2 * PCIe host controller driver for Tegra SoCs
4 * Copyright (c) 2010, CompuLab, Ltd.
5 * Author: Mike Rapoport <mike@compulab.co.il>
7 * Based on NVIDIA PCIe driver
8 * Copyright (c) 2008-2009, NVIDIA Corporation.
10 * Bits taken from arch/arm/mach-dove/pcie.c
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or
15 * (at your option) any later version.
17 * This program is distributed in the hope that it will be useful, but WITHOUT
18 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
19 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
22 * You should have received a copy of the GNU General Public License along
23 * with this program; if not, write to the Free Software Foundation, Inc.,
24 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
27 #include <linux/clk.h>
28 #include <linux/delay.h>
29 #include <linux/export.h>
30 #include <linux/interrupt.h>
31 #include <linux/irq.h>
32 #include <linux/irqdomain.h>
33 #include <linux/kernel.h>
34 #include <linux/module.h>
35 #include <linux/msi.h>
36 #include <linux/of_address.h>
37 #include <linux/of_pci.h>
38 #include <linux/of_platform.h>
39 #include <linux/pci.h>
40 #include <linux/platform_device.h>
41 #include <linux/reset.h>
42 #include <linux/sizes.h>
43 #include <linux/slab.h>
44 #include <linux/tegra-cpuidle.h>
45 #include <linux/tegra-powergate.h>
46 #include <linux/vmalloc.h>
47 #include <linux/regulator/consumer.h>
49 #include <asm/mach/irq.h>
50 #include <asm/mach/map.h>
51 #include <asm/mach/pci.h>
53 #define INT_PCI_MSI_NR (8 * 32)
55 /* register definitions */
57 #define AFI_AXI_BAR0_SZ 0x00
58 #define AFI_AXI_BAR1_SZ 0x04
59 #define AFI_AXI_BAR2_SZ 0x08
60 #define AFI_AXI_BAR3_SZ 0x0c
61 #define AFI_AXI_BAR4_SZ 0x10
62 #define AFI_AXI_BAR5_SZ 0x14
64 #define AFI_AXI_BAR0_START 0x18
65 #define AFI_AXI_BAR1_START 0x1c
66 #define AFI_AXI_BAR2_START 0x20
67 #define AFI_AXI_BAR3_START 0x24
68 #define AFI_AXI_BAR4_START 0x28
69 #define AFI_AXI_BAR5_START 0x2c
71 #define AFI_FPCI_BAR0 0x30
72 #define AFI_FPCI_BAR1 0x34
73 #define AFI_FPCI_BAR2 0x38
74 #define AFI_FPCI_BAR3 0x3c
75 #define AFI_FPCI_BAR4 0x40
76 #define AFI_FPCI_BAR5 0x44
78 #define AFI_CACHE_BAR0_SZ 0x48
79 #define AFI_CACHE_BAR0_ST 0x4c
80 #define AFI_CACHE_BAR1_SZ 0x50
81 #define AFI_CACHE_BAR1_ST 0x54
83 #define AFI_MSI_BAR_SZ 0x60
84 #define AFI_MSI_FPCI_BAR_ST 0x64
85 #define AFI_MSI_AXI_BAR_ST 0x68
87 #define AFI_MSI_VEC0 0x6c
88 #define AFI_MSI_VEC1 0x70
89 #define AFI_MSI_VEC2 0x74
90 #define AFI_MSI_VEC3 0x78
91 #define AFI_MSI_VEC4 0x7c
92 #define AFI_MSI_VEC5 0x80
93 #define AFI_MSI_VEC6 0x84
94 #define AFI_MSI_VEC7 0x88
96 #define AFI_MSI_EN_VEC0 0x8c
97 #define AFI_MSI_EN_VEC1 0x90
98 #define AFI_MSI_EN_VEC2 0x94
99 #define AFI_MSI_EN_VEC3 0x98
100 #define AFI_MSI_EN_VEC4 0x9c
101 #define AFI_MSI_EN_VEC5 0xa0
102 #define AFI_MSI_EN_VEC6 0xa4
103 #define AFI_MSI_EN_VEC7 0xa8
105 #define AFI_CONFIGURATION 0xac
106 #define AFI_CONFIGURATION_EN_FPCI (1 << 0)
108 #define AFI_FPCI_ERROR_MASKS 0xb0
110 #define AFI_INTR_MASK 0xb4
111 #define AFI_INTR_MASK_INT_MASK (1 << 0)
112 #define AFI_INTR_MASK_MSI_MASK (1 << 8)
114 #define AFI_INTR_CODE 0xb8
115 #define AFI_INTR_CODE_MASK 0xf
116 #define AFI_INTR_AXI_SLAVE_ERROR 1
117 #define AFI_INTR_AXI_DECODE_ERROR 2
118 #define AFI_INTR_TARGET_ABORT 3
119 #define AFI_INTR_MASTER_ABORT 4
120 #define AFI_INTR_INVALID_WRITE 5
121 #define AFI_INTR_LEGACY 6
122 #define AFI_INTR_FPCI_DECODE_ERROR 7
124 #define AFI_INTR_SIGNATURE 0xbc
125 #define AFI_UPPER_FPCI_ADDRESS 0xc0
126 #define AFI_SM_INTR_ENABLE 0xc4
127 #define AFI_SM_INTR_INTA_ASSERT (1 << 0)
128 #define AFI_SM_INTR_INTB_ASSERT (1 << 1)
129 #define AFI_SM_INTR_INTC_ASSERT (1 << 2)
130 #define AFI_SM_INTR_INTD_ASSERT (1 << 3)
131 #define AFI_SM_INTR_INTA_DEASSERT (1 << 4)
132 #define AFI_SM_INTR_INTB_DEASSERT (1 << 5)
133 #define AFI_SM_INTR_INTC_DEASSERT (1 << 6)
134 #define AFI_SM_INTR_INTD_DEASSERT (1 << 7)
136 #define AFI_AFI_INTR_ENABLE 0xc8
137 #define AFI_INTR_EN_INI_SLVERR (1 << 0)
138 #define AFI_INTR_EN_INI_DECERR (1 << 1)
139 #define AFI_INTR_EN_TGT_SLVERR (1 << 2)
140 #define AFI_INTR_EN_TGT_DECERR (1 << 3)
141 #define AFI_INTR_EN_TGT_WRERR (1 << 4)
142 #define AFI_INTR_EN_DFPCI_DECERR (1 << 5)
143 #define AFI_INTR_EN_AXI_DECERR (1 << 6)
144 #define AFI_INTR_EN_FPCI_TIMEOUT (1 << 7)
145 #define AFI_INTR_EN_PRSNT_SENSE (1 << 8)
147 #define AFI_PCIE_CONFIG 0x0f8
148 #define AFI_PCIE_CONFIG_PCIE_DISABLE(x) (1 << ((x) + 1))
149 #define AFI_PCIE_CONFIG_PCIE_DISABLE_ALL 0xe
150 #define AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_MASK (0xf << 20)
151 #define AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_SINGLE (0x0 << 20)
152 #define AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_420 (0x0 << 20)
153 #define AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_DUAL (0x1 << 20)
154 #define AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_222 (0x1 << 20)
155 #define AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_411 (0x2 << 20)
157 #define AFI_FUSE 0x104
158 #define AFI_FUSE_PCIE_T0_GEN2_DIS (1 << 2)
160 #define AFI_PEX0_CTRL 0x110
161 #define AFI_PEX1_CTRL 0x118
162 #define AFI_PEX2_CTRL 0x128
163 #define AFI_PEX_CTRL_RST (1 << 0)
164 #define AFI_PEX_CTRL_CLKREQ_EN (1 << 1)
165 #define AFI_PEX_CTRL_REFCLK_EN (1 << 3)
167 #define AFI_PEXBIAS_CTRL_0 0x168
169 #define RP_VEND_XP 0x00000F00
170 #define RP_VEND_XP_DL_UP (1 << 30)
172 #define RP_LINK_CONTROL_STATUS 0x00000090
173 #define RP_LINK_CONTROL_STATUS_DL_LINK_ACTIVE 0x20000000
174 #define RP_LINK_CONTROL_STATUS_LINKSTAT_MASK 0x3fff0000
176 #define PADS_CTL_SEL 0x0000009C
178 #define PADS_CTL 0x000000A0
179 #define PADS_CTL_IDDQ_1L (1 << 0)
180 #define PADS_CTL_TX_DATA_EN_1L (1 << 6)
181 #define PADS_CTL_RX_DATA_EN_1L (1 << 10)
183 #define PADS_PLL_CTL_TEGRA20 0x000000B8
184 #define PADS_PLL_CTL_TEGRA30 0x000000B4
185 #define PADS_PLL_CTL_RST_B4SM (1 << 1)
186 #define PADS_PLL_CTL_LOCKDET (1 << 8)
187 #define PADS_PLL_CTL_REFCLK_MASK (0x3 << 16)
188 #define PADS_PLL_CTL_REFCLK_INTERNAL_CML (0 << 16)
189 #define PADS_PLL_CTL_REFCLK_INTERNAL_CMOS (1 << 16)
190 #define PADS_PLL_CTL_REFCLK_EXTERNAL (2 << 16)
191 #define PADS_PLL_CTL_TXCLKREF_MASK (0x1 << 20)
192 #define PADS_PLL_CTL_TXCLKREF_DIV10 (0 << 20)
193 #define PADS_PLL_CTL_TXCLKREF_DIV5 (1 << 20)
194 #define PADS_PLL_CTL_TXCLKREF_BUF_EN (1 << 22)
196 #define PADS_REFCLK_CFG0 0x000000C8
197 #define PADS_REFCLK_CFG1 0x000000CC
200 * Fields in PADS_REFCLK_CFG*. Those registers form an array of 16-bit
201 * entries, one entry per PCIe port. These field definitions and desired
202 * values aren't in the TRM, but do come from NVIDIA.
204 #define PADS_REFCLK_CFG_TERM_SHIFT 2 /* 6:2 */
205 #define PADS_REFCLK_CFG_E_TERM_SHIFT 7
206 #define PADS_REFCLK_CFG_PREDI_SHIFT 8 /* 11:8 */
207 #define PADS_REFCLK_CFG_DRVI_SHIFT 12 /* 15:12 */
209 /* Default value provided by HW engineering is 0xfa5c */
210 #define PADS_REFCLK_CFG_VALUE \
212 (0x17 << PADS_REFCLK_CFG_TERM_SHIFT) | \
213 (0 << PADS_REFCLK_CFG_E_TERM_SHIFT) | \
214 (0xa << PADS_REFCLK_CFG_PREDI_SHIFT) | \
215 (0xf << PADS_REFCLK_CFG_DRVI_SHIFT) \
219 struct msi_chip chip;
220 DECLARE_BITMAP(used, INT_PCI_MSI_NR);
221 struct irq_domain *domain;
227 /* used to differentiate between Tegra SoC generations */
228 struct tegra_pcie_soc_data {
229 unsigned int num_ports;
230 unsigned int msi_base_shift;
233 bool has_pex_clkreq_en;
234 bool has_pex_bias_ctrl;
235 bool has_intr_prsnt_sense;
239 static inline struct tegra_msi *to_tegra_msi(struct msi_chip *chip)
241 return container_of(chip, struct tegra_msi, chip);
251 struct list_head buses;
256 struct resource prefetch;
257 struct resource busn;
264 struct reset_control *pex_rst;
265 struct reset_control *afi_rst;
266 struct reset_control *pcie_xrst;
268 struct tegra_msi msi;
270 struct list_head ports;
271 unsigned int num_ports;
274 struct regulator_bulk_data *supplies;
275 unsigned int num_supplies;
277 const struct tegra_pcie_soc_data *soc_data;
280 struct tegra_pcie_port {
281 struct tegra_pcie *pcie;
282 struct list_head list;
283 struct resource regs;
289 struct tegra_pcie_bus {
290 struct vm_struct *area;
291 struct list_head list;
295 static inline struct tegra_pcie *sys_to_pcie(struct pci_sys_data *sys)
297 return sys->private_data;
300 static inline void afi_writel(struct tegra_pcie *pcie, u32 value,
301 unsigned long offset)
303 writel(value, pcie->afi + offset);
306 static inline u32 afi_readl(struct tegra_pcie *pcie, unsigned long offset)
308 return readl(pcie->afi + offset);
311 static inline void pads_writel(struct tegra_pcie *pcie, u32 value,
312 unsigned long offset)
314 writel(value, pcie->pads + offset);
317 static inline u32 pads_readl(struct tegra_pcie *pcie, unsigned long offset)
319 return readl(pcie->pads + offset);
323 * The configuration space mapping on Tegra is somewhat similar to the ECAM
324 * defined by PCIe. However it deviates a bit in how the 4 bits for extended
325 * register accesses are mapped:
327 * [27:24] extended register number
329 * [15:11] device number
330 * [10: 8] function number
331 * [ 7: 0] register number
333 * Mapping the whole extended configuration space would require 256 MiB of
334 * virtual address space, only a small part of which will actually be used.
335 * To work around this, a 1 MiB of virtual addresses are allocated per bus
336 * when the bus is first accessed. When the physical range is mapped, the
337 * the bus number bits are hidden so that the extended register number bits
338 * appear as bits [19:16]. Therefore the virtual mapping looks like this:
340 * [19:16] extended register number
341 * [15:11] device number
342 * [10: 8] function number
343 * [ 7: 0] register number
345 * This is achieved by stitching together 16 chunks of 64 KiB of physical
346 * address space via the MMU.
348 static unsigned long tegra_pcie_conf_offset(unsigned int devfn, int where)
350 return ((where & 0xf00) << 8) | (PCI_SLOT(devfn) << 11) |
351 (PCI_FUNC(devfn) << 8) | (where & 0xfc);
354 static struct tegra_pcie_bus *tegra_pcie_bus_alloc(struct tegra_pcie *pcie,
357 pgprot_t prot = L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_DIRTY | L_PTE_XN |
358 L_PTE_MT_DEV_SHARED | L_PTE_SHARED;
359 phys_addr_t cs = pcie->cs->start;
360 struct tegra_pcie_bus *bus;
364 bus = kzalloc(sizeof(*bus), GFP_KERNEL);
366 return ERR_PTR(-ENOMEM);
368 INIT_LIST_HEAD(&bus->list);
371 /* allocate 1 MiB of virtual addresses */
372 bus->area = get_vm_area(SZ_1M, VM_IOREMAP);
378 /* map each of the 16 chunks of 64 KiB each */
379 for (i = 0; i < 16; i++) {
380 unsigned long virt = (unsigned long)bus->area->addr +
382 phys_addr_t phys = cs + i * SZ_1M + busnr * SZ_64K;
384 err = ioremap_page_range(virt, virt + SZ_64K, phys, prot);
386 dev_err(pcie->dev, "ioremap_page_range() failed: %d\n",
395 vunmap(bus->area->addr);
402 * Look up a virtual address mapping for the specified bus number. If no such
403 * mapping exists, try to create one.
405 static void __iomem *tegra_pcie_bus_map(struct tegra_pcie *pcie,
408 struct tegra_pcie_bus *bus;
410 list_for_each_entry(bus, &pcie->buses, list)
411 if (bus->nr == busnr)
412 return (void __iomem *)bus->area->addr;
414 bus = tegra_pcie_bus_alloc(pcie, busnr);
418 list_add_tail(&bus->list, &pcie->buses);
420 return (void __iomem *)bus->area->addr;
423 static void __iomem *tegra_pcie_conf_address(struct pci_bus *bus,
427 struct tegra_pcie *pcie = sys_to_pcie(bus->sysdata);
428 void __iomem *addr = NULL;
430 if (bus->number == 0) {
431 unsigned int slot = PCI_SLOT(devfn);
432 struct tegra_pcie_port *port;
434 list_for_each_entry(port, &pcie->ports, list) {
435 if (port->index + 1 == slot) {
436 addr = port->base + (where & ~3);
441 addr = tegra_pcie_bus_map(pcie, bus->number);
444 "failed to map cfg. space for bus %u\n",
449 addr += tegra_pcie_conf_offset(devfn, where);
455 static int tegra_pcie_read_conf(struct pci_bus *bus, unsigned int devfn,
456 int where, int size, u32 *value)
460 addr = tegra_pcie_conf_address(bus, devfn, where);
463 return PCIBIOS_DEVICE_NOT_FOUND;
466 *value = readl(addr);
469 *value = (*value >> (8 * (where & 3))) & 0xff;
471 *value = (*value >> (8 * (where & 3))) & 0xffff;
473 return PCIBIOS_SUCCESSFUL;
476 static int tegra_pcie_write_conf(struct pci_bus *bus, unsigned int devfn,
477 int where, int size, u32 value)
482 addr = tegra_pcie_conf_address(bus, devfn, where);
484 return PCIBIOS_DEVICE_NOT_FOUND;
488 return PCIBIOS_SUCCESSFUL;
492 mask = ~(0xffff << ((where & 0x3) * 8));
494 mask = ~(0xff << ((where & 0x3) * 8));
496 return PCIBIOS_BAD_REGISTER_NUMBER;
498 tmp = readl(addr) & mask;
499 tmp |= value << ((where & 0x3) * 8);
502 return PCIBIOS_SUCCESSFUL;
505 static struct pci_ops tegra_pcie_ops = {
506 .read = tegra_pcie_read_conf,
507 .write = tegra_pcie_write_conf,
510 static unsigned long tegra_pcie_port_get_pex_ctrl(struct tegra_pcie_port *port)
512 unsigned long ret = 0;
514 switch (port->index) {
531 static void tegra_pcie_port_reset(struct tegra_pcie_port *port)
533 unsigned long ctrl = tegra_pcie_port_get_pex_ctrl(port);
536 /* pulse reset signal */
537 value = afi_readl(port->pcie, ctrl);
538 value &= ~AFI_PEX_CTRL_RST;
539 afi_writel(port->pcie, value, ctrl);
541 usleep_range(1000, 2000);
543 value = afi_readl(port->pcie, ctrl);
544 value |= AFI_PEX_CTRL_RST;
545 afi_writel(port->pcie, value, ctrl);
548 static void tegra_pcie_port_enable(struct tegra_pcie_port *port)
550 const struct tegra_pcie_soc_data *soc = port->pcie->soc_data;
551 unsigned long ctrl = tegra_pcie_port_get_pex_ctrl(port);
554 /* enable reference clock */
555 value = afi_readl(port->pcie, ctrl);
556 value |= AFI_PEX_CTRL_REFCLK_EN;
558 if (soc->has_pex_clkreq_en)
559 value |= AFI_PEX_CTRL_CLKREQ_EN;
561 afi_writel(port->pcie, value, ctrl);
563 tegra_pcie_port_reset(port);
566 static void tegra_pcie_port_disable(struct tegra_pcie_port *port)
568 unsigned long ctrl = tegra_pcie_port_get_pex_ctrl(port);
571 /* assert port reset */
572 value = afi_readl(port->pcie, ctrl);
573 value &= ~AFI_PEX_CTRL_RST;
574 afi_writel(port->pcie, value, ctrl);
576 /* disable reference clock */
577 value = afi_readl(port->pcie, ctrl);
578 value &= ~AFI_PEX_CTRL_REFCLK_EN;
579 afi_writel(port->pcie, value, ctrl);
582 static void tegra_pcie_port_free(struct tegra_pcie_port *port)
584 struct tegra_pcie *pcie = port->pcie;
586 devm_iounmap(pcie->dev, port->base);
587 devm_release_mem_region(pcie->dev, port->regs.start,
588 resource_size(&port->regs));
589 list_del(&port->list);
590 devm_kfree(pcie->dev, port);
593 static void tegra_pcie_fixup_bridge(struct pci_dev *dev)
597 if ((dev->class >> 16) == PCI_BASE_CLASS_BRIDGE) {
598 pci_read_config_word(dev, PCI_COMMAND, ®);
599 reg |= (PCI_COMMAND_IO | PCI_COMMAND_MEMORY |
600 PCI_COMMAND_MASTER | PCI_COMMAND_SERR);
601 pci_write_config_word(dev, PCI_COMMAND, reg);
604 DECLARE_PCI_FIXUP_FINAL(PCI_ANY_ID, PCI_ANY_ID, tegra_pcie_fixup_bridge);
606 /* Tegra PCIE root complex wrongly reports device class */
607 static void tegra_pcie_fixup_class(struct pci_dev *dev)
609 dev->class = PCI_CLASS_BRIDGE_PCI << 8;
611 DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_NVIDIA, 0x0bf0, tegra_pcie_fixup_class);
612 DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_NVIDIA, 0x0bf1, tegra_pcie_fixup_class);
613 DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_NVIDIA, 0x0e1c, tegra_pcie_fixup_class);
614 DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_NVIDIA, 0x0e1d, tegra_pcie_fixup_class);
616 /* Tegra PCIE requires relaxed ordering */
617 static void tegra_pcie_relax_enable(struct pci_dev *dev)
619 pcie_capability_set_word(dev, PCI_EXP_DEVCTL, PCI_EXP_DEVCTL_RELAX_EN);
621 DECLARE_PCI_FIXUP_FINAL(PCI_ANY_ID, PCI_ANY_ID, tegra_pcie_relax_enable);
623 static int tegra_pcie_setup(int nr, struct pci_sys_data *sys)
625 struct tegra_pcie *pcie = sys_to_pcie(sys);
627 pci_add_resource_offset(&sys->resources, &pcie->mem, sys->mem_offset);
628 pci_add_resource_offset(&sys->resources, &pcie->prefetch,
630 pci_add_resource(&sys->resources, &pcie->busn);
632 pci_ioremap_io(nr * SZ_64K, pcie->io.start);
637 static int tegra_pcie_map_irq(const struct pci_dev *pdev, u8 slot, u8 pin)
639 struct tegra_pcie *pcie = sys_to_pcie(pdev->bus->sysdata);
642 tegra_cpuidle_pcie_irqs_in_use();
644 irq = of_irq_parse_and_map_pci(pdev, slot, pin);
651 static void tegra_pcie_add_bus(struct pci_bus *bus)
653 if (IS_ENABLED(CONFIG_PCI_MSI)) {
654 struct tegra_pcie *pcie = sys_to_pcie(bus->sysdata);
656 bus->msi = &pcie->msi.chip;
660 static struct pci_bus *tegra_pcie_scan_bus(int nr, struct pci_sys_data *sys)
662 struct tegra_pcie *pcie = sys_to_pcie(sys);
665 bus = pci_create_root_bus(pcie->dev, sys->busnr, &tegra_pcie_ops, sys,
670 pci_scan_child_bus(bus);
675 static irqreturn_t tegra_pcie_isr(int irq, void *arg)
677 const char *err_msg[] = {
684 "Response decoding error",
685 "AXI response decoding error",
686 "Transaction timeout",
688 struct tegra_pcie *pcie = arg;
691 code = afi_readl(pcie, AFI_INTR_CODE) & AFI_INTR_CODE_MASK;
692 signature = afi_readl(pcie, AFI_INTR_SIGNATURE);
693 afi_writel(pcie, 0, AFI_INTR_CODE);
695 if (code == AFI_INTR_LEGACY)
698 if (code >= ARRAY_SIZE(err_msg))
702 * do not pollute kernel log with master abort reports since they
703 * happen a lot during enumeration
705 if (code == AFI_INTR_MASTER_ABORT)
706 dev_dbg(pcie->dev, "%s, signature: %08x\n", err_msg[code],
709 dev_err(pcie->dev, "%s, signature: %08x\n", err_msg[code],
712 if (code == AFI_INTR_TARGET_ABORT || code == AFI_INTR_MASTER_ABORT ||
713 code == AFI_INTR_FPCI_DECODE_ERROR) {
714 u32 fpci = afi_readl(pcie, AFI_UPPER_FPCI_ADDRESS) & 0xff;
715 u64 address = (u64)fpci << 32 | (signature & 0xfffffffc);
717 if (code == AFI_INTR_MASTER_ABORT)
718 dev_dbg(pcie->dev, " FPCI address: %10llx\n", address);
720 dev_err(pcie->dev, " FPCI address: %10llx\n", address);
727 * FPCI map is as follows:
728 * - 0xfdfc000000: I/O space
729 * - 0xfdfe000000: type 0 configuration space
730 * - 0xfdff000000: type 1 configuration space
731 * - 0xfe00000000: type 0 extended configuration space
732 * - 0xfe10000000: type 1 extended configuration space
734 static void tegra_pcie_setup_translations(struct tegra_pcie *pcie)
736 u32 fpci_bar, size, axi_address;
738 /* Bar 0: type 1 extended configuration space */
739 fpci_bar = 0xfe100000;
740 size = resource_size(pcie->cs);
741 axi_address = pcie->cs->start;
742 afi_writel(pcie, axi_address, AFI_AXI_BAR0_START);
743 afi_writel(pcie, size >> 12, AFI_AXI_BAR0_SZ);
744 afi_writel(pcie, fpci_bar, AFI_FPCI_BAR0);
746 /* Bar 1: downstream IO bar */
747 fpci_bar = 0xfdfc0000;
748 size = resource_size(&pcie->io);
749 axi_address = pcie->io.start;
750 afi_writel(pcie, axi_address, AFI_AXI_BAR1_START);
751 afi_writel(pcie, size >> 12, AFI_AXI_BAR1_SZ);
752 afi_writel(pcie, fpci_bar, AFI_FPCI_BAR1);
754 /* Bar 2: prefetchable memory BAR */
755 fpci_bar = (((pcie->prefetch.start >> 12) & 0x0fffffff) << 4) | 0x1;
756 size = resource_size(&pcie->prefetch);
757 axi_address = pcie->prefetch.start;
758 afi_writel(pcie, axi_address, AFI_AXI_BAR2_START);
759 afi_writel(pcie, size >> 12, AFI_AXI_BAR2_SZ);
760 afi_writel(pcie, fpci_bar, AFI_FPCI_BAR2);
762 /* Bar 3: non prefetchable memory BAR */
763 fpci_bar = (((pcie->mem.start >> 12) & 0x0fffffff) << 4) | 0x1;
764 size = resource_size(&pcie->mem);
765 axi_address = pcie->mem.start;
766 afi_writel(pcie, axi_address, AFI_AXI_BAR3_START);
767 afi_writel(pcie, size >> 12, AFI_AXI_BAR3_SZ);
768 afi_writel(pcie, fpci_bar, AFI_FPCI_BAR3);
770 /* NULL out the remaining BARs as they are not used */
771 afi_writel(pcie, 0, AFI_AXI_BAR4_START);
772 afi_writel(pcie, 0, AFI_AXI_BAR4_SZ);
773 afi_writel(pcie, 0, AFI_FPCI_BAR4);
775 afi_writel(pcie, 0, AFI_AXI_BAR5_START);
776 afi_writel(pcie, 0, AFI_AXI_BAR5_SZ);
777 afi_writel(pcie, 0, AFI_FPCI_BAR5);
779 /* map all upstream transactions as uncached */
780 afi_writel(pcie, PHYS_OFFSET, AFI_CACHE_BAR0_ST);
781 afi_writel(pcie, 0, AFI_CACHE_BAR0_SZ);
782 afi_writel(pcie, 0, AFI_CACHE_BAR1_ST);
783 afi_writel(pcie, 0, AFI_CACHE_BAR1_SZ);
785 /* MSI translations are setup only when needed */
786 afi_writel(pcie, 0, AFI_MSI_FPCI_BAR_ST);
787 afi_writel(pcie, 0, AFI_MSI_BAR_SZ);
788 afi_writel(pcie, 0, AFI_MSI_AXI_BAR_ST);
789 afi_writel(pcie, 0, AFI_MSI_BAR_SZ);
792 static int tegra_pcie_enable_controller(struct tegra_pcie *pcie)
794 const struct tegra_pcie_soc_data *soc = pcie->soc_data;
795 struct tegra_pcie_port *port;
796 unsigned int timeout;
799 /* power down PCIe slot clock bias pad */
800 if (soc->has_pex_bias_ctrl)
801 afi_writel(pcie, 0, AFI_PEXBIAS_CTRL_0);
803 /* configure mode and disable all ports */
804 value = afi_readl(pcie, AFI_PCIE_CONFIG);
805 value &= ~AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_MASK;
806 value |= AFI_PCIE_CONFIG_PCIE_DISABLE_ALL | pcie->xbar_config;
808 list_for_each_entry(port, &pcie->ports, list)
809 value &= ~AFI_PCIE_CONFIG_PCIE_DISABLE(port->index);
811 afi_writel(pcie, value, AFI_PCIE_CONFIG);
813 value = afi_readl(pcie, AFI_FUSE);
814 value |= AFI_FUSE_PCIE_T0_GEN2_DIS;
815 afi_writel(pcie, value, AFI_FUSE);
817 /* initialize internal PHY, enable up to 16 PCIE lanes */
818 pads_writel(pcie, 0x0, PADS_CTL_SEL);
820 /* override IDDQ to 1 on all 4 lanes */
821 value = pads_readl(pcie, PADS_CTL);
822 value |= PADS_CTL_IDDQ_1L;
823 pads_writel(pcie, value, PADS_CTL);
826 * Set up PHY PLL inputs select PLLE output as refclock,
827 * set TX ref sel to div10 (not div5).
829 value = pads_readl(pcie, soc->pads_pll_ctl);
830 value &= ~(PADS_PLL_CTL_REFCLK_MASK | PADS_PLL_CTL_TXCLKREF_MASK);
831 value |= PADS_PLL_CTL_REFCLK_INTERNAL_CML | soc->tx_ref_sel;
832 pads_writel(pcie, value, soc->pads_pll_ctl);
834 /* take PLL out of reset */
835 value = pads_readl(pcie, soc->pads_pll_ctl);
836 value |= PADS_PLL_CTL_RST_B4SM;
837 pads_writel(pcie, value, soc->pads_pll_ctl);
839 /* Configure the reference clock driver */
840 value = PADS_REFCLK_CFG_VALUE | (PADS_REFCLK_CFG_VALUE << 16);
841 pads_writel(pcie, value, PADS_REFCLK_CFG0);
842 if (soc->num_ports > 2)
843 pads_writel(pcie, PADS_REFCLK_CFG_VALUE, PADS_REFCLK_CFG1);
845 /* wait for the PLL to lock */
848 value = pads_readl(pcie, soc->pads_pll_ctl);
849 usleep_range(1000, 2000);
850 if (--timeout == 0) {
851 pr_err("Tegra PCIe error: timeout waiting for PLL\n");
854 } while (!(value & PADS_PLL_CTL_LOCKDET));
856 /* turn off IDDQ override */
857 value = pads_readl(pcie, PADS_CTL);
858 value &= ~PADS_CTL_IDDQ_1L;
859 pads_writel(pcie, value, PADS_CTL);
861 /* enable TX/RX data */
862 value = pads_readl(pcie, PADS_CTL);
863 value |= PADS_CTL_TX_DATA_EN_1L | PADS_CTL_RX_DATA_EN_1L;
864 pads_writel(pcie, value, PADS_CTL);
866 /* take the PCIe interface module out of reset */
867 reset_control_deassert(pcie->pcie_xrst);
869 /* finally enable PCIe */
870 value = afi_readl(pcie, AFI_CONFIGURATION);
871 value |= AFI_CONFIGURATION_EN_FPCI;
872 afi_writel(pcie, value, AFI_CONFIGURATION);
874 value = AFI_INTR_EN_INI_SLVERR | AFI_INTR_EN_INI_DECERR |
875 AFI_INTR_EN_TGT_SLVERR | AFI_INTR_EN_TGT_DECERR |
876 AFI_INTR_EN_TGT_WRERR | AFI_INTR_EN_DFPCI_DECERR;
878 if (soc->has_intr_prsnt_sense)
879 value |= AFI_INTR_EN_PRSNT_SENSE;
881 afi_writel(pcie, value, AFI_AFI_INTR_ENABLE);
882 afi_writel(pcie, 0xffffffff, AFI_SM_INTR_ENABLE);
884 /* don't enable MSI for now, only when needed */
885 afi_writel(pcie, AFI_INTR_MASK_INT_MASK, AFI_INTR_MASK);
887 /* disable all exceptions */
888 afi_writel(pcie, 0, AFI_FPCI_ERROR_MASKS);
893 static void tegra_pcie_power_off(struct tegra_pcie *pcie)
897 /* TODO: disable and unprepare clocks? */
899 reset_control_assert(pcie->pcie_xrst);
900 reset_control_assert(pcie->afi_rst);
901 reset_control_assert(pcie->pex_rst);
903 tegra_powergate_power_off(TEGRA_POWERGATE_PCIE);
905 err = regulator_bulk_disable(pcie->num_supplies, pcie->supplies);
907 dev_warn(pcie->dev, "failed to disable regulators: %d\n", err);
910 static int tegra_pcie_power_on(struct tegra_pcie *pcie)
912 const struct tegra_pcie_soc_data *soc = pcie->soc_data;
915 reset_control_assert(pcie->pcie_xrst);
916 reset_control_assert(pcie->afi_rst);
917 reset_control_assert(pcie->pex_rst);
919 tegra_powergate_power_off(TEGRA_POWERGATE_PCIE);
921 /* enable regulators */
922 err = regulator_bulk_enable(pcie->num_supplies, pcie->supplies);
924 dev_err(pcie->dev, "failed to enable regulators: %d\n", err);
926 err = tegra_powergate_sequence_power_up(TEGRA_POWERGATE_PCIE,
930 dev_err(pcie->dev, "powerup sequence failed: %d\n", err);
934 reset_control_deassert(pcie->afi_rst);
936 err = clk_prepare_enable(pcie->afi_clk);
938 dev_err(pcie->dev, "failed to enable AFI clock: %d\n", err);
942 if (soc->has_cml_clk) {
943 err = clk_prepare_enable(pcie->cml_clk);
945 dev_err(pcie->dev, "failed to enable CML clock: %d\n",
951 err = clk_prepare_enable(pcie->pll_e);
953 dev_err(pcie->dev, "failed to enable PLLE clock: %d\n", err);
960 static int tegra_pcie_clocks_get(struct tegra_pcie *pcie)
962 const struct tegra_pcie_soc_data *soc = pcie->soc_data;
964 pcie->pex_clk = devm_clk_get(pcie->dev, "pex");
965 if (IS_ERR(pcie->pex_clk))
966 return PTR_ERR(pcie->pex_clk);
968 pcie->afi_clk = devm_clk_get(pcie->dev, "afi");
969 if (IS_ERR(pcie->afi_clk))
970 return PTR_ERR(pcie->afi_clk);
972 pcie->pll_e = devm_clk_get(pcie->dev, "pll_e");
973 if (IS_ERR(pcie->pll_e))
974 return PTR_ERR(pcie->pll_e);
976 if (soc->has_cml_clk) {
977 pcie->cml_clk = devm_clk_get(pcie->dev, "cml");
978 if (IS_ERR(pcie->cml_clk))
979 return PTR_ERR(pcie->cml_clk);
985 static int tegra_pcie_resets_get(struct tegra_pcie *pcie)
987 pcie->pex_rst = devm_reset_control_get(pcie->dev, "pex");
988 if (IS_ERR(pcie->pex_rst))
989 return PTR_ERR(pcie->pex_rst);
991 pcie->afi_rst = devm_reset_control_get(pcie->dev, "afi");
992 if (IS_ERR(pcie->afi_rst))
993 return PTR_ERR(pcie->afi_rst);
995 pcie->pcie_xrst = devm_reset_control_get(pcie->dev, "pcie_x");
996 if (IS_ERR(pcie->pcie_xrst))
997 return PTR_ERR(pcie->pcie_xrst);
1002 static int tegra_pcie_get_resources(struct tegra_pcie *pcie)
1004 struct platform_device *pdev = to_platform_device(pcie->dev);
1005 struct resource *pads, *afi, *res;
1008 err = tegra_pcie_clocks_get(pcie);
1010 dev_err(&pdev->dev, "failed to get clocks: %d\n", err);
1014 err = tegra_pcie_resets_get(pcie);
1016 dev_err(&pdev->dev, "failed to get resets: %d\n", err);
1020 err = tegra_pcie_power_on(pcie);
1022 dev_err(&pdev->dev, "failed to power up: %d\n", err);
1026 pads = platform_get_resource_byname(pdev, IORESOURCE_MEM, "pads");
1027 pcie->pads = devm_ioremap_resource(&pdev->dev, pads);
1028 if (IS_ERR(pcie->pads)) {
1029 err = PTR_ERR(pcie->pads);
1033 afi = platform_get_resource_byname(pdev, IORESOURCE_MEM, "afi");
1034 pcie->afi = devm_ioremap_resource(&pdev->dev, afi);
1035 if (IS_ERR(pcie->afi)) {
1036 err = PTR_ERR(pcie->afi);
1040 /* request configuration space, but remap later, on demand */
1041 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "cs");
1043 err = -EADDRNOTAVAIL;
1047 pcie->cs = devm_request_mem_region(pcie->dev, res->start,
1048 resource_size(res), res->name);
1050 err = -EADDRNOTAVAIL;
1054 /* request interrupt */
1055 err = platform_get_irq_byname(pdev, "intr");
1057 dev_err(&pdev->dev, "failed to get IRQ: %d\n", err);
1063 err = request_irq(pcie->irq, tegra_pcie_isr, IRQF_SHARED, "PCIE", pcie);
1065 dev_err(&pdev->dev, "failed to register IRQ: %d\n", err);
1072 tegra_pcie_power_off(pcie);
1076 static int tegra_pcie_put_resources(struct tegra_pcie *pcie)
1079 free_irq(pcie->irq, pcie);
1081 tegra_pcie_power_off(pcie);
1085 static int tegra_msi_alloc(struct tegra_msi *chip)
1089 mutex_lock(&chip->lock);
1091 msi = find_first_zero_bit(chip->used, INT_PCI_MSI_NR);
1092 if (msi < INT_PCI_MSI_NR)
1093 set_bit(msi, chip->used);
1097 mutex_unlock(&chip->lock);
1102 static void tegra_msi_free(struct tegra_msi *chip, unsigned long irq)
1104 struct device *dev = chip->chip.dev;
1106 mutex_lock(&chip->lock);
1108 if (!test_bit(irq, chip->used))
1109 dev_err(dev, "trying to free unused MSI#%lu\n", irq);
1111 clear_bit(irq, chip->used);
1113 mutex_unlock(&chip->lock);
1116 static irqreturn_t tegra_pcie_msi_irq(int irq, void *data)
1118 struct tegra_pcie *pcie = data;
1119 struct tegra_msi *msi = &pcie->msi;
1120 unsigned int i, processed = 0;
1122 for (i = 0; i < 8; i++) {
1123 unsigned long reg = afi_readl(pcie, AFI_MSI_VEC0 + i * 4);
1126 unsigned int offset = find_first_bit(®, 32);
1127 unsigned int index = i * 32 + offset;
1130 /* clear the interrupt */
1131 afi_writel(pcie, 1 << offset, AFI_MSI_VEC0 + i * 4);
1133 irq = irq_find_mapping(msi->domain, index);
1135 if (test_bit(index, msi->used))
1136 generic_handle_irq(irq);
1138 dev_info(pcie->dev, "unhandled MSI\n");
1141 * that's weird who triggered this?
1144 dev_info(pcie->dev, "unexpected MSI\n");
1147 /* see if there's any more pending in this vector */
1148 reg = afi_readl(pcie, AFI_MSI_VEC0 + i * 4);
1154 return processed > 0 ? IRQ_HANDLED : IRQ_NONE;
1157 static int tegra_msi_setup_irq(struct msi_chip *chip, struct pci_dev *pdev,
1158 struct msi_desc *desc)
1160 struct tegra_msi *msi = to_tegra_msi(chip);
1165 hwirq = tegra_msi_alloc(msi);
1169 irq = irq_create_mapping(msi->domain, hwirq);
1173 irq_set_msi_desc(irq, desc);
1175 msg.address_lo = virt_to_phys((void *)msi->pages);
1176 /* 32 bit address only */
1180 write_msi_msg(irq, &msg);
1185 static void tegra_msi_teardown_irq(struct msi_chip *chip, unsigned int irq)
1187 struct tegra_msi *msi = to_tegra_msi(chip);
1188 struct irq_data *d = irq_get_irq_data(irq);
1190 tegra_msi_free(msi, d->hwirq);
1193 static struct irq_chip tegra_msi_irq_chip = {
1194 .name = "Tegra PCIe MSI",
1195 .irq_enable = unmask_msi_irq,
1196 .irq_disable = mask_msi_irq,
1197 .irq_mask = mask_msi_irq,
1198 .irq_unmask = unmask_msi_irq,
1201 static int tegra_msi_map(struct irq_domain *domain, unsigned int irq,
1202 irq_hw_number_t hwirq)
1204 irq_set_chip_and_handler(irq, &tegra_msi_irq_chip, handle_simple_irq);
1205 irq_set_chip_data(irq, domain->host_data);
1206 set_irq_flags(irq, IRQF_VALID);
1208 tegra_cpuidle_pcie_irqs_in_use();
1213 static const struct irq_domain_ops msi_domain_ops = {
1214 .map = tegra_msi_map,
1217 static int tegra_pcie_enable_msi(struct tegra_pcie *pcie)
1219 struct platform_device *pdev = to_platform_device(pcie->dev);
1220 const struct tegra_pcie_soc_data *soc = pcie->soc_data;
1221 struct tegra_msi *msi = &pcie->msi;
1226 mutex_init(&msi->lock);
1228 msi->chip.dev = pcie->dev;
1229 msi->chip.setup_irq = tegra_msi_setup_irq;
1230 msi->chip.teardown_irq = tegra_msi_teardown_irq;
1232 msi->domain = irq_domain_add_linear(pcie->dev->of_node, INT_PCI_MSI_NR,
1233 &msi_domain_ops, &msi->chip);
1235 dev_err(&pdev->dev, "failed to create IRQ domain\n");
1239 err = platform_get_irq_byname(pdev, "msi");
1241 dev_err(&pdev->dev, "failed to get IRQ: %d\n", err);
1247 err = request_irq(msi->irq, tegra_pcie_msi_irq, 0,
1248 tegra_msi_irq_chip.name, pcie);
1250 dev_err(&pdev->dev, "failed to request IRQ: %d\n", err);
1254 /* setup AFI/FPCI range */
1255 msi->pages = __get_free_pages(GFP_KERNEL, 0);
1256 base = virt_to_phys((void *)msi->pages);
1258 afi_writel(pcie, base >> soc->msi_base_shift, AFI_MSI_FPCI_BAR_ST);
1259 afi_writel(pcie, base, AFI_MSI_AXI_BAR_ST);
1260 /* this register is in 4K increments */
1261 afi_writel(pcie, 1, AFI_MSI_BAR_SZ);
1263 /* enable all MSI vectors */
1264 afi_writel(pcie, 0xffffffff, AFI_MSI_EN_VEC0);
1265 afi_writel(pcie, 0xffffffff, AFI_MSI_EN_VEC1);
1266 afi_writel(pcie, 0xffffffff, AFI_MSI_EN_VEC2);
1267 afi_writel(pcie, 0xffffffff, AFI_MSI_EN_VEC3);
1268 afi_writel(pcie, 0xffffffff, AFI_MSI_EN_VEC4);
1269 afi_writel(pcie, 0xffffffff, AFI_MSI_EN_VEC5);
1270 afi_writel(pcie, 0xffffffff, AFI_MSI_EN_VEC6);
1271 afi_writel(pcie, 0xffffffff, AFI_MSI_EN_VEC7);
1273 /* and unmask the MSI interrupt */
1274 reg = afi_readl(pcie, AFI_INTR_MASK);
1275 reg |= AFI_INTR_MASK_MSI_MASK;
1276 afi_writel(pcie, reg, AFI_INTR_MASK);
1281 irq_domain_remove(msi->domain);
1285 static int tegra_pcie_disable_msi(struct tegra_pcie *pcie)
1287 struct tegra_msi *msi = &pcie->msi;
1288 unsigned int i, irq;
1291 /* mask the MSI interrupt */
1292 value = afi_readl(pcie, AFI_INTR_MASK);
1293 value &= ~AFI_INTR_MASK_MSI_MASK;
1294 afi_writel(pcie, value, AFI_INTR_MASK);
1296 /* disable all MSI vectors */
1297 afi_writel(pcie, 0, AFI_MSI_EN_VEC0);
1298 afi_writel(pcie, 0, AFI_MSI_EN_VEC1);
1299 afi_writel(pcie, 0, AFI_MSI_EN_VEC2);
1300 afi_writel(pcie, 0, AFI_MSI_EN_VEC3);
1301 afi_writel(pcie, 0, AFI_MSI_EN_VEC4);
1302 afi_writel(pcie, 0, AFI_MSI_EN_VEC5);
1303 afi_writel(pcie, 0, AFI_MSI_EN_VEC6);
1304 afi_writel(pcie, 0, AFI_MSI_EN_VEC7);
1306 free_pages(msi->pages, 0);
1309 free_irq(msi->irq, pcie);
1311 for (i = 0; i < INT_PCI_MSI_NR; i++) {
1312 irq = irq_find_mapping(msi->domain, i);
1314 irq_dispose_mapping(irq);
1317 irq_domain_remove(msi->domain);
1322 static int tegra_pcie_get_xbar_config(struct tegra_pcie *pcie, u32 lanes,
1325 struct device_node *np = pcie->dev->of_node;
1327 if (of_device_is_compatible(np, "nvidia,tegra30-pcie")) {
1330 dev_info(pcie->dev, "4x1, 2x1 configuration\n");
1331 *xbar = AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_420;
1335 dev_info(pcie->dev, "2x3 configuration\n");
1336 *xbar = AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_222;
1340 dev_info(pcie->dev, "4x1, 1x2 configuration\n");
1341 *xbar = AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_411;
1344 } else if (of_device_is_compatible(np, "nvidia,tegra20-pcie")) {
1347 dev_info(pcie->dev, "single-mode configuration\n");
1348 *xbar = AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_SINGLE;
1352 dev_info(pcie->dev, "dual-mode configuration\n");
1353 *xbar = AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_DUAL;
1362 * Check whether a given set of supplies is available in a device tree node.
1363 * This is used to check whether the new or the legacy device tree bindings
1366 static bool of_regulator_bulk_available(struct device_node *np,
1367 struct regulator_bulk_data *supplies,
1368 unsigned int num_supplies)
1373 for (i = 0; i < num_supplies; i++) {
1374 snprintf(property, 32, "%s-supply", supplies[i].supply);
1376 if (of_find_property(np, property, NULL) == NULL)
1384 * Old versions of the device tree binding for this device used a set of power
1385 * supplies that didn't match the hardware inputs. This happened to work for a
1386 * number of cases but is not future proof. However to preserve backwards-
1387 * compatibility with old device trees, this function will try to use the old
1390 static int tegra_pcie_get_legacy_regulators(struct tegra_pcie *pcie)
1392 struct device_node *np = pcie->dev->of_node;
1394 if (of_device_is_compatible(np, "nvidia,tegra30-pcie"))
1395 pcie->num_supplies = 3;
1396 else if (of_device_is_compatible(np, "nvidia,tegra20-pcie"))
1397 pcie->num_supplies = 2;
1399 if (pcie->num_supplies == 0) {
1400 dev_err(pcie->dev, "device %s not supported in legacy mode\n",
1405 pcie->supplies = devm_kcalloc(pcie->dev, pcie->num_supplies,
1406 sizeof(*pcie->supplies),
1408 if (!pcie->supplies)
1411 pcie->supplies[0].supply = "pex-clk";
1412 pcie->supplies[1].supply = "vdd";
1414 if (pcie->num_supplies > 2)
1415 pcie->supplies[2].supply = "avdd";
1417 return devm_regulator_bulk_get(pcie->dev, pcie->num_supplies,
1422 * Obtains the list of regulators required for a particular generation of the
1425 * This would've been nice to do simply by providing static tables for use
1426 * with the regulator_bulk_*() API, but unfortunately Tegra30 is a bit quirky
1427 * in that it has two pairs or AVDD_PEX and VDD_PEX supplies (PEXA and PEXB)
1428 * and either seems to be optional depending on which ports are being used.
1430 static int tegra_pcie_get_regulators(struct tegra_pcie *pcie, u32 lane_mask)
1432 struct device_node *np = pcie->dev->of_node;
1435 if (of_device_is_compatible(np, "nvidia,tegra30-pcie")) {
1436 bool need_pexa = false, need_pexb = false;
1438 /* VDD_PEXA and AVDD_PEXA supply lanes 0 to 3 */
1439 if (lane_mask & 0x0f)
1442 /* VDD_PEXB and AVDD_PEXB supply lanes 4 to 5 */
1443 if (lane_mask & 0x30)
1446 pcie->num_supplies = 4 + (need_pexa ? 2 : 0) +
1447 (need_pexb ? 2 : 0);
1449 pcie->supplies = devm_kcalloc(pcie->dev, pcie->num_supplies,
1450 sizeof(*pcie->supplies),
1452 if (!pcie->supplies)
1455 pcie->supplies[i++].supply = "avdd-pex-pll";
1456 pcie->supplies[i++].supply = "hvdd-pex";
1457 pcie->supplies[i++].supply = "vddio-pex-ctl";
1458 pcie->supplies[i++].supply = "avdd-plle";
1461 pcie->supplies[i++].supply = "avdd-pexa";
1462 pcie->supplies[i++].supply = "vdd-pexa";
1466 pcie->supplies[i++].supply = "avdd-pexb";
1467 pcie->supplies[i++].supply = "vdd-pexb";
1469 } else if (of_device_is_compatible(np, "nvidia,tegra20-pcie")) {
1470 pcie->num_supplies = 5;
1472 pcie->supplies = devm_kcalloc(pcie->dev, pcie->num_supplies,
1473 sizeof(*pcie->supplies),
1475 if (!pcie->supplies)
1478 pcie->supplies[0].supply = "avdd-pex";
1479 pcie->supplies[1].supply = "vdd-pex";
1480 pcie->supplies[2].supply = "avdd-pex-pll";
1481 pcie->supplies[3].supply = "avdd-plle";
1482 pcie->supplies[4].supply = "vddio-pex-clk";
1485 if (of_regulator_bulk_available(pcie->dev->of_node, pcie->supplies,
1486 pcie->num_supplies))
1487 return devm_regulator_bulk_get(pcie->dev, pcie->num_supplies,
1491 * If not all regulators are available for this new scheme, assume
1492 * that the device tree complies with an older version of the device
1495 dev_info(pcie->dev, "using legacy DT binding for power supplies\n");
1497 devm_kfree(pcie->dev, pcie->supplies);
1498 pcie->num_supplies = 0;
1500 return tegra_pcie_get_legacy_regulators(pcie);
1503 static int tegra_pcie_parse_dt(struct tegra_pcie *pcie)
1505 const struct tegra_pcie_soc_data *soc = pcie->soc_data;
1506 struct device_node *np = pcie->dev->of_node, *port;
1507 struct of_pci_range_parser parser;
1508 struct of_pci_range range;
1509 u32 lanes = 0, mask = 0;
1510 unsigned int lane = 0;
1511 struct resource res;
1514 if (of_pci_range_parser_init(&parser, np)) {
1515 dev_err(pcie->dev, "missing \"ranges\" property\n");
1519 for_each_of_pci_range(&parser, &range) {
1520 of_pci_range_to_resource(&range, np, &res);
1522 switch (res.flags & IORESOURCE_TYPE_BITS) {
1524 memcpy(&pcie->io, &res, sizeof(res));
1525 pcie->io.name = "I/O";
1528 case IORESOURCE_MEM:
1529 if (res.flags & IORESOURCE_PREFETCH) {
1530 memcpy(&pcie->prefetch, &res, sizeof(res));
1531 pcie->prefetch.name = "PREFETCH";
1533 memcpy(&pcie->mem, &res, sizeof(res));
1534 pcie->mem.name = "MEM";
1540 err = of_pci_parse_bus_range(np, &pcie->busn);
1542 dev_err(pcie->dev, "failed to parse ranges property: %d\n",
1544 pcie->busn.name = np->name;
1545 pcie->busn.start = 0;
1546 pcie->busn.end = 0xff;
1547 pcie->busn.flags = IORESOURCE_BUS;
1550 /* parse root ports */
1551 for_each_child_of_node(np, port) {
1552 struct tegra_pcie_port *rp;
1556 err = of_pci_get_devfn(port);
1558 dev_err(pcie->dev, "failed to parse address: %d\n",
1563 index = PCI_SLOT(err);
1565 if (index < 1 || index > soc->num_ports) {
1566 dev_err(pcie->dev, "invalid port number: %d\n", index);
1572 err = of_property_read_u32(port, "nvidia,num-lanes", &value);
1574 dev_err(pcie->dev, "failed to parse # of lanes: %d\n",
1580 dev_err(pcie->dev, "invalid # of lanes: %u\n", value);
1584 lanes |= value << (index << 3);
1586 if (!of_device_is_available(port)) {
1591 mask |= ((1 << value) - 1) << lane;
1594 rp = devm_kzalloc(pcie->dev, sizeof(*rp), GFP_KERNEL);
1598 err = of_address_to_resource(port, 0, &rp->regs);
1600 dev_err(pcie->dev, "failed to parse address: %d\n",
1605 INIT_LIST_HEAD(&rp->list);
1610 rp->base = devm_ioremap_resource(pcie->dev, &rp->regs);
1611 if (IS_ERR(rp->base))
1612 return PTR_ERR(rp->base);
1614 list_add_tail(&rp->list, &pcie->ports);
1617 err = tegra_pcie_get_xbar_config(pcie, lanes, &pcie->xbar_config);
1619 dev_err(pcie->dev, "invalid lane configuration\n");
1623 err = tegra_pcie_get_regulators(pcie, mask);
1631 * FIXME: If there are no PCIe cards attached, then calling this function
1632 * can result in the increase of the bootup time as there are big timeout
1635 #define TEGRA_PCIE_LINKUP_TIMEOUT 200 /* up to 1.2 seconds */
1636 static bool tegra_pcie_port_check_link(struct tegra_pcie_port *port)
1638 unsigned int retries = 3;
1639 unsigned long value;
1642 unsigned int timeout = TEGRA_PCIE_LINKUP_TIMEOUT;
1645 value = readl(port->base + RP_VEND_XP);
1647 if (value & RP_VEND_XP_DL_UP)
1650 usleep_range(1000, 2000);
1651 } while (--timeout);
1654 dev_err(port->pcie->dev, "link %u down, retrying\n",
1659 timeout = TEGRA_PCIE_LINKUP_TIMEOUT;
1662 value = readl(port->base + RP_LINK_CONTROL_STATUS);
1664 if (value & RP_LINK_CONTROL_STATUS_DL_LINK_ACTIVE)
1667 usleep_range(1000, 2000);
1668 } while (--timeout);
1671 tegra_pcie_port_reset(port);
1672 } while (--retries);
1677 static int tegra_pcie_enable(struct tegra_pcie *pcie)
1679 struct tegra_pcie_port *port, *tmp;
1682 list_for_each_entry_safe(port, tmp, &pcie->ports, list) {
1683 dev_info(pcie->dev, "probing port %u, using %u lanes\n",
1684 port->index, port->lanes);
1686 tegra_pcie_port_enable(port);
1688 if (tegra_pcie_port_check_link(port))
1691 dev_info(pcie->dev, "link %u down, ignoring\n", port->index);
1693 tegra_pcie_port_disable(port);
1694 tegra_pcie_port_free(port);
1697 memset(&hw, 0, sizeof(hw));
1699 hw.nr_controllers = 1;
1700 hw.private_data = (void **)&pcie;
1701 hw.setup = tegra_pcie_setup;
1702 hw.map_irq = tegra_pcie_map_irq;
1703 hw.add_bus = tegra_pcie_add_bus;
1704 hw.scan = tegra_pcie_scan_bus;
1705 hw.ops = &tegra_pcie_ops;
1707 pci_common_init_dev(pcie->dev, &hw);
1712 static const struct tegra_pcie_soc_data tegra20_pcie_data = {
1714 .msi_base_shift = 0,
1715 .pads_pll_ctl = PADS_PLL_CTL_TEGRA20,
1716 .tx_ref_sel = PADS_PLL_CTL_TXCLKREF_DIV10,
1717 .has_pex_clkreq_en = false,
1718 .has_pex_bias_ctrl = false,
1719 .has_intr_prsnt_sense = false,
1720 .has_cml_clk = false,
1723 static const struct tegra_pcie_soc_data tegra30_pcie_data = {
1725 .msi_base_shift = 8,
1726 .pads_pll_ctl = PADS_PLL_CTL_TEGRA30,
1727 .tx_ref_sel = PADS_PLL_CTL_TXCLKREF_BUF_EN,
1728 .has_pex_clkreq_en = true,
1729 .has_pex_bias_ctrl = true,
1730 .has_intr_prsnt_sense = true,
1731 .has_cml_clk = true,
1734 static const struct of_device_id tegra_pcie_of_match[] = {
1735 { .compatible = "nvidia,tegra30-pcie", .data = &tegra30_pcie_data },
1736 { .compatible = "nvidia,tegra20-pcie", .data = &tegra20_pcie_data },
1739 MODULE_DEVICE_TABLE(of, tegra_pcie_of_match);
1741 static int tegra_pcie_probe(struct platform_device *pdev)
1743 const struct of_device_id *match;
1744 struct tegra_pcie *pcie;
1747 match = of_match_device(tegra_pcie_of_match, &pdev->dev);
1751 pcie = devm_kzalloc(&pdev->dev, sizeof(*pcie), GFP_KERNEL);
1755 INIT_LIST_HEAD(&pcie->buses);
1756 INIT_LIST_HEAD(&pcie->ports);
1757 pcie->soc_data = match->data;
1758 pcie->dev = &pdev->dev;
1760 err = tegra_pcie_parse_dt(pcie);
1764 pcibios_min_mem = 0;
1766 err = tegra_pcie_get_resources(pcie);
1768 dev_err(&pdev->dev, "failed to request resources: %d\n", err);
1772 err = tegra_pcie_enable_controller(pcie);
1776 /* setup the AFI address translations */
1777 tegra_pcie_setup_translations(pcie);
1779 if (IS_ENABLED(CONFIG_PCI_MSI)) {
1780 err = tegra_pcie_enable_msi(pcie);
1783 "failed to enable MSI support: %d\n",
1789 err = tegra_pcie_enable(pcie);
1791 dev_err(&pdev->dev, "failed to enable PCIe ports: %d\n", err);
1795 platform_set_drvdata(pdev, pcie);
1799 if (IS_ENABLED(CONFIG_PCI_MSI))
1800 tegra_pcie_disable_msi(pcie);
1802 tegra_pcie_put_resources(pcie);
1806 static struct platform_driver tegra_pcie_driver = {
1808 .name = "tegra-pcie",
1809 .owner = THIS_MODULE,
1810 .of_match_table = tegra_pcie_of_match,
1811 .suppress_bind_attrs = true,
1813 .probe = tegra_pcie_probe,
1815 module_platform_driver(tegra_pcie_driver);
1817 MODULE_AUTHOR("Thierry Reding <treding@nvidia.com>");
1818 MODULE_DESCRIPTION("NVIDIA Tegra PCIe driver");
1819 MODULE_LICENSE("GPLv2");