Initial import

1 files changed, 396 insertions, 0 deletions

diff --git a/drivers/mfd/pm8921-core.c b/drivers/mfd/pm8921-core.c
new file mode 100644
index 000000000..5a92646a2
--- /dev/null
+++ b/drivers/mfd/pm8921-core.c
@@ -0,0 +1,396 @@
+/*
+ * Copyright (c) 2011, Code Aurora Forum. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only 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.
+ */
+
+#define pr_fmt(fmt) "%s: " fmt, __func__
+
+#include <linux/kernel.h>
+#include <linux/interrupt.h>
+#include <linux/irqchip/chained_irq.h>
+#include <linux/irq.h>
+#include <linux/irqdomain.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/err.h>
+#include <linux/ssbi.h>
+#include <linux/regmap.h>
+#include <linux/of_platform.h>
+#include <linux/mfd/core.h>
+
+#define	SSBI_REG_ADDR_IRQ_BASE		0x1BB
+
+#define	SSBI_REG_ADDR_IRQ_ROOT		(SSBI_REG_ADDR_IRQ_BASE + 0)
+#define	SSBI_REG_ADDR_IRQ_M_STATUS1	(SSBI_REG_ADDR_IRQ_BASE + 1)
+#define	SSBI_REG_ADDR_IRQ_M_STATUS2	(SSBI_REG_ADDR_IRQ_BASE + 2)
+#define	SSBI_REG_ADDR_IRQ_M_STATUS3	(SSBI_REG_ADDR_IRQ_BASE + 3)
+#define	SSBI_REG_ADDR_IRQ_M_STATUS4	(SSBI_REG_ADDR_IRQ_BASE + 4)
+#define	SSBI_REG_ADDR_IRQ_BLK_SEL	(SSBI_REG_ADDR_IRQ_BASE + 5)
+#define	SSBI_REG_ADDR_IRQ_IT_STATUS	(SSBI_REG_ADDR_IRQ_BASE + 6)
+#define	SSBI_REG_ADDR_IRQ_CONFIG	(SSBI_REG_ADDR_IRQ_BASE + 7)
+#define	SSBI_REG_ADDR_IRQ_RT_STATUS	(SSBI_REG_ADDR_IRQ_BASE + 8)
+
+#define	PM_IRQF_LVL_SEL			0x01	/* level select */
+#define	PM_IRQF_MASK_FE			0x02	/* mask falling edge */
+#define	PM_IRQF_MASK_RE			0x04	/* mask rising edge */
+#define	PM_IRQF_CLR			0x08	/* clear interrupt */
+#define	PM_IRQF_BITS_MASK		0x70
+#define	PM_IRQF_BITS_SHIFT		4
+#define	PM_IRQF_WRITE			0x80
+
+#define	PM_IRQF_MASK_ALL		(PM_IRQF_MASK_FE | \
+					PM_IRQF_MASK_RE)
+
+#define REG_HWREV		0x002  /* PMIC4 revision */
+#define REG_HWREV_2		0x0E8  /* PMIC4 revision 2 */
+
+#define PM8921_NR_IRQS		256
+
+struct pm_irq_chip {
+	struct regmap		*regmap;
+	spinlock_t		pm_irq_lock;
+	struct irq_domain	*irqdomain;
+	unsigned int		num_irqs;
+	unsigned int		num_blocks;
+	unsigned int		num_masters;
+	u8			config[0];
+};
+
+static int pm8xxx_read_block_irq(struct pm_irq_chip *chip, unsigned int bp,
+				 unsigned int *ip)
+{
+	int	rc;
+
+	spin_lock(&chip->pm_irq_lock);
+	rc = regmap_write(chip->regmap, SSBI_REG_ADDR_IRQ_BLK_SEL, bp);
+	if (rc) {
+		pr_err("Failed Selecting Block %d rc=%d\n", bp, rc);
+		goto bail;
+	}
+
+	rc = regmap_read(chip->regmap, SSBI_REG_ADDR_IRQ_IT_STATUS, ip);
+	if (rc)
+		pr_err("Failed Reading Status rc=%d\n", rc);
+bail:
+	spin_unlock(&chip->pm_irq_lock);
+	return rc;
+}
+
+static int
+pm8xxx_config_irq(struct pm_irq_chip *chip, unsigned int bp, unsigned int cp)
+{
+	int	rc;
+
+	spin_lock(&chip->pm_irq_lock);
+	rc = regmap_write(chip->regmap, SSBI_REG_ADDR_IRQ_BLK_SEL, bp);
+	if (rc) {
+		pr_err("Failed Selecting Block %d rc=%d\n", bp, rc);
+		goto bail;
+	}
+
+	cp |= PM_IRQF_WRITE;
+	rc = regmap_write(chip->regmap, SSBI_REG_ADDR_IRQ_CONFIG, cp);
+	if (rc)
+		pr_err("Failed Configuring IRQ rc=%d\n", rc);
+bail:
+	spin_unlock(&chip->pm_irq_lock);
+	return rc;
+}
+
+static int pm8xxx_irq_block_handler(struct pm_irq_chip *chip, int block)
+{
+	int pmirq, irq, i, ret = 0;
+	unsigned int bits;
+
+	ret = pm8xxx_read_block_irq(chip, block, &bits);
+	if (ret) {
+		pr_err("Failed reading %d block ret=%d", block, ret);
+		return ret;
+	}
+	if (!bits) {
+		pr_err("block bit set in master but no irqs: %d", block);
+		return 0;
+	}
+
+	/* Check IRQ bits */
+	for (i = 0; i < 8; i++) {
+		if (bits & (1 << i)) {
+			pmirq = block * 8 + i;
+			irq = irq_find_mapping(chip->irqdomain, pmirq);
+			generic_handle_irq(irq);
+		}
+	}
+	return 0;
+}
+
+static int pm8xxx_irq_master_handler(struct pm_irq_chip *chip, int master)
+{
+	unsigned int blockbits;
+	int block_number, i, ret = 0;
+
+	ret = regmap_read(chip->regmap, SSBI_REG_ADDR_IRQ_M_STATUS1 + master,
+			  &blockbits);
+	if (ret) {
+		pr_err("Failed to read master %d ret=%d\n", master, ret);
+		return ret;
+	}
+	if (!blockbits) {
+		pr_err("master bit set in root but no blocks: %d", master);
+		return 0;
+	}
+
+	for (i = 0; i < 8; i++)
+		if (blockbits & (1 << i)) {
+			block_number = master * 8 + i;	/* block # */
+			ret |= pm8xxx_irq_block_handler(chip, block_number);
+		}
+	return ret;
+}
+
+static void pm8xxx_irq_handler(unsigned int irq, struct irq_desc *desc)
+{
+	struct pm_irq_chip *chip = irq_desc_get_handler_data(desc);
+	struct irq_chip *irq_chip = irq_desc_get_chip(desc);
+	unsigned int root;
+	int	i, ret, masters = 0;
+
+	chained_irq_enter(irq_chip, desc);
+
+	ret = regmap_read(chip->regmap, SSBI_REG_ADDR_IRQ_ROOT, &root);
+	if (ret) {
+		pr_err("Can't read root status ret=%d\n", ret);
+		return;
+	}
+
+	/* on pm8xxx series masters start from bit 1 of the root */
+	masters = root >> 1;
+
+	/* Read allowed masters for blocks. */
+	for (i = 0; i < chip->num_masters; i++)
+		if (masters & (1 << i))
+			pm8xxx_irq_master_handler(chip, i);
+
+	chained_irq_exit(irq_chip, desc);
+}
+
+static void pm8xxx_irq_mask_ack(struct irq_data *d)
+{
+	struct pm_irq_chip *chip = irq_data_get_irq_chip_data(d);
+	unsigned int pmirq = irqd_to_hwirq(d);
+	u8	block, config;
+
+	block = pmirq / 8;
+
+	config = chip->config[pmirq] | PM_IRQF_MASK_ALL | PM_IRQF_CLR;
+	pm8xxx_config_irq(chip, block, config);
+}
+
+static void pm8xxx_irq_unmask(struct irq_data *d)
+{
+	struct pm_irq_chip *chip = irq_data_get_irq_chip_data(d);
+	unsigned int pmirq = irqd_to_hwirq(d);
+	u8	block, config;
+
+	block = pmirq / 8;
+
+	config = chip->config[pmirq];
+	pm8xxx_config_irq(chip, block, config);
+}
+
+static int pm8xxx_irq_set_type(struct irq_data *d, unsigned int flow_type)
+{
+	struct pm_irq_chip *chip = irq_data_get_irq_chip_data(d);
+	unsigned int pmirq = irqd_to_hwirq(d);
+	int irq_bit;
+	u8 block, config;
+
+	block = pmirq / 8;
+	irq_bit  = pmirq % 8;
+
+	chip->config[pmirq] = (irq_bit << PM_IRQF_BITS_SHIFT)
+							| PM_IRQF_MASK_ALL;
+	if (flow_type & (IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING)) {
+		if (flow_type & IRQF_TRIGGER_RISING)
+			chip->config[pmirq] &= ~PM_IRQF_MASK_RE;
+		if (flow_type & IRQF_TRIGGER_FALLING)
+			chip->config[pmirq] &= ~PM_IRQF_MASK_FE;
+	} else {
+		chip->config[pmirq] |= PM_IRQF_LVL_SEL;
+
+		if (flow_type & IRQF_TRIGGER_HIGH)
+			chip->config[pmirq] &= ~PM_IRQF_MASK_RE;
+		else
+			chip->config[pmirq] &= ~PM_IRQF_MASK_FE;
+	}
+
+	config = chip->config[pmirq] | PM_IRQF_CLR;
+	return pm8xxx_config_irq(chip, block, config);
+}
+
+static struct irq_chip pm8xxx_irq_chip = {
+	.name		= "pm8xxx",
+	.irq_mask_ack	= pm8xxx_irq_mask_ack,
+	.irq_unmask	= pm8xxx_irq_unmask,
+	.irq_set_type	= pm8xxx_irq_set_type,
+	.flags		= IRQCHIP_MASK_ON_SUSPEND | IRQCHIP_SKIP_SET_WAKE,
+};
+
+static int pm8xxx_irq_domain_map(struct irq_domain *d, unsigned int irq,
+				   irq_hw_number_t hwirq)
+{
+	struct pm_irq_chip *chip = d->host_data;
+
+	irq_set_chip_and_handler(irq, &pm8xxx_irq_chip, handle_level_irq);
+	irq_set_chip_data(irq, chip);
+#ifdef CONFIG_ARM
+	set_irq_flags(irq, IRQF_VALID);
+#else
+	irq_set_noprobe(irq);
+#endif
+	return 0;
+}
+
+static const struct irq_domain_ops pm8xxx_irq_domain_ops = {
+	.xlate = irq_domain_xlate_twocell,
+	.map = pm8xxx_irq_domain_map,
+};
+
+static const struct regmap_config ssbi_regmap_config = {
+	.reg_bits = 16,
+	.val_bits = 8,
+	.max_register = 0x3ff,
+	.fast_io = true,
+	.reg_read = ssbi_reg_read,
+	.reg_write = ssbi_reg_write
+};
+
+static const struct of_device_id pm8921_id_table[] = {
+	{ .compatible = "qcom,pm8058", },
+	{ .compatible = "qcom,pm8921", },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, pm8921_id_table);
+
+static int pm8921_probe(struct platform_device *pdev)
+{
+	struct regmap *regmap;
+	int irq, rc;
+	unsigned int val;
+	u32 rev;
+	struct pm_irq_chip *chip;
+	unsigned int nirqs = PM8921_NR_IRQS;
+
+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0)
+		return irq;
+
+	regmap = devm_regmap_init(&pdev->dev, NULL, pdev->dev.parent,
+				  &ssbi_regmap_config);
+	if (IS_ERR(regmap))
+		return PTR_ERR(regmap);
+
+	/* Read PMIC chip revision */
+	rc = regmap_read(regmap, REG_HWREV, &val);
+	if (rc) {
+		pr_err("Failed to read hw rev reg %d:rc=%d\n", REG_HWREV, rc);
+		return rc;
+	}
+	pr_info("PMIC revision 1: %02X\n", val);
+	rev = val;
+
+	/* Read PMIC chip revision 2 */
+	rc = regmap_read(regmap, REG_HWREV_2, &val);
+	if (rc) {
+		pr_err("Failed to read hw rev 2 reg %d:rc=%d\n",
+			REG_HWREV_2, rc);
+		return rc;
+	}
+	pr_info("PMIC revision 2: %02X\n", val);
+	rev |= val << BITS_PER_BYTE;
+
+	chip = devm_kzalloc(&pdev->dev, sizeof(*chip) +
+					sizeof(chip->config[0]) * nirqs,
+					GFP_KERNEL);
+	if (!chip)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, chip);
+	chip->regmap = regmap;
+	chip->num_irqs = nirqs;
+	chip->num_blocks = DIV_ROUND_UP(chip->num_irqs, 8);
+	chip->num_masters = DIV_ROUND_UP(chip->num_blocks, 8);
+	spin_lock_init(&chip->pm_irq_lock);
+
+	chip->irqdomain = irq_domain_add_linear(pdev->dev.of_node, nirqs,
+						&pm8xxx_irq_domain_ops,
+						chip);
+	if (!chip->irqdomain)
+		return -ENODEV;
+
+	irq_set_handler_data(irq, chip);
+	irq_set_chained_handler(irq, pm8xxx_irq_handler);
+	irq_set_irq_wake(irq, 1);
+
+	rc = of_platform_populate(pdev->dev.of_node, NULL, NULL, &pdev->dev);
+	if (rc) {
+		irq_set_chained_handler(irq, NULL);
+		irq_set_handler_data(irq, NULL);
+		irq_domain_remove(chip->irqdomain);
+	}
+
+	return rc;
+}
+
+static int pm8921_remove_child(struct device *dev, void *unused)
+{
+	platform_device_unregister(to_platform_device(dev));
+	return 0;
+}
+
+static int pm8921_remove(struct platform_device *pdev)
+{
+	int irq = platform_get_irq(pdev, 0);
+	struct pm_irq_chip *chip = platform_get_drvdata(pdev);
+
+	device_for_each_child(&pdev->dev, NULL, pm8921_remove_child);
+	irq_set_chained_handler(irq, NULL);
+	irq_set_handler_data(irq, NULL);
+	irq_domain_remove(chip->irqdomain);
+
+	return 0;
+}
+
+static struct platform_driver pm8921_driver = {
+	.probe		= pm8921_probe,
+	.remove		= pm8921_remove,
+	.driver		= {
+		.name	= "pm8921-core",
+		.of_match_table = pm8921_id_table,
+	},
+};
+
+static int __init pm8921_init(void)
+{
+	return platform_driver_register(&pm8921_driver);
+}
+subsys_initcall(pm8921_init);
+
+static void __exit pm8921_exit(void)
+{
+	platform_driver_unregister(&pm8921_driver);
+}
+module_exit(pm8921_exit);
+
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("PMIC 8921 core driver");
+MODULE_VERSION("1.0");
+MODULE_ALIAS("platform:pm8921-core");