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Diffstat (limited to '')
| -rw-r--r-- | drivers/video/fbdev/clps711xfb.c | 314 |
1 files changed, 314 insertions, 0 deletions
diff --git a/drivers/video/fbdev/clps711xfb.c b/drivers/video/fbdev/clps711xfb.c new file mode 100644 index 000000000..7693aea8f --- /dev/null +++ b/drivers/video/fbdev/clps711xfb.c @@ -0,0 +1,314 @@ +/* + * linux/drivers/video/clps711xfb.c + * + * Copyright (C) 2000-2001 Deep Blue Solutions Ltd. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + * Framebuffer driver for the CLPS7111 and EP7212 processors. + */ +#include <linux/mm.h> +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/slab.h> +#include <linux/fb.h> +#include <linux/init.h> +#include <linux/delay.h> +#include <linux/platform_device.h> + +#include <mach/hardware.h> +#include <asm/mach-types.h> +#include <linux/uaccess.h> + +struct fb_info *cfb; + +#define CMAP_MAX_SIZE 16 + +/* + * LCD AC Prescale. This comes from the LCD panel manufacturers specifications. + * This determines how many clocks + 1 of CL1 before the M signal toggles. + * The number of lines on the display must not be divisible by this number. + */ +static unsigned int lcd_ac_prescale = 13; + +/* + * Set a single color register. Return != 0 for invalid regno. + */ +static int +clps7111fb_setcolreg(u_int regno, u_int red, u_int green, u_int blue, + u_int transp, struct fb_info *info) +{ + unsigned int level, mask, shift, pal; + + if (regno >= (1 << info->var.bits_per_pixel)) + return 1; + + /* gray = 0.30*R + 0.58*G + 0.11*B */ + level = (red * 77 + green * 151 + blue * 28) >> 20; + + /* + * On an LCD, a high value is dark, while a low value is light. + * So we invert the level. + * + * This isn't true on all machines, so we only do it on EDB7211. + * --rmk + */ + if (machine_is_edb7211()) { + level = 15 - level; + } + + shift = 4 * (regno & 7); + level <<= shift; + mask = 15 << shift; + level &= mask; + + regno = regno < 8 ? PALLSW : PALMSW; + + pal = clps_readl(regno); + pal = (pal & ~mask) | level; + clps_writel(pal, regno); + + return 0; +} + +/* + * Validate the purposed mode. + */ +static int +clps7111fb_check_var(struct fb_var_screeninfo *var, struct fb_info *info) +{ + var->transp.msb_right = 0; + var->transp.offset = 0; + var->transp.length = 0; + var->red.msb_right = 0; + var->red.offset = 0; + var->red.length = var->bits_per_pixel; + var->green = var->red; + var->blue = var->red; + + if (var->bits_per_pixel > 4) + return -EINVAL; + + return 0; +} + +/* + * Set the hardware state. + */ +static int +clps7111fb_set_par(struct fb_info *info) +{ + unsigned int lcdcon, syscon, pixclock; + + switch (info->var.bits_per_pixel) { + case 1: + info->fix.visual = FB_VISUAL_MONO01; + break; + case 2: + info->fix.visual = FB_VISUAL_PSEUDOCOLOR; + break; + case 4: + info->fix.visual = FB_VISUAL_PSEUDOCOLOR; + break; + } + + info->fix.line_length = info->var.xres_virtual * info->var.bits_per_pixel / 8; + + lcdcon = (info->var.xres_virtual * info->var.yres_virtual * info->var.bits_per_pixel) / 128 - 1; + lcdcon |= ((info->var.xres_virtual / 16) - 1) << 13; + lcdcon |= lcd_ac_prescale << 25; + + /* + * Calculate pixel prescale value from the pixclock. This is: + * 36.864MHz / pixclock_mhz - 1. + * However, pixclock is in picoseconds, so this ends up being: + * 36864000 * pixclock_ps / 10^12 - 1 + * and this will overflow the 32-bit math. We perform this as + * (9 * 4096000 == 36864000): + * pixclock_ps * 9 * (4096000 / 10^12) - 1 + */ + pixclock = 9 * info->var.pixclock / 244140 - 1; + lcdcon |= pixclock << 19; + + if (info->var.bits_per_pixel == 4) + lcdcon |= LCDCON_GSMD; + if (info->var.bits_per_pixel >= 2) + lcdcon |= LCDCON_GSEN; + + /* + * LCDCON must only be changed while the LCD is disabled + */ + syscon = clps_readl(SYSCON1); + clps_writel(syscon & ~SYSCON1_LCDEN, SYSCON1); + clps_writel(lcdcon, LCDCON); + clps_writel(syscon | SYSCON1_LCDEN, SYSCON1); + return 0; +} + +static int clps7111fb_blank(int blank, struct fb_info *info) +{ + /* Enable/Disable LCD controller. */ + if (blank) + clps_writel(clps_readl(SYSCON1) & ~SYSCON1_LCDEN, SYSCON1); + else + clps_writel(clps_readl(SYSCON1) | SYSCON1_LCDEN, SYSCON1); + + return 0; +} + +static struct fb_ops clps7111fb_ops = { + .owner = THIS_MODULE, + .fb_check_var = clps7111fb_check_var, + .fb_set_par = clps7111fb_set_par, + .fb_setcolreg = clps7111fb_setcolreg, + .fb_blank = clps7111fb_blank, + .fb_fillrect = cfb_fillrect, + .fb_copyarea = cfb_copyarea, + .fb_imageblit = cfb_imageblit, +}; + +static void clps711x_guess_lcd_params(struct fb_info *info) +{ + unsigned int lcdcon, syscon, size; + unsigned long phys_base = PAGE_OFFSET; + void *virt_base = (void *)PAGE_OFFSET; + + info->var.xres_virtual = 640; + info->var.yres_virtual = 240; + info->var.bits_per_pixel = 4; + info->var.activate = FB_ACTIVATE_NOW; + info->var.height = -1; + info->var.width = -1; + info->var.pixclock = 93006; /* 10.752MHz pixel clock */ + + /* + * If the LCD controller is already running, decode the values + * in LCDCON to xres/yres/bpp/pixclock/acprescale + */ + syscon = clps_readl(SYSCON1); + if (syscon & SYSCON1_LCDEN) { + lcdcon = clps_readl(LCDCON); + + /* + * Decode GSMD and GSEN bits to bits per pixel + */ + switch (lcdcon & (LCDCON_GSMD | LCDCON_GSEN)) { + case LCDCON_GSMD | LCDCON_GSEN: + info->var.bits_per_pixel = 4; + break; + + case LCDCON_GSEN: + info->var.bits_per_pixel = 2; + break; + + default: + info->var.bits_per_pixel = 1; + break; + } + + /* + * Decode xres/yres + */ + info->var.xres_virtual = (((lcdcon >> 13) & 0x3f) + 1) * 16; + info->var.yres_virtual = (((lcdcon & 0x1fff) + 1) * 128) / + (info->var.xres_virtual * + info->var.bits_per_pixel); + + /* + * Calculate pixclock + */ + info->var.pixclock = (((lcdcon >> 19) & 0x3f) + 1) * 244140 / 9; + + /* + * Grab AC prescale + */ + lcd_ac_prescale = (lcdcon >> 25) & 0x1f; + } + + info->var.xres = info->var.xres_virtual; + info->var.yres = info->var.yres_virtual; + info->var.grayscale = info->var.bits_per_pixel > 1; + + size = info->var.xres * info->var.yres * info->var.bits_per_pixel / 8; + + /* + * Might be worth checking to see if we can use the on-board + * RAM if size here... + * CLPS7110 - no on-board SRAM + * EP7212 - 38400 bytes + */ + if (size <= 38400) { + printk(KERN_INFO "CLPS711xFB: could use on-board SRAM?\n"); + } + + if ((syscon & SYSCON1_LCDEN) == 0) { + /* + * The display isn't running. Ensure that + * the display memory is empty. + */ + memset(virt_base, 0, size); + } + + info->screen_base = virt_base; + info->fix.smem_start = phys_base; + info->fix.smem_len = PAGE_ALIGN(size); + info->fix.type = FB_TYPE_PACKED_PIXELS; +} + +static int clps711x_fb_probe(struct platform_device *pdev) +{ + int err = -ENOMEM; + + if (fb_get_options("clps711xfb", NULL)) + return -ENODEV; + + cfb = kzalloc(sizeof(*cfb), GFP_KERNEL); + if (!cfb) + goto out; + + strcpy(cfb->fix.id, "clps711x"); + + cfb->fbops = &clps7111fb_ops; + cfb->flags = FBINFO_DEFAULT; + + clps711x_guess_lcd_params(cfb); + + fb_alloc_cmap(&cfb->cmap, CMAP_MAX_SIZE, 0); + + err = register_framebuffer(cfb); + +out: return err; +} + +static int clps711x_fb_remove(struct platform_device *pdev) +{ + unregister_framebuffer(cfb); + kfree(cfb); + + return 0; +} + +static struct platform_driver clps711x_fb_driver = { + .driver = { + .name = "video-clps711x", + }, + .probe = clps711x_fb_probe, + .remove = clps711x_fb_remove, +}; +module_platform_driver(clps711x_fb_driver); + +MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>"); +MODULE_DESCRIPTION("CLPS711X framebuffer driver"); +MODULE_LICENSE("GPL"); |