+++ /dev/null
-/*
- * 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");
projects / linux-2.6-microblaze.git / commitdiff