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b0afd44b LW |
1 | /* |
2 | * Versatile OF physmap driver add-on | |
3 | * | |
4 | * Copyright (c) 2016, Linaro Limited | |
5 | * Author: Linus Walleij <linus.walleij@linaro.org> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU General Public License as | |
9 | * published by the Free Software Foundation; either version 2 of | |
10 | * the License, or (at your option) any later version. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program; if not, write to the Free Software | |
19 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, | |
20 | * MA 02111-1307 USA | |
21 | */ | |
c5f9d6b1 | 22 | #include <linux/export.h> |
b0afd44b LW |
23 | #include <linux/io.h> |
24 | #include <linux/of.h> | |
25 | #include <linux/of_address.h> | |
26 | #include <linux/of_device.h> | |
27 | #include <linux/mtd/map.h> | |
28 | #include <linux/mfd/syscon.h> | |
29 | #include <linux/regmap.h> | |
30 | #include <linux/bitops.h> | |
31 | #include "physmap_of_versatile.h" | |
32 | ||
33 | static struct regmap *syscon_regmap; | |
34 | ||
35 | enum versatile_flashprot { | |
36 | INTEGRATOR_AP_FLASHPROT, | |
37 | INTEGRATOR_CP_FLASHPROT, | |
38 | VERSATILE_FLASHPROT, | |
39 | REALVIEW_FLASHPROT, | |
40 | }; | |
41 | ||
42 | static const struct of_device_id syscon_match[] = { | |
43 | { | |
44 | .compatible = "arm,integrator-ap-syscon", | |
45 | .data = (void *)INTEGRATOR_AP_FLASHPROT, | |
46 | }, | |
47 | { | |
48 | .compatible = "arm,integrator-cp-syscon", | |
49 | .data = (void *)INTEGRATOR_CP_FLASHPROT, | |
50 | }, | |
51 | { | |
52 | .compatible = "arm,core-module-versatile", | |
53 | .data = (void *)VERSATILE_FLASHPROT, | |
54 | }, | |
55 | { | |
56 | .compatible = "arm,realview-eb-syscon", | |
57 | .data = (void *)REALVIEW_FLASHPROT, | |
58 | }, | |
59 | { | |
60 | .compatible = "arm,realview-pb1176-syscon", | |
61 | .data = (void *)REALVIEW_FLASHPROT, | |
62 | }, | |
63 | { | |
64 | .compatible = "arm,realview-pb11mp-syscon", | |
65 | .data = (void *)REALVIEW_FLASHPROT, | |
66 | }, | |
67 | { | |
68 | .compatible = "arm,realview-pba8-syscon", | |
69 | .data = (void *)REALVIEW_FLASHPROT, | |
70 | }, | |
71 | { | |
72 | .compatible = "arm,realview-pbx-syscon", | |
73 | .data = (void *)REALVIEW_FLASHPROT, | |
74 | }, | |
75 | {}, | |
76 | }; | |
77 | ||
78 | /* | |
79 | * Flash protection handling for the Integrator/AP | |
80 | */ | |
81 | #define INTEGRATOR_SC_CTRLS_OFFSET 0x08 | |
82 | #define INTEGRATOR_SC_CTRLC_OFFSET 0x0C | |
83 | #define INTEGRATOR_SC_CTRL_FLVPPEN BIT(1) | |
84 | #define INTEGRATOR_SC_CTRL_FLWP BIT(2) | |
85 | ||
86 | #define INTEGRATOR_EBI_CSR1_OFFSET 0x04 | |
87 | /* The manual says bit 2, the code says bit 3, trust the code */ | |
88 | #define INTEGRATOR_EBI_WRITE_ENABLE BIT(3) | |
89 | #define INTEGRATOR_EBI_LOCK_OFFSET 0x20 | |
90 | #define INTEGRATOR_EBI_LOCK_VAL 0xA05F | |
91 | ||
92 | static const struct of_device_id ebi_match[] = { | |
93 | { .compatible = "arm,external-bus-interface"}, | |
94 | { }, | |
95 | }; | |
96 | ||
97 | static int ap_flash_init(struct platform_device *pdev) | |
98 | { | |
99 | struct device_node *ebi; | |
100 | static void __iomem *ebi_base; | |
101 | u32 val; | |
102 | int ret; | |
103 | ||
104 | /* Look up the EBI */ | |
105 | ebi = of_find_matching_node(NULL, ebi_match); | |
106 | if (!ebi) { | |
107 | return -ENODEV; | |
108 | } | |
109 | ebi_base = of_iomap(ebi, 0); | |
110 | if (!ebi_base) | |
111 | return -ENODEV; | |
112 | ||
113 | /* Clear VPP and write protection bits */ | |
114 | ret = regmap_write(syscon_regmap, | |
115 | INTEGRATOR_SC_CTRLC_OFFSET, | |
116 | INTEGRATOR_SC_CTRL_FLVPPEN | INTEGRATOR_SC_CTRL_FLWP); | |
117 | if (ret) | |
118 | dev_err(&pdev->dev, "error clearing Integrator VPP/WP\n"); | |
119 | ||
120 | /* Unlock the EBI */ | |
121 | writel(INTEGRATOR_EBI_LOCK_VAL, ebi_base + INTEGRATOR_EBI_LOCK_OFFSET); | |
122 | ||
123 | /* Enable write cycles on the EBI, CSR1 (flash) */ | |
124 | val = readl(ebi_base + INTEGRATOR_EBI_CSR1_OFFSET); | |
125 | val |= INTEGRATOR_EBI_WRITE_ENABLE; | |
126 | writel(val, ebi_base + INTEGRATOR_EBI_CSR1_OFFSET); | |
127 | ||
128 | /* Lock the EBI again */ | |
129 | writel(0, ebi_base + INTEGRATOR_EBI_LOCK_OFFSET); | |
130 | iounmap(ebi_base); | |
131 | ||
132 | return 0; | |
133 | } | |
134 | ||
135 | static void ap_flash_set_vpp(struct map_info *map, int on) | |
136 | { | |
137 | int ret; | |
138 | ||
139 | if (on) { | |
140 | ret = regmap_write(syscon_regmap, | |
141 | INTEGRATOR_SC_CTRLS_OFFSET, | |
142 | INTEGRATOR_SC_CTRL_FLVPPEN | INTEGRATOR_SC_CTRL_FLWP); | |
143 | if (ret) | |
144 | pr_err("error enabling AP VPP\n"); | |
145 | } else { | |
146 | ret = regmap_write(syscon_regmap, | |
147 | INTEGRATOR_SC_CTRLC_OFFSET, | |
148 | INTEGRATOR_SC_CTRL_FLVPPEN | INTEGRATOR_SC_CTRL_FLWP); | |
149 | if (ret) | |
150 | pr_err("error disabling AP VPP\n"); | |
151 | } | |
152 | } | |
153 | ||
154 | /* | |
155 | * Flash protection handling for the Integrator/CP | |
156 | */ | |
157 | ||
158 | #define INTCP_FLASHPROG_OFFSET 0x04 | |
159 | #define CINTEGRATOR_FLVPPEN BIT(0) | |
160 | #define CINTEGRATOR_FLWREN BIT(1) | |
161 | #define CINTEGRATOR_FLMASK BIT(0)|BIT(1) | |
162 | ||
163 | static void cp_flash_set_vpp(struct map_info *map, int on) | |
164 | { | |
165 | int ret; | |
166 | ||
167 | if (on) { | |
168 | ret = regmap_update_bits(syscon_regmap, | |
169 | INTCP_FLASHPROG_OFFSET, | |
170 | CINTEGRATOR_FLMASK, | |
171 | CINTEGRATOR_FLVPPEN | CINTEGRATOR_FLWREN); | |
172 | if (ret) | |
173 | pr_err("error setting CP VPP\n"); | |
174 | } else { | |
175 | ret = regmap_update_bits(syscon_regmap, | |
176 | INTCP_FLASHPROG_OFFSET, | |
177 | CINTEGRATOR_FLMASK, | |
178 | 0); | |
179 | if (ret) | |
180 | pr_err("error setting CP VPP\n"); | |
181 | } | |
182 | } | |
183 | ||
184 | /* | |
185 | * Flash protection handling for the Versatiles and RealViews | |
186 | */ | |
187 | ||
188 | #define VERSATILE_SYS_FLASH_OFFSET 0x4C | |
189 | ||
190 | static void versatile_flash_set_vpp(struct map_info *map, int on) | |
191 | { | |
192 | int ret; | |
193 | ||
194 | ret = regmap_update_bits(syscon_regmap, VERSATILE_SYS_FLASH_OFFSET, | |
195 | 0x01, !!on); | |
196 | if (ret) | |
197 | pr_err("error setting Versatile VPP\n"); | |
198 | } | |
199 | ||
200 | int of_flash_probe_versatile(struct platform_device *pdev, | |
201 | struct device_node *np, | |
202 | struct map_info *map) | |
203 | { | |
204 | struct device_node *sysnp; | |
205 | const struct of_device_id *devid; | |
206 | struct regmap *rmap; | |
207 | static enum versatile_flashprot versatile_flashprot; | |
208 | int ret; | |
209 | ||
210 | /* Not all flash chips use this protection line */ | |
211 | if (!of_device_is_compatible(np, "arm,versatile-flash")) | |
212 | return 0; | |
213 | ||
214 | /* For first chip probed, look up the syscon regmap */ | |
215 | if (!syscon_regmap) { | |
216 | sysnp = of_find_matching_node_and_match(NULL, | |
217 | syscon_match, | |
218 | &devid); | |
219 | if (!sysnp) | |
220 | return -ENODEV; | |
221 | ||
222 | versatile_flashprot = (enum versatile_flashprot)devid->data; | |
223 | rmap = syscon_node_to_regmap(sysnp); | |
224 | if (IS_ERR(rmap)) | |
225 | return PTR_ERR(rmap); | |
226 | ||
227 | syscon_regmap = rmap; | |
228 | } | |
229 | ||
230 | switch (versatile_flashprot) { | |
231 | case INTEGRATOR_AP_FLASHPROT: | |
232 | ret = ap_flash_init(pdev); | |
233 | if (ret) | |
234 | return ret; | |
235 | map->set_vpp = ap_flash_set_vpp; | |
236 | dev_info(&pdev->dev, "Integrator/AP flash protection\n"); | |
237 | break; | |
238 | case INTEGRATOR_CP_FLASHPROT: | |
239 | map->set_vpp = cp_flash_set_vpp; | |
240 | dev_info(&pdev->dev, "Integrator/CP flash protection\n"); | |
241 | break; | |
242 | case VERSATILE_FLASHPROT: | |
243 | case REALVIEW_FLASHPROT: | |
244 | map->set_vpp = versatile_flash_set_vpp; | |
245 | dev_info(&pdev->dev, "versatile/realview flash protection\n"); | |
246 | break; | |
247 | default: | |
248 | dev_info(&pdev->dev, "device marked as Versatile flash " | |
249 | "but no system controller was found\n"); | |
250 | break; | |
251 | } | |
252 | ||
253 | return 0; | |
254 | } | |
c5f9d6b1 | 255 | EXPORT_SYMBOL_GPL(of_flash_probe_versatile); |