path: root/recipes-kernel/most/files/0007-dim2-use-device-tree.patch

From 8e16207392cd715ea88f6780981a3d55ab005588 Mon Sep 17 00:00:00 2001
From: Andrey Shvetsov <andrey.shvetsov@k2l.de>
Date: Mon, 12 Feb 2018 12:23:37 +0100
Subject: [PATCH] staging: most: dim2: use device tree

Current dim2 driver expects the existence of a platform driver that
implements the platform specific initialization and delivery of the irq
numbers.

This patch integrates the device tree activity and platform specific
code into the driver.

Signed-off-by: Andrey Shvetsov <andrey.shvetsov@k2l.de>
---
 hdm-dim2/dim2_hdm.c                 | 222 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-----------------------------
 hdm-dim2/dim2_hdm.h                 |  28 ----------------------------
 hdm-dim2/platform/dim2_arwen_mlb3.c | 165 ---------------------------------------------------------------------------------------------------------------------------------------------------------------------
 hdm-dim2/platform/dim2_arwen_mlb6.c | 169 -------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 hdm-dim2/platform/dim2_h2_dt.c      | 227 -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 hdm-dim2/platform/dim2_mx6q.c       | 192 ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 hdm-dim2/platform/dim2_mx6q_dt.c    | 224 --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 7 files changed, 193 insertions(+), 1034 deletions(-)
 delete mode 100644 hdm-dim2/dim2_hdm.h
 delete mode 100644 hdm-dim2/platform/dim2_arwen_mlb3.c
 delete mode 100644 hdm-dim2/platform/dim2_arwen_mlb6.c
 delete mode 100644 hdm-dim2/platform/dim2_h2_dt.c
 delete mode 100644 hdm-dim2/platform/dim2_mx6q.c
 delete mode 100644 hdm-dim2/platform/dim2_mx6q_dt.c

diff --git a/hdm-dim2/dim2_hdm.c b/hdm-dim2/dim2_hdm.c
index e4629a5..2dba917 100644
--- a/hdm-dim2/dim2_hdm.c
+++ b/hdm-dim2/dim2_hdm.c
@@ -14,6 +14,7 @@
 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

 #include <linux/module.h>
+#include <linux/of_platform.h>
 #include <linux/printk.h>
 #include <linux/kernel.h>
 #include <linux/init.h>
@@ -21,13 +22,13 @@
 #include <linux/interrupt.h>
 #include <linux/slab.h>
 #include <linux/io.h>
+#include <linux/clk.h>
 #include <linux/dma-mapping.h>
 #include <linux/sched.h>
 #include <linux/kthread.h>

 #include <mostcore.h>
 #include "dim2_hal.h"
-#include "dim2_hdm.h"
 #include "dim2_errors.h"
 #include "dim2_sysfs.h"

@@ -93,6 +94,9 @@ struct dim2_hdm {
	struct most_interface most_iface;
	char name[16 + sizeof "dim2-"];
	void __iomem *io_base;
+	u8 clk_speed;
+	struct clk *clk;
+	struct clk *clk_pll;
	struct task_struct *netinfo_task;
	wait_queue_head_t netinfo_waitq;
	int deliver_netinfo;
@@ -102,6 +106,12 @@ struct dim2_hdm {
	struct medialb_bus bus;
	void (*on_netinfo)(struct most_interface *,
			   unsigned char, unsigned char *);
+	void (*disable_platform)(struct platform_device *);
+};
+
+struct dim2_platform_data {
+	int (*enable)(struct platform_device *);
+	void (*disable)(struct platform_device *);
 };

 #define iface_to_hdm(iface) container_of(iface, struct dim2_hdm, most_iface)
@@ -686,6 +696,8 @@ static void dma_free(struct mbo *mbo, u32 size)
	dma_free_coherent(NULL, size, mbo->virt_address, mbo->bus_address);
 }

+static const struct of_device_id dim2_of_match[];
+
 /*
  * dim2_probe - dim2 probe handler
  * @pdev: platform device structure
@@ -695,7 +707,7 @@ static void dma_free(struct mbo *mbo, u32 size)
  */
 static int dim2_probe(struct platform_device *pdev)
 {
-	struct dim2_platform_data *pdata = pdev->dev.platform_data;
+	const struct dim2_platform_data *pdata;
	struct dim2_hdm *dev;
	struct resource *res;
	int ret, i;
@@ -703,6 +715,8 @@ static int dim2_probe(struct platform_device *pdev)
	u8 hal_ret;
	int irq;

+	enum { MLB_INT_IDX, AHB0_INT_IDX };
+
	dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
	if (!dev)
		return -ENOMEM;
@@ -710,29 +724,30 @@ static int dim2_probe(struct platform_device *pdev)
	dev->atx_idx = -1;

	platform_set_drvdata(pdev, dev);
+
+	dev->clk_speed = CLK_4096FS;
+
	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	dev->io_base = devm_ioremap_resource(&pdev->dev, res);
	if (IS_ERR(dev->io_base))
		return PTR_ERR(dev->io_base);

-	if (!pdata) {
-		dev_err(&pdev->dev, "missing platform data\n");
-		return -EINVAL;
-	}
-
-	ret = pdata->init ? pdata->init(pdata, dev->io_base) : 0;
+	pdata = of_match_node(dim2_of_match, pdev->dev.of_node)->data;
+	ret = pdata && pdata->enable ? pdata->enable(pdev) : 0;
	if (ret)
		return ret;

+	dev->disable_platform = pdata ? pdata->disable : 0;
+
	dev_info(&pdev->dev, "sync: num of frames per sub-buffer: %u\n", fcnt);
-	hal_ret = dim_startup(dev->io_base, pdata->clk_speed, fcnt);
+	hal_ret = dim_startup(dev->io_base, dev->clk_speed, fcnt);
	if (hal_ret != DIM_NO_ERROR) {
		dev_err(&pdev->dev, "dim_startup failed: %d\n", hal_ret);
		ret = -ENODEV;
-		goto err_bsp_destroy;
+		goto err_disable_platform;
	}

-	irq = platform_get_irq(pdev, 0);
+	irq = platform_get_irq(pdev, AHB0_INT_IDX);
	if (irq < 0) {
		dev_err(&pdev->dev, "failed to get ahb0_int irq: %d\n", irq);
		ret = irq;
@@ -746,7 +761,7 @@ static int dim2_probe(struct platform_device *pdev)
		goto err_shutdown_dim;
	}

-	irq = platform_get_irq(pdev, 1);
+	irq = platform_get_irq(pdev, MLB_INT_IDX);
	if (irq < 0) {
		dev_err(&pdev->dev, "failed to get mlb_int irq: %d\n", irq);
		ret = irq;
@@ -832,9 +847,9 @@ static int dim2_probe(struct platform_device *pdev)
	kthread_stop(dev->netinfo_task);
 err_shutdown_dim:
	dim_shutdown();
-err_bsp_destroy:
-	if (pdata && pdata->destroy)
-		pdata->destroy(pdata);
+err_disable_platform:
+	if (dev->disable_platform)
+		dev->disable_platform(pdev);

	return ret;
 }
@@ -848,7 +863,6 @@ static int dim2_probe(struct platform_device *pdev)
 static int dim2_remove(struct platform_device *pdev)
 {
	struct dim2_hdm *dev = platform_get_drvdata(pdev);
-	struct dim2_platform_data *pdata = pdev->dev.platform_data;
	unsigned long flags;

	dim2_sysfs_destroy(&dev->bus);
@@ -859,37 +873,187 @@ static int dim2_remove(struct platform_device *pdev)
	dim_shutdown();
	spin_unlock_irqrestore(&dim_lock, flags);

-	if (pdata && pdata->destroy)
-		pdata->destroy(pdata);
+	if (dev->disable_platform)
+		dev->disable_platform(pdev);
+
+	return 0;
+}
+
+/* platform specific functions [[ */
+
+static int fsl_mx6_enable(struct platform_device *pdev)
+{
+	struct dim2_hdm *dev = platform_get_drvdata(pdev);
+	int ret;
+
+	dev->clk = devm_clk_get(&pdev->dev, "mlb");
+	if (IS_ERR_OR_NULL(dev->clk)) {
+		dev_err(&pdev->dev, "unable to get mlb clock\n");
+		return -EFAULT;
+	}
+
+	ret = clk_prepare_enable(dev->clk);
+	if (ret) {
+		dev_err(&pdev->dev, "%s\n", "clk_prepare_enable failed");
+		return ret;
+	}
+
+	if (dev->clk_speed >= CLK_2048FS) {
+		/* enable pll */
+		dev->clk_pll = devm_clk_get(&pdev->dev, "pll8_mlb");
+		if (IS_ERR_OR_NULL(dev->clk_pll)) {
+			dev_err(&pdev->dev, "unable to get mlb pll clock\n");
+			clk_disable_unprepare(dev->clk);
+			return -EFAULT;
+		}
+
+		writel(0x888, dev->io_base + 0x38);
+		clk_prepare_enable(dev->clk_pll);
+	}
+
+	return 0;
+}
+
+static void fsl_mx6_disable(struct platform_device *pdev)
+{
+	struct dim2_hdm *dev = platform_get_drvdata(pdev);
+
+	if (dev->clk_speed >= CLK_2048FS)
+		clk_disable_unprepare(dev->clk_pll);
+
+	clk_disable_unprepare(dev->clk);
+}
+
+static int rcar_h2_enable(struct platform_device *pdev)
+{
+	struct dim2_hdm *dev = platform_get_drvdata(pdev);
+	int ret;
+
+	dev->clk = devm_clk_get(&pdev->dev, NULL);
+	if (IS_ERR(dev->clk)) {
+		dev_err(&pdev->dev, "cannot get clock\n");
+		return PTR_ERR(dev->clk);
+	}
+
+	ret = clk_prepare_enable(dev->clk);
+	if (ret) {
+		dev_err(&pdev->dev, "%s\n", "clk_prepare_enable failed");
+		return ret;
+	}
+
+	if (dev->clk_speed >= CLK_2048FS) {
+		/* enable MLP pll and LVDS drivers */
+		writel(0x03, dev->io_base + 0x600);
+		/* set bias */
+		writel(0x888, dev->io_base + 0x38);
+	} else {
+		/* PLL */
+		writel(0x04, dev->io_base + 0x600);
+	}
+

-	/*
-	 * break link to local platform_device_id struct
-	 * to prevent crash by unload platform device module
-	 */
-	pdev->id_entry = NULL;
+	/* BBCR = 0b11 */
+	writel(0x03, dev->io_base + 0x500);
+	writel(0x0002FF02, dev->io_base + 0x508);

	return 0;
 }

-static const struct platform_device_id dim2_id[] = {
-	{ "medialb_dim2" },
-	{ }, /* Terminating entry */
+static void rcar_h2_disable(struct platform_device *pdev)
+{
+	struct dim2_hdm *dev = platform_get_drvdata(pdev);
+
+	clk_disable_unprepare(dev->clk);
+
+	/* disable PLLs and LVDS drivers */
+	writel(0x0, dev->io_base + 0x600);
+}
+
+static int rcar_m3_enable(struct platform_device *pdev)
+{
+	struct dim2_hdm *dev = platform_get_drvdata(pdev);
+	u32 enable_512fs = dev->clk_speed == CLK_512FS;
+	int ret;
+
+	dev->clk = devm_clk_get(&pdev->dev, NULL);
+	if (IS_ERR(dev->clk)) {
+		dev_err(&pdev->dev, "cannot get clock\n");
+		return PTR_ERR(dev->clk);
+	}
+
+	ret = clk_prepare_enable(dev->clk);
+	if (ret) {
+		dev_err(&pdev->dev, "%s\n", "clk_prepare_enable failed");
+		return ret;
+	}
+
+	/* PLL */
+	writel(0x04, dev->io_base + 0x600);
+
+	writel(enable_512fs, dev->io_base + 0x604);
+
+	/* BBCR = 0b11 */
+	writel(0x03, dev->io_base + 0x500);
+	writel(0x0002FF02, dev->io_base + 0x508);
+
+	return 0;
+}
+
+static void rcar_m3_disable(struct platform_device *pdev)
+{
+	struct dim2_hdm *dev = platform_get_drvdata(pdev);
+
+	clk_disable_unprepare(dev->clk);
+
+	/* disable PLLs and LVDS drivers */
+	writel(0x0, dev->io_base + 0x600);
+}
+
+/* ]] platform specific functions */
+
+enum dim2_platforms { FSL_MX6, RCAR_H2, RCAR_M3 };
+
+static struct dim2_platform_data plat_data[] = {
+	[FSL_MX6] = { .enable = fsl_mx6_enable, .disable = fsl_mx6_disable },
+	[RCAR_H2] = { .enable = rcar_h2_enable, .disable = rcar_h2_disable },
+	[RCAR_M3] = { .enable = rcar_m3_enable, .disable = rcar_m3_disable },
+};
+
+static const struct of_device_id dim2_of_match[] = {
+	{
+		.compatible = "fsl,imx6q-mlb150",
+		.data = plat_data + FSL_MX6
+	},
+	{
+		.compatible = "renesas,mlp",
+		.data = plat_data + RCAR_H2
+	},
+	{
+		.compatible = "rcar,medialb-dim2",
+		.data = plat_data + RCAR_M3
+	},
+	{
+		.compatible = "xlnx,axi4-os62420_3pin-1.00.a",
+	},
+	{
+		.compatible = "xlnx,axi4-os62420_6pin-1.00.a",
+	},
+	{},
 };

-MODULE_DEVICE_TABLE(platform, dim2_id);
+MODULE_DEVICE_TABLE(of, dim2_of_match);

 static struct platform_driver dim2_driver = {
	.probe = dim2_probe,
	.remove = dim2_remove,
-	.id_table = dim2_id,
	.driver = {
		.name = "hdm_dim2",
+		.of_match_table = dim2_of_match,
	},
 };

 module_platform_driver(dim2_driver);

-MODULE_AUTHOR("Jain Roy Ambi <JainRoy.Ambi@microchip.com>");
 MODULE_AUTHOR("Andrey Shvetsov <andrey.shvetsov@k2l.de>");
 MODULE_DESCRIPTION("MediaLB DIM2 Hardware Dependent Module");
 MODULE_LICENSE("GPL");
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