1 /******************************************************************************
3 * Copyright (C) 2009 - 2015 Xilinx, Inc. All rights reserved.
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6 * of this software and associated documentation files (the "Software"), to deal
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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
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29 * this Software without prior written authorization from Xilinx.
31 ******************************************************************************/
32 /*****************************************************************************/
37 * Contains I/O functions for memory-mapped or non-memory-mapped I/O
38 * architectures. These functions encapsulate Cortex A9 architecture-specific
43 * This file contains architecture-dependent code.
46 * MODIFICATION HISTORY:
48 * Ver Who Date Changes
49 * ----- -------- -------- -----------------------------------------------
50 * 1.00a ecm/sdm 10/24/09 First release
51 * 3.06a sgd 05/15/12 Pointer volatile used for the all read functions
52 * 3.07a sgd 08/17/12 Removed barriers (SYNCHRONIZE_IO) calls.
53 * 3.09a sgd 02/05/13 Comments cleanup
55 ******************************************************************************/
58 /***************************** Include Files *********************************/
60 #include "xil_types.h"
61 #include "xil_assert.h"
62 #include "xpseudo_asm.h"
63 #include "xreg_cortexa9.h"
65 /************************** Constant Definitions *****************************/
67 /**************************** Type Definitions *******************************/
69 /***************** Macros (Inline Functions) Definitions *********************/
71 /************************** Function Prototypes ******************************/
73 /*****************************************************************************/
76 * Performs an input operation for an 8-bit memory location by reading from the
77 * specified address and returning the Value read from that address.
79 * @param Addr contains the address to perform the input operation
82 * @return The Value read from the specified input address.
86 ******************************************************************************/
87 u8 Xil_In8(INTPTR Addr)
89 return *(volatile u8 *) Addr;
92 /*****************************************************************************/
95 * Performs an input operation for a 16-bit memory location by reading from the
96 * specified address and returning the Value read from that address.
98 * @param Addr contains the address to perform the input operation
101 * @return The Value read from the specified input address.
105 ******************************************************************************/
106 u16 Xil_In16(INTPTR Addr)
108 return *(volatile u16 *) Addr;
111 /*****************************************************************************/
114 * Performs an input operation for a 32-bit memory location by reading from the
115 * specified address and returning the Value read from that address.
117 * @param Addr contains the address to perform the input operation
120 * @return The Value read from the specified input address.
124 ******************************************************************************/
125 u32 Xil_In32(UINTPTR Addr)
127 return *(volatile u32 *) Addr;
130 /*****************************************************************************/
133 * Performs an output operation for an 8-bit memory location by writing the
134 * specified Value to the the specified address.
136 * @param Addr contains the address to perform the output operation
138 * @param Value contains the Value to be output at the specified address.
144 ******************************************************************************/
145 void Xil_Out8(INTPTR Addr, u8 Value)
147 volatile u8 *LocalAddr = (u8 *)Addr;
151 /*****************************************************************************/
154 * Performs an output operation for a 16-bit memory location by writing the
155 * specified Value to the the specified address.
157 * @param Addr contains the address to perform the output operation
159 * @param Value contains the Value to be output at the specified address.
165 ******************************************************************************/
166 void Xil_Out16(INTPTR Addr, u16 Value)
168 volatile u16 *LocalAddr = (u16 *)Addr;
172 /*****************************************************************************/
175 * Performs an output operation for a 32-bit memory location by writing the
176 * specified Value to the the specified address.
178 * @param Addr contains the address to perform the output operation
180 * @param Value contains the Value to be output at the specified address.
186 ******************************************************************************/
187 void Xil_Out32(UINTPTR Addr, u32 Value)
189 volatile u32 *LocalAddr = (u32 *)Addr;
193 /*****************************************************************************/
196 * Performs an input operation for a 16-bit memory location by reading from the
197 * specified address and returning the byte-swapped Value read from that
200 * @param Addr contains the address to perform the input operation
203 * @return The byte-swapped Value read from the specified input address.
207 ******************************************************************************/
208 u16 Xil_In16BE(INTPTR Addr)
213 temp = Xil_In16(Addr);
215 result = Xil_EndianSwap16(temp);
220 /*****************************************************************************/
223 * Performs an input operation for a 32-bit memory location by reading from the
224 * specified address and returning the byte-swapped Value read from that
227 * @param Addr contains the address to perform the input operation
230 * @return The byte-swapped Value read from the specified input address.
234 ******************************************************************************/
235 u32 Xil_In32BE(INTPTR Addr)
240 temp = Xil_In32(Addr);
242 result = Xil_EndianSwap32(temp);
247 /*****************************************************************************/
250 * Performs an output operation for a 16-bit memory location by writing the
251 * specified Value to the the specified address. The Value is byte-swapped
252 * before being written.
254 * @param Addr contains the address to perform the output operation
256 * @param Value contains the Value to be output at the specified address.
262 ******************************************************************************/
263 void Xil_Out16BE(INTPTR Addr, u16 Value)
267 temp = Xil_EndianSwap16(Value);
269 Xil_Out16(Addr, temp);
272 /*****************************************************************************/
275 * Performs an output operation for a 32-bit memory location by writing the
276 * specified Value to the the specified address. The Value is byte-swapped
277 * before being written.
279 * @param Addr contains the address to perform the output operation
281 * @param Value contains the Value to be output at the specified address.
287 ******************************************************************************/
288 void Xil_Out32BE(INTPTR Addr, u32 Value)
292 temp = Xil_EndianSwap32(Value);
294 Xil_Out32(Addr, temp);
297 /*****************************************************************************/
300 * Perform a 16-bit endian converion.
302 * @param Data contains the value to be converted.
304 * @return converted value.
308 ******************************************************************************/
309 u16 Xil_EndianSwap16(u16 Data)
311 return (u16) (((Data & 0xFF00U) >> 8U) | ((Data & 0x00FFU) << 8U));
314 /*****************************************************************************/
317 * Perform a 32-bit endian converion.
319 * @param Data contains the value to be converted.
321 * @return converted value.
325 ******************************************************************************/
326 u32 Xil_EndianSwap32(u32 Data)
331 /* get each of the half words from the 32 bit word */
333 LoWord = (u16) (Data & 0x0000FFFFU);
334 HiWord = (u16) ((Data & 0xFFFF0000U) >> 16U);
336 /* byte swap each of the 16 bit half words */
338 LoWord = (((LoWord & 0xFF00U) >> 8U) | ((LoWord & 0x00FFU) << 8U));
339 HiWord = (((HiWord & 0xFF00U) >> 8U) | ((HiWord & 0x00FFU) << 8U));
341 /* swap the half words before returning the value */
343 return ((((u32)LoWord) << (u32)16U) | (u32)HiWord);