Loading...
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (C) 2006 Chris Dearman (chris@mips.com),
4 */
5#include <linux/init.h>
6#include <linux/kernel.h>
7#include <linux/sched.h>
8#include <linux/mm.h>
9
10#include <asm/cpu-type.h>
11#include <asm/mipsregs.h>
12#include <asm/bcache.h>
13#include <asm/cacheops.h>
14#include <asm/page.h>
15#include <asm/pgtable.h>
16#include <asm/mmu_context.h>
17#include <asm/r4kcache.h>
18#include <asm/mips-cps.h>
19#include <asm/bootinfo.h>
20
21/*
22 * MIPS32/MIPS64 L2 cache handling
23 */
24
25/*
26 * Writeback and invalidate the secondary cache before DMA.
27 */
28static void mips_sc_wback_inv(unsigned long addr, unsigned long size)
29{
30 blast_scache_range(addr, addr + size);
31}
32
33/*
34 * Invalidate the secondary cache before DMA.
35 */
36static void mips_sc_inv(unsigned long addr, unsigned long size)
37{
38 unsigned long lsize = cpu_scache_line_size();
39 unsigned long almask = ~(lsize - 1);
40
41 cache_op(Hit_Writeback_Inv_SD, addr & almask);
42 cache_op(Hit_Writeback_Inv_SD, (addr + size - 1) & almask);
43 blast_inv_scache_range(addr, addr + size);
44}
45
46static void mips_sc_enable(void)
47{
48 /* L2 cache is permanently enabled */
49}
50
51static void mips_sc_disable(void)
52{
53 /* L2 cache is permanently enabled */
54}
55
56static void mips_sc_prefetch_enable(void)
57{
58 unsigned long pftctl;
59
60 if (mips_cm_revision() < CM_REV_CM2_5)
61 return;
62
63 /*
64 * If there is one or more L2 prefetch unit present then enable
65 * prefetching for both code & data, for all ports.
66 */
67 pftctl = read_gcr_l2_pft_control();
68 if (pftctl & CM_GCR_L2_PFT_CONTROL_NPFT) {
69 pftctl &= ~CM_GCR_L2_PFT_CONTROL_PAGEMASK;
70 pftctl |= PAGE_MASK & CM_GCR_L2_PFT_CONTROL_PAGEMASK;
71 pftctl |= CM_GCR_L2_PFT_CONTROL_PFTEN;
72 write_gcr_l2_pft_control(pftctl);
73
74 set_gcr_l2_pft_control_b(CM_GCR_L2_PFT_CONTROL_B_PORTID |
75 CM_GCR_L2_PFT_CONTROL_B_CEN);
76 }
77}
78
79static void mips_sc_prefetch_disable(void)
80{
81 if (mips_cm_revision() < CM_REV_CM2_5)
82 return;
83
84 clear_gcr_l2_pft_control(CM_GCR_L2_PFT_CONTROL_PFTEN);
85 clear_gcr_l2_pft_control_b(CM_GCR_L2_PFT_CONTROL_B_PORTID |
86 CM_GCR_L2_PFT_CONTROL_B_CEN);
87}
88
89static bool mips_sc_prefetch_is_enabled(void)
90{
91 unsigned long pftctl;
92
93 if (mips_cm_revision() < CM_REV_CM2_5)
94 return false;
95
96 pftctl = read_gcr_l2_pft_control();
97 if (!(pftctl & CM_GCR_L2_PFT_CONTROL_NPFT))
98 return false;
99 return !!(pftctl & CM_GCR_L2_PFT_CONTROL_PFTEN);
100}
101
102static struct bcache_ops mips_sc_ops = {
103 .bc_enable = mips_sc_enable,
104 .bc_disable = mips_sc_disable,
105 .bc_wback_inv = mips_sc_wback_inv,
106 .bc_inv = mips_sc_inv,
107 .bc_prefetch_enable = mips_sc_prefetch_enable,
108 .bc_prefetch_disable = mips_sc_prefetch_disable,
109 .bc_prefetch_is_enabled = mips_sc_prefetch_is_enabled,
110};
111
112/*
113 * Check if the L2 cache controller is activated on a particular platform.
114 * MTI's L2 controller and the L2 cache controller of Broadcom's BMIPS
115 * cores both use c0_config2's bit 12 as "L2 Bypass" bit, that is the
116 * cache being disabled. However there is no guarantee for this to be
117 * true on all platforms. In an act of stupidity the spec defined bits
118 * 12..15 as implementation defined so below function will eventually have
119 * to be replaced by a platform specific probe.
120 */
121static inline int mips_sc_is_activated(struct cpuinfo_mips *c)
122{
123 unsigned int config2 = read_c0_config2();
124 unsigned int tmp;
125
126 /* Check the bypass bit (L2B) */
127 switch (current_cpu_type()) {
128 case CPU_34K:
129 case CPU_74K:
130 case CPU_1004K:
131 case CPU_1074K:
132 case CPU_INTERAPTIV:
133 case CPU_PROAPTIV:
134 case CPU_P5600:
135 case CPU_BMIPS5000:
136 case CPU_QEMU_GENERIC:
137 case CPU_P6600:
138 if (config2 & (1 << 12))
139 return 0;
140 }
141
142 tmp = (config2 >> 4) & 0x0f;
143 if (0 < tmp && tmp <= 7)
144 c->scache.linesz = 2 << tmp;
145 else
146 return 0;
147 return 1;
148}
149
150static int __init mips_sc_probe_cm3(void)
151{
152 struct cpuinfo_mips *c = ¤t_cpu_data;
153 unsigned long cfg = read_gcr_l2_config();
154 unsigned long sets, line_sz, assoc;
155
156 if (cfg & CM_GCR_L2_CONFIG_BYPASS)
157 return 0;
158
159 sets = cfg & CM_GCR_L2_CONFIG_SET_SIZE;
160 sets >>= __ffs(CM_GCR_L2_CONFIG_SET_SIZE);
161 if (sets)
162 c->scache.sets = 64 << sets;
163
164 line_sz = cfg & CM_GCR_L2_CONFIG_LINE_SIZE;
165 line_sz >>= __ffs(CM_GCR_L2_CONFIG_LINE_SIZE);
166 if (line_sz)
167 c->scache.linesz = 2 << line_sz;
168
169 assoc = cfg & CM_GCR_L2_CONFIG_ASSOC;
170 assoc >>= __ffs(CM_GCR_L2_CONFIG_ASSOC);
171 c->scache.ways = assoc + 1;
172 c->scache.waysize = c->scache.sets * c->scache.linesz;
173 c->scache.waybit = __ffs(c->scache.waysize);
174
175 if (c->scache.linesz) {
176 c->scache.flags &= ~MIPS_CACHE_NOT_PRESENT;
177 c->options |= MIPS_CPU_INCLUSIVE_CACHES;
178 return 1;
179 }
180
181 return 0;
182}
183
184static inline int __init mips_sc_probe(void)
185{
186 struct cpuinfo_mips *c = ¤t_cpu_data;
187 unsigned int config1, config2;
188 unsigned int tmp;
189
190 /* Mark as not present until probe completed */
191 c->scache.flags |= MIPS_CACHE_NOT_PRESENT;
192
193 if (mips_cm_revision() >= CM_REV_CM3)
194 return mips_sc_probe_cm3();
195
196 /* Ignore anything but MIPSxx processors */
197 if (!(c->isa_level & (MIPS_CPU_ISA_M32R1 | MIPS_CPU_ISA_M32R2 |
198 MIPS_CPU_ISA_M32R6 | MIPS_CPU_ISA_M64R1 |
199 MIPS_CPU_ISA_M64R2 | MIPS_CPU_ISA_M64R6)))
200 return 0;
201
202 /* Does this MIPS32/MIPS64 CPU have a config2 register? */
203 config1 = read_c0_config1();
204 if (!(config1 & MIPS_CONF_M))
205 return 0;
206
207 config2 = read_c0_config2();
208
209 if (!mips_sc_is_activated(c))
210 return 0;
211
212 tmp = (config2 >> 8) & 0x0f;
213 if (tmp <= 7)
214 c->scache.sets = 64 << tmp;
215 else
216 return 0;
217
218 tmp = (config2 >> 0) & 0x0f;
219 if (tmp <= 7)
220 c->scache.ways = tmp + 1;
221 else
222 return 0;
223
224 /*
225 * According to config2 it would be 5-ways, but that is contradicted
226 * by all documentation.
227 */
228 if (current_cpu_type() == CPU_JZRISC &&
229 mips_machtype == MACH_INGENIC_JZ4770)
230 c->scache.ways = 4;
231
232 c->scache.waysize = c->scache.sets * c->scache.linesz;
233 c->scache.waybit = __ffs(c->scache.waysize);
234
235 c->scache.flags &= ~MIPS_CACHE_NOT_PRESENT;
236
237 return 1;
238}
239
240int mips_sc_init(void)
241{
242 int found = mips_sc_probe();
243 if (found) {
244 mips_sc_enable();
245 mips_sc_prefetch_enable();
246 bcops = &mips_sc_ops;
247 }
248 return found;
249}
1/*
2 * Copyright (C) 2006 Chris Dearman (chris@mips.com),
3 */
4#include <linux/init.h>
5#include <linux/kernel.h>
6#include <linux/sched.h>
7#include <linux/mm.h>
8
9#include <asm/cpu-type.h>
10#include <asm/mipsregs.h>
11#include <asm/bcache.h>
12#include <asm/cacheops.h>
13#include <asm/page.h>
14#include <asm/pgtable.h>
15#include <asm/mmu_context.h>
16#include <asm/r4kcache.h>
17
18/*
19 * MIPS32/MIPS64 L2 cache handling
20 */
21
22/*
23 * Writeback and invalidate the secondary cache before DMA.
24 */
25static void mips_sc_wback_inv(unsigned long addr, unsigned long size)
26{
27 blast_scache_range(addr, addr + size);
28}
29
30/*
31 * Invalidate the secondary cache before DMA.
32 */
33static void mips_sc_inv(unsigned long addr, unsigned long size)
34{
35 unsigned long lsize = cpu_scache_line_size();
36 unsigned long almask = ~(lsize - 1);
37
38 cache_op(Hit_Writeback_Inv_SD, addr & almask);
39 cache_op(Hit_Writeback_Inv_SD, (addr + size - 1) & almask);
40 blast_inv_scache_range(addr, addr + size);
41}
42
43static void mips_sc_enable(void)
44{
45 /* L2 cache is permanently enabled */
46}
47
48static void mips_sc_disable(void)
49{
50 /* L2 cache is permanently enabled */
51}
52
53static struct bcache_ops mips_sc_ops = {
54 .bc_enable = mips_sc_enable,
55 .bc_disable = mips_sc_disable,
56 .bc_wback_inv = mips_sc_wback_inv,
57 .bc_inv = mips_sc_inv
58};
59
60/*
61 * Check if the L2 cache controller is activated on a particular platform.
62 * MTI's L2 controller and the L2 cache controller of Broadcom's BMIPS
63 * cores both use c0_config2's bit 12 as "L2 Bypass" bit, that is the
64 * cache being disabled. However there is no guarantee for this to be
65 * true on all platforms. In an act of stupidity the spec defined bits
66 * 12..15 as implementation defined so below function will eventually have
67 * to be replaced by a platform specific probe.
68 */
69static inline int mips_sc_is_activated(struct cpuinfo_mips *c)
70{
71 unsigned int config2 = read_c0_config2();
72 unsigned int tmp;
73
74 /* Check the bypass bit (L2B) */
75 switch (current_cpu_type()) {
76 case CPU_34K:
77 case CPU_74K:
78 case CPU_1004K:
79 case CPU_1074K:
80 case CPU_INTERAPTIV:
81 case CPU_PROAPTIV:
82 case CPU_P5600:
83 case CPU_BMIPS5000:
84 if (config2 & (1 << 12))
85 return 0;
86 }
87
88 tmp = (config2 >> 4) & 0x0f;
89 if (0 < tmp && tmp <= 7)
90 c->scache.linesz = 2 << tmp;
91 else
92 return 0;
93 return 1;
94}
95
96static inline int __init mips_sc_probe(void)
97{
98 struct cpuinfo_mips *c = ¤t_cpu_data;
99 unsigned int config1, config2;
100 unsigned int tmp;
101
102 /* Mark as not present until probe completed */
103 c->scache.flags |= MIPS_CACHE_NOT_PRESENT;
104
105 /* Ignore anything but MIPSxx processors */
106 if (!(c->isa_level & (MIPS_CPU_ISA_M32R1 | MIPS_CPU_ISA_M32R2 |
107 MIPS_CPU_ISA_M64R1 | MIPS_CPU_ISA_M64R2)))
108 return 0;
109
110 /* Does this MIPS32/MIPS64 CPU have a config2 register? */
111 config1 = read_c0_config1();
112 if (!(config1 & MIPS_CONF_M))
113 return 0;
114
115 config2 = read_c0_config2();
116
117 if (!mips_sc_is_activated(c))
118 return 0;
119
120 tmp = (config2 >> 8) & 0x0f;
121 if (0 <= tmp && tmp <= 7)
122 c->scache.sets = 64 << tmp;
123 else
124 return 0;
125
126 tmp = (config2 >> 0) & 0x0f;
127 if (0 <= tmp && tmp <= 7)
128 c->scache.ways = tmp + 1;
129 else
130 return 0;
131
132 c->scache.waysize = c->scache.sets * c->scache.linesz;
133 c->scache.waybit = __ffs(c->scache.waysize);
134
135 c->scache.flags &= ~MIPS_CACHE_NOT_PRESENT;
136
137 return 1;
138}
139
140int mips_sc_init(void)
141{
142 int found = mips_sc_probe();
143 if (found) {
144 mips_sc_enable();
145 bcops = &mips_sc_ops;
146 }
147 return found;
148}