diff options
Diffstat (limited to 'drivers/i2c/busses/i2c-octeon-core.c')
| -rw-r--r-- | drivers/i2c/busses/i2c-octeon-core.c | 166 |
1 files changed, 160 insertions, 6 deletions
diff --git a/drivers/i2c/busses/i2c-octeon-core.c b/drivers/i2c/busses/i2c-octeon-core.c index baf6b27f3752..93a49e4637ec 100644 --- a/drivers/i2c/busses/i2c-octeon-core.c +++ b/drivers/i2c/busses/i2c-octeon-core.c @@ -135,6 +135,32 @@ static void octeon_i2c_hlc_disable(struct octeon_i2c *i2c) octeon_i2c_ctl_write(i2c, TWSI_CTL_ENAB); } +static void octeon_i2c_block_enable(struct octeon_i2c *i2c) +{ + u64 mode; + + if (i2c->block_enabled || !OCTEON_REG_BLOCK_CTL(i2c)) + return; + + i2c->block_enabled = true; + mode = __raw_readq(i2c->twsi_base + OCTEON_REG_MODE(i2c)); + mode |= TWSX_MODE_BLOCK_MODE; + octeon_i2c_writeq_flush(mode, i2c->twsi_base + OCTEON_REG_MODE(i2c)); +} + +static void octeon_i2c_block_disable(struct octeon_i2c *i2c) +{ + u64 mode; + + if (!i2c->block_enabled || !OCTEON_REG_BLOCK_CTL(i2c)) + return; + + i2c->block_enabled = false; + mode = __raw_readq(i2c->twsi_base + OCTEON_REG_MODE(i2c)); + mode &= ~TWSX_MODE_BLOCK_MODE; + octeon_i2c_writeq_flush(mode, i2c->twsi_base + OCTEON_REG_MODE(i2c)); +} + /** * octeon_i2c_hlc_wait - wait for an HLC operation to complete * @i2c: The struct octeon_i2c @@ -281,6 +307,7 @@ static int octeon_i2c_start(struct octeon_i2c *i2c) u8 stat; octeon_i2c_hlc_disable(i2c); + octeon_i2c_block_disable(i2c); octeon_i2c_ctl_write(i2c, TWSI_CTL_ENAB | TWSI_CTL_STA); ret = octeon_i2c_wait(i2c); @@ -605,6 +632,125 @@ err: } /** + * octeon_i2c_hlc_block_comp_read - high-level-controller composite block read + * @i2c: The struct octeon_i2c + * @msgs: msg[0] contains address, place read data into msg[1] + * + * i2c core command is constructed and written into the SW_TWSI register. + * The execution of the command will result in requested data being + * placed into a FIFO buffer, ready to be read. + * Used in the case where the i2c xfer is for greater than 8 bytes of read data. + * + * Returns: 0 on success, otherwise a negative errno. + */ +static int octeon_i2c_hlc_block_comp_read(struct octeon_i2c *i2c, struct i2c_msg *msgs) +{ + int ret; + u16 len, i; + u64 cmd; + + octeon_i2c_hlc_enable(i2c); + octeon_i2c_block_enable(i2c); + + /* Write (size - 1) into block control register */ + len = msgs[1].len - 1; + octeon_i2c_writeq_flush((u64)len, i2c->twsi_base + OCTEON_REG_BLOCK_CTL(i2c)); + + /* Prepare core command */ + cmd = SW_TWSI_V | SW_TWSI_R | SW_TWSI_SOVR | SW_TWSI_OP_7_IA; + cmd |= (u64)(msgs[0].addr & 0x7full) << SW_TWSI_ADDR_SHIFT; + + /* Send core command */ + ret = octeon_i2c_hlc_read_cmd(i2c, msgs[0], cmd); + if (ret) + goto err; + + cmd = __raw_readq(i2c->twsi_base + OCTEON_REG_SW_TWSI(i2c)); + if ((cmd & SW_TWSI_R) == 0) { + octeon_i2c_block_disable(i2c); + return octeon_i2c_check_status(i2c, false); + } + + /* read data in FIFO */ + octeon_i2c_writeq_flush(TWSX_BLOCK_STS_RESET_PTR, + i2c->twsi_base + OCTEON_REG_BLOCK_STS(i2c)); + for (i = 0; i <= len; i += 8) { + /* Byte-swap FIFO data and copy into msg buffer */ + __be64 rd = cpu_to_be64(__raw_readq(i2c->twsi_base + OCTEON_REG_BLOCK_FIFO(i2c))); + + memcpy(&msgs[1].buf[i], &rd, min(8, msgs[1].len - i)); + } + +err: + octeon_i2c_block_disable(i2c); + return ret; +} + +/** + * octeon_i2c_hlc_block_comp_write - high-level-controller composite block write + * @i2c: The struct octeon_i2c + * @msgs: msg[0] contains address, msg[1] contains data to be written + * + * i2c core command is constructed and write data is written into the FIFO buffer. + * The execution of the command will result in HW write, using the data in FIFO. + * Used in the case where the i2c xfer is for greater than 8 bytes of write data. + * + * Returns: 0 on success, otherwise a negative errno. + */ +static int octeon_i2c_hlc_block_comp_write(struct octeon_i2c *i2c, struct i2c_msg *msgs) +{ + bool set_ext; + int ret; + u16 len, i; + u64 cmd, ext = 0; + + octeon_i2c_hlc_enable(i2c); + octeon_i2c_block_enable(i2c); + + /* Write (size - 1) into block control register */ + len = msgs[1].len - 1; + octeon_i2c_writeq_flush((u64)len, i2c->twsi_base + OCTEON_REG_BLOCK_CTL(i2c)); + + /* Prepare core command */ + cmd = SW_TWSI_V | SW_TWSI_SOVR | SW_TWSI_OP_7_IA; + cmd |= (u64)(msgs[0].addr & 0x7full) << SW_TWSI_ADDR_SHIFT; + + /* Set parameters for extended message (if required) */ + set_ext = octeon_i2c_hlc_ext(i2c, msgs[0], &cmd, &ext); + + /* Write msg into FIFO buffer */ + octeon_i2c_writeq_flush(TWSX_BLOCK_STS_RESET_PTR, + i2c->twsi_base + OCTEON_REG_BLOCK_STS(i2c)); + for (i = 0; i <= len; i += 8) { + __be64 buf = 0; + + /* Copy 8 bytes or remaining bytes from message buffer */ + memcpy(&buf, &msgs[1].buf[i], min(8, msgs[1].len - i)); + + /* Byte-swap message data and write into FIFO */ + buf = cpu_to_be64(buf); + octeon_i2c_writeq_flush((u64)buf, i2c->twsi_base + OCTEON_REG_BLOCK_FIFO(i2c)); + } + if (set_ext) + octeon_i2c_writeq_flush(ext, i2c->twsi_base + OCTEON_REG_SW_TWSI_EXT(i2c)); + + /* Send command to core (send data in FIFO) */ + ret = octeon_i2c_hlc_cmd_send(i2c, cmd); + if (ret) + goto err; + + cmd = __raw_readq(i2c->twsi_base + OCTEON_REG_SW_TWSI(i2c)); + if ((cmd & SW_TWSI_R) == 0) { + octeon_i2c_block_disable(i2c); + return octeon_i2c_check_status(i2c, false); + } + +err: + octeon_i2c_block_disable(i2c); + return ret; +} + +/** * octeon_i2c_xfer - The driver's xfer function * @adap: Pointer to the i2c_adapter structure * @msgs: Pointer to the messages to be processed @@ -630,13 +776,21 @@ int octeon_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num) if ((msgs[0].flags & I2C_M_RD) == 0 && (msgs[1].flags & I2C_M_RECV_LEN) == 0 && msgs[0].len > 0 && msgs[0].len <= 2 && - msgs[1].len > 0 && msgs[1].len <= 8 && + msgs[1].len > 0 && msgs[0].addr == msgs[1].addr) { - if (msgs[1].flags & I2C_M_RD) - ret = octeon_i2c_hlc_comp_read(i2c, msgs); - else - ret = octeon_i2c_hlc_comp_write(i2c, msgs); - goto out; + if (msgs[1].len <= 8) { + if (msgs[1].flags & I2C_M_RD) + ret = octeon_i2c_hlc_comp_read(i2c, msgs); + else + ret = octeon_i2c_hlc_comp_write(i2c, msgs); + goto out; + } else if (msgs[1].len <= 1024 && OCTEON_REG_BLOCK_CTL(i2c)) { + if (msgs[1].flags & I2C_M_RD) + ret = octeon_i2c_hlc_block_comp_read(i2c, msgs); + else + ret = octeon_i2c_hlc_block_comp_write(i2c, msgs); + goto out; + } } } } |