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openwrt-xburst/target/linux/coldfire/patches/007-Add-eDMA-support-for-MCF5445x.patch
kaloz 7e7649baa9 [coldfire]: switch to 2.6.38 
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@31546 3c298f89-4303-0410-b956-a3cf2f4a3e73
2012-05-01 07:00:17 +00:00

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From cd07e01d0c6c207a6138e9d5229dfa8c88ab3879 Mon Sep 17 00:00:00 2001
From: Alison Wang <b18965@freescale.com>
Date: Thu, 4 Aug 2011 09:59:40 +0800
Subject: [PATCH 07/52] Add eDMA support for MCF5445x
Add MCF5445x on-chip eDMA controller driver.
Signed-off-by: Alison Wang <b18965@freescale.com>
---
arch/m68k/include/asm/mcf_edma.h | 246 +++++++++
drivers/Makefile | 2 +
drivers/dma/Kconfig | 15 +
drivers/dma/Makefile | 4 +
drivers/dma/mcf_edma.c | 1029 ++++++++++++++++++++++++++++++++++++++
drivers/dma/mcf_edma_test.c | 276 ++++++++++
6 files changed, 1572 insertions(+), 0 deletions(-)
create mode 100644 arch/m68k/include/asm/mcf_edma.h
create mode 100644 drivers/dma/mcf_edma.c
create mode 100644 drivers/dma/mcf_edma_test.c
--- /dev/null
+++ b/arch/m68k/include/asm/mcf_edma.h
@@ -0,0 +1,246 @@
+/*
+ * mcf_edma.h - Coldfire eDMA driver header file.
+ *
+ * Copyright (C) 2008-2011 Freescale Semiconductor, Inc. All Rights Reserved.
+ *
+ * Add support for m5441x platform (Lanttor.Guo@freescale.com)
+ *
+ * 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.
+ */
+
+#ifndef _MCF_EDMA_H
+#define _MCF_EDMA_H
+
+#include <asm/mcfsim.h>
+#include <linux/interrupt.h>
+#if defined(CONFIG_M5445X)
+#include <asm/mcf5445x_edma.h>
+#elif defined(CONFIG_M5441X)
+#include <asm/mcf5441x_edma.h>
+#endif
+#include <linux/scatterlist.h>
+
+#define MCF_EDMA_INT0_CHANNEL_BASE (8)
+#define MCF_EDMA_INT0_CONTROLLER_BASE (64)
+#define MCF_EDMA_INT0_BASE (MCF_EDMA_INT0_CHANNEL_BASE + \
+ MCF_EDMA_INT0_CONTROLLER_BASE)
+#define MCF_EDMA_INT0_NUM (16)
+#define MCF_EDMA_INT0_END (MCF_EDMA_INT0_NUM)
+
+#if defined(CONFIG_M5441X)
+#define MCF_EDMA_INT1_CHANNEL_BASE (8)
+#define MCF_EDMA_INT1_CONTROLLER_BASE (128)
+#define MCF_EDMA_INT1_BASE (MCF_EDMA_INT1_CHANNEL_BASE + \
+ MCF_EDMA_INT1_CONTROLLER_BASE)
+#define MCF_EDMA_INT1_NUM (40)
+#define MCF_EDMA_INT1_END (MCF_EDMA_INT0_END + MCF_EDMA_INT1_NUM)
+
+#define MCF_EDMA_INT2_CHANNEL_BASE (0)
+#define MCF_EDMA_INT2_CONTROLLER_BASE (192)
+#define MCF_EDMA_INT2_BASE (MCF_EDMA_INT2_CHANNEL_BASE + \
+ MCF_EDMA_INT2_CONTROLLER_BASE)
+#define MCF_EDMA_INT2_NUM (8)
+#define MCF_EDMA_INT2_END (MCF_EDMA_INT1_END + MCF_EDMA_INT2_NUM)
+
+#endif
+
+#if defined(CONFIG_M5445X)
+#define MCF_EDMA_CHANNELS (16) /* 0-15 */
+#elif defined(CONFIG_M5441X)
+#define MCF_EDMA_CHANNELS (64) /* 0-63 */
+#endif
+
+#define MCF_EDMA_CHANNEL_ANY (0xFF)
+#define MCF_EDMA_INT_ERR (16) /* edma error interrupt */
+
+#define MCF_EDMA_TCD_PER_CHAN 256
+
+#ifdef CONFIG_M54455
+/* eDMA engine TCD memory description */
+
+struct TCD {
+ u32 saddr;
+ u16 attr;
+ u16 soff;
+ u32 nbytes;
+ u32 slast;
+ u32 daddr;
+ u16 citer;
+ u16 doff;
+ u32 dlast_sga;
+ u16 biter;
+ u16 csr;
+} __packed;
+
+struct fsl_edma_requestbuf {
+ dma_addr_t saddr;
+ dma_addr_t daddr;
+ u32 soff;
+ u32 doff;
+ u32 attr;
+ u32 minor_loop;
+ u32 len;
+};
+
+/*
+ * config the eDMA to use the TCD sg feature
+ *
+ * @channel: which channel. in fact this function is designed to satisfy
+ * the ATA driver TCD SG need, i.e. by now it is a special
+ * func, because it need prev alloc channel TCD physical memory
+ * first, we add the ATA's in the eDMA init only
+ * @buf: buffer array to fill the TCDs
+ * @nents: the size of the buf
+ */
+void mcf_edma_sg_config(int channel, struct fsl_edma_requestbuf *buf,
+ int nents);
+
+/*
+ * The zero-copy version of mcf_edma_sg_config()
+ */
+void mcf_edma_sglist_config(int channel, struct scatterlist *sgl, int n_elem,
+ int dma_dir, u32 addr, u32 attr,
+ u32 soff, u32 doff, u32 nbytes);
+#endif
+
+/* Setup transfer control descriptor (TCD)
+ * channel - descriptor number
+ * source - source address
+ * dest - destination address
+ * attr - attributes
+ * soff - source offset
+ * nbytes - number of bytes to be transfered in minor loop
+ * slast - last source address adjustment
+ * citer - major loop count
+ * biter - begining minor loop count
+ * doff - destination offset
+ * dlast_sga - last destination address adjustment
+ * major_int - generate interrupt after each major loop
+ * disable_req - disable DMA request after major loop
+ */
+void mcf_edma_set_tcd_params(int channel, u32 source, u32 dest,
+ u32 attr, u32 soff, u32 nbytes, u32 slast,
+ u32 citer, u32 biter, u32 doff, u32 dlast_sga,
+ int major_int, int disable_req);
+
+/* Setup transfer control descriptor (TCD) and enable halfway irq
+ * channel - descriptor number
+ * source - source address
+ * dest - destination address
+ * attr - attributes
+ * soff - source offset
+ * nbytes - number of bytes to be transfered in minor loop
+ * slast - last source address adjustment
+ * biter - major loop count
+ * doff - destination offset
+ * dlast_sga - last destination address adjustment
+ * disable_req - disable DMA request after major loop
+ */
+void mcf_edma_set_tcd_params_halfirq(int channel, u32 source, u32 dest,
+ u32 attr, u32 soff, u32 nbytes, u32 slast,
+ u32 biter, u32 doff, u32 dlast_sga,
+ int disable_req);
+
+/* check if dma is done
+ * channel - descriptor number
+ * return 1 if done
+ */
+int mcf_edma_check_done(int channel);
+
+/* Starts eDMA transfer on specified channel
+ * channel - eDMA TCD number
+ */
+static inline void
+mcf_edma_start_transfer(int channel)
+{
+ MCF_EDMA_SERQ = channel;
+ MCF_EDMA_SSRT = channel;
+}
+
+/* Restart eDMA transfer from halfirq
+ * channel - eDMA TCD number
+ */
+static inline void
+mcf_edma_confirm_halfirq(int channel)
+{
+ /*MCF_EDMA_TCD_CSR(channel) = 7;*/
+ MCF_EDMA_SSRT = channel;
+}
+
+/* Starts eDMA transfer on specified channel based on peripheral request
+ * channel - eDMA TCD number
+ */
+static inline void mcf_edma_enable_transfer(int channel)
+{
+ MCF_EDMA_SERQ = channel;
+}
+
+
+/* Stops eDMA transfer
+ * channel - eDMA TCD number
+ */
+static inline void
+mcf_edma_stop_transfer(int channel)
+{
+ MCF_EDMA_CINT = channel;
+ MCF_EDMA_CERQ = channel;
+}
+
+/* Confirm that interrupt has been handled
+ * channel - eDMA TCD number
+ */
+static inline void
+mcf_edma_confirm_interrupt_handled(int channel)
+{
+ MCF_EDMA_CINT = channel;
+}
+
+/**
+ * mcf_edma_request_channel - Request an eDMA channel
+ * @channel: channel number. In case it is equal to EDMA_CHANNEL_ANY
+ * it will be allocated a first free eDMA channel.
+ * @handler: dma handler
+ * @error_handler: dma error handler
+ * @irq_level: irq level for the dma handler
+ * @arg: argument to pass back
+ * @lock: optional spinlock to hold over interrupt
+ * @device_id: device id
+ *
+ * Returns allocatedd channel number if success or
+ * a negative value if failure.
+ */
+int mcf_edma_request_channel(int channel,
+ irqreturn_t(*handler) (int, void *),
+ void (*error_handler) (int, void *),
+ u8 irq_level,
+ void *arg,
+ spinlock_t *lock, const char *device_id);
+
+/**
+ * Update the channel callback/arg
+ * @channel: channel number
+ * @handler: dma handler
+ * @error_handler: dma error handler
+ * @arg: argument to pass back
+ *
+ * Returns 0 if success or a negative value if failure
+ */
+int mcf_edma_set_callback(int channel,
+ irqreturn_t(*handler) (int, void *),
+ void (*error_handler) (int, void *), void *arg);
+
+/**
+ * Free the edma channel
+ * @channel: channel number
+ * @arg: argument created with
+ *
+ * Returns 0 if success or a negative value if failure
+ */
+int mcf_edma_free_channel(int channel, void *arg);
+
+void mcf_edma_dump_channel(int channel);
+
+#endif /* _MCF_EDMA_H */
--- a/drivers/Makefile
+++ b/drivers/Makefile
@@ -39,6 +39,7 @@ obj-$(CONFIG_FB_I810) += video
obj-$(CONFIG_FB_INTEL) += video/intelfb/
obj-$(CONFIG_PARPORT) += parport/
+obj-$(CONFIG_COLDFIRE_EDMA) += dma/
obj-y += base/ block/ misc/ mfd/ nfc/
obj-$(CONFIG_NUBUS) += nubus/
obj-y += macintosh/
@@ -114,6 +115,7 @@ obj-$(CONFIG_BCMA) += bcma/
obj-$(CONFIG_VHOST_NET) += vhost/
obj-$(CONFIG_VLYNQ) += vlynq/
obj-$(CONFIG_STAGING) += staging/
+obj-$(CONFIG_MCD_DMA) += dma/
obj-y += platform/
obj-y += ieee802154/
#common clk code
--- a/drivers/dma/Kconfig
+++ b/drivers/dma/Kconfig
@@ -114,6 +114,21 @@ config MPC512X_DMA
---help---
Enable support for the Freescale MPC512x built-in DMA engine.
+config COLDFIRE_EDMA
+ tristate "Coldfire eDMA support"
+ default y
+ depends on COLDFIRE && (M5445X || M5441X)
+ help
+ Enable support for Coldfire eDMA controller. For example
+ used by Coldfire SSI Audio device driver.
+
+config COLDFIRE_EDMA_TEST
+ tristate "Coldfire eDMA simple test module"
+ default m
+ depends on COLDFIRE_EDMA
+ help
+ This is simple eDMA test module.
+
config MV_XOR
bool "Marvell XOR engine support"
depends on PLAT_ORION
--- a/drivers/dma/Makefile
+++ b/drivers/dma/Makefile
@@ -13,10 +13,14 @@ obj-$(CONFIG_INTEL_IOATDMA) += ioat/
obj-$(CONFIG_INTEL_IOP_ADMA) += iop-adma.o
obj-$(CONFIG_FSL_DMA) += fsldma.o
obj-$(CONFIG_MPC512X_DMA) += mpc512x_dma.o
+obj-$(CONFIG_COLDFIRE_EDMA) += mcf_edma.o
+obj-$(CONFIG_COLDFIRE_EDMA_TEST) += mcf_edma_test.o
obj-$(CONFIG_MV_XOR) += mv_xor.o
obj-$(CONFIG_DW_DMAC) += dw_dmac.o
obj-$(CONFIG_AT_HDMAC) += at_hdmac.o
obj-$(CONFIG_MX3_IPU) += ipu/
+obj-$(CONFIG_MCD_DMA) += mcddma.o
+mcddma-objs := MCD_dmaApi.o MCD_tasks.o MCD_tasksInit.o
obj-$(CONFIG_TXX9_DMAC) += txx9dmac.o
obj-$(CONFIG_SH_DMAE) += shdma.o
obj-$(CONFIG_COH901318) += coh901318.o coh901318_lli.o
--- /dev/null
+++ b/drivers/dma/mcf_edma.c
@@ -0,0 +1,1029 @@
+/*
+ * mcf_edma.c - eDMA driver for Coldfire.
+ *
+ * Copyright (C) 2008-2011 Freescale Semiconductor, Inc. All Rights Reserved.
+ * Author: Andrey Butok
+ * Yaroslav Vinogradov
+ * Lanttor.Guo@freescale.com add m5441x platform support.
+ *
+ * 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:
+ * v0.002 29 February 2008 Andrey Butok, Freescale Semiconductor
+ * Added support of atomatic channel allocation from the
+ * channel pool.
+ * v0.001 12 February 2008 Andrey Butok
+ * Initial Release - developed on uClinux with 2.6.23 kernel.
+ * Based on coldfire_edma.c code
+ * of Yaroslav Vinogradov (Freescale Semiconductor, Inc.)
+ *
+ * NOTE: This driver was tested on MCF52277 platform.
+ * It should also work on other Coldfire platdorms with eDMA module.
+ *
+ * TBD: Try to make it more general.
+ * Try to integrate with current <asm/dma.h> <kernel/dma.c> API
+ * or use Intel DMA API
+ */
+
+#include <linux/dma-mapping.h>
+#include <asm/mcf_edma.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <asm/coldfire.h>
+#include <linux/fs.h>
+#include <linux/cdev.h>
+#include <linux/seq_file.h>
+#include <linux/proc_fs.h>
+
+/* Please add here processors that were tested with this driver */
+#if !defined(CONFIG_M5227x) && !defined(CONFIG_M5445X) && \
+ !defined(CONFIG_M5441X)
+#error "The driver is not tested/designed for your processor!"
+#endif
+
+#define MCF_EDMA_DRIVER_VERSION "Revision: 0.003"
+#define MCF_EDMA_DRIVER_AUTHOR "Freescale Semiconductor Inc, Andrey Butok"
+#define MCF_EDMA_DRIVER_DESC "Coldfire EDMA driver."
+#define MCF_EDMA_DRIVER_INFO DRIVER_VERSION " " DRIVER_DESC
+#define MCF_EDMA_DRIVER_LICENSE "GPL"
+#define MCF_EDMA_DRIVER_NAME "mcf_edma"
+
+#define MCF_EDMA_DEV_MINOR (1)
+
+#undef MCF_EDMA_DEBUG
+
+#ifdef MCF_EDMA_DEBUG
+#define DBG(fmt, args...) printk(KERN_INFO "[%s] " fmt, \
+ __func__, ## args)
+#else
+#define DBG(fmt, args...) do {} while (0)
+#endif
+
+#define ERR(format, arg...) printk(KERN_ERR "%s:%s: " format "\n", \
+ __FILE__, __func__ , ## arg)
+#define INFO(stuff...) printk(KERN_INFO MCF_EDMA_DRIVER_NAME \
+ ": " stuff)
+
+/* DMA channel pool used for atomtic channel allocation.
+ * You can edit this list. First candidates are "Not used/Reserved" channels */
+u8 mcf_edma_channel_pool[] = { 1, /* Not used */
+ 0, /* External DMA request */
+ 5, /* UART1 Receive */
+ 6, /* UART1 Transmit */
+ 7, /* UART2 Receive */
+ 8, /* UART2 Transmit */
+#if defined(CONFIG_M5441X)
+ 16,
+ 55,
+ 56,
+ 63,
+#endif
+};
+
+/*
+ * Callback handler data for each TCD
+ */
+struct mcf_edma_isr_record {
+ irqreturn_t(*irq_handler) (int, void *); /* interrupt handler */
+ void (*error_handler) (int, void *); /* error interrupt handler */
+ void *arg; /* argument to pass back */
+ int allocated; /* busy flag */
+ spinlock_t *lock; /* spin lock (optional) */
+ const char *device_id; /* dev id string, used in procfs */
+};
+
+/*
+ * Device structure
+ */
+struct mcf_edma_dev {
+ struct cdev cdev; /* character device */
+ struct mcf_edma_isr_record dma_interrupt_handlers[MCF_EDMA_CHANNELS];
+};
+
+/* allocated major device number */
+static int mcf_edma_major;
+
+/* device driver structure */
+static struct mcf_edma_dev *mcf_edma_devp;
+
+#ifdef CONFIG_M54455
+/* PATA controller structure */
+static struct {
+ struct TCD *pata_tcd_va;
+ dma_addr_t pata_tcd_pa;
+} fsl_pata_dma_tcd;
+#endif
+
+/* device driver file operations */
+const struct file_operations mcf_edma_fops = {
+ .owner = THIS_MODULE,
+};
+
+/**
+ * mcf_edma_isr - eDMA channel interrupt handler
+ * @irq: interrupt number
+ * @dev_id: argument
+ */
+static irqreturn_t
+mcf_edma_isr(int irq, void *dev_id)
+{
+ int channel = -1;
+ int result = IRQ_HANDLED;
+
+#if defined(CONFIG_M5445X)
+ channel = irq - MCF_EDMA_INT0_BASE;
+#elif defined(CONFIG_M5441X)
+ if (irq >= MCF_EDMA_INT0_BASE &&
+ irq < MCF_EDMA_INT0_BASE + MCF_EDMA_INT0_NUM)
+ channel = irq - MCF_EDMA_INT0_BASE;
+ else if (irq >= MCF_EDMA_INT1_BASE &&
+ irq < MCF_EDMA_INT1_BASE + MCF_EDMA_INT1_NUM)
+ channel = irq - MCF_EDMA_INT1_BASE + MCF_EDMA_INT0_END;
+ else if (irq == MCF_EDMA_INT2_BASE &&
+ irq < MCF_EDMA_INT2_BASE + MCF_EDMA_INT2_NUM) {
+ int i;
+ for (i = 0; i < MCF_EDMA_INT2_NUM; i++) {
+ if ((MCF_EDMA_INTH >> 24) & (0x1 << i)) {
+ channel = irq - MCF_EDMA_INT2_BASE +
+ MCF_EDMA_INT1_END + i;
+ break;
+ }
+ }
+ } else {
+ ERR("Bad irq number at isr!\n");
+ return result;
+ }
+#endif
+
+ DBG("\n");
+
+ if ((mcf_edma_devp != NULL) &&
+ (mcf_edma_devp->dma_interrupt_handlers[channel].irq_handler)) {
+ /* call user irq handler */
+ if (mcf_edma_devp->dma_interrupt_handlers[channel].lock)
+ spin_lock(mcf_edma_devp->
+ dma_interrupt_handlers[channel].lock);
+
+ result =
+ mcf_edma_devp->dma_interrupt_handlers[channel].
+ irq_handler(channel,
+ mcf_edma_devp->dma_interrupt_handlers[channel].
+ arg);
+
+ if (mcf_edma_devp->dma_interrupt_handlers[channel].lock)
+ spin_unlock(mcf_edma_devp->
+ dma_interrupt_handlers[channel].lock);
+ } else {
+ /* no irq handler so just ack it */
+ mcf_edma_confirm_interrupt_handled(channel);
+ ERR(" No handler for DMA channel (%d)\n", channel);
+ }
+
+ return result;
+}
+
+/**
+ * mcf_edma_error_isr - eDMA error interrupt handler
+ * @irq: interrupt number
+ * @dev_id: argument
+ */
+static irqreturn_t
+mcf_edma_error_isr(int irq, void *dev_id)
+{
+ int i;
+
+#if defined(CONFIG_M5445X)
+ u16 err;
+
+ err = MCF_EDMA_ERR;
+ for (i = 0; i < MCF_EDMA_CHANNELS; i++) {
+ if (err & (1 << i)) {
+ if (mcf_edma_devp != NULL &&
+ mcf_edma_devp->dma_interrupt_handlers[i].
+ error_handler)
+ mcf_edma_devp->dma_interrupt_handlers[i].
+ error_handler(i,
+ mcf_edma_devp->
+ dma_interrupt_handlers[i].
+ arg);
+ else
+ ERR(" DMA error on channel (%d)\n", i);
+ }
+ }
+#elif defined(CONFIG_M5441X)
+ u32 errl, errh;
+
+ errl = MCF_EDMA_ERRL;
+ errh = MCF_EDMA_ERRH;
+
+ for (i = 0; i < MCF_EDMA_CHANNELS; i++) {
+ if ((errl & (1 << i)) || (errh & (1 << (i - 32)))) {
+ if (mcf_edma_devp != NULL &&
+ mcf_edma_devp->dma_interrupt_handlers[i].
+ error_handler)
+ mcf_edma_devp->dma_interrupt_handlers[i].
+ error_handler(i, mcf_edma_devp->
+ dma_interrupt_handlers[i].arg);
+ else
+ ERR(" DMA error on channel (%d)\n", i);
+ }
+ }
+#endif
+ MCF_EDMA_CERR = MCF_EDMA_CERR_CAER;
+ return IRQ_HANDLED;
+}
+
+/**
+ * mcf_edma_check_done - Check if channel is finished or not
+ * @channel: channel number
+ * return: 0 if not done yet
+ */
+int
+mcf_edma_check_done(int channel)
+{
+ if (channel < 0 || channel > MCF_EDMA_CHANNELS)
+ return 1;
+
+ return MCF_EDMA_TCD_CSR(channel) & MCF_EDMA_TCD_CSR_DONE;
+}
+EXPORT_SYMBOL(mcf_edma_check_done);
+
+/**
+ * mcf_edma_set_tcd_params - Set transfer control descriptor (TCD)
+ * @channel: channel number
+ * @source: source address
+ * @dest: destination address
+ * @attr: attributes
+ * @soff: source offset
+ * @nbytes: number of bytes to be transfered in minor loop
+ * @slast: last source address adjustment
+ * @citer: major loop count
+ * @biter: beginning major loop count
+ * @doff: destination offset
+ * @dlast_sga: last destination address adjustment
+ * @major_int: generate interrupt after each major loop
+ * @disable_req: disable DMA request after major loop
+ */
+void
+mcf_edma_set_tcd_params(int channel, u32 source, u32 dest,
+ u32 attr, u32 soff, u32 nbytes, u32 slast,
+ u32 citer, u32 biter, u32 doff, u32 dlast_sga,
+ int major_int, int disable_req)
+{
+ DBG("(%d)\n", channel);
+
+ if (channel < 0 || channel > MCF_EDMA_CHANNELS)
+ return;
+
+ MCF_EDMA_TCD_SADDR(channel) = source;
+ MCF_EDMA_TCD_DADDR(channel) = dest;
+ MCF_EDMA_TCD_ATTR(channel) = attr;
+ MCF_EDMA_TCD_SOFF(channel) = MCF_EDMA_TCD_SOFF_SOFF(soff);
+ MCF_EDMA_TCD_NBYTES(channel) = MCF_EDMA_TCD_NBYTES_NBYTES(nbytes);
+ MCF_EDMA_TCD_SLAST(channel) = MCF_EDMA_TCD_SLAST_SLAST(slast);
+ MCF_EDMA_TCD_CITER(channel) = MCF_EDMA_TCD_CITER_CITER(citer);
+ MCF_EDMA_TCD_BITER(channel) = MCF_EDMA_TCD_BITER_BITER(biter);
+ MCF_EDMA_TCD_DOFF(channel) = MCF_EDMA_TCD_DOFF_DOFF(doff);
+ MCF_EDMA_TCD_DLAST_SGA(channel) =
+ MCF_EDMA_TCD_DLAST_SGA_DLAST_SGA(dlast_sga);
+ MCF_EDMA_TCD_CSR(channel) = 0x0000;
+
+ /* interrupt at the end of major loop */
+ if (major_int)
+ MCF_EDMA_TCD_CSR(channel) |= MCF_EDMA_TCD_CSR_INT_MAJOR;
+ else
+ MCF_EDMA_TCD_CSR(channel) &= ~MCF_EDMA_TCD_CSR_INT_MAJOR;
+
+ /* disable request at the end of major loop of transfer or not */
+ if (disable_req)
+ MCF_EDMA_TCD_CSR(channel) |= MCF_EDMA_TCD_CSR_D_REQ;
+ else
+ MCF_EDMA_TCD_CSR(channel) &= ~MCF_EDMA_TCD_CSR_D_REQ;
+
+ /* enable error interrupt */
+ MCF_EDMA_SEEI = MCF_EDMA_SEEI_SEEI(channel);
+}
+EXPORT_SYMBOL(mcf_edma_set_tcd_params);
+#ifdef CONFIG_M54455
+/**
+ * mcf_edma_sg_config - config an eDMA channel to use the S/G tcd feature
+ * @channel: channel number
+ * @buf: the array of tcd sg
+ * @nents: number of tcd sg array, the max is 256 set but can modify
+ *
+ * limitation:
+ * currently this function is only for PATA RX/TX on MCF54455,
+ * so eDMA init does not allocate TCD memory for other memory
+ *
+ * TODO:
+ * any one who need this feature shoule add his own TCD memory init
+ */
+void mcf_edma_sg_config(int channel, struct fsl_edma_requestbuf *buf,
+ int nents)
+{
+ struct TCD *vtcd = (struct TCD *)fsl_pata_dma_tcd.pata_tcd_va;
+ u32 ptcd = fsl_pata_dma_tcd.pata_tcd_pa;
+ struct fsl_edma_requestbuf *pb = buf;
+ int i;
+
+ if (channel < MCF_EDMA_CHAN_ATA_RX || channel > MCF_EDMA_CHAN_ATA_TX) {
+ printk(KERN_ERR "mcf edma sg config err, not support\n");
+ return;
+ }
+ if (nents > MCF_EDMA_TCD_PER_CHAN) {
+ printk(KERN_ERR "Too many SGs, please confirm.%d > %d\n",
+ nents, MCF_EDMA_TCD_PER_CHAN);
+ return;
+ }
+
+ /* build our tcd sg array */
+ for (i = 0; i < nents; i++) {
+ memset(vtcd, 0 , sizeof(struct TCD));
+ vtcd->saddr = pb->saddr;
+ vtcd->daddr = pb->daddr;
+ vtcd->attr = pb->attr;
+ vtcd->soff = pb->soff;
+ vtcd->doff = pb->doff;
+ vtcd->nbytes = pb->minor_loop;
+ vtcd->citer = vtcd->biter = pb->len/pb->minor_loop;
+
+ if (i != nents - 1) {
+ vtcd->csr |= MCF_EDMA_TCD_CSR_E_SG;/* we are tcd sg */
+ vtcd->dlast_sga =
+ (u32)(ptcd + (i + 1)*sizeof(struct TCD));
+ } else {
+ /*this is the last sg, so enable the major int*/
+ vtcd->csr |= MCF_EDMA_TCD_CSR_INT_MAJOR
+ |MCF_EDMA_TCD_CSR_D_REQ;
+ }
+ pb++;
+ vtcd++;
+ }
+
+ /* Now setup the firset TCD for this sg to the edma enginee */
+ vtcd = fsl_pata_dma_tcd.pata_tcd_va;
+
+ MCF_EDMA_TCD_CSR(channel) = 0x0000;
+ MCF_EDMA_TCD_SADDR(channel) = vtcd->saddr;
+ MCF_EDMA_TCD_DADDR(channel) = vtcd->daddr;
+ MCF_EDMA_TCD_ATTR(channel) = vtcd->attr;
+ MCF_EDMA_TCD_SOFF(channel) = MCF_EDMA_TCD_SOFF_SOFF(vtcd->soff);
+ MCF_EDMA_TCD_NBYTES(channel) = MCF_EDMA_TCD_NBYTES_NBYTES(vtcd->nbytes);
+ MCF_EDMA_TCD_SLAST(channel) = MCF_EDMA_TCD_SLAST_SLAST(vtcd->slast);
+ MCF_EDMA_TCD_CITER(channel) = MCF_EDMA_TCD_CITER_CITER(vtcd->citer);
+ MCF_EDMA_TCD_BITER(channel) = MCF_EDMA_TCD_BITER_BITER(vtcd->biter);
+ MCF_EDMA_TCD_DOFF(channel) = MCF_EDMA_TCD_DOFF_DOFF(vtcd->doff);
+ MCF_EDMA_TCD_DLAST_SGA(channel) =
+ MCF_EDMA_TCD_DLAST_SGA_DLAST_SGA(vtcd->dlast_sga);
+ MCF_EDMA_TCD_CSR(channel) |= vtcd->csr;
+}
+EXPORT_SYMBOL(mcf_edma_sg_config);
+
+/**
+ * The zero-copy version of mcf_edma_sg_config
+ * dma_dir : indicate teh addr direction
+ */
+void mcf_edma_sglist_config(int channel, struct scatterlist *sgl, int n_elem,
+ int dma_dir, u32 addr, u32 attr,
+ u32 soff, u32 doff, u32 nbytes)
+{
+ struct TCD *vtcd = (struct TCD *)fsl_pata_dma_tcd.pata_tcd_va;
+ u32 ptcd = fsl_pata_dma_tcd.pata_tcd_pa;
+ struct scatterlist *sg;
+ u32 si;
+
+ if (channel < MCF_EDMA_CHAN_ATA_RX || channel > MCF_EDMA_CHAN_ATA_TX) {
+ printk(KERN_ERR "mcf edma sg config err, not support\n");
+ return;
+ }
+ if (n_elem > MCF_EDMA_TCD_PER_CHAN) {
+ printk(KERN_ERR "Too many SGs, please confirm.%d > %d\n",
+ n_elem, MCF_EDMA_TCD_PER_CHAN);
+ return;
+ }
+
+ /* build our tcd sg array */
+ if (dma_dir == DMA_TO_DEVICE) { /* write */
+ for_each_sg(sgl, sg, n_elem, si) {
+ memset(vtcd, 0 , sizeof(struct TCD));
+ vtcd->saddr = sg_dma_address(sg);
+ vtcd->daddr = addr;
+ vtcd->attr = attr;
+ vtcd->soff = soff;
+ vtcd->doff = doff;
+ vtcd->nbytes = nbytes;
+ vtcd->citer = vtcd->biter = sg_dma_len(sg)/nbytes;
+
+ if (si != n_elem - 1) {
+ /* we are tcd sg */
+ vtcd->csr |= MCF_EDMA_TCD_CSR_E_SG;
+ vtcd->dlast_sga = (u32)(ptcd + (si + 1) * \
+ sizeof(struct TCD));
+ } else {
+ /*this is the last sg, so enable the major int*/
+ vtcd->csr |= MCF_EDMA_TCD_CSR_INT_MAJOR
+ |MCF_EDMA_TCD_CSR_D_REQ;
+ }
+ vtcd++;
+ }
+ } else {
+ for_each_sg(sgl, sg, n_elem, si) {
+ memset(vtcd, 0 , sizeof(struct TCD));
+ vtcd->daddr = sg_dma_address(sg);
+ vtcd->saddr = addr;
+ vtcd->attr = attr;
+ vtcd->soff = soff;
+ vtcd->doff = doff;
+ vtcd->nbytes = nbytes;
+ vtcd->citer = vtcd->biter = sg_dma_len(sg)/nbytes;
+
+ if (si != n_elem - 1) {
+ /* we are tcd sg */
+ vtcd->csr |= MCF_EDMA_TCD_CSR_E_SG;
+ vtcd->dlast_sga = (u32)(ptcd + (si + 1) * \
+ sizeof(struct TCD));
+ } else {
+ /*this is the last sg, so enable the major int*/
+ vtcd->csr |= MCF_EDMA_TCD_CSR_INT_MAJOR
+ |MCF_EDMA_TCD_CSR_D_REQ;
+ }
+ vtcd++;
+ }
+ }
+
+ /* Now setup the firset TCD for this sg to the edma enginee */
+ vtcd = fsl_pata_dma_tcd.pata_tcd_va;
+
+ MCF_EDMA_TCD_CSR(channel) = 0x0000;
+ MCF_EDMA_TCD_SADDR(channel) = vtcd->saddr;
+ MCF_EDMA_TCD_DADDR(channel) = vtcd->daddr;
+ MCF_EDMA_TCD_ATTR(channel) = vtcd->attr;
+ MCF_EDMA_TCD_SOFF(channel) = MCF_EDMA_TCD_SOFF_SOFF(vtcd->soff);
+ MCF_EDMA_TCD_NBYTES(channel) = MCF_EDMA_TCD_NBYTES_NBYTES(vtcd->nbytes);
+ MCF_EDMA_TCD_SLAST(channel) = MCF_EDMA_TCD_SLAST_SLAST(vtcd->slast);
+ MCF_EDMA_TCD_CITER(channel) = MCF_EDMA_TCD_CITER_CITER(vtcd->citer);
+ MCF_EDMA_TCD_BITER(channel) = MCF_EDMA_TCD_BITER_BITER(vtcd->biter);
+ MCF_EDMA_TCD_DOFF(channel) = MCF_EDMA_TCD_DOFF_DOFF(vtcd->doff);
+ MCF_EDMA_TCD_DLAST_SGA(channel) =
+ MCF_EDMA_TCD_DLAST_SGA_DLAST_SGA(vtcd->dlast_sga);
+
+ MCF_EDMA_TCD_CSR(channel) |= vtcd->csr;
+}
+EXPORT_SYMBOL(mcf_edma_sglist_config);
+#endif
+/**
+ * mcf_edma_set_tcd_params_halfirq - Set TCD AND enable half irq
+ * @channel: channel number
+ * @source: source address
+ * @dest: destination address
+ * @attr: attributes
+ * @soff: source offset
+ * @nbytes: number of bytes to be transfered in minor loop
+ * @slast: last source address adjustment
+ * @biter: beginning major loop count
+ * @doff: destination offset
+ * @dlast_sga: last destination address adjustment
+ * @disable_req: disable DMA request after major loop
+ */
+void
+mcf_edma_set_tcd_params_halfirq(int channel, u32 source, u32 dest,
+ u32 attr, u32 soff, u32 nbytes, u32 slast,
+ u32 biter, u32 doff, u32 dlast_sga,
+ int disable_req)
+{
+ DBG("(%d)\n", channel);
+
+ if (channel < 0 || channel > MCF_EDMA_CHANNELS)
+ return;
+
+ mcf_edma_set_tcd_params(channel, source, dest,
+ attr, soff, nbytes, slast,
+ biter, biter, doff, dlast_sga,
+ 1/*0*/, disable_req);
+
+ if (biter < 2)
+ printk(KERN_ERR "MCF_EDMA: Request for halfway irq denied\n");
+
+ /* interrupt midway through major loop */
+ MCF_EDMA_TCD_CSR(channel) |= MCF_EDMA_TCD_CSR_INT_HALF;
+}
+EXPORT_SYMBOL(mcf_edma_set_tcd_params_halfirq);
+
+/**
+ * mcf_edma_request_channel - Request an eDMA channel
+ * @channel: channel number. In case it is equal to EDMA_CHANNEL_ANY
+ * it will be allocated a first free eDMA channel.
+ * @handler: dma handler
+ * @error_handler: dma error handler
+ * @irq_level: irq level for the dma handler
+ * @arg: argument to pass back
+ * @lock: optional spinlock to hold over interrupt
+ * @device_id: device id
+ *
+ * Returns allocatedd channel number if success or
+ * a negative value if failure.
+ */
+int
+mcf_edma_request_channel(int channel,
+ irqreturn_t(*handler) (int, void *),
+ void (*error_handler) (int, void *),
+ u8 irq_level,
+ void *arg, spinlock_t *lock, const char *device_id)
+{
+ DBG("\n channel=%d\n", channel);
+
+ if (mcf_edma_devp != NULL
+ && ((channel >= 0 && channel <= MCF_EDMA_CHANNELS)
+ || (channel == MCF_EDMA_CHANNEL_ANY))) {
+ if (channel == MCF_EDMA_CHANNEL_ANY) {
+ int i;
+ for (i = 0; i < sizeof(mcf_edma_channel_pool); i++) {
+ if (mcf_edma_devp->dma_interrupt_handlers
+ [mcf_edma_channel_pool[i]].allocated ==
+ 0) {
+ channel = mcf_edma_channel_pool[i];
+ break;
+ }
+ };
+ if (channel == MCF_EDMA_CHANNEL_ANY)
+ return -EBUSY;
+ } else {
+ if (mcf_edma_devp->dma_interrupt_handlers[channel].
+ allocated)
+ return -EBUSY;
+ }
+
+ mcf_edma_devp->dma_interrupt_handlers[channel].allocated = 1;
+ mcf_edma_devp->dma_interrupt_handlers[channel].irq_handler =
+ handler;
+ mcf_edma_devp->dma_interrupt_handlers[channel].error_handler =
+ error_handler;
+ mcf_edma_devp->dma_interrupt_handlers[channel].arg = arg;
+ mcf_edma_devp->dma_interrupt_handlers[channel].lock = lock;
+ mcf_edma_devp->dma_interrupt_handlers[channel].device_id =
+ device_id;
+
+ /* Initalize interrupt controller to allow eDMA interrupts */
+#if defined(CONFIG_M5445X)
+ MCF_INTC0_ICR(MCF_EDMA_INT0_CHANNEL_BASE + channel) = irq_level;
+ MCF_INTC0_CIMR = MCF_EDMA_INT0_CHANNEL_BASE + channel;
+#elif defined(CONFIG_M5441X)
+ if (channel >= 0 && channel < MCF_EDMA_INT0_END) {
+ MCF_INTC0_ICR(MCF_EDMA_INT0_CHANNEL_BASE + channel) =
+ irq_level;
+ MCF_INTC0_CIMR = MCF_EDMA_INT0_CHANNEL_BASE + channel;
+ } else if (channel >= MCF_EDMA_INT0_END &&
+ channel < MCF_EDMA_INT1_END) {
+ MCF_INTC1_ICR(MCF_EDMA_INT1_CHANNEL_BASE +
+ (channel - MCF_EDMA_INT0_END)) = irq_level;
+ MCF_INTC1_CIMR = MCF_EDMA_INT1_CHANNEL_BASE +
+ (channel - MCF_EDMA_INT0_END);
+ } else if (channel >= MCF_EDMA_INT1_END &&
+ channel < MCF_EDMA_INT2_END) {
+ MCF_INTC2_ICR(MCF_EDMA_INT2_CHANNEL_BASE) = irq_level;
+ MCF_INTC2_CIMR = MCF_EDMA_INT2_CHANNEL_BASE;
+ } else
+ ERR("Bad channel number!\n");
+#endif
+ return channel;
+ }
+ return -EINVAL;
+}
+EXPORT_SYMBOL(mcf_edma_request_channel);
+
+/**
+ * mcf_edma_set_callback - Update the channel callback/arg
+ * @channel: channel number
+ * @handler: dma handler
+ * @error_handler: dma error handler
+ * @arg: argument to pass back
+ *
+ * Returns 0 if success or a negative value if failure
+ */
+int
+mcf_edma_set_callback(int channel,
+ irqreturn_t(*handler) (int, void *),
+ void (*error_handler) (int, void *), void *arg)
+{
+ DBG("\n");
+
+ if (mcf_edma_devp != NULL && channel >= 0
+ && channel <= MCF_EDMA_CHANNELS
+ && mcf_edma_devp->dma_interrupt_handlers[channel].allocated) {
+ mcf_edma_devp->dma_interrupt_handlers[channel].irq_handler =
+ handler;
+ mcf_edma_devp->dma_interrupt_handlers[channel].error_handler =
+ error_handler;
+ mcf_edma_devp->dma_interrupt_handlers[channel].arg = arg;
+ return 0;
+ }
+ return -EINVAL;
+}
+EXPORT_SYMBOL(mcf_edma_set_callback);
+
+/**
+ * mcf_edma_free_channel - Free the edma channel
+ * @channel: channel number
+ * @arg: argument created with
+ *
+ * Returns 0 if success or a negative value if failure
+ */
+int
+mcf_edma_free_channel(int channel, void *arg)
+{
+ DBG("\n");
+
+ if (mcf_edma_devp != NULL && channel >= 0
+ && channel <= MCF_EDMA_CHANNELS) {
+ if (mcf_edma_devp->dma_interrupt_handlers[channel].allocated) {
+#if 1
+ if (mcf_edma_devp->dma_interrupt_handlers[channel].
+ arg != arg)
+ return -EBUSY;
+#endif
+
+ mcf_edma_devp->dma_interrupt_handlers[channel].
+ allocated = 0;
+ mcf_edma_devp->dma_interrupt_handlers[channel].arg =
+ NULL;
+ mcf_edma_devp->dma_interrupt_handlers[channel].
+ irq_handler = NULL;
+ mcf_edma_devp->dma_interrupt_handlers[channel].
+ error_handler = NULL;
+ mcf_edma_devp->dma_interrupt_handlers[channel].lock =
+ NULL;
+ }
+
+ /* make sure error interrupt is disabled */
+ MCF_EDMA_CEEI = MCF_EDMA_CEEI_CEEI(channel);
+
+ return 0;
+ }
+ return -EINVAL;
+}
+EXPORT_SYMBOL(mcf_edma_free_channel);
+
+/**
+ * mcf_edma_cleanup - cleanup driver allocated resources
+ */
+static void
+mcf_edma_cleanup(void)
+{
+ dev_t devno;
+ int i;
+
+ DBG("\n");
+
+ /* disable all error ints */
+ MCF_EDMA_CEEI = MCF_EDMA_CEEI_CAEE;
+
+ /* free interrupts/memory */
+ if (mcf_edma_devp) {
+ for (i = 0; i < MCF_EDMA_CHANNELS; i++) {
+ #if defined(CONFIG_M5445X)
+ free_irq(MCF_EDMA_INT0_BASE + i, mcf_edma_devp);
+ #elif defined(CONFIG_M5441X)
+ if (i >= 0 && i < MCF_EDMA_INT0_END)
+ free_irq(MCF_EDMA_INT0_BASE + i, mcf_edma_devp);
+ else if (i >= MCF_EDMA_INT0_END &&
+ i <= MCF_EDMA_INT1_END)
+ free_irq(MCF_EDMA_INT1_BASE +
+ (i - MCF_EDMA_INT0_END), mcf_edma_devp);
+ else if (i >= MCF_EDMA_INT1_END &&
+ i < MCF_EDMA_INT2_END) {
+ free_irq(MCF_EDMA_INT2_BASE, mcf_edma_devp);
+ break;
+ } else {
+ ERR("Bad irq number!\n");
+ return;
+ }
+ #endif
+ }
+
+ free_irq(MCF_EDMA_INT0_BASE + MCF_EDMA_INT_ERR, mcf_edma_devp);
+ cdev_del(&mcf_edma_devp->cdev);
+ kfree(mcf_edma_devp);
+ }
+
+ /* unregister character device */
+ devno = MKDEV(mcf_edma_major, 0);
+ unregister_chrdev_region(devno, 1);
+}
+
+/**
+ * mcf_edma_dump_channel - dump a channel information
+ */
+void
+mcf_edma_dump_channel(int channel)
+{
+ printk(KERN_DEBUG "EDMA Channel %d\n", channel);
+ printk(KERN_DEBUG " TCD Base = 0x%x\n",
+ (int)&MCF_EDMA_TCD_SADDR(channel));
+ printk(KERN_DEBUG " SRCADDR = 0x%lx\n",
+ MCF_EDMA_TCD_SADDR(channel));
+ printk(KERN_DEBUG " SRCOFF = 0x%x\n",
+ MCF_EDMA_TCD_SOFF(channel));
+ printk(KERN_DEBUG " XFR ATTRIB = 0x%x\n",
+ MCF_EDMA_TCD_ATTR(channel));
+ printk(KERN_DEBUG " SRCLAST = 0x%lx\n",
+ MCF_EDMA_TCD_SLAST(channel));
+ printk(KERN_DEBUG " DSTADDR = 0x%lx\n",
+ MCF_EDMA_TCD_DADDR(channel));
+ printk(KERN_DEBUG " MINOR BCNT = 0x%lx\n",
+ MCF_EDMA_TCD_NBYTES(channel));
+ printk(KERN_DEBUG " CUR_LOOP_CNT = 0x%x\n",
+ MCF_EDMA_TCD_CITER(channel)&0x1ff);
+ printk(KERN_DEBUG " BEG_LOOP_CNT = 0x%x\n",
+ MCF_EDMA_TCD_BITER(channel)&0x1ff);
+ printk(KERN_DEBUG " STATUS = 0x%x\n",
+ MCF_EDMA_TCD_CSR(channel));
+
+}
+EXPORT_SYMBOL(mcf_edma_dump_channel);
+
+#ifdef CONFIG_PROC_FS
+/*
+ * proc file system support
+ */
+
+#define FREE_CHANNEL "free"
+#define DEVICE_UNKNOWN "device unknown"
+
+/**
+ * mcf_edma_proc_show - print out proc info
+ * @m: seq_file
+ * @v:
+ */
+static int
+mcf_edma_proc_show(struct seq_file *m, void *v)
+{
+ int i;
+
+ if (mcf_edma_devp == NULL)
+ return 0;
+
+ for (i = 0; i < MCF_EDMA_CHANNELS; i++) {
+ if (mcf_edma_devp->dma_interrupt_handlers[i].allocated) {
+ if (mcf_edma_devp->dma_interrupt_handlers[i].device_id)
+ seq_printf(m, "%2d: %s\n", i,
+ mcf_edma_devp->
+ dma_interrupt_handlers[i].
+ device_id);
+ else
+ seq_printf(m, "%2d: %s\n", i, DEVICE_UNKNOWN);
+ } else
+ seq_printf(m, "%2d: %s\n", i, FREE_CHANNEL);
+ }
+ return 0;
+}
+
+/**
+ * mcf_edma_proc_open - open the proc file
+ * @inode: inode ptr
+ * @file: file ptr
+ */
+static int
+mcf_edma_proc_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, mcf_edma_proc_show, NULL);
+}
+
+static const struct file_operations mcf_edma_proc_operations = {
+ .open = mcf_edma_proc_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+
+/**
+ * mcf_edma_proc_init - initialize proc filesystem
+ */
+static int __init
+mcf_edma_proc_init(void)
+{
+ struct proc_dir_entry *e;
+
+ e = create_proc_entry("edma", 0, NULL);
+ if (e)
+ e->proc_fops = &mcf_edma_proc_operations;
+
+ return 0;
+}
+
+#endif
+
+/**
+ * mcf_edma_init - eDMA module init
+ */
+static int __init
+mcf_edma_init(void)
+{
+ dev_t dev;
+ int result;
+ int i;
+#ifdef CONFIG_M54455
+ u32 offset;
+#endif
+
+#if defined(CONFIG_M5441X)
+ /* edma group priority, default grp0 > grp1 > grp2 > grp3 */
+ u32 grp0_pri = MCF_EDMA_CR_GRP0PRI(0x00);
+ u32 grp1_pri = MCF_EDMA_CR_GRP1PRI(0x01);
+ u32 grp2_pri = MCF_EDMA_CR_GRP2PRI(0x02);
+ u32 grp3_pri = MCF_EDMA_CR_GRP3PRI(0x03);
+#endif
+
+ DBG("Entry\n");
+
+ /* allocate free major number */
+ result =
+ alloc_chrdev_region(&dev, MCF_EDMA_DEV_MINOR, 1,
+ MCF_EDMA_DRIVER_NAME);
+ if (result < 0) {
+ ERR("Error %d can't get major number.\n", result);
+ return result;
+ }
+ mcf_edma_major = MAJOR(dev);
+
+ /* allocate device driver structure */
+ mcf_edma_devp = kmalloc(sizeof(struct mcf_edma_dev), GFP_KERNEL);
+ if (!mcf_edma_devp) {
+ result = -ENOMEM;
+ goto fail;
+ }
+
+ /* init handlers (no handlers for beginning) */
+ for (i = 0; i < MCF_EDMA_CHANNELS; i++) {
+ mcf_edma_devp->dma_interrupt_handlers[i].irq_handler = NULL;
+ mcf_edma_devp->dma_interrupt_handlers[i].error_handler = NULL;
+ mcf_edma_devp->dma_interrupt_handlers[i].arg = NULL;
+ mcf_edma_devp->dma_interrupt_handlers[i].allocated = 0;
+ mcf_edma_devp->dma_interrupt_handlers[i].lock = NULL;
+ mcf_edma_devp->dma_interrupt_handlers[i].device_id = NULL;
+ MCF_EDMA_TCD_CSR(i) = 0x0000;
+ }
+
+ /* register char device */
+ cdev_init(&mcf_edma_devp->cdev, &mcf_edma_fops);
+ mcf_edma_devp->cdev.owner = THIS_MODULE;
+ mcf_edma_devp->cdev.ops = &mcf_edma_fops;
+ result = cdev_add(&mcf_edma_devp->cdev, dev, 1);
+ if (result) {
+ ERR("Error %d adding coldfire-dma device.\n", result);
+ result = -ENODEV;
+ goto fail;
+ }
+
+ /* request/enable irq for each eDMA channel */
+#if defined(CONFIG_M5445X)
+ for (i = 0; i < MCF_EDMA_CHANNELS; i++) {
+ result = request_irq(MCF_EDMA_INT0_BASE + i,
+ mcf_edma_isr, IRQF_DISABLED,
+ MCF_EDMA_DRIVER_NAME, mcf_edma_devp);
+ if (result) {
+ ERR("Cannot request irq %d\n",
+ (MCF_EDMA_INT0_BASE + i));
+ result = -EBUSY;
+ goto fail;
+ }
+ }
+#elif defined(CONFIG_M5441X)
+ for (i = 0; i < MCF_EDMA_CHANNELS; i++) {
+ if (i >= 0 && i < MCF_EDMA_INT0_END) {
+ result = request_irq(MCF_EDMA_INT0_BASE + i,
+ mcf_edma_isr, IRQF_DISABLED,
+ MCF_EDMA_DRIVER_NAME,
+ mcf_edma_devp);
+
+ if (result) {
+ ERR("Cannot request irq %d\n",
+ (MCF_EDMA_INT0_BASE + i));
+ result = -EBUSY;
+ goto fail;
+ }
+ } else if (i >= MCF_EDMA_INT0_END && i < MCF_EDMA_INT1_END) {
+ result = request_irq(MCF_EDMA_INT1_BASE +
+ (i - MCF_EDMA_INT0_END),
+ mcf_edma_isr, IRQF_DISABLED,
+ MCF_EDMA_DRIVER_NAME,
+ mcf_edma_devp);
+
+ if (result) {
+ ERR("Cannot request irq %d\n",
+ (MCF_EDMA_INT1_BASE +
+ (i - MCF_EDMA_INT0_END)));
+ result = -EBUSY;
+ goto fail;
+ }
+ } else if (i >= MCF_EDMA_INT1_END && MCF_EDMA_INT2_END) {
+ result = request_irq(MCF_EDMA_INT2_BASE,
+ mcf_edma_isr, IRQF_DISABLED,
+ MCF_EDMA_DRIVER_NAME,
+ mcf_edma_devp);
+ if (result) {
+ ERR("Cannot request irq %d\n",
+ MCF_EDMA_INT2_BASE);
+ result = -EBUSY;
+ goto fail;
+ }
+ break;
+ } else {
+ ERR(" Cannot request irq because of wrong number!\n");
+ result = -EBUSY;
+ goto fail;
+ }
+ }
+#endif
+
+ /* request error interrupt */
+ result = request_irq(MCF_EDMA_INT0_BASE + MCF_EDMA_INT_ERR,
+ mcf_edma_error_isr, IRQF_DISABLED,
+ MCF_EDMA_DRIVER_NAME, mcf_edma_devp);
+ if (result) {
+ ERR("Cannot request irq %d\n",
+ (MCF_EDMA_INT0_BASE + MCF_EDMA_INT_ERR));
+ result = -EBUSY;
+ goto fail;
+ }
+
+#if defined(CONFIG_M5445X)
+ MCF_EDMA_CR = 0;
+#elif defined(CONFIG_M5441X)
+ MCF_EDMA_CR = (0 | grp0_pri | grp1_pri | grp2_pri | grp3_pri);
+ DBG("MCF_EDMA_CR = %lx\n", MCF_EDMA_CR);
+#endif
+
+#ifdef CONFIG_M54455
+ fsl_pata_dma_tcd.pata_tcd_va = (struct TCD *) dma_alloc_coherent(NULL,
+ MCF_EDMA_TCD_PER_CHAN + 1,
+ &fsl_pata_dma_tcd.pata_tcd_pa,
+ GFP_KERNEL);
+
+ if (!fsl_pata_dma_tcd.pata_tcd_va) {
+ printk(KERN_INFO "MCF eDMA alllocate tcd memeory failed\n");
+ goto fail;
+ }
+
+
+ offset = (fsl_pata_dma_tcd.pata_tcd_pa & (sizeof(struct TCD)-1)) ;
+ if (offset) {
+ /*
+ * up align the addr to 32B to match the eDMA enginee require,
+ * ie. sizeof tcd boundary
+ * */
+ printk(KERN_INFO "pata tcd original:pa-%x[%x]\n",
+ fsl_pata_dma_tcd.pata_tcd_pa,
+ (u32)fsl_pata_dma_tcd.pata_tcd_va);
+
+ fsl_pata_dma_tcd.pata_tcd_pa += sizeof(struct TCD) - offset;
+ fsl_pata_dma_tcd.pata_tcd_va += sizeof(struct TCD) - offset;
+
+ printk(KERN_INFO "pata tcd realigned:pa-%x[%x]\n",
+ fsl_pata_dma_tcd.pata_tcd_pa,
+ (u32)fsl_pata_dma_tcd.pata_tcd_va);
+ }
+#endif
+#ifdef CONFIG_PROC_FS
+ mcf_edma_proc_init();
+#endif
+
+ INFO("Initialized successfully\n");
+ return 0;
+fail:
+ mcf_edma_cleanup();
+ return result;
+}
+
+/**
+ * mcf_edma_exit - eDMA module exit
+ */
+static void __exit
+mcf_edma_exit(void)
+{
+ mcf_edma_cleanup();
+}
+
+#ifdef CONFIG_COLDFIRE_EDMA_MODULE
+module_init(mcf_edma_init);
+module_exit(mcf_edma_exit);
+#else
+/* get us in early */
+postcore_initcall(mcf_edma_init);
+#endif
+
+MODULE_DESCRIPTION(MCF_EDMA_DRIVER_INFO);
+MODULE_AUTHOR(MCF_EDMA_DRIVER_AUTHOR);
+MODULE_LICENSE(MCF_EDMA_DRIVER_LICENSE);
--- /dev/null
+++ b/drivers/dma/mcf_edma_test.c
@@ -0,0 +1,276 @@
+/*
+ * mcf_edma_test.c - simple test/example module for Coldfire eDMA.
+ *
+ * Copyright (C) 2008-2011 Freescale Semiconductor, Inc. All Rights Reserved.
+ * Author: Andrey Butok
+ *
+ * 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 29 February 2008 Andrey Butok
+ * Initial Release
+ *
+ * NOTE: This module tests eDMA driver performing
+ * a simple memory to memory transfer with a 32 bit
+ * source and destination transfer size that generates
+ * an interrupt when the transfer is complete.
+ */
+
+#include <linux/dma-mapping.h>
+#include <linux/init.h>
+#include <linux/fs.h>
+#include <linux/cdev.h>
+#include <linux/seq_file.h>
+#include <linux/proc_fs.h>
+#include <asm/mcfsim.h>
+#include <asm/coldfire.h>
+#include <asm/mcf_edma.h>
+#include <asm/cacheflush.h>
+
+#define MCF_EDMA_TEST_DRIVER_VERSION "Revision: 0.001"
+#define MCF_EDMA_TEST_DRIVER_AUTHOR \
+ "Freescale Semiconductor Inc, Andrey Butok"
+#define MCF_EDMA_TEST_DRIVER_DESC \
+ "Simple testing module for Coldfire eDMA "
+#define MCF_EDMA_TEST_DRIVER_INFO \
+ MCF_EDMA_TEST_DRIVER_VERSION " " MCF_EDMA_TEST_DRIVER_DESC
+#define MCF_EDMA_TEST_DRIVER_LICENSE "GPL"
+#define MCF_EDMA_TEST_DRIVER_NAME "mcf_edma_test"
+
+#ifndef TRUE
+#define TRUE 1
+#define FALSE 0
+#endif
+
+#define TEST_HALFIRQ
+
+/* Global variable used to signal main process when interrupt is recognized */
+static volatile int mcf_edma_test_interrupt;
+volatile int *mcf_edma_test_interrupt_p =
+ (volatile int *) &mcf_edma_test_interrupt;
+
+/********************************************************************/
+static irqreturn_t
+mcf_edma_test_handler(int channel, void *dev_id)
+{
+ int done = mcf_edma_check_done(channel);
+
+ /* Clear interrupt flag */
+ mcf_edma_confirm_interrupt_handled(channel);
+
+ if (done) {
+ printk(KERN_INFO "DMA Finished\n");
+
+ /* Set interrupt status flag to TRUE */
+ mcf_edma_test_interrupt = TRUE;
+ } else {
+ printk(KERN_INFO "DMA Halfway Done\n");
+
+ /* restart DMA. */
+ mcf_edma_confirm_halfirq(channel);
+ }
+
+ return IRQ_HANDLED;
+}
+
+static void
+mcf_edma_test_error_handler(int channel, void *dev_id)
+{
+ printk(KERN_INFO "DMA ERROR: Channel = %d\n", channel);
+ printk(KERN_INFO " EDMA_ES = 0x%lx\n", (MCF_EDMA_ES));
+ mcf_edma_dump_channel(channel);
+}
+
+/********************************************************************/
+
+int
+mcf_edma_test_block_compare(u8 *block1, u8 *block2, u32 size)
+{
+ u32 i;
+
+ for (i = 0; i < (size); i++) {
+ if ((*(u8 *) (block1 + i)) != (*(u8 *) (block2 + i))) {
+ printk(KERN_INFO "Data Mismatch index=0x%x len=0x%x "
+ "block1=0x%p block2=0x%p\n",
+ i, size, block1, block2);
+ return FALSE;
+ }
+ }
+
+ return TRUE;
+}
+
+/********************************************************************/
+
+void
+mcf_edma_test_run(void)
+{
+ u16 byte_count;
+ u32 i, j;
+ u8 *start_address;
+ u8 *dest_address;
+ u32 test_data;
+ int channel;
+ u32 allocated_channels_low = 0;
+ u32 allocated_channels_high = 0;
+
+ printk(KERN_INFO "\n===============================================\n");
+ printk(KERN_INFO "\nStarting eDMA transfer test!\n");
+
+ /* Initialize test variables */
+ byte_count = 0x2000;
+ test_data = 0xA5A5A5A5;
+
+ /* DMA buffer must be from GFP_DMA zone, so it will not be cached */
+ start_address = kmalloc(byte_count, GFP_DMA);
+ if (start_address == NULL) {
+ printk(KERN_INFO MCF_EDMA_TEST_DRIVER_NAME
+ ": failed to allocate DMA[%d] buffer\n", byte_count);
+ goto err_out;
+ }
+ dest_address = kmalloc(byte_count, /*GFP_KERNEL*/GFP_DMA);
+ if (dest_address == NULL) {
+ printk(KERN_INFO MCF_EDMA_TEST_DRIVER_NAME
+ ": failed to allocate DMA[%d] buffer\n", byte_count);
+ goto err_free_mem;
+ }
+
+ /* Test all automatically allocated DMA channels. The test data is
+ * complemented at the end of the loop, so that the testData value
+ * isn't the same twice in a row */
+ for (i = 0; i < MCF_EDMA_CHANNELS; i++) {
+ /* request eDMA channel */
+ channel = mcf_edma_request_channel(MCF_EDMA_CHANNEL_ANY,
+ mcf_edma_test_handler,
+ mcf_edma_test_error_handler,
+ 0x6,
+ NULL,
+ NULL,
+ MCF_EDMA_TEST_DRIVER_NAME);
+ if (channel < 0)
+ goto test_end;
+
+
+ if (channel >= 0 && channel < 32)
+ allocated_channels_low |= (1 << channel);
+ else if (channel >= 32 && channel < 64)
+ allocated_channels_high |= (1 << (channel - 32));
+
+ /* Initialize data for DMA to move */
+ for (j = 0; j < byte_count; j = j + 4) {
+ *((u32 *) (start_address + j)) = test_data;
+ *((u32 *) (dest_address + j)) = ~test_data;
+ }
+
+ /* Clear interrupt status indicator */
+ mcf_edma_test_interrupt = FALSE;
+
+ /* Configure DMA Channel TCD */
+#ifndef TEST_HALFIRQ
+ /* regular irq on completion */
+ mcf_edma_set_tcd_params(channel,
+ (u32)virt_to_phys(start_address),
+ (u32)virt_to_phys(dest_address),
+ (0 | MCF_EDMA_TCD_ATTR_SSIZE_32BIT |
+ MCF_EDMA_TCD_ATTR_DSIZE_32BIT), 0x04,
+ byte_count, 0x0, 1, 1, 0x04, 0x0, 0x1,
+ 0x0);
+#else
+ /* half completion irq */
+ mcf_edma_set_tcd_params_halfirq(channel,
+ (u32)virt_to_phys(start_address),
+ (u32)virt_to_phys(dest_address),
+ (MCF_EDMA_TCD_ATTR_SSIZE_32BIT |
+ MCF_EDMA_TCD_ATTR_DSIZE_32BIT),
+ 0x04, /* soff */
+ byte_count/2, /* bytes/loop */
+ 0x0, /* slast */
+ 2, /* loop count */
+ 0x04, /* doff */
+ 0x0, /* dlast_sga */
+ 0x0); /* req dis */
+#endif
+
+ printk(KERN_INFO "DMA Channel %d Bytes = 0x%x\n",
+ channel, byte_count);
+ /* Start DMA. */
+ mcf_edma_start_transfer(channel);
+
+ printk(KERN_INFO "DMA channel %d started.\n", channel);
+
+ /* Wait for DMA to complete */
+ while (!*mcf_edma_test_interrupt_p)
+ ;
+
+ /* Test data */
+ if (mcf_edma_test_block_compare
+ (start_address, dest_address, byte_count))
+ printk(KERN_INFO "Data are moved correctly.\n");
+ else
+ printk(KERN_INFO "ERROR!!! Data error!\n");
+
+ printk(KERN_INFO "DMA channel %d test complete.\n", channel);
+ printk(KERN_INFO "-------------------------------\n");
+
+ /* Complement test data so next channel test does not
+ * use same values */
+ test_data = ~test_data;
+ }
+
+test_end:
+ printk(KERN_INFO "All tests are complete\n\n");
+ printk(KERN_INFO
+ "It has been automatically allocated %d eDMA channels:\n", i);
+ for (i = 0; i < MCF_EDMA_CHANNELS; i++) {
+ if ((allocated_channels_low & (1 << i)) ||
+ (allocated_channels_high & (1 << (i - 32)))) {
+ printk(KERN_INFO "%d,\n", i);
+ mcf_edma_free_channel(i, NULL);
+ }
+ }
+ printk(KERN_INFO "===============================================\n\n");
+
+ kfree(dest_address);
+err_free_mem:
+ kfree(start_address);
+err_out:
+ return;
+}
+
+/********************************************************************/
+
+static int __init
+mcf_edma_test_init(void)
+{
+ mcf_edma_test_run();
+
+ /* We intentionaly return -EAGAIN to prevent keeping
+ * the module. It does all its work from init()
+ * and doesn't offer any runtime functionality */
+ return -EAGAIN;
+}
+
+static void __exit
+mcf_edma_test_exit(void)
+{
+}
+
+module_init(mcf_edma_test_init);
+module_exit(mcf_edma_test_exit);
+
+MODULE_DESCRIPTION(MCF_EDMA_TEST_DRIVER_INFO);
+MODULE_AUTHOR(MCF_EDMA_TEST_DRIVER_AUTHOR);
+MODULE_LICENSE(MCF_EDMA_TEST_DRIVER_LICENSE);
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