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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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#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/io.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 const 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 const 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 *)par->info->screen_buffer + (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 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); } fallthrough;
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; }}
static void arcfb_damage_range(struct fb_info *info, off_t off, size_t len){ struct arcfb_par *par = info->par; unsigned int xres = info->var.xres; unsigned int bitppos, startpos, endpos, bitcount; unsigned int x, y, width, height;
bitppos = off * 8; startpos = floorXres(bitppos, xres); endpos = ceilXres((bitppos + (len * 8)), xres); bitcount = endpos - startpos;
x = startpos % xres; y = startpos / xres; width = xres; height = bitcount / xres;
arcfb_lcd_update(par, x, y, width, height);}
static void arcfb_damage_area(struct fb_info *info, u32 x, u32 y, u32 width, u32 height){ struct arcfb_par *par = info->par;
/* update the physical lcd */ arcfb_lcd_update(par, x, y, width, height);}
FB_GEN_DEFAULT_DEFERRED_SYSMEM_OPS(arcfb, arcfb_damage_range, arcfb_damage_area)
static const struct fb_ops arcfb_ops = { .owner = THIS_MODULE, .fb_open = arcfb_open, __FB_DEFAULT_DEFERRED_OPS_RDWR(arcfb), .fb_release = arcfb_release, .fb_pan_display = arcfb_pan_display, __FB_DEFAULT_DEFERRED_OPS_DRAW(arcfb), .fb_ioctl = arcfb_ioctl, // .fb_mmap reqires deferred I/O};
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_fb_alloc;
info->flags |= FBINFO_VIRTFB; info->screen_buffer = 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 err_addr; } par->dio_addr = dio_addr; par->cio_addr = cio_addr; par->c2io_addr = c2io_addr; par->cslut[0] = 0x00; par->cslut[1] = 0x06; spin_lock_init(&par->lock); 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 err_addr; } } retval = register_framebuffer(info); if (retval < 0) goto err_register_fb; platform_set_drvdata(dev, info); 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;
err_register_fb: free_irq(par->irq, info);err_addr: framebuffer_release(info);err_fb_alloc: vfree(videomemory); return retval;}
static void arcfb_remove(struct platform_device *dev){ struct fb_info *info = platform_get_drvdata(dev);
if (info) { unregister_framebuffer(info); if (irq) free_irq(((struct arcfb_par *)(info->par))->irq, info); vfree(info->screen_buffer); framebuffer_release(info); }}
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_hw(dio_addr, ulong, ioport, 0);MODULE_PARM_DESC(dio_addr, "IO address for data, eg: 0x480");module_param_hw(cio_addr, ulong, ioport, 0);MODULE_PARM_DESC(cio_addr, "IO address for control, eg: 0x400");module_param_hw(c2io_addr, ulong, ioport, 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_hw(irq, uint, irq, 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");