diff options
Diffstat (limited to 'drivers/pci/pcie_layerscape_ep.c')
| -rw-r--r-- | drivers/pci/pcie_layerscape_ep.c | 241 |
1 files changed, 241 insertions, 0 deletions
diff --git a/drivers/pci/pcie_layerscape_ep.c b/drivers/pci/pcie_layerscape_ep.c new file mode 100644 index 0000000000..b463a7734a --- /dev/null +++ b/drivers/pci/pcie_layerscape_ep.c @@ -0,0 +1,241 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Copyright 2020 NXP + * Layerscape PCIe EP driver + */ + +#include <common.h> +#include <dm.h> +#include <dm/devres.h> +#include <errno.h> +#include <pci_ep.h> +#include <asm/io.h> +#include <linux/sizes.h> +#include <linux/log2.h> +#include "pcie_layerscape.h" + +DECLARE_GLOBAL_DATA_PTR; + +static void ls_pcie_ep_enable_cfg(struct ls_pcie_ep *pcie_ep) +{ + struct ls_pcie *pcie = pcie_ep->pcie; + u32 config; + + config = ctrl_readl(pcie, PCIE_PF_CONFIG); + config |= PCIE_CONFIG_READY; + ctrl_writel(pcie, config, PCIE_PF_CONFIG); +} + +static int ls_ep_set_bar(struct udevice *dev, uint fn, struct pci_bar *ep_bar) +{ + struct ls_pcie_ep *pcie_ep = dev_get_priv(dev); + struct ls_pcie *pcie = pcie_ep->pcie; + dma_addr_t bar_phys = ep_bar->phys_addr; + enum pci_barno bar = ep_bar->barno; + u32 reg = PCI_BASE_ADDRESS_0 + (4 * bar); + int flags = ep_bar->flags; + int type, idx; + u64 size; + + idx = bar; + /* BAR size is 2^(aperture + 11) */ + size = max_t(size_t, ep_bar->size, FSL_PCIE_EP_MIN_APERTURE); + + if (!(flags & PCI_BASE_ADDRESS_SPACE)) + type = PCIE_ATU_TYPE_MEM; + else + type = PCIE_ATU_TYPE_IO; + + ls_pcie_atu_inbound_set(pcie, idx, bar, bar_phys, type); + + dbi_writel(pcie, lower_32_bits(size - 1), reg + PCIE_NO_SRIOV_BAR_BASE); + dbi_writel(pcie, flags, reg); + + if (flags & PCI_BASE_ADDRESS_MEM_TYPE_64) { + dbi_writel(pcie, upper_32_bits(size - 1), + reg + 4 + PCIE_NO_SRIOV_BAR_BASE); + dbi_writel(pcie, 0, reg + 4); + } + + return 0; +} + +static struct pci_ep_ops ls_pcie_ep_ops = { + .set_bar = ls_ep_set_bar, +}; + +static void ls_pcie_ep_setup_atu(struct ls_pcie_ep *pcie_ep) +{ + struct ls_pcie *pcie = pcie_ep->pcie; + u64 phys = CONFIG_SYS_PCI_EP_MEMORY_BASE; + + /* ATU 0 : INBOUND : map BAR0 */ + ls_pcie_atu_inbound_set(pcie, 0, PCIE_ATU_TYPE_MEM, 0, phys); + /* ATU 1 : INBOUND : map BAR1 */ + phys += PCIE_BAR1_SIZE; + ls_pcie_atu_inbound_set(pcie, 1, PCIE_ATU_TYPE_MEM, 1, phys); + /* ATU 2 : INBOUND : map BAR2 */ + phys += PCIE_BAR2_SIZE; + ls_pcie_atu_inbound_set(pcie, 2, PCIE_ATU_TYPE_MEM, 2, phys); + /* ATU 3 : INBOUND : map BAR4 */ + phys = CONFIG_SYS_PCI_EP_MEMORY_BASE + PCIE_BAR4_SIZE; + ls_pcie_atu_inbound_set(pcie, 3, PCIE_ATU_TYPE_MEM, 4, phys); + + /* ATU 0 : OUTBOUND : map MEM */ + ls_pcie_atu_outbound_set(pcie, 0, + PCIE_ATU_TYPE_MEM, + pcie_ep->addr_res.start, + 0, + CONFIG_SYS_PCI_MEMORY_SIZE); +} + +/* BAR0 and BAR1 are 32bit BAR2 and BAR4 are 64bit */ +static void ls_pcie_ep_setup_bar(void *bar_base, int bar, u32 size) +{ + /* The least inbound window is 4KiB */ + if (size < 4 * 1024) + return; + + switch (bar) { + case 0: + writel(size - 1, bar_base + PCI_BASE_ADDRESS_0); + break; + case 1: + writel(size - 1, bar_base + PCI_BASE_ADDRESS_1); + break; + case 2: + writel(size - 1, bar_base + PCI_BASE_ADDRESS_2); + writel(0, bar_base + PCI_BASE_ADDRESS_3); + break; + case 4: + writel(size - 1, bar_base + PCI_BASE_ADDRESS_4); + writel(0, bar_base + PCI_BASE_ADDRESS_5); + break; + default: + break; + } +} + +static void ls_pcie_ep_setup_bars(void *bar_base) +{ + /* BAR0 - 32bit - 4K configuration */ + ls_pcie_ep_setup_bar(bar_base, 0, PCIE_BAR0_SIZE); + /* BAR1 - 32bit - 8K MSIX */ + ls_pcie_ep_setup_bar(bar_base, 1, PCIE_BAR1_SIZE); + /* BAR2 - 64bit - 4K MEM descriptor */ + ls_pcie_ep_setup_bar(bar_base, 2, PCIE_BAR2_SIZE); + /* BAR4 - 64bit - 1M MEM */ + ls_pcie_ep_setup_bar(bar_base, 4, PCIE_BAR4_SIZE); +} + +static void ls_pcie_setup_ep(struct ls_pcie_ep *pcie_ep) +{ + u32 sriov; + struct ls_pcie *pcie = pcie_ep->pcie; + + sriov = readl(pcie->dbi + PCIE_SRIOV); + if (PCI_EXT_CAP_ID(sriov) == PCI_EXT_CAP_ID_SRIOV) { + int pf, vf; + + for (pf = 0; pf < PCIE_PF_NUM; pf++) { + for (vf = 0; vf <= PCIE_VF_NUM; vf++) { + ctrl_writel(pcie, PCIE_LCTRL0_VAL(pf, vf), + PCIE_PF_VF_CTRL); + + ls_pcie_ep_setup_bars(pcie->dbi); + ls_pcie_ep_setup_atu(pcie_ep); + } + } + /* Disable CFG2 */ + ctrl_writel(pcie, 0, PCIE_PF_VF_CTRL); + } else { + ls_pcie_ep_setup_bars(pcie->dbi + PCIE_NO_SRIOV_BAR_BASE); + ls_pcie_ep_setup_atu(pcie_ep); + } + + ls_pcie_ep_enable_cfg(pcie_ep); +} + +static int ls_pcie_ep_probe(struct udevice *dev) +{ + struct ls_pcie_ep *pcie_ep = dev_get_priv(dev); + struct ls_pcie *pcie; + u16 link_sta; + int ret; + + pcie = devm_kmalloc(dev, sizeof(*pcie), GFP_KERNEL); + if (!pcie) + return -ENOMEM; + + pcie_ep->pcie = pcie; + + pcie->dbi = (void __iomem *)devfdt_get_addr_index(dev, 0); + if (!pcie->dbi) + return -ENOMEM; + + pcie->ctrl = (void __iomem *)devfdt_get_addr_index(dev, 1); + if (!pcie->ctrl) + return -ENOMEM; + + ret = fdt_get_named_resource(gd->fdt_blob, dev_of_offset(dev), + "reg", "reg-names", + "addr_space", &pcie_ep->addr_res); + if (ret) { + printf("%s: resource \"addr_space\" not found\n", dev->name); + return ret; + } + + pcie->idx = ((unsigned long)pcie->dbi - PCIE_SYS_BASE_ADDR) / + PCIE_CCSR_SIZE; + + pcie->big_endian = fdtdec_get_bool(gd->fdt_blob, dev_of_offset(dev), + "big-endian"); + + pcie->mode = readb(pcie->dbi + PCI_HEADER_TYPE) & 0x7f; + if (pcie->mode != PCI_HEADER_TYPE_NORMAL) + return 0; + + pcie_ep->max_functions = fdtdec_get_int(gd->fdt_blob, + dev_of_offset(dev), + "max-functions", 1); + pcie_ep->num_ib_wins = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev), + "num-ib-windows", 8); + pcie_ep->num_ob_wins = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev), + "num-ob-windows", 8); + + printf("PCIe%u: %s %s", pcie->idx, dev->name, "Endpoint"); + ls_pcie_setup_ep(pcie_ep); + + if (!ls_pcie_link_up(pcie)) { + /* Let the user know there's no PCIe link */ + printf(": no link\n"); + return 0; + } + + /* Print the negotiated PCIe link width */ + link_sta = readw(pcie->dbi + PCIE_LINK_STA); + printf(": x%d gen%d\n", (link_sta & PCIE_LINK_WIDTH_MASK) >> 4, + link_sta & PCIE_LINK_SPEED_MASK); + + return 0; +} + +static int ls_pcie_ep_remove(struct udevice *dev) +{ + return 0; +} + +const struct udevice_id ls_pcie_ep_ids[] = { + { .compatible = "fsl,ls-pcie-ep" }, + { } +}; + +U_BOOT_DRIVER(pci_layerscape_ep) = { + .name = "pci_layerscape_ep", + .id = UCLASS_PCI_EP, + .of_match = ls_pcie_ep_ids, + .ops = &ls_pcie_ep_ops, + .probe = ls_pcie_ep_probe, + .remove = ls_pcie_ep_remove, + .priv_auto_alloc_size = sizeof(struct ls_pcie_ep), +}; |