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 #ifdef CONFIG_SA1100_H3600
102 	pcmcia_h3600_init,
103 #endif
104 #ifdef CONFIG_SA1100_COLLIE
105        pcmcia_collie_init,
106 #endif
107 };
108 
109 static int sa11x0_drv_pcmcia_legacy_probe(struct platform_device *dev)
110 {
111 	int i, ret = -ENODEV;
112 
113 	/*
114 	 * Initialise any "on-board" PCMCIA sockets.
115 	 */
116 	for (i = 0; i < ARRAY_SIZE(sa11x0_pcmcia_legacy_hw_init); i++) {
117 		ret = sa11x0_pcmcia_legacy_hw_init[i](&dev->dev);
118 		if (ret == 0)
119 			break;
120 	}
121 
122 	return ret;
123 }
124 
125 static void sa11x0_drv_pcmcia_legacy_remove(struct platform_device *dev)
126 {
127 	struct skt_dev_info *sinfo = platform_get_drvdata(dev);
128 	int i;
129 
130 	platform_set_drvdata(dev, NULL);
131 
132 	for (i = 0; i < sinfo->nskt; i++)
133 		soc_pcmcia_remove_one(&sinfo->skt[i]);
134 }
135 
136 static int sa11x0_drv_pcmcia_probe(struct platform_device *pdev)
137 {
138 	struct soc_pcmcia_socket *skt;
139 	struct device *dev = &pdev->dev;
140 
141 	if (pdev->id == -1)
142 		return sa11x0_drv_pcmcia_legacy_probe(pdev);
143 
144 	skt = devm_kzalloc(dev, sizeof(*skt), GFP_KERNEL);
145 	if (!skt)
146 		return -ENOMEM;
147 
148 	platform_set_drvdata(pdev, skt);
149 
150 	skt->nr = pdev->id;
151 	skt->clk = devm_clk_get(dev, NULL);
152 	if (IS_ERR(skt->clk))
153 		return PTR_ERR(skt->clk);
154 
155 	sa11xx_drv_pcmcia_ops(&sa11x0_cf_ops);
156 	soc_pcmcia_init_one(skt, &sa11x0_cf_ops, dev);
157 
158 	return sa11xx_drv_pcmcia_add_one(skt);
159 }
160 
161 static int sa11x0_drv_pcmcia_remove(struct platform_device *dev)
162 {
163 	struct soc_pcmcia_socket *skt;
164 
165 	if (dev->id == -1) {
166 		sa11x0_drv_pcmcia_legacy_remove(dev);
167 		return 0;
168 	}
169 
170 	skt = platform_get_drvdata(dev);
171 
172 	soc_pcmcia_remove_one(skt);
173 
174 	return 0;
175 }
176 
177 static struct platform_driver sa11x0_pcmcia_driver = {
178 	.driver = {
179 		.name		= "sa11x0-pcmcia",
180 	},
181 	.probe		= sa11x0_drv_pcmcia_probe,
182 	.remove		= sa11x0_drv_pcmcia_remove,
183 };
184 
185 /* sa11x0_pcmcia_init()
186  * ^^^^^^^^^^^^^^^^^^^^
187  *
188  * This routine performs low-level PCMCIA initialization and then
189  * registers this socket driver with Card Services.
190  *
191  * Returns: 0 on success, -ve error code on failure
192  */
193 static int __init sa11x0_pcmcia_init(void)
194 {
195 	return platform_driver_register(&sa11x0_pcmcia_driver);
196 }
197 
198 /* sa11x0_pcmcia_exit()
199  * ^^^^^^^^^^^^^^^^^^^^
200  * Invokes the low-level kernel service to free IRQs associated with this
201  * socket controller and reset GPIO edge detection.
202  */
203 static void __exit sa11x0_pcmcia_exit(void)
204 {
205 	platform_driver_unregister(&sa11x0_pcmcia_driver);
206 }
207 
208 MODULE_AUTHOR("John Dorsey <john+@cs.cmu.edu>");
209 MODULE_DESCRIPTION("Linux PCMCIA Card Services: SA-11x0 Socket Controller");
210 MODULE_LICENSE("Dual MPL/GPL");
211 
212 fs_initcall(sa11x0_pcmcia_init);
213 module_exit(sa11x0_pcmcia_exit);
214