mfd: Add support for the MediaTek MT6397 PMIC
This adds support for the MediaTek MT6397 PMIC. This is a
multifunction device with the following sub modules:
- Regulator
- RTC
- Audio codec
- GPIO
- Clock
It is interfaced to the host controller using SPI interface by a proprietary
hardware called PMIC wrapper or pwrap. MT6397 MFD is a child device of the
pwrap.
Signed-off-by: Flora Fu, MediaTek
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
diff --git a/drivers/mfd/mt6397-core.c b/drivers/mfd/mt6397-core.c
new file mode 100644
index 0000000..09bc780
--- /dev/null
+++ b/drivers/mfd/mt6397-core.c
@@ -0,0 +1,227 @@
+/*
+ * Copyright (c) 2014 MediaTek Inc.
+ * Author: Flora Fu, MediaTek
+ *
+ * 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.
+ */
+
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/of_irq.h>
+#include <linux/regmap.h>
+#include <linux/mfd/core.h>
+#include <linux/mfd/mt6397/core.h>
+#include <linux/mfd/mt6397/registers.h>
+
+static const struct mfd_cell mt6397_devs[] = {
+ {
+ .name = "mt6397-rtc",
+ .of_compatible = "mediatek,mt6397-rtc",
+ }, {
+ .name = "mt6397-regulator",
+ .of_compatible = "mediatek,mt6397-regulator",
+ }, {
+ .name = "mt6397-codec",
+ .of_compatible = "mediatek,mt6397-codec",
+ }, {
+ .name = "mt6397-clk",
+ .of_compatible = "mediatek,mt6397-clk",
+ },
+};
+
+static void mt6397_irq_lock(struct irq_data *data)
+{
+ struct mt6397_chip *mt6397 = irq_get_chip_data(data->irq);
+
+ mutex_lock(&mt6397->irqlock);
+}
+
+static void mt6397_irq_sync_unlock(struct irq_data *data)
+{
+ struct mt6397_chip *mt6397 = irq_get_chip_data(data->irq);
+
+ regmap_write(mt6397->regmap, MT6397_INT_CON0, mt6397->irq_masks_cur[0]);
+ regmap_write(mt6397->regmap, MT6397_INT_CON1, mt6397->irq_masks_cur[1]);
+
+ mutex_unlock(&mt6397->irqlock);
+}
+
+static void mt6397_irq_disable(struct irq_data *data)
+{
+ struct mt6397_chip *mt6397 = irq_get_chip_data(data->irq);
+ int shift = data->hwirq & 0xf;
+ int reg = data->hwirq >> 4;
+
+ mt6397->irq_masks_cur[reg] &= ~BIT(shift);
+}
+
+static void mt6397_irq_enable(struct irq_data *data)
+{
+ struct mt6397_chip *mt6397 = irq_get_chip_data(data->irq);
+ int shift = data->hwirq & 0xf;
+ int reg = data->hwirq >> 4;
+
+ mt6397->irq_masks_cur[reg] |= BIT(shift);
+}
+
+static struct irq_chip mt6397_irq_chip = {
+ .name = "mt6397-irq",
+ .irq_bus_lock = mt6397_irq_lock,
+ .irq_bus_sync_unlock = mt6397_irq_sync_unlock,
+ .irq_enable = mt6397_irq_enable,
+ .irq_disable = mt6397_irq_disable,
+};
+
+static void mt6397_irq_handle_reg(struct mt6397_chip *mt6397, int reg,
+ int irqbase)
+{
+ unsigned int status;
+ int i, irq, ret;
+
+ ret = regmap_read(mt6397->regmap, reg, &status);
+ if (ret) {
+ dev_err(mt6397->dev, "Failed to read irq status: %d\n", ret);
+ return;
+ }
+
+ for (i = 0; i < 16; i++) {
+ if (status & BIT(i)) {
+ irq = irq_find_mapping(mt6397->irq_domain, irqbase + i);
+ if (irq)
+ handle_nested_irq(irq);
+ }
+ }
+
+ regmap_write(mt6397->regmap, reg, status);
+}
+
+static irqreturn_t mt6397_irq_thread(int irq, void *data)
+{
+ struct mt6397_chip *mt6397 = data;
+
+ mt6397_irq_handle_reg(mt6397, MT6397_INT_STATUS0, 0);
+ mt6397_irq_handle_reg(mt6397, MT6397_INT_STATUS1, 16);
+
+ return IRQ_HANDLED;
+}
+
+static int mt6397_irq_domain_map(struct irq_domain *d, unsigned int irq,
+ irq_hw_number_t hw)
+{
+ struct mt6397_chip *mt6397 = d->host_data;
+
+ irq_set_chip_data(irq, mt6397);
+ irq_set_chip_and_handler(irq, &mt6397_irq_chip, handle_level_irq);
+ irq_set_nested_thread(irq, 1);
+#ifdef CONFIG_ARM
+ set_irq_flags(irq, IRQF_VALID);
+#else
+ irq_set_noprobe(irq);
+#endif
+
+ return 0;
+}
+
+static struct irq_domain_ops mt6397_irq_domain_ops = {
+ .map = mt6397_irq_domain_map,
+};
+
+static int mt6397_irq_init(struct mt6397_chip *mt6397)
+{
+ int ret;
+
+ mutex_init(&mt6397->irqlock);
+
+ /* Mask all interrupt sources */
+ regmap_write(mt6397->regmap, MT6397_INT_CON0, 0x0);
+ regmap_write(mt6397->regmap, MT6397_INT_CON1, 0x0);
+
+ mt6397->irq_domain = irq_domain_add_linear(mt6397->dev->of_node,
+ MT6397_IRQ_NR, &mt6397_irq_domain_ops, mt6397);
+ if (!mt6397->irq_domain) {
+ dev_err(mt6397->dev, "could not create irq domain\n");
+ return -ENOMEM;
+ }
+
+ ret = devm_request_threaded_irq(mt6397->dev, mt6397->irq, NULL,
+ mt6397_irq_thread, IRQF_ONESHOT, "mt6397-pmic", mt6397);
+ if (ret) {
+ dev_err(mt6397->dev, "failed to register irq=%d; err: %d\n",
+ mt6397->irq, ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+static int mt6397_probe(struct platform_device *pdev)
+{
+ int ret;
+ struct mt6397_chip *mt6397;
+
+ mt6397 = devm_kzalloc(&pdev->dev, sizeof(*mt6397), GFP_KERNEL);
+ if (!mt6397)
+ return -ENOMEM;
+
+ mt6397->dev = &pdev->dev;
+ /*
+ * mt6397 MFD is child device of soc pmic wrapper.
+ * Regmap is set from its parent.
+ */
+ mt6397->regmap = dev_get_regmap(pdev->dev.parent, NULL);
+ if (!mt6397->regmap)
+ return -ENODEV;
+
+ platform_set_drvdata(pdev, mt6397);
+
+ mt6397->irq = platform_get_irq(pdev, 0);
+ if (mt6397->irq > 0) {
+ ret = mt6397_irq_init(mt6397);
+ if (ret)
+ return ret;
+ }
+
+ ret = mfd_add_devices(&pdev->dev, -1, mt6397_devs,
+ ARRAY_SIZE(mt6397_devs), NULL, 0, NULL);
+ if (ret)
+ dev_err(&pdev->dev, "failed to add child devices: %d\n", ret);
+
+ return ret;
+}
+
+static int mt6397_remove(struct platform_device *pdev)
+{
+ mfd_remove_devices(&pdev->dev);
+
+ return 0;
+}
+
+static const struct of_device_id mt6397_of_match[] = {
+ { .compatible = "mediatek,mt6397" },
+ { }
+};
+MODULE_DEVICE_TABLE(of, mt6397_of_match);
+
+static struct platform_driver mt6397_driver = {
+ .probe = mt6397_probe,
+ .remove = mt6397_remove,
+ .driver = {
+ .name = "mt6397",
+ .of_match_table = of_match_ptr(mt6397_of_match),
+ },
+};
+
+module_platform_driver(mt6397_driver);
+
+MODULE_AUTHOR("Flora Fu, MediaTek");
+MODULE_DESCRIPTION("Driver for MediaTek MT6397 PMIC");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:mt6397");