[PATCH v4 3/8] drm/exynos: mic: add MIC driver
Hyungwon Hwang
human.hwang at samsung.com
Tue Apr 7 04:57:33 PDT 2015
MIC(Mobile image compressor) is newly added IP in Exynos5433. MIC
resides between decon and mipi dsim, and compresses frame data by 50%.
With dsi, not display port, to send frame data to the panel, the
bandwidth is not enough. That is why this compressor is introduced.
Signed-off-by: Hyungwon Hwang <human.hwang at samsung.com>
---
Changes for v2:
- make mic driver to be registered by exynos drm driver instead as a module
driver
- change the description of mic driver in documentation
- add module author at the top of the source file removing MODULE_OWNER,
MODULE_DESCRIPTION, MODULE_LICENSE
Changes for v3:
- move if statement out of function, so that the function is not called
unnecessarily
- Make it use syscon framework for controlling system register
Changes for v4:
- None
.../devicetree/bindings/video/exynos-mic.txt | 51 +++
drivers/gpu/drm/exynos/Kconfig | 6 +
drivers/gpu/drm/exynos/Makefile | 1 +
drivers/gpu/drm/exynos/exynos_drm_drv.c | 3 +
drivers/gpu/drm/exynos/exynos_drm_drv.h | 1 +
drivers/gpu/drm/exynos/exynos_drm_mic.c | 490 +++++++++++++++++++++
6 files changed, 552 insertions(+)
create mode 100644 Documentation/devicetree/bindings/video/exynos-mic.txt
create mode 100644 drivers/gpu/drm/exynos/exynos_drm_mic.c
diff --git a/Documentation/devicetree/bindings/video/exynos-mic.txt b/Documentation/devicetree/bindings/video/exynos-mic.txt
new file mode 100644
index 0000000..0fba2ee
--- /dev/null
+++ b/Documentation/devicetree/bindings/video/exynos-mic.txt
@@ -0,0 +1,51 @@
+Device-Tree bindings for Samsung Exynos SoC mobile image compressor (MIC)
+
+MIC (mobile image compressor) resides between decon and mipi dsi. Mipi dsi is
+not capable to transfer high resoltuion frame data as decon can send. MIC
+solves this problem by compressing the frame data by 1/2 before it is
+transferred through mipi dsi. The compressed frame data must be uncompressed in
+the panel PCB.
+
+Required properties:
+- compatible: value should be "samsung,exynos5433-mic".
+- reg: physical base address and length of the MIC registers set and system
+ register of mic.
+- clocks: must include clock specifiers corresponding to entries in the
+ clock-names property.
+- clock-names: list of clock names sorted in the same order as the clocks
+ property. Must contain "pclk_mic0", "sclk_rgb_vclk_to_mic0".
+- samsung,disp-syscon: the reference node for syscon for DISP block.
+- ports: contains a port which is connected to decon node and dsi node.
+ address-cells and size-cells must 1 and 0, respectively.
+- port: contains an endpoint node which is connected to the endpoint in the
+ decon node or dsi node. The reg value must be 0 and 1 respectively.
+
+Example:
+SoC specific DT entry:
+mic: mic at 13930000 {
+ compatible = "samsung,exynos5433-mic";
+ reg = <0x13930000 0x48>;
+ clocks = <&cmu_disp CLK_PCLK_MIC0>,
+ <&cmu_disp CLK_SCLK_RGB_VCLK_TO_MIC0>;
+ clock-names = "pclk_mic0", "sclk_rgb_vclk_to_mic0";
+ samsung,disp-syscon = <&syscon_disp>;
+
+ ports {
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ port at 0 {
+ reg = <0>;
+ mic_to_decon: endpoint {
+ remote-endpoint = <&decon_to_mic>;
+ };
+ };
+
+ port at 1 {
+ reg = <1>;
+ mic_to_dsi: endpoint {
+ remote-endpoint = <&dsi_to_mic>;
+ };
+ };
+ };
+};
diff --git a/drivers/gpu/drm/exynos/Kconfig b/drivers/gpu/drm/exynos/Kconfig
index dd6ae21..3f649ab 100644
--- a/drivers/gpu/drm/exynos/Kconfig
+++ b/drivers/gpu/drm/exynos/Kconfig
@@ -103,3 +103,9 @@ config DRM_EXYNOS_GSC
depends on DRM_EXYNOS_IPP && ARCH_EXYNOS5 && !ARCH_MULTIPLATFORM
help
Choose this option if you want to use Exynos GSC for DRM.
+
+config DRM_EXYNOS_MIC
+ bool "Exynos DRM MIC"
+ depends on (DRM_EXYNOS && DRM_EXYNOS5433_DECON)
+ help
+ Choose this option if you want to use Exynos MIC for DRM.
diff --git a/drivers/gpu/drm/exynos/Makefile b/drivers/gpu/drm/exynos/Makefile
index fbd084d..7de0b10 100644
--- a/drivers/gpu/drm/exynos/Makefile
+++ b/drivers/gpu/drm/exynos/Makefile
@@ -22,5 +22,6 @@ exynosdrm-$(CONFIG_DRM_EXYNOS_IPP) += exynos_drm_ipp.o
exynosdrm-$(CONFIG_DRM_EXYNOS_FIMC) += exynos_drm_fimc.o
exynosdrm-$(CONFIG_DRM_EXYNOS_ROTATOR) += exynos_drm_rotator.o
exynosdrm-$(CONFIG_DRM_EXYNOS_GSC) += exynos_drm_gsc.o
+exynosdrm-$(CONFIG_DRM_EXYNOS_MIC) += exynos_drm_mic.o
obj-$(CONFIG_DRM_EXYNOS) += exynosdrm.o
diff --git a/drivers/gpu/drm/exynos/exynos_drm_drv.c b/drivers/gpu/drm/exynos/exynos_drm_drv.c
index 78ef497..105fc1a 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_drv.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_drv.c
@@ -535,6 +535,9 @@ static struct platform_driver *const exynos_drm_kms_drivers[] = {
#ifdef CONFIG_DRM_EXYNOS7_DECON
&decon_driver,
#endif
+#ifdef CONFIG_DRM_EXYNOS_MIC
+ &mic_driver,
+#endif
#ifdef CONFIG_DRM_EXYNOS_DP
&dp_driver,
#endif
diff --git a/drivers/gpu/drm/exynos/exynos_drm_drv.h b/drivers/gpu/drm/exynos/exynos_drm_drv.h
index 405f098..cb1568c 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_drv.h
+++ b/drivers/gpu/drm/exynos/exynos_drm_drv.h
@@ -351,4 +351,5 @@ extern struct platform_driver fimc_driver;
extern struct platform_driver rotator_driver;
extern struct platform_driver gsc_driver;
extern struct platform_driver ipp_driver;
+extern struct platform_driver mic_driver;
#endif
diff --git a/drivers/gpu/drm/exynos/exynos_drm_mic.c b/drivers/gpu/drm/exynos/exynos_drm_mic.c
new file mode 100644
index 0000000..8994eab
--- /dev/null
+++ b/drivers/gpu/drm/exynos/exynos_drm_mic.c
@@ -0,0 +1,490 @@
+/*
+ * Copyright (C) 2015 Samsung Electronics Co.Ltd
+ * Authors:
+ * Hyungwon Hwang <human.hwang at samsung.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 Foundationr
+ */
+
+#include <linux/platform_device.h>
+#include <video/of_videomode.h>
+#include <linux/of_address.h>
+#include <video/videomode.h>
+#include <linux/module.h>
+#include <linux/delay.h>
+#include <linux/mutex.h>
+#include <linux/of.h>
+#include <linux/of_graph.h>
+#include <linux/clk.h>
+#include <drm/drmP.h>
+#include <linux/mfd/syscon.h>
+#include <linux/regmap.h>
+
+/* Sysreg registers for MIC */
+#define DSD_CFG_MUX 0x1004
+#define MIC0_RGB_MUX (1 << 0)
+#define MIC0_I80_MUX (1 << 1)
+#define MIC0_ON_MUX (1 << 5)
+
+/* MIC registers */
+#define MIC_OP 0x0
+#define MIC_IP_VER 0x0004
+#define MIC_V_TIMING_0 0x0008
+#define MIC_V_TIMING_1 0x000C
+#define MIC_IMG_SIZE 0x0010
+#define MIC_INPUT_TIMING_0 0x0014
+#define MIC_INPUT_TIMING_1 0x0018
+#define MIC_2D_OUTPUT_TIMING_0 0x001C
+#define MIC_2D_OUTPUT_TIMING_1 0x0020
+#define MIC_2D_OUTPUT_TIMING_2 0x0024
+#define MIC_3D_OUTPUT_TIMING_0 0x0028
+#define MIC_3D_OUTPUT_TIMING_1 0x002C
+#define MIC_3D_OUTPUT_TIMING_2 0x0030
+#define MIC_CORE_PARA_0 0x0034
+#define MIC_CORE_PARA_1 0x0038
+#define MIC_CTC_CTRL 0x0040
+#define MIC_RD_DATA 0x0044
+
+#define MIC_UPD_REG (1 << 31)
+#define MIC_ON_REG (1 << 30)
+#define MIC_TD_ON_REG (1 << 29)
+#define MIC_BS_CHG_OUT (1 << 16)
+#define MIC_VIDEO_TYPE(x) (((x) & 0xf) << 12)
+#define MIC_PSR_EN (1 << 5)
+#define MIC_SW_RST (1 << 4)
+#define MIC_ALL_RST (1 << 3)
+#define MIC_CORE_VER_CONTROL (1 << 2)
+#define MIC_MODE_SEL_COMMAND_MODE (1 << 1)
+#define MIC_MODE_SEL_MASK (1 << 1)
+#define MIC_CORE_EN (1 << 0)
+
+#define MIC_V_PULSE_WIDTH(x) (((x) & 0x3fff) << 16)
+#define MIC_V_PERIOD_LINE(x) ((x) & 0x3fff)
+
+#define MIC_VBP_SIZE(x) (((x) & 0x3fff) << 16)
+#define MIC_VFP_SIZE(x) ((x) & 0x3fff)
+
+#define MIC_IMG_V_SIZE(x) (((x) & 0x3fff) << 16)
+#define MIC_IMG_H_SIZE(x) ((x) & 0x3fff)
+
+#define MIC_H_PULSE_WIDTH_IN(x) (((x) & 0x3fff) << 16)
+#define MIC_H_PERIOD_PIXEL_IN(x) ((x) & 0x3fff)
+
+#define MIC_HBP_SIZE_IN(x) (((x) & 0x3fff) << 16)
+#define MIC_HFP_SIZE_IN(x) ((x) & 0x3fff)
+
+#define MIC_H_PULSE_WIDTH_2D(x) (((x) & 0x3fff) << 16)
+#define MIC_H_PERIOD_PIXEL_2D(x) ((x) & 0x3fff)
+
+#define MIC_HBP_SIZE_2D(x) (((x) & 0x3fff) << 16)
+#define MIC_HFP_SIZE_2D(x) ((x) & 0x3fff)
+
+#define MIC_BS_SIZE_2D(x) ((x) & 0x3fff)
+
+enum {
+ ENDPOINT_DECON_NODE,
+ ENDPOINT_DSI_NODE,
+ NUM_ENDPOINTS
+};
+
+static char *clk_names[] = { "pclk_mic0", "sclk_rgb_vclk_to_mic0" };
+#define NUM_CLKS ARRAY_SIZE(clk_names)
+static DEFINE_MUTEX(mic_mutex);
+
+struct exynos_mic {
+ struct device *dev;
+ void __iomem *reg;
+ struct regmap *sysreg;
+ struct clk *clks[NUM_CLKS];
+
+ bool i80_mode;
+ struct videomode vm;
+ struct drm_encoder *encoder;
+ struct drm_bridge bridge;
+
+ bool enabled;
+};
+
+static void mic_set_path(struct exynos_mic *mic, bool enable)
+{
+ int ret;
+ unsigned int val;
+
+ ret = regmap_read(mic->sysreg, DSD_CFG_MUX, &val);
+ if (ret) {
+ DRM_ERROR("mic: Failed to read system register\n");
+ return;
+ }
+
+ if (enable) {
+ if (mic->i80_mode)
+ val |= MIC0_I80_MUX;
+ else
+ val |= MIC0_RGB_MUX;
+
+ val |= MIC0_ON_MUX;
+ } else
+ val &= ~(MIC0_RGB_MUX | MIC0_I80_MUX | MIC0_ON_MUX);
+
+ regmap_write(mic->sysreg, DSD_CFG_MUX, val);
+ if (ret)
+ DRM_ERROR("mic: Failed to read system register\n");
+}
+
+static int mic_sw_reset(struct exynos_mic *mic)
+{
+ unsigned int retry = 100;
+ int ret;
+
+ writel(MIC_SW_RST, mic->reg + MIC_OP);
+
+ while (retry-- > 0) {
+ ret = readl(mic->reg + MIC_OP);
+ if (!(ret & MIC_SW_RST))
+ return 0;
+
+ udelay(10);
+ }
+
+ return -ETIMEDOUT;
+}
+
+static void mic_set_porch_timing(struct exynos_mic *mic)
+{
+ struct videomode vm = mic->vm;
+ u32 reg;
+
+ reg = MIC_V_PULSE_WIDTH(vm.vsync_len) +
+ MIC_V_PERIOD_LINE(vm.vsync_len + vm.vactive +
+ vm.vback_porch + vm.vfront_porch);
+ writel(reg, mic->reg + MIC_V_TIMING_0);
+
+ reg = MIC_VBP_SIZE(vm.vback_porch) +
+ MIC_VFP_SIZE(vm.vfront_porch);
+ writel(reg, mic->reg + MIC_V_TIMING_1);
+
+ reg = MIC_V_PULSE_WIDTH(vm.hsync_len) +
+ MIC_V_PERIOD_LINE(vm.hsync_len + vm.hactive +
+ vm.hback_porch + vm.hfront_porch);
+ writel(reg, mic->reg + MIC_INPUT_TIMING_0);
+
+ reg = MIC_VBP_SIZE(vm.hback_porch) +
+ MIC_VFP_SIZE(vm.hfront_porch);
+ writel(reg, mic->reg + MIC_INPUT_TIMING_1);
+}
+
+static void mic_set_img_size(struct exynos_mic *mic)
+{
+ struct videomode *vm = &mic->vm;
+ u32 reg;
+
+ reg = MIC_IMG_H_SIZE(vm->hactive) +
+ MIC_IMG_V_SIZE(vm->vactive);
+
+ writel(reg, mic->reg + MIC_IMG_SIZE);
+}
+
+static void mic_set_output_timing(struct exynos_mic *mic)
+{
+ struct videomode vm = mic->vm;
+ u32 reg, bs_size_2d;
+
+ DRM_DEBUG("w: %u, h: %u\n", vm.hactive, vm.vactive);
+ bs_size_2d = ((vm.hactive >> 2) << 1) + (vm.vactive % 4);
+ reg = MIC_BS_SIZE_2D(bs_size_2d);
+ writel(reg, mic->reg + MIC_2D_OUTPUT_TIMING_2);
+
+ if (!mic->i80_mode) {
+ reg = MIC_H_PULSE_WIDTH_2D(vm.hsync_len) +
+ MIC_H_PERIOD_PIXEL_2D(vm.hsync_len + bs_size_2d +
+ vm.hback_porch + vm.hfront_porch);
+ writel(reg, mic->reg + MIC_2D_OUTPUT_TIMING_0);
+
+ reg = MIC_HBP_SIZE_2D(vm.hback_porch) +
+ MIC_H_PERIOD_PIXEL_2D(vm.hfront_porch);
+ writel(reg, mic->reg + MIC_2D_OUTPUT_TIMING_1);
+ }
+}
+
+static void mic_set_reg_on(struct exynos_mic *mic, bool enable)
+{
+ u32 reg = readl(mic->reg + MIC_OP);
+
+ if (enable) {
+ reg &= ~(MIC_MODE_SEL_MASK | MIC_CORE_VER_CONTROL | MIC_PSR_EN);
+ reg |= (MIC_CORE_EN | MIC_BS_CHG_OUT | MIC_ON_REG);
+
+ reg &= ~MIC_MODE_SEL_COMMAND_MODE;
+ if (mic->i80_mode)
+ reg |= MIC_MODE_SEL_COMMAND_MODE;
+ } else {
+ reg &= ~MIC_CORE_EN;
+ }
+
+ reg |= MIC_UPD_REG;
+ writel(reg, mic->reg + MIC_OP);
+}
+
+static struct device_node *get_remote_node(struct device_node *from, int reg)
+{
+ struct device_node *endpoint = NULL, *remote_node = NULL;
+
+ endpoint = of_graph_get_endpoint_by_regs(from, reg, -1);
+ if (!endpoint) {
+ DRM_ERROR("mic: Failed to find remote port from %s",
+ from->full_name);
+ goto exit;
+ }
+
+ remote_node = of_graph_get_remote_port_parent(endpoint);
+ if (!remote_node) {
+ DRM_ERROR("mic: Failed to find remote port parent from %s",
+ from->full_name);
+ goto exit;
+ }
+
+exit:
+ of_node_put(endpoint);
+ return remote_node;
+}
+
+static int parse_dt(struct exynos_mic *mic)
+{
+ int ret = 0, i, j;
+ struct device_node *remote_node;
+ struct device_node *nodes[3];
+
+ /*
+ * The order of endpoints does matter.
+ * The first node must be for decon and the second one must be for dsi.
+ */
+ for (i = 0, j = 0; i < NUM_ENDPOINTS; i++) {
+ remote_node = get_remote_node(mic->dev->of_node, i);
+ if (!remote_node) {
+ ret = -EPIPE;
+ goto exit;
+ }
+ nodes[j++] = remote_node;
+
+ switch (i) {
+ case ENDPOINT_DECON_NODE:
+ /* decon node */
+ if (of_get_child_by_name(remote_node,
+ "i80-if-timings"))
+ mic->i80_mode = 1;
+
+ break;
+ case ENDPOINT_DSI_NODE:
+ /* panel node */
+ remote_node = get_remote_node(remote_node, 1);
+ if (!remote_node) {
+ ret = -EPIPE;
+ goto exit;
+ }
+ nodes[j++] = remote_node;
+
+ ret = of_get_videomode(remote_node,
+ &mic->vm, 0);
+ if (ret) {
+ DRM_ERROR("mic: failed to get videomode");
+ goto exit;
+ }
+
+ break;
+ default:
+ DRM_ERROR("mic: Unknown endpoint from MIC");
+ break;
+ }
+ }
+
+exit:
+ while (--j > -1)
+ of_node_put(nodes[j]);
+
+ return ret;
+}
+
+void mic_disable(struct drm_bridge *bridge) { }
+
+void mic_post_disable(struct drm_bridge *bridge)
+{
+ struct exynos_mic *mic = bridge->driver_private;
+ int i;
+
+ mutex_lock(&mic_mutex);
+ if (!mic->enabled)
+ goto already_disabled;
+
+ mic_set_path(mic, 0);
+
+ for (i = NUM_CLKS - 1; i > -1; i--)
+ clk_disable_unprepare(mic->clks[i]);
+
+ mic->enabled = 0;
+
+already_disabled:
+ mutex_unlock(&mic_mutex);
+}
+
+void mic_pre_enable(struct drm_bridge *bridge)
+{
+ struct exynos_mic *mic = bridge->driver_private;
+ int ret, i;
+
+ mutex_lock(&mic_mutex);
+ if (mic->enabled)
+ goto already_enabled;
+
+ for (i = 0; i < NUM_CLKS; i++) {
+ ret = clk_prepare_enable(mic->clks[i]);
+ if (ret < 0) {
+ DRM_ERROR("Failed to enable clock (%s)\n",
+ clk_names[i]);
+ goto turn_off_clks;
+ }
+ }
+
+ mic_set_path(mic, 1);
+
+ ret = mic_sw_reset(mic);
+ if (ret) {
+ DRM_ERROR("Failed to reset\n");
+ goto turn_off_clks;
+ }
+
+ if (!mic->i80_mode)
+ mic_set_porch_timing(mic);
+ mic_set_img_size(mic);
+ mic_set_output_timing(mic);
+ mic_set_reg_on(mic, 1);
+ mic->enabled = 1;
+ mutex_unlock(&mic_mutex);
+
+ return;
+
+turn_off_clks:
+ while (--i > -1)
+ clk_disable_unprepare(mic->clks[i]);
+already_enabled:
+ mutex_unlock(&mic_mutex);
+}
+
+void mic_enable(struct drm_bridge *bridge) { }
+
+void mic_destroy(struct drm_bridge *bridge)
+{
+ struct exynos_mic *mic = bridge->driver_private;
+ int i;
+
+ mutex_lock(&mic_mutex);
+ if (!mic->enabled)
+ goto already_disabled;
+
+ for (i = NUM_CLKS - 1; i > -1; i--)
+ clk_disable_unprepare(mic->clks[i]);
+
+already_disabled:
+ mutex_unlock(&mic_mutex);
+}
+
+struct drm_bridge_funcs mic_bridge_funcs = {
+ .disable = mic_disable,
+ .post_disable = mic_post_disable,
+ .pre_enable = mic_pre_enable,
+ .enable = mic_enable,
+};
+
+int exynos_mic_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct exynos_mic *mic;
+ struct resource res;
+ int ret, i;
+
+ mic = devm_kzalloc(dev, sizeof(*mic), GFP_KERNEL);
+ if (!mic) {
+ DRM_ERROR("mic: Failed to allocate memory for MIC object\n");
+ ret = -ENOMEM;
+ goto err;
+ }
+
+ mic->dev = dev;
+
+ ret = parse_dt(mic);
+ if (ret)
+ goto err;
+
+ ret = of_address_to_resource(dev->of_node, 0, &res);
+ if (ret) {
+ DRM_ERROR("mic: Failed to get mem region for MIC\n");
+ goto err;
+ }
+ mic->reg = devm_ioremap(dev, res.start, resource_size(&res));
+ if (!mic->reg) {
+ DRM_ERROR("mic: Failed to remap for MIC\n");
+ ret = -ENOMEM;
+ goto err;
+ }
+
+ mic->sysreg = syscon_regmap_lookup_by_phandle(dev->of_node,
+ "samsung,disp-syscon");
+ if (IS_ERR(mic->sysreg)) {
+ DRM_ERROR("mic: Failed to get system register.\n");
+ goto err;
+ }
+
+ mic->bridge.funcs = &mic_bridge_funcs;
+ mic->bridge.of_node = dev->of_node;
+ mic->bridge.driver_private = mic;
+ ret = drm_bridge_add(&mic->bridge);
+ if (ret) {
+ DRM_ERROR("mic: Failed to add MIC to the global bridge list\n");
+ goto err;
+ }
+
+ for (i = 0; i < NUM_CLKS; i++) {
+ mic->clks[i] = of_clk_get_by_name(dev->of_node, clk_names[i]);
+ if (IS_ERR(mic->clks[i])) {
+ DRM_ERROR("mic: Failed to get clock (%s)\n",
+ clk_names[i]);
+ ret = PTR_ERR(mic->clks[i]);
+ goto err;
+ }
+ }
+
+ DRM_DEBUG_KMS("MIC has been probed\n");
+
+err:
+ return ret;
+}
+
+static int exynos_mic_remove(struct platform_device *pdev)
+{
+ struct exynos_mic *mic = platform_get_drvdata(pdev);
+ int i;
+
+ drm_bridge_remove(&mic->bridge);
+
+ for (i = NUM_CLKS - 1; i > -1; i--)
+ clk_put(mic->clks[i]);
+
+ return 0;
+}
+
+static const struct of_device_id exynos_mic_of_match[] = {
+ { .compatible = "samsung,exynos5433-mic" },
+ { }
+};
+MODULE_DEVICE_TABLE(of, exynos_mic_of_match);
+
+struct platform_driver mic_driver = {
+ .probe = exynos_mic_probe,
+ .remove = exynos_mic_remove,
+ .driver = {
+ .name = "exynos-mic",
+ .owner = THIS_MODULE,
+ .of_match_table = exynos_mic_of_match,
+ },
+};
--
1.9.1
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