Techwizz/kernel-fxtec-pro1x
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity
kernel-fxtec-pro1x/drivers/ata/pata_artop.c
Colin Ian King 01bb12e49b ata: pata_artop: remove redundant initialization of pio 
pio is initialized and the data is never read, instead it is almost
immediately being updated to a new value. Fix this by removing the
initialization.

Detected by scan-build:
"warning: Value stored to 'pio' during its initialization is never read"

Fixes: 669a5db411 ("[libata] Add a bunch of PATA drivers")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
2017-09-18 20:24:21 -07:00

459 lines
12 KiB
C
Raw Blame History

/*
* pata_artop.c - ARTOP ATA controller driver
*
* (C) 2006 Red Hat
* (C) 2007,2011 Bartlomiej Zolnierkiewicz
*
* Based in part on drivers/ide/pci/aec62xx.c
* Copyright (C) 1999-2002 Andre Hedrick <andre@linux-ide.org>
* 865/865R fixes for Macintosh card version from a patch to the old
* driver by Thibaut VARENE <varenet@parisc-linux.org>
* When setting the PCI latency we must set 0x80 or higher for burst
* performance Alessandro Zummo <alessandro.zummo@towertech.it>
*
* TODO
* Investigate no_dsc on 850R
* Clock detect
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/blkdev.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <scsi/scsi_host.h>
#include <linux/libata.h>
#include <linux/ata.h>
#define DRV_NAME "pata_artop"
#define DRV_VERSION "0.4.6"
/*
* The ARTOP has 33 Mhz and "over clocked" timing tables. Until we
* get PCI bus speed functionality we leave this as 0. Its a variable
* for when we get the functionality and also for folks wanting to
* test stuff.
*/
static int clock = 0;
/**
* artop62x0_pre_reset - probe begin
* @link: link
* @deadline: deadline jiffies for the operation
*
* Nothing complicated needed here.
*/
static int artop62x0_pre_reset(struct ata_link *link, unsigned long deadline)
{
static const struct pci_bits artop_enable_bits[] = {
{ 0x4AU, 1U, 0x02UL, 0x02UL }, /* port 0 */
{ 0x4AU, 1U, 0x04UL, 0x04UL }, /* port 1 */
};
struct ata_port *ap = link->ap;
struct pci_dev *pdev = to_pci_dev(ap->host->dev);
/* Odd numbered device ids are the units with enable bits. */
if ((pdev->device & 1) &&
!pci_test_config_bits(pdev, &artop_enable_bits[ap->port_no]))
return -ENOENT;
return ata_sff_prereset(link, deadline);
}
/**
* artop6260_cable_detect - identify cable type
* @ap: Port
*
* Identify the cable type for the ARTOP interface in question
*/
static int artop6260_cable_detect(struct ata_port *ap)
{
struct pci_dev *pdev = to_pci_dev(ap->host->dev);
u8 tmp;
pci_read_config_byte(pdev, 0x49, &tmp);
if (tmp & (1 << ap->port_no))
return ATA_CBL_PATA40;
return ATA_CBL_PATA80;
}
/**
* artop6210_load_piomode - Load a set of PATA PIO timings
* @ap: Port whose timings we are configuring
* @adev: Device
* @pio: PIO mode
*
* Set PIO mode for device, in host controller PCI config space. This
* is used both to set PIO timings in PIO mode and also to set the
* matching PIO clocking for UDMA, as well as the MWDMA timings.
*
* LOCKING:
* None (inherited from caller).
*/
static void artop6210_load_piomode(struct ata_port *ap, struct ata_device *adev, unsigned int pio)
{
struct pci_dev *pdev = to_pci_dev(ap->host->dev);
int dn = adev->devno + 2 * ap->port_no;
const u16 timing[2][5] = {
{ 0x0000, 0x000A, 0x0008, 0x0303, 0x0301 },
{ 0x0700, 0x070A, 0x0708, 0x0403, 0x0401 }
};
/* Load the PIO timing active/recovery bits */
pci_write_config_word(pdev, 0x40 + 2 * dn, timing[clock][pio]);
}
/**
* artop6210_set_piomode - Initialize host controller PATA PIO timings
* @ap: Port whose timings we are configuring
* @adev: Device we are configuring
*
* Set PIO mode for device, in host controller PCI config space. For
* ARTOP we must also clear the UDMA bits if we are not doing UDMA. In
* the event UDMA is used the later call to set_dmamode will set the
* bits as required.
*
* LOCKING:
* None (inherited from caller).
*/
static void artop6210_set_piomode(struct ata_port *ap, struct ata_device *adev)
{
struct pci_dev *pdev = to_pci_dev(ap->host->dev);
int dn = adev->devno + 2 * ap->port_no;
u8 ultra;
artop6210_load_piomode(ap, adev, adev->pio_mode - XFER_PIO_0);
/* Clear the UDMA mode bits (set_dmamode will redo this if needed) */
pci_read_config_byte(pdev, 0x54, &ultra);
ultra &= ~(3 << (2 * dn));
pci_write_config_byte(pdev, 0x54, ultra);
}
/**
* artop6260_load_piomode - Initialize host controller PATA PIO timings
* @ap: Port whose timings we are configuring
* @adev: Device we are configuring
* @pio: PIO mode
*
* Set PIO mode for device, in host controller PCI config space. The
* ARTOP6260 and relatives store the timing data differently.
*
* LOCKING:
* None (inherited from caller).
*/
static void artop6260_load_piomode (struct ata_port *ap, struct ata_device *adev, unsigned int pio)
{
struct pci_dev *pdev = to_pci_dev(ap->host->dev);
int dn = adev->devno + 2 * ap->port_no;
const u8 timing[2][5] = {
{ 0x00, 0x0A, 0x08, 0x33, 0x31 },
{ 0x70, 0x7A, 0x78, 0x43, 0x41 }
};
/* Load the PIO timing active/recovery bits */
pci_write_config_byte(pdev, 0x40 + dn, timing[clock][pio]);
}
/**
* artop6260_set_piomode - Initialize host controller PATA PIO timings
* @ap: Port whose timings we are configuring
* @adev: Device we are configuring
*
* Set PIO mode for device, in host controller PCI config space. For
* ARTOP we must also clear the UDMA bits if we are not doing UDMA. In
* the event UDMA is used the later call to set_dmamode will set the
* bits as required.
*
* LOCKING:
* None (inherited from caller).
*/
static void artop6260_set_piomode(struct ata_port *ap, struct ata_device *adev)
{
struct pci_dev *pdev = to_pci_dev(ap->host->dev);
u8 ultra;
artop6260_load_piomode(ap, adev, adev->pio_mode - XFER_PIO_0);
/* Clear the UDMA mode bits (set_dmamode will redo this if needed) */
pci_read_config_byte(pdev, 0x44 + ap->port_no, &ultra);
ultra &= ~(7 << (4 * adev->devno)); /* One nibble per drive */
pci_write_config_byte(pdev, 0x44 + ap->port_no, ultra);
}
/**
* artop6210_set_dmamode - Initialize host controller PATA PIO timings
* @ap: Port whose timings we are configuring
* @adev: Device whose timings we are configuring
*
* Set DMA mode for device, in host controller PCI config space.
*
* LOCKING:
* None (inherited from caller).
*/
static void artop6210_set_dmamode (struct ata_port *ap, struct ata_device *adev)
{
unsigned int pio;
struct pci_dev *pdev = to_pci_dev(ap->host->dev);
int dn = adev->devno + 2 * ap->port_no;
u8 ultra;
if (adev->dma_mode == XFER_MW_DMA_0)
pio = 1;
else
pio = 4;
/* Load the PIO timing active/recovery bits */
artop6210_load_piomode(ap, adev, pio);
pci_read_config_byte(pdev, 0x54, &ultra);
ultra &= ~(3 << (2 * dn));
/* Add ultra DMA bits if in UDMA mode */
if (adev->dma_mode >= XFER_UDMA_0) {
u8 mode = (adev->dma_mode - XFER_UDMA_0) + 1 - clock;
if (mode == 0)
mode = 1;
ultra |= (mode << (2 * dn));
}
pci_write_config_byte(pdev, 0x54, ultra);
}
/**
* artop6260_set_dmamode - Initialize host controller PATA PIO timings
* @ap: Port whose timings we are configuring
* @adev: Device we are configuring
*
* Set DMA mode for device, in host controller PCI config space. The
* ARTOP6260 and relatives store the timing data differently.
*
* LOCKING:
* None (inherited from caller).
*/
static void artop6260_set_dmamode (struct ata_port *ap, struct ata_device *adev)
{
unsigned int pio;
struct pci_dev *pdev = to_pci_dev(ap->host->dev);
u8 ultra;
if (adev->dma_mode == XFER_MW_DMA_0)
pio = 1;
else
pio = 4;
/* Load the PIO timing active/recovery bits */
artop6260_load_piomode(ap, adev, pio);
/* Add ultra DMA bits if in UDMA mode */
pci_read_config_byte(pdev, 0x44 + ap->port_no, &ultra);
ultra &= ~(7 << (4 * adev->devno)); /* One nibble per drive */
if (adev->dma_mode >= XFER_UDMA_0) {
u8 mode = adev->dma_mode - XFER_UDMA_0 + 1 - clock;
if (mode == 0)
mode = 1;
ultra |= (mode << (4 * adev->devno));
}
pci_write_config_byte(pdev, 0x44 + ap->port_no, ultra);
}
/**
* artop_6210_qc_defer - implement serialization
* @qc: command
*
* Issue commands per host on this chip.
*/
static int artop6210_qc_defer(struct ata_queued_cmd *qc)
{
struct ata_host *host = qc->ap->host;
struct ata_port *alt = host->ports[1 ^ qc->ap->port_no];
int rc;
/* First apply the usual rules */
rc = ata_std_qc_defer(qc);
if (rc != 0)
return rc;
/* Now apply serialization rules. Only allow a command if the
other channel state machine is idle */
if (alt && alt->qc_active)
return ATA_DEFER_PORT;
return 0;
}
static struct scsi_host_template artop_sht = {
ATA_BMDMA_SHT(DRV_NAME),
};
static struct ata_port_operations artop6210_ops = {
.inherits = &ata_bmdma_port_ops,
.cable_detect = ata_cable_40wire,
.set_piomode = artop6210_set_piomode,
.set_dmamode = artop6210_set_dmamode,
.prereset = artop62x0_pre_reset,
.qc_defer = artop6210_qc_defer,
};
static struct ata_port_operations artop6260_ops = {
.inherits = &ata_bmdma_port_ops,
.cable_detect = artop6260_cable_detect,
.set_piomode = artop6260_set_piomode,
.set_dmamode = artop6260_set_dmamode,
.prereset = artop62x0_pre_reset,
};
static void atp8xx_fixup(struct pci_dev *pdev)
{
if (pdev->device == 0x0005)
/* BIOS may have left us in UDMA, clear it before libata probe */
pci_write_config_byte(pdev, 0x54, 0);
else if (pdev->device == 0x0008 || pdev->device == 0x0009) {
u8 reg;
/* Mac systems come up with some registers not set as we
will need them */
/* Clear reset & test bits */
pci_read_config_byte(pdev, 0x49, &reg);
pci_write_config_byte(pdev, 0x49, reg & ~0x30);
/* PCI latency must be > 0x80 for burst mode, tweak it
* if required.
*/
pci_read_config_byte(pdev, PCI_LATENCY_TIMER, &reg);
if (reg <= 0x80)
pci_write_config_byte(pdev, PCI_LATENCY_TIMER, 0x90);
/* Enable IRQ output and burst mode */
pci_read_config_byte(pdev, 0x4a, &reg);
pci_write_config_byte(pdev, 0x4a, (reg & ~0x01) | 0x80);
}
}
/**
* artop_init_one - Register ARTOP ATA PCI device with kernel services
* @pdev: PCI device to register
* @ent: Entry in artop_pci_tbl matching with @pdev
*
* Called from kernel PCI layer.
*
* LOCKING:
* Inherited from PCI layer (may sleep).
*
* RETURNS:
* Zero on success, or -ERRNO value.
*/
static int artop_init_one (struct pci_dev *pdev, const struct pci_device_id *id)
{
static const struct ata_port_info info_6210 = {
.flags = ATA_FLAG_SLAVE_POSS,
.pio_mask = ATA_PIO4,
.mwdma_mask = ATA_MWDMA2,
.udma_mask = ATA_UDMA2,
.port_ops = &artop6210_ops,
};
static const struct ata_port_info info_626x = {
.flags = ATA_FLAG_SLAVE_POSS,
.pio_mask = ATA_PIO4,
.mwdma_mask = ATA_MWDMA2,
.udma_mask = ATA_UDMA4,
.port_ops = &artop6260_ops,
};
static const struct ata_port_info info_628x = {
.flags = ATA_FLAG_SLAVE_POSS,
.pio_mask = ATA_PIO4,
.mwdma_mask = ATA_MWDMA2,
.udma_mask = ATA_UDMA5,
.port_ops = &artop6260_ops,
};
static const struct ata_port_info info_628x_fast = {
.flags = ATA_FLAG_SLAVE_POSS,
.pio_mask = ATA_PIO4,
.mwdma_mask = ATA_MWDMA2,
.udma_mask = ATA_UDMA6,
.port_ops = &artop6260_ops,
};
const struct ata_port_info *ppi[] = { NULL, NULL };
int rc;
ata_print_version_once(&pdev->dev, DRV_VERSION);
rc = pcim_enable_device(pdev);
if (rc)
return rc;
if (id->driver_data == 0) /* 6210 variant */
ppi[0] = &info_6210;
else if (id->driver_data == 1) /* 6260 */
ppi[0] = &info_626x;
else if (id->driver_data == 2) { /* 6280 or 6280 + fast */
unsigned long io = pci_resource_start(pdev, 4);
ppi[0] = &info_628x;
if (inb(io) & 0x10)
ppi[0] = &info_628x_fast;
}
BUG_ON(ppi[0] == NULL);
atp8xx_fixup(pdev);
return ata_pci_bmdma_init_one(pdev, ppi, &artop_sht, NULL, 0);
}
static const struct pci_device_id artop_pci_tbl[] = {
{ PCI_VDEVICE(ARTOP, 0x0005), 0 },
{ PCI_VDEVICE(ARTOP, 0x0006), 1 },
{ PCI_VDEVICE(ARTOP, 0x0007), 1 },
{ PCI_VDEVICE(ARTOP, 0x0008), 2 },
{ PCI_VDEVICE(ARTOP, 0x0009), 2 },
{ } /* terminate list */
};
#ifdef CONFIG_PM_SLEEP
static int atp8xx_reinit_one(struct pci_dev *pdev)
{
struct ata_host *host = pci_get_drvdata(pdev);
int rc;
rc = ata_pci_device_do_resume(pdev);
if (rc)
return rc;
atp8xx_fixup(pdev);
ata_host_resume(host);
return 0;
}
#endif
static struct pci_driver artop_pci_driver = {
.name = DRV_NAME,
.id_table = artop_pci_tbl,
.probe = artop_init_one,
.remove = ata_pci_remove_one,
#ifdef CONFIG_PM_SLEEP
.suspend = ata_pci_device_suspend,
.resume = atp8xx_reinit_one,
#endif
};
module_pci_driver(artop_pci_driver);
MODULE_AUTHOR("Alan Cox, Bartlomiej Zolnierkiewicz");
MODULE_DESCRIPTION("SCSI low-level driver for ARTOP PATA");
MODULE_LICENSE("GPL");
MODULE_DEVICE_TABLE(pci, artop_pci_tbl);
MODULE_VERSION(DRV_VERSION);
Reference in a new issue View git blame Copy permalink