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1/*
2 * Copyright (C) 2014 Free Electrons
3 * Copyright (C) 2014 Atmel
4 *
5 * Author: Boris BREZILLON <boris.brezillon@free-electrons.com>
6 *
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License version 2 as published by
9 * the Free Software Foundation.
10 *
11 * This program is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
14 * more details.
15 *
16 * You should have received a copy of the GNU General Public License along with
17 * this program. If not, see <http://www.gnu.org/licenses/>.
18 */
19
20#include <linux/clk.h>
21#include <linux/iopoll.h>
22#include <linux/mfd/atmel-hlcdc.h>
23#include <linux/mfd/core.h>
24#include <linux/module.h>
25#include <linux/platform_device.h>
26#include <linux/regmap.h>
27
28#define ATMEL_HLCDC_REG_MAX (0x4000 - 0x4)
29
30struct atmel_hlcdc_regmap {
31 void __iomem *regs;
32};
33
34static const struct mfd_cell atmel_hlcdc_cells[] = {
35 {
36 .name = "atmel-hlcdc-pwm",
37 .of_compatible = "atmel,hlcdc-pwm",
38 },
39 {
40 .name = "atmel-hlcdc-dc",
41 .of_compatible = "atmel,hlcdc-display-controller",
42 },
43};
44
45static int regmap_atmel_hlcdc_reg_write(void *context, unsigned int reg,
46 unsigned int val)
47{
48 struct atmel_hlcdc_regmap *hregmap = context;
49
50 if (reg <= ATMEL_HLCDC_DIS) {
51 u32 status;
52
53 readl_poll_timeout(hregmap->regs + ATMEL_HLCDC_SR, status,
54 !(status & ATMEL_HLCDC_SIP), 1, 100);
55 }
56
57 writel(val, hregmap->regs + reg);
58
59 return 0;
60}
61
62static int regmap_atmel_hlcdc_reg_read(void *context, unsigned int reg,
63 unsigned int *val)
64{
65 struct atmel_hlcdc_regmap *hregmap = context;
66
67 *val = readl(hregmap->regs + reg);
68
69 return 0;
70}
71
72static const struct regmap_config atmel_hlcdc_regmap_config = {
73 .reg_bits = 32,
74 .val_bits = 32,
75 .reg_stride = 4,
76 .max_register = ATMEL_HLCDC_REG_MAX,
77 .reg_write = regmap_atmel_hlcdc_reg_write,
78 .reg_read = regmap_atmel_hlcdc_reg_read,
79 .fast_io = true,
80};
81
82static int atmel_hlcdc_probe(struct platform_device *pdev)
83{
84 struct atmel_hlcdc_regmap *hregmap;
85 struct device *dev = &pdev->dev;
86 struct atmel_hlcdc *hlcdc;
87 struct resource *res;
88
89 hregmap = devm_kzalloc(dev, sizeof(*hregmap), GFP_KERNEL);
90 if (!hregmap)
91 return -ENOMEM;
92
93 hlcdc = devm_kzalloc(dev, sizeof(*hlcdc), GFP_KERNEL);
94 if (!hlcdc)
95 return -ENOMEM;
96
97 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
98 hregmap->regs = devm_ioremap_resource(dev, res);
99 if (IS_ERR(hregmap->regs))
100 return PTR_ERR(hregmap->regs);
101
102 hlcdc->irq = platform_get_irq(pdev, 0);
103 if (hlcdc->irq < 0)
104 return hlcdc->irq;
105
106 hlcdc->periph_clk = devm_clk_get(dev, "periph_clk");
107 if (IS_ERR(hlcdc->periph_clk)) {
108 dev_err(dev, "failed to get peripheral clock\n");
109 return PTR_ERR(hlcdc->periph_clk);
110 }
111
112 hlcdc->sys_clk = devm_clk_get(dev, "sys_clk");
113 if (IS_ERR(hlcdc->sys_clk)) {
114 dev_err(dev, "failed to get system clock\n");
115 return PTR_ERR(hlcdc->sys_clk);
116 }
117
118 hlcdc->slow_clk = devm_clk_get(dev, "slow_clk");
119 if (IS_ERR(hlcdc->slow_clk)) {
120 dev_err(dev, "failed to get slow clock\n");
121 return PTR_ERR(hlcdc->slow_clk);
122 }
123
124 hlcdc->regmap = devm_regmap_init(dev, NULL, hregmap,
125 &atmel_hlcdc_regmap_config);
126 if (IS_ERR(hlcdc->regmap))
127 return PTR_ERR(hlcdc->regmap);
128
129 dev_set_drvdata(dev, hlcdc);
130
131 return mfd_add_devices(dev, -1, atmel_hlcdc_cells,
132 ARRAY_SIZE(atmel_hlcdc_cells),
133 NULL, 0, NULL);
134}
135
136static int atmel_hlcdc_remove(struct platform_device *pdev)
137{
138 mfd_remove_devices(&pdev->dev);
139
140 return 0;
141}
142
143static const struct of_device_id atmel_hlcdc_match[] = {
144 { .compatible = "atmel,at91sam9n12-hlcdc" },
145 { .compatible = "atmel,at91sam9x5-hlcdc" },
146 { .compatible = "atmel,sama5d2-hlcdc" },
147 { .compatible = "atmel,sama5d3-hlcdc" },
148 { .compatible = "atmel,sama5d4-hlcdc" },
149 { /* sentinel */ },
150};
151MODULE_DEVICE_TABLE(of, atmel_hlcdc_match);
152
153static struct platform_driver atmel_hlcdc_driver = {
154 .probe = atmel_hlcdc_probe,
155 .remove = atmel_hlcdc_remove,
156 .driver = {
157 .name = "atmel-hlcdc",
158 .of_match_table = atmel_hlcdc_match,
159 },
160};
161module_platform_driver(atmel_hlcdc_driver);
162
163MODULE_ALIAS("platform:atmel-hlcdc");
164MODULE_AUTHOR("Boris Brezillon <boris.brezillon@free-electrons.com>");
165MODULE_DESCRIPTION("Atmel HLCDC driver");
166MODULE_LICENSE("GPL v2");
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2014 Free Electrons
4 * Copyright (C) 2014 Atmel
5 *
6 * Author: Boris BREZILLON <boris.brezillon@free-electrons.com>
7 */
8
9#include <linux/clk.h>
10#include <linux/iopoll.h>
11#include <linux/mfd/atmel-hlcdc.h>
12#include <linux/mfd/core.h>
13#include <linux/module.h>
14#include <linux/mod_devicetable.h>
15#include <linux/platform_device.h>
16#include <linux/regmap.h>
17
18#define ATMEL_HLCDC_REG_MAX (0x4000 - 0x4)
19
20struct atmel_hlcdc_regmap {
21 void __iomem *regs;
22 struct device *dev;
23};
24
25static const struct mfd_cell atmel_hlcdc_cells[] = {
26 {
27 .name = "atmel-hlcdc-pwm",
28 .of_compatible = "atmel,hlcdc-pwm",
29 },
30 {
31 .name = "atmel-hlcdc-dc",
32 .of_compatible = "atmel,hlcdc-display-controller",
33 },
34};
35
36static int regmap_atmel_hlcdc_reg_write(void *context, unsigned int reg,
37 unsigned int val)
38{
39 struct atmel_hlcdc_regmap *hregmap = context;
40
41 if (reg <= ATMEL_HLCDC_DIS) {
42 u32 status;
43 int ret;
44
45 ret = readl_poll_timeout_atomic(hregmap->regs + ATMEL_HLCDC_SR,
46 status,
47 !(status & ATMEL_HLCDC_SIP),
48 1, 100);
49 if (ret) {
50 dev_err(hregmap->dev,
51 "Timeout! Clock domain synchronization is in progress!\n");
52 return ret;
53 }
54 }
55
56 writel(val, hregmap->regs + reg);
57
58 return 0;
59}
60
61static int regmap_atmel_hlcdc_reg_read(void *context, unsigned int reg,
62 unsigned int *val)
63{
64 struct atmel_hlcdc_regmap *hregmap = context;
65
66 *val = readl(hregmap->regs + reg);
67
68 return 0;
69}
70
71static const struct regmap_config atmel_hlcdc_regmap_config = {
72 .reg_bits = 32,
73 .val_bits = 32,
74 .reg_stride = 4,
75 .max_register = ATMEL_HLCDC_REG_MAX,
76 .reg_write = regmap_atmel_hlcdc_reg_write,
77 .reg_read = regmap_atmel_hlcdc_reg_read,
78 .fast_io = true,
79};
80
81static int atmel_hlcdc_probe(struct platform_device *pdev)
82{
83 struct atmel_hlcdc_regmap *hregmap;
84 struct device *dev = &pdev->dev;
85 struct atmel_hlcdc *hlcdc;
86 struct resource *res;
87
88 hregmap = devm_kzalloc(dev, sizeof(*hregmap), GFP_KERNEL);
89 if (!hregmap)
90 return -ENOMEM;
91
92 hlcdc = devm_kzalloc(dev, sizeof(*hlcdc), GFP_KERNEL);
93 if (!hlcdc)
94 return -ENOMEM;
95
96 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
97 hregmap->regs = devm_ioremap_resource(dev, res);
98 if (IS_ERR(hregmap->regs))
99 return PTR_ERR(hregmap->regs);
100
101 hregmap->dev = &pdev->dev;
102
103 hlcdc->irq = platform_get_irq(pdev, 0);
104 if (hlcdc->irq < 0)
105 return hlcdc->irq;
106
107 hlcdc->periph_clk = devm_clk_get(dev, "periph_clk");
108 if (IS_ERR(hlcdc->periph_clk)) {
109 dev_err(dev, "failed to get peripheral clock\n");
110 return PTR_ERR(hlcdc->periph_clk);
111 }
112
113 hlcdc->sys_clk = devm_clk_get(dev, "sys_clk");
114 if (IS_ERR(hlcdc->sys_clk)) {
115 dev_err(dev, "failed to get system clock\n");
116 return PTR_ERR(hlcdc->sys_clk);
117 }
118
119 hlcdc->slow_clk = devm_clk_get(dev, "slow_clk");
120 if (IS_ERR(hlcdc->slow_clk)) {
121 dev_err(dev, "failed to get slow clock\n");
122 return PTR_ERR(hlcdc->slow_clk);
123 }
124
125 hlcdc->regmap = devm_regmap_init(dev, NULL, hregmap,
126 &atmel_hlcdc_regmap_config);
127 if (IS_ERR(hlcdc->regmap))
128 return PTR_ERR(hlcdc->regmap);
129
130 dev_set_drvdata(dev, hlcdc);
131
132 return devm_mfd_add_devices(dev, -1, atmel_hlcdc_cells,
133 ARRAY_SIZE(atmel_hlcdc_cells),
134 NULL, 0, NULL);
135}
136
137static const struct of_device_id atmel_hlcdc_match[] = {
138 { .compatible = "atmel,at91sam9n12-hlcdc" },
139 { .compatible = "atmel,at91sam9x5-hlcdc" },
140 { .compatible = "atmel,sama5d2-hlcdc" },
141 { .compatible = "atmel,sama5d3-hlcdc" },
142 { .compatible = "atmel,sama5d4-hlcdc" },
143 { .compatible = "microchip,sam9x60-hlcdc" },
144 { /* sentinel */ },
145};
146MODULE_DEVICE_TABLE(of, atmel_hlcdc_match);
147
148static struct platform_driver atmel_hlcdc_driver = {
149 .probe = atmel_hlcdc_probe,
150 .driver = {
151 .name = "atmel-hlcdc",
152 .of_match_table = atmel_hlcdc_match,
153 },
154};
155module_platform_driver(atmel_hlcdc_driver);
156
157MODULE_ALIAS("platform:atmel-hlcdc");
158MODULE_AUTHOR("Boris Brezillon <boris.brezillon@free-electrons.com>");
159MODULE_DESCRIPTION("Atmel HLCDC driver");
160MODULE_LICENSE("GPL v2");