1 files changed, 342 insertions, 70 deletions

diff --git a/drivers/bus/imx-weim.c b/drivers/bus/imx-weim.c
index 349f14e886b7..83d623d97f5f 100644
--- a/drivers/bus/imx-weim.c
+++ b/drivers/bus/imx-weim.c
@@ -10,129 +10,401 @@
 #include <linux/module.h>
 #include <linux/clk.h>
 #include <linux/io.h>
-#include <linux/of_device.h>
+#include <linux/of_address.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
+#include <linux/property.h>
+#include <linux/mfd/syscon.h>
+#include <linux/mfd/syscon/imx6q-iomuxc-gpr.h>
+#include <linux/regmap.h>
 
-struct imx_weim {
+struct imx_weim_devtype {
+	unsigned int	cs_count;
+	unsigned int	cs_regs_count;
+	unsigned int	cs_stride;
+	unsigned int	wcr_offset;
+	unsigned int	wcr_bcm;
+	unsigned int	wcr_cont_bclk;
+};
+
+static const struct imx_weim_devtype imx1_weim_devtype = {
+	.cs_count	= 6,
+	.cs_regs_count	= 2,
+	.cs_stride	= 0x08,
+};
+
+static const struct imx_weim_devtype imx27_weim_devtype = {
+	.cs_count	= 6,
+	.cs_regs_count	= 3,
+	.cs_stride	= 0x10,
+};
+
+static const struct imx_weim_devtype imx50_weim_devtype = {
+	.cs_count	= 4,
+	.cs_regs_count	= 6,
+	.cs_stride	= 0x18,
+	.wcr_offset	= 0x90,
+	.wcr_bcm	= BIT(0),
+	.wcr_cont_bclk	= BIT(3),
+};
+
+static const struct imx_weim_devtype imx51_weim_devtype = {
+	.cs_count	= 6,
+	.cs_regs_count	= 6,
+	.cs_stride	= 0x18,
+};
+
+#define MAX_CS_REGS_COUNT	6
+#define MAX_CS_COUNT		6
+#define OF_REG_SIZE		3
+
+struct cs_timing {
+	bool is_applied;
+	u32 regs[MAX_CS_REGS_COUNT];
+};
+
+struct cs_timing_state {
+	struct cs_timing cs[MAX_CS_COUNT];
+};
+
+struct weim_priv {
 	void __iomem *base;
-	struct clk *clk;
+	struct cs_timing_state timing_state;
 };
 
 static const struct of_device_id weim_id_table[] = {
-	{ .compatible = "fsl,imx6q-weim", },
-	{}
+	/* i.MX1/21 */
+	{ .compatible = "fsl,imx1-weim", .data = &imx1_weim_devtype, },
+	/* i.MX25/27/31/35 */
+	{ .compatible = "fsl,imx27-weim", .data = &imx27_weim_devtype, },
+	/* i.MX50/53/6Q */
+	{ .compatible = "fsl,imx50-weim", .data = &imx50_weim_devtype, },
+	{ .compatible = "fsl,imx6q-weim", .data = &imx50_weim_devtype, },
+	/* i.MX51 */
+	{ .compatible = "fsl,imx51-weim", .data = &imx51_weim_devtype, },
+	{ }
 };
 MODULE_DEVICE_TABLE(of, weim_id_table);
 
-#define CS_TIMING_LEN 6
-#define CS_REG_RANGE  0x18
+static int imx_weim_gpr_setup(struct platform_device *pdev)
+{
+	struct device_node *np = pdev->dev.of_node;
+	struct of_range_parser parser;
+	struct of_range range;
+	struct regmap *gpr;
+	u32 gprvals[4] = {
+		05,	/* CS0(128M) CS1(0M)  CS2(0M)  CS3(0M)  */
+		033,	/* CS0(64M)  CS1(64M) CS2(0M)  CS3(0M)  */
+		0113,	/* CS0(64M)  CS1(32M) CS2(32M) CS3(0M)  */
+		01111,	/* CS0(32M)  CS1(32M) CS2(32M) CS3(32M) */
+	};
+	u32 gprval = 0;
+	u32 val;
+	int cs = 0;
+	int i = 0;
+
+	gpr = syscon_regmap_lookup_by_phandle(np, "fsl,weim-cs-gpr");
+	if (IS_ERR(gpr)) {
+		dev_dbg(&pdev->dev, "failed to find weim-cs-gpr\n");
+		return 0;
+	}
+
+	if (of_range_parser_init(&parser, np))
+		goto err;
+
+	for_each_of_range(&parser, &range) {
+		cs = range.bus_addr >> 32;
+		val = (range.size / SZ_32M) | 1;
+		gprval |= val << cs * 3;
+		i++;
+	}
+
+	if (i == 0)
+		goto err;
+
+	for (i = 0; i < ARRAY_SIZE(gprvals); i++) {
+		if (gprval == gprvals[i]) {
+			/* Found it. Set up IOMUXC_GPR1[11:0] with it. */
+			regmap_update_bits(gpr, IOMUXC_GPR1, 0xfff, gprval);
+			return 0;
+		}
+	}
+
+err:
+	dev_err(&pdev->dev, "Invalid 'ranges' configuration\n");
+	return -EINVAL;
+}
 
 /* Parse and set the timing for this device. */
-static int
-weim_timing_setup(struct platform_device *pdev, struct device_node *np)
+static int weim_timing_setup(struct device *dev, struct device_node *np,
+			     const struct imx_weim_devtype *devtype)
 {
-	struct imx_weim *weim = platform_get_drvdata(pdev);
-	u32 value[CS_TIMING_LEN];
-	u32 cs_idx;
-	int ret;
-	int i;
-
-	/* get the CS index from this child node's "reg" property. */
-	ret = of_property_read_u32(np, "reg", &cs_idx);
-	if (ret)
-		return ret;
+	u32 cs_idx, value[MAX_CS_REGS_COUNT];
+	int i, ret;
+	int reg_idx, num_regs;
+	struct cs_timing *cst;
+	struct weim_priv *priv;
+	struct cs_timing_state *ts;
+	void __iomem *base;
 
-	/* The weim has four chip selects. */
-	if (cs_idx > 3)
+	if (WARN_ON(devtype->cs_regs_count > MAX_CS_REGS_COUNT))
 		return -EINVAL;
+	if (WARN_ON(devtype->cs_count > MAX_CS_COUNT))
+		return -EINVAL;
+
+	priv = dev_get_drvdata(dev);
+	base = priv->base;
+	ts = &priv->timing_state;
 
 	ret = of_property_read_u32_array(np, "fsl,weim-cs-timing",
-					value, CS_TIMING_LEN);
+					 value, devtype->cs_regs_count);
 	if (ret)
 		return ret;
 
-	/* set the timing for WEIM */
-	for (i = 0; i < CS_TIMING_LEN; i++)
-		writel(value[i], weim->base + cs_idx * CS_REG_RANGE + i * 4);
+	/*
+	 * the child node's "reg" property may contain multiple address ranges,
+	 * extract the chip select for each.
+	 */
+	num_regs = of_property_count_elems_of_size(np, "reg", OF_REG_SIZE);
+	if (num_regs < 0)
+		return num_regs;
+	if (!num_regs)
+		return -EINVAL;
+	for (reg_idx = 0; reg_idx < num_regs; reg_idx++) {
+		/* get the CS index from this child node's "reg" property. */
+		ret = of_property_read_u32_index(np, "reg",
+					reg_idx * OF_REG_SIZE, &cs_idx);
+		if (ret)
+			break;
+
+		if (cs_idx >= devtype->cs_count)
+			return -EINVAL;
+
+		/* prevent re-configuring a CS that's already been configured */
+		cst = &ts->cs[cs_idx];
+		if (cst->is_applied && memcmp(value, cst->regs,
+					devtype->cs_regs_count * sizeof(u32))) {
+			dev_err(dev, "fsl,weim-cs-timing conflict on %pOF", np);
+			return -EINVAL;
+		}
+
+		/* set the timing for WEIM */
+		for (i = 0; i < devtype->cs_regs_count; i++)
+			writel(value[i],
+				base + cs_idx * devtype->cs_stride + i * 4);
+		if (!cst->is_applied) {
+			cst->is_applied = true;
+			memcpy(cst->regs, value,
+				devtype->cs_regs_count * sizeof(u32));
+		}
+	}
+
 	return 0;
 }
 
 static int weim_parse_dt(struct platform_device *pdev)
 {
+	const struct imx_weim_devtype *devtype = device_get_match_data(&pdev->dev);
+	int ret = 0, have_child = 0;
 	struct device_node *child;
-	int ret;
-
-	for_each_child_of_node(pdev->dev.of_node, child) {
-		if (!child->name)
-			continue;
+	struct weim_priv *priv;
+	void __iomem *base;
+	u32 reg;
 
-		ret = weim_timing_setup(pdev, child);
-		if (ret) {
-			dev_err(&pdev->dev, "%s set timing failed.\n",
-				child->full_name);
+	if (devtype == &imx50_weim_devtype) {
+		ret = imx_weim_gpr_setup(pdev);
+		if (ret)
 			return ret;
+	}
+
+	priv = dev_get_drvdata(&pdev->dev);
+	base = priv->base;
+
+	if (of_property_read_bool(pdev->dev.of_node, "fsl,burst-clk-enable")) {
+		if (devtype->wcr_bcm) {
+			reg = readl(base + devtype->wcr_offset);
+			reg |= devtype->wcr_bcm;
+
+			if (of_property_read_bool(pdev->dev.of_node,
+						"fsl,continuous-burst-clk")) {
+				if (devtype->wcr_cont_bclk) {
+					reg |= devtype->wcr_cont_bclk;
+				} else {
+					dev_err(&pdev->dev,
+						"continuous burst clk not supported.\n");
+					return -EINVAL;
+				}
+			}
+
+			writel(reg, base + devtype->wcr_offset);
+		} else {
+			dev_err(&pdev->dev, "burst clk mode not supported.\n");
+			return -EINVAL;
 		}
 	}
 
-	ret = of_platform_populate(pdev->dev.of_node, NULL, NULL, &pdev->dev);
+	for_each_available_child_of_node(pdev->dev.of_node, child) {
+		ret = weim_timing_setup(&pdev->dev, child, devtype);
+		if (ret)
+			dev_warn(&pdev->dev, "%pOF set timing failed.\n",
+				child);
+		else
+			have_child = 1;
+	}
+
+	if (have_child)
+		ret = of_platform_default_populate(pdev->dev.of_node,
+						   NULL, &pdev->dev);
 	if (ret)
-		dev_err(&pdev->dev, "%s fail to create devices.\n",
-			pdev->dev.of_node->full_name);
+		dev_err(&pdev->dev, "%pOF fail to create devices.\n",
+			pdev->dev.of_node);
 	return ret;
 }
 
 static int weim_probe(struct platform_device *pdev)
 {
-	struct imx_weim *weim;
-	struct resource *res;
-	int ret = -EINVAL;
-
-	weim = devm_kzalloc(&pdev->dev, sizeof(*weim), GFP_KERNEL);
-	if (!weim) {
-		ret = -ENOMEM;
-		goto weim_err;
-	}
-	platform_set_drvdata(pdev, weim);
+	struct weim_priv *priv;
+	struct clk *clk;
+	void __iomem *base;
+	int ret;
+
+	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
 
 	/* get the resource */
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	weim->base = devm_ioremap_resource(&pdev->dev, res);
-	if (IS_ERR(weim->base)) {
-		ret = PTR_ERR(weim->base);
-		goto weim_err;
-	}
+	base = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(base))
+		return PTR_ERR(base);
 
-	/* get the clock */
-	weim->clk = devm_clk_get(&pdev->dev, NULL);
-	if (IS_ERR(weim->clk))
-		goto weim_err;
+	priv->base = base;
+	dev_set_drvdata(&pdev->dev, priv);
 
-	ret = clk_prepare_enable(weim->clk);
-	if (ret)
-		goto weim_err;
+	/* get the clock */
+	clk = devm_clk_get_enabled(&pdev->dev, NULL);
+	if (IS_ERR(clk))
+		return PTR_ERR(clk);
 
 	/* parse the device node */
 	ret = weim_parse_dt(pdev);
-	if (ret) {
-		clk_disable_unprepare(weim->clk);
-		goto weim_err;
-	}
+	if (ret)
+		return ret;
+
+	dev_info(&pdev->dev, "Driver registered.\n");
 
-	dev_info(&pdev->dev, "WEIM driver registered.\n");
 	return 0;
+}
+
+#if IS_ENABLED(CONFIG_OF_DYNAMIC)
+static int of_weim_notify(struct notifier_block *nb, unsigned long action,
+			  void *arg)
+{
+	const struct imx_weim_devtype *devtype;
+	struct of_reconfig_data *rd = arg;
+	const struct of_device_id *of_id;
+	struct platform_device *pdev;
+	int ret = NOTIFY_OK;
+
+	switch (of_reconfig_get_state_change(action, rd)) {
+	case OF_RECONFIG_CHANGE_ADD:
+		of_id = of_match_node(weim_id_table, rd->dn->parent);
+		if (!of_id)
+			return NOTIFY_OK; /* not for us */
+
+		devtype = of_id->data;
+
+		pdev = of_find_device_by_node(rd->dn->parent);
+		if (!pdev) {
+			pr_err("%s: could not find platform device for '%pOF'\n",
+				__func__, rd->dn->parent);
+
+			return notifier_from_errno(-EINVAL);
+		}
+
+		if (weim_timing_setup(&pdev->dev, rd->dn, devtype))
+			dev_warn(&pdev->dev,
+				 "Failed to setup timing for '%pOF'\n", rd->dn);
+
+		if (!of_node_check_flag(rd->dn, OF_POPULATED)) {
+			/*
+			 * Clear the flag before adding the device so that
+			 * fw_devlink doesn't skip adding consumers to this
+			 * device.
+			 */
+			rd->dn->fwnode.flags &= ~FWNODE_FLAG_NOT_DEVICE;
+			if (!of_platform_device_create(rd->dn, NULL, &pdev->dev)) {
+				dev_err(&pdev->dev,
+					"Failed to create child device '%pOF'\n",
+					rd->dn);
+				ret = notifier_from_errno(-EINVAL);
+			}
+		}
+
+		platform_device_put(pdev);
+
+		break;
+	case OF_RECONFIG_CHANGE_REMOVE:
+		if (!of_node_check_flag(rd->dn, OF_POPULATED))
+			return NOTIFY_OK; /* device already destroyed */
+
+		of_id = of_match_node(weim_id_table, rd->dn->parent);
+		if (!of_id)
+			return NOTIFY_OK; /* not for us */
+
+		pdev = of_find_device_by_node(rd->dn);
+		if (!pdev) {
+			pr_err("Could not find platform device for '%pOF'\n",
+				rd->dn);
+
+			ret = notifier_from_errno(-EINVAL);
+		} else {
+			of_platform_device_destroy(&pdev->dev, NULL);
+			platform_device_put(pdev);
+		}
+
+		break;
+	default:
+		break;
+	}
 
-weim_err:
 	return ret;
 }
 
+static struct notifier_block weim_of_notifier = {
+	.notifier_call = of_weim_notify,
+};
+#endif /* IS_ENABLED(CONFIG_OF_DYNAMIC) */
+
 static struct platform_driver weim_driver = {
 	.driver = {
-		.name = "imx-weim",
-		.of_match_table = weim_id_table,
+		.name		= "imx-weim",
+		.of_match_table	= weim_id_table,
 	},
-	.probe   = weim_probe,
+	.probe = weim_probe,
 };
 
-module_platform_driver(weim_driver);
+static int __init weim_init(void)
+{
+#if IS_ENABLED(CONFIG_OF_DYNAMIC)
+	WARN_ON(of_reconfig_notifier_register(&weim_of_notifier));
+#endif /* IS_ENABLED(CONFIG_OF_DYNAMIC) */
+
+	return platform_driver_register(&weim_driver);
+}
+module_init(weim_init);
+
+static void __exit weim_exit(void)
+{
+#if IS_ENABLED(CONFIG_OF_DYNAMIC)
+	of_reconfig_notifier_unregister(&weim_of_notifier);
+#endif /* IS_ENABLED(CONFIG_OF_DYNAMIC) */
+
+	return platform_driver_unregister(&weim_driver);
+
+}
+module_exit(weim_exit);
+
 MODULE_AUTHOR("Freescale Semiconductor Inc.");
 MODULE_DESCRIPTION("i.MX EIM Controller Driver");
 MODULE_LICENSE("GPL");