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/*
* AMD Cryptographic Coprocessor (CCP) driver
*
* Copyright (C) 2013 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.
*/
#ifndef __CCP_DEV_H__
#define __CCP_DEV_H__
#include <linux/device.h>
#include <linux/pci.h>
#include <linux/spinlock.h>
#include <linux/mutex.h>
#include <linux/list.h>
#include <linux/wait.h>
#include <linux/dmapool.h>
#include <linux/hw_random.h>
#define IO_OFFSET 0x20000
#define MAX_DMAPOOL_NAME_LEN 32
#define MAX_HW_QUEUES 5
#define MAX_CMD_QLEN 100
#define TRNG_RETRIES 10
/****** Register Mappings ******/
#define Q_MASK_REG 0x000
#define TRNG_OUT_REG 0x00c
#define IRQ_MASK_REG 0x040
#define IRQ_STATUS_REG 0x200
#define DEL_CMD_Q_JOB 0x124
#define DEL_Q_ACTIVE 0x00000200
#define DEL_Q_ID_SHIFT 6
#define CMD_REQ0 0x180
#define CMD_REQ_INCR 0x04
#define CMD_Q_STATUS_BASE 0x210
#define CMD_Q_INT_STATUS_BASE 0x214
#define CMD_Q_STATUS_INCR 0x20
#define CMD_Q_CACHE 0x228
#define CMD_Q_CACHE_INC 0x20
#define CMD_Q_ERROR(__qs) ((__qs) & 0x0000003f);
#define CMD_Q_DEPTH(__qs) (((__qs) >> 12) & 0x0000000f);
/****** REQ0 Related Values ******/
#define REQ0_WAIT_FOR_WRITE 0x00000004
#define REQ0_INT_ON_COMPLETE 0x00000002
#define REQ0_STOP_ON_COMPLETE 0x00000001
#define REQ0_CMD_Q_SHIFT 9
#define REQ0_JOBID_SHIFT 3
/****** REQ1 Related Values ******/
#define REQ1_PROTECT_SHIFT 27
#define REQ1_ENGINE_SHIFT 23
#define REQ1_KEY_KSB_SHIFT 2
#define REQ1_EOM 0x00000002
#define REQ1_INIT 0x00000001
/* AES Related Values */
#define REQ1_AES_TYPE_SHIFT 21
#define REQ1_AES_MODE_SHIFT 18
#define REQ1_AES_ACTION_SHIFT 17
#define REQ1_AES_CFB_SIZE_SHIFT 10
/* XTS-AES Related Values */
#define REQ1_XTS_AES_SIZE_SHIFT 10
/* SHA Related Values */
#define REQ1_SHA_TYPE_SHIFT 21
/* RSA Related Values */
#define REQ1_RSA_MOD_SIZE_SHIFT 10
/* Pass-Through Related Values */
#define REQ1_PT_BW_SHIFT 12
#define REQ1_PT_BS_SHIFT 10
/* ECC Related Values */
#define REQ1_ECC_AFFINE_CONVERT 0x00200000
#define REQ1_ECC_FUNCTION_SHIFT 18
/****** REQ4 Related Values ******/
#define REQ4_KSB_SHIFT 18
#define REQ4_MEMTYPE_SHIFT 16
/****** REQ6 Related Values ******/
#define REQ6_MEMTYPE_SHIFT 16
/****** Key Storage Block ******/
#define KSB_START 77
#define KSB_END 127
#define KSB_COUNT (KSB_END - KSB_START + 1)
#define CCP_KSB_BITS 256
#define CCP_KSB_BYTES 32
#define CCP_JOBID_MASK 0x0000003f
#define CCP_DMAPOOL_MAX_SIZE 64
#define CCP_DMAPOOL_ALIGN (1 << 5)
#define CCP_REVERSE_BUF_SIZE 64
#define CCP_AES_KEY_KSB_COUNT 1
#define CCP_AES_CTX_KSB_COUNT 1
#define CCP_XTS_AES_KEY_KSB_COUNT 1
#define CCP_XTS_AES_CTX_KSB_COUNT 1
#define CCP_SHA_KSB_COUNT 1
#define CCP_RSA_MAX_WIDTH 4096
#define CCP_PASSTHRU_BLOCKSIZE 256
#define CCP_PASSTHRU_MASKSIZE 32
#define CCP_PASSTHRU_KSB_COUNT 1
#define CCP_ECC_MODULUS_BYTES 48 /* 384-bits */
#define CCP_ECC_MAX_OPERANDS 6
#define CCP_ECC_MAX_OUTPUTS 3
#define CCP_ECC_SRC_BUF_SIZE 448
#define CCP_ECC_DST_BUF_SIZE 192
#define CCP_ECC_OPERAND_SIZE 64
#define CCP_ECC_OUTPUT_SIZE 64
#define CCP_ECC_RESULT_OFFSET 60
#define CCP_ECC_RESULT_SUCCESS 0x0001
struct ccp_device;
struct ccp_cmd;
struct ccp_cmd_queue {
struct ccp_device *ccp;
/* Queue identifier */
u32 id;
/* Queue dma pool */
struct dma_pool *dma_pool;
/* Queue reserved KSB regions */
u32 ksb_key;
u32 ksb_ctx;
/* Queue processing thread */
struct task_struct *kthread;
unsigned int active;
unsigned int suspended;
/* Number of free command slots available */
unsigned int free_slots;
/* Interrupt masks */
u32 int_ok;
u32 int_err;
/* Register addresses for queue */
void __iomem *reg_status;
void __iomem *reg_int_status;
/* Status values from job */
u32 int_status;
u32 q_status;
u32 q_int_status;
u32 cmd_error;
/* Interrupt wait queue */
wait_queue_head_t int_queue;
unsigned int int_rcvd;
} ____cacheline_aligned;
struct ccp_device {
struct device *dev;
/*
* Bus specific device information
*/
void *dev_specific;
int (*get_irq)(struct ccp_device *ccp);
void (*free_irq)(struct ccp_device *ccp);
/*
* I/O area used for device communication. The register mapping
* starts at an offset into the mapped bar.
* The CMD_REQx registers and the Delete_Cmd_Queue_Job register
* need to be protected while a command queue thread is accessing
* them.
*/
struct mutex req_mutex ____cacheline_aligned;
void __iomem *io_map;
void __iomem *io_regs;
/*
* Master lists that all cmds are queued on. Because there can be
* more than one CCP command queue that can process a cmd a separate
* backlog list is neeeded so that the backlog completion call
* completes before the cmd is available for execution.
*/
spinlock_t cmd_lock ____cacheline_aligned;
unsigned int cmd_count;
struct list_head cmd;
struct list_head backlog;
/*
* The command queues. These represent the queues available on the
* CCP that are available for processing cmds
*/
struct ccp_cmd_queue cmd_q[MAX_HW_QUEUES];
unsigned int cmd_q_count;
/*
* Support for the CCP True RNG
*/
struct hwrng hwrng;
unsigned int hwrng_retries;
/*
* A counter used to generate job-ids for cmds submitted to the CCP
*/
atomic_t current_id ____cacheline_aligned;
/*
* The CCP uses key storage blocks (KSB) to maintain context for certain
* operations. To prevent multiple cmds from using the same KSB range
* a command queue reserves a KSB range for the duration of the cmd.
* Each queue, will however, reserve 2 KSB blocks for operations that
* only require single KSB entries (eg. AES context/iv and key) in order
* to avoid allocation contention. This will reserve at most 10 KSB
* entries, leaving 40 KSB entries available for dynamic allocation.
*/
struct mutex ksb_mutex ____cacheline_aligned;
DECLARE_BITMAP(ksb, KSB_COUNT);
wait_queue_head_t ksb_queue;
unsigned int ksb_avail;
unsigned int ksb_count;
u32 ksb_start;
/* Suspend support */
unsigned int suspending;
wait_queue_head_t suspend_queue;
};
int ccp_pci_init(void);
void ccp_pci_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);
bool ccp_queues_suspended(struct ccp_device *ccp);
irqreturn_t ccp_irq_handler(int irq, void *data);
int ccp_run_cmd(struct ccp_cmd_queue *cmd_q, struct ccp_cmd *cmd);
#endif
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