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linux/drivers/ata/pata_hpt3x2n.c
Sergei Shtylyov 256ace9bbd pata_hpt3x2n: fix clock turnaround 
The clock turnaround code still doesn't work for several reasons:

- 'USE_DPLL' flag in 'ap->host->private_data' is never initialized
  or updated, so the driver can only set the chip to the DPLL clock
  mode, not the PCI mode;

- the driver doesn't serialize access to the channels depending on
  the current clock mode like the vendor drivers, so the clock
  turnaround is only executed "optionally", not always as it should be;

- the wrong ports are written to when hpt3x2n_set_clock() is called
  for the secondary channel;

- hpt3x2n_set_clock() can inadvertently enable the disabled channels
  when resetting the channel state machines.

Signed-off-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Cc: stable@kernel.org
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
2009-12-17 01:11:27 -05:00

596 lines
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/*
* Libata driver for the highpoint 372N and 302N UDMA66 ATA controllers.
*
* This driver is heavily based upon:
*
* linux/drivers/ide/pci/hpt366.c Version 0.36 April 25, 2003
*
* Copyright (C) 1999-2003 Andre Hedrick <andre@linux-ide.org>
* Portions Copyright (C) 2001 Sun Microsystems, Inc.
* Portions Copyright (C) 2003 Red Hat Inc
* Portions Copyright (C) 2005-2009 MontaVista Software, Inc.
*
*
* TODO
* Work out best PLL policy
*/
#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 <scsi/scsi_host.h>
#include <linux/libata.h>
#define DRV_NAME "pata_hpt3x2n"
#define DRV_VERSION "0.3.8"
enum {
HPT_PCI_FAST = (1 << 31),
PCI66 = (1 << 1),
USE_DPLL = (1 << 0)
};
struct hpt_clock {
u8 xfer_speed;
u32 timing;
};
struct hpt_chip {
const char *name;
struct hpt_clock *clocks[3];
};
/* key for bus clock timings
* bit
* 0:3 data_high_time. inactive time of DIOW_/DIOR_ for PIO and MW
* DMA. cycles = value + 1
* 4:8 data_low_time. active time of DIOW_/DIOR_ for PIO and MW
* DMA. cycles = value + 1
* 9:12 cmd_high_time. inactive time of DIOW_/DIOR_ during task file
* register access.
* 13:17 cmd_low_time. active time of DIOW_/DIOR_ during task file
* register access.
* 18:21 udma_cycle_time. clock freq and clock cycles for UDMA xfer.
* during task file register access.
* 22:24 pre_high_time. time to initialize 1st cycle for PIO and MW DMA
* xfer.
* 25:27 cmd_pre_high_time. time to initialize 1st PIO cycle for task
* register access.
* 28 UDMA enable
* 29 DMA enable
* 30 PIO_MST enable. if set, the chip is in bus master mode during
* PIO.
* 31 FIFO enable.
*/
/* 66MHz DPLL clocks */
static struct hpt_clock hpt3x2n_clocks[] = {
{ XFER_UDMA_7, 0x1c869c62 },
{ XFER_UDMA_6, 0x1c869c62 },
{ XFER_UDMA_5, 0x1c8a9c62 },
{ XFER_UDMA_4, 0x1c8a9c62 },
{ XFER_UDMA_3, 0x1c8e9c62 },
{ XFER_UDMA_2, 0x1c929c62 },
{ XFER_UDMA_1, 0x1c9a9c62 },
{ XFER_UDMA_0, 0x1c829c62 },
{ XFER_MW_DMA_2, 0x2c829c62 },
{ XFER_MW_DMA_1, 0x2c829c66 },
{ XFER_MW_DMA_0, 0x2c829d2e },
{ XFER_PIO_4, 0x0c829c62 },
{ XFER_PIO_3, 0x0c829c84 },
{ XFER_PIO_2, 0x0c829ca6 },
{ XFER_PIO_1, 0x0d029d26 },
{ XFER_PIO_0, 0x0d029d5e },
};
/**
* hpt3x2n_find_mode - reset the hpt3x2n bus
* @ap: ATA port
* @speed: transfer mode
*
* Return the 32bit register programming information for this channel
* that matches the speed provided. For the moment the clocks table
* is hard coded but easy to change. This will be needed if we use
* different DPLLs
*/
static u32 hpt3x2n_find_mode(struct ata_port *ap, int speed)
{
struct hpt_clock *clocks = hpt3x2n_clocks;
while(clocks->xfer_speed) {
if (clocks->xfer_speed == speed)
return clocks->timing;
clocks++;
}
BUG();
return 0xffffffffU; /* silence compiler warning */
}
/**
* hpt3x2n_cable_detect - Detect the cable type
* @ap: ATA port to detect on
*
* Return the cable type attached to this port
*/
static int hpt3x2n_cable_detect(struct ata_port *ap)
{
u8 scr2, ata66;
struct pci_dev *pdev = to_pci_dev(ap->host->dev);
pci_read_config_byte(pdev, 0x5B, &scr2);
pci_write_config_byte(pdev, 0x5B, scr2 & ~0x01);
udelay(10); /* debounce */
/* Cable register now active */
pci_read_config_byte(pdev, 0x5A, &ata66);
/* Restore state */
pci_write_config_byte(pdev, 0x5B, scr2);
if (ata66 & (2 >> ap->port_no))
return ATA_CBL_PATA40;
else
return ATA_CBL_PATA80;
}
/**
* hpt3x2n_pre_reset - reset the hpt3x2n bus
* @link: ATA link to reset
* @deadline: deadline jiffies for the operation
*
* Perform the initial reset handling for the 3x2n series controllers.
* Reset the hardware and state machine,
*/
static int hpt3x2n_pre_reset(struct ata_link *link, unsigned long deadline)
{
struct ata_port *ap = link->ap;
struct pci_dev *pdev = to_pci_dev(ap->host->dev);
/* Reset the state machine */
pci_write_config_byte(pdev, 0x50 + 4 * ap->port_no, 0x37);
udelay(100);
return ata_sff_prereset(link, deadline);
}
/**
* hpt3x2n_set_piomode - PIO setup
* @ap: ATA interface
* @adev: device on the interface
*
* Perform PIO mode setup.
*/
static void hpt3x2n_set_piomode(struct ata_port *ap, struct ata_device *adev)
{
struct pci_dev *pdev = to_pci_dev(ap->host->dev);
u32 addr1, addr2;
u32 reg;
u32 mode;
u8 fast;
addr1 = 0x40 + 4 * (adev->devno + 2 * ap->port_no);
addr2 = 0x51 + 4 * ap->port_no;
/* Fast interrupt prediction disable, hold off interrupt disable */
pci_read_config_byte(pdev, addr2, &fast);
fast &= ~0x07;
pci_write_config_byte(pdev, addr2, fast);
pci_read_config_dword(pdev, addr1, &reg);
mode = hpt3x2n_find_mode(ap, adev->pio_mode);
mode &= 0xCFC3FFFF; /* Leave DMA bits alone */
reg &= ~0xCFC3FFFF; /* Strip timing bits */
pci_write_config_dword(pdev, addr1, reg | mode);
}
/**
* hpt3x2n_set_dmamode - DMA timing setup
* @ap: ATA interface
* @adev: Device being configured
*
* Set up the channel for MWDMA or UDMA modes. Much the same as with
* PIO, load the mode number and then set MWDMA or UDMA flag.
*/
static void hpt3x2n_set_dmamode(struct ata_port *ap, struct ata_device *adev)
{
struct pci_dev *pdev = to_pci_dev(ap->host->dev);
u32 addr1, addr2;
u32 reg, mode, mask;
u8 fast;
addr1 = 0x40 + 4 * (adev->devno + 2 * ap->port_no);
addr2 = 0x51 + 4 * ap->port_no;
/* Fast interrupt prediction disable, hold off interrupt disable */
pci_read_config_byte(pdev, addr2, &fast);
fast &= ~0x07;
pci_write_config_byte(pdev, addr2, fast);
mask = adev->dma_mode < XFER_UDMA_0 ? 0x31C001FF : 0x303C0000;
pci_read_config_dword(pdev, addr1, &reg);
mode = hpt3x2n_find_mode(ap, adev->dma_mode);
mode &= mask;
reg &= ~mask;
pci_write_config_dword(pdev, addr1, reg | mode);
}
/**
* hpt3x2n_bmdma_end - DMA engine stop
* @qc: ATA command
*
* Clean up after the HPT3x2n and later DMA engine
*/
static void hpt3x2n_bmdma_stop(struct ata_queued_cmd *qc)
{
struct ata_port *ap = qc->ap;
struct pci_dev *pdev = to_pci_dev(ap->host->dev);
int mscreg = 0x50 + 2 * ap->port_no;
u8 bwsr_stat, msc_stat;
pci_read_config_byte(pdev, 0x6A, &bwsr_stat);
pci_read_config_byte(pdev, mscreg, &msc_stat);
if (bwsr_stat & (1 << ap->port_no))
pci_write_config_byte(pdev, mscreg, msc_stat | 0x30);
ata_bmdma_stop(qc);
}
/**
* hpt3x2n_set_clock - clock control
* @ap: ATA port
* @source: 0x21 or 0x23 for PLL or PCI sourced clock
*
* Switch the ATA bus clock between the PLL and PCI clock sources
* while correctly isolating the bus and resetting internal logic
*
* We must use the DPLL for
* - writing
* - second channel UDMA7 (SATA ports) or higher
* - 66MHz PCI
*
* or we will underclock the device and get reduced performance.
*/
static void hpt3x2n_set_clock(struct ata_port *ap, int source)
{
void __iomem *bmdma = ap->ioaddr.bmdma_addr - ap->port_no * 8;
/* Tristate the bus */
iowrite8(0x80, bmdma+0x73);
iowrite8(0x80, bmdma+0x77);
/* Switch clock and reset channels */
iowrite8(source, bmdma+0x7B);
iowrite8(0xC0, bmdma+0x79);
/* Reset state machines, avoid enabling the disabled channels */
iowrite8(ioread8(bmdma+0x70) | 0x32, bmdma+0x70);
iowrite8(ioread8(bmdma+0x74) | 0x32, bmdma+0x74);
/* Complete reset */
iowrite8(0x00, bmdma+0x79);
/* Reconnect channels to bus */
iowrite8(0x00, bmdma+0x73);
iowrite8(0x00, bmdma+0x77);
}
static int hpt3x2n_use_dpll(struct ata_port *ap, int writing)
{
long flags = (long)ap->host->private_data;
/* See if we should use the DPLL */
if (writing)
return USE_DPLL; /* Needed for write */
if (flags & PCI66)
return USE_DPLL; /* Needed at 66Mhz */
return 0;
}
static int hpt3x2n_qc_defer(struct ata_queued_cmd *qc)
{
struct ata_port *ap = qc->ap;
struct ata_port *alt = ap->host->ports[ap->port_no ^ 1];
int rc, flags = (long)ap->host->private_data;
int dpll = hpt3x2n_use_dpll(ap, qc->tf.flags & ATA_TFLAG_WRITE);
/* First apply the usual rules */
rc = ata_std_qc_defer(qc);
if (rc != 0)
return rc;
if ((flags & USE_DPLL) != dpll && alt->qc_active)
return ATA_DEFER_PORT;
return 0;
}
static unsigned int hpt3x2n_qc_issue(struct ata_queued_cmd *qc)
{
struct ata_port *ap = qc->ap;
int flags = (long)ap->host->private_data;
int dpll = hpt3x2n_use_dpll(ap, qc->tf.flags & ATA_TFLAG_WRITE);
if ((flags & USE_DPLL) != dpll) {
flags &= ~USE_DPLL;
flags |= dpll;
ap->host->private_data = (void *)(long)flags;
hpt3x2n_set_clock(ap, dpll ? 0x21 : 0x23);
}
return ata_sff_qc_issue(qc);
}
static struct scsi_host_template hpt3x2n_sht = {
ATA_BMDMA_SHT(DRV_NAME),
};
/*
* Configuration for HPT3x2n.
*/
static struct ata_port_operations hpt3x2n_port_ops = {
.inherits = &ata_bmdma_port_ops,
.bmdma_stop = hpt3x2n_bmdma_stop,
.qc_defer = hpt3x2n_qc_defer,
.qc_issue = hpt3x2n_qc_issue,
.cable_detect = hpt3x2n_cable_detect,
.set_piomode = hpt3x2n_set_piomode,
.set_dmamode = hpt3x2n_set_dmamode,
.prereset = hpt3x2n_pre_reset,
};
/**
* hpt3xn_calibrate_dpll - Calibrate the DPLL loop
* @dev: PCI device
*
* Perform a calibration cycle on the HPT3xN DPLL. Returns 1 if this
* succeeds
*/
static int hpt3xn_calibrate_dpll(struct pci_dev *dev)
{
u8 reg5b;
u32 reg5c;
int tries;
for(tries = 0; tries < 0x5000; tries++) {
udelay(50);
pci_read_config_byte(dev, 0x5b, &reg5b);
if (reg5b & 0x80) {
/* See if it stays set */
for(tries = 0; tries < 0x1000; tries ++) {
pci_read_config_byte(dev, 0x5b, &reg5b);
/* Failed ? */
if ((reg5b & 0x80) == 0)
return 0;
}
/* Turn off tuning, we have the DPLL set */
pci_read_config_dword(dev, 0x5c, &reg5c);
pci_write_config_dword(dev, 0x5c, reg5c & ~ 0x100);
return 1;
}
}
/* Never went stable */
return 0;
}
static int hpt3x2n_pci_clock(struct pci_dev *pdev)
{
unsigned long freq;
u32 fcnt;
unsigned long iobase = pci_resource_start(pdev, 4);
fcnt = inl(iobase + 0x90); /* Not PCI readable for some chips */
if ((fcnt >> 12) != 0xABCDE) {
printk(KERN_WARNING "hpt3xn: BIOS clock data not set.\n");
return 33; /* Not BIOS set */
}
fcnt &= 0x1FF;
freq = (fcnt * 77) / 192;
/* Clamp to bands */
if (freq < 40)
return 33;
if (freq < 45)
return 40;
if (freq < 55)
return 50;
return 66;
}
/**
* hpt3x2n_init_one - Initialise an HPT37X/302
* @dev: PCI device
* @id: Entry in match table
*
* Initialise an HPT3x2n device. There are some interesting complications
* here. Firstly the chip may report 366 and be one of several variants.
* Secondly all the timings depend on the clock for the chip which we must
* detect and look up
*
* This is the known chip mappings. It may be missing a couple of later
* releases.
*
* Chip version PCI Rev Notes
* HPT372 4 (HPT366) 5 Other driver
* HPT372N 4 (HPT366) 6 UDMA133
* HPT372 5 (HPT372) 1 Other driver
* HPT372N 5 (HPT372) 2 UDMA133
* HPT302 6 (HPT302) * Other driver
* HPT302N 6 (HPT302) > 1 UDMA133
* HPT371 7 (HPT371) * Other driver
* HPT371N 7 (HPT371) > 1 UDMA133
* HPT374 8 (HPT374) * Other driver
* HPT372N 9 (HPT372N) * UDMA133
*
* (1) UDMA133 support depends on the bus clock
*
* To pin down HPT371N
*/
static int hpt3x2n_init_one(struct pci_dev *dev, const struct pci_device_id *id)
{
/* HPT372N and friends - UDMA133 */
static const struct ata_port_info info = {
.flags = ATA_FLAG_SLAVE_POSS,
.pio_mask = ATA_PIO4,
.mwdma_mask = ATA_MWDMA2,
.udma_mask = ATA_UDMA6,
.port_ops = &hpt3x2n_port_ops
};
const struct ata_port_info *ppi[] = { &info, NULL };
u8 rev = dev->revision;
u8 irqmask;
unsigned int pci_mhz;
unsigned int f_low, f_high;
int adjust;
unsigned long iobase = pci_resource_start(dev, 4);
void *hpriv = (void *)USE_DPLL;
int rc;
rc = pcim_enable_device(dev);
if (rc)
return rc;
switch(dev->device) {
case PCI_DEVICE_ID_TTI_HPT366:
if (rev < 6)
return -ENODEV;
break;
case PCI_DEVICE_ID_TTI_HPT371:
if (rev < 2)
return -ENODEV;
/* 371N if rev > 1 */
break;
case PCI_DEVICE_ID_TTI_HPT372:
/* 372N if rev >= 2*/
if (rev < 2)
return -ENODEV;
break;
case PCI_DEVICE_ID_TTI_HPT302:
if (rev < 2)
return -ENODEV;
break;
case PCI_DEVICE_ID_TTI_HPT372N:
break;
default:
printk(KERN_ERR "pata_hpt3x2n: PCI table is bogus please report (%d).\n", dev->device);
return -ENODEV;
}
/* Ok so this is a chip we support */
pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE, (L1_CACHE_BYTES / 4));
pci_write_config_byte(dev, PCI_LATENCY_TIMER, 0x78);
pci_write_config_byte(dev, PCI_MIN_GNT, 0x08);
pci_write_config_byte(dev, PCI_MAX_LAT, 0x08);
pci_read_config_byte(dev, 0x5A, &irqmask);
irqmask &= ~0x10;
pci_write_config_byte(dev, 0x5a, irqmask);
/*
* HPT371 chips physically have only one channel, the secondary one,
* but the primary channel registers do exist! Go figure...
* So, we manually disable the non-existing channel here
* (if the BIOS hasn't done this already).
*/
if (dev->device == PCI_DEVICE_ID_TTI_HPT371) {
u8 mcr1;
pci_read_config_byte(dev, 0x50, &mcr1);
mcr1 &= ~0x04;
pci_write_config_byte(dev, 0x50, mcr1);
}
/* Tune the PLL. HPT recommend using 75 for SATA, 66 for UDMA133 or
50 for UDMA100. Right now we always use 66 */
pci_mhz = hpt3x2n_pci_clock(dev);
f_low = (pci_mhz * 48) / 66; /* PCI Mhz for 66Mhz DPLL */
f_high = f_low + 2; /* Tolerance */
pci_write_config_dword(dev, 0x5C, (f_high << 16) | f_low | 0x100);
/* PLL clock */
pci_write_config_byte(dev, 0x5B, 0x21);
/* Unlike the 37x we don't try jiggling the frequency */
for(adjust = 0; adjust < 8; adjust++) {
if (hpt3xn_calibrate_dpll(dev))
break;
pci_write_config_dword(dev, 0x5C, (f_high << 16) | f_low);
}
if (adjust == 8) {
printk(KERN_ERR "pata_hpt3x2n: DPLL did not stabilize!\n");
return -ENODEV;
}
printk(KERN_INFO "pata_hpt37x: bus clock %dMHz, using 66MHz DPLL.\n",
pci_mhz);
/* Set our private data up. We only need a few flags so we use
it directly */
if (pci_mhz > 60) {
hpriv = (void *)(PCI66 | USE_DPLL);
/*
* On HPT371N, if ATA clock is 66 MHz we must set bit 2 in
* the MISC. register to stretch the UltraDMA Tss timing.
* NOTE: This register is only writeable via I/O space.
*/
if (dev->device == PCI_DEVICE_ID_TTI_HPT371)
outb(inb(iobase + 0x9c) | 0x04, iobase + 0x9c);
}
/* Now kick off ATA set up */
return ata_pci_sff_init_one(dev, ppi, &hpt3x2n_sht, hpriv);
}
static const struct pci_device_id hpt3x2n[] = {
{ PCI_VDEVICE(TTI, PCI_DEVICE_ID_TTI_HPT366), },
{ PCI_VDEVICE(TTI, PCI_DEVICE_ID_TTI_HPT371), },
{ PCI_VDEVICE(TTI, PCI_DEVICE_ID_TTI_HPT372), },
{ PCI_VDEVICE(TTI, PCI_DEVICE_ID_TTI_HPT302), },
{ PCI_VDEVICE(TTI, PCI_DEVICE_ID_TTI_HPT372N), },
{ },
};
static struct pci_driver hpt3x2n_pci_driver = {
.name = DRV_NAME,
.id_table = hpt3x2n,
.probe = hpt3x2n_init_one,
.remove = ata_pci_remove_one
};
static int __init hpt3x2n_init(void)
{
return pci_register_driver(&hpt3x2n_pci_driver);
}
static void __exit hpt3x2n_exit(void)
{
pci_unregister_driver(&hpt3x2n_pci_driver);
}
MODULE_AUTHOR("Alan Cox");
MODULE_DESCRIPTION("low-level driver for the Highpoint HPT3x2n/30x");
MODULE_LICENSE("GPL");
MODULE_DEVICE_TABLE(pci, hpt3x2n);
MODULE_VERSION(DRV_VERSION);
module_init(hpt3x2n_init);
module_exit(hpt3x2n_exit);
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