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fbdev: platforming hecubafb and n411

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This patch splits hecubafb into the platform independent hecubafb and the
platform dependent n411.

Signed-off-by: Jaya Kumar <jayakumar.lkml@gmail.com>
Cc: "Antonino A. Daplas" <adaplas@pol.net>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
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
2008-04-28 02:15:40 -07:00
committed by Linus Torvalds
parent 2422fbba06
commit 0e27aa3dab
4 changed files with 314 additions and 206 deletions
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17
drivers/video/Kconfig
View File

@@ -178,6 +178,11 @@ config FB_METRONOME
depends on FB depends on FB
depends on FB_DEFERRED_IO depends on FB_DEFERRED_IO
config FB_HECUBA
tristate
depends on FB
depends on FB_DEFERRED_IO
config FB_SVGALIB config FB_SVGALIB
tristate tristate
depends on FB depends on FB
@@ -703,20 +708,18 @@ config FB_IMAC
help help
This is the frame buffer device driver for the Intel-based Macintosh This is the frame buffer device driver for the Intel-based Macintosh
config FB_HECUBA config FB_N411
tristate "Hecuba board support" tristate "N411 Apollo/Hecuba devkit support"
depends on FB && X86 && MMU depends on FB && X86 && MMU
select FB_SYS_FILLRECT select FB_SYS_FILLRECT
select FB_SYS_COPYAREA select FB_SYS_COPYAREA
select FB_SYS_IMAGEBLIT select FB_SYS_IMAGEBLIT
select FB_SYS_FOPS select FB_SYS_FOPS
select FB_DEFERRED_IO select FB_DEFERRED_IO
select FB_HECUBA
help help
This enables support for the Hecuba board. This driver was tested This enables support for the Apollo display controller in its
with an E-Ink 800x600 display and x86 SBCs through a 16 bit GPIO Hecuba form using the n411 devkit.
interface (8 bit data, 4 bit control). If you anticipate 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 config FB_HGA
tristate "Hercules mono graphics support" tristate "Hercules mono graphics support"

250
drivers/video/hecubafb.c
View File

@@ -1,5 +1,5 @@
/* /*
* linux/drivers/video/hecubafb.c -- FB driver for Hecuba controller * linux/drivers/video/hecubafb.c -- FB driver for Hecuba/Apollo controller
* *
* Copyright (C) 2006, Jaya Kumar * Copyright (C) 2006, Jaya Kumar
* This work was sponsored by CIS(M) Sdn Bhd * This work was sponsored by CIS(M) Sdn Bhd
@@ -17,18 +17,13 @@
* values. There are other commands that the display is capable of, * values. There are other commands that the display is capable of,
* beyond the 5 used here but they are more complex. * beyond the 5 used here but they are more complex.
* *
* This driver is written to be used with the Hecuba display controller * This driver is written to be used with the Hecuba display architecture.
* board, and tested with the EInk 800x600 display in 1 bit mode. * The actual display chip is called Apollo and the interface electronics
* The interface between Hecuba and the host is TTL based GPIO. The * it needs is called Hecuba.
* 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: * It is intended to be architecture independent. A board specific driver
* - User must set hecubafb_enable=1 to enable it * must be used to perform all the physical IO interactions. An example
* - User must set dio_addr=0xIOADDR cio_addr=0xIOADDR c2io_addr=0xIOADDR * is provided as n411.c
* *
*/ */
@@ -47,34 +42,12 @@
#include <linux/list.h> #include <linux/list.h>
#include <linux/uaccess.h> #include <linux/uaccess.h>
/* Apollo controller specific defines */ #include <video/hecubafb.h>
#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 */ /* Display specific information */
#define DPY_W 600 #define DPY_W 600
#define DPY_H 800 #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 = { static struct fb_fix_screeninfo hecubafb_fix __devinitdata = {
.id = "hecubafb", .id = "hecubafb",
.type = FB_TYPE_PACKED_PIXELS, .type = FB_TYPE_PACKED_PIXELS,
@@ -82,6 +55,7 @@ static struct fb_fix_screeninfo hecubafb_fix __devinitdata = {
.xpanstep = 0, .xpanstep = 0,
.ypanstep = 0, .ypanstep = 0,
.ywrapstep = 0, .ywrapstep = 0,
.line_length = DPY_W,
.accel = FB_ACCEL_NONE, .accel = FB_ACCEL_NONE,
}; };
@@ -94,136 +68,51 @@ static struct fb_var_screeninfo hecubafb_var __devinitdata = {
.nonstd = 1, .nonstd = 1,
}; };
static unsigned long dio_addr; /* main hecubafb functions */
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;
}
static 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");
}
static 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");
}
static void apollo_send_data(struct hecubafb_par *par, unsigned char data) static void apollo_send_data(struct hecubafb_par *par, unsigned char data)
{ {
/* set data */ /* set data */
hcb_set_data(par, data); par->board->set_data(par, data);
/* set DS low */ /* set DS low */
par->ctl |= HCB_NDS_BIT; par->board->set_ctl(par, HCB_DS_BIT, 0);
hcb_set_ctl(par);
hcb_wait_for_ack(par); /* wait for ack */
par->board->wait_for_ack(par, 0);
/* set DS hi */ /* set DS hi */
par->ctl &= ~(HCB_NDS_BIT); par->board->set_ctl(par, HCB_DS_BIT, 1);
hcb_set_ctl(par);
hcb_wait_for_ack_clear(par); /* wait for ack to clear */
par->board->wait_for_ack(par, 1);
} }
static void apollo_send_command(struct hecubafb_par *par, unsigned char data) static void apollo_send_command(struct hecubafb_par *par, unsigned char data)
{ {
/* command so set CD to high */ /* command so set CD to high */
par->ctl &= ~(HCB_NCD_BIT); par->board->set_ctl(par, HCB_CD_BIT, 1);
hcb_set_ctl(par);
/* actually strobe with command */ /* actually strobe with command */
apollo_send_data(par, data); apollo_send_data(par, data);
/* clear CD back to low */ /* clear CD back to low */
par->ctl |= (HCB_NCD_BIT); par->board->set_ctl(par, HCB_CD_BIT, 0);
hcb_set_ctl(par);
} }
/* main hecubafb functions */
static void hecubafb_dpy_update(struct hecubafb_par *par) static void hecubafb_dpy_update(struct hecubafb_par *par)
{ {
int i; int i;
unsigned char *buf = (unsigned char __force *)par->info->screen_base; unsigned char *buf = (unsigned char __force *)par->info->screen_base;
apollo_send_command(par, 0xA0); apollo_send_command(par, APOLLO_START_NEW_IMG);
for (i=0; i < (DPY_W*DPY_H/8); i++) { for (i=0; i < (DPY_W*DPY_H/8); i++) {
apollo_send_data(par, *(buf++)); apollo_send_data(par, *(buf++));
} }
apollo_send_command(par, 0xA1); apollo_send_command(par, APOLLO_STOP_IMG_DATA);
apollo_send_command(par, 0xA2); apollo_send_command(par, APOLLO_DISPLAY_IMG);
} }
/* this is called back from the deferred io workqueue */ /* this is called back from the deferred io workqueue */
@@ -326,11 +215,21 @@ static struct fb_deferred_io hecubafb_defio = {
static int __devinit hecubafb_probe(struct platform_device *dev) static int __devinit hecubafb_probe(struct platform_device *dev)
{ {
struct fb_info *info; struct fb_info *info;
struct hecuba_board *board;
int retval = -ENOMEM; int retval = -ENOMEM;
int videomemorysize; int videomemorysize;
unsigned char *videomemory; unsigned char *videomemory;
struct hecubafb_par *par; struct hecubafb_par *par;
/* pick up board specific routines */
board = dev->dev.platform_data;
if (!board)
return -EINVAL;
/* try to count device specific driver, if can't, platform recalls */
if (!try_module_get(board->owner))
return -ENODEV;
videomemorysize = (DPY_W*DPY_H)/8; videomemorysize = (DPY_W*DPY_H)/8;
if (!(videomemory = vmalloc(videomemorysize))) if (!(videomemory = vmalloc(videomemorysize)))
@@ -340,9 +239,9 @@ static int __devinit hecubafb_probe(struct platform_device *dev)
info = framebuffer_alloc(sizeof(struct hecubafb_par), &dev->dev); info = framebuffer_alloc(sizeof(struct hecubafb_par), &dev->dev);
if (!info) if (!info)
goto err; goto err_fballoc;
info->screen_base = (char __iomem *) videomemory; info->screen_base = (char __force __iomem *)videomemory;
info->fbops = &hecubafb_ops; info->fbops = &hecubafb_ops;
info->var = hecubafb_var; info->var = hecubafb_var;
@@ -350,14 +249,10 @@ static int __devinit hecubafb_probe(struct platform_device *dev)
info->fix.smem_len = videomemorysize; info->fix.smem_len = videomemorysize;
par = info->par; par = info->par;
par->info = info; par->info = info;
par->board = board;
par->send_command = apollo_send_command;
par->send_data = apollo_send_data;
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->flags = FBINFO_FLAG_DEFAULT;
info->fbdefio = &hecubafb_defio; info->fbdefio = &hecubafb_defio;
@@ -365,7 +260,7 @@ static int __devinit hecubafb_probe(struct platform_device *dev)
retval = register_framebuffer(info); retval = register_framebuffer(info);
if (retval < 0) if (retval < 0)
goto err1; goto err_fbreg;
platform_set_drvdata(dev, info); platform_set_drvdata(dev, info);
printk(KERN_INFO printk(KERN_INFO
@@ -373,25 +268,16 @@ static int __devinit hecubafb_probe(struct platform_device *dev)
info->node, videomemorysize >> 10); info->node, videomemorysize >> 10);
/* this inits the dpy */ /* this inits the dpy */
apollo_init_control(par); retval = par->board->init(par);
if (retval < 0)
apollo_send_command(par, APOLLO_INIT_DISPLAY); goto err_fbreg;
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; return 0;
err1: err_fbreg:
framebuffer_release(info); framebuffer_release(info);
err: err_fballoc:
vfree(videomemory); vfree(videomemory);
module_put(board->owner);
return retval; return retval;
} }
@@ -400,9 +286,13 @@ static int __devexit hecubafb_remove(struct platform_device *dev)
struct fb_info *info = platform_get_drvdata(dev); struct fb_info *info = platform_get_drvdata(dev);
if (info) { if (info) {
struct hecubafb_par *par = info->par;
fb_deferred_io_cleanup(info); fb_deferred_io_cleanup(info);
unregister_framebuffer(info); unregister_framebuffer(info);
vfree((void __force *)info->screen_base); vfree((void __force *)info->screen_base);
if (par->board->remove)
par->board->remove(par);
module_put(par->board->owner);
framebuffer_release(info); framebuffer_release(info);
} }
return 0; return 0;
@@ -412,62 +302,24 @@ static struct platform_driver hecubafb_driver = {
.probe = hecubafb_probe, .probe = hecubafb_probe,
.remove = hecubafb_remove, .remove = hecubafb_remove,
.driver = { .driver = {
.owner = THIS_MODULE,
.name = "hecubafb", .name = "hecubafb",
}, },
}; };
static struct platform_device *hecubafb_device;
static int __init hecubafb_init(void) static int __init hecubafb_init(void)
{ {
int ret; return platform_driver_register(&hecubafb_driver);
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) static void __exit hecubafb_exit(void)
{ {
platform_device_unregister(hecubafb_device);
platform_driver_unregister(&hecubafb_driver); 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_init(hecubafb_init);
module_exit(hecubafb_exit); module_exit(hecubafb_exit);
MODULE_DESCRIPTION("fbdev driver for Hecuba board"); MODULE_DESCRIPTION("fbdev driver for Hecuba/Apollo controller");
MODULE_AUTHOR("Jaya Kumar"); MODULE_AUTHOR("Jaya Kumar");
MODULE_LICENSE("GPL"); MODULE_LICENSE("GPL");

202
drivers/video/n411.c Normal file
View File

@@ -0,0 +1,202 @@
/*
* linux/drivers/video/n411.c -- Platform device for N411 EPD kit
*
* Copyright (C) 2008, Jaya Kumar
*
* 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 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 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/delay.h>
#include <linux/interrupt.h>
#include <linux/fb.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/list.h>
#include <linux/uaccess.h>
#include <linux/irq.h>
#include <video/hecubafb.h>
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 char ctl;
static void n411_set_ctl(struct hecubafb_par *par, unsigned char bit, unsigned
char state)
{
switch (bit) {
case HCB_CD_BIT:
if (state)
ctl &= ~(HCB_CD_BIT);
else
ctl |= HCB_CD_BIT;
break;
case HCB_DS_BIT:
if (state)
ctl &= ~(HCB_DS_BIT);
else
ctl |= HCB_DS_BIT;
break;
}
outb(ctl, cio_addr);
}
static unsigned char n411_get_ctl(struct hecubafb_par *par)
{
return inb(c2io_addr);
}
static void n411_set_data(struct hecubafb_par *par, unsigned char value)
{
outb(value, dio_addr);
}
static void n411_wait_for_ack(struct hecubafb_par *par, int clear)
{
int timeout;
unsigned char tmp;
timeout = 500;
do {
tmp = n411_get_ctl(par);
if ((tmp & HCB_ACK_BIT) && (!clear))
return;
else if (!(tmp & HCB_ACK_BIT) && (clear))
return;
udelay(1);
} while (timeout--);
printk(KERN_ERR "timed out waiting for ack\n");
}
static int n411_init_control(struct hecubafb_par *par)
{
unsigned char tmp;
/* 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 */
ctl = HCB_WUP_BIT | HCB_RW_BIT | HCB_CD_BIT ;
n411_set_ctl(par, HCB_DS_BIT, 1);
/* check ACK is not lo */
tmp = n411_get_ctl(par);
if (tmp & HCB_ACK_BIT) {
printk(KERN_ERR "Fail because ACK is already low\n");
return -ENXIO;
}
return 0;
}
static int n411_init_board(struct hecubafb_par *par)
{
int retval;
retval = n411_init_control(par);
if (retval)
return retval;
par->send_command(par, APOLLO_INIT_DISPLAY);
par->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) {
par->send_command(par, APOLLO_ERASE_DISPLAY);
par->send_data(par, splashval);
}
return 0;
}
static struct hecuba_board n411_board = {
.owner = THIS_MODULE,
.init = n411_init_board,
.set_ctl = n411_set_ctl,
.set_data = n411_set_data,
.wait_for_ack = n411_wait_for_ack,
};
static struct platform_device *n411_device;
static int __init n411_init(void)
{
int ret;
if (!dio_addr || !cio_addr || !c2io_addr) {
printk(KERN_WARNING "no IO addresses supplied\n");
return -EINVAL;
}
/* request our platform independent driver */
request_module("hecubafb");
n411_device = platform_device_alloc("hecubafb", -1);
if (!n411_device)
return -ENOMEM;
platform_device_add_data(n411_device, &n411_board, sizeof(n411_board));
/* this _add binds hecubafb to n411. hecubafb refcounts n411 */
ret = platform_device_add(n411_device);
if (ret)
platform_device_put(n411_device);
return ret;
}
static void __exit n411_exit(void)
{
platform_device_unregister(n411_device);
}
module_init(n411_init);
module_exit(n411_exit);
module_param(nosplash, uint, 0);
MODULE_PARM_DESC(nosplash, "Disable doing the splash screen");
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_DESCRIPTION("board driver for n411 hecuba/apollo epd kit");
MODULE_AUTHOR("Jaya Kumar");
MODULE_LICENSE("GPL");

51
include/video/hecubafb.h Normal file
View File

@@ -0,0 +1,51 @@
/*
* hecubafb.h - definitions for the hecuba framebuffer driver
*
* Copyright (C) 2008 by Jaya Kumar
*
* 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.
*
*/
#ifndef _LINUX_HECUBAFB_H_
#define _LINUX_HECUBAFB_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 */
#define HCB_WUP_BIT 0x01
#define HCB_DS_BIT 0x02
#define HCB_RW_BIT 0x04
#define HCB_CD_BIT 0x08
#define HCB_ACK_BIT 0x80
/* struct used by hecuba. board specific stuff comes from *board */
struct hecubafb_par {
struct fb_info *info;
struct hecuba_board *board;
void (*send_command)(struct hecubafb_par *, unsigned char);
void (*send_data)(struct hecubafb_par *, unsigned char);
};
/* board specific routines
board drivers can implement wait_for_ack with interrupts if desired. if
wait_for_ack is called with clear=0, then go to sleep and return when ack
goes hi or if wait_for_ack with clear=1, then return when ack goes lo */
struct hecuba_board {
struct module *owner;
void (*remove)(struct hecubafb_par *);
void (*set_ctl)(struct hecubafb_par *, unsigned char, unsigned char);
void (*set_data)(struct hecubafb_par *, unsigned char);
void (*wait_for_ack)(struct hecubafb_par *, int);
int (*init)(struct hecubafb_par *);
};
#endif