diff options
Diffstat (limited to 'arch/blackfin/kernel/cplbinfo.c')
| -rw-r--r-- | arch/blackfin/kernel/cplbinfo.c | 177 |
1 files changed, 177 insertions, 0 deletions
diff --git a/arch/blackfin/kernel/cplbinfo.c b/arch/blackfin/kernel/cplbinfo.c new file mode 100644 index 000000000000..64d78300dd08 --- /dev/null +++ b/arch/blackfin/kernel/cplbinfo.c @@ -0,0 +1,177 @@ +/* + * arch/blackfin/kernel/cplbinfo.c - display CPLB status + * + * Copyright 2004-2008 Analog Devices Inc. + * Licensed under the GPL-2 or later. + */ + +#include <linux/ctype.h> +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/proc_fs.h> +#include <linux/seq_file.h> +#include <linux/uaccess.h> + +#include <asm/cplbinit.h> +#include <asm/blackfin.h> + +static char const page_strtbl[][3] = { "1K", "4K", "1M", "4M" }; +#define page(flags) (((flags) & 0x30000) >> 16) +#define strpage(flags) page_strtbl[page(flags)] + +struct cplbinfo_data { + loff_t pos; + char cplb_type; + u32 mem_control; + struct cplb_entry *tbl; + int switched; +}; + +static void cplbinfo_print_header(struct seq_file *m) +{ + seq_printf(m, "Index\tAddress\t\tData\tSize\tU/RD\tU/WR\tS/WR\tSwitch\n"); +} + +static int cplbinfo_nomore(struct cplbinfo_data *cdata) +{ + return cdata->pos >= MAX_CPLBS; +} + +static int cplbinfo_show(struct seq_file *m, void *p) +{ + struct cplbinfo_data *cdata; + unsigned long data, addr; + loff_t pos; + + cdata = p; + pos = cdata->pos; + addr = cdata->tbl[pos].addr; + data = cdata->tbl[pos].data; + + seq_printf(m, + "%d\t0x%08lx\t%05lx\t%s\t%c\t%c\t%c\t%c\n", + (int)pos, addr, data, strpage(data), + (data & CPLB_USER_RD) ? 'Y' : 'N', + (data & CPLB_USER_WR) ? 'Y' : 'N', + (data & CPLB_SUPV_WR) ? 'Y' : 'N', + pos < cdata->switched ? 'N' : 'Y'); + + return 0; +} + +static void cplbinfo_seq_init(struct cplbinfo_data *cdata, unsigned int cpu) +{ + if (cdata->cplb_type == 'I') { + cdata->mem_control = bfin_read_IMEM_CONTROL(); + cdata->tbl = icplb_tbl[cpu]; + cdata->switched = first_switched_icplb; + } else { + cdata->mem_control = bfin_read_DMEM_CONTROL(); + cdata->tbl = dcplb_tbl[cpu]; + cdata->switched = first_switched_dcplb; + } +} + +static void *cplbinfo_start(struct seq_file *m, loff_t *pos) +{ + struct cplbinfo_data *cdata = m->private; + + if (!*pos) { + seq_printf(m, "%cCPLBs are %sabled: 0x%x\n", cdata->cplb_type, + (cdata->mem_control & ENDCPLB ? "en" : "dis"), + cdata->mem_control); + cplbinfo_print_header(m); + } else if (cplbinfo_nomore(cdata)) + return NULL; + + get_cpu(); + return cdata; +} + +static void *cplbinfo_next(struct seq_file *m, void *p, loff_t *pos) +{ + struct cplbinfo_data *cdata = p; + cdata->pos = ++(*pos); + if (cplbinfo_nomore(cdata)) + return NULL; + else + return cdata; +} + +static void cplbinfo_stop(struct seq_file *m, void *p) +{ + put_cpu(); +} + +static const struct seq_operations cplbinfo_sops = { + .start = cplbinfo_start, + .next = cplbinfo_next, + .stop = cplbinfo_stop, + .show = cplbinfo_show, +}; + +static int cplbinfo_open(struct inode *inode, struct file *file) +{ + char buf[256], *path, *p; + unsigned int cpu; + char *s_cpu, *s_cplb; + int ret; + struct seq_file *m; + struct cplbinfo_data *cdata; + + path = d_path(&file->f_path, buf, sizeof(buf)); + if (IS_ERR(path)) + return PTR_ERR(path); + s_cpu = strstr(path, "/cpu"); + s_cplb = strrchr(path, '/'); + if (!s_cpu || !s_cplb) + return -EINVAL; + + cpu = simple_strtoul(s_cpu + 4, &p, 10); + if (!cpu_online(cpu)) + return -ENODEV; + + ret = seq_open_private(file, &cplbinfo_sops, sizeof(*cdata)); + if (ret) + return ret; + m = file->private_data; + cdata = m->private; + + cdata->pos = 0; + cdata->cplb_type = toupper(s_cplb[1]); + cplbinfo_seq_init(cdata, cpu); + + return 0; +} + +static const struct file_operations cplbinfo_fops = { + .open = cplbinfo_open, + .read = seq_read, + .llseek = seq_lseek, + .release = seq_release_private, +}; + +static int __init cplbinfo_init(void) +{ + struct proc_dir_entry *cplb_dir, *cpu_dir; + char buf[10]; + unsigned int cpu; + + cplb_dir = proc_mkdir("cplbinfo", NULL); + if (!cplb_dir) + return -ENOMEM; + + for_each_possible_cpu(cpu) { + sprintf(buf, "cpu%i", cpu); + cpu_dir = proc_mkdir(buf, cplb_dir); + if (!cpu_dir) + return -ENOMEM; + + proc_create("icplb", S_IRUGO, cpu_dir, &cplbinfo_fops); + proc_create("dcplb", S_IRUGO, cpu_dir, &cplbinfo_fops); + } + + return 0; +} +late_initcall(cplbinfo_init); |