// SPDX-License-Identifier: GPL-2.0-or-later/* * AHCI SATA platform library * * Copyright 2004-2005 Red Hat, Inc. * Jeff Garzik <jgarzik@pobox.com> * Copyright 2010 MontaVista Software, LLC. * Anton Vorontsov <avorontsov@ru.mvista.com> */ #include <linux/clk.h>#include <linux/kernel.h>#include <linux/gfp.h>#include <linux/module.h>#include <linux/pm.h>#include <linux/interrupt.h>#include <linux/device.h>#include <linux/platform_device.h>#include <linux/libata.h>#include <linux/ahci_platform.h>#include <linux/phy/phy.h>#include <linux/pm_runtime.h>#include <linux/of.h>#include <linux/of_platform.h>#include <linux/reset.h>#include "ahci.h" static void ahci_host_stop(struct ata_host *host); struct ata_port_operations ahci_platform_ops = { .inherits = &ahci_ops, .host_stop = ahci_host_stop,};EXPORT_SYMBOL_GPL(ahci_platform_ops); /** * ahci_platform_enable_phys - Enable PHYs * @hpriv: host private area to store config values * * This function enables all the PHYs found in hpriv->phys, if any. * If a PHY fails to be enabled, it disables all the PHYs already * enabled in reverse order and returns an error. * * RETURNS: * 0 on success otherwise a negative error code */int ahci_platform_enable_phys(struct ahci_host_priv *hpriv){ int rc, i; for (i = 0; i < hpriv->nports; i++) { if (ahci_ignore_port(hpriv, i)) continue; rc = phy_init(hpriv->phys[i]); if (rc) goto disable_phys; rc = phy_set_mode(hpriv->phys[i], PHY_MODE_SATA); if (rc) { phy_exit(hpriv->phys[i]); goto disable_phys; } rc = phy_power_on(hpriv->phys[i]); if (rc) { phy_exit(hpriv->phys[i]); goto disable_phys; } } return 0; disable_phys: while (--i >= 0) { if (ahci_ignore_port(hpriv, i)) continue; phy_power_off(hpriv->phys[i]); phy_exit(hpriv->phys[i]); } return rc;}EXPORT_SYMBOL_GPL(ahci_platform_enable_phys); /** * ahci_platform_disable_phys - Disable PHYs * @hpriv: host private area to store config values * * This function disables all PHYs found in hpriv->phys. */void ahci_platform_disable_phys(struct ahci_host_priv *hpriv){ int i; for (i = 0; i < hpriv->nports; i++) { if (ahci_ignore_port(hpriv, i)) continue; phy_power_off(hpriv->phys[i]); phy_exit(hpriv->phys[i]); }}EXPORT_SYMBOL_GPL(ahci_platform_disable_phys); /** * ahci_platform_find_clk - Find platform clock * @hpriv: host private area to store config values * @con_id: clock connection ID * * This function returns a pointer to the clock descriptor of the clock with * the passed ID. * * RETURNS: * Pointer to the clock descriptor on success otherwise NULL */struct clk *ahci_platform_find_clk(struct ahci_host_priv *hpriv, const char *con_id){ int i; for (i = 0; i < hpriv->n_clks; i++) { if (hpriv->clks[i].id && !strcmp(hpriv->clks[i].id, con_id)) return hpriv->clks[i].clk; } 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); /** * ahci_platform_disable_clks - Disable platform clocks * @hpriv: host private area to store config values * * 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){ 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 * * This function enables all the regulators found in controller and * hpriv->target_pwrs, if any. If a regulator fails to be enabled, it * disables all the regulators already enabled in reverse order and * returns an error. * * RETURNS: * 0 on success otherwise a negative error code */int ahci_platform_enable_regulators(struct ahci_host_priv *hpriv){ int rc, i; rc = regulator_enable(hpriv->ahci_regulator); if (rc) return rc; rc = regulator_enable(hpriv->phy_regulator); if (rc) goto disable_ahci_pwrs; for (i = 0; i < hpriv->nports; i++) { if (!hpriv->target_pwrs[i]) continue; rc = regulator_enable(hpriv->target_pwrs[i]); if (rc) goto disable_target_pwrs; } return 0; disable_target_pwrs: while (--i >= 0) if (hpriv->target_pwrs[i]) regulator_disable(hpriv->target_pwrs[i]); regulator_disable(hpriv->phy_regulator);disable_ahci_pwrs: regulator_disable(hpriv->ahci_regulator); return rc;}EXPORT_SYMBOL_GPL(ahci_platform_enable_regulators); /** * ahci_platform_disable_regulators - Disable regulators * @hpriv: host private area to store config values * * This function disables all regulators found in hpriv->target_pwrs and * AHCI controller. */void ahci_platform_disable_regulators(struct ahci_host_priv *hpriv){ int i; for (i = 0; i < hpriv->nports; i++) { if (!hpriv->target_pwrs[i]) continue; regulator_disable(hpriv->target_pwrs[i]); } regulator_disable(hpriv->ahci_regulator); regulator_disable(hpriv->phy_regulator);}EXPORT_SYMBOL_GPL(ahci_platform_disable_regulators);/** * ahci_platform_enable_resources - Enable platform resources * @hpriv: host private area to store config values * * This function enables all ahci_platform managed resources in the * following order: * 1) Regulator * 2) Clocks (through ahci_platform_enable_clks) * 3) Resets * 4) Phys * * If resource enabling fails at any point the previous enabled resources * are disabled in reverse order. * * RETURNS: * 0 on success otherwise a negative error code */int ahci_platform_enable_resources(struct ahci_host_priv *hpriv){ int rc; rc = ahci_platform_enable_regulators(hpriv); if (rc) return rc; rc = ahci_platform_enable_clks(hpriv); if (rc) goto disable_regulator; rc = ahci_platform_deassert_rsts(hpriv); if (rc) goto disable_clks; rc = ahci_platform_enable_phys(hpriv); if (rc) goto disable_rsts; return 0; disable_rsts: ahci_platform_assert_rsts(hpriv); disable_clks: ahci_platform_disable_clks(hpriv); disable_regulator: ahci_platform_disable_regulators(hpriv); return rc;}EXPORT_SYMBOL_GPL(ahci_platform_enable_resources); /** * ahci_platform_disable_resources - Disable platform resources * @hpriv: host private area to store config values * * This function disables all ahci_platform managed resources in the * following order: * 1) Phys * 2) Resets * 3) Clocks (through ahci_platform_disable_clks) * 4) Regulator */void ahci_platform_disable_resources(struct ahci_host_priv *hpriv){ ahci_platform_disable_phys(hpriv); ahci_platform_assert_rsts(hpriv); ahci_platform_disable_clks(hpriv); ahci_platform_disable_regulators(hpriv);}EXPORT_SYMBOL_GPL(ahci_platform_disable_resources); static void ahci_platform_put_resources(struct device *dev, void *res){ struct ahci_host_priv *hpriv = res; int c; if (hpriv->got_runtime_pm) { pm_runtime_put_sync(dev); pm_runtime_disable(dev); } /* * The regulators are tied to child node device and not to the * SATA device itself. So we can't use devm for automatically * releasing them. We have to do it manually here. */ for (c = 0; c < hpriv->nports; c++) if (hpriv->target_pwrs && hpriv->target_pwrs[c]) regulator_put(hpriv->target_pwrs[c]); kfree(hpriv->target_pwrs);} static int ahci_platform_get_phy(struct ahci_host_priv *hpriv, u32 port, struct device *dev, struct device_node *node){ int rc; hpriv->phys[port] = devm_of_phy_get(dev, node, NULL); if (!IS_ERR(hpriv->phys[port])) return 0; rc = PTR_ERR(hpriv->phys[port]); switch (rc) { case -ENOSYS: /* No PHY support. Check if PHY is required. */ if (of_property_present(node, "phys")) { dev_err(dev, "couldn't get PHY in node %pOFn: ENOSYS\n", node); break; } fallthrough; case -ENODEV: /* continue normally */ hpriv->phys[port] = NULL; rc = 0; break; case -EPROBE_DEFER: /* Do not complain yet */ break; default: dev_err(dev, "couldn't get PHY in node %pOFn: %d\n", node, rc); break; } return rc;} static int ahci_platform_get_regulator(struct ahci_host_priv *hpriv, u32 port, struct device *dev){ struct regulator *target_pwr; int rc = 0; target_pwr = regulator_get(dev, "target"); if (!IS_ERR(target_pwr)) hpriv->target_pwrs[port] = target_pwr; else rc = PTR_ERR(target_pwr); return rc;} static int ahci_platform_get_firmware(struct ahci_host_priv *hpriv, struct device *dev){ 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_scoped(dev->of_node, child) { if (!of_device_is_available(child)) continue; if (of_property_read_u32(child, "reg", &port)) 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;} static u32 ahci_platform_find_max_port_id(struct device *dev){ u32 max_port = 0; for_each_child_of_node_scoped(dev->of_node, child) { u32 port; if (!of_property_read_u32(child, "reg", &port)) max_port = max(max_port, port); } return max_port;} /** * ahci_platform_get_resources - Get platform resources * @pdev: platform device to get resources for * @flags: bitmap representing the resource to get * * This function allocates an ahci_host_priv struct, and gets the following * resources, storing a reference to them inside the returned struct: * * 1) mmio registers (IORESOURCE_MEM 0, mandatory) * 2) regulator for controlling the targets power (optional) * regulator for controlling the AHCI controller (optional) * 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) * * RETURNS: * The allocated ahci_host_priv on success, otherwise an ERR_PTR value */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; u32 mask_port_map = 0; u32 max_port; int nports; if (!devres_open_group(dev, NULL, GFP_KERNEL)) return ERR_PTR(-ENOMEM); /* find maximum port id for allocating structures */ max_port = ahci_platform_find_max_port_id(dev); /* * Set nports according to maximum port id. Clamp at * AHCI_MAX_PORTS, warning message for invalid port id * is generated later. * When DT has no sub-nodes max_port is 0, nports is 1, * in order to be able to use the * ahci_platform_[en|dis]able_[phys|regulators] functions. */ nports = min(AHCI_MAX_PORTS, max_port + 1);Lines 1–500 of 967. Load more
// SPDX-License-Identifier: GPL-2.0-or-later /* * AHCI SATA platform library * * Copyright 2004-2005 Red Hat, Inc. * Jeff Garzik <jgarzik@pobox.com> * Copyright 2010 MontaVista Software, LLC. * Anton Vorontsov <avorontsov@ru.mvista.com> */ #include <linux/clk.h> #include <linux/kernel.h> #include <linux/gfp.h> #include <linux/module.h> #include <linux/pm.h> #include <linux/interrupt.h> #include <linux/device.h> #include <linux/platform_device.h> #include <linux/libata.h> #include <linux/ahci_platform.h> #include <linux/phy/phy.h> #include <linux/pm_runtime.h> #include <linux/of.h> #include <linux/of_platform.h> #include <linux/reset.h> #include "ahci.h" static void ahci_host_stop(struct ata_host *host); struct ata_port_operations ahci_platform_ops = { .inherits = &ahci_ops, .host_stop = ahci_host_stop, }; EXPORT_SYMBOL_GPL(ahci_platform_ops); /** * ahci_platform_enable_phys - Enable PHYs * @hpriv: host private area to store config values * * This function enables all the PHYs found in hpriv->phys, if any. * If a PHY fails to be enabled, it disables all the PHYs already * enabled in reverse order and returns an error. * * RETURNS: * 0 on success otherwise a negative error code */ int ahci_platform_enable_phys(struct ahci_host_priv *hpriv) { int rc, i; for (i = 0; i < hpriv->nports; i++) { if (ahci_ignore_port(hpriv, i)) continue; rc = phy_init(hpriv->phys[i]); if (rc) goto disable_phys; rc = phy_set_mode(hpriv->phys[i], PHY_MODE_SATA); if (rc) { phy_exit(hpriv->phys[i]); goto disable_phys; } rc = phy_power_on(hpriv->phys[i]); if (rc) { phy_exit(hpriv->phys[i]); goto disable_phys; } } return 0; disable_phys: while (--i >= 0) { if (ahci_ignore_port(hpriv, i)) continue; phy_power_off(hpriv->phys[i]); phy_exit(hpriv->phys[i]); } return rc; } EXPORT_SYMBOL_GPL(ahci_platform_enable_phys); /** * ahci_platform_disable_phys - Disable PHYs * @hpriv: host private area to store config values * * This function disables all PHYs found in hpriv->phys. */ void ahci_platform_disable_phys(struct ahci_host_priv *hpriv) { int i; for (i = 0; i < hpriv->nports; i++) { if (ahci_ignore_port(hpriv, i)) continue; phy_power_off(hpriv->phys[i]); phy_exit(hpriv->phys[i]); } } EXPORT_SYMBOL_GPL(ahci_platform_disable_phys); /** * ahci_platform_find_clk - Find platform clock * @hpriv: host private area to store config values * @con_id: clock connection ID * * This function returns a pointer to the clock descriptor of the clock with * the passed ID. * * RETURNS: * Pointer to the clock descriptor on success otherwise NULL */ struct clk *ahci_platform_find_clk(struct ahci_host_priv *hpriv, const char *con_id) { int i; for (i = 0; i < hpriv->n_clks; i++) { if (hpriv->clks[i].id && !strcmp(hpriv->clks[i].id, con_id)) return hpriv->clks[i].clk; } 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); /** * ahci_platform_disable_clks - Disable platform clocks * @hpriv: host private area to store config values * * 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) { 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 * * This function enables all the regulators found in controller and * hpriv->target_pwrs, if any. If a regulator fails to be enabled, it * disables all the regulators already enabled in reverse order and * returns an error. * * RETURNS: * 0 on success otherwise a negative error code */ int ahci_platform_enable_regulators(struct ahci_host_priv *hpriv) { int rc, i; rc = regulator_enable(hpriv->ahci_regulator); if (rc) return rc; rc = regulator_enable(hpriv->phy_regulator); if (rc) goto disable_ahci_pwrs; for (i = 0; i < hpriv->nports; i++) { if (!hpriv->target_pwrs[i]) continue; rc = regulator_enable(hpriv->target_pwrs[i]); if (rc) goto disable_target_pwrs; } return 0; disable_target_pwrs: while (--i >= 0) if (hpriv->target_pwrs[i]) regulator_disable(hpriv->target_pwrs[i]); regulator_disable(hpriv->phy_regulator); disable_ahci_pwrs: regulator_disable(hpriv->ahci_regulator); return rc; } EXPORT_SYMBOL_GPL(ahci_platform_enable_regulators); /** * ahci_platform_disable_regulators - Disable regulators * @hpriv: host private area to store config values * * This function disables all regulators found in hpriv->target_pwrs and * AHCI controller. */ void ahci_platform_disable_regulators(struct ahci_host_priv *hpriv) { int i; for (i = 0; i < hpriv->nports; i++) { if (!hpriv->target_pwrs[i]) continue; regulator_disable(hpriv->target_pwrs[i]); } regulator_disable(hpriv->ahci_regulator); regulator_disable(hpriv->phy_regulator); } EXPORT_SYMBOL_GPL(ahci_platform_disable_regulators); /** * ahci_platform_enable_resources - Enable platform resources * @hpriv: host private area to store config values * * This function enables all ahci_platform managed resources in the * following order: * 1) Regulator * 2) Clocks (through ahci_platform_enable_clks) * 3) Resets * 4) Phys * * If resource enabling fails at any point the previous enabled resources * are disabled in reverse order. * * RETURNS: * 0 on success otherwise a negative error code */ int ahci_platform_enable_resources(struct ahci_host_priv *hpriv) { int rc; rc = ahci_platform_enable_regulators(hpriv); if (rc) return rc; rc = ahci_platform_enable_clks(hpriv); if (rc) goto disable_regulator; rc = ahci_platform_deassert_rsts(hpriv); if (rc) goto disable_clks; rc = ahci_platform_enable_phys(hpriv); if (rc) goto disable_rsts; return 0; disable_rsts: ahci_platform_assert_rsts(hpriv); disable_clks: ahci_platform_disable_clks(hpriv); disable_regulator: ahci_platform_disable_regulators(hpriv); return rc; } EXPORT_SYMBOL_GPL(ahci_platform_enable_resources); /** * ahci_platform_disable_resources - Disable platform resources * @hpriv: host private area to store config values * * This function disables all ahci_platform managed resources in the * following order: * 1) Phys * 2) Resets * 3) Clocks (through ahci_platform_disable_clks) * 4) Regulator */ void ahci_platform_disable_resources(struct ahci_host_priv *hpriv) { ahci_platform_disable_phys(hpriv); ahci_platform_assert_rsts(hpriv); ahci_platform_disable_clks(hpriv); ahci_platform_disable_regulators(hpriv); } EXPORT_SYMBOL_GPL(ahci_platform_disable_resources); static void ahci_platform_put_resources(struct device *dev, void *res) { struct ahci_host_priv *hpriv = res; int c; if (hpriv->got_runtime_pm) { pm_runtime_put_sync(dev); pm_runtime_disable(dev); } /* * The regulators are tied to child node device and not to the * SATA device itself. So we can't use devm for automatically * releasing them. We have to do it manually here. */ for (c = 0; c < hpriv->nports; c++) if (hpriv->target_pwrs && hpriv->target_pwrs[c]) regulator_put(hpriv->target_pwrs[c]); kfree(hpriv->target_pwrs); } static int ahci_platform_get_phy(struct ahci_host_priv *hpriv, u32 port, struct device *dev, struct device_node *node) { int rc; hpriv->phys[port] = devm_of_phy_get(dev, node, NULL); if (!IS_ERR(hpriv->phys[port])) return 0; rc = PTR_ERR(hpriv->phys[port]); switch (rc) { case -ENOSYS: /* No PHY support. Check if PHY is required. */ if (of_property_present(node, "phys")) { dev_err(dev, "couldn't get PHY in node %pOFn: ENOSYS\n", node); break; } fallthrough; case -ENODEV: /* continue normally */ hpriv->phys[port] = NULL; rc = 0; break; case -EPROBE_DEFER: /* Do not complain yet */ break; default: dev_err(dev, "couldn't get PHY in node %pOFn: %d\n", node, rc); break; } return rc; } static int ahci_platform_get_regulator(struct ahci_host_priv *hpriv, u32 port, struct device *dev) { struct regulator *target_pwr; int rc = 0; target_pwr = regulator_get(dev, "target"); if (!IS_ERR(target_pwr)) hpriv->target_pwrs[port] = target_pwr; else rc = PTR_ERR(target_pwr); return rc; } static int ahci_platform_get_firmware(struct ahci_host_priv *hpriv, struct device *dev) { 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_scoped(dev->of_node, child) { if (!of_device_is_available(child)) continue; if (of_property_read_u32(child, "reg", &port)) 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; } static u32 ahci_platform_find_max_port_id(struct device *dev) { u32 max_port = 0; for_each_child_of_node_scoped(dev->of_node, child) { u32 port; if (!of_property_read_u32(child, "reg", &port)) max_port = max(max_port, port); } return max_port; } /** * ahci_platform_get_resources - Get platform resources * @pdev: platform device to get resources for * @flags: bitmap representing the resource to get * * This function allocates an ahci_host_priv struct, and gets the following * resources, storing a reference to them inside the returned struct: * * 1) mmio registers (IORESOURCE_MEM 0, mandatory) * 2) regulator for controlling the targets power (optional) * regulator for controlling the AHCI controller (optional) * 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) * * RETURNS: * The allocated ahci_host_priv on success, otherwise an ERR_PTR value */ 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; u32 mask_port_map = 0; u32 max_port; int nports; if (!devres_open_group(dev, NULL, GFP_KERNEL)) return ERR_PTR(-ENOMEM); /* find maximum port id for allocating structures */ max_port = ahci_platform_find_max_port_id(dev); /* * Set nports according to maximum port id. Clamp at * AHCI_MAX_PORTS, warning message for invalid port id * is generated later. * When DT has no sub-nodes max_port is 0, nports is 1, * in order to be able to use the * ahci_platform_[en|dis]able_[phys|regulators] functions. */ nports = min(AHCI_MAX_PORTS, max_port + 1);