2 * AMD Cryptographic Coprocessor (CCP) driver
4 * Copyright (C) 2014 Advanced Micro Devices, Inc.
6 * Author: Tom Lendacky <thomas.lendacky@amd.com>
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
13 #include <linux/module.h>
14 #include <linux/kernel.h>
15 #include <linux/device.h>
16 #include <linux/platform_device.h>
17 #include <linux/ioport.h>
18 #include <linux/dma-mapping.h>
19 #include <linux/kthread.h>
20 #include <linux/sched.h>
21 #include <linux/interrupt.h>
22 #include <linux/spinlock.h>
23 #include <linux/delay.h>
24 #include <linux/ccp.h>
26 #include <linux/of_address.h>
27 #include <linux/acpi.h>
36 static int ccp_get_irq(struct ccp_device
*ccp
)
38 struct device
*dev
= ccp
->dev
;
39 struct platform_device
*pdev
= container_of(dev
,
40 struct platform_device
, dev
);
43 ret
= platform_get_irq(pdev
, 0);
48 ret
= request_irq(ccp
->irq
, ccp_irq_handler
, 0, "ccp", dev
);
50 dev_notice(dev
, "unable to allocate IRQ (%d)\n", ret
);
57 static int ccp_get_irqs(struct ccp_device
*ccp
)
59 struct device
*dev
= ccp
->dev
;
62 ret
= ccp_get_irq(ccp
);
66 /* Couldn't get an interrupt */
67 dev_notice(dev
, "could not enable interrupts (%d)\n", ret
);
72 static void ccp_free_irqs(struct ccp_device
*ccp
)
74 struct device
*dev
= ccp
->dev
;
76 free_irq(ccp
->irq
, dev
);
79 static struct resource
*ccp_find_mmio_area(struct ccp_device
*ccp
)
81 struct device
*dev
= ccp
->dev
;
82 struct platform_device
*pdev
= container_of(dev
,
83 struct platform_device
, dev
);
86 ior
= platform_get_resource(pdev
, IORESOURCE_MEM
, 0);
87 if (ior
&& (resource_size(ior
) >= 0x800))
93 static int ccp_platform_probe(struct platform_device
*pdev
)
95 struct ccp_device
*ccp
;
96 struct ccp_platform
*ccp_platform
;
97 struct device
*dev
= &pdev
->dev
;
98 struct acpi_device
*adev
= ACPI_COMPANION(dev
);
103 ccp
= ccp_alloc_struct(dev
);
107 ccp_platform
= devm_kzalloc(dev
, sizeof(*ccp_platform
), GFP_KERNEL
);
111 ccp
->dev_specific
= ccp_platform
;
112 ccp
->get_irq
= ccp_get_irqs
;
113 ccp
->free_irq
= ccp_free_irqs
;
115 ccp_platform
->use_acpi
= (!adev
|| acpi_disabled
) ? 0 : 1;
117 ior
= ccp_find_mmio_area(ccp
);
118 ccp
->io_map
= devm_ioremap_resource(dev
, ior
);
119 if (IS_ERR(ccp
->io_map
)) {
120 ret
= PTR_ERR(ccp
->io_map
);
123 ccp
->io_regs
= ccp
->io_map
;
125 ret
= dma_set_mask_and_coherent(dev
, DMA_BIT_MASK(48));
127 dev_err(dev
, "dma_set_mask_and_coherent failed (%d)\n", ret
);
131 ccp_platform
->coherent
= device_dma_is_coherent(ccp
->dev
);
132 if (ccp_platform
->coherent
)
133 ccp
->axcache
= CACHE_WB_NO_ALLOC
;
135 ccp
->axcache
= CACHE_NONE
;
137 dev_set_drvdata(dev
, ccp
);
143 dev_notice(dev
, "enabled\n");
148 dev_notice(dev
, "initialization failed\n");
152 static int ccp_platform_remove(struct platform_device
*pdev
)
154 struct device
*dev
= &pdev
->dev
;
155 struct ccp_device
*ccp
= dev_get_drvdata(dev
);
159 dev_notice(dev
, "disabled\n");
165 static int ccp_platform_suspend(struct platform_device
*pdev
,
168 struct device
*dev
= &pdev
->dev
;
169 struct ccp_device
*ccp
= dev_get_drvdata(dev
);
173 spin_lock_irqsave(&ccp
->cmd_lock
, flags
);
177 /* Wake all the queue kthreads to prepare for suspend */
178 for (i
= 0; i
< ccp
->cmd_q_count
; i
++)
179 wake_up_process(ccp
->cmd_q
[i
].kthread
);
181 spin_unlock_irqrestore(&ccp
->cmd_lock
, flags
);
183 /* Wait for all queue kthreads to say they're done */
184 while (!ccp_queues_suspended(ccp
))
185 wait_event_interruptible(ccp
->suspend_queue
,
186 ccp_queues_suspended(ccp
));
191 static int ccp_platform_resume(struct platform_device
*pdev
)
193 struct device
*dev
= &pdev
->dev
;
194 struct ccp_device
*ccp
= dev_get_drvdata(dev
);
198 spin_lock_irqsave(&ccp
->cmd_lock
, flags
);
202 /* Wake up all the kthreads */
203 for (i
= 0; i
< ccp
->cmd_q_count
; i
++) {
204 ccp
->cmd_q
[i
].suspended
= 0;
205 wake_up_process(ccp
->cmd_q
[i
].kthread
);
208 spin_unlock_irqrestore(&ccp
->cmd_lock
, flags
);
215 static const struct acpi_device_id ccp_acpi_match
[] = {
219 MODULE_DEVICE_TABLE(acpi
, ccp_acpi_match
);
223 static const struct of_device_id ccp_of_match
[] = {
224 { .compatible
= "amd,ccp-seattle-v1a" },
227 MODULE_DEVICE_TABLE(of
, ccp_of_match
);
230 static struct platform_driver ccp_platform_driver
= {
232 .name
= "AMD Cryptographic Coprocessor",
234 .acpi_match_table
= ccp_acpi_match
,
237 .of_match_table
= ccp_of_match
,
240 .probe
= ccp_platform_probe
,
241 .remove
= ccp_platform_remove
,
243 .suspend
= ccp_platform_suspend
,
244 .resume
= ccp_platform_resume
,
248 int ccp_platform_init(void)
250 return platform_driver_register(&ccp_platform_driver
);
253 void ccp_platform_exit(void)
255 platform_driver_unregister(&ccp_platform_driver
);