i.MX8qxp Display Controller has a built-in interrupt controller to support
Enable/Status/Preset/Clear interrupt bit. Add driver for it.
Signed-off-by: Liu Ying <victor.liu@xxxxxxx>
---
v6:
* No change.
v5:
* Replace .remove_new with .remove in dc-ic.c. (Uwe)
v4:
* Use regmap to define register map for all registers. (Dmitry)
* Use regmap APIs to access registers. (Dmitry)
* Use devm_kzalloc() to drmm_kzalloc() to allocate dc_ic_data data strutures.
* Set suppress_bind_attrs driver flag to true to avoid unnecessary sys
interfaces to bind/unbind the driver.
* Take DC interrupt controller driver as a standalone driver instead of a
component driver.
* Replace drmm_kcalloc() with devm_kcalloc() to allocate an array for
struct dc_ic_entry.
* Call platform_get_irq() from DC interrupt controller driver to make sure
parent interrupt controller driver is probed first.
v3:
* No change.
v2:
* No change.
drivers/gpu/drm/imx/dc/Kconfig | 1 +
drivers/gpu/drm/imx/dc/Makefile | 2 +-
drivers/gpu/drm/imx/dc/dc-drv.c | 1 +
drivers/gpu/drm/imx/dc/dc-drv.h | 1 +
drivers/gpu/drm/imx/dc/dc-ic.c | 279 ++++++++++++++++++++++++++++++++
5 files changed, 283 insertions(+), 1 deletion(-)
create mode 100644 drivers/gpu/drm/imx/dc/dc-ic.c
diff --git a/drivers/gpu/drm/imx/dc/Kconfig b/drivers/gpu/drm/imx/dc/Kconfig
index e1ef76d82830..1fc84c7475de 100644
--- a/drivers/gpu/drm/imx/dc/Kconfig
+++ b/drivers/gpu/drm/imx/dc/Kconfig
@@ -1,6 +1,7 @@
config DRM_IMX8_DC
tristate "Freescale i.MX8 Display Controller Graphics"
depends on DRM && COMMON_CLK && OF && (ARCH_MXC || COMPILE_TEST)
+ select GENERIC_IRQ_CHIP
select REGMAP
select REGMAP_MMIO
help
diff --git a/drivers/gpu/drm/imx/dc/Makefile b/drivers/gpu/drm/imx/dc/Makefile
index 2942ae6fd5bd..1ce3e8a8db22 100644
--- a/drivers/gpu/drm/imx/dc/Makefile
+++ b/drivers/gpu/drm/imx/dc/Makefile
@@ -1,6 +1,6 @@
# SPDX-License-Identifier: GPL-2.0
imx8-dc-drm-objs := dc-cf.o dc-de.o dc-drv.o dc-ed.o dc-fg.o dc-fl.o dc-fu.o \
- dc-fw.o dc-lb.o dc-pe.o dc-tc.o
+ dc-fw.o dc-ic.o dc-lb.o dc-pe.o dc-tc.o
obj-$(CONFIG_DRM_IMX8_DC) += imx8-dc-drm.o
diff --git a/drivers/gpu/drm/imx/dc/dc-drv.c b/drivers/gpu/drm/imx/dc/dc-drv.c
index 7c64acc863ad..fd68861f770a 100644
--- a/drivers/gpu/drm/imx/dc/dc-drv.c
+++ b/drivers/gpu/drm/imx/dc/dc-drv.c
@@ -15,6 +15,7 @@ static struct platform_driver * const dc_drivers[] = {
&dc_fg_driver,
&dc_fl_driver,
&dc_fw_driver,
+ &dc_ic_driver,
&dc_lb_driver,
&dc_pe_driver,
&dc_tc_driver,
diff --git a/drivers/gpu/drm/imx/dc/dc-drv.h b/drivers/gpu/drm/imx/dc/dc-drv.h
index c687a36b8153..3b11f4862c6c 100644
--- a/drivers/gpu/drm/imx/dc/dc-drv.h
+++ b/drivers/gpu/drm/imx/dc/dc-drv.h
@@ -25,6 +25,7 @@ extern struct platform_driver dc_de_driver;
extern struct platform_driver dc_fg_driver;
extern struct platform_driver dc_fl_driver;
extern struct platform_driver dc_fw_driver;
+extern struct platform_driver dc_ic_driver;
extern struct platform_driver dc_lb_driver;
extern struct platform_driver dc_pe_driver;
extern struct platform_driver dc_tc_driver;
diff --git a/drivers/gpu/drm/imx/dc/dc-ic.c b/drivers/gpu/drm/imx/dc/dc-ic.c
new file mode 100644
index 000000000000..f022f0374772
--- /dev/null
+++ b/drivers/gpu/drm/imx/dc/dc-ic.c
@@ -0,0 +1,279 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright 2024 NXP
+ */
+
+#include <linux/clk.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/irqchip/chained_irq.h>
+#include <linux/irqdomain.h>
+#include <linux/of.h>
+#include <linux/of_irq.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/regmap.h>
+
+#define USERINTERRUPTMASK(n) (0x8 + 4 * (n))
+#define INTERRUPTENABLE(n) (0x10 + 4 * (n))
+#define INTERRUPTPRESET(n) (0x18 + 4 * (n))
+#define INTERRUPTCLEAR(n) (0x20 + 4 * (n))
+#define INTERRUPTSTATUS(n) (0x28 + 4 * (n))
+#define USERINTERRUPTENABLE(n) (0x40 + 4 * (n))
+#define USERINTERRUPTPRESET(n) (0x48 + 4 * (n))
+#define USERINTERRUPTCLEAR(n) (0x50 + 4 * (n))
+#define USERINTERRUPTSTATUS(n) (0x58 + 4 * (n))
+
+#define IRQ_COUNT 49
+#define IRQ_RESERVED 35
+#define REG_NUM 2
+
+struct dc_ic_data {
+ struct regmap *regs;
+ struct clk *clk_axi;
+ int irq[IRQ_COUNT];
+ struct irq_domain *domain;
+};
+
+struct dc_ic_entry {
+ struct dc_ic_data *data;
+ int irq;
+};
+
+static const struct regmap_range dc_ic_regmap_write_ranges[] = {
+ regmap_reg_range(USERINTERRUPTMASK(0), INTERRUPTCLEAR(1)),
+ regmap_reg_range(USERINTERRUPTENABLE(0), USERINTERRUPTCLEAR(1)),
+};
+
+static const struct regmap_access_table dc_ic_regmap_write_table = {
+ .yes_ranges = dc_ic_regmap_write_ranges,
+ .n_yes_ranges = ARRAY_SIZE(dc_ic_regmap_write_ranges),
+};
+
+static const struct regmap_range dc_ic_regmap_read_ranges[] = {
+ regmap_reg_range(USERINTERRUPTMASK(0), USERINTERRUPTSTATUS(1)),
+};
+
+static const struct regmap_access_table dc_ic_regmap_read_table = {
+ .yes_ranges = dc_ic_regmap_read_ranges,
+ .n_yes_ranges = ARRAY_SIZE(dc_ic_regmap_read_ranges),
+};
+
+static const struct regmap_range dc_ic_regmap_volatile_ranges[] = {
+ regmap_reg_range(INTERRUPTPRESET(0), INTERRUPTCLEAR(1)),
+ regmap_reg_range(USERINTERRUPTPRESET(0), USERINTERRUPTCLEAR(1)),
+};
+
+static const struct regmap_access_table dc_ic_regmap_volatile_table = {
+ .yes_ranges = dc_ic_regmap_volatile_ranges,
+ .n_yes_ranges = ARRAY_SIZE(dc_ic_regmap_volatile_ranges),
+};
+
+static const struct regmap_config dc_ic_regmap_config = {
+ .name = "interrupt-controller",
+ .reg_bits = 32,
+ .reg_stride = 4,
+ .val_bits = 32,
+ .fast_io = true,
+ .wr_table = &dc_ic_regmap_write_table,
+ .rd_table = &dc_ic_regmap_read_table,
+ .volatile_table = &dc_ic_regmap_volatile_table,
+};
+
+static void dc_ic_irq_handler(struct irq_desc *desc)
+{
+ struct dc_ic_entry *entry = irq_desc_get_handler_data(desc);
+ struct dc_ic_data *data = entry->data;
+ unsigned int status, enable;
+ unsigned int virq;
+
+ chained_irq_enter(irq_desc_get_chip(desc), desc);
+
+ regmap_read(data->regs, USERINTERRUPTSTATUS(entry->irq / 32), &status);
+ regmap_read(data->regs, USERINTERRUPTENABLE(entry->irq / 32), &enable);
+
+ status &= enable;
+
+ if (status & BIT(entry->irq % 32)) {
+ virq = irq_linear_revmap(data->domain, entry->irq);
+ if (virq)
+ generic_handle_irq(virq);
+ }
+
+ chained_irq_exit(irq_desc_get_chip(desc), desc);
+}
+
+static const unsigned long unused_irq[REG_NUM] = {0x00000000, 0xfffe0008};
+
+static int dc_ic_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct irq_chip_generic *gc;
+ struct dc_ic_entry *entry;
+ struct irq_chip_type *ct;
+ struct dc_ic_data *data;
+ void __iomem *base;
+ int i, ret;
+
+ data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ entry = devm_kcalloc(dev, IRQ_COUNT, sizeof(*entry), GFP_KERNEL);
+ if (!entry)
+ return -ENOMEM;
+
+ base = devm_platform_ioremap_resource(pdev, 0);
+ if (IS_ERR(base)) {
+ dev_err(dev, "failed to initialize reg\n");
+ return PTR_ERR(base);
+ }
+
+ data->regs = devm_regmap_init_mmio(dev, base, &dc_ic_regmap_config);
+ if (IS_ERR(data->regs))
+ return PTR_ERR(data->regs);
+
+ data->clk_axi = devm_clk_get(dev, NULL);
+ if (IS_ERR(data->clk_axi))
+ return dev_err_probe(dev, PTR_ERR(data->clk_axi),
+ "failed to get AXI clock\n");
+
+ for (i = 0; i < IRQ_COUNT; i++) {
+ /* skip the reserved IRQ */
+ if (i == IRQ_RESERVED)
+ continue;
+
+ ret = platform_get_irq(pdev, i);
+ if (ret < 0)
+ return ret;
+ }
+
+ dev_set_drvdata(dev, data);
+
+ ret = devm_pm_runtime_enable(dev);
+ if (ret)
+ return ret;
+
+ ret = pm_runtime_resume_and_get(dev);
+ if (ret < 0) {
+ dev_err(dev, "failed to get runtime PM sync: %d\n", ret);
+ return ret;
+ }
+
+ for (i = 0; i < REG_NUM; i++) {
+ /* mask and clear all interrupts */
+ regmap_write(data->regs, USERINTERRUPTENABLE(i), 0x0);
+ regmap_write(data->regs, INTERRUPTENABLE(i), 0x0);
+ regmap_write(data->regs, USERINTERRUPTCLEAR(i), 0xffffffff);
+ regmap_write(data->regs, INTERRUPTCLEAR(i), 0xffffffff);
+
+ /* set all interrupts to user mode */
+ regmap_write(data->regs, USERINTERRUPTMASK(i), 0xffffffff);
+ }
+
+ data->domain = irq_domain_add_linear(dev->of_node, IRQ_COUNT,
+ &irq_generic_chip_ops, data);
+ if (!data->domain) {
+ dev_err(dev, "failed to create IRQ domain\n");
+ pm_runtime_put(dev);
+ return -ENOMEM;
+ }
+ irq_domain_set_pm_device(data->domain, dev);
+
+ ret = irq_alloc_domain_generic_chips(data->domain, 32, 1, "DC",
+ handle_level_irq, 0, 0, 0);
+ if (ret) {
+ dev_err(dev, "failed to alloc generic IRQ chips: %d\n", ret);
+ irq_domain_remove(data->domain);
+ pm_runtime_put(dev);
+ return ret;
+ }
+
+ for (i = 0; i < IRQ_COUNT; i += 32) {
+ gc = irq_get_domain_generic_chip(data->domain, i);
+ gc->reg_base = base;
+ gc->unused = unused_irq[i / 32];
+ ct = gc->chip_types;
+ ct->chip.irq_ack = irq_gc_ack_set_bit;
+ ct->chip.irq_mask = irq_gc_mask_clr_bit;
+ ct->chip.irq_unmask = irq_gc_mask_set_bit;
+ ct->regs.ack = USERINTERRUPTCLEAR(i / 32);
+ ct->regs.mask = USERINTERRUPTENABLE(i / 32);
+ }
+
+ for (i = 0; i < IRQ_COUNT; i++) {
+ /* skip the reserved IRQ */
+ if (i == IRQ_RESERVED)
+ continue;
+
+ data->irq[i] = irq_of_parse_and_map(dev->of_node, i);
+
+ entry[i].data = data;
+ entry[i].irq = i;
+
+ irq_set_chained_handler_and_data(data->irq[i],
+ dc_ic_irq_handler, &entry[i]);
+ }
+
+ return 0;
+}
+
+static void dc_ic_remove(struct platform_device *pdev)
+{
+ struct dc_ic_data *data = dev_get_drvdata(&pdev->dev);
+ int i;
+
+ for (i = 0; i < IRQ_COUNT; i++) {
+ if (i == IRQ_RESERVED)
+ continue;
+
+ irq_set_chained_handler_and_data(data->irq[i], NULL, NULL);
+ }
+
+ irq_domain_remove(data->domain);
+
+ pm_runtime_put_sync(&pdev->dev);
+}
+
+static int dc_ic_runtime_suspend(struct device *dev)
+{
+ struct dc_ic_data *data = dev_get_drvdata(dev);
+
+ clk_disable_unprepare(data->clk_axi);
+
+ return 0;
+}
+
+static int dc_ic_runtime_resume(struct device *dev)
+{
+ struct dc_ic_data *data = dev_get_drvdata(dev);
+ int ret;
+
+ ret = clk_prepare_enable(data->clk_axi);
+ if (ret)
+ dev_err(dev, "failed to enable AXI clock: %d\n", ret);
+
+ return ret;
+}
+
+static const struct dev_pm_ops dc_ic_pm_ops = {
+ SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
+ pm_runtime_force_resume)
+ RUNTIME_PM_OPS(dc_ic_runtime_suspend, dc_ic_runtime_resume, NULL)
+};
+
+static const struct of_device_id dc_ic_dt_ids[] = {
+ { .compatible = "fsl,imx8qxp-dc-intc", },
+ { /* sentinel */ }
+};
+
+struct platform_driver dc_ic_driver = {
+ .probe = dc_ic_probe,
+ .remove = dc_ic_remove,
+ .driver = {
+ .name = "imx8-dc-intc",
+ .suppress_bind_attrs = true,
+ .of_match_table = dc_ic_dt_ids,
+ .pm = pm_sleep_ptr(&dc_ic_pm_ops),
+ },
+};
--
2.34.1
