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/ide.h>
28 #include <linux/pci.h>
33 #include <asm/machdep.h>
34 #include <asm/pci-bridge.h>
35 #include <asm/iommu.h>
36 #include <asm/abs_addr.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_pcibios_init
161 * This function checks for all possible system PCI host bridges that connect
162 * PCI buses. The system hypervisor is queried as to the guest partition
163 * ownership status. A pci_controller is built for any bus which is partially
164 * owned or fully owned by this guest partition.
166 void iSeries_pcibios_init(void)
168 struct pci_controller *phb;
169 struct device_node *root = of_find_node_by_path("/");
170 struct device_node *node = NULL;
173 printk(KERN_CRIT "iSeries_pcibios_init: can't find root "
177 while ((node = of_get_next_child(root, node)) != NULL) {
181 if ((node->type == NULL) || (strcmp(node->type, "pci") != 0))
184 busp = (u32 *)get_property(node, "bus-range", NULL);
188 printk("bus %d appears to exist\n", bus);
189 phb = pcibios_alloc_controller(node);
193 phb->pci_mem_offset = phb->local_number = bus;
194 phb->first_busno = bus;
195 phb->last_busno = bus;
196 phb->ops = &iSeries_pci_ops;
205 * iSeries_pci_final_fixup(void)
207 void __init iSeries_pci_final_fixup(void)
209 struct pci_dev *pdev = NULL;
210 struct device_node *node;
213 /* Fix up at the device node and pci_dev relationship */
214 mf_display_src(0xC9000100);
216 printk("pcibios_final_fixup\n");
217 for_each_pci_dev(pdev) {
218 node = find_Device_Node(pdev->bus->number, pdev->devfn);
219 printk("pci dev %p (%x.%x), node %p\n", pdev,
220 pdev->bus->number, pdev->devfn, node);
223 struct pci_dn *pdn = PCI_DN(node);
226 agent = (u32 *)get_property(node, "linux,agent-id",
228 if ((pdn != NULL) && (agent != NULL)) {
229 u8 irq = iSeries_allocate_IRQ(pdn->busno, 0,
233 err = HvCallXm_connectBusUnit(pdn->busno, pdn->bussubno,
236 pci_Log_Error("Connect Bus Unit",
237 pdn->busno, pdn->bussubno, *agent, err);
239 err = HvCallPci_configStore8(pdn->busno, pdn->bussubno,
244 pci_Log_Error("PciCfgStore Irq Failed!",
245 pdn->busno, pdn->bussubno, *agent, err);
252 pdev->sysdata = (void *)node;
253 PCI_DN(node)->pcidev = pdev;
254 allocate_device_bars(pdev);
255 iSeries_Device_Information(pdev, DeviceCount);
256 iommu_devnode_init_iSeries(node);
258 printk("PCI: Device Tree not found for 0x%016lX\n",
259 (unsigned long)pdev);
261 iSeries_activate_IRQs();
262 mf_display_src(0xC9000200);
265 void pcibios_fixup_bus(struct pci_bus *PciBus)
269 void pcibios_fixup_resources(struct pci_dev *pdev)
274 * I/0 Memory copy MUST use mmio commands on iSeries
275 * To do; For performance, include the hv call directly
277 void iSeries_memset_io(volatile void __iomem *dest, char c, size_t Count)
280 long NumberOfBytes = Count;
282 while (NumberOfBytes > 0) {
283 iSeries_Write_Byte(ByteValue, dest++);
287 EXPORT_SYMBOL(iSeries_memset_io);
289 void iSeries_memcpy_toio(volatile void __iomem *dest, void *source, size_t count)
292 long NumberOfBytes = count;
294 while (NumberOfBytes > 0) {
295 iSeries_Write_Byte(*src++, dest++);
299 EXPORT_SYMBOL(iSeries_memcpy_toio);
301 void iSeries_memcpy_fromio(void *dest, const volatile void __iomem *src, size_t count)
304 long NumberOfBytes = count;
306 while (NumberOfBytes > 0) {
307 *dst++ = iSeries_Read_Byte(src++);
311 EXPORT_SYMBOL(iSeries_memcpy_fromio);
314 * Look down the chain to find the matching Device Device
316 static struct device_node *find_Device_Node(int bus, int devfn)
318 struct device_node *node;
320 for (node = NULL; (node = of_find_all_nodes(node)); ) {
321 struct pci_dn *pdn = PCI_DN(node);
323 if (pdn && (bus == pdn->busno) && (devfn == pdn->devfn))
331 * Returns the device node for the passed pci_dev
332 * Sanity Check Node PciDev to passed pci_dev
333 * If none is found, returns a NULL which the client must handle.
335 static struct device_node *get_Device_Node(struct pci_dev *pdev)
337 struct device_node *node;
339 node = pdev->sysdata;
340 if (node == NULL || PCI_DN(node)->pcidev != pdev)
341 node = find_Device_Node(pdev->bus->number, pdev->devfn);
347 * Config space read and write functions.
348 * For now at least, we look for the device node for the bus and devfn
349 * that we are asked to access. It may be possible to translate the devfn
350 * to a subbus and deviceid more directly.
352 static u64 hv_cfg_read_func[4] = {
353 HvCallPciConfigLoad8, HvCallPciConfigLoad16,
354 HvCallPciConfigLoad32, HvCallPciConfigLoad32
357 static u64 hv_cfg_write_func[4] = {
358 HvCallPciConfigStore8, HvCallPciConfigStore16,
359 HvCallPciConfigStore32, HvCallPciConfigStore32
363 * Read PCI config space
365 static int iSeries_pci_read_config(struct pci_bus *bus, unsigned int devfn,
366 int offset, int size, u32 *val)
368 struct device_node *node = find_Device_Node(bus->number, devfn);
370 struct HvCallPci_LoadReturn ret;
373 return PCIBIOS_DEVICE_NOT_FOUND;
376 return PCIBIOS_BAD_REGISTER_NUMBER;
379 fn = hv_cfg_read_func[(size - 1) & 3];
380 HvCall3Ret16(fn, &ret, iseries_ds_addr(node), offset, 0);
384 return PCIBIOS_DEVICE_NOT_FOUND; /* or something */
392 * Write PCI config space
395 static int iSeries_pci_write_config(struct pci_bus *bus, unsigned int devfn,
396 int offset, int size, u32 val)
398 struct device_node *node = find_Device_Node(bus->number, devfn);
403 return PCIBIOS_DEVICE_NOT_FOUND;
405 return PCIBIOS_BAD_REGISTER_NUMBER;
407 fn = hv_cfg_write_func[(size - 1) & 3];
408 ret = HvCall4(fn, iseries_ds_addr(node), offset, val, 0);
411 return PCIBIOS_DEVICE_NOT_FOUND;
416 static struct pci_ops iSeries_pci_ops = {
417 .read = iSeries_pci_read_config,
418 .write = iSeries_pci_write_config
423 * -> On Failure, print and log information.
424 * Increment Retry Count, if exceeds max, panic partition.
426 * PCI: Device 23.90 ReadL I/O Error( 0): 0x1234
427 * PCI: Device 23.90 ReadL Retry( 1)
428 * PCI: Device 23.90 ReadL Retry Successful(1)
430 static int CheckReturnCode(char *TextHdr, struct device_node *DevNode,
434 struct pci_dn *pdn = PCI_DN(DevNode);
437 printk("PCI: %s: Device 0x%04X:%02X I/O Error(%2d): 0x%04X\n",
438 TextHdr, pdn->busno, pdn->devfn,
441 * Bump the retry and check for retry count exceeded.
442 * If, Exceeded, panic the system.
444 if (((*retry) > Pci_Retry_Max) &&
445 (Pci_Error_Flag > 0)) {
446 mf_display_src(0xB6000103);
448 panic("PCI: Hardware I/O Error, SRC B6000103, "
449 "Automatic Reboot Disabled.\n");
451 return -1; /* Retry Try */
457 * Translate the I/O Address into a device node, bar, and bar offset.
458 * Note: Make sure the passed variable end up on the stack to avoid
459 * the exposure of being device global.
461 static inline struct device_node *xlate_iomm_address(
462 const volatile void __iomem *IoAddress,
463 u64 *dsaptr, u64 *BarOffsetPtr)
465 unsigned long OrigIoAddr;
466 unsigned long BaseIoAddr;
467 unsigned long TableIndex;
468 struct device_node *DevNode;
470 OrigIoAddr = (unsigned long __force)IoAddress;
471 if ((OrigIoAddr < BASE_IO_MEMORY) || (OrigIoAddr >= max_io_memory))
473 BaseIoAddr = OrigIoAddr - BASE_IO_MEMORY;
474 TableIndex = BaseIoAddr / IOMM_TABLE_ENTRY_SIZE;
475 DevNode = iomm_table[TableIndex];
477 if (DevNode != NULL) {
478 int barnum = iobar_table[TableIndex];
479 *dsaptr = iseries_ds_addr(DevNode) | (barnum << 24);
480 *BarOffsetPtr = BaseIoAddr % IOMM_TABLE_ENTRY_SIZE;
482 panic("PCI: Invalid PCI IoAddress detected!\n");
487 * Read MM I/O Instructions for the iSeries
488 * On MM I/O error, all ones are returned and iSeries_pci_IoError is cal
489 * else, data is returned in big Endian format.
491 * iSeries_Read_Byte = Read Byte ( 8 bit)
492 * iSeries_Read_Word = Read Word (16 bit)
493 * iSeries_Read_Long = Read Long (32 bit)
495 u8 iSeries_Read_Byte(const volatile void __iomem *IoAddress)
500 struct HvCallPci_LoadReturn ret;
501 struct device_node *DevNode =
502 xlate_iomm_address(IoAddress, &dsa, &BarOffset);
504 if (DevNode == NULL) {
505 static unsigned long last_jiffies;
506 static int num_printed;
508 if ((jiffies - last_jiffies) > 60 * HZ) {
509 last_jiffies = jiffies;
512 if (num_printed++ < 10)
513 printk(KERN_ERR "iSeries_Read_Byte: invalid access at IO address %p\n", IoAddress);
517 HvCall3Ret16(HvCallPciBarLoad8, &ret, dsa, BarOffset, 0);
518 } while (CheckReturnCode("RDB", DevNode, &retry, ret.rc) != 0);
520 return (u8)ret.value;
522 EXPORT_SYMBOL(iSeries_Read_Byte);
524 u16 iSeries_Read_Word(const volatile void __iomem *IoAddress)
529 struct HvCallPci_LoadReturn ret;
530 struct device_node *DevNode =
531 xlate_iomm_address(IoAddress, &dsa, &BarOffset);
533 if (DevNode == NULL) {
534 static unsigned long last_jiffies;
535 static int num_printed;
537 if ((jiffies - last_jiffies) > 60 * HZ) {
538 last_jiffies = jiffies;
541 if (num_printed++ < 10)
542 printk(KERN_ERR "iSeries_Read_Word: invalid access at IO address %p\n", IoAddress);
546 HvCall3Ret16(HvCallPciBarLoad16, &ret, dsa,
548 } while (CheckReturnCode("RDW", DevNode, &retry, ret.rc) != 0);
550 return swab16((u16)ret.value);
552 EXPORT_SYMBOL(iSeries_Read_Word);
554 u32 iSeries_Read_Long(const volatile void __iomem *IoAddress)
559 struct HvCallPci_LoadReturn ret;
560 struct device_node *DevNode =
561 xlate_iomm_address(IoAddress, &dsa, &BarOffset);
563 if (DevNode == NULL) {
564 static unsigned long last_jiffies;
565 static int num_printed;
567 if ((jiffies - last_jiffies) > 60 * HZ) {
568 last_jiffies = jiffies;
571 if (num_printed++ < 10)
572 printk(KERN_ERR "iSeries_Read_Long: invalid access at IO address %p\n", IoAddress);
576 HvCall3Ret16(HvCallPciBarLoad32, &ret, dsa,
578 } while (CheckReturnCode("RDL", DevNode, &retry, ret.rc) != 0);
580 return swab32((u32)ret.value);
582 EXPORT_SYMBOL(iSeries_Read_Long);
585 * Write MM I/O Instructions for the iSeries
587 * iSeries_Write_Byte = Write Byte (8 bit)
588 * iSeries_Write_Word = Write Word(16 bit)
589 * iSeries_Write_Long = Write Long(32 bit)
591 void iSeries_Write_Byte(u8 data, volatile void __iomem *IoAddress)
597 struct device_node *DevNode =
598 xlate_iomm_address(IoAddress, &dsa, &BarOffset);
600 if (DevNode == NULL) {
601 static unsigned long last_jiffies;
602 static int num_printed;
604 if ((jiffies - last_jiffies) > 60 * HZ) {
605 last_jiffies = jiffies;
608 if (num_printed++ < 10)
609 printk(KERN_ERR "iSeries_Write_Byte: invalid access at IO address %p\n", IoAddress);
613 rc = HvCall4(HvCallPciBarStore8, dsa, BarOffset, data, 0);
614 } while (CheckReturnCode("WWB", DevNode, &retry, rc) != 0);
616 EXPORT_SYMBOL(iSeries_Write_Byte);
618 void iSeries_Write_Word(u16 data, volatile void __iomem *IoAddress)
624 struct device_node *DevNode =
625 xlate_iomm_address(IoAddress, &dsa, &BarOffset);
627 if (DevNode == NULL) {
628 static unsigned long last_jiffies;
629 static int num_printed;
631 if ((jiffies - last_jiffies) > 60 * HZ) {
632 last_jiffies = jiffies;
635 if (num_printed++ < 10)
636 printk(KERN_ERR "iSeries_Write_Word: invalid access at IO address %p\n", IoAddress);
640 rc = HvCall4(HvCallPciBarStore16, dsa, BarOffset, swab16(data), 0);
641 } while (CheckReturnCode("WWW", DevNode, &retry, rc) != 0);
643 EXPORT_SYMBOL(iSeries_Write_Word);
645 void iSeries_Write_Long(u32 data, volatile void __iomem *IoAddress)
651 struct device_node *DevNode =
652 xlate_iomm_address(IoAddress, &dsa, &BarOffset);
654 if (DevNode == NULL) {
655 static unsigned long last_jiffies;
656 static int num_printed;
658 if ((jiffies - last_jiffies) > 60 * HZ) {
659 last_jiffies = jiffies;
662 if (num_printed++ < 10)
663 printk(KERN_ERR "iSeries_Write_Long: invalid access at IO address %p\n", IoAddress);
667 rc = HvCall4(HvCallPciBarStore32, dsa, BarOffset, swab32(data), 0);
668 } while (CheckReturnCode("WWL", DevNode, &retry, rc) != 0);
670 EXPORT_SYMBOL(iSeries_Write_Long);