1 files changed, 200 insertions, 0 deletions

diff --git a/arch/blackfin/kernel/cplbinfo.c b/arch/blackfin/kernel/cplbinfo.c
new file mode 100644
index 000000000000..dc584fe18e5f
--- /dev/null
+++ b/arch/blackfin/kernel/cplbinfo.c
@@ -0,0 +1,200 @@
+/*
+ * 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
+
+static int page_size_table[4] = {
+        0x00000400,             /* 1K */
+        0x00001000,             /* 4K */
+        0x00100000,             /* 1M */
+        0x00400000              /* 4M */
+};
+
+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);