crypto: ccp - Add platform device support for arm64
Add support for the CCP on arm64 as a platform device.
Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
diff --git a/drivers/crypto/Kconfig b/drivers/crypto/Kconfig
index 02f177a..30756bd 100644
--- a/drivers/crypto/Kconfig
+++ b/drivers/crypto/Kconfig
@@ -391,7 +391,7 @@
config CRYPTO_DEV_CCP
bool "Support for AMD Cryptographic Coprocessor"
- depends on X86 && PCI
+ depends on (X86 && PCI) || ARM64
default n
help
The AMD Cryptographic Coprocessor provides hardware support
diff --git a/drivers/crypto/ccp/Makefile b/drivers/crypto/ccp/Makefile
index d3505a0..7f592d8 100644
--- a/drivers/crypto/ccp/Makefile
+++ b/drivers/crypto/ccp/Makefile
@@ -1,6 +1,11 @@
obj-$(CONFIG_CRYPTO_DEV_CCP_DD) += ccp.o
ccp-objs := ccp-dev.o ccp-ops.o
+ifdef CONFIG_X86
ccp-objs += ccp-pci.o
+endif
+ifdef CONFIG_ARM64
+ccp-objs += ccp-platform.o
+endif
obj-$(CONFIG_CRYPTO_DEV_CCP_CRYPTO) += ccp-crypto.o
ccp-crypto-objs := ccp-crypto-main.o \
diff --git a/drivers/crypto/ccp/ccp-dev.c b/drivers/crypto/ccp/ccp-dev.c
index 2c78161..fa1ab10 100644
--- a/drivers/crypto/ccp/ccp-dev.c
+++ b/drivers/crypto/ccp/ccp-dev.c
@@ -20,7 +20,9 @@
#include <linux/delay.h>
#include <linux/hw_random.h>
#include <linux/cpu.h>
+#ifdef CONFIG_X86
#include <asm/cpu_device_id.h>
+#endif
#include <linux/ccp.h>
#include "ccp-dev.h"
@@ -360,6 +362,12 @@
/* Build queue interrupt mask (two interrupts per queue) */
qim |= cmd_q->int_ok | cmd_q->int_err;
+#ifdef CONFIG_ARM64
+ /* For arm64 set the recommended queue cache settings */
+ iowrite32(CACHE_WB_NO_ALLOC, ccp->io_regs + CMD_Q_CACHE_BASE +
+ (CMD_Q_CACHE_INC * i));
+#endif
+
dev_dbg(dev, "queue #%u available\n", i);
}
if (ccp->cmd_q_count == 0) {
@@ -558,12 +566,15 @@
}
#endif
+#ifdef CONFIG_X86
static const struct x86_cpu_id ccp_support[] = {
{ X86_VENDOR_AMD, 22, },
};
+#endif
static int __init ccp_mod_init(void)
{
+#ifdef CONFIG_X86
struct cpuinfo_x86 *cpuinfo = &boot_cpu_data;
int ret;
@@ -589,12 +600,30 @@
break;
}
+#endif
+
+#ifdef CONFIG_ARM64
+ int ret;
+
+ ret = ccp_platform_init();
+ if (ret)
+ return ret;
+
+ /* Don't leave the driver loaded if init failed */
+ if (!ccp_get_device()) {
+ ccp_platform_exit();
+ return -ENODEV;
+ }
+
+ return 0;
+#endif
return -ENODEV;
}
static void __exit ccp_mod_exit(void)
{
+#ifdef CONFIG_X86
struct cpuinfo_x86 *cpuinfo = &boot_cpu_data;
switch (cpuinfo->x86) {
@@ -602,6 +631,11 @@
ccp_pci_exit();
break;
}
+#endif
+
+#ifdef CONFIG_ARM64
+ ccp_platform_exit();
+#endif
}
module_init(ccp_mod_init);
diff --git a/drivers/crypto/ccp/ccp-dev.h b/drivers/crypto/ccp/ccp-dev.h
index 72bf153..1c5651b 100644
--- a/drivers/crypto/ccp/ccp-dev.h
+++ b/drivers/crypto/ccp/ccp-dev.h
@@ -30,6 +30,8 @@
#define TRNG_RETRIES 10
+#define CACHE_WB_NO_ALLOC 0xb7
+
/****** Register Mappings ******/
#define Q_MASK_REG 0x000
@@ -48,7 +50,7 @@
#define CMD_Q_INT_STATUS_BASE 0x214
#define CMD_Q_STATUS_INCR 0x20
-#define CMD_Q_CACHE 0x228
+#define CMD_Q_CACHE_BASE 0x228
#define CMD_Q_CACHE_INC 0x20
#define CMD_Q_ERROR(__qs) ((__qs) & 0x0000003f);
@@ -259,6 +261,9 @@
int ccp_pci_init(void);
void ccp_pci_exit(void);
+int ccp_platform_init(void);
+void ccp_platform_exit(void);
+
struct ccp_device *ccp_alloc_struct(struct device *dev);
int ccp_init(struct ccp_device *ccp);
void ccp_destroy(struct ccp_device *ccp);
diff --git a/drivers/crypto/ccp/ccp-platform.c b/drivers/crypto/ccp/ccp-platform.c
new file mode 100644
index 0000000..65e5829
--- /dev/null
+++ b/drivers/crypto/ccp/ccp-platform.c
@@ -0,0 +1,224 @@
+/*
+ * AMD Cryptographic Coprocessor (CCP) driver
+ *
+ * Copyright (C) 2014 Advanced Micro Devices, Inc.
+ *
+ * Author: Tom Lendacky <thomas.lendacky@amd.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/device.h>
+#include <linux/platform_device.h>
+#include <linux/ioport.h>
+#include <linux/dma-mapping.h>
+#include <linux/kthread.h>
+#include <linux/sched.h>
+#include <linux/interrupt.h>
+#include <linux/spinlock.h>
+#include <linux/delay.h>
+#include <linux/ccp.h>
+
+#include "ccp-dev.h"
+
+
+static int ccp_get_irq(struct ccp_device *ccp)
+{
+ struct device *dev = ccp->dev;
+ struct platform_device *pdev = container_of(dev,
+ struct platform_device, dev);
+ int ret;
+
+ ret = platform_get_irq(pdev, 0);
+ if (ret < 0)
+ return ret;
+
+ ccp->irq = ret;
+ ret = request_irq(ccp->irq, ccp_irq_handler, 0, "ccp", dev);
+ if (ret) {
+ dev_notice(dev, "unable to allocate IRQ (%d)\n", ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+static int ccp_get_irqs(struct ccp_device *ccp)
+{
+ struct device *dev = ccp->dev;
+ int ret;
+
+ ret = ccp_get_irq(ccp);
+ if (!ret)
+ return 0;
+
+ /* Couldn't get an interrupt */
+ dev_notice(dev, "could not enable interrupts (%d)\n", ret);
+
+ return ret;
+}
+
+static void ccp_free_irqs(struct ccp_device *ccp)
+{
+ struct device *dev = ccp->dev;
+
+ free_irq(ccp->irq, dev);
+}
+
+static struct resource *ccp_find_mmio_area(struct ccp_device *ccp)
+{
+ struct device *dev = ccp->dev;
+ struct platform_device *pdev = container_of(dev,
+ struct platform_device, dev);
+ struct resource *ior;
+
+ ior = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (ior && (resource_size(ior) >= 0x800))
+ return ior;
+
+ return NULL;
+}
+
+static int ccp_platform_probe(struct platform_device *pdev)
+{
+ struct ccp_device *ccp;
+ struct device *dev = &pdev->dev;
+ struct resource *ior;
+ int ret;
+
+ ret = -ENOMEM;
+ ccp = ccp_alloc_struct(dev);
+ if (!ccp)
+ goto e_err;
+
+ ccp->dev_specific = NULL;
+ ccp->get_irq = ccp_get_irqs;
+ ccp->free_irq = ccp_free_irqs;
+
+ ior = ccp_find_mmio_area(ccp);
+ ccp->io_map = devm_ioremap_resource(dev, ior);
+ if (IS_ERR(ccp->io_map)) {
+ ret = PTR_ERR(ccp->io_map);
+ goto e_free;
+ }
+ ccp->io_regs = ccp->io_map;
+
+ if (!dev->dma_mask)
+ dev->dma_mask = &dev->coherent_dma_mask;
+ *(dev->dma_mask) = DMA_BIT_MASK(48);
+ dev->coherent_dma_mask = DMA_BIT_MASK(48);
+
+ dev_set_drvdata(dev, ccp);
+
+ ret = ccp_init(ccp);
+ if (ret)
+ goto e_free;
+
+ dev_notice(dev, "enabled\n");
+
+ return 0;
+
+e_free:
+ kfree(ccp);
+
+e_err:
+ dev_notice(dev, "initialization failed\n");
+ return ret;
+}
+
+static int ccp_platform_remove(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct ccp_device *ccp = dev_get_drvdata(dev);
+
+ ccp_destroy(ccp);
+
+ kfree(ccp);
+
+ dev_notice(dev, "disabled\n");
+
+ return 0;
+}
+
+#ifdef CONFIG_PM
+static int ccp_platform_suspend(struct platform_device *pdev,
+ pm_message_t state)
+{
+ struct device *dev = &pdev->dev;
+ struct ccp_device *ccp = dev_get_drvdata(dev);
+ unsigned long flags;
+ unsigned int i;
+
+ spin_lock_irqsave(&ccp->cmd_lock, flags);
+
+ ccp->suspending = 1;
+
+ /* Wake all the queue kthreads to prepare for suspend */
+ for (i = 0; i < ccp->cmd_q_count; i++)
+ wake_up_process(ccp->cmd_q[i].kthread);
+
+ spin_unlock_irqrestore(&ccp->cmd_lock, flags);
+
+ /* Wait for all queue kthreads to say they're done */
+ while (!ccp_queues_suspended(ccp))
+ wait_event_interruptible(ccp->suspend_queue,
+ ccp_queues_suspended(ccp));
+
+ return 0;
+}
+
+static int ccp_platform_resume(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct ccp_device *ccp = dev_get_drvdata(dev);
+ unsigned long flags;
+ unsigned int i;
+
+ spin_lock_irqsave(&ccp->cmd_lock, flags);
+
+ ccp->suspending = 0;
+
+ /* Wake up all the kthreads */
+ for (i = 0; i < ccp->cmd_q_count; i++) {
+ ccp->cmd_q[i].suspended = 0;
+ wake_up_process(ccp->cmd_q[i].kthread);
+ }
+
+ spin_unlock_irqrestore(&ccp->cmd_lock, flags);
+
+ return 0;
+}
+#endif
+
+static const struct of_device_id ccp_platform_ids[] = {
+ { .compatible = "amd,ccp-seattle-v1a" },
+ { },
+};
+
+static struct platform_driver ccp_platform_driver = {
+ .driver = {
+ .name = "AMD Cryptographic Coprocessor",
+ .owner = THIS_MODULE,
+ .of_match_table = ccp_platform_ids,
+ },
+ .probe = ccp_platform_probe,
+ .remove = ccp_platform_remove,
+#ifdef CONFIG_PM
+ .suspend = ccp_platform_suspend,
+ .resume = ccp_platform_resume,
+#endif
+};
+
+int ccp_platform_init(void)
+{
+ return platform_driver_register(&ccp_platform_driver);
+}
+
+void ccp_platform_exit(void)
+{
+ platform_driver_unregister(&ccp_platform_driver);
+}