--- /dev/null
+/*
+ * Copyright (C) 2015 Samsung Electronics Co.Ltd
+ * Authors:
+ * Hyungwon Hwang <human.hwang@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,
+ },
+};
projects / platform / kernel / linux-exynos.git / commitdiff