2 * EIM driver for Freescale's i.MX chips
4 * Copyright (C) 2013 Freescale Semiconductor, Inc.
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.
10 #include <linux/module.h>
11 #include <linux/clk.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>
18 struct imx_weim_devtype {
19 unsigned int cs_count;
20 unsigned int cs_regs_count;
21 unsigned int cs_stride;
24 static const struct imx_weim_devtype imx1_weim_devtype = {
30 static const struct imx_weim_devtype imx27_weim_devtype = {
36 static const struct imx_weim_devtype imx50_weim_devtype = {
42 static const struct imx_weim_devtype imx51_weim_devtype = {
48 static const struct of_device_id weim_id_table[] = {
50 { .compatible = "fsl,imx1-weim", .data = &imx1_weim_devtype, },
52 { .compatible = "fsl,imx27-weim", .data = &imx27_weim_devtype, },
54 { .compatible = "fsl,imx50-weim", .data = &imx50_weim_devtype, },
55 { .compatible = "fsl,imx6q-weim", .data = &imx50_weim_devtype, },
57 { .compatible = "fsl,imx51-weim", .data = &imx51_weim_devtype, },
60 MODULE_DEVICE_TABLE(of, weim_id_table);
62 static int __init imx_weim_gpr_setup(struct platform_device *pdev)
64 struct device_node *np = pdev->dev.of_node;
65 struct property *prop;
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) */
79 gpr = syscon_regmap_lookup_by_phandle(np, "fsl,weim-cs-gpr");
81 dev_dbg(&pdev->dev, "failed to find weim-cs-gpr\n");
85 of_property_for_each_u32(np, "ranges", prop, p, val) {
88 } else if (i % 4 == 3 && val) {
89 val = (val / SZ_32M) | 1;
90 gprval |= val << cs * 3;
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);
107 dev_err(&pdev->dev, "Invalid 'ranges' configuration\n");
111 /* Parse and set the timing for this device. */
112 static int __init weim_timing_setup(struct device_node *np, void __iomem *base,
113 const struct imx_weim_devtype *devtype)
115 u32 cs_idx, value[devtype->cs_regs_count];
118 /* get the CS index from this child node's "reg" property. */
119 ret = of_property_read_u32(np, "reg", &cs_idx);
123 if (cs_idx >= devtype->cs_count)
126 ret = of_property_read_u32_array(np, "fsl,weim-cs-timing",
127 value, devtype->cs_regs_count);
131 /* set the timing for WEIM */
132 for (i = 0; i < devtype->cs_regs_count; i++)
133 writel(value[i], base + cs_idx * devtype->cs_stride + i * 4);
138 static int __init weim_parse_dt(struct platform_device *pdev,
141 const struct of_device_id *of_id = of_match_device(weim_id_table,
143 const struct imx_weim_devtype *devtype = of_id->data;
144 struct device_node *child;
145 int ret, have_child = 0;
147 if (devtype == &imx50_weim_devtype) {
148 ret = imx_weim_gpr_setup(pdev);
153 for_each_child_of_node(pdev->dev.of_node, child) {
157 ret = weim_timing_setup(child, base, devtype);
159 dev_warn(&pdev->dev, "%s set timing failed.\n",
166 ret = of_platform_populate(pdev->dev.of_node,
167 of_default_bus_match_table,
170 dev_err(&pdev->dev, "%s fail to create devices.\n",
171 pdev->dev.of_node->full_name);
175 static int __init weim_probe(struct platform_device *pdev)
177 struct resource *res;
182 /* get the resource */
183 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
184 base = devm_ioremap_resource(&pdev->dev, res);
186 return PTR_ERR(base);
189 clk = devm_clk_get(&pdev->dev, NULL);
193 ret = clk_prepare_enable(clk);
197 /* parse the device node */
198 ret = weim_parse_dt(pdev, base);
200 clk_disable_unprepare(clk);
202 dev_info(&pdev->dev, "Driver registered.\n");
207 static struct platform_driver weim_driver = {
210 .of_match_table = weim_id_table,
213 module_platform_driver_probe(weim_driver, weim_probe);
215 MODULE_AUTHOR("Freescale Semiconductor Inc.");
216 MODULE_DESCRIPTION("i.MX EIM Controller Driver");
217 MODULE_LICENSE("GPL");