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852 lines
21 KiB
852 lines
21 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* AHCI SATA platform library |
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* |
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* Copyright 2004-2005 Red Hat, Inc. |
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* Jeff Garzik <[email protected]> |
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* Copyright 2010 MontaVista Software, LLC. |
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* Anton Vorontsov <[email protected]> |
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*/ |
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|
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#include <linux/clk.h> |
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#include <linux/kernel.h> |
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#include <linux/gfp.h> |
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#include <linux/module.h> |
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#include <linux/pm.h> |
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#include <linux/interrupt.h> |
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#include <linux/device.h> |
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#include <linux/platform_device.h> |
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#include <linux/libata.h> |
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#include <linux/ahci_platform.h> |
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#include <linux/phy/phy.h> |
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#include <linux/pm_runtime.h> |
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#include <linux/of_platform.h> |
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#include <linux/reset.h> |
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#include "ahci.h" |
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|
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static void ahci_host_stop(struct ata_host *host); |
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struct ata_port_operations ahci_platform_ops = { |
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.inherits = &ahci_ops, |
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.host_stop = ahci_host_stop, |
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}; |
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EXPORT_SYMBOL_GPL(ahci_platform_ops); |
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|
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/** |
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* ahci_platform_enable_phys - Enable PHYs |
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* @hpriv: host private area to store config values |
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* |
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* This function enables all the PHYs found in hpriv->phys, if any. |
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* If a PHY fails to be enabled, it disables all the PHYs already |
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* enabled in reverse order and returns an error. |
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* |
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* RETURNS: |
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* 0 on success otherwise a negative error code |
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*/ |
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int ahci_platform_enable_phys(struct ahci_host_priv *hpriv) |
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{ |
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int rc, i; |
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for (i = 0; i < hpriv->nports; i++) { |
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rc = phy_init(hpriv->phys[i]); |
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if (rc) |
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goto disable_phys; |
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rc = phy_set_mode(hpriv->phys[i], PHY_MODE_SATA); |
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if (rc) { |
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phy_exit(hpriv->phys[i]); |
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goto disable_phys; |
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} |
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rc = phy_power_on(hpriv->phys[i]); |
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if (rc && !(rc == -EOPNOTSUPP && (hpriv->flags & AHCI_HFLAG_IGN_NOTSUPP_POWER_ON))) { |
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phy_exit(hpriv->phys[i]); |
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goto disable_phys; |
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} |
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} |
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return 0; |
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disable_phys: |
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while (--i >= 0) { |
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phy_power_off(hpriv->phys[i]); |
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phy_exit(hpriv->phys[i]); |
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} |
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return rc; |
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} |
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EXPORT_SYMBOL_GPL(ahci_platform_enable_phys); |
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|
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/** |
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* ahci_platform_disable_phys - Disable PHYs |
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* @hpriv: host private area to store config values |
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* |
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* This function disables all PHYs found in hpriv->phys. |
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*/ |
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void ahci_platform_disable_phys(struct ahci_host_priv *hpriv) |
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{ |
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int i; |
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for (i = 0; i < hpriv->nports; i++) { |
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phy_power_off(hpriv->phys[i]); |
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phy_exit(hpriv->phys[i]); |
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} |
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} |
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EXPORT_SYMBOL_GPL(ahci_platform_disable_phys); |
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|
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/** |
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* ahci_platform_enable_clks - Enable platform clocks |
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* @hpriv: host private area to store config values |
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* |
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* This function enables all the clks found in hpriv->clks, starting at |
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* index 0. If any clk fails to enable it disables all the clks already |
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* enabled in reverse order, and then returns an error. |
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* |
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* RETURNS: |
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* 0 on success otherwise a negative error code |
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*/ |
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int ahci_platform_enable_clks(struct ahci_host_priv *hpriv) |
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{ |
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int c, rc; |
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for (c = 0; c < AHCI_MAX_CLKS && hpriv->clks[c]; c++) { |
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rc = clk_prepare_enable(hpriv->clks[c]); |
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if (rc) |
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goto disable_unprepare_clk; |
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} |
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return 0; |
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disable_unprepare_clk: |
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while (--c >= 0) |
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clk_disable_unprepare(hpriv->clks[c]); |
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return rc; |
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} |
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EXPORT_SYMBOL_GPL(ahci_platform_enable_clks); |
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|
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/** |
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* ahci_platform_disable_clks - Disable platform clocks |
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* @hpriv: host private area to store config values |
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* |
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* This function disables all the clks found in hpriv->clks, in reverse |
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* order of ahci_platform_enable_clks (starting at the end of the array). |
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*/ |
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void ahci_platform_disable_clks(struct ahci_host_priv *hpriv) |
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{ |
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int c; |
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for (c = AHCI_MAX_CLKS - 1; c >= 0; c--) |
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if (hpriv->clks[c]) |
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clk_disable_unprepare(hpriv->clks[c]); |
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} |
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EXPORT_SYMBOL_GPL(ahci_platform_disable_clks); |
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|
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/** |
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* ahci_platform_enable_regulators - Enable regulators |
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* @hpriv: host private area to store config values |
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* |
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* This function enables all the regulators found in controller and |
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* hpriv->target_pwrs, if any. If a regulator fails to be enabled, it |
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* disables all the regulators already enabled in reverse order and |
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* returns an error. |
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* |
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* RETURNS: |
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* 0 on success otherwise a negative error code |
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*/ |
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int ahci_platform_enable_regulators(struct ahci_host_priv *hpriv) |
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{ |
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int rc, i; |
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rc = regulator_enable(hpriv->ahci_regulator); |
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if (rc) |
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return rc; |
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rc = regulator_enable(hpriv->phy_regulator); |
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if (rc) |
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goto disable_ahci_pwrs; |
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for (i = 0; i < hpriv->nports; i++) { |
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if (!hpriv->target_pwrs[i]) |
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continue; |
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rc = regulator_enable(hpriv->target_pwrs[i]); |
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if (rc) |
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goto disable_target_pwrs; |
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} |
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return 0; |
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disable_target_pwrs: |
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while (--i >= 0) |
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if (hpriv->target_pwrs[i]) |
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regulator_disable(hpriv->target_pwrs[i]); |
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regulator_disable(hpriv->phy_regulator); |
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disable_ahci_pwrs: |
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regulator_disable(hpriv->ahci_regulator); |
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return rc; |
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} |
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EXPORT_SYMBOL_GPL(ahci_platform_enable_regulators); |
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|
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/** |
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* ahci_platform_disable_regulators - Disable regulators |
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* @hpriv: host private area to store config values |
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* |
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* This function disables all regulators found in hpriv->target_pwrs and |
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* AHCI controller. |
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*/ |
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void ahci_platform_disable_regulators(struct ahci_host_priv *hpriv) |
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{ |
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int i; |
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for (i = 0; i < hpriv->nports; i++) { |
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if (!hpriv->target_pwrs[i]) |
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continue; |
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regulator_disable(hpriv->target_pwrs[i]); |
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} |
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regulator_disable(hpriv->ahci_regulator); |
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regulator_disable(hpriv->phy_regulator); |
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} |
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EXPORT_SYMBOL_GPL(ahci_platform_disable_regulators); |
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/** |
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* ahci_platform_enable_resources - Enable platform resources |
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* @hpriv: host private area to store config values |
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* |
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* This function enables all ahci_platform managed resources in the |
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* following order: |
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* 1) Regulator |
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* 2) Clocks (through ahci_platform_enable_clks) |
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* 3) Resets |
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* 4) Phys |
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* |
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* If resource enabling fails at any point the previous enabled resources |
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* are disabled in reverse order. |
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* |
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* RETURNS: |
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* 0 on success otherwise a negative error code |
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*/ |
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int ahci_platform_enable_resources(struct ahci_host_priv *hpriv) |
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{ |
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int rc; |
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rc = ahci_platform_enable_regulators(hpriv); |
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if (rc) |
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return rc; |
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rc = ahci_platform_enable_clks(hpriv); |
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if (rc) |
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goto disable_regulator; |
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rc = reset_control_deassert(hpriv->rsts); |
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if (rc) |
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goto disable_clks; |
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rc = ahci_platform_enable_phys(hpriv); |
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if (rc) |
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goto disable_resets; |
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return 0; |
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disable_resets: |
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reset_control_assert(hpriv->rsts); |
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disable_clks: |
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ahci_platform_disable_clks(hpriv); |
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disable_regulator: |
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ahci_platform_disable_regulators(hpriv); |
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return rc; |
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} |
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EXPORT_SYMBOL_GPL(ahci_platform_enable_resources); |
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/** |
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* ahci_platform_disable_resources - Disable platform resources |
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* @hpriv: host private area to store config values |
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* |
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* This function disables all ahci_platform managed resources in the |
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* following order: |
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* 1) Phys |
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* 2) Resets |
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* 3) Clocks (through ahci_platform_disable_clks) |
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* 4) Regulator |
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*/ |
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void ahci_platform_disable_resources(struct ahci_host_priv *hpriv) |
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{ |
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ahci_platform_disable_phys(hpriv); |
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reset_control_assert(hpriv->rsts); |
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ahci_platform_disable_clks(hpriv); |
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ahci_platform_disable_regulators(hpriv); |
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} |
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EXPORT_SYMBOL_GPL(ahci_platform_disable_resources); |
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static void ahci_platform_put_resources(struct device *dev, void *res) |
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{ |
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struct ahci_host_priv *hpriv = res; |
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int c; |
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if (hpriv->got_runtime_pm) { |
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pm_runtime_put_sync(dev); |
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pm_runtime_disable(dev); |
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} |
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for (c = 0; c < AHCI_MAX_CLKS && hpriv->clks[c]; c++) |
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clk_put(hpriv->clks[c]); |
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/* |
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* The regulators are tied to child node device and not to the |
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* SATA device itself. So we can't use devm for automatically |
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* releasing them. We have to do it manually here. |
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*/ |
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for (c = 0; c < hpriv->nports; c++) |
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if (hpriv->target_pwrs && hpriv->target_pwrs[c]) |
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regulator_put(hpriv->target_pwrs[c]); |
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kfree(hpriv->target_pwrs); |
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} |
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static int ahci_platform_get_phy(struct ahci_host_priv *hpriv, u32 port, |
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struct device *dev, struct device_node *node) |
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{ |
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int rc; |
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hpriv->phys[port] = devm_of_phy_get(dev, node, NULL); |
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if (!IS_ERR(hpriv->phys[port])) |
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return 0; |
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rc = PTR_ERR(hpriv->phys[port]); |
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switch (rc) { |
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case -ENOSYS: |
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/* No PHY support. Check if PHY is required. */ |
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if (of_find_property(node, "phys", NULL)) { |
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dev_err(dev, |
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"couldn't get PHY in node %pOFn: ENOSYS\n", |
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node); |
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break; |
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} |
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fallthrough; |
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case -ENODEV: |
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/* continue normally */ |
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hpriv->phys[port] = NULL; |
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rc = 0; |
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break; |
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case -EPROBE_DEFER: |
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/* Do not complain yet */ |
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break; |
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default: |
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dev_err(dev, |
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"couldn't get PHY in node %pOFn: %d\n", |
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node, rc); |
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break; |
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} |
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return rc; |
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} |
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static int ahci_platform_get_regulator(struct ahci_host_priv *hpriv, u32 port, |
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struct device *dev) |
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{ |
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struct regulator *target_pwr; |
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int rc = 0; |
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target_pwr = regulator_get(dev, "target"); |
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if (!IS_ERR(target_pwr)) |
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hpriv->target_pwrs[port] = target_pwr; |
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else |
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rc = PTR_ERR(target_pwr); |
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return rc; |
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} |
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/** |
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* ahci_platform_get_resources - Get platform resources |
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* @pdev: platform device to get resources for |
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* @flags: bitmap representing the resource to get |
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* |
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* This function allocates an ahci_host_priv struct, and gets the following |
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* resources, storing a reference to them inside the returned struct: |
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* |
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* 1) mmio registers (IORESOURCE_MEM 0, mandatory) |
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* 2) regulator for controlling the targets power (optional) |
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* regulator for controlling the AHCI controller (optional) |
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* 3) 0 - AHCI_MAX_CLKS clocks, as specified in the devs devicetree node, |
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* or for non devicetree enabled platforms a single clock |
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* 4) resets, if flags has AHCI_PLATFORM_GET_RESETS (optional) |
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* 5) phys (optional) |
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* |
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* RETURNS: |
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* The allocated ahci_host_priv on success, otherwise an ERR_PTR value |
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*/ |
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struct ahci_host_priv *ahci_platform_get_resources(struct platform_device *pdev, |
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unsigned int flags) |
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{ |
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struct device *dev = &pdev->dev; |
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struct ahci_host_priv *hpriv; |
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struct clk *clk; |
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struct device_node *child; |
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int i, enabled_ports = 0, rc = -ENOMEM, child_nodes; |
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u32 mask_port_map = 0; |
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if (!devres_open_group(dev, NULL, GFP_KERNEL)) |
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return ERR_PTR(-ENOMEM); |
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hpriv = devres_alloc(ahci_platform_put_resources, sizeof(*hpriv), |
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GFP_KERNEL); |
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if (!hpriv) |
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goto err_out; |
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devres_add(dev, hpriv); |
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hpriv->mmio = devm_ioremap_resource(dev, |
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platform_get_resource(pdev, IORESOURCE_MEM, 0)); |
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if (IS_ERR(hpriv->mmio)) { |
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rc = PTR_ERR(hpriv->mmio); |
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goto err_out; |
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} |
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for (i = 0; i < AHCI_MAX_CLKS; i++) { |
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/* |
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* For now we must use clk_get(dev, NULL) for the first clock, |
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* because some platforms (da850, spear13xx) are not yet |
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* converted to use devicetree for clocks. For new platforms |
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* this is equivalent to of_clk_get(dev->of_node, 0). |
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*/ |
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if (i == 0) |
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clk = clk_get(dev, NULL); |
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else |
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clk = of_clk_get(dev->of_node, i); |
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if (IS_ERR(clk)) { |
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rc = PTR_ERR(clk); |
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if (rc == -EPROBE_DEFER) |
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goto err_out; |
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break; |
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} |
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hpriv->clks[i] = clk; |
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} |
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hpriv->ahci_regulator = devm_regulator_get(dev, "ahci"); |
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if (IS_ERR(hpriv->ahci_regulator)) { |
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rc = PTR_ERR(hpriv->ahci_regulator); |
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if (rc != 0) |
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goto err_out; |
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} |
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hpriv->phy_regulator = devm_regulator_get(dev, "phy"); |
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if (IS_ERR(hpriv->phy_regulator)) { |
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rc = PTR_ERR(hpriv->phy_regulator); |
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if (rc == -EPROBE_DEFER) |
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goto err_out; |
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rc = 0; |
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hpriv->phy_regulator = NULL; |
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} |
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if (flags & AHCI_PLATFORM_GET_RESETS) { |
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hpriv->rsts = devm_reset_control_array_get_optional_shared(dev); |
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if (IS_ERR(hpriv->rsts)) { |
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rc = PTR_ERR(hpriv->rsts); |
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goto err_out; |
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} |
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} |
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hpriv->nports = child_nodes = of_get_child_count(dev->of_node); |
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/* |
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* If no sub-node was found, we still need to set nports to |
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* one in order to be able to use the |
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* ahci_platform_[en|dis]able_[phys|regulators] functions. |
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*/ |
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if (!child_nodes) |
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hpriv->nports = 1; |
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hpriv->phys = devm_kcalloc(dev, hpriv->nports, sizeof(*hpriv->phys), GFP_KERNEL); |
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if (!hpriv->phys) { |
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rc = -ENOMEM; |
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goto err_out; |
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} |
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/* |
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* We cannot use devm_ here, since ahci_platform_put_resources() uses |
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* target_pwrs after devm_ have freed memory |
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*/ |
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hpriv->target_pwrs = kcalloc(hpriv->nports, sizeof(*hpriv->target_pwrs), GFP_KERNEL); |
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if (!hpriv->target_pwrs) { |
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rc = -ENOMEM; |
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goto err_out; |
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} |
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if (child_nodes) { |
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for_each_child_of_node(dev->of_node, child) { |
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u32 port; |
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struct platform_device *port_dev __maybe_unused; |
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|
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if (!of_device_is_available(child)) |
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continue; |
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if (of_property_read_u32(child, "reg", &port)) { |
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rc = -EINVAL; |
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of_node_put(child); |
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goto err_out; |
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} |
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if (port >= hpriv->nports) { |
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dev_warn(dev, "invalid port number %d\n", port); |
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continue; |
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} |
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mask_port_map |= BIT(port); |
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#ifdef CONFIG_OF_ADDRESS |
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of_platform_device_create(child, NULL, NULL); |
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port_dev = of_find_device_by_node(child); |
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if (port_dev) { |
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rc = ahci_platform_get_regulator(hpriv, port, |
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&port_dev->dev); |
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if (rc == -EPROBE_DEFER) { |
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of_node_put(child); |
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goto err_out; |
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} |
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} |
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#endif |
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rc = ahci_platform_get_phy(hpriv, port, dev, child); |
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if (rc) { |
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of_node_put(child); |
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goto err_out; |
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} |
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enabled_ports++; |
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} |
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if (!enabled_ports) { |
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dev_warn(dev, "No port enabled\n"); |
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rc = -ENODEV; |
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goto err_out; |
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} |
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if (!hpriv->mask_port_map) |
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hpriv->mask_port_map = mask_port_map; |
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} else { |
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/* |
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* If no sub-node was found, keep this for device tree |
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* compatibility |
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*/ |
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rc = ahci_platform_get_phy(hpriv, 0, dev, dev->of_node); |
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if (rc) |
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goto err_out; |
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rc = ahci_platform_get_regulator(hpriv, 0, dev); |
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if (rc == -EPROBE_DEFER) |
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goto err_out; |
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} |
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pm_runtime_enable(dev); |
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pm_runtime_get_sync(dev); |
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hpriv->got_runtime_pm = true; |
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devres_remove_group(dev, NULL); |
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return hpriv; |
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err_out: |
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devres_release_group(dev, NULL); |
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return ERR_PTR(rc); |
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} |
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EXPORT_SYMBOL_GPL(ahci_platform_get_resources); |
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|
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/** |
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* ahci_platform_init_host - Bring up an ahci-platform host |
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* @pdev: platform device pointer for the host |
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* @hpriv: ahci-host private data for the host |
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* @pi_template: template for the ata_port_info to use |
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* @sht: scsi_host_template to use when registering |
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* |
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* This function does all the usual steps needed to bring up an |
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* ahci-platform host, note any necessary resources (ie clks, phys, etc.) |
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* must be initialized / enabled before calling this. |
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* |
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* RETURNS: |
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* 0 on success otherwise a negative error code |
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*/ |
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int ahci_platform_init_host(struct platform_device *pdev, |
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struct ahci_host_priv *hpriv, |
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const struct ata_port_info *pi_template, |
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struct scsi_host_template *sht) |
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{ |
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struct device *dev = &pdev->dev; |
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struct ata_port_info pi = *pi_template; |
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const struct ata_port_info *ppi[] = { &pi, NULL }; |
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struct ata_host *host; |
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int i, irq, n_ports, rc; |
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|
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irq = platform_get_irq(pdev, 0); |
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if (irq < 0) { |
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if (irq != -EPROBE_DEFER) |
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dev_err(dev, "no irq\n"); |
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return irq; |
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} |
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if (!irq) |
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return -EINVAL; |
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|
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hpriv->irq = irq; |
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|
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/* prepare host */ |
|
pi.private_data = (void *)(unsigned long)hpriv->flags; |
|
|
|
ahci_save_initial_config(dev, hpriv); |
|
|
|
if (hpriv->cap & HOST_CAP_NCQ) |
|
pi.flags |= ATA_FLAG_NCQ; |
|
|
|
if (hpriv->cap & HOST_CAP_PMP) |
|
pi.flags |= ATA_FLAG_PMP; |
|
|
|
ahci_set_em_messages(hpriv, &pi); |
|
|
|
/* CAP.NP sometimes indicate the index of the last enabled |
|
* port, at other times, that of the last possible port, so |
|
* determining the maximum port number requires looking at |
|
* both CAP.NP and port_map. |
|
*/ |
|
n_ports = max(ahci_nr_ports(hpriv->cap), fls(hpriv->port_map)); |
|
|
|
host = ata_host_alloc_pinfo(dev, ppi, n_ports); |
|
if (!host) |
|
return -ENOMEM; |
|
|
|
host->private_data = hpriv; |
|
|
|
if (!(hpriv->cap & HOST_CAP_SSS) || ahci_ignore_sss) |
|
host->flags |= ATA_HOST_PARALLEL_SCAN; |
|
else |
|
dev_info(dev, "SSS flag set, parallel bus scan disabled\n"); |
|
|
|
if (pi.flags & ATA_FLAG_EM) |
|
ahci_reset_em(host); |
|
|
|
for (i = 0; i < host->n_ports; i++) { |
|
struct ata_port *ap = host->ports[i]; |
|
|
|
ata_port_desc(ap, "mmio %pR", |
|
platform_get_resource(pdev, IORESOURCE_MEM, 0)); |
|
ata_port_desc(ap, "port 0x%x", 0x100 + ap->port_no * 0x80); |
|
|
|
/* set enclosure management message type */ |
|
if (ap->flags & ATA_FLAG_EM) |
|
ap->em_message_type = hpriv->em_msg_type; |
|
|
|
/* disabled/not-implemented port */ |
|
if (!(hpriv->port_map & (1 << i))) |
|
ap->ops = &ata_dummy_port_ops; |
|
} |
|
|
|
if (hpriv->cap & HOST_CAP_64) { |
|
rc = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(64)); |
|
if (rc) { |
|
rc = dma_coerce_mask_and_coherent(dev, |
|
DMA_BIT_MASK(32)); |
|
if (rc) { |
|
dev_err(dev, "Failed to enable 64-bit DMA.\n"); |
|
return rc; |
|
} |
|
dev_warn(dev, "Enable 32-bit DMA instead of 64-bit.\n"); |
|
} |
|
} |
|
|
|
rc = ahci_reset_controller(host); |
|
if (rc) |
|
return rc; |
|
|
|
ahci_init_controller(host); |
|
ahci_print_info(host, "platform"); |
|
|
|
return ahci_host_activate(host, sht); |
|
} |
|
EXPORT_SYMBOL_GPL(ahci_platform_init_host); |
|
|
|
static void ahci_host_stop(struct ata_host *host) |
|
{ |
|
struct ahci_host_priv *hpriv = host->private_data; |
|
|
|
ahci_platform_disable_resources(hpriv); |
|
} |
|
|
|
/** |
|
* ahci_platform_shutdown - Disable interrupts and stop DMA for host ports |
|
* @pdev: platform device pointer for the host |
|
* |
|
* This function is called during system shutdown and performs the minimal |
|
* deconfiguration required to ensure that an ahci_platform host cannot |
|
* corrupt or otherwise interfere with a new kernel being started with kexec. |
|
*/ |
|
void ahci_platform_shutdown(struct platform_device *pdev) |
|
{ |
|
struct ata_host *host = platform_get_drvdata(pdev); |
|
struct ahci_host_priv *hpriv = host->private_data; |
|
void __iomem *mmio = hpriv->mmio; |
|
int i; |
|
|
|
for (i = 0; i < host->n_ports; i++) { |
|
struct ata_port *ap = host->ports[i]; |
|
|
|
/* Disable port interrupts */ |
|
if (ap->ops->freeze) |
|
ap->ops->freeze(ap); |
|
|
|
/* Stop the port DMA engines */ |
|
if (ap->ops->port_stop) |
|
ap->ops->port_stop(ap); |
|
} |
|
|
|
/* Disable and clear host interrupts */ |
|
writel(readl(mmio + HOST_CTL) & ~HOST_IRQ_EN, mmio + HOST_CTL); |
|
readl(mmio + HOST_CTL); /* flush */ |
|
writel(GENMASK(host->n_ports, 0), mmio + HOST_IRQ_STAT); |
|
} |
|
EXPORT_SYMBOL_GPL(ahci_platform_shutdown); |
|
|
|
#ifdef CONFIG_PM_SLEEP |
|
/** |
|
* ahci_platform_suspend_host - Suspend an ahci-platform host |
|
* @dev: device pointer for the host |
|
* |
|
* This function does all the usual steps needed to suspend an |
|
* ahci-platform host, note any necessary resources (ie clks, phys, etc.) |
|
* must be disabled after calling this. |
|
* |
|
* RETURNS: |
|
* 0 on success otherwise a negative error code |
|
*/ |
|
int ahci_platform_suspend_host(struct device *dev) |
|
{ |
|
struct ata_host *host = dev_get_drvdata(dev); |
|
struct ahci_host_priv *hpriv = host->private_data; |
|
void __iomem *mmio = hpriv->mmio; |
|
u32 ctl; |
|
|
|
if (hpriv->flags & AHCI_HFLAG_NO_SUSPEND) { |
|
dev_err(dev, "firmware update required for suspend/resume\n"); |
|
return -EIO; |
|
} |
|
|
|
/* |
|
* AHCI spec rev1.1 section 8.3.3: |
|
* Software must disable interrupts prior to requesting a |
|
* transition of the HBA to D3 state. |
|
*/ |
|
ctl = readl(mmio + HOST_CTL); |
|
ctl &= ~HOST_IRQ_EN; |
|
writel(ctl, mmio + HOST_CTL); |
|
readl(mmio + HOST_CTL); /* flush */ |
|
|
|
if (hpriv->flags & AHCI_HFLAG_SUSPEND_PHYS) |
|
ahci_platform_disable_phys(hpriv); |
|
|
|
return ata_host_suspend(host, PMSG_SUSPEND); |
|
} |
|
EXPORT_SYMBOL_GPL(ahci_platform_suspend_host); |
|
|
|
/** |
|
* ahci_platform_resume_host - Resume an ahci-platform host |
|
* @dev: device pointer for the host |
|
* |
|
* This function does all the usual steps needed to resume an ahci-platform |
|
* host, note any necessary resources (ie clks, phys, etc.) must be |
|
* initialized / enabled before calling this. |
|
* |
|
* RETURNS: |
|
* 0 on success otherwise a negative error code |
|
*/ |
|
int ahci_platform_resume_host(struct device *dev) |
|
{ |
|
struct ata_host *host = dev_get_drvdata(dev); |
|
struct ahci_host_priv *hpriv = host->private_data; |
|
int rc; |
|
|
|
if (dev->power.power_state.event == PM_EVENT_SUSPEND) { |
|
rc = ahci_reset_controller(host); |
|
if (rc) |
|
return rc; |
|
|
|
ahci_init_controller(host); |
|
} |
|
|
|
if (hpriv->flags & AHCI_HFLAG_SUSPEND_PHYS) |
|
ahci_platform_enable_phys(hpriv); |
|
|
|
ata_host_resume(host); |
|
|
|
return 0; |
|
} |
|
EXPORT_SYMBOL_GPL(ahci_platform_resume_host); |
|
|
|
/** |
|
* ahci_platform_suspend - Suspend an ahci-platform device |
|
* @dev: the platform device to suspend |
|
* |
|
* This function suspends the host associated with the device, followed by |
|
* disabling all the resources of the device. |
|
* |
|
* RETURNS: |
|
* 0 on success otherwise a negative error code |
|
*/ |
|
int ahci_platform_suspend(struct device *dev) |
|
{ |
|
struct ata_host *host = dev_get_drvdata(dev); |
|
struct ahci_host_priv *hpriv = host->private_data; |
|
int rc; |
|
|
|
rc = ahci_platform_suspend_host(dev); |
|
if (rc) |
|
return rc; |
|
|
|
ahci_platform_disable_resources(hpriv); |
|
|
|
return 0; |
|
} |
|
EXPORT_SYMBOL_GPL(ahci_platform_suspend); |
|
|
|
/** |
|
* ahci_platform_resume - Resume an ahci-platform device |
|
* @dev: the platform device to resume |
|
* |
|
* This function enables all the resources of the device followed by |
|
* resuming the host associated with the device. |
|
* |
|
* RETURNS: |
|
* 0 on success otherwise a negative error code |
|
*/ |
|
int ahci_platform_resume(struct device *dev) |
|
{ |
|
struct ata_host *host = dev_get_drvdata(dev); |
|
struct ahci_host_priv *hpriv = host->private_data; |
|
int rc; |
|
|
|
rc = ahci_platform_enable_resources(hpriv); |
|
if (rc) |
|
return rc; |
|
|
|
rc = ahci_platform_resume_host(dev); |
|
if (rc) |
|
goto disable_resources; |
|
|
|
/* We resumed so update PM runtime state */ |
|
pm_runtime_disable(dev); |
|
pm_runtime_set_active(dev); |
|
pm_runtime_enable(dev); |
|
|
|
return 0; |
|
|
|
disable_resources: |
|
ahci_platform_disable_resources(hpriv); |
|
|
|
return rc; |
|
} |
|
EXPORT_SYMBOL_GPL(ahci_platform_resume); |
|
#endif |
|
|
|
MODULE_DESCRIPTION("AHCI SATA platform library"); |
|
MODULE_AUTHOR("Anton Vorontsov <[email protected]>"); |
|
MODULE_LICENSE("GPL");
|
|
|