a09e64fbc0
This just leaves include/asm-arm/plat-* to deal with. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
295 lines
7 KiB
C
295 lines
7 KiB
C
/*
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* linux/drivers/video/am200epd.c -- Platform device for AM200 EPD kit
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*
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* Copyright (C) 2008, Jaya Kumar
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file COPYING in the main directory of this archive for
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* more details.
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*
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* Layout is based on skeletonfb.c by James Simmons and Geert Uytterhoeven.
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*
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* This work was made possible by help and equipment support from E-Ink
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* Corporation. http://support.eink.com/community
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*
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* This driver is written to be used with the Metronome display controller.
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* on the AM200 EPD prototype kit/development kit with an E-Ink 800x600
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* Vizplex EPD on a Gumstix board using the Lyre interface board.
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*
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/string.h>
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#include <linux/delay.h>
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#include <linux/interrupt.h>
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#include <linux/fb.h>
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#include <linux/init.h>
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#include <linux/platform_device.h>
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#include <linux/list.h>
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#include <linux/uaccess.h>
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#include <linux/irq.h>
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#include <video/metronomefb.h>
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#include <mach/pxa-regs.h>
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/* register offsets for gpio control */
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#define LED_GPIO_PIN 51
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#define STDBY_GPIO_PIN 48
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#define RST_GPIO_PIN 49
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#define RDY_GPIO_PIN 32
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#define ERR_GPIO_PIN 17
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#define PCBPWR_GPIO_PIN 16
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#define AF_SEL_GPIO_N 0x3
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#define GAFR0_U_OFFSET(pin) ((pin - 16) * 2)
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#define GAFR1_L_OFFSET(pin) ((pin - 32) * 2)
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#define GAFR1_U_OFFSET(pin) ((pin - 48) * 2)
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#define GPDR1_OFFSET(pin) (pin - 32)
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#define GPCR1_OFFSET(pin) (pin - 32)
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#define GPSR1_OFFSET(pin) (pin - 32)
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#define GPCR0_OFFSET(pin) (pin)
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#define GPSR0_OFFSET(pin) (pin)
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static void am200_set_gpio_output(int pin, int val)
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{
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u8 index;
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index = pin >> 4;
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switch (index) {
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case 1:
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if (val)
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GPSR0 |= (1 << GPSR0_OFFSET(pin));
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else
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GPCR0 |= (1 << GPCR0_OFFSET(pin));
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break;
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case 2:
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break;
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case 3:
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if (val)
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GPSR1 |= (1 << GPSR1_OFFSET(pin));
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else
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GPCR1 |= (1 << GPCR1_OFFSET(pin));
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break;
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default:
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printk(KERN_ERR "unimplemented\n");
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}
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}
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static void __devinit am200_init_gpio_pin(int pin, int dir)
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{
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u8 index;
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/* dir 0 is output, 1 is input
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- do 2 things here:
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- set gpio alternate function to standard gpio
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- set gpio direction to input or output */
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index = pin >> 4;
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switch (index) {
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case 1:
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GAFR0_U &= ~(AF_SEL_GPIO_N << GAFR0_U_OFFSET(pin));
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if (dir)
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GPDR0 &= ~(1 << pin);
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else
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GPDR0 |= (1 << pin);
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break;
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case 2:
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GAFR1_L &= ~(AF_SEL_GPIO_N << GAFR1_L_OFFSET(pin));
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if (dir)
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GPDR1 &= ~(1 << GPDR1_OFFSET(pin));
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else
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GPDR1 |= (1 << GPDR1_OFFSET(pin));
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break;
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case 3:
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GAFR1_U &= ~(AF_SEL_GPIO_N << GAFR1_U_OFFSET(pin));
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if (dir)
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GPDR1 &= ~(1 << GPDR1_OFFSET(pin));
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else
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GPDR1 |= (1 << GPDR1_OFFSET(pin));
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break;
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default:
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printk(KERN_ERR "unimplemented\n");
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}
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}
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static void am200_init_gpio_regs(struct metronomefb_par *par)
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{
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am200_init_gpio_pin(LED_GPIO_PIN, 0);
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am200_set_gpio_output(LED_GPIO_PIN, 0);
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am200_init_gpio_pin(STDBY_GPIO_PIN, 0);
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am200_set_gpio_output(STDBY_GPIO_PIN, 0);
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am200_init_gpio_pin(RST_GPIO_PIN, 0);
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am200_set_gpio_output(RST_GPIO_PIN, 0);
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am200_init_gpio_pin(RDY_GPIO_PIN, 1);
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am200_init_gpio_pin(ERR_GPIO_PIN, 1);
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am200_init_gpio_pin(PCBPWR_GPIO_PIN, 0);
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am200_set_gpio_output(PCBPWR_GPIO_PIN, 0);
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}
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static void am200_disable_lcd_controller(struct metronomefb_par *par)
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{
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LCSR = 0xffffffff; /* Clear LCD Status Register */
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LCCR0 |= LCCR0_DIS; /* Disable LCD Controller */
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/* we reset and just wait for things to settle */
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msleep(200);
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}
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static void am200_enable_lcd_controller(struct metronomefb_par *par)
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{
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LCSR = 0xffffffff;
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FDADR0 = par->metromem_desc_dma;
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LCCR0 |= LCCR0_ENB;
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}
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static void am200_init_lcdc_regs(struct metronomefb_par *par)
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{
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/* here we do:
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- disable the lcd controller
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- setup lcd control registers
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- setup dma descriptor
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- reenable lcd controller
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*/
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/* disable the lcd controller */
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am200_disable_lcd_controller(par);
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/* setup lcd control registers */
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LCCR0 = LCCR0_LDM | LCCR0_SFM | LCCR0_IUM | LCCR0_EFM | LCCR0_PAS
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| LCCR0_QDM | LCCR0_BM | LCCR0_OUM;
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LCCR1 = (par->info->var.xres/2 - 1) /* pixels per line */
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| (27 << 10) /* hsync pulse width - 1 */
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| (33 << 16) /* eol pixel count */
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| (33 << 24); /* bol pixel count */
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LCCR2 = (par->info->var.yres - 1) /* lines per panel */
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| (24 << 10) /* vsync pulse width - 1 */
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| (2 << 16) /* eof pixel count */
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| (0 << 24); /* bof pixel count */
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LCCR3 = 2 /* pixel clock divisor */
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| (24 << 8) /* AC Bias pin freq */
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| LCCR3_16BPP /* BPP */
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| LCCR3_PCP; /* PCP falling edge */
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}
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static void am200_post_dma_setup(struct metronomefb_par *par)
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{
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par->metromem_desc->mFDADR0 = par->metromem_desc_dma;
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par->metromem_desc->mFSADR0 = par->metromem_dma;
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par->metromem_desc->mFIDR0 = 0;
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par->metromem_desc->mLDCMD0 = par->info->var.xres
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* par->info->var.yres;
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am200_enable_lcd_controller(par);
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}
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static void am200_free_irq(struct fb_info *info)
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{
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free_irq(IRQ_GPIO(RDY_GPIO_PIN), info);
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}
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static irqreturn_t am200_handle_irq(int irq, void *dev_id)
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{
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struct fb_info *info = dev_id;
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struct metronomefb_par *par = info->par;
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wake_up_interruptible(&par->waitq);
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return IRQ_HANDLED;
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}
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static int am200_setup_irq(struct fb_info *info)
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{
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int retval;
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retval = request_irq(IRQ_GPIO(RDY_GPIO_PIN), am200_handle_irq,
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IRQF_DISABLED, "AM200", info);
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if (retval) {
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printk(KERN_ERR "am200epd: request_irq failed: %d\n", retval);
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return retval;
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}
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return set_irq_type(IRQ_GPIO(RDY_GPIO_PIN), IRQ_TYPE_EDGE_FALLING);
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}
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static void am200_set_rst(struct metronomefb_par *par, int state)
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{
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am200_set_gpio_output(RST_GPIO_PIN, state);
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}
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static void am200_set_stdby(struct metronomefb_par *par, int state)
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{
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am200_set_gpio_output(STDBY_GPIO_PIN, state);
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}
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static int am200_wait_event(struct metronomefb_par *par)
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{
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return wait_event_timeout(par->waitq, (GPLR1 & 0x01), HZ);
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}
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static int am200_wait_event_intr(struct metronomefb_par *par)
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{
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return wait_event_interruptible_timeout(par->waitq, (GPLR1 & 0x01), HZ);
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}
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static struct metronome_board am200_board = {
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.owner = THIS_MODULE,
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.free_irq = am200_free_irq,
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.setup_irq = am200_setup_irq,
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.init_gpio_regs = am200_init_gpio_regs,
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.init_lcdc_regs = am200_init_lcdc_regs,
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.post_dma_setup = am200_post_dma_setup,
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.set_rst = am200_set_rst,
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.set_stdby = am200_set_stdby,
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.met_wait_event = am200_wait_event,
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.met_wait_event_intr = am200_wait_event_intr,
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};
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static struct platform_device *am200_device;
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static int __init am200_init(void)
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{
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int ret;
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/* request our platform independent driver */
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request_module("metronomefb");
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am200_device = platform_device_alloc("metronomefb", -1);
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if (!am200_device)
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return -ENOMEM;
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platform_device_add_data(am200_device, &am200_board,
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sizeof(am200_board));
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/* this _add binds metronomefb to am200. metronomefb refcounts am200 */
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ret = platform_device_add(am200_device);
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if (ret)
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platform_device_put(am200_device);
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return ret;
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}
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static void __exit am200_exit(void)
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{
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platform_device_unregister(am200_device);
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}
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module_init(am200_init);
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module_exit(am200_exit);
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MODULE_DESCRIPTION("board driver for am200 metronome epd kit");
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MODULE_AUTHOR("Jaya Kumar");
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MODULE_LICENSE("GPL");
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