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Date: Fri, 5 Apr 2019 11:22:51 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Sylwester Nawrocki <s.nawrocki@...sung.com>
Cc: kgene@...nel.org, robh+dt@...nel.org, mark.rutland@....com,
Chanwoo Choi <cw00.choi@...sung.com>, myungjoo.ham@...sung.com,
"linux-samsung-soc@...r.kernel.org"
<linux-samsung-soc@...r.kernel.org>, linux-kernel@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
pankaj.dubey@...sung.com,
Bartłomiej Żołnierkiewicz
<b.zolnierkie@...sung.com>,
Marek Szyprowski <m.szyprowski@...sung.com>
Subject: Re: [PATCH RFC 2/8] soc: samsung: Exynos chipid driver update
On Thu, 4 Apr 2019 at 19:22, Sylwester Nawrocki <s.nawrocki@...sung.com> wrote:
>
> This patch adds definition of selected CHIP ID register offsets
> and register bit field definitions for Exynos5422 SoC.
>
> exynos_chipid_read() helper function is added to allow reading
> the CHIP ID block registers.
>
> Signed-off-by: Sylwester Nawrocki <s.nawrocki@...sung.com>
> ---
> drivers/soc/samsung/exynos-chipid.c | 16 +++++-----
> drivers/soc/samsung/exynos-chipid.h | 48 +++++++++++++++++++++++++++++
> 2 files changed, 57 insertions(+), 7 deletions(-)
> create mode 100644 drivers/soc/samsung/exynos-chipid.h
>
> diff --git a/drivers/soc/samsung/exynos-chipid.c b/drivers/soc/samsung/exynos-chipid.c
> index 5cb018807817..4920f0ef2c55 100644
> --- a/drivers/soc/samsung/exynos-chipid.c
> +++ b/drivers/soc/samsung/exynos-chipid.c
> @@ -16,10 +16,7 @@
> #include <linux/slab.h>
> #include <linux/sys_soc.h>
>
> -#define EXYNOS_SUBREV_MASK (0xF << 4)
> -#define EXYNOS_MAINREV_MASK (0xF << 0)
> -#define EXYNOS_REV_MASK (EXYNOS_SUBREV_MASK | EXYNOS_MAINREV_MASK)
> -#define EXYNOS_MASK 0xFFFFF000
Create hex-addresses in first commit in lower case.
> +#include "exynos-chipid.h"
>
> static const struct exynos_soc_id {
> const char *name;
> @@ -40,6 +37,13 @@ static const struct exynos_soc_id {
> { "EXYNOS5433", 0xE5433000 },
> };
>
> +static void __iomem *exynos_chipid_base;
No, this was removed in Pankaj's version v6 -> v7 and I do not want it
to be file-scope. Having it file-scope is error prone and prevents
having multiple instances (I do not expect having more than one but
still code should be rather nicely generic).
> +
> +unsigned int exynos_chipid_read(unsigned int offset)
> +{
> + return readl_relaxed(exynos_chipid_base + offset);
> +}
> +
> static const char * __init product_id_to_soc_id(unsigned int product_id)
> {
> int i;
> @@ -53,7 +57,6 @@ static const char * __init product_id_to_soc_id(unsigned int product_id)
> int __init exynos_chipid_early_init(void)
> {
> struct soc_device_attribute *soc_dev_attr;
> - void __iomem *exynos_chipid_base;
> struct soc_device *soc_dev;
> struct device_node *root;
> struct device_node *np;
> @@ -73,9 +76,8 @@ int __init exynos_chipid_early_init(void)
> return -ENXIO;
> }
>
> - product_id = readl_relaxed(exynos_chipid_base);
> + product_id = exynos_chipid_read(EXYNOS_CHIPID_REG_PRO_ID);
> revision = product_id & EXYNOS_REV_MASK;
> - iounmap(exynos_chipid_base);
>
> soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
> if (!soc_dev_attr)
> diff --git a/drivers/soc/samsung/exynos-chipid.h b/drivers/soc/samsung/exynos-chipid.h
> new file mode 100644
> index 000000000000..826a12c25fa2
> --- /dev/null
> +++ b/drivers/soc/samsung/exynos-chipid.h
> @@ -0,0 +1,48 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (c) 2018 Samsung Electronics Co., Ltd.
> + * http://www.samsung.com/
> + *
> + * EXYNOS - CHIP ID support
> + */
> +
> +#define EXYNOS_CHIPID_REG_PRO_ID 0x00
> + #define EXYNOS_SUBREV_MASK (0xf << 4)
> + #define EXYNOS_MAINREV_MASK (0xf << 0)
> + #define EXYNOS_REV_MASK (EXYNOS_SUBREV_MASK | \
> + EXYNOS_MAINREV_MASK)
> + #define EXYNOS_MASK 0xfffff000
> +
> +#define EXYNOS_CHIPID_REG_PKG_ID 0x04
Can you comment that these are fields from this register?
The same in second one.
Best regards,
Krzysztof
> + #define EXYNOS5422_IDS_OFFSET 24
> + #define EXYNOS5422_IDS_MASK 0xff
> + #define EXYNOS5422_USESG_OFFSET 3
> + #define EXYNOS5422_USESG_MASK 0x01
> + #define EXYNOS5422_SG_OFFSET 0
> + #define EXYNOS5422_SG_MASK 0x07
> + #define EXYNOS5422_TABLE_OFFSET 8
> + #define EXYNOS5422_TABLE_MASK 0x03
> + #define EXYNOS5422_SG_A_OFFSET 17
> + #define EXYNOS5422_SG_A_MASK 0x0f
> + #define EXYNOS5422_SG_B_OFFSET 21
> + #define EXYNOS5422_SG_B_MASK 0x03
> + #define EXYNOS5422_SG_BSIGN_OFFSET 23
> + #define EXYNOS5422_SG_BSIGN_MASK 0x01
> + #define EXYNOS5422_BIN2_OFFSET 12
> + #define EXYNOS5422_BIN2_MASK 0x01
> +
> +#define EXYNOS_CHIPID_REG_LOT_ID 0x14
> +
> +#define EXYNOS_CHIPID_AUX_INFO 0x1c
> + #define EXYNOS5422_TMCB_OFFSET 0
> + #define EXYNOS5422_TMCB_MASK 0x7f
> + #define EXYNOS5422_ARM_UP_OFFSET 8
> + #define EXYNOS5422_ARM_UP_MASK 0x03
> + #define EXYNOS5422_ARM_DN_OFFSET 10
> + #define EXYNOS5422_ARM_DN_MASK 0x03
> + #define EXYNOS5422_KFC_UP_OFFSET 12
> + #define EXYNOS5422_KFC_UP_MASK 0x03
> + #define EXYNOS5422_KFC_DN_OFFSET 14
> + #define EXYNOS5422_KFC_DN_MASK 0x03
> +
> +unsigned int exynos_chipid_read(unsigned int offset);
> --
> 2.17.1
>
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