linux-kernel - Re: [RFC PATCH 4/5] fsi/scom: Add register definitions

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Date:   Wed, 13 Jun 2018 09:57:42 -0500
From:   Eddie James <eajames@...ux.vnet.ibm.com>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        openbmc@...ts.ozlabs.org
Cc:     Andrew Jeffery <andrew@...id.au>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 4/5] fsi/scom: Add register definitions



On 06/12/2018 12:19 AM, Benjamin Herrenschmidt wrote:
> Add a few more register and bit definitions, also define and use
> SCOM_READ_CMD (which is 0 but it makes the code clearer)
>
> Signed-off-by: Benjamin Herrenschmidt <benh@...nel.crashing.org>

Reviewed-by: Eddie James <eajames@...ux.vnet.ibm.com>

> ---
>   drivers/fsi/fsi-scom.c | 19 ++++++++++++++++++-
>   1 file changed, 18 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/fsi/fsi-scom.c b/drivers/fsi/fsi-scom.c
> index 6ddfb6021420..e98573ecdae1 100644
> --- a/drivers/fsi/fsi-scom.c
> +++ b/drivers/fsi/fsi-scom.c
> @@ -30,8 +30,25 @@
>   #define SCOM_DATA0_REG		0x00
>   #define SCOM_DATA1_REG		0x04
>   #define SCOM_CMD_REG		0x08
> +#define SCOM_FSI2PIB_RESET_REG	0x18
> +#define SCOM_STATUS_REG		0x1C /* Read */
> +#define SCOM_PIB_RESET_REG	0x1C /* Write */
>
> +/* Command register */
>   #define SCOM_WRITE_CMD		0x80000000
> +#define SCOM_READ_CMD		0x00000000
> +
> +/* Status register bits */
> +#define SCOM_STATUS_ERR_SUMMARY		0x80000000
> +#define SCOM_STATUS_PROTECTION		0x01000000
> +#define SCOM_STATUS_PIB_ABORT		0x00100000
> +#define SCOM_STATUS_PIB_RESP_MASK	0x00007000
> +#define SCOM_STATUS_PIB_RESP_SHIFT	12
> +
> +#define SCOM_STATUS_ANY_ERR		(SCOM_STATUS_ERR_SUMMARY | \
> +					 SCOM_STATUS_PROTECTION | \
> +					 SCOM_STATUS_PIB_ABORT | \
> +					 SCOM_STATUS_PIB_RESP_MASK)
>
>   struct scom_device {
>   	struct list_head link;
> @@ -85,7 +102,7 @@ static int get_scom(struct scom_device *scom_dev, uint64_t *value,
>
>   	mutex_lock(&scom_dev->lock);
>   	*value = 0ULL;
> -	data = cpu_to_be32(addr);
> +	data = cpu_to_be32(SCOM_READ_CMD | addr);
>   	rc = fsi_device_write(scom_dev->fsi_dev, SCOM_CMD_REG, &data,
>   				sizeof(uint32_t));
>   	if (rc)