--- /dev/null
+// SPDX-License-Identifier: GPL-2.0 OR MIT
+/*
+ * Copyright (C) 2023-2025 SpacemiT (Hangzhou) Technology Co. Ltd
+ * Copyright (C) 2025 Yixun Lan <dlan@gentoo.org>
+ */
+
+#include <linux/clk.h>
+#include <linux/gpio/driver.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/irq.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/seq_file.h>
+
+/* register offset */
+#define SPACEMIT_GPLR 0x00 /* port level - R */
+#define SPACEMIT_GPDR 0x0c /* port direction - R/W */
+#define SPACEMIT_GPSR 0x18 /* port set - W */
+#define SPACEMIT_GPCR 0x24 /* port clear - W */
+#define SPACEMIT_GRER 0x30 /* port rising edge R/W */
+#define SPACEMIT_GFER 0x3c /* port falling edge R/W */
+#define SPACEMIT_GEDR 0x48 /* edge detect status - R/W1C */
+#define SPACEMIT_GSDR 0x54 /* (set) direction - W */
+#define SPACEMIT_GCDR 0x60 /* (clear) direction - W */
+#define SPACEMIT_GSRER 0x6c /* (set) rising edge detect enable - W */
+#define SPACEMIT_GCRER 0x78 /* (clear) rising edge detect enable - W */
+#define SPACEMIT_GSFER 0x84 /* (set) falling edge detect enable - W */
+#define SPACEMIT_GCFER 0x90 /* (clear) falling edge detect enable - W */
+#define SPACEMIT_GAPMASK 0x9c /* interrupt mask , 0 disable, 1 enable - R/W */
+
+#define SPACEMIT_NR_BANKS 4
+#define SPACEMIT_NR_GPIOS_PER_BANK 32
+
+#define to_spacemit_gpio_bank(x) container_of((x), struct spacemit_gpio_bank, gc)
+
+struct spacemit_gpio;
+
+struct spacemit_gpio_bank {
+ struct gpio_chip gc;
+ struct spacemit_gpio *sg;
+ void __iomem *base;
+ u32 irq_mask;
+ u32 irq_rising_edge;
+ u32 irq_falling_edge;
+};
+
+struct spacemit_gpio {
+ struct device *dev;
+ struct spacemit_gpio_bank sgb[SPACEMIT_NR_BANKS];
+};
+
+static u32 spacemit_gpio_bank_index(struct spacemit_gpio_bank *gb)
+{
+ return (u32)(gb - gb->sg->sgb);
+}
+
+static irqreturn_t spacemit_gpio_irq_handler(int irq, void *dev_id)
+{
+ struct spacemit_gpio_bank *gb = dev_id;
+ unsigned long pending;
+ u32 n, gedr;
+
+ gedr = readl(gb->base + SPACEMIT_GEDR);
+ if (!gedr)
+ return IRQ_NONE;
+ writel(gedr, gb->base + SPACEMIT_GEDR);
+
+ pending = gedr & gb->irq_mask;
+ if (!pending)
+ return IRQ_NONE;
+
+ for_each_set_bit(n, &pending, BITS_PER_LONG)
+ handle_nested_irq(irq_find_mapping(gb->gc.irq.domain, n));
+
+ return IRQ_HANDLED;
+}
+
+static void spacemit_gpio_irq_ack(struct irq_data *d)
+{
+ struct spacemit_gpio_bank *gb = irq_data_get_irq_chip_data(d);
+
+ writel(BIT(irqd_to_hwirq(d)), gb->base + SPACEMIT_GEDR);
+}
+
+static void spacemit_gpio_irq_mask(struct irq_data *d)
+{
+ struct spacemit_gpio_bank *gb = irq_data_get_irq_chip_data(d);
+ u32 bit = BIT(irqd_to_hwirq(d));
+
+ gb->irq_mask &= ~bit;
+ writel(gb->irq_mask, gb->base + SPACEMIT_GAPMASK);
+
+ if (bit & gb->irq_rising_edge)
+ writel(bit, gb->base + SPACEMIT_GCRER);
+
+ if (bit & gb->irq_falling_edge)
+ writel(bit, gb->base + SPACEMIT_GCFER);
+}
+
+static void spacemit_gpio_irq_unmask(struct irq_data *d)
+{
+ struct spacemit_gpio_bank *gb = irq_data_get_irq_chip_data(d);
+ u32 bit = BIT(irqd_to_hwirq(d));
+
+ gb->irq_mask |= bit;
+
+ if (bit & gb->irq_rising_edge)
+ writel(bit, gb->base + SPACEMIT_GSRER);
+
+ if (bit & gb->irq_falling_edge)
+ writel(bit, gb->base + SPACEMIT_GSFER);
+
+ writel(gb->irq_mask, gb->base + SPACEMIT_GAPMASK);
+}
+
+static int spacemit_gpio_irq_set_type(struct irq_data *d, unsigned int type)
+{
+ struct spacemit_gpio_bank *gb = irq_data_get_irq_chip_data(d);
+ u32 bit = BIT(irqd_to_hwirq(d));
+
+ if (type & IRQ_TYPE_EDGE_RISING) {
+ gb->irq_rising_edge |= bit;
+ writel(bit, gb->base + SPACEMIT_GSRER);
+ } else {
+ gb->irq_rising_edge &= ~bit;
+ writel(bit, gb->base + SPACEMIT_GCRER);
+ }
+
+ if (type & IRQ_TYPE_EDGE_FALLING) {
+ gb->irq_falling_edge |= bit;
+ writel(bit, gb->base + SPACEMIT_GSFER);
+ } else {
+ gb->irq_falling_edge &= ~bit;
+ writel(bit, gb->base + SPACEMIT_GCFER);
+ }
+
+ return 0;
+}
+
+static void spacemit_gpio_irq_print_chip(struct irq_data *data, struct seq_file *p)
+{
+ struct spacemit_gpio_bank *gb = irq_data_get_irq_chip_data(data);
+
+ seq_printf(p, "%s-%d", dev_name(gb->gc.parent), spacemit_gpio_bank_index(gb));
+}
+
+static struct irq_chip spacemit_gpio_chip = {
+ .name = "k1-gpio-irqchip",
+ .irq_ack = spacemit_gpio_irq_ack,
+ .irq_mask = spacemit_gpio_irq_mask,
+ .irq_unmask = spacemit_gpio_irq_unmask,
+ .irq_set_type = spacemit_gpio_irq_set_type,
+ .irq_print_chip = spacemit_gpio_irq_print_chip,
+ .flags = IRQCHIP_IMMUTABLE | IRQCHIP_SKIP_SET_WAKE,
+ GPIOCHIP_IRQ_RESOURCE_HELPERS,
+};
+
+static bool spacemit_of_node_instance_match(struct gpio_chip *gc, unsigned int i)
+{
+ struct spacemit_gpio_bank *gb = gpiochip_get_data(gc);
+ struct spacemit_gpio *sg = gb->sg;
+
+ if (i >= SPACEMIT_NR_BANKS)
+ return false;
+
+ return (gc == &sg->sgb[i].gc);
+}
+
+static int spacemit_gpio_add_bank(struct spacemit_gpio *sg,
+ void __iomem *regs,
+ int index, int irq)
+{
+ struct spacemit_gpio_bank *gb = &sg->sgb[index];
+ struct gpio_chip *gc = &gb->gc;
+ struct device *dev = sg->dev;
+ struct gpio_irq_chip *girq;
+ void __iomem *dat, *set, *clr, *dirin, *dirout;
+ int ret, bank_base[] = { 0x0, 0x4, 0x8, 0x100 };
+
+ gb->base = regs + bank_base[index];
+
+ dat = gb->base + SPACEMIT_GPLR;
+ set = gb->base + SPACEMIT_GPSR;
+ clr = gb->base + SPACEMIT_GPCR;
+ dirin = gb->base + SPACEMIT_GCDR;
+ dirout = gb->base + SPACEMIT_GSDR;
+
+ /* This registers 32 GPIO lines per bank */
+ ret = bgpio_init(gc, dev, 4, dat, set, clr, dirout, dirin,
+ BGPIOF_UNREADABLE_REG_SET | BGPIOF_UNREADABLE_REG_DIR);
+ if (ret)
+ return dev_err_probe(dev, ret, "failed to init gpio chip\n");
+
+ gb->sg = sg;
+
+ gc->label = dev_name(dev);
+ gc->request = gpiochip_generic_request;
+ gc->free = gpiochip_generic_free;
+ gc->ngpio = SPACEMIT_NR_GPIOS_PER_BANK;
+ gc->base = -1;
+ gc->of_gpio_n_cells = 3;
+ gc->of_node_instance_match = spacemit_of_node_instance_match;
+
+ girq = &gc->irq;
+ girq->threaded = true;
+ girq->handler = handle_simple_irq;
+
+ gpio_irq_chip_set_chip(girq, &spacemit_gpio_chip);
+
+ /* Disable Interrupt */
+ writel(0, gb->base + SPACEMIT_GAPMASK);
+ /* Disable Edge Detection Settings */
+ writel(0x0, gb->base + SPACEMIT_GRER);
+ writel(0x0, gb->base + SPACEMIT_GFER);
+ /* Clear Interrupt */
+ writel(0xffffffff, gb->base + SPACEMIT_GCRER);
+ writel(0xffffffff, gb->base + SPACEMIT_GCFER);
+
+ ret = devm_request_threaded_irq(dev, irq, NULL,
+ spacemit_gpio_irq_handler,
+ IRQF_ONESHOT | IRQF_SHARED,
+ gb->gc.label, gb);
+ if (ret < 0)
+ return dev_err_probe(dev, ret, "failed to register IRQ\n");
+
+ ret = devm_gpiochip_add_data(dev, gc, gb);
+ if (ret)
+ return ret;
+
+ /* Distuingish IRQ domain, for selecting threecells mode */
+ irq_domain_update_bus_token(girq->domain, DOMAIN_BUS_WIRED);
+
+ return 0;
+}
+
+static int spacemit_gpio_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct spacemit_gpio *sg;
+ struct clk *core_clk, *bus_clk;
+ void __iomem *regs;
+ int i, irq, ret;
+
+ sg = devm_kzalloc(dev, sizeof(*sg), GFP_KERNEL);
+ if (!sg)
+ return -ENOMEM;
+
+ regs = devm_platform_ioremap_resource(pdev, 0);
+ if (IS_ERR(regs))
+ return PTR_ERR(regs);
+
+ irq = platform_get_irq(pdev, 0);
+ if (irq < 0)
+ return irq;
+
+ sg->dev = dev;
+
+ core_clk = devm_clk_get_enabled(dev, "core");
+ if (IS_ERR(core_clk))
+ return dev_err_probe(dev, PTR_ERR(core_clk), "failed to get clock\n");
+
+ bus_clk = devm_clk_get_enabled(dev, "bus");
+ if (IS_ERR(bus_clk))
+ return dev_err_probe(dev, PTR_ERR(bus_clk), "failed to get bus clock\n");
+
+ for (i = 0; i < SPACEMIT_NR_BANKS; i++) {
+ ret = spacemit_gpio_add_bank(sg, regs, i, irq);
+ if (ret)
+ return ret;
+ }
+
+ return 0;
+}
+
+static const struct of_device_id spacemit_gpio_dt_ids[] = {
+ { .compatible = "spacemit,k1-gpio" },
+ { /* sentinel */ }
+};
+
+static struct platform_driver spacemit_gpio_driver = {
+ .probe = spacemit_gpio_probe,
+ .driver = {
+ .name = "k1-gpio",
+ .of_match_table = spacemit_gpio_dt_ids,
+ },
+};
+module_platform_driver(spacemit_gpio_driver);
+
+MODULE_AUTHOR("Yixun Lan <dlan@gentoo.org>");
+MODULE_DESCRIPTION("GPIO driver for SpacemiT K1 SoC");
+MODULE_LICENSE("GPL");
projects / linux-block.git / commitdiff