[PATCH v3 8/9] pci: Add driver for Broadcom BCM2711 SoC PCIe controller
Sylwester Nawrocki
s.nawrocki at samsung.com
Tue May 12 20:47:15 CEST 2020
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 at suse.de>
Signed-off-by: Sylwester Nawrocki <s.nawrocki at samsung.com>
---
Changes since v2:
- 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 at 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),
+};
--
2.7.4
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