1 // SPDX-License-Identifier: GPL-2.0
3 * Renesas R-Car Gen3 PCIEC driver
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
24 #include <linux/bitops.h>
25 #include <linux/log2.h>
27 #define PCIECAR 0x000010
28 #define PCIECCTLR 0x000018
29 #define 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
122 RCAR_PCI_ACCESS_READ,
123 RCAR_PCI_ACCESS_WRITE,
126 struct rcar_gen3_pcie_priv {
130 static void rcar_rmw32(struct udevice *dev, int where, u32 mask, u32 data)
132 struct rcar_gen3_pcie_priv *priv = dev_get_plat(dev);
133 int shift = 8 * (where & 3);
135 clrsetbits_le32(priv->regs + (where & ~3),
136 mask << shift, data << shift);
139 static u32 rcar_read_conf(const struct udevice *dev, int where)
141 struct rcar_gen3_pcie_priv *priv = dev_get_plat(dev);
142 int shift = 8 * (where & 3);
144 return readl(priv->regs + (where & ~3)) >> shift;
147 static int rcar_pcie_config_access(const struct udevice *udev,
148 unsigned char access_type,
149 pci_dev_t bdf, int where, ulong *data)
151 struct rcar_gen3_pcie_priv *priv = dev_get_plat(udev);
152 u32 reg = where & ~3;
155 if (PCI_DEV(bdf) == 0) {
156 if (access_type == RCAR_PCI_ACCESS_READ)
157 *data = readl(priv->regs + PCICONF(where / 4));
159 writel(*data, priv->regs + PCICONF(where / 4));
165 clrbits_le32(priv->regs + PCIEERRFR, 0);
167 /* Set the PIO address */
168 writel((bdf << 8) | reg, priv->regs + PCIECAR);
170 /* Enable the configuration access */
172 writel(SEND_ENABLE | TYPE0, priv->regs + PCIECCTLR);
174 writel(SEND_ENABLE | TYPE1, priv->regs + PCIECCTLR);
176 /* Check for errors */
177 if (readl(priv->regs + PCIEERRFR) & UNSUPPORTED_REQUEST)
180 /* Check for master and target aborts */
181 if (rcar_read_conf(udev, RCONF(PCI_STATUS)) &
182 (PCI_STATUS_REC_MASTER_ABORT | PCI_STATUS_REC_TARGET_ABORT))
185 if (access_type == RCAR_PCI_ACCESS_READ)
186 *data = readl(priv->regs + PCIECDR);
188 writel(*data, priv->regs + PCIECDR);
190 /* Disable the configuration access */
191 writel(0, priv->regs + PCIECCTLR);
196 static int rcar_gen3_pcie_addr_valid(pci_dev_t d, uint where)
213 static int rcar_gen3_pcie_read_config(const struct udevice *dev, pci_dev_t bdf,
214 uint where, ulong *val,
215 enum pci_size_t size)
220 ret = rcar_gen3_pcie_addr_valid(bdf, where);
222 *val = pci_get_ff(size);
226 ret = rcar_pcie_config_access(dev, RCAR_PCI_ACCESS_READ,
231 *val = pci_conv_32_to_size(reg, where, size);
236 static int rcar_gen3_pcie_write_config(struct udevice *dev, pci_dev_t bdf,
237 uint where, ulong val,
238 enum pci_size_t size)
243 ret = rcar_gen3_pcie_addr_valid(bdf, where);
247 data = pci_conv_32_to_size(val, where, size);
249 ret = rcar_pcie_config_access(dev, RCAR_PCI_ACCESS_WRITE,
255 static int rcar_gen3_pcie_wait_for_phyrdy(struct udevice *dev)
257 struct rcar_gen3_pcie_priv *priv = dev_get_plat(dev);
259 return wait_for_bit_le32((void *)priv->regs + PCIEPHYSR, PHYRDY,
263 static int rcar_gen3_pcie_wait_for_dl(struct udevice *dev)
265 struct rcar_gen3_pcie_priv *priv = dev_get_plat(dev);
267 return wait_for_bit_le32((void *)priv->regs + PCIETSTR,
268 DATA_LINK_ACTIVE, true, 50, false);
271 static int rcar_gen3_pcie_hw_init(struct udevice *dev)
273 struct rcar_gen3_pcie_priv *priv = dev_get_plat(dev);
276 /* Begin initialization */
277 writel(0, priv->regs + PCIETCTLR);
280 writel(1, priv->regs + PCIEMSR);
282 ret = rcar_gen3_pcie_wait_for_phyrdy(dev);
287 * Initial header for port config space is type 1, set the device
288 * class to match. Hardware takes care of propagating the IDSETR
289 * settings, so there is no need to bother with a quirk.
291 writel(PCI_CLASS_BRIDGE_PCI_NORMAL << 8, priv->regs + IDSETR1);
294 * Setup Secondary Bus Number & Subordinate Bus Number, even though
295 * they aren't used, to avoid bridge being detected as broken.
297 rcar_rmw32(dev, RCONF(PCI_SECONDARY_BUS), 0xff, 1);
298 rcar_rmw32(dev, RCONF(PCI_SUBORDINATE_BUS), 0xff, 1);
300 /* Initialize default capabilities. */
301 rcar_rmw32(dev, REXPCAP(0), 0xff, PCI_CAP_ID_EXP);
302 rcar_rmw32(dev, REXPCAP(PCI_EXP_FLAGS),
303 PCI_EXP_FLAGS_TYPE, PCI_EXP_TYPE_ROOT_PORT << 4);
304 rcar_rmw32(dev, RCONF(PCI_HEADER_TYPE), 0x7f,
305 PCI_HEADER_TYPE_BRIDGE);
307 /* Enable data link layer active state reporting */
308 rcar_rmw32(dev, REXPCAP(PCI_EXP_LNKCAP),
309 PCI_EXP_LNKCAP_DLLLARC, PCI_EXP_LNKCAP_DLLLARC);
311 /* Write out the physical slot number = 0 */
312 rcar_rmw32(dev, REXPCAP(PCI_EXP_SLTCAP),
313 PCI_EXP_SLTCAP_PSN, 0);
315 /* Set the completion timer timeout to the maximum 50ms. */
316 rcar_rmw32(dev, TLCTLR + 1, 0x3f, 50);
318 /* Terminate list of capabilities (Next Capability Offset=0) */
319 rcar_rmw32(dev, RVCCAP(0), 0xfff00000, 0);
321 /* Finish initialization - establish a PCI Express link */
322 writel(CFINIT, priv->regs + PCIETCTLR);
324 return rcar_gen3_pcie_wait_for_dl(dev);
327 static int rcar_gen3_pcie_probe(struct udevice *dev)
329 struct rcar_gen3_pcie_priv *priv = dev_get_plat(dev);
330 struct pci_controller *hose = dev_get_uclass_priv(dev);
335 ret = clk_get_by_index(dev, 0, &pci_clk);
339 ret = clk_enable(&pci_clk);
343 for (i = 0; i < hose->region_count; i++) {
344 if (hose->regions[i].flags != PCI_REGION_SYS_MEMORY)
347 if (hose->regions[i].phys_start == 0)
350 mask = (roundup_pow_of_two(hose->regions[i].size) - 1) & ~0xf;
352 writel(rounddown_pow_of_two(hose->regions[i].phys_start),
353 priv->regs + PCIEPRAR(0));
354 writel(rounddown_pow_of_two(hose->regions[i].phys_start),
355 priv->regs + PCIELAR(0));
356 writel(mask, priv->regs + PCIELAMR(0));
360 writel(0, priv->regs + PCIEPRAR(1));
361 writel(0, priv->regs + PCIELAR(1));
362 writel(0, priv->regs + PCIELAMR(1));
364 ret = rcar_gen3_pcie_hw_init(dev);
368 for (i = 0, cnt = 0; i < hose->region_count; i++) {
369 if (hose->regions[i].flags == PCI_REGION_SYS_MEMORY)
372 writel(0, priv->regs + PCIEPTCTLR(cnt));
373 writel((hose->regions[i].size - 1) & ~0x7f,
374 priv->regs + PCIEPAMR(cnt));
375 writel(upper_32_bits(hose->regions[i].phys_start),
376 priv->regs + PCIEPAUR(cnt));
377 writel(lower_32_bits(hose->regions[i].phys_start),
378 priv->regs + PCIEPALR(cnt));
380 if (hose->regions[i].flags == PCI_REGION_IO)
382 writel(mask, priv->regs + PCIEPTCTLR(cnt));
390 static int rcar_gen3_pcie_of_to_plat(struct udevice *dev)
392 struct rcar_gen3_pcie_priv *priv = dev_get_plat(dev);
394 priv->regs = devfdt_get_addr_index(dev, 0);
401 static const struct dm_pci_ops rcar_gen3_pcie_ops = {
402 .read_config = rcar_gen3_pcie_read_config,
403 .write_config = rcar_gen3_pcie_write_config,
406 static const struct udevice_id rcar_gen3_pcie_ids[] = {
407 { .compatible = "renesas,pcie-rcar-gen3" },
411 U_BOOT_DRIVER(rcar_gen3_pcie) = {
412 .name = "rcar_gen3_pcie",
414 .of_match = rcar_gen3_pcie_ids,
415 .ops = &rcar_gen3_pcie_ops,
416 .probe = rcar_gen3_pcie_probe,
417 .of_to_plat = rcar_gen3_pcie_of_to_plat,
418 .plat_auto = sizeof(struct rcar_gen3_pcie_priv),