+++ /dev/null
-/*
- * linux/drivers/video/epson1355fb.c -- Epson S1D13505 frame buffer for 2.5.
- *
- * Epson Research S1D13505 Embedded RAMDAC LCD/CRT Controller
- * (previously known as SED1355)
- *
- * Cf. http://vdc.epson.com/
- *
- *
- * Copyright (C) Hewlett-Packard Company. All rights reserved.
- *
- * Written by Christopher Hoover <ch@hpl.hp.com>
- *
- * Adapted from:
- *
- * linux/drivers/video/skeletonfb.c
- * Modified to new api Jan 2001 by James Simmons (jsimmons@infradead.org)
- * Created 28 Dec 1997 by Geert Uytterhoeven
- *
- * linux/drivers/video/epson1355fb.c (2.4 driver)
- * Copyright (C) 2000 Philipp Rumpf <prumpf@tux.org>
- *
- * This file is subject to the terms and conditions of the GNU General Public
- * License. See the file COPYING in the main directory of this archive for
- * more details.
- *
- *
- * Noteworthy Issues
- * -----------------
- *
- * This driver is complicated by the fact that this is a 16-bit chip
- * and, on at least one platform (ceiva), we can only do 16-bit reads
- * and writes to the framebuffer. We hide this from user space
- * except in the case of mmap().
- *
- *
- * To Do
- * -----
- *
- * - Test 8-bit pseudocolor mode
- * - Allow setting bpp, virtual resolution
- * - Implement horizontal panning
- * - (maybe) Implement hardware cursor
- */
-
-#include <linux/module.h>
-#include <linux/kernel.h>
-#include <linux/errno.h>
-#include <linux/string.h>
-#include <linux/mm.h>
-#include <linux/delay.h>
-#include <linux/fb.h>
-#include <linux/init.h>
-#include <linux/ioport.h>
-#include <linux/platform_device.h>
-
-#include <asm/types.h>
-#include <asm/io.h>
-#include <linux/uaccess.h>
-
-#include <video/epson1355.h>
-
-struct epson1355_par {
- unsigned long reg_addr;
- u32 pseudo_palette[16];
-};
-
-/* ------------------------------------------------------------------------- */
-
-#if defined(CONFIG_ARM)
-
-# ifdef CONFIG_ARCH_CEIVA
-# include <mach/hardware.h>
-# define EPSON1355FB_BASE_PHYS (CEIVA_PHYS_SED1355)
-# endif
-
-static inline u8 epson1355_read_reg(struct epson1355_par *par, int index)
-{
- return __raw_readb(par->reg_addr + index);
-}
-
-static inline void epson1355_write_reg(struct epson1355_par *par, u8 data, int index)
-{
- __raw_writeb(data, par->reg_addr + index);
-}
-
-#else
-# error "no architecture-specific epson1355_{read,write}_reg"
-#endif
-
-#ifndef EPSON1355FB_BASE_PHYS
-# error "EPSON1355FB_BASE_PHYS is not defined"
-#endif
-
-#define EPSON1355FB_REGS_OFS (0)
-#define EPSON1355FB_REGS_PHYS (EPSON1355FB_BASE_PHYS + EPSON1355FB_REGS_OFS)
-#define EPSON1355FB_REGS_LEN (64)
-
-#define EPSON1355FB_FB_OFS (0x00200000)
-#define EPSON1355FB_FB_PHYS (EPSON1355FB_BASE_PHYS + EPSON1355FB_FB_OFS)
-#define EPSON1355FB_FB_LEN (2 * 1024 * 1024)
-
-/* ------------------------------------------------------------------------- */
-
-static inline u16 epson1355_read_reg16(struct epson1355_par *par, int index)
-{
- u8 lo = epson1355_read_reg(par, index);
- u8 hi = epson1355_read_reg(par, index + 1);
-
- return (hi << 8) | lo;
-}
-
-static inline void epson1355_write_reg16(struct epson1355_par *par, u16 data, int index)
-{
- u8 lo = data & 0xff;
- u8 hi = (data >> 8) & 0xff;
-
- epson1355_write_reg(par, lo, index);
- epson1355_write_reg(par, hi, index + 1);
-}
-
-static inline u32 epson1355_read_reg20(struct epson1355_par *par, int index)
-{
- u8 b0 = epson1355_read_reg(par, index);
- u8 b1 = epson1355_read_reg(par, index + 1);
- u8 b2 = epson1355_read_reg(par, index + 2);
-
- return (b2 & 0x0f) << 16 | (b1 << 8) | b0;
-}
-
-static inline void epson1355_write_reg20(struct epson1355_par *par, u32 data, int index)
-{
- u8 b0 = data & 0xff;
- u8 b1 = (data >> 8) & 0xff;
- u8 b2 = (data >> 16) & 0x0f;
-
- epson1355_write_reg(par, b0, index);
- epson1355_write_reg(par, b1, index + 1);
- epson1355_write_reg(par, b2, index + 2);
-}
-
-/* ------------------------------------------------------------------------- */
-
-static void set_lut(struct epson1355_par *par, u8 index, u8 r, u8 g, u8 b)
-{
- epson1355_write_reg(par, index, REG_LUT_ADDR);
- epson1355_write_reg(par, r, REG_LUT_DATA);
- epson1355_write_reg(par, g, REG_LUT_DATA);
- epson1355_write_reg(par, b, REG_LUT_DATA);
-}
-
-
-/**
- * epson1355fb_setcolreg - sets a color register.
- * @regno: Which register in the CLUT we are programming
- * @red: The red value which can be up to 16 bits wide
- * @green: The green value which can be up to 16 bits wide
- * @blue: The blue value which can be up to 16 bits wide.
- * @transp: If supported the alpha value which can be up to 16 bits wide.
- * @info: frame buffer info structure
- *
- * Returns negative errno on error, or zero on success.
- */
-static int epson1355fb_setcolreg(unsigned regno, unsigned r, unsigned g,
- unsigned b, unsigned transp,
- struct fb_info *info)
-{
- struct epson1355_par *par = info->par;
-
- if (info->var.grayscale)
- r = g = b = (19595 * r + 38470 * g + 7471 * b) >> 16;
-
- switch (info->fix.visual) {
- case FB_VISUAL_TRUECOLOR:
- if (regno >= 16)
- return -EINVAL;
-
- ((u32 *) info->pseudo_palette)[regno] =
- (r & 0xf800) | (g & 0xfc00) >> 5 | (b & 0xf800) >> 11;
-
- break;
- case FB_VISUAL_PSEUDOCOLOR:
- if (regno >= 256)
- return -EINVAL;
-
- set_lut(par, regno, r >> 8, g >> 8, b >> 8);
-
- break;
- default:
- return -ENOSYS;
- }
- return 0;
-}
-
-/* ------------------------------------------------------------------------- */
-
-/**
- * epson1355fb_pan_display - Pans the display.
- * @var: frame buffer variable screen structure
- * @info: frame buffer structure that represents a single frame buffer
- *
- * Pan (or wrap, depending on the `vmode' field) the display using the
- * `xoffset' and `yoffset' fields of the `var' structure.
- * If the values don't fit, return -EINVAL.
- *
- * Returns negative errno on error, or zero on success.
- */
-static int epson1355fb_pan_display(struct fb_var_screeninfo *var,
- struct fb_info *info)
-{
- struct epson1355_par *par = info->par;
- u32 start;
-
- if (var->xoffset != 0) /* not yet ... */
- return -EINVAL;
-
- if (var->yoffset + info->var.yres > info->var.yres_virtual)
- return -EINVAL;
-
- start = (info->fix.line_length >> 1) * var->yoffset;
-
- epson1355_write_reg20(par, start, REG_SCRN1_DISP_START_ADDR0);
-
- return 0;
-}
-
-/* ------------------------------------------------------------------------- */
-
-static void lcd_enable(struct epson1355_par *par, int enable)
-{
- u8 mode = epson1355_read_reg(par, REG_DISPLAY_MODE);
-
- if (enable)
- mode |= 1;
- else
- mode &= ~1;
-
- epson1355_write_reg(par, mode, REG_DISPLAY_MODE);
-}
-
-#if defined(CONFIG_ARCH_CEIVA)
-static void backlight_enable(int enable)
-{
- /* ### this should be protected by a spinlock ... */
- u8 pddr = clps_readb(PDDR);
- if (enable)
- pddr |= (1 << 5);
- else
- pddr &= ~(1 << 5);
- clps_writeb(pddr, PDDR);
-}
-#else
-static void backlight_enable(int enable)
-{
-}
-#endif
-
-
-/**
- * epson1355fb_blank - blanks the display.
- * @blank_mode: the blank mode we want.
- * @info: frame buffer structure that represents a single frame buffer
- *
- * Blank the screen if blank_mode != 0, else unblank. Return 0 if
- * blanking succeeded, != 0 if un-/blanking failed due to e.g. a
- * video mode which doesn't support it. Implements VESA suspend
- * and powerdown modes on hardware that supports disabling hsync/vsync:
- * blank_mode == 2: suspend vsync
- * blank_mode == 3: suspend hsync
- * blank_mode == 4: powerdown
- *
- * Returns negative errno on error, or zero on success.
- *
- */
-static int epson1355fb_blank(int blank_mode, struct fb_info *info)
-{
- struct epson1355_par *par = info->par;
-
- switch (blank_mode) {
- case FB_BLANK_UNBLANK:
- case FB_BLANK_NORMAL:
- lcd_enable(par, 1);
- backlight_enable(1);
- break;
- case FB_BLANK_VSYNC_SUSPEND:
- case FB_BLANK_HSYNC_SUSPEND:
- backlight_enable(0);
- break;
- case FB_BLANK_POWERDOWN:
- backlight_enable(0);
- lcd_enable(par, 0);
- break;
- default:
- return -EINVAL;
- }
-
- /* let fbcon do a soft blank for us */
- return (blank_mode == FB_BLANK_NORMAL) ? 1 : 0;
-}
-
-/* ------------------------------------------------------------------------- */
-
-/*
- * We can't use the cfb generic routines, as we have to limit
- * ourselves to 16-bit or 8-bit loads and stores to this 16-bit
- * chip.
- */
-
-static inline void epson1355fb_fb_writel(unsigned long v, unsigned long *a)
-{
- u16 *p = (u16 *) a;
- u16 l = v & 0xffff;
- u16 h = v >> 16;
-
- fb_writew(l, p);
- fb_writew(h, p + 1);
-}
-
-static inline unsigned long epson1355fb_fb_readl(const unsigned long *a)
-{
- const u16 *p = (u16 *) a;
- u16 l = fb_readw(p);
- u16 h = fb_readw(p + 1);
-
- return (h << 16) | l;
-}
-
-#define FB_READL epson1355fb_fb_readl
-#define FB_WRITEL epson1355fb_fb_writel
-
-/* ------------------------------------------------------------------------- */
-
-static inline unsigned long copy_from_user16(void *to, const void *from,
- unsigned long n)
-{
- u16 *dst = (u16 *) to;
- u16 *src = (u16 *) from;
-
- if (!access_ok(VERIFY_READ, from, n))
- return n;
-
- while (n > 1) {
- u16 v;
- if (__get_user(v, src))
- return n;
-
- fb_writew(v, dst);
-
- src++, dst++;
- n -= 2;
- }
-
- if (n) {
- u8 v;
-
- if (__get_user(v, ((u8 *) src)))
- return n;
-
- fb_writeb(v, dst);
- }
- return 0;
-}
-
-static inline unsigned long copy_to_user16(void *to, const void *from,
- unsigned long n)
-{
- u16 *dst = (u16 *) to;
- u16 *src = (u16 *) from;
-
- if (!access_ok(VERIFY_WRITE, to, n))
- return n;
-
- while (n > 1) {
- u16 v = fb_readw(src);
-
- if (__put_user(v, dst))
- return n;
-
- src++, dst++;
- n -= 2;
- }
-
- if (n) {
- u8 v = fb_readb(src);
-
- if (__put_user(v, ((u8 *) dst)))
- return n;
- }
- return 0;
-}
-
-
-static ssize_t
-epson1355fb_read(struct fb_info *info, char *buf, size_t count, loff_t * ppos)
-{
- unsigned long p = *ppos;
-
- if (p >= info->fix.smem_len)
- return 0;
- if (count >= info->fix.smem_len)
- count = info->fix.smem_len;
- if (count + p > info->fix.smem_len)
- count = info->fix.smem_len - p;
-
- if (count) {
- char *base_addr;
-
- base_addr = info->screen_base;
- count -= copy_to_user16(buf, base_addr + p, count);
- if (!count)
- return -EFAULT;
- *ppos += count;
- }
- return count;
-}
-
-static ssize_t
-epson1355fb_write(struct fb_info *info, const char *buf,
- size_t count, loff_t * ppos)
-{
- unsigned long p = *ppos;
- int err;
-
- /* from fbmem.c except for our own copy_*_user */
- if (p > info->fix.smem_len)
- return -ENOSPC;
- if (count >= info->fix.smem_len)
- count = info->fix.smem_len;
- err = 0;
- if (count + p > info->fix.smem_len) {
- count = info->fix.smem_len - p;
- err = -ENOSPC;
- }
-
- if (count) {
- char *base_addr;
-
- base_addr = info->screen_base;
- count -= copy_from_user16(base_addr + p, buf, count);
- *ppos += count;
- err = -EFAULT;
- }
- if (count)
- return count;
- return err;
-}
-
-/* ------------------------------------------------------------------------- */
-
-static struct fb_ops epson1355fb_fbops = {
- .owner = THIS_MODULE,
- .fb_setcolreg = epson1355fb_setcolreg,
- .fb_pan_display = epson1355fb_pan_display,
- .fb_blank = epson1355fb_blank,
- .fb_fillrect = cfb_fillrect,
- .fb_copyarea = cfb_copyarea,
- .fb_imageblit = cfb_imageblit,
- .fb_read = epson1355fb_read,
- .fb_write = epson1355fb_write,
-};
-
-/* ------------------------------------------------------------------------- */
-
-static __init unsigned int get_fb_size(struct fb_info *info)
-{
- unsigned int size = 2 * 1024 * 1024;
- char *p = info->screen_base;
-
- /* the 512k framebuffer is aliased at start + 0x80000 * n */
- fb_writeb(1, p);
- fb_writeb(0, p + 0x80000);
- if (!fb_readb(p))
- size = 512 * 1024;
-
- fb_writeb(0, p);
-
- return size;
-}
-
-static int epson1355_width_tab[2][4] __devinitdata =
- { {4, 8, 16, -1}, {9, 12, 16, -1} };
-static int epson1355_bpp_tab[8] __devinitdata = { 1, 2, 4, 8, 15, 16 };
-
-static void __devinit fetch_hw_state(struct fb_info *info, struct epson1355_par *par)
-{
- struct fb_var_screeninfo *var = &info->var;
- struct fb_fix_screeninfo *fix = &info->fix;
- u8 panel, display;
- u16 offset;
- u32 xres, yres;
- u32 xres_virtual, yres_virtual;
- int bpp, lcd_bpp;
- int is_color, is_dual, is_tft;
- int lcd_enabled, crt_enabled;
-
- fix->type = FB_TYPE_PACKED_PIXELS;
-
- display = epson1355_read_reg(par, REG_DISPLAY_MODE);
- bpp = epson1355_bpp_tab[(display >> 2) & 7];
-
- switch (bpp) {
- case 8:
- fix->visual = FB_VISUAL_PSEUDOCOLOR;
- var->bits_per_pixel = 8;
- var->red.offset = var->green.offset = var->blue.offset = 0;
- var->red.length = var->green.length = var->blue.length = 8;
- break;
- case 16:
- /* 5-6-5 RGB */
- fix->visual = FB_VISUAL_TRUECOLOR;
- var->bits_per_pixel = 16;
- var->red.offset = 11;
- var->red.length = 5;
- var->green.offset = 5;
- var->green.length = 6;
- var->blue.offset = 0;
- var->blue.length = 5;
- break;
- default:
- BUG();
- }
- fb_alloc_cmap(&(info->cmap), 256, 0);
-
- panel = epson1355_read_reg(par, REG_PANEL_TYPE);
- is_color = (panel & 0x04) != 0;
- is_dual = (panel & 0x02) != 0;
- is_tft = (panel & 0x01) != 0;
- crt_enabled = (display & 0x02) != 0;
- lcd_enabled = (display & 0x01) != 0;
- lcd_bpp = epson1355_width_tab[is_tft][(panel >> 4) & 3];
-
- xres = (epson1355_read_reg(par, REG_HORZ_DISP_WIDTH) + 1) * 8;
- yres = (epson1355_read_reg16(par, REG_VERT_DISP_HEIGHT0) + 1) *
- ((is_dual && !crt_enabled) ? 2 : 1);
- offset = epson1355_read_reg16(par, REG_MEM_ADDR_OFFSET0) & 0x7ff;
- xres_virtual = offset * 16 / bpp;
- yres_virtual = fix->smem_len / (offset * 2);
-
- var->xres = xres;
- var->yres = yres;
- var->xres_virtual = xres_virtual;
- var->yres_virtual = yres_virtual;
- var->xoffset = var->yoffset = 0;
-
- fix->line_length = offset * 2;
-
- fix->xpanstep = 0; /* no pan yet */
- fix->ypanstep = 1;
- fix->ywrapstep = 0;
- fix->accel = FB_ACCEL_NONE;
-
- var->grayscale = !is_color;
-
-#ifdef DEBUG
- printk(KERN_INFO
- "epson1355fb: xres=%d, yres=%d, "
- "is_color=%d, is_dual=%d, is_tft=%d\n",
- xres, yres, is_color, is_dual, is_tft);
- printk(KERN_INFO
- "epson1355fb: bpp=%d, lcd_bpp=%d, "
- "crt_enabled=%d, lcd_enabled=%d\n",
- bpp, lcd_bpp, crt_enabled, lcd_enabled);
-#endif
-}
-
-
-static void clearfb16(struct fb_info *info)
-{
- u16 *dst = (u16 *) info->screen_base;
- unsigned long n = info->fix.smem_len;
-
- while (n > 1) {
- fb_writew(0, dst);
- dst++, n -= 2;
- }
-
- if (n)
- fb_writeb(0, dst);
-}
-
-static int epson1355fb_remove(struct platform_device *dev)
-{
- struct fb_info *info = platform_get_drvdata(dev);
- struct epson1355_par *par = info->par;
-
- backlight_enable(0);
- if (par) {
- lcd_enable(par, 0);
- if (par && par->reg_addr)
- iounmap((void *) par->reg_addr);
- }
-
- if (info) {
- fb_dealloc_cmap(&info->cmap);
- if (info->screen_base)
- iounmap(info->screen_base);
- framebuffer_release(info);
- }
- release_mem_region(EPSON1355FB_FB_PHYS, EPSON1355FB_FB_LEN);
- release_mem_region(EPSON1355FB_REGS_PHYS, EPSON1355FB_REGS_LEN);
- return 0;
-}
-
-static int __devinit epson1355fb_probe(struct platform_device *dev)
-{
- struct epson1355_par *default_par;
- struct fb_info *info;
- u8 revision;
- int rc = 0;
-
- if (!request_mem_region(EPSON1355FB_REGS_PHYS, EPSON1355FB_REGS_LEN, "S1D13505 registers")) {
- printk(KERN_ERR "epson1355fb: unable to reserve "
- "registers at 0x%0x\n", EPSON1355FB_REGS_PHYS);
- rc = -EBUSY;
- goto bail;
- }
-
- if (!request_mem_region(EPSON1355FB_FB_PHYS, EPSON1355FB_FB_LEN,
- "S1D13505 framebuffer")) {
- printk(KERN_ERR "epson1355fb: unable to reserve "
- "framebuffer at 0x%0x\n", EPSON1355FB_FB_PHYS);
- rc = -EBUSY;
- goto bail;
- }
-
- info = framebuffer_alloc(sizeof(struct epson1355_par), &dev->dev);
- if (!info) {
- rc = -ENOMEM;
- goto bail;
- }
-
- default_par = info->par;
- default_par->reg_addr = (unsigned long) ioremap(EPSON1355FB_REGS_PHYS, EPSON1355FB_REGS_LEN);
- if (!default_par->reg_addr) {
- printk(KERN_ERR "epson1355fb: unable to map registers\n");
- rc = -ENOMEM;
- goto bail;
- }
- info->pseudo_palette = default_par->pseudo_palette;
-
- info->screen_base = ioremap(EPSON1355FB_FB_PHYS, EPSON1355FB_FB_LEN);
- if (!info->screen_base) {
- printk(KERN_ERR "epson1355fb: unable to map framebuffer\n");
- rc = -ENOMEM;
- goto bail;
- }
-
- revision = epson1355_read_reg(default_par, REG_REVISION_CODE);
- if ((revision >> 2) != 3) {
- printk(KERN_INFO "epson1355fb: epson1355 not found\n");
- rc = -ENODEV;
- goto bail;
- }
-
- info->fix.mmio_start = EPSON1355FB_REGS_PHYS;
- info->fix.mmio_len = EPSON1355FB_REGS_LEN;
- info->fix.smem_start = EPSON1355FB_FB_PHYS;
- info->fix.smem_len = get_fb_size(info);
-
- printk(KERN_INFO "epson1355fb: regs mapped at 0x%lx, fb %d KiB mapped at 0x%p\n",
- default_par->reg_addr, info->fix.smem_len / 1024, info->screen_base);
-
- strcpy(info->fix.id, "S1D13505");
- info->par = default_par;
- info->fbops = &epson1355fb_fbops;
- info->flags = FBINFO_DEFAULT | FBINFO_HWACCEL_YPAN;
-
- /* we expect the boot loader to have initialized the chip
- with appropriate parameters from which we can determinte
- the flavor of lcd panel attached */
- fetch_hw_state(info, default_par);
-
- /* turn this puppy on ... */
- clearfb16(info);
- backlight_enable(1);
- lcd_enable(default_par, 1);
-
- if (register_framebuffer(info) < 0) {
- rc = -EINVAL;
- goto bail;
- }
- /*
- * Our driver data.
- */
- platform_set_drvdata(dev, info);
-
- printk(KERN_INFO "fb%d: %s frame buffer device\n",
- info->node, info->fix.id);
-
- return 0;
-
- bail:
- epson1355fb_remove(dev);
- return rc;
-}
-
-static struct platform_driver epson1355fb_driver = {
- .probe = epson1355fb_probe,
- .remove = epson1355fb_remove,
- .driver = {
- .name = "epson1355fb",
- },
-};
-
-static struct platform_device *epson1355fb_device;
-
-int __init epson1355fb_init(void)
-{
- int ret = 0;
-
- if (fb_get_options("epson1355fb", NULL))
- return -ENODEV;
-
- ret = platform_driver_register(&epson1355fb_driver);
-
- if (!ret) {
- epson1355fb_device = platform_device_alloc("epson1355fb", 0);
-
- if (epson1355fb_device)
- ret = platform_device_add(epson1355fb_device);
- else
- ret = -ENOMEM;
-
- if (ret) {
- platform_device_put(epson1355fb_device);
- platform_driver_unregister(&epson1355fb_driver);
- }
- }
-
- return ret;
-}
-
-module_init(epson1355fb_init);
-
-#ifdef MODULE
-static void __exit epson1355fb_exit(void)
-{
- platform_device_unregister(epson1355fb_device);
- platform_driver_unregister(&epson1355fb_driver);
-}
-
-/* ------------------------------------------------------------------------- */
-
-module_exit(epson1355fb_exit);
-#endif
-
-MODULE_AUTHOR("Christopher Hoover <ch@hpl.hp.com>");
-MODULE_DESCRIPTION("Framebuffer driver for Epson S1D13505");
-MODULE_LICENSE("GPL");
projects / deliverable / linux.git / commitdiff
