diff options
Diffstat (limited to 'arch/arm/mach-omap2/mux.c')
| -rw-r--r-- | arch/arm/mach-omap2/mux.c | 227 |
1 files changed, 227 insertions, 0 deletions
diff --git a/arch/arm/mach-omap2/mux.c b/arch/arm/mach-omap2/mux.c index b082b504de8..d9684331e08 100644 --- a/arch/arm/mach-omap2/mux.c +++ b/arch/arm/mach-omap2/mux.c @@ -28,6 +28,10 @@ #include <linux/io.h> #include <linux/spinlock.h> #include <linux/list.h> +#include <linux/ctype.h> +#include <linux/debugfs.h> +#include <linux/seq_file.h> +#include <linux/uaccess.h> #include <asm/system.h> @@ -44,6 +48,7 @@ struct omap_mux_entry { struct list_head node; }; +static unsigned long mux_phys; static void __iomem *mux_base; static inline u16 omap_mux_read(u16 reg) @@ -807,6 +812,225 @@ int __init omap_mux_init_signal(char *muxname, int val) return -ENODEV; } +#ifdef CONFIG_DEBUG_FS + +#define OMAP_MUX_MAX_NR_FLAGS 10 +#define OMAP_MUX_TEST_FLAG(val, mask) \ + if (((val) & (mask)) == (mask)) { \ + i++; \ + flags[i] = #mask; \ + } + +/* REVISIT: Add checking for non-optimal mux settings */ +static inline void omap_mux_decode(struct seq_file *s, u16 val) +{ + char *flags[OMAP_MUX_MAX_NR_FLAGS]; + char mode[14]; + int i = -1; + + sprintf(mode, "OMAP_MUX_MODE%d", val & 0x7); + i++; + flags[i] = mode; + + OMAP_MUX_TEST_FLAG(val, OMAP_PIN_OFF_WAKEUPENABLE); + if (val & OMAP_OFF_EN) { + if (!(val & OMAP_OFFOUT_EN)) { + if (!(val & OMAP_OFF_PULL_UP)) { + OMAP_MUX_TEST_FLAG(val, + OMAP_PIN_OFF_INPUT_PULLDOWN); + } else { + OMAP_MUX_TEST_FLAG(val, + OMAP_PIN_OFF_INPUT_PULLUP); + } + } else { + if (!(val & OMAP_OFFOUT_VAL)) { + OMAP_MUX_TEST_FLAG(val, + OMAP_PIN_OFF_OUTPUT_LOW); + } else { + OMAP_MUX_TEST_FLAG(val, + OMAP_PIN_OFF_OUTPUT_HIGH); + } + } + } + + if (val & OMAP_INPUT_EN) { + if (val & OMAP_PULL_ENA) { + if (!(val & OMAP_PULL_UP)) { + OMAP_MUX_TEST_FLAG(val, + OMAP_PIN_INPUT_PULLDOWN); + } else { + OMAP_MUX_TEST_FLAG(val, OMAP_PIN_INPUT_PULLUP); + } + } else { + OMAP_MUX_TEST_FLAG(val, OMAP_PIN_INPUT); + } + } else { + i++; + flags[i] = "OMAP_PIN_OUTPUT"; + } + + do { + seq_printf(s, "%s", flags[i]); + if (i > 0) + seq_printf(s, " | "); + } while (i-- > 0); +} + +#define OMAP_MUX_DEFNAME_LEN 16 + +static int omap_mux_dbg_board_show(struct seq_file *s, void *unused) +{ + struct omap_mux_entry *e; + + list_for_each_entry(e, &muxmodes, node) { + struct omap_mux *m = &e->mux; + char m0_def[OMAP_MUX_DEFNAME_LEN]; + char *m0_name = m->muxnames[0]; + u16 val; + int i, mode; + + if (!m0_name) + continue; + + for (i = 0; i < OMAP_MUX_DEFNAME_LEN; i++) { + if (m0_name[i] == '\0') { + m0_def[i] = m0_name[i]; + break; + } + m0_def[i] = toupper(m0_name[i]); + } + val = omap_mux_read(m->reg_offset); + mode = val & OMAP_MUX_MODE7; + + seq_printf(s, "OMAP%i_MUX(%s, ", + cpu_is_omap34xx() ? 3 : 0, m0_def); + omap_mux_decode(s, val); + seq_printf(s, "),\n"); + } + + return 0; +} + +static int omap_mux_dbg_board_open(struct inode *inode, struct file *file) +{ + return single_open(file, omap_mux_dbg_board_show, &inode->i_private); +} + +static const struct file_operations omap_mux_dbg_board_fops = { + .open = omap_mux_dbg_board_open, + .read = seq_read, + .llseek = seq_lseek, + .release = single_release, +}; + +static int omap_mux_dbg_signal_show(struct seq_file *s, void *unused) +{ + struct omap_mux *m = s->private; + const char *none = "NA"; + u16 val; + int mode; + + val = omap_mux_read(m->reg_offset); + mode = val & OMAP_MUX_MODE7; + + seq_printf(s, "name: %s.%s (0x%08lx/0x%03x = 0x%04x), b %s, t %s\n", + m->muxnames[0], m->muxnames[mode], + mux_phys + m->reg_offset, m->reg_offset, val, + m->balls[0] ? m->balls[0] : none, + m->balls[1] ? m->balls[1] : none); + seq_printf(s, "mode: "); + omap_mux_decode(s, val); + seq_printf(s, "\n"); + seq_printf(s, "signals: %s | %s | %s | %s | %s | %s | %s | %s\n", + m->muxnames[0] ? m->muxnames[0] : none, + m->muxnames[1] ? m->muxnames[1] : none, + m->muxnames[2] ? m->muxnames[2] : none, + m->muxnames[3] ? m->muxnames[3] : none, + m->muxnames[4] ? m->muxnames[4] : none, + m->muxnames[5] ? m->muxnames[5] : none, + m->muxnames[6] ? m->muxnames[6] : none, + m->muxnames[7] ? m->muxnames[7] : none); + + return 0; +} + +#define OMAP_MUX_MAX_ARG_CHAR 7 + +static ssize_t omap_mux_dbg_signal_write(struct file *file, + const char __user *user_buf, + size_t count, loff_t *ppos) +{ + char buf[OMAP_MUX_MAX_ARG_CHAR]; + struct seq_file *seqf; + struct omap_mux *m; + unsigned long val; + int buf_size, ret; + + if (count > OMAP_MUX_MAX_ARG_CHAR) + return -EINVAL; + + memset(buf, 0, sizeof(buf)); + buf_size = min(count, sizeof(buf) - 1); + + if (copy_from_user(buf, user_buf, buf_size)) + return -EFAULT; + + ret = strict_strtoul(buf, 0x10, &val); + if (ret < 0) + return ret; + + if (val > 0xffff) + return -EINVAL; + + seqf = file->private_data; + m = seqf->private; + + omap_mux_write((u16)val, m->reg_offset); + *ppos += count; + + return count; +} + +static int omap_mux_dbg_signal_open(struct inode *inode, struct file *file) +{ + return single_open(file, omap_mux_dbg_signal_show, inode->i_private); +} + +static const struct file_operations omap_mux_dbg_signal_fops = { + .open = omap_mux_dbg_signal_open, + .read = seq_read, + .write = omap_mux_dbg_signal_write, + .llseek = seq_lseek, + .release = single_release, +}; + +static struct dentry *mux_dbg_dir; + +static void __init omap_mux_dbg_init(void) +{ + struct omap_mux_entry *e; + + mux_dbg_dir = debugfs_create_dir("omap_mux", NULL); + if (!mux_dbg_dir) + return; + + (void)debugfs_create_file("board", S_IRUGO, mux_dbg_dir, + NULL, &omap_mux_dbg_board_fops); + + list_for_each_entry(e, &muxmodes, node) { + struct omap_mux *m = &e->mux; + + (void)debugfs_create_file(m->muxnames[0], S_IWUGO, mux_dbg_dir, + m, &omap_mux_dbg_signal_fops); + } +} + +#else +static inline void omap_mux_dbg_init(void) +{ +} +#endif /* CONFIG_DEBUG_FS */ + static void __init omap_mux_free_names(struct omap_mux *m) { int i; @@ -843,6 +1067,8 @@ static int __init omap_mux_late_init(void) } + omap_mux_dbg_init(); + return 0; } late_initcall(omap_mux_late_init); @@ -1107,6 +1333,7 @@ int __init omap_mux_init(u32 mux_pbase, u32 mux_size, if (mux_base) return -EBUSY; + mux_phys = mux_pbase; mux_base = ioremap(mux_pbase, mux_size); if (!mux_base) { printk(KERN_ERR "mux: Could not ioremap\n"); |