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