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Message-ID: <3cc8c9b8-b957-2fef-d6da-47980d1926aa@intel.com>
Date: Wed, 15 Apr 2020 12:34:25 +0300
From: Adrian Hunter <adrian.hunter@...el.com>
To: Masahiro Yamada <yamada.masahiro@...ionext.com>,
linux-mmc@...r.kernel.org
Cc: linux-kernel@...r.kernel.org, Ulf Hansson <ulf.hansson@...aro.org>,
masahiroy@...nel.org,
Alexandre Belloni <alexandre.belloni@...tlin.com>,
Fabio Estevam <festevam@...il.com>,
Ludovic Desroches <ludovic.desroches@...rochip.com>,
NXP Linux Team <linux-imx@....com>,
Nicolas Ferre <nicolas.ferre@...rochip.com>,
Pengutronix Kernel Team <kernel@...gutronix.de>,
Sascha Hauer <s.hauer@...gutronix.de>,
Shawn Guo <shawnguo@...nel.org>,
linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 2/2] mmc: sdhci: use FIELD_GET/PREP for capabilities bit
masks
On 8/04/20 10:21 am, Masahiro Yamada wrote:
> Use FIELD_GET and FIELD_PREP to get access to the register fields.
> Delete the shift macros. I used GENMASK() for touched macros.
That has the side-effect of changing the constants to 64-bit on 64-bit
platforms, which needs to be mentioned in the commit message.
>
> Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.com>
Apart from above:
Acked-by: Adrian Hunter <adrian.hunter@...el.com>
> ---
>
> drivers/mmc/host/sdhci-esdhc-imx.c | 4 +++-
> drivers/mmc/host/sdhci-of-at91.c | 5 +++--
> drivers/mmc/host/sdhci-pci-core.c | 8 ++------
> drivers/mmc/host/sdhci.c | 19 +++++++------------
> drivers/mmc/host/sdhci.h | 17 ++++++-----------
> 5 files changed, 21 insertions(+), 32 deletions(-)
>
> diff --git a/drivers/mmc/host/sdhci-esdhc-imx.c b/drivers/mmc/host/sdhci-esdhc-imx.c
> index 5ec8e4bf1ac7..38cd83118082 100644
> --- a/drivers/mmc/host/sdhci-esdhc-imx.c
> +++ b/drivers/mmc/host/sdhci-esdhc-imx.c
> @@ -8,6 +8,7 @@
> * Author: Wolfram Sang <kernel@...gutronix.de>
> */
>
> +#include <linux/bitfield.h>
> #include <linux/io.h>
> #include <linux/iopoll.h>
> #include <linux/delay.h>
> @@ -399,7 +400,8 @@ static u32 esdhc_readl_le(struct sdhci_host *host, int reg)
> val = SDHCI_SUPPORT_DDR50 | SDHCI_SUPPORT_SDR104
> | SDHCI_SUPPORT_SDR50
> | SDHCI_USE_SDR50_TUNING
> - | (SDHCI_TUNING_MODE_3 << SDHCI_RETUNING_MODE_SHIFT);
> + | FIELD_PREP(SDHCI_RETUNING_MODE_MASK,
> + SDHCI_TUNING_MODE_3);
>
> if (imx_data->socdata->flags & ESDHC_FLAG_HS400)
> val |= SDHCI_SUPPORT_HS400;
> diff --git a/drivers/mmc/host/sdhci-of-at91.c b/drivers/mmc/host/sdhci-of-at91.c
> index c79bff5e2280..25f4e0f4f53b 100644
> --- a/drivers/mmc/host/sdhci-of-at91.c
> +++ b/drivers/mmc/host/sdhci-of-at91.c
> @@ -6,6 +6,7 @@
> * 2015 Ludovic Desroches <ludovic.desroches@...el.com>
> */
>
> +#include <linux/bitfield.h>
> #include <linux/clk.h>
> #include <linux/delay.h>
> #include <linux/err.h>
> @@ -179,9 +180,9 @@ static int sdhci_at91_set_clks_presets(struct device *dev)
> clk_mul = gck_rate / clk_base_rate - 1;
>
> caps0 &= ~SDHCI_CLOCK_V3_BASE_MASK;
> - caps0 |= (clk_base << SDHCI_CLOCK_BASE_SHIFT) & SDHCI_CLOCK_V3_BASE_MASK;
> + caps0 |= FIELD_PREP(SDHCI_CLOCK_V3_BASE_MASK, clk_base);
> caps1 &= ~SDHCI_CLOCK_MUL_MASK;
> - caps1 |= (clk_mul << SDHCI_CLOCK_MUL_SHIFT) & SDHCI_CLOCK_MUL_MASK;
> + caps1 |= FIELD_PREP(SDHCI_CLOCK_MUL_MASK, clk_mul);
> /* Set capabilities in r/w mode. */
> writel(SDMMC_CACR_KEY | SDMMC_CACR_CAPWREN, host->ioaddr + SDMMC_CACR);
> writel(caps0, host->ioaddr + SDHCI_CAPABILITIES);
> diff --git a/drivers/mmc/host/sdhci-pci-core.c b/drivers/mmc/host/sdhci-pci-core.c
> index 525de2454a4d..a98c9476bfc8 100644
> --- a/drivers/mmc/host/sdhci-pci-core.c
> +++ b/drivers/mmc/host/sdhci-pci-core.c
> @@ -249,12 +249,8 @@ static int ricoh_probe(struct sdhci_pci_chip *chip)
> static int ricoh_mmc_probe_slot(struct sdhci_pci_slot *slot)
> {
> slot->host->caps =
> - ((0x21 << SDHCI_TIMEOUT_CLK_SHIFT)
> - & SDHCI_TIMEOUT_CLK_MASK) |
> -
> - ((0x21 << SDHCI_CLOCK_BASE_SHIFT)
> - & SDHCI_CLOCK_BASE_MASK) |
> -
> + FIELD_PREP(SDHCI_TIMEOUT_CLK_MASK, 0x21) |
> + FIELD_PREP(SDHCI_CLOCK_BASE_MASK, 0x21) |
> SDHCI_TIMEOUT_CLK_UNIT |
> SDHCI_CAN_VDD_330 |
> SDHCI_CAN_DO_HISPD |
> diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
> index 3f716466fcfd..344a7e0e33fe 100644
> --- a/drivers/mmc/host/sdhci.c
> +++ b/drivers/mmc/host/sdhci.c
> @@ -4117,11 +4117,9 @@ int sdhci_setup_host(struct sdhci_host *host)
> }
>
> if (host->version >= SDHCI_SPEC_300)
> - host->max_clk = (host->caps & SDHCI_CLOCK_V3_BASE_MASK)
> - >> SDHCI_CLOCK_BASE_SHIFT;
> + host->max_clk = FIELD_GET(SDHCI_CLOCK_V3_BASE_MASK, host->caps);
> else
> - host->max_clk = (host->caps & SDHCI_CLOCK_BASE_MASK)
> - >> SDHCI_CLOCK_BASE_SHIFT;
> + host->max_clk = FIELD_GET(SDHCI_CLOCK_BASE_MASK, host->caps);
>
> host->max_clk *= 1000000;
> if (host->max_clk == 0 || host->quirks &
> @@ -4139,8 +4137,7 @@ int sdhci_setup_host(struct sdhci_host *host)
> * In case of Host Controller v3.00, find out whether clock
> * multiplier is supported.
> */
> - host->clk_mul = (host->caps1 & SDHCI_CLOCK_MUL_MASK) >>
> - SDHCI_CLOCK_MUL_SHIFT;
> + host->clk_mul = FIELD_GET(SDHCI_CLOCK_MUL_MASK, host->caps1);
>
> /*
> * In case the value in Clock Multiplier is 0, then programmable
> @@ -4173,8 +4170,7 @@ int sdhci_setup_host(struct sdhci_host *host)
> mmc->f_max = max_clk;
>
> if (!(host->quirks & SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK)) {
> - host->timeout_clk = (host->caps & SDHCI_TIMEOUT_CLK_MASK) >>
> - SDHCI_TIMEOUT_CLK_SHIFT;
> + host->timeout_clk = FIELD_GET(SDHCI_TIMEOUT_CLK_MASK, host->caps);
>
> if (host->caps & SDHCI_TIMEOUT_CLK_UNIT)
> host->timeout_clk *= 1000;
> @@ -4326,8 +4322,8 @@ int sdhci_setup_host(struct sdhci_host *host)
> mmc->caps |= MMC_CAP_DRIVER_TYPE_D;
>
> /* Initial value for re-tuning timer count */
> - host->tuning_count = (host->caps1 & SDHCI_RETUNING_TIMER_COUNT_MASK) >>
> - SDHCI_RETUNING_TIMER_COUNT_SHIFT;
> + host->tuning_count = FIELD_GET(SDHCI_RETUNING_TIMER_COUNT_MASK,
> + host->caps1);
>
> /*
> * In case Re-tuning Timer is not disabled, the actual value of
> @@ -4337,8 +4333,7 @@ int sdhci_setup_host(struct sdhci_host *host)
> host->tuning_count = 1 << (host->tuning_count - 1);
>
> /* Re-tuning mode supported by the Host Controller */
> - host->tuning_mode = (host->caps1 & SDHCI_RETUNING_MODE_MASK) >>
> - SDHCI_RETUNING_MODE_SHIFT;
> + host->tuning_mode = FIELD_GET(SDHCI_RETUNING_MODE_MASK, host->caps1);
>
> ocr_avail = 0;
>
> diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
> index b786b68e0302..d7f1441b0fc3 100644
> --- a/drivers/mmc/host/sdhci.h
> +++ b/drivers/mmc/host/sdhci.h
> @@ -200,12 +200,10 @@
> #define SDHCI_CTRL_PRESET_VAL_ENABLE 0x8000
>
> #define SDHCI_CAPABILITIES 0x40
> -#define SDHCI_TIMEOUT_CLK_MASK 0x0000003F
> -#define SDHCI_TIMEOUT_CLK_SHIFT 0
> +#define SDHCI_TIMEOUT_CLK_MASK GENMASK(5, 0)
> #define SDHCI_TIMEOUT_CLK_UNIT 0x00000080
> -#define SDHCI_CLOCK_BASE_MASK 0x00003F00
> -#define SDHCI_CLOCK_V3_BASE_MASK 0x0000FF00
> -#define SDHCI_CLOCK_BASE_SHIFT 8
> +#define SDHCI_CLOCK_BASE_MASK GENMASK(13, 8)
> +#define SDHCI_CLOCK_V3_BASE_MASK GENMASK(15, 8)
> #define SDHCI_MAX_BLOCK_MASK 0x00030000
> #define SDHCI_MAX_BLOCK_SHIFT 16
> #define SDHCI_CAN_DO_8BIT 0x00040000
> @@ -227,13 +225,10 @@
> #define SDHCI_DRIVER_TYPE_A 0x00000010
> #define SDHCI_DRIVER_TYPE_C 0x00000020
> #define SDHCI_DRIVER_TYPE_D 0x00000040
> -#define SDHCI_RETUNING_TIMER_COUNT_MASK 0x00000F00
> -#define SDHCI_RETUNING_TIMER_COUNT_SHIFT 8
> +#define SDHCI_RETUNING_TIMER_COUNT_MASK GENMASK(11, 8)
> #define SDHCI_USE_SDR50_TUNING 0x00002000
> -#define SDHCI_RETUNING_MODE_MASK 0x0000C000
> -#define SDHCI_RETUNING_MODE_SHIFT 14
> -#define SDHCI_CLOCK_MUL_MASK 0x00FF0000
> -#define SDHCI_CLOCK_MUL_SHIFT 16
> +#define SDHCI_RETUNING_MODE_MASK GENMASK(15, 14)
> +#define SDHCI_CLOCK_MUL_MASK GENMASK(23, 16)
> #define SDHCI_CAN_DO_ADMA3 0x08000000
> #define SDHCI_SUPPORT_HS400 0x80000000 /* Non-standard */
>
>
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