fbdev: hecuba Framebuffer Driver
This patch implements support for the E-Ink/hecuba display device. It uses deferred IO support. [akpm@linux-foundation.org: linker section fixes] Signed-off-by: Jaya Kumar <jayakumar.lkml@gmail.com> Signed-off-by: Antonino Daplas <adaplas@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Jaya Kumar
Linus Torvalds
Родитель
5e841b88d2
Коммит
aad09e51ee
|
|
@ -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
|
||||
|
|
|
|||
|
|
@ -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
|
||||
|
|
|
|||
|
|
@ -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");
|
||||
Загрузка…
Ссылка в новой задаче