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[platform/kernel/linux-rpi.git] / drivers / iommu / arm / arm-smmu / arm-smmu-impl.c
1 // SPDX-License-Identifier: GPL-2.0-only
2 // Miscellaneous Arm SMMU implementation and integration quirks
3 // Copyright (C) 2019 Arm Limited
4
5 #define pr_fmt(fmt) "arm-smmu: " fmt
6
7 #include <linux/bitfield.h>
8 #include <linux/of.h>
9
10 #include "arm-smmu.h"
11
12
13 static int arm_smmu_gr0_ns(int offset)
14 {
15         switch (offset) {
16         case ARM_SMMU_GR0_sCR0:
17         case ARM_SMMU_GR0_sACR:
18         case ARM_SMMU_GR0_sGFSR:
19         case ARM_SMMU_GR0_sGFSYNR0:
20         case ARM_SMMU_GR0_sGFSYNR1:
21         case ARM_SMMU_GR0_sGFSYNR2:
22                 return offset + 0x400;
23         default:
24                 return offset;
25         }
26 }
27
28 static u32 arm_smmu_read_ns(struct arm_smmu_device *smmu, int page,
29                             int offset)
30 {
31         if (page == ARM_SMMU_GR0)
32                 offset = arm_smmu_gr0_ns(offset);
33         return readl_relaxed(arm_smmu_page(smmu, page) + offset);
34 }
35
36 static void arm_smmu_write_ns(struct arm_smmu_device *smmu, int page,
37                               int offset, u32 val)
38 {
39         if (page == ARM_SMMU_GR0)
40                 offset = arm_smmu_gr0_ns(offset);
41         writel_relaxed(val, arm_smmu_page(smmu, page) + offset);
42 }
43
44 /* Since we don't care for sGFAR, we can do without 64-bit accessors */
45 static const struct arm_smmu_impl calxeda_impl = {
46         .read_reg = arm_smmu_read_ns,
47         .write_reg = arm_smmu_write_ns,
48 };
49
50
51 struct cavium_smmu {
52         struct arm_smmu_device smmu;
53         u32 id_base;
54 };
55
56 static int cavium_cfg_probe(struct arm_smmu_device *smmu)
57 {
58         static atomic_t context_count = ATOMIC_INIT(0);
59         struct cavium_smmu *cs = container_of(smmu, struct cavium_smmu, smmu);
60         /*
61          * Cavium CN88xx erratum #27704.
62          * Ensure ASID and VMID allocation is unique across all SMMUs in
63          * the system.
64          */
65         cs->id_base = atomic_fetch_add(smmu->num_context_banks, &context_count);
66         dev_notice(smmu->dev, "\tenabling workaround for Cavium erratum 27704\n");
67
68         return 0;
69 }
70
71 static int cavium_init_context(struct arm_smmu_domain *smmu_domain,
72                 struct io_pgtable_cfg *pgtbl_cfg, struct device *dev)
73 {
74         struct cavium_smmu *cs = container_of(smmu_domain->smmu,
75                                               struct cavium_smmu, smmu);
76
77         if (smmu_domain->stage == ARM_SMMU_DOMAIN_S2)
78                 smmu_domain->cfg.vmid += cs->id_base;
79         else
80                 smmu_domain->cfg.asid += cs->id_base;
81
82         return 0;
83 }
84
85 static const struct arm_smmu_impl cavium_impl = {
86         .cfg_probe = cavium_cfg_probe,
87         .init_context = cavium_init_context,
88 };
89
90 static struct arm_smmu_device *cavium_smmu_impl_init(struct arm_smmu_device *smmu)
91 {
92         struct cavium_smmu *cs;
93
94         cs = devm_krealloc(smmu->dev, smmu, sizeof(*cs), GFP_KERNEL);
95         if (!cs)
96                 return ERR_PTR(-ENOMEM);
97
98         cs->smmu.impl = &cavium_impl;
99
100         return &cs->smmu;
101 }
102
103
104 #define ARM_MMU500_ACTLR_CPRE           (1 << 1)
105
106 #define ARM_MMU500_ACR_CACHE_LOCK       (1 << 26)
107 #define ARM_MMU500_ACR_S2CRB_TLBEN      (1 << 10)
108 #define ARM_MMU500_ACR_SMTNMB_TLBEN     (1 << 8)
109
110 int arm_mmu500_reset(struct arm_smmu_device *smmu)
111 {
112         u32 reg, major;
113         int i;
114         /*
115          * On MMU-500 r2p0 onwards we need to clear ACR.CACHE_LOCK before
116          * writes to the context bank ACTLRs will stick. And we just hope that
117          * Secure has also cleared SACR.CACHE_LOCK for this to take effect...
118          */
119         reg = arm_smmu_gr0_read(smmu, ARM_SMMU_GR0_ID7);
120         major = FIELD_GET(ARM_SMMU_ID7_MAJOR, reg);
121         reg = arm_smmu_gr0_read(smmu, ARM_SMMU_GR0_sACR);
122         if (major >= 2)
123                 reg &= ~ARM_MMU500_ACR_CACHE_LOCK;
124         /*
125          * Allow unmatched Stream IDs to allocate bypass
126          * TLB entries for reduced latency.
127          */
128         reg |= ARM_MMU500_ACR_SMTNMB_TLBEN | ARM_MMU500_ACR_S2CRB_TLBEN;
129         arm_smmu_gr0_write(smmu, ARM_SMMU_GR0_sACR, reg);
130
131         /*
132          * Disable MMU-500's not-particularly-beneficial next-page
133          * prefetcher for the sake of errata #841119 and #826419.
134          */
135         for (i = 0; i < smmu->num_context_banks; ++i) {
136                 reg = arm_smmu_cb_read(smmu, i, ARM_SMMU_CB_ACTLR);
137                 reg &= ~ARM_MMU500_ACTLR_CPRE;
138                 arm_smmu_cb_write(smmu, i, ARM_SMMU_CB_ACTLR, reg);
139         }
140
141         return 0;
142 }
143
144 static const struct arm_smmu_impl arm_mmu500_impl = {
145         .reset = arm_mmu500_reset,
146 };
147
148 static u64 mrvl_mmu500_readq(struct arm_smmu_device *smmu, int page, int off)
149 {
150         /*
151          * Marvell Armada-AP806 erratum #582743.
152          * Split all the readq to double readl
153          */
154         return hi_lo_readq_relaxed(arm_smmu_page(smmu, page) + off);
155 }
156
157 static void mrvl_mmu500_writeq(struct arm_smmu_device *smmu, int page, int off,
158                                u64 val)
159 {
160         /*
161          * Marvell Armada-AP806 erratum #582743.
162          * Split all the writeq to double writel
163          */
164         hi_lo_writeq_relaxed(val, arm_smmu_page(smmu, page) + off);
165 }
166
167 static int mrvl_mmu500_cfg_probe(struct arm_smmu_device *smmu)
168 {
169
170         /*
171          * Armada-AP806 erratum #582743.
172          * Hide the SMMU_IDR2.PTFSv8 fields to sidestep the AArch64
173          * formats altogether and allow using 32 bits access on the
174          * interconnect.
175          */
176         smmu->features &= ~(ARM_SMMU_FEAT_FMT_AARCH64_4K |
177                             ARM_SMMU_FEAT_FMT_AARCH64_16K |
178                             ARM_SMMU_FEAT_FMT_AARCH64_64K);
179
180         return 0;
181 }
182
183 static const struct arm_smmu_impl mrvl_mmu500_impl = {
184         .read_reg64 = mrvl_mmu500_readq,
185         .write_reg64 = mrvl_mmu500_writeq,
186         .cfg_probe = mrvl_mmu500_cfg_probe,
187         .reset = arm_mmu500_reset,
188 };
189
190
191 struct arm_smmu_device *arm_smmu_impl_init(struct arm_smmu_device *smmu)
192 {
193         const struct device_node *np = smmu->dev->of_node;
194
195         /*
196          * Set the impl for model-specific implementation quirks first,
197          * such that platform integration quirks can pick it up and
198          * inherit from it if necessary.
199          */
200         switch (smmu->model) {
201         case ARM_MMU500:
202                 smmu->impl = &arm_mmu500_impl;
203                 break;
204         case CAVIUM_SMMUV2:
205                 return cavium_smmu_impl_init(smmu);
206         default:
207                 break;
208         }
209
210         /* This is implicitly MMU-400 */
211         if (of_property_read_bool(np, "calxeda,smmu-secure-config-access"))
212                 smmu->impl = &calxeda_impl;
213
214         if (of_device_is_compatible(np, "nvidia,tegra194-smmu") ||
215             of_device_is_compatible(np, "nvidia,tegra186-smmu"))
216                 return nvidia_smmu_impl_init(smmu);
217
218         if (IS_ENABLED(CONFIG_ARM_SMMU_QCOM))
219                 smmu = qcom_smmu_impl_init(smmu);
220
221         if (of_device_is_compatible(np, "marvell,ap806-smmu-500"))
222                 smmu->impl = &mrvl_mmu500_impl;
223
224         return smmu;
225 }