diff options
| author | Grant Likely <grant.likely@secretlab.ca> | 2007-10-21 20:52:02 +0400 |
|---|---|---|
| committer | Grant Likely <grant.likely@secretlab.ca> | 2007-10-21 20:52:02 +0400 |
| commit | c052a22e808fc1f9b78b9a2fe7065f2026815128 (patch) | |
| tree | 9006ac29826e6cbb729175a62cb505f542223c2a | |
| parent | 2fb59d623ad85dfdb8ce03a660051743f7361896 (diff) | |
| download | linux-c052a22e808fc1f9b78b9a2fe7065f2026815128.tar.xz | |
[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>
| -rw-r--r-- | arch/powerpc/sysdev/bestcomm/bestcomm.c | 9 | ||||
| -rw-r--r-- | include/asm-powerpc/mpc52xx.h | 5 |
2 files changed, 11 insertions, 3 deletions
diff --git a/arch/powerpc/sysdev/bestcomm/bestcomm.c b/arch/powerpc/sysdev/bestcomm/bestcomm.c index 48492a83e5a7..740ad73ce5cc 100644 --- a/arch/powerpc/sysdev/bestcomm/bestcomm.c +++ b/arch/powerpc/sysdev/bestcomm/bestcomm.c @@ -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); diff --git a/include/asm-powerpc/mpc52xx.h b/include/asm-powerpc/mpc52xx.h index 568135fe52ea..764d997b4cde 100644 --- a/include/asm-powerpc/mpc52xx.h +++ b/include/asm-powerpc/mpc52xx.h @@ -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 */ |