1 /*****************************************************************************
5 * This program is free software; you can redistribute it and/or modify it
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27 * (c) Copyright 2003-2008 Xilinx Inc.
28 * All rights reserved.
30 * You should have received a copy of the GNU General Public License along
31 * with this program; if not, write to the Free Software Foundation, Inc.,
32 * 675 Mass Ave, Cambridge, MA 02139, USA.
34 *****************************************************************************/
36 #include "buffer_icap.h"
38 /* Indicates how many bytes will fit in a buffer. (1 BRAM) */
39 #define XHI_MAX_BUFFER_BYTES 2048
40 #define XHI_MAX_BUFFER_INTS (XHI_MAX_BUFFER_BYTES >> 2)
42 /* File access and error constants */
43 #define XHI_DEVICE_READ_ERROR -1
44 #define XHI_DEVICE_WRITE_ERROR -2
45 #define XHI_BUFFER_OVERFLOW_ERROR -3
47 #define XHI_DEVICE_READ 0x1
48 #define XHI_DEVICE_WRITE 0x0
50 /* Constants for checking transfer status */
51 #define XHI_CYCLE_DONE 0
52 #define XHI_CYCLE_EXECUTING 1
54 /* buffer_icap register offsets */
56 /* Size of transfer, read & write */
57 #define XHI_SIZE_REG_OFFSET 0x800L
58 /* offset into bram, read & write */
59 #define XHI_BRAM_OFFSET_REG_OFFSET 0x804L
60 /* Read not Configure, direction of transfer. Write only */
61 #define XHI_RNC_REG_OFFSET 0x808L
62 /* Indicates transfer complete. Read only */
63 #define XHI_STATUS_REG_OFFSET 0x80CL
65 /* Constants for setting the RNC register */
66 #define XHI_CONFIGURE 0x0UL
67 #define XHI_READBACK 0x1UL
69 /* Constants for the Done register */
70 #define XHI_NOT_FINISHED 0x0UL
71 #define XHI_FINISHED 0x1UL
73 #define XHI_BUFFER_START 0
76 * buffer_icap_get_status: Get the contents of the status register.
77 * @parameter base_address: is the base address of the device
79 * The status register contains the ICAP status and the done bit.
91 static inline u32 buffer_icap_get_status(void __iomem *base_address)
93 return in_be32(base_address + XHI_STATUS_REG_OFFSET);
97 * buffer_icap_get_bram: Reads data from the storage buffer bram.
98 * @parameter base_address: contains the base address of the component.
99 * @parameter offset: The word offset from which the data should be read.
101 * A bram is used as a configuration memory cache. One frame of data can
102 * be stored in this "storage buffer".
104 static inline u32 buffer_icap_get_bram(void __iomem *base_address,
107 return in_be32(base_address + (offset << 2));
111 * buffer_icap_busy: Return true if the icap device is busy
112 * @parameter base_address: is the base address of the device
114 * The queries the low order bit of the status register, which
115 * indicates whether the current configuration or readback operation
118 static inline bool buffer_icap_busy(void __iomem *base_address)
120 return (buffer_icap_get_status(base_address) & 1) == XHI_NOT_FINISHED;
124 * buffer_icap_busy: Return true if the icap device is not busy
125 * @parameter base_address: is the base address of the device
127 * The queries the low order bit of the status register, which
128 * indicates whether the current configuration or readback operation
131 static inline bool buffer_icap_done(void __iomem *base_address)
133 return (buffer_icap_get_status(base_address) & 1) == XHI_FINISHED;
137 * buffer_icap_set_size: Set the size register.
138 * @parameter base_address: is the base address of the device
139 * @parameter data: The size in bytes.
141 * The size register holds the number of 8 bit bytes to transfer between
142 * bram and the icap (or icap to bram).
144 static inline void buffer_icap_set_size(void __iomem *base_address,
147 out_be32(base_address + XHI_SIZE_REG_OFFSET, data);
151 * buffer_icap_mSetoffsetReg: Set the bram offset register.
152 * @parameter base_address: contains the base address of the device.
153 * @parameter data: is the value to be written to the data register.
155 * The bram offset register holds the starting bram address to transfer
156 * data from during configuration or write data to during readback.
158 static inline void buffer_icap_set_offset(void __iomem *base_address,
161 out_be32(base_address + XHI_BRAM_OFFSET_REG_OFFSET, data);
165 * buffer_icap_set_rnc: Set the RNC (Readback not Configure) register.
166 * @parameter base_address: contains the base address of the device.
167 * @parameter data: is the value to be written to the data register.
169 * The RNC register determines the direction of the data transfer. It
170 * controls whether a configuration or readback take place. Writing to
171 * this register initiates the transfer. A value of 1 initiates a
172 * readback while writing a value of 0 initiates a configuration.
174 static inline void buffer_icap_set_rnc(void __iomem *base_address,
177 out_be32(base_address + XHI_RNC_REG_OFFSET, data);
181 * buffer_icap_set_bram: Write data to the storage buffer bram.
182 * @parameter base_address: contains the base address of the component.
183 * @parameter offset: The word offset at which the data should be written.
184 * @parameter data: The value to be written to the bram offset.
186 * A bram is used as a configuration memory cache. One frame of data can
187 * be stored in this "storage buffer".
189 static inline void buffer_icap_set_bram(void __iomem *base_address,
190 u32 offset, u32 data)
192 out_be32(base_address + (offset << 2), data);
196 * buffer_icap_device_read: Transfer bytes from ICAP to the storage buffer.
197 * @parameter drvdata: a pointer to the drvdata.
198 * @parameter offset: The storage buffer start address.
199 * @parameter count: The number of words (32 bit) to read from the
202 static int buffer_icap_device_read(struct hwicap_drvdata *drvdata,
203 u32 offset, u32 count)
207 void __iomem *base_address = drvdata->base_address;
209 if (buffer_icap_busy(base_address))
212 if ((offset + count) > XHI_MAX_BUFFER_INTS)
215 /* setSize count*4 to get bytes. */
216 buffer_icap_set_size(base_address, (count << 2));
217 buffer_icap_set_offset(base_address, offset);
218 buffer_icap_set_rnc(base_address, XHI_READBACK);
220 while (buffer_icap_busy(base_address)) {
222 if (retries > XHI_MAX_RETRIES)
230 * buffer_icap_device_write: Transfer bytes from ICAP to the storage buffer.
231 * @parameter drvdata: a pointer to the drvdata.
232 * @parameter offset: The storage buffer start address.
233 * @parameter count: The number of words (32 bit) to read from the
236 static int buffer_icap_device_write(struct hwicap_drvdata *drvdata,
237 u32 offset, u32 count)
241 void __iomem *base_address = drvdata->base_address;
243 if (buffer_icap_busy(base_address))
246 if ((offset + count) > XHI_MAX_BUFFER_INTS)
249 /* setSize count*4 to get bytes. */
250 buffer_icap_set_size(base_address, count << 2);
251 buffer_icap_set_offset(base_address, offset);
252 buffer_icap_set_rnc(base_address, XHI_CONFIGURE);
254 while (buffer_icap_busy(base_address)) {
256 if (retries > XHI_MAX_RETRIES)
264 * buffer_icap_reset: Reset the logic of the icap device.
265 * @parameter drvdata: a pointer to the drvdata.
267 * Writing to the status register resets the ICAP logic in an internal
268 * version of the core. For the version of the core published in EDK,
271 void buffer_icap_reset(struct hwicap_drvdata *drvdata)
273 out_be32(drvdata->base_address + XHI_STATUS_REG_OFFSET, 0xFEFE);
277 * buffer_icap_set_configuration: Load a partial bitstream from system memory.
278 * @parameter drvdata: a pointer to the drvdata.
279 * @parameter data: Kernel address of the partial bitstream.
280 * @parameter size: the size of the partial bitstream in 32 bit words.
282 int buffer_icap_set_configuration(struct hwicap_drvdata *drvdata, u32 *data,
286 s32 buffer_count = 0;
290 void __iomem *base_address = drvdata->base_address;
292 /* Loop through all the data */
293 for (i = 0, buffer_count = 0; i < size; i++) {
295 /* Copy data to bram */
296 buffer_icap_set_bram(base_address, buffer_count, data[i]);
299 if (buffer_count < XHI_MAX_BUFFER_INTS - 1) {
304 /* Write data to ICAP */
305 status = buffer_icap_device_write(
308 XHI_MAX_BUFFER_INTS);
311 buffer_icap_reset(drvdata);
320 /* Write unwritten data to ICAP */
322 /* Write data to ICAP */
323 status = buffer_icap_device_write(drvdata, XHI_BUFFER_START,
327 buffer_icap_reset(drvdata);
336 * buffer_icap_get_configuration: Read configuration data from the device.
337 * @parameter drvdata: a pointer to the drvdata.
338 * @parameter data: Address of the data representing the partial bitstream
339 * @parameter size: the size of the partial bitstream in 32 bit words.
341 int buffer_icap_get_configuration(struct hwicap_drvdata *drvdata, u32 *data,
345 s32 buffer_count = 0;
348 void __iomem *base_address = drvdata->base_address;
350 /* Loop through all the data */
351 for (i = 0, buffer_count = XHI_MAX_BUFFER_INTS; i < size; i++) {
352 if (buffer_count == XHI_MAX_BUFFER_INTS) {
353 u32 words_remaining = size - i;
356 XHI_MAX_BUFFER_INTS ? words_remaining :
359 /* Read data from ICAP */
360 status = buffer_icap_device_read(
366 buffer_icap_reset(drvdata);
374 /* Copy data from bram */
375 data[i] = buffer_icap_get_bram(base_address, buffer_count);