From 67d6c76fc815cddc77de9529221f9ff8dd1fb10e Mon Sep 17 00:00:00 2001 From: Min Li Date: Mon, 27 Mar 2023 14:39:53 -0400 Subject: [PATCH] mfd: rsmu: Support 32-bit address space 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 Signed-off-by: Lee Jones Link: https://lore.kernel.org/r/MW5PR03MB693295AF31ABCAF6AE52EE74A08B9@MW5PR03MB6932.namprd03.prod.outlook.com --- drivers/mfd/rsmu.h | 2 + drivers/mfd/rsmu_i2c.c | 171 +++++++++++++++++++++++++++++++++++++---------- drivers/mfd/rsmu_spi.c | 52 ++++++++------ include/linux/mfd/rsmu.h | 5 +- 4 files changed, 174 insertions(+), 56 deletions(-) diff --git a/drivers/mfd/rsmu.h b/drivers/mfd/rsmu.h index bb88597..1bb04ca 100644 --- a/drivers/mfd/rsmu.h +++ b/drivers/mfd/rsmu.h @@ -10,6 +10,8 @@ #include +#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 15d25b0..221023f 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 +44,141 @@ 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); + u8 msg[RSMU_MAX_WRITE_COUNT + 1]; /* 1 Byte added for the device register */ + 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 +196,14 @@ 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 +231,11 @@ 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 +279,7 @@ 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 2428aaa..a4a595b 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 6870de6..0379aa2 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 */ -- 2.7.4