diff options
Diffstat (limited to 'meta-ibs/meta-common/recipes-core/interfaces/libmctp/smbus.c')
| -rw-r--r-- | meta-ibs/meta-common/recipes-core/interfaces/libmctp/smbus.c | 467 |
1 files changed, 0 insertions, 467 deletions
diff --git a/meta-ibs/meta-common/recipes-core/interfaces/libmctp/smbus.c b/meta-ibs/meta-common/recipes-core/interfaces/libmctp/smbus.c deleted file mode 100644 index 2f099a7e52..0000000000 --- a/meta-ibs/meta-common/recipes-core/interfaces/libmctp/smbus.c +++ /dev/null @@ -1,467 +0,0 @@ -/* SPDX-License-Identifier: Apache-2.0 */ - -#include <assert.h> -#include <stdbool.h> -#include <stdio.h> -#include <stdlib.h> -#include <string.h> -#include <unistd.h> - -#ifdef MCTP_HAVE_FILEIO -#include <fcntl.h> -#endif - -#define pr_fmt(x) "smbus: " x - -#include <i2c/smbus.h> -#include <linux/i2c-dev.h> -#include <linux/i2c.h> -#include <sys/ioctl.h> - -#include "libmctp-alloc.h" -#include "libmctp-log.h" -#include "libmctp-smbus.h" -#include "libmctp.h" - -struct mctp_binding_smbus { - struct mctp_binding binding; - int out_fd; - int in_fd; - - unsigned long bus_id; - - /* receive buffer */ - uint8_t rxbuf[1024]; - struct mctp_pktbuf *rx_pkt; - - /* temporary transmit buffer */ - uint8_t txbuf[256]; -}; - -#ifndef container_of -#define container_of(ptr, type, member) \ - (type *)((char *)(ptr) - (char *)&((type *)0)->member) -#endif - -#define binding_to_smbus(b) container_of(b, struct mctp_binding_smbus, binding) - -#define MCTP_COMMAND_CODE 0x0F -#define MCTP_SLAVE_ADDRESS 0x1d -#define MCTP_SOURCE_SLAVE_ADDRESS 0x21 - -#define SMBUS_PEC_BYTE_SIZE 1 -#define SMBUS_COMMAND_CODE_SIZE 1 -#define SMBUS_LENGTH_FIELD_SIZE 1 -#define SMBUS_ADDR_OFFSET_SLAVE 0x1000 - -struct mctp_smbus_header_tx { - uint8_t source_slave_address; -}; - -struct mctp_smbus_header_rx { - uint8_t destination_slave_address; - uint8_t command_code; - uint8_t byte_count; - uint8_t source_slave_address; -}; - -#define POLYCHECK (0x1070U << 3) -static uint8_t crc8_calculate(uint16_t d) -{ - int i; - - for (i = 0; i < 8; i++) { - if (d & 0x8000) { - d = d ^ POLYCHECK; - } - d = d << 1; - } - - return (uint8_t)(d >> 8); -} - -/* Incremental CRC8 over count bytes in the array pointed to by p */ -static uint8_t pec_calculate(uint8_t crc, uint8_t *p, size_t count) -{ - int i; - - for (i = 0; i < count; i++) { - crc = crc8_calculate((crc ^ p[i]) << 8); - } - - return crc; -} - -static uint8_t calculate_pec_byte(uint8_t *buf, size_t len, uint8_t address, - uint16_t flags) -{ - uint8_t addr = (address << 1) | (flags & I2C_M_RD ? 1 : 0); - uint8_t pec = pec_calculate(0, &addr, 1); - pec = pec_calculate(pec, buf, len); - - return pec; -} - -static int mctp_smbus_tx(struct mctp_binding_smbus *smbus, uint8_t len) -{ - -#ifdef I2C_M_HOLD - /* Hold message */ - static uint16_t holdtimeout = 1000; // timeout in ms. - struct i2c_msg msg[2] = -#else // !I2C_M_HOLD - struct i2c_msg msg[1] = -#endif // I2C_M_HOLD - {{.addr = MCTP_SLAVE_ADDRESS, - .flags = 0, - .len = len, - .buf = (__uint8_t *)smbus->txbuf} -#ifdef I2C_M_HOLD - , - {.addr = 0, - .flags = I2C_M_HOLD, - .len = sizeof(holdtimeout), - .buf = (__uint8_t *)&holdtimeout} -#endif // I2C_M_HOLD - }; - -#ifdef I2C_M_HOLD - struct i2c_rdwr_ioctl_data msgrdwr = {&msg, 2}; -#else // !I2C_M_HOLD - struct i2c_rdwr_ioctl_data msgrdwr = {&msg, 1}; -#endif // I2C_M_HOLD - - return ioctl(smbus->out_fd, I2C_RDWR, &msgrdwr); -} - -#ifdef I2C_M_HOLD -static int mctp_smbus_unhold_bus(struct mctp_binding_smbus *smbus) -{ - /* Unhold message */ - static uint16_t holdtimeout = 0; // unhold - struct i2c_msg holdmsg = {0, I2C_M_HOLD, sizeof(holdtimeout), - (__uint8_t *)&holdtimeout}; - - struct i2c_rdwr_ioctl_data msgrdwr = {&holdmsg, 1}; - - return ioctl(smbus->out_fd, I2C_RDWR, &msgrdwr); -} -#endif // I2C_M_HOLD - -static int mctp_binding_smbus_tx(struct mctp_binding *b, - struct mctp_pktbuf *pkt) -{ - struct mctp_binding_smbus *smbus = binding_to_smbus(b); - struct mctp_smbus_header_tx *hdr; - size_t pkt_length; - - uint8_t i2c_message_buf[256]; - uint8_t *buf_ptr; - uint8_t i2c_message_len; - - uint16_t timeout = 1000; - - /* the length field in the header excludes smbus framing - * and escape sequences */ - pkt_length = mctp_pktbuf_size(pkt); - - buf_ptr = (void *)smbus->txbuf; - *buf_ptr = MCTP_COMMAND_CODE; - buf_ptr++; - *buf_ptr = pkt_length + sizeof(*hdr); - buf_ptr++; - - hdr = (void *)buf_ptr; - hdr->source_slave_address = MCTP_SOURCE_SLAVE_ADDRESS; - buf_ptr = (buf_ptr + sizeof(*hdr)); - memcpy(buf_ptr, &pkt->data[pkt->start], pkt_length); - buf_ptr = buf_ptr + pkt_length; - - uint8_t pec_byte = calculate_pec_byte( - smbus->txbuf, - SMBUS_COMMAND_CODE_SIZE + SMBUS_LENGTH_FIELD_SIZE + sizeof(*hdr) - + pkt_length, - MCTP_SLAVE_ADDRESS, 0); - - *buf_ptr = pec_byte; - - i2c_message_len = SMBUS_COMMAND_CODE_SIZE + SMBUS_LENGTH_FIELD_SIZE - + sizeof(*hdr) + pkt_length - + SMBUS_PEC_BYTE_SIZE; // command code, length, - // header, data, pec byte - - if (mctp_smbus_tx(smbus, i2c_message_len)) { - mctp_prerr("Can't hold mux"); - return -1; - } - - return 0; -} - -#ifdef MCTP_HAVE_FILEIO -int mctp_smbus_read(struct mctp_binding_smbus *smbus) -{ - ssize_t len = 0; - struct mctp_smbus_header_rx *hdr; - int ret = 0; - - do { - ret = lseek(smbus->in_fd, 0, SEEK_SET); - if (ret < 0) { - mctp_prerr("Failed to seek"); - ret = -1; - } - - len = read(smbus->in_fd, smbus->rxbuf, sizeof(smbus->rxbuf)); - if (len < sizeof(*hdr)) { - // This condition hits from from time to time, even with - // a properly written poll loop, although it's not clear - // why. Return an error so that the upper layer can - // retry. - ret = 0; - break; - } - - hdr = (void *)smbus->rxbuf; - if (hdr->destination_slave_address - != (MCTP_SOURCE_SLAVE_ADDRESS & ~1)) { - mctp_prerr("Got bad slave address %d", - hdr->destination_slave_address); - ret = 0; - break; - } - if (hdr->command_code != MCTP_COMMAND_CODE) { - mctp_prerr("Got bad command code %d", - hdr->command_code); - // Not a payload intended for us - ret = 0; - break; - } - - if (hdr->byte_count != (len - sizeof(*hdr))) { - // Got an incorrectly sized payload - mctp_prerr("Got smbus payload sized %d, expecting %d", - hdr->byte_count, len - sizeof(*hdr)); - ret = 0; - break; - } - - if (len < 0) { - mctp_prerr("can't read from smbus device: %m"); - ret = -1; - break; - } - - smbus->rx_pkt = mctp_pktbuf_alloc(&(smbus->binding), 0); - assert(smbus->rx_pkt); - - if (mctp_pktbuf_push(smbus->rx_pkt, &smbus->rxbuf[sizeof(*hdr)], - len - sizeof(*hdr) - SMBUS_PEC_BYTE_SIZE) - != 0) { - mctp_prerr("Can't push tok pktbuf: %m"); - ret = -1; - break; - } - - mctp_bus_rx(&(smbus->binding), smbus->rx_pkt); - - smbus->rx_pkt = NULL; - - } while (0); - -#ifdef I2C_M_HOLD - if (mctp_smbus_unhold_bus(smbus)) { - mctp_prerr("Can't hold mux"); - ret = -1; - } -#endif // I2C_M_HOLD - - return ret; -} - -int mctp_smbus_get_in_fd(struct mctp_binding_smbus *smbus) -{ - return smbus->in_fd; -} - - -int mctp_smbus_set_in_fd(struct mctp_binding_smbus *smbus, int fd) -{ - smbus->in_fd = fd; -} - -int mctp_smbus_set_out_fd(struct mctp_binding_smbus *smbus, int fd) -{ - smbus->out_fd = fd; -} - -int mctp_smbus_get_out_fd(struct mctp_binding_smbus *smbus) -{ - return smbus->out_fd; -} - -int mctp_smbus_open_in_bus(struct mctp_binding_smbus *smbus, int in_bus) -{ - char filename[60]; - size_t filename_size = 0; - char slave_mqueue[20]; - size_t mqueue_size = 0; - int fd = 0; - size_t size = sizeof(filename); - int address_7_bit = MCTP_SOURCE_SLAVE_ADDRESS >> 1; - int ret = -1; - - snprintf(filename, size, - "/sys/bus/i2c/devices/i2c-%d/%d-%04x/slave-mqueue", in_bus, - in_bus, SMBUS_ADDR_OFFSET_SLAVE | address_7_bit); - - ret = open(filename, O_RDONLY | O_NONBLOCK | O_CLOEXEC); - if (ret >= 0) { - return ret; - } - - // Device doesn't exist. Create it. - filename_size = sizeof(filename); - snprintf(filename, filename_size, - "/sys/bus/i2c/devices/i2c-%d/new_device", in_bus); - filename[filename_size - 1] = '\0'; - - fd = open(filename, O_WRONLY); - if (fd < 0) { - mctp_prerr("can't open root device %s: %m", filename); - return -1; - } - - mqueue_size = sizeof(slave_mqueue); - snprintf(slave_mqueue, mqueue_size, "slave-mqueue %#04x", - SMBUS_ADDR_OFFSET_SLAVE | address_7_bit); - - size = write(fd, slave_mqueue, mqueue_size); - close(fd); - if (size != mqueue_size) { - mctp_prerr("can't create mqueue device on %s: %m", filename); - return -1; - } - - size = sizeof(filename); - snprintf(filename, size, - "/sys/bus/i2c/devices/i2c-%d/%d-%04x/slave-mqueue", in_bus, - in_bus, SMBUS_ADDR_OFFSET_SLAVE | address_7_bit); - - return open(filename, O_RDONLY | O_NONBLOCK | O_CLOEXEC); -} - -int mctp_smbus_open_out_bus(struct mctp_binding_smbus *smbus, int out_bus) -{ - char filename[60]; - size_t size = sizeof(filename); - snprintf(filename, size, "/dev/i2c-%d", out_bus); - filename[size - 1] = '\0'; - - return open(filename, O_RDWR | O_NONBLOCK); -} - -/* -int mctp_smbus_open_bus(struct mctp_binding_smbus *smbus, int out_bus_num, - int root_bus_num) -{ - char filename[60]; - size_t filename_size = 0; - char slave_mqueue[20]; - size_t mqueue_size = 0; - int fd = 0; - size_t size = sizeof(filename); - int address_7_bit = MCTP_SOURCE_SLAVE_ADDRESS >> 1; - - snprintf(filename, size, - "/sys/bus/i2c/devices/i2c-%d/%d-%04x/slave-mqueue", - root_bus_num, root_bus_num, - SMBUS_ADDR_OFFSET_SLAVE | address_7_bit); - - smbus->in_fd = open(filename, O_RDONLY | O_NONBLOCK | O_CLOEXEC); - if (smbus->in_fd < 0) { - // Device doesn't exist. Create it. - filename_size = sizeof(filename); - snprintf(filename, filename_size, - "/sys/bus/i2c/devices/i2c-%d/new_device", - root_bus_num); - filename[filename_size - 1] = '\0'; - - fd = open(filename, O_WRONLY); - if (fd < 0) { - mctp_prerr("can't open root device %s: %m", filename); - return -1; - } - - mqueue_size = sizeof(slave_mqueue); - snprintf(slave_mqueue, mqueue_size, "slave-mqueue %#04x", - SMBUS_ADDR_OFFSET_SLAVE | address_7_bit); - - size = write(fd, slave_mqueue, mqueue_size); - close(fd); - if (size != mqueue_size) { - mctp_prerr("can't create mqueue device on %s: %m", - filename); - return -1; - } - - size = sizeof(filename); - snprintf(filename, size, - "/sys/bus/i2c/devices/i2c-%d/%d-%04x/slave-mqueue", - root_bus_num, root_bus_num, - SMBUS_ADDR_OFFSET_SLAVE | address_7_bit); - - smbus->in_fd = - open(filename, O_RDONLY | O_NONBLOCK | O_CLOEXEC); - if (smbus->in_fd < 0) { - mctp_prerr("can't open mqueue device on %s: %m", - filename); - return -2; - } - } - - size = sizeof(filename); - snprintf(filename, size, "/dev/i2c-%d", out_bus_num); - filename[size - 1] = '\0'; - - smbus->out_fd = open(filename, O_RDWR | O_NONBLOCK); - if (smbus->out_fd < 0) { - close(smbus->in_fd); - mctp_prerr("can't open device %s: %m", filename); - } - - return 0; -} -*/ -#endif - -void mctp_smbus_register_bus(struct mctp_binding_smbus *smbus, - struct mctp *mctp, mctp_eid_t eid) -{ - smbus->bus_id = mctp_register_bus(mctp, &smbus->binding, eid); - mctp_binding_set_tx_enabled(&smbus->binding, true); -} - -struct mctp_binding_smbus *mctp_smbus_init(void) -{ - struct mctp_binding_smbus *smbus; - - smbus = __mctp_alloc(sizeof(*smbus)); - memset(&(smbus->binding), 0, sizeof(smbus->binding)); - - smbus->in_fd = -1; - smbus->out_fd = -1; - - smbus->rx_pkt = NULL; - smbus->binding.name = "smbus"; - smbus->binding.version = 1; - smbus->binding.pkt_size = sizeof(smbus->rxbuf); - - smbus->binding.tx = mctp_binding_smbus_tx; - return smbus; -} - -void mctp_smbus_free(struct mctp_binding_smbus *smbus) -{ - __mctp_free(smbus); -} |