1 // SPDX-License-Identifier: GPL-2.0-only
3 * AMD Secure Processor driver
5 * Copyright (C) 2017-2018 Advanced Micro Devices, Inc.
12 #include <linux/module.h>
13 #include <linux/kernel.h>
14 #include <linux/kthread.h>
15 #include <linux/sched.h>
16 #include <linux/interrupt.h>
17 #include <linux/spinlock.h>
18 #include <linux/spinlock_types.h>
19 #include <linux/types.h>
20 #include <linux/ccp.h>
27 MODULE_LICENSE("GPL");
28 MODULE_VERSION("1.1.0");
29 MODULE_DESCRIPTION("AMD Secure Processor driver");
31 /* List of SPs, SP count, read-write access lock, and access functions
33 * Lock structure: get sp_unit_lock for reading whenever we need to
34 * examine the SP list.
36 static DEFINE_RWLOCK(sp_unit_lock);
37 static LIST_HEAD(sp_units);
39 /* Ever-increasing value to produce unique unit numbers */
40 static atomic_t sp_ordinal;
42 static void sp_add_device(struct sp_device *sp)
46 write_lock_irqsave(&sp_unit_lock, flags);
48 list_add_tail(&sp->entry, &sp_units);
50 write_unlock_irqrestore(&sp_unit_lock, flags);
53 static void sp_del_device(struct sp_device *sp)
57 write_lock_irqsave(&sp_unit_lock, flags);
61 write_unlock_irqrestore(&sp_unit_lock, flags);
64 static irqreturn_t sp_irq_handler(int irq, void *data)
66 struct sp_device *sp = data;
68 if (sp->ccp_irq_handler)
69 sp->ccp_irq_handler(irq, sp->ccp_irq_data);
71 if (sp->psp_irq_handler)
72 sp->psp_irq_handler(irq, sp->psp_irq_data);
77 int sp_request_ccp_irq(struct sp_device *sp, irq_handler_t handler,
78 const char *name, void *data)
82 if ((sp->psp_irq == sp->ccp_irq) && sp->dev_vdata->psp_vdata) {
83 /* Need a common routine to manage all interrupts */
84 sp->ccp_irq_data = data;
85 sp->ccp_irq_handler = handler;
87 if (!sp->irq_registered) {
88 ret = request_irq(sp->ccp_irq, sp_irq_handler, 0,
93 sp->irq_registered = true;
96 /* Each sub-device can manage it's own interrupt */
97 ret = request_irq(sp->ccp_irq, handler, 0, name, data);
105 int sp_request_psp_irq(struct sp_device *sp, irq_handler_t handler,
106 const char *name, void *data)
110 if ((sp->psp_irq == sp->ccp_irq) && sp->dev_vdata->ccp_vdata) {
111 /* Need a common routine to manage all interrupts */
112 sp->psp_irq_data = data;
113 sp->psp_irq_handler = handler;
115 if (!sp->irq_registered) {
116 ret = request_irq(sp->psp_irq, sp_irq_handler, 0,
121 sp->irq_registered = true;
124 /* Each sub-device can manage it's own interrupt */
125 ret = request_irq(sp->psp_irq, handler, 0, name, data);
133 void sp_free_ccp_irq(struct sp_device *sp, void *data)
135 if ((sp->psp_irq == sp->ccp_irq) && sp->dev_vdata->psp_vdata) {
136 /* Using common routine to manage all interrupts */
137 if (!sp->psp_irq_handler) {
138 /* Nothing else using it, so free it */
139 free_irq(sp->ccp_irq, sp);
141 sp->irq_registered = false;
144 sp->ccp_irq_handler = NULL;
145 sp->ccp_irq_data = NULL;
147 /* Each sub-device can manage it's own interrupt */
148 free_irq(sp->ccp_irq, data);
152 void sp_free_psp_irq(struct sp_device *sp, void *data)
154 if ((sp->psp_irq == sp->ccp_irq) && sp->dev_vdata->ccp_vdata) {
155 /* Using common routine to manage all interrupts */
156 if (!sp->ccp_irq_handler) {
157 /* Nothing else using it, so free it */
158 free_irq(sp->psp_irq, sp);
160 sp->irq_registered = false;
163 sp->psp_irq_handler = NULL;
164 sp->psp_irq_data = NULL;
166 /* Each sub-device can manage it's own interrupt */
167 free_irq(sp->psp_irq, data);
172 * sp_alloc_struct - allocate and initialize the sp_device struct
174 * @dev: device struct of the SP
176 struct sp_device *sp_alloc_struct(struct device *dev)
178 struct sp_device *sp;
180 sp = devm_kzalloc(dev, sizeof(*sp), GFP_KERNEL);
185 sp->ord = atomic_inc_return(&sp_ordinal);
186 snprintf(sp->name, SP_MAX_NAME_LEN, "sp-%u", sp->ord);
191 int sp_init(struct sp_device *sp)
195 if (sp->dev_vdata->ccp_vdata)
198 if (sp->dev_vdata->psp_vdata)
203 void sp_destroy(struct sp_device *sp)
205 if (sp->dev_vdata->ccp_vdata)
208 if (sp->dev_vdata->psp_vdata)
214 int sp_suspend(struct sp_device *sp)
218 if (sp->dev_vdata->ccp_vdata) {
219 ret = ccp_dev_suspend(sp);
227 int sp_resume(struct sp_device *sp)
231 if (sp->dev_vdata->ccp_vdata) {
232 ret = ccp_dev_resume(sp);
240 struct sp_device *sp_get_psp_master_device(void)
242 struct sp_device *i, *ret = NULL;
245 write_lock_irqsave(&sp_unit_lock, flags);
246 if (list_empty(&sp_units))
249 list_for_each_entry(i, &sp_units, entry) {
250 if (i->psp_data && i->get_psp_master_device) {
251 ret = i->get_psp_master_device();
257 write_unlock_irqrestore(&sp_unit_lock, flags);
261 static int __init sp_mod_init(void)
270 #ifdef CONFIG_CRYPTO_DEV_SP_PSP
280 ret = sp_platform_init();
290 static void __exit sp_mod_exit(void)
294 #ifdef CONFIG_CRYPTO_DEV_SP_PSP
306 module_init(sp_mod_init);
307 module_exit(sp_mod_exit);