// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2000-2002
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
*/
/*
* m8xx.c
*
* CPU specific code
*
* written or collected and sometimes rewritten by
* Magnus Damm <damm@bitsmart.com>
*
* minor modifications by
* Wolfgang Denk <wd@denx.de>
*/
#include <common.h>
#include <watchdog.h>
#include <command.h>
#include <mpc8xx.h>
#include <netdev.h>
#include <asm/cache.h>
#include <asm/cpm_8xx.h>
#include <linux/compiler.h>
#include <asm/io.h>
#if defined(CONFIG_OF_LIBFDT)
#include <linux/libfdt.h>
#include <fdt_support.h>
#endif
DECLARE_GLOBAL_DATA_PTR;
static int check_CPU(long clock, uint pvr, uint immr)
{
immap_t __iomem *immap = (immap_t __iomem *)CONFIG_SYS_IMMR;
uint k;
char buf[32];
/* the highest 16 bits should be 0x0050 for a 860 */
if (PVR_VER(pvr) != PVR_VER(PVR_8xx))
return -1;
k = (immr << 16) |
in_be16(&immap->im_cpm.cp_dparam16[PROFF_REVNUM / sizeof(u16)]);
/*
* Some boards use sockets so different CPUs can be used.
* We have to check chip version in run time.
*/
switch (k) {
/* MPC866P/MPC866T/MPC859T/MPC859DSL/MPC852T */
case 0x08010004: /* Rev. A.0 */
printf("MPC866xxxZPnnA");
break;
case 0x08000003: /* Rev. 0.3 */
printf("MPC866xxxZPnn");
break;
case 0x09000000: /* 870/875/880/885 */
puts("MPC885ZPnn");
break;
default:
printf("unknown MPC86x (0x%08x)", k);
break;
}
printf(" at %s MHz: ", strmhz(buf, clock));
print_size(checkicache(), " I-Cache ");
print_size(checkdcache(), " D-Cache");
/* do we have a FEC (860T/P or 852/859/866/885)? */
out_be32(&immap->im_cpm.cp_fec.fec_addr_low, 0x12345678);
if (in_be32(&immap->im_cpm.cp_fec.fec_addr_low) == 0x12345678)
printf(" FEC present");
putc('\n');
return 0;
}
/* ------------------------------------------------------------------------- */
int checkcpu(void)
{
ulong clock = gd->cpu_clk;
uint immr = get_immr(); /* Return full IMMR contents */
uint pvr = get_pvr();
puts("CPU: ");
return check_CPU(clock, pvr, immr);
}
/* ------------------------------------------------------------------------- */
/* L1 i-cache */
int checkicache(void)
{
immap_t __iomem *immap = (immap_t __iomem *)CONFIG_SYS_IMMR;
memctl8xx_t __iomem *memctl = &immap->im_memctl;
u32 cacheon = rd_ic_cst() & IDC_ENABLED;
/* probe in flash memoryarea */
u32 k = in_be32(&memctl->memc_br0) & ~0x00007fff;
u32 m;
u32 lines = -1;
wr_ic_cst(IDC_UNALL);
wr_ic_cst(IDC_INVALL);
wr_ic_cst(IDC_DISABLE);
__asm__ volatile ("isync");
while (!((m = rd_ic_cst()) & IDC_CERR2)) {
wr_ic_adr(k);
wr_ic_cst(IDC_LDLCK);
__asm__ volatile ("isync");
lines++;
k += 0x10; /* the number of bytes in a cacheline */
}
wr_ic_cst(IDC_UNALL);
wr_ic_cst(IDC_INVALL);
if (cacheon)
wr_ic_cst(IDC_ENABLE);
else
wr_ic_cst(IDC_DISABLE);
__asm__ volatile ("isync");
return lines << 4;
};
/* ------------------------------------------------------------------------- */
/* L1 d-cache */
/* call with cache disabled */
int checkdcache(void)
{
immap_t __iomem *immap = (immap_t __iomem *)CONFIG_SYS_IMMR;
memctl8xx_t __iomem *memctl = &immap->im_memctl;
u32 cacheon = rd_dc_cst() & IDC_ENABLED;
/* probe in flash memoryarea */
u32 k = in_be32(&memctl->memc_br0) & ~0x00007fff;
u32 m;
u32 lines = -1;
wr_dc_cst(IDC_UNALL);
wr_dc_cst(IDC_INVALL);
wr_dc_cst(IDC_DISABLE);
while (!((m = rd_dc_cst()) & IDC_CERR2)) {
wr_dc_adr(k);
wr_dc_cst(IDC_LDLCK);
lines++;
k += 0x10; /* the number of bytes in a cacheline */
}
wr_dc_cst(IDC_UNALL);
wr_dc_cst(IDC_INVALL);
if (cacheon)
wr_dc_cst(IDC_ENABLE);
else
wr_dc_cst(IDC_DISABLE);
return lines << 4;
};
/* ------------------------------------------------------------------------- */
void upmconfig(uint upm, uint *table, uint size)
{
uint i;
uint addr = 0;
immap_t __iomem *immap = (immap_t __iomem *)CONFIG_SYS_IMMR;
memctl8xx_t __iomem *memctl = &immap->im_memctl;
for (i = 0; i < size; i++) {
out_be32(&memctl->memc_mdr, table[i]); /* (16-15) */
out_be32(&memctl->memc_mcr, addr | upm); /* (16-16) */
addr++;
}
}
/* ------------------------------------------------------------------------- */
int do_reset(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
ulong msr, addr;
immap_t __iomem *immap = (immap_t __iomem *)CONFIG_SYS_IMMR;
/* Checkstop Reset enable */
setbits_be32(&immap->im_clkrst.car_plprcr, PLPRCR_CSR);
/* Interrupts and MMU off */
__asm__ volatile ("mtspr 81, 0");
__asm__ volatile ("mfmsr %0" : "=r" (msr));
msr &= ~0x1030;
__asm__ volatile ("mtmsr %0" : : "r" (msr));
/*
* Trying to execute the next instruction at a non-existing address
* should cause a machine check, resulting in reset
*/
#ifdef CONFIG_SYS_RESET_ADDRESS
addr = CONFIG_SYS_RESET_ADDRESS;
#else
/*
* note: when CONFIG_SYS_MONITOR_BASE points to a RAM address,
* CONFIG_SYS_MONITOR_BASE - sizeof (ulong) is usually a valid address.
* Better pick an address known to be invalid on your system and assign
* it to CONFIG_SYS_RESET_ADDRESS.
* "(ulong)-1" used to be a good choice for many systems...
*/
addr = CONFIG_SYS_MONITOR_BASE - sizeof(ulong);
#endif
((void (*)(void)) addr)();
return 1;
}
/* ------------------------------------------------------------------------- */
/*
* Get timebase clock frequency (like cpu_clk in Hz)
*
* See sections 14.2 and 14.6 of the User's Manual
*/
unsigned long get_tbclk(void)
{
immap_t __iomem *immap = (immap_t __iomem *)CONFIG_SYS_IMMR;
ulong oscclk, factor, pll;
if (in_be32(&immap->im_clkrst.car_sccr) & SCCR_TBS)
return gd->cpu_clk / 16;
pll = in_be32(&immap->im_clkrst.car_plprcr);
#define PLPRCR_val(a) ((pll & PLPRCR_ ## a ## _MSK) >> PLPRCR_ ## a ## _SHIFT)
/*
* For newer PQ1 chips (MPC866/87x/88x families), PLL multiplication
* factor is calculated as follows:
*
* MFN
* MFI + -------
* MFD + 1
* factor = -----------------
* (PDF + 1) * 2^S
*
*/
factor = (PLPRCR_val(MFI) + PLPRCR_val(MFN) / (PLPRCR_val(MFD) + 1)) /
(PLPRCR_val(PDF) + 1) / (1 << PLPRCR_val(S));
oscclk = gd->cpu_clk / factor;
if ((in_be32(&immap->im_clkrst.car_sccr) & SCCR_RTSEL) == 0 ||
factor > 2)
return oscclk / 4;
return oscclk / 16;
}
/*
* Initializes on-chip ethernet controllers.
* to override, implement board_eth_init()
*/
int cpu_eth_init(bd_t *bis)
{
#if defined(CONFIG_MPC8XX_FEC)
fec_initialize(bis);
#endif
return 0;
}