linux/drivers/video/epson1355fb.c
Paul Mundt 1a3f28817e fb: epson1355fb: kill off dead sh support
The SH board that was the only user for this code was removed entirely from
the kernel quite some time ago, so there's no reason to leave the stubs in
place.  Additionally this driver was completely broken anyways, so there's
not really a lot of point in fixing it up either.

I can't imagine that this driver gets any testing on ARM either, given that
FB_BLANK_UNBLANKING doesn't exist, and kills the build regardless of which
platform is compiling.  This fixes that, too.

It wouldn't be a lot of work to finish the platform device conversion and
go with a generic 8-bit read/write_reg and kill off the architecture
dependence completely, should someone have any use for this driver.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Acked-by: Antonino Daplas <adaplas@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-07-17 10:23:13 -07:00

750 lines
18 KiB
C

/*
* 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://www.erd.epson.com/vdc/html/S1D13505.html
*
*
* 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/slab.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 <asm/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 <asm/arch/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] __initdata =
{ {4, 8, 16, -1}, {9, 12, 16, -1} };
static int epson1355_bpp_tab[8] __initdata = { 1, 2, 4, 8, 15, 16 };
static void __init 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;
}
int __init 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");