xref: /openbmc/linux/drivers/pcmcia/xxs1500_ss.c (revision 58e16d792a6a8c6b750f637a4649967fcac853dc)
1  // SPDX-License-Identifier: GPL-2.0-only
2  /*
3   * PCMCIA socket code for the MyCable XXS1500 system.
4   *
5   * Copyright (c) 2009 Manuel Lauss <manuel.lauss@gmail.com>
6   *
7   */
8  
9  #include <linux/delay.h>
10  #include <linux/gpio.h>
11  #include <linux/interrupt.h>
12  #include <linux/io.h>
13  #include <linux/ioport.h>
14  #include <linux/mm.h>
15  #include <linux/module.h>
16  #include <linux/platform_device.h>
17  #include <linux/pm.h>
18  #include <linux/resource.h>
19  #include <linux/slab.h>
20  #include <linux/spinlock.h>
21  
22  #include <pcmcia/ss.h>
23  #include <pcmcia/cistpl.h>
24  
25  #include <asm/irq.h>
26  #include <asm/mach-au1x00/au1000.h>
27  
28  #define MEM_MAP_SIZE	0x400000
29  #define IO_MAP_SIZE	0x1000
30  
31  
32  /*
33   * 3.3V cards only; all interfacing is done via gpios:
34   *
35   * 0/1:  carddetect (00 = card present, xx = huh)
36   * 4:	 card irq
37   * 204:  reset (high-act)
38   * 205:  buffer enable (low-act)
39   * 208/209: card voltage key (00,01,10,11)
40   * 210:  battwarn
41   * 211:  batdead
42   * 214:  power (low-act)
43   */
44  #define GPIO_CDA	0
45  #define GPIO_CDB	1
46  #define GPIO_CARDIRQ	4
47  #define GPIO_RESET	204
48  #define GPIO_OUTEN	205
49  #define GPIO_VSL	208
50  #define GPIO_VSH	209
51  #define GPIO_BATTDEAD	210
52  #define GPIO_BATTWARN	211
53  #define GPIO_POWER	214
54  
55  struct xxs1500_pcmcia_sock {
56  	struct pcmcia_socket	socket;
57  	void		*virt_io;
58  
59  	phys_addr_t	phys_io;
60  	phys_addr_t	phys_attr;
61  	phys_addr_t	phys_mem;
62  
63  	/* previous flags for set_socket() */
64  	unsigned int old_flags;
65  };
66  
67  #define to_xxs_socket(x) container_of(x, struct xxs1500_pcmcia_sock, socket)
68  
cdirq(int irq,void * data)69  static irqreturn_t cdirq(int irq, void *data)
70  {
71  	struct xxs1500_pcmcia_sock *sock = data;
72  
73  	pcmcia_parse_events(&sock->socket, SS_DETECT);
74  
75  	return IRQ_HANDLED;
76  }
77  
xxs1500_pcmcia_configure(struct pcmcia_socket * skt,struct socket_state_t * state)78  static int xxs1500_pcmcia_configure(struct pcmcia_socket *skt,
79  				    struct socket_state_t *state)
80  {
81  	struct xxs1500_pcmcia_sock *sock = to_xxs_socket(skt);
82  	unsigned int changed;
83  
84  	/* power control */
85  	switch (state->Vcc) {
86  	case 0:
87  		gpio_set_value(GPIO_POWER, 1);	/* power off */
88  		break;
89  	case 33:
90  		gpio_set_value(GPIO_POWER, 0);	/* power on */
91  		break;
92  	case 50:
93  	default:
94  		return -EINVAL;
95  	}
96  
97  	changed = state->flags ^ sock->old_flags;
98  
99  	if (changed & SS_RESET) {
100  		if (state->flags & SS_RESET) {
101  			gpio_set_value(GPIO_RESET, 1);	/* assert reset */
102  			gpio_set_value(GPIO_OUTEN, 1);	/* buffers off */
103  		} else {
104  			gpio_set_value(GPIO_RESET, 0);	/* deassert reset */
105  			gpio_set_value(GPIO_OUTEN, 0);	/* buffers on */
106  			msleep(500);
107  		}
108  	}
109  
110  	sock->old_flags = state->flags;
111  
112  	return 0;
113  }
114  
xxs1500_pcmcia_get_status(struct pcmcia_socket * skt,unsigned int * value)115  static int xxs1500_pcmcia_get_status(struct pcmcia_socket *skt,
116  				     unsigned int *value)
117  {
118  	unsigned int status;
119  	int i;
120  
121  	status = 0;
122  
123  	/* check carddetects: GPIO[0:1] must both be low */
124  	if (!gpio_get_value(GPIO_CDA) && !gpio_get_value(GPIO_CDB))
125  		status |= SS_DETECT;
126  
127  	/* determine card voltage: GPIO[208:209] binary value */
128  	i = (!!gpio_get_value(GPIO_VSL)) | ((!!gpio_get_value(GPIO_VSH)) << 1);
129  
130  	switch (i) {
131  	case 0:
132  	case 1:
133  	case 2:
134  		status |= SS_3VCARD;	/* 3V card */
135  		break;
136  	case 3:				/* 5V card, unsupported */
137  	default:
138  		status |= SS_XVCARD;	/* treated as unsupported in core */
139  	}
140  
141  	/* GPIO214: low active power switch */
142  	status |= gpio_get_value(GPIO_POWER) ? 0 : SS_POWERON;
143  
144  	/* GPIO204: high-active reset line */
145  	status |= gpio_get_value(GPIO_RESET) ? SS_RESET : SS_READY;
146  
147  	/* other stuff */
148  	status |= gpio_get_value(GPIO_BATTDEAD) ? 0 : SS_BATDEAD;
149  	status |= gpio_get_value(GPIO_BATTWARN) ? 0 : SS_BATWARN;
150  
151  	*value = status;
152  
153  	return 0;
154  }
155  
xxs1500_pcmcia_sock_init(struct pcmcia_socket * skt)156  static int xxs1500_pcmcia_sock_init(struct pcmcia_socket *skt)
157  {
158  	gpio_direction_input(GPIO_CDA);
159  	gpio_direction_input(GPIO_CDB);
160  	gpio_direction_input(GPIO_VSL);
161  	gpio_direction_input(GPIO_VSH);
162  	gpio_direction_input(GPIO_BATTDEAD);
163  	gpio_direction_input(GPIO_BATTWARN);
164  	gpio_direction_output(GPIO_RESET, 1);	/* assert reset */
165  	gpio_direction_output(GPIO_OUTEN, 1);	/* disable buffers */
166  	gpio_direction_output(GPIO_POWER, 1);	/* power off */
167  
168  	return 0;
169  }
170  
xxs1500_pcmcia_sock_suspend(struct pcmcia_socket * skt)171  static int xxs1500_pcmcia_sock_suspend(struct pcmcia_socket *skt)
172  {
173  	return 0;
174  }
175  
au1x00_pcmcia_set_io_map(struct pcmcia_socket * skt,struct pccard_io_map * map)176  static int au1x00_pcmcia_set_io_map(struct pcmcia_socket *skt,
177  				    struct pccard_io_map *map)
178  {
179  	struct xxs1500_pcmcia_sock *sock = to_xxs_socket(skt);
180  
181  	map->start = (u32)sock->virt_io;
182  	map->stop = map->start + IO_MAP_SIZE;
183  
184  	return 0;
185  }
186  
au1x00_pcmcia_set_mem_map(struct pcmcia_socket * skt,struct pccard_mem_map * map)187  static int au1x00_pcmcia_set_mem_map(struct pcmcia_socket *skt,
188  				     struct pccard_mem_map *map)
189  {
190  	struct xxs1500_pcmcia_sock *sock = to_xxs_socket(skt);
191  
192  	if (map->flags & MAP_ATTRIB)
193  		map->static_start = sock->phys_attr + map->card_start;
194  	else
195  		map->static_start = sock->phys_mem + map->card_start;
196  
197  	return 0;
198  }
199  
200  static struct pccard_operations xxs1500_pcmcia_operations = {
201  	.init			= xxs1500_pcmcia_sock_init,
202  	.suspend		= xxs1500_pcmcia_sock_suspend,
203  	.get_status		= xxs1500_pcmcia_get_status,
204  	.set_socket		= xxs1500_pcmcia_configure,
205  	.set_io_map		= au1x00_pcmcia_set_io_map,
206  	.set_mem_map		= au1x00_pcmcia_set_mem_map,
207  };
208  
xxs1500_pcmcia_probe(struct platform_device * pdev)209  static int xxs1500_pcmcia_probe(struct platform_device *pdev)
210  {
211  	struct xxs1500_pcmcia_sock *sock;
212  	struct resource *r;
213  	int ret, irq;
214  
215  	sock = kzalloc(sizeof(struct xxs1500_pcmcia_sock), GFP_KERNEL);
216  	if (!sock)
217  		return -ENOMEM;
218  
219  	ret = -ENODEV;
220  
221  	/* 36bit PCMCIA Attribute area address */
222  	r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "pcmcia-attr");
223  	if (!r) {
224  		dev_err(&pdev->dev, "missing 'pcmcia-attr' resource!\n");
225  		goto out0;
226  	}
227  	sock->phys_attr = r->start;
228  
229  	/* 36bit PCMCIA Memory area address */
230  	r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "pcmcia-mem");
231  	if (!r) {
232  		dev_err(&pdev->dev, "missing 'pcmcia-mem' resource!\n");
233  		goto out0;
234  	}
235  	sock->phys_mem = r->start;
236  
237  	/* 36bit PCMCIA IO area address */
238  	r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "pcmcia-io");
239  	if (!r) {
240  		dev_err(&pdev->dev, "missing 'pcmcia-io' resource!\n");
241  		goto out0;
242  	}
243  	sock->phys_io = r->start;
244  
245  
246  	/*
247  	 * PCMCIA client drivers use the inb/outb macros to access
248  	 * the IO registers.  Since mips_io_port_base is added
249  	 * to the access address of the mips implementation of
250  	 * inb/outb, we need to subtract it here because we want
251  	 * to access the I/O or MEM address directly, without
252  	 * going through this "mips_io_port_base" mechanism.
253  	 */
254  	sock->virt_io = (void *)(ioremap(sock->phys_io, IO_MAP_SIZE) -
255  				 mips_io_port_base);
256  
257  	if (!sock->virt_io) {
258  		dev_err(&pdev->dev, "cannot remap IO area\n");
259  		ret = -ENOMEM;
260  		goto out0;
261  	}
262  
263  	sock->socket.ops	= &xxs1500_pcmcia_operations;
264  	sock->socket.owner	= THIS_MODULE;
265  	sock->socket.pci_irq	= gpio_to_irq(GPIO_CARDIRQ);
266  	sock->socket.features	= SS_CAP_STATIC_MAP | SS_CAP_PCCARD;
267  	sock->socket.map_size	= MEM_MAP_SIZE;
268  	sock->socket.io_offset	= (unsigned long)sock->virt_io;
269  	sock->socket.dev.parent	= &pdev->dev;
270  	sock->socket.resource_ops = &pccard_static_ops;
271  
272  	platform_set_drvdata(pdev, sock);
273  
274  	/* setup carddetect irq: use one of the 2 GPIOs as an
275  	 * edge detector.
276  	 */
277  	irq = gpio_to_irq(GPIO_CDA);
278  	irq_set_irq_type(irq, IRQ_TYPE_EDGE_BOTH);
279  	ret = request_irq(irq, cdirq, 0, "pcmcia_carddetect", sock);
280  	if (ret) {
281  		dev_err(&pdev->dev, "cannot setup cd irq\n");
282  		goto out1;
283  	}
284  
285  	ret = pcmcia_register_socket(&sock->socket);
286  	if (ret) {
287  		dev_err(&pdev->dev, "failed to register\n");
288  		goto out2;
289  	}
290  
291  	printk(KERN_INFO "MyCable XXS1500 PCMCIA socket services\n");
292  
293  	return 0;
294  
295  out2:
296  	free_irq(gpio_to_irq(GPIO_CDA), sock);
297  out1:
298  	iounmap((void *)(sock->virt_io + (u32)mips_io_port_base));
299  out0:
300  	kfree(sock);
301  	return ret;
302  }
303  
xxs1500_pcmcia_remove(struct platform_device * pdev)304  static int xxs1500_pcmcia_remove(struct platform_device *pdev)
305  {
306  	struct xxs1500_pcmcia_sock *sock = platform_get_drvdata(pdev);
307  
308  	pcmcia_unregister_socket(&sock->socket);
309  	free_irq(gpio_to_irq(GPIO_CDA), sock);
310  	iounmap((void *)(sock->virt_io + (u32)mips_io_port_base));
311  	kfree(sock);
312  
313  	return 0;
314  }
315  
316  static struct platform_driver xxs1500_pcmcia_socket_driver = {
317  	.driver	= {
318  		.name	= "xxs1500_pcmcia",
319  	},
320  	.probe		= xxs1500_pcmcia_probe,
321  	.remove		= xxs1500_pcmcia_remove,
322  };
323  
324  module_platform_driver(xxs1500_pcmcia_socket_driver);
325  
326  MODULE_LICENSE("GPL");
327  MODULE_DESCRIPTION("PCMCIA Socket Services for MyCable XXS1500 systems");
328  MODULE_AUTHOR("Manuel Lauss");
329