This source file includes following definitions.
- da8xx_mstpri_get_board_prio
- da8xx_mstpri_probe
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11 #include <linux/module.h>
12 #include <linux/of.h>
13 #include <linux/platform_device.h>
14 #include <linux/io.h>
15 #include <linux/regmap.h>
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28
29 #define DA8XX_MSTPRI0_OFFSET 0
30 #define DA8XX_MSTPRI1_OFFSET 4
31 #define DA8XX_MSTPRI2_OFFSET 8
32
33 enum {
34 DA8XX_MSTPRI_ARM_I = 0,
35 DA8XX_MSTPRI_ARM_D,
36 DA8XX_MSTPRI_UPP,
37 DA8XX_MSTPRI_SATA,
38 DA8XX_MSTPRI_PRU0,
39 DA8XX_MSTPRI_PRU1,
40 DA8XX_MSTPRI_EDMA30TC0,
41 DA8XX_MSTPRI_EDMA30TC1,
42 DA8XX_MSTPRI_EDMA31TC0,
43 DA8XX_MSTPRI_VPIF_DMA_0,
44 DA8XX_MSTPRI_VPIF_DMA_1,
45 DA8XX_MSTPRI_EMAC,
46 DA8XX_MSTPRI_USB0CFG,
47 DA8XX_MSTPRI_USB0CDMA,
48 DA8XX_MSTPRI_UHPI,
49 DA8XX_MSTPRI_USB1,
50 DA8XX_MSTPRI_LCDC,
51 };
52
53 struct da8xx_mstpri_descr {
54 int reg;
55 int shift;
56 int mask;
57 };
58
59 static const struct da8xx_mstpri_descr da8xx_mstpri_priority_list[] = {
60 [DA8XX_MSTPRI_ARM_I] = {
61 .reg = DA8XX_MSTPRI0_OFFSET,
62 .shift = 0,
63 .mask = 0x0000000f,
64 },
65 [DA8XX_MSTPRI_ARM_D] = {
66 .reg = DA8XX_MSTPRI0_OFFSET,
67 .shift = 4,
68 .mask = 0x000000f0,
69 },
70 [DA8XX_MSTPRI_UPP] = {
71 .reg = DA8XX_MSTPRI0_OFFSET,
72 .shift = 16,
73 .mask = 0x000f0000,
74 },
75 [DA8XX_MSTPRI_SATA] = {
76 .reg = DA8XX_MSTPRI0_OFFSET,
77 .shift = 20,
78 .mask = 0x00f00000,
79 },
80 [DA8XX_MSTPRI_PRU0] = {
81 .reg = DA8XX_MSTPRI1_OFFSET,
82 .shift = 0,
83 .mask = 0x0000000f,
84 },
85 [DA8XX_MSTPRI_PRU1] = {
86 .reg = DA8XX_MSTPRI1_OFFSET,
87 .shift = 4,
88 .mask = 0x000000f0,
89 },
90 [DA8XX_MSTPRI_EDMA30TC0] = {
91 .reg = DA8XX_MSTPRI1_OFFSET,
92 .shift = 8,
93 .mask = 0x00000f00,
94 },
95 [DA8XX_MSTPRI_EDMA30TC1] = {
96 .reg = DA8XX_MSTPRI1_OFFSET,
97 .shift = 12,
98 .mask = 0x0000f000,
99 },
100 [DA8XX_MSTPRI_EDMA31TC0] = {
101 .reg = DA8XX_MSTPRI1_OFFSET,
102 .shift = 16,
103 .mask = 0x000f0000,
104 },
105 [DA8XX_MSTPRI_VPIF_DMA_0] = {
106 .reg = DA8XX_MSTPRI1_OFFSET,
107 .shift = 24,
108 .mask = 0x0f000000,
109 },
110 [DA8XX_MSTPRI_VPIF_DMA_1] = {
111 .reg = DA8XX_MSTPRI1_OFFSET,
112 .shift = 28,
113 .mask = 0xf0000000,
114 },
115 [DA8XX_MSTPRI_EMAC] = {
116 .reg = DA8XX_MSTPRI2_OFFSET,
117 .shift = 0,
118 .mask = 0x0000000f,
119 },
120 [DA8XX_MSTPRI_USB0CFG] = {
121 .reg = DA8XX_MSTPRI2_OFFSET,
122 .shift = 8,
123 .mask = 0x00000f00,
124 },
125 [DA8XX_MSTPRI_USB0CDMA] = {
126 .reg = DA8XX_MSTPRI2_OFFSET,
127 .shift = 12,
128 .mask = 0x0000f000,
129 },
130 [DA8XX_MSTPRI_UHPI] = {
131 .reg = DA8XX_MSTPRI2_OFFSET,
132 .shift = 20,
133 .mask = 0x00f00000,
134 },
135 [DA8XX_MSTPRI_USB1] = {
136 .reg = DA8XX_MSTPRI2_OFFSET,
137 .shift = 24,
138 .mask = 0x0f000000,
139 },
140 [DA8XX_MSTPRI_LCDC] = {
141 .reg = DA8XX_MSTPRI2_OFFSET,
142 .shift = 28,
143 .mask = 0xf0000000,
144 },
145 };
146
147 struct da8xx_mstpri_priority {
148 int which;
149 u32 val;
150 };
151
152 struct da8xx_mstpri_board_priorities {
153 const char *board;
154 const struct da8xx_mstpri_priority *priorities;
155 size_t numprio;
156 };
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166 static const struct da8xx_mstpri_priority da850_lcdk_priorities[] = {
167 {
168 .which = DA8XX_MSTPRI_LCDC,
169 .val = 0,
170 },
171 {
172 .which = DA8XX_MSTPRI_EDMA30TC1,
173 .val = 0,
174 },
175 {
176 .which = DA8XX_MSTPRI_EDMA30TC0,
177 .val = 1,
178 },
179 };
180
181 static const struct da8xx_mstpri_board_priorities da8xx_mstpri_board_confs[] = {
182 {
183 .board = "ti,da850-lcdk",
184 .priorities = da850_lcdk_priorities,
185 .numprio = ARRAY_SIZE(da850_lcdk_priorities),
186 },
187 };
188
189 static const struct da8xx_mstpri_board_priorities *
190 da8xx_mstpri_get_board_prio(void)
191 {
192 const struct da8xx_mstpri_board_priorities *board_prio;
193 int i;
194
195 for (i = 0; i < ARRAY_SIZE(da8xx_mstpri_board_confs); i++) {
196 board_prio = &da8xx_mstpri_board_confs[i];
197
198 if (of_machine_is_compatible(board_prio->board))
199 return board_prio;
200 }
201
202 return NULL;
203 }
204
205 static int da8xx_mstpri_probe(struct platform_device *pdev)
206 {
207 const struct da8xx_mstpri_board_priorities *prio_list;
208 const struct da8xx_mstpri_descr *prio_descr;
209 const struct da8xx_mstpri_priority *prio;
210 struct device *dev = &pdev->dev;
211 struct resource *res;
212 void __iomem *mstpri;
213 u32 reg;
214 int i;
215
216 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
217 mstpri = devm_ioremap_resource(dev, res);
218 if (IS_ERR(mstpri)) {
219 dev_err(dev, "unable to map MSTPRI registers\n");
220 return PTR_ERR(mstpri);
221 }
222
223 prio_list = da8xx_mstpri_get_board_prio();
224 if (!prio_list) {
225 dev_err(dev, "no master priorities defined for this board\n");
226 return -EINVAL;
227 }
228
229 for (i = 0; i < prio_list->numprio; i++) {
230 prio = &prio_list->priorities[i];
231 prio_descr = &da8xx_mstpri_priority_list[prio->which];
232
233 if (prio_descr->reg + sizeof(u32) > resource_size(res)) {
234 dev_warn(dev, "register offset out of range\n");
235 continue;
236 }
237
238 reg = readl(mstpri + prio_descr->reg);
239 reg &= ~prio_descr->mask;
240 reg |= prio->val << prio_descr->shift;
241
242 writel(reg, mstpri + prio_descr->reg);
243 }
244
245 return 0;
246 }
247
248 static const struct of_device_id da8xx_mstpri_of_match[] = {
249 { .compatible = "ti,da850-mstpri", },
250 { },
251 };
252
253 static struct platform_driver da8xx_mstpri_driver = {
254 .probe = da8xx_mstpri_probe,
255 .driver = {
256 .name = "da8xx-mstpri",
257 .of_match_table = da8xx_mstpri_of_match,
258 },
259 };
260 module_platform_driver(da8xx_mstpri_driver);
261
262 MODULE_AUTHOR("Bartosz Golaszewski <bgolaszewski@baylibre.com>");
263 MODULE_DESCRIPTION("TI da8xx master peripheral priority driver");
264 MODULE_LICENSE("GPL v2");