17505576dSThomas Bogendoerfer // SPDX-License-Identifier: GPL-2.0
27505576dSThomas Bogendoerfer /*
37505576dSThomas Bogendoerfer * SGI IP30 miscellaneous setup bits.
47505576dSThomas Bogendoerfer *
57505576dSThomas Bogendoerfer * Copyright (C) 2004-2007 Stanislaw Skowronek <skylark@unaligned.org>
67505576dSThomas Bogendoerfer * 2007 Joshua Kinard <kumba@gentoo.org>
77505576dSThomas Bogendoerfer * 2009 Johannes Dickgreber <tanzy@gmx.de>
87505576dSThomas Bogendoerfer */
97505576dSThomas Bogendoerfer
107505576dSThomas Bogendoerfer #include <linux/init.h>
117505576dSThomas Bogendoerfer #include <linux/io.h>
127505576dSThomas Bogendoerfer #include <linux/kernel.h>
137505576dSThomas Bogendoerfer #include <linux/types.h>
147505576dSThomas Bogendoerfer #include <linux/percpu.h>
157505576dSThomas Bogendoerfer #include <linux/memblock.h>
167505576dSThomas Bogendoerfer
177505576dSThomas Bogendoerfer #include <asm/smp-ops.h>
187505576dSThomas Bogendoerfer #include <asm/sgialib.h>
197505576dSThomas Bogendoerfer #include <asm/time.h>
207505576dSThomas Bogendoerfer #include <asm/sgi/heart.h>
217505576dSThomas Bogendoerfer
227505576dSThomas Bogendoerfer #include "ip30-common.h"
237505576dSThomas Bogendoerfer
247505576dSThomas Bogendoerfer /* Structure of accessible HEART registers located in XKPHYS space. */
257505576dSThomas Bogendoerfer struct ip30_heart_regs __iomem *heart_regs = HEART_XKPHYS_BASE;
267505576dSThomas Bogendoerfer
277505576dSThomas Bogendoerfer /*
287505576dSThomas Bogendoerfer * ARCS will report up to the first 1GB of
297505576dSThomas Bogendoerfer * memory if queried. Anything beyond that
307505576dSThomas Bogendoerfer * is marked as reserved.
317505576dSThomas Bogendoerfer */
327505576dSThomas Bogendoerfer #define IP30_MAX_PROM_MEMORY _AC(0x40000000, UL)
337505576dSThomas Bogendoerfer
347505576dSThomas Bogendoerfer /*
357505576dSThomas Bogendoerfer * Memory in the Octane starts at 512MB
367505576dSThomas Bogendoerfer */
377505576dSThomas Bogendoerfer #define IP30_MEMORY_BASE _AC(0x20000000, UL)
387505576dSThomas Bogendoerfer
397505576dSThomas Bogendoerfer /*
407505576dSThomas Bogendoerfer * If using ARCS to probe for memory, then
417505576dSThomas Bogendoerfer * remaining memory will start at this offset.
427505576dSThomas Bogendoerfer */
437505576dSThomas Bogendoerfer #define IP30_REAL_MEMORY_START (IP30_MEMORY_BASE + IP30_MAX_PROM_MEMORY)
447505576dSThomas Bogendoerfer
457505576dSThomas Bogendoerfer #define MEM_SHIFT(x) ((x) >> 20)
467505576dSThomas Bogendoerfer
ip30_mem_init(void)477505576dSThomas Bogendoerfer static void __init ip30_mem_init(void)
487505576dSThomas Bogendoerfer {
497505576dSThomas Bogendoerfer unsigned long total_mem;
507505576dSThomas Bogendoerfer phys_addr_t addr;
517505576dSThomas Bogendoerfer phys_addr_t size;
527505576dSThomas Bogendoerfer u32 memcfg;
537505576dSThomas Bogendoerfer int i;
547505576dSThomas Bogendoerfer
557505576dSThomas Bogendoerfer total_mem = 0;
567505576dSThomas Bogendoerfer for (i = 0; i < HEART_MEMORY_BANKS; i++) {
577505576dSThomas Bogendoerfer memcfg = __raw_readl(&heart_regs->mem_cfg.l[i]);
587505576dSThomas Bogendoerfer if (!(memcfg & HEART_MEMCFG_VALID))
597505576dSThomas Bogendoerfer continue;
607505576dSThomas Bogendoerfer
617505576dSThomas Bogendoerfer addr = memcfg & HEART_MEMCFG_ADDR_MASK;
627505576dSThomas Bogendoerfer addr <<= HEART_MEMCFG_UNIT_SHIFT;
637505576dSThomas Bogendoerfer addr += IP30_MEMORY_BASE;
647505576dSThomas Bogendoerfer size = memcfg & HEART_MEMCFG_SIZE_MASK;
657505576dSThomas Bogendoerfer size >>= HEART_MEMCFG_SIZE_SHIFT;
667505576dSThomas Bogendoerfer size += 1;
677505576dSThomas Bogendoerfer size <<= HEART_MEMCFG_UNIT_SHIFT;
687505576dSThomas Bogendoerfer
697505576dSThomas Bogendoerfer total_mem += size;
707505576dSThomas Bogendoerfer
717505576dSThomas Bogendoerfer if (addr >= IP30_REAL_MEMORY_START)
72*3ecc6834SMike Rapoport memblock_phys_free(addr, size);
737505576dSThomas Bogendoerfer else if ((addr + size) > IP30_REAL_MEMORY_START)
74*3ecc6834SMike Rapoport memblock_phys_free(IP30_REAL_MEMORY_START,
757505576dSThomas Bogendoerfer size - IP30_MAX_PROM_MEMORY);
767505576dSThomas Bogendoerfer }
777505576dSThomas Bogendoerfer pr_info("Detected %luMB of physical memory.\n", MEM_SHIFT(total_mem));
787505576dSThomas Bogendoerfer }
797505576dSThomas Bogendoerfer
807505576dSThomas Bogendoerfer /**
817505576dSThomas Bogendoerfer * ip30_cpu_time_init - platform time initialization.
827505576dSThomas Bogendoerfer */
ip30_cpu_time_init(void)837505576dSThomas Bogendoerfer static void __init ip30_cpu_time_init(void)
847505576dSThomas Bogendoerfer {
857505576dSThomas Bogendoerfer int cpu = smp_processor_id();
867505576dSThomas Bogendoerfer u64 heart_compare;
877505576dSThomas Bogendoerfer unsigned int start, end;
887505576dSThomas Bogendoerfer int time_diff;
897505576dSThomas Bogendoerfer
907505576dSThomas Bogendoerfer heart_compare = (heart_read(&heart_regs->count) +
917505576dSThomas Bogendoerfer (HEART_CYCLES_PER_SEC / 10));
927505576dSThomas Bogendoerfer start = read_c0_count();
937505576dSThomas Bogendoerfer while ((heart_read(&heart_regs->count) - heart_compare) & 0x800000)
947505576dSThomas Bogendoerfer cpu_relax();
957505576dSThomas Bogendoerfer
967505576dSThomas Bogendoerfer end = read_c0_count();
977505576dSThomas Bogendoerfer time_diff = (int)end - (int)start;
987505576dSThomas Bogendoerfer mips_hpt_frequency = time_diff * 10;
997505576dSThomas Bogendoerfer pr_info("IP30: CPU%d: %d MHz CPU detected.\n", cpu,
1007505576dSThomas Bogendoerfer (mips_hpt_frequency * 2) / 1000000);
1017505576dSThomas Bogendoerfer }
1027505576dSThomas Bogendoerfer
ip30_per_cpu_init(void)1037505576dSThomas Bogendoerfer void __init ip30_per_cpu_init(void)
1047505576dSThomas Bogendoerfer {
1057505576dSThomas Bogendoerfer /* Disable all interrupts. */
1067505576dSThomas Bogendoerfer clear_c0_status(ST0_IM);
1077505576dSThomas Bogendoerfer
1087505576dSThomas Bogendoerfer ip30_cpu_time_init();
1097505576dSThomas Bogendoerfer #ifdef CONFIG_SMP
1107505576dSThomas Bogendoerfer ip30_install_ipi();
1117505576dSThomas Bogendoerfer #endif
1127505576dSThomas Bogendoerfer
1137505576dSThomas Bogendoerfer enable_percpu_irq(IP30_HEART_L0_IRQ, IRQ_TYPE_NONE);
1147505576dSThomas Bogendoerfer enable_percpu_irq(IP30_HEART_L1_IRQ, IRQ_TYPE_NONE);
1157505576dSThomas Bogendoerfer enable_percpu_irq(IP30_HEART_L2_IRQ, IRQ_TYPE_NONE);
1167505576dSThomas Bogendoerfer enable_percpu_irq(IP30_HEART_ERR_IRQ, IRQ_TYPE_NONE);
1177505576dSThomas Bogendoerfer }
1187505576dSThomas Bogendoerfer
1197505576dSThomas Bogendoerfer /**
1207505576dSThomas Bogendoerfer * plat_mem_setup - despite the name, misc setup happens here.
1217505576dSThomas Bogendoerfer */
plat_mem_setup(void)1227505576dSThomas Bogendoerfer void __init plat_mem_setup(void)
1237505576dSThomas Bogendoerfer {
1247505576dSThomas Bogendoerfer ip30_mem_init();
1257505576dSThomas Bogendoerfer
1267505576dSThomas Bogendoerfer /* XXX: Hard lock on /sbin/init if this flag isn't specified. */
1277505576dSThomas Bogendoerfer prom_flags |= PROM_FLAG_DONT_FREE_TEMP;
1287505576dSThomas Bogendoerfer
1297505576dSThomas Bogendoerfer #ifdef CONFIG_SMP
1307505576dSThomas Bogendoerfer register_smp_ops(&ip30_smp_ops);
1317505576dSThomas Bogendoerfer #else
1327505576dSThomas Bogendoerfer ip30_per_cpu_init();
1337505576dSThomas Bogendoerfer #endif
1347505576dSThomas Bogendoerfer
1357505576dSThomas Bogendoerfer ioport_resource.start = 0;
1367505576dSThomas Bogendoerfer ioport_resource.end = ~0UL;
1377505576dSThomas Bogendoerfer set_io_port_base(IO_BASE);
1387505576dSThomas Bogendoerfer }
139