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
 18static 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
 42static 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
 65int 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
108int 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
115void 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}