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