forked from luck/tmp_suning_uos_patched
c09c4e0065
Signed-off-by: Mike Frysinger <michael.frysinger@analog.com> Signed-off-by: Bryan Wu <bryan.wu@analog.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
560 lines
11 KiB
ArmAsm
560 lines
11 KiB
ArmAsm
/*
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* File: arch/blackfin/mach-bf537/head.S
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* Based on: arch/blackfin/mach-bf533/head.S
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* Author: Jeff Dionne <jeff@uclinux.org> COPYRIGHT 1998 D. Jeff Dionne
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*
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* Created: 1998
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* Description: Startup code for Blackfin BF537
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*
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* Modified:
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* Copyright 2004-2006 Analog Devices Inc.
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*
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* Bugs: Enter bugs at http://blackfin.uclinux.org/
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see the file COPYING, or write
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* to the Free Software Foundation, Inc.,
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* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <linux/linkage.h>
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#include <asm/blackfin.h>
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#if CONFIG_BFIN_KERNEL_CLOCK
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#include <asm/mach/mem_init.h>
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#endif
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.global __rambase
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.global __ramstart
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.global __ramend
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.extern ___bss_stop
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.extern ___bss_start
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.extern _bf53x_relocate_l1_mem
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#define INITIAL_STACK 0xFFB01000
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.text
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ENTRY(__start)
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ENTRY(__stext)
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/* R0: argument of command line string, passed from uboot, save it */
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R7 = R0;
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/* Set the SYSCFG register */
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R0 = 0x36;
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SYSCFG = R0; /*Enable Cycle Counter and Nesting Of Interrupts(3rd Bit)*/
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R0 = 0;
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/* Clear Out All the data and pointer Registers*/
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R1 = R0;
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R2 = R0;
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R3 = R0;
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R4 = R0;
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R5 = R0;
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R6 = R0;
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P0 = R0;
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P1 = R0;
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P2 = R0;
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P3 = R0;
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P4 = R0;
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P5 = R0;
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LC0 = r0;
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LC1 = r0;
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L0 = r0;
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L1 = r0;
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L2 = r0;
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L3 = r0;
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/* Clear Out All the DAG Registers*/
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B0 = r0;
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B1 = r0;
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B2 = r0;
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B3 = r0;
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I0 = r0;
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I1 = r0;
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I2 = r0;
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I3 = r0;
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M0 = r0;
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M1 = r0;
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M2 = r0;
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M3 = r0;
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/* Turn off the icache */
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p0.l = (IMEM_CONTROL & 0xFFFF);
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p0.h = (IMEM_CONTROL >> 16);
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R1 = [p0];
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R0 = ~ENICPLB;
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R0 = R0 & R1;
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/* Anomaly 05000125 */
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#ifdef ANOMALY_05000125
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CLI R2;
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SSYNC;
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#endif
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[p0] = R0;
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SSYNC;
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#ifdef ANOMALY_05000125
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STI R2;
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#endif
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/* Turn off the dcache */
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p0.l = (DMEM_CONTROL & 0xFFFF);
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p0.h = (DMEM_CONTROL >> 16);
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R1 = [p0];
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R0 = ~ENDCPLB;
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R0 = R0 & R1;
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/* Anomaly 05000125 */
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#ifdef ANOMALY_05000125
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CLI R2;
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SSYNC;
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#endif
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[p0] = R0;
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SSYNC;
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#ifdef ANOMALY_05000125
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STI R2;
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#endif
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/* Initialise General-Purpose I/O Modules on BF537 */
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/* Rev 0.0 Anomaly 05000212 - PORTx_FER,
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* PORT_MUX Registers Do Not accept "writes" correctly:
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*/
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p0.h = hi(BFIN_PORT_MUX);
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p0.l = lo(BFIN_PORT_MUX);
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#ifdef ANOMALY_05000212
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R0.L = W[P0]; /* Read */
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SSYNC;
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#endif
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R0 = (PGDE_UART | PFTE_UART)(Z);
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#ifdef ANOMALY_05000212
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W[P0] = R0.L; /* Write */
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SSYNC;
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#endif
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W[P0] = R0.L; /* Enable both UARTS */
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SSYNC;
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p0.h = hi(PORTF_FER);
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p0.l = lo(PORTF_FER);
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#ifdef ANOMALY_05000212
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R0.L = W[P0]; /* Read */
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SSYNC;
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#endif
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R0 = 0x000F(Z);
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#ifdef ANOMALY_05000212
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W[P0] = R0.L; /* Write */
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SSYNC;
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#endif
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/* Enable peripheral function of PORTF for UART0 and UART1 */
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W[P0] = R0.L;
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SSYNC;
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#if !defined(CONFIG_BF534)
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p0.h = hi(EMAC_SYSTAT);
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p0.l = lo(EMAC_SYSTAT);
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R0.h = 0xFFFF; /* Clear EMAC Interrupt Status bits */
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R0.l = 0xFFFF;
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[P0] = R0;
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SSYNC;
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#endif
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#ifdef CONFIG_BF537_PORT_H
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p0.h = hi(PORTH_FER);
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p0.l = lo(PORTH_FER);
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R0.L = W[P0]; /* Read */
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SSYNC;
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R0 = 0x0000;
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W[P0] = R0.L; /* Write */
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SSYNC;
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W[P0] = R0.L; /* Disable peripheral function of PORTH */
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SSYNC;
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#endif
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/* Initialise UART - when booting from u-boot, the UART is not disabled
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* so if we dont initalize here, our serial console gets hosed */
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p0.h = hi(UART_LCR);
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p0.l = lo(UART_LCR);
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r0 = 0x0(Z);
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w[p0] = r0.L; /* To enable DLL writes */
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ssync;
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p0.h = hi(UART_DLL);
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p0.l = lo(UART_DLL);
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r0 = 0x00(Z);
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w[p0] = r0.L;
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ssync;
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p0.h = hi(UART_DLH);
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p0.l = lo(UART_DLH);
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r0 = 0x00(Z);
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w[p0] = r0.L;
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ssync;
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p0.h = hi(UART_GCTL);
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p0.l = lo(UART_GCTL);
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r0 = 0x0(Z);
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w[p0] = r0.L; /* To enable UART clock */
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ssync;
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/* Initialize stack pointer */
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sp.l = lo(INITIAL_STACK);
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sp.h = hi(INITIAL_STACK);
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fp = sp;
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usp = sp;
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/* Put The Code for PLL Programming and SDRAM Programming in L1 ISRAM */
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call _bf53x_relocate_l1_mem;
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#if CONFIG_BFIN_KERNEL_CLOCK
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call _start_dma_code;
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#endif
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/* Code for initializing Async memory banks */
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p2.h = hi(EBIU_AMBCTL1);
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p2.l = lo(EBIU_AMBCTL1);
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r0.h = hi(AMBCTL1VAL);
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r0.l = lo(AMBCTL1VAL);
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[p2] = r0;
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ssync;
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p2.h = hi(EBIU_AMBCTL0);
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p2.l = lo(EBIU_AMBCTL0);
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r0.h = hi(AMBCTL0VAL);
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r0.l = lo(AMBCTL0VAL);
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[p2] = r0;
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ssync;
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p2.h = hi(EBIU_AMGCTL);
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p2.l = lo(EBIU_AMGCTL);
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r0 = AMGCTLVAL;
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w[p2] = r0;
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ssync;
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/* This section keeps the processor in supervisor mode
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* during kernel boot. Switches to user mode at end of boot.
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* See page 3-9 of Hardware Reference manual for documentation.
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*/
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/* EVT15 = _real_start */
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p0.l = lo(EVT15);
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p0.h = hi(EVT15);
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p1.l = _real_start;
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p1.h = _real_start;
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[p0] = p1;
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csync;
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p0.l = lo(IMASK);
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p0.h = hi(IMASK);
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p1.l = IMASK_IVG15;
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p1.h = 0x0;
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[p0] = p1;
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csync;
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raise 15;
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p0.l = .LWAIT_HERE;
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p0.h = .LWAIT_HERE;
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reti = p0;
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#if defined(ANOMALY_05000281)
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nop; nop; nop;
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#endif
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rti;
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.LWAIT_HERE:
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jump .LWAIT_HERE;
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ENTRY(_real_start)
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[ -- sp ] = reti;
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p0.l = lo(WDOG_CTL);
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p0.h = hi(WDOG_CTL);
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r0 = 0xAD6(z);
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w[p0] = r0; /* watchdog off for now */
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ssync;
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/* Code update for BSS size == 0
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* Zero out the bss region.
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*/
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p1.l = ___bss_start;
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p1.h = ___bss_start;
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p2.l = ___bss_stop;
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p2.h = ___bss_stop;
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r0 = 0;
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p2 -= p1;
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lsetup (.L_clear_bss, .L_clear_bss ) lc0 = p2;
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.L_clear_bss:
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B[p1++] = r0;
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/* In case there is a NULL pointer reference
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* Zero out region before stext
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*/
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p1.l = 0x0;
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p1.h = 0x0;
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r0.l = __stext;
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r0.h = __stext;
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r0 = r0 >> 1;
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p2 = r0;
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r0 = 0;
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lsetup (.L_clear_zero, .L_clear_zero ) lc0 = p2;
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.L_clear_zero:
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W[p1++] = r0;
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/* pass the uboot arguments to the global value command line */
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R0 = R7;
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call _cmdline_init;
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p1.l = __rambase;
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p1.h = __rambase;
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r0.l = __sdata;
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r0.h = __sdata;
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[p1] = r0;
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p1.l = __ramstart;
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p1.h = __ramstart;
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p3.l = ___bss_stop;
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p3.h = ___bss_stop;
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r1 = p3;
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[p1] = r1;
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/*
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* load the current thread pointer and stack
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*/
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r1.l = _init_thread_union;
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r1.h = _init_thread_union;
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r2.l = 0x2000;
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r2.h = 0x0000;
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r1 = r1 + r2;
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sp = r1;
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usp = sp;
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fp = sp;
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call _start_kernel;
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.L_exit:
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jump.s .L_exit;
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.section .l1.text
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#if CONFIG_BFIN_KERNEL_CLOCK
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ENTRY(_start_dma_code)
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/* Enable PHY CLK buffer output */
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p0.h = hi(VR_CTL);
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p0.l = lo(VR_CTL);
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r0.l = w[p0];
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bitset(r0, 14);
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w[p0] = r0.l;
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ssync;
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p0.h = hi(SIC_IWR);
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p0.l = lo(SIC_IWR);
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r0.l = 0x1;
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r0.h = 0x0;
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[p0] = r0;
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SSYNC;
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/*
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* Set PLL_CTL
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* - [14:09] = MSEL[5:0] : CLKIN / VCO multiplication factors
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* - [8] = BYPASS : BYPASS the PLL, run CLKIN into CCLK/SCLK
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* - [7] = output delay (add 200ps of delay to mem signals)
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* - [6] = input delay (add 200ps of input delay to mem signals)
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* - [5] = PDWN : 1=All Clocks off
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* - [3] = STOPCK : 1=Core Clock off
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* - [1] = PLL_OFF : 1=Disable Power to PLL
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* - [0] = DF : 1=Pass CLKIN/2 to PLL / 0=Pass CLKIN to PLL
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* all other bits set to zero
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*/
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p0.h = hi(PLL_LOCKCNT);
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p0.l = lo(PLL_LOCKCNT);
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r0 = 0x300(Z);
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w[p0] = r0.l;
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ssync;
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P2.H = hi(EBIU_SDGCTL);
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P2.L = lo(EBIU_SDGCTL);
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R0 = [P2];
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BITSET (R0, 24);
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[P2] = R0;
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SSYNC;
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r0 = CONFIG_VCO_MULT & 63; /* Load the VCO multiplier */
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r0 = r0 << 9; /* Shift it over, */
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r1 = CLKIN_HALF; /* Do we need to divide CLKIN by 2?*/
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r0 = r1 | r0;
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r1 = PLL_BYPASS; /* Bypass the PLL? */
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r1 = r1 << 8; /* Shift it over */
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r0 = r1 | r0; /* add them all together */
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p0.h = hi(PLL_CTL);
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p0.l = lo(PLL_CTL); /* Load the address */
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cli r2; /* Disable interrupts */
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ssync;
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w[p0] = r0.l; /* Set the value */
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idle; /* Wait for the PLL to stablize */
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sti r2; /* Enable interrupts */
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.Lcheck_again:
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p0.h = hi(PLL_STAT);
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p0.l = lo(PLL_STAT);
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R0 = W[P0](Z);
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CC = BITTST(R0,5);
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if ! CC jump .Lcheck_again;
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/* Configure SCLK & CCLK Dividers */
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r0 = (CONFIG_CCLK_ACT_DIV | CONFIG_SCLK_DIV);
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p0.h = hi(PLL_DIV);
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p0.l = lo(PLL_DIV);
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w[p0] = r0.l;
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ssync;
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p0.l = lo(EBIU_SDRRC);
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p0.h = hi(EBIU_SDRRC);
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r0 = mem_SDRRC;
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w[p0] = r0.l;
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ssync;
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p0.l = (EBIU_SDBCTL & 0xFFFF);
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p0.h = (EBIU_SDBCTL >> 16); /* SDRAM Memory Bank Control Register */
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r0 = mem_SDBCTL;
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w[p0] = r0.l;
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ssync;
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P2.H = hi(EBIU_SDGCTL);
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P2.L = lo(EBIU_SDGCTL);
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R0 = [P2];
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BITCLR (R0, 24);
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p0.h = hi(EBIU_SDSTAT);
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p0.l = lo(EBIU_SDSTAT);
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r2.l = w[p0];
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cc = bittst(r2,3);
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if !cc jump .Lskip;
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NOP;
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BITSET (R0, 23);
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.Lskip:
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[P2] = R0;
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SSYNC;
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R0.L = lo(mem_SDGCTL);
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R0.H = hi(mem_SDGCTL);
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R1 = [p2];
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R1 = R1 | R0;
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[P2] = R1;
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SSYNC;
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p0.h = hi(SIC_IWR);
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p0.l = lo(SIC_IWR);
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r0.l = lo(IWR_ENABLE_ALL);
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r0.h = hi(IWR_ENABLE_ALL);
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[p0] = r0;
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SSYNC;
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RTS;
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#endif /* CONFIG_BFIN_KERNEL_CLOCK */
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ENTRY(_bfin_reset)
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/* No more interrupts to be handled*/
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CLI R6;
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SSYNC;
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#if defined(CONFIG_MTD_M25P80)
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/*
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* The following code fix the SPI flash reboot issue,
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* /CS signal of the chip which is using PF10 return to GPIO mode
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*/
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p0.h = hi(PORTF_FER);
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p0.l = lo(PORTF_FER);
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r0.l = 0x0000;
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w[p0] = r0.l;
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SSYNC;
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/* /CS return to high */
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p0.h = hi(PORTFIO);
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p0.l = lo(PORTFIO);
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r0.l = 0xFFFF;
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w[p0] = r0.l;
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SSYNC;
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/* Delay some time, This is necessary */
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r1.h = 0;
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r1.l = 0x400;
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p1 = r1;
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lsetup (.L_delay_lab1, .L_delay_lab1_end) lc1 = p1;
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.L_delay_lab1:
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r0.h = 0;
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r0.l = 0x8000;
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p0 = r0;
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lsetup (.L_delay_lab0, .L_delay_lab0_end) lc0 = p0;
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.L_delay_lab0:
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nop;
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.L_delay_lab0_end:
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nop;
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.L_delay_lab1_end:
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nop;
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#endif
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/* Clear the IMASK register */
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p0.h = hi(IMASK);
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p0.l = lo(IMASK);
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r0 = 0x0;
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[p0] = r0;
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|
/* Clear the ILAT register */
|
|
p0.h = hi(ILAT);
|
|
p0.l = lo(ILAT);
|
|
r0 = [p0];
|
|
[p0] = r0;
|
|
SSYNC;
|
|
|
|
/* make sure SYSCR is set to use BMODE */
|
|
P0.h = hi(SYSCR);
|
|
P0.l = lo(SYSCR);
|
|
R0.l = 0x0;
|
|
W[P0] = R0.l;
|
|
SSYNC;
|
|
|
|
/* issue a system soft reset */
|
|
P1.h = hi(SWRST);
|
|
P1.l = lo(SWRST);
|
|
R1.l = 0x0007;
|
|
W[P1] = R1;
|
|
SSYNC;
|
|
|
|
/* clear system soft reset */
|
|
R0.l = 0x0000;
|
|
W[P0] = R0;
|
|
SSYNC;
|
|
|
|
/* issue core reset */
|
|
raise 1;
|
|
|
|
RTS;
|
|
ENDPROC(_bfin_reset)
|
|
|
|
.data
|
|
|
|
/*
|
|
* Set up the usable of RAM stuff. Size of RAM is determined then
|
|
* an initial stack set up at the end.
|
|
*/
|
|
|
|
.align 4
|
|
__rambase:
|
|
.long 0
|
|
__ramstart:
|
|
.long 0
|
|
__ramend:
|
|
.long 0
|