[PATCH v1 09/10] pci: Add driver for Broadcom STB PCIe controller
Sylwester Nawrocki
s.nawrocki at samsung.com
Fri Apr 24 18:50:11 CEST 2020
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 at suse.de>
Signed-off-by: Sylwester Nawrocki <s.nawrocki at samsung.com>
---
Changes since RFC:
- reworked to align with current Linux mainline version and u-boot driver
by Nicolas Saenz Julienne
---
drivers/pci/Kconfig | 6 +
drivers/pci/Makefile | 1 +
drivers/pci/pcie_brcmstb.c | 593 +++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 600 insertions(+)
create mode 100644 drivers/pci/pcie_brcmstb.c
diff --git a/drivers/pci/Kconfig b/drivers/pci/Kconfig
index 437cd9a..056a021 100644
--- a/drivers/pci/Kconfig
+++ b/drivers/pci/Kconfig
@@ -197,4 +197,10 @@ 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 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..dfe9833
--- /dev/null
+++ b/drivers/pci/pcie_brcmstb.c
@@ -0,0 +1,593 @@
+// 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 <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(const 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(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 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: Use the base address and size(s) provided in the dma-ranges
+ * property.
+ */
+ rc_bar2_offset = 0;
+ rc_bar2_size = 1ULL << 32;
+
+ 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(base);
+ 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),
+};
--
2.7.4
More information about the U-Boot
mailing list