1 files changed, 409 insertions, 0 deletions
diff --git a/drivers/gpu/drm/omapdrm/dss/sdi.c b/drivers/gpu/drm/omapdrm/dss/sdi.c
new file mode 100644
index 000000000..69c3b7a3d
--- /dev/null
+++ b/drivers/gpu/drm/omapdrm/dss/sdi.c
@@ -0,0 +1,409 @@
+/*
+ * Copyright (C) 2009 Nokia Corporation
+ * Author: Tomi Valkeinen <tomi.valkeinen@ti.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/delay.h>
+#include <linux/err.h>
+#include <linux/regulator/consumer.h>
+#include <linux/export.h>
+#include <linux/platform_device.h>
+#include <linux/string.h>
+#include <linux/of.h>
+
+#include "omapdss.h"
+#include "dss.h"
+
+struct sdi_device {
+	struct platform_device *pdev;
+	struct dss_device *dss;
+
+	bool update_enabled;
+	struct regulator *vdds_sdi_reg;
+
+	struct dss_lcd_mgr_config mgr_config;
+	struct videomode vm;
+	int datapairs;
+
+	struct omap_dss_device output;
+};
+
+#define dssdev_to_sdi(dssdev) container_of(dssdev, struct sdi_device, output)
+
+struct sdi_clk_calc_ctx {
+	struct sdi_device *sdi;
+	unsigned long pck_min, pck_max;
+
+	unsigned long fck;
+	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 sdi_clk_calc_ctx *ctx = data;
+
+	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_dss_cb(unsigned long fck, void *data)
+{
+	struct sdi_clk_calc_ctx *ctx = data;
+
+	ctx->fck = fck;
+
+	return dispc_div_calc(ctx->sdi->dss->dispc, fck,
+			      ctx->pck_min, ctx->pck_max,
+			      dpi_calc_dispc_cb, ctx);
+}
+
+static int sdi_calc_clock_div(struct sdi_device *sdi, unsigned long pclk,
+			      unsigned long *fck,
+			      struct dispc_clock_info *dispc_cinfo)
+{
+	int i;
+	struct sdi_clk_calc_ctx ctx;
+
+	/*
+	 * DSS fclk 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
+	 * +/- 1MHz.
+	 */
+
+	for (i = 0; i < 10; ++i) {
+		bool ok;
+
+		memset(&ctx, 0, sizeof(ctx));
+
+		ctx.sdi = sdi;
+
+		if (pclk > 1000 * i * i * i)
+			ctx.pck_min = max(pclk - 1000 * i * i * i, 0lu);
+		else
+			ctx.pck_min = 0;
+		ctx.pck_max = pclk + 1000 * i * i * i;
+
+		ok = dss_div_calc(sdi->dss, pclk, ctx.pck_min,
+				  dpi_calc_dss_cb, &ctx);
+		if (ok) {
+			*fck = ctx.fck;
+			*dispc_cinfo = ctx.dispc_cinfo;
+			return 0;
+		}
+	}
+
+	return -EINVAL;
+}
+
+static void sdi_config_lcd_manager(struct sdi_device *sdi)
+{
+	sdi->mgr_config.io_pad_mode = DSS_IO_PAD_MODE_BYPASS;
+
+	sdi->mgr_config.stallmode = false;
+	sdi->mgr_config.fifohandcheck = false;
+
+	sdi->mgr_config.video_port_width = 24;
+	sdi->mgr_config.lcden_sig_polarity = 1;
+
+	dss_mgr_set_lcd_config(&sdi->output, &sdi->mgr_config);
+}
+
+static int sdi_display_enable(struct omap_dss_device *dssdev)
+{
+	struct sdi_device *sdi = dssdev_to_sdi(dssdev);
+	struct videomode *vm = &sdi->vm;
+	unsigned long fck;
+	struct dispc_clock_info dispc_cinfo;
+	unsigned long pck;
+	int r;
+
+	if (!sdi->output.dispc_channel_connected) {
+		DSSERR("failed to enable display: no output/manager\n");
+		return -ENODEV;
+	}
+
+	r = regulator_enable(sdi->vdds_sdi_reg);
+	if (r)
+		goto err_reg_enable;
+
+	r = dispc_runtime_get(sdi->dss->dispc);
+	if (r)
+		goto err_get_dispc;
+
+	/* 15.5.9.1.2 */
+	vm->flags |= DISPLAY_FLAGS_PIXDATA_POSEDGE | DISPLAY_FLAGS_SYNC_POSEDGE;
+
+	r = sdi_calc_clock_div(sdi, vm->pixelclock, &fck, &dispc_cinfo);
+	if (r)
+		goto err_calc_clock_div;
+
+	sdi->mgr_config.clock_info = dispc_cinfo;
+
+	pck = fck / dispc_cinfo.lck_div / dispc_cinfo.pck_div;
+
+	if (pck != vm->pixelclock) {
+		DSSWARN("Could not find exact pixel clock. Requested %lu Hz, got %lu Hz\n",
+			vm->pixelclock, pck);
+
+		vm->pixelclock = pck;
+	}
+
+
+	dss_mgr_set_timings(&sdi->output, vm);
+
+	r = dss_set_fck_rate(sdi->dss, fck);
+	if (r)
+		goto err_set_dss_clock_div;
+
+	sdi_config_lcd_manager(sdi);
+
+	/*
+	 * LCLK and PCLK divisors are located in shadow registers, and we
+	 * normally write them to DISPC registers when enabling the output.
+	 * However, SDI uses pck-free as source clock for its PLL, and pck-free
+	 * is affected by the divisors. And as we need the PLL before enabling
+	 * the output, we need to write the divisors early.
+	 *
+	 * It seems just writing to the DISPC register is enough, and we don't
+	 * need to care about the shadow register mechanism for pck-free. The
+	 * exact reason for this is unknown.
+	 */
+	dispc_mgr_set_clock_div(sdi->dss->dispc, sdi->output.dispc_channel,
+				&sdi->mgr_config.clock_info);
+
+	dss_sdi_init(sdi->dss, sdi->datapairs);
+	r = dss_sdi_enable(sdi->dss);
+	if (r)
+		goto err_sdi_enable;
+	mdelay(2);
+
+	r = dss_mgr_enable(&sdi->output);
+	if (r)
+		goto err_mgr_enable;
+
+	return 0;
+
+err_mgr_enable:
+	dss_sdi_disable(sdi->dss);
+err_sdi_enable:
+err_set_dss_clock_div:
+err_calc_clock_div:
+	dispc_runtime_put(sdi->dss->dispc);
+err_get_dispc:
+	regulator_disable(sdi->vdds_sdi_reg);
+err_reg_enable:
+	return r;
+}
+
+static void sdi_display_disable(struct omap_dss_device *dssdev)
+{
+	struct sdi_device *sdi = dssdev_to_sdi(dssdev);
+
+	dss_mgr_disable(&sdi->output);
+
+	dss_sdi_disable(sdi->dss);
+
+	dispc_runtime_put(sdi->dss->dispc);
+
+	regulator_disable(sdi->vdds_sdi_reg);
+}
+
+static void sdi_set_timings(struct omap_dss_device *dssdev,
+			    struct videomode *vm)
+{
+	struct sdi_device *sdi = dssdev_to_sdi(dssdev);
+
+	sdi->vm = *vm;
+}
+
+static void sdi_get_timings(struct omap_dss_device *dssdev,
+			    struct videomode *vm)
+{
+	struct sdi_device *sdi = dssdev_to_sdi(dssdev);
+
+	*vm = sdi->vm;
+}
+
+static int sdi_check_timings(struct omap_dss_device *dssdev,
+			     struct videomode *vm)
+{
+	struct sdi_device *sdi = dssdev_to_sdi(dssdev);
+	enum omap_channel channel = dssdev->dispc_channel;
+
+	if (!dispc_mgr_timings_ok(sdi->dss->dispc, channel, vm))
+		return -EINVAL;
+
+	if (vm->pixelclock == 0)
+		return -EINVAL;
+
+	return 0;
+}
+
+static int sdi_init_regulator(struct sdi_device *sdi)
+{
+	struct regulator *vdds_sdi;
+
+	if (sdi->vdds_sdi_reg)
+		return 0;
+
+	vdds_sdi = devm_regulator_get(&sdi->pdev->dev, "vdds_sdi");
+	if (IS_ERR(vdds_sdi)) {
+		if (PTR_ERR(vdds_sdi) != -EPROBE_DEFER)
+			DSSERR("can't get VDDS_SDI regulator\n");
+		return PTR_ERR(vdds_sdi);
+	}
+
+	sdi->vdds_sdi_reg = vdds_sdi;
+
+	return 0;
+}
+
+static int sdi_connect(struct omap_dss_device *dssdev,
+		struct omap_dss_device *dst)
+{
+	struct sdi_device *sdi = dssdev_to_sdi(dssdev);
+	int r;
+
+	r = sdi_init_regulator(sdi);
+	if (r)
+		return r;
+
+	r = dss_mgr_connect(&sdi->output, dssdev);
+	if (r)
+		return r;
+
+	r = omapdss_output_set_device(dssdev, dst);
+	if (r) {
+		DSSERR("failed to connect output to new device: %s\n",
+				dst->name);
+		dss_mgr_disconnect(&sdi->output, dssdev);
+		return r;
+	}
+
+	return 0;
+}
+
+static void sdi_disconnect(struct omap_dss_device *dssdev,
+		struct omap_dss_device *dst)
+{
+	struct sdi_device *sdi = dssdev_to_sdi(dssdev);
+
+	WARN_ON(dst != dssdev->dst);
+
+	if (dst != dssdev->dst)
+		return;
+
+	omapdss_output_unset_device(dssdev);
+
+	dss_mgr_disconnect(&sdi->output, dssdev);
+}
+
+static const struct omapdss_sdi_ops sdi_ops = {
+	.connect = sdi_connect,
+	.disconnect = sdi_disconnect,
+
+	.enable = sdi_display_enable,
+	.disable = sdi_display_disable,
+
+	.check_timings = sdi_check_timings,
+	.set_timings = sdi_set_timings,
+	.get_timings = sdi_get_timings,
+};
+
+static void sdi_init_output(struct sdi_device *sdi)
+{
+	struct omap_dss_device *out = &sdi->output;
+
+	out->dev = &sdi->pdev->dev;
+	out->id = OMAP_DSS_OUTPUT_SDI;
+	out->output_type = OMAP_DISPLAY_TYPE_SDI;
+	out->name = "sdi.0";
+	out->dispc_channel = OMAP_DSS_CHANNEL_LCD;
+	/* We have SDI only on OMAP3, where it's on port 1 */
+	out->port_num = 1;
+	out->ops.sdi = &sdi_ops;
+	out->owner = THIS_MODULE;
+
+	omapdss_register_output(out);
+}
+
+static void sdi_uninit_output(struct sdi_device *sdi)
+{
+	omapdss_unregister_output(&sdi->output);
+}
+
+int sdi_init_port(struct dss_device *dss, struct platform_device *pdev,
+		  struct device_node *port)
+{
+	struct sdi_device *sdi;
+	struct device_node *ep;
+	u32 datapairs;
+	int r;
+
+	sdi = kzalloc(sizeof(*sdi), GFP_KERNEL);
+	if (!sdi)
+		return -ENOMEM;
+
+	ep = of_get_next_child(port, NULL);
+	if (!ep) {
+		r = 0;
+		goto err_free;
+	}
+
+	r = of_property_read_u32(ep, "datapairs", &datapairs);
+	if (r) {
+		DSSERR("failed to parse datapairs\n");
+		goto err_datapairs;
+	}
+
+	sdi->datapairs = datapairs;
+	sdi->dss = dss;
+
+	of_node_put(ep);
+
+	sdi->pdev = pdev;
+	port->data = sdi;
+
+	sdi_init_output(sdi);
+
+	return 0;
+
+err_datapairs:
+	of_node_put(ep);
+err_free:
+	kfree(sdi);
+
+	return r;
+}
+
+void sdi_uninit_port(struct device_node *port)
+{
+	struct sdi_device *sdi = port->data;
+
+	if (!sdi)
+		return;
+
+	sdi_uninit_output(sdi);
+	kfree(sdi);
+}