@@ -12978,6 +12978,7 @@ F: drivers/input/touchscreen/melfas_mip4.c
MELLANOX BLUEFIELD I2C DRIVER
M: Khalil Blaiech <kblaiech@nvidia.com>
+M: Asmaa Mnebhi <asmaa@nvidia.com>
L: linux-i2c@vger.kernel.org
S: Supported
F: Documentation/devicetree/bindings/i2c/mellanox,i2c-mlxbf.yaml
@@ -32,8 +32,6 @@
(MLXBF_I2C_FUNC_SMBUS_DEFAULT | MLXBF_I2C_FUNC_SMBUS_BLOCK | \
I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SLAVE)
-#define MLXBF_I2C_SMBUS_MAX 3
-
/* Shared resources info in BlueField platforms. */
#define MLXBF_I2C_COALESCE_TYU_ADDR 0x02801300
@@ -48,6 +46,9 @@
#define MLXBF_I2C_COREPLL_YU_ADDR 0x02800c30
#define MLXBF_I2C_COREPLL_YU_SIZE 0x00c
+#define MLXBF_I2C_COREPLL_RSH_YU_ADDR 0x13409824
+#define MLXBF_I2C_COREPLL_RSH_YU_SIZE 0x00c
+
#define MLXBF_I2C_SHARED_RES_MAX 3
/*
@@ -131,14 +132,10 @@
/* Slave busy bit reset. */
#define MLXBF_I2C_CAUSE_S_GW_BUSY_FALL BIT(18)
-#define MLXBF_I2C_CAUSE_SLAVE_ARBITER_BITS_MASK GENMASK(20, 0)
-
/* Cause coalesce registers. */
#define MLXBF_I2C_CAUSE_COALESCE_0 0x00
-#define MLXBF_I2C_CAUSE_COALESCE_1 0x04
-#define MLXBF_I2C_CAUSE_COALESCE_2 0x08
-#define MLXBF_I2C_CAUSE_TYU_SLAVE_BIT MLXBF_I2C_SMBUS_MAX
+#define MLXBF_I2C_CAUSE_TYU_SLAVE_BIT 3
#define MLXBF_I2C_CAUSE_YU_SLAVE_BIT 1
/* Functional enable register. */
@@ -165,15 +162,6 @@
#define MLXBF_I2C_GPIO_SMBUS_GW_ASSERT_PINS(num, val) \
((val) | (0x3 << MLXBF_I2C_GPIO_SMBUS_GW_PINS(num)))
-/* SMBus timing parameters. */
-#define MLXBF_I2C_SMBUS_TIMER_SCL_LOW_SCL_HIGH 0x00
-#define MLXBF_I2C_SMBUS_TIMER_FALL_RISE_SPIKE 0x04
-#define MLXBF_I2C_SMBUS_TIMER_THOLD 0x08
-#define MLXBF_I2C_SMBUS_TIMER_TSETUP_START_STOP 0x0c
-#define MLXBF_I2C_SMBUS_TIMER_TSETUP_DATA 0x10
-#define MLXBF_I2C_SMBUS_THIGH_MAX_TBUF 0x14
-#define MLXBF_I2C_SMBUS_SCL_LOW_TIMEOUT 0x18
-
/*
* Defines SMBus operating frequency and core clock frequency.
* According to ADB files, default values are compliant to 100KHz SMBus
@@ -192,26 +180,37 @@
#define MLXBF_I2C_COREPLL_CORE_OD_YU_MASK GENMASK(3, 0)
#define MLXBF_I2C_COREPLL_CORE_R_YU_MASK GENMASK(31, 26)
+/* SMBus timing parameters. */
+#define MLXBF_I2C_SMBUS_TIMER_SCL_LOW_SCL_HIGH 0x00
+#define MLXBF_I2C_SMBUS_TIMER_FALL_RISE_SPIKE 0x04
+#define MLXBF_I2C_SMBUS_TIMER_THOLD 0x08
+#define MLXBF_I2C_SMBUS_TIMER_TSETUP_START_STOP 0x0c
+#define MLXBF_I2C_SMBUS_TIMER_TSETUP_DATA 0x10
+#define MLXBF_I2C_SMBUS_THIGH_MAX_TBUF 0x14
+#define MLXBF_I2C_SMBUS_SCL_LOW_TIMEOUT 0x18
-/* Core PLL frequency. */
-static u64 mlxbf_i2c_corepll_frequency;
+#define MLXBF_I2C_SHIFT_0 0
+#define MLXBF_I2C_SHIFT_8 8
+#define MLXBF_I2C_SHIFT_16 16
+#define MLXBF_I2C_SHIFT_24 24
+
+#define MLXBF_I2C_MASK_8 GENMASK(7, 0)
+#define MLXBF_I2C_MASK_16 GENMASK(15, 0)
+
+#define MLXBF_I2C_MST_ADDR_OFFSET 0x200
/* SMBus Master GW. */
-#define MLXBF_I2C_SMBUS_MASTER_GW 0x200
+#define MLXBF_I2C_SMBUS_MASTER_GW 0x0
/* Number of bytes received and sent. */
-#define MLXBF_I2C_SMBUS_RS_BYTES 0x300
+#define MLXBF_I2C_YU_SMBUS_RS_BYTES 0x100
+#define MLXBF_I2C_RSH_YU_SMBUS_RS_BYTES 0x10c
/* Packet error check (PEC) value. */
-#define MLXBF_I2C_SMBUS_MASTER_PEC 0x304
+#define MLXBF_I2C_SMBUS_MASTER_PEC 0x104
/* Status bits (ACK/NACK/FW Timeout). */
-#define MLXBF_I2C_SMBUS_MASTER_STATUS 0x308
+#define MLXBF_I2C_SMBUS_MASTER_STATUS 0x108
/* SMbus Master Finite State Machine. */
-#define MLXBF_I2C_SMBUS_MASTER_FSM 0x310
-
-/*
- * When enabled, the master will issue a stop condition in case of
- * timeout while waiting for FW response.
- */
-#define MLXBF_I2C_SMBUS_EN_FW_TIMEOUT 0x31c
+#define MLXBF_I2C_YU_SMBUS_MASTER_FSM 0x110
+#define MLXBF_I2C_RSH_YU_SMBUS_MASTER_FSM 0x100
/* SMBus master GW control bits offset in MLXBF_I2C_SMBUS_MASTER_GW[31:3]. */
#define MLXBF_I2C_MASTER_LOCK_BIT BIT(31) /* Lock bit. */
@@ -231,14 +230,14 @@ static u64 mlxbf_i2c_corepll_frequency;
#define MLXBF_I2C_MASTER_ENABLE_READ \
(MLXBF_I2C_MASTER_ENABLE | MLXBF_I2C_MASTER_CTL_READ_BIT)
-#define MLXBF_I2C_MASTER_SLV_ADDR_SHIFT 12 /* Slave address shift. */
-#define MLXBF_I2C_MASTER_WRITE_SHIFT 21 /* Control write bytes shift. */
-#define MLXBF_I2C_MASTER_SEND_PEC_SHIFT 20 /* Send PEC byte shift. */
-#define MLXBF_I2C_MASTER_PARSE_EXP_SHIFT 11 /* Parse expected bytes shift. */
-#define MLXBF_I2C_MASTER_READ_SHIFT 4 /* Control read bytes shift. */
+#define MLXBF_I2C_MASTER_WRITE_SHIFT 21 /* Control write bytes */
+#define MLXBF_I2C_MASTER_SEND_PEC_SHIFT 20 /* Send PEC byte when set to 1 */
+#define MLXBF_I2C_MASTER_PARSE_EXP_SHIFT 11 /* Control parse expected bytes */
+#define MLXBF_I2C_MASTER_SLV_ADDR_SHIFT 12 /* Slave address */
+#define MLXBF_I2C_MASTER_READ_SHIFT 4 /* Control read bytes */
/* SMBus master GW Data descriptor. */
-#define MLXBF_I2C_MASTER_DATA_DESC_ADDR 0x280
+#define MLXBF_I2C_MASTER_DATA_DESC_ADDR 0x80
#define MLXBF_I2C_MASTER_DATA_DESC_SIZE 0x80 /* Size in bytes. */
/* Maximum bytes to read/write per SMBus transaction. */
@@ -264,19 +263,21 @@ static u64 mlxbf_i2c_corepll_frequency;
#define MLXBF_I2C_SMBUS_MASTER_FSM_STOP_MASK BIT(31)
#define MLXBF_I2C_SMBUS_MASTER_FSM_PS_STATE_MASK BIT(15)
+#define MLXBF_I2C_SLV_ADDR_OFFSET 0x400
+
/* SMBus slave GW. */
-#define MLXBF_I2C_SMBUS_SLAVE_GW 0x400
+#define MLXBF_I2C_SMBUS_SLAVE_GW 0x0
/* Number of bytes received and sent from/to master. */
-#define MLXBF_I2C_SMBUS_SLAVE_RS_MASTER_BYTES 0x500
+#define MLXBF_I2C_SMBUS_SLAVE_RS_MASTER_BYTES 0x100
/* Packet error check (PEC) value. */
-#define MLXBF_I2C_SMBUS_SLAVE_PEC 0x504
+#define MLXBF_I2C_SMBUS_SLAVE_PEC 0x104
/* SMBus slave Finite State Machine (FSM). */
-#define MLXBF_I2C_SMBUS_SLAVE_FSM 0x510
+#define MLXBF_I2C_SMBUS_SLAVE_FSM 0x110
/*
* Should be set when all raised causes handled, and cleared by HW on
* every new cause.
*/
-#define MLXBF_I2C_SMBUS_SLAVE_READY 0x52c
+#define MLXBF_I2C_SMBUS_SLAVE_READY 0x12c
/* SMBus slave GW control bits offset in MLXBF_I2C_SMBUS_SLAVE_GW[31:19]. */
#define MLXBF_I2C_SLAVE_BUSY_BIT BIT(30) /* Busy bit. */
@@ -289,13 +290,13 @@ static u64 mlxbf_i2c_corepll_frequency;
#define MLXBF_I2C_SLAVE_SEND_PEC_SHIFT 21 /* Send PEC byte shift. */
/* SMBus slave GW Data descriptor. */
-#define MLXBF_I2C_SLAVE_DATA_DESC_ADDR 0x480
+#define MLXBF_I2C_SLAVE_DATA_DESC_ADDR 0x80
#define MLXBF_I2C_SLAVE_DATA_DESC_SIZE 0x80 /* Size in bytes. */
/* SMbus slave configuration registers. */
-#define MLXBF_I2C_SMBUS_SLAVE_ADDR_CFG 0x514
+#define MLXBF_I2C_SMBUS_SLAVE_ADDR_CFG 0x114
#define MLXBF_I2C_SMBUS_SLAVE_ADDR_CNT 16
-#define MLXBF_I2C_SMBUS_SLAVE_ADDR_EN_BIT 7
+#define MLXBF_I2C_SMBUS_SLAVE_ADDR_EN_BIT BIT(7)
#define MLXBF_I2C_SMBUS_SLAVE_ADDR_MASK GENMASK(6, 0)
/*
@@ -305,6 +306,59 @@ static u64 mlxbf_i2c_corepll_frequency;
#define MLXBF_I2C_SMBUS_TIMEOUT (300 * 1000) /* 300ms */
#define MLXBF_I2C_SMBUS_LOCK_POLL_TIMEOUT (300 * 1000) /* 300ms */
+/* Polling frequency in microseconds. */
+#define MLXBF_I2C_POLL_FREQ_IN_USEC 200
+
+#define MLXBF_I2C_SMBUS_OP_CNT_1 1
+#define MLXBF_I2C_SMBUS_OP_CNT_2 2
+#define MLXBF_I2C_SMBUS_OP_CNT_3 3
+#define MLXBF_I2C_SMBUS_MAX_OP_CNT MLXBF_I2C_SMBUS_OP_CNT_3
+
+/* Helper macro to define an I2C resource parameters. */
+#define MLXBF_I2C_RES_PARAMS(addr, size, str) \
+ { \
+ .start = (addr), \
+ .end = (addr) + (size) - 1, \
+ .name = (str) \
+ }
+
+enum {
+ MLXBF_I2C_TIMING_100KHZ = 100000,
+ MLXBF_I2C_TIMING_400KHZ = 400000,
+ MLXBF_I2C_TIMING_1000KHZ = 1000000,
+};
+
+enum {
+ MLXBF_I2C_F_READ = BIT(0),
+ MLXBF_I2C_F_WRITE = BIT(1),
+ MLXBF_I2C_F_NORESTART = BIT(3),
+ MLXBF_I2C_F_SMBUS_OPERATION = BIT(4),
+ MLXBF_I2C_F_SMBUS_BLOCK = BIT(5),
+ MLXBF_I2C_F_SMBUS_PEC = BIT(6),
+ MLXBF_I2C_F_SMBUS_PROCESS_CALL = BIT(7),
+};
+
+/* Mellanox BlueField chip type. */
+enum mlxbf_i2c_chip_type {
+ MLXBF_I2C_CHIP_TYPE_1, /* Mellanox BlueField-1 chip. */
+ MLXBF_I2C_CHIP_TYPE_2, /* Mellanox BlueField-2 chip. */
+ MLXBF_I2C_CHIP_TYPE_3 /* Mellanox BlueField-3 chip. */
+};
+
+/* List of chip resources that are being accessed by the driver. */
+enum {
+ MLXBF_I2C_SMBUS_RES,
+ MLXBF_I2C_MST_CAUSE_RES,
+ MLXBF_I2C_SLV_CAUSE_RES,
+ MLXBF_I2C_COALESCE_RES,
+ MLXBF_I2C_SMBUS_TIMER_RES,
+ MLXBF_I2C_SMBUS_MST_RES,
+ MLXBF_I2C_SMBUS_SLV_RES,
+ MLXBF_I2C_COREPLL_RES,
+ MLXBF_I2C_GPIO_RES,
+ MLXBF_I2C_END_RES
+};
+
/* Encapsulates timing parameters. */
struct mlxbf_i2c_timings {
u16 scl_high; /* Clock high period. */
@@ -324,27 +378,12 @@ struct mlxbf_i2c_timings {
u32 timeout; /* Detect clock low timeout. */
};
-enum {
- MLXBF_I2C_F_READ = BIT(0),
- MLXBF_I2C_F_WRITE = BIT(1),
- MLXBF_I2C_F_NORESTART = BIT(3),
- MLXBF_I2C_F_SMBUS_OPERATION = BIT(4),
- MLXBF_I2C_F_SMBUS_BLOCK = BIT(5),
- MLXBF_I2C_F_SMBUS_PEC = BIT(6),
- MLXBF_I2C_F_SMBUS_PROCESS_CALL = BIT(7),
-};
-
struct mlxbf_i2c_smbus_operation {
u32 flags;
u32 length; /* Buffer length in bytes. */
u8 *buffer;
};
-#define MLXBF_I2C_SMBUS_OP_CNT_1 1
-#define MLXBF_I2C_SMBUS_OP_CNT_2 2
-#define MLXBF_I2C_SMBUS_OP_CNT_3 3
-#define MLXBF_I2C_SMBUS_MAX_OP_CNT MLXBF_I2C_SMBUS_OP_CNT_3
-
struct mlxbf_i2c_smbus_request {
u8 slave;
u8 operation_cnt;
@@ -358,24 +397,38 @@ struct mlxbf_i2c_resource {
u8 type;
};
-/* List of chip resources that are being accessed by the driver. */
-enum {
- MLXBF_I2C_SMBUS_RES,
- MLXBF_I2C_MST_CAUSE_RES,
- MLXBF_I2C_SLV_CAUSE_RES,
- MLXBF_I2C_COALESCE_RES,
- MLXBF_I2C_COREPLL_RES,
- MLXBF_I2C_GPIO_RES,
- MLXBF_I2C_END_RES,
+struct mlxbf_i2c_chip_info {
+ enum mlxbf_i2c_chip_type type;
+ /* Chip shared resources that are being used by the I2C controller. */
+ struct mlxbf_i2c_resource *shared_res[MLXBF_I2C_SHARED_RES_MAX];
+
+ /* Callback to calculate the core PLL frequency. */
+ u64 (*calculate_freq)(struct mlxbf_i2c_resource *corepll_res);
+
+ /* Registers' address offset */
+ u32 smbus_master_rs_bytes_off;
+ u32 smbus_master_fsm_off;
};
-/* Helper macro to define an I2C resource parameters. */
-#define MLXBF_I2C_RES_PARAMS(addr, size, str) \
- { \
- .start = (addr), \
- .end = (addr) + (size) - 1, \
- .name = (str) \
- }
+struct mlxbf_i2c_priv {
+ const struct mlxbf_i2c_chip_info *chip;
+ struct i2c_adapter adap;
+ struct mlxbf_i2c_resource *smbus;
+ struct mlxbf_i2c_resource *timer;
+ struct mlxbf_i2c_resource *mst;
+ struct mlxbf_i2c_resource *slv;
+ struct mlxbf_i2c_resource *mst_cause;
+ struct mlxbf_i2c_resource *slv_cause;
+ struct mlxbf_i2c_resource *coalesce;
+ u64 frequency; /* Core frequency in Hz. */
+ int bus; /* Physical bus identifier. */
+ int irq;
+ struct i2c_client *slave[MLXBF_I2C_SMBUS_SLAVE_ADDR_CNT];
+ u32 resource_version;
+};
+
+/* Core PLL frequency. */
+static u64 mlxbf_i2c_corepll_frequency;
static struct resource mlxbf_i2c_coalesce_tyu_params =
MLXBF_I2C_RES_PARAMS(MLXBF_I2C_COALESCE_TYU_ADDR,
@@ -389,6 +442,10 @@ static struct resource mlxbf_i2c_corepll_yu_params =
MLXBF_I2C_RES_PARAMS(MLXBF_I2C_COREPLL_YU_ADDR,
MLXBF_I2C_COREPLL_YU_SIZE,
"COREPLL_MEM");
+static struct resource mlxbf_i2c_corepll_rsh_yu_params =
+ MLXBF_I2C_RES_PARAMS(MLXBF_I2C_COREPLL_RSH_YU_ADDR,
+ MLXBF_I2C_COREPLL_RSH_YU_SIZE,
+ "COREPLL_MEM");
static struct resource mlxbf_i2c_gpio_tyu_params =
MLXBF_I2C_RES_PARAMS(MLXBF_I2C_GPIO_TYU_ADDR,
MLXBF_I2C_GPIO_TYU_SIZE,
@@ -398,34 +455,6 @@ static struct mutex mlxbf_i2c_coalesce_lock;
static struct mutex mlxbf_i2c_corepll_lock;
static struct mutex mlxbf_i2c_gpio_lock;
-/* Mellanox BlueField chip type. */
-enum mlxbf_i2c_chip_type {
- MLXBF_I2C_CHIP_TYPE_1, /* Mellanox BlueField-1 chip. */
- MLXBF_I2C_CHIP_TYPE_2, /* Mallanox BlueField-2 chip. */
-};
-
-struct mlxbf_i2c_chip_info {
- enum mlxbf_i2c_chip_type type;
- /* Chip shared resources that are being used by the I2C controller. */
- struct mlxbf_i2c_resource *shared_res[MLXBF_I2C_SHARED_RES_MAX];
-
- /* Callback to calculate the core PLL frequency. */
- u64 (*calculate_freq)(struct mlxbf_i2c_resource *corepll_res);
-};
-
-struct mlxbf_i2c_priv {
- const struct mlxbf_i2c_chip_info *chip;
- struct i2c_adapter adap;
- struct mlxbf_i2c_resource *smbus;
- struct mlxbf_i2c_resource *mst_cause;
- struct mlxbf_i2c_resource *slv_cause;
- struct mlxbf_i2c_resource *coalesce;
- u64 frequency; /* Core frequency in Hz. */
- int bus; /* Physical bus identifier. */
- int irq;
- struct i2c_client *slave[MLXBF_I2C_SMBUS_SLAVE_ADDR_CNT];
-};
-
static struct mlxbf_i2c_resource mlxbf_i2c_coalesce_res[] = {
[MLXBF_I2C_CHIP_TYPE_1] = {
.params = &mlxbf_i2c_coalesce_tyu_params,
@@ -445,6 +474,11 @@ static struct mlxbf_i2c_resource mlxbf_i2c_corepll_res[] = {
.params = &mlxbf_i2c_corepll_yu_params,
.lock = &mlxbf_i2c_corepll_lock,
.type = MLXBF_I2C_COREPLL_RES,
+ },
+ [MLXBF_I2C_CHIP_TYPE_3] = {
+ .params = &mlxbf_i2c_corepll_rsh_yu_params,
+ .lock = &mlxbf_i2c_corepll_lock,
+ .type = MLXBF_I2C_COREPLL_RES,
}
};
@@ -461,24 +495,13 @@ static u8 mlxbf_i2c_bus_count;
static struct mutex mlxbf_i2c_bus_lock;
-/* Polling frequency in microseconds. */
-#define MLXBF_I2C_POLL_FREQ_IN_USEC 200
-
-#define MLXBF_I2C_SHIFT_0 0
-#define MLXBF_I2C_SHIFT_8 8
-#define MLXBF_I2C_SHIFT_16 16
-#define MLXBF_I2C_SHIFT_24 24
-
-#define MLXBF_I2C_MASK_8 GENMASK(7, 0)
-#define MLXBF_I2C_MASK_16 GENMASK(15, 0)
-
/*
* Function to poll a set of bits at a specific address; it checks whether
* the bits are equal to zero when eq_zero is set to 'true', and not equal
* to zero when eq_zero is set to 'false'.
* Note that the timeout is given in microseconds.
*/
-static u32 mlxbf_smbus_poll(void __iomem *io, u32 addr, u32 mask,
+static u32 mlxbf_i2c_poll(void __iomem *io, u32 addr, u32 mask,
bool eq_zero, u32 timeout)
{
u32 bits;
@@ -500,13 +523,13 @@ static u32 mlxbf_smbus_poll(void __iomem *io, u32 addr, u32 mask,
* a transaction. Accordingly, this function polls the Master FSM stop
* bit; it returns false when the bit is asserted, true if not.
*/
-static bool mlxbf_smbus_master_wait_for_idle(struct mlxbf_i2c_priv *priv)
+static bool mlxbf_i2c_smbus_master_wait_for_idle(struct mlxbf_i2c_priv *priv)
{
u32 mask = MLXBF_I2C_SMBUS_MASTER_FSM_STOP_MASK;
- u32 addr = MLXBF_I2C_SMBUS_MASTER_FSM;
+ u32 addr = priv->chip->smbus_master_fsm_off;
u32 timeout = MLXBF_I2C_SMBUS_TIMEOUT;
- if (mlxbf_smbus_poll(priv->smbus->io, addr, mask, true, timeout))
+ if (mlxbf_i2c_poll(priv->mst->io, addr, mask, true, timeout))
return true;
return false;
@@ -517,7 +540,7 @@ static bool mlxbf_smbus_master_wait_for_idle(struct mlxbf_i2c_priv *priv)
*/
static bool mlxbf_i2c_smbus_master_lock(struct mlxbf_i2c_priv *priv)
{
- if (mlxbf_smbus_poll(priv->smbus->io, MLXBF_I2C_SMBUS_MASTER_GW,
+ if (mlxbf_i2c_poll(priv->mst->io, MLXBF_I2C_SMBUS_MASTER_GW,
MLXBF_I2C_MASTER_LOCK_BIT, true,
MLXBF_I2C_SMBUS_LOCK_POLL_TIMEOUT))
return true;
@@ -528,7 +551,7 @@ static bool mlxbf_i2c_smbus_master_lock(struct mlxbf_i2c_priv *priv)
static void mlxbf_i2c_smbus_master_unlock(struct mlxbf_i2c_priv *priv)
{
/* Clear the gw to clear the lock */
- writel(0, priv->smbus->io + MLXBF_I2C_SMBUS_MASTER_GW);
+ writel(0, priv->mst->io + MLXBF_I2C_SMBUS_MASTER_GW);
}
static bool mlxbf_i2c_smbus_transaction_success(u32 master_status,
@@ -568,7 +591,7 @@ static int mlxbf_i2c_smbus_check_status(struct mlxbf_i2c_priv *priv)
* then read the cause and master status bits to determine if
* errors occurred during the transaction.
*/
- mlxbf_smbus_poll(priv->smbus->io, MLXBF_I2C_SMBUS_MASTER_GW,
+ mlxbf_i2c_poll(priv->mst->io, MLXBF_I2C_SMBUS_MASTER_GW,
MLXBF_I2C_MASTER_BUSY_BIT, true,
MLXBF_I2C_SMBUS_TIMEOUT);
@@ -581,7 +604,7 @@ static int mlxbf_i2c_smbus_check_status(struct mlxbf_i2c_priv *priv)
* Parse both Cause and Master GW bits, then return transaction status.
*/
- master_status_bits = readl(priv->smbus->io +
+ master_status_bits = readl(priv->mst->io +
MLXBF_I2C_SMBUS_MASTER_STATUS);
master_status_bits &= MLXBF_I2C_SMBUS_MASTER_STATUS_MASK;
@@ -606,7 +629,8 @@ static int mlxbf_i2c_smbus_check_status(struct mlxbf_i2c_priv *priv)
}
static void mlxbf_i2c_smbus_write_data(struct mlxbf_i2c_priv *priv,
- const u8 *data, u8 length, u32 addr)
+ const u8 *data, u8 length, u32 addr,
+ bool is_master)
{
u8 offset, aligned_length;
u32 data32;
@@ -623,12 +647,16 @@ static void mlxbf_i2c_smbus_write_data(struct mlxbf_i2c_priv *priv,
*/
for (offset = 0; offset < aligned_length; offset += sizeof(u32)) {
data32 = *((u32 *)(data + offset));
- iowrite32be(data32, priv->smbus->io + addr + offset);
+ if (is_master)
+ iowrite32be(data32, priv->mst->io + addr + offset);
+ else
+ iowrite32be(data32, priv->slv->io + addr + offset);
}
}
static void mlxbf_i2c_smbus_read_data(struct mlxbf_i2c_priv *priv,
- u8 *data, u8 length, u32 addr)
+ u8 *data, u8 length, u32 addr,
+ bool is_master)
{
u32 data32, mask;
u8 byte, offset;
@@ -644,14 +672,20 @@ static void mlxbf_i2c_smbus_read_data(struct mlxbf_i2c_priv *priv,
*/
for (offset = 0; offset < (length & ~mask); offset += sizeof(u32)) {
- data32 = ioread32be(priv->smbus->io + addr + offset);
+ if (is_master)
+ data32 = ioread32be(priv->mst->io + addr + offset);
+ else
+ data32 = ioread32be(priv->slv->io + addr + offset);
*((u32 *)(data + offset)) = data32;
}
if (!(length & mask))
return;
- data32 = ioread32be(priv->smbus->io + addr + offset);
+ if (is_master)
+ data32 = ioread32be(priv->mst->io + addr + offset);
+ else
+ data32 = ioread32be(priv->slv->io + addr + offset);
for (byte = 0; byte < (length & mask); byte++) {
data[offset + byte] = data32 & GENMASK(7, 0);
@@ -677,16 +711,16 @@ static int mlxbf_i2c_smbus_enable(struct mlxbf_i2c_priv *priv, u8 slave,
command |= rol32(pec_en, MLXBF_I2C_MASTER_SEND_PEC_SHIFT);
/* Clear status bits. */
- writel(0x0, priv->smbus->io + MLXBF_I2C_SMBUS_MASTER_STATUS);
+ writel(0x0, priv->mst->io + MLXBF_I2C_SMBUS_MASTER_STATUS);
/* Set the cause data. */
writel(~0x0, priv->mst_cause->io + MLXBF_I2C_CAUSE_OR_CLEAR);
/* Zero PEC byte. */
- writel(0x0, priv->smbus->io + MLXBF_I2C_SMBUS_MASTER_PEC);
+ writel(0x0, priv->mst->io + MLXBF_I2C_SMBUS_MASTER_PEC);
/* Zero byte count. */
- writel(0x0, priv->smbus->io + MLXBF_I2C_SMBUS_RS_BYTES);
+ writel(0x0, priv->mst->io + priv->chip->smbus_master_rs_bytes_off);
/* GW activation. */
- writel(command, priv->smbus->io + MLXBF_I2C_SMBUS_MASTER_GW);
+ writel(command, priv->mst->io + MLXBF_I2C_SMBUS_MASTER_GW);
/*
* Poll master status and check status bits. An ACK is sent when
@@ -730,7 +764,7 @@ mlxbf_i2c_smbus_start_transaction(struct mlxbf_i2c_priv *priv,
return -EBUSY;
/* Check whether the HW is idle */
- if (WARN_ON(!mlxbf_smbus_master_wait_for_idle(priv))) {
+ if (WARN_ON(!mlxbf_i2c_smbus_master_wait_for_idle(priv))) {
ret = -EBUSY;
goto out_unlock;
}
@@ -787,7 +821,7 @@ mlxbf_i2c_smbus_start_transaction(struct mlxbf_i2c_priv *priv,
* must be written to the data registers.
*/
mlxbf_i2c_smbus_write_data(priv, (const u8 *)data_desc, data_len,
- MLXBF_I2C_MASTER_DATA_DESC_ADDR);
+ MLXBF_I2C_MASTER_DATA_DESC_ADDR, true);
if (write_en) {
ret = mlxbf_i2c_smbus_enable(priv, slave, write_len, block_en,
@@ -799,13 +833,13 @@ mlxbf_i2c_smbus_start_transaction(struct mlxbf_i2c_priv *priv,
if (read_en) {
/* Write slave address to Master GW data descriptor. */
mlxbf_i2c_smbus_write_data(priv, (const u8 *)&addr, 1,
- MLXBF_I2C_MASTER_DATA_DESC_ADDR);
+ MLXBF_I2C_MASTER_DATA_DESC_ADDR, true);
ret = mlxbf_i2c_smbus_enable(priv, slave, read_len, block_en,
pec_en, 1);
if (!ret) {
/* Get Master GW data descriptor. */
mlxbf_i2c_smbus_read_data(priv, data_desc, read_len + 1,
- MLXBF_I2C_MASTER_DATA_DESC_ADDR);
+ MLXBF_I2C_MASTER_DATA_DESC_ADDR, true);
/* Get data from Master GW data descriptor. */
memcpy(read_buf, data_desc, read_len + 1);
@@ -817,7 +851,7 @@ mlxbf_i2c_smbus_start_transaction(struct mlxbf_i2c_priv *priv,
* next tag integration.
*/
writel(MLXBF_I2C_SMBUS_MASTER_FSM_PS_STATE_MASK,
- priv->smbus->io + MLXBF_I2C_SMBUS_MASTER_FSM);
+ priv->mst->io + priv->chip->smbus_master_fsm_off);
}
out_unlock:
@@ -1109,7 +1143,7 @@ static void mlxbf_i2c_set_timings(struct mlxbf_i2c_priv *priv,
timer |= mlxbf_i2c_set_timer(priv, timings->scl_low,
false, MLXBF_I2C_MASK_16,
MLXBF_I2C_SHIFT_16);
- writel(timer, priv->smbus->io +
+ writel(timer, priv->timer->io +
MLXBF_I2C_SMBUS_TIMER_SCL_LOW_SCL_HIGH);
timer = mlxbf_i2c_set_timer(priv, timings->sda_rise, false,
@@ -1120,34 +1154,34 @@ static void mlxbf_i2c_set_timings(struct mlxbf_i2c_priv *priv,
MLXBF_I2C_MASK_8, MLXBF_I2C_SHIFT_16);
timer |= mlxbf_i2c_set_timer(priv, timings->scl_fall, false,
MLXBF_I2C_MASK_8, MLXBF_I2C_SHIFT_24);
- writel(timer, priv->smbus->io +
+ writel(timer, priv->timer->io +
MLXBF_I2C_SMBUS_TIMER_FALL_RISE_SPIKE);
timer = mlxbf_i2c_set_timer(priv, timings->hold_start, true,
MLXBF_I2C_MASK_16, MLXBF_I2C_SHIFT_0);
timer |= mlxbf_i2c_set_timer(priv, timings->hold_data, true,
MLXBF_I2C_MASK_16, MLXBF_I2C_SHIFT_16);
- writel(timer, priv->smbus->io + MLXBF_I2C_SMBUS_TIMER_THOLD);
+ writel(timer, priv->timer->io + MLXBF_I2C_SMBUS_TIMER_THOLD);
timer = mlxbf_i2c_set_timer(priv, timings->setup_start, true,
MLXBF_I2C_MASK_16, MLXBF_I2C_SHIFT_0);
timer |= mlxbf_i2c_set_timer(priv, timings->setup_stop, true,
MLXBF_I2C_MASK_16, MLXBF_I2C_SHIFT_16);
- writel(timer, priv->smbus->io +
+ writel(timer, priv->timer->io +
MLXBF_I2C_SMBUS_TIMER_TSETUP_START_STOP);
timer = mlxbf_i2c_set_timer(priv, timings->setup_data, true,
MLXBF_I2C_MASK_16, MLXBF_I2C_SHIFT_0);
- writel(timer, priv->smbus->io + MLXBF_I2C_SMBUS_TIMER_TSETUP_DATA);
+ writel(timer, priv->timer->io + MLXBF_I2C_SMBUS_TIMER_TSETUP_DATA);
timer = mlxbf_i2c_set_timer(priv, timings->buf, false,
MLXBF_I2C_MASK_16, MLXBF_I2C_SHIFT_0);
timer |= mlxbf_i2c_set_timer(priv, timings->thigh_max, false,
MLXBF_I2C_MASK_16, MLXBF_I2C_SHIFT_16);
- writel(timer, priv->smbus->io + MLXBF_I2C_SMBUS_THIGH_MAX_TBUF);
+ writel(timer, priv->timer->io + MLXBF_I2C_SMBUS_THIGH_MAX_TBUF);
timer = timings->timeout;
- writel(timer, priv->smbus->io + MLXBF_I2C_SMBUS_SCL_LOW_TIMEOUT);
+ writel(timer, priv->timer->io + MLXBF_I2C_SMBUS_SCL_LOW_TIMEOUT);
}
enum mlxbf_i2c_timings_config {
@@ -1559,7 +1593,7 @@ static int mlxbf_i2c_slave_enable(struct mlxbf_i2c_priv *priv,
* Look for the next available slave register slot.
*/
for (reg = 0; reg < reg_cnt; reg++) {
- slave_reg = readl(priv->smbus->io +
+ slave_reg = readl(priv->slv->io +
MLXBF_I2C_SMBUS_SLAVE_ADDR_CFG + reg * 0x4);
/*
* Each register holds 4 slave addresses. So, we have to keep
@@ -1581,7 +1615,7 @@ static int mlxbf_i2c_slave_enable(struct mlxbf_i2c_priv *priv,
slave_reg &= ~(MLXBF_I2C_SMBUS_SLAVE_ADDR_MASK << (byte * 8));
slave_reg |= (slave->addr << (byte * 8));
slave_reg |= MLXBF_I2C_SMBUS_SLAVE_ADDR_EN_BIT << (byte * 8);
- writel(slave_reg, priv->smbus->io +
+ writel(slave_reg, priv->slv->io +
MLXBF_I2C_SMBUS_SLAVE_ADDR_CFG +
(reg * 0x4));
@@ -1616,7 +1650,7 @@ static int mlxbf_i2c_slave_disable(struct mlxbf_i2c_priv *priv, u8 addr)
* Check if addr is present in the registers.
*/
for (reg = 0; reg < reg_cnt; reg++) {
- slave_reg = readl(priv->smbus->io +
+ slave_reg = readl(priv->slv->io +
MLXBF_I2C_SMBUS_SLAVE_ADDR_CFG + reg * 0x4);
/* Check whether the address slots are empty. */
@@ -1637,7 +1671,7 @@ static int mlxbf_i2c_slave_disable(struct mlxbf_i2c_priv *priv, u8 addr)
if (addr_tmp == addr) {
/* Clear the slave address slot. */
slave_reg &= ~(GENMASK(7, 0) << (byte * 8));
- writel(slave_reg, priv->smbus->io +
+ writel(slave_reg, priv->slv->io +
MLXBF_I2C_SMBUS_SLAVE_ADDR_CFG +
(reg * 0x4));
/* Free slave at the corresponding index */
@@ -1741,7 +1775,7 @@ static int mlxbf_i2c_init_slave(struct platform_device *pdev,
int ret;
/* Reset FSM. */
- writel(0, priv->smbus->io + MLXBF_I2C_SMBUS_SLAVE_FSM);
+ writel(0, priv->slv->io + MLXBF_I2C_SMBUS_SLAVE_FSM);
/*
* Enable slave cause interrupt bits. Drive
@@ -1756,7 +1790,7 @@ static int mlxbf_i2c_init_slave(struct platform_device *pdev,
writel(int_reg, priv->slv_cause->io + MLXBF_I2C_CAUSE_OR_EVTEN0);
/* Finally, set the 'ready' bit to start handling transactions. */
- writel(0x1, priv->smbus->io + MLXBF_I2C_SMBUS_SLAVE_READY);
+ writel(0x1, priv->slv->io + MLXBF_I2C_SMBUS_SLAVE_READY);
/* Initialize the cause coalesce resource. */
ret = mlxbf_i2c_init_coalesce(pdev, priv);
@@ -1801,13 +1835,13 @@ static bool mlxbf_i2c_has_coalesce(struct mlxbf_i2c_priv *priv, bool *read,
return true;
}
-static bool mlxbf_smbus_slave_wait_for_idle(struct mlxbf_i2c_priv *priv,
+static bool mlxbf_i2c_slave_wait_for_idle(struct mlxbf_i2c_priv *priv,
u32 timeout)
{
u32 mask = MLXBF_I2C_CAUSE_S_GW_BUSY_FALL;
u32 addr = MLXBF_I2C_CAUSE_ARBITER;
- if (mlxbf_smbus_poll(priv->slv_cause->io, addr, mask, false, timeout))
+ if (mlxbf_i2c_poll(priv->slv_cause->io, addr, mask, false, timeout))
return true;
return false;
@@ -1846,7 +1880,7 @@ static int mlxbf_i2c_irq_send(struct mlxbf_i2c_priv *priv, u8 recv_bytes)
* determine the slave address. This byte is located in the
* first data descriptor register of the slave GW.
*/
- data32 = ioread32be(priv->smbus->io +
+ data32 = ioread32be(priv->slv->io +
MLXBF_I2C_SLAVE_DATA_DESC_ADDR);
addr = (data32 & GENMASK(7, 0)) >> 1;
@@ -1900,7 +1934,7 @@ static int mlxbf_i2c_irq_send(struct mlxbf_i2c_priv *priv, u8 recv_bytes)
/* Write data to Slave GW data descriptor. */
mlxbf_i2c_smbus_write_data(priv, data_desc, byte_cnt,
- MLXBF_I2C_SLAVE_DATA_DESC_ADDR);
+ MLXBF_I2C_SLAVE_DATA_DESC_ADDR, false);
pec_en = 0; /* Disable PEC since it is not supported. */
@@ -1909,19 +1943,19 @@ static int mlxbf_i2c_irq_send(struct mlxbf_i2c_priv *priv, u8 recv_bytes)
control32 |= rol32(write_size, MLXBF_I2C_SLAVE_WRITE_BYTES_SHIFT);
control32 |= rol32(pec_en, MLXBF_I2C_SLAVE_SEND_PEC_SHIFT);
- writel(control32, priv->smbus->io + MLXBF_I2C_SMBUS_SLAVE_GW);
+ writel(control32, priv->slv->io + MLXBF_I2C_SMBUS_SLAVE_GW);
/*
* Wait until the transfer is completed; the driver will wait
* until the GW is idle, a cause will rise on fall of GW busy.
*/
- mlxbf_smbus_slave_wait_for_idle(priv, MLXBF_I2C_SMBUS_TIMEOUT);
+ mlxbf_i2c_slave_wait_for_idle(priv, MLXBF_I2C_SMBUS_TIMEOUT);
clear_csr:
/* Release the Slave GW. */
- writel(0x0, priv->smbus->io + MLXBF_I2C_SMBUS_SLAVE_RS_MASTER_BYTES);
- writel(0x0, priv->smbus->io + MLXBF_I2C_SMBUS_SLAVE_PEC);
- writel(0x1, priv->smbus->io + MLXBF_I2C_SMBUS_SLAVE_READY);
+ writel(0x0, priv->slv->io + MLXBF_I2C_SMBUS_SLAVE_RS_MASTER_BYTES);
+ writel(0x0, priv->slv->io + MLXBF_I2C_SMBUS_SLAVE_PEC);
+ writel(0x1, priv->slv->io + MLXBF_I2C_SMBUS_SLAVE_READY);
return ret;
}
@@ -1939,7 +1973,7 @@ static int mlxbf_i2c_irq_recv(struct mlxbf_i2c_priv *priv, u8 recv_bytes)
/* Read data from Slave GW data descriptor. */
mlxbf_i2c_smbus_read_data(priv, data_desc, recv_bytes,
- MLXBF_I2C_SLAVE_DATA_DESC_ADDR);
+ MLXBF_I2C_SLAVE_DATA_DESC_ADDR, false);
addr = data_desc[0] >> 1;
/*
@@ -1975,9 +2009,9 @@ static int mlxbf_i2c_irq_recv(struct mlxbf_i2c_priv *priv, u8 recv_bytes)
clear_csr:
/* Release the Slave GW. */
- writel(0x0, priv->smbus->io + MLXBF_I2C_SMBUS_SLAVE_RS_MASTER_BYTES);
- writel(0x0, priv->smbus->io + MLXBF_I2C_SMBUS_SLAVE_PEC);
- writel(0x1, priv->smbus->io + MLXBF_I2C_SMBUS_SLAVE_READY);
+ writel(0x0, priv->slv->io + MLXBF_I2C_SMBUS_SLAVE_RS_MASTER_BYTES);
+ writel(0x0, priv->slv->io + MLXBF_I2C_SMBUS_SLAVE_PEC);
+ writel(0x1, priv->slv->io + MLXBF_I2C_SMBUS_SLAVE_READY);
return ret;
}
@@ -2012,7 +2046,7 @@ static irqreturn_t mlxbf_i2c_irq(int irq, void *ptr)
* slave, if the higher 8 bits are sent then the slave expect N bytes
* from the master.
*/
- rw_bytes_reg = readl(priv->smbus->io +
+ rw_bytes_reg = readl(priv->slv->io +
MLXBF_I2C_SMBUS_SLAVE_RS_MASTER_BYTES);
recv_bytes = (rw_bytes_reg >> 8) & GENMASK(7, 0);
@@ -2177,14 +2211,27 @@ static struct mlxbf_i2c_chip_info mlxbf_i2c_chip[] = {
[1] = &mlxbf_i2c_corepll_res[MLXBF_I2C_CHIP_TYPE_1],
[2] = &mlxbf_i2c_gpio_res[MLXBF_I2C_CHIP_TYPE_1]
},
- .calculate_freq = mlxbf_i2c_calculate_freq_from_tyu
+ .calculate_freq = mlxbf_i2c_calculate_freq_from_tyu,
+ .smbus_master_rs_bytes_off = MLXBF_I2C_YU_SMBUS_RS_BYTES,
+ .smbus_master_fsm_off = MLXBF_I2C_YU_SMBUS_MASTER_FSM
},
[MLXBF_I2C_CHIP_TYPE_2] = {
.type = MLXBF_I2C_CHIP_TYPE_2,
.shared_res = {
[0] = &mlxbf_i2c_corepll_res[MLXBF_I2C_CHIP_TYPE_2]
},
- .calculate_freq = mlxbf_i2c_calculate_freq_from_yu
+ .calculate_freq = mlxbf_i2c_calculate_freq_from_yu,
+ .smbus_master_rs_bytes_off = MLXBF_I2C_YU_SMBUS_RS_BYTES,
+ .smbus_master_fsm_off = MLXBF_I2C_YU_SMBUS_MASTER_FSM
+ },
+ [MLXBF_I2C_CHIP_TYPE_3] = {
+ .type = MLXBF_I2C_CHIP_TYPE_3,
+ .shared_res = {
+ [0] = &mlxbf_i2c_corepll_res[MLXBF_I2C_CHIP_TYPE_3]
+ },
+ .calculate_freq = mlxbf_i2c_calculate_freq_from_yu,
+ .smbus_master_rs_bytes_off = MLXBF_I2C_RSH_YU_SMBUS_RS_BYTES,
+ .smbus_master_fsm_off = MLXBF_I2C_RSH_YU_SMBUS_MASTER_FSM
}
};
@@ -2209,6 +2256,10 @@ static const struct of_device_id mlxbf_i2c_dt_ids[] = {
.compatible = "mellanox,i2c-mlxbf2",
.data = &mlxbf_i2c_chip[MLXBF_I2C_CHIP_TYPE_2]
},
+ {
+ .compatible = "mellanox,i2c-mlxbf3",
+ .data = &mlxbf_i2c_chip[MLXBF_I2C_CHIP_TYPE_3]
+ },
{},
};
@@ -2218,6 +2269,7 @@ MODULE_DEVICE_TABLE(of, mlxbf_i2c_dt_ids);
static const struct acpi_device_id mlxbf_i2c_acpi_ids[] = {
{ "MLNXBF03", (kernel_ulong_t)&mlxbf_i2c_chip[MLXBF_I2C_CHIP_TYPE_1] },
{ "MLNXBF23", (kernel_ulong_t)&mlxbf_i2c_chip[MLXBF_I2C_CHIP_TYPE_2] },
+ { "MLNXBF31", (kernel_ulong_t)&mlxbf_i2c_chip[MLXBF_I2C_CHIP_TYPE_3] },
{},
};
@@ -2293,6 +2345,7 @@ static int mlxbf_i2c_probe(struct platform_device *pdev)
struct device *dev = &pdev->dev;
struct mlxbf_i2c_priv *priv;
struct i2c_adapter *adap;
+ u32 resource_version;
int irq, ret;
priv = devm_kzalloc(dev, sizeof(struct mlxbf_i2c_priv), GFP_KERNEL);
@@ -2306,11 +2359,55 @@ static int mlxbf_i2c_probe(struct platform_device *pdev)
if (ret < 0)
return ret;
- ret = mlxbf_i2c_init_resource(pdev, &priv->smbus,
- MLXBF_I2C_SMBUS_RES);
- if (ret < 0) {
- dev_err(dev, "Cannot fetch smbus resource info");
- return ret;
+ /* This property allows the driver to stay backward compatible with older
+ * ACPI table and device trees versions.
+ * Starting BlueField-3 SoC, the "smbus" resource was broken down into 3
+ * separate resources "timer", "master" and "slave".
+ */
+ if (device_property_read_u32(dev, "resource_version", &resource_version))
+ resource_version = 0;
+
+ priv->resource_version = resource_version;
+
+ if (priv->chip->type < MLXBF_I2C_CHIP_TYPE_3 && resource_version == 0) {
+ priv->timer = devm_kzalloc(dev, sizeof(struct mlxbf_i2c_resource), GFP_KERNEL);
+ if (!priv->timer)
+ return -ENOMEM;
+
+ priv->mst = devm_kzalloc(dev, sizeof(struct mlxbf_i2c_resource), GFP_KERNEL);
+ if (!priv->mst)
+ return -ENOMEM;
+
+ priv->slv = devm_kzalloc(dev, sizeof(struct mlxbf_i2c_resource), GFP_KERNEL);
+ if (!priv->slv)
+ return -ENOMEM;
+
+ ret = mlxbf_i2c_init_resource(pdev, &priv->smbus,
+ MLXBF_I2C_SMBUS_RES);
+ priv->timer->io = priv->smbus->io;
+ priv->mst->io = priv->smbus->io + MLXBF_I2C_MST_ADDR_OFFSET;
+ priv->slv->io = priv->smbus->io + MLXBF_I2C_SLV_ADDR_OFFSET;
+ } else {
+ ret = mlxbf_i2c_init_resource(pdev, &priv->timer,
+ MLXBF_I2C_SMBUS_TIMER_RES);
+ if (ret < 0) {
+ dev_err(dev, "Cannot fetch timer resource info");
+ return ret;
+ }
+
+ ret = mlxbf_i2c_init_resource(pdev, &priv->mst,
+ MLXBF_I2C_SMBUS_MST_RES);
+ if (ret < 0) {
+ dev_err(dev, "Cannot fetch master resource info");
+ return ret;
+ }
+
+ ret = mlxbf_i2c_init_resource(pdev, &priv->slv,
+ MLXBF_I2C_SMBUS_SLV_RES);
+ if (ret < 0) {
+ dev_err(dev, "Cannot fetch slave resource info");
+ return ret;
+ }
}
ret = mlxbf_i2c_init_resource(pdev, &priv->mst_cause,
@@ -2398,8 +2495,19 @@ static int mlxbf_i2c_remove(struct platform_device *pdev)
struct device *dev = &pdev->dev;
struct resource *params;
- params = priv->smbus->params;
- devm_release_mem_region(dev, params->start, resource_size(params));
+ if (priv->chip->type < MLXBF_I2C_CHIP_TYPE_3 && priv->resource_version == 0) {
+ params = priv->smbus->params;
+ devm_release_mem_region(dev, params->start, resource_size(params));
+ } else {
+ params = priv->timer->params;
+ devm_release_mem_region(dev, params->start, resource_size(params));
+
+ params = priv->mst->params;
+ devm_release_mem_region(dev, params->start, resource_size(params));
+
+ params = priv->slv->params;
+ devm_release_mem_region(dev, params->start, resource_size(params));
+ }
params = priv->mst_cause->params;
devm_release_mem_region(dev, params->start, resource_size(params));