linux/drivers/phy/amlogic/phy-meson-axg-mipi-dphy.c
<<
>>
Prefs
   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * Meson AXG MIPI DPHY driver
   4 *
   5 * Copyright (C) 2018 Amlogic, Inc. All rights reserved
   6 * Copyright (C) 2020 BayLibre, SAS
   7 * Author: Neil Armstrong <narmstrong@baylibre.com>
   8 */
   9
  10#include <linux/bitfield.h>
  11#include <linux/bitops.h>
  12#include <linux/clk.h>
  13#include <linux/delay.h>
  14#include <linux/io.h>
  15#include <linux/module.h>
  16#include <linux/of_device.h>
  17#include <linux/regmap.h>
  18#include <linux/reset.h>
  19#include <linux/phy/phy.h>
  20#include <linux/platform_device.h>
  21
  22/* [31] soft reset for the phy.
  23 *              1: reset. 0: dessert the reset.
  24 * [30] clock lane soft reset.
  25 * [29] data byte lane 3 soft reset.
  26 * [28] data byte lane 2 soft reset.
  27 * [27] data byte lane 1 soft reset.
  28 * [26] data byte lane 0 soft reset.
  29 * [25] mipi dsi pll clock selection.
  30 *              1:  clock from fixed 850Mhz clock source. 0: from VID2 PLL.
  31 * [12] mipi HSbyteclk enable.
  32 * [11] mipi divider clk selection.
  33 *              1: select the mipi DDRCLKHS from clock divider.
  34 *              0: from PLL clock.
  35 * [10] mipi clock divider control.
  36 *              1: /4. 0: /2.
  37 * [9]  mipi divider output enable.
  38 * [8]  mipi divider counter enable.
  39 * [7]  PLL clock enable.
  40 * [5]  LPDT data endian.
  41 *              1 = transfer the high bit first. 0 : transfer the low bit first.
  42 * [4]  HS data endian.
  43 * [3]  force data byte lane in stop mode.
  44 * [2]  force data byte lane 0 in receiver mode.
  45 * [1]  write 1 to sync the txclkesc input. the internal logic have to
  46 *      use txclkesc to decide Txvalid and Txready.
  47 * [0]  enalbe the MIPI DPHY TxDDRClk.
  48 */
  49#define MIPI_DSI_PHY_CTRL                               0x0
  50
  51/* [31] clk lane tx_hs_en control selection.
  52 *              1: from register. 0: use clk lane state machine.
  53 * [30] register bit for clock lane tx_hs_en.
  54 * [29] clk lane tx_lp_en contrl selection.
  55 *              1: from register. 0: from clk lane state machine.
  56 * [28] register bit for clock lane tx_lp_en.
  57 * [27] chan0 tx_hs_en control selection.
  58 *              1: from register. 0: from chan0 state machine.
  59 * [26] register bit for chan0 tx_hs_en.
  60 * [25] chan0 tx_lp_en control selection.
  61 *              1: from register. 0: from chan0 state machine.
  62 * [24] register bit from chan0 tx_lp_en.
  63 * [23] chan0 rx_lp_en control selection.
  64 *              1: from register. 0: from chan0 state machine.
  65 * [22] register bit from chan0 rx_lp_en.
  66 * [21] chan0 contention detection enable control selection.
  67 *              1: from register. 0: from chan0 state machine.
  68 * [20] register bit from chan0 contention dectection enable.
  69 * [19] chan1 tx_hs_en control selection.
  70 *              1: from register. 0: from chan0 state machine.
  71 * [18] register bit for chan1 tx_hs_en.
  72 * [17] chan1 tx_lp_en control selection.
  73 *              1: from register. 0: from chan0 state machine.
  74 * [16] register bit from chan1 tx_lp_en.
  75 * [15] chan2 tx_hs_en control selection.
  76 *              1: from register. 0: from chan0 state machine.
  77 * [14] register bit for chan2 tx_hs_en.
  78 * [13] chan2 tx_lp_en control selection.
  79 *              1: from register. 0: from chan0 state machine.
  80 * [12] register bit from chan2 tx_lp_en.
  81 * [11] chan3 tx_hs_en control selection.
  82 *              1: from register. 0: from chan0 state machine.
  83 * [10] register bit for chan3 tx_hs_en.
  84 * [9]  chan3 tx_lp_en control selection.
  85 *              1: from register. 0: from chan0 state machine.
  86 * [8]  register bit from chan3 tx_lp_en.
  87 * [4]  clk chan power down. this bit is also used as the power down
  88 *      of the whole MIPI_DSI_PHY.
  89 * [3]  chan3 power down.
  90 * [2]  chan2 power down.
  91 * [1]  chan1 power down.
  92 * [0]  chan0 power down.
  93 */
  94#define MIPI_DSI_CHAN_CTRL                              0x4
  95
  96/* [24]   rx turn watch dog triggered.
  97 * [23]   rx esc watchdog  triggered.
  98 * [22]   mbias ready.
  99 * [21]   txclkesc  synced and ready.
 100 * [20:17] clk lane state. {mbias_ready, tx_stop, tx_ulps, tx_hs_active}
 101 * [16:13] chan3 state{0, tx_stop, tx_ulps, tx_hs_active}
 102 * [12:9]  chan2 state.{0, tx_stop, tx_ulps, tx_hs_active}
 103 * [8:5]   chan1 state. {0, tx_stop, tx_ulps, tx_hs_active}
 104 * [4:0]   chan0 state. {TX_STOP, tx_ULPS, hs_active, direction, rxulpsesc}
 105 */
 106#define MIPI_DSI_CHAN_STS                               0x8
 107
 108/* [31:24] TCLK_PREPARE.
 109 * [23:16] TCLK_ZERO.
 110 * [15:8]  TCLK_POST.
 111 * [7:0]   TCLK_TRAIL.
 112 */
 113#define MIPI_DSI_CLK_TIM                                0xc
 114
 115/* [31:24] THS_PREPARE.
 116 * [23:16] THS_ZERO.
 117 * [15:8]  THS_TRAIL.
 118 * [7:0]   THS_EXIT.
 119 */
 120#define MIPI_DSI_HS_TIM                                 0x10
 121
 122/* [31:24] tTA_GET.
 123 * [23:16] tTA_GO.
 124 * [15:8]  tTA_SURE.
 125 * [7:0]   tLPX.
 126 */
 127#define MIPI_DSI_LP_TIM                                 0x14
 128
 129/* wait time to  MIPI DIS analog ready. */
 130#define MIPI_DSI_ANA_UP_TIM                             0x18
 131
 132/* TINIT. */
 133#define MIPI_DSI_INIT_TIM                               0x1c
 134
 135/* TWAKEUP. */
 136#define MIPI_DSI_WAKEUP_TIM                             0x20
 137
 138/* when in RxULPS check state, after the the logic enable the analog,
 139 *      how long we should wait to check the lP state .
 140 */
 141#define MIPI_DSI_LPOK_TIM                               0x24
 142
 143/* Watchdog for RX low power state no finished. */
 144#define MIPI_DSI_LP_WCHDOG                              0x28
 145
 146/* tMBIAS,  after send power up signals to analog,
 147 *      how long we should wait for analog powered up.
 148 */
 149#define MIPI_DSI_ANA_CTRL                               0x2c
 150
 151/* [31:8]  reserved for future.
 152 * [7:0]   tCLK_PRE.
 153 */
 154#define MIPI_DSI_CLK_TIM1                               0x30
 155
 156/* watchdog for turn around waiting time. */
 157#define MIPI_DSI_TURN_WCHDOG                            0x34
 158
 159/* When in RxULPS state, how frequency we should to check
 160 *      if the TX side out of ULPS state.
 161 */
 162#define MIPI_DSI_ULPS_CHECK                             0x38
 163#define MIPI_DSI_TEST_CTRL0                             0x3c
 164#define MIPI_DSI_TEST_CTRL1                             0x40
 165
 166struct phy_meson_axg_mipi_dphy_priv {
 167        struct device                           *dev;
 168        struct regmap                           *regmap;
 169        struct clk                              *clk;
 170        struct reset_control                    *reset;
 171        struct phy                              *analog;
 172        struct phy_configure_opts_mipi_dphy     config;
 173};
 174
 175static const struct regmap_config phy_meson_axg_mipi_dphy_regmap_conf = {
 176        .reg_bits = 8,
 177        .val_bits = 32,
 178        .reg_stride = 4,
 179        .max_register = MIPI_DSI_TEST_CTRL1,
 180};
 181
 182static int phy_meson_axg_mipi_dphy_init(struct phy *phy)
 183{
 184        struct phy_meson_axg_mipi_dphy_priv *priv = phy_get_drvdata(phy);
 185        int ret;
 186
 187        ret = phy_init(priv->analog);
 188        if (ret)
 189                return ret;
 190
 191        ret = reset_control_reset(priv->reset);
 192        if (ret)
 193                return ret;
 194
 195        return 0;
 196}
 197
 198static int phy_meson_axg_mipi_dphy_configure(struct phy *phy,
 199                                              union phy_configure_opts *opts)
 200{
 201        struct phy_meson_axg_mipi_dphy_priv *priv = phy_get_drvdata(phy);
 202        int ret;
 203
 204        ret = phy_mipi_dphy_config_validate(&opts->mipi_dphy);
 205        if (ret)
 206                return ret;
 207
 208        ret = phy_configure(priv->analog, opts);
 209        if (ret)
 210                return ret;
 211
 212        memcpy(&priv->config, opts, sizeof(priv->config));
 213
 214        return 0;
 215}
 216
 217static int phy_meson_axg_mipi_dphy_power_on(struct phy *phy)
 218{
 219        struct phy_meson_axg_mipi_dphy_priv *priv = phy_get_drvdata(phy);
 220        int ret;
 221        unsigned long temp;
 222
 223        ret = phy_power_on(priv->analog);
 224        if (ret)
 225                return ret;
 226
 227        /* enable phy clock */
 228        regmap_write(priv->regmap, MIPI_DSI_PHY_CTRL,  0x1);
 229        regmap_write(priv->regmap, MIPI_DSI_PHY_CTRL,
 230                     BIT(0) | /* enable the DSI PLL clock . */
 231                     BIT(7) | /* enable pll clock which connected to DDR clock path */
 232                     BIT(8)); /* enable the clock divider counter */
 233
 234        /* enable the divider clock out */
 235        regmap_update_bits(priv->regmap, MIPI_DSI_PHY_CTRL, BIT(9), BIT(9));
 236
 237        /* enable the byte clock generation. */
 238        regmap_update_bits(priv->regmap, MIPI_DSI_PHY_CTRL, BIT(12), BIT(12));
 239        regmap_update_bits(priv->regmap, MIPI_DSI_PHY_CTRL, BIT(31), BIT(31));
 240        regmap_update_bits(priv->regmap, MIPI_DSI_PHY_CTRL, BIT(31), 0);
 241
 242        /* Calculate lanebyteclk period in ps */
 243        temp = (1000000 * 100) / (priv->config.hs_clk_rate / 1000);
 244        temp = temp * 8 * 10;
 245
 246        regmap_write(priv->regmap, MIPI_DSI_CLK_TIM,
 247                     DIV_ROUND_UP(priv->config.clk_trail, temp) |
 248                     (DIV_ROUND_UP(priv->config.clk_post +
 249                                   priv->config.hs_trail, temp) << 8) |
 250                     (DIV_ROUND_UP(priv->config.clk_zero, temp) << 16) |
 251                     (DIV_ROUND_UP(priv->config.clk_prepare, temp) << 24));
 252        regmap_write(priv->regmap, MIPI_DSI_CLK_TIM1,
 253                     DIV_ROUND_UP(priv->config.clk_pre, temp));
 254
 255        regmap_write(priv->regmap, MIPI_DSI_HS_TIM,
 256                     DIV_ROUND_UP(priv->config.hs_exit, temp) |
 257                     (DIV_ROUND_UP(priv->config.hs_trail, temp) << 8) |
 258                     (DIV_ROUND_UP(priv->config.hs_zero, temp) << 16) |
 259                     (DIV_ROUND_UP(priv->config.hs_prepare, temp) << 24));
 260
 261        regmap_write(priv->regmap, MIPI_DSI_LP_TIM,
 262                     DIV_ROUND_UP(priv->config.lpx, temp) |
 263                     (DIV_ROUND_UP(priv->config.ta_sure, temp) << 8) |
 264                     (DIV_ROUND_UP(priv->config.ta_go, temp) << 16) |
 265                     (DIV_ROUND_UP(priv->config.ta_get, temp) << 24));
 266
 267        regmap_write(priv->regmap, MIPI_DSI_ANA_UP_TIM, 0x0100);
 268        regmap_write(priv->regmap, MIPI_DSI_INIT_TIM,
 269                     DIV_ROUND_UP(priv->config.init * NSEC_PER_MSEC, temp));
 270        regmap_write(priv->regmap, MIPI_DSI_WAKEUP_TIM,
 271                     DIV_ROUND_UP(priv->config.wakeup * NSEC_PER_MSEC, temp));
 272        regmap_write(priv->regmap, MIPI_DSI_LPOK_TIM, 0x7C);
 273        regmap_write(priv->regmap, MIPI_DSI_ULPS_CHECK, 0x927C);
 274        regmap_write(priv->regmap, MIPI_DSI_LP_WCHDOG, 0x1000);
 275        regmap_write(priv->regmap, MIPI_DSI_TURN_WCHDOG, 0x1000);
 276
 277        /* Powerup the analog circuit */
 278        switch (priv->config.lanes) {
 279        case 1:
 280                regmap_write(priv->regmap, MIPI_DSI_CHAN_CTRL, 0xe);
 281                break;
 282        case 2:
 283                regmap_write(priv->regmap, MIPI_DSI_CHAN_CTRL, 0xc);
 284                break;
 285        case 3:
 286                regmap_write(priv->regmap, MIPI_DSI_CHAN_CTRL, 0x8);
 287                break;
 288        case 4:
 289        default:
 290                regmap_write(priv->regmap, MIPI_DSI_CHAN_CTRL, 0);
 291                break;
 292        }
 293
 294        /* Trigger a sync active for esc_clk */
 295        regmap_update_bits(priv->regmap, MIPI_DSI_PHY_CTRL, BIT(1), BIT(1));
 296
 297        return 0;
 298}
 299
 300static int phy_meson_axg_mipi_dphy_power_off(struct phy *phy)
 301{
 302        struct phy_meson_axg_mipi_dphy_priv *priv = phy_get_drvdata(phy);
 303
 304        regmap_write(priv->regmap, MIPI_DSI_CHAN_CTRL, 0xf);
 305        regmap_write(priv->regmap, MIPI_DSI_PHY_CTRL, BIT(31));
 306
 307        phy_power_off(priv->analog);
 308
 309        return 0;
 310}
 311
 312static int phy_meson_axg_mipi_dphy_exit(struct phy *phy)
 313{
 314        struct phy_meson_axg_mipi_dphy_priv *priv = phy_get_drvdata(phy);
 315        int ret;
 316
 317        ret = phy_exit(priv->analog);
 318        if (ret)
 319                return ret;
 320
 321        return reset_control_reset(priv->reset);
 322}
 323
 324static const struct phy_ops phy_meson_axg_mipi_dphy_ops = {
 325        .configure      = phy_meson_axg_mipi_dphy_configure,
 326        .init           = phy_meson_axg_mipi_dphy_init,
 327        .exit           = phy_meson_axg_mipi_dphy_exit,
 328        .power_on       = phy_meson_axg_mipi_dphy_power_on,
 329        .power_off      = phy_meson_axg_mipi_dphy_power_off,
 330        .owner          = THIS_MODULE,
 331};
 332
 333static int phy_meson_axg_mipi_dphy_probe(struct platform_device *pdev)
 334{
 335        struct device *dev = &pdev->dev;
 336        struct phy_provider *phy_provider;
 337        struct resource *res;
 338        struct phy_meson_axg_mipi_dphy_priv *priv;
 339        struct phy *phy;
 340        void __iomem *base;
 341        int ret;
 342
 343        priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
 344        if (!priv)
 345                return -ENOMEM;
 346
 347        priv->dev = dev;
 348        platform_set_drvdata(pdev, priv);
 349
 350        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 351        base = devm_ioremap_resource(dev, res);
 352        if (IS_ERR(base))
 353                return PTR_ERR(base);
 354
 355        priv->regmap = devm_regmap_init_mmio(dev, base,
 356                                        &phy_meson_axg_mipi_dphy_regmap_conf);
 357        if (IS_ERR(priv->regmap))
 358                return PTR_ERR(priv->regmap);
 359
 360        priv->clk = devm_clk_get(dev, "pclk");
 361        if (IS_ERR(priv->clk))
 362                return PTR_ERR(priv->clk);
 363
 364        priv->reset = devm_reset_control_get(dev, "phy");
 365        if (IS_ERR(priv->reset))
 366                return PTR_ERR(priv->reset);
 367
 368        priv->analog = devm_phy_get(dev, "analog");
 369        if (IS_ERR(priv->analog))
 370                return PTR_ERR(priv->analog);
 371
 372        ret = clk_prepare_enable(priv->clk);
 373        if (ret)
 374                return ret;
 375
 376        ret = reset_control_deassert(priv->reset);
 377        if (ret)
 378                return ret;
 379
 380        phy = devm_phy_create(dev, NULL, &phy_meson_axg_mipi_dphy_ops);
 381        if (IS_ERR(phy)) {
 382                ret = PTR_ERR(phy);
 383                if (ret != -EPROBE_DEFER)
 384                        dev_err(dev, "failed to create PHY\n");
 385
 386                return ret;
 387        }
 388
 389        phy_set_drvdata(phy, priv);
 390
 391        phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
 392
 393        return PTR_ERR_OR_ZERO(phy_provider);
 394}
 395
 396static const struct of_device_id phy_meson_axg_mipi_dphy_of_match[] = {
 397        { .compatible = "amlogic,axg-mipi-dphy", },
 398        { },
 399};
 400MODULE_DEVICE_TABLE(of, phy_meson_axg_mipi_dphy_of_match);
 401
 402static struct platform_driver phy_meson_axg_mipi_dphy_driver = {
 403        .probe  = phy_meson_axg_mipi_dphy_probe,
 404        .driver = {
 405                .name           = "phy-meson-axg-mipi-dphy",
 406                .of_match_table = phy_meson_axg_mipi_dphy_of_match,
 407        },
 408};
 409module_platform_driver(phy_meson_axg_mipi_dphy_driver);
 410
 411MODULE_AUTHOR("Neil Armstrong <narmstrong@baylibre.com>");
 412MODULE_DESCRIPTION("Meson AXG MIPI DPHY driver");
 413MODULE_LICENSE("GPL v2");
 414
lxr.linux.no kindly hosted by Redpill Linpro AS, provider of Linux consulting and operations services since 1995.