forked from Minki/linux
211 lines
5.3 KiB
C
211 lines
5.3 KiB
C
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/*
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* Universal Flash Storage Host controller PCI glue driver
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*
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* This code is based on drivers/scsi/ufs/ufshcd-pci.c
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* Copyright (C) 2011-2013 Samsung India Software Operations
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*
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* Authors:
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* Santosh Yaraganavi <santosh.sy@samsung.com>
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* Vinayak Holikatti <h.vinayak@samsung.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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* See the COPYING file in the top-level directory or visit
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* <http://www.gnu.org/licenses/gpl-2.0.html>
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* This program is provided "AS IS" and "WITH ALL FAULTS" and
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* without warranty of any kind. You are solely responsible for
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* determining the appropriateness of using and distributing
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* the program and assume all risks associated with your exercise
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* of rights with respect to the program, including but not limited
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* to infringement of third party rights, the risks and costs of
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* program errors, damage to or loss of data, programs or equipment,
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* and unavailability or interruption of operations. Under no
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* circumstances will the contributor of this Program be liable for
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* any damages of any kind arising from your use or distribution of
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* this program.
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*/
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#include "ufshcd.h"
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#include <linux/pci.h>
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#ifdef CONFIG_PM
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/**
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* ufshcd_pci_suspend - suspend power management function
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* @pdev: pointer to PCI device handle
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* @state: power state
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*
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* Returns -ENOSYS
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*/
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static int ufshcd_pci_suspend(struct pci_dev *pdev, pm_message_t state)
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{
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/*
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* TODO:
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* 1. Call ufshcd_suspend
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* 2. Do bus specific power management
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*/
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return -ENOSYS;
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}
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/**
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* ufshcd_pci_resume - resume power management function
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* @pdev: pointer to PCI device handle
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*
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* Returns -ENOSYS
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*/
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static int ufshcd_pci_resume(struct pci_dev *pdev)
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{
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/*
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* TODO:
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* 1. Call ufshcd_resume.
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* 2. Do bus specific wake up
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*/
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return -ENOSYS;
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}
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#endif /* CONFIG_PM */
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/**
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* ufshcd_pci_shutdown - main function to put the controller in reset state
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* @pdev: pointer to PCI device handle
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*/
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static void ufshcd_pci_shutdown(struct pci_dev *pdev)
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{
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ufshcd_hba_stop((struct ufs_hba *)pci_get_drvdata(pdev));
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}
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/**
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* ufshcd_pci_remove - de-allocate PCI/SCSI host and host memory space
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* data structure memory
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* @pdev - pointer to PCI handle
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*/
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static void ufshcd_pci_remove(struct pci_dev *pdev)
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{
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struct ufs_hba *hba = pci_get_drvdata(pdev);
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disable_irq(pdev->irq);
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ufshcd_remove(hba);
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pci_release_regions(pdev);
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pci_set_drvdata(pdev, NULL);
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pci_clear_master(pdev);
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pci_disable_device(pdev);
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}
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/**
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* ufshcd_set_dma_mask - Set dma mask based on the controller
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* addressing capability
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* @pdev: PCI device structure
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*
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* Returns 0 for success, non-zero for failure
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*/
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static int ufshcd_set_dma_mask(struct pci_dev *pdev)
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{
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int err;
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if (!pci_set_dma_mask(pdev, DMA_BIT_MASK(64))
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&& !pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64)))
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return 0;
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err = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
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if (!err)
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err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
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return err;
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}
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/**
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* ufshcd_pci_probe - probe routine of the driver
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* @pdev: pointer to PCI device handle
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* @id: PCI device id
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*
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* Returns 0 on success, non-zero value on failure
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*/
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static int
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ufshcd_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
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{
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struct ufs_hba *hba;
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void __iomem *mmio_base;
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int err;
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err = pci_enable_device(pdev);
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if (err) {
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dev_err(&pdev->dev, "pci_enable_device failed\n");
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goto out_error;
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}
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pci_set_master(pdev);
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err = pci_request_regions(pdev, UFSHCD);
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if (err < 0) {
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dev_err(&pdev->dev, "request regions failed\n");
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goto out_disable;
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}
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mmio_base = pci_ioremap_bar(pdev, 0);
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if (!mmio_base) {
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dev_err(&pdev->dev, "memory map failed\n");
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err = -ENOMEM;
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goto out_release_regions;
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}
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err = ufshcd_set_dma_mask(pdev);
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if (err) {
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dev_err(&pdev->dev, "set dma mask failed\n");
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goto out_iounmap;
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}
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err = ufshcd_init(&pdev->dev, &hba, mmio_base, pdev->irq);
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if (err) {
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dev_err(&pdev->dev, "Initialization failed\n");
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goto out_iounmap;
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}
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pci_set_drvdata(pdev, hba);
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return 0;
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out_iounmap:
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iounmap(mmio_base);
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out_release_regions:
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pci_release_regions(pdev);
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out_disable:
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pci_clear_master(pdev);
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pci_disable_device(pdev);
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out_error:
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return err;
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}
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static DEFINE_PCI_DEVICE_TABLE(ufshcd_pci_tbl) = {
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{ PCI_VENDOR_ID_SAMSUNG, 0xC00C, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0 },
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{ } /* terminate list */
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};
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MODULE_DEVICE_TABLE(pci, ufshcd_pci_tbl);
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static struct pci_driver ufshcd_pci_driver = {
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.name = UFSHCD,
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.id_table = ufshcd_pci_tbl,
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.probe = ufshcd_pci_probe,
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.remove = ufshcd_pci_remove,
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.shutdown = ufshcd_pci_shutdown,
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#ifdef CONFIG_PM
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.suspend = ufshcd_pci_suspend,
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.resume = ufshcd_pci_resume,
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#endif
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};
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module_pci_driver(ufshcd_pci_driver);
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MODULE_AUTHOR("Santosh Yaragnavi <santosh.sy@samsung.com>");
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MODULE_AUTHOR("Vinayak Holikatti <h.vinayak@samsung.com>");
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MODULE_DESCRIPTION("UFS host controller PCI glue driver");
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MODULE_LICENSE("GPL");
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MODULE_VERSION(UFSHCD_DRIVER_VERSION);
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