(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
#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
/*
/* 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. */
#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
#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. */
#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. */
#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. */
#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)
- #define MLXBF_I2C_SLAVE_ADDR_ENABLED(addr) \
- ((addr) & (1 << MLXBF_I2C_SMBUS_SLAVE_ADDR_EN_BIT))
-
/*
* Timeout is given in microsends. Note also that timeout handling is not
* exact.
*/
#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 {
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;
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,
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,
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;
- };
-
static struct mlxbf_i2c_resource mlxbf_i2c_coalesce_res[] = {
[MLXBF_I2C_CHIP_TYPE_1] = {
.params = &mlxbf_i2c_coalesce_tyu_params,
.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,
}
};
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;
* 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;
+ }
+
+ /*
+ * wait for the lock to be released before acquiring it.
+ */
+ static bool mlxbf_i2c_smbus_master_lock(struct mlxbf_i2c_priv *priv)
+ {
+ 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;
return false;
}
+ static void mlxbf_i2c_smbus_master_unlock(struct mlxbf_i2c_priv *priv)
+ {
+ /* Clear the gw to clear the lock */
+ writel(0, priv->mst->io + MLXBF_I2C_SMBUS_MASTER_GW);
+ }
+
static bool mlxbf_i2c_smbus_transaction_success(u32 master_status,
u32 cause_status)
{
* 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);
* 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;
}
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;
*/
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;
*/
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);
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
slave = request->slave & GENMASK(6, 0);
addr = slave << 1;
- /* First of all, check whether the HW is idle. */
- if (WARN_ON(!mlxbf_smbus_master_wait_for_idle(priv)))
+ /*
+ * Try to acquire the smbus gw lock before any reads of the GW register since
+ * a read sets the lock.
+ */
+ if (WARN_ON(!mlxbf_i2c_smbus_master_lock(priv)))
return -EBUSY;
+ /* Check whether the HW is idle */
+ if (WARN_ON(!mlxbf_i2c_smbus_master_wait_for_idle(priv))) {
+ ret = -EBUSY;
+ goto out_unlock;
+ }
+
/* Set first byte. */
data_desc[data_idx++] = addr;
write_en = 1;
write_len += operation->length;
if (data_idx + operation->length >
- MLXBF_I2C_MASTER_DATA_DESC_SIZE)
- return -ENOBUFS;
+ MLXBF_I2C_MASTER_DATA_DESC_SIZE) {
+ ret = -ENOBUFS;
+ goto out_unlock;
+ }
memcpy(data_desc + data_idx,
operation->buffer, operation->length);
data_idx += operation->length;
* 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,
pec_en, 0);
if (ret)
- return ret;
+ goto out_unlock;
}
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);
* 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:
+ mlxbf_i2c_smbus_master_unlock(priv);
+
return ret;
}
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,
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 {
return 0;
}
- static int mlxbf_slave_enable(struct mlxbf_i2c_priv *priv, u8 addr)
+ static int mlxbf_i2c_slave_enable(struct mlxbf_i2c_priv *priv,
+ struct i2c_client *slave)
{
- u32 slave_reg, slave_reg_tmp, slave_reg_avail, slave_addr_mask;
- u8 reg, reg_cnt, byte, addr_tmp, reg_avail, byte_avail;
- bool avail, disabled;
-
- disabled = false;
- avail = false;
+ u8 reg, reg_cnt, byte, addr_tmp;
+ u32 slave_reg, slave_reg_tmp;
if (!priv)
return -EPERM;
reg_cnt = MLXBF_I2C_SMBUS_SLAVE_ADDR_CNT >> 2;
- slave_addr_mask = MLXBF_I2C_SMBUS_SLAVE_ADDR_MASK;
/*
* Read the slave registers. There are 4 * 32-bit slave registers.
- * Each slave register can hold up to 4 * 8-bit slave configuration
- * (7-bit address, 1 status bit (1 if enabled, 0 if not)).
+ * Each slave register can hold up to 4 * 8-bit slave configuration:
+ * 1) A 7-bit address
+ * 2) And a status bit (1 if enabled, 0 if not).
+ * 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
addr_tmp = slave_reg_tmp & GENMASK(7, 0);
/*
- * Mark the first available slave address slot, i.e. its
- * enabled bit should be unset. This slot might be used
- * later on to register our slave.
+ * If an enable bit is not set in the
+ * MLXBF_I2C_SMBUS_SLAVE_ADDR_CFG register, then the
+ * slave address slot associated with that bit is
+ * free. So set the enable bit and write the
+ * slave address bits.
*/
- if (!avail && !MLXBF_I2C_SLAVE_ADDR_ENABLED(addr_tmp)) {
- avail = true;
- reg_avail = reg;
- byte_avail = byte;
- slave_reg_avail = slave_reg;
- }
-
- /*
- * Parse slave address bytes and check whether the
- * slave address already exists and it's enabled,
- * i.e. most significant bit is set.
- */
- if ((addr_tmp & slave_addr_mask) == addr) {
- if (MLXBF_I2C_SLAVE_ADDR_ENABLED(addr_tmp))
- return 0;
- disabled = true;
- break;
+ if (!(addr_tmp & MLXBF_I2C_SMBUS_SLAVE_ADDR_EN_BIT)) {
+ 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->slv->io +
+ MLXBF_I2C_SMBUS_SLAVE_ADDR_CFG +
+ (reg * 0x4));
+
+ /*
+ * Set the slave at the corresponding index.
+ */
+ priv->slave[(reg * 4) + byte] = slave;
+
+ return 0;
}
/* Parse next byte. */
slave_reg_tmp >>= 8;
}
-
- /* Exit the loop if the slave address is found. */
- if (disabled)
- break;
- }
-
- if (!avail && !disabled)
- return -EINVAL; /* No room for a new slave address. */
-
- if (avail && !disabled) {
- reg = reg_avail;
- byte = byte_avail;
- /* Set the slave address. */
- slave_reg_avail &= ~(slave_addr_mask << (byte * 8));
- slave_reg_avail |= addr << (byte * 8);
- slave_reg = slave_reg_avail;
}
- /* Enable the slave address and update the register. */
- slave_reg |= (1 << MLXBF_I2C_SMBUS_SLAVE_ADDR_EN_BIT) << (byte * 8);
- writel(slave_reg, priv->smbus->io + MLXBF_I2C_SMBUS_SLAVE_ADDR_CFG +
- reg * 0x4);
-
- return 0;
+ return -EBUSY;
}
- static int mlxbf_slave_disable(struct mlxbf_i2c_priv *priv)
+ static int mlxbf_i2c_slave_disable(struct mlxbf_i2c_priv *priv, u8 addr)
{
- u32 slave_reg, slave_reg_tmp, slave_addr_mask;
- u8 addr, addr_tmp, reg, reg_cnt, slave_byte;
- struct i2c_client *client = priv->slave;
- bool exist;
-
- exist = false;
+ u8 addr_tmp, reg, reg_cnt, byte;
+ u32 slave_reg, slave_reg_tmp;
- addr = client->addr;
reg_cnt = MLXBF_I2C_SMBUS_SLAVE_ADDR_CNT >> 2;
- slave_addr_mask = MLXBF_I2C_SMBUS_SLAVE_ADDR_MASK;
/*
* Read the slave registers. There are 4 * 32-bit slave registers.
- * Each slave register can hold up to 4 * 8-bit slave configuration
- * (7-bit address, 1 status bit (1 if enabled, 0 if not)).
+ * Each slave register can hold up to 4 * 8-bit slave configuration:
+ * 1) A 7-bit address
+ * 2) And a status bit (1 if enabled, 0 if not).
+ * 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. */
- if (slave_reg == 0)
+ if (!slave_reg)
continue;
/*
- * Each register holds 4 slave addresses. So, we have to keep
- * the byte order consistent with the value read in order to
- * update the register correctly, if needed.
+ * Check if addr matches any of the 4 slave addresses
+ * in the register.
*/
slave_reg_tmp = slave_reg;
- slave_byte = 0;
- while (slave_reg_tmp != 0) {
- addr_tmp = slave_reg_tmp & slave_addr_mask;
+ for (byte = 0; byte < 4; byte++) {
+ addr_tmp = slave_reg_tmp & MLXBF_I2C_SMBUS_SLAVE_ADDR_MASK;
/*
* Parse slave address bytes and check whether the
* slave address already exists.
*/
if (addr_tmp == addr) {
- exist = true;
- break;
+ /* Clear the slave address slot. */
+ slave_reg &= ~(GENMASK(7, 0) << (byte * 8));
+ writel(slave_reg, priv->slv->io +
+ MLXBF_I2C_SMBUS_SLAVE_ADDR_CFG +
+ (reg * 0x4));
+ /* Free slave at the corresponding index */
+ priv->slave[(reg * 4) + byte] = NULL;
+
+ return 0;
}
/* Parse next byte. */
slave_reg_tmp >>= 8;
- slave_byte += 1;
}
-
- /* Exit the loop if the slave address is found. */
- if (exist)
- break;
}
- if (!exist)
- return 0; /* Slave is not registered, nothing to do. */
-
- /* Cleanup the slave address slot. */
- slave_reg &= ~(GENMASK(7, 0) << (slave_byte * 8));
- writel(slave_reg, priv->smbus->io + MLXBF_I2C_SMBUS_SLAVE_ADDR_CFG +
- reg * 0x4);
-
- return 0;
+ return -ENXIO;
}
static int mlxbf_i2c_init_coalesce(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
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);
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;
}
- /* Send byte to 'external' smbus master. */
- static int mlxbf_smbus_irq_send(struct mlxbf_i2c_priv *priv, u8 recv_bytes)
+ static struct i2c_client *mlxbf_i2c_get_slave_from_addr(
+ struct mlxbf_i2c_priv *priv, u8 addr)
{
- u8 data_desc[MLXBF_I2C_SLAVE_DATA_DESC_SIZE] = { 0 };
- u8 write_size, pec_en, addr, byte, value, byte_cnt, desc_size;
- struct i2c_client *slave = priv->slave;
- u32 control32, data32;
- int ret;
+ int i;
- if (!slave)
- return -EINVAL;
+ for (i = 0; i < MLXBF_I2C_SMBUS_SLAVE_ADDR_CNT; i++) {
+ if (!priv->slave[i])
+ continue;
- addr = 0;
- byte = 0;
- desc_size = MLXBF_I2C_SLAVE_DATA_DESC_SIZE;
+ if (priv->slave[i]->addr == addr)
+ return priv->slave[i];
+ }
+
+ return NULL;
+ }
+
+ /*
+ * Send byte to 'external' smbus master. This function is executed when
+ * an external smbus master wants to read data from the BlueField.
+ */
+ static int mlxbf_i2c_irq_send(struct mlxbf_i2c_priv *priv, u8 recv_bytes)
+ {
+ u8 data_desc[MLXBF_I2C_SLAVE_DATA_DESC_SIZE] = { 0 };
+ u8 write_size, pec_en, addr, value, byte_cnt;
+ struct i2c_client *slave;
+ u32 control32, data32;
+ int ret = 0;
/*
- * Read bytes received from the external master. These bytes should
- * be located in the first data descriptor register of the slave GW.
- * These bytes are the slave address byte and the internal register
- * address, if supplied.
+ * Read the first byte received from the external master to
+ * determine the slave address. This byte is located in the
+ * first data descriptor register of the slave GW.
*/
- if (recv_bytes > 0) {
- data32 = ioread32be(priv->smbus->io +
- MLXBF_I2C_SLAVE_DATA_DESC_ADDR);
-
- /* Parse the received bytes. */
- switch (recv_bytes) {
- case 2:
- byte = (data32 >> 8) & GENMASK(7, 0);
- fallthrough;
- case 1:
- addr = (data32 & GENMASK(7, 0)) >> 1;
- }
+ data32 = ioread32be(priv->slv->io +
+ MLXBF_I2C_SLAVE_DATA_DESC_ADDR);
+ addr = (data32 & GENMASK(7, 0)) >> 1;
- /* Check whether it's our slave address. */
- if (slave->addr != addr)
- return -EINVAL;
+ /*
+ * Check if the slave address received in the data descriptor register
+ * matches any of the slave addresses registered. If there is a match,
+ * set the slave.
+ */
+ slave = mlxbf_i2c_get_slave_from_addr(priv, addr);
+ if (!slave) {
+ ret = -ENXIO;
+ goto clear_csr;
}
/*
- * I2C read transactions may start by a WRITE followed by a READ.
- * Indeed, most slave devices would expect the internal address
- * following the slave address byte. So, write that byte first,
- * and then, send the requested data bytes to the master.
+ * An I2C read can consist of a WRITE bit transaction followed by
+ * a READ bit transaction. Indeed, slave devices often expect
+ * the slave address to be followed by the internal address.
+ * So, write the internal address byte first, and then, send the
+ * requested data to the master.
*/
if (recv_bytes > 1) {
i2c_slave_event(slave, I2C_SLAVE_WRITE_REQUESTED, &value);
- value = byte;
+ value = (data32 >> 8) & GENMASK(7, 0);
ret = i2c_slave_event(slave, I2C_SLAVE_WRITE_RECEIVED,
&value);
i2c_slave_event(slave, I2C_SLAVE_STOP, &value);
if (ret < 0)
- return ret;
+ goto clear_csr;
}
/*
- * Now, send data to the master; currently, the driver supports
- * READ_BYTE, READ_WORD and BLOCK READ protocols. Note that the
- * hardware can send up to 128 bytes per transfer. That is the
- * size of its data registers.
+ * Send data to the master. Currently, the driver supports
+ * READ_BYTE, READ_WORD and BLOCK READ protocols. The
+ * hardware can send up to 128 bytes per transfer which is
+ * the total size of the data registers.
*/
i2c_slave_event(slave, I2C_SLAVE_READ_REQUESTED, &value);
- for (byte_cnt = 0; byte_cnt < desc_size; byte_cnt++) {
+ for (byte_cnt = 0; byte_cnt < MLXBF_I2C_SLAVE_DATA_DESC_SIZE; byte_cnt++) {
data_desc[byte_cnt] = value;
i2c_slave_event(slave, I2C_SLAVE_READ_PROCESSED, &value);
}
/* Send a stop condition to the backend. */
i2c_slave_event(slave, I2C_SLAVE_STOP, &value);
- /* Handle the actual transfer. */
-
/* Set the number of bytes to write to master. */
write_size = (byte_cnt - 1) & 0x7f;
/* 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. */
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 0;
+ return ret;
}
- /* Receive bytes from 'external' smbus master. */
- static int mlxbf_smbus_irq_recv(struct mlxbf_i2c_priv *priv, u8 recv_bytes)
+ /*
+ * Receive bytes from 'external' smbus master. This function is executed when
+ * an external smbus master wants to write data to the BlueField.
+ */
+ static int mlxbf_i2c_irq_recv(struct mlxbf_i2c_priv *priv, u8 recv_bytes)
{
u8 data_desc[MLXBF_I2C_SLAVE_DATA_DESC_SIZE] = { 0 };
- struct i2c_client *slave = priv->slave;
+ struct i2c_client *slave;
u8 value, byte, addr;
int ret = 0;
- if (!slave)
- return -EINVAL;
-
/* Read data from Slave GW data descriptor. */
mlxbf_i2c_smbus_read_data(priv, data_desc, recv_bytes,
- MLXBF_I2C_SLAVE_DATA_DESC_ADDR);
-
- /* Check whether its our slave address. */
+ MLXBF_I2C_SLAVE_DATA_DESC_ADDR, false);
addr = data_desc[0] >> 1;
- if (slave->addr != addr)
- return -EINVAL;
/*
- * Notify the slave backend; another I2C master wants to write data
- * to us. This event is sent once the slave address and the write bit
- * is detected.
+ * Check if the slave address received in the data descriptor register
+ * matches any of the slave addresses registered.
+ */
+ slave = mlxbf_i2c_get_slave_from_addr(priv, addr);
+ if (!slave) {
+ ret = -EINVAL;
+ goto clear_csr;
+ }
+
+ /*
+ * Notify the slave backend that an smbus master wants to write data
+ * to the BlueField.
*/
i2c_slave_event(slave, I2C_SLAVE_WRITE_REQUESTED, &value);
break;
}
- /* Send a stop condition to the backend. */
+ /*
+ * Send a stop event to the slave backend, to signal
+ * the end of the write transactions.
+ */
i2c_slave_event(slave, I2C_SLAVE_STOP, &value);
+ 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;
}
- static irqreturn_t mlxbf_smbus_irq(int irq, void *ptr)
+ static irqreturn_t mlxbf_i2c_irq(int irq, void *ptr)
{
struct mlxbf_i2c_priv *priv = ptr;
bool read, write, irq_is_set;
* 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);
MLXBF_I2C_SLAVE_DATA_DESC_SIZE : recv_bytes;
if (read)
- mlxbf_smbus_irq_send(priv, recv_bytes);
+ mlxbf_i2c_irq_send(priv, recv_bytes);
else
- mlxbf_smbus_irq_recv(priv, recv_bytes);
+ mlxbf_i2c_irq_recv(priv, recv_bytes);
return IRQ_HANDLED;
}
static int mlxbf_i2c_reg_slave(struct i2c_client *slave)
{
struct mlxbf_i2c_priv *priv = i2c_get_adapdata(slave->adapter);
+ struct device *dev = &slave->dev;
int ret;
- if (priv->slave)
- return -EBUSY;
-
/*
* Do not support ten bit chip address and do not use Packet Error
* Checking (PEC).
*/
- if (slave->flags & (I2C_CLIENT_TEN | I2C_CLIENT_PEC))
+ if (slave->flags & (I2C_CLIENT_TEN | I2C_CLIENT_PEC)) {
+ dev_err(dev, "SMBus PEC and 10 bit address not supported\n");
return -EAFNOSUPPORT;
+ }
- ret = mlxbf_slave_enable(priv, slave->addr);
- if (ret < 0)
- return ret;
-
- priv->slave = slave;
+ ret = mlxbf_i2c_slave_enable(priv, slave);
+ if (ret)
+ dev_err(dev, "Surpassed max number of registered slaves allowed\n");
return 0;
}
static int mlxbf_i2c_unreg_slave(struct i2c_client *slave)
{
struct mlxbf_i2c_priv *priv = i2c_get_adapdata(slave->adapter);
+ struct device *dev = &slave->dev;
int ret;
- WARN_ON(!priv->slave);
-
- /* Unregister slave, i.e. disable the slave address in hardware. */
- ret = mlxbf_slave_disable(priv);
- if (ret < 0)
- return ret;
-
- priv->slave = NULL;
+ /*
+ * Unregister slave by:
+ * 1) Disabling the slave address in hardware
+ * 2) Freeing priv->slave at the corresponding index
+ */
+ ret = mlxbf_i2c_slave_disable(priv, slave->addr);
+ if (ret)
+ dev_err(dev, "Unable to find slave 0x%x\n", slave->addr);
- return 0;
+ return ret;
}
static u32 mlxbf_i2c_functionality(struct i2c_adapter *adap)
[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
}
};
.max_write_len = MLXBF_I2C_MASTER_DATA_W_LENGTH,
};
- static const struct of_device_id mlxbf_i2c_dt_ids[] = {
- {
- .compatible = "mellanox,i2c-mlxbf1",
- .data = &mlxbf_i2c_chip[MLXBF_I2C_CHIP_TYPE_1]
- },
- {
- .compatible = "mellanox,i2c-mlxbf2",
- .data = &mlxbf_i2c_chip[MLXBF_I2C_CHIP_TYPE_2]
- },
- {},
- };
-
- MODULE_DEVICE_TABLE(of, mlxbf_i2c_dt_ids);
-
#ifdef CONFIG_ACPI
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] },
{},
};
static int mlxbf_i2c_acpi_probe(struct device *dev, struct mlxbf_i2c_priv *priv)
{
const struct acpi_device_id *aid;
- struct acpi_device *adev;
- unsigned long bus_id = 0;
- const char *uid;
+ u64 bus_id;
int ret;
if (acpi_disabled)
return -ENOENT;
- adev = ACPI_COMPANION(dev);
- if (!adev)
- return -ENXIO;
-
aid = acpi_match_device(mlxbf_i2c_acpi_ids, dev);
if (!aid)
return -ENODEV;
priv->chip = (struct mlxbf_i2c_chip_info *)aid->driver_data;
- uid = acpi_device_uid(adev);
- if (!uid || !(*uid)) {
+ ret = acpi_dev_uid_to_integer(ACPI_COMPANION(dev), &bus_id);
+ if (ret) {
dev_err(dev, "Cannot retrieve UID\n");
- return -ENODEV;
+ return ret;
}
- ret = kstrtoul(uid, 0, &bus_id);
- if (!ret)
- priv->bus = bus_id;
+ priv->bus = bus_id;
- return ret;
+ return 0;
}
#else
static int mlxbf_i2c_acpi_probe(struct device *dev, struct mlxbf_i2c_priv *priv)
}
#endif /* CONFIG_ACPI */
- static int mlxbf_i2c_of_probe(struct device *dev, struct mlxbf_i2c_priv *priv)
- {
- const struct of_device_id *oid;
- int bus_id = -1;
-
- if (IS_ENABLED(CONFIG_OF) && dev->of_node) {
- oid = of_match_node(mlxbf_i2c_dt_ids, dev->of_node);
- if (!oid)
- return -ENODEV;
-
- priv->chip = oid->data;
-
- bus_id = of_alias_get_id(dev->of_node, "i2c");
- if (bus_id >= 0)
- priv->bus = bus_id;
- }
-
- if (bus_id < 0) {
- dev_err(dev, "Cannot get bus id");
- return bus_id;
- }
-
- return 0;
- }
-
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);
return -ENOMEM;
ret = mlxbf_i2c_acpi_probe(dev, priv);
- if (ret < 0 && ret != -ENOENT && ret != -ENXIO)
- ret = mlxbf_i2c_of_probe(dev, priv);
-
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 tables.
+ * 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);
+ if (ret < 0) {
+ dev_err(dev, "Cannot fetch smbus resource info");
+ return ret;
+ }
+
+ 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,
irq = platform_get_irq(pdev, 0);
if (irq < 0)
return irq;
- ret = devm_request_irq(dev, irq, mlxbf_smbus_irq,
- IRQF_ONESHOT | IRQF_SHARED | IRQF_PROBE_SHARED,
+ ret = devm_request_irq(dev, irq, mlxbf_i2c_irq,
+ IRQF_SHARED | IRQF_PROBE_SHARED,
dev_name(dev), priv);
if (ret < 0) {
dev_err(dev, "Cannot get irq %d\n", irq);
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));
.remove = mlxbf_i2c_remove,
.driver = {
.name = "i2c-mlxbf",
- .of_match_table = mlxbf_i2c_dt_ids,
#ifdef CONFIG_ACPI
.acpi_match_table = ACPI_PTR(mlxbf_i2c_acpi_ids),
#endif /* CONFIG_ACPI */
MODULE_DESCRIPTION("Mellanox BlueField I2C bus driver");
MODULE_LICENSE("GPL v2");
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