Xiaowei Bao | 118e58e | 2020-07-09 23:31:33 +0800 | [diff] [blame^] | 1 | // SPDX-License-Identifier: GPL-2.0+ |
| 2 | /* |
| 3 | * Copyright 2020 NXP |
| 4 | * Layerscape PCIe EP driver |
| 5 | */ |
| 6 | |
| 7 | #include <common.h> |
| 8 | #include <dm.h> |
| 9 | #include <dm/devres.h> |
| 10 | #include <errno.h> |
| 11 | #include <pci_ep.h> |
| 12 | #include <asm/io.h> |
| 13 | #include <linux/sizes.h> |
| 14 | #include <linux/log2.h> |
| 15 | #include "pcie_layerscape.h" |
| 16 | |
| 17 | DECLARE_GLOBAL_DATA_PTR; |
| 18 | |
| 19 | static void ls_pcie_ep_enable_cfg(struct ls_pcie_ep *pcie_ep) |
| 20 | { |
| 21 | struct ls_pcie *pcie = pcie_ep->pcie; |
| 22 | u32 config; |
| 23 | |
| 24 | config = ctrl_readl(pcie, PCIE_PF_CONFIG); |
| 25 | config |= PCIE_CONFIG_READY; |
| 26 | ctrl_writel(pcie, config, PCIE_PF_CONFIG); |
| 27 | } |
| 28 | |
| 29 | static int ls_ep_set_bar(struct udevice *dev, uint fn, struct pci_bar *ep_bar) |
| 30 | { |
| 31 | struct ls_pcie_ep *pcie_ep = dev_get_priv(dev); |
| 32 | struct ls_pcie *pcie = pcie_ep->pcie; |
| 33 | dma_addr_t bar_phys = ep_bar->phys_addr; |
| 34 | enum pci_barno bar = ep_bar->barno; |
| 35 | u32 reg = PCI_BASE_ADDRESS_0 + (4 * bar); |
| 36 | int flags = ep_bar->flags; |
| 37 | int type, idx; |
| 38 | u64 size; |
| 39 | |
| 40 | idx = bar; |
| 41 | /* BAR size is 2^(aperture + 11) */ |
| 42 | size = max_t(size_t, ep_bar->size, FSL_PCIE_EP_MIN_APERTURE); |
| 43 | |
| 44 | if (!(flags & PCI_BASE_ADDRESS_SPACE)) |
| 45 | type = PCIE_ATU_TYPE_MEM; |
| 46 | else |
| 47 | type = PCIE_ATU_TYPE_IO; |
| 48 | |
| 49 | ls_pcie_atu_inbound_set(pcie, idx, bar, bar_phys, type); |
| 50 | |
| 51 | dbi_writel(pcie, lower_32_bits(size - 1), reg + PCIE_NO_SRIOV_BAR_BASE); |
| 52 | dbi_writel(pcie, flags, reg); |
| 53 | |
| 54 | if (flags & PCI_BASE_ADDRESS_MEM_TYPE_64) { |
| 55 | dbi_writel(pcie, upper_32_bits(size - 1), |
| 56 | reg + 4 + PCIE_NO_SRIOV_BAR_BASE); |
| 57 | dbi_writel(pcie, 0, reg + 4); |
| 58 | } |
| 59 | |
| 60 | return 0; |
| 61 | } |
| 62 | |
| 63 | static struct pci_ep_ops ls_pcie_ep_ops = { |
| 64 | .set_bar = ls_ep_set_bar, |
| 65 | }; |
| 66 | |
| 67 | static void ls_pcie_ep_setup_atu(struct ls_pcie_ep *pcie_ep) |
| 68 | { |
| 69 | struct ls_pcie *pcie = pcie_ep->pcie; |
| 70 | u64 phys = CONFIG_SYS_PCI_EP_MEMORY_BASE; |
| 71 | |
| 72 | /* ATU 0 : INBOUND : map BAR0 */ |
| 73 | ls_pcie_atu_inbound_set(pcie, 0, PCIE_ATU_TYPE_MEM, 0, phys); |
| 74 | /* ATU 1 : INBOUND : map BAR1 */ |
| 75 | phys += PCIE_BAR1_SIZE; |
| 76 | ls_pcie_atu_inbound_set(pcie, 1, PCIE_ATU_TYPE_MEM, 1, phys); |
| 77 | /* ATU 2 : INBOUND : map BAR2 */ |
| 78 | phys += PCIE_BAR2_SIZE; |
| 79 | ls_pcie_atu_inbound_set(pcie, 2, PCIE_ATU_TYPE_MEM, 2, phys); |
| 80 | /* ATU 3 : INBOUND : map BAR4 */ |
| 81 | phys = CONFIG_SYS_PCI_EP_MEMORY_BASE + PCIE_BAR4_SIZE; |
| 82 | ls_pcie_atu_inbound_set(pcie, 3, PCIE_ATU_TYPE_MEM, 4, phys); |
| 83 | |
| 84 | /* ATU 0 : OUTBOUND : map MEM */ |
| 85 | ls_pcie_atu_outbound_set(pcie, 0, |
| 86 | PCIE_ATU_TYPE_MEM, |
| 87 | pcie_ep->addr_res.start, |
| 88 | 0, |
| 89 | CONFIG_SYS_PCI_MEMORY_SIZE); |
| 90 | } |
| 91 | |
| 92 | /* BAR0 and BAR1 are 32bit BAR2 and BAR4 are 64bit */ |
| 93 | static void ls_pcie_ep_setup_bar(void *bar_base, int bar, u32 size) |
| 94 | { |
| 95 | /* The least inbound window is 4KiB */ |
| 96 | if (size < 4 * 1024) |
| 97 | return; |
| 98 | |
| 99 | switch (bar) { |
| 100 | case 0: |
| 101 | writel(size - 1, bar_base + PCI_BASE_ADDRESS_0); |
| 102 | break; |
| 103 | case 1: |
| 104 | writel(size - 1, bar_base + PCI_BASE_ADDRESS_1); |
| 105 | break; |
| 106 | case 2: |
| 107 | writel(size - 1, bar_base + PCI_BASE_ADDRESS_2); |
| 108 | writel(0, bar_base + PCI_BASE_ADDRESS_3); |
| 109 | break; |
| 110 | case 4: |
| 111 | writel(size - 1, bar_base + PCI_BASE_ADDRESS_4); |
| 112 | writel(0, bar_base + PCI_BASE_ADDRESS_5); |
| 113 | break; |
| 114 | default: |
| 115 | break; |
| 116 | } |
| 117 | } |
| 118 | |
| 119 | static void ls_pcie_ep_setup_bars(void *bar_base) |
| 120 | { |
| 121 | /* BAR0 - 32bit - 4K configuration */ |
| 122 | ls_pcie_ep_setup_bar(bar_base, 0, PCIE_BAR0_SIZE); |
| 123 | /* BAR1 - 32bit - 8K MSIX */ |
| 124 | ls_pcie_ep_setup_bar(bar_base, 1, PCIE_BAR1_SIZE); |
| 125 | /* BAR2 - 64bit - 4K MEM descriptor */ |
| 126 | ls_pcie_ep_setup_bar(bar_base, 2, PCIE_BAR2_SIZE); |
| 127 | /* BAR4 - 64bit - 1M MEM */ |
| 128 | ls_pcie_ep_setup_bar(bar_base, 4, PCIE_BAR4_SIZE); |
| 129 | } |
| 130 | |
| 131 | static void ls_pcie_setup_ep(struct ls_pcie_ep *pcie_ep) |
| 132 | { |
| 133 | u32 sriov; |
| 134 | struct ls_pcie *pcie = pcie_ep->pcie; |
| 135 | |
| 136 | sriov = readl(pcie->dbi + PCIE_SRIOV); |
| 137 | if (PCI_EXT_CAP_ID(sriov) == PCI_EXT_CAP_ID_SRIOV) { |
| 138 | int pf, vf; |
| 139 | |
| 140 | for (pf = 0; pf < PCIE_PF_NUM; pf++) { |
| 141 | for (vf = 0; vf <= PCIE_VF_NUM; vf++) { |
| 142 | ctrl_writel(pcie, PCIE_LCTRL0_VAL(pf, vf), |
| 143 | PCIE_PF_VF_CTRL); |
| 144 | |
| 145 | ls_pcie_ep_setup_bars(pcie->dbi); |
| 146 | ls_pcie_ep_setup_atu(pcie_ep); |
| 147 | } |
| 148 | } |
| 149 | /* Disable CFG2 */ |
| 150 | ctrl_writel(pcie, 0, PCIE_PF_VF_CTRL); |
| 151 | } else { |
| 152 | ls_pcie_ep_setup_bars(pcie->dbi + PCIE_NO_SRIOV_BAR_BASE); |
| 153 | ls_pcie_ep_setup_atu(pcie_ep); |
| 154 | } |
| 155 | |
| 156 | ls_pcie_ep_enable_cfg(pcie_ep); |
| 157 | } |
| 158 | |
| 159 | static int ls_pcie_ep_probe(struct udevice *dev) |
| 160 | { |
| 161 | struct ls_pcie_ep *pcie_ep = dev_get_priv(dev); |
| 162 | struct ls_pcie *pcie; |
| 163 | u16 link_sta; |
| 164 | int ret; |
| 165 | |
| 166 | pcie = devm_kmalloc(dev, sizeof(*pcie), GFP_KERNEL); |
| 167 | if (!pcie) |
| 168 | return -ENOMEM; |
| 169 | |
| 170 | pcie_ep->pcie = pcie; |
| 171 | |
| 172 | pcie->dbi = (void __iomem *)devfdt_get_addr_index(dev, 0); |
| 173 | if (!pcie->dbi) |
| 174 | return -ENOMEM; |
| 175 | |
| 176 | pcie->ctrl = (void __iomem *)devfdt_get_addr_index(dev, 1); |
| 177 | if (!pcie->ctrl) |
| 178 | return -ENOMEM; |
| 179 | |
| 180 | ret = fdt_get_named_resource(gd->fdt_blob, dev_of_offset(dev), |
| 181 | "reg", "reg-names", |
| 182 | "addr_space", &pcie_ep->addr_res); |
| 183 | if (ret) { |
| 184 | printf("%s: resource \"addr_space\" not found\n", dev->name); |
| 185 | return ret; |
| 186 | } |
| 187 | |
| 188 | pcie->idx = ((unsigned long)pcie->dbi - PCIE_SYS_BASE_ADDR) / |
| 189 | PCIE_CCSR_SIZE; |
| 190 | |
| 191 | pcie->big_endian = fdtdec_get_bool(gd->fdt_blob, dev_of_offset(dev), |
| 192 | "big-endian"); |
| 193 | |
| 194 | pcie->mode = readb(pcie->dbi + PCI_HEADER_TYPE) & 0x7f; |
| 195 | if (pcie->mode != PCI_HEADER_TYPE_NORMAL) |
| 196 | return 0; |
| 197 | |
| 198 | pcie_ep->max_functions = fdtdec_get_int(gd->fdt_blob, |
| 199 | dev_of_offset(dev), |
| 200 | "max-functions", 1); |
| 201 | pcie_ep->num_ib_wins = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev), |
| 202 | "num-ib-windows", 8); |
| 203 | pcie_ep->num_ob_wins = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev), |
| 204 | "num-ob-windows", 8); |
| 205 | |
| 206 | printf("PCIe%u: %s %s", pcie->idx, dev->name, "Endpoint"); |
| 207 | ls_pcie_setup_ep(pcie_ep); |
| 208 | |
| 209 | if (!ls_pcie_link_up(pcie)) { |
| 210 | /* Let the user know there's no PCIe link */ |
| 211 | printf(": no link\n"); |
| 212 | return 0; |
| 213 | } |
| 214 | |
| 215 | /* Print the negotiated PCIe link width */ |
| 216 | link_sta = readw(pcie->dbi + PCIE_LINK_STA); |
| 217 | printf(": x%d gen%d\n", (link_sta & PCIE_LINK_WIDTH_MASK) >> 4, |
| 218 | link_sta & PCIE_LINK_SPEED_MASK); |
| 219 | |
| 220 | return 0; |
| 221 | } |
| 222 | |
| 223 | static int ls_pcie_ep_remove(struct udevice *dev) |
| 224 | { |
| 225 | return 0; |
| 226 | } |
| 227 | |
| 228 | const struct udevice_id ls_pcie_ep_ids[] = { |
| 229 | { .compatible = "fsl,ls-pcie-ep" }, |
| 230 | { } |
| 231 | }; |
| 232 | |
| 233 | U_BOOT_DRIVER(pci_layerscape_ep) = { |
| 234 | .name = "pci_layerscape_ep", |
| 235 | .id = UCLASS_PCI_EP, |
| 236 | .of_match = ls_pcie_ep_ids, |
| 237 | .ops = &ls_pcie_ep_ops, |
| 238 | .probe = ls_pcie_ep_probe, |
| 239 | .remove = ls_pcie_ep_remove, |
| 240 | .priv_auto_alloc_size = sizeof(struct ls_pcie_ep), |
| 241 | }; |