2 * Copyright (c) 2010, CompuLab, Ltd.
3 * Author: Mike Rapoport <mike@compulab.co.il>
5 * Based on NVIDIA PCIe driver
6 * Copyright (c) 2008-2009, NVIDIA Corporation.
8 * Copyright (c) 2013-2014, NVIDIA Corporation.
10 * SPDX-License-Identifier: GPL-2.0
14 #define pr_fmt(fmt) "tegra-pcie: " fmt
25 #include <asm/arch/clock.h>
26 #include <asm/arch/powergate.h>
27 #include <asm/arch-tegra/xusb-padctl.h>
29 #include <linux/list.h>
31 #include <dt-bindings/pinctrl/pinctrl-tegra-xusb.h>
33 DECLARE_GLOBAL_DATA_PTR;
35 #define AFI_AXI_BAR0_SZ 0x00
36 #define AFI_AXI_BAR1_SZ 0x04
37 #define AFI_AXI_BAR2_SZ 0x08
38 #define AFI_AXI_BAR3_SZ 0x0c
39 #define AFI_AXI_BAR4_SZ 0x10
40 #define AFI_AXI_BAR5_SZ 0x14
42 #define AFI_AXI_BAR0_START 0x18
43 #define AFI_AXI_BAR1_START 0x1c
44 #define AFI_AXI_BAR2_START 0x20
45 #define AFI_AXI_BAR3_START 0x24
46 #define AFI_AXI_BAR4_START 0x28
47 #define AFI_AXI_BAR5_START 0x2c
49 #define AFI_FPCI_BAR0 0x30
50 #define AFI_FPCI_BAR1 0x34
51 #define AFI_FPCI_BAR2 0x38
52 #define AFI_FPCI_BAR3 0x3c
53 #define AFI_FPCI_BAR4 0x40
54 #define AFI_FPCI_BAR5 0x44
56 #define AFI_CACHE_BAR0_SZ 0x48
57 #define AFI_CACHE_BAR0_ST 0x4c
58 #define AFI_CACHE_BAR1_SZ 0x50
59 #define AFI_CACHE_BAR1_ST 0x54
61 #define AFI_MSI_BAR_SZ 0x60
62 #define AFI_MSI_FPCI_BAR_ST 0x64
63 #define AFI_MSI_AXI_BAR_ST 0x68
65 #define AFI_CONFIGURATION 0xac
66 #define AFI_CONFIGURATION_EN_FPCI (1 << 0)
68 #define AFI_FPCI_ERROR_MASKS 0xb0
70 #define AFI_INTR_MASK 0xb4
71 #define AFI_INTR_MASK_INT_MASK (1 << 0)
72 #define AFI_INTR_MASK_MSI_MASK (1 << 8)
74 #define AFI_SM_INTR_ENABLE 0xc4
75 #define AFI_SM_INTR_INTA_ASSERT (1 << 0)
76 #define AFI_SM_INTR_INTB_ASSERT (1 << 1)
77 #define AFI_SM_INTR_INTC_ASSERT (1 << 2)
78 #define AFI_SM_INTR_INTD_ASSERT (1 << 3)
79 #define AFI_SM_INTR_INTA_DEASSERT (1 << 4)
80 #define AFI_SM_INTR_INTB_DEASSERT (1 << 5)
81 #define AFI_SM_INTR_INTC_DEASSERT (1 << 6)
82 #define AFI_SM_INTR_INTD_DEASSERT (1 << 7)
84 #define AFI_AFI_INTR_ENABLE 0xc8
85 #define AFI_INTR_EN_INI_SLVERR (1 << 0)
86 #define AFI_INTR_EN_INI_DECERR (1 << 1)
87 #define AFI_INTR_EN_TGT_SLVERR (1 << 2)
88 #define AFI_INTR_EN_TGT_DECERR (1 << 3)
89 #define AFI_INTR_EN_TGT_WRERR (1 << 4)
90 #define AFI_INTR_EN_DFPCI_DECERR (1 << 5)
91 #define AFI_INTR_EN_AXI_DECERR (1 << 6)
92 #define AFI_INTR_EN_FPCI_TIMEOUT (1 << 7)
93 #define AFI_INTR_EN_PRSNT_SENSE (1 << 8)
95 #define AFI_PCIE_CONFIG 0x0f8
96 #define AFI_PCIE_CONFIG_PCIE_DISABLE(x) (1 << ((x) + 1))
97 #define AFI_PCIE_CONFIG_PCIE_DISABLE_ALL 0xe
98 #define AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_MASK (0xf << 20)
99 #define AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_SINGLE (0x0 << 20)
100 #define AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_420 (0x0 << 20)
101 #define AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_X2_X1 (0x0 << 20)
102 #define AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_DUAL (0x1 << 20)
103 #define AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_222 (0x1 << 20)
104 #define AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_X4_X1 (0x1 << 20)
105 #define AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_411 (0x2 << 20)
107 #define AFI_FUSE 0x104
108 #define AFI_FUSE_PCIE_T0_GEN2_DIS (1 << 2)
110 #define AFI_PEX0_CTRL 0x110
111 #define AFI_PEX1_CTRL 0x118
112 #define AFI_PEX2_CTRL 0x128
113 #define AFI_PEX_CTRL_RST (1 << 0)
114 #define AFI_PEX_CTRL_CLKREQ_EN (1 << 1)
115 #define AFI_PEX_CTRL_REFCLK_EN (1 << 3)
116 #define AFI_PEX_CTRL_OVERRIDE_EN (1 << 4)
118 #define AFI_PLLE_CONTROL 0x160
119 #define AFI_PLLE_CONTROL_BYPASS_PADS2PLLE_CONTROL (1 << 9)
120 #define AFI_PLLE_CONTROL_PADS2PLLE_CONTROL_EN (1 << 1)
122 #define AFI_PEXBIAS_CTRL_0 0x168
124 #define PADS_CTL_SEL 0x0000009C
126 #define PADS_CTL 0x000000A0
127 #define PADS_CTL_IDDQ_1L (1 << 0)
128 #define PADS_CTL_TX_DATA_EN_1L (1 << 6)
129 #define PADS_CTL_RX_DATA_EN_1L (1 << 10)
131 #define PADS_PLL_CTL_TEGRA20 0x000000B8
132 #define PADS_PLL_CTL_TEGRA30 0x000000B4
133 #define PADS_PLL_CTL_RST_B4SM (0x1 << 1)
134 #define PADS_PLL_CTL_LOCKDET (0x1 << 8)
135 #define PADS_PLL_CTL_REFCLK_MASK (0x3 << 16)
136 #define PADS_PLL_CTL_REFCLK_INTERNAL_CML (0x0 << 16)
137 #define PADS_PLL_CTL_REFCLK_INTERNAL_CMOS (0x1 << 16)
138 #define PADS_PLL_CTL_REFCLK_EXTERNAL (0x2 << 16)
139 #define PADS_PLL_CTL_TXCLKREF_MASK (0x1 << 20)
140 #define PADS_PLL_CTL_TXCLKREF_DIV10 (0x0 << 20)
141 #define PADS_PLL_CTL_TXCLKREF_DIV5 (0x1 << 20)
142 #define PADS_PLL_CTL_TXCLKREF_BUF_EN (0x1 << 22)
144 #define PADS_REFCLK_CFG0 0x000000C8
145 #define PADS_REFCLK_CFG1 0x000000CC
148 * Fields in PADS_REFCLK_CFG*. Those registers form an array of 16-bit
149 * entries, one entry per PCIe port. These field definitions and desired
150 * values aren't in the TRM, but do come from NVIDIA.
152 #define PADS_REFCLK_CFG_TERM_SHIFT 2 /* 6:2 */
153 #define PADS_REFCLK_CFG_E_TERM_SHIFT 7
154 #define PADS_REFCLK_CFG_PREDI_SHIFT 8 /* 11:8 */
155 #define PADS_REFCLK_CFG_DRVI_SHIFT 12 /* 15:12 */
157 /* Default value provided by HW engineering is 0xfa5c */
158 #define PADS_REFCLK_CFG_VALUE \
160 (0x17 << PADS_REFCLK_CFG_TERM_SHIFT) | \
161 (0 << PADS_REFCLK_CFG_E_TERM_SHIFT) | \
162 (0xa << PADS_REFCLK_CFG_PREDI_SHIFT) | \
163 (0xf << PADS_REFCLK_CFG_DRVI_SHIFT) \
166 #define RP_VEND_XP 0x00000F00
167 #define RP_VEND_XP_DL_UP (1 << 30)
169 #define RP_PRIV_MISC 0x00000FE0
170 #define RP_PRIV_MISC_PRSNT_MAP_EP_PRSNT (0xE << 0)
171 #define RP_PRIV_MISC_PRSNT_MAP_EP_ABSNT (0xF << 0)
173 #define RP_LINK_CONTROL_STATUS 0x00000090
174 #define RP_LINK_CONTROL_STATUS_DL_LINK_ACTIVE 0x20000000
175 #define RP_LINK_CONTROL_STATUS_LINKSTAT_MASK 0x3fff0000
179 struct tegra_pcie_port {
180 struct tegra_pcie *pcie;
182 struct fdt_resource regs;
183 unsigned int num_lanes;
186 struct list_head list;
189 struct tegra_pcie_soc {
190 unsigned int num_ports;
191 unsigned long pads_pll_ctl;
192 unsigned long tx_ref_sel;
193 bool has_pex_clkreq_en;
194 bool has_pex_bias_ctrl;
200 struct pci_controller hose;
202 struct fdt_resource pads;
203 struct fdt_resource afi;
204 struct fdt_resource cs;
206 struct fdt_resource prefetch;
207 struct fdt_resource mem;
208 struct fdt_resource io;
210 struct list_head ports;
213 const struct tegra_pcie_soc *soc;
214 struct tegra_xusb_phy *phy;
217 static inline struct tegra_pcie *to_tegra_pcie(struct pci_controller *hose)
219 return container_of(hose, struct tegra_pcie, hose);
222 static void afi_writel(struct tegra_pcie *pcie, unsigned long value,
223 unsigned long offset)
225 writel(value, pcie->afi.start + offset);
228 static unsigned long afi_readl(struct tegra_pcie *pcie, unsigned long offset)
230 return readl(pcie->afi.start + offset);
233 static void pads_writel(struct tegra_pcie *pcie, unsigned long value,
234 unsigned long offset)
236 writel(value, pcie->pads.start + offset);
239 static unsigned long pads_readl(struct tegra_pcie *pcie, unsigned long offset)
241 return readl(pcie->pads.start + offset);
244 static unsigned long rp_readl(struct tegra_pcie_port *port,
245 unsigned long offset)
247 return readl(port->regs.start + offset);
250 static void rp_writel(struct tegra_pcie_port *port, unsigned long value,
251 unsigned long offset)
253 writel(value, port->regs.start + offset);
256 static unsigned long tegra_pcie_conf_offset(pci_dev_t bdf, int where)
258 return ((where & 0xf00) << 16) | (PCI_BUS(bdf) << 16) |
259 (PCI_DEV(bdf) << 11) | (PCI_FUNC(bdf) << 8) |
263 static int tegra_pcie_conf_address(struct tegra_pcie *pcie, pci_dev_t bdf,
264 int where, unsigned long *address)
266 unsigned int bus = PCI_BUS(bdf);
269 unsigned int dev = PCI_DEV(bdf);
270 struct tegra_pcie_port *port;
272 list_for_each_entry(port, &pcie->ports, list) {
273 if (port->index + 1 == dev) {
274 *address = port->regs.start + (where & ~3);
279 *address = pcie->cs.start + tegra_pcie_conf_offset(bdf, where);
286 static int tegra_pcie_read_conf(struct pci_controller *hose, pci_dev_t bdf,
287 int where, u32 *value)
289 struct tegra_pcie *pcie = to_tegra_pcie(hose);
290 unsigned long address;
293 err = tegra_pcie_conf_address(pcie, bdf, where, &address);
299 *value = readl(address);
301 /* fixup root port class */
302 if (PCI_BUS(bdf) == 0) {
303 if (where == PCI_CLASS_REVISION) {
304 *value &= ~0x00ff0000;
305 *value |= PCI_CLASS_BRIDGE_PCI << 16;
312 static int tegra_pcie_write_conf(struct pci_controller *hose, pci_dev_t bdf,
313 int where, u32 value)
315 struct tegra_pcie *pcie = to_tegra_pcie(hose);
316 unsigned long address;
319 err = tegra_pcie_conf_address(pcie, bdf, where, &address);
323 writel(value, address);
328 static int tegra_pcie_port_parse_dt(const void *fdt, int node,
329 struct tegra_pcie_port *port)
334 addr = fdt_getprop(fdt, node, "assigned-addresses", &len);
336 error("property \"assigned-addresses\" not found");
337 return -FDT_ERR_NOTFOUND;
340 port->regs.start = fdt32_to_cpu(addr[2]);
341 port->regs.end = port->regs.start + fdt32_to_cpu(addr[4]);
346 static int tegra_pcie_get_xbar_config(const void *fdt, int node, u32 lanes,
349 enum fdt_compat_id id = fdtdec_lookup(fdt, node);
352 case COMPAT_NVIDIA_TEGRA20_PCIE:
355 debug("single-mode configuration\n");
356 *xbar = AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_SINGLE;
360 debug("dual-mode configuration\n");
361 *xbar = AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_DUAL;
366 case COMPAT_NVIDIA_TEGRA30_PCIE:
369 debug("4x1, 2x1 configuration\n");
370 *xbar = AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_420;
374 debug("2x3 configuration\n");
375 *xbar = AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_222;
379 debug("4x1, 1x2 configuration\n");
380 *xbar = AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_411;
385 case COMPAT_NVIDIA_TEGRA124_PCIE:
388 debug("4x1, 1x1 configuration\n");
389 *xbar = AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_X4_X1;
393 debug("2x1, 1x1 configuration\n");
394 *xbar = AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_X2_X1;
403 return -FDT_ERR_NOTFOUND;
406 static int tegra_pcie_parse_dt_ranges(const void *fdt, int node,
407 struct tegra_pcie *pcie)
409 int parent, na_parent, na_pcie, ns_pcie;
410 const u32 *ptr, *end;
413 parent = fdt_parent_offset(fdt, node);
415 error("Can't find PCI parent node\n");
416 return -FDT_ERR_NOTFOUND;
419 na_parent = fdt_address_cells(fdt, parent);
421 error("bad #address-cells for PCIE parent\n");
422 return -FDT_ERR_NOTFOUND;
425 na_pcie = fdt_address_cells(fdt, node);
427 error("bad #address-cells for PCIE\n");
428 return -FDT_ERR_NOTFOUND;
431 ns_pcie = fdt_size_cells(fdt, node);
433 error("bad #size-cells for PCIE\n");
434 return -FDT_ERR_NOTFOUND;
437 ptr = fdt_getprop(fdt, node, "ranges", &len);
439 error("missing \"ranges\" property");
440 return -FDT_ERR_NOTFOUND;
446 struct fdt_resource *res = NULL;
447 u32 space = fdt32_to_cpu(*ptr);
449 switch ((space >> 24) & 0x3) {
454 case 0x02: /* 32 bit */
455 case 0x03: /* 64 bit */
456 if (space & (1 << 30))
457 res = &pcie->prefetch;
465 int start_low = na_pcie + (na_parent - 1);
466 int size_low = na_pcie + na_parent + (ns_pcie - 1);
467 res->start = fdt32_to_cpu(ptr[start_low]);
468 res->end = res->start + fdt32_to_cpu(ptr[size_low]);
471 ptr += na_pcie + na_parent + ns_pcie;
474 debug("PCI regions:\n");
475 debug(" I/O: %pa-%pa\n", &pcie->io.start, &pcie->io.end);
476 debug(" non-prefetchable memory: %pa-%pa\n", &pcie->mem.start,
478 debug(" prefetchable memory: %pa-%pa\n", &pcie->prefetch.start,
479 &pcie->prefetch.end);
484 static int tegra_pcie_parse_port_info(const void *fdt, int node,
488 struct fdt_pci_addr addr;
491 err = fdtdec_get_int(fdt, node, "nvidia,num-lanes", 0);
493 error("failed to parse \"nvidia,num-lanes\" property");
499 err = fdtdec_get_pci_addr(fdt, node, 0, "reg", &addr);
501 error("failed to parse \"reg\" property");
505 *index = PCI_DEV(addr.phys_hi) - 1;
510 static int tegra_pcie_parse_dt(const void *fdt, int node,
511 struct tegra_pcie *pcie)
516 err = fdt_get_named_resource(fdt, node, "reg", "reg-names", "pads",
519 error("resource \"pads\" not found");
523 err = fdt_get_named_resource(fdt, node, "reg", "reg-names", "afi",
526 error("resource \"afi\" not found");
530 err = fdt_get_named_resource(fdt, node, "reg", "reg-names", "cs",
533 error("resource \"cs\" not found");
537 pcie->phy = tegra_xusb_phy_get(TEGRA_XUSB_PADCTL_PCIE);
539 err = tegra_xusb_phy_prepare(pcie->phy);
541 error("failed to prepare PHY: %d", err);
546 err = tegra_pcie_parse_dt_ranges(fdt, node, pcie);
548 error("failed to parse \"ranges\" property");
552 fdt_for_each_subnode(fdt, subnode, node) {
553 unsigned int index = 0, num_lanes = 0;
554 struct tegra_pcie_port *port;
556 err = tegra_pcie_parse_port_info(fdt, subnode, &index,
559 error("failed to obtain root port info");
563 lanes |= num_lanes << (index << 3);
565 if (!fdtdec_get_is_enabled(fdt, subnode))
568 port = malloc(sizeof(*port));
572 memset(port, 0, sizeof(*port));
573 port->num_lanes = num_lanes;
576 err = tegra_pcie_port_parse_dt(fdt, subnode, port);
582 list_add_tail(&port->list, &pcie->ports);
586 err = tegra_pcie_get_xbar_config(fdt, node, lanes, &pcie->xbar);
588 error("invalid lane configuration");
595 int __weak tegra_pcie_board_init(void)
600 static int tegra_pcie_power_on(struct tegra_pcie *pcie)
602 const struct tegra_pcie_soc *soc = pcie->soc;
606 /* reset PCIEXCLK logic, AFI controller and PCIe controller */
607 reset_set_enable(PERIPH_ID_PCIEXCLK, 1);
608 reset_set_enable(PERIPH_ID_AFI, 1);
609 reset_set_enable(PERIPH_ID_PCIE, 1);
611 err = tegra_powergate_power_off(TEGRA_POWERGATE_PCIE);
613 error("failed to power off PCIe partition: %d", err);
617 tegra_pcie_board_init();
619 err = tegra_powergate_sequence_power_up(TEGRA_POWERGATE_PCIE,
622 error("failed to power up PCIe partition: %d", err);
626 /* take AFI controller out of reset */
627 reset_set_enable(PERIPH_ID_AFI, 0);
629 /* enable AFI clock */
630 clock_enable(PERIPH_ID_AFI);
632 if (soc->has_cml_clk) {
633 /* enable CML clock */
634 value = readl(NV_PA_CLK_RST_BASE + 0x48c);
637 writel(value, NV_PA_CLK_RST_BASE + 0x48c);
640 err = tegra_plle_enable();
642 error("failed to enable PLLE: %d\n", err);
649 static int tegra_pcie_pll_wait(struct tegra_pcie *pcie, unsigned long timeout)
651 const struct tegra_pcie_soc *soc = pcie->soc;
652 unsigned long start = get_timer(0);
655 while (get_timer(start) < timeout) {
656 value = pads_readl(pcie, soc->pads_pll_ctl);
657 if (value & PADS_PLL_CTL_LOCKDET)
664 static int tegra_pcie_phy_enable(struct tegra_pcie *pcie)
666 const struct tegra_pcie_soc *soc = pcie->soc;
670 /* initialize internal PHY, enable up to 16 PCIe lanes */
671 pads_writel(pcie, 0, PADS_CTL_SEL);
673 /* override IDDQ to 1 on all 4 lanes */
674 value = pads_readl(pcie, PADS_CTL);
675 value |= PADS_CTL_IDDQ_1L;
676 pads_writel(pcie, value, PADS_CTL);
679 * Set up PHY PLL inputs select PLLE output as refclock, set TX
680 * ref sel to div10 (not div5).
682 value = pads_readl(pcie, soc->pads_pll_ctl);
683 value &= ~(PADS_PLL_CTL_REFCLK_MASK | PADS_PLL_CTL_TXCLKREF_MASK);
684 value |= PADS_PLL_CTL_REFCLK_INTERNAL_CML | soc->tx_ref_sel;
685 pads_writel(pcie, value, soc->pads_pll_ctl);
688 value = pads_readl(pcie, soc->pads_pll_ctl);
689 value &= ~PADS_PLL_CTL_RST_B4SM;
690 pads_writel(pcie, value, soc->pads_pll_ctl);
694 /* take PLL out of reset */
695 value = pads_readl(pcie, soc->pads_pll_ctl);
696 value |= PADS_PLL_CTL_RST_B4SM;
697 pads_writel(pcie, value, soc->pads_pll_ctl);
699 /* configure the reference clock driver */
700 value = PADS_REFCLK_CFG_VALUE | (PADS_REFCLK_CFG_VALUE << 16);
701 pads_writel(pcie, value, PADS_REFCLK_CFG0);
703 if (soc->num_ports > 2)
704 pads_writel(pcie, PADS_REFCLK_CFG_VALUE, PADS_REFCLK_CFG1);
706 /* wait for the PLL to lock */
707 err = tegra_pcie_pll_wait(pcie, 500);
709 error("PLL failed to lock: %d", err);
713 /* turn off IDDQ override */
714 value = pads_readl(pcie, PADS_CTL);
715 value &= ~PADS_CTL_IDDQ_1L;
716 pads_writel(pcie, value, PADS_CTL);
718 /* enable TX/RX data */
719 value = pads_readl(pcie, PADS_CTL);
720 value |= PADS_CTL_TX_DATA_EN_1L | PADS_CTL_RX_DATA_EN_1L;
721 pads_writel(pcie, value, PADS_CTL);
726 static int tegra_pcie_enable_controller(struct tegra_pcie *pcie)
728 const struct tegra_pcie_soc *soc = pcie->soc;
729 struct tegra_pcie_port *port;
734 value = afi_readl(pcie, AFI_PLLE_CONTROL);
735 value &= ~AFI_PLLE_CONTROL_BYPASS_PADS2PLLE_CONTROL;
736 value |= AFI_PLLE_CONTROL_PADS2PLLE_CONTROL_EN;
737 afi_writel(pcie, value, AFI_PLLE_CONTROL);
740 if (soc->has_pex_bias_ctrl)
741 afi_writel(pcie, 0, AFI_PEXBIAS_CTRL_0);
743 value = afi_readl(pcie, AFI_PCIE_CONFIG);
744 value &= ~AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_MASK;
745 value |= AFI_PCIE_CONFIG_PCIE_DISABLE_ALL | pcie->xbar;
747 list_for_each_entry(port, &pcie->ports, list)
748 value &= ~AFI_PCIE_CONFIG_PCIE_DISABLE(port->index);
750 afi_writel(pcie, value, AFI_PCIE_CONFIG);
752 value = afi_readl(pcie, AFI_FUSE);
755 value &= ~AFI_FUSE_PCIE_T0_GEN2_DIS;
757 value |= AFI_FUSE_PCIE_T0_GEN2_DIS;
759 afi_writel(pcie, value, AFI_FUSE);
762 err = tegra_xusb_phy_enable(pcie->phy);
764 err = tegra_pcie_phy_enable(pcie);
767 error("failed to power on PHY: %d\n", err);
771 /* take the PCIEXCLK logic out of reset */
772 reset_set_enable(PERIPH_ID_PCIEXCLK, 0);
774 /* finally enable PCIe */
775 value = afi_readl(pcie, AFI_CONFIGURATION);
776 value |= AFI_CONFIGURATION_EN_FPCI;
777 afi_writel(pcie, value, AFI_CONFIGURATION);
779 /* disable all interrupts */
780 afi_writel(pcie, 0, AFI_AFI_INTR_ENABLE);
781 afi_writel(pcie, 0, AFI_SM_INTR_ENABLE);
782 afi_writel(pcie, 0, AFI_INTR_MASK);
783 afi_writel(pcie, 0, AFI_FPCI_ERROR_MASKS);
788 static void tegra_pcie_setup_translations(struct tegra_pcie *pcie)
790 unsigned long fpci, axi, size;
792 /* BAR 0: type 1 extended configuration space */
794 size = fdt_resource_size(&pcie->cs);
795 axi = pcie->cs.start;
797 afi_writel(pcie, axi, AFI_AXI_BAR0_START);
798 afi_writel(pcie, size >> 12, AFI_AXI_BAR0_SZ);
799 afi_writel(pcie, fpci, AFI_FPCI_BAR0);
801 /* BAR 1: downstream I/O */
803 size = fdt_resource_size(&pcie->io);
804 axi = pcie->io.start;
806 afi_writel(pcie, axi, AFI_AXI_BAR1_START);
807 afi_writel(pcie, size >> 12, AFI_AXI_BAR1_SZ);
808 afi_writel(pcie, fpci, AFI_FPCI_BAR1);
810 /* BAR 2: prefetchable memory */
811 fpci = (((pcie->prefetch.start >> 12) & 0x0fffffff) << 4) | 0x1;
812 size = fdt_resource_size(&pcie->prefetch);
813 axi = pcie->prefetch.start;
815 afi_writel(pcie, axi, AFI_AXI_BAR2_START);
816 afi_writel(pcie, size >> 12, AFI_AXI_BAR2_SZ);
817 afi_writel(pcie, fpci, AFI_FPCI_BAR2);
819 /* BAR 3: non-prefetchable memory */
820 fpci = (((pcie->mem.start >> 12) & 0x0fffffff) << 4) | 0x1;
821 size = fdt_resource_size(&pcie->mem);
822 axi = pcie->mem.start;
824 afi_writel(pcie, axi, AFI_AXI_BAR3_START);
825 afi_writel(pcie, size >> 12, AFI_AXI_BAR3_SZ);
826 afi_writel(pcie, fpci, AFI_FPCI_BAR3);
828 /* NULL out the remaining BARs as they are not used */
829 afi_writel(pcie, 0, AFI_AXI_BAR4_START);
830 afi_writel(pcie, 0, AFI_AXI_BAR4_SZ);
831 afi_writel(pcie, 0, AFI_FPCI_BAR4);
833 afi_writel(pcie, 0, AFI_AXI_BAR5_START);
834 afi_writel(pcie, 0, AFI_AXI_BAR5_SZ);
835 afi_writel(pcie, 0, AFI_FPCI_BAR5);
837 /* map all upstream transactions as uncached */
838 afi_writel(pcie, NV_PA_SDRAM_BASE, AFI_CACHE_BAR0_ST);
839 afi_writel(pcie, 0, AFI_CACHE_BAR0_SZ);
840 afi_writel(pcie, 0, AFI_CACHE_BAR1_ST);
841 afi_writel(pcie, 0, AFI_CACHE_BAR1_SZ);
843 /* MSI translations are setup only when needed */
844 afi_writel(pcie, 0, AFI_MSI_FPCI_BAR_ST);
845 afi_writel(pcie, 0, AFI_MSI_BAR_SZ);
846 afi_writel(pcie, 0, AFI_MSI_AXI_BAR_ST);
847 afi_writel(pcie, 0, AFI_MSI_BAR_SZ);
850 static unsigned long tegra_pcie_port_get_pex_ctrl(struct tegra_pcie_port *port)
852 unsigned long ret = 0;
854 switch (port->index) {
871 static void tegra_pcie_port_reset(struct tegra_pcie_port *port)
873 unsigned long ctrl = tegra_pcie_port_get_pex_ctrl(port);
876 /* pulse reset signel */
877 value = afi_readl(port->pcie, ctrl);
878 value &= ~AFI_PEX_CTRL_RST;
879 afi_writel(port->pcie, value, ctrl);
883 value = afi_readl(port->pcie, ctrl);
884 value |= AFI_PEX_CTRL_RST;
885 afi_writel(port->pcie, value, ctrl);
888 static void tegra_pcie_port_enable(struct tegra_pcie_port *port)
890 unsigned long ctrl = tegra_pcie_port_get_pex_ctrl(port);
893 /* enable reference clock */
894 value = afi_readl(port->pcie, ctrl);
895 value |= AFI_PEX_CTRL_REFCLK_EN;
897 if (port->pcie->soc->has_pex_clkreq_en)
898 value |= AFI_PEX_CTRL_CLKREQ_EN;
900 value |= AFI_PEX_CTRL_OVERRIDE_EN;
902 afi_writel(port->pcie, value, ctrl);
904 tegra_pcie_port_reset(port);
907 static bool tegra_pcie_port_check_link(struct tegra_pcie_port *port)
909 unsigned int retries = 3;
912 value = rp_readl(port, RP_PRIV_MISC);
913 value &= ~RP_PRIV_MISC_PRSNT_MAP_EP_ABSNT;
914 value |= RP_PRIV_MISC_PRSNT_MAP_EP_PRSNT;
915 rp_writel(port, value, RP_PRIV_MISC);
918 unsigned int timeout = 200;
921 value = rp_readl(port, RP_VEND_XP);
922 if (value & RP_VEND_XP_DL_UP)
929 debug("link %u down, retrying\n", port->index);
936 value = rp_readl(port, RP_LINK_CONTROL_STATUS);
937 if (value & RP_LINK_CONTROL_STATUS_DL_LINK_ACTIVE)
944 tegra_pcie_port_reset(port);
950 static void tegra_pcie_port_disable(struct tegra_pcie_port *port)
952 unsigned long ctrl = tegra_pcie_port_get_pex_ctrl(port);
955 /* assert port reset */
956 value = afi_readl(port->pcie, ctrl);
957 value &= ~AFI_PEX_CTRL_RST;
958 afi_writel(port->pcie, value, ctrl);
960 /* disable reference clock */
961 value = afi_readl(port->pcie, ctrl);
962 value &= ~AFI_PEX_CTRL_REFCLK_EN;
963 afi_writel(port->pcie, value, ctrl);
966 static void tegra_pcie_port_free(struct tegra_pcie_port *port)
968 list_del(&port->list);
972 static int tegra_pcie_enable(struct tegra_pcie *pcie)
974 struct tegra_pcie_port *port, *tmp;
976 list_for_each_entry_safe(port, tmp, &pcie->ports, list) {
977 debug("probing port %u, using %u lanes\n", port->index,
980 tegra_pcie_port_enable(port);
982 if (tegra_pcie_port_check_link(port))
985 debug("link %u down, ignoring\n", port->index);
987 tegra_pcie_port_disable(port);
988 tegra_pcie_port_free(port);
994 static const struct tegra_pcie_soc tegra20_pcie_soc = {
996 .pads_pll_ctl = PADS_PLL_CTL_TEGRA20,
997 .tx_ref_sel = PADS_PLL_CTL_TXCLKREF_DIV10,
998 .has_pex_clkreq_en = false,
999 .has_pex_bias_ctrl = false,
1000 .has_cml_clk = false,
1004 static const struct tegra_pcie_soc tegra30_pcie_soc = {
1006 .pads_pll_ctl = PADS_PLL_CTL_TEGRA30,
1007 .tx_ref_sel = PADS_PLL_CTL_TXCLKREF_BUF_EN,
1008 .has_pex_clkreq_en = true,
1009 .has_pex_bias_ctrl = true,
1010 .has_cml_clk = true,
1014 static const struct tegra_pcie_soc tegra124_pcie_soc = {
1016 .pads_pll_ctl = PADS_PLL_CTL_TEGRA30,
1017 .tx_ref_sel = PADS_PLL_CTL_TXCLKREF_BUF_EN,
1018 .has_pex_clkreq_en = true,
1019 .has_pex_bias_ctrl = true,
1020 .has_cml_clk = true,
1024 static int process_nodes(const void *fdt, int nodes[], unsigned int count)
1028 uint32_t pci_dram_size;
1030 /* Clip PCI-accessible DRAM to 32-bits */
1031 dram_end = ((uint64_t)NV_PA_SDRAM_BASE) + gd->ram_size;
1032 if (dram_end > 0x100000000)
1033 dram_end = 0x100000000;
1034 pci_dram_size = dram_end - NV_PA_SDRAM_BASE;
1036 for (i = 0; i < count; i++) {
1037 const struct tegra_pcie_soc *soc;
1038 struct tegra_pcie *pcie;
1039 enum fdt_compat_id id;
1042 if (!fdtdec_get_is_enabled(fdt, nodes[i]))
1045 id = fdtdec_lookup(fdt, nodes[i]);
1047 case COMPAT_NVIDIA_TEGRA20_PCIE:
1048 soc = &tegra20_pcie_soc;
1051 case COMPAT_NVIDIA_TEGRA30_PCIE:
1052 soc = &tegra30_pcie_soc;
1055 case COMPAT_NVIDIA_TEGRA124_PCIE:
1056 soc = &tegra124_pcie_soc;
1060 error("unsupported compatible: %s",
1061 fdtdec_get_compatible(id));
1065 pcie = malloc(sizeof(*pcie));
1067 error("failed to allocate controller");
1071 memset(pcie, 0, sizeof(*pcie));
1074 INIT_LIST_HEAD(&pcie->ports);
1076 err = tegra_pcie_parse_dt(fdt, nodes[i], pcie);
1082 err = tegra_pcie_power_on(pcie);
1084 error("failed to power on");
1088 err = tegra_pcie_enable_controller(pcie);
1090 error("failed to enable controller");
1094 tegra_pcie_setup_translations(pcie);
1096 err = tegra_pcie_enable(pcie);
1098 error("failed to enable PCIe");
1102 pcie->hose.first_busno = 0;
1103 pcie->hose.current_busno = 0;
1104 pcie->hose.last_busno = 0;
1106 pci_set_region(&pcie->hose.regions[0], NV_PA_SDRAM_BASE,
1107 NV_PA_SDRAM_BASE, pci_dram_size,
1108 PCI_REGION_MEM | PCI_REGION_SYS_MEMORY);
1110 pci_set_region(&pcie->hose.regions[1], pcie->io.start,
1111 pcie->io.start, fdt_resource_size(&pcie->io),
1114 pci_set_region(&pcie->hose.regions[2], pcie->mem.start,
1115 pcie->mem.start, fdt_resource_size(&pcie->mem),
1118 pci_set_region(&pcie->hose.regions[3], pcie->prefetch.start,
1119 pcie->prefetch.start,
1120 fdt_resource_size(&pcie->prefetch),
1121 PCI_REGION_MEM | PCI_REGION_PREFETCH);
1123 pcie->hose.region_count = 4;
1125 pci_set_ops(&pcie->hose,
1126 pci_hose_read_config_byte_via_dword,
1127 pci_hose_read_config_word_via_dword,
1128 tegra_pcie_read_conf,
1129 pci_hose_write_config_byte_via_dword,
1130 pci_hose_write_config_word_via_dword,
1131 tegra_pcie_write_conf);
1133 pci_register_hose(&pcie->hose);
1135 #ifdef CONFIG_PCI_SCAN_SHOW
1136 printf("PCI: Enumerating devices...\n");
1137 printf("---------------------------------------\n");
1138 printf(" Device ID Description\n");
1139 printf(" ------ -- -----------\n");
1142 pcie->hose.last_busno = pci_hose_scan(&pcie->hose);
1148 void pci_init_board(void)
1150 const void *fdt = gd->fdt_blob;
1151 int count, nodes[1];
1153 count = fdtdec_find_aliases_for_id(fdt, "pcie-controller",
1154 COMPAT_NVIDIA_TEGRA124_PCIE,
1155 nodes, ARRAY_SIZE(nodes));
1156 if (process_nodes(fdt, nodes, count))
1159 count = fdtdec_find_aliases_for_id(fdt, "pcie-controller",
1160 COMPAT_NVIDIA_TEGRA30_PCIE,
1161 nodes, ARRAY_SIZE(nodes));
1162 if (process_nodes(fdt, nodes, count))
1165 count = fdtdec_find_aliases_for_id(fdt, "pcie-controller",
1166 COMPAT_NVIDIA_TEGRA20_PCIE,
1167 nodes, ARRAY_SIZE(nodes));
1168 if (process_nodes(fdt, nodes, count))
1172 int pci_skip_dev(struct pci_controller *hose, pci_dev_t dev)
1174 if (PCI_BUS(dev) != 0 && PCI_DEV(dev) > 0)