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kernel_samsung_sm7125/drivers/pci/hotplug/shpchp_hpc.c

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/*
* Standard 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/pci.h>
#include <linux/interrupt.h>
#include "shpchp.h"
#ifdef DEBUG
#define DBG_K_TRACE_ENTRY ((unsigned int)0x00000001) /* On function entry */
#define DBG_K_TRACE_EXIT ((unsigned int)0x00000002) /* On function exit */
#define DBG_K_INFO ((unsigned int)0x00000004) /* Info messages */
#define DBG_K_ERROR ((unsigned int)0x00000008) /* Error messages */
#define DBG_K_TRACE (DBG_K_TRACE_ENTRY|DBG_K_TRACE_EXIT)
#define DBG_K_STANDARD (DBG_K_INFO|DBG_K_ERROR|DBG_K_TRACE)
/* Redefine this flagword to set debug level */
#define DEBUG_LEVEL DBG_K_STANDARD
#define DEFINE_DBG_BUFFER char __dbg_str_buf[256];
#define DBG_PRINT( dbg_flags, args... ) \
do { \
if ( DEBUG_LEVEL & ( dbg_flags ) ) \
{ \
int len; \
len = sprintf( __dbg_str_buf, "%s:%d: %s: ", \
__FILE__, __LINE__, __FUNCTION__ ); \
sprintf( __dbg_str_buf + len, args ); \
printk( KERN_NOTICE "%s\n", __dbg_str_buf ); \
} \
} while (0)
#define DBG_ENTER_ROUTINE DBG_PRINT (DBG_K_TRACE_ENTRY, "%s", "[Entry]");
#define DBG_LEAVE_ROUTINE DBG_PRINT (DBG_K_TRACE_EXIT, "%s", "[Exit]");
#else
#define DEFINE_DBG_BUFFER
#define DBG_ENTER_ROUTINE
#define DBG_LEAVE_ROUTINE
#endif /* DEBUG */
/* Slot Available Register I field definition */
#define SLOT_33MHZ 0x0000001f
#define SLOT_66MHZ_PCIX 0x00001f00
#define SLOT_100MHZ_PCIX 0x001f0000
#define SLOT_133MHZ_PCIX 0x1f000000
/* Slot Available Register II field definition */
#define SLOT_66MHZ 0x0000001f
#define SLOT_66MHZ_PCIX_266 0x00000f00
#define SLOT_100MHZ_PCIX_266 0x0000f000
#define SLOT_133MHZ_PCIX_266 0x000f0000
#define SLOT_66MHZ_PCIX_533 0x00f00000
#define SLOT_100MHZ_PCIX_533 0x0f000000
#define SLOT_133MHZ_PCIX_533 0xf0000000
/* Slot Configuration */
#define SLOT_NUM 0x0000001F
#define FIRST_DEV_NUM 0x00001F00
#define PSN 0x07FF0000
#define UPDOWN 0x20000000
#define MRLSENSOR 0x40000000
#define ATTN_BUTTON 0x80000000
/*
* Interrupt Locator Register definitions
*/
#define CMD_INTR_PENDING (1 << 0)
#define SLOT_INTR_PENDING(i) (1 << (i + 1))
/*
* Controller SERR-INT Register
*/
#define GLOBAL_INTR_MASK (1 << 0)
#define GLOBAL_SERR_MASK (1 << 1)
#define COMMAND_INTR_MASK (1 << 2)
#define ARBITER_SERR_MASK (1 << 3)
#define COMMAND_DETECTED (1 << 16)
#define ARBITER_DETECTED (1 << 17)
#define SERR_INTR_RSVDZ_MASK 0xfffc0000
/*
* Logical Slot Register definitions
*/
#define SLOT_REG(i) (SLOT1 + (4 * i))
#define SLOT_STATE_SHIFT (0)
#define SLOT_STATE_MASK (3 << 0)
#define SLOT_STATE_PWRONLY (1)
#define SLOT_STATE_ENABLED (2)
#define SLOT_STATE_DISABLED (3)
#define PWR_LED_STATE_SHIFT (2)
#define PWR_LED_STATE_MASK (3 << 2)
#define ATN_LED_STATE_SHIFT (4)
#define ATN_LED_STATE_MASK (3 << 4)
#define ATN_LED_STATE_ON (1)
#define ATN_LED_STATE_BLINK (2)
#define ATN_LED_STATE_OFF (3)
#define POWER_FAULT (1 << 6)
#define ATN_BUTTON (1 << 7)
#define MRL_SENSOR (1 << 8)
#define MHZ66_CAP (1 << 9)
#define PRSNT_SHIFT (10)
#define PRSNT_MASK (3 << 10)
#define PCIX_CAP_SHIFT (12)
#define PCIX_CAP_MASK_PI1 (3 << 12)
#define PCIX_CAP_MASK_PI2 (7 << 12)
#define PRSNT_CHANGE_DETECTED (1 << 16)
#define ISO_PFAULT_DETECTED (1 << 17)
#define BUTTON_PRESS_DETECTED (1 << 18)
#define MRL_CHANGE_DETECTED (1 << 19)
#define CON_PFAULT_DETECTED (1 << 20)
#define PRSNT_CHANGE_INTR_MASK (1 << 24)
#define ISO_PFAULT_INTR_MASK (1 << 25)
#define BUTTON_PRESS_INTR_MASK (1 << 26)
#define MRL_CHANGE_INTR_MASK (1 << 27)
#define CON_PFAULT_INTR_MASK (1 << 28)
#define MRL_CHANGE_SERR_MASK (1 << 29)
#define CON_PFAULT_SERR_MASK (1 << 30)
#define SLOT_REG_RSVDZ_MASK (1 << 15) | (7 << 21)
/*
* SHPC Command Code definitnions
*
* Slot Operation 00h - 3Fh
* Set Bus Segment Speed/Mode A 40h - 47h
* Power-Only All Slots 48h
* Enable All Slots 49h
* Set Bus Segment Speed/Mode B (PI=2) 50h - 5Fh
* Reserved Command Codes 60h - BFh
* Vendor Specific Commands C0h - FFh
*/
#define SET_SLOT_PWR 0x01 /* Slot Operation */
#define SET_SLOT_ENABLE 0x02
#define SET_SLOT_DISABLE 0x03
#define SET_PWR_ON 0x04
#define SET_PWR_BLINK 0x08
#define SET_PWR_OFF 0x0c
#define SET_ATTN_ON 0x10
#define SET_ATTN_BLINK 0x20
#define SET_ATTN_OFF 0x30
#define SETA_PCI_33MHZ 0x40 /* Set Bus Segment Speed/Mode A */
#define SETA_PCI_66MHZ 0x41
#define SETA_PCIX_66MHZ 0x42
#define SETA_PCIX_100MHZ 0x43
#define SETA_PCIX_133MHZ 0x44
#define SETA_RESERVED1 0x45
#define SETA_RESERVED2 0x46
#define SETA_RESERVED3 0x47
#define SET_PWR_ONLY_ALL 0x48 /* Power-Only All Slots */
#define SET_ENABLE_ALL 0x49 /* Enable All Slots */
#define SETB_PCI_33MHZ 0x50 /* Set Bus Segment Speed/Mode B */
#define SETB_PCI_66MHZ 0x51
#define SETB_PCIX_66MHZ_PM 0x52
#define SETB_PCIX_100MHZ_PM 0x53
#define SETB_PCIX_133MHZ_PM 0x54
#define SETB_PCIX_66MHZ_EM 0x55
#define SETB_PCIX_100MHZ_EM 0x56
#define SETB_PCIX_133MHZ_EM 0x57
#define SETB_PCIX_66MHZ_266 0x58
#define SETB_PCIX_100MHZ_266 0x59
#define SETB_PCIX_133MHZ_266 0x5a
#define SETB_PCIX_66MHZ_533 0x5b
#define SETB_PCIX_100MHZ_533 0x5c
#define SETB_PCIX_133MHZ_533 0x5d
#define SETB_RESERVED1 0x5e
#define SETB_RESERVED2 0x5f
/*
* SHPC controller command error code
*/
#define SWITCH_OPEN 0x1
#define INVALID_CMD 0x2
#define INVALID_SPEED_MODE 0x4
/*
* For accessing SHPC Working Register Set via PCI Configuration Space
*/
#define DWORD_SELECT 0x2
#define DWORD_DATA 0x4
/* Field Offset in Logical Slot Register - byte boundary */
#define SLOT_EVENT_LATCH 0x2
#define SLOT_SERR_INT_MASK 0x3
DEFINE_DBG_BUFFER /* Debug string buffer for entire HPC defined here */
static struct php_ctlr_state_s *php_ctlr_list_head; /* HPC state linked list */
static int ctlr_seq_num = 0; /* Controller sequenc # */
static spinlock_t list_lock;
static atomic_t shpchp_num_controllers = ATOMIC_INIT(0);
static irqreturn_t shpc_isr(int irq, void *dev_id, struct pt_regs *regs);
static void start_int_poll_timer(struct php_ctlr_state_s *php_ctlr, int sec);
static int hpc_check_cmd_status(struct controller *ctrl);
static inline u8 shpc_readb(struct controller *ctrl, int reg)
{
return readb(ctrl->hpc_ctlr_handle->creg + reg);
}
static inline void shpc_writeb(struct controller *ctrl, int reg, u8 val)
{
writeb(val, ctrl->hpc_ctlr_handle->creg + reg);
}
static inline u16 shpc_readw(struct controller *ctrl, int reg)
{
return readw(ctrl->hpc_ctlr_handle->creg + reg);
}
static inline void shpc_writew(struct controller *ctrl, int reg, u16 val)
{
writew(val, ctrl->hpc_ctlr_handle->creg + reg);
}
static inline u32 shpc_readl(struct controller *ctrl, int reg)
{
return readl(ctrl->hpc_ctlr_handle->creg + reg);
}
static inline void shpc_writel(struct controller *ctrl, int reg, u32 val)
{
writel(val, ctrl->hpc_ctlr_handle->creg + reg);
}
static inline int shpc_indirect_read(struct controller *ctrl, int index,
u32 *value)
{
int rc;
u32 cap_offset = ctrl->cap_offset;
struct pci_dev *pdev = ctrl->pci_dev;
rc = pci_write_config_byte(pdev, cap_offset + DWORD_SELECT, index);
if (rc)
return rc;
return pci_read_config_dword(pdev, cap_offset + DWORD_DATA, value);
}
/*
* This is the interrupt polling timeout function.
*/
static void int_poll_timeout(unsigned long lphp_ctlr)
{
struct php_ctlr_state_s *php_ctlr =
(struct php_ctlr_state_s *)lphp_ctlr;
DBG_ENTER_ROUTINE
/* Poll for interrupt events. regs == NULL => polling */
shpc_isr(0, php_ctlr->callback_instance_id, NULL);
init_timer(&php_ctlr->int_poll_timer);
if (!shpchp_poll_time)
shpchp_poll_time = 2; /* default polling interval is 2 sec */
start_int_poll_timer(php_ctlr, shpchp_poll_time);
DBG_LEAVE_ROUTINE
}
/*
* This function starts the interrupt polling timer.
*/
static void start_int_poll_timer(struct php_ctlr_state_s *php_ctlr, int sec)
{
/* Clamp to sane value */
if ((sec <= 0) || (sec > 60))
sec = 2;
php_ctlr->int_poll_timer.function = &int_poll_timeout;
php_ctlr->int_poll_timer.data = (unsigned long)php_ctlr;
php_ctlr->int_poll_timer.expires = jiffies + sec * HZ;
add_timer(&php_ctlr->int_poll_timer);
}
static inline int shpc_wait_cmd(struct controller *ctrl)
{
int retval = 0;
unsigned int timeout_msec = shpchp_poll_mode ? 2000 : 1000;
unsigned long timeout = msecs_to_jiffies(timeout_msec);
int rc = wait_event_interruptible_timeout(ctrl->queue,
!ctrl->cmd_busy, timeout);
if (!rc) {
retval = -EIO;
err("Command not completed in %d msec\n", timeout_msec);
} else if (rc < 0) {
retval = -EINTR;
info("Command was interrupted by a signal\n");
}
ctrl->cmd_busy = 0;
return retval;
}
static int shpc_write_cmd(struct slot *slot, u8 t_slot, u8 cmd)
{
struct controller *ctrl = slot->ctrl;
u16 cmd_status;
int retval = 0;
u16 temp_word;
int i;
DBG_ENTER_ROUTINE
mutex_lock(&slot->ctrl->cmd_lock);
for (i = 0; i < 10; i++) {
cmd_status = shpc_readw(ctrl, CMD_STATUS);
if (!(cmd_status & 0x1))
break;
/* Check every 0.1 sec for a total of 1 sec*/
msleep(100);
}
cmd_status = shpc_readw(ctrl, CMD_STATUS);
if (cmd_status & 0x1) {
/* After 1 sec and and the controller is still busy */
err("%s : Controller is still busy after 1 sec.\n", __FUNCTION__);
retval = -EBUSY;
goto out;
}
++t_slot;
temp_word = (t_slot << 8) | (cmd & 0xFF);
dbg("%s: t_slot %x cmd %x\n", __FUNCTION__, t_slot, cmd);
/* To make sure the Controller Busy bit is 0 before we send out the
* command.
*/
slot->ctrl->cmd_busy = 1;
shpc_writew(ctrl, CMD, temp_word);
/*
* Wait for command completion.
*/
retval = shpc_wait_cmd(slot->ctrl);
if (retval)
goto out;
cmd_status = hpc_check_cmd_status(slot->ctrl);
if (cmd_status) {
err("%s: Failed to issued command 0x%x (error code = %d)\n",
__FUNCTION__, cmd, cmd_status);
retval = -EIO;
}
out:
mutex_unlock(&slot->ctrl->cmd_lock);
DBG_LEAVE_ROUTINE
return retval;
}
static int hpc_check_cmd_status(struct controller *ctrl)
{
u16 cmd_status;
int retval = 0;
DBG_ENTER_ROUTINE
cmd_status = shpc_readw(ctrl, CMD_STATUS) & 0x000F;
switch (cmd_status >> 1) {
case 0:
retval = 0;
break;
case 1:
retval = SWITCH_OPEN;
err("%s: Switch opened!\n", __FUNCTION__);
break;
case 2:
retval = INVALID_CMD;
err("%s: Invalid HPC command!\n", __FUNCTION__);
break;
case 4:
retval = INVALID_SPEED_MODE;
err("%s: Invalid bus speed/mode!\n", __FUNCTION__);
break;
default:
retval = cmd_status;
}
DBG_LEAVE_ROUTINE
return retval;
}
static int hpc_get_attention_status(struct slot *slot, u8 *status)
{
struct controller *ctrl = slot->ctrl;
u32 slot_reg;
u8 state;
DBG_ENTER_ROUTINE
slot_reg = shpc_readl(ctrl, SLOT_REG(slot->hp_slot));
state = (slot_reg & ATN_LED_STATE_MASK) >> ATN_LED_STATE_SHIFT;
switch (state) {
case ATN_LED_STATE_ON:
*status = 1; /* On */
break;
case ATN_LED_STATE_BLINK:
*status = 2; /* Blink */
break;
case ATN_LED_STATE_OFF:
*status = 0; /* Off */
break;
default:
*status = 0xFF; /* Reserved */
break;
}
DBG_LEAVE_ROUTINE
return 0;
}
static int hpc_get_power_status(struct slot * slot, u8 *status)
{
struct controller *ctrl = slot->ctrl;
u32 slot_reg;
u8 state;
DBG_ENTER_ROUTINE
slot_reg = shpc_readl(ctrl, SLOT_REG(slot->hp_slot));
state = (slot_reg & SLOT_STATE_MASK) >> SLOT_STATE_SHIFT;
switch (state) {
case SLOT_STATE_PWRONLY:
*status = 2; /* Powered only */
break;
case SLOT_STATE_ENABLED:
*status = 1; /* Enabled */
break;
case SLOT_STATE_DISABLED:
*status = 0; /* Disabled */
break;
default:
*status = 0xFF; /* Reserved */
break;
}
DBG_LEAVE_ROUTINE
return 0;
}
static int hpc_get_latch_status(struct slot *slot, u8 *status)
{
struct controller *ctrl = slot->ctrl;
u32 slot_reg;
DBG_ENTER_ROUTINE
slot_reg = shpc_readl(ctrl, SLOT_REG(slot->hp_slot));
*status = !!(slot_reg & MRL_SENSOR); /* 0 -> close; 1 -> open */
DBG_LEAVE_ROUTINE
return 0;
}
static int hpc_get_adapter_status(struct slot *slot, u8 *status)
{
struct controller *ctrl = slot->ctrl;
u32 slot_reg;
u8 state;
DBG_ENTER_ROUTINE
slot_reg = shpc_readl(ctrl, SLOT_REG(slot->hp_slot));
state = (slot_reg & PRSNT_MASK) >> PRSNT_SHIFT;
*status = (state != 0x3) ? 1 : 0;
DBG_LEAVE_ROUTINE
return 0;
}
static int hpc_get_prog_int(struct slot *slot, u8 *prog_int)
{
struct controller *ctrl = slot->ctrl;
DBG_ENTER_ROUTINE
*prog_int = shpc_readb(ctrl, PROG_INTERFACE);
DBG_LEAVE_ROUTINE
return 0;
}
static int hpc_get_adapter_speed(struct slot *slot, enum pci_bus_speed *value)
{
int retval = 0;
struct controller *ctrl = slot->ctrl;
u32 slot_reg = shpc_readl(ctrl, SLOT_REG(slot->hp_slot));
u8 m66_cap = !!(slot_reg & MHZ66_CAP);
u8 pi, pcix_cap;
DBG_ENTER_ROUTINE
if ((retval = hpc_get_prog_int(slot, &pi)))
return retval;
switch (pi) {
case 1:
pcix_cap = (slot_reg & PCIX_CAP_MASK_PI1) >> PCIX_CAP_SHIFT;
break;
case 2:
pcix_cap = (slot_reg & PCIX_CAP_MASK_PI2) >> PCIX_CAP_SHIFT;
break;
default:
return -ENODEV;
}
dbg("%s: slot_reg = %x, pcix_cap = %x, m66_cap = %x\n",
__FUNCTION__, slot_reg, pcix_cap, m66_cap);
switch (pcix_cap) {
case 0x0:
*value = m66_cap ? PCI_SPEED_66MHz : PCI_SPEED_33MHz;
break;
case 0x1:
*value = PCI_SPEED_66MHz_PCIX;
break;
case 0x3:
*value = PCI_SPEED_133MHz_PCIX;
break;
case 0x4:
*value = PCI_SPEED_133MHz_PCIX_266;
break;
case 0x5:
*value = PCI_SPEED_133MHz_PCIX_533;
break;
case 0x2:
default:
*value = PCI_SPEED_UNKNOWN;
retval = -ENODEV;
break;
}
dbg("Adapter speed = %d\n", *value);
DBG_LEAVE_ROUTINE
return retval;
}
static int hpc_get_mode1_ECC_cap(struct slot *slot, u8 *mode)
{
struct controller *ctrl = slot->ctrl;
u16 sec_bus_status;
u8 pi;
int retval = 0;
DBG_ENTER_ROUTINE
pi = shpc_readb(ctrl, PROG_INTERFACE);
sec_bus_status = shpc_readw(ctrl, SEC_BUS_CONFIG);
if (pi == 2) {
*mode = (sec_bus_status & 0x0100) >> 8;
} else {
retval = -1;
}
dbg("Mode 1 ECC cap = %d\n", *mode);
DBG_LEAVE_ROUTINE
return retval;
}
static int hpc_query_power_fault(struct slot * slot)
{
struct controller *ctrl = slot->ctrl;
u32 slot_reg;
DBG_ENTER_ROUTINE
slot_reg = shpc_readl(ctrl, SLOT_REG(slot->hp_slot));
DBG_LEAVE_ROUTINE
/* Note: Logic 0 => fault */
return !(slot_reg & POWER_FAULT);
}
static int hpc_set_attention_status(struct slot *slot, u8 value)
{
u8 slot_cmd = 0;
switch (value) {
case 0 :
slot_cmd = SET_ATTN_OFF; /* OFF */
break;
case 1:
slot_cmd = SET_ATTN_ON; /* ON */
break;
case 2:
slot_cmd = SET_ATTN_BLINK; /* BLINK */
break;
default:
return -1;
}
return shpc_write_cmd(slot, slot->hp_slot, slot_cmd);
}
static void hpc_set_green_led_on(struct slot *slot)
{
shpc_write_cmd(slot, slot->hp_slot, SET_PWR_ON);
}
static void hpc_set_green_led_off(struct slot *slot)
{
shpc_write_cmd(slot, slot->hp_slot, SET_PWR_OFF);
}
static void hpc_set_green_led_blink(struct slot *slot)
{
shpc_write_cmd(slot, slot->hp_slot, SET_PWR_BLINK);
}
int shpc_get_ctlr_slot_config(struct controller *ctrl,
int *num_ctlr_slots, /* number of slots in this HPC */
int *first_device_num, /* PCI dev num of the first slot in this SHPC */
int *physical_slot_num, /* phy slot num of the first slot in this SHPC */
int *updown, /* physical_slot_num increament: 1 or -1 */
int *flags)
{
u32 slot_config;
DBG_ENTER_ROUTINE
slot_config = shpc_readl(ctrl, SLOT_CONFIG);
*first_device_num = (slot_config & FIRST_DEV_NUM) >> 8;
*num_ctlr_slots = slot_config & SLOT_NUM;
*physical_slot_num = (slot_config & PSN) >> 16;
*updown = ((slot_config & UPDOWN) >> 29) ? 1 : -1;
dbg("%s: physical_slot_num = %x\n", __FUNCTION__, *physical_slot_num);
DBG_LEAVE_ROUTINE
return 0;
}
static void hpc_release_ctlr(struct controller *ctrl)
{
struct php_ctlr_state_s *php_ctlr = ctrl->hpc_ctlr_handle;
struct php_ctlr_state_s *p, *p_prev;
int i;
u32 slot_reg, serr_int;
DBG_ENTER_ROUTINE
/*
* Mask event interrupts and SERRs of all slots
*/
for (i = 0; i < ctrl->num_slots; i++) {
slot_reg = shpc_readl(ctrl, SLOT_REG(i));
slot_reg |= (PRSNT_CHANGE_INTR_MASK | ISO_PFAULT_INTR_MASK |
BUTTON_PRESS_INTR_MASK | MRL_CHANGE_INTR_MASK |
CON_PFAULT_INTR_MASK | MRL_CHANGE_SERR_MASK |
CON_PFAULT_SERR_MASK);
slot_reg &= ~SLOT_REG_RSVDZ_MASK;
shpc_writel(ctrl, SLOT_REG(i), slot_reg);
}
cleanup_slots(ctrl);
/*
* Mask SERR and System Interrut generation
*/
serr_int = shpc_readl(ctrl, SERR_INTR_ENABLE);
serr_int |= (GLOBAL_INTR_MASK | GLOBAL_SERR_MASK |
COMMAND_INTR_MASK | ARBITER_SERR_MASK);
serr_int &= ~SERR_INTR_RSVDZ_MASK;
shpc_writel(ctrl, SERR_INTR_ENABLE, serr_int);
if (shpchp_poll_mode) {
del_timer(&php_ctlr->int_poll_timer);
} else {
if (php_ctlr->irq) {
free_irq(php_ctlr->irq, ctrl);
php_ctlr->irq = 0;
pci_disable_msi(php_ctlr->pci_dev);
}
}
if (php_ctlr->pci_dev) {
iounmap(php_ctlr->creg);
release_mem_region(ctrl->mmio_base, ctrl->mmio_size);
php_ctlr->pci_dev = NULL;
}
spin_lock(&list_lock);
p = php_ctlr_list_head;
p_prev = NULL;
while (p) {
if (p == php_ctlr) {
if (p_prev)
p_prev->pnext = p->pnext;
else
php_ctlr_list_head = p->pnext;
break;
} else {
p_prev = p;
p = p->pnext;
}
}
spin_unlock(&list_lock);
kfree(php_ctlr);
/*
* If this is the last controller to be released, destroy the
* shpchpd work queue
*/
if (atomic_dec_and_test(&shpchp_num_controllers))
destroy_workqueue(shpchp_wq);
DBG_LEAVE_ROUTINE
}
static int hpc_power_on_slot(struct slot * slot)
{
int retval;
DBG_ENTER_ROUTINE
retval = shpc_write_cmd(slot, slot->hp_slot, SET_SLOT_PWR);
if (retval) {
err("%s: Write command failed!\n", __FUNCTION__);
return retval;
}
DBG_LEAVE_ROUTINE
return 0;
}
static int hpc_slot_enable(struct slot * slot)
{
int retval;
DBG_ENTER_ROUTINE
/* Slot - Enable, Power Indicator - Blink, Attention Indicator - Off */
retval = shpc_write_cmd(slot, slot->hp_slot,
SET_SLOT_ENABLE | SET_PWR_BLINK | SET_ATTN_OFF);
if (retval) {
err("%s: Write command failed!\n", __FUNCTION__);
return retval;
}
DBG_LEAVE_ROUTINE
return 0;
}
static int hpc_slot_disable(struct slot * slot)
{
int retval;
DBG_ENTER_ROUTINE
/* Slot - Disable, Power Indicator - Off, Attention Indicator - On */
retval = shpc_write_cmd(slot, slot->hp_slot,
SET_SLOT_DISABLE | SET_PWR_OFF | SET_ATTN_ON);
if (retval) {
err("%s: Write command failed!\n", __FUNCTION__);
return retval;
}
DBG_LEAVE_ROUTINE
return 0;
}
static int hpc_set_bus_speed_mode(struct slot * slot, enum pci_bus_speed value)
{
int retval;
struct controller *ctrl = slot->ctrl;
u8 pi, cmd;
DBG_ENTER_ROUTINE
pi = shpc_readb(ctrl, PROG_INTERFACE);
if ((pi == 1) && (value > PCI_SPEED_133MHz_PCIX))
return -EINVAL;
switch (value) {
case PCI_SPEED_33MHz:
cmd = SETA_PCI_33MHZ;
break;
case PCI_SPEED_66MHz:
cmd = SETA_PCI_66MHZ;
break;
case PCI_SPEED_66MHz_PCIX:
cmd = SETA_PCIX_66MHZ;
break;
case PCI_SPEED_100MHz_PCIX:
cmd = SETA_PCIX_100MHZ;
break;
case PCI_SPEED_133MHz_PCIX:
cmd = SETA_PCIX_133MHZ;
break;
case PCI_SPEED_66MHz_PCIX_ECC:
cmd = SETB_PCIX_66MHZ_EM;
break;
case PCI_SPEED_100MHz_PCIX_ECC:
cmd = SETB_PCIX_100MHZ_EM;
break;
case PCI_SPEED_133MHz_PCIX_ECC:
cmd = SETB_PCIX_133MHZ_EM;
break;
case PCI_SPEED_66MHz_PCIX_266:
cmd = SETB_PCIX_66MHZ_266;
break;
case PCI_SPEED_100MHz_PCIX_266:
cmd = SETB_PCIX_100MHZ_266;
break;
case PCI_SPEED_133MHz_PCIX_266:
cmd = SETB_PCIX_133MHZ_266;
break;
case PCI_SPEED_66MHz_PCIX_533:
cmd = SETB_PCIX_66MHZ_533;
break;
case PCI_SPEED_100MHz_PCIX_533:
cmd = SETB_PCIX_100MHZ_533;
break;
case PCI_SPEED_133MHz_PCIX_533:
cmd = SETB_PCIX_133MHZ_533;
break;
default:
return -EINVAL;
}
retval = shpc_write_cmd(slot, 0, cmd);
if (retval)
err("%s: Write command failed!\n", __FUNCTION__);
DBG_LEAVE_ROUTINE
return retval;
}
static irqreturn_t shpc_isr(int irq, void *dev_id, struct pt_regs *regs)
{
struct controller *ctrl = (struct controller *)dev_id;
struct php_ctlr_state_s *php_ctlr = ctrl->hpc_ctlr_handle;
u32 serr_int, slot_reg, intr_loc, intr_loc2;
int hp_slot;
/* Check to see if it was our interrupt */
intr_loc = shpc_readl(ctrl, INTR_LOC);
if (!intr_loc)
return IRQ_NONE;
dbg("%s: intr_loc = %x\n",__FUNCTION__, intr_loc);
if(!shpchp_poll_mode) {
/*
* Mask Global Interrupt Mask - see implementation
* note on p. 139 of SHPC spec rev 1.0
*/
serr_int = shpc_readl(ctrl, SERR_INTR_ENABLE);
serr_int |= GLOBAL_INTR_MASK;
serr_int &= ~SERR_INTR_RSVDZ_MASK;
shpc_writel(ctrl, SERR_INTR_ENABLE, serr_int);
intr_loc2 = shpc_readl(ctrl, INTR_LOC);
dbg("%s: intr_loc2 = %x\n",__FUNCTION__, intr_loc2);
}
if (intr_loc & CMD_INTR_PENDING) {
/*
* Command Complete Interrupt Pending
* RO only - clear by writing 1 to the Command Completion
* Detect bit in Controller SERR-INT register
*/
serr_int = shpc_readl(ctrl, SERR_INTR_ENABLE);
serr_int &= ~SERR_INTR_RSVDZ_MASK;
shpc_writel(ctrl, SERR_INTR_ENABLE, serr_int);
ctrl->cmd_busy = 0;
wake_up_interruptible(&ctrl->queue);
}
if (!(intr_loc & ~CMD_INTR_PENDING))
goto out;
for (hp_slot = 0; hp_slot < ctrl->num_slots; hp_slot++) {
/* To find out which slot has interrupt pending */
if (!(intr_loc & SLOT_INTR_PENDING(hp_slot)))
continue;
slot_reg = shpc_readl(ctrl, SLOT_REG(hp_slot));
dbg("%s: Slot %x with intr, slot register = %x\n",
__FUNCTION__, hp_slot, slot_reg);
if (slot_reg & MRL_CHANGE_DETECTED)
php_ctlr->switch_change_callback(
hp_slot, php_ctlr->callback_instance_id);
if (slot_reg & BUTTON_PRESS_DETECTED)
php_ctlr->attention_button_callback(
hp_slot, php_ctlr->callback_instance_id);
if (slot_reg & PRSNT_CHANGE_DETECTED)
php_ctlr->presence_change_callback(
hp_slot , php_ctlr->callback_instance_id);
if (slot_reg & (ISO_PFAULT_DETECTED | CON_PFAULT_DETECTED))
php_ctlr->power_fault_callback(
hp_slot, php_ctlr->callback_instance_id);
/* Clear all slot events */
slot_reg &= ~SLOT_REG_RSVDZ_MASK;
shpc_writel(ctrl, SLOT_REG(hp_slot), slot_reg);
}
out:
if (!shpchp_poll_mode) {
/* Unmask Global Interrupt Mask */
serr_int = shpc_readl(ctrl, SERR_INTR_ENABLE);
serr_int &= ~(GLOBAL_INTR_MASK | SERR_INTR_RSVDZ_MASK);
shpc_writel(ctrl, SERR_INTR_ENABLE, serr_int);
}
return IRQ_HANDLED;
}
static int hpc_get_max_bus_speed (struct slot *slot, enum pci_bus_speed *value)
{
int retval = 0;
struct controller *ctrl = slot->ctrl;
enum pci_bus_speed bus_speed = PCI_SPEED_UNKNOWN;
u8 pi = shpc_readb(ctrl, PROG_INTERFACE);
u32 slot_avail1 = shpc_readl(ctrl, SLOT_AVAIL1);
u32 slot_avail2 = shpc_readl(ctrl, SLOT_AVAIL2);
DBG_ENTER_ROUTINE
if (pi == 2) {
if (slot_avail2 & SLOT_133MHZ_PCIX_533)
bus_speed = PCI_SPEED_133MHz_PCIX_533;
else if (slot_avail2 & SLOT_100MHZ_PCIX_533)
bus_speed = PCI_SPEED_100MHz_PCIX_533;
else if (slot_avail2 & SLOT_66MHZ_PCIX_533)
bus_speed = PCI_SPEED_66MHz_PCIX_533;
else if (slot_avail2 & SLOT_133MHZ_PCIX_266)
bus_speed = PCI_SPEED_133MHz_PCIX_266;
else if (slot_avail2 & SLOT_100MHZ_PCIX_266)
bus_speed = PCI_SPEED_100MHz_PCIX_266;
else if (slot_avail2 & SLOT_66MHZ_PCIX_266)
bus_speed = PCI_SPEED_66MHz_PCIX_266;
}
if (bus_speed == PCI_SPEED_UNKNOWN) {
if (slot_avail1 & SLOT_133MHZ_PCIX)
bus_speed = PCI_SPEED_133MHz_PCIX;
else if (slot_avail1 & SLOT_100MHZ_PCIX)
bus_speed = PCI_SPEED_100MHz_PCIX;
else if (slot_avail1 & SLOT_66MHZ_PCIX)
bus_speed = PCI_SPEED_66MHz_PCIX;
else if (slot_avail2 & SLOT_66MHZ)
bus_speed = PCI_SPEED_66MHz;
else if (slot_avail1 & SLOT_33MHZ)
bus_speed = PCI_SPEED_33MHz;
else
retval = -ENODEV;
}
*value = bus_speed;
dbg("Max bus speed = %d\n", bus_speed);
DBG_LEAVE_ROUTINE
return retval;
}
static int hpc_get_cur_bus_speed (struct slot *slot, enum pci_bus_speed *value)
{
int retval = 0;
struct controller *ctrl = slot->ctrl;
enum pci_bus_speed bus_speed = PCI_SPEED_UNKNOWN;
u16 sec_bus_reg = shpc_readw(ctrl, SEC_BUS_CONFIG);
u8 pi = shpc_readb(ctrl, PROG_INTERFACE);
u8 speed_mode = (pi == 2) ? (sec_bus_reg & 0xF) : (sec_bus_reg & 0x7);
DBG_ENTER_ROUTINE
if ((pi == 1) && (speed_mode > 4)) {
*value = PCI_SPEED_UNKNOWN;
return -ENODEV;
}
switch (speed_mode) {
case 0x0:
*value = PCI_SPEED_33MHz;
break;
case 0x1:
*value = PCI_SPEED_66MHz;
break;
case 0x2:
*value = PCI_SPEED_66MHz_PCIX;
break;
case 0x3:
*value = PCI_SPEED_100MHz_PCIX;
break;
case 0x4:
*value = PCI_SPEED_133MHz_PCIX;
break;
case 0x5:
*value = PCI_SPEED_66MHz_PCIX_ECC;
break;
case 0x6:
*value = PCI_SPEED_100MHz_PCIX_ECC;
break;
case 0x7:
*value = PCI_SPEED_133MHz_PCIX_ECC;
break;
case 0x8:
*value = PCI_SPEED_66MHz_PCIX_266;
break;
case 0x9:
*value = PCI_SPEED_100MHz_PCIX_266;
break;
case 0xa:
*value = PCI_SPEED_133MHz_PCIX_266;
break;
case 0xb:
*value = PCI_SPEED_66MHz_PCIX_533;
break;
case 0xc:
*value = PCI_SPEED_100MHz_PCIX_533;
break;
case 0xd:
*value = PCI_SPEED_133MHz_PCIX_533;
break;
default:
*value = PCI_SPEED_UNKNOWN;
retval = -ENODEV;
break;
}
dbg("Current bus speed = %d\n", bus_speed);
DBG_LEAVE_ROUTINE
return retval;
}
static struct hpc_ops shpchp_hpc_ops = {
.power_on_slot = hpc_power_on_slot,
.slot_enable = hpc_slot_enable,
.slot_disable = hpc_slot_disable,
.set_bus_speed_mode = hpc_set_bus_speed_mode,
.set_attention_status = hpc_set_attention_status,
.get_power_status = hpc_get_power_status,
.get_attention_status = hpc_get_attention_status,
.get_latch_status = hpc_get_latch_status,
.get_adapter_status = hpc_get_adapter_status,
.get_max_bus_speed = hpc_get_max_bus_speed,
.get_cur_bus_speed = hpc_get_cur_bus_speed,
.get_adapter_speed = hpc_get_adapter_speed,
.get_mode1_ECC_cap = hpc_get_mode1_ECC_cap,
.get_prog_int = hpc_get_prog_int,
.query_power_fault = hpc_query_power_fault,
.green_led_on = hpc_set_green_led_on,
.green_led_off = hpc_set_green_led_off,
.green_led_blink = hpc_set_green_led_blink,
.release_ctlr = hpc_release_ctlr,
};
int shpc_init(struct controller * ctrl, struct pci_dev * pdev)
{
struct php_ctlr_state_s *php_ctlr, *p;
void *instance_id = ctrl;
int rc, num_slots = 0;
u8 hp_slot;
u32 shpc_base_offset;
u32 tempdword, slot_reg, slot_config;
u8 i;
DBG_ENTER_ROUTINE
ctrl->pci_dev = pdev; /* pci_dev of the P2P bridge */
spin_lock_init(&list_lock);
php_ctlr = kzalloc(sizeof(*php_ctlr), GFP_KERNEL);
if (!php_ctlr) { /* allocate controller state data */
err("%s: HPC controller memory allocation error!\n", __FUNCTION__);
goto abort;
}
php_ctlr->pci_dev = pdev; /* save pci_dev in context */
if ((pdev->vendor == PCI_VENDOR_ID_AMD) || (pdev->device ==
PCI_DEVICE_ID_AMD_GOLAM_7450)) {
/* amd shpc driver doesn't use Base Offset; assume 0 */
ctrl->mmio_base = pci_resource_start(pdev, 0);
ctrl->mmio_size = pci_resource_len(pdev, 0);
} else {
ctrl->cap_offset = pci_find_capability(pdev, PCI_CAP_ID_SHPC);
if (!ctrl->cap_offset) {
err("%s : cap_offset == 0\n", __FUNCTION__);
goto abort_free_ctlr;
}
dbg("%s: cap_offset = %x\n", __FUNCTION__, ctrl->cap_offset);
rc = shpc_indirect_read(ctrl, 0, &shpc_base_offset);
if (rc) {
err("%s: cannot read base_offset\n", __FUNCTION__);
goto abort_free_ctlr;
}
rc = shpc_indirect_read(ctrl, 3, &tempdword);
if (rc) {
err("%s: cannot read slot config\n", __FUNCTION__);
goto abort_free_ctlr;
}
num_slots = tempdword & SLOT_NUM;
dbg("%s: num_slots (indirect) %x\n", __FUNCTION__, num_slots);
for (i = 0; i < 9 + num_slots; i++) {
rc = shpc_indirect_read(ctrl, i, &tempdword);
if (rc) {
err("%s: cannot read creg (index = %d)\n",
__FUNCTION__, i);
goto abort_free_ctlr;
}
dbg("%s: offset %d: value %x\n", __FUNCTION__,i,
tempdword);
}
ctrl->mmio_base =
pci_resource_start(pdev, 0) + shpc_base_offset;
ctrl->mmio_size = 0x24 + 0x4 * num_slots;
}
info("HPC vendor_id %x device_id %x ss_vid %x ss_did %x\n", pdev->vendor, pdev->device, pdev->subsystem_vendor,
pdev->subsystem_device);
if (pci_enable_device(pdev))
goto abort_free_ctlr;
if (!request_mem_region(ctrl->mmio_base, ctrl->mmio_size, MY_NAME)) {
err("%s: cannot reserve MMIO region\n", __FUNCTION__);
goto abort_free_ctlr;
}
php_ctlr->creg = ioremap(ctrl->mmio_base, ctrl->mmio_size);
if (!php_ctlr->creg) {
err("%s: cannot remap MMIO region %lx @ %lx\n", __FUNCTION__,
ctrl->mmio_size, ctrl->mmio_base);
release_mem_region(ctrl->mmio_base, ctrl->mmio_size);
goto abort_free_ctlr;
}
dbg("%s: php_ctlr->creg %p\n", __FUNCTION__, php_ctlr->creg);
mutex_init(&ctrl->crit_sect);
mutex_init(&ctrl->cmd_lock);
/* Setup wait queue */
init_waitqueue_head(&ctrl->queue);
/* Find the IRQ */
php_ctlr->irq = pdev->irq;
php_ctlr->attention_button_callback = shpchp_handle_attention_button,
php_ctlr->switch_change_callback = shpchp_handle_switch_change;
php_ctlr->presence_change_callback = shpchp_handle_presence_change;
php_ctlr->power_fault_callback = shpchp_handle_power_fault;
php_ctlr->callback_instance_id = instance_id;
ctrl->hpc_ctlr_handle = php_ctlr;
ctrl->hpc_ops = &shpchp_hpc_ops;
/* Return PCI Controller Info */
slot_config = shpc_readl(ctrl, SLOT_CONFIG);
php_ctlr->slot_device_offset = (slot_config & FIRST_DEV_NUM) >> 8;
php_ctlr->num_slots = slot_config & SLOT_NUM;
dbg("%s: slot_device_offset %x\n", __FUNCTION__, php_ctlr->slot_device_offset);
dbg("%s: num_slots %x\n", __FUNCTION__, php_ctlr->num_slots);
/* Mask Global Interrupt Mask & Command Complete Interrupt Mask */
tempdword = shpc_readl(ctrl, SERR_INTR_ENABLE);
dbg("%s: SERR_INTR_ENABLE = %x\n", __FUNCTION__, tempdword);
tempdword |= (GLOBAL_INTR_MASK | GLOBAL_SERR_MASK |
COMMAND_INTR_MASK | ARBITER_SERR_MASK);
tempdword &= ~SERR_INTR_RSVDZ_MASK;
shpc_writel(ctrl, SERR_INTR_ENABLE, tempdword);
tempdword = shpc_readl(ctrl, SERR_INTR_ENABLE);
dbg("%s: SERR_INTR_ENABLE = %x\n", __FUNCTION__, tempdword);
/* Mask the MRL sensor SERR Mask of individual slot in
* Slot SERR-INT Mask & clear all the existing event if any
*/
for (hp_slot = 0; hp_slot < php_ctlr->num_slots; hp_slot++) {
slot_reg = shpc_readl(ctrl, SLOT_REG(hp_slot));
dbg("%s: Default Logical Slot Register %d value %x\n", __FUNCTION__,
hp_slot, slot_reg);
slot_reg |= (PRSNT_CHANGE_INTR_MASK | ISO_PFAULT_INTR_MASK |
BUTTON_PRESS_INTR_MASK | MRL_CHANGE_INTR_MASK |
CON_PFAULT_INTR_MASK | MRL_CHANGE_SERR_MASK |
CON_PFAULT_SERR_MASK);
slot_reg &= ~SLOT_REG_RSVDZ_MASK;
shpc_writel(ctrl, SLOT_REG(hp_slot), slot_reg);
}
if (shpchp_poll_mode) {/* Install interrupt polling code */
/* Install and start the interrupt polling timer */
init_timer(&php_ctlr->int_poll_timer);
start_int_poll_timer( php_ctlr, 10 ); /* start with 10 second delay */
} else {
/* Installs the interrupt handler */
rc = pci_enable_msi(pdev);
if (rc) {
info("Can't get msi for the hotplug controller\n");
info("Use INTx for the hotplug controller\n");
} else
php_ctlr->irq = pdev->irq;
rc = request_irq(php_ctlr->irq, shpc_isr, IRQF_SHARED, MY_NAME, (void *) ctrl);
dbg("%s: request_irq %d for hpc%d (returns %d)\n", __FUNCTION__, php_ctlr->irq, ctlr_seq_num, rc);
if (rc) {
err("Can't get irq %d for the hotplug controller\n", php_ctlr->irq);
goto abort_free_ctlr;
}
}
dbg("%s: HPC at b:d:f:irq=0x%x:%x:%x:%x\n", __FUNCTION__,
pdev->bus->number, PCI_SLOT(pdev->devfn),
PCI_FUNC(pdev->devfn), pdev->irq);
get_hp_hw_control_from_firmware(pdev);
/* Add this HPC instance into the HPC list */
spin_lock(&list_lock);
if (php_ctlr_list_head == 0) {
php_ctlr_list_head = php_ctlr;
p = php_ctlr_list_head;
p->pnext = NULL;
} else {
p = php_ctlr_list_head;
while (p->pnext)
p = p->pnext;
p->pnext = php_ctlr;
}
spin_unlock(&list_lock);
ctlr_seq_num++;
/*
* If this is the first controller to be initialized,
* initialize the shpchpd work queue
*/
if (atomic_add_return(1, &shpchp_num_controllers) == 1) {
shpchp_wq = create_singlethread_workqueue("shpchpd");
if (!shpchp_wq)
return -ENOMEM;
}
/*
* Unmask all event interrupts of all slots
*/
for (hp_slot = 0; hp_slot < php_ctlr->num_slots; hp_slot++) {
slot_reg = shpc_readl(ctrl, SLOT_REG(hp_slot));
dbg("%s: Default Logical Slot Register %d value %x\n", __FUNCTION__,
hp_slot, slot_reg);
slot_reg &= ~(PRSNT_CHANGE_INTR_MASK | ISO_PFAULT_INTR_MASK |
BUTTON_PRESS_INTR_MASK | MRL_CHANGE_INTR_MASK |
CON_PFAULT_INTR_MASK | SLOT_REG_RSVDZ_MASK);
shpc_writel(ctrl, SLOT_REG(hp_slot), slot_reg);
}
if (!shpchp_poll_mode) {
/* Unmask all general input interrupts and SERR */
tempdword = shpc_readl(ctrl, SERR_INTR_ENABLE);
tempdword &= ~(GLOBAL_INTR_MASK | COMMAND_INTR_MASK |
SERR_INTR_RSVDZ_MASK);
shpc_writel(ctrl, SERR_INTR_ENABLE, tempdword);
tempdword = shpc_readl(ctrl, SERR_INTR_ENABLE);
dbg("%s: SERR_INTR_ENABLE = %x\n", __FUNCTION__, tempdword);
}
DBG_LEAVE_ROUTINE
return 0;
/* We end up here for the many possible ways to fail this API. */
abort_free_ctlr:
kfree(php_ctlr);
abort:
DBG_LEAVE_ROUTINE
return -1;
}