drivers/misc/hpilo.h

   1 /*
   2  * linux/drivers/char/hpilo.h
   3  *
   4  * Copyright (C) 2008 Hewlett-Packard Development Company, L.P.
   5  *      David Altobelli <david.altobelli@hp.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  */
  11 #ifndef __HPILO_H
  12 #define __HPILO_H
  13
  14 #define ILO_NAME "hpilo"
  15
  16 /* max number of open channel control blocks per device, hw limited to 32 */
  17 #define MAX_CCB        24
  18 /* min number of open channel control blocks per device, hw limited to 32 */
  19 #define MIN_CCB         8
  20 /* max number of supported devices */
  21 #define MAX_ILO_DEV     1
  22 /* max number of files */
  23 #define MAX_OPEN        (MAX_CCB * MAX_ILO_DEV)
  24 /* total wait time in usec */
  25 #define MAX_WAIT_TIME   10000
  26 /* per spin wait time in usec */
  27 #define WAIT_TIME       10
  28 /* spin counter for open/close delay */
  29 #define MAX_WAIT        (MAX_WAIT_TIME / WAIT_TIME)
  30
  31 /*
  32  * Per device, used to track global memory allocations.
  33  */
  34 struct ilo_hwinfo {
  35         /* mmio registers on device */
  36         char __iomem *mmio_vaddr;
  37
  38         /* doorbell registers on device */
  39         char __iomem *db_vaddr;
  40
  41         /* shared memory on device used for channel control blocks */
  42         char __iomem *ram_vaddr;
  43
  44         /* files corresponding to this device */
  45         struct ccb_data *ccb_alloc[MAX_CCB];
  46
  47         struct pci_dev *ilo_dev;
  48
  49         /*
  50          * open_lock      serializes ccb_cnt during open and close
  51          * [ irq disabled ]
  52          * -> alloc_lock  used when adding/removing/searching ccb_alloc,
  53          *                which represents all ccbs open on the device
  54          * --> fifo_lock  controls access to fifo queues shared with hw
  55          *
  56          * Locks must be taken in this order, but open_lock and alloc_lock
  57          * are optional, they do not need to be held in order to take a
  58          * lower level lock.
  59          */
  60         spinlock_t open_lock;
  61         spinlock_t alloc_lock;
  62         spinlock_t fifo_lock;
  63
  64         struct cdev cdev;
  65 };
  66
  67 /* offset from mmio_vaddr for enabling doorbell interrupts */
  68 #define DB_IRQ          0xB2
  69 /* offset from mmio_vaddr for outbound communications */
  70 #define DB_OUT          0xD4
  71 /* DB_OUT reset bit */
  72 #define DB_RESET        26
  73
  74 /*
  75  * Channel control block. Used to manage hardware queues.
  76  * The format must match hw's version.  The hw ccb is 128 bytes,
  77  * but the context area shouldn't be touched by the driver.
  78  */
  79 #define ILOSW_CCB_SZ    64
  80 #define ILOHW_CCB_SZ    128
  81 struct ccb {
  82         union {
  83                 char *send_fifobar;
  84                 u64 send_fifobar_pa;
  85         } ccb_u1;
  86         union {
  87                 char *send_desc;
  88                 u64 send_desc_pa;
  89         } ccb_u2;
  90         u64 send_ctrl;
  91
  92         union {
  93                 char *recv_fifobar;
  94                 u64 recv_fifobar_pa;
  95         } ccb_u3;
  96         union {
  97                 char *recv_desc;
  98                 u64 recv_desc_pa;
  99         } ccb_u4;
 100         u64 recv_ctrl;
 101
 102         union {
 103                 char __iomem *db_base;
 104                 u64 padding5;
 105         } ccb_u5;
 106
 107         u64 channel;
 108
 109         /* unused context area (64 bytes) */
 110 };
 111
 112 /* ccb queue parameters */
 113 #define SENDQ           1
 114 #define RECVQ           2
 115 #define NR_QENTRY       4
 116 #define L2_QENTRY_SZ    12
 117
 118 /* ccb ctrl bitfields */
 119 #define CTRL_BITPOS_L2SZ             0
 120 #define CTRL_BITPOS_FIFOINDEXMASK    4
 121 #define CTRL_BITPOS_DESCLIMIT        18
 122 #define CTRL_BITPOS_A                30
 123 #define CTRL_BITPOS_G                31
 124
 125 /* ccb doorbell macros */
 126 #define L2_DB_SIZE              14
 127 #define ONE_DB_SIZE             (1 << L2_DB_SIZE)
 128
 129 /*
 130  * Per fd structure used to track the ccb allocated to that dev file.
 131  */
 132 struct ccb_data {
 133         /* software version of ccb, using virtual addrs */
 134         struct ccb  driver_ccb;
 135
 136         /* hardware version of ccb, using physical addrs */
 137         struct ccb  ilo_ccb;
 138
 139         /* hardware ccb is written to this shared mapped device memory */
 140         struct ccb __iomem *mapped_ccb;
 141
 142         /* dma'able memory used for send/recv queues */
 143         void       *dma_va;
 144         dma_addr_t  dma_pa;
 145         size_t      dma_size;
 146
 147         /* pointer to hardware device info */
 148         struct ilo_hwinfo *ilo_hw;
 149
 150         /* queue for this ccb to wait for recv data */
 151         wait_queue_head_t ccb_waitq;
 152
 153         /* usage count, to allow for shared ccb's */
 154         int         ccb_cnt;
 155
 156         /* open wanted exclusive access to this ccb */
 157         int         ccb_excl;
 158 };
 159
 160 /*
 161  * FIFO queue structure, shared with hw.
 162  */
 163 #define ILO_START_ALIGN 4096
 164 #define ILO_CACHE_SZ     128
 165 struct fifo {
 166     u64 nrents; /* user requested number of fifo entries */
 167     u64 imask;  /* mask to extract valid fifo index */
 168     u64 merge;  /*  O/C bits to merge in during enqueue operation */
 169     u64 reset;  /* set to non-zero when the target device resets */
 170     u8  pad_0[ILO_CACHE_SZ - (sizeof(u64) * 4)];
 171
 172     u64 head;
 173     u8  pad_1[ILO_CACHE_SZ - (sizeof(u64))];
 174
 175     u64 tail;
 176     u8  pad_2[ILO_CACHE_SZ - (sizeof(u64))];
 177
 178     u64 fifobar[1];
 179 };
 180
 181 /* convert between struct fifo, and the fifobar, which is saved in the ccb */
 182 #define FIFOHANDLESIZE (sizeof(struct fifo) - sizeof(u64))
 183 #define FIFOBARTOHANDLE(_fifo) \
 184         ((struct fifo *)(((char *)(_fifo)) - FIFOHANDLESIZE))
 185
 186 /* the number of qwords to consume from the entry descriptor */
 187 #define ENTRY_BITPOS_QWORDS      0
 188 /* descriptor index number (within a specified queue) */
 189 #define ENTRY_BITPOS_DESCRIPTOR  10
 190 /* state bit, fifo entry consumed by consumer */
 191 #define ENTRY_BITPOS_C           22
 192 /* state bit, fifo entry is occupied */
 193 #define ENTRY_BITPOS_O           23
 194
 195 #define ENTRY_BITS_QWORDS        10
 196 #define ENTRY_BITS_DESCRIPTOR    12
 197 #define ENTRY_BITS_C             1
 198 #define ENTRY_BITS_O             1
 199 #define ENTRY_BITS_TOTAL        \
 200         (ENTRY_BITS_C + ENTRY_BITS_O + \
 201          ENTRY_BITS_QWORDS + ENTRY_BITS_DESCRIPTOR)
 202
 203 /* extract various entry fields */
 204 #define ENTRY_MASK ((1 << ENTRY_BITS_TOTAL) - 1)
 205 #define ENTRY_MASK_C (((1 << ENTRY_BITS_C) - 1) << ENTRY_BITPOS_C)
 206 #define ENTRY_MASK_O (((1 << ENTRY_BITS_O) - 1) << ENTRY_BITPOS_O)
 207 #define ENTRY_MASK_QWORDS \
 208         (((1 << ENTRY_BITS_QWORDS) - 1) << ENTRY_BITPOS_QWORDS)
 209 #define ENTRY_MASK_DESCRIPTOR \
 210         (((1 << ENTRY_BITS_DESCRIPTOR) - 1) << ENTRY_BITPOS_DESCRIPTOR)
 211
 212 #define ENTRY_MASK_NOSTATE (ENTRY_MASK >> (ENTRY_BITS_C + ENTRY_BITS_O))
 213
 214 #endif /* __HPILO_H */