330 lines
7.6 KiB
C
330 lines
7.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* cb710/core.c
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*
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* Copyright by Michał Mirosław, 2008-2009
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/pci.h>
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#include <linux/spinlock.h>
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#include <linux/idr.h>
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#include <linux/cb710.h>
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#include <linux/gfp.h>
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static DEFINE_IDA(cb710_ida);
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void cb710_pci_update_config_reg(struct pci_dev *pdev,
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int reg, uint32_t mask, uint32_t xor)
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{
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u32 rval;
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pci_read_config_dword(pdev, reg, &rval);
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rval = (rval & mask) ^ xor;
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pci_write_config_dword(pdev, reg, rval);
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}
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EXPORT_SYMBOL_GPL(cb710_pci_update_config_reg);
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/* Some magic writes based on Windows driver init code */
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static int cb710_pci_configure(struct pci_dev *pdev)
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{
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unsigned int devfn = PCI_DEVFN(PCI_SLOT(pdev->devfn), 0);
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struct pci_dev *pdev0;
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u32 val;
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cb710_pci_update_config_reg(pdev, 0x48,
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~0x000000FF, 0x0000003F);
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pci_read_config_dword(pdev, 0x48, &val);
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if (val & 0x80000000)
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return 0;
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pdev0 = pci_get_slot(pdev->bus, devfn);
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if (!pdev0)
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return -ENODEV;
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if (pdev0->vendor == PCI_VENDOR_ID_ENE
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&& pdev0->device == PCI_DEVICE_ID_ENE_720) {
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cb710_pci_update_config_reg(pdev0, 0x8C,
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~0x00F00000, 0x00100000);
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cb710_pci_update_config_reg(pdev0, 0xB0,
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~0x08000000, 0x08000000);
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}
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cb710_pci_update_config_reg(pdev0, 0x8C,
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~0x00000F00, 0x00000200);
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cb710_pci_update_config_reg(pdev0, 0x90,
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~0x00060000, 0x00040000);
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pci_dev_put(pdev0);
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return 0;
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}
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static irqreturn_t cb710_irq_handler(int irq, void *data)
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{
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struct cb710_chip *chip = data;
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struct cb710_slot *slot = &chip->slot[0];
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irqreturn_t handled = IRQ_NONE;
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unsigned nr;
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spin_lock(&chip->irq_lock); /* incl. smp_rmb() */
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for (nr = chip->slots; nr; ++slot, --nr) {
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cb710_irq_handler_t handler_func = slot->irq_handler;
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if (handler_func && handler_func(slot))
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handled = IRQ_HANDLED;
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}
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spin_unlock(&chip->irq_lock);
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return handled;
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}
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static void cb710_release_slot(struct device *dev)
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{
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#ifdef CONFIG_CB710_DEBUG_ASSUMPTIONS
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struct cb710_slot *slot = cb710_pdev_to_slot(to_platform_device(dev));
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struct cb710_chip *chip = cb710_slot_to_chip(slot);
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/* slot struct can be freed now */
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atomic_dec(&chip->slot_refs_count);
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#endif
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}
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static int cb710_register_slot(struct cb710_chip *chip,
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unsigned slot_mask, unsigned io_offset, const char *name)
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{
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int nr = chip->slots;
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struct cb710_slot *slot = &chip->slot[nr];
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int err;
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dev_dbg(cb710_chip_dev(chip),
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"register: %s.%d; slot %d; mask %d; IO offset: 0x%02X\n",
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name, chip->platform_id, nr, slot_mask, io_offset);
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/* slot->irq_handler == NULL here; this needs to be
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* seen before platform_device_register() */
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++chip->slots;
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smp_wmb();
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slot->iobase = chip->iobase + io_offset;
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slot->pdev.name = name;
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slot->pdev.id = chip->platform_id;
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slot->pdev.dev.parent = &chip->pdev->dev;
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slot->pdev.dev.release = cb710_release_slot;
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err = platform_device_register(&slot->pdev);
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#ifdef CONFIG_CB710_DEBUG_ASSUMPTIONS
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atomic_inc(&chip->slot_refs_count);
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#endif
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if (err) {
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/* device_initialize() called from platform_device_register()
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* wants this on error path */
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platform_device_put(&slot->pdev);
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/* slot->irq_handler == NULL here anyway, so no lock needed */
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--chip->slots;
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return err;
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}
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chip->slot_mask |= slot_mask;
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return 0;
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}
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static void cb710_unregister_slot(struct cb710_chip *chip,
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unsigned slot_mask)
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{
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int nr = chip->slots - 1;
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if (!(chip->slot_mask & slot_mask))
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return;
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platform_device_unregister(&chip->slot[nr].pdev);
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/* complementary to spin_unlock() in cb710_set_irq_handler() */
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smp_rmb();
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BUG_ON(chip->slot[nr].irq_handler != NULL);
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/* slot->irq_handler == NULL here, so no lock needed */
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--chip->slots;
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chip->slot_mask &= ~slot_mask;
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}
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void cb710_set_irq_handler(struct cb710_slot *slot,
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cb710_irq_handler_t handler)
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{
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struct cb710_chip *chip = cb710_slot_to_chip(slot);
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unsigned long flags;
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spin_lock_irqsave(&chip->irq_lock, flags);
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slot->irq_handler = handler;
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spin_unlock_irqrestore(&chip->irq_lock, flags);
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}
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EXPORT_SYMBOL_GPL(cb710_set_irq_handler);
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static int __maybe_unused cb710_suspend(struct device *dev_d)
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{
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struct pci_dev *pdev = to_pci_dev(dev_d);
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struct cb710_chip *chip = pci_get_drvdata(pdev);
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devm_free_irq(&pdev->dev, pdev->irq, chip);
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return 0;
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}
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static int __maybe_unused cb710_resume(struct device *dev_d)
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{
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struct pci_dev *pdev = to_pci_dev(dev_d);
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struct cb710_chip *chip = pci_get_drvdata(pdev);
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return devm_request_irq(&pdev->dev, pdev->irq,
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cb710_irq_handler, IRQF_SHARED, KBUILD_MODNAME, chip);
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}
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static int cb710_probe(struct pci_dev *pdev,
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const struct pci_device_id *ent)
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{
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struct cb710_chip *chip;
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u32 val;
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int err;
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int n = 0;
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err = cb710_pci_configure(pdev);
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if (err)
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return err;
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/* this is actually magic... */
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pci_read_config_dword(pdev, 0x48, &val);
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if (!(val & 0x80000000)) {
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pci_write_config_dword(pdev, 0x48, val|0x71000000);
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pci_read_config_dword(pdev, 0x48, &val);
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}
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dev_dbg(&pdev->dev, "PCI config[0x48] = 0x%08X\n", val);
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if (!(val & 0x70000000))
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return -ENODEV;
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val = (val >> 28) & 7;
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if (val & CB710_SLOT_MMC)
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++n;
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if (val & CB710_SLOT_MS)
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++n;
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if (val & CB710_SLOT_SM)
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++n;
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chip = devm_kzalloc(&pdev->dev, struct_size(chip, slot, n),
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GFP_KERNEL);
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if (!chip)
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return -ENOMEM;
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err = pcim_enable_device(pdev);
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if (err)
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return err;
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err = pcim_iomap_regions(pdev, 0x0001, KBUILD_MODNAME);
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if (err)
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return err;
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spin_lock_init(&chip->irq_lock);
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chip->pdev = pdev;
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chip->iobase = pcim_iomap_table(pdev)[0];
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pci_set_drvdata(pdev, chip);
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err = devm_request_irq(&pdev->dev, pdev->irq,
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cb710_irq_handler, IRQF_SHARED, KBUILD_MODNAME, chip);
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if (err)
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return err;
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err = ida_alloc(&cb710_ida, GFP_KERNEL);
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if (err < 0)
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return err;
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chip->platform_id = err;
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dev_info(&pdev->dev, "id %d, IO 0x%p, IRQ %d\n",
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chip->platform_id, chip->iobase, pdev->irq);
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if (val & CB710_SLOT_MMC) { /* MMC/SD slot */
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err = cb710_register_slot(chip,
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CB710_SLOT_MMC, 0x00, "cb710-mmc");
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if (err)
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return err;
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}
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if (val & CB710_SLOT_MS) { /* MemoryStick slot */
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err = cb710_register_slot(chip,
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CB710_SLOT_MS, 0x40, "cb710-ms");
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if (err)
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goto unreg_mmc;
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}
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if (val & CB710_SLOT_SM) { /* SmartMedia slot */
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err = cb710_register_slot(chip,
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CB710_SLOT_SM, 0x60, "cb710-sm");
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if (err)
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goto unreg_ms;
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}
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return 0;
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unreg_ms:
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cb710_unregister_slot(chip, CB710_SLOT_MS);
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unreg_mmc:
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cb710_unregister_slot(chip, CB710_SLOT_MMC);
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#ifdef CONFIG_CB710_DEBUG_ASSUMPTIONS
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BUG_ON(atomic_read(&chip->slot_refs_count) != 0);
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#endif
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return err;
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}
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static void cb710_remove_one(struct pci_dev *pdev)
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{
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struct cb710_chip *chip = pci_get_drvdata(pdev);
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cb710_unregister_slot(chip, CB710_SLOT_SM);
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cb710_unregister_slot(chip, CB710_SLOT_MS);
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cb710_unregister_slot(chip, CB710_SLOT_MMC);
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#ifdef CONFIG_CB710_DEBUG_ASSUMPTIONS
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BUG_ON(atomic_read(&chip->slot_refs_count) != 0);
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#endif
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ida_free(&cb710_ida, chip->platform_id);
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}
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static const struct pci_device_id cb710_pci_tbl[] = {
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{ PCI_VENDOR_ID_ENE, PCI_DEVICE_ID_ENE_CB710_FLASH,
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PCI_ANY_ID, PCI_ANY_ID, },
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{ 0, }
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};
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static SIMPLE_DEV_PM_OPS(cb710_pm_ops, cb710_suspend, cb710_resume);
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static struct pci_driver cb710_driver = {
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.name = KBUILD_MODNAME,
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.id_table = cb710_pci_tbl,
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.probe = cb710_probe,
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.remove = cb710_remove_one,
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.driver.pm = &cb710_pm_ops,
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};
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static int __init cb710_init_module(void)
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{
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return pci_register_driver(&cb710_driver);
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}
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static void __exit cb710_cleanup_module(void)
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{
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pci_unregister_driver(&cb710_driver);
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ida_destroy(&cb710_ida);
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}
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module_init(cb710_init_module);
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module_exit(cb710_cleanup_module);
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MODULE_AUTHOR("Michał Mirosław <mirq-linux@rere.qmqm.pl>");
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MODULE_DESCRIPTION("ENE CB710 memory card reader driver");
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MODULE_LICENSE("GPL");
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MODULE_DEVICE_TABLE(pci, cb710_pci_tbl);
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