--- /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");
Code Review / kvmfornfv.git / blobdiff