[PATCH v2 06/11] pinctrl: renesas: rzg2l: Add output enable support

From: Claudiu
Date: Thu Dec 07 2023 - 02:08:36 EST

From: Claudiu Beznea <claudiu.beznea.uj@xxxxxxxxxxxxxx>

Some of the Ethernet pins on RZ/G3S (but also valid for RZ/G2L) need to
have the direction of the IO buffer set as output for Ethernet to work
properly. On RZ/G3S, these pins are P1_0/P7_0, P1_1/P7_1 which could have
the following Ethernet functions: TXC/TX_CLK or TX_CTL/TX_EN.

As the pins supporting output enable are SoC specific and there is a
limited number of these pins (TXC/TX_CLK and/or TX_CTL/TX_EN), for proper
validation the output enable capable port limits were specified on
platform-based configuration data structure.

The OEN support has been intantiated for RZ/G3S at the moment.

Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@xxxxxxxxxxxxxx>
---

Changes in v2:
- use 8 bit helpers to get/set value of output enable register
- adapted to code to work for both RZ/G2L based devices and RZ/G3S
- removed IEN capability for Ethernet pins and added it in a separate
patch (patch 07/12)


drivers/pinctrl/renesas/pinctrl-rzg2l.c | 87 ++++++++++++++++++++++++-
1 file changed, 85 insertions(+), 2 deletions(-)

diff --git a/drivers/pinctrl/renesas/pinctrl-rzg2l.c b/drivers/pinctrl/renesas/pinctrl-rzg2l.c
index 6b082161e821..0c05ccd03eb2 100644
--- a/drivers/pinctrl/renesas/pinctrl-rzg2l.c
+++ b/drivers/pinctrl/renesas/pinctrl-rzg2l.c
@@ -57,6 +57,7 @@
#define PIN_CFG_FILCLKSEL BIT(12)
#define PIN_CFG_IOLH_C BIT(13)
#define PIN_CFG_SOFT_PS BIT(14)
+#define PIN_CFG_OEN BIT(15)

#define RZG2L_MPXED_COMMON_PIN_FUNCS(group) \
(PIN_CFG_IOLH_##group | \
@@ -109,6 +110,7 @@
#define SD_CH(off, ch) ((off) + (ch) * 4)
#define ETH_POC(off, ch) ((off) + (ch) * 4)
#define QSPI (0x3008)
+#define ETH_MODE (0x3018)

#define PVDD_2500 2 /* I/O domain voltage 2.5V */
#define PVDD_1800 1 /* I/O domain voltage <= 1.8V */
@@ -170,6 +172,8 @@ enum rzg2l_iolh_index {
* @iolh_groupb_oi: IOLH group B output impedance specific values
* @drive_strength_ua: drive strength in uA is supported (otherwise mA is supported)
* @func_base: base number for port function (see register PFC)
+ * @oen_max_pin: the maximum pin number supporting output enable
+ * @oen_max_port: the maximum port number supporting output enable
*/
struct rzg2l_hwcfg {
const struct rzg2l_register_offsets regs;
@@ -179,6 +183,8 @@ struct rzg2l_hwcfg {
u16 iolh_groupb_oi[4];
bool drive_strength_ua;
u8 func_base;
+ u8 oen_max_pin;
+ u8 oen_max_port;
};

struct rzg2l_dedicated_configs {
@@ -782,6 +788,66 @@ static bool rzg2l_ds_is_supported(struct rzg2l_pinctrl *pctrl, u32 caps,
return false;
}

+static bool rzg2l_oen_is_supported(u32 caps, u8 pin, u8 max_pin)
+{
+ if (!(caps & PIN_CFG_OEN))
+ return false;
+
+ if (pin > max_pin)
+ return false;
+
+ return true;
+}
+
+static u8 rzg2l_pin_to_oen_bit(u32 offset, u8 pin, u8 max_port)
+{
+ if (pin)
+ pin *= 2;
+
+ if (offset / RZG2L_PINS_PER_PORT == max_port)
+ pin += 1;
+
+ return pin;
+}
+
+static u32 rzg2l_read_oen(struct rzg2l_pinctrl *pctrl, u32 caps, u32 offset, u8 pin)
+{
+ u8 max_port = pctrl->data->hwcfg->oen_max_port;
+ u8 max_pin = pctrl->data->hwcfg->oen_max_pin;
+ u8 bit;
+
+ if (!rzg2l_oen_is_supported(caps, pin, max_pin))
+ return 0;
+
+ bit = rzg2l_pin_to_oen_bit(offset, pin, max_port);
+
+ return !(readb(pctrl->base + ETH_MODE) & BIT(bit));
+}
+
+static int rzg2l_write_oen(struct rzg2l_pinctrl *pctrl, u32 caps, u32 offset, u8 pin, u8 oen)
+{
+ u8 max_port = pctrl->data->hwcfg->oen_max_port;
+ u8 max_pin = pctrl->data->hwcfg->oen_max_pin;
+ unsigned long flags;
+ u8 val, bit;
+
+ if (!rzg2l_oen_is_supported(caps, pin, max_pin))
+ return -EINVAL;
+
+ bit = rzg2l_pin_to_oen_bit(offset, pin, max_port);
+
+ spin_lock_irqsave(&pctrl->lock, flags);
+ val = readb(pctrl->base + ETH_MODE);
+ if (oen)
+ val &= ~BIT(bit);
+ else
+ val |= BIT(bit);
+ writeb(val, pctrl->base + ETH_MODE);
+ spin_unlock_irqrestore(&pctrl->lock, flags);
+
+ return 0;
+}
+
static int rzg2l_pinctrl_pinconf_get(struct pinctrl_dev *pctldev,
unsigned int _pin,
unsigned long *config)
@@ -819,6 +885,12 @@ static int rzg2l_pinctrl_pinconf_get(struct pinctrl_dev *pctldev,
return -EINVAL;
break;

+ case PIN_CONFIG_OUTPUT_ENABLE:
+ arg = rzg2l_read_oen(pctrl, cfg, _pin, bit);
+ if (!arg)
+ return -EINVAL;
+ break;
+
case PIN_CONFIG_POWER_SOURCE:
ret = rzg2l_get_power_source(pctrl, _pin, cfg);
if (ret < 0)
@@ -920,6 +992,13 @@ static int rzg2l_pinctrl_pinconf_set(struct pinctrl_dev *pctldev,
rzg2l_rmw_pin_config(pctrl, IEN(off), bit, IEN_MASK, !!arg);
break;

+ case PIN_CONFIG_OUTPUT_ENABLE:
+ arg = pinconf_to_config_argument(_configs[i]);
+ ret = rzg2l_write_oen(pctrl, cfg, _pin, bit, !!arg);
+ if (ret)
+ return ret;
+ break;
+
case PIN_CONFIG_POWER_SOURCE:
settings.power_source = pinconf_to_config_argument(_configs[i]);
break;
@@ -1364,7 +1443,8 @@ static const u32 r9a07g043_gpio_configs[] = {
static const u32 r9a08g045_gpio_configs[] = {
RZG2L_GPIO_PORT_PACK(4, 0x20, RZG3S_MPXED_PIN_FUNCS(A)), /* P0 */
RZG2L_GPIO_PORT_PACK(5, 0x30, RZG2L_MPXED_ETH_PIN_FUNCS(PIN_CFG_IOLH_C |
- PIN_CFG_IO_VMC_ETH0)), /* P1 */
+ PIN_CFG_IO_VMC_ETH0)) |
+ PIN_CFG_OEN, /* P1 */
RZG2L_GPIO_PORT_PACK(4, 0x31, RZG2L_MPXED_ETH_PIN_FUNCS(PIN_CFG_IOLH_C |
PIN_CFG_IO_VMC_ETH0)), /* P2 */
RZG2L_GPIO_PORT_PACK(4, 0x32, RZG2L_MPXED_ETH_PIN_FUNCS(PIN_CFG_IOLH_C |
@@ -1374,7 +1454,8 @@ static const u32 r9a08g045_gpio_configs[] = {
RZG2L_GPIO_PORT_PACK(5, 0x21, RZG3S_MPXED_PIN_FUNCS(A)), /* P5 */
RZG2L_GPIO_PORT_PACK(5, 0x22, RZG3S_MPXED_PIN_FUNCS(A)), /* P6 */
RZG2L_GPIO_PORT_PACK(5, 0x34, RZG2L_MPXED_ETH_PIN_FUNCS(PIN_CFG_IOLH_C |
- PIN_CFG_IO_VMC_ETH1)), /* P7 */
+ PIN_CFG_IO_VMC_ETH1)) |
+ PIN_CFG_OEN, /* P7 */
RZG2L_GPIO_PORT_PACK(5, 0x35, RZG2L_MPXED_ETH_PIN_FUNCS(PIN_CFG_IOLH_C |
PIN_CFG_IO_VMC_ETH1)), /* P8 */
RZG2L_GPIO_PORT_PACK(4, 0x36, RZG2L_MPXED_ETH_PIN_FUNCS(PIN_CFG_IOLH_C |
@@ -1956,6 +2037,8 @@ static const struct rzg2l_hwcfg rzg3s_hwcfg = {
},
.drive_strength_ua = true,
.func_base = 1,
+ .oen_max_pin = 1, /* Pin 1 of P0 and P7 is the maximum OEN pin. */
+ .oen_max_port = 7, /* P7_1 is the maximum OEN port. */
};

static struct rzg2l_pinctrl_data r9a07g043_data = {
--
2.39.2