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
23struct crci_config {
24 u32 num_rows;
25 const u32 (*array)[MAX_GSBI];
26};
27
28static 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
41static const struct crci_config config_ipq8064 = {
42 .num_rows = ARRAY_SIZE(crci_ipq8064),
43 .array = crci_ipq8064,
44};
45
46static 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
59static const struct crci_config config_apq8064 = {
60 .num_rows = ARRAY_SIZE(crci_apq8064),
61 .array = crci_apq8064,
62};
63
64static 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
77static const struct crci_config config_msm8960 = {
78 .num_rows = ARRAY_SIZE(crci_msm8960),
79 .array = crci_msm8960,
80};
81
82static 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
105static const struct crci_config config_msm8660 = {
106 .num_rows = ARRAY_SIZE(crci_msm8660),
107 .array = crci_msm8660,
108};
109
110struct gsbi_info {
111 struct clk *hclk;
112 u32 mode;
113 u32 crci;
114 struct regmap *tcsr;
115};
116
117static const struct of_device_id tcsr_dt_match[] __maybe_unused = {
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
125static 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 void __iomem *base;
131 struct gsbi_info *gsbi;
132 int i;
133 u32 mask, gsbi_num;
134 const struct crci_config *config = NULL;
135
136 gsbi = devm_kzalloc(dev: &pdev->dev, size: sizeof(*gsbi), GFP_KERNEL);
137
138 if (!gsbi)
139 return -ENOMEM;
140
141 base = devm_platform_ioremap_resource(pdev, index: 0);
142 if (IS_ERR(ptr: base))
143 return PTR_ERR(ptr: base);
144
145 /* get the tcsr node and setup the config and regmap */
146 gsbi->tcsr = syscon_regmap_lookup_by_phandle(np: node, property: "syscon-tcsr");
147
148 if (!IS_ERR(ptr: gsbi->tcsr)) {
149 tcsr_node = of_parse_phandle(np: node, phandle_name: "syscon-tcsr", index: 0);
150 if (tcsr_node) {
151 match = of_match_node(matches: tcsr_dt_match, node: tcsr_node);
152 if (match)
153 config = match->data;
154 else
155 dev_warn(&pdev->dev, "no matching TCSR\n");
156
157 of_node_put(node: tcsr_node);
158 }
159 }
160
161 if (of_property_read_u32(np: node, propname: "cell-index", out_value: &gsbi_num)) {
162 dev_err(&pdev->dev, "missing cell-index\n");
163 return -EINVAL;
164 }
165
166 if (gsbi_num < 1 || gsbi_num > MAX_GSBI) {
167 dev_err(&pdev->dev, "invalid cell-index\n");
168 return -EINVAL;
169 }
170
171 if (of_property_read_u32(np: node, propname: "qcom,mode", out_value: &gsbi->mode)) {
172 dev_err(&pdev->dev, "missing mode configuration\n");
173 return -EINVAL;
174 }
175
176 /* not required, so default to 0 if not present */
177 of_property_read_u32(np: node, propname: "qcom,crci", out_value: &gsbi->crci);
178
179 dev_info(&pdev->dev, "GSBI port protocol: %d crci: %d\n",
180 gsbi->mode, gsbi->crci);
181 gsbi->hclk = devm_clk_get_enabled(dev: &pdev->dev, id: "iface");
182 if (IS_ERR(ptr: gsbi->hclk))
183 return PTR_ERR(ptr: gsbi->hclk);
184
185 writel_relaxed((gsbi->mode << GSBI_PROTOCOL_SHIFT) | gsbi->crci,
186 base + GSBI_CTRL_REG);
187
188 /*
189 * modify tcsr to reflect mode and ADM CRCI mux
190 * Each gsbi contains a pair of bits, one for RX and one for TX
191 * SPI mode requires both bits cleared, otherwise they are set
192 */
193 if (config) {
194 for (i = 0; i < config->num_rows; i++) {
195 mask = config->array[i][gsbi_num - 1];
196
197 if (gsbi->mode == GSBI_PROT_SPI)
198 regmap_update_bits(map: gsbi->tcsr,
199 TCSR_ADM_CRCI_BASE + 4 * i, mask, val: 0);
200 else
201 regmap_update_bits(map: gsbi->tcsr,
202 TCSR_ADM_CRCI_BASE + 4 * i, mask, val: mask);
203
204 }
205 }
206
207 /* make sure the gsbi control write is not reordered */
208 wmb();
209
210 platform_set_drvdata(pdev, data: gsbi);
211
212 return of_platform_populate(root: node, NULL, NULL, parent: &pdev->dev);
213}
214
215static const struct of_device_id gsbi_dt_match[] = {
216 { .compatible = "qcom,gsbi-v1.0.0", },
217 { },
218};
219
220MODULE_DEVICE_TABLE(of, gsbi_dt_match);
221
222static struct platform_driver gsbi_driver = {
223 .driver = {
224 .name = "gsbi",
225 .of_match_table = gsbi_dt_match,
226 },
227 .probe = gsbi_probe,
228};
229
230module_platform_driver(gsbi_driver);
231
232MODULE_AUTHOR("Andy Gross <agross@codeaurora.org>");
233MODULE_DESCRIPTION("QCOM GSBI driver");
234MODULE_LICENSE("GPL v2");
235

source code of linux/drivers/soc/qcom/qcom_gsbi.c