1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* |
3 | * Copyright 2015 Toradex AG |
4 | * |
5 | * Stefan Agner <stefan@agner.ch> |
6 | * |
7 | * Freescale TCON device driver |
8 | */ |
9 | |
10 | #include <linux/clk.h> |
11 | #include <linux/io.h> |
12 | #include <linux/mm.h> |
13 | #include <linux/of_address.h> |
14 | #include <linux/platform_device.h> |
15 | #include <linux/regmap.h> |
16 | |
17 | #include "fsl_tcon.h" |
18 | |
19 | void fsl_tcon_bypass_disable(struct fsl_tcon *tcon) |
20 | { |
21 | regmap_update_bits(map: tcon->regs, FSL_TCON_CTRL1, |
22 | FSL_TCON_CTRL1_TCON_BYPASS, val: 0); |
23 | } |
24 | |
25 | void fsl_tcon_bypass_enable(struct fsl_tcon *tcon) |
26 | { |
27 | regmap_update_bits(map: tcon->regs, FSL_TCON_CTRL1, |
28 | FSL_TCON_CTRL1_TCON_BYPASS, |
29 | FSL_TCON_CTRL1_TCON_BYPASS); |
30 | } |
31 | |
32 | static struct regmap_config fsl_tcon_regmap_config = { |
33 | .reg_bits = 32, |
34 | .reg_stride = 4, |
35 | .val_bits = 32, |
36 | |
37 | .name = "tcon" , |
38 | }; |
39 | |
40 | static int fsl_tcon_init_regmap(struct device *dev, |
41 | struct fsl_tcon *tcon, |
42 | struct device_node *np) |
43 | { |
44 | struct resource res; |
45 | void __iomem *regs; |
46 | |
47 | if (of_address_to_resource(dev: np, index: 0, r: &res)) |
48 | return -EINVAL; |
49 | |
50 | regs = devm_ioremap_resource(dev, res: &res); |
51 | if (IS_ERR(ptr: regs)) |
52 | return PTR_ERR(ptr: regs); |
53 | |
54 | tcon->regs = devm_regmap_init_mmio(dev, regs, |
55 | &fsl_tcon_regmap_config); |
56 | return PTR_ERR_OR_ZERO(ptr: tcon->regs); |
57 | } |
58 | |
59 | struct fsl_tcon *fsl_tcon_init(struct device *dev) |
60 | { |
61 | struct fsl_tcon *tcon; |
62 | struct device_node *np; |
63 | int ret; |
64 | |
65 | /* TCON node is not mandatory, some devices do not provide TCON */ |
66 | np = of_parse_phandle(np: dev->of_node, phandle_name: "fsl,tcon" , index: 0); |
67 | if (!np) |
68 | return NULL; |
69 | |
70 | tcon = devm_kzalloc(dev, size: sizeof(*tcon), GFP_KERNEL); |
71 | if (!tcon) |
72 | goto err_node_put; |
73 | |
74 | ret = fsl_tcon_init_regmap(dev, tcon, np); |
75 | if (ret) { |
76 | dev_err(dev, "Couldn't create the TCON regmap\n" ); |
77 | goto err_node_put; |
78 | } |
79 | |
80 | tcon->ipg_clk = of_clk_get_by_name(np, name: "ipg" ); |
81 | if (IS_ERR(ptr: tcon->ipg_clk)) { |
82 | dev_err(dev, "Couldn't get the TCON bus clock\n" ); |
83 | goto err_node_put; |
84 | } |
85 | |
86 | ret = clk_prepare_enable(clk: tcon->ipg_clk); |
87 | if (ret) { |
88 | dev_err(dev, "Couldn't enable the TCON clock\n" ); |
89 | goto err_node_put; |
90 | } |
91 | |
92 | of_node_put(node: np); |
93 | dev_info(dev, "Using TCON in bypass mode\n" ); |
94 | |
95 | return tcon; |
96 | |
97 | err_node_put: |
98 | of_node_put(node: np); |
99 | return NULL; |
100 | } |
101 | |
102 | void fsl_tcon_free(struct fsl_tcon *tcon) |
103 | { |
104 | clk_disable_unprepare(clk: tcon->ipg_clk); |
105 | clk_put(clk: tcon->ipg_clk); |
106 | } |
107 | |
108 | |