OMAP: DSS2: SDI driver

SDI (Serial Display Interface) implements TI Flatlink 3G display
interface.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@nokia.com>

diff --git a/drivers/video/omap2/dss/sdi.c b/drivers/video/omap2/dss/sdi.c
new file mode 100644 (file)
index 0000000..c24f307
--- /dev/null
+++ b/drivers/video/omap2/dss/sdi.c
@@ -0,0 +1,277 @@
+/*
+ * linux/drivers/video/omap2/dss/sdi.c
+ *
+ * Copyright (C) 2009 Nokia Corporation
+ * Author: Tomi Valkeinen <tomi.valkeinen@nokia.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#define DSS_SUBSYS_NAME "SDI"
+
+#include <linux/kernel.h>
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+
+#include <plat/display.h>
+#include "dss.h"
+
+static struct {
+       bool skip_init;
+       bool update_enabled;
+} sdi;
+
+static void sdi_basic_init(void)
+{
+       dispc_set_parallel_interface_mode(OMAP_DSS_PARALLELMODE_BYPASS);
+
+       dispc_set_lcd_display_type(OMAP_DSS_LCD_DISPLAY_TFT);
+       dispc_set_tft_data_lines(24);
+       dispc_lcd_enable_signal_polarity(1);
+}
+
+static int sdi_display_enable(struct omap_dss_device *dssdev)
+{
+       struct omap_video_timings *t = &dssdev->panel.timings;
+       struct dss_clock_info dss_cinfo;
+       struct dispc_clock_info dispc_cinfo;
+       u16 lck_div, pck_div;
+       unsigned long fck;
+       unsigned long pck;
+       int r;
+
+       r = omap_dss_start_device(dssdev);
+       if (r) {
+               DSSERR("failed to start device\n");
+               goto err0;
+       }
+
+       if (dssdev->state != OMAP_DSS_DISPLAY_DISABLED) {
+               DSSERR("dssdev already enabled\n");
+               r = -EINVAL;
+               goto err1;
+       }
+
+       /* In case of skip_init sdi_init has already enabled the clocks */
+       if (!sdi.skip_init)
+               dss_clk_enable(DSS_CLK_ICK | DSS_CLK_FCK1);
+
+       sdi_basic_init();
+
+       /* 15.5.9.1.2 */
+       dssdev->panel.config |= OMAP_DSS_LCD_RF | OMAP_DSS_LCD_ONOFF;
+
+       dispc_set_pol_freq(dssdev->panel.config, dssdev->panel.acbi,
+                       dssdev->panel.acb);
+
+       if (!sdi.skip_init) {
+               r = dss_calc_clock_div(1, t->pixel_clock * 1000,
+                               &dss_cinfo, &dispc_cinfo);
+       } else {
+               r = dss_get_clock_div(&dss_cinfo);
+               r = dispc_get_clock_div(&dispc_cinfo);
+       }
+
+       if (r)
+               goto err2;
+
+       fck = dss_cinfo.fck;
+       lck_div = dispc_cinfo.lck_div;
+       pck_div = dispc_cinfo.pck_div;
+
+       pck = fck / lck_div / pck_div / 1000;
+
+       if (pck != t->pixel_clock) {
+               DSSWARN("Could not find exact pixel clock. Requested %d kHz, "
+                               "got %lu kHz\n",
+                               t->pixel_clock, pck);
+
+               t->pixel_clock = pck;
+       }
+
+
+       dispc_set_lcd_timings(t);
+
+       r = dss_set_clock_div(&dss_cinfo);
+       if (r)
+               goto err2;
+
+       r = dispc_set_clock_div(&dispc_cinfo);
+       if (r)
+               goto err2;
+
+       if (!sdi.skip_init) {
+               dss_sdi_init(dssdev->phy.sdi.datapairs);
+               r = dss_sdi_enable();
+               if (r)
+                       goto err1;
+               mdelay(2);
+       }
+
+       dispc_enable_lcd_out(1);
+
+       if (dssdev->driver->enable) {
+               r = dssdev->driver->enable(dssdev);
+               if (r)
+                       goto err3;
+       }
+
+       dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
+
+       sdi.skip_init = 0;
+
+       return 0;
+err3:
+       dispc_enable_lcd_out(0);
+err2:
+       dss_clk_disable(DSS_CLK_ICK | DSS_CLK_FCK1);
+err1:
+       omap_dss_stop_device(dssdev);
+err0:
+       return r;
+}
+
+static int sdi_display_resume(struct omap_dss_device *dssdev);
+
+static void sdi_display_disable(struct omap_dss_device *dssdev)
+{
+       if (dssdev->state == OMAP_DSS_DISPLAY_DISABLED)
+               return;
+
+       if (dssdev->state == OMAP_DSS_DISPLAY_SUSPENDED)
+               if (sdi_display_resume(dssdev))
+                       return;
+
+       if (dssdev->driver->disable)
+               dssdev->driver->disable(dssdev);
+
+       dispc_enable_lcd_out(0);
+
+       dss_sdi_disable();
+
+       dss_clk_disable(DSS_CLK_ICK | DSS_CLK_FCK1);
+
+       dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
+
+       omap_dss_stop_device(dssdev);
+}
+
+static int sdi_display_suspend(struct omap_dss_device *dssdev)
+{
+       if (dssdev->state != OMAP_DSS_DISPLAY_ACTIVE)
+               return -EINVAL;
+
+       if (dssdev->driver->suspend)
+               dssdev->driver->suspend(dssdev);
+
+       dispc_enable_lcd_out(0);
+
+       dss_sdi_disable();
+
+       dss_clk_disable(DSS_CLK_ICK | DSS_CLK_FCK1);
+
+       dssdev->state = OMAP_DSS_DISPLAY_SUSPENDED;
+
+       return 0;
+}
+
+static int sdi_display_resume(struct omap_dss_device *dssdev)
+{
+       int r;
+
+       if (dssdev->state != OMAP_DSS_DISPLAY_SUSPENDED)
+               return -EINVAL;
+
+       dss_clk_enable(DSS_CLK_ICK | DSS_CLK_FCK1);
+
+       r = dss_sdi_enable();
+       if (r)
+               goto err;
+       mdelay(2);
+
+       dispc_enable_lcd_out(1);
+
+       if (dssdev->driver->resume)
+               dssdev->driver->resume(dssdev);
+
+       dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
+
+       return 0;
+err:
+       dss_clk_disable(DSS_CLK_ICK | DSS_CLK_FCK1);
+       return r;
+}
+
+static int sdi_display_set_update_mode(struct omap_dss_device *dssdev,
+               enum omap_dss_update_mode mode)
+{
+       if (mode == OMAP_DSS_UPDATE_MANUAL)
+               return -EINVAL;
+
+       if (mode == OMAP_DSS_UPDATE_DISABLED) {
+               dispc_enable_lcd_out(0);
+               sdi.update_enabled = 0;
+       } else {
+               dispc_enable_lcd_out(1);
+               sdi.update_enabled = 1;
+       }
+
+       return 0;
+}
+
+static enum omap_dss_update_mode sdi_display_get_update_mode(
+               struct omap_dss_device *dssdev)
+{
+       return sdi.update_enabled ? OMAP_DSS_UPDATE_AUTO :
+               OMAP_DSS_UPDATE_DISABLED;
+}
+
+static void sdi_get_timings(struct omap_dss_device *dssdev,
+                       struct omap_video_timings *timings)
+{
+       *timings = dssdev->panel.timings;
+}
+
+int sdi_init_display(struct omap_dss_device *dssdev)
+{
+       DSSDBG("SDI init\n");
+
+       dssdev->enable = sdi_display_enable;
+       dssdev->disable = sdi_display_disable;
+       dssdev->suspend = sdi_display_suspend;
+       dssdev->resume = sdi_display_resume;
+       dssdev->set_update_mode = sdi_display_set_update_mode;
+       dssdev->get_update_mode = sdi_display_get_update_mode;
+       dssdev->get_timings = sdi_get_timings;
+
+       return 0;
+}
+
+int sdi_init(bool skip_init)
+{
+       /* we store this for first display enable, then clear it */
+       sdi.skip_init = skip_init;
+
+       /*
+        * Enable clocks already here, otherwise there would be a toggle
+        * of them until sdi_display_enable is called.
+        */
+       if (skip_init)
+               dss_clk_enable(DSS_CLK_ICK | DSS_CLK_FCK1);
+       return 0;
+}
+
+void sdi_exit(void)
+{
+}