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git.ipfire.org Git - people/ms/u-boot.git/blob - cpu/mpc824x/cpu.c
2 * (C) Copyright 2000 - 2002
3 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
5 * See file CREDITS for list of people who contributed to this
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation; either version 2 of
11 * the License, or (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
29 DECLARE_GLOBAL_DATA_PTR
;
33 unsigned int pvr
= get_pvr ();
34 unsigned int version
= pvr
>> 16;
35 unsigned char revision
;
36 ulong clock
= gd
->cpu_clk
;
51 return -1; /*not valid for this source */
54 CONFIG_READ_BYTE (REVID
, revision
);
57 printf (" Revision %d.%d",
58 (revision
& 0xf0) >> 4,
61 return -1; /* no valid CPU revision info */
64 printf (" at %s MHz:", strmhz (buf
, clock
));
66 printf (" %u kB I-Cache", checkicache () >> 10);
67 printf (" %u kB D-Cache", checkdcache () >> 10);
74 /* ------------------------------------------------------------------------- */
77 int checkicache (void)
83 /* ------------------------------------------------------------------------- */
86 int checkdcache (void)
93 /*------------------------------------------------------------------- */
95 int do_reset (cmd_tbl_t
*cmdtp
, int flag
, int argc
, char *argv
[])
99 /* Interrupts and MMU off */
100 __asm__ ("mtspr 81, 0");
102 /* Interrupts and MMU off */
103 __asm__
__volatile__ ("mfmsr %0":"=r" (msr
):);
106 __asm__
__volatile__ ("mtmsr %0"::"r" (msr
));
109 * Trying to execute the next instruction at a non-existing address
110 * should cause a machine check, resulting in reset
112 #ifdef CONFIG_SYS_RESET_ADDRESS
113 addr
= CONFIG_SYS_RESET_ADDRESS
;
116 * note: when CONFIG_SYS_MONITOR_BASE points to a RAM address,
117 * CONFIG_SYS_MONITOR_BASE - sizeof (ulong) is usually a valid
118 * address. Better pick an address known to be invalid on
119 * your system and assign it to CONFIG_SYS_RESET_ADDRESS.
120 * "(ulong)-1" used to be a good choice for many systems...
122 addr
= CONFIG_SYS_MONITOR_BASE
- sizeof (ulong
);
124 ((void (*)(void)) addr
) ();
129 /* ------------------------------------------------------------------------- */
132 * Get timebase clock frequency (like cpu_clk in Hz)
133 * This is the sys_logic_clk (memory bus) divided by 4
135 unsigned long get_tbclk (void)
137 return ((get_bus_freq (0) + 2L) / 4L);
140 /* ------------------------------------------------------------------------- */
143 * The MPC824x has an integrated PCI controller known as the MPC107.
144 * The following are MPC107 Bridge Controller and PCI Support functions
149 * This procedure reads a 32-bit address MPC107 register, and returns
150 * a 32 bit value. It swaps the address to little endian before
151 * writing it to config address, and swaps the value to big endian
152 * before returning to the caller.
154 unsigned int mpc824x_mpc107_getreg (unsigned int regNum
)
158 /* swap the addr. to little endian */
159 *(volatile unsigned int *) CHRP_REG_ADDR
= PCISWAP (regNum
);
160 temp
= *(volatile unsigned int *) CHRP_REG_DATA
;
161 return PCISWAP (temp
); /* swap the data upon return */
165 * This procedure writes a 32-bit address MPC107 register. It swaps
166 * the address to little endian before writing it to config address.
169 void mpc824x_mpc107_setreg (unsigned int regNum
, unsigned int regVal
)
171 /* swap the addr. to little endian */
172 *(volatile unsigned int *) CHRP_REG_ADDR
= PCISWAP (regNum
);
173 *(volatile unsigned int *) CHRP_REG_DATA
= PCISWAP (regVal
);
179 * Write a byte (8 bits) to a memory location.
181 void mpc824x_mpc107_write8 (unsigned int addr
, unsigned char data
)
183 *(unsigned char *) addr
= data
;
188 * Write a word (16 bits) to a memory location after the value
189 * has been byte swapped (big to little endian or vice versa)
192 void mpc824x_mpc107_write16 (unsigned int address
, unsigned short data
)
194 *(volatile unsigned short *) address
= BYTE_SWAP_16_BIT (data
);
199 * Write a long word (32 bits) to a memory location after the value
200 * has been byte swapped (big to little endian or vice versa)
203 void mpc824x_mpc107_write32 (unsigned int address
, unsigned int data
)
205 *(volatile unsigned int *) address
= LONGSWAP (data
);
210 * Read a byte (8 bits) from a memory location.
212 unsigned char mpc824x_mpc107_read8 (unsigned int addr
)
214 return *(volatile unsigned char *) addr
;
219 * Read a word (16 bits) from a memory location, and byte swap the
220 * value before returning to the caller.
222 unsigned short mpc824x_mpc107_read16 (unsigned int address
)
224 unsigned short retVal
;
226 retVal
= BYTE_SWAP_16_BIT (*(unsigned short *) address
);
232 * Read a long word (32 bits) from a memory location, and byte
233 * swap the value before returning to the caller.
235 unsigned int mpc824x_mpc107_read32 (unsigned int address
)
239 retVal
= LONGSWAP (*(unsigned int *) address
);
245 * Read a register in the Embedded Utilities Memory Block address
247 * Input: regNum - register number + utility base address. Example,
248 * the base address of EPIC is 0x40000, the register number
249 * being passed is 0x40000+the address of the target register.
250 * (See epic.h for register addresses).
251 * Output: The 32 bit little endian value of the register.
254 unsigned int mpc824x_eummbar_read (unsigned int regNum
)
258 temp
= *(volatile unsigned int *) (EUMBBAR_VAL
+ regNum
);
259 temp
= PCISWAP (temp
);
265 * Write a value to a register in the Embedded Utilities Memory
266 * Block address space.
267 * Input: regNum - register number + utility base address. Example,
268 * the base address of EPIC is 0x40000, the register
269 * number is 0x40000+the address of the target register.
270 * (See epic.h for register addresses).
271 * regVal - value to be written to the register.
274 void mpc824x_eummbar_write (unsigned int regNum
, unsigned int regVal
)
276 *(volatile unsigned int *) (EUMBBAR_VAL
+ regNum
) = PCISWAP (regVal
);
280 /* ------------------------------------------------------------------------- */