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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Support for V3 Semiconductor PCI Local Bus to PCI Bridge
4 * Copyright (C) 2017 Linus Walleij <linus.walleij@linaro.org>
5 *
6 * Based on the code from arch/arm/mach-integrator/pci_v3.c
7 * Copyright (C) 1999 ARM Limited
8 * Copyright (C) 2000-2001 Deep Blue Solutions Ltd
9 *
10 * Contributors to the old driver include:
11 * Russell King <linux@armlinux.org.uk>
12 * David A. Rusling <david.rusling@linaro.org> (uHAL, ARM Firmware suite)
13 * Rob Herring <robh@kernel.org>
14 * Liviu Dudau <Liviu.Dudau@arm.com>
15 * Grant Likely <grant.likely@secretlab.ca>
16 * Arnd Bergmann <arnd@arndb.de>
17 * Bjorn Helgaas <bhelgaas@google.com>
18 */
19#include <linux/init.h>
20#include <linux/interrupt.h>
21#include <linux/io.h>
22#include <linux/kernel.h>
23#include <linux/of_address.h>
24#include <linux/of_device.h>
25#include <linux/of_pci.h>
26#include <linux/pci.h>
27#include <linux/platform_device.h>
28#include <linux/slab.h>
29#include <linux/bitops.h>
30#include <linux/irq.h>
31#include <linux/mfd/syscon.h>
32#include <linux/regmap.h>
33#include <linux/clk.h>
34
35#include "../pci.h"
36
37#define V3_PCI_VENDOR 0x00000000
38#define V3_PCI_DEVICE 0x00000002
39#define V3_PCI_CMD 0x00000004
40#define V3_PCI_STAT 0x00000006
41#define V3_PCI_CC_REV 0x00000008
42#define V3_PCI_HDR_CFG 0x0000000C
43#define V3_PCI_IO_BASE 0x00000010
44#define V3_PCI_BASE0 0x00000014
45#define V3_PCI_BASE1 0x00000018
46#define V3_PCI_SUB_VENDOR 0x0000002C
47#define V3_PCI_SUB_ID 0x0000002E
48#define V3_PCI_ROM 0x00000030
49#define V3_PCI_BPARAM 0x0000003C
50#define V3_PCI_MAP0 0x00000040
51#define V3_PCI_MAP1 0x00000044
52#define V3_PCI_INT_STAT 0x00000048
53#define V3_PCI_INT_CFG 0x0000004C
54#define V3_LB_BASE0 0x00000054
55#define V3_LB_BASE1 0x00000058
56#define V3_LB_MAP0 0x0000005E
57#define V3_LB_MAP1 0x00000062
58#define V3_LB_BASE2 0x00000064
59#define V3_LB_MAP2 0x00000066
60#define V3_LB_SIZE 0x00000068
61#define V3_LB_IO_BASE 0x0000006E
62#define V3_FIFO_CFG 0x00000070
63#define V3_FIFO_PRIORITY 0x00000072
64#define V3_FIFO_STAT 0x00000074
65#define V3_LB_ISTAT 0x00000076
66#define V3_LB_IMASK 0x00000077
67#define V3_SYSTEM 0x00000078
68#define V3_LB_CFG 0x0000007A
69#define V3_PCI_CFG 0x0000007C
70#define V3_DMA_PCI_ADR0 0x00000080
71#define V3_DMA_PCI_ADR1 0x00000090
72#define V3_DMA_LOCAL_ADR0 0x00000084
73#define V3_DMA_LOCAL_ADR1 0x00000094
74#define V3_DMA_LENGTH0 0x00000088
75#define V3_DMA_LENGTH1 0x00000098
76#define V3_DMA_CSR0 0x0000008B
77#define V3_DMA_CSR1 0x0000009B
78#define V3_DMA_CTLB_ADR0 0x0000008C
79#define V3_DMA_CTLB_ADR1 0x0000009C
80#define V3_DMA_DELAY 0x000000E0
81#define V3_MAIL_DATA 0x000000C0
82#define V3_PCI_MAIL_IEWR 0x000000D0
83#define V3_PCI_MAIL_IERD 0x000000D2
84#define V3_LB_MAIL_IEWR 0x000000D4
85#define V3_LB_MAIL_IERD 0x000000D6
86#define V3_MAIL_WR_STAT 0x000000D8
87#define V3_MAIL_RD_STAT 0x000000DA
88#define V3_QBA_MAP 0x000000DC
89
90/* PCI STATUS bits */
91#define V3_PCI_STAT_PAR_ERR BIT(15)
92#define V3_PCI_STAT_SYS_ERR BIT(14)
93#define V3_PCI_STAT_M_ABORT_ERR BIT(13)
94#define V3_PCI_STAT_T_ABORT_ERR BIT(12)
95
96/* LB ISTAT bits */
97#define V3_LB_ISTAT_MAILBOX BIT(7)
98#define V3_LB_ISTAT_PCI_RD BIT(6)
99#define V3_LB_ISTAT_PCI_WR BIT(5)
100#define V3_LB_ISTAT_PCI_INT BIT(4)
101#define V3_LB_ISTAT_PCI_PERR BIT(3)
102#define V3_LB_ISTAT_I2O_QWR BIT(2)
103#define V3_LB_ISTAT_DMA1 BIT(1)
104#define V3_LB_ISTAT_DMA0 BIT(0)
105
106/* PCI COMMAND bits */
107#define V3_COMMAND_M_FBB_EN BIT(9)
108#define V3_COMMAND_M_SERR_EN BIT(8)
109#define V3_COMMAND_M_PAR_EN BIT(6)
110#define V3_COMMAND_M_MASTER_EN BIT(2)
111#define V3_COMMAND_M_MEM_EN BIT(1)
112#define V3_COMMAND_M_IO_EN BIT(0)
113
114/* SYSTEM bits */
115#define V3_SYSTEM_M_RST_OUT BIT(15)
116#define V3_SYSTEM_M_LOCK BIT(14)
117#define V3_SYSTEM_UNLOCK 0xa05f
118
119/* PCI CFG bits */
120#define V3_PCI_CFG_M_I2O_EN BIT(15)
121#define V3_PCI_CFG_M_IO_REG_DIS BIT(14)
122#define V3_PCI_CFG_M_IO_DIS BIT(13)
123#define V3_PCI_CFG_M_EN3V BIT(12)
124#define V3_PCI_CFG_M_RETRY_EN BIT(10)
125#define V3_PCI_CFG_M_AD_LOW1 BIT(9)
126#define V3_PCI_CFG_M_AD_LOW0 BIT(8)
127/*
128 * This is the value applied to C/BE[3:1], with bit 0 always held 0
129 * during DMA access.
130 */
131#define V3_PCI_CFG_M_RTYPE_SHIFT 5
132#define V3_PCI_CFG_M_WTYPE_SHIFT 1
133#define V3_PCI_CFG_TYPE_DEFAULT 0x3
134
135/* PCI BASE bits (PCI -> Local Bus) */
136#define V3_PCI_BASE_M_ADR_BASE 0xFFF00000U
137#define V3_PCI_BASE_M_ADR_BASEL 0x000FFF00U
138#define V3_PCI_BASE_M_PREFETCH BIT(3)
139#define V3_PCI_BASE_M_TYPE (3 << 1)
140#define V3_PCI_BASE_M_IO BIT(0)
141
142/* PCI MAP bits (PCI -> Local bus) */
143#define V3_PCI_MAP_M_MAP_ADR 0xFFF00000U
144#define V3_PCI_MAP_M_RD_POST_INH BIT(15)
145#define V3_PCI_MAP_M_ROM_SIZE (3 << 10)
146#define V3_PCI_MAP_M_SWAP (3 << 8)
147#define V3_PCI_MAP_M_ADR_SIZE 0x000000F0U
148#define V3_PCI_MAP_M_REG_EN BIT(1)
149#define V3_PCI_MAP_M_ENABLE BIT(0)
150
151/* LB_BASE0,1 bits (Local bus -> PCI) */
152#define V3_LB_BASE_ADR_BASE 0xfff00000U
153#define V3_LB_BASE_SWAP (3 << 8)
154#define V3_LB_BASE_ADR_SIZE (15 << 4)
155#define V3_LB_BASE_PREFETCH BIT(3)
156#define V3_LB_BASE_ENABLE BIT(0)
157
158#define V3_LB_BASE_ADR_SIZE_1MB (0 << 4)
159#define V3_LB_BASE_ADR_SIZE_2MB (1 << 4)
160#define V3_LB_BASE_ADR_SIZE_4MB (2 << 4)
161#define V3_LB_BASE_ADR_SIZE_8MB (3 << 4)
162#define V3_LB_BASE_ADR_SIZE_16MB (4 << 4)
163#define V3_LB_BASE_ADR_SIZE_32MB (5 << 4)
164#define V3_LB_BASE_ADR_SIZE_64MB (6 << 4)
165#define V3_LB_BASE_ADR_SIZE_128MB (7 << 4)
166#define V3_LB_BASE_ADR_SIZE_256MB (8 << 4)
167#define V3_LB_BASE_ADR_SIZE_512MB (9 << 4)
168#define V3_LB_BASE_ADR_SIZE_1GB (10 << 4)
169#define V3_LB_BASE_ADR_SIZE_2GB (11 << 4)
170
171#define v3_addr_to_lb_base(a) ((a) & V3_LB_BASE_ADR_BASE)
172
173/* LB_MAP0,1 bits (Local bus -> PCI) */
174#define V3_LB_MAP_MAP_ADR 0xfff0U
175#define V3_LB_MAP_TYPE (7 << 1)
176#define V3_LB_MAP_AD_LOW_EN BIT(0)
177
178#define V3_LB_MAP_TYPE_IACK (0 << 1)
179#define V3_LB_MAP_TYPE_IO (1 << 1)
180#define V3_LB_MAP_TYPE_MEM (3 << 1)
181#define V3_LB_MAP_TYPE_CONFIG (5 << 1)
182#define V3_LB_MAP_TYPE_MEM_MULTIPLE (6 << 1)
183
184#define v3_addr_to_lb_map(a) (((a) >> 16) & V3_LB_MAP_MAP_ADR)
185
186/* LB_BASE2 bits (Local bus -> PCI IO) */
187#define V3_LB_BASE2_ADR_BASE 0xff00U
188#define V3_LB_BASE2_SWAP_AUTO (3 << 6)
189#define V3_LB_BASE2_ENABLE BIT(0)
190
191#define v3_addr_to_lb_base2(a) (((a) >> 16) & V3_LB_BASE2_ADR_BASE)
192
193/* LB_MAP2 bits (Local bus -> PCI IO) */
194#define V3_LB_MAP2_MAP_ADR 0xff00U
195
196#define v3_addr_to_lb_map2(a) (((a) >> 16) & V3_LB_MAP2_MAP_ADR)
197
198/* FIFO priority bits */
199#define V3_FIFO_PRIO_LOCAL BIT(12)
200#define V3_FIFO_PRIO_LB_RD1_FLUSH_EOB BIT(10)
201#define V3_FIFO_PRIO_LB_RD1_FLUSH_AP1 BIT(11)
202#define V3_FIFO_PRIO_LB_RD1_FLUSH_ANY (BIT(10)|BIT(11))
203#define V3_FIFO_PRIO_LB_RD0_FLUSH_EOB BIT(8)
204#define V3_FIFO_PRIO_LB_RD0_FLUSH_AP1 BIT(9)
205#define V3_FIFO_PRIO_LB_RD0_FLUSH_ANY (BIT(8)|BIT(9))
206#define V3_FIFO_PRIO_PCI BIT(4)
207#define V3_FIFO_PRIO_PCI_RD1_FLUSH_EOB BIT(2)
208#define V3_FIFO_PRIO_PCI_RD1_FLUSH_AP1 BIT(3)
209#define V3_FIFO_PRIO_PCI_RD1_FLUSH_ANY (BIT(2)|BIT(3))
210#define V3_FIFO_PRIO_PCI_RD0_FLUSH_EOB BIT(0)
211#define V3_FIFO_PRIO_PCI_RD0_FLUSH_AP1 BIT(1)
212#define V3_FIFO_PRIO_PCI_RD0_FLUSH_ANY (BIT(0)|BIT(1))
213
214/* Local bus configuration bits */
215#define V3_LB_CFG_LB_TO_64_CYCLES 0x0000
216#define V3_LB_CFG_LB_TO_256_CYCLES BIT(13)
217#define V3_LB_CFG_LB_TO_512_CYCLES BIT(14)
218#define V3_LB_CFG_LB_TO_1024_CYCLES (BIT(13)|BIT(14))
219#define V3_LB_CFG_LB_RST BIT(12)
220#define V3_LB_CFG_LB_PPC_RDY BIT(11)
221#define V3_LB_CFG_LB_LB_INT BIT(10)
222#define V3_LB_CFG_LB_ERR_EN BIT(9)
223#define V3_LB_CFG_LB_RDY_EN BIT(8)
224#define V3_LB_CFG_LB_BE_IMODE BIT(7)
225#define V3_LB_CFG_LB_BE_OMODE BIT(6)
226#define V3_LB_CFG_LB_ENDIAN BIT(5)
227#define V3_LB_CFG_LB_PARK_EN BIT(4)
228#define V3_LB_CFG_LB_FBB_DIS BIT(2)
229
230/* ARM Integrator-specific extended control registers */
231#define INTEGRATOR_SC_PCI_OFFSET 0x18
232#define INTEGRATOR_SC_PCI_ENABLE BIT(0)
233#define INTEGRATOR_SC_PCI_INTCLR BIT(1)
234#define INTEGRATOR_SC_LBFADDR_OFFSET 0x20
235#define INTEGRATOR_SC_LBFCODE_OFFSET 0x24
236
237struct v3_pci {
238 struct device *dev;
239 void __iomem *base;
240 void __iomem *config_base;
241 u32 config_mem;
242 u32 non_pre_mem;
243 u32 pre_mem;
244 phys_addr_t non_pre_bus_addr;
245 phys_addr_t pre_bus_addr;
246 struct regmap *map;
247};
248
249/*
250 * The V3 PCI interface chip in Integrator provides several windows from
251 * local bus memory into the PCI memory areas. Unfortunately, there
252 * are not really enough windows for our usage, therefore we reuse
253 * one of the windows for access to PCI configuration space. On the
254 * Integrator/AP, the memory map is as follows:
255 *
256 * Local Bus Memory Usage
257 *
258 * 40000000 - 4FFFFFFF PCI memory. 256M non-prefetchable
259 * 50000000 - 5FFFFFFF PCI memory. 256M prefetchable
260 * 60000000 - 60FFFFFF PCI IO. 16M
261 * 61000000 - 61FFFFFF PCI Configuration. 16M
262 *
263 * There are three V3 windows, each described by a pair of V3 registers.
264 * These are LB_BASE0/LB_MAP0, LB_BASE1/LB_MAP1 and LB_BASE2/LB_MAP2.
265 * Base0 and Base1 can be used for any type of PCI memory access. Base2
266 * can be used either for PCI I/O or for I20 accesses. By default, uHAL
267 * uses this only for PCI IO space.
268 *
269 * Normally these spaces are mapped using the following base registers:
270 *
271 * Usage Local Bus Memory Base/Map registers used
272 *
273 * Mem 40000000 - 4FFFFFFF LB_BASE0/LB_MAP0
274 * Mem 50000000 - 5FFFFFFF LB_BASE1/LB_MAP1
275 * IO 60000000 - 60FFFFFF LB_BASE2/LB_MAP2
276 * Cfg 61000000 - 61FFFFFF
277 *
278 * This means that I20 and PCI configuration space accesses will fail.
279 * When PCI configuration accesses are needed (via the uHAL PCI
280 * configuration space primitives) we must remap the spaces as follows:
281 *
282 * Usage Local Bus Memory Base/Map registers used
283 *
284 * Mem 40000000 - 4FFFFFFF LB_BASE0/LB_MAP0
285 * Mem 50000000 - 5FFFFFFF LB_BASE0/LB_MAP0
286 * IO 60000000 - 60FFFFFF LB_BASE2/LB_MAP2
287 * Cfg 61000000 - 61FFFFFF LB_BASE1/LB_MAP1
288 *
289 * To make this work, the code depends on overlapping windows working.
290 * The V3 chip translates an address by checking its range within
291 * each of the BASE/MAP pairs in turn (in ascending register number
292 * order). It will use the first matching pair. So, for example,
293 * if the same address is mapped by both LB_BASE0/LB_MAP0 and
294 * LB_BASE1/LB_MAP1, the V3 will use the translation from
295 * LB_BASE0/LB_MAP0.
296 *
297 * To allow PCI Configuration space access, the code enlarges the
298 * window mapped by LB_BASE0/LB_MAP0 from 256M to 512M. This occludes
299 * the windows currently mapped by LB_BASE1/LB_MAP1 so that it can
300 * be remapped for use by configuration cycles.
301 *
302 * At the end of the PCI Configuration space accesses,
303 * LB_BASE1/LB_MAP1 is reset to map PCI Memory. Finally the window
304 * mapped by LB_BASE0/LB_MAP0 is reduced in size from 512M to 256M to
305 * reveal the now restored LB_BASE1/LB_MAP1 window.
306 *
307 * NOTE: We do not set up I2O mapping. I suspect that this is only
308 * for an intelligent (target) device. Using I2O disables most of
309 * the mappings into PCI memory.
310 */
311static void __iomem *v3_map_bus(struct pci_bus *bus,
312 unsigned int devfn, int offset)
313{
314 struct v3_pci *v3 = bus->sysdata;
315 unsigned int address, mapaddress, busnr;
316
317 busnr = bus->number;
318 if (busnr == 0) {
319 int slot = PCI_SLOT(devfn);
320
321 /*
322 * local bus segment so need a type 0 config cycle
323 *
324 * build the PCI configuration "address" with one-hot in
325 * A31-A11
326 *
327 * mapaddress:
328 * 3:1 = config cycle (101)
329 * 0 = PCI A1 & A0 are 0 (0)
330 */
331 address = PCI_FUNC(devfn) << 8;
332 mapaddress = V3_LB_MAP_TYPE_CONFIG;
333
334 if (slot > 12)
335 /*
336 * high order bits are handled by the MAP register
337 */
338 mapaddress |= BIT(slot - 5);
339 else
340 /*
341 * low order bits handled directly in the address
342 */
343 address |= BIT(slot + 11);
344 } else {
345 /*
346 * not the local bus segment so need a type 1 config cycle
347 *
348 * address:
349 * 23:16 = bus number
350 * 15:11 = slot number (7:3 of devfn)
351 * 10:8 = func number (2:0 of devfn)
352 *
353 * mapaddress:
354 * 3:1 = config cycle (101)
355 * 0 = PCI A1 & A0 from host bus (1)
356 */
357 mapaddress = V3_LB_MAP_TYPE_CONFIG | V3_LB_MAP_AD_LOW_EN;
358 address = (busnr << 16) | (devfn << 8);
359 }
360
361 /*
362 * Set up base0 to see all 512Mbytes of memory space (not
363 * prefetchable), this frees up base1 for re-use by
364 * configuration memory
365 */
366 writel(v3_addr_to_lb_base(v3->non_pre_mem) |
367 V3_LB_BASE_ADR_SIZE_512MB | V3_LB_BASE_ENABLE,
368 v3->base + V3_LB_BASE0);
369
370 /*
371 * Set up base1/map1 to point into configuration space.
372 * The config mem is always 16MB.
373 */
374 writel(v3_addr_to_lb_base(v3->config_mem) |
375 V3_LB_BASE_ADR_SIZE_16MB | V3_LB_BASE_ENABLE,
376 v3->base + V3_LB_BASE1);
377 writew(mapaddress, v3->base + V3_LB_MAP1);
378
379 return v3->config_base + address + offset;
380}
381
382static void v3_unmap_bus(struct v3_pci *v3)
383{
384 /*
385 * Reassign base1 for use by prefetchable PCI memory
386 */
387 writel(v3_addr_to_lb_base(v3->pre_mem) |
388 V3_LB_BASE_ADR_SIZE_256MB | V3_LB_BASE_PREFETCH |
389 V3_LB_BASE_ENABLE,
390 v3->base + V3_LB_BASE1);
391 writew(v3_addr_to_lb_map(v3->pre_bus_addr) |
392 V3_LB_MAP_TYPE_MEM, /* was V3_LB_MAP_TYPE_MEM_MULTIPLE */
393 v3->base + V3_LB_MAP1);
394
395 /*
396 * And shrink base0 back to a 256M window (NOTE: MAP0 already correct)
397 */
398 writel(v3_addr_to_lb_base(v3->non_pre_mem) |
399 V3_LB_BASE_ADR_SIZE_256MB | V3_LB_BASE_ENABLE,
400 v3->base + V3_LB_BASE0);
401}
402
403static int v3_pci_read_config(struct pci_bus *bus, unsigned int fn,
404 int config, int size, u32 *value)
405{
406 struct v3_pci *v3 = bus->sysdata;
407 int ret;
408
409 dev_dbg(&bus->dev,
410 "[read] slt: %.2d, fnc: %d, cnf: 0x%.2X, val (%d bytes): 0x%.8X\n",
411 PCI_SLOT(fn), PCI_FUNC(fn), config, size, *value);
412 ret = pci_generic_config_read(bus, fn, config, size, value);
413 v3_unmap_bus(v3);
414 return ret;
415}
416
417static int v3_pci_write_config(struct pci_bus *bus, unsigned int fn,
418 int config, int size, u32 value)
419{
420 struct v3_pci *v3 = bus->sysdata;
421 int ret;
422
423 dev_dbg(&bus->dev,
424 "[write] slt: %.2d, fnc: %d, cnf: 0x%.2X, val (%d bytes): 0x%.8X\n",
425 PCI_SLOT(fn), PCI_FUNC(fn), config, size, value);
426 ret = pci_generic_config_write(bus, fn, config, size, value);
427 v3_unmap_bus(v3);
428 return ret;
429}
430
431static struct pci_ops v3_pci_ops = {
432 .map_bus = v3_map_bus,
433 .read = v3_pci_read_config,
434 .write = v3_pci_write_config,
435};
436
437static irqreturn_t v3_irq(int irq, void *data)
438{
439 struct v3_pci *v3 = data;
440 struct device *dev = v3->dev;
441 u32 status;
442
443 status = readw(v3->base + V3_PCI_STAT);
444 if (status & V3_PCI_STAT_PAR_ERR)
445 dev_err(dev, "parity error interrupt\n");
446 if (status & V3_PCI_STAT_SYS_ERR)
447 dev_err(dev, "system error interrupt\n");
448 if (status & V3_PCI_STAT_M_ABORT_ERR)
449 dev_err(dev, "master abort error interrupt\n");
450 if (status & V3_PCI_STAT_T_ABORT_ERR)
451 dev_err(dev, "target abort error interrupt\n");
452 writew(status, v3->base + V3_PCI_STAT);
453
454 status = readb(v3->base + V3_LB_ISTAT);
455 if (status & V3_LB_ISTAT_MAILBOX)
456 dev_info(dev, "PCI mailbox interrupt\n");
457 if (status & V3_LB_ISTAT_PCI_RD)
458 dev_err(dev, "PCI target LB->PCI READ abort interrupt\n");
459 if (status & V3_LB_ISTAT_PCI_WR)
460 dev_err(dev, "PCI target LB->PCI WRITE abort interrupt\n");
461 if (status & V3_LB_ISTAT_PCI_INT)
462 dev_info(dev, "PCI pin interrupt\n");
463 if (status & V3_LB_ISTAT_PCI_PERR)
464 dev_err(dev, "PCI parity error interrupt\n");
465 if (status & V3_LB_ISTAT_I2O_QWR)
466 dev_info(dev, "I2O inbound post queue interrupt\n");
467 if (status & V3_LB_ISTAT_DMA1)
468 dev_info(dev, "DMA channel 1 interrupt\n");
469 if (status & V3_LB_ISTAT_DMA0)
470 dev_info(dev, "DMA channel 0 interrupt\n");
471 /* Clear all possible interrupts on the local bus */
472 writeb(0, v3->base + V3_LB_ISTAT);
473 if (v3->map)
474 regmap_write(v3->map, INTEGRATOR_SC_PCI_OFFSET,
475 INTEGRATOR_SC_PCI_ENABLE |
476 INTEGRATOR_SC_PCI_INTCLR);
477
478 return IRQ_HANDLED;
479}
480
481static int v3_integrator_init(struct v3_pci *v3)
482{
483 unsigned int val;
484
485 v3->map =
486 syscon_regmap_lookup_by_compatible("arm,integrator-ap-syscon");
487 if (IS_ERR(v3->map)) {
488 dev_err(v3->dev, "no syscon\n");
489 return -ENODEV;
490 }
491
492 regmap_read(v3->map, INTEGRATOR_SC_PCI_OFFSET, &val);
493 /* Take the PCI bridge out of reset, clear IRQs */
494 regmap_write(v3->map, INTEGRATOR_SC_PCI_OFFSET,
495 INTEGRATOR_SC_PCI_ENABLE |
496 INTEGRATOR_SC_PCI_INTCLR);
497
498 if (!(val & INTEGRATOR_SC_PCI_ENABLE)) {
499 /* If we were in reset we need to sleep a bit */
500 msleep(230);
501
502 /* Set the physical base for the controller itself */
503 writel(0x6200, v3->base + V3_LB_IO_BASE);
504
505 /* Wait for the mailbox to settle after reset */
506 do {
507 writeb(0xaa, v3->base + V3_MAIL_DATA);
508 writeb(0x55, v3->base + V3_MAIL_DATA + 4);
509 } while (readb(v3->base + V3_MAIL_DATA) != 0xaa &&
510 readb(v3->base + V3_MAIL_DATA) != 0x55);
511 }
512
513 dev_info(v3->dev, "initialized PCI V3 Integrator/AP integration\n");
514
515 return 0;
516}
517
518static int v3_pci_setup_resource(struct v3_pci *v3,
519 struct pci_host_bridge *host,
520 struct resource_entry *win)
521{
522 struct device *dev = v3->dev;
523 struct resource *mem;
524 struct resource *io;
525
526 switch (resource_type(win->res)) {
527 case IORESOURCE_IO:
528 io = win->res;
529
530 /* Setup window 2 - PCI I/O */
531 writel(v3_addr_to_lb_base2(pci_pio_to_address(io->start)) |
532 V3_LB_BASE2_ENABLE,
533 v3->base + V3_LB_BASE2);
534 writew(v3_addr_to_lb_map2(io->start - win->offset),
535 v3->base + V3_LB_MAP2);
536 break;
537 case IORESOURCE_MEM:
538 mem = win->res;
539 if (mem->flags & IORESOURCE_PREFETCH) {
540 mem->name = "V3 PCI PRE-MEM";
541 v3->pre_mem = mem->start;
542 v3->pre_bus_addr = mem->start - win->offset;
543 dev_dbg(dev, "PREFETCHABLE MEM window %pR, bus addr %pap\n",
544 mem, &v3->pre_bus_addr);
545 if (resource_size(mem) != SZ_256M) {
546 dev_err(dev, "prefetchable memory range is not 256MB\n");
547 return -EINVAL;
548 }
549 if (v3->non_pre_mem &&
550 (mem->start != v3->non_pre_mem + SZ_256M)) {
551 dev_err(dev,
552 "prefetchable memory is not adjacent to non-prefetchable memory\n");
553 return -EINVAL;
554 }
555 /* Setup window 1 - PCI prefetchable memory */
556 writel(v3_addr_to_lb_base(v3->pre_mem) |
557 V3_LB_BASE_ADR_SIZE_256MB |
558 V3_LB_BASE_PREFETCH |
559 V3_LB_BASE_ENABLE,
560 v3->base + V3_LB_BASE1);
561 writew(v3_addr_to_lb_map(v3->pre_bus_addr) |
562 V3_LB_MAP_TYPE_MEM, /* Was V3_LB_MAP_TYPE_MEM_MULTIPLE */
563 v3->base + V3_LB_MAP1);
564 } else {
565 mem->name = "V3 PCI NON-PRE-MEM";
566 v3->non_pre_mem = mem->start;
567 v3->non_pre_bus_addr = mem->start - win->offset;
568 dev_dbg(dev, "NON-PREFETCHABLE MEM window %pR, bus addr %pap\n",
569 mem, &v3->non_pre_bus_addr);
570 if (resource_size(mem) != SZ_256M) {
571 dev_err(dev,
572 "non-prefetchable memory range is not 256MB\n");
573 return -EINVAL;
574 }
575 /* Setup window 0 - PCI non-prefetchable memory */
576 writel(v3_addr_to_lb_base(v3->non_pre_mem) |
577 V3_LB_BASE_ADR_SIZE_256MB |
578 V3_LB_BASE_ENABLE,
579 v3->base + V3_LB_BASE0);
580 writew(v3_addr_to_lb_map(v3->non_pre_bus_addr) |
581 V3_LB_MAP_TYPE_MEM,
582 v3->base + V3_LB_MAP0);
583 }
584 break;
585 case IORESOURCE_BUS:
586 break;
587 default:
588 dev_info(dev, "Unknown resource type %lu\n",
589 resource_type(win->res));
590 break;
591 }
592
593 return 0;
594}
595
596static int v3_get_dma_range_config(struct v3_pci *v3,
597 struct resource_entry *entry,
598 u32 *pci_base, u32 *pci_map)
599{
600 struct device *dev = v3->dev;
601 u64 cpu_addr = entry->res->start;
602 u64 cpu_end = entry->res->end;
603 u64 pci_end = cpu_end - entry->offset;
604 u64 pci_addr = entry->res->start - entry->offset;
605 u32 val;
606
607 if (pci_addr & ~V3_PCI_BASE_M_ADR_BASE) {
608 dev_err(dev, "illegal range, only PCI bits 31..20 allowed\n");
609 return -EINVAL;
610 }
611 val = ((u32)pci_addr) & V3_PCI_BASE_M_ADR_BASE;
612 *pci_base = val;
613
614 if (cpu_addr & ~V3_PCI_MAP_M_MAP_ADR) {
615 dev_err(dev, "illegal range, only CPU bits 31..20 allowed\n");
616 return -EINVAL;
617 }
618 val = ((u32)cpu_addr) & V3_PCI_MAP_M_MAP_ADR;
619
620 switch (resource_size(entry->res)) {
621 case SZ_1M:
622 val |= V3_LB_BASE_ADR_SIZE_1MB;
623 break;
624 case SZ_2M:
625 val |= V3_LB_BASE_ADR_SIZE_2MB;
626 break;
627 case SZ_4M:
628 val |= V3_LB_BASE_ADR_SIZE_4MB;
629 break;
630 case SZ_8M:
631 val |= V3_LB_BASE_ADR_SIZE_8MB;
632 break;
633 case SZ_16M:
634 val |= V3_LB_BASE_ADR_SIZE_16MB;
635 break;
636 case SZ_32M:
637 val |= V3_LB_BASE_ADR_SIZE_32MB;
638 break;
639 case SZ_64M:
640 val |= V3_LB_BASE_ADR_SIZE_64MB;
641 break;
642 case SZ_128M:
643 val |= V3_LB_BASE_ADR_SIZE_128MB;
644 break;
645 case SZ_256M:
646 val |= V3_LB_BASE_ADR_SIZE_256MB;
647 break;
648 case SZ_512M:
649 val |= V3_LB_BASE_ADR_SIZE_512MB;
650 break;
651 case SZ_1G:
652 val |= V3_LB_BASE_ADR_SIZE_1GB;
653 break;
654 case SZ_2G:
655 val |= V3_LB_BASE_ADR_SIZE_2GB;
656 break;
657 default:
658 dev_err(v3->dev, "illegal dma memory chunk size\n");
659 return -EINVAL;
660 }
661 val |= V3_PCI_MAP_M_REG_EN | V3_PCI_MAP_M_ENABLE;
662 *pci_map = val;
663
664 dev_dbg(dev,
665 "DMA MEM CPU: 0x%016llx -> 0x%016llx => "
666 "PCI: 0x%016llx -> 0x%016llx base %08x map %08x\n",
667 cpu_addr, cpu_end,
668 pci_addr, pci_end,
669 *pci_base, *pci_map);
670
671 return 0;
672}
673
674static int v3_pci_parse_map_dma_ranges(struct v3_pci *v3,
675 struct device_node *np)
676{
677 struct pci_host_bridge *bridge = pci_host_bridge_from_priv(v3);
678 struct device *dev = v3->dev;
679 struct resource_entry *entry;
680 int i = 0;
681
682 resource_list_for_each_entry(entry, &bridge->dma_ranges) {
683 int ret;
684 u32 pci_base, pci_map;
685
686 ret = v3_get_dma_range_config(v3, entry, &pci_base, &pci_map);
687 if (ret)
688 return ret;
689
690 if (i == 0) {
691 writel(pci_base, v3->base + V3_PCI_BASE0);
692 writel(pci_map, v3->base + V3_PCI_MAP0);
693 } else if (i == 1) {
694 writel(pci_base, v3->base + V3_PCI_BASE1);
695 writel(pci_map, v3->base + V3_PCI_MAP1);
696 } else {
697 dev_err(dev, "too many ranges, only two supported\n");
698 dev_err(dev, "range %d ignored\n", i);
699 }
700 i++;
701 }
702 return 0;
703}
704
705static int v3_pci_probe(struct platform_device *pdev)
706{
707 struct device *dev = &pdev->dev;
708 struct device_node *np = dev->of_node;
709 struct resource *regs;
710 struct resource_entry *win;
711 struct v3_pci *v3;
712 struct pci_host_bridge *host;
713 struct clk *clk;
714 u16 val;
715 int irq;
716 int ret;
717
718 host = devm_pci_alloc_host_bridge(dev, sizeof(*v3));
719 if (!host)
720 return -ENOMEM;
721
722 host->ops = &v3_pci_ops;
723 v3 = pci_host_bridge_priv(host);
724 host->sysdata = v3;
725 v3->dev = dev;
726
727 /* Get and enable host clock */
728 clk = devm_clk_get(dev, NULL);
729 if (IS_ERR(clk)) {
730 dev_err(dev, "clock not found\n");
731 return PTR_ERR(clk);
732 }
733 ret = clk_prepare_enable(clk);
734 if (ret) {
735 dev_err(dev, "unable to enable clock\n");
736 return ret;
737 }
738
739 regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
740 v3->base = devm_ioremap_resource(dev, regs);
741 if (IS_ERR(v3->base))
742 return PTR_ERR(v3->base);
743 /*
744 * The hardware has a register with the physical base address
745 * of the V3 controller itself, verify that this is the same
746 * as the physical memory we've remapped it from.
747 */
748 if (readl(v3->base + V3_LB_IO_BASE) != (regs->start >> 16))
749 dev_err(dev, "V3_LB_IO_BASE = %08x but device is @%pR\n",
750 readl(v3->base + V3_LB_IO_BASE), regs);
751
752 /* Configuration space is 16MB directly mapped */
753 regs = platform_get_resource(pdev, IORESOURCE_MEM, 1);
754 if (resource_size(regs) != SZ_16M) {
755 dev_err(dev, "config mem is not 16MB!\n");
756 return -EINVAL;
757 }
758 v3->config_mem = regs->start;
759 v3->config_base = devm_ioremap_resource(dev, regs);
760 if (IS_ERR(v3->config_base))
761 return PTR_ERR(v3->config_base);
762
763 /* Get and request error IRQ resource */
764 irq = platform_get_irq(pdev, 0);
765 if (irq < 0)
766 return irq;
767
768 ret = devm_request_irq(dev, irq, v3_irq, 0,
769 "PCIv3 error", v3);
770 if (ret < 0) {
771 dev_err(dev,
772 "unable to request PCIv3 error IRQ %d (%d)\n",
773 irq, ret);
774 return ret;
775 }
776
777 /*
778 * Unlock V3 registers, but only if they were previously locked.
779 */
780 if (readw(v3->base + V3_SYSTEM) & V3_SYSTEM_M_LOCK)
781 writew(V3_SYSTEM_UNLOCK, v3->base + V3_SYSTEM);
782
783 /* Disable all slave access while we set up the windows */
784 val = readw(v3->base + V3_PCI_CMD);
785 val &= ~(PCI_COMMAND_IO | PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER);
786 writew(val, v3->base + V3_PCI_CMD);
787
788 /* Put the PCI bus into reset */
789 val = readw(v3->base + V3_SYSTEM);
790 val &= ~V3_SYSTEM_M_RST_OUT;
791 writew(val, v3->base + V3_SYSTEM);
792
793 /* Retry until we're ready */
794 val = readw(v3->base + V3_PCI_CFG);
795 val |= V3_PCI_CFG_M_RETRY_EN;
796 writew(val, v3->base + V3_PCI_CFG);
797
798 /* Set up the local bus protocol */
799 val = readw(v3->base + V3_LB_CFG);
800 val |= V3_LB_CFG_LB_BE_IMODE; /* Byte enable input */
801 val |= V3_LB_CFG_LB_BE_OMODE; /* Byte enable output */
802 val &= ~V3_LB_CFG_LB_ENDIAN; /* Little endian */
803 val &= ~V3_LB_CFG_LB_PPC_RDY; /* TODO: when using on PPC403Gx, set to 1 */
804 writew(val, v3->base + V3_LB_CFG);
805
806 /* Enable the PCI bus master */
807 val = readw(v3->base + V3_PCI_CMD);
808 val |= PCI_COMMAND_MASTER;
809 writew(val, v3->base + V3_PCI_CMD);
810
811 /* Get the I/O and memory ranges from DT */
812 resource_list_for_each_entry(win, &host->windows) {
813 ret = v3_pci_setup_resource(v3, host, win);
814 if (ret) {
815 dev_err(dev, "error setting up resources\n");
816 return ret;
817 }
818 }
819 ret = v3_pci_parse_map_dma_ranges(v3, np);
820 if (ret)
821 return ret;
822
823 /*
824 * Disable PCI to host IO cycles, enable I/O buffers @3.3V,
825 * set AD_LOW0 to 1 if one of the LB_MAP registers choose
826 * to use this (should be unused).
827 */
828 writel(0x00000000, v3->base + V3_PCI_IO_BASE);
829 val = V3_PCI_CFG_M_IO_REG_DIS | V3_PCI_CFG_M_IO_DIS |
830 V3_PCI_CFG_M_EN3V | V3_PCI_CFG_M_AD_LOW0;
831 /*
832 * DMA read and write from PCI bus commands types
833 */
834 val |= V3_PCI_CFG_TYPE_DEFAULT << V3_PCI_CFG_M_RTYPE_SHIFT;
835 val |= V3_PCI_CFG_TYPE_DEFAULT << V3_PCI_CFG_M_WTYPE_SHIFT;
836 writew(val, v3->base + V3_PCI_CFG);
837
838 /*
839 * Set the V3 FIFO such that writes have higher priority than
840 * reads, and local bus write causes local bus read fifo flush
841 * on aperture 1. Same for PCI.
842 */
843 writew(V3_FIFO_PRIO_LB_RD1_FLUSH_AP1 |
844 V3_FIFO_PRIO_LB_RD0_FLUSH_AP1 |
845 V3_FIFO_PRIO_PCI_RD1_FLUSH_AP1 |
846 V3_FIFO_PRIO_PCI_RD0_FLUSH_AP1,
847 v3->base + V3_FIFO_PRIORITY);
848
849
850 /*
851 * Clear any error interrupts, and enable parity and write error
852 * interrupts
853 */
854 writeb(0, v3->base + V3_LB_ISTAT);
855 val = readw(v3->base + V3_LB_CFG);
856 val |= V3_LB_CFG_LB_LB_INT;
857 writew(val, v3->base + V3_LB_CFG);
858 writeb(V3_LB_ISTAT_PCI_WR | V3_LB_ISTAT_PCI_PERR,
859 v3->base + V3_LB_IMASK);
860
861 /* Special Integrator initialization */
862 if (of_device_is_compatible(np, "arm,integrator-ap-pci")) {
863 ret = v3_integrator_init(v3);
864 if (ret)
865 return ret;
866 }
867
868 /* Post-init: enable PCI memory and invalidate (master already on) */
869 val = readw(v3->base + V3_PCI_CMD);
870 val |= PCI_COMMAND_MEMORY | PCI_COMMAND_INVALIDATE;
871 writew(val, v3->base + V3_PCI_CMD);
872
873 /* Clear pending interrupts */
874 writeb(0, v3->base + V3_LB_ISTAT);
875 /* Read or write errors and parity errors cause interrupts */
876 writeb(V3_LB_ISTAT_PCI_RD | V3_LB_ISTAT_PCI_WR | V3_LB_ISTAT_PCI_PERR,
877 v3->base + V3_LB_IMASK);
878
879 /* Take the PCI bus out of reset so devices can initialize */
880 val = readw(v3->base + V3_SYSTEM);
881 val |= V3_SYSTEM_M_RST_OUT;
882 writew(val, v3->base + V3_SYSTEM);
883
884 /*
885 * Re-lock the system register.
886 */
887 val = readw(v3->base + V3_SYSTEM);
888 val |= V3_SYSTEM_M_LOCK;
889 writew(val, v3->base + V3_SYSTEM);
890
891 return pci_host_probe(host);
892}
893
894static const struct of_device_id v3_pci_of_match[] = {
895 {
896 .compatible = "v3,v360epc-pci",
897 },
898 {},
899};
900
901static struct platform_driver v3_pci_driver = {
902 .driver = {
903 .name = "pci-v3-semi",
904 .of_match_table = v3_pci_of_match,
905 .suppress_bind_attrs = true,
906 },
907 .probe = v3_pci_probe,
908};
909builtin_platform_driver(v3_pci_driver);