ARM: 5667/3: U300 SSP/SPI board setup and test

This adds a U300 board configuration for the PL022 SSP/SPI
PrimeCell driver recently merged to the 2.6.31-rc series.
Further it adds a dummy loopback SPI chip that can be used
for testing the SPI functionality on a running system using
the loopback mode of PL022.

Signed-off-by: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 290 insertions, 0 deletions

diff --git a/arch/arm/mach-u300/dummyspichip.c b/arch/arm/mach-u300/dummyspichip.c
new file mode 100644
index 000000000000..962f9de454de
--- /dev/null
+++ b/arch/arm/mach-u300/dummyspichip.c
@@ -0,0 +1,290 @@
+/*
+ * arch/arm/mach-u300/dummyspichip.c
+ *
+ * Copyright (C) 2007-2009 ST-Ericsson AB
+ * License terms: GNU General Public License (GPL) version 2
+ * This is a dummy loopback SPI "chip" used for testing SPI.
+ * Author: Linus Walleij <linus.walleij@stericsson.com>
+ */
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/sysfs.h>
+#include <linux/mutex.h>
+#include <linux/spi/spi.h>
+#include <linux/dma-mapping.h>
+/*
+ * WARNING! Do not include this pl022-specific controller header
+ * for any generic driver. It is only done in this dummy chip
+ * because we alter the chip configuration in order to test some
+ * different settings on the loopback device. Normal chip configs
+ * shall be STATIC and not altered by the driver!
+ */
+#include <linux/amba/pl022.h>
+
+struct dummy {
+	struct device *dev;
+	struct mutex lock;
+};
+
+#define DMA_TEST_SIZE 2048
+
+/* When we cat /sys/bus/spi/devices/spi0.0/looptest this will be triggered */
+static ssize_t dummy_looptest(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct spi_device *spi = to_spi_device(dev);
+	struct dummy *p_dummy = dev_get_drvdata(&spi->dev);
+
+	/*
+	 * WARNING! Do not dereference the chip-specific data in any normal
+	 * driver for a chip. It is usually STATIC and shall not be read
+	 * or written to. Your chip driver should NOT depend on fields in this
+	 * struct, this is just used here to alter the behaviour of the chip
+	 * in order to perform tests.
+	 */
+	struct pl022_config_chip *chip_info = spi->controller_data;
+	int status;
+	u8 txbuf[14] = {0xDE, 0xAD, 0xBE, 0xEF, 0x2B, 0xAD,
+			0xCA, 0xFE, 0xBA, 0xBE, 0xB1, 0x05,
+			0xF0, 0x0D};
+	u8 rxbuf[14];
+	u8 *bigtxbuf_virtual;
+	u8 *bigrxbuf_virtual;
+
+	if (mutex_lock_interruptible(&p_dummy->lock))
+		return -ERESTARTSYS;
+
+	bigtxbuf_virtual = kmalloc(DMA_TEST_SIZE, GFP_KERNEL);
+	if (bigtxbuf_virtual == NULL) {
+		status = -ENOMEM;
+		goto out;
+	}
+	bigrxbuf_virtual = kmalloc(DMA_TEST_SIZE, GFP_KERNEL);
+
+	/* Fill TXBUF with some happy pattern */
+	memset(bigtxbuf_virtual, 0xAA, DMA_TEST_SIZE);
+
+	/*
+	 * Force chip to 8 bit mode
+	 * WARNING: NEVER DO THIS IN REAL DRIVER CODE, THIS SHOULD BE STATIC!
+	 */
+	chip_info->data_size = SSP_DATA_BITS_8;
+	/* You should NOT DO THIS EITHER */
+	spi->master->setup(spi);
+
+	/* Now run the tests for 8bit mode */
+	pr_info("Simple test 1: write 0xAA byte, read back garbage byte "
+		"in 8bit mode\n");
+	status = spi_w8r8(spi, 0xAA);
+	if (status < 0)
+		pr_warning("Siple test 1: FAILURE: spi_write_then_read "
+			   "failed with status %d\n", status);
+	else
+		pr_info("Simple test 1: SUCCESS!\n");
+
+	pr_info("Simple test 2: write 8 bytes, read back 8 bytes garbage "
+		"in 8bit mode (full FIFO)\n");
+	status = spi_write_then_read(spi, &txbuf[0], 8, &rxbuf[0], 8);
+	if (status < 0)
+		pr_warning("Simple test 2: FAILURE: spi_write_then_read() "
+			   "failed with status %d\n", status);
+	else
+		pr_info("Simple test 2: SUCCESS!\n");
+
+	pr_info("Simple test 3: write 14 bytes, read back 14 bytes garbage "
+		"in 8bit mode (see if we overflow FIFO)\n");
+	status = spi_write_then_read(spi, &txbuf[0], 14, &rxbuf[0], 14);
+	if (status < 0)
+		pr_warning("Simple test 3: FAILURE: failed with status %d "
+			   "(probably FIFO overrun)\n", status);
+	else
+		pr_info("Simple test 3: SUCCESS!\n");
+
+	pr_info("Simple test 4: write 8 bytes with spi_write(), read 8 "
+		"bytes garbage with spi_read() in 8bit mode\n");
+	status = spi_write(spi, &txbuf[0], 8);
+	if (status < 0)
+		pr_warning("Simple test 4 step 1: FAILURE: spi_write() "
+			   "failed with status %d\n", status);
+	else
+		pr_info("Simple test 4 step 1: SUCCESS!\n");
+	status = spi_read(spi, &rxbuf[0], 8);
+	if (status < 0)
+		pr_warning("Simple test 4 step 2: FAILURE: spi_read() "
+			   "failed with status %d\n", status);
+	else
+		pr_info("Simple test 4 step 2: SUCCESS!\n");
+
+	pr_info("Simple test 5: write 14 bytes with spi_write(), read "
+		"14 bytes garbage with spi_read() in 8bit mode\n");
+	status = spi_write(spi, &txbuf[0], 14);
+	if (status < 0)
+		pr_warning("Simple test 5 step 1: FAILURE: spi_write() "
+			   "failed with status %d (probably FIFO overrun)\n",
+			   status);
+	else
+		pr_info("Simple test 5 step 1: SUCCESS!\n");
+	status = spi_read(spi, &rxbuf[0], 14);
+	if (status < 0)
+		pr_warning("Simple test 5 step 2: FAILURE: spi_read() "
+			   "failed with status %d (probably FIFO overrun)\n",
+			   status);
+	else
+		pr_info("Simple test 5: SUCCESS!\n");
+
+	pr_info("Simple test 6: write %d bytes with spi_write(), "
+		"read %d bytes garbage with spi_read() in 8bit mode\n",
+		DMA_TEST_SIZE, DMA_TEST_SIZE);
+	status = spi_write(spi, &bigtxbuf_virtual[0], DMA_TEST_SIZE);
+	if (status < 0)
+		pr_warning("Simple test 6 step 1: FAILURE: spi_write() "
+			   "failed with status %d (probably FIFO overrun)\n",
+			   status);
+	else
+		pr_info("Simple test 6 step 1: SUCCESS!\n");
+	status = spi_read(spi, &bigrxbuf_virtual[0], DMA_TEST_SIZE);
+	if (status < 0)
+		pr_warning("Simple test 6 step 2: FAILURE: spi_read() "
+			   "failed with status %d (probably FIFO overrun)\n",
+			   status);
+	else
+		pr_info("Simple test 6: SUCCESS!\n");
+
+
+	/*
+	 * Force chip to 16 bit mode
+	 * WARNING: NEVER DO THIS IN REAL DRIVER CODE, THIS SHOULD BE STATIC!
+	 */
+	chip_info->data_size = SSP_DATA_BITS_16;
+	/* You should NOT DO THIS EITHER */
+	spi->master->setup(spi);
+
+	pr_info("Simple test 7: write 0xAA byte, read back garbage byte "
+		"in 16bit bus mode\n");
+	status = spi_w8r8(spi, 0xAA);
+	if (status == -EIO)
+		pr_info("Simple test 7: SUCCESS! (expected failure with "
+			"status EIO)\n");
+	else if (status < 0)
+		pr_warning("Siple test 7: FAILURE: spi_write_then_read "
+			   "failed with status %d\n", status);
+	else
+		pr_warning("Siple test 7: FAILURE: spi_write_then_read "
+			   "succeeded but it was expected to fail!\n");
+
+	pr_info("Simple test 8: write 8 bytes, read back 8 bytes garbage "
+		"in 16bit mode (full FIFO)\n");
+	status = spi_write_then_read(spi, &txbuf[0], 8, &rxbuf[0], 8);
+	if (status < 0)
+		pr_warning("Simple test 8: FAILURE: spi_write_then_read() "
+			   "failed with status %d\n", status);
+	else
+		pr_info("Simple test 8: SUCCESS!\n");
+
+	pr_info("Simple test 9: write 14 bytes, read back 14 bytes garbage "
+		"in 16bit mode (see if we overflow FIFO)\n");
+	status = spi_write_then_read(spi, &txbuf[0], 14, &rxbuf[0], 14);
+	if (status < 0)
+		pr_warning("Simple test 9: FAILURE: failed with status %d "
+			   "(probably FIFO overrun)\n", status);
+	else
+		pr_info("Simple test 9: SUCCESS!\n");
+
+	pr_info("Simple test 10: write %d bytes with spi_write(), "
+	       "read %d bytes garbage with spi_read() in 16bit mode\n",
+	       DMA_TEST_SIZE, DMA_TEST_SIZE);
+	status = spi_write(spi, &bigtxbuf_virtual[0], DMA_TEST_SIZE);
+	if (status < 0)
+		pr_warning("Simple test 10 step 1: FAILURE: spi_write() "
+			   "failed with status %d (probably FIFO overrun)\n",
+			   status);
+	else
+		pr_info("Simple test 10 step 1: SUCCESS!\n");
+
+	status = spi_read(spi, &bigrxbuf_virtual[0], DMA_TEST_SIZE);
+	if (status < 0)
+		pr_warning("Simple test 10 step 2: FAILURE: spi_read() "
+			   "failed with status %d (probably FIFO overrun)\n",
+			   status);
+	else
+		pr_info("Simple test 10: SUCCESS!\n");
+
+	status = sprintf(buf, "loop test complete\n");
+	kfree(bigrxbuf_virtual);
+	kfree(bigtxbuf_virtual);
+ out:
+	mutex_unlock(&p_dummy->lock);
+	return status;
+}
+
+static DEVICE_ATTR(looptest, S_IRUGO, dummy_looptest, NULL);
+
+static int __devinit pl022_dummy_probe(struct spi_device *spi)
+{
+	struct dummy *p_dummy;
+	int status;
+
+	dev_info(&spi->dev, "probing dummy SPI device\n");
+
+	p_dummy = kzalloc(sizeof *p_dummy, GFP_KERNEL);
+	if (!p_dummy)
+		return -ENOMEM;
+
+	dev_set_drvdata(&spi->dev, p_dummy);
+	mutex_init(&p_dummy->lock);
+
+	/* sysfs hook */
+	status = device_create_file(&spi->dev, &dev_attr_looptest);
+	if (status) {
+		dev_dbg(&spi->dev, "device_create_file looptest failure.\n");
+		goto out_dev_create_looptest_failed;
+	}
+
+	return 0;
+
+out_dev_create_looptest_failed:
+	dev_set_drvdata(&spi->dev, NULL);
+	kfree(p_dummy);
+	return status;
+}
+
+static int __devexit pl022_dummy_remove(struct spi_device *spi)
+{
+	struct dummy *p_dummy = dev_get_drvdata(&spi->dev);
+
+	dev_info(&spi->dev, "removing dummy SPI device\n");
+	device_remove_file(&spi->dev, &dev_attr_looptest);
+	dev_set_drvdata(&spi->dev, NULL);
+	kfree(p_dummy);
+
+	return 0;
+}
+
+static struct spi_driver pl022_dummy_driver = {
+	.driver = {
+		.name	= "spi-dummy",
+		.owner	= THIS_MODULE,
+	},
+	.probe	= pl022_dummy_probe,
+	.remove	= __devexit_p(pl022_dummy_remove),
+};
+
+static int __init pl022_init_dummy(void)
+{
+	return spi_register_driver(&pl022_dummy_driver);
+}
+
+static void __exit pl022_exit_dummy(void)
+{
+	spi_unregister_driver(&pl022_dummy_driver);
+}
+
+module_init(pl022_init_dummy);
+module_exit(pl022_exit_dummy);
+
+MODULE_AUTHOR("Linus Walleij <linus.walleij@stericsson.com>");
+MODULE_DESCRIPTION("PL022 SSP/SPI DUMMY Linux driver");
+MODULE_LICENSE("GPL");