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
46static 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
53static 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
85static 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
91static 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
98int __init pcmcia_collie_init(struct device *dev);
99
100static 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
109static 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
125static 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
136static 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
161static void 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;
168	}
169
170	skt = platform_get_drvdata(dev);
171
172	soc_pcmcia_remove_one(skt);
173}
174
175static struct platform_driver sa11x0_pcmcia_driver = {
176	.driver = {
177		.name		= "sa11x0-pcmcia",
178	},
179	.probe		= sa11x0_drv_pcmcia_probe,
180	.remove_new	= sa11x0_drv_pcmcia_remove,
181};
182
183/* sa11x0_pcmcia_init()
184 * ^^^^^^^^^^^^^^^^^^^^
185 *
186 * This routine performs low-level PCMCIA initialization and then
187 * registers this socket driver with Card Services.
188 *
189 * Returns: 0 on success, -ve error code on failure
190 */
191static int __init sa11x0_pcmcia_init(void)
192{
193	return platform_driver_register(&sa11x0_pcmcia_driver);
194}
195
196/* sa11x0_pcmcia_exit()
197 * ^^^^^^^^^^^^^^^^^^^^
198 * Invokes the low-level kernel service to free IRQs associated with this
199 * socket controller and reset GPIO edge detection.
200 */
201static void __exit sa11x0_pcmcia_exit(void)
202{
203	platform_driver_unregister(&sa11x0_pcmcia_driver);
204}
205
206MODULE_AUTHOR("John Dorsey <john+@cs.cmu.edu>");
207MODULE_DESCRIPTION("Linux PCMCIA Card Services: SA-11x0 Socket Controller");
208MODULE_LICENSE("Dual MPL/GPL");
209
210fs_initcall(sa11x0_pcmcia_init);
211module_exit(sa11x0_pcmcia_exit);
212