+/*
+ * 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");
projects / linux-2.6-omap-h63xx.git / commitdiff