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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
53static const char driver_name[] = "omap_cf";
54
55struct 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
72static 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 */
78static 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 */
98static 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
106static 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
124static int
125omap_cf_set_socket(struct pcmcia_socket *sock, struct socket_state_t *s)
126{
127 /* REVISIT some non-OSK boards may support power switching */
128 switch (s->Vcc) {
129 case 0:
130 case 33:
131 break;
132 default:
133 return -EINVAL;
134 }
135
136 omap_readw(CF_CONTROL);
137 if (s->flags & SS_RESET)
138 omap_writew(CF_CONTROL_RESET, CF_CONTROL);
139 else
140 omap_writew(0, CF_CONTROL);
141
142 pr_debug("%s: Vcc %d, io_irq %d, flags %04x csc %04x\n",
143 driver_name, s->Vcc, s->io_irq, s->flags, s->csc_mask);
144
145 return 0;
146}
147
148static int omap_cf_ss_suspend(struct pcmcia_socket *s)
149{
150 pr_debug("%s: %s\n", driver_name, __func__);
151 return omap_cf_set_socket(s, &dead_socket);
152}
153
154/* regions are 2K each: mem, attrib, io (and reserved-for-ide) */
155
156static int
157omap_cf_set_io_map(struct pcmcia_socket *s, struct pccard_io_map *io)
158{
159 struct omap_cf_socket *cf;
160
161 cf = container_of(s, struct omap_cf_socket, socket);
162 io->flags &= MAP_ACTIVE|MAP_ATTRIB|MAP_16BIT;
163 io->start = cf->phys_cf + SZ_4K;
164 io->stop = io->start + SZ_2K - 1;
165 return 0;
166}
167
168static int
169omap_cf_set_mem_map(struct pcmcia_socket *s, struct pccard_mem_map *map)
170{
171 struct omap_cf_socket *cf;
172
173 if (map->card_start)
174 return -EINVAL;
175 cf = container_of(s, struct omap_cf_socket, socket);
176 map->static_start = cf->phys_cf;
177 map->flags &= MAP_ACTIVE|MAP_ATTRIB|MAP_16BIT;
178 if (map->flags & MAP_ATTRIB)
179 map->static_start += SZ_2K;
180 return 0;
181}
182
183static struct pccard_operations omap_cf_ops = {
184 .init = omap_cf_ss_init,
185 .suspend = omap_cf_ss_suspend,
186 .get_status = omap_cf_get_status,
187 .set_socket = omap_cf_set_socket,
188 .set_io_map = omap_cf_set_io_map,
189 .set_mem_map = omap_cf_set_mem_map,
190};
191
192/*--------------------------------------------------------------------------*/
193
194/*
195 * NOTE: right now the only board-specific platform_data is
196 * "what chipselect is used". Boards could want more.
197 */
198
199static int __init omap_cf_probe(struct platform_device *pdev)
200{
201 unsigned seg;
202 struct omap_cf_socket *cf;
203 int irq;
204 int status;
205 struct resource *res;
206 struct resource iospace = DEFINE_RES_IO(SZ_64, SZ_4K);
207
208 seg = (int) pdev->dev.platform_data;
209 if (seg == 0 || seg > 3)
210 return -ENODEV;
211
212 /* either CFLASH.IREQ (INT_1610_CF) or some GPIO */
213 irq = platform_get_irq(pdev, 0);
214 if (irq < 0)
215 return -EINVAL;
216
217 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
218
219 cf = kzalloc(sizeof *cf, GFP_KERNEL);
220 if (!cf)
221 return -ENOMEM;
222 timer_setup(&cf->timer, omap_cf_timer, 0);
223
224 cf->pdev = pdev;
225 platform_set_drvdata(pdev, cf);
226
227 /* this primarily just shuts up irq handling noise */
228 status = request_irq(irq, omap_cf_irq, IRQF_SHARED,
229 driver_name, cf);
230 if (status < 0)
231 goto fail0;
232 cf->irq = irq;
233 cf->socket.pci_irq = irq;
234 cf->phys_cf = res->start;
235
236 /* pcmcia layer only remaps "real" memory */
237 cf->socket.io_offset = iospace.start;
238 status = pci_remap_iospace(&iospace, cf->phys_cf + SZ_4K);
239 if (status) {
240 status = -ENOMEM;
241 goto fail1;
242 }
243
244 if (!request_mem_region(cf->phys_cf, SZ_8K, driver_name)) {
245 status = -ENXIO;
246 goto fail1;
247 }
248
249 /* NOTE: CF conflicts with MMC1 */
250 omap_cfg_reg(W11_1610_CF_CD1);
251 omap_cfg_reg(P11_1610_CF_CD2);
252 omap_cfg_reg(R11_1610_CF_IOIS16);
253 omap_cfg_reg(V10_1610_CF_IREQ);
254 omap_cfg_reg(W10_1610_CF_RESET);
255
256 omap_writew(~(1 << seg), CF_CFG);
257
258 pr_info("%s: cs%d on irq %d\n", driver_name, seg, irq);
259
260 /* CF uses armxor_ck, which is "always" available */
261
262 pr_debug("%s: sts %04x cfg %04x control %04x %s\n", driver_name,
263 omap_readw(CF_STATUS), omap_readw(CF_CFG),
264 omap_readw(CF_CONTROL),
265 omap_cf_present() ? "present" : "(not present)");
266
267 cf->socket.owner = THIS_MODULE;
268 cf->socket.dev.parent = &pdev->dev;
269 cf->socket.ops = &omap_cf_ops;
270 cf->socket.resource_ops = &pccard_static_ops;
271 cf->socket.features = SS_CAP_PCCARD | SS_CAP_STATIC_MAP
272 | SS_CAP_MEM_ALIGN;
273 cf->socket.map_size = SZ_2K;
274 cf->socket.io[0].res = &cf->iomem;
275
276 status = pcmcia_register_socket(&cf->socket);
277 if (status < 0)
278 goto fail2;
279
280 cf->active = 1;
281 mod_timer(&cf->timer, jiffies + POLL_INTERVAL);
282 return 0;
283
284fail2:
285 release_mem_region(cf->phys_cf, SZ_8K);
286fail1:
287 free_irq(irq, cf);
288fail0:
289 kfree(cf);
290 return status;
291}
292
293static void __exit omap_cf_remove(struct platform_device *pdev)
294{
295 struct omap_cf_socket *cf = platform_get_drvdata(pdev);
296
297 cf->active = 0;
298 pcmcia_unregister_socket(&cf->socket);
299 timer_shutdown_sync(&cf->timer);
300 release_mem_region(cf->phys_cf, SZ_8K);
301 free_irq(cf->irq, cf);
302 kfree(cf);
303}
304
305static struct platform_driver omap_cf_driver = {
306 .driver = {
307 .name = driver_name,
308 },
309 .remove_new = __exit_p(omap_cf_remove),
310};
311
312static int __init omap_cf_init(void)
313{
314 if (cpu_is_omap16xx())
315 return platform_driver_probe(&omap_cf_driver, omap_cf_probe);
316 return -ENODEV;
317}
318
319static void __exit omap_cf_exit(void)
320{
321 if (cpu_is_omap16xx())
322 platform_driver_unregister(&omap_cf_driver);
323}
324
325module_init(omap_cf_init);
326module_exit(omap_cf_exit);
327
328MODULE_DESCRIPTION("OMAP CF Driver");
329MODULE_LICENSE("GPL");
330MODULE_ALIAS("platform:omap_cf");
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 <mach/hardware.h>
20#include <asm/io.h>
21#include <linux/sizes.h>
22
23#include <mach/mux.h>
24#include <mach/tc.h>
25
26
27/* NOTE: don't expect this to support many I/O cards. The 16xx chips have
28 * hard-wired timings to support Compact Flash memory cards; they won't work
29 * with various other devices (like WLAN adapters) without some external
30 * logic to help out.
31 *
32 * NOTE: CF controller docs disagree with address space docs as to where
33 * CF_BASE really lives; this is a doc erratum.
34 */
35#define CF_BASE 0xfffe2800
36
37/* status; read after IRQ */
38#define CF_STATUS (CF_BASE + 0x00)
39# define CF_STATUS_BAD_READ (1 << 2)
40# define CF_STATUS_BAD_WRITE (1 << 1)
41# define CF_STATUS_CARD_DETECT (1 << 0)
42
43/* which chipselect (CS0..CS3) is used for CF (active low) */
44#define CF_CFG (CF_BASE + 0x02)
45
46/* card reset */
47#define CF_CONTROL (CF_BASE + 0x04)
48# define CF_CONTROL_RESET (1 << 0)
49
50#define omap_cf_present() (!(omap_readw(CF_STATUS) & CF_STATUS_CARD_DETECT))
51
52/*--------------------------------------------------------------------------*/
53
54static const char driver_name[] = "omap_cf";
55
56struct omap_cf_socket {
57 struct pcmcia_socket socket;
58
59 struct timer_list timer;
60 unsigned present:1;
61 unsigned active:1;
62
63 struct platform_device *pdev;
64 unsigned long phys_cf;
65 u_int irq;
66 struct resource iomem;
67};
68
69#define POLL_INTERVAL (2 * HZ)
70
71/*--------------------------------------------------------------------------*/
72
73static int omap_cf_ss_init(struct pcmcia_socket *s)
74{
75 return 0;
76}
77
78/* the timer is primarily to kick this socket's pccardd */
79static void omap_cf_timer(struct timer_list *t)
80{
81 struct omap_cf_socket *cf = from_timer(cf, t, timer);
82 unsigned present = omap_cf_present();
83
84 if (present != cf->present) {
85 cf->present = present;
86 pr_debug("%s: card %s\n", driver_name,
87 present ? "present" : "gone");
88 pcmcia_parse_events(&cf->socket, SS_DETECT);
89 }
90
91 if (cf->active)
92 mod_timer(&cf->timer, jiffies + POLL_INTERVAL);
93}
94
95/* This irq handler prevents "irqNNN: nobody cared" messages as drivers
96 * claim the card's IRQ. It may also detect some card insertions, but
97 * not removals; it can't always eliminate timer irqs.
98 */
99static irqreturn_t omap_cf_irq(int irq, void *_cf)
100{
101 struct omap_cf_socket *cf = (struct omap_cf_socket *)_cf;
102
103 omap_cf_timer(&cf->timer);
104 return IRQ_HANDLED;
105}
106
107static int omap_cf_get_status(struct pcmcia_socket *s, u_int *sp)
108{
109 if (!sp)
110 return -EINVAL;
111
112 /* NOTE CF is always 3VCARD */
113 if (omap_cf_present()) {
114 struct omap_cf_socket *cf;
115
116 *sp = SS_READY | SS_DETECT | SS_POWERON | SS_3VCARD;
117 cf = container_of(s, struct omap_cf_socket, socket);
118 s->pcmcia_irq = 0;
119 s->pci_irq = cf->irq;
120 } else
121 *sp = 0;
122 return 0;
123}
124
125static int
126omap_cf_set_socket(struct pcmcia_socket *sock, struct socket_state_t *s)
127{
128 u16 control;
129
130 /* REVISIT some non-OSK boards may support power switching */
131 switch (s->Vcc) {
132 case 0:
133 case 33:
134 break;
135 default:
136 return -EINVAL;
137 }
138
139 control = omap_readw(CF_CONTROL);
140 if (s->flags & SS_RESET)
141 omap_writew(CF_CONTROL_RESET, CF_CONTROL);
142 else
143 omap_writew(0, CF_CONTROL);
144
145 pr_debug("%s: Vcc %d, io_irq %d, flags %04x csc %04x\n",
146 driver_name, s->Vcc, s->io_irq, s->flags, s->csc_mask);
147
148 return 0;
149}
150
151static int omap_cf_ss_suspend(struct pcmcia_socket *s)
152{
153 pr_debug("%s: %s\n", driver_name, __func__);
154 return omap_cf_set_socket(s, &dead_socket);
155}
156
157/* regions are 2K each: mem, attrib, io (and reserved-for-ide) */
158
159static int
160omap_cf_set_io_map(struct pcmcia_socket *s, struct pccard_io_map *io)
161{
162 struct omap_cf_socket *cf;
163
164 cf = container_of(s, struct omap_cf_socket, socket);
165 io->flags &= MAP_ACTIVE|MAP_ATTRIB|MAP_16BIT;
166 io->start = cf->phys_cf + SZ_4K;
167 io->stop = io->start + SZ_2K - 1;
168 return 0;
169}
170
171static int
172omap_cf_set_mem_map(struct pcmcia_socket *s, struct pccard_mem_map *map)
173{
174 struct omap_cf_socket *cf;
175
176 if (map->card_start)
177 return -EINVAL;
178 cf = container_of(s, struct omap_cf_socket, socket);
179 map->static_start = cf->phys_cf;
180 map->flags &= MAP_ACTIVE|MAP_ATTRIB|MAP_16BIT;
181 if (map->flags & MAP_ATTRIB)
182 map->static_start += SZ_2K;
183 return 0;
184}
185
186static struct pccard_operations omap_cf_ops = {
187 .init = omap_cf_ss_init,
188 .suspend = omap_cf_ss_suspend,
189 .get_status = omap_cf_get_status,
190 .set_socket = omap_cf_set_socket,
191 .set_io_map = omap_cf_set_io_map,
192 .set_mem_map = omap_cf_set_mem_map,
193};
194
195/*--------------------------------------------------------------------------*/
196
197/*
198 * NOTE: right now the only board-specific platform_data is
199 * "what chipselect is used". Boards could want more.
200 */
201
202static int __init omap_cf_probe(struct platform_device *pdev)
203{
204 unsigned seg;
205 struct omap_cf_socket *cf;
206 int irq;
207 int status;
208
209 seg = (int) pdev->dev.platform_data;
210 if (seg == 0 || seg > 3)
211 return -ENODEV;
212
213 /* either CFLASH.IREQ (INT_1610_CF) or some GPIO */
214 irq = platform_get_irq(pdev, 0);
215 if (irq < 0)
216 return -EINVAL;
217
218 cf = kzalloc(sizeof *cf, GFP_KERNEL);
219 if (!cf)
220 return -ENOMEM;
221 timer_setup(&cf->timer, omap_cf_timer, 0);
222
223 cf->pdev = pdev;
224 platform_set_drvdata(pdev, cf);
225
226 /* this primarily just shuts up irq handling noise */
227 status = request_irq(irq, omap_cf_irq, IRQF_SHARED,
228 driver_name, cf);
229 if (status < 0)
230 goto fail0;
231 cf->irq = irq;
232 cf->socket.pci_irq = irq;
233
234 switch (seg) {
235 /* NOTE: CS0 could be configured too ... */
236 case 1:
237 cf->phys_cf = OMAP_CS1_PHYS;
238 break;
239 case 2:
240 cf->phys_cf = OMAP_CS2_PHYS;
241 break;
242 case 3:
243 cf->phys_cf = omap_cs3_phys();
244 break;
245 default:
246 goto fail1;
247 }
248 cf->iomem.start = cf->phys_cf;
249 cf->iomem.end = cf->iomem.end + SZ_8K - 1;
250 cf->iomem.flags = IORESOURCE_MEM;
251
252 /* pcmcia layer only remaps "real" memory */
253 cf->socket.io_offset = (unsigned long)
254 ioremap(cf->phys_cf + SZ_4K, SZ_2K);
255 if (!cf->socket.io_offset)
256 goto fail1;
257
258 if (!request_mem_region(cf->phys_cf, SZ_8K, driver_name))
259 goto fail1;
260
261 /* NOTE: CF conflicts with MMC1 */
262 omap_cfg_reg(W11_1610_CF_CD1);
263 omap_cfg_reg(P11_1610_CF_CD2);
264 omap_cfg_reg(R11_1610_CF_IOIS16);
265 omap_cfg_reg(V10_1610_CF_IREQ);
266 omap_cfg_reg(W10_1610_CF_RESET);
267
268 omap_writew(~(1 << seg), CF_CFG);
269
270 pr_info("%s: cs%d on irq %d\n", driver_name, seg, irq);
271
272 /* NOTE: better EMIFS setup might support more cards; but the
273 * TRM only shows how to affect regular flash signals, not their
274 * CF/PCMCIA variants...
275 */
276 pr_debug("%s: cs%d, previous ccs %08x acs %08x\n", driver_name,
277 seg, omap_readl(EMIFS_CCS(seg)), omap_readl(EMIFS_ACS(seg)));
278 omap_writel(0x0004a1b3, EMIFS_CCS(seg)); /* synch mode 4 etc */
279 omap_writel(0x00000000, EMIFS_ACS(seg)); /* OE hold/setup */
280
281 /* CF uses armxor_ck, which is "always" available */
282
283 pr_debug("%s: sts %04x cfg %04x control %04x %s\n", driver_name,
284 omap_readw(CF_STATUS), omap_readw(CF_CFG),
285 omap_readw(CF_CONTROL),
286 omap_cf_present() ? "present" : "(not present)");
287
288 cf->socket.owner = THIS_MODULE;
289 cf->socket.dev.parent = &pdev->dev;
290 cf->socket.ops = &omap_cf_ops;
291 cf->socket.resource_ops = &pccard_static_ops;
292 cf->socket.features = SS_CAP_PCCARD | SS_CAP_STATIC_MAP
293 | SS_CAP_MEM_ALIGN;
294 cf->socket.map_size = SZ_2K;
295 cf->socket.io[0].res = &cf->iomem;
296
297 status = pcmcia_register_socket(&cf->socket);
298 if (status < 0)
299 goto fail2;
300
301 cf->active = 1;
302 mod_timer(&cf->timer, jiffies + POLL_INTERVAL);
303 return 0;
304
305fail2:
306 release_mem_region(cf->phys_cf, SZ_8K);
307fail1:
308 if (cf->socket.io_offset)
309 iounmap((void __iomem *) cf->socket.io_offset);
310 free_irq(irq, cf);
311fail0:
312 kfree(cf);
313 return status;
314}
315
316static int __exit omap_cf_remove(struct platform_device *pdev)
317{
318 struct omap_cf_socket *cf = platform_get_drvdata(pdev);
319
320 cf->active = 0;
321 pcmcia_unregister_socket(&cf->socket);
322 del_timer_sync(&cf->timer);
323 iounmap((void __iomem *) cf->socket.io_offset);
324 release_mem_region(cf->phys_cf, SZ_8K);
325 free_irq(cf->irq, cf);
326 kfree(cf);
327 return 0;
328}
329
330static struct platform_driver omap_cf_driver = {
331 .driver = {
332 .name = driver_name,
333 },
334 .remove = __exit_p(omap_cf_remove),
335};
336
337static int __init omap_cf_init(void)
338{
339 if (cpu_is_omap16xx())
340 return platform_driver_probe(&omap_cf_driver, omap_cf_probe);
341 return -ENODEV;
342}
343
344static void __exit omap_cf_exit(void)
345{
346 if (cpu_is_omap16xx())
347 platform_driver_unregister(&omap_cf_driver);
348}
349
350module_init(omap_cf_init);
351module_exit(omap_cf_exit);
352
353MODULE_DESCRIPTION("OMAP CF Driver");
354MODULE_LICENSE("GPL");
355MODULE_ALIAS("platform:omap_cf");