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// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2014 Hans de Goede <hdegoede@redhat.com>
*
* Based on allwinner u-boot sources rsb code which is:
* (C) Copyright 2007-2013
* Allwinner Technology Co., Ltd. <www.allwinnertech.com>
* lixiang <lixiang@allwinnertech.com>
*/
#include <axp_pmic.h>
#include <common.h>
#include <dm.h>
#include <errno.h>
#include <i2c.h>
#include <time.h>
#include <asm/arch/cpu.h>
#include <asm/arch/gpio.h>
#include <asm/arch/prcm.h>
#include <asm/arch/rsb.h>
static int sun8i_rsb_await_trans(struct sunxi_rsb_reg *base)
{
unsigned long tmo = timer_get_us() + 1000000;
u32 stat;
int ret;
while (1) {
stat = readl(&base->stat);
if (stat & RSB_STAT_LBSY_INT) {
ret = -EBUSY;
break;
}
if (stat & RSB_STAT_TERR_INT) {
ret = -EIO;
break;
}
if (stat & RSB_STAT_TOVER_INT) {
ret = 0;
break;
}
if (timer_get_us() > tmo) {
ret = -ETIME;
break;
}
}
writel(stat, &base->stat); /* Clear status bits */
return ret;
}
static int sun8i_rsb_do_trans(struct sunxi_rsb_reg *base)
{
setbits_le32(&base->ctrl, RSB_CTRL_START_TRANS);
return sun8i_rsb_await_trans(base);
}
static int sun8i_rsb_read(struct sunxi_rsb_reg *base, u16 runtime_addr,
u8 reg_addr, u8 *data)
{
int ret;
writel(RSB_DEVADDR_RUNTIME_ADDR(runtime_addr), &base->devaddr);
writel(reg_addr, &base->addr);
writel(RSB_CMD_BYTE_READ, &base->cmd);
ret = sun8i_rsb_do_trans(base);
if (ret)
return ret;
*data = readl(&base->data) & 0xff;
return 0;
}
static int sun8i_rsb_write(struct sunxi_rsb_reg *base, u16 runtime_addr,
u8 reg_addr, u8 data)
{
writel(RSB_DEVADDR_RUNTIME_ADDR(runtime_addr), &base->devaddr);
writel(reg_addr, &base->addr);
writel(data, &base->data);
writel(RSB_CMD_BYTE_WRITE, &base->cmd);
return sun8i_rsb_do_trans(base);
}
static int sun8i_rsb_set_device_address(struct sunxi_rsb_reg *base,
u16 device_addr, u16 runtime_addr)
{
writel(RSB_DEVADDR_RUNTIME_ADDR(runtime_addr) |
RSB_DEVADDR_DEVICE_ADDR(device_addr), &base->devaddr);
writel(RSB_CMD_SET_RTSADDR, &base->cmd);
return sun8i_rsb_do_trans(base);
}
static void sun8i_rsb_cfg_io(void)
{
#ifdef CONFIG_MACH_SUN8I
sunxi_gpio_set_cfgpin(SUNXI_GPL(0), SUN8I_GPL_R_RSB);
sunxi_gpio_set_cfgpin(SUNXI_GPL(1), SUN8I_GPL_R_RSB);
sunxi_gpio_set_pull(SUNXI_GPL(0), 1);
sunxi_gpio_set_pull(SUNXI_GPL(1), 1);
sunxi_gpio_set_drv(SUNXI_GPL(0), 2);
sunxi_gpio_set_drv(SUNXI_GPL(1), 2);
#elif defined CONFIG_MACH_SUN9I
sunxi_gpio_set_cfgpin(SUNXI_GPN(0), SUN9I_GPN_R_RSB);
sunxi_gpio_set_cfgpin(SUNXI_GPN(1), SUN9I_GPN_R_RSB);
sunxi_gpio_set_pull(SUNXI_GPN(0), 1);
sunxi_gpio_set_pull(SUNXI_GPN(1), 1);
sunxi_gpio_set_drv(SUNXI_GPN(0), 2);
sunxi_gpio_set_drv(SUNXI_GPN(1), 2);
#else
#error unsupported MACH_SUNXI
#endif
}
static void sun8i_rsb_set_clk(struct sunxi_rsb_reg *base)
{
u32 div = 0;
u32 cd_odly = 0;
/* Source is Hosc24M, set RSB clk to 3Mhz */
div = 24000000 / 3000000 / 2 - 1;
cd_odly = div >> 1;
if (!cd_odly)
cd_odly = 1;
writel((cd_odly << 8) | div, &base->ccr);
}
static int sun8i_rsb_set_device_mode(struct sunxi_rsb_reg *base)
{
unsigned long tmo = timer_get_us() + 1000000;
writel(RSB_DMCR_DEVICE_MODE_START | RSB_DMCR_DEVICE_MODE_DATA,
&base->dmcr);
while (readl(&base->dmcr) & RSB_DMCR_DEVICE_MODE_START) {
if (timer_get_us() > tmo)
return -ETIME;
}
return sun8i_rsb_await_trans(base);
}
static int sun8i_rsb_init(struct sunxi_rsb_reg *base)
{
/* Enable RSB and PIO clk, and de-assert their resets */
prcm_apb0_enable(PRCM_APB0_GATE_PIO | PRCM_APB0_GATE_RSB);
/* Setup external pins */
sun8i_rsb_cfg_io();
writel(RSB_CTRL_SOFT_RST, &base->ctrl);
sun8i_rsb_set_clk(base);
return sun8i_rsb_set_device_mode(base);
}
#if IS_ENABLED(CONFIG_AXP_PMIC_BUS)
int rsb_read(const u16 runtime_addr, const u8 reg_addr, u8 *data)
{
struct sunxi_rsb_reg *base = (struct sunxi_rsb_reg *)SUNXI_RSB_BASE;
return sun8i_rsb_read(base, runtime_addr, reg_addr, data);
}
int rsb_write(const u16 runtime_addr, const u8 reg_addr, u8 data)
{
struct sunxi_rsb_reg *base = (struct sunxi_rsb_reg *)SUNXI_RSB_BASE;
return sun8i_rsb_write(base, runtime_addr, reg_addr, data);
}
int rsb_set_device_address(u16 device_addr, u16 runtime_addr)
{
struct sunxi_rsb_reg *base = (struct sunxi_rsb_reg *)SUNXI_RSB_BASE;
return sun8i_rsb_set_device_address(base, device_addr, runtime_addr);
}
int rsb_init(void)
{
struct sunxi_rsb_reg *base = (struct sunxi_rsb_reg *)SUNXI_RSB_BASE;
return sun8i_rsb_init(base);
}
#endif
#if CONFIG_IS_ENABLED(DM_I2C)
struct sun8i_rsb_priv {
struct sunxi_rsb_reg *base;
};
/*
* The mapping from hardware address to runtime address is fixed, and shared
* among all RSB drivers. See the comment in drivers/bus/sunxi-rsb.c in Linux.
*/
static int sun8i_rsb_get_runtime_address(u16 device_addr)
{
if (device_addr == AXP_PMIC_PRI_DEVICE_ADDR)
return AXP_PMIC_PRI_RUNTIME_ADDR;
if (device_addr == AXP_PMIC_SEC_DEVICE_ADDR)
return AXP_PMIC_SEC_RUNTIME_ADDR;
return -ENXIO;
}
static int sun8i_rsb_xfer(struct udevice *bus, struct i2c_msg *msg, int nmsgs)
{
int runtime_addr = sun8i_rsb_get_runtime_address(msg->addr);
struct sun8i_rsb_priv *priv = dev_get_priv(bus);
if (runtime_addr < 0)
return runtime_addr;
/* The hardware only supports SMBus-style transfers. */
if (nmsgs == 2 && msg[1].flags == I2C_M_RD && msg[1].len == 1)
return sun8i_rsb_read(priv->base, runtime_addr,
msg[0].buf[0], &msg[1].buf[0]);
if (nmsgs == 1 && msg[0].len == 2)
return sun8i_rsb_write(priv->base, runtime_addr,
msg[0].buf[0], msg[0].buf[1]);
return -EINVAL;
}
static int sun8i_rsb_probe_chip(struct udevice *bus, uint chip_addr,
uint chip_flags)
{
int runtime_addr = sun8i_rsb_get_runtime_address(chip_addr);
struct sun8i_rsb_priv *priv = dev_get_priv(bus);
if (runtime_addr < 0)
return runtime_addr;
return sun8i_rsb_set_device_address(priv->base, chip_addr, runtime_addr);
}
static int sun8i_rsb_probe(struct udevice *bus)
{
struct sun8i_rsb_priv *priv = dev_get_priv(bus);
priv->base = dev_read_addr_ptr(bus);
return sun8i_rsb_init(priv->base);
}
static int sun8i_rsb_child_pre_probe(struct udevice *child)
{
struct dm_i2c_chip *chip = dev_get_parent_plat(child);
/* Ensure each transfer is for a single register. */
chip->flags |= DM_I2C_CHIP_RD_ADDRESS | DM_I2C_CHIP_WR_ADDRESS;
return 0;
}
static const struct dm_i2c_ops sun8i_rsb_ops = {
.xfer = sun8i_rsb_xfer,
.probe_chip = sun8i_rsb_probe_chip,
};
static const struct udevice_id sun8i_rsb_ids[] = {
{ .compatible = "allwinner,sun8i-a23-rsb" },
{ /* sentinel */ }
};
U_BOOT_DRIVER(sun8i_rsb) = {
.name = "sun8i_rsb",
.id = UCLASS_I2C,
.of_match = sun8i_rsb_ids,
.probe = sun8i_rsb_probe,
.child_pre_probe = sun8i_rsb_child_pre_probe,
.priv_auto = sizeof(struct sun8i_rsb_priv),
.ops = &sun8i_rsb_ops,
};
#endif /* CONFIG_IS_ENABLED(DM_I2C) */
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