Revert "gpio: thunderx: Switch to GPIOLIB_IRQCHIP"

This reverts commit a7fc89f9d5fcc10a5474cfe555f5a9e5df8b0f1f because
there are some bugs in this commit, and we don't have a simple way to
fix these bugs. So revert this commit to make the thunderx gpio work
on the stable kernel at least. We will switch to GPIOLIB_IRQCHIP
for thunderx gpio by following patches.

Fixes: a7fc89f9d5fc ("gpio: thunderx: Switch to GPIOLIB_IRQCHIP")
Signed-off-by: Kevin Hao <haokexin@gmail.com>
Link: https://lore.kernel.org/r/20200114082821.14015-2-haokexin@gmail.com
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 2ed5992..4b6d2ef 100644 (file)
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -573,7 +573,6 @@ config GPIO_THUNDERX
        tristate "Cavium ThunderX/OCTEON-TX GPIO"
        depends on ARCH_THUNDER || (64BIT && COMPILE_TEST)
        depends on PCI_MSI
-       select GPIOLIB_IRQCHIP
        select IRQ_DOMAIN_HIERARCHY
        select IRQ_FASTEOI_HIERARCHY_HANDLERS
        help

diff --git a/drivers/gpio/gpio-thunderx.c b/drivers/gpio/gpio-thunderx.c
index d08d86a..4627704 100644 (file)
--- a/drivers/gpio/gpio-thunderx.c
+++ b/drivers/gpio/gpio-thunderx.c
@@ -53,6 +53,7 @@ struct thunderx_line {
 struct thunderx_gpio {
        struct gpio_chip        chip;
        u8 __iomem              *register_base;
+       struct irq_domain       *irqd;
        struct msix_entry       *msix_entries;  /* per line MSI-X */
        struct thunderx_line    *line_entries;  /* per line irq info */
        raw_spinlock_t          lock;
@@ -285,60 +286,54 @@ static void thunderx_gpio_set_multiple(struct gpio_chip *chip,
        }
 }
 
-static void thunderx_gpio_irq_ack(struct irq_data *d)
+static void thunderx_gpio_irq_ack(struct irq_data *data)
 {
-       struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
-       struct thunderx_gpio *txgpio = gpiochip_get_data(gc);
+       struct thunderx_line *txline = irq_data_get_irq_chip_data(data);
 
        writeq(GPIO_INTR_INTR,
-              txgpio->register_base + intr_reg(irqd_to_hwirq(d)));
+              txline->txgpio->register_base + intr_reg(txline->line));
 }
 
-static void thunderx_gpio_irq_mask(struct irq_data *d)
+static void thunderx_gpio_irq_mask(struct irq_data *data)
 {
-       struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
-       struct thunderx_gpio *txgpio = gpiochip_get_data(gc);
+       struct thunderx_line *txline = irq_data_get_irq_chip_data(data);
 
        writeq(GPIO_INTR_ENA_W1C,
-              txgpio->register_base + intr_reg(irqd_to_hwirq(d)));
+              txline->txgpio->register_base + intr_reg(txline->line));
 }
 
-static void thunderx_gpio_irq_mask_ack(struct irq_data *d)
+static void thunderx_gpio_irq_mask_ack(struct irq_data *data)
 {
-       struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
-       struct thunderx_gpio *txgpio = gpiochip_get_data(gc);
+       struct thunderx_line *txline = irq_data_get_irq_chip_data(data);
 
        writeq(GPIO_INTR_ENA_W1C | GPIO_INTR_INTR,
-              txgpio->register_base + intr_reg(irqd_to_hwirq(d)));
+              txline->txgpio->register_base + intr_reg(txline->line));
 }
 
-static void thunderx_gpio_irq_unmask(struct irq_data *d)
+static void thunderx_gpio_irq_unmask(struct irq_data *data)
 {
-       struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
-       struct thunderx_gpio *txgpio = gpiochip_get_data(gc);
+       struct thunderx_line *txline = irq_data_get_irq_chip_data(data);
 
        writeq(GPIO_INTR_ENA_W1S,
-              txgpio->register_base + intr_reg(irqd_to_hwirq(d)));
+              txline->txgpio->register_base + intr_reg(txline->line));
 }
 
-static int thunderx_gpio_irq_set_type(struct irq_data *d,
+static int thunderx_gpio_irq_set_type(struct irq_data *data,
                                      unsigned int flow_type)
 {
-       struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
-       struct thunderx_gpio *txgpio = gpiochip_get_data(gc);
-       struct thunderx_line *txline =
-               &txgpio->line_entries[irqd_to_hwirq(d)];
+       struct thunderx_line *txline = irq_data_get_irq_chip_data(data);
+       struct thunderx_gpio *txgpio = txline->txgpio;
        u64 bit_cfg;
 
-       irqd_set_trigger_type(d, flow_type);
+       irqd_set_trigger_type(data, flow_type);
 
        bit_cfg = txline->fil_bits | GPIO_BIT_CFG_INT_EN;
 
        if (flow_type & IRQ_TYPE_EDGE_BOTH) {
-               irq_set_handler_locked(d, handle_fasteoi_ack_irq);
+               irq_set_handler_locked(data, handle_fasteoi_ack_irq);
                bit_cfg |= GPIO_BIT_CFG_INT_TYPE;
        } else {
-               irq_set_handler_locked(d, handle_fasteoi_mask_irq);
+               irq_set_handler_locked(data, handle_fasteoi_mask_irq);
        }
 
        raw_spin_lock(&txgpio->lock);
@@ -367,6 +362,33 @@ static void thunderx_gpio_irq_disable(struct irq_data *data)
        irq_chip_disable_parent(data);
 }
 
+static int thunderx_gpio_irq_request_resources(struct irq_data *data)
+{
+       struct thunderx_line *txline = irq_data_get_irq_chip_data(data);
+       struct thunderx_gpio *txgpio = txline->txgpio;
+       int r;
+
+       r = gpiochip_lock_as_irq(&txgpio->chip, txline->line);
+       if (r)
+               return r;
+
+       r = irq_chip_request_resources_parent(data);
+       if (r)
+               gpiochip_unlock_as_irq(&txgpio->chip, txline->line);
+
+       return r;
+}
+
+static void thunderx_gpio_irq_release_resources(struct irq_data *data)
+{
+       struct thunderx_line *txline = irq_data_get_irq_chip_data(data);
+       struct thunderx_gpio *txgpio = txline->txgpio;
+
+       irq_chip_release_resources_parent(data);
+
+       gpiochip_unlock_as_irq(&txgpio->chip, txline->line);
+}
+
 /*
  * Interrupts are chained from underlying MSI-X vectors.  We have
  * these irq_chip functions to be able to handle level triggering
@@ -383,24 +405,50 @@ static struct irq_chip thunderx_gpio_irq_chip = {
        .irq_unmask             = thunderx_gpio_irq_unmask,
        .irq_eoi                = irq_chip_eoi_parent,
        .irq_set_affinity       = irq_chip_set_affinity_parent,
+       .irq_request_resources  = thunderx_gpio_irq_request_resources,
+       .irq_release_resources  = thunderx_gpio_irq_release_resources,
        .irq_set_type           = thunderx_gpio_irq_set_type,
 
        .flags                  = IRQCHIP_SET_TYPE_MASKED
 };
 
-static int thunderx_gpio_child_to_parent_hwirq(struct gpio_chip *gc,
-                                              unsigned int child,
-                                              unsigned int child_type,
-                                              unsigned int *parent,
-                                              unsigned int *parent_type)
+static int thunderx_gpio_irq_translate(struct irq_domain *d,
+                                      struct irq_fwspec *fwspec,
+                                      irq_hw_number_t *hwirq,
+                                      unsigned int *type)
 {
-       struct thunderx_gpio *txgpio = gpiochip_get_data(gc);
-
-       *parent = txgpio->base_msi + (2 * child);
-       *parent_type = IRQ_TYPE_LEVEL_HIGH;
+       struct thunderx_gpio *txgpio = d->host_data;
+
+       if (WARN_ON(fwspec->param_count < 2))
+               return -EINVAL;
+       if (fwspec->param[0] >= txgpio->chip.ngpio)
+               return -EINVAL;
+       *hwirq = fwspec->param[0];
+       *type = fwspec->param[1] & IRQ_TYPE_SENSE_MASK;
        return 0;
 }
 
+static int thunderx_gpio_irq_alloc(struct irq_domain *d, unsigned int virq,
+                                  unsigned int nr_irqs, void *arg)
+{
+       struct thunderx_line *txline = arg;
+
+       return irq_domain_set_hwirq_and_chip(d, virq, txline->line,
+                                            &thunderx_gpio_irq_chip, txline);
+}
+
+static const struct irq_domain_ops thunderx_gpio_irqd_ops = {
+       .alloc          = thunderx_gpio_irq_alloc,
+       .translate      = thunderx_gpio_irq_translate
+};
+
+static int thunderx_gpio_to_irq(struct gpio_chip *chip, unsigned int offset)
+{
+       struct thunderx_gpio *txgpio = gpiochip_get_data(chip);
+
+       return irq_find_mapping(txgpio->irqd, offset);
+}
+
 static int thunderx_gpio_probe(struct pci_dev *pdev,
                               const struct pci_device_id *id)
 {
@@ -408,7 +456,6 @@ static int thunderx_gpio_probe(struct pci_dev *pdev,
        struct device *dev = &pdev->dev;
        struct thunderx_gpio *txgpio;
        struct gpio_chip *chip;
-       struct gpio_irq_chip *girq;
        int ngpio, i;
        int err = 0;
 
@@ -453,8 +500,8 @@ static int thunderx_gpio_probe(struct pci_dev *pdev,
        }
 
        txgpio->msix_entries = devm_kcalloc(dev,
-                                           ngpio, sizeof(struct msix_entry),
-                                           GFP_KERNEL);
+                                         ngpio, sizeof(struct msix_entry),
+                                         GFP_KERNEL);
        if (!txgpio->msix_entries) {
                err = -ENOMEM;
                goto out;
@@ -495,6 +542,27 @@ static int thunderx_gpio_probe(struct pci_dev *pdev,
        if (err < 0)
                goto out;
 
+       /*
+        * Push GPIO specific irqdomain on hierarchy created as a side
+        * effect of the pci_enable_msix()
+        */
+       txgpio->irqd = irq_domain_create_hierarchy(irq_get_irq_data(txgpio->msix_entries[0].vector)->domain,
+                                                  0, 0, of_node_to_fwnode(dev->of_node),
+                                                  &thunderx_gpio_irqd_ops, txgpio);
+       if (!txgpio->irqd) {
+               err = -ENOMEM;
+               goto out;
+       }
+
+       /* Push on irq_data and the domain for each line. */
+       for (i = 0; i < ngpio; i++) {
+               err = irq_domain_push_irq(txgpio->irqd,
+                                         txgpio->msix_entries[i].vector,
+                                         &txgpio->line_entries[i]);
+               if (err < 0)
+                       dev_err(dev, "irq_domain_push_irq: %d\n", err);
+       }
+
        chip->label = KBUILD_MODNAME;
        chip->parent = dev;
        chip->owner = THIS_MODULE;
@@ -509,28 +577,11 @@ static int thunderx_gpio_probe(struct pci_dev *pdev,
        chip->set = thunderx_gpio_set;
        chip->set_multiple = thunderx_gpio_set_multiple;
        chip->set_config = thunderx_gpio_set_config;
-       girq = &chip->irq;
-       girq->chip = &thunderx_gpio_irq_chip;
-       girq->fwnode = of_node_to_fwnode(dev->of_node);
-       girq->parent_domain =
-               irq_get_irq_data(txgpio->msix_entries[0].vector)->domain;
-       girq->child_to_parent_hwirq = thunderx_gpio_child_to_parent_hwirq;
-       girq->handler = handle_bad_irq;
-       girq->default_type = IRQ_TYPE_NONE;
-
+       chip->to_irq = thunderx_gpio_to_irq;
        err = devm_gpiochip_add_data(dev, chip, txgpio);
        if (err)
                goto out;
 
-       /* Push on irq_data and the domain for each line. */
-       for (i = 0; i < ngpio; i++) {
-               err = irq_domain_push_irq(chip->irq.domain,
-                                         txgpio->msix_entries[i].vector,
-                                         chip);
-               if (err < 0)
-                       dev_err(dev, "irq_domain_push_irq: %d\n", err);
-       }
-
        dev_info(dev, "ThunderX GPIO: %d lines with base %d.\n",
                 ngpio, chip->base);
        return 0;
@@ -545,10 +596,10 @@ static void thunderx_gpio_remove(struct pci_dev *pdev)
        struct thunderx_gpio *txgpio = pci_get_drvdata(pdev);
 
        for (i = 0; i < txgpio->chip.ngpio; i++)
-               irq_domain_pop_irq(txgpio->chip.irq.domain,
+               irq_domain_pop_irq(txgpio->irqd,
                                   txgpio->msix_entries[i].vector);
 
-       irq_domain_remove(txgpio->chip.irq.domain);
+       irq_domain_remove(txgpio->irqd);
 
        pci_set_drvdata(pdev, NULL);
 }