linux/drivers/ipack/carriers/tpci200.c
Federico Vaga 36c53b3cc3 ipack: save carrier owner to allow device to get it
There was not any kind of protection against carrier driver removal.
In this way, device driver can 'get' the carrier driver when it is
using it.

Signed-off-by: Federico Vaga <federico.vaga@cern.ch>
Acked-by: Samuel Iglesias Gonsalvez <siglesias@igalia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2014-09-23 23:13:13 -07:00

641 lines
16 KiB
C

/**
* tpci200.c
*
* driver for the TEWS TPCI-200 device
*
* Copyright (C) 2009-2012 CERN (www.cern.ch)
* Author: Nicolas Serafini, EIC2 SA
* Author: Samuel Iglesias Gonsalvez <siglesias@igalia.com>
*
* 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; version 2 of the License.
*/
#include <linux/module.h>
#include <linux/slab.h>
#include "tpci200.h"
static const u16 tpci200_status_timeout[] = {
TPCI200_A_TIMEOUT,
TPCI200_B_TIMEOUT,
TPCI200_C_TIMEOUT,
TPCI200_D_TIMEOUT,
};
static const u16 tpci200_status_error[] = {
TPCI200_A_ERROR,
TPCI200_B_ERROR,
TPCI200_C_ERROR,
TPCI200_D_ERROR,
};
static const size_t tpci200_space_size[IPACK_SPACE_COUNT] = {
[IPACK_IO_SPACE] = TPCI200_IO_SPACE_SIZE,
[IPACK_ID_SPACE] = TPCI200_ID_SPACE_SIZE,
[IPACK_INT_SPACE] = TPCI200_INT_SPACE_SIZE,
[IPACK_MEM8_SPACE] = TPCI200_MEM8_SPACE_SIZE,
[IPACK_MEM16_SPACE] = TPCI200_MEM16_SPACE_SIZE,
};
static const size_t tpci200_space_interval[IPACK_SPACE_COUNT] = {
[IPACK_IO_SPACE] = TPCI200_IO_SPACE_INTERVAL,
[IPACK_ID_SPACE] = TPCI200_ID_SPACE_INTERVAL,
[IPACK_INT_SPACE] = TPCI200_INT_SPACE_INTERVAL,
[IPACK_MEM8_SPACE] = TPCI200_MEM8_SPACE_INTERVAL,
[IPACK_MEM16_SPACE] = TPCI200_MEM16_SPACE_INTERVAL,
};
static struct tpci200_board *check_slot(struct ipack_device *dev)
{
struct tpci200_board *tpci200;
if (dev == NULL)
return NULL;
tpci200 = dev_get_drvdata(dev->bus->parent);
if (tpci200 == NULL) {
dev_info(&dev->dev, "carrier board not found\n");
return NULL;
}
if (dev->slot >= TPCI200_NB_SLOT) {
dev_info(&dev->dev,
"Slot [%d:%d] doesn't exist! Last tpci200 slot is %d.\n",
dev->bus->bus_nr, dev->slot, TPCI200_NB_SLOT-1);
return NULL;
}
return tpci200;
}
static void tpci200_clear_mask(struct tpci200_board *tpci200,
__le16 __iomem *addr, u16 mask)
{
unsigned long flags;
spin_lock_irqsave(&tpci200->regs_lock, flags);
iowrite16(ioread16(addr) & (~mask), addr);
spin_unlock_irqrestore(&tpci200->regs_lock, flags);
}
static void tpci200_set_mask(struct tpci200_board *tpci200,
__le16 __iomem *addr, u16 mask)
{
unsigned long flags;
spin_lock_irqsave(&tpci200->regs_lock, flags);
iowrite16(ioread16(addr) | mask, addr);
spin_unlock_irqrestore(&tpci200->regs_lock, flags);
}
static void tpci200_unregister(struct tpci200_board *tpci200)
{
free_irq(tpci200->info->pdev->irq, (void *) tpci200);
pci_iounmap(tpci200->info->pdev, tpci200->info->interface_regs);
pci_iounmap(tpci200->info->pdev, tpci200->info->cfg_regs);
pci_release_region(tpci200->info->pdev, TPCI200_IP_INTERFACE_BAR);
pci_release_region(tpci200->info->pdev, TPCI200_IO_ID_INT_SPACES_BAR);
pci_release_region(tpci200->info->pdev, TPCI200_MEM16_SPACE_BAR);
pci_release_region(tpci200->info->pdev, TPCI200_MEM8_SPACE_BAR);
pci_release_region(tpci200->info->pdev, TPCI200_CFG_MEM_BAR);
pci_disable_device(tpci200->info->pdev);
pci_dev_put(tpci200->info->pdev);
}
static void tpci200_enable_irq(struct tpci200_board *tpci200,
int islot)
{
tpci200_set_mask(tpci200,
&tpci200->info->interface_regs->control[islot],
TPCI200_INT0_EN | TPCI200_INT1_EN);
}
static void tpci200_disable_irq(struct tpci200_board *tpci200,
int islot)
{
tpci200_clear_mask(tpci200,
&tpci200->info->interface_regs->control[islot],
TPCI200_INT0_EN | TPCI200_INT1_EN);
}
static irqreturn_t tpci200_slot_irq(struct slot_irq *slot_irq)
{
irqreturn_t ret;
if (!slot_irq)
return -ENODEV;
ret = slot_irq->handler(slot_irq->arg);
return ret;
}
static irqreturn_t tpci200_interrupt(int irq, void *dev_id)
{
struct tpci200_board *tpci200 = (struct tpci200_board *) dev_id;
struct slot_irq *slot_irq;
irqreturn_t ret;
u16 status_reg;
int i;
/* Read status register */
status_reg = ioread16(&tpci200->info->interface_regs->status);
/* Did we cause the interrupt? */
if (!(status_reg & TPCI200_SLOT_INT_MASK))
return IRQ_NONE;
/* callback to the IRQ handler for the corresponding slot */
rcu_read_lock();
for (i = 0; i < TPCI200_NB_SLOT; i++) {
if (!(status_reg & ((TPCI200_A_INT0 | TPCI200_A_INT1) << (2 * i))))
continue;
slot_irq = rcu_dereference(tpci200->slots[i].irq);
ret = tpci200_slot_irq(slot_irq);
if (ret == -ENODEV) {
dev_info(&tpci200->info->pdev->dev,
"No registered ISR for slot [%d:%d]!. IRQ will be disabled.\n",
tpci200->number, i);
tpci200_disable_irq(tpci200, i);
}
}
rcu_read_unlock();
return IRQ_HANDLED;
}
static int tpci200_free_irq(struct ipack_device *dev)
{
struct slot_irq *slot_irq;
struct tpci200_board *tpci200;
tpci200 = check_slot(dev);
if (tpci200 == NULL)
return -EINVAL;
if (mutex_lock_interruptible(&tpci200->mutex))
return -ERESTARTSYS;
if (tpci200->slots[dev->slot].irq == NULL) {
mutex_unlock(&tpci200->mutex);
return -EINVAL;
}
tpci200_disable_irq(tpci200, dev->slot);
slot_irq = tpci200->slots[dev->slot].irq;
/* uninstall handler */
RCU_INIT_POINTER(tpci200->slots[dev->slot].irq, NULL);
synchronize_rcu();
kfree(slot_irq);
mutex_unlock(&tpci200->mutex);
return 0;
}
static int tpci200_request_irq(struct ipack_device *dev,
irqreturn_t (*handler)(void *), void *arg)
{
int res = 0;
struct slot_irq *slot_irq;
struct tpci200_board *tpci200;
tpci200 = check_slot(dev);
if (tpci200 == NULL)
return -EINVAL;
if (mutex_lock_interruptible(&tpci200->mutex))
return -ERESTARTSYS;
if (tpci200->slots[dev->slot].irq != NULL) {
dev_err(&dev->dev,
"Slot [%d:%d] IRQ already registered !\n",
dev->bus->bus_nr,
dev->slot);
res = -EINVAL;
goto out_unlock;
}
slot_irq = kzalloc(sizeof(struct slot_irq), GFP_KERNEL);
if (slot_irq == NULL) {
dev_err(&dev->dev,
"Slot [%d:%d] unable to allocate memory for IRQ !\n",
dev->bus->bus_nr, dev->slot);
res = -ENOMEM;
goto out_unlock;
}
/*
* WARNING: Setup Interrupt Vector in the IndustryPack device
* before an IRQ request.
* Read the User Manual of your IndustryPack device to know
* where to write the vector in memory.
*/
slot_irq->handler = handler;
slot_irq->arg = arg;
slot_irq->holder = dev;
rcu_assign_pointer(tpci200->slots[dev->slot].irq, slot_irq);
tpci200_enable_irq(tpci200, dev->slot);
out_unlock:
mutex_unlock(&tpci200->mutex);
return res;
}
static int tpci200_register(struct tpci200_board *tpci200)
{
int i;
int res;
phys_addr_t ioidint_base;
unsigned short slot_ctrl;
if (pci_enable_device(tpci200->info->pdev) < 0)
return -ENODEV;
/* Request IP interface register (Bar 2) */
res = pci_request_region(tpci200->info->pdev, TPCI200_IP_INTERFACE_BAR,
"Carrier IP interface registers");
if (res) {
dev_err(&tpci200->info->pdev->dev,
"(bn 0x%X, sn 0x%X) failed to allocate PCI resource for BAR 2 !",
tpci200->info->pdev->bus->number,
tpci200->info->pdev->devfn);
goto out_disable_pci;
}
/* Request IO ID INT space (Bar 3) */
res = pci_request_region(tpci200->info->pdev,
TPCI200_IO_ID_INT_SPACES_BAR,
"Carrier IO ID INT space");
if (res) {
dev_err(&tpci200->info->pdev->dev,
"(bn 0x%X, sn 0x%X) failed to allocate PCI resource for BAR 3 !",
tpci200->info->pdev->bus->number,
tpci200->info->pdev->devfn);
goto out_release_ip_space;
}
/* Request MEM8 space (Bar 5) */
res = pci_request_region(tpci200->info->pdev, TPCI200_MEM8_SPACE_BAR,
"Carrier MEM8 space");
if (res) {
dev_err(&tpci200->info->pdev->dev,
"(bn 0x%X, sn 0x%X) failed to allocate PCI resource for BAR 5!",
tpci200->info->pdev->bus->number,
tpci200->info->pdev->devfn);
goto out_release_ioid_int_space;
}
/* Request MEM16 space (Bar 4) */
res = pci_request_region(tpci200->info->pdev, TPCI200_MEM16_SPACE_BAR,
"Carrier MEM16 space");
if (res) {
dev_err(&tpci200->info->pdev->dev,
"(bn 0x%X, sn 0x%X) failed to allocate PCI resource for BAR 4!",
tpci200->info->pdev->bus->number,
tpci200->info->pdev->devfn);
goto out_release_mem8_space;
}
/* Map internal tpci200 driver user space */
tpci200->info->interface_regs =
ioremap_nocache(pci_resource_start(tpci200->info->pdev,
TPCI200_IP_INTERFACE_BAR),
TPCI200_IFACE_SIZE);
/* Initialize lock that protects interface_regs */
spin_lock_init(&tpci200->regs_lock);
ioidint_base = pci_resource_start(tpci200->info->pdev,
TPCI200_IO_ID_INT_SPACES_BAR);
tpci200->mod_mem[IPACK_IO_SPACE] = ioidint_base + TPCI200_IO_SPACE_OFF;
tpci200->mod_mem[IPACK_ID_SPACE] = ioidint_base + TPCI200_ID_SPACE_OFF;
tpci200->mod_mem[IPACK_INT_SPACE] =
ioidint_base + TPCI200_INT_SPACE_OFF;
tpci200->mod_mem[IPACK_MEM8_SPACE] =
pci_resource_start(tpci200->info->pdev,
TPCI200_MEM8_SPACE_BAR);
tpci200->mod_mem[IPACK_MEM16_SPACE] =
pci_resource_start(tpci200->info->pdev,
TPCI200_MEM16_SPACE_BAR);
/* Set the default parameters of the slot
* INT0 disabled, level sensitive
* INT1 disabled, level sensitive
* error interrupt disabled
* timeout interrupt disabled
* recover time disabled
* clock rate 8 MHz
*/
slot_ctrl = 0;
for (i = 0; i < TPCI200_NB_SLOT; i++)
writew(slot_ctrl, &tpci200->info->interface_regs->control[i]);
res = request_irq(tpci200->info->pdev->irq,
tpci200_interrupt, IRQF_SHARED,
KBUILD_MODNAME, (void *) tpci200);
if (res) {
dev_err(&tpci200->info->pdev->dev,
"(bn 0x%X, sn 0x%X) unable to register IRQ !",
tpci200->info->pdev->bus->number,
tpci200->info->pdev->devfn);
goto out_release_ioid_int_space;
}
return 0;
out_release_mem8_space:
pci_release_region(tpci200->info->pdev, TPCI200_MEM8_SPACE_BAR);
out_release_ioid_int_space:
pci_release_region(tpci200->info->pdev, TPCI200_IO_ID_INT_SPACES_BAR);
out_release_ip_space:
pci_release_region(tpci200->info->pdev, TPCI200_IP_INTERFACE_BAR);
out_disable_pci:
pci_disable_device(tpci200->info->pdev);
return res;
}
static int tpci200_get_clockrate(struct ipack_device *dev)
{
struct tpci200_board *tpci200 = check_slot(dev);
__le16 __iomem *addr;
if (!tpci200)
return -ENODEV;
addr = &tpci200->info->interface_regs->control[dev->slot];
return (ioread16(addr) & TPCI200_CLK32) ? 32 : 8;
}
static int tpci200_set_clockrate(struct ipack_device *dev, int mherz)
{
struct tpci200_board *tpci200 = check_slot(dev);
__le16 __iomem *addr;
if (!tpci200)
return -ENODEV;
addr = &tpci200->info->interface_regs->control[dev->slot];
switch (mherz) {
case 8:
tpci200_clear_mask(tpci200, addr, TPCI200_CLK32);
break;
case 32:
tpci200_set_mask(tpci200, addr, TPCI200_CLK32);
break;
default:
return -EINVAL;
}
return 0;
}
static int tpci200_get_error(struct ipack_device *dev)
{
struct tpci200_board *tpci200 = check_slot(dev);
__le16 __iomem *addr;
u16 mask;
if (!tpci200)
return -ENODEV;
addr = &tpci200->info->interface_regs->status;
mask = tpci200_status_error[dev->slot];
return (ioread16(addr) & mask) ? 1 : 0;
}
static int tpci200_get_timeout(struct ipack_device *dev)
{
struct tpci200_board *tpci200 = check_slot(dev);
__le16 __iomem *addr;
u16 mask;
if (!tpci200)
return -ENODEV;
addr = &tpci200->info->interface_regs->status;
mask = tpci200_status_timeout[dev->slot];
return (ioread16(addr) & mask) ? 1 : 0;
}
static int tpci200_reset_timeout(struct ipack_device *dev)
{
struct tpci200_board *tpci200 = check_slot(dev);
__le16 __iomem *addr;
u16 mask;
if (!tpci200)
return -ENODEV;
addr = &tpci200->info->interface_regs->status;
mask = tpci200_status_timeout[dev->slot];
iowrite16(mask, addr);
return 0;
}
static void tpci200_uninstall(struct tpci200_board *tpci200)
{
tpci200_unregister(tpci200);
kfree(tpci200->slots);
}
static const struct ipack_bus_ops tpci200_bus_ops = {
.request_irq = tpci200_request_irq,
.free_irq = tpci200_free_irq,
.get_clockrate = tpci200_get_clockrate,
.set_clockrate = tpci200_set_clockrate,
.get_error = tpci200_get_error,
.get_timeout = tpci200_get_timeout,
.reset_timeout = tpci200_reset_timeout,
};
static int tpci200_install(struct tpci200_board *tpci200)
{
int res;
tpci200->slots = kzalloc(
TPCI200_NB_SLOT * sizeof(struct tpci200_slot), GFP_KERNEL);
if (tpci200->slots == NULL)
return -ENOMEM;
res = tpci200_register(tpci200);
if (res) {
kfree(tpci200->slots);
tpci200->slots = NULL;
return res;
}
mutex_init(&tpci200->mutex);
return 0;
}
static void tpci200_release_device(struct ipack_device *dev)
{
kfree(dev);
}
static int tpci200_create_device(struct tpci200_board *tpci200, int i)
{
int ret;
enum ipack_space space;
struct ipack_device *dev =
kzalloc(sizeof(struct ipack_device), GFP_KERNEL);
if (!dev)
return -ENOMEM;
dev->slot = i;
dev->bus = tpci200->info->ipack_bus;
dev->release = tpci200_release_device;
for (space = 0; space < IPACK_SPACE_COUNT; space++) {
dev->region[space].start =
tpci200->mod_mem[space]
+ tpci200_space_interval[space] * i;
dev->region[space].size = tpci200_space_size[space];
}
ret = ipack_device_init(dev);
if (ret < 0) {
ipack_put_device(dev);
return ret;
}
ret = ipack_device_add(dev);
if (ret < 0)
ipack_put_device(dev);
return ret;
}
static int tpci200_pci_probe(struct pci_dev *pdev,
const struct pci_device_id *id)
{
int ret, i;
struct tpci200_board *tpci200;
u32 reg32;
tpci200 = kzalloc(sizeof(struct tpci200_board), GFP_KERNEL);
if (!tpci200)
return -ENOMEM;
tpci200->info = kzalloc(sizeof(struct tpci200_infos), GFP_KERNEL);
if (!tpci200->info) {
ret = -ENOMEM;
goto out_err_info;
}
pci_dev_get(pdev);
/* Obtain a mapping of the carrier's PCI configuration registers */
ret = pci_request_region(pdev, TPCI200_CFG_MEM_BAR,
KBUILD_MODNAME " Configuration Memory");
if (ret) {
dev_err(&pdev->dev, "Failed to allocate PCI Configuration Memory");
ret = -EBUSY;
goto out_err_pci_request;
}
tpci200->info->cfg_regs = ioremap_nocache(
pci_resource_start(pdev, TPCI200_CFG_MEM_BAR),
pci_resource_len(pdev, TPCI200_CFG_MEM_BAR));
if (!tpci200->info->cfg_regs) {
dev_err(&pdev->dev, "Failed to map PCI Configuration Memory");
ret = -EFAULT;
goto out_err_ioremap;
}
/* Disable byte swapping for 16 bit IP module access. This will ensure
* that the Industrypack big endian byte order is preserved by the
* carrier. */
reg32 = ioread32(tpci200->info->cfg_regs + LAS1_DESC);
reg32 |= 1 << LAS_BIT_BIGENDIAN;
iowrite32(reg32, tpci200->info->cfg_regs + LAS1_DESC);
reg32 = ioread32(tpci200->info->cfg_regs + LAS2_DESC);
reg32 |= 1 << LAS_BIT_BIGENDIAN;
iowrite32(reg32, tpci200->info->cfg_regs + LAS2_DESC);
/* Save struct pci_dev pointer */
tpci200->info->pdev = pdev;
tpci200->info->id_table = (struct pci_device_id *)id;
/* register the device and initialize it */
ret = tpci200_install(tpci200);
if (ret) {
dev_err(&pdev->dev, "error during tpci200 install\n");
ret = -ENODEV;
goto out_err_install;
}
/* Register the carrier in the industry pack bus driver */
tpci200->info->ipack_bus = ipack_bus_register(&pdev->dev,
TPCI200_NB_SLOT,
&tpci200_bus_ops,
THIS_MODULE);
if (!tpci200->info->ipack_bus) {
dev_err(&pdev->dev,
"error registering the carrier on ipack driver\n");
ret = -EFAULT;
goto out_err_bus_register;
}
/* save the bus number given by ipack to logging purpose */
tpci200->number = tpci200->info->ipack_bus->bus_nr;
dev_set_drvdata(&pdev->dev, tpci200);
for (i = 0; i < TPCI200_NB_SLOT; i++)
tpci200_create_device(tpci200, i);
return 0;
out_err_bus_register:
tpci200_uninstall(tpci200);
out_err_install:
iounmap(tpci200->info->cfg_regs);
out_err_ioremap:
pci_release_region(pdev, TPCI200_CFG_MEM_BAR);
out_err_pci_request:
pci_dev_put(pdev);
kfree(tpci200->info);
out_err_info:
kfree(tpci200);
return ret;
}
static void __tpci200_pci_remove(struct tpci200_board *tpci200)
{
ipack_bus_unregister(tpci200->info->ipack_bus);
tpci200_uninstall(tpci200);
kfree(tpci200->info);
kfree(tpci200);
}
static void tpci200_pci_remove(struct pci_dev *dev)
{
struct tpci200_board *tpci200 = pci_get_drvdata(dev);
__tpci200_pci_remove(tpci200);
}
static const struct pci_device_id tpci200_idtable[] = {
{ TPCI200_VENDOR_ID, TPCI200_DEVICE_ID, TPCI200_SUBVENDOR_ID,
TPCI200_SUBDEVICE_ID },
{ 0, },
};
MODULE_DEVICE_TABLE(pci, tpci200_idtable);
static struct pci_driver tpci200_pci_drv = {
.name = "tpci200",
.id_table = tpci200_idtable,
.probe = tpci200_pci_probe,
.remove = tpci200_pci_remove,
};
module_pci_driver(tpci200_pci_drv);
MODULE_DESCRIPTION("TEWS TPCI-200 device driver");
MODULE_LICENSE("GPL");