2 * R-Car Generation 2 da9063/da9210 regulator quirk
4 * The r8a7790/lager and r8a7791/koelsch development boards have da9063 and
5 * da9210 regulators. Both regulators have their interrupt request lines tied
6 * to the same interrupt pin (IRQ2) on the SoC.
8 * After cold boot or da9063-induced restart, both the da9063 and da9210 seem
9 * to assert their interrupt request lines. Hence as soon as one driver
10 * requests this irq, it gets stuck in an interrupt storm, as it only manages
11 * to deassert its own interrupt request line, and the other driver hasn't
12 * installed an interrupt handler yet.
14 * To handle this, install a quirk that masks the interrupts in both the
15 * da9063 and da9210. This quirk has to run after the i2c master driver has
16 * been initialized, but before the i2c slave drivers are initialized.
18 * Copyright (C) 2015 Glider bvba
20 * This program is free software; you can redistribute it and/or modify
21 * it under the terms of the GNU General Public License as published by
22 * the Free Software Foundation; version 2 of the License.
24 * This program is distributed in the hope that it will be useful,
25 * but WITHOUT ANY WARRANTY; without even the implied warranty of
26 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
27 * GNU General Public License for more details.
30 #include <linux/device.h>
31 #include <linux/i2c.h>
32 #include <linux/init.h>
34 #include <linux/notifier.h>
36 #include <linux/mfd/da9063/registers.h>
39 #define IRQC_BASE 0xe61c0000
40 #define IRQC_MONITOR 0x104 /* IRQn Signal Level Monitor Register */
42 #define REGULATOR_IRQ_MASK BIT(2) /* IRQ2, active low */
44 /* start of DA9210 System Control and Event Registers */
45 #define DA9210_REG_MASK_A 0x54
47 static void __iomem
*irqc
;
49 /* first byte sets the memory pointer, following are consecutive reg values */
50 static u8 da9063_irq_clr
[] = { DA9063_REG_IRQ_MASK_A
, 0xff, 0xff, 0xff, 0xff };
51 static u8 da9210_irq_clr
[] = { DA9210_REG_MASK_A
, 0xff, 0xff };
53 static struct i2c_msg da9xxx_msgs
[2] = {
56 .len
= ARRAY_SIZE(da9063_irq_clr
),
57 .buf
= da9063_irq_clr
,
60 .len
= ARRAY_SIZE(da9210_irq_clr
),
61 .buf
= da9210_irq_clr
,
65 static int regulator_quirk_notify(struct notifier_block
*nb
,
66 unsigned long action
, void *data
)
68 struct device
*dev
= data
;
69 struct i2c_client
*client
;
76 mon
= ioread32(irqc
+ IRQC_MONITOR
);
77 dev_dbg(dev
, "%s: %ld, IRQC_MONITOR = 0x%x\n", __func__
, action
, mon
);
78 if (mon
& REGULATOR_IRQ_MASK
)
81 if (action
!= BUS_NOTIFY_ADD_DEVICE
|| dev
->type
== &i2c_adapter_type
)
84 client
= to_i2c_client(dev
);
85 dev_dbg(dev
, "Detected %s\n", client
->name
);
87 if ((client
->addr
== 0x58 && !strcmp(client
->name
, "da9063")) ||
88 (client
->addr
== 0x68 && !strcmp(client
->name
, "da9210"))) {
91 dev_info(&client
->dev
, "clearing da9063/da9210 interrupts\n");
92 ret
= i2c_transfer(client
->adapter
, da9xxx_msgs
, ARRAY_SIZE(da9xxx_msgs
));
93 if (ret
!= ARRAY_SIZE(da9xxx_msgs
))
94 dev_err(&client
->dev
, "i2c error %d\n", ret
);
97 mon
= ioread32(irqc
+ IRQC_MONITOR
);
98 if (mon
& REGULATOR_IRQ_MASK
)
104 dev_info(dev
, "IRQ2 is not asserted, removing quirk\n");
111 static struct notifier_block regulator_quirk_nb
= {
112 .notifier_call
= regulator_quirk_notify
115 static int __init
rcar_gen2_regulator_quirk(void)
119 if (!of_machine_is_compatible("renesas,koelsch") &&
120 !of_machine_is_compatible("renesas,lager") &&
121 !of_machine_is_compatible("renesas,gose"))
124 irqc
= ioremap(IRQC_BASE
, PAGE_SIZE
);
128 mon
= ioread32(irqc
+ IRQC_MONITOR
);
129 if (mon
& REGULATOR_IRQ_MASK
) {
130 pr_debug("%s: IRQ2 is not asserted, not installing quirk\n",
136 pr_info("IRQ2 is asserted, installing da9063/da9210 regulator quirk\n");
138 bus_register_notifier(&i2c_bus_type
, ®ulator_quirk_nb
);
142 arch_initcall(rcar_gen2_regulator_quirk
);