linux-kernel - Re: [PATCH 1/2] sp5100_tco: fix the device check for SB800 and later chipsets

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Date:	Tue, 24 Nov 2015 05:58:03 -0800
From:	Guenter Roeck <linux@...ck-us.net>
To:	Huang Rui <ray.huang@....com>, Wim Van Sebroeck <wim@...ana.be>
Cc:	linux-watchdog@...r.kernel.org, linux-kernel@...r.kernel.org,
	Denis Turischev <denis.turischev@...pulab.co.il>,
	Borislav Petkov <bp@...en8.de>,
	Vincent Wan <vincent.wan@....com>, Tony Li <tony.li@....com>
Subject: Re: [PATCH 1/2] sp5100_tco: fix the device check for SB800 and later
 chipsets

On 11/23/2015 02:07 AM, Huang Rui wrote:
> For SB800 and later chipsets, the register definitions are the same
> with SB800. And for SB700 and older chipsets, the definitions should
> be same with SP5100/SB7x0.
>
> Signed-off-by: Huang Rui <ray.huang@....com>
> Cc: Denis Turischev <denis.turischev@...pulab.co.il>

Reviewed-by: Guenter Roeck <linux@...ck-us.net>

Would it make sense to rework this driver as pci driver ?

Thanks,
Guenter

> ---
>
> Hi Guenter,
>
> These two patches should be on top of "sp5100_tco: Add AMD Mullins
> platform support". And are rebased at watchdog-next branch.
>
> Thanks,
> Rui
>
> ---
>   drivers/watchdog/sp5100_tco.c | 28 ++++++++++++++++------------
>   1 file changed, 16 insertions(+), 12 deletions(-)
>
> diff --git a/drivers/watchdog/sp5100_tco.c b/drivers/watchdog/sp5100_tco.c
> index ef039f8..c9dd419 100644
> --- a/drivers/watchdog/sp5100_tco.c
> +++ b/drivers/watchdog/sp5100_tco.c
> @@ -333,21 +333,24 @@ static unsigned char sp5100_tco_setupdevice(void)
>   	if (!sp5100_tco_pci)
>   		return 0;
>
> -	pr_info("PCI Revision ID: 0x%x\n", sp5100_tco_pci->revision);
> +	pr_info("PCI Vendor ID: 0x%x, Device ID: 0x%x, Revision ID: 0x%x\n",
> +		sp5100_tco_pci->vendor, sp5100_tco_pci->device,
> +		sp5100_tco_pci->revision);
>
>   	/*
>   	 * Determine type of southbridge chipset.
>   	 */
> -	if (sp5100_tco_pci->revision >= 0x40) {
> -		dev_name = SB800_DEVNAME;
> -		index_reg = SB800_IO_PM_INDEX_REG;
> -		data_reg = SB800_IO_PM_DATA_REG;
> -		base_addr = SB800_PM_WATCHDOG_BASE;
> -	} else {
> +	if (sp5100_tco_pci->device == PCI_DEVICE_ID_ATI_SBX00_SMBUS &&
> +	    sp5100_tco_pci->revision < 0x40) {
>   		dev_name = SP5100_DEVNAME;
>   		index_reg = SP5100_IO_PM_INDEX_REG;
>   		data_reg = SP5100_IO_PM_DATA_REG;
>   		base_addr = SP5100_PM_WATCHDOG_BASE;
> +	} else {
> +		dev_name = SB800_DEVNAME;
> +		index_reg = SB800_IO_PM_INDEX_REG;
> +		data_reg = SB800_IO_PM_DATA_REG;
> +		base_addr = SB800_PM_WATCHDOG_BASE;
>   	}
>
>   	/* Request the IO ports used by this driver */
> @@ -383,7 +386,12 @@ static unsigned char sp5100_tco_setupdevice(void)
>   	 * Secondly, Find the watchdog timer MMIO address
>   	 * from SBResource_MMIO register.
>   	 */
> -	if (sp5100_tco_pci->revision >= 0x40) {
> +	if (sp5100_tco_pci->device == PCI_DEVICE_ID_ATI_SBX00_SMBUS &&
> +	    sp5100_tco_pci->revision < 0x40) {
> +		/* Read SBResource_MMIO from PCI config(PCI_Reg: 9Ch) */
> +		pci_read_config_dword(sp5100_tco_pci,
> +				      SP5100_SB_RESOURCE_MMIO_BASE, &val);
> +	} else {
>   		/* Read SBResource_MMIO from AcpiMmioEn(PM_Reg: 24h) */
>   		outb(SB800_PM_ACPI_MMIO_EN+3, SB800_IO_PM_INDEX_REG);
>   		val = inb(SB800_IO_PM_DATA_REG);
> @@ -393,10 +401,6 @@ static unsigned char sp5100_tco_setupdevice(void)
>   		val = val << 8 | inb(SB800_IO_PM_DATA_REG);
>   		outb(SB800_PM_ACPI_MMIO_EN+0, SB800_IO_PM_INDEX_REG);
>   		val = val << 8 | inb(SB800_IO_PM_DATA_REG);
> -	} else {
> -		/* Read SBResource_MMIO from PCI config(PCI_Reg: 9Ch) */
> -		pci_read_config_dword(sp5100_tco_pci,
> -				      SP5100_SB_RESOURCE_MMIO_BASE, &val);
>   	}
>
>   	/* The SBResource_MMIO is enabled and mapped memory space? */
>

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