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From: Sylwester Nawrocki <s.nawrocki@samsung.com>
To: u-boot@lists.denx.de
Subject: [PATCH v3 8/9] pci: Add driver for Broadcom BCM2711 SoC PCIe controller
Date: Tue, 12 May 2020 20:47:15 +0200	[thread overview]
Message-ID: <20200512184716.2869-9-s.nawrocki@samsung.com> (raw)
In-Reply-To: <20200512184716.2869-1-s.nawrocki@samsung.com>

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 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@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@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

  parent reply	other threads:[~2020-05-12 18:47 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <CGME20200512184724eucas1p24bb9730834234cebf5061a614c2c8c54@eucas1p2.samsung.com>
2020-05-12 18:47 ` [PATCH v3 0/9] USB host support for Raspberry Pi 4 board (64-bit) Sylwester Nawrocki
     [not found]   ` <CGME20200512184740eucas1p2912f07b9e34cc769604d641adb0e13c9@eucas1p2.samsung.com>
2020-05-12 18:47     ` [PATCH v3 1/9] usb: xhci: Add missing cache flush in the scratchpad array initialization Sylwester Nawrocki
     [not found]   ` <CGME20200512184743eucas1p28e9d93ba5e46ed900a88bf0bf85fda58@eucas1p2.samsung.com>
2020-05-12 18:47     ` [PATCH v3 2/9] usb: xhci: Use only 32-bit accesses in xhci_writeq/xhci_readq Sylwester Nawrocki
     [not found]   ` <CGME20200512184747eucas1p25ed7fb872416271dd34806ccfb4197e5@eucas1p2.samsung.com>
2020-05-12 18:47     ` [PATCH v3 3/9] pci: Move some PCIe register offset definitions to a common header Sylwester Nawrocki
     [not found]   ` <CGME20200512184829eucas1p10c67592f9af7879f51eee9bff8fa76d7@eucas1p1.samsung.com>
2020-05-12 18:47     ` [PATCH v3 4/9] rpi4: shorten a mapping for the DRAM Sylwester Nawrocki
     [not found]   ` <CGME20200512184830eucas1p198b1439122e2da299c563726fe17f9ef@eucas1p1.samsung.com>
2020-05-12 18:47     ` [PATCH v3 5/9] rpi4: add a mapping for the PCIe XHCI controller MMIO registers (ARM 64bit) Sylwester Nawrocki
     [not found]   ` <CGME20200512184832eucas1p1b75fca7f5ed42e3cb38f98410f51f1ad@eucas1p1.samsung.com>
2020-05-12 18:47     ` [PATCH v3 6/9] linux/bitfield.h: Add primitives for manipulating bitfields both in host- and fixed-endian Sylwester Nawrocki
     [not found]       ` <CGME20200512190442eucas1p278509fbc3a5d4bc7303797e5b8b284d6@eucas1p2.samsung.com>
2020-05-12 19:04         ` [RESEND PATCH " Sylwester Nawrocki
     [not found]   ` <CGME20200512184836eucas1p2f357a332cd99d6e287a74405d75c0985@eucas1p2.samsung.com>
2020-05-12 18:47     ` [PATCH v3 7/9] pci: Add some PCI Express capability register offset definitions Sylwester Nawrocki
     [not found]   ` <CGME20200512184838eucas1p249588f9ee76dcb5a10209fcb7de01fae@eucas1p2.samsung.com>
2020-05-12 18:47     ` Sylwester Nawrocki [this message]
     [not found]   ` <CGME20200512184842eucas1p1b2edc2128ddf134553805db77451648f@eucas1p1.samsung.com>
2020-05-12 18:47     ` [PATCH v3 9/9] configs: Enable support for the XHCI controller on RPI4 board (ARM 64-bit) Sylwester Nawrocki
2020-05-13  9:21       ` Sylwester Nawrocki
2020-05-24 18:30         ` Matthias Brugger
2020-05-25  9:25           ` Sylwester Nawrocki

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