// SPDX-License-Identifier: GPL-2.0-only
/*
* pata_cmd64x . c - CMD64x PATA for new ATA layer
* ( C ) 2005 Red Hat Inc
* Alan Cox < alan @ lxorguk . ukuu . org . uk >
* ( C ) 2009 - 2010 Bartlomiej Zolnierkiewicz
* ( C ) 2012 MontaVista Software , LLC < source @ mvista . com >
*
* Based upon
* linux / drivers / ide / pci / cmd64x . c Version 1 . 30 Sept 10 , 2002
*
* cmd64x . c : Enable interrupts at initialization time on Ultra / PCI machines .
* Note , this driver is not used at all on other systems because
* there the " BIOS " has done all of the following already .
* Due to massive hardware bugs , UltraDMA is only supported
* on the 646 U2 and not on the 646 U .
*
* Copyright ( C ) 1998 Eddie C . Dost ( ecd @ skynet . be )
* Copyright ( C ) 1998 David S . Miller ( davem @ redhat . com )
*
* Copyright ( C ) 1999 - 2002 Andre Hedrick < andre @ linux - ide . org >
*
* TODO
* Testing work
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/blkdev.h>
#include <linux/delay.h>
#include <scsi/scsi_host.h>
#include <linux/libata.h>
#define DRV_NAME "pata_cmd64x"
#define DRV_VERSION "0.2.18"
/*
* CMD64x specific registers definition .
*/
enum {
CFR = 0 x50,
CFR_INTR_CH0 = 0 x04,
CNTRL = 0 x51,
CNTRL_CH0 = 0 x04,
CNTRL_CH1 = 0 x08,
CMDTIM = 0 x52,
ARTTIM0 = 0 x53,
DRWTIM0 = 0 x54,
ARTTIM1 = 0 x55,
DRWTIM1 = 0 x56,
ARTTIM23 = 0 x57,
ARTTIM23_DIS_RA2 = 0 x04,
ARTTIM23_DIS_RA3 = 0 x08,
ARTTIM23_INTR_CH1 = 0 x10,
DRWTIM2 = 0 x58,
BRST = 0 x59,
DRWTIM3 = 0 x5b,
BMIDECR0 = 0 x70,
MRDMODE = 0 x71,
MRDMODE_INTR_CH0 = 0 x04,
MRDMODE_INTR_CH1 = 0 x08,
BMIDESR0 = 0 x72,
UDIDETCR0 = 0 x73,
DTPR0 = 0 x74,
BMIDECR1 = 0 x78,
BMIDECSR = 0 x79,
UDIDETCR1 = 0 x7B,
DTPR1 = 0 x7C
};
static int cmd648_cable_detect(struct ata_port *ap)
{
struct pci_dev *pdev = to_pci_dev(ap->host->dev);
u8 r;
/* Check cable detect bits */
pci_read_config_byte(pdev, BMIDECSR, &r);
if (r & (1 << ap->port_no))
return ATA_CBL_PATA80;
return ATA_CBL_PATA40;
}
/**
* cmd64x_set_timing - set PIO and MWDMA timing
* @ ap : ATA interface
* @ adev : ATA device
* @ mode : mode
*
* Called to do the PIO and MWDMA mode setup .
*/
static void cmd64x_set_timing(struct ata_port *ap, struct ata_device *adev, u8 mode)
{
struct pci_dev *pdev = to_pci_dev(ap->host->dev);
struct ata_timing t;
const unsigned long T = 1000000 / 33 ;
const u8 setup_data[] = { 0 x40, 0 x40, 0 x40, 0 x80, 0 x00 };
u8 reg;
/* Port layout is not logical so use a table */
const u8 arttim_port[2 ][2 ] = {
{ ARTTIM0, ARTTIM1 },
{ ARTTIM23, ARTTIM23 }
};
const u8 drwtim_port[2 ][2 ] = {
{ DRWTIM0, DRWTIM1 },
{ DRWTIM2, DRWTIM3 }
};
int arttim = arttim_port[ap->port_no][adev->devno];
int drwtim = drwtim_port[ap->port_no][adev->devno];
/* ata_timing_compute is smart and will produce timings for MWDMA
that don't violate the drives PIO capabilities. */
if (ata_timing_compute(adev, mode, &t, T, 0 ) < 0 ) {
ata_dev_err(adev, DRV_NAME ": mode computation failed.\n" );
return ;
}
if (ap->port_no) {
/* Slave has shared address setup */
struct ata_device *pair = ata_dev_pair(adev);
if (pair) {
struct ata_timing tp;
ata_timing_compute(pair, pair->pio_mode, &tp, T, 0 );
ata_timing_merge(&t, &tp, &t, ATA_TIMING_SETUP);
}
}
ata_dev_dbg(adev, DRV_NAME ": active %d recovery %d setup %d.\n" ,
t.active, t.recover, t.setup);
if (t.recover > 16 ) {
t.active += t.recover - 16 ;
t.recover = 16 ;
}
if (t.active > 16 )
t.active = 16 ;
/* Now convert the clocks into values we can actually stuff into
the chip */
if (t.recover == 16 )
t.recover = 0 ;
else if (t.recover > 1 )
t.recover--;
else
t.recover = 15 ;
if (t.setup > 4 )
t.setup = 0 xC0;
else
t.setup = setup_data[t.setup];
t.active &= 0 x0F; /* 0 = 16 */
/* Load setup timing */
pci_read_config_byte(pdev, arttim, ®);
reg &= 0 x3F;
reg |= t.setup;
pci_write_config_byte(pdev, arttim, reg);
/* Load active/recovery */
pci_write_config_byte(pdev, drwtim, (t.active << 4 ) | t.recover);
}
/**
* cmd64x_set_piomode - set initial PIO mode data
* @ ap : ATA interface
* @ adev : ATA device
*
* Used when configuring the devices ot set the PIO timings . All the
* actual work is done by the PIO / MWDMA setting helper
*/
static void cmd64x_set_piomode(struct ata_port *ap, struct ata_device *adev)
{
cmd64x_set_timing(ap, adev, adev->pio_mode);
}
/**
* cmd64x_set_dmamode - set initial DMA mode data
* @ ap : ATA interface
* @ adev : ATA device
*
* Called to do the DMA mode setup .
*/
static void cmd64x_set_dmamode(struct ata_port *ap, struct ata_device *adev)
{
static const u8 udma_data[] = {
0 x30, 0 x20, 0 x10, 0 x20, 0 x10, 0 x00
};
struct pci_dev *pdev = to_pci_dev(ap->host->dev);
u8 regU, regD;
int pciU = UDIDETCR0 + 8 * ap->port_no;
int pciD = BMIDESR0 + 8 * ap->port_no;
int shift = 2 * adev->devno;
pci_read_config_byte(pdev, pciD, ®D);
pci_read_config_byte(pdev, pciU, ®U);
/* DMA bits off */
regD &= ~(0 x20 << adev->devno);
/* DMA control bits */
regU &= ~(0 x30 << shift);
/* DMA timing bits */
regU &= ~(0 x05 << adev->devno);
if (adev->dma_mode >= XFER_UDMA_0) {
/* Merge the timing value */
regU |= udma_data[adev->dma_mode - XFER_UDMA_0] << shift;
/* Merge the control bits */
regU |= 1 << adev->devno; /* UDMA on */
if (adev->dma_mode > XFER_UDMA_2) /* 15nS timing */
regU |= 4 << adev->devno;
} else {
regU &= ~ (1 << adev->devno); /* UDMA off */
cmd64x_set_timing(ap, adev, adev->dma_mode);
}
regD |= 0 x20 << adev->devno;
pci_write_config_byte(pdev, pciU, regU);
pci_write_config_byte(pdev, pciD, regD);
}
/**
* cmd64x_sff_irq_check - check IDE interrupt
* @ ap : ATA interface
*
* Check IDE interrupt in CFR / ARTTIM23 registers .
*/
static bool cmd64x_sff_irq_check(struct ata_port *ap)
{
struct pci_dev *pdev = to_pci_dev(ap->host->dev);
int irq_mask = ap->port_no ? ARTTIM23_INTR_CH1 : CFR_INTR_CH0;
int irq_reg = ap->port_no ? ARTTIM23 : CFR;
u8 irq_stat;
/* NOTE: reading the register should clear the interrupt */
pci_read_config_byte(pdev, irq_reg, &irq_stat);
return irq_stat & irq_mask;
}
/**
* cmd64x_sff_irq_clear - clear IDE interrupt
* @ ap : ATA interface
*
* Clear IDE interrupt in CFR / ARTTIM23 and DMA status registers .
*/
static void cmd64x_sff_irq_clear(struct ata_port *ap)
{
struct pci_dev *pdev = to_pci_dev(ap->host->dev);
int irq_reg = ap->port_no ? ARTTIM23 : CFR;
u8 irq_stat;
ata_bmdma_irq_clear(ap);
/* Reading the register should be enough to clear the interrupt */
pci_read_config_byte(pdev, irq_reg, &irq_stat);
}
/**
* cmd648_sff_irq_check - check IDE interrupt
* @ ap : ATA interface
*
* Check IDE interrupt in MRDMODE register .
*/
static bool cmd648_sff_irq_check(struct ata_port *ap)
{
struct pci_dev *pdev = to_pci_dev(ap->host->dev);
unsigned long base = pci_resource_start(pdev, 4 );
int irq_mask = ap->port_no ? MRDMODE_INTR_CH1 : MRDMODE_INTR_CH0;
u8 mrdmode = inb(base + 1 );
return mrdmode & irq_mask;
}
/**
* cmd648_sff_irq_clear - clear IDE interrupt
* @ ap : ATA interface
*
* Clear IDE interrupt in MRDMODE and DMA status registers .
*/
static void cmd648_sff_irq_clear(struct ata_port *ap)
{
struct pci_dev *pdev = to_pci_dev(ap->host->dev);
unsigned long base = pci_resource_start(pdev, 4 );
int irq_mask = ap->port_no ? MRDMODE_INTR_CH1 : MRDMODE_INTR_CH0;
u8 mrdmode;
ata_bmdma_irq_clear(ap);
/* Clear this port's interrupt bit (leaving the other port alone) */
mrdmode = inb(base + 1 );
mrdmode &= ~(MRDMODE_INTR_CH0 | MRDMODE_INTR_CH1);
outb(mrdmode | irq_mask, base + 1 );
}
/**
* cmd646r1_bmdma_stop - DMA stop callback
* @ qc : Command in progress
*
* Stub for now while investigating the r1 quirk in the old driver .
*/
static void cmd646r1_bmdma_stop(struct ata_queued_cmd *qc)
{
ata_bmdma_stop(qc);
}
static const struct scsi_host_template cmd64x_sht = {
ATA_BMDMA_SHT(DRV_NAME),
};
static const struct ata_port_operations cmd64x_base_ops = {
.inherits = &ata_bmdma_port_ops,
.set_piomode = cmd64x_set_piomode,
.set_dmamode = cmd64x_set_dmamode,
};
static struct ata_port_operations cmd64x_port_ops = {
.inherits = &cmd64x_base_ops,
.sff_irq_check = cmd64x_sff_irq_check,
.sff_irq_clear = cmd64x_sff_irq_clear,
.cable_detect = ata_cable_40wire,
};
static struct ata_port_operations cmd646r1_port_ops = {
.inherits = &cmd64x_base_ops,
.sff_irq_check = cmd64x_sff_irq_check,
.sff_irq_clear = cmd64x_sff_irq_clear,
.bmdma_stop = cmd646r1_bmdma_stop,
.cable_detect = ata_cable_40wire,
};
static struct ata_port_operations cmd646r3_port_ops = {
.inherits = &cmd64x_base_ops,
.sff_irq_check = cmd648_sff_irq_check,
.sff_irq_clear = cmd648_sff_irq_clear,
.cable_detect = ata_cable_40wire,
};
static struct ata_port_operations cmd648_port_ops = {
.inherits = &cmd64x_base_ops,
.sff_irq_check = cmd648_sff_irq_check,
.sff_irq_clear = cmd648_sff_irq_clear,
.cable_detect = cmd648_cable_detect,
};
static void cmd64x_fixup(struct pci_dev *pdev)
{
u8 mrdmode;
pci_write_config_byte(pdev, PCI_LATENCY_TIMER, 64 );
pci_read_config_byte(pdev, MRDMODE, &mrdmode);
mrdmode &= ~0 x30; /* IRQ set up */
mrdmode |= 0 x02; /* Memory read line enable */
pci_write_config_byte(pdev, MRDMODE, mrdmode);
/* PPC specific fixup copied from old driver */
#ifdef CONFIG_PPC
pci_write_config_byte(pdev, UDIDETCR0, 0 xF0);
#endif
}
static int cmd64x_init_one(struct pci_dev *pdev, const struct pci_device_id *id)
{
static const struct ata_port_info cmd_info[7 ] = {
{ /* CMD 643 - no UDMA */
.flags = ATA_FLAG_SLAVE_POSS,
.pio_mask = ATA_PIO4,
.mwdma_mask = ATA_MWDMA2,
.port_ops = &cmd64x_port_ops
},
{ /* CMD 646 with broken UDMA */
.flags = ATA_FLAG_SLAVE_POSS,
.pio_mask = ATA_PIO4,
.mwdma_mask = ATA_MWDMA2,
.port_ops = &cmd64x_port_ops
},
{ /* CMD 646U with broken UDMA */
.flags = ATA_FLAG_SLAVE_POSS,
.pio_mask = ATA_PIO4,
.mwdma_mask = ATA_MWDMA2,
.port_ops = &cmd646r3_port_ops
},
{ /* CMD 646U2 with working UDMA */
.flags = ATA_FLAG_SLAVE_POSS,
.pio_mask = ATA_PIO4,
.mwdma_mask = ATA_MWDMA2,
.udma_mask = ATA_UDMA2,
.port_ops = &cmd646r3_port_ops
},
{ /* CMD 646 rev 1 */
.flags = ATA_FLAG_SLAVE_POSS,
.pio_mask = ATA_PIO4,
.mwdma_mask = ATA_MWDMA2,
.port_ops = &cmd646r1_port_ops
},
{ /* CMD 648 */
.flags = ATA_FLAG_SLAVE_POSS,
.pio_mask = ATA_PIO4,
.mwdma_mask = ATA_MWDMA2,
.udma_mask = ATA_UDMA4,
.port_ops = &cmd648_port_ops
},
{ /* CMD 649 */
.flags = ATA_FLAG_SLAVE_POSS,
.pio_mask = ATA_PIO4,
.mwdma_mask = ATA_MWDMA2,
.udma_mask = ATA_UDMA5,
.port_ops = &cmd648_port_ops
}
};
const struct ata_port_info *ppi[] = {
&cmd_info[id->driver_data],
&cmd_info[id->driver_data],
NULL
};
u8 reg;
int rc;
struct pci_dev *bridge = pdev->bus->self;
/* mobility split bridges don't report enabled ports correctly */
int port_ok = !(bridge && bridge->vendor ==
PCI_VENDOR_ID_MOBILITY_ELECTRONICS);
/* all (with exceptions below) apart from 643 have CNTRL_CH0 bit */
int cntrl_ch0_ok = (id->driver_data != 0 );
rc = pcim_enable_device(pdev);
if (rc)
return rc;
if (id->driver_data == 0 ) /* 643 */
ata_pci_bmdma_clear_simplex(pdev);
if (pdev->device == PCI_DEVICE_ID_CMD_646)
switch (pdev->revision) {
/* UDMA works since rev 5 */
default :
ppi[0 ] = &cmd_info[3 ];
ppi[1 ] = &cmd_info[3 ];
break ;
/* Interrupts in MRDMODE since rev 3 */
case 3 :
case 4 :
ppi[0 ] = &cmd_info[2 ];
ppi[1 ] = &cmd_info[2 ];
break ;
/* Rev 1 with other problems? */
case 1 :
ppi[0 ] = &cmd_info[4 ];
ppi[1 ] = &cmd_info[4 ];
fallthrough;
/* Early revs have no CNTRL_CH0 */
case 2 :
case 0 :
cntrl_ch0_ok = 0 ;
break ;
}
cmd64x_fixup(pdev);
/* check for enabled ports */
pci_read_config_byte(pdev, CNTRL, ®);
if (!port_ok)
dev_notice(&pdev->dev, "Mobility Bridge detected, ignoring CNTRL port enable/disable\n" );
if (port_ok && cntrl_ch0_ok && !(reg & CNTRL_CH0)) {
dev_notice(&pdev->dev, "Primary port is disabled\n" );
ppi[0 ] = &ata_dummy_port_info;
}
if (port_ok && !(reg & CNTRL_CH1)) {
dev_notice(&pdev->dev, "Secondary port is disabled\n" );
ppi[1 ] = &ata_dummy_port_info;
}
return ata_pci_bmdma_init_one(pdev, ppi, &cmd64x_sht, NULL, 0 );
}
#ifdef CONFIG_PM_SLEEP
static int cmd64x_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;
cmd64x_fixup(pdev);
ata_host_resume(host);
return 0 ;
}
#endif
static const struct pci_device_id cmd64x[] = {
{ PCI_VDEVICE(CMD, PCI_DEVICE_ID_CMD_643), 0 },
{ PCI_VDEVICE(CMD, PCI_DEVICE_ID_CMD_646), 1 },
{ PCI_VDEVICE(CMD, PCI_DEVICE_ID_CMD_648), 5 },
{ PCI_VDEVICE(CMD, PCI_DEVICE_ID_CMD_649), 6 },
{ },
};
static struct pci_driver cmd64x_pci_driver = {
.name = DRV_NAME,
.id_table = cmd64x,
.probe = cmd64x_init_one,
.remove = ata_pci_remove_one,
#ifdef CONFIG_PM_SLEEP
.suspend = ata_pci_device_suspend,
.resume = cmd64x_reinit_one,
#endif
};
module_pci_driver(cmd64x_pci_driver);
MODULE_AUTHOR("Alan Cox" );
MODULE_DESCRIPTION("low-level driver for CMD64x series PATA controllers" );
MODULE_LICENSE("GPL" );
MODULE_DEVICE_TABLE(pci, cmd64x);
MODULE_VERSION(DRV_VERSION);
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