/* * 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 <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 <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");