--- /dev/null
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (C) 2009 - 2017 Broadcom */
+
+#include <linux/clk.h>
+#include <linux/compiler.h>
+#include <linux/delay.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/ioport.h>
+#include <linux/irqdomain.h>
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/log2.h>
+#include <linux/module.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+#include <linux/of_pci.h>
+#include <linux/of_platform.h>
+#include <linux/pci.h>
+#include <linux/printk.h>
+#include <linux/sizes.h>
+#include <linux/slab.h>
+#include <soc/brcmstb/memory_api.h>
+#include <linux/string.h>
+#include <linux/types.h>
+#include "../pci.h"
+
+/* BRCM_PCIE_CAP_REGS - Offset for the mandatory capability config regs */
+#define BRCM_PCIE_CAP_REGS 0x00ac
+
+/*
+ * Broadcom Settop Box PCIe Register Offsets. The names are from
+ * the chip's RDB and we use them here so that a script can correlate
+ * this code and the RDB to prevent discrepancies.
+ */
+#define PCIE_RC_CFG_VENDOR_VENDOR_SPECIFIC_REG1 0x0188
+#define PCIE_RC_CFG_PRIV1_ID_VAL3 0x043c
+#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_CPU_2_PCIE_MEM_WIN0_LO 0x400c
+#define PCIE_MISC_CPU_2_PCIE_MEM_WIN0_HI 0x4010
+#define PCIE_MISC_RC_BAR1_CONFIG_LO 0x402c
+#define PCIE_MISC_RC_BAR2_CONFIG_LO 0x4034
+#define PCIE_MISC_RC_BAR2_CONFIG_HI 0x4038
+#define PCIE_MISC_RC_BAR3_CONFIG_LO 0x403c
+#define PCIE_MISC_PCIE_CTRL 0x4064
+#define PCIE_MISC_PCIE_STATUS 0x4068
+#define PCIE_MISC_REVISION 0x406c
+#define PCIE_MISC_CPU_2_PCIE_MEM_WIN0_BASE_LIMIT 0x4070
+#define PCIE_MISC_CPU_2_PCIE_MEM_WIN0_BASE_HI 0x4080
+#define PCIE_MISC_CPU_2_PCIE_MEM_WIN0_LIMIT_HI 0x4084
+#define PCIE_MISC_HARD_PCIE_HARD_DEBUG 0x4204
+#define PCIE_INTR2_CPU_BASE 0x4300
+
+/*
+ * Broadcom Settop Box PCIe Register Field shift and mask info. The
+ * names are from the chip's RDB and we use them here so that a script
+ * can correlate this code and the RDB to prevent discrepancies.
+ */
+#define PCIE_RC_CFG_VENDOR_VENDOR_SPECIFIC_REG1_ENDIAN_MODE_BAR2_MASK 0xc
+#define PCIE_RC_CFG_VENDOR_VENDOR_SPECIFIC_REG1_ENDIAN_MODE_BAR2_SHIFT 0x2
+#define PCIE_RC_CFG_PRIV1_ID_VAL3_CLASS_CODE_MASK 0xffffff
+#define PCIE_RC_CFG_PRIV1_ID_VAL3_CLASS_CODE_SHIFT 0x0
+#define PCIE_MISC_MISC_CTRL_SCB_ACCESS_EN_MASK 0x1000
+#define PCIE_MISC_MISC_CTRL_SCB_ACCESS_EN_SHIFT 0xc
+#define PCIE_MISC_MISC_CTRL_CFG_READ_UR_MODE_MASK 0x2000
+#define PCIE_MISC_MISC_CTRL_CFG_READ_UR_MODE_SHIFT 0xd
+#define PCIE_MISC_MISC_CTRL_MAX_BURST_SIZE_MASK 0x300000
+#define PCIE_MISC_MISC_CTRL_MAX_BURST_SIZE_SHIFT 0x14
+#define PCIE_MISC_MISC_CTRL_SCB0_SIZE_MASK 0xf8000000
+#define PCIE_MISC_MISC_CTRL_SCB0_SIZE_SHIFT 0x1b
+#define PCIE_MISC_MISC_CTRL_SCB1_SIZE_MASK 0x7c00000
+#define PCIE_MISC_MISC_CTRL_SCB1_SIZE_SHIFT 0x16
+#define PCIE_MISC_MISC_CTRL_SCB2_SIZE_MASK 0x1f
+#define PCIE_MISC_MISC_CTRL_SCB2_SIZE_SHIFT 0x0
+#define PCIE_MISC_RC_BAR1_CONFIG_LO_SIZE_MASK 0x1f
+#define PCIE_MISC_RC_BAR1_CONFIG_LO_SIZE_SHIFT 0x0
+#define PCIE_MISC_RC_BAR2_CONFIG_LO_SIZE_MASK 0x1f
+#define PCIE_MISC_RC_BAR2_CONFIG_LO_SIZE_SHIFT 0x0
+#define PCIE_MISC_RC_BAR3_CONFIG_LO_SIZE_MASK 0x1f
+#define PCIE_MISC_RC_BAR3_CONFIG_LO_SIZE_SHIFT 0x0
+#define PCIE_MISC_PCIE_CTRL_PCIE_PERSTB_MASK 0x4
+#define PCIE_MISC_PCIE_CTRL_PCIE_PERSTB_SHIFT 0x2
+#define PCIE_MISC_PCIE_CTRL_PCIE_L23_REQUEST_MASK 0x1
+#define PCIE_MISC_PCIE_CTRL_PCIE_L23_REQUEST_SHIFT 0x0
+#define PCIE_MISC_PCIE_STATUS_PCIE_PORT_MASK 0x80
+#define PCIE_MISC_PCIE_STATUS_PCIE_PORT_SHIFT 0x7
+#define PCIE_MISC_PCIE_STATUS_PCIE_DL_ACTIVE_MASK 0x20
+#define PCIE_MISC_PCIE_STATUS_PCIE_DL_ACTIVE_SHIFT 0x5
+#define PCIE_MISC_PCIE_STATUS_PCIE_PHYLINKUP_MASK 0x10
+#define PCIE_MISC_PCIE_STATUS_PCIE_PHYLINKUP_SHIFT 0x4
+#define PCIE_MISC_PCIE_STATUS_PCIE_LINK_IN_L23_MASK 0x40
+#define PCIE_MISC_PCIE_STATUS_PCIE_LINK_IN_L23_SHIFT 0x6
+#define PCIE_MISC_REVISION_MAJMIN_MASK 0xffff
+#define PCIE_MISC_REVISION_MAJMIN_SHIFT 0
+#define PCIE_MISC_CPU_2_PCIE_MEM_WIN0_BASE_LIMIT_LIMIT_MASK 0xfff00000
+#define PCIE_MISC_CPU_2_PCIE_MEM_WIN0_BASE_LIMIT_LIMIT_SHIFT 0x14
+#define PCIE_MISC_CPU_2_PCIE_MEM_WIN0_BASE_LIMIT_BASE_MASK 0xfff0
+#define PCIE_MISC_CPU_2_PCIE_MEM_WIN0_BASE_LIMIT_BASE_SHIFT 0x4
+#define PCIE_MISC_CPU_2_PCIE_MEM_WIN0_BASE_LIMIT_NUM_MASK_BITS 0xc
+#define PCIE_MISC_CPU_2_PCIE_MEM_WIN0_BASE_HI_BASE_MASK 0xff
+#define PCIE_MISC_CPU_2_PCIE_MEM_WIN0_BASE_HI_BASE_SHIFT 0x0
+#define PCIE_MISC_CPU_2_PCIE_MEM_WIN0_LIMIT_HI_LIMIT_MASK 0xff
+#define PCIE_MISC_CPU_2_PCIE_MEM_WIN0_LIMIT_HI_LIMIT_SHIFT 0x0
+#define PCIE_MISC_HARD_PCIE_HARD_DEBUG_CLKREQ_DEBUG_ENABLE_MASK 0x2
+#define PCIE_MISC_HARD_PCIE_HARD_DEBUG_CLKREQ_DEBUG_ENABLE_SHIFT 0x1
+#define PCIE_MISC_HARD_PCIE_HARD_DEBUG_SERDES_IDDQ_MASK 0x08000000
+#define PCIE_MISC_HARD_PCIE_HARD_DEBUG_SERDES_IDDQ_SHIFT 0x1b
+#define PCIE_RGR1_SW_INIT_1_PERST_MASK 0x1
+#define PCIE_RGR1_SW_INIT_1_PERST_SHIFT 0x0
+
+#define BRCM_NUM_PCIE_OUT_WINS 0x4
+#define BRCM_MAX_SCB 0x4
+
+#define BRCM_MSI_TARGET_ADDR_LT_4GB 0x0fffffffcULL
+#define BRCM_MSI_TARGET_ADDR_GT_4GB 0xffffffffcULL
+
+#define BURST_SIZE_128 0
+#define BURST_SIZE_256 1
+#define BURST_SIZE_512 2
+
+/* Offsets from PCIE_INTR2_CPU_BASE */
+#define STATUS 0x0
+#define SET 0x4
+#define CLR 0x8
+#define MASK_STATUS 0xc
+#define MASK_SET 0x10
+#define MASK_CLR 0x14
+
+#define PCIE_BUSNUM_SHIFT 20
+#define PCIE_SLOT_SHIFT 15
+#define PCIE_FUNC_SHIFT 12
+
+#if defined(__BIG_ENDIAN)
+#define DATA_ENDIAN 2 /* PCIe->DDR inbound traffic */
+#define MMIO_ENDIAN 2 /* CPU->PCIe outbound traffic */
+#else
+#define DATA_ENDIAN 0
+#define MMIO_ENDIAN 0
+#endif
+
+#define MDIO_PORT0 0x0
+#define MDIO_DATA_MASK 0x7fffffff
+#define MDIO_DATA_SHIFT 0x0
+#define MDIO_PORT_MASK 0xf0000
+#define MDIO_PORT_SHIFT 0x16
+#define MDIO_REGAD_MASK 0xffff
+#define MDIO_REGAD_SHIFT 0x0
+#define MDIO_CMD_MASK 0xfff00000
+#define MDIO_CMD_SHIFT 0x14
+#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_EN_SHIFT 0xf
+#define SSC_CNTL_OVRD_VAL_MASK 0x4000
+#define SSC_CNTL_OVRD_VAL_SHIFT 0xe
+#define SSC_STATUS_OFFSET 0x1
+#define SSC_STATUS_SSC_MASK 0x400
+#define SSC_STATUS_SSC_SHIFT 0xa
+#define SSC_STATUS_PLL_LOCK_MASK 0x800
+#define SSC_STATUS_PLL_LOCK_SHIFT 0xb
+
+#define IDX_ADDR(pcie) \
+ ((pcie)->reg_offsets[EXT_CFG_INDEX])
+#define DATA_ADDR(pcie) \
+ ((pcie)->reg_offsets[EXT_CFG_DATA])
+#define PCIE_RGR1_SW_INIT_1(pcie) \
+ ((pcie)->reg_offsets[RGR1_SW_INIT_1])
+
+enum {
+ RGR1_SW_INIT_1,
+ EXT_CFG_INDEX,
+ EXT_CFG_DATA,
+};
+
+enum {
+ RGR1_SW_INIT_1_INIT_MASK,
+ RGR1_SW_INIT_1_INIT_SHIFT,
+ RGR1_SW_INIT_1_PERST_MASK,
+ RGR1_SW_INIT_1_PERST_SHIFT,
+};
+
+enum pcie_type {
+ BCM7425,
+ BCM7435,
+ GENERIC,
+ BCM7278,
+};
+
+struct brcm_window {
+ dma_addr_t pcie_addr;
+ phys_addr_t cpu_addr;
+ dma_addr_t size;
+};
+
+/* Internal PCIe Host Controller Information.*/
+struct brcm_pcie {
+ struct device *dev;
+ void __iomem *base;
+ struct list_head resources;
+ int irq;
+ struct clk *clk;
+ struct pci_bus *root_bus;
+ struct device_node *dn;
+ int id;
+ bool suspended;
+ int num_out_wins;
+ bool ssc;
+ int gen;
+ struct brcm_window out_wins[BRCM_NUM_PCIE_OUT_WINS];
+ unsigned int rev;
+ const int *reg_offsets;
+ const int *reg_field_info;
+ enum pcie_type type;
+};
+
+struct pcie_cfg_data {
+ const int *reg_field_info;
+ const int *offsets;
+ const enum pcie_type type;
+};
+
+static const int pcie_reg_field_info[] = {
+ [RGR1_SW_INIT_1_INIT_MASK] = 0x2,
+ [RGR1_SW_INIT_1_INIT_SHIFT] = 0x1,
+};
+
+static const int pcie_reg_field_info_bcm7278[] = {
+ [RGR1_SW_INIT_1_INIT_MASK] = 0x1,
+ [RGR1_SW_INIT_1_INIT_SHIFT] = 0x0,
+};
+
+static const int pcie_offset_bcm7425[] = {
+ [RGR1_SW_INIT_1] = 0x8010,
+ [EXT_CFG_INDEX] = 0x8300,
+ [EXT_CFG_DATA] = 0x8304,
+};
+
+static const struct pcie_cfg_data bcm7425_cfg = {
+ .reg_field_info = pcie_reg_field_info,
+ .offsets = pcie_offset_bcm7425,
+ .type = BCM7425,
+};
+
+static const int pcie_offsets[] = {
+ [RGR1_SW_INIT_1] = 0x9210,
+ [EXT_CFG_INDEX] = 0x9000,
+ [EXT_CFG_DATA] = 0x9004,
+};
+
+static const struct pcie_cfg_data bcm7435_cfg = {
+ .reg_field_info = pcie_reg_field_info,
+ .offsets = pcie_offsets,
+ .type = BCM7435,
+};
+
+static const struct pcie_cfg_data generic_cfg = {
+ .reg_field_info = pcie_reg_field_info,
+ .offsets = pcie_offsets,
+ .type = GENERIC,
+};
+
+static const int pcie_offset_bcm7278[] = {
+ [RGR1_SW_INIT_1] = 0xc010,
+ [EXT_CFG_INDEX] = 0x9000,
+ [EXT_CFG_DATA] = 0x9004,
+};
+
+static const struct pcie_cfg_data bcm7278_cfg = {
+ .reg_field_info = pcie_reg_field_info_bcm7278,
+ .offsets = pcie_offset_bcm7278,
+ .type = BCM7278,
+};
+
+static void __iomem *brcm_pcie_map_conf(struct pci_bus *bus, unsigned int devfn,
+ int where);
+
+static struct pci_ops brcm_pcie_ops = {
+ .map_bus = brcm_pcie_map_conf,
+ .read = pci_generic_config_read,
+ .write = pci_generic_config_write,
+};
+
+#if defined(CONFIG_MIPS)
+/* Broadcom MIPs HW implicitly does the swapping if necessary */
+#define bcm_readl(a) __raw_readl(a)
+#define bcm_writel(d, a) __raw_writel(d, a)
+#define bcm_readw(a) __raw_readw(a)
+#define bcm_writew(d, a) __raw_writew(d, a)
+#else
+#define bcm_readl(a) readl(a)
+#define bcm_writel(d, a) writel(d, a)
+#define bcm_readw(a) readw(a)
+#define bcm_writew(d, a) writew(d, a)
+#endif
+
+/* These macros extract/insert fields to host controller's register set. */
+#define RD_FLD(base, reg, field) \
+ rd_fld(base + reg, reg##_##field##_MASK, reg##_##field##_SHIFT)
+#define WR_FLD(base, reg, field, val) \
+ wr_fld(base + reg, reg##_##field##_MASK, reg##_##field##_SHIFT, val)
+#define WR_FLD_RB(base, reg, field, val) \
+ wr_fld_rb(base + reg, reg##_##field##_MASK, reg##_##field##_SHIFT, val)
+#define WR_FLD_WITH_OFFSET(base, off, reg, field, val) \
+ wr_fld(base + reg + off, reg##_##field##_MASK, \
+ reg##_##field##_SHIFT, val)
+#define EXTRACT_FIELD(val, reg, field) \
+ ((val & reg##_##field##_MASK) >> reg##_##field##_SHIFT)
+#define INSERT_FIELD(val, reg, field, field_val) \
+ ((val & ~reg##_##field##_MASK) | \
+ (reg##_##field##_MASK & (field_val << reg##_##field##_SHIFT)))
+
+static phys_addr_t scb_size[BRCM_MAX_SCB];
+static int num_memc;
+static int num_pcie;
+static DEFINE_MUTEX(brcm_pcie_lock);
+
+static u32 rd_fld(void __iomem *p, u32 mask, int shift)
+{
+ return (bcm_readl(p) & mask) >> shift;
+}
+
+static void wr_fld(void __iomem *p, u32 mask, int shift, u32 val)
+{
+ u32 reg = bcm_readl(p);
+
+ reg = (reg & ~mask) | ((val << shift) & mask);
+ bcm_writel(reg, p);
+}
+
+static void wr_fld_rb(void __iomem *p, u32 mask, int shift, u32 val)
+{
+ wr_fld(p, mask, shift, val);
+ (void)bcm_readl(p);
+}
+
+static const char *link_speed_to_str(int s)
+{
+ switch (s) {
+ case 1:
+ return "2.5";
+ case 2:
+ return "5.0";
+ case 3:
+ return "8.0";
+ default:
+ break;
+ }
+ return "???";
+}
+
+/*
+ * The roundup_pow_of_two() from log2.h invokes
+ * __roundup_pow_of_two(unsigned long), but we really need a
+ * such a function to take a native u64 since unsigned long
+ * is 32 bits on some configurations. So we provide this helper
+ * function below.
+ */
+static u64 roundup_pow_of_two_64(u64 n)
+{
+ return 1ULL << fls64(n - 1);
+}
+
+/*
+ * 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
+ */
+int 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;
+}
+
+static u32 mdio_form_pkt(int port, int regad, int cmd)
+{
+ u32 pkt = 0;
+
+ 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;
+}
+
+/* negative return value indicates error */
+static int mdio_read(void __iomem *base, u8 port, u8 regad)
+{
+ int tries;
+ u32 data;
+
+ bcm_writel(mdio_form_pkt(port, regad, MDIO_CMD_READ),
+ base + PCIE_RC_DL_MDIO_ADDR);
+ bcm_readl(base + PCIE_RC_DL_MDIO_ADDR);
+
+ data = bcm_readl(base + PCIE_RC_DL_MDIO_RD_DATA);
+ for (tries = 0; !MDIO_RD_DONE(data) && tries < 10; tries++) {
+ udelay(10);
+ data = bcm_readl(base + PCIE_RC_DL_MDIO_RD_DATA);
+ }
+
+ return MDIO_RD_DONE(data)
+ ? (data & MDIO_DATA_MASK) >> MDIO_DATA_SHIFT
+ : -EIO;
+}
+
+/* negative return value indicates error */
+static int mdio_write(void __iomem *base, u8 port, u8 regad, u16 wrdata)
+{
+ int tries;
+ u32 data;
+
+ bcm_writel(mdio_form_pkt(port, regad, MDIO_CMD_WRITE),
+ base + PCIE_RC_DL_MDIO_ADDR);
+ bcm_readl(base + PCIE_RC_DL_MDIO_ADDR);
+ bcm_writel(MDIO_DATA_DONE_MASK | wrdata,
+ base + PCIE_RC_DL_MDIO_WR_DATA);
+
+ data = bcm_readl(base + PCIE_RC_DL_MDIO_WR_DATA);
+ for (tries = 0; !MDIO_WT_DONE(data) && tries < 10; tries++) {
+ udelay(10);
+ data = bcm_readl(base + PCIE_RC_DL_MDIO_WR_DATA);
+ }
+
+ return MDIO_WT_DONE(data) ? 0 : -EIO;
+}
+
+/*
+ * Configures device for Spread Spectrum Clocking (SSC) mode; a negative
+ * return value indicates error.
+ */
+static int set_ssc(void __iomem *base)
+{
+ int tmp;
+ u16 wrdata;
+ int pll, ssc;
+
+ tmp = mdio_write(base, MDIO_PORT0, SET_ADDR_OFFSET, SSC_REGS_ADDR);
+ if (tmp < 0)
+ return tmp;
+
+ tmp = mdio_read(base, MDIO_PORT0, SSC_CNTL_OFFSET);
+ if (tmp < 0)
+ return tmp;
+
+ wrdata = INSERT_FIELD(tmp, SSC_CNTL_OVRD, EN, 1);
+ wrdata = INSERT_FIELD(wrdata, SSC_CNTL_OVRD, VAL, 1);
+ tmp = mdio_write(base, MDIO_PORT0, SSC_CNTL_OFFSET, wrdata);
+ if (tmp < 0)
+ return tmp;
+
+ usleep_range(1000, 2000);
+ tmp = mdio_read(base, MDIO_PORT0, SSC_STATUS_OFFSET);
+ if (tmp < 0)
+ return tmp;
+
+ ssc = EXTRACT_FIELD(tmp, SSC_STATUS, SSC);
+ pll = EXTRACT_FIELD(tmp, SSC_STATUS, PLL_LOCK);
+
+ return (ssc && pll) ? 0 : -EIO;
+}
+
+/* Limits operation to a specific generation (1, 2, or 3) */
+static void set_gen(void __iomem *base, int gen)
+{
+ u32 lnkcap = bcm_readl(base + BRCM_PCIE_CAP_REGS + PCI_EXP_LNKCAP);
+ u16 lnkctl2 = bcm_readw(base + BRCM_PCIE_CAP_REGS + PCI_EXP_LNKCTL2);
+
+ lnkcap = (lnkcap & ~PCI_EXP_LNKCAP_SLS) | gen;
+ bcm_writel(lnkcap, base + BRCM_PCIE_CAP_REGS + PCI_EXP_LNKCAP);
+
+ lnkctl2 = (lnkctl2 & ~0xf) | gen;
+ bcm_writew(lnkctl2, base + BRCM_PCIE_CAP_REGS + PCI_EXP_LNKCTL2);
+}
+
+static void brcm_pcie_set_outbound_win(struct brcm_pcie *pcie,
+ unsigned int win, phys_addr_t cpu_addr,
+ dma_addr_t pcie_addr, dma_addr_t size)
+{
+ void __iomem *base = pcie->base;
+ phys_addr_t cpu_addr_mb, limit_addr_mb;
+ u32 tmp;
+
+ /* Set the base of the pcie_addr window */
+ bcm_writel(lower_32_bits(pcie_addr) + MMIO_ENDIAN,
+ base + PCIE_MISC_CPU_2_PCIE_MEM_WIN0_LO + (win * 8));
+ bcm_writel(upper_32_bits(pcie_addr),
+ base + PCIE_MISC_CPU_2_PCIE_MEM_WIN0_HI + (win * 8));
+
+ cpu_addr_mb = cpu_addr >> 20;
+ limit_addr_mb = (cpu_addr + size - 1) >> 20;
+
+ /* Write the addr base low register */
+ WR_FLD_WITH_OFFSET(base, (win * 4),
+ PCIE_MISC_CPU_2_PCIE_MEM_WIN0_BASE_LIMIT,
+ BASE, cpu_addr_mb);
+ /* Write the addr limit low register */
+ WR_FLD_WITH_OFFSET(base, (win * 4),
+ PCIE_MISC_CPU_2_PCIE_MEM_WIN0_BASE_LIMIT,
+ LIMIT, limit_addr_mb);
+
+ if (pcie->type != BCM7435 && pcie->type != BCM7425) {
+ /* Write the cpu addr high register */
+ tmp = (u32)(cpu_addr_mb >>
+ PCIE_MISC_CPU_2_PCIE_MEM_WIN0_BASE_LIMIT_NUM_MASK_BITS);
+ WR_FLD_WITH_OFFSET(base, (win * 8),
+ PCIE_MISC_CPU_2_PCIE_MEM_WIN0_BASE_HI,
+ BASE, tmp);
+ /* Write the cpu limit high register */
+ tmp = (u32)(limit_addr_mb >>
+ PCIE_MISC_CPU_2_PCIE_MEM_WIN0_BASE_LIMIT_NUM_MASK_BITS);
+ WR_FLD_WITH_OFFSET(base, (win * 8),
+ PCIE_MISC_CPU_2_PCIE_MEM_WIN0_LIMIT_HI,
+ LIMIT, tmp);
+ }
+}
+
+/* Configuration space read/write support */
+static int cfg_index(int busnr, int devfn, int reg)
+{
+ return ((PCI_SLOT(devfn) & 0x1f) << PCIE_SLOT_SHIFT)
+ | ((PCI_FUNC(devfn) & 0x07) << PCIE_FUNC_SHIFT)
+ | (busnr << PCIE_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)
+{
+ void __iomem *base = pcie->base;
+ u32 val = bcm_readl(base + PCIE_MISC_PCIE_STATUS);
+
+ return !!EXTRACT_FIELD(val, PCIE_MISC_PCIE_STATUS, PCIE_PORT);
+}
+
+static bool brcm_pcie_link_up(struct brcm_pcie *pcie)
+{
+ void __iomem *base = pcie->base;
+ u32 val = bcm_readl(base + PCIE_MISC_PCIE_STATUS);
+ u32 dla = EXTRACT_FIELD(val, PCIE_MISC_PCIE_STATUS, PCIE_DL_ACTIVE);
+ u32 plu = EXTRACT_FIELD(val, PCIE_MISC_PCIE_STATUS, PCIE_PHYLINKUP);
+
+ return (dla && plu) ? true : false;
+}
+
+static void __iomem *brcm_pcie_map_conf(struct pci_bus *bus, unsigned int devfn,
+ int where)
+{
+ struct brcm_pcie *pcie = bus->sysdata;
+ void __iomem *base = pcie->base;
+ int idx;
+
+ /* Accesses to the RC go right to the RC registers if slot==0 */
+ if (pci_is_root_bus(bus))
+ return PCI_SLOT(devfn) ? NULL : base + where;
+
+ /* For devices, write to the config space index register */
+ idx = cfg_index(bus->number, devfn, where);
+ bcm_writel(idx, pcie->base + IDX_ADDR(pcie));
+ return base + DATA_ADDR(pcie) + (where & 0x3);
+}
+
+static inline void brcm_pcie_bridge_sw_init_set(struct brcm_pcie *pcie,
+ unsigned int val)
+{
+ unsigned int shift = pcie->reg_field_info[RGR1_SW_INIT_1_INIT_SHIFT];
+ u32 mask = pcie->reg_field_info[RGR1_SW_INIT_1_INIT_MASK];
+
+ wr_fld_rb(pcie->base + PCIE_RGR1_SW_INIT_1(pcie), mask, shift, val);
+}
+
+static inline void brcm_pcie_perst_set(struct brcm_pcie *pcie,
+ unsigned int val)
+{
+ if (pcie->type != BCM7278)
+ wr_fld_rb(pcie->base + PCIE_RGR1_SW_INIT_1(pcie),
+ PCIE_RGR1_SW_INIT_1_PERST_MASK,
+ PCIE_RGR1_SW_INIT_1_PERST_SHIFT, val);
+ else
+ /* Assert = 0, de-assert = 1 on 7278 */
+ WR_FLD_RB(pcie->base, PCIE_MISC_PCIE_CTRL, PCIE_PERSTB, !val);
+}
+
+static int brcm_pcie_add_controller(struct brcm_pcie *pcie)
+{
+ int i, ret = 0;
+
+ mutex_lock(&brcm_pcie_lock);
+ if (num_pcie > 0) {
+ num_pcie++;
+ goto done;
+ }
+
+ /* Determine num_memc and their sizes */
+ for (i = 0, num_memc = 0; i < BRCM_MAX_SCB; i++) {
+ u64 size = brcmstb_memory_memc_size(i);
+
+ if (size == (u64)-1) {
+ dev_err(pcie->dev, "cannot get memc%d size\n", i);
+ ret = -EINVAL;
+ goto done;
+ } else if (size) {
+ scb_size[i] = roundup_pow_of_two_64(size);
+ num_memc++;
+ } else {
+ break;
+ }
+ }
+ if (!ret && num_memc == 0) {
+ ret = -EINVAL;
+ goto done;
+ }
+
+ num_pcie++;
+done:
+ mutex_unlock(&brcm_pcie_lock);
+ return ret;
+}
+
+static void brcm_pcie_remove_controller(struct brcm_pcie *pcie)
+{
+ mutex_lock(&brcm_pcie_lock);
+ if (--num_pcie == 0)
+ num_memc = 0;
+ mutex_unlock(&brcm_pcie_lock);
+}
+
+static int brcm_pcie_parse_request_of_pci_ranges(struct brcm_pcie *pcie)
+{
+ struct resource_entry *win;
+ int ret;
+
+ ret = devm_of_pci_get_host_bridge_resources(pcie->dev, 0, 0xff,
+ &pcie->resources, NULL);
+ if (ret) {
+ dev_err(pcie->dev, "failed to get host resources\n");
+ return ret;
+ }
+
+ resource_list_for_each_entry(win, &pcie->resources) {
+ struct resource *parent, *res = win->res;
+ dma_addr_t offset = (dma_addr_t)win->offset;
+
+ if (resource_type(res) == IORESOURCE_IO) {
+ parent = &ioport_resource;
+ } else if (resource_type(res) == IORESOURCE_MEM) {
+ if (pcie->num_out_wins >= BRCM_NUM_PCIE_OUT_WINS) {
+ dev_err(pcie->dev, "too many outbound wins\n");
+ return -EINVAL;
+ }
+ pcie->out_wins[pcie->num_out_wins].cpu_addr
+ = (phys_addr_t)res->start;
+ pcie->out_wins[pcie->num_out_wins].pcie_addr
+ = (dma_addr_t)(res->start
+ - (phys_addr_t)offset);
+ pcie->out_wins[pcie->num_out_wins].size
+ = (dma_addr_t)(res->end - res->start + 1);
+ pcie->num_out_wins++;
+ parent = &iomem_resource;
+ } else {
+ continue;
+ }
+
+ ret = devm_request_resource(pcie->dev, parent, res);
+ if (ret) {
+ dev_err(pcie->dev, "failed to get res %pR\n", res);
+ return ret;
+ }
+ }
+ return 0;
+}
+
+static int brcm_pcie_setup(struct brcm_pcie *pcie)
+{
+ void __iomem *base = pcie->base;
+ unsigned int scb_size_val;
+ u64 rc_bar2_offset, rc_bar2_size, total_mem_size = 0;
+ u32 tmp, burst;
+ int i, j, ret, limit;
+ u16 nlw, cls, lnksta;
+ bool ssc_good = false;
+ struct device *dev = pcie->dev;
+
+ /* Reset the bridge */
+ brcm_pcie_bridge_sw_init_set(pcie, 1);
+
+ /*
+ * Ensure that the fundamental reset is asserted, except for 7278,
+ * which fails if we do this.
+ */
+ if (pcie->type != BCM7278)
+ brcm_pcie_perst_set(pcie, 1);
+
+ usleep_range(100, 200);
+
+ /* Take the bridge out of reset */
+ brcm_pcie_bridge_sw_init_set(pcie, 0);
+
+ WR_FLD_RB(base, PCIE_MISC_HARD_PCIE_HARD_DEBUG, SERDES_IDDQ, 0);
+ /* Wait for SerDes to be stable */
+ usleep_range(100, 200);
+
+ /* Grab the PCIe hw revision number */
+ tmp = bcm_readl(base + PCIE_MISC_REVISION);
+ pcie->rev = EXTRACT_FIELD(tmp, PCIE_MISC_REVISION, MAJMIN);
+
+ /* Set SCB_MAX_BURST_SIZE, CFG_READ_UR_MODE, SCB_ACCESS_EN */
+ tmp = INSERT_FIELD(0, PCIE_MISC_MISC_CTRL, SCB_ACCESS_EN, 1);
+ tmp = INSERT_FIELD(tmp, PCIE_MISC_MISC_CTRL, CFG_READ_UR_MODE, 1);
+ burst = (pcie->type == GENERIC || pcie->type == BCM7278)
+ ? BURST_SIZE_512 : BURST_SIZE_256;
+ tmp = INSERT_FIELD(tmp, PCIE_MISC_MISC_CTRL, MAX_BURST_SIZE, burst);
+ bcm_writel(tmp, base + PCIE_MISC_MISC_CTRL);
+
+ /*
+ * Set up inbound memory view for the EP (called RC_BAR2,
+ * not to be confused with the BARs that are advertised by
+ * the EP).
+ */
+ for (i = 0; i < num_memc; i++)
+ total_mem_size += scb_size[i];
+
+ /*
+ * The PCIe host controller by design must set the inbound
+ * viewport to be a contiguous arrangement of all of the
+ * system's memory. In addition, its size mut be a power of
+ * two. To further complicate matters, the viewport must
+ * start on a pcie-address that is aligned on a multiple of its
+ * size. If a portion of the viewport does not represent
+ * system memory -- e.g. 3GB of memory requires a 4GB viewport
+ * -- we can map the outbound memory in or after 3GB and even
+ * though the viewport will overlap the outbound memory the
+ * controller will know to send outbound memory downstream and
+ * everything else upstream.
+ */
+ rc_bar2_size = roundup_pow_of_two_64(total_mem_size);
+
+ /*
+ * Set simple configuration based on memory sizes
+ * only. We always start the viewport at address 0.
+ */
+ rc_bar2_offset = 0;
+
+ tmp = lower_32_bits(rc_bar2_offset);
+ tmp = INSERT_FIELD(tmp, PCIE_MISC_RC_BAR2_CONFIG_LO, SIZE,
+ encode_ibar_size(rc_bar2_size));
+ bcm_writel(tmp, base + PCIE_MISC_RC_BAR2_CONFIG_LO);
+ bcm_writel(upper_32_bits(rc_bar2_offset),
+ base + PCIE_MISC_RC_BAR2_CONFIG_HI);
+
+ scb_size_val = scb_size[0]
+ ? ilog2(scb_size[0]) - 15 : 0xf; /* 0xf is 1GB */
+ WR_FLD(base, PCIE_MISC_MISC_CTRL, SCB0_SIZE, scb_size_val);
+
+ if (num_memc > 1) {
+ scb_size_val = scb_size[1]
+ ? ilog2(scb_size[1]) - 15 : 0xf; /* 0xf is 1GB */
+ WR_FLD(base, PCIE_MISC_MISC_CTRL, SCB1_SIZE, scb_size_val);
+ }
+
+ if (num_memc > 2) {
+ scb_size_val = scb_size[2]
+ ? ilog2(scb_size[2]) - 15 : 0xf; /* 0xf is 1GB */
+ WR_FLD(base, PCIE_MISC_MISC_CTRL, SCB2_SIZE, scb_size_val);
+ }
+
+ /* disable the PCIe->GISB memory window (RC_BAR1) */
+ WR_FLD(base, PCIE_MISC_RC_BAR1_CONFIG_LO, SIZE, 0);
+
+ /* disable the PCIe->SCB memory window (RC_BAR3) */
+ WR_FLD(base, PCIE_MISC_RC_BAR3_CONFIG_LO, SIZE, 0);
+
+ if (!pcie->suspended) {
+ /* clear any interrupts we find on boot */
+ bcm_writel(0xffffffff, base + PCIE_INTR2_CPU_BASE + CLR);
+ (void)bcm_readl(base + PCIE_INTR2_CPU_BASE + CLR);
+ }
+
+ /* Mask all interrupts since we are not handling any yet */
+ bcm_writel(0xffffffff, base + PCIE_INTR2_CPU_BASE + MASK_SET);
+ (void)bcm_readl(base + PCIE_INTR2_CPU_BASE + MASK_SET);
+
+ if (pcie->gen)
+ set_gen(base, 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
+ * when we don't know if the device is there, and up to 1000ms if
+ * we do know the device is there.
+ */
+ limit = pcie->suspended ? 1000 : 100;
+ for (i = 1, j = 0; j < limit && !brcm_pcie_link_up(pcie);
+ j += i, i = i * 2)
+ msleep(i + j > limit ? limit - j : i);
+
+ if (!brcm_pcie_link_up(pcie)) {
+ dev_info(dev, "link down\n");
+ return -ENODEV;
+ }
+
+ if (!brcm_pcie_rc_mode(pcie)) {
+ dev_err(dev, "PCIe misconfigured; is in EP mode\n");
+ return -EINVAL;
+ }
+
+ for (i = 0; i < pcie->num_out_wins; i++)
+ brcm_pcie_set_outbound_win(pcie, i, pcie->out_wins[i].cpu_addr,
+ pcie->out_wins[i].pcie_addr,
+ pcie->out_wins[i].size);
+
+ /*
+ * For config space accesses on the RC, show the right class for
+ * a PCIe-PCIe bridge (the default setting is to be EP mode).
+ */
+ WR_FLD_RB(base, PCIE_RC_CFG_PRIV1_ID_VAL3, CLASS_CODE, 0x060400);
+
+ if (pcie->ssc) {
+ ret = set_ssc(base);
+ if (ret == 0)
+ ssc_good = true;
+ else
+ dev_err(dev, "failed attempt to enter ssc mode\n");
+ }
+
+ lnksta = bcm_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;
+ dev_info(dev, "link up, %s Gbps x%u %s\n", link_speed_to_str(cls),
+ nlw, ssc_good ? "(SSC)" : "(!SSC)");
+
+ /* PCIe->SCB endian mode for BAR */
+ /* field ENDIAN_MODE_BAR2 = DATA_ENDIAN */
+ WR_FLD_RB(base, PCIE_RC_CFG_VENDOR_VENDOR_SPECIFIC_REG1,
+ ENDIAN_MODE_BAR2, DATA_ENDIAN);
+
+ /*
+ * Refclk from RC should be gated with CLKREQ# input when ASPM L0s,L1
+ * is enabled => setting the CLKREQ_DEBUG_ENABLE field to 1.
+ */
+ WR_FLD_RB(base, PCIE_MISC_HARD_PCIE_HARD_DEBUG, CLKREQ_DEBUG_ENABLE, 1);
+
+ return 0;
+}
+
+/* L23 is a low-power PCIe link state */
+static void enter_l23(struct brcm_pcie *pcie)
+{
+ void __iomem *base = pcie->base;
+ int tries, l23;
+
+ /* assert request for L23 */
+ WR_FLD_RB(base, PCIE_MISC_PCIE_CTRL, PCIE_L23_REQUEST, 1);
+ /* poll L23 status */
+ for (tries = 0, l23 = 0; tries < 1000 && !l23; tries++)
+ l23 = RD_FLD(base, PCIE_MISC_PCIE_STATUS, PCIE_LINK_IN_L23);
+ if (!l23)
+ dev_err(pcie->dev, "failed to enter L23\n");
+}
+
+static void turn_off(struct brcm_pcie *pcie)
+{
+ void __iomem *base = pcie->base;
+
+ if (brcm_pcie_link_up(pcie))
+ enter_l23(pcie);
+ /* Assert fundamental reset */
+ brcm_pcie_perst_set(pcie, 1);
+ /* Deassert request for L23 in case it was asserted */
+ WR_FLD_RB(base, PCIE_MISC_PCIE_CTRL, PCIE_L23_REQUEST, 0);
+ /* Turn off SerDes */
+ WR_FLD_RB(base, PCIE_MISC_HARD_PCIE_HARD_DEBUG, SERDES_IDDQ, 1);
+ /* Shutdown PCIe bridge */
+ brcm_pcie_bridge_sw_init_set(pcie, 1);
+}
+
+static int brcm_pcie_suspend(struct device *dev)
+{
+ struct brcm_pcie *pcie = dev_get_drvdata(dev);
+
+ turn_off(pcie);
+ clk_disable_unprepare(pcie->clk);
+ pcie->suspended = true;
+
+ return 0;
+}
+
+static int brcm_pcie_resume(struct device *dev)
+{
+ struct brcm_pcie *pcie = dev_get_drvdata(dev);
+ void __iomem *base;
+ int ret;
+
+ base = pcie->base;
+ clk_prepare_enable(pcie->clk);
+
+ /* Take bridge out of reset so we can access the SerDes reg */
+ brcm_pcie_bridge_sw_init_set(pcie, 0);
+
+ /* Turn on SerDes */
+ WR_FLD_RB(base, PCIE_MISC_HARD_PCIE_HARD_DEBUG, SERDES_IDDQ, 0);
+ /* Wait for SerDes to be stable */
+ usleep_range(100, 200);
+
+ ret = brcm_pcie_setup(pcie);
+ if (ret)
+ return ret;
+
+ pcie->suspended = false;
+
+ return 0;
+}
+
+static void _brcm_pcie_remove(struct brcm_pcie *pcie)
+{
+ turn_off(pcie);
+ clk_disable_unprepare(pcie->clk);
+ clk_put(pcie->clk);
+ brcm_pcie_remove_controller(pcie);
+}
+
+static int brcm_pcie_remove(struct platform_device *pdev)
+{
+ struct brcm_pcie *pcie = platform_get_drvdata(pdev);
+
+ pci_stop_root_bus(pcie->root_bus);
+ pci_remove_root_bus(pcie->root_bus);
+ _brcm_pcie_remove(pcie);
+
+ return 0;
+}
+
+static const struct of_device_id brcm_pcie_match[] = {
+ { .compatible = "brcm,bcm7425-pcie", .data = &bcm7425_cfg },
+ { .compatible = "brcm,bcm7435-pcie", .data = &bcm7435_cfg },
+ { .compatible = "brcm,bcm7278-pcie", .data = &bcm7278_cfg },
+ { .compatible = "brcm,bcm7445-pcie", .data = &generic_cfg },
+ {},
+};
+MODULE_DEVICE_TABLE(of, brcm_pcie_match);
+
+static int brcm_pcie_probe(struct platform_device *pdev)
+{
+ struct device_node *dn = pdev->dev.of_node;
+ const struct of_device_id *of_id;
+ const struct pcie_cfg_data *data;
+ int ret;
+ struct brcm_pcie *pcie;
+ struct resource *res;
+ void __iomem *base;
+ u32 tmp;
+ struct pci_host_bridge *bridge;
+ struct pci_bus *child;
+
+ bridge = devm_pci_alloc_host_bridge(&pdev->dev, sizeof(*pcie));
+ if (!bridge)
+ return -ENOMEM;
+
+ pcie = pci_host_bridge_priv(bridge);
+ INIT_LIST_HEAD(&pcie->resources);
+
+ of_id = of_match_node(brcm_pcie_match, dn);
+ if (!of_id) {
+ dev_err(&pdev->dev, "failed to look up compatible string\n");
+ return -EINVAL;
+ }
+
+ if (of_property_read_u32(dn, "dma-ranges", &tmp) == 0) {
+ dev_err(&pdev->dev, "cannot yet handle dma-ranges\n");
+ return -EINVAL;
+ }
+
+ data = of_id->data;
+ pcie->reg_offsets = data->offsets;
+ pcie->reg_field_info = data->reg_field_info;
+ pcie->type = data->type;
+ pcie->dn = dn;
+ pcie->dev = &pdev->dev;
+
+ /* We use the domain number as our controller number */
+ pcie->id = of_get_pci_domain_nr(dn);
+ if (pcie->id < 0)
+ return pcie->id;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res)
+ return -EINVAL;
+
+ base = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(base))
+ return PTR_ERR(base);
+
+ pcie->clk = of_clk_get_by_name(dn, "sw_pcie");
+ if (IS_ERR(pcie->clk)) {
+ dev_err(&pdev->dev, "could not get clock\n");
+ pcie->clk = NULL;
+ }
+ pcie->base = base;
+
+ ret = of_pci_get_max_link_speed(dn);
+ pcie->gen = (ret < 0) ? 0 : ret;
+
+ pcie->ssc = of_property_read_bool(dn, "brcm,enable-ssc");
+
+ ret = irq_of_parse_and_map(pdev->dev.of_node, 0);
+ if (ret == 0)
+ /* keep going, as we don't use this intr yet */
+ dev_warn(pcie->dev, "cannot get PCIe interrupt\n");
+ else
+ pcie->irq = ret;
+
+ ret = brcm_pcie_parse_request_of_pci_ranges(pcie);
+ if (ret)
+ return ret;
+
+ ret = clk_prepare_enable(pcie->clk);
+ if (ret) {
+ dev_err(&pdev->dev, "could not enable clock\n");
+ return ret;
+ }
+
+ ret = brcm_pcie_add_controller(pcie);
+ if (ret)
+ return ret;
+
+ ret = brcm_pcie_setup(pcie);
+ if (ret)
+ goto fail;
+
+ list_splice_init(&pcie->resources, &bridge->windows);
+ bridge->dev.parent = &pdev->dev;
+ bridge->busnr = 0;
+ bridge->ops = &brcm_pcie_ops;
+ bridge->sysdata = pcie;
+ bridge->map_irq = of_irq_parse_and_map_pci;
+ bridge->swizzle_irq = pci_common_swizzle;
+
+ ret = pci_scan_root_bus_bridge(bridge);
+ if (ret < 0) {
+ dev_err(pcie->dev, "Scanning root bridge failed\n");
+ goto fail;
+ }
+
+ pci_assign_unassigned_bus_resources(bridge->bus);
+ list_for_each_entry(child, &bridge->bus->children, node)
+ pcie_bus_configure_settings(child);
+ pci_bus_add_devices(bridge->bus);
+ platform_set_drvdata(pdev, pcie);
+ pcie->root_bus = bridge->bus;
+
+ return 0;
+
+fail:
+ _brcm_pcie_remove(pcie);
+ return ret;
+}
+
+static const struct dev_pm_ops brcm_pcie_pm_ops = {
+ .suspend_noirq = brcm_pcie_suspend,
+ .resume_noirq = brcm_pcie_resume,
+};
+
+static struct platform_driver brcm_pcie_driver = {
+ .probe = brcm_pcie_probe,
+ .remove = brcm_pcie_remove,
+ .driver = {
+ .name = "brcm-pcie",
+ .owner = THIS_MODULE,
+ .of_match_table = brcm_pcie_match,
+ .pm = &brcm_pcie_pm_ops,
+ },
+};
+
+module_platform_driver(brcm_pcie_driver);
+
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("Broadcom STB PCIe RC driver");
+MODULE_AUTHOR("Broadcom");
projects / platform / kernel / linux-rpi.git / commitdiff