1 /******************************************************************************
3 * Copyright (C) 2010 - 2014 Xilinx, Inc. All rights reserved.
5 * Permission is hereby granted, free of charge, to any person obtaining a copy
6 * of this software and associated documentation files (the "Software"), to deal
7 * in the Software without restriction, including without limitation the rights
8 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
9 * copies of the Software, and to permit persons to whom the Software is
10 * furnished to do so, subject to the following conditions:
12 * The above copyright notice and this permission notice shall be included in
13 * all copies or substantial portions of the Software.
15 * Use of the Software is limited solely to applications:
16 * (a) running on a Xilinx device, or
17 * (b) that interact with a Xilinx device through a bus or interconnect.
19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
20 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
21 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
22 * XILINX BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
23 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
24 * OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
27 * Except as contained in this notice, the name of the Xilinx shall not be used
28 * in advertising or otherwise to promote the sale, use or other dealings in
29 * this Software without prior written authorization from Xilinx.
31 ******************************************************************************/
32 /*****************************************************************************/
37 * This header file contains the hardware definition for an IIC device.
38 * It includes register definitions and interface functions to read/write
42 * MODIFICATION HISTORY:
44 * Ver Who Date Changes
45 * ----- ------ -------- -----------------------------------------------
46 * 1.00a drg/jz 01/30/10 First release
47 * 1.04a kpc 11/07/13 Added function prototype.
50 ******************************************************************************/
51 #ifndef XIICPS_HW_H /* prevent circular inclusions */
52 #define XIICPS_HW_H /* by using protection macros */
58 /***************************** Include Files *********************************/
60 #include "xil_types.h"
61 #include "xil_assert.h"
64 /************************** Constant Definitions *****************************/
66 /** @name Register Map
68 * Register offsets for the IIC.
71 #define XIICPS_CR_OFFSET 0x00 /**< 32-bit Control */
72 #define XIICPS_SR_OFFSET 0x04 /**< Status */
73 #define XIICPS_ADDR_OFFSET 0x08 /**< IIC Address */
74 #define XIICPS_DATA_OFFSET 0x0C /**< IIC FIFO Data */
75 #define XIICPS_ISR_OFFSET 0x10 /**< Interrupt Status */
76 #define XIICPS_TRANS_SIZE_OFFSET 0x14 /**< Transfer Size */
77 #define XIICPS_SLV_PAUSE_OFFSET 0x18 /**< Slave monitor pause */
78 #define XIICPS_TIME_OUT_OFFSET 0x1C /**< Time Out */
79 #define XIICPS_IMR_OFFSET 0x20 /**< Interrupt Enabled Mask */
80 #define XIICPS_IER_OFFSET 0x24 /**< Interrupt Enable */
81 #define XIICPS_IDR_OFFSET 0x28 /**< Interrupt Disable */
84 /** @name Control Register
86 * This register contains various control bits that
87 * affects the operation of the IIC controller. Read/Write.
91 #define XIICPS_CR_DIV_A_MASK 0x0000C000 /**< Clock Divisor A */
92 #define XIICPS_CR_DIV_A_SHIFT 14 /**< Clock Divisor A shift */
93 #define XIICPS_DIV_A_MAX 4 /**< Maximum value of Divisor A */
94 #define XIICPS_CR_DIV_B_MASK 0x00003F00 /**< Clock Divisor B */
95 #define XIICPS_CR_DIV_B_SHIFT 8 /**< Clock Divisor B shift */
96 #define XIICPS_CR_CLR_FIFO_MASK 0x00000040 /**< Clear FIFO, auto clears*/
97 #define XIICPS_CR_SLVMON_MASK 0x00000020 /**< Slave monitor mode */
98 #define XIICPS_CR_HOLD_MASK 0x00000010 /**< Hold bus 1=Hold scl,
99 0=terminate transfer */
100 #define XIICPS_CR_ACKEN_MASK 0x00000008 /**< Enable TX of ACK when
102 #define XIICPS_CR_NEA_MASK 0x00000004 /**< Addressing Mode 1=7 bit,
104 #define XIICPS_CR_MS_MASK 0x00000002 /**< Master mode bit 1=Master,
106 #define XIICPS_CR_RD_WR_MASK 0x00000001 /**< Read or Write Master
107 transfer 0=Transmitter,
109 #define XIICPS_CR_RESET_VALUE 0 /**< Reset value of the Control
113 /** @name IIC Status Register
115 * This register is used to indicate status of the IIC controller. Read only
118 #define XIICPS_SR_BA_MASK 0x00000100 /**< Bus Active Mask */
119 #define XIICPS_SR_RXOVF_MASK 0x00000080 /**< Receiver Overflow Mask */
120 #define XIICPS_SR_TXDV_MASK 0x00000040 /**< Transmit Data Valid Mask */
121 #define XIICPS_SR_RXDV_MASK 0x00000020 /**< Receiver Data Valid Mask */
122 #define XIICPS_SR_RXRW_MASK 0x00000008 /**< Receive read/write Mask */
125 /** @name IIC Address Register
127 * Normal addressing mode uses add[6:0]. Extended addressing mode uses add[9:0].
128 * A write access to this register always initiates a transfer if the IIC is in
129 * master mode. Read/Write
132 #define XIICPS_ADDR_MASK 0x000003FF /**< IIC Address Mask */
135 /** @name IIC Data Register
137 * When written to, the data register sets data to transmit. When read from, the
138 * data register reads the last received byte of data. Read/Write
141 #define XIICPS_DATA_MASK 0x000000FF /**< IIC Data Mask */
144 /** @name IIC Interrupt Registers
146 * <b>IIC Interrupt Status Register</b>
148 * This register holds the interrupt status flags for the IIC controller. Some
149 * of the flags are level triggered
150 * - i.e. are set as long as the interrupt condition exists. Other flags are
151 * edge triggered, which means they are set one the interrupt condition occurs
152 * then remain set until they are cleared by software.
153 * The interrupts are cleared by writing a one to the interrupt bit position
154 * in the Interrupt Status Register. Read/Write.
156 * <b>IIC Interrupt Enable Register</b>
158 * This register is used to enable interrupt sources for the IIC controller.
159 * Writing a '1' to a bit in this register clears the corresponding bit in the
160 * IIC Interrupt Mask register. Write only.
162 * <b>IIC Interrupt Disable Register </b>
164 * This register is used to disable interrupt sources for the IIC controller.
165 * Writing a '1' to a bit in this register sets the corresponding bit in the
166 * IIC Interrupt Mask register. Write only.
168 * <b>IIC Interrupt Mask Register</b>
170 * This register shows the enabled/disabled status of each IIC controller
171 * interrupt source. A bit set to 1 will ignore the corresponding interrupt in
172 * the status register. A bit set to 0 means the interrupt is enabled.
173 * All mask bits are set and all interrupts are disabled after reset. Read only.
175 * All four registers have the same bit definitions. They are only defined once
176 * for each of the Interrupt Enable Register, Interrupt Disable Register,
177 * Interrupt Mask Register, and Interrupt Status Register
181 #define XIICPS_IXR_ARB_LOST_MASK 0x00000200 /**< Arbitration Lost Interrupt
183 #define XIICPS_IXR_RX_UNF_MASK 0x00000080 /**< FIFO Recieve Underflow
185 #define XIICPS_IXR_TX_OVR_MASK 0x00000040 /**< Transmit Overflow
187 #define XIICPS_IXR_RX_OVR_MASK 0x00000020 /**< Receive Overflow Interrupt
189 #define XIICPS_IXR_SLV_RDY_MASK 0x00000010 /**< Monitored Slave Ready
191 #define XIICPS_IXR_TO_MASK 0x00000008 /**< Transfer Time Out
193 #define XIICPS_IXR_NACK_MASK 0x00000004 /**< NACK Interrupt mask */
194 #define XIICPS_IXR_DATA_MASK 0x00000002 /**< Data Interrupt mask */
195 #define XIICPS_IXR_COMP_MASK 0x00000001 /**< Transfer Complete
197 #define XIICPS_IXR_DEFAULT_MASK 0x000002FF /**< Default ISR Mask */
198 #define XIICPS_IXR_ALL_INTR_MASK 0x000002FF /**< All ISR Mask */
202 /** @name IIC Transfer Size Register
204 * The register's meaning varies according to the operating mode as follows:
205 * - Master transmitter mode: number of data bytes still not transmitted minus
207 * - Master receiver mode: number of data bytes that are still expected to be
209 * - Slave transmitter mode: number of bytes remaining in the FIFO after the
210 * master terminates the transfer
211 * - Slave receiver mode: number of valid data bytes in the FIFO
213 * This register is cleared if CLR_FIFO bit in the control register is set.
217 #define XIICPS_TRANS_SIZE_MASK 0x0000003F /**< IIC Transfer Size Mask */
218 #define XIICPS_FIFO_DEPTH 16 /**< Number of bytes in the FIFO */
219 #define XIICPS_DATA_INTR_DEPTH 14 /**< Number of bytes at DATA intr */
223 /** @name IIC Slave Monitor Pause Register
225 * This register is associated with the slave monitor mode of the I2C interface.
226 * It is meaningful only when the module is in master mode and bit SLVMON in the
227 * control register is set.
229 * This register defines the pause interval between consecutive attempts to
230 * address the slave once a write to an I2C address register is done by the
231 * host. It represents the number of sclk cycles minus one between two attempts.
233 * The reset value of the register is 0, which results in the master repeatedly
234 * trying to access the slave immediately after unsuccessful attempt.
238 #define XIICPS_SLV_PAUSE_MASK 0x0000000F /**< Slave monitor pause mask */
242 /** @name IIC Time Out Register
244 * The value of time out register represents the time out interval in number of
245 * sclk cycles minus one.
247 * When the accessed slave holds the sclk line low for longer than the time out
248 * period, thus prohibiting the I2C interface in master mode to complete the
249 * current transfer, an interrupt is generated and TO interrupt flag is set.
251 * The reset value of the register is 0x1f.
255 #define XIICPS_TIME_OUT_MASK 0x000000FF /**< IIC Time Out mask */
256 #define XIICPS_TO_RESET_VALUE 0x0000001F /**< IIC Time Out reset value */
259 /**************************** Type Definitions *******************************/
261 /***************** Macros (Inline Functions) Definitions *********************/
263 #define XIicPs_In32 Xil_In32
264 #define XIicPs_Out32 Xil_Out32
266 /****************************************************************************/
268 * Read an IIC register.
270 * @param BaseAddress contains the base address of the device.
271 * @param RegOffset contains the offset from the 1st register of the
272 * device to select the specific register.
274 * @return The value read from the register.
276 * @note C-Style signature:
277 * u32 XIicPs_ReadReg(u32 BaseAddress. int RegOffset)
279 ******************************************************************************/
280 #define XIicPs_ReadReg(BaseAddress, RegOffset) \
281 XIicPs_In32((BaseAddress) + (RegOffset))
283 /***************************************************************************/
285 * Write an IIC register.
287 * @param BaseAddress contains the base address of the device.
288 * @param RegOffset contains the offset from the 1st register of the
289 * device to select the specific register.
290 * @param RegisterValue is the value to be written to the register.
294 * @note C-Style signature:
295 * void XIicPs_WriteReg(u32 BaseAddress, int RegOffset, u32 RegisterValue)
297 ******************************************************************************/
298 #define XIicPs_WriteReg(BaseAddress, RegOffset, RegisterValue) \
299 XIicPs_Out32((BaseAddress) + (RegOffset), (RegisterValue))
301 /***************************************************************************/
303 * Read the interrupt enable register.
305 * @param BaseAddress contains the base address of the device.
307 * @return Current bit mask that represents currently enabled interrupts.
309 * @note C-Style signature:
310 * u32 XIicPs_ReadIER(u32 BaseAddress)
312 ******************************************************************************/
313 #define XIicPs_ReadIER(BaseAddress) \
314 XIicPs_ReadReg((BaseAddress), XIICPS_IER_OFFSET)
316 /***************************************************************************/
318 * Write to the interrupt enable register.
320 * @param BaseAddress contains the base address of the device.
322 * @param IntrMask is the interrupts to be enabled.
326 * @note C-Style signature:
327 * void XIicPs_EnabledInterrupts(u32 BaseAddress, u32 IntrMask)
329 ******************************************************************************/
330 #define XIicPs_EnableInterrupts(BaseAddress, IntrMask) \
331 XIicPs_WriteReg((BaseAddress), XIICPS_IER_OFFSET, (IntrMask))
333 /***************************************************************************/
335 * Disable all interrupts.
337 * @param BaseAddress contains the base address of the device.
341 * @note C-Style signature:
342 * void XIicPs_DisableAllInterrupts(u32 BaseAddress)
344 ******************************************************************************/
345 #define XIicPs_DisableAllInterrupts(BaseAddress) \
346 XIicPs_WriteReg((BaseAddress), XIICPS_IDR_OFFSET, \
347 XIICPS_IXR_ALL_INTR_MASK)
349 /***************************************************************************/
351 * Disable selected interrupts.
353 * @param BaseAddress contains the base address of the device.
355 * @param IntrMask is the interrupts to be disabled.
359 * @note C-Style signature:
360 * void XIicPs_DisableInterrupts(u32 BaseAddress, u32 IntrMask)
362 ******************************************************************************/
363 #define XIicPs_DisableInterrupts(BaseAddress, IntrMask) \
364 XIicPs_WriteReg((BaseAddress), XIICPS_IDR_OFFSET, \
367 /************************** Variable Definitions *****************************/
369 /************************** Function Prototypes ******************************/
371 * Perform reset operation to the I2c interface
373 void XIicPs_ResetHw(u32 BaseAddr);
378 #endif /* end of protection macro */