diff options
Diffstat (limited to 'arch/mips/sgi-ip22/ip22-mc.c')
| -rw-r--r-- | arch/mips/sgi-ip22/ip22-mc.c | 89 |
1 files changed, 59 insertions, 30 deletions
diff --git a/arch/mips/sgi-ip22/ip22-mc.c b/arch/mips/sgi-ip22/ip22-mc.c index b58bd522262..7cec0a4e527 100644 --- a/arch/mips/sgi-ip22/ip22-mc.c +++ b/arch/mips/sgi-ip22/ip22-mc.c @@ -1,9 +1,10 @@ /* * ip22-mc.c: Routines for manipulating SGI Memory Controller. * - * Copyright (C) 1996 David S. Miller (dm@engr.sgi.com) + * Copyright (C) 1996 David S. Miller (davem@davemloft.net) * Copyright (C) 1999 Andrew R. Baker (andrewb@uab.edu) - Indigo2 changes * Copyright (C) 2003 Ladislav Michl (ladis@linux-mips.org) + * Copyright (C) 2004 Peter Fuerst (pf@net.alphadv.de) - IP28 */ #include <linux/init.h> @@ -47,7 +48,7 @@ struct mem { /* * Detect installed memory, do some sanity checks and notify kernel about it */ -static void probe_memory(void) +static void __init probe_memory(void) { int i, j, found, cnt = 0; struct mem bank[4]; @@ -120,30 +121,33 @@ void __init sgimc_init(void) */ /* Step 0: Make sure we turn off the watchdog in case it's - * still running (which might be the case after a - * soft reboot). + * still running (which might be the case after a + * soft reboot). */ tmp = sgimc->cpuctrl0; tmp &= ~SGIMC_CCTRL0_WDOG; sgimc->cpuctrl0 = tmp; /* Step 1: The CPU/GIO error status registers will not latch - * up a new error status until the register has been - * cleared by the cpu. These status registers are - * cleared by writing any value to them. + * up a new error status until the register has been + * cleared by the cpu. These status registers are + * cleared by writing any value to them. */ sgimc->cstat = sgimc->gstat = 0; /* Step 2: Enable all parity checking in cpu control register - * zero. + * zero. */ + /* don't touch parity settings for IP28 */ tmp = sgimc->cpuctrl0; - tmp |= (SGIMC_CCTRL0_EPERRGIO | SGIMC_CCTRL0_EPERRMEM | - SGIMC_CCTRL0_R4KNOCHKPARR); +#ifndef CONFIG_SGI_IP28 + tmp |= SGIMC_CCTRL0_EPERRGIO | SGIMC_CCTRL0_EPERRMEM; +#endif + tmp |= SGIMC_CCTRL0_R4KNOCHKPARR; sgimc->cpuctrl0 = tmp; /* Step 3: Setup the MC write buffer depth, this is controlled - * in cpu control register 1 in the lower 4 bits. + * in cpu control register 1 in the lower 4 bits. */ tmp = sgimc->cpuctrl1; tmp &= ~0xf; @@ -151,30 +155,31 @@ void __init sgimc_init(void) sgimc->cpuctrl1 = tmp; /* Step 4: Initialize the RPSS divider register to run as fast - * as it can correctly operate. The register is laid - * out as follows: + * as it can correctly operate. The register is laid + * out as follows: * - * ---------------------------------------- - * | RESERVED | INCREMENT | DIVIDER | - * ---------------------------------------- - * 31 16 15 8 7 0 + * ---------------------------------------- + * | RESERVED | INCREMENT | DIVIDER | + * ---------------------------------------- + * 31 16 15 8 7 0 * - * DIVIDER determines how often a 'tick' happens, - * INCREMENT determines by how the RPSS increment - * registers value increases at each 'tick'. Thus, - * for IP22 we get INCREMENT=1, DIVIDER=1 == 0x101 + * DIVIDER determines how often a 'tick' happens, + * INCREMENT determines by how the RPSS increment + * registers value increases at each 'tick'. Thus, + * for IP22 we get INCREMENT=1, DIVIDER=1 == 0x101 */ sgimc->divider = 0x101; /* Step 5: Initialize GIO64 arbitrator configuration register. * * NOTE: HPC init code in sgihpc_init() must run before us because - * we need to know Guiness vs. FullHouse and the board - * revision on this machine. You have been warned. + * we need to know Guiness vs. FullHouse and the board + * revision on this machine. You have been warned. */ /* First the basic invariants across all GIO64 implementations. */ - tmp = SGIMC_GIOPAR_HPC64; /* All 1st HPC's interface at 64bits */ + tmp = sgimc->giopar & SGIMC_GIOPAR_GFX64; /* keep gfx 64bit settings */ + tmp |= SGIMC_GIOPAR_HPC64; /* All 1st HPC's interface at 64bits */ tmp |= SGIMC_GIOPAR_ONEBUS; /* Only one physical GIO bus exists */ if (ip22_is_fullhouse()) { @@ -182,19 +187,18 @@ void __init sgimc_init(void) if (SGIOC_SYSID_BOARDREV(sgioc->sysid) < 2) { tmp |= SGIMC_GIOPAR_HPC264; /* 2nd HPC at 64bits */ tmp |= SGIMC_GIOPAR_PLINEEXP0; /* exp0 pipelines */ - tmp |= SGIMC_GIOPAR_MASTEREXP1; /* exp1 masters */ + tmp |= SGIMC_GIOPAR_MASTEREXP1; /* exp1 masters */ tmp |= SGIMC_GIOPAR_RTIMEEXP0; /* exp0 is realtime */ } else { tmp |= SGIMC_GIOPAR_HPC264; /* 2nd HPC 64bits */ tmp |= SGIMC_GIOPAR_PLINEEXP0; /* exp[01] pipelined */ tmp |= SGIMC_GIOPAR_PLINEEXP1; - tmp |= SGIMC_GIOPAR_MASTEREISA; /* EISA masters */ - tmp |= SGIMC_GIOPAR_GFX64; /* GFX at 64 bits */ + tmp |= SGIMC_GIOPAR_MASTEREISA; /* EISA masters */ } } else { /* Guiness specific settings. */ tmp |= SGIMC_GIOPAR_EISA64; /* MC talks to EISA at 64bits */ - tmp |= SGIMC_GIOPAR_MASTEREISA; /* EISA bus can act as master */ + tmp |= SGIMC_GIOPAR_MASTEREISA; /* EISA bus can act as master */ } sgimc->giopar = tmp; /* poof */ @@ -202,7 +206,32 @@ void __init sgimc_init(void) } void __init prom_meminit(void) {} -unsigned long __init prom_free_prom_memory(void) +void __init prom_free_prom_memory(void) { - return 0; +#ifdef CONFIG_SGI_IP28 + u32 mconfig1; + unsigned long flags; + spinlock_t lock; + + /* + * because ARCS accesses memory uncached we wait until ARCS + * isn't needed any longer, before we switch from slow to + * normal mode + */ + spin_lock_irqsave(&lock, flags); + mconfig1 = sgimc->mconfig1; + /* map ECC register */ + sgimc->mconfig1 = (mconfig1 & 0xffff0000) | 0x2060; + iob(); + /* switch to normal mode */ + *(unsigned long *)PHYS_TO_XKSEG_UNCACHED(0x60000000) = 0; + iob(); + /* reduce WR_COL */ + sgimc->cmacc = (sgimc->cmacc & ~0xf) | 4; + iob(); + /* restore old config */ + sgimc->mconfig1 = mconfig1; + iob(); + spin_unlock_irqrestore(&lock, flags); +#endif } |