linux-kernel - Re: [PATCH v2 1/2] drivers: qcom: add command DB driver

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Date:   Thu, 8 Feb 2018 13:48:08 -0700
From:   Jordan Crouse <jcrouse@...eaurora.org>
To:     Lina Iyer <ilina@...eaurora.org>
Cc:     andy.gross@...aro.org, david.brown@...aro.org,
        linux-arm-msm@...r.kernel.org, linux-soc@...r.kernel.org,
        sboyd@...eaurora.org, rnayak@...eaurora.org,
        msivasub@...eaurora.org, bjorn.andersson@...aro.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/2] drivers: qcom: add command DB driver

On Thu, Feb 08, 2018 at 12:51:53PM -0700, Lina Iyer wrote:
> From: Mahesh Sivasubramanian <msivasub@...eaurora.org>
> 
> Command DB is a simple database in the shared memory of QCOM SoCs, that
> provides information regarding shared resources. Some shared resources
> in the SoC have properties that are probed dynamically at boot by the
> remote processor. The information pertaining to the SoC and the platform
> are made available in the shared memory. Drivers can query this
> information using predefined strings.
> 
> Signed-off-by: Mahesh Sivasubramanian <msivasub@...eaurora.org>
> Signed-off-by: Lina Iyer <ilina@...eaurora.org>
> ---

*snip*

> diff --git a/drivers/soc/qcom/cmd-db.c b/drivers/soc/qcom/cmd-db.c
> new file mode 100644
> index 000000000000..050a56da76c8
> --- /dev/null
> +++ b/drivers/soc/qcom/cmd-db.c
> @@ -0,0 +1,321 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/* Copyright (c) 2016-2018, The Linux Foundation. All rights reserved. */
> +
> +#include <linux/kernel.h>
> +#include <linux/of.h>
> +#include <linux/of_address.h>
> +#include <linux/of_platform.h>
> +#include <linux/of_reserved_mem.h>
> +#include <linux/platform_device.h>
> +#include <linux/types.h>
> +
> +#include <soc/qcom/cmd-db.h>
> +
> +#define NUM_PRIORITY		2
> +#define MAX_SLV_ID		8
> +#define CMD_DB_MAGIC		0x0C0330DBUL
> +#define SLAVE_ID_MASK		0x7
> +#define SLAVE_ID_SHIFT		16
> +
> +#define ENTRY_HEADER(hdr)	((void *)cmd_db_header +	\
> +				sizeof(*cmd_db_header) +	\
> +				hdr->header_offset)
> +
> +#define RSC_OFFSET(hdr, ent)	((void *)cmd_db_header +	\
> +				sizeof(*cmd_db_header) +	\
> +				hdr.data_offset + ent.offset)
> +
> +#define MIN(a, b)		(((a) < (b)) ? (a) : (b))

I'm not sure if this was addressed before. Why use a custom macro and not min()
or min_t()?

Jordan
-- 
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