[xburst] Add support for the n516

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@19987 3c298f89-4303-0410-b956-a3cf2f4a3e73

1 files changed, 395 insertions, 0 deletions

diff --git a/target/linux/xburst/files-2.6.32/arch/mips/jz4740/board-n516-display.c b/target/linux/xburst/files-2.6.32/arch/mips/jz4740/board-n516-display.c
new file mode 100644
index 000000000..a0485da20
--- /dev/null
+++ b/target/linux/xburst/files-2.6.32/arch/mips/jz4740/board-n516-display.c
@@ -0,0 +1,395 @@
+/*
+ * board-n516-display.c -- Platform device for N516 display
+ *
+ * Copyright (C) 2009, Yauhen Kharuzhy <jekhor@gmail.com>
+ *
+ * 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.
+ */
+
+#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 <linux/jz4740_fb.h>
+
+#include <asm/mach-jz4740/platform.h>
+#include <asm/mach-jz4740/board-n516.h>
+
+#include <video/metronomefb.h>
+#include <linux/console.h>
+
+extern struct platform_device jz_lcd_device;
+
+static struct fb_videomode n516_fb_modes[] = {
+	[0] = {
+		.name		= "Metronome 800x600",
+		.refresh	= 50,
+		.xres		= 400,
+		.yres		= 624,
+		.hsync_len	= 31,
+		.vsync_len	= 23,
+		.right_margin	= 31,
+		.left_margin	= 5,
+		.upper_margin	= 1,
+		.lower_margin	= 2,
+		.sync = FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
+	},
+};
+
+static struct jz4740_fb_platform_data n516_fb_pdata = {
+	.num_modes	= ARRAY_SIZE(n516_fb_modes),
+	.modes		= n516_fb_modes,
+	.bpp		= 16,
+	.lcd_type	= JZ_LCD_TYPE_GENERIC_16_BIT,
+};
+
+struct n516_board_info {
+	uint8_t *metromem;
+	size_t wfm_size;
+	struct fb_info *host_fbinfo; /* the host LCD controller's fbi */
+	unsigned int fw;
+	unsigned int fh;
+};
+
+static struct platform_device *n516_device;
+static struct n516_board_info n516_board_info;
+
+static int metronome_gpios[] = {
+	GPIO_DISPLAY_STBY,
+	GPIO_DISPLAY_RST_L,
+	GPIO_DISPLAY_RDY,
+	GPIO_DISPLAY_ERR,
+/*	GPIO_DISPLAY_OFF,*/
+};
+
+static const char *metronome_gpio_names[] = {
+	"Metronome STDBY",
+	"Metronome RST",
+	"Metronome RDY",
+	"Metronome ERR",
+/*	"Metronone OFF",*/
+};
+
+static int n516_enable_hostfb(bool enable)
+{
+	int ret;
+	int blank = enable ? FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN;
+
+	acquire_console_sem();
+	ret = fb_blank(n516_board_info.host_fbinfo, blank);
+	release_console_sem();
+
+	return ret;
+}
+
+static int n516_init_metronome_gpios(struct metronomefb_par *par)
+{
+	int i;
+	int ret;
+
+	for (i = 0; i < ARRAY_SIZE(metronome_gpios); ++i) {
+		ret = gpio_request(metronome_gpios[i], metronome_gpio_names[i]);
+		if (ret)
+			goto err;
+	}
+
+	gpio_direction_output(GPIO_DISPLAY_OFF, 0);
+	gpio_direction_output(GPIO_DISPLAY_RST_L, 0);
+	gpio_direction_output(GPIO_DISPLAY_STBY, 0);
+	gpio_direction_input(GPIO_DISPLAY_RDY);
+	gpio_direction_input(GPIO_DISPLAY_ERR);
+
+	return 0;
+err:
+	for (--i; i >= 0; --i)
+		gpio_free(metronome_gpios[i]);
+
+	return ret;
+}
+
+static int n516_share_video_mem(struct fb_info *info)
+{
+	int ret;
+
+	dev_dbg(&n516_device->dev, "ENTER %s\n", __func__);
+	dev_dbg(&n516_device->dev, "%s, info->var.xres = %u, info->var.yres = %u\n", __func__, info->var.xres, info->var.yres);
+	/* rough check if this is our desired fb and not something else */
+	if ((info->var.xres != n516_fb_pdata.modes[0].xres)
+		|| (info->var.yres != n516_fb_pdata.modes[0].yres))
+		return 0;
+
+	/* we've now been notified that we have our new fb */
+	n516_board_info.metromem = info->screen_base;
+	n516_board_info.host_fbinfo = info;
+
+	n516_enable_hostfb(false);
+	/* try to refcount host drv since we are the consumer after this */
+	if (!try_module_get(info->fbops->owner))
+		return -ENODEV;
+
+	/* this _add binds metronomefb to n516. metronomefb refcounts n516 */
+	ret = platform_device_add(n516_device);
+
+	if (ret) {
+		platform_device_put(n516_device);
+		return ret;
+	}
+
+	/* request our platform independent driver */
+	request_module("metronomefb");
+
+	return 0;
+}
+
+static int n516_unshare_video_mem(struct fb_info *info)
+{
+	dev_dbg(&n516_device->dev, "ENTER %s\n", __func__);
+
+	if (info != n516_board_info.host_fbinfo)
+		return 0;
+
+	module_put(n516_board_info.host_fbinfo->fbops->owner);
+	return 0;
+}
+
+static int n516_fb_notifier_callback(struct notifier_block *self,
+				 unsigned long event, void *data)
+{
+	struct fb_event *evdata = data;
+	struct fb_info *info = evdata->info;
+
+	dev_dbg(&n516_device->dev, "ENTER %s\n", __func__);
+
+	if (event == FB_EVENT_FB_REGISTERED)
+		return n516_share_video_mem(info);
+	else if (event == FB_EVENT_FB_UNREGISTERED)
+		return n516_unshare_video_mem(info);
+
+	return 0;
+}
+
+static struct notifier_block n516_fb_notif = {
+	.notifier_call = n516_fb_notifier_callback,
+};
+
+/* this gets called as part of our init. these steps must be done now so
+ * that we can use set_pxa_fb_info */
+static void __init n516_presetup_fb(void)
+{
+	int padding_size;
+	int totalsize;
+
+	/* the frame buffer is divided as follows:
+	command | CRC | padding
+	16kb waveform data | CRC | padding
+	image data | CRC
+	*/
+
+	n516_board_info.fw = 800;
+	n516_board_info.fh = 624;
+
+	/* waveform must be 16k + 2 for checksum */
+	n516_board_info.wfm_size = roundup(16*1024 + 2, n516_board_info.fw);
+
+	padding_size = PAGE_SIZE + (4 * n516_board_info.fw);
+
+	/* total is 1 cmd , 1 wfm, padding and image */
+	totalsize = n516_board_info.fw + n516_board_info.wfm_size;
+	totalsize += padding_size + (n516_board_info.fw*n516_board_info.fh);
+
+	/* save this off because we're manipulating fw after this and
+	 * we'll need it when we're ready to setup the framebuffer */
+
+	/* the reason we do this adjustment is because we want to acquire
+	 * more framebuffer memory without imposing custom awareness on the
+	 * underlying driver */
+	n516_fb_pdata.modes[0].yres = DIV_ROUND_UP(totalsize, n516_board_info.fw);
+
+	jz4740_framebuffer_device.dev.platform_data = &n516_fb_pdata;
+	platform_device_register(&jz4740_framebuffer_device);
+}
+
+/* this gets called by metronomefb as part of its init, in our case, we
+ * have already completed initial framebuffer init in presetup_fb so we
+ * can just setup the fb access pointers */
+static int n516_setup_fb(struct metronomefb_par *par)
+{
+	/* metromem was set up by the notifier in share_video_mem so now
+	 * we can use its value to calculate the other entries */
+	par->metromem_cmd = (struct metromem_cmd *) n516_board_info.metromem;
+	par->metromem_wfm = n516_board_info.metromem + n516_board_info.fw;
+	par->metromem_img = par->metromem_wfm + n516_board_info.wfm_size;
+	par->metromem_img_csum = (u16 *) (par->metromem_img + (n516_board_info.fw * n516_board_info.fh));
+	par->metromem_dma = n516_board_info.host_fbinfo->fix.smem_start;
+
+	return 0;
+}
+
+static int n516_get_panel_type(void)
+{
+	return 5;
+}
+
+static irqreturn_t n516_handle_irq(int irq, void *dev_id)
+{
+	struct metronomefb_par *par = dev_id;
+
+	dev_dbg(&par->pdev->dev, "Metronome IRQ! RDY=%d\n", 	gpio_get_value(GPIO_DISPLAY_RDY));
+	wake_up_all(&par->waitq);
+
+	return IRQ_HANDLED;
+}
+
+static void n516_power_ctl(struct metronomefb_par *par, int cmd)
+{
+	switch (cmd) {
+	case METRONOME_POWER_OFF:
+		gpio_set_value(GPIO_DISPLAY_OFF, 1);
+		n516_enable_hostfb(false);
+		break;
+	case METRONOME_POWER_ON:
+		gpio_set_value(GPIO_DISPLAY_OFF, 0);
+		n516_enable_hostfb(true);
+		break;
+	}
+}
+
+static int n516_get_rdy(struct metronomefb_par *par)
+{
+	return gpio_get_value(GPIO_DISPLAY_RDY);
+}
+
+static int n516_get_err(struct metronomefb_par *par)
+{
+	return gpio_get_value(GPIO_DISPLAY_ERR);
+}
+
+static int n516_setup_irq(struct fb_info *info)
+{
+	int ret;
+
+	dev_dbg(&n516_device->dev, "ENTER %s\n", __func__);
+
+	ret = request_irq(gpio_to_irq(GPIO_DISPLAY_RDY), n516_handle_irq,
+				IRQF_TRIGGER_RISING,
+				"n516", info->par);
+	if (ret)
+		dev_err(&n516_device->dev, "request_irq failed: %d\n", ret);
+
+	return ret;
+}
+
+static void n516_set_rst(struct metronomefb_par *par, int state)
+{
+	dev_dbg(&n516_device->dev, "ENTER %s, RDY=%d\n", __func__, gpio_get_value(GPIO_DISPLAY_RDY));
+	if (state)
+		gpio_set_value(GPIO_DISPLAY_RST_L, 1);
+	else
+		gpio_set_value(GPIO_DISPLAY_RST_L, 0);
+}
+
+static void n516_set_stdby(struct metronomefb_par *par, int state)
+{
+	dev_dbg(&n516_device->dev, "ENTER %s, RDY=%d\n", __func__, gpio_get_value(GPIO_DISPLAY_RDY));
+	if (state)
+		gpio_set_value(GPIO_DISPLAY_STBY, 1);
+	else
+		gpio_set_value(GPIO_DISPLAY_STBY, 0);
+}
+
+static int n516_wait_event(struct metronomefb_par *par)
+{
+	unsigned long timeout = jiffies + HZ / 20;
+
+	dev_dbg(&n516_device->dev, "ENTER1 %s, RDY=%d\n",
+			__func__, gpio_get_value(GPIO_DISPLAY_RDY));
+	while (n516_get_rdy(par) && time_before(jiffies, timeout))
+		schedule();
+
+	dev_dbg(&n516_device->dev, "ENTER2 %s, RDY=%d\n",
+			__func__, gpio_get_value(GPIO_DISPLAY_RDY));
+	return wait_event_timeout(par->waitq,
+			n516_get_rdy(par), HZ * 2) ? 0 : -EIO;
+}
+
+static int n516_wait_event_intr(struct metronomefb_par *par)
+{
+	unsigned long timeout = jiffies + HZ/20;
+
+	dev_dbg(&n516_device->dev, "ENTER1 %s, RDY=%d\n",
+			__func__, gpio_get_value(GPIO_DISPLAY_RDY));
+	while (n516_get_rdy(par) && time_before(jiffies, timeout))
+		schedule();
+
+	dev_dbg(&n516_device->dev, "ENTER2 %s, RDY=%d\n",
+			__func__, gpio_get_value(GPIO_DISPLAY_RDY));
+	return wait_event_interruptible_timeout(par->waitq,
+					n516_get_rdy(par), HZ * 2) ? 0 : -EIO;
+}
+
+static void n516_cleanup(struct metronomefb_par *par)
+{
+	int i;
+
+	free_irq(gpio_to_irq(GPIO_DISPLAY_RDY), par);
+	for (i = 0; i < ARRAY_SIZE(metronome_gpios); ++i)
+		gpio_free(metronome_gpios[i]);
+}
+
+static struct metronome_board n516_board __initdata = {
+	.owner			= THIS_MODULE,
+	.power_ctl		= n516_power_ctl,
+	.setup_irq		= n516_setup_irq,
+	.setup_io		= n516_init_metronome_gpios,
+	.setup_fb		= n516_setup_fb,
+	.set_rst		= n516_set_rst,
+	.get_err		= n516_get_err,
+	.get_rdy		= n516_get_rdy,
+	.set_stdby		= n516_set_stdby,
+	.met_wait_event		= n516_wait_event,
+	.met_wait_event_intr	= n516_wait_event_intr,
+	.get_panel_type		= n516_get_panel_type,
+	.cleanup		= n516_cleanup,
+};
+
+static int __init n516_init(void)
+{
+	int ret;
+
+	/* Keep the metronome off, until its driver is loaded */
+	ret = gpio_request(GPIO_DISPLAY_OFF, "Display off");
+	if (ret)
+		return ret;
+
+	gpio_direction_output(GPIO_DISPLAY_OFF, 1);
+
+	/* before anything else, we request notification for any fb
+	 * creation events */
+	fb_register_client(&n516_fb_notif);
+
+	n516_device = platform_device_alloc("metronomefb", -1);
+	if (!n516_device)
+		return -ENOMEM;
+
+	/* the n516_board that will be seen by metronomefb is a copy */
+	platform_device_add_data(n516_device, &n516_board,
+					sizeof(n516_board));
+
+	n516_presetup_fb();
+
+	return 0;
+}
+module_init(n516_init);
+
+MODULE_DESCRIPTION("board driver for n516 display");
+MODULE_AUTHOR("Yauhen Kharuzhy");
+MODULE_LICENSE("GPL");