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Date: Wed, 08 Feb 2012 11:48:21 -0600 (CST)
From: Aaron Sierra <asierra@...-inc.com>
To: guenter roeck <guenter.roeck@...csson.com>
Cc: Jean Delvare <khali@...ux-fr.org>,
Grant Likely <grant.likely@...retlab.ca>,
LKML <linux-kernel@...r.kernel.org>,
Peter Tyser <ptyser@...-inc.com>
Subject: Re: [PATCH 3/3 v2] watchdog: Convert iTCO_wdt driver to mfd model
> > @@ -429,11 +463,52 @@ static int __devinit lpc_ich_probe(struct
> > pci_dev *dev,
> > acpi_conflict++;
> > }
> >
> > + wdt_io_res(ICH_RES_IO_TCO)->start = base_addr +
> > ACPIBASE_TCO_OFF;
> > + wdt_io_res(ICH_RES_IO_TCO)->end = base_addr +
> > ACPIBASE_TCO_END;
> > + ret =
> > acpi_check_resource_conflict(wdt_io_res(ICH_RES_IO_TCO));
> > + if (ret) {
> > + acpi_conflict++;
> > + goto pm_done;
> > + }
> > +
> > + wdt_io_res(ICH_RES_IO_SMI)->start = base_addr +
> > ACPIBASE_SMI_OFF;
> > + wdt_io_res(ICH_RES_IO_SMI)->end = base_addr +
> > ACPIBASE_SMI_END;
> > + ret =
> > acpi_check_resource_conflict(wdt_io_res(ICH_RES_IO_SMI));
> > + if (ret) {
> > + acpi_conflict++;
> > + goto pm_done;
> > + }
> > +
> I'll have to look into the merged code, but doesn't this mean that
> iTCO resource requirement conflicts impact GPIO resource
> requirements ? If yes, is it possible to keep those separate ?
I believe that I accounted for this properly. I attempt to assign
the GPE0 resource before the iTCO resources. That way an ACPI
conflict with the iTCO resources can't cause the GPE0 resource to not
be assigned.
> > +static int __devinit iTCO_wdt_probe(struct platform_device *dev)
> > {
> > int ret;
> > - u32 base_address;
> > - unsigned long RCBA;
> > unsigned long val32;
> > + struct lpc_ich_info *ich_info = dev->dev.platform_data;
> >
> > - /*
> > - * Find the ACPI/PM base I/O address which is the base
> > - * for the TCO registers (TCOBASE=ACPIBASE + 0x60)
> > - * ACPIBASE is bits [15:7] from 0x40-0x43
> > - */
> > - pci_read_config_dword(pdev, 0x40, &base_address);
> > - base_address &= 0x0000ff80;
> > - if (base_address == 0x00000000) {
> > - /* Something's wrong here, ACPIBASE has to be set
> > */
> > - printk(KERN_ERR PFX "failed to get TCOBASE address,
> > "
> > - "device disabled by
> > hardware/BIOS\n");
> > + if (!ich_info)
> > + return -ENODEV;
> > +
> > + spin_lock_init(&iTCO_wdt_private.io_lock);
> > +
> > + iTCO_wdt_private.tco_res =
> > + platform_get_resource(dev, IORESOURCE_IO,
> > ICH_RES_IO_TCO);
> > +
> > + iTCO_wdt_private.smi_res =
> > + platform_get_resource(dev, IORESOURCE_IO,
> > ICH_RES_IO_SMI);
> > +
> > + iTCO_wdt_private.gcs_res =
> > + platform_get_resource(dev, IORESOURCE_MEM,
> > ICH_RES_MEM_GCS);
> > +
> > + if (!iTCO_wdt_private.tco_res || !iTCO_wdt_private.smi_res
> > ||
> > + !iTCO_wdt_private.gcs_res) {
> > + pr_info("No device detected.\n");
> > return -ENODEV;
This test and return doesn't account for any of the resources that may
have been successfully obtained.
> > }
> > - iTCO_wdt_private.iTCO_version =
> > -
> > iTCO_chipset_info[ent->driver_data].iTCO_version;
> > - iTCO_wdt_private.ACPIBASE = base_address;
> > - iTCO_wdt_private.pdev = pdev;
> > -
> > - /* Get the Memory-Mapped GCS register, we need it for the
> > - NO_REBOOT flag (TCO v2). To get access to it you have to
> > - read RCBA from PCI Config space 0xf0 and use it as base.
> > - GCS = RCBA + ICH6_GCS(0x3410). */
> > +
> > + iTCO_wdt_private.iTCO_version = ich_info->iTCO_version;
> > + iTCO_wdt_private.dev = dev;
> > + iTCO_wdt_private.pdev = to_pci_dev(dev->dev.parent);
> > +
> > + /*
> > + * Get the Memory-Mapped GCS register, we need it for the
> > + * NO_REBOOT flag (TCO v2).
> > + */
> > if (iTCO_wdt_private.iTCO_version == 2) {
> > - pci_read_config_dword(pdev, 0xf0, &base_address);
> > - if ((base_address & 1) == 0) {
> > - printk(KERN_ERR PFX "RCBA is disabled by
> > hardware"
> > - "/BIOS, device
> > disabled\n");
> > - ret = -ENODEV;
> > + if
> > (!request_mem_region(iTCO_wdt_private.gcs_res->start,
> > + resource_size(iTCO_wdt_private.gcs_res),
> > dev->name)) {
> > + ret = -EBUSY;
> > goto out;
> > }
> > - RCBA = base_address & 0xffffc000;
> > - iTCO_wdt_private.gcs = ioremap((RCBA + 0x3410), 4);
> > + iTCO_wdt_private.gcs =
> > ioremap(iTCO_wdt_private.gcs_res->start,
> > + resource_size(iTCO_wdt_private.gcs_res));
> > }
> >
> > /* Check chipset's NO_REBOOT bit */
> > if (iTCO_wdt_unset_NO_REBOOT_bit() &&
> > iTCO_vendor_check_noreboot_on()) {
> > - printk(KERN_INFO PFX "unable to reset NO_REBOOT
> > flag, "
> > + pr_info("unable to reset NO_REBOOT flag, "
> > "device disabled by
> > hardware/BIOS\n");
> > ret = -ENODEV; /* Cannot reset NO_REBOOT bit */
> > goto out_unmap;
> > @@ -841,11 +559,11 @@ static int __devinit iTCO_wdt_init(struct
> > pci_dev *pdev,
> > iTCO_wdt_set_NO_REBOOT_bit();
> >
> > /* The TCO logic uses the TCO_EN bit in the SMI_EN register
> > */
> > - if (!request_region(SMI_EN, 4, "iTCO_wdt")) {
> > - printk(KERN_ERR PFX
> > - "I/O address 0x%04lx already in use, "
> > + if (!request_region(iTCO_wdt_private.smi_res->start,
> > + resource_size(iTCO_wdt_private.smi_res),
> > dev->name)) {
> > + pr_err("I/O address 0x%04llx already in use, "
> > "device
> > disabled\n",
> > SMI_EN);
> > - ret = -EIO;
> > + ret = -EBUSY;
> > goto out_unmap;
> > }
> > if (turn_SMI_watchdog_clear_off >=
> > iTCO_wdt_private.iTCO_version) {
> > @@ -855,20 +573,16 @@ static int __devinit iTCO_wdt_init(struct
> > pci_dev *pdev,
> > outl(val32, SMI_EN);
> > }
> >
> > - /* The TCO I/O registers reside in a 32-byte range pointed
> > to
> > - by the TCOBASE value */
> > - if (!request_region(TCOBASE, 0x20, "iTCO_wdt")) {
> > - printk(KERN_ERR PFX "I/O address 0x%04lx already in
> > use "
> > - "device
> > disabled\n", TCOBASE);
> > - ret = -EIO;
> > + if (!request_region(iTCO_wdt_private.tco_res->start,
> > + resource_size(iTCO_wdt_private.tco_res),
> > dev->name)) {
> > + pr_err("I/O address 0x%04llx already in use device
> > disabled\n",
> > + TCOBASE);
> > + ret = -EBUSY;
> > goto unreg_smi_en;
> > }
> >
> > - printk(KERN_INFO PFX
> > - "Found a %s TCO device (Version=%d,
> > TCOBASE=0x%04lx)\n",
> > - iTCO_chipset_info[ent->driver_data].name,
> > -
> > iTCO_chipset_info[ent->driver_data].iTCO_version,
> > - TCOBASE);
> > + pr_info("Found a %s TCO device (Version=%d,
> > TCOBASE=0x%04llx)\n",
> > + ich_info->name, ich_info->iTCO_version, TCOBASE);
> >
> > /* Clear out the (probably old) status */
> > outw(0x0008, TCO1_STS); /* Clear the Time Out Status bit */
> > @@ -882,79 +596,38 @@ static int __devinit iTCO_wdt_init(struct
> > pci_dev *pdev,
> > if not reset to the default */
> > if (iTCO_wdt_set_heartbeat(heartbeat)) {
> > iTCO_wdt_set_heartbeat(WATCHDOG_HEARTBEAT);
> > - printk(KERN_INFO PFX
> > - "timeout value out of range, using %d\n",
> > heartbeat);
> > + pr_info("timeout value out of range, using %d\n",
> > heartbeat);
> > }
> >
> > ret = misc_register(&iTCO_wdt_miscdev);
> > if (ret != 0) {
> > - printk(KERN_ERR PFX
> > - "cannot register miscdev on minor=%d
> > (err=%d)\n",
> > + pr_err("cannot register miscdev on minor=%d
> > (err=%d)\n",
> > WATCHDOG_MINOR,
> > ret);
> > goto unreg_region;
> > }
> >
> > - printk(KERN_INFO PFX "initialized. heartbeat=%d sec
> > (nowayout=%d)\n",
> > + pr_info("initialized. heartbeat=%d sec (nowayout=%d)\n",
> > heartbeat,
> > nowayout);
> >
> > return 0;
> >
> > unreg_region:
> > - release_region(TCOBASE, 0x20);
> > + release_resource(iTCO_wdt_private.tco_res);
> > unreg_smi_en:
> > - release_region(SMI_EN, 4);
> > + release_resource(iTCO_wdt_private.tco_res);
>
> This doesn't look correct - you release tco_res twice. smi_res ?
Also, a release for gcs_res is currently missing here...
>
> > out_unmap:
> > if (iTCO_wdt_private.iTCO_version == 2)
> > iounmap(iTCO_wdt_private.gcs);
> > out:
> > - iTCO_wdt_private.ACPIBASE = 0;
> > - return ret;
> > -}
> > -
--
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