1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * linux/drivers/pcmcia/pxa2xx_stargate2.c
4 *
5 * Stargate 2 PCMCIA specific routines.
6 *
7 * Created: December 6, 2005
8 * Author: Ed C. Epp
9 * Copyright: Intel Corp 2005
10 * Jonathan Cameron <jic23@cam.ac.uk> 2009
11 */
12
13 #include <linux/module.h>
14 #include <linux/init.h>
15 #include <linux/kernel.h>
16 #include <linux/interrupt.h>
17 #include <linux/delay.h>
18 #include <linux/platform_device.h>
19 #include <linux/gpio.h>
20
21 #include <pcmcia/ss.h>
22
23 #include <asm/irq.h>
24 #include <asm/mach-types.h>
25
26 #include "soc_common.h"
27
28 #define SG2_S0_POWER_CTL 108
29 #define SG2_S0_GPIO_RESET 82
30 #define SG2_S0_GPIO_DETECT 53
31 #define SG2_S0_GPIO_READY 81
32
33 static struct gpio sg2_pcmcia_gpios[] = {
34 { SG2_S0_GPIO_RESET, GPIOF_OUT_INIT_HIGH, "PCMCIA Reset" },
35 { SG2_S0_POWER_CTL, GPIOF_OUT_INIT_HIGH, "PCMCIA Power Ctrl" },
36 };
37
sg2_pcmcia_hw_init(struct soc_pcmcia_socket * skt)38 static int sg2_pcmcia_hw_init(struct soc_pcmcia_socket *skt)
39 {
40 skt->stat[SOC_STAT_CD].gpio = SG2_S0_GPIO_DETECT;
41 skt->stat[SOC_STAT_CD].name = "PCMCIA0 CD";
42 skt->stat[SOC_STAT_RDY].gpio = SG2_S0_GPIO_READY;
43 skt->stat[SOC_STAT_RDY].name = "PCMCIA0 RDY";
44 return 0;
45 }
46
sg2_pcmcia_socket_state(struct soc_pcmcia_socket * skt,struct pcmcia_state * state)47 static void sg2_pcmcia_socket_state(struct soc_pcmcia_socket *skt,
48 struct pcmcia_state *state)
49 {
50 state->bvd1 = 0; /* not available - battery detect on card */
51 state->bvd2 = 0; /* not available */
52 state->vs_3v = 1; /* not available - voltage detect for card */
53 state->vs_Xv = 0; /* not available */
54 }
55
sg2_pcmcia_configure_socket(struct soc_pcmcia_socket * skt,const socket_state_t * state)56 static int sg2_pcmcia_configure_socket(struct soc_pcmcia_socket *skt,
57 const socket_state_t *state)
58 {
59 /* Enable card power */
60 switch (state->Vcc) {
61 case 0:
62 /* sets power ctl register high */
63 gpio_set_value(SG2_S0_POWER_CTL, 1);
64 break;
65 case 33:
66 case 50:
67 /* sets power control register low (clear) */
68 gpio_set_value(SG2_S0_POWER_CTL, 0);
69 msleep(100);
70 break;
71 default:
72 pr_err("%s(): bad Vcc %u\n",
73 __func__, state->Vcc);
74 return -1;
75 }
76
77 /* reset */
78 gpio_set_value(SG2_S0_GPIO_RESET, !!(state->flags & SS_RESET));
79
80 return 0;
81 }
82
83 static struct pcmcia_low_level sg2_pcmcia_ops __initdata = {
84 .owner = THIS_MODULE,
85 .hw_init = sg2_pcmcia_hw_init,
86 .socket_state = sg2_pcmcia_socket_state,
87 .configure_socket = sg2_pcmcia_configure_socket,
88 .nr = 1,
89 };
90
91 static struct platform_device *sg2_pcmcia_device;
92
sg2_pcmcia_init(void)93 static int __init sg2_pcmcia_init(void)
94 {
95 int ret;
96
97 if (!machine_is_stargate2())
98 return -ENODEV;
99
100 sg2_pcmcia_device = platform_device_alloc("pxa2xx-pcmcia", -1);
101 if (!sg2_pcmcia_device)
102 return -ENOMEM;
103
104 ret = gpio_request_array(sg2_pcmcia_gpios, ARRAY_SIZE(sg2_pcmcia_gpios));
105 if (ret)
106 goto error_put_platform_device;
107
108 ret = platform_device_add_data(sg2_pcmcia_device,
109 &sg2_pcmcia_ops,
110 sizeof(sg2_pcmcia_ops));
111 if (ret)
112 goto error_free_gpios;
113
114 ret = platform_device_add(sg2_pcmcia_device);
115 if (ret)
116 goto error_free_gpios;
117
118 return 0;
119 error_free_gpios:
120 gpio_free_array(sg2_pcmcia_gpios, ARRAY_SIZE(sg2_pcmcia_gpios));
121 error_put_platform_device:
122 platform_device_put(sg2_pcmcia_device);
123
124 return ret;
125 }
126
sg2_pcmcia_exit(void)127 static void __exit sg2_pcmcia_exit(void)
128 {
129 platform_device_unregister(sg2_pcmcia_device);
130 gpio_free_array(sg2_pcmcia_gpios, ARRAY_SIZE(sg2_pcmcia_gpios));
131 }
132
133 fs_initcall(sg2_pcmcia_init);
134 module_exit(sg2_pcmcia_exit);
135
136 MODULE_LICENSE("GPL");
137 MODULE_ALIAS("platform:pxa2xx-pcmcia");
138