SH7751 have 15 level external interrupt. It is typically connected to the CPU through a priority encoder that can suppress requests. This driver provides a way to control those hardware with irqchip. Signed-off-by: Yoshinori Sato <ysato@xxxxxxxxxxxxxxxxxxxx> --- drivers/irqchip/Kconfig | 7 + drivers/irqchip/Makefile | 2 + drivers/irqchip/irq-renesas-sh7751irl.c | 227 ++++++++++++++++++++++++ 3 files changed, 236 insertions(+) create mode 100644 drivers/irqchip/irq-renesas-sh7751irl.c diff --git a/drivers/irqchip/Kconfig b/drivers/irqchip/Kconfig index 658523f65b1d..2a061c01f381 100644 --- a/drivers/irqchip/Kconfig +++ b/drivers/irqchip/Kconfig @@ -687,4 +687,11 @@ config RENESAS_SH7751_INTC Support for the Renesas SH7751 On-chip interrupt controller. And external interrupt encoder for some targets. +config RENESAS_SH7751IRL_INTC + bool "Renesas SH7751 based target IRL encoder support." + depends on RENESAS_SH7751_INTC + help + Support for External Interrupt encoder + on the some Renesas SH7751 based target. + endmenu diff --git a/drivers/irqchip/Makefile b/drivers/irqchip/Makefile index 26c91d075e25..91df16726b1f 100644 --- a/drivers/irqchip/Makefile +++ b/drivers/irqchip/Makefile @@ -121,3 +121,5 @@ obj-$(CONFIG_APPLE_AIC) += irq-apple-aic.o obj-$(CONFIG_MCHP_EIC) += irq-mchp-eic.o obj-$(CONFIG_SUNPLUS_SP7021_INTC) += irq-sp7021-intc.o obj-$(CONFIG_RENESAS_SH7751_INTC) += irq-renesas-sh7751.o +obj-$(CONFIG_RENESAS_SH7751IRL_INTC) += irq-renesas-sh7751irl.o + diff --git a/drivers/irqchip/irq-renesas-sh7751irl.c b/drivers/irqchip/irq-renesas-sh7751irl.c new file mode 100644 index 000000000000..99ee5bf9fb1e --- /dev/null +++ b/drivers/irqchip/irq-renesas-sh7751irl.c @@ -0,0 +1,227 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * SH7751 based board IRL encoder driver + * (Renesas RTS7751R2D / IO DATA DEVICE LANDISK, USL-5P) + * + * Copyright (C) 2023 Yoshinori Sato + */ + +#include <linux/err.h> +#include <linux/init.h> +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/irqdomain.h> +#include <linux/irq.h> +#include <linux/irqchip.h> +#include <linux/of.h> +#include <linux/of_irq.h> +#include <linux/of_address.h> +#include <linux/slab.h> +#include <linux/bitops.h> + +struct sh7751irl_intc_priv { + struct irq_domain *irq_domain; + void __iomem *base; + unsigned int width; + bool invert; + u32 enable_bit[NR_IRL]; +}; + +static inline unsigned long get_reg(void __iomem *addr, unsigned int w) +{ + switch (w) { + case 8: + return __raw_readb(addr); + case 16: + return __raw_readw(addr); + case 32: + return __raw_readl(addr); + default: + /* The size is checked when reading the properties. */ + pr_err("%s: Invalid width %d", __FILE__, w); + return 0; + } +} + +static inline void set_reg(void __iomem *addr, unsigned int w, unsigned long val) +{ + switch (w) { + case 8: + __raw_writeb(val, addr); + break; + case 16: + __raw_writew(val, addr); + break; + case 32: + __raw_writel(val, addr); + break; + default: + pr_err("%s: Invalid width %d", __FILE__, w); + } +} + +static inline struct sh7751irl_intc_priv *irq_data_to_priv(struct irq_data *data) +{ + return data->domain->host_data; +} + +static void irl_endisable(struct irq_data *data, unsigned int enable) +{ + struct sh7751irl_intc_priv *priv; + unsigned long val; + unsigned int irl; + + priv = irq_data_to_priv(data); + irl = irqd_to_hwirq(data) - IRL_BASE_IRQ; + + if (irl < NR_IRL && priv->enable_bit[irl] < priv->width) { + if (priv->invert) + enable = !enable; + + val = get_reg(priv->base, priv->width); + if (enable) + set_bit(priv->enable_bit[irl], &val); + else + clear_bit(priv->enable_bit[irl], &val); + set_reg(priv->base, priv->width, val); + } else { + pr_err("%s: Invalid register define in IRL %u", __FILE__, irl); + } +} + +static void sh7751irl_intc_disable_irq(struct irq_data *data) +{ + irl_endisable(data, 0); +} + +static void sh7751irl_intc_enable_irq(struct irq_data *data) +{ + irl_endisable(data, 1); +} + +static struct irq_chip sh7751irl_intc_chip = { + .name = "SH7751IRL-INTC", + .irq_enable = sh7751irl_intc_enable_irq, + .irq_disable = sh7751irl_intc_disable_irq, +}; + +static int sh7751irl_intc_map(struct irq_domain *h, unsigned int virq, + irq_hw_number_t hw_irq_num) +{ + irq_set_chip_and_handler(virq, &sh7751irl_intc_chip, handle_level_irq); + irq_get_irq_data(virq)->chip_data = h->host_data; + irq_modify_status(virq, IRQ_NOREQUEST, IRQ_NOPROBE); + return 0; +} + +static int sh7751irl_intc_translate(struct irq_domain *domain, + struct irq_fwspec *fwspec, unsigned long *hwirq, + unsigned int *type) +{ + if (fwspec->param[0] > NR_IRL) + return -EINVAL; + + switch (fwspec->param_count) { + case 2: + *type = fwspec->param[1]; + fallthrough; + case 1: + *hwirq = fwspec->param[0] + IRL_BASE_IRQ; + break; + default: + return -EINVAL; + } + return 0; +} + +static const struct irq_domain_ops sh7751irl_intc_domain_ops = { + .map = sh7751irl_intc_map, + .translate = sh7751irl_intc_translate, +}; + +static int __init load_irq_bit(struct device_node *node, struct sh7751irl_intc_priv *priv) +{ + struct property *enable_map; + const __be32 *p; + u32 nr_bits; + u32 irl; + int ret; + + /* Fill in unused */ + memset(priv->enable_bit, ~0, sizeof(priv->enable_bit)); + + enable_map = of_find_property(node, "renesas,enable-bit", &nr_bits); + if (IS_ERR(enable_map)) + return PTR_ERR(enable_map); + + nr_bits /= sizeof(u32); + /* 2words per entry. */ + if (nr_bits % 2) + return -EINVAL; + nr_bits /= 2; + if (nr_bits > NR_IRL) + return -EINVAL; + + ret = nr_bits; + p = NULL; + for (; nr_bits > 0; nr_bits--) { + /* 1st word - IRL */ + p = of_prop_next_u32(enable_map, p, &irl); + if (!p || irl > NR_IRL) + return -EINVAL; + /* 2nd word - enable bit index */ + p = of_prop_next_u32(enable_map, p, &priv->enable_bit[irl]); + if (priv->enable_bit[irl] >= priv->width) + return -EINVAL; + } + return ret; +} + +static int __init sh7751irl_init(struct device_node *node, struct device_node *parent) +{ + struct sh7751irl_intc_priv *priv; + struct irq_domain *d; + void __iomem *base; + int ret = 0; + + base = of_iomap(node, 0); + if (!base) + ret = -EINVAL; + + priv = kzalloc(sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + priv->base = base; + of_property_read_u32(node, "renesas,width", &priv->width); + if (priv->width != 8 && priv->width != 16 && priv->width != 32) { + pr_err("%pOFP: Invalid register width.\n", node); + ret = -EINVAL; + goto error; + } + + priv->invert = of_property_read_bool(node, "renesas,set-to-disable"); + + ret = load_irq_bit(node, priv); + if (ret < 0) { + pr_err("%pOFP: Invalid register define.\n", node); + goto error; + } + + d = irq_domain_add_tree(node, &sh7751irl_intc_domain_ops, priv); + if (d == NULL) { + pr_err("%pOFP: cannot initialize irq domain\n", node); + ret = -ENOMEM; + goto error; + } + + priv->irq_domain = d; + irq_domain_update_bus_token(d, DOMAIN_BUS_WIRED); + pr_info("%pOFP: SH7751 External Interrupt encoder (input=%d)", node, ret); + return 0; +error: + kfree(priv); + return ret; +} + +IRQCHIP_DECLARE(renesas_sh7751_irl, "renesas,sh7751-irl-ext", sh7751irl_init); -- 2.39.2