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
nspire_clcd_setup(struct clcd_fb * fb)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_wc(&fb->dev->dev, panel_size, &dma,
94 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
nspire_clcd_mmap(struct clcd_fb * fb,struct vm_area_struct * vma)108 int nspire_clcd_mmap(struct clcd_fb *fb, struct vm_area_struct *vma)
109 {
110 return dma_mmap_wc(&fb->dev->dev, vma, fb->fb.screen_base,
111 fb->fb.fix.smem_start, fb->fb.fix.smem_len);
112 }
113
nspire_clcd_remove(struct clcd_fb * fb)114 void nspire_clcd_remove(struct clcd_fb *fb)
115 {
116 dma_free_wc(&fb->dev->dev, fb->fb.fix.smem_len, fb->fb.screen_base,
117 fb->fb.fix.smem_start);
118 }
119