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/* SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause */
/*
* AMD MP2 I2C adapter driver
*
* Authors: Shyam Sundar S K <Shyam-sundar.S-k@amd.com>
* Elie Morisse <syniurge@gmail.com>
*/
#ifndef I2C_AMD_PCI_MP2_H
#define I2C_AMD_PCI_MP2_H
#include <linux/i2c.h>
#include <linux/pci.h>
#include <linux/pm_runtime.h>
#define PCI_DEVICE_ID_AMD_MP2 0x15E6
struct amd_i2c_common;
struct amd_mp2_dev;
enum {
/* MP2 C2P Message Registers */
AMD_C2P_MSG0 = 0x10500, /* MP2 Message for I2C0 */
AMD_C2P_MSG1 = 0x10504, /* MP2 Message for I2C1 */
AMD_C2P_MSG2 = 0x10508, /* DRAM Address Lo / Data 0 */
AMD_C2P_MSG3 = 0x1050c, /* DRAM Address HI / Data 1 */
AMD_C2P_MSG4 = 0x10510, /* Data 2 */
AMD_C2P_MSG5 = 0x10514, /* Data 3 */
AMD_C2P_MSG6 = 0x10518, /* Data 4 */
AMD_C2P_MSG7 = 0x1051c, /* Data 5 */
AMD_C2P_MSG8 = 0x10520, /* Data 6 */
AMD_C2P_MSG9 = 0x10524, /* Data 7 */
/* MP2 P2C Message Registers */
AMD_P2C_MSG0 = 0x10680, /* Do not use */
AMD_P2C_MSG1 = 0x10684, /* I2C0 interrupt register */
AMD_P2C_MSG2 = 0x10688, /* I2C1 interrupt register */
AMD_P2C_MSG3 = 0x1068C, /* MP2 debug info */
AMD_P2C_MSG_INTEN = 0x10690, /* MP2 interrupt gen register */
AMD_P2C_MSG_INTSTS = 0x10694, /* Interrupt status */
};
/* Command register data structures */
#define i2c_none (-1)
enum i2c_cmd {
i2c_read = 0,
i2c_write,
i2c_enable,
i2c_disable,
number_of_sensor_discovered,
is_mp2_active,
invalid_cmd = 0xF,
};
enum speed_enum {
speed100k = 0,
speed400k = 1,
speed1000k = 2,
speed1400k = 3,
speed3400k = 4
};
enum mem_type {
use_dram = 0,
use_c2pmsg = 1,
};
/**
* union i2c_cmd_base : bit access of C2P commands
* @i2c_cmd: bit 0..3 i2c R/W command
* @bus_id: bit 4..7 i2c bus index
* @slave_addr: bit 8..15 slave address
* @length: bit 16..27 read/write length
* @i2c_speed: bit 28..30 bus speed
* @mem_type: bit 31 0-DRAM; 1-C2P msg o/p
*/
union i2c_cmd_base {
u32 ul;
struct {
enum i2c_cmd i2c_cmd : 4;
u8 bus_id : 4;
u32 slave_addr : 8;
u32 length : 12;
enum speed_enum i2c_speed : 3;
enum mem_type mem_type : 1;
} s;
};
enum response_type {
invalid_response = 0,
command_success = 1,
command_failed = 2,
};
enum status_type {
i2c_readcomplete_event = 0,
i2c_readfail_event = 1,
i2c_writecomplete_event = 2,
i2c_writefail_event = 3,
i2c_busenable_complete = 4,
i2c_busenable_failed = 5,
i2c_busdisable_complete = 6,
i2c_busdisable_failed = 7,
invalid_data_length = 8,
invalid_slave_address = 9,
invalid_i2cbus_id = 10,
invalid_dram_addr = 11,
invalid_command = 12,
mp2_active = 13,
numberof_sensors_discovered_resp = 14,
i2c_bus_notinitialized
};
/**
* union i2c_event : bit access of P2C events
* @response: bit 0..1 i2c response type
* @status: bit 2..6 status_type
* @mem_type: bit 7 0-DRAM; 1-C2P msg o/p
* @bus_id: bit 8..11 i2c bus id
* @length: bit 12..23 message length
* @slave_addr: bit 24-31 slave address
*/
union i2c_event {
u32 ul;
struct {
enum response_type response : 2;
enum status_type status : 5;
enum mem_type mem_type : 1;
u8 bus_id : 4;
u32 length : 12;
u32 slave_addr : 8;
} r;
};
/**
* struct amd_i2c_common - per bus/i2c adapter context, shared
* between the pci and the platform driver
* @eventval: MP2 event value set by the IRQ handler
* @mp2_dev: MP2 pci device this adapter is part of
* @msg: i2c message
* @cmd_completion: function called by the IRQ handler to signal
* the platform driver
* @reqcmd: requested i2c command type
* @cmd_success: set to true if the MP2 responded to a command with
* the expected status and response type
* @bus_id: bus index
* @i2c_speed: i2c bus speed determined by the slowest slave
* @dma_buf: if msg length > 32, holds the DMA buffer virtual address
* @dma_addr: if msg length > 32, holds the DMA buffer address
*/
struct amd_i2c_common {
union i2c_event eventval;
struct amd_mp2_dev *mp2_dev;
struct i2c_msg *msg;
void (*cmd_completion)(struct amd_i2c_common *i2c_common);
enum i2c_cmd reqcmd;
u8 cmd_success;
u8 bus_id;
enum speed_enum i2c_speed;
u8 *dma_buf;
dma_addr_t dma_addr;
#ifdef CONFIG_PM
int (*suspend)(struct amd_i2c_common *i2c_common);
int (*resume)(struct amd_i2c_common *i2c_common);
#endif /* CONFIG_PM */
};
/**
* struct amd_mp2_dev - per PCI device context
* @pci_dev: PCI driver node
* @busses: MP2 devices may have up to two busses,
* each bus corresponding to an i2c adapter
* @mmio: iommapped registers
* @c2p_lock: controls access to the C2P mailbox shared between
* the two adapters
* @c2p_lock_busid: id of the adapter which locked c2p_lock
*/
struct amd_mp2_dev {
struct pci_dev *pci_dev;
struct amd_i2c_common *busses[2];
void __iomem *mmio;
struct mutex c2p_lock;
u8 c2p_lock_busid;
unsigned int probed;
};
/* PCIe communication driver */
int amd_mp2_rw(struct amd_i2c_common *i2c_common, enum i2c_cmd reqcmd);
int amd_mp2_bus_enable_set(struct amd_i2c_common *i2c_common, bool enable);
void amd_mp2_process_event(struct amd_i2c_common *i2c_common);
void amd_mp2_rw_timeout(struct amd_i2c_common *i2c_common);
int amd_mp2_register_cb(struct amd_i2c_common *i2c_common);
int amd_mp2_unregister_cb(struct amd_i2c_common *i2c_common);
struct amd_mp2_dev *amd_mp2_find_device(void);
static inline void amd_mp2_pm_runtime_get(struct amd_mp2_dev *mp2_dev)
{
pm_runtime_get_sync(&mp2_dev->pci_dev->dev);
}
static inline void amd_mp2_pm_runtime_put(struct amd_mp2_dev *mp2_dev)
{
pm_runtime_mark_last_busy(&mp2_dev->pci_dev->dev);
pm_runtime_put_autosuspend(&mp2_dev->pci_dev->dev);
}
#endif
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