1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-only
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * i.MX IIM driver
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * Copyright (c) 2017 Pengutronix, Michael Grzeschik <m.grzeschik@pengutronix.de>
6*4882a593Smuzhiyun *
7*4882a593Smuzhiyun * Based on the barebox iim driver,
8*4882a593Smuzhiyun * Copyright (c) 2010 Baruch Siach <baruch@tkos.co.il>,
9*4882a593Smuzhiyun * Orex Computed Radiography
10*4882a593Smuzhiyun */
11*4882a593Smuzhiyun
12*4882a593Smuzhiyun #include <linux/device.h>
13*4882a593Smuzhiyun #include <linux/io.h>
14*4882a593Smuzhiyun #include <linux/module.h>
15*4882a593Smuzhiyun #include <linux/nvmem-provider.h>
16*4882a593Smuzhiyun #include <linux/of.h>
17*4882a593Smuzhiyun #include <linux/of_device.h>
18*4882a593Smuzhiyun #include <linux/platform_device.h>
19*4882a593Smuzhiyun #include <linux/slab.h>
20*4882a593Smuzhiyun #include <linux/clk.h>
21*4882a593Smuzhiyun
22*4882a593Smuzhiyun #define IIM_BANK_BASE(n) (0x800 + 0x400 * (n))
23*4882a593Smuzhiyun
24*4882a593Smuzhiyun struct imx_iim_drvdata {
25*4882a593Smuzhiyun unsigned int nregs;
26*4882a593Smuzhiyun };
27*4882a593Smuzhiyun
28*4882a593Smuzhiyun struct iim_priv {
29*4882a593Smuzhiyun void __iomem *base;
30*4882a593Smuzhiyun struct clk *clk;
31*4882a593Smuzhiyun };
32*4882a593Smuzhiyun
imx_iim_read(void * context,unsigned int offset,void * buf,size_t bytes)33*4882a593Smuzhiyun static int imx_iim_read(void *context, unsigned int offset,
34*4882a593Smuzhiyun void *buf, size_t bytes)
35*4882a593Smuzhiyun {
36*4882a593Smuzhiyun struct iim_priv *iim = context;
37*4882a593Smuzhiyun int i, ret;
38*4882a593Smuzhiyun u8 *buf8 = buf;
39*4882a593Smuzhiyun
40*4882a593Smuzhiyun ret = clk_prepare_enable(iim->clk);
41*4882a593Smuzhiyun if (ret)
42*4882a593Smuzhiyun return ret;
43*4882a593Smuzhiyun
44*4882a593Smuzhiyun for (i = offset; i < offset + bytes; i++) {
45*4882a593Smuzhiyun int bank = i >> 5;
46*4882a593Smuzhiyun int reg = i & 0x1f;
47*4882a593Smuzhiyun
48*4882a593Smuzhiyun *buf8++ = readl(iim->base + IIM_BANK_BASE(bank) + reg * 4);
49*4882a593Smuzhiyun }
50*4882a593Smuzhiyun
51*4882a593Smuzhiyun clk_disable_unprepare(iim->clk);
52*4882a593Smuzhiyun
53*4882a593Smuzhiyun return 0;
54*4882a593Smuzhiyun }
55*4882a593Smuzhiyun
56*4882a593Smuzhiyun static struct imx_iim_drvdata imx27_drvdata = {
57*4882a593Smuzhiyun .nregs = 2 * 32,
58*4882a593Smuzhiyun };
59*4882a593Smuzhiyun
60*4882a593Smuzhiyun static struct imx_iim_drvdata imx25_imx31_imx35_drvdata = {
61*4882a593Smuzhiyun .nregs = 3 * 32,
62*4882a593Smuzhiyun };
63*4882a593Smuzhiyun
64*4882a593Smuzhiyun static struct imx_iim_drvdata imx51_drvdata = {
65*4882a593Smuzhiyun .nregs = 4 * 32,
66*4882a593Smuzhiyun };
67*4882a593Smuzhiyun
68*4882a593Smuzhiyun static struct imx_iim_drvdata imx53_drvdata = {
69*4882a593Smuzhiyun .nregs = 4 * 32 + 16,
70*4882a593Smuzhiyun };
71*4882a593Smuzhiyun
72*4882a593Smuzhiyun static const struct of_device_id imx_iim_dt_ids[] = {
73*4882a593Smuzhiyun {
74*4882a593Smuzhiyun .compatible = "fsl,imx25-iim",
75*4882a593Smuzhiyun .data = &imx25_imx31_imx35_drvdata,
76*4882a593Smuzhiyun }, {
77*4882a593Smuzhiyun .compatible = "fsl,imx27-iim",
78*4882a593Smuzhiyun .data = &imx27_drvdata,
79*4882a593Smuzhiyun }, {
80*4882a593Smuzhiyun .compatible = "fsl,imx31-iim",
81*4882a593Smuzhiyun .data = &imx25_imx31_imx35_drvdata,
82*4882a593Smuzhiyun }, {
83*4882a593Smuzhiyun .compatible = "fsl,imx35-iim",
84*4882a593Smuzhiyun .data = &imx25_imx31_imx35_drvdata,
85*4882a593Smuzhiyun }, {
86*4882a593Smuzhiyun .compatible = "fsl,imx51-iim",
87*4882a593Smuzhiyun .data = &imx51_drvdata,
88*4882a593Smuzhiyun }, {
89*4882a593Smuzhiyun .compatible = "fsl,imx53-iim",
90*4882a593Smuzhiyun .data = &imx53_drvdata,
91*4882a593Smuzhiyun }, {
92*4882a593Smuzhiyun /* sentinel */
93*4882a593Smuzhiyun },
94*4882a593Smuzhiyun };
95*4882a593Smuzhiyun MODULE_DEVICE_TABLE(of, imx_iim_dt_ids);
96*4882a593Smuzhiyun
imx_iim_probe(struct platform_device * pdev)97*4882a593Smuzhiyun static int imx_iim_probe(struct platform_device *pdev)
98*4882a593Smuzhiyun {
99*4882a593Smuzhiyun const struct of_device_id *of_id;
100*4882a593Smuzhiyun struct device *dev = &pdev->dev;
101*4882a593Smuzhiyun struct iim_priv *iim;
102*4882a593Smuzhiyun struct nvmem_device *nvmem;
103*4882a593Smuzhiyun struct nvmem_config cfg = {};
104*4882a593Smuzhiyun const struct imx_iim_drvdata *drvdata = NULL;
105*4882a593Smuzhiyun
106*4882a593Smuzhiyun iim = devm_kzalloc(dev, sizeof(*iim), GFP_KERNEL);
107*4882a593Smuzhiyun if (!iim)
108*4882a593Smuzhiyun return -ENOMEM;
109*4882a593Smuzhiyun
110*4882a593Smuzhiyun iim->base = devm_platform_ioremap_resource(pdev, 0);
111*4882a593Smuzhiyun if (IS_ERR(iim->base))
112*4882a593Smuzhiyun return PTR_ERR(iim->base);
113*4882a593Smuzhiyun
114*4882a593Smuzhiyun of_id = of_match_device(imx_iim_dt_ids, dev);
115*4882a593Smuzhiyun if (!of_id)
116*4882a593Smuzhiyun return -ENODEV;
117*4882a593Smuzhiyun
118*4882a593Smuzhiyun drvdata = of_id->data;
119*4882a593Smuzhiyun
120*4882a593Smuzhiyun iim->clk = devm_clk_get(dev, NULL);
121*4882a593Smuzhiyun if (IS_ERR(iim->clk))
122*4882a593Smuzhiyun return PTR_ERR(iim->clk);
123*4882a593Smuzhiyun
124*4882a593Smuzhiyun cfg.name = "imx-iim",
125*4882a593Smuzhiyun cfg.read_only = true,
126*4882a593Smuzhiyun cfg.word_size = 1,
127*4882a593Smuzhiyun cfg.stride = 1,
128*4882a593Smuzhiyun cfg.reg_read = imx_iim_read,
129*4882a593Smuzhiyun cfg.dev = dev;
130*4882a593Smuzhiyun cfg.size = drvdata->nregs;
131*4882a593Smuzhiyun cfg.priv = iim;
132*4882a593Smuzhiyun
133*4882a593Smuzhiyun nvmem = devm_nvmem_register(dev, &cfg);
134*4882a593Smuzhiyun
135*4882a593Smuzhiyun return PTR_ERR_OR_ZERO(nvmem);
136*4882a593Smuzhiyun }
137*4882a593Smuzhiyun
138*4882a593Smuzhiyun static struct platform_driver imx_iim_driver = {
139*4882a593Smuzhiyun .probe = imx_iim_probe,
140*4882a593Smuzhiyun .driver = {
141*4882a593Smuzhiyun .name = "imx-iim",
142*4882a593Smuzhiyun .of_match_table = imx_iim_dt_ids,
143*4882a593Smuzhiyun },
144*4882a593Smuzhiyun };
145*4882a593Smuzhiyun module_platform_driver(imx_iim_driver);
146*4882a593Smuzhiyun
147*4882a593Smuzhiyun MODULE_AUTHOR("Michael Grzeschik <m.grzeschik@pengutronix.de>");
148*4882a593Smuzhiyun MODULE_DESCRIPTION("i.MX IIM driver");
149*4882a593Smuzhiyun MODULE_LICENSE("GPL v2");
150