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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * ARM PL353 SMC driver
4 *
5 * Copyright (C) 2012 - 2018 Xilinx, Inc
6 * Author: Punnaiah Choudary Kalluri <punnaiah@xilinx.com>
7 * Author: Naga Sureshkumar Relli <nagasure@xilinx.com>
8 */
9
10#include <linux/clk.h>
11#include <linux/kernel.h>
12#include <linux/module.h>
13#include <linux/of.h>
14#include <linux/of_platform.h>
15#include <linux/platform_device.h>
16#include <linux/amba/bus.h>
17
18/**
19 * struct pl353_smc_data - Private smc driver structure
20 * @memclk: Pointer to the peripheral clock
21 * @aclk: Pointer to the AXI peripheral clock
22 */
23struct pl353_smc_data {
24 struct clk *memclk;
25 struct clk *aclk;
26};
27
28static int __maybe_unused pl353_smc_suspend(struct device *dev)
29{
30 struct pl353_smc_data *pl353_smc = dev_get_drvdata(dev);
31
32 clk_disable(pl353_smc->memclk);
33 clk_disable(pl353_smc->aclk);
34
35 return 0;
36}
37
38static int __maybe_unused pl353_smc_resume(struct device *dev)
39{
40 struct pl353_smc_data *pl353_smc = dev_get_drvdata(dev);
41 int ret;
42
43 ret = clk_enable(pl353_smc->aclk);
44 if (ret) {
45 dev_err(dev, "Cannot enable axi domain clock.\n");
46 return ret;
47 }
48
49 ret = clk_enable(pl353_smc->memclk);
50 if (ret) {
51 dev_err(dev, "Cannot enable memory clock.\n");
52 clk_disable(pl353_smc->aclk);
53 return ret;
54 }
55
56 return ret;
57}
58
59static SIMPLE_DEV_PM_OPS(pl353_smc_dev_pm_ops, pl353_smc_suspend,
60 pl353_smc_resume);
61
62static const struct of_device_id pl353_smc_supported_children[] = {
63 {
64 .compatible = "cfi-flash"
65 },
66 {
67 .compatible = "arm,pl353-nand-r2p1",
68 },
69 {}
70};
71
72static int pl353_smc_probe(struct amba_device *adev, const struct amba_id *id)
73{
74 struct device_node *of_node = adev->dev.of_node;
75 const struct of_device_id *match = NULL;
76 struct pl353_smc_data *pl353_smc;
77
78 pl353_smc = devm_kzalloc(&adev->dev, sizeof(*pl353_smc), GFP_KERNEL);
79 if (!pl353_smc)
80 return -ENOMEM;
81
82 pl353_smc->aclk = devm_clk_get_enabled(&adev->dev, "apb_pclk");
83 if (IS_ERR(pl353_smc->aclk))
84 return dev_err_probe(&adev->dev, PTR_ERR(pl353_smc->aclk),
85 "aclk clock not found.\n");
86
87 pl353_smc->memclk = devm_clk_get_enabled(&adev->dev, "memclk");
88 if (IS_ERR(pl353_smc->memclk))
89 return dev_err_probe(&adev->dev, PTR_ERR(pl353_smc->memclk),
90 "memclk clock not found.\n");
91
92 amba_set_drvdata(adev, pl353_smc);
93
94 /* Find compatible children. Only a single child is supported */
95 for_each_available_child_of_node_scoped(of_node, child) {
96 match = of_match_node(pl353_smc_supported_children, child);
97 if (!match) {
98 dev_warn(&adev->dev, "unsupported child node\n");
99 continue;
100 }
101 of_platform_device_create(child, NULL, &adev->dev);
102 break;
103 }
104 if (!match) {
105 dev_err(&adev->dev, "no matching children\n");
106 return -ENODEV;
107 }
108
109 return 0;
110}
111
112static const struct amba_id pl353_ids[] = {
113 {
114 .id = 0x00041353,
115 .mask = 0x000fffff,
116 },
117 { 0, 0 },
118};
119MODULE_DEVICE_TABLE(amba, pl353_ids);
120
121static struct amba_driver pl353_smc_driver = {
122 .drv = {
123 .name = "pl353-smc",
124 .pm = &pl353_smc_dev_pm_ops,
125 },
126 .id_table = pl353_ids,
127 .probe = pl353_smc_probe,
128};
129
130module_amba_driver(pl353_smc_driver);
131
132MODULE_AUTHOR("Xilinx, Inc.");
133MODULE_DESCRIPTION("ARM PL353 SMC Driver");
134MODULE_LICENSE("GPL");
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * ARM PL353 SMC driver
4 *
5 * Copyright (C) 2012 - 2018 Xilinx, Inc
6 * Author: Punnaiah Choudary Kalluri <punnaiah@xilinx.com>
7 * Author: Naga Sureshkumar Relli <nagasure@xilinx.com>
8 */
9
10#include <linux/clk.h>
11#include <linux/kernel.h>
12#include <linux/module.h>
13#include <linux/of_platform.h>
14#include <linux/platform_device.h>
15#include <linux/amba/bus.h>
16
17/**
18 * struct pl353_smc_data - Private smc driver structure
19 * @memclk: Pointer to the peripheral clock
20 * @aclk: Pointer to the AXI peripheral clock
21 */
22struct pl353_smc_data {
23 struct clk *memclk;
24 struct clk *aclk;
25};
26
27static int __maybe_unused pl353_smc_suspend(struct device *dev)
28{
29 struct pl353_smc_data *pl353_smc = dev_get_drvdata(dev);
30
31 clk_disable(pl353_smc->memclk);
32 clk_disable(pl353_smc->aclk);
33
34 return 0;
35}
36
37static int __maybe_unused pl353_smc_resume(struct device *dev)
38{
39 struct pl353_smc_data *pl353_smc = dev_get_drvdata(dev);
40 int ret;
41
42 ret = clk_enable(pl353_smc->aclk);
43 if (ret) {
44 dev_err(dev, "Cannot enable axi domain clock.\n");
45 return ret;
46 }
47
48 ret = clk_enable(pl353_smc->memclk);
49 if (ret) {
50 dev_err(dev, "Cannot enable memory clock.\n");
51 clk_disable(pl353_smc->aclk);
52 return ret;
53 }
54
55 return ret;
56}
57
58static SIMPLE_DEV_PM_OPS(pl353_smc_dev_pm_ops, pl353_smc_suspend,
59 pl353_smc_resume);
60
61static const struct of_device_id pl353_smc_supported_children[] = {
62 {
63 .compatible = "cfi-flash"
64 },
65 {
66 .compatible = "arm,pl353-nand-r2p1",
67 },
68 {}
69};
70
71static int pl353_smc_probe(struct amba_device *adev, const struct amba_id *id)
72{
73 struct device_node *of_node = adev->dev.of_node;
74 const struct of_device_id *match = NULL;
75 struct pl353_smc_data *pl353_smc;
76 struct device_node *child;
77 int err;
78
79 pl353_smc = devm_kzalloc(&adev->dev, sizeof(*pl353_smc), GFP_KERNEL);
80 if (!pl353_smc)
81 return -ENOMEM;
82
83 pl353_smc->aclk = devm_clk_get(&adev->dev, "apb_pclk");
84 if (IS_ERR(pl353_smc->aclk)) {
85 dev_err(&adev->dev, "aclk clock not found.\n");
86 return PTR_ERR(pl353_smc->aclk);
87 }
88
89 pl353_smc->memclk = devm_clk_get(&adev->dev, "memclk");
90 if (IS_ERR(pl353_smc->memclk)) {
91 dev_err(&adev->dev, "memclk clock not found.\n");
92 return PTR_ERR(pl353_smc->memclk);
93 }
94
95 err = clk_prepare_enable(pl353_smc->aclk);
96 if (err) {
97 dev_err(&adev->dev, "Unable to enable AXI clock.\n");
98 return err;
99 }
100
101 err = clk_prepare_enable(pl353_smc->memclk);
102 if (err) {
103 dev_err(&adev->dev, "Unable to enable memory clock.\n");
104 goto disable_axi_clk;
105 }
106
107 amba_set_drvdata(adev, pl353_smc);
108
109 /* Find compatible children. Only a single child is supported */
110 for_each_available_child_of_node(of_node, child) {
111 match = of_match_node(pl353_smc_supported_children, child);
112 if (!match) {
113 dev_warn(&adev->dev, "unsupported child node\n");
114 continue;
115 }
116 break;
117 }
118 if (!match) {
119 err = -ENODEV;
120 dev_err(&adev->dev, "no matching children\n");
121 goto disable_mem_clk;
122 }
123
124 of_platform_device_create(child, NULL, &adev->dev);
125
126 return 0;
127
128disable_mem_clk:
129 clk_disable_unprepare(pl353_smc->memclk);
130disable_axi_clk:
131 clk_disable_unprepare(pl353_smc->aclk);
132
133 return err;
134}
135
136static void pl353_smc_remove(struct amba_device *adev)
137{
138 struct pl353_smc_data *pl353_smc = amba_get_drvdata(adev);
139
140 clk_disable_unprepare(pl353_smc->memclk);
141 clk_disable_unprepare(pl353_smc->aclk);
142}
143
144static const struct amba_id pl353_ids[] = {
145 {
146 .id = 0x00041353,
147 .mask = 0x000fffff,
148 },
149 { 0, 0 },
150};
151MODULE_DEVICE_TABLE(amba, pl353_ids);
152
153static struct amba_driver pl353_smc_driver = {
154 .drv = {
155 .owner = THIS_MODULE,
156 .name = "pl353-smc",
157 .pm = &pl353_smc_dev_pm_ops,
158 },
159 .id_table = pl353_ids,
160 .probe = pl353_smc_probe,
161 .remove = pl353_smc_remove,
162};
163
164module_amba_driver(pl353_smc_driver);
165
166MODULE_AUTHOR("Xilinx, Inc.");
167MODULE_DESCRIPTION("ARM PL353 SMC Driver");
168MODULE_LICENSE("GPL");