1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Device access for Basin Cove PMIC
4  *
5  * Copyright (c) 2019, Intel Corporation.
6  * Author: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
7  */
8 
9 #include <linux/acpi.h>
10 #include <linux/interrupt.h>
11 #include <linux/mfd/core.h>
12 #include <linux/mfd/intel_soc_pmic.h>
13 #include <linux/mfd/intel_soc_pmic_mrfld.h>
14 #include <linux/module.h>
15 #include <linux/platform_device.h>
16 #include <linux/regmap.h>
17 
18 #include <asm/intel_scu_ipc.h>
19 
20 /*
21  * Level 2 IRQs
22  *
23  * Firmware on the systems with Basin Cove PMIC services Level 1 IRQs
24  * without an assistance. Thus, each of the Level 1 IRQ is represented
25  * as a separate RTE in IOAPIC.
26  */
27 static struct resource irq_level2_resources[] = {
28 	DEFINE_RES_IRQ(0), /* power button */
29 	DEFINE_RES_IRQ(0), /* TMU */
30 	DEFINE_RES_IRQ(0), /* thermal */
31 	DEFINE_RES_IRQ(0), /* BCU */
32 	DEFINE_RES_IRQ(0), /* ADC */
33 	DEFINE_RES_IRQ(0), /* charger */
34 	DEFINE_RES_IRQ(0), /* GPIO */
35 };
36 
37 static const struct mfd_cell bcove_dev[] = {
38 	{
39 		.name = "mrfld_bcove_pwrbtn",
40 		.num_resources = 1,
41 		.resources = &irq_level2_resources[0],
42 	}, {
43 		.name = "mrfld_bcove_tmu",
44 		.num_resources = 1,
45 		.resources = &irq_level2_resources[1],
46 	}, {
47 		.name = "mrfld_bcove_thermal",
48 		.num_resources = 1,
49 		.resources = &irq_level2_resources[2],
50 	}, {
51 		.name = "mrfld_bcove_bcu",
52 		.num_resources = 1,
53 		.resources = &irq_level2_resources[3],
54 	}, {
55 		.name = "mrfld_bcove_adc",
56 		.num_resources = 1,
57 		.resources = &irq_level2_resources[4],
58 	}, {
59 		.name = "mrfld_bcove_charger",
60 		.num_resources = 1,
61 		.resources = &irq_level2_resources[5],
62 	}, {
63 		.name = "mrfld_bcove_pwrsrc",
64 		.num_resources = 1,
65 		.resources = &irq_level2_resources[5],
66 	}, {
67 		.name = "mrfld_bcove_gpio",
68 		.num_resources = 1,
69 		.resources = &irq_level2_resources[6],
70 	},
71 	{	.name = "mrfld_bcove_region", },
72 };
73 
bcove_ipc_byte_reg_read(void * context,unsigned int reg,unsigned int * val)74 static int bcove_ipc_byte_reg_read(void *context, unsigned int reg,
75 				    unsigned int *val)
76 {
77 	u8 ipc_out;
78 	int ret;
79 
80 	ret = intel_scu_ipc_ioread8(reg, &ipc_out);
81 	if (ret)
82 		return ret;
83 
84 	*val = ipc_out;
85 	return 0;
86 }
87 
bcove_ipc_byte_reg_write(void * context,unsigned int reg,unsigned int val)88 static int bcove_ipc_byte_reg_write(void *context, unsigned int reg,
89 				     unsigned int val)
90 {
91 	u8 ipc_in = val;
92 	int ret;
93 
94 	ret = intel_scu_ipc_iowrite8(reg, ipc_in);
95 	if (ret)
96 		return ret;
97 
98 	return 0;
99 }
100 
101 static const struct regmap_config bcove_regmap_config = {
102 	.reg_bits = 16,
103 	.val_bits = 8,
104 	.max_register = 0xff,
105 	.reg_write = bcove_ipc_byte_reg_write,
106 	.reg_read = bcove_ipc_byte_reg_read,
107 };
108 
bcove_probe(struct platform_device * pdev)109 static int bcove_probe(struct platform_device *pdev)
110 {
111 	struct device *dev = &pdev->dev;
112 	struct intel_soc_pmic *pmic;
113 	unsigned int i;
114 	int ret;
115 
116 	pmic = devm_kzalloc(dev, sizeof(*pmic), GFP_KERNEL);
117 	if (!pmic)
118 		return -ENOMEM;
119 
120 	platform_set_drvdata(pdev, pmic);
121 	pmic->dev = &pdev->dev;
122 
123 	pmic->regmap = devm_regmap_init(dev, NULL, pmic, &bcove_regmap_config);
124 	if (IS_ERR(pmic->regmap))
125 		return PTR_ERR(pmic->regmap);
126 
127 	for (i = 0; i < ARRAY_SIZE(irq_level2_resources); i++) {
128 		ret = platform_get_irq(pdev, i);
129 		if (ret < 0)
130 			return ret;
131 
132 		irq_level2_resources[i].start = ret;
133 		irq_level2_resources[i].end = ret;
134 	}
135 
136 	return devm_mfd_add_devices(dev, PLATFORM_DEVID_NONE,
137 				    bcove_dev, ARRAY_SIZE(bcove_dev),
138 				    NULL, 0, NULL);
139 }
140 
141 static const struct acpi_device_id bcove_acpi_ids[] = {
142 	{ "INTC100E" },
143 	{}
144 };
145 MODULE_DEVICE_TABLE(acpi, bcove_acpi_ids);
146 
147 static struct platform_driver bcove_driver = {
148 	.driver = {
149 		.name = "intel_soc_pmic_mrfld",
150 		.acpi_match_table = bcove_acpi_ids,
151 	},
152 	.probe = bcove_probe,
153 };
154 module_platform_driver(bcove_driver);
155 
156 MODULE_DESCRIPTION("IPC driver for Intel SoC Basin Cove PMIC");
157 MODULE_LICENSE("GPL v2");
158