ARM: pxa: remove platform dma code

As the last pxa related driver was converted to dmaengine, it's time to
kill the legacy dma code, which is not used anymore.

This finishes the pxa dmaengine transition.

Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>

1 files changed, 0 insertions, 386 deletions

diff --git a/arch/arm/plat-pxa/dma.c b/arch/arm/plat-pxa/dma.c
deleted file mode 100644
index de2b061889ec..000000000000
--- a/arch/arm/plat-pxa/dma.c
+++ /dev/null
@@ -1,386 +0,0 @@
-/*
- *  linux/arch/arm/plat-pxa/dma.c
- *
- *  PXA DMA registration and IRQ dispatching
- *
- *  Author:	Nicolas Pitre
- *  Created:	Nov 15, 2001
- *  Copyright:	MontaVista Software Inc.
- *
- *  This program is free software; you can redistribute it and/or modify
- *  it under the terms of the GNU General Public License version 2 as
- *  published by the Free Software Foundation.
- */
-
-#include <linux/module.h>
-#include <linux/init.h>
-#include <linux/slab.h>
-#include <linux/kernel.h>
-#include <linux/interrupt.h>
-#include <linux/errno.h>
-#include <linux/dma-mapping.h>
-
-#include <asm/irq.h>
-#include <asm/memory.h>
-#include <mach/hardware.h>
-#include <mach/dma.h>
-
-#define DMA_DEBUG_NAME		"pxa_dma"
-#define DMA_MAX_REQUESTERS	64
-
-struct dma_channel {
-	char *name;
-	pxa_dma_prio prio;
-	void (*irq_handler)(int, void *);
-	void *data;
-	spinlock_t lock;
-};
-
-static struct dma_channel *dma_channels;
-static int num_dma_channels;
-
-/*
- * Debug fs
- */
-#ifdef CONFIG_DEBUG_FS
-#include <linux/debugfs.h>
-#include <linux/uaccess.h>
-#include <linux/seq_file.h>
-
-static struct dentry *dbgfs_root, *dbgfs_state, **dbgfs_chan;
-
-static int dbg_show_requester_chan(struct seq_file *s, void *p)
-{
-	int chan = (int)s->private;
-	int i;
-	u32 drcmr;
-
-	seq_printf(s, "DMA channel %d requesters list :\n", chan);
-	for (i = 0; i < DMA_MAX_REQUESTERS; i++) {
-		drcmr = DRCMR(i);
-		if ((drcmr & DRCMR_CHLNUM) == chan)
-			seq_printf(s, "\tRequester %d (MAPVLD=%d)\n",
-				   i, !!(drcmr & DRCMR_MAPVLD));
-	}
-
-	return 0;
-}
-
-static inline int dbg_burst_from_dcmd(u32 dcmd)
-{
-	int burst = (dcmd >> 16) & 0x3;
-
-	return burst ? 4 << burst : 0;
-}
-
-static int is_phys_valid(unsigned long addr)
-{
-	return pfn_valid(__phys_to_pfn(addr));
-}
-
-#define DCSR_STR(flag) (dcsr & DCSR_##flag ? #flag" " : "")
-#define DCMD_STR(flag) (dcmd & DCMD_##flag ? #flag" " : "")
-
-static int dbg_show_descriptors(struct seq_file *s, void *p)
-{
-	int chan = (int)s->private;
-	int i, max_show = 20, burst, width;
-	u32 dcmd;
-	unsigned long phys_desc;
-	struct pxa_dma_desc *desc;
-	unsigned long flags;
-
-	spin_lock_irqsave(&dma_channels[chan].lock, flags);
-	phys_desc = DDADR(chan);
-
-	seq_printf(s, "DMA channel %d descriptors :\n", chan);
-	seq_printf(s, "[%03d] First descriptor unknown\n", 0);
-	for (i = 1; i < max_show && is_phys_valid(phys_desc); i++) {
-		desc = phys_to_virt(phys_desc);
-		dcmd = desc->dcmd;
-		burst = dbg_burst_from_dcmd(dcmd);
-		width = (1 << ((dcmd >> 14) & 0x3)) >> 1;
-
-		seq_printf(s, "[%03d] Desc at %08lx(virt %p)\n",
-			   i, phys_desc, desc);
-		seq_printf(s, "\tDDADR = %08x\n", desc->ddadr);
-		seq_printf(s, "\tDSADR = %08x\n", desc->dsadr);
-		seq_printf(s, "\tDTADR = %08x\n", desc->dtadr);
-		seq_printf(s, "\tDCMD  = %08x (%s%s%s%s%s%s%sburst=%d width=%d len=%d)\n",
-			   dcmd,
-			   DCMD_STR(INCSRCADDR), DCMD_STR(INCTRGADDR),
-			   DCMD_STR(FLOWSRC), DCMD_STR(FLOWTRG),
-			   DCMD_STR(STARTIRQEN), DCMD_STR(ENDIRQEN),
-			   DCMD_STR(ENDIAN), burst, width,
-			   dcmd & DCMD_LENGTH);
-		phys_desc = desc->ddadr;
-	}
-	if (i == max_show)
-		seq_printf(s, "[%03d] Desc at %08lx ... max display reached\n",
-			   i, phys_desc);
-	else
-		seq_printf(s, "[%03d] Desc at %08lx is %s\n",
-			   i, phys_desc, phys_desc == DDADR_STOP ?
-			   "DDADR_STOP" : "invalid");
-
-	spin_unlock_irqrestore(&dma_channels[chan].lock, flags);
-
-	return 0;
-}
-
-static int dbg_show_chan_state(struct seq_file *s, void *p)
-{
-	int chan = (int)s->private;
-	u32 dcsr, dcmd;
-	int burst, width;
-	static char *str_prio[] = { "high", "normal", "low" };
-
-	dcsr = DCSR(chan);
-	dcmd = DCMD(chan);
-	burst = dbg_burst_from_dcmd(dcmd);
-	width = (1 << ((dcmd >> 14) & 0x3)) >> 1;
-
-	seq_printf(s, "DMA channel %d\n", chan);
-	seq_printf(s, "\tPriority : %s\n", str_prio[dma_channels[chan].prio]);
-	seq_printf(s, "\tUnaligned transfer bit: %s\n",
-		   DALGN & (1 << chan) ? "yes" : "no");
-	seq_printf(s, "\tDCSR  = %08x (%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s)\n",
-		   dcsr, DCSR_STR(RUN), DCSR_STR(NODESC),
-		   DCSR_STR(STOPIRQEN), DCSR_STR(EORIRQEN),
-		   DCSR_STR(EORJMPEN), DCSR_STR(EORSTOPEN),
-		   DCSR_STR(SETCMPST), DCSR_STR(CLRCMPST),
-		   DCSR_STR(CMPST), DCSR_STR(EORINTR), DCSR_STR(REQPEND),
-		   DCSR_STR(STOPSTATE), DCSR_STR(ENDINTR),
-		   DCSR_STR(STARTINTR), DCSR_STR(BUSERR));
-
-	seq_printf(s, "\tDCMD  = %08x (%s%s%s%s%s%s%sburst=%d width=%d len=%d)\n",
-		   dcmd,
-		   DCMD_STR(INCSRCADDR), DCMD_STR(INCTRGADDR),
-		   DCMD_STR(FLOWSRC), DCMD_STR(FLOWTRG),
-		   DCMD_STR(STARTIRQEN), DCMD_STR(ENDIRQEN),
-		   DCMD_STR(ENDIAN), burst, width, dcmd & DCMD_LENGTH);
-	seq_printf(s, "\tDSADR = %08x\n", DSADR(chan));
-	seq_printf(s, "\tDTADR = %08x\n", DTADR(chan));
-	seq_printf(s, "\tDDADR = %08x\n", DDADR(chan));
-
-	return 0;
-}
-
-static int dbg_show_state(struct seq_file *s, void *p)
-{
-	/* basic device status */
-	seq_puts(s, "DMA engine status\n");
-	seq_printf(s, "\tChannel number: %d\n", num_dma_channels);
-
-	return 0;
-}
-
-#define DBGFS_FUNC_DECL(name) \
-static int dbg_open_##name(struct inode *inode, struct file *file) \
-{ \
-	return single_open(file, dbg_show_##name, inode->i_private); \
-} \
-static const struct file_operations dbg_fops_##name = { \
-	.owner		= THIS_MODULE, \
-	.open		= dbg_open_##name, \
-	.llseek		= seq_lseek, \
-	.read		= seq_read, \
-	.release	= single_release, \
-}
-
-DBGFS_FUNC_DECL(state);
-DBGFS_FUNC_DECL(chan_state);
-DBGFS_FUNC_DECL(descriptors);
-DBGFS_FUNC_DECL(requester_chan);
-
-static struct dentry *pxa_dma_dbg_alloc_chan(int ch, struct dentry *chandir)
-{
-	char chan_name[11];
-	struct dentry *chan, *chan_state = NULL, *chan_descr = NULL;
-	struct dentry *chan_reqs = NULL;
-	void *dt;
-
-	scnprintf(chan_name, sizeof(chan_name), "%d", ch);
-	chan = debugfs_create_dir(chan_name, chandir);
-	dt = (void *)ch;
-
-	if (chan)
-		chan_state = debugfs_create_file("state", 0400, chan, dt,
-						 &dbg_fops_chan_state);
-	if (chan_state)
-		chan_descr = debugfs_create_file("descriptors", 0400, chan, dt,
-						 &dbg_fops_descriptors);
-	if (chan_descr)
-		chan_reqs = debugfs_create_file("requesters", 0400, chan, dt,
-						&dbg_fops_requester_chan);
-	if (!chan_reqs)
-		goto err_state;
-
-	return chan;
-
-err_state:
-	debugfs_remove_recursive(chan);
-	return NULL;
-}
-
-static void pxa_dma_init_debugfs(void)
-{
-	int i;
-	struct dentry *chandir;
-
-	dbgfs_root = debugfs_create_dir(DMA_DEBUG_NAME, NULL);
-	if (IS_ERR(dbgfs_root) || !dbgfs_root)
-		goto err_root;
-
-	dbgfs_state = debugfs_create_file("state", 0400, dbgfs_root, NULL,
-					  &dbg_fops_state);
-	if (!dbgfs_state)
-		goto err_state;
-
-	dbgfs_chan = kmalloc(sizeof(*dbgfs_state) * num_dma_channels,
-			     GFP_KERNEL);
-	if (!dbgfs_chan)
-		goto err_alloc;
-
-	chandir = debugfs_create_dir("channels", dbgfs_root);
-	if (!chandir)
-		goto err_chandir;
-
-	for (i = 0; i < num_dma_channels; i++) {
-		dbgfs_chan[i] = pxa_dma_dbg_alloc_chan(i, chandir);
-		if (!dbgfs_chan[i])
-			goto err_chans;
-	}
-
-	return;
-err_chans:
-err_chandir:
-	kfree(dbgfs_chan);
-err_alloc:
-err_state:
-	debugfs_remove_recursive(dbgfs_root);
-err_root:
-	pr_err("pxa_dma: debugfs is not available\n");
-}
-
-static void __exit pxa_dma_cleanup_debugfs(void)
-{
-	debugfs_remove_recursive(dbgfs_root);
-}
-#else
-static inline void pxa_dma_init_debugfs(void) {}
-static inline void pxa_dma_cleanup_debugfs(void) {}
-#endif
-
-int pxa_request_dma (char *name, pxa_dma_prio prio,
-			void (*irq_handler)(int, void *),
-			void *data)
-{
-	unsigned long flags;
-	int i, found = 0;
-
-	/* basic sanity checks */
-	if (!name || !irq_handler)
-		return -EINVAL;
-
-	local_irq_save(flags);
-
-	do {
-		/* try grabbing a DMA channel with the requested priority */
-		for (i = 0; i < num_dma_channels; i++) {
-			if ((dma_channels[i].prio == prio) &&
-			    !dma_channels[i].name &&
-			    !pxad_toggle_reserved_channel(i)) {
-				found = 1;
-				break;
-			}
-		}
-		/* if requested prio group is full, try a hier priority */
-	} while (!found && prio--);
-
-	if (found) {
-		DCSR(i) = DCSR_STARTINTR|DCSR_ENDINTR|DCSR_BUSERR;
-		dma_channels[i].name = name;
-		dma_channels[i].irq_handler = irq_handler;
-		dma_channels[i].data = data;
-	} else {
-		printk (KERN_WARNING "No more available DMA channels for %s\n", name);
-		i = -ENODEV;
-	}
-
-	local_irq_restore(flags);
-	return i;
-}
-EXPORT_SYMBOL(pxa_request_dma);
-
-void pxa_free_dma (int dma_ch)
-{
-	unsigned long flags;
-
-	if (!dma_channels[dma_ch].name) {
-		printk (KERN_CRIT
-			"%s: trying to free channel %d which is already freed\n",
-			__func__, dma_ch);
-		return;
-	}
-
-	local_irq_save(flags);
-	DCSR(dma_ch) = DCSR_STARTINTR|DCSR_ENDINTR|DCSR_BUSERR;
-	dma_channels[dma_ch].name = NULL;
-	pxad_toggle_reserved_channel(dma_ch);
-	local_irq_restore(flags);
-}
-EXPORT_SYMBOL(pxa_free_dma);
-
-static irqreturn_t dma_irq_handler(int irq, void *dev_id)
-{
-	int i, dint = DINT, done = 0;
-	struct dma_channel *channel;
-
-	while (dint) {
-		i = __ffs(dint);
-		dint &= (dint - 1);
-		channel = &dma_channels[i];
-		if (channel->name && channel->irq_handler) {
-			channel->irq_handler(i, channel->data);
-			done++;
-		}
-	}
-	if (done)
-		return IRQ_HANDLED;
-	else
-		return IRQ_NONE;
-}
-
-int __init pxa_init_dma(int irq, int num_ch)
-{
-	int i, ret;
-
-	dma_channels = kzalloc(sizeof(struct dma_channel) * num_ch, GFP_KERNEL);
-	if (dma_channels == NULL)
-		return -ENOMEM;
-
-	/* dma channel priorities on pxa2xx processors:
-	 * ch 0 - 3,  16 - 19  <--> (0) DMA_PRIO_HIGH
-	 * ch 4 - 7,  20 - 23  <--> (1) DMA_PRIO_MEDIUM
-	 * ch 8 - 15, 24 - 31  <--> (2) DMA_PRIO_LOW
-	 */
-	for (i = 0; i < num_ch; i++) {
-		DCSR(i) = 0;
-		dma_channels[i].prio = min((i & 0xf) >> 2, DMA_PRIO_LOW);
-		spin_lock_init(&dma_channels[i].lock);
-	}
-
-	ret = request_irq(irq, dma_irq_handler, IRQF_SHARED, "DMA",
-			  dma_channels);
-	if (ret) {
-		printk (KERN_CRIT "Wow!  Can't register IRQ for DMA\n");
-		kfree(dma_channels);
-		return ret;
-	}
-	num_dma_channels = num_ch;
-
-	pxa_dma_init_debugfs();
-
-	return 0;
-}