[PATCH 27/29] video: i.MX IPUv3: Add lvds bridge support
Sascha Hauer
s.hauer at pengutronix.de
Fri Mar 14 10:32:47 EDT 2014
Signed-off-by: Sascha Hauer <s.hauer at pengutronix.de>
---
drivers/video/imx-ipu-v3/Kconfig | 3 +
drivers/video/imx-ipu-v3/Makefile | 1 +
drivers/video/imx-ipu-v3/imx-ldb.c | 310 +++++++++++++++++++++++++++++++++++++
3 files changed, 314 insertions(+)
create mode 100644 drivers/video/imx-ipu-v3/imx-ldb.c
diff --git a/drivers/video/imx-ipu-v3/Kconfig b/drivers/video/imx-ipu-v3/Kconfig
index 84ef363..e83158a 100644
--- a/drivers/video/imx-ipu-v3/Kconfig
+++ b/drivers/video/imx-ipu-v3/Kconfig
@@ -5,4 +5,7 @@ config DRIVER_VIDEO_IMX_IPUV3
if DRIVER_VIDEO_IMX_IPUV3
+config DRIVER_VIDEO_IMX_IPUV3_LVDS
+ bool "IPUv3 LVDS support"
+
endif
diff --git a/drivers/video/imx-ipu-v3/Makefile b/drivers/video/imx-ipu-v3/Makefile
index 0edc1a4..e2ff43d 100644
--- a/drivers/video/imx-ipu-v3/Makefile
+++ b/drivers/video/imx-ipu-v3/Makefile
@@ -1,3 +1,4 @@
obj-$(CONFIG_DRIVER_VIDEO_IMX_IPUV3) += ipu-common.o ipu-dmfc.o ipu-di.o
obj-$(CONFIG_DRIVER_VIDEO_IMX_IPUV3) += ipu-dp.o ipuv3-plane.o ipufb.o
obj-$(CONFIG_DRIVER_VIDEO_IMX_IPUV3) += ipu-dc.o
+obj-$(CONFIG_DRIVER_VIDEO_IMX_IPUV3_LVDS) += imx-ldb.o
diff --git a/drivers/video/imx-ipu-v3/imx-ldb.c b/drivers/video/imx-ipu-v3/imx-ldb.c
new file mode 100644
index 0000000..7367fbe
--- /dev/null
+++ b/drivers/video/imx-ipu-v3/imx-ldb.c
@@ -0,0 +1,310 @@
+/*
+ * i.MX drm driver - parallel display implementation
+ *
+ * Copyright (C) 2012 Sascha Hauer, Pengutronix
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ * 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 <common.h>
+#include <fb.h>
+#include <io.h>
+#include <driver.h>
+#include <malloc.h>
+#include <errno.h>
+#include <init.h>
+#include <linux/clk.h>
+#include <linux/err.h>
+#include <asm-generic/div64.h>
+#include <linux/clk.h>
+#include <mach/imx6-regs.h>
+#include <mach/imx53-regs.h>
+
+#include "imx-ipu-v3.h"
+#include "ipuv3-plane.h"
+
+#define LDB_CH0_MODE_EN_TO_DI0 (1 << 0)
+#define LDB_CH0_MODE_EN_TO_DI1 (3 << 0)
+#define LDB_CH0_MODE_EN_MASK (3 << 0)
+#define LDB_CH1_MODE_EN_TO_DI0 (1 << 2)
+#define LDB_CH1_MODE_EN_TO_DI1 (3 << 2)
+#define LDB_CH1_MODE_EN_MASK (3 << 2)
+#define LDB_SPLIT_MODE_EN (1 << 4)
+#define LDB_DATA_WIDTH_CH0_24 (1 << 5)
+#define LDB_BIT_MAP_CH0_JEIDA (1 << 6)
+#define LDB_DATA_WIDTH_CH1_24 (1 << 7)
+#define LDB_BIT_MAP_CH1_JEIDA (1 << 8)
+#define LDB_DI0_VS_POL_ACT_LOW (1 << 9)
+#define LDB_DI1_VS_POL_ACT_LOW (1 << 10)
+#define LDB_BGREF_RMODE_INT (1 << 15)
+
+struct imx_ldb;
+
+struct imx_ldb_channel {
+ struct imx_ldb *ldb;
+ int chno;
+ int mode_valid;
+ struct display_timings *modes;
+ struct ipu_output output;
+};
+
+struct imx_ldb_data {
+ void __iomem *base;
+ int (*prepare)(struct imx_ldb_channel *imx_ldb_ch, int di);
+ unsigned ipu_mask;
+};
+
+struct imx_ldb {
+ struct device_d *dev;
+ u32 interface_pix_fmt;
+ int mode_valid;
+ struct imx_ldb_channel channel[2];
+ u32 ldb_ctrl;
+ void __iomem *base;
+ const struct imx_ldb_data *soc_data;
+};
+
+enum {
+ LVDS_BIT_MAP_SPWG,
+ LVDS_BIT_MAP_JEIDA
+};
+
+static const char * const imx_ldb_bit_mappings[] = {
+ [LVDS_BIT_MAP_SPWG] = "spwg",
+ [LVDS_BIT_MAP_JEIDA] = "jeida",
+};
+
+static const int of_get_data_mapping(struct device_node *np)
+{
+ const char *bm;
+ int ret, i;
+
+ ret = of_property_read_string(np, "fsl,data-mapping", &bm);
+ if (ret < 0)
+ return ret;
+
+ for (i = 0; i < ARRAY_SIZE(imx_ldb_bit_mappings); i++)
+ if (!strcasecmp(bm, imx_ldb_bit_mappings[i]))
+ return i;
+
+ return -EINVAL;
+}
+
+static int imx_ldb_prepare(struct ipu_output *output, struct fb_videomode *mode, int di)
+{
+ struct imx_ldb_channel *imx_ldb_ch = container_of(output, struct imx_ldb_channel, output);
+ struct imx_ldb *ldb = imx_ldb_ch->ldb;
+
+ if (PICOS2KHZ(mode->pixclock) > 85000) {
+ dev_warn(ldb->dev,
+ "%s: mode exceeds 85 MHz pixel clock\n", __func__);
+ }
+
+ ldb->soc_data->prepare(imx_ldb_ch, di);
+
+ /* FIXME - assumes straight connections DI0 --> CH0, DI1 --> CH1 */
+ if (imx_ldb_ch == &ldb->channel[0]) {
+ if (mode->sync & FB_SYNC_VERT_HIGH_ACT)
+ ldb->ldb_ctrl |= LDB_DI0_VS_POL_ACT_LOW;
+ else
+ ldb->ldb_ctrl &= ~LDB_DI0_VS_POL_ACT_LOW;
+ }
+
+ if (imx_ldb_ch == &ldb->channel[1]) {
+ if (mode->sync & FB_SYNC_VERT_HIGH_ACT)
+ ldb->ldb_ctrl |= LDB_DI1_VS_POL_ACT_LOW;
+ else
+ ldb->ldb_ctrl &= ~LDB_DI1_VS_POL_ACT_LOW;
+ }
+
+ if (imx_ldb_ch == &ldb->channel[0]) {
+ ldb->ldb_ctrl &= ~LDB_CH0_MODE_EN_MASK;
+ ldb->ldb_ctrl |= LDB_CH0_MODE_EN_TO_DI0;
+ }
+
+ if (imx_ldb_ch == &ldb->channel[1]) {
+ ldb->ldb_ctrl &= ~LDB_CH1_MODE_EN_MASK;
+ ldb->ldb_ctrl |= LDB_CH1_MODE_EN_TO_DI1;
+ }
+
+ writel(ldb->ldb_ctrl, ldb->base);
+
+ return 0;
+}
+
+static int imx6q_ldb_prepare(struct imx_ldb_channel *imx_ldb_ch, int di)
+{
+ struct clk *diclk, *ldbclk;
+ struct imx_ldb *ldb = imx_ldb_ch->ldb;
+ int ret, ipuno, dino;
+ char *clkname;
+ void __iomem *gpr3 = (void *)MX6_IOMUXC_BASE_ADDR + 0xc;
+ uint32_t val;
+ int shift;
+
+ ipuno = ((di >> 1) & 1) + 1;
+ dino = di & 0x1;
+
+ clkname = asprintf("ipu%d_di%d_sel", ipuno, dino);
+ diclk = clk_lookup(clkname);
+ free(clkname);
+ if (IS_ERR(diclk)) {
+ dev_err(ldb->dev, "failed to get di clk: %s\n", strerror(PTR_ERR(diclk)));
+ return PTR_ERR(diclk);
+ }
+
+ clkname = asprintf("ldb_di%d_podf", imx_ldb_ch->chno);
+ ldbclk = clk_lookup(clkname);
+ free(clkname);
+ if (IS_ERR(ldbclk)) {
+ dev_err(ldb->dev, "failed to get ldb clk: %s\n", strerror(PTR_ERR(ldbclk)));
+ return PTR_ERR(ldbclk);
+ }
+
+ ret = clk_set_parent(diclk, ldbclk);
+ if (ret) {
+ dev_err(ldb->dev, "failed to set display clock parent: %s\n", strerror(-ret));
+ return ret;
+ }
+printk("%s: %d\n", __func__, di);
+ val = readl(gpr3);
+ shift = (imx_ldb_ch->chno == 0) ? 6 : 8;
+ val &= ~(3 << shift);
+ val |= di << shift;
+ writel(val, gpr3);
+
+ return 0;
+}
+
+static int imx53_ldb_prepare(struct imx_ldb_channel *imx_ldb_ch, int di)
+{
+ return -ENOSYS;
+}
+
+static struct imx_ldb_data imx_ldb_data_imx6q = {
+ .base = (void *)MX6_IOMUXC_BASE_ADDR + 0x8,
+ .prepare = imx6q_ldb_prepare,
+ .ipu_mask = 0xf,
+};
+
+static struct imx_ldb_data imx_ldb_data_imx53 = {
+ .base = (void *)MX53_IOMUXC_BASE_ADDR + 0x8,
+ .prepare = imx53_ldb_prepare,
+ .ipu_mask = 0x3,
+};
+
+static struct ipu_output_ops imx_ldb_ops = {
+ .prepare = imx_ldb_prepare,
+};
+
+static int imx_ldb_probe(struct device_d *dev)
+{
+ struct device_node *np = dev->device_node;
+ struct device_node *child;
+ struct imx_ldb *imx_ldb;
+ int ret, i;
+ int dual = 0;
+ int datawidth;
+ int mapping;
+ const struct imx_ldb_data *devtype;
+
+ ret = dev_get_drvdata(dev, (unsigned long *)&devtype);
+ if (ret)
+ return ret;
+
+ imx_ldb = xzalloc(sizeof(*imx_ldb));
+ imx_ldb->base = devtype->base;
+ imx_ldb->soc_data = devtype;
+
+ for_each_child_of_node(np, child) {
+ struct imx_ldb_channel *channel;
+
+ ret = of_property_read_u32(child, "reg", &i);
+ if (ret || i < 0 || i > 1)
+ return -EINVAL;
+
+ if (dual && i > 0) {
+ dev_warn(dev, "dual-channel mode, ignoring second output\n");
+ continue;
+ }
+
+ if (!of_device_is_available(child))
+ continue;
+
+ channel = &imx_ldb->channel[i];
+ channel->ldb = imx_ldb;
+ channel->chno = i;
+
+ ret = of_property_read_u32(child, "fsl,data-width", &datawidth);
+ if (ret)
+ datawidth = 0;
+ else if (datawidth != 18 && datawidth != 24)
+ return -EINVAL;
+
+ mapping = of_get_data_mapping(child);
+ switch (mapping) {
+ case LVDS_BIT_MAP_SPWG:
+ if (datawidth == 24) {
+ if (i == 0 || dual)
+ imx_ldb->ldb_ctrl |= LDB_DATA_WIDTH_CH0_24;
+ if (i == 1 || dual)
+ imx_ldb->ldb_ctrl |= LDB_DATA_WIDTH_CH1_24;
+ }
+ break;
+ case LVDS_BIT_MAP_JEIDA:
+ if (datawidth == 18) {
+ dev_err(dev, "JEIDA standard only supported in 24 bit\n");
+ return -EINVAL;
+ }
+ if (i == 0 || dual)
+ imx_ldb->ldb_ctrl |= LDB_DATA_WIDTH_CH0_24 | LDB_BIT_MAP_CH0_JEIDA;
+ if (i == 1 || dual)
+ imx_ldb->ldb_ctrl |= LDB_DATA_WIDTH_CH1_24 | LDB_BIT_MAP_CH1_JEIDA;
+ break;
+ default:
+ dev_err(dev, "data mapping not specified or invalid\n");
+ return -EINVAL;
+ }
+
+ channel->output.ops = &imx_ldb_ops;
+ channel->output.di_clkflags = IPU_DI_CLKMODE_EXT | IPU_DI_CLKMODE_SYNC;
+ channel->output.out_pixel_fmt = (datawidth == 24) ?
+ V4L2_PIX_FMT_RGB24 : V4L2_PIX_FMT_BGR666;
+ channel->output.modes = of_get_display_timings(child);
+ channel->output.name = asprintf("ldb-%d", i);
+ channel->output.ipu_mask = devtype->ipu_mask;
+
+ ipu_register_output(&channel->output);
+ }
+
+ return 0;
+}
+
+static struct of_device_id imx_ldb_dt_ids[] = {
+ { .compatible = "fsl,imx6q-ldb", (unsigned long)&imx_ldb_data_imx6q},
+ { .compatible = "fsl,imx53-ldb", (unsigned long)&imx_ldb_data_imx53},
+ { /* sentinel */ }
+};
+
+static struct driver_d imx_ldb_driver = {
+ .probe = imx_ldb_probe,
+ .of_compatible = imx_ldb_dt_ids,
+ .name = "imx-ldb",
+};
+device_platform_driver(imx_ldb_driver);
+
+MODULE_DESCRIPTION("i.MX LVDS display driver");
+MODULE_AUTHOR("Sascha Hauer, Pengutronix");
+MODULE_LICENSE("GPL");
--
1.9.0
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