diff options
Diffstat (limited to 'drivers/pci/controller/dwc/pcie-designware.c')
| -rw-r--r-- | drivers/pci/controller/dwc/pcie-designware.c | 1206 |
1 files changed, 1009 insertions, 197 deletions
diff --git a/drivers/pci/controller/dwc/pcie-designware.c b/drivers/pci/controller/dwc/pcie-designware.c index 93ef8c31fb39..75fc8b767fcc 100644 --- a/drivers/pci/controller/dwc/pcie-designware.c +++ b/drivers/pci/controller/dwc/pcie-designware.c @@ -3,26 +3,293 @@ * Synopsys DesignWare PCIe host controller driver * * Copyright (C) 2013 Samsung Electronics Co., Ltd. - * http://www.samsung.com + * https://www.samsung.com * * Author: Jingoo Han <jg1.han@samsung.com> */ +#include <linux/align.h> +#include <linux/bitops.h> +#include <linux/clk.h> #include <linux/delay.h> +#include <linux/dma/edma.h> +#include <linux/gpio/consumer.h> +#include <linux/ioport.h> #include <linux/of.h> +#include <linux/of_address.h> +#include <linux/pcie-dwc.h> +#include <linux/platform_device.h> +#include <linux/sizes.h> #include <linux/types.h> +#include "../../pci.h" #include "pcie-designware.h" -/* PCIe Port Logic registers */ -#define PLR_OFFSET 0x700 -#define PCIE_PHY_DEBUG_R1 (PLR_OFFSET + 0x2c) -#define PCIE_PHY_DEBUG_R1_LINK_UP (0x1 << 4) -#define PCIE_PHY_DEBUG_R1_LINK_IN_TRAINING (0x1 << 29) +static const char * const dw_pcie_app_clks[DW_PCIE_NUM_APP_CLKS] = { + [DW_PCIE_DBI_CLK] = "dbi", + [DW_PCIE_MSTR_CLK] = "mstr", + [DW_PCIE_SLV_CLK] = "slv", +}; + +static const char * const dw_pcie_core_clks[DW_PCIE_NUM_CORE_CLKS] = { + [DW_PCIE_PIPE_CLK] = "pipe", + [DW_PCIE_CORE_CLK] = "core", + [DW_PCIE_AUX_CLK] = "aux", + [DW_PCIE_REF_CLK] = "ref", +}; + +static const char * const dw_pcie_app_rsts[DW_PCIE_NUM_APP_RSTS] = { + [DW_PCIE_DBI_RST] = "dbi", + [DW_PCIE_MSTR_RST] = "mstr", + [DW_PCIE_SLV_RST] = "slv", +}; + +static const char * const dw_pcie_core_rsts[DW_PCIE_NUM_CORE_RSTS] = { + [DW_PCIE_NON_STICKY_RST] = "non-sticky", + [DW_PCIE_STICKY_RST] = "sticky", + [DW_PCIE_CORE_RST] = "core", + [DW_PCIE_PIPE_RST] = "pipe", + [DW_PCIE_PHY_RST] = "phy", + [DW_PCIE_HOT_RST] = "hot", + [DW_PCIE_PWR_RST] = "pwr", +}; + +static const struct dwc_pcie_vsec_id dwc_pcie_ptm_vsec_ids[] = { + { .vendor_id = PCI_VENDOR_ID_QCOM, /* EP */ + .vsec_id = 0x03, .vsec_rev = 0x1 }, + { .vendor_id = PCI_VENDOR_ID_QCOM, /* RC */ + .vsec_id = 0x04, .vsec_rev = 0x1 }, + { } +}; + +static int dw_pcie_get_clocks(struct dw_pcie *pci) +{ + int i, ret; + + for (i = 0; i < DW_PCIE_NUM_APP_CLKS; i++) + pci->app_clks[i].id = dw_pcie_app_clks[i]; + + for (i = 0; i < DW_PCIE_NUM_CORE_CLKS; i++) + pci->core_clks[i].id = dw_pcie_core_clks[i]; + + ret = devm_clk_bulk_get_optional(pci->dev, DW_PCIE_NUM_APP_CLKS, + pci->app_clks); + if (ret) + return ret; + + return devm_clk_bulk_get_optional(pci->dev, DW_PCIE_NUM_CORE_CLKS, + pci->core_clks); +} + +static int dw_pcie_get_resets(struct dw_pcie *pci) +{ + int i, ret; + + for (i = 0; i < DW_PCIE_NUM_APP_RSTS; i++) + pci->app_rsts[i].id = dw_pcie_app_rsts[i]; + + for (i = 0; i < DW_PCIE_NUM_CORE_RSTS; i++) + pci->core_rsts[i].id = dw_pcie_core_rsts[i]; + + ret = devm_reset_control_bulk_get_optional_shared(pci->dev, + DW_PCIE_NUM_APP_RSTS, + pci->app_rsts); + if (ret) + return ret; + + ret = devm_reset_control_bulk_get_optional_exclusive(pci->dev, + DW_PCIE_NUM_CORE_RSTS, + pci->core_rsts); + if (ret) + return ret; + + pci->pe_rst = devm_gpiod_get_optional(pci->dev, "reset", GPIOD_OUT_HIGH); + if (IS_ERR(pci->pe_rst)) + return PTR_ERR(pci->pe_rst); + + return 0; +} + +int dw_pcie_get_resources(struct dw_pcie *pci) +{ + struct platform_device *pdev = to_platform_device(pci->dev); + struct device_node *np = dev_of_node(pci->dev); + struct resource *res; + int ret; + + if (!pci->dbi_base) { + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dbi"); + pci->dbi_base = devm_pci_remap_cfg_resource(pci->dev, res); + if (IS_ERR(pci->dbi_base)) + return PTR_ERR(pci->dbi_base); + pci->dbi_phys_addr = res->start; + } + + /* DBI2 is mainly useful for the endpoint controller */ + if (!pci->dbi_base2) { + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dbi2"); + if (res) { + pci->dbi_base2 = devm_pci_remap_cfg_resource(pci->dev, res); + if (IS_ERR(pci->dbi_base2)) + return PTR_ERR(pci->dbi_base2); + } else { + pci->dbi_base2 = pci->dbi_base + SZ_4K; + } + } + + /* For non-unrolled iATU/eDMA platforms this range will be ignored */ + if (!pci->atu_base) { + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "atu"); + if (res) { + pci->atu_size = resource_size(res); + pci->atu_base = devm_ioremap_resource(pci->dev, res); + if (IS_ERR(pci->atu_base)) + return PTR_ERR(pci->atu_base); + pci->atu_phys_addr = res->start; + } else { + pci->atu_base = pci->dbi_base + DEFAULT_DBI_ATU_OFFSET; + } + } + + /* Set a default value suitable for at most 8 in and 8 out windows */ + if (!pci->atu_size) + pci->atu_size = SZ_4K; + + /* eDMA region can be mapped to a custom base address */ + if (!pci->edma.reg_base) { + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dma"); + if (res) { + pci->edma.reg_base = devm_ioremap_resource(pci->dev, res); + if (IS_ERR(pci->edma.reg_base)) + return PTR_ERR(pci->edma.reg_base); + } else if (pci->atu_size >= 2 * DEFAULT_DBI_DMA_OFFSET) { + pci->edma.reg_base = pci->atu_base + DEFAULT_DBI_DMA_OFFSET; + } + } + + /* ELBI is an optional resource */ + if (!pci->elbi_base) { + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "elbi"); + if (res) { + pci->elbi_base = devm_ioremap_resource(pci->dev, res); + if (IS_ERR(pci->elbi_base)) + return PTR_ERR(pci->elbi_base); + } + } + + /* LLDD is supposed to manually switch the clocks and resets state */ + if (dw_pcie_cap_is(pci, REQ_RES)) { + ret = dw_pcie_get_clocks(pci); + if (ret) + return ret; + + ret = dw_pcie_get_resets(pci); + if (ret) + return ret; + } + + if (pci->max_link_speed < 1) + pci->max_link_speed = of_pci_get_max_link_speed(np); + + of_property_read_u32(np, "num-lanes", &pci->num_lanes); + + if (of_property_read_bool(np, "snps,enable-cdm-check")) + dw_pcie_cap_set(pci, CDM_CHECK); + + return 0; +} + +void dw_pcie_version_detect(struct dw_pcie *pci) +{ + u32 ver; + + /* The content of the CSR is zero on DWC PCIe older than v4.70a */ + ver = dw_pcie_readl_dbi(pci, PCIE_VERSION_NUMBER); + if (!ver) + return; + + if (pci->version && pci->version != ver) + dev_warn(pci->dev, "Versions don't match (%08x != %08x)\n", + pci->version, ver); + else + pci->version = ver; + + ver = dw_pcie_readl_dbi(pci, PCIE_VERSION_TYPE); + + if (pci->type && pci->type != ver) + dev_warn(pci->dev, "Types don't match (%08x != %08x)\n", + pci->type, ver); + else + pci->type = ver; +} + +u8 dw_pcie_find_capability(struct dw_pcie *pci, u8 cap) +{ + return PCI_FIND_NEXT_CAP(dw_pcie_read_cfg, PCI_CAPABILITY_LIST, cap, + pci); +} +EXPORT_SYMBOL_GPL(dw_pcie_find_capability); + +u16 dw_pcie_find_ext_capability(struct dw_pcie *pci, u8 cap) +{ + return PCI_FIND_NEXT_EXT_CAP(dw_pcie_read_cfg, 0, cap, pci); +} +EXPORT_SYMBOL_GPL(dw_pcie_find_ext_capability); + +static u16 __dw_pcie_find_vsec_capability(struct dw_pcie *pci, u16 vendor_id, + u16 vsec_id) +{ + u16 vsec = 0; + u32 header; + + if (vendor_id != dw_pcie_readw_dbi(pci, PCI_VENDOR_ID)) + return 0; + + while ((vsec = PCI_FIND_NEXT_EXT_CAP(dw_pcie_read_cfg, vsec, + PCI_EXT_CAP_ID_VNDR, pci))) { + header = dw_pcie_readl_dbi(pci, vsec + PCI_VNDR_HEADER); + if (PCI_VNDR_HEADER_ID(header) == vsec_id) + return vsec; + } + + return 0; +} + +static u16 dw_pcie_find_vsec_capability(struct dw_pcie *pci, + const struct dwc_pcie_vsec_id *vsec_ids) +{ + const struct dwc_pcie_vsec_id *vid; + u16 vsec; + u32 header; + + for (vid = vsec_ids; vid->vendor_id; vid++) { + vsec = __dw_pcie_find_vsec_capability(pci, vid->vendor_id, + vid->vsec_id); + if (vsec) { + header = dw_pcie_readl_dbi(pci, vsec + PCI_VNDR_HEADER); + if (PCI_VNDR_HEADER_REV(header) == vid->vsec_rev) + return vsec; + } + } + + return 0; +} + +u16 dw_pcie_find_rasdes_capability(struct dw_pcie *pci) +{ + return dw_pcie_find_vsec_capability(pci, dwc_pcie_rasdes_vsec_ids); +} +EXPORT_SYMBOL_GPL(dw_pcie_find_rasdes_capability); + +u16 dw_pcie_find_ptm_capability(struct dw_pcie *pci) +{ + return dw_pcie_find_vsec_capability(pci, dwc_pcie_ptm_vsec_ids); +} +EXPORT_SYMBOL_GPL(dw_pcie_find_ptm_capability); int dw_pcie_read(void __iomem *addr, int size, u32 *val) { - if ((uintptr_t)addr & (size - 1)) { + if (!IS_ALIGNED((uintptr_t)addr, size)) { *val = 0; return PCIBIOS_BAD_REGISTER_NUMBER; } @@ -40,10 +307,11 @@ int dw_pcie_read(void __iomem *addr, int size, u32 *val) return PCIBIOS_SUCCESSFUL; } +EXPORT_SYMBOL_GPL(dw_pcie_read); int dw_pcie_write(void __iomem *addr, int size, u32 val) { - if ((uintptr_t)addr & (size - 1)) + if (!IS_ALIGNED((uintptr_t)addr, size)) return PCIBIOS_BAD_REGISTER_NUMBER; if (size == 4) @@ -57,338 +325,882 @@ int dw_pcie_write(void __iomem *addr, int size, u32 val) return PCIBIOS_SUCCESSFUL; } +EXPORT_SYMBOL_GPL(dw_pcie_write); -u32 __dw_pcie_read_dbi(struct dw_pcie *pci, void __iomem *base, u32 reg, - size_t size) +u32 dw_pcie_read_dbi(struct dw_pcie *pci, u32 reg, size_t size) { int ret; u32 val; - if (pci->ops->read_dbi) - return pci->ops->read_dbi(pci, base, reg, size); + if (pci->ops && pci->ops->read_dbi) + return pci->ops->read_dbi(pci, pci->dbi_base, reg, size); - ret = dw_pcie_read(base + reg, size, &val); + ret = dw_pcie_read(pci->dbi_base + reg, size, &val); if (ret) dev_err(pci->dev, "Read DBI address failed\n"); return val; } +EXPORT_SYMBOL_GPL(dw_pcie_read_dbi); -void __dw_pcie_write_dbi(struct dw_pcie *pci, void __iomem *base, u32 reg, - size_t size, u32 val) +void dw_pcie_write_dbi(struct dw_pcie *pci, u32 reg, size_t size, u32 val) { int ret; - if (pci->ops->write_dbi) { - pci->ops->write_dbi(pci, base, reg, size, val); + if (pci->ops && pci->ops->write_dbi) { + pci->ops->write_dbi(pci, pci->dbi_base, reg, size, val); return; } - ret = dw_pcie_write(base + reg, size, val); + ret = dw_pcie_write(pci->dbi_base + reg, size, val); if (ret) dev_err(pci->dev, "Write DBI address failed\n"); } +EXPORT_SYMBOL_GPL(dw_pcie_write_dbi); -static u32 dw_pcie_readl_ob_unroll(struct dw_pcie *pci, u32 index, u32 reg) +void dw_pcie_write_dbi2(struct dw_pcie *pci, u32 reg, size_t size, u32 val) { - u32 offset = PCIE_GET_ATU_OUTB_UNR_REG_OFFSET(index); + int ret; + + if (pci->ops && pci->ops->write_dbi2) { + pci->ops->write_dbi2(pci, pci->dbi_base2, reg, size, val); + return; + } - return dw_pcie_readl_atu(pci, offset + reg); + ret = dw_pcie_write(pci->dbi_base2 + reg, size, val); + if (ret) + dev_err(pci->dev, "write DBI address failed\n"); } +EXPORT_SYMBOL_GPL(dw_pcie_write_dbi2); -static void dw_pcie_writel_ob_unroll(struct dw_pcie *pci, u32 index, u32 reg, - u32 val) +static inline void __iomem *dw_pcie_select_atu(struct dw_pcie *pci, u32 dir, + u32 index) { - u32 offset = PCIE_GET_ATU_OUTB_UNR_REG_OFFSET(index); + if (dw_pcie_cap_is(pci, IATU_UNROLL)) + return pci->atu_base + PCIE_ATU_UNROLL_BASE(dir, index); - dw_pcie_writel_atu(pci, offset + reg, val); + dw_pcie_writel_dbi(pci, PCIE_ATU_VIEWPORT, dir | index); + return pci->atu_base; } -static void dw_pcie_prog_outbound_atu_unroll(struct dw_pcie *pci, int index, - int type, u64 cpu_addr, - u64 pci_addr, u32 size) +static u32 dw_pcie_readl_atu(struct dw_pcie *pci, u32 dir, u32 index, u32 reg) { - u32 retries, val; + void __iomem *base; + int ret; + u32 val; + + base = dw_pcie_select_atu(pci, dir, index); + + if (pci->ops && pci->ops->read_dbi) + return pci->ops->read_dbi(pci, base, reg, 4); - dw_pcie_writel_ob_unroll(pci, index, PCIE_ATU_UNR_LOWER_BASE, - lower_32_bits(cpu_addr)); - dw_pcie_writel_ob_unroll(pci, index, PCIE_ATU_UNR_UPPER_BASE, - upper_32_bits(cpu_addr)); - dw_pcie_writel_ob_unroll(pci, index, PCIE_ATU_UNR_LIMIT, - lower_32_bits(cpu_addr + size - 1)); - dw_pcie_writel_ob_unroll(pci, index, PCIE_ATU_UNR_LOWER_TARGET, - lower_32_bits(pci_addr)); - dw_pcie_writel_ob_unroll(pci, index, PCIE_ATU_UNR_UPPER_TARGET, - upper_32_bits(pci_addr)); - dw_pcie_writel_ob_unroll(pci, index, PCIE_ATU_UNR_REGION_CTRL1, - type); - dw_pcie_writel_ob_unroll(pci, index, PCIE_ATU_UNR_REGION_CTRL2, - PCIE_ATU_ENABLE); + ret = dw_pcie_read(base + reg, 4, &val); + if (ret) + dev_err(pci->dev, "Read ATU address failed\n"); + + return val; +} + +static void dw_pcie_writel_atu(struct dw_pcie *pci, u32 dir, u32 index, + u32 reg, u32 val) +{ + void __iomem *base; + int ret; + + base = dw_pcie_select_atu(pci, dir, index); + + if (pci->ops && pci->ops->write_dbi) { + pci->ops->write_dbi(pci, base, reg, 4, val); + return; + } + + ret = dw_pcie_write(base + reg, 4, val); + if (ret) + dev_err(pci->dev, "Write ATU address failed\n"); +} + +static inline u32 dw_pcie_readl_atu_ob(struct dw_pcie *pci, u32 index, u32 reg) +{ + return dw_pcie_readl_atu(pci, PCIE_ATU_REGION_DIR_OB, index, reg); +} + +static inline void dw_pcie_writel_atu_ob(struct dw_pcie *pci, u32 index, u32 reg, + u32 val) +{ + dw_pcie_writel_atu(pci, PCIE_ATU_REGION_DIR_OB, index, reg, val); +} +static inline u32 dw_pcie_enable_ecrc(u32 val) +{ /* - * Make sure ATU enable takes effect before any subsequent config - * and I/O accesses. + * DesignWare core version 4.90A has a design issue where the 'TD' + * bit in the Control register-1 of the ATU outbound region acts + * like an override for the ECRC setting, i.e., the presence of TLP + * Digest (ECRC) in the outgoing TLPs is solely determined by this + * bit. This is contrary to the PCIe spec which says that the + * enablement of the ECRC is solely determined by the AER + * registers. + * + * Because of this, even when the ECRC is enabled through AER + * registers, the transactions going through ATU won't have TLP + * Digest as there is no way the PCI core AER code could program + * the TD bit which is specific to the DesignWare core. + * + * The best way to handle this scenario is to program the TD bit + * always. It affects only the traffic from root port to downstream + * devices. + * + * At this point, + * When ECRC is enabled in AER registers, everything works normally + * When ECRC is NOT enabled in AER registers, then, + * on Root Port:- TLP Digest (DWord size) gets appended to each packet + * even through it is not required. Since downstream + * TLPs are mostly for configuration accesses and BAR + * accesses, they are not in critical path and won't + * have much negative effect on the performance. + * on End Point:- TLP Digest is received for some/all the packets coming + * from the root port. TLP Digest is ignored because, + * as per the PCIe Spec r5.0 v1.0 section 2.2.3 + * "TLP Digest Rules", when an endpoint receives TLP + * Digest when its ECRC check functionality is disabled + * in AER registers, received TLP Digest is just ignored. + * Since there is no issue or error reported either side, best way to + * handle the scenario is to program TD bit by default. */ - for (retries = 0; retries < LINK_WAIT_MAX_IATU_RETRIES; retries++) { - val = dw_pcie_readl_ob_unroll(pci, index, - PCIE_ATU_UNR_REGION_CTRL2); - if (val & PCIE_ATU_ENABLE) - return; - mdelay(LINK_WAIT_IATU); - } - dev_err(pci->dev, "Outbound iATU is not being enabled\n"); + return val | PCIE_ATU_TD; } -void dw_pcie_prog_outbound_atu(struct dw_pcie *pci, int index, int type, - u64 cpu_addr, u64 pci_addr, u32 size) +int dw_pcie_prog_outbound_atu(struct dw_pcie *pci, + const struct dw_pcie_ob_atu_cfg *atu) { + u64 parent_bus_addr = atu->parent_bus_addr; u32 retries, val; + u64 limit_addr; - if (pci->ops->cpu_addr_fixup) - cpu_addr = pci->ops->cpu_addr_fixup(pci, cpu_addr); + limit_addr = parent_bus_addr + atu->size - 1; - if (pci->iatu_unroll_enabled) { - dw_pcie_prog_outbound_atu_unroll(pci, index, type, cpu_addr, - pci_addr, size); - return; + if ((limit_addr & ~pci->region_limit) != (parent_bus_addr & ~pci->region_limit) || + !IS_ALIGNED(parent_bus_addr, pci->region_align) || + !IS_ALIGNED(atu->pci_addr, pci->region_align) || !atu->size) { + return -EINVAL; } - dw_pcie_writel_dbi(pci, PCIE_ATU_VIEWPORT, - PCIE_ATU_REGION_OUTBOUND | index); - dw_pcie_writel_dbi(pci, PCIE_ATU_LOWER_BASE, - lower_32_bits(cpu_addr)); - dw_pcie_writel_dbi(pci, PCIE_ATU_UPPER_BASE, - upper_32_bits(cpu_addr)); - dw_pcie_writel_dbi(pci, PCIE_ATU_LIMIT, - lower_32_bits(cpu_addr + size - 1)); - dw_pcie_writel_dbi(pci, PCIE_ATU_LOWER_TARGET, - lower_32_bits(pci_addr)); - dw_pcie_writel_dbi(pci, PCIE_ATU_UPPER_TARGET, - upper_32_bits(pci_addr)); - dw_pcie_writel_dbi(pci, PCIE_ATU_CR1, type); - dw_pcie_writel_dbi(pci, PCIE_ATU_CR2, PCIE_ATU_ENABLE); + dw_pcie_writel_atu_ob(pci, atu->index, PCIE_ATU_LOWER_BASE, + lower_32_bits(parent_bus_addr)); + dw_pcie_writel_atu_ob(pci, atu->index, PCIE_ATU_UPPER_BASE, + upper_32_bits(parent_bus_addr)); + + dw_pcie_writel_atu_ob(pci, atu->index, PCIE_ATU_LIMIT, + lower_32_bits(limit_addr)); + if (dw_pcie_ver_is_ge(pci, 460A)) + dw_pcie_writel_atu_ob(pci, atu->index, PCIE_ATU_UPPER_LIMIT, + upper_32_bits(limit_addr)); + + dw_pcie_writel_atu_ob(pci, atu->index, PCIE_ATU_LOWER_TARGET, + lower_32_bits(atu->pci_addr)); + dw_pcie_writel_atu_ob(pci, atu->index, PCIE_ATU_UPPER_TARGET, + upper_32_bits(atu->pci_addr)); + + val = atu->type | atu->routing | PCIE_ATU_FUNC_NUM(atu->func_no); + if (upper_32_bits(limit_addr) > upper_32_bits(parent_bus_addr) && + dw_pcie_ver_is_ge(pci, 460A)) + val |= PCIE_ATU_INCREASE_REGION_SIZE; + if (dw_pcie_ver_is(pci, 490A)) + val = dw_pcie_enable_ecrc(val); + dw_pcie_writel_atu_ob(pci, atu->index, PCIE_ATU_REGION_CTRL1, val); + + val = PCIE_ATU_ENABLE | atu->ctrl2; + if (atu->type == PCIE_ATU_TYPE_MSG) { + /* The data-less messages only for now */ + val |= PCIE_ATU_INHIBIT_PAYLOAD | atu->code; + } + dw_pcie_writel_atu_ob(pci, atu->index, PCIE_ATU_REGION_CTRL2, val); /* * Make sure ATU enable takes effect before any subsequent config * and I/O accesses. */ for (retries = 0; retries < LINK_WAIT_MAX_IATU_RETRIES; retries++) { - val = dw_pcie_readl_dbi(pci, PCIE_ATU_CR2); + val = dw_pcie_readl_atu_ob(pci, atu->index, PCIE_ATU_REGION_CTRL2); if (val & PCIE_ATU_ENABLE) - return; + return 0; mdelay(LINK_WAIT_IATU); } + dev_err(pci->dev, "Outbound iATU is not being enabled\n"); + + return -ETIMEDOUT; } -static u32 dw_pcie_readl_ib_unroll(struct dw_pcie *pci, u32 index, u32 reg) +static inline u32 dw_pcie_readl_atu_ib(struct dw_pcie *pci, u32 index, u32 reg) { - u32 offset = PCIE_GET_ATU_INB_UNR_REG_OFFSET(index); - - return dw_pcie_readl_atu(pci, offset + reg); + return dw_pcie_readl_atu(pci, PCIE_ATU_REGION_DIR_IB, index, reg); } -static void dw_pcie_writel_ib_unroll(struct dw_pcie *pci, u32 index, u32 reg, - u32 val) +static inline void dw_pcie_writel_atu_ib(struct dw_pcie *pci, u32 index, u32 reg, + u32 val) { - u32 offset = PCIE_GET_ATU_INB_UNR_REG_OFFSET(index); - - dw_pcie_writel_atu(pci, offset + reg, val); + dw_pcie_writel_atu(pci, PCIE_ATU_REGION_DIR_IB, index, reg, val); } -static int dw_pcie_prog_inbound_atu_unroll(struct dw_pcie *pci, int index, - int bar, u64 cpu_addr, - enum dw_pcie_as_type as_type) +int dw_pcie_prog_inbound_atu(struct dw_pcie *pci, int index, int type, + u64 parent_bus_addr, u64 pci_addr, u64 size) { - int type; + u64 limit_addr = pci_addr + size - 1; u32 retries, val; - dw_pcie_writel_ib_unroll(pci, index, PCIE_ATU_UNR_LOWER_TARGET, - lower_32_bits(cpu_addr)); - dw_pcie_writel_ib_unroll(pci, index, PCIE_ATU_UNR_UPPER_TARGET, - upper_32_bits(cpu_addr)); - - switch (as_type) { - case DW_PCIE_AS_MEM: - type = PCIE_ATU_TYPE_MEM; - break; - case DW_PCIE_AS_IO: - type = PCIE_ATU_TYPE_IO; - break; - default: + if ((limit_addr & ~pci->region_limit) != (pci_addr & ~pci->region_limit) || + !IS_ALIGNED(parent_bus_addr, pci->region_align) || + !IS_ALIGNED(pci_addr, pci->region_align) || !size) { return -EINVAL; } - dw_pcie_writel_ib_unroll(pci, index, PCIE_ATU_UNR_REGION_CTRL1, type); - dw_pcie_writel_ib_unroll(pci, index, PCIE_ATU_UNR_REGION_CTRL2, - PCIE_ATU_ENABLE | - PCIE_ATU_BAR_MODE_ENABLE | (bar << 8)); + dw_pcie_writel_atu_ib(pci, index, PCIE_ATU_LOWER_BASE, + lower_32_bits(pci_addr)); + dw_pcie_writel_atu_ib(pci, index, PCIE_ATU_UPPER_BASE, + upper_32_bits(pci_addr)); + + dw_pcie_writel_atu_ib(pci, index, PCIE_ATU_LIMIT, + lower_32_bits(limit_addr)); + if (dw_pcie_ver_is_ge(pci, 460A)) + dw_pcie_writel_atu_ib(pci, index, PCIE_ATU_UPPER_LIMIT, + upper_32_bits(limit_addr)); + + dw_pcie_writel_atu_ib(pci, index, PCIE_ATU_LOWER_TARGET, + lower_32_bits(parent_bus_addr)); + dw_pcie_writel_atu_ib(pci, index, PCIE_ATU_UPPER_TARGET, + upper_32_bits(parent_bus_addr)); + + val = type; + if (upper_32_bits(limit_addr) > upper_32_bits(pci_addr) && + dw_pcie_ver_is_ge(pci, 460A)) + val |= PCIE_ATU_INCREASE_REGION_SIZE; + dw_pcie_writel_atu_ib(pci, index, PCIE_ATU_REGION_CTRL1, val); + dw_pcie_writel_atu_ib(pci, index, PCIE_ATU_REGION_CTRL2, PCIE_ATU_ENABLE); /* * Make sure ATU enable takes effect before any subsequent config * and I/O accesses. */ for (retries = 0; retries < LINK_WAIT_MAX_IATU_RETRIES; retries++) { - val = dw_pcie_readl_ib_unroll(pci, index, - PCIE_ATU_UNR_REGION_CTRL2); + val = dw_pcie_readl_atu_ib(pci, index, PCIE_ATU_REGION_CTRL2); if (val & PCIE_ATU_ENABLE) return 0; mdelay(LINK_WAIT_IATU); } + dev_err(pci->dev, "Inbound iATU is not being enabled\n"); - return -EBUSY; + return -ETIMEDOUT; } -int dw_pcie_prog_inbound_atu(struct dw_pcie *pci, int index, int bar, - u64 cpu_addr, enum dw_pcie_as_type as_type) +int dw_pcie_prog_ep_inbound_atu(struct dw_pcie *pci, u8 func_no, int index, + int type, u64 parent_bus_addr, u8 bar, size_t size) { - int type; u32 retries, val; - if (pci->iatu_unroll_enabled) - return dw_pcie_prog_inbound_atu_unroll(pci, index, bar, - cpu_addr, as_type); - - dw_pcie_writel_dbi(pci, PCIE_ATU_VIEWPORT, PCIE_ATU_REGION_INBOUND | - index); - dw_pcie_writel_dbi(pci, PCIE_ATU_LOWER_TARGET, lower_32_bits(cpu_addr)); - dw_pcie_writel_dbi(pci, PCIE_ATU_UPPER_TARGET, upper_32_bits(cpu_addr)); - - switch (as_type) { - case DW_PCIE_AS_MEM: - type = PCIE_ATU_TYPE_MEM; - break; - case DW_PCIE_AS_IO: - type = PCIE_ATU_TYPE_IO; - break; - default: + if (!IS_ALIGNED(parent_bus_addr, pci->region_align) || + !IS_ALIGNED(parent_bus_addr, size)) return -EINVAL; - } - dw_pcie_writel_dbi(pci, PCIE_ATU_CR1, type); - dw_pcie_writel_dbi(pci, PCIE_ATU_CR2, PCIE_ATU_ENABLE - | PCIE_ATU_BAR_MODE_ENABLE | (bar << 8)); + dw_pcie_writel_atu_ib(pci, index, PCIE_ATU_LOWER_TARGET, + lower_32_bits(parent_bus_addr)); + dw_pcie_writel_atu_ib(pci, index, PCIE_ATU_UPPER_TARGET, + upper_32_bits(parent_bus_addr)); + + dw_pcie_writel_atu_ib(pci, index, PCIE_ATU_REGION_CTRL1, type | + PCIE_ATU_FUNC_NUM(func_no)); + dw_pcie_writel_atu_ib(pci, index, PCIE_ATU_REGION_CTRL2, + PCIE_ATU_ENABLE | PCIE_ATU_FUNC_NUM_MATCH_EN | + PCIE_ATU_BAR_MODE_ENABLE | (bar << 8)); /* * Make sure ATU enable takes effect before any subsequent config * and I/O accesses. */ for (retries = 0; retries < LINK_WAIT_MAX_IATU_RETRIES; retries++) { - val = dw_pcie_readl_dbi(pci, PCIE_ATU_CR2); + val = dw_pcie_readl_atu_ib(pci, index, PCIE_ATU_REGION_CTRL2); if (val & PCIE_ATU_ENABLE) return 0; mdelay(LINK_WAIT_IATU); } + dev_err(pci->dev, "Inbound iATU is not being enabled\n"); - return -EBUSY; + return -ETIMEDOUT; } -void dw_pcie_disable_atu(struct dw_pcie *pci, int index, - enum dw_pcie_region_type type) +void dw_pcie_disable_atu(struct dw_pcie *pci, u32 dir, int index) { - int region; - - switch (type) { - case DW_PCIE_REGION_INBOUND: - region = PCIE_ATU_REGION_INBOUND; - break; - case DW_PCIE_REGION_OUTBOUND: - region = PCIE_ATU_REGION_OUTBOUND; - break; - default: - return; - } - - dw_pcie_writel_dbi(pci, PCIE_ATU_VIEWPORT, region | index); - dw_pcie_writel_dbi(pci, PCIE_ATU_CR2, ~PCIE_ATU_ENABLE); + dw_pcie_writel_atu(pci, dir, index, PCIE_ATU_REGION_CTRL2, 0); } int dw_pcie_wait_for_link(struct dw_pcie *pci) { + u32 offset, val; int retries; /* Check if the link is up or not */ - for (retries = 0; retries < LINK_WAIT_MAX_RETRIES; retries++) { - if (dw_pcie_link_up(pci)) { - dev_info(pci->dev, "Link up\n"); - return 0; - } - usleep_range(LINK_WAIT_USLEEP_MIN, LINK_WAIT_USLEEP_MAX); + for (retries = 0; retries < PCIE_LINK_WAIT_MAX_RETRIES; retries++) { + if (dw_pcie_link_up(pci)) + break; + + msleep(PCIE_LINK_WAIT_SLEEP_MS); } - dev_err(pci->dev, "Phy link never came up\n"); + if (retries >= PCIE_LINK_WAIT_MAX_RETRIES) { + dev_info(pci->dev, "Phy link never came up\n"); + return -ETIMEDOUT; + } - return -ETIMEDOUT; + /* + * As per PCIe r6.0, sec 6.6.1, a Downstream Port that supports Link + * speeds greater than 5.0 GT/s, software must wait a minimum of 100 ms + * after Link training completes before sending a Configuration Request. + */ + if (pci->max_link_speed > 2) + msleep(PCIE_RESET_CONFIG_WAIT_MS); + + offset = dw_pcie_find_capability(pci, PCI_CAP_ID_EXP); + val = dw_pcie_readw_dbi(pci, offset + PCI_EXP_LNKSTA); + + dev_info(pci->dev, "PCIe Gen.%u x%u link up\n", + FIELD_GET(PCI_EXP_LNKSTA_CLS, val), + FIELD_GET(PCI_EXP_LNKSTA_NLW, val)); + + return 0; } +EXPORT_SYMBOL_GPL(dw_pcie_wait_for_link); -int dw_pcie_link_up(struct dw_pcie *pci) +bool dw_pcie_link_up(struct dw_pcie *pci) { u32 val; - if (pci->ops->link_up) + if (pci->ops && pci->ops->link_up) return pci->ops->link_up(pci); - val = readl(pci->dbi_base + PCIE_PHY_DEBUG_R1); - return ((val & PCIE_PHY_DEBUG_R1_LINK_UP) && - (!(val & PCIE_PHY_DEBUG_R1_LINK_IN_TRAINING))); + val = dw_pcie_readl_dbi(pci, PCIE_PORT_DEBUG1); + return ((val & PCIE_PORT_DEBUG1_LINK_UP) && + (!(val & PCIE_PORT_DEBUG1_LINK_IN_TRAINING))); } +EXPORT_SYMBOL_GPL(dw_pcie_link_up); -void dw_pcie_setup(struct dw_pcie *pci) +void dw_pcie_upconfig_setup(struct dw_pcie *pci) { - int ret; u32 val; - u32 lanes; - struct device *dev = pci->dev; - struct device_node *np = dev->of_node; - ret = of_property_read_u32(np, "num-lanes", &lanes); - if (ret) - lanes = 0; + val = dw_pcie_readl_dbi(pci, PCIE_PORT_MULTI_LANE_CTRL); + val |= PORT_MLTI_UPCFG_SUPPORT; + dw_pcie_writel_dbi(pci, PCIE_PORT_MULTI_LANE_CTRL, val); +} +EXPORT_SYMBOL_GPL(dw_pcie_upconfig_setup); - /* Set the number of lanes */ - val = dw_pcie_readl_dbi(pci, PCIE_PORT_LINK_CONTROL); - val &= ~PORT_LINK_MODE_MASK; - switch (lanes) { - case 1: - val |= PORT_LINK_MODE_1_LANES; +static void dw_pcie_link_set_max_speed(struct dw_pcie *pci) +{ + u32 cap, ctrl2, link_speed; + u8 offset = dw_pcie_find_capability(pci, PCI_CAP_ID_EXP); + + cap = dw_pcie_readl_dbi(pci, offset + PCI_EXP_LNKCAP); + + /* + * Even if the platform doesn't want to limit the maximum link speed, + * just cache the hardware default value so that the vendor drivers can + * use it to do any link specific configuration. + */ + if (pci->max_link_speed < 1) { + pci->max_link_speed = FIELD_GET(PCI_EXP_LNKCAP_SLS, cap); + return; + } + + ctrl2 = dw_pcie_readl_dbi(pci, offset + PCI_EXP_LNKCTL2); + ctrl2 &= ~PCI_EXP_LNKCTL2_TLS; + + switch (pcie_link_speed[pci->max_link_speed]) { + case PCIE_SPEED_2_5GT: + link_speed = PCI_EXP_LNKCTL2_TLS_2_5GT; break; - case 2: - val |= PORT_LINK_MODE_2_LANES; + case PCIE_SPEED_5_0GT: + link_speed = PCI_EXP_LNKCTL2_TLS_5_0GT; break; - case 4: - val |= PORT_LINK_MODE_4_LANES; + case PCIE_SPEED_8_0GT: + link_speed = PCI_EXP_LNKCTL2_TLS_8_0GT; break; - case 8: - val |= PORT_LINK_MODE_8_LANES; + case PCIE_SPEED_16_0GT: + link_speed = PCI_EXP_LNKCTL2_TLS_16_0GT; break; default: - dev_err(pci->dev, "num-lanes %u: invalid value\n", lanes); - return; + /* Use hardware capability */ + link_speed = FIELD_GET(PCI_EXP_LNKCAP_SLS, cap); + ctrl2 &= ~PCI_EXP_LNKCTL2_HASD; + break; } - dw_pcie_writel_dbi(pci, PCIE_PORT_LINK_CONTROL, val); + + dw_pcie_writel_dbi(pci, offset + PCI_EXP_LNKCTL2, ctrl2 | link_speed); + + cap &= ~((u32)PCI_EXP_LNKCAP_SLS); + dw_pcie_writel_dbi(pci, offset + PCI_EXP_LNKCAP, cap | link_speed); + +} + +int dw_pcie_link_get_max_link_width(struct dw_pcie *pci) +{ + u8 cap = dw_pcie_find_capability(pci, PCI_CAP_ID_EXP); + u32 lnkcap = dw_pcie_readl_dbi(pci, cap + PCI_EXP_LNKCAP); + + return FIELD_GET(PCI_EXP_LNKCAP_MLW, lnkcap); +} + +static void dw_pcie_link_set_max_link_width(struct dw_pcie *pci, u32 num_lanes) +{ + u32 lnkcap, lwsc, plc; + u8 cap; + + if (!num_lanes) + return; + + /* Set the number of lanes */ + plc = dw_pcie_readl_dbi(pci, PCIE_PORT_LINK_CONTROL); + plc &= ~PORT_LINK_FAST_LINK_MODE; + plc &= ~PORT_LINK_MODE_MASK; /* Set link width speed control register */ - val = dw_pcie_readl_dbi(pci, PCIE_LINK_WIDTH_SPEED_CONTROL); - val &= ~PORT_LOGIC_LINK_WIDTH_MASK; - switch (lanes) { + lwsc = dw_pcie_readl_dbi(pci, PCIE_LINK_WIDTH_SPEED_CONTROL); + lwsc &= ~PORT_LOGIC_LINK_WIDTH_MASK; + lwsc |= PORT_LOGIC_LINK_WIDTH_1_LANES; + switch (num_lanes) { case 1: - val |= PORT_LOGIC_LINK_WIDTH_1_LANES; + plc |= PORT_LINK_MODE_1_LANES; break; case 2: - val |= PORT_LOGIC_LINK_WIDTH_2_LANES; + plc |= PORT_LINK_MODE_2_LANES; break; case 4: - val |= PORT_LOGIC_LINK_WIDTH_4_LANES; + plc |= PORT_LINK_MODE_4_LANES; break; case 8: - val |= PORT_LOGIC_LINK_WIDTH_8_LANES; + plc |= PORT_LINK_MODE_8_LANES; + break; + case 16: + plc |= PORT_LINK_MODE_16_LANES; break; + default: + dev_err(pci->dev, "num-lanes %u: invalid value\n", num_lanes); + return; + } + dw_pcie_writel_dbi(pci, PCIE_PORT_LINK_CONTROL, plc); + dw_pcie_writel_dbi(pci, PCIE_LINK_WIDTH_SPEED_CONTROL, lwsc); + + cap = dw_pcie_find_capability(pci, PCI_CAP_ID_EXP); + lnkcap = dw_pcie_readl_dbi(pci, cap + PCI_EXP_LNKCAP); + lnkcap &= ~PCI_EXP_LNKCAP_MLW; + lnkcap |= FIELD_PREP(PCI_EXP_LNKCAP_MLW, num_lanes); + dw_pcie_writel_dbi(pci, cap + PCI_EXP_LNKCAP, lnkcap); +} + +void dw_pcie_iatu_detect(struct dw_pcie *pci) +{ + int max_region, ob, ib; + u32 val, min, dir; + u64 max; + + val = dw_pcie_readl_dbi(pci, PCIE_ATU_VIEWPORT); + if (val == 0xFFFFFFFF) { + dw_pcie_cap_set(pci, IATU_UNROLL); + + max_region = min((int)pci->atu_size / 512, 256); + } else { + pci->atu_base = pci->dbi_base + PCIE_ATU_VIEWPORT_BASE; + pci->atu_size = PCIE_ATU_VIEWPORT_SIZE; + + dw_pcie_writel_dbi(pci, PCIE_ATU_VIEWPORT, 0xFF); + max_region = dw_pcie_readl_dbi(pci, PCIE_ATU_VIEWPORT) + 1; + } + + for (ob = 0; ob < max_region; ob++) { + dw_pcie_writel_atu_ob(pci, ob, PCIE_ATU_LOWER_TARGET, 0x11110000); + val = dw_pcie_readl_atu_ob(pci, ob, PCIE_ATU_LOWER_TARGET); + if (val != 0x11110000) + break; + } + + for (ib = 0; ib < max_region; ib++) { + dw_pcie_writel_atu_ib(pci, ib, PCIE_ATU_LOWER_TARGET, 0x11110000); + val = dw_pcie_readl_atu_ib(pci, ib, PCIE_ATU_LOWER_TARGET); + if (val != 0x11110000) + break; + } + + if (ob) { + dir = PCIE_ATU_REGION_DIR_OB; + } else if (ib) { + dir = PCIE_ATU_REGION_DIR_IB; + } else { + dev_err(pci->dev, "No iATU regions found\n"); + return; + } + + dw_pcie_writel_atu(pci, dir, 0, PCIE_ATU_LIMIT, 0x0); + min = dw_pcie_readl_atu(pci, dir, 0, PCIE_ATU_LIMIT); + + if (dw_pcie_ver_is_ge(pci, 460A)) { + dw_pcie_writel_atu(pci, dir, 0, PCIE_ATU_UPPER_LIMIT, 0xFFFFFFFF); + max = dw_pcie_readl_atu(pci, dir, 0, PCIE_ATU_UPPER_LIMIT); + } else { + max = 0; } - dw_pcie_writel_dbi(pci, PCIE_LINK_WIDTH_SPEED_CONTROL, val); + + pci->num_ob_windows = ob; + pci->num_ib_windows = ib; + pci->region_align = 1 << fls(min); + pci->region_limit = (max << 32) | (SZ_4G - 1); + + dev_info(pci->dev, "iATU: unroll %s, %u ob, %u ib, align %uK, limit %lluG\n", + dw_pcie_cap_is(pci, IATU_UNROLL) ? "T" : "F", + pci->num_ob_windows, pci->num_ib_windows, + pci->region_align / SZ_1K, (pci->region_limit + 1) / SZ_1G); +} + +static u32 dw_pcie_readl_dma(struct dw_pcie *pci, u32 reg) +{ + u32 val = 0; + int ret; + + if (pci->ops && pci->ops->read_dbi) + return pci->ops->read_dbi(pci, pci->edma.reg_base, reg, 4); + + ret = dw_pcie_read(pci->edma.reg_base + reg, 4, &val); + if (ret) + dev_err(pci->dev, "Read DMA address failed\n"); + + return val; +} + +static int dw_pcie_edma_irq_vector(struct device *dev, unsigned int nr) +{ + struct platform_device *pdev = to_platform_device(dev); + char name[6]; + int ret; + + if (nr >= EDMA_MAX_WR_CH + EDMA_MAX_RD_CH) + return -EINVAL; + + ret = platform_get_irq_byname_optional(pdev, "dma"); + if (ret > 0) + return ret; + + snprintf(name, sizeof(name), "dma%u", nr); + + return platform_get_irq_byname_optional(pdev, name); +} + +static struct dw_edma_plat_ops dw_pcie_edma_ops = { + .irq_vector = dw_pcie_edma_irq_vector, +}; + +static void dw_pcie_edma_init_data(struct dw_pcie *pci) +{ + pci->edma.dev = pci->dev; + + if (!pci->edma.ops) + pci->edma.ops = &dw_pcie_edma_ops; + + pci->edma.flags |= DW_EDMA_CHIP_LOCAL; +} + +static int dw_pcie_edma_find_mf(struct dw_pcie *pci) +{ + u32 val; + + /* + * Bail out finding the mapping format if it is already set by the glue + * driver. Also ensure that the edma.reg_base is pointing to a valid + * memory region. + */ + if (pci->edma.mf != EDMA_MF_EDMA_LEGACY) + return pci->edma.reg_base ? 0 : -ENODEV; + + /* + * Indirect eDMA CSRs access has been completely removed since v5.40a + * thus no space is now reserved for the eDMA channels viewport and + * former DMA CTRL register is no longer fixed to FFs. + */ + if (dw_pcie_ver_is_ge(pci, 540A)) + val = 0xFFFFFFFF; + else + val = dw_pcie_readl_dbi(pci, PCIE_DMA_VIEWPORT_BASE + PCIE_DMA_CTRL); + + if (val == 0xFFFFFFFF && pci->edma.reg_base) { + pci->edma.mf = EDMA_MF_EDMA_UNROLL; + } else if (val != 0xFFFFFFFF) { + pci->edma.mf = EDMA_MF_EDMA_LEGACY; + + pci->edma.reg_base = pci->dbi_base + PCIE_DMA_VIEWPORT_BASE; + } else { + return -ENODEV; + } + + return 0; +} + +static int dw_pcie_edma_find_channels(struct dw_pcie *pci) +{ + u32 val; + + /* + * Autodetect the read/write channels count only for non-HDMA platforms. + * HDMA platforms with native CSR mapping doesn't support autodetect, + * so the glue drivers should've passed the valid count already. If not, + * the below sanity check will catch it. + */ + if (pci->edma.mf != EDMA_MF_HDMA_NATIVE) { + val = dw_pcie_readl_dma(pci, PCIE_DMA_CTRL); + + pci->edma.ll_wr_cnt = FIELD_GET(PCIE_DMA_NUM_WR_CHAN, val); + pci->edma.ll_rd_cnt = FIELD_GET(PCIE_DMA_NUM_RD_CHAN, val); + } + + /* Sanity check the channels count if the mapping was incorrect */ + if (!pci->edma.ll_wr_cnt || pci->edma.ll_wr_cnt > EDMA_MAX_WR_CH || + !pci->edma.ll_rd_cnt || pci->edma.ll_rd_cnt > EDMA_MAX_RD_CH) + return -EINVAL; + + return 0; +} + +static int dw_pcie_edma_find_chip(struct dw_pcie *pci) +{ + int ret; + + dw_pcie_edma_init_data(pci); + + ret = dw_pcie_edma_find_mf(pci); + if (ret) + return ret; + + return dw_pcie_edma_find_channels(pci); +} + +static int dw_pcie_edma_irq_verify(struct dw_pcie *pci) +{ + struct platform_device *pdev = to_platform_device(pci->dev); + u16 ch_cnt = pci->edma.ll_wr_cnt + pci->edma.ll_rd_cnt; + char name[15]; + int ret; + + if (pci->edma.nr_irqs > 1) + return pci->edma.nr_irqs != ch_cnt ? -EINVAL : 0; + + ret = platform_get_irq_byname_optional(pdev, "dma"); + if (ret > 0) { + pci->edma.nr_irqs = 1; + return 0; + } + + for (; pci->edma.nr_irqs < ch_cnt; pci->edma.nr_irqs++) { + snprintf(name, sizeof(name), "dma%d", pci->edma.nr_irqs); + + ret = platform_get_irq_byname_optional(pdev, name); + if (ret <= 0) + return -EINVAL; + } + + return 0; +} + +static int dw_pcie_edma_ll_alloc(struct dw_pcie *pci) +{ + struct dw_edma_region *ll; + dma_addr_t paddr; + int i; + + for (i = 0; i < pci->edma.ll_wr_cnt; i++) { + ll = &pci->edma.ll_region_wr[i]; + ll->sz = DMA_LLP_MEM_SIZE; + ll->vaddr.mem = dmam_alloc_coherent(pci->dev, ll->sz, + &paddr, GFP_KERNEL); + if (!ll->vaddr.mem) + return -ENOMEM; + + ll->paddr = paddr; + } + + for (i = 0; i < pci->edma.ll_rd_cnt; i++) { + ll = &pci->edma.ll_region_rd[i]; + ll->sz = DMA_LLP_MEM_SIZE; + ll->vaddr.mem = dmam_alloc_coherent(pci->dev, ll->sz, + &paddr, GFP_KERNEL); + if (!ll->vaddr.mem) + return -ENOMEM; + + ll->paddr = paddr; + } + + return 0; +} + +int dw_pcie_edma_detect(struct dw_pcie *pci) +{ + int ret; + + /* Don't fail if no eDMA was found (for the backward compatibility) */ + ret = dw_pcie_edma_find_chip(pci); + if (ret) + return 0; + + /* Don't fail on the IRQs verification (for the backward compatibility) */ + ret = dw_pcie_edma_irq_verify(pci); + if (ret) { + dev_err(pci->dev, "Invalid eDMA IRQs found\n"); + return 0; + } + + ret = dw_pcie_edma_ll_alloc(pci); + if (ret) { + dev_err(pci->dev, "Couldn't allocate LLP memory\n"); + return ret; + } + + /* Don't fail if the DW eDMA driver can't find the device */ + ret = dw_edma_probe(&pci->edma); + if (ret && ret != -ENODEV) { + dev_err(pci->dev, "Couldn't register eDMA device\n"); + return ret; + } + + dev_info(pci->dev, "eDMA: unroll %s, %hu wr, %hu rd\n", + pci->edma.mf == EDMA_MF_EDMA_UNROLL ? "T" : "F", + pci->edma.ll_wr_cnt, pci->edma.ll_rd_cnt); + + return 0; +} + +void dw_pcie_edma_remove(struct dw_pcie *pci) +{ + dw_edma_remove(&pci->edma); +} + +void dw_pcie_hide_unsupported_l1ss(struct dw_pcie *pci) +{ + u16 l1ss; + u32 l1ss_cap; + + if (pci->l1ss_support) + return; + + l1ss = dw_pcie_find_ext_capability(pci, PCI_EXT_CAP_ID_L1SS); + if (!l1ss) + return; + + /* + * Unless the driver claims "l1ss_support", don't advertise L1 PM + * Substates because they require CLKREQ# and possibly other + * device-specific configuration. + */ + l1ss_cap = dw_pcie_readl_dbi(pci, l1ss + PCI_L1SS_CAP); + l1ss_cap &= ~(PCI_L1SS_CAP_PCIPM_L1_1 | PCI_L1SS_CAP_ASPM_L1_1 | + PCI_L1SS_CAP_PCIPM_L1_2 | PCI_L1SS_CAP_ASPM_L1_2 | + PCI_L1SS_CAP_L1_PM_SS); + dw_pcie_writel_dbi(pci, l1ss + PCI_L1SS_CAP, l1ss_cap); +} + +void dw_pcie_setup(struct dw_pcie *pci) +{ + u32 val; + + dw_pcie_link_set_max_speed(pci); + + /* Configure Gen1 N_FTS */ + if (pci->n_fts[0]) { + val = dw_pcie_readl_dbi(pci, PCIE_PORT_AFR); + val &= ~(PORT_AFR_N_FTS_MASK | PORT_AFR_CC_N_FTS_MASK); + val |= PORT_AFR_N_FTS(pci->n_fts[0]); + val |= PORT_AFR_CC_N_FTS(pci->n_fts[0]); + dw_pcie_writel_dbi(pci, PCIE_PORT_AFR, val); + } + + /* Configure Gen2+ N_FTS */ + if (pci->n_fts[1]) { + val = dw_pcie_readl_dbi(pci, PCIE_LINK_WIDTH_SPEED_CONTROL); + val &= ~PORT_LOGIC_N_FTS_MASK; + val |= pci->n_fts[1]; + dw_pcie_writel_dbi(pci, PCIE_LINK_WIDTH_SPEED_CONTROL, val); + } + + if (dw_pcie_cap_is(pci, CDM_CHECK)) { + val = dw_pcie_readl_dbi(pci, PCIE_PL_CHK_REG_CONTROL_STATUS); + val |= PCIE_PL_CHK_REG_CHK_REG_CONTINUOUS | + PCIE_PL_CHK_REG_CHK_REG_START; + dw_pcie_writel_dbi(pci, PCIE_PL_CHK_REG_CONTROL_STATUS, val); + } + + val = dw_pcie_readl_dbi(pci, PCIE_PORT_LINK_CONTROL); + val &= ~PORT_LINK_FAST_LINK_MODE; + val |= PORT_LINK_DLL_LINK_EN; + dw_pcie_writel_dbi(pci, PCIE_PORT_LINK_CONTROL, val); + + dw_pcie_link_set_max_link_width(pci, pci->num_lanes); +} + +resource_size_t dw_pcie_parent_bus_offset(struct dw_pcie *pci, + const char *reg_name, + resource_size_t cpu_phys_addr) +{ + struct device *dev = pci->dev; + struct device_node *np = dev->of_node; + int index; + u64 reg_addr, fixup_addr; + u64 (*fixup)(struct dw_pcie *pcie, u64 cpu_addr); + + /* Look up reg_name address on parent bus */ + index = of_property_match_string(np, "reg-names", reg_name); + + if (index < 0) { + dev_err(dev, "No %s in devicetree \"reg\" property\n", reg_name); + return 0; + } + + of_property_read_reg(np, index, ®_addr, NULL); + + fixup = pci->ops ? pci->ops->cpu_addr_fixup : NULL; + if (fixup) { + fixup_addr = fixup(pci, cpu_phys_addr); + if (reg_addr == fixup_addr) { + dev_info(dev, "%s reg[%d] %#010llx == %#010llx == fixup(cpu %#010llx); %ps is redundant with this devicetree\n", + reg_name, index, reg_addr, fixup_addr, + (unsigned long long) cpu_phys_addr, fixup); + } else { + dev_warn(dev, "%s reg[%d] %#010llx != %#010llx == fixup(cpu %#010llx); devicetree is broken\n", + reg_name, index, reg_addr, fixup_addr, + (unsigned long long) cpu_phys_addr); + reg_addr = fixup_addr; + } + + return cpu_phys_addr - reg_addr; + } + + if (pci->use_parent_dt_ranges) { + + /* + * This platform once had a fixup, presumably because it + * translates between CPU and PCI controller addresses. + * Log a note if devicetree didn't describe a translation. + */ + if (reg_addr == cpu_phys_addr) + dev_info(dev, "%s reg[%d] %#010llx == cpu %#010llx\n; no fixup was ever needed for this devicetree\n", + reg_name, index, reg_addr, + (unsigned long long) cpu_phys_addr); + } else { + if (reg_addr != cpu_phys_addr) { + dev_warn(dev, "%s reg[%d] %#010llx != cpu %#010llx; no fixup and devicetree \"ranges\" is broken, assuming no translation\n", + reg_name, index, reg_addr, + (unsigned long long) cpu_phys_addr); + return 0; + } + } + + return cpu_phys_addr - reg_addr; } |