OCOTP_CFG3);
 320         val >>= OCOTP_CFG3_SPEED_SHIFT;
 321         val &= 0x3;
 322
 323         if (val != OCOTP_CFG3_SPEED_1P2GHZ)
 324                 if (dev_pm_opp_disable(cpu_dev, 1200000000))
 325                         pr_warn("failed to disable 1.2 GHz OPP\n");
 326         if (val < OCOTP_CFG3_SPEED_996MHZ)
 327                 if (dev_pm_opp_disable(cpu_dev, 996000000))
 328                         pr_warn("failed to disable 996 MHz OPP\n");
 329         if (cpu_is_imx6q()) {
 330                 if (val != OCOTP_CFG3_SPEED_852MHZ)
 331                         if (dev_pm_opp_disable(cpu_dev, 852000000))
 332                                 pr_warn("failed to disable 852 MHz OPP\n");
 333         }
 334
 335 put_node:
 336         of_node_put(np);
 337 }
 338
 339 static void __init imx6q_opp_init(void)
 340 {
 341         struct device_node *np;
 342         struct device *cpu_dev = get_cpu_device(0);
 343
 344         if (!cpu_dev) {
 345                 pr_warn("failed to get cpu0 device\n");
 346                 return;
 347         }
 348         np = of_node_get(cpu_dev->of_node);
 349         if (!np) {
 350                 pr_warn("failed to find cpu0 node\n");
 351                 return;
 352         }
 353
 354         if (of_init_opp_table(cpu_dev)) {
 355                 pr_warn("failed to init OPP table\n");
 356                 goto put_node;
 357         }
 358
 359         imx6q_opp_check_speed_grading(cpu_dev);
 360
 361 put_node:
 362         of_node_put(np);
 363 }
 364
 365 static struct platform_device imx6q_cpufreq_pdev = {
 366         .name = "imx6q-cpufreq",
 367 };
 368
 369 static void __init imx6q_init_late(void)
 370 {
 371         /*
 372          * WAIT mode is broken on TO 1.0 and 1.1, so there is no point
 373          * to run cpuidle on them.
 374          */
 375         if (imx_get_soc_revision() > IMX_CHIP_REVISION_1_1)
 376                 imx6q_cpuidle_init();
 377
 378         if (IS_ENABLED(CONFIG_ARM_IMX6Q_CPUFREQ)) {
 379                 imx6q_opp_init();
 380                 platform_device_register(&imx6q_cpufreq_pdev);
 381         }
 382 }
 383
 384 static void __init imx6q_map_io(void)
 385 {
 386         debug_ll_io_init();
 387         imx_scu_map_io();
 388 }
 389
 390 static void __init imx6q_init_irq(void)
 391 {
 392         imx_init_revision_from_anatop();
 393         imx_init_l2cache();
 394         imx_src_init();
 395         imx_gpc_init();
 396         irqchip_init();
 397 }
 398
 399 static const char *imx6q_dt_compat[] __initconst = {
 400         "fsl,imx6dl",
 401         "fsl,imx6q",
 402         NULL,
 403 };
 404
 405 DT_MACHINE_START(IMX6Q, "Freescale i.MX6 Quad/DualLite (Device Tree)")
 406         .smp            = smp_ops(imx_smp_ops),
 407         .map_io         = imx6q_map_io,
 408         .init_irq       = imx6q_init_irq,
 409         .init_machine   = imx6q_init_machine,
 410         .init_late      = imx6q_init_late,
 411         .dt_compat      = imx6q_dt_compat,
 412         .restart        = mxc_restart,
 413 MACHINE_END