forked from mirrors/linux
d69d804845
In the match() callback, the struct device_driver * should not be changed, so change the function callback to be a const *. This is one step of many towards making the driver core safe to have struct device_driver in read-only memory. Because the match() callback is in all busses, all busses are modified to handle this properly. This does entail switching some container_of() calls to container_of_const() to properly handle the constant *. For some busses, like PCI and USB and HV, the const * is cast away in the match callback as those busses do want to modify those structures at this point in time (they have a local lock in the driver structure.) That will have to be changed in the future if they wish to have their struct device * in read-only-memory. Cc: Rafael J. Wysocki <rafael@kernel.org> Reviewed-by: Alex Elder <elder@kernel.org> Acked-by: Sumit Garg <sumit.garg@linaro.org> Link: https://lore.kernel.org/r/2024070136-wrongdoer-busily-01e8@gregkh Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
112 lines
3 KiB
C
112 lines
3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_EISA_H
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#define _LINUX_EISA_H
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#include <linux/ioport.h>
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#include <linux/device.h>
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#include <linux/mod_devicetable.h>
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#define EISA_MAX_SLOTS 8
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#define EISA_MAX_RESOURCES 4
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/* A few EISA constants/offsets... */
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#define EISA_DMA1_STATUS 8
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#define EISA_INT1_CTRL 0x20
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#define EISA_INT1_MASK 0x21
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#define EISA_INT2_CTRL 0xA0
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#define EISA_INT2_MASK 0xA1
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#define EISA_DMA2_STATUS 0xD0
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#define EISA_DMA2_WRITE_SINGLE 0xD4
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#define EISA_EXT_NMI_RESET_CTRL 0x461
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#define EISA_INT1_EDGE_LEVEL 0x4D0
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#define EISA_INT2_EDGE_LEVEL 0x4D1
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#define EISA_VENDOR_ID_OFFSET 0xC80
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#define EISA_CONFIG_OFFSET 0xC84
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#define EISA_CONFIG_ENABLED 1
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#define EISA_CONFIG_FORCED 2
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/* There is not much we can say about an EISA device, apart from
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* signature, slot number, and base address. dma_mask is set by
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* default to parent device mask..*/
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struct eisa_device {
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struct eisa_device_id id;
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int slot;
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int state;
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unsigned long base_addr;
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struct resource res[EISA_MAX_RESOURCES];
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u64 dma_mask;
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struct device dev; /* generic device */
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#ifdef CONFIG_EISA_NAMES
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char pretty_name[50];
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#endif
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};
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#define to_eisa_device(n) container_of(n, struct eisa_device, dev)
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static inline int eisa_get_region_index (void *addr)
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{
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unsigned long x = (unsigned long) addr;
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x &= 0xc00;
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return (x >> 12);
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}
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struct eisa_driver {
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const struct eisa_device_id *id_table;
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struct device_driver driver;
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};
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#define to_eisa_driver(drv) container_of_const(drv,struct eisa_driver, driver)
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/* These external functions are only available when EISA support is enabled. */
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#ifdef CONFIG_EISA
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extern struct bus_type eisa_bus_type;
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int eisa_driver_register (struct eisa_driver *edrv);
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void eisa_driver_unregister (struct eisa_driver *edrv);
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#else /* !CONFIG_EISA */
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static inline int eisa_driver_register (struct eisa_driver *edrv) { return 0; }
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static inline void eisa_driver_unregister (struct eisa_driver *edrv) { }
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#endif /* !CONFIG_EISA */
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/* Mimics pci.h... */
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static inline void *eisa_get_drvdata (struct eisa_device *edev)
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{
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return dev_get_drvdata(&edev->dev);
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}
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static inline void eisa_set_drvdata (struct eisa_device *edev, void *data)
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{
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dev_set_drvdata(&edev->dev, data);
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}
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/* The EISA root device. There's rumours about machines with multiple
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* busses (PA-RISC ?), so we try to handle that. */
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struct eisa_root_device {
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struct device *dev; /* Pointer to bridge device */
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struct resource *res;
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unsigned long bus_base_addr;
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int slots; /* Max slot number */
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int force_probe; /* Probe even when no slot 0 */
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u64 dma_mask; /* from bridge device */
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int bus_nr; /* Set by eisa_root_register */
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struct resource eisa_root_res; /* ditto */
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};
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int eisa_root_register (struct eisa_root_device *root);
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#ifdef CONFIG_EISA
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extern int EISA_bus;
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#else
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# define EISA_bus 0
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#endif
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#endif
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