[PATCH v4 2/3] reset: aspeed: register AST2700 reset auxiliary bus device

Ryan Chen ryan_chen at aspeedtech.com
Wed Sep 25 19:43:26 PDT 2024 

> Subject: Re: [PATCH v4 2/3] reset: aspeed: register AST2700 reset auxiliary bus
> device
> 
> Hi,
> 
> On Mo, 2024-09-23 at 15:50 +0800, Ryan Chen wrote:
> > The AST2700 reset driver is registered as an auxiliary device due to
> > reset and clock controller share the same register region.
> >
> > Signed-off-by: Ryan Chen <ryan_chen at aspeedtech.com>
> > ---
> >  drivers/reset/Kconfig        |   6 +
> >  drivers/reset/Makefile       |   1 +
> >  drivers/reset/reset-aspeed.c | 257
> > +++++++++++++++++++++++++++++++++++
> >  3 files changed, 264 insertions(+)
> >  create mode 100644 drivers/reset/reset-aspeed.c
> >
> > diff --git a/drivers/reset/Kconfig b/drivers/reset/Kconfig index
> > 67bce340a87e..612f22e1180d 100644
> > --- a/drivers/reset/Kconfig
> > +++ b/drivers/reset/Kconfig
> > @@ -22,6 +22,12 @@ config RESET_A10SR
> >  	  This option enables support for the external reset functions for
> >  	  peripheral PHYs on the Altera Arria10 System Resource Chip.
> >
> > +config RESET_ASPEED
> > +	tristate "ASPEED Reset Driver"
> > +	depends on ARCH_ASPEED || COMPILE_TEST
> 
> This is missing:
> 
> 	select AUXILIARY_BUS
Will add in next patch.

> 
> > +	help
> > +	  This enables the reset controller driver for AST2700.
> > +
> >  config RESET_ATH79
> >  	bool "AR71xx Reset Driver" if COMPILE_TEST
> >  	default ATH79
> > diff --git a/drivers/reset/Makefile b/drivers/reset/Makefile index
> > 27b0bbdfcc04..97482bb56416 100644
> > --- a/drivers/reset/Makefile
> > +++ b/drivers/reset/Makefile
> > @@ -5,6 +5,7 @@ obj-y += starfive/
> >  obj-y += sti/
> >  obj-y += tegra/
> >  obj-$(CONFIG_RESET_A10SR) += reset-a10sr.o
> > +obj-$(CONFIG_RESET_ASPEED) += reset-aspeed.o
> >  obj-$(CONFIG_RESET_ATH79) += reset-ath79.o
> >  obj-$(CONFIG_RESET_AXS10X) += reset-axs10x.o
> >  obj-$(CONFIG_RESET_BCM6345) += reset-bcm6345.o diff --git
> > a/drivers/reset/reset-aspeed.c b/drivers/reset/reset-aspeed.c new file
> > mode 100644 index 000000000000..40cc6e76df70
> > --- /dev/null
> > +++ b/drivers/reset/reset-aspeed.c
> > @@ -0,0 +1,257 @@
> > +// SPDX-License-Identifier: GPL-2.0-or-later
> > +/*
> > + * Copyright (c) 2024 ASPEED Technology Inc.
> > + */
> > +
> > +#include <linux/auxiliary_bus.h>
> > +#include <linux/device.h>
> > +#include <linux/io.h>
> > +#include <linux/module.h>
> > +#include <linux/of.h>
> > +#include <linux/of_address.h>
> > +#include <linux/reset-controller.h>
> > +
> > +#include <dt-bindings/reset/aspeed,ast2700-scu.h>
> > +
> > +#define SCU0_RESET_CTRL1 0x200
> > +#define SCU0_RESET_CTRL2 0x220
> > +#define SCU1_RESET_CTRL1 0x200
> > +#define SCU1_RESET_CTRL2 0x220
> > +#define SCU1_PCIE3_CTRL 0x908
> > +
> > +struct ast2700_reset_signal {
> > +	bool dedicated_clr; /* dedicated reset clr offset */
> > +	u32 offset, bit;
> > +};
> > +
> > +struct aspeed_reset_info {
> > +	unsigned int nr_resets;
> > +	const struct ast2700_reset_signal *signal; };
> > +
> > +struct aspeed_reset {
> > +	struct reset_controller_dev rcdev;
> > +	struct aspeed_reset_info *info;
> > +	spinlock_t lock; /* Protect read-modify-write cycle */
> > +	void __iomem *base;
> > +};
> > +
> > +static const struct ast2700_reset_signal ast2700_reset0_signals[] = {
> > +	[SCU0_RESET_SDRAM] = { true, SCU0_RESET_CTRL1, BIT(0) },
> > +	[SCU0_RESET_DDRPHY] = { true, SCU0_RESET_CTRL1, BIT(1) },
> > +	[SCU0_RESET_RSA] = { true, SCU0_RESET_CTRL1, BIT(2) },
> > +	[SCU0_RESET_SHA3] = { true, SCU0_RESET_CTRL1, BIT(3) },
> > +	[SCU0_RESET_HACE] = { true, SCU0_RESET_CTRL1, BIT(4) },
> > +	[SCU0_RESET_SOC] = { true, SCU0_RESET_CTRL1, BIT(5) },
> > +	[SCU0_RESET_VIDEO] = { true, SCU0_RESET_CTRL1, BIT(6) },
> > +	[SCU0_RESET_2D] = { true, SCU0_RESET_CTRL1, BIT(7) },
> > +	[SCU0_RESET_PCIS] = { true, SCU0_RESET_CTRL1, BIT(8) },
> > +	[SCU0_RESET_RVAS0] = { true, SCU0_RESET_CTRL1, BIT(9) },
> > +	[SCU0_RESET_RVAS1] = { true, SCU0_RESET_CTRL1, BIT(10) },
> > +	[SCU0_RESET_SM3] = { true, SCU0_RESET_CTRL1, BIT(11) },
> > +	[SCU0_RESET_SM4] = { true, SCU0_RESET_CTRL1, BIT(12) },
> > +	[SCU0_RESET_CRT0] = { true, SCU0_RESET_CTRL1, BIT(13) },
> > +	[SCU0_RESET_ECC] = { true, SCU0_RESET_CTRL1, BIT(14) },
> > +	[SCU0_RESET_DP_PCI] = { true, SCU0_RESET_CTRL1, BIT(15) },
> > +	[SCU0_RESET_UFS] = { true, SCU0_RESET_CTRL1, BIT(16) },
> > +	[SCU0_RESET_EMMC] = { true, SCU0_RESET_CTRL1, BIT(17) },
> > +	[SCU0_RESET_PCIE1RST] = { true, SCU0_RESET_CTRL1, BIT(18) },
> > +	[SCU0_RESET_PCIE1RSTOE] = { true, SCU0_RESET_CTRL1, BIT(19) },
> > +	[SCU0_RESET_PCIE0RST] = { true, SCU0_RESET_CTRL1, BIT(20) },
> > +	[SCU0_RESET_PCIE0RSTOE] = { true, SCU0_RESET_CTRL1, BIT(21) },
> > +	[SCU0_RESET_JTAG] = { true, SCU0_RESET_CTRL1, BIT(22) },
> > +	[SCU0_RESET_MCTP0] = { true, SCU0_RESET_CTRL1, BIT(23) },
> > +	[SCU0_RESET_MCTP1] = { true, SCU0_RESET_CTRL1, BIT(24) },
> > +	[SCU0_RESET_XDMA0] = { true, SCU0_RESET_CTRL1, BIT(25) },
> > +	[SCU0_RESET_XDMA1] = { true, SCU0_RESET_CTRL1, BIT(26) },
> > +	[SCU0_RESET_H2X1] = { true, SCU0_RESET_CTRL1, BIT(27) },
> > +	[SCU0_RESET_DP] = { true, SCU0_RESET_CTRL1, BIT(28) },
> > +	[SCU0_RESET_DP_MCU] = { true, SCU0_RESET_CTRL1, BIT(29) },
> > +	[SCU0_RESET_SSP] = { true, SCU0_RESET_CTRL1, BIT(30) },
> > +	[SCU0_RESET_H2X0] = { true, SCU0_RESET_CTRL1, BIT(31) },
> > +	[SCU0_RESET_PORTA_VHUB] = { true, SCU0_RESET_CTRL2, BIT(0) },
> > +	[SCU0_RESET_PORTA_PHY3] = { true, SCU0_RESET_CTRL2, BIT(1) },
> > +	[SCU0_RESET_PORTA_XHCI] = { true, SCU0_RESET_CTRL2, BIT(2) },
> > +	[SCU0_RESET_PORTB_VHUB] = { true, SCU0_RESET_CTRL2, BIT(3) },
> > +	[SCU0_RESET_PORTB_PHY3] = { true, SCU0_RESET_CTRL2, BIT(4) },
> > +	[SCU0_RESET_PORTB_XHCI] = { true, SCU0_RESET_CTRL2, BIT(5) },
> > +	[SCU0_RESET_PORTA_VHUB_EHCI] = { true, SCU0_RESET_CTRL2,
> BIT(6) },
> > +	[SCU0_RESET_PORTB_VHUB_EHCI] = { true, SCU0_RESET_CTRL2,
> BIT(7) },
> > +	[SCU0_RESET_UHCI] = { true, SCU0_RESET_CTRL2, BIT(8) },
> > +	[SCU0_RESET_TSP] = { true, SCU0_RESET_CTRL2, BIT(9) },
> > +	[SCU0_RESET_E2M0] = { true, SCU0_RESET_CTRL2, BIT(10) },
> > +	[SCU0_RESET_E2M1] = { true, SCU0_RESET_CTRL2, BIT(11) },
> > +	[SCU0_RESET_VLINK] = { true, SCU0_RESET_CTRL2, BIT(12) }, };
> > +
> > +static const struct ast2700_reset_signal ast2700_reset1_signals[] = {
> > +	[SCU1_RESET_LPC0] = { true, SCU1_RESET_CTRL1, BIT(0) },
> > +	[SCU1_RESET_LPC1] = { true, SCU1_RESET_CTRL1, BIT(1) },
> > +	[SCU1_RESET_MII] = { true, SCU1_RESET_CTRL1, BIT(2) },
> > +	[SCU1_RESET_PECI] = { true, SCU1_RESET_CTRL1, BIT(3) },
> > +	[SCU1_RESET_PWM] = { true, SCU1_RESET_CTRL1, BIT(4) },
> > +	[SCU1_RESET_MAC0] = { true, SCU1_RESET_CTRL1, BIT(5) },
> > +	[SCU1_RESET_MAC1] = { true, SCU1_RESET_CTRL1, BIT(6) },
> > +	[SCU1_RESET_MAC2] = { true, SCU1_RESET_CTRL1, BIT(7) },
> > +	[SCU1_RESET_ADC] = { true, SCU1_RESET_CTRL1, BIT(8) },
> > +	[SCU1_RESET_SD] = { true, SCU1_RESET_CTRL1, BIT(9) },
> > +	[SCU1_RESET_ESPI0] = { true, SCU1_RESET_CTRL1, BIT(10) },
> > +	[SCU1_RESET_ESPI1] = { true, SCU1_RESET_CTRL1, BIT(11) },
> > +	[SCU1_RESET_JTAG1] = { true, SCU1_RESET_CTRL1, BIT(12) },
> > +	[SCU1_RESET_SPI0] = { true, SCU1_RESET_CTRL1, BIT(13) },
> > +	[SCU1_RESET_SPI1] = { true, SCU1_RESET_CTRL1, BIT(14) },
> > +	[SCU1_RESET_SPI2] = { true, SCU1_RESET_CTRL1, BIT(15) },
> > +	[SCU1_RESET_I3C0] = { true, SCU1_RESET_CTRL1, BIT(16) },
> > +	[SCU1_RESET_I3C1] = { true, SCU1_RESET_CTRL1, BIT(17) },
> > +	[SCU1_RESET_I3C2] = { true, SCU1_RESET_CTRL1, BIT(18) },
> > +	[SCU1_RESET_I3C3] = { true, SCU1_RESET_CTRL1, BIT(19) },
> > +	[SCU1_RESET_I3C4] = { true, SCU1_RESET_CTRL1, BIT(20) },
> > +	[SCU1_RESET_I3C5] = { true, SCU1_RESET_CTRL1, BIT(21) },
> > +	[SCU1_RESET_I3C6] = { true, SCU1_RESET_CTRL1, BIT(22) },
> > +	[SCU1_RESET_I3C7] = { true, SCU1_RESET_CTRL1, BIT(23) },
> > +	[SCU1_RESET_I3C8] = { true, SCU1_RESET_CTRL1, BIT(24) },
> > +	[SCU1_RESET_I3C9] = { true, SCU1_RESET_CTRL1, BIT(25) },
> > +	[SCU1_RESET_I3C10] = { true, SCU1_RESET_CTRL1, BIT(26) },
> > +	[SCU1_RESET_I3C11] = { true, SCU1_RESET_CTRL1, BIT(27) },
> > +	[SCU1_RESET_I3C12] = { true, SCU1_RESET_CTRL1, BIT(28) },
> > +	[SCU1_RESET_I3C13] = { true, SCU1_RESET_CTRL1, BIT(29) },
> > +	[SCU1_RESET_I3C14] = { true, SCU1_RESET_CTRL1, BIT(30) },
> > +	[SCU1_RESET_I3C15] = { true, SCU1_RESET_CTRL1, BIT(31) },
> > +	[SCU1_RESET_MCU0] = { true, SCU1_RESET_CTRL2, BIT(0) },
> > +	[SCU1_RESET_MCU1] = { true, SCU1_RESET_CTRL2, BIT(1) },
> > +	[SCU1_RESET_H2A_SPI1] = { true, SCU1_RESET_CTRL2, BIT(2) },
> > +	[SCU1_RESET_H2A_SPI2] = { true, SCU1_RESET_CTRL2, BIT(3) },
> > +	[SCU1_RESET_UART0] = { true, SCU1_RESET_CTRL2, BIT(4) },
> > +	[SCU1_RESET_UART1] = { true, SCU1_RESET_CTRL2, BIT(5) },
> > +	[SCU1_RESET_UART2] = { true, SCU1_RESET_CTRL2, BIT(6) },
> > +	[SCU1_RESET_UART3] = { true, SCU1_RESET_CTRL2, BIT(7) },
> > +	[SCU1_RESET_I2C_FILTER] = { true, SCU1_RESET_CTRL2, BIT(8) },
> > +	[SCU1_RESET_CALIPTRA] = { true, SCU1_RESET_CTRL2, BIT(9) },
> > +	[SCU1_RESET_XDMA] = { true, SCU1_RESET_CTRL2, BIT(10) },
> > +	[SCU1_RESET_FSI] = { true, SCU1_RESET_CTRL2, BIT(12) },
> > +	[SCU1_RESET_CAN] = { true, SCU1_RESET_CTRL2, BIT(13) },
> > +	[SCU1_RESET_MCTP] = { true, SCU1_RESET_CTRL2, BIT(14) },
> > +	[SCU1_RESET_I2C] = { true, SCU1_RESET_CTRL2, BIT(15) },
> > +	[SCU1_RESET_UART6] = { true, SCU1_RESET_CTRL2, BIT(16) },
> > +	[SCU1_RESET_UART7] = { true, SCU1_RESET_CTRL2, BIT(17) },
> > +	[SCU1_RESET_UART8] = { true, SCU1_RESET_CTRL2, BIT(18) },
> > +	[SCU1_RESET_UART9] = { true, SCU1_RESET_CTRL2, BIT(19) },
> > +	[SCU1_RESET_LTPI0] = { true, SCU1_RESET_CTRL2, BIT(20) },
> > +	[SCU1_RESET_VGAL] = { true, SCU1_RESET_CTRL2, BIT(21) },
> > +	[SCU1_RESET_LTPI1] = { true, SCU1_RESET_CTRL2, BIT(22) },
> > +	[SCU1_RESET_ACE] = { true, SCU1_RESET_CTRL2, BIT(23) },
> > +	[SCU1_RESET_E2M] = { true, SCU1_RESET_CTRL2, BIT(24) },
> > +	[SCU1_RESET_UHCI] = { true, SCU1_RESET_CTRL2, BIT(25) },
> > +	[SCU1_RESET_PORTC_USB2UART] = { true, SCU1_RESET_CTRL2,
> BIT(26) },
> > +	[SCU1_RESET_PORTC_VHUB_EHCI] = { true, SCU1_RESET_CTRL2,
> BIT(27) },
> > +	[SCU1_RESET_PORTD_USB2UART] = { true, SCU1_RESET_CTRL2,
> BIT(28) },
> > +	[SCU1_RESET_PORTD_VHUB_EHCI] = { true, SCU1_RESET_CTRL2,
> BIT(29) },
> > +	[SCU1_RESET_H2X] = { true, SCU1_RESET_CTRL2, BIT(30) },
> > +	[SCU1_RESET_I3CDMA] = { true, SCU1_RESET_CTRL2, BIT(31) },
> > +	[SCU1_RESET_PCIE2RST] = { false, SCU1_PCIE3_CTRL, BIT(0) }, };
> > +
> > +#define to_aspeed_reset(p) container_of(p, struct aspeed_reset,
> > +rcdev)
> 
> Please turn this into a static inline function.

Do you mean by following?
static inline struct aspeed_reset *to_aspeed_reset(struct reset_controller_dev *rcdev)
{
    return container_of(rcdev, struct aspeed_reset, rcdev);
}
> 
> > +static int aspeed_reset_assert(struct reset_controller_dev *rcdev,
> > +unsigned long id) {
> > +	struct aspeed_reset *rc = to_aspeed_reset(rcdev);
> > +	void __iomem *reg_offset = rc->base + rc->info->signal[id].offset;
> > +	unsigned long flags;
> > +
> > +	if (rc->info->signal[id].dedicated_clr) {
> > +		writel(rc->info->signal[id].bit, reg_offset);
> > +	} else {
> > +		spin_lock_irqsave(&rc->lock, flags);
> 
> You could use guard(spinlock_irqsave)(&rc->lock) to save a few lines.
> 
It will modify to 
		else {
			spin_lock_irqsave(&rc->lock, flags);
			writel(readl(reg_offset) & ~rc->info->signal[id].bit, reg_offset);
		}

> > +		writel(readl(reg_offset) & ~rc->info->signal[id].bit, reg_offset);
> > +		spin_unlock_irqrestore(&rc->lock, flags);
> > +	}
> > +
> > +	return 0;
> > +}
> > +
> > +static int aspeed_reset_deassert(struct reset_controller_dev *rcdev,
> > +unsigned long id) {
> > +	struct aspeed_reset *rc = to_aspeed_reset(rcdev);
> > +	void __iomem *reg_offset = rc->base + rc->info->signal[id].offset;
> > +	unsigned long flags;
> > +
> > +	if (rc->info->signal[id].dedicated_clr) {
> > +		writel(rc->info->signal[id].bit, reg_offset + 0x04);
> > +	} else {
> > +		spin_lock_irqsave(&rc->lock, flags);
> > +		writel(readl(reg_offset) | rc->info->signal[id].bit, reg_offset);
> > +		spin_unlock_irqrestore(&rc->lock, flags);
> > +	}
> > +
> > +	return 0;
> > +}
> > +
> > +static int aspeed_reset_status(struct reset_controller_dev *rcdev,
> > +unsigned long id) {
> > +	struct aspeed_reset *rc = to_aspeed_reset(rcdev);
> > +	void __iomem *reg_offset = rc->base + rc->info->signal[id].offset;
> > +
> > +	return (readl(reg_offset) & rc->info->signal[id].bit) ? 1 : 0; }
> > +
> > +static const struct reset_control_ops aspeed_reset_ops = {
> > +	.assert = aspeed_reset_assert,
> > +	.deassert = aspeed_reset_deassert,
> > +	.status = aspeed_reset_status,
> > +};
> > +
> > +static int aspeed_reset_probe(struct auxiliary_device *adev,
> > +			      const struct auxiliary_device_id *id) {
> > +	struct aspeed_reset *reset;
> > +	struct device *dev = &adev->dev;
> > +
> > +	reset = devm_kzalloc(dev, sizeof(*reset), GFP_KERNEL);
> > +	if (!reset)
> > +		return -ENOMEM;
> > +
> > +	spin_lock_init(&reset->lock);
> > +
> > +	reset->info = (struct aspeed_reset_info *)(id->driver_data);
> 
> Unnecessary parentheses.
Will update following.
reset->info = (struct aspeed_reset_info *)id->driver_data;
> 
> > +	reset->rcdev.owner = THIS_MODULE;
> > +	reset->rcdev.nr_resets = reset->info->nr_resets;
> > +	reset->rcdev.ops = &aspeed_reset_ops;
> > +	reset->rcdev.of_node = dev->parent->of_node;
> > +	reset->rcdev.dev = dev;
> > +	reset->rcdev.of_reset_n_cells = 1;
> > +	reset->base = (void __iomem *)adev->dev.platform_data;
> > +
> > +	if (!reset->base)
> > +		return -ENOMEM;
> > +
> > +	return devm_reset_controller_register(dev, &reset->rcdev); }
> > +
> > +static const struct aspeed_reset_info ast2700_reset0_info = {
> > +	.nr_resets = ARRAY_SIZE(ast2700_reset0_signals),
> > +	.signal = ast2700_reset0_signals,
> > +};
> > +
> > +static const struct aspeed_reset_info ast2700_reset1_info = {
> > +	.nr_resets = ARRAY_SIZE(ast2700_reset1_signals),
> > +	.signal = ast2700_reset1_signals,
> > +};
> > +
> > +static const struct auxiliary_device_id aspeed_reset_ids[] = {
> > +	{ .name = "clk_ast2700.reset0", .driver_data =
> (kernel_ulong_t)&ast2700_reset0_info },
> > +	{ .name = "clk_ast2700.reset1", .driver_data =
> (kernel_ulong_t)&ast2700_reset1_info },
> > +	{ }
> > +};
> > +MODULE_DEVICE_TABLE(auxiliary, aspeed_reset_ids);
> > +
> > +static struct auxiliary_driver aspeed_reset_driver = {
> > +	.probe		= aspeed_reset_probe,
> > +	.id_table	= aspeed_reset_ids,
> > +};
> > +
> > +module_auxiliary_driver(aspeed_reset_driver);
> > +
> > +MODULE_AUTHOR("Ryan Chen <ryan_chen at aspeedtech.com>");
> > +MODULE_DESCRIPTION("ASPEED SoC Reset Controller Driver");
> > +MODULE_LICENSE("GPL");
> 
> regards
> Philipp

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