1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (c) 2014, The Linux foundation. All rights reserved.
4 */
5
6 #include <linux/clk.h>
7 #include <linux/err.h>
8 #include <linux/io.h>
9 #include <linux/module.h>
10 #include <linux/of.h>
11 #include <linux/of_platform.h>
12 #include <linux/platform_device.h>
13 #include <linux/regmap.h>
14 #include <linux/mfd/syscon.h>
15 #include <dt-bindings/soc/qcom,gsbi.h>
16
17 #define GSBI_CTRL_REG 0x0000
18 #define GSBI_PROTOCOL_SHIFT 4
19 #define MAX_GSBI 12
20
21 #define TCSR_ADM_CRCI_BASE 0x70
22
23 struct crci_config {
24 u32 num_rows;
25 const u32 (*array)[MAX_GSBI];
26 };
27
28 static const u32 crci_ipq8064[][MAX_GSBI] = {
29 {
30 0x000003, 0x00000c, 0x000030, 0x0000c0,
31 0x000300, 0x000c00, 0x003000, 0x00c000,
32 0x030000, 0x0c0000, 0x300000, 0xc00000
33 },
34 {
35 0x000003, 0x00000c, 0x000030, 0x0000c0,
36 0x000300, 0x000c00, 0x003000, 0x00c000,
37 0x030000, 0x0c0000, 0x300000, 0xc00000
38 },
39 };
40
41 static const struct crci_config config_ipq8064 = {
42 .num_rows = ARRAY_SIZE(crci_ipq8064),
43 .array = crci_ipq8064,
44 };
45
46 static const unsigned int crci_apq8064[][MAX_GSBI] = {
47 {
48 0x001800, 0x006000, 0x000030, 0x0000c0,
49 0x000300, 0x000400, 0x000000, 0x000000,
50 0x000000, 0x000000, 0x000000, 0x000000
51 },
52 {
53 0x000000, 0x000000, 0x000000, 0x000000,
54 0x000000, 0x000020, 0x0000c0, 0x000000,
55 0x000000, 0x000000, 0x000000, 0x000000
56 },
57 };
58
59 static const struct crci_config config_apq8064 = {
60 .num_rows = ARRAY_SIZE(crci_apq8064),
61 .array = crci_apq8064,
62 };
63
64 static const unsigned int crci_msm8960[][MAX_GSBI] = {
65 {
66 0x000003, 0x00000c, 0x000030, 0x0000c0,
67 0x000300, 0x000400, 0x000000, 0x000000,
68 0x000000, 0x000000, 0x000000, 0x000000
69 },
70 {
71 0x000000, 0x000000, 0x000000, 0x000000,
72 0x000000, 0x000020, 0x0000c0, 0x000300,
73 0x001800, 0x006000, 0x000000, 0x000000
74 },
75 };
76
77 static const struct crci_config config_msm8960 = {
78 .num_rows = ARRAY_SIZE(crci_msm8960),
79 .array = crci_msm8960,
80 };
81
82 static const unsigned int crci_msm8660[][MAX_GSBI] = {
83 { /* ADM 0 - B */
84 0x000003, 0x00000c, 0x000030, 0x0000c0,
85 0x000300, 0x000c00, 0x003000, 0x00c000,
86 0x030000, 0x0c0000, 0x300000, 0xc00000
87 },
88 { /* ADM 0 - B */
89 0x000003, 0x00000c, 0x000030, 0x0000c0,
90 0x000300, 0x000c00, 0x003000, 0x00c000,
91 0x030000, 0x0c0000, 0x300000, 0xc00000
92 },
93 { /* ADM 1 - A */
94 0x000003, 0x00000c, 0x000030, 0x0000c0,
95 0x000300, 0x000c00, 0x003000, 0x00c000,
96 0x030000, 0x0c0000, 0x300000, 0xc00000
97 },
98 { /* ADM 1 - B */
99 0x000003, 0x00000c, 0x000030, 0x0000c0,
100 0x000300, 0x000c00, 0x003000, 0x00c000,
101 0x030000, 0x0c0000, 0x300000, 0xc00000
102 },
103 };
104
105 static const struct crci_config config_msm8660 = {
106 .num_rows = ARRAY_SIZE(crci_msm8660),
107 .array = crci_msm8660,
108 };
109
110 struct gsbi_info {
111 struct clk *hclk;
112 u32 mode;
113 u32 crci;
114 struct regmap *tcsr;
115 };
116
117 static const struct of_device_id tcsr_dt_match[] = {
118 { .compatible = "qcom,tcsr-ipq8064", .data = &config_ipq8064},
119 { .compatible = "qcom,tcsr-apq8064", .data = &config_apq8064},
120 { .compatible = "qcom,tcsr-msm8960", .data = &config_msm8960},
121 { .compatible = "qcom,tcsr-msm8660", .data = &config_msm8660},
122 { },
123 };
124
gsbi_probe(struct platform_device * pdev)125 static int gsbi_probe(struct platform_device *pdev)
126 {
127 struct device_node *node = pdev->dev.of_node;
128 struct device_node *tcsr_node;
129 const struct of_device_id *match;
130 struct resource *res;
131 void __iomem *base;
132 struct gsbi_info *gsbi;
133 int i, ret;
134 u32 mask, gsbi_num;
135 const struct crci_config *config = NULL;
136
137 gsbi = devm_kzalloc(&pdev->dev, sizeof(*gsbi), GFP_KERNEL);
138
139 if (!gsbi)
140 return -ENOMEM;
141
142 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
143 base = devm_ioremap_resource(&pdev->dev, res);
144 if (IS_ERR(base))
145 return PTR_ERR(base);
146
147 /* get the tcsr node and setup the config and regmap */
148 gsbi->tcsr = syscon_regmap_lookup_by_phandle(node, "syscon-tcsr");
149
150 if (!IS_ERR(gsbi->tcsr)) {
151 tcsr_node = of_parse_phandle(node, "syscon-tcsr", 0);
152 if (tcsr_node) {
153 match = of_match_node(tcsr_dt_match, tcsr_node);
154 if (match)
155 config = match->data;
156 else
157 dev_warn(&pdev->dev, "no matching TCSR\n");
158
159 of_node_put(tcsr_node);
160 }
161 }
162
163 if (of_property_read_u32(node, "cell-index", &gsbi_num)) {
164 dev_err(&pdev->dev, "missing cell-index\n");
165 return -EINVAL;
166 }
167
168 if (gsbi_num < 1 || gsbi_num > MAX_GSBI) {
169 dev_err(&pdev->dev, "invalid cell-index\n");
170 return -EINVAL;
171 }
172
173 if (of_property_read_u32(node, "qcom,mode", &gsbi->mode)) {
174 dev_err(&pdev->dev, "missing mode configuration\n");
175 return -EINVAL;
176 }
177
178 /* not required, so default to 0 if not present */
179 of_property_read_u32(node, "qcom,crci", &gsbi->crci);
180
181 dev_info(&pdev->dev, "GSBI port protocol: %d crci: %d\n",
182 gsbi->mode, gsbi->crci);
183 gsbi->hclk = devm_clk_get(&pdev->dev, "iface");
184 if (IS_ERR(gsbi->hclk))
185 return PTR_ERR(gsbi->hclk);
186
187 clk_prepare_enable(gsbi->hclk);
188
189 writel_relaxed((gsbi->mode << GSBI_PROTOCOL_SHIFT) | gsbi->crci,
190 base + GSBI_CTRL_REG);
191
192 /*
193 * modify tcsr to reflect mode and ADM CRCI mux
194 * Each gsbi contains a pair of bits, one for RX and one for TX
195 * SPI mode requires both bits cleared, otherwise they are set
196 */
197 if (config) {
198 for (i = 0; i < config->num_rows; i++) {
199 mask = config->array[i][gsbi_num - 1];
200
201 if (gsbi->mode == GSBI_PROT_SPI)
202 regmap_update_bits(gsbi->tcsr,
203 TCSR_ADM_CRCI_BASE + 4 * i, mask, 0);
204 else
205 regmap_update_bits(gsbi->tcsr,
206 TCSR_ADM_CRCI_BASE + 4 * i, mask, mask);
207
208 }
209 }
210
211 /* make sure the gsbi control write is not reordered */
212 wmb();
213
214 platform_set_drvdata(pdev, gsbi);
215
216 ret = of_platform_populate(node, NULL, NULL, &pdev->dev);
217 if (ret)
218 clk_disable_unprepare(gsbi->hclk);
219 return ret;
220 }
221
gsbi_remove(struct platform_device * pdev)222 static int gsbi_remove(struct platform_device *pdev)
223 {
224 struct gsbi_info *gsbi = platform_get_drvdata(pdev);
225
226 clk_disable_unprepare(gsbi->hclk);
227
228 return 0;
229 }
230
231 static const struct of_device_id gsbi_dt_match[] = {
232 { .compatible = "qcom,gsbi-v1.0.0", },
233 { },
234 };
235
236 MODULE_DEVICE_TABLE(of, gsbi_dt_match);
237
238 static struct platform_driver gsbi_driver = {
239 .driver = {
240 .name = "gsbi",
241 .of_match_table = gsbi_dt_match,
242 },
243 .probe = gsbi_probe,
244 .remove = gsbi_remove,
245 };
246
247 module_platform_driver(gsbi_driver);
248
249 MODULE_AUTHOR("Andy Gross <agross@codeaurora.org>");
250 MODULE_DESCRIPTION("QCOM GSBI driver");
251 MODULE_LICENSE("GPL v2");
252