mirror of
git://projects.qi-hardware.com/openwrt-xburst.git
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343c185b7d
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@16547 3c298f89-4303-0410-b956-a3cf2f4a3e73
1379 lines
36 KiB
Diff
1379 lines
36 KiB
Diff
From 771f4741de2cd8a103d96cd1e8281926448ff56d Mon Sep 17 00:00:00 2001
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From: Kurt Mahan <kmahan@freescale.com>
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Date: Tue, 15 Jul 2008 11:44:08 -0600
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Subject: [PATCH] Fix DSPI driver.
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Update to latest Matt Coldfire driver. Fix timing issues with
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M547x/M548x END-OF-QUEUE notification.
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LTIBName: mcfv4e-dspi-update
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Signed-off-by: Kurt Mahan <kmahan@freescale.com>
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---
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arch/m68k/coldfire/m547x_8x-devices.c | 35 +-
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drivers/spi/Kconfig | 6 +
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drivers/spi/Makefile | 2 +-
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drivers/spi/dspi_mcf.c | 1217 +++++++++++++++++++++++++++++++++
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include/asm-m68k/mcfdspi.h | 48 ++
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5 files changed, 1296 insertions(+), 12 deletions(-)
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create mode 100644 drivers/spi/dspi_mcf.c
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create mode 100644 include/asm-m68k/mcfdspi.h
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--- a/arch/m68k/coldfire/m547x_8x-devices.c
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+++ b/arch/m68k/coldfire/m547x_8x-devices.c
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@@ -26,26 +26,40 @@
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*/
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/* number of supported SPI selects */
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-#define SPI_NUM_CHIPSELECTS 4
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+#define SPI_NUM_CHIPSELECTS 8
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void coldfire_spi_cs_control(u8 cs, u8 command)
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{
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/* nothing special required */
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}
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+#if defined(CONFIG_SPI_SPIDEV) || defined(CONFIG_SPI_SPIDEV_MODULE)
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+static struct coldfire_spi_chip spidev_chip_info = {
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+ .bits_per_word = 8,
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+};
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+#endif
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+
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static struct spi_board_info spi_board_info[] = {
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- /* no board info */
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+#if defined(CONFIG_SPI_SPIDEV) || defined(CONFIG_SPI_SPIDEV_MODULE)
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+ {
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+ .modalias = "spidev",
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+ .max_speed_hz = 16000000, /* max clk (SCK) speed in HZ */
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+ .bus_num = 1,
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+ .chip_select = 0, /* CS0 */
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+ .controller_data = &spidev_chip_info,
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+ }
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+#endif
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};
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static int spi_irq_list[] = {
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- /* IRQ, ICR Offset, ICR Val, Mask */
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- 64 + ISC_DSPI_OVRFW, 0, 0, 0,
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- 64 + ISC_DSPI_RFOF, 0, 0, 0,
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- 64 + ISC_DSPI_RFDF, 0, 0, 0,
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- 64 + ISC_DSPI_TFUF, 0, 0, 0,
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- 64 + ISC_DSPI_TCF, 0, 0, 0,
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- 64 + ISC_DSPI_TFFF, 0, 0, 0,
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- 64 + ISC_DSPI_EOQF, 0, 0, 0,
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+ /* IRQ, ICR Offset, ICR Val,Mask */
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+ 64 + ISC_DSPI_OVRFW, ISC_DSPI_OVRFW, 0x18, 0,
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+ 64 + ISC_DSPI_RFOF, ISC_DSPI_RFOF, 0x18, 0,
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+ 64 + ISC_DSPI_RFDF, ISC_DSPI_RFDF, 0x18, 0,
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+ 64 + ISC_DSPI_TFUF, ISC_DSPI_TFUF, 0x18, 0,
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+ 64 + ISC_DSPI_TCF, ISC_DSPI_TCF, 0x18, 0,
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+ 64 + ISC_DSPI_TFFF, ISC_DSPI_TFFF, 0x18, 0,
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+ 64 + ISC_DSPI_EOQF, ISC_DSPI_EOQF, 0x18, 0,
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0,0,0,0,
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};
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@@ -120,7 +134,6 @@ static int __init m547x_8x_spi_init(void
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/* register device */
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retval = platform_device_register(&coldfire_spi);
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if (retval < 0) {
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- printk(KERN_ERR "SPI-m547x_8x: platform_device_register failed with code=%d\n", retval);
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goto out;
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}
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--- a/drivers/spi/Kconfig
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+++ b/drivers/spi/Kconfig
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@@ -130,6 +130,12 @@ config SPI_COLDFIRE
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Tested with the 5282 processor, but should also work with other
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Coldfire variants.
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+config SPI_DSPI
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+ tristate "Coldfire DSPI"
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+ depends on SPI_MASTER && COLDFIRE
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+ help
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+ SPI driver for Coldfire DSPI driver only.
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+
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config SPI_COLDFIRE_DSPI_EDMA
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boolean "Coldfire DSPI master driver uses eDMA"
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depends on SPI_MASTER && COLDFIRE && SPI_COLDFIRE && EXPERIMENTAL && COLDFIRE_EDMA
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--- a/drivers/spi/Makefile
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+++ b/drivers/spi/Makefile
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@@ -19,7 +19,7 @@ obj-$(CONFIG_SPI_BITBANG) += spi_bitban
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obj-$(CONFIG_SPI_AU1550) += au1550_spi.o
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obj-$(CONFIG_SPI_BUTTERFLY) += spi_butterfly.o
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# obj-$(CONFIG_SPI_COLDFIRE) += spi_coldfire.o spi-m5445x.o
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-obj-$(CONFIG_SPI_COLDFIRE) += spi_coldfire.o
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+obj-$(CONFIG_SPI_DSPI) += dspi_mcf.o
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obj-$(CONFIG_SPI_GPIO) += spi_gpio.o
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obj-$(CONFIG_SPI_IMX) += spi_imx.o
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obj-$(CONFIG_SPI_LM70_LLP) += spi_lm70llp.o
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--- /dev/null
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+++ b/drivers/spi/dspi_mcf.c
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@@ -0,0 +1,1217 @@
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+/*
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+ * dspi_mcf.c - DSPI controller for ColdFire processors
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+ *
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+ *
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+ * Matt Waddel Matt.Waddel@freescale.com
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+ * Copyright Freescale Semiconductor, Inc. 2008
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+ *
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+ * M547x/M548x changes by Kurt Mahan kmahan@freescale.com
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+ * Copyright Freescale Semiconductor, Inc. 2008
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+ *
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+ * Based on spi_coldfire.c done by:
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+ * Andrey Butok
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+ * Yaroslav Vinogradov
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+ * Copyright Freescale Semiconductor, Inc. 2006-2007
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+ * Mike Lavender (mike@steroidmicros)
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+ * (C) Copyright 2005, Intec Automation,
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+ *
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+ * This program is free software; you can redistribute it and/or modify it
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+ * under the terms of the GNU General Public License as published by the
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+ * Free Software Foundation; either version 2 of the License, or (at your
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+ * option) any later version.
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+ *
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+ * This program is distributed in the hope that it will be useful,
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+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+ * GNU General Public License for more details.
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+ *
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+ * You should have received a copy of the GNU General Public License
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+ * along with this program; if not, write to the Free Software
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+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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+ *
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+ ***************************************************************************
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+ * Changes:
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+ * v0.002 M547x/M548x support.
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+ * v0.001 Initial version. Coldfire DSPI master driver.
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+ ****************************************************************************/
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+
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+/*
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+ * Includes
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+ */
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+
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+#include <linux/autoconf.h>
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+#include <linux/init.h>
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+#include <linux/module.h>
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+#include <linux/device.h>
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+#include <linux/interrupt.h>
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+#include <linux/platform_device.h>
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+#include <linux/spi/spi.h>
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+#include <linux/workqueue.h>
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+#include <linux/delay.h>
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+#include <asm/mcfsim.h>
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+#include <asm/mcfqspi.h>
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+#include <asm/coldfire.h>
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+#include <linux/io.h>
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+#include <asm/mcfdspi.h>
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+#include <linux/dma-mapping.h>
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+
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+#undef DSPI_COLDFIRE_DEBUG
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+
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+#ifdef DSPI_COLDFIRE_DEBUG
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+#define DBG(fmt, args...) \
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+ printk(KERN_INFO "[%s] " fmt , __FUNCTION__, ## args)
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+#else
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+#define DBG(fmt, args...) do {} while (0)
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+#endif
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+
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+#if defined(CONFIG_M54455)
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+#include <asm/mcf5445x_dspi.h>
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+#if defined(CONFIG_SPI_COLDFIRE_DSPI_EDMA)
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+ #include <asm/mcf5445x_edma.h>
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+#endif
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+#endif
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+
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+#if defined(CONFIG_M547X_8X)
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+#include <asm/virtconvert.h>
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+#include <asm/m5485dspi.h>
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+#endif
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+
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+#if defined(CONFIG_SPI_COLDFIRE_DSPI_EDMA)
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+#include <asm/mcf_edma.h>
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+#define SPI_DSPI_EDMA
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+#define EDMA_BUFSIZE_KMALLOC (DSPI_FIFO_SIZE*4)
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+#define DSPI_DMA_RX_TCD MCF_EDMA_CHAN_DSPI_RX
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+#define DSPI_DMA_TX_TCD MCF_EDMA_CHAN_DSPI_TX
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+#endif
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+
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+#define DSPI_BITS MCF_DSPI_DCTAR_FMSZ(0xF)
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+#define DSPI_BITS_16 MCF_DSPI_DCTAR_FMSZ(0xF)
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+#define DSPI_BITS_8 MCF_DSPI_DCTAR_FMSZ(0x7)
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+#define DSPI_FIFO_SIZE 16
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+
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+#define DRIVER_NAME "Coldfire DSPI"
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+
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+/****************************************************************************/
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+
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+/*
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+ * Local constants and macros
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+ */
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+
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+#define START_STATE ((void *)0)
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+#define RUNNING_STATE ((void *)1)
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+#define DONE_STATE ((void *)2)
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+#define ERROR_STATE ((void *)-1)
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+
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+#define QUEUE_RUNNING 0
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+#define QUEUE_STOPPED 1
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+
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+/****************************************************************************/
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+
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+/*
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+ * Local Data Structures
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+ */
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+
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+struct DSPI_MCR {
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+ unsigned master:1;
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+ unsigned cont_scke:1;
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+ unsigned dconf:2;
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+ unsigned frz:1;
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+ unsigned mtfe:1;
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+ unsigned pcsse:1;
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+ unsigned rooe:1;
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+ unsigned pcsis:8;
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+ unsigned reserved15:1;
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+ unsigned mdis:1;
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+ unsigned dis_tx:1;
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+ unsigned dis_rxf:1;
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+ unsigned clr_tx:1;
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+ unsigned clr_rxf:1;
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+ unsigned smpl_pt:2;
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+ unsigned reserved71:7;
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+ unsigned halt:1;
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+};
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+
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+struct DSPI_CTAR {
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+ unsigned dbr:1;
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+ unsigned fmsz:4;
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+ unsigned cpol:1;
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+ unsigned cpha:1;
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+ unsigned lsbfe:1;
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+ unsigned pcssck:2;
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+ unsigned pasc:2;
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+ unsigned pdt:2;
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+ unsigned pbr:2;
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+ unsigned cssck:4;
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+ unsigned asc:4;
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+ unsigned dt:4;
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+ unsigned br:4;
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+};
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+
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+struct chip_data {
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+ /* dspi data */
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+ union {
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+ u32 mcr_val;
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+ struct DSPI_MCR mcr;
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+ };
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+ union {
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+ u32 ctar_val;
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+ struct DSPI_CTAR ctar;
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+ };
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+ u16 void_write_data;
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+};
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+
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+
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+struct driver_data {
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+ /* Driver model hookup */
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+ struct platform_device *pdev;
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+
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+ /* SPI framework hookup */
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+ struct spi_master *master;
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+
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+ /* Driver message queue */
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+ struct workqueue_struct *workqueue;
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+ struct work_struct pump_messages;
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+ spinlock_t lock; /* lock */
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+ struct list_head queue;
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+ int busy;
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+ int run;
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+
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+ /* Message Transfer pump */
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+ struct tasklet_struct pump_transfers;
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+
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+ /* Current message transfer state info */
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+ struct spi_message *cur_msg;
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+ struct spi_transfer *cur_transfer;
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+ struct chip_data *cur_chip;
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+ size_t len;
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+ void *tx;
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+ void *tx_end;
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+ void *rx;
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+ void *rx_end;
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+ char flags;
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+#define TRAN_STATE_RX_VOID 0x01
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+#define TRAN_STATE_TX_VOID 0x02
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+#define TRAN_STATE_WORD_ODD_NUM 0x04
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+ u8 cs;
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+ u16 void_write_data;
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+ unsigned cs_change:1;
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+
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+ u32 trans_cnt;
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+ u32 wce_cnt;
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+ u32 abrt_cnt;
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+ u32 *mcr; /* DSPI MCR register */
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+ u32 *ctar; /* DSPI CTAR register */
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+ u32 *dspi_dtfr; /* DSPI DTFR register */
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+ u32 *dspi_drfr; /* DSPI DRFR register */
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+ u32 *dspi_rser; /* DSPI RSER register */
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+ u32 *dspi_sr; /* DSPI status register */
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+
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+#if defined(SPI_DSPI_EDMA)
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+ void *edma_tx_buf;
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+ void *edma_rx_buf;
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+#endif
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+
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+#if defined(CONFIG_M532x) || defined(CONFIG_M537x)
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+ u16 *par; /* Pin assignment register */
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+#else
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+ u8 *par; /* Pin assignment register */
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+#endif
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+ u8 *int_icr; /* Interrupt level and priority register */
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+ u32 *int_mr; /* Interrupt mask register */
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+ void (*cs_control)(u8 cs, u8 command);
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+};
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+
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+#define DSPI_CS(cs) ((1<<(cs))<<16)
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+
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+/****************************************************************************/
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+
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+/*
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+ * SPI local functions
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+ */
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+
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+static void *next_transfer(struct driver_data *drv_data)
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+{
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+ struct spi_message *msg = drv_data->cur_msg;
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+ struct spi_transfer *trans = drv_data->cur_transfer;
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+
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+ DBG("\n");
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+ /* Move to next transfer */
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+ if (trans->transfer_list.next != &msg->transfers) {
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+ drv_data->cur_transfer = list_entry(trans->transfer_list.next,
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+ struct spi_transfer,
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+ transfer_list);
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+
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+ if (drv_data->cur_transfer->transfer_list.next
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+ == &msg->transfers) /* last transfer */
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+ drv_data->cur_transfer->cs_change = 1;
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+
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+ return RUNNING_STATE;
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+ } else
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+ return DONE_STATE;
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+}
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+
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+
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+static inline int is_word_transfer(struct driver_data *drv_data)
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+{
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+ return ((*(drv_data->ctar+drv_data->cs) & DSPI_BITS_16) ==
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+ DSPI_BITS_8) ? 0 : 1;
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+}
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+
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+static inline void set_8bit_transfer_mode(struct driver_data *drv_data)
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+{
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+ DBG("\n");
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+ *(drv_data->ctar+drv_data->cs) =
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+ (*(drv_data->ctar + drv_data->cs) & ~DSPI_BITS) | DSPI_BITS_8;
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+}
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+
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+static inline void set_16bit_transfer_mode(struct driver_data *drv_data)
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+{
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+ DBG("\n");
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+ *(drv_data->ctar+drv_data->cs) =
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+ (*(drv_data->ctar + drv_data->cs) & ~DSPI_BITS) | DSPI_BITS_16;
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+}
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+
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+static unsigned char hz_to_spi_baud(int pbr, int dbr, int speed_hz)
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+{
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+ int pbr_tbl[4] = {2, 3, 5, 7}; /* Valid baud rate pre-scaler values */
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+ int brs[16] = { 2, 4, 6, 8,
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+ 16, 32, 64, 128,
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+ 256, 512, 1024, 2048,
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+ 4096, 8192, 16384, 32768 };
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+ int temp, index = 0;
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+
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+ if ((pbr < 0) || (pbr > 3) ||
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+ (dbr < 0) || (dbr > 1))
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+ return 15; /* table indexes out of range, go slow */
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+
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+ temp = ((((MCF_CLK / 2) / pbr_tbl[pbr]) * (1 + dbr)) / speed_hz);
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+
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+ while (temp >= brs[index])
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+ if (index++ >= 15)
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+ break;
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+
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+ DBG("baud rate scaler = 0x%x - %d\n", index, brs[index]);
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+ return(index);
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+}
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+
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+static int write(struct driver_data *drv_data)
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+{
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+ int tx_count = 0;
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+ int tx_word = is_word_transfer(drv_data);
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+ u16 d16;
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+ u8 d8;
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+ u32 dspi_pushr = 0;
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+ int first = 1;
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+#if defined(SPI_DSPI_EDMA)
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+ u32 *edma_wr = (u32 *)(drv_data->edma_tx_buf);
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+#endif
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+
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+ /* If we are in word mode, but only have a single byte to transfer
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+ * then switch to byte mode temporarily. Will switch back at the
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+ * end of the transfer. */
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+ if (tx_word && ((drv_data->tx_end - drv_data->tx) == 1)) {
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+ drv_data->flags |= TRAN_STATE_WORD_ODD_NUM;
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+ set_8bit_transfer_mode(drv_data);
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+ tx_word = 0;
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+ }
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+
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+ while ((drv_data->tx < drv_data->tx_end) && (tx_count < DSPI_FIFO_SIZE)) {
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+// DBG("while\n");
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+ if (tx_word) {
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+ if ((drv_data->tx_end - drv_data->tx) == 1)
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+ break;
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+
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+ if (!(drv_data->flags & TRAN_STATE_TX_VOID))
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+ d16 = *(u16 *)drv_data->tx;
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+ else
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+ d16 = drv_data->void_write_data;
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+
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+ dspi_pushr = MCF_DSPI_DTFR_TXDATA(d16) |
|
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+ DSPI_CS(drv_data->cs) |
|
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+ MCF_DSPI_DTFR_CTAS(drv_data->cs) |
|
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+ MCF_DSPI_DTFR_CONT;
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+
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+ drv_data->tx += 2;
|
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+ } else {
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+ if (!(drv_data->flags & TRAN_STATE_TX_VOID))
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+ d8 = *(u8 *)drv_data->tx;
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+ else
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|
+ d8 = *(u8 *)&drv_data->void_write_data;
|
|
+
|
|
+ dspi_pushr = MCF_DSPI_DTFR_TXDATA(d8) |
|
|
+ DSPI_CS(drv_data->cs) |
|
|
+ MCF_DSPI_DTFR_CTAS(drv_data->cs) |
|
|
+ MCF_DSPI_DTFR_CONT;
|
|
+
|
|
+ drv_data->tx++;
|
|
+ }
|
|
+
|
|
+ if (drv_data->tx == drv_data->tx_end
|
|
+ || tx_count == DSPI_FIFO_SIZE-1) {
|
|
+ /* last transfer in the queue */
|
|
+ dspi_pushr |= MCF_DSPI_DTFR_EOQ;
|
|
+ if ((drv_data->cs_change)
|
|
+ && (drv_data->tx == drv_data->tx_end))
|
|
+ dspi_pushr &= ~MCF_DSPI_DTFR_CONT;
|
|
+#ifdef CONFIG_M547X_8X
|
|
+ /* EOQ gets missed if we don't delay */
|
|
+ udelay(100);
|
|
+#endif
|
|
+ } else if (tx_word && ((drv_data->tx_end - drv_data->tx) == 1))
|
|
+ dspi_pushr |= MCF_DSPI_DTFR_EOQ;
|
|
+
|
|
+ if (first) {
|
|
+ first = 0;
|
|
+ dspi_pushr |= MCF_DSPI_DTFR_CTCNT; /* clear counter */
|
|
+ }
|
|
+#if defined(SPI_DSPI_EDMA)
|
|
+ *edma_wr = dspi_pushr;
|
|
+ edma_wr++;
|
|
+#else
|
|
+ *drv_data->dspi_dtfr = dspi_pushr;
|
|
+#endif
|
|
+ tx_count++;
|
|
+ }
|
|
+
|
|
+#if defined(SPI_DSPI_EDMA)
|
|
+ if (tx_count > 0) {
|
|
+
|
|
+ mcf_edma_set_tcd_params(DSPI_DMA_TX_TCD,
|
|
+ virt_to_phys(drv_data->edma_tx_buf),
|
|
+ (u32)drv_data->dspi_dtfr,
|
|
+ MCF_EDMA_TCD_ATTR_SSIZE_32BIT
|
|
+ | MCF_EDMA_TCD_ATTR_DSIZE_32BIT,
|
|
+ 4, /* soff */
|
|
+ 4 * tx_count, /* nbytes */
|
|
+ 0, /* slast */
|
|
+ 1, /* citer */
|
|
+ 1, /* biter */
|
|
+ 0, /* doff */
|
|
+ 0, /* dlastsga */
|
|
+ 0, /* major_int */
|
|
+ 1); /* disable_req */
|
|
+
|
|
+ mcf_edma_set_tcd_params(DSPI_DMA_RX_TCD,
|
|
+ (u32)drv_data->dspi_drfr,
|
|
+ virt_to_phys(drv_data->edma_rx_buf),
|
|
+ MCF_EDMA_TCD_ATTR_SSIZE_32BIT
|
|
+ | MCF_EDMA_TCD_ATTR_DSIZE_32BIT,
|
|
+ 0, /* soff */
|
|
+ 4 * tx_count, /* nbytes */
|
|
+ 0, /* slast */
|
|
+ 1, /* citer */
|
|
+ 1, /* biter */
|
|
+ 4, /* doff */
|
|
+ 0, /* dlastsga */
|
|
+ 0, /* major_int */
|
|
+ 1); /* disable_req */
|
|
+
|
|
+ mcf_edma_start_transfer(DSPI_DMA_TX_TCD);
|
|
+ }
|
|
+#endif
|
|
+ return (tx_count * (tx_word + 1));
|
|
+}
|
|
+
|
|
+static int read(struct driver_data *drv_data)
|
|
+{
|
|
+ int rx_count = 0;
|
|
+ int rx_word = is_word_transfer(drv_data);
|
|
+ u16 d;
|
|
+#if defined(SPI_DSPI_EDMA)
|
|
+ u32 *rx_edma = (u32 *) drv_data->edma_rx_buf;
|
|
+
|
|
+ /* receive SPI data */
|
|
+ mcf_edma_start_transfer(DSPI_DMA_RX_TCD);
|
|
+#endif
|
|
+ while ((drv_data->rx < drv_data->rx_end)
|
|
+ && (rx_count < DSPI_FIFO_SIZE)) {
|
|
+
|
|
+ if (rx_word) {
|
|
+ if ((drv_data->rx_end - drv_data->rx) == 1)
|
|
+ break;
|
|
+#if defined(SPI_DSPI_EDMA)
|
|
+ d = MCF_DSPI_DRFR_RXDATA(*rx_edma);
|
|
+ rx_edma++;
|
|
+#else
|
|
+ d = MCF_DSPI_DRFR_RXDATA(*drv_data->dspi_drfr);
|
|
+#endif
|
|
+ if (!(drv_data->flags & TRAN_STATE_RX_VOID))
|
|
+ *(u16 *)drv_data->rx = d;
|
|
+ drv_data->rx += 2;
|
|
+
|
|
+ } else {
|
|
+#if defined(SPI_DSPI_EDMA)
|
|
+ d = MCF_DSPI_DRFR_RXDATA(*rx_edma);
|
|
+ rx_edma++;
|
|
+#else
|
|
+ d = MCF_DSPI_DRFR_RXDATA(*drv_data->dspi_drfr);
|
|
+#endif
|
|
+ if (!(drv_data->flags & TRAN_STATE_RX_VOID))
|
|
+ *(u8 *)drv_data->rx = d;
|
|
+ drv_data->rx++;
|
|
+ }
|
|
+ rx_count++;
|
|
+ DBG("rxd=0x%x\n", d);
|
|
+ }
|
|
+ return rx_count;
|
|
+}
|
|
+
|
|
+
|
|
+static inline void dspi_setup_chip(struct driver_data *drv_data)
|
|
+{
|
|
+ struct chip_data *chip = drv_data->cur_chip;
|
|
+
|
|
+ DBG("\n");
|
|
+ *drv_data->mcr = chip->mcr_val;
|
|
+ *(drv_data->ctar+drv_data->cs) = chip->ctar_val;
|
|
+ *drv_data->dspi_rser = MCF_DSPI_DRSER_EOQFE;
|
|
+}
|
|
+
|
|
+#if defined(SPI_DSPI_EDMA)
|
|
+static int edma_tx_handler(int channel, void *dev)
|
|
+{
|
|
+ DBG("\n");
|
|
+ if (channel == DSPI_DMA_TX_TCD)
|
|
+ mcf_edma_stop_transfer(DSPI_DMA_TX_TCD);
|
|
+ return IRQ_HANDLED;
|
|
+}
|
|
+
|
|
+static int edma_rx_handler(int channel, void *dev)
|
|
+{
|
|
+ DBG("\n");
|
|
+ if (channel == DSPI_DMA_RX_TCD)
|
|
+ mcf_edma_stop_transfer(DSPI_DMA_RX_TCD);
|
|
+ return IRQ_HANDLED;
|
|
+}
|
|
+#endif
|
|
+
|
|
+static irqreturn_t dspi_interrupt(int irq, void *dev_id)
|
|
+{
|
|
+ struct driver_data *drv_data = (struct driver_data *)dev_id;
|
|
+ struct spi_message *msg = drv_data->cur_msg;
|
|
+
|
|
+ /* Clear all flags immediately */
|
|
+ *drv_data->dspi_sr = MCF_DSPI_DSR_EOQF;
|
|
+
|
|
+ if (!drv_data->cur_msg || !drv_data->cur_msg->state) {
|
|
+#if !defined(SPI_DSPI_EDMA)
|
|
+ u32 irq_status = *drv_data->dspi_sr;
|
|
+ /* if eDMA is used it happens some time (at least once)*/
|
|
+ printk(KERN_ERR "Bad message or transfer state handler. \
|
|
+ IRQ status = %x\n", irq_status);
|
|
+#endif
|
|
+ return IRQ_NONE;
|
|
+ }
|
|
+
|
|
+ DBG("\n");
|
|
+ /*
|
|
+ * Read the data into the buffer and reload and start
|
|
+ * queue with new data if not finished. If finished
|
|
+ * then setup the next transfer
|
|
+ */
|
|
+ read(drv_data);
|
|
+
|
|
+ if (drv_data->rx == drv_data->rx_end) {
|
|
+ /*
|
|
+ * Finished now - fall through and schedule next
|
|
+ * transfer tasklet
|
|
+ */
|
|
+ if (drv_data->flags & TRAN_STATE_WORD_ODD_NUM)
|
|
+ set_16bit_transfer_mode(drv_data);
|
|
+
|
|
+ msg->state = next_transfer(drv_data);
|
|
+ } else {
|
|
+ /* not finished yet - keep going */
|
|
+ msg->actual_length += write(drv_data);
|
|
+ return IRQ_HANDLED;
|
|
+ }
|
|
+
|
|
+ tasklet_schedule(&drv_data->pump_transfers);
|
|
+
|
|
+ return IRQ_HANDLED;
|
|
+}
|
|
+
|
|
+/* caller already set message->status; dma and pio irqs are blocked */
|
|
+static void giveback(struct driver_data *drv_data)
|
|
+{
|
|
+ struct spi_transfer *last_transfer;
|
|
+ unsigned long flags;
|
|
+ struct spi_message *msg;
|
|
+ DBG("\n");
|
|
+
|
|
+ spin_lock_irqsave(&drv_data->lock, flags);
|
|
+ msg = drv_data->cur_msg;
|
|
+ drv_data->cur_msg = NULL;
|
|
+ drv_data->cur_transfer = NULL;
|
|
+ drv_data->cur_chip = NULL;
|
|
+ queue_work(drv_data->workqueue, &drv_data->pump_messages);
|
|
+ spin_unlock_irqrestore(&drv_data->lock, flags);
|
|
+
|
|
+ last_transfer = list_entry(msg->transfers.prev,
|
|
+ struct spi_transfer, transfer_list);
|
|
+
|
|
+ if (!last_transfer->cs_change)
|
|
+ drv_data->cs_control(drv_data->cs, QSPI_CS_DROP);
|
|
+
|
|
+ msg->state = NULL;
|
|
+ if (msg->complete)
|
|
+ msg->complete(msg->context);
|
|
+}
|
|
+
|
|
+
|
|
+static void pump_transfers(unsigned long data)
|
|
+{
|
|
+ struct driver_data *drv_data = (struct driver_data *)data;
|
|
+ struct spi_message *message = NULL;
|
|
+ struct spi_transfer *transfer = NULL;
|
|
+ struct spi_transfer *previous = NULL;
|
|
+ struct chip_data *chip = NULL;
|
|
+ unsigned long flags;
|
|
+ DBG("\n");
|
|
+ /* Get current state information */
|
|
+ message = drv_data->cur_msg;
|
|
+ transfer = drv_data->cur_transfer;
|
|
+ chip = drv_data->cur_chip;
|
|
+
|
|
+ /* Handle for abort */
|
|
+ if (message->state == ERROR_STATE) {
|
|
+ message->status = -EIO;
|
|
+ giveback(drv_data);
|
|
+ return;
|
|
+ }
|
|
+
|
|
+ /* Handle end of message */
|
|
+ if (message->state == DONE_STATE) {
|
|
+ message->status = 0;
|
|
+ giveback(drv_data);
|
|
+ return;
|
|
+ }
|
|
+
|
|
+ if (message->state == START_STATE) {
|
|
+ dspi_setup_chip(drv_data);
|
|
+
|
|
+ if (drv_data->cs_control)
|
|
+ drv_data->cs_control(message->spi->chip_select,
|
|
+ QSPI_CS_ASSERT);
|
|
+ }
|
|
+
|
|
+ /* Delay if requested at end of transfer*/
|
|
+ if (message->state == RUNNING_STATE) {
|
|
+ previous = list_entry(transfer->transfer_list.prev,
|
|
+ struct spi_transfer,
|
|
+ transfer_list);
|
|
+
|
|
+ if (drv_data->cs_control && transfer->cs_change)
|
|
+ drv_data->cs_control(message->spi->chip_select,
|
|
+ QSPI_CS_DROP);
|
|
+
|
|
+ if (previous->delay_usecs)
|
|
+ udelay(previous->delay_usecs);
|
|
+
|
|
+ if (drv_data->cs_control && transfer->cs_change)
|
|
+ drv_data->cs_control(message->spi->chip_select,
|
|
+ QSPI_CS_ASSERT);
|
|
+ }
|
|
+
|
|
+ drv_data->flags = 0;
|
|
+ drv_data->tx = (void *)transfer->tx_buf;
|
|
+ drv_data->tx_end = drv_data->tx + transfer->len;
|
|
+ drv_data->rx = transfer->rx_buf;
|
|
+ drv_data->rx_end = drv_data->rx + transfer->len;
|
|
+
|
|
+ if (!drv_data->rx)
|
|
+ drv_data->flags |= TRAN_STATE_RX_VOID;
|
|
+ if (!drv_data->tx)
|
|
+ drv_data->flags |= TRAN_STATE_TX_VOID;
|
|
+ drv_data->cs = message->spi->chip_select;
|
|
+ drv_data->cs_change = transfer->cs_change;
|
|
+ drv_data->void_write_data = chip->void_write_data;
|
|
+ if (transfer->speed_hz) {
|
|
+ *(drv_data->ctar + drv_data->cs) = \
|
|
+ ((chip->ctar_val & ~0xF) | \
|
|
+ hz_to_spi_baud(chip->ctar.pbr, \
|
|
+ chip->ctar.dbr, \
|
|
+ transfer->speed_hz));
|
|
+ }
|
|
+
|
|
+ message->state = RUNNING_STATE;
|
|
+ /* Go baby, go */
|
|
+ local_irq_save(flags);
|
|
+ message->actual_length += write(drv_data);
|
|
+ local_irq_restore(flags);
|
|
+}
|
|
+
|
|
+
|
|
+static void pump_messages(struct work_struct *work)
|
|
+{
|
|
+ struct driver_data *drv_data;
|
|
+ unsigned long flags;
|
|
+ DBG("\n");
|
|
+
|
|
+ drv_data = container_of(work, struct driver_data, pump_messages);
|
|
+
|
|
+ /* Lock queue and check for queue work */
|
|
+ spin_lock_irqsave(&drv_data->lock, flags);
|
|
+ if (list_empty(&drv_data->queue)
|
|
+ || drv_data->run == QUEUE_STOPPED) {
|
|
+ drv_data->busy = 0;
|
|
+ spin_unlock_irqrestore(&drv_data->lock, flags);
|
|
+ return;
|
|
+ }
|
|
+
|
|
+ /* Make sure we are not already running a message */
|
|
+ if (drv_data->cur_msg) {
|
|
+ spin_unlock_irqrestore(&drv_data->lock, flags);
|
|
+ return;
|
|
+ }
|
|
+
|
|
+ /* Extract head of queue */
|
|
+ drv_data->cur_msg = list_entry(drv_data->queue.next,
|
|
+ struct spi_message, queue);
|
|
+ list_del_init(&drv_data->cur_msg->queue);
|
|
+
|
|
+ /* Initial message state*/
|
|
+ drv_data->cur_msg->state = START_STATE;
|
|
+ drv_data->cur_transfer = list_entry(drv_data->cur_msg->transfers.next,
|
|
+ struct spi_transfer,
|
|
+ transfer_list);
|
|
+
|
|
+ if (drv_data->cur_transfer->transfer_list.next
|
|
+ == &drv_data->cur_msg->transfers)
|
|
+ drv_data->cur_transfer->cs_change = 1; /* last */
|
|
+
|
|
+
|
|
+ /* Setup the SPI Registers using the per chip configuration */
|
|
+ drv_data->cur_chip = spi_get_ctldata(drv_data->cur_msg->spi);
|
|
+
|
|
+ /* Mark as busy and launch transfers */
|
|
+ tasklet_schedule(&drv_data->pump_transfers);
|
|
+
|
|
+ drv_data->busy = 1;
|
|
+ spin_unlock_irqrestore(&drv_data->lock, flags);
|
|
+}
|
|
+
|
|
+/****************************************************************************/
|
|
+
|
|
+/*
|
|
+ * SPI master implementation
|
|
+ */
|
|
+
|
|
+static int transfer(struct spi_device *spi, struct spi_message *msg)
|
|
+{
|
|
+ struct driver_data *drv_data = spi_master_get_devdata(spi->master);
|
|
+ unsigned long flags;
|
|
+
|
|
+ DBG("\n");
|
|
+ spin_lock_irqsave(&drv_data->lock, flags);
|
|
+
|
|
+ if (drv_data->run == QUEUE_STOPPED) {
|
|
+ spin_unlock_irqrestore(&drv_data->lock, flags);
|
|
+ return -ESHUTDOWN;
|
|
+ }
|
|
+
|
|
+ msg->actual_length = 0;
|
|
+ msg->status = -EINPROGRESS;
|
|
+ msg->state = START_STATE;
|
|
+
|
|
+ list_add_tail(&msg->queue, &drv_data->queue);
|
|
+
|
|
+ if (drv_data->run == QUEUE_RUNNING && !drv_data->busy)
|
|
+ queue_work(drv_data->workqueue, &drv_data->pump_messages);
|
|
+
|
|
+ spin_unlock_irqrestore(&drv_data->lock, flags);
|
|
+
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+
|
|
+static int setup(struct spi_device *spi)
|
|
+{
|
|
+
|
|
+ struct chip_data *chip;
|
|
+ struct coldfire_dspi_chip *chip_info
|
|
+ = (struct coldfire_dspi_chip *)spi->controller_data;
|
|
+ DBG("\n");
|
|
+
|
|
+ /* Only alloc on first setup */
|
|
+ chip = spi_get_ctldata(spi);
|
|
+ if (chip == NULL) {
|
|
+ chip = kcalloc(1, sizeof(struct chip_data), GFP_KERNEL);
|
|
+ if (!chip)
|
|
+ return -ENOMEM;
|
|
+ spi->mode = chip_info->mode;
|
|
+ spi->bits_per_word = chip_info->bits_per_word;
|
|
+ }
|
|
+
|
|
+ chip->mcr.master = 1;
|
|
+ chip->mcr.cont_scke = 0;
|
|
+ chip->mcr.dconf = 0;
|
|
+ chip->mcr.frz = 0;
|
|
+ chip->mcr.mtfe = 0;
|
|
+ chip->mcr.pcsse = 0;
|
|
+ chip->mcr.rooe = 0;
|
|
+ chip->mcr.pcsis = 0xFF;
|
|
+ chip->mcr.reserved15 = 0;
|
|
+ chip->mcr.mdis = 0;
|
|
+ chip->mcr.dis_tx = 0;
|
|
+ chip->mcr.dis_rxf = 0;
|
|
+ chip->mcr.clr_tx = 1;
|
|
+ chip->mcr.clr_rxf = 1;
|
|
+ chip->mcr.smpl_pt = 0;
|
|
+ chip->mcr.reserved71 = 0;
|
|
+ chip->mcr.halt = 0;
|
|
+
|
|
+ if ((spi->bits_per_word >= 4) && (spi->bits_per_word <= 16)) {
|
|
+ chip->ctar.fmsz = spi->bits_per_word-1;
|
|
+ } else {
|
|
+ printk(KERN_ERR "Invalid wordsize\n");
|
|
+ kfree(chip);
|
|
+ return -ENODEV;
|
|
+ }
|
|
+
|
|
+ chip->void_write_data = chip_info->void_write_data;
|
|
+
|
|
+ if (spi->max_speed_hz != 0)
|
|
+ chip_info->br = hz_to_spi_baud(chip_info->pbr, chip_info->dbr, \
|
|
+ spi->max_speed_hz);
|
|
+
|
|
+ chip->ctar.cpha = (spi->mode & SPI_CPHA) ? 1 : 0;
|
|
+ chip->ctar.cpol = (spi->mode & SPI_CPOL) ? 1 : 0;
|
|
+ chip->ctar.lsbfe = (spi->mode & SPI_LSB_FIRST) ? 1 : 0;
|
|
+ chip->ctar.dbr = chip_info->dbr;
|
|
+ chip->ctar.pbr = chip_info->pbr;
|
|
+ chip->ctar.br = chip_info->br;
|
|
+ chip->ctar.pcssck = chip_info->pcssck;
|
|
+ chip->ctar.pasc = chip_info->pasc;
|
|
+ chip->ctar.pdt = chip_info->pdt;
|
|
+ chip->ctar.cssck = chip_info->cssck;
|
|
+ chip->ctar.asc = chip_info->asc;
|
|
+ chip->ctar.dt = chip_info->dt;
|
|
+
|
|
+ spi_set_ctldata(spi, chip);
|
|
+
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+static int init_queue(struct driver_data *drv_data)
|
|
+{
|
|
+ INIT_LIST_HEAD(&drv_data->queue);
|
|
+ spin_lock_init(&drv_data->lock);
|
|
+
|
|
+ drv_data->run = QUEUE_STOPPED;
|
|
+ drv_data->busy = 0;
|
|
+
|
|
+ tasklet_init(&drv_data->pump_transfers,
|
|
+ pump_transfers, (unsigned long)drv_data);
|
|
+
|
|
+ INIT_WORK(&drv_data->pump_messages, pump_messages);
|
|
+
|
|
+ drv_data->workqueue = create_singlethread_workqueue(
|
|
+ drv_data->master->dev.parent->bus_id);
|
|
+ if (drv_data->workqueue == NULL)
|
|
+ return -EBUSY;
|
|
+
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+static int start_queue(struct driver_data *drv_data)
|
|
+{
|
|
+ unsigned long flags;
|
|
+
|
|
+ spin_lock_irqsave(&drv_data->lock, flags);
|
|
+
|
|
+ if (drv_data->run == QUEUE_RUNNING || drv_data->busy) {
|
|
+ spin_unlock_irqrestore(&drv_data->lock, flags);
|
|
+ return -EBUSY;
|
|
+ }
|
|
+
|
|
+ drv_data->run = QUEUE_RUNNING;
|
|
+ drv_data->cur_msg = NULL;
|
|
+ drv_data->cur_transfer = NULL;
|
|
+ drv_data->cur_chip = NULL;
|
|
+ spin_unlock_irqrestore(&drv_data->lock, flags);
|
|
+
|
|
+ queue_work(drv_data->workqueue, &drv_data->pump_messages);
|
|
+
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+static int stop_queue(struct driver_data *drv_data)
|
|
+{
|
|
+ unsigned long flags;
|
|
+ unsigned limit = 500;
|
|
+ int status = 0;
|
|
+
|
|
+ spin_lock_irqsave(&drv_data->lock, flags);
|
|
+
|
|
+ /* This is a bit lame, but is optimized for the common execution path.
|
|
+ * A wait_queue on the drv_data->busy could be used, but then the common
|
|
+ * execution path (pump_messages) would be required to call wake_up or
|
|
+ * friends on every SPI message. Do this instead */
|
|
+ drv_data->run = QUEUE_STOPPED;
|
|
+ while (!list_empty(&drv_data->queue) && drv_data->busy && limit--) {
|
|
+ spin_unlock_irqrestore(&drv_data->lock, flags);
|
|
+ msleep(10);
|
|
+ spin_lock_irqsave(&drv_data->lock, flags);
|
|
+ }
|
|
+
|
|
+ if (!list_empty(&drv_data->queue) || drv_data->busy)
|
|
+ status = -EBUSY;
|
|
+
|
|
+ spin_unlock_irqrestore(&drv_data->lock, flags);
|
|
+
|
|
+ return status;
|
|
+}
|
|
+
|
|
+static int destroy_queue(struct driver_data *drv_data)
|
|
+{
|
|
+ int status;
|
|
+
|
|
+ status = stop_queue(drv_data);
|
|
+ if (status != 0)
|
|
+ return status;
|
|
+
|
|
+ destroy_workqueue(drv_data->workqueue);
|
|
+
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+
|
|
+static void cleanup(struct spi_device *spi)
|
|
+{
|
|
+ struct chip_data *chip = spi_get_ctldata((struct spi_device *)spi);
|
|
+
|
|
+ dev_dbg(&spi->dev, "spi_device %u.%u cleanup\n",
|
|
+ spi->master->bus_num, spi->chip_select);
|
|
+
|
|
+ kfree(chip);
|
|
+}
|
|
+
|
|
+
|
|
+/****************************************************************************/
|
|
+
|
|
+/*
|
|
+ * Generic Device driver routines and interface implementation
|
|
+ */
|
|
+
|
|
+static int coldfire_spi_probe(struct platform_device *pdev)
|
|
+{
|
|
+ struct device *dev = &pdev->dev;
|
|
+ struct coldfire_spi_master *platform_info;
|
|
+ struct spi_master *master;
|
|
+ struct driver_data *drv_data = 0;
|
|
+ struct resource *memory_resource;
|
|
+ int irq;
|
|
+ int status = 0;
|
|
+ int i;
|
|
+#if defined(SPI_DSPI_EDMA)
|
|
+ dma_addr_t dma_handle;
|
|
+#endif
|
|
+
|
|
+ platform_info = (struct coldfire_spi_master *)dev->platform_data;
|
|
+
|
|
+ master = spi_alloc_master(dev, sizeof(struct driver_data));
|
|
+ if (!master)
|
|
+ return -ENOMEM;
|
|
+
|
|
+ drv_data = spi_master_get_devdata(master);
|
|
+ drv_data->master = master;
|
|
+
|
|
+ INIT_LIST_HEAD(&drv_data->queue);
|
|
+ spin_lock_init(&drv_data->lock);
|
|
+
|
|
+ master->bus_num = platform_info->bus_num;
|
|
+ master->num_chipselect = platform_info->num_chipselect;
|
|
+ master->cleanup = cleanup;
|
|
+ master->setup = setup;
|
|
+ master->transfer = transfer;
|
|
+
|
|
+ drv_data->cs_control = platform_info->cs_control;
|
|
+ if (drv_data->cs_control)
|
|
+ for (i = 0; i < master->num_chipselect; i++)
|
|
+ drv_data->cs_control(i, QSPI_CS_INIT | QSPI_CS_DROP);
|
|
+
|
|
+ /* Setup register addresses */
|
|
+ memory_resource = platform_get_resource_byname(pdev,
|
|
+ IORESOURCE_MEM, "spi-module");
|
|
+ if (!memory_resource) {
|
|
+ dev_dbg(dev, "can not find platform module memory\n");
|
|
+ goto out_error_master_alloc;
|
|
+ }
|
|
+
|
|
+#if defined(SPI_DSPI_EDMA)
|
|
+ drv_data->edma_tx_buf = dma_alloc_coherent(NULL, EDMA_BUFSIZE_KMALLOC, \
|
|
+ &dma_handle, GFP_DMA);
|
|
+ if (!drv_data->edma_tx_buf) {
|
|
+ dev_dbg(dev, "cannot allocate eDMA TX memory\n");
|
|
+ goto out_error_master_alloc;
|
|
+ }
|
|
+ drv_data->edma_rx_buf = dma_alloc_coherent(NULL, EDMA_BUFSIZE_KMALLOC, \
|
|
+ &dma_handle, GFP_DMA);
|
|
+ if (!drv_data->edma_rx_buf) {
|
|
+ dma_free_coherent(NULL, EDMA_BUFSIZE_KMALLOC, \
|
|
+ drv_data->edma_tx_buf, dma_handle);
|
|
+ kfree(drv_data->edma_tx_buf);
|
|
+ dev_dbg(dev, "cannot allocate eDMA RX memory\n");
|
|
+ goto out_error_master_alloc;
|
|
+ }
|
|
+#endif
|
|
+
|
|
+ drv_data->mcr = (void *)&MCF_DSPI_DMCR;
|
|
+ drv_data->ctar = (void *)&MCF_DSPI_DCTAR0;
|
|
+ drv_data->dspi_sr = (void *)&MCF_DSPI_DSR;
|
|
+ drv_data->dspi_rser = (void *)&MCF_DSPI_DRSER;
|
|
+ drv_data->dspi_dtfr = (void *)&MCF_DSPI_DTFR;
|
|
+ drv_data->dspi_drfr = (void *)&MCF_DSPI_DRFR;
|
|
+
|
|
+ memory_resource = platform_get_resource_byname(pdev, IORESOURCE_MEM,
|
|
+ "spi-par");
|
|
+ if (!memory_resource) {
|
|
+ dev_dbg(dev, "No spi-par memory\n");
|
|
+ goto out_error_master_alloc;
|
|
+ }
|
|
+ drv_data->par = (void *)memory_resource->start;
|
|
+
|
|
+ memory_resource = platform_get_resource_byname(pdev, IORESOURCE_MEM,
|
|
+ "spi-int-level");
|
|
+ if (!memory_resource) {
|
|
+ dev_dbg(dev, "No spi-int-level memory\n");
|
|
+ goto out_error_master_alloc;
|
|
+ }
|
|
+ drv_data->int_icr = (void *)memory_resource->start;
|
|
+
|
|
+ memory_resource = platform_get_resource_byname(pdev, IORESOURCE_MEM,
|
|
+ "spi-int-mask");
|
|
+ if (!memory_resource) {
|
|
+ dev_dbg(dev, "No spi-int-mask memory\n");
|
|
+ goto out_error_master_alloc;
|
|
+ }
|
|
+ drv_data->int_mr = (void *)memory_resource->start;
|
|
+
|
|
+ if (platform_info->irq_list) {
|
|
+ /* multiple IRQs */
|
|
+ int *irqlist = platform_info->irq_list;
|
|
+ while ((irq = *irqlist++)) {
|
|
+ int off = *irqlist++;
|
|
+ int lvl = *irqlist++;
|
|
+ int msk = *irqlist++;
|
|
+ status = request_irq(irq, dspi_interrupt, IRQF_DISABLED,
|
|
+ dev->bus_id, drv_data);
|
|
+ if (status < 0) {
|
|
+ dev_err(&pdev->dev,
|
|
+ "Unable to attach ColdFire DSPI interrupt\n");
|
|
+ goto out_error_master_alloc;
|
|
+ }
|
|
+
|
|
+ if (lvl)
|
|
+ *(drv_data->int_icr + off) = lvl;
|
|
+
|
|
+ if (msk)
|
|
+ *drv_data->int_mr &= ~msk;
|
|
+ }
|
|
+ }
|
|
+ else {
|
|
+ irq = platform_info->irq_vector;
|
|
+
|
|
+ status = request_irq(platform_info->irq_vector, dspi_interrupt,
|
|
+ IRQF_DISABLED, dev->bus_id, drv_data);
|
|
+ if (status < 0) {
|
|
+ dev_err(&pdev->dev, "Unable to attach ColdFire DSPI interrupt\n");
|
|
+ goto out_error_master_alloc;
|
|
+ }
|
|
+
|
|
+ *drv_data->int_icr = platform_info->irq_lp;
|
|
+ *drv_data->int_mr &= ~platform_info->irq_mask;
|
|
+ }
|
|
+
|
|
+ /* Now that we have all the addresses etc. Let's set it up */
|
|
+ if (platform_info->par_val)
|
|
+ *drv_data->par = platform_info->par_val;
|
|
+
|
|
+ /* Initial and start queue */
|
|
+ status = init_queue(drv_data);
|
|
+ if (status != 0) {
|
|
+ dev_err(&pdev->dev, "Problem initializing DSPI queue\n");
|
|
+ goto out_error_irq_alloc;
|
|
+ }
|
|
+ status = start_queue(drv_data);
|
|
+ if (status != 0) {
|
|
+ dev_err(&pdev->dev, "Problem starting DSPI queue\n");
|
|
+ goto out_error_irq_alloc;
|
|
+ }
|
|
+
|
|
+ /* Register with the SPI framework */
|
|
+ platform_set_drvdata(pdev, drv_data);
|
|
+ status = spi_register_master(master);
|
|
+ if (status != 0) {
|
|
+ dev_err(&pdev->dev, "Problem registering DSPI master\n");
|
|
+ status = -EINVAL;
|
|
+ goto out_error_queue_alloc;
|
|
+ }
|
|
+
|
|
+#if defined(SPI_DSPI_EDMA)
|
|
+ if (mcf_edma_request_channel(DSPI_DMA_TX_TCD,
|
|
+ edma_tx_handler,
|
|
+ NULL,
|
|
+ 0x0,
|
|
+ pdev,
|
|
+ NULL, /* spinlock */
|
|
+ DRIVER_NAME) < 0){
|
|
+ dev_err(&pdev->dev, "eDMA transmit channel request\n");
|
|
+ status = -EINVAL;
|
|
+ goto out_error_queue_alloc;
|
|
+ }
|
|
+
|
|
+ if (mcf_edma_request_channel(DSPI_DMA_RX_TCD,
|
|
+ edma_rx_handler,
|
|
+ NULL,
|
|
+ 0x0,
|
|
+ pdev,
|
|
+ NULL, /* spinlock */
|
|
+ DRIVER_NAME) < 0){
|
|
+ dev_err(&pdev->dev, "eDAM receive channel request\n");
|
|
+ status = -EINVAL;
|
|
+ mcf_edma_free_channel(DSPI_DMA_TX_TCD, pdev);
|
|
+ goto out_error_queue_alloc;
|
|
+ }
|
|
+#endif
|
|
+
|
|
+ printk(KERN_INFO "DSPI: Coldfire master initialized\n");
|
|
+ return status;
|
|
+
|
|
+out_error_queue_alloc:
|
|
+ destroy_queue(drv_data);
|
|
+
|
|
+out_error_irq_alloc:
|
|
+ free_irq(platform_info->irq_vector, drv_data);
|
|
+
|
|
+out_error_master_alloc:
|
|
+ spi_master_put(master);
|
|
+ return status;
|
|
+
|
|
+}
|
|
+
|
|
+static int coldfire_spi_remove(struct platform_device *pdev)
|
|
+{
|
|
+ struct driver_data *drv_data = platform_get_drvdata(pdev);
|
|
+ int irq;
|
|
+ int status = 0;
|
|
+
|
|
+ if (!drv_data)
|
|
+ return 0;
|
|
+
|
|
+#if defined(SPI_DSPI_EDMA)
|
|
+ mcf_edma_free_channel(DSPI_DMA_TX_TCD, pdev);
|
|
+ mcf_edma_free_channel(DSPI_DMA_RX_TCD, pdev);
|
|
+#endif
|
|
+
|
|
+ /* Remove the queue */
|
|
+ status = destroy_queue(drv_data);
|
|
+ if (status != 0)
|
|
+ return status;
|
|
+
|
|
+ /* Release IRQ */
|
|
+ irq = platform_get_irq(pdev, 0);
|
|
+ if (irq >= 0)
|
|
+ free_irq(irq, drv_data);
|
|
+
|
|
+ /* Disconnect from the SPI framework */
|
|
+ spi_unregister_master(drv_data->master);
|
|
+
|
|
+ /* Prevent double remove */
|
|
+ platform_set_drvdata(pdev, NULL);
|
|
+
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+static void coldfire_spi_shutdown(struct platform_device *pdev)
|
|
+{
|
|
+ int status = coldfire_spi_remove(pdev);
|
|
+
|
|
+ if (status != 0)
|
|
+ dev_err(&pdev->dev, "shutdown failed with %d\n", status);
|
|
+}
|
|
+
|
|
+
|
|
+#ifdef CONFIG_PM
|
|
+static int suspend_devices(struct device *dev, void *pm_message)
|
|
+{
|
|
+ pm_message_t *state = pm_message;
|
|
+
|
|
+ if (dev->power.power_state.event != state->event) {
|
|
+ dev_warn(dev, "pm state does not match request\n");
|
|
+ return -1;
|
|
+ }
|
|
+
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+static int coldfire_spi_suspend(struct platform_device *pdev,
|
|
+ pm_message_t state)
|
|
+{
|
|
+ struct driver_data *drv_data = platform_get_drvdata(pdev);
|
|
+ int status = 0;
|
|
+
|
|
+ /* Check all childern for current power state */
|
|
+ if (device_for_each_child(&pdev->dev,
|
|
+ &state, suspend_devices) != 0) {
|
|
+ dev_warn(&pdev->dev, "suspend aborted\n");
|
|
+ return -1;
|
|
+ }
|
|
+
|
|
+ status = stop_queue(drv_data);
|
|
+ if (status != 0)
|
|
+ return status;
|
|
+
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+static int coldfire_spi_resume(struct platform_device *pdev)
|
|
+{
|
|
+ struct driver_data *drv_data = platform_get_drvdata(pdev);
|
|
+ int status = 0;
|
|
+
|
|
+ /* Start the queue running */
|
|
+ status = start_queue(drv_data);
|
|
+ if (status != 0) {
|
|
+ dev_err(&pdev->dev, "problem starting queue (%d)\n", status);
|
|
+ return status;
|
|
+ }
|
|
+
|
|
+ return 0;
|
|
+}
|
|
+#else
|
|
+#define coldfire_spi_suspend NULL
|
|
+#define coldfire_spi_resume NULL
|
|
+#endif /* CONFIG_PM */
|
|
+
|
|
+static struct platform_driver driver = {
|
|
+ .driver = {
|
|
+ .name = "spi_coldfire",
|
|
+ .bus = &platform_bus_type,
|
|
+ .owner = THIS_MODULE,
|
|
+ },
|
|
+ .probe = coldfire_spi_probe,
|
|
+ .remove = __devexit_p(coldfire_spi_remove),
|
|
+ .shutdown = coldfire_spi_shutdown,
|
|
+ .suspend = coldfire_spi_suspend,
|
|
+ .resume = coldfire_spi_resume,
|
|
+};
|
|
+
|
|
+static int __init coldfire_spi_init(void)
|
|
+{
|
|
+ platform_driver_register(&driver);
|
|
+
|
|
+ return 0;
|
|
+}
|
|
+module_init(coldfire_spi_init);
|
|
+
|
|
+static void __exit coldfire_spi_exit(void)
|
|
+{
|
|
+ platform_driver_unregister(&driver);
|
|
+}
|
|
+module_exit(coldfire_spi_exit);
|
|
+
|
|
+MODULE_AUTHOR("Matt Waddel");
|
|
+MODULE_DESCRIPTION("ColdFire DSPI Contoller");
|
|
+MODULE_LICENSE("GPL");
|
|
--- /dev/null
|
|
+++ b/include/asm-m68k/mcfdspi.h
|
|
@@ -0,0 +1,48 @@
|
|
+/*
|
|
+ * mcfdspi.h-DSPI controller for the ColdFire processors.
|
|
+ *
|
|
+ * Andrey Butok
|
|
+ * Copyright Freescale Semiconductor, Inc. 2008
|
|
+ *
|
|
+ * This file is based on mcfqspi.h
|
|
+ *
|
|
+ * This program is free software; you can redistribute it and/or modify it
|
|
+ * under the terms of the GNU General Public License as published by the
|
|
+ * Free Software Foundation; either version 2 of the License, or (at your
|
|
+ * option) any later version.
|
|
+ *
|
|
+ * This program is distributed in the hope that it will be useful,
|
|
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
+ * GNU General Public License for more details.
|
|
+ *
|
|
+ * You should have received a copy of the GNU General Public License
|
|
+ * along with this program; if not, write to the Free Software
|
|
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
+ *
|
|
+ ***************************************************************************
|
|
+ * Changes:
|
|
+ * v0.001 25 March 2008 Andrey Butok
|
|
+ * Initial Release - developed on uClinux with 2.6.23 kernel.
|
|
+ *
|
|
+ */
|
|
+
|
|
+#ifndef MCFDSPI_H_
|
|
+#define MCFDSPI_H_
|
|
+
|
|
+struct coldfire_dspi_chip {
|
|
+ u8 mode;
|
|
+ u8 bits_per_word;
|
|
+ u16 void_write_data;
|
|
+ /* Only used in master mode */
|
|
+ u8 dbr; /* Double baud rate */
|
|
+ u8 pbr; /* Baud rate prescaler */
|
|
+ u8 br; /* Baud rate scaler */
|
|
+ u8 pcssck; /* PCS to SCK delay prescaler */
|
|
+ u8 pasc; /* After SCK delay prescaler */
|
|
+ u8 pdt; /* Delay after transfer prescaler */
|
|
+ u8 cssck; /* PCS to SCK delay scaler */
|
|
+ u8 asc; /* After SCK delay scaler */
|
|
+ u8 dt; /* Delay after transfer scaler */
|
|
+};
|
|
+#endif /*MCFDSPI_H_*/
|