diff options
Diffstat (limited to 'src/soc/qualcomm/ipq806x/i2c.c')
| -rw-r--r-- | src/soc/qualcomm/ipq806x/i2c.c | 143 |
1 files changed, 143 insertions, 0 deletions
diff --git a/src/soc/qualcomm/ipq806x/i2c.c b/src/soc/qualcomm/ipq806x/i2c.c new file mode 100644 index 0000000000..9bae822a8e --- /dev/null +++ b/src/soc/qualcomm/ipq806x/i2c.c @@ -0,0 +1,143 @@ +/* + * This file is part of the depthcharge project. + * + * Copyright (C) 2014 The Linux Foundation. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. The name of the author may not be used to endorse or promote products + * derived from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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. + */ + +#include <assert.h> +#include <libpayload.h> + +#include "base/container_of.h" +#include "drivers/bus/i2c/i2c.h" +#include "drivers/bus/i2c/ipq806x_qup.h" +#include "drivers/bus/i2c/ipq806x_gsbi.h" +#include "drivers/bus/i2c/ipq806x.h" + +static int i2c_init(unsigned gsbi_id) +{ + gsbi_return_t gsbi_ret = 0; + qup_return_t qup_ret = 0; + qup_config_t gsbi4_qup_config = { + QUP_MINICORE_I2C_MASTER, + 100000, + 24000000, + QUP_MODE_FIFO + }; + + gsbi_ret = gsbi_init(gsbi_id, GSBI_PROTO_I2C_ONLY); + if (GSBI_SUCCESS != gsbi_ret) + return 1; + + qup_ret = qup_init(gsbi_id, &gsbi4_qup_config); + if (QUP_SUCCESS != qup_ret) + return 1; + + qup_ret = qup_reset_i2c_master_status(gsbi_id); + if (QUP_SUCCESS != qup_ret) + return 1; + + return 0; +} + +static int i2c_read(uint32_t gsbi_id, uint8_t slave, + uint8_t *data, int data_len) +{ + qup_data_t obj; + qup_return_t qup_ret = 0; + + memset(&obj, 0, sizeof(obj)); + obj.protocol = QUP_MINICORE_I2C_MASTER; + obj.p.iic.addr = slave; + obj.p.iic.data_len = data_len; + obj.p.iic.data = data; + qup_ret = qup_recv_data(gsbi_id, &obj); + + if (QUP_SUCCESS != qup_ret) + return 1; + else + return 0; +} + +static int i2c_write(uint32_t gsbi_id, uint8_t slave, + uint8_t *data, int data_len, uint8_t stop_seq) +{ + qup_data_t obj; + qup_return_t qup_ret = 0; + + memset(&obj, 0, sizeof(obj)); + obj.protocol = QUP_MINICORE_I2C_MASTER; + obj.p.iic.addr = slave; + obj.p.iic.data_len = data_len; + obj.p.iic.data = data; + qup_ret = qup_send_data(gsbi_id, &obj, stop_seq); + + if (QUP_SUCCESS != qup_ret) + return 1; + else + return 0; +} + +static int i2c_transfer(struct I2cOps *me, I2cSeg *segments, int seg_count) +{ + Ipq806xI2c *bus = container_of(me, Ipq806xI2c, ops); + I2cSeg *seg = segments; + int ret = 0; + + if (!bus->initialized) + if (0 != i2c_init(bus->gsbi_id)) + return 1; + + while (seg_count--) { + if (seg->read) + ret = i2c_read(bus->gsbi_id, seg->chip, + seg->buf, seg->len); + else + ret = i2c_write(bus->gsbi_id, seg->chip, + seg->buf, seg->len, + (seg_count ? 0 : 1)); + seg++; + } + + if (QUP_SUCCESS != ret) { + qup_set_state(bus->gsbi_id, QUP_STATE_RESET); + return 1; + } + + return 0; +} + +Ipq806xI2c *new_ipq806x_i2c(unsigned gsbi_id) +{ + Ipq806xI2c *bus = 0; + + if (!i2c_init(gsbi_id)) { + bus = xzalloc(sizeof(*bus)); + bus->gsbi_id = gsbi_id; + bus->initialized = 1; + bus->ops.transfer = &i2c_transfer; + } + return bus; +} |