1 // SPDX-License-Identifier: GPL-2.0-only
3 * linux/arch/arm/mach-nspire/clcd.c
5 * Copyright (C) 2013 Daniel Tang <tangrs@tangrs.id.au>
8 #include <linux/init.h>
10 #include <linux/amba/bus.h>
11 #include <linux/amba/clcd.h>
12 #include <linux/dma-mapping.h>
14 static struct clcd_panel nspire_cx_lcd_panel = {
21 .vmode = FB_VMODE_NONINTERLACED,
30 .width = 65, /* ~6.50 cm */
31 .height = 49, /* ~4.87 cm */
33 .cntl = CNTL_LCDTFT | CNTL_LCDVCOMP(1),
38 static struct clcd_panel nspire_classic_lcd_panel = {
40 .name = "Grayscale LCD",
44 .sync = FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
45 .vmode = FB_VMODE_NONINTERLACED,
52 .width = 71, /* 7.11cm */
53 .height = 53, /* 5.33cm */
55 .cntl = CNTL_LCDMONO8,
58 .caps = CLCD_CAP_5551,
61 int nspire_clcd_setup(struct clcd_fb *fb)
63 struct clcd_panel *panel;
69 BUG_ON(!fb->dev->dev.of_node);
71 err = of_property_read_string(fb->dev->dev.of_node, "lcd-type", &type);
73 pr_err("CLCD: Could not find lcd-type property\n");
77 if (!strcmp(type, "cx")) {
78 panel = &nspire_cx_lcd_panel;
79 } else if (!strcmp(type, "classic")) {
80 panel = &nspire_classic_lcd_panel;
82 pr_err("CLCD: Unknown lcd-type %s\n", type);
86 panel_size = ((panel->mode.xres * panel->mode.yres) * panel->bpp) / 8;
87 panel_size = ALIGN(panel_size, PAGE_SIZE);
89 fb->fb.screen_base = dma_alloc_wc(&fb->dev->dev, panel_size, &dma,
92 if (!fb->fb.screen_base) {
93 pr_err("CLCD: unable to map framebuffer\n");
97 fb->fb.fix.smem_start = dma;
98 fb->fb.fix.smem_len = panel_size;
104 int nspire_clcd_mmap(struct clcd_fb *fb, struct vm_area_struct *vma)
106 return dma_mmap_wc(&fb->dev->dev, vma, fb->fb.screen_base,
107 fb->fb.fix.smem_start, fb->fb.fix.smem_len);
110 void nspire_clcd_remove(struct clcd_fb *fb)
112 dma_free_wc(&fb->dev->dev, fb->fb.fix.smem_len, fb->fb.screen_base,
113 fb->fb.fix.smem_start);