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1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * platform_bcm43xx.c: bcm43xx platform data initialization file
4  *
5  * (C) Copyright 2016 Intel Corporation
6  * Author: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
7  */
8 
9 #include <linux/gpio/machine.h>
10 #include <linux/platform_device.h>
11 #include <linux/regulator/machine.h>
12 #include <linux/regulator/fixed.h>
13 #include <linux/sfi.h>
14 
15 #include <asm/intel-mid.h>
16 
17 #define WLAN_SFI_GPIO_IRQ_NAME		"WLAN-interrupt"
18 #define WLAN_SFI_GPIO_ENABLE_NAME	"WLAN-enable"
19 
20 #define WLAN_DEV_NAME			"0000:00:01.3"
21 
22 static struct regulator_consumer_supply bcm43xx_vmmc_supply = {
23 	.dev_name		= WLAN_DEV_NAME,
24 	.supply			= "vmmc",
25 };
26 
27 static struct regulator_init_data bcm43xx_vmmc_data = {
28 	.constraints = {
29 		.valid_ops_mask		= REGULATOR_CHANGE_STATUS,
30 	},
31 	.num_consumer_supplies	= 1,
32 	.consumer_supplies	= &bcm43xx_vmmc_supply,
33 };
34 
35 static struct fixed_voltage_config bcm43xx_vmmc = {
36 	.supply_name		= "bcm43xx-vmmc-regulator",
37 	/*
38 	 * Announce 2.0V here to be compatible with SDIO specification. The
39 	 * real voltage and signaling are still 1.8V.
40 	 */
41 	.microvolts		= 2000000,		/* 1.8V */
42 	.startup_delay		= 250 * 1000,		/* 250ms */
43 	.enabled_at_boot	= 0,			/* disabled at boot */
44 	.init_data		= &bcm43xx_vmmc_data,
45 };
46 
47 static struct platform_device bcm43xx_vmmc_regulator = {
48 	.name		= "reg-fixed-voltage",
49 	.id		= PLATFORM_DEVID_AUTO,
50 	.dev = {
51 		.platform_data	= &bcm43xx_vmmc,
52 	},
53 };
54 
55 static struct gpiod_lookup_table bcm43xx_vmmc_gpio_table = {
56 	.dev_id	= "reg-fixed-voltage.0",
57 	.table	= {
58 		GPIO_LOOKUP("0000:00:0c.0", -1, NULL, GPIO_ACTIVE_LOW),
59 		{}
60 	},
61 };
62 
bcm43xx_regulator_register(void)63 static int __init bcm43xx_regulator_register(void)
64 {
65 	struct gpiod_lookup_table *table = &bcm43xx_vmmc_gpio_table;
66 	struct gpiod_lookup *lookup = table->table;
67 	int ret;
68 
69 	lookup[0].chip_hwnum = get_gpio_by_name(WLAN_SFI_GPIO_ENABLE_NAME);
70 	gpiod_add_lookup_table(table);
71 
72 	ret = platform_device_register(&bcm43xx_vmmc_regulator);
73 	if (ret) {
74 		pr_err("%s: vmmc regulator register failed\n", __func__);
75 		return ret;
76 	}
77 
78 	return 0;
79 }
80 
bcm43xx_platform_data(void * info)81 static void __init *bcm43xx_platform_data(void *info)
82 {
83 	int ret;
84 
85 	ret = bcm43xx_regulator_register();
86 	if (ret)
87 		return NULL;
88 
89 	pr_info("Using generic wifi platform data\n");
90 
91 	/* For now it's empty */
92 	return NULL;
93 }
94 
95 static const struct devs_id bcm43xx_clk_vmmc_dev_id __initconst = {
96 	.name			= "bcm43xx_clk_vmmc",
97 	.type			= SFI_DEV_TYPE_SD,
98 	.get_platform_data	= &bcm43xx_platform_data,
99 };
100 
101 sfi_device(bcm43xx_clk_vmmc_dev_id);
102