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Huang Shijie85bf6d42013-05-28 14:20:07 +08001/*
2 * EIM driver for Freescale's i.MX chips
3 *
4 * Copyright (C) 2013 Freescale Semiconductor, Inc.
5 *
6 * This file is licensed under the terms of the GNU General Public
7 * License version 2. This program is licensed "as is" without any
8 * warranty of any kind, whether express or implied.
9 */
10#include <linux/module.h>
11#include <linux/clk.h>
12#include <linux/io.h>
13#include <linux/of_device.h>
Shawn Guo8d9ee212014-02-11 09:52:09 +080014#include <linux/mfd/syscon.h>
15#include <linux/mfd/syscon/imx6q-iomuxc-gpr.h>
16#include <linux/regmap.h>
Huang Shijie85bf6d42013-05-28 14:20:07 +080017
Alexander Shiyan3f98b6b2013-06-29 08:27:54 +040018struct imx_weim_devtype {
19 unsigned int cs_count;
20 unsigned int cs_regs_count;
21 unsigned int cs_stride;
22};
23
24static const struct imx_weim_devtype imx1_weim_devtype = {
25 .cs_count = 6,
26 .cs_regs_count = 2,
27 .cs_stride = 0x08,
28};
29
30static const struct imx_weim_devtype imx27_weim_devtype = {
31 .cs_count = 6,
32 .cs_regs_count = 3,
33 .cs_stride = 0x10,
34};
35
36static const struct imx_weim_devtype imx50_weim_devtype = {
37 .cs_count = 4,
38 .cs_regs_count = 6,
39 .cs_stride = 0x18,
40};
41
42static const struct imx_weim_devtype imx51_weim_devtype = {
43 .cs_count = 6,
44 .cs_regs_count = 6,
45 .cs_stride = 0x18,
46};
47
Huang Shijie85bf6d42013-05-28 14:20:07 +080048static const struct of_device_id weim_id_table[] = {
Alexander Shiyan3f98b6b2013-06-29 08:27:54 +040049 /* i.MX1/21 */
50 { .compatible = "fsl,imx1-weim", .data = &imx1_weim_devtype, },
51 /* i.MX25/27/31/35 */
52 { .compatible = "fsl,imx27-weim", .data = &imx27_weim_devtype, },
53 /* i.MX50/53/6Q */
54 { .compatible = "fsl,imx50-weim", .data = &imx50_weim_devtype, },
55 { .compatible = "fsl,imx6q-weim", .data = &imx50_weim_devtype, },
56 /* i.MX51 */
57 { .compatible = "fsl,imx51-weim", .data = &imx51_weim_devtype, },
58 { }
Huang Shijie85bf6d42013-05-28 14:20:07 +080059};
60MODULE_DEVICE_TABLE(of, weim_id_table);
61
Shawn Guo8d9ee212014-02-11 09:52:09 +080062static int __init imx_weim_gpr_setup(struct platform_device *pdev)
63{
64 struct device_node *np = pdev->dev.of_node;
65 struct property *prop;
66 const __be32 *p;
67 struct regmap *gpr;
68 u32 gprvals[4] = {
69 05, /* CS0(128M) CS1(0M) CS2(0M) CS3(0M) */
70 033, /* CS0(64M) CS1(64M) CS2(0M) CS3(0M) */
71 0113, /* CS0(64M) CS1(32M) CS2(32M) CS3(0M) */
72 01111, /* CS0(32M) CS1(32M) CS2(32M) CS3(32M) */
73 };
74 u32 gprval = 0;
75 u32 val;
76 int cs = 0;
77 int i = 0;
78
79 gpr = syscon_regmap_lookup_by_phandle(np, "fsl,weim-cs-gpr");
80 if (IS_ERR(gpr)) {
81 dev_dbg(&pdev->dev, "failed to find weim-cs-gpr\n");
82 return 0;
83 }
84
85 of_property_for_each_u32(np, "ranges", prop, p, val) {
86 if (i % 4 == 0) {
87 cs = val;
88 } else if (i % 4 == 3 && val) {
89 val = (val / SZ_32M) | 1;
90 gprval |= val << cs * 3;
91 }
92 i++;
93 }
94
95 if (i == 0 || i % 4)
96 goto err;
97
98 for (i = 0; i < ARRAY_SIZE(gprvals); i++) {
99 if (gprval == gprvals[i]) {
100 /* Found it. Set up IOMUXC_GPR1[11:0] with it. */
101 regmap_update_bits(gpr, IOMUXC_GPR1, 0xfff, gprval);
102 return 0;
103 }
104 }
105
106err:
107 dev_err(&pdev->dev, "Invalid 'ranges' configuration\n");
108 return -EINVAL;
109}
110
Huang Shijie85bf6d42013-05-28 14:20:07 +0800111/* Parse and set the timing for this device. */
Alexander Shiyan3f98b6b2013-06-29 08:27:54 +0400112static int __init weim_timing_setup(struct device_node *np, void __iomem *base,
113 const struct imx_weim_devtype *devtype)
Huang Shijie85bf6d42013-05-28 14:20:07 +0800114{
Alexander Shiyan3f98b6b2013-06-29 08:27:54 +0400115 u32 cs_idx, value[devtype->cs_regs_count];
116 int i, ret;
Huang Shijie85bf6d42013-05-28 14:20:07 +0800117
118 /* get the CS index from this child node's "reg" property. */
119 ret = of_property_read_u32(np, "reg", &cs_idx);
120 if (ret)
121 return ret;
122
Alexander Shiyan3f98b6b2013-06-29 08:27:54 +0400123 if (cs_idx >= devtype->cs_count)
Huang Shijie85bf6d42013-05-28 14:20:07 +0800124 return -EINVAL;
125
126 ret = of_property_read_u32_array(np, "fsl,weim-cs-timing",
Alexander Shiyan3f98b6b2013-06-29 08:27:54 +0400127 value, devtype->cs_regs_count);
Huang Shijie85bf6d42013-05-28 14:20:07 +0800128 if (ret)
129 return ret;
130
131 /* set the timing for WEIM */
Alexander Shiyan3f98b6b2013-06-29 08:27:54 +0400132 for (i = 0; i < devtype->cs_regs_count; i++)
133 writel(value[i], base + cs_idx * devtype->cs_stride + i * 4);
134
Huang Shijie85bf6d42013-05-28 14:20:07 +0800135 return 0;
136}
137
Alexander Shiyan29e54972013-06-29 08:27:52 +0400138static int __init weim_parse_dt(struct platform_device *pdev,
139 void __iomem *base)
Huang Shijie85bf6d42013-05-28 14:20:07 +0800140{
Alexander Shiyan3f98b6b2013-06-29 08:27:54 +0400141 const struct of_device_id *of_id = of_match_device(weim_id_table,
142 &pdev->dev);
143 const struct imx_weim_devtype *devtype = of_id->data;
Huang Shijie85bf6d42013-05-28 14:20:07 +0800144 struct device_node *child;
145 int ret;
146
Shawn Guo8d9ee212014-02-11 09:52:09 +0800147 if (devtype == &imx50_weim_devtype) {
148 ret = imx_weim_gpr_setup(pdev);
149 if (ret)
150 return ret;
151 }
152
Huang Shijie85bf6d42013-05-28 14:20:07 +0800153 for_each_child_of_node(pdev->dev.of_node, child) {
154 if (!child->name)
155 continue;
156
Alexander Shiyan3f98b6b2013-06-29 08:27:54 +0400157 ret = weim_timing_setup(child, base, devtype);
Huang Shijie85bf6d42013-05-28 14:20:07 +0800158 if (ret) {
159 dev_err(&pdev->dev, "%s set timing failed.\n",
160 child->full_name);
161 return ret;
162 }
163 }
164
165 ret = of_platform_populate(pdev->dev.of_node, NULL, NULL, &pdev->dev);
166 if (ret)
167 dev_err(&pdev->dev, "%s fail to create devices.\n",
168 pdev->dev.of_node->full_name);
169 return ret;
170}
171
Alexander Shiyan29e54972013-06-29 08:27:52 +0400172static int __init weim_probe(struct platform_device *pdev)
Huang Shijie85bf6d42013-05-28 14:20:07 +0800173{
Huang Shijie85bf6d42013-05-28 14:20:07 +0800174 struct resource *res;
Alexander Shiyan70ac98d2013-06-29 08:27:50 +0400175 struct clk *clk;
176 void __iomem *base;
Alexander Shiyanb2d1fb72013-06-29 08:27:51 +0400177 int ret;
Huang Shijie85bf6d42013-05-28 14:20:07 +0800178
Huang Shijie85bf6d42013-05-28 14:20:07 +0800179 /* get the resource */
180 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
Alexander Shiyan70ac98d2013-06-29 08:27:50 +0400181 base = devm_ioremap_resource(&pdev->dev, res);
Alexander Shiyanb2d1fb72013-06-29 08:27:51 +0400182 if (IS_ERR(base))
183 return PTR_ERR(base);
Huang Shijie85bf6d42013-05-28 14:20:07 +0800184
185 /* get the clock */
Alexander Shiyan70ac98d2013-06-29 08:27:50 +0400186 clk = devm_clk_get(&pdev->dev, NULL);
187 if (IS_ERR(clk))
Alexander Shiyanb2d1fb72013-06-29 08:27:51 +0400188 return PTR_ERR(clk);
Huang Shijie85bf6d42013-05-28 14:20:07 +0800189
Alexander Shiyan70ac98d2013-06-29 08:27:50 +0400190 ret = clk_prepare_enable(clk);
Huang Shijie85bf6d42013-05-28 14:20:07 +0800191 if (ret)
Alexander Shiyanb2d1fb72013-06-29 08:27:51 +0400192 return ret;
Huang Shijie85bf6d42013-05-28 14:20:07 +0800193
194 /* parse the device node */
Alexander Shiyan70ac98d2013-06-29 08:27:50 +0400195 ret = weim_parse_dt(pdev, base);
Alexander Shiyanb2d1fb72013-06-29 08:27:51 +0400196 if (ret)
Alexander Shiyan70ac98d2013-06-29 08:27:50 +0400197 clk_disable_unprepare(clk);
Alexander Shiyanb2d1fb72013-06-29 08:27:51 +0400198 else
199 dev_info(&pdev->dev, "Driver registered.\n");
Huang Shijie85bf6d42013-05-28 14:20:07 +0800200
Huang Shijie85bf6d42013-05-28 14:20:07 +0800201 return ret;
202}
203
204static struct platform_driver weim_driver = {
205 .driver = {
Alexander Shiyanfc608c72013-06-29 08:27:53 +0400206 .name = "imx-weim",
207 .owner = THIS_MODULE,
208 .of_match_table = weim_id_table,
Huang Shijie85bf6d42013-05-28 14:20:07 +0800209 },
Huang Shijie85bf6d42013-05-28 14:20:07 +0800210};
Alexander Shiyan29e54972013-06-29 08:27:52 +0400211module_platform_driver_probe(weim_driver, weim_probe);
Huang Shijie85bf6d42013-05-28 14:20:07 +0800212
Huang Shijie85bf6d42013-05-28 14:20:07 +0800213MODULE_AUTHOR("Freescale Semiconductor Inc.");
214MODULE_DESCRIPTION("i.MX EIM Controller Driver");
215MODULE_LICENSE("GPL");