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-/*
- * File: arch/blackfin/mach-bf548/head.S
- * Based on: arch/blackfin/mach-bf537/head.S
- * Author: Jeff Dionne <jeff@uclinux.org> COPYRIGHT 1998 D. Jeff Dionne
- *
- * Created: 1998
- * Description: Startup code for Blackfin BF548
- *
- * Modified:
- * Copyright 2004-2007 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)
-
- /* Enable PHY CLK buffer output */
- p0.h = hi(VR_CTL);
- p0.l = lo(VR_CTL);
- r0.l = w[p0];
- bitset(r0, 14);
- w[p0] = r0.l;
- ssync;
-
- p0.h = hi(SIC_IWR0);
- p0.l = lo(SIC_IWR0);
- 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;
-
- /* enable self refresh via SRREQ */
- P2.H = hi(EBIU_RSTCTL);
- P2.L = lo(EBIU_RSTCTL);
- R0 = [P2];
- BITSET (R0, 3);
- [P2] = R0;
- SSYNC;
-
- /* wait for SRACK bit to be set */
-.LSRR_MODE:
- R0 = [P2];
- CC = BITTST(R0, 4);
- if !CC JUMP .LSRR_MODE;
-
- 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
- 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;
-
- /* disable self refresh by clearing SRREQ */
- P2.H = hi(EBIU_RSTCTL);
- P2.L = lo(EBIU_RSTCTL);
- R0 = [P2];
- CC = BITTST(R0, 0);
- if CC jump .Lskipddrrst;
- BITSET (R0, 0);
-.Lskipddrrst:
- BITCLR (R0, 3);
- [P2] = R0;
- SSYNC;
-
- p0.l = lo(EBIU_DDRCTL0);
- p0.h = hi(EBIU_DDRCTL0);
- r0.l = lo(mem_DDRCTL0);
- r0.h = hi(mem_DDRCTL0);
- [p0] = r0;
- ssync;
-
- p0.l = lo(EBIU_DDRCTL1);
- p0.h = hi(EBIU_DDRCTL1);
- r0.l = lo(mem_DDRCTL1);
- r0.h = hi(mem_DDRCTL1);
- [p0] = r0;
- ssync;
-
- p0.l = lo(EBIU_DDRCTL2);
- p0.h = hi(EBIU_DDRCTL2);
- r0.l = lo(mem_DDRCTL2);
- r0.h = hi(mem_DDRCTL2);
- [p0] = r0;
- ssync;
-
- RTS;
-ENDPROC(_start_dma_code)
-#endif /* CONFIG_BFIN_KERNEL_CLOCK */