2 * Freescale MPC85xx/MPC86xx RapidIO support
4 * Copyright 2009 Sysgo AG
6 * - fixed maintenance access routines, check for aligned access
8 * Copyright 2009 Integrated Device Technology, Inc.
10 * - Added Port-Write message handling
11 * - Added Machine Check exception handling
13 * Copyright (C) 2007, 2008, 2010, 2011 Freescale Semiconductor, Inc.
16 * Copyright 2005 MontaVista Software, Inc.
19 * This program is free software; you can redistribute it and/or modify it
20 * under the terms of the GNU General Public License as published by the
21 * Free Software Foundation; either version 2 of the License, or (at your
22 * option) any later version.
25 #include <linux/init.h>
26 #include <linux/extable.h>
27 #include <linux/types.h>
28 #include <linux/dma-mapping.h>
29 #include <linux/interrupt.h>
30 #include <linux/device.h>
31 #include <linux/of_address.h>
32 #include <linux/of_irq.h>
33 #include <linux/of_platform.h>
34 #include <linux/delay.h>
35 #include <linux/slab.h>
38 #include <linux/uaccess.h>
39 #include <asm/machdep.h>
43 #undef DEBUG_PW /* Port-Write debugging */
45 #define RIO_PORT1_EDCSR 0x0640
46 #define RIO_PORT2_EDCSR 0x0680
47 #define RIO_PORT1_IECSR 0x10130
48 #define RIO_PORT2_IECSR 0x101B0
50 #define RIO_GCCSR 0x13c
51 #define RIO_ESCSR 0x158
52 #define ESCSR_CLEAR 0x07120204
53 #define RIO_PORT2_ESCSR 0x178
54 #define RIO_CCSR 0x15c
55 #define RIO_LTLEDCSR_IER 0x80000000
56 #define RIO_LTLEDCSR_PRT 0x01000000
57 #define IECSR_CLEAR 0x80000000
58 #define RIO_ISR_AACR 0x10120
59 #define RIO_ISR_AACR_AA 0x1 /* Accept All ID */
61 #define RIWTAR_TRAD_VAL_SHIFT 12
62 #define RIWTAR_TRAD_MASK 0x00FFFFFF
63 #define RIWBAR_BADD_VAL_SHIFT 12
64 #define RIWBAR_BADD_MASK 0x003FFFFF
65 #define RIWAR_ENABLE 0x80000000
66 #define RIWAR_TGINT_LOCAL 0x00F00000
67 #define RIWAR_RDTYP_NO_SNOOP 0x00040000
68 #define RIWAR_RDTYP_SNOOP 0x00050000
69 #define RIWAR_WRTYP_NO_SNOOP 0x00004000
70 #define RIWAR_WRTYP_SNOOP 0x00005000
71 #define RIWAR_WRTYP_ALLOC 0x00006000
72 #define RIWAR_SIZE_MASK 0x0000003F
74 #define __fsl_read_rio_config(x, addr, err, op) \
75 __asm__ __volatile__( \
76 "1: "op" %1,0(%2)\n" \
79 ".section .fixup,\"ax\"\n" \
85 : "=r" (err), "=r" (x) \
86 : "b" (addr), "i" (-EFAULT), "0" (err))
88 void __iomem *rio_regs_win;
89 void __iomem *rmu_regs_win;
90 resource_size_t rio_law_start;
92 struct fsl_rio_dbell *dbell;
93 struct fsl_rio_pw *pw;
96 int fsl_rio_mcheck_exception(struct pt_regs *regs)
98 const struct exception_table_entry *entry;
104 reason = in_be32((u32 *)(rio_regs_win + RIO_LTLEDCSR));
105 if (reason & (RIO_LTLEDCSR_IER | RIO_LTLEDCSR_PRT)) {
106 /* Check if we are prepared to handle this fault */
107 entry = search_exception_tables(regs->nip);
109 pr_debug("RIO: %s - MC Exception handled\n",
111 out_be32((u32 *)(rio_regs_win + RIO_LTLEDCSR),
114 regs->nip = extable_fixup(entry);
121 EXPORT_SYMBOL_GPL(fsl_rio_mcheck_exception);
125 * fsl_local_config_read - Generate a MPC85xx local config space read
126 * @mport: RapidIO master port info
127 * @index: ID of RapdiIO interface
128 * @offset: Offset into configuration space
129 * @len: Length (in bytes) of the maintenance transaction
130 * @data: Value to be read into
132 * Generates a MPC85xx local configuration space read. Returns %0 on
133 * success or %-EINVAL on failure.
135 static int fsl_local_config_read(struct rio_mport *mport,
136 int index, u32 offset, int len, u32 *data)
138 struct rio_priv *priv = mport->priv;
139 pr_debug("fsl_local_config_read: index %d offset %8.8x\n", index,
141 *data = in_be32(priv->regs_win + offset);
147 * fsl_local_config_write - Generate a MPC85xx local config space write
148 * @mport: RapidIO master port info
149 * @index: ID of RapdiIO interface
150 * @offset: Offset into configuration space
151 * @len: Length (in bytes) of the maintenance transaction
152 * @data: Value to be written
154 * Generates a MPC85xx local configuration space write. Returns %0 on
155 * success or %-EINVAL on failure.
157 static int fsl_local_config_write(struct rio_mport *mport,
158 int index, u32 offset, int len, u32 data)
160 struct rio_priv *priv = mport->priv;
162 ("fsl_local_config_write: index %d offset %8.8x data %8.8x\n",
163 index, offset, data);
164 out_be32(priv->regs_win + offset, data);
170 * fsl_rio_config_read - Generate a MPC85xx read maintenance transaction
171 * @mport: RapidIO master port info
172 * @index: ID of RapdiIO interface
173 * @destid: Destination ID of transaction
174 * @hopcount: Number of hops to target device
175 * @offset: Offset into configuration space
176 * @len: Length (in bytes) of the maintenance transaction
177 * @val: Location to be read into
179 * Generates a MPC85xx read maintenance transaction. Returns %0 on
180 * success or %-EINVAL on failure.
183 fsl_rio_config_read(struct rio_mport *mport, int index, u16 destid,
184 u8 hopcount, u32 offset, int len, u32 *val)
186 struct rio_priv *priv = mport->priv;
191 ("fsl_rio_config_read:"
192 " index %d destid %d hopcount %d offset %8.8x len %d\n",
193 index, destid, hopcount, offset, len);
195 /* 16MB maintenance window possible */
196 /* allow only aligned access to maintenance registers */
197 if (offset > (0x1000000 - len) || !IS_ALIGNED(offset, len))
200 out_be32(&priv->maint_atmu_regs->rowtar,
201 (destid << 22) | (hopcount << 12) | (offset >> 12));
202 out_be32(&priv->maint_atmu_regs->rowtear, (destid >> 10));
204 data = (u8 *) priv->maint_win + (offset & (RIO_MAINT_WIN_SIZE - 1));
207 __fsl_read_rio_config(rval, data, err, "lbz");
210 __fsl_read_rio_config(rval, data, err, "lhz");
213 __fsl_read_rio_config(rval, data, err, "lwz");
220 pr_debug("RIO: cfg_read error %d for %x:%x:%x\n",
221 err, destid, hopcount, offset);
230 * fsl_rio_config_write - Generate a MPC85xx write maintenance transaction
231 * @mport: RapidIO master port info
232 * @index: ID of RapdiIO interface
233 * @destid: Destination ID of transaction
234 * @hopcount: Number of hops to target device
235 * @offset: Offset into configuration space
236 * @len: Length (in bytes) of the maintenance transaction
237 * @val: Value to be written
239 * Generates an MPC85xx write maintenance transaction. Returns %0 on
240 * success or %-EINVAL on failure.
243 fsl_rio_config_write(struct rio_mport *mport, int index, u16 destid,
244 u8 hopcount, u32 offset, int len, u32 val)
246 struct rio_priv *priv = mport->priv;
249 ("fsl_rio_config_write:"
250 " index %d destid %d hopcount %d offset %8.8x len %d val %8.8x\n",
251 index, destid, hopcount, offset, len, val);
253 /* 16MB maintenance windows possible */
254 /* allow only aligned access to maintenance registers */
255 if (offset > (0x1000000 - len) || !IS_ALIGNED(offset, len))
258 out_be32(&priv->maint_atmu_regs->rowtar,
259 (destid << 22) | (hopcount << 12) | (offset >> 12));
260 out_be32(&priv->maint_atmu_regs->rowtear, (destid >> 10));
262 data = (u8 *) priv->maint_win + (offset & (RIO_MAINT_WIN_SIZE - 1));
265 out_8((u8 *) data, val);
268 out_be16((u16 *) data, val);
271 out_be32((u32 *) data, val);
280 static void fsl_rio_inbound_mem_init(struct rio_priv *priv)
284 /* close inbound windows */
285 for (i = 0; i < RIO_INB_ATMU_COUNT; i++)
286 out_be32(&priv->inb_atmu_regs[i].riwar, 0);
289 int fsl_map_inb_mem(struct rio_mport *mport, dma_addr_t lstart,
290 u64 rstart, u64 size, u32 flags)
292 struct rio_priv *priv = mport->priv;
294 unsigned int base_size_log;
295 u64 win_start, win_end;
299 if ((size & (size - 1)) != 0 || size > 0x400000000ULL)
302 base_size_log = ilog2(size);
303 base_size = 1 << base_size_log;
305 /* check if addresses are aligned with the window size */
306 if (lstart & (base_size - 1))
308 if (rstart & (base_size - 1))
311 /* check for conflicting ranges */
312 for (i = 0; i < RIO_INB_ATMU_COUNT; i++) {
313 riwar = in_be32(&priv->inb_atmu_regs[i].riwar);
314 if ((riwar & RIWAR_ENABLE) == 0)
316 win_start = ((u64)(in_be32(&priv->inb_atmu_regs[i].riwbar) & RIWBAR_BADD_MASK))
317 << RIWBAR_BADD_VAL_SHIFT;
318 win_end = win_start + ((1 << ((riwar & RIWAR_SIZE_MASK) + 1)) - 1);
319 if (rstart < win_end && (rstart + size) > win_start)
323 /* find unused atmu */
324 for (i = 0; i < RIO_INB_ATMU_COUNT; i++) {
325 riwar = in_be32(&priv->inb_atmu_regs[i].riwar);
326 if ((riwar & RIWAR_ENABLE) == 0)
329 if (i >= RIO_INB_ATMU_COUNT)
332 out_be32(&priv->inb_atmu_regs[i].riwtar, lstart >> RIWTAR_TRAD_VAL_SHIFT);
333 out_be32(&priv->inb_atmu_regs[i].riwbar, rstart >> RIWBAR_BADD_VAL_SHIFT);
334 out_be32(&priv->inb_atmu_regs[i].riwar, RIWAR_ENABLE | RIWAR_TGINT_LOCAL |
335 RIWAR_RDTYP_SNOOP | RIWAR_WRTYP_SNOOP | (base_size_log - 1));
340 void fsl_unmap_inb_mem(struct rio_mport *mport, dma_addr_t lstart)
342 u32 win_start_shift, base_start_shift;
343 struct rio_priv *priv = mport->priv;
347 /* skip default window */
348 base_start_shift = lstart >> RIWTAR_TRAD_VAL_SHIFT;
349 for (i = 0; i < RIO_INB_ATMU_COUNT; i++) {
350 riwar = in_be32(&priv->inb_atmu_regs[i].riwar);
351 if ((riwar & RIWAR_ENABLE) == 0)
354 riwtar = in_be32(&priv->inb_atmu_regs[i].riwtar);
355 win_start_shift = riwtar & RIWTAR_TRAD_MASK;
356 if (win_start_shift == base_start_shift) {
357 out_be32(&priv->inb_atmu_regs[i].riwar, riwar & ~RIWAR_ENABLE);
363 void fsl_rio_port_error_handler(int offset)
365 /*XXX: Error recovery is not implemented, we just clear errors */
366 out_be32((u32 *)(rio_regs_win + RIO_LTLEDCSR), 0);
369 out_be32((u32 *)(rio_regs_win + RIO_PORT1_EDCSR), 0);
370 out_be32((u32 *)(rio_regs_win + RIO_PORT1_IECSR), IECSR_CLEAR);
371 out_be32((u32 *)(rio_regs_win + RIO_ESCSR), ESCSR_CLEAR);
373 out_be32((u32 *)(rio_regs_win + RIO_PORT2_EDCSR), 0);
374 out_be32((u32 *)(rio_regs_win + RIO_PORT2_IECSR), IECSR_CLEAR);
375 out_be32((u32 *)(rio_regs_win + RIO_PORT2_ESCSR), ESCSR_CLEAR);
378 static inline void fsl_rio_info(struct device *dev, u32 ccsr)
383 switch (ccsr >> 30) {
394 dev_info(dev, "Hardware port width: %s\n", str);
396 switch ((ccsr >> 27) & 7) {
398 str = "Single-lane 0";
401 str = "Single-lane 2";
410 dev_info(dev, "Training connection status: %s\n", str);
413 if (!(ccsr & 0x80000000))
414 dev_info(dev, "Output port operating in 8-bit mode\n");
415 if (!(ccsr & 0x08000000))
416 dev_info(dev, "Input port operating in 8-bit mode\n");
421 * fsl_rio_setup - Setup Freescale PowerPC RapidIO interface
422 * @dev: platform_device pointer
424 * Initializes MPC85xx RapidIO hardware interface, configures
425 * master port with system-specific info, and registers the
426 * master port with the RapidIO subsystem.
428 int fsl_rio_setup(struct platform_device *dev)
431 struct rio_mport *port;
432 struct rio_priv *priv;
434 const u32 *dt_range, *cell, *port_index;
435 u32 active_ports = 0;
436 struct resource regs, rmu_regs;
437 struct device_node *np, *rmu_node;
440 u64 range_start, range_size;
444 struct device_node *rmu_np[MAX_MSG_UNIT_NUM] = {NULL};
446 if (!dev->dev.of_node) {
447 dev_err(&dev->dev, "Device OF-Node is NULL");
451 rc = of_address_to_resource(dev->dev.of_node, 0, ®s);
453 dev_err(&dev->dev, "Can't get %s property 'reg'\n",
454 dev->dev.of_node->full_name);
457 dev_info(&dev->dev, "Of-device full name %s\n",
458 dev->dev.of_node->full_name);
459 dev_info(&dev->dev, "Regs: %pR\n", ®s);
461 rio_regs_win = ioremap(regs.start, resource_size(®s));
463 dev_err(&dev->dev, "Unable to map rio register window\n");
468 ops = kzalloc(sizeof(struct rio_ops), GFP_KERNEL);
473 ops->lcread = fsl_local_config_read;
474 ops->lcwrite = fsl_local_config_write;
475 ops->cread = fsl_rio_config_read;
476 ops->cwrite = fsl_rio_config_write;
477 ops->dsend = fsl_rio_doorbell_send;
478 ops->pwenable = fsl_rio_pw_enable;
479 ops->open_outb_mbox = fsl_open_outb_mbox;
480 ops->open_inb_mbox = fsl_open_inb_mbox;
481 ops->close_outb_mbox = fsl_close_outb_mbox;
482 ops->close_inb_mbox = fsl_close_inb_mbox;
483 ops->add_outb_message = fsl_add_outb_message;
484 ops->add_inb_buffer = fsl_add_inb_buffer;
485 ops->get_inb_message = fsl_get_inb_message;
486 ops->map_inb = fsl_map_inb_mem;
487 ops->unmap_inb = fsl_unmap_inb_mem;
489 rmu_node = of_parse_phandle(dev->dev.of_node, "fsl,srio-rmu-handle", 0);
491 dev_err(&dev->dev, "No valid fsl,srio-rmu-handle property\n");
495 rc = of_address_to_resource(rmu_node, 0, &rmu_regs);
497 dev_err(&dev->dev, "Can't get %s property 'reg'\n",
498 rmu_node->full_name);
501 rmu_regs_win = ioremap(rmu_regs.start, resource_size(&rmu_regs));
503 dev_err(&dev->dev, "Unable to map rmu register window\n");
507 for_each_compatible_node(np, NULL, "fsl,srio-msg-unit") {
512 /*set up doobell node*/
513 np = of_find_compatible_node(NULL, NULL, "fsl,srio-dbell-unit");
515 dev_err(&dev->dev, "No fsl,srio-dbell-unit node\n");
519 dbell = kzalloc(sizeof(struct fsl_rio_dbell), GFP_KERNEL);
521 dev_err(&dev->dev, "Can't alloc memory for 'fsl_rio_dbell'\n");
525 dbell->dev = &dev->dev;
526 dbell->bellirq = irq_of_parse_and_map(np, 1);
527 dev_info(&dev->dev, "bellirq: %d\n", dbell->bellirq);
529 aw = of_n_addr_cells(np);
530 dt_range = of_get_property(np, "reg", &rlen);
532 pr_err("%s: unable to find 'reg' property\n",
537 range_start = of_read_number(dt_range, aw);
538 dbell->dbell_regs = (struct rio_dbell_regs *)(rmu_regs_win +
541 /*set up port write node*/
542 np = of_find_compatible_node(NULL, NULL, "fsl,srio-port-write-unit");
544 dev_err(&dev->dev, "No fsl,srio-port-write-unit node\n");
548 pw = kzalloc(sizeof(struct fsl_rio_pw), GFP_KERNEL);
550 dev_err(&dev->dev, "Can't alloc memory for 'fsl_rio_pw'\n");
555 pw->pwirq = irq_of_parse_and_map(np, 0);
556 dev_info(&dev->dev, "pwirq: %d\n", pw->pwirq);
557 aw = of_n_addr_cells(np);
558 dt_range = of_get_property(np, "reg", &rlen);
560 pr_err("%s: unable to find 'reg' property\n",
565 range_start = of_read_number(dt_range, aw);
566 pw->pw_regs = (struct rio_pw_regs *)(rmu_regs_win + (u32)range_start);
568 /*set up ports node*/
569 for_each_child_of_node(dev->dev.of_node, np) {
570 port_index = of_get_property(np, "cell-index", NULL);
572 dev_err(&dev->dev, "Can't get %s property 'cell-index'\n",
577 dt_range = of_get_property(np, "ranges", &rlen);
579 dev_err(&dev->dev, "Can't get %s property 'ranges'\n",
584 /* Get node address wide */
585 cell = of_get_property(np, "#address-cells", NULL);
589 aw = of_n_addr_cells(np);
590 /* Get node size wide */
591 cell = of_get_property(np, "#size-cells", NULL);
595 sw = of_n_size_cells(np);
596 /* Get parent address wide wide */
597 paw = of_n_addr_cells(np);
598 range_start = of_read_number(dt_range + aw, paw);
599 range_size = of_read_number(dt_range + aw + paw, sw);
601 dev_info(&dev->dev, "%s: LAW start 0x%016llx, size 0x%016llx.\n",
602 np->full_name, range_start, range_size);
604 port = kzalloc(sizeof(struct rio_mport), GFP_KERNEL);
608 rc = rio_mport_initialize(port);
615 port->index = (unsigned char)i;
617 priv = kzalloc(sizeof(struct rio_priv), GFP_KERNEL);
619 dev_err(&dev->dev, "Can't alloc memory for 'priv'\n");
624 INIT_LIST_HEAD(&port->dbells);
625 port->iores.start = range_start;
626 port->iores.end = port->iores.start + range_size - 1;
627 port->iores.flags = IORESOURCE_MEM;
628 port->iores.name = "rio_io_win";
630 if (request_resource(&iomem_resource, &port->iores) < 0) {
631 dev_err(&dev->dev, "RIO: Error requesting master port region"
632 " 0x%016llx-0x%016llx\n",
633 (u64)port->iores.start, (u64)port->iores.end);
638 sprintf(port->name, "RIO mport %d", i);
640 priv->dev = &dev->dev;
641 port->dev.parent = &dev->dev;
644 port->phys_efptr = 0x100;
646 priv->regs_win = rio_regs_win;
648 ccsr = in_be32(priv->regs_win + RIO_CCSR + i*0x20);
650 /* Checking the port training status */
651 if (in_be32((priv->regs_win + RIO_ESCSR + i*0x20)) & 1) {
652 dev_err(&dev->dev, "Port %d is not ready. "
653 "Try to restart connection...\n", i);
655 out_be32(priv->regs_win
656 + RIO_CCSR + i*0x20, 0);
658 setbits32(priv->regs_win
659 + RIO_CCSR + i*0x20, 0x02000000);
661 setbits32(priv->regs_win
662 + RIO_CCSR + i*0x20, 0x00600000);
664 if (in_be32((priv->regs_win
665 + RIO_ESCSR + i*0x20)) & 1) {
667 "Port %d restart failed.\n", i);
668 release_resource(&port->iores);
673 dev_info(&dev->dev, "Port %d restart success!\n", i);
675 fsl_rio_info(&dev->dev, ccsr);
677 port->sys_size = (in_be32((priv->regs_win + RIO_PEF_CAR))
678 & RIO_PEF_CTLS) >> 4;
679 dev_info(&dev->dev, "RapidIO Common Transport System size: %d\n",
680 port->sys_size ? 65536 : 256);
682 if (port->host_deviceid >= 0)
683 out_be32(priv->regs_win + RIO_GCCSR, RIO_PORT_GEN_HOST |
684 RIO_PORT_GEN_MASTER | RIO_PORT_GEN_DISCOVERED);
686 out_be32(priv->regs_win + RIO_GCCSR,
687 RIO_PORT_GEN_MASTER);
689 priv->atmu_regs = (struct rio_atmu_regs *)(priv->regs_win
690 + ((i == 0) ? RIO_ATMU_REGS_PORT1_OFFSET :
691 RIO_ATMU_REGS_PORT2_OFFSET));
693 priv->maint_atmu_regs = priv->atmu_regs + 1;
694 priv->inb_atmu_regs = (struct rio_inb_atmu_regs __iomem *)
696 ((i == 0) ? RIO_INB_ATMU_REGS_PORT1_OFFSET :
697 RIO_INB_ATMU_REGS_PORT2_OFFSET));
699 /* Set to receive packets with any dest ID */
700 out_be32((priv->regs_win + RIO_ISR_AACR + i*0x80),
703 /* Configure maintenance transaction window */
704 out_be32(&priv->maint_atmu_regs->rowbar,
705 port->iores.start >> 12);
706 out_be32(&priv->maint_atmu_regs->rowar,
707 0x80077000 | (ilog2(RIO_MAINT_WIN_SIZE) - 1));
709 priv->maint_win = ioremap(port->iores.start,
712 rio_law_start = range_start;
714 fsl_rio_setup_rmu(port, rmu_np[i]);
715 fsl_rio_inbound_mem_init(priv);
717 dbell->mport[i] = port;
720 if (rio_register_mport(port)) {
721 release_resource(&port->iores);
734 fsl_rio_doorbell_init(dbell);
735 fsl_rio_port_write_init(pw);
745 iounmap(rmu_regs_win);
750 iounmap(rio_regs_win);
756 /* The probe function for RapidIO peer-to-peer network.
758 static int fsl_of_rio_rpn_probe(struct platform_device *dev)
760 printk(KERN_INFO "Setting up RapidIO peer-to-peer network %s\n",
761 dev->dev.of_node->full_name);
763 return fsl_rio_setup(dev);
766 static const struct of_device_id fsl_of_rio_rpn_ids[] = {
768 .compatible = "fsl,srio",
773 static struct platform_driver fsl_of_rio_rpn_driver = {
775 .name = "fsl-of-rio",
776 .of_match_table = fsl_of_rio_rpn_ids,
778 .probe = fsl_of_rio_rpn_probe,
781 static __init int fsl_of_rio_rpn_init(void)
783 return platform_driver_register(&fsl_of_rio_rpn_driver);
786 subsys_initcall(fsl_of_rio_rpn_init);