diff options
Diffstat (limited to 'arch/mips/sgi-ip22/ip22-mc.c')
| -rw-r--r-- | arch/mips/sgi-ip22/ip22-mc.c | 237 |
1 files changed, 237 insertions, 0 deletions
diff --git a/arch/mips/sgi-ip22/ip22-mc.c b/arch/mips/sgi-ip22/ip22-mc.c new file mode 100644 index 000000000..1944d4150 --- /dev/null +++ b/arch/mips/sgi-ip22/ip22-mc.c @@ -0,0 +1,237 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * ip22-mc.c: Routines for manipulating SGI Memory Controller. + * + * 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> +#include <linux/export.h> +#include <linux/kernel.h> +#include <linux/spinlock.h> + +#include <asm/io.h> +#include <asm/bootinfo.h> +#include <asm/sgialib.h> +#include <asm/sgi/mc.h> +#include <asm/sgi/hpc3.h> +#include <asm/sgi/ip22.h> + +struct sgimc_regs *sgimc; + +EXPORT_SYMBOL(sgimc); + +static inline unsigned long get_bank_addr(unsigned int memconfig) +{ + return (memconfig & SGIMC_MCONFIG_BASEADDR) << ((sgimc->systemid & SGIMC_SYSID_MASKREV) >= 5 ? 24 : 22); +} + +static inline unsigned long get_bank_size(unsigned int memconfig) +{ + return ((memconfig & SGIMC_MCONFIG_RMASK) + 0x0100) << ((sgimc->systemid & SGIMC_SYSID_MASKREV) >= 5 ? 16 : 14); +} + +static inline unsigned int get_bank_config(int bank) +{ + unsigned int res = bank > 1 ? sgimc->mconfig1 : sgimc->mconfig0; + return bank % 2 ? res & 0xffff : res >> 16; +} + +struct mem { + unsigned long addr; + unsigned long size; +}; + +/* + * Detect installed memory, do some sanity checks and notify kernel about it + */ +static void __init probe_memory(void) +{ + int i, j, found, cnt = 0; + struct mem bank[4]; + struct mem space[2] = {{SGIMC_SEG0_BADDR, 0}, {SGIMC_SEG1_BADDR, 0}}; + + printk(KERN_INFO "MC: Probing memory configuration:\n"); + for (i = 0; i < ARRAY_SIZE(bank); i++) { + unsigned int tmp = get_bank_config(i); + if (!(tmp & SGIMC_MCONFIG_BVALID)) + continue; + + bank[cnt].size = get_bank_size(tmp); + bank[cnt].addr = get_bank_addr(tmp); + printk(KERN_INFO " bank%d: %3ldM @ %08lx\n", + i, bank[cnt].size / 1024 / 1024, bank[cnt].addr); + cnt++; + } + + /* And you thought bubble sort is dead algorithm... */ + do { + unsigned long addr, size; + + found = 0; + for (i = 1; i < cnt; i++) + if (bank[i-1].addr > bank[i].addr) { + addr = bank[i].addr; + size = bank[i].size; + bank[i].addr = bank[i-1].addr; + bank[i].size = bank[i-1].size; + bank[i-1].addr = addr; + bank[i-1].size = size; + found = 1; + } + } while (found); + + /* Figure out how are memory banks mapped into spaces */ + for (i = 0; i < cnt; i++) { + found = 0; + for (j = 0; j < ARRAY_SIZE(space) && !found; j++) + if (space[j].addr + space[j].size == bank[i].addr) { + space[j].size += bank[i].size; + found = 1; + } + /* There is either hole or overlapping memory */ + if (!found) + printk(KERN_CRIT "MC: Memory configuration mismatch " + "(%08lx), expect Bus Error soon\n", + bank[i].addr); + } + + for (i = 0; i < ARRAY_SIZE(space); i++) + if (space[i].size) + add_memory_region(space[i].addr, space[i].size, + BOOT_MEM_RAM); +} + +void __init sgimc_init(void) +{ + u32 tmp; + + /* ioremap can't fail */ + sgimc = (struct sgimc_regs *) + ioremap(SGIMC_BASE, sizeof(struct sgimc_regs)); + + printk(KERN_INFO "MC: SGI memory controller Revision %d\n", + (int) sgimc->systemid & SGIMC_SYSID_MASKREV); + + /* Place the MC into a known state. This must be done before + * interrupts are first enabled etc. + */ + + /* Step 0: Make sure we turn off the watchdog in case it's + * 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. + */ + sgimc->cstat = sgimc->gstat = 0; + + /* Step 2: Enable all parity checking in cpu control register + * zero. + */ + /* don't touch parity settings for IP28 */ + tmp = sgimc->cpuctrl0; +#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. + */ + tmp = sgimc->cpuctrl1; + tmp &= ~0xf; + tmp |= 0xd; + 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: + * + * ---------------------------------------- + * | 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 + */ + 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. + */ + + /* First the basic invariants across all GIO64 implementations. */ + 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()) { + /* Fullhouse specific settings. */ + 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_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 */ + } + } else { + /* Guiness specific settings. */ + tmp |= SGIMC_GIOPAR_EISA64; /* MC talks to EISA at 64bits */ + tmp |= SGIMC_GIOPAR_MASTEREISA; /* EISA bus can act as master */ + } + sgimc->giopar = tmp; /* poof */ + + probe_memory(); +} + +void __init prom_meminit(void) {} +void __init prom_free_prom_memory(void) +{ +#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 +} |