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[POWERPC] bestcomm: Restrict bus prefetch bugfix to original mpc5200 silicon. 

Only the MPC5200 needs this bug fix.  MPC5200B is okay.

Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
hifive-unleashed-5.1
Grant Likely 2007-10-21 10:52:02 -06:00
parent 2fb59d623a
commit c052a22e80
2 changed files with 11 additions and 3 deletions
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9
arch/powerpc/sysdev/bestcomm/bestcomm.c
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@ -269,6 +269,7 @@ bcom_engine_init(void)
int task;
phys_addr_t tdt_pa, ctx_pa, var_pa, fdt_pa;
unsigned int tdt_size, ctx_size, var_size, fdt_size;
u16 regval;
/* Allocate & clear SRAM zones for FDT, TDTs, contexts and vars/incs */
tdt_size = BCOM_MAX_TASKS * sizeof(struct bcom_tdt);
@ -319,9 +320,11 @@ bcom_engine_init(void)
/* Init 'always' initiator */
out_8(&bcom_eng->regs->ipr[BCOM_INITIATOR_ALWAYS], BCOM_IPR_ALWAYS);
/* Disable COMM Bus Prefetch, apparently it's not reliable yet */
/* FIXME: This should be done on 5200 and not 5200B ... */
out_be16(&bcom_eng->regs->PtdCntrl, in_be16(&bcom_eng->regs->PtdCntrl) | 1);
/* Disable COMM Bus Prefetch on the original 5200; it's broken */
if ((mfspr(SPRN_SVR) & MPC5200_SVR_MASK) == MPC5200_SVR) {
regval = in_be16(&bcom_eng->regs->PtdCntrl);
out_be16(&bcom_eng->regs->PtdCntrl, regval | 1);
}
/* Init lock */
spin_lock_init(&bcom_eng->lock);

5
include/asm-powerpc/mpc52xx.h
View File

@ -20,6 +20,11 @@
#include <linux/suspend.h>
/* Variants of the 5200(B) */
#define MPC5200_SVR 0x80110010
#define MPC5200_SVR_MASK 0xfffffff0
#define MPC5200B_SVR 0x80110020
#define MPC5200B_SVR_MASK 0xfffffff0
/* ======================================================================== */
/* Structures mapping of some unit register set */