148 lines
4.1 KiB
C
148 lines
4.1 KiB
C
/*
|
|
* R-Car Generation 2 da9063/da9210 regulator quirk
|
|
*
|
|
* The r8a7790/lager and r8a7791/koelsch development boards have da9063 and
|
|
* da9210 regulators. Both regulators have their interrupt request lines tied
|
|
* to the same interrupt pin (IRQ2) on the SoC.
|
|
*
|
|
* After cold boot or da9063-induced restart, both the da9063 and da9210 seem
|
|
* to assert their interrupt request lines. Hence as soon as one driver
|
|
* requests this irq, it gets stuck in an interrupt storm, as it only manages
|
|
* to deassert its own interrupt request line, and the other driver hasn't
|
|
* installed an interrupt handler yet.
|
|
*
|
|
* To handle this, install a quirk that masks the interrupts in both the
|
|
* da9063 and da9210. This quirk has to run after the i2c master driver has
|
|
* been initialized, but before the i2c slave drivers are initialized.
|
|
*
|
|
* Copyright (C) 2015 Glider bvba
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; version 2 of the License.
|
|
*
|
|
* 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/device.h>
|
|
#include <linux/i2c.h>
|
|
#include <linux/init.h>
|
|
#include <linux/io.h>
|
|
#include <linux/notifier.h>
|
|
#include <linux/of.h>
|
|
#include <linux/mfd/da9063/registers.h>
|
|
|
|
|
|
#define IRQC_BASE 0xe61c0000
|
|
#define IRQC_MONITOR 0x104 /* IRQn Signal Level Monitor Register */
|
|
|
|
#define REGULATOR_IRQ_MASK BIT(2) /* IRQ2, active low */
|
|
|
|
static void __iomem *irqc;
|
|
|
|
static const u8 da9063_mask_regs[] = {
|
|
DA9063_REG_IRQ_MASK_A,
|
|
DA9063_REG_IRQ_MASK_B,
|
|
DA9063_REG_IRQ_MASK_C,
|
|
DA9063_REG_IRQ_MASK_D,
|
|
};
|
|
|
|
/* DA9210 System Control and Event Registers */
|
|
#define DA9210_REG_MASK_A 0x54
|
|
#define DA9210_REG_MASK_B 0x55
|
|
|
|
static const u8 da9210_mask_regs[] = {
|
|
DA9210_REG_MASK_A,
|
|
DA9210_REG_MASK_B,
|
|
};
|
|
|
|
static void da9xxx_mask_irqs(struct i2c_client *client, const u8 regs[],
|
|
unsigned int nregs)
|
|
{
|
|
unsigned int i;
|
|
|
|
dev_info(&client->dev, "Masking %s interrupt sources\n", client->name);
|
|
|
|
for (i = 0; i < nregs; i++) {
|
|
int error = i2c_smbus_write_byte_data(client, regs[i], ~0);
|
|
if (error) {
|
|
dev_err(&client->dev, "i2c error %d\n", error);
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
|
|
static int regulator_quirk_notify(struct notifier_block *nb,
|
|
unsigned long action, void *data)
|
|
{
|
|
struct device *dev = data;
|
|
struct i2c_client *client;
|
|
u32 mon;
|
|
|
|
mon = ioread32(irqc + IRQC_MONITOR);
|
|
dev_dbg(dev, "%s: %ld, IRQC_MONITOR = 0x%x\n", __func__, action, mon);
|
|
if (mon & REGULATOR_IRQ_MASK)
|
|
goto remove;
|
|
|
|
if (action != BUS_NOTIFY_ADD_DEVICE || dev->type == &i2c_adapter_type)
|
|
return 0;
|
|
|
|
client = to_i2c_client(dev);
|
|
dev_dbg(dev, "Detected %s\n", client->name);
|
|
|
|
if ((client->addr == 0x58 && !strcmp(client->name, "da9063")))
|
|
da9xxx_mask_irqs(client, da9063_mask_regs,
|
|
ARRAY_SIZE(da9063_mask_regs));
|
|
else if (client->addr == 0x68 && !strcmp(client->name, "da9210"))
|
|
da9xxx_mask_irqs(client, da9210_mask_regs,
|
|
ARRAY_SIZE(da9210_mask_regs));
|
|
|
|
mon = ioread32(irqc + IRQC_MONITOR);
|
|
if (mon & REGULATOR_IRQ_MASK)
|
|
goto remove;
|
|
|
|
return 0;
|
|
|
|
remove:
|
|
dev_info(dev, "IRQ2 is not asserted, removing quirk\n");
|
|
|
|
bus_unregister_notifier(&i2c_bus_type, nb);
|
|
iounmap(irqc);
|
|
return 0;
|
|
}
|
|
|
|
static struct notifier_block regulator_quirk_nb = {
|
|
.notifier_call = regulator_quirk_notify
|
|
};
|
|
|
|
static int __init rcar_gen2_regulator_quirk(void)
|
|
{
|
|
u32 mon;
|
|
|
|
if (!of_machine_is_compatible("renesas,koelsch") &&
|
|
!of_machine_is_compatible("renesas,lager"))
|
|
return -ENODEV;
|
|
|
|
irqc = ioremap(IRQC_BASE, PAGE_SIZE);
|
|
if (!irqc)
|
|
return -ENOMEM;
|
|
|
|
mon = ioread32(irqc + IRQC_MONITOR);
|
|
if (mon & REGULATOR_IRQ_MASK) {
|
|
pr_debug("%s: IRQ2 is not asserted, not installing quirk\n",
|
|
__func__);
|
|
iounmap(irqc);
|
|
return 0;
|
|
}
|
|
|
|
pr_info("IRQ2 is asserted, installing da9063/da9210 regulator quirk\n");
|
|
|
|
bus_register_notifier(&i2c_bus_type, ®ulator_quirk_nb);
|
|
return 0;
|
|
}
|
|
|
|
arch_initcall(rcar_gen2_regulator_quirk);
|