/* * 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), IRQ_TYPE_EDGE_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");