1 files changed, 372 insertions, 0 deletions
diff --git a/target/linux/ubicom32/files/drivers/video/backlight/ubicom32lcd.c b/target/linux/ubicom32/files/drivers/video/backlight/ubicom32lcd.c
new file mode 100644
index 000000000..e4f8c713e
--- /dev/null
+++ b/target/linux/ubicom32/files/drivers/video/backlight/ubicom32lcd.c
@@ -0,0 +1,372 @@
+/*
+ * drivers/video/ubicom32lcd.c
+ *	LCD initilization code
+ *
+ * (C) Copyright 2009, Ubicom, Inc.
+ *
+ * This file is part of the Ubicom32 Linux Kernel Port.
+ *
+ * The Ubicom32 Linux Kernel Port is free software: you can redistribute
+ * it and/or modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation, either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * The Ubicom32 Linux Kernel Port is distributed in the hope that it
+ * will be useful, but WITHOUT ANY WARRANTY; without even the implied
+ * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
+ * the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with the Ubicom32 Linux Kernel Port.  If not,
+ * see <http://www.gnu.org/licenses/>.
+ */
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/delay.h>
+
+#include <asm/ip5000.h>
+#include <asm/gpio.h>
+#include <asm/ubicom32lcd.h>
+
+#include "ubicom32lcd.h"
+
+#define DRIVER_NAME			"ubicom32lcd"
+
+struct ubicom32lcd_data {
+	const struct ubicom32lcd_panel	*panel;
+
+	int				pin_cs;
+	int				pin_rd;
+	int				pin_rs;
+	int				pin_wr;
+	int				pin_reset;
+	struct ubicom32_io_port		*port_data;
+	int				data_shift;
+};
+
+/*
+ * ubicom32lcd_write
+ *	Performs a write cycle on the bus (assumes CS asserted, RD & WR set)
+ */
+static void ubicom32lcd_write(struct ubicom32lcd_data *ud, int command, u16 data)
+{
+	if (command) {
+		UBICOM32_GPIO_SET_PIN_LOW(ud->pin_rs);
+	} else {
+		UBICOM32_GPIO_SET_PIN_HIGH(ud->pin_rs);
+	}
+
+	asm volatile (
+		"or.4	4(%[port]), 4(%[port]), %[mask]	\n\t"
+		"not.4	%[mask], %[mask]		\n\t"
+		"and.4	8(%[port]), 8(%[port]), %[mask]	\n\t"
+		"or.4	8(%[port]), 8(%[port]), %[cmd]	\n\t"
+		:
+		: [port] "a" (ud->port_data),
+		  [mask] "d" (0xFFFF << ud->data_shift),
+		  [cmd] "d" (data << ud->data_shift)
+		: "cc"
+	);
+
+	UBICOM32_GPIO_SET_PIN_LOW(ud->pin_wr);
+
+	//ndelay(50);
+	udelay(1);
+
+	UBICOM32_GPIO_SET_PIN_HIGH(ud->pin_wr);
+
+	udelay(1);
+	//ndelay(50);
+}
+
+/*
+ * ubicom32lcd_read_data
+ *	Performs a read cycle on the bus (assumes CS asserted, RD & WR set)
+ */
+static u16 ubicom32lcd_read_data(struct ubicom32lcd_data *ud)
+{
+	u32_t data;
+
+	UBICOM32_GPIO_SET_PIN_HIGH(ud->pin_rs);
+
+	asm volatile (
+		"and.4	4(%[port]), 4(%[port]), %[mask]\n\t"
+		:
+		: [port] "a" (ud->port_data),
+		  [mask] "d" (~(0xFFFF << ud->data_shift))
+		: "cc"
+	);
+
+	UBICOM32_GPIO_SET_PIN_LOW(ud->pin_rd);
+
+	ndelay(300);
+
+	asm volatile (
+		"lsr.4	%[data], 12(%[port]), %[shamt]	\n\t"
+		"and.4	%[data], %[data], %[mask]	\n\t"
+		: [data] "=d" (data)
+		: [port] "a" (ud->port_data),
+		  [mask] "d" (0xFFFF),
+		  [shamt] "d" (ud->data_shift)
+		: "cc"
+	);
+
+	ndelay(200);
+
+	UBICOM32_GPIO_SET_PIN_HIGH(ud->pin_rd);
+
+	ndelay(500);
+
+	return data;
+}
+
+/*
+ * ubicom32lcd_execute
+ *	Executes a script for performing operations on the LCD (assumes CS set)
+ */
+static void ubicom32lcd_execute(struct ubicom32lcd_data *ud, const struct ubicom32lcd_step *script)
+{
+	while (1) {
+		switch (script->op) {
+		case LCD_STEP_CMD:
+			ubicom32lcd_write(ud, 1, script->cmd);
+			break;
+
+		case LCD_STEP_DATA:
+			ubicom32lcd_write(ud, 0, script->data);
+			break;
+
+		case LCD_STEP_CMD_DATA:
+			ubicom32lcd_write(ud, 1, script->cmd);
+			ubicom32lcd_write(ud, 0, script->data);
+			break;
+
+		case LCD_STEP_SLEEP:
+			udelay(script->data);
+			break;
+
+		case LCD_STEP_DONE:
+			return;
+		}
+		script++;
+	}
+}
+
+/*
+ * ubicom32lcd_goto
+ *	Places the gram pointer at a specific X, Y address
+ */
+static void ubicom32lcd_goto(struct ubicom32lcd_data *ud, int x, int y)
+{
+	ubicom32lcd_write(ud, 1, ud->panel->horz_reg);
+	ubicom32lcd_write(ud, 0, x);
+	ubicom32lcd_write(ud, 1, ud->panel->vert_reg);
+	ubicom32lcd_write(ud, 0, y);
+	ubicom32lcd_write(ud, 1, ud->panel->gram_reg);
+}
+
+/*
+ * ubicom32lcd_panel_init
+ *	Initializes the lcd panel.
+ */
+static int ubicom32lcd_panel_init(struct ubicom32lcd_data *ud)
+{
+	u16 id;
+
+	UBICOM32_GPIO_SET_PIN_LOW(ud->pin_reset);
+	UBICOM32_GPIO_SET_PIN_OUTPUT(ud->pin_reset);
+	UBICOM32_GPIO_ENABLE(ud->pin_reset);
+
+	asm volatile (
+		"or.4	0x50(%[port]), 0x50(%[port]), %[mask]	\n\t"
+		"not.4	%[mask], %[mask]			\n\t"
+		"and.4	0x04(%[port]), 0x04(%[port]), %[mask]	\n\t"
+		:
+		: [port] "a" (ud->port_data),
+		  [mask] "d" (0xFFFF << ud->data_shift)
+		: "cc"
+	);
+
+	UBICOM32_GPIO_SET_PIN_HIGH(ud->pin_rs);
+	UBICOM32_GPIO_SET_PIN_HIGH(ud->pin_rd);
+	UBICOM32_GPIO_SET_PIN_HIGH(ud->pin_wr);
+	UBICOM32_GPIO_SET_PIN_HIGH(ud->pin_cs);
+
+	UBICOM32_GPIO_SET_PIN_OUTPUT(ud->pin_rs);
+	UBICOM32_GPIO_SET_PIN_OUTPUT(ud->pin_rd);
+	UBICOM32_GPIO_SET_PIN_OUTPUT(ud->pin_wr);
+	UBICOM32_GPIO_SET_PIN_OUTPUT(ud->pin_cs);
+
+	UBICOM32_GPIO_ENABLE(ud->pin_rs);
+	UBICOM32_GPIO_ENABLE(ud->pin_rd);
+	UBICOM32_GPIO_ENABLE(ud->pin_wr);
+	UBICOM32_GPIO_ENABLE(ud->pin_cs);
+
+	udelay(20);
+
+	UBICOM32_GPIO_SET_PIN_HIGH(ud->pin_reset);
+
+	udelay(20);
+
+	UBICOM32_GPIO_SET_PIN_LOW(ud->pin_cs);
+
+	id = ubicom32lcd_read_data(ud);
+
+	/*
+	 * We will try to figure out what kind of panel we have if we were not told.
+	 */
+	if (!ud->panel) {
+		const struct ubicom32lcd_panel **p = ubicom32lcd_panels;
+		while (*p) {
+			if ((*p)->id && ((*p)->id == id)) {
+				break;
+			}
+			p++;
+		}
+		if (!*p) {
+			printk(KERN_WARNING DRIVER_NAME ":Could not find compatible panel, id=%x\n", id);
+			return -ENODEV;
+		}
+		ud->panel = *p;
+	}
+
+	/*
+	 * Make sure panel ID matches if we were supplied a panel type
+	 */
+	if (ud->panel->id && (ud->panel->id != id)) {
+		UBICOM32_GPIO_SET_PIN_HIGH(ud->pin_cs);
+
+		return -ENODEV;
+	}
+
+	ubicom32lcd_execute(ud, ud->panel->init_seq);
+
+	ubicom32lcd_goto(ud, 0, 0);
+
+	UBICOM32_GPIO_SET_PIN_HIGH(ud->pin_cs);
+	UBICOM32_GPIO_SET_PIN_HIGH(ud->pin_rd);
+	UBICOM32_GPIO_SET_PIN_HIGH(ud->pin_wr);
+	UBICOM32_GPIO_SET_PIN_HIGH(ud->pin_rs);
+
+	printk(KERN_INFO DRIVER_NAME ": Initialized panel %s\n", ud->panel->desc);
+
+	return 0;
+}
+
+/*
+ * ubicom32lcd_probe
+ */
+static int ubicom32lcd_probe(struct platform_device *pdev)
+{
+	const struct ubicom32lcd_platform_data *pdata = pdev->dev.platform_data;
+	struct ubicom32lcd_data *ud;
+	int retval;
+
+	/*
+	 * Allocate our private data
+	 */
+	ud = kzalloc(sizeof(struct ubicom32lcd_data), GFP_KERNEL);
+	if (!ud) {
+		return -ENOMEM;
+	}
+
+	if (pdata) {
+		ud->pin_cs = pdata->pin_cs;
+		ud->pin_rd = pdata->pin_rd;
+		ud->pin_wr = pdata->pin_wr;
+		ud->pin_rs = pdata->pin_rs;
+		ud->pin_reset = pdata->pin_reset;
+		ud->port_data = pdata->port_data;
+		ud->data_shift = pdata->data_shift;
+	} else {
+		/*
+		 * Defaults
+		 */
+		ud->pin_cs = GPIO_RD_4;
+		ud->pin_rd = GPIO_RD_5;
+		ud->pin_rs = GPIO_RD_3;
+		ud->pin_wr = GPIO_RD_2;
+		ud->pin_reset = GPIO_RD_7;
+		ud->port_data = (struct ubicom32_io_port *)RI;
+		ud->data_shift = 0;
+	}
+
+	/*
+	 * Initialize the display
+	 */
+	retval = ubicom32lcd_panel_init(ud);
+	if (retval) {
+		kfree(ud);
+		return retval;
+	}
+
+	printk(KERN_INFO DRIVER_NAME ": LCD initialized\n");
+
+	return 0;
+}
+
+/*
+ * ubicom32lcd_remove
+ */
+static int __exit ubicom32lcd_remove(struct platform_device *pdev)
+{
+	struct ubicom32lcd_data *ud = platform_get_drvdata(pdev);
+
+	kfree(ud);
+
+	return 0;
+}
+
+static struct platform_driver ubicom32lcd_driver = {
+	.probe          = ubicom32lcd_probe,
+	.remove         = ubicom32lcd_remove,
+
+	.driver = {
+		.name = DRIVER_NAME,
+		.owner = THIS_MODULE,
+	},
+
+	.remove = __exit_p(ubicom32lcd_remove),
+};
+
+static struct platform_device *ubicom32lcd_device;
+
+/*
+ * ubicom32lcd_init
+ */
+static int __init ubicom32lcd_init(void)
+{
+	int res;
+
+	res = platform_driver_register(&ubicom32lcd_driver);
+	if (res == 0) {
+		ubicom32lcd_device = platform_device_alloc(DRIVER_NAME, 0);
+		if (ubicom32lcd_device) {
+			res = platform_device_add(ubicom32lcd_device);
+		} else {
+			res = -ENOMEM;
+		}
+		if (res) {
+			platform_device_put(ubicom32lcd_device);
+			platform_driver_unregister(&ubicom32lcd_driver);
+		}
+	}
+	return res;
+}
+module_init(ubicom32lcd_init);
+
+/*
+ * ubicom32lcd_exit
+ */
+static void __exit ubicom32lcd_exit(void)
+{
+	platform_device_unregister(ubicom32lcd_device);
+	platform_driver_unregister(&ubicom32lcd_driver);
+}
+module_exit(ubicom32lcd_exit);
+
+MODULE_AUTHOR("Patrick Tjin <@ubicom.com>");
+MODULE_DESCRIPTION("Ubicom32 LCD driver");
+MODULE_LICENSE("GPL");