[PATCH mfd v2 1/3] mfd: rsmu: support 32-bit address space
From: Min Li
Date: Mon Mar 27 2023 - 14:41:55 EST
From: Min Li <min.li.xe@xxxxxxxxxxx>
We used to assume 0x2010xxxx address. Now that we
need to access 0x2011xxxx address, we need to
support read/write the whole 32-bit address space.
Also defined RSMU_MAX_WRITE_COUNT and
RSMU_MAX_READ_COUNT for readability
Signed-off-by: Min Li <min.li.xe@xxxxxxxxxxx>
---
changelog
-change commit message to include defining RSMU_MAX_WRITE/WRITE_COUNT
drivers/mfd/rsmu.h | 2 +
drivers/mfd/rsmu_i2c.c | 172 +++++++++++++++++++++++++++++++--------
drivers/mfd/rsmu_spi.c | 52 +++++++-----
include/linux/mfd/rsmu.h | 5 +-
4 files changed, 175 insertions(+), 56 deletions(-)
diff --git a/drivers/mfd/rsmu.h b/drivers/mfd/rsmu.h
index bb88597d189f..1bb04cafa45d 100644
--- a/drivers/mfd/rsmu.h
+++ b/drivers/mfd/rsmu.h
@@ -10,6 +10,8 @@
#include <linux/mfd/rsmu.h>
+#define RSMU_CM_SCSR_BASE 0x20100000
+
int rsmu_core_init(struct rsmu_ddata *rsmu);
void rsmu_core_exit(struct rsmu_ddata *rsmu);
diff --git a/drivers/mfd/rsmu_i2c.c b/drivers/mfd/rsmu_i2c.c
index 15d25b081434..171b0544b778 100644
--- a/drivers/mfd/rsmu_i2c.c
+++ b/drivers/mfd/rsmu_i2c.c
@@ -18,11 +18,12 @@
#include "rsmu.h"
/*
- * 16-bit register address: the lower 8 bits of the register address come
- * from the offset addr byte and the upper 8 bits come from the page register.
+ * 32-bit register address: the lower 8 bits of the register address come
+ * from the offset addr byte and the upper 24 bits come from the page register.
*/
-#define RSMU_CM_PAGE_ADDR 0xFD
-#define RSMU_CM_PAGE_WINDOW 256
+#define RSMU_CM_PAGE_ADDR 0xFC
+#define RSMU_CM_PAGE_MASK 0xFFFFFF00
+#define RSMU_CM_ADDRESS_MASK 0x000000FF
/*
* 15-bit register address: the lower 7 bits of the register address come
@@ -31,18 +32,6 @@
#define RSMU_SABRE_PAGE_ADDR 0x7F
#define RSMU_SABRE_PAGE_WINDOW 128
-static const struct regmap_range_cfg rsmu_cm_range_cfg[] = {
- {
- .range_min = 0,
- .range_max = 0xD000,
- .selector_reg = RSMU_CM_PAGE_ADDR,
- .selector_mask = 0xFF,
- .selector_shift = 0,
- .window_start = 0,
- .window_len = RSMU_CM_PAGE_WINDOW,
- }
-};
-
static const struct regmap_range_cfg rsmu_sabre_range_cfg[] = {
{
.range_min = 0,
@@ -55,35 +44,142 @@ static const struct regmap_range_cfg rsmu_sabre_range_cfg[] = {
}
};
-static bool rsmu_cm_volatile_reg(struct device *dev, unsigned int reg)
+static bool rsmu_sabre_volatile_reg(struct device *dev, unsigned int reg)
{
switch (reg) {
- case RSMU_CM_PAGE_ADDR:
+ case RSMU_SABRE_PAGE_ADDR:
return false;
default:
return true;
}
}
-static bool rsmu_sabre_volatile_reg(struct device *dev, unsigned int reg)
+static int rsmu_read_device(struct rsmu_ddata *rsmu, u8 reg, u8 *buf, u16 bytes)
{
- switch (reg) {
- case RSMU_SABRE_PAGE_ADDR:
- return false;
- default:
- return true;
+ struct i2c_client *client = to_i2c_client(rsmu->dev);
+ struct i2c_msg msg[2];
+ int cnt;
+
+ msg[0].addr = client->addr;
+ msg[0].flags = 0;
+ msg[0].len = 1;
+ msg[0].buf = ®
+
+ msg[1].addr = client->addr;
+ msg[1].flags = I2C_M_RD;
+ msg[1].len = bytes;
+ msg[1].buf = buf;
+
+ cnt = i2c_transfer(client->adapter, msg, 2);
+
+ if (cnt < 0) {
+ dev_err(rsmu->dev, "i2c_transfer failed at addr: %04x!", reg);
+ return cnt;
+ } else if (cnt != 2) {
+ dev_err(rsmu->dev,
+ "i2c_transfer sent only %d of 2 messages", cnt);
+ return -EIO;
+ }
+
+ return 0;
+}
+
+static int rsmu_write_device(struct rsmu_ddata *rsmu, u8 reg, u8 *buf, u16 bytes)
+{
+ struct i2c_client *client = to_i2c_client(rsmu->dev);
+ /* we add 1 byte for device register */
+ u8 msg[RSMU_MAX_WRITE_COUNT + 1];
+ int cnt;
+
+ if (bytes > RSMU_MAX_WRITE_COUNT)
+ return -EINVAL;
+
+ msg[0] = reg;
+ memcpy(&msg[1], buf, bytes);
+
+ cnt = i2c_master_send(client, msg, bytes + 1);
+
+ if (cnt < 0) {
+ dev_err(&client->dev,
+ "i2c_master_send failed at addr: %04x!", reg);
+ return cnt;
}
+
+ return 0;
+}
+
+static int rsmu_write_page_register(struct rsmu_ddata *rsmu, u32 reg)
+{
+ u32 page = reg & RSMU_CM_PAGE_MASK;
+ u8 buf[4];
+ int err;
+
+ /* Do not modify offset register for none-scsr registers */
+ if (reg < RSMU_CM_SCSR_BASE)
+ return 0;
+
+ /* Simply return if we are on the same page */
+ if (rsmu->page == page)
+ return 0;
+
+ buf[0] = 0x0;
+ buf[1] = (u8)((page >> 8) & 0xFF);
+ buf[2] = (u8)((page >> 16) & 0xFF);
+ buf[3] = (u8)((page >> 24) & 0xFF);
+
+ err = rsmu_write_device(rsmu, RSMU_CM_PAGE_ADDR, buf, sizeof(buf));
+ if (err)
+ dev_err(rsmu->dev, "Failed to set page offset 0x%x\n", page);
+ else
+ /* Remember the last page */
+ rsmu->page = page;
+
+ return err;
+}
+
+static int rsmu_reg_read(void *context, unsigned int reg, unsigned int *val)
+{
+ struct rsmu_ddata *rsmu = i2c_get_clientdata((struct i2c_client *)context);
+ u8 addr = (u8)(reg & RSMU_CM_ADDRESS_MASK);
+ int err;
+
+ err = rsmu_write_page_register(rsmu, reg);
+ if (err)
+ return err;
+
+ err = rsmu_read_device(rsmu, addr, (u8 *)val, 1);
+ if (err)
+ dev_err(rsmu->dev, "Failed to read offset address 0x%x\n", addr);
+
+ return err;
+}
+
+static int rsmu_reg_write(void *context, unsigned int reg, unsigned int val)
+{
+ struct rsmu_ddata *rsmu = i2c_get_clientdata((struct i2c_client *)context);
+ u8 addr = (u8)(reg & RSMU_CM_ADDRESS_MASK);
+ u8 data = (u8)val;
+ int err;
+
+ err = rsmu_write_page_register(rsmu, reg);
+ if (err)
+ return err;
+
+ err = rsmu_write_device(rsmu, addr, &data, 1);
+ if (err)
+ dev_err(rsmu->dev,
+ "Failed to write offset address 0x%x\n", addr);
+
+ return err;
}
static const struct regmap_config rsmu_cm_regmap_config = {
- .reg_bits = 8,
+ .reg_bits = 32,
.val_bits = 8,
- .max_register = 0xD000,
- .ranges = rsmu_cm_range_cfg,
- .num_ranges = ARRAY_SIZE(rsmu_cm_range_cfg),
- .volatile_reg = rsmu_cm_volatile_reg,
- .cache_type = REGCACHE_RBTREE,
- .can_multi_write = true,
+ .max_register = 0x20120000,
+ .reg_read = rsmu_reg_read,
+ .reg_write = rsmu_reg_write,
+ .cache_type = REGCACHE_NONE,
};
static const struct regmap_config rsmu_sabre_regmap_config = {
@@ -101,14 +197,14 @@ static const struct regmap_config rsmu_sl_regmap_config = {
.reg_bits = 16,
.val_bits = 8,
.reg_format_endian = REGMAP_ENDIAN_BIG,
- .max_register = 0x339,
+ .max_register = 0x340,
.cache_type = REGCACHE_NONE,
.can_multi_write = true,
};
-static int rsmu_i2c_probe(struct i2c_client *client)
+static int rsmu_i2c_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
{
- const struct i2c_device_id *id = i2c_client_get_device_id(client);
const struct regmap_config *cfg;
struct rsmu_ddata *rsmu;
int ret;
@@ -136,7 +232,11 @@ static int rsmu_i2c_probe(struct i2c_client *client)
dev_err(rsmu->dev, "Unsupported RSMU device type: %d\n", rsmu->type);
return -ENODEV;
}
- rsmu->regmap = devm_regmap_init_i2c(client, cfg);
+
+ if (rsmu->type == RSMU_CM)
+ rsmu->regmap = devm_regmap_init(&client->dev, NULL, client, cfg);
+ else
+ rsmu->regmap = devm_regmap_init_i2c(client, cfg);
if (IS_ERR(rsmu->regmap)) {
ret = PTR_ERR(rsmu->regmap);
dev_err(rsmu->dev, "Failed to allocate register map: %d\n", ret);
@@ -180,7 +280,7 @@ static struct i2c_driver rsmu_i2c_driver = {
.name = "rsmu-i2c",
.of_match_table = of_match_ptr(rsmu_i2c_of_match),
},
- .probe_new = rsmu_i2c_probe,
+ .probe = rsmu_i2c_probe,
.remove = rsmu_i2c_remove,
.id_table = rsmu_i2c_id,
};
diff --git a/drivers/mfd/rsmu_spi.c b/drivers/mfd/rsmu_spi.c
index 2428aaa9aaed..a4a595bb8d0d 100644
--- a/drivers/mfd/rsmu_spi.c
+++ b/drivers/mfd/rsmu_spi.c
@@ -19,19 +19,21 @@
#define RSMU_CM_PAGE_ADDR 0x7C
#define RSMU_SABRE_PAGE_ADDR 0x7F
-#define RSMU_HIGHER_ADDR_MASK 0xFF80
-#define RSMU_HIGHER_ADDR_SHIFT 7
-#define RSMU_LOWER_ADDR_MASK 0x7F
+#define RSMU_PAGE_MASK 0xFFFFFF80
+#define RSMU_ADDR_MASK 0x7F
static int rsmu_read_device(struct rsmu_ddata *rsmu, u8 reg, u8 *buf, u16 bytes)
{
struct spi_device *client = to_spi_device(rsmu->dev);
struct spi_transfer xfer = {0};
struct spi_message msg;
- u8 cmd[256] = {0};
- u8 rsp[256] = {0};
+ u8 cmd[RSMU_MAX_READ_COUNT + 1] = {0};
+ u8 rsp[RSMU_MAX_READ_COUNT + 1] = {0};
int ret;
+ if (bytes > RSMU_MAX_READ_COUNT)
+ return -EINVAL;
+
cmd[0] = reg | 0x80;
xfer.rx_buf = rsp;
xfer.len = bytes + 1;
@@ -66,7 +68,10 @@ static int rsmu_write_device(struct rsmu_ddata *rsmu, u8 reg, u8 *buf, u16 bytes
struct spi_device *client = to_spi_device(rsmu->dev);
struct spi_transfer xfer = {0};
struct spi_message msg;
- u8 cmd[256] = {0};
+ u8 cmd[RSMU_MAX_WRITE_COUNT + 1] = {0};
+
+ if (bytes > RSMU_MAX_WRITE_COUNT)
+ return -EINVAL;
cmd[0] = reg;
memcpy(&cmd[1], buf, bytes);
@@ -86,26 +91,35 @@ static int rsmu_write_device(struct rsmu_ddata *rsmu, u8 reg, u8 *buf, u16 bytes
* 16-bit register address: the lower 7 bits of the register address come
* from the offset addr byte and the upper 9 bits come from the page register.
*/
-static int rsmu_write_page_register(struct rsmu_ddata *rsmu, u16 reg)
+static int rsmu_write_page_register(struct rsmu_ddata *rsmu, u32 reg)
{
u8 page_reg;
- u8 buf[2];
+ u8 buf[4];
u16 bytes;
- u16 page;
+ u32 page;
int err;
switch (rsmu->type) {
case RSMU_CM:
+ /* Do not modify page register for none-scsr registers */
+ if (reg < RSMU_CM_SCSR_BASE)
+ return 0;
page_reg = RSMU_CM_PAGE_ADDR;
- page = reg & RSMU_HIGHER_ADDR_MASK;
+ page = reg & RSMU_PAGE_MASK;
buf[0] = (u8)(page & 0xff);
buf[1] = (u8)((page >> 8) & 0xff);
- bytes = 2;
+ buf[2] = (u8)((page >> 16) & 0xff);
+ buf[3] = (u8)((page >> 24) & 0xff);
+ bytes = 4;
break;
case RSMU_SABRE:
+ /* Do not modify page register if reg is page register itself */
+ if ((reg & RSMU_ADDR_MASK) == RSMU_ADDR_MASK)
+ return 0;
page_reg = RSMU_SABRE_PAGE_ADDR;
- page = reg >> RSMU_HIGHER_ADDR_SHIFT;
- buf[0] = (u8)(page & 0xff);
+ page = reg & RSMU_PAGE_MASK;
+ /* The three page bits are located in the single Page Register */
+ buf[0] = (u8)((page >> 7) & 0x7);
bytes = 1;
break;
default:
@@ -129,8 +143,8 @@ static int rsmu_write_page_register(struct rsmu_ddata *rsmu, u16 reg)
static int rsmu_reg_read(void *context, unsigned int reg, unsigned int *val)
{
- struct rsmu_ddata *rsmu = spi_get_drvdata(context);
- u8 addr = (u8)(reg & RSMU_LOWER_ADDR_MASK);
+ struct rsmu_ddata *rsmu = spi_get_drvdata((struct spi_device *)context);
+ u8 addr = (u8)(reg & RSMU_ADDR_MASK);
int err;
err = rsmu_write_page_register(rsmu, reg);
@@ -146,8 +160,8 @@ static int rsmu_reg_read(void *context, unsigned int reg, unsigned int *val)
static int rsmu_reg_write(void *context, unsigned int reg, unsigned int val)
{
- struct rsmu_ddata *rsmu = spi_get_drvdata(context);
- u8 addr = (u8)(reg & RSMU_LOWER_ADDR_MASK);
+ struct rsmu_ddata *rsmu = spi_get_drvdata((struct spi_device *)context);
+ u8 addr = (u8)(reg & RSMU_ADDR_MASK);
u8 data = (u8)val;
int err;
@@ -164,9 +178,9 @@ static int rsmu_reg_write(void *context, unsigned int reg, unsigned int val)
}
static const struct regmap_config rsmu_cm_regmap_config = {
- .reg_bits = 16,
+ .reg_bits = 32,
.val_bits = 8,
- .max_register = 0xD000,
+ .max_register = 0x20120000,
.reg_read = rsmu_reg_read,
.reg_write = rsmu_reg_write,
.cache_type = REGCACHE_NONE,
diff --git a/include/linux/mfd/rsmu.h b/include/linux/mfd/rsmu.h
index 6870de608233..0379aa207428 100644
--- a/include/linux/mfd/rsmu.h
+++ b/include/linux/mfd/rsmu.h
@@ -8,6 +8,9 @@
#ifndef __LINUX_MFD_RSMU_H
#define __LINUX_MFD_RSMU_H
+#define RSMU_MAX_WRITE_COUNT (255)
+#define RSMU_MAX_READ_COUNT (255)
+
/* The supported devices are ClockMatrix, Sabre and SnowLotus */
enum rsmu_type {
RSMU_CM = 0x34000,
@@ -31,6 +34,6 @@ struct rsmu_ddata {
struct regmap *regmap;
struct mutex lock;
enum rsmu_type type;
- u16 page;
+ u32 page;
};
#endif /* __LINUX_MFD_RSMU_H */
--
2.39.2