| // SPDX-License-Identifier: GPL-2.0+ |
| /* |
| * PCI Hot Plug Controller Driver for RPA-compliant PPC64 platform. |
| * Copyright (C) 2003 Linda Xie <lxie@us.ibm.com> |
| * |
| * All rights reserved. |
| * |
| * Send feedback to <lxie@us.ibm.com> |
| * |
| */ |
| #include <linux/kernel.h> |
| #include <linux/module.h> |
| #include <linux/moduleparam.h> |
| #include <linux/pci.h> |
| #include <linux/pci_hotplug.h> |
| #include <linux/smp.h> |
| #include <linux/init.h> |
| #include <linux/vmalloc.h> |
| #include <asm/firmware.h> |
| #include <asm/eeh.h> /* for eeh_add_device() */ |
| #include <asm/rtas.h> /* rtas_call */ |
| #include <asm/pci-bridge.h> /* for pci_controller */ |
| #include "../pci.h" /* for pci_add_new_bus */ |
| /* and pci_do_scan_bus */ |
| #include "rpaphp.h" |
| |
| bool rpaphp_debug; |
| LIST_HEAD(rpaphp_slot_head); |
| EXPORT_SYMBOL_GPL(rpaphp_slot_head); |
| |
| #define DRIVER_VERSION "0.1" |
| #define DRIVER_AUTHOR "Linda Xie <lxie@us.ibm.com>" |
| #define DRIVER_DESC "RPA HOT Plug PCI Controller Driver" |
| |
| #define MAX_LOC_CODE 128 |
| |
| MODULE_AUTHOR(DRIVER_AUTHOR); |
| MODULE_DESCRIPTION(DRIVER_DESC); |
| MODULE_LICENSE("GPL"); |
| |
| module_param_named(debug, rpaphp_debug, bool, 0644); |
| |
| /** |
| * set_attention_status - set attention LED |
| * @hotplug_slot: target &hotplug_slot |
| * @value: LED control value |
| * |
| * echo 0 > attention -- set LED OFF |
| * echo 1 > attention -- set LED ON |
| * echo 2 > attention -- set LED ID(identify, light is blinking) |
| */ |
| static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 value) |
| { |
| int rc; |
| struct slot *slot = to_slot(hotplug_slot); |
| |
| switch (value) { |
| case 0: |
| case 1: |
| case 2: |
| break; |
| default: |
| value = 1; |
| break; |
| } |
| |
| rc = rtas_set_indicator(DR_INDICATOR, slot->index, value); |
| if (!rc) |
| slot->attention_status = value; |
| |
| return rc; |
| } |
| |
| /** |
| * get_power_status - get power status of a slot |
| * @hotplug_slot: slot to get status |
| * @value: pointer to store status |
| */ |
| static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value) |
| { |
| int retval, level; |
| struct slot *slot = to_slot(hotplug_slot); |
| |
| retval = rtas_get_power_level(slot->power_domain, &level); |
| if (!retval) |
| *value = level; |
| return retval; |
| } |
| |
| /** |
| * get_attention_status - get attention LED status |
| * @hotplug_slot: slot to get status |
| * @value: pointer to store status |
| */ |
| static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 *value) |
| { |
| struct slot *slot = to_slot(hotplug_slot); |
| *value = slot->attention_status; |
| return 0; |
| } |
| |
| static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value) |
| { |
| struct slot *slot = to_slot(hotplug_slot); |
| int rc, state; |
| |
| rc = rpaphp_get_sensor_state(slot, &state); |
| |
| *value = NOT_VALID; |
| if (rc) |
| return rc; |
| |
| if (state == EMPTY) |
| *value = EMPTY; |
| else if (state == PRESENT) |
| *value = slot->state; |
| |
| return 0; |
| } |
| |
| static enum pci_bus_speed get_max_bus_speed(struct slot *slot) |
| { |
| enum pci_bus_speed speed; |
| switch (slot->type) { |
| case 1: |
| case 2: |
| case 3: |
| case 4: |
| case 5: |
| case 6: |
| speed = PCI_SPEED_33MHz; /* speed for case 1-6 */ |
| break; |
| case 7: |
| case 8: |
| speed = PCI_SPEED_66MHz; |
| break; |
| case 11: |
| case 14: |
| speed = PCI_SPEED_66MHz_PCIX; |
| break; |
| case 12: |
| case 15: |
| speed = PCI_SPEED_100MHz_PCIX; |
| break; |
| case 13: |
| case 16: |
| speed = PCI_SPEED_133MHz_PCIX; |
| break; |
| default: |
| speed = PCI_SPEED_UNKNOWN; |
| break; |
| } |
| |
| return speed; |
| } |
| |
| static int get_children_props(struct device_node *dn, const __be32 **drc_indexes, |
| const __be32 **drc_names, const __be32 **drc_types, |
| const __be32 **drc_power_domains) |
| { |
| const __be32 *indexes, *names, *types, *domains; |
| |
| indexes = of_get_property(dn, "ibm,drc-indexes", NULL); |
| names = of_get_property(dn, "ibm,drc-names", NULL); |
| types = of_get_property(dn, "ibm,drc-types", NULL); |
| domains = of_get_property(dn, "ibm,drc-power-domains", NULL); |
| |
| if (!indexes || !names || !types || !domains) { |
| /* Slot does not have dynamically-removable children */ |
| return -EINVAL; |
| } |
| if (drc_indexes) |
| *drc_indexes = indexes; |
| if (drc_names) |
| /* &drc_names[1] contains NULL terminated slot names */ |
| *drc_names = names; |
| if (drc_types) |
| /* &drc_types[1] contains NULL terminated slot types */ |
| *drc_types = types; |
| if (drc_power_domains) |
| *drc_power_domains = domains; |
| |
| return 0; |
| } |
| |
| |
| /* Verify the existence of 'drc_name' and/or 'drc_type' within the |
| * current node. First obtain it's my-drc-index property. Next, |
| * obtain the DRC info from it's parent. Use the my-drc-index for |
| * correlation, and obtain/validate the requested properties. |
| */ |
| |
| static int rpaphp_check_drc_props_v1(struct device_node *dn, char *drc_name, |
| char *drc_type, unsigned int my_index) |
| { |
| char *name_tmp, *type_tmp; |
| const __be32 *indexes, *names; |
| const __be32 *types, *domains; |
| int i, rc; |
| |
| rc = get_children_props(dn->parent, &indexes, &names, &types, &domains); |
| if (rc < 0) { |
| return -EINVAL; |
| } |
| |
| name_tmp = (char *) &names[1]; |
| type_tmp = (char *) &types[1]; |
| |
| /* Iterate through parent properties, looking for my-drc-index */ |
| for (i = 0; i < be32_to_cpu(indexes[0]); i++) { |
| if (be32_to_cpu(indexes[i + 1]) == my_index) |
| break; |
| |
| name_tmp += (strlen(name_tmp) + 1); |
| type_tmp += (strlen(type_tmp) + 1); |
| } |
| |
| if (((drc_name == NULL) || (drc_name && !strcmp(drc_name, name_tmp))) && |
| ((drc_type == NULL) || (drc_type && !strcmp(drc_type, type_tmp)))) |
| return 0; |
| |
| return -EINVAL; |
| } |
| |
| static int rpaphp_check_drc_props_v2(struct device_node *dn, char *drc_name, |
| char *drc_type, unsigned int my_index) |
| { |
| struct property *info; |
| unsigned int entries; |
| struct of_drc_info drc; |
| const __be32 *value; |
| char cell_drc_name[MAX_DRC_NAME_LEN]; |
| int j; |
| |
| info = of_find_property(dn->parent, "ibm,drc-info", NULL); |
| if (info == NULL) |
| return -EINVAL; |
| |
| value = of_prop_next_u32(info, NULL, &entries); |
| if (!value) |
| return -EINVAL; |
| else |
| value++; |
| |
| for (j = 0; j < entries; j++) { |
| of_read_drc_info_cell(&info, &value, &drc); |
| |
| /* Should now know end of current entry */ |
| |
| /* Found it */ |
| if (my_index >= drc.drc_index_start && my_index <= drc.last_drc_index) { |
| int index = my_index - drc.drc_index_start; |
| sprintf(cell_drc_name, "%s%d", drc.drc_name_prefix, |
| drc.drc_name_suffix_start + index); |
| break; |
| } |
| } |
| |
| if (((drc_name == NULL) || |
| (drc_name && !strcmp(drc_name, cell_drc_name))) && |
| ((drc_type == NULL) || |
| (drc_type && !strcmp(drc_type, drc.drc_type)))) |
| return 0; |
| |
| return -EINVAL; |
| } |
| |
| int rpaphp_check_drc_props(struct device_node *dn, char *drc_name, |
| char *drc_type) |
| { |
| const __be32 *my_index; |
| |
| my_index = of_get_property(dn, "ibm,my-drc-index", NULL); |
| if (!my_index) { |
| /* Node isn't DLPAR/hotplug capable */ |
| return -EINVAL; |
| } |
| |
| if (of_find_property(dn->parent, "ibm,drc-info", NULL)) |
| return rpaphp_check_drc_props_v2(dn, drc_name, drc_type, |
| be32_to_cpu(*my_index)); |
| else |
| return rpaphp_check_drc_props_v1(dn, drc_name, drc_type, |
| be32_to_cpu(*my_index)); |
| } |
| EXPORT_SYMBOL_GPL(rpaphp_check_drc_props); |
| |
| |
| static int is_php_type(char *drc_type) |
| { |
| unsigned long value; |
| char *endptr; |
| |
| /* PCI Hotplug nodes have an integer for drc_type */ |
| value = simple_strtoul(drc_type, &endptr, 10); |
| if (endptr == drc_type) |
| return 0; |
| |
| return 1; |
| } |
| |
| /** |
| * is_php_dn() - return 1 if this is a hotpluggable pci slot, else 0 |
| * @dn: target &device_node |
| * @indexes: passed to get_children_props() |
| * @names: passed to get_children_props() |
| * @types: returned from get_children_props() |
| * @power_domains: |
| * |
| * This routine will return true only if the device node is |
| * a hotpluggable slot. This routine will return false |
| * for built-in pci slots (even when the built-in slots are |
| * dlparable.) |
| */ |
| static int is_php_dn(struct device_node *dn, const __be32 **indexes, |
| const __be32 **names, const __be32 **types, |
| const __be32 **power_domains) |
| { |
| const __be32 *drc_types; |
| int rc; |
| |
| rc = get_children_props(dn, indexes, names, &drc_types, power_domains); |
| if (rc < 0) |
| return 0; |
| |
| if (!is_php_type((char *) &drc_types[1])) |
| return 0; |
| |
| *types = drc_types; |
| return 1; |
| } |
| |
| /** |
| * rpaphp_add_slot -- declare a hotplug slot to the hotplug subsystem. |
| * @dn: device node of slot |
| * |
| * This subroutine will register a hotpluggable slot with the |
| * PCI hotplug infrastructure. This routine is typically called |
| * during boot time, if the hotplug slots are present at boot time, |
| * or is called later, by the dlpar add code, if the slot is |
| * being dynamically added during runtime. |
| * |
| * If the device node points at an embedded (built-in) slot, this |
| * routine will just return without doing anything, since embedded |
| * slots cannot be hotplugged. |
| * |
| * To remove a slot, it suffices to call rpaphp_deregister_slot(). |
| */ |
| int rpaphp_add_slot(struct device_node *dn) |
| { |
| struct slot *slot; |
| int retval = 0; |
| int i; |
| const __be32 *indexes, *names, *types, *power_domains; |
| char *name, *type; |
| |
| if (!dn->name || strcmp(dn->name, "pci")) |
| return 0; |
| |
| /* If this is not a hotplug slot, return without doing anything. */ |
| if (!is_php_dn(dn, &indexes, &names, &types, &power_domains)) |
| return 0; |
| |
| dbg("Entry %s: dn=%pOF\n", __func__, dn); |
| |
| /* register PCI devices */ |
| name = (char *) &names[1]; |
| type = (char *) &types[1]; |
| for (i = 0; i < be32_to_cpu(indexes[0]); i++) { |
| int index; |
| |
| index = be32_to_cpu(indexes[i + 1]); |
| slot = alloc_slot_struct(dn, index, name, |
| be32_to_cpu(power_domains[i + 1])); |
| if (!slot) |
| return -ENOMEM; |
| |
| slot->type = simple_strtoul(type, NULL, 10); |
| |
| dbg("Found drc-index:0x%x drc-name:%s drc-type:%s\n", |
| index, name, type); |
| |
| retval = rpaphp_enable_slot(slot); |
| if (!retval) |
| retval = rpaphp_register_slot(slot); |
| |
| if (retval) |
| dealloc_slot_struct(slot); |
| |
| name += strlen(name) + 1; |
| type += strlen(type) + 1; |
| } |
| dbg("%s - Exit: rc[%d]\n", __func__, retval); |
| |
| /* XXX FIXME: reports a failure only if last entry in loop failed */ |
| return retval; |
| } |
| EXPORT_SYMBOL_GPL(rpaphp_add_slot); |
| |
| static void __exit cleanup_slots(void) |
| { |
| struct slot *slot, *next; |
| |
| /* |
| * Unregister all of our slots with the pci_hotplug subsystem, |
| * and free up all memory that we had allocated. |
| */ |
| |
| list_for_each_entry_safe(slot, next, &rpaphp_slot_head, |
| rpaphp_slot_list) { |
| list_del(&slot->rpaphp_slot_list); |
| pci_hp_deregister(&slot->hotplug_slot); |
| dealloc_slot_struct(slot); |
| } |
| } |
| |
| static int __init rpaphp_init(void) |
| { |
| struct device_node *dn; |
| |
| info(DRIVER_DESC " version: " DRIVER_VERSION "\n"); |
| |
| for_each_node_by_name(dn, "pci") |
| rpaphp_add_slot(dn); |
| |
| return 0; |
| } |
| |
| static void __exit rpaphp_exit(void) |
| { |
| cleanup_slots(); |
| } |
| |
| static int enable_slot(struct hotplug_slot *hotplug_slot) |
| { |
| struct slot *slot = to_slot(hotplug_slot); |
| int state; |
| int retval; |
| |
| if (slot->state == CONFIGURED) |
| return 0; |
| |
| retval = rpaphp_get_sensor_state(slot, &state); |
| if (retval) |
| return retval; |
| |
| if (state == PRESENT) { |
| pci_lock_rescan_remove(); |
| pci_hp_add_devices(slot->bus); |
| pci_unlock_rescan_remove(); |
| slot->state = CONFIGURED; |
| } else if (state == EMPTY) { |
| slot->state = EMPTY; |
| } else { |
| err("%s: slot[%s] is in invalid state\n", __func__, slot->name); |
| slot->state = NOT_VALID; |
| return -EINVAL; |
| } |
| |
| slot->bus->max_bus_speed = get_max_bus_speed(slot); |
| return 0; |
| } |
| |
| static int disable_slot(struct hotplug_slot *hotplug_slot) |
| { |
| struct slot *slot = to_slot(hotplug_slot); |
| if (slot->state == NOT_CONFIGURED) |
| return -EINVAL; |
| |
| pci_lock_rescan_remove(); |
| pci_hp_remove_devices(slot->bus); |
| pci_unlock_rescan_remove(); |
| vm_unmap_aliases(); |
| |
| slot->state = NOT_CONFIGURED; |
| return 0; |
| } |
| |
| const struct hotplug_slot_ops rpaphp_hotplug_slot_ops = { |
| .enable_slot = enable_slot, |
| .disable_slot = disable_slot, |
| .set_attention_status = set_attention_status, |
| .get_power_status = get_power_status, |
| .get_attention_status = get_attention_status, |
| .get_adapter_status = get_adapter_status, |
| }; |
| |
| module_init(rpaphp_init); |
| module_exit(rpaphp_exit); |