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/***********************license start***************
* Copyright (c) 2003-2010 Cavium Networks (support@cavium.com). All rights
* reserved.
*
*
* Redistribution and use in source and binary forms, with or without
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*
* * Redistributions of source code must retain the above copyright
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*
* * 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.
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* TO THE MAXIMUM EXTENT PERMITTED BY LAW, THE SOFTWARE IS PROVIDED "AS IS"
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***********************license end**************************************/
/**
* @file
*
* Interface to the TWSI / I2C bus
*
* <hr>$Revision: 49448 $<hr>
*
*/
#ifdef CVMX_BUILD_FOR_LINUX_KERNEL
#include <linux/i2c.h>
#include <asm/octeon/cvmx.h>
#include <asm/octeon/cvmx-twsi.h>
#else
#include "cvmx.h"
#include "cvmx-twsi.h"
#include "cvmx-csr-db.h"
#endif
//#define PRINT_TWSI_CONFIG
#ifdef PRINT_TWSI_CONFIG
#define twsi_printf printf
#else
#define twsi_printf(...)
#define cvmx_csr_db_decode(...)
#endif
#ifdef CVMX_BUILD_FOR_LINUX_KERNEL
static struct i2c_adapter *__cvmx_twsix_get_adapter(int twsi_id)
{
# if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
struct octeon_i2c {
wait_queue_head_t queue;
struct i2c_adapter adap;
int irq;
int twsi_freq;
int sys_freq;
resource_size_t twsi_phys;
void __iomem *twsi_base;
resource_size_t regsize;
struct device *dev;
int broken_irq_mode;
};
struct i2c_adapter *adapter;
struct octeon_i2c *i2c;
adapter = i2c_get_adapter(0);
if (adapter == NULL)
return NULL;
i2c = container_of(adapter, struct octeon_i2c, adap);
return &i2c[twsi_id].adap;
#else
return NULL;
#endif
}
#endif
/**
* Do a twsi read from a 7 bit device address using an (optional) internal address.
* Up to 8 bytes can be read at a time.
*
* @param twsi_id which Octeon TWSI bus to use
* @param dev_addr Device address (7 bit)
* @param internal_addr
* Internal address. Can be 0, 1 or 2 bytes in width
* @param num_bytes Number of data bytes to read
* @param ia_width_bytes
* Internal address size in bytes (0, 1, or 2)
* @param data Pointer argument where the read data is returned.
*
* @return read data returned in 'data' argument
* Number of bytes read on success
* -1 on failure
*/
int cvmx_twsix_read_ia(int twsi_id, uint8_t dev_addr, uint16_t internal_addr, int num_bytes, int ia_width_bytes, uint64_t *data)
{
#ifdef CVMX_BUILD_FOR_LINUX_KERNEL
# if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
struct i2c_adapter *adapter;
u8 data_buf[8];
u8 addr_buf[8];
struct i2c_msg msg[2];
uint64_t r;
int i, j;
if (ia_width_bytes == 0)
return cvmx_twsix_read(twsi_id, dev_addr, num_bytes, data);
BUG_ON(ia_width_bytes > 2);
BUG_ON(num_bytes > 8 || num_bytes < 1);
adapter = __cvmx_twsix_get_adapter(twsi_id);
if (adapter == NULL)
return -1;
for (j = 0, i = ia_width_bytes - 1; i >= 0; i--, j++)
addr_buf[j] = (u8)(internal_addr >> (i * 8));
msg[0].addr = dev_addr;
msg[0].flags = 0;
msg[0].len = ia_width_bytes;
msg[0].buf = addr_buf;
msg[1].addr = dev_addr;
msg[1].flags = I2C_M_RD;
msg[1].len = num_bytes;
msg[1].buf = data_buf;
i = i2c_transfer(adapter, msg, 2);
i2c_put_adapter(adapter);
if (i == 2) {
r = 0;
for (i = 0; i < num_bytes; i++)
r = (r << 8) | data_buf[i];
*data = r;
return num_bytes;
} else {
return -1;
}
# else
BUG(); /* The I2C driver is not compiled in */
# endif
#else
cvmx_mio_twsx_sw_twsi_t sw_twsi_val;
cvmx_mio_twsx_sw_twsi_ext_t twsi_ext;
if (num_bytes < 1 || num_bytes > 8 || !data || ia_width_bytes < 0 || ia_width_bytes > 2)
return -1;
twsi_ext.u64 = 0;
sw_twsi_val.u64 = 0;
sw_twsi_val.s.v = 1;
sw_twsi_val.s.r = 1;
sw_twsi_val.s.sovr = 1;
sw_twsi_val.s.size = num_bytes - 1;
sw_twsi_val.s.a = dev_addr;
if (ia_width_bytes > 0) {
sw_twsi_val.s.op = 1;
sw_twsi_val.s.ia = (internal_addr >> 3) & 0x1f;
sw_twsi_val.s.eop_ia = internal_addr & 0x7;
}
if (ia_width_bytes == 2) {
sw_twsi_val.s.eia = 1;
twsi_ext.s.ia = internal_addr >> 8;
cvmx_write_csr(CVMX_MIO_TWSX_SW_TWSI_EXT(twsi_id), twsi_ext.u64);
}
cvmx_csr_db_decode(cvmx_get_proc_id(), CVMX_MIO_TWSX_SW_TWSI(twsi_id), sw_twsi_val.u64);
cvmx_write_csr(CVMX_MIO_TWSX_SW_TWSI(twsi_id), sw_twsi_val.u64);
while (((cvmx_mio_twsx_sw_twsi_t)(sw_twsi_val.u64 = cvmx_read_csr(CVMX_MIO_TWSX_SW_TWSI(twsi_id)))).s.v)
;
twsi_printf("Results:\n");
cvmx_csr_db_decode(cvmx_get_proc_id(), CVMX_MIO_TWSX_SW_TWSI(twsi_id), sw_twsi_val.u64);
if (!sw_twsi_val.s.r)
return -1;
*data = (sw_twsi_val.s.d & (0xFFFFFFFF >> (32 - num_bytes*8)));
if (num_bytes > 4) {
twsi_ext.u64 = cvmx_read_csr(CVMX_MIO_TWSX_SW_TWSI_EXT(twsi_id));
*data |= ((unsigned long long)(twsi_ext.s.d & (0xFFFFFFFF >> (32 - num_bytes*8))) << 32);
}
return num_bytes;
#endif
}
/**
* Read from a TWSI device (7 bit device address only) without generating any
* internal addresses.
* Read from 1-8 bytes and returns them in the data pointer.
*
* @param twsi_id TWSI interface on Octeon to use
* @param dev_addr TWSI device address (7 bit only)
* @param num_bytes number of bytes to read
* @param data Pointer to data read from TWSI device
*
* @return Number of bytes read on success
* -1 on error
*/
int cvmx_twsix_read(int twsi_id, uint8_t dev_addr, int num_bytes, uint64_t *data)
{
#ifdef CVMX_BUILD_FOR_LINUX_KERNEL
# if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
struct i2c_adapter *adapter;
u8 data_buf[8];
struct i2c_msg msg[1];
uint64_t r;
int i;
BUG_ON(num_bytes > 8 || num_bytes < 1);
adapter = __cvmx_twsix_get_adapter(twsi_id);
if (adapter == NULL)
return -1;
msg[0].addr = dev_addr;
msg[0].flags = I2C_M_RD;
msg[0].len = num_bytes;
msg[0].buf = data_buf;
i = i2c_transfer(adapter, msg, 1);
i2c_put_adapter(adapter);
if (i == 1) {
r = 0;
for (i = 0; i < num_bytes; i++)
r = (r << 8) | data_buf[i];
*data = r;
return num_bytes;
} else {
return -1;
}
# else
BUG(); /* The I2C driver is not compiled in */
# endif
#else
cvmx_mio_twsx_sw_twsi_t sw_twsi_val;
cvmx_mio_twsx_sw_twsi_ext_t twsi_ext;
if (num_bytes > 8 || num_bytes < 1)
return -1;
sw_twsi_val.u64 = 0;
sw_twsi_val.s.v = 1;
sw_twsi_val.s.r = 1;
sw_twsi_val.s.a = dev_addr;
sw_twsi_val.s.sovr = 1;
sw_twsi_val.s.size = num_bytes - 1;
cvmx_csr_db_decode(cvmx_get_proc_id(), CVMX_MIO_TWSX_SW_TWSI(twsi_id), sw_twsi_val.u64);
cvmx_write_csr(CVMX_MIO_TWSX_SW_TWSI(twsi_id), sw_twsi_val.u64);
while (((cvmx_mio_twsx_sw_twsi_t)(sw_twsi_val.u64 = cvmx_read_csr(CVMX_MIO_TWSX_SW_TWSI(twsi_id)))).s.v)
;
twsi_printf("Results:\n");
cvmx_csr_db_decode(cvmx_get_proc_id(), CVMX_MIO_TWSX_SW_TWSI(twsi_id), sw_twsi_val.u64);
if (!sw_twsi_val.s.r)
return -1;
*data = (sw_twsi_val.s.d & (0xFFFFFFFF >> (32 - num_bytes*8)));
if (num_bytes > 4) {
twsi_ext.u64 = cvmx_read_csr(CVMX_MIO_TWSX_SW_TWSI_EXT(twsi_id));
*data |= ((unsigned long long)(twsi_ext.s.d & (0xFFFFFFFF >> (32 - num_bytes*8))) << 32);
}
return num_bytes;
#endif
}
/**
* Perform a twsi write operation to a 7 bit device address.
*
* Note that many eeprom devices have page restrictions regarding address boundaries
* that can be crossed in one write operation. This is device dependent, and this routine
* does nothing in this regard.
* This command does not generate any internal addressess.
*
* @param twsi_id Octeon TWSI interface to use
* @param dev_addr TWSI device address
* @param num_bytes Number of bytes to write (between 1 and 8 inclusive)
* @param data Data to write
*
* @return 0 on success
* -1 on failure
*/
int cvmx_twsix_write(int twsi_id, uint8_t dev_addr, int num_bytes, uint64_t data)
{
#ifdef CVMX_BUILD_FOR_LINUX_KERNEL
# if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
struct i2c_adapter *adapter;
u8 data_buf[8];
struct i2c_msg msg[1];
int i, j;
BUG_ON(num_bytes > 8 || num_bytes < 1);
adapter = __cvmx_twsix_get_adapter(twsi_id);
if (adapter == NULL)
return -1;
for (j = 0, i = num_bytes - 1; i >= 0; i--, j++)
data_buf[j] = (u8)(data >> (i * 8));
msg[1].addr = dev_addr;
msg[1].flags = 0;
msg[1].len = num_bytes;
msg[1].buf = data_buf;
i = i2c_transfer(adapter, msg, 1);
i2c_put_adapter(adapter);
if (i == 1)
return num_bytes;
else
return -1;
# else
BUG(); /* The I2C driver is not compiled in */
# endif
#else
cvmx_mio_twsx_sw_twsi_t sw_twsi_val;
if (num_bytes > 8 || num_bytes < 1)
return -1;
sw_twsi_val.u64 = 0;
sw_twsi_val.s.v = 1;
sw_twsi_val.s.a = dev_addr;
sw_twsi_val.s.d = data & 0xffffffff;
sw_twsi_val.s.sovr = 1;
sw_twsi_val.s.size = num_bytes - 1;
if (num_bytes > 4) {
/* Upper four bytes go into a separate register */
cvmx_mio_twsx_sw_twsi_ext_t twsi_ext;
twsi_ext.u64 = 0;
twsi_ext.s.d = data >> 32;
cvmx_write_csr(CVMX_MIO_TWSX_SW_TWSI_EXT(twsi_id), twsi_ext.u64);
}
cvmx_csr_db_decode(cvmx_get_proc_id(), CVMX_MIO_TWSX_SW_TWSI(twsi_id), sw_twsi_val.u64);
cvmx_write_csr(CVMX_MIO_TWSX_SW_TWSI(twsi_id), sw_twsi_val.u64);
while (((cvmx_mio_twsx_sw_twsi_t)(sw_twsi_val.u64 = cvmx_read_csr(CVMX_MIO_TWSX_SW_TWSI(twsi_id)))).s.v)
;
twsi_printf("Results:\n");
cvmx_csr_db_decode(cvmx_get_proc_id(), CVMX_MIO_TWSX_SW_TWSI(twsi_id), sw_twsi_val.u64);
if (!sw_twsi_val.s.r)
return -1;
return 0;
#endif
}
/**
* Write 1-8 bytes to a TWSI device using an internal address.
*
* @param twsi_id which TWSI interface on Octeon to use
* @param dev_addr TWSI device address (7 bit only)
* @param internal_addr
* TWSI internal address (0, 8, or 16 bits)
* @param num_bytes Number of bytes to write (1-8)
* @param ia_width_bytes
* internal address width, in bytes (0, 1, 2)
* @param data Data to write. Data is written MSB first on the twsi bus, and only the lower
* num_bytes bytes of the argument are valid. (If a 2 byte write is done, only
* the low 2 bytes of the argument is used.
*
* @return Number of bytes read on success,
* -1 on error
*/
int cvmx_twsix_write_ia(int twsi_id, uint8_t dev_addr, uint16_t internal_addr, int num_bytes, int ia_width_bytes, uint64_t data)
{
#ifdef CVMX_BUILD_FOR_LINUX_KERNEL
# if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
struct i2c_adapter *adapter;
u8 data_buf[8];
u8 addr_buf[8];
struct i2c_msg msg[2];
int i, j;
if (ia_width_bytes == 0)
return cvmx_twsix_write(twsi_id, dev_addr, num_bytes, data);
BUG_ON(ia_width_bytes > 2);
BUG_ON(num_bytes > 8 || num_bytes < 1);
adapter = __cvmx_twsix_get_adapter(twsi_id);
if (adapter == NULL)
return -1;
for (j = 0, i = ia_width_bytes - 1; i >= 0; i--, j++)
addr_buf[j] = (u8)(internal_addr >> (i * 8));
for (j = 0, i = num_bytes - 1; i >= 0; i--, j++)
data_buf[j] = (u8)(data >> (i * 8));
msg[0].addr = dev_addr;
msg[0].flags = 0;
msg[0].len = ia_width_bytes;
msg[0].buf = addr_buf;
msg[1].addr = dev_addr;
msg[1].flags = 0;
msg[1].len = num_bytes;
msg[1].buf = data_buf;
i = i2c_transfer(adapter, msg, 2);
i2c_put_adapter(adapter);
if (i == 2) {
/* Poll until reads succeed, or polling times out */
int to = 100;
while (to-- > 0) {
uint64_t data;
if (cvmx_twsix_read(twsi_id, dev_addr, 1, &data) >= 0)
break;
}
}
if (i == 2)
return num_bytes;
else
return -1;
# else
BUG(); /* The I2C driver is not compiled in */
# endif
#else
cvmx_mio_twsx_sw_twsi_t sw_twsi_val;
cvmx_mio_twsx_sw_twsi_ext_t twsi_ext;
int to;
if (num_bytes < 1 || num_bytes > 8 || ia_width_bytes < 0 || ia_width_bytes > 2)
return -1;
twsi_ext.u64 = 0;
sw_twsi_val.u64 = 0;
sw_twsi_val.s.v = 1;
sw_twsi_val.s.sovr = 1;
sw_twsi_val.s.size = num_bytes - 1;
sw_twsi_val.s.a = dev_addr;
sw_twsi_val.s.d = 0xFFFFFFFF & data;
if (ia_width_bytes > 0) {
sw_twsi_val.s.op = 1;
sw_twsi_val.s.ia = (internal_addr >> 3) & 0x1f;
sw_twsi_val.s.eop_ia = internal_addr & 0x7;
}
if (ia_width_bytes == 2) {
sw_twsi_val.s.eia = 1;
twsi_ext.s.ia = internal_addr >> 8;
}
if (num_bytes > 4)
twsi_ext.s.d = data >> 32;
twsi_printf("%s: twsi_id=%x, dev_addr=%x, internal_addr=%x\n\tnum_bytes=%d, ia_width_bytes=%d, data=%lx\n",
__FUNCTION__, twsi_id, dev_addr, internal_addr, num_bytes, ia_width_bytes, data);
cvmx_csr_db_decode(cvmx_get_proc_id(), CVMX_MIO_TWSX_SW_TWSI_EXT(twsi_id), twsi_ext.u64);
cvmx_write_csr(CVMX_MIO_TWSX_SW_TWSI_EXT(twsi_id), twsi_ext.u64);
cvmx_csr_db_decode(cvmx_get_proc_id(), CVMX_MIO_TWSX_SW_TWSI(twsi_id), sw_twsi_val.u64);
cvmx_write_csr(CVMX_MIO_TWSX_SW_TWSI(twsi_id), sw_twsi_val.u64);
while (((cvmx_mio_twsx_sw_twsi_t)(sw_twsi_val.u64 = cvmx_read_csr(CVMX_MIO_TWSX_SW_TWSI(twsi_id)))).s.v)
;
twsi_printf("Results:\n");
cvmx_csr_db_decode(cvmx_get_proc_id(), CVMX_MIO_TWSX_SW_TWSI(twsi_id), sw_twsi_val.u64);
/* Poll until reads succeed, or polling times out */
to = 100;
while (to-- > 0) {
uint64_t data;
if (cvmx_twsix_read(twsi_id, dev_addr, 1, &data) >= 0)
break;
}
if (to <= 0)
return -1;
return num_bytes;
#endif
}