1/* 2 * File: arch/blackfin/mach-common/cplbinfo.c 3 * Based on: 4 * Author: Sonic Zhang <sonic.zhang@analog.com> 5 * 6 * Created: Jan. 2005 7 * Description: Display CPLB status 8 * 9 * Modified: 10 * Copyright 2004-2006 Analog Devices Inc. 11 * 12 * Bugs: Enter bugs at http://blackfin.uclinux.org/ 13 * 14 * This program is free software; you can redistribute it and/or modify 15 * it under the terms of the GNU General Public License as published by 16 * the Free Software Foundation; either version 2 of the License, or 17 * (at your option) any later version. 18 * 19 * This program is distributed in the hope that it will be useful, 20 * but WITHOUT ANY WARRANTY; without even the implied warranty of 21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 22 * GNU General Public License for more details. 23 * 24 * You should have received a copy of the GNU General Public License 25 * along with this program; if not, see the file COPYING, or write 26 * to the Free Software Foundation, Inc., 27 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 28 */ 29 30#include <linux/module.h> 31#include <linux/kernel.h> 32#include <linux/init.h> 33#include <linux/proc_fs.h> 34 35#include <asm/current.h> 36#include <asm/uaccess.h> 37#include <asm/system.h> 38 39#include <asm/cplb.h> 40#include <asm/blackfin.h> 41 42#define CPLB_I 1 43#define CPLB_D 2 44 45#define SYNC_SYS SSYNC() 46#define SYNC_CORE CSYNC() 47 48#define CPLB_BIT_PAGESIZE 0x30000 49 50static int page_size_table[4] = { 51 0x00000400, /* 1K */ 52 0x00001000, /* 4K */ 53 0x00100000, /* 1M */ 54 0x00400000 /* 4M */ 55}; 56 57static char page_size_string_table[][4] = { "1K", "4K", "1M", "4M" }; 58 59static int cplb_find_entry(unsigned long *cplb_addr, 60 unsigned long *cplb_data, unsigned long addr, 61 unsigned long data) 62{ 63 int ii; 64 65 for (ii = 0; ii < 16; ii++) 66 if (addr >= cplb_addr[ii] && addr < cplb_addr[ii] + 67 page_size_table[(cplb_data[ii] & CPLB_BIT_PAGESIZE) >> 16] 68 && (cplb_data[ii] == data)) 69 return ii; 70 71 return -1; 72} 73 74static char *cplb_print_entry(char *buf, int type) 75{ 76 unsigned long *p_addr = dpdt_table; 77 unsigned long *p_data = dpdt_table + 1; 78 unsigned long *p_icount = dpdt_swapcount_table; 79 unsigned long *p_ocount = dpdt_swapcount_table + 1; 80 unsigned long *cplb_addr = (unsigned long *)DCPLB_ADDR0; 81 unsigned long *cplb_data = (unsigned long *)DCPLB_DATA0; 82 int entry = 0, used_cplb = 0; 83 84 if (type == CPLB_I) { 85 buf += sprintf(buf, "Instruction CPLB entry:\n"); 86 p_addr = ipdt_table; 87 p_data = ipdt_table + 1; 88 p_icount = ipdt_swapcount_table; 89 p_ocount = ipdt_swapcount_table + 1; 90 cplb_addr = (unsigned long *)ICPLB_ADDR0; 91 cplb_data = (unsigned long *)ICPLB_DATA0; 92 } else 93 buf += sprintf(buf, "Data CPLB entry:\n"); 94 95 buf += sprintf(buf, "Address\t\tData\tSize\tValid\tLocked\tSwapin\ 96\tiCount\toCount\n"); 97 98 while (*p_addr != 0xffffffff) { 99 entry = cplb_find_entry(cplb_addr, cplb_data, *p_addr, *p_data); 100 if (entry >= 0) 101 used_cplb |= 1 << entry; 102 103 buf += 104 sprintf(buf, 105 "0x%08lx\t0x%05lx\t%s\t%c\t%c\t%2d\t%ld\t%ld\n", 106 *p_addr, *p_data, 107 page_size_string_table[(*p_data & 0x30000) >> 16], 108 (*p_data & CPLB_VALID) ? 'Y' : 'N', 109 (*p_data & CPLB_LOCK) ? 'Y' : 'N', entry, *p_icount, 110 *p_ocount); 111 112 p_addr += 2; 113 p_data += 2; 114 p_icount += 2; 115 p_ocount += 2; 116 } 117 118 if (used_cplb != 0xffff) { 119 buf += sprintf(buf, "Unused/mismatched CPLBs:\n"); 120 121 for (entry = 0; entry < 16; entry++) 122 if (0 == ((1 << entry) & used_cplb)) { 123 int flags = cplb_data[entry]; 124 buf += 125 sprintf(buf, 126 "%2d: 0x%08lx\t0x%05x\t%s\t%c\t%c\n", 127 entry, cplb_addr[entry], flags, 128 page_size_string_table[(flags & 129 0x30000) >> 130 16], 131 (flags & CPLB_VALID) ? 'Y' : 'N', 132 (flags & CPLB_LOCK) ? 'Y' : 'N'); 133 } 134 } 135 136 buf += sprintf(buf, "\n"); 137 138 return buf; 139} 140 141static int cplbinfo_proc_output(char *buf) 142{ 143 char *p; 144 145 p = buf; 146 147 p += sprintf(p, 148 "------------------ CPLB Information ------------------\n\n"); 149 150 if (bfin_read_IMEM_CONTROL() & ENICPLB) 151 p = cplb_print_entry(p, CPLB_I); 152 else 153 p += sprintf(p, "Instruction CPLB is disabled.\n\n"); 154 155 if (bfin_read_DMEM_CONTROL() & ENDCPLB) 156 p = cplb_print_entry(p, CPLB_D); 157 else 158 p += sprintf(p, "Data CPLB is disabled.\n"); 159 160 return p - buf; 161} 162 163static int cplbinfo_read_proc(char *page, char **start, off_t off, 164 int count, int *eof, void *data) 165{ 166 int len; 167 168 len = cplbinfo_proc_output(page); 169 if (len <= off + count) 170 *eof = 1; 171 *start = page + off; 172 len -= off; 173 if (len > count) 174 len = count; 175 if (len < 0) 176 len = 0; 177 return len; 178} 179 180static int cplbinfo_write_proc(struct file *file, const char __user *buffer, 181 unsigned long count, void *data) 182{ 183 printk(KERN_INFO "Reset the CPLB swap in/out counts.\n"); 184 memset(ipdt_swapcount_table, 0, MAX_SWITCH_I_CPLBS * sizeof(unsigned long)); 185 memset(dpdt_swapcount_table, 0, MAX_SWITCH_D_CPLBS * sizeof(unsigned long)); 186 187 return count; 188} 189 190static int __init cplbinfo_init(void) 191{ 192 struct proc_dir_entry *entry; 193 194 if ((entry = create_proc_entry("cplbinfo", 0, NULL)) == NULL) { 195 return -ENOMEM; 196 } 197 198 entry->read_proc = cplbinfo_read_proc; 199 entry->write_proc = cplbinfo_write_proc; 200 entry->data = NULL; 201 202 return 0; 203} 204 205static void __exit cplbinfo_exit(void) 206{ 207 remove_proc_entry("cplbinfo", NULL); 208} 209 210module_init(cplbinfo_init); 211module_exit(cplbinfo_exit); 212