diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/drivers/i2c/designware/dw_i2c.c | 104 |
1 files changed, 58 insertions, 46 deletions
diff --git a/src/drivers/i2c/designware/dw_i2c.c b/src/drivers/i2c/designware/dw_i2c.c index 21a68af24f..00865e3f6e 100644 --- a/src/drivers/i2c/designware/dw_i2c.c +++ b/src/drivers/i2c/designware/dw_i2c.c @@ -91,54 +91,58 @@ enum { /* I2C Controller MMIO register space */ struct dw_i2c_regs { - uint32_t control; - uint32_t target_addr; - uint32_t slave_addr; - uint32_t master_addr; - uint32_t cmd_data; - uint32_t ss_scl_hcnt; - uint32_t ss_scl_lcnt; - uint32_t fs_scl_hcnt; - uint32_t fs_scl_lcnt; - uint32_t hs_scl_hcnt; - uint32_t hs_scl_lcnt; - uint32_t intr_stat; - uint32_t intr_mask; - uint32_t raw_intr_stat; - uint32_t rx_thresh; - uint32_t tx_thresh; - uint32_t clear_intr; - uint32_t clear_rx_under_intr; - uint32_t clear_rx_over_intr; - uint32_t clear_tx_over_intr; - uint32_t clear_rd_req_intr; - uint32_t clear_tx_abrt_intr; - uint32_t clear_rx_done_intr; - uint32_t clear_activity_intr; - uint32_t clear_stop_det_intr; - uint32_t clear_start_det_intr; - uint32_t clear_gen_call_intr; - uint32_t enable; - uint32_t status; - uint32_t tx_level; - uint32_t rx_level; - uint32_t sda_hold; - uint32_t tx_abort_source; - uint32_t slv_data_nak_only; - uint32_t dma_cr; - uint32_t dma_tdlr; - uint32_t dma_rdlr; - uint32_t sda_setup; - uint32_t ack_general_call; - uint32_t enable_status; - uint32_t fs_spklen; - uint32_t hs_spklen; - uint32_t clr_restart_det; - uint32_t comp_param1; - uint32_t comp_version; - uint32_t comp_type; + uint32_t control; /* 0x0 */ + uint32_t target_addr; /* 0x4 */ + uint32_t slave_addr; /* 0x8 */ + uint32_t master_addr; /* 0xc */ + uint32_t cmd_data; /* 0x10 */ + uint32_t ss_scl_hcnt; /* 0x14 */ + uint32_t ss_scl_lcnt; /* 0x18 */ + uint32_t fs_scl_hcnt; /* 0x1c */ + uint32_t fs_scl_lcnt; /* 0x20 */ + uint32_t hs_scl_hcnt; /* 0x24 */ + uint32_t hs_scl_lcnt; /* 0x28 */ + uint32_t intr_stat; /* 0x2c */ + uint32_t intr_mask; /* 0x30 */ + uint32_t raw_intr_stat; /* 0x34 */ + uint32_t rx_thresh; /* 0x38 */ + uint32_t tx_thresh; /* 0x3c */ + uint32_t clear_intr; /* 0x40 */ + uint32_t clear_rx_under_intr; /* 0x44 */ + uint32_t clear_rx_over_intr; /* 0x48 */ + uint32_t clear_tx_over_intr; /* 0x4c */ + uint32_t clear_rd_req_intr; /* 0x50 */ + uint32_t clear_tx_abrt_intr; /* 0x54 */ + uint32_t clear_rx_done_intr; /* 0x58 */ + uint32_t clear_activity_intr; /* 0x5c */ + uint32_t clear_stop_det_intr; /* 0x60 */ + uint32_t clear_start_det_intr; /* 0x64 */ + uint32_t clear_gen_call_intr; /* 0x68 */ + uint32_t enable; /* 0x6c */ + uint32_t status; /* 0x70 */ + uint32_t tx_level; /* 0x74 */ + uint32_t rx_level; /* 0x78 */ + uint32_t sda_hold; /* 0x7c */ + uint32_t tx_abort_source; /* 0x80 */ + uint32_t slv_data_nak_only; /* 0x84 */ + uint32_t dma_cr; /* 0x88 */ + uint32_t dma_tdlr; /* 0x8c */ + uint32_t dma_rdlr; /* 0x90 */ + uint32_t sda_setup; /* 0x94 */ + uint32_t ack_general_call; /* 0x98 */ + uint32_t enable_status; /* 0x9c */ + uint32_t fs_spklen; /* 0xa0 */ + uint32_t hs_spklen; /* 0xa4 */ + uint32_t clr_restart_det; /* 0xa8 */ + uint32_t reserved[18]; /* 0xac - 0xf0 */ + uint32_t comp_param1; /* 0xf4 */ + uint32_t comp_version; /* 0xf8 */ + uint32_t comp_type; /* 0xfc */ } __packed; +/* Constant value defined in the DesignWare DW_apb_i2c Databook. */ +#define DW_I2C_COMP_TYPE 0x44570140 + static const struct i2c_descriptor { enum i2c_speed speed; struct freq freq; @@ -717,6 +721,14 @@ int dw_i2c_init(unsigned int bus, const struct dw_i2c_bus_config *bcfg) return -1; } + if (read32(®s->comp_type) != DW_I2C_COMP_TYPE) { + printk(BIOS_ERR, "I2C bus %u has unknown type 0x%x.\n", bus, + read32(®s->comp_type)); + return -1; + } + + printk(BIOS_DEBUG, "I2C bus %u version 0x%x\n", bus, read32(®s->comp_version)); + if (dw_i2c_disable(regs) < 0) { printk(BIOS_ERR, "I2C timeout disabling bus %u\n", bus); return -1; |