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[PATCH v2] gpio: rockchip: support new version gpio

Ye Zhang posted 1 patch 1 year, 5 months ago 
drivers/gpio/gpio-rockchip.c | 40 ++++++++++++++++++++++++------------
1 file changed, 27 insertions(+), 13 deletions(-)
[PATCH v2] gpio: rockchip: support new version gpio
Posted by Ye Zhang 1 year, 5 months ago 
The next version gpio controller on SoCs like rk3576 which support four
OS operation and four interrupts

Signed-off-by: Ye Zhang <ye.zhang@rock-chips.com>
---
 drivers/gpio/gpio-rockchip.c | 40 ++++++++++++++++++++++++------------
 1 file changed, 27 insertions(+), 13 deletions(-)

diff --git a/drivers/gpio/gpio-rockchip.c b/drivers/gpio/gpio-rockchip.c
index 25ddf6a82c09..5289c94d5c60 100644
--- a/drivers/gpio/gpio-rockchip.c
+++ b/drivers/gpio/gpio-rockchip.c
@@ -29,6 +29,7 @@
 #define GPIO_TYPE_V1		(0)           /* GPIO Version ID reserved */
 #define GPIO_TYPE_V2		(0x01000C2B)  /* GPIO Version ID 0x01000C2B */
 #define GPIO_TYPE_V2_1		(0x0101157C)  /* GPIO Version ID 0x0101157C */
+#define GPIO_TYPE_V2_2		(0x010219C8)  /* GPIO Version ID 0x010219C8 */
 
 static const struct rockchip_gpio_regs gpio_regs_v1 = {
 	.port_dr = 0x00,
@@ -78,7 +79,7 @@ static inline void rockchip_gpio_writel(struct rockchip_pin_bank *bank,
 {
 	void __iomem *reg = bank->reg_base + offset;
 
-	if (bank->gpio_type == GPIO_TYPE_V2)
+	if (bank->gpio_type >= GPIO_TYPE_V2)
 		gpio_writel_v2(value, reg);
 	else
 		writel(value, reg);
@@ -90,7 +91,7 @@ static inline u32 rockchip_gpio_readl(struct rockchip_pin_bank *bank,
 	void __iomem *reg = bank->reg_base + offset;
 	u32 value;
 
-	if (bank->gpio_type == GPIO_TYPE_V2)
+	if (bank->gpio_type >= GPIO_TYPE_V2)
 		value = gpio_readl_v2(reg);
 	else
 		value = readl(reg);
@@ -105,7 +106,7 @@ static inline void rockchip_gpio_writel_bit(struct rockchip_pin_bank *bank,
 	void __iomem *reg = bank->reg_base + offset;
 	u32 data;
 
-	if (bank->gpio_type == GPIO_TYPE_V2) {
+	if (bank->gpio_type >= GPIO_TYPE_V2) {
 		if (value)
 			data = BIT(bit % 16) | BIT(bit % 16 + 16);
 		else
@@ -126,7 +127,7 @@ static inline u32 rockchip_gpio_readl_bit(struct rockchip_pin_bank *bank,
 	void __iomem *reg = bank->reg_base + offset;
 	u32 data;
 
-	if (bank->gpio_type == GPIO_TYPE_V2) {
+	if (bank->gpio_type >= GPIO_TYPE_V2) {
 		data = readl(bit >= 16 ? reg + 0x4 : reg);
 		data >>= bit % 16;
 	} else {
@@ -204,18 +205,24 @@ static int rockchip_gpio_set_debounce(struct gpio_chip *gc,
 	unsigned int cur_div_reg;
 	u64 div;
 
-	div_debounce_support = (bank->gpio_type == GPIO_TYPE_V2) && !IS_ERR(bank->db_clk);
+	div_debounce_support = (bank->gpio_type >= GPIO_TYPE_V2) && !IS_ERR(bank->db_clk);
 	if (debounce && div_debounce_support) {
 		freq = clk_get_rate(bank->db_clk);
 		if (!freq)
 			return -EINVAL;
 		div = (u64)(GENMASK(23, 0) + 1) * 1000000;
-		max_debounce = DIV_ROUND_CLOSEST_ULL(div, freq);
+		if (bank->gpio_type == GPIO_TYPE_V2)
+			max_debounce = DIV_ROUND_CLOSEST_ULL(div, freq);
+		else
+			max_debounce = DIV_ROUND_CLOSEST_ULL(div, 2 * freq);
 		if (debounce > max_debounce)
 			return -EINVAL;
 
 		div = (u64)debounce * freq;
-		div_reg = DIV_ROUND_CLOSEST_ULL(div, USEC_PER_SEC) - 1;
+		if (bank->gpio_type == GPIO_TYPE_V2)
+			div_reg = DIV_ROUND_CLOSEST_ULL(div, USEC_PER_SEC) - 1;
+		else
+			div_reg = DIV_ROUND_CLOSEST_ULL(div, USEC_PER_SEC / 2) - 1;
 	}
 
 	raw_spin_lock_irqsave(&bank->slock, flags);
@@ -401,7 +408,7 @@ static int rockchip_irq_set_type(struct irq_data *d, unsigned int type)
 	polarity = rockchip_gpio_readl(bank, bank->gpio_regs->int_polarity);
 
 	if (type == IRQ_TYPE_EDGE_BOTH) {
-		if (bank->gpio_type == GPIO_TYPE_V2) {
+		if (bank->gpio_type >= GPIO_TYPE_V2) {
 			rockchip_gpio_writel_bit(bank, d->hwirq, 1,
 						 bank->gpio_regs->int_bothedge);
 			goto out;
@@ -420,7 +427,7 @@ static int rockchip_irq_set_type(struct irq_data *d, unsigned int type)
 				polarity |= mask;
 		}
 	} else {
-		if (bank->gpio_type == GPIO_TYPE_V2) {
+		if (bank->gpio_type >= GPIO_TYPE_V2) {
 			rockchip_gpio_writel_bit(bank, d->hwirq, 0,
 						 bank->gpio_regs->int_bothedge);
 		} else {
@@ -526,7 +533,7 @@ static int rockchip_interrupts_register(struct rockchip_pin_bank *bank)
 	}
 
 	gc = irq_get_domain_generic_chip(bank->domain, 0);
-	if (bank->gpio_type == GPIO_TYPE_V2) {
+	if (bank->gpio_type >= GPIO_TYPE_V2) {
 		gc->reg_writel = gpio_writel_v2;
 		gc->reg_readl = gpio_readl_v2;
 	}
@@ -648,13 +655,20 @@ static int rockchip_get_bank_data(struct rockchip_pin_bank *bank)
 
 	id = readl(bank->reg_base + gpio_regs_v2.version_id);
 
-	/* If not gpio v2, that is default to v1. */
-	if (id == GPIO_TYPE_V2 || id == GPIO_TYPE_V2_1) {
+	switch (id) {
+	case GPIO_TYPE_V2:
+	case GPIO_TYPE_V2_1:
 		bank->gpio_regs = &gpio_regs_v2;
 		bank->gpio_type = GPIO_TYPE_V2;
-	} else {
+		break;
+	case GPIO_TYPE_V2_2:
+		bank->gpio_regs = &gpio_regs_v2;
+		bank->gpio_type = GPIO_TYPE_V2_2;
+		break;
+	default:
 		bank->gpio_regs = &gpio_regs_v1;
 		bank->gpio_type = GPIO_TYPE_V1;
+		pr_info("Note: Use default GPIO_TYPE_V1!\n");
 	}
 
 	return 0;
-- 
2.34.1
Re: [PATCH v2] gpio: rockchip: support new version gpio
Posted by Andy Shevchenko 1 year, 5 months ago 
On Fri, Aug 23, 2024 at 11:43:11AM +0800, Ye Zhang wrote:
> The next version gpio controller on SoCs like rk3576 which support four
> OS operation and four interrupts

...

>  #define GPIO_TYPE_V2		(0x01000C2B)  /* GPIO Version ID 0x01000C2B */
>  #define GPIO_TYPE_V2_1		(0x0101157C)  /* GPIO Version ID 0x0101157C */
> +#define GPIO_TYPE_V2_2		(0x010219C8)  /* GPIO Version ID 0x010219C8 */

These needs a bit of decoding. As far as I can decipher these it's something like

0x01 00 00 00 ???

0x00 xx 00 00 // seems like a subversion, 2.xx

0x00 00 xx xx // seems like a release which is

3115
5500
6600

in decimal representation.

But again, can you make the comments better explaining these cryptic 4-byte
values?

With that done it might be better approach to check the version of the IP.

...

> +	switch (id) {
> +	case GPIO_TYPE_V2:
> +	case GPIO_TYPE_V2_1:
>  		bank->gpio_regs = &gpio_regs_v2;
>  		bank->gpio_type = GPIO_TYPE_V2;
> -	} else {
> +		break;
> +	case GPIO_TYPE_V2_2:
> +		bank->gpio_regs = &gpio_regs_v2;
> +		bank->gpio_type = GPIO_TYPE_V2_2;
> +		break;
> +	default:
>  		bank->gpio_regs = &gpio_regs_v1;
>  		bank->gpio_type = GPIO_TYPE_V1;
> +		pr_info("Note: Use default GPIO_TYPE_V1!\n");

Missed break;

>  	}

-- 
With Best Regards,
Andy Shevchenko
Re: [PATCH v2] gpio: rockchip: support new version gpio
Posted by Sebastian Reichel 1 year, 5 months ago 
Hi,

On Fri, Aug 23, 2024 at 11:43:11AM GMT, Ye Zhang wrote:
> The next version gpio controller on SoCs like rk3576 which support four
> OS operation and four interrupts
> 
> Signed-off-by: Ye Zhang <ye.zhang@rock-chips.com>
> ---
>  drivers/gpio/gpio-rockchip.c | 40 ++++++++++++++++++++++++------------
>  1 file changed, 27 insertions(+), 13 deletions(-)
> 
> diff --git a/drivers/gpio/gpio-rockchip.c b/drivers/gpio/gpio-rockchip.c
> index 25ddf6a82c09..5289c94d5c60 100644
> --- a/drivers/gpio/gpio-rockchip.c
> +++ b/drivers/gpio/gpio-rockchip.c
> @@ -29,6 +29,7 @@
>  #define GPIO_TYPE_V1		(0)           /* GPIO Version ID reserved */
>  #define GPIO_TYPE_V2		(0x01000C2B)  /* GPIO Version ID 0x01000C2B */
>  #define GPIO_TYPE_V2_1		(0x0101157C)  /* GPIO Version ID 0x0101157C */
> +#define GPIO_TYPE_V2_2		(0x010219C8)  /* GPIO Version ID 0x010219C8 */

The comments for anything but the V1 define are redundant.

[...]

> @@ -648,13 +655,20 @@ static int rockchip_get_bank_data(struct rockchip_pin_bank *bank)
>  
>  	id = readl(bank->reg_base + gpio_regs_v2.version_id);
>  
> -	/* If not gpio v2, that is default to v1. */
> -	if (id == GPIO_TYPE_V2 || id == GPIO_TYPE_V2_1) {
> +	switch (id) {
> +	case GPIO_TYPE_V2:
> +	case GPIO_TYPE_V2_1:
>  		bank->gpio_regs = &gpio_regs_v2;
>  		bank->gpio_type = GPIO_TYPE_V2;
> -	} else {
> +		break;
> +	case GPIO_TYPE_V2_2:
> +		bank->gpio_regs = &gpio_regs_v2;
> +		bank->gpio_type = GPIO_TYPE_V2_2;
> +		break;

Can't this just be handled like GPIO_TYPE_V2_1 (i.e. reusing the V2
case)? Also it looks risky to use >= on gpio_type. GPIO_TYPE_V2_2
looks like a simple enum, but it contains the ID. Is it guranteed to
be increasing? In that case any ID > GPIO_TYPE_V2_2 should not
default to GPIO_TYPE_V1?

> +	default:
>  		bank->gpio_regs = &gpio_regs_v1;
>  		bank->gpio_type = GPIO_TYPE_V1;
> +		pr_info("Note: Use default GPIO_TYPE_V1!\n");

Can we have a list of valid V1 IDs and default to -ENODEV?

Greetings,

-- Sebastian

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