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/*
* Qualcomm SPMI bus driver
*
* (C) Copyright 2015 Mateusz Kulikowski <mateusz.kulikowski@gmail.com>
*
* Loosely based on Little Kernel driver
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <common.h>
#include <dm.h>
#include <errno.h>
#include <fdtdec.h>
#include <asm/io.h>
#include <spmi/spmi.h>
DECLARE_GLOBAL_DATA_PTR;
#define ARB_CHANNEL_OFFSET(n) (0x4 * (n))
#define SPMI_CH_OFFSET(chnl) ((chnl) * 0x8000)
#define SPMI_REG_CMD0 0x0
#define SPMI_REG_CONFIG 0x4
#define SPMI_REG_STATUS 0x8
#define SPMI_REG_WDATA 0x10
#define SPMI_REG_RDATA 0x18
#define SPMI_CMD_OPCODE_SHIFT 27
#define SPMI_CMD_SLAVE_ID_SHIFT 20
#define SPMI_CMD_ADDR_SHIFT 12
#define SPMI_CMD_ADDR_OFFSET_SHIFT 4
#define SPMI_CMD_BYTE_CNT_SHIFT 0
#define SPMI_CMD_EXT_REG_WRITE_LONG 0x00
#define SPMI_CMD_EXT_REG_READ_LONG 0x01
#define SPMI_STATUS_DONE 0x1
#define SPMI_MAX_CHANNELS 128
#define SPMI_MAX_SLAVES 16
#define SPMI_MAX_PERIPH 256
struct msm_spmi_priv {
phys_addr_t arb_chnl; /* ARB channel mapping base */
phys_addr_t spmi_core; /* SPMI core */
phys_addr_t spmi_obs; /* SPMI observer */
/* SPMI channel map */
uint8_t channel_map[SPMI_MAX_SLAVES][SPMI_MAX_PERIPH];
};
static int msm_spmi_write(struct udevice *dev, int usid, int pid, int off,
uint8_t val)
{
struct msm_spmi_priv *priv = dev_get_priv(dev);
unsigned channel;
uint32_t reg = 0;
if (usid >= SPMI_MAX_SLAVES)
return -EIO;
if (pid >= SPMI_MAX_PERIPH)
return -EIO;
channel = priv->channel_map[usid][pid];
/* Disable IRQ mode for the current channel*/
writel(0x0, priv->spmi_core + SPMI_CH_OFFSET(channel) +
SPMI_REG_CONFIG);
/* Write single byte */
writel(val, priv->spmi_core + SPMI_CH_OFFSET(channel) + SPMI_REG_WDATA);
/* Prepare write command */
reg |= SPMI_CMD_EXT_REG_WRITE_LONG << SPMI_CMD_OPCODE_SHIFT;
reg |= (usid << SPMI_CMD_SLAVE_ID_SHIFT);
reg |= (pid << SPMI_CMD_ADDR_SHIFT);
reg |= (off << SPMI_CMD_ADDR_OFFSET_SHIFT);
reg |= 1; /* byte count */
/* Send write command */
writel(reg, priv->spmi_core + SPMI_CH_OFFSET(channel) + SPMI_REG_CMD0);
/* Wait till CMD DONE status */
reg = 0;
while (!reg) {
reg = readl(priv->spmi_core + SPMI_CH_OFFSET(channel) +
SPMI_REG_STATUS);
}
if (reg ^ SPMI_STATUS_DONE) {
printf("SPMI write failure.\n");
return -EIO;
}
return 0;
}
static int msm_spmi_read(struct udevice *dev, int usid, int pid, int off)
{
struct msm_spmi_priv *priv = dev_get_priv(dev);
unsigned channel;
uint32_t reg = 0;
if (usid >= SPMI_MAX_SLAVES)
return -EIO;
if (pid >= SPMI_MAX_PERIPH)
return -EIO;
channel = priv->channel_map[usid][pid];
/* Disable IRQ mode for the current channel*/
writel(0x0, priv->spmi_obs + SPMI_CH_OFFSET(channel) + SPMI_REG_CONFIG);
/* Prepare read command */
reg |= SPMI_CMD_EXT_REG_READ_LONG << SPMI_CMD_OPCODE_SHIFT;
reg |= (usid << SPMI_CMD_SLAVE_ID_SHIFT);
reg |= (pid << SPMI_CMD_ADDR_SHIFT);
reg |= (off << SPMI_CMD_ADDR_OFFSET_SHIFT);
reg |= 1; /* byte count */
/* Request read */
writel(reg, priv->spmi_obs + SPMI_CH_OFFSET(channel) + SPMI_REG_CMD0);
/* Wait till CMD DONE status */
reg = 0;
while (!reg) {
reg = readl(priv->spmi_obs + SPMI_CH_OFFSET(channel) +
SPMI_REG_STATUS);
}
if (reg ^ SPMI_STATUS_DONE) {
printf("SPMI read failure.\n");
return -EIO;
}
/* Read the data */
return readl(priv->spmi_obs + SPMI_CH_OFFSET(channel) +
SPMI_REG_RDATA) & 0xFF;
}
static struct dm_spmi_ops msm_spmi_ops = {
.read = msm_spmi_read,
.write = msm_spmi_write,
};
static int msm_spmi_probe(struct udevice *dev)
{
struct udevice *parent = dev->parent;
struct msm_spmi_priv *priv = dev_get_priv(dev);
int i;
priv->arb_chnl = dev_get_addr(dev);
priv->spmi_core = fdtdec_get_addr_size_auto_parent(gd->fdt_blob,
parent->of_offset,
dev->of_offset,
"reg", 1, NULL);
priv->spmi_obs = fdtdec_get_addr_size_auto_parent(gd->fdt_blob,
parent->of_offset,
dev->of_offset, "reg",
2, NULL);
if (priv->arb_chnl == FDT_ADDR_T_NONE ||
priv->spmi_core == FDT_ADDR_T_NONE ||
priv->spmi_obs == FDT_ADDR_T_NONE)
return -EINVAL;
/* Scan peripherals connected to each SPMI channel */
for (i = 0; i < SPMI_MAX_CHANNELS ; i++) {
uint32_t periph = readl(priv->arb_chnl + ARB_CHANNEL_OFFSET(i));
uint8_t slave_id = (periph & 0xf0000) >> 16;
uint8_t pid = (periph & 0xff00) >> 8;
priv->channel_map[slave_id][pid] = i;
}
return 0;
}
static const struct udevice_id msm_spmi_ids[] = {
{ .compatible = "qcom,spmi-pmic-arb" },
{ }
};
U_BOOT_DRIVER(msm_spmi) = {
.name = "msm_spmi",
.id = UCLASS_SPMI,
.of_match = msm_spmi_ids,
.ops = &msm_spmi_ops,
.probe = msm_spmi_probe,
.priv_auto_alloc_size = sizeof(struct msm_spmi_priv),
};
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