clcd.c
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/*
* linux/arch/arm/mach-nspire/clcd.c
*
* Copyright (C) 2013 Daniel Tang <tangrs@tangrs.id.au>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2, as
* published by the Free Software Foundation.
*
*/
#include <linux/init.h>
#include <linux/of.h>
#include <linux/amba/bus.h>
#include <linux/amba/clcd.h>
#include <linux/dma-mapping.h>
static struct clcd_panel nspire_cx_lcd_panel = {
.mode = {
.name = "Color LCD",
.refresh = 60,
.xres = 320,
.yres = 240,
.sync = 0,
.vmode = FB_VMODE_NONINTERLACED,
.pixclock = 1,
.hsync_len = 6,
.vsync_len = 1,
.right_margin = 50,
.left_margin = 38,
.lower_margin = 3,
.upper_margin = 17,
},
.width = 65, /* ~6.50 cm */
.height = 49, /* ~4.87 cm */
.tim2 = TIM2_IPC,
.cntl = CNTL_LCDTFT | CNTL_LCDVCOMP(1),
.bpp = 16,
.caps = CLCD_CAP_565,
};
static struct clcd_panel nspire_classic_lcd_panel = {
.mode = {
.name = "Grayscale LCD",
.refresh = 60,
.xres = 320,
.yres = 240,
.sync = FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
.vmode = FB_VMODE_NONINTERLACED,
.pixclock = 1,
.hsync_len = 6,
.vsync_len = 1,
.right_margin = 6,
.left_margin = 6,
},
.width = 71, /* 7.11cm */
.height = 53, /* 5.33cm */
.tim2 = 0x80007d0,
.cntl = CNTL_LCDMONO8,
.bpp = 8,
.grayscale = 1,
.caps = CLCD_CAP_5551,
};
int nspire_clcd_setup(struct clcd_fb *fb)
{
struct clcd_panel *panel;
size_t panel_size;
const char *type;
dma_addr_t dma;
int err;
BUG_ON(!fb->dev->dev.of_node);
err = of_property_read_string(fb->dev->dev.of_node, "lcd-type", &type);
if (err) {
pr_err("CLCD: Could not find lcd-type property\n");
return err;
}
if (!strcmp(type, "cx")) {
panel = &nspire_cx_lcd_panel;
} else if (!strcmp(type, "classic")) {
panel = &nspire_classic_lcd_panel;
} else {
pr_err("CLCD: Unknown lcd-type %s\n", type);
return -EINVAL;
}
panel_size = ((panel->mode.xres * panel->mode.yres) * panel->bpp) / 8;
panel_size = ALIGN(panel_size, PAGE_SIZE);
fb->fb.screen_base = dma_alloc_writecombine(&fb->dev->dev,
panel_size, &dma, GFP_KERNEL);
if (!fb->fb.screen_base) {
pr_err("CLCD: unable to map framebuffer\n");
return -ENOMEM;
}
fb->fb.fix.smem_start = dma;
fb->fb.fix.smem_len = panel_size;
fb->panel = panel;
return 0;
}
int nspire_clcd_mmap(struct clcd_fb *fb, struct vm_area_struct *vma)
{
return dma_mmap_writecombine(&fb->dev->dev, vma,
fb->fb.screen_base, fb->fb.fix.smem_start,
fb->fb.fix.smem_len);
}
void nspire_clcd_remove(struct clcd_fb *fb)
{
dma_free_writecombine(&fb->dev->dev, fb->fb.fix.smem_len,
fb->fb.screen_base, fb->fb.fix.smem_start);
}