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>
37 #include <asm/firmware.h>
39 #include <asm/iseries/hv_call_xm.h>
40 #include <asm/iseries/mf.h>
41 #include <asm/iseries/iommu.h>
43 #include <asm/ppc-pci.h>
50 * Forward declares of prototypes.
52 static struct device_node *find_Device_Node(int bus, int devfn);
54 static int Pci_Retry_Max = 3; /* Only retry 3 times */
55 static int Pci_Error_Flag = 1; /* Set Retry Error on. */
57 static struct pci_ops iSeries_pci_ops;
61 * Each Entry size is 4 MB * 1024 Entries = 4GB I/O address space.
63 #define IOMM_TABLE_MAX_ENTRIES 1024
64 #define IOMM_TABLE_ENTRY_SIZE 0x0000000000400000UL
65 #define BASE_IO_MEMORY 0xE000000000000000UL
67 static unsigned long max_io_memory = BASE_IO_MEMORY;
68 static long current_iomm_table_entry;
73 static struct device_node *iomm_table[IOMM_TABLE_MAX_ENTRIES];
74 static u8 iobar_table[IOMM_TABLE_MAX_ENTRIES];
76 static const char pci_io_text[] = "iSeries PCI I/O";
77 static DEFINE_SPINLOCK(iomm_table_lock);
80 * iomm_table_allocate_entry
82 * Adds pci_dev entry in address translation table
84 * - Allocates the number of entries required in table base on BAR
86 * - Allocates starting at BASE_IO_MEMORY and increases.
87 * - The size is round up to be a multiple of entry size.
88 * - CurrentIndex is incremented to keep track of the last entry.
89 * - Builds the resource entry for allocated BARs.
91 static void iomm_table_allocate_entry(struct pci_dev *dev, int bar_num)
93 struct resource *bar_res = &dev->resource[bar_num];
94 long bar_size = pci_resource_len(dev, bar_num);
97 * No space to allocate, quick exit, skip Allocation.
102 * Set Resource values.
104 spin_lock(&iomm_table_lock);
105 bar_res->name = pci_io_text;
106 bar_res->start = BASE_IO_MEMORY +
107 IOMM_TABLE_ENTRY_SIZE * current_iomm_table_entry;
108 bar_res->end = bar_res->start + bar_size - 1;
110 * Allocate the number of table entries needed for BAR.
112 while (bar_size > 0 ) {
113 iomm_table[current_iomm_table_entry] = dev->sysdata;
114 iobar_table[current_iomm_table_entry] = bar_num;
115 bar_size -= IOMM_TABLE_ENTRY_SIZE;
116 ++current_iomm_table_entry;
118 max_io_memory = BASE_IO_MEMORY +
119 IOMM_TABLE_ENTRY_SIZE * current_iomm_table_entry;
120 spin_unlock(&iomm_table_lock);
124 * allocate_device_bars
126 * - Allocates ALL pci_dev BAR's and updates the resources with the
127 * BAR value. BARS with zero length will have the resources
128 * The HvCallPci_getBarParms is used to get the size of the BAR
129 * space. It calls iomm_table_allocate_entry to allocate
131 * - Loops through The Bar resources(0 - 5) including the ROM
134 static void allocate_device_bars(struct pci_dev *dev)
138 for (bar_num = 0; bar_num <= PCI_ROM_RESOURCE; ++bar_num)
139 iomm_table_allocate_entry(dev, bar_num);
143 * Log error information to system console.
144 * Filter out the device not there errors.
145 * PCI: EADs Connect Failed 0x18.58.10 Rc: 0x00xx
146 * PCI: Read Vendor Failed 0x18.58.10 Rc: 0x00xx
147 * PCI: Connect Bus Unit Failed 0x18.58.10 Rc: 0x00xx
149 static void pci_Log_Error(char *Error_Text, int Bus, int SubBus,
150 int AgentId, int HvRc)
154 printk(KERN_ERR "PCI: %s Failed: 0x%02X.%02X.%02X Rc: 0x%04X",
155 Error_Text, Bus, SubBus, AgentId, HvRc);
159 * iSeries_pci_final_fixup(void)
161 void __init iSeries_pci_final_fixup(void)
163 struct pci_dev *pdev = NULL;
164 struct device_node *node;
167 /* Fix up at the device node and pci_dev relationship */
168 mf_display_src(0xC9000100);
170 printk("pcibios_final_fixup\n");
171 for_each_pci_dev(pdev) {
172 node = find_Device_Node(pdev->bus->number, pdev->devfn);
173 printk("pci dev %p (%x.%x), node %p\n", pdev,
174 pdev->bus->number, pdev->devfn, node);
177 struct pci_dn *pdn = PCI_DN(node);
180 agent = get_property(node, "linux,agent-id", NULL);
181 if ((pdn != NULL) && (agent != NULL)) {
182 u8 irq = iSeries_allocate_IRQ(pdn->busno, 0,
186 err = HvCallXm_connectBusUnit(pdn->busno, pdn->bussubno,
189 pci_Log_Error("Connect Bus Unit",
190 pdn->busno, pdn->bussubno, *agent, err);
192 err = HvCallPci_configStore8(pdn->busno, pdn->bussubno,
197 pci_Log_Error("PciCfgStore Irq Failed!",
198 pdn->busno, pdn->bussubno, *agent, err);
205 pdev->sysdata = (void *)node;
206 PCI_DN(node)->pcidev = pdev;
207 allocate_device_bars(pdev);
208 iSeries_Device_Information(pdev, DeviceCount);
209 iommu_devnode_init_iSeries(pdev, node);
211 printk("PCI: Device Tree not found for 0x%016lX\n",
212 (unsigned long)pdev);
214 iSeries_activate_IRQs();
215 mf_display_src(0xC9000200);
219 * Look down the chain to find the matching Device Device
221 static struct device_node *find_Device_Node(int bus, int devfn)
223 struct device_node *node;
225 for (node = NULL; (node = of_find_all_nodes(node)); ) {
226 struct pci_dn *pdn = PCI_DN(node);
228 if (pdn && (bus == pdn->busno) && (devfn == pdn->devfn))
236 * Returns the device node for the passed pci_dev
237 * Sanity Check Node PciDev to passed pci_dev
238 * If none is found, returns a NULL which the client must handle.
240 static struct device_node *get_Device_Node(struct pci_dev *pdev)
242 struct device_node *node;
244 node = pdev->sysdata;
245 if (node == NULL || PCI_DN(node)->pcidev != pdev)
246 node = find_Device_Node(pdev->bus->number, pdev->devfn);
252 * Config space read and write functions.
253 * For now at least, we look for the device node for the bus and devfn
254 * that we are asked to access. It may be possible to translate the devfn
255 * to a subbus and deviceid more directly.
257 static u64 hv_cfg_read_func[4] = {
258 HvCallPciConfigLoad8, HvCallPciConfigLoad16,
259 HvCallPciConfigLoad32, HvCallPciConfigLoad32
262 static u64 hv_cfg_write_func[4] = {
263 HvCallPciConfigStore8, HvCallPciConfigStore16,
264 HvCallPciConfigStore32, HvCallPciConfigStore32
268 * Read PCI config space
270 static int iSeries_pci_read_config(struct pci_bus *bus, unsigned int devfn,
271 int offset, int size, u32 *val)
273 struct device_node *node = find_Device_Node(bus->number, devfn);
275 struct HvCallPci_LoadReturn ret;
278 return PCIBIOS_DEVICE_NOT_FOUND;
281 return PCIBIOS_BAD_REGISTER_NUMBER;
284 fn = hv_cfg_read_func[(size - 1) & 3];
285 HvCall3Ret16(fn, &ret, iseries_ds_addr(node), offset, 0);
289 return PCIBIOS_DEVICE_NOT_FOUND; /* or something */
297 * Write PCI config space
300 static int iSeries_pci_write_config(struct pci_bus *bus, unsigned int devfn,
301 int offset, int size, u32 val)
303 struct device_node *node = find_Device_Node(bus->number, devfn);
308 return PCIBIOS_DEVICE_NOT_FOUND;
310 return PCIBIOS_BAD_REGISTER_NUMBER;
312 fn = hv_cfg_write_func[(size - 1) & 3];
313 ret = HvCall4(fn, iseries_ds_addr(node), offset, val, 0);
316 return PCIBIOS_DEVICE_NOT_FOUND;
321 static struct pci_ops iSeries_pci_ops = {
322 .read = iSeries_pci_read_config,
323 .write = iSeries_pci_write_config
328 * -> On Failure, print and log information.
329 * Increment Retry Count, if exceeds max, panic partition.
331 * PCI: Device 23.90 ReadL I/O Error( 0): 0x1234
332 * PCI: Device 23.90 ReadL Retry( 1)
333 * PCI: Device 23.90 ReadL Retry Successful(1)
335 static int CheckReturnCode(char *TextHdr, struct device_node *DevNode,
339 struct pci_dn *pdn = PCI_DN(DevNode);
342 printk("PCI: %s: Device 0x%04X:%02X I/O Error(%2d): 0x%04X\n",
343 TextHdr, pdn->busno, pdn->devfn,
346 * Bump the retry and check for retry count exceeded.
347 * If, Exceeded, panic the system.
349 if (((*retry) > Pci_Retry_Max) &&
350 (Pci_Error_Flag > 0)) {
351 mf_display_src(0xB6000103);
353 panic("PCI: Hardware I/O Error, SRC B6000103, "
354 "Automatic Reboot Disabled.\n");
356 return -1; /* Retry Try */
362 * Translate the I/O Address into a device node, bar, and bar offset.
363 * Note: Make sure the passed variable end up on the stack to avoid
364 * the exposure of being device global.
366 static inline struct device_node *xlate_iomm_address(
367 const volatile void __iomem *IoAddress,
368 u64 *dsaptr, u64 *BarOffsetPtr)
370 unsigned long OrigIoAddr;
371 unsigned long BaseIoAddr;
372 unsigned long TableIndex;
373 struct device_node *DevNode;
375 OrigIoAddr = (unsigned long __force)IoAddress;
376 if ((OrigIoAddr < BASE_IO_MEMORY) || (OrigIoAddr >= max_io_memory))
378 BaseIoAddr = OrigIoAddr - BASE_IO_MEMORY;
379 TableIndex = BaseIoAddr / IOMM_TABLE_ENTRY_SIZE;
380 DevNode = iomm_table[TableIndex];
382 if (DevNode != NULL) {
383 int barnum = iobar_table[TableIndex];
384 *dsaptr = iseries_ds_addr(DevNode) | (barnum << 24);
385 *BarOffsetPtr = BaseIoAddr % IOMM_TABLE_ENTRY_SIZE;
387 panic("PCI: Invalid PCI IoAddress detected!\n");
392 * Read MM I/O Instructions for the iSeries
393 * On MM I/O error, all ones are returned and iSeries_pci_IoError is cal
394 * else, data is returned in Big Endian format.
396 static u8 iSeries_Read_Byte(const volatile void __iomem *IoAddress)
401 struct HvCallPci_LoadReturn ret;
402 struct device_node *DevNode =
403 xlate_iomm_address(IoAddress, &dsa, &BarOffset);
405 if (DevNode == NULL) {
406 static unsigned long last_jiffies;
407 static int num_printed;
409 if ((jiffies - last_jiffies) > 60 * HZ) {
410 last_jiffies = jiffies;
413 if (num_printed++ < 10)
414 printk(KERN_ERR "iSeries_Read_Byte: invalid access at IO address %p\n",
419 HvCall3Ret16(HvCallPciBarLoad8, &ret, dsa, BarOffset, 0);
420 } while (CheckReturnCode("RDB", DevNode, &retry, ret.rc) != 0);
425 static u16 iSeries_Read_Word(const volatile void __iomem *IoAddress)
430 struct HvCallPci_LoadReturn ret;
431 struct device_node *DevNode =
432 xlate_iomm_address(IoAddress, &dsa, &BarOffset);
434 if (DevNode == NULL) {
435 static unsigned long last_jiffies;
436 static int num_printed;
438 if ((jiffies - last_jiffies) > 60 * HZ) {
439 last_jiffies = jiffies;
442 if (num_printed++ < 10)
443 printk(KERN_ERR "iSeries_Read_Word: invalid access at IO address %p\n",
448 HvCall3Ret16(HvCallPciBarLoad16, &ret, dsa,
450 } while (CheckReturnCode("RDW", DevNode, &retry, ret.rc) != 0);
455 static u32 iSeries_Read_Long(const volatile void __iomem *IoAddress)
460 struct HvCallPci_LoadReturn ret;
461 struct device_node *DevNode =
462 xlate_iomm_address(IoAddress, &dsa, &BarOffset);
464 if (DevNode == NULL) {
465 static unsigned long last_jiffies;
466 static int num_printed;
468 if ((jiffies - last_jiffies) > 60 * HZ) {
469 last_jiffies = jiffies;
472 if (num_printed++ < 10)
473 printk(KERN_ERR "iSeries_Read_Long: invalid access at IO address %p\n",
478 HvCall3Ret16(HvCallPciBarLoad32, &ret, dsa,
480 } while (CheckReturnCode("RDL", DevNode, &retry, ret.rc) != 0);
486 * Write MM I/O Instructions for the iSeries
489 static void iSeries_Write_Byte(u8 data, volatile void __iomem *IoAddress)
495 struct device_node *DevNode =
496 xlate_iomm_address(IoAddress, &dsa, &BarOffset);
498 if (DevNode == NULL) {
499 static unsigned long last_jiffies;
500 static int num_printed;
502 if ((jiffies - last_jiffies) > 60 * HZ) {
503 last_jiffies = jiffies;
506 if (num_printed++ < 10)
507 printk(KERN_ERR "iSeries_Write_Byte: invalid access at IO address %p\n", IoAddress);
511 rc = HvCall4(HvCallPciBarStore8, dsa, BarOffset, data, 0);
512 } while (CheckReturnCode("WWB", DevNode, &retry, rc) != 0);
515 static void iSeries_Write_Word(u16 data, volatile void __iomem *IoAddress)
521 struct device_node *DevNode =
522 xlate_iomm_address(IoAddress, &dsa, &BarOffset);
524 if (DevNode == NULL) {
525 static unsigned long last_jiffies;
526 static int num_printed;
528 if ((jiffies - last_jiffies) > 60 * HZ) {
529 last_jiffies = jiffies;
532 if (num_printed++ < 10)
533 printk(KERN_ERR "iSeries_Write_Word: invalid access at IO address %p\n",
538 rc = HvCall4(HvCallPciBarStore16, dsa, BarOffset, data, 0);
539 } while (CheckReturnCode("WWW", DevNode, &retry, rc) != 0);
542 static void iSeries_Write_Long(u32 data, volatile void __iomem *IoAddress)
548 struct device_node *DevNode =
549 xlate_iomm_address(IoAddress, &dsa, &BarOffset);
551 if (DevNode == NULL) {
552 static unsigned long last_jiffies;
553 static int num_printed;
555 if ((jiffies - last_jiffies) > 60 * HZ) {
556 last_jiffies = jiffies;
559 if (num_printed++ < 10)
560 printk(KERN_ERR "iSeries_Write_Long: invalid access at IO address %p\n",
565 rc = HvCall4(HvCallPciBarStore32, dsa, BarOffset, data, 0);
566 } while (CheckReturnCode("WWL", DevNode, &retry, rc) != 0);
569 static u8 iseries_readb(const volatile void __iomem *addr)
571 return iSeries_Read_Byte(addr);
574 static u16 iseries_readw(const volatile void __iomem *addr)
576 return le16_to_cpu(iSeries_Read_Word(addr));
579 static u32 iseries_readl(const volatile void __iomem *addr)
581 return le32_to_cpu(iSeries_Read_Long(addr));
584 static u16 iseries_readw_be(const volatile void __iomem *addr)
586 return iSeries_Read_Word(addr);
589 static u32 iseries_readl_be(const volatile void __iomem *addr)
591 return iSeries_Read_Long(addr);
594 static void iseries_writeb(u8 data, volatile void __iomem *addr)
596 iSeries_Write_Byte(data, addr);
599 static void iseries_writew(u16 data, volatile void __iomem *addr)
601 iSeries_Write_Word(cpu_to_le16(data), addr);
604 static void iseries_writel(u32 data, volatile void __iomem *addr)
606 iSeries_Write_Long(cpu_to_le32(data), addr);
609 static void iseries_writew_be(u16 data, volatile void __iomem *addr)
611 iSeries_Write_Word(data, addr);
614 static void iseries_writel_be(u32 data, volatile void __iomem *addr)
616 iSeries_Write_Long(data, addr);
619 static void iseries_readsb(const volatile void __iomem *addr, void *buf,
624 *(dst++) = iSeries_Read_Byte(addr);
627 static void iseries_readsw(const volatile void __iomem *addr, void *buf,
632 *(dst++) = iSeries_Read_Word(addr);
635 static void iseries_readsl(const volatile void __iomem *addr, void *buf,
640 *(dst++) = iSeries_Read_Long(addr);
643 static void iseries_writesb(volatile void __iomem *addr, const void *buf,
648 iSeries_Write_Byte(*(src++), addr);
651 static void iseries_writesw(volatile void __iomem *addr, const void *buf,
654 const u16 *src = buf;
656 iSeries_Write_Word(*(src++), addr);
659 static void iseries_writesl(volatile void __iomem *addr, const void *buf,
662 const u32 *src = buf;
664 iSeries_Write_Long(*(src++), addr);
667 static void iseries_memset_io(volatile void __iomem *addr, int c,
670 volatile char __iomem *d = addr;
673 iSeries_Write_Byte(c, d++);
676 static void iseries_memcpy_fromio(void *dest, const volatile void __iomem *src,
680 const volatile char __iomem *s = src;
683 *d++ = iSeries_Read_Byte(s++);
686 static void iseries_memcpy_toio(volatile void __iomem *dest, const void *src,
690 volatile char __iomem *d = dest;
693 iSeries_Write_Byte(*s++, d++);
696 /* We only set MMIO ops. The default PIO ops will be default
697 * to the MMIO ops + pci_io_base which is 0 on iSeries as
698 * expected so both should work.
700 * Note that we don't implement the readq/writeq versions as
701 * I don't know of an HV call for doing so. Thus, the default
702 * operation will be used instead, which will fault a the value
703 * return by iSeries for MMIO addresses always hits a non mapped
704 * area. This is as good as the BUG() we used to have there.
706 static struct ppc_pci_io __initdata iseries_pci_io = {
707 .readb = iseries_readb,
708 .readw = iseries_readw,
709 .readl = iseries_readl,
710 .readw_be = iseries_readw_be,
711 .readl_be = iseries_readl_be,
712 .writeb = iseries_writeb,
713 .writew = iseries_writew,
714 .writel = iseries_writel,
715 .writew_be = iseries_writew_be,
716 .writel_be = iseries_writel_be,
717 .readsb = iseries_readsb,
718 .readsw = iseries_readsw,
719 .readsl = iseries_readsl,
720 .writesb = iseries_writesb,
721 .writesw = iseries_writesw,
722 .writesl = iseries_writesl,
723 .memset_io = iseries_memset_io,
724 .memcpy_fromio = iseries_memcpy_fromio,
725 .memcpy_toio = iseries_memcpy_toio,
729 * iSeries_pcibios_init
732 * This function checks for all possible system PCI host bridges that connect
733 * PCI buses. The system hypervisor is queried as to the guest partition
734 * ownership status. A pci_controller is built for any bus which is partially
735 * owned or fully owned by this guest partition.
737 void __init iSeries_pcibios_init(void)
739 struct pci_controller *phb;
740 struct device_node *root = of_find_node_by_path("/");
741 struct device_node *node = NULL;
743 /* Install IO hooks */
744 ppc_pci_io = iseries_pci_io;
747 printk(KERN_CRIT "iSeries_pcibios_init: can't find root "
751 while ((node = of_get_next_child(root, node)) != NULL) {
755 if ((node->type == NULL) || (strcmp(node->type, "pci") != 0))
758 busp = get_property(node, "bus-range", NULL);
762 printk("bus %d appears to exist\n", bus);
763 phb = pcibios_alloc_controller(node);
767 phb->pci_mem_offset = phb->local_number = bus;
768 phb->first_busno = bus;
769 phb->last_busno = bus;
770 phb->ops = &iSeries_pci_ops;