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openwrt/target/linux/ubicom32/files/drivers/video/backlight/ubicom32lcd.c

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/*
* drivers/video/ubicom32lcd.c
* LCD initilization code
*
* (C) Copyright 2009, Ubicom, Inc.
*
* This file is part of the Ubicom32 Linux Kernel Port.
*
* The Ubicom32 Linux Kernel Port is free software: you can redistribute
* it and/or modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation, either version 2 of the
* License, or (at your option) any later version.
*
* The Ubicom32 Linux Kernel Port is distributed in the hope that it
* will be useful, but WITHOUT ANY WARRANTY; without even the implied
* warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
* the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with the Ubicom32 Linux Kernel Port. If not,
* see <http://www.gnu.org/licenses/>.
*/
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/delay.h>
#include <asm/ip5000.h>
#include <asm/gpio.h>
#include <asm/ubicom32lcd.h>
#include "ubicom32lcd.h"
#define DRIVER_NAME "ubicom32lcd"
struct ubicom32lcd_data {
const struct ubicom32lcd_panel *panel;
int pin_cs;
int pin_rd;
int pin_rs;
int pin_wr;
int pin_reset;
struct ubicom32_io_port *port_data;
int data_shift;
};
/*
* ubicom32lcd_write
* Performs a write cycle on the bus (assumes CS asserted, RD & WR set)
*/
static void ubicom32lcd_write(struct ubicom32lcd_data *ud, int command, u16 data)
{
if (command) {
UBICOM32_GPIO_SET_PIN_LOW(ud->pin_rs);
} else {
UBICOM32_GPIO_SET_PIN_HIGH(ud->pin_rs);
}
asm volatile (
"or.4 4(%[port]), 4(%[port]), %[mask] \n\t"
"not.4 %[mask], %[mask] \n\t"
"and.4 8(%[port]), 8(%[port]), %[mask] \n\t"
"or.4 8(%[port]), 8(%[port]), %[cmd] \n\t"
:
: [port] "a" (ud->port_data),
[mask] "d" (0xFFFF << ud->data_shift),
[cmd] "d" (data << ud->data_shift)
: "cc"
);
UBICOM32_GPIO_SET_PIN_LOW(ud->pin_wr);
//ndelay(50);
udelay(1);
UBICOM32_GPIO_SET_PIN_HIGH(ud->pin_wr);
udelay(1);
//ndelay(50);
}
/*
* ubicom32lcd_read_data
* Performs a read cycle on the bus (assumes CS asserted, RD & WR set)
*/
static u16 ubicom32lcd_read_data(struct ubicom32lcd_data *ud)
{
u32_t data;
UBICOM32_GPIO_SET_PIN_HIGH(ud->pin_rs);
asm volatile (
"and.4 4(%[port]), 4(%[port]), %[mask]\n\t"
:
: [port] "a" (ud->port_data),
[mask] "d" (~(0xFFFF << ud->data_shift))
: "cc"
);
UBICOM32_GPIO_SET_PIN_LOW(ud->pin_rd);
ndelay(300);
asm volatile (
"lsr.4 %[data], 12(%[port]), %[shamt] \n\t"
"and.4 %[data], %[data], %[mask] \n\t"
: [data] "=d" (data)
: [port] "a" (ud->port_data),
[mask] "d" (0xFFFF),
[shamt] "d" (ud->data_shift)
: "cc"
);
ndelay(200);
UBICOM32_GPIO_SET_PIN_HIGH(ud->pin_rd);
ndelay(500);
return data;
}
/*
* ubicom32lcd_execute
* Executes a script for performing operations on the LCD (assumes CS set)
*/
static void ubicom32lcd_execute(struct ubicom32lcd_data *ud, const struct ubicom32lcd_step *script)
{
while (1) {
switch (script->op) {
case LCD_STEP_CMD:
ubicom32lcd_write(ud, 1, script->cmd);
break;
case LCD_STEP_DATA:
ubicom32lcd_write(ud, 0, script->data);
break;
case LCD_STEP_CMD_DATA:
ubicom32lcd_write(ud, 1, script->cmd);
ubicom32lcd_write(ud, 0, script->data);
break;
case LCD_STEP_SLEEP:
udelay(script->data);
break;
case LCD_STEP_DONE:
return;
}
script++;
}
}
/*
* ubicom32lcd_goto
* Places the gram pointer at a specific X, Y address
*/
static void ubicom32lcd_goto(struct ubicom32lcd_data *ud, int x, int y)
{
ubicom32lcd_write(ud, 1, ud->panel->horz_reg);
ubicom32lcd_write(ud, 0, x);
ubicom32lcd_write(ud, 1, ud->panel->vert_reg);
ubicom32lcd_write(ud, 0, y);
ubicom32lcd_write(ud, 1, ud->panel->gram_reg);
}
/*
* ubicom32lcd_panel_init
* Initializes the lcd panel.
*/
static int ubicom32lcd_panel_init(struct ubicom32lcd_data *ud)
{
u16 id;
UBICOM32_GPIO_SET_PIN_LOW(ud->pin_reset);
UBICOM32_GPIO_SET_PIN_OUTPUT(ud->pin_reset);
UBICOM32_GPIO_ENABLE(ud->pin_reset);
asm volatile (
"or.4 0x50(%[port]), 0x50(%[port]), %[mask] \n\t"
"not.4 %[mask], %[mask] \n\t"
"and.4 0x04(%[port]), 0x04(%[port]), %[mask] \n\t"
:
: [port] "a" (ud->port_data),
[mask] "d" (0xFFFF << ud->data_shift)
: "cc"
);
UBICOM32_GPIO_SET_PIN_HIGH(ud->pin_rs);
UBICOM32_GPIO_SET_PIN_HIGH(ud->pin_rd);
UBICOM32_GPIO_SET_PIN_HIGH(ud->pin_wr);
UBICOM32_GPIO_SET_PIN_HIGH(ud->pin_cs);
UBICOM32_GPIO_SET_PIN_OUTPUT(ud->pin_rs);
UBICOM32_GPIO_SET_PIN_OUTPUT(ud->pin_rd);
UBICOM32_GPIO_SET_PIN_OUTPUT(ud->pin_wr);
UBICOM32_GPIO_SET_PIN_OUTPUT(ud->pin_cs);
UBICOM32_GPIO_ENABLE(ud->pin_rs);
UBICOM32_GPIO_ENABLE(ud->pin_rd);
UBICOM32_GPIO_ENABLE(ud->pin_wr);
UBICOM32_GPIO_ENABLE(ud->pin_cs);
udelay(20);
UBICOM32_GPIO_SET_PIN_HIGH(ud->pin_reset);
udelay(20);
UBICOM32_GPIO_SET_PIN_LOW(ud->pin_cs);
id = ubicom32lcd_read_data(ud);
/*
* We will try to figure out what kind of panel we have if we were not told.
*/
if (!ud->panel) {
const struct ubicom32lcd_panel **p = ubicom32lcd_panels;
while (*p) {
if ((*p)->id && ((*p)->id == id)) {
break;
}
p++;
}
if (!*p) {
printk(KERN_WARNING DRIVER_NAME ":Could not find compatible panel, id=%x\n", id);
return -ENODEV;
}
ud->panel = *p;
}
/*
* Make sure panel ID matches if we were supplied a panel type
*/
if (ud->panel->id && (ud->panel->id != id)) {
UBICOM32_GPIO_SET_PIN_HIGH(ud->pin_cs);
return -ENODEV;
}
ubicom32lcd_execute(ud, ud->panel->init_seq);
ubicom32lcd_goto(ud, 0, 0);
UBICOM32_GPIO_SET_PIN_HIGH(ud->pin_cs);
UBICOM32_GPIO_SET_PIN_HIGH(ud->pin_rd);
UBICOM32_GPIO_SET_PIN_HIGH(ud->pin_wr);
UBICOM32_GPIO_SET_PIN_HIGH(ud->pin_rs);
printk(KERN_INFO DRIVER_NAME ": Initialized panel %s\n", ud->panel->desc);
return 0;
}
/*
* ubicom32lcd_probe
*/
static int ubicom32lcd_probe(struct platform_device *pdev)
{
const struct ubicom32lcd_platform_data *pdata = pdev->dev.platform_data;
struct ubicom32lcd_data *ud;
int retval;
/*
* Allocate our private data
*/
ud = kzalloc(sizeof(struct ubicom32lcd_data), GFP_KERNEL);
if (!ud) {
return -ENOMEM;
}
if (pdata) {
ud->pin_cs = pdata->pin_cs;
ud->pin_rd = pdata->pin_rd;
ud->pin_wr = pdata->pin_wr;
ud->pin_rs = pdata->pin_rs;
ud->pin_reset = pdata->pin_reset;
ud->port_data = pdata->port_data;
ud->data_shift = pdata->data_shift;
} else {
/*
* Defaults
*/
ud->pin_cs = GPIO_RD_4;
ud->pin_rd = GPIO_RD_5;
ud->pin_rs = GPIO_RD_3;
ud->pin_wr = GPIO_RD_2;
ud->pin_reset = GPIO_RD_7;
ud->port_data = (struct ubicom32_io_port *)RI;
ud->data_shift = 0;
}
/*
* Initialize the display
*/
retval = ubicom32lcd_panel_init(ud);
if (retval) {
kfree(ud);
return retval;
}
printk(KERN_INFO DRIVER_NAME ": LCD initialized\n");
return 0;
}
/*
* ubicom32lcd_remove
*/
static int __exit ubicom32lcd_remove(struct platform_device *pdev)
{
struct ubicom32lcd_data *ud = platform_get_drvdata(pdev);
kfree(ud);
return 0;
}
static struct platform_driver ubicom32lcd_driver = {
.probe = ubicom32lcd_probe,
.remove = ubicom32lcd_remove,
.driver = {
.name = DRIVER_NAME,
.owner = THIS_MODULE,
},
.remove = __exit_p(ubicom32lcd_remove),
};
static struct platform_device *ubicom32lcd_device;
/*
* ubicom32lcd_init
*/
static int __init ubicom32lcd_init(void)
{
int res;
res = platform_driver_register(&ubicom32lcd_driver);
if (res == 0) {
ubicom32lcd_device = platform_device_alloc(DRIVER_NAME, 0);
if (ubicom32lcd_device) {
res = platform_device_add(ubicom32lcd_device);
} else {
res = -ENOMEM;
}
if (res) {
platform_device_put(ubicom32lcd_device);
platform_driver_unregister(&ubicom32lcd_driver);
}
}
return res;
}
module_init(ubicom32lcd_init);
/*
* ubicom32lcd_exit
*/
static void __exit ubicom32lcd_exit(void)
{
platform_device_unregister(ubicom32lcd_device);
platform_driver_unregister(&ubicom32lcd_driver);
}
module_exit(ubicom32lcd_exit);
MODULE_AUTHOR("Patrick Tjin <@ubicom.com>");
MODULE_DESCRIPTION("Ubicom32 LCD driver");
MODULE_LICENSE("GPL");
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