kernel/drivers/media/platform/omap3isp/ispcsiphy.c

   1 /*
   2  * ispcsiphy.c
   3  *
   4  * TI OMAP3 ISP - CSI PHY module
   5  *
   6  * Copyright (C) 2010 Nokia Corporation
   7  * Copyright (C) 2009 Texas Instruments, Inc.
   8  *
   9  * Contacts: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
  10  *           Sakari Ailus <sakari.ailus@iki.fi>
  11  *
  12  * This program is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License version 2 as
  14  * published by the Free Software Foundation.
  15  */
  16
  17 #include <linux/delay.h>
  18 #include <linux/device.h>
  19 #include <linux/regmap.h>
  20 #include <linux/regulator/consumer.h>
  21
  22 #include "isp.h"
  23 #include "ispreg.h"
  24 #include "ispcsiphy.h"
  25
  26 static void csiphy_routing_cfg_3630(struct isp_csiphy *phy,
  27                                     enum isp_interface_type iface,
  28                                     bool ccp2_strobe)
  29 {
  30         u32 reg;
  31         u32 shift, mode;
  32
  33         regmap_read(phy->isp->syscon, phy->isp->syscon_offset, &reg);
  34
  35         switch (iface) {
  36         default:
  37         /* Should not happen in practice, but let's keep the compiler happy. */
  38         case ISP_INTERFACE_CCP2B_PHY1:
  39                 reg &= ~OMAP3630_CONTROL_CAMERA_PHY_CTRL_CSI1_RX_SEL_PHY2;
  40                 shift = OMAP3630_CONTROL_CAMERA_PHY_CTRL_CAMMODE_PHY1_SHIFT;
  41                 break;
  42         case ISP_INTERFACE_CSI2C_PHY1:
  43                 shift = OMAP3630_CONTROL_CAMERA_PHY_CTRL_CAMMODE_PHY1_SHIFT;
  44                 mode = OMAP3630_CONTROL_CAMERA_PHY_CTRL_CAMMODE_DPHY;
  45                 break;
  46         case ISP_INTERFACE_CCP2B_PHY2:
  47                 reg |= OMAP3630_CONTROL_CAMERA_PHY_CTRL_CSI1_RX_SEL_PHY2;
  48                 shift = OMAP3630_CONTROL_CAMERA_PHY_CTRL_CAMMODE_PHY2_SHIFT;
  49                 break;
  50         case ISP_INTERFACE_CSI2A_PHY2:
  51                 shift = OMAP3630_CONTROL_CAMERA_PHY_CTRL_CAMMODE_PHY2_SHIFT;
  52                 mode = OMAP3630_CONTROL_CAMERA_PHY_CTRL_CAMMODE_DPHY;
  53                 break;
  54         }
  55
  56         /* Select data/clock or data/strobe mode for CCP2 */
  57         if (iface == ISP_INTERFACE_CCP2B_PHY1 ||
  58             iface == ISP_INTERFACE_CCP2B_PHY2) {
  59                 if (ccp2_strobe)
  60                         mode = OMAP3630_CONTROL_CAMERA_PHY_CTRL_CAMMODE_CCP2_DATA_STROBE;
  61                 else
  62                         mode = OMAP3630_CONTROL_CAMERA_PHY_CTRL_CAMMODE_CCP2_DATA_CLOCK;
  63         }
  64
  65         reg &= ~(OMAP3630_CONTROL_CAMERA_PHY_CTRL_CAMMODE_MASK << shift);
  66         reg |= mode << shift;
  67
  68         regmap_write(phy->isp->syscon, phy->isp->syscon_offset, reg);
  69 }
  70
  71 static void csiphy_routing_cfg_3430(struct isp_csiphy *phy, u32 iface, bool on,
  72                                     bool ccp2_strobe)
  73 {
  74         u32 csirxfe = OMAP343X_CONTROL_CSIRXFE_PWRDNZ
  75                 | OMAP343X_CONTROL_CSIRXFE_RESET;
  76
  77         /* Only the CCP2B on PHY1 is configurable. */
  78         if (iface != ISP_INTERFACE_CCP2B_PHY1)
  79                 return;
  80
  81         if (!on) {
  82                 regmap_write(phy->isp->syscon, phy->isp->syscon_offset, 0);
  83                 return;
  84         }
  85
  86         if (ccp2_strobe)
  87                 csirxfe |= OMAP343X_CONTROL_CSIRXFE_SELFORM;
  88
  89         regmap_write(phy->isp->syscon, phy->isp->syscon_offset, csirxfe);
  90 }
  91
  92 /*
  93  * Configure OMAP 3 CSI PHY routing.
  94  * @phy: relevant phy device
  95  * @iface: ISP_INTERFACE_*
  96  * @on: power on or off
  97  * @ccp2_strobe: false: data/clock, true: data/strobe
  98  *
  99  * Note that the underlying routing configuration registers are part of the
 100  * control (SCM) register space and part of the CORE power domain on both 3430
 101  * and 3630, so they will not hold their contents in off-mode. This isn't an
 102  * issue since the MPU power domain is forced on whilst the ISP is in use.
 103  */
 104 static void csiphy_routing_cfg(struct isp_csiphy *phy,
 105                                enum isp_interface_type iface, bool on,
 106                                bool ccp2_strobe)
 107 {
 108         if (phy->isp->phy_type == ISP_PHY_TYPE_3630 && on)
 109                 return csiphy_routing_cfg_3630(phy, iface, ccp2_strobe);
 110         if (phy->isp->phy_type == ISP_PHY_TYPE_3430)
 111                 return csiphy_routing_cfg_3430(phy, iface, on, ccp2_strobe);
 112 }
 113
 114 /*
 115  * csiphy_power_autoswitch_enable
 116  * @enable: Sets or clears the autoswitch function enable flag.
 117  */
 118 static void csiphy_power_autoswitch_enable(struct isp_csiphy *phy, bool enable)
 119 {
 120         isp_reg_clr_set(phy->isp, phy->cfg_regs, ISPCSI2_PHY_CFG,
 121                         ISPCSI2_PHY_CFG_PWR_AUTO,
 122                         enable ? ISPCSI2_PHY_CFG_PWR_AUTO : 0);
 123 }
 124
 125 /*
 126  * csiphy_set_power
 127  * @power: Power state to be set.
 128  *
 129  * Returns 0 if successful, or -EBUSY if the retry count is exceeded.
 130  */
 131 static int csiphy_set_power(struct isp_csiphy *phy, u32 power)
 132 {
 133         u32 reg;
 134         u8 retry_count;
 135
 136         isp_reg_clr_set(phy->isp, phy->cfg_regs, ISPCSI2_PHY_CFG,
 137                         ISPCSI2_PHY_CFG_PWR_CMD_MASK, power);
 138
 139         retry_count = 0;
 140         do {
 141                 udelay(50);
 142                 reg = isp_reg_readl(phy->isp, phy->cfg_regs, ISPCSI2_PHY_CFG) &
 143                                     ISPCSI2_PHY_CFG_PWR_STATUS_MASK;
 144
 145                 if (reg != power >> 2)
 146                         retry_count++;
 147
 148         } while ((reg != power >> 2) && (retry_count < 100));
 149
 150         if (retry_count == 100) {
 151                 dev_err(phy->isp->dev, "CSI2 CIO set power failed!\n");
 152                 return -EBUSY;
 153         }
 154
 155         return 0;
 156 }
 157
 158 /*
 159  * TCLK values are OK at their reset values
 160  */
 161 #define TCLK_TERM       0
 162 #define TCLK_MISS       1
 163 #define TCLK_SETTLE     14
 164
 165 static int omap3isp_csiphy_config(struct isp_csiphy *phy)
 166 {
 167         struct isp_csi2_device *csi2 = phy->csi2;
 168         struct isp_pipeline *pipe = to_isp_pipeline(&csi2->subdev.entity);
 169         struct isp_bus_cfg *buscfg = pipe->external->host_priv;
 170         struct isp_csiphy_lanes_cfg *lanes;
 171         int csi2_ddrclk_khz;
 172         unsigned int used_lanes = 0;
 173         unsigned int i;
 174         u32 reg;
 175
 176         if (!buscfg) {
 177                 struct isp_async_subdev *isd =
 178                         container_of(pipe->external->asd,
 179                                      struct isp_async_subdev, asd);
 180                 buscfg = &isd->bus;
 181         }
 182
 183         if (buscfg->interface == ISP_INTERFACE_CCP2B_PHY1
 184             || buscfg->interface == ISP_INTERFACE_CCP2B_PHY2)
 185                 lanes = &buscfg->bus.ccp2.lanecfg;
 186         else
 187                 lanes = &buscfg->bus.csi2.lanecfg;
 188
 189         /* Clock and data lanes verification */
 190         for (i = 0; i < phy->num_data_lanes; i++) {
 191                 if (lanes->data[i].pol > 1 || lanes->data[i].pos > 3)
 192                         return -EINVAL;
 193
 194                 if (used_lanes & (1 << lanes->data[i].pos))
 195                         return -EINVAL;
 196
 197                 used_lanes |= 1 << lanes->data[i].pos;
 198         }
 199
 200         if (lanes->clk.pol > 1 || lanes->clk.pos > 3)
 201                 return -EINVAL;
 202
 203         if (lanes->clk.pos == 0 || used_lanes & (1 << lanes->clk.pos))
 204                 return -EINVAL;
 205
 206         /*
 207          * The PHY configuration is lost in off mode, that's not an
 208          * issue since the MPU power domain is forced on whilst the
 209          * ISP is in use.
 210          */
 211         csiphy_routing_cfg(phy, buscfg->interface, true,
 212                            buscfg->bus.ccp2.phy_layer);
 213
 214         /* DPHY timing configuration */
 215         /* CSI-2 is DDR and we only count used lanes. */
 216         csi2_ddrclk_khz = pipe->external_rate / 1000
 217                 / (2 * hweight32(used_lanes)) * pipe->external_width;
 218
 219         reg = isp_reg_readl(csi2->isp, phy->phy_regs, ISPCSIPHY_REG0);
 220
 221         reg &= ~(ISPCSIPHY_REG0_THS_TERM_MASK |
 222                  ISPCSIPHY_REG0_THS_SETTLE_MASK);
 223         /* THS_TERM: Programmed value = ceil(12.5 ns/DDRClk period) - 1. */
 224         reg |= (DIV_ROUND_UP(25 * csi2_ddrclk_khz, 2000000) - 1)
 225                 << ISPCSIPHY_REG0_THS_TERM_SHIFT;
 226         /* THS_SETTLE: Programmed value = ceil(90 ns/DDRClk period) + 3. */
 227         reg |= (DIV_ROUND_UP(90 * csi2_ddrclk_khz, 1000000) + 3)
 228                 << ISPCSIPHY_REG0_THS_SETTLE_SHIFT;
 229
 230         isp_reg_writel(csi2->isp, reg, phy->phy_regs, ISPCSIPHY_REG0);
 231
 232         reg = isp_reg_readl(csi2->isp, phy->phy_regs, ISPCSIPHY_REG1);
 233
 234         reg &= ~(ISPCSIPHY_REG1_TCLK_TERM_MASK |
 235                  ISPCSIPHY_REG1_TCLK_MISS_MASK |
 236                  ISPCSIPHY_REG1_TCLK_SETTLE_MASK);
 237         reg |= TCLK_TERM << ISPCSIPHY_REG1_TCLK_TERM_SHIFT;
 238         reg |= TCLK_MISS << ISPCSIPHY_REG1_TCLK_MISS_SHIFT;
 239         reg |= TCLK_SETTLE << ISPCSIPHY_REG1_TCLK_SETTLE_SHIFT;
 240
 241         isp_reg_writel(csi2->isp, reg, phy->phy_regs, ISPCSIPHY_REG1);
 242
 243         /* DPHY lane configuration */
 244         reg = isp_reg_readl(csi2->isp, phy->cfg_regs, ISPCSI2_PHY_CFG);
 245
 246         for (i = 0; i < phy->num_data_lanes; i++) {
 247                 reg &= ~(ISPCSI2_PHY_CFG_DATA_POL_MASK(i + 1) |
 248                          ISPCSI2_PHY_CFG_DATA_POSITION_MASK(i + 1));
 249                 reg |= (lanes->data[i].pol <<
 250                         ISPCSI2_PHY_CFG_DATA_POL_SHIFT(i + 1));
 251                 reg |= (lanes->data[i].pos <<
 252                         ISPCSI2_PHY_CFG_DATA_POSITION_SHIFT(i + 1));
 253         }
 254
 255         reg &= ~(ISPCSI2_PHY_CFG_CLOCK_POL_MASK |
 256                  ISPCSI2_PHY_CFG_CLOCK_POSITION_MASK);
 257         reg |= lanes->clk.pol << ISPCSI2_PHY_CFG_CLOCK_POL_SHIFT;
 258         reg |= lanes->clk.pos << ISPCSI2_PHY_CFG_CLOCK_POSITION_SHIFT;
 259
 260         isp_reg_writel(csi2->isp, reg, phy->cfg_regs, ISPCSI2_PHY_CFG);
 261
 262         return 0;
 263 }
 264
 265 int omap3isp_csiphy_acquire(struct isp_csiphy *phy)
 266 {
 267         int rval;
 268
 269         if (phy->vdd == NULL) {
 270                 dev_err(phy->isp->dev, "Power regulator for CSI PHY not "
 271                         "available\n");
 272                 return -ENODEV;
 273         }
 274
 275         mutex_lock(&phy->mutex);
 276
 277         rval = regulator_enable(phy->vdd);
 278         if (rval < 0)
 279                 goto done;
 280
 281         rval = omap3isp_csi2_reset(phy->csi2);
 282         if (rval < 0)
 283                 goto done;
 284
 285         rval = omap3isp_csiphy_config(phy);
 286         if (rval < 0)
 287                 goto done;
 288
 289         rval = csiphy_set_power(phy, ISPCSI2_PHY_CFG_PWR_CMD_ON);
 290         if (rval) {
 291                 regulator_disable(phy->vdd);
 292                 goto done;
 293         }
 294
 295         csiphy_power_autoswitch_enable(phy, true);
 296         phy->phy_in_use = 1;
 297
 298 done:
 299         mutex_unlock(&phy->mutex);
 300         return rval;
 301 }
 302
 303 void omap3isp_csiphy_release(struct isp_csiphy *phy)
 304 {
 305         mutex_lock(&phy->mutex);
 306         if (phy->phy_in_use) {
 307                 struct isp_csi2_device *csi2 = phy->csi2;
 308                 struct isp_pipeline *pipe =
 309                         to_isp_pipeline(&csi2->subdev.entity);
 310                 struct isp_bus_cfg *buscfg = pipe->external->host_priv;
 311
 312                 csiphy_routing_cfg(phy, buscfg->interface, false,
 313                                    buscfg->bus.ccp2.phy_layer);
 314                 csiphy_power_autoswitch_enable(phy, false);
 315                 csiphy_set_power(phy, ISPCSI2_PHY_CFG_PWR_CMD_OFF);
 316                 regulator_disable(phy->vdd);
 317                 phy->phy_in_use = 0;
 318         }
 319         mutex_unlock(&phy->mutex);
 320 }
 321
 322 /*
 323  * omap3isp_csiphy_init - Initialize the CSI PHY frontends
 324  */
 325 int omap3isp_csiphy_init(struct isp_device *isp)
 326 {
 327         struct isp_csiphy *phy1 = &isp->isp_csiphy1;
 328         struct isp_csiphy *phy2 = &isp->isp_csiphy2;
 329
 330         phy2->isp = isp;
 331         phy2->csi2 = &isp->isp_csi2a;
 332         phy2->num_data_lanes = ISP_CSIPHY2_NUM_DATA_LANES;
 333         phy2->cfg_regs = OMAP3_ISP_IOMEM_CSI2A_REGS1;
 334         phy2->phy_regs = OMAP3_ISP_IOMEM_CSIPHY2;
 335         mutex_init(&phy2->mutex);
 336
 337         if (isp->revision == ISP_REVISION_15_0) {
 338                 phy1->isp = isp;
 339                 phy1->csi2 = &isp->isp_csi2c;
 340                 phy1->num_data_lanes = ISP_CSIPHY1_NUM_DATA_LANES;
 341                 phy1->cfg_regs = OMAP3_ISP_IOMEM_CSI2C_REGS1;
 342                 phy1->phy_regs = OMAP3_ISP_IOMEM_CSIPHY1;
 343                 mutex_init(&phy1->mutex);
 344         }
 345
 346         return 0;
 347 }