1 // SPDX-License-Identifier: GPL-2.0+ OR X11
3 * Copyright 2018-2020 NXP
5 * PCIe Gen4 driver for NXP Layerscape SoCs
6 * Author: Hou Zhiqiang <Minder.Hou@gmail.com>
12 #include <asm/arch/fsl_serdes.h>
15 #ifdef CONFIG_OF_BOARD_SETUP
16 #include <linux/libfdt.h>
17 #include <fdt_support.h>
19 #include <asm/arch/clock.h>
21 #include "pcie_layerscape_gen4.h"
22 #include "pcie_layerscape_fixup_common.h"
24 #if defined(CONFIG_FSL_LSCH3) || defined(CONFIG_FSL_LSCH2)
26 * Return next available LUT index.
28 static int ls_pcie_g4_next_lut_index(struct ls_pcie_g4 *pcie)
30 if (pcie->next_lut_index < PCIE_LUT_ENTRY_COUNT)
31 return pcie->next_lut_index++;
33 return -ENOSPC; /* LUT is full */
36 /* returns the next available streamid for pcie, -errno if failed */
37 static int ls_pcie_g4_next_streamid(struct ls_pcie_g4 *pcie)
39 int stream_id = pcie->stream_id_cur;
41 if (stream_id > FSL_PEX_STREAM_ID_END)
44 pcie->stream_id_cur++;
46 return stream_id | ((pcie->idx + 1) << 11);
50 * Program a single LUT entry
52 static void ls_pcie_g4_lut_set_mapping(struct ls_pcie_g4 *pcie, int index,
53 u32 devid, u32 streamid)
55 /* leave mask as all zeroes, want to match all bits */
56 lut_writel(pcie, devid << 16, PCIE_LUT_UDR(index));
57 lut_writel(pcie, streamid | PCIE_LUT_ENABLE, PCIE_LUT_LDR(index));
61 * An msi-map is a property to be added to the pci controller
62 * node. It is a table, where each entry consists of 4 fields
65 * msi-map = <[devid] [phandle-to-msi-ctrl] [stream-id] [count]
66 * [devid] [phandle-to-msi-ctrl] [stream-id] [count]>;
68 static void fdt_pcie_set_msi_map_entry_ls_gen4(void *blob,
69 struct ls_pcie_g4 *pcie,
70 u32 devid, u32 streamid)
76 #ifdef CONFIG_FSL_PCIE_COMPAT
77 nodeoff = fdt_node_offset_by_compat_reg(blob, CONFIG_FSL_PCIE_COMPAT,
78 pcie->ccsr_res.start);
80 #error "No CONFIG_FSL_PCIE_COMPAT defined"
83 debug("%s: ERROR: failed to find pcie compatiable\n", __func__);
87 /* get phandle to MSI controller */
88 prop = (u32 *)fdt_getprop(blob, nodeoff, "msi-parent", 0);
90 debug("\n%s: ERROR: missing msi-parent: PCIe%d\n",
94 phandle = fdt32_to_cpu(*prop);
96 /* set one msi-map row */
97 fdt_appendprop_u32(blob, nodeoff, "msi-map", devid);
98 fdt_appendprop_u32(blob, nodeoff, "msi-map", phandle);
99 fdt_appendprop_u32(blob, nodeoff, "msi-map", streamid);
100 fdt_appendprop_u32(blob, nodeoff, "msi-map", 1);
104 * An iommu-map is a property to be added to the pci controller
105 * node. It is a table, where each entry consists of 4 fields
108 * iommu-map = <[devid] [phandle-to-iommu-ctrl] [stream-id] [count]
109 * [devid] [phandle-to-iommu-ctrl] [stream-id] [count]>;
111 static void fdt_pcie_set_iommu_map_entry_ls_gen4(void *blob,
112 struct ls_pcie_g4 *pcie,
113 u32 devid, u32 streamid)
120 #ifdef CONFIG_FSL_PCIE_COMPAT
121 nodeoff = fdt_node_offset_by_compat_reg(blob, CONFIG_FSL_PCIE_COMPAT,
122 pcie->ccsr_res.start);
124 #error "No CONFIG_FSL_PCIE_COMPAT defined"
127 debug("%s: ERROR: failed to find pcie compatiable\n", __func__);
131 /* get phandle to iommu controller */
132 prop = fdt_getprop_w(blob, nodeoff, "iommu-map", &lenp);
134 debug("\n%s: ERROR: missing iommu-map: PCIe%d\n",
135 __func__, pcie->idx);
139 /* set iommu-map row */
140 iommu_map[0] = cpu_to_fdt32(devid);
141 iommu_map[1] = *++prop;
142 iommu_map[2] = cpu_to_fdt32(streamid);
143 iommu_map[3] = cpu_to_fdt32(1);
146 fdt_setprop_inplace(blob, nodeoff, "iommu-map", iommu_map, 16);
148 fdt_appendprop(blob, nodeoff, "iommu-map", iommu_map, 16);
151 static void fdt_fixup_pcie_ls_gen4(void *blob)
153 struct udevice *dev, *bus;
154 struct ls_pcie_g4 *pcie;
159 /* Scan all known buses */
160 for (pci_find_first_device(&dev); dev; pci_find_next_device(&dev)) {
161 for (bus = dev; device_is_on_pci_bus(bus);)
163 pcie = dev_get_priv(bus);
165 streamid = ls_pcie_g4_next_streamid(pcie);
167 debug("ERROR: no stream ids free\n");
171 index = ls_pcie_g4_next_lut_index(pcie);
173 debug("ERROR: no LUT indexes free\n");
177 /* the DT fixup must be relative to the hose first_busno */
178 bdf = dm_pci_get_bdf(dev) - PCI_BDF(bus->seq, 0, 0);
179 /* map PCI b.d.f to streamID in LUT */
180 ls_pcie_g4_lut_set_mapping(pcie, index, bdf >> 8, streamid);
181 /* update msi-map in device tree */
182 fdt_pcie_set_msi_map_entry_ls_gen4(blob, pcie, bdf >> 8,
184 /* update iommu-map in device tree */
185 fdt_pcie_set_iommu_map_entry_ls_gen4(blob, pcie, bdf >> 8,
191 static void ft_pcie_ep_layerscape_gen4_fix(void *blob, struct ls_pcie_g4 *pcie)
195 off = fdt_node_offset_by_compat_reg(blob, CONFIG_FSL_PCIE_EP_COMPAT,
196 pcie->ccsr_res.start);
199 debug("%s: ERROR: failed to find pcie compatiable\n",
204 if (pcie->enabled && pcie->mode == PCI_HEADER_TYPE_NORMAL)
205 fdt_set_node_status(blob, off, FDT_STATUS_OKAY, 0);
207 fdt_set_node_status(blob, off, FDT_STATUS_DISABLED, 0);
210 static void ft_pcie_rc_layerscape_gen4_fix(void *blob, struct ls_pcie_g4 *pcie)
214 #ifdef CONFIG_FSL_PCIE_COMPAT
215 off = fdt_node_offset_by_compat_reg(blob, CONFIG_FSL_PCIE_COMPAT,
216 pcie->ccsr_res.start);
218 #error "No CONFIG_FSL_PCIE_COMPAT defined"
221 debug("%s: ERROR: failed to find pcie compatiable\n", __func__);
225 if (pcie->enabled && pcie->mode == PCI_HEADER_TYPE_BRIDGE)
226 fdt_set_node_status(blob, off, FDT_STATUS_OKAY, 0);
228 fdt_set_node_status(blob, off, FDT_STATUS_DISABLED, 0);
231 static void ft_pcie_layerscape_gen4_setup(void *blob, struct ls_pcie_g4 *pcie)
233 ft_pcie_rc_layerscape_gen4_fix(blob, pcie);
234 ft_pcie_ep_layerscape_gen4_fix(blob, pcie);
237 /* Fixup Kernel DT for PCIe */
238 void ft_pci_setup_ls_gen4(void *blob, bd_t *bd)
240 struct ls_pcie_g4 *pcie;
242 list_for_each_entry(pcie, &ls_pcie_g4_list, list)
243 ft_pcie_layerscape_gen4_setup(blob, pcie);
245 #if defined(CONFIG_FSL_LSCH3) || defined(CONFIG_FSL_LSCH2)
246 fdt_fixup_pcie_ls_gen4(blob);
250 #else /* !CONFIG_OF_BOARD_SETUP */
251 void ft_pci_setup_ls_gen4(void *blob, bd_t *bd)