13fafe9c2SBenjamin Herrenschmidt /* 23fafe9c2SBenjamin Herrenschmidt * PowerNV LPC bus handling. 33fafe9c2SBenjamin Herrenschmidt * 43fafe9c2SBenjamin Herrenschmidt * Copyright 2013 IBM Corp. 53fafe9c2SBenjamin Herrenschmidt * 63fafe9c2SBenjamin Herrenschmidt * This program is free software; you can redistribute it and/or 73fafe9c2SBenjamin Herrenschmidt * modify it under the terms of the GNU General Public License 83fafe9c2SBenjamin Herrenschmidt * as published by the Free Software Foundation; either version 93fafe9c2SBenjamin Herrenschmidt * 2 of the License, or (at your option) any later version. 103fafe9c2SBenjamin Herrenschmidt */ 113fafe9c2SBenjamin Herrenschmidt 123fafe9c2SBenjamin Herrenschmidt #include <linux/kernel.h> 133fafe9c2SBenjamin Herrenschmidt #include <linux/of.h> 143fafe9c2SBenjamin Herrenschmidt #include <linux/bug.h> 15fa2dbe2eSBenjamin Herrenschmidt #include <linux/debugfs.h> 16fa2dbe2eSBenjamin Herrenschmidt #include <linux/io.h> 17fa2dbe2eSBenjamin Herrenschmidt #include <linux/slab.h> 183fafe9c2SBenjamin Herrenschmidt 193fafe9c2SBenjamin Herrenschmidt #include <asm/machdep.h> 203fafe9c2SBenjamin Herrenschmidt #include <asm/firmware.h> 213fafe9c2SBenjamin Herrenschmidt #include <asm/xics.h> 223fafe9c2SBenjamin Herrenschmidt #include <asm/opal.h> 2326a2056eSRob Herring #include <asm/prom.h> 24fa2dbe2eSBenjamin Herrenschmidt #include <asm/uaccess.h> 253fafe9c2SBenjamin Herrenschmidt 263fafe9c2SBenjamin Herrenschmidt static int opal_lpc_chip_id = -1; 273fafe9c2SBenjamin Herrenschmidt 283fafe9c2SBenjamin Herrenschmidt static u8 opal_lpc_inb(unsigned long port) 293fafe9c2SBenjamin Herrenschmidt { 303fafe9c2SBenjamin Herrenschmidt int64_t rc; 31803c2d2fSBenjamin Herrenschmidt __be32 data; 323fafe9c2SBenjamin Herrenschmidt 333fafe9c2SBenjamin Herrenschmidt if (opal_lpc_chip_id < 0 || port > 0xffff) 343fafe9c2SBenjamin Herrenschmidt return 0xff; 353fafe9c2SBenjamin Herrenschmidt rc = opal_lpc_read(opal_lpc_chip_id, OPAL_LPC_IO, port, &data, 1); 36803c2d2fSBenjamin Herrenschmidt return rc ? 0xff : be32_to_cpu(data); 373fafe9c2SBenjamin Herrenschmidt } 383fafe9c2SBenjamin Herrenschmidt 393fafe9c2SBenjamin Herrenschmidt static __le16 __opal_lpc_inw(unsigned long port) 403fafe9c2SBenjamin Herrenschmidt { 413fafe9c2SBenjamin Herrenschmidt int64_t rc; 42803c2d2fSBenjamin Herrenschmidt __be32 data; 433fafe9c2SBenjamin Herrenschmidt 443fafe9c2SBenjamin Herrenschmidt if (opal_lpc_chip_id < 0 || port > 0xfffe) 453fafe9c2SBenjamin Herrenschmidt return 0xffff; 463fafe9c2SBenjamin Herrenschmidt if (port & 1) 473fafe9c2SBenjamin Herrenschmidt return (__le16)opal_lpc_inb(port) << 8 | opal_lpc_inb(port + 1); 483fafe9c2SBenjamin Herrenschmidt rc = opal_lpc_read(opal_lpc_chip_id, OPAL_LPC_IO, port, &data, 2); 49803c2d2fSBenjamin Herrenschmidt return rc ? 0xffff : be32_to_cpu(data); 503fafe9c2SBenjamin Herrenschmidt } 513fafe9c2SBenjamin Herrenschmidt static u16 opal_lpc_inw(unsigned long port) 523fafe9c2SBenjamin Herrenschmidt { 533fafe9c2SBenjamin Herrenschmidt return le16_to_cpu(__opal_lpc_inw(port)); 543fafe9c2SBenjamin Herrenschmidt } 553fafe9c2SBenjamin Herrenschmidt 563fafe9c2SBenjamin Herrenschmidt static __le32 __opal_lpc_inl(unsigned long port) 573fafe9c2SBenjamin Herrenschmidt { 583fafe9c2SBenjamin Herrenschmidt int64_t rc; 59803c2d2fSBenjamin Herrenschmidt __be32 data; 603fafe9c2SBenjamin Herrenschmidt 613fafe9c2SBenjamin Herrenschmidt if (opal_lpc_chip_id < 0 || port > 0xfffc) 623fafe9c2SBenjamin Herrenschmidt return 0xffffffff; 633fafe9c2SBenjamin Herrenschmidt if (port & 3) 643fafe9c2SBenjamin Herrenschmidt return (__le32)opal_lpc_inb(port ) << 24 | 653fafe9c2SBenjamin Herrenschmidt (__le32)opal_lpc_inb(port + 1) << 16 | 663fafe9c2SBenjamin Herrenschmidt (__le32)opal_lpc_inb(port + 2) << 8 | 673fafe9c2SBenjamin Herrenschmidt opal_lpc_inb(port + 3); 683fafe9c2SBenjamin Herrenschmidt rc = opal_lpc_read(opal_lpc_chip_id, OPAL_LPC_IO, port, &data, 4); 69803c2d2fSBenjamin Herrenschmidt return rc ? 0xffffffff : be32_to_cpu(data); 703fafe9c2SBenjamin Herrenschmidt } 713fafe9c2SBenjamin Herrenschmidt 723fafe9c2SBenjamin Herrenschmidt static u32 opal_lpc_inl(unsigned long port) 733fafe9c2SBenjamin Herrenschmidt { 743fafe9c2SBenjamin Herrenschmidt return le32_to_cpu(__opal_lpc_inl(port)); 753fafe9c2SBenjamin Herrenschmidt } 763fafe9c2SBenjamin Herrenschmidt 773fafe9c2SBenjamin Herrenschmidt static void opal_lpc_outb(u8 val, unsigned long port) 783fafe9c2SBenjamin Herrenschmidt { 793fafe9c2SBenjamin Herrenschmidt if (opal_lpc_chip_id < 0 || port > 0xffff) 803fafe9c2SBenjamin Herrenschmidt return; 813fafe9c2SBenjamin Herrenschmidt opal_lpc_write(opal_lpc_chip_id, OPAL_LPC_IO, port, val, 1); 823fafe9c2SBenjamin Herrenschmidt } 833fafe9c2SBenjamin Herrenschmidt 843fafe9c2SBenjamin Herrenschmidt static void __opal_lpc_outw(__le16 val, unsigned long port) 853fafe9c2SBenjamin Herrenschmidt { 863fafe9c2SBenjamin Herrenschmidt if (opal_lpc_chip_id < 0 || port > 0xfffe) 873fafe9c2SBenjamin Herrenschmidt return; 883fafe9c2SBenjamin Herrenschmidt if (port & 1) { 893fafe9c2SBenjamin Herrenschmidt opal_lpc_outb(val >> 8, port); 903fafe9c2SBenjamin Herrenschmidt opal_lpc_outb(val , port + 1); 913fafe9c2SBenjamin Herrenschmidt return; 923fafe9c2SBenjamin Herrenschmidt } 933fafe9c2SBenjamin Herrenschmidt opal_lpc_write(opal_lpc_chip_id, OPAL_LPC_IO, port, val, 2); 943fafe9c2SBenjamin Herrenschmidt } 953fafe9c2SBenjamin Herrenschmidt 963fafe9c2SBenjamin Herrenschmidt static void opal_lpc_outw(u16 val, unsigned long port) 973fafe9c2SBenjamin Herrenschmidt { 983fafe9c2SBenjamin Herrenschmidt __opal_lpc_outw(cpu_to_le16(val), port); 993fafe9c2SBenjamin Herrenschmidt } 1003fafe9c2SBenjamin Herrenschmidt 1013fafe9c2SBenjamin Herrenschmidt static void __opal_lpc_outl(__le32 val, unsigned long port) 1023fafe9c2SBenjamin Herrenschmidt { 1033fafe9c2SBenjamin Herrenschmidt if (opal_lpc_chip_id < 0 || port > 0xfffc) 1043fafe9c2SBenjamin Herrenschmidt return; 1053fafe9c2SBenjamin Herrenschmidt if (port & 3) { 1063fafe9c2SBenjamin Herrenschmidt opal_lpc_outb(val >> 24, port); 1073fafe9c2SBenjamin Herrenschmidt opal_lpc_outb(val >> 16, port + 1); 1083fafe9c2SBenjamin Herrenschmidt opal_lpc_outb(val >> 8, port + 2); 1093fafe9c2SBenjamin Herrenschmidt opal_lpc_outb(val , port + 3); 1103fafe9c2SBenjamin Herrenschmidt return; 1113fafe9c2SBenjamin Herrenschmidt } 1123fafe9c2SBenjamin Herrenschmidt opal_lpc_write(opal_lpc_chip_id, OPAL_LPC_IO, port, val, 4); 1133fafe9c2SBenjamin Herrenschmidt } 1143fafe9c2SBenjamin Herrenschmidt 1153fafe9c2SBenjamin Herrenschmidt static void opal_lpc_outl(u32 val, unsigned long port) 1163fafe9c2SBenjamin Herrenschmidt { 1173fafe9c2SBenjamin Herrenschmidt __opal_lpc_outl(cpu_to_le32(val), port); 1183fafe9c2SBenjamin Herrenschmidt } 1193fafe9c2SBenjamin Herrenschmidt 1203fafe9c2SBenjamin Herrenschmidt static void opal_lpc_insb(unsigned long p, void *b, unsigned long c) 1213fafe9c2SBenjamin Herrenschmidt { 1223fafe9c2SBenjamin Herrenschmidt u8 *ptr = b; 1233fafe9c2SBenjamin Herrenschmidt 1243fafe9c2SBenjamin Herrenschmidt while(c--) 1253fafe9c2SBenjamin Herrenschmidt *(ptr++) = opal_lpc_inb(p); 1263fafe9c2SBenjamin Herrenschmidt } 1273fafe9c2SBenjamin Herrenschmidt 1283fafe9c2SBenjamin Herrenschmidt static void opal_lpc_insw(unsigned long p, void *b, unsigned long c) 1293fafe9c2SBenjamin Herrenschmidt { 1303fafe9c2SBenjamin Herrenschmidt __le16 *ptr = b; 1313fafe9c2SBenjamin Herrenschmidt 1323fafe9c2SBenjamin Herrenschmidt while(c--) 1333fafe9c2SBenjamin Herrenschmidt *(ptr++) = __opal_lpc_inw(p); 1343fafe9c2SBenjamin Herrenschmidt } 1353fafe9c2SBenjamin Herrenschmidt 1363fafe9c2SBenjamin Herrenschmidt static void opal_lpc_insl(unsigned long p, void *b, unsigned long c) 1373fafe9c2SBenjamin Herrenschmidt { 1383fafe9c2SBenjamin Herrenschmidt __le32 *ptr = b; 1393fafe9c2SBenjamin Herrenschmidt 1403fafe9c2SBenjamin Herrenschmidt while(c--) 1413fafe9c2SBenjamin Herrenschmidt *(ptr++) = __opal_lpc_inl(p); 1423fafe9c2SBenjamin Herrenschmidt } 1433fafe9c2SBenjamin Herrenschmidt 1443fafe9c2SBenjamin Herrenschmidt static void opal_lpc_outsb(unsigned long p, const void *b, unsigned long c) 1453fafe9c2SBenjamin Herrenschmidt { 1463fafe9c2SBenjamin Herrenschmidt const u8 *ptr = b; 1473fafe9c2SBenjamin Herrenschmidt 1483fafe9c2SBenjamin Herrenschmidt while(c--) 1493fafe9c2SBenjamin Herrenschmidt opal_lpc_outb(*(ptr++), p); 1503fafe9c2SBenjamin Herrenschmidt } 1513fafe9c2SBenjamin Herrenschmidt 1523fafe9c2SBenjamin Herrenschmidt static void opal_lpc_outsw(unsigned long p, const void *b, unsigned long c) 1533fafe9c2SBenjamin Herrenschmidt { 1543fafe9c2SBenjamin Herrenschmidt const __le16 *ptr = b; 1553fafe9c2SBenjamin Herrenschmidt 1563fafe9c2SBenjamin Herrenschmidt while(c--) 1573fafe9c2SBenjamin Herrenschmidt __opal_lpc_outw(*(ptr++), p); 1583fafe9c2SBenjamin Herrenschmidt } 1593fafe9c2SBenjamin Herrenschmidt 1603fafe9c2SBenjamin Herrenschmidt static void opal_lpc_outsl(unsigned long p, const void *b, unsigned long c) 1613fafe9c2SBenjamin Herrenschmidt { 1623fafe9c2SBenjamin Herrenschmidt const __le32 *ptr = b; 1633fafe9c2SBenjamin Herrenschmidt 1643fafe9c2SBenjamin Herrenschmidt while(c--) 1653fafe9c2SBenjamin Herrenschmidt __opal_lpc_outl(*(ptr++), p); 1663fafe9c2SBenjamin Herrenschmidt } 1673fafe9c2SBenjamin Herrenschmidt 1683fafe9c2SBenjamin Herrenschmidt static const struct ppc_pci_io opal_lpc_io = { 1693fafe9c2SBenjamin Herrenschmidt .inb = opal_lpc_inb, 1703fafe9c2SBenjamin Herrenschmidt .inw = opal_lpc_inw, 1713fafe9c2SBenjamin Herrenschmidt .inl = opal_lpc_inl, 1723fafe9c2SBenjamin Herrenschmidt .outb = opal_lpc_outb, 1733fafe9c2SBenjamin Herrenschmidt .outw = opal_lpc_outw, 1743fafe9c2SBenjamin Herrenschmidt .outl = opal_lpc_outl, 1753fafe9c2SBenjamin Herrenschmidt .insb = opal_lpc_insb, 1763fafe9c2SBenjamin Herrenschmidt .insw = opal_lpc_insw, 1773fafe9c2SBenjamin Herrenschmidt .insl = opal_lpc_insl, 1783fafe9c2SBenjamin Herrenschmidt .outsb = opal_lpc_outsb, 1793fafe9c2SBenjamin Herrenschmidt .outsw = opal_lpc_outsw, 1803fafe9c2SBenjamin Herrenschmidt .outsl = opal_lpc_outsl, 1813fafe9c2SBenjamin Herrenschmidt }; 1823fafe9c2SBenjamin Herrenschmidt 183fa2dbe2eSBenjamin Herrenschmidt #ifdef CONFIG_DEBUG_FS 184fa2dbe2eSBenjamin Herrenschmidt struct lpc_debugfs_entry { 185fa2dbe2eSBenjamin Herrenschmidt enum OpalLPCAddressType lpc_type; 186fa2dbe2eSBenjamin Herrenschmidt }; 187fa2dbe2eSBenjamin Herrenschmidt 188fa2dbe2eSBenjamin Herrenschmidt static ssize_t lpc_debug_read(struct file *filp, char __user *ubuf, 189fa2dbe2eSBenjamin Herrenschmidt size_t count, loff_t *ppos) 190fa2dbe2eSBenjamin Herrenschmidt { 191fa2dbe2eSBenjamin Herrenschmidt struct lpc_debugfs_entry *lpc = filp->private_data; 192fa2dbe2eSBenjamin Herrenschmidt u32 data, pos, len, todo; 193fa2dbe2eSBenjamin Herrenschmidt int rc; 194fa2dbe2eSBenjamin Herrenschmidt 195fa2dbe2eSBenjamin Herrenschmidt if (!access_ok(VERIFY_WRITE, ubuf, count)) 196fa2dbe2eSBenjamin Herrenschmidt return -EFAULT; 197fa2dbe2eSBenjamin Herrenschmidt 198fa2dbe2eSBenjamin Herrenschmidt todo = count; 199fa2dbe2eSBenjamin Herrenschmidt while (todo) { 200fa2dbe2eSBenjamin Herrenschmidt pos = *ppos; 201fa2dbe2eSBenjamin Herrenschmidt 202fa2dbe2eSBenjamin Herrenschmidt /* 203fa2dbe2eSBenjamin Herrenschmidt * Select access size based on count and alignment and 204fa2dbe2eSBenjamin Herrenschmidt * access type. IO and MEM only support byte acceses, 205fa2dbe2eSBenjamin Herrenschmidt * FW supports all 3. 206fa2dbe2eSBenjamin Herrenschmidt */ 207fa2dbe2eSBenjamin Herrenschmidt len = 1; 208fa2dbe2eSBenjamin Herrenschmidt if (lpc->lpc_type == OPAL_LPC_FW) { 209fa2dbe2eSBenjamin Herrenschmidt if (todo > 3 && (pos & 3) == 0) 210fa2dbe2eSBenjamin Herrenschmidt len = 4; 211fa2dbe2eSBenjamin Herrenschmidt else if (todo > 1 && (pos & 1) == 0) 212fa2dbe2eSBenjamin Herrenschmidt len = 2; 213fa2dbe2eSBenjamin Herrenschmidt } 214fa2dbe2eSBenjamin Herrenschmidt rc = opal_lpc_read(opal_lpc_chip_id, lpc->lpc_type, pos, 215fa2dbe2eSBenjamin Herrenschmidt &data, len); 216fa2dbe2eSBenjamin Herrenschmidt if (rc) 217fa2dbe2eSBenjamin Herrenschmidt return -ENXIO; 218fa2dbe2eSBenjamin Herrenschmidt switch(len) { 219fa2dbe2eSBenjamin Herrenschmidt case 4: 220fa2dbe2eSBenjamin Herrenschmidt rc = __put_user((u32)data, (u32 __user *)ubuf); 221fa2dbe2eSBenjamin Herrenschmidt break; 222fa2dbe2eSBenjamin Herrenschmidt case 2: 223fa2dbe2eSBenjamin Herrenschmidt rc = __put_user((u16)data, (u16 __user *)ubuf); 224fa2dbe2eSBenjamin Herrenschmidt break; 225fa2dbe2eSBenjamin Herrenschmidt default: 226fa2dbe2eSBenjamin Herrenschmidt rc = __put_user((u8)data, (u8 __user *)ubuf); 227fa2dbe2eSBenjamin Herrenschmidt break; 228fa2dbe2eSBenjamin Herrenschmidt } 229fa2dbe2eSBenjamin Herrenschmidt if (rc) 230fa2dbe2eSBenjamin Herrenschmidt return -EFAULT; 231fa2dbe2eSBenjamin Herrenschmidt *ppos += len; 232fa2dbe2eSBenjamin Herrenschmidt ubuf += len; 233fa2dbe2eSBenjamin Herrenschmidt todo -= len; 234fa2dbe2eSBenjamin Herrenschmidt } 235fa2dbe2eSBenjamin Herrenschmidt 236fa2dbe2eSBenjamin Herrenschmidt return count; 237fa2dbe2eSBenjamin Herrenschmidt } 238fa2dbe2eSBenjamin Herrenschmidt 239fa2dbe2eSBenjamin Herrenschmidt static ssize_t lpc_debug_write(struct file *filp, const char __user *ubuf, 240fa2dbe2eSBenjamin Herrenschmidt size_t count, loff_t *ppos) 241fa2dbe2eSBenjamin Herrenschmidt { 242fa2dbe2eSBenjamin Herrenschmidt struct lpc_debugfs_entry *lpc = filp->private_data; 243fa2dbe2eSBenjamin Herrenschmidt u32 data, pos, len, todo; 244fa2dbe2eSBenjamin Herrenschmidt int rc; 245fa2dbe2eSBenjamin Herrenschmidt 246fa2dbe2eSBenjamin Herrenschmidt if (!access_ok(VERIFY_READ, ubuf, count)) 247fa2dbe2eSBenjamin Herrenschmidt return -EFAULT; 248fa2dbe2eSBenjamin Herrenschmidt 249fa2dbe2eSBenjamin Herrenschmidt todo = count; 250fa2dbe2eSBenjamin Herrenschmidt while (todo) { 251fa2dbe2eSBenjamin Herrenschmidt pos = *ppos; 252fa2dbe2eSBenjamin Herrenschmidt 253fa2dbe2eSBenjamin Herrenschmidt /* 254fa2dbe2eSBenjamin Herrenschmidt * Select access size based on count and alignment and 255fa2dbe2eSBenjamin Herrenschmidt * access type. IO and MEM only support byte acceses, 256fa2dbe2eSBenjamin Herrenschmidt * FW supports all 3. 257fa2dbe2eSBenjamin Herrenschmidt */ 258fa2dbe2eSBenjamin Herrenschmidt len = 1; 259fa2dbe2eSBenjamin Herrenschmidt if (lpc->lpc_type == OPAL_LPC_FW) { 260fa2dbe2eSBenjamin Herrenschmidt if (todo > 3 && (pos & 3) == 0) 261fa2dbe2eSBenjamin Herrenschmidt len = 4; 262fa2dbe2eSBenjamin Herrenschmidt else if (todo > 1 && (pos & 1) == 0) 263fa2dbe2eSBenjamin Herrenschmidt len = 2; 264fa2dbe2eSBenjamin Herrenschmidt } 265fa2dbe2eSBenjamin Herrenschmidt switch(len) { 266fa2dbe2eSBenjamin Herrenschmidt case 4: 267fa2dbe2eSBenjamin Herrenschmidt rc = __get_user(data, (u32 __user *)ubuf); 268fa2dbe2eSBenjamin Herrenschmidt break; 269fa2dbe2eSBenjamin Herrenschmidt case 2: 270fa2dbe2eSBenjamin Herrenschmidt rc = __get_user(data, (u16 __user *)ubuf); 271fa2dbe2eSBenjamin Herrenschmidt break; 272fa2dbe2eSBenjamin Herrenschmidt default: 273fa2dbe2eSBenjamin Herrenschmidt rc = __get_user(data, (u8 __user *)ubuf); 274fa2dbe2eSBenjamin Herrenschmidt break; 275fa2dbe2eSBenjamin Herrenschmidt } 276fa2dbe2eSBenjamin Herrenschmidt if (rc) 277fa2dbe2eSBenjamin Herrenschmidt return -EFAULT; 278fa2dbe2eSBenjamin Herrenschmidt 279fa2dbe2eSBenjamin Herrenschmidt rc = opal_lpc_write(opal_lpc_chip_id, lpc->lpc_type, pos, 280fa2dbe2eSBenjamin Herrenschmidt data, len); 281fa2dbe2eSBenjamin Herrenschmidt if (rc) 282fa2dbe2eSBenjamin Herrenschmidt return -ENXIO; 283fa2dbe2eSBenjamin Herrenschmidt *ppos += len; 284fa2dbe2eSBenjamin Herrenschmidt ubuf += len; 285fa2dbe2eSBenjamin Herrenschmidt todo -= len; 286fa2dbe2eSBenjamin Herrenschmidt } 287fa2dbe2eSBenjamin Herrenschmidt 288fa2dbe2eSBenjamin Herrenschmidt return count; 289fa2dbe2eSBenjamin Herrenschmidt } 290fa2dbe2eSBenjamin Herrenschmidt 291fa2dbe2eSBenjamin Herrenschmidt static const struct file_operations lpc_fops = { 292fa2dbe2eSBenjamin Herrenschmidt .read = lpc_debug_read, 293fa2dbe2eSBenjamin Herrenschmidt .write = lpc_debug_write, 294fa2dbe2eSBenjamin Herrenschmidt .open = simple_open, 295fa2dbe2eSBenjamin Herrenschmidt .llseek = default_llseek, 296fa2dbe2eSBenjamin Herrenschmidt }; 297fa2dbe2eSBenjamin Herrenschmidt 298fa2dbe2eSBenjamin Herrenschmidt static int opal_lpc_debugfs_create_type(struct dentry *folder, 299fa2dbe2eSBenjamin Herrenschmidt const char *fname, 300fa2dbe2eSBenjamin Herrenschmidt enum OpalLPCAddressType type) 301fa2dbe2eSBenjamin Herrenschmidt { 302fa2dbe2eSBenjamin Herrenschmidt struct lpc_debugfs_entry *entry; 303fa2dbe2eSBenjamin Herrenschmidt entry = kzalloc(sizeof(*entry), GFP_KERNEL); 304fa2dbe2eSBenjamin Herrenschmidt if (!entry) 305fa2dbe2eSBenjamin Herrenschmidt return -ENOMEM; 306fa2dbe2eSBenjamin Herrenschmidt entry->lpc_type = type; 307fa2dbe2eSBenjamin Herrenschmidt debugfs_create_file(fname, 0600, folder, entry, &lpc_fops); 308fa2dbe2eSBenjamin Herrenschmidt return 0; 309fa2dbe2eSBenjamin Herrenschmidt } 310fa2dbe2eSBenjamin Herrenschmidt 311fa2dbe2eSBenjamin Herrenschmidt static int opal_lpc_init_debugfs(void) 312fa2dbe2eSBenjamin Herrenschmidt { 313fa2dbe2eSBenjamin Herrenschmidt struct dentry *root; 314fa2dbe2eSBenjamin Herrenschmidt int rc = 0; 315fa2dbe2eSBenjamin Herrenschmidt 316fa2dbe2eSBenjamin Herrenschmidt if (opal_lpc_chip_id < 0) 317fa2dbe2eSBenjamin Herrenschmidt return -ENODEV; 318fa2dbe2eSBenjamin Herrenschmidt 319fa2dbe2eSBenjamin Herrenschmidt root = debugfs_create_dir("lpc", powerpc_debugfs_root); 320fa2dbe2eSBenjamin Herrenschmidt 321fa2dbe2eSBenjamin Herrenschmidt rc |= opal_lpc_debugfs_create_type(root, "io", OPAL_LPC_IO); 322fa2dbe2eSBenjamin Herrenschmidt rc |= opal_lpc_debugfs_create_type(root, "mem", OPAL_LPC_MEM); 323fa2dbe2eSBenjamin Herrenschmidt rc |= opal_lpc_debugfs_create_type(root, "fw", OPAL_LPC_FW); 324fa2dbe2eSBenjamin Herrenschmidt return rc; 325fa2dbe2eSBenjamin Herrenschmidt } 326fa2dbe2eSBenjamin Herrenschmidt device_initcall(opal_lpc_init_debugfs); 327fa2dbe2eSBenjamin Herrenschmidt #endif /* CONFIG_DEBUG_FS */ 328fa2dbe2eSBenjamin Herrenschmidt 3293fafe9c2SBenjamin Herrenschmidt void opal_lpc_init(void) 3303fafe9c2SBenjamin Herrenschmidt { 3313fafe9c2SBenjamin Herrenschmidt struct device_node *np; 3323fafe9c2SBenjamin Herrenschmidt 3333fafe9c2SBenjamin Herrenschmidt /* 3343fafe9c2SBenjamin Herrenschmidt * Look for a Power8 LPC bus tagged as "primary", 3353fafe9c2SBenjamin Herrenschmidt * we currently support only one though the OPAL APIs 3363fafe9c2SBenjamin Herrenschmidt * support any number. 3373fafe9c2SBenjamin Herrenschmidt */ 3383fafe9c2SBenjamin Herrenschmidt for_each_compatible_node(np, NULL, "ibm,power8-lpc") { 3393fafe9c2SBenjamin Herrenschmidt if (!of_device_is_available(np)) 3403fafe9c2SBenjamin Herrenschmidt continue; 3413fafe9c2SBenjamin Herrenschmidt if (!of_get_property(np, "primary", NULL)) 3423fafe9c2SBenjamin Herrenschmidt continue; 3433fafe9c2SBenjamin Herrenschmidt opal_lpc_chip_id = of_get_ibm_chip_id(np); 3443fafe9c2SBenjamin Herrenschmidt break; 3453fafe9c2SBenjamin Herrenschmidt } 3463fafe9c2SBenjamin Herrenschmidt if (opal_lpc_chip_id < 0) 3473fafe9c2SBenjamin Herrenschmidt return; 3483fafe9c2SBenjamin Herrenschmidt 3493fafe9c2SBenjamin Herrenschmidt /* Setup special IO ops */ 3503fafe9c2SBenjamin Herrenschmidt ppc_pci_io = opal_lpc_io; 3513fafe9c2SBenjamin Herrenschmidt isa_io_special = true; 3523fafe9c2SBenjamin Herrenschmidt 3533fafe9c2SBenjamin Herrenschmidt pr_info("OPAL: Power8 LPC bus found, chip ID %d\n", opal_lpc_chip_id); 3543fafe9c2SBenjamin Herrenschmidt } 355