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acrn-kernel/drivers/ata/pata_hpt3x2n.c

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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
*
*
* TODO
* 371N
* 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"
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, 0x2c829d2c },
{ XFER_PIO_4, 0x0c829c62 },
{ XFER_PIO_3, 0x0c829c84 },
{ XFER_PIO_2, 0x0c829ca6 },
{ XFER_PIO_1, 0x0d029d26 },
{ XFER_PIO_0, 0x0d029d5e },
{ 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_pre_reset - reset the hpt3x2n bus
* @ap: ATA port to reset
*
* Perform the initial reset handling for the 3x2n series controllers.
* Reset the hardware and state machine, obtain the cable type.
*/
static int hpt3xn_pre_reset(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);
/* Cable register now active */
pci_read_config_byte(pdev, 0x5A, &ata66);
/* Restore state */
pci_write_config_byte(pdev, 0x5B, scr2);
if (ata66 & (1 << ap->port_no))
ap->cbl = ATA_CBL_PATA40;
else
ap->cbl = ATA_CBL_PATA80;
/* Reset the state machine */
pci_write_config_byte(pdev, 0x50, 0x37);
pci_write_config_byte(pdev, 0x54, 0x37);
udelay(100);
return ata_std_prereset(ap);
}
/**
* hpt3x2n_error_handler - probe the hpt3x2n bus
* @ap: ATA port to reset
*
* Perform the probe reset handling for the 3x2N
*/
static void hpt3x2n_error_handler(struct ata_port *ap)
{
ata_bmdma_drive_eh(ap, hpt3xn_pre_reset, ata_std_softreset, NULL, ata_std_postreset);
}
/**
* 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 &= ~0x8000000; /* No FIFO in PIO */
mode &= ~0x30070000; /* Leave config bits alone */
reg &= 0x30070000; /* 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;
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->dma_mode);
mode |= 0x8000000; /* FIFO in MWDMA or UDMA */
mode &= ~0xC0000000; /* Leave config bits alone */
reg &= 0xC0000000; /* Strip timing bits */
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)
{
unsigned long bmdma = ap->ioaddr.bmdma_addr;
/* Tristate the bus */
outb(0x80, bmdma+0x73);
outb(0x80, bmdma+0x77);
/* Switch clock and reset channels */
outb(source, bmdma+0x7B);
outb(0xC0, bmdma+0x79);
/* Reset state machines */
outb(0x37, bmdma+0x70);
outb(0x37, bmdma+0x74);
/* Complete reset */
outb(0x00, bmdma+0x79);
/* Reconnect channels to bus */
outb(0x00, bmdma+0x73);
outb(0x00, bmdma+0x77);
}
/* Check if our partner interface is busy */
static int hpt3x2n_pair_idle(struct ata_port *ap)
{
struct ata_host *host = ap->host;
struct ata_port *pair = host->ports[ap->port_no ^ 1];
if (pair->hsm_task_state == HSM_ST_IDLE)
return 1;
return 0;
}
static int hpt3x2n_use_dpll(struct ata_port *ap, int reading)
{
long flags = (long)ap->host->private_data;
/* See if we should use the DPLL */
if (reading == 0)
return USE_DPLL; /* Needed for write */
if (flags & PCI66)
return USE_DPLL; /* Needed at 66Mhz */
return 0;
}
static unsigned int hpt3x2n_qc_issue_prot(struct ata_queued_cmd *qc)
{
struct ata_taskfile *tf = &qc->tf;
struct ata_port *ap = qc->ap;
int flags = (long)ap->host->private_data;
if (hpt3x2n_pair_idle(ap)) {
int dpll = hpt3x2n_use_dpll(ap, (tf->flags & ATA_TFLAG_WRITE));
if ((flags & USE_DPLL) != dpll) {
if (dpll == 1)
hpt3x2n_set_clock(ap, 0x21);
else
hpt3x2n_set_clock(ap, 0x23);
}
}
return ata_qc_issue_prot(qc);
}
static struct scsi_host_template hpt3x2n_sht = {
.module = THIS_MODULE,
.name = DRV_NAME,
.ioctl = ata_scsi_ioctl,
.queuecommand = ata_scsi_queuecmd,
.can_queue = ATA_DEF_QUEUE,
.this_id = ATA_SHT_THIS_ID,
.sg_tablesize = LIBATA_MAX_PRD,
.max_sectors = ATA_MAX_SECTORS,
.cmd_per_lun = ATA_SHT_CMD_PER_LUN,
.emulated = ATA_SHT_EMULATED,
.use_clustering = ATA_SHT_USE_CLUSTERING,
.proc_name = DRV_NAME,
.dma_boundary = ATA_DMA_BOUNDARY,
.slave_configure = ata_scsi_slave_config,
.bios_param = ata_std_bios_param,
};
/*
* Configuration for HPT3x2n.
*/
static struct ata_port_operations hpt3x2n_port_ops = {
.port_disable = ata_port_disable,
.set_piomode = hpt3x2n_set_piomode,
.set_dmamode = hpt3x2n_set_dmamode,
.mode_filter = ata_pci_default_filter,
.tf_load = ata_tf_load,
.tf_read = ata_tf_read,
.check_status = ata_check_status,
.exec_command = ata_exec_command,
.dev_select = ata_std_dev_select,
.freeze = ata_bmdma_freeze,
.thaw = ata_bmdma_thaw,
.error_handler = hpt3x2n_error_handler,
.post_internal_cmd = ata_bmdma_post_internal_cmd,
.bmdma_setup = ata_bmdma_setup,
.bmdma_start = ata_bmdma_start,
.bmdma_stop = hpt3x2n_bmdma_stop,
.bmdma_status = ata_bmdma_status,
.qc_prep = ata_qc_prep,
.qc_issue = hpt3x2n_qc_issue_prot,
.data_xfer = ata_pio_data_xfer,
.irq_handler = ata_interrupt,
.irq_clear = ata_bmdma_irq_clear,
.port_start = ata_port_start,
.port_stop = ata_port_stop,
.host_stop = ata_host_stop
};
/**
* 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;
pci_read_config_dword(pdev, 0x70/*CHECKME*/, &fcnt);
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 struct ata_port_info info = {
.sht = &hpt3x2n_sht,
.flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
.pio_mask = 0x1f,
.mwdma_mask = 0x07,
.udma_mask = 0x7f,
.port_ops = &hpt3x2n_port_ops
};
struct ata_port_info *port_info[2];
struct ata_port_info *port = &info;
u8 irqmask;
u32 class_rev;
unsigned int pci_mhz;
unsigned int f_low, f_high;
int adjust;
pci_read_config_dword(dev, PCI_CLASS_REVISION, &class_rev);
class_rev &= 0xFF;
switch(dev->device) {
case PCI_DEVICE_ID_TTI_HPT366:
if (class_rev < 6)
return -ENODEV;
break;
case PCI_DEVICE_ID_TTI_HPT372:
/* 372N if rev >= 1*/
if (class_rev == 0)
return -ENODEV;
break;
case PCI_DEVICE_ID_TTI_HPT302:
if (class_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);
/* 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_WARNING "hpt3xn: DPLL did not stabilize.\n");
/* Set our private data up. We only need a few flags so we use
it directly */
port->private_data = NULL;
if (pci_mhz > 60)
port->private_data = (void *)PCI66;
/* Now kick off ATA set up */
port_info[0] = port_info[1] = port;
return ata_pci_init_one(dev, port_info, 2);
}
static struct pci_device_id hpt3x2n[] = {
{ PCI_DEVICE(PCI_VENDOR_ID_TTI, PCI_DEVICE_ID_TTI_HPT366), },
{ PCI_DEVICE(PCI_VENDOR_ID_TTI, PCI_DEVICE_ID_TTI_HPT372), },
{ PCI_DEVICE(PCI_VENDOR_ID_TTI, PCI_DEVICE_ID_TTI_HPT302), },
{ PCI_DEVICE(PCI_VENDOR_ID_TTI, PCI_DEVICE_ID_TTI_HPT372N), },
{ 0, },
};
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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