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authorAlessandro Rubini <rubini@gnudd.com>2012-04-12 04:48:44 -0400
committerSamuel Ortiz <sameo@linux.intel.com>2012-05-09 09:34:28 -0400
commit35bdd29095ad614c5fb4a934bfd4f57a94dfd395 (patch)
tree26db4b35f5f05d4a160235aa02ba5cb579c5f2f9 /drivers/mfd/sta2x11-mfd.c
parentceb57d27e28a8f979cbfd6391b7da6da51484059 (diff)
mfd: Add driver for STA2X11 MFD block
This also introduces <asm/sta2x11.h> to export a function that is in the base sta2x11 support patches. The header will increase with other prototypes and constants over time. Signed-off-by: Alessandro Rubini <rubini@gnudd.com> Acked-by: Giancarlo Asnaghi <giancarlo.asnaghi@st.com> Cc: Alan Cox <alan@linux.intel.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
Diffstat (limited to 'drivers/mfd/sta2x11-mfd.c')
-rw-r--r--drivers/mfd/sta2x11-mfd.c467
1 files changed, 467 insertions, 0 deletions
diff --git a/drivers/mfd/sta2x11-mfd.c b/drivers/mfd/sta2x11-mfd.c
new file mode 100644
index 000000000000..d31fed07aefb
--- /dev/null
+++ b/drivers/mfd/sta2x11-mfd.c
@@ -0,0 +1,467 @@
1/*
2 * Copyright (c) 2009-2011 Wind River Systems, Inc.
3 * Copyright (c) 2011 ST Microelectronics (Alessandro Rubini)
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
12 * See the GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17 *
18 */
19
20#include <linux/kernel.h>
21#include <linux/module.h>
22#include <linux/spinlock.h>
23#include <linux/errno.h>
24#include <linux/device.h>
25#include <linux/slab.h>
26#include <linux/list.h>
27#include <linux/io.h>
28#include <linux/ioport.h>
29#include <linux/pci.h>
30#include <linux/debugfs.h>
31#include <linux/seq_file.h>
32#include <linux/platform_device.h>
33#include <linux/mfd/core.h>
34#include <linux/mfd/sta2x11-mfd.h>
35
36#include <asm/sta2x11.h>
37
38/* This describes STA2X11 MFD chip for us, we may have several */
39struct sta2x11_mfd {
40 struct sta2x11_instance *instance;
41 spinlock_t lock;
42 struct list_head list;
43 void __iomem *sctl_regs;
44 void __iomem *apbreg_regs;
45};
46
47static LIST_HEAD(sta2x11_mfd_list);
48
49/* Three functions to act on the list */
50static struct sta2x11_mfd *sta2x11_mfd_find(struct pci_dev *pdev)
51{
52 struct sta2x11_instance *instance;
53 struct sta2x11_mfd *mfd;
54
55 if (!pdev && !list_empty(&sta2x11_mfd_list)) {
56 pr_warning("%s: Unspecified device, "
57 "using first instance\n", __func__);
58 return list_entry(sta2x11_mfd_list.next,
59 struct sta2x11_mfd, list);
60 }
61
62 instance = sta2x11_get_instance(pdev);
63 if (!instance)
64 return NULL;
65 list_for_each_entry(mfd, &sta2x11_mfd_list, list) {
66 if (mfd->instance == instance)
67 return mfd;
68 }
69 return NULL;
70}
71
72static int __devinit sta2x11_mfd_add(struct pci_dev *pdev, gfp_t flags)
73{
74 struct sta2x11_mfd *mfd = sta2x11_mfd_find(pdev);
75 struct sta2x11_instance *instance;
76
77 if (mfd)
78 return -EBUSY;
79 instance = sta2x11_get_instance(pdev);
80 if (!instance)
81 return -EINVAL;
82 mfd = kzalloc(sizeof(*mfd), flags);
83 if (!mfd)
84 return -ENOMEM;
85 INIT_LIST_HEAD(&mfd->list);
86 spin_lock_init(&mfd->lock);
87 mfd->instance = instance;
88 list_add(&mfd->list, &sta2x11_mfd_list);
89 return 0;
90}
91
92static int __devexit mfd_remove(struct pci_dev *pdev)
93{
94 struct sta2x11_mfd *mfd = sta2x11_mfd_find(pdev);
95
96 if (!mfd)
97 return -ENODEV;
98 list_del(&mfd->list);
99 kfree(mfd);
100 return 0;
101}
102
103/* These two functions are exported and are not expected to fail */
104u32 sta2x11_sctl_mask(struct pci_dev *pdev, u32 reg, u32 mask, u32 val)
105{
106 struct sta2x11_mfd *mfd = sta2x11_mfd_find(pdev);
107 u32 r;
108 unsigned long flags;
109
110 if (!mfd) {
111 dev_warn(&pdev->dev, ": can't access sctl regs\n");
112 return 0;
113 }
114 if (!mfd->sctl_regs) {
115 dev_warn(&pdev->dev, ": system ctl not initialized\n");
116 return 0;
117 }
118 spin_lock_irqsave(&mfd->lock, flags);
119 r = readl(mfd->sctl_regs + reg);
120 r &= ~mask;
121 r |= val;
122 if (mask)
123 writel(r, mfd->sctl_regs + reg);
124 spin_unlock_irqrestore(&mfd->lock, flags);
125 return r;
126}
127EXPORT_SYMBOL(sta2x11_sctl_mask);
128
129u32 sta2x11_apbreg_mask(struct pci_dev *pdev, u32 reg, u32 mask, u32 val)
130{
131 struct sta2x11_mfd *mfd = sta2x11_mfd_find(pdev);
132 u32 r;
133 unsigned long flags;
134
135 if (!mfd) {
136 dev_warn(&pdev->dev, ": can't access apb regs\n");
137 return 0;
138 }
139 if (!mfd->apbreg_regs) {
140 dev_warn(&pdev->dev, ": apb bridge not initialized\n");
141 return 0;
142 }
143 spin_lock_irqsave(&mfd->lock, flags);
144 r = readl(mfd->apbreg_regs + reg);
145 r &= ~mask;
146 r |= val;
147 if (mask)
148 writel(r, mfd->apbreg_regs + reg);
149 spin_unlock_irqrestore(&mfd->lock, flags);
150 return r;
151}
152EXPORT_SYMBOL(sta2x11_apbreg_mask);
153
154/* Two debugfs files, for our registers (FIXME: one instance only) */
155#define REG(regname) {.name = #regname, .offset = SCTL_ ## regname}
156static struct debugfs_reg32 sta2x11_sctl_regs[] = {
157 REG(SCCTL), REG(ARMCFG), REG(SCPLLCTL), REG(SCPLLFCTRL),
158 REG(SCRESFRACT), REG(SCRESCTRL1), REG(SCRESXTRL2), REG(SCPEREN0),
159 REG(SCPEREN1), REG(SCPEREN2), REG(SCGRST), REG(SCPCIPMCR1),
160 REG(SCPCIPMCR2), REG(SCPCIPMSR1), REG(SCPCIPMSR2), REG(SCPCIPMSR3),
161 REG(SCINTREN), REG(SCRISR), REG(SCCLKSTAT0), REG(SCCLKSTAT1),
162 REG(SCCLKSTAT2), REG(SCRSTSTA),
163};
164#undef REG
165
166static struct debugfs_regset32 sctl_regset = {
167 .regs = sta2x11_sctl_regs,
168 .nregs = ARRAY_SIZE(sta2x11_sctl_regs),
169};
170
171#define REG(regname) {.name = #regname, .offset = regname}
172static struct debugfs_reg32 sta2x11_apbreg_regs[] = {
173 REG(APBREG_BSR), REG(APBREG_PAER), REG(APBREG_PWAC), REG(APBREG_PRAC),
174 REG(APBREG_PCG), REG(APBREG_PUR), REG(APBREG_EMU_PCG),
175};
176#undef REG
177
178static struct debugfs_regset32 apbreg_regset = {
179 .regs = sta2x11_apbreg_regs,
180 .nregs = ARRAY_SIZE(sta2x11_apbreg_regs),
181};
182
183static struct dentry *sta2x11_sctl_debugfs;
184static struct dentry *sta2x11_apbreg_debugfs;
185
186/* Probe for the two platform devices */
187static int sta2x11_sctl_probe(struct platform_device *dev)
188{
189 struct pci_dev **pdev;
190 struct sta2x11_mfd *mfd;
191 struct resource *res;
192
193 pdev = dev->dev.platform_data;
194 mfd = sta2x11_mfd_find(*pdev);
195 if (!mfd)
196 return -ENODEV;
197
198 res = platform_get_resource(dev, IORESOURCE_MEM, 0);
199 if (!res)
200 return -ENOMEM;
201
202 if (!request_mem_region(res->start, resource_size(res),
203 "sta2x11-sctl"))
204 return -EBUSY;
205
206 mfd->sctl_regs = ioremap(res->start, resource_size(res));
207 if (!mfd->sctl_regs) {
208 release_mem_region(res->start, resource_size(res));
209 return -ENOMEM;
210 }
211 sctl_regset.base = mfd->sctl_regs;
212 sta2x11_sctl_debugfs = debugfs_create_regset32("sta2x11-sctl",
213 S_IFREG | S_IRUGO,
214 NULL, &sctl_regset);
215 return 0;
216}
217
218static int sta2x11_apbreg_probe(struct platform_device *dev)
219{
220 struct pci_dev **pdev;
221 struct sta2x11_mfd *mfd;
222 struct resource *res;
223
224 pdev = dev->dev.platform_data;
225 dev_dbg(&dev->dev, "%s: pdata is %p\n", __func__, pdev);
226 dev_dbg(&dev->dev, "%s: *pdata is %p\n", __func__, *pdev);
227
228 mfd = sta2x11_mfd_find(*pdev);
229 if (!mfd)
230 return -ENODEV;
231
232 res = platform_get_resource(dev, IORESOURCE_MEM, 0);
233 if (!res)
234 return -ENOMEM;
235
236 if (!request_mem_region(res->start, resource_size(res),
237 "sta2x11-apbreg"))
238 return -EBUSY;
239
240 mfd->apbreg_regs = ioremap(res->start, resource_size(res));
241 if (!mfd->apbreg_regs) {
242 release_mem_region(res->start, resource_size(res));
243 return -ENOMEM;
244 }
245 dev_dbg(&dev->dev, "%s: regbase %p\n", __func__, mfd->apbreg_regs);
246
247 apbreg_regset.base = mfd->apbreg_regs;
248 sta2x11_apbreg_debugfs = debugfs_create_regset32("sta2x11-apbreg",
249 S_IFREG | S_IRUGO,
250 NULL, &apbreg_regset);
251 return 0;
252}
253
254/* The two platform drivers */
255static struct platform_driver sta2x11_sctl_platform_driver = {
256 .driver = {
257 .name = "sta2x11-sctl",
258 .owner = THIS_MODULE,
259 },
260 .probe = sta2x11_sctl_probe,
261};
262
263static int __init sta2x11_sctl_init(void)
264{
265 pr_info("%s\n", __func__);
266 return platform_driver_register(&sta2x11_sctl_platform_driver);
267}
268
269static struct platform_driver sta2x11_platform_driver = {
270 .driver = {
271 .name = "sta2x11-apbreg",
272 .owner = THIS_MODULE,
273 },
274 .probe = sta2x11_apbreg_probe,
275};
276
277static int __init sta2x11_apbreg_init(void)
278{
279 pr_info("%s\n", __func__);
280 return platform_driver_register(&sta2x11_platform_driver);
281}
282
283/*
284 * What follows is the PCI device that hosts the above two pdevs.
285 * Each logic block is 4kB and they are all consecutive: we use this info.
286 */
287
288/* Bar 0 */
289enum bar0_cells {
290 STA2X11_GPIO_0 = 0,
291 STA2X11_GPIO_1,
292 STA2X11_GPIO_2,
293 STA2X11_GPIO_3,
294 STA2X11_SCTL,
295 STA2X11_SCR,
296 STA2X11_TIME,
297};
298/* Bar 1 */
299enum bar1_cells {
300 STA2X11_APBREG = 0,
301};
302#define CELL_4K(_name, _cell) { \
303 .name = _name, \
304 .start = _cell * 4096, .end = _cell * 4096 + 4095, \
305 .flags = IORESOURCE_MEM, \
306 }
307
308static const __devinitconst struct resource gpio_resources[] = {
309 {
310 .name = "sta2x11_gpio", /* 4 consecutive cells, 1 driver */
311 .start = 0,
312 .end = (4 * 4096) - 1,
313 .flags = IORESOURCE_MEM,
314 }
315};
316static const __devinitconst struct resource sctl_resources[] = {
317 CELL_4K("sta2x11-sctl", STA2X11_SCTL),
318};
319static const __devinitconst struct resource scr_resources[] = {
320 CELL_4K("sta2x11-scr", STA2X11_SCR),
321};
322static const __devinitconst struct resource time_resources[] = {
323 CELL_4K("sta2x11-time", STA2X11_TIME),
324};
325
326static const __devinitconst struct resource apbreg_resources[] = {
327 CELL_4K("sta2x11-apbreg", STA2X11_APBREG),
328};
329
330#define DEV(_name, _r) \
331 { .name = _name, .num_resources = ARRAY_SIZE(_r), .resources = _r, }
332
333static __devinitdata struct mfd_cell sta2x11_mfd_bar0[] = {
334 DEV("sta2x11-gpio", gpio_resources), /* offset 0: we add pdata later */
335 DEV("sta2x11-sctl", sctl_resources),
336 DEV("sta2x11-scr", scr_resources),
337 DEV("sta2x11-time", time_resources),
338};
339
340static __devinitdata struct mfd_cell sta2x11_mfd_bar1[] = {
341 DEV("sta2x11-apbreg", apbreg_resources),
342};
343
344static int sta2x11_mfd_suspend(struct pci_dev *pdev, pm_message_t state)
345{
346 pci_save_state(pdev);
347 pci_disable_device(pdev);
348 pci_set_power_state(pdev, pci_choose_state(pdev, state));
349
350 return 0;
351}
352
353static int sta2x11_mfd_resume(struct pci_dev *pdev)
354{
355 int err;
356
357 pci_set_power_state(pdev, 0);
358 err = pci_enable_device(pdev);
359 if (err)
360 return err;
361 pci_restore_state(pdev);
362
363 return 0;
364}
365
366static int __devinit sta2x11_mfd_probe(struct pci_dev *pdev,
367 const struct pci_device_id *pci_id)
368{
369 int err, i;
370 struct sta2x11_gpio_pdata *gpio_data;
371
372 dev_info(&pdev->dev, "%s\n", __func__);
373
374 err = pci_enable_device(pdev);
375 if (err) {
376 dev_err(&pdev->dev, "Can't enable device.\n");
377 return err;
378 }
379
380 err = pci_enable_msi(pdev);
381 if (err)
382 dev_info(&pdev->dev, "Enable msi failed\n");
383
384 /* Read gpio config data as pci device's platform data */
385 gpio_data = dev_get_platdata(&pdev->dev);
386 if (!gpio_data)
387 dev_warn(&pdev->dev, "no gpio configuration\n");
388
389 dev_dbg(&pdev->dev, "%s, gpio_data = %p (%p)\n", __func__,
390 gpio_data, &gpio_data);
391 dev_dbg(&pdev->dev, "%s, pdev = %p (%p)\n", __func__,
392 pdev, &pdev);
393
394 /* platform data is the pci device for all of them */
395 for (i = 0; i < ARRAY_SIZE(sta2x11_mfd_bar0); i++) {
396 sta2x11_mfd_bar0[i].pdata_size = sizeof(pdev);
397 sta2x11_mfd_bar0[i].platform_data = &pdev;
398 }
399 sta2x11_mfd_bar1[0].pdata_size = sizeof(pdev);
400 sta2x11_mfd_bar1[0].platform_data = &pdev;
401
402 /* Record this pdev before mfd_add_devices: their probe looks for it */
403 sta2x11_mfd_add(pdev, GFP_ATOMIC);
404
405
406 err = mfd_add_devices(&pdev->dev, -1,
407 sta2x11_mfd_bar0,
408 ARRAY_SIZE(sta2x11_mfd_bar0),
409 &pdev->resource[0],
410 0);
411 if (err) {
412 dev_err(&pdev->dev, "mfd_add_devices[0] failed: %d\n", err);
413 goto err_disable;
414 }
415
416 err = mfd_add_devices(&pdev->dev, -1,
417 sta2x11_mfd_bar1,
418 ARRAY_SIZE(sta2x11_mfd_bar1),
419 &pdev->resource[1],
420 0);
421 if (err) {
422 dev_err(&pdev->dev, "mfd_add_devices[1] failed: %d\n", err);
423 goto err_disable;
424 }
425
426 return 0;
427
428err_disable:
429 mfd_remove_devices(&pdev->dev);
430 pci_disable_device(pdev);
431 pci_disable_msi(pdev);
432 return err;
433}
434
435static DEFINE_PCI_DEVICE_TABLE(sta2x11_mfd_tbl) = {
436 {PCI_DEVICE(PCI_VENDOR_ID_STMICRO, PCI_DEVICE_ID_STMICRO_GPIO)},
437 {0,},
438};
439
440static struct pci_driver sta2x11_mfd_driver = {
441 .name = "sta2x11-mfd",
442 .id_table = sta2x11_mfd_tbl,
443 .probe = sta2x11_mfd_probe,
444 .suspend = sta2x11_mfd_suspend,
445 .resume = sta2x11_mfd_resume,
446};
447
448static int __init sta2x11_mfd_init(void)
449{
450 pr_info("%s\n", __func__);
451 return pci_register_driver(&sta2x11_mfd_driver);
452}
453
454/*
455 * All of this must be ready before "normal" devices like MMCI appear.
456 * But MFD (the pci device) can't be too early. The following choice
457 * prepares platform drivers very early and probe the PCI device later,
458 * but before other PCI devices.
459 */
460subsys_initcall(sta2x11_apbreg_init);
461subsys_initcall(sta2x11_sctl_init);
462rootfs_initcall(sta2x11_mfd_init);
463
464MODULE_LICENSE("GPL v2");
465MODULE_AUTHOR("Wind River");
466MODULE_DESCRIPTION("STA2x11 mfd for GPIO, SCTL and APBREG");
467MODULE_DEVICE_TABLE(pci, sta2x11_mfd_tbl);