1 // SPDX-License-Identifier: GPL-2.0+
2 /* Copyright (C) 2009 - 2019 Broadcom */
4 #include <linux/bitfield.h>
5 #include <linux/bitops.h>
7 #include <linux/compiler.h>
8 #include <linux/delay.h>
9 #include <linux/init.h>
10 #include <linux/interrupt.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/reset.h>
27 #include <linux/sizes.h>
28 #include <linux/slab.h>
29 #include <linux/string.h>
30 #include <linux/types.h>
34 /* BRCM_PCIE_CAP_REGS - Offset for the mandatory capability config regs */
35 #define BRCM_PCIE_CAP_REGS 0x00ac
37 /* Broadcom STB PCIe Register Offsets */
38 #define PCIE_RC_CFG_VENDOR_VENDOR_SPECIFIC_REG1 0x0188
39 #define PCIE_RC_CFG_VENDOR_VENDOR_SPECIFIC_REG1_ENDIAN_MODE_BAR2_MASK 0xc
40 #define PCIE_RC_CFG_VENDOR_SPCIFIC_REG1_LITTLE_ENDIAN 0x0
42 #define PCIE_RC_CFG_PRIV1_ID_VAL3 0x043c
43 #define PCIE_RC_CFG_PRIV1_ID_VAL3_CLASS_CODE_MASK 0xffffff
45 #define PCIE_RC_CFG_PRIV1_LINK_CAPABILITY 0x04dc
46 #define PCIE_RC_CFG_PRIV1_LINK_CAPABILITY_ASPM_SUPPORT_MASK 0xc00
48 #define PCIE_RC_DL_MDIO_ADDR 0x1100
49 #define PCIE_RC_DL_MDIO_WR_DATA 0x1104
50 #define PCIE_RC_DL_MDIO_RD_DATA 0x1108
52 #define PCIE_MISC_MISC_CTRL 0x4008
53 #define PCIE_MISC_MISC_CTRL_SCB_ACCESS_EN_MASK 0x1000
54 #define PCIE_MISC_MISC_CTRL_CFG_READ_UR_MODE_MASK 0x2000
55 #define PCIE_MISC_MISC_CTRL_MAX_BURST_SIZE_MASK 0x300000
57 #define PCIE_MISC_MISC_CTRL_SCB0_SIZE_MASK 0xf8000000
58 #define PCIE_MISC_MISC_CTRL_SCB1_SIZE_MASK 0x07c00000
59 #define PCIE_MISC_MISC_CTRL_SCB2_SIZE_MASK 0x0000001f
60 #define SCB_SIZE_MASK(x) PCIE_MISC_MISC_CTRL_SCB ## x ## _SIZE_MASK
62 #define PCIE_MISC_CPU_2_PCIE_MEM_WIN0_LO 0x400c
63 #define PCIE_MEM_WIN0_LO(win) \
64 PCIE_MISC_CPU_2_PCIE_MEM_WIN0_LO + ((win) * 8)
66 #define PCIE_MISC_CPU_2_PCIE_MEM_WIN0_HI 0x4010
67 #define PCIE_MEM_WIN0_HI(win) \
68 PCIE_MISC_CPU_2_PCIE_MEM_WIN0_HI + ((win) * 8)
70 #define PCIE_MISC_RC_BAR1_CONFIG_LO 0x402c
71 #define PCIE_MISC_RC_BAR1_CONFIG_LO_SIZE_MASK 0x1f
73 #define PCIE_MISC_RC_BAR2_CONFIG_LO 0x4034
74 #define PCIE_MISC_RC_BAR2_CONFIG_LO_SIZE_MASK 0x1f
75 #define PCIE_MISC_RC_BAR2_CONFIG_HI 0x4038
77 #define PCIE_MISC_RC_BAR3_CONFIG_LO 0x403c
78 #define PCIE_MISC_RC_BAR3_CONFIG_LO_SIZE_MASK 0x1f
80 #define PCIE_MISC_MSI_BAR_CONFIG_LO 0x4044
81 #define PCIE_MISC_MSI_BAR_CONFIG_HI 0x4048
83 #define PCIE_MISC_MSI_DATA_CONFIG 0x404c
84 #define PCIE_MISC_MSI_DATA_CONFIG_VAL_32 0xffe06540
85 #define PCIE_MISC_MSI_DATA_CONFIG_VAL_8 0xfff86540
87 #define PCIE_MISC_PCIE_CTRL 0x4064
88 #define PCIE_MISC_PCIE_CTRL_PCIE_L23_REQUEST_MASK 0x1
89 #define PCIE_MISC_PCIE_CTRL_PCIE_PERSTB_MASK 0x4
91 #define PCIE_MISC_PCIE_STATUS 0x4068
92 #define PCIE_MISC_PCIE_STATUS_PCIE_PORT_MASK 0x80
93 #define PCIE_MISC_PCIE_STATUS_PCIE_DL_ACTIVE_MASK 0x20
94 #define PCIE_MISC_PCIE_STATUS_PCIE_PHYLINKUP_MASK 0x10
95 #define PCIE_MISC_PCIE_STATUS_PCIE_LINK_IN_L23_MASK 0x40
97 #define PCIE_MISC_REVISION 0x406c
98 #define BRCM_PCIE_HW_REV_33 0x0303
100 #define PCIE_MISC_CPU_2_PCIE_MEM_WIN0_BASE_LIMIT 0x4070
101 #define PCIE_MISC_CPU_2_PCIE_MEM_WIN0_BASE_LIMIT_LIMIT_MASK 0xfff00000
102 #define PCIE_MISC_CPU_2_PCIE_MEM_WIN0_BASE_LIMIT_BASE_MASK 0xfff0
103 #define PCIE_MEM_WIN0_BASE_LIMIT(win) \
104 PCIE_MISC_CPU_2_PCIE_MEM_WIN0_BASE_LIMIT + ((win) * 4)
106 #define PCIE_MISC_CPU_2_PCIE_MEM_WIN0_BASE_HI 0x4080
107 #define PCIE_MISC_CPU_2_PCIE_MEM_WIN0_BASE_HI_BASE_MASK 0xff
108 #define PCIE_MEM_WIN0_BASE_HI(win) \
109 PCIE_MISC_CPU_2_PCIE_MEM_WIN0_BASE_HI + ((win) * 8)
111 #define PCIE_MISC_CPU_2_PCIE_MEM_WIN0_LIMIT_HI 0x4084
112 #define PCIE_MISC_CPU_2_PCIE_MEM_WIN0_LIMIT_HI_LIMIT_MASK 0xff
113 #define PCIE_MEM_WIN0_LIMIT_HI(win) \
114 PCIE_MISC_CPU_2_PCIE_MEM_WIN0_LIMIT_HI + ((win) * 8)
116 #define PCIE_MISC_HARD_PCIE_HARD_DEBUG 0x4204
117 #define PCIE_MISC_HARD_PCIE_HARD_DEBUG_CLKREQ_DEBUG_ENABLE_MASK 0x2
118 #define PCIE_MISC_HARD_PCIE_HARD_DEBUG_SERDES_IDDQ_MASK 0x08000000
121 #define PCIE_INTR2_CPU_BASE 0x4300
122 #define PCIE_MSI_INTR2_BASE 0x4500
123 /* Offsets from PCIE_INTR2_CPU_BASE and PCIE_MSI_INTR2_BASE */
124 #define MSI_INT_STATUS 0x0
125 #define MSI_INT_CLR 0x8
126 #define MSI_INT_MASK_SET 0x10
127 #define MSI_INT_MASK_CLR 0x14
129 #define PCIE_EXT_CFG_DATA 0x8000
131 #define PCIE_EXT_CFG_INDEX 0x9000
132 #define PCIE_EXT_BUSNUM_SHIFT 20
133 #define PCIE_EXT_SLOT_SHIFT 15
134 #define PCIE_EXT_FUNC_SHIFT 12
136 #define PCIE_RGR1_SW_INIT_1_PERST_MASK 0x1
137 #define PCIE_RGR1_SW_INIT_1_PERST_SHIFT 0x0
139 #define RGR1_SW_INIT_1_INIT_GENERIC_MASK 0x2
140 #define RGR1_SW_INIT_1_INIT_GENERIC_SHIFT 0x1
141 #define RGR1_SW_INIT_1_INIT_7278_MASK 0x1
142 #define RGR1_SW_INIT_1_INIT_7278_SHIFT 0x0
144 /* PCIe parameters */
145 #define BRCM_NUM_PCIE_OUT_WINS 0x4
146 #define BRCM_INT_PCI_MSI_NR 32
147 #define BRCM_INT_PCI_MSI_LEGACY_NR 8
148 #define BRCM_INT_PCI_MSI_SHIFT 0
150 /* MSI target adresses */
151 #define BRCM_MSI_TARGET_ADDR_LT_4GB 0x0fffffffcULL
152 #define BRCM_MSI_TARGET_ADDR_GT_4GB 0xffffffffcULL
155 #define MDIO_PORT0 0x0
156 #define MDIO_DATA_MASK 0x7fffffff
157 #define MDIO_PORT_MASK 0xf0000
158 #define MDIO_REGAD_MASK 0xffff
159 #define MDIO_CMD_MASK 0xfff00000
160 #define MDIO_CMD_READ 0x1
161 #define MDIO_CMD_WRITE 0x0
162 #define MDIO_DATA_DONE_MASK 0x80000000
163 #define MDIO_RD_DONE(x) (((x) & MDIO_DATA_DONE_MASK) ? 1 : 0)
164 #define MDIO_WT_DONE(x) (((x) & MDIO_DATA_DONE_MASK) ? 0 : 1)
165 #define SSC_REGS_ADDR 0x1100
166 #define SET_ADDR_OFFSET 0x1f
167 #define SSC_CNTL_OFFSET 0x2
168 #define SSC_CNTL_OVRD_EN_MASK 0x8000
169 #define SSC_CNTL_OVRD_VAL_MASK 0x4000
170 #define SSC_STATUS_OFFSET 0x1
171 #define SSC_STATUS_SSC_MASK 0x400
172 #define SSC_STATUS_PLL_LOCK_MASK 0x800
173 #define PCIE_BRCM_MAX_MEMC 3
175 #define IDX_ADDR(pcie) (pcie->reg_offsets[EXT_CFG_INDEX])
176 #define DATA_ADDR(pcie) (pcie->reg_offsets[EXT_CFG_DATA])
177 #define PCIE_RGR1_SW_INIT_1(pcie) (pcie->reg_offsets[RGR1_SW_INIT_1])
179 /* Rescal registers */
180 #define PCIE_DVT_PMU_PCIE_PHY_CTRL 0xc700
181 #define PCIE_DVT_PMU_PCIE_PHY_CTRL_DAST_NFLDS 0x3
182 #define PCIE_DVT_PMU_PCIE_PHY_CTRL_DAST_DIG_RESET_MASK 0x4
183 #define PCIE_DVT_PMU_PCIE_PHY_CTRL_DAST_DIG_RESET_SHIFT 0x2
184 #define PCIE_DVT_PMU_PCIE_PHY_CTRL_DAST_RESET_MASK 0x2
185 #define PCIE_DVT_PMU_PCIE_PHY_CTRL_DAST_RESET_SHIFT 0x1
186 #define PCIE_DVT_PMU_PCIE_PHY_CTRL_DAST_PWRDN_MASK 0x1
187 #define PCIE_DVT_PMU_PCIE_PHY_CTRL_DAST_PWRDN_SHIFT 0x0
189 /* Forward declarations */
191 static inline void brcm_pcie_bridge_sw_init_set_7278(struct brcm_pcie *pcie, u32 val);
192 static inline void brcm_pcie_bridge_sw_init_set_generic(struct brcm_pcie *pcie, u32 val);
193 static inline void brcm_pcie_perst_set_7278(struct brcm_pcie *pcie, u32 val);
194 static inline void brcm_pcie_perst_set_generic(struct brcm_pcie *pcie, u32 val);
203 RGR1_SW_INIT_1_INIT_MASK,
204 RGR1_SW_INIT_1_INIT_SHIFT,
213 struct pcie_cfg_data {
215 const enum pcie_type type;
216 void (*perst_set)(struct brcm_pcie *pcie, u32 val);
217 void (*bridge_sw_init_set)(struct brcm_pcie *pcie, u32 val);
220 static const int pcie_offsets[] = {
221 [RGR1_SW_INIT_1] = 0x9210,
222 [EXT_CFG_INDEX] = 0x9000,
223 [EXT_CFG_DATA] = 0x9004,
226 static const struct pcie_cfg_data generic_cfg = {
227 .offsets = pcie_offsets,
229 .perst_set = brcm_pcie_perst_set_generic,
230 .bridge_sw_init_set = brcm_pcie_bridge_sw_init_set_generic,
233 static const int pcie_offset_bcm7278[] = {
234 [RGR1_SW_INIT_1] = 0xc010,
235 [EXT_CFG_INDEX] = 0x9000,
236 [EXT_CFG_DATA] = 0x9004,
239 static const struct pcie_cfg_data bcm7278_cfg = {
240 .offsets = pcie_offset_bcm7278,
242 .perst_set = brcm_pcie_perst_set_7278,
243 .bridge_sw_init_set = brcm_pcie_bridge_sw_init_set_7278,
246 static const struct pcie_cfg_data bcm2711_cfg = {
247 .offsets = pcie_offsets,
249 .perst_set = brcm_pcie_perst_set_generic,
250 .bridge_sw_init_set = brcm_pcie_bridge_sw_init_set_generic,
256 struct device_node *np;
257 struct irq_domain *msi_domain;
258 struct irq_domain *inner_domain;
259 struct mutex lock; /* guards the alloc/free operations */
262 /* used indicates which MSI interrupts have been alloc'd */
265 /* Some chips have MSIs in bits [31..24] of a shared register. */
267 int nr; /* No. of MSI available, depends on chip */
268 /* This is the base pointer for interrupt status/set/clr regs */
269 void __iomem *intr_base;
272 /* Internal PCIe Host Controller Information.*/
277 struct device_node *np;
281 struct brcm_msi *msi;
282 const int *reg_offsets;
284 struct reset_control *rescal;
286 u64 memc_size[PCIE_BRCM_MAX_MEMC];
288 void (*perst_set)(struct brcm_pcie *pcie, u32 val);
289 void (*bridge_sw_init_set)(struct brcm_pcie *pcie, u32 val);
293 * This is to convert the size of the inbound "BAR" region to the
294 * non-linear values of PCIE_X_MISC_RC_BAR[123]_CONFIG_LO.SIZE
296 static int brcm_pcie_encode_ibar_size(u64 size)
298 int log2_in = ilog2(size);
300 if (log2_in >= 12 && log2_in <= 15)
301 /* Covers 4KB to 32KB (inclusive) */
302 return (log2_in - 12) + 0x1c;
303 else if (log2_in >= 16 && log2_in <= 35)
304 /* Covers 64KB to 32GB, (inclusive) */
306 /* Something is awry so disable */
310 static u32 brcm_pcie_mdio_form_pkt(int port, int regad, int cmd)
314 pkt |= FIELD_PREP(MDIO_PORT_MASK, port);
315 pkt |= FIELD_PREP(MDIO_REGAD_MASK, regad);
316 pkt |= FIELD_PREP(MDIO_CMD_MASK, cmd);
321 /* negative return value indicates error */
322 static int brcm_pcie_mdio_read(void __iomem *base, u8 port, u8 regad, u32 *val)
327 writel(brcm_pcie_mdio_form_pkt(port, regad, MDIO_CMD_READ),
328 base + PCIE_RC_DL_MDIO_ADDR);
329 readl(base + PCIE_RC_DL_MDIO_ADDR);
331 data = readl(base + PCIE_RC_DL_MDIO_RD_DATA);
332 for (tries = 0; !MDIO_RD_DONE(data) && tries < 10; tries++) {
334 data = readl(base + PCIE_RC_DL_MDIO_RD_DATA);
337 *val = FIELD_GET(MDIO_DATA_MASK, data);
338 return MDIO_RD_DONE(data) ? 0 : -EIO;
341 /* negative return value indicates error */
342 static int brcm_pcie_mdio_write(void __iomem *base, u8 port,
343 u8 regad, u16 wrdata)
348 writel(brcm_pcie_mdio_form_pkt(port, regad, MDIO_CMD_WRITE),
349 base + PCIE_RC_DL_MDIO_ADDR);
350 readl(base + PCIE_RC_DL_MDIO_ADDR);
351 writel(MDIO_DATA_DONE_MASK | wrdata, base + PCIE_RC_DL_MDIO_WR_DATA);
353 data = readl(base + PCIE_RC_DL_MDIO_WR_DATA);
354 for (tries = 0; !MDIO_WT_DONE(data) && tries < 10; tries++) {
356 data = readl(base + PCIE_RC_DL_MDIO_WR_DATA);
359 return MDIO_WT_DONE(data) ? 0 : -EIO;
363 * Configures device for Spread Spectrum Clocking (SSC) mode; a negative
364 * return value indicates error.
366 static int brcm_pcie_set_ssc(struct brcm_pcie *pcie)
372 ret = brcm_pcie_mdio_write(pcie->base, MDIO_PORT0, SET_ADDR_OFFSET,
377 ret = brcm_pcie_mdio_read(pcie->base, MDIO_PORT0,
378 SSC_CNTL_OFFSET, &tmp);
382 u32p_replace_bits(&tmp, 1, SSC_CNTL_OVRD_EN_MASK);
383 u32p_replace_bits(&tmp, 1, SSC_CNTL_OVRD_VAL_MASK);
384 ret = brcm_pcie_mdio_write(pcie->base, MDIO_PORT0,
385 SSC_CNTL_OFFSET, tmp);
389 usleep_range(1000, 2000);
390 ret = brcm_pcie_mdio_read(pcie->base, MDIO_PORT0,
391 SSC_STATUS_OFFSET, &tmp);
395 ssc = FIELD_GET(SSC_STATUS_SSC_MASK, tmp);
396 pll = FIELD_GET(SSC_STATUS_PLL_LOCK_MASK, tmp);
398 return ssc && pll ? 0 : -EIO;
401 /* Limits operation to a specific generation (1, 2, or 3) */
402 static void brcm_pcie_set_gen(struct brcm_pcie *pcie, int gen)
404 u16 lnkctl2 = readw(pcie->base + BRCM_PCIE_CAP_REGS + PCI_EXP_LNKCTL2);
405 u32 lnkcap = readl(pcie->base + BRCM_PCIE_CAP_REGS + PCI_EXP_LNKCAP);
407 lnkcap = (lnkcap & ~PCI_EXP_LNKCAP_SLS) | gen;
408 writel(lnkcap, pcie->base + BRCM_PCIE_CAP_REGS + PCI_EXP_LNKCAP);
410 lnkctl2 = (lnkctl2 & ~0xf) | gen;
411 writew(lnkctl2, pcie->base + BRCM_PCIE_CAP_REGS + PCI_EXP_LNKCTL2);
414 static void brcm_pcie_set_outbound_win(struct brcm_pcie *pcie,
415 unsigned int win, u64 cpu_addr,
416 u64 pcie_addr, u64 size)
418 u32 cpu_addr_mb_high, limit_addr_mb_high;
419 phys_addr_t cpu_addr_mb, limit_addr_mb;
423 /* Set the base of the pcie_addr window */
424 writel(lower_32_bits(pcie_addr), pcie->base + PCIE_MEM_WIN0_LO(win));
425 writel(upper_32_bits(pcie_addr), pcie->base + PCIE_MEM_WIN0_HI(win));
427 /* Write the addr base & limit lower bits (in MBs) */
428 cpu_addr_mb = cpu_addr / SZ_1M;
429 limit_addr_mb = (cpu_addr + size - 1) / SZ_1M;
431 tmp = readl(pcie->base + PCIE_MEM_WIN0_BASE_LIMIT(win));
432 u32p_replace_bits(&tmp, cpu_addr_mb,
433 PCIE_MISC_CPU_2_PCIE_MEM_WIN0_BASE_LIMIT_BASE_MASK);
434 u32p_replace_bits(&tmp, limit_addr_mb,
435 PCIE_MISC_CPU_2_PCIE_MEM_WIN0_BASE_LIMIT_LIMIT_MASK);
436 writel(tmp, pcie->base + PCIE_MEM_WIN0_BASE_LIMIT(win));
438 /* Write the cpu & limit addr upper bits */
440 HWEIGHT32(PCIE_MISC_CPU_2_PCIE_MEM_WIN0_BASE_LIMIT_BASE_MASK);
442 cpu_addr_mb_high = cpu_addr_mb >> high_addr_shift;
443 tmp = readl(pcie->base + PCIE_MEM_WIN0_BASE_HI(win));
444 u32p_replace_bits(&tmp, cpu_addr_mb_high,
445 PCIE_MISC_CPU_2_PCIE_MEM_WIN0_BASE_HI_BASE_MASK);
446 writel(tmp, pcie->base + PCIE_MEM_WIN0_BASE_HI(win));
448 limit_addr_mb_high = limit_addr_mb >> high_addr_shift;
449 tmp = readl(pcie->base + PCIE_MEM_WIN0_LIMIT_HI(win));
450 u32p_replace_bits(&tmp, limit_addr_mb_high,
451 PCIE_MISC_CPU_2_PCIE_MEM_WIN0_LIMIT_HI_LIMIT_MASK);
452 writel(tmp, pcie->base + PCIE_MEM_WIN0_LIMIT_HI(win));
455 static struct irq_chip brcm_msi_irq_chip = {
456 .name = "BRCM STB PCIe MSI",
457 .irq_ack = irq_chip_ack_parent,
458 .irq_mask = pci_msi_mask_irq,
459 .irq_unmask = pci_msi_unmask_irq,
462 static struct msi_domain_info brcm_msi_domain_info = {
463 /* Multi MSI is supported by the controller, but not by this driver */
464 .flags = (MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS),
465 .chip = &brcm_msi_irq_chip,
468 static void brcm_pcie_msi_isr(struct irq_desc *desc)
470 struct irq_chip *chip = irq_desc_get_chip(desc);
471 unsigned long status, virq;
472 struct brcm_msi *msi;
476 chained_irq_enter(chip, desc);
477 msi = irq_desc_get_handler_data(desc);
480 status = readl(msi->intr_base + MSI_INT_STATUS);
481 status >>= msi->legacy_shift;
483 for_each_set_bit(bit, &status, msi->nr) {
484 virq = irq_find_mapping(msi->inner_domain, bit);
486 generic_handle_irq(virq);
488 dev_dbg(dev, "unexpected MSI\n");
491 chained_irq_exit(chip, desc);
494 static void brcm_msi_compose_msi_msg(struct irq_data *data, struct msi_msg *msg)
496 struct brcm_msi *msi = irq_data_get_irq_chip_data(data);
498 msg->address_lo = lower_32_bits(msi->target_addr);
499 msg->address_hi = upper_32_bits(msi->target_addr);
500 msg->data = (0xffff & PCIE_MISC_MSI_DATA_CONFIG_VAL_32) | data->hwirq;
503 static int brcm_msi_set_affinity(struct irq_data *irq_data,
504 const struct cpumask *mask, bool force)
509 static void brcm_msi_ack_irq(struct irq_data *data)
511 struct brcm_msi *msi = irq_data_get_irq_chip_data(data);
512 const int shift_amt = data->hwirq + msi->legacy_shift;
514 writel(1 << shift_amt, msi->intr_base + MSI_INT_CLR);
518 static struct irq_chip brcm_msi_bottom_irq_chip = {
519 .name = "BRCM STB MSI",
520 .irq_compose_msi_msg = brcm_msi_compose_msi_msg,
521 .irq_set_affinity = brcm_msi_set_affinity,
522 .irq_ack = brcm_msi_ack_irq,
525 static int brcm_msi_alloc(struct brcm_msi *msi)
529 mutex_lock(&msi->lock);
530 hwirq = bitmap_find_free_region(&msi->used, msi->nr, 0);
531 mutex_unlock(&msi->lock);
536 static void brcm_msi_free(struct brcm_msi *msi, unsigned long hwirq)
538 mutex_lock(&msi->lock);
539 bitmap_release_region(&msi->used, hwirq, 0);
540 mutex_unlock(&msi->lock);
543 static int brcm_irq_domain_alloc(struct irq_domain *domain, unsigned int virq,
544 unsigned int nr_irqs, void *args)
546 struct brcm_msi *msi = domain->host_data;
549 hwirq = brcm_msi_alloc(msi);
554 irq_domain_set_info(domain, virq, (irq_hw_number_t)hwirq,
555 &brcm_msi_bottom_irq_chip, domain->host_data,
556 handle_edge_irq, NULL, NULL);
560 static void brcm_irq_domain_free(struct irq_domain *domain,
561 unsigned int virq, unsigned int nr_irqs)
563 struct irq_data *d = irq_domain_get_irq_data(domain, virq);
564 struct brcm_msi *msi = irq_data_get_irq_chip_data(d);
566 brcm_msi_free(msi, d->hwirq);
569 static const struct irq_domain_ops msi_domain_ops = {
570 .alloc = brcm_irq_domain_alloc,
571 .free = brcm_irq_domain_free,
574 static int brcm_allocate_domains(struct brcm_msi *msi)
576 struct fwnode_handle *fwnode = of_node_to_fwnode(msi->np);
577 struct device *dev = msi->dev;
579 msi->inner_domain = irq_domain_add_linear(NULL, msi->nr, &msi_domain_ops, msi);
580 if (!msi->inner_domain) {
581 dev_err(dev, "failed to create IRQ domain\n");
585 msi->msi_domain = pci_msi_create_irq_domain(fwnode,
586 &brcm_msi_domain_info,
588 if (!msi->msi_domain) {
589 dev_err(dev, "failed to create MSI domain\n");
590 irq_domain_remove(msi->inner_domain);
597 static void brcm_free_domains(struct brcm_msi *msi)
599 irq_domain_remove(msi->msi_domain);
600 irq_domain_remove(msi->inner_domain);
603 static void brcm_msi_remove(struct brcm_pcie *pcie)
605 struct brcm_msi *msi = pcie->msi;
609 irq_set_chained_handler(msi->irq, NULL);
610 irq_set_handler_data(msi->irq, NULL);
611 brcm_free_domains(msi);
614 static void brcm_msi_set_regs(struct brcm_msi *msi)
616 u32 val = __GENMASK(31, msi->legacy_shift);
618 writel(val, msi->intr_base + MSI_INT_MASK_CLR);
619 writel(val, msi->intr_base + MSI_INT_CLR);
622 * The 0 bit of PCIE_MISC_MSI_BAR_CONFIG_LO is repurposed to MSI
623 * enable, which we set to 1.
625 writel(lower_32_bits(msi->target_addr) | 0x1,
626 msi->base + PCIE_MISC_MSI_BAR_CONFIG_LO);
627 writel(upper_32_bits(msi->target_addr),
628 msi->base + PCIE_MISC_MSI_BAR_CONFIG_HI);
630 val = msi->legacy ? PCIE_MISC_MSI_DATA_CONFIG_VAL_8 : PCIE_MISC_MSI_DATA_CONFIG_VAL_32;
631 writel(val, msi->base + PCIE_MISC_MSI_DATA_CONFIG);
634 static int brcm_pcie_enable_msi(struct brcm_pcie *pcie)
636 struct brcm_msi *msi;
638 struct device *dev = pcie->dev;
640 irq = irq_of_parse_and_map(dev->of_node, 1);
642 dev_err(dev, "cannot map MSI interrupt\n");
646 msi = devm_kzalloc(dev, sizeof(struct brcm_msi), GFP_KERNEL);
650 mutex_init(&msi->lock);
652 msi->base = pcie->base;
654 msi->target_addr = pcie->msi_target_addr;
656 msi->legacy = pcie->hw_rev < BRCM_PCIE_HW_REV_33;
659 msi->intr_base = msi->base + PCIE_INTR2_CPU_BASE;
660 msi->nr = BRCM_INT_PCI_MSI_LEGACY_NR;
661 msi->legacy_shift = 24;
663 msi->intr_base = msi->base + PCIE_MSI_INTR2_BASE;
664 msi->nr = BRCM_INT_PCI_MSI_NR;
665 msi->legacy_shift = 0;
668 ret = brcm_allocate_domains(msi);
672 irq_set_chained_handler_and_data(msi->irq, brcm_pcie_msi_isr, msi);
674 brcm_msi_set_regs(msi);
680 /* The controller is capable of serving in both RC and EP roles */
681 static bool brcm_pcie_rc_mode(struct brcm_pcie *pcie)
683 void __iomem *base = pcie->base;
684 u32 val = readl(base + PCIE_MISC_PCIE_STATUS);
686 return !!FIELD_GET(PCIE_MISC_PCIE_STATUS_PCIE_PORT_MASK, val);
689 static bool brcm_pcie_link_up(struct brcm_pcie *pcie)
691 u32 val = readl(pcie->base + PCIE_MISC_PCIE_STATUS);
692 u32 dla = FIELD_GET(PCIE_MISC_PCIE_STATUS_PCIE_DL_ACTIVE_MASK, val);
693 u32 plu = FIELD_GET(PCIE_MISC_PCIE_STATUS_PCIE_PHYLINKUP_MASK, val);
698 /* Configuration space read/write support */
699 static inline int brcm_pcie_cfg_index(int busnr, int devfn, int reg)
701 return ((PCI_SLOT(devfn) & 0x1f) << PCIE_EXT_SLOT_SHIFT)
702 | ((PCI_FUNC(devfn) & 0x07) << PCIE_EXT_FUNC_SHIFT)
703 | (busnr << PCIE_EXT_BUSNUM_SHIFT)
707 static void __iomem *brcm_pcie_map_conf(struct pci_bus *bus, unsigned int devfn,
710 struct brcm_pcie *pcie = bus->sysdata;
711 void __iomem *base = pcie->base;
714 /* Accesses to the RC go right to the RC registers if slot==0 */
715 if (pci_is_root_bus(bus))
716 return PCI_SLOT(devfn) ? NULL : base + where;
718 /* For devices, write to the config space index register */
719 idx = brcm_pcie_cfg_index(bus->number, devfn, 0);
720 writel(idx, pcie->base + PCIE_EXT_CFG_INDEX);
721 return base + PCIE_EXT_CFG_DATA + where;
724 static struct pci_ops brcm_pcie_ops = {
725 .map_bus = brcm_pcie_map_conf,
726 .read = pci_generic_config_read,
727 .write = pci_generic_config_write,
730 static inline void brcm_pcie_bridge_sw_init_set_generic(struct brcm_pcie *pcie, u32 val)
732 u32 tmp, mask = RGR1_SW_INIT_1_INIT_GENERIC_MASK;
733 u32 shift = RGR1_SW_INIT_1_INIT_GENERIC_SHIFT;
735 tmp = readl(pcie->base + PCIE_RGR1_SW_INIT_1(pcie));
736 tmp = (tmp & ~mask) | ((val << shift) & mask);
737 writel(tmp, pcie->base + PCIE_RGR1_SW_INIT_1(pcie));
740 static inline void brcm_pcie_bridge_sw_init_set_7278(struct brcm_pcie *pcie, u32 val)
742 u32 tmp, mask = RGR1_SW_INIT_1_INIT_7278_MASK;
743 u32 shift = RGR1_SW_INIT_1_INIT_7278_SHIFT;
745 tmp = readl(pcie->base + PCIE_RGR1_SW_INIT_1(pcie));
746 tmp = (tmp & ~mask) | ((val << shift) & mask);
747 writel(tmp, pcie->base + PCIE_RGR1_SW_INIT_1(pcie));
750 static inline void brcm_pcie_perst_set_7278(struct brcm_pcie *pcie, u32 val)
754 /* Perst bit has moved and assert value is 0 */
755 tmp = readl(pcie->base + PCIE_MISC_PCIE_CTRL);
756 u32p_replace_bits(&tmp, !val, PCIE_MISC_PCIE_CTRL_PCIE_PERSTB_MASK);
757 writel(tmp, pcie->base + PCIE_MISC_PCIE_CTRL);
760 static inline void brcm_pcie_perst_set_generic(struct brcm_pcie *pcie, u32 val)
764 tmp = readl(pcie->base + PCIE_RGR1_SW_INIT_1(pcie));
765 u32p_replace_bits(&tmp, val, PCIE_RGR1_SW_INIT_1_PERST_MASK);
766 writel(tmp, pcie->base + PCIE_RGR1_SW_INIT_1(pcie));
769 static inline int brcm_pcie_get_rc_bar2_size_and_offset(struct brcm_pcie *pcie,
773 struct pci_host_bridge *bridge = pci_host_bridge_from_priv(pcie);
774 struct resource_entry *entry;
775 struct device *dev = pcie->dev;
776 u64 lowest_pcie_addr = ~(u64)0;
780 resource_list_for_each_entry(entry, &bridge->dma_ranges) {
781 u64 pcie_beg = entry->res->start - entry->offset;
783 size += entry->res->end - entry->res->start + 1;
784 if (pcie_beg < lowest_pcie_addr)
785 lowest_pcie_addr = pcie_beg;
788 if (lowest_pcie_addr == ~(u64)0) {
789 dev_err(dev, "DT node has no dma-ranges\n");
793 ret = of_property_read_variable_u64_array(pcie->np, "brcm,scb-sizes", pcie->memc_size, 1,
797 /* Make an educated guess */
799 pcie->memc_size[0] = 1ULL << fls64(size - 1);
801 pcie->num_memc = ret;
804 /* Each memc is viewed through a "port" that is a power of 2 */
805 for (i = 0, size = 0; i < pcie->num_memc; i++)
806 size += pcie->memc_size[i];
808 /* System memory starts at this address in PCIe-space */
809 *rc_bar2_offset = lowest_pcie_addr;
810 /* The sum of all memc views must also be a power of 2 */
811 *rc_bar2_size = 1ULL << fls64(size - 1);
814 * We validate the inbound memory view even though we should trust
815 * whatever the device-tree provides. This is because of an HW issue on
816 * early Raspberry Pi 4's revisions (bcm2711). It turns out its
817 * firmware has to dynamically edit dma-ranges due to a bug on the
818 * PCIe controller integration, which prohibits any access above the
819 * lower 3GB of memory. Given this, we decided to keep the dma-ranges
820 * in check, avoiding hard to debug device-tree related issues in the
823 * The PCIe host controller by design must set the inbound viewport to
824 * be a contiguous arrangement of all of the system's memory. In
825 * addition, its size mut be a power of two. To further complicate
826 * matters, the viewport must start on a pcie-address that is aligned
827 * on a multiple of its size. If a portion of the viewport does not
828 * represent system memory -- e.g. 3GB of memory requires a 4GB
829 * viewport -- we can map the outbound memory in or after 3GB and even
830 * though the viewport will overlap the outbound memory the controller
831 * will know to send outbound memory downstream and everything else
836 * - The best-case scenario, memory up to 3GB, is to place the inbound
837 * region in the first 4GB of pcie-space, as some legacy devices can
838 * only address 32bits. We would also like to put the MSI under 4GB
839 * as well, since some devices require a 32bit MSI target address.
841 * - If the system memory is 4GB or larger we cannot start the inbound
842 * region at location 0 (since we have to allow some space for
843 * outbound memory @ 3GB). So instead it will start at the 1x
844 * multiple of its size
846 if (!*rc_bar2_size || (*rc_bar2_offset & (*rc_bar2_size - 1)) ||
847 (*rc_bar2_offset < SZ_4G && *rc_bar2_offset > SZ_2G)) {
848 dev_err(dev, "Invalid rc_bar2_offset/size: size 0x%llx, off 0x%llx\n",
849 *rc_bar2_size, *rc_bar2_offset);
856 static int brcm_pcie_setup(struct brcm_pcie *pcie)
858 struct pci_host_bridge *bridge = pci_host_bridge_from_priv(pcie);
859 u64 rc_bar2_offset, rc_bar2_size;
860 void __iomem *base = pcie->base;
861 struct device *dev = pcie->dev;
862 struct resource_entry *entry;
863 bool ssc_good = false;
864 struct resource *res;
865 int num_out_wins = 0;
866 u16 nlw, cls, lnksta;
868 u32 tmp, burst, aspm_support;
870 /* Reset the bridge */
871 pcie->bridge_sw_init_set(pcie, 1);
872 usleep_range(100, 200);
874 /* Take the bridge out of reset */
875 pcie->bridge_sw_init_set(pcie, 0);
877 tmp = readl(base + PCIE_MISC_HARD_PCIE_HARD_DEBUG);
878 tmp &= ~PCIE_MISC_HARD_PCIE_HARD_DEBUG_SERDES_IDDQ_MASK;
879 writel(tmp, base + PCIE_MISC_HARD_PCIE_HARD_DEBUG);
880 /* Wait for SerDes to be stable */
881 usleep_range(100, 200);
884 * SCB_MAX_BURST_SIZE is a two bit field. For GENERIC chips it
885 * is encoded as 0=128, 1=256, 2=512, 3=Rsvd, for BCM7278 it
886 * is encoded as 0=Rsvd, 1=128, 2=256, 3=512.
888 if (pcie->type == BCM2711)
889 burst = 0x0; /* 128B */
890 else if (pcie->type == BCM7278)
891 burst = 0x3; /* 512 bytes */
893 burst = 0x2; /* 512 bytes */
895 /* Set SCB_MAX_BURST_SIZE, CFG_READ_UR_MODE, SCB_ACCESS_EN */
896 u32p_replace_bits(&tmp, 1, PCIE_MISC_MISC_CTRL_SCB_ACCESS_EN_MASK);
897 u32p_replace_bits(&tmp, 1, PCIE_MISC_MISC_CTRL_CFG_READ_UR_MODE_MASK);
898 u32p_replace_bits(&tmp, burst, PCIE_MISC_MISC_CTRL_MAX_BURST_SIZE_MASK);
899 writel(tmp, base + PCIE_MISC_MISC_CTRL);
901 ret = brcm_pcie_get_rc_bar2_size_and_offset(pcie, &rc_bar2_size,
906 tmp = lower_32_bits(rc_bar2_offset);
907 u32p_replace_bits(&tmp, brcm_pcie_encode_ibar_size(rc_bar2_size),
908 PCIE_MISC_RC_BAR2_CONFIG_LO_SIZE_MASK);
909 writel(tmp, base + PCIE_MISC_RC_BAR2_CONFIG_LO);
910 writel(upper_32_bits(rc_bar2_offset),
911 base + PCIE_MISC_RC_BAR2_CONFIG_HI);
913 tmp = readl(base + PCIE_MISC_MISC_CTRL);
914 for (memc = 0; memc < pcie->num_memc; memc++) {
915 u32 scb_size_val = ilog2(pcie->memc_size[memc]) - 15;
918 u32p_replace_bits(&tmp, scb_size_val, SCB_SIZE_MASK(0));
920 u32p_replace_bits(&tmp, scb_size_val, SCB_SIZE_MASK(1));
922 u32p_replace_bits(&tmp, scb_size_val, SCB_SIZE_MASK(2));
924 writel(tmp, base + PCIE_MISC_MISC_CTRL);
927 * We ideally want the MSI target address to be located in the 32bit
928 * addressable memory area. Some devices might depend on it. This is
929 * possible either when the inbound window is located above the lower
930 * 4GB or when the inbound area is smaller than 4GB (taking into
931 * account the rounding-up we're forced to perform).
933 if (rc_bar2_offset >= SZ_4G || (rc_bar2_size + rc_bar2_offset) < SZ_4G)
934 pcie->msi_target_addr = BRCM_MSI_TARGET_ADDR_LT_4GB;
936 pcie->msi_target_addr = BRCM_MSI_TARGET_ADDR_GT_4GB;
938 /* disable the PCIe->GISB memory window (RC_BAR1) */
939 tmp = readl(base + PCIE_MISC_RC_BAR1_CONFIG_LO);
940 tmp &= ~PCIE_MISC_RC_BAR1_CONFIG_LO_SIZE_MASK;
941 writel(tmp, base + PCIE_MISC_RC_BAR1_CONFIG_LO);
943 /* disable the PCIe->SCB memory window (RC_BAR3) */
944 tmp = readl(base + PCIE_MISC_RC_BAR3_CONFIG_LO);
945 tmp &= ~PCIE_MISC_RC_BAR3_CONFIG_LO_SIZE_MASK;
946 writel(tmp, base + PCIE_MISC_RC_BAR3_CONFIG_LO);
949 brcm_pcie_set_gen(pcie, pcie->gen);
951 /* Unassert the fundamental reset */
952 pcie->perst_set(pcie, 0);
955 * Give the RC/EP time to wake up, before trying to configure RC.
956 * Intermittently check status for link-up, up to a total of 100ms.
958 for (i = 0; i < 100 && !brcm_pcie_link_up(pcie); i += 5)
961 if (!brcm_pcie_link_up(pcie)) {
962 dev_err(dev, "link down\n");
966 if (!brcm_pcie_rc_mode(pcie)) {
967 dev_err(dev, "PCIe misconfigured; is in EP mode\n");
971 resource_list_for_each_entry(entry, &bridge->windows) {
974 if (resource_type(res) != IORESOURCE_MEM)
977 if (num_out_wins >= BRCM_NUM_PCIE_OUT_WINS) {
978 dev_err(pcie->dev, "too many outbound wins\n");
982 brcm_pcie_set_outbound_win(pcie, num_out_wins, res->start,
983 res->start - entry->offset,
988 /* Don't advertise L0s capability if 'aspm-no-l0s' */
989 aspm_support = PCIE_LINK_STATE_L1;
990 if (!of_property_read_bool(pcie->np, "aspm-no-l0s"))
991 aspm_support |= PCIE_LINK_STATE_L0S;
992 tmp = readl(base + PCIE_RC_CFG_PRIV1_LINK_CAPABILITY);
993 u32p_replace_bits(&tmp, aspm_support,
994 PCIE_RC_CFG_PRIV1_LINK_CAPABILITY_ASPM_SUPPORT_MASK);
995 writel(tmp, base + PCIE_RC_CFG_PRIV1_LINK_CAPABILITY);
998 * For config space accesses on the RC, show the right class for
999 * a PCIe-PCIe bridge (the default setting is to be EP mode).
1001 tmp = readl(base + PCIE_RC_CFG_PRIV1_ID_VAL3);
1002 u32p_replace_bits(&tmp, 0x060400,
1003 PCIE_RC_CFG_PRIV1_ID_VAL3_CLASS_CODE_MASK);
1004 writel(tmp, base + PCIE_RC_CFG_PRIV1_ID_VAL3);
1007 ret = brcm_pcie_set_ssc(pcie);
1011 dev_err(dev, "failed attempt to enter ssc mode\n");
1014 lnksta = readw(base + BRCM_PCIE_CAP_REGS + PCI_EXP_LNKSTA);
1015 cls = FIELD_GET(PCI_EXP_LNKSTA_CLS, lnksta);
1016 nlw = FIELD_GET(PCI_EXP_LNKSTA_NLW, lnksta);
1017 dev_info(dev, "link up, %s x%u %s\n",
1018 pci_speed_string(pcie_link_speed[cls]), nlw,
1019 ssc_good ? "(SSC)" : "(!SSC)");
1021 /* PCIe->SCB endian mode for BAR */
1022 tmp = readl(base + PCIE_RC_CFG_VENDOR_VENDOR_SPECIFIC_REG1);
1023 u32p_replace_bits(&tmp, PCIE_RC_CFG_VENDOR_SPCIFIC_REG1_LITTLE_ENDIAN,
1024 PCIE_RC_CFG_VENDOR_VENDOR_SPECIFIC_REG1_ENDIAN_MODE_BAR2_MASK);
1025 writel(tmp, base + PCIE_RC_CFG_VENDOR_VENDOR_SPECIFIC_REG1);
1028 * Refclk from RC should be gated with CLKREQ# input when ASPM L0s,L1
1029 * is enabled => setting the CLKREQ_DEBUG_ENABLE field to 1.
1031 tmp = readl(base + PCIE_MISC_HARD_PCIE_HARD_DEBUG);
1032 tmp |= PCIE_MISC_HARD_PCIE_HARD_DEBUG_CLKREQ_DEBUG_ENABLE_MASK;
1033 writel(tmp, base + PCIE_MISC_HARD_PCIE_HARD_DEBUG);
1038 /* L23 is a low-power PCIe link state */
1039 static void brcm_pcie_enter_l23(struct brcm_pcie *pcie)
1041 void __iomem *base = pcie->base;
1045 /* Assert request for L23 */
1046 tmp = readl(base + PCIE_MISC_PCIE_CTRL);
1047 u32p_replace_bits(&tmp, 1, PCIE_MISC_PCIE_CTRL_PCIE_L23_REQUEST_MASK);
1048 writel(tmp, base + PCIE_MISC_PCIE_CTRL);
1050 /* Wait up to 36 msec for L23 */
1051 tmp = readl(base + PCIE_MISC_PCIE_STATUS);
1052 l23 = FIELD_GET(PCIE_MISC_PCIE_STATUS_PCIE_LINK_IN_L23_MASK, tmp);
1053 for (i = 0; i < 15 && !l23; i++) {
1054 usleep_range(2000, 2400);
1055 tmp = readl(base + PCIE_MISC_PCIE_STATUS);
1056 l23 = FIELD_GET(PCIE_MISC_PCIE_STATUS_PCIE_LINK_IN_L23_MASK,
1061 dev_err(pcie->dev, "failed to enter low-power link state\n");
1064 static int brcm_phy_cntl(struct brcm_pcie *pcie, const int start)
1066 static const u32 shifts[PCIE_DVT_PMU_PCIE_PHY_CTRL_DAST_NFLDS] = {
1067 PCIE_DVT_PMU_PCIE_PHY_CTRL_DAST_PWRDN_SHIFT,
1068 PCIE_DVT_PMU_PCIE_PHY_CTRL_DAST_RESET_SHIFT,
1069 PCIE_DVT_PMU_PCIE_PHY_CTRL_DAST_DIG_RESET_SHIFT,};
1070 static const u32 masks[PCIE_DVT_PMU_PCIE_PHY_CTRL_DAST_NFLDS] = {
1071 PCIE_DVT_PMU_PCIE_PHY_CTRL_DAST_PWRDN_MASK,
1072 PCIE_DVT_PMU_PCIE_PHY_CTRL_DAST_RESET_MASK,
1073 PCIE_DVT_PMU_PCIE_PHY_CTRL_DAST_DIG_RESET_MASK,};
1074 const int beg = start ? 0 : PCIE_DVT_PMU_PCIE_PHY_CTRL_DAST_NFLDS - 1;
1075 const int end = start ? PCIE_DVT_PMU_PCIE_PHY_CTRL_DAST_NFLDS : -1;
1076 u32 tmp, combined_mask = 0;
1078 void __iomem *base = pcie->base;
1081 for (i = beg; i != end; start ? i++ : i--) {
1082 val = start ? BIT_MASK(shifts[i]) : 0;
1083 tmp = readl(base + PCIE_DVT_PMU_PCIE_PHY_CTRL);
1084 tmp = (tmp & ~masks[i]) | (val & masks[i]);
1085 writel(tmp, base + PCIE_DVT_PMU_PCIE_PHY_CTRL);
1086 usleep_range(50, 200);
1087 combined_mask |= masks[i];
1090 tmp = readl(base + PCIE_DVT_PMU_PCIE_PHY_CTRL);
1091 val = start ? combined_mask : 0;
1093 ret = (tmp & combined_mask) == val ? 0 : -EIO;
1095 dev_err(pcie->dev, "failed to %s phy\n", (start ? "start" : "stop"));
1100 static inline int brcm_phy_start(struct brcm_pcie *pcie)
1102 return pcie->rescal ? brcm_phy_cntl(pcie, 1) : 0;
1105 static inline int brcm_phy_stop(struct brcm_pcie *pcie)
1107 return pcie->rescal ? brcm_phy_cntl(pcie, 0) : 0;
1110 static void brcm_pcie_turn_off(struct brcm_pcie *pcie)
1112 void __iomem *base = pcie->base;
1115 if (brcm_pcie_link_up(pcie))
1116 brcm_pcie_enter_l23(pcie);
1117 /* Assert fundamental reset */
1118 pcie->perst_set(pcie, 1);
1120 /* Deassert request for L23 in case it was asserted */
1121 tmp = readl(base + PCIE_MISC_PCIE_CTRL);
1122 u32p_replace_bits(&tmp, 0, PCIE_MISC_PCIE_CTRL_PCIE_L23_REQUEST_MASK);
1123 writel(tmp, base + PCIE_MISC_PCIE_CTRL);
1125 /* Turn off SerDes */
1126 tmp = readl(base + PCIE_MISC_HARD_PCIE_HARD_DEBUG);
1127 u32p_replace_bits(&tmp, 1, PCIE_MISC_HARD_PCIE_HARD_DEBUG_SERDES_IDDQ_MASK);
1128 writel(tmp, base + PCIE_MISC_HARD_PCIE_HARD_DEBUG);
1130 /* Shutdown PCIe bridge */
1131 pcie->bridge_sw_init_set(pcie, 1);
1134 static int brcm_pcie_suspend(struct device *dev)
1136 struct brcm_pcie *pcie = dev_get_drvdata(dev);
1139 brcm_pcie_turn_off(pcie);
1140 ret = brcm_phy_stop(pcie);
1141 clk_disable_unprepare(pcie->clk);
1146 static int brcm_pcie_resume(struct device *dev)
1148 struct brcm_pcie *pcie = dev_get_drvdata(dev);
1154 clk_prepare_enable(pcie->clk);
1156 ret = brcm_phy_start(pcie);
1160 /* Take bridge out of reset so we can access the SERDES reg */
1161 pcie->bridge_sw_init_set(pcie, 0);
1163 /* SERDES_IDDQ = 0 */
1164 tmp = readl(base + PCIE_MISC_HARD_PCIE_HARD_DEBUG);
1165 u32p_replace_bits(&tmp, 0, PCIE_MISC_HARD_PCIE_HARD_DEBUG_SERDES_IDDQ_MASK);
1166 writel(tmp, base + PCIE_MISC_HARD_PCIE_HARD_DEBUG);
1168 /* wait for serdes to be stable */
1171 ret = brcm_pcie_setup(pcie);
1176 brcm_msi_set_regs(pcie->msi);
1181 clk_disable_unprepare(pcie->clk);
1185 static void __brcm_pcie_remove(struct brcm_pcie *pcie)
1187 brcm_msi_remove(pcie);
1188 brcm_pcie_turn_off(pcie);
1189 brcm_phy_stop(pcie);
1190 reset_control_assert(pcie->rescal);
1191 clk_disable_unprepare(pcie->clk);
1194 static int brcm_pcie_remove(struct platform_device *pdev)
1196 struct brcm_pcie *pcie = platform_get_drvdata(pdev);
1197 struct pci_host_bridge *bridge = pci_host_bridge_from_priv(pcie);
1199 pci_stop_root_bus(bridge->bus);
1200 pci_remove_root_bus(bridge->bus);
1201 __brcm_pcie_remove(pcie);
1206 static const struct of_device_id brcm_pcie_match[] = {
1207 { .compatible = "brcm,bcm2711-pcie", .data = &bcm2711_cfg },
1208 { .compatible = "brcm,bcm7211-pcie", .data = &generic_cfg },
1209 { .compatible = "brcm,bcm7278-pcie", .data = &bcm7278_cfg },
1210 { .compatible = "brcm,bcm7216-pcie", .data = &bcm7278_cfg },
1211 { .compatible = "brcm,bcm7445-pcie", .data = &generic_cfg },
1215 static int brcm_pcie_probe(struct platform_device *pdev)
1217 struct device_node *np = pdev->dev.of_node, *msi_np;
1218 struct pci_host_bridge *bridge;
1219 const struct pcie_cfg_data *data;
1220 struct brcm_pcie *pcie;
1223 bridge = devm_pci_alloc_host_bridge(&pdev->dev, sizeof(*pcie));
1227 data = of_device_get_match_data(&pdev->dev);
1229 pr_err("failed to look up compatible string\n");
1233 pcie = pci_host_bridge_priv(bridge);
1234 pcie->dev = &pdev->dev;
1236 pcie->reg_offsets = data->offsets;
1237 pcie->type = data->type;
1238 pcie->perst_set = data->perst_set;
1239 pcie->bridge_sw_init_set = data->bridge_sw_init_set;
1241 pcie->base = devm_platform_ioremap_resource(pdev, 0);
1242 if (IS_ERR(pcie->base))
1243 return PTR_ERR(pcie->base);
1245 pcie->clk = devm_clk_get_optional(&pdev->dev, "sw_pcie");
1246 if (IS_ERR(pcie->clk))
1247 return PTR_ERR(pcie->clk);
1249 ret = of_pci_get_max_link_speed(np);
1250 pcie->gen = (ret < 0) ? 0 : ret;
1252 pcie->ssc = of_property_read_bool(np, "brcm,enable-ssc");
1254 ret = clk_prepare_enable(pcie->clk);
1256 dev_err(&pdev->dev, "could not enable clock\n");
1259 pcie->rescal = devm_reset_control_get_optional_shared(&pdev->dev, "rescal");
1260 if (IS_ERR(pcie->rescal)) {
1261 clk_disable_unprepare(pcie->clk);
1262 return PTR_ERR(pcie->rescal);
1265 ret = reset_control_deassert(pcie->rescal);
1267 dev_err(&pdev->dev, "failed to deassert 'rescal'\n");
1269 ret = brcm_phy_start(pcie);
1271 reset_control_assert(pcie->rescal);
1272 clk_disable_unprepare(pcie->clk);
1276 ret = brcm_pcie_setup(pcie);
1280 pcie->hw_rev = readl(pcie->base + PCIE_MISC_REVISION);
1282 msi_np = of_parse_phandle(pcie->np, "msi-parent", 0);
1283 if (pci_msi_enabled() && msi_np == pcie->np) {
1284 ret = brcm_pcie_enable_msi(pcie);
1286 dev_err(pcie->dev, "probe of internal MSI failed");
1291 bridge->ops = &brcm_pcie_ops;
1292 bridge->sysdata = pcie;
1294 platform_set_drvdata(pdev, pcie);
1296 return pci_host_probe(bridge);
1298 __brcm_pcie_remove(pcie);
1302 MODULE_DEVICE_TABLE(of, brcm_pcie_match);
1304 static const struct dev_pm_ops brcm_pcie_pm_ops = {
1305 .suspend = brcm_pcie_suspend,
1306 .resume = brcm_pcie_resume,
1309 static struct platform_driver brcm_pcie_driver = {
1310 .probe = brcm_pcie_probe,
1311 .remove = brcm_pcie_remove,
1313 .name = "brcm-pcie",
1314 .of_match_table = brcm_pcie_match,
1315 .pm = &brcm_pcie_pm_ops,
1318 module_platform_driver(brcm_pcie_driver);
1320 MODULE_LICENSE("GPL");
1321 MODULE_DESCRIPTION("Broadcom STB PCIe RC driver");
1322 MODULE_AUTHOR("Broadcom");