From 57f0f512b273f60d52568b8c6b77e17f5636edc0 Mon Sep 17 00:00:00 2001
From: André Fabian Silva Delgado <emulatorman@parabola.nu>
Date: Wed, 5 Aug 2015 17:04:01 -0300
Subject: Initial import

---
 arch/arm/mach-pxa/am300epd.c | 296 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 296 insertions(+)
 create mode 100644 arch/arm/mach-pxa/am300epd.c

(limited to 'arch/arm/mach-pxa/am300epd.c')

diff --git a/arch/arm/mach-pxa/am300epd.c b/arch/arm/mach-pxa/am300epd.c
new file mode 100644
index 000000000..8b90c4f2d
--- /dev/null
+++ b/arch/arm/mach-pxa/am300epd.c
@@ -0,0 +1,296 @@
+/*
+ * am300epd.c -- Platform device for AM300 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.
+ *
+ * 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 Broadsheet display controller.
+ * on the AM300 EPD prototype kit/development kit with an E-Ink 800x600
+ * Vizplex EPD on a Gumstix board using the Broadsheet 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/irq.h>
+#include <linux/gpio.h>
+
+#include <mach/gumstix.h>
+#include <mach/mfp-pxa25x.h>
+#include <mach/irqs.h>
+#include <linux/platform_data/video-pxafb.h>
+
+#include "generic.h"
+
+#include <video/broadsheetfb.h>
+
+static unsigned int panel_type = 6;
+static struct platform_device *am300_device;
+static struct broadsheet_board am300_board;
+
+static unsigned long am300_pin_config[] __initdata = {
+	GPIO16_GPIO,
+	GPIO17_GPIO,
+	GPIO32_GPIO,
+	GPIO48_GPIO,
+	GPIO49_GPIO,
+	GPIO51_GPIO,
+	GPIO74_GPIO,
+	GPIO75_GPIO,
+	GPIO76_GPIO,
+	GPIO77_GPIO,
+
+	/* this is the 16-bit hdb bus 58-73 */
+	GPIO58_GPIO,
+	GPIO59_GPIO,
+	GPIO60_GPIO,
+	GPIO61_GPIO,
+
+	GPIO62_GPIO,
+	GPIO63_GPIO,
+	GPIO64_GPIO,
+	GPIO65_GPIO,
+
+	GPIO66_GPIO,
+	GPIO67_GPIO,
+	GPIO68_GPIO,
+	GPIO69_GPIO,
+
+	GPIO70_GPIO,
+	GPIO71_GPIO,
+	GPIO72_GPIO,
+	GPIO73_GPIO,
+};
+
+/* register offsets for gpio control */
+#define PWR_GPIO_PIN	16
+#define CFG_GPIO_PIN	17
+#define RDY_GPIO_PIN	32
+#define DC_GPIO_PIN	48
+#define RST_GPIO_PIN	49
+#define LED_GPIO_PIN	51
+#define RD_GPIO_PIN	74
+#define WR_GPIO_PIN	75
+#define CS_GPIO_PIN	76
+#define IRQ_GPIO_PIN	77
+
+/* hdb bus */
+#define DB0_GPIO_PIN	58
+#define DB15_GPIO_PIN	73
+
+static int gpios[] = { PWR_GPIO_PIN, CFG_GPIO_PIN, RDY_GPIO_PIN, DC_GPIO_PIN,
+			RST_GPIO_PIN, RD_GPIO_PIN, WR_GPIO_PIN, CS_GPIO_PIN,
+			IRQ_GPIO_PIN, LED_GPIO_PIN };
+static char *gpio_names[] = { "PWR", "CFG", "RDY", "DC", "RST", "RD", "WR",
+				"CS", "IRQ", "LED" };
+
+static int am300_wait_event(struct broadsheetfb_par *par)
+{
+	/* todo: improve err recovery */
+	wait_event(par->waitq, gpio_get_value(RDY_GPIO_PIN));
+	return 0;
+}
+
+static int am300_init_gpio_regs(struct broadsheetfb_par *par)
+{
+	int i;
+	int err;
+	char dbname[8];
+
+	for (i = 0; i < ARRAY_SIZE(gpios); i++) {
+		err = gpio_request(gpios[i], gpio_names[i]);
+		if (err) {
+			dev_err(&am300_device->dev, "failed requesting "
+				"gpio %s, err=%d\n", gpio_names[i], err);
+			goto err_req_gpio;
+		}
+	}
+
+	/* we also need to take care of the hdb bus */
+	for (i = DB0_GPIO_PIN; i <= DB15_GPIO_PIN; i++) {
+		sprintf(dbname, "DB%d", i);
+		err = gpio_request(i, dbname);
+		if (err) {
+			dev_err(&am300_device->dev, "failed requesting "
+				"gpio %d, err=%d\n", i, err);
+			goto err_req_gpio2;
+		}
+	}
+
+	/* setup the outputs and init values */
+	gpio_direction_output(PWR_GPIO_PIN, 0);
+	gpio_direction_output(CFG_GPIO_PIN, 1);
+	gpio_direction_output(DC_GPIO_PIN, 0);
+	gpio_direction_output(RD_GPIO_PIN, 1);
+	gpio_direction_output(WR_GPIO_PIN, 1);
+	gpio_direction_output(CS_GPIO_PIN, 1);
+	gpio_direction_output(RST_GPIO_PIN, 0);
+
+	/* setup the inputs */
+	gpio_direction_input(RDY_GPIO_PIN);
+	gpio_direction_input(IRQ_GPIO_PIN);
+
+	/* start the hdb bus as an input */
+	for (i = DB0_GPIO_PIN; i <= DB15_GPIO_PIN; i++)
+		gpio_direction_output(i, 0);
+
+	/* go into command mode */
+	gpio_set_value(CFG_GPIO_PIN, 1);
+	gpio_set_value(RST_GPIO_PIN, 0);
+	msleep(10);
+	gpio_set_value(RST_GPIO_PIN, 1);
+	msleep(10);
+	am300_wait_event(par);
+
+	return 0;
+
+err_req_gpio2:
+	while (--i >= DB0_GPIO_PIN)
+		gpio_free(i);
+	i = ARRAY_SIZE(gpios);
+err_req_gpio:
+	while (--i >= 0)
+		gpio_free(gpios[i]);
+
+	return err;
+}
+
+static int am300_init_board(struct broadsheetfb_par *par)
+{
+	return am300_init_gpio_regs(par);
+}
+
+static void am300_cleanup(struct broadsheetfb_par *par)
+{
+	int i;
+
+	free_irq(PXA_GPIO_TO_IRQ(RDY_GPIO_PIN), par);
+
+	for (i = 0; i < ARRAY_SIZE(gpios); i++)
+		gpio_free(gpios[i]);
+
+	for (i = DB0_GPIO_PIN; i <= DB15_GPIO_PIN; i++)
+		gpio_free(i);
+
+}
+
+static u16 am300_get_hdb(struct broadsheetfb_par *par)
+{
+	u16 res = 0;
+	int i;
+
+	for (i = 0; i <= (DB15_GPIO_PIN - DB0_GPIO_PIN) ; i++)
+		res |= (gpio_get_value(DB0_GPIO_PIN + i)) ? (1 << i) : 0;
+
+	return res;
+}
+
+static void am300_set_hdb(struct broadsheetfb_par *par, u16 data)
+{
+	int i;
+
+	for (i = 0; i <= (DB15_GPIO_PIN - DB0_GPIO_PIN) ; i++)
+		gpio_set_value(DB0_GPIO_PIN + i, (data >> i) & 0x01);
+}
+
+
+static void am300_set_ctl(struct broadsheetfb_par *par, unsigned char bit,
+				u8 state)
+{
+	switch (bit) {
+	case BS_CS:
+		gpio_set_value(CS_GPIO_PIN, state);
+		break;
+	case BS_DC:
+		gpio_set_value(DC_GPIO_PIN, state);
+		break;
+	case BS_WR:
+		gpio_set_value(WR_GPIO_PIN, state);
+		break;
+	}
+}
+
+static int am300_get_panel_type(void)
+{
+	return panel_type;
+}
+
+static irqreturn_t am300_handle_irq(int irq, void *dev_id)
+{
+	struct broadsheetfb_par *par = dev_id;
+
+	wake_up(&par->waitq);
+	return IRQ_HANDLED;
+}
+
+static int am300_setup_irq(struct fb_info *info)
+{
+	int ret;
+	struct broadsheetfb_par *par = info->par;
+
+	ret = request_irq(PXA_GPIO_TO_IRQ(RDY_GPIO_PIN), am300_handle_irq,
+				IRQF_TRIGGER_RISING, "AM300", par);
+	if (ret)
+		dev_err(&am300_device->dev, "request_irq failed: %d\n", ret);
+
+	return ret;
+}
+
+static struct broadsheet_board am300_board = {
+	.owner			= THIS_MODULE,
+	.init			= am300_init_board,
+	.cleanup		= am300_cleanup,
+	.set_hdb		= am300_set_hdb,
+	.get_hdb		= am300_get_hdb,
+	.set_ctl		= am300_set_ctl,
+	.wait_for_rdy		= am300_wait_event,
+	.get_panel_type		= am300_get_panel_type,
+	.setup_irq		= am300_setup_irq,
+};
+
+int __init am300_init(void)
+{
+	int ret;
+
+	pxa2xx_mfp_config(ARRAY_AND_SIZE(am300_pin_config));
+
+	/* request our platform independent driver */
+	request_module("broadsheetfb");
+
+	am300_device = platform_device_alloc("broadsheetfb", -1);
+	if (!am300_device)
+		return -ENOMEM;
+
+	/* the am300_board that will be seen by broadsheetfb is a copy */
+	platform_device_add_data(am300_device, &am300_board,
+					sizeof(am300_board));
+
+	ret = platform_device_add(am300_device);
+
+	if (ret) {
+		platform_device_put(am300_device);
+		return ret;
+	}
+
+	return 0;
+}
+
+module_param(panel_type, uint, 0);
+MODULE_PARM_DESC(panel_type, "Select the panel type: 37, 6, 97");
+
+MODULE_DESCRIPTION("board driver for am300 epd kit");
+MODULE_AUTHOR("Jaya Kumar");
+MODULE_LICENSE("GPL");
-- 
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