[U-Boot] [PATCH v2 1/3] rockchip: video: mipi: Add rk3288 soc specific driver for mipi dsi

[Eric Gao]

Add rk3288 soc specific driver for mipi dsi.

Signed-off-by: Eric Gao <eric.gao at rock-chips.com>

---

Changes in v1:
-Change function name from rk_display_enable to rk_mipi_enable.
-Use IS_ERR to judge the return status.
-Use dev_read_addr to replace devfdt_get_addr.

 drivers/video/rockchip/rk3288_mipi.c | 191 +++++++++++++++++++++++++++++++++++
 1 file changed, 191 insertions(+)
 create mode 100644 drivers/video/rockchip/rk3288_mipi.c

diff --git a/drivers/video/rockchip/rk3288_mipi.c b/drivers/video/rockchip/rk3288_mipi.c
new file mode 100644
index 0000000..a0d3544
--- /dev/null
+++ b/drivers/video/rockchip/rk3288_mipi.c
@@ -0,0 +1,191 @@
+/*
+ * Copyright (c) 2017, Fuzhou Rockchip Electronics Co., Ltd
+ * Author: Eric Gao <eric.gao at rock-chips.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <clk.h>
+#include <display.h>
+#include <dm.h>
+#include <fdtdec.h>
+#include <panel.h>
+#include <regmap.h>
+#include "rk_mipi.h"
+#include <syscon.h>
+#include <asm/gpio.h>
+#include <asm/hardware.h>
+#include <asm/io.h>
+#include <dm/uclass-internal.h>
+#include <linux/kernel.h>
+#include <asm/arch/clock.h>
+#include <asm/arch/cru_rk3288.h>
+#include <asm/arch/grf_rk3288.h>
+#include <asm/arch/rockchip_mipi_dsi.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+#define MHz 1000000
+
+/* Select mipi dsi source, big or little vop */
+static int rk_mipi_dsi_source_select(struct udevice *dev)
+{
+	struct rk_mipi_priv *priv = dev_get_priv(dev);
+	struct rk3288_grf *grf = priv->grf;
+	struct display_plat *disp_uc_plat = dev_get_uclass_platdata(dev);
+
+	/* Select the video source */
+	switch (disp_uc_plat->source_id) {
+	case VOP_B:
+		rk_clrsetreg(&grf->soc_con6, RK3288_DSI0_LCDC_SEL_MASK,
+			     RK3288_DSI0_LCDC_SEL_BIG
+			     << RK3288_DSI0_LCDC_SEL_SHIFT);
+		break;
+	case VOP_L:
+		rk_clrsetreg(&grf->soc_con6, RK3288_DSI0_LCDC_SEL_MASK,
+			     RK3288_DSI0_LCDC_SEL_LIT
+			     << RK3288_DSI0_LCDC_SEL_SHIFT);
+		break;
+	default:
+		debug("%s: Invalid VOP id\n", __func__);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+/* Setup mipi dphy working mode */
+static void rk_mipi_dphy_mode_set(struct udevice *dev)
+{
+	struct rk_mipi_priv *priv = dev_get_priv(dev);
+	struct rk3288_grf *grf = priv->grf;
+	int val;
+
+	/* Set Controller as TX mode */
+	val = RK3288_DPHY_TX0_RXMODE_DIS << RK3288_DPHY_TX0_RXMODE_SHIFT;
+	rk_clrsetreg(&grf->soc_con8, RK3288_DPHY_TX0_RXMODE_MASK, val);
+
+	/* Exit tx stop mode */
+	val |= RK3288_DPHY_TX0_TXSTOPMODE_EN
+			<< RK3288_DPHY_TX0_TXSTOPMODE_SHIFT;
+	rk_clrsetreg(&grf->soc_con8,
+		     RK3288_DPHY_TX0_TXSTOPMODE_MASK, val);
+
+	/* Disable turnequest */
+	val |= RK3288_DPHY_TX0_TURNREQUEST_EN
+		<< RK3288_DPHY_TX0_TURNREQUEST_SHIFT;
+	rk_clrsetreg(&grf->soc_con8,
+		     RK3288_DPHY_TX0_TURNREQUEST_MASK, val);
+}
+
+/*
+ * This function is called by rk_display_init() using rk_mipi_dsi_enable() and
+ * rk_mipi_phy_enable() to initialize mipi controller and dphy. If success,
+ * enable backlight.
+ */
+static int rk_mipi_enable(struct udevice *dev, int panel_bpp,
+			  const struct display_timing *timing)
+{
+	int ret;
+	struct rk_mipi_priv *priv = dev_get_priv(dev);
+
+	/* Fill the mipi controller parameter */
+	priv->ref_clk = 24 * MHz;
+	priv->sys_clk = priv->ref_clk;
+	priv->pix_clk = timing->pixelclock.typ;
+	priv->phy_clk = priv->pix_clk * 6;
+	priv->txbyte_clk = priv->phy_clk / 8;
+	priv->txesc_clk = 20 * MHz;
+
+	/* Select vop port, big or little */
+	rk_mipi_dsi_source_select(dev);
+
+	/* Set mipi dphy work mode */
+	rk_mipi_dphy_mode_set(dev);
+
+	/* Config  and enable mipi dsi according to timing */
+	ret = rk_mipi_dsi_enable(dev, timing);
+	if (ret) {
+		debug("%s: rk_mipi_dsi_enable() failed (err=%d)\n",
+		      __func__, ret);
+		return ret;
+	}
+
+	/* Config and enable mipi phy */
+	ret = rk_mipi_phy_enable(dev);
+	if (ret) {
+		debug("%s: rk_mipi_phy_enable() failed (err=%d)\n",
+		      __func__, ret);
+		return ret;
+	}
+
+	/* Enable backlight */
+	ret = panel_enable_backlight(priv->panel);
+	if (ret) {
+		debug("%s: panel_enable_backlight() failed (err=%d)\n",
+		      __func__, ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int rk_mipi_ofdata_to_platdata(struct udevice *dev)
+{
+	struct rk_mipi_priv *priv = dev_get_priv(dev);
+
+	priv->grf = syscon_get_first_range(ROCKCHIP_SYSCON_GRF);
+	if (IS_ERR(priv->grf)) {
+		debug("%s: Get syscon grf failed (ret=%p)\n",
+		      __func__, priv->grf);
+		return  -ENXIO;
+	}
+	priv->regs = (void *)dev_read_addr(dev);
+	if (priv->regs == FDT_ADDR_T_NONE) {
+		debug("%s: Get MIPI dsi address failed (ret=%p)\n", __func__,
+		      priv->regs);
+		return  -ENXIO;
+	}
+
+	return 0;
+}
+
+/*
+ * Probe function: check panel existence and readingit's timing. Then config
+ * mipi dsi controller and enable it according to the timing parameter.
+ */
+static int rk_mipi_probe(struct udevice *dev)
+{
+	int ret;
+	struct rk_mipi_priv *priv = dev_get_priv(dev);
+
+	ret = uclass_get_device_by_phandle(UCLASS_PANEL, dev, "rockchip,panel",
+					   &priv->panel);
+	if (ret) {
+		debug("%s: Can not find panel (err=%d)\n", __func__, ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+static const struct dm_display_ops rk_mipi_dsi_ops = {
+	.read_timing = rk_mipi_read_timing,
+	.enable = rk_mipi_enable,
+};
+
+static const struct udevice_id rk_mipi_dsi_ids[] = {
+	{ .compatible = "rockchip,rk3288_mipi_dsi" },
+	{ }
+};
+
+U_BOOT_DRIVER(rk_mipi_dsi) = {
+	.name	= "rk_mipi_dsi",
+	.id	= UCLASS_DISPLAY,
+	.of_match = rk_mipi_dsi_ids,
+	.ofdata_to_platdata = rk_mipi_ofdata_to_platdata,
+	.probe	= rk_mipi_probe,
+	.ops	= &rk_mipi_dsi_ops,
+	.priv_auto_alloc_size   = sizeof(struct rk_mipi_priv),
+};
-- 
1.9.1