| /* |
| * File: arch/blackfin/mach-bf533/head.S |
| * Based on: |
| * Author: Jeff Dionne <jeff@uclinux.org> COPYRIGHT 1998 D. Jeff Dionne |
| * |
| * Created: 1998 |
| * Description: bf533 startup file |
| * |
| * Modified: |
| * Copyright 2004-2006 Analog Devices Inc. |
| * |
| * Bugs: Enter bugs at http://blackfin.uclinux.org/ |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, see the file COPYING, or write |
| * to the Free Software Foundation, Inc., |
| * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| #include <linux/linkage.h> |
| #include <linux/init.h> |
| #include <asm/blackfin.h> |
| #include <asm/trace.h> |
| #if CONFIG_BFIN_KERNEL_CLOCK |
| #include <asm/mach-common/clocks.h> |
| #include <asm/mach/mem_init.h> |
| #endif |
| |
| .extern ___bss_stop |
| .extern ___bss_start |
| .extern _bf53x_relocate_l1_mem |
| |
| #define INITIAL_STACK 0xFFB01000 |
| |
| __INIT |
| |
| ENTRY(__start) |
| /* R0: argument of command line string, passed from uboot, save it */ |
| R7 = R0; |
| /* Enable Cycle Counter and Nesting Of Interrupts */ |
| #ifdef CONFIG_BFIN_SCRATCH_REG_CYCLES |
| R0 = SYSCFG_SNEN; |
| #else |
| R0 = SYSCFG_SNEN | SYSCFG_CCEN; |
| #endif |
| SYSCFG = R0; |
| R0 = 0; |
| |
| /* Clear Out All the data and pointer Registers */ |
| R1 = R0; |
| R2 = R0; |
| R3 = R0; |
| R4 = R0; |
| R5 = R0; |
| R6 = R0; |
| |
| P0 = R0; |
| P1 = R0; |
| P2 = R0; |
| P3 = R0; |
| P4 = R0; |
| P5 = R0; |
| |
| LC0 = r0; |
| LC1 = r0; |
| L0 = r0; |
| L1 = r0; |
| L2 = r0; |
| L3 = r0; |
| |
| /* Clear Out All the DAG Registers */ |
| B0 = r0; |
| B1 = r0; |
| B2 = r0; |
| B3 = r0; |
| |
| I0 = r0; |
| I1 = r0; |
| I2 = r0; |
| I3 = r0; |
| |
| M0 = r0; |
| M1 = r0; |
| M2 = r0; |
| M3 = r0; |
| |
| trace_buffer_init(p0,r0); |
| P0 = R1; |
| R0 = R1; |
| |
| p0.h = hi(FIO_MASKA_C); |
| p0.l = lo(FIO_MASKA_C); |
| r0 = 0xFFFF(Z); |
| w[p0] = r0.L; /* Disable all interrupts */ |
| ssync; |
| |
| p0.h = hi(FIO_MASKB_C); |
| p0.l = lo(FIO_MASKB_C); |
| r0 = 0xFFFF(Z); |
| w[p0] = r0.L; /* Disable all interrupts */ |
| ssync; |
| |
| /* Turn off the icache */ |
| p0.l = LO(IMEM_CONTROL); |
| p0.h = HI(IMEM_CONTROL); |
| R1 = [p0]; |
| R0 = ~ENICPLB; |
| R0 = R0 & R1; |
| |
| /* Anomaly 05000125 */ |
| #if ANOMALY_05000125 |
| CLI R2; |
| SSYNC; |
| #endif |
| [p0] = R0; |
| SSYNC; |
| #if ANOMALY_05000125 |
| STI R2; |
| #endif |
| |
| /* Turn off the dcache */ |
| p0.l = LO(DMEM_CONTROL); |
| p0.h = HI(DMEM_CONTROL); |
| R1 = [p0]; |
| R0 = ~ENDCPLB; |
| R0 = R0 & R1; |
| |
| /* Anomaly 05000125 */ |
| #if ANOMALY_05000125 |
| CLI R2; |
| SSYNC; |
| #endif |
| [p0] = R0; |
| SSYNC; |
| #if ANOMALY_05000125 |
| STI R2; |
| #endif |
| |
| /* Initialise UART - when booting from u-boot, the UART is not disabled |
| * so if we dont initalize here, our serial console gets hosed */ |
| p0.h = hi(BFIN_UART_LCR); |
| p0.l = lo(BFIN_UART_LCR); |
| r0 = 0x0(Z); |
| w[p0] = r0.L; /* To enable DLL writes */ |
| ssync; |
| |
| p0.h = hi(BFIN_UART_DLL); |
| p0.l = lo(BFIN_UART_DLL); |
| r0 = 0x0(Z); |
| w[p0] = r0.L; |
| ssync; |
| |
| p0.h = hi(BFIN_UART_DLH); |
| p0.l = lo(BFIN_UART_DLH); |
| r0 = 0x00(Z); |
| w[p0] = r0.L; |
| ssync; |
| |
| p0.h = hi(BFIN_UART_GCTL); |
| p0.l = lo(BFIN_UART_GCTL); |
| r0 = 0x0(Z); |
| w[p0] = r0.L; /* To enable UART clock */ |
| ssync; |
| |
| /* Initialize stack pointer */ |
| sp.l = lo(INITIAL_STACK); |
| sp.h = hi(INITIAL_STACK); |
| fp = sp; |
| usp = sp; |
| |
| #ifdef CONFIG_EARLY_PRINTK |
| SP += -12; |
| call _init_early_exception_vectors; |
| SP += 12; |
| #endif |
| |
| /* Put The Code for PLL Programming and SDRAM Programming in L1 ISRAM */ |
| call _bf53x_relocate_l1_mem; |
| #if CONFIG_BFIN_KERNEL_CLOCK |
| call _start_dma_code; |
| #endif |
| |
| /* Code for initializing Async memory banks */ |
| |
| p2.h = hi(EBIU_AMBCTL1); |
| p2.l = lo(EBIU_AMBCTL1); |
| r0.h = hi(AMBCTL1VAL); |
| r0.l = lo(AMBCTL1VAL); |
| [p2] = r0; |
| ssync; |
| |
| p2.h = hi(EBIU_AMBCTL0); |
| p2.l = lo(EBIU_AMBCTL0); |
| r0.h = hi(AMBCTL0VAL); |
| r0.l = lo(AMBCTL0VAL); |
| [p2] = r0; |
| ssync; |
| |
| p2.h = hi(EBIU_AMGCTL); |
| p2.l = lo(EBIU_AMGCTL); |
| r0 = AMGCTLVAL; |
| w[p2] = r0; |
| ssync; |
| |
| /* This section keeps the processor in supervisor mode |
| * during kernel boot. Switches to user mode at end of boot. |
| * See page 3-9 of Hardware Reference manual for documentation. |
| */ |
| |
| /* EVT15 = _real_start */ |
| |
| p0.l = lo(EVT15); |
| p0.h = hi(EVT15); |
| p1.l = _real_start; |
| p1.h = _real_start; |
| [p0] = p1; |
| csync; |
| |
| p0.l = lo(IMASK); |
| p0.h = hi(IMASK); |
| p1.l = IMASK_IVG15; |
| p1.h = 0x0; |
| [p0] = p1; |
| csync; |
| |
| raise 15; |
| p0.l = .LWAIT_HERE; |
| p0.h = .LWAIT_HERE; |
| reti = p0; |
| #if ANOMALY_05000281 |
| nop; nop; nop; |
| #endif |
| rti; |
| |
| .LWAIT_HERE: |
| jump .LWAIT_HERE; |
| ENDPROC(__start) |
| |
| ENTRY(_real_start) |
| [ -- sp ] = reti; |
| p0.l = lo(WDOG_CTL); |
| p0.h = hi(WDOG_CTL); |
| r0 = 0xAD6(z); |
| w[p0] = r0; /* watchdog off for now */ |
| ssync; |
| |
| /* Code update for BSS size == 0 |
| * Zero out the bss region. |
| */ |
| |
| p1.l = ___bss_start; |
| p1.h = ___bss_start; |
| p2.l = ___bss_stop; |
| p2.h = ___bss_stop; |
| r0 = 0; |
| p2 -= p1; |
| lsetup (.L_clear_bss, .L_clear_bss) lc0 = p2; |
| .L_clear_bss: |
| B[p1++] = r0; |
| |
| /* In case there is a NULL pointer reference |
| * Zero out region before stext |
| */ |
| |
| p1.l = 0x0; |
| p1.h = 0x0; |
| r0.l = __stext; |
| r0.h = __stext; |
| r0 = r0 >> 1; |
| p2 = r0; |
| r0 = 0; |
| lsetup (.L_clear_zero, .L_clear_zero) lc0 = p2; |
| .L_clear_zero: |
| W[p1++] = r0; |
| |
| /* pass the uboot arguments to the global value command line */ |
| R0 = R7; |
| call _cmdline_init; |
| |
| p1.l = __rambase; |
| p1.h = __rambase; |
| r0.l = __sdata; |
| r0.h = __sdata; |
| [p1] = r0; |
| |
| p1.l = __ramstart; |
| p1.h = __ramstart; |
| p3.l = ___bss_stop; |
| p3.h = ___bss_stop; |
| |
| r1 = p3; |
| [p1] = r1; |
| |
| /* |
| * load the current thread pointer and stack |
| */ |
| r1.l = _init_thread_union; |
| r1.h = _init_thread_union; |
| |
| r2.l = 0x2000; |
| r2.h = 0x0000; |
| r1 = r1 + r2; |
| sp = r1; |
| usp = sp; |
| fp = sp; |
| jump.l _start_kernel; |
| ENDPROC(_real_start) |
| |
| __FINIT |
| |
| .section .l1.text |
| #if CONFIG_BFIN_KERNEL_CLOCK |
| ENTRY(_start_dma_code) |
| p0.h = hi(SIC_IWR); |
| p0.l = lo(SIC_IWR); |
| r0.l = 0x1; |
| r0.h = 0x0; |
| [p0] = r0; |
| SSYNC; |
| |
| /* |
| * Set PLL_CTL |
| * - [14:09] = MSEL[5:0] : CLKIN / VCO multiplication factors |
| * - [8] = BYPASS : BYPASS the PLL, run CLKIN into CCLK/SCLK |
| * - [7] = output delay (add 200ps of delay to mem signals) |
| * - [6] = input delay (add 200ps of input delay to mem signals) |
| * - [5] = PDWN : 1=All Clocks off |
| * - [3] = STOPCK : 1=Core Clock off |
| * - [1] = PLL_OFF : 1=Disable Power to PLL |
| * - [0] = DF : 1=Pass CLKIN/2 to PLL / 0=Pass CLKIN to PLL |
| * all other bits set to zero |
| */ |
| |
| p0.h = hi(PLL_LOCKCNT); |
| p0.l = lo(PLL_LOCKCNT); |
| r0 = 0x300(Z); |
| w[p0] = r0.l; |
| ssync; |
| |
| P2.H = hi(EBIU_SDGCTL); |
| P2.L = lo(EBIU_SDGCTL); |
| R0 = [P2]; |
| BITSET (R0, 24); |
| [P2] = R0; |
| SSYNC; |
| |
| r0 = CONFIG_VCO_MULT & 63; /* Load the VCO multiplier */ |
| r0 = r0 << 9; /* Shift it over, */ |
| r1 = CLKIN_HALF; /* Do we need to divide CLKIN by 2?*/ |
| r0 = r1 | r0; |
| r1 = PLL_BYPASS; /* Bypass the PLL? */ |
| r1 = r1 << 8; /* Shift it over */ |
| r0 = r1 | r0; /* add them all together */ |
| |
| p0.h = hi(PLL_CTL); |
| p0.l = lo(PLL_CTL); /* Load the address */ |
| cli r2; /* Disable interrupts */ |
| ssync; |
| w[p0] = r0.l; /* Set the value */ |
| idle; /* Wait for the PLL to stablize */ |
| sti r2; /* Enable interrupts */ |
| |
| .Lcheck_again: |
| p0.h = hi(PLL_STAT); |
| p0.l = lo(PLL_STAT); |
| R0 = W[P0](Z); |
| CC = BITTST(R0,5); |
| if ! CC jump .Lcheck_again; |
| |
| /* Configure SCLK & CCLK Dividers */ |
| r0 = (CONFIG_CCLK_ACT_DIV | CONFIG_SCLK_DIV); |
| p0.h = hi(PLL_DIV); |
| p0.l = lo(PLL_DIV); |
| w[p0] = r0.l; |
| ssync; |
| |
| p0.l = lo(EBIU_SDRRC); |
| p0.h = hi(EBIU_SDRRC); |
| r0 = mem_SDRRC; |
| w[p0] = r0.l; |
| ssync; |
| |
| p0.l = LO(EBIU_SDBCTL); |
| p0.h = HI(EBIU_SDBCTL); /* SDRAM Memory Bank Control Register */ |
| r0 = mem_SDBCTL; |
| w[p0] = r0.l; |
| ssync; |
| |
| P2.H = hi(EBIU_SDGCTL); |
| P2.L = lo(EBIU_SDGCTL); |
| R0 = [P2]; |
| BITCLR (R0, 24); |
| p0.h = hi(EBIU_SDSTAT); |
| p0.l = lo(EBIU_SDSTAT); |
| r2.l = w[p0]; |
| cc = bittst(r2,3); |
| if !cc jump .Lskip; |
| NOP; |
| BITSET (R0, 23); |
| .Lskip: |
| [P2] = R0; |
| SSYNC; |
| |
| R0.L = lo(mem_SDGCTL); |
| R0.H = hi(mem_SDGCTL); |
| R1 = [p2]; |
| R1 = R1 | R0; |
| [P2] = R1; |
| SSYNC; |
| |
| p0.h = hi(SIC_IWR); |
| p0.l = lo(SIC_IWR); |
| r0.l = lo(IWR_ENABLE_ALL); |
| r0.h = hi(IWR_ENABLE_ALL); |
| [p0] = r0; |
| SSYNC; |
| |
| RTS; |
| ENDPROC(_start_dma_code) |
| #endif /* CONFIG_BFIN_KERNEL_CLOCK */ |
