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/*
* arch/blackfin/kernel/cplbinfo.c - display CPLB status
*
* Copyright 2004-2008 Analog Devices Inc.
* Licensed under the GPL-2 or later.
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/proc_fs.h>
#include <linux/uaccess.h>
#include <asm/cplbinit.h>
#include <asm/blackfin.h>
typedef enum { ICPLB, DCPLB } cplb_type;
static char page_strtbl[][3] = { "1K", "4K", "1M", "4M" };
#define page(flags) (((flags) & 0x30000) >> 16)
#define strpage(flags) page_strtbl[page(flags)]
#ifdef CONFIG_MPU
static char *cplb_print_entry(char *buf, cplb_type type, unsigned int cpu)
{
struct cplb_entry *tbl;
int switched;
int i;
if (type == ICPLB) {
tbl = icplb_tbl[cpu];
switched = first_switched_icplb;
} else {
tbl = dcplb_tbl[cpu];
switched = first_switched_dcplb;
}
buf += sprintf(buf, "Index\tAddress\t\tData\tSize\tU/RD\tU/WR\tS/WR\tSwitch\n");
for (i = 0; i < MAX_CPLBS; ++i) {
unsigned long data = tbl[i].data;
unsigned long addr = tbl[i].addr;
if (!(data & CPLB_VALID))
continue;
buf += sprintf(buf,
"%d\t0x%08lx\t%05lx\t%s\t%c\t%c\t%c\t%c\n",
i, addr, data, strpage(data),
(data & CPLB_USER_RD) ? 'Y' : 'N',
(data & CPLB_USER_WR) ? 'Y' : 'N',
(data & CPLB_SUPV_WR) ? 'Y' : 'N',
i < switched ? 'N' : 'Y');
}
buf += sprintf(buf, "\n");
return buf;
}
#else
extern int page_size_table[];
static int cplb_find_entry(unsigned long *cplb_addr,
unsigned long *cplb_data, unsigned long addr,
unsigned long data)
{
int i;
for (i = 0; i < 16; ++i)
if (addr >= cplb_addr[i] &&
addr < cplb_addr[i] + page_size_table[page(cplb_data[i])] &&
cplb_data[i] == data)
return i;
return -1;
}
static char *cplb_print_entry(char *buf, cplb_type type, unsigned int cpu)
{
unsigned long *p_addr, *p_data, *p_icount, *p_ocount;
unsigned long *cplb_addr, *cplb_data;
int entry = 0, used_cplb = 0;
if (type == ICPLB) {
p_addr = ipdt_tables[cpu];
p_data = ipdt_tables[cpu] + 1;
p_icount = ipdt_swapcount_tables[cpu];
p_ocount = ipdt_swapcount_tables[cpu] + 1;
cplb_addr = (unsigned long *)ICPLB_ADDR0;
cplb_data = (unsigned long *)ICPLB_DATA0;
} else {
p_addr = dpdt_tables[cpu];
p_data = dpdt_tables[cpu] + 1;
p_icount = dpdt_swapcount_tables[cpu];
p_ocount = dpdt_swapcount_tables[cpu] + 1;
cplb_addr = (unsigned long *)DCPLB_ADDR0;
cplb_data = (unsigned long *)DCPLB_DATA0;
}
buf += sprintf(buf, "Address\t\tData\tSize\tValid\tLocked\tSwapin\tiCount\toCount\n");
while (*p_addr != 0xffffffff) {
entry = cplb_find_entry(cplb_addr, cplb_data, *p_addr, *p_data);
if (entry >= 0)
used_cplb |= 1 << entry;
buf += sprintf(buf,
"0x%08lx\t0x%05lx\t%s\t%c\t%c\t%2d\t%ld\t%ld\n",
*p_addr, *p_data, strpage(*p_data),
(*p_data & CPLB_VALID) ? 'Y' : 'N',
(*p_data & CPLB_LOCK) ? 'Y' : 'N', entry, *p_icount,
*p_ocount);
p_addr += 2;
p_data += 2;
p_icount += 2;
p_ocount += 2;
}
if (used_cplb != 0xffff) {
buf += sprintf(buf, "Unused/mismatched CPLBs:\n");
for (entry = 0; entry < 16; ++entry)
if (0 == ((1 << entry) & used_cplb)) {
int flags = cplb_data[entry];
buf += sprintf(buf,
"%2d: 0x%08lx\t0x%05x\t%s\t%c\t%c\n",
entry, cplb_addr[entry], flags, strpage(flags),
(flags & CPLB_VALID) ? 'Y' : 'N',
(flags & CPLB_LOCK) ? 'Y' : 'N');
}
}
buf += sprintf(buf, "\n");
return buf;
}
#endif
static int cplbinfo_proc_output(char *buf, void *data)
{
unsigned int cpu = (unsigned int)data;
char *p = buf;
if (bfin_read_IMEM_CONTROL() & ENICPLB) {
p += sprintf(p, "Instruction CPLB entry:\n");
p = cplb_print_entry(p, ICPLB, cpu);
} else
p += sprintf(p, "Instruction CPLB is disabled.\n\n");
if (bfin_read_DMEM_CONTROL() & ENDCPLB) {
p += sprintf(p, "Data CPLB entry:\n");
p = cplb_print_entry(p, DCPLB, cpu);
} else
p += sprintf(p, "Data CPLB is disabled.\n\n");
return p - buf;
}
static int cplbinfo_read_proc(char *page, char **start, off_t off,
int count, int *eof, void *data)
{
int len = cplbinfo_proc_output(page, data);
if (len <= off + count)
*eof = 1;
*start = page + off;
len -= off;
return max(min(len, count), 0);
}
static int __init cplbinfo_init(void)
{
struct proc_dir_entry *parent, *entry;
unsigned int cpu;
unsigned char str[10];
parent = proc_mkdir("cplbinfo", NULL);
if (!parent)
return -ENOMEM;
for_each_online_cpu(cpu) {
sprintf(str, "cpu%u", cpu);
entry = create_proc_entry(str, 0, parent);
if (!entry)
return -ENOMEM;
entry->read_proc = cplbinfo_read_proc;
entry->data = (void *)cpu;
}
return 0;
}
late_initcall(cplbinfo_init);
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