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 struct intel_soc_pmic *pmic = context;
78 u8 ipc_out;
79 int ret;
80
81 ret = intel_scu_ipc_dev_ioread8(pmic->scu, reg, &ipc_out);
82 if (ret)
83 return ret;
84
85 *val = ipc_out;
86 return 0;
87 }
88
bcove_ipc_byte_reg_write(void * context,unsigned int reg,unsigned int val)89 static int bcove_ipc_byte_reg_write(void *context, unsigned int reg,
90 unsigned int val)
91 {
92 struct intel_soc_pmic *pmic = context;
93 u8 ipc_in = val;
94
95 return intel_scu_ipc_dev_iowrite8(pmic->scu, reg, ipc_in);
96 }
97
98 static const struct regmap_config bcove_regmap_config = {
99 .reg_bits = 16,
100 .val_bits = 8,
101 .max_register = 0xff,
102 .reg_write = bcove_ipc_byte_reg_write,
103 .reg_read = bcove_ipc_byte_reg_read,
104 };
105
bcove_probe(struct platform_device * pdev)106 static int bcove_probe(struct platform_device *pdev)
107 {
108 struct device *dev = &pdev->dev;
109 struct intel_soc_pmic *pmic;
110 unsigned int i;
111 int ret;
112
113 pmic = devm_kzalloc(dev, sizeof(*pmic), GFP_KERNEL);
114 if (!pmic)
115 return -ENOMEM;
116
117 pmic->scu = devm_intel_scu_ipc_dev_get(dev);
118 if (!pmic->scu)
119 return -ENOMEM;
120
121 platform_set_drvdata(pdev, pmic);
122 pmic->dev = &pdev->dev;
123
124 pmic->regmap = devm_regmap_init(dev, NULL, pmic, &bcove_regmap_config);
125 if (IS_ERR(pmic->regmap))
126 return PTR_ERR(pmic->regmap);
127
128 for (i = 0; i < ARRAY_SIZE(irq_level2_resources); i++) {
129 ret = platform_get_irq(pdev, i);
130 if (ret < 0)
131 return ret;
132
133 irq_level2_resources[i].start = ret;
134 irq_level2_resources[i].end = ret;
135 }
136
137 return devm_mfd_add_devices(dev, PLATFORM_DEVID_NONE,
138 bcove_dev, ARRAY_SIZE(bcove_dev),
139 NULL, 0, NULL);
140 }
141
142 static const struct acpi_device_id bcove_acpi_ids[] = {
143 { "INTC100E" },
144 {}
145 };
146 MODULE_DEVICE_TABLE(acpi, bcove_acpi_ids);
147
148 static struct platform_driver bcove_driver = {
149 .driver = {
150 .name = "intel_soc_pmic_mrfld",
151 .acpi_match_table = bcove_acpi_ids,
152 },
153 .probe = bcove_probe,
154 };
155 module_platform_driver(bcove_driver);
156
157 MODULE_DESCRIPTION("IPC driver for Intel SoC Basin Cove PMIC");
158 MODULE_LICENSE("GPL v2");
159