1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* |
3 | * SGI IP30 miscellaneous setup bits. |
4 | * |
5 | * Copyright (C) 2004-2007 Stanislaw Skowronek <skylark@unaligned.org> |
6 | * 2007 Joshua Kinard <kumba@gentoo.org> |
7 | * 2009 Johannes Dickgreber <tanzy@gmx.de> |
8 | */ |
9 | |
10 | #include <linux/init.h> |
11 | #include <linux/io.h> |
12 | #include <linux/kernel.h> |
13 | #include <linux/types.h> |
14 | #include <linux/percpu.h> |
15 | #include <linux/memblock.h> |
16 | |
17 | #include <asm/bootinfo.h> |
18 | #include <asm/smp-ops.h> |
19 | #include <asm/sgialib.h> |
20 | #include <asm/time.h> |
21 | #include <asm/sgi/heart.h> |
22 | |
23 | #include "ip30-common.h" |
24 | |
25 | /* Structure of accessible HEART registers located in XKPHYS space. */ |
26 | struct ip30_heart_regs __iomem *heart_regs = HEART_XKPHYS_BASE; |
27 | |
28 | /* |
29 | * ARCS will report up to the first 1GB of |
30 | * memory if queried. Anything beyond that |
31 | * is marked as reserved. |
32 | */ |
33 | #define IP30_MAX_PROM_MEMORY _AC(0x40000000, UL) |
34 | |
35 | /* |
36 | * Memory in the Octane starts at 512MB |
37 | */ |
38 | #define IP30_MEMORY_BASE _AC(0x20000000, UL) |
39 | |
40 | /* |
41 | * If using ARCS to probe for memory, then |
42 | * remaining memory will start at this offset. |
43 | */ |
44 | #define IP30_REAL_MEMORY_START (IP30_MEMORY_BASE + IP30_MAX_PROM_MEMORY) |
45 | |
46 | #define MEM_SHIFT(x) ((x) >> 20) |
47 | |
48 | static void __init ip30_mem_init(void) |
49 | { |
50 | unsigned long total_mem; |
51 | phys_addr_t addr; |
52 | phys_addr_t size; |
53 | u32 memcfg; |
54 | int i; |
55 | |
56 | total_mem = 0; |
57 | for (i = 0; i < HEART_MEMORY_BANKS; i++) { |
58 | memcfg = __raw_readl(addr: &heart_regs->mem_cfg.l[i]); |
59 | if (!(memcfg & HEART_MEMCFG_VALID)) |
60 | continue; |
61 | |
62 | addr = memcfg & HEART_MEMCFG_ADDR_MASK; |
63 | addr <<= HEART_MEMCFG_UNIT_SHIFT; |
64 | addr += IP30_MEMORY_BASE; |
65 | size = memcfg & HEART_MEMCFG_SIZE_MASK; |
66 | size >>= HEART_MEMCFG_SIZE_SHIFT; |
67 | size += 1; |
68 | size <<= HEART_MEMCFG_UNIT_SHIFT; |
69 | |
70 | total_mem += size; |
71 | |
72 | if (addr >= IP30_REAL_MEMORY_START) |
73 | memblock_phys_free(base: addr, size); |
74 | else if ((addr + size) > IP30_REAL_MEMORY_START) |
75 | memblock_phys_free(IP30_REAL_MEMORY_START, |
76 | size: size - IP30_MAX_PROM_MEMORY); |
77 | } |
78 | pr_info("Detected %luMB of physical memory.\n" , MEM_SHIFT(total_mem)); |
79 | } |
80 | |
81 | /** |
82 | * ip30_cpu_time_init - platform time initialization. |
83 | */ |
84 | static void __init ip30_cpu_time_init(void) |
85 | { |
86 | int cpu = smp_processor_id(); |
87 | u64 heart_compare; |
88 | unsigned int start, end; |
89 | int time_diff; |
90 | |
91 | heart_compare = (heart_read(&heart_regs->count) + |
92 | (HEART_CYCLES_PER_SEC / 10)); |
93 | start = read_c0_count(); |
94 | while ((heart_read(&heart_regs->count) - heart_compare) & 0x800000) |
95 | cpu_relax(); |
96 | |
97 | end = read_c0_count(); |
98 | time_diff = (int)end - (int)start; |
99 | mips_hpt_frequency = time_diff * 10; |
100 | pr_info("IP30: CPU%d: %d MHz CPU detected.\n" , cpu, |
101 | (mips_hpt_frequency * 2) / 1000000); |
102 | } |
103 | |
104 | void __init ip30_per_cpu_init(void) |
105 | { |
106 | /* Disable all interrupts. */ |
107 | clear_c0_status(ST0_IM); |
108 | |
109 | ip30_cpu_time_init(); |
110 | #ifdef CONFIG_SMP |
111 | ip30_install_ipi(); |
112 | #endif |
113 | |
114 | enable_percpu_irq(IP30_HEART_L0_IRQ, IRQ_TYPE_NONE); |
115 | enable_percpu_irq(IP30_HEART_L1_IRQ, IRQ_TYPE_NONE); |
116 | enable_percpu_irq(IP30_HEART_L2_IRQ, IRQ_TYPE_NONE); |
117 | enable_percpu_irq(IP30_HEART_ERR_IRQ, IRQ_TYPE_NONE); |
118 | } |
119 | |
120 | /** |
121 | * plat_mem_setup - despite the name, misc setup happens here. |
122 | */ |
123 | void __init plat_mem_setup(void) |
124 | { |
125 | ip30_mem_init(); |
126 | |
127 | /* XXX: Hard lock on /sbin/init if this flag isn't specified. */ |
128 | prom_flags |= PROM_FLAG_DONT_FREE_TEMP; |
129 | |
130 | #ifdef CONFIG_SMP |
131 | register_smp_ops(&ip30_smp_ops); |
132 | #else |
133 | ip30_per_cpu_init(); |
134 | #endif |
135 | |
136 | ioport_resource.start = 0; |
137 | ioport_resource.end = ~0UL; |
138 | set_io_port_base(IO_BASE); |
139 | } |
140 | |