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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>
This commit is contained in:
Linus Walleij
Russell King
parent
df1e0520f9
commit
c7c8c78fdf
@ -81,6 +81,18 @@ config MACH_U300_SEMI_IS_SHARED
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Memory Interface) from both from access and application
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side.
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config MACH_U300_SPIDUMMY
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bool "SSP/SPI dummy chip"
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select SPI
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select SPI_MASTER
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select SPI_PL022
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help
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This creates a small kernel module that creates a dummy
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SPI device to be used for loopback tests. Regularly used
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to test reference designs. If you're not testing SPI,
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you don't need it. Selecting this will activate the
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SPI framework and ARM PL022 support.
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comment "All the settings below must match the bootloader's settings"
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config MACH_U300_ACCESS_MEM_SIZE
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@ -9,3 +9,5 @@ obj- :=
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obj-$(CONFIG_ARCH_U300) += u300.o
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obj-$(CONFIG_MMC) += mmc.o
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obj-$(CONFIG_SPI_PL022) += spi.o
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obj-$(CONFIG_MACH_U300_SPIDUMMY) += dummyspichip.o
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@ -32,6 +32,7 @@
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#include "clock.h"
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#include "mmc.h"
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#include "spi.h"
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/*
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* Static I/O mappings that are needed for booting the U300 platforms. The
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@ -611,6 +612,8 @@ void __init u300_init_devices(void)
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/* Wait for the PLL208 to lock if not locked in yet */
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while (!(readw(U300_SYSCON_VBASE + U300_SYSCON_CSR) &
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U300_SYSCON_CSR_PLL208_LOCK_IND));
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/* Initialize SPI device with some board specifics */
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u300_spi_init(&pl022_device);
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/* Register the AMBA devices in the AMBA bus abstraction layer */
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u300_clock_primecells();
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@ -622,6 +625,9 @@ void __init u300_init_devices(void)
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u300_assign_physmem();
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/* Register subdevices on the SPI bus */
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u300_spi_register_board_devices();
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/* Register the platform devices */
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platform_add_devices(platform_devs, ARRAY_SIZE(platform_devs));
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290
arch/arm/mach-u300/dummyspichip.c
Normal file
290
arch/arm/mach-u300/dummyspichip.c
Normal file
@ -0,0 +1,290 @@
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/*
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* arch/arm/mach-u300/dummyspichip.c
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*
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* Copyright (C) 2007-2009 ST-Ericsson AB
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* License terms: GNU General Public License (GPL) version 2
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* This is a dummy loopback SPI "chip" used for testing SPI.
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* Author: Linus Walleij <linus.walleij@stericsson.com>
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/device.h>
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#include <linux/err.h>
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#include <linux/sysfs.h>
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#include <linux/mutex.h>
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#include <linux/spi/spi.h>
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#include <linux/dma-mapping.h>
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/*
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* WARNING! Do not include this pl022-specific controller header
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* for any generic driver. It is only done in this dummy chip
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* because we alter the chip configuration in order to test some
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* different settings on the loopback device. Normal chip configs
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* shall be STATIC and not altered by the driver!
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*/
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#include <linux/amba/pl022.h>
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struct dummy {
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struct device *dev;
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struct mutex lock;
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};
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#define DMA_TEST_SIZE 2048
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/* When we cat /sys/bus/spi/devices/spi0.0/looptest this will be triggered */
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static ssize_t dummy_looptest(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct spi_device *spi = to_spi_device(dev);
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struct dummy *p_dummy = dev_get_drvdata(&spi->dev);
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/*
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* WARNING! Do not dereference the chip-specific data in any normal
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* driver for a chip. It is usually STATIC and shall not be read
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* or written to. Your chip driver should NOT depend on fields in this
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* struct, this is just used here to alter the behaviour of the chip
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* in order to perform tests.
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*/
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struct pl022_config_chip *chip_info = spi->controller_data;
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int status;
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u8 txbuf[14] = {0xDE, 0xAD, 0xBE, 0xEF, 0x2B, 0xAD,
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0xCA, 0xFE, 0xBA, 0xBE, 0xB1, 0x05,
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0xF0, 0x0D};
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u8 rxbuf[14];
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u8 *bigtxbuf_virtual;
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u8 *bigrxbuf_virtual;
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if (mutex_lock_interruptible(&p_dummy->lock))
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return -ERESTARTSYS;
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bigtxbuf_virtual = kmalloc(DMA_TEST_SIZE, GFP_KERNEL);
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if (bigtxbuf_virtual == NULL) {
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status = -ENOMEM;
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goto out;
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}
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bigrxbuf_virtual = kmalloc(DMA_TEST_SIZE, GFP_KERNEL);
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/* Fill TXBUF with some happy pattern */
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memset(bigtxbuf_virtual, 0xAA, DMA_TEST_SIZE);
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/*
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* Force chip to 8 bit mode
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* WARNING: NEVER DO THIS IN REAL DRIVER CODE, THIS SHOULD BE STATIC!
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*/
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chip_info->data_size = SSP_DATA_BITS_8;
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/* You should NOT DO THIS EITHER */
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spi->master->setup(spi);
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/* Now run the tests for 8bit mode */
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pr_info("Simple test 1: write 0xAA byte, read back garbage byte "
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"in 8bit mode\n");
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status = spi_w8r8(spi, 0xAA);
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if (status < 0)
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pr_warning("Siple test 1: FAILURE: spi_write_then_read "
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"failed with status %d\n", status);
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else
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pr_info("Simple test 1: SUCCESS!\n");
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pr_info("Simple test 2: write 8 bytes, read back 8 bytes garbage "
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"in 8bit mode (full FIFO)\n");
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status = spi_write_then_read(spi, &txbuf[0], 8, &rxbuf[0], 8);
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if (status < 0)
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pr_warning("Simple test 2: FAILURE: spi_write_then_read() "
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"failed with status %d\n", status);
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else
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pr_info("Simple test 2: SUCCESS!\n");
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pr_info("Simple test 3: write 14 bytes, read back 14 bytes garbage "
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"in 8bit mode (see if we overflow FIFO)\n");
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status = spi_write_then_read(spi, &txbuf[0], 14, &rxbuf[0], 14);
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if (status < 0)
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pr_warning("Simple test 3: FAILURE: failed with status %d "
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"(probably FIFO overrun)\n", status);
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else
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pr_info("Simple test 3: SUCCESS!\n");
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pr_info("Simple test 4: write 8 bytes with spi_write(), read 8 "
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"bytes garbage with spi_read() in 8bit mode\n");
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status = spi_write(spi, &txbuf[0], 8);
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if (status < 0)
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pr_warning("Simple test 4 step 1: FAILURE: spi_write() "
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"failed with status %d\n", status);
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else
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pr_info("Simple test 4 step 1: SUCCESS!\n");
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status = spi_read(spi, &rxbuf[0], 8);
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if (status < 0)
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pr_warning("Simple test 4 step 2: FAILURE: spi_read() "
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"failed with status %d\n", status);
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else
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pr_info("Simple test 4 step 2: SUCCESS!\n");
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pr_info("Simple test 5: write 14 bytes with spi_write(), read "
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"14 bytes garbage with spi_read() in 8bit mode\n");
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status = spi_write(spi, &txbuf[0], 14);
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if (status < 0)
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pr_warning("Simple test 5 step 1: FAILURE: spi_write() "
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"failed with status %d (probably FIFO overrun)\n",
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status);
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else
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pr_info("Simple test 5 step 1: SUCCESS!\n");
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status = spi_read(spi, &rxbuf[0], 14);
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if (status < 0)
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pr_warning("Simple test 5 step 2: FAILURE: spi_read() "
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"failed with status %d (probably FIFO overrun)\n",
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status);
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else
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pr_info("Simple test 5: SUCCESS!\n");
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pr_info("Simple test 6: write %d bytes with spi_write(), "
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"read %d bytes garbage with spi_read() in 8bit mode\n",
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DMA_TEST_SIZE, DMA_TEST_SIZE);
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status = spi_write(spi, &bigtxbuf_virtual[0], DMA_TEST_SIZE);
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if (status < 0)
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pr_warning("Simple test 6 step 1: FAILURE: spi_write() "
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"failed with status %d (probably FIFO overrun)\n",
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status);
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else
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pr_info("Simple test 6 step 1: SUCCESS!\n");
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status = spi_read(spi, &bigrxbuf_virtual[0], DMA_TEST_SIZE);
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if (status < 0)
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pr_warning("Simple test 6 step 2: FAILURE: spi_read() "
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"failed with status %d (probably FIFO overrun)\n",
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status);
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else
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pr_info("Simple test 6: SUCCESS!\n");
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/*
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* Force chip to 16 bit mode
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* WARNING: NEVER DO THIS IN REAL DRIVER CODE, THIS SHOULD BE STATIC!
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*/
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chip_info->data_size = SSP_DATA_BITS_16;
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/* You should NOT DO THIS EITHER */
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spi->master->setup(spi);
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pr_info("Simple test 7: write 0xAA byte, read back garbage byte "
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"in 16bit bus mode\n");
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status = spi_w8r8(spi, 0xAA);
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if (status == -EIO)
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pr_info("Simple test 7: SUCCESS! (expected failure with "
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"status EIO)\n");
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else if (status < 0)
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pr_warning("Siple test 7: FAILURE: spi_write_then_read "
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"failed with status %d\n", status);
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else
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pr_warning("Siple test 7: FAILURE: spi_write_then_read "
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"succeeded but it was expected to fail!\n");
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pr_info("Simple test 8: write 8 bytes, read back 8 bytes garbage "
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"in 16bit mode (full FIFO)\n");
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status = spi_write_then_read(spi, &txbuf[0], 8, &rxbuf[0], 8);
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if (status < 0)
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pr_warning("Simple test 8: FAILURE: spi_write_then_read() "
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"failed with status %d\n", status);
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else
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pr_info("Simple test 8: SUCCESS!\n");
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pr_info("Simple test 9: write 14 bytes, read back 14 bytes garbage "
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"in 16bit mode (see if we overflow FIFO)\n");
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status = spi_write_then_read(spi, &txbuf[0], 14, &rxbuf[0], 14);
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if (status < 0)
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pr_warning("Simple test 9: FAILURE: failed with status %d "
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"(probably FIFO overrun)\n", status);
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else
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pr_info("Simple test 9: SUCCESS!\n");
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pr_info("Simple test 10: write %d bytes with spi_write(), "
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"read %d bytes garbage with spi_read() in 16bit mode\n",
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DMA_TEST_SIZE, DMA_TEST_SIZE);
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status = spi_write(spi, &bigtxbuf_virtual[0], DMA_TEST_SIZE);
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if (status < 0)
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pr_warning("Simple test 10 step 1: FAILURE: spi_write() "
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"failed with status %d (probably FIFO overrun)\n",
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status);
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else
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pr_info("Simple test 10 step 1: SUCCESS!\n");
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status = spi_read(spi, &bigrxbuf_virtual[0], DMA_TEST_SIZE);
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if (status < 0)
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pr_warning("Simple test 10 step 2: FAILURE: spi_read() "
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"failed with status %d (probably FIFO overrun)\n",
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status);
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else
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pr_info("Simple test 10: SUCCESS!\n");
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status = sprintf(buf, "loop test complete\n");
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kfree(bigrxbuf_virtual);
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kfree(bigtxbuf_virtual);
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out:
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mutex_unlock(&p_dummy->lock);
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return status;
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}
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static DEVICE_ATTR(looptest, S_IRUGO, dummy_looptest, NULL);
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static int __devinit pl022_dummy_probe(struct spi_device *spi)
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{
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struct dummy *p_dummy;
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int status;
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dev_info(&spi->dev, "probing dummy SPI device\n");
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p_dummy = kzalloc(sizeof *p_dummy, GFP_KERNEL);
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if (!p_dummy)
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return -ENOMEM;
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dev_set_drvdata(&spi->dev, p_dummy);
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mutex_init(&p_dummy->lock);
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/* sysfs hook */
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status = device_create_file(&spi->dev, &dev_attr_looptest);
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if (status) {
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dev_dbg(&spi->dev, "device_create_file looptest failure.\n");
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goto out_dev_create_looptest_failed;
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}
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return 0;
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out_dev_create_looptest_failed:
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dev_set_drvdata(&spi->dev, NULL);
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kfree(p_dummy);
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return status;
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}
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static int __devexit pl022_dummy_remove(struct spi_device *spi)
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{
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struct dummy *p_dummy = dev_get_drvdata(&spi->dev);
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dev_info(&spi->dev, "removing dummy SPI device\n");
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device_remove_file(&spi->dev, &dev_attr_looptest);
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dev_set_drvdata(&spi->dev, NULL);
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kfree(p_dummy);
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return 0;
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}
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static struct spi_driver pl022_dummy_driver = {
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.driver = {
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.name = "spi-dummy",
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.owner = THIS_MODULE,
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},
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.probe = pl022_dummy_probe,
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.remove = __devexit_p(pl022_dummy_remove),
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};
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static int __init pl022_init_dummy(void)
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{
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return spi_register_driver(&pl022_dummy_driver);
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}
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static void __exit pl022_exit_dummy(void)
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{
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spi_unregister_driver(&pl022_dummy_driver);
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}
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module_init(pl022_init_dummy);
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module_exit(pl022_exit_dummy);
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MODULE_AUTHOR("Linus Walleij <linus.walleij@stericsson.com>");
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MODULE_DESCRIPTION("PL022 SSP/SPI DUMMY Linux driver");
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MODULE_LICENSE("GPL");
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124
arch/arm/mach-u300/spi.c
Normal file
124
arch/arm/mach-u300/spi.c
Normal file
@ -0,0 +1,124 @@
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/*
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* arch/arm/mach-u300/spi.c
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*
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* Copyright (C) 2009 ST-Ericsson AB
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* License terms: GNU General Public License (GPL) version 2
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*
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* Author: Linus Walleij <linus.walleij@stericsson.com>
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*/
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#include <linux/device.h>
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#include <linux/amba/bus.h>
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#include <linux/spi/spi.h>
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#include <linux/amba/pl022.h>
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#include <linux/err.h>
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#include "padmux.h"
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/*
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* The following is for the actual devices on the SSP/SPI bus
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*/
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#ifdef CONFIG_MACH_U300_SPIDUMMY
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static void select_dummy_chip(u32 chipselect)
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{
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pr_debug("CORE: %s called with CS=0x%x (%s)\n",
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__func__,
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chipselect,
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chipselect ? "unselect chip" : "select chip");
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/*
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* Here you would write the chip select value to the GPIO pins if
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* this was a real chip (but this is a loopback dummy).
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*/
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}
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struct pl022_config_chip dummy_chip_info = {
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/* Nominally this is LOOPBACK_DISABLED, but this is our dummy chip! */
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.lbm = LOOPBACK_ENABLED,
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/*
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* available POLLING_TRANSFER and INTERRUPT_TRANSFER,
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* DMA_TRANSFER does not work
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*/
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.com_mode = INTERRUPT_TRANSFER,
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.iface = SSP_INTERFACE_MOTOROLA_SPI,
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/* We can only act as master but SSP_SLAVE is possible in theory */
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.hierarchy = SSP_MASTER,
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/* 0 = drive TX even as slave, 1 = do not drive TX as slave */
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.slave_tx_disable = 0,
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/* LSB first */
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.endian_tx = SSP_TX_LSB,
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.endian_rx = SSP_RX_LSB,
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.data_size = SSP_DATA_BITS_8, /* used to be 12 in some default */
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.rx_lev_trig = SSP_RX_1_OR_MORE_ELEM,
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.tx_lev_trig = SSP_TX_1_OR_MORE_EMPTY_LOC,
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.clk_phase = SSP_CLK_FALLING_EDGE,
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.clk_pol = SSP_CLK_POL_IDLE_LOW,
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.ctrl_len = SSP_BITS_12,
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.wait_state = SSP_MWIRE_WAIT_ZERO,
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.duplex = SSP_MICROWIRE_CHANNEL_FULL_DUPLEX,
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/*
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* This is where you insert a call to a function to enable CS
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* (usually GPIO) for a certain chip.
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*/
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.cs_control = select_dummy_chip,
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};
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#endif
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static struct spi_board_info u300_spi_devices[] = {
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#ifdef CONFIG_MACH_U300_SPIDUMMY
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{
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/* A dummy chip used for loopback tests */
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.modalias = "spi-dummy",
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/* Really dummy, pass in additional chip config here */
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.platform_data = NULL,
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/* This defines how the controller shall handle the device */
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.controller_data = &dummy_chip_info,
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/* .irq - no external IRQ routed from this device */
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.max_speed_hz = 1000000,
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.bus_num = 0, /* Only one bus on this chip */
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.chip_select = 0,
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/* Means SPI_CS_HIGH, change if e.g low CS */
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.mode = 0,
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},
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#endif
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};
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|
||||
static struct pl022_ssp_controller ssp_platform_data = {
|
||||
/* If you have several SPI buses this varies, we have only bus 0 */
|
||||
.bus_id = 0,
|
||||
/* Set this to 1 when we think we got DMA working */
|
||||
.enable_dma = 0,
|
||||
/*
|
||||
* On the APP CPU GPIO 4, 5 and 6 are connected as generic
|
||||
* chip selects for SPI. (Same on U330, U335 and U365.)
|
||||
* TODO: make sure the GPIO driver can select these properly
|
||||
* and do padmuxing accordingly too.
|
||||
*/
|
||||
.num_chipselect = 3,
|
||||
};
|
||||
|
||||
|
||||
void __init u300_spi_init(struct amba_device *adev)
|
||||
{
|
||||
struct pmx *pmx;
|
||||
|
||||
adev->dev.platform_data = &ssp_platform_data;
|
||||
/*
|
||||
* Setup padmuxing for SPI. Since this must always be
|
||||
* compiled into the kernel, pmx is never released.
|
||||
*/
|
||||
pmx = pmx_get(&adev->dev, U300_APP_PMX_SPI_SETTING);
|
||||
|
||||
if (IS_ERR(pmx))
|
||||
dev_warn(&adev->dev, "Could not get padmux handle\n");
|
||||
else {
|
||||
int ret;
|
||||
|
||||
ret = pmx_activate(&adev->dev, pmx);
|
||||
if (IS_ERR_VALUE(ret))
|
||||
dev_warn(&adev->dev, "Could not activate padmuxing\n");
|
||||
}
|
||||
|
||||
}
|
||||
void __init u300_spi_register_board_devices(void)
|
||||
{
|
||||
/* Register any SPI devices */
|
||||
spi_register_board_info(u300_spi_devices, ARRAY_SIZE(u300_spi_devices));
|
||||
}
|
||||
26
arch/arm/mach-u300/spi.h
Normal file
26
arch/arm/mach-u300/spi.h
Normal file
@ -0,0 +1,26 @@
|
||||
/*
|
||||
* arch/arm/mach-u300/spi.h
|
||||
*
|
||||
* Copyright (C) 2009 ST-Ericsson AB
|
||||
* License terms: GNU General Public License (GPL) version 2
|
||||
*
|
||||
* Author: Linus Walleij <linus.walleij@stericsson.com>
|
||||
*/
|
||||
#ifndef SPI_H
|
||||
#define SPI_H
|
||||
#include <linux/amba/bus.h>
|
||||
|
||||
#ifdef CONFIG_SPI_PL022
|
||||
void __init u300_spi_init(struct amba_device *adev);
|
||||
void __init u300_spi_register_board_devices(void);
|
||||
#else
|
||||
/* Compile out SPI support if PL022 is not selected */
|
||||
static inline void __init u300_spi_init(struct amba_device *adev)
|
||||
{
|
||||
}
|
||||
static inline void __init u300_spi_register_board_devices(void)
|
||||
{
|
||||
}
|
||||
#endif
|
||||
|
||||
#endif
|
||||
Loading…
Reference in New Issue
Block a user