1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Copyright 2017 NXP 4 * Copyright 2014-2015 Freescale Semiconductor, Inc. 5 * Layerscape PCIe driver 6 */ 7 8 #include <common.h> 9 #include <pci.h> 10 #include <asm/arch/fsl_serdes.h> 11 #include <asm/io.h> 12 #include <errno.h> 13 #ifdef CONFIG_OF_BOARD_SETUP 14 #include <linux/libfdt.h> 15 #include <fdt_support.h> 16 #ifdef CONFIG_ARM 17 #include <asm/arch/clock.h> 18 #endif 19 #include "pcie_layerscape.h" 20 21 #if defined(CONFIG_FSL_LSCH3) || defined(CONFIG_FSL_LSCH2) 22 /* 23 * Return next available LUT index. 24 */ 25 static int ls_pcie_next_lut_index(struct ls_pcie *pcie) 26 { 27 if (pcie->next_lut_index < PCIE_LUT_ENTRY_COUNT) 28 return pcie->next_lut_index++; 29 else 30 return -ENOSPC; /* LUT is full */ 31 } 32 33 /* returns the next available streamid for pcie, -errno if failed */ 34 static int ls_pcie_next_streamid(void) 35 { 36 static int next_stream_id = FSL_PEX_STREAM_ID_START; 37 38 if (next_stream_id > FSL_PEX_STREAM_ID_END) 39 return -EINVAL; 40 41 return next_stream_id++; 42 } 43 44 static void lut_writel(struct ls_pcie *pcie, unsigned int value, 45 unsigned int offset) 46 { 47 if (pcie->big_endian) 48 out_be32(pcie->lut + offset, value); 49 else 50 out_le32(pcie->lut + offset, value); 51 } 52 53 /* 54 * Program a single LUT entry 55 */ 56 static void ls_pcie_lut_set_mapping(struct ls_pcie *pcie, int index, u32 devid, 57 u32 streamid) 58 { 59 /* leave mask as all zeroes, want to match all bits */ 60 lut_writel(pcie, devid << 16, PCIE_LUT_UDR(index)); 61 lut_writel(pcie, streamid | PCIE_LUT_ENABLE, PCIE_LUT_LDR(index)); 62 } 63 64 /* 65 * An msi-map is a property to be added to the pci controller 66 * node. It is a table, where each entry consists of 4 fields 67 * e.g.: 68 * 69 * msi-map = <[devid] [phandle-to-msi-ctrl] [stream-id] [count] 70 * [devid] [phandle-to-msi-ctrl] [stream-id] [count]>; 71 */ 72 static void fdt_pcie_set_msi_map_entry(void *blob, struct ls_pcie *pcie, 73 u32 devid, u32 streamid) 74 { 75 u32 *prop; 76 u32 phandle; 77 int nodeoffset; 78 uint svr; 79 char *compat = NULL; 80 81 /* find pci controller node */ 82 nodeoffset = fdt_node_offset_by_compat_reg(blob, "fsl,ls-pcie", 83 pcie->dbi_res.start); 84 if (nodeoffset < 0) { 85 #ifdef CONFIG_FSL_PCIE_COMPAT /* Compatible with older version of dts node */ 86 svr = (get_svr() >> SVR_VAR_PER_SHIFT) & 0xFFFFFE; 87 if (svr == SVR_LS2088A || svr == SVR_LS2084A || 88 svr == SVR_LS2048A || svr == SVR_LS2044A || 89 svr == SVR_LS2081A || svr == SVR_LS2041A) 90 compat = "fsl,ls2088a-pcie"; 91 else 92 compat = CONFIG_FSL_PCIE_COMPAT; 93 if (compat) 94 nodeoffset = fdt_node_offset_by_compat_reg(blob, 95 compat, pcie->dbi_res.start); 96 #endif 97 if (nodeoffset < 0) 98 return; 99 } 100 101 /* get phandle to MSI controller */ 102 prop = (u32 *)fdt_getprop(blob, nodeoffset, "msi-parent", 0); 103 if (prop == NULL) { 104 debug("\n%s: ERROR: missing msi-parent: PCIe%d\n", 105 __func__, pcie->idx); 106 return; 107 } 108 phandle = fdt32_to_cpu(*prop); 109 110 /* set one msi-map row */ 111 fdt_appendprop_u32(blob, nodeoffset, "msi-map", devid); 112 fdt_appendprop_u32(blob, nodeoffset, "msi-map", phandle); 113 fdt_appendprop_u32(blob, nodeoffset, "msi-map", streamid); 114 fdt_appendprop_u32(blob, nodeoffset, "msi-map", 1); 115 } 116 117 /* 118 * An iommu-map is a property to be added to the pci controller 119 * node. It is a table, where each entry consists of 4 fields 120 * e.g.: 121 * 122 * iommu-map = <[devid] [phandle-to-iommu-ctrl] [stream-id] [count] 123 * [devid] [phandle-to-iommu-ctrl] [stream-id] [count]>; 124 */ 125 static void fdt_pcie_set_iommu_map_entry(void *blob, struct ls_pcie *pcie, 126 u32 devid, u32 streamid) 127 { 128 u32 *prop; 129 u32 iommu_map[4]; 130 int nodeoffset; 131 int lenp; 132 uint svr; 133 char *compat = NULL; 134 135 /* find pci controller node */ 136 nodeoffset = fdt_node_offset_by_compat_reg(blob, "fsl,ls-pcie", 137 pcie->dbi_res.start); 138 if (nodeoffset < 0) { 139 #ifdef CONFIG_FSL_PCIE_COMPAT /* Compatible with older version of dts node */ 140 svr = (get_svr() >> SVR_VAR_PER_SHIFT) & 0xFFFFFE; 141 if (svr == SVR_LS2088A || svr == SVR_LS2084A || 142 svr == SVR_LS2048A || svr == SVR_LS2044A || 143 svr == SVR_LS2081A || svr == SVR_LS2041A) 144 compat = "fsl,ls2088a-pcie"; 145 else 146 compat = CONFIG_FSL_PCIE_COMPAT; 147 148 if (compat) 149 nodeoffset = fdt_node_offset_by_compat_reg(blob, 150 compat, pcie->dbi_res.start); 151 #endif 152 if (nodeoffset < 0) 153 return; 154 } 155 156 /* get phandle to iommu controller */ 157 prop = fdt_getprop_w(blob, nodeoffset, "iommu-map", &lenp); 158 if (prop == NULL) { 159 debug("\n%s: ERROR: missing iommu-map: PCIe%d\n", 160 __func__, pcie->idx); 161 return; 162 } 163 164 /* set iommu-map row */ 165 iommu_map[0] = cpu_to_fdt32(devid); 166 iommu_map[1] = *++prop; 167 iommu_map[2] = cpu_to_fdt32(streamid); 168 iommu_map[3] = cpu_to_fdt32(1); 169 170 if (devid == 0) { 171 fdt_setprop_inplace(blob, nodeoffset, "iommu-map", 172 iommu_map, 16); 173 } else { 174 fdt_appendprop(blob, nodeoffset, "iommu-map", iommu_map, 16); 175 } 176 } 177 178 static void fdt_fixup_pcie(void *blob) 179 { 180 struct udevice *dev, *bus; 181 struct ls_pcie *pcie; 182 int streamid; 183 int index; 184 pci_dev_t bdf; 185 186 /* Scan all known buses */ 187 for (pci_find_first_device(&dev); 188 dev; 189 pci_find_next_device(&dev)) { 190 for (bus = dev; device_is_on_pci_bus(bus);) 191 bus = bus->parent; 192 pcie = dev_get_priv(bus); 193 194 streamid = ls_pcie_next_streamid(); 195 if (streamid < 0) { 196 debug("ERROR: no stream ids free\n"); 197 continue; 198 } 199 200 index = ls_pcie_next_lut_index(pcie); 201 if (index < 0) { 202 debug("ERROR: no LUT indexes free\n"); 203 continue; 204 } 205 206 /* the DT fixup must be relative to the hose first_busno */ 207 bdf = dm_pci_get_bdf(dev) - PCI_BDF(bus->seq, 0, 0); 208 /* map PCI b.d.f to streamID in LUT */ 209 ls_pcie_lut_set_mapping(pcie, index, bdf >> 8, 210 streamid); 211 /* update msi-map in device tree */ 212 fdt_pcie_set_msi_map_entry(blob, pcie, bdf >> 8, 213 streamid); 214 /* update iommu-map in device tree */ 215 fdt_pcie_set_iommu_map_entry(blob, pcie, bdf >> 8, 216 streamid); 217 } 218 } 219 #endif 220 221 static void ft_pcie_ls_setup(void *blob, struct ls_pcie *pcie) 222 { 223 int off; 224 uint svr; 225 char *compat = NULL; 226 227 off = fdt_node_offset_by_compat_reg(blob, "fsl,ls-pcie", 228 pcie->dbi_res.start); 229 if (off < 0) { 230 #ifdef CONFIG_FSL_PCIE_COMPAT /* Compatible with older version of dts node */ 231 svr = (get_svr() >> SVR_VAR_PER_SHIFT) & 0xFFFFFE; 232 if (svr == SVR_LS2088A || svr == SVR_LS2084A || 233 svr == SVR_LS2048A || svr == SVR_LS2044A || 234 svr == SVR_LS2081A || svr == SVR_LS2041A) 235 compat = "fsl,ls2088a-pcie"; 236 else 237 compat = CONFIG_FSL_PCIE_COMPAT; 238 if (compat) 239 off = fdt_node_offset_by_compat_reg(blob, 240 compat, pcie->dbi_res.start); 241 #endif 242 if (off < 0) 243 return; 244 } 245 246 if (pcie->enabled) 247 fdt_set_node_status(blob, off, FDT_STATUS_OKAY, 0); 248 else 249 fdt_set_node_status(blob, off, FDT_STATUS_DISABLED, 0); 250 } 251 252 /* Fixup Kernel DT for PCIe */ 253 void ft_pci_setup(void *blob, bd_t *bd) 254 { 255 struct ls_pcie *pcie; 256 257 list_for_each_entry(pcie, &ls_pcie_list, list) 258 ft_pcie_ls_setup(blob, pcie); 259 260 #if defined(CONFIG_FSL_LSCH3) || defined(CONFIG_FSL_LSCH2) 261 fdt_fixup_pcie(blob); 262 #endif 263 } 264 265 #else /* !CONFIG_OF_BOARD_SETUP */ 266 void ft_pci_setup(void *blob, bd_t *bd) 267 { 268 } 269 #endif 270