linux-5.3.12/drivers/irqchip/irq-sunxi-nmi.c
关注和sun8i字样相关的修改
/*
* Allwinner A20/A31 SoCs NMI IRQ chip driver.
*
* Carlo Caione <carlo.caione@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 DRV_NAME "sunxi-nmi"
#define pr_fmt(fmt) DRV_NAME ": " fmt
#include <linux/bitops.h>
#include <linux/device.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/interrupt.h>
#include <linux/irqdomain.h>
#include <linux/of_irq.h>
#include <linux/of_address.h>
#include <linux/of_platform.h>
#include <linux/irqchip.h>
#include <linux/irqchip/chained_irq.h>
#define SUNXI_NMI_SRC_TYPE_MASK 0x00000003
#define SUNXI_NMI_IRQ_BIT BIT(0)
#define SUN6I_R_INTC_CTRL 0x0c
#define SUN6I_R_INTC_PENDING 0x10
#define SUN6I_R_INTC_ENABLE 0x40
/*
* For deprecated sun6i-a31-sc-nmi compatible.
* Registers are offset by 0x0c.
*/
#define SUN6I_R_INTC_NMI_OFFSET 0x0c
#define SUN6I_NMI_CTRL (SUN6I_R_INTC_CTRL - SUN6I_R_INTC_NMI_OFFSET)
#define SUN6I_NMI_PENDING (SUN6I_R_INTC_PENDING - SUN6I_R_INTC_NMI_OFFSET)
#define SUN6I_NMI_ENABLE (SUN6I_R_INTC_ENABLE - SUN6I_R_INTC_NMI_OFFSET)
#define SUN7I_NMI_CTRL 0x00
#define SUN7I_NMI_PENDING 0x04
#define SUN7I_NMI_ENABLE 0x08
#define SUN9I_NMI_CTRL 0x00
#define SUN9I_NMI_ENABLE 0x04
#define SUN9I_NMI_PENDING 0x08
#define SUN8I_NMI_CTRL 0xd0
#define SUN8I_NMI_ENABLE 0xd4
#define SUN8I_NMI_PENDING 0xd8
enum {
SUNXI_SRC_TYPE_LEVEL_LOW = 0,
SUNXI_SRC_TYPE_EDGE_FALLING,
SUNXI_SRC_TYPE_LEVEL_HIGH,
SUNXI_SRC_TYPE_EDGE_RISING,
};
struct sunxi_sc_nmi_reg_offs {
u32 ctrl;
u32 pend;
u32 enable;
};
static const struct sunxi_sc_nmi_reg_offs sun6i_r_intc_reg_offs __initconst = {
.ctrl = SUN6I_R_INTC_CTRL,
.pend = SUN6I_R_INTC_PENDING,
.enable = SUN6I_R_INTC_ENABLE,
};
static const struct sunxi_sc_nmi_reg_offs sun6i_reg_offs __initconst = {
.ctrl = SUN6I_NMI_CTRL,
.pend = SUN6I_NMI_PENDING,
.enable = SUN6I_NMI_ENABLE,
};
static const struct sunxi_sc_nmi_reg_offs sun7i_reg_offs __initconst = {
.ctrl = SUN7I_NMI_CTRL,
.pend = SUN7I_NMI_PENDING,
.enable = SUN7I_NMI_ENABLE,
};
static const struct sunxi_sc_nmi_reg_offs sun9i_reg_offs __initconst = {
.ctrl = SUN9I_NMI_CTRL,
.pend = SUN9I_NMI_PENDING,
.enable = SUN9I_NMI_ENABLE,
};
static const struct sunxi_sc_nmi_reg_offs sun8i_reg_offs __initconst = {
.ctrl = SUN8I_NMI_CTRL,
.pend = SUN8I_NMI_PENDING,
.enable = SUN8I_NMI_ENABLE,
};
static inline void sunxi_sc_nmi_write(struct irq_chip_generic *gc, u32 off,
u32 val)
{
irq_reg_writel(gc, val, off);
}
static inline u32 sunxi_sc_nmi_read(struct irq_chip_generic *gc, u32 off)
{
return irq_reg_readl(gc, off);
}
static void sunxi_sc_nmi_handle_irq(struct irq_desc *desc)
{
struct irq_domain *domain = irq_desc_get_handler_data(desc);
struct irq_chip *chip = irq_desc_get_chip(desc);
unsigned int virq = irq_find_mapping(domain, 0);
chained_irq_enter(chip, desc);
generic_handle_irq(virq);
chained_irq_exit(chip, desc);
}
static int sunxi_sc_nmi_set_type(struct irq_data *data, unsigned int flow_type)
{
struct irq_chip_generic *gc = irq_data_get_irq_chip_data(data);
struct irq_chip_type *ct = gc->chip_types;
u32 src_type_reg;
u32 ctrl_off = ct->regs.type;
unsigned int src_type;
unsigned int i;
irq_gc_lock(gc);
switch (flow_type & IRQF_TRIGGER_MASK) {
case IRQ_TYPE_EDGE_FALLING:
src_type = SUNXI_SRC_TYPE_EDGE_FALLING;
break;
case IRQ_TYPE_EDGE_RISING:
src_type = SUNXI_SRC_TYPE_EDGE_RISING;
break;
case IRQ_TYPE_LEVEL_HIGH:
src_type = SUNXI_SRC_TYPE_LEVEL_HIGH;
break;
case IRQ_TYPE_NONE:
case IRQ_TYPE_LEVEL_LOW:
src_type = SUNXI_SRC_TYPE_LEVEL_LOW;
break;
default:
irq_gc_unlock(gc);
pr_err("Cannot assign multiple trigger modes to IRQ %d.\n",
data->irq);
return -EBADR;
}
irqd_set_trigger_type(data, flow_type);
irq_setup_alt_chip(data, flow_type);
for (i = 0; i < gc->num_ct; i++, ct++)
if (ct->type & flow_type)
ctrl_off = ct->regs.type;
src_type_reg = sunxi_sc_nmi_read(gc, ctrl_off);
src_type_reg &= ~SUNXI_NMI_SRC_TYPE_MASK;
src_type_reg |= src_type;
sunxi_sc_nmi_write(gc, ctrl_off, src_type_reg);
irq_gc_unlock(gc);
return IRQ_SET_MASK_OK;
}
static int __init sunxi_sc_nmi_irq_init(struct device_node *node,
const struct sunxi_sc_nmi_reg_offs *reg_offs)
{
struct irq_domain *domain;
struct irq_chip_generic *gc;
unsigned int irq;
unsigned int clr = IRQ_NOREQUEST | IRQ_NOPROBE | IRQ_NOAUTOEN;
int ret;
domain = irq_domain_add_linear(node, 1, &irq_generic_chip_ops, NULL);
if (!domain) {
pr_err("Could not register interrupt domain.\n");
return -ENOMEM;
}
ret = irq_alloc_domain_generic_chips(domain, 1, 2, DRV_NAME,
handle_fasteoi_irq, clr, 0,
IRQ_GC_INIT_MASK_CACHE);
if (ret) {
pr_err("Could not allocate generic interrupt chip.\n");
goto fail_irqd_remove;
}
irq = irq_of_parse_and_map(node, 0);
if (irq <= 0) {
pr_err("unable to parse irq\n");
ret = -EINVAL;
goto fail_irqd_remove;
}
gc = irq_get_domain_generic_chip(domain, 0);
gc->reg_base = of_io_request_and_map(node, 0, of_node_full_name(node));
if (IS_ERR(gc->reg_base)) {
pr_err("unable to map resource\n");
ret = PTR_ERR(gc->reg_base);
goto fail_irqd_remove;
}
gc->chip_types[0].type = IRQ_TYPE_LEVEL_MASK;
gc->chip_types[0].chip.irq_mask = irq_gc_mask_clr_bit;
gc->chip_types[0].chip.irq_unmask = irq_gc_mask_set_bit;
gc->chip_types[0].chip.irq_eoi = irq_gc_ack_set_bit;
gc->chip_types[0].chip.irq_set_type = sunxi_sc_nmi_set_type;
gc->chip_types[0].chip.flags = IRQCHIP_EOI_THREADED | IRQCHIP_EOI_IF_HANDLED;
gc->chip_types[0].regs.ack = reg_offs->pend;
gc->chip_types[0].regs.mask = reg_offs->enable;
gc->chip_types[0].regs.type = reg_offs->ctrl;
gc->chip_types[1].type = IRQ_TYPE_EDGE_BOTH;
gc->chip_types[1].chip.name = gc->chip_types[0].chip.name;
gc->chip_types[1].chip.irq_ack = irq_gc_ack_set_bit;
gc->chip_types[1].chip.irq_mask = irq_gc_mask_clr_bit;
gc->chip_types[1].chip.irq_unmask = irq_gc_mask_set_bit;
gc->chip_types[1].chip.irq_set_type = sunxi_sc_nmi_set_type;
gc->chip_types[1].regs.ack = reg_offs->pend;
gc->chip_types[1].regs.mask = reg_offs->enable;
gc->chip_types[1].regs.type = reg_offs->ctrl;
gc->chip_types[1].handler = handle_edge_irq;
/* Disable any active interrupts */
sunxi_sc_nmi_write(gc, reg_offs->enable, 0);
/* Clear any pending NMI interrupts */
sunxi_sc_nmi_write(gc, reg_offs->pend, SUNXI_NMI_IRQ_BIT);
irq_set_chained_handler_and_data(irq, sunxi_sc_nmi_handle_irq, domain);
return 0;
fail_irqd_remove:
irq_domain_remove(domain);
return ret;
}
static int __init sun6i_r_intc_irq_init(struct device_node *node,
struct device_node *parent)
{
return sunxi_sc_nmi_irq_init(node, &sun6i_r_intc_reg_offs);
}
IRQCHIP_DECLARE(sun6i_r_intc, "allwinner,sun6i-a31-r-intc",
sun6i_r_intc_irq_init);
static int __init sun6i_sc_nmi_irq_init(struct device_node *node,
struct device_node *parent)
{
return sunxi_sc_nmi_irq_init(node, &sun6i_reg_offs);
}
IRQCHIP_DECLARE(sun6i_sc_nmi, "allwinner,sun6i-a31-sc-nmi", sun6i_sc_nmi_irq_init);
static int __init sun7i_sc_nmi_irq_init(struct device_node *node,
struct device_node *parent)
{
return sunxi_sc_nmi_irq_init(node, &sun7i_reg_offs);
}
IRQCHIP_DECLARE(sun7i_sc_nmi, "allwinner,sun7i-a20-sc-nmi", sun7i_sc_nmi_irq_init);
static int __init sun9i_nmi_irq_init(struct device_node *node,
struct device_node *parent)
{
return sunxi_sc_nmi_irq_init(node, &sun9i_reg_offs);
}
IRQCHIP_DECLARE(sun9i_nmi, "allwinner,sun9i-a80-nmi", sun9i_nmi_irq_init);
static int __init sun8i_nmi_irq_init(struct device_node *node,
struct device_node *parent)
{
return sunxi_sc_nmi_irq_init(node, &sun8i_reg_offs);
}
IRQCHIP_DECLARE(sun8i_nmi, "allwinner,sun8i-v3s-nmi", sun8i_nmi_irq_init);sun8i-s3.dtsi
在gic控制器下方增加
nmi_intc: interrupt-controller@01c00000 {
compatible = "allwinner,sun8i-v3s-nmi";
interrupt-controller;
#interrupt-cells = <2>;
reg = <0x01c00000 0x400>;
interrupts = <GIC_SPI 32 IRQ_TYPE_LEVEL_HIGH>;
};离线
没看懂呢，楼主可以解释一下吗?
就是让片子的NMI引脚可以正确产生中断信号的驱动。
这个引脚一般用来和AXP这种电源管理芯片通信用
离线
具体通讯什么呢?休眠/唤醒吗?
这个就是产生个中断提示MPU该去读一下AXP209的寄存器了，具体是电源按钮被按下了啊，还是AC电源插入了啊，还是GPIO变化了啊，不是NMI负责的，NMI只负责提示MPU你该去看看AXP209发生了啥
离线