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pata_scc.c
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pata_scc.c
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/*
* Support for IDE interfaces on Celleb platform
*
* (C) Copyright 2006 TOSHIBA CORPORATION
*
* This code is based on drivers/ata/ata_piix.c:
* Copyright 2003-2005 Red Hat Inc
* Copyright 2003-2005 Jeff Garzik
* Copyright (C) 1998-1999 Andrzej Krzysztofowicz, Author and Maintainer
* Copyright (C) 1998-2000 Andre Hedrick <[email protected]>
* Copyright (C) 2003 Red Hat Inc <[email protected]>
*
* and drivers/ata/ahci.c:
* Copyright 2004-2005 Red Hat, Inc.
*
* and drivers/ata/libata-core.c:
* Copyright 2003-2004 Red Hat, Inc. All rights reserved.
* Copyright 2003-2004 Jeff Garzik
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/blkdev.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <scsi/scsi_host.h>
#include <linux/libata.h>
#define DRV_NAME "pata_scc"
#define DRV_VERSION "0.2"
#define PCI_DEVICE_ID_TOSHIBA_SCC_ATA 0x01b4
/* PCI BARs */
#define SCC_CTRL_BAR 0
#define SCC_BMID_BAR 1
/* offset of CTRL registers */
#define SCC_CTL_PIOSHT 0x000
#define SCC_CTL_PIOCT 0x004
#define SCC_CTL_MDMACT 0x008
#define SCC_CTL_MCRCST 0x00C
#define SCC_CTL_SDMACT 0x010
#define SCC_CTL_SCRCST 0x014
#define SCC_CTL_UDENVT 0x018
#define SCC_CTL_TDVHSEL 0x020
#define SCC_CTL_MODEREG 0x024
#define SCC_CTL_ECMODE 0xF00
#define SCC_CTL_MAEA0 0xF50
#define SCC_CTL_MAEC0 0xF54
#define SCC_CTL_CCKCTRL 0xFF0
/* offset of BMID registers */
#define SCC_DMA_CMD 0x000
#define SCC_DMA_STATUS 0x004
#define SCC_DMA_TABLE_OFS 0x008
#define SCC_DMA_INTMASK 0x010
#define SCC_DMA_INTST 0x014
#define SCC_DMA_PTERADD 0x018
#define SCC_REG_CMD_ADDR 0x020
#define SCC_REG_DATA 0x000
#define SCC_REG_ERR 0x004
#define SCC_REG_FEATURE 0x004
#define SCC_REG_NSECT 0x008
#define SCC_REG_LBAL 0x00C
#define SCC_REG_LBAM 0x010
#define SCC_REG_LBAH 0x014
#define SCC_REG_DEVICE 0x018
#define SCC_REG_STATUS 0x01C
#define SCC_REG_CMD 0x01C
#define SCC_REG_ALTSTATUS 0x020
/* register value */
#define TDVHSEL_MASTER 0x00000001
#define TDVHSEL_SLAVE 0x00000004
#define MODE_JCUSFEN 0x00000080
#define ECMODE_VALUE 0x01
#define CCKCTRL_ATARESET 0x00040000
#define CCKCTRL_BUFCNT 0x00020000
#define CCKCTRL_CRST 0x00010000
#define CCKCTRL_OCLKEN 0x00000100
#define CCKCTRL_ATACLKOEN 0x00000002
#define CCKCTRL_LCLKEN 0x00000001
#define QCHCD_IOS_SS 0x00000001
#define QCHSD_STPDIAG 0x00020000
#define INTMASK_MSK 0xD1000012
#define INTSTS_SERROR 0x80000000
#define INTSTS_PRERR 0x40000000
#define INTSTS_RERR 0x10000000
#define INTSTS_ICERR 0x01000000
#define INTSTS_BMSINT 0x00000010
#define INTSTS_BMHE 0x00000008
#define INTSTS_IOIRQS 0x00000004
#define INTSTS_INTRQ 0x00000002
#define INTSTS_ACTEINT 0x00000001
/* PIO transfer mode table */
/* JCHST */
static const unsigned long JCHSTtbl[2][7] = {
{0x0E, 0x05, 0x02, 0x03, 0x02, 0x00, 0x00}, /* 100MHz */
{0x13, 0x07, 0x04, 0x04, 0x03, 0x00, 0x00} /* 133MHz */
};
/* JCHHT */
static const unsigned long JCHHTtbl[2][7] = {
{0x0E, 0x02, 0x02, 0x02, 0x02, 0x00, 0x00}, /* 100MHz */
{0x13, 0x03, 0x03, 0x03, 0x03, 0x00, 0x00} /* 133MHz */
};
/* JCHCT */
static const unsigned long JCHCTtbl[2][7] = {
{0x1D, 0x1D, 0x1C, 0x0B, 0x06, 0x00, 0x00}, /* 100MHz */
{0x27, 0x26, 0x26, 0x0E, 0x09, 0x00, 0x00} /* 133MHz */
};
/* DMA transfer mode table */
/* JCHDCTM/JCHDCTS */
static const unsigned long JCHDCTxtbl[2][7] = {
{0x0A, 0x06, 0x04, 0x03, 0x01, 0x00, 0x00}, /* 100MHz */
{0x0E, 0x09, 0x06, 0x04, 0x02, 0x01, 0x00} /* 133MHz */
};
/* JCSTWTM/JCSTWTS */
static const unsigned long JCSTWTxtbl[2][7] = {
{0x06, 0x04, 0x03, 0x02, 0x02, 0x02, 0x00}, /* 100MHz */
{0x09, 0x06, 0x04, 0x02, 0x02, 0x02, 0x02} /* 133MHz */
};
/* JCTSS */
static const unsigned long JCTSStbl[2][7] = {
{0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x00}, /* 100MHz */
{0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05} /* 133MHz */
};
/* JCENVT */
static const unsigned long JCENVTtbl[2][7] = {
{0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x00}, /* 100MHz */
{0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02} /* 133MHz */
};
/* JCACTSELS/JCACTSELM */
static const unsigned long JCACTSELtbl[2][7] = {
{0x00, 0x00, 0x00, 0x00, 0x01, 0x01, 0x00}, /* 100MHz */
{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01} /* 133MHz */
};
static const struct pci_device_id scc_pci_tbl[] = {
{PCI_VENDOR_ID_TOSHIBA_2, PCI_DEVICE_ID_TOSHIBA_SCC_ATA,
PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
{ } /* terminate list */
};
/**
* scc_set_piomode - Initialize host controller PATA PIO timings
* @ap: Port whose timings we are configuring
* @adev: um
*
* Set PIO mode for device.
*
* LOCKING:
* None (inherited from caller).
*/
static void scc_set_piomode (struct ata_port *ap, struct ata_device *adev)
{
unsigned int pio = adev->pio_mode - XFER_PIO_0;
void __iomem *ctrl_base = ap->host->iomap[SCC_CTRL_BAR];
void __iomem *cckctrl_port = ctrl_base + SCC_CTL_CCKCTRL;
void __iomem *piosht_port = ctrl_base + SCC_CTL_PIOSHT;
void __iomem *pioct_port = ctrl_base + SCC_CTL_PIOCT;
unsigned long reg;
int offset;
reg = in_be32(cckctrl_port);
if (reg & CCKCTRL_ATACLKOEN)
offset = 1; /* 133MHz */
else
offset = 0; /* 100MHz */
reg = JCHSTtbl[offset][pio] << 16 | JCHHTtbl[offset][pio];
out_be32(piosht_port, reg);
reg = JCHCTtbl[offset][pio];
out_be32(pioct_port, reg);
}
/**
* scc_set_dmamode - Initialize host controller PATA DMA timings
* @ap: Port whose timings we are configuring
* @adev: um
* @udma: udma mode, 0 - 6
*
* Set UDMA mode for device.
*
* LOCKING:
* None (inherited from caller).
*/
static void scc_set_dmamode (struct ata_port *ap, struct ata_device *adev)
{
unsigned int udma = adev->dma_mode;
unsigned int is_slave = (adev->devno != 0);
u8 speed = udma;
void __iomem *ctrl_base = ap->host->iomap[SCC_CTRL_BAR];
void __iomem *cckctrl_port = ctrl_base + SCC_CTL_CCKCTRL;
void __iomem *mdmact_port = ctrl_base + SCC_CTL_MDMACT;
void __iomem *mcrcst_port = ctrl_base + SCC_CTL_MCRCST;
void __iomem *sdmact_port = ctrl_base + SCC_CTL_SDMACT;
void __iomem *scrcst_port = ctrl_base + SCC_CTL_SCRCST;
void __iomem *udenvt_port = ctrl_base + SCC_CTL_UDENVT;
void __iomem *tdvhsel_port = ctrl_base + SCC_CTL_TDVHSEL;
int offset, idx;
if (in_be32(cckctrl_port) & CCKCTRL_ATACLKOEN)
offset = 1; /* 133MHz */
else
offset = 0; /* 100MHz */
if (speed >= XFER_UDMA_0)
idx = speed - XFER_UDMA_0;
else
return;
if (is_slave) {
out_be32(sdmact_port, JCHDCTxtbl[offset][idx]);
out_be32(scrcst_port, JCSTWTxtbl[offset][idx]);
out_be32(tdvhsel_port,
(in_be32(tdvhsel_port) & ~TDVHSEL_SLAVE) | (JCACTSELtbl[offset][idx] << 2));
} else {
out_be32(mdmact_port, JCHDCTxtbl[offset][idx]);
out_be32(mcrcst_port, JCSTWTxtbl[offset][idx]);
out_be32(tdvhsel_port,
(in_be32(tdvhsel_port) & ~TDVHSEL_MASTER) | JCACTSELtbl[offset][idx]);
}
out_be32(udenvt_port,
JCTSStbl[offset][idx] << 16 | JCENVTtbl[offset][idx]);
}
unsigned long scc_mode_filter(struct ata_device *adev, unsigned long mask)
{
/* errata A308 workaround: limit ATAPI UDMA mode to UDMA4 */
if (adev->class == ATA_DEV_ATAPI &&
(mask & (0xE0 << ATA_SHIFT_UDMA))) {
printk(KERN_INFO "%s: limit ATAPI UDMA to UDMA4\n", DRV_NAME);
mask &= ~(0xE0 << ATA_SHIFT_UDMA);
}
return ata_pci_default_filter(adev, mask);
}
/**
* scc_tf_load - send taskfile registers to host controller
* @ap: Port to which output is sent
* @tf: ATA taskfile register set
*
* Note: Original code is ata_tf_load().
*/
static void scc_tf_load (struct ata_port *ap, const struct ata_taskfile *tf)
{
struct ata_ioports *ioaddr = &ap->ioaddr;
unsigned int is_addr = tf->flags & ATA_TFLAG_ISADDR;
if (tf->ctl != ap->last_ctl) {
out_be32(ioaddr->ctl_addr, tf->ctl);
ap->last_ctl = tf->ctl;
ata_wait_idle(ap);
}
if (is_addr && (tf->flags & ATA_TFLAG_LBA48)) {
out_be32(ioaddr->feature_addr, tf->hob_feature);
out_be32(ioaddr->nsect_addr, tf->hob_nsect);
out_be32(ioaddr->lbal_addr, tf->hob_lbal);
out_be32(ioaddr->lbam_addr, tf->hob_lbam);
out_be32(ioaddr->lbah_addr, tf->hob_lbah);
VPRINTK("hob: feat 0x%X nsect 0x%X, lba 0x%X 0x%X 0x%X\n",
tf->hob_feature,
tf->hob_nsect,
tf->hob_lbal,
tf->hob_lbam,
tf->hob_lbah);
}
if (is_addr) {
out_be32(ioaddr->feature_addr, tf->feature);
out_be32(ioaddr->nsect_addr, tf->nsect);
out_be32(ioaddr->lbal_addr, tf->lbal);
out_be32(ioaddr->lbam_addr, tf->lbam);
out_be32(ioaddr->lbah_addr, tf->lbah);
VPRINTK("feat 0x%X nsect 0x%X lba 0x%X 0x%X 0x%X\n",
tf->feature,
tf->nsect,
tf->lbal,
tf->lbam,
tf->lbah);
}
if (tf->flags & ATA_TFLAG_DEVICE) {
out_be32(ioaddr->device_addr, tf->device);
VPRINTK("device 0x%X\n", tf->device);
}
ata_wait_idle(ap);
}
/**
* scc_check_status - Read device status reg & clear interrupt
* @ap: port where the device is
*
* Note: Original code is ata_check_status().
*/
static u8 scc_check_status (struct ata_port *ap)
{
return in_be32(ap->ioaddr.status_addr);
}
/**
* scc_tf_read - input device's ATA taskfile shadow registers
* @ap: Port from which input is read
* @tf: ATA taskfile register set for storing input
*
* Note: Original code is ata_tf_read().
*/
static void scc_tf_read (struct ata_port *ap, struct ata_taskfile *tf)
{
struct ata_ioports *ioaddr = &ap->ioaddr;
tf->command = scc_check_status(ap);
tf->feature = in_be32(ioaddr->error_addr);
tf->nsect = in_be32(ioaddr->nsect_addr);
tf->lbal = in_be32(ioaddr->lbal_addr);
tf->lbam = in_be32(ioaddr->lbam_addr);
tf->lbah = in_be32(ioaddr->lbah_addr);
tf->device = in_be32(ioaddr->device_addr);
if (tf->flags & ATA_TFLAG_LBA48) {
out_be32(ioaddr->ctl_addr, tf->ctl | ATA_HOB);
tf->hob_feature = in_be32(ioaddr->error_addr);
tf->hob_nsect = in_be32(ioaddr->nsect_addr);
tf->hob_lbal = in_be32(ioaddr->lbal_addr);
tf->hob_lbam = in_be32(ioaddr->lbam_addr);
tf->hob_lbah = in_be32(ioaddr->lbah_addr);
out_be32(ioaddr->ctl_addr, tf->ctl);
ap->last_ctl = tf->ctl;
}
}
/**
* scc_exec_command - issue ATA command to host controller
* @ap: port to which command is being issued
* @tf: ATA taskfile register set
*
* Note: Original code is ata_exec_command().
*/
static void scc_exec_command (struct ata_port *ap,
const struct ata_taskfile *tf)
{
DPRINTK("ata%u: cmd 0x%X\n", ap->print_id, tf->command);
out_be32(ap->ioaddr.command_addr, tf->command);
ata_pause(ap);
}
/**
* scc_check_altstatus - Read device alternate status reg
* @ap: port where the device is
*/
static u8 scc_check_altstatus (struct ata_port *ap)
{
return in_be32(ap->ioaddr.altstatus_addr);
}
/**
* scc_std_dev_select - Select device 0/1 on ATA bus
* @ap: ATA channel to manipulate
* @device: ATA device (numbered from zero) to select
*
* Note: Original code is ata_std_dev_select().
*/
static void scc_std_dev_select (struct ata_port *ap, unsigned int device)
{
u8 tmp;
if (device == 0)
tmp = ATA_DEVICE_OBS;
else
tmp = ATA_DEVICE_OBS | ATA_DEV1;
out_be32(ap->ioaddr.device_addr, tmp);
ata_pause(ap);
}
/**
* scc_bmdma_setup - Set up PCI IDE BMDMA transaction
* @qc: Info associated with this ATA transaction.
*
* Note: Original code is ata_bmdma_setup().
*/
static void scc_bmdma_setup (struct ata_queued_cmd *qc)
{
struct ata_port *ap = qc->ap;
unsigned int rw = (qc->tf.flags & ATA_TFLAG_WRITE);
u8 dmactl;
void __iomem *mmio = ap->ioaddr.bmdma_addr;
/* load PRD table addr */
out_be32(mmio + SCC_DMA_TABLE_OFS, ap->prd_dma);
/* specify data direction, triple-check start bit is clear */
dmactl = in_be32(mmio + SCC_DMA_CMD);
dmactl &= ~(ATA_DMA_WR | ATA_DMA_START);
if (!rw)
dmactl |= ATA_DMA_WR;
out_be32(mmio + SCC_DMA_CMD, dmactl);
/* issue r/w command */
ap->ops->exec_command(ap, &qc->tf);
}
/**
* scc_bmdma_start - Start a PCI IDE BMDMA transaction
* @qc: Info associated with this ATA transaction.
*
* Note: Original code is ata_bmdma_start().
*/
static void scc_bmdma_start (struct ata_queued_cmd *qc)
{
struct ata_port *ap = qc->ap;
u8 dmactl;
void __iomem *mmio = ap->ioaddr.bmdma_addr;
/* start host DMA transaction */
dmactl = in_be32(mmio + SCC_DMA_CMD);
out_be32(mmio + SCC_DMA_CMD, dmactl | ATA_DMA_START);
}
/**
* scc_devchk - PATA device presence detection
* @ap: ATA channel to examine
* @device: Device to examine (starting at zero)
*
* Note: Original code is ata_devchk().
*/
static unsigned int scc_devchk (struct ata_port *ap,
unsigned int device)
{
struct ata_ioports *ioaddr = &ap->ioaddr;
u8 nsect, lbal;
ap->ops->dev_select(ap, device);
out_be32(ioaddr->nsect_addr, 0x55);
out_be32(ioaddr->lbal_addr, 0xaa);
out_be32(ioaddr->nsect_addr, 0xaa);
out_be32(ioaddr->lbal_addr, 0x55);
out_be32(ioaddr->nsect_addr, 0x55);
out_be32(ioaddr->lbal_addr, 0xaa);
nsect = in_be32(ioaddr->nsect_addr);
lbal = in_be32(ioaddr->lbal_addr);
if ((nsect == 0x55) && (lbal == 0xaa))
return 1; /* we found a device */
return 0; /* nothing found */
}
/**
* scc_bus_post_reset - PATA device post reset
*
* Note: Original code is ata_bus_post_reset().
*/
static int scc_bus_post_reset(struct ata_port *ap, unsigned int devmask,
unsigned long deadline)
{
struct ata_ioports *ioaddr = &ap->ioaddr;
unsigned int dev0 = devmask & (1 << 0);
unsigned int dev1 = devmask & (1 << 1);
int rc;
/* if device 0 was found in ata_devchk, wait for its
* BSY bit to clear
*/
if (dev0) {
rc = ata_wait_ready(ap, deadline);
if (rc && rc != -ENODEV)
return rc;
}
/* if device 1 was found in ata_devchk, wait for
* register access, then wait for BSY to clear
*/
while (dev1) {
u8 nsect, lbal;
ap->ops->dev_select(ap, 1);
nsect = in_be32(ioaddr->nsect_addr);
lbal = in_be32(ioaddr->lbal_addr);
if ((nsect == 1) && (lbal == 1))
break;
if (time_after(jiffies, deadline))
return -EBUSY;
msleep(50); /* give drive a breather */
}
if (dev1) {
rc = ata_wait_ready(ap, deadline);
if (rc && rc != -ENODEV)
return rc;
}
/* is all this really necessary? */
ap->ops->dev_select(ap, 0);
if (dev1)
ap->ops->dev_select(ap, 1);
if (dev0)
ap->ops->dev_select(ap, 0);
return 0;
}
/**
* scc_bus_softreset - PATA device software reset
*
* Note: Original code is ata_bus_softreset().
*/
static unsigned int scc_bus_softreset(struct ata_port *ap, unsigned int devmask,
unsigned long deadline)
{
struct ata_ioports *ioaddr = &ap->ioaddr;
DPRINTK("ata%u: bus reset via SRST\n", ap->print_id);
/* software reset. causes dev0 to be selected */
out_be32(ioaddr->ctl_addr, ap->ctl);
udelay(20);
out_be32(ioaddr->ctl_addr, ap->ctl | ATA_SRST);
udelay(20);
out_be32(ioaddr->ctl_addr, ap->ctl);
/* spec mandates ">= 2ms" before checking status.
* We wait 150ms, because that was the magic delay used for
* ATAPI devices in Hale Landis's ATADRVR, for the period of time
* between when the ATA command register is written, and then
* status is checked. Because waiting for "a while" before
* checking status is fine, post SRST, we perform this magic
* delay here as well.
*
* Old drivers/ide uses the 2mS rule and then waits for ready
*/
msleep(150);
/* Before we perform post reset processing we want to see if
* the bus shows 0xFF because the odd clown forgets the D7
* pulldown resistor.
*/
if (scc_check_status(ap) == 0xFF)
return 0;
scc_bus_post_reset(ap, devmask, deadline);
return 0;
}
/**
* scc_std_softreset - reset host port via ATA SRST
* @ap: port to reset
* @classes: resulting classes of attached devices
* @deadline: deadline jiffies for the operation
*
* Note: Original code is ata_std_softreset().
*/
static int scc_std_softreset (struct ata_port *ap, unsigned int *classes,
unsigned long deadline)
{
unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
unsigned int devmask = 0, err_mask;
u8 err;
DPRINTK("ENTER\n");
if (ata_port_offline(ap)) {
classes[0] = ATA_DEV_NONE;
goto out;
}
/* determine if device 0/1 are present */
if (scc_devchk(ap, 0))
devmask |= (1 << 0);
if (slave_possible && scc_devchk(ap, 1))
devmask |= (1 << 1);
/* select device 0 again */
ap->ops->dev_select(ap, 0);
/* issue bus reset */
DPRINTK("about to softreset, devmask=%x\n", devmask);
err_mask = scc_bus_softreset(ap, devmask, deadline);
if (err_mask) {
ata_port_printk(ap, KERN_ERR, "SRST failed (err_mask=0x%x)\n",
err_mask);
return -EIO;
}
/* determine by signature whether we have ATA or ATAPI devices */
classes[0] = ata_dev_try_classify(ap, 0, &err);
if (slave_possible && err != 0x81)
classes[1] = ata_dev_try_classify(ap, 1, &err);
out:
DPRINTK("EXIT, classes[0]=%u [1]=%u\n", classes[0], classes[1]);
return 0;
}
/**
* scc_bmdma_stop - Stop PCI IDE BMDMA transfer
* @qc: Command we are ending DMA for
*/
static void scc_bmdma_stop (struct ata_queued_cmd *qc)
{
struct ata_port *ap = qc->ap;
void __iomem *ctrl_base = ap->host->iomap[SCC_CTRL_BAR];
void __iomem *bmid_base = ap->host->iomap[SCC_BMID_BAR];
u32 reg;
while (1) {
reg = in_be32(bmid_base + SCC_DMA_INTST);
if (reg & INTSTS_SERROR) {
printk(KERN_WARNING "%s: SERROR\n", DRV_NAME);
out_be32(bmid_base + SCC_DMA_INTST, INTSTS_SERROR|INTSTS_BMSINT);
out_be32(bmid_base + SCC_DMA_CMD,
in_be32(bmid_base + SCC_DMA_CMD) & ~ATA_DMA_START);
continue;
}
if (reg & INTSTS_PRERR) {
u32 maea0, maec0;
maea0 = in_be32(ctrl_base + SCC_CTL_MAEA0);
maec0 = in_be32(ctrl_base + SCC_CTL_MAEC0);
printk(KERN_WARNING "%s: PRERR [addr:%x cmd:%x]\n", DRV_NAME, maea0, maec0);
out_be32(bmid_base + SCC_DMA_INTST, INTSTS_PRERR|INTSTS_BMSINT);
out_be32(bmid_base + SCC_DMA_CMD,
in_be32(bmid_base + SCC_DMA_CMD) & ~ATA_DMA_START);
continue;
}
if (reg & INTSTS_RERR) {
printk(KERN_WARNING "%s: Response Error\n", DRV_NAME);
out_be32(bmid_base + SCC_DMA_INTST, INTSTS_RERR|INTSTS_BMSINT);
out_be32(bmid_base + SCC_DMA_CMD,
in_be32(bmid_base + SCC_DMA_CMD) & ~ATA_DMA_START);
continue;
}
if (reg & INTSTS_ICERR) {
out_be32(bmid_base + SCC_DMA_CMD,
in_be32(bmid_base + SCC_DMA_CMD) & ~ATA_DMA_START);
printk(KERN_WARNING "%s: Illegal Configuration\n", DRV_NAME);
out_be32(bmid_base + SCC_DMA_INTST, INTSTS_ICERR|INTSTS_BMSINT);
continue;
}
if (reg & INTSTS_BMSINT) {
unsigned int classes;
unsigned long deadline = jiffies + ATA_TMOUT_BOOT;
printk(KERN_WARNING "%s: Internal Bus Error\n", DRV_NAME);
out_be32(bmid_base + SCC_DMA_INTST, INTSTS_BMSINT);
/* TBD: SW reset */
scc_std_softreset(ap, &classes, deadline);
continue;
}
if (reg & INTSTS_BMHE) {
out_be32(bmid_base + SCC_DMA_INTST, INTSTS_BMHE);
continue;
}
if (reg & INTSTS_ACTEINT) {
out_be32(bmid_base + SCC_DMA_INTST, INTSTS_ACTEINT);
continue;
}
if (reg & INTSTS_IOIRQS) {
out_be32(bmid_base + SCC_DMA_INTST, INTSTS_IOIRQS);
continue;
}
break;
}
/* clear start/stop bit */
out_be32(bmid_base + SCC_DMA_CMD,
in_be32(bmid_base + SCC_DMA_CMD) & ~ATA_DMA_START);
/* one-PIO-cycle guaranteed wait, per spec, for HDMA1:0 transition */
ata_altstatus(ap); /* dummy read */
}
/**
* scc_bmdma_status - Read PCI IDE BMDMA status
* @ap: Port associated with this ATA transaction.
*/
static u8 scc_bmdma_status (struct ata_port *ap)
{
void __iomem *mmio = ap->ioaddr.bmdma_addr;
u8 host_stat = in_be32(mmio + SCC_DMA_STATUS);
u32 int_status = in_be32(mmio + SCC_DMA_INTST);
struct ata_queued_cmd *qc = ata_qc_from_tag(ap, ap->active_tag);
static int retry = 0;
/* return if IOS_SS is cleared */
if (!(in_be32(mmio + SCC_DMA_CMD) & ATA_DMA_START))
return host_stat;
/* errata A252,A308 workaround: Step4 */
if ((ata_altstatus(ap) & ATA_ERR) && (int_status & INTSTS_INTRQ))
return (host_stat | ATA_DMA_INTR);
/* errata A308 workaround Step5 */
if (int_status & INTSTS_IOIRQS) {
host_stat |= ATA_DMA_INTR;
/* We don't check ATAPI DMA because it is limited to UDMA4 */
if ((qc->tf.protocol == ATA_PROT_DMA &&
qc->dev->xfer_mode > XFER_UDMA_4)) {
if (!(int_status & INTSTS_ACTEINT)) {
printk(KERN_WARNING "ata%u: operation failed (transfer data loss)\n",
ap->print_id);
host_stat |= ATA_DMA_ERR;
if (retry++)
ap->udma_mask &= ~(1 << qc->dev->xfer_mode);
} else
retry = 0;
}
}
return host_stat;
}
/**
* scc_data_xfer - Transfer data by PIO
* @adev: device for this I/O
* @buf: data buffer
* @buflen: buffer length
* @write_data: read/write
*
* Note: Original code is ata_data_xfer().
*/
static void scc_data_xfer (struct ata_device *adev, unsigned char *buf,
unsigned int buflen, int write_data)
{
struct ata_port *ap = adev->ap;
unsigned int words = buflen >> 1;
unsigned int i;
u16 *buf16 = (u16 *) buf;
void __iomem *mmio = ap->ioaddr.data_addr;
/* Transfer multiple of 2 bytes */
if (write_data) {
for (i = 0; i < words; i++)
out_be32(mmio, cpu_to_le16(buf16[i]));
} else {
for (i = 0; i < words; i++)
buf16[i] = le16_to_cpu(in_be32(mmio));
}
/* Transfer trailing 1 byte, if any. */
if (unlikely(buflen & 0x01)) {
u16 align_buf[1] = { 0 };
unsigned char *trailing_buf = buf + buflen - 1;
if (write_data) {
memcpy(align_buf, trailing_buf, 1);
out_be32(mmio, cpu_to_le16(align_buf[0]));
} else {
align_buf[0] = le16_to_cpu(in_be32(mmio));
memcpy(trailing_buf, align_buf, 1);
}
}
}
/**
* scc_irq_on - Enable interrupts on a port.
* @ap: Port on which interrupts are enabled.
*
* Note: Original code is ata_irq_on().
*/
static u8 scc_irq_on (struct ata_port *ap)
{
struct ata_ioports *ioaddr = &ap->ioaddr;
u8 tmp;
ap->ctl &= ~ATA_NIEN;
ap->last_ctl = ap->ctl;
out_be32(ioaddr->ctl_addr, ap->ctl);
tmp = ata_wait_idle(ap);
ap->ops->irq_clear(ap);
return tmp;
}
/**
* scc_irq_ack - Acknowledge a device interrupt.
* @ap: Port on which interrupts are enabled.
*
* Note: Original code is ata_irq_ack().
*/
static u8 scc_irq_ack (struct ata_port *ap, unsigned int chk_drq)
{
unsigned int bits = chk_drq ? ATA_BUSY | ATA_DRQ : ATA_BUSY;
u8 host_stat, post_stat, status;
status = ata_busy_wait(ap, bits, 1000);
if (status & bits)
if (ata_msg_err(ap))
printk(KERN_ERR "abnormal status 0x%X\n", status);
/* get controller status; clear intr, err bits */
host_stat = in_be32(ap->ioaddr.bmdma_addr + SCC_DMA_STATUS);
out_be32(ap->ioaddr.bmdma_addr + SCC_DMA_STATUS,
host_stat | ATA_DMA_INTR | ATA_DMA_ERR);
post_stat = in_be32(ap->ioaddr.bmdma_addr + SCC_DMA_STATUS);
if (ata_msg_intr(ap))
printk(KERN_INFO "%s: irq ack: host_stat 0x%X, new host_stat 0x%X, drv_stat 0x%X\n",
__FUNCTION__,
host_stat, post_stat, status);
return status;
}
/**
* scc_bmdma_freeze - Freeze BMDMA controller port
* @ap: port to freeze
*
* Note: Original code is ata_bmdma_freeze().
*/
static void scc_bmdma_freeze (struct ata_port *ap)
{
struct ata_ioports *ioaddr = &ap->ioaddr;
ap->ctl |= ATA_NIEN;
ap->last_ctl = ap->ctl;
out_be32(ioaddr->ctl_addr, ap->ctl);
/* Under certain circumstances, some controllers raise IRQ on
* ATA_NIEN manipulation. Also, many controllers fail to mask
* previously pending IRQ on ATA_NIEN assertion. Clear it.
*/
ata_chk_status(ap);
ap->ops->irq_clear(ap);
}
/**
* scc_pata_prereset - prepare for reset
* @ap: ATA port to be reset
* @deadline: deadline jiffies for the operation
*/
static int scc_pata_prereset(struct ata_port *ap, unsigned long deadline)
{
ap->cbl = ATA_CBL_PATA80;
return ata_std_prereset(ap, deadline);
}
/**
* scc_std_postreset - standard postreset callback
* @ap: the target ata_port
* @classes: classes of attached devices
*
* Note: Original code is ata_std_postreset().
*/
static void scc_std_postreset (struct ata_port *ap, unsigned int *classes)
{
DPRINTK("ENTER\n");
/* is double-select really necessary? */
if (classes[0] != ATA_DEV_NONE)
ap->ops->dev_select(ap, 1);
if (classes[1] != ATA_DEV_NONE)
ap->ops->dev_select(ap, 0);
/* bail out if no device is present */
if (classes[0] == ATA_DEV_NONE && classes[1] == ATA_DEV_NONE) {
DPRINTK("EXIT, no device\n");
return;
}
/* set up device control */
if (ap->ioaddr.ctl_addr)
out_be32(ap->ioaddr.ctl_addr, ap->ctl);
DPRINTK("EXIT\n");
}
/**
* scc_error_handler - Stock error handler for BMDMA controller
* @ap: port to handle error for
*/
static void scc_error_handler (struct ata_port *ap)
{
ata_bmdma_drive_eh(ap, scc_pata_prereset, scc_std_softreset, NULL,
scc_std_postreset);
}
/**
* scc_bmdma_irq_clear - Clear PCI IDE BMDMA interrupt.
* @ap: Port associated with this ATA transaction.
*
* Note: Original code is ata_bmdma_irq_clear().
*/
static void scc_bmdma_irq_clear (struct ata_port *ap)
{
void __iomem *mmio = ap->ioaddr.bmdma_addr;
if (!mmio)
return;
out_be32(mmio + SCC_DMA_STATUS, in_be32(mmio + SCC_DMA_STATUS));
}
/**
* scc_port_start - Set port up for dma.
* @ap: Port to initialize
*
* Allocate space for PRD table using ata_port_start().
* Set PRD table address for PTERADD. (PRD Transfer End Read)
*/
static int scc_port_start (struct ata_port *ap)
{
void __iomem *mmio = ap->ioaddr.bmdma_addr;
int rc;
rc = ata_port_start(ap);
if (rc)
return rc;
out_be32(mmio + SCC_DMA_PTERADD, ap->prd_dma);
return 0;
}
/**
* scc_port_stop - Undo scc_port_start()
* @ap: Port to shut down
*
* Reset PTERADD.
*/
static void scc_port_stop (struct ata_port *ap)
{
void __iomem *mmio = ap->ioaddr.bmdma_addr;