| /* |
| * 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> |
| #ifdef CONFIG_BFIN_KERNEL_CLOCK |
| #include <asm/clocks.h> |
| #include <mach/mem_init.h> |
| #endif |
| |
| .section .l1.text |
| #ifdef 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 */ |
| #ifdef ANOMALY_05000265 |
| r0 = BITSET(r0, 15); /* Add 250 mV of hysteresis to SPORT input pins */ |
| #endif |
| |
| 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; |
| |
| 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; |
| |
| RTS; |
| ENDPROC(_start_dma_code) |
| #endif /* CONFIG_BFIN_KERNEL_CLOCK */ |