arch/arm/mach-omap2/display.c

   1 /*
   2  * OMAP2plus display device setup / initialization.
   3  *
   4  * Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com/
   5  *      Senthilvadivu Guruswamy
   6  *      Sumit Semwal
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  *
  12  * This program is distributed "as is" WITHOUT ANY WARRANTY of any
  13  * kind, whether express or implied; without even the implied warranty
  14  * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  */
  17
  18 #include <linux/string.h>
  19 #include <linux/kernel.h>
  20 #include <linux/init.h>
  21 #include <linux/platform_device.h>
  22 #include <linux/io.h>
  23 #include <linux/clk.h>
  24 #include <linux/err.h>
  25
  26 #include <video/omapdss.h>
  27 #include <plat/omap_hwmod.h>
  28 #include <plat/omap_device.h>
  29 #include <plat/omap-pm.h>
  30 #include <plat/common.h>
  31
  32 #include "control.h"
  33 #include "display.h"
  34
  35 #define DISPC_CONTROL           0x0040
  36 #define DISPC_CONTROL2          0x0238
  37 #define DISPC_IRQSTATUS         0x0018
  38
  39 #define DSS_SYSCONFIG           0x10
  40 #define DSS_SYSSTATUS           0x14
  41 #define DSS_CONTROL             0x40
  42 #define DSS_SDI_CONTROL         0x44
  43 #define DSS_PLL_CONTROL         0x48
  44
  45 #define LCD_EN_MASK             (0x1 << 0)
  46 #define DIGIT_EN_MASK           (0x1 << 1)
  47
  48 #define FRAMEDONE_IRQ_SHIFT     0
  49 #define EVSYNC_EVEN_IRQ_SHIFT   2
  50 #define EVSYNC_ODD_IRQ_SHIFT    3
  51 #define FRAMEDONE2_IRQ_SHIFT    22
  52 #define FRAMEDONETV_IRQ_SHIFT   24
  53
  54 /*
  55  * FRAMEDONE_IRQ_TIMEOUT: how long (in milliseconds) to wait during DISPC
  56  *     reset before deciding that something has gone wrong
  57  */
  58 #define FRAMEDONE_IRQ_TIMEOUT           100
  59
  60 static struct platform_device omap_display_device = {
  61         .name          = "omapdss",
  62         .id            = -1,
  63         .dev            = {
  64                 .platform_data = NULL,
  65         },
  66 };
  67
  68 struct omap_dss_hwmod_data {
  69         const char *oh_name;
  70         const char *dev_name;
  71         const int id;
  72 };
  73
  74 static const struct omap_dss_hwmod_data omap2_dss_hwmod_data[] __initdata = {
  75         { "dss_core", "omapdss_dss", -1 },
  76         { "dss_dispc", "omapdss_dispc", -1 },
  77         { "dss_rfbi", "omapdss_rfbi", -1 },
  78         { "dss_venc", "omapdss_venc", -1 },
  79 };
  80
  81 static const struct omap_dss_hwmod_data omap3_dss_hwmod_data[] __initdata = {
  82         { "dss_core", "omapdss_dss", -1 },
  83         { "dss_dispc", "omapdss_dispc", -1 },
  84         { "dss_rfbi", "omapdss_rfbi", -1 },
  85         { "dss_venc", "omapdss_venc", -1 },
  86         { "dss_dsi1", "omapdss_dsi", 0 },
  87 };
  88
  89 static const struct omap_dss_hwmod_data omap4_dss_hwmod_data[] __initdata = {
  90         { "dss_core", "omapdss_dss", -1 },
  91         { "dss_dispc", "omapdss_dispc", -1 },
  92         { "dss_rfbi", "omapdss_rfbi", -1 },
  93         { "dss_venc", "omapdss_venc", -1 },
  94         { "dss_dsi1", "omapdss_dsi", 0 },
  95         { "dss_dsi2", "omapdss_dsi", 1 },
  96         { "dss_hdmi", "omapdss_hdmi", -1 },
  97 };
  98
  99 static int omap4_dsi_mux_pads(int dsi_id, unsigned lanes)
 100 {
 101         u32 enable_mask, enable_shift;
 102         u32 pipd_mask, pipd_shift;
 103         u32 reg;
 104
 105         if (dsi_id == 0) {
 106                 enable_mask = OMAP4_DSI1_LANEENABLE_MASK;
 107                 enable_shift = OMAP4_DSI1_LANEENABLE_SHIFT;
 108                 pipd_mask = OMAP4_DSI1_PIPD_MASK;
 109                 pipd_shift = OMAP4_DSI1_PIPD_SHIFT;
 110         } else if (dsi_id == 1) {
 111                 enable_mask = OMAP4_DSI2_LANEENABLE_MASK;
 112                 enable_shift = OMAP4_DSI2_LANEENABLE_SHIFT;
 113                 pipd_mask = OMAP4_DSI2_PIPD_MASK;
 114                 pipd_shift = OMAP4_DSI2_PIPD_SHIFT;
 115         } else {
 116                 return -ENODEV;
 117         }
 118
 119         reg = omap4_ctrl_pad_readl(OMAP4_CTRL_MODULE_PAD_CORE_CONTROL_DSIPHY);
 120
 121         reg &= ~enable_mask;
 122         reg &= ~pipd_mask;
 123
 124         reg |= (lanes << enable_shift) & enable_mask;
 125         reg |= (lanes << pipd_shift) & pipd_mask;
 126
 127         omap4_ctrl_pad_writel(reg, OMAP4_CTRL_MODULE_PAD_CORE_CONTROL_DSIPHY);
 128
 129         return 0;
 130 }
 131
 132 static int omap_dsi_enable_pads(int dsi_id, unsigned lane_mask)
 133 {
 134         if (cpu_is_omap44xx())
 135                 return omap4_dsi_mux_pads(dsi_id, lane_mask);
 136
 137         return 0;
 138 }
 139
 140 static void omap_dsi_disable_pads(int dsi_id, unsigned lane_mask)
 141 {
 142         if (cpu_is_omap44xx())
 143                 omap4_dsi_mux_pads(dsi_id, 0);
 144 }
 145
 146 int __init omap_display_init(struct omap_dss_board_info *board_data)
 147 {
 148         int r = 0;
 149         struct omap_hwmod *oh;
 150         struct platform_device *pdev;
 151         int i, oh_count;
 152         struct omap_display_platform_data pdata;
 153         const struct omap_dss_hwmod_data *curr_dss_hwmod;
 154
 155         memset(&pdata, 0, sizeof(pdata));
 156
 157         if (cpu_is_omap24xx()) {
 158                 curr_dss_hwmod = omap2_dss_hwmod_data;
 159                 oh_count = ARRAY_SIZE(omap2_dss_hwmod_data);
 160         } else if (cpu_is_omap34xx()) {
 161                 curr_dss_hwmod = omap3_dss_hwmod_data;
 162                 oh_count = ARRAY_SIZE(omap3_dss_hwmod_data);
 163         } else {
 164                 curr_dss_hwmod = omap4_dss_hwmod_data;
 165                 oh_count = ARRAY_SIZE(omap4_dss_hwmod_data);
 166         }
 167
 168         if (board_data->dsi_enable_pads == NULL)
 169                 board_data->dsi_enable_pads = omap_dsi_enable_pads;
 170         if (board_data->dsi_disable_pads == NULL)
 171                 board_data->dsi_disable_pads = omap_dsi_disable_pads;
 172
 173         pdata.board_data = board_data;
 174         pdata.board_data->get_context_loss_count =
 175                 omap_pm_get_dev_context_loss_count;
 176
 177         for (i = 0; i < oh_count; i++) {
 178                 oh = omap_hwmod_lookup(curr_dss_hwmod[i].oh_name);
 179                 if (!oh) {
 180                         pr_err("Could not look up %s\n",
 181                                 curr_dss_hwmod[i].oh_name);
 182                         return -ENODEV;
 183                 }
 184
 185                 pdev = omap_device_build(curr_dss_hwmod[i].dev_name,
 186                                 curr_dss_hwmod[i].id, oh, &pdata,
 187                                 sizeof(struct omap_display_platform_data),
 188                                 NULL, 0, 0);
 189
 190                 if (WARN((IS_ERR(pdev)), "Could not build omap_device for %s\n",
 191                                 curr_dss_hwmod[i].oh_name))
 192                         return -ENODEV;
 193         }
 194         omap_display_device.dev.platform_data = board_data;
 195
 196         r = platform_device_register(&omap_display_device);
 197         if (r < 0)
 198                 printk(KERN_ERR "Unable to register OMAP-Display device\n");
 199
 200         return r;
 201 }
 202
 203 static void dispc_disable_outputs(void)
 204 {
 205         u32 v, irq_mask = 0;
 206         bool lcd_en, digit_en, lcd2_en = false;
 207         int i;
 208         struct omap_dss_dispc_dev_attr *da;
 209         struct omap_hwmod *oh;
 210
 211         oh = omap_hwmod_lookup("dss_dispc");
 212         if (!oh) {
 213                 WARN(1, "display: could not disable outputs during reset - could not find dss_dispc hwmod\n");
 214                 return;
 215         }
 216
 217         if (!oh->dev_attr) {
 218                 pr_err("display: could not disable outputs during reset due to missing dev_attr\n");
 219                 return;
 220         }
 221
 222         da = (struct omap_dss_dispc_dev_attr *)oh->dev_attr;
 223
 224         /* store value of LCDENABLE and DIGITENABLE bits */
 225         v = omap_hwmod_read(oh, DISPC_CONTROL);
 226         lcd_en = v & LCD_EN_MASK;
 227         digit_en = v & DIGIT_EN_MASK;
 228
 229         /* store value of LCDENABLE for LCD2 */
 230         if (da->manager_count > 2) {
 231                 v = omap_hwmod_read(oh, DISPC_CONTROL2);
 232                 lcd2_en = v & LCD_EN_MASK;
 233         }
 234
 235         if (!(lcd_en | digit_en | lcd2_en))
 236                 return; /* no managers currently enabled */
 237
 238         /*
 239          * If any manager was enabled, we need to disable it before
 240          * DSS clocks are disabled or DISPC module is reset
 241          */
 242         if (lcd_en)
 243                 irq_mask |= 1 << FRAMEDONE_IRQ_SHIFT;
 244
 245         if (digit_en) {
 246                 if (da->has_framedonetv_irq) {
 247                         irq_mask |= 1 << FRAMEDONETV_IRQ_SHIFT;
 248                 } else {
 249                         irq_mask |= 1 << EVSYNC_EVEN_IRQ_SHIFT |
 250                                 1 << EVSYNC_ODD_IRQ_SHIFT;
 251                 }
 252         }
 253
 254         if (lcd2_en)
 255                 irq_mask |= 1 << FRAMEDONE2_IRQ_SHIFT;
 256
 257         /*
 258          * clear any previous FRAMEDONE, FRAMEDONETV,
 259          * EVSYNC_EVEN/ODD or FRAMEDONE2 interrupts
 260          */
 261         omap_hwmod_write(irq_mask, oh, DISPC_IRQSTATUS);
 262
 263         /* disable LCD and TV managers */
 264         v = omap_hwmod_read(oh, DISPC_CONTROL);
 265         v &= ~(LCD_EN_MASK | DIGIT_EN_MASK);
 266         omap_hwmod_write(v, oh, DISPC_CONTROL);
 267
 268         /* disable LCD2 manager */
 269         if (da->manager_count > 2) {
 270                 v = omap_hwmod_read(oh, DISPC_CONTROL2);
 271                 v &= ~LCD_EN_MASK;
 272                 omap_hwmod_write(v, oh, DISPC_CONTROL2);
 273         }
 274
 275         i = 0;
 276         while ((omap_hwmod_read(oh, DISPC_IRQSTATUS) & irq_mask) !=
 277                irq_mask) {
 278                 i++;
 279                 if (i > FRAMEDONE_IRQ_TIMEOUT) {
 280                         pr_err("didn't get FRAMEDONE1/2 or TV interrupt\n");
 281                         break;
 282                 }
 283                 mdelay(1);
 284         }
 285 }
 286
 287 #define MAX_MODULE_SOFTRESET_WAIT       10000
 288 int omap_dss_reset(struct omap_hwmod *oh)
 289 {
 290         struct omap_hwmod_opt_clk *oc;
 291         int c = 0;
 292         int i, r;
 293
 294         if (!(oh->class->sysc->sysc_flags & SYSS_HAS_RESET_STATUS)) {
 295                 pr_err("dss_core: hwmod data doesn't contain reset data\n");
 296                 return -EINVAL;
 297         }
 298
 299         for (i = oh->opt_clks_cnt, oc = oh->opt_clks; i > 0; i--, oc++)
 300                 if (oc->_clk)
 301                         clk_enable(oc->_clk);
 302
 303         dispc_disable_outputs();
 304
 305         /* clear SDI registers */
 306         if (cpu_is_omap3430()) {
 307                 omap_hwmod_write(0x0, oh, DSS_SDI_CONTROL);
 308                 omap_hwmod_write(0x0, oh, DSS_PLL_CONTROL);
 309         }
 310
 311         /*
 312          * clear DSS_CONTROL register to switch DSS clock sources to
 313          * PRCM clock, if any
 314          */
 315         omap_hwmod_write(0x0, oh, DSS_CONTROL);
 316
 317         omap_test_timeout((omap_hwmod_read(oh, oh->class->sysc->syss_offs)
 318                                 & SYSS_RESETDONE_MASK),
 319                         MAX_MODULE_SOFTRESET_WAIT, c);
 320
 321         if (c == MAX_MODULE_SOFTRESET_WAIT)
 322                 pr_warning("dss_core: waiting for reset to finish failed\n");
 323         else
 324                 pr_debug("dss_core: softreset done\n");
 325
 326         for (i = oh->opt_clks_cnt, oc = oh->opt_clks; i > 0; i--, oc++)
 327                 if (oc->_clk)
 328                         clk_disable(oc->_clk);
 329
 330         r = (c == MAX_MODULE_SOFTRESET_WAIT) ? -ETIMEDOUT : 0;
 331
 332         return r;
 333 }