File 0029-pci-Add-driver-for-Broadcom-STB-PCI.patch of Package u-boot

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File 0029-pci-Add-driver-for-Broadcom-STB-PCI.patch of Package u-boot (Revision 6590d10cd21f7ac73b9ef7f842063e2a)

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From 4080d6bfb126c898d1c853a82079b25805c6465e Mon Sep 17 00:00:00 2001
From: Sylwester Nawrocki <s.nawrocki@samsung.com>
Date: Mon, 4 May 2020 14:45:22 +0200
Subject: [PATCH] pci: Add driver for Broadcom STB PCIe controller

This patch adds basic driver for the Broadcom STB PCIe host controller.
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 4GB 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>
---
 drivers/pci/Kconfig        |   6 +
 drivers/pci/Makefile       |   1 +
 drivers/pci/pcie_brcmstb.c | 594 +++++++++++++++++++++++++++++++++++++
 3 files changed, 601 insertions(+)
 create mode 100644 drivers/pci/pcie_brcmstb.c

diff --git a/drivers/pci/Kconfig b/drivers/pci/Kconfig
index 13603b9d57..49198a663f 100644
--- a/drivers/pci/Kconfig
+++ b/drivers/pci/Kconfig
@@ -173,4 +173,10 @@ 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 Broadcom STB PCIe controller support.
 endif
diff --git a/drivers/pci/Makefile b/drivers/pci/Makefile
index da8b826d69..b981c2fbda 100644
--- a/drivers/pci/Makefile
+++ b/drivers/pci/Makefile
@@ -42,3 +42,4 @@ 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 0000000000..d1d86bcab0
--- /dev/null
+++ b/drivers/pci/pcie_brcmstb.c
@@ -0,0 +1,594 @@
+// 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 <asm/io.h>
+#include <common.h>
+#include <dm.h>
+#include <dm/ofnode.h>
+#include <errno.h>
+#include <linux/bitfield.h>
+#include <linux/log2.h>
+#include <pci.h>
+
+/* BRCM_PCIE_CAP_REGS - Offset for the mandatory capability config regs */
+#define BRCM_PCIE_CAP_REGS				0x00ac
+
+/* Broadcom STB PCIe Register Offsets */
+#define PCIE_RC_CFG_VENDOR_VENDOR_SPECIFIC_REG1				0x0188
+#define  PCIE_RC_CFG_VENDOR_VENDOR_SPECIFIC_REG1_ENDIAN_MODE_BAR2_MASK	0xc
+#define  PCIE_RC_CFG_VENDOR_SPCIFIC_REG1_LITTLE_ENDIAN			0x0
+
+#define PCIE_RC_CFG_PRIV1_ID_VAL3			0x043c
+#define  PCIE_RC_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  PCIE_MISC_MISC_CTRL_SCB_ACCESS_EN_MASK		0x1000
+#define  PCIE_MISC_MISC_CTRL_CFG_READ_UR_MODE_MASK	0x2000
+#define  PCIE_MISC_MISC_CTRL_MAX_BURST_SIZE_MASK	0x300000
+#define  PCIE_MISC_MISC_CTRL_MAX_BURST_SIZE_128		0x0
+#define  PCIE_MISC_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  PCIE_MISC_RC_BAR1_CONFIG_LO_SIZE_MASK		0x1f
+
+#define PCIE_MISC_RC_BAR2_CONFIG_LO			0x4034
+#define  PCIE_MISC_RC_BAR2_CONFIG_LO_SIZE_MASK		0x1f
+#define PCIE_MISC_RC_BAR2_CONFIG_HI			0x4038
+
+#define PCIE_MISC_RC_BAR3_CONFIG_LO			0x403c
+#define  PCIE_MISC_RC_BAR3_CONFIG_LO_SIZE_MASK		0x1f
+
+#define PCIE_MISC_PCIE_STATUS				0x4068
+#define  PCIE_MISC_PCIE_STATUS_PCIE_PORT_MASK		0x80
+#define  PCIE_MISC_PCIE_STATUS_PCIE_DL_ACTIVE_MASK	0x20
+#define  PCIE_MISC_PCIE_STATUS_PCIE_PHYLINKUP_MASK	0x10
+#define  PCIE_MISC_PCIE_STATUS_PCIE_LINK_IN_L23_MASK	0x40
+
+#define PCIE_MISC_CPU_2_PCIE_MEM_WIN0_BASE_LIMIT		 0x4070
+#define  PCIE_MISC_CPU_2_PCIE_MEM_WIN0_BASE_LIMIT_LIMIT_MASK	 0xfff00000
+#define  PCIE_MISC_CPU_2_PCIE_MEM_WIN0_BASE_LIMIT_BASE_MASK	 0xfff0
+#define  PCIE_MISC_CPU_2_PCIE_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  PCIE_MISC_CPU_2_PCIE_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_MISC_CPU_2_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_MISC_HARD_PCIE_HARD_DEBUG_CLKREQ_DEBUG_ENABLE_MASK 0x2
+#define  PCIE_MISC_HARD_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  PCIE_RGR1_SW_INIT_1_PERST_MASK			0x1
+#define  PCIE_RGR1_SW_INIT_1_INIT_MASK			0x2
+
+/* PCIe parameters */
+#define BRCM_NUM_PCIE_OUT_WINS		0x4
+
+/* MDIO registers */
+#define MDIO_PORT0			0x0
+#define MDIO_DATA_MASK			0x7fffffff
+#define MDIO_PORT_MASK			0xf0000
+#define MDIO_REGAD_MASK			0xffff
+#define MDIO_CMD_MASK			0xfff00000
+#define MDIO_CMD_READ			0x1
+#define MDIO_CMD_WRITE			0x0
+#define MDIO_DATA_DONE_MASK		0x80000000
+#define MDIO_RD_DONE(x)			(((x) & MDIO_DATA_DONE_MASK) ? 1 : 0)
+#define MDIO_WT_DONE(x)			(((x) & MDIO_DATA_DONE_MASK) ? 0 : 1)
+#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_PLL_LOCK_MASK	0x800
+
+struct brcm_pcie {
+	void __iomem		*base;
+
+	int			gen;
+	bool			ssc;
+};
+
+#define msleep(a) udelay((a) * 1000)
+
+/*
+ * This is to convert the size of the inbound "BAR" region to the
+ * non-linear values of PCIE_X_MISC_RC_BAR[123]_CONFIG_LO.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;
+}
+
+/* Configuration space read/write support */
+static inline int brcm_pcie_cfg_index(pci_dev_t bdf, int reg)
+{
+	return (PCI_DEV(bdf) << PCIE_EXT_SLOT_SHIFT)
+		| (PCI_FUNC(bdf) << PCIE_EXT_FUNC_SHIFT)
+		| (PCI_BUS(bdf) << PCIE_EXT_BUSNUM_SHIFT)
+		| (reg & ~3);
+}
+
+/* The controller is capable of serving in both RC and EP roles */
+static bool brcm_pcie_rc_mode(struct brcm_pcie *pcie)
+{
+	u32 val = readl(pcie->base + PCIE_MISC_PCIE_STATUS);
+
+	return !!FIELD_GET(PCIE_MISC_PCIE_STATUS_PCIE_PORT_MASK, val);
+}
+
+static bool brcm_pcie_link_up(struct brcm_pcie *pcie)
+{
+	u32 val = readl(pcie->base + PCIE_MISC_PCIE_STATUS);
+	u32 dla = FIELD_GET(PCIE_MISC_PCIE_STATUS_PCIE_DL_ACTIVE_MASK, val);
+	u32 plu = FIELD_GET(PCIE_MISC_PCIE_STATUS_PCIE_PHYLINKUP_MASK, val);
+
+	return dla && plu;
+}
+
+static int brcm_pcie_config_address(struct udevice *udev, pci_dev_t bdf,
+				    uint offset, void **paddress)
+{
+	struct brcm_pcie *pcie = dev_get_priv(udev);
+	unsigned int bus = PCI_BUS(bdf);
+	unsigned int dev = PCI_DEV(bdf);
+	int idx;
+
+	/*
+	 * Busses 0 (host PCIe bridge) and 1 (its immediate child)
+	 * are limited to a single device each
+	 */
+	if ((bus == (udev->seq + 1)) && dev > 0)
+		return -ENODEV;
+
+	/* Accesses to the RC go right to the RC registers if PCI device == 0 */
+	if (bus == udev->seq) {
+		if (PCI_DEV(bdf))
+			return -ENODEV;
+
+		*paddress = pcie->base + offset;
+		return 0;
+	}
+
+	/* For devices, write to the config space index register */
+	idx = brcm_pcie_cfg_index(bdf, 0);
+
+	writel(idx, pcie->base + PCIE_EXT_CFG_INDEX);
+	*paddress = pcie->base + PCIE_EXT_CFG_DATA + offset;
+
+	return 0;
+}
+
+static int brcm_pcie_read_config(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 s)
+{
+	static const char * const speed_str[] = { "??", "2.5", "5.0", "8.0" };
+
+	if (s >= ARRAY_SIZE(speed_str))
+		s = 0;
+
+	return speed_str[s];
+}
+
+static inline void brcm_pcie_bridge_sw_init_set(struct brcm_pcie *pcie, u32 val)
+{
+	u32 tmp;
+
+	tmp = readl(pcie->base + PCIE_RGR1_SW_INIT_1);
+	u32p_replace_bits(&tmp, val, PCIE_RGR1_SW_INIT_1_INIT_MASK);
+	writel(tmp, pcie->base + PCIE_RGR1_SW_INIT_1);
+}
+
+static inline void brcm_pcie_perst_set(struct brcm_pcie *pcie, u32 val)
+{
+	u32 tmp;
+
+	tmp = readl(pcie->base + PCIE_RGR1_SW_INIT_1);
+	u32p_replace_bits(&tmp, val, PCIE_RGR1_SW_INIT_1_PERST_MASK);
+	writel(tmp, pcie->base + PCIE_RGR1_SW_INIT_1);
+}
+
+static u32 brcm_pcie_mdio_form_pkt(int port, int regad, int cmd)
+{
+	u32 pkt = 0;
+
+	pkt |= FIELD_PREP(MDIO_PORT_MASK, port);
+	pkt |= FIELD_PREP(MDIO_REGAD_MASK, regad);
+	pkt |= FIELD_PREP(MDIO_CMD_MASK, cmd);
+
+	return pkt;
+}
+
+/* Negative return value indicates error */
+static int brcm_pcie_mdio_read(void __iomem *base, u8 port, u8 regad, u32 *val)
+{
+	int tries;
+	u32 data;
+
+	writel(brcm_pcie_mdio_form_pkt(port, regad, MDIO_CMD_READ),
+	       base + PCIE_RC_DL_MDIO_ADDR);
+	readl(base + PCIE_RC_DL_MDIO_ADDR);
+
+	data = readl(base + PCIE_RC_DL_MDIO_RD_DATA);
+	for (tries = 0; !MDIO_RD_DONE(data) && tries < 10; tries++) {
+		udelay(10);
+		data = readl(base + PCIE_RC_DL_MDIO_RD_DATA);
+	}
+
+	*val = FIELD_GET(MDIO_DATA_MASK, data);
+	return MDIO_RD_DONE(data) ? 0 : -EIO;
+}
+
+/* Negative return value indicates error */
+static int brcm_pcie_mdio_write(void __iomem *base, u8 port,
+				u8 regad, u16 wrdata)
+{
+	int tries;
+	u32 data;
+
+	writel(brcm_pcie_mdio_form_pkt(port, regad, MDIO_CMD_WRITE),
+	       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);
+
+	data = readl(base + PCIE_RC_DL_MDIO_WR_DATA);
+	for (tries = 0; !MDIO_WT_DONE(data) && tries < 10; tries++) {
+		udelay(10);
+		data = readl(base + PCIE_RC_DL_MDIO_WR_DATA);
+	}
+
+	return MDIO_WT_DONE(data) ? 0 : -EIO;
+}
+
+/*
+ * Configures device for Spread Spectrum Clocking (SSC) mode; negative
+ * return value indicates error.
+ */
+static int brcm_pcie_set_ssc(struct brcm_pcie *pcie)
+{
+	void __iomem *base = pcie->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;
+
+	u32p_replace_bits(&tmp, 1, SSC_CNTL_OVRD_EN_MASK);
+	u32p_replace_bits(&tmp, 1, 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 = FIELD_GET(SSC_STATUS_SSC_MASK, tmp);
+	pll = FIELD_GET(SSC_STATUS_PLL_LOCK_MASK, tmp);
+
+	return ssc && pll ? 0 : -EIO;
+}
+
+/* Limits operation to a specific generation (1, 2, or 3) */
+static void brcm_pcie_set_gen(struct brcm_pcie *pcie, int gen)
+{
+	void __iomem *base = pcie->base;
+
+	u16 lnkctl2 = readw(base + BRCM_PCIE_CAP_REGS + PCI_EXP_LNKCTL2);
+	u32 lnkcap = readl(base + BRCM_PCIE_CAP_REGS + PCI_EXP_LNKCAP);
+
+	lnkcap = (lnkcap & ~PCI_EXP_LNKCAP_SLS) | gen;
+	writel(lnkcap, base + BRCM_PCIE_CAP_REGS + PCI_EXP_LNKCAP);
+
+	lnkctl2 = (lnkctl2 & ~0xf) | gen;
+	writew(lnkctl2, base + BRCM_PCIE_CAP_REGS + 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,
+			  PCIE_MISC_CPU_2_PCIE_MEM_WIN0_BASE_LIMIT_BASE_MASK);
+	u32p_replace_bits(&tmp, limit_addr_mb,
+			  PCIE_MISC_CPU_2_PCIE_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 = PCIE_MISC_CPU_2_PCIE_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,
+			  PCIE_MISC_CPU_2_PCIE_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_MISC_CPU_2_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 */
+	brcm_pcie_bridge_sw_init_set(pcie, 1);
+
+	udelay(150);
+
+	/* Take the bridge out of reset */
+	brcm_pcie_bridge_sw_init_set(pcie, 0);
+
+	tmp = readl(base + PCIE_MISC_HARD_PCIE_HARD_DEBUG);
+	tmp &= ~PCIE_MISC_HARD_PCIE_HARD_DEBUG_SERDES_IDDQ_MASK;
+	writel(tmp, base + PCIE_MISC_HARD_PCIE_HARD_DEBUG);
+	/* Wait for SerDes to be stable */
+	udelay(150);
+
+	/* Set SCB_MAX_BURST_SIZE, CFG_READ_UR_MODE, SCB_ACCESS_EN */
+	u32p_replace_bits(&tmp, 1, PCIE_MISC_MISC_CTRL_SCB_ACCESS_EN_MASK);
+	u32p_replace_bits(&tmp, 1, PCIE_MISC_MISC_CTRL_CFG_READ_UR_MODE_MASK);
+	u32p_replace_bits(&tmp, PCIE_MISC_MISC_CTRL_MAX_BURST_SIZE_128,
+			  PCIE_MISC_MISC_CTRL_MAX_BURST_SIZE_MASK);
+	writel(tmp, base + PCIE_MISC_MISC_CTRL);
+
+	/*
+	 * 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),
+			  PCIE_MISC_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,
+			  PCIE_MISC_MISC_CTRL_SCB0_SIZE_MASK);
+	writel(tmp, base + PCIE_MISC_MISC_CTRL);
+
+	/* Disable the PCIe->GISB memory window (RC_BAR1) */
+	tmp = readl(base + PCIE_MISC_RC_BAR1_CONFIG_LO);
+	tmp &= ~PCIE_MISC_RC_BAR1_CONFIG_LO_SIZE_MASK;
+	writel(tmp, base + PCIE_MISC_RC_BAR1_CONFIG_LO);
+
+	/* Disable the PCIe->SCB memory window (RC_BAR3) */
+	tmp = readl(base + PCIE_MISC_RC_BAR3_CONFIG_LO);
+	tmp &= ~PCIE_MISC_RC_BAR3_CONFIG_LO_SIZE_MASK;
+	writel(tmp, base + PCIE_MISC_RC_BAR3_CONFIG_LO);
+
+	/* 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 */
+	brcm_pcie_perst_set(pcie, 0);
+
+	/* 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)
+		msleep(5);
+
+	if (!brcm_pcie_link_up(pcie)) {
+		printf("PCIe BRCM: link down\n");
+		return -ENODEV;
+	}
+
+	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).
+	 */
+	tmp = readl(base + PCIE_RC_CFG_PRIV1_ID_VAL3);
+	u32p_replace_bits(&tmp, 0x060400,
+			  PCIE_RC_CFG_PRIV1_ID_VAL3_CLASS_CODE_MASK);
+	writel(tmp, base + PCIE_RC_CFG_PRIV1_ID_VAL3);
+
+	if (pcie->ssc) {
+		ret = brcm_pcie_set_ssc(pcie);
+		if (ret == 0)
+			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 = FIELD_GET(PCI_EXP_LNKSTA_CLS, lnksta);
+	nlw = FIELD_GET(PCI_EXP_LNKSTA_NLW, lnksta);
+
+	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 */
+	tmp = readl(base + PCIE_RC_CFG_VENDOR_VENDOR_SPECIFIC_REG1);
+	u32p_replace_bits(&tmp, PCIE_RC_CFG_VENDOR_SPCIFIC_REG1_LITTLE_ENDIAN,
+		PCIE_RC_CFG_VENDOR_VENDOR_SPECIFIC_REG1_ENDIAN_MODE_BAR2_MASK);
+	writel(tmp, base + PCIE_RC_CFG_VENDOR_VENDOR_SPECIFIC_REG1);
+
+	/*
+	 * Refclk from RC should be gated with CLKREQ# input when ASPM L0s,L1
+	 * is enabled => setting the CLKREQ_DEBUG_ENABLE field to 1.
+	 */
+	tmp = readl(base + PCIE_MISC_HARD_PCIE_HARD_DEBUG);
+	tmp |= PCIE_MISC_HARD_PCIE_HARD_DEBUG_CLKREQ_DEBUG_ENABLE_MASK;
+	writel(tmp, base + PCIE_MISC_HARD_PCIE_HARD_DEBUG);
+
+	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),
+};

Places

File 0029-pci-Add-driver-for-Broadcom-STB-PCI.patch of Package u-boot (Revision 6590d10cd21f7ac73b9ef7f842063e2a)

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