diff options
Diffstat (limited to 'arch/mips/pmc-sierra/yosemite/i2c-yosemite.c')
| -rw-r--r-- | arch/mips/pmc-sierra/yosemite/i2c-yosemite.c | 188 |
1 files changed, 0 insertions, 188 deletions
diff --git a/arch/mips/pmc-sierra/yosemite/i2c-yosemite.c b/arch/mips/pmc-sierra/yosemite/i2c-yosemite.c deleted file mode 100644 index 85b14c73c226..000000000000 --- a/arch/mips/pmc-sierra/yosemite/i2c-yosemite.c +++ /dev/null @@ -1,188 +0,0 @@ -/* - * Copyright (C) 2003 PMC-Sierra Inc. - * Author: Manish Lachwani (lachwani@pmc-sierra.com) - * - * This program is free software; you can redistribute it and/or modify it - * under the terms of the GNU General Public License as published by the - * Free Software Foundation; either version 2 of the License, or (at your - * option) any later version. - * - * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED - * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF - * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN - * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, - * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT - * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF - * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON - * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT - * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF - * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. - * - * You should have received a copy of the GNU General Public License along - * with this program; if not, write to the Free Software Foundation, Inc., - * 675 Mass Ave, Cambridge, MA 02139, USA. - */ - -/* - * Detailed Description: - * - * This block implements the I2C interface to the slave devices like the - * Atmel 24C32 EEPROM and the MAX 1619 Sensors device. The I2C Master interface - * can be controlled by the SCMB block. And the SCMB block kicks in only when - * using the Ethernet Mode of operation and __not__ the SysAD mode - * - * The SCMB controls the two modes: MDIO and the I2C. The MDIO mode is used to - * communicate with the Quad-PHY from Marvel. The I2C is used to communicate - * with the I2C slave devices. It seems that the driver does not explicitly - * deal with the control of SDA and SCL serial lines. So, the driver will set - * the slave address, drive the command and then the data. The SCMB will then - * control the two serial lines as required. - * - * It seems the documents are very unclear abt this. Hence, I took some time - * out to write the desciption to have an idea of how the I2C can actually - * work. Currently, this Linux driver wont be integrated into the generic Linux - * I2C framework. And finally, the I2C interface is also known as the 2BI - * interface. 2BI means 2-bit interface referring to SDA and SCL serial lines - * respectively. - * - * - Manish Lachwani (12/09/2003) - */ - -#include "i2c-yosemite.h" - -/* - * Poll the I2C interface for the BUSY bit. - */ -static int titan_i2c_poll(void) -{ - int i = 0; - unsigned long val = 0; - - for (i = 0; i < TITAN_I2C_MAX_POLL; i++) { - val = TITAN_I2C_READ(TITAN_I2C_COMMAND); - - if (!(val & 0x8000)) - return 0; - } - - return TITAN_I2C_ERR_TIMEOUT; -} - -/* - * Execute the I2C command - */ -int titan_i2c_xfer(unsigned int slave_addr, titan_i2c_command * cmd, - int size, unsigned int *addr) -{ - int loop, bytes = 0, i; - unsigned int *write_data, data, *read_data; - unsigned long reg_val, val; - - write_data = cmd->data; - read_data = addr; - - TITAN_I2C_WRITE(TITAN_I2C_SLAVE_ADDRESS, slave_addr); - - if (cmd->type == TITAN_I2C_CMD_WRITE) - loop = cmd->write_size; - else - loop = size; - - while (loop > 0) { - if ((cmd->type == TITAN_I2C_CMD_WRITE) || - (cmd->type == TITAN_I2C_CMD_READ_WRITE)) { - - reg_val = TITAN_I2C_DATA; - for (i = 0; i < TITAN_I2C_MAX_WORDS_PER_RW; - ++i, write_data += 2, reg_val += 4) { - if (bytes < cmd->write_size) { - data = write_data[0]; - ++data; - } - - if (bytes < cmd->write_size) { - data = write_data[1]; - ++data; - } - - TITAN_I2C_WRITE(reg_val, data); - } - } - - TITAN_I2C_WRITE(TITAN_I2C_COMMAND, - (unsigned int) (cmd->type << 13)); - if (titan_i2c_poll() != TITAN_I2C_ERR_OK) - return TITAN_I2C_ERR_TIMEOUT; - - if ((cmd->type == TITAN_I2C_CMD_READ) || - (cmd->type == TITAN_I2C_CMD_READ_WRITE)) { - - reg_val = TITAN_I2C_DATA; - for (i = 0; i < TITAN_I2C_MAX_WORDS_PER_RW; - ++i, read_data += 2, reg_val += 4) { - data = TITAN_I2C_READ(reg_val); - - if (bytes < size) { - read_data[0] = data & 0xff; - ++bytes; - } - - if (bytes < size) { - read_data[1] = - ((data >> 8) & 0xff); - ++bytes; - } - } - } - - loop -= (TITAN_I2C_MAX_WORDS_PER_RW * 2); - } - - /* - * Read the Interrupt status and then return the appropriate error code - */ - - val = TITAN_I2C_READ(TITAN_I2C_INTERRUPTS); - if (val & 0x0020) - return TITAN_I2C_ERR_ARB_LOST; - - if (val & 0x0040) - return TITAN_I2C_ERR_NO_RESP; - - if (val & 0x0080) - return TITAN_I2C_ERR_DATA_COLLISION; - - return TITAN_I2C_ERR_OK; -} - -/* - * Init the I2C subsystem of the PMC-Sierra Yosemite board - */ -int titan_i2c_init(titan_i2c_config * config) -{ - unsigned int val; - - /* - * Reset the SCMB and program into the I2C mode - */ - TITAN_I2C_WRITE(TITAN_I2C_SCMB_CONTROL, 0xA000); - TITAN_I2C_WRITE(TITAN_I2C_SCMB_CONTROL, 0x2000); - - /* - * Configure the filtera and clka values - */ - val = TITAN_I2C_READ(TITAN_I2C_SCMB_CLOCK_A); - val |= ((val & ~(0xF000)) | ((config->filtera << 12) & 0xF000)); - val |= ((val & ~(0x03FF)) | (config->clka & 0x03FF)); - TITAN_I2C_WRITE(TITAN_I2C_SCMB_CLOCK_A, val); - - /* - * Configure the filterb and clkb values - */ - val = TITAN_I2C_READ(TITAN_I2C_SCMB_CLOCK_B); - val |= ((val & ~(0xF000)) | ((config->filterb << 12) & 0xF000)); - val |= ((val & ~(0x03FF)) | (config->clkb & 0x03FF)); - TITAN_I2C_WRITE(TITAN_I2C_SCMB_CLOCK_B, val); - - return TITAN_I2C_ERR_OK; -} |