776 lines
19 KiB
C
776 lines
19 KiB
C
/*
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* linux/drivers/video/epson1355fb.c -- Epson S1D13505 frame buffer for 2.5.
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*
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* Epson Research S1D13505 Embedded RAMDAC LCD/CRT Controller
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* (previously known as SED1355)
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*
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* Cf. http://www.erd.epson.com/vdc/html/S1D13505.html
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*
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*
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* Copyright (C) Hewlett-Packard Company. All rights reserved.
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*
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* Written by Christopher Hoover <ch@hpl.hp.com>
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*
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* Adapted from:
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*
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* linux/drivers/video/skeletonfb.c
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* Modified to new api Jan 2001 by James Simmons (jsimmons@infradead.org)
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* Created 28 Dec 1997 by Geert Uytterhoeven
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*
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* linux/drivers/video/epson1355fb.c (2.4 driver)
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* Copyright (C) 2000 Philipp Rumpf <prumpf@tux.org>
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file COPYING in the main directory of this archive for
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* more details.
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*
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*
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* Noteworthy Issues
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* -----------------
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*
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* This driver is complicated by the fact that this is a 16-bit chip
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* and, on at least one platform (ceiva), we can only do 16-bit reads
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* and writes to the framebuffer. We hide this from user space
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* except in the case of mmap().
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*
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*
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* To Do
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* -----
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*
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* - Test 8-bit pseudocolor mode
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* - Allow setting bpp, virtual resolution
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* - Implement horizontal panning
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* - (maybe) Implement hardware cursor
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/string.h>
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#include <linux/mm.h>
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#include <linux/tty.h>
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#include <linux/slab.h>
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#include <linux/delay.h>
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#include <linux/fb.h>
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#include <linux/init.h>
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#include <linux/ioport.h>
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#include <linux/platform_device.h>
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#include <asm/types.h>
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#include <asm/io.h>
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#include <asm/uaccess.h>
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#include <video/epson1355.h>
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struct epson1355_par {
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unsigned long reg_addr;
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};
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/* ------------------------------------------------------------------------- */
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#ifdef CONFIG_SUPERH
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static inline u8 epson1355_read_reg(int index)
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{
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return ctrl_inb(par.reg_addr + index);
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}
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static inline void epson1355_write_reg(u8 data, int index)
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{
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ctrl_outb(data, par.reg_addr + index);
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}
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#elif defined(CONFIG_ARM)
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# ifdef CONFIG_ARCH_CEIVA
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# include <asm/arch/hardware.h>
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# define EPSON1355FB_BASE_PHYS (CEIVA_PHYS_SED1355)
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# endif
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static inline u8 epson1355_read_reg(struct epson1355_par *par, int index)
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{
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return __raw_readb(par->reg_addr + index);
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}
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static inline void epson1355_write_reg(struct epson1355_par *par, u8 data, int index)
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{
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__raw_writeb(data, par->reg_addr + index);
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}
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#else
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# error "no architecture-specific epson1355_{read,write}_reg"
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#endif
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#ifndef EPSON1355FB_BASE_PHYS
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# error "EPSON1355FB_BASE_PHYS is not defined"
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#endif
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#define EPSON1355FB_REGS_OFS (0)
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#define EPSON1355FB_REGS_PHYS (EPSON1355FB_BASE_PHYS + EPSON1355FB_REGS_OFS)
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#define EPSON1355FB_REGS_LEN (64)
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#define EPSON1355FB_FB_OFS (0x00200000)
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#define EPSON1355FB_FB_PHYS (EPSON1355FB_BASE_PHYS + EPSON1355FB_FB_OFS)
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#define EPSON1355FB_FB_LEN (2 * 1024 * 1024)
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/* ------------------------------------------------------------------------- */
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static inline u16 epson1355_read_reg16(struct epson1355_par *par, int index)
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{
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u8 lo = epson1355_read_reg(par, index);
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u8 hi = epson1355_read_reg(par, index + 1);
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return (hi << 8) | lo;
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}
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static inline void epson1355_write_reg16(struct epson1355_par *par, u16 data, int index)
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{
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u8 lo = data & 0xff;
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u8 hi = (data >> 8) & 0xff;
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epson1355_write_reg(par, lo, index);
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epson1355_write_reg(par, hi, index + 1);
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}
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static inline u32 epson1355_read_reg20(struct epson1355_par *par, int index)
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{
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u8 b0 = epson1355_read_reg(par, index);
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u8 b1 = epson1355_read_reg(par, index + 1);
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u8 b2 = epson1355_read_reg(par, index + 2);
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return (b2 & 0x0f) << 16 | (b1 << 8) | b0;
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}
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static inline void epson1355_write_reg20(struct epson1355_par *par, u32 data, int index)
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{
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u8 b0 = data & 0xff;
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u8 b1 = (data >> 8) & 0xff;
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u8 b2 = (data >> 16) & 0x0f;
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epson1355_write_reg(par, b0, index);
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epson1355_write_reg(par, b1, index + 1);
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epson1355_write_reg(par, b2, index + 2);
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}
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/* ------------------------------------------------------------------------- */
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static void set_lut(struct epson1355_par *par, u8 index, u8 r, u8 g, u8 b)
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{
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epson1355_write_reg(par, index, REG_LUT_ADDR);
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epson1355_write_reg(par, r, REG_LUT_DATA);
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epson1355_write_reg(par, g, REG_LUT_DATA);
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epson1355_write_reg(par, b, REG_LUT_DATA);
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}
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/**
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* epson1355fb_setcolreg - sets a color register.
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* @regno: Which register in the CLUT we are programming
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* @red: The red value which can be up to 16 bits wide
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* @green: The green value which can be up to 16 bits wide
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* @blue: The blue value which can be up to 16 bits wide.
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* @transp: If supported the alpha value which can be up to 16 bits wide.
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* @info: frame buffer info structure
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*
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* Returns negative errno on error, or zero on success.
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*/
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static int epson1355fb_setcolreg(unsigned regno, unsigned r, unsigned g,
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unsigned b, unsigned transp,
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struct fb_info *info)
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{
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struct epson1355_par *par = info->par;
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if (info->var.grayscale)
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r = g = b = (19595 * r + 38470 * g + 7471 * b) >> 16;
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switch (info->fix.visual) {
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case FB_VISUAL_TRUECOLOR:
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if (regno >= 16)
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return -EINVAL;
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((u32 *) info->pseudo_palette)[regno] =
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(r & 0xf800) | (g & 0xfc00) >> 5 | (b & 0xf800) >> 11;
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break;
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case FB_VISUAL_PSEUDOCOLOR:
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if (regno >= 256)
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return -EINVAL;
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set_lut(par, regno, r >> 8, g >> 8, b >> 8);
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break;
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default:
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return -ENOSYS;
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}
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return 0;
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}
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/* ------------------------------------------------------------------------- */
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/**
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* epson1355fb_pan_display - Pans the display.
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* @var: frame buffer variable screen structure
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* @info: frame buffer structure that represents a single frame buffer
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*
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* Pan (or wrap, depending on the `vmode' field) the display using the
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* `xoffset' and `yoffset' fields of the `var' structure.
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* If the values don't fit, return -EINVAL.
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*
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* Returns negative errno on error, or zero on success.
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*/
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static int epson1355fb_pan_display(struct fb_var_screeninfo *var,
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struct fb_info *info)
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{
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struct epson1355_par *par = info->par;
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u32 start;
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if (var->xoffset != 0) /* not yet ... */
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return -EINVAL;
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if (var->yoffset + info->var.yres > info->var.yres_virtual)
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return -EINVAL;
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start = (info->fix.line_length >> 1) * var->yoffset;
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epson1355_write_reg20(par, start, REG_SCRN1_DISP_START_ADDR0);
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return 0;
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}
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/* ------------------------------------------------------------------------- */
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static void lcd_enable(struct epson1355_par *par, int enable)
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{
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u8 mode = epson1355_read_reg(par, REG_DISPLAY_MODE);
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if (enable)
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mode |= 1;
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else
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mode &= ~1;
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epson1355_write_reg(par, mode, REG_DISPLAY_MODE);
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}
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#if defined(CONFIG_ARCH_CEIVA)
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static void backlight_enable(int enable)
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{
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/* ### this should be protected by a spinlock ... */
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u8 pddr = clps_readb(PDDR);
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if (enable)
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pddr |= (1 << 5);
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else
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pddr &= ~(1 << 5);
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clps_writeb(pddr, PDDR);
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}
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#else
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static void backlight_enable(int enable)
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{
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}
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#endif
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/**
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* epson1355fb_blank - blanks the display.
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* @blank_mode: the blank mode we want.
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* @info: frame buffer structure that represents a single frame buffer
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*
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* Blank the screen if blank_mode != 0, else unblank. Return 0 if
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* blanking succeeded, != 0 if un-/blanking failed due to e.g. a
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* video mode which doesn't support it. Implements VESA suspend
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* and powerdown modes on hardware that supports disabling hsync/vsync:
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* blank_mode == 2: suspend vsync
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* blank_mode == 3: suspend hsync
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* blank_mode == 4: powerdown
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*
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* Returns negative errno on error, or zero on success.
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*
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*/
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static int epson1355fb_blank(int blank_mode, struct fb_info *info)
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{
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struct epson1355_par *par = info->par;
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switch (blank_mode) {
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case FB_BLANK_UNBLANKING:
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case FB_BLANK_NORMAL:
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lcd_enable(par, 1);
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backlight_enable(1);
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break;
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case FB_BLANK_VSYNC_SUSPEND:
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case FB_BLANK_HSYNC_SUSPEND:
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backlight_enable(0);
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break;
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case FB_BLANK_POWERDOWN:
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backlight_enable(0);
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lcd_enable(par, 0);
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break;
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default:
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return -EINVAL;
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}
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/* let fbcon do a soft blank for us */
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return (blank_mode == FB_BLANK_NORMAL) ? 1 : 0;
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}
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/* ------------------------------------------------------------------------- */
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/*
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* We can't use the cfb generic routines, as we have to limit
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* ourselves to 16-bit or 8-bit loads and stores to this 16-bit
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* chip.
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*/
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static inline void epson1355fb_fb_writel(unsigned long v, unsigned long *a)
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{
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u16 *p = (u16 *) a;
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u16 l = v & 0xffff;
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u16 h = v >> 16;
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fb_writew(l, p);
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fb_writew(h, p + 1);
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}
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static inline unsigned long epson1355fb_fb_readl(const unsigned long *a)
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{
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const u16 *p = (u16 *) a;
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u16 l = fb_readw(p);
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u16 h = fb_readw(p + 1);
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return (h << 16) | l;
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}
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#define FB_READL epson1355fb_fb_readl
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#define FB_WRITEL epson1355fb_fb_writel
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/* ------------------------------------------------------------------------- */
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static inline unsigned long copy_from_user16(void *to, const void *from,
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unsigned long n)
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{
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u16 *dst = (u16 *) to;
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u16 *src = (u16 *) from;
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if (!access_ok(VERIFY_READ, from, n))
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return n;
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while (n > 1) {
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u16 v;
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if (__get_user(v, src))
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return n;
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fb_writew(v, dst);
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src++, dst++;
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n -= 2;
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}
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if (n) {
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u8 v;
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if (__get_user(v, ((u8 *) src)))
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return n;
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fb_writeb(v, dst);
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}
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return 0;
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}
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static inline unsigned long copy_to_user16(void *to, const void *from,
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unsigned long n)
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{
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u16 *dst = (u16 *) to;
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u16 *src = (u16 *) from;
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if (!access_ok(VERIFY_WRITE, to, n))
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return n;
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while (n > 1) {
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u16 v = fb_readw(src);
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if (__put_user(v, dst))
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return n;
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src++, dst++;
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n -= 2;
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}
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if (n) {
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u8 v = fb_readb(src);
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if (__put_user(v, ((u8 *) dst)))
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return n;
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}
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return 0;
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}
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static ssize_t
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epson1355fb_read(struct file *file, char *buf, size_t count, loff_t * ppos)
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{
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struct inode *inode = file->f_dentry->d_inode;
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int fbidx = iminor(inode);
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struct fb_info *info = registered_fb[fbidx];
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unsigned long p = *ppos;
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/* from fbmem.c except for our own copy_*_user */
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if (!info || !info->screen_base)
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return -ENODEV;
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if (p >= info->fix.smem_len)
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return 0;
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if (count >= info->fix.smem_len)
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count = info->fix.smem_len;
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if (count + p > info->fix.smem_len)
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count = info->fix.smem_len - p;
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if (count) {
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char *base_addr;
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base_addr = info->screen_base;
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count -= copy_to_user16(buf, base_addr + p, count);
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if (!count)
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return -EFAULT;
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*ppos += count;
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}
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return count;
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}
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static ssize_t
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epson1355fb_write(struct file *file, const char *buf,
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size_t count, loff_t * ppos)
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{
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struct inode *inode = file->f_dentry->d_inode;
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int fbidx = iminor(inode);
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struct fb_info *info = registered_fb[fbidx];
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unsigned long p = *ppos;
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int err;
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/* from fbmem.c except for our own copy_*_user */
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if (!info || !info->screen_base)
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return -ENODEV;
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/* from fbmem.c except for our own copy_*_user */
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if (p > info->fix.smem_len)
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return -ENOSPC;
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if (count >= info->fix.smem_len)
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count = info->fix.smem_len;
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err = 0;
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if (count + p > info->fix.smem_len) {
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count = info->fix.smem_len - p;
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err = -ENOSPC;
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}
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if (count) {
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char *base_addr;
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base_addr = info->screen_base;
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count -= copy_from_user16(base_addr + p, buf, count);
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*ppos += count;
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err = -EFAULT;
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}
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if (count)
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return count;
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return err;
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}
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/* ------------------------------------------------------------------------- */
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static struct fb_ops epson1355fb_fbops = {
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.owner = THIS_MODULE,
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.fb_setcolreg = epson1355fb_setcolreg,
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.fb_pan_display = epson1355fb_pan_display,
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.fb_blank = epson1355fb_blank,
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.fb_fillrect = cfb_fillrect,
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.fb_copyarea = cfb_copyarea,
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.fb_imageblit = cfb_imageblit,
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.fb_read = epson1355fb_read,
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.fb_write = epson1355fb_write,
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};
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/* ------------------------------------------------------------------------- */
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static __init unsigned int get_fb_size(struct fb_info *info)
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{
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unsigned int size = 2 * 1024 * 1024;
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char *p = info->screen_base;
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/* the 512k framebuffer is aliased at start + 0x80000 * n */
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fb_writeb(1, p);
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fb_writeb(0, p + 0x80000);
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if (!fb_readb(p))
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size = 512 * 1024;
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fb_writeb(0, p);
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return size;
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}
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static int epson1355_width_tab[2][4] __initdata =
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{ {4, 8, 16, -1}, {9, 12, 16, -1} };
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static int epson1355_bpp_tab[8] __initdata = { 1, 2, 4, 8, 15, 16 };
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static void __init fetch_hw_state(struct fb_info *info, struct epson1355_par *par)
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{
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struct fb_var_screeninfo *var = &info->var;
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struct fb_fix_screeninfo *fix = &info->fix;
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u8 panel, display;
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u16 offset;
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u32 xres, yres;
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u32 xres_virtual, yres_virtual;
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int bpp, lcd_bpp;
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int is_color, is_dual, is_tft;
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int lcd_enabled, crt_enabled;
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fix->type = FB_TYPE_PACKED_PIXELS;
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display = epson1355_read_reg(par, REG_DISPLAY_MODE);
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bpp = epson1355_bpp_tab[(display >> 2) & 7];
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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 void epson1355fb_platform_release(struct device *device)
|
|
{
|
|
dev_err(device, "This driver is broken, please bug the authors so they will fix it.\n");
|
|
}
|
|
|
|
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) + sizeof(u32) * 256, &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 = (void *)(default_par + 1);
|
|
|
|
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 = {
|
|
.name = "epson1355fb",
|
|
.id = 0,
|
|
.dev = {
|
|
.release = epson1355fb_platform_release,
|
|
}
|
|
};
|
|
|
|
int __init epson1355fb_init(void)
|
|
{
|
|
int ret = 0;
|
|
|
|
if (fb_get_options("epson1355fb", NULL))
|
|
return -ENODEV;
|
|
|
|
ret = platform_driver_register(&epson1355fb_driver);
|
|
if (!ret) {
|
|
ret = platform_device_register(&epson1355fb_device);
|
|
if (ret)
|
|
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");
|