| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Jan Glauber | 823 | 99.88% | 8 | 88.89% |
| Greg Kroah-Hartman | 1 | 0.12% | 1 | 11.11% |
| Total | 824 | 9 |
/* SPDX-License-Identifier: GPL-2.0 */ #include <linux/atomic.h> #include <linux/clk.h> #include <linux/delay.h> #include <linux/device.h> #include <linux/i2c.h> #include <linux/i2c-smbus.h> #include <linux/io.h> #include <linux/kernel.h> /* Controller command patterns */ #define SW_TWSI_V BIT_ULL(63) /* Valid bit */ #define SW_TWSI_EIA BIT_ULL(61) /* Extended internal address */ #define SW_TWSI_R BIT_ULL(56) /* Result or read bit */ #define SW_TWSI_SOVR BIT_ULL(55) /* Size override */ #define SW_TWSI_SIZE_SHIFT 52 #define SW_TWSI_ADDR_SHIFT 40 #define SW_TWSI_IA_SHIFT 32 /* Internal address */ /* Controller opcode word (bits 60:57) */ #define SW_TWSI_OP_SHIFT 57 #define SW_TWSI_OP_7 (0ULL << SW_TWSI_OP_SHIFT) #define SW_TWSI_OP_7_IA (1ULL << SW_TWSI_OP_SHIFT) #define SW_TWSI_OP_10 (2ULL << SW_TWSI_OP_SHIFT) #define SW_TWSI_OP_10_IA (3ULL << SW_TWSI_OP_SHIFT) #define SW_TWSI_OP_TWSI_CLK (4ULL << SW_TWSI_OP_SHIFT) #define SW_TWSI_OP_EOP (6ULL << SW_TWSI_OP_SHIFT) /* Extended opcode */ /* Controller extended opcode word (bits 34:32) */ #define SW_TWSI_EOP_SHIFT 32 #define SW_TWSI_EOP_TWSI_DATA (SW_TWSI_OP_EOP | 1ULL << SW_TWSI_EOP_SHIFT) #define SW_TWSI_EOP_TWSI_CTL (SW_TWSI_OP_EOP | 2ULL << SW_TWSI_EOP_SHIFT) #define SW_TWSI_EOP_TWSI_CLKCTL (SW_TWSI_OP_EOP | 3ULL << SW_TWSI_EOP_SHIFT) #define SW_TWSI_EOP_TWSI_STAT (SW_TWSI_OP_EOP | 3ULL << SW_TWSI_EOP_SHIFT) #define SW_TWSI_EOP_TWSI_RST (SW_TWSI_OP_EOP | 7ULL << SW_TWSI_EOP_SHIFT) /* Controller command and status bits */ #define TWSI_CTL_CE 0x80 /* High level controller enable */ #define TWSI_CTL_ENAB 0x40 /* Bus enable */ #define TWSI_CTL_STA 0x20 /* Master-mode start, HW clears when done */ #define TWSI_CTL_STP 0x10 /* Master-mode stop, HW clears when done */ #define TWSI_CTL_IFLG 0x08 /* HW event, SW writes 0 to ACK */ #define TWSI_CTL_AAK 0x04 /* Assert ACK */ /* Status values */ #define STAT_BUS_ERROR 0x00 #define STAT_START 0x08 #define STAT_REP_START 0x10 #define STAT_TXADDR_ACK 0x18 #define STAT_TXADDR_NAK 0x20 #define STAT_TXDATA_ACK 0x28 #define STAT_TXDATA_NAK 0x30 #define STAT_LOST_ARB_38 0x38 #define STAT_RXADDR_ACK 0x40 #define STAT_RXADDR_NAK 0x48 #define STAT_RXDATA_ACK 0x50 #define STAT_RXDATA_NAK 0x58 #define STAT_SLAVE_60 0x60 #define STAT_LOST_ARB_68 0x68 #define STAT_SLAVE_70 0x70 #define STAT_LOST_ARB_78 0x78 #define STAT_SLAVE_80 0x80 #define STAT_SLAVE_88 0x88 #define STAT_GENDATA_ACK 0x90 #define STAT_GENDATA_NAK 0x98 #define STAT_SLAVE_A0 0xA0 #define STAT_SLAVE_A8 0xA8 #define STAT_LOST_ARB_B0 0xB0 #define STAT_SLAVE_LOST 0xB8 #define STAT_SLAVE_NAK 0xC0 #define STAT_SLAVE_ACK 0xC8 #define STAT_AD2W_ACK 0xD0 #define STAT_AD2W_NAK 0xD8 #define STAT_IDLE 0xF8 /* TWSI_INT values */ #define TWSI_INT_ST_INT BIT_ULL(0) #define TWSI_INT_TS_INT BIT_ULL(1) #define TWSI_INT_CORE_INT BIT_ULL(2) #define TWSI_INT_ST_EN BIT_ULL(4) #define TWSI_INT_TS_EN BIT_ULL(5) #define TWSI_INT_CORE_EN BIT_ULL(6) #define TWSI_INT_SDA_OVR BIT_ULL(8) #define TWSI_INT_SCL_OVR BIT_ULL(9) #define TWSI_INT_SDA BIT_ULL(10) #define TWSI_INT_SCL BIT_ULL(11) #define I2C_OCTEON_EVENT_WAIT 80 /* microseconds */ /* Register offsets */ struct octeon_i2c_reg_offset { unsigned int sw_twsi; unsigned int twsi_int; unsigned int sw_twsi_ext; }; #define SW_TWSI(x) (x->roff.sw_twsi) #define TWSI_INT(x) (x->roff.twsi_int) #define SW_TWSI_EXT(x) (x->roff.sw_twsi_ext) struct octeon_i2c { wait_queue_head_t queue; struct i2c_adapter adap; struct octeon_i2c_reg_offset roff; struct clk *clk; int irq; int hlc_irq; /* For cn7890 only */ u32 twsi_freq; int sys_freq; void __iomem *twsi_base; struct device *dev; bool hlc_enabled; bool broken_irq_mode; bool broken_irq_check; void (*int_enable)(struct octeon_i2c *); void (*int_disable)(struct octeon_i2c *); void (*hlc_int_enable)(struct octeon_i2c *); void (*hlc_int_disable)(struct octeon_i2c *); atomic_t int_enable_cnt; atomic_t hlc_int_enable_cnt; struct i2c_smbus_alert_setup alert_data; struct i2c_client *ara; }; static inline void octeon_i2c_writeq_flush(u64 val, void __iomem *addr) { __raw_writeq(val, addr); __raw_readq(addr); /* wait for write to land */ } /** * octeon_i2c_reg_write - write an I2C core register * @i2c: The struct octeon_i2c * @eop_reg: Register selector * @data: Value to be written * * The I2C core registers are accessed indirectly via the SW_TWSI CSR. */ static inline void octeon_i2c_reg_write(struct octeon_i2c *i2c, u64 eop_reg, u8 data) { int tries = 1000; u64 tmp; __raw_writeq(SW_TWSI_V | eop_reg | data, i2c->twsi_base + SW_TWSI(i2c)); do { tmp = __raw_readq(i2c->twsi_base + SW_TWSI(i2c)); if (--tries < 0) return; } while ((tmp & SW_TWSI_V) != 0); } #define octeon_i2c_ctl_write(i2c, val) \ octeon_i2c_reg_write(i2c, SW_TWSI_EOP_TWSI_CTL, val) #define octeon_i2c_data_write(i2c, val) \ octeon_i2c_reg_write(i2c, SW_TWSI_EOP_TWSI_DATA, val) /** * octeon_i2c_reg_read - read lower bits of an I2C core register * @i2c: The struct octeon_i2c * @eop_reg: Register selector * * Returns the data. * * The I2C core registers are accessed indirectly via the SW_TWSI CSR. */ static inline int octeon_i2c_reg_read(struct octeon_i2c *i2c, u64 eop_reg, int *error) { int tries = 1000; u64 tmp; __raw_writeq(SW_TWSI_V | eop_reg | SW_TWSI_R, i2c->twsi_base + SW_TWSI(i2c)); do { tmp = __raw_readq(i2c->twsi_base + SW_TWSI(i2c)); if (--tries < 0) { /* signal that the returned data is invalid */ if (error) *error = -EIO; return 0; } } while ((tmp & SW_TWSI_V) != 0); return tmp & 0xFF; } #define octeon_i2c_ctl_read(i2c) \ octeon_i2c_reg_read(i2c, SW_TWSI_EOP_TWSI_CTL, NULL) #define octeon_i2c_data_read(i2c, error) \ octeon_i2c_reg_read(i2c, SW_TWSI_EOP_TWSI_DATA, error) #define octeon_i2c_stat_read(i2c) \ octeon_i2c_reg_read(i2c, SW_TWSI_EOP_TWSI_STAT, NULL) /** * octeon_i2c_read_int - read the TWSI_INT register * @i2c: The struct octeon_i2c * * Returns the value of the register. */ static inline u64 octeon_i2c_read_int(struct octeon_i2c *i2c) { return __raw_readq(i2c->twsi_base + TWSI_INT(i2c)); } /** * octeon_i2c_write_int - write the TWSI_INT register * @i2c: The struct octeon_i2c * @data: Value to be written */ static inline void octeon_i2c_write_int(struct octeon_i2c *i2c, u64 data) { octeon_i2c_writeq_flush(data, i2c->twsi_base + TWSI_INT(i2c)); } /* Prototypes */ irqreturn_t octeon_i2c_isr(int irq, void *dev_id); int octeon_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num); int octeon_i2c_init_lowlevel(struct octeon_i2c *i2c); void octeon_i2c_set_clock(struct octeon_i2c *i2c); extern struct i2c_bus_recovery_info octeon_i2c_recovery_info;
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