diff options
Diffstat (limited to 'drivers/pci/hotplug/pciehp_hpc.c')
| -rw-r--r-- | drivers/pci/hotplug/pciehp_hpc.c | 859 |
1 files changed, 859 insertions, 0 deletions
diff --git a/drivers/pci/hotplug/pciehp_hpc.c b/drivers/pci/hotplug/pciehp_hpc.c new file mode 100644 index 000000000..6d6868811 --- /dev/null +++ b/drivers/pci/hotplug/pciehp_hpc.c @@ -0,0 +1,859 @@ +/* + * PCI Express PCI Hot Plug Driver + * + * Copyright (C) 1995,2001 Compaq Computer Corporation + * Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com) + * Copyright (C) 2001 IBM Corp. + * Copyright (C) 2003-2004 Intel Corporation + * + * All rights reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or (at + * your option) any later version. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or + * NON INFRINGEMENT. See the GNU General Public License for more + * details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + * + * Send feedback to <greg@kroah.com>,<kristen.c.accardi@intel.com> + * + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/types.h> +#include <linux/signal.h> +#include <linux/jiffies.h> +#include <linux/timer.h> +#include <linux/pci.h> +#include <linux/interrupt.h> +#include <linux/time.h> +#include <linux/slab.h> + +#include "../pci.h" +#include "pciehp.h" + +static inline struct pci_dev *ctrl_dev(struct controller *ctrl) +{ + return ctrl->pcie->port; +} + +static irqreturn_t pcie_isr(int irq, void *dev_id); +static void start_int_poll_timer(struct controller *ctrl, int sec); + +/* This is the interrupt polling timeout function. */ +static void int_poll_timeout(unsigned long data) +{ + struct controller *ctrl = (struct controller *)data; + + /* Poll for interrupt events. regs == NULL => polling */ + pcie_isr(0, ctrl); + + init_timer(&ctrl->poll_timer); + if (!pciehp_poll_time) + pciehp_poll_time = 2; /* default polling interval is 2 sec */ + + start_int_poll_timer(ctrl, pciehp_poll_time); +} + +/* This function starts the interrupt polling timer. */ +static void start_int_poll_timer(struct controller *ctrl, int sec) +{ + /* Clamp to sane value */ + if ((sec <= 0) || (sec > 60)) + sec = 2; + + ctrl->poll_timer.function = &int_poll_timeout; + ctrl->poll_timer.data = (unsigned long)ctrl; + ctrl->poll_timer.expires = jiffies + sec * HZ; + add_timer(&ctrl->poll_timer); +} + +static inline int pciehp_request_irq(struct controller *ctrl) +{ + int retval, irq = ctrl->pcie->irq; + + /* Install interrupt polling timer. Start with 10 sec delay */ + if (pciehp_poll_mode) { + init_timer(&ctrl->poll_timer); + start_int_poll_timer(ctrl, 10); + return 0; + } + + /* Installs the interrupt handler */ + retval = request_irq(irq, pcie_isr, IRQF_SHARED, MY_NAME, ctrl); + if (retval) + ctrl_err(ctrl, "Cannot get irq %d for the hotplug controller\n", + irq); + return retval; +} + +static inline void pciehp_free_irq(struct controller *ctrl) +{ + if (pciehp_poll_mode) + del_timer_sync(&ctrl->poll_timer); + else + free_irq(ctrl->pcie->irq, ctrl); +} + +static int pcie_poll_cmd(struct controller *ctrl, int timeout) +{ + struct pci_dev *pdev = ctrl_dev(ctrl); + u16 slot_status; + + pcie_capability_read_word(pdev, PCI_EXP_SLTSTA, &slot_status); + if (slot_status & PCI_EXP_SLTSTA_CC) { + pcie_capability_write_word(pdev, PCI_EXP_SLTSTA, + PCI_EXP_SLTSTA_CC); + return 1; + } + while (timeout > 0) { + msleep(10); + timeout -= 10; + pcie_capability_read_word(pdev, PCI_EXP_SLTSTA, &slot_status); + if (slot_status & PCI_EXP_SLTSTA_CC) { + pcie_capability_write_word(pdev, PCI_EXP_SLTSTA, + PCI_EXP_SLTSTA_CC); + return 1; + } + } + return 0; /* timeout */ +} + +static void pcie_wait_cmd(struct controller *ctrl) +{ + unsigned int msecs = pciehp_poll_mode ? 2500 : 1000; + unsigned long duration = msecs_to_jiffies(msecs); + unsigned long cmd_timeout = ctrl->cmd_started + duration; + unsigned long now, timeout; + int rc; + + /* + * If the controller does not generate notifications for command + * completions, we never need to wait between writes. + */ + if (NO_CMD_CMPL(ctrl)) + return; + + if (!ctrl->cmd_busy) + return; + + /* + * Even if the command has already timed out, we want to call + * pcie_poll_cmd() so it can clear PCI_EXP_SLTSTA_CC. + */ + now = jiffies; + if (time_before_eq(cmd_timeout, now)) + timeout = 1; + else + timeout = cmd_timeout - now; + + if (ctrl->slot_ctrl & PCI_EXP_SLTCTL_HPIE && + ctrl->slot_ctrl & PCI_EXP_SLTCTL_CCIE) + rc = wait_event_timeout(ctrl->queue, !ctrl->cmd_busy, timeout); + else + rc = pcie_poll_cmd(ctrl, jiffies_to_msecs(timeout)); + + /* + * Controllers with errata like Intel CF118 don't generate + * completion notifications unless the power/indicator/interlock + * control bits are changed. On such controllers, we'll emit this + * timeout message when we wait for completion of commands that + * don't change those bits, e.g., commands that merely enable + * interrupts. + */ + if (!rc) + ctrl_info(ctrl, "Timeout on hotplug command %#06x (issued %u msec ago)\n", + ctrl->slot_ctrl, + jiffies_to_msecs(jiffies - ctrl->cmd_started)); +} + +static void pcie_do_write_cmd(struct controller *ctrl, u16 cmd, + u16 mask, bool wait) +{ + struct pci_dev *pdev = ctrl_dev(ctrl); + u16 slot_ctrl; + + mutex_lock(&ctrl->ctrl_lock); + + /* + * Always wait for any previous command that might still be in progress + */ + pcie_wait_cmd(ctrl); + + pcie_capability_read_word(pdev, PCI_EXP_SLTCTL, &slot_ctrl); + slot_ctrl &= ~mask; + slot_ctrl |= (cmd & mask); + ctrl->cmd_busy = 1; + smp_mb(); + pcie_capability_write_word(pdev, PCI_EXP_SLTCTL, slot_ctrl); + ctrl->cmd_started = jiffies; + ctrl->slot_ctrl = slot_ctrl; + + /* + * Optionally wait for the hardware to be ready for a new command, + * indicating completion of the above issued command. + */ + if (wait) + pcie_wait_cmd(ctrl); + + mutex_unlock(&ctrl->ctrl_lock); +} + +/** + * pcie_write_cmd - Issue controller command + * @ctrl: controller to which the command is issued + * @cmd: command value written to slot control register + * @mask: bitmask of slot control register to be modified + */ +static void pcie_write_cmd(struct controller *ctrl, u16 cmd, u16 mask) +{ + pcie_do_write_cmd(ctrl, cmd, mask, true); +} + +/* Same as above without waiting for the hardware to latch */ +static void pcie_write_cmd_nowait(struct controller *ctrl, u16 cmd, u16 mask) +{ + pcie_do_write_cmd(ctrl, cmd, mask, false); +} + +bool pciehp_check_link_active(struct controller *ctrl) +{ + struct pci_dev *pdev = ctrl_dev(ctrl); + u16 lnk_status; + bool ret; + + pcie_capability_read_word(pdev, PCI_EXP_LNKSTA, &lnk_status); + ret = !!(lnk_status & PCI_EXP_LNKSTA_DLLLA); + + if (ret) + ctrl_dbg(ctrl, "%s: lnk_status = %x\n", __func__, lnk_status); + + return ret; +} + +static void __pcie_wait_link_active(struct controller *ctrl, bool active) +{ + int timeout = 1000; + + if (pciehp_check_link_active(ctrl) == active) + return; + while (timeout > 0) { + msleep(10); + timeout -= 10; + if (pciehp_check_link_active(ctrl) == active) + return; + } + ctrl_dbg(ctrl, "Data Link Layer Link Active not %s in 1000 msec\n", + active ? "set" : "cleared"); +} + +static void pcie_wait_link_active(struct controller *ctrl) +{ + __pcie_wait_link_active(ctrl, true); +} + +static bool pci_bus_check_dev(struct pci_bus *bus, int devfn) +{ + u32 l; + int count = 0; + int delay = 1000, step = 20; + bool found = false; + + do { + found = pci_bus_read_dev_vendor_id(bus, devfn, &l, 0); + count++; + + if (found) + break; + + msleep(step); + delay -= step; + } while (delay > 0); + + if (count > 1 && pciehp_debug) + printk(KERN_DEBUG "pci %04x:%02x:%02x.%d id reading try %d times with interval %d ms to get %08x\n", + pci_domain_nr(bus), bus->number, PCI_SLOT(devfn), + PCI_FUNC(devfn), count, step, l); + + return found; +} + +int pciehp_check_link_status(struct controller *ctrl) +{ + struct pci_dev *pdev = ctrl_dev(ctrl); + bool found; + u16 lnk_status; + + /* + * Data Link Layer Link Active Reporting must be capable for + * hot-plug capable downstream port. But old controller might + * not implement it. In this case, we wait for 1000 ms. + */ + if (ctrl->link_active_reporting) + pcie_wait_link_active(ctrl); + else + msleep(1000); + + /* wait 100ms before read pci conf, and try in 1s */ + msleep(100); + found = pci_bus_check_dev(ctrl->pcie->port->subordinate, + PCI_DEVFN(0, 0)); + + pcie_capability_read_word(pdev, PCI_EXP_LNKSTA, &lnk_status); + ctrl_dbg(ctrl, "%s: lnk_status = %x\n", __func__, lnk_status); + if ((lnk_status & PCI_EXP_LNKSTA_LT) || + !(lnk_status & PCI_EXP_LNKSTA_NLW)) { + ctrl_err(ctrl, "Link Training Error occurs\n"); + return -1; + } + + pcie_update_link_speed(ctrl->pcie->port->subordinate, lnk_status); + + if (!found) + return -1; + + return 0; +} + +static int __pciehp_link_set(struct controller *ctrl, bool enable) +{ + struct pci_dev *pdev = ctrl_dev(ctrl); + u16 lnk_ctrl; + + pcie_capability_read_word(pdev, PCI_EXP_LNKCTL, &lnk_ctrl); + + if (enable) + lnk_ctrl &= ~PCI_EXP_LNKCTL_LD; + else + lnk_ctrl |= PCI_EXP_LNKCTL_LD; + + pcie_capability_write_word(pdev, PCI_EXP_LNKCTL, lnk_ctrl); + ctrl_dbg(ctrl, "%s: lnk_ctrl = %x\n", __func__, lnk_ctrl); + return 0; +} + +static int pciehp_link_enable(struct controller *ctrl) +{ + return __pciehp_link_set(ctrl, true); +} + +void pciehp_get_attention_status(struct slot *slot, u8 *status) +{ + struct controller *ctrl = slot->ctrl; + struct pci_dev *pdev = ctrl_dev(ctrl); + u16 slot_ctrl; + + pcie_capability_read_word(pdev, PCI_EXP_SLTCTL, &slot_ctrl); + ctrl_dbg(ctrl, "%s: SLOTCTRL %x, value read %x\n", __func__, + pci_pcie_cap(ctrl->pcie->port) + PCI_EXP_SLTCTL, slot_ctrl); + + switch (slot_ctrl & PCI_EXP_SLTCTL_AIC) { + case PCI_EXP_SLTCTL_ATTN_IND_ON: + *status = 1; /* On */ + break; + case PCI_EXP_SLTCTL_ATTN_IND_BLINK: + *status = 2; /* Blink */ + break; + case PCI_EXP_SLTCTL_ATTN_IND_OFF: + *status = 0; /* Off */ + break; + default: + *status = 0xFF; + break; + } +} + +void pciehp_get_power_status(struct slot *slot, u8 *status) +{ + struct controller *ctrl = slot->ctrl; + struct pci_dev *pdev = ctrl_dev(ctrl); + u16 slot_ctrl; + + pcie_capability_read_word(pdev, PCI_EXP_SLTCTL, &slot_ctrl); + ctrl_dbg(ctrl, "%s: SLOTCTRL %x value read %x\n", __func__, + pci_pcie_cap(ctrl->pcie->port) + PCI_EXP_SLTCTL, slot_ctrl); + + switch (slot_ctrl & PCI_EXP_SLTCTL_PCC) { + case PCI_EXP_SLTCTL_PWR_ON: + *status = 1; /* On */ + break; + case PCI_EXP_SLTCTL_PWR_OFF: + *status = 0; /* Off */ + break; + default: + *status = 0xFF; + break; + } +} + +void pciehp_get_latch_status(struct slot *slot, u8 *status) +{ + struct pci_dev *pdev = ctrl_dev(slot->ctrl); + u16 slot_status; + + pcie_capability_read_word(pdev, PCI_EXP_SLTSTA, &slot_status); + *status = !!(slot_status & PCI_EXP_SLTSTA_MRLSS); +} + +void pciehp_get_adapter_status(struct slot *slot, u8 *status) +{ + struct pci_dev *pdev = ctrl_dev(slot->ctrl); + u16 slot_status; + + pcie_capability_read_word(pdev, PCI_EXP_SLTSTA, &slot_status); + *status = !!(slot_status & PCI_EXP_SLTSTA_PDS); +} + +int pciehp_query_power_fault(struct slot *slot) +{ + struct pci_dev *pdev = ctrl_dev(slot->ctrl); + u16 slot_status; + + pcie_capability_read_word(pdev, PCI_EXP_SLTSTA, &slot_status); + return !!(slot_status & PCI_EXP_SLTSTA_PFD); +} + +void pciehp_set_attention_status(struct slot *slot, u8 value) +{ + struct controller *ctrl = slot->ctrl; + u16 slot_cmd; + + if (!ATTN_LED(ctrl)) + return; + + switch (value) { + case 0: /* turn off */ + slot_cmd = PCI_EXP_SLTCTL_ATTN_IND_OFF; + break; + case 1: /* turn on */ + slot_cmd = PCI_EXP_SLTCTL_ATTN_IND_ON; + break; + case 2: /* turn blink */ + slot_cmd = PCI_EXP_SLTCTL_ATTN_IND_BLINK; + break; + default: + return; + } + pcie_write_cmd_nowait(ctrl, slot_cmd, PCI_EXP_SLTCTL_AIC); + ctrl_dbg(ctrl, "%s: SLOTCTRL %x write cmd %x\n", __func__, + pci_pcie_cap(ctrl->pcie->port) + PCI_EXP_SLTCTL, slot_cmd); +} + +void pciehp_green_led_on(struct slot *slot) +{ + struct controller *ctrl = slot->ctrl; + + if (!PWR_LED(ctrl)) + return; + + pcie_write_cmd_nowait(ctrl, PCI_EXP_SLTCTL_PWR_IND_ON, + PCI_EXP_SLTCTL_PIC); + ctrl_dbg(ctrl, "%s: SLOTCTRL %x write cmd %x\n", __func__, + pci_pcie_cap(ctrl->pcie->port) + PCI_EXP_SLTCTL, + PCI_EXP_SLTCTL_PWR_IND_ON); +} + +void pciehp_green_led_off(struct slot *slot) +{ + struct controller *ctrl = slot->ctrl; + + if (!PWR_LED(ctrl)) + return; + + pcie_write_cmd_nowait(ctrl, PCI_EXP_SLTCTL_PWR_IND_OFF, + PCI_EXP_SLTCTL_PIC); + ctrl_dbg(ctrl, "%s: SLOTCTRL %x write cmd %x\n", __func__, + pci_pcie_cap(ctrl->pcie->port) + PCI_EXP_SLTCTL, + PCI_EXP_SLTCTL_PWR_IND_OFF); +} + +void pciehp_green_led_blink(struct slot *slot) +{ + struct controller *ctrl = slot->ctrl; + + if (!PWR_LED(ctrl)) + return; + + pcie_write_cmd_nowait(ctrl, PCI_EXP_SLTCTL_PWR_IND_BLINK, + PCI_EXP_SLTCTL_PIC); + ctrl_dbg(ctrl, "%s: SLOTCTRL %x write cmd %x\n", __func__, + pci_pcie_cap(ctrl->pcie->port) + PCI_EXP_SLTCTL, + PCI_EXP_SLTCTL_PWR_IND_BLINK); +} + +int pciehp_power_on_slot(struct slot *slot) +{ + struct controller *ctrl = slot->ctrl; + struct pci_dev *pdev = ctrl_dev(ctrl); + u16 slot_status; + int retval; + + /* Clear sticky power-fault bit from previous power failures */ + pcie_capability_read_word(pdev, PCI_EXP_SLTSTA, &slot_status); + if (slot_status & PCI_EXP_SLTSTA_PFD) + pcie_capability_write_word(pdev, PCI_EXP_SLTSTA, + PCI_EXP_SLTSTA_PFD); + ctrl->power_fault_detected = 0; + + pcie_write_cmd(ctrl, PCI_EXP_SLTCTL_PWR_ON, PCI_EXP_SLTCTL_PCC); + ctrl_dbg(ctrl, "%s: SLOTCTRL %x write cmd %x\n", __func__, + pci_pcie_cap(ctrl->pcie->port) + PCI_EXP_SLTCTL, + PCI_EXP_SLTCTL_PWR_ON); + + retval = pciehp_link_enable(ctrl); + if (retval) + ctrl_err(ctrl, "%s: Can not enable the link!\n", __func__); + + return retval; +} + +void pciehp_power_off_slot(struct slot *slot) +{ + struct controller *ctrl = slot->ctrl; + + pcie_write_cmd(ctrl, PCI_EXP_SLTCTL_PWR_OFF, PCI_EXP_SLTCTL_PCC); + ctrl_dbg(ctrl, "%s: SLOTCTRL %x write cmd %x\n", __func__, + pci_pcie_cap(ctrl->pcie->port) + PCI_EXP_SLTCTL, + PCI_EXP_SLTCTL_PWR_OFF); +} + +static irqreturn_t pcie_isr(int irq, void *dev_id) +{ + struct controller *ctrl = (struct controller *)dev_id; + struct pci_dev *pdev = ctrl_dev(ctrl); + struct pci_bus *subordinate = pdev->subordinate; + struct pci_dev *dev; + struct slot *slot = ctrl->slot; + u16 detected, intr_loc; + + /* + * In order to guarantee that all interrupt events are + * serviced, we need to re-inspect Slot Status register after + * clearing what is presumed to be the last pending interrupt. + */ + intr_loc = 0; + do { + pcie_capability_read_word(pdev, PCI_EXP_SLTSTA, &detected); + + detected &= (PCI_EXP_SLTSTA_ABP | PCI_EXP_SLTSTA_PFD | + PCI_EXP_SLTSTA_MRLSC | PCI_EXP_SLTSTA_PDC | + PCI_EXP_SLTSTA_CC | PCI_EXP_SLTSTA_DLLSC); + detected &= ~intr_loc; + intr_loc |= detected; + if (!intr_loc) + return IRQ_NONE; + if (detected) + pcie_capability_write_word(pdev, PCI_EXP_SLTSTA, + intr_loc); + } while (detected); + + ctrl_dbg(ctrl, "%s: intr_loc %x\n", __func__, intr_loc); + + /* Check Command Complete Interrupt Pending */ + if (intr_loc & PCI_EXP_SLTSTA_CC) { + ctrl->cmd_busy = 0; + smp_mb(); + wake_up(&ctrl->queue); + } + + if (subordinate) { + list_for_each_entry(dev, &subordinate->devices, bus_list) { + if (dev->ignore_hotplug) { + ctrl_dbg(ctrl, "ignoring hotplug event %#06x (%s requested no hotplug)\n", + intr_loc, pci_name(dev)); + return IRQ_HANDLED; + } + } + } + + if (!(intr_loc & ~PCI_EXP_SLTSTA_CC)) + return IRQ_HANDLED; + + /* Check MRL Sensor Changed */ + if (intr_loc & PCI_EXP_SLTSTA_MRLSC) + pciehp_handle_switch_change(slot); + + /* Check Attention Button Pressed */ + if (intr_loc & PCI_EXP_SLTSTA_ABP) + pciehp_handle_attention_button(slot); + + /* Check Presence Detect Changed */ + if (intr_loc & PCI_EXP_SLTSTA_PDC) + pciehp_handle_presence_change(slot); + + /* Check Power Fault Detected */ + if ((intr_loc & PCI_EXP_SLTSTA_PFD) && !ctrl->power_fault_detected) { + ctrl->power_fault_detected = 1; + pciehp_handle_power_fault(slot); + } + + if (intr_loc & PCI_EXP_SLTSTA_DLLSC) + pciehp_handle_linkstate_change(slot); + + return IRQ_HANDLED; +} + +void pcie_enable_notification(struct controller *ctrl) +{ + u16 cmd, mask; + + /* + * TBD: Power fault detected software notification support. + * + * Power fault detected software notification is not enabled + * now, because it caused power fault detected interrupt storm + * on some machines. On those machines, power fault detected + * bit in the slot status register was set again immediately + * when it is cleared in the interrupt service routine, and + * next power fault detected interrupt was notified again. + */ + + /* + * Always enable link events: thus link-up and link-down shall + * always be treated as hotplug and unplug respectively. Enable + * presence detect only if Attention Button is not present. + */ + cmd = PCI_EXP_SLTCTL_DLLSCE; + if (ATTN_BUTTN(ctrl)) + cmd |= PCI_EXP_SLTCTL_ABPE; + else + cmd |= PCI_EXP_SLTCTL_PDCE; + if (MRL_SENS(ctrl)) + cmd |= PCI_EXP_SLTCTL_MRLSCE; + if (!pciehp_poll_mode) + cmd |= PCI_EXP_SLTCTL_HPIE | PCI_EXP_SLTCTL_CCIE; + + mask = (PCI_EXP_SLTCTL_PDCE | PCI_EXP_SLTCTL_ABPE | + PCI_EXP_SLTCTL_MRLSCE | PCI_EXP_SLTCTL_PFDE | + PCI_EXP_SLTCTL_HPIE | PCI_EXP_SLTCTL_CCIE | + PCI_EXP_SLTCTL_DLLSCE); + + pcie_write_cmd_nowait(ctrl, cmd, mask); + ctrl_dbg(ctrl, "%s: SLOTCTRL %x write cmd %x\n", __func__, + pci_pcie_cap(ctrl->pcie->port) + PCI_EXP_SLTCTL, cmd); +} + +static void pcie_disable_notification(struct controller *ctrl) +{ + u16 mask; + + mask = (PCI_EXP_SLTCTL_PDCE | PCI_EXP_SLTCTL_ABPE | + PCI_EXP_SLTCTL_MRLSCE | PCI_EXP_SLTCTL_PFDE | + PCI_EXP_SLTCTL_HPIE | PCI_EXP_SLTCTL_CCIE | + PCI_EXP_SLTCTL_DLLSCE); + pcie_write_cmd(ctrl, 0, mask); + ctrl_dbg(ctrl, "%s: SLOTCTRL %x write cmd %x\n", __func__, + pci_pcie_cap(ctrl->pcie->port) + PCI_EXP_SLTCTL, 0); +} + +/* + * pciehp has a 1:1 bus:slot relationship so we ultimately want a secondary + * bus reset of the bridge, but at the same time we want to ensure that it is + * not seen as a hot-unplug, followed by the hot-plug of the device. Thus, + * disable link state notification and presence detection change notification + * momentarily, if we see that they could interfere. Also, clear any spurious + * events after. + */ +int pciehp_reset_slot(struct slot *slot, int probe) +{ + struct controller *ctrl = slot->ctrl; + struct pci_dev *pdev = ctrl_dev(ctrl); + u16 stat_mask = 0, ctrl_mask = 0; + + if (probe) + return 0; + + if (!ATTN_BUTTN(ctrl)) { + ctrl_mask |= PCI_EXP_SLTCTL_PDCE; + stat_mask |= PCI_EXP_SLTSTA_PDC; + } + ctrl_mask |= PCI_EXP_SLTCTL_DLLSCE; + stat_mask |= PCI_EXP_SLTSTA_DLLSC; + + pcie_write_cmd(ctrl, 0, ctrl_mask); + ctrl_dbg(ctrl, "%s: SLOTCTRL %x write cmd %x\n", __func__, + pci_pcie_cap(ctrl->pcie->port) + PCI_EXP_SLTCTL, 0); + if (pciehp_poll_mode) + del_timer_sync(&ctrl->poll_timer); + + pci_reset_bridge_secondary_bus(ctrl->pcie->port); + + pcie_capability_write_word(pdev, PCI_EXP_SLTSTA, stat_mask); + pcie_write_cmd_nowait(ctrl, ctrl_mask, ctrl_mask); + ctrl_dbg(ctrl, "%s: SLOTCTRL %x write cmd %x\n", __func__, + pci_pcie_cap(ctrl->pcie->port) + PCI_EXP_SLTCTL, ctrl_mask); + if (pciehp_poll_mode) + int_poll_timeout(ctrl->poll_timer.data); + + return 0; +} + +int pcie_init_notification(struct controller *ctrl) +{ + if (pciehp_request_irq(ctrl)) + return -1; + pcie_enable_notification(ctrl); + ctrl->notification_enabled = 1; + return 0; +} + +static void pcie_shutdown_notification(struct controller *ctrl) +{ + if (ctrl->notification_enabled) { + pcie_disable_notification(ctrl); + pciehp_free_irq(ctrl); + ctrl->notification_enabled = 0; + } +} + +static int pcie_init_slot(struct controller *ctrl) +{ + struct slot *slot; + + slot = kzalloc(sizeof(*slot), GFP_KERNEL); + if (!slot) + return -ENOMEM; + + slot->wq = alloc_workqueue("pciehp-%u", 0, 0, PSN(ctrl)); + if (!slot->wq) + goto abort; + + slot->ctrl = ctrl; + mutex_init(&slot->lock); + mutex_init(&slot->hotplug_lock); + INIT_DELAYED_WORK(&slot->work, pciehp_queue_pushbutton_work); + ctrl->slot = slot; + return 0; +abort: + kfree(slot); + return -ENOMEM; +} + +static void pcie_cleanup_slot(struct controller *ctrl) +{ + struct slot *slot = ctrl->slot; + cancel_delayed_work(&slot->work); + destroy_workqueue(slot->wq); + kfree(slot); +} + +static inline void dbg_ctrl(struct controller *ctrl) +{ + int i; + u16 reg16; + struct pci_dev *pdev = ctrl->pcie->port; + + if (!pciehp_debug) + return; + + ctrl_info(ctrl, "Hotplug Controller:\n"); + ctrl_info(ctrl, " Seg/Bus/Dev/Func/IRQ : %s IRQ %d\n", + pci_name(pdev), pdev->irq); + ctrl_info(ctrl, " Vendor ID : 0x%04x\n", pdev->vendor); + ctrl_info(ctrl, " Device ID : 0x%04x\n", pdev->device); + ctrl_info(ctrl, " Subsystem ID : 0x%04x\n", + pdev->subsystem_device); + ctrl_info(ctrl, " Subsystem Vendor ID : 0x%04x\n", + pdev->subsystem_vendor); + ctrl_info(ctrl, " PCIe Cap offset : 0x%02x\n", + pci_pcie_cap(pdev)); + for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) { + if (!pci_resource_len(pdev, i)) + continue; + ctrl_info(ctrl, " PCI resource [%d] : %pR\n", + i, &pdev->resource[i]); + } + ctrl_info(ctrl, "Slot Capabilities : 0x%08x\n", ctrl->slot_cap); + ctrl_info(ctrl, " Physical Slot Number : %d\n", PSN(ctrl)); + ctrl_info(ctrl, " Attention Button : %3s\n", + ATTN_BUTTN(ctrl) ? "yes" : "no"); + ctrl_info(ctrl, " Power Controller : %3s\n", + POWER_CTRL(ctrl) ? "yes" : "no"); + ctrl_info(ctrl, " MRL Sensor : %3s\n", + MRL_SENS(ctrl) ? "yes" : "no"); + ctrl_info(ctrl, " Attention Indicator : %3s\n", + ATTN_LED(ctrl) ? "yes" : "no"); + ctrl_info(ctrl, " Power Indicator : %3s\n", + PWR_LED(ctrl) ? "yes" : "no"); + ctrl_info(ctrl, " Hot-Plug Surprise : %3s\n", + HP_SUPR_RM(ctrl) ? "yes" : "no"); + ctrl_info(ctrl, " EMI Present : %3s\n", + EMI(ctrl) ? "yes" : "no"); + ctrl_info(ctrl, " Command Completed : %3s\n", + NO_CMD_CMPL(ctrl) ? "no" : "yes"); + pcie_capability_read_word(pdev, PCI_EXP_SLTSTA, ®16); + ctrl_info(ctrl, "Slot Status : 0x%04x\n", reg16); + pcie_capability_read_word(pdev, PCI_EXP_SLTCTL, ®16); + ctrl_info(ctrl, "Slot Control : 0x%04x\n", reg16); +} + +#define FLAG(x, y) (((x) & (y)) ? '+' : '-') + +struct controller *pcie_init(struct pcie_device *dev) +{ + struct controller *ctrl; + u32 slot_cap, link_cap; + struct pci_dev *pdev = dev->port; + + ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL); + if (!ctrl) { + dev_err(&dev->device, "%s: Out of memory\n", __func__); + goto abort; + } + ctrl->pcie = dev; + pcie_capability_read_dword(pdev, PCI_EXP_SLTCAP, &slot_cap); + ctrl->slot_cap = slot_cap; + mutex_init(&ctrl->ctrl_lock); + init_waitqueue_head(&ctrl->queue); + dbg_ctrl(ctrl); + + /* Check if Data Link Layer Link Active Reporting is implemented */ + pcie_capability_read_dword(pdev, PCI_EXP_LNKCAP, &link_cap); + if (link_cap & PCI_EXP_LNKCAP_DLLLARC) { + ctrl_dbg(ctrl, "Link Active Reporting supported\n"); + ctrl->link_active_reporting = 1; + } + + /* Clear all remaining event bits in Slot Status register */ + pcie_capability_write_word(pdev, PCI_EXP_SLTSTA, + PCI_EXP_SLTSTA_ABP | PCI_EXP_SLTSTA_PFD | + PCI_EXP_SLTSTA_MRLSC | PCI_EXP_SLTSTA_PDC | + PCI_EXP_SLTSTA_CC | PCI_EXP_SLTSTA_DLLSC); + + ctrl_info(ctrl, "Slot #%d AttnBtn%c AttnInd%c PwrInd%c PwrCtrl%c MRL%c Interlock%c NoCompl%c LLActRep%c\n", + (slot_cap & PCI_EXP_SLTCAP_PSN) >> 19, + FLAG(slot_cap, PCI_EXP_SLTCAP_ABP), + FLAG(slot_cap, PCI_EXP_SLTCAP_AIP), + FLAG(slot_cap, PCI_EXP_SLTCAP_PIP), + FLAG(slot_cap, PCI_EXP_SLTCAP_PCP), + FLAG(slot_cap, PCI_EXP_SLTCAP_MRLSP), + FLAG(slot_cap, PCI_EXP_SLTCAP_EIP), + FLAG(slot_cap, PCI_EXP_SLTCAP_NCCS), + FLAG(link_cap, PCI_EXP_LNKCAP_DLLLARC)); + + if (pcie_init_slot(ctrl)) + goto abort_ctrl; + + return ctrl; + +abort_ctrl: + kfree(ctrl); +abort: + return NULL; +} + +void pciehp_release_ctrl(struct controller *ctrl) +{ + pcie_shutdown_notification(ctrl); + pcie_cleanup_slot(ctrl); + kfree(ctrl); +} |