arch/cris/arch-v32/mach-fs/dma.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /* Wrapper for DMA channel allocator that starts clocks etc */
   3
   4 #include <linux/kernel.h>
   5 #include <linux/spinlock.h>
   6 #include <asm/dma.h>
   7 #include <hwregs/reg_map.h>
   8 #include <hwregs/reg_rdwr.h>
   9 #include <hwregs/marb_defs.h>
  10 #include <hwregs/config_defs.h>
  11 #include <hwregs/strmux_defs.h>
  12 #include <linux/errno.h>
  13 #include <mach/arbiter.h>
  14
  15 static char used_dma_channels[MAX_DMA_CHANNELS];
  16 static const char *used_dma_channels_users[MAX_DMA_CHANNELS];
  17
  18 static DEFINE_SPINLOCK(dma_lock);
  19
  20 int crisv32_request_dma(unsigned int dmanr, const char *device_id,
  21                         unsigned options, unsigned int bandwidth,
  22                         enum dma_owner owner)
  23 {
  24         unsigned long flags;
  25         reg_config_rw_clk_ctrl clk_ctrl;
  26         reg_strmux_rw_cfg strmux_cfg;
  27
  28         if (crisv32_arbiter_allocate_bandwidth(dmanr,
  29                                                options & DMA_INT_MEM ?
  30                                                INT_REGION : EXT_REGION,
  31                                                bandwidth))
  32                 return -ENOMEM;
  33
  34         spin_lock_irqsave(&dma_lock, flags);
  35
  36         if (used_dma_channels[dmanr]) {
  37                 spin_unlock_irqrestore(&dma_lock, flags);
  38                 if (options & DMA_VERBOSE_ON_ERROR) {
  39                         printk(KERN_ERR "Failed to request DMA %i for %s, "
  40                                 "already allocated by %s\n",
  41                                 dmanr,
  42                                 device_id,
  43                                 used_dma_channels_users[dmanr]);
  44                 }
  45                 if (options & DMA_PANIC_ON_ERROR)
  46                         panic("request_dma error!");
  47                 return -EBUSY;
  48         }
  49         clk_ctrl = REG_RD(config, regi_config, rw_clk_ctrl);
  50         strmux_cfg = REG_RD(strmux, regi_strmux, rw_cfg);
  51
  52         switch (dmanr) {
  53         case 0:
  54         case 1:
  55                 clk_ctrl.dma01_eth0 = 1;
  56                 break;
  57         case 2:
  58         case 3:
  59                 clk_ctrl.dma23 = 1;
  60                 break;
  61         case 4:
  62         case 5:
  63                 clk_ctrl.dma45 = 1;
  64                 break;
  65         case 6:
  66         case 7:
  67                 clk_ctrl.dma67 = 1;
  68                 break;
  69         case 8:
  70         case 9:
  71                 clk_ctrl.dma89_strcop = 1;
  72                 break;
  73 #if MAX_DMA_CHANNELS-1 != 9
  74 #error Check dma.c
  75 #endif
  76         default:
  77                 spin_unlock_irqrestore(&dma_lock, flags);
  78                 if (options & DMA_VERBOSE_ON_ERROR) {
  79                         printk(KERN_ERR "Failed to request DMA %i for %s, "
  80                                 "only 0-%i valid)\n",
  81                                 dmanr, device_id, MAX_DMA_CHANNELS - 1);
  82                 }
  83
  84                 if (options & DMA_PANIC_ON_ERROR)
  85                         panic("request_dma error!");
  86                 return -EINVAL;
  87         }
  88
  89         switch (owner) {
  90         case dma_eth0:
  91                 if (dmanr == 0)
  92                         strmux_cfg.dma0 = regk_strmux_eth0;
  93                 else if (dmanr == 1)
  94                         strmux_cfg.dma1 = regk_strmux_eth0;
  95                 else
  96                         panic("Invalid DMA channel for eth0\n");
  97                 break;
  98         case dma_eth1:
  99                 if (dmanr == 6)
 100                         strmux_cfg.dma6 = regk_strmux_eth1;
 101                 else if (dmanr == 7)
 102                         strmux_cfg.dma7 = regk_strmux_eth1;
 103                 else
 104                         panic("Invalid DMA channel for eth1\n");
 105                 break;
 106         case dma_iop0:
 107                 if (dmanr == 2)
 108                         strmux_cfg.dma2 = regk_strmux_iop0;
 109                 else if (dmanr == 3)
 110                         strmux_cfg.dma3 = regk_strmux_iop0;
 111                 else
 112                         panic("Invalid DMA channel for iop0\n");
 113                 break;
 114         case dma_iop1:
 115                 if (dmanr == 4)
 116                         strmux_cfg.dma4 = regk_strmux_iop1;
 117                 else if (dmanr == 5)
 118                         strmux_cfg.dma5 = regk_strmux_iop1;
 119                 else
 120                         panic("Invalid DMA channel for iop1\n");
 121                 break;
 122         case dma_ser0:
 123                 if (dmanr == 6)
 124                         strmux_cfg.dma6 = regk_strmux_ser0;
 125                 else if (dmanr == 7)
 126                         strmux_cfg.dma7 = regk_strmux_ser0;
 127                 else
 128                         panic("Invalid DMA channel for ser0\n");
 129                 break;
 130         case dma_ser1:
 131                 if (dmanr == 4)
 132                         strmux_cfg.dma4 = regk_strmux_ser1;
 133                 else if (dmanr == 5)
 134                         strmux_cfg.dma5 = regk_strmux_ser1;
 135                 else
 136                         panic("Invalid DMA channel for ser1\n");
 137                 break;
 138         case dma_ser2:
 139                 if (dmanr == 2)
 140                         strmux_cfg.dma2 = regk_strmux_ser2;
 141                 else if (dmanr == 3)
 142                         strmux_cfg.dma3 = regk_strmux_ser2;
 143                 else
 144                         panic("Invalid DMA channel for ser2\n");
 145                 break;
 146         case dma_ser3:
 147                 if (dmanr == 8)
 148                         strmux_cfg.dma8 = regk_strmux_ser3;
 149                 else if (dmanr == 9)
 150                         strmux_cfg.dma9 = regk_strmux_ser3;
 151                 else
 152                         panic("Invalid DMA channel for ser3\n");
 153                 break;
 154         case dma_sser0:
 155                 if (dmanr == 4)
 156                         strmux_cfg.dma4 = regk_strmux_sser0;
 157                 else if (dmanr == 5)
 158                         strmux_cfg.dma5 = regk_strmux_sser0;
 159                 else
 160                         panic("Invalid DMA channel for sser0\n");
 161                 break;
 162         case dma_sser1:
 163                 if (dmanr == 6)
 164                         strmux_cfg.dma6 = regk_strmux_sser1;
 165                 else if (dmanr == 7)
 166                         strmux_cfg.dma7 = regk_strmux_sser1;
 167                 else
 168                         panic("Invalid DMA channel for sser1\n");
 169                 break;
 170         case dma_ata:
 171                 if (dmanr == 2)
 172                         strmux_cfg.dma2 = regk_strmux_ata;
 173                 else if (dmanr == 3)
 174                         strmux_cfg.dma3 = regk_strmux_ata;
 175                 else
 176                         panic("Invalid DMA channel for ata\n");
 177                 break;
 178         case dma_strp:
 179                 if (dmanr == 8)
 180                         strmux_cfg.dma8 = regk_strmux_strcop;
 181                 else if (dmanr == 9)
 182                         strmux_cfg.dma9 = regk_strmux_strcop;
 183                 else
 184                         panic("Invalid DMA channel for strp\n");
 185                 break;
 186         case dma_ext0:
 187                 if (dmanr == 6)
 188                         strmux_cfg.dma6 = regk_strmux_ext0;
 189                 else
 190                         panic("Invalid DMA channel for ext0\n");
 191                 break;
 192         case dma_ext1:
 193                 if (dmanr == 7)
 194                         strmux_cfg.dma7 = regk_strmux_ext1;
 195                 else
 196                         panic("Invalid DMA channel for ext1\n");
 197                 break;
 198         case dma_ext2:
 199                 if (dmanr == 2)
 200                         strmux_cfg.dma2 = regk_strmux_ext2;
 201                 else if (dmanr == 8)
 202                         strmux_cfg.dma8 = regk_strmux_ext2;
 203                 else
 204                         panic("Invalid DMA channel for ext2\n");
 205                 break;
 206         case dma_ext3:
 207                 if (dmanr == 3)
 208                         strmux_cfg.dma3 = regk_strmux_ext3;
 209                 else if (dmanr == 9)
 210                         strmux_cfg.dma9 = regk_strmux_ext2;
 211                 else
 212                         panic("Invalid DMA channel for ext2\n");
 213                 break;
 214         }
 215
 216         used_dma_channels[dmanr] = 1;
 217         used_dma_channels_users[dmanr] = device_id;
 218         REG_WR(config, regi_config, rw_clk_ctrl, clk_ctrl);
 219         REG_WR(strmux, regi_strmux, rw_cfg, strmux_cfg);
 220         spin_unlock_irqrestore(&dma_lock, flags);
 221         return 0;
 222 }
 223
 224 void crisv32_free_dma(unsigned int dmanr)
 225 {
 226         spin_lock(&dma_lock);
 227         used_dma_channels[dmanr] = 0;
 228         spin_unlock(&dma_lock);
 229 }