Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 9bdd203b authored by Ben Dooks's avatar Ben Dooks Committed by Linus Torvalds
Browse files

s3cmci: add debugfs support for examining driver and hardware state 



Export driver state and hardware register state via debugfs entries
created under a directory formed from dev_name() on the probed device when
CONFIG_DEBUG_FS is set.

Signed-off-by: default avatarBen Dooks <ben@simtec.co.uk>
Cc: <linux-mmc@vger.kernel.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent e6130aef

drivers/mmc/host/s3cmci.c

+126 −0
Original line number Diff line number Diff line
@@ -17,6 +17,8 @@ 
#include <linux/mmc/host.h>

#include <linux/platform_device.h>

#include <linux/cpufreq.h>

#include <linux/debugfs.h>

#include <linux/seq_file.h>

#include <linux/gpio.h>

#include <linux/irq.h>

#include <linux/io.h>
@@ -1244,6 +1246,127 @@ static inline void s3cmci_cpufreq_deregister(struct s3cmci_host *host) 
#endif





#ifdef CONFIG_DEBUG_FS



static int s3cmci_state_show(struct seq_file *seq, void *v)

{

	struct s3cmci_host *host = seq->private;



	seq_printf(seq, "Register base = 0x%08x\n", (u32)host->base);

	seq_printf(seq, "Clock rate = %ld\n", host->clk_rate);

	seq_printf(seq, "Prescale = %d\n", host->prescaler);

	seq_printf(seq, "is2440 = %d\n", host->is2440);

	seq_printf(seq, "IRQ = %d\n", host->irq);

	seq_printf(seq, "CD IRQ = %d\n", host->irq_cd);

	seq_printf(seq, "Do DMA = %d\n", host->dodma);

	seq_printf(seq, "SDIIMSK at %d\n", host->sdiimsk);

	seq_printf(seq, "SDIDATA at %d\n", host->sdidata);



	return 0;

}



static int s3cmci_state_open(struct inode *inode, struct file *file)

{

	return single_open(file, s3cmci_state_show, inode->i_private);

}



static const struct file_operations s3cmci_fops_state = {

	.owner		= THIS_MODULE,

	.open		= s3cmci_state_open,

	.read		= seq_read,

	.llseek		= seq_lseek,

	.release	= single_release,

};



#define DBG_REG(_r) { .addr = S3C2410_SDI##_r, .name = #_r }



struct s3cmci_reg {

	unsigned short	addr;

	unsigned char	*name;

} debug_regs[] = {

	DBG_REG(CON),

	DBG_REG(PRE),

	DBG_REG(CMDARG),

	DBG_REG(CMDCON),

	DBG_REG(CMDSTAT),

	DBG_REG(RSP0),

	DBG_REG(RSP1),

	DBG_REG(RSP2),

	DBG_REG(RSP3),

	DBG_REG(TIMER),

	DBG_REG(BSIZE),

	DBG_REG(DCON),

	DBG_REG(DCNT),

	DBG_REG(DSTA),

	DBG_REG(FSTA),

	{}

};



static int s3cmci_regs_show(struct seq_file *seq, void *v)

{

	struct s3cmci_host *host = seq->private;

	struct s3cmci_reg *rptr = debug_regs;



	for (; rptr->name; rptr++)

		seq_printf(seq, "SDI%s\t=0x%08x\n", rptr->name,

			   readl(host->base + rptr->addr));



	seq_printf(seq, "SDIIMSK\t=0x%08x\n", readl(host->base + host->sdiimsk));



	return 0;

}



static int s3cmci_regs_open(struct inode *inode, struct file *file)

{

	return single_open(file, s3cmci_regs_show, inode->i_private);

}



static const struct file_operations s3cmci_fops_regs = {

	.owner		= THIS_MODULE,

	.open		= s3cmci_regs_open,

	.read		= seq_read,

	.llseek		= seq_lseek,

	.release	= single_release,

};



static void s3cmci_debugfs_attach(struct s3cmci_host *host)

{

	struct device *dev = &host->pdev->dev;



	host->debug_root = debugfs_create_dir(dev_name(dev), NULL);

	if (IS_ERR(host->debug_root)) {

		dev_err(dev, "failed to create debugfs root\n");

		return;

	}



	host->debug_state = debugfs_create_file("state", 0444,

						host->debug_root, host,

						&s3cmci_fops_state);



	if (IS_ERR(host->debug_state))

		dev_err(dev, "failed to create debug state file\n");



	host->debug_regs = debugfs_create_file("regs", 0444,

					       host->debug_root, host,

					       &s3cmci_fops_regs);



	if (IS_ERR(host->debug_regs))

		dev_err(dev, "failed to create debug regs file\n");

}



static void s3cmci_debugfs_remove(struct s3cmci_host *host)

{

	debugfs_remove(host->debug_regs);

	debugfs_remove(host->debug_state);

	debugfs_remove(host->debug_root);

}



#else

static inline void s3cmci_debugfs_attach(struct s3cmci_host *host) { }

static inline void s3cmci_debugfs_remove(struct s3cmci_host *host) { }



#endif /* CONFIG_DEBUG_FS */



static int __devinit s3cmci_probe(struct platform_device *pdev)

{

	struct s3cmci_host *host;
@@ -1435,6 +1558,8 @@ static int __devinit s3cmci_probe(struct platform_device *pdev) 
		goto free_cpufreq;

	}



	s3cmci_debugfs_attach(host);



	platform_set_drvdata(pdev, mmc);

	dev_info(&pdev->dev, "initialisation done.\n");
@@ -1489,6 +1614,7 @@ static void s3cmci_shutdown(struct platform_device *pdev) 
	if (host->irq_cd >= 0)

		free_irq(host->irq_cd, host);



	s3cmci_debugfs_remove(host);

	s3cmci_cpufreq_deregister(host);

	mmc_remove_host(mmc);

	clk_disable(host->clk);

drivers/mmc/host/s3cmci.h

+6 −0
Original line number Diff line number Diff line
@@ -68,6 +68,12 @@ struct s3cmci_host { 
	unsigned int		ccnt, dcnt;

	struct tasklet_struct	pio_tasklet;



#ifdef CONFIG_DEBUG_FS

	struct dentry		*debug_root;

	struct dentry		*debug_state;

	struct dentry		*debug_regs;

#endif



#ifdef CONFIG_CPU_FREQ

	struct notifier_block	freq_transition;

#endif