1 /* 2 * Copyright 2017 NXP 3 * Copyright 2014-2015 Freescale Semiconductor, Inc. 4 * Layerscape PCIe driver 5 * 6 * SPDX-License-Identifier: GPL-2.0+ 7 */ 8 9 #include <common.h> 10 #include <pci.h> 11 #include <asm/arch/fsl_serdes.h> 12 #include <asm/io.h> 13 #include <errno.h> 14 #ifdef CONFIG_OF_BOARD_SETUP 15 #include <linux/libfdt.h> 16 #include <fdt_support.h> 17 #ifdef CONFIG_ARM 18 #include <asm/arch/clock.h> 19 #endif 20 #include "pcie_layerscape.h" 21 22 #if defined(CONFIG_FSL_LSCH3) || defined(CONFIG_FSL_LSCH2) 23 /* 24 * Return next available LUT index. 25 */ 26 static int ls_pcie_next_lut_index(struct ls_pcie *pcie) 27 { 28 if (pcie->next_lut_index < PCIE_LUT_ENTRY_COUNT) 29 return pcie->next_lut_index++; 30 else 31 return -ENOSPC; /* LUT is full */ 32 } 33 34 /* returns the next available streamid for pcie, -errno if failed */ 35 static int ls_pcie_next_streamid(void) 36 { 37 static int next_stream_id = FSL_PEX_STREAM_ID_START; 38 39 if (next_stream_id > FSL_PEX_STREAM_ID_END) 40 return -EINVAL; 41 42 return next_stream_id++; 43 } 44 45 static void lut_writel(struct ls_pcie *pcie, unsigned int value, 46 unsigned int offset) 47 { 48 if (pcie->big_endian) 49 out_be32(pcie->lut + offset, value); 50 else 51 out_le32(pcie->lut + offset, value); 52 } 53 54 /* 55 * Program a single LUT entry 56 */ 57 static void ls_pcie_lut_set_mapping(struct ls_pcie *pcie, int index, u32 devid, 58 u32 streamid) 59 { 60 /* leave mask as all zeroes, want to match all bits */ 61 lut_writel(pcie, devid << 16, PCIE_LUT_UDR(index)); 62 lut_writel(pcie, streamid | PCIE_LUT_ENABLE, PCIE_LUT_LDR(index)); 63 } 64 65 /* 66 * An msi-map is a property to be added to the pci controller 67 * node. It is a table, where each entry consists of 4 fields 68 * e.g.: 69 * 70 * msi-map = <[devid] [phandle-to-msi-ctrl] [stream-id] [count] 71 * [devid] [phandle-to-msi-ctrl] [stream-id] [count]>; 72 */ 73 static void fdt_pcie_set_msi_map_entry(void *blob, struct ls_pcie *pcie, 74 u32 devid, u32 streamid) 75 { 76 u32 *prop; 77 u32 phandle; 78 int nodeoffset; 79 uint svr; 80 char *compat = NULL; 81 82 /* find pci controller node */ 83 nodeoffset = fdt_node_offset_by_compat_reg(blob, "fsl,ls-pcie", 84 pcie->dbi_res.start); 85 if (nodeoffset < 0) { 86 #ifdef CONFIG_FSL_PCIE_COMPAT /* Compatible with older version of dts node */ 87 svr = (get_svr() >> SVR_VAR_PER_SHIFT) & 0xFFFFFE; 88 if (svr == SVR_LS2088A || svr == SVR_LS2084A || 89 svr == SVR_LS2048A || svr == SVR_LS2044A || 90 svr == SVR_LS2081A || svr == SVR_LS2041A) 91 compat = "fsl,ls2088a-pcie"; 92 else 93 compat = CONFIG_FSL_PCIE_COMPAT; 94 if (compat) 95 nodeoffset = fdt_node_offset_by_compat_reg(blob, 96 compat, pcie->dbi_res.start); 97 #endif 98 if (nodeoffset < 0) 99 return; 100 } 101 102 /* get phandle to MSI controller */ 103 prop = (u32 *)fdt_getprop(blob, nodeoffset, "msi-parent", 0); 104 if (prop == NULL) { 105 debug("\n%s: ERROR: missing msi-parent: PCIe%d\n", 106 __func__, pcie->idx); 107 return; 108 } 109 phandle = fdt32_to_cpu(*prop); 110 111 /* set one msi-map row */ 112 fdt_appendprop_u32(blob, nodeoffset, "msi-map", devid); 113 fdt_appendprop_u32(blob, nodeoffset, "msi-map", phandle); 114 fdt_appendprop_u32(blob, nodeoffset, "msi-map", streamid); 115 fdt_appendprop_u32(blob, nodeoffset, "msi-map", 1); 116 } 117 118 /* 119 * An iommu-map is a property to be added to the pci controller 120 * node. It is a table, where each entry consists of 4 fields 121 * e.g.: 122 * 123 * iommu-map = <[devid] [phandle-to-iommu-ctrl] [stream-id] [count] 124 * [devid] [phandle-to-iommu-ctrl] [stream-id] [count]>; 125 */ 126 static void fdt_pcie_set_iommu_map_entry(void *blob, struct ls_pcie *pcie, 127 u32 devid, u32 streamid) 128 { 129 u32 *prop; 130 u32 iommu_map[4]; 131 int nodeoffset; 132 int lenp; 133 uint svr; 134 char *compat = NULL; 135 136 /* find pci controller node */ 137 nodeoffset = fdt_node_offset_by_compat_reg(blob, "fsl,ls-pcie", 138 pcie->dbi_res.start); 139 if (nodeoffset < 0) { 140 #ifdef CONFIG_FSL_PCIE_COMPAT /* Compatible with older version of dts node */ 141 svr = (get_svr() >> SVR_VAR_PER_SHIFT) & 0xFFFFFE; 142 if (svr == SVR_LS2088A || svr == SVR_LS2084A || 143 svr == SVR_LS2048A || svr == SVR_LS2044A || 144 svr == SVR_LS2081A || svr == SVR_LS2041A) 145 compat = "fsl,ls2088a-pcie"; 146 else 147 compat = CONFIG_FSL_PCIE_COMPAT; 148 149 if (compat) 150 nodeoffset = fdt_node_offset_by_compat_reg(blob, 151 compat, pcie->dbi_res.start); 152 #endif 153 if (nodeoffset < 0) 154 return; 155 } 156 157 /* get phandle to iommu controller */ 158 prop = fdt_getprop_w(blob, nodeoffset, "iommu-map", &lenp); 159 if (prop == NULL) { 160 debug("\n%s: ERROR: missing iommu-map: PCIe%d\n", 161 __func__, pcie->idx); 162 return; 163 } 164 165 /* set iommu-map row */ 166 iommu_map[0] = cpu_to_fdt32(devid); 167 iommu_map[1] = *++prop; 168 iommu_map[2] = cpu_to_fdt32(streamid); 169 iommu_map[3] = cpu_to_fdt32(1); 170 171 if (devid == 0) { 172 fdt_setprop_inplace(blob, nodeoffset, "iommu-map", 173 iommu_map, 16); 174 } else { 175 fdt_appendprop(blob, nodeoffset, "iommu-map", iommu_map, 16); 176 } 177 } 178 179 static void fdt_fixup_pcie(void *blob) 180 { 181 struct udevice *dev, *bus; 182 struct ls_pcie *pcie; 183 int streamid; 184 int index; 185 pci_dev_t bdf; 186 187 /* Scan all known buses */ 188 for (pci_find_first_device(&dev); 189 dev; 190 pci_find_next_device(&dev)) { 191 for (bus = dev; device_is_on_pci_bus(bus);) 192 bus = bus->parent; 193 pcie = dev_get_priv(bus); 194 195 streamid = ls_pcie_next_streamid(); 196 if (streamid < 0) { 197 debug("ERROR: no stream ids free\n"); 198 continue; 199 } 200 201 index = ls_pcie_next_lut_index(pcie); 202 if (index < 0) { 203 debug("ERROR: no LUT indexes free\n"); 204 continue; 205 } 206 207 /* the DT fixup must be relative to the hose first_busno */ 208 bdf = dm_pci_get_bdf(dev) - PCI_BDF(bus->seq, 0, 0); 209 /* map PCI b.d.f to streamID in LUT */ 210 ls_pcie_lut_set_mapping(pcie, index, bdf >> 8, 211 streamid); 212 /* update msi-map in device tree */ 213 fdt_pcie_set_msi_map_entry(blob, pcie, bdf >> 8, 214 streamid); 215 /* update iommu-map in device tree */ 216 fdt_pcie_set_iommu_map_entry(blob, pcie, bdf >> 8, 217 streamid); 218 } 219 } 220 #endif 221 222 static void ft_pcie_ls_setup(void *blob, struct ls_pcie *pcie) 223 { 224 int off; 225 uint svr; 226 char *compat = NULL; 227 228 off = fdt_node_offset_by_compat_reg(blob, "fsl,ls-pcie", 229 pcie->dbi_res.start); 230 if (off < 0) { 231 #ifdef CONFIG_FSL_PCIE_COMPAT /* Compatible with older version of dts node */ 232 svr = (get_svr() >> SVR_VAR_PER_SHIFT) & 0xFFFFFE; 233 if (svr == SVR_LS2088A || svr == SVR_LS2084A || 234 svr == SVR_LS2048A || svr == SVR_LS2044A || 235 svr == SVR_LS2081A || svr == SVR_LS2041A) 236 compat = "fsl,ls2088a-pcie"; 237 else 238 compat = CONFIG_FSL_PCIE_COMPAT; 239 if (compat) 240 off = fdt_node_offset_by_compat_reg(blob, 241 compat, pcie->dbi_res.start); 242 #endif 243 if (off < 0) 244 return; 245 } 246 247 if (pcie->enabled) 248 fdt_set_node_status(blob, off, FDT_STATUS_OKAY, 0); 249 else 250 fdt_set_node_status(blob, off, FDT_STATUS_DISABLED, 0); 251 } 252 253 /* Fixup Kernel DT for PCIe */ 254 void ft_pci_setup(void *blob, bd_t *bd) 255 { 256 struct ls_pcie *pcie; 257 258 list_for_each_entry(pcie, &ls_pcie_list, list) 259 ft_pcie_ls_setup(blob, pcie); 260 261 #if defined(CONFIG_FSL_LSCH3) || defined(CONFIG_FSL_LSCH2) 262 fdt_fixup_pcie(blob); 263 #endif 264 } 265 266 #else /* !CONFIG_OF_BOARD_SETUP */ 267 void ft_pci_setup(void *blob, bd_t *bd) 268 { 269 } 270 #endif 271