206 lines
6.8 KiB
C
206 lines
6.8 KiB
C
/*
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* ocp.h
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*
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* (c) Benjamin Herrenschmidt (benh@kernel.crashing.org)
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* Mipsys - France
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*
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* Derived from work (c) Armin Kuster akuster@pacbell.net
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*
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* Additional support and port to 2.6 LDM/sysfs by
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* Matt Porter <mporter@kernel.crashing.org>
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* Copyright 2003-2004 MontaVista Software, Inc.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* TODO: - Add get/put interface & fixup locking to provide same API for
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* 2.4 and 2.5
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* - Rework PM callbacks
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*/
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#ifdef __KERNEL__
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#ifndef __OCP_H__
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#define __OCP_H__
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#include <linux/init.h>
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#include <linux/list.h>
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#include <linux/devfs_fs_kernel.h>
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#include <linux/device.h>
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#include <asm/mmu.h>
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#include <asm/ocp_ids.h>
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#include <asm/rwsem.h>
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#include <asm/semaphore.h>
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#ifdef CONFIG_PPC_OCP
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#define OCP_MAX_IRQS 7
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#define MAX_EMACS 4
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#define OCP_IRQ_NA -1 /* used when ocp device does not have an irq */
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#define OCP_IRQ_MUL -2 /* used for ocp devices with multiply irqs */
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#define OCP_NULL_TYPE -1 /* used to mark end of list */
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#define OCP_CPM_NA 0 /* No Clock or Power Management avaliable */
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#define OCP_PADDR_NA 0 /* No MMIO registers */
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#define OCP_ANY_ID (~0)
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#define OCP_ANY_INDEX -1
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extern struct list_head ocp_devices;
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extern struct rw_semaphore ocp_devices_sem;
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struct ocp_device_id {
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unsigned int vendor, function; /* Vendor and function ID or OCP_ANY_ID */
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unsigned long driver_data; /* Data private to the driver */
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};
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/*
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* Static definition of an OCP device.
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*
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* @vendor: Vendor code. It is _STRONGLY_ discouraged to use
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* the vendor code as a way to match a unique device,
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* though I kept that possibility open, you should
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* really define different function codes for different
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* device types
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* @function: This is the function code for this device.
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* @index: This index is used for mapping the Nth function of a
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* given core. This is typically used for cross-driver
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* matching, like looking for a given MAL or ZMII from
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* an EMAC or for getting to the proper set of DCRs.
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* Indices are no longer magically calculated based on
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* structure ordering, they have to be actually coded
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* into the ocp_def to avoid any possible confusion
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* I _STRONGLY_ (again ? wow !) encourage anybody relying
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* on index mapping to encode the "target" index in an
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* associated structure pointed to by "additions", see
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* how it's done for the EMAC driver.
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* @paddr: Device physical address (may not mean anything...)
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* @irq: Interrupt line for this device (TODO: think about making
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* an array with this)
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* @pm: Currently, contains the bitmask in CPMFR DCR for the device
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* @additions: Optionally points to a function specific structure
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* providing additional informations for a given device
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* instance. It's currently used by the EMAC driver for MAL
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* channel & ZMII port mapping among others.
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* @show: Optionally points to a function specific structure
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* providing a sysfs show routine for additions fields.
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*/
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struct ocp_def {
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unsigned int vendor;
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unsigned int function;
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int index;
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phys_addr_t paddr;
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int irq;
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unsigned long pm;
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void *additions;
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void (*show)(struct device *);
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};
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/* Struct for a given device instance */
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struct ocp_device {
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struct list_head link;
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char name[80]; /* device name */
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struct ocp_def *def; /* device definition */
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void *drvdata; /* driver data for this device */
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struct ocp_driver *driver;
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u32 current_state; /* Current operating state. In ACPI-speak,
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this is D0-D3, D0 being fully functional,
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and D3 being off. */
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struct device dev;
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};
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struct ocp_driver {
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struct list_head node;
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char *name;
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const struct ocp_device_id *id_table; /* NULL if wants all devices */
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int (*probe) (struct ocp_device *dev); /* New device inserted */
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void (*remove) (struct ocp_device *dev); /* Device removed (NULL if not a hot-plug capable driver) */
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int (*suspend) (struct ocp_device *dev, pm_message_t state); /* Device suspended */
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int (*resume) (struct ocp_device *dev); /* Device woken up */
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struct device_driver driver;
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};
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#define to_ocp_dev(n) container_of(n, struct ocp_device, dev)
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#define to_ocp_drv(n) container_of(n, struct ocp_driver, driver)
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/* Similar to the helpers above, these manipulate per-ocp_dev
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* driver-specific data. Currently stored as ocp_dev::ocpdev,
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* a void pointer, but it is not present on older kernels.
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*/
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static inline void *
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ocp_get_drvdata(struct ocp_device *pdev)
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{
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return pdev->drvdata;
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}
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static inline void
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ocp_set_drvdata(struct ocp_device *pdev, void *data)
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{
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pdev->drvdata = data;
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}
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#if defined (CONFIG_PM)
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/*
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* This is right for the IBM 405 and 440 but will need to be
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* generalized if the OCP stuff gets used on other processors.
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*/
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static inline void
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ocp_force_power_off(struct ocp_device *odev)
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{
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mtdcr(DCRN_CPMFR, mfdcr(DCRN_CPMFR) | odev->def->pm);
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}
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static inline void
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ocp_force_power_on(struct ocp_device *odev)
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{
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mtdcr(DCRN_CPMFR, mfdcr(DCRN_CPMFR) & ~odev->def->pm);
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}
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#else
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#define ocp_force_power_off(x) (void)(x)
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#define ocp_force_power_on(x) (void)(x)
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#endif
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/* Register/Unregister an OCP driver */
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extern int ocp_register_driver(struct ocp_driver *drv);
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extern void ocp_unregister_driver(struct ocp_driver *drv);
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/* Build list of devices */
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extern int ocp_early_init(void) __init;
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/* Find a device by index */
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extern struct ocp_device *ocp_find_device(unsigned int vendor, unsigned int function, int index);
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/* Get a def by index */
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extern struct ocp_def *ocp_get_one_device(unsigned int vendor, unsigned int function, int index);
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/* Add a device by index */
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extern int ocp_add_one_device(struct ocp_def *def);
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/* Remove a device by index */
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extern int ocp_remove_one_device(unsigned int vendor, unsigned int function, int index);
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/* Iterate over devices and execute a routine */
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extern void ocp_for_each_device(void(*callback)(struct ocp_device *, void *arg), void *arg);
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/* Sysfs support */
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#define OCP_SYSFS_ADDTL(type, format, name, field) \
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static ssize_t \
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show_##name##_##field(struct device *dev, struct device_attribute *attr, char *buf) \
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{ \
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struct ocp_device *odev = to_ocp_dev(dev); \
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type *add = odev->def->additions; \
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\
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return sprintf(buf, format, add->field); \
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} \
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static DEVICE_ATTR(name##_##field, S_IRUGO, show_##name##_##field, NULL);
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#ifdef CONFIG_IBM_OCP
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#include <asm/ibm_ocp.h>
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#endif
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#endif /* CONFIG_PPC_OCP */
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#endif /* __OCP_H__ */
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#endif /* __KERNEL__ */
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