1 #include <linux/atomic.h>
3 #include <linux/delay.h>
4 #include <linux/device.h>
6 #include <linux/i2c-smbus.h>
8 #include <linux/kernel.h>
10 /* Controller command patterns */
11 #define SW_TWSI_V BIT_ULL(63) /* Valid bit */
12 #define SW_TWSI_EIA BIT_ULL(61) /* Extended internal address */
13 #define SW_TWSI_R BIT_ULL(56) /* Result or read bit */
14 #define SW_TWSI_SOVR BIT_ULL(55) /* Size override */
15 #define SW_TWSI_SIZE_SHIFT 52
16 #define SW_TWSI_ADDR_SHIFT 40
17 #define SW_TWSI_IA_SHIFT 32 /* Internal address */
19 /* Controller opcode word (bits 60:57) */
20 #define SW_TWSI_OP_SHIFT 57
21 #define SW_TWSI_OP_7 (0ULL << SW_TWSI_OP_SHIFT)
22 #define SW_TWSI_OP_7_IA (1ULL << SW_TWSI_OP_SHIFT)
23 #define SW_TWSI_OP_10 (2ULL << SW_TWSI_OP_SHIFT)
24 #define SW_TWSI_OP_10_IA (3ULL << SW_TWSI_OP_SHIFT)
25 #define SW_TWSI_OP_TWSI_CLK (4ULL << SW_TWSI_OP_SHIFT)
26 #define SW_TWSI_OP_EOP (6ULL << SW_TWSI_OP_SHIFT) /* Extended opcode */
28 /* Controller extended opcode word (bits 34:32) */
29 #define SW_TWSI_EOP_SHIFT 32
30 #define SW_TWSI_EOP_TWSI_DATA (SW_TWSI_OP_EOP | 1ULL << SW_TWSI_EOP_SHIFT)
31 #define SW_TWSI_EOP_TWSI_CTL (SW_TWSI_OP_EOP | 2ULL << SW_TWSI_EOP_SHIFT)
32 #define SW_TWSI_EOP_TWSI_CLKCTL (SW_TWSI_OP_EOP | 3ULL << SW_TWSI_EOP_SHIFT)
33 #define SW_TWSI_EOP_TWSI_STAT (SW_TWSI_OP_EOP | 3ULL << SW_TWSI_EOP_SHIFT)
34 #define SW_TWSI_EOP_TWSI_RST (SW_TWSI_OP_EOP | 7ULL << SW_TWSI_EOP_SHIFT)
36 /* Controller command and status bits */
37 #define TWSI_CTL_CE 0x80 /* High level controller enable */
38 #define TWSI_CTL_ENAB 0x40 /* Bus enable */
39 #define TWSI_CTL_STA 0x20 /* Master-mode start, HW clears when done */
40 #define TWSI_CTL_STP 0x10 /* Master-mode stop, HW clears when done */
41 #define TWSI_CTL_IFLG 0x08 /* HW event, SW writes 0 to ACK */
42 #define TWSI_CTL_AAK 0x04 /* Assert ACK */
45 #define STAT_ERROR 0x00
46 #define STAT_START 0x08
47 #define STAT_REP_START 0x10
48 #define STAT_TXADDR_ACK 0x18
49 #define STAT_TXADDR_NAK 0x20
50 #define STAT_TXDATA_ACK 0x28
51 #define STAT_TXDATA_NAK 0x30
52 #define STAT_LOST_ARB_38 0x38
53 #define STAT_RXADDR_ACK 0x40
54 #define STAT_RXADDR_NAK 0x48
55 #define STAT_RXDATA_ACK 0x50
56 #define STAT_RXDATA_NAK 0x58
57 #define STAT_SLAVE_60 0x60
58 #define STAT_LOST_ARB_68 0x68
59 #define STAT_SLAVE_70 0x70
60 #define STAT_LOST_ARB_78 0x78
61 #define STAT_SLAVE_80 0x80
62 #define STAT_SLAVE_88 0x88
63 #define STAT_GENDATA_ACK 0x90
64 #define STAT_GENDATA_NAK 0x98
65 #define STAT_SLAVE_A0 0xA0
66 #define STAT_SLAVE_A8 0xA8
67 #define STAT_LOST_ARB_B0 0xB0
68 #define STAT_SLAVE_LOST 0xB8
69 #define STAT_SLAVE_NAK 0xC0
70 #define STAT_SLAVE_ACK 0xC8
71 #define STAT_AD2W_ACK 0xD0
72 #define STAT_AD2W_NAK 0xD8
73 #define STAT_IDLE 0xF8
76 #define TWSI_INT_ST_INT BIT_ULL(0)
77 #define TWSI_INT_TS_INT BIT_ULL(1)
78 #define TWSI_INT_CORE_INT BIT_ULL(2)
79 #define TWSI_INT_ST_EN BIT_ULL(4)
80 #define TWSI_INT_TS_EN BIT_ULL(5)
81 #define TWSI_INT_CORE_EN BIT_ULL(6)
82 #define TWSI_INT_SDA_OVR BIT_ULL(8)
83 #define TWSI_INT_SCL_OVR BIT_ULL(9)
84 #define TWSI_INT_SDA BIT_ULL(10)
85 #define TWSI_INT_SCL BIT_ULL(11)
87 #define I2C_OCTEON_EVENT_WAIT 80 /* microseconds */
89 /* Register offsets */
90 struct octeon_i2c_reg_offset {
92 unsigned int twsi_int;
93 unsigned int sw_twsi_ext;
96 #define SW_TWSI(x) (x->roff.sw_twsi)
97 #define TWSI_INT(x) (x->roff.twsi_int)
98 #define SW_TWSI_EXT(x) (x->roff.sw_twsi_ext)
101 wait_queue_head_t queue;
102 struct i2c_adapter adap;
103 struct octeon_i2c_reg_offset roff;
106 int hlc_irq; /* For cn7890 only */
109 void __iomem *twsi_base;
112 bool broken_irq_mode;
113 bool broken_irq_check;
114 void (*int_enable)(struct octeon_i2c *);
115 void (*int_disable)(struct octeon_i2c *);
116 void (*hlc_int_enable)(struct octeon_i2c *);
117 void (*hlc_int_disable)(struct octeon_i2c *);
118 atomic_t int_enable_cnt;
119 atomic_t hlc_int_enable_cnt;
120 struct i2c_smbus_alert_setup alert_data;
121 struct i2c_client *ara;
124 static inline void octeon_i2c_writeq_flush(u64 val, void __iomem *addr)
126 __raw_writeq(val, addr);
127 __raw_readq(addr); /* wait for write to land */
131 * octeon_i2c_reg_write - write an I2C core register
132 * @i2c: The struct octeon_i2c
133 * @eop_reg: Register selector
134 * @data: Value to be written
136 * The I2C core registers are accessed indirectly via the SW_TWSI CSR.
138 static inline void octeon_i2c_reg_write(struct octeon_i2c *i2c, u64 eop_reg, u8 data)
143 __raw_writeq(SW_TWSI_V | eop_reg | data, i2c->twsi_base + SW_TWSI(i2c));
145 tmp = __raw_readq(i2c->twsi_base + SW_TWSI(i2c));
148 } while ((tmp & SW_TWSI_V) != 0);
151 #define octeon_i2c_ctl_write(i2c, val) \
152 octeon_i2c_reg_write(i2c, SW_TWSI_EOP_TWSI_CTL, val)
153 #define octeon_i2c_data_write(i2c, val) \
154 octeon_i2c_reg_write(i2c, SW_TWSI_EOP_TWSI_DATA, val)
157 * octeon_i2c_reg_read - read lower bits of an I2C core register
158 * @i2c: The struct octeon_i2c
159 * @eop_reg: Register selector
163 * The I2C core registers are accessed indirectly via the SW_TWSI CSR.
165 static inline int octeon_i2c_reg_read(struct octeon_i2c *i2c, u64 eop_reg,
171 __raw_writeq(SW_TWSI_V | eop_reg | SW_TWSI_R, i2c->twsi_base + SW_TWSI(i2c));
173 tmp = __raw_readq(i2c->twsi_base + SW_TWSI(i2c));
175 /* signal that the returned data is invalid */
180 } while ((tmp & SW_TWSI_V) != 0);
185 #define octeon_i2c_ctl_read(i2c) \
186 octeon_i2c_reg_read(i2c, SW_TWSI_EOP_TWSI_CTL, NULL)
187 #define octeon_i2c_data_read(i2c, error) \
188 octeon_i2c_reg_read(i2c, SW_TWSI_EOP_TWSI_DATA, error)
189 #define octeon_i2c_stat_read(i2c) \
190 octeon_i2c_reg_read(i2c, SW_TWSI_EOP_TWSI_STAT, NULL)
193 * octeon_i2c_read_int - read the TWSI_INT register
194 * @i2c: The struct octeon_i2c
196 * Returns the value of the register.
198 static inline u64 octeon_i2c_read_int(struct octeon_i2c *i2c)
200 return __raw_readq(i2c->twsi_base + TWSI_INT(i2c));
204 * octeon_i2c_write_int - write the TWSI_INT register
205 * @i2c: The struct octeon_i2c
206 * @data: Value to be written
208 static inline void octeon_i2c_write_int(struct octeon_i2c *i2c, u64 data)
210 octeon_i2c_writeq_flush(data, i2c->twsi_base + TWSI_INT(i2c));
214 irqreturn_t octeon_i2c_isr(int irq, void *dev_id);
215 int octeon_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num);
216 int octeon_i2c_init_lowlevel(struct octeon_i2c *i2c);
217 void octeon_i2c_set_clock(struct octeon_i2c *i2c);
218 extern struct i2c_bus_recovery_info octeon_i2c_recovery_info;