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Message-Id: <20190222221850.26939-5-ilina@codeaurora.org>
Date: Fri, 22 Feb 2019 15:18:45 -0700
From: Lina Iyer <ilina@...eaurora.org>
To: swboyd@...omium.org, evgreen@...omium.org, marc.zyngier@....com
Cc: linux-kernel@...r.kernel.org, rplsssn@...eaurora.org,
linux-arm-msm@...r.kernel.org, thierry.reding@...il.com,
bjorn.andersson@...aro.org, dianders@...omium.org,
linus.walleij@...aro.org, Lina Iyer <ilina@...eaurora.org>
Subject: [PATCH v3 4/9] drivers: irqchip: add PDC irqdomain for wakeup capable GPIOs
Introduce a new domain for wakeup capable GPIOs. The domain can be
requested using the bus token DOMAIN_BUS_WAKEUP. In the following
patches, we will specify PDC as the wakeup-parent for the TLMM GPIO
irqchip. Requesting a wakeup GPIO will setup the GPIO and the
corresponding PDC interrupt as its parent.
Co-developed-by: Stephen Boyd <swboyd@...omium.org>
Signed-off-by: Lina Iyer <ilina@...eaurora.org>
---
Changes in v3:
- Remove PDC GPIO map data (moved to DT)
- hwirq passed in .alloc() is a PDC pin now
Changes in v2:
- Remove separate file for PDC GPIO map data
- Error checks and return
- Whitespace fixes
---
drivers/irqchip/qcom-pdc.c | 106 ++++++++++++++++++++++++++++++++---
include/linux/soc/qcom/irq.h | 23 ++++++++
2 files changed, 120 insertions(+), 9 deletions(-)
create mode 100644 include/linux/soc/qcom/irq.h
diff --git a/drivers/irqchip/qcom-pdc.c b/drivers/irqchip/qcom-pdc.c
index faa7d61b9d6c..5a64cbeec410 100644
--- a/drivers/irqchip/qcom-pdc.c
+++ b/drivers/irqchip/qcom-pdc.c
@@ -13,12 +13,13 @@
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_device.h>
+#include <linux/soc/qcom/irq.h>
#include <linux/spinlock.h>
-#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/types.h>
#define PDC_MAX_IRQS 126
+#define PDC_MAX_GPIO_IRQS 256
#define CLEAR_INTR(reg, intr) (reg & ~(1 << intr))
#define ENABLE_INTR(reg, intr) (reg | (1 << intr))
@@ -32,6 +33,16 @@ struct pdc_pin_region {
u32 cnt;
};
+struct pdc_gpio_pin_map {
+ unsigned int gpio;
+ u32 pdc_pin;
+};
+
+struct pdc_gpio_pin_data {
+ size_t size;
+ const struct pdc_gpio_pin_map *map;
+};
+
static DEFINE_RAW_SPINLOCK(pdc_lock);
static void __iomem *pdc_base;
static struct pdc_pin_region *pdc_region;
@@ -47,9 +58,8 @@ static u32 pdc_reg_read(int reg, u32 i)
return readl_relaxed(pdc_base + reg + i * sizeof(u32));
}
-static void pdc_enable_intr(struct irq_data *d, bool on)
+static void pdc_enable_intr(irq_hw_number_t pin_out, bool on)
{
- int pin_out = d->hwirq;
u32 index, mask;
u32 enable;
@@ -65,13 +75,23 @@ static void pdc_enable_intr(struct irq_data *d, bool on)
static void qcom_pdc_gic_mask(struct irq_data *d)
{
- pdc_enable_intr(d, false);
+ irq_hw_number_t hwirq = d->hwirq;
+
+ if (hwirq == ULONG_MAX)
+ return;
+
+ pdc_enable_intr(hwirq, false);
irq_chip_mask_parent(d);
}
static void qcom_pdc_gic_unmask(struct irq_data *d)
{
- pdc_enable_intr(d, true);
+ irq_hw_number_t hwirq = d->hwirq;
+
+ if (hwirq == ULONG_MAX)
+ return;
+
+ pdc_enable_intr(hwirq, true);
irq_chip_unmask_parent(d);
}
@@ -111,9 +131,12 @@ enum pdc_irq_config_bits {
*/
static int qcom_pdc_gic_set_type(struct irq_data *d, unsigned int type)
{
- int pin_out = d->hwirq;
+ irq_hw_number_t pin_out = d->hwirq;
enum pdc_irq_config_bits pdc_type;
+ if (pin_out == ULONG_MAX)
+ return 0;
+
switch (type) {
case IRQ_TYPE_EDGE_RISING:
pdc_type = PDC_EDGE_RISING;
@@ -157,7 +180,7 @@ static struct irq_chip qcom_pdc_gic_chip = {
.irq_set_affinity = irq_chip_set_affinity_parent,
};
-static irq_hw_number_t get_parent_hwirq(int pin)
+static irq_hw_number_t get_parent_hwirq(irq_hw_number_t pin)
{
int i;
struct pdc_pin_region *region;
@@ -169,7 +192,6 @@ static irq_hw_number_t get_parent_hwirq(int pin)
return (region->parent_base + pin - region->pin_base);
}
- WARN_ON(1);
return ~0UL;
}
@@ -232,6 +254,60 @@ static const struct irq_domain_ops qcom_pdc_ops = {
.free = irq_domain_free_irqs_common,
};
+static int qcom_pdc_gpio_alloc(struct irq_domain *domain, unsigned int virq,
+ unsigned int nr_irqs, void *data)
+{
+ struct qcom_irq_fwspec *qcom_fwspec = data;
+ struct irq_fwspec *fwspec = &qcom_fwspec->fwspec;
+ struct irq_fwspec parent_fwspec;
+ irq_hw_number_t hwirq, parent_hwirq;
+ unsigned int type;
+ int ret;
+
+ ret = qcom_pdc_translate(domain, fwspec, &hwirq, &type);
+ if (ret)
+ return -EINVAL;
+
+ parent_hwirq = get_parent_hwirq(hwirq);
+ if (parent_hwirq == ~0UL)
+ return -EINVAL;
+
+ ret = irq_domain_set_hwirq_and_chip(domain, virq, hwirq,
+ &qcom_pdc_gic_chip, NULL);
+ if (ret)
+ return ret;
+
+ qcom_fwspec->mask = true;
+
+ if (type & IRQ_TYPE_EDGE_BOTH)
+ type = IRQ_TYPE_EDGE_RISING;
+
+ if (type & IRQ_TYPE_LEVEL_MASK)
+ type = IRQ_TYPE_LEVEL_HIGH;
+
+ parent_fwspec.fwnode = domain->parent->fwnode;
+ parent_fwspec.param_count = 3;
+ parent_fwspec.param[0] = 0;
+ parent_fwspec.param[1] = parent_hwirq;
+ parent_fwspec.param[2] = type;
+
+ return irq_domain_alloc_irqs_parent(domain, virq, nr_irqs,
+ &parent_fwspec);
+}
+
+static int qcom_pdc_gpio_domain_select(struct irq_domain *d,
+ struct irq_fwspec *fwspec,
+ enum irq_domain_bus_token bus_token)
+{
+ return (bus_token == DOMAIN_BUS_WAKEUP);
+}
+
+static const struct irq_domain_ops qcom_pdc_gpio_ops = {
+ .select = qcom_pdc_gpio_domain_select,
+ .alloc = qcom_pdc_gpio_alloc,
+ .free = irq_domain_free_irqs_common,
+};
+
static int pdc_setup_pin_mapping(struct device_node *np)
{
int ret, n;
@@ -270,7 +346,7 @@ static int pdc_setup_pin_mapping(struct device_node *np)
static int qcom_pdc_init(struct device_node *node, struct device_node *parent)
{
- struct irq_domain *parent_domain, *pdc_domain;
+ struct irq_domain *parent_domain, *pdc_domain, *pdc_gpio_domain;
int ret;
pdc_base = of_iomap(node, 0);
@@ -301,6 +377,18 @@ static int qcom_pdc_init(struct device_node *node, struct device_node *parent)
goto fail;
}
+ pdc_gpio_domain = irq_domain_create_hierarchy(parent_domain, 0,
+ PDC_MAX_GPIO_IRQS,
+ of_fwnode_handle(node),
+ &qcom_pdc_gpio_ops, NULL);
+ if (!pdc_gpio_domain) {
+ pr_err("%pOF: GIC domain add failed for GPIO domain\n", node);
+ ret = -ENOMEM;
+ goto fail;
+ }
+
+ irq_domain_update_bus_token(pdc_gpio_domain, DOMAIN_BUS_WAKEUP);
+
return 0;
fail:
diff --git a/include/linux/soc/qcom/irq.h b/include/linux/soc/qcom/irq.h
new file mode 100644
index 000000000000..bacc9edbce0d
--- /dev/null
+++ b/include/linux/soc/qcom/irq.h
@@ -0,0 +1,23 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#ifndef __QCOM_IRQ_H
+#define __QCOM_IRQ_H
+
+#include <linux/irqdomain.h>
+
+/**
+ * struct qcom_irq_fwspec - qcom specific irq fwspec wrapper
+ * @fwspec: irq fwspec
+ * @mask: if true, keep the irq masked in the gpio controller
+ *
+ * Use this structure to communicate between the parent irq chip, MPM or PDC,
+ * to the gpio chip, TLMM, about the gpio being allocated in the parent
+ * and if the gpio chip should keep the line masked because the parent irq
+ * chip is handling everything about the irq line.
+ */
+struct qcom_irq_fwspec {
+ struct irq_fwspec fwspec;
+ bool mask;
+};
+
+#endif
--
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