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/*
* (C) Copyright 2004, Freescale, Inc
* TsiChung Liew, Tsi-Chung.Liew@freescale.com.
*
* See file CREDITS for list of people who contributed to this
* project.
*
* 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, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
#include <common.h>
#include <mpc8220.h>
#include <asm/processor.h>
DECLARE_GLOBAL_DATA_PTR;
typedef struct pllmultiplier {
u8 hid1;
int multi;
int vco_div;
} pllcfg_t;
/* ------------------------------------------------------------------------- */
/*
*
*/
int get_clocks (void)
{
pllcfg_t bus2core[] = {
{0x02, 2, 8}, /* 1 */
{0x01, 2, 4},
{0x0C, 3, 8}, /* 1.5 */
{0x00, 3, 4},
{0x18, 3, 2},
{0x05, 4, 4}, /* 2 */
{0x04, 4, 2},
{0x11, 5, 4}, /* 2.5 */
{0x06, 5, 2},
{0x10, 6, 4}, /* 3 */
{0x08, 6, 2},
{0x0E, 7, 2}, /* 3.5 */
{0x0A, 8, 2}, /* 4 */
{0x07, 9, 2}, /* 4.5 */
{0x0B, 10, 2}, /* 5 */
{0x09, 11, 2}, /* 5.5 */
{0x0D, 12, 2}, /* 6 */
{0x12, 13, 2}, /* 6.5 */
{0x14, 14, 2}, /* 7 */
{0x16, 15, 2}, /* 7.5 */
{0x1C, 16, 2} /* 8 */
};
u32 hid1;
int i, size, pci2bus;
#if !defined(CFG_MPC8220_CLKIN)
#error clock measuring not implemented yet - define CFG_MPC8220_CLKIN
#endif
gd->inp_clk = CFG_MPC8220_CLKIN;
/* Read XLB to PCI(INP) clock multiplier */
pci2bus = (*((volatile u32 *)PCI_REG_PCIGSCR) &
PCI_REG_PCIGSCR_PCI2XLB_CLK_MASK)>>PCI_REG_PCIGSCR_PCI2XLB_CLK_BIT;
/* XLB bus clock */
gd->bus_clk = CFG_MPC8220_CLKIN * pci2bus;
/* PCI clock is same as input clock */
gd->pci_clk = CFG_MPC8220_CLKIN;
/* FlexBus is temporary set as the same as input clock */
/* will do dynamic in the future */
gd->flb_clk = CFG_MPC8220_CLKIN;
/* CPU Clock - Read HID1 */
asm volatile ("mfspr %0, 1009":"=r" (hid1):);
size = sizeof (bus2core) / sizeof (pllcfg_t);
hid1 >>= 27;
for (i = 0; i < size; i++)
if (hid1 == bus2core[i].hid1) {
gd->cpu_clk = (bus2core[i].multi * gd->bus_clk) >> 1;
gd->vco_clk = CFG_MPC8220_SYSPLL_VCO_MULTIPLIER * (gd->pci_clk * bus2core[i].vco_div)/2;
break;
}
/* hardcoded 81MHz for now */
gd->pev_clk = 81000000;
return (0);
}
int prt_mpc8220_clks (void)
{
printf (" Bus %ld MHz, CPU %ld MHz, PCI %ld MHz, VCO %ld MHz\n",
gd->bus_clk / 1000000, gd->cpu_clk / 1000000,
gd->pci_clk / 1000000, gd->vco_clk / 1000000);
return (0);
}
/* ------------------------------------------------------------------------- */
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