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: Ben Dooks <ben@simtec.co.uk> Cc: <linux-mmc@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>hifive-unleashed-5.1
Ben Dooks
Linus Torvalds
parent
e6130aeffd
commit
9bdd203b4d
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@ -17,6 +17,8 @@
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#include <linux/mmc/host.h>
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#include <linux/platform_device.h>
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#include <linux/cpufreq.h>
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#include <linux/debugfs.h>
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#include <linux/seq_file.h>
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#include <linux/gpio.h>
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#include <linux/irq.h>
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#include <linux/io.h>
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@ -1244,6 +1246,127 @@ static inline void s3cmci_cpufreq_deregister(struct s3cmci_host *host)
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#endif
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#ifdef CONFIG_DEBUG_FS
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static int s3cmci_state_show(struct seq_file *seq, void *v)
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{
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struct s3cmci_host *host = seq->private;
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seq_printf(seq, "Register base = 0x%08x\n", (u32)host->base);
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seq_printf(seq, "Clock rate = %ld\n", host->clk_rate);
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seq_printf(seq, "Prescale = %d\n", host->prescaler);
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seq_printf(seq, "is2440 = %d\n", host->is2440);
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seq_printf(seq, "IRQ = %d\n", host->irq);
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seq_printf(seq, "CD IRQ = %d\n", host->irq_cd);
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seq_printf(seq, "Do DMA = %d\n", host->dodma);
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seq_printf(seq, "SDIIMSK at %d\n", host->sdiimsk);
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seq_printf(seq, "SDIDATA at %d\n", host->sdidata);
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return 0;
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}
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static int s3cmci_state_open(struct inode *inode, struct file *file)
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{
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return single_open(file, s3cmci_state_show, inode->i_private);
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}
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static const struct file_operations s3cmci_fops_state = {
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.owner = THIS_MODULE,
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.open = s3cmci_state_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = single_release,
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};
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#define DBG_REG(_r) { .addr = S3C2410_SDI##_r, .name = #_r }
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struct s3cmci_reg {
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unsigned short addr;
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unsigned char *name;
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} debug_regs[] = {
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DBG_REG(CON),
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DBG_REG(PRE),
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DBG_REG(CMDARG),
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DBG_REG(CMDCON),
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DBG_REG(CMDSTAT),
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DBG_REG(RSP0),
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DBG_REG(RSP1),
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DBG_REG(RSP2),
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DBG_REG(RSP3),
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DBG_REG(TIMER),
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DBG_REG(BSIZE),
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DBG_REG(DCON),
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DBG_REG(DCNT),
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DBG_REG(DSTA),
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DBG_REG(FSTA),
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{}
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};
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static int s3cmci_regs_show(struct seq_file *seq, void *v)
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{
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struct s3cmci_host *host = seq->private;
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struct s3cmci_reg *rptr = debug_regs;
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for (; rptr->name; rptr++)
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seq_printf(seq, "SDI%s\t=0x%08x\n", rptr->name,
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readl(host->base + rptr->addr));
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seq_printf(seq, "SDIIMSK\t=0x%08x\n", readl(host->base + host->sdiimsk));
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return 0;
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}
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static int s3cmci_regs_open(struct inode *inode, struct file *file)
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{
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return single_open(file, s3cmci_regs_show, inode->i_private);
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}
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static const struct file_operations s3cmci_fops_regs = {
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.owner = THIS_MODULE,
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.open = s3cmci_regs_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = single_release,
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};
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static void s3cmci_debugfs_attach(struct s3cmci_host *host)
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{
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struct device *dev = &host->pdev->dev;
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host->debug_root = debugfs_create_dir(dev_name(dev), NULL);
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if (IS_ERR(host->debug_root)) {
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dev_err(dev, "failed to create debugfs root\n");
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return;
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}
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host->debug_state = debugfs_create_file("state", 0444,
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host->debug_root, host,
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&s3cmci_fops_state);
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if (IS_ERR(host->debug_state))
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dev_err(dev, "failed to create debug state file\n");
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host->debug_regs = debugfs_create_file("regs", 0444,
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host->debug_root, host,
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&s3cmci_fops_regs);
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if (IS_ERR(host->debug_regs))
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dev_err(dev, "failed to create debug regs file\n");
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}
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static void s3cmci_debugfs_remove(struct s3cmci_host *host)
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{
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debugfs_remove(host->debug_regs);
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debugfs_remove(host->debug_state);
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debugfs_remove(host->debug_root);
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}
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#else
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static inline void s3cmci_debugfs_attach(struct s3cmci_host *host) { }
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static inline void s3cmci_debugfs_remove(struct s3cmci_host *host) { }
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#endif /* CONFIG_DEBUG_FS */
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static int __devinit s3cmci_probe(struct platform_device *pdev)
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{
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struct s3cmci_host *host;
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@ -1435,6 +1558,8 @@ static int __devinit s3cmci_probe(struct platform_device *pdev)
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goto free_cpufreq;
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}
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s3cmci_debugfs_attach(host);
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platform_set_drvdata(pdev, mmc);
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dev_info(&pdev->dev, "initialisation done.\n");
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@ -1489,6 +1614,7 @@ static void s3cmci_shutdown(struct platform_device *pdev)
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if (host->irq_cd >= 0)
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free_irq(host->irq_cd, host);
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s3cmci_debugfs_remove(host);
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s3cmci_cpufreq_deregister(host);
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mmc_remove_host(mmc);
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clk_disable(host->clk);
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@ -68,6 +68,12 @@ struct s3cmci_host {
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unsigned int ccnt, dcnt;
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struct tasklet_struct pio_tasklet;
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#ifdef CONFIG_DEBUG_FS
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struct dentry *debug_root;
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struct dentry *debug_state;
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struct dentry *debug_regs;
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#endif
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#ifdef CONFIG_CPU_FREQ
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struct notifier_block freq_transition;
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#endif
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