qcom_gsbi.c

  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(&pdev->dev, sizeof(*gsbi), GFP_KERNEL);
137
138	if (!gsbi)
139		return -ENOMEM;
140
141	base = devm_platform_ioremap_resource(pdev, 0);
142	if (IS_ERR(base))
143		return PTR_ERR(base);
144
145	/* get the tcsr node and setup the config and regmap */
146	gsbi->tcsr = syscon_regmap_lookup_by_phandle(node, "syscon-tcsr");
147
148	if (!IS_ERR(gsbi->tcsr)) {
149		tcsr_node = of_parse_phandle(node, "syscon-tcsr", 0);
150		if (tcsr_node) {
151			match = of_match_node(tcsr_dt_match, 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(tcsr_node);
158		}
159	}
160
161	if (of_property_read_u32(node, "cell-index", &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(node, "qcom,mode", &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(node, "qcom,crci", &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(&pdev->dev, "iface");
182	if (IS_ERR(gsbi->hclk))
183		return PTR_ERR(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(gsbi->tcsr,
199					TCSR_ADM_CRCI_BASE + 4 * i, mask, 0);
200			else
201				regmap_update_bits(gsbi->tcsr,
202					TCSR_ADM_CRCI_BASE + 4 * i, mask, mask);
203
204		}
205	}
206
207	/* make sure the gsbi control write is not reordered */
208	wmb();
209
210	platform_set_drvdata(pdev, gsbi);
211
212	return of_platform_populate(node, NULL, NULL, &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");