arch/blackfin/mach-bf561/secondary.S

   1 /*
   2  * File:         arch/blackfin/mach-bf561/secondary.S
   3  * Based on:     arch/blackfin/mach-bf561/head.S
   4  * Author:       Philippe Gerum <rpm@xenomai.org>
   5  *
   6  *               Copyright 2007 Analog Devices Inc.
   7  *
   8  * Description:  BF561 coreB bootstrap file
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, see the file COPYING, or write
  22  * to the Free Software Foundation, Inc.,
  23  * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  24  */
  25
  26 #include <linux/linkage.h>
  27 #include <linux/init.h>
  28 #include <asm/blackfin.h>
  29 #include <asm/asm-offsets.h>
  30
  31 __INIT
  32
  33 /* Lay the initial stack into the L1 scratch area of Core B */
  34 #define INITIAL_STACK   (COREB_L1_SCRATCH_START + L1_SCRATCH_LENGTH - 12)
  35
  36 ENTRY(_coreb_trampoline_start)
  37         /* Set the SYSCFG register */
  38         R0 = 0x36;
  39         SYSCFG = R0; /*Enable Cycle Counter and Nesting Of Interrupts(3rd Bit)*/
  40         R0 = 0;
  41
  42         /*Clear Out All the data and pointer  Registers*/
  43         R1 = R0;
  44         R2 = R0;
  45         R3 = R0;
  46         R4 = R0;
  47         R5 = R0;
  48         R6 = R0;
  49         R7 = R0;
  50
  51         P0 = R0;
  52         P1 = R0;
  53         P2 = R0;
  54         P3 = R0;
  55         P4 = R0;
  56         P5 = R0;
  57
  58         LC0 = r0;
  59         LC1 = r0;
  60         L0 = r0;
  61         L1 = r0;
  62         L2 = r0;
  63         L3 = r0;
  64
  65         /* Clear Out All the DAG Registers*/
  66         B0 = r0;
  67         B1 = r0;
  68         B2 = r0;
  69         B3 = r0;
  70
  71         I0 = r0;
  72         I1 = r0;
  73         I2 = r0;
  74         I3 = r0;
  75
  76         M0 = r0;
  77         M1 = r0;
  78         M2 = r0;
  79         M3 = r0;
  80
  81         /* Turn off the icache */
  82         p0.l = LO(IMEM_CONTROL);
  83         p0.h = HI(IMEM_CONTROL);
  84         R1 = [p0];
  85         R0 = ~ENICPLB;
  86         R0 = R0 & R1;
  87
  88         /* Disabling of CPLBs should be proceeded by a CSYNC */
  89         CSYNC;
  90         [p0] = R0;
  91         SSYNC;
  92
  93         /* Turn off the dcache */
  94         p0.l = LO(DMEM_CONTROL);
  95         p0.h = HI(DMEM_CONTROL);
  96         R1 = [p0];
  97         R0 = ~ENDCPLB;
  98         R0 = R0 & R1;
  99
 100         /* Disabling of CPLBs should be proceeded by a CSYNC */
 101         CSYNC;
 102         [p0] = R0;
 103         SSYNC;
 104
 105         /* in case of double faults, save a few things */
 106         p0.l = _init_retx_coreb;
 107         p0.h = _init_retx_coreb;
 108         R0 = RETX;
 109         [P0] = R0;
 110
 111 #ifdef CONFIG_DEBUG_DOUBLEFAULT
 112         /* Only save these if we are storing them,
 113          * This happens here, since L1 gets clobbered
 114          * below
 115          */
 116         GET_PDA(p0, r0);
 117         r7 = [p0 + PDA_DF_RETX];
 118         p1.l = _init_saved_retx_coreb;
 119         p1.h = _init_saved_retx_coreb;
 120         [p1] = r7;
 121
 122         r7 = [p0 + PDA_DF_DCPLB];
 123         p1.l = _init_saved_dcplb_fault_addr_coreb;
 124         p1.h = _init_saved_dcplb_fault_addr_coreb;
 125         [p1] = r7;
 126
 127         r7 = [p0 + PDA_DF_ICPLB];
 128         p1.l = _init_saved_icplb_fault_addr_coreb;
 129         p1.h = _init_saved_icplb_fault_addr_coreb;
 130         [p1] = r7;
 131
 132         r7 = [p0 + PDA_DF_SEQSTAT];
 133         p1.l = _init_saved_seqstat_coreb;
 134         p1.h = _init_saved_seqstat_coreb;
 135         [p1] = r7;
 136 #endif
 137
 138         /* Initialize stack pointer */
 139         sp.l = lo(INITIAL_STACK);
 140         sp.h = hi(INITIAL_STACK);
 141         fp = sp;
 142         usp = sp;
 143
 144         /* This section keeps the processor in supervisor mode
 145          * during core B startup.  Branches to the idle task.
 146          */
 147
 148         /* EVT15 = _real_start */
 149
 150         p0.l = lo(EVT15);
 151         p0.h = hi(EVT15);
 152         p1.l = _coreb_start;
 153         p1.h = _coreb_start;
 154         [p0] = p1;
 155         csync;
 156
 157         p0.l = lo(IMASK);
 158         p0.h = hi(IMASK);
 159         p1.l = IMASK_IVG15;
 160         p1.h = 0x0;
 161         [p0] = p1;
 162         csync;
 163
 164         raise 15;
 165         p0.l = .LWAIT_HERE;
 166         p0.h = .LWAIT_HERE;
 167         reti = p0;
 168 #if defined(ANOMALY_05000281)
 169         nop; nop; nop;
 170 #endif
 171         rti;
 172
 173 .LWAIT_HERE:
 174         jump .LWAIT_HERE;
 175 ENDPROC(_coreb_trampoline_start)
 176 ENTRY(_coreb_trampoline_end)
 177
 178 ENTRY(_coreb_start)
 179         [--sp] = reti;
 180
 181         p0.l = lo(WDOGB_CTL);
 182         p0.h = hi(WDOGB_CTL);
 183         r0 = 0xAD6(z);
 184         w[p0] = r0;     /* Clear the watchdog. */
 185         ssync;
 186
 187         /*
 188          * switch to IDLE stack.
 189          */
 190         p0.l = _secondary_stack;
 191         p0.h = _secondary_stack;
 192         sp = [p0];
 193         usp = sp;
 194         fp = sp;
 195         sp += -12;
 196         call _init_pda
 197         sp += 12;
 198         call _secondary_start_kernel;
 199 .L_exit:
 200         jump.s  .L_exit;
 201 ENDPROC(_coreb_start)
 202
 203 __FINIT