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f63c862587
IRQ 0..7 are not supported by the driver for SPEAr320 SOC family.
IRQ 0 is not reserved in SPEAr320 SOC (assigned to GPIOINT).
Furthermore, in SPEAr320s SOC variant, IRQ 0..6 are assigned
as follow:
IRQ 6 - NGPIO_INTR: Combined status of edge programmable
interrupts from GPIO ports
IRQ 5 - TX_OR_INTR: I2S interrupt on Transmit FIFO overrun
IRQ 4 - TX_EMP_INTR: I2S interrupt on Transmit FIFO empty
IRQ 3 - RX_OR_INTR: I2S interrupt on Receive FIFO overrun
IRQ 2 - RX_DA_INTR: I2S interrupt on data available in Receive FIFO
IRQ 1 - Reserved
IRQ 0 - GPIO_INTR: Legacy interrupt from GPIO ports
Add support for these IRQs in SPEAr320 SOC family.
Signed-off-by: Herve Codina <herve.codina@bootlin.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20211202095255.165797-6-herve.codina@bootlin.com
291 lines
7.3 KiB
C
291 lines
7.3 KiB
C
/*
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* SPEAr platform shared irq layer source file
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*
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* Copyright (C) 2009-2012 ST Microelectronics
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* Viresh Kumar <vireshk@kernel.org>
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*
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* Copyright (C) 2012 ST Microelectronics
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* Shiraz Hashim <shiraz.linux.kernel@gmail.com>
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*
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* This file is licensed under the terms of the GNU General Public
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* License version 2. This program is licensed "as is" without any
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* warranty of any kind, whether express or implied.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/err.h>
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#include <linux/export.h>
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#include <linux/interrupt.h>
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#include <linux/io.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/spinlock.h>
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/*
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* struct spear_shirq: shared irq structure
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*
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* base: Base register address
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* status_reg: Status register offset for chained interrupt handler
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* mask_reg: Mask register offset for irq chip
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* mask: Mask to apply to the status register
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* virq_base: Base virtual interrupt number
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* nr_irqs: Number of interrupts handled by this block
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* offset: Bit offset of the first interrupt
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* irq_chip: Interrupt controller chip used for this instance,
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* if NULL group is disabled, but accounted
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*/
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struct spear_shirq {
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void __iomem *base;
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u32 status_reg;
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u32 mask_reg;
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u32 mask;
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u32 virq_base;
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u32 nr_irqs;
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u32 offset;
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struct irq_chip *irq_chip;
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};
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/* spear300 shared irq registers offsets and masks */
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#define SPEAR300_INT_ENB_MASK_REG 0x54
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#define SPEAR300_INT_STS_MASK_REG 0x58
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static DEFINE_RAW_SPINLOCK(shirq_lock);
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static void shirq_irq_mask(struct irq_data *d)
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{
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struct spear_shirq *shirq = irq_data_get_irq_chip_data(d);
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u32 val, shift = d->irq - shirq->virq_base + shirq->offset;
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u32 __iomem *reg = shirq->base + shirq->mask_reg;
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raw_spin_lock(&shirq_lock);
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val = readl(reg) & ~(0x1 << shift);
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writel(val, reg);
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raw_spin_unlock(&shirq_lock);
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}
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static void shirq_irq_unmask(struct irq_data *d)
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{
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struct spear_shirq *shirq = irq_data_get_irq_chip_data(d);
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u32 val, shift = d->irq - shirq->virq_base + shirq->offset;
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u32 __iomem *reg = shirq->base + shirq->mask_reg;
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raw_spin_lock(&shirq_lock);
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val = readl(reg) | (0x1 << shift);
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writel(val, reg);
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raw_spin_unlock(&shirq_lock);
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}
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static struct irq_chip shirq_chip = {
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.name = "spear-shirq",
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.irq_mask = shirq_irq_mask,
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.irq_unmask = shirq_irq_unmask,
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};
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static struct spear_shirq spear300_shirq_ras1 = {
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.offset = 0,
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.nr_irqs = 9,
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.mask = ((0x1 << 9) - 1) << 0,
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.irq_chip = &shirq_chip,
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.status_reg = SPEAR300_INT_STS_MASK_REG,
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.mask_reg = SPEAR300_INT_ENB_MASK_REG,
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};
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static struct spear_shirq *spear300_shirq_blocks[] = {
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&spear300_shirq_ras1,
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};
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/* spear310 shared irq registers offsets and masks */
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#define SPEAR310_INT_STS_MASK_REG 0x04
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static struct spear_shirq spear310_shirq_ras1 = {
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.offset = 0,
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.nr_irqs = 8,
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.mask = ((0x1 << 8) - 1) << 0,
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.irq_chip = &dummy_irq_chip,
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.status_reg = SPEAR310_INT_STS_MASK_REG,
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};
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static struct spear_shirq spear310_shirq_ras2 = {
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.offset = 8,
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.nr_irqs = 5,
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.mask = ((0x1 << 5) - 1) << 8,
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.irq_chip = &dummy_irq_chip,
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.status_reg = SPEAR310_INT_STS_MASK_REG,
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};
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static struct spear_shirq spear310_shirq_ras3 = {
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.offset = 13,
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.nr_irqs = 1,
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.mask = ((0x1 << 1) - 1) << 13,
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.irq_chip = &dummy_irq_chip,
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.status_reg = SPEAR310_INT_STS_MASK_REG,
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};
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static struct spear_shirq spear310_shirq_intrcomm_ras = {
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.offset = 14,
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.nr_irqs = 3,
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.mask = ((0x1 << 3) - 1) << 14,
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.irq_chip = &dummy_irq_chip,
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.status_reg = SPEAR310_INT_STS_MASK_REG,
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};
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static struct spear_shirq *spear310_shirq_blocks[] = {
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&spear310_shirq_ras1,
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&spear310_shirq_ras2,
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&spear310_shirq_ras3,
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&spear310_shirq_intrcomm_ras,
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};
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/* spear320 shared irq registers offsets and masks */
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#define SPEAR320_INT_STS_MASK_REG 0x04
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#define SPEAR320_INT_CLR_MASK_REG 0x04
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#define SPEAR320_INT_ENB_MASK_REG 0x08
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static struct spear_shirq spear320_shirq_ras3 = {
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.offset = 0,
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.nr_irqs = 7,
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.mask = ((0x1 << 7) - 1) << 0,
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.irq_chip = &dummy_irq_chip,
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.status_reg = SPEAR320_INT_STS_MASK_REG,
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};
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static struct spear_shirq spear320_shirq_ras1 = {
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.offset = 7,
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.nr_irqs = 3,
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.mask = ((0x1 << 3) - 1) << 7,
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.irq_chip = &dummy_irq_chip,
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.status_reg = SPEAR320_INT_STS_MASK_REG,
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};
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static struct spear_shirq spear320_shirq_ras2 = {
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.offset = 10,
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.nr_irqs = 1,
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.mask = ((0x1 << 1) - 1) << 10,
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.irq_chip = &dummy_irq_chip,
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.status_reg = SPEAR320_INT_STS_MASK_REG,
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};
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static struct spear_shirq spear320_shirq_intrcomm_ras = {
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.offset = 11,
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.nr_irqs = 11,
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.mask = ((0x1 << 11) - 1) << 11,
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.irq_chip = &dummy_irq_chip,
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.status_reg = SPEAR320_INT_STS_MASK_REG,
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};
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static struct spear_shirq *spear320_shirq_blocks[] = {
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&spear320_shirq_ras3,
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&spear320_shirq_ras1,
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&spear320_shirq_ras2,
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&spear320_shirq_intrcomm_ras,
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};
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static void shirq_handler(struct irq_desc *desc)
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{
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struct spear_shirq *shirq = irq_desc_get_handler_data(desc);
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u32 pend;
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pend = readl(shirq->base + shirq->status_reg) & shirq->mask;
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pend >>= shirq->offset;
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while (pend) {
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int irq = __ffs(pend);
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pend &= ~(0x1 << irq);
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generic_handle_irq(shirq->virq_base + irq);
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}
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}
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static void __init spear_shirq_register(struct spear_shirq *shirq,
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int parent_irq)
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{
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int i;
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if (!shirq->irq_chip)
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return;
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irq_set_chained_handler_and_data(parent_irq, shirq_handler, shirq);
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for (i = 0; i < shirq->nr_irqs; i++) {
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irq_set_chip_and_handler(shirq->virq_base + i,
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shirq->irq_chip, handle_simple_irq);
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irq_set_chip_data(shirq->virq_base + i, shirq);
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}
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}
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static int __init shirq_init(struct spear_shirq **shirq_blocks, int block_nr,
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struct device_node *np)
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{
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int i, parent_irq, virq_base, hwirq = 0, nr_irqs = 0;
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struct irq_domain *shirq_domain;
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void __iomem *base;
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base = of_iomap(np, 0);
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if (!base) {
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pr_err("%s: failed to map shirq registers\n", __func__);
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return -ENXIO;
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}
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for (i = 0; i < block_nr; i++)
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nr_irqs += shirq_blocks[i]->nr_irqs;
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virq_base = irq_alloc_descs(-1, 0, nr_irqs, 0);
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if (virq_base < 0) {
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pr_err("%s: irq desc alloc failed\n", __func__);
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goto err_unmap;
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}
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shirq_domain = irq_domain_add_legacy(np, nr_irqs, virq_base, 0,
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&irq_domain_simple_ops, NULL);
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if (WARN_ON(!shirq_domain)) {
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pr_warn("%s: irq domain init failed\n", __func__);
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goto err_free_desc;
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}
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for (i = 0; i < block_nr; i++) {
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shirq_blocks[i]->base = base;
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shirq_blocks[i]->virq_base = irq_find_mapping(shirq_domain,
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hwirq);
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parent_irq = irq_of_parse_and_map(np, i);
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spear_shirq_register(shirq_blocks[i], parent_irq);
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hwirq += shirq_blocks[i]->nr_irqs;
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}
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return 0;
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err_free_desc:
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irq_free_descs(virq_base, nr_irqs);
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err_unmap:
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iounmap(base);
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return -ENXIO;
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}
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static int __init spear300_shirq_of_init(struct device_node *np,
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struct device_node *parent)
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{
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return shirq_init(spear300_shirq_blocks,
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ARRAY_SIZE(spear300_shirq_blocks), np);
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}
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IRQCHIP_DECLARE(spear300_shirq, "st,spear300-shirq", spear300_shirq_of_init);
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static int __init spear310_shirq_of_init(struct device_node *np,
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struct device_node *parent)
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{
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return shirq_init(spear310_shirq_blocks,
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ARRAY_SIZE(spear310_shirq_blocks), np);
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}
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IRQCHIP_DECLARE(spear310_shirq, "st,spear310-shirq", spear310_shirq_of_init);
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static int __init spear320_shirq_of_init(struct device_node *np,
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struct device_node *parent)
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{
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return shirq_init(spear320_shirq_blocks,
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ARRAY_SIZE(spear320_shirq_blocks), np);
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}
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IRQCHIP_DECLARE(spear320_shirq, "st,spear320-shirq", spear320_shirq_of_init);
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