1 /*======================================================================
2 
3     Device driver for the PCMCIA control functionality of StrongARM
4     SA-1100 microprocessors.
5 
6     The contents of this file are subject to the Mozilla Public
7     License Version 1.1 (the "License"); you may not use this file
8     except in compliance with the License. You may obtain a copy of
9     the License at http://www.mozilla.org/MPL/
10 
11     Software distributed under the License is distributed on an "AS
12     IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
13     implied. See the License for the specific language governing
14     rights and limitations under the License.
15 
16     The initial developer of the original code is John G. Dorsey
17     <john+@cs.cmu.edu>.  Portions created by John G. Dorsey are
18     Copyright (C) 1999 John G. Dorsey.  All Rights Reserved.
19 
20     Alternatively, the contents of this file may be used under the
21     terms of the GNU Public License version 2 (the "GPL"), in which
22     case the provisions of the GPL are applicable instead of the
23     above.  If you wish to allow the use of your version of this file
24     only under the terms of the GPL and not to allow others to use
25     your version of this file under the MPL, indicate your decision
26     by deleting the provisions above and replace them with the notice
27     and other provisions required by the GPL.  If you do not delete
28     the provisions above, a recipient may use your version of this
29     file under either the MPL or the GPL.
30 
31 ======================================================================*/
32 
33 #include <linux/module.h>
34 #include <linux/gpio/consumer.h>
35 #include <linux/init.h>
36 #include <linux/regulator/consumer.h>
37 #include <linux/slab.h>
38 #include <linux/platform_device.h>
39 
40 #include <pcmcia/ss.h>
41 
42 #include <asm/hardware/scoop.h>
43 
44 #include "sa1100_generic.h"
45 
46 static const char *sa11x0_cf_gpio_names[] = {
47 	[SOC_STAT_CD] = "detect",
48 	[SOC_STAT_BVD1] = "bvd1",
49 	[SOC_STAT_BVD2] = "bvd2",
50 	[SOC_STAT_RDY] = "ready",
51 };
52 
53 static int sa11x0_cf_hw_init(struct soc_pcmcia_socket *skt)
54 {
55 	struct device *dev = skt->socket.dev.parent;
56 	int i;
57 
58 	skt->gpio_reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
59 	if (IS_ERR(skt->gpio_reset))
60 		return PTR_ERR(skt->gpio_reset);
61 
62 	skt->gpio_bus_enable = devm_gpiod_get_optional(dev, "bus-enable",
63 						       GPIOD_OUT_HIGH);
64 	if (IS_ERR(skt->gpio_bus_enable))
65 		return PTR_ERR(skt->gpio_bus_enable);
66 
67 	skt->vcc.reg = devm_regulator_get_optional(dev, "vcc");
68 	if (IS_ERR(skt->vcc.reg))
69 		return PTR_ERR(skt->vcc.reg);
70 
71 	if (!skt->vcc.reg)
72 		dev_warn(dev,
73 			 "no Vcc regulator provided, ignoring Vcc controls\n");
74 
75 	for (i = 0; i < ARRAY_SIZE(sa11x0_cf_gpio_names); i++) {
76 		skt->stat[i].name = sa11x0_cf_gpio_names[i];
77 		skt->stat[i].desc = devm_gpiod_get_optional(dev,
78 					sa11x0_cf_gpio_names[i], GPIOD_IN);
79 		if (IS_ERR(skt->stat[i].desc))
80 			return PTR_ERR(skt->stat[i].desc);
81 	}
82 	return 0;
83 }
84 
85 static int sa11x0_cf_configure_socket(struct soc_pcmcia_socket *skt,
86 	const socket_state_t *state)
87 {
88 	return soc_pcmcia_regulator_set(skt, &skt->vcc, state->Vcc);
89 }
90 
91 static struct pcmcia_low_level sa11x0_cf_ops = {
92 	.owner = THIS_MODULE,
93 	.hw_init = sa11x0_cf_hw_init,
94 	.socket_state = soc_common_cf_socket_state,
95 	.configure_socket = sa11x0_cf_configure_socket,
96 };
97 
98 int __init pcmcia_collie_init(struct device *dev);
99 
100 static int (*sa11x0_pcmcia_legacy_hw_init[])(struct device *dev) = {
101 #if defined(CONFIG_SA1100_H3100) || defined(CONFIG_SA1100_H3600)
102 	pcmcia_h3600_init,
103 #endif
104 #ifdef CONFIG_SA1100_SIMPAD
105 	pcmcia_simpad_init,
106 #endif
107 #ifdef CONFIG_SA1100_COLLIE
108        pcmcia_collie_init,
109 #endif
110 };
111 
112 static int sa11x0_drv_pcmcia_legacy_probe(struct platform_device *dev)
113 {
114 	int i, ret = -ENODEV;
115 
116 	/*
117 	 * Initialise any "on-board" PCMCIA sockets.
118 	 */
119 	for (i = 0; i < ARRAY_SIZE(sa11x0_pcmcia_legacy_hw_init); i++) {
120 		ret = sa11x0_pcmcia_legacy_hw_init[i](&dev->dev);
121 		if (ret == 0)
122 			break;
123 	}
124 
125 	return ret;
126 }
127 
128 static int sa11x0_drv_pcmcia_legacy_remove(struct platform_device *dev)
129 {
130 	struct skt_dev_info *sinfo = platform_get_drvdata(dev);
131 	int i;
132 
133 	platform_set_drvdata(dev, NULL);
134 
135 	for (i = 0; i < sinfo->nskt; i++)
136 		soc_pcmcia_remove_one(&sinfo->skt[i]);
137 
138 	return 0;
139 }
140 
141 static int sa11x0_drv_pcmcia_probe(struct platform_device *pdev)
142 {
143 	struct soc_pcmcia_socket *skt;
144 	struct device *dev = &pdev->dev;
145 
146 	if (pdev->id == -1)
147 		return sa11x0_drv_pcmcia_legacy_probe(pdev);
148 
149 	skt = devm_kzalloc(dev, sizeof(*skt), GFP_KERNEL);
150 	if (!skt)
151 		return -ENOMEM;
152 
153 	platform_set_drvdata(pdev, skt);
154 
155 	skt->nr = pdev->id;
156 	skt->clk = devm_clk_get(dev, NULL);
157 	if (IS_ERR(skt->clk))
158 		return PTR_ERR(skt->clk);
159 
160 	sa11xx_drv_pcmcia_ops(&sa11x0_cf_ops);
161 	soc_pcmcia_init_one(skt, &sa11x0_cf_ops, dev);
162 
163 	return sa11xx_drv_pcmcia_add_one(skt);
164 }
165 
166 static int sa11x0_drv_pcmcia_remove(struct platform_device *dev)
167 {
168 	struct soc_pcmcia_socket *skt;
169 
170 	if (dev->id == -1)
171 		return sa11x0_drv_pcmcia_legacy_remove(dev);
172 
173 	skt = platform_get_drvdata(dev);
174 
175 	soc_pcmcia_remove_one(skt);
176 
177 	return 0;
178 }
179 
180 static struct platform_driver sa11x0_pcmcia_driver = {
181 	.driver = {
182 		.name		= "sa11x0-pcmcia",
183 	},
184 	.probe		= sa11x0_drv_pcmcia_probe,
185 	.remove		= sa11x0_drv_pcmcia_remove,
186 };
187 
188 /* sa11x0_pcmcia_init()
189  * ^^^^^^^^^^^^^^^^^^^^
190  *
191  * This routine performs low-level PCMCIA initialization and then
192  * registers this socket driver with Card Services.
193  *
194  * Returns: 0 on success, -ve error code on failure
195  */
196 static int __init sa11x0_pcmcia_init(void)
197 {
198 	return platform_driver_register(&sa11x0_pcmcia_driver);
199 }
200 
201 /* sa11x0_pcmcia_exit()
202  * ^^^^^^^^^^^^^^^^^^^^
203  * Invokes the low-level kernel service to free IRQs associated with this
204  * socket controller and reset GPIO edge detection.
205  */
206 static void __exit sa11x0_pcmcia_exit(void)
207 {
208 	platform_driver_unregister(&sa11x0_pcmcia_driver);
209 }
210 
211 MODULE_AUTHOR("John Dorsey <john+@cs.cmu.edu>");
212 MODULE_DESCRIPTION("Linux PCMCIA Card Services: SA-11x0 Socket Controller");
213 MODULE_LICENSE("Dual MPL/GPL");
214 
215 fs_initcall(sa11x0_pcmcia_init);
216 module_exit(sa11x0_pcmcia_exit);
217