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1// SPDX-License-Identifier: GPL-2.0+
2/* Copyright (C) 2009 - 2019 Broadcom */
3
4#include <linux/bitfield.h>
5#include <linux/bitops.h>
6#include <linux/clk.h>
7#include <linux/compiler.h>
8#include <linux/delay.h>
9#include <linux/init.h>
10#include <linux/interrupt.h>
11#include <linux/io.h>
12#include <linux/ioport.h>
13#include <linux/irqchip/chained_irq.h>
14#include <linux/irqdomain.h>
15#include <linux/kernel.h>
16#include <linux/list.h>
17#include <linux/log2.h>
18#include <linux/module.h>
19#include <linux/msi.h>
20#include <linux/of_address.h>
21#include <linux/of_irq.h>
22#include <linux/of_pci.h>
23#include <linux/of_platform.h>
24#include <linux/pci.h>
25#include <linux/printk.h>
26#include <linux/sizes.h>
27#include <linux/slab.h>
28#include <linux/string.h>
29#include <linux/types.h>
30
31#include <soc/bcm2835/raspberrypi-firmware.h>
32
33#include "../pci.h"
34
35/* BRCM_PCIE_CAP_REGS - Offset for the mandatory capability config regs */
36#define BRCM_PCIE_CAP_REGS 0x00ac
37
38/* Broadcom STB PCIe Register Offsets */
39#define PCIE_RC_CFG_VENDOR_VENDOR_SPECIFIC_REG1 0x0188
40#define PCIE_RC_CFG_VENDOR_VENDOR_SPECIFIC_REG1_ENDIAN_MODE_BAR2_MASK 0xc
41#define PCIE_RC_CFG_VENDOR_SPCIFIC_REG1_LITTLE_ENDIAN 0x0
42
43#define PCIE_RC_CFG_PRIV1_ID_VAL3 0x043c
44#define PCIE_RC_CFG_PRIV1_ID_VAL3_CLASS_CODE_MASK 0xffffff
45
46#define PCIE_RC_CFG_PRIV1_LINK_CAPABILITY 0x04dc
47#define PCIE_RC_CFG_PRIV1_LINK_CAPABILITY_ASPM_SUPPORT_MASK 0xc00
48
49#define PCIE_RC_DL_MDIO_ADDR 0x1100
50#define PCIE_RC_DL_MDIO_WR_DATA 0x1104
51#define PCIE_RC_DL_MDIO_RD_DATA 0x1108
52
53#define PCIE_MISC_MISC_CTRL 0x4008
54#define PCIE_MISC_MISC_CTRL_SCB_ACCESS_EN_MASK 0x1000
55#define PCIE_MISC_MISC_CTRL_CFG_READ_UR_MODE_MASK 0x2000
56#define PCIE_MISC_MISC_CTRL_MAX_BURST_SIZE_MASK 0x300000
57#define PCIE_MISC_MISC_CTRL_MAX_BURST_SIZE_128 0x0
58#define PCIE_MISC_MISC_CTRL_SCB0_SIZE_MASK 0xf8000000
59
60#define PCIE_MISC_CPU_2_PCIE_MEM_WIN0_LO 0x400c
61#define PCIE_MEM_WIN0_LO(win) \
62 PCIE_MISC_CPU_2_PCIE_MEM_WIN0_LO + ((win) * 8)
63
64#define PCIE_MISC_CPU_2_PCIE_MEM_WIN0_HI 0x4010
65#define PCIE_MEM_WIN0_HI(win) \
66 PCIE_MISC_CPU_2_PCIE_MEM_WIN0_HI + ((win) * 8)
67
68#define PCIE_MISC_RC_BAR1_CONFIG_LO 0x402c
69#define PCIE_MISC_RC_BAR1_CONFIG_LO_SIZE_MASK 0x1f
70
71#define PCIE_MISC_RC_BAR2_CONFIG_LO 0x4034
72#define PCIE_MISC_RC_BAR2_CONFIG_LO_SIZE_MASK 0x1f
73#define PCIE_MISC_RC_BAR2_CONFIG_HI 0x4038
74
75#define PCIE_MISC_RC_BAR3_CONFIG_LO 0x403c
76#define PCIE_MISC_RC_BAR3_CONFIG_LO_SIZE_MASK 0x1f
77
78#define PCIE_MISC_MSI_BAR_CONFIG_LO 0x4044
79#define PCIE_MISC_MSI_BAR_CONFIG_HI 0x4048
80
81#define PCIE_MISC_MSI_DATA_CONFIG 0x404c
82#define PCIE_MISC_MSI_DATA_CONFIG_VAL 0xffe06540
83
84#define PCIE_MISC_PCIE_CTRL 0x4064
85#define PCIE_MISC_PCIE_CTRL_PCIE_L23_REQUEST_MASK 0x1
86
87#define PCIE_MISC_PCIE_STATUS 0x4068
88#define PCIE_MISC_PCIE_STATUS_PCIE_PORT_MASK 0x80
89#define PCIE_MISC_PCIE_STATUS_PCIE_DL_ACTIVE_MASK 0x20
90#define PCIE_MISC_PCIE_STATUS_PCIE_PHYLINKUP_MASK 0x10
91#define PCIE_MISC_PCIE_STATUS_PCIE_LINK_IN_L23_MASK 0x40
92
93#define PCIE_MISC_CPU_2_PCIE_MEM_WIN0_BASE_LIMIT 0x4070
94#define PCIE_MISC_CPU_2_PCIE_MEM_WIN0_BASE_LIMIT_LIMIT_MASK 0xfff00000
95#define PCIE_MISC_CPU_2_PCIE_MEM_WIN0_BASE_LIMIT_BASE_MASK 0xfff0
96#define PCIE_MEM_WIN0_BASE_LIMIT(win) \
97 PCIE_MISC_CPU_2_PCIE_MEM_WIN0_BASE_LIMIT + ((win) * 4)
98
99#define PCIE_MISC_CPU_2_PCIE_MEM_WIN0_BASE_HI 0x4080
100#define PCIE_MISC_CPU_2_PCIE_MEM_WIN0_BASE_HI_BASE_MASK 0xff
101#define PCIE_MEM_WIN0_BASE_HI(win) \
102 PCIE_MISC_CPU_2_PCIE_MEM_WIN0_BASE_HI + ((win) * 8)
103
104#define PCIE_MISC_CPU_2_PCIE_MEM_WIN0_LIMIT_HI 0x4084
105#define PCIE_MISC_CPU_2_PCIE_MEM_WIN0_LIMIT_HI_LIMIT_MASK 0xff
106#define PCIE_MEM_WIN0_LIMIT_HI(win) \
107 PCIE_MISC_CPU_2_PCIE_MEM_WIN0_LIMIT_HI + ((win) * 8)
108
109#define PCIE_MISC_HARD_PCIE_HARD_DEBUG 0x4204
110#define PCIE_MISC_HARD_PCIE_HARD_DEBUG_CLKREQ_DEBUG_ENABLE_MASK 0x2
111#define PCIE_MISC_HARD_PCIE_HARD_DEBUG_SERDES_IDDQ_MASK 0x08000000
112
113#define PCIE_MSI_INTR2_STATUS 0x4500
114#define PCIE_MSI_INTR2_CLR 0x4508
115#define PCIE_MSI_INTR2_MASK_SET 0x4510
116#define PCIE_MSI_INTR2_MASK_CLR 0x4514
117
118#define PCIE_EXT_CFG_DATA 0x8000
119
120#define PCIE_EXT_CFG_INDEX 0x9000
121#define PCIE_EXT_BUSNUM_SHIFT 20
122#define PCIE_EXT_SLOT_SHIFT 15
123#define PCIE_EXT_FUNC_SHIFT 12
124
125#define PCIE_RGR1_SW_INIT_1 0x9210
126#define PCIE_RGR1_SW_INIT_1_PERST_MASK 0x1
127#define PCIE_RGR1_SW_INIT_1_INIT_MASK 0x2
128
129/* PCIe parameters */
130#define BRCM_NUM_PCIE_OUT_WINS 0x4
131#define BRCM_INT_PCI_MSI_NR 32
132
133/* MSI target adresses */
134#define BRCM_MSI_TARGET_ADDR_LT_4GB 0x0fffffffcULL
135#define BRCM_MSI_TARGET_ADDR_GT_4GB 0xffffffffcULL
136
137/* MDIO registers */
138#define MDIO_PORT0 0x0
139#define MDIO_DATA_MASK 0x7fffffff
140#define MDIO_PORT_MASK 0xf0000
141#define MDIO_REGAD_MASK 0xffff
142#define MDIO_CMD_MASK 0xfff00000
143#define MDIO_CMD_READ 0x1
144#define MDIO_CMD_WRITE 0x0
145#define MDIO_DATA_DONE_MASK 0x80000000
146#define MDIO_RD_DONE(x) (((x) & MDIO_DATA_DONE_MASK) ? 1 : 0)
147#define MDIO_WT_DONE(x) (((x) & MDIO_DATA_DONE_MASK) ? 0 : 1)
148#define SSC_REGS_ADDR 0x1100
149#define SET_ADDR_OFFSET 0x1f
150#define SSC_CNTL_OFFSET 0x2
151#define SSC_CNTL_OVRD_EN_MASK 0x8000
152#define SSC_CNTL_OVRD_VAL_MASK 0x4000
153#define SSC_STATUS_OFFSET 0x1
154#define SSC_STATUS_SSC_MASK 0x400
155#define SSC_STATUS_PLL_LOCK_MASK 0x800
156
157struct brcm_msi {
158 struct device *dev;
159 void __iomem *base;
160 struct device_node *np;
161 struct irq_domain *msi_domain;
162 struct irq_domain *inner_domain;
163 struct mutex lock; /* guards the alloc/free operations */
164 u64 target_addr;
165 int irq;
166 /* used indicates which MSI interrupts have been alloc'd */
167 unsigned long used;
168};
169
170/* Internal PCIe Host Controller Information.*/
171struct brcm_pcie {
172 struct device *dev;
173 void __iomem *base;
174 struct clk *clk;
175 struct device_node *np;
176 bool ssc;
177 int gen;
178 u64 msi_target_addr;
179 struct brcm_msi *msi;
180};
181
182/*
183 * This is to convert the size of the inbound "BAR" region to the
184 * non-linear values of PCIE_X_MISC_RC_BAR[123]_CONFIG_LO.SIZE
185 */
186static int brcm_pcie_encode_ibar_size(u64 size)
187{
188 int log2_in = ilog2(size);
189
190 if (log2_in >= 12 && log2_in <= 15)
191 /* Covers 4KB to 32KB (inclusive) */
192 return (log2_in - 12) + 0x1c;
193 else if (log2_in >= 16 && log2_in <= 35)
194 /* Covers 64KB to 32GB, (inclusive) */
195 return log2_in - 15;
196 /* Something is awry so disable */
197 return 0;
198}
199
200static u32 brcm_pcie_mdio_form_pkt(int port, int regad, int cmd)
201{
202 u32 pkt = 0;
203
204 pkt |= FIELD_PREP(MDIO_PORT_MASK, port);
205 pkt |= FIELD_PREP(MDIO_REGAD_MASK, regad);
206 pkt |= FIELD_PREP(MDIO_CMD_MASK, cmd);
207
208 return pkt;
209}
210
211/* negative return value indicates error */
212static int brcm_pcie_mdio_read(void __iomem *base, u8 port, u8 regad, u32 *val)
213{
214 int tries;
215 u32 data;
216
217 writel(brcm_pcie_mdio_form_pkt(port, regad, MDIO_CMD_READ),
218 base + PCIE_RC_DL_MDIO_ADDR);
219 readl(base + PCIE_RC_DL_MDIO_ADDR);
220
221 data = readl(base + PCIE_RC_DL_MDIO_RD_DATA);
222 for (tries = 0; !MDIO_RD_DONE(data) && tries < 10; tries++) {
223 udelay(10);
224 data = readl(base + PCIE_RC_DL_MDIO_RD_DATA);
225 }
226
227 *val = FIELD_GET(MDIO_DATA_MASK, data);
228 return MDIO_RD_DONE(data) ? 0 : -EIO;
229}
230
231/* negative return value indicates error */
232static int brcm_pcie_mdio_write(void __iomem *base, u8 port,
233 u8 regad, u16 wrdata)
234{
235 int tries;
236 u32 data;
237
238 writel(brcm_pcie_mdio_form_pkt(port, regad, MDIO_CMD_WRITE),
239 base + PCIE_RC_DL_MDIO_ADDR);
240 readl(base + PCIE_RC_DL_MDIO_ADDR);
241 writel(MDIO_DATA_DONE_MASK | wrdata, base + PCIE_RC_DL_MDIO_WR_DATA);
242
243 data = readl(base + PCIE_RC_DL_MDIO_WR_DATA);
244 for (tries = 0; !MDIO_WT_DONE(data) && tries < 10; tries++) {
245 udelay(10);
246 data = readl(base + PCIE_RC_DL_MDIO_WR_DATA);
247 }
248
249 return MDIO_WT_DONE(data) ? 0 : -EIO;
250}
251
252/*
253 * Configures device for Spread Spectrum Clocking (SSC) mode; a negative
254 * return value indicates error.
255 */
256static int brcm_pcie_set_ssc(struct brcm_pcie *pcie)
257{
258 int pll, ssc;
259 int ret;
260 u32 tmp;
261
262 ret = brcm_pcie_mdio_write(pcie->base, MDIO_PORT0, SET_ADDR_OFFSET,
263 SSC_REGS_ADDR);
264 if (ret < 0)
265 return ret;
266
267 ret = brcm_pcie_mdio_read(pcie->base, MDIO_PORT0,
268 SSC_CNTL_OFFSET, &tmp);
269 if (ret < 0)
270 return ret;
271
272 u32p_replace_bits(&tmp, 1, SSC_CNTL_OVRD_EN_MASK);
273 u32p_replace_bits(&tmp, 1, SSC_CNTL_OVRD_VAL_MASK);
274 ret = brcm_pcie_mdio_write(pcie->base, MDIO_PORT0,
275 SSC_CNTL_OFFSET, tmp);
276 if (ret < 0)
277 return ret;
278
279 usleep_range(1000, 2000);
280 ret = brcm_pcie_mdio_read(pcie->base, MDIO_PORT0,
281 SSC_STATUS_OFFSET, &tmp);
282 if (ret < 0)
283 return ret;
284
285 ssc = FIELD_GET(SSC_STATUS_SSC_MASK, tmp);
286 pll = FIELD_GET(SSC_STATUS_PLL_LOCK_MASK, tmp);
287
288 return ssc && pll ? 0 : -EIO;
289}
290
291/* Limits operation to a specific generation (1, 2, or 3) */
292static void brcm_pcie_set_gen(struct brcm_pcie *pcie, int gen)
293{
294 u16 lnkctl2 = readw(pcie->base + BRCM_PCIE_CAP_REGS + PCI_EXP_LNKCTL2);
295 u32 lnkcap = readl(pcie->base + BRCM_PCIE_CAP_REGS + PCI_EXP_LNKCAP);
296
297 lnkcap = (lnkcap & ~PCI_EXP_LNKCAP_SLS) | gen;
298 writel(lnkcap, pcie->base + BRCM_PCIE_CAP_REGS + PCI_EXP_LNKCAP);
299
300 lnkctl2 = (lnkctl2 & ~0xf) | gen;
301 writew(lnkctl2, pcie->base + BRCM_PCIE_CAP_REGS + PCI_EXP_LNKCTL2);
302}
303
304static void brcm_pcie_set_outbound_win(struct brcm_pcie *pcie,
305 unsigned int win, u64 cpu_addr,
306 u64 pcie_addr, u64 size)
307{
308 u32 cpu_addr_mb_high, limit_addr_mb_high;
309 phys_addr_t cpu_addr_mb, limit_addr_mb;
310 int high_addr_shift;
311 u32 tmp;
312
313 /* Set the base of the pcie_addr window */
314 writel(lower_32_bits(pcie_addr), pcie->base + PCIE_MEM_WIN0_LO(win));
315 writel(upper_32_bits(pcie_addr), pcie->base + PCIE_MEM_WIN0_HI(win));
316
317 /* Write the addr base & limit lower bits (in MBs) */
318 cpu_addr_mb = cpu_addr / SZ_1M;
319 limit_addr_mb = (cpu_addr + size - 1) / SZ_1M;
320
321 tmp = readl(pcie->base + PCIE_MEM_WIN0_BASE_LIMIT(win));
322 u32p_replace_bits(&tmp, cpu_addr_mb,
323 PCIE_MISC_CPU_2_PCIE_MEM_WIN0_BASE_LIMIT_BASE_MASK);
324 u32p_replace_bits(&tmp, limit_addr_mb,
325 PCIE_MISC_CPU_2_PCIE_MEM_WIN0_BASE_LIMIT_LIMIT_MASK);
326 writel(tmp, pcie->base + PCIE_MEM_WIN0_BASE_LIMIT(win));
327
328 /* Write the cpu & limit addr upper bits */
329 high_addr_shift =
330 HWEIGHT32(PCIE_MISC_CPU_2_PCIE_MEM_WIN0_BASE_LIMIT_BASE_MASK);
331
332 cpu_addr_mb_high = cpu_addr_mb >> high_addr_shift;
333 tmp = readl(pcie->base + PCIE_MEM_WIN0_BASE_HI(win));
334 u32p_replace_bits(&tmp, cpu_addr_mb_high,
335 PCIE_MISC_CPU_2_PCIE_MEM_WIN0_BASE_HI_BASE_MASK);
336 writel(tmp, pcie->base + PCIE_MEM_WIN0_BASE_HI(win));
337
338 limit_addr_mb_high = limit_addr_mb >> high_addr_shift;
339 tmp = readl(pcie->base + PCIE_MEM_WIN0_LIMIT_HI(win));
340 u32p_replace_bits(&tmp, limit_addr_mb_high,
341 PCIE_MISC_CPU_2_PCIE_MEM_WIN0_LIMIT_HI_LIMIT_MASK);
342 writel(tmp, pcie->base + PCIE_MEM_WIN0_LIMIT_HI(win));
343}
344
345static struct irq_chip brcm_msi_irq_chip = {
346 .name = "BRCM STB PCIe MSI",
347 .irq_ack = irq_chip_ack_parent,
348 .irq_mask = pci_msi_mask_irq,
349 .irq_unmask = pci_msi_unmask_irq,
350};
351
352static struct msi_domain_info brcm_msi_domain_info = {
353 /* Multi MSI is supported by the controller, but not by this driver */
354 .flags = (MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS),
355 .chip = &brcm_msi_irq_chip,
356};
357
358static void brcm_pcie_msi_isr(struct irq_desc *desc)
359{
360 struct irq_chip *chip = irq_desc_get_chip(desc);
361 unsigned long status, virq;
362 struct brcm_msi *msi;
363 struct device *dev;
364 u32 bit;
365
366 chained_irq_enter(chip, desc);
367 msi = irq_desc_get_handler_data(desc);
368 dev = msi->dev;
369
370 status = readl(msi->base + PCIE_MSI_INTR2_STATUS);
371 for_each_set_bit(bit, &status, BRCM_INT_PCI_MSI_NR) {
372 virq = irq_find_mapping(msi->inner_domain, bit);
373 if (virq)
374 generic_handle_irq(virq);
375 else
376 dev_dbg(dev, "unexpected MSI\n");
377 }
378
379 chained_irq_exit(chip, desc);
380}
381
382static void brcm_msi_compose_msi_msg(struct irq_data *data, struct msi_msg *msg)
383{
384 struct brcm_msi *msi = irq_data_get_irq_chip_data(data);
385
386 msg->address_lo = lower_32_bits(msi->target_addr);
387 msg->address_hi = upper_32_bits(msi->target_addr);
388 msg->data = (0xffff & PCIE_MISC_MSI_DATA_CONFIG_VAL) | data->hwirq;
389}
390
391static int brcm_msi_set_affinity(struct irq_data *irq_data,
392 const struct cpumask *mask, bool force)
393{
394 return -EINVAL;
395}
396
397static void brcm_msi_ack_irq(struct irq_data *data)
398{
399 struct brcm_msi *msi = irq_data_get_irq_chip_data(data);
400
401 writel(1 << data->hwirq, msi->base + PCIE_MSI_INTR2_CLR);
402}
403
404
405static struct irq_chip brcm_msi_bottom_irq_chip = {
406 .name = "BRCM STB MSI",
407 .irq_compose_msi_msg = brcm_msi_compose_msi_msg,
408 .irq_set_affinity = brcm_msi_set_affinity,
409 .irq_ack = brcm_msi_ack_irq,
410};
411
412static int brcm_msi_alloc(struct brcm_msi *msi)
413{
414 int hwirq;
415
416 mutex_lock(&msi->lock);
417 hwirq = bitmap_find_free_region(&msi->used, BRCM_INT_PCI_MSI_NR, 0);
418 mutex_unlock(&msi->lock);
419
420 return hwirq;
421}
422
423static void brcm_msi_free(struct brcm_msi *msi, unsigned long hwirq)
424{
425 mutex_lock(&msi->lock);
426 bitmap_release_region(&msi->used, hwirq, 0);
427 mutex_unlock(&msi->lock);
428}
429
430static int brcm_irq_domain_alloc(struct irq_domain *domain, unsigned int virq,
431 unsigned int nr_irqs, void *args)
432{
433 struct brcm_msi *msi = domain->host_data;
434 int hwirq;
435
436 hwirq = brcm_msi_alloc(msi);
437
438 if (hwirq < 0)
439 return hwirq;
440
441 irq_domain_set_info(domain, virq, (irq_hw_number_t)hwirq,
442 &brcm_msi_bottom_irq_chip, domain->host_data,
443 handle_edge_irq, NULL, NULL);
444 return 0;
445}
446
447static void brcm_irq_domain_free(struct irq_domain *domain,
448 unsigned int virq, unsigned int nr_irqs)
449{
450 struct irq_data *d = irq_domain_get_irq_data(domain, virq);
451 struct brcm_msi *msi = irq_data_get_irq_chip_data(d);
452
453 brcm_msi_free(msi, d->hwirq);
454}
455
456static const struct irq_domain_ops msi_domain_ops = {
457 .alloc = brcm_irq_domain_alloc,
458 .free = brcm_irq_domain_free,
459};
460
461static int brcm_allocate_domains(struct brcm_msi *msi)
462{
463 struct fwnode_handle *fwnode = of_node_to_fwnode(msi->np);
464 struct device *dev = msi->dev;
465
466 msi->inner_domain = irq_domain_add_linear(NULL, BRCM_INT_PCI_MSI_NR,
467 &msi_domain_ops, msi);
468 if (!msi->inner_domain) {
469 dev_err(dev, "failed to create IRQ domain\n");
470 return -ENOMEM;
471 }
472
473 msi->msi_domain = pci_msi_create_irq_domain(fwnode,
474 &brcm_msi_domain_info,
475 msi->inner_domain);
476 if (!msi->msi_domain) {
477 dev_err(dev, "failed to create MSI domain\n");
478 irq_domain_remove(msi->inner_domain);
479 return -ENOMEM;
480 }
481
482 return 0;
483}
484
485static void brcm_free_domains(struct brcm_msi *msi)
486{
487 irq_domain_remove(msi->msi_domain);
488 irq_domain_remove(msi->inner_domain);
489}
490
491static void brcm_msi_remove(struct brcm_pcie *pcie)
492{
493 struct brcm_msi *msi = pcie->msi;
494
495 if (!msi)
496 return;
497 irq_set_chained_handler(msi->irq, NULL);
498 irq_set_handler_data(msi->irq, NULL);
499 brcm_free_domains(msi);
500}
501
502static void brcm_msi_set_regs(struct brcm_msi *msi)
503{
504 writel(0xffffffff, msi->base + PCIE_MSI_INTR2_MASK_CLR);
505
506 /*
507 * The 0 bit of PCIE_MISC_MSI_BAR_CONFIG_LO is repurposed to MSI
508 * enable, which we set to 1.
509 */
510 writel(lower_32_bits(msi->target_addr) | 0x1,
511 msi->base + PCIE_MISC_MSI_BAR_CONFIG_LO);
512 writel(upper_32_bits(msi->target_addr),
513 msi->base + PCIE_MISC_MSI_BAR_CONFIG_HI);
514
515 writel(PCIE_MISC_MSI_DATA_CONFIG_VAL,
516 msi->base + PCIE_MISC_MSI_DATA_CONFIG);
517}
518
519static int brcm_pcie_enable_msi(struct brcm_pcie *pcie)
520{
521 struct brcm_msi *msi;
522 int irq, ret;
523 struct device *dev = pcie->dev;
524
525 irq = irq_of_parse_and_map(dev->of_node, 1);
526 if (irq <= 0) {
527 dev_err(dev, "cannot map MSI interrupt\n");
528 return -ENODEV;
529 }
530
531 msi = devm_kzalloc(dev, sizeof(struct brcm_msi), GFP_KERNEL);
532 if (!msi)
533 return -ENOMEM;
534
535 mutex_init(&msi->lock);
536 msi->dev = dev;
537 msi->base = pcie->base;
538 msi->np = pcie->np;
539 msi->target_addr = pcie->msi_target_addr;
540 msi->irq = irq;
541
542 ret = brcm_allocate_domains(msi);
543 if (ret)
544 return ret;
545
546 irq_set_chained_handler_and_data(msi->irq, brcm_pcie_msi_isr, msi);
547
548 brcm_msi_set_regs(msi);
549 pcie->msi = msi;
550
551 return 0;
552}
553
554/* The controller is capable of serving in both RC and EP roles */
555static bool brcm_pcie_rc_mode(struct brcm_pcie *pcie)
556{
557 void __iomem *base = pcie->base;
558 u32 val = readl(base + PCIE_MISC_PCIE_STATUS);
559
560 return !!FIELD_GET(PCIE_MISC_PCIE_STATUS_PCIE_PORT_MASK, val);
561}
562
563static bool brcm_pcie_link_up(struct brcm_pcie *pcie)
564{
565 u32 val = readl(pcie->base + PCIE_MISC_PCIE_STATUS);
566 u32 dla = FIELD_GET(PCIE_MISC_PCIE_STATUS_PCIE_DL_ACTIVE_MASK, val);
567 u32 plu = FIELD_GET(PCIE_MISC_PCIE_STATUS_PCIE_PHYLINKUP_MASK, val);
568
569 return dla && plu;
570}
571
572/* Configuration space read/write support */
573static inline int brcm_pcie_cfg_index(int busnr, int devfn, int reg)
574{
575 return ((PCI_SLOT(devfn) & 0x1f) << PCIE_EXT_SLOT_SHIFT)
576 | ((PCI_FUNC(devfn) & 0x07) << PCIE_EXT_FUNC_SHIFT)
577 | (busnr << PCIE_EXT_BUSNUM_SHIFT)
578 | (reg & ~3);
579}
580
581static void __iomem *brcm_pcie_map_conf(struct pci_bus *bus, unsigned int devfn,
582 int where)
583{
584 struct brcm_pcie *pcie = bus->sysdata;
585 void __iomem *base = pcie->base;
586 int idx;
587
588 /* Accesses to the RC go right to the RC registers if slot==0 */
589 if (pci_is_root_bus(bus))
590 return PCI_SLOT(devfn) ? NULL : base + where;
591
592 /* For devices, write to the config space index register */
593 idx = brcm_pcie_cfg_index(bus->number, devfn, 0);
594 writel(idx, pcie->base + PCIE_EXT_CFG_INDEX);
595 return base + PCIE_EXT_CFG_DATA + where;
596}
597
598static struct pci_ops brcm_pcie_ops = {
599 .map_bus = brcm_pcie_map_conf,
600 .read = pci_generic_config_read,
601 .write = pci_generic_config_write,
602};
603
604static inline void brcm_pcie_bridge_sw_init_set(struct brcm_pcie *pcie, u32 val)
605{
606 u32 tmp;
607
608 tmp = readl(pcie->base + PCIE_RGR1_SW_INIT_1);
609 u32p_replace_bits(&tmp, val, PCIE_RGR1_SW_INIT_1_INIT_MASK);
610 writel(tmp, pcie->base + PCIE_RGR1_SW_INIT_1);
611}
612
613static inline void brcm_pcie_perst_set(struct brcm_pcie *pcie, u32 val)
614{
615 u32 tmp;
616
617 tmp = readl(pcie->base + PCIE_RGR1_SW_INIT_1);
618 u32p_replace_bits(&tmp, val, PCIE_RGR1_SW_INIT_1_PERST_MASK);
619 writel(tmp, pcie->base + PCIE_RGR1_SW_INIT_1);
620}
621
622static inline int brcm_pcie_get_rc_bar2_size_and_offset(struct brcm_pcie *pcie,
623 u64 *rc_bar2_size,
624 u64 *rc_bar2_offset)
625{
626 struct pci_host_bridge *bridge = pci_host_bridge_from_priv(pcie);
627 struct device *dev = pcie->dev;
628 struct resource_entry *entry;
629
630 entry = resource_list_first_type(&bridge->dma_ranges, IORESOURCE_MEM);
631 if (!entry)
632 return -ENODEV;
633
634
635 /*
636 * The controller expects the inbound window offset to be calculated as
637 * the difference between PCIe's address space and CPU's. The offset
638 * provided by the firmware is calculated the opposite way, so we
639 * negate it.
640 */
641 *rc_bar2_offset = -entry->offset;
642 *rc_bar2_size = 1ULL << fls64(entry->res->end - entry->res->start);
643
644 /*
645 * We validate the inbound memory view even though we should trust
646 * whatever the device-tree provides. This is because of an HW issue on
647 * early Raspberry Pi 4's revisions (bcm2711). It turns out its
648 * firmware has to dynamically edit dma-ranges due to a bug on the
649 * PCIe controller integration, which prohibits any access above the
650 * lower 3GB of memory. Given this, we decided to keep the dma-ranges
651 * in check, avoiding hard to debug device-tree related issues in the
652 * future:
653 *
654 * The PCIe host controller by design must set the inbound viewport to
655 * be a contiguous arrangement of all of the system's memory. In
656 * addition, its size mut be a power of two. To further complicate
657 * matters, the viewport must start on a pcie-address that is aligned
658 * on a multiple of its size. If a portion of the viewport does not
659 * represent system memory -- e.g. 3GB of memory requires a 4GB
660 * viewport -- we can map the outbound memory in or after 3GB and even
661 * though the viewport will overlap the outbound memory the controller
662 * will know to send outbound memory downstream and everything else
663 * upstream.
664 *
665 * For example:
666 *
667 * - The best-case scenario, memory up to 3GB, is to place the inbound
668 * region in the first 4GB of pcie-space, as some legacy devices can
669 * only address 32bits. We would also like to put the MSI under 4GB
670 * as well, since some devices require a 32bit MSI target address.
671 *
672 * - If the system memory is 4GB or larger we cannot start the inbound
673 * region at location 0 (since we have to allow some space for
674 * outbound memory @ 3GB). So instead it will start at the 1x
675 * multiple of its size
676 */
677 if (!*rc_bar2_size || (*rc_bar2_offset & (*rc_bar2_size - 1)) ||
678 (*rc_bar2_offset < SZ_4G && *rc_bar2_offset > SZ_2G)) {
679 dev_err(dev, "Invalid rc_bar2_offset/size: size 0x%llx, off 0x%llx\n",
680 *rc_bar2_size, *rc_bar2_offset);
681 return -EINVAL;
682 }
683
684 return 0;
685}
686
687static int brcm_pcie_setup(struct brcm_pcie *pcie)
688{
689 struct pci_host_bridge *bridge = pci_host_bridge_from_priv(pcie);
690 u64 rc_bar2_offset, rc_bar2_size;
691 void __iomem *base = pcie->base;
692 struct device *dev = pcie->dev;
693 struct resource_entry *entry;
694 unsigned int scb_size_val;
695 bool ssc_good = false;
696 struct resource *res;
697 int num_out_wins = 0;
698 u16 nlw, cls, lnksta;
699 int i, ret;
700 u32 tmp, aspm_support;
701
702 /* Reset the bridge */
703 brcm_pcie_bridge_sw_init_set(pcie, 1);
704 brcm_pcie_perst_set(pcie, 1);
705
706 usleep_range(100, 200);
707
708 /* Take the bridge out of reset */
709 brcm_pcie_bridge_sw_init_set(pcie, 0);
710
711 tmp = readl(base + PCIE_MISC_HARD_PCIE_HARD_DEBUG);
712 tmp &= ~PCIE_MISC_HARD_PCIE_HARD_DEBUG_SERDES_IDDQ_MASK;
713 writel(tmp, base + PCIE_MISC_HARD_PCIE_HARD_DEBUG);
714 /* Wait for SerDes to be stable */
715 usleep_range(100, 200);
716
717 /* Set SCB_MAX_BURST_SIZE, CFG_READ_UR_MODE, SCB_ACCESS_EN */
718 u32p_replace_bits(&tmp, 1, PCIE_MISC_MISC_CTRL_SCB_ACCESS_EN_MASK);
719 u32p_replace_bits(&tmp, 1, PCIE_MISC_MISC_CTRL_CFG_READ_UR_MODE_MASK);
720 u32p_replace_bits(&tmp, PCIE_MISC_MISC_CTRL_MAX_BURST_SIZE_128,
721 PCIE_MISC_MISC_CTRL_MAX_BURST_SIZE_MASK);
722 writel(tmp, base + PCIE_MISC_MISC_CTRL);
723
724 ret = brcm_pcie_get_rc_bar2_size_and_offset(pcie, &rc_bar2_size,
725 &rc_bar2_offset);
726 if (ret)
727 return ret;
728
729 tmp = lower_32_bits(rc_bar2_offset);
730 u32p_replace_bits(&tmp, brcm_pcie_encode_ibar_size(rc_bar2_size),
731 PCIE_MISC_RC_BAR2_CONFIG_LO_SIZE_MASK);
732 writel(tmp, base + PCIE_MISC_RC_BAR2_CONFIG_LO);
733 writel(upper_32_bits(rc_bar2_offset),
734 base + PCIE_MISC_RC_BAR2_CONFIG_HI);
735
736 scb_size_val = rc_bar2_size ?
737 ilog2(rc_bar2_size) - 15 : 0xf; /* 0xf is 1GB */
738 tmp = readl(base + PCIE_MISC_MISC_CTRL);
739 u32p_replace_bits(&tmp, scb_size_val,
740 PCIE_MISC_MISC_CTRL_SCB0_SIZE_MASK);
741 writel(tmp, base + PCIE_MISC_MISC_CTRL);
742
743 /*
744 * We ideally want the MSI target address to be located in the 32bit
745 * addressable memory area. Some devices might depend on it. This is
746 * possible either when the inbound window is located above the lower
747 * 4GB or when the inbound area is smaller than 4GB (taking into
748 * account the rounding-up we're forced to perform).
749 */
750 if (rc_bar2_offset >= SZ_4G || (rc_bar2_size + rc_bar2_offset) < SZ_4G)
751 pcie->msi_target_addr = BRCM_MSI_TARGET_ADDR_LT_4GB;
752 else
753 pcie->msi_target_addr = BRCM_MSI_TARGET_ADDR_GT_4GB;
754
755 /* disable the PCIe->GISB memory window (RC_BAR1) */
756 tmp = readl(base + PCIE_MISC_RC_BAR1_CONFIG_LO);
757 tmp &= ~PCIE_MISC_RC_BAR1_CONFIG_LO_SIZE_MASK;
758 writel(tmp, base + PCIE_MISC_RC_BAR1_CONFIG_LO);
759
760 /* disable the PCIe->SCB memory window (RC_BAR3) */
761 tmp = readl(base + PCIE_MISC_RC_BAR3_CONFIG_LO);
762 tmp &= ~PCIE_MISC_RC_BAR3_CONFIG_LO_SIZE_MASK;
763 writel(tmp, base + PCIE_MISC_RC_BAR3_CONFIG_LO);
764
765 /* Mask all interrupts since we are not handling any yet */
766 writel(0xffffffff, pcie->base + PCIE_MSI_INTR2_MASK_SET);
767
768 /* clear any interrupts we find on boot */
769 writel(0xffffffff, pcie->base + PCIE_MSI_INTR2_CLR);
770
771 if (pcie->gen)
772 brcm_pcie_set_gen(pcie, pcie->gen);
773
774 /* Unassert the fundamental reset */
775 brcm_pcie_perst_set(pcie, 0);
776
777 /*
778 * Give the RC/EP time to wake up, before trying to configure RC.
779 * Intermittently check status for link-up, up to a total of 100ms.
780 */
781 for (i = 0; i < 100 && !brcm_pcie_link_up(pcie); i += 5)
782 msleep(5);
783
784 if (!brcm_pcie_link_up(pcie)) {
785 dev_err(dev, "link down\n");
786 return -ENODEV;
787 }
788
789 if (!brcm_pcie_rc_mode(pcie)) {
790 dev_err(dev, "PCIe misconfigured; is in EP mode\n");
791 return -EINVAL;
792 }
793
794 resource_list_for_each_entry(entry, &bridge->windows) {
795 res = entry->res;
796
797 if (resource_type(res) != IORESOURCE_MEM)
798 continue;
799
800 if (num_out_wins >= BRCM_NUM_PCIE_OUT_WINS) {
801 dev_err(pcie->dev, "too many outbound wins\n");
802 return -EINVAL;
803 }
804
805 brcm_pcie_set_outbound_win(pcie, num_out_wins, res->start,
806 res->start - entry->offset,
807 resource_size(res));
808 num_out_wins++;
809 }
810
811 /* Don't advertise L0s capability if 'aspm-no-l0s' */
812 aspm_support = PCIE_LINK_STATE_L1;
813 if (!of_property_read_bool(pcie->np, "aspm-no-l0s"))
814 aspm_support |= PCIE_LINK_STATE_L0S;
815 tmp = readl(base + PCIE_RC_CFG_PRIV1_LINK_CAPABILITY);
816 u32p_replace_bits(&tmp, aspm_support,
817 PCIE_RC_CFG_PRIV1_LINK_CAPABILITY_ASPM_SUPPORT_MASK);
818 writel(tmp, base + PCIE_RC_CFG_PRIV1_LINK_CAPABILITY);
819
820 /*
821 * For config space accesses on the RC, show the right class for
822 * a PCIe-PCIe bridge (the default setting is to be EP mode).
823 */
824 tmp = readl(base + PCIE_RC_CFG_PRIV1_ID_VAL3);
825 u32p_replace_bits(&tmp, 0x060400,
826 PCIE_RC_CFG_PRIV1_ID_VAL3_CLASS_CODE_MASK);
827 writel(tmp, base + PCIE_RC_CFG_PRIV1_ID_VAL3);
828
829 if (pcie->ssc) {
830 ret = brcm_pcie_set_ssc(pcie);
831 if (ret == 0)
832 ssc_good = true;
833 else
834 dev_err(dev, "failed attempt to enter ssc mode\n");
835 }
836
837 lnksta = readw(base + BRCM_PCIE_CAP_REGS + PCI_EXP_LNKSTA);
838 cls = FIELD_GET(PCI_EXP_LNKSTA_CLS, lnksta);
839 nlw = FIELD_GET(PCI_EXP_LNKSTA_NLW, lnksta);
840 dev_info(dev, "link up, %s x%u %s\n",
841 pci_speed_string(pcie_link_speed[cls]), nlw,
842 ssc_good ? "(SSC)" : "(!SSC)");
843
844 /* PCIe->SCB endian mode for BAR */
845 tmp = readl(base + PCIE_RC_CFG_VENDOR_VENDOR_SPECIFIC_REG1);
846 u32p_replace_bits(&tmp, PCIE_RC_CFG_VENDOR_SPCIFIC_REG1_LITTLE_ENDIAN,
847 PCIE_RC_CFG_VENDOR_VENDOR_SPECIFIC_REG1_ENDIAN_MODE_BAR2_MASK);
848 writel(tmp, base + PCIE_RC_CFG_VENDOR_VENDOR_SPECIFIC_REG1);
849
850 /*
851 * Refclk from RC should be gated with CLKREQ# input when ASPM L0s,L1
852 * is enabled => setting the CLKREQ_DEBUG_ENABLE field to 1.
853 */
854 tmp = readl(base + PCIE_MISC_HARD_PCIE_HARD_DEBUG);
855 tmp |= PCIE_MISC_HARD_PCIE_HARD_DEBUG_CLKREQ_DEBUG_ENABLE_MASK;
856 writel(tmp, base + PCIE_MISC_HARD_PCIE_HARD_DEBUG);
857
858 return 0;
859}
860
861/* L23 is a low-power PCIe link state */
862static void brcm_pcie_enter_l23(struct brcm_pcie *pcie)
863{
864 void __iomem *base = pcie->base;
865 int l23, i;
866 u32 tmp;
867
868 /* Assert request for L23 */
869 tmp = readl(base + PCIE_MISC_PCIE_CTRL);
870 u32p_replace_bits(&tmp, 1, PCIE_MISC_PCIE_CTRL_PCIE_L23_REQUEST_MASK);
871 writel(tmp, base + PCIE_MISC_PCIE_CTRL);
872
873 /* Wait up to 36 msec for L23 */
874 tmp = readl(base + PCIE_MISC_PCIE_STATUS);
875 l23 = FIELD_GET(PCIE_MISC_PCIE_STATUS_PCIE_LINK_IN_L23_MASK, tmp);
876 for (i = 0; i < 15 && !l23; i++) {
877 usleep_range(2000, 2400);
878 tmp = readl(base + PCIE_MISC_PCIE_STATUS);
879 l23 = FIELD_GET(PCIE_MISC_PCIE_STATUS_PCIE_LINK_IN_L23_MASK,
880 tmp);
881 }
882
883 if (!l23)
884 dev_err(pcie->dev, "failed to enter low-power link state\n");
885}
886
887static void brcm_pcie_turn_off(struct brcm_pcie *pcie)
888{
889 void __iomem *base = pcie->base;
890 int tmp;
891
892 if (brcm_pcie_link_up(pcie))
893 brcm_pcie_enter_l23(pcie);
894 /* Assert fundamental reset */
895 brcm_pcie_perst_set(pcie, 1);
896
897 /* Deassert request for L23 in case it was asserted */
898 tmp = readl(base + PCIE_MISC_PCIE_CTRL);
899 u32p_replace_bits(&tmp, 0, PCIE_MISC_PCIE_CTRL_PCIE_L23_REQUEST_MASK);
900 writel(tmp, base + PCIE_MISC_PCIE_CTRL);
901
902 /* Turn off SerDes */
903 tmp = readl(base + PCIE_MISC_HARD_PCIE_HARD_DEBUG);
904 u32p_replace_bits(&tmp, 1, PCIE_MISC_HARD_PCIE_HARD_DEBUG_SERDES_IDDQ_MASK);
905 writel(tmp, base + PCIE_MISC_HARD_PCIE_HARD_DEBUG);
906
907 /* Shutdown PCIe bridge */
908 brcm_pcie_bridge_sw_init_set(pcie, 1);
909}
910
911static void __brcm_pcie_remove(struct brcm_pcie *pcie)
912{
913 brcm_msi_remove(pcie);
914 brcm_pcie_turn_off(pcie);
915 clk_disable_unprepare(pcie->clk);
916}
917
918static int brcm_pcie_remove(struct platform_device *pdev)
919{
920 struct brcm_pcie *pcie = platform_get_drvdata(pdev);
921 struct pci_host_bridge *bridge = pci_host_bridge_from_priv(pcie);
922
923 pci_stop_root_bus(bridge->bus);
924 pci_remove_root_bus(bridge->bus);
925 __brcm_pcie_remove(pcie);
926
927 return 0;
928}
929
930static int brcm_pcie_probe(struct platform_device *pdev)
931{
932 struct device_node *np = pdev->dev.of_node, *msi_np;
933 struct pci_host_bridge *bridge;
934 struct device_node *fw_np;
935 struct brcm_pcie *pcie;
936 int ret;
937
938 /*
939 * We have to wait for Raspberry Pi's firmware interface to be up as a
940 * PCI fixup, rpi_firmware_init_vl805(), depends on it. This driver's
941 * probe can race with the firmware interface's (see
942 * drivers/firmware/raspberrypi.c) and potentially break the PCI fixup.
943 */
944 fw_np = of_find_compatible_node(NULL, NULL,
945 "raspberrypi,bcm2835-firmware");
946 if (fw_np && !rpi_firmware_get(fw_np)) {
947 of_node_put(fw_np);
948 return -EPROBE_DEFER;
949 }
950 of_node_put(fw_np);
951
952 bridge = devm_pci_alloc_host_bridge(&pdev->dev, sizeof(*pcie));
953 if (!bridge)
954 return -ENOMEM;
955
956 pcie = pci_host_bridge_priv(bridge);
957 pcie->dev = &pdev->dev;
958 pcie->np = np;
959
960 pcie->base = devm_platform_ioremap_resource(pdev, 0);
961 if (IS_ERR(pcie->base))
962 return PTR_ERR(pcie->base);
963
964 pcie->clk = devm_clk_get_optional(&pdev->dev, "sw_pcie");
965 if (IS_ERR(pcie->clk))
966 return PTR_ERR(pcie->clk);
967
968 ret = of_pci_get_max_link_speed(np);
969 pcie->gen = (ret < 0) ? 0 : ret;
970
971 pcie->ssc = of_property_read_bool(np, "brcm,enable-ssc");
972
973 ret = clk_prepare_enable(pcie->clk);
974 if (ret) {
975 dev_err(&pdev->dev, "could not enable clock\n");
976 return ret;
977 }
978
979 ret = brcm_pcie_setup(pcie);
980 if (ret)
981 goto fail;
982
983 msi_np = of_parse_phandle(pcie->np, "msi-parent", 0);
984 if (pci_msi_enabled() && msi_np == pcie->np) {
985 ret = brcm_pcie_enable_msi(pcie);
986 if (ret) {
987 dev_err(pcie->dev, "probe of internal MSI failed");
988 goto fail;
989 }
990 }
991
992 bridge->ops = &brcm_pcie_ops;
993 bridge->sysdata = pcie;
994
995 platform_set_drvdata(pdev, pcie);
996
997 return pci_host_probe(bridge);
998fail:
999 __brcm_pcie_remove(pcie);
1000 return ret;
1001}
1002
1003static const struct of_device_id brcm_pcie_match[] = {
1004 { .compatible = "brcm,bcm2711-pcie" },
1005 {},
1006};
1007MODULE_DEVICE_TABLE(of, brcm_pcie_match);
1008
1009static struct platform_driver brcm_pcie_driver = {
1010 .probe = brcm_pcie_probe,
1011 .remove = brcm_pcie_remove,
1012 .driver = {
1013 .name = "brcm-pcie",
1014 .of_match_table = brcm_pcie_match,
1015 },
1016};
1017module_platform_driver(brcm_pcie_driver);
1018
1019MODULE_LICENSE("GPL");
1020MODULE_DESCRIPTION("Broadcom STB PCIe RC driver");
1021MODULE_AUTHOR("Broadcom");
1// SPDX-License-Identifier: GPL-2.0+
2/* Copyright (C) 2009 - 2019 Broadcom */
3
4#include <linux/bitfield.h>
5#include <linux/bitops.h>
6#include <linux/clk.h>
7#include <linux/compiler.h>
8#include <linux/delay.h>
9#include <linux/init.h>
10#include <linux/interrupt.h>
11#include <linux/io.h>
12#include <linux/iopoll.h>
13#include <linux/ioport.h>
14#include <linux/irqchip/chained_irq.h>
15#include <linux/irqdomain.h>
16#include <linux/kernel.h>
17#include <linux/list.h>
18#include <linux/log2.h>
19#include <linux/module.h>
20#include <linux/msi.h>
21#include <linux/of_address.h>
22#include <linux/of_irq.h>
23#include <linux/of_pci.h>
24#include <linux/of_platform.h>
25#include <linux/pci.h>
26#include <linux/pci-ecam.h>
27#include <linux/printk.h>
28#include <linux/regulator/consumer.h>
29#include <linux/reset.h>
30#include <linux/sizes.h>
31#include <linux/slab.h>
32#include <linux/string.h>
33#include <linux/types.h>
34
35#include "../pci.h"
36
37/* BRCM_PCIE_CAP_REGS - Offset for the mandatory capability config regs */
38#define BRCM_PCIE_CAP_REGS 0x00ac
39
40/* Broadcom STB PCIe Register Offsets */
41#define PCIE_RC_CFG_VENDOR_VENDOR_SPECIFIC_REG1 0x0188
42#define PCIE_RC_CFG_VENDOR_VENDOR_SPECIFIC_REG1_ENDIAN_MODE_BAR2_MASK 0xc
43#define PCIE_RC_CFG_VENDOR_SPCIFIC_REG1_LITTLE_ENDIAN 0x0
44
45#define PCIE_RC_CFG_PRIV1_ID_VAL3 0x043c
46#define PCIE_RC_CFG_PRIV1_ID_VAL3_CLASS_CODE_MASK 0xffffff
47
48#define PCIE_RC_CFG_PRIV1_LINK_CAPABILITY 0x04dc
49#define PCIE_RC_CFG_PRIV1_LINK_CAPABILITY_ASPM_SUPPORT_MASK 0xc00
50
51#define PCIE_RC_DL_MDIO_ADDR 0x1100
52#define PCIE_RC_DL_MDIO_WR_DATA 0x1104
53#define PCIE_RC_DL_MDIO_RD_DATA 0x1108
54
55#define PCIE_MISC_MISC_CTRL 0x4008
56#define PCIE_MISC_MISC_CTRL_PCIE_RCB_64B_MODE_MASK 0x80
57#define PCIE_MISC_MISC_CTRL_PCIE_RCB_MPS_MODE_MASK 0x400
58#define PCIE_MISC_MISC_CTRL_SCB_ACCESS_EN_MASK 0x1000
59#define PCIE_MISC_MISC_CTRL_CFG_READ_UR_MODE_MASK 0x2000
60#define PCIE_MISC_MISC_CTRL_MAX_BURST_SIZE_MASK 0x300000
61
62#define PCIE_MISC_MISC_CTRL_SCB0_SIZE_MASK 0xf8000000
63#define PCIE_MISC_MISC_CTRL_SCB1_SIZE_MASK 0x07c00000
64#define PCIE_MISC_MISC_CTRL_SCB2_SIZE_MASK 0x0000001f
65#define SCB_SIZE_MASK(x) PCIE_MISC_MISC_CTRL_SCB ## x ## _SIZE_MASK
66
67#define PCIE_MISC_CPU_2_PCIE_MEM_WIN0_LO 0x400c
68#define PCIE_MEM_WIN0_LO(win) \
69 PCIE_MISC_CPU_2_PCIE_MEM_WIN0_LO + ((win) * 8)
70
71#define PCIE_MISC_CPU_2_PCIE_MEM_WIN0_HI 0x4010
72#define PCIE_MEM_WIN0_HI(win) \
73 PCIE_MISC_CPU_2_PCIE_MEM_WIN0_HI + ((win) * 8)
74
75#define PCIE_MISC_RC_BAR1_CONFIG_LO 0x402c
76#define PCIE_MISC_RC_BAR1_CONFIG_LO_SIZE_MASK 0x1f
77
78#define PCIE_MISC_RC_BAR2_CONFIG_LO 0x4034
79#define PCIE_MISC_RC_BAR2_CONFIG_LO_SIZE_MASK 0x1f
80#define PCIE_MISC_RC_BAR2_CONFIG_HI 0x4038
81
82#define PCIE_MISC_RC_BAR3_CONFIG_LO 0x403c
83#define PCIE_MISC_RC_BAR3_CONFIG_LO_SIZE_MASK 0x1f
84
85#define PCIE_MISC_MSI_BAR_CONFIG_LO 0x4044
86#define PCIE_MISC_MSI_BAR_CONFIG_HI 0x4048
87
88#define PCIE_MISC_MSI_DATA_CONFIG 0x404c
89#define PCIE_MISC_MSI_DATA_CONFIG_VAL_32 0xffe06540
90#define PCIE_MISC_MSI_DATA_CONFIG_VAL_8 0xfff86540
91
92#define PCIE_MISC_PCIE_CTRL 0x4064
93#define PCIE_MISC_PCIE_CTRL_PCIE_L23_REQUEST_MASK 0x1
94#define PCIE_MISC_PCIE_CTRL_PCIE_PERSTB_MASK 0x4
95
96#define PCIE_MISC_PCIE_STATUS 0x4068
97#define PCIE_MISC_PCIE_STATUS_PCIE_PORT_MASK 0x80
98#define PCIE_MISC_PCIE_STATUS_PCIE_DL_ACTIVE_MASK 0x20
99#define PCIE_MISC_PCIE_STATUS_PCIE_PHYLINKUP_MASK 0x10
100#define PCIE_MISC_PCIE_STATUS_PCIE_LINK_IN_L23_MASK 0x40
101
102#define PCIE_MISC_REVISION 0x406c
103#define BRCM_PCIE_HW_REV_33 0x0303
104#define BRCM_PCIE_HW_REV_3_20 0x0320
105
106#define PCIE_MISC_CPU_2_PCIE_MEM_WIN0_BASE_LIMIT 0x4070
107#define PCIE_MISC_CPU_2_PCIE_MEM_WIN0_BASE_LIMIT_LIMIT_MASK 0xfff00000
108#define PCIE_MISC_CPU_2_PCIE_MEM_WIN0_BASE_LIMIT_BASE_MASK 0xfff0
109#define PCIE_MEM_WIN0_BASE_LIMIT(win) \
110 PCIE_MISC_CPU_2_PCIE_MEM_WIN0_BASE_LIMIT + ((win) * 4)
111
112#define PCIE_MISC_CPU_2_PCIE_MEM_WIN0_BASE_HI 0x4080
113#define PCIE_MISC_CPU_2_PCIE_MEM_WIN0_BASE_HI_BASE_MASK 0xff
114#define PCIE_MEM_WIN0_BASE_HI(win) \
115 PCIE_MISC_CPU_2_PCIE_MEM_WIN0_BASE_HI + ((win) * 8)
116
117#define PCIE_MISC_CPU_2_PCIE_MEM_WIN0_LIMIT_HI 0x4084
118#define PCIE_MISC_CPU_2_PCIE_MEM_WIN0_LIMIT_HI_LIMIT_MASK 0xff
119#define PCIE_MEM_WIN0_LIMIT_HI(win) \
120 PCIE_MISC_CPU_2_PCIE_MEM_WIN0_LIMIT_HI + ((win) * 8)
121
122#define PCIE_MISC_HARD_PCIE_HARD_DEBUG 0x4204
123#define PCIE_MISC_HARD_PCIE_HARD_DEBUG_CLKREQ_DEBUG_ENABLE_MASK 0x2
124#define PCIE_MISC_HARD_PCIE_HARD_DEBUG_SERDES_IDDQ_MASK 0x08000000
125#define PCIE_BMIPS_MISC_HARD_PCIE_HARD_DEBUG_SERDES_IDDQ_MASK 0x00800000
126
127
128#define PCIE_INTR2_CPU_BASE 0x4300
129#define PCIE_MSI_INTR2_BASE 0x4500
130/* Offsets from PCIE_INTR2_CPU_BASE and PCIE_MSI_INTR2_BASE */
131#define MSI_INT_STATUS 0x0
132#define MSI_INT_CLR 0x8
133#define MSI_INT_MASK_SET 0x10
134#define MSI_INT_MASK_CLR 0x14
135
136#define PCIE_EXT_CFG_DATA 0x8000
137#define PCIE_EXT_CFG_INDEX 0x9000
138
139#define PCIE_RGR1_SW_INIT_1_PERST_MASK 0x1
140#define PCIE_RGR1_SW_INIT_1_PERST_SHIFT 0x0
141
142#define RGR1_SW_INIT_1_INIT_GENERIC_MASK 0x2
143#define RGR1_SW_INIT_1_INIT_GENERIC_SHIFT 0x1
144#define RGR1_SW_INIT_1_INIT_7278_MASK 0x1
145#define RGR1_SW_INIT_1_INIT_7278_SHIFT 0x0
146
147/* PCIe parameters */
148#define BRCM_NUM_PCIE_OUT_WINS 0x4
149#define BRCM_INT_PCI_MSI_NR 32
150#define BRCM_INT_PCI_MSI_LEGACY_NR 8
151#define BRCM_INT_PCI_MSI_SHIFT 0
152#define BRCM_INT_PCI_MSI_MASK GENMASK(BRCM_INT_PCI_MSI_NR - 1, 0)
153#define BRCM_INT_PCI_MSI_LEGACY_MASK GENMASK(31, \
154 32 - BRCM_INT_PCI_MSI_LEGACY_NR)
155
156/* MSI target addresses */
157#define BRCM_MSI_TARGET_ADDR_LT_4GB 0x0fffffffcULL
158#define BRCM_MSI_TARGET_ADDR_GT_4GB 0xffffffffcULL
159
160/* MDIO registers */
161#define MDIO_PORT0 0x0
162#define MDIO_DATA_MASK 0x7fffffff
163#define MDIO_PORT_MASK 0xf0000
164#define MDIO_REGAD_MASK 0xffff
165#define MDIO_CMD_MASK 0xfff00000
166#define MDIO_CMD_READ 0x1
167#define MDIO_CMD_WRITE 0x0
168#define MDIO_DATA_DONE_MASK 0x80000000
169#define MDIO_RD_DONE(x) (((x) & MDIO_DATA_DONE_MASK) ? 1 : 0)
170#define MDIO_WT_DONE(x) (((x) & MDIO_DATA_DONE_MASK) ? 0 : 1)
171#define SSC_REGS_ADDR 0x1100
172#define SET_ADDR_OFFSET 0x1f
173#define SSC_CNTL_OFFSET 0x2
174#define SSC_CNTL_OVRD_EN_MASK 0x8000
175#define SSC_CNTL_OVRD_VAL_MASK 0x4000
176#define SSC_STATUS_OFFSET 0x1
177#define SSC_STATUS_SSC_MASK 0x400
178#define SSC_STATUS_PLL_LOCK_MASK 0x800
179#define PCIE_BRCM_MAX_MEMC 3
180
181#define IDX_ADDR(pcie) (pcie->reg_offsets[EXT_CFG_INDEX])
182#define DATA_ADDR(pcie) (pcie->reg_offsets[EXT_CFG_DATA])
183#define PCIE_RGR1_SW_INIT_1(pcie) (pcie->reg_offsets[RGR1_SW_INIT_1])
184
185/* Rescal registers */
186#define PCIE_DVT_PMU_PCIE_PHY_CTRL 0xc700
187#define PCIE_DVT_PMU_PCIE_PHY_CTRL_DAST_NFLDS 0x3
188#define PCIE_DVT_PMU_PCIE_PHY_CTRL_DAST_DIG_RESET_MASK 0x4
189#define PCIE_DVT_PMU_PCIE_PHY_CTRL_DAST_DIG_RESET_SHIFT 0x2
190#define PCIE_DVT_PMU_PCIE_PHY_CTRL_DAST_RESET_MASK 0x2
191#define PCIE_DVT_PMU_PCIE_PHY_CTRL_DAST_RESET_SHIFT 0x1
192#define PCIE_DVT_PMU_PCIE_PHY_CTRL_DAST_PWRDN_MASK 0x1
193#define PCIE_DVT_PMU_PCIE_PHY_CTRL_DAST_PWRDN_SHIFT 0x0
194
195/* Forward declarations */
196struct brcm_pcie;
197
198enum {
199 RGR1_SW_INIT_1,
200 EXT_CFG_INDEX,
201 EXT_CFG_DATA,
202};
203
204enum {
205 RGR1_SW_INIT_1_INIT_MASK,
206 RGR1_SW_INIT_1_INIT_SHIFT,
207};
208
209enum pcie_type {
210 GENERIC,
211 BCM7425,
212 BCM7435,
213 BCM4908,
214 BCM7278,
215 BCM2711,
216};
217
218struct pcie_cfg_data {
219 const int *offsets;
220 const enum pcie_type type;
221 void (*perst_set)(struct brcm_pcie *pcie, u32 val);
222 void (*bridge_sw_init_set)(struct brcm_pcie *pcie, u32 val);
223};
224
225struct subdev_regulators {
226 unsigned int num_supplies;
227 struct regulator_bulk_data supplies[];
228};
229
230struct brcm_msi {
231 struct device *dev;
232 void __iomem *base;
233 struct device_node *np;
234 struct irq_domain *msi_domain;
235 struct irq_domain *inner_domain;
236 struct mutex lock; /* guards the alloc/free operations */
237 u64 target_addr;
238 int irq;
239 DECLARE_BITMAP(used, BRCM_INT_PCI_MSI_NR);
240 bool legacy;
241 /* Some chips have MSIs in bits [31..24] of a shared register. */
242 int legacy_shift;
243 int nr; /* No. of MSI available, depends on chip */
244 /* This is the base pointer for interrupt status/set/clr regs */
245 void __iomem *intr_base;
246};
247
248/* Internal PCIe Host Controller Information.*/
249struct brcm_pcie {
250 struct device *dev;
251 void __iomem *base;
252 struct clk *clk;
253 struct device_node *np;
254 bool ssc;
255 int gen;
256 u64 msi_target_addr;
257 struct brcm_msi *msi;
258 const int *reg_offsets;
259 enum pcie_type type;
260 struct reset_control *rescal;
261 struct reset_control *perst_reset;
262 int num_memc;
263 u64 memc_size[PCIE_BRCM_MAX_MEMC];
264 u32 hw_rev;
265 void (*perst_set)(struct brcm_pcie *pcie, u32 val);
266 void (*bridge_sw_init_set)(struct brcm_pcie *pcie, u32 val);
267 struct subdev_regulators *sr;
268 bool ep_wakeup_capable;
269};
270
271static inline bool is_bmips(const struct brcm_pcie *pcie)
272{
273 return pcie->type == BCM7435 || pcie->type == BCM7425;
274}
275
276/*
277 * This is to convert the size of the inbound "BAR" region to the
278 * non-linear values of PCIE_X_MISC_RC_BAR[123]_CONFIG_LO.SIZE
279 */
280static int brcm_pcie_encode_ibar_size(u64 size)
281{
282 int log2_in = ilog2(size);
283
284 if (log2_in >= 12 && log2_in <= 15)
285 /* Covers 4KB to 32KB (inclusive) */
286 return (log2_in - 12) + 0x1c;
287 else if (log2_in >= 16 && log2_in <= 35)
288 /* Covers 64KB to 32GB, (inclusive) */
289 return log2_in - 15;
290 /* Something is awry so disable */
291 return 0;
292}
293
294static u32 brcm_pcie_mdio_form_pkt(int port, int regad, int cmd)
295{
296 u32 pkt = 0;
297
298 pkt |= FIELD_PREP(MDIO_PORT_MASK, port);
299 pkt |= FIELD_PREP(MDIO_REGAD_MASK, regad);
300 pkt |= FIELD_PREP(MDIO_CMD_MASK, cmd);
301
302 return pkt;
303}
304
305/* negative return value indicates error */
306static int brcm_pcie_mdio_read(void __iomem *base, u8 port, u8 regad, u32 *val)
307{
308 u32 data;
309 int err;
310
311 writel(brcm_pcie_mdio_form_pkt(port, regad, MDIO_CMD_READ),
312 base + PCIE_RC_DL_MDIO_ADDR);
313 readl(base + PCIE_RC_DL_MDIO_ADDR);
314 err = readl_poll_timeout_atomic(base + PCIE_RC_DL_MDIO_RD_DATA, data,
315 MDIO_RD_DONE(data), 10, 100);
316 *val = FIELD_GET(MDIO_DATA_MASK, data);
317
318 return err;
319}
320
321/* negative return value indicates error */
322static int brcm_pcie_mdio_write(void __iomem *base, u8 port,
323 u8 regad, u16 wrdata)
324{
325 u32 data;
326 int err;
327
328 writel(brcm_pcie_mdio_form_pkt(port, regad, MDIO_CMD_WRITE),
329 base + PCIE_RC_DL_MDIO_ADDR);
330 readl(base + PCIE_RC_DL_MDIO_ADDR);
331 writel(MDIO_DATA_DONE_MASK | wrdata, base + PCIE_RC_DL_MDIO_WR_DATA);
332
333 err = readw_poll_timeout_atomic(base + PCIE_RC_DL_MDIO_WR_DATA, data,
334 MDIO_WT_DONE(data), 10, 100);
335 return err;
336}
337
338/*
339 * Configures device for Spread Spectrum Clocking (SSC) mode; a negative
340 * return value indicates error.
341 */
342static int brcm_pcie_set_ssc(struct brcm_pcie *pcie)
343{
344 int pll, ssc;
345 int ret;
346 u32 tmp;
347
348 ret = brcm_pcie_mdio_write(pcie->base, MDIO_PORT0, SET_ADDR_OFFSET,
349 SSC_REGS_ADDR);
350 if (ret < 0)
351 return ret;
352
353 ret = brcm_pcie_mdio_read(pcie->base, MDIO_PORT0,
354 SSC_CNTL_OFFSET, &tmp);
355 if (ret < 0)
356 return ret;
357
358 u32p_replace_bits(&tmp, 1, SSC_CNTL_OVRD_EN_MASK);
359 u32p_replace_bits(&tmp, 1, SSC_CNTL_OVRD_VAL_MASK);
360 ret = brcm_pcie_mdio_write(pcie->base, MDIO_PORT0,
361 SSC_CNTL_OFFSET, tmp);
362 if (ret < 0)
363 return ret;
364
365 usleep_range(1000, 2000);
366 ret = brcm_pcie_mdio_read(pcie->base, MDIO_PORT0,
367 SSC_STATUS_OFFSET, &tmp);
368 if (ret < 0)
369 return ret;
370
371 ssc = FIELD_GET(SSC_STATUS_SSC_MASK, tmp);
372 pll = FIELD_GET(SSC_STATUS_PLL_LOCK_MASK, tmp);
373
374 return ssc && pll ? 0 : -EIO;
375}
376
377/* Limits operation to a specific generation (1, 2, or 3) */
378static void brcm_pcie_set_gen(struct brcm_pcie *pcie, int gen)
379{
380 u16 lnkctl2 = readw(pcie->base + BRCM_PCIE_CAP_REGS + PCI_EXP_LNKCTL2);
381 u32 lnkcap = readl(pcie->base + BRCM_PCIE_CAP_REGS + PCI_EXP_LNKCAP);
382
383 lnkcap = (lnkcap & ~PCI_EXP_LNKCAP_SLS) | gen;
384 writel(lnkcap, pcie->base + BRCM_PCIE_CAP_REGS + PCI_EXP_LNKCAP);
385
386 lnkctl2 = (lnkctl2 & ~0xf) | gen;
387 writew(lnkctl2, pcie->base + BRCM_PCIE_CAP_REGS + PCI_EXP_LNKCTL2);
388}
389
390static void brcm_pcie_set_outbound_win(struct brcm_pcie *pcie,
391 unsigned int win, u64 cpu_addr,
392 u64 pcie_addr, u64 size)
393{
394 u32 cpu_addr_mb_high, limit_addr_mb_high;
395 phys_addr_t cpu_addr_mb, limit_addr_mb;
396 int high_addr_shift;
397 u32 tmp;
398
399 /* Set the base of the pcie_addr window */
400 writel(lower_32_bits(pcie_addr), pcie->base + PCIE_MEM_WIN0_LO(win));
401 writel(upper_32_bits(pcie_addr), pcie->base + PCIE_MEM_WIN0_HI(win));
402
403 /* Write the addr base & limit lower bits (in MBs) */
404 cpu_addr_mb = cpu_addr / SZ_1M;
405 limit_addr_mb = (cpu_addr + size - 1) / SZ_1M;
406
407 tmp = readl(pcie->base + PCIE_MEM_WIN0_BASE_LIMIT(win));
408 u32p_replace_bits(&tmp, cpu_addr_mb,
409 PCIE_MISC_CPU_2_PCIE_MEM_WIN0_BASE_LIMIT_BASE_MASK);
410 u32p_replace_bits(&tmp, limit_addr_mb,
411 PCIE_MISC_CPU_2_PCIE_MEM_WIN0_BASE_LIMIT_LIMIT_MASK);
412 writel(tmp, pcie->base + PCIE_MEM_WIN0_BASE_LIMIT(win));
413
414 if (is_bmips(pcie))
415 return;
416
417 /* Write the cpu & limit addr upper bits */
418 high_addr_shift =
419 HWEIGHT32(PCIE_MISC_CPU_2_PCIE_MEM_WIN0_BASE_LIMIT_BASE_MASK);
420
421 cpu_addr_mb_high = cpu_addr_mb >> high_addr_shift;
422 tmp = readl(pcie->base + PCIE_MEM_WIN0_BASE_HI(win));
423 u32p_replace_bits(&tmp, cpu_addr_mb_high,
424 PCIE_MISC_CPU_2_PCIE_MEM_WIN0_BASE_HI_BASE_MASK);
425 writel(tmp, pcie->base + PCIE_MEM_WIN0_BASE_HI(win));
426
427 limit_addr_mb_high = limit_addr_mb >> high_addr_shift;
428 tmp = readl(pcie->base + PCIE_MEM_WIN0_LIMIT_HI(win));
429 u32p_replace_bits(&tmp, limit_addr_mb_high,
430 PCIE_MISC_CPU_2_PCIE_MEM_WIN0_LIMIT_HI_LIMIT_MASK);
431 writel(tmp, pcie->base + PCIE_MEM_WIN0_LIMIT_HI(win));
432}
433
434static struct irq_chip brcm_msi_irq_chip = {
435 .name = "BRCM STB PCIe MSI",
436 .irq_ack = irq_chip_ack_parent,
437 .irq_mask = pci_msi_mask_irq,
438 .irq_unmask = pci_msi_unmask_irq,
439};
440
441static struct msi_domain_info brcm_msi_domain_info = {
442 /* Multi MSI is supported by the controller, but not by this driver */
443 .flags = (MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS |
444 MSI_FLAG_MULTI_PCI_MSI),
445 .chip = &brcm_msi_irq_chip,
446};
447
448static void brcm_pcie_msi_isr(struct irq_desc *desc)
449{
450 struct irq_chip *chip = irq_desc_get_chip(desc);
451 unsigned long status;
452 struct brcm_msi *msi;
453 struct device *dev;
454 u32 bit;
455
456 chained_irq_enter(chip, desc);
457 msi = irq_desc_get_handler_data(desc);
458 dev = msi->dev;
459
460 status = readl(msi->intr_base + MSI_INT_STATUS);
461 status >>= msi->legacy_shift;
462
463 for_each_set_bit(bit, &status, msi->nr) {
464 int ret;
465 ret = generic_handle_domain_irq(msi->inner_domain, bit);
466 if (ret)
467 dev_dbg(dev, "unexpected MSI\n");
468 }
469
470 chained_irq_exit(chip, desc);
471}
472
473static void brcm_msi_compose_msi_msg(struct irq_data *data, struct msi_msg *msg)
474{
475 struct brcm_msi *msi = irq_data_get_irq_chip_data(data);
476
477 msg->address_lo = lower_32_bits(msi->target_addr);
478 msg->address_hi = upper_32_bits(msi->target_addr);
479 msg->data = (0xffff & PCIE_MISC_MSI_DATA_CONFIG_VAL_32) | data->hwirq;
480}
481
482static int brcm_msi_set_affinity(struct irq_data *irq_data,
483 const struct cpumask *mask, bool force)
484{
485 return -EINVAL;
486}
487
488static void brcm_msi_ack_irq(struct irq_data *data)
489{
490 struct brcm_msi *msi = irq_data_get_irq_chip_data(data);
491 const int shift_amt = data->hwirq + msi->legacy_shift;
492
493 writel(1 << shift_amt, msi->intr_base + MSI_INT_CLR);
494}
495
496
497static struct irq_chip brcm_msi_bottom_irq_chip = {
498 .name = "BRCM STB MSI",
499 .irq_compose_msi_msg = brcm_msi_compose_msi_msg,
500 .irq_set_affinity = brcm_msi_set_affinity,
501 .irq_ack = brcm_msi_ack_irq,
502};
503
504static int brcm_msi_alloc(struct brcm_msi *msi, unsigned int nr_irqs)
505{
506 int hwirq;
507
508 mutex_lock(&msi->lock);
509 hwirq = bitmap_find_free_region(msi->used, msi->nr,
510 order_base_2(nr_irqs));
511 mutex_unlock(&msi->lock);
512
513 return hwirq;
514}
515
516static void brcm_msi_free(struct brcm_msi *msi, unsigned long hwirq,
517 unsigned int nr_irqs)
518{
519 mutex_lock(&msi->lock);
520 bitmap_release_region(msi->used, hwirq, order_base_2(nr_irqs));
521 mutex_unlock(&msi->lock);
522}
523
524static int brcm_irq_domain_alloc(struct irq_domain *domain, unsigned int virq,
525 unsigned int nr_irqs, void *args)
526{
527 struct brcm_msi *msi = domain->host_data;
528 int hwirq, i;
529
530 hwirq = brcm_msi_alloc(msi, nr_irqs);
531
532 if (hwirq < 0)
533 return hwirq;
534
535 for (i = 0; i < nr_irqs; i++)
536 irq_domain_set_info(domain, virq + i, hwirq + i,
537 &brcm_msi_bottom_irq_chip, domain->host_data,
538 handle_edge_irq, NULL, NULL);
539 return 0;
540}
541
542static void brcm_irq_domain_free(struct irq_domain *domain,
543 unsigned int virq, unsigned int nr_irqs)
544{
545 struct irq_data *d = irq_domain_get_irq_data(domain, virq);
546 struct brcm_msi *msi = irq_data_get_irq_chip_data(d);
547
548 brcm_msi_free(msi, d->hwirq, nr_irqs);
549}
550
551static const struct irq_domain_ops msi_domain_ops = {
552 .alloc = brcm_irq_domain_alloc,
553 .free = brcm_irq_domain_free,
554};
555
556static int brcm_allocate_domains(struct brcm_msi *msi)
557{
558 struct fwnode_handle *fwnode = of_node_to_fwnode(msi->np);
559 struct device *dev = msi->dev;
560
561 msi->inner_domain = irq_domain_add_linear(NULL, msi->nr, &msi_domain_ops, msi);
562 if (!msi->inner_domain) {
563 dev_err(dev, "failed to create IRQ domain\n");
564 return -ENOMEM;
565 }
566
567 msi->msi_domain = pci_msi_create_irq_domain(fwnode,
568 &brcm_msi_domain_info,
569 msi->inner_domain);
570 if (!msi->msi_domain) {
571 dev_err(dev, "failed to create MSI domain\n");
572 irq_domain_remove(msi->inner_domain);
573 return -ENOMEM;
574 }
575
576 return 0;
577}
578
579static void brcm_free_domains(struct brcm_msi *msi)
580{
581 irq_domain_remove(msi->msi_domain);
582 irq_domain_remove(msi->inner_domain);
583}
584
585static void brcm_msi_remove(struct brcm_pcie *pcie)
586{
587 struct brcm_msi *msi = pcie->msi;
588
589 if (!msi)
590 return;
591 irq_set_chained_handler_and_data(msi->irq, NULL, NULL);
592 brcm_free_domains(msi);
593}
594
595static void brcm_msi_set_regs(struct brcm_msi *msi)
596{
597 u32 val = msi->legacy ? BRCM_INT_PCI_MSI_LEGACY_MASK :
598 BRCM_INT_PCI_MSI_MASK;
599
600 writel(val, msi->intr_base + MSI_INT_MASK_CLR);
601 writel(val, msi->intr_base + MSI_INT_CLR);
602
603 /*
604 * The 0 bit of PCIE_MISC_MSI_BAR_CONFIG_LO is repurposed to MSI
605 * enable, which we set to 1.
606 */
607 writel(lower_32_bits(msi->target_addr) | 0x1,
608 msi->base + PCIE_MISC_MSI_BAR_CONFIG_LO);
609 writel(upper_32_bits(msi->target_addr),
610 msi->base + PCIE_MISC_MSI_BAR_CONFIG_HI);
611
612 val = msi->legacy ? PCIE_MISC_MSI_DATA_CONFIG_VAL_8 : PCIE_MISC_MSI_DATA_CONFIG_VAL_32;
613 writel(val, msi->base + PCIE_MISC_MSI_DATA_CONFIG);
614}
615
616static int brcm_pcie_enable_msi(struct brcm_pcie *pcie)
617{
618 struct brcm_msi *msi;
619 int irq, ret;
620 struct device *dev = pcie->dev;
621
622 irq = irq_of_parse_and_map(dev->of_node, 1);
623 if (irq <= 0) {
624 dev_err(dev, "cannot map MSI interrupt\n");
625 return -ENODEV;
626 }
627
628 msi = devm_kzalloc(dev, sizeof(struct brcm_msi), GFP_KERNEL);
629 if (!msi)
630 return -ENOMEM;
631
632 mutex_init(&msi->lock);
633 msi->dev = dev;
634 msi->base = pcie->base;
635 msi->np = pcie->np;
636 msi->target_addr = pcie->msi_target_addr;
637 msi->irq = irq;
638 msi->legacy = pcie->hw_rev < BRCM_PCIE_HW_REV_33;
639
640 /*
641 * Sanity check to make sure that the 'used' bitmap in struct brcm_msi
642 * is large enough.
643 */
644 BUILD_BUG_ON(BRCM_INT_PCI_MSI_LEGACY_NR > BRCM_INT_PCI_MSI_NR);
645
646 if (msi->legacy) {
647 msi->intr_base = msi->base + PCIE_INTR2_CPU_BASE;
648 msi->nr = BRCM_INT_PCI_MSI_LEGACY_NR;
649 msi->legacy_shift = 24;
650 } else {
651 msi->intr_base = msi->base + PCIE_MSI_INTR2_BASE;
652 msi->nr = BRCM_INT_PCI_MSI_NR;
653 msi->legacy_shift = 0;
654 }
655
656 ret = brcm_allocate_domains(msi);
657 if (ret)
658 return ret;
659
660 irq_set_chained_handler_and_data(msi->irq, brcm_pcie_msi_isr, msi);
661
662 brcm_msi_set_regs(msi);
663 pcie->msi = msi;
664
665 return 0;
666}
667
668/* The controller is capable of serving in both RC and EP roles */
669static bool brcm_pcie_rc_mode(struct brcm_pcie *pcie)
670{
671 void __iomem *base = pcie->base;
672 u32 val = readl(base + PCIE_MISC_PCIE_STATUS);
673
674 return !!FIELD_GET(PCIE_MISC_PCIE_STATUS_PCIE_PORT_MASK, val);
675}
676
677static bool brcm_pcie_link_up(struct brcm_pcie *pcie)
678{
679 u32 val = readl(pcie->base + PCIE_MISC_PCIE_STATUS);
680 u32 dla = FIELD_GET(PCIE_MISC_PCIE_STATUS_PCIE_DL_ACTIVE_MASK, val);
681 u32 plu = FIELD_GET(PCIE_MISC_PCIE_STATUS_PCIE_PHYLINKUP_MASK, val);
682
683 return dla && plu;
684}
685
686static void __iomem *brcm_pcie_map_bus(struct pci_bus *bus,
687 unsigned int devfn, int where)
688{
689 struct brcm_pcie *pcie = bus->sysdata;
690 void __iomem *base = pcie->base;
691 int idx;
692
693 /* Accesses to the RC go right to the RC registers if !devfn */
694 if (pci_is_root_bus(bus))
695 return devfn ? NULL : base + PCIE_ECAM_REG(where);
696
697 /* An access to our HW w/o link-up will cause a CPU Abort */
698 if (!brcm_pcie_link_up(pcie))
699 return NULL;
700
701 /* For devices, write to the config space index register */
702 idx = PCIE_ECAM_OFFSET(bus->number, devfn, 0);
703 writel(idx, pcie->base + PCIE_EXT_CFG_INDEX);
704 return base + PCIE_EXT_CFG_DATA + PCIE_ECAM_REG(where);
705}
706
707static void __iomem *brcm7425_pcie_map_bus(struct pci_bus *bus,
708 unsigned int devfn, int where)
709{
710 struct brcm_pcie *pcie = bus->sysdata;
711 void __iomem *base = pcie->base;
712 int idx;
713
714 /* Accesses to the RC go right to the RC registers if !devfn */
715 if (pci_is_root_bus(bus))
716 return devfn ? NULL : base + PCIE_ECAM_REG(where);
717
718 /* An access to our HW w/o link-up will cause a CPU Abort */
719 if (!brcm_pcie_link_up(pcie))
720 return NULL;
721
722 /* For devices, write to the config space index register */
723 idx = PCIE_ECAM_OFFSET(bus->number, devfn, where);
724 writel(idx, base + IDX_ADDR(pcie));
725 return base + DATA_ADDR(pcie);
726}
727
728static void brcm_pcie_bridge_sw_init_set_generic(struct brcm_pcie *pcie, u32 val)
729{
730 u32 tmp, mask = RGR1_SW_INIT_1_INIT_GENERIC_MASK;
731 u32 shift = RGR1_SW_INIT_1_INIT_GENERIC_SHIFT;
732
733 tmp = readl(pcie->base + PCIE_RGR1_SW_INIT_1(pcie));
734 tmp = (tmp & ~mask) | ((val << shift) & mask);
735 writel(tmp, pcie->base + PCIE_RGR1_SW_INIT_1(pcie));
736}
737
738static void brcm_pcie_bridge_sw_init_set_7278(struct brcm_pcie *pcie, u32 val)
739{
740 u32 tmp, mask = RGR1_SW_INIT_1_INIT_7278_MASK;
741 u32 shift = RGR1_SW_INIT_1_INIT_7278_SHIFT;
742
743 tmp = readl(pcie->base + PCIE_RGR1_SW_INIT_1(pcie));
744 tmp = (tmp & ~mask) | ((val << shift) & mask);
745 writel(tmp, pcie->base + PCIE_RGR1_SW_INIT_1(pcie));
746}
747
748static void brcm_pcie_perst_set_4908(struct brcm_pcie *pcie, u32 val)
749{
750 if (WARN_ONCE(!pcie->perst_reset, "missing PERST# reset controller\n"))
751 return;
752
753 if (val)
754 reset_control_assert(pcie->perst_reset);
755 else
756 reset_control_deassert(pcie->perst_reset);
757}
758
759static void brcm_pcie_perst_set_7278(struct brcm_pcie *pcie, u32 val)
760{
761 u32 tmp;
762
763 /* Perst bit has moved and assert value is 0 */
764 tmp = readl(pcie->base + PCIE_MISC_PCIE_CTRL);
765 u32p_replace_bits(&tmp, !val, PCIE_MISC_PCIE_CTRL_PCIE_PERSTB_MASK);
766 writel(tmp, pcie->base + PCIE_MISC_PCIE_CTRL);
767}
768
769static void brcm_pcie_perst_set_generic(struct brcm_pcie *pcie, u32 val)
770{
771 u32 tmp;
772
773 tmp = readl(pcie->base + PCIE_RGR1_SW_INIT_1(pcie));
774 u32p_replace_bits(&tmp, val, PCIE_RGR1_SW_INIT_1_PERST_MASK);
775 writel(tmp, pcie->base + PCIE_RGR1_SW_INIT_1(pcie));
776}
777
778static int brcm_pcie_get_rc_bar2_size_and_offset(struct brcm_pcie *pcie,
779 u64 *rc_bar2_size,
780 u64 *rc_bar2_offset)
781{
782 struct pci_host_bridge *bridge = pci_host_bridge_from_priv(pcie);
783 struct resource_entry *entry;
784 struct device *dev = pcie->dev;
785 u64 lowest_pcie_addr = ~(u64)0;
786 int ret, i = 0;
787 u64 size = 0;
788
789 resource_list_for_each_entry(entry, &bridge->dma_ranges) {
790 u64 pcie_beg = entry->res->start - entry->offset;
791
792 size += entry->res->end - entry->res->start + 1;
793 if (pcie_beg < lowest_pcie_addr)
794 lowest_pcie_addr = pcie_beg;
795 }
796
797 if (lowest_pcie_addr == ~(u64)0) {
798 dev_err(dev, "DT node has no dma-ranges\n");
799 return -EINVAL;
800 }
801
802 ret = of_property_read_variable_u64_array(pcie->np, "brcm,scb-sizes", pcie->memc_size, 1,
803 PCIE_BRCM_MAX_MEMC);
804
805 if (ret <= 0) {
806 /* Make an educated guess */
807 pcie->num_memc = 1;
808 pcie->memc_size[0] = 1ULL << fls64(size - 1);
809 } else {
810 pcie->num_memc = ret;
811 }
812
813 /* Each memc is viewed through a "port" that is a power of 2 */
814 for (i = 0, size = 0; i < pcie->num_memc; i++)
815 size += pcie->memc_size[i];
816
817 /* System memory starts at this address in PCIe-space */
818 *rc_bar2_offset = lowest_pcie_addr;
819 /* The sum of all memc views must also be a power of 2 */
820 *rc_bar2_size = 1ULL << fls64(size - 1);
821
822 /*
823 * We validate the inbound memory view even though we should trust
824 * whatever the device-tree provides. This is because of an HW issue on
825 * early Raspberry Pi 4's revisions (bcm2711). It turns out its
826 * firmware has to dynamically edit dma-ranges due to a bug on the
827 * PCIe controller integration, which prohibits any access above the
828 * lower 3GB of memory. Given this, we decided to keep the dma-ranges
829 * in check, avoiding hard to debug device-tree related issues in the
830 * future:
831 *
832 * The PCIe host controller by design must set the inbound viewport to
833 * be a contiguous arrangement of all of the system's memory. In
834 * addition, its size mut be a power of two. To further complicate
835 * matters, the viewport must start on a pcie-address that is aligned
836 * on a multiple of its size. If a portion of the viewport does not
837 * represent system memory -- e.g. 3GB of memory requires a 4GB
838 * viewport -- we can map the outbound memory in or after 3GB and even
839 * though the viewport will overlap the outbound memory the controller
840 * will know to send outbound memory downstream and everything else
841 * upstream.
842 *
843 * For example:
844 *
845 * - The best-case scenario, memory up to 3GB, is to place the inbound
846 * region in the first 4GB of pcie-space, as some legacy devices can
847 * only address 32bits. We would also like to put the MSI under 4GB
848 * as well, since some devices require a 32bit MSI target address.
849 *
850 * - If the system memory is 4GB or larger we cannot start the inbound
851 * region at location 0 (since we have to allow some space for
852 * outbound memory @ 3GB). So instead it will start at the 1x
853 * multiple of its size
854 */
855 if (!*rc_bar2_size || (*rc_bar2_offset & (*rc_bar2_size - 1)) ||
856 (*rc_bar2_offset < SZ_4G && *rc_bar2_offset > SZ_2G)) {
857 dev_err(dev, "Invalid rc_bar2_offset/size: size 0x%llx, off 0x%llx\n",
858 *rc_bar2_size, *rc_bar2_offset);
859 return -EINVAL;
860 }
861
862 return 0;
863}
864
865static int brcm_pcie_setup(struct brcm_pcie *pcie)
866{
867 u64 rc_bar2_offset, rc_bar2_size;
868 void __iomem *base = pcie->base;
869 struct pci_host_bridge *bridge;
870 struct resource_entry *entry;
871 u32 tmp, burst, aspm_support;
872 int num_out_wins = 0;
873 int ret, memc;
874
875 /* Reset the bridge */
876 pcie->bridge_sw_init_set(pcie, 1);
877 usleep_range(100, 200);
878
879 /* Take the bridge out of reset */
880 pcie->bridge_sw_init_set(pcie, 0);
881
882 tmp = readl(base + PCIE_MISC_HARD_PCIE_HARD_DEBUG);
883 if (is_bmips(pcie))
884 tmp &= ~PCIE_BMIPS_MISC_HARD_PCIE_HARD_DEBUG_SERDES_IDDQ_MASK;
885 else
886 tmp &= ~PCIE_MISC_HARD_PCIE_HARD_DEBUG_SERDES_IDDQ_MASK;
887 writel(tmp, base + PCIE_MISC_HARD_PCIE_HARD_DEBUG);
888 /* Wait for SerDes to be stable */
889 usleep_range(100, 200);
890
891 /*
892 * SCB_MAX_BURST_SIZE is a two bit field. For GENERIC chips it
893 * is encoded as 0=128, 1=256, 2=512, 3=Rsvd, for BCM7278 it
894 * is encoded as 0=Rsvd, 1=128, 2=256, 3=512.
895 */
896 if (is_bmips(pcie))
897 burst = 0x1; /* 256 bytes */
898 else if (pcie->type == BCM2711)
899 burst = 0x0; /* 128 bytes */
900 else if (pcie->type == BCM7278)
901 burst = 0x3; /* 512 bytes */
902 else
903 burst = 0x2; /* 512 bytes */
904
905 /*
906 * Set SCB_MAX_BURST_SIZE, CFG_READ_UR_MODE, SCB_ACCESS_EN,
907 * RCB_MPS_MODE, RCB_64B_MODE
908 */
909 tmp = readl(base + PCIE_MISC_MISC_CTRL);
910 u32p_replace_bits(&tmp, 1, PCIE_MISC_MISC_CTRL_SCB_ACCESS_EN_MASK);
911 u32p_replace_bits(&tmp, 1, PCIE_MISC_MISC_CTRL_CFG_READ_UR_MODE_MASK);
912 u32p_replace_bits(&tmp, burst, PCIE_MISC_MISC_CTRL_MAX_BURST_SIZE_MASK);
913 u32p_replace_bits(&tmp, 1, PCIE_MISC_MISC_CTRL_PCIE_RCB_MPS_MODE_MASK);
914 u32p_replace_bits(&tmp, 1, PCIE_MISC_MISC_CTRL_PCIE_RCB_64B_MODE_MASK);
915 writel(tmp, base + PCIE_MISC_MISC_CTRL);
916
917 ret = brcm_pcie_get_rc_bar2_size_and_offset(pcie, &rc_bar2_size,
918 &rc_bar2_offset);
919 if (ret)
920 return ret;
921
922 tmp = lower_32_bits(rc_bar2_offset);
923 u32p_replace_bits(&tmp, brcm_pcie_encode_ibar_size(rc_bar2_size),
924 PCIE_MISC_RC_BAR2_CONFIG_LO_SIZE_MASK);
925 writel(tmp, base + PCIE_MISC_RC_BAR2_CONFIG_LO);
926 writel(upper_32_bits(rc_bar2_offset),
927 base + PCIE_MISC_RC_BAR2_CONFIG_HI);
928
929 tmp = readl(base + PCIE_MISC_MISC_CTRL);
930 for (memc = 0; memc < pcie->num_memc; memc++) {
931 u32 scb_size_val = ilog2(pcie->memc_size[memc]) - 15;
932
933 if (memc == 0)
934 u32p_replace_bits(&tmp, scb_size_val, SCB_SIZE_MASK(0));
935 else if (memc == 1)
936 u32p_replace_bits(&tmp, scb_size_val, SCB_SIZE_MASK(1));
937 else if (memc == 2)
938 u32p_replace_bits(&tmp, scb_size_val, SCB_SIZE_MASK(2));
939 }
940 writel(tmp, base + PCIE_MISC_MISC_CTRL);
941
942 /*
943 * We ideally want the MSI target address to be located in the 32bit
944 * addressable memory area. Some devices might depend on it. This is
945 * possible either when the inbound window is located above the lower
946 * 4GB or when the inbound area is smaller than 4GB (taking into
947 * account the rounding-up we're forced to perform).
948 */
949 if (rc_bar2_offset >= SZ_4G || (rc_bar2_size + rc_bar2_offset) < SZ_4G)
950 pcie->msi_target_addr = BRCM_MSI_TARGET_ADDR_LT_4GB;
951 else
952 pcie->msi_target_addr = BRCM_MSI_TARGET_ADDR_GT_4GB;
953
954 if (!brcm_pcie_rc_mode(pcie)) {
955 dev_err(pcie->dev, "PCIe RC controller misconfigured as Endpoint\n");
956 return -EINVAL;
957 }
958
959 /* disable the PCIe->GISB memory window (RC_BAR1) */
960 tmp = readl(base + PCIE_MISC_RC_BAR1_CONFIG_LO);
961 tmp &= ~PCIE_MISC_RC_BAR1_CONFIG_LO_SIZE_MASK;
962 writel(tmp, base + PCIE_MISC_RC_BAR1_CONFIG_LO);
963
964 /* disable the PCIe->SCB memory window (RC_BAR3) */
965 tmp = readl(base + PCIE_MISC_RC_BAR3_CONFIG_LO);
966 tmp &= ~PCIE_MISC_RC_BAR3_CONFIG_LO_SIZE_MASK;
967 writel(tmp, base + PCIE_MISC_RC_BAR3_CONFIG_LO);
968
969 /* Don't advertise L0s capability if 'aspm-no-l0s' */
970 aspm_support = PCIE_LINK_STATE_L1;
971 if (!of_property_read_bool(pcie->np, "aspm-no-l0s"))
972 aspm_support |= PCIE_LINK_STATE_L0S;
973 tmp = readl(base + PCIE_RC_CFG_PRIV1_LINK_CAPABILITY);
974 u32p_replace_bits(&tmp, aspm_support,
975 PCIE_RC_CFG_PRIV1_LINK_CAPABILITY_ASPM_SUPPORT_MASK);
976 writel(tmp, base + PCIE_RC_CFG_PRIV1_LINK_CAPABILITY);
977
978 /*
979 * For config space accesses on the RC, show the right class for
980 * a PCIe-PCIe bridge (the default setting is to be EP mode).
981 */
982 tmp = readl(base + PCIE_RC_CFG_PRIV1_ID_VAL3);
983 u32p_replace_bits(&tmp, 0x060400,
984 PCIE_RC_CFG_PRIV1_ID_VAL3_CLASS_CODE_MASK);
985 writel(tmp, base + PCIE_RC_CFG_PRIV1_ID_VAL3);
986
987 bridge = pci_host_bridge_from_priv(pcie);
988 resource_list_for_each_entry(entry, &bridge->windows) {
989 struct resource *res = entry->res;
990
991 if (resource_type(res) != IORESOURCE_MEM)
992 continue;
993
994 if (num_out_wins >= BRCM_NUM_PCIE_OUT_WINS) {
995 dev_err(pcie->dev, "too many outbound wins\n");
996 return -EINVAL;
997 }
998
999 if (is_bmips(pcie)) {
1000 u64 start = res->start;
1001 unsigned int j, nwins = resource_size(res) / SZ_128M;
1002
1003 /* bmips PCIe outbound windows have a 128MB max size */
1004 if (nwins > BRCM_NUM_PCIE_OUT_WINS)
1005 nwins = BRCM_NUM_PCIE_OUT_WINS;
1006 for (j = 0; j < nwins; j++, start += SZ_128M)
1007 brcm_pcie_set_outbound_win(pcie, j, start,
1008 start - entry->offset,
1009 SZ_128M);
1010 break;
1011 }
1012 brcm_pcie_set_outbound_win(pcie, num_out_wins, res->start,
1013 res->start - entry->offset,
1014 resource_size(res));
1015 num_out_wins++;
1016 }
1017
1018 /* PCIe->SCB endian mode for BAR */
1019 tmp = readl(base + PCIE_RC_CFG_VENDOR_VENDOR_SPECIFIC_REG1);
1020 u32p_replace_bits(&tmp, PCIE_RC_CFG_VENDOR_SPCIFIC_REG1_LITTLE_ENDIAN,
1021 PCIE_RC_CFG_VENDOR_VENDOR_SPECIFIC_REG1_ENDIAN_MODE_BAR2_MASK);
1022 writel(tmp, base + PCIE_RC_CFG_VENDOR_VENDOR_SPECIFIC_REG1);
1023
1024 return 0;
1025}
1026
1027static int brcm_pcie_start_link(struct brcm_pcie *pcie)
1028{
1029 struct device *dev = pcie->dev;
1030 void __iomem *base = pcie->base;
1031 u16 nlw, cls, lnksta;
1032 bool ssc_good = false;
1033 u32 tmp;
1034 int ret, i;
1035
1036 /* Unassert the fundamental reset */
1037 pcie->perst_set(pcie, 0);
1038
1039 /*
1040 * Wait for 100ms after PERST# deassertion; see PCIe CEM specification
1041 * sections 2.2, PCIe r5.0, 6.6.1.
1042 */
1043 msleep(100);
1044
1045 /*
1046 * Give the RC/EP even more time to wake up, before trying to
1047 * configure RC. Intermittently check status for link-up, up to a
1048 * total of 100ms.
1049 */
1050 for (i = 0; i < 100 && !brcm_pcie_link_up(pcie); i += 5)
1051 msleep(5);
1052
1053 if (!brcm_pcie_link_up(pcie)) {
1054 dev_err(dev, "link down\n");
1055 return -ENODEV;
1056 }
1057
1058 if (pcie->gen)
1059 brcm_pcie_set_gen(pcie, pcie->gen);
1060
1061 if (pcie->ssc) {
1062 ret = brcm_pcie_set_ssc(pcie);
1063 if (ret == 0)
1064 ssc_good = true;
1065 else
1066 dev_err(dev, "failed attempt to enter ssc mode\n");
1067 }
1068
1069 lnksta = readw(base + BRCM_PCIE_CAP_REGS + PCI_EXP_LNKSTA);
1070 cls = FIELD_GET(PCI_EXP_LNKSTA_CLS, lnksta);
1071 nlw = FIELD_GET(PCI_EXP_LNKSTA_NLW, lnksta);
1072 dev_info(dev, "link up, %s x%u %s\n",
1073 pci_speed_string(pcie_link_speed[cls]), nlw,
1074 ssc_good ? "(SSC)" : "(!SSC)");
1075
1076 /*
1077 * Refclk from RC should be gated with CLKREQ# input when ASPM L0s,L1
1078 * is enabled => setting the CLKREQ_DEBUG_ENABLE field to 1.
1079 */
1080 tmp = readl(base + PCIE_MISC_HARD_PCIE_HARD_DEBUG);
1081 tmp |= PCIE_MISC_HARD_PCIE_HARD_DEBUG_CLKREQ_DEBUG_ENABLE_MASK;
1082 writel(tmp, base + PCIE_MISC_HARD_PCIE_HARD_DEBUG);
1083
1084 return 0;
1085}
1086
1087static const char * const supplies[] = {
1088 "vpcie3v3",
1089 "vpcie3v3aux",
1090 "vpcie12v",
1091};
1092
1093static void *alloc_subdev_regulators(struct device *dev)
1094{
1095 const size_t size = sizeof(struct subdev_regulators) +
1096 sizeof(struct regulator_bulk_data) * ARRAY_SIZE(supplies);
1097 struct subdev_regulators *sr;
1098 int i;
1099
1100 sr = devm_kzalloc(dev, size, GFP_KERNEL);
1101 if (sr) {
1102 sr->num_supplies = ARRAY_SIZE(supplies);
1103 for (i = 0; i < ARRAY_SIZE(supplies); i++)
1104 sr->supplies[i].supply = supplies[i];
1105 }
1106
1107 return sr;
1108}
1109
1110static int brcm_pcie_add_bus(struct pci_bus *bus)
1111{
1112 struct brcm_pcie *pcie = bus->sysdata;
1113 struct device *dev = &bus->dev;
1114 struct subdev_regulators *sr;
1115 int ret;
1116
1117 if (!bus->parent || !pci_is_root_bus(bus->parent))
1118 return 0;
1119
1120 if (dev->of_node) {
1121 sr = alloc_subdev_regulators(dev);
1122 if (!sr) {
1123 dev_info(dev, "Can't allocate regulators for downstream device\n");
1124 goto no_regulators;
1125 }
1126
1127 pcie->sr = sr;
1128
1129 ret = regulator_bulk_get(dev, sr->num_supplies, sr->supplies);
1130 if (ret) {
1131 dev_info(dev, "No regulators for downstream device\n");
1132 goto no_regulators;
1133 }
1134
1135 ret = regulator_bulk_enable(sr->num_supplies, sr->supplies);
1136 if (ret) {
1137 dev_err(dev, "Can't enable regulators for downstream device\n");
1138 regulator_bulk_free(sr->num_supplies, sr->supplies);
1139 pcie->sr = NULL;
1140 }
1141 }
1142
1143no_regulators:
1144 brcm_pcie_start_link(pcie);
1145 return 0;
1146}
1147
1148static void brcm_pcie_remove_bus(struct pci_bus *bus)
1149{
1150 struct brcm_pcie *pcie = bus->sysdata;
1151 struct subdev_regulators *sr = pcie->sr;
1152 struct device *dev = &bus->dev;
1153
1154 if (!sr)
1155 return;
1156
1157 if (regulator_bulk_disable(sr->num_supplies, sr->supplies))
1158 dev_err(dev, "Failed to disable regulators for downstream device\n");
1159 regulator_bulk_free(sr->num_supplies, sr->supplies);
1160 pcie->sr = NULL;
1161}
1162
1163/* L23 is a low-power PCIe link state */
1164static void brcm_pcie_enter_l23(struct brcm_pcie *pcie)
1165{
1166 void __iomem *base = pcie->base;
1167 int l23, i;
1168 u32 tmp;
1169
1170 /* Assert request for L23 */
1171 tmp = readl(base + PCIE_MISC_PCIE_CTRL);
1172 u32p_replace_bits(&tmp, 1, PCIE_MISC_PCIE_CTRL_PCIE_L23_REQUEST_MASK);
1173 writel(tmp, base + PCIE_MISC_PCIE_CTRL);
1174
1175 /* Wait up to 36 msec for L23 */
1176 tmp = readl(base + PCIE_MISC_PCIE_STATUS);
1177 l23 = FIELD_GET(PCIE_MISC_PCIE_STATUS_PCIE_LINK_IN_L23_MASK, tmp);
1178 for (i = 0; i < 15 && !l23; i++) {
1179 usleep_range(2000, 2400);
1180 tmp = readl(base + PCIE_MISC_PCIE_STATUS);
1181 l23 = FIELD_GET(PCIE_MISC_PCIE_STATUS_PCIE_LINK_IN_L23_MASK,
1182 tmp);
1183 }
1184
1185 if (!l23)
1186 dev_err(pcie->dev, "failed to enter low-power link state\n");
1187}
1188
1189static int brcm_phy_cntl(struct brcm_pcie *pcie, const int start)
1190{
1191 static const u32 shifts[PCIE_DVT_PMU_PCIE_PHY_CTRL_DAST_NFLDS] = {
1192 PCIE_DVT_PMU_PCIE_PHY_CTRL_DAST_PWRDN_SHIFT,
1193 PCIE_DVT_PMU_PCIE_PHY_CTRL_DAST_RESET_SHIFT,
1194 PCIE_DVT_PMU_PCIE_PHY_CTRL_DAST_DIG_RESET_SHIFT,};
1195 static const u32 masks[PCIE_DVT_PMU_PCIE_PHY_CTRL_DAST_NFLDS] = {
1196 PCIE_DVT_PMU_PCIE_PHY_CTRL_DAST_PWRDN_MASK,
1197 PCIE_DVT_PMU_PCIE_PHY_CTRL_DAST_RESET_MASK,
1198 PCIE_DVT_PMU_PCIE_PHY_CTRL_DAST_DIG_RESET_MASK,};
1199 const int beg = start ? 0 : PCIE_DVT_PMU_PCIE_PHY_CTRL_DAST_NFLDS - 1;
1200 const int end = start ? PCIE_DVT_PMU_PCIE_PHY_CTRL_DAST_NFLDS : -1;
1201 u32 tmp, combined_mask = 0;
1202 u32 val;
1203 void __iomem *base = pcie->base;
1204 int i, ret;
1205
1206 for (i = beg; i != end; start ? i++ : i--) {
1207 val = start ? BIT_MASK(shifts[i]) : 0;
1208 tmp = readl(base + PCIE_DVT_PMU_PCIE_PHY_CTRL);
1209 tmp = (tmp & ~masks[i]) | (val & masks[i]);
1210 writel(tmp, base + PCIE_DVT_PMU_PCIE_PHY_CTRL);
1211 usleep_range(50, 200);
1212 combined_mask |= masks[i];
1213 }
1214
1215 tmp = readl(base + PCIE_DVT_PMU_PCIE_PHY_CTRL);
1216 val = start ? combined_mask : 0;
1217
1218 ret = (tmp & combined_mask) == val ? 0 : -EIO;
1219 if (ret)
1220 dev_err(pcie->dev, "failed to %s phy\n", (start ? "start" : "stop"));
1221
1222 return ret;
1223}
1224
1225static inline int brcm_phy_start(struct brcm_pcie *pcie)
1226{
1227 return pcie->rescal ? brcm_phy_cntl(pcie, 1) : 0;
1228}
1229
1230static inline int brcm_phy_stop(struct brcm_pcie *pcie)
1231{
1232 return pcie->rescal ? brcm_phy_cntl(pcie, 0) : 0;
1233}
1234
1235static void brcm_pcie_turn_off(struct brcm_pcie *pcie)
1236{
1237 void __iomem *base = pcie->base;
1238 int tmp;
1239
1240 if (brcm_pcie_link_up(pcie))
1241 brcm_pcie_enter_l23(pcie);
1242 /* Assert fundamental reset */
1243 pcie->perst_set(pcie, 1);
1244
1245 /* Deassert request for L23 in case it was asserted */
1246 tmp = readl(base + PCIE_MISC_PCIE_CTRL);
1247 u32p_replace_bits(&tmp, 0, PCIE_MISC_PCIE_CTRL_PCIE_L23_REQUEST_MASK);
1248 writel(tmp, base + PCIE_MISC_PCIE_CTRL);
1249
1250 /* Turn off SerDes */
1251 tmp = readl(base + PCIE_MISC_HARD_PCIE_HARD_DEBUG);
1252 u32p_replace_bits(&tmp, 1, PCIE_MISC_HARD_PCIE_HARD_DEBUG_SERDES_IDDQ_MASK);
1253 writel(tmp, base + PCIE_MISC_HARD_PCIE_HARD_DEBUG);
1254
1255 /* Shutdown PCIe bridge */
1256 pcie->bridge_sw_init_set(pcie, 1);
1257}
1258
1259static int pci_dev_may_wakeup(struct pci_dev *dev, void *data)
1260{
1261 bool *ret = data;
1262
1263 if (device_may_wakeup(&dev->dev)) {
1264 *ret = true;
1265 dev_info(&dev->dev, "Possible wake-up device; regulators will not be disabled\n");
1266 }
1267 return (int) *ret;
1268}
1269
1270static int brcm_pcie_suspend_noirq(struct device *dev)
1271{
1272 struct brcm_pcie *pcie = dev_get_drvdata(dev);
1273 struct pci_host_bridge *bridge = pci_host_bridge_from_priv(pcie);
1274 int ret;
1275
1276 brcm_pcie_turn_off(pcie);
1277 /*
1278 * If brcm_phy_stop() returns an error, just dev_err(). If we
1279 * return the error it will cause the suspend to fail and this is a
1280 * forgivable offense that will probably be erased on resume.
1281 */
1282 if (brcm_phy_stop(pcie))
1283 dev_err(dev, "Could not stop phy for suspend\n");
1284
1285 ret = reset_control_rearm(pcie->rescal);
1286 if (ret) {
1287 dev_err(dev, "Could not rearm rescal reset\n");
1288 return ret;
1289 }
1290
1291 if (pcie->sr) {
1292 /*
1293 * Now turn off the regulators, but if at least one
1294 * downstream device is enabled as a wake-up source, do not
1295 * turn off regulators.
1296 */
1297 pcie->ep_wakeup_capable = false;
1298 pci_walk_bus(bridge->bus, pci_dev_may_wakeup,
1299 &pcie->ep_wakeup_capable);
1300 if (!pcie->ep_wakeup_capable) {
1301 ret = regulator_bulk_disable(pcie->sr->num_supplies,
1302 pcie->sr->supplies);
1303 if (ret) {
1304 dev_err(dev, "Could not turn off regulators\n");
1305 reset_control_reset(pcie->rescal);
1306 return ret;
1307 }
1308 }
1309 }
1310 clk_disable_unprepare(pcie->clk);
1311
1312 return 0;
1313}
1314
1315static int brcm_pcie_resume_noirq(struct device *dev)
1316{
1317 struct brcm_pcie *pcie = dev_get_drvdata(dev);
1318 void __iomem *base;
1319 u32 tmp;
1320 int ret;
1321
1322 base = pcie->base;
1323 ret = clk_prepare_enable(pcie->clk);
1324 if (ret)
1325 return ret;
1326
1327 ret = reset_control_reset(pcie->rescal);
1328 if (ret)
1329 goto err_disable_clk;
1330
1331 ret = brcm_phy_start(pcie);
1332 if (ret)
1333 goto err_reset;
1334
1335 /* Take bridge out of reset so we can access the SERDES reg */
1336 pcie->bridge_sw_init_set(pcie, 0);
1337
1338 /* SERDES_IDDQ = 0 */
1339 tmp = readl(base + PCIE_MISC_HARD_PCIE_HARD_DEBUG);
1340 u32p_replace_bits(&tmp, 0, PCIE_MISC_HARD_PCIE_HARD_DEBUG_SERDES_IDDQ_MASK);
1341 writel(tmp, base + PCIE_MISC_HARD_PCIE_HARD_DEBUG);
1342
1343 /* wait for serdes to be stable */
1344 udelay(100);
1345
1346 ret = brcm_pcie_setup(pcie);
1347 if (ret)
1348 goto err_reset;
1349
1350 if (pcie->sr) {
1351 if (pcie->ep_wakeup_capable) {
1352 /*
1353 * We are resuming from a suspend. In the suspend we
1354 * did not disable the power supplies, so there is
1355 * no need to enable them (and falsely increase their
1356 * usage count).
1357 */
1358 pcie->ep_wakeup_capable = false;
1359 } else {
1360 ret = regulator_bulk_enable(pcie->sr->num_supplies,
1361 pcie->sr->supplies);
1362 if (ret) {
1363 dev_err(dev, "Could not turn on regulators\n");
1364 goto err_reset;
1365 }
1366 }
1367 }
1368
1369 ret = brcm_pcie_start_link(pcie);
1370 if (ret)
1371 goto err_regulator;
1372
1373 if (pcie->msi)
1374 brcm_msi_set_regs(pcie->msi);
1375
1376 return 0;
1377
1378err_regulator:
1379 if (pcie->sr)
1380 regulator_bulk_disable(pcie->sr->num_supplies, pcie->sr->supplies);
1381err_reset:
1382 reset_control_rearm(pcie->rescal);
1383err_disable_clk:
1384 clk_disable_unprepare(pcie->clk);
1385 return ret;
1386}
1387
1388static void __brcm_pcie_remove(struct brcm_pcie *pcie)
1389{
1390 brcm_msi_remove(pcie);
1391 brcm_pcie_turn_off(pcie);
1392 if (brcm_phy_stop(pcie))
1393 dev_err(pcie->dev, "Could not stop phy\n");
1394 if (reset_control_rearm(pcie->rescal))
1395 dev_err(pcie->dev, "Could not rearm rescal reset\n");
1396 clk_disable_unprepare(pcie->clk);
1397}
1398
1399static int brcm_pcie_remove(struct platform_device *pdev)
1400{
1401 struct brcm_pcie *pcie = platform_get_drvdata(pdev);
1402 struct pci_host_bridge *bridge = pci_host_bridge_from_priv(pcie);
1403
1404 pci_stop_root_bus(bridge->bus);
1405 pci_remove_root_bus(bridge->bus);
1406 __brcm_pcie_remove(pcie);
1407
1408 return 0;
1409}
1410
1411static const int pcie_offsets[] = {
1412 [RGR1_SW_INIT_1] = 0x9210,
1413 [EXT_CFG_INDEX] = 0x9000,
1414 [EXT_CFG_DATA] = 0x9004,
1415};
1416
1417static const int pcie_offsets_bmips_7425[] = {
1418 [RGR1_SW_INIT_1] = 0x8010,
1419 [EXT_CFG_INDEX] = 0x8300,
1420 [EXT_CFG_DATA] = 0x8304,
1421};
1422
1423static const struct pcie_cfg_data generic_cfg = {
1424 .offsets = pcie_offsets,
1425 .type = GENERIC,
1426 .perst_set = brcm_pcie_perst_set_generic,
1427 .bridge_sw_init_set = brcm_pcie_bridge_sw_init_set_generic,
1428};
1429
1430static const struct pcie_cfg_data bcm7425_cfg = {
1431 .offsets = pcie_offsets_bmips_7425,
1432 .type = BCM7425,
1433 .perst_set = brcm_pcie_perst_set_generic,
1434 .bridge_sw_init_set = brcm_pcie_bridge_sw_init_set_generic,
1435};
1436
1437static const struct pcie_cfg_data bcm7435_cfg = {
1438 .offsets = pcie_offsets,
1439 .type = BCM7435,
1440 .perst_set = brcm_pcie_perst_set_generic,
1441 .bridge_sw_init_set = brcm_pcie_bridge_sw_init_set_generic,
1442};
1443
1444static const struct pcie_cfg_data bcm4908_cfg = {
1445 .offsets = pcie_offsets,
1446 .type = BCM4908,
1447 .perst_set = brcm_pcie_perst_set_4908,
1448 .bridge_sw_init_set = brcm_pcie_bridge_sw_init_set_generic,
1449};
1450
1451static const int pcie_offset_bcm7278[] = {
1452 [RGR1_SW_INIT_1] = 0xc010,
1453 [EXT_CFG_INDEX] = 0x9000,
1454 [EXT_CFG_DATA] = 0x9004,
1455};
1456
1457static const struct pcie_cfg_data bcm7278_cfg = {
1458 .offsets = pcie_offset_bcm7278,
1459 .type = BCM7278,
1460 .perst_set = brcm_pcie_perst_set_7278,
1461 .bridge_sw_init_set = brcm_pcie_bridge_sw_init_set_7278,
1462};
1463
1464static const struct pcie_cfg_data bcm2711_cfg = {
1465 .offsets = pcie_offsets,
1466 .type = BCM2711,
1467 .perst_set = brcm_pcie_perst_set_generic,
1468 .bridge_sw_init_set = brcm_pcie_bridge_sw_init_set_generic,
1469};
1470
1471static const struct of_device_id brcm_pcie_match[] = {
1472 { .compatible = "brcm,bcm2711-pcie", .data = &bcm2711_cfg },
1473 { .compatible = "brcm,bcm4908-pcie", .data = &bcm4908_cfg },
1474 { .compatible = "brcm,bcm7211-pcie", .data = &generic_cfg },
1475 { .compatible = "brcm,bcm7278-pcie", .data = &bcm7278_cfg },
1476 { .compatible = "brcm,bcm7216-pcie", .data = &bcm7278_cfg },
1477 { .compatible = "brcm,bcm7445-pcie", .data = &generic_cfg },
1478 { .compatible = "brcm,bcm7435-pcie", .data = &bcm7435_cfg },
1479 { .compatible = "brcm,bcm7425-pcie", .data = &bcm7425_cfg },
1480 {},
1481};
1482
1483static struct pci_ops brcm_pcie_ops = {
1484 .map_bus = brcm_pcie_map_bus,
1485 .read = pci_generic_config_read,
1486 .write = pci_generic_config_write,
1487 .add_bus = brcm_pcie_add_bus,
1488 .remove_bus = brcm_pcie_remove_bus,
1489};
1490
1491static struct pci_ops brcm7425_pcie_ops = {
1492 .map_bus = brcm7425_pcie_map_bus,
1493 .read = pci_generic_config_read32,
1494 .write = pci_generic_config_write32,
1495 .add_bus = brcm_pcie_add_bus,
1496 .remove_bus = brcm_pcie_remove_bus,
1497};
1498
1499static int brcm_pcie_probe(struct platform_device *pdev)
1500{
1501 struct device_node *np = pdev->dev.of_node, *msi_np;
1502 struct pci_host_bridge *bridge;
1503 const struct pcie_cfg_data *data;
1504 struct brcm_pcie *pcie;
1505 int ret;
1506
1507 bridge = devm_pci_alloc_host_bridge(&pdev->dev, sizeof(*pcie));
1508 if (!bridge)
1509 return -ENOMEM;
1510
1511 data = of_device_get_match_data(&pdev->dev);
1512 if (!data) {
1513 pr_err("failed to look up compatible string\n");
1514 return -EINVAL;
1515 }
1516
1517 pcie = pci_host_bridge_priv(bridge);
1518 pcie->dev = &pdev->dev;
1519 pcie->np = np;
1520 pcie->reg_offsets = data->offsets;
1521 pcie->type = data->type;
1522 pcie->perst_set = data->perst_set;
1523 pcie->bridge_sw_init_set = data->bridge_sw_init_set;
1524
1525 pcie->base = devm_platform_ioremap_resource(pdev, 0);
1526 if (IS_ERR(pcie->base))
1527 return PTR_ERR(pcie->base);
1528
1529 pcie->clk = devm_clk_get_optional(&pdev->dev, "sw_pcie");
1530 if (IS_ERR(pcie->clk))
1531 return PTR_ERR(pcie->clk);
1532
1533 ret = of_pci_get_max_link_speed(np);
1534 pcie->gen = (ret < 0) ? 0 : ret;
1535
1536 pcie->ssc = of_property_read_bool(np, "brcm,enable-ssc");
1537
1538 ret = clk_prepare_enable(pcie->clk);
1539 if (ret) {
1540 dev_err(&pdev->dev, "could not enable clock\n");
1541 return ret;
1542 }
1543 pcie->rescal = devm_reset_control_get_optional_shared(&pdev->dev, "rescal");
1544 if (IS_ERR(pcie->rescal)) {
1545 clk_disable_unprepare(pcie->clk);
1546 return PTR_ERR(pcie->rescal);
1547 }
1548 pcie->perst_reset = devm_reset_control_get_optional_exclusive(&pdev->dev, "perst");
1549 if (IS_ERR(pcie->perst_reset)) {
1550 clk_disable_unprepare(pcie->clk);
1551 return PTR_ERR(pcie->perst_reset);
1552 }
1553
1554 ret = reset_control_reset(pcie->rescal);
1555 if (ret)
1556 dev_err(&pdev->dev, "failed to deassert 'rescal'\n");
1557
1558 ret = brcm_phy_start(pcie);
1559 if (ret) {
1560 reset_control_rearm(pcie->rescal);
1561 clk_disable_unprepare(pcie->clk);
1562 return ret;
1563 }
1564
1565 ret = brcm_pcie_setup(pcie);
1566 if (ret)
1567 goto fail;
1568
1569 pcie->hw_rev = readl(pcie->base + PCIE_MISC_REVISION);
1570 if (pcie->type == BCM4908 && pcie->hw_rev >= BRCM_PCIE_HW_REV_3_20) {
1571 dev_err(pcie->dev, "hardware revision with unsupported PERST# setup\n");
1572 ret = -ENODEV;
1573 goto fail;
1574 }
1575
1576 msi_np = of_parse_phandle(pcie->np, "msi-parent", 0);
1577 if (pci_msi_enabled() && msi_np == pcie->np) {
1578 ret = brcm_pcie_enable_msi(pcie);
1579 if (ret) {
1580 dev_err(pcie->dev, "probe of internal MSI failed");
1581 goto fail;
1582 }
1583 }
1584
1585 bridge->ops = pcie->type == BCM7425 ? &brcm7425_pcie_ops : &brcm_pcie_ops;
1586 bridge->sysdata = pcie;
1587
1588 platform_set_drvdata(pdev, pcie);
1589
1590 ret = pci_host_probe(bridge);
1591 if (!ret && !brcm_pcie_link_up(pcie))
1592 ret = -ENODEV;
1593
1594 if (ret) {
1595 brcm_pcie_remove(pdev);
1596 return ret;
1597 }
1598
1599 return 0;
1600
1601fail:
1602 __brcm_pcie_remove(pcie);
1603 return ret;
1604}
1605
1606MODULE_DEVICE_TABLE(of, brcm_pcie_match);
1607
1608static const struct dev_pm_ops brcm_pcie_pm_ops = {
1609 .suspend_noirq = brcm_pcie_suspend_noirq,
1610 .resume_noirq = brcm_pcie_resume_noirq,
1611};
1612
1613static struct platform_driver brcm_pcie_driver = {
1614 .probe = brcm_pcie_probe,
1615 .remove = brcm_pcie_remove,
1616 .driver = {
1617 .name = "brcm-pcie",
1618 .of_match_table = brcm_pcie_match,
1619 .pm = &brcm_pcie_pm_ops,
1620 },
1621};
1622module_platform_driver(brcm_pcie_driver);
1623
1624MODULE_LICENSE("GPL");
1625MODULE_DESCRIPTION("Broadcom STB PCIe RC driver");
1626MODULE_AUTHOR("Broadcom");