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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 */
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 */
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