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@@ -0,0 +1,147 @@
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+/*
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+ * R-Car Generation 2 da9063/da9210 regulator quirk
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+ *
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+ * The r8a7790/lager and r8a7791/koelsch development boards have da9063 and
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+ * da9210 regulators. Both regulators have their interrupt request lines tied
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+ * to the same interrupt pin (IRQ2) on the SoC.
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+ *
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+ * After cold boot or da9063-induced restart, both the da9063 and da9210 seem
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+ * to assert their interrupt request lines. Hence as soon as one driver
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+ * requests this irq, it gets stuck in an interrupt storm, as it only manages
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+ * to deassert its own interrupt request line, and the other driver hasn't
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+ * installed an interrupt handler yet.
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+ *
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+ * To handle this, install a quirk that masks the interrupts in both the
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+ * da9063 and da9210. This quirk has to run after the i2c master driver has
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+ * been initialized, but before the i2c slave drivers are initialized.
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+ *
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+ * Copyright (C) 2015 Glider bvba
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+ *
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+ * This program is free software; you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License as published by
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+ * the Free Software Foundation; version 2 of the License.
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+ *
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+ * This program is distributed in the hope that it will be useful,
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+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+ * GNU General Public License for more details.
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+ */
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+
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+#include <linux/device.h>
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+#include <linux/i2c.h>
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+#include <linux/init.h>
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+#include <linux/io.h>
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+#include <linux/notifier.h>
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+#include <linux/of.h>
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+#include <linux/mfd/da9063/registers.h>
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+
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+
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+#define IRQC_BASE 0xe61c0000
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+#define IRQC_MONITOR 0x104 /* IRQn Signal Level Monitor Register */
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+
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+#define REGULATOR_IRQ_MASK BIT(2) /* IRQ2, active low */
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+
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+static void __iomem *irqc;
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+
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+static const u8 da9063_mask_regs[] = {
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+ DA9063_REG_IRQ_MASK_A,
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+ DA9063_REG_IRQ_MASK_B,
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+ DA9063_REG_IRQ_MASK_C,
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+ DA9063_REG_IRQ_MASK_D,
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+};
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+
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+/* DA9210 System Control and Event Registers */
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+#define DA9210_REG_MASK_A 0x54
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+#define DA9210_REG_MASK_B 0x55
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+
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+static const u8 da9210_mask_regs[] = {
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+ DA9210_REG_MASK_A,
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+ DA9210_REG_MASK_B,
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+};
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+
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+static void da9xxx_mask_irqs(struct i2c_client *client, const u8 regs[],
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+ unsigned int nregs)
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+{
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+ unsigned int i;
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+
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+ dev_info(&client->dev, "Masking %s interrupt sources\n", client->name);
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+
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+ for (i = 0; i < nregs; i++) {
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+ int error = i2c_smbus_write_byte_data(client, regs[i], ~0);
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+ if (error) {
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+ dev_err(&client->dev, "i2c error %d\n", error);
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+ return;
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+ }
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+ }
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+}
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+
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+static int regulator_quirk_notify(struct notifier_block *nb,
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+ unsigned long action, void *data)
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+{
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+ struct device *dev = data;
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+ struct i2c_client *client;
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+ u32 mon;
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+
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+ mon = ioread32(irqc + IRQC_MONITOR);
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+ dev_dbg(dev, "%s: %ld, IRQC_MONITOR = 0x%x\n", __func__, action, mon);
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+ if (mon & REGULATOR_IRQ_MASK)
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+ goto remove;
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+
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+ if (action != BUS_NOTIFY_ADD_DEVICE || dev->type == &i2c_adapter_type)
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+ return 0;
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+
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+ client = to_i2c_client(dev);
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+ dev_dbg(dev, "Detected %s\n", client->name);
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+
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+ if ((client->addr == 0x58 && !strcmp(client->name, "da9063")))
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+ da9xxx_mask_irqs(client, da9063_mask_regs,
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+ ARRAY_SIZE(da9063_mask_regs));
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+ else if (client->addr == 0x68 && !strcmp(client->name, "da9210"))
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+ da9xxx_mask_irqs(client, da9210_mask_regs,
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+ ARRAY_SIZE(da9210_mask_regs));
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+
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+ mon = ioread32(irqc + IRQC_MONITOR);
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+ if (mon & REGULATOR_IRQ_MASK)
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+ goto remove;
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+
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+ return 0;
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+
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+remove:
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+ dev_info(dev, "IRQ2 is not asserted, removing quirk\n");
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+
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+ bus_unregister_notifier(&i2c_bus_type, nb);
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+ iounmap(irqc);
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+ return 0;
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+}
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+
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+static struct notifier_block regulator_quirk_nb = {
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+ .notifier_call = regulator_quirk_notify
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+};
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+
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+static int __init rcar_gen2_regulator_quirk(void)
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+{
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+ u32 mon;
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+
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+ if (!of_machine_is_compatible("renesas,koelsch") &&
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+ !of_machine_is_compatible("renesas,lager"))
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+ return -ENODEV;
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+
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+ irqc = ioremap(IRQC_BASE, PAGE_SIZE);
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+ if (!irqc)
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+ return -ENOMEM;
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+
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+ mon = ioread32(irqc + IRQC_MONITOR);
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+ if (mon & REGULATOR_IRQ_MASK) {
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+ pr_debug("%s: IRQ2 is not asserted, not installing quirk\n",
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+ __func__);
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+ iounmap(irqc);
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+ return 0;
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+ }
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+
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+ pr_info("IRQ2 is asserted, installing da9063/da9210 regulator quirk\n");
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+
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+ bus_register_notifier(&i2c_bus_type, ®ulator_quirk_nb);
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+ return 0;
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+}
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+
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+arch_initcall(rcar_gen2_regulator_quirk);
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Arnd Bergmann