2 * arch/arm/mach-tegra/pci.c
4 * PCIe host controller driver for TEGRA(2) SOCs
6 * Copyright (c) 2010, CompuLab, Ltd.
7 * Author: Mike Rapoport <mike@compulab.co.il>
9 * Based on NVIDIA PCIe driver
10 * Copyright (c) 2008-2009, NVIDIA Corporation.
12 * Bits taken from arch/arm/mach-dove/pcie.c
14 * This program is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License as published by
16 * the Free Software Foundation; either version 2 of the License, or
17 * (at your option) any later version.
19 * This program is distributed in the hope that it will be useful, but WITHOUT
20 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
21 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
24 * You should have received a copy of the GNU General Public License along
25 * with this program; if not, write to the Free Software Foundation, Inc.,
26 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
29 #include <linux/kernel.h>
30 #include <linux/pci.h>
31 #include <linux/interrupt.h>
32 #include <linux/irq.h>
33 #include <linux/clk.h>
34 #include <linux/delay.h>
35 #include <linux/export.h>
37 #include <asm/sizes.h>
38 #include <asm/mach/pci.h>
40 #include <mach/iomap.h>
42 #include <mach/powergate.h>
46 /* register definitions */
47 #define AFI_OFFSET 0x3800
48 #define PADS_OFFSET 0x3000
49 #define RP0_OFFSET 0x0000
50 #define RP1_OFFSET 0x1000
52 #define AFI_AXI_BAR0_SZ 0x00
53 #define AFI_AXI_BAR1_SZ 0x04
54 #define AFI_AXI_BAR2_SZ 0x08
55 #define AFI_AXI_BAR3_SZ 0x0c
56 #define AFI_AXI_BAR4_SZ 0x10
57 #define AFI_AXI_BAR5_SZ 0x14
59 #define AFI_AXI_BAR0_START 0x18
60 #define AFI_AXI_BAR1_START 0x1c
61 #define AFI_AXI_BAR2_START 0x20
62 #define AFI_AXI_BAR3_START 0x24
63 #define AFI_AXI_BAR4_START 0x28
64 #define AFI_AXI_BAR5_START 0x2c
66 #define AFI_FPCI_BAR0 0x30
67 #define AFI_FPCI_BAR1 0x34
68 #define AFI_FPCI_BAR2 0x38
69 #define AFI_FPCI_BAR3 0x3c
70 #define AFI_FPCI_BAR4 0x40
71 #define AFI_FPCI_BAR5 0x44
73 #define AFI_CACHE_BAR0_SZ 0x48
74 #define AFI_CACHE_BAR0_ST 0x4c
75 #define AFI_CACHE_BAR1_SZ 0x50
76 #define AFI_CACHE_BAR1_ST 0x54
78 #define AFI_MSI_BAR_SZ 0x60
79 #define AFI_MSI_FPCI_BAR_ST 0x64
80 #define AFI_MSI_AXI_BAR_ST 0x68
82 #define AFI_CONFIGURATION 0xac
83 #define AFI_CONFIGURATION_EN_FPCI (1 << 0)
85 #define AFI_FPCI_ERROR_MASKS 0xb0
87 #define AFI_INTR_MASK 0xb4
88 #define AFI_INTR_MASK_INT_MASK (1 << 0)
89 #define AFI_INTR_MASK_MSI_MASK (1 << 8)
91 #define AFI_INTR_CODE 0xb8
92 #define AFI_INTR_CODE_MASK 0xf
93 #define AFI_INTR_MASTER_ABORT 4
94 #define AFI_INTR_LEGACY 6
96 #define AFI_INTR_SIGNATURE 0xbc
97 #define AFI_SM_INTR_ENABLE 0xc4
99 #define AFI_AFI_INTR_ENABLE 0xc8
100 #define AFI_INTR_EN_INI_SLVERR (1 << 0)
101 #define AFI_INTR_EN_INI_DECERR (1 << 1)
102 #define AFI_INTR_EN_TGT_SLVERR (1 << 2)
103 #define AFI_INTR_EN_TGT_DECERR (1 << 3)
104 #define AFI_INTR_EN_TGT_WRERR (1 << 4)
105 #define AFI_INTR_EN_DFPCI_DECERR (1 << 5)
106 #define AFI_INTR_EN_AXI_DECERR (1 << 6)
107 #define AFI_INTR_EN_FPCI_TIMEOUT (1 << 7)
109 #define AFI_PCIE_CONFIG 0x0f8
110 #define AFI_PCIE_CONFIG_PCIEC0_DISABLE_DEVICE (1 << 1)
111 #define AFI_PCIE_CONFIG_PCIEC1_DISABLE_DEVICE (1 << 2)
112 #define AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_MASK (0xf << 20)
113 #define AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_SINGLE (0x0 << 20)
114 #define AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_DUAL (0x1 << 20)
116 #define AFI_FUSE 0x104
117 #define AFI_FUSE_PCIE_T0_GEN2_DIS (1 << 2)
119 #define AFI_PEX0_CTRL 0x110
120 #define AFI_PEX1_CTRL 0x118
121 #define AFI_PEX_CTRL_RST (1 << 0)
122 #define AFI_PEX_CTRL_REFCLK_EN (1 << 3)
124 #define RP_VEND_XP 0x00000F00
125 #define RP_VEND_XP_DL_UP (1 << 30)
127 #define RP_LINK_CONTROL_STATUS 0x00000090
128 #define RP_LINK_CONTROL_STATUS_LINKSTAT_MASK 0x3fff0000
130 #define PADS_CTL_SEL 0x0000009C
132 #define PADS_CTL 0x000000A0
133 #define PADS_CTL_IDDQ_1L (1 << 0)
134 #define PADS_CTL_TX_DATA_EN_1L (1 << 6)
135 #define PADS_CTL_RX_DATA_EN_1L (1 << 10)
137 #define PADS_PLL_CTL 0x000000B8
138 #define PADS_PLL_CTL_RST_B4SM (1 << 1)
139 #define PADS_PLL_CTL_LOCKDET (1 << 8)
140 #define PADS_PLL_CTL_REFCLK_MASK (0x3 << 16)
141 #define PADS_PLL_CTL_REFCLK_INTERNAL_CML (0 << 16)
142 #define PADS_PLL_CTL_REFCLK_INTERNAL_CMOS (1 << 16)
143 #define PADS_PLL_CTL_REFCLK_EXTERNAL (2 << 16)
144 #define PADS_PLL_CTL_TXCLKREF_MASK (0x1 << 20)
145 #define PADS_PLL_CTL_TXCLKREF_DIV10 (0 << 20)
146 #define PADS_PLL_CTL_TXCLKREF_DIV5 (1 << 20)
148 /* PMC access is required for PCIE xclk (un)clamping */
149 #define PMC_SCRATCH42 0x144
150 #define PMC_SCRATCH42_PCX_CLAMP (1 << 0)
152 static void __iomem *reg_pmc_base = IO_ADDRESS(TEGRA_PMC_BASE);
154 #define pmc_writel(value, reg) \
155 __raw_writel(value, reg_pmc_base + (reg))
156 #define pmc_readl(reg) \
157 __raw_readl(reg_pmc_base + (reg))
160 * Tegra2 defines 1GB in the AXI address map for PCIe.
162 * That address space is split into different regions, with sizes and
163 * offsets as follows:
165 * 0x80000000 - 0x80003fff - PCI controller registers
166 * 0x80004000 - 0x80103fff - PCI configuration space
167 * 0x80104000 - 0x80203fff - PCI extended configuration space
168 * 0x80203fff - 0x803fffff - unused
169 * 0x80400000 - 0x8040ffff - downstream IO
170 * 0x80410000 - 0x8fffffff - unused
171 * 0x90000000 - 0x9fffffff - non-prefetchable memory
172 * 0xa0000000 - 0xbfffffff - prefetchable memory
174 #define PCIE_REGS_SZ SZ_16K
175 #define PCIE_CFG_OFF PCIE_REGS_SZ
176 #define PCIE_CFG_SZ SZ_1M
177 #define PCIE_EXT_CFG_OFF (PCIE_CFG_SZ + PCIE_CFG_OFF)
178 #define PCIE_EXT_CFG_SZ SZ_1M
179 #define PCIE_IOMAP_SZ (PCIE_REGS_SZ + PCIE_CFG_SZ + PCIE_EXT_CFG_SZ)
181 #define MEM_BASE_0 (TEGRA_PCIE_BASE + SZ_256M)
182 #define MEM_SIZE_0 SZ_128M
183 #define MEM_BASE_1 (MEM_BASE_0 + MEM_SIZE_0)
184 #define MEM_SIZE_1 SZ_128M
185 #define PREFETCH_MEM_BASE_0 (MEM_BASE_1 + MEM_SIZE_1)
186 #define PREFETCH_MEM_SIZE_0 SZ_128M
187 #define PREFETCH_MEM_BASE_1 (PREFETCH_MEM_BASE_0 + PREFETCH_MEM_SIZE_0)
188 #define PREFETCH_MEM_SIZE_1 SZ_128M
190 #define PCIE_CONF_BUS(b) ((b) << 16)
191 #define PCIE_CONF_DEV(d) ((d) << 11)
192 #define PCIE_CONF_FUNC(f) ((f) << 8)
193 #define PCIE_CONF_REG(r) \
194 (((r) & ~0x3) | (((r) < 256) ? PCIE_CFG_OFF : PCIE_EXT_CFG_OFF))
196 struct tegra_pcie_port {
203 char mem_space_name[16];
204 char prefetch_space_name[20];
205 struct resource res[2];
208 struct tegra_pcie_info {
209 struct tegra_pcie_port port[2];
213 struct resource res_mmio;
217 struct clk *pcie_xclk;
221 static struct tegra_pcie_info tegra_pcie;
223 static inline void afi_writel(u32 value, unsigned long offset)
225 writel(value, offset + AFI_OFFSET + tegra_pcie.regs);
228 static inline u32 afi_readl(unsigned long offset)
230 return readl(offset + AFI_OFFSET + tegra_pcie.regs);
233 static inline void pads_writel(u32 value, unsigned long offset)
235 writel(value, offset + PADS_OFFSET + tegra_pcie.regs);
238 static inline u32 pads_readl(unsigned long offset)
240 return readl(offset + PADS_OFFSET + tegra_pcie.regs);
243 static struct tegra_pcie_port *bus_to_port(int bus)
247 for (i = tegra_pcie.num_ports - 1; i >= 0; i--) {
248 int rbus = tegra_pcie.port[i].root_bus_nr;
249 if (rbus != -1 && rbus == bus)
253 return i >= 0 ? tegra_pcie.port + i : NULL;
256 static int tegra_pcie_read_conf(struct pci_bus *bus, unsigned int devfn,
257 int where, int size, u32 *val)
259 struct tegra_pcie_port *pp = bus_to_port(bus->number);
265 return PCIBIOS_DEVICE_NOT_FOUND;
268 addr = pp->base + (where & ~0x3);
270 addr = tegra_pcie.regs + (PCIE_CONF_BUS(bus->number) +
271 PCIE_CONF_DEV(PCI_SLOT(devfn)) +
272 PCIE_CONF_FUNC(PCI_FUNC(devfn)) +
273 PCIE_CONF_REG(where));
279 *val = (*val >> (8 * (where & 3))) & 0xff;
281 *val = (*val >> (8 * (where & 3))) & 0xffff;
283 return PCIBIOS_SUCCESSFUL;
286 static int tegra_pcie_write_conf(struct pci_bus *bus, unsigned int devfn,
287 int where, int size, u32 val)
289 struct tegra_pcie_port *pp = bus_to_port(bus->number);
297 return PCIBIOS_DEVICE_NOT_FOUND;
299 addr = pp->base + (where & ~0x3);
301 addr = tegra_pcie.regs + (PCIE_CONF_BUS(bus->number) +
302 PCIE_CONF_DEV(PCI_SLOT(devfn)) +
303 PCIE_CONF_FUNC(PCI_FUNC(devfn)) +
304 PCIE_CONF_REG(where));
309 return PCIBIOS_SUCCESSFUL;
313 mask = ~(0xffff << ((where & 0x3) * 8));
315 mask = ~(0xff << ((where & 0x3) * 8));
317 return PCIBIOS_BAD_REGISTER_NUMBER;
319 tmp = readl(addr) & mask;
320 tmp |= val << ((where & 0x3) * 8);
323 return PCIBIOS_SUCCESSFUL;
326 static struct pci_ops tegra_pcie_ops = {
327 .read = tegra_pcie_read_conf,
328 .write = tegra_pcie_write_conf,
331 static void __devinit tegra_pcie_fixup_bridge(struct pci_dev *dev)
335 if ((dev->class >> 16) == PCI_BASE_CLASS_BRIDGE) {
336 pci_read_config_word(dev, PCI_COMMAND, ®);
337 reg |= (PCI_COMMAND_IO | PCI_COMMAND_MEMORY |
338 PCI_COMMAND_MASTER | PCI_COMMAND_SERR);
339 pci_write_config_word(dev, PCI_COMMAND, reg);
342 DECLARE_PCI_FIXUP_FINAL(PCI_ANY_ID, PCI_ANY_ID, tegra_pcie_fixup_bridge);
344 /* Tegra PCIE root complex wrongly reports device class */
345 static void __devinit tegra_pcie_fixup_class(struct pci_dev *dev)
347 dev->class = PCI_CLASS_BRIDGE_PCI << 8;
349 DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_NVIDIA, 0x0bf0, tegra_pcie_fixup_class);
350 DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_NVIDIA, 0x0bf1, tegra_pcie_fixup_class);
352 /* Tegra PCIE requires relaxed ordering */
353 static void __devinit tegra_pcie_relax_enable(struct pci_dev *dev)
355 pcie_capability_set_word(dev, PCI_EXP_DEVCTL, PCI_EXP_DEVCTL_RELAX_EN);
357 DECLARE_PCI_FIXUP_FINAL(PCI_ANY_ID, PCI_ANY_ID, tegra_pcie_relax_enable);
359 static int tegra_pcie_setup(int nr, struct pci_sys_data *sys)
361 struct tegra_pcie_port *pp;
363 if (nr >= tegra_pcie.num_ports)
366 pp = tegra_pcie.port + nr;
367 pp->root_bus_nr = sys->busnr;
369 pci_ioremap_io(nr * SZ_64K, TEGRA_PCIE_IO_BASE);
374 snprintf(pp->mem_space_name, sizeof(pp->mem_space_name),
375 "PCIe %d MEM", pp->index);
376 pp->mem_space_name[sizeof(pp->mem_space_name) - 1] = 0;
377 pp->res[0].name = pp->mem_space_name;
378 if (pp->index == 0) {
379 pp->res[0].start = MEM_BASE_0;
380 pp->res[0].end = pp->res[0].start + MEM_SIZE_0 - 1;
382 pp->res[0].start = MEM_BASE_1;
383 pp->res[0].end = pp->res[0].start + MEM_SIZE_1 - 1;
385 pp->res[0].flags = IORESOURCE_MEM;
386 if (request_resource(&iomem_resource, &pp->res[0]))
387 panic("Request PCIe Memory resource failed\n");
388 pci_add_resource_offset(&sys->resources, &pp->res[0], sys->mem_offset);
391 * IORESOURCE_MEM | IORESOURCE_PREFETCH
393 snprintf(pp->prefetch_space_name, sizeof(pp->prefetch_space_name),
394 "PCIe %d PREFETCH MEM", pp->index);
395 pp->prefetch_space_name[sizeof(pp->prefetch_space_name) - 1] = 0;
396 pp->res[1].name = pp->prefetch_space_name;
397 if (pp->index == 0) {
398 pp->res[1].start = PREFETCH_MEM_BASE_0;
399 pp->res[1].end = pp->res[1].start + PREFETCH_MEM_SIZE_0 - 1;
401 pp->res[1].start = PREFETCH_MEM_BASE_1;
402 pp->res[1].end = pp->res[1].start + PREFETCH_MEM_SIZE_1 - 1;
404 pp->res[1].flags = IORESOURCE_MEM | IORESOURCE_PREFETCH;
405 if (request_resource(&iomem_resource, &pp->res[1]))
406 panic("Request PCIe Prefetch Memory resource failed\n");
407 pci_add_resource_offset(&sys->resources, &pp->res[1], sys->mem_offset);
412 static int tegra_pcie_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
414 return INT_PCIE_INTR;
417 static struct pci_bus __init *tegra_pcie_scan_bus(int nr,
418 struct pci_sys_data *sys)
420 struct tegra_pcie_port *pp;
422 if (nr >= tegra_pcie.num_ports)
425 pp = tegra_pcie.port + nr;
426 pp->root_bus_nr = sys->busnr;
428 return pci_scan_root_bus(NULL, sys->busnr, &tegra_pcie_ops, sys,
432 static struct hw_pci tegra_pcie_hw __initdata = {
434 .setup = tegra_pcie_setup,
435 .scan = tegra_pcie_scan_bus,
436 .map_irq = tegra_pcie_map_irq,
440 static irqreturn_t tegra_pcie_isr(int irq, void *arg)
442 const char *err_msg[] = {
449 "Response decoding error",
450 "AXI response decoding error",
451 "Transcation timeout",
456 code = afi_readl(AFI_INTR_CODE) & AFI_INTR_CODE_MASK;
457 signature = afi_readl(AFI_INTR_SIGNATURE);
458 afi_writel(0, AFI_INTR_CODE);
460 if (code == AFI_INTR_LEGACY)
463 if (code >= ARRAY_SIZE(err_msg))
467 * do not pollute kernel log with master abort reports since they
468 * happen a lot during enumeration
470 if (code == AFI_INTR_MASTER_ABORT)
471 pr_debug("PCIE: %s, signature: %08x\n", err_msg[code], signature);
473 pr_err("PCIE: %s, signature: %08x\n", err_msg[code], signature);
478 static void tegra_pcie_setup_translations(void)
484 /* Bar 0: config Bar */
485 fpci_bar = ((u32)0xfdff << 16);
487 axi_address = TEGRA_PCIE_BASE + PCIE_CFG_OFF;
488 afi_writel(axi_address, AFI_AXI_BAR0_START);
489 afi_writel(size >> 12, AFI_AXI_BAR0_SZ);
490 afi_writel(fpci_bar, AFI_FPCI_BAR0);
492 /* Bar 1: extended config Bar */
493 fpci_bar = ((u32)0xfe1 << 20);
494 size = PCIE_EXT_CFG_SZ;
495 axi_address = TEGRA_PCIE_BASE + PCIE_EXT_CFG_OFF;
496 afi_writel(axi_address, AFI_AXI_BAR1_START);
497 afi_writel(size >> 12, AFI_AXI_BAR1_SZ);
498 afi_writel(fpci_bar, AFI_FPCI_BAR1);
500 /* Bar 2: downstream IO bar */
501 fpci_bar = ((__u32)0xfdfc << 16);
503 axi_address = TEGRA_PCIE_IO_BASE;
504 afi_writel(axi_address, AFI_AXI_BAR2_START);
505 afi_writel(size >> 12, AFI_AXI_BAR2_SZ);
506 afi_writel(fpci_bar, AFI_FPCI_BAR2);
508 /* Bar 3: prefetchable memory BAR */
509 fpci_bar = (((PREFETCH_MEM_BASE_0 >> 12) & 0x0fffffff) << 4) | 0x1;
510 size = PREFETCH_MEM_SIZE_0 + PREFETCH_MEM_SIZE_1;
511 axi_address = PREFETCH_MEM_BASE_0;
512 afi_writel(axi_address, AFI_AXI_BAR3_START);
513 afi_writel(size >> 12, AFI_AXI_BAR3_SZ);
514 afi_writel(fpci_bar, AFI_FPCI_BAR3);
516 /* Bar 4: non prefetchable memory BAR */
517 fpci_bar = (((MEM_BASE_0 >> 12) & 0x0FFFFFFF) << 4) | 0x1;
518 size = MEM_SIZE_0 + MEM_SIZE_1;
519 axi_address = MEM_BASE_0;
520 afi_writel(axi_address, AFI_AXI_BAR4_START);
521 afi_writel(size >> 12, AFI_AXI_BAR4_SZ);
522 afi_writel(fpci_bar, AFI_FPCI_BAR4);
524 /* Bar 5: NULL out the remaining BAR as it is not used */
528 afi_writel(axi_address, AFI_AXI_BAR5_START);
529 afi_writel(size >> 12, AFI_AXI_BAR5_SZ);
530 afi_writel(fpci_bar, AFI_FPCI_BAR5);
532 /* map all upstream transactions as uncached */
533 afi_writel(PHYS_OFFSET, AFI_CACHE_BAR0_ST);
534 afi_writel(0, AFI_CACHE_BAR0_SZ);
535 afi_writel(0, AFI_CACHE_BAR1_ST);
536 afi_writel(0, AFI_CACHE_BAR1_SZ);
539 afi_writel(0, AFI_MSI_FPCI_BAR_ST);
540 afi_writel(0, AFI_MSI_BAR_SZ);
541 afi_writel(0, AFI_MSI_AXI_BAR_ST);
542 afi_writel(0, AFI_MSI_BAR_SZ);
545 static int tegra_pcie_enable_controller(void)
550 /* Enable slot clock and pulse the reset signals */
551 for (i = 0, reg = AFI_PEX0_CTRL; i < 2; i++, reg += 0x8) {
552 val = afi_readl(reg) | AFI_PEX_CTRL_REFCLK_EN;
553 afi_writel(val, reg);
554 val &= ~AFI_PEX_CTRL_RST;
555 afi_writel(val, reg);
557 val = afi_readl(reg) | AFI_PEX_CTRL_RST;
558 afi_writel(val, reg);
561 /* Enable dual controller and both ports */
562 val = afi_readl(AFI_PCIE_CONFIG);
563 val &= ~(AFI_PCIE_CONFIG_PCIEC0_DISABLE_DEVICE |
564 AFI_PCIE_CONFIG_PCIEC1_DISABLE_DEVICE |
565 AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_MASK);
566 val |= AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_DUAL;
567 afi_writel(val, AFI_PCIE_CONFIG);
569 val = afi_readl(AFI_FUSE) & ~AFI_FUSE_PCIE_T0_GEN2_DIS;
570 afi_writel(val, AFI_FUSE);
572 /* Initialze internal PHY, enable up to 16 PCIE lanes */
573 pads_writel(0x0, PADS_CTL_SEL);
575 /* override IDDQ to 1 on all 4 lanes */
576 val = pads_readl(PADS_CTL) | PADS_CTL_IDDQ_1L;
577 pads_writel(val, PADS_CTL);
580 * set up PHY PLL inputs select PLLE output as refclock,
581 * set TX ref sel to div10 (not div5)
583 val = pads_readl(PADS_PLL_CTL);
584 val &= ~(PADS_PLL_CTL_REFCLK_MASK | PADS_PLL_CTL_TXCLKREF_MASK);
585 val |= (PADS_PLL_CTL_REFCLK_INTERNAL_CML | PADS_PLL_CTL_TXCLKREF_DIV10);
586 pads_writel(val, PADS_PLL_CTL);
588 /* take PLL out of reset */
589 val = pads_readl(PADS_PLL_CTL) | PADS_PLL_CTL_RST_B4SM;
590 pads_writel(val, PADS_PLL_CTL);
593 * Hack, set the clock voltage to the DEFAULT provided by hw folks.
594 * This doesn't exist in the documentation
596 pads_writel(0xfa5cfa5c, 0xc8);
598 /* Wait for the PLL to lock */
601 val = pads_readl(PADS_PLL_CTL);
602 usleep_range(1000, 1000);
603 if (--timeout == 0) {
604 pr_err("Tegra PCIe error: timeout waiting for PLL\n");
607 } while (!(val & PADS_PLL_CTL_LOCKDET));
609 /* turn off IDDQ override */
610 val = pads_readl(PADS_CTL) & ~PADS_CTL_IDDQ_1L;
611 pads_writel(val, PADS_CTL);
613 /* enable TX/RX data */
614 val = pads_readl(PADS_CTL);
615 val |= (PADS_CTL_TX_DATA_EN_1L | PADS_CTL_RX_DATA_EN_1L);
616 pads_writel(val, PADS_CTL);
618 /* Take the PCIe interface module out of reset */
619 tegra_periph_reset_deassert(tegra_pcie.pcie_xclk);
621 /* Finally enable PCIe */
622 val = afi_readl(AFI_CONFIGURATION) | AFI_CONFIGURATION_EN_FPCI;
623 afi_writel(val, AFI_CONFIGURATION);
625 val = (AFI_INTR_EN_INI_SLVERR | AFI_INTR_EN_INI_DECERR |
626 AFI_INTR_EN_TGT_SLVERR | AFI_INTR_EN_TGT_DECERR |
627 AFI_INTR_EN_TGT_WRERR | AFI_INTR_EN_DFPCI_DECERR);
628 afi_writel(val, AFI_AFI_INTR_ENABLE);
629 afi_writel(0xffffffff, AFI_SM_INTR_ENABLE);
631 /* FIXME: No MSI for now, only INT */
632 afi_writel(AFI_INTR_MASK_INT_MASK, AFI_INTR_MASK);
634 /* Disable all execptions */
635 afi_writel(0, AFI_FPCI_ERROR_MASKS);
640 static void tegra_pcie_xclk_clamp(bool clamp)
644 reg = pmc_readl(PMC_SCRATCH42) & ~PMC_SCRATCH42_PCX_CLAMP;
647 reg |= PMC_SCRATCH42_PCX_CLAMP;
649 pmc_writel(reg, PMC_SCRATCH42);
652 static void tegra_pcie_power_off(void)
654 tegra_periph_reset_assert(tegra_pcie.pcie_xclk);
655 tegra_periph_reset_assert(tegra_pcie.afi_clk);
656 tegra_periph_reset_assert(tegra_pcie.pex_clk);
658 tegra_powergate_power_off(TEGRA_POWERGATE_PCIE);
659 tegra_pcie_xclk_clamp(true);
662 static int tegra_pcie_power_regate(void)
666 tegra_pcie_power_off();
668 tegra_pcie_xclk_clamp(true);
670 tegra_periph_reset_assert(tegra_pcie.pcie_xclk);
671 tegra_periph_reset_assert(tegra_pcie.afi_clk);
673 err = tegra_powergate_sequence_power_up(TEGRA_POWERGATE_PCIE,
676 pr_err("PCIE: powerup sequence failed: %d\n", err);
680 tegra_periph_reset_deassert(tegra_pcie.afi_clk);
682 tegra_pcie_xclk_clamp(false);
684 clk_prepare_enable(tegra_pcie.afi_clk);
685 clk_prepare_enable(tegra_pcie.pex_clk);
686 return clk_prepare_enable(tegra_pcie.pll_e);
689 static int tegra_pcie_clocks_get(void)
693 tegra_pcie.pex_clk = clk_get(NULL, "pex");
694 if (IS_ERR(tegra_pcie.pex_clk))
695 return PTR_ERR(tegra_pcie.pex_clk);
697 tegra_pcie.afi_clk = clk_get(NULL, "afi");
698 if (IS_ERR(tegra_pcie.afi_clk)) {
699 err = PTR_ERR(tegra_pcie.afi_clk);
703 tegra_pcie.pcie_xclk = clk_get(NULL, "pcie_xclk");
704 if (IS_ERR(tegra_pcie.pcie_xclk)) {
705 err = PTR_ERR(tegra_pcie.pcie_xclk);
709 tegra_pcie.pll_e = clk_get_sys(NULL, "pll_e");
710 if (IS_ERR(tegra_pcie.pll_e)) {
711 err = PTR_ERR(tegra_pcie.pll_e);
718 clk_put(tegra_pcie.pcie_xclk);
720 clk_put(tegra_pcie.afi_clk);
722 clk_put(tegra_pcie.pex_clk);
727 static void tegra_pcie_clocks_put(void)
729 clk_put(tegra_pcie.pll_e);
730 clk_put(tegra_pcie.pcie_xclk);
731 clk_put(tegra_pcie.afi_clk);
732 clk_put(tegra_pcie.pex_clk);
735 static int __init tegra_pcie_get_resources(void)
739 err = tegra_pcie_clocks_get();
741 pr_err("PCIE: failed to get clocks: %d\n", err);
745 err = tegra_pcie_power_regate();
747 pr_err("PCIE: failed to power up: %d\n", err);
751 tegra_pcie.regs = ioremap_nocache(TEGRA_PCIE_BASE, PCIE_IOMAP_SZ);
752 if (tegra_pcie.regs == NULL) {
753 pr_err("PCIE: Failed to map PCI/AFI registers\n");
758 err = request_irq(INT_PCIE_INTR, tegra_pcie_isr,
759 IRQF_SHARED, "PCIE", &tegra_pcie);
761 pr_err("PCIE: Failed to register IRQ: %d\n", err);
764 set_irq_flags(INT_PCIE_INTR, IRQF_VALID);
769 iounmap(tegra_pcie.regs);
771 tegra_pcie_power_off();
773 tegra_pcie_clocks_put();
779 * FIXME: If there are no PCIe cards attached, then calling this function
780 * can result in the increase of the bootup time as there are big timeout
783 #define TEGRA_PCIE_LINKUP_TIMEOUT 200 /* up to 1.2 seconds */
784 static bool tegra_pcie_check_link(struct tegra_pcie_port *pp, int idx,
792 timeout = TEGRA_PCIE_LINKUP_TIMEOUT;
794 reg = readl(pp->base + RP_VEND_XP);
796 if (reg & RP_VEND_XP_DL_UP)
804 pr_err("PCIE: port %d: link down, retrying\n", idx);
808 timeout = TEGRA_PCIE_LINKUP_TIMEOUT;
810 reg = readl(pp->base + RP_LINK_CONTROL_STATUS);
812 if (reg & 0x20000000)
820 /* Pulse the PEX reset */
821 reg = afi_readl(reset_reg) | AFI_PEX_CTRL_RST;
822 afi_writel(reg, reset_reg);
824 reg = afi_readl(reset_reg) & ~AFI_PEX_CTRL_RST;
825 afi_writel(reg, reset_reg);
833 static void __init tegra_pcie_add_port(int index, u32 offset, u32 reset_reg)
835 struct tegra_pcie_port *pp;
837 pp = tegra_pcie.port + tegra_pcie.num_ports;
840 pp->base = tegra_pcie.regs + offset;
841 pp->link_up = tegra_pcie_check_link(pp, index, reset_reg);
845 printk(KERN_INFO "PCIE: port %d: link down, ignoring\n", index);
849 tegra_pcie.num_ports++;
851 pp->root_bus_nr = -1;
852 memset(pp->res, 0, sizeof(pp->res));
855 int __init tegra_pcie_init(bool init_port0, bool init_port1)
859 if (!(init_port0 || init_port1))
864 err = tegra_pcie_get_resources();
868 err = tegra_pcie_enable_controller();
872 /* setup the AFI address translations */
873 tegra_pcie_setup_translations();
876 tegra_pcie_add_port(0, RP0_OFFSET, AFI_PEX0_CTRL);
879 tegra_pcie_add_port(1, RP1_OFFSET, AFI_PEX1_CTRL);
881 pci_common_init(&tegra_pcie_hw);