--- /dev/null
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2018 Marvell International Ltd.
+ *
+ * (C) Copyright 2011
+ * eInfochips Ltd. <www.einfochips.com>
+ * Written-by: Ajay Bhargav <ajay.bhargav@einfochips.com>
+ *
+ * (C) Copyright 2010
+ * Marvell Semiconductor <www.marvell.com>
+ */
+
+#include <dm.h>
+#include <pci.h>
+#include <pci_ids.h>
+#include <asm/gpio.h>
+#include <asm/io.h>
+#include <linux/bitfield.h>
+#include <linux/compat.h>
+#include <dt-bindings/gpio/gpio.h>
+
+/* Returns the bit value to write or read based on the offset */
+#define GPIO_BIT(x) BIT_ULL((x) & 0x3f)
+
+#define GPIO_RX_DAT 0x00
+#define GPIO_TX_SET 0x08
+#define GPIO_TX_CLR 0x10
+#define GPIO_CONST 0x90 /* OcteonTX only */
+
+/* Offset to register-set for 2nd GPIOs (> 63), OcteonTX only */
+#define GPIO1_OFFSET 0x1400
+
+/* GPIO_CONST register bits */
+#define GPIO_CONST_GPIOS_MASK GENMASK_ULL(7, 0)
+
+/* GPIO_BIT_CFG register bits */
+#define GPIO_BIT_CFG_TX_OE BIT_ULL(0)
+#define GPIO_BIT_CFG_PIN_XOR BIT_ULL(1)
+#define GPIO_BIT_CFG_INT_EN BIT_ULL(2)
+#define GPIO_BIT_CFG_PIN_SEL_MASK GENMASK_ULL(26, 16)
+
+enum {
+ PROBE_PCI = 0, /* PCI based probing */
+ PROBE_DT, /* DT based probing */
+};
+
+struct octeon_gpio_data {
+ int probe;
+ u32 reg_offs;
+ u32 gpio_bit_cfg_offs;
+};
+
+struct octeon_gpio {
+ void __iomem *base;
+ const struct octeon_gpio_data *data;
+};
+
+/* Returns the offset to the output register based on the offset and value */
+static u32 gpio_tx_reg(int offset, int value)
+{
+ u32 ret;
+
+ ret = value ? GPIO_TX_SET : GPIO_TX_CLR;
+ if (offset > 63)
+ ret += GPIO1_OFFSET;
+
+ return ret;
+}
+
+/* Returns the offset to the input data register based on the offset */
+static u32 gpio_rx_dat_reg(int offset)
+{
+ u32 ret;
+
+ ret = GPIO_RX_DAT;
+ if (offset > 63)
+ ret += GPIO1_OFFSET;
+
+ return ret;
+}
+
+static int octeon_gpio_dir_input(struct udevice *dev, unsigned int offset)
+{
+ struct octeon_gpio *gpio = dev_get_priv(dev);
+
+ debug("%s(%s, %u)\n", __func__, dev->name, offset);
+ clrbits_64(gpio->base + gpio->data->gpio_bit_cfg_offs + 8 * offset,
+ GPIO_BIT_CFG_TX_OE | GPIO_BIT_CFG_PIN_XOR |
+ GPIO_BIT_CFG_INT_EN | GPIO_BIT_CFG_PIN_SEL_MASK);
+
+ return 0;
+}
+
+static int octeon_gpio_dir_output(struct udevice *dev, unsigned int offset,
+ int value)
+{
+ struct octeon_gpio *gpio = dev_get_priv(dev);
+
+ debug("%s(%s, %u, %d)\n", __func__, dev->name, offset, value);
+ writeq(GPIO_BIT(offset), gpio->base + gpio->data->reg_offs +
+ gpio_tx_reg(offset, value));
+
+ clrsetbits_64(gpio->base + gpio->data->gpio_bit_cfg_offs + 8 * offset,
+ GPIO_BIT_CFG_PIN_SEL_MASK | GPIO_BIT_CFG_INT_EN,
+ GPIO_BIT_CFG_TX_OE);
+
+ return 0;
+}
+
+static int octeon_gpio_get_value(struct udevice *dev, unsigned int offset)
+{
+ struct octeon_gpio *gpio = dev_get_priv(dev);
+ u64 reg = readq(gpio->base + gpio->data->reg_offs +
+ gpio_rx_dat_reg(offset));
+
+ debug("%s(%s, %u): value: %d\n", __func__, dev->name, offset,
+ !!(reg & GPIO_BIT(offset)));
+
+ return !!(reg & GPIO_BIT(offset));
+}
+
+static int octeon_gpio_set_value(struct udevice *dev,
+ unsigned int offset, int value)
+{
+ struct octeon_gpio *gpio = dev_get_priv(dev);
+
+ debug("%s(%s, %u, %d)\n", __func__, dev->name, offset, value);
+ writeq(GPIO_BIT(offset), gpio->base + gpio->data->reg_offs +
+ gpio_tx_reg(offset, value));
+
+ return 0;
+}
+
+static int octeon_gpio_get_function(struct udevice *dev, unsigned int offset)
+{
+ struct octeon_gpio *gpio = dev_get_priv(dev);
+ u64 val = readq(gpio->base + gpio->data->gpio_bit_cfg_offs +
+ 8 * offset);
+ int pin_sel;
+
+ debug("%s(%s, %u): GPIO_BIT_CFG: 0x%llx\n", __func__, dev->name,
+ offset, val);
+ pin_sel = FIELD_GET(GPIO_BIT_CFG_PIN_SEL_MASK, val);
+ if (pin_sel)
+ return GPIOF_FUNC;
+ else if (val & GPIO_BIT_CFG_TX_OE)
+ return GPIOF_OUTPUT;
+ else
+ return GPIOF_INPUT;
+}
+
+static int octeon_gpio_xlate(struct udevice *dev, struct gpio_desc *desc,
+ struct ofnode_phandle_args *args)
+{
+ if (args->args_count < 1)
+ return -EINVAL;
+
+ desc->offset = args->args[0];
+ desc->flags = 0;
+ if (args->args_count > 1) {
+ if (args->args[1] & GPIO_ACTIVE_LOW)
+ desc->flags |= GPIOD_ACTIVE_LOW;
+ /* In the future add tri-state flag support */
+ }
+ return 0;
+}
+
+static const struct dm_gpio_ops octeon_gpio_ops = {
+ .direction_input = octeon_gpio_dir_input,
+ .direction_output = octeon_gpio_dir_output,
+ .get_value = octeon_gpio_get_value,
+ .set_value = octeon_gpio_set_value,
+ .get_function = octeon_gpio_get_function,
+ .xlate = octeon_gpio_xlate,
+};
+
+static int octeon_gpio_probe(struct udevice *dev)
+{
+ struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
+ struct octeon_gpio *priv = dev_get_priv(dev);
+ char *end;
+
+ priv->data = (const struct octeon_gpio_data *)dev_get_driver_data(dev);
+
+ if (priv->data->probe == PROBE_PCI) {
+ priv->base = dm_pci_map_bar(dev, PCI_BASE_ADDRESS_0,
+ PCI_REGION_MEM);
+ uc_priv->gpio_count = readq(priv->base +
+ priv->data->reg_offs + GPIO_CONST) &
+ GPIO_CONST_GPIOS_MASK;
+ } else {
+ priv->base = dev_remap_addr(dev);
+ uc_priv->gpio_count = ofnode_read_u32_default(dev->node,
+ "nr-gpios", 32);
+ }
+
+ if (!priv->base) {
+ debug("%s(%s): Could not get base address\n",
+ __func__, dev->name);
+ return -ENODEV;
+ }
+
+ uc_priv->bank_name = strdup(dev->name);
+ end = strchr(uc_priv->bank_name, '@');
+ end[0] = 'A' + dev->seq;
+ end[1] = '\0';
+
+ debug("%s(%s): base address: %p, pin count: %d\n",
+ __func__, dev->name, priv->base, uc_priv->gpio_count);
+
+ return 0;
+}
+
+static const struct octeon_gpio_data gpio_octeon_data = {
+ .probe = PROBE_DT,
+ .reg_offs = 0x80,
+ .gpio_bit_cfg_offs = 0x100,
+};
+
+static const struct octeon_gpio_data gpio_octeontx_data = {
+ .probe = PROBE_PCI,
+ .reg_offs = 0x00,
+ .gpio_bit_cfg_offs = 0x400,
+};
+
+static const struct udevice_id octeon_gpio_ids[] = {
+ { .compatible = "cavium,thunder-8890-gpio",
+ .data = (ulong)&gpio_octeontx_data },
+ { .compatible = "cavium,octeon-7890-gpio",
+ .data = (ulong)&gpio_octeon_data },
+ { }
+};
+
+U_BOOT_DRIVER(octeon_gpio) = {
+ .name = "octeon_gpio",
+ .id = UCLASS_GPIO,
+ .of_match = of_match_ptr(octeon_gpio_ids),
+ .probe = octeon_gpio_probe,
+ .priv_auto_alloc_size = sizeof(struct octeon_gpio),
+ .ops = &octeon_gpio_ops,
+ .flags = DM_FLAG_PRE_RELOC,
+};
projects / u-boot.git / commitdiff