Staging: add MSM framebuffer driver

Qualcomm development of the MSM SOC framebuffer driver has
diverged significantly from the driver used by Android. This
is a snapshot of our current driver, in all it's agony. We are
putting this in staging to help with the process of converging
the two drivers.

At this point, the driver has been tested only in dumb
framebuffer mode.

Signed-off-by: Stepan Moskovchenko <stepanm@codeaurora.org>
Signed-off-by: David Brown <davidb@codeaurora.org>
Signed-off-by: Abhijeet Dharmapurikar <adharmap@codeaurora.org>
[dwalker@codeaurora.org: added a small compile fix and TODO.]
Signed-off-by: Daniel Walker <dwalker@codeaurora.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 239 insertions, 0 deletions

diff --git a/drivers/staging/msm/lcdc.c b/drivers/staging/msm/lcdc.c
new file mode 100644
index 000000000000..735280ab72cb
--- /dev/null
+++ b/drivers/staging/msm/lcdc.c
@@ -0,0 +1,239 @@
+/* Copyright (c) 2008-2009, Code Aurora Forum. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program 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 this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/time.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/spinlock.h>
+#include <linux/delay.h>
+#include <mach/hardware.h>
+#include <linux/io.h>
+
+#include <asm/system.h>
+#include <asm/mach-types.h>
+#include <linux/semaphore.h>
+#include <linux/uaccess.h>
+#include <linux/clk.h>
+#include <linux/platform_device.h>
+#include <linux/pm_qos_params.h>
+
+#include "msm_fb.h"
+
+static int lcdc_probe(struct platform_device *pdev);
+static int lcdc_remove(struct platform_device *pdev);
+
+static int lcdc_off(struct platform_device *pdev);
+static int lcdc_on(struct platform_device *pdev);
+
+static struct platform_device *pdev_list[MSM_FB_MAX_DEV_LIST];
+static int pdev_list_cnt;
+
+static struct clk *mdp_lcdc_pclk_clk;
+static struct clk *mdp_lcdc_pad_pclk_clk;
+
+int mdp_lcdc_pclk_clk_rate;
+int mdp_lcdc_pad_pclk_clk_rate;
+
+static struct platform_driver lcdc_driver = {
+	.probe = lcdc_probe,
+	.remove = lcdc_remove,
+	.suspend = NULL,
+	.resume = NULL,
+	.shutdown = NULL,
+	.driver = {
+		   .name = "lcdc",
+		   },
+};
+
+static struct lcdc_platform_data *lcdc_pdata;
+
+static int lcdc_off(struct platform_device *pdev)
+{
+	int ret = 0;
+
+	ret = panel_next_off(pdev);
+
+	clk_disable(mdp_lcdc_pclk_clk);
+	clk_disable(mdp_lcdc_pad_pclk_clk);
+
+	if (lcdc_pdata && lcdc_pdata->lcdc_power_save)
+		lcdc_pdata->lcdc_power_save(0);
+
+	if (lcdc_pdata && lcdc_pdata->lcdc_gpio_config)
+		ret = lcdc_pdata->lcdc_gpio_config(0);
+
+//	pm_qos_update_requirement(PM_QOS_SYSTEM_BUS_FREQ , "lcdc",
+//					PM_QOS_DEFAULT_VALUE);
+
+	return ret;
+}
+
+static int lcdc_on(struct platform_device *pdev)
+{
+	int ret = 0;
+	struct msm_fb_data_type *mfd;
+	unsigned long panel_pixclock_freq , pm_qos_freq;
+
+	mfd = platform_get_drvdata(pdev);
+	panel_pixclock_freq = mfd->fbi->var.pixclock;
+
+	if (panel_pixclock_freq > 58000000)
+		/* pm_qos_freq should be in Khz */
+		pm_qos_freq = panel_pixclock_freq / 1000 ;
+	else
+		pm_qos_freq = 58000;
+
+//	pm_qos_update_requirement(PM_QOS_SYSTEM_BUS_FREQ , "lcdc",
+//						pm_qos_freq);
+	mfd = platform_get_drvdata(pdev);
+
+	clk_enable(mdp_lcdc_pclk_clk);
+	clk_enable(mdp_lcdc_pad_pclk_clk);
+
+	if (lcdc_pdata && lcdc_pdata->lcdc_power_save)
+		lcdc_pdata->lcdc_power_save(1);
+	if (lcdc_pdata && lcdc_pdata->lcdc_gpio_config)
+		ret = lcdc_pdata->lcdc_gpio_config(1);
+
+	clk_set_rate(mdp_lcdc_pclk_clk, mfd->fbi->var.pixclock);
+	clk_set_rate(mdp_lcdc_pad_pclk_clk, mfd->fbi->var.pixclock);
+	mdp_lcdc_pclk_clk_rate = clk_get_rate(mdp_lcdc_pclk_clk);
+	mdp_lcdc_pad_pclk_clk_rate = clk_get_rate(mdp_lcdc_pad_pclk_clk);
+
+	ret = panel_next_on(pdev);
+	return ret;
+}
+
+static int lcdc_probe(struct platform_device *pdev)
+{
+	struct msm_fb_data_type *mfd;
+	struct fb_info *fbi;
+	struct platform_device *mdp_dev = NULL;
+	struct msm_fb_panel_data *pdata = NULL;
+	int rc;
+
+	if (pdev->id == 0) {
+		lcdc_pdata = pdev->dev.platform_data;
+		return 0;
+	}
+
+	mfd = platform_get_drvdata(pdev);
+
+	if (!mfd)
+		return -ENODEV;
+
+	if (mfd->key != MFD_KEY)
+		return -EINVAL;
+
+	if (pdev_list_cnt >= MSM_FB_MAX_DEV_LIST)
+		return -ENOMEM;
+
+	mdp_dev = platform_device_alloc("mdp", pdev->id);
+	if (!mdp_dev)
+		return -ENOMEM;
+
+	/*
+	 * link to the latest pdev
+	 */
+	mfd->pdev = mdp_dev;
+	mfd->dest = DISPLAY_LCDC;
+
+	/*
+	 * alloc panel device data
+	 */
+	if (platform_device_add_data
+	    (mdp_dev, pdev->dev.platform_data,
+	     sizeof(struct msm_fb_panel_data))) {
+		printk(KERN_ERR "lcdc_probe: platform_device_add_data failed!\n");
+		platform_device_put(mdp_dev);
+		return -ENOMEM;
+	}
+	/*
+	 * data chain
+	 */
+	pdata = (struct msm_fb_panel_data *)mdp_dev->dev.platform_data;
+	pdata->on = lcdc_on;
+	pdata->off = lcdc_off;
+	pdata->next = pdev;
+
+	/*
+	 * get/set panel specific fb info
+	 */
+	mfd->panel_info = pdata->panel_info;
+	mfd->fb_imgType = MDP_RGB_565;
+
+	fbi = mfd->fbi;
+	fbi->var.pixclock = mfd->panel_info.clk_rate;
+	fbi->var.left_margin = mfd->panel_info.lcdc.h_back_porch;
+	fbi->var.right_margin = mfd->panel_info.lcdc.h_front_porch;
+	fbi->var.upper_margin = mfd->panel_info.lcdc.v_back_porch;
+	fbi->var.lower_margin = mfd->panel_info.lcdc.v_front_porch;
+	fbi->var.hsync_len = mfd->panel_info.lcdc.h_pulse_width;
+	fbi->var.vsync_len = mfd->panel_info.lcdc.v_pulse_width;
+
+	/*
+	 * set driver data
+	 */
+	platform_set_drvdata(mdp_dev, mfd);
+
+	/*
+	 * register in mdp driver
+	 */
+	rc = platform_device_add(mdp_dev);
+	if (rc)
+		goto lcdc_probe_err;
+
+	pdev_list[pdev_list_cnt++] = pdev;
+		return 0;
+
+lcdc_probe_err:
+	platform_device_put(mdp_dev);
+	return rc;
+}
+
+static int lcdc_remove(struct platform_device *pdev)
+{
+//	pm_qos_remove_requirement(PM_QOS_SYSTEM_BUS_FREQ , "lcdc");
+	return 0;
+}
+
+static int lcdc_register_driver(void)
+{
+	return platform_driver_register(&lcdc_driver);
+}
+
+static int __init lcdc_driver_init(void)
+{
+	mdp_lcdc_pclk_clk = clk_get(NULL, "mdp_lcdc_pclk_clk");
+	if (IS_ERR(mdp_lcdc_pclk_clk)) {
+		printk(KERN_ERR "error: can't get mdp_lcdc_pclk_clk!\n");
+		return IS_ERR(mdp_lcdc_pclk_clk);
+	}
+	mdp_lcdc_pad_pclk_clk = clk_get(NULL, "mdp_lcdc_pad_pclk_clk");
+	if (IS_ERR(mdp_lcdc_pad_pclk_clk)) {
+		printk(KERN_ERR "error: can't get mdp_lcdc_pad_pclk_clk!\n");
+		return IS_ERR(mdp_lcdc_pad_pclk_clk);
+	}
+//	pm_qos_add_requirement(PM_QOS_SYSTEM_BUS_FREQ , "lcdc",
+//				PM_QOS_DEFAULT_VALUE);
+	return lcdc_register_driver();
+}
+
+module_init(lcdc_driver_init);