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

[Jordan Crouse]

On Thu, Feb 08, 2018 at 12:51:53PM -0700, Lina Iyer wrote:
> From: Mahesh Sivasubramanian <msivasub@xxxxxxxxxxxxxx>
> 
> 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@xxxxxxxxxxxxxx>
> Signed-off-by: Lina Iyer <ilina@xxxxxxxxxxxxxx>
> ---

*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
-- 
The Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project