mmc: Driver for CB710/720 memory card reader (MMC part)
The code is divided in two parts. There is a virtual 'bus' driver
that handles PCI device and registers three new devices one per card
reader type. The other driver handles SD/MMC part of the reader.
Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Signed-off-by: Pierre Ossman <pierre@ossman.eu>
diff --git a/drivers/misc/cb710/core.c b/drivers/misc/cb710/core.c
new file mode 100644
index 0000000..b14eab0
--- /dev/null
+++ b/drivers/misc/cb710/core.c
@@ -0,0 +1,357 @@
+/*
+ * cb710/core.c
+ *
+ * Copyright by Michał Mirosław, 2008-2009
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/pci.h>
+#include <linux/spinlock.h>
+#include <linux/idr.h>
+#include <linux/cb710.h>
+
+static DEFINE_IDA(cb710_ida);
+static DEFINE_SPINLOCK(cb710_ida_lock);
+
+void cb710_pci_update_config_reg(struct pci_dev *pdev,
+ int reg, uint32_t mask, uint32_t xor)
+{
+ u32 rval;
+
+ pci_read_config_dword(pdev, reg, &rval);
+ rval = (rval & mask) ^ xor;
+ pci_write_config_dword(pdev, reg, rval);
+}
+EXPORT_SYMBOL_GPL(cb710_pci_update_config_reg);
+
+/* Some magic writes based on Windows driver init code */
+static int __devinit cb710_pci_configure(struct pci_dev *pdev)
+{
+ unsigned int devfn = PCI_DEVFN(PCI_SLOT(pdev->devfn), 0);
+ struct pci_dev *pdev0 = pci_get_slot(pdev->bus, devfn);
+ u32 val;
+
+ cb710_pci_update_config_reg(pdev, 0x48,
+ ~0x000000FF, 0x0000003F);
+
+ pci_read_config_dword(pdev, 0x48, &val);
+ if (val & 0x80000000)
+ return 0;
+
+ if (!pdev0)
+ return -ENODEV;
+
+ if (pdev0->vendor == PCI_VENDOR_ID_ENE
+ && pdev0->device == PCI_DEVICE_ID_ENE_720) {
+ cb710_pci_update_config_reg(pdev0, 0x8C,
+ ~0x00F00000, 0x00100000);
+ cb710_pci_update_config_reg(pdev0, 0xB0,
+ ~0x08000000, 0x08000000);
+ }
+
+ cb710_pci_update_config_reg(pdev0, 0x8C,
+ ~0x00000F00, 0x00000200);
+ cb710_pci_update_config_reg(pdev0, 0x90,
+ ~0x00060000, 0x00040000);
+
+ pci_dev_put(pdev0);
+
+ return 0;
+}
+
+static irqreturn_t cb710_irq_handler(int irq, void *data)
+{
+ struct cb710_chip *chip = data;
+ struct cb710_slot *slot = &chip->slot[0];
+ irqreturn_t handled = IRQ_NONE;
+ unsigned nr;
+
+ spin_lock(&chip->irq_lock); /* incl. smp_rmb() */
+
+ for (nr = chip->slots; nr; ++slot, --nr) {
+ cb710_irq_handler_t handler_func = slot->irq_handler;
+ if (handler_func && handler_func(slot))
+ handled = IRQ_HANDLED;
+ }
+
+ spin_unlock(&chip->irq_lock);
+
+ return handled;
+}
+
+static void cb710_release_slot(struct device *dev)
+{
+#ifdef CONFIG_CB710_DEBUG_ASSUMPTIONS
+ struct cb710_slot *slot = cb710_pdev_to_slot(to_platform_device(dev));
+ struct cb710_chip *chip = cb710_slot_to_chip(slot);
+
+ /* slot struct can be freed now */
+ atomic_dec(&chip->slot_refs_count);
+#endif
+}
+
+static int __devinit cb710_register_slot(struct cb710_chip *chip,
+ unsigned slot_mask, unsigned io_offset, const char *name)
+{
+ int nr = chip->slots;
+ struct cb710_slot *slot = &chip->slot[nr];
+ int err;
+
+ dev_dbg(cb710_chip_dev(chip),
+ "register: %s.%d; slot %d; mask %d; IO offset: 0x%02X\n",
+ name, chip->platform_id, nr, slot_mask, io_offset);
+
+ /* slot->irq_handler == NULL here; this needs to be
+ * seen before platform_device_register() */
+ ++chip->slots;
+ smp_wmb();
+
+ slot->iobase = chip->iobase + io_offset;
+ slot->pdev.name = name;
+ slot->pdev.id = chip->platform_id;
+ slot->pdev.dev.parent = &chip->pdev->dev;
+ slot->pdev.dev.release = cb710_release_slot;
+
+ err = platform_device_register(&slot->pdev);
+
+#ifdef CONFIG_CB710_DEBUG_ASSUMPTIONS
+ atomic_inc(&chip->slot_refs_count);
+#endif
+
+ if (err) {
+ /* device_initialize() called from platform_device_register()
+ * wants this on error path */
+ platform_device_put(&slot->pdev);
+
+ /* slot->irq_handler == NULL here anyway, so no lock needed */
+ --chip->slots;
+ return err;
+ }
+
+ chip->slot_mask |= slot_mask;
+
+ return 0;
+}
+
+static void cb710_unregister_slot(struct cb710_chip *chip,
+ unsigned slot_mask)
+{
+ int nr = chip->slots - 1;
+
+ if (!(chip->slot_mask & slot_mask))
+ return;
+
+ platform_device_unregister(&chip->slot[nr].pdev);
+
+ /* complementary to spin_unlock() in cb710_set_irq_handler() */
+ smp_rmb();
+ BUG_ON(chip->slot[nr].irq_handler != NULL);
+
+ /* slot->irq_handler == NULL here, so no lock needed */
+ --chip->slots;
+ chip->slot_mask &= ~slot_mask;
+}
+
+void cb710_set_irq_handler(struct cb710_slot *slot,
+ cb710_irq_handler_t handler)
+{
+ struct cb710_chip *chip = cb710_slot_to_chip(slot);
+ unsigned long flags;
+
+ spin_lock_irqsave(&chip->irq_lock, flags);
+ slot->irq_handler = handler;
+ spin_unlock_irqrestore(&chip->irq_lock, flags);
+}
+EXPORT_SYMBOL_GPL(cb710_set_irq_handler);
+
+#ifdef CONFIG_PM
+
+static int cb710_suspend(struct pci_dev *pdev, pm_message_t state)
+{
+ struct cb710_chip *chip = pci_get_drvdata(pdev);
+
+ free_irq(pdev->irq, chip);
+ pci_save_state(pdev);
+ pci_disable_device(pdev);
+ if (state.event & PM_EVENT_SLEEP)
+ pci_set_power_state(pdev, PCI_D3cold);
+ return 0;
+}
+
+static int cb710_resume(struct pci_dev *pdev)
+{
+ struct cb710_chip *chip = pci_get_drvdata(pdev);
+ int err;
+
+ pci_set_power_state(pdev, PCI_D0);
+ pci_restore_state(pdev);
+ err = pcim_enable_device(pdev);
+ if (err)
+ return err;
+
+ return devm_request_irq(&pdev->dev, pdev->irq,
+ cb710_irq_handler, IRQF_SHARED, KBUILD_MODNAME, chip);
+}
+
+#endif /* CONFIG_PM */
+
+static int __devinit cb710_probe(struct pci_dev *pdev,
+ const struct pci_device_id *ent)
+{
+ struct cb710_chip *chip;
+ unsigned long flags;
+ u32 val;
+ int err;
+ int n = 0;
+
+ err = cb710_pci_configure(pdev);
+ if (err)
+ return err;
+
+ /* this is actually magic... */
+ pci_read_config_dword(pdev, 0x48, &val);
+ if (!(val & 0x80000000)) {
+ pci_write_config_dword(pdev, 0x48, val|0x71000000);
+ pci_read_config_dword(pdev, 0x48, &val);
+ }
+
+ dev_dbg(&pdev->dev, "PCI config[0x48] = 0x%08X\n", val);
+ if (!(val & 0x70000000))
+ return -ENODEV;
+ val = (val >> 28) & 7;
+ if (val & CB710_SLOT_MMC)
+ ++n;
+ if (val & CB710_SLOT_MS)
+ ++n;
+ if (val & CB710_SLOT_SM)
+ ++n;
+
+ chip = devm_kzalloc(&pdev->dev,
+ sizeof(*chip) + n * sizeof(*chip->slot), GFP_KERNEL);
+ if (!chip)
+ return -ENOMEM;
+
+ err = pcim_enable_device(pdev);
+ if (err)
+ return err;
+
+ err = pcim_iomap_regions(pdev, 0x0001, KBUILD_MODNAME);
+ if (err)
+ return err;
+
+ chip->pdev = pdev;
+ chip->iobase = pcim_iomap_table(pdev)[0];
+
+ pci_set_drvdata(pdev, chip);
+
+ err = devm_request_irq(&pdev->dev, pdev->irq,
+ cb710_irq_handler, IRQF_SHARED, KBUILD_MODNAME, chip);
+ if (err)
+ return err;
+
+ do {
+ if (!ida_pre_get(&cb710_ida, GFP_KERNEL))
+ return -ENOMEM;
+
+ spin_lock_irqsave(&cb710_ida_lock, flags);
+ err = ida_get_new(&cb710_ida, &chip->platform_id);
+ spin_unlock_irqrestore(&cb710_ida_lock, flags);
+
+ if (err && err != -EAGAIN)
+ return err;
+ } while (err);
+
+
+ dev_info(&pdev->dev, "id %d, IO 0x%p, IRQ %d\n",
+ chip->platform_id, chip->iobase, pdev->irq);
+
+ if (val & CB710_SLOT_MMC) { /* MMC/SD slot */
+ err = cb710_register_slot(chip,
+ CB710_SLOT_MMC, 0x00, "cb710-mmc");
+ if (err)
+ return err;
+ }
+
+ if (val & CB710_SLOT_MS) { /* MemoryStick slot */
+ err = cb710_register_slot(chip,
+ CB710_SLOT_MS, 0x40, "cb710-ms");
+ if (err)
+ goto unreg_mmc;
+ }
+
+ if (val & CB710_SLOT_SM) { /* SmartMedia slot */
+ err = cb710_register_slot(chip,
+ CB710_SLOT_SM, 0x60, "cb710-sm");
+ if (err)
+ goto unreg_ms;
+ }
+
+ return 0;
+unreg_ms:
+ cb710_unregister_slot(chip, CB710_SLOT_MS);
+unreg_mmc:
+ cb710_unregister_slot(chip, CB710_SLOT_MMC);
+
+#ifdef CONFIG_CB710_DEBUG_ASSUMPTIONS
+ BUG_ON(atomic_read(&chip->slot_refs_count) != 0);
+#endif
+ return err;
+}
+
+static void __devexit cb710_remove_one(struct pci_dev *pdev)
+{
+ struct cb710_chip *chip = pci_get_drvdata(pdev);
+ unsigned long flags;
+
+ cb710_unregister_slot(chip, CB710_SLOT_SM);
+ cb710_unregister_slot(chip, CB710_SLOT_MS);
+ cb710_unregister_slot(chip, CB710_SLOT_MMC);
+#ifdef CONFIG_CB710_DEBUG_ASSUMPTIONS
+ BUG_ON(atomic_read(&chip->slot_refs_count) != 0);
+#endif
+
+ spin_lock_irqsave(&cb710_ida_lock, flags);
+ ida_remove(&cb710_ida, chip->platform_id);
+ spin_unlock_irqrestore(&cb710_ida_lock, flags);
+}
+
+static const struct pci_device_id cb710_pci_tbl[] = {
+ { PCI_VENDOR_ID_ENE, PCI_DEVICE_ID_ENE_CB710_FLASH,
+ PCI_ANY_ID, PCI_ANY_ID, },
+ { 0, }
+};
+
+static struct pci_driver cb710_driver = {
+ .name = KBUILD_MODNAME,
+ .id_table = cb710_pci_tbl,
+ .probe = cb710_probe,
+ .remove = __devexit_p(cb710_remove_one),
+#ifdef CONFIG_PM
+ .suspend = cb710_suspend,
+ .resume = cb710_resume,
+#endif
+};
+
+static int __init cb710_init_module(void)
+{
+ return pci_register_driver(&cb710_driver);
+}
+
+static void __exit cb710_cleanup_module(void)
+{
+ pci_unregister_driver(&cb710_driver);
+ ida_destroy(&cb710_ida);
+}
+
+module_init(cb710_init_module);
+module_exit(cb710_cleanup_module);
+
+MODULE_AUTHOR("Michał Mirosław <mirq-linux@rere.qmqm.pl>");
+MODULE_DESCRIPTION("ENE CB710 memory card reader driver");
+MODULE_LICENSE("GPL");
+MODULE_DEVICE_TABLE(pci, cb710_pci_tbl);