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Linux/arch/arm/mach-u300/dummyspichip.c

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  1 /*
  2  * arch/arm/mach-u300/dummyspichip.c
  3  *
  4  * Copyright (C) 2007-2009 ST-Ericsson AB
  5  * License terms: GNU General Public License (GPL) version 2
  6  * This is a dummy loopback SPI "chip" used for testing SPI.
  7  * Author: Linus Walleij <linus.walleij@stericsson.com>
  8  */
  9 #include <linux/init.h>
 10 #include <linux/module.h>
 11 #include <linux/kernel.h>
 12 #include <linux/device.h>
 13 #include <linux/err.h>
 14 #include <linux/sysfs.h>
 15 #include <linux/mutex.h>
 16 #include <linux/spi/spi.h>
 17 #include <linux/dma-mapping.h>
 18 #include <linux/slab.h>
 19 /*
 20  * WARNING! Do not include this pl022-specific controller header
 21  * for any generic driver. It is only done in this dummy chip
 22  * because we alter the chip configuration in order to test some
 23  * different settings on the loopback device. Normal chip configs
 24  * shall be STATIC and not altered by the driver!
 25  */
 26 #include <linux/amba/pl022.h>
 27 
 28 struct dummy {
 29         struct device *dev;
 30         struct mutex lock;
 31 };
 32 
 33 #define DMA_TEST_SIZE 2048
 34 
 35 /* When we cat /sys/bus/spi/devices/spi0.0/looptest this will be triggered */
 36 static ssize_t dummy_looptest(struct device *dev,
 37                 struct device_attribute *attr, char *buf)
 38 {
 39         struct spi_device *spi = to_spi_device(dev);
 40         struct dummy *p_dummy = dev_get_drvdata(&spi->dev);
 41 
 42         /*
 43          * WARNING! Do not dereference the chip-specific data in any normal
 44          * driver for a chip. It is usually STATIC and shall not be read
 45          * or written to. Your chip driver should NOT depend on fields in this
 46          * struct, this is just used here to alter the behaviour of the chip
 47          * in order to perform tests.
 48          */
 49         int status;
 50         u8 txbuf[14] = {0xDE, 0xAD, 0xBE, 0xEF, 0x2B, 0xAD,
 51                         0xCA, 0xFE, 0xBA, 0xBE, 0xB1, 0x05,
 52                         0xF0, 0x0D};
 53         u8 rxbuf[14];
 54         u8 *bigtxbuf_virtual;
 55         u8 *bigrxbuf_virtual;
 56 
 57         if (mutex_lock_interruptible(&p_dummy->lock))
 58                 return -ERESTARTSYS;
 59 
 60         bigtxbuf_virtual = kmalloc(DMA_TEST_SIZE, GFP_KERNEL);
 61         if (bigtxbuf_virtual == NULL) {
 62                 status = -ENOMEM;
 63                 goto out;
 64         }
 65         bigrxbuf_virtual = kmalloc(DMA_TEST_SIZE, GFP_KERNEL);
 66 
 67         /* Fill TXBUF with some happy pattern */
 68         memset(bigtxbuf_virtual, 0xAA, DMA_TEST_SIZE);
 69 
 70         /*
 71          * Force chip to 8 bit mode
 72          * WARNING: NEVER DO THIS IN REAL DRIVER CODE, THIS SHOULD BE STATIC!
 73          */
 74         spi->bits_per_word = 8;
 75         /* You should NOT DO THIS EITHER */
 76         spi->master->setup(spi);
 77 
 78         /* Now run the tests for 8bit mode */
 79         pr_info("Simple test 1: write 0xAA byte, read back garbage byte "
 80                 "in 8bit mode\n");
 81         status = spi_w8r8(spi, 0xAA);
 82         if (status < 0)
 83                 pr_warning("Siple test 1: FAILURE: spi_write_then_read "
 84                            "failed with status %d\n", status);
 85         else
 86                 pr_info("Simple test 1: SUCCESS!\n");
 87 
 88         pr_info("Simple test 2: write 8 bytes, read back 8 bytes garbage "
 89                 "in 8bit mode (full FIFO)\n");
 90         status = spi_write_then_read(spi, &txbuf[0], 8, &rxbuf[0], 8);
 91         if (status < 0)
 92                 pr_warning("Simple test 2: FAILURE: spi_write_then_read() "
 93                            "failed with status %d\n", status);
 94         else
 95                 pr_info("Simple test 2: SUCCESS!\n");
 96 
 97         pr_info("Simple test 3: write 14 bytes, read back 14 bytes garbage "
 98                 "in 8bit mode (see if we overflow FIFO)\n");
 99         status = spi_write_then_read(spi, &txbuf[0], 14, &rxbuf[0], 14);
100         if (status < 0)
101                 pr_warning("Simple test 3: FAILURE: failed with status %d "
102                            "(probably FIFO overrun)\n", status);
103         else
104                 pr_info("Simple test 3: SUCCESS!\n");
105 
106         pr_info("Simple test 4: write 8 bytes with spi_write(), read 8 "
107                 "bytes garbage with spi_read() in 8bit mode\n");
108         status = spi_write(spi, &txbuf[0], 8);
109         if (status < 0)
110                 pr_warning("Simple test 4 step 1: FAILURE: spi_write() "
111                            "failed with status %d\n", status);
112         else
113                 pr_info("Simple test 4 step 1: SUCCESS!\n");
114         status = spi_read(spi, &rxbuf[0], 8);
115         if (status < 0)
116                 pr_warning("Simple test 4 step 2: FAILURE: spi_read() "
117                            "failed with status %d\n", status);
118         else
119                 pr_info("Simple test 4 step 2: SUCCESS!\n");
120 
121         pr_info("Simple test 5: write 14 bytes with spi_write(), read "
122                 "14 bytes garbage with spi_read() in 8bit mode\n");
123         status = spi_write(spi, &txbuf[0], 14);
124         if (status < 0)
125                 pr_warning("Simple test 5 step 1: FAILURE: spi_write() "
126                            "failed with status %d (probably FIFO overrun)\n",
127                            status);
128         else
129                 pr_info("Simple test 5 step 1: SUCCESS!\n");
130         status = spi_read(spi, &rxbuf[0], 14);
131         if (status < 0)
132                 pr_warning("Simple test 5 step 2: FAILURE: spi_read() "
133                            "failed with status %d (probably FIFO overrun)\n",
134                            status);
135         else
136                 pr_info("Simple test 5: SUCCESS!\n");
137 
138         pr_info("Simple test 6: write %d bytes with spi_write(), "
139                 "read %d bytes garbage with spi_read() in 8bit mode\n",
140                 DMA_TEST_SIZE, DMA_TEST_SIZE);
141         status = spi_write(spi, &bigtxbuf_virtual[0], DMA_TEST_SIZE);
142         if (status < 0)
143                 pr_warning("Simple test 6 step 1: FAILURE: spi_write() "
144                            "failed with status %d (probably FIFO overrun)\n",
145                            status);
146         else
147                 pr_info("Simple test 6 step 1: SUCCESS!\n");
148         status = spi_read(spi, &bigrxbuf_virtual[0], DMA_TEST_SIZE);
149         if (status < 0)
150                 pr_warning("Simple test 6 step 2: FAILURE: spi_read() "
151                            "failed with status %d (probably FIFO overrun)\n",
152                            status);
153         else
154                 pr_info("Simple test 6: SUCCESS!\n");
155 
156 
157         /*
158          * Force chip to 16 bit mode
159          * WARNING: NEVER DO THIS IN REAL DRIVER CODE, THIS SHOULD BE STATIC!
160          */
161         spi->bits_per_word = 16;
162         /* You should NOT DO THIS EITHER */
163         spi->master->setup(spi);
164 
165         pr_info("Simple test 7: write 0xAA byte, read back garbage byte "
166                 "in 16bit bus mode\n");
167         status = spi_w8r8(spi, 0xAA);
168         if (status == -EIO)
169                 pr_info("Simple test 7: SUCCESS! (expected failure with "
170                         "status EIO)\n");
171         else if (status < 0)
172                 pr_warning("Siple test 7: FAILURE: spi_write_then_read "
173                            "failed with status %d\n", status);
174         else
175                 pr_warning("Siple test 7: FAILURE: spi_write_then_read "
176                            "succeeded but it was expected to fail!\n");
177 
178         pr_info("Simple test 8: write 8 bytes, read back 8 bytes garbage "
179                 "in 16bit mode (full FIFO)\n");
180         status = spi_write_then_read(spi, &txbuf[0], 8, &rxbuf[0], 8);
181         if (status < 0)
182                 pr_warning("Simple test 8: FAILURE: spi_write_then_read() "
183                            "failed with status %d\n", status);
184         else
185                 pr_info("Simple test 8: SUCCESS!\n");
186 
187         pr_info("Simple test 9: write 14 bytes, read back 14 bytes garbage "
188                 "in 16bit mode (see if we overflow FIFO)\n");
189         status = spi_write_then_read(spi, &txbuf[0], 14, &rxbuf[0], 14);
190         if (status < 0)
191                 pr_warning("Simple test 9: FAILURE: failed with status %d "
192                            "(probably FIFO overrun)\n", status);
193         else
194                 pr_info("Simple test 9: SUCCESS!\n");
195 
196         pr_info("Simple test 10: write %d bytes with spi_write(), "
197                "read %d bytes garbage with spi_read() in 16bit mode\n",
198                DMA_TEST_SIZE, DMA_TEST_SIZE);
199         status = spi_write(spi, &bigtxbuf_virtual[0], DMA_TEST_SIZE);
200         if (status < 0)
201                 pr_warning("Simple test 10 step 1: FAILURE: spi_write() "
202                            "failed with status %d (probably FIFO overrun)\n",
203                            status);
204         else
205                 pr_info("Simple test 10 step 1: SUCCESS!\n");
206 
207         status = spi_read(spi, &bigrxbuf_virtual[0], DMA_TEST_SIZE);
208         if (status < 0)
209                 pr_warning("Simple test 10 step 2: FAILURE: spi_read() "
210                            "failed with status %d (probably FIFO overrun)\n",
211                            status);
212         else
213                 pr_info("Simple test 10: SUCCESS!\n");
214 
215         status = sprintf(buf, "loop test complete\n");
216         kfree(bigrxbuf_virtual);
217         kfree(bigtxbuf_virtual);
218  out:
219         mutex_unlock(&p_dummy->lock);
220         return status;
221 }
222 
223 static DEVICE_ATTR(looptest, S_IRUGO, dummy_looptest, NULL);
224 
225 static int pl022_dummy_probe(struct spi_device *spi)
226 {
227         struct dummy *p_dummy;
228         int status;
229 
230         dev_info(&spi->dev, "probing dummy SPI device\n");
231 
232         p_dummy = kzalloc(sizeof *p_dummy, GFP_KERNEL);
233         if (!p_dummy)
234                 return -ENOMEM;
235 
236         dev_set_drvdata(&spi->dev, p_dummy);
237         mutex_init(&p_dummy->lock);
238 
239         /* sysfs hook */
240         status = device_create_file(&spi->dev, &dev_attr_looptest);
241         if (status) {
242                 dev_dbg(&spi->dev, "device_create_file looptest failure.\n");
243                 goto out_dev_create_looptest_failed;
244         }
245 
246         return 0;
247 
248 out_dev_create_looptest_failed:
249         dev_set_drvdata(&spi->dev, NULL);
250         kfree(p_dummy);
251         return status;
252 }
253 
254 static int pl022_dummy_remove(struct spi_device *spi)
255 {
256         struct dummy *p_dummy = dev_get_drvdata(&spi->dev);
257 
258         dev_info(&spi->dev, "removing dummy SPI device\n");
259         device_remove_file(&spi->dev, &dev_attr_looptest);
260         dev_set_drvdata(&spi->dev, NULL);
261         kfree(p_dummy);
262 
263         return 0;
264 }
265 
266 static const struct of_device_id pl022_dummy_dt_match[] = {
267         { .compatible = "arm,pl022-dummy" },
268         {},
269 };
270 
271 static struct spi_driver pl022_dummy_driver = {
272         .driver = {
273                 .name   = "spi-dummy",
274                 .owner  = THIS_MODULE,
275                 .of_match_table = pl022_dummy_dt_match,
276         },
277         .probe  = pl022_dummy_probe,
278         .remove = pl022_dummy_remove,
279 };
280 
281 module_spi_driver(pl022_dummy_driver);
282 MODULE_AUTHOR("Linus Walleij <linus.walleij@stericsson.com>");
283 MODULE_DESCRIPTION("PL022 SSP/SPI DUMMY Linux driver");
284 MODULE_LICENSE("GPL");
285 

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