mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-11 22:03:15 +00:00
e160f7d430
At present devices use a simple integer offset to record the device tree node associated with the device. In preparation for supporting a live device tree, which uses a node pointer instead, refactor existing code to access this field through an inline function. Signed-off-by: Simon Glass <sjg@chromium.org>
142 lines
3.3 KiB
C
142 lines
3.3 KiB
C
/*
|
|
* Copyright (C) 2015 Samsung Electronics
|
|
* Przemyslaw Marczak <p.marczak@samsung.com>
|
|
*
|
|
* SPDX-License-Identifier: GPL-2.0+
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <fdtdec.h>
|
|
#include <errno.h>
|
|
#include <dm.h>
|
|
#include <i2c.h>
|
|
#include <power/pmic.h>
|
|
#include <power/sandbox_pmic.h>
|
|
|
|
DECLARE_GLOBAL_DATA_PTR;
|
|
|
|
/**
|
|
* struct sandbox_i2c_pmic_plat_data - platform data for the PMIC
|
|
*
|
|
* @rw_reg: PMICs register of the chip I/O transaction
|
|
* @reg: PMICs registers array
|
|
*/
|
|
struct sandbox_i2c_pmic_plat_data {
|
|
u8 rw_reg;
|
|
u8 reg[SANDBOX_PMIC_REG_COUNT];
|
|
};
|
|
|
|
static int sandbox_i2c_pmic_read_data(struct udevice *emul, uchar chip,
|
|
uchar *buffer, int len)
|
|
{
|
|
struct sandbox_i2c_pmic_plat_data *plat = dev_get_platdata(emul);
|
|
|
|
if (plat->rw_reg + len > SANDBOX_PMIC_REG_COUNT) {
|
|
error("Request exceeds PMIC register range! Max register: %#x",
|
|
SANDBOX_PMIC_REG_COUNT);
|
|
return -EFAULT;
|
|
}
|
|
|
|
debug("Read PMIC: %#x at register: %#x count: %d\n",
|
|
(unsigned)chip & 0xff, plat->rw_reg, len);
|
|
|
|
memcpy(buffer, &plat->reg[plat->rw_reg], len);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int sandbox_i2c_pmic_write_data(struct udevice *emul, uchar chip,
|
|
uchar *buffer, int len,
|
|
bool next_is_read)
|
|
{
|
|
struct sandbox_i2c_pmic_plat_data *plat = dev_get_platdata(emul);
|
|
|
|
/* Probe only */
|
|
if (!len)
|
|
return 0;
|
|
|
|
/* Set PMIC register for I/O */
|
|
plat->rw_reg = *buffer;
|
|
|
|
debug("Write PMIC: %#x at register: %#x count: %d\n",
|
|
(unsigned)chip & 0xff, plat->rw_reg, len);
|
|
|
|
/* For read operation, set (write) only chip reg */
|
|
if (next_is_read)
|
|
return 0;
|
|
|
|
buffer++;
|
|
len--;
|
|
|
|
if (plat->rw_reg + len > SANDBOX_PMIC_REG_COUNT) {
|
|
error("Request exceeds PMIC register range! Max register: %#x",
|
|
SANDBOX_PMIC_REG_COUNT);
|
|
}
|
|
|
|
memcpy(&plat->reg[plat->rw_reg], buffer, len);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int sandbox_i2c_pmic_xfer(struct udevice *emul, struct i2c_msg *msg,
|
|
int nmsgs)
|
|
{
|
|
int ret = 0;
|
|
|
|
for (; nmsgs > 0; nmsgs--, msg++) {
|
|
bool next_is_read = nmsgs > 1 && (msg[1].flags & I2C_M_RD);
|
|
if (msg->flags & I2C_M_RD) {
|
|
ret = sandbox_i2c_pmic_read_data(emul, msg->addr,
|
|
msg->buf, msg->len);
|
|
} else {
|
|
ret = sandbox_i2c_pmic_write_data(emul, msg->addr,
|
|
msg->buf, msg->len,
|
|
next_is_read);
|
|
}
|
|
|
|
if (ret)
|
|
break;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int sandbox_i2c_pmic_ofdata_to_platdata(struct udevice *emul)
|
|
{
|
|
struct sandbox_i2c_pmic_plat_data *plat = dev_get_platdata(emul);
|
|
const u8 *reg_defaults;
|
|
|
|
debug("%s:%d Setting PMIC default registers\n", __func__, __LINE__);
|
|
|
|
reg_defaults = fdtdec_locate_byte_array(gd->fdt_blob,
|
|
dev_of_offset(emul), "reg-defaults",
|
|
SANDBOX_PMIC_REG_COUNT);
|
|
|
|
if (!reg_defaults) {
|
|
error("Property \"reg-defaults\" not found for device: %s!",
|
|
emul->name);
|
|
return -EINVAL;
|
|
}
|
|
|
|
memcpy(&plat->reg, reg_defaults, SANDBOX_PMIC_REG_COUNT);
|
|
|
|
return 0;
|
|
}
|
|
|
|
struct dm_i2c_ops sandbox_i2c_pmic_emul_ops = {
|
|
.xfer = sandbox_i2c_pmic_xfer,
|
|
};
|
|
|
|
static const struct udevice_id sandbox_i2c_pmic_ids[] = {
|
|
{ .compatible = "sandbox,i2c-pmic" },
|
|
{ }
|
|
};
|
|
|
|
U_BOOT_DRIVER(sandbox_i2c_pmic_emul) = {
|
|
.name = "sandbox_i2c_pmic_emul",
|
|
.id = UCLASS_I2C_EMUL,
|
|
.of_match = sandbox_i2c_pmic_ids,
|
|
.ofdata_to_platdata = sandbox_i2c_pmic_ofdata_to_platdata,
|
|
.platdata_auto_alloc_size = sizeof(struct sandbox_i2c_pmic_plat_data),
|
|
.ops = &sandbox_i2c_pmic_emul_ops,
|
|
};
|