1 #include <linux/atomic.h>
3 #include <linux/delay.h>
4 #include <linux/device.h>
7 #include <linux/kernel.h>
10 /* Register offsets */
13 #define SW_TWSI_EXT 0x18
15 /* Controller command patterns */
16 #define SW_TWSI_V BIT_ULL(63) /* Valid bit */
17 #define SW_TWSI_EIA BIT_ULL(61) /* Extended internal address */
18 #define SW_TWSI_R BIT_ULL(56) /* Result or read bit */
19 #define SW_TWSI_SOVR BIT_ULL(55) /* Size override */
20 #define SW_TWSI_SIZE_SHIFT 52
21 #define SW_TWSI_ADDR_SHIFT 40
22 #define SW_TWSI_IA_SHIFT 32 /* Internal address */
24 /* Controller opcode word (bits 60:57) */
25 #define SW_TWSI_OP_SHIFT 57
26 #define SW_TWSI_OP_7 (0ULL << SW_TWSI_OP_SHIFT)
27 #define SW_TWSI_OP_7_IA (1ULL << SW_TWSI_OP_SHIFT)
28 #define SW_TWSI_OP_10 (2ULL << SW_TWSI_OP_SHIFT)
29 #define SW_TWSI_OP_10_IA (3ULL << SW_TWSI_OP_SHIFT)
30 #define SW_TWSI_OP_TWSI_CLK (4ULL << SW_TWSI_OP_SHIFT)
31 #define SW_TWSI_OP_EOP (6ULL << SW_TWSI_OP_SHIFT) /* Extended opcode */
33 /* Controller extended opcode word (bits 34:32) */
34 #define SW_TWSI_EOP_SHIFT 32
35 #define SW_TWSI_EOP_TWSI_DATA (SW_TWSI_OP_EOP | 1ULL << SW_TWSI_EOP_SHIFT)
36 #define SW_TWSI_EOP_TWSI_CTL (SW_TWSI_OP_EOP | 2ULL << SW_TWSI_EOP_SHIFT)
37 #define SW_TWSI_EOP_TWSI_CLKCTL (SW_TWSI_OP_EOP | 3ULL << SW_TWSI_EOP_SHIFT)
38 #define SW_TWSI_EOP_TWSI_STAT (SW_TWSI_OP_EOP | 3ULL << SW_TWSI_EOP_SHIFT)
39 #define SW_TWSI_EOP_TWSI_RST (SW_TWSI_OP_EOP | 7ULL << SW_TWSI_EOP_SHIFT)
41 /* Controller command and status bits */
42 #define TWSI_CTL_CE 0x80 /* High level controller enable */
43 #define TWSI_CTL_ENAB 0x40 /* Bus enable */
44 #define TWSI_CTL_STA 0x20 /* Master-mode start, HW clears when done */
45 #define TWSI_CTL_STP 0x10 /* Master-mode stop, HW clears when done */
46 #define TWSI_CTL_IFLG 0x08 /* HW event, SW writes 0 to ACK */
47 #define TWSI_CTL_AAK 0x04 /* Assert ACK */
50 #define STAT_ERROR 0x00
51 #define STAT_START 0x08
52 #define STAT_REP_START 0x10
53 #define STAT_TXADDR_ACK 0x18
54 #define STAT_TXADDR_NAK 0x20
55 #define STAT_TXDATA_ACK 0x28
56 #define STAT_TXDATA_NAK 0x30
57 #define STAT_LOST_ARB_38 0x38
58 #define STAT_RXADDR_ACK 0x40
59 #define STAT_RXADDR_NAK 0x48
60 #define STAT_RXDATA_ACK 0x50
61 #define STAT_RXDATA_NAK 0x58
62 #define STAT_SLAVE_60 0x60
63 #define STAT_LOST_ARB_68 0x68
64 #define STAT_SLAVE_70 0x70
65 #define STAT_LOST_ARB_78 0x78
66 #define STAT_SLAVE_80 0x80
67 #define STAT_SLAVE_88 0x88
68 #define STAT_GENDATA_ACK 0x90
69 #define STAT_GENDATA_NAK 0x98
70 #define STAT_SLAVE_A0 0xA0
71 #define STAT_SLAVE_A8 0xA8
72 #define STAT_LOST_ARB_B0 0xB0
73 #define STAT_SLAVE_LOST 0xB8
74 #define STAT_SLAVE_NAK 0xC0
75 #define STAT_SLAVE_ACK 0xC8
76 #define STAT_AD2W_ACK 0xD0
77 #define STAT_AD2W_NAK 0xD8
78 #define STAT_IDLE 0xF8
81 #define TWSI_INT_ST_INT BIT_ULL(0)
82 #define TWSI_INT_TS_INT BIT_ULL(1)
83 #define TWSI_INT_CORE_INT BIT_ULL(2)
84 #define TWSI_INT_ST_EN BIT_ULL(4)
85 #define TWSI_INT_TS_EN BIT_ULL(5)
86 #define TWSI_INT_CORE_EN BIT_ULL(6)
87 #define TWSI_INT_SDA_OVR BIT_ULL(8)
88 #define TWSI_INT_SCL_OVR BIT_ULL(9)
89 #define TWSI_INT_SDA BIT_ULL(10)
90 #define TWSI_INT_SCL BIT_ULL(11)
92 #define I2C_OCTEON_EVENT_WAIT 80 /* microseconds */
95 wait_queue_head_t queue;
96 struct i2c_adapter adap;
98 int hlc_irq; /* For cn7890 only */
101 void __iomem *twsi_base;
104 bool broken_irq_mode;
105 bool broken_irq_check;
106 void (*int_enable)(struct octeon_i2c *);
107 void (*int_disable)(struct octeon_i2c *);
108 void (*hlc_int_enable)(struct octeon_i2c *);
109 void (*hlc_int_disable)(struct octeon_i2c *);
110 atomic_t int_enable_cnt;
111 atomic_t hlc_int_enable_cnt;
114 static inline void octeon_i2c_writeq_flush(u64 val, void __iomem *addr)
116 __raw_writeq(val, addr);
117 __raw_readq(addr); /* wait for write to land */
121 * octeon_i2c_reg_write - write an I2C core register
122 * @i2c: The struct octeon_i2c
123 * @eop_reg: Register selector
124 * @data: Value to be written
126 * The I2C core registers are accessed indirectly via the SW_TWSI CSR.
128 static inline void octeon_i2c_reg_write(struct octeon_i2c *i2c, u64 eop_reg, u8 data)
132 __raw_writeq(SW_TWSI_V | eop_reg | data, i2c->twsi_base + SW_TWSI);
134 tmp = __raw_readq(i2c->twsi_base + SW_TWSI);
135 } while ((tmp & SW_TWSI_V) != 0);
138 #define octeon_i2c_ctl_write(i2c, val) \
139 octeon_i2c_reg_write(i2c, SW_TWSI_EOP_TWSI_CTL, val)
140 #define octeon_i2c_data_write(i2c, val) \
141 octeon_i2c_reg_write(i2c, SW_TWSI_EOP_TWSI_DATA, val)
144 * octeon_i2c_reg_read - read lower bits of an I2C core register
145 * @i2c: The struct octeon_i2c
146 * @eop_reg: Register selector
150 * The I2C core registers are accessed indirectly via the SW_TWSI CSR.
152 static inline u8 octeon_i2c_reg_read(struct octeon_i2c *i2c, u64 eop_reg)
156 __raw_writeq(SW_TWSI_V | eop_reg | SW_TWSI_R, i2c->twsi_base + SW_TWSI);
158 tmp = __raw_readq(i2c->twsi_base + SW_TWSI);
159 } while ((tmp & SW_TWSI_V) != 0);
164 #define octeon_i2c_ctl_read(i2c) \
165 octeon_i2c_reg_read(i2c, SW_TWSI_EOP_TWSI_CTL)
166 #define octeon_i2c_data_read(i2c) \
167 octeon_i2c_reg_read(i2c, SW_TWSI_EOP_TWSI_DATA)
168 #define octeon_i2c_stat_read(i2c) \
169 octeon_i2c_reg_read(i2c, SW_TWSI_EOP_TWSI_STAT)
172 * octeon_i2c_read_int - read the TWSI_INT register
173 * @i2c: The struct octeon_i2c
175 * Returns the value of the register.
177 static inline u64 octeon_i2c_read_int(struct octeon_i2c *i2c)
179 return __raw_readq(i2c->twsi_base + TWSI_INT);
183 * octeon_i2c_write_int - write the TWSI_INT register
184 * @i2c: The struct octeon_i2c
185 * @data: Value to be written
187 static inline void octeon_i2c_write_int(struct octeon_i2c *i2c, u64 data)
189 octeon_i2c_writeq_flush(data, i2c->twsi_base + TWSI_INT);
193 irqreturn_t octeon_i2c_isr(int irq, void *dev_id);
194 int octeon_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num);
195 int octeon_i2c_init_lowlevel(struct octeon_i2c *i2c);
196 void octeon_i2c_set_clock(struct octeon_i2c *i2c);
197 extern struct i2c_bus_recovery_info octeon_i2c_recovery_info;