--- /dev/null
+/*
+ * PCIe driver for Marvell MVEBU SoCs
+ *
+ * Based on Barebox drivers/pci/pci-mvebu.c
+ *
+ * Ported to U-Boot by:
+ * Anton Schubert <anton.schubert@gmx.de>
+ * Stefan Roese <sr@denx.de>
+ *
+ * SPDX-License-Identifier: GPL-2.0
+ */
+
+#include <common.h>
+#include <pci.h>
+#include <asm/errno.h>
+#include <asm/io.h>
+#include <asm/arch/cpu.h>
+#include <asm/arch/soc.h>
+#include <linux/mbus.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+/* PCIe unit register offsets */
+#define SELECT(x, n) ((x >> n) & 1UL)
+
+#define PCIE_DEV_ID_OFF 0x0000
+#define PCIE_CMD_OFF 0x0004
+#define PCIE_DEV_REV_OFF 0x0008
+#define PCIE_BAR_LO_OFF(n) (0x0010 + ((n) << 3))
+#define PCIE_BAR_HI_OFF(n) (0x0014 + ((n) << 3))
+#define PCIE_CAPAB_OFF 0x0060
+#define PCIE_CTRL_STAT_OFF 0x0068
+#define PCIE_HEADER_LOG_4_OFF 0x0128
+#define PCIE_BAR_CTRL_OFF(n) (0x1804 + (((n) - 1) * 4))
+#define PCIE_WIN04_CTRL_OFF(n) (0x1820 + ((n) << 4))
+#define PCIE_WIN04_BASE_OFF(n) (0x1824 + ((n) << 4))
+#define PCIE_WIN04_REMAP_OFF(n) (0x182c + ((n) << 4))
+#define PCIE_WIN5_CTRL_OFF 0x1880
+#define PCIE_WIN5_BASE_OFF 0x1884
+#define PCIE_WIN5_REMAP_OFF 0x188c
+#define PCIE_CONF_ADDR_OFF 0x18f8
+#define PCIE_CONF_ADDR_EN BIT(31)
+#define PCIE_CONF_REG(r) ((((r) & 0xf00) << 16) | ((r) & 0xfc))
+#define PCIE_CONF_BUS(b) (((b) & 0xff) << 16)
+#define PCIE_CONF_DEV(d) (((d) & 0x1f) << 11)
+#define PCIE_CONF_FUNC(f) (((f) & 0x7) << 8)
+#define PCIE_CONF_ADDR(dev, reg) \
+ (PCIE_CONF_BUS(PCI_BUS(dev)) | PCIE_CONF_DEV(PCI_DEV(dev)) | \
+ PCIE_CONF_FUNC(PCI_FUNC(dev)) | PCIE_CONF_REG(reg) | \
+ PCIE_CONF_ADDR_EN)
+#define PCIE_CONF_DATA_OFF 0x18fc
+#define PCIE_MASK_OFF 0x1910
+#define PCIE_MASK_ENABLE_INTS (0xf << 24)
+#define PCIE_CTRL_OFF 0x1a00
+#define PCIE_CTRL_X1_MODE BIT(0)
+#define PCIE_STAT_OFF 0x1a04
+#define PCIE_STAT_BUS (0xff << 8)
+#define PCIE_STAT_DEV (0x1f << 16)
+#define PCIE_STAT_LINK_DOWN BIT(0)
+#define PCIE_DEBUG_CTRL 0x1a60
+#define PCIE_DEBUG_SOFT_RESET BIT(20)
+
+struct resource {
+ u32 start;
+ u32 end;
+};
+
+struct mvebu_pcie {
+ struct pci_controller hose;
+ char *name;
+ void __iomem *base;
+ void __iomem *membase;
+ struct resource mem;
+ void __iomem *iobase;
+ u32 port;
+ u32 lane;
+ u32 lane_mask;
+ pci_dev_t dev;
+};
+
+#define to_pcie(_hc) container_of(_hc, struct mvebu_pcie, pci)
+
+/*
+ * MVEBU PCIe controller needs MEMORY and I/O BARs to be mapped
+ * into SoCs address space. Each controller will map 32M of MEM
+ * and 64K of I/O space when registered.
+ */
+static void __iomem *mvebu_pcie_membase = (void __iomem *)MBUS_PCI_MEM_BASE;
+#define PCIE_MEM_SIZE (32 << 20)
+
+#if defined(CONFIG_ARMADA_38X)
+#define PCIE_BASE(if) \
+ ((if) == 0 ? \
+ MVEBU_REG_PCIE_BASE + 0x40000 : \
+ MVEBU_REG_PCIE_BASE + 0x4000 * (if))
+
+/*
+ * On A38x MV6820 these PEX ports are supported:
+ * 0 - Port 0.0
+ * 1 - Port 0.1
+ * 2 - Port 0.2
+ */
+#define MAX_PEX 3
+static struct mvebu_pcie pcie_bus[MAX_PEX];
+
+static void mvebu_get_port_lane(struct mvebu_pcie *pcie, int pex_idx,
+ int *mem_target, int *mem_attr)
+{
+ u8 port[] = { 0, 1, 2 };
+ u8 lane[] = { 0, 0, 0 };
+ u8 target[] = { 8, 4, 4 };
+ u8 attr[] = { 0xe8, 0xe8, 0xd8 };
+
+ pcie->port = port[pex_idx];
+ pcie->lane = lane[pex_idx];
+ *mem_target = target[pex_idx];
+ *mem_attr = attr[pex_idx];
+}
+#else
+#define PCIE_BASE(if) \
+ ((if) < 8 ? \
+ (MVEBU_REG_PCIE_BASE + ((if) / 4) * 0x40000 + ((if) % 4) * 0x4000) : \
+ (MVEBU_REG_PCIE_BASE + 0x2000 + ((if) % 8) * 0x40000))
+
+/*
+ * On AXP MV78460 these PEX ports are supported:
+ * 0 - Port 0.0
+ * 1 - Port 0.1
+ * 2 - Port 0.2
+ * 3 - Port 0.3
+ * 4 - Port 1.0
+ * 5 - Port 1.1
+ * 6 - Port 1.2
+ * 7 - Port 1.3
+ * 8 - Port 2.0
+ * 9 - Port 3.0
+ */
+#define MAX_PEX 10
+static struct mvebu_pcie pcie_bus[MAX_PEX];
+
+static void mvebu_get_port_lane(struct mvebu_pcie *pcie, int pex_idx,
+ int *mem_target, int *mem_attr)
+{
+ u8 port[] = { 0, 0, 0, 0, 1, 1, 1, 1, 2, 3 };
+ u8 lane[] = { 0, 1, 2, 3, 0, 1, 2, 3, 0, 0 };
+ u8 target[] = { 4, 4, 4, 4, 8, 8, 8, 8, 4, 8 };
+ u8 attr[] = { 0xe8, 0xd8, 0xb8, 0x78,
+ 0xe8, 0xd8, 0xb8, 0x78,
+ 0xf8, 0xf8 };
+
+ pcie->port = port[pex_idx];
+ pcie->lane = lane[pex_idx];
+ *mem_target = target[pex_idx];
+ *mem_attr = attr[pex_idx];
+}
+#endif
+
+static inline bool mvebu_pcie_link_up(struct mvebu_pcie *pcie)
+{
+ u32 val;
+ val = readl(pcie->base + PCIE_STAT_OFF);
+ return !(val & PCIE_STAT_LINK_DOWN);
+}
+
+static void mvebu_pcie_set_local_bus_nr(struct mvebu_pcie *pcie, int busno)
+{
+ u32 stat;
+
+ stat = readl(pcie->base + PCIE_STAT_OFF);
+ stat &= ~PCIE_STAT_BUS;
+ stat |= busno << 8;
+ writel(stat, pcie->base + PCIE_STAT_OFF);
+}
+
+static void mvebu_pcie_set_local_dev_nr(struct mvebu_pcie *pcie, int devno)
+{
+ u32 stat;
+
+ stat = readl(pcie->base + PCIE_STAT_OFF);
+ stat &= ~PCIE_STAT_DEV;
+ stat |= devno << 16;
+ writel(stat, pcie->base + PCIE_STAT_OFF);
+}
+
+static int mvebu_pcie_get_local_bus_nr(struct mvebu_pcie *pcie)
+{
+ u32 stat;
+
+ stat = readl(pcie->base + PCIE_STAT_OFF);
+ return (stat & PCIE_STAT_BUS) >> 8;
+}
+
+static int mvebu_pcie_get_local_dev_nr(struct mvebu_pcie *pcie)
+{
+ u32 stat;
+
+ stat = readl(pcie->base + PCIE_STAT_OFF);
+ return (stat & PCIE_STAT_DEV) >> 16;
+}
+
+static inline struct mvebu_pcie *hose_to_pcie(struct pci_controller *hose)
+{
+ return container_of(hose, struct mvebu_pcie, hose);
+}
+
+static int mvebu_pcie_read_config_dword(struct pci_controller *hose,
+ pci_dev_t dev, int offset, u32 *val)
+{
+ struct mvebu_pcie *pcie = hose_to_pcie(hose);
+ int local_bus = PCI_BUS(pcie->dev);
+ int local_dev = PCI_DEV(pcie->dev);
+ u32 reg;
+
+ /* Only allow one other device besides the local one on the local bus */
+ if (PCI_BUS(dev) == local_bus && PCI_DEV(dev) != local_dev) {
+ if (local_dev == 0 && PCI_DEV(dev) != 1) {
+ /*
+ * If local dev is 0, the first other dev can
+ * only be 1
+ */
+ *val = 0xffffffff;
+ return 1;
+ } else if (local_dev != 0 && PCI_DEV(dev) != 0) {
+ /*
+ * If local dev is not 0, the first other dev can
+ * only be 0
+ */
+ *val = 0xffffffff;
+ return 1;
+ }
+ }
+
+ /* write address */
+ reg = PCIE_CONF_ADDR(dev, offset);
+ writel(reg, pcie->base + PCIE_CONF_ADDR_OFF);
+ *val = readl(pcie->base + PCIE_CONF_DATA_OFF);
+
+ return 0;
+}
+
+static int mvebu_pcie_write_config_dword(struct pci_controller *hose,
+ pci_dev_t dev, int offset, u32 val)
+{
+ struct mvebu_pcie *pcie = hose_to_pcie(hose);
+ int local_bus = PCI_BUS(pcie->dev);
+ int local_dev = PCI_DEV(pcie->dev);
+
+ /* Only allow one other device besides the local one on the local bus */
+ if (PCI_BUS(dev) == local_bus && PCI_DEV(dev) != local_dev) {
+ if (local_dev == 0 && PCI_DEV(dev) != 1) {
+ /*
+ * If local dev is 0, the first other dev can
+ * only be 1
+ */
+ return 1;
+ } else if (local_dev != 0 && PCI_DEV(dev) != 0) {
+ /*
+ * If local dev is not 0, the first other dev can
+ * only be 0
+ */
+ return 1;
+ }
+ }
+
+ writel(PCIE_CONF_ADDR(dev, offset), pcie->base + PCIE_CONF_ADDR_OFF);
+ writel(val, pcie->base + PCIE_CONF_DATA_OFF);
+
+ return 0;
+}
+
+/*
+ * Setup PCIE BARs and Address Decode Wins:
+ * BAR[0,2] -> disabled, BAR[1] -> covers all DRAM banks
+ * WIN[0-3] -> DRAM bank[0-3]
+ */
+static void mvebu_pcie_setup_wins(struct mvebu_pcie *pcie)
+{
+ const struct mbus_dram_target_info *dram = mvebu_mbus_dram_info();
+ u32 size;
+ int i;
+
+ /* First, disable and clear BARs and windows. */
+ for (i = 1; i < 3; i++) {
+ writel(0, pcie->base + PCIE_BAR_CTRL_OFF(i));
+ writel(0, pcie->base + PCIE_BAR_LO_OFF(i));
+ writel(0, pcie->base + PCIE_BAR_HI_OFF(i));
+ }
+
+ for (i = 0; i < 5; i++) {
+ writel(0, pcie->base + PCIE_WIN04_CTRL_OFF(i));
+ writel(0, pcie->base + PCIE_WIN04_BASE_OFF(i));
+ writel(0, pcie->base + PCIE_WIN04_REMAP_OFF(i));
+ }
+
+ writel(0, pcie->base + PCIE_WIN5_CTRL_OFF);
+ writel(0, pcie->base + PCIE_WIN5_BASE_OFF);
+ writel(0, pcie->base + PCIE_WIN5_REMAP_OFF);
+
+ /* Setup windows for DDR banks. Count total DDR size on the fly. */
+ size = 0;
+ for (i = 0; i < dram->num_cs; i++) {
+ const struct mbus_dram_window *cs = dram->cs + i;
+
+ writel(cs->base & 0xffff0000,
+ pcie->base + PCIE_WIN04_BASE_OFF(i));
+ writel(0, pcie->base + PCIE_WIN04_REMAP_OFF(i));
+ writel(((cs->size - 1) & 0xffff0000) |
+ (cs->mbus_attr << 8) |
+ (dram->mbus_dram_target_id << 4) | 1,
+ pcie->base + PCIE_WIN04_CTRL_OFF(i));
+
+ size += cs->size;
+ }
+
+ /* Round up 'size' to the nearest power of two. */
+ if ((size & (size - 1)) != 0)
+ size = 1 << fls(size);
+
+ /* Setup BAR[1] to all DRAM banks. */
+ writel(dram->cs[0].base | 0xc, pcie->base + PCIE_BAR_LO_OFF(1));
+ writel(0, pcie->base + PCIE_BAR_HI_OFF(1));
+ writel(((size - 1) & 0xffff0000) | 0x1,
+ pcie->base + PCIE_BAR_CTRL_OFF(1));
+}
+
+void pci_init_board(void)
+{
+ int mem_target, mem_attr, i;
+ int bus = 0;
+ u32 reg;
+ u32 soc_ctrl = readl(MVEBU_SYSTEM_REG_BASE + 0x4);
+
+ /* Check SoC Control Power State */
+ debug("%s: SoC Control %08x, 0en %01lx, 1en %01lx, 2en %01lx\n",
+ __func__, soc_ctrl, SELECT(soc_ctrl, 0), SELECT(soc_ctrl, 1),
+ SELECT(soc_ctrl, 2));
+
+ for (i = 0; i < MAX_PEX; i++) {
+ struct mvebu_pcie *pcie = &pcie_bus[i];
+ struct pci_controller *hose = &pcie->hose;
+
+ /* Get port number, lane number and memory target / attr */
+ mvebu_get_port_lane(pcie, i, &mem_target, &mem_attr);
+
+ /* Don't read at all from pci registers if port power is down */
+ if (pcie->lane == 0 && SELECT(soc_ctrl, pcie->port) == 0) {
+ i += 3;
+ debug("%s: skipping port %d\n", __func__, pcie->port);
+ continue;
+ }
+
+ pcie->base = (void __iomem *)PCIE_BASE(i);
+
+ /* Check link and skip ports that have no link */
+ if (!mvebu_pcie_link_up(pcie)) {
+ debug("%s: PCIe %d.%d - down\n", __func__,
+ pcie->port, pcie->lane);
+ continue;
+ }
+ debug("%s: PCIe %d.%d - up, base %08x\n", __func__,
+ pcie->port, pcie->lane, (u32)pcie->base);
+
+ /* Read Id info and local bus/dev */
+ debug("direct conf read %08x, local bus %d, local dev %d\n",
+ readl(pcie->base), mvebu_pcie_get_local_bus_nr(pcie),
+ mvebu_pcie_get_local_dev_nr(pcie));
+
+ mvebu_pcie_set_local_bus_nr(pcie, bus);
+ mvebu_pcie_set_local_dev_nr(pcie, 0);
+ pcie->dev = PCI_BDF(bus, 0, 0);
+
+ pcie->mem.start = (u32)mvebu_pcie_membase;
+ pcie->mem.end = pcie->mem.start + PCIE_MEM_SIZE - 1;
+ mvebu_pcie_membase += PCIE_MEM_SIZE;
+
+ if (mvebu_mbus_add_window_by_id(mem_target, mem_attr,
+ (phys_addr_t)pcie->mem.start,
+ PCIE_MEM_SIZE)) {
+ printf("PCIe unable to add mbus window for mem at %08x+%08x\n",
+ (u32)pcie->mem.start, PCIE_MEM_SIZE);
+ }
+
+ /* Setup windows and configure host bridge */
+ mvebu_pcie_setup_wins(pcie);
+
+ /* Master + slave enable. */
+ reg = readl(pcie->base + PCIE_CMD_OFF);
+ reg |= PCI_COMMAND_MEMORY;
+ reg |= PCI_COMMAND_MASTER;
+ reg |= BIT(10); /* disable interrupts */
+ writel(reg, pcie->base + PCIE_CMD_OFF);
+
+ /* Setup U-Boot PCI Controller */
+ hose->first_busno = 0;
+ hose->current_busno = bus;
+
+ /* PCI memory space */
+ pci_set_region(hose->regions + 0, pcie->mem.start,
+ pcie->mem.start, PCIE_MEM_SIZE, PCI_REGION_MEM);
+ pci_set_region(hose->regions + 1,
+ 0, 0,
+ gd->ram_size,
+ PCI_REGION_MEM | PCI_REGION_SYS_MEMORY);
+ hose->region_count = 2;
+
+ pci_set_ops(hose,
+ pci_hose_read_config_byte_via_dword,
+ pci_hose_read_config_word_via_dword,
+ mvebu_pcie_read_config_dword,
+ pci_hose_write_config_byte_via_dword,
+ pci_hose_write_config_word_via_dword,
+ mvebu_pcie_write_config_dword);
+ pci_register_hose(hose);
+
+ hose->last_busno = pci_hose_scan(hose);
+
+ /* Set BAR0 to internal registers */
+ writel(SOC_REGS_PHY_BASE, pcie->base + PCIE_BAR_LO_OFF(0));
+ writel(0, pcie->base + PCIE_BAR_HI_OFF(0));
+
+ bus = hose->last_busno + 1;
+ }
+}
projects / oweals / u-boot.git / commitdiff