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linux/drivers/ide/cmd640.c
Sergei Shtylyov a9ddabc52c cmd640: fix kernel oops in test_irq() method 
When implementing the test_iqr() method, I forgot that this driver is not an
ordinary PCI driver and also needs to support VLB variant of the chip. Moreover,
'hwif->dev' should be NULL, potentially causing oops in pci_read_config_byte().

Signed-off-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2010-05-11 00:08:03 -07:00

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/*
* Copyright (C) 1995-1996 Linus Torvalds & authors (see below)
*/
/*
* Original authors: abramov@cecmow.enet.dec.com (Igor Abramov)
* mlord@pobox.com (Mark Lord)
*
* See linux/MAINTAINERS for address of current maintainer.
*
* This file provides support for the advanced features and bugs
* of IDE interfaces using the CMD Technologies 0640 IDE interface chip.
*
* These chips are basically fucked by design, and getting this driver
* to work on every motherboard design that uses this screwed chip seems
* bloody well impossible. However, we're still trying.
*
* Version 0.97 worked for everybody.
*
* User feedback is essential. Many thanks to the beta test team:
*
* A.Hartgers@stud.tue.nl, JZDQC@CUNYVM.CUNY.edu, abramov@cecmow.enet.dec.com,
* bardj@utopia.ppp.sn.no, bart@gaga.tue.nl, bbol001@cs.auckland.ac.nz,
* chrisc@dbass.demon.co.uk, dalecki@namu26.Num.Math.Uni-Goettingen.de,
* derekn@vw.ece.cmu.edu, florian@btp2x3.phy.uni-bayreuth.de,
* flynn@dei.unipd.it, gadio@netvision.net.il, godzilla@futuris.net,
* j@pobox.com, jkemp1@mises.uni-paderborn.de, jtoppe@hiwaay.net,
* kerouac@ssnet.com, meskes@informatik.rwth-aachen.de, hzoli@cs.elte.hu,
* peter@udgaard.isgtec.com, phil@tazenda.demon.co.uk, roadcapw@cfw.com,
* s0033las@sun10.vsz.bme.hu, schaffer@tam.cornell.edu, sjd@slip.net,
* steve@ei.org, ulrpeg@bigcomm.gun.de, ism@tardis.ed.ac.uk, mack@cray.com
* liug@mama.indstate.edu, and others.
*
* Version 0.01 Initial version, hacked out of ide.c,
* and #include'd rather than compiled separately.
* This will get cleaned up in a subsequent release.
*
* Version 0.02 Fixes for vlb initialization code, enable prefetch
* for versions 'B' and 'C' of chip by default,
* some code cleanup.
*
* Version 0.03 Added reset of secondary interface,
* and black list for devices which are not compatible
* with prefetch mode. Separate function for setting
* prefetch is added, possibly it will be called some
* day from ioctl processing code.
*
* Version 0.04 Now configs/compiles separate from ide.c
*
* Version 0.05 Major rewrite of interface timing code.
* Added new function cmd640_set_mode to set PIO mode
* from ioctl call. New drives added to black list.
*
* Version 0.06 More code cleanup. Prefetch is enabled only for
* detected hard drives, not included in prefetch
* black list.
*
* Version 0.07 Changed to more conservative drive tuning policy.
* Unknown drives, which report PIO < 4 are set to
* (reported_PIO - 1) if it is supported, or to PIO0.
* List of known drives extended by info provided by
* CMD at their ftp site.
*
* Version 0.08 Added autotune/noautotune support.
*
* Version 0.09 Try to be smarter about 2nd port enabling.
* Version 0.10 Be nice and don't reset 2nd port.
* Version 0.11 Try to handle more weird situations.
*
* Version 0.12 Lots of bug fixes from Laszlo Peter
* irq unmasking disabled for reliability.
* try to be even smarter about the second port.
* tidy up source code formatting.
* Version 0.13 permit irq unmasking again.
* Version 0.90 massive code cleanup, some bugs fixed.
* defaults all drives to PIO mode0, prefetch off.
* autotune is OFF by default, with compile time flag.
* prefetch can be turned OFF/ON using "hdparm -p8/-p9"
* (requires hdparm-3.1 or newer)
* Version 0.91 first release to linux-kernel list.
* Version 0.92 move initial reg dump to separate callable function
* change "readahead" to "prefetch" to avoid confusion
* Version 0.95 respect original BIOS timings unless autotuning.
* tons of code cleanup and rearrangement.
* added CONFIG_BLK_DEV_CMD640_ENHANCED option
* prevent use of unmask when prefetch is on
* Version 0.96 prevent use of io_32bit when prefetch is off
* Version 0.97 fix VLB secondary interface for sjd@slip.net
* other minor tune-ups: 0.96 was very good.
* Version 0.98 ignore PCI version when disabled by BIOS
* Version 0.99 display setup/active/recovery clocks with PIO mode
* Version 1.00 Mmm.. cannot depend on PCMD_ENA in all systems
* Version 1.01 slow/fast devsel can be selected with "hdparm -p6/-p7"
* ("fast" is necessary for 32bit I/O in some systems)
* Version 1.02 fix bug that resulted in slow "setup times"
* (patch courtesy of Zoltan Hidvegi)
*/
#define CMD640_PREFETCH_MASKS 1
/*#define CMD640_DUMP_REGS */
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/ide.h>
#include <linux/init.h>
#include <asm/io.h>
#define DRV_NAME "cmd640"
static int cmd640_vlb;
/*
* CMD640 specific registers definition.
*/
#define VID 0x00
#define DID 0x02
#define PCMD 0x04
#define PCMD_ENA 0x01
#define PSTTS 0x06
#define REVID 0x08
#define PROGIF 0x09
#define SUBCL 0x0a
#define BASCL 0x0b
#define BaseA0 0x10
#define BaseA1 0x14
#define BaseA2 0x18
#define BaseA3 0x1c
#define INTLINE 0x3c
#define INPINE 0x3d
#define CFR 0x50
#define CFR_DEVREV 0x03
#define CFR_IDE01INTR 0x04
#define CFR_DEVID 0x18
#define CFR_AT_VESA_078h 0x20
#define CFR_DSA1 0x40
#define CFR_DSA0 0x80
#define CNTRL 0x51
#define CNTRL_DIS_RA0 0x40
#define CNTRL_DIS_RA1 0x80
#define CNTRL_ENA_2ND 0x08
#define CMDTIM 0x52
#define ARTTIM0 0x53
#define DRWTIM0 0x54
#define ARTTIM1 0x55
#define DRWTIM1 0x56
#define ARTTIM23 0x57
#define ARTTIM23_DIS_RA2 0x04
#define ARTTIM23_DIS_RA3 0x08
#define ARTTIM23_IDE23INTR 0x10
#define DRWTIM23 0x58
#define BRST 0x59
/*
* Registers and masks for easy access by drive index:
*/
static u8 prefetch_regs[4] = {CNTRL, CNTRL, ARTTIM23, ARTTIM23};
static u8 prefetch_masks[4] = {CNTRL_DIS_RA0, CNTRL_DIS_RA1, ARTTIM23_DIS_RA2, ARTTIM23_DIS_RA3};
#ifdef CONFIG_BLK_DEV_CMD640_ENHANCED
static u8 arttim_regs[4] = {ARTTIM0, ARTTIM1, ARTTIM23, ARTTIM23};
static u8 drwtim_regs[4] = {DRWTIM0, DRWTIM1, DRWTIM23, DRWTIM23};
/*
* Current cmd640 timing values for each drive.
* The defaults for each are the slowest possible timings.
*/
static u8 setup_counts[4] = {4, 4, 4, 4}; /* Address setup count (in clocks) */
static u8 active_counts[4] = {16, 16, 16, 16}; /* Active count (encoded) */
static u8 recovery_counts[4] = {16, 16, 16, 16}; /* Recovery count (encoded) */
#endif /* CONFIG_BLK_DEV_CMD640_ENHANCED */
static DEFINE_SPINLOCK(cmd640_lock);
/*
* Interface to access cmd640x registers
*/
static unsigned int cmd640_key;
static void (*__put_cmd640_reg)(u16 reg, u8 val);
static u8 (*__get_cmd640_reg)(u16 reg);
/*
* This is read from the CFR reg, and is used in several places.
*/
static unsigned int cmd640_chip_version;
/*
* The CMD640x chip does not support DWORD config write cycles, but some
* of the BIOSes use them to implement the config services.
* Therefore, we must use direct IO instead.
*/
/* PCI method 1 access */
static void put_cmd640_reg_pci1(u16 reg, u8 val)
{
outl_p((reg & 0xfc) | cmd640_key, 0xcf8);
outb_p(val, (reg & 3) | 0xcfc);
}
static u8 get_cmd640_reg_pci1(u16 reg)
{
outl_p((reg & 0xfc) | cmd640_key, 0xcf8);
return inb_p((reg & 3) | 0xcfc);
}
/* PCI method 2 access (from CMD datasheet) */
static void put_cmd640_reg_pci2(u16 reg, u8 val)
{
outb_p(0x10, 0xcf8);
outb_p(val, cmd640_key + reg);
outb_p(0, 0xcf8);
}
static u8 get_cmd640_reg_pci2(u16 reg)
{
u8 b;
outb_p(0x10, 0xcf8);
b = inb_p(cmd640_key + reg);
outb_p(0, 0xcf8);
return b;
}
/* VLB access */
static void put_cmd640_reg_vlb(u16 reg, u8 val)
{
outb_p(reg, cmd640_key);
outb_p(val, cmd640_key + 4);
}
static u8 get_cmd640_reg_vlb(u16 reg)
{
outb_p(reg, cmd640_key);
return inb_p(cmd640_key + 4);
}
static u8 get_cmd640_reg(u16 reg)
{
unsigned long flags;
u8 b;
spin_lock_irqsave(&cmd640_lock, flags);
b = __get_cmd640_reg(reg);
spin_unlock_irqrestore(&cmd640_lock, flags);
return b;
}
static void put_cmd640_reg(u16 reg, u8 val)
{
unsigned long flags;
spin_lock_irqsave(&cmd640_lock, flags);
__put_cmd640_reg(reg, val);
spin_unlock_irqrestore(&cmd640_lock, flags);
}
static int __init match_pci_cmd640_device(void)
{
const u8 ven_dev[4] = {0x95, 0x10, 0x40, 0x06};
unsigned int i;
for (i = 0; i < 4; i++) {
if (get_cmd640_reg(i) != ven_dev[i])
return 0;
}
#ifdef STUPIDLY_TRUST_BROKEN_PCMD_ENA_BIT
if ((get_cmd640_reg(PCMD) & PCMD_ENA) == 0) {
printk("ide: cmd640 on PCI disabled by BIOS\n");
return 0;
}
#endif /* STUPIDLY_TRUST_BROKEN_PCMD_ENA_BIT */
return 1; /* success */
}
/*
* Probe for CMD640x -- pci method 1
*/
static int __init probe_for_cmd640_pci1(void)
{
__get_cmd640_reg = get_cmd640_reg_pci1;
__put_cmd640_reg = put_cmd640_reg_pci1;
for (cmd640_key = 0x80000000;
cmd640_key <= 0x8000f800;
cmd640_key += 0x800) {
if (match_pci_cmd640_device())
return 1; /* success */
}
return 0;
}
/*
* Probe for CMD640x -- pci method 2
*/
static int __init probe_for_cmd640_pci2(void)
{
__get_cmd640_reg = get_cmd640_reg_pci2;
__put_cmd640_reg = put_cmd640_reg_pci2;
for (cmd640_key = 0xc000; cmd640_key <= 0xcf00; cmd640_key += 0x100) {
if (match_pci_cmd640_device())
return 1; /* success */
}
return 0;
}
/*
* Probe for CMD640x -- vlb
*/
static int __init probe_for_cmd640_vlb(void)
{
u8 b;
__get_cmd640_reg = get_cmd640_reg_vlb;
__put_cmd640_reg = put_cmd640_reg_vlb;
cmd640_key = 0x178;
b = get_cmd640_reg(CFR);
if (b == 0xff || b == 0x00 || (b & CFR_AT_VESA_078h)) {
cmd640_key = 0x78;
b = get_cmd640_reg(CFR);
if (b == 0xff || b == 0x00 || !(b & CFR_AT_VESA_078h))
return 0;
}
return 1; /* success */
}
/*
* Returns 1 if an IDE interface/drive exists at 0x170,
* Returns 0 otherwise.
*/
static int __init secondary_port_responding(void)
{
unsigned long flags;
spin_lock_irqsave(&cmd640_lock, flags);
outb_p(0x0a, 0x176); /* select drive0 */
udelay(100);
if ((inb_p(0x176) & 0x1f) != 0x0a) {
outb_p(0x1a, 0x176); /* select drive1 */
udelay(100);
if ((inb_p(0x176) & 0x1f) != 0x1a) {
spin_unlock_irqrestore(&cmd640_lock, flags);
return 0; /* nothing responded */
}
}
spin_unlock_irqrestore(&cmd640_lock, flags);
return 1; /* success */
}
#ifdef CMD640_DUMP_REGS
/*
* Dump out all cmd640 registers. May be called from ide.c
*/
static void cmd640_dump_regs(void)
{
unsigned int reg = cmd640_vlb ? 0x50 : 0x00;
/* Dump current state of chip registers */
printk("ide: cmd640 internal register dump:");
for (; reg <= 0x59; reg++) {
if (!(reg & 0x0f))
printk("\n%04x:", reg);
printk(" %02x", get_cmd640_reg(reg));
}
printk("\n");
}
#endif
static void __set_prefetch_mode(ide_drive_t *drive, int mode)
{
if (mode) { /* want prefetch on? */
#if CMD640_PREFETCH_MASKS
drive->dev_flags |= IDE_DFLAG_NO_UNMASK;
drive->dev_flags &= ~IDE_DFLAG_UNMASK;
#endif
drive->dev_flags &= ~IDE_DFLAG_NO_IO_32BIT;
} else {
drive->dev_flags &= ~IDE_DFLAG_NO_UNMASK;
drive->dev_flags |= IDE_DFLAG_NO_IO_32BIT;
drive->io_32bit = 0;
}
}
#ifndef CONFIG_BLK_DEV_CMD640_ENHANCED
/*
* Check whether prefetch is on for a drive,
* and initialize the unmask flags for safe operation.
*/
static void __init check_prefetch(ide_drive_t *drive, unsigned int index)
{
u8 b = get_cmd640_reg(prefetch_regs[index]);
__set_prefetch_mode(drive, (b & prefetch_masks[index]) ? 0 : 1);
}
#else
/*
* Sets prefetch mode for a drive.
*/
static void set_prefetch_mode(ide_drive_t *drive, unsigned int index, int mode)
{
unsigned long flags;
int reg = prefetch_regs[index];
u8 b;
spin_lock_irqsave(&cmd640_lock, flags);
b = __get_cmd640_reg(reg);
__set_prefetch_mode(drive, mode);
if (mode)
b &= ~prefetch_masks[index]; /* enable prefetch */
else
b |= prefetch_masks[index]; /* disable prefetch */
__put_cmd640_reg(reg, b);
spin_unlock_irqrestore(&cmd640_lock, flags);
}
/*
* Dump out current drive clocks settings
*/
static void display_clocks(unsigned int index)
{
u8 active_count, recovery_count;
active_count = active_counts[index];
if (active_count == 1)
++active_count;
recovery_count = recovery_counts[index];
if (active_count > 3 && recovery_count == 1)
++recovery_count;
if (cmd640_chip_version > 1)
recovery_count += 1; /* cmd640b uses (count + 1)*/
printk(", clocks=%d/%d/%d\n", setup_counts[index], active_count, recovery_count);
}
/*
* Pack active and recovery counts into single byte representation
* used by controller
*/
static inline u8 pack_nibbles(u8 upper, u8 lower)
{
return ((upper & 0x0f) << 4) | (lower & 0x0f);
}
/*
* This routine writes the prepared setup/active/recovery counts
* for a drive into the cmd640 chipset registers to active them.
*/
static void program_drive_counts(ide_drive_t *drive, unsigned int index)
{
unsigned long flags;
u8 setup_count = setup_counts[index];
u8 active_count = active_counts[index];
u8 recovery_count = recovery_counts[index];
/*
* Set up address setup count and drive read/write timing registers.
* Primary interface has individual count/timing registers for
* each drive. Secondary interface has one common set of registers,
* so we merge the timings, using the slowest value for each timing.
*/
if (index > 1) {
ide_drive_t *peer = ide_get_pair_dev(drive);
unsigned int mate = index ^ 1;
if (peer) {
if (setup_count < setup_counts[mate])
setup_count = setup_counts[mate];
if (active_count < active_counts[mate])
active_count = active_counts[mate];
if (recovery_count < recovery_counts[mate])
recovery_count = recovery_counts[mate];
}
}
/*
* Convert setup_count to internal chipset representation
*/
switch (setup_count) {
case 4: setup_count = 0x00; break;
case 3: setup_count = 0x80; break;
case 1:
case 2: setup_count = 0x40; break;
default: setup_count = 0xc0; /* case 5 */
}
/*
* Now that everything is ready, program the new timings
*/
spin_lock_irqsave(&cmd640_lock, flags);
/*
* Program the address_setup clocks into ARTTIM reg,
* and then the active/recovery counts into the DRWTIM reg
* (this converts counts of 16 into counts of zero -- okay).
*/
setup_count |= __get_cmd640_reg(arttim_regs[index]) & 0x3f;
__put_cmd640_reg(arttim_regs[index], setup_count);
__put_cmd640_reg(drwtim_regs[index], pack_nibbles(active_count, recovery_count));
spin_unlock_irqrestore(&cmd640_lock, flags);
}
/*
* Set a specific pio_mode for a drive
*/
static void cmd640_set_mode(ide_drive_t *drive, unsigned int index,
u8 pio_mode, unsigned int cycle_time)
{
struct ide_timing *t;
int setup_time, active_time, recovery_time, clock_time;
u8 setup_count, active_count, recovery_count, recovery_count2, cycle_count;
int bus_speed;
if (cmd640_vlb)
bus_speed = ide_vlb_clk ? ide_vlb_clk : 50;
else
bus_speed = ide_pci_clk ? ide_pci_clk : 33;
if (pio_mode > 5)
pio_mode = 5;
t = ide_timing_find_mode(XFER_PIO_0 + pio_mode);
setup_time = t->setup;
active_time = t->active;
recovery_time = cycle_time - (setup_time + active_time);
clock_time = 1000 / bus_speed;
cycle_count = DIV_ROUND_UP(cycle_time, clock_time);
setup_count = DIV_ROUND_UP(setup_time, clock_time);
active_count = DIV_ROUND_UP(active_time, clock_time);
if (active_count < 2)
active_count = 2; /* minimum allowed by cmd640 */
recovery_count = DIV_ROUND_UP(recovery_time, clock_time);
recovery_count2 = cycle_count - (setup_count + active_count);
if (recovery_count2 > recovery_count)
recovery_count = recovery_count2;
if (recovery_count < 2)
recovery_count = 2; /* minimum allowed by cmd640 */
if (recovery_count > 17) {
active_count += recovery_count - 17;
recovery_count = 17;
}
if (active_count > 16)
active_count = 16; /* maximum allowed by cmd640 */
if (cmd640_chip_version > 1)
recovery_count -= 1; /* cmd640b uses (count + 1)*/
if (recovery_count > 16)
recovery_count = 16; /* maximum allowed by cmd640 */
setup_counts[index] = setup_count;
active_counts[index] = active_count;
recovery_counts[index] = recovery_count;
/*
* In a perfect world, we might set the drive pio mode here
* (using WIN_SETFEATURE) before continuing.
*
* But we do not, because:
* 1) this is the wrong place to do it (proper is do_special() in ide.c)
* 2) in practice this is rarely, if ever, necessary
*/
program_drive_counts(drive, index);
}
static void cmd640_set_pio_mode(ide_hwif_t *hwif, ide_drive_t *drive)
{
unsigned int index = 0, cycle_time;
const u8 pio = drive->pio_mode - XFER_PIO_0;
u8 b;
switch (pio) {
case 6: /* set fast-devsel off */
case 7: /* set fast-devsel on */
b = get_cmd640_reg(CNTRL) & ~0x27;
if (pio & 1)
b |= 0x27;
put_cmd640_reg(CNTRL, b);
printk("%s: %sabled cmd640 fast host timing (devsel)\n",
drive->name, (pio & 1) ? "en" : "dis");
return;
case 8: /* set prefetch off */
case 9: /* set prefetch on */
set_prefetch_mode(drive, index, pio & 1);
printk("%s: %sabled cmd640 prefetch\n",
drive->name, (pio & 1) ? "en" : "dis");
return;
}
cycle_time = ide_pio_cycle_time(drive, pio);
cmd640_set_mode(drive, index, pio, cycle_time);
printk("%s: selected cmd640 PIO mode%d (%dns)",
drive->name, pio, cycle_time);
display_clocks(index);
}
#endif /* CONFIG_BLK_DEV_CMD640_ENHANCED */
static void __init cmd640_init_dev(ide_drive_t *drive)
{
unsigned int i = drive->hwif->channel * 2 + (drive->dn & 1);
#ifdef CONFIG_BLK_DEV_CMD640_ENHANCED
/*
* Reset timing to the slowest speed and turn off prefetch.
* This way, the drive identify code has a better chance.
*/
setup_counts[i] = 4; /* max possible */
active_counts[i] = 16; /* max possible */
recovery_counts[i] = 16; /* max possible */
program_drive_counts(drive, i);
set_prefetch_mode(drive, i, 0);
printk(KERN_INFO DRV_NAME ": drive%d timings/prefetch cleared\n", i);
#else
/*
* Set the drive unmask flags to match the prefetch setting.
*/
check_prefetch(drive, i);
printk(KERN_INFO DRV_NAME ": drive%d timings/prefetch(%s) preserved\n",
i, (drive->dev_flags & IDE_DFLAG_NO_IO_32BIT) ? "off" : "on");
#endif /* CONFIG_BLK_DEV_CMD640_ENHANCED */
}
static int cmd640_test_irq(ide_hwif_t *hwif)
{
int irq_reg = hwif->channel ? ARTTIM23 : CFR;
u8 irq_mask = hwif->channel ? ARTTIM23_IDE23INTR :
CFR_IDE01INTR;
u8 irq_stat = get_cmd640_reg(irq_reg);
return (irq_stat & irq_mask) ? 1 : 0;
}
static const struct ide_port_ops cmd640_port_ops = {
.init_dev = cmd640_init_dev,
#ifdef CONFIG_BLK_DEV_CMD640_ENHANCED
.set_pio_mode = cmd640_set_pio_mode,
#endif
.test_irq = cmd640_test_irq,
};
static int pci_conf1(void)
{
unsigned long flags;
u32 tmp;
spin_lock_irqsave(&cmd640_lock, flags);
outb(0x01, 0xCFB);
tmp = inl(0xCF8);
outl(0x80000000, 0xCF8);
if (inl(0xCF8) == 0x80000000) {
outl(tmp, 0xCF8);
spin_unlock_irqrestore(&cmd640_lock, flags);
return 1;
}
outl(tmp, 0xCF8);
spin_unlock_irqrestore(&cmd640_lock, flags);
return 0;
}
static int pci_conf2(void)
{
unsigned long flags;
spin_lock_irqsave(&cmd640_lock, flags);
outb(0x00, 0xCFB);
outb(0x00, 0xCF8);
outb(0x00, 0xCFA);
if (inb(0xCF8) == 0x00 && inb(0xCF8) == 0x00) {
spin_unlock_irqrestore(&cmd640_lock, flags);
return 1;
}
spin_unlock_irqrestore(&cmd640_lock, flags);
return 0;
}
static const struct ide_port_info cmd640_port_info __initdata = {
.chipset = ide_cmd640,
.host_flags = IDE_HFLAG_SERIALIZE |
IDE_HFLAG_NO_DMA |
IDE_HFLAG_ABUSE_PREFETCH |
IDE_HFLAG_ABUSE_FAST_DEVSEL,
.port_ops = &cmd640_port_ops,
.pio_mask = ATA_PIO5,
};
static int cmd640x_init_one(unsigned long base, unsigned long ctl)
{
if (!request_region(base, 8, DRV_NAME)) {
printk(KERN_ERR "%s: I/O resource 0x%lX-0x%lX not free.\n",
DRV_NAME, base, base + 7);
return -EBUSY;
}
if (!request_region(ctl, 1, DRV_NAME)) {
printk(KERN_ERR "%s: I/O resource 0x%lX not free.\n",
DRV_NAME, ctl);
release_region(base, 8);
return -EBUSY;
}
return 0;
}
/*
* Probe for a cmd640 chipset, and initialize it if found.
*/
static int __init cmd640x_init(void)
{
int second_port_cmd640 = 0, rc;
const char *bus_type, *port2;
u8 b, cfr;
struct ide_hw hw[2], *hws[2];
if (cmd640_vlb && probe_for_cmd640_vlb()) {
bus_type = "VLB";
} else {
cmd640_vlb = 0;
/* Find out what kind of PCI probing is supported otherwise
Justin Gibbs will sulk.. */
if (pci_conf1() && probe_for_cmd640_pci1())
bus_type = "PCI (type1)";
else if (pci_conf2() && probe_for_cmd640_pci2())
bus_type = "PCI (type2)";
else
return 0;
}
/*
* Undocumented magic (there is no 0x5b reg in specs)
*/
put_cmd640_reg(0x5b, 0xbd);
if (get_cmd640_reg(0x5b) != 0xbd) {
printk(KERN_ERR "ide: cmd640 init failed: wrong value in reg 0x5b\n");
return 0;
}
put_cmd640_reg(0x5b, 0);
#ifdef CMD640_DUMP_REGS
cmd640_dump_regs();
#endif
/*
* Documented magic begins here
*/
cfr = get_cmd640_reg(CFR);
cmd640_chip_version = cfr & CFR_DEVREV;
if (cmd640_chip_version == 0) {
printk("ide: bad cmd640 revision: %d\n", cmd640_chip_version);
return 0;
}
rc = cmd640x_init_one(0x1f0, 0x3f6);
if (rc)
return rc;
rc = cmd640x_init_one(0x170, 0x376);
if (rc) {
release_region(0x3f6, 1);
release_region(0x1f0, 8);
return rc;
}
memset(&hw, 0, sizeof(hw));
ide_std_init_ports(&hw[0], 0x1f0, 0x3f6);
hw[0].irq = 14;
ide_std_init_ports(&hw[1], 0x170, 0x376);
hw[1].irq = 15;
printk(KERN_INFO "cmd640: buggy cmd640%c interface on %s, config=0x%02x"
"\n", 'a' + cmd640_chip_version - 1, bus_type, cfr);
/*
* Initialize data for primary port
*/
hws[0] = &hw[0];
/*
* Ensure compatibility by always using the slowest timings
* for access to the drive's command register block,
* and reset the prefetch burstsize to default (512 bytes).
*
* Maybe we need a way to NOT do these on *some* systems?
*/
put_cmd640_reg(CMDTIM, 0);
put_cmd640_reg(BRST, 0x40);
b = get_cmd640_reg(CNTRL);
/*
* Try to enable the secondary interface, if not already enabled
*/
if (secondary_port_responding()) {
if ((b & CNTRL_ENA_2ND)) {
second_port_cmd640 = 1;
port2 = "okay";
} else if (cmd640_vlb) {
second_port_cmd640 = 1;
port2 = "alive";
} else
port2 = "not cmd640";
} else {
put_cmd640_reg(CNTRL, b ^ CNTRL_ENA_2ND); /* toggle the bit */
if (secondary_port_responding()) {
second_port_cmd640 = 1;
port2 = "enabled";
} else {
put_cmd640_reg(CNTRL, b); /* restore original setting */
port2 = "not responding";
}
}
/*
* Initialize data for secondary cmd640 port, if enabled
*/
if (second_port_cmd640)
hws[1] = &hw[1];
printk(KERN_INFO "cmd640: %sserialized, secondary interface %s\n",
second_port_cmd640 ? "" : "not ", port2);
#ifdef CMD640_DUMP_REGS
cmd640_dump_regs();
#endif
return ide_host_add(&cmd640_port_info, hws, second_port_cmd640 ? 2 : 1,
NULL);
}
module_param_named(probe_vlb, cmd640_vlb, bool, 0);
MODULE_PARM_DESC(probe_vlb, "probe for VLB version of CMD640 chipset");
module_init(cmd640x_init);
MODULE_LICENSE("GPL");
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