6b13f685e
김민수
BSP 최초 추가
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#include <common.h>
#include <dm.h>
#include <errno.h>
#include <fdtdec.h>
#include <i2c.h>
#include <malloc.h>
#include <dm/device-internal.h>
#include <dm/lists.h>
#include <dm/root.h>
DECLARE_GLOBAL_DATA_PTR;
#define I2C_MAX_OFFSET_LEN 4
static int i2c_setup_offset(struct dm_i2c_chip *chip, uint offset,
uint8_t offset_buf[], struct i2c_msg *msg)
{
int offset_len;
msg->addr = chip->chip_addr;
msg->flags = chip->flags & DM_I2C_CHIP_10BIT ? I2C_M_TEN : 0;
msg->len = chip->offset_len;
msg->buf = offset_buf;
if (!chip->offset_len)
return -EADDRNOTAVAIL;
assert(chip->offset_len <= I2C_MAX_OFFSET_LEN);
offset_len = chip->offset_len;
while (offset_len--)
*offset_buf++ = offset >> (8 * offset_len);
return 0;
}
static int i2c_read_bytewise(struct udevice *dev, uint offset,
uint8_t *buffer, int len)
{
struct dm_i2c_chip *chip = dev_get_parent_platdata(dev);
struct udevice *bus = dev_get_parent(dev);
struct dm_i2c_ops *ops = i2c_get_ops(bus);
struct i2c_msg msg[2], *ptr;
uint8_t offset_buf[I2C_MAX_OFFSET_LEN];
int ret;
int i;
for (i = 0; i < len; i++) {
if (i2c_setup_offset(chip, offset + i, offset_buf, msg))
return -EINVAL;
ptr = msg + 1;
ptr->addr = chip->chip_addr;
ptr->flags = msg->flags | I2C_M_RD;
ptr->len = 1;
ptr->buf = &buffer[i];
ptr++;
ret = ops->xfer(bus, msg, ptr - msg);
if (ret)
return ret;
}
return 0;
}
static int i2c_write_bytewise(struct udevice *dev, uint offset,
const uint8_t *buffer, int len)
{
struct dm_i2c_chip *chip = dev_get_parent_platdata(dev);
struct udevice *bus = dev_get_parent(dev);
struct dm_i2c_ops *ops = i2c_get_ops(bus);
struct i2c_msg msg[1];
uint8_t buf[I2C_MAX_OFFSET_LEN + 1];
int ret;
int i;
for (i = 0; i < len; i++) {
if (i2c_setup_offset(chip, offset + i, buf, msg))
return -EINVAL;
buf[msg->len++] = buffer[i];
ret = ops->xfer(bus, msg, 1);
if (ret)
return ret;
}
return 0;
}
int dm_i2c_read(struct udevice *dev, uint offset, uint8_t *buffer, int len)
{
struct dm_i2c_chip *chip = dev_get_parent_platdata(dev);
struct udevice *bus = dev_get_parent(dev);
struct dm_i2c_ops *ops = i2c_get_ops(bus);
struct i2c_msg msg[2], *ptr;
uint8_t offset_buf[I2C_MAX_OFFSET_LEN];
int msg_count;
if (!ops->xfer)
return -ENOSYS;
if (chip->flags & DM_I2C_CHIP_RD_ADDRESS)
return i2c_read_bytewise(dev, offset, buffer, len);
ptr = msg;
if (!i2c_setup_offset(chip, offset, offset_buf, ptr))
ptr++;
if (len) {
ptr->addr = chip->chip_addr;
ptr->flags = chip->flags & DM_I2C_CHIP_10BIT ? I2C_M_TEN : 0;
ptr->flags |= I2C_M_RD;
ptr->len = len;
ptr->buf = buffer;
ptr++;
}
msg_count = ptr - msg;
return ops->xfer(bus, msg, msg_count);
}
int dm_i2c_write(struct udevice *dev, uint offset, const uint8_t *buffer,
int len)
{
struct dm_i2c_chip *chip = dev_get_parent_platdata(dev);
struct udevice *bus = dev_get_parent(dev);
struct dm_i2c_ops *ops = i2c_get_ops(bus);
struct i2c_msg msg[1];
if (!ops->xfer)
return -ENOSYS;
if (chip->flags & DM_I2C_CHIP_WR_ADDRESS)
return i2c_write_bytewise(dev, offset, buffer, len);
if (len < 64) {
uint8_t buf[I2C_MAX_OFFSET_LEN + len];
i2c_setup_offset(chip, offset, buf, msg);
msg->len += len;
memcpy(buf + chip->offset_len, buffer, len);
return ops->xfer(bus, msg, 1);
} else {
uint8_t *buf;
int ret;
buf = malloc(I2C_MAX_OFFSET_LEN + len);
if (!buf)
return -ENOMEM;
i2c_setup_offset(chip, offset, buf, msg);
msg->len += len;
memcpy(buf + chip->offset_len, buffer, len);
ret = ops->xfer(bus, msg, 1);
free(buf);
return ret;
}
}
static int i2c_probe_chip(struct udevice *bus, uint chip_addr,
enum dm_i2c_chip_flags chip_flags)
{
struct dm_i2c_ops *ops = i2c_get_ops(bus);
struct i2c_msg msg[1];
int ret;
if (ops->probe_chip) {
ret = ops->probe_chip(bus, chip_addr, chip_flags);
if (!ret || ret != -ENOSYS)
return ret;
}
if (!ops->xfer)
return -ENOSYS;
msg->addr = chip_addr;
msg->flags = chip_flags & DM_I2C_CHIP_10BIT ? I2C_M_TEN : 0;
msg->len = 0;
msg->buf = NULL;
return ops->xfer(bus, msg, 1);
}
static int i2c_bind_driver(struct udevice *bus, uint chip_addr, uint offset_len,
struct udevice **devp)
{
struct dm_i2c_chip *chip;
char name[30], *str;
struct udevice *dev;
int ret;
snprintf(name, sizeof(name), "generic_%x", chip_addr);
str = strdup(name);
if (!str)
return -ENOMEM;
ret = device_bind_driver(bus, "i2c_generic_chip_drv", str, &dev);
debug("%s: device_bind_driver: ret=%d
", __func__, ret);
if (ret)
goto err_bind;
chip = dev_get_parent_platdata(dev);
chip->chip_addr = chip_addr;
chip->offset_len = offset_len;
ret = device_probe(dev);
debug("%s: device_probe: ret=%d
", __func__, ret);
if (ret)
goto err_probe;
*devp = dev;
return 0;
err_probe:
device_unbind(dev);
err_bind:
free(str);
return ret;
}
int i2c_get_chip(struct udevice *bus, uint chip_addr, uint offset_len,
struct udevice **devp)
{
struct udevice *dev;
debug("%s: Searching bus '%s' for address %02x: ", __func__,
bus->name, chip_addr);
for (device_find_first_child(bus, &dev); dev;
device_find_next_child(&dev)) {
struct dm_i2c_chip *chip = dev_get_parent_platdata(dev);
int ret;
if (chip->chip_addr == chip_addr) {
ret = device_probe(dev);
debug("found, ret=%d
", ret);
if (ret)
return ret;
*devp = dev;
return 0;
}
}
debug("not found
");
return i2c_bind_driver(bus, chip_addr, offset_len, devp);
}
int i2c_get_chip_for_busnum(int busnum, int chip_addr, uint offset_len,
struct udevice **devp)
{
struct udevice *bus;
int ret;
ret = uclass_get_device_by_seq(UCLASS_I2C, busnum, &bus);
if (ret) {
debug("Cannot find I2C bus %d
", busnum);
return ret;
}
ret = i2c_get_chip(bus, chip_addr, offset_len, devp);
if (ret) {
debug("Cannot find I2C chip %02x on bus %d
", chip_addr,
busnum);
return ret;
}
return 0;
}
int dm_i2c_probe(struct udevice *bus, uint chip_addr, uint chip_flags,
struct udevice **devp)
{
int ret;
*devp = NULL;
ret = i2c_probe_chip(bus, chip_addr, chip_flags);
debug("%s: bus='%s', address %02x, ret=%d
", __func__, bus->name,
chip_addr, ret);
if (ret)
return ret;
ret = i2c_get_chip(bus, chip_addr, 1, devp);
debug("%s: i2c_get_chip: ret=%d
", __func__, ret);
return ret;
}
int dm_i2c_set_bus_speed(struct udevice *bus, unsigned int speed)
{
struct dm_i2c_ops *ops = i2c_get_ops(bus);
struct dm_i2c_bus *i2c = bus->uclass_priv;
int ret;
if (ops->set_bus_speed) {
ret = ops->set_bus_speed(bus, speed);
if (ret)
return ret;
}
i2c->speed_hz = speed;
return 0;
}
int dm_i2c_get_bus_speed(struct udevice *bus)
{
struct dm_i2c_ops *ops = i2c_get_ops(bus);
struct dm_i2c_bus *i2c = bus->uclass_priv;
if (!ops->get_bus_speed)
return i2c->speed_hz;
return ops->get_bus_speed(bus);
}
int i2c_set_chip_flags(struct udevice *dev, uint flags)
{
struct udevice *bus = dev->parent;
struct dm_i2c_chip *chip = dev_get_parent_platdata(dev);
struct dm_i2c_ops *ops = i2c_get_ops(bus);
int ret;
if (ops->set_flags) {
ret = ops->set_flags(dev, flags);
if (ret)
return ret;
}
chip->flags = flags;
return 0;
}
int i2c_get_chip_flags(struct udevice *dev, uint *flagsp)
{
struct dm_i2c_chip *chip = dev_get_parent_platdata(dev);
*flagsp = chip->flags;
return 0;
}
int i2c_set_chip_offset_len(struct udevice *dev, uint offset_len)
{
struct dm_i2c_chip *chip = dev_get_parent_platdata(dev);
if (offset_len > I2C_MAX_OFFSET_LEN)
return -EINVAL;
chip->offset_len = offset_len;
return 0;
}
int i2c_deblock(struct udevice *bus)
{
struct dm_i2c_ops *ops = i2c_get_ops(bus);
if (!ops->deblock)
return -ENOSYS;
return ops->deblock(bus);
}
int i2c_chip_ofdata_to_platdata(const void *blob, int node,
struct dm_i2c_chip *chip)
{
chip->offset_len = fdtdec_get_int(gd->fdt_blob, node,
"u-boot,i2c-offset-len", 1);
chip->flags = 0;
chip->chip_addr = fdtdec_get_int(gd->fdt_blob, node, "reg", -1);
if (chip->chip_addr == -1) {
debug("%s: I2C Node '%s' has no 'reg' property
", __func__,
fdt_get_name(blob, node, NULL));
return -EINVAL;
}
return 0;
}
static int i2c_post_probe(struct udevice *dev)
{
struct dm_i2c_bus *i2c = dev->uclass_priv;
i2c->speed_hz = fdtdec_get_int(gd->fdt_blob, dev->of_offset,
"clock-frequency", 100000);
return dm_i2c_set_bus_speed(dev, i2c->speed_hz);
}
static int i2c_post_bind(struct udevice *dev)
{
return dm_scan_fdt_node(dev, gd->fdt_blob, dev->of_offset, false);
}
static int i2c_child_post_bind(struct udevice *dev)
{
struct dm_i2c_chip *plat = dev_get_parent_platdata(dev);
if (dev->of_offset == -1)
return 0;
return i2c_chip_ofdata_to_platdata(gd->fdt_blob, dev->of_offset, plat);
}
UCLASS_DRIVER(i2c) = {
.id = UCLASS_I2C,
.name = "i2c",
.flags = DM_UC_FLAG_SEQ_ALIAS,
.post_bind = i2c_post_bind,
.post_probe = i2c_post_probe,
.per_device_auto_alloc_size = sizeof(struct dm_i2c_bus),
.per_child_platdata_auto_alloc_size = sizeof(struct dm_i2c_chip),
.child_post_bind = i2c_child_post_bind,
};
UCLASS_DRIVER(i2c_generic) = {
.id = UCLASS_I2C_GENERIC,
.name = "i2c_generic",
};
U_BOOT_DRIVER(i2c_generic_chip_drv) = {
.name = "i2c_generic_chip_drv",
.id = UCLASS_I2C_GENERIC,
};
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