mirror of https://gitee.com/openkylin/linux.git
646 lines
16 KiB
C
646 lines
16 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/**
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* tpci200.c
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*
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* driver for the TEWS TPCI-200 device
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*
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* Copyright (C) 2009-2012 CERN (www.cern.ch)
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* Author: Nicolas Serafini, EIC2 SA
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* Author: Samuel Iglesias Gonsalvez <siglesias@igalia.com>
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*/
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#include <linux/module.h>
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#include <linux/slab.h>
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#include "tpci200.h"
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static const u16 tpci200_status_timeout[] = {
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TPCI200_A_TIMEOUT,
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TPCI200_B_TIMEOUT,
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TPCI200_C_TIMEOUT,
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TPCI200_D_TIMEOUT,
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};
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static const u16 tpci200_status_error[] = {
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TPCI200_A_ERROR,
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TPCI200_B_ERROR,
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TPCI200_C_ERROR,
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TPCI200_D_ERROR,
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};
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static const size_t tpci200_space_size[IPACK_SPACE_COUNT] = {
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[IPACK_IO_SPACE] = TPCI200_IO_SPACE_SIZE,
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[IPACK_ID_SPACE] = TPCI200_ID_SPACE_SIZE,
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[IPACK_INT_SPACE] = TPCI200_INT_SPACE_SIZE,
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[IPACK_MEM8_SPACE] = TPCI200_MEM8_SPACE_SIZE,
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[IPACK_MEM16_SPACE] = TPCI200_MEM16_SPACE_SIZE,
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};
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static const size_t tpci200_space_interval[IPACK_SPACE_COUNT] = {
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[IPACK_IO_SPACE] = TPCI200_IO_SPACE_INTERVAL,
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[IPACK_ID_SPACE] = TPCI200_ID_SPACE_INTERVAL,
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[IPACK_INT_SPACE] = TPCI200_INT_SPACE_INTERVAL,
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[IPACK_MEM8_SPACE] = TPCI200_MEM8_SPACE_INTERVAL,
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[IPACK_MEM16_SPACE] = TPCI200_MEM16_SPACE_INTERVAL,
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};
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static struct tpci200_board *check_slot(struct ipack_device *dev)
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{
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struct tpci200_board *tpci200;
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if (dev == NULL)
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return NULL;
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tpci200 = dev_get_drvdata(dev->bus->parent);
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if (tpci200 == NULL) {
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dev_info(&dev->dev, "carrier board not found\n");
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return NULL;
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}
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if (dev->slot >= TPCI200_NB_SLOT) {
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dev_info(&dev->dev,
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"Slot [%d:%d] doesn't exist! Last tpci200 slot is %d.\n",
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dev->bus->bus_nr, dev->slot, TPCI200_NB_SLOT-1);
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return NULL;
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}
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return tpci200;
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}
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static void tpci200_clear_mask(struct tpci200_board *tpci200,
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__le16 __iomem *addr, u16 mask)
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{
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unsigned long flags;
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spin_lock_irqsave(&tpci200->regs_lock, flags);
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iowrite16(ioread16(addr) & (~mask), addr);
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spin_unlock_irqrestore(&tpci200->regs_lock, flags);
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}
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static void tpci200_set_mask(struct tpci200_board *tpci200,
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__le16 __iomem *addr, u16 mask)
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{
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unsigned long flags;
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spin_lock_irqsave(&tpci200->regs_lock, flags);
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iowrite16(ioread16(addr) | mask, addr);
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spin_unlock_irqrestore(&tpci200->regs_lock, flags);
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}
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static void tpci200_unregister(struct tpci200_board *tpci200)
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{
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free_irq(tpci200->info->pdev->irq, (void *) tpci200);
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pci_iounmap(tpci200->info->pdev, tpci200->info->interface_regs);
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pci_iounmap(tpci200->info->pdev, tpci200->info->cfg_regs);
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pci_release_region(tpci200->info->pdev, TPCI200_IP_INTERFACE_BAR);
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pci_release_region(tpci200->info->pdev, TPCI200_IO_ID_INT_SPACES_BAR);
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pci_release_region(tpci200->info->pdev, TPCI200_MEM16_SPACE_BAR);
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pci_release_region(tpci200->info->pdev, TPCI200_MEM8_SPACE_BAR);
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pci_release_region(tpci200->info->pdev, TPCI200_CFG_MEM_BAR);
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pci_disable_device(tpci200->info->pdev);
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pci_dev_put(tpci200->info->pdev);
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}
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static void tpci200_enable_irq(struct tpci200_board *tpci200,
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int islot)
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{
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tpci200_set_mask(tpci200,
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&tpci200->info->interface_regs->control[islot],
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TPCI200_INT0_EN | TPCI200_INT1_EN);
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}
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static void tpci200_disable_irq(struct tpci200_board *tpci200,
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int islot)
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{
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tpci200_clear_mask(tpci200,
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&tpci200->info->interface_regs->control[islot],
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TPCI200_INT0_EN | TPCI200_INT1_EN);
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}
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static irqreturn_t tpci200_slot_irq(struct slot_irq *slot_irq)
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{
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irqreturn_t ret;
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if (!slot_irq)
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return -ENODEV;
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ret = slot_irq->handler(slot_irq->arg);
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return ret;
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}
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static irqreturn_t tpci200_interrupt(int irq, void *dev_id)
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{
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struct tpci200_board *tpci200 = (struct tpci200_board *) dev_id;
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struct slot_irq *slot_irq;
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irqreturn_t ret;
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u16 status_reg;
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int i;
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/* Read status register */
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status_reg = ioread16(&tpci200->info->interface_regs->status);
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/* Did we cause the interrupt? */
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if (!(status_reg & TPCI200_SLOT_INT_MASK))
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return IRQ_NONE;
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/* callback to the IRQ handler for the corresponding slot */
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rcu_read_lock();
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for (i = 0; i < TPCI200_NB_SLOT; i++) {
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if (!(status_reg & ((TPCI200_A_INT0 | TPCI200_A_INT1) << (2 * i))))
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continue;
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slot_irq = rcu_dereference(tpci200->slots[i].irq);
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ret = tpci200_slot_irq(slot_irq);
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if (ret == -ENODEV) {
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dev_info(&tpci200->info->pdev->dev,
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"No registered ISR for slot [%d:%d]!. IRQ will be disabled.\n",
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tpci200->number, i);
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tpci200_disable_irq(tpci200, i);
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}
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}
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rcu_read_unlock();
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return IRQ_HANDLED;
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}
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static int tpci200_free_irq(struct ipack_device *dev)
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{
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struct slot_irq *slot_irq;
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struct tpci200_board *tpci200;
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tpci200 = check_slot(dev);
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if (tpci200 == NULL)
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return -EINVAL;
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if (mutex_lock_interruptible(&tpci200->mutex))
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return -ERESTARTSYS;
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if (tpci200->slots[dev->slot].irq == NULL) {
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mutex_unlock(&tpci200->mutex);
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return -EINVAL;
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}
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tpci200_disable_irq(tpci200, dev->slot);
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slot_irq = tpci200->slots[dev->slot].irq;
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/* uninstall handler */
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RCU_INIT_POINTER(tpci200->slots[dev->slot].irq, NULL);
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synchronize_rcu();
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kfree(slot_irq);
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mutex_unlock(&tpci200->mutex);
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return 0;
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}
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static int tpci200_request_irq(struct ipack_device *dev,
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irqreturn_t (*handler)(void *), void *arg)
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{
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int res = 0;
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struct slot_irq *slot_irq;
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struct tpci200_board *tpci200;
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tpci200 = check_slot(dev);
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if (tpci200 == NULL)
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return -EINVAL;
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if (mutex_lock_interruptible(&tpci200->mutex))
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return -ERESTARTSYS;
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if (tpci200->slots[dev->slot].irq != NULL) {
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dev_err(&dev->dev,
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"Slot [%d:%d] IRQ already registered !\n",
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dev->bus->bus_nr,
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dev->slot);
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res = -EINVAL;
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goto out_unlock;
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}
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slot_irq = kzalloc(sizeof(struct slot_irq), GFP_KERNEL);
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if (slot_irq == NULL) {
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dev_err(&dev->dev,
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"Slot [%d:%d] unable to allocate memory for IRQ !\n",
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dev->bus->bus_nr, dev->slot);
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res = -ENOMEM;
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goto out_unlock;
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}
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/*
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* WARNING: Setup Interrupt Vector in the IndustryPack device
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* before an IRQ request.
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* Read the User Manual of your IndustryPack device to know
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* where to write the vector in memory.
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*/
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slot_irq->handler = handler;
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slot_irq->arg = arg;
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slot_irq->holder = dev;
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rcu_assign_pointer(tpci200->slots[dev->slot].irq, slot_irq);
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tpci200_enable_irq(tpci200, dev->slot);
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out_unlock:
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mutex_unlock(&tpci200->mutex);
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return res;
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}
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static int tpci200_register(struct tpci200_board *tpci200)
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{
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int i;
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int res;
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phys_addr_t ioidint_base;
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unsigned short slot_ctrl;
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if (pci_enable_device(tpci200->info->pdev) < 0)
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return -ENODEV;
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/* Request IP interface register (Bar 2) */
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res = pci_request_region(tpci200->info->pdev, TPCI200_IP_INTERFACE_BAR,
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"Carrier IP interface registers");
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if (res) {
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dev_err(&tpci200->info->pdev->dev,
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"(bn 0x%X, sn 0x%X) failed to allocate PCI resource for BAR 2 !",
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tpci200->info->pdev->bus->number,
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tpci200->info->pdev->devfn);
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goto out_disable_pci;
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}
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/* Request IO ID INT space (Bar 3) */
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res = pci_request_region(tpci200->info->pdev,
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TPCI200_IO_ID_INT_SPACES_BAR,
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"Carrier IO ID INT space");
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if (res) {
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dev_err(&tpci200->info->pdev->dev,
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"(bn 0x%X, sn 0x%X) failed to allocate PCI resource for BAR 3 !",
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tpci200->info->pdev->bus->number,
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tpci200->info->pdev->devfn);
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goto out_release_ip_space;
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}
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/* Request MEM8 space (Bar 5) */
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res = pci_request_region(tpci200->info->pdev, TPCI200_MEM8_SPACE_BAR,
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"Carrier MEM8 space");
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if (res) {
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dev_err(&tpci200->info->pdev->dev,
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"(bn 0x%X, sn 0x%X) failed to allocate PCI resource for BAR 5!",
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tpci200->info->pdev->bus->number,
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tpci200->info->pdev->devfn);
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goto out_release_ioid_int_space;
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}
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/* Request MEM16 space (Bar 4) */
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res = pci_request_region(tpci200->info->pdev, TPCI200_MEM16_SPACE_BAR,
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"Carrier MEM16 space");
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if (res) {
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dev_err(&tpci200->info->pdev->dev,
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"(bn 0x%X, sn 0x%X) failed to allocate PCI resource for BAR 4!",
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tpci200->info->pdev->bus->number,
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tpci200->info->pdev->devfn);
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goto out_release_mem8_space;
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}
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/* Map internal tpci200 driver user space */
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tpci200->info->interface_regs =
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ioremap(pci_resource_start(tpci200->info->pdev,
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TPCI200_IP_INTERFACE_BAR),
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TPCI200_IFACE_SIZE);
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if (!tpci200->info->interface_regs) {
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dev_err(&tpci200->info->pdev->dev,
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"(bn 0x%X, sn 0x%X) failed to map driver user space!",
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tpci200->info->pdev->bus->number,
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tpci200->info->pdev->devfn);
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res = -ENOMEM;
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goto out_release_mem8_space;
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}
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/* Initialize lock that protects interface_regs */
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spin_lock_init(&tpci200->regs_lock);
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ioidint_base = pci_resource_start(tpci200->info->pdev,
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TPCI200_IO_ID_INT_SPACES_BAR);
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tpci200->mod_mem[IPACK_IO_SPACE] = ioidint_base + TPCI200_IO_SPACE_OFF;
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tpci200->mod_mem[IPACK_ID_SPACE] = ioidint_base + TPCI200_ID_SPACE_OFF;
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tpci200->mod_mem[IPACK_INT_SPACE] =
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ioidint_base + TPCI200_INT_SPACE_OFF;
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tpci200->mod_mem[IPACK_MEM8_SPACE] =
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pci_resource_start(tpci200->info->pdev,
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TPCI200_MEM8_SPACE_BAR);
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tpci200->mod_mem[IPACK_MEM16_SPACE] =
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pci_resource_start(tpci200->info->pdev,
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TPCI200_MEM16_SPACE_BAR);
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/* Set the default parameters of the slot
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* INT0 disabled, level sensitive
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* INT1 disabled, level sensitive
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* error interrupt disabled
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* timeout interrupt disabled
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* recover time disabled
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* clock rate 8 MHz
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*/
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slot_ctrl = 0;
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for (i = 0; i < TPCI200_NB_SLOT; i++)
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writew(slot_ctrl, &tpci200->info->interface_regs->control[i]);
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res = request_irq(tpci200->info->pdev->irq,
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tpci200_interrupt, IRQF_SHARED,
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KBUILD_MODNAME, (void *) tpci200);
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if (res) {
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dev_err(&tpci200->info->pdev->dev,
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"(bn 0x%X, sn 0x%X) unable to register IRQ !",
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tpci200->info->pdev->bus->number,
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tpci200->info->pdev->devfn);
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goto out_release_ioid_int_space;
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}
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return 0;
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out_release_mem8_space:
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pci_release_region(tpci200->info->pdev, TPCI200_MEM8_SPACE_BAR);
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out_release_ioid_int_space:
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pci_release_region(tpci200->info->pdev, TPCI200_IO_ID_INT_SPACES_BAR);
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out_release_ip_space:
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pci_release_region(tpci200->info->pdev, TPCI200_IP_INTERFACE_BAR);
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out_disable_pci:
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pci_disable_device(tpci200->info->pdev);
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return res;
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}
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static int tpci200_get_clockrate(struct ipack_device *dev)
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{
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struct tpci200_board *tpci200 = check_slot(dev);
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__le16 __iomem *addr;
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if (!tpci200)
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return -ENODEV;
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addr = &tpci200->info->interface_regs->control[dev->slot];
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return (ioread16(addr) & TPCI200_CLK32) ? 32 : 8;
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}
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static int tpci200_set_clockrate(struct ipack_device *dev, int mherz)
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{
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struct tpci200_board *tpci200 = check_slot(dev);
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__le16 __iomem *addr;
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if (!tpci200)
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return -ENODEV;
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addr = &tpci200->info->interface_regs->control[dev->slot];
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switch (mherz) {
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case 8:
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tpci200_clear_mask(tpci200, addr, TPCI200_CLK32);
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break;
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case 32:
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tpci200_set_mask(tpci200, addr, TPCI200_CLK32);
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break;
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default:
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return -EINVAL;
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}
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return 0;
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}
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static int tpci200_get_error(struct ipack_device *dev)
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{
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struct tpci200_board *tpci200 = check_slot(dev);
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__le16 __iomem *addr;
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u16 mask;
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if (!tpci200)
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return -ENODEV;
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addr = &tpci200->info->interface_regs->status;
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mask = tpci200_status_error[dev->slot];
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return (ioread16(addr) & mask) ? 1 : 0;
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}
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static int tpci200_get_timeout(struct ipack_device *dev)
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{
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struct tpci200_board *tpci200 = check_slot(dev);
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__le16 __iomem *addr;
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u16 mask;
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if (!tpci200)
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return -ENODEV;
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addr = &tpci200->info->interface_regs->status;
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mask = tpci200_status_timeout[dev->slot];
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return (ioread16(addr) & mask) ? 1 : 0;
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}
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static int tpci200_reset_timeout(struct ipack_device *dev)
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{
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struct tpci200_board *tpci200 = check_slot(dev);
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__le16 __iomem *addr;
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u16 mask;
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if (!tpci200)
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return -ENODEV;
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addr = &tpci200->info->interface_regs->status;
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mask = tpci200_status_timeout[dev->slot];
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iowrite16(mask, addr);
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return 0;
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}
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static void tpci200_uninstall(struct tpci200_board *tpci200)
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{
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tpci200_unregister(tpci200);
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kfree(tpci200->slots);
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}
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static const struct ipack_bus_ops tpci200_bus_ops = {
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.request_irq = tpci200_request_irq,
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.free_irq = tpci200_free_irq,
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.get_clockrate = tpci200_get_clockrate,
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.set_clockrate = tpci200_set_clockrate,
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.get_error = tpci200_get_error,
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.get_timeout = tpci200_get_timeout,
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.reset_timeout = tpci200_reset_timeout,
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};
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static int tpci200_install(struct tpci200_board *tpci200)
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{
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int res;
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tpci200->slots = kcalloc(TPCI200_NB_SLOT, sizeof(struct tpci200_slot),
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GFP_KERNEL);
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if (tpci200->slots == NULL)
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return -ENOMEM;
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res = tpci200_register(tpci200);
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if (res) {
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kfree(tpci200->slots);
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tpci200->slots = NULL;
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return res;
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}
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mutex_init(&tpci200->mutex);
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return 0;
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}
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static void tpci200_release_device(struct ipack_device *dev)
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{
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kfree(dev);
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}
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static int tpci200_create_device(struct tpci200_board *tpci200, int i)
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{
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int ret;
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enum ipack_space space;
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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(
|
|
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");
|