[PATCH net-next v3 5/8] net: txgbe: Support GPIO to SFP socket

Jiawen Wu
2023-04-19T08:29:25Z

Register GPIO chip and handle GPIO IRQ for SFP socket.

Signed-off-by: Jiawen Wu <jiawenwu@trustnetic.com>
---
drivers/net/ethernet/wangxun/Kconfig | 2 +
drivers/net/ethernet/wangxun/libwx/wx_lib.c | 3 +-
drivers/net/ethernet/wangxun/libwx/wx_type.h | 2 +
.../net/ethernet/wangxun/txgbe/txgbe_main.c | 20 +-
.../net/ethernet/wangxun/txgbe/txgbe_phy.c | 228 ++++++++++++++++++
.../net/ethernet/wangxun/txgbe/txgbe_type.h | 27 +++
6 files changed, 263 insertions(+), 19 deletions(-)

diff --git a/drivers/net/ethernet/wangxun/Kconfig b/drivers/net/ethernet/wangxun/Kconfig
index d2dbaf19e53d..9b69c3d53d65 100644
--- a/drivers/net/ethernet/wangxun/Kconfig
+++ b/drivers/net/ethernet/wangxun/Kconfig
@@ -41,6 +41,8 @@ config TXGBE
tristate "Wangxun(R) 10GbE PCI Express adapters support"
depends on PCI
select I2C_DESIGNWARE_PLATFORM
+ select GPIOLIB_IRQCHIP
+ select GPIOLIB
select LIBWX
select SFP
help
diff --git a/drivers/net/ethernet/wangxun/libwx/wx_lib.c b/drivers/net/ethernet/wangxun/libwx/wx_lib.c
index eb89a274083e..dff0d573ee33 100644
--- a/drivers/net/ethernet/wangxun/libwx/wx_lib.c
+++ b/drivers/net/ethernet/wangxun/libwx/wx_lib.c
@@ -1348,7 +1348,8 @@ void wx_free_irq(struct wx *wx)
free_irq(entry->vector, q_vector);
}

- free_irq(wx->msix_entries[vector].vector, wx);
+ if (wx->mac.type == wx_mac_em)
+ free_irq(wx->msix_entries[vector].vector, wx);
}
EXPORT_SYMBOL(wx_free_irq);

diff --git a/drivers/net/ethernet/wangxun/libwx/wx_type.h b/drivers/net/ethernet/wangxun/libwx/wx_type.h
index 97bce855bc60..d151d6f79022 100644
--- a/drivers/net/ethernet/wangxun/libwx/wx_type.h
+++ b/drivers/net/ethernet/wangxun/libwx/wx_type.h
@@ -79,7 +79,9 @@
#define WX_GPIO_INTMASK 0x14834
#define WX_GPIO_INTTYPE_LEVEL 0x14838
#define WX_GPIO_POLARITY 0x1483C
+#define WX_GPIO_INTSTATUS 0x14844
#define WX_GPIO_EOI 0x1484C
+#define WX_GPIO_EXT 0x14850

/*********************** Transmit DMA registers **************************/
/* transmit global control */
diff --git a/drivers/net/ethernet/wangxun/txgbe/txgbe_main.c b/drivers/net/ethernet/wangxun/txgbe/txgbe_main.c
index dbd4d409d93b..b1ede19f4ff8 100644
--- a/drivers/net/ethernet/wangxun/txgbe/txgbe_main.c
+++ b/drivers/net/ethernet/wangxun/txgbe/txgbe_main.c
@@ -82,6 +82,8 @@ static int txgbe_enumerate_functions(struct wx *wx)
**/
static void txgbe_irq_enable(struct wx *wx, bool queues)
{
+ wr32(wx, WX_PX_MISC_IEN, TXGBE_PX_MISC_IEN_MASK);
+
/* unmask interrupt */
wx_intr_enable(wx, TXGBE_INTR_MISC(wx));
if (queues)
@@ -129,17 +131,6 @@ static irqreturn_t txgbe_intr(int __always_unused irq, void *data)
return IRQ_HANDLED;
}

-static irqreturn_t txgbe_msix_other(int __always_unused irq, void *data)
-{
- struct wx *wx = data;
-
- /* re-enable the original interrupt state */
- if (netif_running(wx->netdev))
- txgbe_irq_enable(wx, false);
-
- return IRQ_HANDLED;
-}
-
/**
* txgbe_request_msix_irqs - Initialize MSI-X interrupts
* @wx: board private structure
@@ -171,13 +162,6 @@ static int txgbe_request_msix_irqs(struct wx *wx)
}
}

- err = request_irq(wx->msix_entries[vector].vector,
- txgbe_msix_other, 0, netdev->name, wx);
- if (err) {
- wx_err(wx, "request_irq for msix_other failed: %d\n", err);
- goto free_queue_irqs;
- }
-
return 0;

free_queue_irqs:
diff --git a/drivers/net/ethernet/wangxun/txgbe/txgbe_phy.c b/drivers/net/ethernet/wangxun/txgbe/txgbe_phy.c
index faa0479f1df3..d98d283dd0db 100644
--- a/drivers/net/ethernet/wangxun/txgbe/txgbe_phy.c
+++ b/drivers/net/ethernet/wangxun/txgbe/txgbe_phy.c
@@ -3,11 +3,15 @@

#include <linux/platform_data/i2c-dw.h>
#include <linux/platform_device.h>
+#include <linux/gpio/consumer.h>
+#include <linux/gpio/machine.h>
+#include <linux/gpio/driver.h>
#include <linux/gpio/property.h>
#include <linux/i2c.h>
#include <linux/pci.h>

#include "../libwx/wx_type.h"
+#include "../libwx/wx_hw.h"
#include "txgbe_type.h"
#include "txgbe_phy.h"

@@ -105,6 +109,224 @@ static int txgbe_i2c_register(struct txgbe *txgbe)
return 0;
}

+static int txgbe_gpio_get(struct gpio_chip *chip, unsigned int offset)
+{
+ struct wx *wx = gpiochip_get_data(chip);
+ struct txgbe *txgbe = wx->priv;
+ int val;
+
+ val = rd32m(wx, WX_GPIO_EXT, BIT(offset));
+
+ txgbe->gpio_orig &= ~BIT(offset);
+ txgbe->gpio_orig |= val;
+
+ return !!(val & BIT(offset));
+}
+
+static int txgbe_gpio_get_direction(struct gpio_chip *chip, unsigned int offset)
+{
+ struct wx *wx = gpiochip_get_data(chip);
+ u32 val;
+
+ val = rd32(wx, WX_GPIO_DDR);
+ if (BIT(offset) & val)
+ return GPIO_LINE_DIRECTION_OUT;
+
+ return GPIO_LINE_DIRECTION_IN;
+}
+
+static int txgbe_gpio_direction_in(struct gpio_chip *chip, unsigned int offset)
+{
+ struct wx *wx = gpiochip_get_data(chip);
+
+ wr32m(wx, WX_GPIO_DDR, BIT(offset), 0);
+
+ return 0;
+}
+
+static int txgbe_gpio_direction_out(struct gpio_chip *chip, unsigned int offset,
+ int val)
+{
+ struct wx *wx = gpiochip_get_data(chip);
+ u32 mask;
+
+ mask = BIT(offset) | BIT(offset - 1);
+ if (val)
+ wr32m(wx, WX_GPIO_DR, mask, mask);
+ else
+ wr32m(wx, WX_GPIO_DR, mask, 0);
+
+ wr32m(wx, WX_GPIO_DDR, BIT(offset), BIT(offset));
+
+ return 0;
+}
+
+static void txgbe_gpio_irq_ack(struct irq_data *d)
+{
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+ irq_hw_number_t hwirq = irqd_to_hwirq(d);
+ struct wx *wx = gpiochip_get_data(gc);
+
+ wr32(wx, WX_GPIO_EOI, BIT(hwirq));
+}
+
+static void txgbe_gpio_irq_mask(struct irq_data *d)
+{
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+ irq_hw_number_t hwirq = irqd_to_hwirq(d);
+ struct wx *wx = gpiochip_get_data(gc);
+
+ gpiochip_disable_irq(gc, hwirq);
+
+ wr32m(wx, WX_GPIO_INTMASK, BIT(hwirq), BIT(hwirq));
+}
+
+static void txgbe_gpio_irq_unmask(struct irq_data *d)
+{
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+ irq_hw_number_t hwirq = irqd_to_hwirq(d);
+ struct wx *wx = gpiochip_get_data(gc);
+
+ gpiochip_enable_irq(gc, hwirq);
+
+ wr32m(wx, WX_GPIO_INTMASK, BIT(hwirq), 0);
+}
+
+static int txgbe_gpio_set_type(struct irq_data *d, unsigned int type)
+{
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+ irq_hw_number_t hwirq = irqd_to_hwirq(d);
+ struct wx *wx = gpiochip_get_data(gc);
+ u32 level, polarity;
+
+ level = rd32(wx, WX_GPIO_INTTYPE_LEVEL);
+ polarity = rd32(wx, WX_GPIO_POLARITY);
+
+ switch (type) {
+ case IRQ_TYPE_EDGE_BOTH:
+ level |= BIT(hwirq);
+ break;
+ case IRQ_TYPE_EDGE_RISING:
+ level |= BIT(hwirq);
+ polarity |= BIT(hwirq);
+ break;
+ case IRQ_TYPE_EDGE_FALLING:
+ level |= BIT(hwirq);
+ polarity &= ~BIT(hwirq);
+ break;
+ case IRQ_TYPE_LEVEL_HIGH:
+ level &= ~BIT(hwirq);
+ polarity |= BIT(hwirq);
+ break;
+ case IRQ_TYPE_LEVEL_LOW:
+ level &= ~BIT(hwirq);
+ polarity &= ~BIT(hwirq);
+ break;
+ }
+
+ if (type & IRQ_TYPE_LEVEL_MASK)
+ irq_set_handler_locked(d, handle_level_irq);
+ else if (type & IRQ_TYPE_EDGE_BOTH)
+ irq_set_handler_locked(d, handle_edge_irq);
+
+ wr32m(wx, WX_GPIO_INTEN, BIT(hwirq), BIT(hwirq));
+ wr32(wx, WX_GPIO_INTTYPE_LEVEL, level);
+ if (type != IRQ_TYPE_EDGE_BOTH)
+ wr32(wx, WX_GPIO_POLARITY, polarity);
+
+ return 0;
+}
+
+static const struct irq_chip txgbe_gpio_irq_chip = {
+ .name = "txgbe_gpio_irq",
+ .irq_ack = txgbe_gpio_irq_ack,
+ .irq_mask = txgbe_gpio_irq_mask,
+ .irq_unmask = txgbe_gpio_irq_unmask,
+ .irq_set_type = txgbe_gpio_set_type,
+ .flags = IRQCHIP_IMMUTABLE,
+ GPIOCHIP_IRQ_RESOURCE_HELPERS,
+};
+
+static void txgbe_irq_handler(struct irq_desc *desc)
+{
+ struct irq_chip *chip = irq_desc_get_chip(desc);
+ struct wx *wx = irq_desc_get_handler_data(desc);
+ struct txgbe *txgbe = wx->priv;
+ irq_hw_number_t hwirq;
+ unsigned long gpioirq;
+ struct gpio_chip *gc;
+ u32 gpio;
+
+ chained_irq_enter(chip, desc);
+
+ gpioirq = rd32(wx, WX_GPIO_INTSTATUS);
+
+ /* workaround for hysteretic gpio interrupts */
+ gpio = rd32(wx, WX_GPIO_EXT);
+ if (!gpioirq)
+ gpioirq = txgbe->gpio_orig ^ gpio;
+
+ gc = txgbe->gpio;
+ for_each_set_bit(hwirq, &gpioirq, gc->ngpio)
+ generic_handle_domain_irq(gc->irq.domain, hwirq);
+
+ chained_irq_exit(chip, desc);
+
+ /* unmask interrupt */
+ if (netif_running(wx->netdev))
+ wx_intr_enable(wx, TXGBE_INTR_MISC(wx));
+}
+
+static int txgbe_gpio_init(struct txgbe *txgbe)
+{
+ struct gpio_irq_chip *girq;
+ struct wx *wx = txgbe->wx;
+ struct pci_dev *pdev;
+ struct gpio_chip *gc;
+ int ret;
+
+ pdev = wx->pdev;
+ txgbe->gpio_orig = 0;
+
+ gc = devm_kzalloc(&pdev->dev, sizeof(*gc), GFP_KERNEL);
+ if (!gc)
+ return -ENOMEM;
+
+ gc->label = devm_kasprintf(&pdev->dev, GFP_KERNEL, "txgbe_gpio-%x",
+ (pdev->bus->number << 8) | pdev->devfn);
+ gc->base = -1;
+ gc->ngpio = 6;
+ gc->owner = THIS_MODULE;
+ gc->parent = &pdev->dev;
+ gc->fwnode = software_node_fwnode(txgbe->nodes.group[SWNODE_GPIO]);
+ gc->get = txgbe_gpio_get;
+ gc->get_direction = txgbe_gpio_get_direction;
+ gc->direction_input = txgbe_gpio_direction_in;
+ gc->direction_output = txgbe_gpio_direction_out;
+ gc->can_sleep = false;
+
+ girq = &gc->irq;
+ gpio_irq_chip_set_chip(girq, &txgbe_gpio_irq_chip);
+ girq->parent_handler = txgbe_irq_handler;
+ girq->parent_handler_data = wx;
+ girq->num_parents = 1;
+ girq->parents = devm_kcalloc(&pdev->dev, 1, sizeof(*girq->parents),
+ GFP_KERNEL);
+ if (!girq->parents)
+ return -ENOMEM;
+ girq->parents[0] = wx->msix_entries[wx->num_q_vectors].vector;
+ girq->default_type = IRQ_TYPE_NONE;
+ girq->handler = handle_bad_irq;
+
+ ret = devm_gpiochip_add_data(&pdev->dev, gc, wx);
+ if (ret)
+ return ret;
+
+ txgbe->gpio = gc;
+
+ return 0;
+}
+
static int txgbe_sfp_register(struct txgbe *txgbe)
{
struct pci_dev *pdev = txgbe->wx->pdev;
@@ -140,6 +362,12 @@ int txgbe_init_phy(struct txgbe *txgbe)
goto err;
}

+ ret = txgbe_gpio_init(txgbe);
+ if (ret) {
+ wx_err(txgbe->wx, "failed to init gpio\n");
+ goto err;
+ }
+
ret = txgbe_sfp_register(txgbe);
if (ret) {
wx_err(txgbe->wx, "failed to register sfp\n");
diff --git a/drivers/net/ethernet/wangxun/txgbe/txgbe_type.h b/drivers/net/ethernet/wangxun/txgbe/txgbe_type.h
index aa94c4fce311..334803e6a5de 100644
--- a/drivers/net/ethernet/wangxun/txgbe/txgbe_type.h
+++ b/drivers/net/ethernet/wangxun/txgbe/txgbe_type.h
@@ -55,6 +55,31 @@
#define TXGBE_TS_CTL 0x10300
#define TXGBE_TS_CTL_EVAL_MD BIT(31)

+/* GPIO register bit */
+#define TXGBE_GPIOBIT_0 BIT(0) /* I:tx fault */
+#define TXGBE_GPIOBIT_1 BIT(1) /* O:tx disabled */
+#define TXGBE_GPIOBIT_2 BIT(2) /* I:sfp module absent */
+#define TXGBE_GPIOBIT_3 BIT(3) /* I:rx signal lost */
+#define TXGBE_GPIOBIT_4 BIT(4) /* O:rate select, 1G(0) 10G(1) */
+#define TXGBE_GPIOBIT_5 BIT(5) /* O:rate select, 1G(0) 10G(1) */
+
+/* Extended Interrupt Enable Set */
+#define TXGBE_PX_MISC_ETH_LKDN BIT(8)
+#define TXGBE_PX_MISC_DEV_RST BIT(10)
+#define TXGBE_PX_MISC_ETH_EVENT BIT(17)
+#define TXGBE_PX_MISC_ETH_LK BIT(18)
+#define TXGBE_PX_MISC_ETH_AN BIT(19)
+#define TXGBE_PX_MISC_INT_ERR BIT(20)
+#define TXGBE_PX_MISC_GPIO BIT(26)
+#define TXGBE_PX_MISC_IEN_MASK ( \
+ TXGBE_PX_MISC_ETH_LKDN | \
+ TXGBE_PX_MISC_DEV_RST | \
+ TXGBE_PX_MISC_ETH_EVENT | \
+ TXGBE_PX_MISC_ETH_LK | \
+ TXGBE_PX_MISC_ETH_AN | \
+ TXGBE_PX_MISC_INT_ERR | \
+ TXGBE_PX_MISC_GPIO)
+
/* I2C registers */
#define TXGBE_I2C_BASE 0x14900

@@ -151,6 +176,8 @@ struct txgbe {
struct txgbe_nodes nodes;
struct platform_device *sfp_dev;
struct platform_device *i2c_dev;
+ struct gpio_chip *gpio;
+ u32 gpio_orig;
};

#endif /* _TXGBE_TYPE_H_ */
--
2.27.0