This patch adds basic driver PCI Express controller found on Broadcom set-top-box SoCs, e.g. BCM2711. The code is based on Linux upstream driver (pcie-brcmstb.c) with MSI handling removed. The inbound access memory region is not currently parsed from dma-ranges DT property and a fixed 3GB region is used.
The patch has been tested on RPI4 board, i.e. on BCM2711 SoC with VL805 USB Host Controller.
Signed-off-by: Nicolas Saenz Julienne nsaenzjulienne@suse.de Signed-off-by: Sylwester Nawrocki s.nawrocki@samsung.com --- Changes since v3: - none. Changes since v2 (mostly addressing Simon's review comments): - removed MDO_RD_DONE, MDIO_WT_DONE macro definitions, - updated the Kconfig entry help text, - reordered #include entries to match the coding style, - s/udev/dev, - s/ENODEV/EINVAL in brcm_pcie_probe() and brcm_pcie_config_address() functions, - Simplified brcm_pcie_mdio_{read, write} functions (readl_poll_timeout), - shortened register bit fields macro definitions, - dropped brcm_pcie_perst_set() and brcm_pcie_bridge_sw_init_set() function in favour of direct clrbits_le32/setbits_le32 calls, - use setbits_le32/clrbits_le32/clrsetbits_le32 instead of readl(), u32p_replace_bits(), writel() sequence - simplified brcm_pcie_config_address(), brcm_pcie_set_gen() functions, - changed reset pulse delay to 100 us, - Replaced FIELD_GET() with open coded bitwise operations, - brcm_cpie_cfg_index() function merged into brcm_pcie_config_address(), - use standard PCI PCI_EXP_LNKSTA_CLS_* link speed defines - added kernel-doc function comments.
Changes since v1: - fixed argument in brcm_pcie_set_ssc() function call, - changed rc_bar2_size assignment to value 0xC0000000, as in upstream devicetree. Changes since RFC: - reworked to align with current Linux mainline version and u-boot driver by Nicolas Saenz Julienne. --- drivers/pci/Kconfig | 9 + drivers/pci/Makefile | 1 + drivers/pci/pcie_brcmstb.c | 623 +++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 633 insertions(+) create mode 100644 drivers/pci/pcie_brcmstb.c
diff --git a/drivers/pci/Kconfig b/drivers/pci/Kconfig index 437cd9a..543bd46 100644 --- a/drivers/pci/Kconfig +++ b/drivers/pci/Kconfig @@ -197,4 +197,13 @@ config PCIE_MEDIATEK Say Y here if you want to enable Gen2 PCIe controller, which could be found on MT7623 SoC family.
+config PCI_BRCMSTB + bool "Broadcom STB PCIe controller" + depends on DM_PCI + depends on ARCH_BCM283X + help + Say Y here if you want to enable support for PCIe controller + on Broadcom set-top-box (STB) SoCs. + This driver currently supports only BCM2711 SoC and RC mode + of the controller. endif diff --git a/drivers/pci/Makefile b/drivers/pci/Makefile index c051ecc..3e53b1f 100644 --- a/drivers/pci/Makefile +++ b/drivers/pci/Makefile @@ -43,3 +43,4 @@ obj-$(CONFIG_PCI_PHYTIUM) += pcie_phytium.o obj-$(CONFIG_PCIE_INTEL_FPGA) += pcie_intel_fpga.o obj-$(CONFIG_PCI_KEYSTONE) += pcie_dw_ti.o obj-$(CONFIG_PCIE_MEDIATEK) += pcie_mediatek.o +obj-$(CONFIG_PCI_BRCMSTB) += pcie_brcmstb.o diff --git a/drivers/pci/pcie_brcmstb.c b/drivers/pci/pcie_brcmstb.c new file mode 100644 index 0000000..dade79e --- /dev/null +++ b/drivers/pci/pcie_brcmstb.c @@ -0,0 +1,623 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Broadcom STB PCIe controller driver + * + * Copyright (C) 2020 Samsung Electronics Co., Ltd. + * + * Based on upstream Linux kernel driver: + * drivers/pci/controller/pcie-brcmstb.c + * Copyright (C) 2009 - 2017 Broadcom + * + * Based driver by Nicolas Saenz Julienne + * Copyright (C) 2020 Nicolas Saenz Julienne nsaenzjulienne@suse.de + */ + +#include <common.h> +#include <errno.h> +#include <dm.h> +#include <dm/ofnode.h> +#include <pci.h> +#include <asm/io.h> +#include <linux/bitfield.h> +#include <linux/log2.h> +#include <linux/iopoll.h> + +/* Offset of the mandatory PCIe capability config registers */ +#define BRCM_PCIE_CAP_REGS 0x00ac + +/* The PCIe controller register offsets */ +#define PCIE_RC_CFG_VENDOR_SPECIFIC_REG1 0x0188 +#define VENDOR_SPECIFIC_REG1_ENDIAN_MODE_BAR2_MASK 0xc +#define VENDOR_SPECIFIC_REG1_LITTLE_ENDIAN 0x0 + +#define PCIE_RC_CFG_PRIV1_ID_VAL3 0x043c +#define CFG_PRIV1_ID_VAL3_CLASS_CODE_MASK 0xffffff + +#define PCIE_RC_DL_MDIO_ADDR 0x1100 +#define PCIE_RC_DL_MDIO_WR_DATA 0x1104 +#define PCIE_RC_DL_MDIO_RD_DATA 0x1108 + +#define PCIE_MISC_MISC_CTRL 0x4008 +#define MISC_CTRL_SCB_ACCESS_EN_MASK 0x1000 +#define MISC_CTRL_CFG_READ_UR_MODE_MASK 0x2000 +#define MISC_CTRL_MAX_BURST_SIZE_MASK 0x300000 +#define MISC_CTRL_MAX_BURST_SIZE_128 0x0 +#define MISC_CTRL_SCB0_SIZE_MASK 0xf8000000 + +#define PCIE_MISC_CPU_2_PCIE_MEM_WIN0_LO 0x400c +#define PCIE_MEM_WIN0_LO(win) \ + PCIE_MISC_CPU_2_PCIE_MEM_WIN0_LO + ((win) * 4) + +#define PCIE_MISC_CPU_2_PCIE_MEM_WIN0_HI 0x4010 +#define PCIE_MEM_WIN0_HI(win) \ + PCIE_MISC_CPU_2_PCIE_MEM_WIN0_HI + ((win) * 4) + +#define PCIE_MISC_RC_BAR1_CONFIG_LO 0x402c +#define RC_BAR1_CONFIG_LO_SIZE_MASK 0x1f + +#define PCIE_MISC_RC_BAR2_CONFIG_LO 0x4034 +#define RC_BAR2_CONFIG_LO_SIZE_MASK 0x1f +#define PCIE_MISC_RC_BAR2_CONFIG_HI 0x4038 + +#define PCIE_MISC_RC_BAR3_CONFIG_LO 0x403c +#define RC_BAR3_CONFIG_LO_SIZE_MASK 0x1f + +#define PCIE_MISC_PCIE_STATUS 0x4068 +#define STATUS_PCIE_PORT_MASK 0x80 +#define STATUS_PCIE_PORT_SHIFT 7 +#define STATUS_PCIE_DL_ACTIVE_MASK 0x20 +#define STATUS_PCIE_DL_ACTIVE_SHIFT 5 +#define STATUS_PCIE_PHYLINKUP_MASK 0x10 +#define STATUS_PCIE_PHYLINKUP_SHIFT 4 + +#define PCIE_MISC_CPU_2_PCIE_MEM_WIN0_BASE_LIMIT 0x4070 +#define MEM_WIN0_BASE_LIMIT_LIMIT_MASK 0xfff00000 +#define MEM_WIN0_BASE_LIMIT_BASE_MASK 0xfff0 +#define MEM_WIN0_BASE_LIMIT_BASE_HI_SHIFT 12 +#define PCIE_MEM_WIN0_BASE_LIMIT(win) \ + PCIE_MISC_CPU_2_PCIE_MEM_WIN0_BASE_LIMIT + ((win) * 4) + +#define PCIE_MISC_CPU_2_PCIE_MEM_WIN0_BASE_HI 0x4080 +#define MEM_WIN0_BASE_HI_BASE_MASK 0xff +#define PCIE_MEM_WIN0_BASE_HI(win) \ + PCIE_MISC_CPU_2_PCIE_MEM_WIN0_BASE_HI + ((win) * 8) + +#define PCIE_MISC_CPU_2_PCIE_MEM_WIN0_LIMIT_HI 0x4084 +#define PCIE_MEM_WIN0_LIMIT_HI_LIMIT_MASK 0xff +#define PCIE_MEM_WIN0_LIMIT_HI(win) \ + PCIE_MISC_CPU_2_PCIE_MEM_WIN0_LIMIT_HI + ((win) * 8) + +#define PCIE_MISC_HARD_PCIE_HARD_DEBUG 0x4204 +#define PCIE_HARD_DEBUG_CLKREQ_DEBUG_ENABLE_MASK 0x2 +#define PCIE_HARD_DEBUG_SERDES_IDDQ_MASK 0x08000000 + +#define PCIE_MSI_INTR2_CLR 0x4508 +#define PCIE_MSI_INTR2_MASK_SET 0x4510 + +#define PCIE_EXT_CFG_DATA 0x8000 + +#define PCIE_EXT_CFG_INDEX 0x9000 +#define PCIE_EXT_BUSNUM_SHIFT 20 +#define PCIE_EXT_SLOT_SHIFT 15 +#define PCIE_EXT_FUNC_SHIFT 12 + +#define PCIE_RGR1_SW_INIT_1 0x9210 +#define RGR1_SW_INIT_1_PERST_MASK 0x1 +#define RGR1_SW_INIT_1_INIT_MASK 0x2 + +/* PCIe parameters */ +#define BRCM_NUM_PCIE_OUT_WINS 4 + +/* MDIO registers */ +#define MDIO_PORT0 0x0 +#define MDIO_DATA_MASK 0x7fffffff +#define MDIO_DATA_SHIFT 0 +#define MDIO_PORT_MASK 0xf0000 +#define MDIO_PORT_SHIFT 16 +#define MDIO_REGAD_MASK 0xffff +#define MDIO_REGAD_SHIFT 0 +#define MDIO_CMD_MASK 0xfff00000 +#define MDIO_CMD_SHIFT 20 +#define MDIO_CMD_READ 0x1 +#define MDIO_CMD_WRITE 0x0 +#define MDIO_DATA_DONE_MASK 0x80000000 +#define SSC_REGS_ADDR 0x1100 +#define SET_ADDR_OFFSET 0x1f +#define SSC_CNTL_OFFSET 0x2 +#define SSC_CNTL_OVRD_EN_MASK 0x8000 +#define SSC_CNTL_OVRD_VAL_MASK 0x4000 +#define SSC_STATUS_OFFSET 0x1 +#define SSC_STATUS_SSC_MASK 0x400 +#define SSC_STATUS_SSC_SHIFT 10 +#define SSC_STATUS_PLL_LOCK_MASK 0x800 +#define SSC_STATUS_PLL_LOCK_SHIFT 11 + +/** + * struct brcm_pcie - the PCIe controller state + * @base: Base address of memory mapped IO registers of the controller + * @gen: Non-zero value indicates limitation of the PCIe controller operation + * to a specific generation (1, 2 or 3) + * @ssc: true indicates active Spread Spectrum Clocking operation + */ +struct brcm_pcie { + void __iomem *base; + + int gen; + bool ssc; +}; + +/** + * brcm_pcie_encode_ibar_size() - Encode the inbound "BAR" region size + * @size: The inbound region size + * + * This function converts size of the inbound "BAR" region to the non-linear + * values of the PCIE_MISC_RC_BAR[123]_CONFIG_LO register SIZE field. + * + * Return: The encoded inbound region size + */ +static int brcm_pcie_encode_ibar_size(u64 size) +{ + int log2_in = ilog2(size); + + if (log2_in >= 12 && log2_in <= 15) + /* Covers 4KB to 32KB (inclusive) */ + return (log2_in - 12) + 0x1c; + else if (log2_in >= 16 && log2_in <= 37) + /* Covers 64KB to 32GB, (inclusive) */ + return log2_in - 15; + + /* Something is awry so disable */ + return 0; +} + +/** + * brcm_pcie_rc_mode() - Check if PCIe controller is in RC mode + * @pcie: Pointer to the PCIe controller state + * + * The controller is capable of serving in both RC and EP roles. + * + * Return: true for RC mode, false for EP mode. + */ +static bool brcm_pcie_rc_mode(struct brcm_pcie *pcie) +{ + u32 val; + + val = readl(pcie->base + PCIE_MISC_PCIE_STATUS); + + return (val & STATUS_PCIE_PORT_MASK) >> STATUS_PCIE_PORT_SHIFT; +} + +/** + * brcm_pcie_link_up() - Check whether the PCIe link is up + * @pcie: Pointer to the PCIe controller state + * + * Return: true if the link is up, false otherwise. + */ +static bool brcm_pcie_link_up(struct brcm_pcie *pcie) +{ + u32 val, dla, plu; + + val = readl(pcie->base + PCIE_MISC_PCIE_STATUS); + dla = (val & STATUS_PCIE_DL_ACTIVE_MASK) >> STATUS_PCIE_DL_ACTIVE_SHIFT; + plu = (val & STATUS_PCIE_PHYLINKUP_MASK) >> STATUS_PCIE_PHYLINKUP_SHIFT; + + return dla && plu; +} + +static int brcm_pcie_config_address(const struct udevice *dev, pci_dev_t bdf, + uint offset, void **paddress) +{ + struct brcm_pcie *pcie = dev_get_priv(dev); + unsigned int pci_bus = PCI_BUS(bdf); + unsigned int pci_dev = PCI_DEV(bdf); + unsigned int pci_func = PCI_FUNC(bdf); + int idx; + + /* + * Busses 0 (host PCIe bridge) and 1 (its immediate child) + * are limited to a single device each + */ + if (pci_bus < 2 && pci_dev > 0) + return -EINVAL; + + /* Accesses to the RC go right to the RC registers */ + if (pci_bus == 0) { + *paddress = pcie->base + offset; + return 0; + } + + /* For devices, write to the config space index register */ + idx = (pci_bus << PCIE_EXT_BUSNUM_SHIFT) + | (pci_dev << PCIE_EXT_SLOT_SHIFT) + | (pci_func << PCIE_EXT_FUNC_SHIFT); + + writel(idx, pcie->base + PCIE_EXT_CFG_INDEX); + *paddress = pcie->base + PCIE_EXT_CFG_DATA + offset; + + return 0; +} + +static int brcm_pcie_read_config(const struct udevice *bus, pci_dev_t bdf, + uint offset, ulong *valuep, + enum pci_size_t size) +{ + return pci_generic_mmap_read_config(bus, brcm_pcie_config_address, + bdf, offset, valuep, size); +} + +static int brcm_pcie_write_config(struct udevice *bus, pci_dev_t bdf, + uint offset, ulong value, + enum pci_size_t size) +{ + return pci_generic_mmap_write_config(bus, brcm_pcie_config_address, + bdf, offset, value, size); +} + +static const char *link_speed_to_str(unsigned int cls) +{ + switch (cls) { + case PCI_EXP_LNKSTA_CLS_2_5GB: return "2.5"; + case PCI_EXP_LNKSTA_CLS_5_0GB: return "5.0"; + case PCI_EXP_LNKSTA_CLS_8_0GB: return "8.0"; + default: + break; + } + + return "??"; +} + +static u32 brcm_pcie_mdio_form_pkt(unsigned int port, unsigned int regad, + unsigned int cmd) +{ + u32 pkt; + + pkt = (port << MDIO_PORT_SHIFT) & MDIO_PORT_MASK; + pkt |= (regad << MDIO_REGAD_SHIFT) & MDIO_REGAD_MASK; + pkt |= (cmd << MDIO_CMD_SHIFT) & MDIO_CMD_MASK; + + return pkt; +} + +/** + * brcm_pcie_mdio_read() - Perform a register read on the internal MDIO bus + * @base: Pointer to the PCIe controller IO registers + * @port: The MDIO port number + * @regad: The register address + * @val: A pointer at which to store the read value + * + * Return: 0 on success and register value in @val, negative error value + * on failure. + */ +static int brcm_pcie_mdio_read(void __iomem *base, unsigned int port, + unsigned int regad, u32 *val) +{ + u32 data, addr; + int ret; + + addr = brcm_pcie_mdio_form_pkt(port, regad, MDIO_CMD_READ); + writel(addr, base + PCIE_RC_DL_MDIO_ADDR); + readl(base + PCIE_RC_DL_MDIO_ADDR); + + ret = readl_poll_timeout(base + PCIE_RC_DL_MDIO_RD_DATA, data, + (data & MDIO_DATA_DONE_MASK), 100); + + *val = data & MDIO_DATA_MASK; + + return ret; +} + +/** + * brcm_pcie_mdio_write() - Perform a register write on the internal MDIO bus + * @base: Pointer to the PCIe controller IO registers + * @port: The MDIO port number + * @regad: Address of the register + * @wrdata: The value to write + * + * Return: 0 on success, negative error value on failure. + */ +static int brcm_pcie_mdio_write(void __iomem *base, unsigned int port, + unsigned int regad, u16 wrdata) +{ + u32 data, addr; + + addr = brcm_pcie_mdio_form_pkt(port, regad, MDIO_CMD_WRITE); + writel(addr, base + PCIE_RC_DL_MDIO_ADDR); + readl(base + PCIE_RC_DL_MDIO_ADDR); + writel(MDIO_DATA_DONE_MASK | wrdata, base + PCIE_RC_DL_MDIO_WR_DATA); + + return readl_poll_timeout(base + PCIE_RC_DL_MDIO_WR_DATA, data, + !(data & MDIO_DATA_DONE_MASK), 100); +} + +/** + * brcm_pcie_set_ssc() - Configure the controller for Spread Spectrum Clocking + * @base: pointer to the PCIe controller IO registers + * + * Return: 0 on success, negative error value on failure. + */ +static int brcm_pcie_set_ssc(void __iomem *base) +{ + int pll, ssc; + int ret; + u32 tmp; + + ret = brcm_pcie_mdio_write(base, MDIO_PORT0, SET_ADDR_OFFSET, + SSC_REGS_ADDR); + if (ret < 0) + return ret; + + ret = brcm_pcie_mdio_read(base, MDIO_PORT0, SSC_CNTL_OFFSET, &tmp); + if (ret < 0) + return ret; + + tmp |= (SSC_CNTL_OVRD_EN_MASK | SSC_CNTL_OVRD_VAL_MASK); + + ret = brcm_pcie_mdio_write(base, MDIO_PORT0, SSC_CNTL_OFFSET, tmp); + if (ret < 0) + return ret; + + udelay(1000); + ret = brcm_pcie_mdio_read(base, MDIO_PORT0, SSC_STATUS_OFFSET, &tmp); + if (ret < 0) + return ret; + + ssc = (tmp & SSC_STATUS_SSC_MASK) >> SSC_STATUS_SSC_SHIFT; + pll = (tmp & SSC_STATUS_PLL_LOCK_MASK) >> SSC_STATUS_PLL_LOCK_SHIFT; + + return ssc && pll ? 0 : -EIO; +} + +/** + * brcm_pcie_set_gen() - Limits operation to a specific generation (1, 2 or 3) + * @pcie: pointer to the PCIe controller state + * @gen: PCIe generation to limit the controller's operation to + */ +static void brcm_pcie_set_gen(struct brcm_pcie *pcie, unsigned int gen) +{ + void __iomem *cap_base = pcie->base + BRCM_PCIE_CAP_REGS; + + u16 lnkctl2 = readw(cap_base + PCI_EXP_LNKCTL2); + u32 lnkcap = readl(cap_base + PCI_EXP_LNKCAP); + + lnkcap = (lnkcap & ~PCI_EXP_LNKCAP_SLS) | gen; + writel(lnkcap, cap_base + PCI_EXP_LNKCAP); + + lnkctl2 = (lnkctl2 & ~0xf) | gen; + writew(lnkctl2, cap_base + PCI_EXP_LNKCTL2); +} + +static void brcm_pcie_set_outbound_win(struct brcm_pcie *pcie, + unsigned int win, u64 phys_addr, + u64 pcie_addr, u64 size) +{ + void __iomem *base = pcie->base; + u32 phys_addr_mb_high, limit_addr_mb_high; + phys_addr_t phys_addr_mb, limit_addr_mb; + int high_addr_shift; + u32 tmp; + + /* Set the base of the pcie_addr window */ + writel(lower_32_bits(pcie_addr), base + PCIE_MEM_WIN0_LO(win)); + writel(upper_32_bits(pcie_addr), base + PCIE_MEM_WIN0_HI(win)); + + /* Write the addr base & limit lower bits (in MBs) */ + phys_addr_mb = phys_addr / SZ_1M; + limit_addr_mb = (phys_addr + size - 1) / SZ_1M; + + tmp = readl(base + PCIE_MEM_WIN0_BASE_LIMIT(win)); + u32p_replace_bits(&tmp, phys_addr_mb, + MEM_WIN0_BASE_LIMIT_BASE_MASK); + u32p_replace_bits(&tmp, limit_addr_mb, + MEM_WIN0_BASE_LIMIT_LIMIT_MASK); + writel(tmp, base + PCIE_MEM_WIN0_BASE_LIMIT(win)); + + /* Write the cpu & limit addr upper bits */ + high_addr_shift = MEM_WIN0_BASE_LIMIT_BASE_HI_SHIFT; + phys_addr_mb_high = phys_addr_mb >> high_addr_shift; + tmp = readl(base + PCIE_MEM_WIN0_BASE_HI(win)); + u32p_replace_bits(&tmp, phys_addr_mb_high, + MEM_WIN0_BASE_HI_BASE_MASK); + writel(tmp, base + PCIE_MEM_WIN0_BASE_HI(win)); + + limit_addr_mb_high = limit_addr_mb >> high_addr_shift; + tmp = readl(base + PCIE_MEM_WIN0_LIMIT_HI(win)); + u32p_replace_bits(&tmp, limit_addr_mb_high, + PCIE_MEM_WIN0_LIMIT_HI_LIMIT_MASK); + writel(tmp, base + PCIE_MEM_WIN0_LIMIT_HI(win)); +} + +static int brcm_pcie_probe(struct udevice *dev) +{ + struct udevice *ctlr = pci_get_controller(dev); + struct pci_controller *hose = dev_get_uclass_priv(ctlr); + struct brcm_pcie *pcie = dev_get_priv(dev); + void __iomem *base = pcie->base; + bool ssc_good = false; + int num_out_wins = 0; + u64 rc_bar2_offset, rc_bar2_size; + unsigned int scb_size_val; + int i, ret; + u16 nlw, cls, lnksta; + u32 tmp; + + /* + * Reset the bridge, assert the fundamental reset. Note for some SoCs, + * e.g. BCM7278, the fundamental reset should not be asserted here. + * This will need to be changed when support for other SoCs is added. + */ + setbits_le32(base + PCIE_RGR1_SW_INIT_1, + RGR1_SW_INIT_1_INIT_MASK | RGR1_SW_INIT_1_PERST_MASK); + /* + * The delay is a safety precaution to preclude the reset signal + * from looking like a glitch. + */ + udelay(100); + + /* Take the bridge out of reset */ + clrbits_le32(base + PCIE_RGR1_SW_INIT_1, RGR1_SW_INIT_1_INIT_MASK); + + clrbits_le32(base + PCIE_MISC_HARD_PCIE_HARD_DEBUG, + PCIE_HARD_DEBUG_SERDES_IDDQ_MASK); + + /* Wait for SerDes to be stable */ + udelay(100); + + /* Set SCB_MAX_BURST_SIZE, CFG_READ_UR_MODE, SCB_ACCESS_EN */ + clrsetbits_le32(base + PCIE_MISC_MISC_CTRL, + MISC_CTRL_MAX_BURST_SIZE_MASK, + MISC_CTRL_SCB_ACCESS_EN_MASK | + MISC_CTRL_CFG_READ_UR_MODE_MASK | + MISC_CTRL_MAX_BURST_SIZE_128); + /* + * TODO: When support for other SoCs than BCM2711 is added we may + * need to use the base address and size(s) provided in the dma-ranges + * property. + */ + rc_bar2_offset = 0; + rc_bar2_size = 0xc0000000; + + tmp = lower_32_bits(rc_bar2_offset); + u32p_replace_bits(&tmp, brcm_pcie_encode_ibar_size(rc_bar2_size), + RC_BAR2_CONFIG_LO_SIZE_MASK); + writel(tmp, base + PCIE_MISC_RC_BAR2_CONFIG_LO); + writel(upper_32_bits(rc_bar2_offset), + base + PCIE_MISC_RC_BAR2_CONFIG_HI); + + scb_size_val = rc_bar2_size ? + ilog2(rc_bar2_size) - 15 : 0xf; /* 0xf is 1GB */ + + tmp = readl(base + PCIE_MISC_MISC_CTRL); + u32p_replace_bits(&tmp, scb_size_val, + MISC_CTRL_SCB0_SIZE_MASK); + writel(tmp, base + PCIE_MISC_MISC_CTRL); + + /* Disable the PCIe->GISB memory window (RC_BAR1) */ + clrbits_le32(base + PCIE_MISC_RC_BAR1_CONFIG_LO, + RC_BAR1_CONFIG_LO_SIZE_MASK); + + /* Disable the PCIe->SCB memory window (RC_BAR3) */ + clrbits_le32(base + PCIE_MISC_RC_BAR3_CONFIG_LO, + RC_BAR3_CONFIG_LO_SIZE_MASK); + + /* Mask all interrupts since we are not handling any yet */ + writel(0xffffffff, base + PCIE_MSI_INTR2_MASK_SET); + + /* Clear any interrupts we find on boot */ + writel(0xffffffff, base + PCIE_MSI_INTR2_CLR); + + if (pcie->gen) + brcm_pcie_set_gen(pcie, pcie->gen); + + /* Unassert the fundamental reset */ + clrbits_le32(pcie->base + PCIE_RGR1_SW_INIT_1, + RGR1_SW_INIT_1_PERST_MASK); + + /* Give the RC/EP time to wake up, before trying to configure RC. + * Intermittently check status for link-up, up to a total of 100ms. + */ + for (i = 0; i < 100 && !brcm_pcie_link_up(pcie); i += 5) + mdelay(5); + + if (!brcm_pcie_link_up(pcie)) { + printf("PCIe BRCM: link down\n"); + return -EINVAL; + } + + if (!brcm_pcie_rc_mode(pcie)) { + printf("PCIe misconfigured; is in EP mode\n"); + return -EINVAL; + } + + for (i = 0; i < hose->region_count; i++) { + struct pci_region *reg = &hose->regions[i]; + + if (reg->flags != PCI_REGION_MEM) + continue; + + if (num_out_wins >= BRCM_NUM_PCIE_OUT_WINS) + return -EINVAL; + + brcm_pcie_set_outbound_win(pcie, num_out_wins, reg->phys_start, + reg->bus_start, reg->size); + + num_out_wins++; + } + + /* + * For config space accesses on the RC, show the right class for + * a PCIe-PCIe bridge (the default setting is to be EP mode). + */ + clrsetbits_le32(base + PCIE_RC_CFG_PRIV1_ID_VAL3, + CFG_PRIV1_ID_VAL3_CLASS_CODE_MASK, 0x060400); + + if (pcie->ssc) { + ret = brcm_pcie_set_ssc(pcie->base); + if (!ret) + ssc_good = true; + else + printf("PCIe BRCM: failed attempt to enter SSC mode\n"); + } + + lnksta = readw(base + BRCM_PCIE_CAP_REGS + PCI_EXP_LNKSTA); + cls = lnksta & PCI_EXP_LNKSTA_CLS; + nlw = (lnksta & PCI_EXP_LNKSTA_NLW) >> PCI_EXP_LNKSTA_NLW_SHIFT; + + printf("PCIe BRCM: link up, %s Gbps x%u %s\n", link_speed_to_str(cls), + nlw, ssc_good ? "(SSC)" : "(!SSC)"); + + /* PCIe->SCB endian mode for BAR */ + clrsetbits_le32(base + PCIE_RC_CFG_VENDOR_SPECIFIC_REG1, + VENDOR_SPECIFIC_REG1_ENDIAN_MODE_BAR2_MASK, + VENDOR_SPECIFIC_REG1_LITTLE_ENDIAN); + /* + * Refclk from RC should be gated with CLKREQ# input when ASPM L0s,L1 + * is enabled => setting the CLKREQ_DEBUG_ENABLE field to 1. + */ + setbits_le32(base + PCIE_MISC_HARD_PCIE_HARD_DEBUG, + PCIE_HARD_DEBUG_CLKREQ_DEBUG_ENABLE_MASK); + + return 0; +} + +static int brcm_pcie_ofdata_to_platdata(struct udevice *dev) +{ + struct brcm_pcie *pcie = dev_get_priv(dev); + ofnode dn = dev_ofnode(dev); + u32 max_link_speed; + int ret; + + /* Get the controller base address */ + pcie->base = dev_read_addr_ptr(dev); + if (!pcie->base) + return -EINVAL; + + pcie->ssc = ofnode_read_bool(dn, "brcm,enable-ssc"); + + ret = ofnode_read_u32(dn, "max-link-speed", &max_link_speed); + if (ret < 0 || max_link_speed > 4) + pcie->gen = 0; + else + pcie->gen = max_link_speed; + + return 0; +} + +static const struct dm_pci_ops brcm_pcie_ops = { + .read_config = brcm_pcie_read_config, + .write_config = brcm_pcie_write_config, +}; + +static const struct udevice_id brcm_pcie_ids[] = { + { .compatible = "brcm,bcm2711-pcie" }, + { } +}; + +U_BOOT_DRIVER(pcie_brcm_base) = { + .name = "pcie_brcm", + .id = UCLASS_PCI, + .ops = &brcm_pcie_ops, + .of_match = brcm_pcie_ids, + .probe = brcm_pcie_probe, + .ofdata_to_platdata = brcm_pcie_ofdata_to_platdata, + .priv_auto_alloc_size = sizeof(struct brcm_pcie), +};