[RFC PATCH 4/4] pinctrl: renesas: pinctrl-rzg2l: Add support to get/set drive-strength and output-impedance

From: Lad Prabhakar
Date: Thu Sep 30 2021 - 08:17:37 EST

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Previous message: Lad Prabhakar: "[RFC PATCH 3/4] dt-bindings: pinctrl: renesas,rzg2l-pinctrl: Add output-impedance property"
In reply to: Lad Prabhakar: "[RFC PATCH 3/4] dt-bindings: pinctrl: renesas,rzg2l-pinctrl: Add output-impedance property"
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Add support to get/set drive-strength and output-impedance of the pins.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@xxxxxxxxxxxxxx>
---
drivers/pinctrl/renesas/pinctrl-rzg2l.c | 181 +++++++++++++++++++-----
1 file changed, 148 insertions(+), 33 deletions(-)

diff --git a/drivers/pinctrl/renesas/pinctrl-rzg2l.c b/drivers/pinctrl/renesas/pinctrl-rzg2l.c
index 20b2af889ca9..d75b31ca33ab 100644
--- a/drivers/pinctrl/renesas/pinctrl-rzg2l.c
+++ b/drivers/pinctrl/renesas/pinctrl-rzg2l.c
@@ -47,6 +47,7 @@
#define PIN_CFG_FILONOFF BIT(9)
#define PIN_CFG_FILNUM BIT(10)
#define PIN_CFG_FILCLKSEL BIT(11)
+#define PIN_CFG_GROUP_B BIT(12)

#define RZG2L_MPXED_PIN_FUNCS (PIN_CFG_IOLH | \
PIN_CFG_SR | \
@@ -86,6 +87,7 @@
#define PMC(n) (0x0200 + 0x10 + (n))
#define PFC(n) (0x0400 + 0x40 + (n) * 4)
#define PIN(n) (0x0800 + 0x10 + (n))
+#define IOLH(n) (0x1010 + (n) * 8 - 0x10)
#define IEN(n) (0x1800 + (n) * 8)
#define PWPR (0x3014)
#define SD_CH(n) (0x3000 + (n) * 4)
@@ -101,6 +103,7 @@
#define PVDD_MASK 0x01
#define PFC_MASK 0x07
#define IEN_MASK 0x01
+#define IOLH_MASK 0x03

#define PM_INPUT 0x1
#define PM_OUTPUT 0x2
@@ -424,6 +427,23 @@ static int rzg2l_dt_node_to_map(struct pinctrl_dev *pctldev,
return ret;
}

+static int rzg2l_validate_gpio_pin(struct rzg2l_pinctrl *pctrl,
+ u32 cfg, u32 port, u8 bit)
+{
+ u8 pincount = RZG2L_GPIO_PORT_GET_PINCNT(cfg);
+ u32 port_index = RZG2L_GPIO_PORT_GET_INDEX(cfg);
+ u32 data;
+
+ if (bit >= pincount || port >= pctrl->data->n_port_pins)
+ return -EINVAL;
+
+ data = pctrl->data->port_pin_configs[port];
+ if (port_index != RZG2L_GPIO_PORT_GET_INDEX(data))
+ return -EINVAL;
+
+ return 0;
+}
+
static int rzg2l_pinctrl_pinconf_get(struct pinctrl_dev *pctldev,
unsigned int _pin,
unsigned long *config)
@@ -432,6 +452,7 @@ static int rzg2l_pinctrl_pinconf_get(struct pinctrl_dev *pctldev,
enum pin_config_param param = pinconf_to_config_param(*config);
const struct pinctrl_pin_desc *pin = &pctrl->desc.pins[_pin];
unsigned int *pin_data = pin->drv_data;
+ bool groupb_pin = false;
unsigned int arg = 0;
unsigned long flags;
void __iomem *addr;
@@ -446,6 +467,14 @@ static int rzg2l_pinctrl_pinconf_get(struct pinctrl_dev *pctldev,
port = RZG2L_SINGLE_PIN_GET_PORT(*pin_data);
cfg = RZG2L_SINGLE_PIN_GET_CFGS(*pin_data);
bit = RZG2L_SINGLE_PIN_GET_BIT(*pin_data);
+ groupb_pin = cfg & PIN_CFG_GROUP_B;
+ } else {
+ cfg = RZG2L_GPIO_PORT_GET_CFGS(*pin_data);
+ port = RZG2L_PIN_ID_TO_PORT(_pin);
+ bit = RZG2L_PIN_ID_TO_PIN(_pin);
+
+ if (rzg2l_validate_gpio_pin(pctrl, *pin_data, port, bit))
+ return -EINVAL;
}

switch (param) {
@@ -484,6 +513,38 @@ static int rzg2l_pinctrl_pinconf_get(struct pinctrl_dev *pctldev,
break;
}

+ case PIN_CONFIG_OUTPUT_IMPEDANCE:
+ case PIN_CONFIG_DRIVE_STRENGTH: {
+ unsigned int mA[4] = { 2, 4, 8, 12 };
+ unsigned int oi[4] = { 100, 66, 50, 33 };
+
+ if (param == PIN_CONFIG_DRIVE_STRENGTH) {
+ if (!(cfg & PIN_CFG_IOLH) || groupb_pin)
+ return -EINVAL;
+ } else {
+ if (!(cfg & PIN_CFG_IOLH) || !groupb_pin)
+ return -EINVAL;
+ }
+
+ spin_lock_irqsave(&pctrl->lock, flags);
+
+ /* handle _L/_H for 32-bit register read/write */
+ addr = pctrl->base + IOLH(port);
+ if (bit >= 4) {
+ bit -= 4;
+ addr += 4;
+ }
+
+ reg = readl(addr) & (IOLH_MASK << (bit * 8));
+ reg = reg >> (bit * 8);
+ if (param == PIN_CONFIG_DRIVE_STRENGTH)
+ arg = mA[reg];
+ else
+ arg = oi[reg];
+ spin_unlock_irqrestore(&pctrl->lock, flags);
+ break;
+ }
+
default:
return -ENOTSUPP;
}
@@ -502,6 +563,7 @@ static int rzg2l_pinctrl_pinconf_set(struct pinctrl_dev *pctldev,
const struct pinctrl_pin_desc *pin = &pctrl->desc.pins[_pin];
unsigned int *pin_data = pin->drv_data;
enum pin_config_param param;
+ bool groupb_pin = false;
unsigned long flags;
void __iomem *addr;
u32 port = 0, reg;
@@ -516,6 +578,14 @@ static int rzg2l_pinctrl_pinconf_set(struct pinctrl_dev *pctldev,
port = RZG2L_SINGLE_PIN_GET_PORT(*pin_data);
cfg = RZG2L_SINGLE_PIN_GET_CFGS(*pin_data);
bit = RZG2L_SINGLE_PIN_GET_BIT(*pin_data);
+ groupb_pin = cfg & PIN_CFG_GROUP_B;
+ } else {
+ cfg = RZG2L_GPIO_PORT_GET_CFGS(*pin_data);
+ port = RZG2L_PIN_ID_TO_PORT(_pin);
+ bit = RZG2L_PIN_ID_TO_PIN(_pin);
+
+ if (rzg2l_validate_gpio_pin(pctrl, *pin_data, port, bit))
+ return -EINVAL;
}

for (i = 0; i < num_configs; i++) {
@@ -564,6 +634,51 @@ static int rzg2l_pinctrl_pinconf_set(struct pinctrl_dev *pctldev,
spin_unlock_irqrestore(&pctrl->lock, flags);
break;
}
+
+ case PIN_CONFIG_OUTPUT_IMPEDANCE:
+ case PIN_CONFIG_DRIVE_STRENGTH: {
+ unsigned int arg = pinconf_to_config_argument(_configs[i]);
+ unsigned int mA[4] = { 2, 4, 8, 12 };
+ unsigned int oi[4] = { 100, 66, 50, 33 };
+
+ if (param == PIN_CONFIG_DRIVE_STRENGTH) {
+ if (!(cfg & PIN_CFG_IOLH) || groupb_pin)
+ return -EINVAL;
+
+ for (i = 0; i < ARRAY_SIZE(mA); i++) {
+ if (arg == mA[i])
+ break;
+ }
+
+ if (i >= ARRAY_SIZE(mA))
+ return -EINVAL;
+ } else {
+ if (!(cfg & PIN_CFG_IOLH) || !groupb_pin)
+ return -EINVAL;
+
+ for (i = 0; i < ARRAY_SIZE(oi); i++) {
+ if (arg == oi[i])
+ break;
+ }
+ if (i >= ARRAY_SIZE(oi))
+ return -EINVAL;
+ }
+
+ spin_lock_irqsave(&pctrl->lock, flags);
+
+ /* handle _L/_H for 32-bit register read/write */
+ addr = pctrl->base + IOLH(port);
+ if (bit >= 4) {
+ bit -= 4;
+ addr += 4;
+ }
+
+ reg = readl(addr) & ~(IOLH_MASK << (bit * 8));
+ writel(reg | (i << (bit * 8)), addr);
+ spin_unlock_irqrestore(&pctrl->lock, flags);
+ break;
+ }
+
default:
return -EOPNOTSUPP;
}
@@ -893,70 +1008,70 @@ static struct rzg2l_dedicated_configs rzg2l_dedicated_pins[] = {
(PIN_CFG_SR | PIN_CFG_IOLH | PIN_CFG_IEN)) },
{ "TDO", RZG2L_SINGLE_PIN_PACK(0x3, 0,
(PIN_CFG_IOLH | PIN_CFG_SR | PIN_CFG_IEN)) },
- { "AUDIO_CLK1", RZG2L_SINGLE_PIN_PACK(0x4, 0, PIN_CFG_IEN) },
- { "AUDIO_CLK2", RZG2L_SINGLE_PIN_PACK(0x4, 1, PIN_CFG_IEN) },
+ { "AUDIO_CLK1", RZG2L_SINGLE_PIN_PACK(0x4, 0, PIN_CFG_IEN | PIN_CFG_GROUP_B) },
+ { "AUDIO_CLK2", RZG2L_SINGLE_PIN_PACK(0x4, 1, PIN_CFG_IEN | PIN_CFG_GROUP_B) },
{ "SD0_CLK", RZG2L_SINGLE_PIN_PACK(0x6, 0,
- (PIN_CFG_IOLH | PIN_CFG_SR | PIN_CFG_IOLH_SD0)) },
+ (PIN_CFG_IOLH | PIN_CFG_SR | PIN_CFG_IOLH_SD0 | PIN_CFG_GROUP_B)) },
{ "SD0_CMD", RZG2L_SINGLE_PIN_PACK(0x6, 1,
- (PIN_CFG_IOLH | PIN_CFG_SR | PIN_CFG_IEN | PIN_CFG_IOLH_SD0)) },
+ (PIN_CFG_IOLH | PIN_CFG_SR | PIN_CFG_IEN | PIN_CFG_IOLH_SD0 | PIN_CFG_GROUP_B)) },
{ "SD0_RST#", RZG2L_SINGLE_PIN_PACK(0x6, 2,
- (PIN_CFG_IOLH | PIN_CFG_SR | PIN_CFG_IOLH_SD0)) },
+ (PIN_CFG_IOLH | PIN_CFG_SR | PIN_CFG_IOLH_SD0 | PIN_CFG_GROUP_B)) },
{ "SD0_DATA0", RZG2L_SINGLE_PIN_PACK(0x7, 0,
- (PIN_CFG_IOLH | PIN_CFG_SR | PIN_CFG_IEN | PIN_CFG_IOLH_SD0)) },
+ (PIN_CFG_IOLH | PIN_CFG_SR | PIN_CFG_IEN | PIN_CFG_IOLH_SD0 | PIN_CFG_GROUP_B)) },
{ "SD0_DATA1", RZG2L_SINGLE_PIN_PACK(0x7, 1,
- (PIN_CFG_IOLH | PIN_CFG_SR | PIN_CFG_IEN | PIN_CFG_IOLH_SD0)) },
+ (PIN_CFG_IOLH | PIN_CFG_SR | PIN_CFG_IEN | PIN_CFG_IOLH_SD0 | PIN_CFG_GROUP_B)) },
{ "SD0_DATA2", RZG2L_SINGLE_PIN_PACK(0x7, 2,
- (PIN_CFG_IOLH | PIN_CFG_SR | PIN_CFG_IEN | PIN_CFG_IOLH_SD0)) },
+ (PIN_CFG_IOLH | PIN_CFG_SR | PIN_CFG_IEN | PIN_CFG_IOLH_SD0 | PIN_CFG_GROUP_B)) },
{ "SD0_DATA3", RZG2L_SINGLE_PIN_PACK(0x7, 3,
- (PIN_CFG_IOLH | PIN_CFG_SR | PIN_CFG_IEN | PIN_CFG_IOLH_SD0)) },
+ (PIN_CFG_IOLH | PIN_CFG_SR | PIN_CFG_IEN | PIN_CFG_IOLH_SD0 | PIN_CFG_GROUP_B)) },
{ "SD0_DATA4", RZG2L_SINGLE_PIN_PACK(0x7, 4,
- (PIN_CFG_IOLH | PIN_CFG_SR | PIN_CFG_IEN | PIN_CFG_IOLH_SD0)) },
+ (PIN_CFG_IOLH | PIN_CFG_SR | PIN_CFG_IEN | PIN_CFG_IOLH_SD0 | PIN_CFG_GROUP_B)) },
{ "SD0_DATA5", RZG2L_SINGLE_PIN_PACK(0x7, 5,
- (PIN_CFG_IOLH | PIN_CFG_SR | PIN_CFG_IEN | PIN_CFG_IOLH_SD0)) },
+ (PIN_CFG_IOLH | PIN_CFG_SR | PIN_CFG_IEN | PIN_CFG_IOLH_SD0 | PIN_CFG_GROUP_B)) },
{ "SD0_DATA6", RZG2L_SINGLE_PIN_PACK(0x7, 6,
- (PIN_CFG_IOLH | PIN_CFG_SR | PIN_CFG_IEN | PIN_CFG_IOLH_SD0)) },
+ (PIN_CFG_IOLH | PIN_CFG_SR | PIN_CFG_IEN | PIN_CFG_IOLH_SD0 | PIN_CFG_GROUP_B)) },
{ "SD0_DATA7", RZG2L_SINGLE_PIN_PACK(0x7, 7,
- (PIN_CFG_IOLH | PIN_CFG_SR | PIN_CFG_IEN | PIN_CFG_IOLH_SD0)) },
+ (PIN_CFG_IOLH | PIN_CFG_SR | PIN_CFG_IEN | PIN_CFG_IOLH_SD0 | PIN_CFG_GROUP_B)) },
{ "SD1_CLK", RZG2L_SINGLE_PIN_PACK(0x8, 0,
- (PIN_CFG_IOLH | PIN_CFG_SR | PIN_CFG_IOLH_SD1))},
+ (PIN_CFG_IOLH | PIN_CFG_SR | PIN_CFG_IOLH_SD1 | PIN_CFG_GROUP_B)) },
{ "SD1_CMD", RZG2L_SINGLE_PIN_PACK(0x8, 1,
- (PIN_CFG_IOLH | PIN_CFG_SR | PIN_CFG_IEN | PIN_CFG_IOLH_SD1)) },
+ (PIN_CFG_IOLH | PIN_CFG_SR | PIN_CFG_IEN | PIN_CFG_IOLH_SD1 | PIN_CFG_GROUP_B)) },
{ "SD1_DATA0", RZG2L_SINGLE_PIN_PACK(0x9, 0,
- (PIN_CFG_IOLH | PIN_CFG_SR | PIN_CFG_IEN | PIN_CFG_IOLH_SD1)) },
+ (PIN_CFG_IOLH | PIN_CFG_SR | PIN_CFG_IEN | PIN_CFG_IOLH_SD1 | PIN_CFG_GROUP_B)) },
{ "SD1_DATA1", RZG2L_SINGLE_PIN_PACK(0x9, 1,
- (PIN_CFG_IOLH | PIN_CFG_SR | PIN_CFG_IEN | PIN_CFG_IOLH_SD1)) },
+ (PIN_CFG_IOLH | PIN_CFG_SR | PIN_CFG_IEN | PIN_CFG_IOLH_SD1 | PIN_CFG_GROUP_B)) },
{ "SD1_DATA2", RZG2L_SINGLE_PIN_PACK(0x9, 2,
- (PIN_CFG_IOLH | PIN_CFG_SR | PIN_CFG_IEN | PIN_CFG_IOLH_SD1)) },
+ (PIN_CFG_IOLH | PIN_CFG_SR | PIN_CFG_IEN | PIN_CFG_IOLH_SD1 | PIN_CFG_GROUP_B)) },
{ "SD1_DATA3", RZG2L_SINGLE_PIN_PACK(0x9, 3,
- (PIN_CFG_IOLH | PIN_CFG_SR | PIN_CFG_IEN | PIN_CFG_IOLH_SD1)) },
+ (PIN_CFG_IOLH | PIN_CFG_SR | PIN_CFG_IEN | PIN_CFG_IOLH_SD1 | PIN_CFG_GROUP_B)) },
{ "QSPI0_SPCLK", RZG2L_SINGLE_PIN_PACK(0xa, 0,
- (PIN_CFG_IOLH | PIN_CFG_SR | PIN_CFG_IOLH_QSPI)) },
+ (PIN_CFG_IOLH | PIN_CFG_SR | PIN_CFG_IOLH_QSPI | PIN_CFG_GROUP_B)) },
{ "QSPI0_IO0", RZG2L_SINGLE_PIN_PACK(0xa, 1,
- (PIN_CFG_IOLH | PIN_CFG_SR | PIN_CFG_IOLH_QSPI)) },
+ (PIN_CFG_IOLH | PIN_CFG_SR | PIN_CFG_IOLH_QSPI | PIN_CFG_GROUP_B)) },
{ "QSPI0_IO1", RZG2L_SINGLE_PIN_PACK(0xa, 2,
- (PIN_CFG_IOLH | PIN_CFG_SR | PIN_CFG_IOLH_QSPI)) },
+ (PIN_CFG_IOLH | PIN_CFG_SR | PIN_CFG_IOLH_QSPI | PIN_CFG_GROUP_B)) },
{ "QSPI0_IO2", RZG2L_SINGLE_PIN_PACK(0xa, 3,
- (PIN_CFG_IOLH | PIN_CFG_SR | PIN_CFG_IOLH_QSPI)) },
+ (PIN_CFG_IOLH | PIN_CFG_SR | PIN_CFG_IOLH_QSPI | PIN_CFG_GROUP_B)) },
{ "QSPI0_IO3", RZG2L_SINGLE_PIN_PACK(0xa, 4,
- (PIN_CFG_IOLH | PIN_CFG_SR | PIN_CFG_IOLH_QSPI)) },
+ (PIN_CFG_IOLH | PIN_CFG_SR | PIN_CFG_IOLH_QSPI | PIN_CFG_GROUP_B)) },
{ "QSPI0_SSL", RZG2L_SINGLE_PIN_PACK(0xa, 5,
- (PIN_CFG_IOLH | PIN_CFG_SR | PIN_CFG_IOLH_QSPI)) },
+ (PIN_CFG_IOLH | PIN_CFG_SR | PIN_CFG_IOLH_QSPI | PIN_CFG_GROUP_B)) },
{ "QSPI1_SPCLK", RZG2L_SINGLE_PIN_PACK(0xb, 0,
- (PIN_CFG_IOLH | PIN_CFG_SR | PIN_CFG_IOLH_QSPI)) },
+ (PIN_CFG_IOLH | PIN_CFG_SR | PIN_CFG_IOLH_QSPI | PIN_CFG_GROUP_B)) },
{ "QSPI1_IO0", RZG2L_SINGLE_PIN_PACK(0xb, 1,
- (PIN_CFG_IOLH | PIN_CFG_SR | PIN_CFG_IOLH_QSPI)) },
+ (PIN_CFG_IOLH | PIN_CFG_SR | PIN_CFG_IOLH_QSPI | PIN_CFG_GROUP_B)) },
{ "QSPI1_IO1", RZG2L_SINGLE_PIN_PACK(0xb, 2,
- (PIN_CFG_IOLH | PIN_CFG_SR | PIN_CFG_IOLH_QSPI)) },
+ (PIN_CFG_IOLH | PIN_CFG_SR | PIN_CFG_IOLH_QSPI | PIN_CFG_GROUP_B)) },
{ "QSPI1_IO2", RZG2L_SINGLE_PIN_PACK(0xb, 3,
- (PIN_CFG_IOLH | PIN_CFG_SR | PIN_CFG_IOLH_QSPI)) },
+ (PIN_CFG_IOLH | PIN_CFG_SR | PIN_CFG_IOLH_QSPI | PIN_CFG_GROUP_B)) },
{ "QSPI1_IO3", RZG2L_SINGLE_PIN_PACK(0xb, 4,
- (PIN_CFG_IOLH | PIN_CFG_SR | PIN_CFG_IOLH_QSPI)) },
+ (PIN_CFG_IOLH | PIN_CFG_SR | PIN_CFG_IOLH_QSPI | PIN_CFG_GROUP_B)) },
{ "QSPI1_SSL", RZG2L_SINGLE_PIN_PACK(0xb, 5,
- (PIN_CFG_IOLH | PIN_CFG_SR | PIN_CFG_IOLH_QSPI)) },
+ (PIN_CFG_IOLH | PIN_CFG_SR | PIN_CFG_IOLH_QSPI | PIN_CFG_GROUP_B)) },
{ "QSPI_RESET#", RZG2L_SINGLE_PIN_PACK(0xc, 0,
- (PIN_CFG_IOLH | PIN_CFG_SR | PIN_CFG_IOLH_QSPI)) },
+ (PIN_CFG_IOLH | PIN_CFG_SR | PIN_CFG_IOLH_QSPI | PIN_CFG_GROUP_B)) },
{ "QSPI_WP#", RZG2L_SINGLE_PIN_PACK(0xc, 1,
- (PIN_CFG_IOLH | PIN_CFG_SR | PIN_CFG_IOLH_QSPI)) },
+ (PIN_CFG_IOLH | PIN_CFG_SR | PIN_CFG_IOLH_QSPI | PIN_CFG_GROUP_B)) },
{ "QSPI_INT#", RZG2L_SINGLE_PIN_PACK(0xc, 2, (PIN_CFG_SR | PIN_CFG_IOLH_QSPI)) },
{ "WDTOVF_PERROUT#", RZG2L_SINGLE_PIN_PACK(0xd, 0, (PIN_CFG_IOLH | PIN_CFG_SR)) },
{ "RIIC0_SDA", RZG2L_SINGLE_PIN_PACK(0xe, 0, PIN_CFG_IEN) },
--
2.17.1

Next message: Jan Beulich: "[PATCH v2 3/9] xen/x86: make "earlyprintk=xen" work better for PVH Dom0"
Previous message: Lad Prabhakar: "[RFC PATCH 3/4] dt-bindings: pinctrl: renesas,rzg2l-pinctrl: Add output-impedance property"
In reply to: Lad Prabhakar: "[RFC PATCH 3/4] dt-bindings: pinctrl: renesas,rzg2l-pinctrl: Add output-impedance property"
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