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coreboot-kgpe-d16/src/device/i2c_bus.c

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src/device: Use SPDX for GPL-2.0-only files Done with sed and God Lines. Only done for C-like code for now. Change-Id: Id5fe26564147ec532850430ea55b19ee94d5c5a5 Signed-off-by: Angel Pons <th3fanbus@gmail.com> Reviewed-on: https://review.coreboot.org/c/coreboot/+/40050 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: HAOUAS Elyes <ehaouas@noos.fr>
2020-04-02 23:48:16 +02:00
/* SPDX-License-Identifier: GPL-2.0-only */
Reinvent I2C ops Do not use the global platform_i2c_transfer() function that can only be implemented by a single driver. Instead, make a `struct device` aware transfer() function the only interface function for I2C controller dri- vers to implement. To not force the slave device drivers to be implemented either above generic I2C or specialized SMBus operations, we support SMBus control- lers in the slave device interface too. We start with four simple slave functions: i2c_readb(), i2c_writeb(), i2c_readb_at() and i2c_writeb_at(). They are all compatible to respec- tive SMBus functions. But we keep aliases because it would be weird to force e.g. an I2C EEPROM driver to call smbus_read_byte(). Change-Id: I98386f91bf4799ba3df84ec8bc0f64edd4142818 Signed-off-by: Nico Huber <nico.huber@secunet.com> Reviewed-on: https://review.coreboot.org/20846 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Aaron Durbin <adurbin@chromium.org> Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
2017-08-01 17:09:35 +02:00
#include <stdint.h>
#include <console/console.h>
#include <device/smbus.h>
#include <device/i2c_bus.h>
device/i2c_bus: Add i2c_dev_read_at16() i2c_dev_read_at16() sends a 16-bit offset to the I2C chip (for larger EEPROM parts), then reads bytes up to a given length into a buffer. Change-Id: I7516f3e5d9aca362c2b340aa5627d91510c09412 Signed-off-by: Nico Huber <nico.huber@secunet.com> Reviewed-on: https://review.coreboot.org/c/coreboot/+/29478 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
2017-11-01 13:15:33 +01:00
#include <commonlib/endian.h>
Reinvent I2C ops Do not use the global platform_i2c_transfer() function that can only be implemented by a single driver. Instead, make a `struct device` aware transfer() function the only interface function for I2C controller dri- vers to implement. To not force the slave device drivers to be implemented either above generic I2C or specialized SMBus operations, we support SMBus control- lers in the slave device interface too. We start with four simple slave functions: i2c_readb(), i2c_writeb(), i2c_readb_at() and i2c_writeb_at(). They are all compatible to respec- tive SMBus functions. But we keep aliases because it would be weird to force e.g. an I2C EEPROM driver to call smbus_read_byte(). Change-Id: I98386f91bf4799ba3df84ec8bc0f64edd4142818 Signed-off-by: Nico Huber <nico.huber@secunet.com> Reviewed-on: https://review.coreboot.org/20846 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Aaron Durbin <adurbin@chromium.org> Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
2017-08-01 17:09:35 +02:00
struct bus *i2c_link(struct device *const dev)
{
if (!dev || !dev->bus)
return NULL;
struct bus *link = dev->bus;
while (link) {
struct device *const parent = link->dev;
if (parent && parent->ops &&
(parent->ops->ops_i2c_bus || parent->ops->ops_smbus_bus))
break;
if (parent && parent->bus)
link = parent->bus;
else
link = NULL;
}
if (!link) {
printk(BIOS_ALERT, "%s Cannot find I2C or SMBus bus operations",
dev_path(dev));
}
return link;
}
device/i2c_bus: allow i2c_bus and i2c_simple to coexist If one wants to implement both i2c_bus.h and i2c_simple.h APIs the compilation unit needs to be guarded or coordinated carefully with different compilation units. Instead, name the i2c_bus functions with _dev such that it indicates that they operate on struct device. One other change to allow i2c_bus.h to be built in non-ramstage environments is to ensure DEVTREE_CONST is used for the dev field in struct bus. BUG=b:72121803 Change-Id: I267e27e62c95013e8ff8b0728dbe9e7b523de453 Signed-off-by: Aaron Durbin <adurbin@chromium.org> Reviewed-on: https://review.coreboot.org/23370 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Martin Roth <martinroth@google.com> Reviewed-by: Furquan Shaikh <furquan@google.com>
2018-01-23 05:24:35 +01:00
int i2c_dev_readb(struct device *const dev)
Reinvent I2C ops Do not use the global platform_i2c_transfer() function that can only be implemented by a single driver. Instead, make a `struct device` aware transfer() function the only interface function for I2C controller dri- vers to implement. To not force the slave device drivers to be implemented either above generic I2C or specialized SMBus operations, we support SMBus control- lers in the slave device interface too. We start with four simple slave functions: i2c_readb(), i2c_writeb(), i2c_readb_at() and i2c_writeb_at(). They are all compatible to respec- tive SMBus functions. But we keep aliases because it would be weird to force e.g. an I2C EEPROM driver to call smbus_read_byte(). Change-Id: I98386f91bf4799ba3df84ec8bc0f64edd4142818 Signed-off-by: Nico Huber <nico.huber@secunet.com> Reviewed-on: https://review.coreboot.org/20846 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Aaron Durbin <adurbin@chromium.org> Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
2017-08-01 17:09:35 +02:00
{
struct device *const busdev = i2c_busdev(dev);
if (!busdev)
return -1;
if (busdev->ops->ops_i2c_bus) {
uint8_t val;
const struct i2c_msg msg = {
.flags = I2C_M_RD,
.slave = dev->path.i2c.device,
.buf = &val,
.len = sizeof(val),
};
device: correct code style Revise the following aspects to follow coreboot's coding style: - Drop braces for single-statement condition and loop bodies. - Use `__func__` to print the current function's name. - Reflow pointer dereferences to fit in a single line. - Adjust the `*` position in pointer variable declarations. - Drop unnecessary `else` statements. BUG = N/A TEST = Build Compulab Intense-PC with secure oprom enabled Change-Id: I780251d946d5bea97658476d61d25555ec768dfc Signed-off-by: Frans Hendriks <fhendriks@eltan.com> Reviewed-on: https://review.coreboot.org/c/coreboot/+/49963 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Angel Pons <th3fanbus@gmail.com>
2021-02-01 11:44:37 +01:00
const int ret = busdev->ops->ops_i2c_bus->transfer(busdev, &msg, 1);
Reinvent I2C ops Do not use the global platform_i2c_transfer() function that can only be implemented by a single driver. Instead, make a `struct device` aware transfer() function the only interface function for I2C controller dri- vers to implement. To not force the slave device drivers to be implemented either above generic I2C or specialized SMBus operations, we support SMBus control- lers in the slave device interface too. We start with four simple slave functions: i2c_readb(), i2c_writeb(), i2c_readb_at() and i2c_writeb_at(). They are all compatible to respec- tive SMBus functions. But we keep aliases because it would be weird to force e.g. an I2C EEPROM driver to call smbus_read_byte(). Change-Id: I98386f91bf4799ba3df84ec8bc0f64edd4142818 Signed-off-by: Nico Huber <nico.huber@secunet.com> Reviewed-on: https://review.coreboot.org/20846 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Aaron Durbin <adurbin@chromium.org> Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
2017-08-01 17:09:35 +02:00
if (ret)
return ret;
else
return val;
} else if (busdev->ops->ops_smbus_bus->recv_byte) {
return busdev->ops->ops_smbus_bus->recv_byte(dev);
}
device: correct code style Revise the following aspects to follow coreboot's coding style: - Drop braces for single-statement condition and loop bodies. - Use `__func__` to print the current function's name. - Reflow pointer dereferences to fit in a single line. - Adjust the `*` position in pointer variable declarations. - Drop unnecessary `else` statements. BUG = N/A TEST = Build Compulab Intense-PC with secure oprom enabled Change-Id: I780251d946d5bea97658476d61d25555ec768dfc Signed-off-by: Frans Hendriks <fhendriks@eltan.com> Reviewed-on: https://review.coreboot.org/c/coreboot/+/49963 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Angel Pons <th3fanbus@gmail.com>
2021-02-01 11:44:37 +01:00
printk(BIOS_ERR, "%s Missing ops_smbus_bus->recv_byte", dev_path(busdev));
return -1;
Reinvent I2C ops Do not use the global platform_i2c_transfer() function that can only be implemented by a single driver. Instead, make a `struct device` aware transfer() function the only interface function for I2C controller dri- vers to implement. To not force the slave device drivers to be implemented either above generic I2C or specialized SMBus operations, we support SMBus control- lers in the slave device interface too. We start with four simple slave functions: i2c_readb(), i2c_writeb(), i2c_readb_at() and i2c_writeb_at(). They are all compatible to respec- tive SMBus functions. But we keep aliases because it would be weird to force e.g. an I2C EEPROM driver to call smbus_read_byte(). Change-Id: I98386f91bf4799ba3df84ec8bc0f64edd4142818 Signed-off-by: Nico Huber <nico.huber@secunet.com> Reviewed-on: https://review.coreboot.org/20846 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Aaron Durbin <adurbin@chromium.org> Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
2017-08-01 17:09:35 +02:00
}
device/i2c_bus: allow i2c_bus and i2c_simple to coexist If one wants to implement both i2c_bus.h and i2c_simple.h APIs the compilation unit needs to be guarded or coordinated carefully with different compilation units. Instead, name the i2c_bus functions with _dev such that it indicates that they operate on struct device. One other change to allow i2c_bus.h to be built in non-ramstage environments is to ensure DEVTREE_CONST is used for the dev field in struct bus. BUG=b:72121803 Change-Id: I267e27e62c95013e8ff8b0728dbe9e7b523de453 Signed-off-by: Aaron Durbin <adurbin@chromium.org> Reviewed-on: https://review.coreboot.org/23370 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Martin Roth <martinroth@google.com> Reviewed-by: Furquan Shaikh <furquan@google.com>
2018-01-23 05:24:35 +01:00
int i2c_dev_writeb(struct device *const dev, uint8_t val)
Reinvent I2C ops Do not use the global platform_i2c_transfer() function that can only be implemented by a single driver. Instead, make a `struct device` aware transfer() function the only interface function for I2C controller dri- vers to implement. To not force the slave device drivers to be implemented either above generic I2C or specialized SMBus operations, we support SMBus control- lers in the slave device interface too. We start with four simple slave functions: i2c_readb(), i2c_writeb(), i2c_readb_at() and i2c_writeb_at(). They are all compatible to respec- tive SMBus functions. But we keep aliases because it would be weird to force e.g. an I2C EEPROM driver to call smbus_read_byte(). Change-Id: I98386f91bf4799ba3df84ec8bc0f64edd4142818 Signed-off-by: Nico Huber <nico.huber@secunet.com> Reviewed-on: https://review.coreboot.org/20846 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Aaron Durbin <adurbin@chromium.org> Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
2017-08-01 17:09:35 +02:00
{
struct device *const busdev = i2c_busdev(dev);
if (!busdev)
return -1;
if (busdev->ops->ops_i2c_bus) {
const struct i2c_msg msg = {
.flags = 0,
.slave = dev->path.i2c.device,
.buf = &val,
.len = sizeof(val),
};
return busdev->ops->ops_i2c_bus->transfer(busdev, &msg, 1);
} else if (busdev->ops->ops_smbus_bus->send_byte) {
return busdev->ops->ops_smbus_bus->send_byte(dev, val);
}
device: correct code style Revise the following aspects to follow coreboot's coding style: - Drop braces for single-statement condition and loop bodies. - Use `__func__` to print the current function's name. - Reflow pointer dereferences to fit in a single line. - Adjust the `*` position in pointer variable declarations. - Drop unnecessary `else` statements. BUG = N/A TEST = Build Compulab Intense-PC with secure oprom enabled Change-Id: I780251d946d5bea97658476d61d25555ec768dfc Signed-off-by: Frans Hendriks <fhendriks@eltan.com> Reviewed-on: https://review.coreboot.org/c/coreboot/+/49963 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Angel Pons <th3fanbus@gmail.com>
2021-02-01 11:44:37 +01:00
printk(BIOS_ERR, "%s Missing ops_smbus_bus->send_byte",
dev_path(busdev));
return -1;
Reinvent I2C ops Do not use the global platform_i2c_transfer() function that can only be implemented by a single driver. Instead, make a `struct device` aware transfer() function the only interface function for I2C controller dri- vers to implement. To not force the slave device drivers to be implemented either above generic I2C or specialized SMBus operations, we support SMBus control- lers in the slave device interface too. We start with four simple slave functions: i2c_readb(), i2c_writeb(), i2c_readb_at() and i2c_writeb_at(). They are all compatible to respec- tive SMBus functions. But we keep aliases because it would be weird to force e.g. an I2C EEPROM driver to call smbus_read_byte(). Change-Id: I98386f91bf4799ba3df84ec8bc0f64edd4142818 Signed-off-by: Nico Huber <nico.huber@secunet.com> Reviewed-on: https://review.coreboot.org/20846 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Aaron Durbin <adurbin@chromium.org> Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
2017-08-01 17:09:35 +02:00
}
device/i2c_bus: allow i2c_bus and i2c_simple to coexist If one wants to implement both i2c_bus.h and i2c_simple.h APIs the compilation unit needs to be guarded or coordinated carefully with different compilation units. Instead, name the i2c_bus functions with _dev such that it indicates that they operate on struct device. One other change to allow i2c_bus.h to be built in non-ramstage environments is to ensure DEVTREE_CONST is used for the dev field in struct bus. BUG=b:72121803 Change-Id: I267e27e62c95013e8ff8b0728dbe9e7b523de453 Signed-off-by: Aaron Durbin <adurbin@chromium.org> Reviewed-on: https://review.coreboot.org/23370 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Martin Roth <martinroth@google.com> Reviewed-by: Furquan Shaikh <furquan@google.com>
2018-01-23 05:24:35 +01:00
int i2c_dev_readb_at(struct device *const dev, uint8_t off)
Reinvent I2C ops Do not use the global platform_i2c_transfer() function that can only be implemented by a single driver. Instead, make a `struct device` aware transfer() function the only interface function for I2C controller dri- vers to implement. To not force the slave device drivers to be implemented either above generic I2C or specialized SMBus operations, we support SMBus control- lers in the slave device interface too. We start with four simple slave functions: i2c_readb(), i2c_writeb(), i2c_readb_at() and i2c_writeb_at(). They are all compatible to respec- tive SMBus functions. But we keep aliases because it would be weird to force e.g. an I2C EEPROM driver to call smbus_read_byte(). Change-Id: I98386f91bf4799ba3df84ec8bc0f64edd4142818 Signed-off-by: Nico Huber <nico.huber@secunet.com> Reviewed-on: https://review.coreboot.org/20846 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Aaron Durbin <adurbin@chromium.org> Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
2017-08-01 17:09:35 +02:00
{
struct device *const busdev = i2c_busdev(dev);
if (!busdev)
return -1;
if (busdev->ops->ops_i2c_bus) {
uint8_t val;
const struct i2c_msg msg[] = {
{
.flags = 0,
.slave = dev->path.i2c.device,
.buf = &off,
.len = sizeof(off),
},
{
.flags = I2C_M_RD,
.slave = dev->path.i2c.device,
.buf = &val,
.len = sizeof(val),
},
};
device: correct code style Revise the following aspects to follow coreboot's coding style: - Drop braces for single-statement condition and loop bodies. - Use `__func__` to print the current function's name. - Reflow pointer dereferences to fit in a single line. - Adjust the `*` position in pointer variable declarations. - Drop unnecessary `else` statements. BUG = N/A TEST = Build Compulab Intense-PC with secure oprom enabled Change-Id: I780251d946d5bea97658476d61d25555ec768dfc Signed-off-by: Frans Hendriks <fhendriks@eltan.com> Reviewed-on: https://review.coreboot.org/c/coreboot/+/49963 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Angel Pons <th3fanbus@gmail.com>
2021-02-01 11:44:37 +01:00
const int ret = busdev->ops->ops_i2c_bus->transfer(busdev, msg,
ARRAY_SIZE(msg));
Reinvent I2C ops Do not use the global platform_i2c_transfer() function that can only be implemented by a single driver. Instead, make a `struct device` aware transfer() function the only interface function for I2C controller dri- vers to implement. To not force the slave device drivers to be implemented either above generic I2C or specialized SMBus operations, we support SMBus control- lers in the slave device interface too. We start with four simple slave functions: i2c_readb(), i2c_writeb(), i2c_readb_at() and i2c_writeb_at(). They are all compatible to respec- tive SMBus functions. But we keep aliases because it would be weird to force e.g. an I2C EEPROM driver to call smbus_read_byte(). Change-Id: I98386f91bf4799ba3df84ec8bc0f64edd4142818 Signed-off-by: Nico Huber <nico.huber@secunet.com> Reviewed-on: https://review.coreboot.org/20846 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Aaron Durbin <adurbin@chromium.org> Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
2017-08-01 17:09:35 +02:00
if (ret)
return ret;
else
return val;
} else if (busdev->ops->ops_smbus_bus->read_byte) {
return busdev->ops->ops_smbus_bus->read_byte(dev, off);
}
device: correct code style Revise the following aspects to follow coreboot's coding style: - Drop braces for single-statement condition and loop bodies. - Use `__func__` to print the current function's name. - Reflow pointer dereferences to fit in a single line. - Adjust the `*` position in pointer variable declarations. - Drop unnecessary `else` statements. BUG = N/A TEST = Build Compulab Intense-PC with secure oprom enabled Change-Id: I780251d946d5bea97658476d61d25555ec768dfc Signed-off-by: Frans Hendriks <fhendriks@eltan.com> Reviewed-on: https://review.coreboot.org/c/coreboot/+/49963 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Angel Pons <th3fanbus@gmail.com>
2021-02-01 11:44:37 +01:00
printk(BIOS_ERR, "%s Missing ops_smbus_bus->read_byte", dev_path(busdev));
return -1;
Reinvent I2C ops Do not use the global platform_i2c_transfer() function that can only be implemented by a single driver. Instead, make a `struct device` aware transfer() function the only interface function for I2C controller dri- vers to implement. To not force the slave device drivers to be implemented either above generic I2C or specialized SMBus operations, we support SMBus control- lers in the slave device interface too. We start with four simple slave functions: i2c_readb(), i2c_writeb(), i2c_readb_at() and i2c_writeb_at(). They are all compatible to respec- tive SMBus functions. But we keep aliases because it would be weird to force e.g. an I2C EEPROM driver to call smbus_read_byte(). Change-Id: I98386f91bf4799ba3df84ec8bc0f64edd4142818 Signed-off-by: Nico Huber <nico.huber@secunet.com> Reviewed-on: https://review.coreboot.org/20846 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Aaron Durbin <adurbin@chromium.org> Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
2017-08-01 17:09:35 +02:00
}
device: correct code style Revise the following aspects to follow coreboot's coding style: - Drop braces for single-statement condition and loop bodies. - Use `__func__` to print the current function's name. - Reflow pointer dereferences to fit in a single line. - Adjust the `*` position in pointer variable declarations. - Drop unnecessary `else` statements. BUG = N/A TEST = Build Compulab Intense-PC with secure oprom enabled Change-Id: I780251d946d5bea97658476d61d25555ec768dfc Signed-off-by: Frans Hendriks <fhendriks@eltan.com> Reviewed-on: https://review.coreboot.org/c/coreboot/+/49963 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Angel Pons <th3fanbus@gmail.com>
2021-02-01 11:44:37 +01:00
int i2c_dev_writeb_at(struct device *const dev, const uint8_t off, const uint8_t val)
Reinvent I2C ops Do not use the global platform_i2c_transfer() function that can only be implemented by a single driver. Instead, make a `struct device` aware transfer() function the only interface function for I2C controller dri- vers to implement. To not force the slave device drivers to be implemented either above generic I2C or specialized SMBus operations, we support SMBus control- lers in the slave device interface too. We start with four simple slave functions: i2c_readb(), i2c_writeb(), i2c_readb_at() and i2c_writeb_at(). They are all compatible to respec- tive SMBus functions. But we keep aliases because it would be weird to force e.g. an I2C EEPROM driver to call smbus_read_byte(). Change-Id: I98386f91bf4799ba3df84ec8bc0f64edd4142818 Signed-off-by: Nico Huber <nico.huber@secunet.com> Reviewed-on: https://review.coreboot.org/20846 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Aaron Durbin <adurbin@chromium.org> Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
2017-08-01 17:09:35 +02:00
{
struct device *const busdev = i2c_busdev(dev);
if (!busdev)
return -1;
if (busdev->ops->ops_i2c_bus) {
uint8_t buf[] = { off, val };
const struct i2c_msg msg = {
.flags = 0,
.slave = dev->path.i2c.device,
.buf = buf,
.len = sizeof(buf),
};
return busdev->ops->ops_i2c_bus->transfer(busdev, &msg, 1);
} else if (busdev->ops->ops_smbus_bus->write_byte) {
return busdev->ops->ops_smbus_bus->write_byte(dev, off, val);
}
device: correct code style Revise the following aspects to follow coreboot's coding style: - Drop braces for single-statement condition and loop bodies. - Use `__func__` to print the current function's name. - Reflow pointer dereferences to fit in a single line. - Adjust the `*` position in pointer variable declarations. - Drop unnecessary `else` statements. BUG = N/A TEST = Build Compulab Intense-PC with secure oprom enabled Change-Id: I780251d946d5bea97658476d61d25555ec768dfc Signed-off-by: Frans Hendriks <fhendriks@eltan.com> Reviewed-on: https://review.coreboot.org/c/coreboot/+/49963 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Angel Pons <th3fanbus@gmail.com>
2021-02-01 11:44:37 +01:00
printk(BIOS_ERR, "%s Missing ops_smbus_bus->write_byte",
dev_path(busdev));
return -1;
Reinvent I2C ops Do not use the global platform_i2c_transfer() function that can only be implemented by a single driver. Instead, make a `struct device` aware transfer() function the only interface function for I2C controller dri- vers to implement. To not force the slave device drivers to be implemented either above generic I2C or specialized SMBus operations, we support SMBus control- lers in the slave device interface too. We start with four simple slave functions: i2c_readb(), i2c_writeb(), i2c_readb_at() and i2c_writeb_at(). They are all compatible to respec- tive SMBus functions. But we keep aliases because it would be weird to force e.g. an I2C EEPROM driver to call smbus_read_byte(). Change-Id: I98386f91bf4799ba3df84ec8bc0f64edd4142818 Signed-off-by: Nico Huber <nico.huber@secunet.com> Reviewed-on: https://review.coreboot.org/20846 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Aaron Durbin <adurbin@chromium.org> Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
2017-08-01 17:09:35 +02:00
}
device/i2c_bus: Add i2c_dev_read_at16() i2c_dev_read_at16() sends a 16-bit offset to the I2C chip (for larger EEPROM parts), then reads bytes up to a given length into a buffer. Change-Id: I7516f3e5d9aca362c2b340aa5627d91510c09412 Signed-off-by: Nico Huber <nico.huber@secunet.com> Reviewed-on: https://review.coreboot.org/c/coreboot/+/29478 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
2017-11-01 13:15:33 +01:00
device: correct code style Revise the following aspects to follow coreboot's coding style: - Drop braces for single-statement condition and loop bodies. - Use `__func__` to print the current function's name. - Reflow pointer dereferences to fit in a single line. - Adjust the `*` position in pointer variable declarations. - Drop unnecessary `else` statements. BUG = N/A TEST = Build Compulab Intense-PC with secure oprom enabled Change-Id: I780251d946d5bea97658476d61d25555ec768dfc Signed-off-by: Frans Hendriks <fhendriks@eltan.com> Reviewed-on: https://review.coreboot.org/c/coreboot/+/49963 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Angel Pons <th3fanbus@gmail.com>
2021-02-01 11:44:37 +01:00
int i2c_dev_read_at16(struct device *const dev, uint8_t *const buf, const size_t len,
uint16_t off)
device/i2c_bus: Add i2c_dev_read_at16() i2c_dev_read_at16() sends a 16-bit offset to the I2C chip (for larger EEPROM parts), then reads bytes up to a given length into a buffer. Change-Id: I7516f3e5d9aca362c2b340aa5627d91510c09412 Signed-off-by: Nico Huber <nico.huber@secunet.com> Reviewed-on: https://review.coreboot.org/c/coreboot/+/29478 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
2017-11-01 13:15:33 +01:00
{
struct device *const busdev = i2c_busdev(dev);
if (!busdev)
return -1;
if (busdev->ops->ops_i2c_bus) {
const struct i2c_msg msg[] = {
{
.flags = 0,
.slave = dev->path.i2c.device,
.buf = (uint8_t *)&off,
.len = sizeof(off),
},
{
.flags = I2C_M_RD,
.slave = dev->path.i2c.device,
.buf = buf,
.len = len,
},
};
write_be16(&off, off);
device: correct code style Revise the following aspects to follow coreboot's coding style: - Drop braces for single-statement condition and loop bodies. - Use `__func__` to print the current function's name. - Reflow pointer dereferences to fit in a single line. - Adjust the `*` position in pointer variable declarations. - Drop unnecessary `else` statements. BUG = N/A TEST = Build Compulab Intense-PC with secure oprom enabled Change-Id: I780251d946d5bea97658476d61d25555ec768dfc Signed-off-by: Frans Hendriks <fhendriks@eltan.com> Reviewed-on: https://review.coreboot.org/c/coreboot/+/49963 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Angel Pons <th3fanbus@gmail.com>
2021-02-01 11:44:37 +01:00
const int ret = busdev->ops->ops_i2c_bus->transfer(busdev, msg,
ARRAY_SIZE(msg));
device/i2c_bus: Add i2c_dev_read_at16() i2c_dev_read_at16() sends a 16-bit offset to the I2C chip (for larger EEPROM parts), then reads bytes up to a given length into a buffer. Change-Id: I7516f3e5d9aca362c2b340aa5627d91510c09412 Signed-off-by: Nico Huber <nico.huber@secunet.com> Reviewed-on: https://review.coreboot.org/c/coreboot/+/29478 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
2017-11-01 13:15:33 +01:00
if (ret)
return ret;
else
return len;
} else {
printk(BIOS_ERR, "%s Missing ops_i2c_bus->transfer", dev_path(busdev));
return -1;
}
}