1 files changed, 164 insertions, 54 deletions

diff --git a/drivers/ata/libahci_platform.c b/drivers/ata/libahci_platform.c
index 32495ae96567..ddf17e2d266c 100644
--- a/drivers/ata/libahci_platform.c
+++ b/drivers/ata/libahci_platform.c
@@ -94,31 +94,41 @@ void ahci_platform_disable_phys(struct ahci_host_priv *hpriv)
 EXPORT_SYMBOL_GPL(ahci_platform_disable_phys);
 
 /**
- * ahci_platform_enable_clks - Enable platform clocks
+ * ahci_platform_find_clk - Find platform clock
  * @hpriv: host private area to store config values
+ * @con_id: clock connection ID
  *
- * This function enables all the clks found in hpriv->clks, starting at
- * index 0. If any clk fails to enable it disables all the clks already
- * enabled in reverse order, and then returns an error.
+ * This function returns a pointer to the clock descriptor of the clock with
+ * the passed ID.
  *
  * RETURNS:
- * 0 on success otherwise a negative error code
+ * Pointer to the clock descriptor on success otherwise NULL
  */
-int ahci_platform_enable_clks(struct ahci_host_priv *hpriv)
+struct clk *ahci_platform_find_clk(struct ahci_host_priv *hpriv, const char *con_id)
 {
-	int c, rc;
+	int i;
 
-	for (c = 0; c < AHCI_MAX_CLKS && hpriv->clks[c]; c++) {
-		rc = clk_prepare_enable(hpriv->clks[c]);
-		if (rc)
-			goto disable_unprepare_clk;
+	for (i = 0; i < hpriv->n_clks; i++) {
+		if (!strcmp(hpriv->clks[i].id, con_id))
+			return hpriv->clks[i].clk;
 	}
-	return 0;
 
-disable_unprepare_clk:
-	while (--c >= 0)
-		clk_disable_unprepare(hpriv->clks[c]);
-	return rc;
+	return NULL;
+}
+EXPORT_SYMBOL_GPL(ahci_platform_find_clk);
+
+/**
+ * ahci_platform_enable_clks - Enable platform clocks
+ * @hpriv: host private area to store config values
+ *
+ * This function enables all the clks found for the AHCI device.
+ *
+ * RETURNS:
+ * 0 on success otherwise a negative error code
+ */
+int ahci_platform_enable_clks(struct ahci_host_priv *hpriv)
+{
+	return clk_bulk_prepare_enable(hpriv->n_clks, hpriv->clks);
 }
 EXPORT_SYMBOL_GPL(ahci_platform_enable_clks);
 
@@ -126,20 +136,55 @@ EXPORT_SYMBOL_GPL(ahci_platform_enable_clks);
  * ahci_platform_disable_clks - Disable platform clocks
  * @hpriv: host private area to store config values
  *
- * This function disables all the clks found in hpriv->clks, in reverse
- * order of ahci_platform_enable_clks (starting at the end of the array).
+ * This function disables all the clocks enabled before
+ * (bulk-clocks-disable function is supposed to do that in reverse
+ * from the enabling procedure order).
  */
 void ahci_platform_disable_clks(struct ahci_host_priv *hpriv)
 {
-	int c;
-
-	for (c = AHCI_MAX_CLKS - 1; c >= 0; c--)
-		if (hpriv->clks[c])
-			clk_disable_unprepare(hpriv->clks[c]);
+	clk_bulk_disable_unprepare(hpriv->n_clks, hpriv->clks);
 }
 EXPORT_SYMBOL_GPL(ahci_platform_disable_clks);
 
 /**
+ * ahci_platform_deassert_rsts - Deassert/trigger platform resets
+ * @hpriv: host private area to store config values
+ *
+ * This function deasserts or triggers all the reset lines found for
+ * the AHCI device.
+ *
+ * RETURNS:
+ * 0 on success otherwise a negative error code
+ */
+int ahci_platform_deassert_rsts(struct ahci_host_priv *hpriv)
+{
+	if (hpriv->f_rsts & AHCI_PLATFORM_RST_TRIGGER)
+		return reset_control_reset(hpriv->rsts);
+
+	return reset_control_deassert(hpriv->rsts);
+}
+EXPORT_SYMBOL_GPL(ahci_platform_deassert_rsts);
+
+/**
+ * ahci_platform_assert_rsts - Assert/rearm platform resets
+ * @hpriv: host private area to store config values
+ *
+ * This function asserts or rearms (for self-deasserting resets) all
+ * the reset controls found for the AHCI device.
+ *
+ * RETURNS:
+ * 0 on success otherwise a negative error code
+ */
+int ahci_platform_assert_rsts(struct ahci_host_priv *hpriv)
+{
+	if (hpriv->f_rsts & AHCI_PLATFORM_RST_TRIGGER)
+		return reset_control_rearm(hpriv->rsts);
+
+	return reset_control_assert(hpriv->rsts);
+}
+EXPORT_SYMBOL_GPL(ahci_platform_assert_rsts);
+
+/**
  * ahci_platform_enable_regulators - Enable regulators
  * @hpriv: host private area to store config values
  *
@@ -236,18 +281,18 @@ int ahci_platform_enable_resources(struct ahci_host_priv *hpriv)
 	if (rc)
 		goto disable_regulator;
 
-	rc = reset_control_deassert(hpriv->rsts);
+	rc = ahci_platform_deassert_rsts(hpriv);
 	if (rc)
 		goto disable_clks;
 
 	rc = ahci_platform_enable_phys(hpriv);
 	if (rc)
-		goto disable_resets;
+		goto disable_rsts;
 
 	return 0;
 
-disable_resets:
-	reset_control_assert(hpriv->rsts);
+disable_rsts:
+	ahci_platform_assert_rsts(hpriv);
 
 disable_clks:
 	ahci_platform_disable_clks(hpriv);
@@ -274,7 +319,7 @@ void ahci_platform_disable_resources(struct ahci_host_priv *hpriv)
 {
 	ahci_platform_disable_phys(hpriv);
 
-	reset_control_assert(hpriv->rsts);
+	ahci_platform_assert_rsts(hpriv);
 
 	ahci_platform_disable_clks(hpriv);
 
@@ -292,8 +337,6 @@ static void ahci_platform_put_resources(struct device *dev, void *res)
 		pm_runtime_disable(dev);
 	}
 
-	for (c = 0; c < AHCI_MAX_CLKS && hpriv->clks[c]; c++)
-		clk_put(hpriv->clks[c]);
 	/*
 	 * The regulators are tied to child node device and not to the
 	 * SATA device itself. So we can't use devm for automatically
@@ -363,6 +406,34 @@ static int ahci_platform_get_regulator(struct ahci_host_priv *hpriv, u32 port,
 	return rc;
 }
 
+static int ahci_platform_get_firmware(struct ahci_host_priv *hpriv,
+				      struct device *dev)
+{
+	struct device_node *child;
+	u32 port;
+
+	if (!of_property_read_u32(dev->of_node, "hba-cap", &hpriv->saved_cap))
+		hpriv->saved_cap &= (HOST_CAP_SSS | HOST_CAP_MPS);
+
+	of_property_read_u32(dev->of_node,
+			     "ports-implemented", &hpriv->saved_port_map);
+
+	for_each_child_of_node(dev->of_node, child) {
+		if (!of_device_is_available(child))
+			continue;
+
+		if (of_property_read_u32(child, "reg", &port)) {
+			of_node_put(child);
+			return -EINVAL;
+		}
+
+		if (!of_property_read_u32(child, "hba-port-cap", &hpriv->saved_port_cap[port]))
+			hpriv->saved_port_cap[port] &= PORT_CMD_CAP;
+	}
+
+	return 0;
+}
+
 /**
  * ahci_platform_get_resources - Get platform resources
  * @pdev: platform device to get resources for
@@ -374,8 +445,8 @@ static int ahci_platform_get_regulator(struct ahci_host_priv *hpriv, u32 port,
  * 1) mmio registers (IORESOURCE_MEM 0, mandatory)
  * 2) regulator for controlling the targets power (optional)
  *    regulator for controlling the AHCI controller (optional)
- * 3) 0 - AHCI_MAX_CLKS clocks, as specified in the devs devicetree node,
- *    or for non devicetree enabled platforms a single clock
+ * 3) all clocks specified in the devicetree node, or a single
+ *    clock for non-OF platforms (optional)
  * 4) resets, if flags has AHCI_PLATFORM_GET_RESETS (optional)
  * 5) phys (optional)
  *
@@ -385,11 +456,10 @@ static int ahci_platform_get_regulator(struct ahci_host_priv *hpriv, u32 port,
 struct ahci_host_priv *ahci_platform_get_resources(struct platform_device *pdev,
 						   unsigned int flags)
 {
+	int child_nodes, rc = -ENOMEM, enabled_ports = 0;
 	struct device *dev = &pdev->dev;
 	struct ahci_host_priv *hpriv;
-	struct clk *clk;
 	struct device_node *child;
-	int i, enabled_ports = 0, rc = -ENOMEM, child_nodes;
 	u32 mask_port_map = 0;
 
 	if (!devres_open_group(dev, NULL, GFP_KERNEL))
@@ -402,32 +472,51 @@ struct ahci_host_priv *ahci_platform_get_resources(struct platform_device *pdev,
 
 	devres_add(dev, hpriv);
 
-	hpriv->mmio = devm_ioremap_resource(dev,
-			      platform_get_resource(pdev, IORESOURCE_MEM, 0));
+	/*
+	 * If the DT provided an "ahci" named resource, use it. Otherwise,
+	 * fallback to using the default first resource for the device node.
+	 */
+	if (platform_get_resource_byname(pdev, IORESOURCE_MEM, "ahci"))
+		hpriv->mmio = devm_platform_ioremap_resource_byname(pdev, "ahci");
+	else
+		hpriv->mmio = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(hpriv->mmio)) {
 		rc = PTR_ERR(hpriv->mmio);
 		goto err_out;
 	}
 
-	for (i = 0; i < AHCI_MAX_CLKS; i++) {
+	/*
+	 * Bulk clocks getting procedure can fail to find any clock due to
+	 * running on a non-OF platform or due to the clocks being defined in
+	 * bypass of the DT firmware (like da850, spear13xx). In that case we
+	 * fallback to getting a single clock source right from the dev clocks
+	 * list.
+	 */
+	rc = devm_clk_bulk_get_all(dev, &hpriv->clks);
+	if (rc < 0)
+		goto err_out;
+
+	if (rc > 0) {
+		/* Got clocks in bulk */
+		hpriv->n_clks = rc;
+	} else {
 		/*
-		 * For now we must use clk_get(dev, NULL) for the first clock,
-		 * because some platforms (da850, spear13xx) are not yet
-		 * converted to use devicetree for clocks.  For new platforms
-		 * this is equivalent to of_clk_get(dev->of_node, 0).
+		 * No clock bulk found: fallback to manually getting
+		 * the optional clock.
 		 */
-		if (i == 0)
-			clk = clk_get(dev, NULL);
-		else
-			clk = of_clk_get(dev->of_node, i);
-
-		if (IS_ERR(clk)) {
-			rc = PTR_ERR(clk);
-			if (rc == -EPROBE_DEFER)
-				goto err_out;
-			break;
+		hpriv->clks = devm_kzalloc(dev, sizeof(*hpriv->clks), GFP_KERNEL);
+		if (!hpriv->clks) {
+			rc = -ENOMEM;
+			goto err_out;
+		}
+		hpriv->clks->clk = devm_clk_get_optional(dev, NULL);
+		if (IS_ERR(hpriv->clks->clk)) {
+			rc = PTR_ERR(hpriv->clks->clk);
+			goto err_out;
+		} else if (hpriv->clks->clk) {
+			hpriv->clks->id = "ahci";
+			hpriv->n_clks = 1;
 		}
-		hpriv->clks[i] = clk;
 	}
 
 	hpriv->ahci_regulator = devm_regulator_get(dev, "ahci");
@@ -449,16 +538,28 @@ struct ahci_host_priv *ahci_platform_get_resources(struct platform_device *pdev,
 			rc = PTR_ERR(hpriv->rsts);
 			goto err_out;
 		}
+
+		hpriv->f_rsts = flags & AHCI_PLATFORM_RST_TRIGGER;
 	}
 
-	hpriv->nports = child_nodes = of_get_child_count(dev->of_node);
+	/*
+	 * Too many sub-nodes most likely means having something wrong with
+	 * the firmware.
+	 */
+	child_nodes = of_get_child_count(dev->of_node);
+	if (child_nodes > AHCI_MAX_PORTS) {
+		rc = -EINVAL;
+		goto err_out;
+	}
 
 	/*
 	 * If no sub-node was found, we still need to set nports to
 	 * one in order to be able to use the
 	 * ahci_platform_[en|dis]able_[phys|regulators] functions.
 	 */
-	if (!child_nodes)
+	if (child_nodes)
+		hpriv->nports = child_nodes;
+	else
 		hpriv->nports = 1;
 
 	hpriv->phys = devm_kcalloc(dev, hpriv->nports, sizeof(*hpriv->phys), GFP_KERNEL);
@@ -540,6 +641,15 @@ struct ahci_host_priv *ahci_platform_get_resources(struct platform_device *pdev,
 		if (rc == -EPROBE_DEFER)
 			goto err_out;
 	}
+
+	/*
+	 * Retrieve firmware-specific flags which then will be used to set
+	 * the HW-init fields of HBA and its ports
+	 */
+	rc = ahci_platform_get_firmware(hpriv, dev);
+	if (rc)
+		goto err_out;
+
 	pm_runtime_enable(dev);
 	pm_runtime_get_sync(dev);
 	hpriv->got_runtime_pm = true;