diff options
Diffstat (limited to 'drivers/pci/hotplug/ibmphp_pci.c')
| -rw-r--r-- | drivers/pci/hotplug/ibmphp_pci.c | 1691 |
1 files changed, 1691 insertions, 0 deletions
diff --git a/drivers/pci/hotplug/ibmphp_pci.c b/drivers/pci/hotplug/ibmphp_pci.c new file mode 100644 index 000000000..e22d023f9 --- /dev/null +++ b/drivers/pci/hotplug/ibmphp_pci.c @@ -0,0 +1,1691 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * IBM Hot Plug Controller Driver + * + * Written By: Irene Zubarev, IBM Corporation + * + * Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com) + * Copyright (C) 2001,2002 IBM Corp. + * + * All rights reserved. + * + * Send feedback to <gregkh@us.ibm.com> + * + */ + +#include <linux/module.h> +#include <linux/slab.h> +#include <linux/pci.h> +#include <linux/list.h> +#include "ibmphp.h" + + +static int configure_device(struct pci_func *); +static int configure_bridge(struct pci_func **, u8); +static struct res_needed *scan_behind_bridge(struct pci_func *, u8); +static int add_new_bus(struct bus_node *, struct resource_node *, struct resource_node *, struct resource_node *, u8); +static u8 find_sec_number(u8 primary_busno, u8 slotno); + +/* + * NOTE..... If BIOS doesn't provide default routing, we assign: + * 9 for SCSI, 10 for LAN adapters, and 11 for everything else. + * If adapter is bridged, then we assign 11 to it and devices behind it. + * We also assign the same irq numbers for multi function devices. + * These are PIC mode, so shouldn't matter n.e.ways (hopefully) + */ +static void assign_alt_irq(struct pci_func *cur_func, u8 class_code) +{ + int j; + for (j = 0; j < 4; j++) { + if (cur_func->irq[j] == 0xff) { + switch (class_code) { + case PCI_BASE_CLASS_STORAGE: + cur_func->irq[j] = SCSI_IRQ; + break; + case PCI_BASE_CLASS_NETWORK: + cur_func->irq[j] = LAN_IRQ; + break; + default: + cur_func->irq[j] = OTHER_IRQ; + break; + } + } + } +} + +/* + * Configures the device to be added (will allocate needed resources if it + * can), the device can be a bridge or a regular pci device, can also be + * multi-functional + * + * Input: function to be added + * + * TO DO: The error case with Multifunction device or multi function bridge, + * if there is an error, will need to go through all previous functions and + * unconfigure....or can add some code into unconfigure_card.... + */ +int ibmphp_configure_card(struct pci_func *func, u8 slotno) +{ + u16 vendor_id; + u32 class; + u8 class_code; + u8 hdr_type, device, sec_number; + u8 function; + struct pci_func *newfunc; /* for multi devices */ + struct pci_func *cur_func, *prev_func; + int rc, i, j; + int cleanup_count; + u8 flag; + u8 valid_device = 0x00; /* to see if we are able to read from card any device info at all */ + + debug("inside configure_card, func->busno = %x\n", func->busno); + + device = func->device; + cur_func = func; + + /* We only get bus and device from IRQ routing table. So at this point, + * func->busno is correct, and func->device contains only device (at the 5 + * highest bits) + */ + + /* For every function on the card */ + for (function = 0x00; function < 0x08; function++) { + unsigned int devfn = PCI_DEVFN(device, function); + ibmphp_pci_bus->number = cur_func->busno; + + cur_func->function = function; + + debug("inside the loop, cur_func->busno = %x, cur_func->device = %x, cur_func->function = %x\n", + cur_func->busno, cur_func->device, cur_func->function); + + pci_bus_read_config_word(ibmphp_pci_bus, devfn, PCI_VENDOR_ID, &vendor_id); + + debug("vendor_id is %x\n", vendor_id); + if (vendor_id != PCI_VENDOR_ID_NOTVALID) { + /* found correct device!!! */ + debug("found valid device, vendor_id = %x\n", vendor_id); + + ++valid_device; + + /* header: x x x x x x x x + * | |___________|=> 1=PPB bridge, 0=normal device, 2=CardBus Bridge + * |_=> 0 = single function device, 1 = multi-function device + */ + + pci_bus_read_config_byte(ibmphp_pci_bus, devfn, PCI_HEADER_TYPE, &hdr_type); + pci_bus_read_config_dword(ibmphp_pci_bus, devfn, PCI_CLASS_REVISION, &class); + + class_code = class >> 24; + debug("hrd_type = %x, class = %x, class_code %x\n", hdr_type, class, class_code); + class >>= 8; /* to take revision out, class = class.subclass.prog i/f */ + if (class == PCI_CLASS_NOT_DEFINED_VGA) { + err("The device %x is VGA compatible and as is not supported for hot plugging. " + "Please choose another device.\n", cur_func->device); + return -ENODEV; + } else if (class == PCI_CLASS_DISPLAY_VGA) { + err("The device %x is not supported for hot plugging. Please choose another device.\n", + cur_func->device); + return -ENODEV; + } + switch (hdr_type) { + case PCI_HEADER_TYPE_NORMAL: + debug("single device case.... vendor id = %x, hdr_type = %x, class = %x\n", vendor_id, hdr_type, class); + assign_alt_irq(cur_func, class_code); + rc = configure_device(cur_func); + if (rc < 0) { + /* We need to do this in case some other BARs were properly inserted */ + err("was not able to configure devfunc %x on bus %x.\n", + cur_func->device, cur_func->busno); + cleanup_count = 6; + goto error; + } + cur_func->next = NULL; + function = 0x8; + break; + case PCI_HEADER_TYPE_MULTIDEVICE: + assign_alt_irq(cur_func, class_code); + rc = configure_device(cur_func); + if (rc < 0) { + /* We need to do this in case some other BARs were properly inserted */ + err("was not able to configure devfunc %x on bus %x...bailing out\n", + cur_func->device, cur_func->busno); + cleanup_count = 6; + goto error; + } + newfunc = kzalloc(sizeof(*newfunc), GFP_KERNEL); + if (!newfunc) + return -ENOMEM; + + newfunc->busno = cur_func->busno; + newfunc->device = device; + cur_func->next = newfunc; + cur_func = newfunc; + for (j = 0; j < 4; j++) + newfunc->irq[j] = cur_func->irq[j]; + break; + case PCI_HEADER_TYPE_MULTIBRIDGE: + class >>= 8; + if (class != PCI_CLASS_BRIDGE_PCI) { + err("This %x is not PCI-to-PCI bridge, and as is not supported for hot-plugging. Please insert another card.\n", + cur_func->device); + return -ENODEV; + } + assign_alt_irq(cur_func, class_code); + rc = configure_bridge(&cur_func, slotno); + if (rc == -ENODEV) { + err("You chose to insert Single Bridge, or nested bridges, this is not supported...\n"); + err("Bus %x, devfunc %x\n", cur_func->busno, cur_func->device); + return rc; + } + if (rc) { + /* We need to do this in case some other BARs were properly inserted */ + err("was not able to hot-add PPB properly.\n"); + func->bus = 1; /* To indicate to the unconfigure function that this is a PPB */ + cleanup_count = 2; + goto error; + } + + pci_bus_read_config_byte(ibmphp_pci_bus, devfn, PCI_SECONDARY_BUS, &sec_number); + flag = 0; + for (i = 0; i < 32; i++) { + if (func->devices[i]) { + newfunc = kzalloc(sizeof(*newfunc), GFP_KERNEL); + if (!newfunc) + return -ENOMEM; + + newfunc->busno = sec_number; + newfunc->device = (u8) i; + for (j = 0; j < 4; j++) + newfunc->irq[j] = cur_func->irq[j]; + + if (flag) { + for (prev_func = cur_func; prev_func->next; prev_func = prev_func->next) ; + prev_func->next = newfunc; + } else + cur_func->next = newfunc; + + rc = ibmphp_configure_card(newfunc, slotno); + /* This could only happen if kmalloc failed */ + if (rc) { + /* We need to do this in case bridge itself got configured properly, but devices behind it failed */ + func->bus = 1; /* To indicate to the unconfigure function that this is a PPB */ + cleanup_count = 2; + goto error; + } + flag = 1; + } + } + + newfunc = kzalloc(sizeof(*newfunc), GFP_KERNEL); + if (!newfunc) + return -ENOMEM; + + newfunc->busno = cur_func->busno; + newfunc->device = device; + for (j = 0; j < 4; j++) + newfunc->irq[j] = cur_func->irq[j]; + for (prev_func = cur_func; prev_func->next; prev_func = prev_func->next); + prev_func->next = newfunc; + cur_func = newfunc; + break; + case PCI_HEADER_TYPE_BRIDGE: + class >>= 8; + debug("class now is %x\n", class); + if (class != PCI_CLASS_BRIDGE_PCI) { + err("This %x is not PCI-to-PCI bridge, and as is not supported for hot-plugging. Please insert another card.\n", + cur_func->device); + return -ENODEV; + } + + assign_alt_irq(cur_func, class_code); + + debug("cur_func->busno b4 configure_bridge is %x\n", cur_func->busno); + rc = configure_bridge(&cur_func, slotno); + if (rc == -ENODEV) { + err("You chose to insert Single Bridge, or nested bridges, this is not supported...\n"); + err("Bus %x, devfunc %x\n", cur_func->busno, cur_func->device); + return rc; + } + if (rc) { + /* We need to do this in case some other BARs were properly inserted */ + func->bus = 1; /* To indicate to the unconfigure function that this is a PPB */ + err("was not able to hot-add PPB properly.\n"); + cleanup_count = 2; + goto error; + } + debug("cur_func->busno = %x, device = %x, function = %x\n", + cur_func->busno, device, function); + pci_bus_read_config_byte(ibmphp_pci_bus, devfn, PCI_SECONDARY_BUS, &sec_number); + debug("after configuring bridge..., sec_number = %x\n", sec_number); + flag = 0; + for (i = 0; i < 32; i++) { + if (func->devices[i]) { + debug("inside for loop, device is %x\n", i); + newfunc = kzalloc(sizeof(*newfunc), GFP_KERNEL); + if (!newfunc) + return -ENOMEM; + + newfunc->busno = sec_number; + newfunc->device = (u8) i; + for (j = 0; j < 4; j++) + newfunc->irq[j] = cur_func->irq[j]; + + if (flag) { + for (prev_func = cur_func; prev_func->next; prev_func = prev_func->next); + prev_func->next = newfunc; + } else + cur_func->next = newfunc; + + rc = ibmphp_configure_card(newfunc, slotno); + + /* Again, this case should not happen... For complete paranoia, will need to call remove_bus */ + if (rc) { + /* We need to do this in case some other BARs were properly inserted */ + func->bus = 1; /* To indicate to the unconfigure function that this is a PPB */ + cleanup_count = 2; + goto error; + } + flag = 1; + } + } + + function = 0x8; + break; + default: + err("MAJOR PROBLEM!!!!, header type not supported? %x\n", hdr_type); + return -ENXIO; + break; + } /* end of switch */ + } /* end of valid device */ + } /* end of for */ + + if (!valid_device) { + err("Cannot find any valid devices on the card. Or unable to read from card.\n"); + return -ENODEV; + } + + return 0; + +error: + for (i = 0; i < cleanup_count; i++) { + if (cur_func->io[i]) { + ibmphp_remove_resource(cur_func->io[i]); + cur_func->io[i] = NULL; + } else if (cur_func->pfmem[i]) { + ibmphp_remove_resource(cur_func->pfmem[i]); + cur_func->pfmem[i] = NULL; + } else if (cur_func->mem[i]) { + ibmphp_remove_resource(cur_func->mem[i]); + cur_func->mem[i] = NULL; + } + } + return rc; +} + +/* + * This function configures the pci BARs of a single device. + * Input: pointer to the pci_func + * Output: configured PCI, 0, or error + */ +static int configure_device(struct pci_func *func) +{ + u32 bar[6]; + u32 address[] = { + PCI_BASE_ADDRESS_0, + PCI_BASE_ADDRESS_1, + PCI_BASE_ADDRESS_2, + PCI_BASE_ADDRESS_3, + PCI_BASE_ADDRESS_4, + PCI_BASE_ADDRESS_5, + 0 + }; + u8 irq; + int count; + int len[6]; + struct resource_node *io[6]; + struct resource_node *mem[6]; + struct resource_node *mem_tmp; + struct resource_node *pfmem[6]; + unsigned int devfn; + + debug("%s - inside\n", __func__); + + devfn = PCI_DEVFN(func->device, func->function); + ibmphp_pci_bus->number = func->busno; + + for (count = 0; address[count]; count++) { /* for 6 BARs */ + + /* not sure if i need this. per scott, said maybe need * something like this + if devices don't adhere 100% to the spec, so don't want to write + to the reserved bits + + pcibios_read_config_byte(cur_func->busno, cur_func->device, + PCI_BASE_ADDRESS_0 + 4 * count, &tmp); + if (tmp & 0x01) // IO + pcibios_write_config_dword(cur_func->busno, cur_func->device, + PCI_BASE_ADDRESS_0 + 4 * count, 0xFFFFFFFD); + else // Memory + pcibios_write_config_dword(cur_func->busno, cur_func->device, + PCI_BASE_ADDRESS_0 + 4 * count, 0xFFFFFFFF); + */ + pci_bus_write_config_dword(ibmphp_pci_bus, devfn, address[count], 0xFFFFFFFF); + pci_bus_read_config_dword(ibmphp_pci_bus, devfn, address[count], &bar[count]); + + if (!bar[count]) /* This BAR is not implemented */ + continue; + + debug("Device %x BAR %d wants %x\n", func->device, count, bar[count]); + + if (bar[count] & PCI_BASE_ADDRESS_SPACE_IO) { + /* This is IO */ + debug("inside IO SPACE\n"); + + len[count] = bar[count] & 0xFFFFFFFC; + len[count] = ~len[count] + 1; + + debug("len[count] in IO %x, count %d\n", len[count], count); + + io[count] = kzalloc(sizeof(struct resource_node), GFP_KERNEL); + + if (!io[count]) + return -ENOMEM; + + io[count]->type = IO; + io[count]->busno = func->busno; + io[count]->devfunc = PCI_DEVFN(func->device, func->function); + io[count]->len = len[count]; + if (ibmphp_check_resource(io[count], 0) == 0) { + ibmphp_add_resource(io[count]); + func->io[count] = io[count]; + } else { + err("cannot allocate requested io for bus %x device %x function %x len %x\n", + func->busno, func->device, func->function, len[count]); + kfree(io[count]); + return -EIO; + } + pci_bus_write_config_dword(ibmphp_pci_bus, devfn, address[count], func->io[count]->start); + + /* _______________This is for debugging purposes only_____________________ */ + debug("b4 writing, the IO address is %x\n", func->io[count]->start); + pci_bus_read_config_dword(ibmphp_pci_bus, devfn, address[count], &bar[count]); + debug("after writing.... the start address is %x\n", bar[count]); + /* _________________________________________________________________________*/ + + } else { + /* This is Memory */ + if (bar[count] & PCI_BASE_ADDRESS_MEM_PREFETCH) { + /* pfmem */ + debug("PFMEM SPACE\n"); + + len[count] = bar[count] & 0xFFFFFFF0; + len[count] = ~len[count] + 1; + + debug("len[count] in PFMEM %x, count %d\n", len[count], count); + + pfmem[count] = kzalloc(sizeof(struct resource_node), GFP_KERNEL); + if (!pfmem[count]) + return -ENOMEM; + + pfmem[count]->type = PFMEM; + pfmem[count]->busno = func->busno; + pfmem[count]->devfunc = PCI_DEVFN(func->device, + func->function); + pfmem[count]->len = len[count]; + pfmem[count]->fromMem = 0; + if (ibmphp_check_resource(pfmem[count], 0) == 0) { + ibmphp_add_resource(pfmem[count]); + func->pfmem[count] = pfmem[count]; + } else { + mem_tmp = kzalloc(sizeof(*mem_tmp), GFP_KERNEL); + if (!mem_tmp) { + kfree(pfmem[count]); + return -ENOMEM; + } + mem_tmp->type = MEM; + mem_tmp->busno = pfmem[count]->busno; + mem_tmp->devfunc = pfmem[count]->devfunc; + mem_tmp->len = pfmem[count]->len; + debug("there's no pfmem... going into mem.\n"); + if (ibmphp_check_resource(mem_tmp, 0) == 0) { + ibmphp_add_resource(mem_tmp); + pfmem[count]->fromMem = 1; + pfmem[count]->rangeno = mem_tmp->rangeno; + pfmem[count]->start = mem_tmp->start; + pfmem[count]->end = mem_tmp->end; + ibmphp_add_pfmem_from_mem(pfmem[count]); + func->pfmem[count] = pfmem[count]; + } else { + err("cannot allocate requested pfmem for bus %x, device %x, len %x\n", + func->busno, func->device, len[count]); + kfree(mem_tmp); + kfree(pfmem[count]); + return -EIO; + } + } + + pci_bus_write_config_dword(ibmphp_pci_bus, devfn, address[count], func->pfmem[count]->start); + + /*_______________This is for debugging purposes only______________________________*/ + debug("b4 writing, start address is %x\n", func->pfmem[count]->start); + pci_bus_read_config_dword(ibmphp_pci_bus, devfn, address[count], &bar[count]); + debug("after writing, start address is %x\n", bar[count]); + /*_________________________________________________________________________________*/ + + if (bar[count] & PCI_BASE_ADDRESS_MEM_TYPE_64) { /* takes up another dword */ + debug("inside the mem 64 case, count %d\n", count); + count += 1; + /* on the 2nd dword, write all 0s, since we can't handle them n.e.ways */ + pci_bus_write_config_dword(ibmphp_pci_bus, devfn, address[count], 0x00000000); + } + } else { + /* regular memory */ + debug("REGULAR MEM SPACE\n"); + + len[count] = bar[count] & 0xFFFFFFF0; + len[count] = ~len[count] + 1; + + debug("len[count] in Mem %x, count %d\n", len[count], count); + + mem[count] = kzalloc(sizeof(struct resource_node), GFP_KERNEL); + if (!mem[count]) + return -ENOMEM; + + mem[count]->type = MEM; + mem[count]->busno = func->busno; + mem[count]->devfunc = PCI_DEVFN(func->device, + func->function); + mem[count]->len = len[count]; + if (ibmphp_check_resource(mem[count], 0) == 0) { + ibmphp_add_resource(mem[count]); + func->mem[count] = mem[count]; + } else { + err("cannot allocate requested mem for bus %x, device %x, len %x\n", + func->busno, func->device, len[count]); + kfree(mem[count]); + return -EIO; + } + pci_bus_write_config_dword(ibmphp_pci_bus, devfn, address[count], func->mem[count]->start); + /* _______________________This is for debugging purposes only _______________________*/ + debug("b4 writing, start address is %x\n", func->mem[count]->start); + pci_bus_read_config_dword(ibmphp_pci_bus, devfn, address[count], &bar[count]); + debug("after writing, the address is %x\n", bar[count]); + /* __________________________________________________________________________________*/ + + if (bar[count] & PCI_BASE_ADDRESS_MEM_TYPE_64) { + /* takes up another dword */ + debug("inside mem 64 case, reg. mem, count %d\n", count); + count += 1; + /* on the 2nd dword, write all 0s, since we can't handle them n.e.ways */ + pci_bus_write_config_dword(ibmphp_pci_bus, devfn, address[count], 0x00000000); + } + } + } /* end of mem */ + } /* end of for */ + + func->bus = 0; /* To indicate that this is not a PPB */ + pci_bus_read_config_byte(ibmphp_pci_bus, devfn, PCI_INTERRUPT_PIN, &irq); + if ((irq > 0x00) && (irq < 0x05)) + pci_bus_write_config_byte(ibmphp_pci_bus, devfn, PCI_INTERRUPT_LINE, func->irq[irq - 1]); + + pci_bus_write_config_byte(ibmphp_pci_bus, devfn, PCI_CACHE_LINE_SIZE, CACHE); + pci_bus_write_config_byte(ibmphp_pci_bus, devfn, PCI_LATENCY_TIMER, LATENCY); + + pci_bus_write_config_dword(ibmphp_pci_bus, devfn, PCI_ROM_ADDRESS, 0x00L); + pci_bus_write_config_word(ibmphp_pci_bus, devfn, PCI_COMMAND, DEVICEENABLE); + + return 0; +} + +/****************************************************************************** + * This routine configures a PCI-2-PCI bridge and the functions behind it + * Parameters: pci_func + * Returns: + ******************************************************************************/ +static int configure_bridge(struct pci_func **func_passed, u8 slotno) +{ + int count; + int i; + int rc; + u8 sec_number; + u8 io_base; + u16 pfmem_base; + u32 bar[2]; + u32 len[2]; + u8 flag_io = 0; + u8 flag_mem = 0; + u8 flag_pfmem = 0; + u8 need_io_upper = 0; + u8 need_pfmem_upper = 0; + struct res_needed *amount_needed = NULL; + struct resource_node *io = NULL; + struct resource_node *bus_io[2] = {NULL, NULL}; + struct resource_node *mem = NULL; + struct resource_node *bus_mem[2] = {NULL, NULL}; + struct resource_node *mem_tmp = NULL; + struct resource_node *pfmem = NULL; + struct resource_node *bus_pfmem[2] = {NULL, NULL}; + struct bus_node *bus; + u32 address[] = { + PCI_BASE_ADDRESS_0, + PCI_BASE_ADDRESS_1, + 0 + }; + struct pci_func *func = *func_passed; + unsigned int devfn; + u8 irq; + int retval; + + debug("%s - enter\n", __func__); + + devfn = PCI_DEVFN(func->function, func->device); + ibmphp_pci_bus->number = func->busno; + + /* Configuring necessary info for the bridge so that we could see the devices + * behind it + */ + + pci_bus_write_config_byte(ibmphp_pci_bus, devfn, PCI_PRIMARY_BUS, func->busno); + + /* _____________________For debugging purposes only __________________________ + pci_bus_config_byte(ibmphp_pci_bus, devfn, PCI_PRIMARY_BUS, &pri_number); + debug("primary # written into the bridge is %x\n", pri_number); + ___________________________________________________________________________*/ + + /* in EBDA, only get allocated 1 additional bus # per slot */ + sec_number = find_sec_number(func->busno, slotno); + if (sec_number == 0xff) { + err("cannot allocate secondary bus number for the bridged device\n"); + return -EINVAL; + } + + debug("after find_sec_number, the number we got is %x\n", sec_number); + debug("AFTER FIND_SEC_NUMBER, func->busno IS %x\n", func->busno); + + pci_bus_write_config_byte(ibmphp_pci_bus, devfn, PCI_SECONDARY_BUS, sec_number); + + /* __________________For debugging purposes only __________________________________ + pci_bus_read_config_byte(ibmphp_pci_bus, devfn, PCI_SECONDARY_BUS, &sec_number); + debug("sec_number after write/read is %x\n", sec_number); + ________________________________________________________________________________*/ + + pci_bus_write_config_byte(ibmphp_pci_bus, devfn, PCI_SUBORDINATE_BUS, sec_number); + + /* __________________For debugging purposes only ____________________________________ + pci_bus_read_config_byte(ibmphp_pci_bus, devfn, PCI_SUBORDINATE_BUS, &sec_number); + debug("subordinate number after write/read is %x\n", sec_number); + __________________________________________________________________________________*/ + + pci_bus_write_config_byte(ibmphp_pci_bus, devfn, PCI_CACHE_LINE_SIZE, CACHE); + pci_bus_write_config_byte(ibmphp_pci_bus, devfn, PCI_LATENCY_TIMER, LATENCY); + pci_bus_write_config_byte(ibmphp_pci_bus, devfn, PCI_SEC_LATENCY_TIMER, LATENCY); + + debug("func->busno is %x\n", func->busno); + debug("sec_number after writing is %x\n", sec_number); + + + /* !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! + !!!!!!!!!!!!!!!NEED TO ADD!!! FAST BACK-TO-BACK ENABLE!!!!!!!!!!!!!!!!!!!! + !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!*/ + + + /* First we need to allocate mem/io for the bridge itself in case it needs it */ + for (count = 0; address[count]; count++) { /* for 2 BARs */ + pci_bus_write_config_dword(ibmphp_pci_bus, devfn, address[count], 0xFFFFFFFF); + pci_bus_read_config_dword(ibmphp_pci_bus, devfn, address[count], &bar[count]); + + if (!bar[count]) { + /* This BAR is not implemented */ + debug("so we come here then, eh?, count = %d\n", count); + continue; + } + // tmp_bar = bar[count]; + + debug("Bar %d wants %x\n", count, bar[count]); + + if (bar[count] & PCI_BASE_ADDRESS_SPACE_IO) { + /* This is IO */ + len[count] = bar[count] & 0xFFFFFFFC; + len[count] = ~len[count] + 1; + + debug("len[count] in IO = %x\n", len[count]); + + bus_io[count] = kzalloc(sizeof(struct resource_node), GFP_KERNEL); + + if (!bus_io[count]) { + retval = -ENOMEM; + goto error; + } + bus_io[count]->type = IO; + bus_io[count]->busno = func->busno; + bus_io[count]->devfunc = PCI_DEVFN(func->device, + func->function); + bus_io[count]->len = len[count]; + if (ibmphp_check_resource(bus_io[count], 0) == 0) { + ibmphp_add_resource(bus_io[count]); + func->io[count] = bus_io[count]; + } else { + err("cannot allocate requested io for bus %x, device %x, len %x\n", + func->busno, func->device, len[count]); + kfree(bus_io[count]); + return -EIO; + } + + pci_bus_write_config_dword(ibmphp_pci_bus, devfn, address[count], func->io[count]->start); + + } else { + /* This is Memory */ + if (bar[count] & PCI_BASE_ADDRESS_MEM_PREFETCH) { + /* pfmem */ + len[count] = bar[count] & 0xFFFFFFF0; + len[count] = ~len[count] + 1; + + debug("len[count] in PFMEM = %x\n", len[count]); + + bus_pfmem[count] = kzalloc(sizeof(struct resource_node), GFP_KERNEL); + if (!bus_pfmem[count]) { + retval = -ENOMEM; + goto error; + } + bus_pfmem[count]->type = PFMEM; + bus_pfmem[count]->busno = func->busno; + bus_pfmem[count]->devfunc = PCI_DEVFN(func->device, + func->function); + bus_pfmem[count]->len = len[count]; + bus_pfmem[count]->fromMem = 0; + if (ibmphp_check_resource(bus_pfmem[count], 0) == 0) { + ibmphp_add_resource(bus_pfmem[count]); + func->pfmem[count] = bus_pfmem[count]; + } else { + mem_tmp = kzalloc(sizeof(*mem_tmp), GFP_KERNEL); + if (!mem_tmp) { + retval = -ENOMEM; + goto error; + } + mem_tmp->type = MEM; + mem_tmp->busno = bus_pfmem[count]->busno; + mem_tmp->devfunc = bus_pfmem[count]->devfunc; + mem_tmp->len = bus_pfmem[count]->len; + if (ibmphp_check_resource(mem_tmp, 0) == 0) { + ibmphp_add_resource(mem_tmp); + bus_pfmem[count]->fromMem = 1; + bus_pfmem[count]->rangeno = mem_tmp->rangeno; + ibmphp_add_pfmem_from_mem(bus_pfmem[count]); + func->pfmem[count] = bus_pfmem[count]; + } else { + err("cannot allocate requested pfmem for bus %x, device %x, len %x\n", + func->busno, func->device, len[count]); + kfree(mem_tmp); + kfree(bus_pfmem[count]); + return -EIO; + } + } + + pci_bus_write_config_dword(ibmphp_pci_bus, devfn, address[count], func->pfmem[count]->start); + + if (bar[count] & PCI_BASE_ADDRESS_MEM_TYPE_64) { + /* takes up another dword */ + count += 1; + /* on the 2nd dword, write all 0s, since we can't handle them n.e.ways */ + pci_bus_write_config_dword(ibmphp_pci_bus, devfn, address[count], 0x00000000); + + } + } else { + /* regular memory */ + len[count] = bar[count] & 0xFFFFFFF0; + len[count] = ~len[count] + 1; + + debug("len[count] in Memory is %x\n", len[count]); + + bus_mem[count] = kzalloc(sizeof(struct resource_node), GFP_KERNEL); + if (!bus_mem[count]) { + retval = -ENOMEM; + goto error; + } + bus_mem[count]->type = MEM; + bus_mem[count]->busno = func->busno; + bus_mem[count]->devfunc = PCI_DEVFN(func->device, + func->function); + bus_mem[count]->len = len[count]; + if (ibmphp_check_resource(bus_mem[count], 0) == 0) { + ibmphp_add_resource(bus_mem[count]); + func->mem[count] = bus_mem[count]; + } else { + err("cannot allocate requested mem for bus %x, device %x, len %x\n", + func->busno, func->device, len[count]); + kfree(bus_mem[count]); + return -EIO; + } + + pci_bus_write_config_dword(ibmphp_pci_bus, devfn, address[count], func->mem[count]->start); + + if (bar[count] & PCI_BASE_ADDRESS_MEM_TYPE_64) { + /* takes up another dword */ + count += 1; + /* on the 2nd dword, write all 0s, since we can't handle them n.e.ways */ + pci_bus_write_config_dword(ibmphp_pci_bus, devfn, address[count], 0x00000000); + + } + } + } /* end of mem */ + } /* end of for */ + + /* Now need to see how much space the devices behind the bridge needed */ + amount_needed = scan_behind_bridge(func, sec_number); + if (amount_needed == NULL) + return -ENOMEM; + + ibmphp_pci_bus->number = func->busno; + debug("after coming back from scan_behind_bridge\n"); + debug("amount_needed->not_correct = %x\n", amount_needed->not_correct); + debug("amount_needed->io = %x\n", amount_needed->io); + debug("amount_needed->mem = %x\n", amount_needed->mem); + debug("amount_needed->pfmem = %x\n", amount_needed->pfmem); + + if (amount_needed->not_correct) { + debug("amount_needed is not correct\n"); + for (count = 0; address[count]; count++) { + /* for 2 BARs */ + if (bus_io[count]) { + ibmphp_remove_resource(bus_io[count]); + func->io[count] = NULL; + } else if (bus_pfmem[count]) { + ibmphp_remove_resource(bus_pfmem[count]); + func->pfmem[count] = NULL; + } else if (bus_mem[count]) { + ibmphp_remove_resource(bus_mem[count]); + func->mem[count] = NULL; + } + } + kfree(amount_needed); + return -ENODEV; + } + + if (!amount_needed->io) { + debug("it doesn't want IO?\n"); + flag_io = 1; + } else { + debug("it wants %x IO behind the bridge\n", amount_needed->io); + io = kzalloc(sizeof(*io), GFP_KERNEL); + + if (!io) { + retval = -ENOMEM; + goto error; + } + io->type = IO; + io->busno = func->busno; + io->devfunc = PCI_DEVFN(func->device, func->function); + io->len = amount_needed->io; + if (ibmphp_check_resource(io, 1) == 0) { + debug("were we able to add io\n"); + ibmphp_add_resource(io); + flag_io = 1; + } + } + + if (!amount_needed->mem) { + debug("it doesn't want n.e.memory?\n"); + flag_mem = 1; + } else { + debug("it wants %x memory behind the bridge\n", amount_needed->mem); + mem = kzalloc(sizeof(*mem), GFP_KERNEL); + if (!mem) { + retval = -ENOMEM; + goto error; + } + mem->type = MEM; + mem->busno = func->busno; + mem->devfunc = PCI_DEVFN(func->device, func->function); + mem->len = amount_needed->mem; + if (ibmphp_check_resource(mem, 1) == 0) { + ibmphp_add_resource(mem); + flag_mem = 1; + debug("were we able to add mem\n"); + } + } + + if (!amount_needed->pfmem) { + debug("it doesn't want n.e.pfmem mem?\n"); + flag_pfmem = 1; + } else { + debug("it wants %x pfmemory behind the bridge\n", amount_needed->pfmem); + pfmem = kzalloc(sizeof(*pfmem), GFP_KERNEL); + if (!pfmem) { + retval = -ENOMEM; + goto error; + } + pfmem->type = PFMEM; + pfmem->busno = func->busno; + pfmem->devfunc = PCI_DEVFN(func->device, func->function); + pfmem->len = amount_needed->pfmem; + pfmem->fromMem = 0; + if (ibmphp_check_resource(pfmem, 1) == 0) { + ibmphp_add_resource(pfmem); + flag_pfmem = 1; + } else { + mem_tmp = kzalloc(sizeof(*mem_tmp), GFP_KERNEL); + if (!mem_tmp) { + retval = -ENOMEM; + goto error; + } + mem_tmp->type = MEM; + mem_tmp->busno = pfmem->busno; + mem_tmp->devfunc = pfmem->devfunc; + mem_tmp->len = pfmem->len; + if (ibmphp_check_resource(mem_tmp, 1) == 0) { + ibmphp_add_resource(mem_tmp); + pfmem->fromMem = 1; + pfmem->rangeno = mem_tmp->rangeno; + ibmphp_add_pfmem_from_mem(pfmem); + flag_pfmem = 1; + } + } + } + + debug("b4 if (flag_io && flag_mem && flag_pfmem)\n"); + debug("flag_io = %x, flag_mem = %x, flag_pfmem = %x\n", flag_io, flag_mem, flag_pfmem); + + if (flag_io && flag_mem && flag_pfmem) { + /* If on bootup, there was a bridged card in this slot, + * then card was removed and ibmphp got unloaded and loaded + * back again, there's no way for us to remove the bus + * struct, so no need to kmalloc, can use existing node + */ + bus = ibmphp_find_res_bus(sec_number); + if (!bus) { + bus = kzalloc(sizeof(*bus), GFP_KERNEL); + if (!bus) { + retval = -ENOMEM; + goto error; + } + bus->busno = sec_number; + debug("b4 adding new bus\n"); + rc = add_new_bus(bus, io, mem, pfmem, func->busno); + } else if (!(bus->rangeIO) && !(bus->rangeMem) && !(bus->rangePFMem)) + rc = add_new_bus(bus, io, mem, pfmem, 0xFF); + else { + err("expected bus structure not empty?\n"); + retval = -EIO; + goto error; + } + if (rc) { + if (rc == -ENOMEM) { + ibmphp_remove_bus(bus, func->busno); + kfree(amount_needed); + return rc; + } + retval = rc; + goto error; + } + pci_bus_read_config_byte(ibmphp_pci_bus, devfn, PCI_IO_BASE, &io_base); + pci_bus_read_config_word(ibmphp_pci_bus, devfn, PCI_PREF_MEMORY_BASE, &pfmem_base); + + if ((io_base & PCI_IO_RANGE_TYPE_MASK) == PCI_IO_RANGE_TYPE_32) { + debug("io 32\n"); + need_io_upper = 1; + } + if ((pfmem_base & PCI_PREF_RANGE_TYPE_MASK) == PCI_PREF_RANGE_TYPE_64) { + debug("pfmem 64\n"); + need_pfmem_upper = 1; + } + + if (bus->noIORanges) { + pci_bus_write_config_byte(ibmphp_pci_bus, devfn, PCI_IO_BASE, 0x00 | bus->rangeIO->start >> 8); + pci_bus_write_config_byte(ibmphp_pci_bus, devfn, PCI_IO_LIMIT, 0x00 | bus->rangeIO->end >> 8); + + /* _______________This is for debugging purposes only ____________________ + pci_bus_read_config_byte(ibmphp_pci_bus, devfn, PCI_IO_BASE, &temp); + debug("io_base = %x\n", (temp & PCI_IO_RANGE_TYPE_MASK) << 8); + pci_bus_read_config_byte(ibmphp_pci_bus, devfn, PCI_IO_LIMIT, &temp); + debug("io_limit = %x\n", (temp & PCI_IO_RANGE_TYPE_MASK) << 8); + ________________________________________________________________________*/ + + if (need_io_upper) { /* since can't support n.e.ways */ + pci_bus_write_config_word(ibmphp_pci_bus, devfn, PCI_IO_BASE_UPPER16, 0x0000); + pci_bus_write_config_word(ibmphp_pci_bus, devfn, PCI_IO_LIMIT_UPPER16, 0x0000); + } + } else { + pci_bus_write_config_byte(ibmphp_pci_bus, devfn, PCI_IO_BASE, 0x00); + pci_bus_write_config_byte(ibmphp_pci_bus, devfn, PCI_IO_LIMIT, 0x00); + } + + if (bus->noMemRanges) { + pci_bus_write_config_word(ibmphp_pci_bus, devfn, PCI_MEMORY_BASE, 0x0000 | bus->rangeMem->start >> 16); + pci_bus_write_config_word(ibmphp_pci_bus, devfn, PCI_MEMORY_LIMIT, 0x0000 | bus->rangeMem->end >> 16); + + /* ____________________This is for debugging purposes only ________________________ + pci_bus_read_config_word(ibmphp_pci_bus, devfn, PCI_MEMORY_BASE, &temp); + debug("mem_base = %x\n", (temp & PCI_MEMORY_RANGE_TYPE_MASK) << 16); + pci_bus_read_config_word(ibmphp_pci_bus, devfn, PCI_MEMORY_LIMIT, &temp); + debug("mem_limit = %x\n", (temp & PCI_MEMORY_RANGE_TYPE_MASK) << 16); + __________________________________________________________________________________*/ + + } else { + pci_bus_write_config_word(ibmphp_pci_bus, devfn, PCI_MEMORY_BASE, 0xffff); + pci_bus_write_config_word(ibmphp_pci_bus, devfn, PCI_MEMORY_LIMIT, 0x0000); + } + if (bus->noPFMemRanges) { + pci_bus_write_config_word(ibmphp_pci_bus, devfn, PCI_PREF_MEMORY_BASE, 0x0000 | bus->rangePFMem->start >> 16); + pci_bus_write_config_word(ibmphp_pci_bus, devfn, PCI_PREF_MEMORY_LIMIT, 0x0000 | bus->rangePFMem->end >> 16); + + /* __________________________This is for debugging purposes only _______________________ + pci_bus_read_config_word(ibmphp_pci_bus, devfn, PCI_PREF_MEMORY_BASE, &temp); + debug("pfmem_base = %x", (temp & PCI_MEMORY_RANGE_TYPE_MASK) << 16); + pci_bus_read_config_word(ibmphp_pci_bus, devfn, PCI_PREF_MEMORY_LIMIT, &temp); + debug("pfmem_limit = %x\n", (temp & PCI_MEMORY_RANGE_TYPE_MASK) << 16); + ______________________________________________________________________________________*/ + + if (need_pfmem_upper) { /* since can't support n.e.ways */ + pci_bus_write_config_dword(ibmphp_pci_bus, devfn, PCI_PREF_BASE_UPPER32, 0x00000000); + pci_bus_write_config_dword(ibmphp_pci_bus, devfn, PCI_PREF_LIMIT_UPPER32, 0x00000000); + } + } else { + pci_bus_write_config_word(ibmphp_pci_bus, devfn, PCI_PREF_MEMORY_BASE, 0xffff); + pci_bus_write_config_word(ibmphp_pci_bus, devfn, PCI_PREF_MEMORY_LIMIT, 0x0000); + } + + debug("b4 writing control information\n"); + + pci_bus_read_config_byte(ibmphp_pci_bus, devfn, PCI_INTERRUPT_PIN, &irq); + if ((irq > 0x00) && (irq < 0x05)) + pci_bus_write_config_byte(ibmphp_pci_bus, devfn, PCI_INTERRUPT_LINE, func->irq[irq - 1]); + /* + pci_bus_write_config_byte(ibmphp_pci_bus, devfn, PCI_BRIDGE_CONTROL, ctrl); + pci_bus_write_config_byte(ibmphp_pci_bus, devfn, PCI_BRIDGE_CONTROL, PCI_BRIDGE_CTL_PARITY); + pci_bus_write_config_byte(ibmphp_pci_bus, devfn, PCI_BRIDGE_CONTROL, PCI_BRIDGE_CTL_SERR); + */ + + pci_bus_write_config_word(ibmphp_pci_bus, devfn, PCI_COMMAND, DEVICEENABLE); + pci_bus_write_config_word(ibmphp_pci_bus, devfn, PCI_BRIDGE_CONTROL, 0x07); + for (i = 0; i < 32; i++) { + if (amount_needed->devices[i]) { + debug("device where devices[i] is 1 = %x\n", i); + func->devices[i] = 1; + } + } + func->bus = 1; /* For unconfiguring, to indicate it's PPB */ + func_passed = &func; + debug("func->busno b4 returning is %x\n", func->busno); + debug("func->busno b4 returning in the other structure is %x\n", (*func_passed)->busno); + kfree(amount_needed); + return 0; + } else { + err("Configuring bridge was unsuccessful...\n"); + mem_tmp = NULL; + retval = -EIO; + goto error; + } + +error: + kfree(amount_needed); + if (pfmem) + ibmphp_remove_resource(pfmem); + if (io) + ibmphp_remove_resource(io); + if (mem) + ibmphp_remove_resource(mem); + for (i = 0; i < 2; i++) { /* for 2 BARs */ + if (bus_io[i]) { + ibmphp_remove_resource(bus_io[i]); + func->io[i] = NULL; + } else if (bus_pfmem[i]) { + ibmphp_remove_resource(bus_pfmem[i]); + func->pfmem[i] = NULL; + } else if (bus_mem[i]) { + ibmphp_remove_resource(bus_mem[i]); + func->mem[i] = NULL; + } + } + return retval; +} + +/***************************************************************************** + * This function adds up the amount of resources needed behind the PPB bridge + * and passes it to the configure_bridge function + * Input: bridge function + * Output: amount of resources needed + *****************************************************************************/ +static struct res_needed *scan_behind_bridge(struct pci_func *func, u8 busno) +{ + int count, len[6]; + u16 vendor_id; + u8 hdr_type; + u8 device, function; + unsigned int devfn; + int howmany = 0; /*this is to see if there are any devices behind the bridge */ + + u32 bar[6], class; + u32 address[] = { + PCI_BASE_ADDRESS_0, + PCI_BASE_ADDRESS_1, + PCI_BASE_ADDRESS_2, + PCI_BASE_ADDRESS_3, + PCI_BASE_ADDRESS_4, + PCI_BASE_ADDRESS_5, + 0 + }; + struct res_needed *amount; + + amount = kzalloc(sizeof(*amount), GFP_KERNEL); + if (amount == NULL) + return NULL; + + ibmphp_pci_bus->number = busno; + + debug("the bus_no behind the bridge is %x\n", busno); + debug("scanning devices behind the bridge...\n"); + for (device = 0; device < 32; device++) { + amount->devices[device] = 0; + for (function = 0; function < 8; function++) { + devfn = PCI_DEVFN(device, function); + + pci_bus_read_config_word(ibmphp_pci_bus, devfn, PCI_VENDOR_ID, &vendor_id); + + if (vendor_id != PCI_VENDOR_ID_NOTVALID) { + /* found correct device!!! */ + howmany++; + + pci_bus_read_config_byte(ibmphp_pci_bus, devfn, PCI_HEADER_TYPE, &hdr_type); + pci_bus_read_config_dword(ibmphp_pci_bus, devfn, PCI_CLASS_REVISION, &class); + + debug("hdr_type behind the bridge is %x\n", hdr_type); + if ((hdr_type & 0x7f) == PCI_HEADER_TYPE_BRIDGE) { + err("embedded bridges not supported for hot-plugging.\n"); + amount->not_correct = 1; + return amount; + } + + class >>= 8; /* to take revision out, class = class.subclass.prog i/f */ + if (class == PCI_CLASS_NOT_DEFINED_VGA) { + err("The device %x is VGA compatible and as is not supported for hot plugging. Please choose another device.\n", device); + amount->not_correct = 1; + return amount; + } else if (class == PCI_CLASS_DISPLAY_VGA) { + err("The device %x is not supported for hot plugging. Please choose another device.\n", device); + amount->not_correct = 1; + return amount; + } + + amount->devices[device] = 1; + + for (count = 0; address[count]; count++) { + /* for 6 BARs */ + /* + pci_bus_read_config_byte(ibmphp_pci_bus, devfn, address[count], &tmp); + if (tmp & 0x01) // IO + pci_bus_write_config_dword(ibmphp_pci_bus, devfn, address[count], 0xFFFFFFFD); + else // MEMORY + pci_bus_write_config_dword(ibmphp_pci_bus, devfn, address[count], 0xFFFFFFFF); + */ + pci_bus_write_config_dword(ibmphp_pci_bus, devfn, address[count], 0xFFFFFFFF); + pci_bus_read_config_dword(ibmphp_pci_bus, devfn, address[count], &bar[count]); + + debug("what is bar[count]? %x, count = %d\n", bar[count], count); + + if (!bar[count]) /* This BAR is not implemented */ + continue; + + //tmp_bar = bar[count]; + + debug("count %d device %x function %x wants %x resources\n", count, device, function, bar[count]); + + if (bar[count] & PCI_BASE_ADDRESS_SPACE_IO) { + /* This is IO */ + len[count] = bar[count] & 0xFFFFFFFC; + len[count] = ~len[count] + 1; + amount->io += len[count]; + } else { + /* This is Memory */ + if (bar[count] & PCI_BASE_ADDRESS_MEM_PREFETCH) { + /* pfmem */ + len[count] = bar[count] & 0xFFFFFFF0; + len[count] = ~len[count] + 1; + amount->pfmem += len[count]; + if (bar[count] & PCI_BASE_ADDRESS_MEM_TYPE_64) + /* takes up another dword */ + count += 1; + + } else { + /* regular memory */ + len[count] = bar[count] & 0xFFFFFFF0; + len[count] = ~len[count] + 1; + amount->mem += len[count]; + if (bar[count] & PCI_BASE_ADDRESS_MEM_TYPE_64) { + /* takes up another dword */ + count += 1; + } + } + } + } /* end for */ + } /* end if (valid) */ + } /* end for */ + } /* end for */ + + if (!howmany) + amount->not_correct = 1; + else + amount->not_correct = 0; + if ((amount->io) && (amount->io < IOBRIDGE)) + amount->io = IOBRIDGE; + if ((amount->mem) && (amount->mem < MEMBRIDGE)) + amount->mem = MEMBRIDGE; + if ((amount->pfmem) && (amount->pfmem < MEMBRIDGE)) + amount->pfmem = MEMBRIDGE; + return amount; +} + +/* The following 3 unconfigure_boot_ routines deal with the case when we had the card + * upon bootup in the system, since we don't allocate func to such case, we need to read + * the start addresses from pci config space and then find the corresponding entries in + * our resource lists. The functions return either 0, -ENODEV, or -1 (general failure) + * Change: we also call these functions even if we configured the card ourselves (i.e., not + * the bootup case), since it should work same way + */ +static int unconfigure_boot_device(u8 busno, u8 device, u8 function) +{ + u32 start_address; + u32 address[] = { + PCI_BASE_ADDRESS_0, + PCI_BASE_ADDRESS_1, + PCI_BASE_ADDRESS_2, + PCI_BASE_ADDRESS_3, + PCI_BASE_ADDRESS_4, + PCI_BASE_ADDRESS_5, + 0 + }; + int count; + struct resource_node *io; + struct resource_node *mem; + struct resource_node *pfmem; + struct bus_node *bus; + u32 end_address; + u32 temp_end; + u32 size; + u32 tmp_address; + unsigned int devfn; + + debug("%s - enter\n", __func__); + + bus = ibmphp_find_res_bus(busno); + if (!bus) { + debug("cannot find corresponding bus.\n"); + return -EINVAL; + } + + devfn = PCI_DEVFN(device, function); + ibmphp_pci_bus->number = busno; + for (count = 0; address[count]; count++) { /* for 6 BARs */ + pci_bus_read_config_dword(ibmphp_pci_bus, devfn, address[count], &start_address); + + /* We can do this here, b/c by that time the device driver of the card has been stopped */ + + pci_bus_write_config_dword(ibmphp_pci_bus, devfn, address[count], 0xFFFFFFFF); + pci_bus_read_config_dword(ibmphp_pci_bus, devfn, address[count], &size); + pci_bus_write_config_dword(ibmphp_pci_bus, devfn, address[count], start_address); + + debug("start_address is %x\n", start_address); + debug("busno, device, function %x %x %x\n", busno, device, function); + if (!size) { + /* This BAR is not implemented */ + debug("is this bar no implemented?, count = %d\n", count); + continue; + } + tmp_address = start_address; + if (start_address & PCI_BASE_ADDRESS_SPACE_IO) { + /* This is IO */ + start_address &= PCI_BASE_ADDRESS_IO_MASK; + size = size & 0xFFFFFFFC; + size = ~size + 1; + end_address = start_address + size - 1; + if (ibmphp_find_resource(bus, start_address, &io, IO)) + goto report_search_failure; + + debug("io->start = %x\n", io->start); + temp_end = io->end; + start_address = io->end + 1; + ibmphp_remove_resource(io); + /* This is needed b/c of the old I/O restrictions in the BIOS */ + while (temp_end < end_address) { + if (ibmphp_find_resource(bus, start_address, + &io, IO)) + goto report_search_failure; + + debug("io->start = %x\n", io->start); + temp_end = io->end; + start_address = io->end + 1; + ibmphp_remove_resource(io); + } + + /* ????????? DO WE NEED TO WRITE ANYTHING INTO THE PCI CONFIG SPACE BACK ?????????? */ + } else { + /* This is Memory */ + if (start_address & PCI_BASE_ADDRESS_MEM_PREFETCH) { + /* pfmem */ + debug("start address of pfmem is %x\n", start_address); + start_address &= PCI_BASE_ADDRESS_MEM_MASK; + + if (ibmphp_find_resource(bus, start_address, &pfmem, PFMEM) < 0) { + err("cannot find corresponding PFMEM resource to remove\n"); + return -EIO; + } + if (pfmem) { + debug("pfmem->start = %x\n", pfmem->start); + + ibmphp_remove_resource(pfmem); + } + } else { + /* regular memory */ + debug("start address of mem is %x\n", start_address); + start_address &= PCI_BASE_ADDRESS_MEM_MASK; + + if (ibmphp_find_resource(bus, start_address, &mem, MEM) < 0) { + err("cannot find corresponding MEM resource to remove\n"); + return -EIO; + } + if (mem) { + debug("mem->start = %x\n", mem->start); + + ibmphp_remove_resource(mem); + } + } + if (tmp_address & PCI_BASE_ADDRESS_MEM_TYPE_64) { + /* takes up another dword */ + count += 1; + } + } /* end of mem */ + } /* end of for */ + + return 0; + +report_search_failure: + err("cannot find corresponding IO resource to remove\n"); + return -EIO; +} + +static int unconfigure_boot_bridge(u8 busno, u8 device, u8 function) +{ + int count; + int bus_no, pri_no, sub_no, sec_no = 0; + u32 start_address, tmp_address; + u8 sec_number, sub_number, pri_number; + struct resource_node *io = NULL; + struct resource_node *mem = NULL; + struct resource_node *pfmem = NULL; + struct bus_node *bus; + u32 address[] = { + PCI_BASE_ADDRESS_0, + PCI_BASE_ADDRESS_1, + 0 + }; + unsigned int devfn; + + devfn = PCI_DEVFN(device, function); + ibmphp_pci_bus->number = busno; + bus_no = (int) busno; + debug("busno is %x\n", busno); + pci_bus_read_config_byte(ibmphp_pci_bus, devfn, PCI_PRIMARY_BUS, &pri_number); + debug("%s - busno = %x, primary_number = %x\n", __func__, busno, pri_number); + + pci_bus_read_config_byte(ibmphp_pci_bus, devfn, PCI_SECONDARY_BUS, &sec_number); + debug("sec_number is %x\n", sec_number); + sec_no = (int) sec_number; + pri_no = (int) pri_number; + if (pri_no != bus_no) { + err("primary numbers in our structures and pci config space don't match.\n"); + return -EINVAL; + } + + pci_bus_read_config_byte(ibmphp_pci_bus, devfn, PCI_SUBORDINATE_BUS, &sub_number); + sub_no = (int) sub_number; + debug("sub_no is %d, sec_no is %d\n", sub_no, sec_no); + if (sec_no != sub_number) { + err("there're more buses behind this bridge. Hot removal is not supported. Please choose another card\n"); + return -ENODEV; + } + + bus = ibmphp_find_res_bus(sec_number); + if (!bus) { + err("cannot find Bus structure for the bridged device\n"); + return -EINVAL; + } + debug("bus->busno is %x\n", bus->busno); + debug("sec_number is %x\n", sec_number); + + ibmphp_remove_bus(bus, busno); + + for (count = 0; address[count]; count++) { + /* for 2 BARs */ + pci_bus_read_config_dword(ibmphp_pci_bus, devfn, address[count], &start_address); + + if (!start_address) { + /* This BAR is not implemented */ + continue; + } + + tmp_address = start_address; + + if (start_address & PCI_BASE_ADDRESS_SPACE_IO) { + /* This is IO */ + start_address &= PCI_BASE_ADDRESS_IO_MASK; + if (ibmphp_find_resource(bus, start_address, &io, IO) < 0) { + err("cannot find corresponding IO resource to remove\n"); + return -EIO; + } + if (io) + debug("io->start = %x\n", io->start); + + ibmphp_remove_resource(io); + + /* ????????? DO WE NEED TO WRITE ANYTHING INTO THE PCI CONFIG SPACE BACK ?????????? */ + } else { + /* This is Memory */ + if (start_address & PCI_BASE_ADDRESS_MEM_PREFETCH) { + /* pfmem */ + start_address &= PCI_BASE_ADDRESS_MEM_MASK; + if (ibmphp_find_resource(bus, start_address, &pfmem, PFMEM) < 0) { + err("cannot find corresponding PFMEM resource to remove\n"); + return -EINVAL; + } + if (pfmem) { + debug("pfmem->start = %x\n", pfmem->start); + + ibmphp_remove_resource(pfmem); + } + } else { + /* regular memory */ + start_address &= PCI_BASE_ADDRESS_MEM_MASK; + if (ibmphp_find_resource(bus, start_address, &mem, MEM) < 0) { + err("cannot find corresponding MEM resource to remove\n"); + return -EINVAL; + } + if (mem) { + debug("mem->start = %x\n", mem->start); + + ibmphp_remove_resource(mem); + } + } + if (tmp_address & PCI_BASE_ADDRESS_MEM_TYPE_64) { + /* takes up another dword */ + count += 1; + } + } /* end of mem */ + } /* end of for */ + debug("%s - exiting, returning success\n", __func__); + return 0; +} + +static int unconfigure_boot_card(struct slot *slot_cur) +{ + u16 vendor_id; + u32 class; + u8 hdr_type; + u8 device; + u8 busno; + u8 function; + int rc; + unsigned int devfn; + u8 valid_device = 0x00; /* To see if we are ever able to find valid device and read it */ + + debug("%s - enter\n", __func__); + + device = slot_cur->device; + busno = slot_cur->bus; + + debug("b4 for loop, device is %x\n", device); + /* For every function on the card */ + for (function = 0x0; function < 0x08; function++) { + devfn = PCI_DEVFN(device, function); + ibmphp_pci_bus->number = busno; + + pci_bus_read_config_word(ibmphp_pci_bus, devfn, PCI_VENDOR_ID, &vendor_id); + + if (vendor_id != PCI_VENDOR_ID_NOTVALID) { + /* found correct device!!! */ + ++valid_device; + + debug("%s - found correct device\n", __func__); + + /* header: x x x x x x x x + * | |___________|=> 1=PPB bridge, 0=normal device, 2=CardBus Bridge + * |_=> 0 = single function device, 1 = multi-function device + */ + + pci_bus_read_config_byte(ibmphp_pci_bus, devfn, PCI_HEADER_TYPE, &hdr_type); + pci_bus_read_config_dword(ibmphp_pci_bus, devfn, PCI_CLASS_REVISION, &class); + + debug("hdr_type %x, class %x\n", hdr_type, class); + class >>= 8; /* to take revision out, class = class.subclass.prog i/f */ + if (class == PCI_CLASS_NOT_DEFINED_VGA) { + err("The device %x function %x is VGA compatible and is not supported for hot removing. Please choose another device.\n", device, function); + return -ENODEV; + } else if (class == PCI_CLASS_DISPLAY_VGA) { + err("The device %x function %x is not supported for hot removing. Please choose another device.\n", device, function); + return -ENODEV; + } + + switch (hdr_type) { + case PCI_HEADER_TYPE_NORMAL: + rc = unconfigure_boot_device(busno, device, function); + if (rc) { + err("was not able to unconfigure device %x func %x on bus %x. bailing out...\n", + device, function, busno); + return rc; + } + function = 0x8; + break; + case PCI_HEADER_TYPE_MULTIDEVICE: + rc = unconfigure_boot_device(busno, device, function); + if (rc) { + err("was not able to unconfigure device %x func %x on bus %x. bailing out...\n", + device, function, busno); + return rc; + } + break; + case PCI_HEADER_TYPE_BRIDGE: + class >>= 8; + if (class != PCI_CLASS_BRIDGE_PCI) { + err("This device %x function %x is not PCI-to-PCI bridge, and is not supported for hot-removing. Please try another card.\n", device, function); + return -ENODEV; + } + rc = unconfigure_boot_bridge(busno, device, function); + if (rc != 0) { + err("was not able to hot-remove PPB properly.\n"); + return rc; + } + + function = 0x8; + break; + case PCI_HEADER_TYPE_MULTIBRIDGE: + class >>= 8; + if (class != PCI_CLASS_BRIDGE_PCI) { + err("This device %x function %x is not PCI-to-PCI bridge, and is not supported for hot-removing. Please try another card.\n", device, function); + return -ENODEV; + } + rc = unconfigure_boot_bridge(busno, device, function); + if (rc != 0) { + err("was not able to hot-remove PPB properly.\n"); + return rc; + } + break; + default: + err("MAJOR PROBLEM!!!! Cannot read device's header\n"); + return -1; + break; + } /* end of switch */ + } /* end of valid device */ + } /* end of for */ + + if (!valid_device) { + err("Could not find device to unconfigure. Or could not read the card.\n"); + return -1; + } + return 0; +} + +/* + * free the resources of the card (multi, single, or bridged) + * Parameters: slot, flag to say if this is for removing entire module or just + * unconfiguring the device + * TO DO: will probably need to add some code in case there was some resource, + * to remove it... this is from when we have errors in the configure_card... + * !!!!!!!!!!!!!!!!!!!!!!!!!FOR BUSES!!!!!!!!!!!! + * Returns: 0, -1, -ENODEV + */ +int ibmphp_unconfigure_card(struct slot **slot_cur, int the_end) +{ + int i; + int count; + int rc; + struct slot *sl = *slot_cur; + struct pci_func *cur_func = NULL; + struct pci_func *temp_func; + + debug("%s - enter\n", __func__); + + if (!the_end) { + /* Need to unconfigure the card */ + rc = unconfigure_boot_card(sl); + if ((rc == -ENODEV) || (rc == -EIO) || (rc == -EINVAL)) { + /* In all other cases, will still need to get rid of func structure if it exists */ + return rc; + } + } + + if (sl->func) { + cur_func = sl->func; + while (cur_func) { + /* TO DO: WILL MOST LIKELY NEED TO GET RID OF THE BUS STRUCTURE FROM RESOURCES AS WELL */ + if (cur_func->bus) { + /* in other words, it's a PPB */ + count = 2; + } else { + count = 6; + } + + for (i = 0; i < count; i++) { + if (cur_func->io[i]) { + debug("io[%d] exists\n", i); + if (the_end > 0) + ibmphp_remove_resource(cur_func->io[i]); + cur_func->io[i] = NULL; + } + if (cur_func->mem[i]) { + debug("mem[%d] exists\n", i); + if (the_end > 0) + ibmphp_remove_resource(cur_func->mem[i]); + cur_func->mem[i] = NULL; + } + if (cur_func->pfmem[i]) { + debug("pfmem[%d] exists\n", i); + if (the_end > 0) + ibmphp_remove_resource(cur_func->pfmem[i]); + cur_func->pfmem[i] = NULL; + } + } + + temp_func = cur_func->next; + kfree(cur_func); + cur_func = temp_func; + } + } + + sl->func = NULL; + *slot_cur = sl; + debug("%s - exit\n", __func__); + return 0; +} + +/* + * add a new bus resulting from hot-plugging a PPB bridge with devices + * + * Input: bus and the amount of resources needed (we know we can assign those, + * since they've been checked already + * Output: bus added to the correct spot + * 0, -1, error + */ +static int add_new_bus(struct bus_node *bus, struct resource_node *io, struct resource_node *mem, struct resource_node *pfmem, u8 parent_busno) +{ + struct range_node *io_range = NULL; + struct range_node *mem_range = NULL; + struct range_node *pfmem_range = NULL; + struct bus_node *cur_bus = NULL; + + /* Trying to find the parent bus number */ + if (parent_busno != 0xFF) { + cur_bus = ibmphp_find_res_bus(parent_busno); + if (!cur_bus) { + err("strange, cannot find bus which is supposed to be at the system... something is terribly wrong...\n"); + return -ENODEV; + } + + list_add(&bus->bus_list, &cur_bus->bus_list); + } + if (io) { + io_range = kzalloc(sizeof(*io_range), GFP_KERNEL); + if (!io_range) + return -ENOMEM; + + io_range->start = io->start; + io_range->end = io->end; + io_range->rangeno = 1; + bus->noIORanges = 1; + bus->rangeIO = io_range; + } + if (mem) { + mem_range = kzalloc(sizeof(*mem_range), GFP_KERNEL); + if (!mem_range) + return -ENOMEM; + + mem_range->start = mem->start; + mem_range->end = mem->end; + mem_range->rangeno = 1; + bus->noMemRanges = 1; + bus->rangeMem = mem_range; + } + if (pfmem) { + pfmem_range = kzalloc(sizeof(*pfmem_range), GFP_KERNEL); + if (!pfmem_range) + return -ENOMEM; + + pfmem_range->start = pfmem->start; + pfmem_range->end = pfmem->end; + pfmem_range->rangeno = 1; + bus->noPFMemRanges = 1; + bus->rangePFMem = pfmem_range; + } + return 0; +} + +/* + * find the 1st available bus number for PPB to set as its secondary bus + * Parameters: bus_number of the primary bus + * Returns: bus_number of the secondary bus or 0xff in case of failure + */ +static u8 find_sec_number(u8 primary_busno, u8 slotno) +{ + int min, max; + u8 busno; + struct bus_info *bus; + struct bus_node *bus_cur; + + bus = ibmphp_find_same_bus_num(primary_busno); + if (!bus) { + err("cannot get slot range of the bus from the BIOS\n"); + return 0xff; + } + max = bus->slot_max; + min = bus->slot_min; + if ((slotno > max) || (slotno < min)) { + err("got the wrong range\n"); + return 0xff; + } + busno = (u8) (slotno - (u8) min); + busno += primary_busno + 0x01; + bus_cur = ibmphp_find_res_bus(busno); + /* either there is no such bus number, or there are no ranges, which + * can only happen if we removed the bridged device in previous load + * of the driver, and now only have the skeleton bus struct + */ + if ((!bus_cur) || (!(bus_cur->rangeIO) && !(bus_cur->rangeMem) && !(bus_cur->rangePFMem))) + return busno; + return 0xff; +} |