--- /dev/null
+/*
+ * 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");
+
Code Review / kvmfornfv.git / blobdiff