[PATCH v3 3/5] i2c: designware: Add slave definitions
From: Luis Oliveira
Date: Fri Nov 18 2016 - 06:21:13 EST
- Add slave defintitions to i2c-designware-core
- Changes in Kconfig to auto-enable I2C_SLAVE when compiling the modules
- Add compatible string to designware-core.txt explaining the devicetree bindings
Signed-off-by: Luis Oliveira <lolivei@xxxxxxxxxxxx>
---
Changes V2->V3: (Andy Shevchenko)
- necessary definitions added to i2c-designware-core.h (slave)
- code will be added in the next patch as suggested
- compatible string for slave enabling as suggested
.../devicetree/bindings/i2c/i2c-designware.txt | 4 +++-
drivers/i2c/busses/Kconfig | 1 +
drivers/i2c/busses/i2c-designware-core.h | 24 ++++++++++++++++++++++
drivers/i2c/busses/i2c-designware-src.c | 6 ++++++
4 files changed, 34 insertions(+), 1 deletion(-)
diff --git a/Documentation/devicetree/bindings/i2c/i2c-designware.txt b/Documentation/devicetree/bindings/i2c/i2c-designware.txt
index fee26dc..7705434 100644
--- a/Documentation/devicetree/bindings/i2c/i2c-designware.txt
+++ b/Documentation/devicetree/bindings/i2c/i2c-designware.txt
@@ -2,7 +2,9 @@
Required properties :
- - compatible : should be "snps,designware-i2c"
+ - compatible : should be:
+ - "snps,designware-i2c" to setup the hardware block as I2C master.
+ - "snps,designware-i2c-slave" to setup the hardware block as I2C slave.
- reg : Offset and length of the register set for the device
- interrupts : <IRQ> where IRQ is the interrupt number.
diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
index d252276..0de8e30 100644
--- a/drivers/i2c/busses/Kconfig
+++ b/drivers/i2c/busses/Kconfig
@@ -470,6 +470,7 @@ config I2C_DESIGNWARE_CORE
config I2C_DESIGNWARE_PLATFORM
tristate "Synopsys DesignWare Platform"
select I2C_DESIGNWARE_CORE
+ select I2C_SLAVE
depends on (ACPI && COMMON_CLK) || !ACPI
help
If you say yes to this option, support will be included for the
diff --git a/drivers/i2c/busses/i2c-designware-core.h b/drivers/i2c/busses/i2c-designware-core.h
index 1d45667..8c33324 100644
--- a/drivers/i2c/busses/i2c-designware-core.h
+++ b/drivers/i2c/busses/i2c-designware-core.h
@@ -26,15 +26,20 @@
#define DW_IC_CON_SPEED_FAST 0x4
#define DW_IC_CON_SPEED_HIGH 0x6
#define DW_IC_CON_SPEED_MASK 0x6
+#define DW_IC_CON_10BITADDR_SLAVE 0x8
#define DW_IC_CON_10BITADDR_MASTER 0x10
#define DW_IC_CON_RESTART_EN 0x20
#define DW_IC_CON_SLAVE_DISABLE 0x40
+#define DW_IC_CON_STOP_DET_IFADDRESSED 0x80
+#define DW_IC_CON_TX_EMPTY_CTRL 0x100
+#define DW_IC_CON_RX_FIFO_FULL_HLD_CTRL 0x200
/*
* Registers offset
*/
#define DW_IC_CON 0x0
#define DW_IC_TAR 0x4
+#define DW_IC_SAR 0x8
#define DW_IC_DATA_CMD 0x10
#define DW_IC_SS_SCL_HCNT 0x14
#define DW_IC_SS_SCL_LCNT 0x18
@@ -89,9 +94,15 @@
DW_IC_INTR_STOP_DET)
#define DW_IC_INTR_MASTER_MASK (DW_IC_INTR_DEFAULT_MASK | \
DW_IC_INTR_TX_EMPTY)
+#define DW_IC_INTR_SLAVE_MASK (DW_IC_INTR_DEFAULT_MASK | \
+ DW_IC_INTR_RX_DONE | \
+ DW_IC_INTR_RX_UNDER | \
+ DW_IC_INTR_RD_REQ)
+
#define DW_IC_STATUS_ACTIVITY 0x1
#define DW_IC_STATUS_TFE BIT(2)
#define DW_IC_STATUS_MASTER_ACTIVITY BIT(5)
+#define DW_IC_STATUS_SLAVE_ACTIVITY BIT(6)
#define DW_IC_SDA_HOLD_RX_SHIFT 16
#define DW_IC_SDA_HOLD_RX_MASK GENMASK(23, DW_IC_SDA_HOLD_RX_SHIFT)
@@ -129,6 +140,9 @@
#define ABRT_10B_RD_NORSTRT 10
#define ABRT_MASTER_DIS 11
#define ARB_LOST 12
+#define ABRT_SLAVE_FLUSH_TXFIFO 13
+#define ABRT_SLAVE_ARBLOST 14
+#define ABRT_SLAVE_RD_INTX 15
#define DW_IC_TX_ABRT_7B_ADDR_NOACK (1UL << ABRT_7B_ADDR_NOACK)
#define DW_IC_TX_ABRT_10ADDR1_NOACK (1UL << ABRT_10ADDR1_NOACK)
@@ -141,6 +155,9 @@
#define DW_IC_TX_ABRT_10B_RD_NORSTRT (1UL << ABRT_10B_RD_NORSTRT)
#define DW_IC_TX_ABRT_MASTER_DIS (1UL << ABRT_MASTER_DIS)
#define DW_IC_TX_ARB_LOST (1UL << ARB_LOST)
+#define DW_IC_RX_ABRT_SLAVE_RD_INTX (1UL << ABRT_SLAVE_RD_INTX)
+#define DW_IC_RX_ABRT_SLAVE_ARBLOST (1UL << ABRT_SLAVE_ARBLOST)
+#define DW_IC_RX_ABRT_SLAVE_FLUSH_TXFIFO (1UL << ABRT_SLAVE_FLUSH_TXFIFO)
#define DW_IC_TX_ABRT_NOACK (DW_IC_TX_ABRT_7B_ADDR_NOACK | \
DW_IC_TX_ABRT_10ADDR1_NOACK | \
@@ -195,6 +212,7 @@ struct dw_i2c_dev {
void __iomem *base;
struct completion cmd_complete;
struct clk *clk;
+ struct i2c_client *slave;
u32 (*get_clk_rate_khz) (struct dw_i2c_dev *dev);
struct dw_pci_controller *controller;
int cmd_err;
@@ -214,6 +232,7 @@ struct dw_i2c_dev {
struct i2c_adapter adapter;
u32 functionality;
u32 master_cfg;
+ u32 slave_cfg;
unsigned int tx_fifo_depth;
unsigned int rx_fifo_depth;
int rx_outstanding;
@@ -257,6 +276,11 @@ extern void i2c_dw_disable(struct dw_i2c_dev *dev);
extern void i2c_dw_disable_int(struct dw_i2c_dev *dev);
extern u32 i2c_dw_read_comp_param(struct dw_i2c_dev *dev);
extern int i2c_dw_probe(struct dw_i2c_dev *dev);
+extern int i2c_dw_init_slave(struct dw_i2c_dev *dev);
+extern void i2c_dw_disable_slave(struct dw_i2c_dev *dev);
+extern void i2c_dw_disable_int_slave(struct dw_i2c_dev *dev);
+extern u32 i2c_dw_read_comp_param_slave(struct dw_i2c_dev *dev);
+extern int i2c_dw_probe_slave(struct dw_i2c_dev *dev);
#if IS_ENABLED(CONFIG_I2C_DESIGNWARE_BAYTRAIL)
extern int i2c_dw_eval_lock_support(struct dw_i2c_dev *dev);
diff --git a/drivers/i2c/busses/i2c-designware-src.c b/drivers/i2c/busses/i2c-designware-src.c
index 4ec0045..838ef66 100644
--- a/drivers/i2c/busses/i2c-designware-src.c
+++ b/drivers/i2c/busses/i2c-designware-src.c
@@ -55,6 +55,12 @@ static char *abort_sources[] = {
"trying to use disabled adapter",
[ARB_LOST] =
"lost arbitration",
+ [ABRT_SLAVE_FLUSH_TXFIFO] =
+ "read command so flush old data in the TX FIFO",
+ [ABRT_SLAVE_ARBLOST] =
+ "slave lost the bus while transmitting data to a remote master",
+ [ABRT_SLAVE_RD_INTX] =
+ "slave request for data to be transmitted and",
};
u32 dw_readl(struct dw_i2c_dev *dev, int offset)
--
2.10.2