[RFC PATCH V2 1/4] pci: APM X-Gene PCIe controller driver
Tanmay Inamdar
tinamdar at apm.com
Tue Jan 14 18:34:15 EST 2014
This patch adds the AppliedMicro X-Gene SOC PCIe controller driver.
X-Gene PCIe controller supports maxmum upto 8 lanes and GEN3 speed.
X-Gene has maximum 5 PCIe ports supported.
Signed-off-by: Tanmay Inamdar <tinamdar at apm.com>
---
drivers/pci/host/Kconfig | 10 +
drivers/pci/host/Makefile | 1 +
drivers/pci/host/pci-xgene.c | 934 ++++++++++++++++++++++++++++++++++++++++++
3 files changed, 945 insertions(+)
create mode 100644 drivers/pci/host/pci-xgene.c
diff --git a/drivers/pci/host/Kconfig b/drivers/pci/host/Kconfig
index 47d46c6..19ce97d 100644
--- a/drivers/pci/host/Kconfig
+++ b/drivers/pci/host/Kconfig
@@ -33,4 +33,14 @@ config PCI_RCAR_GEN2
There are 3 internal PCI controllers available with a single
built-in EHCI/OHCI host controller present on each one.
+config PCI_XGENE
+ bool "X-Gene PCIe controller"
+ depends on ARCH_XGENE
+ depends on OF
+ select PCIEPORTBUS
+ help
+ Say Y here if you want internal PCI support on APM X-Gene SoC.
+ There are 5 internal PCIe ports available. Each port is GEN3 capable
+ and have varied lanes from x1 to x8.
+
endmenu
diff --git a/drivers/pci/host/Makefile b/drivers/pci/host/Makefile
index 13fb333..34c7c36 100644
--- a/drivers/pci/host/Makefile
+++ b/drivers/pci/host/Makefile
@@ -4,3 +4,4 @@ obj-$(CONFIG_PCI_IMX6) += pci-imx6.o
obj-$(CONFIG_PCI_MVEBU) += pci-mvebu.o
obj-$(CONFIG_PCI_TEGRA) += pci-tegra.o
obj-$(CONFIG_PCI_RCAR_GEN2) += pci-rcar-gen2.o
+obj-$(CONFIG_PCI_XGENE) += pci-xgene.o
diff --git a/drivers/pci/host/pci-xgene.c b/drivers/pci/host/pci-xgene.c
new file mode 100644
index 0000000..54b2d4f
--- /dev/null
+++ b/drivers/pci/host/pci-xgene.c
@@ -0,0 +1,934 @@
+/**
+ * APM X-Gene PCIe Driver
+ *
+ * Copyright (c) 2013 Applied Micro Circuits Corporation.
+ *
+ * Author: Tanmay Inamdar <tinamdar at apm.com>.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ */
+#include <linux/clk-private.h>
+#include <linux/delay.h>
+#include <linux/io.h>
+#include <linux/jiffies.h>
+#include <linux/memblock.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+#include <linux/of_pci.h>
+#include <linux/pci.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <asm/pcibios.h>
+
+#define PCIECORE_LTSSM 0x4c
+#define PCIECORE_CTLANDSTATUS 0x50
+#define PIPE_PHY_RATE_RD(src) ((0xc000 & (u32)(src)) >> 0xe)
+#define INTXSTATUSMASK 0x6c
+#define PIM1_1L 0x80
+#define IBAR2 0x98
+#define IR2MSK 0x9c
+#define PIM2_1L 0xa0
+#define IBAR3L 0xb4
+#define IR3MSKL 0xbc
+#define PIM3_1L 0xc4
+#define OMR1BARL 0x100
+#define OMR2BARL 0x118
+#define CFGBARL 0x154
+#define CFGBARH 0x158
+#define CFGCTL 0x15c
+#define RTDID 0x160
+#define BRIDGE_CFG_0 0x2000
+#define BRIDGE_CFG_1 0x2004
+#define BRIDGE_CFG_4 0x2010
+#define BRIDGE_CFG_32 0x2030
+#define BRIDGE_CFG_14 0x2038
+#define BRIDGE_8G_CFG_0 0x2100
+#define BRIDGE_8G_CFG_4 0x2110
+#define BRIDGE_8G_CFG_8 0x2120
+#define BRIDGE_8G_CFG_9 0x2124
+#define BRIDGE_8G_CFG_10 0x2128
+#define BRIDGE_8G_CFG_11 0x212c
+#define BRIDGE_CTRL_1 0x2204
+#define BRIDGE_CTRL_2 0x2208
+#define BRIDGE_CTRL_5 0x2214
+#define BRIDGE_STATUS_0 0x2600
+#define MEM_RAM_SHUTDOWN 0xd070
+#define BLOCK_MEM_RDY 0xd074
+
+#define PCI_PRIMARY_BUS_MASK 0x00ffffff
+#define REVISION_ID_MASK 0x000000ff
+#define SLOT_IMPLEMENTED_MASK 0x04000000
+#define DEVICE_PORT_TYPE_MASK 0x03c00000
+#define ADVT_INFINITE_CREDITS 0x00000200
+#define PM_FORCE_RP_MODE_MASK 0x00000400
+#define SWITCH_PORT_MODE_MASK 0x00000800
+#define CLASS_CODE_MASK 0xffffff00
+#define LINK_UP_MASK 0x00000100
+#define AER_OPTIONAL_ERROR_EN 0xffc00000
+#define DWNSTRM_EQ_SKP_PHS_2_3 0x00010000
+#define DIRECT_TO_5GTS_MASK 0x00020000
+#define SUPPORT_5GTS_MASK 0x00010000
+#define DIRECT_TO_8GTS_MASK 0x00008000
+#define SUPPORT_8GTS_MASK 0x00004000
+#define XGENE_PCIE_DEV_CTRL 0x2f0f
+#define AXI_EP_CFG_ACCESS 0x10000
+#define ENABLE_ASPM 0x08000000
+#define XGENE_PORT_TYPE_RC 0x05000000
+#define BLOCK_MEM_RDY_VAL 0xFFFFFFFF
+#define EN_COHERENCY 0xF0000000
+#define EN_REG 0x00000001
+#define OB_LO_IO 0x00000002
+#define XGENE_PCIE_VENDORID 0xE008
+#define XGENE_PCIE_DEVICEID 0xE004
+#define XGENE_PCIE_TIMEOUT (500*1000) /* us */
+#define XGENE_LTSSM_DETECT_WAIT 20
+#define XGENE_LTSSM_L0_WAIT 4
+#define XGENE_PCIE_MAX_PORTS 5
+#define SZ_1T (SZ_1G*1024ULL)
+
+struct xgene_res_cfg {
+ struct resource res;
+ u64 pci_addr;
+};
+
+struct xgene_pcie_port {
+ struct device_node *node;
+ struct xgene_res_cfg mem;
+ struct xgene_res_cfg io;
+ u8 link_up;
+ u8 link_speed;
+ u32 first_busno;
+ void *csr_base;
+ void *cfg_base;
+ u64 cfg_addr;
+ struct device *dev;
+ struct clk *clk;
+};
+
+static inline u32 pcie_bar_low_val(u32 addr, u32 flags)
+{
+ return (addr & PCI_BASE_ADDRESS_MEM_MASK) | flags;
+}
+
+static inline u32 eq_pre_cursor_lane0_set(u32 dst, u32 src)
+{
+ return (dst & ~0xff) | (src & 0xff);
+}
+
+static inline u32 eq_pre_cursor_lane1_set(u32 dst, u32 src)
+{
+ return (dst & ~0xff0000) | ((src << 0x10) & 0xff0000);
+}
+
+static inline struct xgene_pcie_port *
+xgene_pcie_sys_to_port(struct pci_sys_data *sys)
+{
+ return sys->private_data;
+}
+
+static inline struct xgene_pcie_port *
+xgene_pcie_bus_to_port(struct pci_bus *bus)
+{
+ struct pci_sys_data *sys = bus->sysdata;
+ return xgene_pcie_sys_to_port(sys);
+}
+
+/* PCIE Configuration Out/In */
+static inline void xgene_pcie_cfg_out32(void *addr, u32 val)
+{
+ writel(val, addr);
+}
+
+static inline void xgene_pcie_cfg_out16(void *addr, u16 val)
+{
+ u64 temp_addr = (u64) addr & ~0x3;
+ u32 val32 = readl((void *)temp_addr);
+
+ switch ((u64) addr & 0x3) {
+ case 2:
+ val32 &= ~0xFFFF0000;
+ val32 |= (u32) val << 16;
+ break;
+ case 0:
+ default:
+ val32 &= ~0xFFFF;
+ val32 |= val;
+ break;
+ }
+ writel(val32, (void *)temp_addr);
+}
+
+static inline void xgene_pcie_cfg_out8(void *addr, u8 val)
+{
+ phys_addr_t temp_addr = (u64) addr & ~0x3;
+ u32 val32 = readl((void *)temp_addr);
+
+ switch ((u64) addr & 0x3) {
+ case 0:
+ val32 &= ~0xFF;
+ val32 |= val;
+ break;
+ case 1:
+ val32 &= ~0xFF00;
+ val32 |= (u32) val << 8;
+ break;
+ case 2:
+ val32 &= ~0xFF0000;
+ val32 |= (u32) val << 16;
+ break;
+ case 3:
+ default:
+ val32 &= ~0xFF000000;
+ val32 |= (u32) val << 24;
+ break;
+ }
+ writel(val32, (void *)temp_addr);
+}
+
+static inline void xgene_pcie_cfg_in32(void *addr, u32 *val)
+{
+ *val = readl(addr);
+}
+
+static inline void xgene_pcie_cfg_in16(void *addr, u16 *val)
+{
+ u64 temp_addr = (u64)addr & ~0x3;
+ u32 val32;
+
+ val32 = readl((void *)temp_addr);
+
+ switch ((u64)addr & 0x3) {
+ case 2:
+ *val = val32 >> 16;
+ break;
+ case 0:
+ default:
+ *val = val32;
+ break;
+ }
+}
+
+static inline void xgene_pcie_cfg_in8(void *addr, u8 *val)
+{
+ u64 temp_addr = (u64)addr & ~0x3;
+ u32 val32;
+
+ val32 = readl((void *)temp_addr);
+
+ switch ((u64)addr & 0x3) {
+ case 3:
+ *val = val32 >> 24;
+ break;
+ case 2:
+ *val = val32 >> 16;
+ break;
+ case 1:
+ *val = val32 >> 8;
+ break;
+ case 0:
+ default:
+ *val = val32;
+ break;
+ }
+}
+
+/* When the address bit [17:16] is 2'b01, the Configuration access will be
+ * treated as Type 1 and it will be forwarded to external PCIe device.
+ */
+static void __iomem *xgene_pcie_get_cfg_base(struct pci_bus *bus)
+{
+ struct xgene_pcie_port *port = xgene_pcie_bus_to_port(bus);
+ u64 addr = (u64)port->cfg_base;
+
+ if (bus->number >= (port->first_busno + 1))
+ addr |= AXI_EP_CFG_ACCESS;
+
+ return (void *)addr;
+}
+
+/* For Configuration request, RTDID register is used as Bus Number,
+ * Device Number and Function number of the header fields.
+ */
+static void xgene_pcie_set_rtdid_reg(struct pci_bus *bus, uint devfn)
+{
+ struct xgene_pcie_port *port = xgene_pcie_bus_to_port(bus);
+ unsigned int b, d, f;
+ u32 rtdid_val = 0;
+
+ b = bus->number;
+ d = PCI_SLOT(devfn);
+ f = PCI_FUNC(devfn);
+
+ if (bus->number == port->first_busno)
+ rtdid_val = (b << 24) | (d << 19) | (f << 16);
+ else if (bus->number >= (port->first_busno + 1))
+ rtdid_val = (port->first_busno << 24) |
+ (b << 8) | (d << 3) | f;
+
+ writel(rtdid_val, port->csr_base + RTDID);
+ /* read the register back to ensure flush */
+ readl(port->csr_base + RTDID);
+}
+
+static int xgene_pcie_read_config(struct pci_bus *bus, unsigned int devfn,
+ int offset, int len, u32 *val)
+{
+ struct xgene_pcie_port *port = xgene_pcie_bus_to_port(bus);
+ void __iomem *addr;
+ u8 val8;
+ u16 val16;
+
+ if ((pci_is_root_bus(bus) && devfn != 0) || !port->link_up)
+ return PCIBIOS_DEVICE_NOT_FOUND;
+
+ xgene_pcie_set_rtdid_reg(bus, devfn);
+ addr = xgene_pcie_get_cfg_base(bus);
+ switch (len) {
+ case 1:
+ xgene_pcie_cfg_in8(addr + offset, &val8);
+ *val = val8;
+ break;
+ case 2:
+ xgene_pcie_cfg_in16(addr + offset, &val16);
+ *val = val16;
+ break;
+ default:
+ xgene_pcie_cfg_in32(addr + offset, val);
+ break;
+ }
+ return PCIBIOS_SUCCESSFUL;
+}
+
+static int xgene_pcie_write_config(struct pci_bus *bus, unsigned int devfn,
+ int offset, int len, u32 val)
+{
+ struct xgene_pcie_port *port = xgene_pcie_bus_to_port(bus);
+ void __iomem *addr;
+
+ if ((pci_is_root_bus(bus) && devfn != 0) || !port->link_up)
+ return PCIBIOS_DEVICE_NOT_FOUND;
+
+ xgene_pcie_set_rtdid_reg(bus, devfn);
+ addr = xgene_pcie_get_cfg_base(bus);
+ switch (len) {
+ case 1:
+ xgene_pcie_cfg_out8(addr + offset, (u8) val);
+ break;
+ case 2:
+ xgene_pcie_cfg_out16(addr + offset, (u16) val);
+ break;
+ default:
+ xgene_pcie_cfg_out32(addr + offset, val);
+ break;
+ }
+ return PCIBIOS_SUCCESSFUL;
+}
+
+static struct pci_ops xgene_pcie_ops = {
+ .read = xgene_pcie_read_config,
+ .write = xgene_pcie_write_config
+};
+
+static void xgene_pcie_setup_lanes(struct xgene_pcie_port *port)
+{
+ void *csr_base = port->csr_base;
+ u32 val;
+
+ val = readl(csr_base + BRIDGE_8G_CFG_8);
+ val = eq_pre_cursor_lane0_set(val, 0x7);
+ val = eq_pre_cursor_lane1_set(val, 0x7);
+ writel(val, csr_base + BRIDGE_8G_CFG_8);
+
+ val = readl(csr_base + BRIDGE_8G_CFG_9);
+ val = eq_pre_cursor_lane0_set(val, 0x7);
+ val = eq_pre_cursor_lane1_set(val, 0x7);
+ writel(val, csr_base + BRIDGE_8G_CFG_9);
+
+ val = readl(csr_base + BRIDGE_8G_CFG_10);
+ val = eq_pre_cursor_lane0_set(val, 0x7);
+ val = eq_pre_cursor_lane1_set(val, 0x7);
+ writel(val, csr_base + BRIDGE_8G_CFG_10);
+
+ val = readl(csr_base + BRIDGE_8G_CFG_11);
+ val = eq_pre_cursor_lane0_set(val, 0x7);
+ val = eq_pre_cursor_lane1_set(val, 0x7);
+ writel(val, csr_base + BRIDGE_8G_CFG_11);
+
+ val = readl(csr_base + BRIDGE_8G_CFG_4);
+ val = (val & ~0x30) | (1 << 4);
+ writel(val, csr_base + BRIDGE_8G_CFG_4);
+}
+
+static void xgene_pcie_setup_link(struct xgene_pcie_port *port)
+{
+ void *csr_base = port->csr_base;
+ u32 val;
+
+ val = readl(csr_base + BRIDGE_CFG_14);
+ val |= DIRECT_TO_8GTS_MASK;
+ val |= SUPPORT_5GTS_MASK;
+ val |= SUPPORT_8GTS_MASK;
+ val |= DIRECT_TO_5GTS_MASK;
+ writel(val, csr_base + BRIDGE_CFG_14);
+
+ val = readl(csr_base + BRIDGE_CFG_14);
+ val &= ~ADVT_INFINITE_CREDITS;
+ writel(val, csr_base + BRIDGE_CFG_14);
+
+ val = readl(csr_base + BRIDGE_8G_CFG_0);
+ val |= (val & ~0xf) | 7;
+ val |= (val & ~0xf00) | ((7 << 8) & 0xf00);
+ writel(val, csr_base + BRIDGE_8G_CFG_0);
+
+ val = readl(csr_base + BRIDGE_8G_CFG_0);
+ val |= DWNSTRM_EQ_SKP_PHS_2_3;
+ writel(val, csr_base + BRIDGE_8G_CFG_0);
+}
+
+static void xgene_pcie_program_core(void *csr_base)
+{
+ u32 val;
+
+ val = readl(csr_base + BRIDGE_CFG_0);
+ val |= AER_OPTIONAL_ERROR_EN;
+ writel(val, csr_base + BRIDGE_CFG_0);
+ writel(0x0, csr_base + INTXSTATUSMASK);
+ val = readl(csr_base + BRIDGE_CTRL_1);
+ val = (val & ~0xffff) | XGENE_PCIE_DEV_CTRL;
+ writel(val, csr_base + BRIDGE_CTRL_1);
+}
+
+static u64 xgene_pcie_set_ib_mask(void *csr_base, u32 addr, u32 flags, u64 size)
+{
+ u64 mask = (~(size - 1) & PCI_BASE_ADDRESS_MEM_MASK) | flags;
+ u32 val32 = 0;
+ u32 val;
+
+ val32 = readl(csr_base + addr);
+ val = (val32 & 0x0000ffff) | (lower_32_bits(mask) << 16);
+ writel(val, csr_base + addr);
+
+ val32 = readl(csr_base + addr + 0x04);
+ val = (val32 & 0xffff0000) | (lower_32_bits(mask) >> 16);
+ writel(val, csr_base + addr + 0x04);
+
+ val32 = readl(csr_base + addr + 0x04);
+ val = (val32 & 0x0000ffff) | (upper_32_bits(mask) << 16);
+ writel(val, csr_base + addr + 0x04);
+
+ val32 = readl(csr_base + addr + 0x08);
+ val = (val32 & 0xffff0000) | (upper_32_bits(mask) >> 16);
+ writel(val, csr_base + addr + 0x08);
+
+ return mask;
+}
+
+static void xgene_pcie_poll_linkup(struct xgene_pcie_port *port, u32 *lanes)
+{
+ void *csr_base = port->csr_base;
+ u32 val32;
+ u64 start_time, time;
+
+ /*
+ * A component enters the LTSSM Detect state within
+ * 20ms of the end of fundamental core reset.
+ */
+ msleep(XGENE_LTSSM_DETECT_WAIT);
+ port->link_up = 0;
+ start_time = jiffies;
+ do {
+ val32 = readl(csr_base + PCIECORE_CTLANDSTATUS);
+ if (val32 & LINK_UP_MASK) {
+ port->link_up = 1;
+ port->link_speed = PIPE_PHY_RATE_RD(val32);
+ val32 = readl(csr_base + BRIDGE_STATUS_0);
+ *lanes = val32 >> 26;
+ }
+ time = jiffies_to_msecs(jiffies - start_time);
+ } while ((!port->link_up) || (time <= XGENE_LTSSM_L0_WAIT));
+}
+
+static void xgene_pcie_setup_root_complex(struct xgene_pcie_port *port)
+{
+ void *csr_base = port->csr_base;
+ u32 val;
+
+ val = (XGENE_PCIE_DEVICEID << 16) | XGENE_PCIE_VENDORID;
+ writel(val, csr_base + BRIDGE_CFG_0);
+
+ val = readl(csr_base + BRIDGE_CFG_1);
+ val &= ~CLASS_CODE_MASK;
+ val |= PCI_CLASS_BRIDGE_PCI << 16;
+ writel(val, csr_base + BRIDGE_CFG_1);
+
+ val = readl(csr_base + BRIDGE_CFG_14);
+ val |= SWITCH_PORT_MODE_MASK;
+ val &= ~PM_FORCE_RP_MODE_MASK;
+ writel(val, csr_base + BRIDGE_CFG_14);
+ xgene_pcie_setup_link(port);
+ xgene_pcie_setup_lanes(port);
+ val = readl(csr_base + BRIDGE_CTRL_5);
+ val &= ~DEVICE_PORT_TYPE_MASK;
+ val |= XGENE_PORT_TYPE_RC;
+ writel(val, csr_base + BRIDGE_CTRL_5);
+
+ val = readl(csr_base + BRIDGE_CTRL_2);
+ val |= ENABLE_ASPM;
+ writel(val, csr_base + BRIDGE_CTRL_2);
+
+ val = readl(csr_base + BRIDGE_CFG_32);
+ writel(val | (1 << 19), csr_base + BRIDGE_CFG_32);
+}
+
+/* Return 0 on success */
+static int xgene_pcie_init_ecc(struct xgene_pcie_port *port)
+{
+ void *csr_base = port->csr_base;
+ int timeout = XGENE_PCIE_TIMEOUT;
+ u32 val;
+
+ val = readl(csr_base + MEM_RAM_SHUTDOWN);
+ if (val == 0)
+ return 0;
+ writel(0x0, csr_base + MEM_RAM_SHUTDOWN);
+ do {
+ val = readl(csr_base + BLOCK_MEM_RDY);
+ udelay(1);
+ } while ((val != BLOCK_MEM_RDY_VAL) && timeout--);
+
+ return !(timeout > 0);
+}
+
+static int xgene_pcie_init_port(struct xgene_pcie_port *port)
+{
+ int rc;
+
+ port->clk = clk_get(port->dev, NULL);
+ if (IS_ERR_OR_NULL(port->clk)) {
+ dev_err(port->dev, "clock not available\n");
+ return -ENODEV;
+ }
+
+ rc = clk_prepare_enable(port->clk);
+ if (rc) {
+ dev_err(port->dev, "clock enable failed\n");
+ return rc;
+ }
+
+ rc = xgene_pcie_init_ecc(port);
+ if (rc) {
+ dev_err(port->dev, "memory init failed\n");
+ return rc;
+ }
+
+ return 0;
+}
+
+struct device_node *pcibios_get_phb_of_node(struct pci_bus *bus)
+{
+ struct xgene_pcie_port *port = xgene_pcie_bus_to_port(bus);
+
+ return of_node_get(port->node);
+}
+
+static void xgene_pcie_fixup_bridge(struct pci_dev *dev)
+{
+ int i;
+
+ /* Hide the PCI host BARs from the kernel as their content doesn't
+ * fit well in the resource management
+ */
+ for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
+ dev->resource[i].start = dev->resource[i].end = 0;
+ dev->resource[i].flags = 0;
+ }
+ dev_info(&dev->dev, "Hiding X-Gene pci host bridge resources %s\n",
+ pci_name(dev));
+}
+DECLARE_PCI_FIXUP_HEADER(XGENE_PCIE_VENDORID, XGENE_PCIE_DEVICEID,
+ xgene_pcie_fixup_bridge);
+
+static void xgene_pcie_setup_primary_bus(struct xgene_pcie_port *port,
+ u32 first_busno, u32 last_busno)
+{
+ u32 val;
+ void *cfg_addr = port->cfg_base;
+
+ val = readl(cfg_addr + PCI_PRIMARY_BUS);
+ val &= ~PCI_PRIMARY_BUS_MASK;
+ val |= (last_busno << 16) | ((first_busno + 1) << 8) | (first_busno);
+ writel(val, cfg_addr + PCI_PRIMARY_BUS);
+}
+
+/*
+ * read configuration values from DTS
+ */
+static int xgene_pcie_read_dts_config(struct xgene_pcie_port *port)
+{
+ struct device_node *np = port->node;
+ struct resource csr_res;
+ struct resource cfg_res;
+
+ /* Get CSR space registers address */
+ if (of_address_to_resource(np, 0, &csr_res))
+ return -EINVAL;
+
+ port->csr_base = devm_ioremap_nocache(port->dev, csr_res.start,
+ resource_size(&csr_res));
+ if (port->csr_base == NULL)
+ return -ENOMEM;
+
+ /* Get CFG space registers address */
+ if (of_address_to_resource(np, 1, &cfg_res))
+ return -EINVAL;
+
+ port->cfg_addr = cfg_res.start;
+ port->cfg_base = devm_ioremap_nocache(port->dev, cfg_res.start,
+ resource_size(&cfg_res));
+ if (port->csr_base == NULL)
+ return -ENOMEM;
+
+ return 0;
+}
+
+static void xgene_pcie_setup_ob_reg(struct xgene_pcie_port *port,
+ u32 addr, u32 restype)
+{
+ struct resource *res = NULL;
+ void *base = port->csr_base + addr;
+ resource_size_t size;
+ u64 cpu_addr = 0;
+ u64 pci_addr = 0;
+ u64 mask = 0;
+ u32 min_size = 0;
+ u32 flag = EN_REG;
+
+ switch (restype) {
+ case IORESOURCE_MEM:
+ res = &port->mem.res;
+ pci_addr = port->mem.pci_addr;
+ min_size = SZ_128M;
+ break;
+ case IORESOURCE_IO:
+ res = &port->io.res;
+ pci_addr = port->io.pci_addr;
+ min_size = 128;
+ flag |= OB_LO_IO;
+ break;
+ }
+ size = resource_size(res);
+ if (size >= min_size)
+ mask = ~(size - 1) | flag;
+ else
+ dev_warn(port->dev, "res size 0x%llx less than minimum 0x%x\n",
+ (u64)size, min_size);
+ cpu_addr = res->start;
+ writel(lower_32_bits(cpu_addr), base);
+ writel(upper_32_bits(cpu_addr), base + 0x04);
+ writel(lower_32_bits(mask), base + 0x08);
+ writel(upper_32_bits(mask), base + 0x0c);
+ writel(lower_32_bits(pci_addr), base + 0x10);
+ writel(upper_32_bits(pci_addr), base + 0x14);
+}
+
+static void xgene_pcie_setup_cfg_reg(struct xgene_pcie_port *port)
+{
+ void *csr_base = port->csr_base;
+ u64 addr = port->cfg_addr;
+
+ writel(lower_32_bits(addr), csr_base + CFGBARL);
+ writel(upper_32_bits(addr), csr_base + CFGBARH);
+ writel(EN_REG, csr_base + CFGCTL);
+}
+
+static int xgene_pcie_parse_map_ranges(struct xgene_pcie_port *port)
+{
+ struct device_node *np = port->node;
+ struct of_pci_range range;
+ struct of_pci_range_parser parser;
+ struct device *dev = port->dev;
+
+ if (of_pci_range_parser_init(&parser, np)) {
+ dev_err(dev, "missing ranges property\n");
+ return -EINVAL;
+ }
+
+ /* Get the I/O, memory, config ranges from DT */
+ for_each_of_pci_range(&parser, &range) {
+ struct resource *res = NULL;
+ u64 restype = range.flags & IORESOURCE_TYPE_BITS;
+ u64 end = range.cpu_addr + range.size - 1;
+ dev_dbg(port->dev, "0x%08x 0x%016llx..0x%016llx -> 0x%016llx\n",
+ range.flags, range.cpu_addr, end, range.pci_addr);
+
+ switch (restype) {
+ case IORESOURCE_IO:
+ res = &port->io.res;
+ port->io.pci_addr = range.pci_addr;
+ of_pci_range_to_resource(&range, np, res);
+ xgene_pcie_setup_ob_reg(port, OMR1BARL, restype);
+ break;
+ case IORESOURCE_MEM:
+ res = &port->mem.res;
+ port->mem.pci_addr = range.pci_addr;
+ of_pci_range_to_resource(&range, np, res);
+ xgene_pcie_setup_ob_reg(port, OMR2BARL, restype);
+ break;
+ default:
+ dev_err(dev, "invalid io resource!");
+ return -EINVAL;
+ }
+ }
+ xgene_pcie_setup_cfg_reg(port);
+ return 0;
+}
+
+static int pci_dma_range_parser_init(struct of_pci_range_parser *parser,
+ struct device_node *node)
+{
+ const int na = 3, ns = 2;
+ int rlen;
+
+ parser->node = node;
+ parser->pna = of_n_addr_cells(node);
+ parser->np = parser->pna + na + ns;
+
+ parser->range = of_get_property(node, "dma-ranges", &rlen);
+ if (parser->range == NULL)
+ return -ENOENT;
+
+ parser->end = parser->range + rlen / sizeof(__be32);
+
+ return 0;
+}
+
+static void xgene_pcie_setup_pims(void *addr, u64 pim, u64 size)
+{
+ writel(lower_32_bits(pim), addr);
+ writel(upper_32_bits(pim) | EN_COHERENCY, addr + 0x04);
+ writel(lower_32_bits(size), addr + 0x10);
+ writel(upper_32_bits(size), addr + 0x14);
+}
+
+static void xgene_pcie_setup_ib_reg(struct xgene_pcie_port *port,
+ struct of_pci_range *range, u64 restype,
+ u32 region)
+{
+ void *csr_base = port->csr_base;
+ void *cfg_base = port->cfg_base;
+ void *bar_addr;
+ void *pim_addr;
+ u64 cpu_addr = range->cpu_addr;
+ u64 pci_addr = range->pci_addr;
+ u64 size = range->size;
+ u64 mask = ~(size - 1) | EN_REG;
+ u32 flags = PCI_BASE_ADDRESS_MEM_TYPE_64;
+ u32 bar_low;
+
+ if (restype == PCI_BASE_ADDRESS_MEM_PREFETCH)
+ flags |= PCI_BASE_ADDRESS_MEM_PREFETCH;
+
+ bar_low = pcie_bar_low_val((u32)cpu_addr, flags);
+ switch (region) {
+ case 0:
+ xgene_pcie_set_ib_mask(csr_base, BRIDGE_CFG_4, flags, size);
+ bar_addr = cfg_base + PCI_BASE_ADDRESS_0;
+ writel(bar_low, bar_addr);
+ writel(upper_32_bits(cpu_addr), bar_addr + 0x4);
+ pim_addr = csr_base + PIM1_1L;
+ break;
+ case 1:
+ bar_addr = csr_base + IBAR2;
+ writel(bar_low, bar_addr);
+ writel(lower_32_bits(mask), csr_base + IR2MSK);
+ pim_addr = csr_base + PIM2_1L;
+ break;
+ case 2:
+ bar_addr = csr_base + IBAR3L;
+ writel(bar_low, bar_addr);
+ writel(upper_32_bits(cpu_addr), bar_addr + 0x4);
+ writel(lower_32_bits(mask), csr_base + IR3MSKL);
+ writel(upper_32_bits(mask), csr_base + IR3MSKL + 0x4);
+ pim_addr = csr_base + PIM3_1L;
+ break;
+ }
+ xgene_pcie_setup_pims(pim_addr, pci_addr, size);
+}
+
+/* X-Gene PCIe support maximum 3 inbound memory regions
+ * This function helps to select a region based on size of region
+ */
+static int xgene_pcie_select_ib_reg(u64 size)
+{
+ static u8 ib_reg_mask;
+
+ if ((size > 4) && (size < SZ_16M) && !(ib_reg_mask & (1 << 1))) {
+ ib_reg_mask |= (1 << 1);
+ return 1;
+ }
+
+ if ((size > SZ_1K) && (size < SZ_1T) && !(ib_reg_mask & (1 << 0))) {
+ ib_reg_mask |= (1 << 0);
+ return 0;
+ }
+
+ if ((size > SZ_1M) && (size < SZ_1T) && !(ib_reg_mask & (1 << 2))) {
+ ib_reg_mask |= (1 << 2);
+ return 2;
+ }
+ return -EINVAL;
+}
+
+static int xgene_pcie_parse_map_dma_ranges(struct xgene_pcie_port *port)
+{
+ struct device_node *np = port->node;
+ struct of_pci_range range;
+ struct of_pci_range_parser parser;
+ struct device *dev = port->dev;
+ int region;
+
+ if (pci_dma_range_parser_init(&parser, np)) {
+ dev_err(dev, "missing dma-ranges property\n");
+ return -EINVAL;
+ }
+
+ /* Get the dma-ranges from DT */
+ for_each_of_pci_range(&parser, &range) {
+ u64 restype = range.flags & IORESOURCE_TYPE_BITS;
+ u64 end = range.cpu_addr + range.size - 1;
+ dev_dbg(port->dev, "0x%08x 0x%016llx..0x%016llx -> 0x%016llx\n",
+ range.flags, range.cpu_addr, end, range.pci_addr);
+ region = xgene_pcie_select_ib_reg(range.size);
+ if (region == -EINVAL) {
+ dev_warn(port->dev, "invalid pcie dma-range config\n");
+ continue;
+ }
+ xgene_pcie_setup_ib_reg(port, &range, restype, region);
+ }
+ return 0;
+}
+
+static int xgene_pcie_setup(int nr, struct pci_sys_data *sys)
+{
+ struct xgene_pcie_port *pp = xgene_pcie_sys_to_port(sys);
+
+ if (pp == NULL)
+ return 0;
+
+ sys->mem_offset = pp->mem.res.start - pp->mem.pci_addr;
+ pci_add_resource_offset(&sys->resources, &pp->mem.res,
+ sys->mem_offset);
+ return 1;
+}
+
+static struct pci_bus __init *xgene_pcie_scan_bus(int nr,
+ struct pci_sys_data *sys)
+{
+ struct xgene_pcie_port *pp = xgene_pcie_sys_to_port(sys);
+
+ pp->first_busno = sys->busnr;
+ xgene_pcie_setup_primary_bus(pp, sys->busnr, 0xff);
+ return pci_scan_root_bus(NULL, sys->busnr, &xgene_pcie_ops,
+ sys, &sys->resources);
+}
+
+static struct hw_pci xgene_pcie_hw __initdata = {
+ .nr_controllers = XGENE_PCIE_MAX_PORTS,
+ .setup = xgene_pcie_setup,
+ .scan = xgene_pcie_scan_bus,
+ .map_irq = of_irq_parse_and_map_pci,
+};
+
+static int __init xgene_pcie_probe_bridge(struct platform_device *pdev)
+{
+ struct device_node *np = of_node_get(pdev->dev.of_node);
+ struct xgene_pcie_port *port;
+ static int index;
+ u32 lanes = 0;
+ int ret;
+
+ port = devm_kzalloc(&pdev->dev, sizeof(*port), GFP_KERNEL);
+ if (port == NULL)
+ return -ENOMEM;
+ port->node = np;
+ port->dev = &pdev->dev;
+
+ ret = xgene_pcie_read_dts_config(port);
+ if (ret)
+ return ret;
+
+ ret = xgene_pcie_init_port(port);
+ if (ret)
+ goto skip;
+ xgene_pcie_program_core(port->csr_base);
+ xgene_pcie_setup_root_complex(port);
+ ret = xgene_pcie_parse_map_ranges(port);
+ if (ret)
+ goto skip;
+ ret = xgene_pcie_parse_map_dma_ranges(port);
+ if (ret)
+ goto skip;
+ xgene_pcie_poll_linkup(port, &lanes);
+skip:
+ if (!port->link_up)
+ dev_info(port->dev, "(rc) link down\n");
+ else
+ dev_info(port->dev, "(rc) x%d gen-%d link up\n",
+ lanes, port->link_speed + 1);
+#ifdef CONFIG_PCI_DOMAINS
+ xgene_pcie_hw.domain++;
+#endif
+ xgene_pcie_hw.private_data[index++] = port;
+ platform_set_drvdata(pdev, port);
+ return 0;
+}
+
+static const struct of_device_id xgene_pcie_match_table[] __initconst = {
+ {.compatible = "apm,xgene-pcie",},
+ {},
+};
+
+static struct platform_driver xgene_pcie_driver = {
+ .driver = {
+ .name = "xgene-pcie",
+ .owner = THIS_MODULE,
+ .of_match_table = of_match_ptr(xgene_pcie_match_table),
+ },
+};
+
+static int __init xgene_pcie_init(void)
+{
+ void *private;
+ int ret;
+
+ pr_info("X-Gene: PCIe driver\n");
+
+ /* allocate private data to keep xgene_pcie_port information */
+ private = kzalloc((XGENE_PCIE_MAX_PORTS * sizeof(void *)), GFP_KERNEL);
+ if (private == NULL)
+ return -ENOMEM;
+ xgene_pcie_hw.private_data = private;
+ ret = platform_driver_probe(&xgene_pcie_driver,
+ xgene_pcie_probe_bridge);
+ if (ret)
+ return ret;
+ pci_common_init(&xgene_pcie_hw);
+ return 0;
+}
+
+module_init(xgene_pcie_init);
+
+MODULE_AUTHOR("Tanmay Inamdar <tinamdar at apm.com>");
+MODULE_DESCRIPTION("APM X-Gene PCIe driver");
+MODULE_LICENSE("GPL v2");
--
1.7.9.5
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