diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/video/Kconfig | 14 | ||||
| -rw-r--r-- | drivers/video/Makefile | 1 | ||||
| -rw-r--r-- | drivers/video/hecubafb.c | 480 |
3 files changed, 495 insertions, 0 deletions
diff --git a/drivers/video/Kconfig b/drivers/video/Kconfig index 61c0a03d33f..0aeab4e725a 100644 --- a/drivers/video/Kconfig +++ b/drivers/video/Kconfig @@ -557,6 +557,20 @@ config FB_IMAC help This is the frame buffer device driver for the Intel-based Macintosh +config FB_HECUBA + tristate "Hecuba board support" + depends on FB && X86 && MMU + select FB_CFB_FILLRECT + select FB_CFB_COPYAREA + select FB_CFB_IMAGEBLIT + select FB_DEFERRED_IO + help + This enables support for the Hecuba board. This driver was tested + with an E-Ink 800x600 display and x86 SBCs through a 16 bit GPIO + interface (8 bit data, 4 bit control). If you anticpate using + this driver, say Y or M; otherwise say N. You must specify the + GPIO IO address to be used for setting control and data. + config FB_HGA tristate "Hercules mono graphics support" depends on FB && X86 diff --git a/drivers/video/Makefile b/drivers/video/Makefile index deb5fa55f78..49d01eb48c7 100644 --- a/drivers/video/Makefile +++ b/drivers/video/Makefile @@ -67,6 +67,7 @@ obj-$(CONFIG_FB_ACORN) += acornfb.o obj-$(CONFIG_FB_ATARI) += atafb.o c2p.o atafb_mfb.o \ atafb_iplan2p2.o atafb_iplan2p4.o atafb_iplan2p8.o obj-$(CONFIG_FB_MAC) += macfb.o +obj-$(CONFIG_FB_HECUBA) += hecubafb.o obj-$(CONFIG_FB_HGA) += hgafb.o obj-$(CONFIG_FB_XVR500) += sunxvr500.o obj-$(CONFIG_FB_XVR2500) += sunxvr2500.o diff --git a/drivers/video/hecubafb.c b/drivers/video/hecubafb.c new file mode 100644 index 00000000000..396dc277ab5 --- /dev/null +++ b/drivers/video/hecubafb.c @@ -0,0 +1,480 @@ +/* + * linux/drivers/video/hecubafb.c -- FB driver for Hecuba controller + * + * Copyright (C) 2006, Jaya Kumar + * This work was sponsored by CIS(M) Sdn Bhd + * + * 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 work was possible because of apollo display code from E-Ink's website + * http://support.eink.com/community + * All information used to write this code is from public material made + * available by E-Ink on its support site. Some commands such as 0xA4 + * were found by looping through cmd=0x00 thru 0xFF and supplying random + * values. There are other commands that the display is capable of, + * beyond the 5 used here but they are more complex. + * + * This driver is written to be used with the Hecuba display controller + * board, and tested with the EInk 800x600 display in 1 bit mode. + * The interface between Hecuba and the host is TTL based GPIO. The + * GPIO requirements are 8 writable data lines and 6 lines for control. + * Only 4 of the controls are actually used here but 6 for future use. + * The driver requires the IO addresses for data and control GPIO at + * load time. It is also possible to use this display with a standard + * PC parallel port. + * + * General notes: + * - User must set hecubafb_enable=1 to enable it + * - User must set dio_addr=0xIOADDR cio_addr=0xIOADDR c2io_addr=0xIOADDR + * + */ + +#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/vmalloc.h> +#include <linux/delay.h> +#include <linux/interrupt.h> +#include <linux/fb.h> +#include <linux/init.h> +#include <linux/platform_device.h> +#include <linux/list.h> +#include <asm/uaccess.h> + +/* Apollo controller specific defines */ +#define APOLLO_START_NEW_IMG 0xA0 +#define APOLLO_STOP_IMG_DATA 0xA1 +#define APOLLO_DISPLAY_IMG 0xA2 +#define APOLLO_ERASE_DISPLAY 0xA3 +#define APOLLO_INIT_DISPLAY 0xA4 + +/* Hecuba interface specific defines */ +/* WUP is inverted, CD is inverted, DS is inverted */ +#define HCB_NWUP_BIT 0x01 +#define HCB_NDS_BIT 0x02 +#define HCB_RW_BIT 0x04 +#define HCB_NCD_BIT 0x08 +#define HCB_ACK_BIT 0x80 + +/* Display specific information */ +#define DPY_W 600 +#define DPY_H 800 + +struct hecubafb_par { + unsigned long dio_addr; + unsigned long cio_addr; + unsigned long c2io_addr; + unsigned char ctl; + struct fb_info *info; + unsigned int irq; +}; + +static struct fb_fix_screeninfo hecubafb_fix __devinitdata = { + .id = "hecubafb", + .type = FB_TYPE_PACKED_PIXELS, + .visual = FB_VISUAL_MONO01, + .xpanstep = 0, + .ypanstep = 0, + .ywrapstep = 0, + .accel = FB_ACCEL_NONE, +}; + +static struct fb_var_screeninfo hecubafb_var __devinitdata = { + .xres = DPY_W, + .yres = DPY_H, + .xres_virtual = DPY_W, + .yres_virtual = DPY_H, + .bits_per_pixel = 1, + .nonstd = 1, +}; + +static unsigned long dio_addr; +static unsigned long cio_addr; +static unsigned long c2io_addr; +static unsigned long splashval; +static unsigned int nosplash; +static unsigned int hecubafb_enable; +static unsigned int irq; + +static DECLARE_WAIT_QUEUE_HEAD(hecubafb_waitq); + +static void hcb_set_ctl(struct hecubafb_par *par) +{ + outb(par->ctl, par->cio_addr); +} + +static unsigned char hcb_get_ctl(struct hecubafb_par *par) +{ + return inb(par->c2io_addr); +} + +static void hcb_set_data(struct hecubafb_par *par, unsigned char value) +{ + outb(value, par->dio_addr); +} + +static int __devinit apollo_init_control(struct hecubafb_par *par) +{ + unsigned char ctl; + /* for init, we want the following setup to be set: + WUP = lo + ACK = hi + DS = hi + RW = hi + CD = lo + */ + + /* write WUP to lo, DS to hi, RW to hi, CD to lo */ + par->ctl = HCB_NWUP_BIT | HCB_RW_BIT | HCB_NCD_BIT ; + par->ctl &= ~HCB_NDS_BIT; + hcb_set_ctl(par); + + /* check ACK is not lo */ + ctl = hcb_get_ctl(par); + if ((ctl & HCB_ACK_BIT)) { + printk(KERN_ERR "Fail because ACK is already low\n"); + return -ENXIO; + } + + return 0; +} + +void hcb_wait_for_ack(struct hecubafb_par *par) +{ + + int timeout; + unsigned char ctl; + + timeout=500; + do { + ctl = hcb_get_ctl(par); + if ((ctl & HCB_ACK_BIT)) + return; + udelay(1); + } while (timeout--); + printk(KERN_ERR "timed out waiting for ack\n"); +} + +void hcb_wait_for_ack_clear(struct hecubafb_par *par) +{ + + int timeout; + unsigned char ctl; + + timeout=500; + do { + ctl = hcb_get_ctl(par); + if (!(ctl & HCB_ACK_BIT)) + return; + udelay(1); + } while (timeout--); + printk(KERN_ERR "timed out waiting for clear\n"); +} + +void apollo_send_data(struct hecubafb_par *par, unsigned char data) +{ + /* set data */ + hcb_set_data(par, data); + + /* set DS low */ + par->ctl |= HCB_NDS_BIT; + hcb_set_ctl(par); + + hcb_wait_for_ack(par); + + /* set DS hi */ + par->ctl &= ~(HCB_NDS_BIT); + hcb_set_ctl(par); + + hcb_wait_for_ack_clear(par); +} + +void apollo_send_command(struct hecubafb_par *par, unsigned char data) +{ + /* command so set CD to high */ + par->ctl &= ~(HCB_NCD_BIT); + hcb_set_ctl(par); + + /* actually strobe with command */ + apollo_send_data(par, data); + + /* clear CD back to low */ + par->ctl |= (HCB_NCD_BIT); + hcb_set_ctl(par); +} + +/* main hecubafb functions */ + +static void hecubafb_dpy_update(struct hecubafb_par *par) +{ + int i; + unsigned char *buf = par->info->screen_base; + + apollo_send_command(par, 0xA0); + + for (i=0; i < (DPY_W*DPY_H/8); i++) { + apollo_send_data(par, *(buf++)); + } + + apollo_send_command(par, 0xA1); + apollo_send_command(par, 0xA2); +} + +/* this is called back from the deferred io workqueue */ +static void hecubafb_dpy_deferred_io(struct fb_info *info, + struct list_head *pagelist) +{ + hecubafb_dpy_update(info->par); +} + +static void hecubafb_fillrect(struct fb_info *info, + const struct fb_fillrect *rect) +{ + struct hecubafb_par *par = info->par; + + cfb_fillrect(info, rect); + + hecubafb_dpy_update(par); +} + +static void hecubafb_copyarea(struct fb_info *info, + const struct fb_copyarea *area) +{ + struct hecubafb_par *par = info->par; + + cfb_copyarea(info, area); + + hecubafb_dpy_update(par); +} + +static void hecubafb_imageblit(struct fb_info *info, + const struct fb_image *image) +{ + struct hecubafb_par *par = info->par; + + cfb_imageblit(info, image); + + hecubafb_dpy_update(par); +} + +/* + * this is the slow path from userspace. they can seek and write to + * the fb. it's inefficient to do anything less than a full screen draw + */ +static ssize_t hecubafb_write(struct file *file, const char __user *buf, + size_t count, loff_t *ppos) +{ + struct inode *inode; + int fbidx; + struct fb_info *info; + unsigned long p; + int err=-EINVAL; + struct hecubafb_par *par; + unsigned int xres; + unsigned int fbmemlength; + + p = *ppos; + inode = file->f_dentry->d_inode; + fbidx = iminor(inode); + info = registered_fb[fbidx]; + + if (!info || !info->screen_base) + return -ENODEV; + + 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 = info->screen_base; + count -= copy_from_user(base_addr + p, buf, count); + *ppos += count; + err = -EFAULT; + } + + hecubafb_dpy_update(par); + + if (count) + return count; + + return err; +} + +static struct fb_ops hecubafb_ops = { + .owner = THIS_MODULE, + .fb_write = hecubafb_write, + .fb_fillrect = hecubafb_fillrect, + .fb_copyarea = hecubafb_copyarea, + .fb_imageblit = hecubafb_imageblit, +}; + +static struct fb_deferred_io hecubafb_defio = { + .delay = HZ, + .deferred_io = hecubafb_dpy_deferred_io, +}; + +static int __devinit hecubafb_probe(struct platform_device *dev) +{ + struct fb_info *info; + int retval = -ENOMEM; + int videomemorysize; + unsigned char *videomemory; + struct hecubafb_par *par; + + videomemorysize = (DPY_W*DPY_H)/8; + + if (!(videomemory = vmalloc(videomemorysize))) + return retval; + + memset(videomemory, 0, videomemorysize); + + info = framebuffer_alloc(sizeof(struct hecubafb_par), &dev->dev); + if (!info) + goto err; + + info->screen_base = (char __iomem *) videomemory; + info->fbops = &hecubafb_ops; + + info->var = hecubafb_var; + info->fix = hecubafb_fix; + info->fix.smem_len = videomemorysize; + 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; + info->flags = FBINFO_FLAG_DEFAULT; + + info->fbdefio = &hecubafb_defio; + fb_deferred_io_init(info); + + retval = register_framebuffer(info); + if (retval < 0) + goto err1; + platform_set_drvdata(dev, info); + + printk(KERN_INFO + "fb%d: Hecuba frame buffer device, using %dK of video memory\n", + info->node, videomemorysize >> 10); + + /* this inits the dpy */ + apollo_init_control(par); + + apollo_send_command(par, APOLLO_INIT_DISPLAY); + apollo_send_data(par, 0x81); + + /* have to wait while display resets */ + udelay(1000); + + /* if we were told to splash the screen, we just clear it */ + if (!nosplash) { + apollo_send_command(par, APOLLO_ERASE_DISPLAY); + apollo_send_data(par, splashval); + } + + return 0; +err1: + framebuffer_release(info); +err: + vfree(videomemory); + return retval; +} + +static int __devexit hecubafb_remove(struct platform_device *dev) +{ + struct fb_info *info = platform_get_drvdata(dev); + + if (info) { + fb_deferred_io_cleanup(info); + unregister_framebuffer(info); + vfree(info->screen_base); + framebuffer_release(info); + } + return 0; +} + +static struct platform_driver hecubafb_driver = { + .probe = hecubafb_probe, + .remove = hecubafb_remove, + .driver = { + .name = "hecubafb", + }, +}; + +static struct platform_device *hecubafb_device; + +static int __init hecubafb_init(void) +{ + int ret; + + if (!hecubafb_enable) { + printk(KERN_ERR "Use hecubafb_enable to enable the device\n"); + return -ENXIO; + } + + ret = platform_driver_register(&hecubafb_driver); + if (!ret) { + hecubafb_device = platform_device_alloc("hecubafb", 0); + if (hecubafb_device) + ret = platform_device_add(hecubafb_device); + else + ret = -ENOMEM; + + if (ret) { + platform_device_put(hecubafb_device); + platform_driver_unregister(&hecubafb_driver); + } + } + return ret; + +} + +static void __exit hecubafb_exit(void) +{ + platform_device_unregister(hecubafb_device); + platform_driver_unregister(&hecubafb_driver); +} + +module_param(nosplash, uint, 0); +MODULE_PARM_DESC(nosplash, "Disable doing the splash screen"); +module_param(hecubafb_enable, uint, 0); +MODULE_PARM_DESC(hecubafb_enable, "Enable communication with Hecuba 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: 0x00 is black, 0x01 is white"); +module_param(irq, uint, 0); +MODULE_PARM_DESC(irq, "IRQ for the Hecuba board"); + +module_init(hecubafb_init); +module_exit(hecubafb_exit); + +MODULE_DESCRIPTION("fbdev driver for Hecuba board"); +MODULE_AUTHOR("Jaya Kumar"); +MODULE_LICENSE("GPL"); |