cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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pata_marvell.c (4242B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 *	Marvell PATA driver.
      4 *
      5 *	For the moment we drive the PATA port in legacy mode. That
      6 *	isn't making full use of the device functionality but it is
      7 *	easy to get working.
      8 *
      9 *	(c) 2006 Red Hat
     10 */
     11
     12#include <linux/kernel.h>
     13#include <linux/module.h>
     14#include <linux/pci.h>
     15#include <linux/blkdev.h>
     16#include <linux/delay.h>
     17#include <linux/device.h>
     18#include <scsi/scsi_host.h>
     19#include <linux/libata.h>
     20#include <linux/ata.h>
     21
     22#define DRV_NAME	"pata_marvell"
     23#define DRV_VERSION	"0.1.6"
     24
     25/**
     26 *	marvell_pata_active	-	check if PATA is active
     27 *	@pdev: PCI device
     28 *
     29 *	Returns 1 if the PATA port may be active. We know how to check this
     30 *	for the 6145 but not the other devices
     31 */
     32
     33static int marvell_pata_active(struct pci_dev *pdev)
     34{
     35	u32 devices;
     36	void __iomem *barp;
     37
     38	/* We don't yet know how to do this for other devices */
     39	if (pdev->device != 0x6145)
     40		return 1;
     41
     42	barp = pci_iomap(pdev, 5, 0x10);
     43	if (barp == NULL)
     44		return -ENOMEM;
     45
     46	devices = ioread32(barp + 0x0C);
     47	pci_iounmap(pdev, barp);
     48
     49	if (devices & 0x10)
     50		return 1;
     51	return 0;
     52}
     53
     54/**
     55 *	marvell_pre_reset	-	probe begin
     56 *	@link: link
     57 *	@deadline: deadline jiffies for the operation
     58 *
     59 *	Perform the PATA port setup we need.
     60 */
     61
     62static int marvell_pre_reset(struct ata_link *link, unsigned long deadline)
     63{
     64	struct ata_port *ap = link->ap;
     65	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
     66
     67	if (pdev->device == 0x6145 && ap->port_no == 0 &&
     68		!marvell_pata_active(pdev))	/* PATA enable ? */
     69			return -ENOENT;
     70
     71	return ata_sff_prereset(link, deadline);
     72}
     73
     74static int marvell_cable_detect(struct ata_port *ap)
     75{
     76	/* Cable type */
     77	switch(ap->port_no)
     78	{
     79	case 0:
     80		if (!ap->ioaddr.bmdma_addr)
     81			return ATA_CBL_PATA_UNK;
     82		if (ioread8(ap->ioaddr.bmdma_addr + 1) & 1)
     83			return ATA_CBL_PATA40;
     84		return ATA_CBL_PATA80;
     85	case 1: /* Legacy SATA port */
     86		return ATA_CBL_SATA;
     87	}
     88
     89	BUG();
     90	return 0;	/* Our BUG macro needs the right markup */
     91}
     92
     93/* No PIO or DMA methods needed for this device */
     94
     95static struct scsi_host_template marvell_sht = {
     96	ATA_BMDMA_SHT(DRV_NAME),
     97};
     98
     99static struct ata_port_operations marvell_ops = {
    100	.inherits		= &ata_bmdma_port_ops,
    101	.cable_detect		= marvell_cable_detect,
    102	.prereset		= marvell_pre_reset,
    103};
    104
    105
    106/**
    107 *	marvell_init_one - Register Marvell ATA PCI device with kernel services
    108 *	@pdev: PCI device to register
    109 *	@id: PCI device ID
    110 *
    111 *	Called from kernel PCI layer.
    112 *
    113 *	LOCKING:
    114 *	Inherited from PCI layer (may sleep).
    115 *
    116 *	RETURNS:
    117 *	Zero on success, or -ERRNO value.
    118 */
    119
    120static int marvell_init_one (struct pci_dev *pdev, const struct pci_device_id *id)
    121{
    122	static const struct ata_port_info info = {
    123		.flags		= ATA_FLAG_SLAVE_POSS,
    124
    125		.pio_mask	= ATA_PIO4,
    126		.mwdma_mask	= ATA_MWDMA2,
    127		.udma_mask 	= ATA_UDMA5,
    128
    129		.port_ops	= &marvell_ops,
    130	};
    131	static const struct ata_port_info info_sata = {
    132		/* Slave possible as its magically mapped not real */
    133		.flags		= ATA_FLAG_SLAVE_POSS,
    134
    135		.pio_mask	= ATA_PIO4,
    136		.mwdma_mask	= ATA_MWDMA2,
    137		.udma_mask 	= ATA_UDMA6,
    138
    139		.port_ops	= &marvell_ops,
    140	};
    141	const struct ata_port_info *ppi[] = { &info, &info_sata };
    142
    143	if (pdev->device == 0x6101)
    144		ppi[1] = &ata_dummy_port_info;
    145
    146#if IS_ENABLED(CONFIG_SATA_AHCI)
    147	if (!marvell_pata_active(pdev)) {
    148		dev_info(&pdev->dev,
    149			 "PATA port not active, deferring to AHCI driver.\n");
    150		return -ENODEV;
    151	}
    152#endif
    153	return ata_pci_bmdma_init_one(pdev, ppi, &marvell_sht, NULL, 0);
    154}
    155
    156static const struct pci_device_id marvell_pci_tbl[] = {
    157	{ PCI_DEVICE(0x11AB, 0x6101), },
    158	{ PCI_DEVICE(0x11AB, 0x6121), },
    159	{ PCI_DEVICE(0x11AB, 0x6123), },
    160	{ PCI_DEVICE(0x11AB, 0x6145), },
    161	{ PCI_DEVICE(0x1B4B, 0x91A0), },
    162	{ PCI_DEVICE(0x1B4B, 0x91A4), },
    163
    164	{ }	/* terminate list */
    165};
    166
    167static struct pci_driver marvell_pci_driver = {
    168	.name			= DRV_NAME,
    169	.id_table		= marvell_pci_tbl,
    170	.probe			= marvell_init_one,
    171	.remove			= ata_pci_remove_one,
    172#ifdef CONFIG_PM_SLEEP
    173	.suspend		= ata_pci_device_suspend,
    174	.resume			= ata_pci_device_resume,
    175#endif
    176};
    177
    178module_pci_driver(marvell_pci_driver);
    179
    180MODULE_AUTHOR("Alan Cox");
    181MODULE_DESCRIPTION("SCSI low-level driver for Marvell ATA in legacy mode");
    182MODULE_LICENSE("GPL");
    183MODULE_DEVICE_TABLE(pci, marvell_pci_tbl);
    184MODULE_VERSION(DRV_VERSION);