1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * AMD ACPI support for ACPI2platform device.
  4 *
  5 * Copyright (c) 2014,2015 AMD Corporation.
  6 * Authors: Ken Xue <Ken.Xue@amd.com>
  7 *	Wu, Jeff <Jeff.Wu@amd.com>
  8 */
  9
 10#include <linux/clk-provider.h>
 11#include <linux/platform_data/clk-st.h>
 12#include <linux/platform_device.h>
 13#include <linux/pm_domain.h>
 14#include <linux/clkdev.h>
 15#include <linux/acpi.h>
 16#include <linux/err.h>
 17#include <linux/io.h>
 18#include <linux/pm.h>
 19
 20#include "internal.h"
 21
 22ACPI_MODULE_NAME("acpi_apd");
 23struct apd_private_data;
 24
 25/**
 26 * ACPI_APD_SYSFS : add device attributes in sysfs
 27 * ACPI_APD_PM : attach power domain to device
 28 */
 29#define ACPI_APD_SYSFS	BIT(0)
 30#define ACPI_APD_PM	BIT(1)
 31
 32/**
 33 * struct apd_device_desc - a descriptor for apd device
 34 * @flags: device flags like %ACPI_APD_SYSFS, %ACPI_APD_PM
 35 * @fixed_clk_rate: fixed rate input clock source for acpi device;
 36 *			0 means no fixed rate input clock source
 37 * @setup: a hook routine to set device resource during create platform device
 38 *
 39 * Device description defined as acpi_device_id.driver_data
 40 */
 41struct apd_device_desc {
 42	unsigned int flags;
 43	unsigned int fixed_clk_rate;
 44	struct property_entry *properties;
 45	int (*setup)(struct apd_private_data *pdata);
 46};
 47
 48struct apd_private_data {
 49	struct clk *clk;
 50	struct acpi_device *adev;
 51	const struct apd_device_desc *dev_desc;
 52};
 53
 54#if defined(CONFIG_X86_AMD_PLATFORM_DEVICE) || defined(CONFIG_ARM64)
 55#define APD_ADDR(desc)	((unsigned long)&desc)
 56
 57static int acpi_apd_setup(struct apd_private_data *pdata)
 58{
 59	const struct apd_device_desc *dev_desc = pdata->dev_desc;
 60	struct clk *clk;
 61
 62	if (dev_desc->fixed_clk_rate) {
 63		clk = clk_register_fixed_rate(&pdata->adev->dev,
 64					dev_name(&pdata->adev->dev),
 65					NULL, 0, dev_desc->fixed_clk_rate);
 66		clk_register_clkdev(clk, NULL, dev_name(&pdata->adev->dev));
 67		pdata->clk = clk;
 68	}
 69
 70	return 0;
 71}
 72
 73#ifdef CONFIG_X86_AMD_PLATFORM_DEVICE
 74
 75static int misc_check_res(struct acpi_resource *ares, void *data)
 76{
 77	struct resource res;
 78
 79	return !acpi_dev_resource_memory(ares, &res);
 80}
 81
 82static int st_misc_setup(struct apd_private_data *pdata)
 83{
 84	struct acpi_device *adev = pdata->adev;
 85	struct platform_device *clkdev;
 86	struct st_clk_data *clk_data;
 87	struct resource_entry *rentry;
 88	struct list_head resource_list;
 89	int ret;
 90
 91	clk_data = devm_kzalloc(&adev->dev, sizeof(*clk_data), GFP_KERNEL);
 92	if (!clk_data)
 93		return -ENOMEM;
 94
 95	INIT_LIST_HEAD(&resource_list);
 96	ret = acpi_dev_get_resources(adev, &resource_list, misc_check_res,
 97				     NULL);
 98	if (ret < 0)
 99		return -ENOENT;
100
101	list_for_each_entry(rentry, &resource_list, node) {
102		clk_data->base = devm_ioremap(&adev->dev, rentry->res->start,
103					      resource_size(rentry->res));
104		break;
105	}
106
107	acpi_dev_free_resource_list(&resource_list);
108
109	clkdev = platform_device_register_data(&adev->dev, "clk-st",
110					       PLATFORM_DEVID_NONE, clk_data,
111					       sizeof(*clk_data));
112	return PTR_ERR_OR_ZERO(clkdev);
113}
114
115static const struct apd_device_desc cz_i2c_desc = {
116	.setup = acpi_apd_setup,
117	.fixed_clk_rate = 133000000,
118};
119
120static const struct apd_device_desc wt_i2c_desc = {
121	.setup = acpi_apd_setup,
122	.fixed_clk_rate = 150000000,
123};
124
125static struct property_entry uart_properties[] = {
126	PROPERTY_ENTRY_U32("reg-io-width", 4),
127	PROPERTY_ENTRY_U32("reg-shift", 2),
128	PROPERTY_ENTRY_BOOL("snps,uart-16550-compatible"),
129	{ },
130};
131
132static const struct apd_device_desc cz_uart_desc = {
133	.setup = acpi_apd_setup,
134	.fixed_clk_rate = 48000000,
135	.properties = uart_properties,
136};
137
138static const struct apd_device_desc st_misc_desc = {
139	.setup = st_misc_setup,
140};
141#endif
142
143#ifdef CONFIG_ARM64
144static const struct apd_device_desc xgene_i2c_desc = {
145	.setup = acpi_apd_setup,
146	.fixed_clk_rate = 100000000,
147};
148
149static const struct apd_device_desc vulcan_spi_desc = {
150	.setup = acpi_apd_setup,
151	.fixed_clk_rate = 133000000,
152};
153
154static const struct apd_device_desc hip07_i2c_desc = {
155	.setup = acpi_apd_setup,
156	.fixed_clk_rate = 200000000,
157};
158
159static const struct apd_device_desc hip08_i2c_desc = {
160	.setup = acpi_apd_setup,
161	.fixed_clk_rate = 250000000,
162};
163
164static const struct apd_device_desc thunderx2_i2c_desc = {
165	.setup = acpi_apd_setup,
166	.fixed_clk_rate = 125000000,
167};
168
169static const struct apd_device_desc nxp_i2c_desc = {
170	.setup = acpi_apd_setup,
171	.fixed_clk_rate = 350000000,
172};
173
174static const struct apd_device_desc hip08_spi_desc = {
175	.setup = acpi_apd_setup,
176	.fixed_clk_rate = 250000000,
177};
178#endif
179
180#else
181
182#define APD_ADDR(desc) (0UL)
183
184#endif /* CONFIG_X86_AMD_PLATFORM_DEVICE */
185
186/**
187* Create platform device during acpi scan attach handle.
188* Return value > 0 on success of creating device.
189*/
190static int acpi_apd_create_device(struct acpi_device *adev,
191				   const struct acpi_device_id *id)
192{
193	const struct apd_device_desc *dev_desc = (void *)id->driver_data;
194	struct apd_private_data *pdata;
195	struct platform_device *pdev;
196	int ret;
197
198	if (!dev_desc) {
199		pdev = acpi_create_platform_device(adev, NULL);
200		return IS_ERR_OR_NULL(pdev) ? PTR_ERR(pdev) : 1;
201	}
202
203	pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
204	if (!pdata)
205		return -ENOMEM;
206
207	pdata->adev = adev;
208	pdata->dev_desc = dev_desc;
209
210	if (dev_desc->setup) {
211		ret = dev_desc->setup(pdata);
212		if (ret)
213			goto err_out;
214	}
215
216	adev->driver_data = pdata;
217	pdev = acpi_create_platform_device(adev, dev_desc->properties);
218	if (!IS_ERR_OR_NULL(pdev))
219		return 1;
220
221	ret = PTR_ERR(pdev);
222	adev->driver_data = NULL;
223
224 err_out:
225	kfree(pdata);
226	return ret;
227}
228
229static const struct acpi_device_id acpi_apd_device_ids[] = {
230	/* Generic apd devices */
231#ifdef CONFIG_X86_AMD_PLATFORM_DEVICE
232	{ "AMD0010", APD_ADDR(cz_i2c_desc) },
233	{ "AMDI0010", APD_ADDR(wt_i2c_desc) },
234	{ "AMD0020", APD_ADDR(cz_uart_desc) },
235	{ "AMDI0020", APD_ADDR(cz_uart_desc) },
236	{ "AMD0030", },
237	{ "AMD0040", APD_ADDR(st_misc_desc)},
238#endif
239#ifdef CONFIG_ARM64
240	{ "APMC0D0F", APD_ADDR(xgene_i2c_desc) },
241	{ "BRCM900D", APD_ADDR(vulcan_spi_desc) },
242	{ "CAV900D",  APD_ADDR(vulcan_spi_desc) },
243	{ "CAV9007",  APD_ADDR(thunderx2_i2c_desc) },
244	{ "HISI02A1", APD_ADDR(hip07_i2c_desc) },
245	{ "HISI02A2", APD_ADDR(hip08_i2c_desc) },
246	{ "HISI0173", APD_ADDR(hip08_spi_desc) },
247	{ "NXP0001", APD_ADDR(nxp_i2c_desc) },
248#endif
249	{ }
250};
251
252static struct acpi_scan_handler apd_handler = {
253	.ids = acpi_apd_device_ids,
254	.attach = acpi_apd_create_device,
255};
256
257void __init acpi_apd_init(void)
258{
259	acpi_scan_add_handler(&apd_handler);
260}