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>

5 files changed, 270 insertions, 2 deletions

diff --git a/drivers/crypto/Kconfig b/drivers/crypto/Kconfig
index 02f177aeb16c..30756bd1a8c4 100644
--- a/drivers/crypto/Kconfig
+++ b/drivers/crypto/Kconfig
@@ -391,7 +391,7 @@ config CRYPTO_DEV_ATMEL_SHA
 
 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 d3505a018720..7f592d8d07bb 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 2c7816149b01..fa1ab10f960f 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 @@ int ccp_init(struct ccp_device *ccp)
                 /* 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 @@ bool ccp_queues_suspended(struct ccp_device *ccp)
 }
 #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 @@ static int __init ccp_mod_init(void)
 
                 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 @@ static void __exit ccp_mod_exit(void)
                 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 72bf1536b653..1c5651b09506 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 @@ struct ccp_device {
 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 000000000000..65e58291c668
--- /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);
+}