diff options
Diffstat (limited to 'drivers/video/arcfb.c')
-rw-r--r-- | drivers/video/arcfb.c | 667 |
1 files changed, 0 insertions, 667 deletions
diff --git a/drivers/video/arcfb.c b/drivers/video/arcfb.c deleted file mode 100644 index 1b0b233..0000000 --- a/drivers/video/arcfb.c +++ /dev/null @@ -1,667 +0,0 @@ -/* - * linux/drivers/video/arcfb.c -- FB driver for Arc monochrome LCD board - * - * Copyright (C) 2005, Jaya Kumar <jayalk@intworks.biz> - * - * 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. - * - * Layout is based on skeletonfb.c by James Simmons and Geert Uytterhoeven. - * - * This driver was written to be used with the Arc LCD board. Arc uses a - * set of KS108 chips that control individual 64x64 LCD matrices. The board - * can be paneled in a variety of setups such as 2x1=128x64, 4x4=256x256 and - * so on. The interface between the board and the host is TTL based GPIO. The - * GPIO requirements are 8 writable data lines and 4+n lines for control. On a - * GPIO-less system, the board can be tested by connecting the respective sigs - * up to a parallel port connector. The driver requires the IO addresses for - * data and control GPIO at load time. It is unable to probe for the - * existence of the LCD so it must be told at load time whether it should - * be enabled or not. - * - * Todo: - * - testing with 4x4 - * - testing with interrupt hw - * - * General notes: - * - User must set tuhold. It's in microseconds. According to the 108 spec, - * the hold time is supposed to be at least 1 microsecond. - * - User must set num_cols=x num_rows=y, eg: x=2 means 128 - * - User must set arcfb_enable=1 to enable it - * - User must set dio_addr=0xIOADDR cio_addr=0xIOADDR - * - */ - -#include <linux/module.h> -#include <linux/kernel.h> -#include <linux/errno.h> -#include <linux/string.h> -#include <linux/mm.h> -#include <linux/vmalloc.h> -#include <linux/delay.h> -#include <linux/interrupt.h> -#include <linux/fb.h> -#include <linux/init.h> -#include <linux/arcfb.h> -#include <linux/platform_device.h> - -#include <linux/uaccess.h> - -#define floor8(a) (a&(~0x07)) -#define floorXres(a,xres) (a&(~(xres - 1))) -#define iceil8(a) (((int)((a+7)/8))*8) -#define ceil64(a) (a|0x3F) -#define ceilXres(a,xres) (a|(xres - 1)) - -/* ks108 chipset specific defines and code */ - -#define KS_SET_DPY_START_LINE 0xC0 -#define KS_SET_PAGE_NUM 0xB8 -#define KS_SET_X 0x40 -#define KS_CEHI 0x01 -#define KS_CELO 0x00 -#define KS_SEL_CMD 0x08 -#define KS_SEL_DATA 0x00 -#define KS_DPY_ON 0x3F -#define KS_DPY_OFF 0x3E -#define KS_INTACK 0x40 -#define KS_CLRINT 0x02 - -struct arcfb_par { - unsigned long dio_addr; - unsigned long cio_addr; - unsigned long c2io_addr; - atomic_t ref_count; - unsigned char cslut[9]; - struct fb_info *info; - unsigned int irq; - spinlock_t lock; -}; - -static struct fb_fix_screeninfo arcfb_fix = { - .id = "arcfb", - .type = FB_TYPE_PACKED_PIXELS, - .visual = FB_VISUAL_MONO01, - .xpanstep = 0, - .ypanstep = 1, - .ywrapstep = 0, - .accel = FB_ACCEL_NONE, -}; - -static struct fb_var_screeninfo arcfb_var = { - .xres = 128, - .yres = 64, - .xres_virtual = 128, - .yres_virtual = 64, - .bits_per_pixel = 1, - .nonstd = 1, -}; - -static unsigned long num_cols; -static unsigned long num_rows; -static unsigned long dio_addr; -static unsigned long cio_addr; -static unsigned long c2io_addr; -static unsigned long splashval; -static unsigned long tuhold; -static unsigned int nosplash; -static unsigned int arcfb_enable; -static unsigned int irq; - -static DECLARE_WAIT_QUEUE_HEAD(arcfb_waitq); - -static void ks108_writeb_ctl(struct arcfb_par *par, - unsigned int chipindex, unsigned char value) -{ - unsigned char chipselval = par->cslut[chipindex]; - - outb(chipselval|KS_CEHI|KS_SEL_CMD, par->cio_addr); - outb(value, par->dio_addr); - udelay(tuhold); - outb(chipselval|KS_CELO|KS_SEL_CMD, par->cio_addr); -} - -static void ks108_writeb_mainctl(struct arcfb_par *par, unsigned char value) -{ - - outb(value, par->cio_addr); - udelay(tuhold); -} - -static unsigned char ks108_readb_ctl2(struct arcfb_par *par) -{ - return inb(par->c2io_addr); -} - -static void ks108_writeb_data(struct arcfb_par *par, - unsigned int chipindex, unsigned char value) -{ - unsigned char chipselval = par->cslut[chipindex]; - - outb(chipselval|KS_CEHI|KS_SEL_DATA, par->cio_addr); - outb(value, par->dio_addr); - udelay(tuhold); - outb(chipselval|KS_CELO|KS_SEL_DATA, par->cio_addr); -} - -static void ks108_set_start_line(struct arcfb_par *par, - unsigned int chipindex, unsigned char y) -{ - ks108_writeb_ctl(par, chipindex, KS_SET_DPY_START_LINE|y); -} - -static void ks108_set_yaddr(struct arcfb_par *par, - unsigned int chipindex, unsigned char y) -{ - ks108_writeb_ctl(par, chipindex, KS_SET_PAGE_NUM|y); -} - -static void ks108_set_xaddr(struct arcfb_par *par, - unsigned int chipindex, unsigned char x) -{ - ks108_writeb_ctl(par, chipindex, KS_SET_X|x); -} - -static void ks108_clear_lcd(struct arcfb_par *par, unsigned int chipindex) -{ - int i,j; - - for (i = 0; i <= 8; i++) { - ks108_set_yaddr(par, chipindex, i); - ks108_set_xaddr(par, chipindex, 0); - for (j = 0; j < 64; j++) { - ks108_writeb_data(par, chipindex, - (unsigned char) splashval); - } - } -} - -/* main arcfb functions */ - -static int arcfb_open(struct fb_info *info, int user) -{ - struct arcfb_par *par = info->par; - - atomic_inc(&par->ref_count); - return 0; -} - -static int arcfb_release(struct fb_info *info, int user) -{ - struct arcfb_par *par = info->par; - int count = atomic_read(&par->ref_count); - - if (!count) - return -EINVAL; - atomic_dec(&par->ref_count); - return 0; -} - -static int arcfb_pan_display(struct fb_var_screeninfo *var, - struct fb_info *info) -{ - int i; - struct arcfb_par *par = info->par; - - if ((var->vmode & FB_VMODE_YWRAP) && (var->yoffset < 64) - && (info->var.yres <= 64)) { - for (i = 0; i < num_cols; i++) { - ks108_set_start_line(par, i, var->yoffset); - } - info->var.yoffset = var->yoffset; - return 0; - } - - return -EINVAL; -} - -static irqreturn_t arcfb_interrupt(int vec, void *dev_instance) -{ - struct fb_info *info = dev_instance; - unsigned char ctl2status; - struct arcfb_par *par = info->par; - - ctl2status = ks108_readb_ctl2(par); - - if (!(ctl2status & KS_INTACK)) /* not arc generated interrupt */ - return IRQ_NONE; - - ks108_writeb_mainctl(par, KS_CLRINT); - - spin_lock(&par->lock); - if (waitqueue_active(&arcfb_waitq)) { - wake_up(&arcfb_waitq); - } - spin_unlock(&par->lock); - - return IRQ_HANDLED; -} - -/* - * here we handle a specific page on the lcd. the complexity comes from - * the fact that the fb is laidout in 8xX vertical columns. we extract - * each write of 8 vertical pixels. then we shift out as we move along - * X. That's what rightshift does. bitmask selects the desired input bit. - */ -static void arcfb_lcd_update_page(struct arcfb_par *par, unsigned int upper, - unsigned int left, unsigned int right, unsigned int distance) -{ - unsigned char *src; - unsigned int xindex, yindex, chipindex, linesize; - int i; - unsigned char val; - unsigned char bitmask, rightshift; - - xindex = left >> 6; - yindex = upper >> 6; - chipindex = (xindex + (yindex*num_cols)); - - ks108_set_yaddr(par, chipindex, upper/8); - - linesize = par->info->var.xres/8; - src = (unsigned char __force *) par->info->screen_base + (left/8) + - (upper * linesize); - ks108_set_xaddr(par, chipindex, left); - - bitmask=1; - rightshift=0; - while (left <= right) { - val = 0; - for (i = 0; i < 8; i++) { - if ( i > rightshift) { - val |= (*(src + (i*linesize)) & bitmask) - << (i - rightshift); - } else { - val |= (*(src + (i*linesize)) & bitmask) - >> (rightshift - i); - } - } - ks108_writeb_data(par, chipindex, val); - left++; - if (bitmask == 0x80) { - bitmask = 1; - src++; - rightshift=0; - } else { - bitmask <<= 1; - rightshift++; - } - } -} - -/* - * here we handle the entire vertical page of the update. we write across - * lcd chips. update_page uses the upper/left values to decide which - * chip to select for the right. upper is needed for setting the page - * desired for the write. - */ -static void arcfb_lcd_update_vert(struct arcfb_par *par, unsigned int top, - unsigned int bottom, unsigned int left, unsigned int right) -{ - unsigned int distance, upper, lower; - - distance = (bottom - top) + 1; - upper = top; - lower = top + 7; - - while (distance > 0) { - distance -= 8; - arcfb_lcd_update_page(par, upper, left, right, 8); - upper = lower + 1; - lower = upper + 7; - } -} - -/* - * here we handle horizontal blocks for the update. update_vert will - * handle spaning multiple pages. we break out each horizontal - * block in to individual blocks no taller than 64 pixels. - */ -static void arcfb_lcd_update_horiz(struct arcfb_par *par, unsigned int left, - unsigned int right, unsigned int top, unsigned int h) -{ - unsigned int distance, upper, lower; - - distance = h; - upper = floor8(top); - lower = min(upper + distance - 1, ceil64(upper)); - - while (distance > 0) { - distance -= ((lower - upper) + 1 ); - arcfb_lcd_update_vert(par, upper, lower, left, right); - upper = lower + 1; - lower = min(upper + distance - 1, ceil64(upper)); - } -} - -/* - * here we start the process of splitting out the fb update into - * individual blocks of pixels. we end up splitting into 64x64 blocks - * and finally down to 64x8 pages. - */ -static void arcfb_lcd_update(struct arcfb_par *par, unsigned int dx, - unsigned int dy, unsigned int w, unsigned int h) -{ - unsigned int left, right, distance, y; - - /* align the request first */ - y = floor8(dy); - h += dy - y; - h = iceil8(h); - - distance = w; - left = dx; - right = min(left + w - 1, ceil64(left)); - - while (distance > 0) { - arcfb_lcd_update_horiz(par, left, right, y, h); - distance -= ((right - left) + 1); - left = right + 1; - right = min(left + distance - 1, ceil64(left)); - } -} - -static void arcfb_fillrect(struct fb_info *info, - const struct fb_fillrect *rect) -{ - struct arcfb_par *par = info->par; - - sys_fillrect(info, rect); - - /* update the physical lcd */ - arcfb_lcd_update(par, rect->dx, rect->dy, rect->width, rect->height); -} - -static void arcfb_copyarea(struct fb_info *info, - const struct fb_copyarea *area) -{ - struct arcfb_par *par = info->par; - - sys_copyarea(info, area); - - /* update the physical lcd */ - arcfb_lcd_update(par, area->dx, area->dy, area->width, area->height); -} - -static void arcfb_imageblit(struct fb_info *info, const struct fb_image *image) -{ - struct arcfb_par *par = info->par; - - sys_imageblit(info, image); - - /* update the physical lcd */ - arcfb_lcd_update(par, image->dx, image->dy, image->width, - image->height); -} - -static int arcfb_ioctl(struct fb_info *info, - unsigned int cmd, unsigned long arg) -{ - void __user *argp = (void __user *)arg; - struct arcfb_par *par = info->par; - unsigned long flags; - - switch (cmd) { - case FBIO_WAITEVENT: - { - DEFINE_WAIT(wait); - /* illegal to wait on arc if no irq will occur */ - if (!par->irq) - return -EINVAL; - - /* wait until the Arc has generated an interrupt - * which will wake us up */ - spin_lock_irqsave(&par->lock, flags); - prepare_to_wait(&arcfb_waitq, &wait, - TASK_INTERRUPTIBLE); - spin_unlock_irqrestore(&par->lock, flags); - schedule(); - finish_wait(&arcfb_waitq, &wait); - } - case FBIO_GETCONTROL2: - { - unsigned char ctl2; - - ctl2 = ks108_readb_ctl2(info->par); - if (copy_to_user(argp, &ctl2, sizeof(ctl2))) - return -EFAULT; - return 0; - } - default: - return -EINVAL; - } -} - -/* - * this is the access path from userspace. they can seek and write to - * the fb. it's inefficient for them to do anything less than 64*8 - * writes since we update the lcd in each write() anyway. - */ -static ssize_t arcfb_write(struct fb_info *info, const char __user *buf, - size_t count, loff_t *ppos) -{ - /* modded from epson 1355 */ - - unsigned long p; - int err=-EINVAL; - unsigned int fbmemlength,x,y,w,h, bitppos, startpos, endpos, bitcount; - struct arcfb_par *par; - unsigned int xres; - - p = *ppos; - par = info->par; - xres = info->var.xres; - fbmemlength = (xres * info->var.yres)/8; - - if (p > fbmemlength) - return -ENOSPC; - - err = 0; - if ((count + p) > fbmemlength) { - count = fbmemlength - p; - err = -ENOSPC; - } - - if (count) { - char *base_addr; - - base_addr = (char __force *)info->screen_base; - count -= copy_from_user(base_addr + p, buf, count); - *ppos += count; - err = -EFAULT; - } - - - bitppos = p*8; - startpos = floorXres(bitppos, xres); - endpos = ceilXres((bitppos + (count*8)), xres); - bitcount = endpos - startpos; - - x = startpos % xres; - y = startpos / xres; - w = xres; - h = bitcount / xres; - arcfb_lcd_update(par, x, y, w, h); - - if (count) - return count; - return err; -} - -static struct fb_ops arcfb_ops = { - .owner = THIS_MODULE, - .fb_open = arcfb_open, - .fb_read = fb_sys_read, - .fb_write = arcfb_write, - .fb_release = arcfb_release, - .fb_pan_display = arcfb_pan_display, - .fb_fillrect = arcfb_fillrect, - .fb_copyarea = arcfb_copyarea, - .fb_imageblit = arcfb_imageblit, - .fb_ioctl = arcfb_ioctl, -}; - -static int arcfb_probe(struct platform_device *dev) -{ - struct fb_info *info; - int retval = -ENOMEM; - int videomemorysize; - unsigned char *videomemory; - struct arcfb_par *par; - int i; - - videomemorysize = (((64*64)*num_cols)*num_rows)/8; - - /* We need a flat backing store for the Arc's - less-flat actual paged framebuffer */ - videomemory = vzalloc(videomemorysize); - if (!videomemory) - return retval; - - info = framebuffer_alloc(sizeof(struct arcfb_par), &dev->dev); - if (!info) - goto err; - - info->screen_base = (char __iomem *)videomemory; - info->fbops = &arcfb_ops; - - info->var = arcfb_var; - info->fix = arcfb_fix; - par = info->par; - par->info = info; - - if (!dio_addr || !cio_addr || !c2io_addr) { - printk(KERN_WARNING "no IO addresses supplied\n"); - goto err1; - } - par->dio_addr = dio_addr; - par->cio_addr = cio_addr; - par->c2io_addr = c2io_addr; - par->cslut[0] = 0x00; - par->cslut[1] = 0x06; - info->flags = FBINFO_FLAG_DEFAULT; - spin_lock_init(&par->lock); - retval = register_framebuffer(info); - if (retval < 0) - goto err1; - platform_set_drvdata(dev, info); - if (irq) { - par->irq = irq; - if (request_irq(par->irq, &arcfb_interrupt, IRQF_SHARED, - "arcfb", info)) { - printk(KERN_INFO - "arcfb: Failed req IRQ %d\n", par->irq); - retval = -EBUSY; - goto err1; - } - } - fb_info(info, "Arc frame buffer device, using %dK of video memory\n", - videomemorysize >> 10); - - /* this inits the lcd but doesn't clear dirty pixels */ - for (i = 0; i < num_cols * num_rows; i++) { - ks108_writeb_ctl(par, i, KS_DPY_OFF); - ks108_set_start_line(par, i, 0); - ks108_set_yaddr(par, i, 0); - ks108_set_xaddr(par, i, 0); - ks108_writeb_ctl(par, i, KS_DPY_ON); - } - - /* if we were told to splash the screen, we just clear it */ - if (!nosplash) { - for (i = 0; i < num_cols * num_rows; i++) { - fb_info(info, "splashing lcd %d\n", i); - ks108_set_start_line(par, i, 0); - ks108_clear_lcd(par, i); - } - } - - return 0; -err1: - framebuffer_release(info); -err: - vfree(videomemory); - return retval; -} - -static int arcfb_remove(struct platform_device *dev) -{ - struct fb_info *info = platform_get_drvdata(dev); - - if (info) { - unregister_framebuffer(info); - vfree((void __force *)info->screen_base); - framebuffer_release(info); - } - return 0; -} - -static struct platform_driver arcfb_driver = { - .probe = arcfb_probe, - .remove = arcfb_remove, - .driver = { - .name = "arcfb", - }, -}; - -static struct platform_device *arcfb_device; - -static int __init arcfb_init(void) -{ - int ret; - - if (!arcfb_enable) - return -ENXIO; - - ret = platform_driver_register(&arcfb_driver); - if (!ret) { - arcfb_device = platform_device_alloc("arcfb", 0); - if (arcfb_device) { - ret = platform_device_add(arcfb_device); - } else { - ret = -ENOMEM; - } - if (ret) { - platform_device_put(arcfb_device); - platform_driver_unregister(&arcfb_driver); - } - } - return ret; - -} - -static void __exit arcfb_exit(void) -{ - platform_device_unregister(arcfb_device); - platform_driver_unregister(&arcfb_driver); -} - -module_param(num_cols, ulong, 0); -MODULE_PARM_DESC(num_cols, "Num horiz panels, eg: 2 = 128 bit wide"); -module_param(num_rows, ulong, 0); -MODULE_PARM_DESC(num_rows, "Num vert panels, eg: 1 = 64 bit high"); -module_param(nosplash, uint, 0); -MODULE_PARM_DESC(nosplash, "Disable doing the splash screen"); -module_param(arcfb_enable, uint, 0); -MODULE_PARM_DESC(arcfb_enable, "Enable communication with Arc board"); -module_param(dio_addr, ulong, 0); -MODULE_PARM_DESC(dio_addr, "IO address for data, eg: 0x480"); -module_param(cio_addr, ulong, 0); -MODULE_PARM_DESC(cio_addr, "IO address for control, eg: 0x400"); -module_param(c2io_addr, ulong, 0); -MODULE_PARM_DESC(c2io_addr, "IO address for secondary control, eg: 0x408"); -module_param(splashval, ulong, 0); -MODULE_PARM_DESC(splashval, "Splash pattern: 0xFF is black, 0x00 is green"); -module_param(tuhold, ulong, 0); -MODULE_PARM_DESC(tuhold, "Time to hold between strobing data to Arc board"); -module_param(irq, uint, 0); -MODULE_PARM_DESC(irq, "IRQ for the Arc board"); - -module_init(arcfb_init); -module_exit(arcfb_exit); - -MODULE_DESCRIPTION("fbdev driver for Arc monochrome LCD board"); -MODULE_AUTHOR("Jaya Kumar"); -MODULE_LICENSE("GPL"); - |