drivers/dma/intel_mid_dma_regs.h

   1 /*
   2  *  intel_mid_dma_regs.h - Intel MID DMA Drivers
   3  *
   4  *  Copyright (C) 2008-10 Intel Corp
   5  *  Author: Vinod Koul <vinod.koul@intel.com>
   6  *  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   7  *
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU General Public License as published by
  10  *  the Free Software Foundation; version 2 of the License.
  11  *
  12  *  This program is distributed in the hope that it will be useful, but
  13  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  *  General Public License for more details.
  16  *
  17  *  You should have received a copy of the GNU General Public License along
  18  *  with this program; if not, write to the Free Software Foundation, Inc.,
  19  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  20  *
  21  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  22  *
  23  *
  24  */
  25 #ifndef __INTEL_MID_DMAC_REGS_H__
  26 #define __INTEL_MID_DMAC_REGS_H__
  27
  28 #include <linux/dmaengine.h>
  29 #include <linux/dmapool.h>
  30 #include <linux/pci_ids.h>
  31
  32 #define INTEL_MID_DMA_DRIVER_VERSION "1.1.0"
  33
  34 #define REG_BIT0                0x00000001
  35 #define REG_BIT8                0x00000100
  36 #define INT_MASK_WE             0x8
  37 #define CLEAR_DONE              0xFFFFEFFF
  38 #define UNMASK_INTR_REG(chan_num) \
  39         ((REG_BIT0 << chan_num) | (REG_BIT8 << chan_num))
  40 #define MASK_INTR_REG(chan_num) (REG_BIT8 << chan_num)
  41
  42 #define ENABLE_CHANNEL(chan_num) \
  43         ((REG_BIT0 << chan_num) | (REG_BIT8 << chan_num))
  44
  45 #define DISABLE_CHANNEL(chan_num) \
  46         (REG_BIT8 << chan_num)
  47
  48 #define DESCS_PER_CHANNEL       16
  49 /*DMA Registers*/
  50 /*registers associated with channel programming*/
  51 #define DMA_REG_SIZE            0x400
  52 #define DMA_CH_SIZE             0x58
  53
  54 /*CH X REG = (DMA_CH_SIZE)*CH_NO + REG*/
  55 #define SAR                     0x00 /* Source Address Register*/
  56 #define DAR                     0x08 /* Destination Address Register*/
  57 #define LLP                     0x10 /* Linked List Pointer Register*/
  58 #define CTL_LOW                 0x18 /* Control Register*/
  59 #define CTL_HIGH                0x1C /* Control Register*/
  60 #define CFG_LOW                 0x40 /* Configuration Register Low*/
  61 #define CFG_HIGH                0x44 /* Configuration Register high*/
  62
  63 #define STATUS_TFR              0x2E8
  64 #define STATUS_BLOCK            0x2F0
  65 #define STATUS_ERR              0x308
  66
  67 #define RAW_TFR                 0x2C0
  68 #define RAW_BLOCK               0x2C8
  69 #define RAW_ERR                 0x2E0
  70
  71 #define MASK_TFR                0x310
  72 #define MASK_BLOCK              0x318
  73 #define MASK_SRC_TRAN           0x320
  74 #define MASK_DST_TRAN           0x328
  75 #define MASK_ERR                0x330
  76
  77 #define CLEAR_TFR               0x338
  78 #define CLEAR_BLOCK             0x340
  79 #define CLEAR_SRC_TRAN          0x348
  80 #define CLEAR_DST_TRAN          0x350
  81 #define CLEAR_ERR               0x358
  82
  83 #define INTR_STATUS             0x360
  84 #define DMA_CFG                 0x398
  85 #define DMA_CHAN_EN             0x3A0
  86
  87 /*DMA channel control registers*/
  88 union intel_mid_dma_ctl_lo {
  89         struct {
  90                 u32     int_en:1;       /*enable or disable interrupts*/
  91                                         /*should be 0*/
  92                 u32     dst_tr_width:3; /*destination transfer width*/
  93                                         /*usually 32 bits = 010*/
  94                 u32     src_tr_width:3; /*source transfer width*/
  95                                         /*usually 32 bits = 010*/
  96                 u32     dinc:2;         /*destination address inc/dec*/
  97                                         /*For mem:INC=00, Periphral NoINC=11*/
  98                 u32     sinc:2;         /*source address inc or dec, as above*/
  99                 u32     dst_msize:3;    /*destination burst transaction length*/
 100                                         /*always = 16 ie 011*/
 101                 u32     src_msize:3;    /*source burst transaction length*/
 102                                         /*always = 16 ie 011*/
 103                 u32     reser1:3;
 104                 u32     tt_fc:3;        /*transfer type and flow controller*/
 105                                         /*M-M = 000
 106                                           P-M = 010
 107                                           M-P = 001*/
 108                 u32     dms:2;          /*destination master select = 0*/
 109                 u32     sms:2;          /*source master select = 0*/
 110                 u32     llp_dst_en:1;   /*enable/disable destination LLP = 0*/
 111                 u32     llp_src_en:1;   /*enable/disable source LLP = 0*/
 112                 u32     reser2:3;
 113         } ctlx;
 114         u32     ctl_lo;
 115 };
 116
 117 union intel_mid_dma_ctl_hi {
 118         struct {
 119                 u32     block_ts:12;    /*block transfer size*/
 120                 u32     done:1;         /*Done - updated by DMAC*/
 121                 u32     reser:19;       /*configured by DMAC*/
 122         } ctlx;
 123         u32     ctl_hi;
 124
 125 };
 126
 127 /*DMA channel configuration registers*/
 128 union intel_mid_dma_cfg_lo {
 129         struct {
 130                 u32     reser1:5;
 131                 u32     ch_prior:3;     /*channel priority = 0*/
 132                 u32     ch_susp:1;      /*channel suspend = 0*/
 133                 u32     fifo_empty:1;   /*FIFO empty or not R bit = 0*/
 134                 u32     hs_sel_dst:1;   /*select HW/SW destn handshaking*/
 135                                         /*HW = 0, SW = 1*/
 136                 u32     hs_sel_src:1;   /*select HW/SW src handshaking*/
 137                 u32     reser2:6;
 138                 u32     dst_hs_pol:1;   /*dest HS interface polarity*/
 139                 u32     src_hs_pol:1;   /*src HS interface polarity*/
 140                 u32     max_abrst:10;   /*max AMBA burst len = 0 (no sw limit*/
 141                 u32     reload_src:1;   /*auto reload src addr =1 if src is P*/
 142                 u32     reload_dst:1;   /*AR destn addr =1 if dstn is P*/
 143         } cfgx;
 144         u32     cfg_lo;
 145 };
 146
 147 union intel_mid_dma_cfg_hi {
 148         struct {
 149                 u32     fcmode:1;       /*flow control mode = 1*/
 150                 u32     fifo_mode:1;    /*FIFO mode select = 1*/
 151                 u32     protctl:3;      /*protection control = 0*/
 152                 u32     rsvd:2;
 153                 u32     src_per:4;      /*src hw HS interface*/
 154                 u32     dst_per:4;      /*dstn hw HS interface*/
 155                 u32     reser2:17;
 156         } cfgx;
 157         u32     cfg_hi;
 158 };
 159
 160
 161 /**
 162  * struct intel_mid_dma_chan - internal mid representation of a DMA channel
 163  * @chan: dma_chan strcture represetation for mid chan
 164  * @ch_regs: MMIO register space pointer to channel register
 165  * @dma_base: MMIO register space DMA engine base pointer
 166  * @ch_id: DMA channel id
 167  * @lock: channel spinlock
 168  * @completed: DMA cookie
 169  * @active_list: current active descriptors
 170  * @queue: current queued up descriptors
 171  * @free_list: current free descriptors
 172  * @slave: dma slave struture
 173  * @descs_allocated: total number of decsiptors allocated
 174  * @dma: dma device struture pointer
 175  * @busy: bool representing if ch is busy (active txn) or not
 176  * @in_use: bool representing if ch is in use or not
 177  * @raw_tfr: raw trf interrupt received
 178  * @raw_block: raw block interrupt received
 179  */
 180 struct intel_mid_dma_chan {
 181         struct dma_chan         chan;
 182         void __iomem            *ch_regs;
 183         void __iomem            *dma_base;
 184         int                     ch_id;
 185         spinlock_t              lock;
 186         dma_cookie_t            completed;
 187         struct list_head        active_list;
 188         struct list_head        queue;
 189         struct list_head        free_list;
 190         unsigned int            descs_allocated;
 191         struct middma_device    *dma;
 192         bool                    busy;
 193         bool                    in_use;
 194         u32                     raw_tfr;
 195         u32                     raw_block;
 196         struct intel_mid_dma_slave *mid_slave;
 197 };
 198
 199 static inline struct intel_mid_dma_chan *to_intel_mid_dma_chan(
 200                                                 struct dma_chan *chan)
 201 {
 202         return container_of(chan, struct intel_mid_dma_chan, chan);
 203 }
 204
 205 enum intel_mid_dma_state {
 206         RUNNING = 0,
 207         SUSPENDED,
 208 };
 209 /**
 210  * struct middma_device - internal representation of a DMA device
 211  * @pdev: PCI device
 212  * @dma_base: MMIO register space pointer of DMA
 213  * @dma_pool: for allocating DMA descriptors
 214  * @common: embedded struct dma_device
 215  * @tasklet: dma tasklet for processing interrupts
 216  * @ch: per channel data
 217  * @pci_id: DMA device PCI ID
 218  * @intr_mask: Interrupt mask to be used
 219  * @mask_reg: MMIO register for periphral mask
 220  * @chan_base: Base ch index (read from driver data)
 221  * @max_chan: max number of chs supported (from drv_data)
 222  * @block_size: Block size of DMA transfer supported (from drv_data)
 223  * @pimr_mask: MMIO register addr for periphral interrupt (from drv_data)
 224  * @state: dma PM device state
 225  */
 226 struct middma_device {
 227         struct pci_dev          *pdev;
 228         void __iomem            *dma_base;
 229         struct pci_pool         *dma_pool;
 230         struct dma_device       common;
 231         struct tasklet_struct   tasklet;
 232         struct intel_mid_dma_chan ch[MAX_CHAN];
 233         unsigned int            pci_id;
 234         unsigned int            intr_mask;
 235         void __iomem            *mask_reg;
 236         int                     chan_base;
 237         int                     max_chan;
 238         int                     block_size;
 239         unsigned int            pimr_mask;
 240         enum intel_mid_dma_state state;
 241 };
 242
 243 static inline struct middma_device *to_middma_device(struct dma_device *common)
 244 {
 245         return container_of(common, struct middma_device, common);
 246 }
 247
 248 struct intel_mid_dma_desc {
 249         void __iomem                    *block; /*ch ptr*/
 250         struct list_head                desc_node;
 251         struct dma_async_tx_descriptor  txd;
 252         size_t                          len;
 253         dma_addr_t                      sar;
 254         dma_addr_t                      dar;
 255         u32                             cfg_hi;
 256         u32                             cfg_lo;
 257         u32                             ctl_lo;
 258         u32                             ctl_hi;
 259         struct pci_pool                 *lli_pool;
 260         struct intel_mid_dma_lli        *lli;
 261         dma_addr_t                      lli_phys;
 262         unsigned int                    lli_length;
 263         unsigned int                    current_lli;
 264         dma_addr_t                      next;
 265         enum dma_transfer_direction             dirn;
 266         enum dma_status                 status;
 267         enum dma_slave_buswidth         width; /*width of DMA txn*/
 268         enum intel_mid_dma_mode         cfg_mode; /*mode configuration*/
 269
 270 };
 271
 272 struct intel_mid_dma_lli {
 273         dma_addr_t                      sar;
 274         dma_addr_t                      dar;
 275         dma_addr_t                      llp;
 276         u32                             ctl_lo;
 277         u32                             ctl_hi;
 278 } __attribute__ ((packed));
 279
 280 static inline int test_ch_en(void __iomem *dma, u32 ch_no)
 281 {
 282         u32 en_reg = ioread32(dma + DMA_CHAN_EN);
 283         return (en_reg >> ch_no) & 0x1;
 284 }
 285
 286 static inline struct intel_mid_dma_desc *to_intel_mid_dma_desc
 287                 (struct dma_async_tx_descriptor *txd)
 288 {
 289         return container_of(txd, struct intel_mid_dma_desc, txd);
 290 }
 291
 292 static inline struct intel_mid_dma_slave *to_intel_mid_dma_slave
 293                 (struct dma_slave_config *slave)
 294 {
 295         return container_of(slave, struct intel_mid_dma_slave, dma_slave);
 296 }
 297
 298
 299 int dma_resume(struct device *dev);
 300
 301 #endif /*__INTEL_MID_DMAC_REGS_H__*/