1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * at91_cf.c -- AT91 CompactFlash controller driver
5 * Copyright (C) 2005 David Brownell
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/interrupt.h>
14 #include <linux/slab.h>
15 #include <linux/gpio.h>
17 #include <linux/sizes.h>
18 #include <linux/mfd/syscon.h>
19 #include <linux/mfd/syscon/atmel-mc.h>
21 #include <linux/of_device.h>
22 #include <linux/of_gpio.h>
23 #include <linux/pci.h>
24 #include <linux/regmap.h>
26 #include <pcmcia/ss.h>
29 * A0..A10 work in each range; A23 indicates I/O space; A25 is CFRNW;
30 * some other bit in {A24,A22..A11} is nREG to flag memory access
31 * (vs attributes). So more than 2KB/region would just be waste.
32 * Note: These are offsets from the physical base address.
34 #define CF_ATTR_PHYS (0)
35 #define CF_IO_PHYS (1 << 23)
36 #define CF_MEM_PHYS (0x017ff800)
39 int irq_pin; /* I/O IRQ */
40 int det_pin; /* Card detect */
41 int vcc_pin; /* power switching */
42 int rst_pin; /* card reset */
43 u8 chipselect; /* EBI Chip Select number */
45 #define AT91_CF_TRUE_IDE 0x01
46 #define AT91_IDE_SWAP_A0_A2 0x02
51 /*--------------------------------------------------------------------------*/
53 struct at91_cf_socket {
54 struct pcmcia_socket socket;
58 struct platform_device *pdev;
59 struct at91_cf_data *board;
61 unsigned long phys_baseaddr;
64 static inline int at91_cf_present(struct at91_cf_socket *cf)
66 return !gpio_get_value(cf->board->det_pin);
69 /*--------------------------------------------------------------------------*/
71 static int at91_cf_ss_init(struct pcmcia_socket *s)
76 static irqreturn_t at91_cf_irq(int irq, void *_cf)
78 struct at91_cf_socket *cf = _cf;
80 if (irq == gpio_to_irq(cf->board->det_pin)) {
81 unsigned present = at91_cf_present(cf);
83 /* kick pccard as needed */
84 if (present != cf->present) {
85 cf->present = present;
86 dev_dbg(&cf->pdev->dev, "card %s\n",
87 present ? "present" : "gone");
88 pcmcia_parse_events(&cf->socket, SS_DETECT);
95 static int at91_cf_get_status(struct pcmcia_socket *s, u_int *sp)
97 struct at91_cf_socket *cf;
102 cf = container_of(s, struct at91_cf_socket, socket);
104 /* NOTE: CF is always 3VCARD */
105 if (at91_cf_present(cf)) {
106 int rdy = gpio_is_valid(cf->board->irq_pin); /* RDY/nIRQ */
107 int vcc = gpio_is_valid(cf->board->vcc_pin);
109 *sp = SS_DETECT | SS_3VCARD;
110 if (!rdy || gpio_get_value(cf->board->irq_pin))
112 if (!vcc || gpio_get_value(cf->board->vcc_pin))
121 at91_cf_set_socket(struct pcmcia_socket *sock, struct socket_state_t *s)
123 struct at91_cf_socket *cf;
125 cf = container_of(sock, struct at91_cf_socket, socket);
127 /* switch Vcc if needed and possible */
128 if (gpio_is_valid(cf->board->vcc_pin)) {
131 gpio_set_value(cf->board->vcc_pin, 0);
134 gpio_set_value(cf->board->vcc_pin, 1);
141 /* toggle reset if needed */
142 gpio_set_value(cf->board->rst_pin, s->flags & SS_RESET);
144 dev_dbg(&cf->pdev->dev, "Vcc %d, io_irq %d, flags %04x csc %04x\n",
145 s->Vcc, s->io_irq, s->flags, s->csc_mask);
150 static int at91_cf_ss_suspend(struct pcmcia_socket *s)
152 return at91_cf_set_socket(s, &dead_socket);
155 /* we already mapped the I/O region */
156 static int at91_cf_set_io_map(struct pcmcia_socket *s, struct pccard_io_map *io)
158 struct at91_cf_socket *cf;
161 cf = container_of(s, struct at91_cf_socket, socket);
162 io->flags &= (MAP_ACTIVE | MAP_16BIT | MAP_AUTOSZ);
165 * Use 16 bit accesses unless/until we need 8-bit i/o space.
167 * NOTE: this CF controller ignores IOIS16, so we can't really do
168 * MAP_AUTOSZ. The 16bit mode allows single byte access on either
169 * D0-D7 (even addr) or D8-D15 (odd), so it's close enough for many
170 * purposes (and handles ide-cs).
172 * The 8bit mode is needed for odd byte access on D0-D7. It seems
173 * some cards only like that way to get at the odd byte, despite
174 * CF 3.0 spec table 35 also giving the D8-D15 option.
176 if (!(io->flags & (MAP_16BIT | MAP_AUTOSZ))) {
177 csr = AT91_MC_SMC_DBW_8;
178 dev_dbg(&cf->pdev->dev, "8bit i/o bus\n");
180 csr = AT91_MC_SMC_DBW_16;
181 dev_dbg(&cf->pdev->dev, "16bit i/o bus\n");
183 regmap_update_bits(mc, AT91_MC_SMC_CSR(cf->board->chipselect),
184 AT91_MC_SMC_DBW, csr);
186 io->start = cf->socket.io_offset;
187 io->stop = io->start + SZ_2K - 1;
192 /* pcmcia layer maps/unmaps mem regions */
194 at91_cf_set_mem_map(struct pcmcia_socket *s, struct pccard_mem_map *map)
196 struct at91_cf_socket *cf;
201 cf = container_of(s, struct at91_cf_socket, socket);
203 map->flags &= (MAP_ACTIVE | MAP_ATTRIB | MAP_16BIT);
204 if (map->flags & MAP_ATTRIB)
205 map->static_start = cf->phys_baseaddr + CF_ATTR_PHYS;
207 map->static_start = cf->phys_baseaddr + CF_MEM_PHYS;
212 static struct pccard_operations at91_cf_ops = {
213 .init = at91_cf_ss_init,
214 .suspend = at91_cf_ss_suspend,
215 .get_status = at91_cf_get_status,
216 .set_socket = at91_cf_set_socket,
217 .set_io_map = at91_cf_set_io_map,
218 .set_mem_map = at91_cf_set_mem_map,
221 /*--------------------------------------------------------------------------*/
223 static const struct of_device_id at91_cf_dt_ids[] = {
224 { .compatible = "atmel,at91rm9200-cf" },
227 MODULE_DEVICE_TABLE(of, at91_cf_dt_ids);
229 static int at91_cf_probe(struct platform_device *pdev)
231 struct at91_cf_socket *cf;
232 struct at91_cf_data *board;
234 struct resource realio;
237 board = devm_kzalloc(&pdev->dev, sizeof(*board), GFP_KERNEL);
241 board->irq_pin = of_get_gpio(pdev->dev.of_node, 0);
242 board->det_pin = of_get_gpio(pdev->dev.of_node, 1);
243 board->vcc_pin = of_get_gpio(pdev->dev.of_node, 2);
244 board->rst_pin = of_get_gpio(pdev->dev.of_node, 3);
246 mc = syscon_regmap_lookup_by_compatible("atmel,at91rm9200-sdramc");
250 if (!gpio_is_valid(board->det_pin) || !gpio_is_valid(board->rst_pin))
253 io = platform_get_resource(pdev, IORESOURCE_MEM, 0);
257 cf = devm_kzalloc(&pdev->dev, sizeof(*cf), GFP_KERNEL);
263 cf->phys_baseaddr = io->start;
264 platform_set_drvdata(pdev, cf);
266 /* must be a GPIO; ergo must trigger on both edges */
267 status = devm_gpio_request(&pdev->dev, board->det_pin, "cf_det");
271 status = devm_request_irq(&pdev->dev, gpio_to_irq(board->det_pin),
272 at91_cf_irq, 0, "at91_cf detect", cf);
276 device_init_wakeup(&pdev->dev, 1);
278 status = devm_gpio_request(&pdev->dev, board->rst_pin, "cf_rst");
282 if (gpio_is_valid(board->vcc_pin)) {
283 status = devm_gpio_request(&pdev->dev, board->vcc_pin, "cf_vcc");
289 * The card driver will request this irq later as needed.
290 * but it causes lots of "irqNN: nobody cared" messages
291 * unless we report that we handle everything (sigh).
292 * (Note: DK board doesn't wire the IRQ pin...)
294 if (gpio_is_valid(board->irq_pin)) {
295 status = devm_gpio_request(&pdev->dev, board->irq_pin, "cf_irq");
299 status = devm_request_irq(&pdev->dev, gpio_to_irq(board->irq_pin),
300 at91_cf_irq, IRQF_SHARED, "at91_cf", cf);
303 cf->socket.pci_irq = gpio_to_irq(board->irq_pin);
305 cf->socket.pci_irq = nr_irqs + 1;
308 * pcmcia layer only remaps "real" memory not iospace
309 * io_offset is set to 0x10000 to avoid the check in static_find_io().
311 cf->socket.io_offset = 0x10000;
312 realio.start = cf->socket.io_offset;
313 realio.end = realio.start + SZ_64K - 1;
314 status = pci_remap_iospace(&realio, cf->phys_baseaddr + CF_IO_PHYS);
318 /* reserve chip-select regions */
319 if (!devm_request_mem_region(&pdev->dev, io->start, resource_size(io), "at91_cf")) {
324 dev_info(&pdev->dev, "irqs det #%d, io #%d\n",
325 gpio_to_irq(board->det_pin), gpio_to_irq(board->irq_pin));
327 cf->socket.owner = THIS_MODULE;
328 cf->socket.dev.parent = &pdev->dev;
329 cf->socket.ops = &at91_cf_ops;
330 cf->socket.resource_ops = &pccard_static_ops;
331 cf->socket.features = SS_CAP_PCCARD | SS_CAP_STATIC_MAP
333 cf->socket.map_size = SZ_2K;
334 cf->socket.io[0].res = io;
336 status = pcmcia_register_socket(&cf->socket);
343 device_init_wakeup(&pdev->dev, 0);
347 static int at91_cf_remove(struct platform_device *pdev)
349 struct at91_cf_socket *cf = platform_get_drvdata(pdev);
351 pcmcia_unregister_socket(&cf->socket);
352 device_init_wakeup(&pdev->dev, 0);
359 static int at91_cf_suspend(struct platform_device *pdev, pm_message_t mesg)
361 struct at91_cf_socket *cf = platform_get_drvdata(pdev);
362 struct at91_cf_data *board = cf->board;
364 if (device_may_wakeup(&pdev->dev)) {
365 enable_irq_wake(gpio_to_irq(board->det_pin));
366 if (gpio_is_valid(board->irq_pin))
367 enable_irq_wake(gpio_to_irq(board->irq_pin));
372 static int at91_cf_resume(struct platform_device *pdev)
374 struct at91_cf_socket *cf = platform_get_drvdata(pdev);
375 struct at91_cf_data *board = cf->board;
377 if (device_may_wakeup(&pdev->dev)) {
378 disable_irq_wake(gpio_to_irq(board->det_pin));
379 if (gpio_is_valid(board->irq_pin))
380 disable_irq_wake(gpio_to_irq(board->irq_pin));
387 #define at91_cf_suspend NULL
388 #define at91_cf_resume NULL
391 static struct platform_driver at91_cf_driver = {
394 .of_match_table = at91_cf_dt_ids,
396 .probe = at91_cf_probe,
397 .remove = at91_cf_remove,
398 .suspend = at91_cf_suspend,
399 .resume = at91_cf_resume,
402 module_platform_driver(at91_cf_driver);
404 MODULE_DESCRIPTION("AT91 Compact Flash Driver");
405 MODULE_AUTHOR("David Brownell");
406 MODULE_LICENSE("GPL");
407 MODULE_ALIAS("platform:at91_cf");