1 files changed, 295 insertions, 0 deletions

diff --git a/drivers/video/am200epd.c b/drivers/video/am200epd.c
new file mode 100644
index 000000000000..51e26c1f5e8b
--- /dev/null
+++ b/drivers/video/am200epd.c
@@ -0,0 +1,295 @@
+/*
+ * 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");