--- /dev/null
+/* Moorestown PMIC GPIO (access through IPC) driver
+ * Copyright (c) 2008 - 2009, Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+/* Supports:
+ * Moorestown platform PMIC chip
+ */
+
+#define pr_fmt(fmt) "%s: " fmt, __func__
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/interrupt.h>
+#include <linux/delay.h>
+#include <linux/stddef.h>
+#include <linux/slab.h>
+#include <linux/ioport.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/gpio.h>
+#include <asm/intel_scu_ipc.h>
+#include <linux/device.h>
+#include <linux/intel_pmic_gpio.h>
+#include <linux/platform_device.h>
+
+#define DRIVER_NAME "pmic_gpio"
+
+/* register offset that IPC driver should use
+ * 8 GPIO + 8 GPOSW (6 controllable) + 8GPO
+ */
+enum pmic_gpio_register {
+ GPIO0 = 0xE0,
+ GPIO7 = 0xE7,
+ GPIOINT = 0xE8,
+ GPOSWCTL0 = 0xEC,
+ GPOSWCTL5 = 0xF1,
+ GPO = 0xF4,
+};
+
+/* bits definition for GPIO & GPOSW */
+#define GPIO_DRV 0x01
+#define GPIO_DIR 0x02
+#define GPIO_DIN 0x04
+#define GPIO_DOU 0x08
+#define GPIO_INTCTL 0x30
+#define GPIO_DBC 0xc0
+
+#define GPOSW_DRV 0x01
+#define GPOSW_DOU 0x08
+#define GPOSW_RDRV 0x30
+
+#define GPIO_UPDATE_TYPE 0x80000000
+
+#define NUM_GPIO 24
+
+struct pmic_gpio {
+ struct mutex buslock;
+ struct gpio_chip chip;
+ void *gpiointr;
+ int irq;
+ unsigned irq_base;
+ unsigned int update_type;
+ u32 trigger_type;
+};
+
+static void pmic_program_irqtype(int gpio, int type)
+{
+ if (type & IRQ_TYPE_EDGE_RISING)
+ intel_scu_ipc_update_register(GPIO0 + gpio, 0x20, 0x20);
+ else
+ intel_scu_ipc_update_register(GPIO0 + gpio, 0x00, 0x20);
+
+ if (type & IRQ_TYPE_EDGE_FALLING)
+ intel_scu_ipc_update_register(GPIO0 + gpio, 0x10, 0x10);
+ else
+ intel_scu_ipc_update_register(GPIO0 + gpio, 0x00, 0x10);
+};
+
+static int pmic_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
+{
+ if (offset >= 8) {
+ pr_err("only pin 0-7 support input\n");
+ return -1;/* we only have 8 GPIO can use as input */
+ }
+ return intel_scu_ipc_update_register(GPIO0 + offset,
+ GPIO_DIR, GPIO_DIR);
+}
+
+static int pmic_gpio_direction_output(struct gpio_chip *chip,
+ unsigned offset, int value)
+{
+ int rc = 0;
+
+ if (offset < 8)/* it is GPIO */
+ rc = intel_scu_ipc_update_register(GPIO0 + offset,
+ GPIO_DRV | (value ? GPIO_DOU : 0),
+ GPIO_DRV | GPIO_DOU | GPIO_DIR);
+ else if (offset < 16)/* it is GPOSW */
+ rc = intel_scu_ipc_update_register(GPOSWCTL0 + offset - 8,
+ GPOSW_DRV | (value ? GPOSW_DOU : 0),
+ GPOSW_DRV | GPOSW_DOU | GPOSW_RDRV);
+ else if (offset > 15 && offset < 24)/* it is GPO */
+ rc = intel_scu_ipc_update_register(GPO,
+ value ? 1 << (offset - 16) : 0,
+ 1 << (offset - 16));
+ else {
+ pr_err("invalid PMIC GPIO pin %d!\n", offset);
+ WARN_ON(1);
+ }
+
+ return rc;
+}
+
+static int pmic_gpio_get(struct gpio_chip *chip, unsigned offset)
+{
+ u8 r;
+ int ret;
+
+ /* we only have 8 GPIO pins we can use as input */
+ if (offset >= 8)
+ return -EOPNOTSUPP;
+ ret = intel_scu_ipc_ioread8(GPIO0 + offset, &r);
+ if (ret < 0)
+ return ret;
+ return r & GPIO_DIN;
+}
+
+static void pmic_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
+{
+ if (offset < 8)/* it is GPIO */
+ intel_scu_ipc_update_register(GPIO0 + offset,
+ GPIO_DRV | (value ? GPIO_DOU : 0),
+ GPIO_DRV | GPIO_DOU);
+ else if (offset < 16)/* it is GPOSW */
+ intel_scu_ipc_update_register(GPOSWCTL0 + offset - 8,
+ GPOSW_DRV | (value ? GPOSW_DOU : 0),
+ GPOSW_DRV | GPOSW_DOU | GPOSW_RDRV);
+ else if (offset > 15 && offset < 24) /* it is GPO */
+ intel_scu_ipc_update_register(GPO,
+ value ? 1 << (offset - 16) : 0,
+ 1 << (offset - 16));
+}
+
+/*
+ * This is called from genirq with pg->buslock locked and
+ * irq_desc->lock held. We can not access the scu bus here, so we
+ * store the change and update in the bus_sync_unlock() function below
+ */
+static int pmic_irq_type(struct irq_data *data, unsigned type)
+{
+ struct pmic_gpio *pg = irq_data_get_irq_chip_data(data);
+ u32 gpio = data->irq - pg->irq_base;
+
+ if (gpio >= pg->chip.ngpio)
+ return -EINVAL;
+
+ pg->trigger_type = type;
+ pg->update_type = gpio | GPIO_UPDATE_TYPE;
+ return 0;
+}
+
+static int pmic_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
+{
+ struct pmic_gpio *pg = container_of(chip, struct pmic_gpio, chip);
+
+ return pg->irq_base + offset;
+}
+
+static void pmic_bus_lock(struct irq_data *data)
+{
+ struct pmic_gpio *pg = irq_data_get_irq_chip_data(data);
+
+ mutex_lock(&pg->buslock);
+}
+
+static void pmic_bus_sync_unlock(struct irq_data *data)
+{
+ struct pmic_gpio *pg = irq_data_get_irq_chip_data(data);
+
+ if (pg->update_type) {
+ unsigned int gpio = pg->update_type & ~GPIO_UPDATE_TYPE;
+
+ pmic_program_irqtype(gpio, pg->trigger_type);
+ pg->update_type = 0;
+ }
+ mutex_unlock(&pg->buslock);
+}
+
+/* the gpiointr register is read-clear, so just do nothing. */
+static void pmic_irq_unmask(struct irq_data *data) { }
+
+static void pmic_irq_mask(struct irq_data *data) { }
+
+static struct irq_chip pmic_irqchip = {
+ .name = "PMIC-GPIO",
+ .irq_mask = pmic_irq_mask,
+ .irq_unmask = pmic_irq_unmask,
+ .irq_set_type = pmic_irq_type,
+ .irq_bus_lock = pmic_bus_lock,
+ .irq_bus_sync_unlock = pmic_bus_sync_unlock,
+};
+
+static irqreturn_t pmic_irq_handler(int irq, void *data)
+{
+ struct pmic_gpio *pg = data;
+ u8 intsts = *((u8 *)pg->gpiointr + 4);
+ int gpio;
+ irqreturn_t ret = IRQ_NONE;
+
+ for (gpio = 0; gpio < 8; gpio++) {
+ if (intsts & (1 << gpio)) {
+ pr_debug("pmic pin %d triggered\n", gpio);
+ generic_handle_irq(pg->irq_base + gpio);
+ ret = IRQ_HANDLED;
+ }
+ }
+ return ret;
+}
+
+static int platform_pmic_gpio_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ int irq = platform_get_irq(pdev, 0);
+ struct intel_pmic_gpio_platform_data *pdata = dev->platform_data;
+
+ struct pmic_gpio *pg;
+ int retval;
+ int i;
+
+ if (irq < 0) {
+ dev_dbg(dev, "no IRQ line\n");
+ return -EINVAL;
+ }
+
+ if (!pdata || !pdata->gpio_base || !pdata->irq_base) {
+ dev_dbg(dev, "incorrect or missing platform data\n");
+ return -EINVAL;
+ }
+
+ pg = kzalloc(sizeof(*pg), GFP_KERNEL);
+ if (!pg)
+ return -ENOMEM;
+
+ dev_set_drvdata(dev, pg);
+
+ pg->irq = irq;
+ /* setting up SRAM mapping for GPIOINT register */
+ pg->gpiointr = ioremap_nocache(pdata->gpiointr, 8);
+ if (!pg->gpiointr) {
+ pr_err("Can not map GPIOINT\n");
+ retval = -EINVAL;
+ goto err2;
+ }
+ pg->irq_base = pdata->irq_base;
+ pg->chip.label = "intel_pmic";
+ pg->chip.direction_input = pmic_gpio_direction_input;
+ pg->chip.direction_output = pmic_gpio_direction_output;
+ pg->chip.get = pmic_gpio_get;
+ pg->chip.set = pmic_gpio_set;
+ pg->chip.to_irq = pmic_gpio_to_irq;
+ pg->chip.base = pdata->gpio_base;
+ pg->chip.ngpio = NUM_GPIO;
+ pg->chip.can_sleep = 1;
+ pg->chip.dev = dev;
+
+ mutex_init(&pg->buslock);
+
+ pg->chip.dev = dev;
+ retval = gpiochip_add(&pg->chip);
+ if (retval) {
+ pr_err("Can not add pmic gpio chip\n");
+ goto err;
+ }
+
+ retval = request_irq(pg->irq, pmic_irq_handler, 0, "pmic", pg);
+ if (retval) {
+ pr_warn("Interrupt request failed\n");
+ goto fail_request_irq;
+ }
+
+ for (i = 0; i < 8; i++) {
+ irq_set_chip_and_handler_name(i + pg->irq_base,
+ &pmic_irqchip,
+ handle_simple_irq,
+ "demux");
+ irq_set_chip_data(i + pg->irq_base, pg);
+ }
+ return 0;
+
+fail_request_irq:
+ gpiochip_remove(&pg->chip);
+err:
+ iounmap(pg->gpiointr);
+err2:
+ kfree(pg);
+ return retval;
+}
+
+/* at the same time, register a platform driver
+ * this supports the sfi 0.81 fw */
+static struct platform_driver platform_pmic_gpio_driver = {
+ .driver = {
+ .name = DRIVER_NAME,
+ },
+ .probe = platform_pmic_gpio_probe,
+};
+
+static int __init platform_pmic_gpio_init(void)
+{
+ return platform_driver_register(&platform_pmic_gpio_driver);
+}
+
+subsys_initcall(platform_pmic_gpio_init);
+
+MODULE_AUTHOR("Alek Du <alek.du@intel.com>");
+MODULE_DESCRIPTION("Intel Moorestown PMIC GPIO driver");
+MODULE_LICENSE("GPL v2");
Code Review / kvmfornfv.git / blobdiff