arch/arm/mach-pxa/am200epd.c

   1 /*
   2  * am200epd.c -- Platform device for AM200 EPD kit
   3  *
   4  * Copyright (C) 2008, Jaya Kumar
   5  *
   6  * This file is subject to the terms and conditions of the GNU General Public
   7  * License. See the file COPYING in the main directory of this archive for
   8  * more details.
   9  *
  10  * Layout is based on skeletonfb.c by James Simmons and Geert Uytterhoeven.
  11  *
  12  * This work was made possible by help and equipment support from E-Ink
  13  * Corporation. http://support.eink.com/community
  14  *
  15  * This driver is written to be used with the Metronome display controller.
  16  * on the AM200 EPD prototype kit/development kit with an E-Ink 800x600
  17  * Vizplex EPD on a Gumstix board using the Lyre interface board.
  18  *
  19  */
  20
  21 #include <linux/module.h>
  22 #include <linux/kernel.h>
  23 #include <linux/errno.h>
  24 #include <linux/string.h>
  25 #include <linux/delay.h>
  26 #include <linux/interrupt.h>
  27 #include <linux/fb.h>
  28 #include <linux/init.h>
  29 #include <linux/platform_device.h>
  30 #include <linux/irq.h>
  31 #include <linux/gpio.h>
  32
  33 #include <mach/pxa25x.h>
  34 #include <mach/gumstix.h>
  35 #include <mach/pxafb.h>
  36
  37 #include "generic.h"
  38
  39 #include <video/metronomefb.h>
  40
  41 static unsigned int panel_type = 6;
  42 static struct platform_device *am200_device;
  43 static struct metronome_board am200_board;
  44
  45 static struct pxafb_mode_info am200_fb_mode_9inch7 = {
  46         .pixclock       = 40000,
  47         .xres           = 1200,
  48         .yres           = 842,
  49         .bpp            = 16,
  50         .hsync_len      = 2,
  51         .left_margin    = 2,
  52         .right_margin   = 2,
  53         .vsync_len      = 1,
  54         .upper_margin   = 2,
  55         .lower_margin   = 25,
  56         .sync           = FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
  57 };
  58
  59 static struct pxafb_mode_info am200_fb_mode_8inch = {
  60         .pixclock       = 40000,
  61         .xres           = 1088,
  62         .yres           = 791,
  63         .bpp            = 16,
  64         .hsync_len      = 28,
  65         .left_margin    = 8,
  66         .right_margin   = 30,
  67         .vsync_len      = 8,
  68         .upper_margin   = 10,
  69         .lower_margin   = 8,
  70         .sync           = FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
  71 };
  72
  73 static struct pxafb_mode_info am200_fb_mode_6inch = {
  74         .pixclock       = 40189,
  75         .xres           = 832,
  76         .yres           = 622,
  77         .bpp            = 16,
  78         .hsync_len      = 28,
  79         .left_margin    = 34,
  80         .right_margin   = 34,
  81         .vsync_len      = 25,
  82         .upper_margin   = 0,
  83         .lower_margin   = 2,
  84         .sync           = FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
  85 };
  86
  87 static struct pxafb_mach_info am200_fb_info = {
  88         .modes          = &am200_fb_mode_6inch,
  89         .num_modes      = 1,
  90         .lcd_conn       = LCD_TYPE_COLOR_TFT | LCD_PCLK_EDGE_FALL |
  91                           LCD_AC_BIAS_FREQ(24),
  92 };
  93
  94 /* register offsets for gpio control */
  95 #define LED_GPIO_PIN 51
  96 #define STDBY_GPIO_PIN 48
  97 #define RST_GPIO_PIN 49
  98 #define RDY_GPIO_PIN 32
  99 #define ERR_GPIO_PIN 17
 100 #define PCBPWR_GPIO_PIN 16
 101 static int gpios[] = { LED_GPIO_PIN , STDBY_GPIO_PIN , RST_GPIO_PIN,
 102                         RDY_GPIO_PIN, ERR_GPIO_PIN, PCBPWR_GPIO_PIN };
 103 static char *gpio_names[] = { "LED" , "STDBY" , "RST", "RDY", "ERR", "PCBPWR" };
 104
 105 static int am200_init_gpio_regs(struct metronomefb_par *par)
 106 {
 107         int i;
 108         int err;
 109
 110         for (i = 0; i < ARRAY_SIZE(gpios); i++) {
 111                 err = gpio_request(gpios[i], gpio_names[i]);
 112                 if (err) {
 113                         dev_err(&am200_device->dev, "failed requesting "
 114                                 "gpio %s, err=%d\n", gpio_names[i], err);
 115                         goto err_req_gpio;
 116                 }
 117         }
 118
 119         gpio_direction_output(LED_GPIO_PIN, 0);
 120         gpio_direction_output(STDBY_GPIO_PIN, 0);
 121         gpio_direction_output(RST_GPIO_PIN, 0);
 122
 123         gpio_direction_input(RDY_GPIO_PIN);
 124         gpio_direction_input(ERR_GPIO_PIN);
 125
 126         gpio_direction_output(PCBPWR_GPIO_PIN, 0);
 127
 128         return 0;
 129
 130 err_req_gpio:
 131         while (i > 0)
 132                 gpio_free(gpios[i--]);
 133
 134         return err;
 135 }
 136
 137 static void am200_cleanup(struct metronomefb_par *par)
 138 {
 139         int i;
 140
 141         free_irq(IRQ_GPIO(RDY_GPIO_PIN), par);
 142
 143         for (i = 0; i < ARRAY_SIZE(gpios); i++)
 144                 gpio_free(gpios[i]);
 145 }
 146
 147 static int am200_share_video_mem(struct fb_info *info)
 148 {
 149         /* rough check if this is our desired fb and not something else */
 150         if ((info->var.xres != am200_fb_info.modes->xres)
 151                 || (info->var.yres != am200_fb_info.modes->yres))
 152                 return 0;
 153
 154         /* we've now been notified that we have our new fb */
 155         am200_board.metromem = info->screen_base;
 156         am200_board.host_fbinfo = info;
 157
 158         /* try to refcount host drv since we are the consumer after this */
 159         if (!try_module_get(info->fbops->owner))
 160                 return -ENODEV;
 161
 162         return 0;
 163 }
 164
 165 static int am200_unshare_video_mem(struct fb_info *info)
 166 {
 167         dev_dbg(&am200_device->dev, "ENTER %s\n", __func__);
 168
 169         if (info != am200_board.host_fbinfo)
 170                 return 0;
 171
 172         module_put(am200_board.host_fbinfo->fbops->owner);
 173         return 0;
 174 }
 175
 176 static int am200_fb_notifier_callback(struct notifier_block *self,
 177                                  unsigned long event, void *data)
 178 {
 179         struct fb_event *evdata = data;
 180         struct fb_info *info = evdata->info;
 181
 182         dev_dbg(&am200_device->dev, "ENTER %s\n", __func__);
 183
 184         if (event == FB_EVENT_FB_REGISTERED)
 185                 return am200_share_video_mem(info);
 186         else if (event == FB_EVENT_FB_UNREGISTERED)
 187                 return am200_unshare_video_mem(info);
 188
 189         return 0;
 190 }
 191
 192 static struct notifier_block am200_fb_notif = {
 193         .notifier_call = am200_fb_notifier_callback,
 194 };
 195
 196 /* this gets called as part of our init. these steps must be done now so
 197  * that we can use set_pxa_fb_info */
 198 static void __init am200_presetup_fb(void)
 199 {
 200         int fw;
 201         int fh;
 202         int padding_size;
 203         int totalsize;
 204
 205         switch (panel_type) {
 206         case 6:
 207                 am200_fb_info.modes = &am200_fb_mode_6inch;
 208                 break;
 209         case 8:
 210                 am200_fb_info.modes = &am200_fb_mode_8inch;
 211                 break;
 212         case 97:
 213                 am200_fb_info.modes = &am200_fb_mode_9inch7;
 214                 break;
 215         default:
 216                 dev_err(&am200_device->dev, "invalid panel_type selection,"
 217                                                 " setting to 6\n");
 218                 am200_fb_info.modes = &am200_fb_mode_6inch;
 219                 break;
 220         }
 221
 222         /* the frame buffer is divided as follows:
 223         command | CRC | padding
 224         16kb waveform data | CRC | padding
 225         image data | CRC
 226         */
 227
 228         fw = am200_fb_info.modes->xres;
 229         fh = am200_fb_info.modes->yres;
 230
 231         /* waveform must be 16k + 2 for checksum */
 232         am200_board.wfm_size = roundup(16*1024 + 2, fw);
 233
 234         padding_size = PAGE_SIZE + (4 * fw);
 235
 236         /* total is 1 cmd , 1 wfm, padding and image */
 237         totalsize = fw + am200_board.wfm_size + padding_size + (fw*fh);
 238
 239         /* save this off because we're manipulating fw after this and
 240          * we'll need it when we're ready to setup the framebuffer */
 241         am200_board.fw = fw;
 242         am200_board.fh = fh;
 243
 244         /* the reason we do this adjustment is because we want to acquire
 245          * more framebuffer memory without imposing custom awareness on the
 246          * underlying pxafb driver */
 247         am200_fb_info.modes->yres = DIV_ROUND_UP(totalsize, fw);
 248
 249         /* we divide since we told the LCD controller we're 16bpp */
 250         am200_fb_info.modes->xres /= 2;
 251
 252         set_pxa_fb_info(&am200_fb_info);
 253
 254 }
 255
 256 /* this gets called by metronomefb as part of its init, in our case, we
 257  * have already completed initial framebuffer init in presetup_fb so we
 258  * can just setup the fb access pointers */
 259 static int am200_setup_fb(struct metronomefb_par *par)
 260 {
 261         int fw;
 262         int fh;
 263
 264         fw = am200_board.fw;
 265         fh = am200_board.fh;
 266
 267         /* metromem was set up by the notifier in share_video_mem so now
 268          * we can use its value to calculate the other entries */
 269         par->metromem_cmd = (struct metromem_cmd *) am200_board.metromem;
 270         par->metromem_wfm = am200_board.metromem + fw;
 271         par->metromem_img = par->metromem_wfm + am200_board.wfm_size;
 272         par->metromem_img_csum = (u16 *) (par->metromem_img + (fw * fh));
 273         par->metromem_dma = am200_board.host_fbinfo->fix.smem_start;
 274
 275         return 0;
 276 }
 277
 278 static int am200_get_panel_type(void)
 279 {
 280         return panel_type;
 281 }
 282
 283 static irqreturn_t am200_handle_irq(int irq, void *dev_id)
 284 {
 285         struct metronomefb_par *par = dev_id;
 286
 287         wake_up_interruptible(&par->waitq);
 288         return IRQ_HANDLED;
 289 }
 290
 291 static int am200_setup_irq(struct fb_info *info)
 292 {
 293         int ret;
 294
 295         ret = request_irq(IRQ_GPIO(RDY_GPIO_PIN), am200_handle_irq,
 296                                 IRQF_DISABLED|IRQF_TRIGGER_FALLING,
 297                                 "AM200", info->par);
 298         if (ret)
 299                 dev_err(&am200_device->dev, "request_irq failed: %d\n", ret);
 300
 301         return ret;
 302 }
 303
 304 static void am200_set_rst(struct metronomefb_par *par, int state)
 305 {
 306         gpio_set_value(RST_GPIO_PIN, state);
 307 }
 308
 309 static void am200_set_stdby(struct metronomefb_par *par, int state)
 310 {
 311         gpio_set_value(STDBY_GPIO_PIN, state);
 312 }
 313
 314 static int am200_wait_event(struct metronomefb_par *par)
 315 {
 316         return wait_event_timeout(par->waitq, gpio_get_value(RDY_GPIO_PIN), HZ);
 317 }
 318
 319 static int am200_wait_event_intr(struct metronomefb_par *par)
 320 {
 321         return wait_event_interruptible_timeout(par->waitq,
 322                                         gpio_get_value(RDY_GPIO_PIN), HZ);
 323 }
 324
 325 static struct metronome_board am200_board = {
 326         .owner                  = THIS_MODULE,
 327         .setup_irq              = am200_setup_irq,
 328         .setup_io               = am200_init_gpio_regs,
 329         .setup_fb               = am200_setup_fb,
 330         .set_rst                = am200_set_rst,
 331         .set_stdby              = am200_set_stdby,
 332         .met_wait_event         = am200_wait_event,
 333         .met_wait_event_intr    = am200_wait_event_intr,
 334         .get_panel_type         = am200_get_panel_type,
 335         .cleanup                = am200_cleanup,
 336 };
 337
 338 static unsigned long am200_pin_config[] __initdata = {
 339         GPIO51_GPIO,
 340         GPIO49_GPIO,
 341         GPIO48_GPIO,
 342         GPIO32_GPIO,
 343         GPIO17_GPIO,
 344         GPIO16_GPIO,
 345 };
 346
 347 int __init am200_init(void)
 348 {
 349         int ret;
 350
 351         /* before anything else, we request notification for any fb
 352          * creation events */
 353         fb_register_client(&am200_fb_notif);
 354
 355         pxa2xx_mfp_config(ARRAY_AND_SIZE(am200_pin_config));
 356
 357         /* request our platform independent driver */
 358         request_module("metronomefb");
 359
 360         am200_device = platform_device_alloc("metronomefb", -1);
 361         if (!am200_device)
 362                 return -ENOMEM;
 363
 364         /* the am200_board that will be seen by metronomefb is a copy */
 365         platform_device_add_data(am200_device, &am200_board,
 366                                         sizeof(am200_board));
 367
 368         /* this _add binds metronomefb to am200. metronomefb refcounts am200 */
 369         ret = platform_device_add(am200_device);
 370
 371         if (ret) {
 372                 platform_device_put(am200_device);
 373                 fb_unregister_client(&am200_fb_notif);
 374                 return ret;
 375         }
 376
 377         am200_presetup_fb();
 378
 379         return 0;
 380 }
 381
 382 module_param(panel_type, uint, 0);
 383 MODULE_PARM_DESC(panel_type, "Select the panel type: 6, 8, 97");
 384
 385 MODULE_DESCRIPTION("board driver for am200 metronome epd kit");
 386 MODULE_AUTHOR("Jaya Kumar");
 387 MODULE_LICENSE("GPL");