linux/arch/ppc/syslib/mpc52xx_setup.c
Linus Torvalds 1da177e4c3 Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!
2005-04-16 15:20:36 -07:00

231 lines
5.4 KiB
C

/*
* arch/ppc/syslib/mpc52xx_setup.c
*
* Common code for the boards based on Freescale MPC52xx embedded CPU.
*
*
* Maintainer : Sylvain Munaut <tnt@246tNt.com>
*
* Support for other bootloaders than UBoot by Dale Farnsworth
* <dfarnsworth@mvista.com>
*
* Copyright (C) 2004 Sylvain Munaut <tnt@246tNt.com>
* Copyright (C) 2003 Montavista Software, Inc
*
* This file is licensed under the terms of the GNU General Public License
* version 2. This program is licensed "as is" without any warranty of any
* kind, whether express or implied.
*/
#include <linux/config.h>
#include <asm/io.h>
#include <asm/time.h>
#include <asm/mpc52xx.h>
#include <asm/mpc52xx_psc.h>
#include <asm/pgtable.h>
#include <asm/ppcboot.h>
extern bd_t __res;
static int core_mult[] = { /* CPU Frequency multiplier, taken */
0, 0, 0, 10, 20, 20, 25, 45, /* from the datasheet used to compute */
30, 55, 40, 50, 0, 60, 35, 0, /* CPU frequency from XLB freq and */
30, 25, 65, 10, 70, 20, 75, 45, /* external jumper config */
0, 55, 40, 50, 80, 60, 35, 0
};
void
mpc52xx_restart(char *cmd)
{
struct mpc52xx_gpt __iomem *gpt0 = MPC52xx_VA(MPC52xx_GPTx_OFFSET(0));
local_irq_disable();
/* Turn on the watchdog and wait for it to expire. It effectively
does a reset */
out_be32(&gpt0->count, 0x000000ff);
out_be32(&gpt0->mode, 0x00009004);
while (1);
}
void
mpc52xx_halt(void)
{
local_irq_disable();
while (1);
}
void
mpc52xx_power_off(void)
{
/* By default we don't have any way of shut down.
If a specific board wants to, it can set the power down
code to any hardware implementation dependent code */
mpc52xx_halt();
}
void __init
mpc52xx_set_bat(void)
{
/* Set BAT 2 to map the 0xf0000000 area */
/* This mapping is used during mpc52xx_progress,
* mpc52xx_find_end_of_memory, and UARTs/GPIO access for debug
*/
mb();
mtspr(SPRN_DBAT2U, 0xf0001ffe);
mtspr(SPRN_DBAT2L, 0xf000002a);
mb();
}
void __init
mpc52xx_map_io(void)
{
/* Here we only map the MBAR */
io_block_mapping(
MPC52xx_MBAR_VIRT, MPC52xx_MBAR, MPC52xx_MBAR_SIZE, _PAGE_IO);
}
#ifdef CONFIG_SERIAL_TEXT_DEBUG
#ifndef MPC52xx_PF_CONSOLE_PORT
#error "mpc52xx PSC for console not selected"
#endif
static void
mpc52xx_psc_putc(struct mpc52xx_psc __iomem *psc, unsigned char c)
{
while (!(in_be16(&psc->mpc52xx_psc_status) &
MPC52xx_PSC_SR_TXRDY));
out_8(&psc->mpc52xx_psc_buffer_8, c);
}
void
mpc52xx_progress(char *s, unsigned short hex)
{
char c;
struct mpc52xx_psc __iomem *psc;
psc = MPC52xx_VA(MPC52xx_PSCx_OFFSET(MPC52xx_PF_CONSOLE_PORT));
while ((c = *s++) != 0) {
if (c == '\n')
mpc52xx_psc_putc(psc, '\r');
mpc52xx_psc_putc(psc, c);
}
mpc52xx_psc_putc(psc, '\r');
mpc52xx_psc_putc(psc, '\n');
}
#endif /* CONFIG_SERIAL_TEXT_DEBUG */
unsigned long __init
mpc52xx_find_end_of_memory(void)
{
u32 ramsize = __res.bi_memsize;
/*
* if bootloader passed a memsize, just use it
* else get size from sdram config registers
*/
if (ramsize == 0) {
struct mpc52xx_mmap_ctl __iomem *mmap_ctl;
u32 sdram_config_0, sdram_config_1;
/* Temp BAT2 mapping active when this is called ! */
mmap_ctl = MPC52xx_VA(MPC52xx_MMAP_CTL_OFFSET);
sdram_config_0 = in_be32(&mmap_ctl->sdram0);
sdram_config_1 = in_be32(&mmap_ctl->sdram1);
if ((sdram_config_0 & 0x1f) >= 0x13)
ramsize = 1 << ((sdram_config_0 & 0xf) + 17);
if (((sdram_config_1 & 0x1f) >= 0x13) &&
((sdram_config_1 & 0xfff00000) == ramsize))
ramsize += 1 << ((sdram_config_1 & 0xf) + 17);
}
return ramsize;
}
void __init
mpc52xx_calibrate_decr(void)
{
int current_time, previous_time;
int tbl_start, tbl_end;
unsigned int xlbfreq, cpufreq, ipbfreq, pcifreq, divisor;
xlbfreq = __res.bi_busfreq;
/* if bootloader didn't pass bus frequencies, calculate them */
if (xlbfreq == 0) {
/* Get RTC & Clock manager modules */
struct mpc52xx_rtc __iomem *rtc;
struct mpc52xx_cdm __iomem *cdm;
rtc = ioremap(MPC52xx_PA(MPC52xx_RTC_OFFSET), MPC52xx_RTC_SIZE);
cdm = ioremap(MPC52xx_PA(MPC52xx_CDM_OFFSET), MPC52xx_CDM_SIZE);
if ((rtc==NULL) || (cdm==NULL))
panic("Can't ioremap RTC/CDM while computing bus freq");
/* Count bus clock during 1/64 sec */
out_be32(&rtc->dividers, 0x8f1f0000); /* Set RTC 64x faster */
previous_time = in_be32(&rtc->time);
while ((current_time = in_be32(&rtc->time)) == previous_time) ;
tbl_start = get_tbl();
previous_time = current_time;
while ((current_time = in_be32(&rtc->time)) == previous_time) ;
tbl_end = get_tbl();
out_be32(&rtc->dividers, 0xffff0000); /* Restore RTC */
/* Compute all frequency from that & CDM settings */
xlbfreq = (tbl_end - tbl_start) << 8;
cpufreq = (xlbfreq * core_mult[in_be32(&cdm->rstcfg)&0x1f])/10;
ipbfreq = (in_8(&cdm->ipb_clk_sel) & 1) ?
xlbfreq / 2 : xlbfreq;
switch (in_8(&cdm->pci_clk_sel) & 3) {
case 0:
pcifreq = ipbfreq;
break;
case 1:
pcifreq = ipbfreq / 2;
break;
default:
pcifreq = xlbfreq / 4;
break;
}
__res.bi_busfreq = xlbfreq;
__res.bi_intfreq = cpufreq;
__res.bi_ipbfreq = ipbfreq;
__res.bi_pcifreq = pcifreq;
/* Release mapping */
iounmap(rtc);
iounmap(cdm);
}
divisor = 4;
tb_ticks_per_jiffy = xlbfreq / HZ / divisor;
tb_to_us = mulhwu_scale_factor(xlbfreq / divisor, 1000000);
}
int mpc52xx_match_psc_function(int psc_idx, const char *func)
{
struct mpc52xx_psc_func *cf = mpc52xx_psc_functions;
while ((cf->id != -1) && (cf->func != NULL)) {
if ((cf->id == psc_idx) && !strcmp(cf->func,func))
return 1;
cf++;
}
return 0;
}