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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * ocp.h
3 *
4 * (c) Benjamin Herrenschmidt (benh@kernel.crashing.org)
5 * Mipsys - France
6 *
7 * Derived from work (c) Armin Kuster akuster@pacbell.net
8 *
9 * Additional support and port to 2.6 LDM/sysfs by
10 * Matt Porter <mporter@kernel.crashing.org>
11 * Copyright 2003-2004 MontaVista Software, Inc.
12 *
13 * This program is free software; you can redistribute it and/or modify it
14 * under the terms of the GNU General Public License as published by the
15 * Free Software Foundation; either version 2 of the License, or (at your
16 * option) any later version.
17 *
18 * TODO: - Add get/put interface & fixup locking to provide same API for
19 * 2.4 and 2.5
20 * - Rework PM callbacks
21 */
22
23#ifdef __KERNEL__
24#ifndef __OCP_H__
25#define __OCP_H__
26
27#include <linux/init.h>
28#include <linux/list.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070029#include <linux/device.h>
Robert P. J. Day20b31b52007-07-18 23:36:36 +100030#include <linux/rwsem.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070031
32#include <asm/mmu.h>
33#include <asm/ocp_ids.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070034#include <asm/semaphore.h>
35
36#ifdef CONFIG_PPC_OCP
37
38#define OCP_MAX_IRQS 7
39#define MAX_EMACS 4
40#define OCP_IRQ_NA -1 /* used when ocp device does not have an irq */
41#define OCP_IRQ_MUL -2 /* used for ocp devices with multiply irqs */
42#define OCP_NULL_TYPE -1 /* used to mark end of list */
43#define OCP_CPM_NA 0 /* No Clock or Power Management avaliable */
44#define OCP_PADDR_NA 0 /* No MMIO registers */
45
46#define OCP_ANY_ID (~0)
47#define OCP_ANY_INDEX -1
48
49extern struct list_head ocp_devices;
50extern struct rw_semaphore ocp_devices_sem;
51
52struct ocp_device_id {
53 unsigned int vendor, function; /* Vendor and function ID or OCP_ANY_ID */
54 unsigned long driver_data; /* Data private to the driver */
55};
56
57
58/*
59 * Static definition of an OCP device.
60 *
61 * @vendor: Vendor code. It is _STRONGLY_ discouraged to use
62 * the vendor code as a way to match a unique device,
63 * though I kept that possibility open, you should
64 * really define different function codes for different
65 * device types
66 * @function: This is the function code for this device.
67 * @index: This index is used for mapping the Nth function of a
68 * given core. This is typically used for cross-driver
69 * matching, like looking for a given MAL or ZMII from
70 * an EMAC or for getting to the proper set of DCRs.
71 * Indices are no longer magically calculated based on
72 * structure ordering, they have to be actually coded
73 * into the ocp_def to avoid any possible confusion
74 * I _STRONGLY_ (again ? wow !) encourage anybody relying
75 * on index mapping to encode the "target" index in an
76 * associated structure pointed to by "additions", see
77 * how it's done for the EMAC driver.
78 * @paddr: Device physical address (may not mean anything...)
79 * @irq: Interrupt line for this device (TODO: think about making
80 * an array with this)
81 * @pm: Currently, contains the bitmask in CPMFR DCR for the device
82 * @additions: Optionally points to a function specific structure
83 * providing additional informations for a given device
84 * instance. It's currently used by the EMAC driver for MAL
85 * channel & ZMII port mapping among others.
86 * @show: Optionally points to a function specific structure
87 * providing a sysfs show routine for additions fields.
88 */
89struct ocp_def {
90 unsigned int vendor;
91 unsigned int function;
92 int index;
93 phys_addr_t paddr;
94 int irq;
95 unsigned long pm;
96 void *additions;
97 void (*show)(struct device *);
98};
99
100
101/* Struct for a given device instance */
102struct ocp_device {
103 struct list_head link;
104 char name[80]; /* device name */
105 struct ocp_def *def; /* device definition */
106 void *drvdata; /* driver data for this device */
107 struct ocp_driver *driver;
108 u32 current_state; /* Current operating state. In ACPI-speak,
109 this is D0-D3, D0 being fully functional,
110 and D3 being off. */
111 struct device dev;
112};
113
114struct ocp_driver {
115 struct list_head node;
116 char *name;
117 const struct ocp_device_id *id_table; /* NULL if wants all devices */
118 int (*probe) (struct ocp_device *dev); /* New device inserted */
119 void (*remove) (struct ocp_device *dev); /* Device removed (NULL if not a hot-plug capable driver) */
Pavel Machekb1c42852005-04-16 15:25:34 -0700120 int (*suspend) (struct ocp_device *dev, pm_message_t state); /* Device suspended */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121 int (*resume) (struct ocp_device *dev); /* Device woken up */
122 struct device_driver driver;
123};
124
125#define to_ocp_dev(n) container_of(n, struct ocp_device, dev)
126#define to_ocp_drv(n) container_of(n, struct ocp_driver, driver)
127
128/* Similar to the helpers above, these manipulate per-ocp_dev
129 * driver-specific data. Currently stored as ocp_dev::ocpdev,
130 * a void pointer, but it is not present on older kernels.
131 */
132static inline void *
133ocp_get_drvdata(struct ocp_device *pdev)
134{
135 return pdev->drvdata;
136}
137
138static inline void
139ocp_set_drvdata(struct ocp_device *pdev, void *data)
140{
141 pdev->drvdata = data;
142}
143
144#if defined (CONFIG_PM)
145/*
146 * This is right for the IBM 405 and 440 but will need to be
147 * generalized if the OCP stuff gets used on other processors.
148 */
149static inline void
150ocp_force_power_off(struct ocp_device *odev)
151{
152 mtdcr(DCRN_CPMFR, mfdcr(DCRN_CPMFR) | odev->def->pm);
153}
154
155static inline void
156ocp_force_power_on(struct ocp_device *odev)
157{
158 mtdcr(DCRN_CPMFR, mfdcr(DCRN_CPMFR) & ~odev->def->pm);
159}
160#else
161#define ocp_force_power_off(x) (void)(x)
162#define ocp_force_power_on(x) (void)(x)
163#endif
164
165/* Register/Unregister an OCP driver */
166extern int ocp_register_driver(struct ocp_driver *drv);
167extern void ocp_unregister_driver(struct ocp_driver *drv);
168
169/* Build list of devices */
170extern int ocp_early_init(void) __init;
171
172/* Find a device by index */
173extern struct ocp_device *ocp_find_device(unsigned int vendor, unsigned int function, int index);
174
175/* Get a def by index */
176extern struct ocp_def *ocp_get_one_device(unsigned int vendor, unsigned int function, int index);
177
178/* Add a device by index */
179extern int ocp_add_one_device(struct ocp_def *def);
180
181/* Remove a device by index */
182extern int ocp_remove_one_device(unsigned int vendor, unsigned int function, int index);
183
184/* Iterate over devices and execute a routine */
185extern void ocp_for_each_device(void(*callback)(struct ocp_device *, void *arg), void *arg);
186
187/* Sysfs support */
188#define OCP_SYSFS_ADDTL(type, format, name, field) \
189static ssize_t \
Yani Ioannouf2d03e12005-05-17 06:44:59 -0400190show_##name##_##field(struct device *dev, struct device_attribute *attr, char *buf) \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191{ \
192 struct ocp_device *odev = to_ocp_dev(dev); \
193 type *add = odev->def->additions; \
194 \
195 return sprintf(buf, format, add->field); \
196} \
197static DEVICE_ATTR(name##_##field, S_IRUGO, show_##name##_##field, NULL);
198
199#ifdef CONFIG_IBM_OCP
200#include <asm/ibm_ocp.h>
201#endif
202
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203#endif /* CONFIG_PPC_OCP */
204#endif /* __OCP_H__ */
205#endif /* __KERNEL__ */