2 * Copyright (C) 2001 Allan Trautman, IBM Corporation
4 * iSeries specific routines for PCI.
6 * Based on code from pci.c and iSeries_pci.c 32bit
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 #include <linux/kernel.h>
23 #include <linux/list.h>
24 #include <linux/string.h>
25 #include <linux/init.h>
26 #include <linux/module.h>
27 #include <linux/pci.h>
32 #include <asm/machdep.h>
33 #include <asm/pci-bridge.h>
34 #include <asm/iommu.h>
35 #include <asm/abs_addr.h>
36 #include <asm/firmware.h>
38 #include <asm/iseries/hv_call_xm.h>
39 #include <asm/iseries/mf.h>
40 #include <asm/iseries/iommu.h>
42 #include <asm/ppc-pci.h>
49 * Forward declares of prototypes.
51 static struct device_node *find_Device_Node(int bus, int devfn);
53 static int Pci_Retry_Max = 3; /* Only retry 3 times */
54 static int Pci_Error_Flag = 1; /* Set Retry Error on. */
56 static struct pci_ops iSeries_pci_ops;
60 * Each Entry size is 4 MB * 1024 Entries = 4GB I/O address space.
62 #define IOMM_TABLE_MAX_ENTRIES 1024
63 #define IOMM_TABLE_ENTRY_SIZE 0x0000000000400000UL
64 #define BASE_IO_MEMORY 0xE000000000000000UL
66 static unsigned long max_io_memory = BASE_IO_MEMORY;
67 static long current_iomm_table_entry;
72 static struct device_node *iomm_table[IOMM_TABLE_MAX_ENTRIES];
73 static u8 iobar_table[IOMM_TABLE_MAX_ENTRIES];
75 static const char pci_io_text[] = "iSeries PCI I/O";
76 static DEFINE_SPINLOCK(iomm_table_lock);
79 * iomm_table_allocate_entry
81 * Adds pci_dev entry in address translation table
83 * - Allocates the number of entries required in table base on BAR
85 * - Allocates starting at BASE_IO_MEMORY and increases.
86 * - The size is round up to be a multiple of entry size.
87 * - CurrentIndex is incremented to keep track of the last entry.
88 * - Builds the resource entry for allocated BARs.
90 static void iomm_table_allocate_entry(struct pci_dev *dev, int bar_num)
92 struct resource *bar_res = &dev->resource[bar_num];
93 long bar_size = pci_resource_len(dev, bar_num);
96 * No space to allocate, quick exit, skip Allocation.
101 * Set Resource values.
103 spin_lock(&iomm_table_lock);
104 bar_res->name = pci_io_text;
105 bar_res->start = BASE_IO_MEMORY +
106 IOMM_TABLE_ENTRY_SIZE * current_iomm_table_entry;
107 bar_res->end = bar_res->start + bar_size - 1;
109 * Allocate the number of table entries needed for BAR.
111 while (bar_size > 0 ) {
112 iomm_table[current_iomm_table_entry] = dev->sysdata;
113 iobar_table[current_iomm_table_entry] = bar_num;
114 bar_size -= IOMM_TABLE_ENTRY_SIZE;
115 ++current_iomm_table_entry;
117 max_io_memory = BASE_IO_MEMORY +
118 IOMM_TABLE_ENTRY_SIZE * current_iomm_table_entry;
119 spin_unlock(&iomm_table_lock);
123 * allocate_device_bars
125 * - Allocates ALL pci_dev BAR's and updates the resources with the
126 * BAR value. BARS with zero length will have the resources
127 * The HvCallPci_getBarParms is used to get the size of the BAR
128 * space. It calls iomm_table_allocate_entry to allocate
130 * - Loops through The Bar resources(0 - 5) including the ROM
133 static void allocate_device_bars(struct pci_dev *dev)
137 for (bar_num = 0; bar_num <= PCI_ROM_RESOURCE; ++bar_num)
138 iomm_table_allocate_entry(dev, bar_num);
142 * Log error information to system console.
143 * Filter out the device not there errors.
144 * PCI: EADs Connect Failed 0x18.58.10 Rc: 0x00xx
145 * PCI: Read Vendor Failed 0x18.58.10 Rc: 0x00xx
146 * PCI: Connect Bus Unit Failed 0x18.58.10 Rc: 0x00xx
148 static void pci_Log_Error(char *Error_Text, int Bus, int SubBus,
149 int AgentId, int HvRc)
153 printk(KERN_ERR "PCI: %s Failed: 0x%02X.%02X.%02X Rc: 0x%04X",
154 Error_Text, Bus, SubBus, AgentId, HvRc);
158 * iSeries_pci_final_fixup(void)
160 void __init iSeries_pci_final_fixup(void)
162 struct pci_dev *pdev = NULL;
163 struct device_node *node;
166 /* Fix up at the device node and pci_dev relationship */
167 mf_display_src(0xC9000100);
169 printk("pcibios_final_fixup\n");
170 for_each_pci_dev(pdev) {
171 node = find_Device_Node(pdev->bus->number, pdev->devfn);
172 printk("pci dev %p (%x.%x), node %p\n", pdev,
173 pdev->bus->number, pdev->devfn, node);
176 struct pci_dn *pdn = PCI_DN(node);
179 agent = of_get_property(node, "linux,agent-id", NULL);
180 if ((pdn != NULL) && (agent != NULL)) {
181 u8 irq = iSeries_allocate_IRQ(pdn->busno, 0,
185 err = HvCallXm_connectBusUnit(pdn->busno, pdn->bussubno,
188 pci_Log_Error("Connect Bus Unit",
189 pdn->busno, pdn->bussubno, *agent, err);
191 err = HvCallPci_configStore8(pdn->busno, pdn->bussubno,
196 pci_Log_Error("PciCfgStore Irq Failed!",
197 pdn->busno, pdn->bussubno, *agent, err);
204 pdev->sysdata = (void *)node;
205 PCI_DN(node)->pcidev = pdev;
206 allocate_device_bars(pdev);
207 iSeries_Device_Information(pdev, DeviceCount);
208 iommu_devnode_init_iSeries(pdev, node);
210 printk("PCI: Device Tree not found for 0x%016lX\n",
211 (unsigned long)pdev);
213 iSeries_activate_IRQs();
214 mf_display_src(0xC9000200);
218 * Look down the chain to find the matching Device Device
220 static struct device_node *find_Device_Node(int bus, int devfn)
222 struct device_node *node;
224 for (node = NULL; (node = of_find_all_nodes(node)); ) {
225 struct pci_dn *pdn = PCI_DN(node);
227 if (pdn && (bus == pdn->busno) && (devfn == pdn->devfn))
235 * Returns the device node for the passed pci_dev
236 * Sanity Check Node PciDev to passed pci_dev
237 * If none is found, returns a NULL which the client must handle.
239 static struct device_node *get_Device_Node(struct pci_dev *pdev)
241 struct device_node *node;
243 node = pdev->sysdata;
244 if (node == NULL || PCI_DN(node)->pcidev != pdev)
245 node = find_Device_Node(pdev->bus->number, pdev->devfn);
251 * Config space read and write functions.
252 * For now at least, we look for the device node for the bus and devfn
253 * that we are asked to access. It may be possible to translate the devfn
254 * to a subbus and deviceid more directly.
256 static u64 hv_cfg_read_func[4] = {
257 HvCallPciConfigLoad8, HvCallPciConfigLoad16,
258 HvCallPciConfigLoad32, HvCallPciConfigLoad32
261 static u64 hv_cfg_write_func[4] = {
262 HvCallPciConfigStore8, HvCallPciConfigStore16,
263 HvCallPciConfigStore32, HvCallPciConfigStore32
267 * Read PCI config space
269 static int iSeries_pci_read_config(struct pci_bus *bus, unsigned int devfn,
270 int offset, int size, u32 *val)
272 struct device_node *node = find_Device_Node(bus->number, devfn);
274 struct HvCallPci_LoadReturn ret;
277 return PCIBIOS_DEVICE_NOT_FOUND;
280 return PCIBIOS_BAD_REGISTER_NUMBER;
283 fn = hv_cfg_read_func[(size - 1) & 3];
284 HvCall3Ret16(fn, &ret, iseries_ds_addr(node), offset, 0);
288 return PCIBIOS_DEVICE_NOT_FOUND; /* or something */
296 * Write PCI config space
299 static int iSeries_pci_write_config(struct pci_bus *bus, unsigned int devfn,
300 int offset, int size, u32 val)
302 struct device_node *node = find_Device_Node(bus->number, devfn);
307 return PCIBIOS_DEVICE_NOT_FOUND;
309 return PCIBIOS_BAD_REGISTER_NUMBER;
311 fn = hv_cfg_write_func[(size - 1) & 3];
312 ret = HvCall4(fn, iseries_ds_addr(node), offset, val, 0);
315 return PCIBIOS_DEVICE_NOT_FOUND;
320 static struct pci_ops iSeries_pci_ops = {
321 .read = iSeries_pci_read_config,
322 .write = iSeries_pci_write_config
327 * -> On Failure, print and log information.
328 * Increment Retry Count, if exceeds max, panic partition.
330 * PCI: Device 23.90 ReadL I/O Error( 0): 0x1234
331 * PCI: Device 23.90 ReadL Retry( 1)
332 * PCI: Device 23.90 ReadL Retry Successful(1)
334 static int CheckReturnCode(char *TextHdr, struct device_node *DevNode,
338 struct pci_dn *pdn = PCI_DN(DevNode);
341 printk("PCI: %s: Device 0x%04X:%02X I/O Error(%2d): 0x%04X\n",
342 TextHdr, pdn->busno, pdn->devfn,
345 * Bump the retry and check for retry count exceeded.
346 * If, Exceeded, panic the system.
348 if (((*retry) > Pci_Retry_Max) &&
349 (Pci_Error_Flag > 0)) {
350 mf_display_src(0xB6000103);
352 panic("PCI: Hardware I/O Error, SRC B6000103, "
353 "Automatic Reboot Disabled.\n");
355 return -1; /* Retry Try */
361 * Translate the I/O Address into a device node, bar, and bar offset.
362 * Note: Make sure the passed variable end up on the stack to avoid
363 * the exposure of being device global.
365 static inline struct device_node *xlate_iomm_address(
366 const volatile void __iomem *IoAddress,
367 u64 *dsaptr, u64 *BarOffsetPtr)
369 unsigned long OrigIoAddr;
370 unsigned long BaseIoAddr;
371 unsigned long TableIndex;
372 struct device_node *DevNode;
374 OrigIoAddr = (unsigned long __force)IoAddress;
375 if ((OrigIoAddr < BASE_IO_MEMORY) || (OrigIoAddr >= max_io_memory))
377 BaseIoAddr = OrigIoAddr - BASE_IO_MEMORY;
378 TableIndex = BaseIoAddr / IOMM_TABLE_ENTRY_SIZE;
379 DevNode = iomm_table[TableIndex];
381 if (DevNode != NULL) {
382 int barnum = iobar_table[TableIndex];
383 *dsaptr = iseries_ds_addr(DevNode) | (barnum << 24);
384 *BarOffsetPtr = BaseIoAddr % IOMM_TABLE_ENTRY_SIZE;
386 panic("PCI: Invalid PCI IoAddress detected!\n");
391 * Read MM I/O Instructions for the iSeries
392 * On MM I/O error, all ones are returned and iSeries_pci_IoError is cal
393 * else, data is returned in Big Endian format.
395 static u8 iSeries_Read_Byte(const volatile void __iomem *IoAddress)
400 struct HvCallPci_LoadReturn ret;
401 struct device_node *DevNode =
402 xlate_iomm_address(IoAddress, &dsa, &BarOffset);
404 if (DevNode == NULL) {
405 static unsigned long last_jiffies;
406 static int num_printed;
408 if ((jiffies - last_jiffies) > 60 * HZ) {
409 last_jiffies = jiffies;
412 if (num_printed++ < 10)
413 printk(KERN_ERR "iSeries_Read_Byte: invalid access at IO address %p\n",
418 HvCall3Ret16(HvCallPciBarLoad8, &ret, dsa, BarOffset, 0);
419 } while (CheckReturnCode("RDB", DevNode, &retry, ret.rc) != 0);
424 static u16 iSeries_Read_Word(const volatile void __iomem *IoAddress)
429 struct HvCallPci_LoadReturn ret;
430 struct device_node *DevNode =
431 xlate_iomm_address(IoAddress, &dsa, &BarOffset);
433 if (DevNode == NULL) {
434 static unsigned long last_jiffies;
435 static int num_printed;
437 if ((jiffies - last_jiffies) > 60 * HZ) {
438 last_jiffies = jiffies;
441 if (num_printed++ < 10)
442 printk(KERN_ERR "iSeries_Read_Word: invalid access at IO address %p\n",
447 HvCall3Ret16(HvCallPciBarLoad16, &ret, dsa,
449 } while (CheckReturnCode("RDW", DevNode, &retry, ret.rc) != 0);
454 static u32 iSeries_Read_Long(const volatile void __iomem *IoAddress)
459 struct HvCallPci_LoadReturn ret;
460 struct device_node *DevNode =
461 xlate_iomm_address(IoAddress, &dsa, &BarOffset);
463 if (DevNode == NULL) {
464 static unsigned long last_jiffies;
465 static int num_printed;
467 if ((jiffies - last_jiffies) > 60 * HZ) {
468 last_jiffies = jiffies;
471 if (num_printed++ < 10)
472 printk(KERN_ERR "iSeries_Read_Long: invalid access at IO address %p\n",
477 HvCall3Ret16(HvCallPciBarLoad32, &ret, dsa,
479 } while (CheckReturnCode("RDL", DevNode, &retry, ret.rc) != 0);
485 * Write MM I/O Instructions for the iSeries
488 static void iSeries_Write_Byte(u8 data, volatile void __iomem *IoAddress)
494 struct device_node *DevNode =
495 xlate_iomm_address(IoAddress, &dsa, &BarOffset);
497 if (DevNode == NULL) {
498 static unsigned long last_jiffies;
499 static int num_printed;
501 if ((jiffies - last_jiffies) > 60 * HZ) {
502 last_jiffies = jiffies;
505 if (num_printed++ < 10)
506 printk(KERN_ERR "iSeries_Write_Byte: invalid access at IO address %p\n", IoAddress);
510 rc = HvCall4(HvCallPciBarStore8, dsa, BarOffset, data, 0);
511 } while (CheckReturnCode("WWB", DevNode, &retry, rc) != 0);
514 static void iSeries_Write_Word(u16 data, volatile void __iomem *IoAddress)
520 struct device_node *DevNode =
521 xlate_iomm_address(IoAddress, &dsa, &BarOffset);
523 if (DevNode == NULL) {
524 static unsigned long last_jiffies;
525 static int num_printed;
527 if ((jiffies - last_jiffies) > 60 * HZ) {
528 last_jiffies = jiffies;
531 if (num_printed++ < 10)
532 printk(KERN_ERR "iSeries_Write_Word: invalid access at IO address %p\n",
537 rc = HvCall4(HvCallPciBarStore16, dsa, BarOffset, data, 0);
538 } while (CheckReturnCode("WWW", DevNode, &retry, rc) != 0);
541 static void iSeries_Write_Long(u32 data, volatile void __iomem *IoAddress)
547 struct device_node *DevNode =
548 xlate_iomm_address(IoAddress, &dsa, &BarOffset);
550 if (DevNode == NULL) {
551 static unsigned long last_jiffies;
552 static int num_printed;
554 if ((jiffies - last_jiffies) > 60 * HZ) {
555 last_jiffies = jiffies;
558 if (num_printed++ < 10)
559 printk(KERN_ERR "iSeries_Write_Long: invalid access at IO address %p\n",
564 rc = HvCall4(HvCallPciBarStore32, dsa, BarOffset, data, 0);
565 } while (CheckReturnCode("WWL", DevNode, &retry, rc) != 0);
568 static u8 iseries_readb(const volatile void __iomem *addr)
570 return iSeries_Read_Byte(addr);
573 static u16 iseries_readw(const volatile void __iomem *addr)
575 return le16_to_cpu(iSeries_Read_Word(addr));
578 static u32 iseries_readl(const volatile void __iomem *addr)
580 return le32_to_cpu(iSeries_Read_Long(addr));
583 static u16 iseries_readw_be(const volatile void __iomem *addr)
585 return iSeries_Read_Word(addr);
588 static u32 iseries_readl_be(const volatile void __iomem *addr)
590 return iSeries_Read_Long(addr);
593 static void iseries_writeb(u8 data, volatile void __iomem *addr)
595 iSeries_Write_Byte(data, addr);
598 static void iseries_writew(u16 data, volatile void __iomem *addr)
600 iSeries_Write_Word(cpu_to_le16(data), addr);
603 static void iseries_writel(u32 data, volatile void __iomem *addr)
605 iSeries_Write_Long(cpu_to_le32(data), addr);
608 static void iseries_writew_be(u16 data, volatile void __iomem *addr)
610 iSeries_Write_Word(data, addr);
613 static void iseries_writel_be(u32 data, volatile void __iomem *addr)
615 iSeries_Write_Long(data, addr);
618 static void iseries_readsb(const volatile void __iomem *addr, void *buf,
623 *(dst++) = iSeries_Read_Byte(addr);
626 static void iseries_readsw(const volatile void __iomem *addr, void *buf,
631 *(dst++) = iSeries_Read_Word(addr);
634 static void iseries_readsl(const volatile void __iomem *addr, void *buf,
639 *(dst++) = iSeries_Read_Long(addr);
642 static void iseries_writesb(volatile void __iomem *addr, const void *buf,
647 iSeries_Write_Byte(*(src++), addr);
650 static void iseries_writesw(volatile void __iomem *addr, const void *buf,
653 const u16 *src = buf;
655 iSeries_Write_Word(*(src++), addr);
658 static void iseries_writesl(volatile void __iomem *addr, const void *buf,
661 const u32 *src = buf;
663 iSeries_Write_Long(*(src++), addr);
666 static void iseries_memset_io(volatile void __iomem *addr, int c,
669 volatile char __iomem *d = addr;
672 iSeries_Write_Byte(c, d++);
675 static void iseries_memcpy_fromio(void *dest, const volatile void __iomem *src,
679 const volatile char __iomem *s = src;
682 *d++ = iSeries_Read_Byte(s++);
685 static void iseries_memcpy_toio(volatile void __iomem *dest, const void *src,
689 volatile char __iomem *d = dest;
692 iSeries_Write_Byte(*s++, d++);
695 /* We only set MMIO ops. The default PIO ops will be default
696 * to the MMIO ops + pci_io_base which is 0 on iSeries as
697 * expected so both should work.
699 * Note that we don't implement the readq/writeq versions as
700 * I don't know of an HV call for doing so. Thus, the default
701 * operation will be used instead, which will fault a the value
702 * return by iSeries for MMIO addresses always hits a non mapped
703 * area. This is as good as the BUG() we used to have there.
705 static struct ppc_pci_io __initdata iseries_pci_io = {
706 .readb = iseries_readb,
707 .readw = iseries_readw,
708 .readl = iseries_readl,
709 .readw_be = iseries_readw_be,
710 .readl_be = iseries_readl_be,
711 .writeb = iseries_writeb,
712 .writew = iseries_writew,
713 .writel = iseries_writel,
714 .writew_be = iseries_writew_be,
715 .writel_be = iseries_writel_be,
716 .readsb = iseries_readsb,
717 .readsw = iseries_readsw,
718 .readsl = iseries_readsl,
719 .writesb = iseries_writesb,
720 .writesw = iseries_writesw,
721 .writesl = iseries_writesl,
722 .memset_io = iseries_memset_io,
723 .memcpy_fromio = iseries_memcpy_fromio,
724 .memcpy_toio = iseries_memcpy_toio,
728 * iSeries_pcibios_init
731 * This function checks for all possible system PCI host bridges that connect
732 * PCI buses. The system hypervisor is queried as to the guest partition
733 * ownership status. A pci_controller is built for any bus which is partially
734 * owned or fully owned by this guest partition.
736 void __init iSeries_pcibios_init(void)
738 struct pci_controller *phb;
739 struct device_node *root = of_find_node_by_path("/");
740 struct device_node *node = NULL;
742 /* Install IO hooks */
743 ppc_pci_io = iseries_pci_io;
745 /* iSeries has no IO space in the common sense, it needs to set
751 printk(KERN_CRIT "iSeries_pcibios_init: can't find root "
755 while ((node = of_get_next_child(root, node)) != NULL) {
759 if ((node->type == NULL) || (strcmp(node->type, "pci") != 0))
762 busp = of_get_property(node, "bus-range", NULL);
766 printk("bus %d appears to exist\n", bus);
767 phb = pcibios_alloc_controller(node);
771 phb->pci_mem_offset = bus;
772 phb->first_busno = bus;
773 phb->last_busno = bus;
774 phb->ops = &iSeries_pci_ops;