kernel/arch/arm/mach-nspire/clcd.c

   1 /*
   2  *      linux/arch/arm/mach-nspire/clcd.c
   3  *
   4  *      Copyright (C) 2013 Daniel Tang <tangrs@tangrs.id.au>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2, as
   8  * published by the Free Software Foundation.
   9  *
  10  */
  11
  12 #include <linux/init.h>
  13 #include <linux/of.h>
  14 #include <linux/amba/bus.h>
  15 #include <linux/amba/clcd.h>
  16 #include <linux/dma-mapping.h>
  17
  18 static struct clcd_panel nspire_cx_lcd_panel = {
  19         .mode           = {
  20                 .name           = "Color LCD",
  21                 .refresh        = 60,
  22                 .xres           = 320,
  23                 .yres           = 240,
  24                 .sync           = 0,
  25                 .vmode          = FB_VMODE_NONINTERLACED,
  26                 .pixclock       = 1,
  27                 .hsync_len      = 6,
  28                 .vsync_len      = 1,
  29                 .right_margin   = 50,
  30                 .left_margin    = 38,
  31                 .lower_margin   = 3,
  32                 .upper_margin   = 17,
  33         },
  34         .width          = 65, /* ~6.50 cm */
  35         .height         = 49, /* ~4.87 cm */
  36         .tim2           = TIM2_IPC,
  37         .cntl           = CNTL_LCDTFT | CNTL_LCDVCOMP(1),
  38         .bpp            = 16,
  39         .caps           = CLCD_CAP_565,
  40 };
  41
  42 static struct clcd_panel nspire_classic_lcd_panel = {
  43         .mode           = {
  44                 .name           = "Grayscale LCD",
  45                 .refresh        = 60,
  46                 .xres           = 320,
  47                 .yres           = 240,
  48                 .sync           = FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
  49                 .vmode          = FB_VMODE_NONINTERLACED,
  50                 .pixclock       = 1,
  51                 .hsync_len      = 6,
  52                 .vsync_len      = 1,
  53                 .right_margin   = 6,
  54                 .left_margin    = 6,
  55         },
  56         .width          = 71, /* 7.11cm */
  57         .height         = 53, /* 5.33cm */
  58         .tim2           = 0x80007d0,
  59         .cntl           = CNTL_LCDMONO8,
  60         .bpp            = 8,
  61         .grayscale      = 1,
  62         .caps           = CLCD_CAP_5551,
  63 };
  64
  65 int nspire_clcd_setup(struct clcd_fb *fb)
  66 {
  67         struct clcd_panel *panel;
  68         size_t panel_size;
  69         const char *type;
  70         dma_addr_t dma;
  71         int err;
  72
  73         BUG_ON(!fb->dev->dev.of_node);
  74
  75         err = of_property_read_string(fb->dev->dev.of_node, "lcd-type", &type);
  76         if (err) {
  77                 pr_err("CLCD: Could not find lcd-type property\n");
  78                 return err;
  79         }
  80
  81         if (!strcmp(type, "cx")) {
  82                 panel = &nspire_cx_lcd_panel;
  83         } else if (!strcmp(type, "classic")) {
  84                 panel = &nspire_classic_lcd_panel;
  85         } else {
  86                 pr_err("CLCD: Unknown lcd-type %s\n", type);
  87                 return -EINVAL;
  88         }
  89
  90         panel_size = ((panel->mode.xres * panel->mode.yres) * panel->bpp) / 8;
  91         panel_size = ALIGN(panel_size, PAGE_SIZE);
  92
  93         fb->fb.screen_base = dma_alloc_writecombine(&fb->dev->dev,
  94                 panel_size, &dma, GFP_KERNEL);
  95
  96         if (!fb->fb.screen_base) {
  97                 pr_err("CLCD: unable to map framebuffer\n");
  98                 return -ENOMEM;
  99         }
 100
 101         fb->fb.fix.smem_start = dma;
 102         fb->fb.fix.smem_len = panel_size;
 103         fb->panel = panel;
 104
 105         return 0;
 106 }
 107
 108 int nspire_clcd_mmap(struct clcd_fb *fb, struct vm_area_struct *vma)
 109 {
 110         return dma_mmap_writecombine(&fb->dev->dev, vma,
 111                 fb->fb.screen_base, fb->fb.fix.smem_start,
 112                 fb->fb.fix.smem_len);
 113 }
 114
 115 void nspire_clcd_remove(struct clcd_fb *fb)
 116 {
 117         dma_free_writecombine(&fb->dev->dev, fb->fb.fix.smem_len,
 118                 fb->fb.screen_base, fb->fb.fix.smem_start);
 119 }