xref: /openbmc/linux/drivers/pcmcia/omap_cf.c (revision 9b656879)
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * omap_cf.c -- OMAP 16xx CompactFlash controller driver
4  *
5  * Copyright (c) 2005 David Brownell
6  */
7 
8 #include <linux/module.h>
9 #include <linux/kernel.h>
10 #include <linux/platform_device.h>
11 #include <linux/errno.h>
12 #include <linux/init.h>
13 #include <linux/delay.h>
14 #include <linux/interrupt.h>
15 #include <linux/slab.h>
16 
17 #include <pcmcia/ss.h>
18 
19 #include <asm/io.h>
20 #include <linux/sizes.h>
21 
22 #include <linux/soc/ti/omap1-io.h>
23 #include <linux/soc/ti/omap1-soc.h>
24 #include <linux/soc/ti/omap1-mux.h>
25 
26 /* NOTE:  don't expect this to support many I/O cards.  The 16xx chips have
27  * hard-wired timings to support Compact Flash memory cards; they won't work
28  * with various other devices (like WLAN adapters) without some external
29  * logic to help out.
30  *
31  * NOTE:  CF controller docs disagree with address space docs as to where
32  * CF_BASE really lives; this is a doc erratum.
33  */
34 #define	CF_BASE	0xfffe2800
35 
36 /* status; read after IRQ */
37 #define CF_STATUS			(CF_BASE + 0x00)
38 #	define	CF_STATUS_BAD_READ	(1 << 2)
39 #	define	CF_STATUS_BAD_WRITE	(1 << 1)
40 #	define	CF_STATUS_CARD_DETECT	(1 << 0)
41 
42 /* which chipselect (CS0..CS3) is used for CF (active low) */
43 #define CF_CFG				(CF_BASE + 0x02)
44 
45 /* card reset */
46 #define CF_CONTROL			(CF_BASE + 0x04)
47 #	define	CF_CONTROL_RESET	(1 << 0)
48 
49 #define omap_cf_present() (!(omap_readw(CF_STATUS) & CF_STATUS_CARD_DETECT))
50 
51 /*--------------------------------------------------------------------------*/
52 
53 static const char driver_name[] = "omap_cf";
54 
55 struct omap_cf_socket {
56 	struct pcmcia_socket	socket;
57 
58 	struct timer_list	timer;
59 	unsigned		present:1;
60 	unsigned		active:1;
61 
62 	struct platform_device	*pdev;
63 	unsigned long		phys_cf;
64 	u_int			irq;
65 	struct resource		iomem;
66 };
67 
68 #define	POLL_INTERVAL		(2 * HZ)
69 
70 /*--------------------------------------------------------------------------*/
71 
72 static int omap_cf_ss_init(struct pcmcia_socket *s)
73 {
74 	return 0;
75 }
76 
77 /* the timer is primarily to kick this socket's pccardd */
78 static void omap_cf_timer(struct timer_list *t)
79 {
80 	struct omap_cf_socket	*cf = from_timer(cf, t, timer);
81 	unsigned		present = omap_cf_present();
82 
83 	if (present != cf->present) {
84 		cf->present = present;
85 		pr_debug("%s: card %s\n", driver_name,
86 			present ? "present" : "gone");
87 		pcmcia_parse_events(&cf->socket, SS_DETECT);
88 	}
89 
90 	if (cf->active)
91 		mod_timer(&cf->timer, jiffies + POLL_INTERVAL);
92 }
93 
94 /* This irq handler prevents "irqNNN: nobody cared" messages as drivers
95  * claim the card's IRQ.  It may also detect some card insertions, but
96  * not removals; it can't always eliminate timer irqs.
97  */
98 static irqreturn_t omap_cf_irq(int irq, void *_cf)
99 {
100 	struct omap_cf_socket *cf = (struct omap_cf_socket *)_cf;
101 
102 	omap_cf_timer(&cf->timer);
103 	return IRQ_HANDLED;
104 }
105 
106 static int omap_cf_get_status(struct pcmcia_socket *s, u_int *sp)
107 {
108 	if (!sp)
109 		return -EINVAL;
110 
111 	/* NOTE CF is always 3VCARD */
112 	if (omap_cf_present()) {
113 		struct omap_cf_socket	*cf;
114 
115 		*sp = SS_READY | SS_DETECT | SS_POWERON | SS_3VCARD;
116 		cf = container_of(s, struct omap_cf_socket, socket);
117 		s->pcmcia_irq = 0;
118 		s->pci_irq = cf->irq;
119 	} else
120 		*sp = 0;
121 	return 0;
122 }
123 
124 static int
125 omap_cf_set_socket(struct pcmcia_socket *sock, struct socket_state_t *s)
126 {
127 	u16		control;
128 
129 	/* REVISIT some non-OSK boards may support power switching */
130 	switch (s->Vcc) {
131 	case 0:
132 	case 33:
133 		break;
134 	default:
135 		return -EINVAL;
136 	}
137 
138 	control = omap_readw(CF_CONTROL);
139 	if (s->flags & SS_RESET)
140 		omap_writew(CF_CONTROL_RESET, CF_CONTROL);
141 	else
142 		omap_writew(0, CF_CONTROL);
143 
144 	pr_debug("%s: Vcc %d, io_irq %d, flags %04x csc %04x\n",
145 		driver_name, s->Vcc, s->io_irq, s->flags, s->csc_mask);
146 
147 	return 0;
148 }
149 
150 static int omap_cf_ss_suspend(struct pcmcia_socket *s)
151 {
152 	pr_debug("%s: %s\n", driver_name, __func__);
153 	return omap_cf_set_socket(s, &dead_socket);
154 }
155 
156 /* regions are 2K each:  mem, attrib, io (and reserved-for-ide) */
157 
158 static int
159 omap_cf_set_io_map(struct pcmcia_socket *s, struct pccard_io_map *io)
160 {
161 	struct omap_cf_socket	*cf;
162 
163 	cf = container_of(s, struct omap_cf_socket, socket);
164 	io->flags &= MAP_ACTIVE|MAP_ATTRIB|MAP_16BIT;
165 	io->start = cf->phys_cf + SZ_4K;
166 	io->stop = io->start + SZ_2K - 1;
167 	return 0;
168 }
169 
170 static int
171 omap_cf_set_mem_map(struct pcmcia_socket *s, struct pccard_mem_map *map)
172 {
173 	struct omap_cf_socket	*cf;
174 
175 	if (map->card_start)
176 		return -EINVAL;
177 	cf = container_of(s, struct omap_cf_socket, socket);
178 	map->static_start = cf->phys_cf;
179 	map->flags &= MAP_ACTIVE|MAP_ATTRIB|MAP_16BIT;
180 	if (map->flags & MAP_ATTRIB)
181 		map->static_start += SZ_2K;
182 	return 0;
183 }
184 
185 static struct pccard_operations omap_cf_ops = {
186 	.init			= omap_cf_ss_init,
187 	.suspend		= omap_cf_ss_suspend,
188 	.get_status		= omap_cf_get_status,
189 	.set_socket		= omap_cf_set_socket,
190 	.set_io_map		= omap_cf_set_io_map,
191 	.set_mem_map		= omap_cf_set_mem_map,
192 };
193 
194 /*--------------------------------------------------------------------------*/
195 
196 /*
197  * NOTE:  right now the only board-specific platform_data is
198  * "what chipselect is used".  Boards could want more.
199  */
200 
201 static int __init omap_cf_probe(struct platform_device *pdev)
202 {
203 	unsigned		seg;
204 	struct omap_cf_socket	*cf;
205 	int			irq;
206 	int			status;
207 	struct resource		*res;
208 	struct resource		iospace = DEFINE_RES_IO(SZ_64, SZ_4K);
209 
210 	seg = (int) pdev->dev.platform_data;
211 	if (seg == 0 || seg > 3)
212 		return -ENODEV;
213 
214 	/* either CFLASH.IREQ (INT_1610_CF) or some GPIO */
215 	irq = platform_get_irq(pdev, 0);
216 	if (irq < 0)
217 		return -EINVAL;
218 
219 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
220 
221 	cf = kzalloc(sizeof *cf, GFP_KERNEL);
222 	if (!cf)
223 		return -ENOMEM;
224 	timer_setup(&cf->timer, omap_cf_timer, 0);
225 
226 	cf->pdev = pdev;
227 	platform_set_drvdata(pdev, cf);
228 
229 	/* this primarily just shuts up irq handling noise */
230 	status = request_irq(irq, omap_cf_irq, IRQF_SHARED,
231 			driver_name, cf);
232 	if (status < 0)
233 		goto fail0;
234 	cf->irq = irq;
235 	cf->socket.pci_irq = irq;
236 	cf->phys_cf = res->start;
237 
238 	/* pcmcia layer only remaps "real" memory */
239 	cf->socket.io_offset = iospace.start;
240 	status = pci_remap_iospace(&iospace, cf->phys_cf + SZ_4K);
241 	if (status) {
242 		status = -ENOMEM;
243 		goto fail1;
244 	}
245 
246 	if (!request_mem_region(cf->phys_cf, SZ_8K, driver_name)) {
247 		status = -ENXIO;
248 		goto fail1;
249 	}
250 
251 	/* NOTE:  CF conflicts with MMC1 */
252 	omap_cfg_reg(W11_1610_CF_CD1);
253 	omap_cfg_reg(P11_1610_CF_CD2);
254 	omap_cfg_reg(R11_1610_CF_IOIS16);
255 	omap_cfg_reg(V10_1610_CF_IREQ);
256 	omap_cfg_reg(W10_1610_CF_RESET);
257 
258 	omap_writew(~(1 << seg), CF_CFG);
259 
260 	pr_info("%s: cs%d on irq %d\n", driver_name, seg, irq);
261 
262 	/* CF uses armxor_ck, which is "always" available */
263 
264 	pr_debug("%s: sts %04x cfg %04x control %04x %s\n", driver_name,
265 		omap_readw(CF_STATUS), omap_readw(CF_CFG),
266 		omap_readw(CF_CONTROL),
267 		omap_cf_present() ? "present" : "(not present)");
268 
269 	cf->socket.owner = THIS_MODULE;
270 	cf->socket.dev.parent = &pdev->dev;
271 	cf->socket.ops = &omap_cf_ops;
272 	cf->socket.resource_ops = &pccard_static_ops;
273 	cf->socket.features = SS_CAP_PCCARD | SS_CAP_STATIC_MAP
274 				| SS_CAP_MEM_ALIGN;
275 	cf->socket.map_size = SZ_2K;
276 	cf->socket.io[0].res = &cf->iomem;
277 
278 	status = pcmcia_register_socket(&cf->socket);
279 	if (status < 0)
280 		goto fail2;
281 
282 	cf->active = 1;
283 	mod_timer(&cf->timer, jiffies + POLL_INTERVAL);
284 	return 0;
285 
286 fail2:
287 	release_mem_region(cf->phys_cf, SZ_8K);
288 fail1:
289 	free_irq(irq, cf);
290 fail0:
291 	kfree(cf);
292 	return status;
293 }
294 
295 static int __exit omap_cf_remove(struct platform_device *pdev)
296 {
297 	struct omap_cf_socket *cf = platform_get_drvdata(pdev);
298 
299 	cf->active = 0;
300 	pcmcia_unregister_socket(&cf->socket);
301 	del_timer_sync(&cf->timer);
302 	release_mem_region(cf->phys_cf, SZ_8K);
303 	free_irq(cf->irq, cf);
304 	kfree(cf);
305 	return 0;
306 }
307 
308 static struct platform_driver omap_cf_driver = {
309 	.driver = {
310 		.name	= driver_name,
311 	},
312 	.remove		= __exit_p(omap_cf_remove),
313 };
314 
315 static int __init omap_cf_init(void)
316 {
317 	if (cpu_is_omap16xx())
318 		return platform_driver_probe(&omap_cf_driver, omap_cf_probe);
319 	return -ENODEV;
320 }
321 
322 static void __exit omap_cf_exit(void)
323 {
324 	if (cpu_is_omap16xx())
325 		platform_driver_unregister(&omap_cf_driver);
326 }
327 
328 module_init(omap_cf_init);
329 module_exit(omap_cf_exit);
330 
331 MODULE_DESCRIPTION("OMAP CF Driver");
332 MODULE_LICENSE("GPL");
333 MODULE_ALIAS("platform:omap_cf");
334