include/asm-ppc/ocp.h

   1 /*
   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>
  29 #include <linux/device.h>
  30 #include <linux/rwsem.h>
  31
  32 #include <asm/mmu.h>
  33 #include <asm/ocp_ids.h>
  34 #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
  49 extern struct list_head         ocp_devices;
  50 extern struct rw_semaphore      ocp_devices_sem;
  51
  52 struct 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  */
  89 struct 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 */
 102 struct 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
 114 struct 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) */
 120         int  (*suspend) (struct ocp_device *dev, pm_message_t state);   /* Device suspended */
 121         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  */
 132 static inline void *
 133 ocp_get_drvdata(struct ocp_device *pdev)
 134 {
 135         return pdev->drvdata;
 136 }
 137
 138 static inline void
 139 ocp_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  */
 149 static inline void
 150 ocp_force_power_off(struct ocp_device *odev)
 151 {
 152         mtdcr(DCRN_CPMFR, mfdcr(DCRN_CPMFR) | odev->def->pm);
 153 }
 154
 155 static inline void
 156 ocp_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 */
 166 extern int ocp_register_driver(struct ocp_driver *drv);
 167 extern void ocp_unregister_driver(struct ocp_driver *drv);
 168
 169 /* Build list of devices */
 170 extern int ocp_early_init(void) __init;
 171
 172 /* Find a device by index */
 173 extern struct ocp_device *ocp_find_device(unsigned int vendor, unsigned int function, int index);
 174
 175 /* Get a def by index */
 176 extern struct ocp_def *ocp_get_one_device(unsigned int vendor, unsigned int function, int index);
 177
 178 /* Add a device by index */
 179 extern int ocp_add_one_device(struct ocp_def *def);
 180
 181 /* Remove a device by index */
 182 extern int ocp_remove_one_device(unsigned int vendor, unsigned int function, int index);
 183
 184 /* Iterate over devices and execute a routine */
 185 extern 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)                      \
 189 static ssize_t                                                          \
 190 show_##name##_##field(struct device *dev, struct device_attribute *attr, char *buf)                     \
 191 {                                                                       \
 192         struct ocp_device *odev = to_ocp_dev(dev);                      \
 193         type *add = odev->def->additions;                               \
 194                                                                         \
 195         return sprintf(buf, format, add->field);                        \
 196 }                                                                       \
 197 static 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
 203 #endif                          /* CONFIG_PPC_OCP */
 204 #endif                          /* __OCP_H__ */
 205 #endif                          /* __KERNEL__ */