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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
commit | ace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch) | |
tree | b2d64bc10158fdd5497876388cd68142ca374ed3 /drivers/irqchip/spear-shirq.c | |
parent | Initial commit. (diff) | |
download | linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip |
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/irqchip/spear-shirq.c')
-rw-r--r-- | drivers/irqchip/spear-shirq.c | 290 |
1 files changed, 290 insertions, 0 deletions
diff --git a/drivers/irqchip/spear-shirq.c b/drivers/irqchip/spear-shirq.c new file mode 100644 index 0000000000..7c17a6f643 --- /dev/null +++ b/drivers/irqchip/spear-shirq.c @@ -0,0 +1,290 @@ +/* + * SPEAr platform shared irq layer source file + * + * Copyright (C) 2009-2012 ST Microelectronics + * Viresh Kumar <vireshk@kernel.org> + * + * Copyright (C) 2012 ST Microelectronics + * Shiraz Hashim <shiraz.linux.kernel@gmail.com> + * + * This file is licensed under the terms of the GNU General Public + * License version 2. This program is licensed "as is" without any + * warranty of any kind, whether express or implied. + */ +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include <linux/err.h> +#include <linux/export.h> +#include <linux/interrupt.h> +#include <linux/io.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/spinlock.h> + +/* + * struct spear_shirq: shared irq structure + * + * base: Base register address + * status_reg: Status register offset for chained interrupt handler + * mask_reg: Mask register offset for irq chip + * mask: Mask to apply to the status register + * virq_base: Base virtual interrupt number + * nr_irqs: Number of interrupts handled by this block + * offset: Bit offset of the first interrupt + * irq_chip: Interrupt controller chip used for this instance, + * if NULL group is disabled, but accounted + */ +struct spear_shirq { + void __iomem *base; + u32 status_reg; + u32 mask_reg; + u32 mask; + u32 virq_base; + u32 nr_irqs; + u32 offset; + struct irq_chip *irq_chip; +}; + +/* spear300 shared irq registers offsets and masks */ +#define SPEAR300_INT_ENB_MASK_REG 0x54 +#define SPEAR300_INT_STS_MASK_REG 0x58 + +static DEFINE_RAW_SPINLOCK(shirq_lock); + +static void shirq_irq_mask(struct irq_data *d) +{ + struct spear_shirq *shirq = irq_data_get_irq_chip_data(d); + u32 val, shift = d->irq - shirq->virq_base + shirq->offset; + u32 __iomem *reg = shirq->base + shirq->mask_reg; + + raw_spin_lock(&shirq_lock); + val = readl(reg) & ~(0x1 << shift); + writel(val, reg); + raw_spin_unlock(&shirq_lock); +} + +static void shirq_irq_unmask(struct irq_data *d) +{ + struct spear_shirq *shirq = irq_data_get_irq_chip_data(d); + u32 val, shift = d->irq - shirq->virq_base + shirq->offset; + u32 __iomem *reg = shirq->base + shirq->mask_reg; + + raw_spin_lock(&shirq_lock); + val = readl(reg) | (0x1 << shift); + writel(val, reg); + raw_spin_unlock(&shirq_lock); +} + +static struct irq_chip shirq_chip = { + .name = "spear-shirq", + .irq_mask = shirq_irq_mask, + .irq_unmask = shirq_irq_unmask, +}; + +static struct spear_shirq spear300_shirq_ras1 = { + .offset = 0, + .nr_irqs = 9, + .mask = ((0x1 << 9) - 1) << 0, + .irq_chip = &shirq_chip, + .status_reg = SPEAR300_INT_STS_MASK_REG, + .mask_reg = SPEAR300_INT_ENB_MASK_REG, +}; + +static struct spear_shirq *spear300_shirq_blocks[] = { + &spear300_shirq_ras1, +}; + +/* spear310 shared irq registers offsets and masks */ +#define SPEAR310_INT_STS_MASK_REG 0x04 + +static struct spear_shirq spear310_shirq_ras1 = { + .offset = 0, + .nr_irqs = 8, + .mask = ((0x1 << 8) - 1) << 0, + .irq_chip = &dummy_irq_chip, + .status_reg = SPEAR310_INT_STS_MASK_REG, +}; + +static struct spear_shirq spear310_shirq_ras2 = { + .offset = 8, + .nr_irqs = 5, + .mask = ((0x1 << 5) - 1) << 8, + .irq_chip = &dummy_irq_chip, + .status_reg = SPEAR310_INT_STS_MASK_REG, +}; + +static struct spear_shirq spear310_shirq_ras3 = { + .offset = 13, + .nr_irqs = 1, + .mask = ((0x1 << 1) - 1) << 13, + .irq_chip = &dummy_irq_chip, + .status_reg = SPEAR310_INT_STS_MASK_REG, +}; + +static struct spear_shirq spear310_shirq_intrcomm_ras = { + .offset = 14, + .nr_irqs = 3, + .mask = ((0x1 << 3) - 1) << 14, + .irq_chip = &dummy_irq_chip, + .status_reg = SPEAR310_INT_STS_MASK_REG, +}; + +static struct spear_shirq *spear310_shirq_blocks[] = { + &spear310_shirq_ras1, + &spear310_shirq_ras2, + &spear310_shirq_ras3, + &spear310_shirq_intrcomm_ras, +}; + +/* spear320 shared irq registers offsets and masks */ +#define SPEAR320_INT_STS_MASK_REG 0x04 +#define SPEAR320_INT_CLR_MASK_REG 0x04 +#define SPEAR320_INT_ENB_MASK_REG 0x08 + +static struct spear_shirq spear320_shirq_ras3 = { + .offset = 0, + .nr_irqs = 7, + .mask = ((0x1 << 7) - 1) << 0, + .irq_chip = &dummy_irq_chip, + .status_reg = SPEAR320_INT_STS_MASK_REG, +}; + +static struct spear_shirq spear320_shirq_ras1 = { + .offset = 7, + .nr_irqs = 3, + .mask = ((0x1 << 3) - 1) << 7, + .irq_chip = &dummy_irq_chip, + .status_reg = SPEAR320_INT_STS_MASK_REG, +}; + +static struct spear_shirq spear320_shirq_ras2 = { + .offset = 10, + .nr_irqs = 1, + .mask = ((0x1 << 1) - 1) << 10, + .irq_chip = &dummy_irq_chip, + .status_reg = SPEAR320_INT_STS_MASK_REG, +}; + +static struct spear_shirq spear320_shirq_intrcomm_ras = { + .offset = 11, + .nr_irqs = 11, + .mask = ((0x1 << 11) - 1) << 11, + .irq_chip = &dummy_irq_chip, + .status_reg = SPEAR320_INT_STS_MASK_REG, +}; + +static struct spear_shirq *spear320_shirq_blocks[] = { + &spear320_shirq_ras3, + &spear320_shirq_ras1, + &spear320_shirq_ras2, + &spear320_shirq_intrcomm_ras, +}; + +static void shirq_handler(struct irq_desc *desc) +{ + struct spear_shirq *shirq = irq_desc_get_handler_data(desc); + u32 pend; + + pend = readl(shirq->base + shirq->status_reg) & shirq->mask; + pend >>= shirq->offset; + + while (pend) { + int irq = __ffs(pend); + + pend &= ~(0x1 << irq); + generic_handle_irq(shirq->virq_base + irq); + } +} + +static void __init spear_shirq_register(struct spear_shirq *shirq, + int parent_irq) +{ + int i; + + if (!shirq->irq_chip) + return; + + irq_set_chained_handler_and_data(parent_irq, shirq_handler, shirq); + + for (i = 0; i < shirq->nr_irqs; i++) { + irq_set_chip_and_handler(shirq->virq_base + i, + shirq->irq_chip, handle_simple_irq); + irq_set_chip_data(shirq->virq_base + i, shirq); + } +} + +static int __init shirq_init(struct spear_shirq **shirq_blocks, int block_nr, + struct device_node *np) +{ + int i, parent_irq, virq_base, hwirq = 0, nr_irqs = 0; + struct irq_domain *shirq_domain; + void __iomem *base; + + base = of_iomap(np, 0); + if (!base) { + pr_err("%s: failed to map shirq registers\n", __func__); + return -ENXIO; + } + + for (i = 0; i < block_nr; i++) + nr_irqs += shirq_blocks[i]->nr_irqs; + + virq_base = irq_alloc_descs(-1, 0, nr_irqs, 0); + if (virq_base < 0) { + pr_err("%s: irq desc alloc failed\n", __func__); + goto err_unmap; + } + + shirq_domain = irq_domain_add_legacy(np, nr_irqs, virq_base, 0, + &irq_domain_simple_ops, NULL); + if (WARN_ON(!shirq_domain)) { + pr_warn("%s: irq domain init failed\n", __func__); + goto err_free_desc; + } + + for (i = 0; i < block_nr; i++) { + shirq_blocks[i]->base = base; + shirq_blocks[i]->virq_base = irq_find_mapping(shirq_domain, + hwirq); + + parent_irq = irq_of_parse_and_map(np, i); + spear_shirq_register(shirq_blocks[i], parent_irq); + hwirq += shirq_blocks[i]->nr_irqs; + } + + return 0; + +err_free_desc: + irq_free_descs(virq_base, nr_irqs); +err_unmap: + iounmap(base); + return -ENXIO; +} + +static int __init spear300_shirq_of_init(struct device_node *np, + struct device_node *parent) +{ + return shirq_init(spear300_shirq_blocks, + ARRAY_SIZE(spear300_shirq_blocks), np); +} +IRQCHIP_DECLARE(spear300_shirq, "st,spear300-shirq", spear300_shirq_of_init); + +static int __init spear310_shirq_of_init(struct device_node *np, + struct device_node *parent) +{ + return shirq_init(spear310_shirq_blocks, + ARRAY_SIZE(spear310_shirq_blocks), np); +} +IRQCHIP_DECLARE(spear310_shirq, "st,spear310-shirq", spear310_shirq_of_init); + +static int __init spear320_shirq_of_init(struct device_node *np, + struct device_node *parent) +{ + return shirq_init(spear320_shirq_blocks, + ARRAY_SIZE(spear320_shirq_blocks), np); +} +IRQCHIP_DECLARE(spear320_shirq, "st,spear320-shirq", spear320_shirq_of_init); 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