--- /dev/null
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright 2015 IBM Corp.
+ * Joel Stanley <joel@jms.id.au>
+ * Ryan Chen <ryan_chen@aspeedtech.com>
+ *
+ * Implementation extracted from the Linux kernel and adapted for u-boot.
+ */
+#include <common.h>
+#include <asm/io.h>
+#include <asm/gpio.h>
+
+#include <config.h>
+#include <common.h>
+#include <clk.h>
+#include <dm.h>
+#include <asm/io.h>
+#include <linux/bug.h>
+#include <linux/sizes.h>
+
+struct aspeed_gpio_priv {
+ void *regs;
+};
+
+struct aspeed_gpio_bank {
+ u16 val_regs; /* +0: Rd: read input value, Wr: set write latch
+ * +4: Rd/Wr: Direction (0=in, 1=out)
+ */
+ u16 rdata_reg; /* Rd: read write latch, Wr: <none> */
+ u16 irq_regs;
+ u16 debounce_regs;
+ u16 tolerance_regs;
+ u16 cmdsrc_regs;
+ const char names[4][3];
+};
+
+static const struct aspeed_gpio_bank aspeed_gpio_banks[] = {
+ {
+ .val_regs = 0x0000,
+ .rdata_reg = 0x00c0,
+ .irq_regs = 0x0008,
+ .debounce_regs = 0x0040,
+ .tolerance_regs = 0x001c,
+ .cmdsrc_regs = 0x0060,
+ .names = { "A", "B", "C", "D" },
+ },
+ {
+ .val_regs = 0x0020,
+ .rdata_reg = 0x00c4,
+ .irq_regs = 0x0028,
+ .debounce_regs = 0x0048,
+ .tolerance_regs = 0x003c,
+ .cmdsrc_regs = 0x0068,
+ .names = { "E", "F", "G", "H" },
+ },
+ {
+ .val_regs = 0x0070,
+ .rdata_reg = 0x00c8,
+ .irq_regs = 0x0098,
+ .debounce_regs = 0x00b0,
+ .tolerance_regs = 0x00ac,
+ .cmdsrc_regs = 0x0090,
+ .names = { "I", "J", "K", "L" },
+ },
+ {
+ .val_regs = 0x0078,
+ .rdata_reg = 0x00cc,
+ .irq_regs = 0x00e8,
+ .debounce_regs = 0x0100,
+ .tolerance_regs = 0x00fc,
+ .cmdsrc_regs = 0x00e0,
+ .names = { "M", "N", "O", "P" },
+ },
+ {
+ .val_regs = 0x0080,
+ .rdata_reg = 0x00d0,
+ .irq_regs = 0x0118,
+ .debounce_regs = 0x0130,
+ .tolerance_regs = 0x012c,
+ .cmdsrc_regs = 0x0110,
+ .names = { "Q", "R", "S", "T" },
+ },
+ {
+ .val_regs = 0x0088,
+ .rdata_reg = 0x00d4,
+ .irq_regs = 0x0148,
+ .debounce_regs = 0x0160,
+ .tolerance_regs = 0x015c,
+ .cmdsrc_regs = 0x0140,
+ .names = { "U", "V", "W", "X" },
+ },
+ {
+ .val_regs = 0x01E0,
+ .rdata_reg = 0x00d8,
+ .irq_regs = 0x0178,
+ .debounce_regs = 0x0190,
+ .tolerance_regs = 0x018c,
+ .cmdsrc_regs = 0x0170,
+ .names = { "Y", "Z", "AA", "AB" },
+ },
+ {
+ .val_regs = 0x01e8,
+ .rdata_reg = 0x00dc,
+ .irq_regs = 0x01a8,
+ .debounce_regs = 0x01c0,
+ .tolerance_regs = 0x01bc,
+ .cmdsrc_regs = 0x01a0,
+ .names = { "AC", "", "", "" },
+ },
+};
+
+enum aspeed_gpio_reg {
+ reg_val,
+ reg_rdata,
+ reg_dir,
+ reg_irq_enable,
+ reg_irq_type0,
+ reg_irq_type1,
+ reg_irq_type2,
+ reg_irq_status,
+ reg_debounce_sel1,
+ reg_debounce_sel2,
+ reg_tolerance,
+ reg_cmdsrc0,
+ reg_cmdsrc1,
+};
+
+#define GPIO_VAL_VALUE 0x00
+#define GPIO_VAL_DIR 0x04
+
+#define GPIO_IRQ_ENABLE 0x00
+#define GPIO_IRQ_TYPE0 0x04
+#define GPIO_IRQ_TYPE1 0x08
+#define GPIO_IRQ_TYPE2 0x0c
+#define GPIO_IRQ_STATUS 0x10
+
+#define GPIO_DEBOUNCE_SEL1 0x00
+#define GPIO_DEBOUNCE_SEL2 0x04
+
+#define GPIO_CMDSRC_0 0x00
+#define GPIO_CMDSRC_1 0x04
+#define GPIO_CMDSRC_ARM 0
+#define GPIO_CMDSRC_LPC 1
+#define GPIO_CMDSRC_COLDFIRE 2
+#define GPIO_CMDSRC_RESERVED 3
+
+/* This will be resolved at compile time */
+static inline void __iomem *bank_reg(struct aspeed_gpio_priv *gpio,
+ const struct aspeed_gpio_bank *bank,
+ const enum aspeed_gpio_reg reg)
+{
+ switch (reg) {
+ case reg_val:
+ return gpio->regs + bank->val_regs + GPIO_VAL_VALUE;
+ case reg_rdata:
+ return gpio->regs + bank->rdata_reg;
+ case reg_dir:
+ return gpio->regs + bank->val_regs + GPIO_VAL_DIR;
+ case reg_irq_enable:
+ return gpio->regs + bank->irq_regs + GPIO_IRQ_ENABLE;
+ case reg_irq_type0:
+ return gpio->regs + bank->irq_regs + GPIO_IRQ_TYPE0;
+ case reg_irq_type1:
+ return gpio->regs + bank->irq_regs + GPIO_IRQ_TYPE1;
+ case reg_irq_type2:
+ return gpio->regs + bank->irq_regs + GPIO_IRQ_TYPE2;
+ case reg_irq_status:
+ return gpio->regs + bank->irq_regs + GPIO_IRQ_STATUS;
+ case reg_debounce_sel1:
+ return gpio->regs + bank->debounce_regs + GPIO_DEBOUNCE_SEL1;
+ case reg_debounce_sel2:
+ return gpio->regs + bank->debounce_regs + GPIO_DEBOUNCE_SEL2;
+ case reg_tolerance:
+ return gpio->regs + bank->tolerance_regs;
+ case reg_cmdsrc0:
+ return gpio->regs + bank->cmdsrc_regs + GPIO_CMDSRC_0;
+ case reg_cmdsrc1:
+ return gpio->regs + bank->cmdsrc_regs + GPIO_CMDSRC_1;
+ }
+ BUG();
+}
+
+#define GPIO_BANK(x) ((x) >> 5)
+#define GPIO_OFFSET(x) ((x) & 0x1f)
+#define GPIO_BIT(x) BIT(GPIO_OFFSET(x))
+
+static const struct aspeed_gpio_bank *to_bank(unsigned int offset)
+{
+ unsigned int bank = GPIO_BANK(offset);
+
+ WARN_ON(bank >= ARRAY_SIZE(aspeed_gpio_banks));
+ return &aspeed_gpio_banks[bank];
+}
+
+static int
+aspeed_gpio_direction_input(struct udevice *dev, unsigned int offset)
+{
+ struct aspeed_gpio_priv *priv = dev_get_priv(dev);
+ const struct aspeed_gpio_bank *bank = to_bank(offset);
+ u32 dir = readl(bank_reg(priv, bank, reg_dir));
+
+ dir &= ~GPIO_BIT(offset);
+ writel(dir, bank_reg(priv, bank, reg_dir));
+
+ return 0;
+}
+
+static int aspeed_gpio_direction_output(struct udevice *dev, unsigned int offset,
+ int value)
+{
+ struct aspeed_gpio_priv *priv = dev_get_priv(dev);
+ const struct aspeed_gpio_bank *bank = to_bank(offset);
+ u32 dir = readl(bank_reg(priv, bank, reg_dir));
+ u32 output = readl(bank_reg(priv, bank, reg_val));
+
+ dir |= GPIO_BIT(offset);
+ writel(dir, bank_reg(priv, bank, reg_dir));
+
+ if (value)
+ output |= GPIO_BIT(offset);
+ else
+ output &= ~GPIO_BIT(offset);
+
+ writel(output, bank_reg(priv, bank, reg_val));
+
+ return 0;
+}
+
+static int aspeed_gpio_get_value(struct udevice *dev, unsigned int offset)
+{
+ struct aspeed_gpio_priv *priv = dev_get_priv(dev);
+ const struct aspeed_gpio_bank *bank = to_bank(offset);
+
+ return !!(readl(bank_reg(priv, bank, reg_val)) & GPIO_BIT(offset));
+}
+
+static int
+aspeed_gpio_set_value(struct udevice *dev, unsigned int offset, int value)
+{
+ struct aspeed_gpio_priv *priv = dev_get_priv(dev);
+ const struct aspeed_gpio_bank *bank = to_bank(offset);
+ u32 data = readl(bank_reg(priv, bank, reg_val));
+
+ if (value)
+ data |= GPIO_BIT(offset);
+ else
+ data &= ~GPIO_BIT(offset);
+
+ writel(data, bank_reg(priv, bank, reg_val));
+
+ return 0;
+}
+
+static int aspeed_gpio_get_function(struct udevice *dev, unsigned int offset)
+{
+ struct aspeed_gpio_priv *priv = dev_get_priv(dev);
+ const struct aspeed_gpio_bank *bank = to_bank(offset);
+
+ if (readl(bank_reg(priv, bank, reg_dir)) & GPIO_BIT(offset))
+ return GPIOF_OUTPUT;
+
+ return GPIOF_INPUT;
+}
+
+static const struct dm_gpio_ops aspeed_gpio_ops = {
+ .direction_input = aspeed_gpio_direction_input,
+ .direction_output = aspeed_gpio_direction_output,
+ .get_value = aspeed_gpio_get_value,
+ .set_value = aspeed_gpio_set_value,
+ .get_function = aspeed_gpio_get_function,
+};
+
+static int aspeed_gpio_probe(struct udevice *dev)
+{
+ struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
+ struct aspeed_gpio_priv *priv = dev_get_priv(dev);
+
+ uc_priv->bank_name = dev->name;
+ ofnode_read_u32(dev_ofnode(dev), "ngpios", &uc_priv->gpio_count);
+ priv->regs = devfdt_get_addr_ptr(dev);
+
+ return 0;
+}
+
+static const struct udevice_id aspeed_gpio_ids[] = {
+ { .compatible = "aspeed,ast2400-gpio", },
+ { .compatible = "aspeed,ast2500-gpio", },
+ { .compatible = "aspeed,ast2600-gpio", },
+ { }
+};
+
+U_BOOT_DRIVER(gpio_aspeed) = {
+ .name = "gpio-aspeed",
+ .id = UCLASS_GPIO,
+ .of_match = aspeed_gpio_ids,
+ .ops = &aspeed_gpio_ops,
+ .probe = aspeed_gpio_probe,
+ .priv_auto = sizeof(struct aspeed_gpio_priv),
+};
projects / platform / kernel / u-boot.git / commitdiff