linux/drivers/video/broadsheetfb.c
Jaya Kumar c1c341a060 broadsheetfb: add multiple panel type support
Update broadsheetfb to add support for multiple panel types.  The 3.7" and
6" are known to work but the 9.7" is untested due to lack of hardware.

Signed-off-by: Jaya Kumar <jayakumar.lkml@gmail.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Krzysztof Helt <krzysztof.h1@wp.pl>
Cc: Russell King <rmk@arm.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-03-12 15:52:32 -08:00

662 lines
16 KiB
C

/*
* broadsheetfb.c -- FB driver for E-Ink Broadsheet controller
*
* 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 Broadsheet display controller.
*
* It is intended to be architecture independent. A board specific driver
* must be used to perform all the physical IO interactions.
*
*/
#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 <linux/uaccess.h>
#include <video/broadsheetfb.h>
/* track panel specific parameters */
struct panel_info {
int w;
int h;
u16 sdcfg;
u16 gdcfg;
u16 lutfmt;
u16 fsynclen;
u16 fendfbegin;
u16 lsynclen;
u16 lendlbegin;
u16 pixclk;
};
/* table of panel specific parameters to be indexed into by the board drivers */
static struct panel_info panel_table[] = {
{ /* standard 6" on TFT backplane */
.w = 800,
.h = 600,
.sdcfg = (100 | (1 << 8) | (1 << 9)),
.gdcfg = 2,
.lutfmt = (4 | (1 << 7)),
.fsynclen = 4,
.fendfbegin = (10 << 8) | 4,
.lsynclen = 10,
.lendlbegin = (100 << 8) | 4,
.pixclk = 6,
},
{ /* custom 3.7" flexible on PET or steel */
.w = 320,
.h = 240,
.sdcfg = (67 | (0 << 8) | (0 << 9) | (0 << 10) | (0 << 12)),
.gdcfg = 3,
.lutfmt = (4 | (1 << 7)),
.fsynclen = 0,
.fendfbegin = (80 << 8) | 4,
.lsynclen = 10,
.lendlbegin = (80 << 8) | 20,
.pixclk = 14,
},
{ /* standard 9.7" on TFT backplane */
.w = 1200,
.h = 825,
.sdcfg = (100 | (1 << 8) | (1 << 9) | (0 << 10) | (0 << 12)),
.gdcfg = 2,
.lutfmt = (4 | (1 << 7)),
.fsynclen = 0,
.fendfbegin = (4 << 8) | 4,
.lsynclen = 4,
.lendlbegin = (60 << 8) | 10,
.pixclk = 3,
},
};
#define DPY_W 800
#define DPY_H 600
static struct fb_fix_screeninfo broadsheetfb_fix __devinitdata = {
.id = "broadsheetfb",
.type = FB_TYPE_PACKED_PIXELS,
.visual = FB_VISUAL_STATIC_PSEUDOCOLOR,
.xpanstep = 0,
.ypanstep = 0,
.ywrapstep = 0,
.line_length = DPY_W,
.accel = FB_ACCEL_NONE,
};
static struct fb_var_screeninfo broadsheetfb_var __devinitdata = {
.xres = DPY_W,
.yres = DPY_H,
.xres_virtual = DPY_W,
.yres_virtual = DPY_H,
.bits_per_pixel = 8,
.grayscale = 1,
.red = { 0, 4, 0 },
.green = { 0, 4, 0 },
.blue = { 0, 4, 0 },
.transp = { 0, 0, 0 },
};
/* main broadsheetfb functions */
static void broadsheet_issue_data(struct broadsheetfb_par *par, u16 data)
{
par->board->set_ctl(par, BS_WR, 0);
par->board->set_hdb(par, data);
par->board->set_ctl(par, BS_WR, 1);
}
static void broadsheet_issue_cmd(struct broadsheetfb_par *par, u16 data)
{
par->board->set_ctl(par, BS_DC, 0);
broadsheet_issue_data(par, data);
}
static void broadsheet_send_command(struct broadsheetfb_par *par, u16 data)
{
par->board->wait_for_rdy(par);
par->board->set_ctl(par, BS_CS, 0);
broadsheet_issue_cmd(par, data);
par->board->set_ctl(par, BS_DC, 1);
par->board->set_ctl(par, BS_CS, 1);
}
static void broadsheet_send_cmdargs(struct broadsheetfb_par *par, u16 cmd,
int argc, u16 *argv)
{
int i;
par->board->wait_for_rdy(par);
par->board->set_ctl(par, BS_CS, 0);
broadsheet_issue_cmd(par, cmd);
par->board->set_ctl(par, BS_DC, 1);
for (i = 0; i < argc; i++)
broadsheet_issue_data(par, argv[i]);
par->board->set_ctl(par, BS_CS, 1);
}
static void broadsheet_burst_write(struct broadsheetfb_par *par, int size,
u16 *data)
{
int i;
u16 tmp;
par->board->set_ctl(par, BS_CS, 0);
par->board->set_ctl(par, BS_DC, 1);
for (i = 0; i < size; i++) {
par->board->set_ctl(par, BS_WR, 0);
tmp = (data[i] & 0x0F) << 4;
tmp |= (data[i] & 0x0F00) << 4;
par->board->set_hdb(par, tmp);
par->board->set_ctl(par, BS_WR, 1);
}
par->board->set_ctl(par, BS_CS, 1);
}
static u16 broadsheet_get_data(struct broadsheetfb_par *par)
{
u16 res;
/* wait for ready to go hi. (lo is busy) */
par->board->wait_for_rdy(par);
/* cs lo, dc lo for cmd, we lo for each data, db as usual */
par->board->set_ctl(par, BS_DC, 1);
par->board->set_ctl(par, BS_CS, 0);
par->board->set_ctl(par, BS_WR, 0);
res = par->board->get_hdb(par);
/* strobe wr */
par->board->set_ctl(par, BS_WR, 1);
par->board->set_ctl(par, BS_CS, 1);
return res;
}
static void broadsheet_write_reg(struct broadsheetfb_par *par, u16 reg,
u16 data)
{
/* wait for ready to go hi. (lo is busy) */
par->board->wait_for_rdy(par);
/* cs lo, dc lo for cmd, we lo for each data, db as usual */
par->board->set_ctl(par, BS_CS, 0);
broadsheet_issue_cmd(par, BS_CMD_WR_REG);
par->board->set_ctl(par, BS_DC, 1);
broadsheet_issue_data(par, reg);
broadsheet_issue_data(par, data);
par->board->set_ctl(par, BS_CS, 1);
}
static void broadsheet_write_reg32(struct broadsheetfb_par *par, u16 reg,
u32 data)
{
broadsheet_write_reg(par, reg, cpu_to_le32(data) & 0xFFFF);
broadsheet_write_reg(par, reg + 2, (cpu_to_le32(data) >> 16) & 0xFFFF);
}
static u16 broadsheet_read_reg(struct broadsheetfb_par *par, u16 reg)
{
broadsheet_send_command(par, reg);
msleep(100);
return broadsheet_get_data(par);
}
static void __devinit broadsheet_init_display(struct broadsheetfb_par *par)
{
u16 args[5];
int xres = par->info->var.xres;
int yres = par->info->var.yres;
args[0] = panel_table[par->panel_index].w;
args[1] = panel_table[par->panel_index].h;
args[2] = panel_table[par->panel_index].sdcfg;
args[3] = panel_table[par->panel_index].gdcfg;
args[4] = panel_table[par->panel_index].lutfmt;
broadsheet_send_cmdargs(par, BS_CMD_INIT_DSPE_CFG, 5, args);
/* did the controller really set it? */
broadsheet_send_cmdargs(par, BS_CMD_INIT_DSPE_CFG, 5, args);
args[0] = panel_table[par->panel_index].fsynclen;
args[1] = panel_table[par->panel_index].fendfbegin;
args[2] = panel_table[par->panel_index].lsynclen;
args[3] = panel_table[par->panel_index].lendlbegin;
args[4] = panel_table[par->panel_index].pixclk;
broadsheet_send_cmdargs(par, BS_CMD_INIT_DSPE_TMG, 5, args);
broadsheet_write_reg32(par, 0x310, xres*yres*2);
/* setup waveform */
args[0] = 0x886;
args[1] = 0;
broadsheet_send_cmdargs(par, BS_CMD_RD_WFM_INFO, 2, args);
broadsheet_send_command(par, BS_CMD_UPD_GDRV_CLR);
broadsheet_send_command(par, BS_CMD_WAIT_DSPE_TRG);
broadsheet_write_reg(par, 0x330, 0x84);
broadsheet_send_command(par, BS_CMD_WAIT_DSPE_TRG);
args[0] = (0x3 << 4);
broadsheet_send_cmdargs(par, BS_CMD_LD_IMG, 1, args);
args[0] = 0x154;
broadsheet_send_cmdargs(par, BS_CMD_WR_REG, 1, args);
broadsheet_burst_write(par, (panel_table[par->panel_index].w *
panel_table[par->panel_index].h)/2,
(u16 *) par->info->screen_base);
broadsheet_send_command(par, BS_CMD_LD_IMG_END);
args[0] = 0x4300;
broadsheet_send_cmdargs(par, BS_CMD_UPD_FULL, 1, args);
broadsheet_send_command(par, BS_CMD_WAIT_DSPE_TRG);
broadsheet_send_command(par, BS_CMD_WAIT_DSPE_FREND);
par->board->wait_for_rdy(par);
}
static void __devinit broadsheet_init(struct broadsheetfb_par *par)
{
broadsheet_send_command(par, BS_CMD_INIT_SYS_RUN);
/* the controller needs a second */
msleep(1000);
broadsheet_init_display(par);
}
static void broadsheetfb_dpy_update_pages(struct broadsheetfb_par *par,
u16 y1, u16 y2)
{
u16 args[5];
unsigned char *buf = (unsigned char *)par->info->screen_base;
/* y1 must be a multiple of 4 so drop the lower bits */
y1 &= 0xFFFC;
/* y2 must be a multiple of 4 , but - 1 so up the lower bits */
y2 |= 0x0003;
args[0] = 0x3 << 4;
args[1] = 0;
args[2] = y1;
args[3] = cpu_to_le16(par->info->var.xres);
args[4] = y2;
broadsheet_send_cmdargs(par, BS_CMD_LD_IMG_AREA, 5, args);
args[0] = 0x154;
broadsheet_send_cmdargs(par, BS_CMD_WR_REG, 1, args);
buf += y1 * par->info->var.xres;
broadsheet_burst_write(par, ((1 + y2 - y1) * par->info->var.xres)/2,
(u16 *) buf);
broadsheet_send_command(par, BS_CMD_LD_IMG_END);
args[0] = 0x4300;
broadsheet_send_cmdargs(par, BS_CMD_UPD_FULL, 1, args);
broadsheet_send_command(par, BS_CMD_WAIT_DSPE_TRG);
broadsheet_send_command(par, BS_CMD_WAIT_DSPE_FREND);
par->board->wait_for_rdy(par);
}
static void broadsheetfb_dpy_update(struct broadsheetfb_par *par)
{
u16 args[5];
args[0] = 0x3 << 4;
broadsheet_send_cmdargs(par, BS_CMD_LD_IMG, 1, args);
args[0] = 0x154;
broadsheet_send_cmdargs(par, BS_CMD_WR_REG, 1, args);
broadsheet_burst_write(par, (panel_table[par->panel_index].w *
panel_table[par->panel_index].h)/2,
(u16 *) par->info->screen_base);
broadsheet_send_command(par, BS_CMD_LD_IMG_END);
args[0] = 0x4300;
broadsheet_send_cmdargs(par, BS_CMD_UPD_FULL, 1, args);
broadsheet_send_command(par, BS_CMD_WAIT_DSPE_TRG);
broadsheet_send_command(par, BS_CMD_WAIT_DSPE_FREND);
par->board->wait_for_rdy(par);
}
/* this is called back from the deferred io workqueue */
static void broadsheetfb_dpy_deferred_io(struct fb_info *info,
struct list_head *pagelist)
{
u16 y1 = 0, h = 0;
int prev_index = -1;
struct page *cur;
struct fb_deferred_io *fbdefio = info->fbdefio;
int h_inc;
u16 yres = info->var.yres;
u16 xres = info->var.xres;
/* height increment is fixed per page */
h_inc = DIV_ROUND_UP(PAGE_SIZE , xres);
/* walk the written page list and swizzle the data */
list_for_each_entry(cur, &fbdefio->pagelist, lru) {
if (prev_index < 0) {
/* just starting so assign first page */
y1 = (cur->index << PAGE_SHIFT) / xres;
h = h_inc;
} else if ((prev_index + 1) == cur->index) {
/* this page is consecutive so increase our height */
h += h_inc;
} else {
/* page not consecutive, issue previous update first */
broadsheetfb_dpy_update_pages(info->par, y1, y1 + h);
/* start over with our non consecutive page */
y1 = (cur->index << PAGE_SHIFT) / xres;
h = h_inc;
}
prev_index = cur->index;
}
/* if we still have any pages to update we do so now */
if (h >= yres) {
/* its a full screen update, just do it */
broadsheetfb_dpy_update(info->par);
} else {
broadsheetfb_dpy_update_pages(info->par, y1,
min((u16) (y1 + h), yres));
}
}
static void broadsheetfb_fillrect(struct fb_info *info,
const struct fb_fillrect *rect)
{
struct broadsheetfb_par *par = info->par;
sys_fillrect(info, rect);
broadsheetfb_dpy_update(par);
}
static void broadsheetfb_copyarea(struct fb_info *info,
const struct fb_copyarea *area)
{
struct broadsheetfb_par *par = info->par;
sys_copyarea(info, area);
broadsheetfb_dpy_update(par);
}
static void broadsheetfb_imageblit(struct fb_info *info,
const struct fb_image *image)
{
struct broadsheetfb_par *par = info->par;
sys_imageblit(info, image);
broadsheetfb_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 broadsheetfb_write(struct fb_info *info, const char __user *buf,
size_t count, loff_t *ppos)
{
struct broadsheetfb_par *par = info->par;
unsigned long p = *ppos;
void *dst;
int err = 0;
unsigned long total_size;
if (info->state != FBINFO_STATE_RUNNING)
return -EPERM;
total_size = info->fix.smem_len;
if (p > total_size)
return -EFBIG;
if (count > total_size) {
err = -EFBIG;
count = total_size;
}
if (count + p > total_size) {
if (!err)
err = -ENOSPC;
count = total_size - p;
}
dst = (void *)(info->screen_base + p);
if (copy_from_user(dst, buf, count))
err = -EFAULT;
if (!err)
*ppos += count;
broadsheetfb_dpy_update(par);
return (err) ? err : count;
}
static struct fb_ops broadsheetfb_ops = {
.owner = THIS_MODULE,
.fb_read = fb_sys_read,
.fb_write = broadsheetfb_write,
.fb_fillrect = broadsheetfb_fillrect,
.fb_copyarea = broadsheetfb_copyarea,
.fb_imageblit = broadsheetfb_imageblit,
};
static struct fb_deferred_io broadsheetfb_defio = {
.delay = HZ/4,
.deferred_io = broadsheetfb_dpy_deferred_io,
};
static int __devinit broadsheetfb_probe(struct platform_device *dev)
{
struct fb_info *info;
struct broadsheet_board *board;
int retval = -ENOMEM;
int videomemorysize;
unsigned char *videomemory;
struct broadsheetfb_par *par;
int i;
int dpyw, dpyh;
int panel_index;
/* 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;
info = framebuffer_alloc(sizeof(struct broadsheetfb_par), &dev->dev);
if (!info)
goto err;
switch (board->get_panel_type()) {
case 37:
panel_index = 1;
break;
case 97:
panel_index = 2;
break;
case 6:
default:
panel_index = 0;
break;
}
dpyw = panel_table[panel_index].w;
dpyh = panel_table[panel_index].h;
videomemorysize = roundup((dpyw*dpyh), PAGE_SIZE);
videomemory = vmalloc(videomemorysize);
if (!videomemory)
goto err_fb_rel;
memset(videomemory, 0, videomemorysize);
info->screen_base = (char *)videomemory;
info->fbops = &broadsheetfb_ops;
broadsheetfb_var.xres = dpyw;
broadsheetfb_var.yres = dpyh;
broadsheetfb_var.xres_virtual = dpyw;
broadsheetfb_var.yres_virtual = dpyh;
info->var = broadsheetfb_var;
broadsheetfb_fix.line_length = dpyw;
info->fix = broadsheetfb_fix;
info->fix.smem_len = videomemorysize;
par = info->par;
par->panel_index = panel_index;
par->info = info;
par->board = board;
par->write_reg = broadsheet_write_reg;
par->read_reg = broadsheet_read_reg;
init_waitqueue_head(&par->waitq);
info->flags = FBINFO_FLAG_DEFAULT | FBINFO_VIRTFB;
info->fbdefio = &broadsheetfb_defio;
fb_deferred_io_init(info);
retval = fb_alloc_cmap(&info->cmap, 16, 0);
if (retval < 0) {
dev_err(&dev->dev, "Failed to allocate colormap\n");
goto err_vfree;
}
/* set cmap */
for (i = 0; i < 16; i++)
info->cmap.red[i] = (((2*i)+1)*(0xFFFF))/32;
memcpy(info->cmap.green, info->cmap.red, sizeof(u16)*16);
memcpy(info->cmap.blue, info->cmap.red, sizeof(u16)*16);
retval = par->board->setup_irq(info);
if (retval < 0)
goto err_cmap;
/* this inits the dpy */
retval = board->init(par);
if (retval < 0)
goto err_free_irq;
broadsheet_init(par);
retval = register_framebuffer(info);
if (retval < 0)
goto err_free_irq;
platform_set_drvdata(dev, info);
printk(KERN_INFO
"fb%d: Broadsheet frame buffer, using %dK of video memory\n",
info->node, videomemorysize >> 10);
return 0;
err_free_irq:
board->cleanup(par);
err_cmap:
fb_dealloc_cmap(&info->cmap);
err_vfree:
vfree(videomemory);
err_fb_rel:
framebuffer_release(info);
err:
module_put(board->owner);
return retval;
}
static int __devexit broadsheetfb_remove(struct platform_device *dev)
{
struct fb_info *info = platform_get_drvdata(dev);
if (info) {
struct broadsheetfb_par *par = info->par;
unregister_framebuffer(info);
fb_deferred_io_cleanup(info);
par->board->cleanup(par);
fb_dealloc_cmap(&info->cmap);
vfree((void *)info->screen_base);
module_put(par->board->owner);
framebuffer_release(info);
}
return 0;
}
static struct platform_driver broadsheetfb_driver = {
.probe = broadsheetfb_probe,
.remove = broadsheetfb_remove,
.driver = {
.owner = THIS_MODULE,
.name = "broadsheetfb",
},
};
static int __init broadsheetfb_init(void)
{
return platform_driver_register(&broadsheetfb_driver);
}
static void __exit broadsheetfb_exit(void)
{
platform_driver_unregister(&broadsheetfb_driver);
}
module_init(broadsheetfb_init);
module_exit(broadsheetfb_exit);
MODULE_DESCRIPTION("fbdev driver for Broadsheet controller");
MODULE_AUTHOR("Jaya Kumar");
MODULE_LICENSE("GPL");