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path: root/drivers/irqchip/irq-sun6i-r.c
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Diffstat (limited to 'drivers/irqchip/irq-sun6i-r.c')
-rw-r--r--drivers/irqchip/irq-sun6i-r.c379
1 files changed, 379 insertions, 0 deletions
diff --git a/drivers/irqchip/irq-sun6i-r.c b/drivers/irqchip/irq-sun6i-r.c
new file mode 100644
index 000000000000..4cd3e533740b
--- /dev/null
+++ b/drivers/irqchip/irq-sun6i-r.c
@@ -0,0 +1,379 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * The R_INTC in Allwinner A31 and newer SoCs manages several types of
+ * interrupts, as shown below:
+ *
+ * NMI IRQ DIRECT IRQs MUXED IRQs
+ * bit 0 bits 1-15^ bits 19-31
+ *
+ * +---------+ +---------+ +---------+ +---------+
+ * | NMI Pad | | IRQ d | | IRQ m | | IRQ m+7 |
+ * +---------+ +---------+ +---------+ +---------+
+ * | | | | | | |
+ * | | | | |......| |
+ * +------V------+ +------------+ | | | +--V------V--+ |
+ * | Invert/ | | Write 1 to | | | | | AND with | |
+ * | Edge Detect | | PENDING[0] | | | | | MUX[m/8] | |
+ * +-------------+ +------------+ | | | +------------+ |
+ * | | | | | | |
+ * +--V-------V--+ +--V--+ | +--V--+ | +--V--+
+ * | Set Reset| | GIC | | | GIC | | | GIC |
+ * | Latch | | SPI | | | SPI |... | ...| SPI |
+ * +-------------+ | N+d | | | m | | | m+7 |
+ * | | +-----+ | +-----+ | +-----+
+ * | | | |
+ * +-------V-+ +-V----------+ +---------V--+ +--------V--------+
+ * | GIC SPI | | AND with | | AND with | | AND with |
+ * | N (=32) | | ENABLE[0] | | ENABLE[d] | | ENABLE[19+m/8] |
+ * +---------+ +------------+ +------------+ +-----------------+
+ * | | |
+ * +------V-----+ +------V-----+ +--------V--------+
+ * | Read | | Read | | Read |
+ * | PENDING[0] | | PENDING[d] | | PENDING[19+m/8] |
+ * +------------+ +------------+ +-----------------+
+ *
+ * ^ bits 16-18 are direct IRQs for peripherals with banked interrupts, such as
+ * the MSGBOX. These IRQs do not map to any GIC SPI.
+ *
+ * The H6 variant adds two more (banked) direct IRQs and implements the full
+ * set of 128 mux bits. This requires a second set of top-level registers.
+ */
+
+#include <linux/bitmap.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/irqchip.h>
+#include <linux/irqdomain.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+#include <linux/syscore_ops.h>
+
+#include <dt-bindings/interrupt-controller/arm-gic.h>
+
+#define SUN6I_NMI_CTRL (0x0c)
+#define SUN6I_IRQ_PENDING(n) (0x10 + 4 * (n))
+#define SUN6I_IRQ_ENABLE(n) (0x40 + 4 * (n))
+#define SUN6I_MUX_ENABLE(n) (0xc0 + 4 * (n))
+
+#define SUN6I_NMI_SRC_TYPE_LEVEL_LOW 0
+#define SUN6I_NMI_SRC_TYPE_EDGE_FALLING 1
+#define SUN6I_NMI_SRC_TYPE_LEVEL_HIGH 2
+#define SUN6I_NMI_SRC_TYPE_EDGE_RISING 3
+
+#define SUN6I_NMI_BIT BIT(0)
+
+#define SUN6I_NMI_NEEDS_ACK ((void *)1)
+
+#define SUN6I_NR_TOP_LEVEL_IRQS 64
+#define SUN6I_NR_DIRECT_IRQS 16
+#define SUN6I_NR_MUX_BITS 128
+
+struct sun6i_r_intc_variant {
+ u32 first_mux_irq;
+ u32 nr_mux_irqs;
+ u32 mux_valid[BITS_TO_U32(SUN6I_NR_MUX_BITS)];
+};
+
+static void __iomem *base;
+static irq_hw_number_t nmi_hwirq;
+static DECLARE_BITMAP(wake_irq_enabled, SUN6I_NR_TOP_LEVEL_IRQS);
+static DECLARE_BITMAP(wake_mux_enabled, SUN6I_NR_MUX_BITS);
+static DECLARE_BITMAP(wake_mux_valid, SUN6I_NR_MUX_BITS);
+
+static void sun6i_r_intc_ack_nmi(void)
+{
+ writel_relaxed(SUN6I_NMI_BIT, base + SUN6I_IRQ_PENDING(0));
+}
+
+static void sun6i_r_intc_nmi_ack(struct irq_data *data)
+{
+ if (irqd_get_trigger_type(data) & IRQ_TYPE_EDGE_BOTH)
+ sun6i_r_intc_ack_nmi();
+ else
+ data->chip_data = SUN6I_NMI_NEEDS_ACK;
+}
+
+static void sun6i_r_intc_nmi_eoi(struct irq_data *data)
+{
+ /* For oneshot IRQs, delay the ack until the IRQ is unmasked. */
+ if (data->chip_data == SUN6I_NMI_NEEDS_ACK && !irqd_irq_masked(data)) {
+ data->chip_data = NULL;
+ sun6i_r_intc_ack_nmi();
+ }
+
+ irq_chip_eoi_parent(data);
+}
+
+static void sun6i_r_intc_nmi_unmask(struct irq_data *data)
+{
+ if (data->chip_data == SUN6I_NMI_NEEDS_ACK) {
+ data->chip_data = NULL;
+ sun6i_r_intc_ack_nmi();
+ }
+
+ irq_chip_unmask_parent(data);
+}
+
+static int sun6i_r_intc_nmi_set_type(struct irq_data *data, unsigned int type)
+{
+ u32 nmi_src_type;
+
+ switch (type) {
+ case IRQ_TYPE_EDGE_RISING:
+ nmi_src_type = SUN6I_NMI_SRC_TYPE_EDGE_RISING;
+ break;
+ case IRQ_TYPE_EDGE_FALLING:
+ nmi_src_type = SUN6I_NMI_SRC_TYPE_EDGE_FALLING;
+ break;
+ case IRQ_TYPE_LEVEL_HIGH:
+ nmi_src_type = SUN6I_NMI_SRC_TYPE_LEVEL_HIGH;
+ break;
+ case IRQ_TYPE_LEVEL_LOW:
+ nmi_src_type = SUN6I_NMI_SRC_TYPE_LEVEL_LOW;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ writel_relaxed(nmi_src_type, base + SUN6I_NMI_CTRL);
+
+ /*
+ * The "External NMI" GIC input connects to a latch inside R_INTC, not
+ * directly to the pin. So the GIC trigger type does not depend on the
+ * NMI pin trigger type.
+ */
+ return irq_chip_set_type_parent(data, IRQ_TYPE_LEVEL_HIGH);
+}
+
+static int sun6i_r_intc_nmi_set_irqchip_state(struct irq_data *data,
+ enum irqchip_irq_state which,
+ bool state)
+{
+ if (which == IRQCHIP_STATE_PENDING && !state)
+ sun6i_r_intc_ack_nmi();
+
+ return irq_chip_set_parent_state(data, which, state);
+}
+
+static int sun6i_r_intc_irq_set_wake(struct irq_data *data, unsigned int on)
+{
+ unsigned long offset_from_nmi = data->hwirq - nmi_hwirq;
+
+ if (offset_from_nmi < SUN6I_NR_DIRECT_IRQS)
+ assign_bit(offset_from_nmi, wake_irq_enabled, on);
+ else if (test_bit(data->hwirq, wake_mux_valid))
+ assign_bit(data->hwirq, wake_mux_enabled, on);
+ else
+ /* Not wakeup capable. */
+ return -EPERM;
+
+ return 0;
+}
+
+static struct irq_chip sun6i_r_intc_nmi_chip = {
+ .name = "sun6i-r-intc",
+ .irq_ack = sun6i_r_intc_nmi_ack,
+ .irq_mask = irq_chip_mask_parent,
+ .irq_unmask = sun6i_r_intc_nmi_unmask,
+ .irq_eoi = sun6i_r_intc_nmi_eoi,
+ .irq_set_affinity = irq_chip_set_affinity_parent,
+ .irq_set_type = sun6i_r_intc_nmi_set_type,
+ .irq_set_irqchip_state = sun6i_r_intc_nmi_set_irqchip_state,
+ .irq_set_wake = sun6i_r_intc_irq_set_wake,
+ .flags = IRQCHIP_SET_TYPE_MASKED,
+};
+
+static struct irq_chip sun6i_r_intc_wakeup_chip = {
+ .name = "sun6i-r-intc",
+ .irq_mask = irq_chip_mask_parent,
+ .irq_unmask = irq_chip_unmask_parent,
+ .irq_eoi = irq_chip_eoi_parent,
+ .irq_set_affinity = irq_chip_set_affinity_parent,
+ .irq_set_type = irq_chip_set_type_parent,
+ .irq_set_wake = sun6i_r_intc_irq_set_wake,
+ .flags = IRQCHIP_SET_TYPE_MASKED,
+};
+
+static int sun6i_r_intc_domain_translate(struct irq_domain *domain,
+ struct irq_fwspec *fwspec,
+ unsigned long *hwirq,
+ unsigned int *type)
+{
+ /* Accept the old two-cell binding for the NMI only. */
+ if (fwspec->param_count == 2 && fwspec->param[0] == 0) {
+ *hwirq = nmi_hwirq;
+ *type = fwspec->param[1] & IRQ_TYPE_SENSE_MASK;
+ return 0;
+ }
+
+ /* Otherwise this binding should match the GIC SPI binding. */
+ if (fwspec->param_count < 3)
+ return -EINVAL;
+ if (fwspec->param[0] != GIC_SPI)
+ return -EINVAL;
+
+ *hwirq = fwspec->param[1];
+ *type = fwspec->param[2] & IRQ_TYPE_SENSE_MASK;
+
+ return 0;
+}
+
+static int sun6i_r_intc_domain_alloc(struct irq_domain *domain,
+ unsigned int virq,
+ unsigned int nr_irqs, void *arg)
+{
+ struct irq_fwspec *fwspec = arg;
+ struct irq_fwspec gic_fwspec;
+ unsigned long hwirq;
+ unsigned int type;
+ int i, ret;
+
+ ret = sun6i_r_intc_domain_translate(domain, fwspec, &hwirq, &type);
+ if (ret)
+ return ret;
+ if (hwirq + nr_irqs > SUN6I_NR_MUX_BITS)
+ return -EINVAL;
+
+ /* Construct a GIC-compatible fwspec from this fwspec. */
+ gic_fwspec = (struct irq_fwspec) {
+ .fwnode = domain->parent->fwnode,
+ .param_count = 3,
+ .param = { GIC_SPI, hwirq, type },
+ };
+
+ ret = irq_domain_alloc_irqs_parent(domain, virq, nr_irqs, &gic_fwspec);
+ if (ret)
+ return ret;
+
+ for (i = 0; i < nr_irqs; ++i, ++hwirq, ++virq) {
+ if (hwirq == nmi_hwirq) {
+ irq_domain_set_hwirq_and_chip(domain, virq, hwirq,
+ &sun6i_r_intc_nmi_chip, 0);
+ irq_set_handler(virq, handle_fasteoi_ack_irq);
+ } else {
+ irq_domain_set_hwirq_and_chip(domain, virq, hwirq,
+ &sun6i_r_intc_wakeup_chip, 0);
+ }
+ }
+
+ return 0;
+}
+
+static const struct irq_domain_ops sun6i_r_intc_domain_ops = {
+ .translate = sun6i_r_intc_domain_translate,
+ .alloc = sun6i_r_intc_domain_alloc,
+ .free = irq_domain_free_irqs_common,
+};
+
+static int sun6i_r_intc_suspend(void)
+{
+ u32 buf[BITS_TO_U32(max(SUN6I_NR_TOP_LEVEL_IRQS, SUN6I_NR_MUX_BITS))];
+ int i;
+
+ /* Wake IRQs are enabled during system sleep and shutdown. */
+ bitmap_to_arr32(buf, wake_irq_enabled, SUN6I_NR_TOP_LEVEL_IRQS);
+ for (i = 0; i < BITS_TO_U32(SUN6I_NR_TOP_LEVEL_IRQS); ++i)
+ writel_relaxed(buf[i], base + SUN6I_IRQ_ENABLE(i));
+ bitmap_to_arr32(buf, wake_mux_enabled, SUN6I_NR_MUX_BITS);
+ for (i = 0; i < BITS_TO_U32(SUN6I_NR_MUX_BITS); ++i)
+ writel_relaxed(buf[i], base + SUN6I_MUX_ENABLE(i));
+
+ return 0;
+}
+
+static void sun6i_r_intc_resume(void)
+{
+ int i;
+
+ /* Only the NMI is relevant during normal operation. */
+ writel_relaxed(SUN6I_NMI_BIT, base + SUN6I_IRQ_ENABLE(0));
+ for (i = 1; i < BITS_TO_U32(SUN6I_NR_TOP_LEVEL_IRQS); ++i)
+ writel_relaxed(0, base + SUN6I_IRQ_ENABLE(i));
+}
+
+static void sun6i_r_intc_shutdown(void)
+{
+ sun6i_r_intc_suspend();
+}
+
+static struct syscore_ops sun6i_r_intc_syscore_ops = {
+ .suspend = sun6i_r_intc_suspend,
+ .resume = sun6i_r_intc_resume,
+ .shutdown = sun6i_r_intc_shutdown,
+};
+
+static int __init sun6i_r_intc_init(struct device_node *node,
+ struct device_node *parent,
+ const struct sun6i_r_intc_variant *v)
+{
+ struct irq_domain *domain, *parent_domain;
+ struct of_phandle_args nmi_parent;
+ int ret;
+
+ /* Extract the NMI hwirq number from the OF node. */
+ ret = of_irq_parse_one(node, 0, &nmi_parent);
+ if (ret)
+ return ret;
+ if (nmi_parent.args_count < 3 ||
+ nmi_parent.args[0] != GIC_SPI ||
+ nmi_parent.args[2] != IRQ_TYPE_LEVEL_HIGH)
+ return -EINVAL;
+ nmi_hwirq = nmi_parent.args[1];
+
+ bitmap_set(wake_irq_enabled, v->first_mux_irq, v->nr_mux_irqs);
+ bitmap_from_arr32(wake_mux_valid, v->mux_valid, SUN6I_NR_MUX_BITS);
+
+ parent_domain = irq_find_host(parent);
+ if (!parent_domain) {
+ pr_err("%pOF: Failed to obtain parent domain\n", node);
+ return -ENXIO;
+ }
+
+ base = of_io_request_and_map(node, 0, NULL);
+ if (IS_ERR(base)) {
+ pr_err("%pOF: Failed to map MMIO region\n", node);
+ return PTR_ERR(base);
+ }
+
+ domain = irq_domain_add_hierarchy(parent_domain, 0, 0, node,
+ &sun6i_r_intc_domain_ops, NULL);
+ if (!domain) {
+ pr_err("%pOF: Failed to allocate domain\n", node);
+ iounmap(base);
+ return -ENOMEM;
+ }
+
+ register_syscore_ops(&sun6i_r_intc_syscore_ops);
+
+ sun6i_r_intc_ack_nmi();
+ sun6i_r_intc_resume();
+
+ return 0;
+}
+
+static const struct sun6i_r_intc_variant sun6i_a31_r_intc_variant __initconst = {
+ .first_mux_irq = 19,
+ .nr_mux_irqs = 13,
+ .mux_valid = { 0xffffffff, 0xfff80000, 0xffffffff, 0x0000000f },
+};
+
+static int __init sun6i_a31_r_intc_init(struct device_node *node,
+ struct device_node *parent)
+{
+ return sun6i_r_intc_init(node, parent, &sun6i_a31_r_intc_variant);
+}
+IRQCHIP_DECLARE(sun6i_a31_r_intc, "allwinner,sun6i-a31-r-intc", sun6i_a31_r_intc_init);
+
+static const struct sun6i_r_intc_variant sun50i_h6_r_intc_variant __initconst = {
+ .first_mux_irq = 21,
+ .nr_mux_irqs = 16,
+ .mux_valid = { 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff },
+};
+
+static int __init sun50i_h6_r_intc_init(struct device_node *node,
+ struct device_node *parent)
+{
+ return sun6i_r_intc_init(node, parent, &sun50i_h6_r_intc_variant);
+}
+IRQCHIP_DECLARE(sun50i_h6_r_intc, "allwinner,sun50i-h6-r-intc", sun50i_h6_r_intc_init);