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663fbb52 GU |
1 | /* |
2 | * R-Car Generation 2 da9063/da9210 regulator quirk | |
3 | * | |
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. | |
7 | * | |
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. | |
13 | * | |
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. | |
17 | * | |
18 | * Copyright (C) 2015 Glider bvba | |
19 | * | |
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. | |
23 | * | |
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. | |
28 | */ | |
29 | ||
30 | #include <linux/device.h> | |
31 | #include <linux/i2c.h> | |
32 | #include <linux/init.h> | |
33 | #include <linux/io.h> | |
34 | #include <linux/notifier.h> | |
35 | #include <linux/of.h> | |
36 | #include <linux/mfd/da9063/registers.h> | |
37 | ||
38 | ||
39 | #define IRQC_BASE 0xe61c0000 | |
40 | #define IRQC_MONITOR 0x104 /* IRQn Signal Level Monitor Register */ | |
41 | ||
42 | #define REGULATOR_IRQ_MASK BIT(2) /* IRQ2, active low */ | |
43 | ||
c2f32112 | 44 | /* start of DA9210 System Control and Event Registers */ |
663fbb52 | 45 | #define DA9210_REG_MASK_A 0x54 |
663fbb52 | 46 | |
c2f32112 | 47 | static void __iomem *irqc; |
663fbb52 | 48 | |
c2f32112 WS |
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 }; | |
52 | ||
53 | static struct i2c_msg da9xxx_msgs[2] = { | |
54 | { | |
55 | .addr = 0x58, | |
56 | .len = ARRAY_SIZE(da9063_irq_clr), | |
57 | .buf = da9063_irq_clr, | |
58 | }, { | |
59 | .addr = 0x68, | |
60 | .len = ARRAY_SIZE(da9210_irq_clr), | |
61 | .buf = da9210_irq_clr, | |
62 | }, | |
63 | }; | |
663fbb52 GU |
64 | |
65 | static int regulator_quirk_notify(struct notifier_block *nb, | |
66 | unsigned long action, void *data) | |
67 | { | |
68 | struct device *dev = data; | |
69 | struct i2c_client *client; | |
70 | u32 mon; | |
71 | ||
72 | mon = ioread32(irqc + IRQC_MONITOR); | |
73 | dev_dbg(dev, "%s: %ld, IRQC_MONITOR = 0x%x\n", __func__, action, mon); | |
74 | if (mon & REGULATOR_IRQ_MASK) | |
75 | goto remove; | |
76 | ||
77 | if (action != BUS_NOTIFY_ADD_DEVICE || dev->type == &i2c_adapter_type) | |
78 | return 0; | |
79 | ||
80 | client = to_i2c_client(dev); | |
81 | dev_dbg(dev, "Detected %s\n", client->name); | |
82 | ||
c2f32112 WS |
83 | if ((client->addr == 0x58 && !strcmp(client->name, "da9063")) || |
84 | (client->addr == 0x68 && !strcmp(client->name, "da9210"))) { | |
85 | int ret; | |
86 | ||
87 | dev_info(&client->dev, "clearing da9063/da9210 interrupts\n"); | |
88 | ret = i2c_transfer(client->adapter, da9xxx_msgs, ARRAY_SIZE(da9xxx_msgs)); | |
89 | if (ret != ARRAY_SIZE(da9xxx_msgs)) | |
90 | dev_err(&client->dev, "i2c error %d\n", ret); | |
91 | } | |
663fbb52 GU |
92 | |
93 | mon = ioread32(irqc + IRQC_MONITOR); | |
94 | if (mon & REGULATOR_IRQ_MASK) | |
95 | goto remove; | |
96 | ||
97 | return 0; | |
98 | ||
99 | remove: | |
100 | dev_info(dev, "IRQ2 is not asserted, removing quirk\n"); | |
101 | ||
102 | bus_unregister_notifier(&i2c_bus_type, nb); | |
103 | iounmap(irqc); | |
104 | return 0; | |
105 | } | |
106 | ||
107 | static struct notifier_block regulator_quirk_nb = { | |
108 | .notifier_call = regulator_quirk_notify | |
109 | }; | |
110 | ||
111 | static int __init rcar_gen2_regulator_quirk(void) | |
112 | { | |
113 | u32 mon; | |
114 | ||
115 | if (!of_machine_is_compatible("renesas,koelsch") && | |
765b5003 UH |
116 | !of_machine_is_compatible("renesas,lager") && |
117 | !of_machine_is_compatible("renesas,gose")) | |
663fbb52 GU |
118 | return -ENODEV; |
119 | ||
120 | irqc = ioremap(IRQC_BASE, PAGE_SIZE); | |
121 | if (!irqc) | |
122 | return -ENOMEM; | |
123 | ||
124 | mon = ioread32(irqc + IRQC_MONITOR); | |
125 | if (mon & REGULATOR_IRQ_MASK) { | |
126 | pr_debug("%s: IRQ2 is not asserted, not installing quirk\n", | |
127 | __func__); | |
128 | iounmap(irqc); | |
129 | return 0; | |
130 | } | |
131 | ||
132 | pr_info("IRQ2 is asserted, installing da9063/da9210 regulator quirk\n"); | |
133 | ||
134 | bus_register_notifier(&i2c_bus_type, ®ulator_quirk_nb); | |
135 | return 0; | |
136 | } | |
137 | ||
138 | arch_initcall(rcar_gen2_regulator_quirk); |