/* SPDX-License-Identifier: GPL-2.0-only */
/*
* AMD Passthru DMA device driver
* - - Based on the CCP driver
*
* Copyright ( C ) 2016 , 2021 Advanced Micro Devices , Inc .
*
* Author : Sanjay R Mehta < sanju . mehta @ amd . com >
* Author : Tom Lendacky < thomas . lendacky @ amd . com >
* Author : Gary R Hook < gary . hook @ amd . com >
*/
#ifndef __PT_DEV_H__
#define __PT_DEV_H__
#include <linux/device.h>
#include <linux/dmaengine.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 "../../virt-dma.h"
#define MAX_PT_NAME_LEN 16
#define MAX_DMAPOOL_NAME_LEN 32
#define MAX_HW_QUEUES 1
#define MAX_CMD_QLEN 100
#define PT_ENGINE_PASSTHRU 5
/* Register Mappings */
#define IRQ_MASK_REG 0 x040
#define IRQ_STATUS_REG 0 x200
#define CMD_Q_ERROR(__qs) ((__qs) & 0 x0000003f)
#define CMD_QUEUE_PRIO_OFFSET 0 x00
#define CMD_REQID_CONFIG_OFFSET 0 x04
#define CMD_TIMEOUT_OFFSET 0 x08
#define CMD_PT_VERSION 0 x10
#define CMD_Q_CONTROL_BASE 0 x0000
#define CMD_Q_TAIL_LO_BASE 0 x0004
#define CMD_Q_HEAD_LO_BASE 0 x0008
#define CMD_Q_INT_ENABLE_BASE 0 x000C
#define CMD_Q_INTERRUPT_STATUS_BASE 0 x0010
#define CMD_Q_STATUS_BASE 0 x0100
#define CMD_Q_INT_STATUS_BASE 0 x0104
#define CMD_Q_DMA_STATUS_BASE 0 x0108
#define CMD_Q_DMA_READ_STATUS_BASE 0 x010C
#define CMD_Q_DMA_WRITE_STATUS_BASE 0 x0110
#define CMD_Q_ABORT_BASE 0 x0114
#define CMD_Q_AX_CACHE_BASE 0 x0118
#define CMD_CONFIG_OFFSET 0 x1120
#define CMD_CLK_GATE_CTL_OFFSET 0 x6004
#define CMD_DESC_DW0_VAL 0 x500012
/* Address offset for virtual queue registers */
#define CMD_Q_STATUS_INCR 0 x1000
/* Bit masks */
#define CMD_CONFIG_REQID 0
#define CMD_TIMEOUT_DISABLE 0
#define CMD_CLK_DYN_GATING_DIS 0
#define CMD_CLK_SW_GATE_MODE 0
#define CMD_CLK_GATE_CTL 0
#define CMD_QUEUE_PRIO GENMASK(2 , 1 )
#define CMD_CONFIG_VHB_EN BIT(0 )
#define CMD_CLK_DYN_GATING_EN BIT(0 )
#define CMD_CLK_HW_GATE_MODE BIT(0 )
#define CMD_CLK_GATE_ON_DELAY BIT(12 )
#define CMD_CLK_GATE_OFF_DELAY BIT(12 )
#define CMD_CLK_GATE_CONFIG (CMD_CLK_GATE_CTL | \
CMD_CLK_HW_GATE_MODE | \
CMD_CLK_GATE_ON_DELAY | \
CMD_CLK_DYN_GATING_EN | \
CMD_CLK_GATE_OFF_DELAY)
#define CMD_Q_LEN 32
#define CMD_Q_RUN BIT(0 )
#define CMD_Q_HALT BIT(1 )
#define CMD_Q_MEM_LOCATION BIT(2 )
#define CMD_Q_SIZE_MASK GENMASK(4 , 0 )
#define CMD_Q_SIZE GENMASK(7 , 3 )
#define CMD_Q_SHIFT GENMASK(1 , 0 )
#define QUEUE_SIZE_VAL ((ffs(CMD_Q_LEN) - 2 ) & \
CMD_Q_SIZE_MASK)
#define Q_PTR_MASK (2 << (QUEUE_SIZE_VAL + 5 ) - 1 )
#define Q_DESC_SIZE sizeof (struct ptdma_desc)
#define Q_SIZE(n) (CMD_Q_LEN * (n))
#define INT_COMPLETION BIT(0 )
#define INT_ERROR BIT(1 )
#define INT_QUEUE_STOPPED BIT(2 )
#define INT_EMPTY_QUEUE BIT(3 )
#define SUPPORTED_INTERRUPTS (INT_COMPLETION | INT_ERROR)
/****** Local Storage Block ******/
#define LSB_START 0
#define LSB_END 127
#define LSB_COUNT (LSB_END - LSB_START + 1 )
#define PT_DMAPOOL_MAX_SIZE 64
#define PT_DMAPOOL_ALIGN BIT(5 )
#define PT_PASSTHRU_BLOCKSIZE 512
struct pt_device;
struct pt_tasklet_data {
struct completion completion;
struct pt_cmd *cmd;
};
/*
* struct pt_passthru_engine - pass - through operation
* without performing DMA mapping
* @ mask : mask to be applied to data
* @ mask_len : length in bytes of mask
* @ src_dma : data to be used for this operation
* @ dst_dma : data produced by this operation
* @ src_len : length in bytes of data used for this operation
*
* Variables required to be set when calling pt_enqueue_cmd ( ) :
* - bit_mod , byte_swap , src , dst , src_len
* - mask , mask_len if bit_mod is not PT_PASSTHRU_BITWISE_NOOP
*/
struct pt_passthru_engine {
dma_addr_t mask;
u32 mask_len; /* In bytes */
dma_addr_t src_dma, dst_dma;
u64 src_len; /* In bytes */
};
/*
* struct pt_cmd - PTDMA operation request
* @ entry : list element
* @ work : work element used for callbacks
* @ pt : PT device to be run on
* @ ret : operation return code
* @ flags : cmd processing flags
* @ engine : PTDMA operation to perform ( passthru )
* @ engine_error : PT engine return code
* @ passthru : engine specific structures , refer to specific engine struct below
* @ callback : operation completion callback function
* @ data : parameter value to be supplied to the callback function
*
* Variables required to be set when calling pt_enqueue_cmd ( ) :
* - engine , callback
* - See the operation structures below for what is required for each
* operation .
*/
struct pt_cmd {
struct list_head entry;
struct work_struct work;
struct pt_device *pt;
int ret;
u32 engine;
u32 engine_error;
struct pt_passthru_engine passthru;
/* Completion callback support */
void (*pt_cmd_callback)(void *data, int err);
void *data;
};
struct pt_dma_desc {
struct virt_dma_desc vd;
struct pt_device *pt;
enum dma_status status;
size_t len;
bool issued_to_hw;
struct pt_cmd pt_cmd;
};
struct pt_dma_chan {
struct virt_dma_chan vc;
struct pt_device *pt;
u32 id;
};
struct pt_cmd_queue {
struct pt_device *pt;
/* Queue dma pool */
struct dma_pool *dma_pool;
/* Queue base address (not necessarily aligned)*/
struct ptdma_desc *qbase;
/* Aligned queue start address (per requirement) */
spinlock_t q_lock ____cacheline_aligned;
unsigned int qidx;
unsigned int qsize;
dma_addr_t qbase_dma;
dma_addr_t qdma_tail;
unsigned int active;
unsigned int suspended;
/* Interrupt flag */
bool int_en;
/* Register addresses for queue */
void __iomem *reg_control;
u32 qcontrol; /* Cached control register */
/* Status values from job */
u32 int_status;
u32 q_status;
u32 q_int_status;
u32 cmd_error;
/* Queue Statistics */
unsigned long total_pt_ops;
} ____cacheline_aligned;
struct pt_device {
struct list_head entry;
unsigned int ord;
char name[MAX_PT_NAME_LEN];
struct device *dev;
/* Bus specific device information */
struct pt_msix *pt_msix;
struct pt_dev_vdata *dev_vdata;
unsigned int pt_irq;
/* I/O area used for device communication */
void __iomem *io_regs;
spinlock_t cmd_lock ____cacheline_aligned;
unsigned int cmd_count;
struct list_head cmd;
/*
* The command queue . This represent the queue available on the
* PTDMA that are available for processing cmds
*/
struct pt_cmd_queue cmd_q;
/* Support for the DMA Engine capabilities */
struct dma_device dma_dev;
struct pt_dma_chan *pt_dma_chan;
struct kmem_cache *dma_desc_cache;
wait_queue_head_t lsb_queue;
/* Device Statistics */
unsigned long total_interrupts;
struct pt_tasklet_data tdata;
int ver;
};
/*
* descriptor for PTDMA commands
* 8 32 - bit words :
* word 0 : function ; engine ; control bits
* word 1 : length of source data
* word 2 : low 32 bits of source pointer
* word 3 : upper 16 bits of source pointer ; source memory type
* word 4 : low 32 bits of destination pointer
* word 5 : upper 16 bits of destination pointer ; destination memory type
* word 6 : reserved 32 bits
* word 7 : reserved 32 bits
*/
#define DWORD0_SOC BIT(0 )
#define DWORD0_IOC BIT(1 )
struct dword3 {
unsigned int src_hi:16 ;
unsigned int src_mem:2 ;
unsigned int lsb_cxt_id:8 ;
unsigned int rsvd1:5 ;
unsigned int fixed:1 ;
};
struct dword5 {
unsigned int dst_hi:16 ;
unsigned int dst_mem:2 ;
unsigned int rsvd1:13 ;
unsigned int fixed:1 ;
};
struct ptdma_desc {
u32 dw0;
u32 length;
u32 src_lo;
struct dword3 dw3;
u32 dst_lo;
struct dword5 dw5;
__le32 rsvd1;
__le32 rsvd2;
};
/* Structure to hold PT device data */
struct pt_dev_vdata {
const unsigned int bar;
};
int pt_dmaengine_register(struct pt_device *pt);
void pt_dmaengine_unregister(struct pt_device *pt);
void ptdma_debugfs_setup(struct pt_device *pt);
int pt_core_init(struct pt_device *pt);
void pt_core_destroy(struct pt_device *pt);
int pt_core_perform_passthru(struct pt_cmd_queue *cmd_q,
struct pt_passthru_engine *pt_engine);
void pt_check_status_trans(struct pt_device *pt, struct pt_cmd_queue *cmd_q);
void pt_start_queue(struct pt_cmd_queue *cmd_q);
void pt_stop_queue(struct pt_cmd_queue *cmd_q);
static inline void pt_core_disable_queue_interrupts(struct pt_device *pt)
{
iowrite32(0 , pt->cmd_q.reg_control + 0 x000C);
}
static inline void pt_core_enable_queue_interrupts(struct pt_device *pt)
{
iowrite32(SUPPORTED_INTERRUPTS, pt->cmd_q.reg_control + 0 x000C);
}
#endif
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