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MTD: merge 3.18 development into -next development
[karo-tx-linux.git] / arch / arm / mach-orion5x / ts78xx-setup.c
1 /*
2  * arch/arm/mach-orion5x/ts78xx-setup.c
3  *
4  * Maintainer: Alexander Clouter <alex@digriz.org.uk>
5  *
6  * This file is licensed under the terms of the GNU General Public
7  * License version 2.  This program is licensed "as is" without any
8  * warranty of any kind, whether express or implied.
9  */
10
11 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
12
13 #include <linux/kernel.h>
14 #include <linux/init.h>
15 #include <linux/sysfs.h>
16 #include <linux/platform_device.h>
17 #include <linux/mv643xx_eth.h>
18 #include <linux/ata_platform.h>
19 #include <linux/m48t86.h>
20 #include <linux/mtd/nand.h>
21 #include <linux/mtd/partitions.h>
22 #include <linux/timeriomem-rng.h>
23 #include <asm/mach-types.h>
24 #include <asm/mach/arch.h>
25 #include <asm/mach/map.h>
26 #include <mach/orion5x.h>
27 #include "common.h"
28 #include "mpp.h"
29 #include "ts78xx-fpga.h"
30
31 /*****************************************************************************
32  * TS-78xx Info
33  ****************************************************************************/
34
35 /*
36  * FPGA - lives where the PCI bus would be at ORION5X_PCI_MEM_PHYS_BASE
37  */
38 #define TS78XX_FPGA_REGS_PHYS_BASE      0xe8000000
39 #define TS78XX_FPGA_REGS_VIRT_BASE      IOMEM(0xff900000)
40 #define TS78XX_FPGA_REGS_SIZE           SZ_1M
41
42 static struct ts78xx_fpga_data ts78xx_fpga = {
43         .id             = 0,
44         .state          = 1,
45 /*      .supports       = ... - populated by ts78xx_fpga_supports() */
46 };
47
48 /*****************************************************************************
49  * I/O Address Mapping
50  ****************************************************************************/
51 static struct map_desc ts78xx_io_desc[] __initdata = {
52         {
53                 .virtual        = (unsigned long)TS78XX_FPGA_REGS_VIRT_BASE,
54                 .pfn            = __phys_to_pfn(TS78XX_FPGA_REGS_PHYS_BASE),
55                 .length         = TS78XX_FPGA_REGS_SIZE,
56                 .type           = MT_DEVICE,
57         },
58 };
59
60 static void __init ts78xx_map_io(void)
61 {
62         orion5x_map_io();
63         iotable_init(ts78xx_io_desc, ARRAY_SIZE(ts78xx_io_desc));
64 }
65
66 /*****************************************************************************
67  * Ethernet
68  ****************************************************************************/
69 static struct mv643xx_eth_platform_data ts78xx_eth_data = {
70         .phy_addr       = MV643XX_ETH_PHY_ADDR(0),
71 };
72
73 /*****************************************************************************
74  * SATA
75  ****************************************************************************/
76 static struct mv_sata_platform_data ts78xx_sata_data = {
77         .n_ports        = 2,
78 };
79
80 /*****************************************************************************
81  * RTC M48T86 - nicked^Wborrowed from arch/arm/mach-ep93xx/ts72xx.c
82  ****************************************************************************/
83 #define TS_RTC_CTRL     (TS78XX_FPGA_REGS_VIRT_BASE + 0x808)
84 #define TS_RTC_DATA     (TS78XX_FPGA_REGS_VIRT_BASE + 0x80c)
85
86 static unsigned char ts78xx_ts_rtc_readbyte(unsigned long addr)
87 {
88         writeb(addr, TS_RTC_CTRL);
89         return readb(TS_RTC_DATA);
90 }
91
92 static void ts78xx_ts_rtc_writebyte(unsigned char value, unsigned long addr)
93 {
94         writeb(addr, TS_RTC_CTRL);
95         writeb(value, TS_RTC_DATA);
96 }
97
98 static struct m48t86_ops ts78xx_ts_rtc_ops = {
99         .readbyte       = ts78xx_ts_rtc_readbyte,
100         .writebyte      = ts78xx_ts_rtc_writebyte,
101 };
102
103 static struct platform_device ts78xx_ts_rtc_device = {
104         .name           = "rtc-m48t86",
105         .id             = -1,
106         .dev            = {
107                 .platform_data  = &ts78xx_ts_rtc_ops,
108         },
109         .num_resources  = 0,
110 };
111
112 /*
113  * TS uses some of the user storage space on the RTC chip so see if it is
114  * present; as it's an optional feature at purchase time and not all boards
115  * will have it present
116  *
117  * I've used the method TS use in their rtc7800.c example for the detection
118  *
119  * TODO: track down a guinea pig without an RTC to see if we can work out a
120  *              better RTC detection routine
121  */
122 static int ts78xx_ts_rtc_load(void)
123 {
124         int rc;
125         unsigned char tmp_rtc0, tmp_rtc1;
126
127         tmp_rtc0 = ts78xx_ts_rtc_readbyte(126);
128         tmp_rtc1 = ts78xx_ts_rtc_readbyte(127);
129
130         ts78xx_ts_rtc_writebyte(0x00, 126);
131         ts78xx_ts_rtc_writebyte(0x55, 127);
132         if (ts78xx_ts_rtc_readbyte(127) == 0x55) {
133                 ts78xx_ts_rtc_writebyte(0xaa, 127);
134                 if (ts78xx_ts_rtc_readbyte(127) == 0xaa
135                                 && ts78xx_ts_rtc_readbyte(126) == 0x00) {
136                         ts78xx_ts_rtc_writebyte(tmp_rtc0, 126);
137                         ts78xx_ts_rtc_writebyte(tmp_rtc1, 127);
138
139                         if (ts78xx_fpga.supports.ts_rtc.init == 0) {
140                                 rc = platform_device_register(&ts78xx_ts_rtc_device);
141                                 if (!rc)
142                                         ts78xx_fpga.supports.ts_rtc.init = 1;
143                         } else
144                                 rc = platform_device_add(&ts78xx_ts_rtc_device);
145
146                         if (rc)
147                                 pr_info("RTC could not be registered: %d\n",
148                                         rc);
149                         return rc;
150                 }
151         }
152
153         pr_info("RTC not found\n");
154         return -ENODEV;
155 };
156
157 static void ts78xx_ts_rtc_unload(void)
158 {
159         platform_device_del(&ts78xx_ts_rtc_device);
160 }
161
162 /*****************************************************************************
163  * NAND Flash
164  ****************************************************************************/
165 #define TS_NAND_CTRL    (TS78XX_FPGA_REGS_VIRT_BASE + 0x800)    /* VIRT */
166 #define TS_NAND_DATA    (TS78XX_FPGA_REGS_PHYS_BASE + 0x804)    /* PHYS */
167
168 /*
169  * hardware specific access to control-lines
170  *
171  * ctrl:
172  * NAND_NCE: bit 0 -> bit 2
173  * NAND_CLE: bit 1 -> bit 1
174  * NAND_ALE: bit 2 -> bit 0
175  */
176 static void ts78xx_ts_nand_cmd_ctrl(struct mtd_info *mtd, int cmd,
177                         unsigned int ctrl)
178 {
179         struct nand_chip *this = mtd->priv;
180
181         if (ctrl & NAND_CTRL_CHANGE) {
182                 unsigned char bits;
183
184                 bits = (ctrl & NAND_NCE) << 2;
185                 bits |= ctrl & NAND_CLE;
186                 bits |= (ctrl & NAND_ALE) >> 2;
187
188                 writeb((readb(TS_NAND_CTRL) & ~0x7) | bits, TS_NAND_CTRL);
189         }
190
191         if (cmd != NAND_CMD_NONE)
192                 writeb(cmd, this->IO_ADDR_W);
193 }
194
195 static int ts78xx_ts_nand_dev_ready(struct mtd_info *mtd)
196 {
197         return readb(TS_NAND_CTRL) & 0x20;
198 }
199
200 static void ts78xx_ts_nand_write_buf(struct mtd_info *mtd,
201                         const uint8_t *buf, int len)
202 {
203         struct nand_chip *chip = mtd->priv;
204         void __iomem *io_base = chip->IO_ADDR_W;
205         unsigned long off = ((unsigned long)buf & 3);
206         int sz;
207
208         if (off) {
209                 sz = min_t(int, 4 - off, len);
210                 writesb(io_base, buf, sz);
211                 buf += sz;
212                 len -= sz;
213         }
214
215         sz = len >> 2;
216         if (sz) {
217                 u32 *buf32 = (u32 *)buf;
218                 writesl(io_base, buf32, sz);
219                 buf += sz << 2;
220                 len -= sz << 2;
221         }
222
223         if (len)
224                 writesb(io_base, buf, len);
225 }
226
227 static void ts78xx_ts_nand_read_buf(struct mtd_info *mtd,
228                         uint8_t *buf, int len)
229 {
230         struct nand_chip *chip = mtd->priv;
231         void __iomem *io_base = chip->IO_ADDR_R;
232         unsigned long off = ((unsigned long)buf & 3);
233         int sz;
234
235         if (off) {
236                 sz = min_t(int, 4 - off, len);
237                 readsb(io_base, buf, sz);
238                 buf += sz;
239                 len -= sz;
240         }
241
242         sz = len >> 2;
243         if (sz) {
244                 u32 *buf32 = (u32 *)buf;
245                 readsl(io_base, buf32, sz);
246                 buf += sz << 2;
247                 len -= sz << 2;
248         }
249
250         if (len)
251                 readsb(io_base, buf, len);
252 }
253
254 static struct mtd_partition ts78xx_ts_nand_parts[] = {
255         {
256                 .name           = "mbr",
257                 .offset         = 0,
258                 .size           = SZ_128K,
259                 .mask_flags     = MTD_WRITEABLE,
260         }, {
261                 .name           = "kernel",
262                 .offset         = MTDPART_OFS_APPEND,
263                 .size           = SZ_4M,
264         }, {
265                 .name           = "initrd",
266                 .offset         = MTDPART_OFS_APPEND,
267                 .size           = SZ_4M,
268         }, {
269                 .name           = "rootfs",
270                 .offset         = MTDPART_OFS_APPEND,
271                 .size           = MTDPART_SIZ_FULL,
272         }
273 };
274
275 static struct platform_nand_data ts78xx_ts_nand_data = {
276         .chip   = {
277                 .nr_chips               = 1,
278                 .partitions             = ts78xx_ts_nand_parts,
279                 .nr_partitions          = ARRAY_SIZE(ts78xx_ts_nand_parts),
280                 .chip_delay             = 15,
281                 .bbt_options            = NAND_BBT_USE_FLASH,
282         },
283         .ctrl   = {
284                 /*
285                  * The HW ECC offloading functions, used to give about a 9%
286                  * performance increase for 'dd if=/dev/mtdblockX' and 5% for
287                  * nanddump.  This all however was changed by git commit
288                  * e6cf5df1838c28bb060ac45b5585e48e71bbc740 so now there is
289                  * no performance advantage to be had so we no longer bother
290                  */
291                 .cmd_ctrl               = ts78xx_ts_nand_cmd_ctrl,
292                 .dev_ready              = ts78xx_ts_nand_dev_ready,
293                 .write_buf              = ts78xx_ts_nand_write_buf,
294                 .read_buf               = ts78xx_ts_nand_read_buf,
295         },
296 };
297
298 static struct resource ts78xx_ts_nand_resources
299                         = DEFINE_RES_MEM(TS_NAND_DATA, 4);
300
301 static struct platform_device ts78xx_ts_nand_device = {
302         .name           = "gen_nand",
303         .id             = -1,
304         .dev            = {
305                 .platform_data  = &ts78xx_ts_nand_data,
306         },
307         .resource       = &ts78xx_ts_nand_resources,
308         .num_resources  = 1,
309 };
310
311 static int ts78xx_ts_nand_load(void)
312 {
313         int rc;
314
315         if (ts78xx_fpga.supports.ts_nand.init == 0) {
316                 rc = platform_device_register(&ts78xx_ts_nand_device);
317                 if (!rc)
318                         ts78xx_fpga.supports.ts_nand.init = 1;
319         } else
320                 rc = platform_device_add(&ts78xx_ts_nand_device);
321
322         if (rc)
323                 pr_info("NAND could not be registered: %d\n", rc);
324         return rc;
325 };
326
327 static void ts78xx_ts_nand_unload(void)
328 {
329         platform_device_del(&ts78xx_ts_nand_device);
330 }
331
332 /*****************************************************************************
333  * HW RNG
334  ****************************************************************************/
335 #define TS_RNG_DATA     (TS78XX_FPGA_REGS_PHYS_BASE | 0x044)
336
337 static struct resource ts78xx_ts_rng_resource
338                         = DEFINE_RES_MEM(TS_RNG_DATA, 4);
339
340 static struct timeriomem_rng_data ts78xx_ts_rng_data = {
341         .period         = 1000000, /* one second */
342 };
343
344 static struct platform_device ts78xx_ts_rng_device = {
345         .name           = "timeriomem_rng",
346         .id             = -1,
347         .dev            = {
348                 .platform_data  = &ts78xx_ts_rng_data,
349         },
350         .resource       = &ts78xx_ts_rng_resource,
351         .num_resources  = 1,
352 };
353
354 static int ts78xx_ts_rng_load(void)
355 {
356         int rc;
357
358         if (ts78xx_fpga.supports.ts_rng.init == 0) {
359                 rc = platform_device_register(&ts78xx_ts_rng_device);
360                 if (!rc)
361                         ts78xx_fpga.supports.ts_rng.init = 1;
362         } else
363                 rc = platform_device_add(&ts78xx_ts_rng_device);
364
365         if (rc)
366                 pr_info("RNG could not be registered: %d\n", rc);
367         return rc;
368 };
369
370 static void ts78xx_ts_rng_unload(void)
371 {
372         platform_device_del(&ts78xx_ts_rng_device);
373 }
374
375 /*****************************************************************************
376  * FPGA 'hotplug' support code
377  ****************************************************************************/
378 static void ts78xx_fpga_devices_zero_init(void)
379 {
380         ts78xx_fpga.supports.ts_rtc.init = 0;
381         ts78xx_fpga.supports.ts_nand.init = 0;
382         ts78xx_fpga.supports.ts_rng.init = 0;
383 }
384
385 static void ts78xx_fpga_supports(void)
386 {
387         /* TODO: put this 'table' into ts78xx-fpga.h */
388         switch (ts78xx_fpga.id) {
389         case TS7800_REV_1:
390         case TS7800_REV_2:
391         case TS7800_REV_3:
392         case TS7800_REV_4:
393         case TS7800_REV_5:
394         case TS7800_REV_6:
395         case TS7800_REV_7:
396         case TS7800_REV_8:
397         case TS7800_REV_9:
398                 ts78xx_fpga.supports.ts_rtc.present = 1;
399                 ts78xx_fpga.supports.ts_nand.present = 1;
400                 ts78xx_fpga.supports.ts_rng.present = 1;
401                 break;
402         default:
403                 /* enable devices if magic matches */
404                 switch ((ts78xx_fpga.id >> 8) & 0xffffff) {
405                 case TS7800_FPGA_MAGIC:
406                         pr_warn("unrecognised FPGA revision 0x%.2x\n",
407                                 ts78xx_fpga.id & 0xff);
408                         ts78xx_fpga.supports.ts_rtc.present = 1;
409                         ts78xx_fpga.supports.ts_nand.present = 1;
410                         ts78xx_fpga.supports.ts_rng.present = 1;
411                         break;
412                 default:
413                         ts78xx_fpga.supports.ts_rtc.present = 0;
414                         ts78xx_fpga.supports.ts_nand.present = 0;
415                         ts78xx_fpga.supports.ts_rng.present = 0;
416                 }
417         }
418 }
419
420 static int ts78xx_fpga_load_devices(void)
421 {
422         int tmp, ret = 0;
423
424         if (ts78xx_fpga.supports.ts_rtc.present == 1) {
425                 tmp = ts78xx_ts_rtc_load();
426                 if (tmp)
427                         ts78xx_fpga.supports.ts_rtc.present = 0;
428                 ret |= tmp;
429         }
430         if (ts78xx_fpga.supports.ts_nand.present == 1) {
431                 tmp = ts78xx_ts_nand_load();
432                 if (tmp)
433                         ts78xx_fpga.supports.ts_nand.present = 0;
434                 ret |= tmp;
435         }
436         if (ts78xx_fpga.supports.ts_rng.present == 1) {
437                 tmp = ts78xx_ts_rng_load();
438                 if (tmp)
439                         ts78xx_fpga.supports.ts_rng.present = 0;
440                 ret |= tmp;
441         }
442
443         return ret;
444 }
445
446 static int ts78xx_fpga_unload_devices(void)
447 {
448         int ret = 0;
449
450         if (ts78xx_fpga.supports.ts_rtc.present == 1)
451                 ts78xx_ts_rtc_unload();
452         if (ts78xx_fpga.supports.ts_nand.present == 1)
453                 ts78xx_ts_nand_unload();
454         if (ts78xx_fpga.supports.ts_rng.present == 1)
455                 ts78xx_ts_rng_unload();
456
457         return ret;
458 }
459
460 static int ts78xx_fpga_load(void)
461 {
462         ts78xx_fpga.id = readl(TS78XX_FPGA_REGS_VIRT_BASE);
463
464         pr_info("FPGA magic=0x%.6x, rev=0x%.2x\n",
465                         (ts78xx_fpga.id >> 8) & 0xffffff,
466                         ts78xx_fpga.id & 0xff);
467
468         ts78xx_fpga_supports();
469
470         if (ts78xx_fpga_load_devices()) {
471                 ts78xx_fpga.state = -1;
472                 return -EBUSY;
473         }
474
475         return 0;
476 };
477
478 static int ts78xx_fpga_unload(void)
479 {
480         unsigned int fpga_id;
481
482         fpga_id = readl(TS78XX_FPGA_REGS_VIRT_BASE);
483
484         /*
485          * There does not seem to be a feasible way to block access to the GPIO
486          * pins from userspace (/dev/mem).  This if clause should hopefully warn
487          * those foolish enough not to follow 'policy' :)
488          *
489          * UrJTAG SVN since r1381 can be used to reprogram the FPGA
490          */
491         if (ts78xx_fpga.id != fpga_id) {
492                 pr_err("FPGA magic/rev mismatch\n"
493                         "TS-78xx FPGA: was 0x%.6x/%.2x but now 0x%.6x/%.2x\n",
494                         (ts78xx_fpga.id >> 8) & 0xffffff, ts78xx_fpga.id & 0xff,
495                         (fpga_id >> 8) & 0xffffff, fpga_id & 0xff);
496                 ts78xx_fpga.state = -1;
497                 return -EBUSY;
498         }
499
500         if (ts78xx_fpga_unload_devices()) {
501                 ts78xx_fpga.state = -1;
502                 return -EBUSY;
503         }
504
505         return 0;
506 };
507
508 static ssize_t ts78xx_fpga_show(struct kobject *kobj,
509                         struct kobj_attribute *attr, char *buf)
510 {
511         if (ts78xx_fpga.state < 0)
512                 return sprintf(buf, "borked\n");
513
514         return sprintf(buf, "%s\n", (ts78xx_fpga.state) ? "online" : "offline");
515 }
516
517 static ssize_t ts78xx_fpga_store(struct kobject *kobj,
518                         struct kobj_attribute *attr, const char *buf, size_t n)
519 {
520         int value, ret;
521
522         if (ts78xx_fpga.state < 0) {
523                 pr_err("FPGA borked, you must powercycle ASAP\n");
524                 return -EBUSY;
525         }
526
527         if (strncmp(buf, "online", sizeof("online") - 1) == 0)
528                 value = 1;
529         else if (strncmp(buf, "offline", sizeof("offline") - 1) == 0)
530                 value = 0;
531         else
532                 return -EINVAL;
533
534         if (ts78xx_fpga.state == value)
535                 return n;
536
537         ret = (ts78xx_fpga.state == 0)
538                 ? ts78xx_fpga_load()
539                 : ts78xx_fpga_unload();
540
541         if (!(ret < 0))
542                 ts78xx_fpga.state = value;
543
544         return n;
545 }
546
547 static struct kobj_attribute ts78xx_fpga_attr =
548         __ATTR(ts78xx_fpga, 0644, ts78xx_fpga_show, ts78xx_fpga_store);
549
550 /*****************************************************************************
551  * General Setup
552  ****************************************************************************/
553 static unsigned int ts78xx_mpp_modes[] __initdata = {
554         MPP0_UNUSED,
555         MPP1_GPIO,              /* JTAG Clock */
556         MPP2_GPIO,              /* JTAG Data In */
557         MPP3_GPIO,              /* Lat ECP2 256 FPGA - PB2B */
558         MPP4_GPIO,              /* JTAG Data Out */
559         MPP5_GPIO,              /* JTAG TMS */
560         MPP6_GPIO,              /* Lat ECP2 256 FPGA - PB31A_CLK4+ */
561         MPP7_GPIO,              /* Lat ECP2 256 FPGA - PB22B */
562         MPP8_UNUSED,
563         MPP9_UNUSED,
564         MPP10_UNUSED,
565         MPP11_UNUSED,
566         MPP12_UNUSED,
567         MPP13_UNUSED,
568         MPP14_UNUSED,
569         MPP15_UNUSED,
570         MPP16_UART,
571         MPP17_UART,
572         MPP18_UART,
573         MPP19_UART,
574         /*
575          * MPP[20] PCI Clock Out 1
576          * MPP[21] PCI Clock Out 0
577          * MPP[22] Unused
578          * MPP[23] Unused
579          * MPP[24] Unused
580          * MPP[25] Unused
581          */
582         0,
583 };
584
585 static void __init ts78xx_init(void)
586 {
587         int ret;
588
589         /*
590          * Setup basic Orion functions. Need to be called early.
591          */
592         orion5x_init();
593
594         orion5x_mpp_conf(ts78xx_mpp_modes);
595
596         /*
597          * Configure peripherals.
598          */
599         orion5x_ehci0_init();
600         orion5x_ehci1_init();
601         orion5x_eth_init(&ts78xx_eth_data);
602         orion5x_sata_init(&ts78xx_sata_data);
603         orion5x_uart0_init();
604         orion5x_uart1_init();
605         orion5x_xor_init();
606
607         /* FPGA init */
608         ts78xx_fpga_devices_zero_init();
609         ret = ts78xx_fpga_load();
610         ret = sysfs_create_file(firmware_kobj, &ts78xx_fpga_attr.attr);
611         if (ret)
612                 pr_err("sysfs_create_file failed: %d\n", ret);
613 }
614
615 MACHINE_START(TS78XX, "Technologic Systems TS-78xx SBC")
616         /* Maintainer: Alexander Clouter <alex@digriz.org.uk> */
617         .atag_offset    = 0x100,
618         .init_machine   = ts78xx_init,
619         .map_io         = ts78xx_map_io,
620         .init_early     = orion5x_init_early,
621         .init_irq       = orion5x_init_irq,
622         .init_time      = orion5x_timer_init,
623         .restart        = orion5x_restart,
624 MACHINE_END