1
2
3
4
5
6
7
8
9
10#include <linux/module.h>
11#include <linux/clk.h>
12#include <linux/io.h>
13#include <linux/of_device.h>
14#include <linux/mfd/syscon.h>
15#include <linux/mfd/syscon/imx6q-iomuxc-gpr.h>
16#include <linux/regmap.h>
17
18struct 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
48static const struct of_device_id weim_id_table[] = {
49
50 { .compatible = "fsl,imx1-weim", .data = &imx1_weim_devtype, },
51
52 { .compatible = "fsl,imx27-weim", .data = &imx27_weim_devtype, },
53
54 { .compatible = "fsl,imx50-weim", .data = &imx50_weim_devtype, },
55 { .compatible = "fsl,imx6q-weim", .data = &imx50_weim_devtype, },
56
57 { .compatible = "fsl,imx51-weim", .data = &imx51_weim_devtype, },
58 { }
59};
60MODULE_DEVICE_TABLE(of, weim_id_table);
61
62static 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,
70 033,
71 0113,
72 01111,
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
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
111
112static int __init weim_timing_setup(struct device_node *np, void __iomem *base,
113 const struct imx_weim_devtype *devtype)
114{
115 u32 cs_idx, value[devtype->cs_regs_count];
116 int i, ret;
117
118
119 ret = of_property_read_u32(np, "reg", &cs_idx);
120 if (ret)
121 return ret;
122
123 if (cs_idx >= devtype->cs_count)
124 return -EINVAL;
125
126 ret = of_property_read_u32_array(np, "fsl,weim-cs-timing",
127 value, devtype->cs_regs_count);
128 if (ret)
129 return ret;
130
131
132 for (i = 0; i < devtype->cs_regs_count; i++)
133 writel(value[i], base + cs_idx * devtype->cs_stride + i * 4);
134
135 return 0;
136}
137
138static int __init weim_parse_dt(struct platform_device *pdev,
139 void __iomem *base)
140{
141 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;
144 struct device_node *child;
145 int ret, have_child = 0;
146
147 if (devtype == &imx50_weim_devtype) {
148 ret = imx_weim_gpr_setup(pdev);
149 if (ret)
150 return ret;
151 }
152
153 for_each_child_of_node(pdev->dev.of_node, child) {
154 if (!child->name)
155 continue;
156
157 ret = weim_timing_setup(child, base, devtype);
158 if (ret)
159 dev_warn(&pdev->dev, "%s set timing failed.\n",
160 child->full_name);
161 else
162 have_child = 1;
163 }
164
165 if (have_child)
166 ret = of_platform_populate(pdev->dev.of_node,
167 of_default_bus_match_table,
168 NULL, &pdev->dev);
169 if (ret)
170 dev_err(&pdev->dev, "%s fail to create devices.\n",
171 pdev->dev.of_node->full_name);
172 return ret;
173}
174
175static int __init weim_probe(struct platform_device *pdev)
176{
177 struct resource *res;
178 struct clk *clk;
179 void __iomem *base;
180 int ret;
181
182
183 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
184 base = devm_ioremap_resource(&pdev->dev, res);
185 if (IS_ERR(base))
186 return PTR_ERR(base);
187
188
189 clk = devm_clk_get(&pdev->dev, NULL);
190 if (IS_ERR(clk))
191 return PTR_ERR(clk);
192
193 ret = clk_prepare_enable(clk);
194 if (ret)
195 return ret;
196
197
198 ret = weim_parse_dt(pdev, base);
199 if (ret)
200 clk_disable_unprepare(clk);
201 else
202 dev_info(&pdev->dev, "Driver registered.\n");
203
204 return ret;
205}
206
207static struct platform_driver weim_driver = {
208 .driver = {
209 .name = "imx-weim",
210 .of_match_table = weim_id_table,
211 },
212};
213module_platform_driver_probe(weim_driver, weim_probe);
214
215MODULE_AUTHOR("Freescale Semiconductor Inc.");
216MODULE_DESCRIPTION("i.MX EIM Controller Driver");
217MODULE_LICENSE("GPL");
218
