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Message-ID: <20230424192137.GB30248@pengutronix.de>
Date: Mon, 24 Apr 2023 21:21:37 +0200
From: Philipp Zabel <p.zabel@...gutronix.de>
To: Jacky Huang <ychuang570808@...il.com>
Cc: robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
lee@...nel.org, mturquette@...libre.com, sboyd@...nel.org,
gregkh@...uxfoundation.org, jirislaby@...nel.org,
devicetree@...r.kernel.org, linux-clk@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org,
arnd@...db.de, schung@...oton.com, mjchen@...oton.com,
Jacky Huang <ychuang3@...oton.com>
Subject: Re: [PATCH v7 10/12] reset: Add Nuvoton ma35d1 reset driver support
Hi Jacky,
On Wed, Apr 12, 2023 at 05:38:22AM +0000, Jacky Huang wrote:
> From: Jacky Huang <ychuang3@...oton.com>
>
> This driver supports individual IP reset for ma35d1. The reset
> control registers is a subset of system control registers.
>
> Signed-off-by: Jacky Huang <ychuang3@...oton.com>
> ---
> drivers/reset/Kconfig | 6 +
> drivers/reset/Makefile | 1 +
> drivers/reset/reset-ma35d1.c | 255 +++++++++++++++++++++++++++++++++++
> 3 files changed, 262 insertions(+)
> create mode 100644 drivers/reset/reset-ma35d1.c
>
> diff --git a/drivers/reset/Kconfig b/drivers/reset/Kconfig
> index 2a52c990d4fe..58477c6ca9b8 100644
> --- a/drivers/reset/Kconfig
> +++ b/drivers/reset/Kconfig
> @@ -143,6 +143,12 @@ config RESET_NPCM
> This enables the reset controller driver for Nuvoton NPCM
> BMC SoCs.
>
> +config RESET_NUVOTON_MA35D1
> + bool "Nuvton MA35D1 Reset Driver"
> + default ARCH_NUVOTON || COMPILE_TEST
> + help
> + This enables the reset controller driver for Nuvoton MA35D1 SoC.
> +
> config RESET_OXNAS
> bool
>
> diff --git a/drivers/reset/Makefile b/drivers/reset/Makefile
> index 3e7e5fd633a8..fd52dcf66a99 100644
> --- a/drivers/reset/Makefile
> +++ b/drivers/reset/Makefile
> @@ -20,6 +20,7 @@ obj-$(CONFIG_RESET_MCHP_SPARX5) += reset-microchip-sparx5.o
> obj-$(CONFIG_RESET_MESON) += reset-meson.o
> obj-$(CONFIG_RESET_MESON_AUDIO_ARB) += reset-meson-audio-arb.o
> obj-$(CONFIG_RESET_NPCM) += reset-npcm.o
> +obj-$(CONFIG_RESET_NUVOTON_MA35D1) += reset-ma35d1.o
> obj-$(CONFIG_RESET_OXNAS) += reset-oxnas.o
> obj-$(CONFIG_RESET_PISTACHIO) += reset-pistachio.o
> obj-$(CONFIG_RESET_POLARFIRE_SOC) += reset-mpfs.o
> diff --git a/drivers/reset/reset-ma35d1.c b/drivers/reset/reset-ma35d1.c
> new file mode 100644
> index 000000000000..57ed710c10f4
> --- /dev/null
> +++ b/drivers/reset/reset-ma35d1.c
> @@ -0,0 +1,255 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * Copyright (C) 2023 Nuvoton Technology Corp.
> + * Author: Chi-Fang Li <cfli0@...oton.com>
> + */
> +
> +#include <linux/device.h>
> +#include <linux/io.h>
> +#include <linux/of.h>
> +#include <linux/platform_device.h>
> +#include <linux/reboot.h>
> +#include <linux/reset-controller.h>
> +#include <dt-bindings/reset/nuvoton,ma35d1-reset.h>
> +
> +struct ma35d1_reset_data {
> + struct reset_controller_dev rcdev;
> + void __iomem *base;
> +};
> +
> +struct ma35d1_reboot_data {
> + struct notifier_block restart_handler;
> + void __iomem *base;
> +};
These two structs can be combined into one, no need to duplicate the
iomem base.
> +
> +static const struct {
> + unsigned long id;
Why store the id? ids should be contiguous and should start at 0,
so the id could just be an index into the array.
> + u32 reg_ofs;
> + u32 bit;
> +} ma35d1_reset_map[] = {
> + { MA35D1_RESET_CHIP, 0x20, 0 },
> + { MA35D1_RESET_CA35CR0, 0x20, 1 },
> + { MA35D1_RESET_CA35CR1, 0x20, 2 },
> + { MA35D1_RESET_CM4, 0x20, 3 },
> + { MA35D1_RESET_PDMA0, 0x20, 4 },
> + { MA35D1_RESET_PDMA1, 0x20, 5 },
> + { MA35D1_RESET_PDMA2, 0x20, 6 },
> + { MA35D1_RESET_PDMA3, 0x20, 7 },
> + { MA35D1_RESET_DISP, 0x20, 9 },
> + { MA35D1_RESET_VCAP0, 0x20, 10 },
> + { MA35D1_RESET_VCAP1, 0x20, 11 },
> + { MA35D1_RESET_GFX, 0x20, 12 },
> + { MA35D1_RESET_VDEC, 0x20, 13 },
> + { MA35D1_RESET_WHC0, 0x20, 14 },
> + { MA35D1_RESET_WHC1, 0x20, 15 },
> + { MA35D1_RESET_GMAC0, 0x20, 16 },
> + { MA35D1_RESET_GMAC1, 0x20, 17 },
> + { MA35D1_RESET_HWSEM, 0x20, 18 },
> + { MA35D1_RESET_EBI, 0x20, 19 },
> + { MA35D1_RESET_HSUSBH0, 0x20, 20 },
> + { MA35D1_RESET_HSUSBH1, 0x20, 21 },
> + { MA35D1_RESET_HSUSBD, 0x20, 22 },
> + { MA35D1_RESET_USBHL, 0x20, 23 },
> + { MA35D1_RESET_SDH0, 0x20, 24 },
> + { MA35D1_RESET_SDH1, 0x20, 25 },
> + { MA35D1_RESET_NAND, 0x20, 26 },
> + { MA35D1_RESET_GPIO, 0x20, 27 },
> + { MA35D1_RESET_MCTLP, 0x20, 28 },
> + { MA35D1_RESET_MCTLC, 0x20, 29 },
> + { MA35D1_RESET_DDRPUB, 0x20, 30 },
> + { MA35D1_RESET_TMR0, 0x24, 2 },
> + { MA35D1_RESET_TMR1, 0x24, 3 },
> + { MA35D1_RESET_TMR2, 0x24, 4 },
> + { MA35D1_RESET_TMR3, 0x24, 5 },
> + { MA35D1_RESET_I2C0, 0x24, 8 },
> + { MA35D1_RESET_I2C1, 0x24, 9 },
> + { MA35D1_RESET_I2C2, 0x24, 10 },
> + { MA35D1_RESET_I2C3, 0x24, 11 },
> + { MA35D1_RESET_QSPI0, 0x24, 12 },
> + { MA35D1_RESET_SPI0, 0x24, 13 },
> + { MA35D1_RESET_SPI1, 0x24, 14 },
> + { MA35D1_RESET_SPI2, 0x24, 15 },
> + { MA35D1_RESET_UART0, 0x24, 16 },
> + { MA35D1_RESET_UART1, 0x24, 17 },
> + { MA35D1_RESET_UART2, 0x24, 18 },
> + { MA35D1_RESET_UAER3, 0x24, 19 },
> + { MA35D1_RESET_UART4, 0x24, 20 },
> + { MA35D1_RESET_UART5, 0x24, 21 },
> + { MA35D1_RESET_UART6, 0x24, 22 },
> + { MA35D1_RESET_UART7, 0x24, 23 },
> + { MA35D1_RESET_CANFD0, 0x24, 24 },
> + { MA35D1_RESET_CANFD1, 0x24, 25 },
> + { MA35D1_RESET_EADC0, 0x24, 28 },
> + { MA35D1_RESET_I2S0, 0x24, 29 },
> + { MA35D1_RESET_SC0, 0x28, 0 },
> + { MA35D1_RESET_SC1, 0x28, 1 },
> + { MA35D1_RESET_QSPI1, 0x28, 4 },
> + { MA35D1_RESET_SPI3, 0x28, 6 },
> + { MA35D1_RESET_EPWM0, 0x28, 16 },
> + { MA35D1_RESET_EPWM1, 0x28, 17 },
> + { MA35D1_RESET_QEI0, 0x28, 22 },
> + { MA35D1_RESET_QEI1, 0x28, 23 },
> + { MA35D1_RESET_ECAP0, 0x28, 26 },
> + { MA35D1_RESET_ECAP1, 0x28, 27 },
> + { MA35D1_RESET_CANFD2, 0x28, 28 },
> + { MA35D1_RESET_ADC0, 0x28, 31 },
> + { MA35D1_RESET_TMR4, 0x2C, 0 },
> + { MA35D1_RESET_TMR5, 0x2C, 1 },
> + { MA35D1_RESET_TMR6, 0x2C, 2 },
> + { MA35D1_RESET_TMR7, 0x2C, 3 },
> + { MA35D1_RESET_TMR8, 0x2C, 4 },
> + { MA35D1_RESET_TMR9, 0x2C, 5 },
> + { MA35D1_RESET_TMR10, 0x2C, 6 },
> + { MA35D1_RESET_TMR11, 0x2C, 7 },
> + { MA35D1_RESET_UART8, 0x2C, 8 },
> + { MA35D1_RESET_UART9, 0x2C, 9 },
> + { MA35D1_RESET_UART10, 0x2C, 10 },
> + { MA35D1_RESET_UART11, 0x2C, 11 },
> + { MA35D1_RESET_UART12, 0x2C, 12 },
> + { MA35D1_RESET_UART13, 0x2C, 13 },
> + { MA35D1_RESET_UART14, 0x2C, 14 },
> + { MA35D1_RESET_UART15, 0x2C, 15 },
> + { MA35D1_RESET_UART16, 0x2C, 16 },
> + { MA35D1_RESET_I2S1, 0x2C, 17 },
> + { MA35D1_RESET_I2C4, 0x2C, 18 },
> + { MA35D1_RESET_I2C5, 0x2C, 19 },
> + { MA35D1_RESET_EPWM2, 0x2C, 20 },
> + { MA35D1_RESET_ECAP2, 0x2C, 21 },
> + { MA35D1_RESET_QEI2, 0x2C, 22 },
> + { MA35D1_RESET_CANFD3, 0x2C, 23 },
> + { MA35D1_RESET_KPI, 0x2C, 24 },
> + { MA35D1_RESET_GIC, 0x2C, 28 },
> + { MA35D1_RESET_SSMCC, 0x2C, 30 },
> + { MA35D1_RESET_SSPCC, 0x2C, 31 }
> +};
> +
> +static u32 ma35d1_reset_map_lookup(unsigned long id)
> +{
> + u32 i;
> +
> + for (i = 0; i < ARRAY_SIZE(ma35d1_reset_map); i++) {
> + if (ma35d1_reset_map[i].id == id)
> + break;
> + }
> + return i;
> +}
If you use the id as a look up into the mapping array, this lookup
function wouldn't be necessary.
> +static int ma35d1_restart_handler(struct notifier_block *this,
> + unsigned long mode, void *cmd)
> +{
> + u32 i;
> + struct ma35d1_reboot_data *data = container_of(this,
> + struct ma35d1_reboot_data,
> + restart_handler);
> +
> + i = ma35d1_reset_map_lookup(MA35D1_RESET_CHIP);
> + writel_relaxed(BIT(ma35d1_reset_map[i].bit),
> + data->base + ma35d1_reset_map[i].reg_ofs);
> + return 0;
> +}
> +
> +static int ma35d1_reset_update(struct reset_controller_dev *rcdev,
> + unsigned long id, bool assert)
> +{
> + u32 i, reg;
> + struct ma35d1_reset_data *data = container_of(rcdev,
> + struct ma35d1_reset_data,
> + rcdev);
> +
> + i = ma35d1_reset_map_lookup(id);
> + reg = readl_relaxed(data->base + ma35d1_reset_map[i].reg_ofs);
> + if (assert)
> + reg |= BIT(ma35d1_reset_map[i].bit);
> + else
> + reg &= ~(BIT(ma35d1_reset_map[i].bit));
> + writel_relaxed(reg, data->base + ma35d1_reset_map[i].reg_ofs);
This requires a spinlock to protect the register from simultaneous
read-modify-writes.
[...]
> +static int ma35d1_reset_probe(struct platform_device *pdev)
> +{
> + int err;
> + struct device *dev = &pdev->dev;
> + struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + struct ma35d1_reset_data *reset_data;
> + struct ma35d1_reboot_data *reboot_data;
> +
> + if (!pdev->dev.of_node) {
> + dev_err(&pdev->dev, "Device tree node not found\n");
The driver is only probed via OF, so this isn't reachable and can be
dropped.
regards
Philipp
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