2 * linux/drivers/char/hpilo.h
4 * Copyright (C) 2008 Hewlett-Packard Development Company, L.P.
5 * David Altobelli <david.altobelli@hp.com>
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.
14 #define ILO_NAME "hpilo"
16 /* max number of open channel control blocks per device, hw limited to 32 */
18 /* min number of open channel control blocks per device, hw limited to 32 */
20 /* max number of supported devices */
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 */
28 /* spin counter for open/close delay */
29 #define MAX_WAIT (MAX_WAIT_TIME / WAIT_TIME)
32 * Per device, used to track global memory allocations.
35 /* mmio registers on device */
36 char __iomem *mmio_vaddr;
38 /* doorbell registers on device */
39 char __iomem *db_vaddr;
41 /* shared memory on device used for channel control blocks */
42 char __iomem *ram_vaddr;
44 /* files corresponding to this device */
45 struct ccb_data *ccb_alloc[MAX_CCB];
47 struct pci_dev *ilo_dev;
50 * open_lock serializes ccb_cnt during open and close
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
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
61 spinlock_t alloc_lock;
67 /* offset from mmio_vaddr for enabling doorbell interrupts */
69 /* offset from mmio_vaddr for outbound communications */
71 /* DB_OUT reset bit */
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.
79 #define ILOSW_CCB_SZ 64
80 #define ILOHW_CCB_SZ 128
103 char __iomem *db_base;
109 /* unused context area (64 bytes) */
112 /* ccb queue parameters */
116 #define L2_QENTRY_SZ 12
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
125 /* ccb doorbell macros */
126 #define L2_DB_SIZE 14
127 #define ONE_DB_SIZE (1 << L2_DB_SIZE)
130 * Per fd structure used to track the ccb allocated to that dev file.
133 /* software version of ccb, using virtual addrs */
134 struct ccb driver_ccb;
136 /* hardware version of ccb, using physical addrs */
139 /* hardware ccb is written to this shared mapped device memory */
140 struct ccb __iomem *mapped_ccb;
142 /* dma'able memory used for send/recv queues */
147 /* pointer to hardware device info */
148 struct ilo_hwinfo *ilo_hw;
150 /* queue for this ccb to wait for recv data */
151 wait_queue_head_t ccb_waitq;
153 /* usage count, to allow for shared ccb's */
156 /* open wanted exclusive access to this ccb */
161 * FIFO queue structure, shared with hw.
163 #define ILO_START_ALIGN 4096
164 #define ILO_CACHE_SZ 128
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)];
173 u8 pad_1[ILO_CACHE_SZ - (sizeof(u64))];
176 u8 pad_2[ILO_CACHE_SZ - (sizeof(u64))];
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))
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
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)
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)
212 #define ENTRY_MASK_NOSTATE (ENTRY_MASK >> (ENTRY_BITS_C + ENTRY_BITS_O))
214 #endif /* __HPILO_H */