/* * 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/module.h> #include <linux/kernel.h> #include <linux/slab.h> #include <linux/fb.h> #include <linux/init.h> #include <linux/proc_fs.h> #include <linux/delay.h> #include <asm/hardware.h> #include <asm/mach-types.h> #include <asm/uaccess.h> #include <asm/hardware/clps7111.h> #include <asm/arch/syspld.h> struct fb_info *cfb; #define CMAP_MAX_SIZE 16 /* The /proc entry for the backlight. */ static struct proc_dir_entry *clps7111fb_backlight_proc_entry = NULL; static int clps7111fb_proc_backlight_read(char *page, char **start, off_t off, int count, int *eof, void *data); static int clps7111fb_proc_backlight_write(struct file *file, const char *buffer, unsigned long count, void *data); /* * 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) { if (blank) { if (machine_is_edb7211()) { /* Turn off the LCD backlight. */ clps_writeb(clps_readb(PDDR) & ~EDB_PD3_LCDBL, PDDR); /* Power off the LCD DC-DC converter. */ clps_writeb(clps_readb(PDDR) & ~EDB_PD1_LCD_DC_DC_EN, PDDR); /* Delay for a little while (half a second). */ udelay(100); /* Power off the LCD panel. */ clps_writeb(clps_readb(PDDR) & ~EDB_PD2_LCDEN, PDDR); /* Power off the LCD controller. */ clps_writel(clps_readl(SYSCON1) & ~SYSCON1_LCDEN, SYSCON1); } } else { if (machine_is_edb7211()) { /* Power up the LCD controller. */ clps_writel(clps_readl(SYSCON1) | SYSCON1_LCDEN, SYSCON1); /* Power up the LCD panel. */ clps_writeb(clps_readb(PDDR) | EDB_PD2_LCDEN, PDDR); /* Delay for a little while. */ udelay(100); /* Power up the LCD DC-DC converter. */ clps_writeb(clps_readb(PDDR) | EDB_PD1_LCD_DC_DC_EN, PDDR); /* Turn on the LCD backlight. */ clps_writeb(clps_readb(PDDR) | EDB_PD3_LCDBL, PDDR); } } 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 int clps7111fb_proc_backlight_read(char *page, char **start, off_t off, int count, int *eof, void *data) { /* We need at least two characters, one for the digit, and one for * the terminating NULL. */ if (count < 2) return -EINVAL; if (machine_is_edb7211()) { return sprintf(page, "%d\n", (clps_readb(PDDR) & EDB_PD3_LCDBL) ? 1 : 0); } return 0; } static int clps7111fb_proc_backlight_write(struct file *file, const char *buffer, unsigned long count, void *data) { unsigned char char_value; int value; if (count < 1) { return -EINVAL; } if (copy_from_user(&char_value, buffer, 1)) return -EFAULT; value = char_value - '0'; if (machine_is_edb7211()) { unsigned char port_d; port_d = clps_readb(PDDR); if (value) { port_d |= EDB_PD3_LCDBL; } else { port_d &= ~EDB_PD3_LCDBL; } clps_writeb(port_d, PDDR); } return count; } static void __init 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; } int __init clps711xfb_init(void) { int err = -ENOMEM; if (fb_get_options("clps711xfb", NULL)) return -ENODEV; cfb = kmalloc(sizeof(*cfb), GFP_KERNEL); if (!cfb) goto out; memset(cfb, 0, sizeof(*cfb)); 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); /* Register the /proc entries. */ clps7111fb_backlight_proc_entry = create_proc_entry("backlight", 0444, &proc_root); if (clps7111fb_backlight_proc_entry == NULL) { printk("Couldn't create the /proc entry for the backlight.\n"); return -EINVAL; } clps7111fb_backlight_proc_entry->read_proc = &clps7111fb_proc_backlight_read; clps7111fb_backlight_proc_entry->write_proc = &clps7111fb_proc_backlight_write; /* * Power up the LCD */ if (machine_is_p720t()) { PLD_LCDEN = PLD_LCDEN_EN; PLD_PWR |= (PLD_S4_ON|PLD_S3_ON|PLD_S2_ON|PLD_S1_ON); } if (machine_is_edb7211()) { /* Power up the LCD panel. */ clps_writeb(clps_readb(PDDR) | EDB_PD2_LCDEN, PDDR); /* Delay for a little while. */ udelay(100); /* Power up the LCD DC-DC converter. */ clps_writeb(clps_readb(PDDR) | EDB_PD1_LCD_DC_DC_EN, PDDR); /* Turn on the LCD backlight. */ clps_writeb(clps_readb(PDDR) | EDB_PD3_LCDBL, PDDR); } err = register_framebuffer(cfb); out: return err; } static void __exit clps711xfb_exit(void) { unregister_framebuffer(cfb); kfree(cfb); /* * Power down the LCD */ if (machine_is_p720t()) { PLD_LCDEN = 0; PLD_PWR &= ~(PLD_S4_ON|PLD_S3_ON|PLD_S2_ON|PLD_S1_ON); } } module_init(clps711xfb_init); module_exit(clps711xfb_exit); MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>"); MODULE_DESCRIPTION("CLPS711x framebuffer driver"); MODULE_LICENSE("GPL");