1 /* SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause */ 2 /* 3 * AMD MP2 I2C adapter driver 4 * 5 * Authors: Shyam Sundar S K <Shyam-sundar.S-k@amd.com> 6 * Elie Morisse <syniurge@gmail.com> 7 */ 8 9 #ifndef I2C_AMD_PCI_MP2_H 10 #define I2C_AMD_PCI_MP2_H 11 12 #include <linux/i2c.h> 13 #include <linux/pci.h> 14 #include <linux/pm_runtime.h> 15 16 #define PCI_DEVICE_ID_AMD_MP2 0x15E6 17 18 struct amd_i2c_common; 19 struct amd_mp2_dev; 20 21 enum { 22 /* MP2 C2P Message Registers */ 23 AMD_C2P_MSG0 = 0x10500, /* MP2 Message for I2C0 */ 24 AMD_C2P_MSG1 = 0x10504, /* MP2 Message for I2C1 */ 25 AMD_C2P_MSG2 = 0x10508, /* DRAM Address Lo / Data 0 */ 26 AMD_C2P_MSG3 = 0x1050c, /* DRAM Address HI / Data 1 */ 27 AMD_C2P_MSG4 = 0x10510, /* Data 2 */ 28 AMD_C2P_MSG5 = 0x10514, /* Data 3 */ 29 AMD_C2P_MSG6 = 0x10518, /* Data 4 */ 30 AMD_C2P_MSG7 = 0x1051c, /* Data 5 */ 31 AMD_C2P_MSG8 = 0x10520, /* Data 6 */ 32 AMD_C2P_MSG9 = 0x10524, /* Data 7 */ 33 34 /* MP2 P2C Message Registers */ 35 AMD_P2C_MSG0 = 0x10680, /* Do not use */ 36 AMD_P2C_MSG1 = 0x10684, /* I2C0 interrupt register */ 37 AMD_P2C_MSG2 = 0x10688, /* I2C1 interrupt register */ 38 AMD_P2C_MSG3 = 0x1068C, /* MP2 debug info */ 39 AMD_P2C_MSG_INTEN = 0x10690, /* MP2 interrupt gen register */ 40 AMD_P2C_MSG_INTSTS = 0x10694, /* Interrupt status */ 41 }; 42 43 /* Command register data structures */ 44 45 #define i2c_none (-1) 46 enum i2c_cmd { 47 i2c_read = 0, 48 i2c_write, 49 i2c_enable, 50 i2c_disable, 51 number_of_sensor_discovered, 52 is_mp2_active, 53 invalid_cmd = 0xF, 54 }; 55 56 enum speed_enum { 57 speed100k = 0, 58 speed400k = 1, 59 speed1000k = 2, 60 speed1400k = 3, 61 speed3400k = 4 62 }; 63 64 enum mem_type { 65 use_dram = 0, 66 use_c2pmsg = 1, 67 }; 68 69 /** 70 * union i2c_cmd_base : bit access of C2P commands 71 * @i2c_cmd: bit 0..3 i2c R/W command 72 * @bus_id: bit 4..7 i2c bus index 73 * @slave_addr: bit 8..15 slave address 74 * @length: bit 16..27 read/write length 75 * @i2c_speed: bit 28..30 bus speed 76 * @mem_type: bit 31 0-DRAM; 1-C2P msg o/p 77 */ 78 union i2c_cmd_base { 79 u32 ul; 80 struct { 81 enum i2c_cmd i2c_cmd : 4; 82 u8 bus_id : 4; 83 u32 slave_addr : 8; 84 u32 length : 12; 85 enum speed_enum i2c_speed : 3; 86 enum mem_type mem_type : 1; 87 } s; 88 }; 89 90 enum response_type { 91 invalid_response = 0, 92 command_success = 1, 93 command_failed = 2, 94 }; 95 96 enum status_type { 97 i2c_readcomplete_event = 0, 98 i2c_readfail_event = 1, 99 i2c_writecomplete_event = 2, 100 i2c_writefail_event = 3, 101 i2c_busenable_complete = 4, 102 i2c_busenable_failed = 5, 103 i2c_busdisable_complete = 6, 104 i2c_busdisable_failed = 7, 105 invalid_data_length = 8, 106 invalid_slave_address = 9, 107 invalid_i2cbus_id = 10, 108 invalid_dram_addr = 11, 109 invalid_command = 12, 110 mp2_active = 13, 111 numberof_sensors_discovered_resp = 14, 112 i2c_bus_notinitialized 113 }; 114 115 /** 116 * union i2c_event : bit access of P2C events 117 * @response: bit 0..1 i2c response type 118 * @status: bit 2..6 status_type 119 * @mem_type: bit 7 0-DRAM; 1-C2P msg o/p 120 * @bus_id: bit 8..11 i2c bus id 121 * @length: bit 12..23 message length 122 * @slave_addr: bit 24-31 slave address 123 */ 124 union i2c_event { 125 u32 ul; 126 struct { 127 enum response_type response : 2; 128 enum status_type status : 5; 129 enum mem_type mem_type : 1; 130 u8 bus_id : 4; 131 u32 length : 12; 132 u32 slave_addr : 8; 133 } r; 134 }; 135 136 /** 137 * struct amd_i2c_common - per bus/i2c adapter context, shared 138 * between the pci and the platform driver 139 * @eventval: MP2 event value set by the IRQ handler 140 * @mp2_dev: MP2 pci device this adapter is part of 141 * @msg: i2c message 142 * @cmd_completion: function called by the IRQ handler to signal 143 * the platform driver 144 * @reqcmd: requested i2c command type 145 * @cmd_success: set to true if the MP2 responded to a command with 146 * the expected status and response type 147 * @bus_id: bus index 148 * @i2c_speed: i2c bus speed determined by the slowest slave 149 * @dma_buf: if msg length > 32, holds the DMA buffer virtual address 150 * @dma_addr: if msg length > 32, holds the DMA buffer address 151 */ 152 struct amd_i2c_common { 153 union i2c_event eventval; 154 struct amd_mp2_dev *mp2_dev; 155 struct i2c_msg *msg; 156 void (*cmd_completion)(struct amd_i2c_common *i2c_common); 157 enum i2c_cmd reqcmd; 158 u8 cmd_success; 159 u8 bus_id; 160 enum speed_enum i2c_speed; 161 u8 *dma_buf; 162 dma_addr_t dma_addr; 163 #ifdef CONFIG_PM 164 int (*suspend)(struct amd_i2c_common *i2c_common); 165 int (*resume)(struct amd_i2c_common *i2c_common); 166 #endif /* CONFIG_PM */ 167 }; 168 169 /** 170 * struct amd_mp2_dev - per PCI device context 171 * @pci_dev: PCI driver node 172 * @busses: MP2 devices may have up to two busses, 173 * each bus corresponding to an i2c adapter 174 * @mmio: iommapped registers 175 * @c2p_lock: controls access to the C2P mailbox shared between 176 * the two adapters 177 * @c2p_lock_busid: id of the adapter which locked c2p_lock 178 */ 179 struct amd_mp2_dev { 180 struct pci_dev *pci_dev; 181 struct amd_i2c_common *busses[2]; 182 void __iomem *mmio; 183 struct mutex c2p_lock; 184 u8 c2p_lock_busid; 185 unsigned int probed; 186 }; 187 188 /* PCIe communication driver */ 189 190 int amd_mp2_rw(struct amd_i2c_common *i2c_common, enum i2c_cmd reqcmd); 191 int amd_mp2_bus_enable_set(struct amd_i2c_common *i2c_common, bool enable); 192 193 void amd_mp2_process_event(struct amd_i2c_common *i2c_common); 194 195 void amd_mp2_rw_timeout(struct amd_i2c_common *i2c_common); 196 197 int amd_mp2_register_cb(struct amd_i2c_common *i2c_common); 198 int amd_mp2_unregister_cb(struct amd_i2c_common *i2c_common); 199 200 struct amd_mp2_dev *amd_mp2_find_device(void); 201 202 static inline void amd_mp2_pm_runtime_get(struct amd_mp2_dev *mp2_dev) 203 { 204 pm_runtime_get_sync(&mp2_dev->pci_dev->dev); 205 } 206 207 static inline void amd_mp2_pm_runtime_put(struct amd_mp2_dev *mp2_dev) 208 { 209 pm_runtime_mark_last_busy(&mp2_dev->pci_dev->dev); 210 pm_runtime_put_autosuspend(&mp2_dev->pci_dev->dev); 211 } 212 213 #endif 214