linux/drivers/misc/cb710/core.c

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/*
* 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/pci.h>
#include <linux/spinlock.h>
#include <linux/idr.h>
#include <linux/cb710.h>
include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h percpu.h is included by sched.h and module.h and thus ends up being included when building most .c files. percpu.h includes slab.h which in turn includes gfp.h making everything defined by the two files universally available and complicating inclusion dependencies. percpu.h -> slab.h dependency is about to be removed. Prepare for this change by updating users of gfp and slab facilities include those headers directly instead of assuming availability. As this conversion needs to touch large number of source files, the following script is used as the basis of conversion. http://userweb.kernel.org/~tj/misc/slabh-sweep.py The script does the followings. * Scan files for gfp and slab usages and update includes such that only the necessary includes are there. ie. if only gfp is used, gfp.h, if slab is used, slab.h. * When the script inserts a new include, it looks at the include blocks and try to put the new include such that its order conforms to its surrounding. It's put in the include block which contains core kernel includes, in the same order that the rest are ordered - alphabetical, Christmas tree, rev-Xmas-tree or at the end if there doesn't seem to be any matching order. * If the script can't find a place to put a new include (mostly because the file doesn't have fitting include block), it prints out an error message indicating which .h file needs to be added to the file. The conversion was done in the following steps. 1. The initial automatic conversion of all .c files updated slightly over 4000 files, deleting around 700 includes and adding ~480 gfp.h and ~3000 slab.h inclusions. The script emitted errors for ~400 files. 2. Each error was manually checked. Some didn't need the inclusion, some needed manual addition while adding it to implementation .h or embedding .c file was more appropriate for others. This step added inclusions to around 150 files. 3. The script was run again and the output was compared to the edits from #2 to make sure no file was left behind. 4. Several build tests were done and a couple of problems were fixed. e.g. lib/decompress_*.c used malloc/free() wrappers around slab APIs requiring slab.h to be added manually. 5. The script was run on all .h files but without automatically editing them as sprinkling gfp.h and slab.h inclusions around .h files could easily lead to inclusion dependency hell. Most gfp.h inclusion directives were ignored as stuff from gfp.h was usually wildly available and often used in preprocessor macros. Each slab.h inclusion directive was examined and added manually as necessary. 6. percpu.h was updated not to include slab.h. 7. Build test were done on the following configurations and failures were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my distributed build env didn't work with gcov compiles) and a few more options had to be turned off depending on archs to make things build (like ipr on powerpc/64 which failed due to missing writeq). * x86 and x86_64 UP and SMP allmodconfig and a custom test config. * powerpc and powerpc64 SMP allmodconfig * sparc and sparc64 SMP allmodconfig * ia64 SMP allmodconfig * s390 SMP allmodconfig * alpha SMP allmodconfig * um on x86_64 SMP allmodconfig 8. percpu.h modifications were reverted so that it could be applied as a separate patch and serve as bisection point. Given the fact that I had only a couple of failures from tests on step 6, I'm fairly confident about the coverage of this conversion patch. If there is a breakage, it's likely to be something in one of the arch headers which should be easily discoverable easily on most builds of the specific arch. Signed-off-by: Tejun Heo <tj@kernel.org> Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-24 16:04:11 +08:00
#include <linux/gfp.h>
static DEFINE_IDA(cb710_ida);
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 cb710_pci_configure(struct pci_dev *pdev)
{
unsigned int devfn = PCI_DEVFN(PCI_SLOT(pdev->devfn), 0);
struct pci_dev *pdev0;
u32 val;
cb710_pci_update_config_reg(pdev, 0x48,
~0x000000FF, 0x0000003F);
pci_read_config_dword(pdev, 0x48, &val);
if (val & 0x80000000)
return 0;
pdev0 = pci_get_slot(pdev->bus, devfn);
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 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);
devm_free_irq(&pdev->dev, pdev->irq, chip);
pci_save_state(pdev);
pci_disable_device(pdev);
if (state.event & PM_EVENT_SLEEP)
pci_set_power_state(pdev, PCI_D3hot);
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 cb710_probe(struct pci_dev *pdev,
const struct pci_device_id *ent)
{
struct cb710_chip *chip;
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, struct_size(chip, slot, n),
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;
spin_lock_init(&chip->irq_lock);
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;
err = ida_alloc(&cb710_ida, GFP_KERNEL);
if (err < 0)
return err;
chip->platform_id = 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 cb710_remove_one(struct pci_dev *pdev)
{
struct cb710_chip *chip = pci_get_drvdata(pdev);
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
ida_free(&cb710_ida, chip->platform_id);
}
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 = 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);