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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2007 Advanced Micro Devices, Inc.
* Copyright (C) 2010 Nils Jacobs
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* 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.
*/
#include <cpu/x86/tsc.h>
#define CLOCK_TICK_RATE 1193180U /* Underlying HZ */
#define CALIBRATE_INTERVAL ((20*CLOCK_TICK_RATE)/1000) /* 20ms */
#define CALIBRATE_DIVISOR (20*1000) /* 20ms / 20000 == 1usec */
/* spll_raw_clk = SYSREF * FbDIV,
* GLIU Clock = spll_raw_clk / MDIV
* CPU Clock = spll_raw_clk / VDIV
*/
/* table for Feedback divisor to FbDiv register value */
static const unsigned char plldiv2fbdiv[] = {
0, 0, 0, 0, 0, 0, 15, 7, 3, 1, 0, 32, 16, 40, 20, 42, /* pll div 0 - 15 */
21, 10, 37, 50, 25, 12, 38, 19, 9, 4, 34, 17, 8, 36, 18, 41, /* pll div 16 - 31 */
52, 26, 45, 54, 27, 13, 6, 35, 49, 56, 28, 46, 23, 11, 05, 02, /* pll div 32 - 47 */
33, 48, 24, 44, 22, 43, 53, 58, 29, 14, 39, 51, 57, 60, 30, 47, /* pll div 48 - 63 */
};
/* table for FbDiv register value to Feedback divisor */
static const unsigned char fbdiv2plldiv[] = {
10, 9, 47, 8, 25, 46, 38, 7, 28, 24, 17, 45, 21, 37, 57, 6,
12, 27, 30, 23, 14, 16, 52, 44, 50, 20, 33, 36, 42, 56, 0, 0,
11, 48, 26, 39, 29, 18, 22, 58, 13, 31, 15, 53, 51, 34, 43, 0,
49, 40, 19, 59, 32, 54, 35, 0, 41, 60, 55, 0, 61, 0, 0, 0
};
/* FbDIV VDIV MDIV CPU/GeodeLink */
/* 12 2 3 200/133 */
/* 16 2 3 266/177 */
/* 18 2 3 300/200 */
/* 20 2 3 333/222 */
/* 22 2 3 366/244 */
/* 24 2 3 400/266 */
/* 26 2 3 433/289 */
/* PLLCHECK_COMPLETED is the "we've already done this" flag */
#define PLLCHECK_COMPLETED (1 << RSTPLL_LOWER_SWFLAGS_SHIFT)
#ifndef RSTPPL_LOWER_BYPASS_SET
#define RSTPPL_LOWER_BYPASS_SET (1 << GLCP_SYS_RSTPLL_BYPASS)
#endif // RSTPPL_LOWER_BYPASS_SET
#define DEFAULT_MDIV 3
#define DEFAULT_VDIV 2
static void pll_reset(void)
{
msr_t msrGlcpSysRstpll;
unsigned MDIV_VDIV_FBDIV;
unsigned SyncBits; /* store the sync bits in up ebx */
unsigned DEFAULT_FBDIV;
if (CONFIG_GX2_PROCESSOR_MHZ == 400) {
DEFAULT_FBDIV = 24;
} else if (CONFIG_GX2_PROCESSOR_MHZ == 366) {
DEFAULT_FBDIV = 22;
} else if (CONFIG_GX2_PROCESSOR_MHZ == 300) {
DEFAULT_FBDIV = 18;
} else {
post_code(POST_PLL_CPU_VER_FAIL);
die("Unsupported GX2_PROCESSOR_MHZ setting!\n");
}
/* clear the Bypass bit */
/* If the straps say we are in bypass and the syspll is not AND there are no software */
/* bits set then FS2 or something set up the PLL and we should not change it. */
msrGlcpSysRstpll = rdmsr(GLCP_SYS_RSTPLL);
msrGlcpSysRstpll.lo &= ~RSTPPL_LOWER_BYPASS_SET;
wrmsr(GLCP_SYS_RSTPLL, msrGlcpSysRstpll);
/* If the "we've already been here" flag is set, don't reconfigure the pll */
if ( !(msrGlcpSysRstpll.lo & PLLCHECK_COMPLETED ) )
{ /* we haven't configured the PLL; do it now */
/* Store PCI33(0)/66(1), SDR(0)/DDR(1), and CRT(0)/TFT(1) in upper esi to get to the */
/* correct Strap Table. */
post_code(POST_PLL_INIT);
/* configure for DDR */
msrGlcpSysRstpll.lo &= ~(1 << RSTPPL_LOWER_SDRMODE_SHIFT);
wrmsr(GLCP_SYS_RSTPLL, msrGlcpSysRstpll);
/* Use Manual settings */
/* UseManual: */
post_code(POST_PLL_MANUAL);
/* DIV settings manually entered. */
/* ax = VDIV, upper eax = MDIV, upper ecx = FbDIV */
/* use gs and fs since we don't need them. */
/* ProgramClocks: */
/* ax = VDIV, upper eax = MDIV, upper ecx = FbDIV */
/* move everything into ebx */
/* VDIV */
MDIV_VDIV_FBDIV = ((DEFAULT_VDIV - 2) << RSTPLL_UPPER_VDIV_SHIFT);
/* MDIV */
MDIV_VDIV_FBDIV |= ((DEFAULT_MDIV - 2) << RSTPLL_UPPER_MDIV_SHIFT);
/* FbDIV */
MDIV_VDIV_FBDIV |= (plldiv2fbdiv[DEFAULT_FBDIV] << RSTPLL_UPPER_FBDIV_SHIFT);
/* write GLCP_SYS_RSTPPL (GLCP reg 0x14) with clock values */
msrGlcpSysRstpll.lo &= ~(1 << RSTPPL_LOWER_SDRMODE_SHIFT);
wrmsr(GLCP_SYS_RSTPLL, msrGlcpSysRstpll);
msrGlcpSysRstpll.hi = MDIV_VDIV_FBDIV;
wrmsr(GLCP_SYS_RSTPLL, msrGlcpSysRstpll);
/* Set Reset, LockWait, and SW flag */
/* DoReset: */
/* CheckSemiSync proc */
/* Check for Semi-Sync in GeodeLink and CPU. */
/* We need to do this here since the strap settings don't account for these bits. */
SyncBits = 0; /* store the sync bits in up ebx */
/* Check for Bypass mode. */
if (msrGlcpSysRstpll.lo & RSTPPL_LOWER_BYPASS_SET)
{
/* If we are in BYPASS PCI may or may not be sync'd but CPU and GeodeLink will. */
SyncBits |= RSTPPL_LOWER_CPU_SEMI_SYNC_SET;
}
else
{
/* CheckPCIsync: */
/* If FBdiv/Mdiv is evenly divisible then set the PCI semi-sync. FB is always greater */
/* look up the real divider... if we get a 0 we have serious problems */
if ( !(fbdiv2plldiv[((msrGlcpSysRstpll.hi >> RSTPLL_UPPER_FBDIV_SHIFT) & 0x3f)] %
(((msrGlcpSysRstpll.hi >> RSTPLL_UPPER_MDIV_SHIFT) & 0x0F) + 2)) )
{
SyncBits |= RSTPPL_LOWER_PCI_SEMI_SYNC_SET;
}
/* CheckCPUSync: */
/* If Vdiv/Mdiv is evenly divisible then set the CPU semi-sync. */
/* CPU is always greater or equal. */
if (!((((msrGlcpSysRstpll.hi >> RSTPLL_UPPER_MDIV_SHIFT) & 0x07) + 2) %
(((msrGlcpSysRstpll.hi >> RSTPLL_UPPER_VDIV_SHIFT) & 0x0F) + 2)))
{
SyncBits |= RSTPPL_LOWER_CPU_SEMI_SYNC_SET;
}
}
/* SetSync: */
msrGlcpSysRstpll.lo &= ~(RSTPPL_LOWER_PCI_SEMI_SYNC_SET | RSTPPL_LOWER_CPU_SEMI_SYNC_SET);
msrGlcpSysRstpll.lo |= SyncBits;
wrmsr(GLCP_SYS_RSTPLL, msrGlcpSysRstpll);
/* CheckSemiSync endp */
/* now we do the reset */
/* Set hold count to 99 (063h) */
msrGlcpSysRstpll.lo &= ~(0x0FF << RSTPPL_LOWER_HOLD_COUNT_SHIFT);
msrGlcpSysRstpll.lo |= (0x0DE << RSTPPL_LOWER_HOLD_COUNT_SHIFT);
msrGlcpSysRstpll.lo |= PLLCHECK_COMPLETED; // Say we are done
wrmsr(GLCP_SYS_RSTPLL, msrGlcpSysRstpll);
/* Don't want to use LOCKWAIT */
msrGlcpSysRstpll.lo |= (RSTPPL_LOWER_PLL_RESET_SET + RSTPPL_LOWER_PD_SET);
msrGlcpSysRstpll.lo |= RSTPPL_LOWER_CHIP_RESET_SET;
wrmsr(GLCP_SYS_RSTPLL, msrGlcpSysRstpll);
/* You should never get here..... The chip has reset. */
post_code(POST_PLL_RESET_FAIL);
die("CONFIGURING PLL FAILURE\n");
} /* we haven't configured the PLL; do it now */
}
static unsigned int GeodeLinkSpeed(void)
{
unsigned geodelinkspeed;
geodelinkspeed = ((CONFIG_GX2_PROCESSOR_MHZ * DEFAULT_VDIV) / DEFAULT_MDIV);
return (geodelinkspeed);
}
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