diff options
Diffstat (limited to 'drivers/media/isdbt/fc8150/fci_i2c.c')
| -rw-r--r-- | drivers/media/isdbt/fc8150/fci_i2c.c | 226 |
1 files changed, 226 insertions, 0 deletions
diff --git a/drivers/media/isdbt/fc8150/fci_i2c.c b/drivers/media/isdbt/fc8150/fci_i2c.c new file mode 100644 index 0000000..1f011ca --- /dev/null +++ b/drivers/media/isdbt/fc8150/fci_i2c.c @@ -0,0 +1,226 @@ +/***************************************************************************** + Copyright(c) 2012 FCI Inc. All Rights Reserved + + File name : fci_i2c.c + + Description : fci i2c driver +*******************************************************************************/ + +#include "fci_types.h" +#include "fci_oal.h" +#include "fc8150_regs.h" +#include "fci_hal.h" + +#define I2CSTAT_TIP 0x02 /* Tip bit */ +#define I2CSTAT_NACK 0x80 /* Nack bit */ + +#define I2C_TIMEOUT 100 + +#define I2C_CR_STA 0x80 +#define I2C_CR_STO 0x40 +#define I2C_CR_RD 0x20 +#define I2C_CR_WR 0x10 +#define I2C_CR_NACK 0x08 +#define I2C_CR_IACK 0x01 + +#define I2C_WRITE 0 +#define I2C_READ 1 + +#define I2C_OK 0 +#define I2C_NOK 1 +#define I2C_NACK 2 +#define I2C_NOK_LA 3 /* Lost arbitration */ +#define I2C_NOK_TOUT 4 /* time out */ + +#define FC8150_FREQ_XTAL BBM_XTAL_FREQ + +/* static OAL_SEMAPHORE hBbmMutex; */ + +static int WaitForXfer(HANDLE hDevice) +{ + int i; + int res = I2C_OK; + u8 status; + + i = I2C_TIMEOUT * 20000; + /* wait for transfer complete */ + do { + bbm_read(hDevice, BBM_I2C_SR, &status); + i--; + } while ((i > 0) && (status & I2CSTAT_TIP)); + + /* check time out or nack */ + if (status & I2CSTAT_TIP) { + res = I2C_NOK_TOUT; + } else { + bbm_read(hDevice, BBM_I2C_SR, &status); + if (status & I2CSTAT_NACK) + res = I2C_NACK; + else + res = I2C_OK; + } + + return res; +} + +static int fci_i2c_transfer(HANDLE hDevice, u8 cmd_type, u8 chip + , u8 addr[], u8 addr_len, u8 data[], u8 data_len) +{ + int i; + int result = I2C_OK; + + switch (cmd_type) { + case I2C_WRITE: + bbm_write(hDevice, BBM_I2C_TXR, chip | cmd_type); + bbm_write(hDevice, BBM_I2C_CR, I2C_CR_STA | I2C_CR_WR /*0x90*/); + result = WaitForXfer(hDevice); + if (result != I2C_OK) + return result; + + if (addr && addr_len) { + i = 0; + while ((i < addr_len) && (result == I2C_OK)) { + bbm_write(hDevice, BBM_I2C_TXR, addr[i]); + bbm_write(hDevice, BBM_I2C_CR + , I2C_CR_WR /*0x10*/); + result = WaitForXfer(hDevice); + if (result != I2C_OK) + return result; + i++; + } + } + + i = 0; + while ((i < data_len) && (result == I2C_OK)) { + bbm_write(hDevice, BBM_I2C_TXR, data[i]); + bbm_write(hDevice, BBM_I2C_CR, I2C_CR_WR /*0x10*/); + result = WaitForXfer(hDevice); + if (result != I2C_OK) + return result; + i++; + } + + bbm_write(hDevice, BBM_I2C_CR, I2C_CR_STO /*0x40*/); + result = WaitForXfer(hDevice); + if (result != I2C_OK) + return result; + break; + case I2C_READ: + if (addr && addr_len) { + bbm_write(hDevice, BBM_I2C_TXR, chip | I2C_WRITE); + bbm_write(hDevice, BBM_I2C_CR + , I2C_CR_STA | I2C_CR_WR /*0x90*/); + result = WaitForXfer(hDevice); + if (result != I2C_OK) + return result; + + i = 0; + while ((i < addr_len) && (result == I2C_OK)) { + bbm_write(hDevice, BBM_I2C_TXR, addr[i]); + bbm_write(hDevice, BBM_I2C_CR + , I2C_CR_WR /*0x10*/); + result = WaitForXfer(hDevice); + if (result != I2C_OK) + return result; + i++; + } + } + + bbm_write(hDevice, BBM_I2C_TXR, chip | I2C_READ); + bbm_write(hDevice, BBM_I2C_CR, I2C_CR_STA | I2C_CR_WR /*0x90*/); + result = WaitForXfer(hDevice); + if (result != I2C_OK) + return result; + + i = 0; + while ((i < data_len) && (result == I2C_OK)) { + if (i == data_len - 1) { + bbm_write(hDevice, BBM_I2C_CR + , I2C_CR_RD|I2C_CR_NACK/*0x28*/); + result = WaitForXfer(hDevice); + if ((result != I2C_NACK) + && (result != I2C_OK)) { + PRINTF(hDevice, "NACK4-0[%02x]\n" + , result); + return result; + } + } else { + bbm_write(hDevice, BBM_I2C_CR + , I2C_CR_RD /*0x20*/); + result = WaitForXfer(hDevice); + if (result != I2C_OK) { + PRINTF(hDevice, "NACK4-1[%02x]\n" + , result); + return result; + } + } + bbm_read(hDevice, BBM_I2C_RXR, &data[i]); + i++; + } + + bbm_write(hDevice, BBM_I2C_CR, I2C_CR_STO /*0x40*/); + result = WaitForXfer(hDevice); + if ((result != I2C_NACK) && (result != I2C_OK)) { + PRINTF(hDevice, "NACK5[%02X]\n", result); + return result; + } + break; + default: + return I2C_NOK; + } + + return I2C_OK; +} + +int fci_i2c_init(HANDLE hDevice, int speed, int slaveaddr) +{ + u16 r = FC8150_FREQ_XTAL % (5 * speed); + u16 pr = (FC8150_FREQ_XTAL - r) / (5 * speed) - 1; + + if (((5 * speed) >> 1) <= r) + pr++; + + bbm_word_write(hDevice, BBM_I2C_PR_L, pr); + bbm_write(hDevice, BBM_I2C_CTR, 0xc0); + + PRINTF(hDevice, "Internal I2C Pre-scale: 0x%02x\n", pr); + + return BBM_OK; +} + +int fci_i2c_read(HANDLE hDevice, u8 chip, u8 addr, u8 alen, u8 *data, u8 len) +{ + int ret; + + ret = fci_i2c_transfer(hDevice, I2C_READ, chip << 1, &addr + , alen, data, len); + + if (ret != I2C_OK) { + PRINTF(hDevice, "fci_i2c_read() result=%d, addr = %x, data=%x\n" + , ret, addr, *data); + return ret; + } + + return ret; +} + +int fci_i2c_write(HANDLE hDevice, u8 chip, u8 addr, u8 alen, u8 *data, u8 len) +{ + int ret; + u8 *paddr = &addr; + + ret = fci_i2c_transfer(hDevice, I2C_WRITE, chip << 1 + , paddr, alen, data, len); + + if (ret != I2C_OK) + PRINTF(hDevice, "fci_i2c_write() result=%d, addr= %x, data=%x\n" + , ret, addr, *data); + + return ret; +} + +int fci_i2c_deinit(HANDLE hDevice) +{ + bbm_write(hDevice, BBM_I2C_CTR, 0x00); + return BBM_OK; +} |