/*
* linux/drivers/video/am200epd.c -- Platform device for AM200 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 work was made possible by help and equipment support from E-Ink
* Corporation. http://support.eink.com/community
*
* This driver is written to be used with the Metronome display controller.
* on the AM200 EPD prototype kit/development kit with an E-Ink 800x600
* Vizplex EPD on a Gumstix board using the Lyre interface board.
*
*/
#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/metronomefb.h>
#include <asm/arch/pxa-regs.h>
/* register offsets for gpio control */
#define LED_GPIO_PIN 51
#define STDBY_GPIO_PIN 48
#define RST_GPIO_PIN 49
#define RDY_GPIO_PIN 32
#define ERR_GPIO_PIN 17
#define PCBPWR_GPIO_PIN 16
#define AF_SEL_GPIO_N 0x3
#define GAFR0_U_OFFSET(pin) ((pin - 16) * 2)
#define GAFR1_L_OFFSET(pin) ((pin - 32) * 2)
#define GAFR1_U_OFFSET(pin) ((pin - 48) * 2)
#define GPDR1_OFFSET(pin) (pin - 32)
#define GPCR1_OFFSET(pin) (pin - 32)
#define GPSR1_OFFSET(pin) (pin - 32)
#define GPCR0_OFFSET(pin) (pin)
#define GPSR0_OFFSET(pin) (pin)
static void am200_set_gpio_output(int pin, int val)
{
u8 index;
index = pin >> 4;
switch (index) {
case 1:
if (val)
GPSR0 |= (1 << GPSR0_OFFSET(pin));
else
GPCR0 |= (1 << GPCR0_OFFSET(pin));
break;
case 2:
break;
case 3:
if (val)
GPSR1 |= (1 << GPSR1_OFFSET(pin));
else
GPCR1 |= (1 << GPCR1_OFFSET(pin));
break;
default:
printk(KERN_ERR "unimplemented\n");
}
}
static void __devinit am200_init_gpio_pin(int pin, int dir)
{
u8 index;
/* dir 0 is output, 1 is input
- do 2 things here:
- set gpio alternate function to standard gpio
- set gpio direction to input or output */
index = pin >> 4;
switch (index) {
case 1:
GAFR0_U &= ~(AF_SEL_GPIO_N << GAFR0_U_OFFSET(pin));
if (dir)
GPDR0 &= ~(1 << pin);
else
GPDR0 |= (1 << pin);
break;
case 2:
GAFR1_L &= ~(AF_SEL_GPIO_N << GAFR1_L_OFFSET(pin));
if (dir)
GPDR1 &= ~(1 << GPDR1_OFFSET(pin));
else
GPDR1 |= (1 << GPDR1_OFFSET(pin));
break;
case 3:
GAFR1_U &= ~(AF_SEL_GPIO_N << GAFR1_U_OFFSET(pin));
if (dir)
GPDR1 &= ~(1 << GPDR1_OFFSET(pin));
else
GPDR1 |= (1 << GPDR1_OFFSET(pin));
break;
default:
printk(KERN_ERR "unimplemented\n");
}
}
static void am200_init_gpio_regs(struct metronomefb_par *par)
{
am200_init_gpio_pin(LED_GPIO_PIN, 0);
am200_set_gpio_output(LED_GPIO_PIN, 0);
am200_init_gpio_pin(STDBY_GPIO_PIN, 0);
am200_set_gpio_output(STDBY_GPIO_PIN, 0);
am200_init_gpio_pin(RST_GPIO_PIN, 0);
am200_set_gpio_output(RST_GPIO_PIN, 0);
am200_init_gpio_pin(RDY_GPIO_PIN, 1);
am200_init_gpio_pin(ERR_GPIO_PIN, 1);
am200_init_gpio_pin(PCBPWR_GPIO_PIN, 0);
am200_set_gpio_output(PCBPWR_GPIO_PIN, 0);
}
static void am200_disable_lcd_controller(struct metronomefb_par *par)
{
LCSR = 0xffffffff; /* Clear LCD Status Register */
LCCR0 |= LCCR0_DIS; /* Disable LCD Controller */
/* we reset and just wait for things to settle */
msleep(200);
}
static void am200_enable_lcd_controller(struct metronomefb_par *par)
{
LCSR = 0xffffffff;
FDADR0 = par->metromem_desc_dma;
LCCR0 |= LCCR0_ENB;
}
static void am200_init_lcdc_regs(struct metronomefb_par *par)
{
/* here we do:
- disable the lcd controller
- setup lcd control registers
- setup dma descriptor
- reenable lcd controller
*/
/* disable the lcd controller */
am200_disable_lcd_controller(par);
/* setup lcd control registers */
LCCR0 = LCCR0_LDM | LCCR0_SFM | LCCR0_IUM | LCCR0_EFM | LCCR0_PAS
| LCCR0_QDM | LCCR0_BM | LCCR0_OUM;
LCCR1 = (par->info->var.xres/2 - 1) /* pixels per line */
| (27 << 10) /* hsync pulse width - 1 */
| (33 << 16) /* eol pixel count */
| (33 << 24); /* bol pixel count */
LCCR2 = (par->info->var.yres - 1) /* lines per panel */
| (24 << 10) /* vsync pulse width - 1 */
| (2 << 16) /* eof pixel count */
| (0 << 24); /* bof pixel count */
LCCR3 = 2 /* pixel clock divisor */
| (24 << 8) /* AC Bias pin freq */
| LCCR3_16BPP /* BPP */
| LCCR3_PCP; /* PCP falling edge */
}
static void am200_post_dma_setup(struct metronomefb_par *par)
{
par->metromem_desc->mFDADR0 = par->metromem_desc_dma;
par->metromem_desc->mFSADR0 = par->metromem_dma;
par->metromem_desc->mFIDR0 = 0;
par->metromem_desc->mLDCMD0 = par->info->var.xres
* par->info->var.yres;
am200_enable_lcd_controller(par);
}
static void am200_free_irq(struct fb_info *info)
{
free_irq(IRQ_GPIO(RDY_GPIO_PIN), info);
}
static irqreturn_t am200_handle_irq(int irq, void *dev_id)
{
struct fb_info *info = dev_id;
struct metronomefb_par *par = info->par;
wake_up_interruptible(&par->waitq);
return IRQ_HANDLED;
}
static int am200_setup_irq(struct fb_info *info)
{
int retval;
retval = request_irq(IRQ_GPIO(RDY_GPIO_PIN), am200_handle_irq,
IRQF_DISABLED, "AM200", info);
if (retval) {
printk(KERN_ERR "am200epd: request_irq failed: %d\n", retval);
return retval;
}
return set_irq_type(IRQ_GPIO(RDY_GPIO_PIN), IRQT_FALLING);
}
static void am200_set_rst(struct metronomefb_par *par, int state)
{
am200_set_gpio_output(RST_GPIO_PIN, state);
}
static void am200_set_stdby(struct metronomefb_par *par, int state)
{
am200_set_gpio_output(STDBY_GPIO_PIN, state);
}
static int am200_wait_event(struct metronomefb_par *par)
{
return wait_event_timeout(par->waitq, (GPLR1 & 0x01), HZ);
}
static int am200_wait_event_intr(struct metronomefb_par *par)
{
return wait_event_interruptible_timeout(par->waitq, (GPLR1 & 0x01), HZ);
}
static struct metronome_board am200_board = {
.owner = THIS_MODULE,
.free_irq = am200_free_irq,
.setup_irq = am200_setup_irq,
.init_gpio_regs = am200_init_gpio_regs,
.init_lcdc_regs = am200_init_lcdc_regs,
.post_dma_setup = am200_post_dma_setup,
.set_rst = am200_set_rst,
.set_stdby = am200_set_stdby,
.met_wait_event = am200_wait_event,
.met_wait_event_intr = am200_wait_event_intr,
};
static struct platform_device *am200_device;
static int __init am200_init(void)
{
int ret;
/* request our platform independent driver */
request_module("metronomefb");
am200_device = platform_device_alloc("metronomefb", -1);
if (!am200_device)
return -ENOMEM;
platform_device_add_data(am200_device, &am200_board,
sizeof(am200_board));
/* this _add binds metronomefb to am200. metronomefb refcounts am200 */
ret = platform_device_add(am200_device);
if (ret)
platform_device_put(am200_device);
return ret;
}
static void __exit am200_exit(void)
{
platform_device_unregister(am200_device);
}
module_init(am200_init);
module_exit(am200_exit);
MODULE_DESCRIPTION("board driver for am200 metronome epd kit");
MODULE_AUTHOR("Jaya Kumar");
MODULE_LICENSE("GPL");
