arch/powerpc/sysdev/cpm2_common.c

   1 /*
   2  * General Purpose functions for the global management of the
   3  * 8260 Communication Processor Module.
   4  * Copyright (c) 1999-2001 Dan Malek <dan@embeddedalley.com>
   5  * Copyright (c) 2000 MontaVista Software, Inc (source@mvista.com)
   6  *      2.3.99 Updates
   7  *
   8  * 2006 (c) MontaVista Software, Inc.
   9  * Vitaly Bordug <vbordug@ru.mvista.com>
  10  *      Merged to arch/powerpc from arch/ppc/syslib/cpm2_common.c
  11  *
  12  * This file is licensed under the terms of the GNU General Public License
  13  * version 2. This program is licensed "as is" without any warranty of any
  14  * kind, whether express or implied.
  15  */
  16
  17 /*
  18  *
  19  * In addition to the individual control of the communication
  20  * channels, there are a few functions that globally affect the
  21  * communication processor.
  22  *
  23  * Buffer descriptors must be allocated from the dual ported memory
  24  * space.  The allocator for that is here.  When the communication
  25  * process is reset, we reclaim the memory available.  There is
  26  * currently no deallocator for this memory.
  27  */
  28 #include <linux/errno.h>
  29 #include <linux/sched.h>
  30 #include <linux/kernel.h>
  31 #include <linux/param.h>
  32 #include <linux/string.h>
  33 #include <linux/mm.h>
  34 #include <linux/interrupt.h>
  35 #include <linux/module.h>
  36 #include <asm/io.h>
  37 #include <asm/irq.h>
  38 #include <asm/mpc8260.h>
  39 #include <asm/page.h>
  40 #include <asm/pgtable.h>
  41 #include <asm/cpm2.h>
  42 #include <asm/rheap.h>
  43 #include <asm/fs_pd.h>
  44
  45 #include <sysdev/fsl_soc.h>
  46
  47 static void cpm2_dpinit(void);
  48 cpm_cpm2_t      *cpmp;          /* Pointer to comm processor space */
  49
  50 /* We allocate this here because it is used almost exclusively for
  51  * the communication processor devices.
  52  */
  53 cpm2_map_t *cpm2_immr;
  54 intctl_cpm2_t *cpm2_intctl;
  55
  56 #define CPM_MAP_SIZE    (0x40000)       /* 256k - the PQ3 reserve this amount
  57                                            of space for CPM as it is larger
  58                                            than on PQ2 */
  59
  60 void
  61 cpm2_reset(void)
  62 {
  63         cpm2_immr = (cpm2_map_t *)ioremap(CPM_MAP_ADDR, CPM_MAP_SIZE);
  64         cpm2_intctl = cpm2_map(im_intctl);
  65
  66         /* Reclaim the DP memory for our use.
  67          */
  68         cpm2_dpinit();
  69
  70         /* Tell everyone where the comm processor resides.
  71          */
  72         cpmp = &cpm2_immr->im_cpm;
  73 }
  74
  75 /* Set a baud rate generator.  This needs lots of work.  There are
  76  * eight BRGs, which can be connected to the CPM channels or output
  77  * as clocks.  The BRGs are in two different block of internal
  78  * memory mapped space.
  79  * The baud rate clock is the system clock divided by something.
  80  * It was set up long ago during the initial boot phase and is
  81  * is given to us.
  82  * Baud rate clocks are zero-based in the driver code (as that maps
  83  * to port numbers).  Documentation uses 1-based numbering.
  84  */
  85 #define BRG_INT_CLK     (get_brgfreq())
  86 #define BRG_UART_CLK    (BRG_INT_CLK/16)
  87
  88 /* This function is used by UARTS, or anything else that uses a 16x
  89  * oversampled clock.
  90  */
  91 void
  92 cpm_setbrg(uint brg, uint rate)
  93 {
  94         volatile uint   *bp;
  95
  96         /* This is good enough to get SMCs running.....
  97         */
  98         if (brg < 4) {
  99                 bp = cpm2_map_size(im_brgc1, 16);
 100         } else {
 101                 bp = cpm2_map_size(im_brgc5, 16);
 102                 brg -= 4;
 103         }
 104         bp += brg;
 105         *bp = ((BRG_UART_CLK / rate) << 1) | CPM_BRG_EN;
 106
 107         cpm2_unmap(bp);
 108 }
 109
 110 /* This function is used to set high speed synchronous baud rate
 111  * clocks.
 112  */
 113 void
 114 cpm2_fastbrg(uint brg, uint rate, int div16)
 115 {
 116         volatile uint   *bp;
 117
 118         if (brg < 4) {
 119                 bp = cpm2_map_size(im_brgc1, 16);
 120         }
 121         else {
 122                 bp = cpm2_map_size(im_brgc5, 16);
 123                 brg -= 4;
 124         }
 125         bp += brg;
 126         *bp = ((BRG_INT_CLK / rate) << 1) | CPM_BRG_EN;
 127         if (div16)
 128                 *bp |= CPM_BRG_DIV16;
 129
 130         cpm2_unmap(bp);
 131 }
 132
 133 int cpm2_clk_setup(enum cpm_clk_target target, int clock, int mode)
 134 {
 135         int ret = 0;
 136         int shift;
 137         int i, bits = 0;
 138         cpmux_t *im_cpmux;
 139         u32 *reg;
 140         u32 mask = 7;
 141         u8 clk_map [24][3] = {
 142                 {CPM_CLK_FCC1, CPM_BRG5, 0},
 143                 {CPM_CLK_FCC1, CPM_BRG6, 1},
 144                 {CPM_CLK_FCC1, CPM_BRG7, 2},
 145                 {CPM_CLK_FCC1, CPM_BRG8, 3},
 146                 {CPM_CLK_FCC1, CPM_CLK9, 4},
 147                 {CPM_CLK_FCC1, CPM_CLK10, 5},
 148                 {CPM_CLK_FCC1, CPM_CLK11, 6},
 149                 {CPM_CLK_FCC1, CPM_CLK12, 7},
 150                 {CPM_CLK_FCC2, CPM_BRG5, 0},
 151                 {CPM_CLK_FCC2, CPM_BRG6, 1},
 152                 {CPM_CLK_FCC2, CPM_BRG7, 2},
 153                 {CPM_CLK_FCC2, CPM_BRG8, 3},
 154                 {CPM_CLK_FCC2, CPM_CLK13, 4},
 155                 {CPM_CLK_FCC2, CPM_CLK14, 5},
 156                 {CPM_CLK_FCC2, CPM_CLK15, 6},
 157                 {CPM_CLK_FCC2, CPM_CLK16, 7},
 158                 {CPM_CLK_FCC3, CPM_BRG5, 0},
 159                 {CPM_CLK_FCC3, CPM_BRG6, 1},
 160                 {CPM_CLK_FCC3, CPM_BRG7, 2},
 161                 {CPM_CLK_FCC3, CPM_BRG8, 3},
 162                 {CPM_CLK_FCC3, CPM_CLK13, 4},
 163                 {CPM_CLK_FCC3, CPM_CLK14, 5},
 164                 {CPM_CLK_FCC3, CPM_CLK15, 6},
 165                 {CPM_CLK_FCC3, CPM_CLK16, 7}
 166                 };
 167
 168         im_cpmux = cpm2_map(im_cpmux);
 169
 170         switch (target) {
 171         case CPM_CLK_SCC1:
 172                 reg = &im_cpmux->cmx_scr;
 173                 shift = 24;
 174         case CPM_CLK_SCC2:
 175                 reg = &im_cpmux->cmx_scr;
 176                 shift = 16;
 177                 break;
 178         case CPM_CLK_SCC3:
 179                 reg = &im_cpmux->cmx_scr;
 180                 shift = 8;
 181                 break;
 182         case CPM_CLK_SCC4:
 183                 reg = &im_cpmux->cmx_scr;
 184                 shift = 0;
 185                 break;
 186         case CPM_CLK_FCC1:
 187                 reg = &im_cpmux->cmx_fcr;
 188                 shift = 24;
 189                 break;
 190         case CPM_CLK_FCC2:
 191                 reg = &im_cpmux->cmx_fcr;
 192                 shift = 16;
 193                 break;
 194         case CPM_CLK_FCC3:
 195                 reg = &im_cpmux->cmx_fcr;
 196                 shift = 8;
 197                 break;
 198         default:
 199                 printk(KERN_ERR "cpm2_clock_setup: invalid clock target\n");
 200                 return -EINVAL;
 201         }
 202
 203         if (mode == CPM_CLK_RX)
 204                 shift +=3;
 205
 206         for (i=0; i<24; i++) {
 207                 if (clk_map[i][0] == target && clk_map[i][1] == clock) {
 208                         bits = clk_map[i][2];
 209                         break;
 210                 }
 211         }
 212         if (i == sizeof(clk_map)/3)
 213             ret = -EINVAL;
 214
 215         bits <<= shift;
 216         mask <<= shift;
 217         out_be32(reg, (in_be32(reg) & ~mask) | bits);
 218
 219         cpm2_unmap(im_cpmux);
 220         return ret;
 221 }
 222
 223 /*
 224  * dpalloc / dpfree bits.
 225  */
 226 static spinlock_t cpm_dpmem_lock;
 227 /* 16 blocks should be enough to satisfy all requests
 228  * until the memory subsystem goes up... */
 229 static rh_block_t cpm_boot_dpmem_rh_block[16];
 230 static rh_info_t cpm_dpmem_info;
 231 static u8* im_dprambase;
 232
 233 static void cpm2_dpinit(void)
 234 {
 235         spin_lock_init(&cpm_dpmem_lock);
 236
 237         im_dprambase = ioremap(CPM_MAP_ADDR, CPM_DATAONLY_BASE + CPM_DATAONLY_SIZE);
 238
 239         /* initialize the info header */
 240         rh_init(&cpm_dpmem_info, 1,
 241                         sizeof(cpm_boot_dpmem_rh_block) /
 242                         sizeof(cpm_boot_dpmem_rh_block[0]),
 243                         cpm_boot_dpmem_rh_block);
 244
 245         /* Attach the usable dpmem area */
 246         /* XXX: This is actually crap. CPM_DATAONLY_BASE and
 247          * CPM_DATAONLY_SIZE is only a subset of the available dpram. It
 248          * varies with the processor and the microcode patches activated.
 249          * But the following should be at least safe.
 250          */
 251         rh_attach_region(&cpm_dpmem_info, (void *)CPM_DATAONLY_BASE,
 252                         CPM_DATAONLY_SIZE);
 253 }
 254
 255 /* This function returns an index into the DPRAM area.
 256  */
 257 uint cpm_dpalloc(uint size, uint align)
 258 {
 259         void *start;
 260         unsigned long flags;
 261
 262         spin_lock_irqsave(&cpm_dpmem_lock, flags);
 263         cpm_dpmem_info.alignment = align;
 264         start = rh_alloc(&cpm_dpmem_info, size, "commproc");
 265         spin_unlock_irqrestore(&cpm_dpmem_lock, flags);
 266
 267         return (uint)start;
 268 }
 269 EXPORT_SYMBOL(cpm_dpalloc);
 270
 271 int cpm_dpfree(uint offset)
 272 {
 273         int ret;
 274         unsigned long flags;
 275
 276         spin_lock_irqsave(&cpm_dpmem_lock, flags);
 277         ret = rh_free(&cpm_dpmem_info, (void *)offset);
 278         spin_unlock_irqrestore(&cpm_dpmem_lock, flags);
 279
 280         return ret;
 281 }
 282 EXPORT_SYMBOL(cpm_dpfree);
 283
 284 /* not sure if this is ever needed */
 285 uint cpm_dpalloc_fixed(uint offset, uint size, uint align)
 286 {
 287         void *start;
 288         unsigned long flags;
 289
 290         spin_lock_irqsave(&cpm_dpmem_lock, flags);
 291         cpm_dpmem_info.alignment = align;
 292         start = rh_alloc_fixed(&cpm_dpmem_info, (void *)offset, size, "commproc");
 293         spin_unlock_irqrestore(&cpm_dpmem_lock, flags);
 294
 295         return (uint)start;
 296 }
 297 EXPORT_SYMBOL(cpm_dpalloc_fixed);
 298
 299 void cpm_dpdump(void)
 300 {
 301         rh_dump(&cpm_dpmem_info);
 302 }
 303 EXPORT_SYMBOL(cpm_dpdump);
 304
 305 void *cpm_dpram_addr(uint offset)
 306 {
 307         return (void *)(im_dprambase + offset);
 308 }
 309 EXPORT_SYMBOL(cpm_dpram_addr);