1 files changed, 744 insertions, 0 deletions
diff --git a/drivers/video/omap2/dss/dpi.c b/drivers/video/omap2/dss/dpi.c
new file mode 100644
index 00000000..757b57f7
--- /dev/null
+++ b/drivers/video/omap2/dss/dpi.c
@@ -0,0 +1,744 @@
+/*
+ * linux/drivers/video/omap2/dss/dpi.c
+ *
+ * Copyright (C) 2009 Nokia Corporation
+ * Author: Tomi Valkeinen <tomi.valkeinen@nokia.com>
+ *
+ * Some code and ideas taken from drivers/video/omap/ driver
+ * by Imre Deak.
+ *
+ * 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 "DPI"
+
+#include <linux/kernel.h>
+#include <linux/delay.h>
+#include <linux/export.h>
+#include <linux/err.h>
+#include <linux/errno.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/consumer.h>
+#include <linux/string.h>
+
+#include <video/omapdss.h>
+
+#include "dss.h"
+#include "dss_features.h"
+
+static struct {
+	struct regulator *vdds_dsi_reg;
+	struct platform_device *dsidev;
+
+	struct mutex lock;
+
+	struct omap_video_timings timings;
+	struct dss_lcd_mgr_config mgr_config;
+	int data_lines;
+
+	struct omap_dss_output output;
+} dpi;
+
+static struct platform_device *dpi_get_dsidev(enum omap_channel channel)
+{
+	/*
+	 * XXX we can't currently use DSI PLL for DPI with OMAP3, as the DSI PLL
+	 * would also be used for DISPC fclk. Meaning, when the DPI output is
+	 * disabled, DISPC clock will be disabled, and TV out will stop.
+	 */
+	switch (omapdss_get_version()) {
+	case OMAPDSS_VER_OMAP24xx:
+	case OMAPDSS_VER_OMAP34xx_ES1:
+	case OMAPDSS_VER_OMAP34xx_ES3:
+	case OMAPDSS_VER_OMAP3630:
+	case OMAPDSS_VER_AM35xx:
+		return NULL;
+
+	case OMAPDSS_VER_OMAP4430_ES1:
+	case OMAPDSS_VER_OMAP4430_ES2:
+	case OMAPDSS_VER_OMAP4:
+		switch (channel) {
+		case OMAP_DSS_CHANNEL_LCD:
+			return dsi_get_dsidev_from_id(0);
+		case OMAP_DSS_CHANNEL_LCD2:
+			return dsi_get_dsidev_from_id(1);
+		default:
+			return NULL;
+		}
+
+	case OMAPDSS_VER_OMAP5:
+		switch (channel) {
+		case OMAP_DSS_CHANNEL_LCD:
+			return dsi_get_dsidev_from_id(0);
+		case OMAP_DSS_CHANNEL_LCD3:
+			return dsi_get_dsidev_from_id(1);
+		default:
+			return NULL;
+		}
+
+	default:
+		return NULL;
+	}
+}
+
+static enum omap_dss_clk_source dpi_get_alt_clk_src(enum omap_channel channel)
+{
+	switch (channel) {
+	case OMAP_DSS_CHANNEL_LCD:
+		return OMAP_DSS_CLK_SRC_DSI_PLL_HSDIV_DISPC;
+	case OMAP_DSS_CHANNEL_LCD2:
+		return OMAP_DSS_CLK_SRC_DSI2_PLL_HSDIV_DISPC;
+	default:
+		/* this shouldn't happen */
+		WARN_ON(1);
+		return OMAP_DSS_CLK_SRC_FCK;
+	}
+}
+
+struct dpi_clk_calc_ctx {
+	struct platform_device *dsidev;
+
+	/* inputs */
+
+	unsigned long pck_min, pck_max;
+
+	/* outputs */
+
+	struct dsi_clock_info dsi_cinfo;
+	struct dss_clock_info dss_cinfo;
+	struct dispc_clock_info dispc_cinfo;
+};
+
+static bool dpi_calc_dispc_cb(int lckd, int pckd, unsigned long lck,
+		unsigned long pck, void *data)
+{
+	struct dpi_clk_calc_ctx *ctx = data;
+
+	/*
+	 * Odd dividers give us uneven duty cycle, causing problem when level
+	 * shifted. So skip all odd dividers when the pixel clock is on the
+	 * higher side.
+	 */
+	if (ctx->pck_min >= 1000000) {
+		if (lckd > 1 && lckd % 2 != 0)
+			return false;
+
+		if (pckd > 1 && pckd % 2 != 0)
+			return false;
+	}
+
+	ctx->dispc_cinfo.lck_div = lckd;
+	ctx->dispc_cinfo.pck_div = pckd;
+	ctx->dispc_cinfo.lck = lck;
+	ctx->dispc_cinfo.pck = pck;
+
+	return true;
+}
+
+
+static bool dpi_calc_hsdiv_cb(int regm_dispc, unsigned long dispc,
+		void *data)
+{
+	struct dpi_clk_calc_ctx *ctx = data;
+
+	/*
+	 * Odd dividers give us uneven duty cycle, causing problem when level
+	 * shifted. So skip all odd dividers when the pixel clock is on the
+	 * higher side.
+	 */
+	if (regm_dispc > 1 && regm_dispc % 2 != 0 && ctx->pck_min >= 1000000)
+		return false;
+
+	ctx->dsi_cinfo.regm_dispc = regm_dispc;
+	ctx->dsi_cinfo.dsi_pll_hsdiv_dispc_clk = dispc;
+
+	return dispc_div_calc(dispc, ctx->pck_min, ctx->pck_max,
+			dpi_calc_dispc_cb, ctx);
+}
+
+
+static bool dpi_calc_pll_cb(int regn, int regm, unsigned long fint,
+		unsigned long pll,
+		void *data)
+{
+	struct dpi_clk_calc_ctx *ctx = data;
+
+	ctx->dsi_cinfo.regn = regn;
+	ctx->dsi_cinfo.regm = regm;
+	ctx->dsi_cinfo.fint = fint;
+	ctx->dsi_cinfo.clkin4ddr = pll;
+
+	return dsi_hsdiv_calc(ctx->dsidev, pll, ctx->pck_min,
+			dpi_calc_hsdiv_cb, ctx);
+}
+
+static bool dpi_calc_dss_cb(int fckd, unsigned long fck, void *data)
+{
+	struct dpi_clk_calc_ctx *ctx = data;
+
+	ctx->dss_cinfo.fck = fck;
+	ctx->dss_cinfo.fck_div = fckd;
+
+	return dispc_div_calc(fck, ctx->pck_min, ctx->pck_max,
+			dpi_calc_dispc_cb, ctx);
+}
+
+static bool dpi_dsi_clk_calc(unsigned long pck, struct dpi_clk_calc_ctx *ctx)
+{
+	unsigned long clkin;
+	unsigned long pll_min, pll_max;
+
+	clkin = dsi_get_pll_clkin(dpi.dsidev);
+
+	memset(ctx, 0, sizeof(*ctx));
+	ctx->dsidev = dpi.dsidev;
+	ctx->pck_min = pck - 1000;
+	ctx->pck_max = pck + 1000;
+	ctx->dsi_cinfo.clkin = clkin;
+
+	pll_min = 0;
+	pll_max = 0;
+
+	return dsi_pll_calc(dpi.dsidev, clkin,
+			pll_min, pll_max,
+			dpi_calc_pll_cb, ctx);
+}
+
+static bool dpi_dss_clk_calc(unsigned long pck, struct dpi_clk_calc_ctx *ctx)
+{
+	int i;
+
+	/*
+	 * DSS fck gives us very few possibilities, so finding a good pixel
+	 * clock may not be possible. We try multiple times to find the clock,
+	 * each time widening the pixel clock range we look for, up to
+	 * +/- ~15MHz.
+	 */
+
+	for (i = 0; i < 25; ++i) {
+		bool ok;
+
+		memset(ctx, 0, sizeof(*ctx));
+		if (pck > 1000 * i * i * i)
+			ctx->pck_min = max(pck - 1000 * i * i * i, 0lu);
+		else
+			ctx->pck_min = 0;
+		ctx->pck_max = pck + 1000 * i * i * i;
+
+		ok = dss_div_calc(ctx->pck_min, dpi_calc_dss_cb, ctx);
+		if (ok)
+			return ok;
+	}
+
+	return false;
+}
+
+
+
+static int dpi_set_dsi_clk(enum omap_channel channel,
+		unsigned long pck_req, unsigned long *fck, int *lck_div,
+		int *pck_div)
+{
+	struct dpi_clk_calc_ctx ctx;
+	int r;
+	bool ok;
+
+	ok = dpi_dsi_clk_calc(pck_req, &ctx);
+	if (!ok)
+		return -EINVAL;
+
+	r = dsi_pll_set_clock_div(dpi.dsidev, &ctx.dsi_cinfo);
+	if (r)
+		return r;
+
+	dss_select_lcd_clk_source(channel,
+			dpi_get_alt_clk_src(channel));
+
+	dpi.mgr_config.clock_info = ctx.dispc_cinfo;
+
+	*fck = ctx.dsi_cinfo.dsi_pll_hsdiv_dispc_clk;
+	*lck_div = ctx.dispc_cinfo.lck_div;
+	*pck_div = ctx.dispc_cinfo.pck_div;
+
+	return 0;
+}
+
+static int dpi_set_dispc_clk(unsigned long pck_req, unsigned long *fck,
+		int *lck_div, int *pck_div)
+{
+	struct dpi_clk_calc_ctx ctx;
+	int r;
+	bool ok;
+
+	ok = dpi_dss_clk_calc(pck_req, &ctx);
+	if (!ok)
+		return -EINVAL;
+
+	r = dss_set_clock_div(&ctx.dss_cinfo);
+	if (r)
+		return r;
+
+	dpi.mgr_config.clock_info = ctx.dispc_cinfo;
+
+	*fck = ctx.dss_cinfo.fck;
+	*lck_div = ctx.dispc_cinfo.lck_div;
+	*pck_div = ctx.dispc_cinfo.pck_div;
+
+	return 0;
+}
+
+static int dpi_set_mode(struct omap_overlay_manager *mgr)
+{
+	struct omap_video_timings *t = &dpi.timings;
+	int lck_div = 0, pck_div = 0;
+	unsigned long fck = 0;
+	unsigned long pck;
+	int r = 0;
+
+	if (dpi.dsidev)
+		r = dpi_set_dsi_clk(mgr->id, t->pixel_clock * 1000, &fck,
+				&lck_div, &pck_div);
+	else
+		r = dpi_set_dispc_clk(t->pixel_clock * 1000, &fck,
+				&lck_div, &pck_div);
+	if (r)
+		return r;
+
+	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;
+	}
+
+	dss_mgr_set_timings(mgr, t);
+
+	return 0;
+}
+
+static void dpi_config_lcd_manager(struct omap_overlay_manager *mgr)
+{
+	dpi.mgr_config.io_pad_mode = DSS_IO_PAD_MODE_BYPASS;
+
+	dpi.mgr_config.stallmode = false;
+	dpi.mgr_config.fifohandcheck = false;
+
+	dpi.mgr_config.video_port_width = dpi.data_lines;
+
+	dpi.mgr_config.lcden_sig_polarity = 0;
+
+	dss_mgr_set_lcd_config(mgr, &dpi.mgr_config);
+}
+
+int omapdss_dpi_display_enable(struct omap_dss_device *dssdev)
+{
+	struct omap_dss_output *out = &dpi.output;
+	int r;
+
+	mutex_lock(&dpi.lock);
+
+	if (dss_has_feature(FEAT_DPI_USES_VDDS_DSI) && !dpi.vdds_dsi_reg) {
+		DSSERR("no VDSS_DSI regulator\n");
+		r = -ENODEV;
+		goto err_no_reg;
+	}
+
+	if (out == NULL || out->manager == NULL) {
+		DSSERR("failed to enable display: no output/manager\n");
+		r = -ENODEV;
+		goto err_no_out_mgr;
+	}
+
+	r = omap_dss_start_device(dssdev);
+	if (r) {
+		DSSERR("failed to start device\n");
+		goto err_start_dev;
+	}
+
+	if (dss_has_feature(FEAT_DPI_USES_VDDS_DSI)) {
+		r = regulator_enable(dpi.vdds_dsi_reg);
+		if (r)
+			goto err_reg_enable;
+	}
+
+	r = dispc_runtime_get();
+	if (r)
+		goto err_get_dispc;
+
+	r = dss_dpi_select_source(out->manager->id);
+	if (r)
+		goto err_src_sel;
+
+	if (dpi.dsidev) {
+		r = dsi_runtime_get(dpi.dsidev);
+		if (r)
+			goto err_get_dsi;
+
+		r = dsi_pll_init(dpi.dsidev, 0, 1);
+		if (r)
+			goto err_dsi_pll_init;
+	}
+
+	r = dpi_set_mode(out->manager);
+	if (r)
+		goto err_set_mode;
+
+	dpi_config_lcd_manager(out->manager);
+
+	mdelay(2);
+
+	r = dss_mgr_enable(out->manager);
+	if (r)
+		goto err_mgr_enable;
+
+	mutex_unlock(&dpi.lock);
+
+	return 0;
+
+err_mgr_enable:
+err_set_mode:
+	if (dpi.dsidev)
+		dsi_pll_uninit(dpi.dsidev, true);
+err_dsi_pll_init:
+	if (dpi.dsidev)
+		dsi_runtime_put(dpi.dsidev);
+err_get_dsi:
+err_src_sel:
+	dispc_runtime_put();
+err_get_dispc:
+	if (dss_has_feature(FEAT_DPI_USES_VDDS_DSI))
+		regulator_disable(dpi.vdds_dsi_reg);
+err_reg_enable:
+	omap_dss_stop_device(dssdev);
+err_start_dev:
+err_no_out_mgr:
+err_no_reg:
+	mutex_unlock(&dpi.lock);
+	return r;
+}
+EXPORT_SYMBOL(omapdss_dpi_display_enable);
+
+void omapdss_dpi_display_disable(struct omap_dss_device *dssdev)
+{
+	struct omap_overlay_manager *mgr = dpi.output.manager;
+
+	mutex_lock(&dpi.lock);
+
+	dss_mgr_disable(mgr);
+
+	if (dpi.dsidev) {
+		dss_select_lcd_clk_source(mgr->id, OMAP_DSS_CLK_SRC_FCK);
+		dsi_pll_uninit(dpi.dsidev, true);
+		dsi_runtime_put(dpi.dsidev);
+	}
+
+	dispc_runtime_put();
+
+	if (dss_has_feature(FEAT_DPI_USES_VDDS_DSI))
+		regulator_disable(dpi.vdds_dsi_reg);
+
+	omap_dss_stop_device(dssdev);
+
+	mutex_unlock(&dpi.lock);
+}
+EXPORT_SYMBOL(omapdss_dpi_display_disable);
+
+void omapdss_dpi_set_timings(struct omap_dss_device *dssdev,
+		struct omap_video_timings *timings)
+{
+	DSSDBG("dpi_set_timings\n");
+
+	mutex_lock(&dpi.lock);
+
+	dpi.timings = *timings;
+
+	mutex_unlock(&dpi.lock);
+}
+EXPORT_SYMBOL(omapdss_dpi_set_timings);
+
+int dpi_check_timings(struct omap_dss_device *dssdev,
+			struct omap_video_timings *timings)
+{
+	struct omap_overlay_manager *mgr = dpi.output.manager;
+	int lck_div, pck_div;
+	unsigned long fck;
+	unsigned long pck;
+	struct dpi_clk_calc_ctx ctx;
+	bool ok;
+
+	if (mgr && !dispc_mgr_timings_ok(mgr->id, timings))
+		return -EINVAL;
+
+	if (timings->pixel_clock == 0)
+		return -EINVAL;
+
+	if (dpi.dsidev) {
+		ok = dpi_dsi_clk_calc(timings->pixel_clock * 1000, &ctx);
+		if (!ok)
+			return -EINVAL;
+
+		fck = ctx.dsi_cinfo.dsi_pll_hsdiv_dispc_clk;
+	} else {
+		ok = dpi_dss_clk_calc(timings->pixel_clock * 1000, &ctx);
+		if (!ok)
+			return -EINVAL;
+
+		fck = ctx.dss_cinfo.fck;
+	}
+
+	lck_div = ctx.dispc_cinfo.lck_div;
+	pck_div = ctx.dispc_cinfo.pck_div;
+
+	pck = fck / lck_div / pck_div / 1000;
+
+	timings->pixel_clock = pck;
+
+	return 0;
+}
+EXPORT_SYMBOL(dpi_check_timings);
+
+void omapdss_dpi_set_data_lines(struct omap_dss_device *dssdev, int data_lines)
+{
+	mutex_lock(&dpi.lock);
+
+	dpi.data_lines = data_lines;
+
+	mutex_unlock(&dpi.lock);
+}
+EXPORT_SYMBOL(omapdss_dpi_set_data_lines);
+
+static int dpi_verify_dsi_pll(struct platform_device *dsidev)
+{
+	int r;
+
+	/* do initial setup with the PLL to see if it is operational */
+
+	r = dsi_runtime_get(dsidev);
+	if (r)
+		return r;
+
+	r = dsi_pll_init(dsidev, 0, 1);
+	if (r) {
+		dsi_runtime_put(dsidev);
+		return r;
+	}
+
+	dsi_pll_uninit(dsidev, true);
+	dsi_runtime_put(dsidev);
+
+	return 0;
+}
+
+/*
+ * Return a hardcoded channel for the DPI output. This should work for
+ * current use cases, but this can be later expanded to either resolve
+ * the channel in some more dynamic manner, or get the channel as a user
+ * parameter.
+ */
+static enum omap_channel dpi_get_channel(void)
+{
+	switch (omapdss_get_version()) {
+	case OMAPDSS_VER_OMAP24xx:
+	case OMAPDSS_VER_OMAP34xx_ES1:
+	case OMAPDSS_VER_OMAP34xx_ES3:
+	case OMAPDSS_VER_OMAP3630:
+	case OMAPDSS_VER_AM35xx:
+		return OMAP_DSS_CHANNEL_LCD;
+
+	case OMAPDSS_VER_OMAP4430_ES1:
+	case OMAPDSS_VER_OMAP4430_ES2:
+	case OMAPDSS_VER_OMAP4:
+		return OMAP_DSS_CHANNEL_LCD2;
+
+	case OMAPDSS_VER_OMAP5:
+		return OMAP_DSS_CHANNEL_LCD3;
+
+	default:
+		DSSWARN("unsupported DSS version\n");
+		return OMAP_DSS_CHANNEL_LCD;
+	}
+}
+
+static int dpi_init_display(struct omap_dss_device *dssdev)
+{
+	struct platform_device *dsidev;
+
+	DSSDBG("init_display\n");
+
+	if (dss_has_feature(FEAT_DPI_USES_VDDS_DSI) &&
+					dpi.vdds_dsi_reg == NULL) {
+		struct regulator *vdds_dsi;
+
+		vdds_dsi = dss_get_vdds_dsi();
+
+		if (IS_ERR(vdds_dsi)) {
+			DSSERR("can't get VDDS_DSI regulator\n");
+			return PTR_ERR(vdds_dsi);
+		}
+
+		dpi.vdds_dsi_reg = vdds_dsi;
+	}
+
+	dsidev = dpi_get_dsidev(dpi.output.dispc_channel);
+
+	if (dsidev && dpi_verify_dsi_pll(dsidev)) {
+		dsidev = NULL;
+		DSSWARN("DSI PLL not operational\n");
+	}
+
+	if (dsidev)
+		DSSDBG("using DSI PLL for DPI clock\n");
+
+	dpi.dsidev = dsidev;
+
+	return 0;
+}
+
+static struct omap_dss_device *dpi_find_dssdev(struct platform_device *pdev)
+{
+	struct omap_dss_board_info *pdata = pdev->dev.platform_data;
+	const char *def_disp_name = omapdss_get_default_display_name();
+	struct omap_dss_device *def_dssdev;
+	int i;
+
+	def_dssdev = NULL;
+
+	for (i = 0; i < pdata->num_devices; ++i) {
+		struct omap_dss_device *dssdev = pdata->devices[i];
+
+		if (dssdev->type != OMAP_DISPLAY_TYPE_DPI)
+			continue;
+
+		if (def_dssdev == NULL)
+			def_dssdev = dssdev;
+
+		if (def_disp_name != NULL &&
+				strcmp(dssdev->name, def_disp_name) == 0) {
+			def_dssdev = dssdev;
+			break;
+		}
+	}
+
+	return def_dssdev;
+}
+
+static int dpi_probe_pdata(struct platform_device *dpidev)
+{
+	struct omap_dss_device *plat_dssdev;
+	struct omap_dss_device *dssdev;
+	int r;
+
+	plat_dssdev = dpi_find_dssdev(dpidev);
+
+	if (!plat_dssdev)
+		return 0;
+
+	dssdev = dss_alloc_and_init_device(&dpidev->dev);
+	if (!dssdev)
+		return -ENOMEM;
+
+	dss_copy_device_pdata(dssdev, plat_dssdev);
+
+	r = dpi_init_display(dssdev);
+	if (r) {
+		DSSERR("device %s init failed: %d\n", dssdev->name, r);
+		dss_put_device(dssdev);
+		return r;
+	}
+
+	r = omapdss_output_set_device(&dpi.output, dssdev);
+	if (r) {
+		DSSERR("failed to connect output to new device: %s\n",
+				dssdev->name);
+		dss_put_device(dssdev);
+		return r;
+	}
+
+	r = dss_add_device(dssdev);
+	if (r) {
+		DSSERR("device %s register failed: %d\n", dssdev->name, r);
+		omapdss_output_unset_device(&dpi.output);
+		dss_put_device(dssdev);
+		return r;
+	}
+
+	return 0;
+}
+
+static void dpi_init_output(struct platform_device *pdev)
+{
+	struct omap_dss_output *out = &dpi.output;
+
+	out->pdev = pdev;
+	out->id = OMAP_DSS_OUTPUT_DPI;
+	out->type = OMAP_DISPLAY_TYPE_DPI;
+	out->name = "dpi.0";
+	out->dispc_channel = dpi_get_channel();
+
+	dss_register_output(out);
+}
+
+static void __exit dpi_uninit_output(struct platform_device *pdev)
+{
+	struct omap_dss_output *out = &dpi.output;
+
+	dss_unregister_output(out);
+}
+
+static int omap_dpi_probe(struct platform_device *pdev)
+{
+	int r;
+
+	mutex_init(&dpi.lock);
+
+	dpi_init_output(pdev);
+
+	r = dpi_probe_pdata(pdev);
+	if (r) {
+		dpi_uninit_output(pdev);
+		return r;
+	}
+
+	return 0;
+}
+
+static int __exit omap_dpi_remove(struct platform_device *pdev)
+{
+	dss_unregister_child_devices(&pdev->dev);
+
+	dpi_uninit_output(pdev);
+
+	return 0;
+}
+
+static struct platform_driver omap_dpi_driver = {
+	.probe		= omap_dpi_probe,
+	.remove         = __exit_p(omap_dpi_remove),
+	.driver         = {
+		.name   = "omapdss_dpi",
+		.owner  = THIS_MODULE,
+	},
+};
+
+int __init dpi_init_platform_driver(void)
+{
+	return platform_driver_register(&omap_dpi_driver);
+}
+
+void __exit dpi_uninit_platform_driver(void)
+{
+	platform_driver_unregister(&omap_dpi_driver);
+}