/arch/powerpc/platforms/cell/celleb_scc_pciex.c
C | 541 lines | 426 code | 74 blank | 41 comment | 47 complexity | a503fb477c72f1ff1e5c57a2136317d7 MD5 | raw file
Possible License(s): LGPL-2.0, AGPL-1.0, GPL-2.0
1/*
2 * Support for Celleb PCI-Express.
3 *
4 * (C) Copyright 2007-2008 TOSHIBA CORPORATION
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License along
17 * with this program; if not, write to the Free Software Foundation, Inc.,
18 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
19 */
20
21#undef DEBUG
22
23#include <linux/kernel.h>
24#include <linux/pci.h>
25#include <linux/string.h>
26#include <linux/slab.h>
27#include <linux/init.h>
28#include <linux/bootmem.h>
29#include <linux/delay.h>
30#include <linux/interrupt.h>
31
32#include <asm/io.h>
33#include <asm/irq.h>
34#include <asm/iommu.h>
35#include <asm/byteorder.h>
36
37#include "celleb_scc.h"
38#include "celleb_pci.h"
39
40#define PEX_IN(base, off) in_be32((void __iomem *)(base) + (off))
41#define PEX_OUT(base, off, data) out_be32((void __iomem *)(base) + (off), (data))
42
43static void scc_pciex_io_flush(struct iowa_bus *bus)
44{
45 (void)PEX_IN(bus->phb->cfg_addr, PEXDMRDEN0);
46}
47
48/*
49 * Memory space access to device on PCIEX
50 */
51#define PCIEX_MMIO_READ(name, ret) \
52static ret scc_pciex_##name(const PCI_IO_ADDR addr) \
53{ \
54 ret val = __do_##name(addr); \
55 scc_pciex_io_flush(iowa_mem_find_bus(addr)); \
56 return val; \
57}
58
59#define PCIEX_MMIO_READ_STR(name) \
60static void scc_pciex_##name(const PCI_IO_ADDR addr, void *buf, \
61 unsigned long count) \
62{ \
63 __do_##name(addr, buf, count); \
64 scc_pciex_io_flush(iowa_mem_find_bus(addr)); \
65}
66
67PCIEX_MMIO_READ(readb, u8)
68PCIEX_MMIO_READ(readw, u16)
69PCIEX_MMIO_READ(readl, u32)
70PCIEX_MMIO_READ(readq, u64)
71PCIEX_MMIO_READ(readw_be, u16)
72PCIEX_MMIO_READ(readl_be, u32)
73PCIEX_MMIO_READ(readq_be, u64)
74PCIEX_MMIO_READ_STR(readsb)
75PCIEX_MMIO_READ_STR(readsw)
76PCIEX_MMIO_READ_STR(readsl)
77
78static void scc_pciex_memcpy_fromio(void *dest, const PCI_IO_ADDR src,
79 unsigned long n)
80{
81 __do_memcpy_fromio(dest, src, n);
82 scc_pciex_io_flush(iowa_mem_find_bus(src));
83}
84
85/*
86 * I/O port access to devices on PCIEX.
87 */
88
89static inline unsigned long get_bus_address(struct pci_controller *phb,
90 unsigned long port)
91{
92 return port - ((unsigned long)(phb->io_base_virt) - _IO_BASE);
93}
94
95static u32 scc_pciex_read_port(struct pci_controller *phb,
96 unsigned long port, int size)
97{
98 unsigned int byte_enable;
99 unsigned int cmd, shift;
100 unsigned long addr;
101 u32 data, ret;
102
103 BUG_ON(((port & 0x3ul) + size) > 4);
104
105 addr = get_bus_address(phb, port);
106 shift = addr & 0x3ul;
107 byte_enable = ((1 << size) - 1) << shift;
108 cmd = PEXDCMND_IO_READ | (byte_enable << PEXDCMND_BYTE_EN_SHIFT);
109 PEX_OUT(phb->cfg_addr, PEXDADRS, (addr & ~0x3ul));
110 PEX_OUT(phb->cfg_addr, PEXDCMND, cmd);
111 data = PEX_IN(phb->cfg_addr, PEXDRDATA);
112 ret = (data >> (shift * 8)) & (0xFFFFFFFF >> ((4 - size) * 8));
113
114 pr_debug("PCIEX:PIO READ:port=0x%lx, addr=0x%lx, size=%d, be=%x,"
115 " cmd=%x, data=%x, ret=%x\n", port, addr, size, byte_enable,
116 cmd, data, ret);
117
118 return ret;
119}
120
121static void scc_pciex_write_port(struct pci_controller *phb,
122 unsigned long port, int size, u32 val)
123{
124 unsigned int byte_enable;
125 unsigned int cmd, shift;
126 unsigned long addr;
127 u32 data;
128
129 BUG_ON(((port & 0x3ul) + size) > 4);
130
131 addr = get_bus_address(phb, port);
132 shift = addr & 0x3ul;
133 byte_enable = ((1 << size) - 1) << shift;
134 cmd = PEXDCMND_IO_WRITE | (byte_enable << PEXDCMND_BYTE_EN_SHIFT);
135 data = (val & (0xFFFFFFFF >> (4 - size) * 8)) << (shift * 8);
136 PEX_OUT(phb->cfg_addr, PEXDADRS, (addr & ~0x3ul));
137 PEX_OUT(phb->cfg_addr, PEXDCMND, cmd);
138 PEX_OUT(phb->cfg_addr, PEXDWDATA, data);
139
140 pr_debug("PCIEX:PIO WRITE:port=0x%lx, addr=%lx, size=%d, val=%x,"
141 " be=%x, cmd=%x, data=%x\n", port, addr, size, val,
142 byte_enable, cmd, data);
143}
144
145static u8 __scc_pciex_inb(struct pci_controller *phb, unsigned long port)
146{
147 return (u8)scc_pciex_read_port(phb, port, 1);
148}
149
150static u16 __scc_pciex_inw(struct pci_controller *phb, unsigned long port)
151{
152 u32 data;
153 if ((port & 0x3ul) < 3)
154 data = scc_pciex_read_port(phb, port, 2);
155 else {
156 u32 d1 = scc_pciex_read_port(phb, port, 1);
157 u32 d2 = scc_pciex_read_port(phb, port + 1, 1);
158 data = d1 | (d2 << 8);
159 }
160 return (u16)data;
161}
162
163static u32 __scc_pciex_inl(struct pci_controller *phb, unsigned long port)
164{
165 unsigned int mod = port & 0x3ul;
166 u32 data;
167 if (mod == 0)
168 data = scc_pciex_read_port(phb, port, 4);
169 else {
170 u32 d1 = scc_pciex_read_port(phb, port, 4 - mod);
171 u32 d2 = scc_pciex_read_port(phb, port + 1, mod);
172 data = d1 | (d2 << (mod * 8));
173 }
174 return data;
175}
176
177static void __scc_pciex_outb(struct pci_controller *phb,
178 u8 val, unsigned long port)
179{
180 scc_pciex_write_port(phb, port, 1, (u32)val);
181}
182
183static void __scc_pciex_outw(struct pci_controller *phb,
184 u16 val, unsigned long port)
185{
186 if ((port & 0x3ul) < 3)
187 scc_pciex_write_port(phb, port, 2, (u32)val);
188 else {
189 u32 d1 = val & 0x000000FF;
190 u32 d2 = (val & 0x0000FF00) >> 8;
191 scc_pciex_write_port(phb, port, 1, d1);
192 scc_pciex_write_port(phb, port + 1, 1, d2);
193 }
194}
195
196static void __scc_pciex_outl(struct pci_controller *phb,
197 u32 val, unsigned long port)
198{
199 unsigned int mod = port & 0x3ul;
200 if (mod == 0)
201 scc_pciex_write_port(phb, port, 4, val);
202 else {
203 u32 d1 = val & (0xFFFFFFFFul >> (mod * 8));
204 u32 d2 = val >> ((4 - mod) * 8);
205 scc_pciex_write_port(phb, port, 4 - mod, d1);
206 scc_pciex_write_port(phb, port + 1, mod, d2);
207 }
208}
209
210#define PCIEX_PIO_FUNC(size, name) \
211static u##size scc_pciex_in##name(unsigned long port) \
212{ \
213 struct iowa_bus *bus = iowa_pio_find_bus(port); \
214 u##size data = __scc_pciex_in##name(bus->phb, port); \
215 scc_pciex_io_flush(bus); \
216 return data; \
217} \
218static void scc_pciex_ins##name(unsigned long p, void *b, unsigned long c) \
219{ \
220 struct iowa_bus *bus = iowa_pio_find_bus(p); \
221 __le##size *dst = b; \
222 for (; c != 0; c--, dst++) \
223 *dst = cpu_to_le##size(__scc_pciex_in##name(bus->phb, p)); \
224 scc_pciex_io_flush(bus); \
225} \
226static void scc_pciex_out##name(u##size val, unsigned long port) \
227{ \
228 struct iowa_bus *bus = iowa_pio_find_bus(port); \
229 __scc_pciex_out##name(bus->phb, val, port); \
230} \
231static void scc_pciex_outs##name(unsigned long p, const void *b, \
232 unsigned long c) \
233{ \
234 struct iowa_bus *bus = iowa_pio_find_bus(p); \
235 const __le##size *src = b; \
236 for (; c != 0; c--, src++) \
237 __scc_pciex_out##name(bus->phb, le##size##_to_cpu(*src), p); \
238}
239#define __le8 u8
240#define cpu_to_le8(x) (x)
241#define le8_to_cpu(x) (x)
242PCIEX_PIO_FUNC(8, b)
243PCIEX_PIO_FUNC(16, w)
244PCIEX_PIO_FUNC(32, l)
245
246static struct ppc_pci_io scc_pciex_ops = {
247 .readb = scc_pciex_readb,
248 .readw = scc_pciex_readw,
249 .readl = scc_pciex_readl,
250 .readq = scc_pciex_readq,
251 .readw_be = scc_pciex_readw_be,
252 .readl_be = scc_pciex_readl_be,
253 .readq_be = scc_pciex_readq_be,
254 .readsb = scc_pciex_readsb,
255 .readsw = scc_pciex_readsw,
256 .readsl = scc_pciex_readsl,
257 .memcpy_fromio = scc_pciex_memcpy_fromio,
258 .inb = scc_pciex_inb,
259 .inw = scc_pciex_inw,
260 .inl = scc_pciex_inl,
261 .outb = scc_pciex_outb,
262 .outw = scc_pciex_outw,
263 .outl = scc_pciex_outl,
264 .insb = scc_pciex_insb,
265 .insw = scc_pciex_insw,
266 .insl = scc_pciex_insl,
267 .outsb = scc_pciex_outsb,
268 .outsw = scc_pciex_outsw,
269 .outsl = scc_pciex_outsl,
270};
271
272static int __init scc_pciex_iowa_init(struct iowa_bus *bus, void *data)
273{
274 dma_addr_t dummy_page_da;
275 void *dummy_page_va;
276
277 dummy_page_va = kmalloc(PAGE_SIZE, GFP_KERNEL);
278 if (!dummy_page_va) {
279 pr_err("PCIEX:Alloc dummy_page_va failed\n");
280 return -1;
281 }
282
283 dummy_page_da = dma_map_single(bus->phb->parent, dummy_page_va,
284 PAGE_SIZE, DMA_FROM_DEVICE);
285 if (dma_mapping_error(bus->phb->parent, dummy_page_da)) {
286 pr_err("PCIEX:Map dummy page failed.\n");
287 kfree(dummy_page_va);
288 return -1;
289 }
290
291 PEX_OUT(bus->phb->cfg_addr, PEXDMRDADR0, dummy_page_da);
292
293 return 0;
294}
295
296/*
297 * config space access
298 */
299#define MK_PEXDADRS(bus_no, dev_no, func_no, addr) \
300 ((uint32_t)(((addr) & ~0x3UL) | \
301 ((bus_no) << PEXDADRS_BUSNO_SHIFT) | \
302 ((dev_no) << PEXDADRS_DEVNO_SHIFT) | \
303 ((func_no) << PEXDADRS_FUNCNO_SHIFT)))
304
305#define MK_PEXDCMND_BYTE_EN(addr, size) \
306 ((((0x1 << (size))-1) << ((addr) & 0x3)) << PEXDCMND_BYTE_EN_SHIFT)
307#define MK_PEXDCMND(cmd, addr, size) ((cmd) | MK_PEXDCMND_BYTE_EN(addr, size))
308
309static uint32_t config_read_pciex_dev(unsigned int __iomem *base,
310 uint64_t bus_no, uint64_t dev_no, uint64_t func_no,
311 uint64_t off, uint64_t size)
312{
313 uint32_t ret;
314 uint32_t addr, cmd;
315
316 addr = MK_PEXDADRS(bus_no, dev_no, func_no, off);
317 cmd = MK_PEXDCMND(PEXDCMND_CONFIG_READ, off, size);
318 PEX_OUT(base, PEXDADRS, addr);
319 PEX_OUT(base, PEXDCMND, cmd);
320 ret = (PEX_IN(base, PEXDRDATA)
321 >> ((off & (4-size)) * 8)) & ((0x1 << (size * 8)) - 1);
322 return ret;
323}
324
325static void config_write_pciex_dev(unsigned int __iomem *base, uint64_t bus_no,
326 uint64_t dev_no, uint64_t func_no, uint64_t off, uint64_t size,
327 uint32_t data)
328{
329 uint32_t addr, cmd;
330
331 addr = MK_PEXDADRS(bus_no, dev_no, func_no, off);
332 cmd = MK_PEXDCMND(PEXDCMND_CONFIG_WRITE, off, size);
333 PEX_OUT(base, PEXDADRS, addr);
334 PEX_OUT(base, PEXDCMND, cmd);
335 PEX_OUT(base, PEXDWDATA,
336 (data & ((0x1 << (size * 8)) - 1)) << ((off & (4-size)) * 8));
337}
338
339#define MK_PEXCADRS_BYTE_EN(off, len) \
340 ((((0x1 << (len)) - 1) << ((off) & 0x3)) << PEXCADRS_BYTE_EN_SHIFT)
341#define MK_PEXCADRS(cmd, addr, size) \
342 ((cmd) | MK_PEXCADRS_BYTE_EN(addr, size) | ((addr) & ~0x3))
343static uint32_t config_read_pciex_rc(unsigned int __iomem *base,
344 uint32_t where, uint32_t size)
345{
346 PEX_OUT(base, PEXCADRS, MK_PEXCADRS(PEXCADRS_CMD_READ, where, size));
347 return (PEX_IN(base, PEXCRDATA)
348 >> ((where & (4 - size)) * 8)) & ((0x1 << (size * 8)) - 1);
349}
350
351static void config_write_pciex_rc(unsigned int __iomem *base, uint32_t where,
352 uint32_t size, uint32_t val)
353{
354 uint32_t data;
355
356 data = (val & ((0x1 << (size * 8)) - 1)) << ((where & (4 - size)) * 8);
357 PEX_OUT(base, PEXCADRS, MK_PEXCADRS(PEXCADRS_CMD_WRITE, where, size));
358 PEX_OUT(base, PEXCWDATA, data);
359}
360
361/* Interfaces */
362/* Note: Work-around
363 * On SCC PCIEXC, one device is seen on all 32 dev_no.
364 * As SCC PCIEXC can have only one device on the bus, we look only one dev_no.
365 * (dev_no = 1)
366 */
367static int scc_pciex_read_config(struct pci_bus *bus, unsigned int devfn,
368 int where, int size, unsigned int *val)
369{
370 struct pci_controller *phb = pci_bus_to_host(bus);
371
372 if (bus->number == phb->first_busno && PCI_SLOT(devfn) != 1) {
373 *val = ~0;
374 return PCIBIOS_DEVICE_NOT_FOUND;
375 }
376
377 if (bus->number == 0 && PCI_SLOT(devfn) == 0)
378 *val = config_read_pciex_rc(phb->cfg_addr, where, size);
379 else
380 *val = config_read_pciex_dev(phb->cfg_addr, bus->number,
381 PCI_SLOT(devfn), PCI_FUNC(devfn), where, size);
382
383 return PCIBIOS_SUCCESSFUL;
384}
385
386static int scc_pciex_write_config(struct pci_bus *bus, unsigned int devfn,
387 int where, int size, unsigned int val)
388{
389 struct pci_controller *phb = pci_bus_to_host(bus);
390
391 if (bus->number == phb->first_busno && PCI_SLOT(devfn) != 1)
392 return PCIBIOS_DEVICE_NOT_FOUND;
393
394 if (bus->number == 0 && PCI_SLOT(devfn) == 0)
395 config_write_pciex_rc(phb->cfg_addr, where, size, val);
396 else
397 config_write_pciex_dev(phb->cfg_addr, bus->number,
398 PCI_SLOT(devfn), PCI_FUNC(devfn), where, size, val);
399 return PCIBIOS_SUCCESSFUL;
400}
401
402static struct pci_ops scc_pciex_pci_ops = {
403 scc_pciex_read_config,
404 scc_pciex_write_config,
405};
406
407static void pciex_clear_intr_all(unsigned int __iomem *base)
408{
409 PEX_OUT(base, PEXAERRSTS, 0xffffffff);
410 PEX_OUT(base, PEXPRERRSTS, 0xffffffff);
411 PEX_OUT(base, PEXINTSTS, 0xffffffff);
412}
413
414#if 0
415static void pciex_disable_intr_all(unsigned int *base)
416{
417 PEX_OUT(base, PEXINTMASK, 0x0);
418 PEX_OUT(base, PEXAERRMASK, 0x0);
419 PEX_OUT(base, PEXPRERRMASK, 0x0);
420 PEX_OUT(base, PEXVDMASK, 0x0);
421}
422#endif
423
424static void pciex_enable_intr_all(unsigned int __iomem *base)
425{
426 PEX_OUT(base, PEXINTMASK, 0x0000e7f1);
427 PEX_OUT(base, PEXAERRMASK, 0x03ff01ff);
428 PEX_OUT(base, PEXPRERRMASK, 0x0001010f);
429 PEX_OUT(base, PEXVDMASK, 0x00000001);
430}
431
432static void pciex_check_status(unsigned int __iomem *base)
433{
434 uint32_t err = 0;
435 uint32_t intsts, aerr, prerr, rcvcp, lenerr;
436 uint32_t maea, maec;
437
438 intsts = PEX_IN(base, PEXINTSTS);
439 aerr = PEX_IN(base, PEXAERRSTS);
440 prerr = PEX_IN(base, PEXPRERRSTS);
441 rcvcp = PEX_IN(base, PEXRCVCPLIDA);
442 lenerr = PEX_IN(base, PEXLENERRIDA);
443
444 if (intsts || aerr || prerr || rcvcp || lenerr)
445 err = 1;
446
447 pr_info("PCEXC interrupt!!\n");
448 pr_info("PEXINTSTS :0x%08x\n", intsts);
449 pr_info("PEXAERRSTS :0x%08x\n", aerr);
450 pr_info("PEXPRERRSTS :0x%08x\n", prerr);
451 pr_info("PEXRCVCPLIDA :0x%08x\n", rcvcp);
452 pr_info("PEXLENERRIDA :0x%08x\n", lenerr);
453
454 /* print detail of Protection Error */
455 if (intsts & 0x00004000) {
456 uint32_t i, n;
457 for (i = 0; i < 4; i++) {
458 n = 1 << i;
459 if (prerr & n) {
460 maea = PEX_IN(base, PEXMAEA(i));
461 maec = PEX_IN(base, PEXMAEC(i));
462 pr_info("PEXMAEC%d :0x%08x\n", i, maec);
463 pr_info("PEXMAEA%d :0x%08x\n", i, maea);
464 }
465 }
466 }
467
468 if (err)
469 pciex_clear_intr_all(base);
470}
471
472static irqreturn_t pciex_handle_internal_irq(int irq, void *dev_id)
473{
474 struct pci_controller *phb = dev_id;
475
476 pr_debug("PCIEX:pciex_handle_internal_irq(irq=%d)\n", irq);
477
478 BUG_ON(phb->cfg_addr == NULL);
479
480 pciex_check_status(phb->cfg_addr);
481
482 return IRQ_HANDLED;
483}
484
485static __init int celleb_setup_pciex(struct device_node *node,
486 struct pci_controller *phb)
487{
488 struct resource r;
489 struct of_irq oirq;
490 int virq;
491
492 /* SMMIO registers; used inside this file */
493 if (of_address_to_resource(node, 0, &r)) {
494 pr_err("PCIEXC:Failed to get config resource.\n");
495 return 1;
496 }
497 phb->cfg_addr = ioremap(r.start, r.end - r.start + 1);
498 if (!phb->cfg_addr) {
499 pr_err("PCIEXC:Failed to remap SMMIO region.\n");
500 return 1;
501 }
502
503 /* Not use cfg_data, cmd and data regs are near address reg */
504 phb->cfg_data = NULL;
505
506 /* set pci_ops */
507 phb->ops = &scc_pciex_pci_ops;
508
509 /* internal interrupt handler */
510 if (of_irq_map_one(node, 1, &oirq)) {
511 pr_err("PCIEXC:Failed to map irq\n");
512 goto error;
513 }
514 virq = irq_create_of_mapping(oirq.controller, oirq.specifier,
515 oirq.size);
516 if (request_irq(virq, pciex_handle_internal_irq,
517 IRQF_DISABLED, "pciex", (void *)phb)) {
518 pr_err("PCIEXC:Failed to request irq\n");
519 goto error;
520 }
521
522 /* enable all interrupts */
523 pciex_clear_intr_all(phb->cfg_addr);
524 pciex_enable_intr_all(phb->cfg_addr);
525 /* MSI: TBD */
526
527 return 0;
528
529error:
530 phb->cfg_data = NULL;
531 if (phb->cfg_addr)
532 iounmap(phb->cfg_addr);
533 phb->cfg_addr = NULL;
534 return 1;
535}
536
537struct celleb_phb_spec celleb_pciex_spec __initdata = {
538 .setup = celleb_setup_pciex,
539 .ops = &scc_pciex_ops,
540 .iowa_init = &scc_pciex_iowa_init,
541};