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31 ******************************************************************************/
32 /*****************************************************************************/
36 * @addtogroup iicps_v3_0
39 * This header file contains the hardware definition for an IIC device.
40 * It includes register definitions and interface functions to read/write
44 * MODIFICATION HISTORY:
46 * Ver Who Date Changes
47 * ----- ------ -------- -----------------------------------------------
48 * 1.00a drg/jz 01/30/10 First release
49 * 1.04a kpc 11/07/13 Added function prototype.
50 * 3.0 sk 11/03/14 Modified the TimeOut Register value to 0xFF
51 * 01/31/15 Modified the code according to MISRAC 2012 Compliant.
54 ******************************************************************************/
55 #ifndef XIICPS_HW_H /* prevent circular inclusions */
56 #define XIICPS_HW_H /* by using protection macros */
62 /***************************** Include Files *********************************/
64 #include "xil_types.h"
65 #include "xil_assert.h"
68 /************************** Constant Definitions *****************************/
70 /** @name Register Map
72 * Register offsets for the IIC.
75 #define XIICPS_CR_OFFSET 0x00U /**< 32-bit Control */
76 #define XIICPS_SR_OFFSET 0x04U /**< Status */
77 #define XIICPS_ADDR_OFFSET 0x08U /**< IIC Address */
78 #define XIICPS_DATA_OFFSET 0x0CU /**< IIC FIFO Data */
79 #define XIICPS_ISR_OFFSET 0x10U /**< Interrupt Status */
80 #define XIICPS_TRANS_SIZE_OFFSET 0x14U /**< Transfer Size */
81 #define XIICPS_SLV_PAUSE_OFFSET 0x18U /**< Slave monitor pause */
82 #define XIICPS_TIME_OUT_OFFSET 0x1CU /**< Time Out */
83 #define XIICPS_IMR_OFFSET 0x20U /**< Interrupt Enabled Mask */
84 #define XIICPS_IER_OFFSET 0x24U /**< Interrupt Enable */
85 #define XIICPS_IDR_OFFSET 0x28U /**< Interrupt Disable */
88 /** @name Control Register
90 * This register contains various control bits that
91 * affects the operation of the IIC controller. Read/Write.
95 #define XIICPS_CR_DIV_A_MASK 0x0000C000U /**< Clock Divisor A */
96 #define XIICPS_CR_DIV_A_SHIFT 14U /**< Clock Divisor A shift */
97 #define XIICPS_DIV_A_MAX 4U /**< Maximum value of Divisor A */
98 #define XIICPS_CR_DIV_B_MASK 0x00003F00U /**< Clock Divisor B */
99 #define XIICPS_CR_DIV_B_SHIFT 8U /**< Clock Divisor B shift */
100 #define XIICPS_CR_CLR_FIFO_MASK 0x00000040U /**< Clear FIFO, auto clears*/
101 #define XIICPS_CR_SLVMON_MASK 0x00000020U /**< Slave monitor mode */
102 #define XIICPS_CR_HOLD_MASK 0x00000010U /**< Hold bus 1=Hold scl,
103 0=terminate transfer */
104 #define XIICPS_CR_ACKEN_MASK 0x00000008U /**< Enable TX of ACK when
106 #define XIICPS_CR_NEA_MASK 0x00000004U /**< Addressing Mode 1=7 bit,
108 #define XIICPS_CR_MS_MASK 0x00000002U /**< Master mode bit 1=Master,
110 #define XIICPS_CR_RD_WR_MASK 0x00000001U /**< Read or Write Master
111 transfer 0=Transmitter,
113 #define XIICPS_CR_RESET_VALUE 0U /**< Reset value of the Control
117 /** @name IIC Status Register
119 * This register is used to indicate status of the IIC controller. Read only
122 #define XIICPS_SR_BA_MASK 0x00000100U /**< Bus Active Mask */
123 #define XIICPS_SR_RXOVF_MASK 0x00000080U /**< Receiver Overflow Mask */
124 #define XIICPS_SR_TXDV_MASK 0x00000040U /**< Transmit Data Valid Mask */
125 #define XIICPS_SR_RXDV_MASK 0x00000020U /**< Receiver Data Valid Mask */
126 #define XIICPS_SR_RXRW_MASK 0x00000008U /**< Receive read/write Mask */
129 /** @name IIC Address Register
131 * Normal addressing mode uses add[6:0]. Extended addressing mode uses add[9:0].
132 * A write access to this register always initiates a transfer if the IIC is in
133 * master mode. Read/Write
136 #define XIICPS_ADDR_MASK 0x000003FF /**< IIC Address Mask */
139 /** @name IIC Data Register
141 * When written to, the data register sets data to transmit. When read from, the
142 * data register reads the last received byte of data. Read/Write
145 #define XIICPS_DATA_MASK 0x000000FF /**< IIC Data Mask */
148 /** @name IIC Interrupt Registers
150 * <b>IIC Interrupt Status Register</b>
152 * This register holds the interrupt status flags for the IIC controller. Some
153 * of the flags are level triggered
154 * - i.e. are set as long as the interrupt condition exists. Other flags are
155 * edge triggered, which means they are set one the interrupt condition occurs
156 * then remain set until they are cleared by software.
157 * The interrupts are cleared by writing a one to the interrupt bit position
158 * in the Interrupt Status Register. Read/Write.
160 * <b>IIC Interrupt Enable Register</b>
162 * This register is used to enable interrupt sources for the IIC controller.
163 * Writing a '1' to a bit in this register clears the corresponding bit in the
164 * IIC Interrupt Mask register. Write only.
166 * <b>IIC Interrupt Disable Register </b>
168 * This register is used to disable interrupt sources for the IIC controller.
169 * Writing a '1' to a bit in this register sets the corresponding bit in the
170 * IIC Interrupt Mask register. Write only.
172 * <b>IIC Interrupt Mask Register</b>
174 * This register shows the enabled/disabled status of each IIC controller
175 * interrupt source. A bit set to 1 will ignore the corresponding interrupt in
176 * the status register. A bit set to 0 means the interrupt is enabled.
177 * All mask bits are set and all interrupts are disabled after reset. Read only.
179 * All four registers have the same bit definitions. They are only defined once
180 * for each of the Interrupt Enable Register, Interrupt Disable Register,
181 * Interrupt Mask Register, and Interrupt Status Register
185 #define XIICPS_IXR_ARB_LOST_MASK 0x00000200U /**< Arbitration Lost Interrupt
187 #define XIICPS_IXR_RX_UNF_MASK 0x00000080U /**< FIFO Recieve Underflow
189 #define XIICPS_IXR_TX_OVR_MASK 0x00000040U /**< Transmit Overflow
191 #define XIICPS_IXR_RX_OVR_MASK 0x00000020U /**< Receive Overflow Interrupt
193 #define XIICPS_IXR_SLV_RDY_MASK 0x00000010U /**< Monitored Slave Ready
195 #define XIICPS_IXR_TO_MASK 0x00000008U /**< Transfer Time Out
197 #define XIICPS_IXR_NACK_MASK 0x00000004U /**< NACK Interrupt mask */
198 #define XIICPS_IXR_DATA_MASK 0x00000002U /**< Data Interrupt mask */
199 #define XIICPS_IXR_COMP_MASK 0x00000001U /**< Transfer Complete
201 #define XIICPS_IXR_DEFAULT_MASK 0x000002FFU /**< Default ISR Mask */
202 #define XIICPS_IXR_ALL_INTR_MASK 0x000002FFU /**< All ISR Mask */
206 /** @name IIC Transfer Size Register
208 * The register's meaning varies according to the operating mode as follows:
209 * - Master transmitter mode: number of data bytes still not transmitted minus
211 * - Master receiver mode: number of data bytes that are still expected to be
213 * - Slave transmitter mode: number of bytes remaining in the FIFO after the
214 * master terminates the transfer
215 * - Slave receiver mode: number of valid data bytes in the FIFO
217 * This register is cleared if CLR_FIFO bit in the control register is set.
221 #define XIICPS_TRANS_SIZE_MASK 0x0000003F /**< IIC Transfer Size Mask */
222 #define XIICPS_FIFO_DEPTH 16 /**< Number of bytes in the FIFO */
223 #define XIICPS_DATA_INTR_DEPTH 14 /**< Number of bytes at DATA intr */
227 /** @name IIC Slave Monitor Pause Register
229 * This register is associated with the slave monitor mode of the I2C interface.
230 * It is meaningful only when the module is in master mode and bit SLVMON in the
231 * control register is set.
233 * This register defines the pause interval between consecutive attempts to
234 * address the slave once a write to an I2C address register is done by the
235 * host. It represents the number of sclk cycles minus one between two attempts.
237 * The reset value of the register is 0, which results in the master repeatedly
238 * trying to access the slave immediately after unsuccessful attempt.
242 #define XIICPS_SLV_PAUSE_MASK 0x0000000F /**< Slave monitor pause mask */
246 /** @name IIC Time Out Register
248 * The value of time out register represents the time out interval in number of
249 * sclk cycles minus one.
251 * When the accessed slave holds the sclk line low for longer than the time out
252 * period, thus prohibiting the I2C interface in master mode to complete the
253 * current transfer, an interrupt is generated and TO interrupt flag is set.
255 * The reset value of the register is 0x1f.
259 #define XIICPS_TIME_OUT_MASK 0x000000FFU /**< IIC Time Out mask */
260 #define XIICPS_TO_RESET_VALUE 0x000000FFU /**< IIC Time Out reset value */
263 /**************************** Type Definitions *******************************/
265 /***************** Macros (Inline Functions) Definitions *********************/
267 #define XIicPs_In32 Xil_In32
268 #define XIicPs_Out32 Xil_Out32
270 /****************************************************************************/
272 * Read an IIC register.
274 * @param BaseAddress contains the base address of the device.
275 * @param RegOffset contains the offset from the 1st register of the
276 * device to select the specific register.
278 * @return The value read from the register.
280 * @note C-Style signature:
281 * u32 XIicPs_ReadReg(u32 BaseAddress. int RegOffset)
283 ******************************************************************************/
284 #define XIicPs_ReadReg(BaseAddress, RegOffset) \
285 XIicPs_In32((BaseAddress) + (u32)(RegOffset))
287 /***************************************************************************/
289 * Write an IIC register.
291 * @param BaseAddress contains the base address of the device.
292 * @param RegOffset contains the offset from the 1st register of the
293 * device to select the specific register.
294 * @param RegisterValue is the value to be written to the register.
298 * @note C-Style signature:
299 * void XIicPs_WriteReg(u32 BaseAddress, int RegOffset, u32 RegisterValue)
301 ******************************************************************************/
302 #define XIicPs_WriteReg(BaseAddress, RegOffset, RegisterValue) \
303 XIicPs_Out32((BaseAddress) + (u32)(RegOffset), (u32)(RegisterValue))
305 /***************************************************************************/
307 * Read the interrupt enable register.
309 * @param BaseAddress contains the base address of the device.
311 * @return Current bit mask that represents currently enabled interrupts.
313 * @note C-Style signature:
314 * u32 XIicPs_ReadIER(u32 BaseAddress)
316 ******************************************************************************/
317 #define XIicPs_ReadIER(BaseAddress) \
318 XIicPs_ReadReg((BaseAddress), XIICPS_IER_OFFSET)
320 /***************************************************************************/
322 * Write to the interrupt enable register.
324 * @param BaseAddress contains the base address of the device.
326 * @param IntrMask is the interrupts to be enabled.
330 * @note C-Style signature:
331 * void XIicPs_EnabledInterrupts(u32 BaseAddress, u32 IntrMask)
333 ******************************************************************************/
334 #define XIicPs_EnableInterrupts(BaseAddress, IntrMask) \
335 XIicPs_WriteReg((BaseAddress), XIICPS_IER_OFFSET, (IntrMask))
337 /***************************************************************************/
339 * Disable all interrupts.
341 * @param BaseAddress contains the base address of the device.
345 * @note C-Style signature:
346 * void XIicPs_DisableAllInterrupts(u32 BaseAddress)
348 ******************************************************************************/
349 #define XIicPs_DisableAllInterrupts(BaseAddress) \
350 XIicPs_WriteReg((BaseAddress), XIICPS_IDR_OFFSET, \
351 XIICPS_IXR_ALL_INTR_MASK)
353 /***************************************************************************/
355 * Disable selected interrupts.
357 * @param BaseAddress contains the base address of the device.
359 * @param IntrMask is the interrupts to be disabled.
363 * @note C-Style signature:
364 * void XIicPs_DisableInterrupts(u32 BaseAddress, u32 IntrMask)
366 ******************************************************************************/
367 #define XIicPs_DisableInterrupts(BaseAddress, IntrMask) \
368 XIicPs_WriteReg((BaseAddress), XIICPS_IDR_OFFSET, \
371 /************************** Variable Definitions *****************************/
373 /************************** Function Prototypes ******************************/
375 * Perform reset operation to the I2c interface
377 void XIicPs_ResetHw(u32 BaseAddress);
382 #endif /* end of protection macro */