arch/arm/mach-nspire/clcd.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  *      linux/arch/arm/mach-nspire/clcd.c
   4  *
   5  *      Copyright (C) 2013 Daniel Tang <tangrs@tangrs.id.au>
   6  */
   7
   8 #include <linux/init.h>
   9 #include <linux/of.h>
  10 #include <linux/amba/bus.h>
  11 #include <linux/amba/clcd.h>
  12 #include <linux/dma-mapping.h>
  13
  14 static struct clcd_panel nspire_cx_lcd_panel = {
  15         .mode           = {
  16                 .name           = "Color LCD",
  17                 .refresh        = 60,
  18                 .xres           = 320,
  19                 .yres           = 240,
  20                 .sync           = 0,
  21                 .vmode          = FB_VMODE_NONINTERLACED,
  22                 .pixclock       = 1,
  23                 .hsync_len      = 6,
  24                 .vsync_len      = 1,
  25                 .right_margin   = 50,
  26                 .left_margin    = 38,
  27                 .lower_margin   = 3,
  28                 .upper_margin   = 17,
  29         },
  30         .width          = 65, /* ~6.50 cm */
  31         .height         = 49, /* ~4.87 cm */
  32         .tim2           = TIM2_IPC,
  33         .cntl           = CNTL_LCDTFT | CNTL_LCDVCOMP(1),
  34         .bpp            = 16,
  35         .caps           = CLCD_CAP_565,
  36 };
  37
  38 static struct clcd_panel nspire_classic_lcd_panel = {
  39         .mode           = {
  40                 .name           = "Grayscale LCD",
  41                 .refresh        = 60,
  42                 .xres           = 320,
  43                 .yres           = 240,
  44                 .sync           = FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
  45                 .vmode          = FB_VMODE_NONINTERLACED,
  46                 .pixclock       = 1,
  47                 .hsync_len      = 6,
  48                 .vsync_len      = 1,
  49                 .right_margin   = 6,
  50                 .left_margin    = 6,
  51         },
  52         .width          = 71, /* 7.11cm */
  53         .height         = 53, /* 5.33cm */
  54         .tim2           = 0x80007d0,
  55         .cntl           = CNTL_LCDMONO8,
  56         .bpp            = 8,
  57         .grayscale      = 1,
  58         .caps           = CLCD_CAP_5551,
  59 };
  60
  61 int nspire_clcd_setup(struct clcd_fb *fb)
  62 {
  63         struct clcd_panel *panel;
  64         size_t panel_size;
  65         const char *type;
  66         dma_addr_t dma;
  67         int err;
  68
  69         BUG_ON(!fb->dev->dev.of_node);
  70
  71         err = of_property_read_string(fb->dev->dev.of_node, "lcd-type", &type);
  72         if (err) {
  73                 pr_err("CLCD: Could not find lcd-type property\n");
  74                 return err;
  75         }
  76
  77         if (!strcmp(type, "cx")) {
  78                 panel = &nspire_cx_lcd_panel;
  79         } else if (!strcmp(type, "classic")) {
  80                 panel = &nspire_classic_lcd_panel;
  81         } else {
  82                 pr_err("CLCD: Unknown lcd-type %s\n", type);
  83                 return -EINVAL;
  84         }
  85
  86         panel_size = ((panel->mode.xres * panel->mode.yres) * panel->bpp) / 8;
  87         panel_size = ALIGN(panel_size, PAGE_SIZE);
  88
  89         fb->fb.screen_base = dma_alloc_wc(&fb->dev->dev, panel_size, &dma,
  90                                           GFP_KERNEL);
  91
  92         if (!fb->fb.screen_base) {
  93                 pr_err("CLCD: unable to map framebuffer\n");
  94                 return -ENOMEM;
  95         }
  96
  97         fb->fb.fix.smem_start = dma;
  98         fb->fb.fix.smem_len = panel_size;
  99         fb->panel = panel;
 100
 101         return 0;
 102 }
 103
 104 int nspire_clcd_mmap(struct clcd_fb *fb, struct vm_area_struct *vma)
 105 {
 106         return dma_mmap_wc(&fb->dev->dev, vma, fb->fb.screen_base,
 107                            fb->fb.fix.smem_start, fb->fb.fix.smem_len);
 108 }
 109
 110 void nspire_clcd_remove(struct clcd_fb *fb)
 111 {
 112         dma_free_wc(&fb->dev->dev, fb->fb.fix.smem_len, fb->fb.screen_base,
 113                     fb->fb.fix.smem_start);
 114 }