arch/arm/mach-tegra/tegra124/xusb-padctl.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (c) 2014-2015, NVIDIA CORPORATION.  All rights reserved.
   4  */
   5
   6 #define pr_fmt(fmt) "tegra-xusb-padctl: " fmt
   7
   8 #include <common.h>
   9 #include <errno.h>
  10 #include <log.h>
  11 #include <dm/of_access.h>
  12 #include <dm/ofnode.h>
  13
  14 #include "../xusb-padctl-common.h"
  15
  16 #include <dt-bindings/pinctrl/pinctrl-tegra-xusb.h>
  17
  18 #define XUSB_PADCTL_ELPG_PROGRAM 0x01c
  19 #define XUSB_PADCTL_ELPG_PROGRAM_AUX_MUX_LP0_VCORE_DOWN (1 << 26)
  20 #define XUSB_PADCTL_ELPG_PROGRAM_AUX_MUX_LP0_CLAMP_EN_EARLY (1 << 25)
  21 #define XUSB_PADCTL_ELPG_PROGRAM_AUX_MUX_LP0_CLAMP_EN (1 << 24)
  22
  23 #define XUSB_PADCTL_IOPHY_PLL_P0_CTL1 0x040
  24 #define XUSB_PADCTL_IOPHY_PLL_P0_CTL1_PLL0_LOCKDET (1 << 19)
  25 #define XUSB_PADCTL_IOPHY_PLL_P0_CTL1_REFCLK_SEL_MASK (0xf << 12)
  26 #define XUSB_PADCTL_IOPHY_PLL_P0_CTL1_PLL_RST (1 << 1)
  27
  28 #define XUSB_PADCTL_IOPHY_PLL_P0_CTL2 0x044
  29 #define XUSB_PADCTL_IOPHY_PLL_P0_CTL2_REFCLKBUF_EN (1 << 6)
  30 #define XUSB_PADCTL_IOPHY_PLL_P0_CTL2_TXCLKREF_EN (1 << 5)
  31 #define XUSB_PADCTL_IOPHY_PLL_P0_CTL2_TXCLKREF_SEL (1 << 4)
  32
  33 #define XUSB_PADCTL_IOPHY_PLL_S0_CTL1 0x138
  34 #define XUSB_PADCTL_IOPHY_PLL_S0_CTL1_PLL1_LOCKDET (1 << 27)
  35 #define XUSB_PADCTL_IOPHY_PLL_S0_CTL1_PLL1_MODE (1 << 24)
  36 #define XUSB_PADCTL_IOPHY_PLL_S0_CTL1_PLL_PWR_OVRD (1 << 3)
  37 #define XUSB_PADCTL_IOPHY_PLL_S0_CTL1_PLL_RST (1 << 1)
  38 #define XUSB_PADCTL_IOPHY_PLL_S0_CTL1_PLL_IDDQ (1 << 0)
  39
  40 #define XUSB_PADCTL_IOPHY_MISC_PAD_S0_CTL1 0x148
  41 #define XUSB_PADCTL_IOPHY_MISC_PAD_S0_CTL1_IDDQ_OVRD (1 << 1)
  42 #define XUSB_PADCTL_IOPHY_MISC_PAD_S0_CTL1_IDDQ (1 << 0)
  43
  44 enum tegra124_function {
  45         TEGRA124_FUNC_SNPS,
  46         TEGRA124_FUNC_XUSB,
  47         TEGRA124_FUNC_UART,
  48         TEGRA124_FUNC_PCIE,
  49         TEGRA124_FUNC_USB3,
  50         TEGRA124_FUNC_SATA,
  51         TEGRA124_FUNC_RSVD,
  52 };
  53
  54 static const char *const tegra124_functions[] = {
  55         "snps",
  56         "xusb",
  57         "uart",
  58         "pcie",
  59         "usb3",
  60         "sata",
  61         "rsvd",
  62 };
  63
  64 static const unsigned int tegra124_otg_functions[] = {
  65         TEGRA124_FUNC_SNPS,
  66         TEGRA124_FUNC_XUSB,
  67         TEGRA124_FUNC_UART,
  68         TEGRA124_FUNC_RSVD,
  69 };
  70
  71 static const unsigned int tegra124_usb_functions[] = {
  72         TEGRA124_FUNC_SNPS,
  73         TEGRA124_FUNC_XUSB,
  74 };
  75
  76 static const unsigned int tegra124_pci_functions[] = {
  77         TEGRA124_FUNC_PCIE,
  78         TEGRA124_FUNC_USB3,
  79         TEGRA124_FUNC_SATA,
  80         TEGRA124_FUNC_RSVD,
  81 };
  82
  83 #define TEGRA124_LANE(_name, _offset, _shift, _mask, _iddq, _funcs)     \
  84         {                                                               \
  85                 .name = _name,                                          \
  86                 .offset = _offset,                                      \
  87                 .shift = _shift,                                        \
  88                 .mask = _mask,                                          \
  89                 .iddq = _iddq,                                          \
  90                 .num_funcs = ARRAY_SIZE(tegra124_##_funcs##_functions), \
  91                 .funcs = tegra124_##_funcs##_functions,                 \
  92         }
  93
  94 static const struct tegra_xusb_padctl_lane tegra124_lanes[] = {
  95         TEGRA124_LANE("otg-0",  0x004,  0, 0x3, 0, otg),
  96         TEGRA124_LANE("otg-1",  0x004,  2, 0x3, 0, otg),
  97         TEGRA124_LANE("otg-2",  0x004,  4, 0x3, 0, otg),
  98         TEGRA124_LANE("ulpi-0", 0x004, 12, 0x1, 0, usb),
  99         TEGRA124_LANE("hsic-0", 0x004, 14, 0x1, 0, usb),
 100         TEGRA124_LANE("hsic-1", 0x004, 15, 0x1, 0, usb),
 101         TEGRA124_LANE("pcie-0", 0x134, 16, 0x3, 1, pci),
 102         TEGRA124_LANE("pcie-1", 0x134, 18, 0x3, 2, pci),
 103         TEGRA124_LANE("pcie-2", 0x134, 20, 0x3, 3, pci),
 104         TEGRA124_LANE("pcie-3", 0x134, 22, 0x3, 4, pci),
 105         TEGRA124_LANE("pcie-4", 0x134, 24, 0x3, 5, pci),
 106         TEGRA124_LANE("sata-0", 0x134, 26, 0x3, 6, pci),
 107 };
 108
 109 static int tegra_xusb_padctl_enable(struct tegra_xusb_padctl *padctl)
 110 {
 111         u32 value;
 112
 113         if (padctl->enable++ > 0)
 114                 return 0;
 115
 116         value = padctl_readl(padctl, XUSB_PADCTL_ELPG_PROGRAM);
 117         value &= ~XUSB_PADCTL_ELPG_PROGRAM_AUX_MUX_LP0_CLAMP_EN;
 118         padctl_writel(padctl, value, XUSB_PADCTL_ELPG_PROGRAM);
 119
 120         udelay(100);
 121
 122         value = padctl_readl(padctl, XUSB_PADCTL_ELPG_PROGRAM);
 123         value &= ~XUSB_PADCTL_ELPG_PROGRAM_AUX_MUX_LP0_CLAMP_EN_EARLY;
 124         padctl_writel(padctl, value, XUSB_PADCTL_ELPG_PROGRAM);
 125
 126         udelay(100);
 127
 128         value = padctl_readl(padctl, XUSB_PADCTL_ELPG_PROGRAM);
 129         value &= ~XUSB_PADCTL_ELPG_PROGRAM_AUX_MUX_LP0_VCORE_DOWN;
 130         padctl_writel(padctl, value, XUSB_PADCTL_ELPG_PROGRAM);
 131
 132         return 0;
 133 }
 134
 135 static int tegra_xusb_padctl_disable(struct tegra_xusb_padctl *padctl)
 136 {
 137         u32 value;
 138
 139         if (padctl->enable == 0) {
 140                 pr_err("unbalanced enable/disable");
 141                 return 0;
 142         }
 143
 144         if (--padctl->enable > 0)
 145                 return 0;
 146
 147         value = padctl_readl(padctl, XUSB_PADCTL_ELPG_PROGRAM);
 148         value |= XUSB_PADCTL_ELPG_PROGRAM_AUX_MUX_LP0_VCORE_DOWN;
 149         padctl_writel(padctl, value, XUSB_PADCTL_ELPG_PROGRAM);
 150
 151         udelay(100);
 152
 153         value = padctl_readl(padctl, XUSB_PADCTL_ELPG_PROGRAM);
 154         value |= XUSB_PADCTL_ELPG_PROGRAM_AUX_MUX_LP0_CLAMP_EN_EARLY;
 155         padctl_writel(padctl, value, XUSB_PADCTL_ELPG_PROGRAM);
 156
 157         udelay(100);
 158
 159         value = padctl_readl(padctl, XUSB_PADCTL_ELPG_PROGRAM);
 160         value |= XUSB_PADCTL_ELPG_PROGRAM_AUX_MUX_LP0_CLAMP_EN;
 161         padctl_writel(padctl, value, XUSB_PADCTL_ELPG_PROGRAM);
 162
 163         return 0;
 164 }
 165
 166 static int phy_prepare(struct tegra_xusb_phy *phy)
 167 {
 168         return tegra_xusb_padctl_enable(phy->padctl);
 169 }
 170
 171 static int phy_unprepare(struct tegra_xusb_phy *phy)
 172 {
 173         return tegra_xusb_padctl_disable(phy->padctl);
 174 }
 175
 176 static int pcie_phy_enable(struct tegra_xusb_phy *phy)
 177 {
 178         struct tegra_xusb_padctl *padctl = phy->padctl;
 179         int err = -ETIMEDOUT;
 180         unsigned long start;
 181         u32 value;
 182
 183         value = padctl_readl(padctl, XUSB_PADCTL_IOPHY_PLL_P0_CTL1);
 184         value &= ~XUSB_PADCTL_IOPHY_PLL_P0_CTL1_REFCLK_SEL_MASK;
 185         padctl_writel(padctl, value, XUSB_PADCTL_IOPHY_PLL_P0_CTL1);
 186
 187         value = padctl_readl(padctl, XUSB_PADCTL_IOPHY_PLL_P0_CTL2);
 188         value |= XUSB_PADCTL_IOPHY_PLL_P0_CTL2_REFCLKBUF_EN |
 189                  XUSB_PADCTL_IOPHY_PLL_P0_CTL2_TXCLKREF_EN |
 190                  XUSB_PADCTL_IOPHY_PLL_P0_CTL2_TXCLKREF_SEL;
 191         padctl_writel(padctl, value, XUSB_PADCTL_IOPHY_PLL_P0_CTL2);
 192
 193         value = padctl_readl(padctl, XUSB_PADCTL_IOPHY_PLL_P0_CTL1);
 194         value |= XUSB_PADCTL_IOPHY_PLL_P0_CTL1_PLL_RST;
 195         padctl_writel(padctl, value, XUSB_PADCTL_IOPHY_PLL_P0_CTL1);
 196
 197         start = get_timer(0);
 198
 199         while (get_timer(start) < 50) {
 200                 value = padctl_readl(padctl, XUSB_PADCTL_IOPHY_PLL_P0_CTL1);
 201                 if (value & XUSB_PADCTL_IOPHY_PLL_P0_CTL1_PLL0_LOCKDET) {
 202                         err = 0;
 203                         break;
 204                 }
 205         }
 206
 207         return err;
 208 }
 209
 210 static int pcie_phy_disable(struct tegra_xusb_phy *phy)
 211 {
 212         struct tegra_xusb_padctl *padctl = phy->padctl;
 213         u32 value;
 214
 215         value = padctl_readl(padctl, XUSB_PADCTL_IOPHY_PLL_P0_CTL1);
 216         value &= ~XUSB_PADCTL_IOPHY_PLL_P0_CTL1_PLL_RST;
 217         padctl_writel(padctl, value, XUSB_PADCTL_IOPHY_PLL_P0_CTL1);
 218
 219         return 0;
 220 }
 221
 222 static int sata_phy_enable(struct tegra_xusb_phy *phy)
 223 {
 224         struct tegra_xusb_padctl *padctl = phy->padctl;
 225         int err = -ETIMEDOUT;
 226         unsigned long start;
 227         u32 value;
 228
 229         value = padctl_readl(padctl, XUSB_PADCTL_IOPHY_MISC_PAD_S0_CTL1);
 230         value &= ~XUSB_PADCTL_IOPHY_MISC_PAD_S0_CTL1_IDDQ_OVRD;
 231         value &= ~XUSB_PADCTL_IOPHY_MISC_PAD_S0_CTL1_IDDQ;
 232         padctl_writel(padctl, value, XUSB_PADCTL_IOPHY_MISC_PAD_S0_CTL1);
 233
 234         value = padctl_readl(padctl, XUSB_PADCTL_IOPHY_PLL_S0_CTL1);
 235         value &= ~XUSB_PADCTL_IOPHY_PLL_S0_CTL1_PLL_PWR_OVRD;
 236         value &= ~XUSB_PADCTL_IOPHY_PLL_S0_CTL1_PLL_IDDQ;
 237         padctl_writel(padctl, value, XUSB_PADCTL_IOPHY_PLL_S0_CTL1);
 238
 239         value = padctl_readl(padctl, XUSB_PADCTL_IOPHY_PLL_S0_CTL1);
 240         value |= XUSB_PADCTL_IOPHY_PLL_S0_CTL1_PLL1_MODE;
 241         padctl_writel(padctl, value, XUSB_PADCTL_IOPHY_PLL_S0_CTL1);
 242
 243         value = padctl_readl(padctl, XUSB_PADCTL_IOPHY_PLL_S0_CTL1);
 244         value |= XUSB_PADCTL_IOPHY_PLL_S0_CTL1_PLL_RST;
 245         padctl_writel(padctl, value, XUSB_PADCTL_IOPHY_PLL_S0_CTL1);
 246
 247         start = get_timer(0);
 248
 249         while (get_timer(start) < 50) {
 250                 value = padctl_readl(padctl, XUSB_PADCTL_IOPHY_PLL_S0_CTL1);
 251                 if (value & XUSB_PADCTL_IOPHY_PLL_S0_CTL1_PLL1_LOCKDET) {
 252                         err = 0;
 253                         break;
 254                 }
 255         }
 256
 257         return err;
 258 }
 259
 260 static int sata_phy_disable(struct tegra_xusb_phy *phy)
 261 {
 262         struct tegra_xusb_padctl *padctl = phy->padctl;
 263         u32 value;
 264
 265         value = padctl_readl(padctl, XUSB_PADCTL_IOPHY_PLL_S0_CTL1);
 266         value &= ~XUSB_PADCTL_IOPHY_PLL_S0_CTL1_PLL_RST;
 267         padctl_writel(padctl, value, XUSB_PADCTL_IOPHY_PLL_S0_CTL1);
 268
 269         value = padctl_readl(padctl, XUSB_PADCTL_IOPHY_PLL_S0_CTL1);
 270         value &= ~XUSB_PADCTL_IOPHY_PLL_S0_CTL1_PLL1_MODE;
 271         padctl_writel(padctl, value, XUSB_PADCTL_IOPHY_PLL_S0_CTL1);
 272
 273         value = padctl_readl(padctl, XUSB_PADCTL_IOPHY_PLL_S0_CTL1);
 274         value |= XUSB_PADCTL_IOPHY_PLL_S0_CTL1_PLL_PWR_OVRD;
 275         value |= XUSB_PADCTL_IOPHY_PLL_S0_CTL1_PLL_IDDQ;
 276         padctl_writel(padctl, value, XUSB_PADCTL_IOPHY_PLL_S0_CTL1);
 277
 278         value = padctl_readl(padctl, XUSB_PADCTL_IOPHY_MISC_PAD_S0_CTL1);
 279         value |= ~XUSB_PADCTL_IOPHY_MISC_PAD_S0_CTL1_IDDQ_OVRD;
 280         value |= ~XUSB_PADCTL_IOPHY_MISC_PAD_S0_CTL1_IDDQ;
 281         padctl_writel(padctl, value, XUSB_PADCTL_IOPHY_MISC_PAD_S0_CTL1);
 282
 283         return 0;
 284 }
 285
 286 static const struct tegra_xusb_phy_ops pcie_phy_ops = {
 287         .prepare = phy_prepare,
 288         .enable = pcie_phy_enable,
 289         .disable = pcie_phy_disable,
 290         .unprepare = phy_unprepare,
 291 };
 292
 293 static const struct tegra_xusb_phy_ops sata_phy_ops = {
 294         .prepare = phy_prepare,
 295         .enable = sata_phy_enable,
 296         .disable = sata_phy_disable,
 297         .unprepare = phy_unprepare,
 298 };
 299
 300 static struct tegra_xusb_phy tegra124_phys[] = {
 301         {
 302                 .type = TEGRA_XUSB_PADCTL_PCIE,
 303                 .ops = &pcie_phy_ops,
 304                 .padctl = &padctl,
 305         },
 306         {
 307                 .type = TEGRA_XUSB_PADCTL_SATA,
 308                 .ops = &sata_phy_ops,
 309                 .padctl = &padctl,
 310         },
 311 };
 312
 313 static const struct tegra_xusb_padctl_soc tegra124_socdata = {
 314         .lanes = tegra124_lanes,
 315         .num_lanes = ARRAY_SIZE(tegra124_lanes),
 316         .functions = tegra124_functions,
 317         .num_functions = ARRAY_SIZE(tegra124_functions),
 318         .phys = tegra124_phys,
 319         .num_phys = ARRAY_SIZE(tegra124_phys),
 320 };
 321
 322 void tegra_xusb_padctl_init(void)
 323 {
 324         ofnode nodes[1];
 325         int count = 0;
 326         int ret;
 327
 328         debug("%s: start\n", __func__);
 329         if (of_live_active()) {
 330                 struct device_node *np = of_find_compatible_node(NULL, NULL,
 331                                                 "nvidia,tegra124-xusb-padctl");
 332
 333                 debug("np=%p\n", np);
 334                 if (np) {
 335                         nodes[0] = np_to_ofnode(np);
 336                         count = 1;
 337                 }
 338         } else {
 339                 int node_offsets[1];
 340                 int i;
 341
 342                 count = fdtdec_find_aliases_for_id(gd->fdt_blob, "padctl",
 343                                 COMPAT_NVIDIA_TEGRA124_XUSB_PADCTL,
 344                                 node_offsets, ARRAY_SIZE(node_offsets));
 345                 for (i = 0; i < count; i++)
 346                         nodes[i] = offset_to_ofnode(node_offsets[i]);
 347         }
 348
 349         ret = tegra_xusb_process_nodes(nodes, count, &tegra124_socdata);
 350         debug("%s: done, ret=%d\n", __func__, ret);
 351 }