1 // SPDX-License-Identifier: GPL-2.0
3 * Renesas RCar Gen3 PCIEC driver
5 * Copyright (C) 2018-2019 Marek Vasut <marek.vasut@gmail.com>
7 * Based on Linux PCIe driver for Renesas R-Car SoCs
8 * Copyright (C) 2014 Renesas Electronics Europe Ltd
11 * arch/sh/drivers/pci/pcie-sh7786.c
12 * arch/sh/drivers/pci/ops-sh7786.c
13 * Copyright (C) 2009 - 2011 Paul Mundt
15 * Author: Phil Edworthy <phil.edworthy@renesas.com>
25 #include <linux/bitops.h>
27 #define PCIECAR 0x000010
28 #define PCIECCTLR 0x000018
29 #define CONFIG_SEND_ENABLE BIT(31)
30 #define TYPE0 (0 << 8)
32 #define PCIECDR 0x000020
33 #define PCIEMSR 0x000028
34 #define PCIEINTXR 0x000400
35 #define PCIEPHYSR 0x0007f0
37 #define PCIEMSITXR 0x000840
39 /* Transfer control */
40 #define PCIETCTLR 0x02000
42 #define PCIETSTR 0x02004
43 #define DATA_LINK_ACTIVE 1
44 #define PCIEERRFR 0x02020
45 #define UNSUPPORTED_REQUEST BIT(4)
46 #define PCIEMSIFR 0x02044
47 #define PCIEMSIALR 0x02048
49 #define PCIEMSIAUR 0x0204c
50 #define PCIEMSIIER 0x02050
52 /* root port address */
53 #define PCIEPRAR(x) (0x02080 + ((x) * 0x4))
55 /* local address reg & mask */
56 #define PCIELAR(x) (0x02200 + ((x) * 0x20))
57 #define PCIELAMR(x) (0x02208 + ((x) * 0x20))
58 #define LAM_PREFETCH BIT(3)
59 #define LAM_64BIT BIT(2)
60 #define LAR_ENABLE BIT(1)
62 /* PCIe address reg & mask */
63 #define PCIEPALR(x) (0x03400 + ((x) * 0x20))
64 #define PCIEPAUR(x) (0x03404 + ((x) * 0x20))
65 #define PCIEPAMR(x) (0x03408 + ((x) * 0x20))
66 #define PCIEPTCTLR(x) (0x0340c + ((x) * 0x20))
67 #define PAR_ENABLE BIT(31)
68 #define IO_SPACE BIT(8)
71 #define PCICONF(x) (0x010000 + ((x) * 0x4))
72 #define PMCAP(x) (0x010040 + ((x) * 0x4))
73 #define EXPCAP(x) (0x010070 + ((x) * 0x4))
74 #define VCCAP(x) (0x010100 + ((x) * 0x4))
77 #define IDSETR1 0x011004
78 #define TLCTLR 0x011048
79 #define MACSR 0x011054
80 #define SPCHGFIN BIT(4)
81 #define SPCHGFAIL BIT(6)
82 #define SPCHGSUC BIT(7)
83 #define LINK_SPEED (0xf << 16)
84 #define LINK_SPEED_2_5GTS (1 << 16)
85 #define LINK_SPEED_5_0GTS (2 << 16)
86 #define MACCTLR 0x011058
87 #define SPEED_CHANGE BIT(24)
88 #define SCRAMBLE_DISABLE BIT(27)
89 #define MACS2R 0x011078
90 #define MACCGSPSETR 0x011084
91 #define SPCNGRSN BIT(31)
94 #define H1_PCIEPHYADRR 0x04000c
95 #define WRITE_CMD BIT(16)
96 #define PHY_ACK BIT(24)
100 #define H1_PCIEPHYDOUTR 0x040014
103 #define GEN2_PCIEPHYADDR 0x780
104 #define GEN2_PCIEPHYDATA 0x784
105 #define GEN2_PCIEPHYCTRL 0x78c
107 #define INT_PCI_MSI_NR 32
109 #define RCONF(x) (PCICONF(0) + (x))
110 #define RPMCAP(x) (PMCAP(0) + (x))
111 #define REXPCAP(x) (EXPCAP(0) + (x))
112 #define RVCCAP(x) (VCCAP(0) + (x))
114 #define PCIE_CONF_BUS(b) (((b) & 0xff) << 24)
115 #define PCIE_CONF_DEV(d) (((d) & 0x1f) << 19)
116 #define PCIE_CONF_FUNC(f) (((f) & 0x7) << 16)
118 #define RCAR_PCI_MAX_RESOURCES 4
119 #define MAX_NR_INBOUND_MAPS 6
121 #define PCI_EXP_FLAGS 2 /* Capabilities register */
122 #define PCI_EXP_FLAGS_TYPE 0x00f0 /* Device/Port type */
123 #define PCI_EXP_TYPE_ROOT_PORT 0x4 /* Root Port */
124 #define PCI_EXP_LNKCAP 12 /* Link Capabilities */
125 #define PCI_EXP_LNKCAP_DLLLARC 0x00100000 /* Data Link Layer Link Active Reporting Capable */
126 #define PCI_EXP_SLTCAP 20 /* Slot Capabilities */
127 #define PCI_EXP_SLTCAP_PSN 0xfff80000 /* Physical Slot Number */
130 RCAR_PCI_ACCESS_READ,
131 RCAR_PCI_ACCESS_WRITE,
134 struct rcar_gen3_pcie_priv {
138 static void rcar_rmw32(struct udevice *dev, int where, u32 mask, u32 data)
140 struct rcar_gen3_pcie_priv *priv = dev_get_platdata(dev);
141 int shift = 8 * (where & 3);
143 clrsetbits_le32(priv->regs + (where & ~3),
144 mask << shift, data << shift);
147 static u32 rcar_read_conf(const struct udevice *dev, int where)
149 struct rcar_gen3_pcie_priv *priv = dev_get_platdata(dev);
150 int shift = 8 * (where & 3);
152 return readl(priv->regs + (where & ~3)) >> shift;
155 static int rcar_pcie_config_access(const struct udevice *udev,
156 unsigned char access_type,
157 pci_dev_t bdf, int where, ulong *data)
159 struct rcar_gen3_pcie_priv *priv = dev_get_platdata(udev);
160 u32 reg = where & ~3;
163 clrbits_le32(priv->regs + PCIEERRFR, 0);
165 /* Set the PIO address */
166 writel((bdf << 8) | reg, priv->regs + PCIECAR);
168 /* Enable the configuration access */
170 writel(CONFIG_SEND_ENABLE | TYPE0, priv->regs + PCIECCTLR);
172 writel(CONFIG_SEND_ENABLE | TYPE1, priv->regs + PCIECCTLR);
174 /* Check for errors */
175 if (readl(priv->regs + PCIEERRFR) & UNSUPPORTED_REQUEST)
178 /* Check for master and target aborts */
179 if (rcar_read_conf(udev, RCONF(PCI_STATUS)) &
180 (PCI_STATUS_REC_MASTER_ABORT | PCI_STATUS_REC_TARGET_ABORT))
183 if (access_type == RCAR_PCI_ACCESS_READ)
184 *data = readl(priv->regs + PCIECDR);
186 writel(*data, priv->regs + PCIECDR);
188 /* Disable the configuration access */
189 writel(0, priv->regs + PCIECCTLR);
194 static int rcar_gen3_pcie_addr_valid(pci_dev_t d, uint where)
208 static int rcar_gen3_pcie_read_config(const struct udevice *dev, pci_dev_t bdf,
209 uint where, ulong *val,
210 enum pci_size_t size)
215 ret = rcar_gen3_pcie_addr_valid(bdf, where);
217 *val = pci_get_ff(size);
221 ret = rcar_pcie_config_access(dev, RCAR_PCI_ACCESS_READ,
226 *val = pci_conv_32_to_size(reg, where, size);
231 static int rcar_gen3_pcie_write_config(struct udevice *dev, pci_dev_t bdf,
232 uint where, ulong val,
233 enum pci_size_t size)
238 ret = rcar_gen3_pcie_addr_valid(bdf, where);
242 data = pci_conv_32_to_size(val, where, size);
244 ret = rcar_pcie_config_access(dev, RCAR_PCI_ACCESS_WRITE,
250 static int rcar_gen3_pcie_wait_for_phyrdy(struct udevice *dev)
252 struct rcar_gen3_pcie_priv *priv = dev_get_platdata(dev);
254 return wait_for_bit_le32((void *)priv->regs + PCIEPHYSR, PHYRDY,
258 static int rcar_gen3_pcie_wait_for_dl(struct udevice *dev)
260 struct rcar_gen3_pcie_priv *priv = dev_get_platdata(dev);
262 return wait_for_bit_le32((void *)priv->regs + PCIETSTR,
263 DATA_LINK_ACTIVE, true, 50, false);
266 static int rcar_gen3_pcie_hw_init(struct udevice *dev)
268 struct rcar_gen3_pcie_priv *priv = dev_get_platdata(dev);
271 /* Begin initialization */
272 writel(0, priv->regs + PCIETCTLR);
275 writel(1, priv->regs + PCIEMSR);
277 ret = rcar_gen3_pcie_wait_for_phyrdy(dev);
282 * Initial header for port config space is type 1, set the device
283 * class to match. Hardware takes care of propagating the IDSETR
284 * settings, so there is no need to bother with a quirk.
286 writel(PCI_CLASS_BRIDGE_PCI << 16, priv->regs + IDSETR1);
289 * Setup Secondary Bus Number & Subordinate Bus Number, even though
290 * they aren't used, to avoid bridge being detected as broken.
292 rcar_rmw32(dev, RCONF(PCI_SECONDARY_BUS), 0xff, 1);
293 rcar_rmw32(dev, RCONF(PCI_SUBORDINATE_BUS), 0xff, 1);
295 /* Initialize default capabilities. */
296 rcar_rmw32(dev, REXPCAP(0), 0xff, PCI_CAP_ID_EXP);
297 rcar_rmw32(dev, REXPCAP(PCI_EXP_FLAGS),
298 PCI_EXP_FLAGS_TYPE, PCI_EXP_TYPE_ROOT_PORT << 4);
299 rcar_rmw32(dev, RCONF(PCI_HEADER_TYPE), 0x7f,
300 PCI_HEADER_TYPE_BRIDGE);
302 /* Enable data link layer active state reporting */
303 rcar_rmw32(dev, REXPCAP(PCI_EXP_LNKCAP),
304 PCI_EXP_LNKCAP_DLLLARC, PCI_EXP_LNKCAP_DLLLARC);
306 /* Write out the physical slot number = 0 */
307 rcar_rmw32(dev, REXPCAP(PCI_EXP_SLTCAP),
308 PCI_EXP_SLTCAP_PSN, 0);
310 /* Set the completion timer timeout to the maximum 50ms. */
311 rcar_rmw32(dev, TLCTLR + 1, 0x3f, 50);
313 /* Terminate list of capabilities (Next Capability Offset=0) */
314 rcar_rmw32(dev, RVCCAP(0), 0xfff00000, 0);
316 /* Finish initialization - establish a PCI Express link */
317 writel(CFINIT, priv->regs + PCIETCTLR);
319 return rcar_gen3_pcie_wait_for_dl(dev);
322 static int rcar_gen3_pcie_probe(struct udevice *dev)
324 struct rcar_gen3_pcie_priv *priv = dev_get_platdata(dev);
325 struct pci_controller *hose = dev_get_uclass_priv(dev);
330 ret = clk_get_by_index(dev, 0, &pci_clk);
334 ret = clk_enable(&pci_clk);
338 for (i = 0; i < hose->region_count; i++) {
339 if (hose->regions[i].flags != PCI_REGION_SYS_MEMORY)
342 if (hose->regions[i].phys_start == 0)
345 mask = (hose->regions[i].size - 1) & ~0xf;
347 writel(hose->regions[i].phys_start, priv->regs + PCIEPRAR(0));
348 writel(hose->regions[i].phys_start, priv->regs + PCIELAR(0));
349 writel(mask, priv->regs + PCIELAMR(0));
353 writel(0, priv->regs + PCIEPRAR(4));
354 writel(0, priv->regs + PCIELAR(4));
355 writel(0, priv->regs + PCIELAMR(4));
357 ret = rcar_gen3_pcie_hw_init(dev);
361 for (i = 0, cnt = 0; i < hose->region_count; i++) {
362 if (hose->regions[i].flags == PCI_REGION_SYS_MEMORY)
365 writel(0, priv->regs + PCIEPTCTLR(cnt));
366 writel((hose->regions[i].size - 1) & ~0x7f,
367 priv->regs + PCIEPAMR(cnt));
368 writel(upper_32_bits(hose->regions[i].phys_start),
369 priv->regs + PCIEPAUR(cnt));
370 writel(lower_32_bits(hose->regions[i].phys_start),
371 priv->regs + PCIEPALR(cnt));
373 if (hose->regions[i].flags == PCI_REGION_IO)
375 writel(mask, priv->regs + PCIEPTCTLR(cnt));
383 static int rcar_gen3_pcie_ofdata_to_platdata(struct udevice *dev)
385 struct rcar_gen3_pcie_priv *priv = dev_get_platdata(dev);
387 priv->regs = devfdt_get_addr_index(dev, 0);
394 static const struct dm_pci_ops rcar_gen3_pcie_ops = {
395 .read_config = rcar_gen3_pcie_read_config,
396 .write_config = rcar_gen3_pcie_write_config,
399 static const struct udevice_id rcar_gen3_pcie_ids[] = {
400 { .compatible = "renesas,pcie-rcar-gen3" },
404 U_BOOT_DRIVER(rcar_gen3_pcie) = {
405 .name = "rcar_gen3_pcie",
407 .of_match = rcar_gen3_pcie_ids,
408 .ops = &rcar_gen3_pcie_ops,
409 .probe = rcar_gen3_pcie_probe,
410 .ofdata_to_platdata = rcar_gen3_pcie_ofdata_to_platdata,
411 .platdata_auto_alloc_size = sizeof(struct rcar_gen3_pcie_priv),