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Commit c01d1b51 authored by Robert Jarzmik's avatar Robert Jarzmik Committed by Vinod Koul
Browse files

dmaengine: pxa_dma: add debug information 



Reuse the debugging features which were available in pxa architecture.
This is a copy of the code from arch/arm/plat-pxa/dma, which is doomed
to disappear once the conversion is completed towards dmaengine.

This is a transfer of the commit "[ARM] pxa/dma: add debugfs
entries" (d294948c).

Signed-off-by: default avatarRobert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: default avatarVinod Koul <vinod.koul@intel.com>
parent a57e16cf

drivers/dma/pxa_dma.c

+244 −0
Original line number Diff line number Diff line
@@ -125,6 +125,11 @@ struct pxad_device { 
	void __iomem			*base;

	struct pxad_phy			*phys;

	spinlock_t			phy_lock;	/* Phy association */

#ifdef CONFIG_DEBUG_FS

	struct dentry			*dbgfs_root;

	struct dentry			*dbgfs_state;

	struct dentry			**dbgfs_chan;

#endif

};



#define tx_to_pxad_desc(tx)					\
@@ -168,6 +173,243 @@ static unsigned int pxad_drcmr(unsigned int line) 
		return 0x100 + line * 4;

	return 0x1000 + line * 4;

}



/*

 * Debug fs

 */

#ifdef CONFIG_DEBUG_FS

#include <linux/debugfs.h>

#include <linux/uaccess.h>

#include <linux/seq_file.h>



static int dbg_show_requester_chan(struct seq_file *s, void *p)

{

	int pos = 0;

	struct pxad_phy *phy = s->private;

	int i;

	u32 drcmr;



	pos += seq_printf(s, "DMA channel %d requester :\n", phy->idx);

	for (i = 0; i < 70; i++) {

		drcmr = readl_relaxed(phy->base + pxad_drcmr(i));

		if ((drcmr & DRCMR_CHLNUM) == phy->idx)

			pos += seq_printf(s, "\tRequester %d (MAPVLD=%d)\n", i,

					  !!(drcmr & DRCMR_MAPVLD));

	}

	return pos;

}



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 PXA_DCSR_STR(flag) (dcsr & PXA_DCSR_##flag ? #flag" " : "")

#define PXA_DCMD_STR(flag) (dcmd & PXA_DCMD_##flag ? #flag" " : "")



static int dbg_show_descriptors(struct seq_file *s, void *p)

{

	struct pxad_phy *phy = s->private;

	int i, max_show = 20, burst, width;

	u32 dcmd;

	unsigned long phys_desc, ddadr;

	struct pxad_desc_hw *desc;



	phys_desc = ddadr = _phy_readl_relaxed(phy, DDADR);



	seq_printf(s, "DMA channel %d descriptors :\n", phy->idx);

	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,

			   PXA_DCMD_STR(INCSRCADDR), PXA_DCMD_STR(INCTRGADDR),

			   PXA_DCMD_STR(FLOWSRC), PXA_DCMD_STR(FLOWTRG),

			   PXA_DCMD_STR(STARTIRQEN), PXA_DCMD_STR(ENDIRQEN),

			   PXA_DCMD_STR(ENDIAN), burst, width,

			   dcmd & PXA_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");



	return 0;

}



static int dbg_show_chan_state(struct seq_file *s, void *p)

{

	struct pxad_phy *phy = s->private;

	u32 dcsr, dcmd;

	int burst, width;

	static const char * const str_prio[] = {

		"high", "normal", "low", "invalid"

	};



	dcsr = _phy_readl_relaxed(phy, DCSR);

	dcmd = _phy_readl_relaxed(phy, DCMD);

	burst = dbg_burst_from_dcmd(dcmd);

	width = (1 << ((dcmd >> 14) & 0x3)) >> 1;



	seq_printf(s, "DMA channel %d\n", phy->idx);

	seq_printf(s, "\tPriority : %s\n",

			  str_prio[(phy->idx & 0xf) / 4]);

	seq_printf(s, "\tUnaligned transfer bit: %s\n",

			  _phy_readl_relaxed(phy, DALGN) & BIT(phy->idx) ?

			  "yes" : "no");

	seq_printf(s, "\tDCSR  = %08x (%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s)\n",

		   dcsr, PXA_DCSR_STR(RUN), PXA_DCSR_STR(NODESC),

		   PXA_DCSR_STR(STOPIRQEN), PXA_DCSR_STR(EORIRQEN),

		   PXA_DCSR_STR(EORJMPEN), PXA_DCSR_STR(EORSTOPEN),

		   PXA_DCSR_STR(SETCMPST), PXA_DCSR_STR(CLRCMPST),

		   PXA_DCSR_STR(CMPST), PXA_DCSR_STR(EORINTR),

		   PXA_DCSR_STR(REQPEND), PXA_DCSR_STR(STOPSTATE),

		   PXA_DCSR_STR(ENDINTR), PXA_DCSR_STR(STARTINTR),

		   PXA_DCSR_STR(BUSERR));



	seq_printf(s, "\tDCMD  = %08x (%s%s%s%s%s%s%sburst=%d width=%d len=%d)\n",

		   dcmd,

		   PXA_DCMD_STR(INCSRCADDR), PXA_DCMD_STR(INCTRGADDR),

		   PXA_DCMD_STR(FLOWSRC), PXA_DCMD_STR(FLOWTRG),

		   PXA_DCMD_STR(STARTIRQEN), PXA_DCMD_STR(ENDIRQEN),

		   PXA_DCMD_STR(ENDIAN), burst, width, dcmd & PXA_DCMD_LENGTH);

	seq_printf(s, "\tDSADR = %08x\n", _phy_readl_relaxed(phy, DSADR));

	seq_printf(s, "\tDTADR = %08x\n", _phy_readl_relaxed(phy, DTADR));

	seq_printf(s, "\tDDADR = %08x\n", _phy_readl_relaxed(phy, DDADR));



	return 0;

}



static int dbg_show_state(struct seq_file *s, void *p)

{

	struct pxad_device *pdev = s->private;



	/* basic device status */

	seq_puts(s, "DMA engine status\n");

	seq_printf(s, "\tChannel number: %d\n", pdev->nr_chans);



	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 *pxad_dbg_alloc_chan(struct pxad_device *pdev,

					     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 *)&pdev->phys[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 pxad_init_debugfs(struct pxad_device *pdev)

{

	int i;

	struct dentry *chandir;



	pdev->dbgfs_root = debugfs_create_dir(dev_name(pdev->slave.dev), NULL);

	if (IS_ERR(pdev->dbgfs_root) || !pdev->dbgfs_root)

		goto err_root;



	pdev->dbgfs_state = debugfs_create_file("state", 0400, pdev->dbgfs_root,

						pdev, &dbg_fops_state);

	if (!pdev->dbgfs_state)

		goto err_state;



	pdev->dbgfs_chan =

		kmalloc_array(pdev->nr_chans, sizeof(*pdev->dbgfs_state),

			      GFP_KERNEL);

	if (!pdev->dbgfs_chan)

		goto err_alloc;



	chandir = debugfs_create_dir("channels", pdev->dbgfs_root);

	if (!chandir)

		goto err_chandir;



	for (i = 0; i < pdev->nr_chans; i++) {

		pdev->dbgfs_chan[i] = pxad_dbg_alloc_chan(pdev, i, chandir);

		if (!pdev->dbgfs_chan[i])

			goto err_chans;

	}



	return;

err_chans:

err_chandir:

	kfree(pdev->dbgfs_chan);

err_alloc:

err_state:

	debugfs_remove_recursive(pdev->dbgfs_root);

err_root:

	pr_err("pxad: debugfs is not available\n");

}



static void pxad_cleanup_debugfs(struct pxad_device *pdev)

{

	debugfs_remove_recursive(pdev->dbgfs_root);

}

#else

static inline void pxad_init_debugfs(struct pxad_device *pdev) {}

static inline void pxad_cleanup_debugfs(struct pxad_device *pdev) {}

#endif



static struct pxad_phy *lookup_phy(struct pxad_chan *pchan)

{

	int prio, i;
@@ -982,6 +1224,7 @@ static int pxad_remove(struct platform_device *op) 
{

	struct pxad_device *pdev = platform_get_drvdata(op);



	pxad_cleanup_debugfs(pdev);

	pxad_free_channels(&pdev->slave);

	dma_async_device_unregister(&pdev->slave);

	return 0;
@@ -1154,6 +1397,7 @@ static int pxad_probe(struct platform_device *op) 
	}



	platform_set_drvdata(op, pdev);

	pxad_init_debugfs(pdev);

	dev_info(pdev->slave.dev, "initialized %d channels\n", dma_channels);

	return 0;

}