diff options
Diffstat (limited to '')
| -rw-r--r-- | drivers/pci/controller/dwc/pcie-designware.c | 1064 |
1 files changed, 1064 insertions, 0 deletions
diff --git a/drivers/pci/controller/dwc/pcie-designware.c b/drivers/pci/controller/dwc/pcie-designware.c new file mode 100644 index 0000000000..2b60d20dfd --- /dev/null +++ b/drivers/pci/controller/dwc/pcie-designware.c @@ -0,0 +1,1064 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Synopsys DesignWare PCIe host controller driver + * + * Copyright (C) 2013 Samsung Electronics Co., Ltd. + * 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/platform_device.h> +#include <linux/sizes.h> +#include <linux/types.h> + +#include "../../pci.h" +#include "pcie-designware.h" + +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 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); + } + + /* 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); + } 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; + } + } + + /* 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->link_gen < 1) + pci->link_gen = 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; +} + +/* + * These interfaces resemble the pci_find_*capability() interfaces, but these + * are for configuring host controllers, which are bridges *to* PCI devices but + * are not PCI devices themselves. + */ +static u8 __dw_pcie_find_next_cap(struct dw_pcie *pci, u8 cap_ptr, + u8 cap) +{ + u8 cap_id, next_cap_ptr; + u16 reg; + + if (!cap_ptr) + return 0; + + reg = dw_pcie_readw_dbi(pci, cap_ptr); + cap_id = (reg & 0x00ff); + + if (cap_id > PCI_CAP_ID_MAX) + return 0; + + if (cap_id == cap) + return cap_ptr; + + next_cap_ptr = (reg & 0xff00) >> 8; + return __dw_pcie_find_next_cap(pci, next_cap_ptr, cap); +} + +u8 dw_pcie_find_capability(struct dw_pcie *pci, u8 cap) +{ + u8 next_cap_ptr; + u16 reg; + + reg = dw_pcie_readw_dbi(pci, PCI_CAPABILITY_LIST); + next_cap_ptr = (reg & 0x00ff); + + return __dw_pcie_find_next_cap(pci, next_cap_ptr, cap); +} +EXPORT_SYMBOL_GPL(dw_pcie_find_capability); + +static u16 dw_pcie_find_next_ext_capability(struct dw_pcie *pci, u16 start, + u8 cap) +{ + u32 header; + int ttl; + int pos = PCI_CFG_SPACE_SIZE; + + /* minimum 8 bytes per capability */ + ttl = (PCI_CFG_SPACE_EXP_SIZE - PCI_CFG_SPACE_SIZE) / 8; + + if (start) + pos = start; + + header = dw_pcie_readl_dbi(pci, pos); + /* + * If we have no capabilities, this is indicated by cap ID, + * cap version and next pointer all being 0. + */ + if (header == 0) + return 0; + + while (ttl-- > 0) { + if (PCI_EXT_CAP_ID(header) == cap && pos != start) + return pos; + + pos = PCI_EXT_CAP_NEXT(header); + if (pos < PCI_CFG_SPACE_SIZE) + break; + + header = dw_pcie_readl_dbi(pci, pos); + } + + return 0; +} + +u16 dw_pcie_find_ext_capability(struct dw_pcie *pci, u8 cap) +{ + return dw_pcie_find_next_ext_capability(pci, 0, cap); +} +EXPORT_SYMBOL_GPL(dw_pcie_find_ext_capability); + +int dw_pcie_read(void __iomem *addr, int size, u32 *val) +{ + if (!IS_ALIGNED((uintptr_t)addr, size)) { + *val = 0; + return PCIBIOS_BAD_REGISTER_NUMBER; + } + + if (size == 4) { + *val = readl(addr); + } else if (size == 2) { + *val = readw(addr); + } else if (size == 1) { + *val = readb(addr); + } else { + *val = 0; + return PCIBIOS_BAD_REGISTER_NUMBER; + } + + return PCIBIOS_SUCCESSFUL; +} +EXPORT_SYMBOL_GPL(dw_pcie_read); + +int dw_pcie_write(void __iomem *addr, int size, u32 val) +{ + if (!IS_ALIGNED((uintptr_t)addr, size)) + return PCIBIOS_BAD_REGISTER_NUMBER; + + if (size == 4) + writel(val, addr); + else if (size == 2) + writew(val, addr); + else if (size == 1) + writeb(val, addr); + else + return PCIBIOS_BAD_REGISTER_NUMBER; + + return PCIBIOS_SUCCESSFUL; +} +EXPORT_SYMBOL_GPL(dw_pcie_write); + +u32 dw_pcie_read_dbi(struct dw_pcie *pci, u32 reg, size_t size) +{ + int ret; + u32 val; + + if (pci->ops && pci->ops->read_dbi) + return pci->ops->read_dbi(pci, pci->dbi_base, reg, size); + + 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, u32 reg, size_t size, u32 val) +{ + int ret; + + if (pci->ops && pci->ops->write_dbi) { + pci->ops->write_dbi(pci, pci->dbi_base, reg, size, val); + return; + } + + 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); + +void dw_pcie_write_dbi2(struct dw_pcie *pci, u32 reg, size_t size, u32 val) +{ + int ret; + + if (pci->ops && pci->ops->write_dbi2) { + pci->ops->write_dbi2(pci, pci->dbi_base2, reg, size, val); + return; + } + + ret = dw_pcie_write(pci->dbi_base2 + reg, size, val); + if (ret) + dev_err(pci->dev, "write DBI address failed\n"); +} + +static inline void __iomem *dw_pcie_select_atu(struct dw_pcie *pci, u32 dir, + u32 index) +{ + if (dw_pcie_cap_is(pci, IATU_UNROLL)) + return pci->atu_base + PCIE_ATU_UNROLL_BASE(dir, index); + + dw_pcie_writel_dbi(pci, PCIE_ATU_VIEWPORT, dir | index); + return pci->atu_base; +} + +static u32 dw_pcie_readl_atu(struct dw_pcie *pci, u32 dir, u32 index, u32 reg) +{ + 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); + + 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) +{ + /* + * 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. + */ + + return val | PCIE_ATU_TD; +} + +static int __dw_pcie_prog_outbound_atu(struct dw_pcie *pci, u8 func_no, + int index, int type, u64 cpu_addr, + u64 pci_addr, u64 size) +{ + u32 retries, val; + u64 limit_addr; + + if (pci->ops && pci->ops->cpu_addr_fixup) + cpu_addr = pci->ops->cpu_addr_fixup(pci, cpu_addr); + + limit_addr = cpu_addr + size - 1; + + if ((limit_addr & ~pci->region_limit) != (cpu_addr & ~pci->region_limit) || + !IS_ALIGNED(cpu_addr, pci->region_align) || + !IS_ALIGNED(pci_addr, pci->region_align) || !size) { + return -EINVAL; + } + + dw_pcie_writel_atu_ob(pci, index, PCIE_ATU_LOWER_BASE, + lower_32_bits(cpu_addr)); + dw_pcie_writel_atu_ob(pci, index, PCIE_ATU_UPPER_BASE, + upper_32_bits(cpu_addr)); + + dw_pcie_writel_atu_ob(pci, index, PCIE_ATU_LIMIT, + lower_32_bits(limit_addr)); + if (dw_pcie_ver_is_ge(pci, 460A)) + dw_pcie_writel_atu_ob(pci, index, PCIE_ATU_UPPER_LIMIT, + upper_32_bits(limit_addr)); + + dw_pcie_writel_atu_ob(pci, index, PCIE_ATU_LOWER_TARGET, + lower_32_bits(pci_addr)); + dw_pcie_writel_atu_ob(pci, index, PCIE_ATU_UPPER_TARGET, + upper_32_bits(pci_addr)); + + val = type | PCIE_ATU_FUNC_NUM(func_no); + if (upper_32_bits(limit_addr) > upper_32_bits(cpu_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, index, PCIE_ATU_REGION_CTRL1, val); + + dw_pcie_writel_atu_ob(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_atu_ob(pci, index, PCIE_ATU_REGION_CTRL2); + if (val & PCIE_ATU_ENABLE) + return 0; + + mdelay(LINK_WAIT_IATU); + } + + dev_err(pci->dev, "Outbound iATU is not being enabled\n"); + + return -ETIMEDOUT; +} + +int dw_pcie_prog_outbound_atu(struct dw_pcie *pci, int index, int type, + u64 cpu_addr, u64 pci_addr, u64 size) +{ + return __dw_pcie_prog_outbound_atu(pci, 0, index, type, + cpu_addr, pci_addr, size); +} + +int dw_pcie_prog_ep_outbound_atu(struct dw_pcie *pci, u8 func_no, int index, + int type, u64 cpu_addr, u64 pci_addr, + u64 size) +{ + return __dw_pcie_prog_outbound_atu(pci, func_no, index, type, + cpu_addr, pci_addr, size); +} + +static inline u32 dw_pcie_readl_atu_ib(struct dw_pcie *pci, u32 index, u32 reg) +{ + return dw_pcie_readl_atu(pci, PCIE_ATU_REGION_DIR_IB, index, reg); +} + +static inline void dw_pcie_writel_atu_ib(struct dw_pcie *pci, u32 index, u32 reg, + u32 val) +{ + dw_pcie_writel_atu(pci, PCIE_ATU_REGION_DIR_IB, index, reg, val); +} + +int dw_pcie_prog_inbound_atu(struct dw_pcie *pci, int index, int type, + u64 cpu_addr, u64 pci_addr, u64 size) +{ + u64 limit_addr = pci_addr + size - 1; + u32 retries, val; + + if ((limit_addr & ~pci->region_limit) != (pci_addr & ~pci->region_limit) || + !IS_ALIGNED(cpu_addr, pci->region_align) || + !IS_ALIGNED(pci_addr, pci->region_align) || !size) { + return -EINVAL; + } + + 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(cpu_addr)); + dw_pcie_writel_atu_ib(pci, index, PCIE_ATU_UPPER_TARGET, + upper_32_bits(cpu_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_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 -ETIMEDOUT; +} + +int dw_pcie_prog_ep_inbound_atu(struct dw_pcie *pci, u8 func_no, int index, + int type, u64 cpu_addr, u8 bar) +{ + u32 retries, val; + + if (!IS_ALIGNED(cpu_addr, pci->region_align)) + return -EINVAL; + + dw_pcie_writel_atu_ib(pci, index, PCIE_ATU_LOWER_TARGET, + lower_32_bits(cpu_addr)); + dw_pcie_writel_atu_ib(pci, index, PCIE_ATU_UPPER_TARGET, + upper_32_bits(cpu_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_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 -ETIMEDOUT; +} + +void dw_pcie_disable_atu(struct dw_pcie *pci, u32 dir, int index) +{ + 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)) + break; + + usleep_range(LINK_WAIT_USLEEP_MIN, LINK_WAIT_USLEEP_MAX); + } + + if (retries >= LINK_WAIT_MAX_RETRIES) { + dev_info(pci->dev, "Phy link never came up\n"); + return -ETIMEDOUT; + } + + 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) +{ + u32 val; + + if (pci->ops && pci->ops->link_up) + return pci->ops->link_up(pci); + + 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_upconfig_setup(struct dw_pcie *pci) +{ + u32 val; + + 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); + +static void dw_pcie_link_set_max_speed(struct dw_pcie *pci, u32 link_gen) +{ + 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); + ctrl2 = dw_pcie_readl_dbi(pci, offset + PCI_EXP_LNKCTL2); + ctrl2 &= ~PCI_EXP_LNKCTL2_TLS; + + switch (pcie_link_speed[link_gen]) { + case PCIE_SPEED_2_5GT: + link_speed = PCI_EXP_LNKCTL2_TLS_2_5GT; + break; + case PCIE_SPEED_5_0GT: + link_speed = PCI_EXP_LNKCTL2_TLS_5_0GT; + break; + case PCIE_SPEED_8_0GT: + link_speed = PCI_EXP_LNKCTL2_TLS_8_0GT; + break; + case PCIE_SPEED_16_0GT: + link_speed = PCI_EXP_LNKCTL2_TLS_16_0GT; + break; + default: + /* Use hardware capability */ + link_speed = FIELD_GET(PCI_EXP_LNKCAP_SLS, cap); + ctrl2 &= ~PCI_EXP_LNKCTL2_HASD; + break; + } + + 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); + +} + +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 */ + lwsc = dw_pcie_readl_dbi(pci, PCIE_LINK_WIDTH_SPEED_CONTROL); + lwsc &= ~PORT_LOGIC_LINK_WIDTH_MASK; + switch (num_lanes) { + case 1: + plc |= PORT_LINK_MODE_1_LANES; + lwsc |= PORT_LOGIC_LINK_WIDTH_1_LANES; + break; + case 2: + plc |= PORT_LINK_MODE_2_LANES; + lwsc |= PORT_LOGIC_LINK_WIDTH_2_LANES; + break; + case 4: + plc |= PORT_LINK_MODE_4_LANES; + lwsc |= PORT_LOGIC_LINK_WIDTH_4_LANES; + break; + case 8: + plc |= PORT_LINK_MODE_8_LANES; + lwsc |= PORT_LOGIC_LINK_WIDTH_8_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; + } + + 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 int dw_pcie_edma_find_chip(struct dw_pcie *pci) +{ + u32 val; + + /* + * 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; + + val = dw_pcie_readl_dma(pci, PCIE_DMA_CTRL); + } 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; + } + + pci->edma.dev = pci->dev; + + if (!pci->edma.ops) + pci->edma.ops = &dw_pcie_edma_ops; + + pci->edma.flags |= DW_EDMA_CHIP_LOCAL; + + 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_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[6]; + int ret; + + if (pci->edma.nr_irqs == 1) + return 0; + else 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_setup(struct dw_pcie *pci) +{ + u32 val; + + if (pci->link_gen > 0) + dw_pcie_link_set_max_speed(pci, pci->link_gen); + + /* 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); +} |