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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2019 Stephan Gerhold
*
* Adapted from old U-Boot and Linux kernel implementation:
* Copyright (C) STMicroelectronics 2009
* Copyright (C) ST-Ericsson SA 2010
*/
#include <common.h>
#include <dm.h>
#include <regmap.h>
#include <syscon.h>
#include <linux/bitops.h>
#include <linux/err.h>
#include <power/ab8500.h>
#include <power/pmic.h>
/* CPU mailbox registers */
#define PRCM_MBOX_CPU_VAL 0x0fc
#define PRCM_MBOX_CPU_SET 0x100
#define PRCM_MBOX_CPU_CLR 0x104
#define PRCM_ARM_IT1_CLR 0x48C
#define PRCM_ARM_IT1_VAL 0x494
#define PRCM_TCDM_RANGE 2
#define PRCM_REQ_MB5 0xE44
#define PRCM_ACK_MB5 0xDF4
#define _PRCM_MBOX_HEADER 0xFE8
#define PRCM_MBOX_HEADER_REQ_MB5 (_PRCM_MBOX_HEADER + 0x5)
#define PRCMU_I2C_MBOX_BIT BIT(5)
/* Mailbox 5 Requests */
#define PRCM_REQ_MB5_I2C_SLAVE_OP (PRCM_REQ_MB5 + 0x0)
#define PRCM_REQ_MB5_I2C_HW_BITS (PRCM_REQ_MB5 + 0x1)
#define PRCM_REQ_MB5_I2C_REG (PRCM_REQ_MB5 + 0x2)
#define PRCM_REQ_MB5_I2C_VAL (PRCM_REQ_MB5 + 0x3)
#define PRCMU_I2C(bank) (((bank) << 1) | BIT(6))
#define PRCMU_I2C_WRITE 0
#define PRCMU_I2C_READ 1
#define PRCMU_I2C_STOP_EN BIT(3)
/* Mailbox 5 ACKs */
#define PRCM_ACK_MB5_I2C_STATUS (PRCM_ACK_MB5 + 0x1)
#define PRCM_ACK_MB5_I2C_VAL (PRCM_ACK_MB5 + 0x3)
#define PRCMU_I2C_WR_OK 0x1
#define PRCMU_I2C_RD_OK 0x2
/* AB8500 version registers */
#define AB8500_MISC_REV_REG AB8500_MISC(0x80)
#define AB8500_MISC_IC_NAME_REG AB8500_MISC(0x82)
struct ab8500_priv {
struct ab8500 ab8500;
struct regmap *regmap;
};
static inline int prcmu_tcdm_readb(struct regmap *map, uint offset, u8 *valp)
{
return regmap_raw_read_range(map, PRCM_TCDM_RANGE, offset,
valp, sizeof(*valp));
}
static inline int prcmu_tcdm_writeb(struct regmap *map, uint offset, u8 val)
{
return regmap_raw_write_range(map, PRCM_TCDM_RANGE, offset,
&val, sizeof(val));
}
static int prcmu_wait_i2c_mbx_ready(struct ab8500_priv *priv)
{
uint val;
int ret;
ret = regmap_read(priv->regmap, PRCM_ARM_IT1_VAL, &val);
if (ret)
return ret;
if (val & PRCMU_I2C_MBOX_BIT) {
printf("ab8500: warning: PRCMU i2c mailbox was not acked\n");
/* clear mailbox 5 ack irq */
ret = regmap_write(priv->regmap, PRCM_ARM_IT1_CLR,
PRCMU_I2C_MBOX_BIT);
if (ret)
return ret;
}
/* wait for on-going transaction, use 1s timeout */
return regmap_read_poll_timeout(priv->regmap, PRCM_MBOX_CPU_VAL, val,
!(val & PRCMU_I2C_MBOX_BIT), 0, 1000);
}
static int prcmu_wait_i2c_mbx_done(struct ab8500_priv *priv)
{
uint val;
int ret;
/* set interrupt to XP70 */
ret = regmap_write(priv->regmap, PRCM_MBOX_CPU_SET, PRCMU_I2C_MBOX_BIT);
if (ret)
return ret;
/* wait for mailbox 5 (i2c) ack, use 1s timeout */
return regmap_read_poll_timeout(priv->regmap, PRCM_ARM_IT1_VAL, val,
(val & PRCMU_I2C_MBOX_BIT), 0, 1000);
}
static int ab8500_transfer(struct udevice *dev, uint bank_reg, u8 *val,
u8 op, u8 expected_status)
{
struct ab8500_priv *priv = dev_get_priv(dev);
u8 reg = bank_reg & 0xff;
u8 bank = bank_reg >> 8;
u8 status;
int ret;
ret = prcmu_wait_i2c_mbx_ready(priv);
if (ret)
return ret;
ret = prcmu_tcdm_writeb(priv->regmap, PRCM_MBOX_HEADER_REQ_MB5, 0);
if (ret)
return ret;
ret = prcmu_tcdm_writeb(priv->regmap, PRCM_REQ_MB5_I2C_SLAVE_OP,
PRCMU_I2C(bank) | op);
if (ret)
return ret;
ret = prcmu_tcdm_writeb(priv->regmap, PRCM_REQ_MB5_I2C_HW_BITS,
PRCMU_I2C_STOP_EN);
if (ret)
return ret;
ret = prcmu_tcdm_writeb(priv->regmap, PRCM_REQ_MB5_I2C_REG, reg);
if (ret)
return ret;
ret = prcmu_tcdm_writeb(priv->regmap, PRCM_REQ_MB5_I2C_VAL, *val);
if (ret)
return ret;
ret = prcmu_wait_i2c_mbx_done(priv);
if (ret) {
printf("%s: mailbox request timed out\n", __func__);
return ret;
}
/* read transfer result */
ret = prcmu_tcdm_readb(priv->regmap, PRCM_ACK_MB5_I2C_STATUS, &status);
if (ret)
return ret;
ret = prcmu_tcdm_readb(priv->regmap, PRCM_ACK_MB5_I2C_VAL, val);
if (ret)
return ret;
/*
* Clear mailbox 5 ack irq. Note that the transfer is already complete
* here so checking for errors does not make sense. Clearing the irq
* will be retried in prcmu_wait_i2c_mbx_ready() on the next transfer.
*/
regmap_write(priv->regmap, PRCM_ARM_IT1_CLR, PRCMU_I2C_MBOX_BIT);
if (status != expected_status) {
/*
* AB8500 does not have the AB8500_MISC_IC_NAME_REG register,
* but we need to try reading it to detect AB8505.
* In case of an error, assume that we have AB8500.
*/
if (op == PRCMU_I2C_READ && bank_reg == AB8500_MISC_IC_NAME_REG) {
*val = AB8500_VERSION_AB8500;
return 0;
}
printf("%s: return status %d\n", __func__, status);
return -EIO;
}
return 0;
}
static int ab8500_reg_count(struct udevice *dev)
{
return AB8500_NUM_REGISTERS;
}
static int ab8500_read(struct udevice *dev, uint reg, uint8_t *buf, int len)
{
int ret;
if (len != 1)
return -EINVAL;
*buf = 0;
ret = ab8500_transfer(dev, reg, buf, PRCMU_I2C_READ, PRCMU_I2C_RD_OK);
if (ret) {
printf("%s failed: %d\n", __func__, ret);
return ret;
}
return 0;
}
static int ab8500_write(struct udevice *dev, uint reg, const uint8_t *buf, int len)
{
int ret;
u8 val;
if (len != 1)
return -EINVAL;
val = *buf;
ret = ab8500_transfer(dev, reg, &val, PRCMU_I2C_WRITE, PRCMU_I2C_WR_OK);
if (ret) {
printf("%s failed: %d\n", __func__, ret);
return ret;
}
return 0;
}
static struct dm_pmic_ops ab8500_ops = {
.reg_count = ab8500_reg_count,
.read = ab8500_read,
.write = ab8500_write,
};
static int ab8500_probe(struct udevice *dev)
{
struct ab8500_priv *priv = dev_get_priv(dev);
int ret;
/* get regmap from the PRCMU parent device (syscon in U-Boot) */
priv->regmap = syscon_get_regmap(dev->parent);
if (IS_ERR(priv->regmap))
return PTR_ERR(priv->regmap);
ret = pmic_reg_read(dev, AB8500_MISC_IC_NAME_REG);
if (ret < 0) {
printf("ab8500: failed to read chip version: %d\n", ret);
return ret;
}
priv->ab8500.version = ret;
ret = pmic_reg_read(dev, AB8500_MISC_REV_REG);
if (ret < 0) {
printf("ab8500: failed to read chip id: %d\n", ret);
return ret;
}
priv->ab8500.chip_id = ret;
debug("ab8500: version: %#x, chip id: %#x\n",
priv->ab8500.version, priv->ab8500.chip_id);
return 0;
}
static const struct udevice_id ab8500_ids[] = {
{ .compatible = "stericsson,ab8500" },
{ }
};
U_BOOT_DRIVER(pmic_ab8500) = {
.name = "pmic_ab8500",
.id = UCLASS_PMIC,
.of_match = ab8500_ids,
.bind = dm_scan_fdt_dev,
.probe = ab8500_probe,
.ops = &ab8500_ops,
.priv_auto = sizeof(struct ab8500_priv),
};
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