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0001 // SPDX-License-Identifier: GPL-2.0+
0002 /*
0003  * IBM Hot Plug Controller Driver
0004  *
0005  * Written By: Chuck Cole, Jyoti Shah, Tong Yu, Irene Zubarev, IBM Corporation
0006  *
0007  * Copyright (C) 2001,2003 Greg Kroah-Hartman (greg@kroah.com)
0008  * Copyright (C) 2001-2003 IBM Corp.
0009  *
0010  * All rights reserved.
0011  *
0012  * Send feedback to <gregkh@us.ibm.com>
0013  *
0014  */
0015 
0016 #include <linux/init.h>
0017 #include <linux/module.h>
0018 #include <linux/slab.h>
0019 #include <linux/pci.h>
0020 #include <linux/interrupt.h>
0021 #include <linux/delay.h>
0022 #include <linux/wait.h>
0023 #include "../pci.h"
0024 #include <asm/pci_x86.h>        /* for struct irq_routing_table */
0025 #include <asm/io_apic.h>
0026 #include "ibmphp.h"
0027 
0028 #define attn_on(sl)  ibmphp_hpc_writeslot(sl, HPC_SLOT_ATTNON)
0029 #define attn_off(sl) ibmphp_hpc_writeslot(sl, HPC_SLOT_ATTNOFF)
0030 #define attn_LED_blink(sl) ibmphp_hpc_writeslot(sl, HPC_SLOT_BLINKLED)
0031 #define get_ctrl_revision(sl, rev) ibmphp_hpc_readslot(sl, READ_REVLEVEL, rev)
0032 #define get_hpc_options(sl, opt) ibmphp_hpc_readslot(sl, READ_HPCOPTIONS, opt)
0033 
0034 #define DRIVER_VERSION  "0.6"
0035 #define DRIVER_DESC "IBM Hot Plug PCI Controller Driver"
0036 
0037 int ibmphp_debug;
0038 
0039 static bool debug;
0040 module_param(debug, bool, S_IRUGO | S_IWUSR);
0041 MODULE_PARM_DESC(debug, "Debugging mode enabled or not");
0042 MODULE_LICENSE("GPL");
0043 MODULE_DESCRIPTION(DRIVER_DESC);
0044 
0045 struct pci_bus *ibmphp_pci_bus;
0046 static int max_slots;
0047 
0048 static int irqs[16];    /* PIC mode IRQs we're using so far (in case MPS
0049              * tables don't provide default info for empty slots */
0050 
0051 static int init_flag;
0052 
0053 static inline int get_cur_bus_info(struct slot **sl)
0054 {
0055     int rc = 1;
0056     struct slot *slot_cur = *sl;
0057 
0058     debug("options = %x\n", slot_cur->ctrl->options);
0059     debug("revision = %x\n", slot_cur->ctrl->revision);
0060 
0061     if (READ_BUS_STATUS(slot_cur->ctrl))
0062         rc = ibmphp_hpc_readslot(slot_cur, READ_BUSSTATUS, NULL);
0063 
0064     if (rc)
0065         return rc;
0066 
0067     slot_cur->bus_on->current_speed = CURRENT_BUS_SPEED(slot_cur->busstatus);
0068     if (READ_BUS_MODE(slot_cur->ctrl))
0069         slot_cur->bus_on->current_bus_mode =
0070                 CURRENT_BUS_MODE(slot_cur->busstatus);
0071     else
0072         slot_cur->bus_on->current_bus_mode = 0xFF;
0073 
0074     debug("busstatus = %x, bus_speed = %x, bus_mode = %x\n",
0075             slot_cur->busstatus,
0076             slot_cur->bus_on->current_speed,
0077             slot_cur->bus_on->current_bus_mode);
0078 
0079     *sl = slot_cur;
0080     return 0;
0081 }
0082 
0083 static inline int slot_update(struct slot **sl)
0084 {
0085     int rc;
0086     rc = ibmphp_hpc_readslot(*sl, READ_ALLSTAT, NULL);
0087     if (rc)
0088         return rc;
0089     if (!init_flag)
0090         rc = get_cur_bus_info(sl);
0091     return rc;
0092 }
0093 
0094 static int __init get_max_slots(void)
0095 {
0096     struct slot *slot_cur;
0097     u8 slot_count = 0;
0098 
0099     list_for_each_entry(slot_cur, &ibmphp_slot_head, ibm_slot_list) {
0100         /* sometimes the hot-pluggable slots start with 4 (not always from 1) */
0101         slot_count = max(slot_count, slot_cur->number);
0102     }
0103     return slot_count;
0104 }
0105 
0106 /* This routine will put the correct slot->device information per slot.  It's
0107  * called from initialization of the slot structures. It will also assign
0108  * interrupt numbers per each slot.
0109  * Parameters: struct slot
0110  * Returns 0 or errors
0111  */
0112 int ibmphp_init_devno(struct slot **cur_slot)
0113 {
0114     struct irq_routing_table *rtable;
0115     int len;
0116     int loop;
0117     int i;
0118 
0119     rtable = pcibios_get_irq_routing_table();
0120     if (!rtable) {
0121         err("no BIOS routing table...\n");
0122         return -ENOMEM;
0123     }
0124 
0125     len = (rtable->size - sizeof(struct irq_routing_table)) /
0126             sizeof(struct irq_info);
0127 
0128     if (!len) {
0129         kfree(rtable);
0130         return -1;
0131     }
0132     for (loop = 0; loop < len; loop++) {
0133         if ((*cur_slot)->number == rtable->slots[loop].slot &&
0134             (*cur_slot)->bus == rtable->slots[loop].bus) {
0135             (*cur_slot)->device = PCI_SLOT(rtable->slots[loop].devfn);
0136             for (i = 0; i < 4; i++)
0137                 (*cur_slot)->irq[i] = IO_APIC_get_PCI_irq_vector((int) (*cur_slot)->bus,
0138                         (int) (*cur_slot)->device, i);
0139 
0140             debug("(*cur_slot)->irq[0] = %x\n",
0141                     (*cur_slot)->irq[0]);
0142             debug("(*cur_slot)->irq[1] = %x\n",
0143                     (*cur_slot)->irq[1]);
0144             debug("(*cur_slot)->irq[2] = %x\n",
0145                     (*cur_slot)->irq[2]);
0146             debug("(*cur_slot)->irq[3] = %x\n",
0147                     (*cur_slot)->irq[3]);
0148 
0149             debug("rtable->exclusive_irqs = %x\n",
0150                     rtable->exclusive_irqs);
0151             debug("rtable->slots[loop].irq[0].bitmap = %x\n",
0152                     rtable->slots[loop].irq[0].bitmap);
0153             debug("rtable->slots[loop].irq[1].bitmap = %x\n",
0154                     rtable->slots[loop].irq[1].bitmap);
0155             debug("rtable->slots[loop].irq[2].bitmap = %x\n",
0156                     rtable->slots[loop].irq[2].bitmap);
0157             debug("rtable->slots[loop].irq[3].bitmap = %x\n",
0158                     rtable->slots[loop].irq[3].bitmap);
0159 
0160             debug("rtable->slots[loop].irq[0].link = %x\n",
0161                     rtable->slots[loop].irq[0].link);
0162             debug("rtable->slots[loop].irq[1].link = %x\n",
0163                     rtable->slots[loop].irq[1].link);
0164             debug("rtable->slots[loop].irq[2].link = %x\n",
0165                     rtable->slots[loop].irq[2].link);
0166             debug("rtable->slots[loop].irq[3].link = %x\n",
0167                     rtable->slots[loop].irq[3].link);
0168             debug("end of init_devno\n");
0169             kfree(rtable);
0170             return 0;
0171         }
0172     }
0173 
0174     kfree(rtable);
0175     return -1;
0176 }
0177 
0178 static inline int power_on(struct slot *slot_cur)
0179 {
0180     u8 cmd = HPC_SLOT_ON;
0181     int retval;
0182 
0183     retval = ibmphp_hpc_writeslot(slot_cur, cmd);
0184     if (retval) {
0185         err("power on failed\n");
0186         return retval;
0187     }
0188     if (CTLR_RESULT(slot_cur->ctrl->status)) {
0189         err("command not completed successfully in power_on\n");
0190         return -EIO;
0191     }
0192     msleep(3000);   /* For ServeRAID cards, and some 66 PCI */
0193     return 0;
0194 }
0195 
0196 static inline int power_off(struct slot *slot_cur)
0197 {
0198     u8 cmd = HPC_SLOT_OFF;
0199     int retval;
0200 
0201     retval = ibmphp_hpc_writeslot(slot_cur, cmd);
0202     if (retval) {
0203         err("power off failed\n");
0204         return retval;
0205     }
0206     if (CTLR_RESULT(slot_cur->ctrl->status)) {
0207         err("command not completed successfully in power_off\n");
0208         retval = -EIO;
0209     }
0210     return retval;
0211 }
0212 
0213 static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 value)
0214 {
0215     int rc = 0;
0216     struct slot *pslot;
0217     u8 cmd = 0x00;     /* avoid compiler warning */
0218 
0219     debug("set_attention_status - Entry hotplug_slot[%lx] value[%x]\n",
0220             (ulong) hotplug_slot, value);
0221     ibmphp_lock_operations();
0222 
0223 
0224     if (hotplug_slot) {
0225         switch (value) {
0226         case HPC_SLOT_ATTN_OFF:
0227             cmd = HPC_SLOT_ATTNOFF;
0228             break;
0229         case HPC_SLOT_ATTN_ON:
0230             cmd = HPC_SLOT_ATTNON;
0231             break;
0232         case HPC_SLOT_ATTN_BLINK:
0233             cmd = HPC_SLOT_BLINKLED;
0234             break;
0235         default:
0236             rc = -ENODEV;
0237             err("set_attention_status - Error : invalid input [%x]\n",
0238                     value);
0239             break;
0240         }
0241         if (rc == 0) {
0242             pslot = to_slot(hotplug_slot);
0243             rc = ibmphp_hpc_writeslot(pslot, cmd);
0244         }
0245     } else
0246         rc = -ENODEV;
0247 
0248     ibmphp_unlock_operations();
0249 
0250     debug("set_attention_status - Exit rc[%d]\n", rc);
0251     return rc;
0252 }
0253 
0254 static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 *value)
0255 {
0256     int rc = -ENODEV;
0257     struct slot *pslot;
0258     struct slot myslot;
0259 
0260     debug("get_attention_status - Entry hotplug_slot[%lx] pvalue[%lx]\n",
0261                     (ulong) hotplug_slot, (ulong) value);
0262 
0263     ibmphp_lock_operations();
0264     if (hotplug_slot) {
0265         pslot = to_slot(hotplug_slot);
0266         memcpy(&myslot, pslot, sizeof(struct slot));
0267         rc = ibmphp_hpc_readslot(pslot, READ_SLOTSTATUS,
0268                      &myslot.status);
0269         if (!rc)
0270             rc = ibmphp_hpc_readslot(pslot, READ_EXTSLOTSTATUS,
0271                          &myslot.ext_status);
0272         if (!rc)
0273             *value = SLOT_ATTN(myslot.status, myslot.ext_status);
0274     }
0275 
0276     ibmphp_unlock_operations();
0277     debug("get_attention_status - Exit rc[%d] value[%x]\n", rc, *value);
0278     return rc;
0279 }
0280 
0281 static int get_latch_status(struct hotplug_slot *hotplug_slot, u8 *value)
0282 {
0283     int rc = -ENODEV;
0284     struct slot *pslot;
0285     struct slot myslot;
0286 
0287     debug("get_latch_status - Entry hotplug_slot[%lx] pvalue[%lx]\n",
0288                     (ulong) hotplug_slot, (ulong) value);
0289     ibmphp_lock_operations();
0290     if (hotplug_slot) {
0291         pslot = to_slot(hotplug_slot);
0292         memcpy(&myslot, pslot, sizeof(struct slot));
0293         rc = ibmphp_hpc_readslot(pslot, READ_SLOTSTATUS,
0294                      &myslot.status);
0295         if (!rc)
0296             *value = SLOT_LATCH(myslot.status);
0297     }
0298 
0299     ibmphp_unlock_operations();
0300     debug("get_latch_status - Exit rc[%d] rc[%x] value[%x]\n",
0301             rc, rc, *value);
0302     return rc;
0303 }
0304 
0305 
0306 static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value)
0307 {
0308     int rc = -ENODEV;
0309     struct slot *pslot;
0310     struct slot myslot;
0311 
0312     debug("get_power_status - Entry hotplug_slot[%lx] pvalue[%lx]\n",
0313                     (ulong) hotplug_slot, (ulong) value);
0314     ibmphp_lock_operations();
0315     if (hotplug_slot) {
0316         pslot = to_slot(hotplug_slot);
0317         memcpy(&myslot, pslot, sizeof(struct slot));
0318         rc = ibmphp_hpc_readslot(pslot, READ_SLOTSTATUS,
0319                      &myslot.status);
0320         if (!rc)
0321             *value = SLOT_PWRGD(myslot.status);
0322     }
0323 
0324     ibmphp_unlock_operations();
0325     debug("get_power_status - Exit rc[%d] rc[%x] value[%x]\n",
0326             rc, rc, *value);
0327     return rc;
0328 }
0329 
0330 static int get_adapter_present(struct hotplug_slot *hotplug_slot, u8 *value)
0331 {
0332     int rc = -ENODEV;
0333     struct slot *pslot;
0334     u8 present;
0335     struct slot myslot;
0336 
0337     debug("get_adapter_status - Entry hotplug_slot[%lx] pvalue[%lx]\n",
0338                     (ulong) hotplug_slot, (ulong) value);
0339     ibmphp_lock_operations();
0340     if (hotplug_slot) {
0341         pslot = to_slot(hotplug_slot);
0342         memcpy(&myslot, pslot, sizeof(struct slot));
0343         rc = ibmphp_hpc_readslot(pslot, READ_SLOTSTATUS,
0344                      &myslot.status);
0345         if (!rc) {
0346             present = SLOT_PRESENT(myslot.status);
0347             if (present == HPC_SLOT_EMPTY)
0348                 *value = 0;
0349             else
0350                 *value = 1;
0351         }
0352     }
0353 
0354     ibmphp_unlock_operations();
0355     debug("get_adapter_present - Exit rc[%d] value[%x]\n", rc, *value);
0356     return rc;
0357 }
0358 
0359 static int get_max_bus_speed(struct slot *slot)
0360 {
0361     int rc = 0;
0362     u8 mode = 0;
0363     enum pci_bus_speed speed;
0364     struct pci_bus *bus = slot->hotplug_slot.pci_slot->bus;
0365 
0366     debug("%s - Entry slot[%p]\n", __func__, slot);
0367 
0368     ibmphp_lock_operations();
0369     mode = slot->supported_bus_mode;
0370     speed = slot->supported_speed;
0371     ibmphp_unlock_operations();
0372 
0373     switch (speed) {
0374     case BUS_SPEED_33:
0375         break;
0376     case BUS_SPEED_66:
0377         if (mode == BUS_MODE_PCIX)
0378             speed += 0x01;
0379         break;
0380     case BUS_SPEED_100:
0381     case BUS_SPEED_133:
0382         speed += 0x01;
0383         break;
0384     default:
0385         /* Note (will need to change): there would be soon 256, 512 also */
0386         rc = -ENODEV;
0387     }
0388 
0389     if (!rc)
0390         bus->max_bus_speed = speed;
0391 
0392     debug("%s - Exit rc[%d] speed[%x]\n", __func__, rc, speed);
0393     return rc;
0394 }
0395 
0396 /****************************************************************************
0397  * This routine will initialize the ops data structure used in the validate
0398  * function. It will also power off empty slots that are powered on since BIOS
0399  * leaves those on, albeit disconnected
0400  ****************************************************************************/
0401 static int __init init_ops(void)
0402 {
0403     struct slot *slot_cur;
0404     int retval;
0405     int rc;
0406 
0407     list_for_each_entry(slot_cur, &ibmphp_slot_head, ibm_slot_list) {
0408         debug("BEFORE GETTING SLOT STATUS, slot # %x\n",
0409                             slot_cur->number);
0410         if (slot_cur->ctrl->revision == 0xFF)
0411             if (get_ctrl_revision(slot_cur,
0412                         &slot_cur->ctrl->revision))
0413                 return -1;
0414 
0415         if (slot_cur->bus_on->current_speed == 0xFF)
0416             if (get_cur_bus_info(&slot_cur))
0417                 return -1;
0418         get_max_bus_speed(slot_cur);
0419 
0420         if (slot_cur->ctrl->options == 0xFF)
0421             if (get_hpc_options(slot_cur, &slot_cur->ctrl->options))
0422                 return -1;
0423 
0424         retval = slot_update(&slot_cur);
0425         if (retval)
0426             return retval;
0427 
0428         debug("status = %x\n", slot_cur->status);
0429         debug("ext_status = %x\n", slot_cur->ext_status);
0430         debug("SLOT_POWER = %x\n", SLOT_POWER(slot_cur->status));
0431         debug("SLOT_PRESENT = %x\n", SLOT_PRESENT(slot_cur->status));
0432         debug("SLOT_LATCH = %x\n", SLOT_LATCH(slot_cur->status));
0433 
0434         if ((SLOT_PWRGD(slot_cur->status)) &&
0435             !(SLOT_PRESENT(slot_cur->status)) &&
0436             !(SLOT_LATCH(slot_cur->status))) {
0437             debug("BEFORE POWER OFF COMMAND\n");
0438                 rc = power_off(slot_cur);
0439                 if (rc)
0440                     return rc;
0441 
0442     /*      retval = slot_update(&slot_cur);
0443      *      if (retval)
0444      *          return retval;
0445      *      ibmphp_update_slot_info(slot_cur);
0446      */
0447         }
0448     }
0449     init_flag = 0;
0450     return 0;
0451 }
0452 
0453 /* This operation will check whether the slot is within the bounds and
0454  * the operation is valid to perform on that slot
0455  * Parameters: slot, operation
0456  * Returns: 0 or error codes
0457  */
0458 static int validate(struct slot *slot_cur, int opn)
0459 {
0460     int number;
0461     int retval;
0462 
0463     if (!slot_cur)
0464         return -ENODEV;
0465     number = slot_cur->number;
0466     if ((number > max_slots) || (number < 0))
0467         return -EBADSLT;
0468     debug("slot_number in validate is %d\n", slot_cur->number);
0469 
0470     retval = slot_update(&slot_cur);
0471     if (retval)
0472         return retval;
0473 
0474     switch (opn) {
0475         case ENABLE:
0476             if (!(SLOT_PWRGD(slot_cur->status)) &&
0477                  (SLOT_PRESENT(slot_cur->status)) &&
0478                  !(SLOT_LATCH(slot_cur->status)))
0479                 return 0;
0480             break;
0481         case DISABLE:
0482             if ((SLOT_PWRGD(slot_cur->status)) &&
0483                 (SLOT_PRESENT(slot_cur->status)) &&
0484                 !(SLOT_LATCH(slot_cur->status)))
0485                 return 0;
0486             break;
0487         default:
0488             break;
0489     }
0490     err("validate failed....\n");
0491     return -EINVAL;
0492 }
0493 
0494 /****************************************************************************
0495  * This routine is for updating the data structures in the hotplug core
0496  * Parameters: struct slot
0497  * Returns: 0 or error
0498  ****************************************************************************/
0499 int ibmphp_update_slot_info(struct slot *slot_cur)
0500 {
0501     struct pci_bus *bus = slot_cur->hotplug_slot.pci_slot->bus;
0502     u8 bus_speed;
0503     u8 mode;
0504 
0505     bus_speed = slot_cur->bus_on->current_speed;
0506     mode = slot_cur->bus_on->current_bus_mode;
0507 
0508     switch (bus_speed) {
0509         case BUS_SPEED_33:
0510             break;
0511         case BUS_SPEED_66:
0512             if (mode == BUS_MODE_PCIX)
0513                 bus_speed += 0x01;
0514             else if (mode == BUS_MODE_PCI)
0515                 ;
0516             else
0517                 bus_speed = PCI_SPEED_UNKNOWN;
0518             break;
0519         case BUS_SPEED_100:
0520         case BUS_SPEED_133:
0521             bus_speed += 0x01;
0522             break;
0523         default:
0524             bus_speed = PCI_SPEED_UNKNOWN;
0525     }
0526 
0527     bus->cur_bus_speed = bus_speed;
0528     // To do: bus_names
0529 
0530     return 0;
0531 }
0532 
0533 
0534 /******************************************************************************
0535  * This function will return the pci_func, given bus and devfunc, or NULL.  It
0536  * is called from visit routines
0537  ******************************************************************************/
0538 
0539 static struct pci_func *ibm_slot_find(u8 busno, u8 device, u8 function)
0540 {
0541     struct pci_func *func_cur;
0542     struct slot *slot_cur;
0543     list_for_each_entry(slot_cur, &ibmphp_slot_head, ibm_slot_list) {
0544         if (slot_cur->func) {
0545             func_cur = slot_cur->func;
0546             while (func_cur) {
0547                 if ((func_cur->busno == busno) &&
0548                         (func_cur->device == device) &&
0549                         (func_cur->function == function))
0550                     return func_cur;
0551                 func_cur = func_cur->next;
0552             }
0553         }
0554     }
0555     return NULL;
0556 }
0557 
0558 /*************************************************************
0559  * This routine frees up memory used by struct slot, including
0560  * the pointers to pci_func, bus, hotplug_slot, controller,
0561  * and deregistering from the hotplug core
0562  *************************************************************/
0563 static void free_slots(void)
0564 {
0565     struct slot *slot_cur, *next;
0566 
0567     debug("%s -- enter\n", __func__);
0568 
0569     list_for_each_entry_safe(slot_cur, next, &ibmphp_slot_head,
0570                  ibm_slot_list) {
0571         pci_hp_del(&slot_cur->hotplug_slot);
0572         slot_cur->ctrl = NULL;
0573         slot_cur->bus_on = NULL;
0574 
0575         /*
0576          * We don't want to actually remove the resources,
0577          * since ibmphp_free_resources() will do just that.
0578          */
0579         ibmphp_unconfigure_card(&slot_cur, -1);
0580 
0581         pci_hp_destroy(&slot_cur->hotplug_slot);
0582         kfree(slot_cur);
0583     }
0584     debug("%s -- exit\n", __func__);
0585 }
0586 
0587 static void ibm_unconfigure_device(struct pci_func *func)
0588 {
0589     struct pci_dev *temp;
0590     u8 j;
0591 
0592     debug("inside %s\n", __func__);
0593     debug("func->device = %x, func->function = %x\n",
0594                     func->device, func->function);
0595     debug("func->device << 3 | 0x0  = %x\n", func->device << 3 | 0x0);
0596 
0597     pci_lock_rescan_remove();
0598 
0599     for (j = 0; j < 0x08; j++) {
0600         temp = pci_get_domain_bus_and_slot(0, func->busno,
0601                            (func->device << 3) | j);
0602         if (temp) {
0603             pci_stop_and_remove_bus_device(temp);
0604             pci_dev_put(temp);
0605         }
0606     }
0607 
0608     pci_dev_put(func->dev);
0609 
0610     pci_unlock_rescan_remove();
0611 }
0612 
0613 /*
0614  * The following function is to fix kernel bug regarding
0615  * getting bus entries, here we manually add those primary
0616  * bus entries to kernel bus structure whenever apply
0617  */
0618 static u8 bus_structure_fixup(u8 busno)
0619 {
0620     struct pci_bus *bus, *b;
0621     struct pci_dev *dev;
0622     u16 l;
0623 
0624     if (pci_find_bus(0, busno) || !(ibmphp_find_same_bus_num(busno)))
0625         return 1;
0626 
0627     bus = kmalloc(sizeof(*bus), GFP_KERNEL);
0628     if (!bus)
0629         return 1;
0630 
0631     dev = kmalloc(sizeof(*dev), GFP_KERNEL);
0632     if (!dev) {
0633         kfree(bus);
0634         return 1;
0635     }
0636 
0637     bus->number = busno;
0638     bus->ops = ibmphp_pci_bus->ops;
0639     dev->bus = bus;
0640     for (dev->devfn = 0; dev->devfn < 256; dev->devfn += 8) {
0641         if (!pci_read_config_word(dev, PCI_VENDOR_ID, &l) &&
0642                     (l != 0x0000) && (l != 0xffff)) {
0643             debug("%s - Inside bus_structure_fixup()\n",
0644                             __func__);
0645             b = pci_scan_bus(busno, ibmphp_pci_bus->ops, NULL);
0646             if (!b)
0647                 continue;
0648 
0649             pci_bus_add_devices(b);
0650             break;
0651         }
0652     }
0653 
0654     kfree(dev);
0655     kfree(bus);
0656 
0657     return 0;
0658 }
0659 
0660 static int ibm_configure_device(struct pci_func *func)
0661 {
0662     struct pci_bus *child;
0663     int num;
0664     int flag = 0;   /* this is to make sure we don't double scan the bus,
0665                     for bridged devices primarily */
0666 
0667     pci_lock_rescan_remove();
0668 
0669     if (!(bus_structure_fixup(func->busno)))
0670         flag = 1;
0671     if (func->dev == NULL)
0672         func->dev = pci_get_domain_bus_and_slot(0, func->busno,
0673                 PCI_DEVFN(func->device, func->function));
0674 
0675     if (func->dev == NULL) {
0676         struct pci_bus *bus = pci_find_bus(0, func->busno);
0677         if (!bus)
0678             goto out;
0679 
0680         num = pci_scan_slot(bus,
0681                 PCI_DEVFN(func->device, func->function));
0682         if (num)
0683             pci_bus_add_devices(bus);
0684 
0685         func->dev = pci_get_domain_bus_and_slot(0, func->busno,
0686                 PCI_DEVFN(func->device, func->function));
0687         if (func->dev == NULL) {
0688             err("ERROR... : pci_dev still NULL\n");
0689             goto out;
0690         }
0691     }
0692     if (!(flag) && (func->dev->hdr_type == PCI_HEADER_TYPE_BRIDGE)) {
0693         pci_hp_add_bridge(func->dev);
0694         child = func->dev->subordinate;
0695         if (child)
0696             pci_bus_add_devices(child);
0697     }
0698 
0699  out:
0700     pci_unlock_rescan_remove();
0701     return 0;
0702 }
0703 
0704 /*******************************************************
0705  * Returns whether the bus is empty or not
0706  *******************************************************/
0707 static int is_bus_empty(struct slot *slot_cur)
0708 {
0709     int rc;
0710     struct slot *tmp_slot;
0711     u8 i = slot_cur->bus_on->slot_min;
0712 
0713     while (i <= slot_cur->bus_on->slot_max) {
0714         if (i == slot_cur->number) {
0715             i++;
0716             continue;
0717         }
0718         tmp_slot = ibmphp_get_slot_from_physical_num(i);
0719         if (!tmp_slot)
0720             return 0;
0721         rc = slot_update(&tmp_slot);
0722         if (rc)
0723             return 0;
0724         if (SLOT_PRESENT(tmp_slot->status) &&
0725                     SLOT_PWRGD(tmp_slot->status))
0726             return 0;
0727         i++;
0728     }
0729     return 1;
0730 }
0731 
0732 /***********************************************************
0733  * If the HPC permits and the bus currently empty, tries to set the
0734  * bus speed and mode at the maximum card and bus capability
0735  * Parameters: slot
0736  * Returns: bus is set (0) or error code
0737  ***********************************************************/
0738 static int set_bus(struct slot *slot_cur)
0739 {
0740     int rc;
0741     u8 speed;
0742     u8 cmd = 0x0;
0743     int retval;
0744     static const struct pci_device_id ciobx[] = {
0745         { PCI_DEVICE(PCI_VENDOR_ID_SERVERWORKS, 0x0101) },
0746         { },
0747     };
0748 
0749     debug("%s - entry slot # %d\n", __func__, slot_cur->number);
0750     if (SET_BUS_STATUS(slot_cur->ctrl) && is_bus_empty(slot_cur)) {
0751         rc = slot_update(&slot_cur);
0752         if (rc)
0753             return rc;
0754         speed = SLOT_SPEED(slot_cur->ext_status);
0755         debug("ext_status = %x, speed = %x\n", slot_cur->ext_status, speed);
0756         switch (speed) {
0757         case HPC_SLOT_SPEED_33:
0758             cmd = HPC_BUS_33CONVMODE;
0759             break;
0760         case HPC_SLOT_SPEED_66:
0761             if (SLOT_PCIX(slot_cur->ext_status)) {
0762                 if ((slot_cur->supported_speed >= BUS_SPEED_66) &&
0763                         (slot_cur->supported_bus_mode == BUS_MODE_PCIX))
0764                     cmd = HPC_BUS_66PCIXMODE;
0765                 else if (!SLOT_BUS_MODE(slot_cur->ext_status))
0766                     /* if max slot/bus capability is 66 pci
0767                     and there's no bus mode mismatch, then
0768                     the adapter supports 66 pci */
0769                     cmd = HPC_BUS_66CONVMODE;
0770                 else
0771                     cmd = HPC_BUS_33CONVMODE;
0772             } else {
0773                 if (slot_cur->supported_speed >= BUS_SPEED_66)
0774                     cmd = HPC_BUS_66CONVMODE;
0775                 else
0776                     cmd = HPC_BUS_33CONVMODE;
0777             }
0778             break;
0779         case HPC_SLOT_SPEED_133:
0780             switch (slot_cur->supported_speed) {
0781             case BUS_SPEED_33:
0782                 cmd = HPC_BUS_33CONVMODE;
0783                 break;
0784             case BUS_SPEED_66:
0785                 if (slot_cur->supported_bus_mode == BUS_MODE_PCIX)
0786                     cmd = HPC_BUS_66PCIXMODE;
0787                 else
0788                     cmd = HPC_BUS_66CONVMODE;
0789                 break;
0790             case BUS_SPEED_100:
0791                 cmd = HPC_BUS_100PCIXMODE;
0792                 break;
0793             case BUS_SPEED_133:
0794                 /* This is to take care of the bug in CIOBX chip */
0795                 if (pci_dev_present(ciobx))
0796                     ibmphp_hpc_writeslot(slot_cur,
0797                             HPC_BUS_100PCIXMODE);
0798                 cmd = HPC_BUS_133PCIXMODE;
0799                 break;
0800             default:
0801                 err("Wrong bus speed\n");
0802                 return -ENODEV;
0803             }
0804             break;
0805         default:
0806             err("wrong slot speed\n");
0807             return -ENODEV;
0808         }
0809         debug("setting bus speed for slot %d, cmd %x\n",
0810                         slot_cur->number, cmd);
0811         retval = ibmphp_hpc_writeslot(slot_cur, cmd);
0812         if (retval) {
0813             err("setting bus speed failed\n");
0814             return retval;
0815         }
0816         if (CTLR_RESULT(slot_cur->ctrl->status)) {
0817             err("command not completed successfully in set_bus\n");
0818             return -EIO;
0819         }
0820     }
0821     /* This is for x440, once Brandon fixes the firmware,
0822     will not need this delay */
0823     msleep(1000);
0824     debug("%s -Exit\n", __func__);
0825     return 0;
0826 }
0827 
0828 /* This routine checks the bus limitations that the slot is on from the BIOS.
0829  * This is used in deciding whether or not to power up the slot.
0830  * (electrical/spec limitations. For example, >1 133 MHz or >2 66 PCI cards on
0831  * same bus)
0832  * Parameters: slot
0833  * Returns: 0 = no limitations, -EINVAL = exceeded limitations on the bus
0834  */
0835 static int check_limitations(struct slot *slot_cur)
0836 {
0837     u8 i;
0838     struct slot *tmp_slot;
0839     u8 count = 0;
0840     u8 limitation = 0;
0841 
0842     for (i = slot_cur->bus_on->slot_min; i <= slot_cur->bus_on->slot_max; i++) {
0843         tmp_slot = ibmphp_get_slot_from_physical_num(i);
0844         if (!tmp_slot)
0845             return -ENODEV;
0846         if ((SLOT_PWRGD(tmp_slot->status)) &&
0847                     !(SLOT_CONNECT(tmp_slot->status)))
0848             count++;
0849     }
0850     get_cur_bus_info(&slot_cur);
0851     switch (slot_cur->bus_on->current_speed) {
0852     case BUS_SPEED_33:
0853         limitation = slot_cur->bus_on->slots_at_33_conv;
0854         break;
0855     case BUS_SPEED_66:
0856         if (slot_cur->bus_on->current_bus_mode == BUS_MODE_PCIX)
0857             limitation = slot_cur->bus_on->slots_at_66_pcix;
0858         else
0859             limitation = slot_cur->bus_on->slots_at_66_conv;
0860         break;
0861     case BUS_SPEED_100:
0862         limitation = slot_cur->bus_on->slots_at_100_pcix;
0863         break;
0864     case BUS_SPEED_133:
0865         limitation = slot_cur->bus_on->slots_at_133_pcix;
0866         break;
0867     }
0868 
0869     if ((count + 1) > limitation)
0870         return -EINVAL;
0871     return 0;
0872 }
0873 
0874 static inline void print_card_capability(struct slot *slot_cur)
0875 {
0876     info("capability of the card is ");
0877     if ((slot_cur->ext_status & CARD_INFO) == PCIX133)
0878         info("   133 MHz PCI-X\n");
0879     else if ((slot_cur->ext_status & CARD_INFO) == PCIX66)
0880         info("    66 MHz PCI-X\n");
0881     else if ((slot_cur->ext_status & CARD_INFO) == PCI66)
0882         info("    66 MHz PCI\n");
0883     else
0884         info("    33 MHz PCI\n");
0885 
0886 }
0887 
0888 /* This routine will power on the slot, configure the device(s) and find the
0889  * drivers for them.
0890  * Parameters: hotplug_slot
0891  * Returns: 0 or failure codes
0892  */
0893 static int enable_slot(struct hotplug_slot *hs)
0894 {
0895     int rc, i, rcpr;
0896     struct slot *slot_cur;
0897     u8 function;
0898     struct pci_func *tmp_func;
0899 
0900     ibmphp_lock_operations();
0901 
0902     debug("ENABLING SLOT........\n");
0903     slot_cur = to_slot(hs);
0904 
0905     rc = validate(slot_cur, ENABLE);
0906     if (rc) {
0907         err("validate function failed\n");
0908         goto error_nopower;
0909     }
0910 
0911     attn_LED_blink(slot_cur);
0912 
0913     rc = set_bus(slot_cur);
0914     if (rc) {
0915         err("was not able to set the bus\n");
0916         goto error_nopower;
0917     }
0918 
0919     /*-----------------debugging------------------------------*/
0920     get_cur_bus_info(&slot_cur);
0921     debug("the current bus speed right after set_bus = %x\n",
0922                     slot_cur->bus_on->current_speed);
0923     /*----------------------------------------------------------*/
0924 
0925     rc = check_limitations(slot_cur);
0926     if (rc) {
0927         err("Adding this card exceeds the limitations of this bus.\n");
0928         err("(i.e., >1 133MHz cards running on same bus, or >2 66 PCI cards running on same bus.\n");
0929         err("Try hot-adding into another bus\n");
0930         rc = -EINVAL;
0931         goto error_nopower;
0932     }
0933 
0934     rc = power_on(slot_cur);
0935 
0936     if (rc) {
0937         err("something wrong when powering up... please see below for details\n");
0938         /* need to turn off before on, otherwise, blinking overwrites */
0939         attn_off(slot_cur);
0940         attn_on(slot_cur);
0941         if (slot_update(&slot_cur)) {
0942             attn_off(slot_cur);
0943             attn_on(slot_cur);
0944             rc = -ENODEV;
0945             goto exit;
0946         }
0947         /* Check to see the error of why it failed */
0948         if ((SLOT_POWER(slot_cur->status)) &&
0949                     !(SLOT_PWRGD(slot_cur->status)))
0950             err("power fault occurred trying to power up\n");
0951         else if (SLOT_BUS_SPEED(slot_cur->status)) {
0952             err("bus speed mismatch occurred.  please check current bus speed and card capability\n");
0953             print_card_capability(slot_cur);
0954         } else if (SLOT_BUS_MODE(slot_cur->ext_status)) {
0955             err("bus mode mismatch occurred.  please check current bus mode and card capability\n");
0956             print_card_capability(slot_cur);
0957         }
0958         ibmphp_update_slot_info(slot_cur);
0959         goto exit;
0960     }
0961     debug("after power_on\n");
0962     /*-----------------------debugging---------------------------*/
0963     get_cur_bus_info(&slot_cur);
0964     debug("the current bus speed right after power_on = %x\n",
0965                     slot_cur->bus_on->current_speed);
0966     /*----------------------------------------------------------*/
0967 
0968     rc = slot_update(&slot_cur);
0969     if (rc)
0970         goto error_power;
0971 
0972     rc = -EINVAL;
0973     if (SLOT_POWER(slot_cur->status) && !(SLOT_PWRGD(slot_cur->status))) {
0974         err("power fault occurred trying to power up...\n");
0975         goto error_power;
0976     }
0977     if (SLOT_POWER(slot_cur->status) && (SLOT_BUS_SPEED(slot_cur->status))) {
0978         err("bus speed mismatch occurred.  please check current bus speed and card capability\n");
0979         print_card_capability(slot_cur);
0980         goto error_power;
0981     }
0982     /* Don't think this case will happen after above checks...
0983      * but just in case, for paranoia sake */
0984     if (!(SLOT_POWER(slot_cur->status))) {
0985         err("power on failed...\n");
0986         goto error_power;
0987     }
0988 
0989     slot_cur->func = kzalloc(sizeof(struct pci_func), GFP_KERNEL);
0990     if (!slot_cur->func) {
0991         /* do update_slot_info here? */
0992         rc = -ENOMEM;
0993         goto error_power;
0994     }
0995     slot_cur->func->busno = slot_cur->bus;
0996     slot_cur->func->device = slot_cur->device;
0997     for (i = 0; i < 4; i++)
0998         slot_cur->func->irq[i] = slot_cur->irq[i];
0999 
1000     debug("b4 configure_card, slot_cur->bus = %x, slot_cur->device = %x\n",
1001                     slot_cur->bus, slot_cur->device);
1002 
1003     if (ibmphp_configure_card(slot_cur->func, slot_cur->number)) {
1004         err("configure_card was unsuccessful...\n");
1005         /* true because don't need to actually deallocate resources,
1006          * just remove references */
1007         ibmphp_unconfigure_card(&slot_cur, 1);
1008         debug("after unconfigure_card\n");
1009         slot_cur->func = NULL;
1010         rc = -ENOMEM;
1011         goto error_power;
1012     }
1013 
1014     function = 0x00;
1015     do {
1016         tmp_func = ibm_slot_find(slot_cur->bus, slot_cur->func->device,
1017                             function++);
1018         if (tmp_func && !(tmp_func->dev))
1019             ibm_configure_device(tmp_func);
1020     } while (tmp_func);
1021 
1022     attn_off(slot_cur);
1023     if (slot_update(&slot_cur)) {
1024         rc = -EFAULT;
1025         goto exit;
1026     }
1027     ibmphp_print_test();
1028     rc = ibmphp_update_slot_info(slot_cur);
1029 exit:
1030     ibmphp_unlock_operations();
1031     return rc;
1032 
1033 error_nopower:
1034     attn_off(slot_cur); /* need to turn off if was blinking b4 */
1035     attn_on(slot_cur);
1036 error_cont:
1037     rcpr = slot_update(&slot_cur);
1038     if (rcpr) {
1039         rc = rcpr;
1040         goto exit;
1041     }
1042     ibmphp_update_slot_info(slot_cur);
1043     goto exit;
1044 
1045 error_power:
1046     attn_off(slot_cur); /* need to turn off if was blinking b4 */
1047     attn_on(slot_cur);
1048     rcpr = power_off(slot_cur);
1049     if (rcpr) {
1050         rc = rcpr;
1051         goto exit;
1052     }
1053     goto error_cont;
1054 }
1055 
1056 /**************************************************************
1057 * HOT REMOVING ADAPTER CARD                                   *
1058 * INPUT: POINTER TO THE HOTPLUG SLOT STRUCTURE                *
1059 * OUTPUT: SUCCESS 0 ; FAILURE: UNCONFIGURE , VALIDATE         *
1060 *       DISABLE POWER ,                               *
1061 **************************************************************/
1062 static int ibmphp_disable_slot(struct hotplug_slot *hotplug_slot)
1063 {
1064     struct slot *slot = to_slot(hotplug_slot);
1065     int rc;
1066 
1067     ibmphp_lock_operations();
1068     rc = ibmphp_do_disable_slot(slot);
1069     ibmphp_unlock_operations();
1070     return rc;
1071 }
1072 
1073 int ibmphp_do_disable_slot(struct slot *slot_cur)
1074 {
1075     int rc;
1076     u8 flag;
1077 
1078     debug("DISABLING SLOT...\n");
1079 
1080     if ((slot_cur == NULL) || (slot_cur->ctrl == NULL))
1081         return -ENODEV;
1082 
1083     flag = slot_cur->flag;
1084     slot_cur->flag = 1;
1085 
1086     if (flag == 1) {
1087         rc = validate(slot_cur, DISABLE);
1088             /* checking if powered off already & valid slot # */
1089         if (rc)
1090             goto error;
1091     }
1092     attn_LED_blink(slot_cur);
1093 
1094     if (slot_cur->func == NULL) {
1095         /* We need this for functions that were there on bootup */
1096         slot_cur->func = kzalloc(sizeof(struct pci_func), GFP_KERNEL);
1097         if (!slot_cur->func) {
1098             rc = -ENOMEM;
1099             goto error;
1100         }
1101         slot_cur->func->busno = slot_cur->bus;
1102         slot_cur->func->device = slot_cur->device;
1103     }
1104 
1105     ibm_unconfigure_device(slot_cur->func);
1106 
1107     /*
1108      * If we got here from latch suddenly opening on operating card or
1109      * a power fault, there's no power to the card, so cannot
1110      * read from it to determine what resources it occupied.  This operation
1111      * is forbidden anyhow.  The best we can do is remove it from kernel
1112      * lists at least */
1113 
1114     if (!flag) {
1115         attn_off(slot_cur);
1116         return 0;
1117     }
1118 
1119     rc = ibmphp_unconfigure_card(&slot_cur, 0);
1120     slot_cur->func = NULL;
1121     debug("in disable_slot. after unconfigure_card\n");
1122     if (rc) {
1123         err("could not unconfigure card.\n");
1124         goto error;
1125     }
1126 
1127     rc = ibmphp_hpc_writeslot(slot_cur, HPC_SLOT_OFF);
1128     if (rc)
1129         goto error;
1130 
1131     attn_off(slot_cur);
1132     rc = slot_update(&slot_cur);
1133     if (rc)
1134         goto exit;
1135 
1136     rc = ibmphp_update_slot_info(slot_cur);
1137     ibmphp_print_test();
1138 exit:
1139     return rc;
1140 
1141 error:
1142     /*  Need to turn off if was blinking b4 */
1143     attn_off(slot_cur);
1144     attn_on(slot_cur);
1145     if (slot_update(&slot_cur)) {
1146         rc = -EFAULT;
1147         goto exit;
1148     }
1149     if (flag)
1150         ibmphp_update_slot_info(slot_cur);
1151     goto exit;
1152 }
1153 
1154 const struct hotplug_slot_ops ibmphp_hotplug_slot_ops = {
1155     .set_attention_status =     set_attention_status,
1156     .enable_slot =          enable_slot,
1157     .disable_slot =         ibmphp_disable_slot,
1158     .hardware_test =        NULL,
1159     .get_power_status =     get_power_status,
1160     .get_attention_status =     get_attention_status,
1161     .get_latch_status =     get_latch_status,
1162     .get_adapter_status =       get_adapter_present,
1163 };
1164 
1165 static void ibmphp_unload(void)
1166 {
1167     free_slots();
1168     debug("after slots\n");
1169     ibmphp_free_resources();
1170     debug("after resources\n");
1171     ibmphp_free_bus_info_queue();
1172     debug("after bus info\n");
1173     ibmphp_free_ebda_hpc_queue();
1174     debug("after ebda hpc\n");
1175     ibmphp_free_ebda_pci_rsrc_queue();
1176     debug("after ebda pci rsrc\n");
1177     kfree(ibmphp_pci_bus);
1178 }
1179 
1180 static int __init ibmphp_init(void)
1181 {
1182     struct pci_bus *bus;
1183     int i = 0;
1184     int rc = 0;
1185 
1186     init_flag = 1;
1187 
1188     info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
1189 
1190     ibmphp_pci_bus = kmalloc(sizeof(*ibmphp_pci_bus), GFP_KERNEL);
1191     if (!ibmphp_pci_bus) {
1192         rc = -ENOMEM;
1193         goto exit;
1194     }
1195 
1196     bus = pci_find_bus(0, 0);
1197     if (!bus) {
1198         err("Can't find the root pci bus, can not continue\n");
1199         rc = -ENODEV;
1200         goto error;
1201     }
1202     memcpy(ibmphp_pci_bus, bus, sizeof(*ibmphp_pci_bus));
1203 
1204     ibmphp_debug = debug;
1205 
1206     for (i = 0; i < 16; i++)
1207         irqs[i] = 0;
1208 
1209     rc = ibmphp_access_ebda();
1210     if (rc)
1211         goto error;
1212     debug("after ibmphp_access_ebda()\n");
1213 
1214     rc = ibmphp_rsrc_init();
1215     if (rc)
1216         goto error;
1217     debug("AFTER Resource & EBDA INITIALIZATIONS\n");
1218 
1219     max_slots = get_max_slots();
1220 
1221     rc = ibmphp_register_pci();
1222     if (rc)
1223         goto error;
1224 
1225     if (init_ops()) {
1226         rc = -ENODEV;
1227         goto error;
1228     }
1229 
1230     ibmphp_print_test();
1231     rc = ibmphp_hpc_start_poll_thread();
1232     if (rc)
1233         goto error;
1234 
1235 exit:
1236     return rc;
1237 
1238 error:
1239     ibmphp_unload();
1240     goto exit;
1241 }
1242 
1243 static void __exit ibmphp_exit(void)
1244 {
1245     ibmphp_hpc_stop_poll_thread();
1246     debug("after polling\n");
1247     ibmphp_unload();
1248     debug("done\n");
1249 }
1250 
1251 module_init(ibmphp_init);
1252 module_exit(ibmphp_exit);
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