178 lines
3.8 KiB
C
178 lines
3.8 KiB
C
/*
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* arch/blackfin/kernel/cplbinfo.c - display CPLB status
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*
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* Copyright 2004-2008 Analog Devices Inc.
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*
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* Licensed under the GPL-2 or later.
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*/
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#include <linux/ctype.h>
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/proc_fs.h>
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#include <linux/seq_file.h>
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#include <linux/uaccess.h>
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#include <asm/cplbinit.h>
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#include <asm/blackfin.h>
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static char const page_strtbl[][3] = { "1K", "4K", "1M", "4M" };
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#define page(flags) (((flags) & 0x30000) >> 16)
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#define strpage(flags) page_strtbl[page(flags)]
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struct cplbinfo_data {
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loff_t pos;
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char cplb_type;
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u32 mem_control;
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struct cplb_entry *tbl;
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int switched;
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};
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static void cplbinfo_print_header(struct seq_file *m)
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{
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seq_printf(m, "Index\tAddress\t\tData\tSize\tU/RD\tU/WR\tS/WR\tSwitch\n");
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}
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static int cplbinfo_nomore(struct cplbinfo_data *cdata)
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{
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return cdata->pos >= MAX_CPLBS;
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}
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static int cplbinfo_show(struct seq_file *m, void *p)
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{
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struct cplbinfo_data *cdata;
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unsigned long data, addr;
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loff_t pos;
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cdata = p;
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pos = cdata->pos;
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addr = cdata->tbl[pos].addr;
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data = cdata->tbl[pos].data;
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seq_printf(m,
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"%d\t0x%08lx\t%05lx\t%s\t%c\t%c\t%c\t%c\n",
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(int)pos, addr, data, strpage(data),
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(data & CPLB_USER_RD) ? 'Y' : 'N',
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(data & CPLB_USER_WR) ? 'Y' : 'N',
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(data & CPLB_SUPV_WR) ? 'Y' : 'N',
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pos < cdata->switched ? 'N' : 'Y');
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return 0;
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}
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static void cplbinfo_seq_init(struct cplbinfo_data *cdata, unsigned int cpu)
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{
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if (cdata->cplb_type == 'I') {
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cdata->mem_control = bfin_read_IMEM_CONTROL();
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cdata->tbl = icplb_tbl[cpu];
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cdata->switched = first_switched_icplb;
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} else {
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cdata->mem_control = bfin_read_DMEM_CONTROL();
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cdata->tbl = dcplb_tbl[cpu];
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cdata->switched = first_switched_dcplb;
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}
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}
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static void *cplbinfo_start(struct seq_file *m, loff_t *pos)
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{
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struct cplbinfo_data *cdata = m->private;
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if (!*pos) {
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seq_printf(m, "%cCPLBs are %sabled: 0x%x\n", cdata->cplb_type,
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(cdata->mem_control & ENDCPLB ? "en" : "dis"),
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cdata->mem_control);
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cplbinfo_print_header(m);
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} else if (cplbinfo_nomore(cdata))
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return NULL;
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get_cpu();
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return cdata;
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}
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static void *cplbinfo_next(struct seq_file *m, void *p, loff_t *pos)
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{
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struct cplbinfo_data *cdata = p;
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cdata->pos = ++(*pos);
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if (cplbinfo_nomore(cdata))
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return NULL;
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else
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return cdata;
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}
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static void cplbinfo_stop(struct seq_file *m, void *p)
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{
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put_cpu();
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}
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static const struct seq_operations cplbinfo_sops = {
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.start = cplbinfo_start,
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.next = cplbinfo_next,
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.stop = cplbinfo_stop,
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.show = cplbinfo_show,
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};
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#define CPLBINFO_DCPLB_FLAG 0x80000000
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static int cplbinfo_open(struct inode *inode, struct file *file)
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{
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struct proc_dir_entry *pde = PDE(file->f_path.dentry->d_inode);
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char cplb_type;
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unsigned int cpu;
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int ret;
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struct seq_file *m;
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struct cplbinfo_data *cdata;
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cpu = (unsigned int)pde->data;
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cplb_type = cpu & CPLBINFO_DCPLB_FLAG ? 'D' : 'I';
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cpu &= ~CPLBINFO_DCPLB_FLAG;
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if (!cpu_online(cpu))
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return -ENODEV;
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ret = seq_open_private(file, &cplbinfo_sops, sizeof(*cdata));
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if (ret)
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return ret;
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m = file->private_data;
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cdata = m->private;
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cdata->pos = 0;
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cdata->cplb_type = cplb_type;
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cplbinfo_seq_init(cdata, cpu);
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return 0;
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}
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static const struct file_operations cplbinfo_fops = {
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.open = cplbinfo_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = seq_release_private,
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};
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static int __init cplbinfo_init(void)
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{
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struct proc_dir_entry *cplb_dir, *cpu_dir;
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char buf[10];
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unsigned int cpu;
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cplb_dir = proc_mkdir("cplbinfo", NULL);
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if (!cplb_dir)
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return -ENOMEM;
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for_each_possible_cpu(cpu) {
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sprintf(buf, "cpu%i", cpu);
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cpu_dir = proc_mkdir(buf, cplb_dir);
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if (!cpu_dir)
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return -ENOMEM;
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proc_create_data("icplb", S_IRUGO, cpu_dir, &cplbinfo_fops,
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(void *)cpu);
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proc_create_data("dcplb", S_IRUGO, cpu_dir, &cplbinfo_fops,
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(void *)(cpu | CPLBINFO_DCPLB_FLAG));
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}
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return 0;
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}
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late_initcall(cplbinfo_init);
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