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