projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 09e1f70e MF |
1 | /* |
| 2 | * Common Blackfin startup code | |
| 3 | * | |
| 4 | * Copyright 2004-2008 Analog Devices Inc. | |
| 5 | * | |
| 6 | * Enter bugs at http://blackfin.uclinux.org/ | |
| 7 | * | |
| 8 | * Licensed under the GPL-2 or later. | |
| 9 | */ | |
| 10 | ||
| 11 | #include <linux/linkage.h> | |
| 12 | #include <linux/init.h> | |
| 13 | #include <asm/blackfin.h> | |
| 67618fd8 | 14 | #include <asm/thread_info.h> |
| 09e1f70e MF |
15 | #include <asm/trace.h> |
| 16 | ||
| 17e89bcf MF |
17 | __INIT |
| 18 | ||
| 19 | #define INITIAL_STACK (L1_SCRATCH_START + L1_SCRATCH_LENGTH - 12) | |
| 20 | ||
| 21 | ENTRY(__start) | |
| 22 | /* R0: argument of command line string, passed from uboot, save it */ | |
| 23 | R7 = R0; | |
| 24 | /* Enable Cycle Counter and Nesting Of Interrupts */ | |
| 25 | #ifdef CONFIG_BFIN_SCRATCH_REG_CYCLES | |
| 26 | R0 = SYSCFG_SNEN; | |
| 27 | #else | |
| 28 | R0 = SYSCFG_SNEN | SYSCFG_CCEN; | |
| 29 | #endif | |
| 30 | SYSCFG = R0; | |
| 31 | R0 = 0; | |
| 32 | ||
| 33 | /* Clear Out All the data and pointer Registers */ | |
| 34 | R1 = R0; | |
| 35 | R2 = R0; | |
| 36 | R3 = R0; | |
| 37 | R4 = R0; | |
| 38 | R5 = R0; | |
| 39 | R6 = R0; | |
| 40 | ||
| 41 | P0 = R0; | |
| 42 | P1 = R0; | |
| 43 | P2 = R0; | |
| 44 | P3 = R0; | |
| 45 | P4 = R0; | |
| 46 | P5 = R0; | |
| 47 | ||
| 48 | LC0 = r0; | |
| 49 | LC1 = r0; | |
| 50 | L0 = r0; | |
| 51 | L1 = r0; | |
| 52 | L2 = r0; | |
| 53 | L3 = r0; | |
| 54 | ||
| 55 | /* Clear Out All the DAG Registers */ | |
| 56 | B0 = r0; | |
| 57 | B1 = r0; | |
| 58 | B2 = r0; | |
| 59 | B3 = r0; | |
| 60 | ||
| 61 | I0 = r0; | |
| 62 | I1 = r0; | |
| 63 | I2 = r0; | |
| 64 | I3 = r0; | |
| 65 | ||
| 66 | M0 = r0; | |
| 67 | M1 = r0; | |
| 68 | M2 = r0; | |
| 69 | M3 = r0; | |
| 70 | ||
| 71 | trace_buffer_init(p0,r0); | |
| 72 | P0 = R1; | |
| 73 | R0 = R1; | |
| 74 | ||
| 75 | /* Turn off the icache */ | |
| 76 | p0.l = LO(IMEM_CONTROL); | |
| 77 | p0.h = HI(IMEM_CONTROL); | |
| 78 | R1 = [p0]; | |
| 79 | R0 = ~ENICPLB; | |
| 80 | R0 = R0 & R1; | |
| 81 | [p0] = R0; | |
| 82 | SSYNC; | |
| 83 | ||
| 84 | /* Turn off the dcache */ | |
| 85 | p0.l = LO(DMEM_CONTROL); | |
| 86 | p0.h = HI(DMEM_CONTROL); | |
| 87 | R1 = [p0]; | |
| 88 | R0 = ~ENDCPLB; | |
| 89 | R0 = R0 & R1; | |
| 90 | [p0] = R0; | |
| 91 | SSYNC; | |
| 92 | ||
| 93 | /* Let each Blackfin family do its own thing */ | |
| 94 | call _mach_early_start; | |
| 95 | ||
| 96 | /* Initialize stack pointer */ | |
| 97 | sp.l = lo(INITIAL_STACK); | |
| 98 | sp.h = hi(INITIAL_STACK); | |
| 99 | fp = sp; | |
| 100 | usp = sp; | |
| 101 | ||
| 102 | #ifdef CONFIG_EARLY_PRINTK | |
| 103 | call _init_early_exception_vectors; | |
| 104 | #endif | |
| 105 | ||
| 106 | /* Put The Code for PLL Programming and SDRAM Programming in L1 ISRAM */ | |
| 107 | call _bf53x_relocate_l1_mem; | |
| 108 | #ifdef CONFIG_BFIN_KERNEL_CLOCK | |
| 109 | call _start_dma_code; | |
| 110 | #endif | |
| 111 | ||
| 112 | /* This section keeps the processor in supervisor mode | |
| 113 | * during kernel boot. Switches to user mode at end of boot. | |
| 114 | * See page 3-9 of Hardware Reference manual for documentation. | |
| 115 | */ | |
| 116 | ||
| 117 | /* EVT15 = _real_start */ | |
| 118 | ||
| 119 | p0.l = lo(EVT15); | |
| 120 | p0.h = hi(EVT15); | |
| 121 | p1.l = _real_start; | |
| 122 | p1.h = _real_start; | |
| 123 | [p0] = p1; | |
| 124 | csync; | |
| 125 | ||
| 126 | p0.l = lo(IMASK); | |
| 127 | p0.h = hi(IMASK); | |
| 128 | p1.l = IMASK_IVG15; | |
| 129 | p1.h = 0x0; | |
| 130 | [p0] = p1; | |
| 131 | csync; | |
| 132 | ||
| 133 | raise 15; | |
| 134 | p0.l = .LWAIT_HERE; | |
| 135 | p0.h = .LWAIT_HERE; | |
| 136 | reti = p0; | |
| 137 | #if ANOMALY_05000281 | |
| 138 | nop; nop; nop; | |
| 139 | #endif | |
| 140 | rti; | |
| 141 | ||
| 142 | .LWAIT_HERE: | |
| 143 | jump .LWAIT_HERE; | |
| 144 | ENDPROC(__start) | |
| 145 | ||
| 09e1f70e MF |
146 | /* A little BF561 glue ... */ |
| 147 | #ifndef WDOG_CTL | |
| 148 | # define WDOG_CTL WDOGA_CTL | |
| 149 | #endif | |
| 150 | ||
| 09e1f70e MF |
151 | ENTRY(_real_start) |
| 152 | /* Enable nested interrupts */ | |
| 153 | [--sp] = reti; | |
| 154 | ||
| 155 | /* watchdog off for now */ | |
| 156 | p0.l = lo(WDOG_CTL); | |
| 157 | p0.h = hi(WDOG_CTL); | |
| 158 | r0 = 0xAD6(z); | |
| 159 | w[p0] = r0; | |
| 160 | ssync; | |
| 161 | ||
| 162 | /* Zero out the bss region | |
| 163 | * Note: this will fail if bss is 0 bytes ... | |
| 164 | */ | |
| 165 | r0 = 0 (z); | |
| 166 | r1.l = ___bss_start; | |
| 167 | r1.h = ___bss_start; | |
| 168 | r2.l = ___bss_stop; | |
| 169 | r2.h = ___bss_stop; | |
| 170 | r2 = r2 - r1; | |
| 171 | r2 >>= 2; | |
| 172 | p1 = r1; | |
| 173 | p2 = r2; | |
| 174 | lsetup (.L_clear_bss, .L_clear_bss) lc0 = p2; | |
| 175 | .L_clear_bss: | |
| 176 | [p1++] = r0; | |
| 177 | ||
| 178 | /* In case there is a NULL pointer reference, | |
| 179 | * zero out region before stext | |
| 180 | */ | |
| 181 | p1 = r0; | |
| 182 | r2.l = __stext; | |
| 183 | r2.h = __stext; | |
| 184 | r2 >>= 2; | |
| 185 | p2 = r2; | |
| 186 | lsetup (.L_clear_zero, .L_clear_zero) lc0 = p2; | |
| 187 | .L_clear_zero: | |
| 188 | [p1++] = r0; | |
| 189 | ||
| 190 | /* Pass the u-boot arguments to the global value command line */ | |
| 191 | R0 = R7; | |
| 192 | call _cmdline_init; | |
| 193 | ||
| 194 | /* Load the current thread pointer and stack */ | |
| 195 | sp.l = _init_thread_union; | |
| 196 | sp.h = _init_thread_union; | |
| 197 | p1 = THREAD_SIZE (z); | |
| 198 | sp = sp + p1; | |
| 199 | usp = sp; | |
| 200 | fp = sp; | |
| 201 | jump.l _start_kernel; | |
| 202 | ENDPROC(_real_start) | |
| 203 | ||
| 204 | __FINIT |