[PATCH 2/3] pci/designware: Add base driver for Designware PCIe
Minghuan Lian
Minghuan.Lian at freescale.com
Tue Mar 24 23:42:40 PDT 2015
The Synopsys Designware IP is shared with couples of platforms
under multiple architectures. The patch is to provide basic
architecture-independent Designware PCIe host driver including
ATU initialization and PCI OPS. Currently, which supports arm
and arm64 simultaneously.
Signed-off-by: Minghuan Lian <Minghuan.Lian at freescale.com>
---
drivers/pci/host/Kconfig | 3 +
drivers/pci/host/Makefile | 1 +
drivers/pci/host/pcie-designware-base.c | 282 ++++++++++++++++++++++++++++++++
drivers/pci/host/pcie-designware-base.h | 62 +++++++
4 files changed, 348 insertions(+)
create mode 100644 drivers/pci/host/pcie-designware-base.c
create mode 100644 drivers/pci/host/pcie-designware-base.h
diff --git a/drivers/pci/host/Kconfig b/drivers/pci/host/Kconfig
index 7b892a9..f883d47 100644
--- a/drivers/pci/host/Kconfig
+++ b/drivers/pci/host/Kconfig
@@ -18,6 +18,9 @@ config PCI_MVEBU
config PCIE_DW
bool
+config PCIE_DW_BASE
+ bool
+
config PCI_EXYNOS
bool "Samsung Exynos PCIe controller"
depends on SOC_EXYNOS5440
diff --git a/drivers/pci/host/Makefile b/drivers/pci/host/Makefile
index e61d91c..47e7fee 100644
--- a/drivers/pci/host/Makefile
+++ b/drivers/pci/host/Makefile
@@ -1,3 +1,4 @@
+obj-$(CONFIG_PCIE_DW_BASE) += pcie-designware-base.o
obj-$(CONFIG_PCIE_DW) += pcie-designware.o
obj-$(CONFIG_PCI_DRA7XX) += pci-dra7xx.o
obj-$(CONFIG_PCI_EXYNOS) += pci-exynos.o
diff --git a/drivers/pci/host/pcie-designware-base.c b/drivers/pci/host/pcie-designware-base.c
new file mode 100644
index 0000000..f661151
--- /dev/null
+++ b/drivers/pci/host/pcie-designware-base.c
@@ -0,0 +1,282 @@
+/*
+ * Synopsys Designware PCIe host controller base driver
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of_pci.h>
+#include <linux/pci.h>
+#include <linux/pci_regs.h>
+#include <linux/platform_device.h>
+
+#include "pcie-designware-base.h"
+
+void dw_pcie_dbi_write(struct dw_pcie_port *pp, u32 value, u32 offset)
+{
+ iowrite32(value, pp->dbi + offset);
+}
+
+u32 dw_pcie_dbi_read(struct dw_pcie_port *pp, u32 offset)
+{
+ return ioread32(pp->dbi + offset);
+}
+
+int dw_pcie_host_link_up(struct dw_pcie_port *pp)
+{
+ if (pp->dw_ops->link_up)
+ return pp->dw_ops->link_up(pp);
+ else
+ return 0;
+}
+
+void dw_pcie_atu_outbound_set(struct dw_pcie_port *pp, int idx, int type,
+ u64 cpu_addr, u64 pci_addr, u32 size)
+{
+ if (idx >= pp->atu_num)
+ return;
+
+ dw_pcie_dbi_write(pp, PCIE_ATU_REGION_OUTBOUND | idx,
+ PCIE_ATU_VIEWPORT);
+ dw_pcie_dbi_write(pp, lower_32_bits(cpu_addr),
+ PCIE_ATU_LOWER_BASE);
+ dw_pcie_dbi_write(pp, upper_32_bits(cpu_addr),
+ PCIE_ATU_UPPER_BASE);
+ dw_pcie_dbi_write(pp, lower_32_bits(cpu_addr + size - 1),
+ PCIE_ATU_LIMIT);
+ dw_pcie_dbi_write(pp, lower_32_bits(pci_addr),
+ PCIE_ATU_LOWER_TARGET);
+ dw_pcie_dbi_write(pp, upper_32_bits(pci_addr),
+ PCIE_ATU_UPPER_TARGET);
+ dw_pcie_dbi_write(pp, type, PCIE_ATU_CR1);
+ dw_pcie_dbi_write(pp, PCIE_ATU_ENABLE, PCIE_ATU_CR2);
+}
+
+static void __iomem *
+dw_pcie_map_bus(struct pci_bus *bus, unsigned int devfn, int offset)
+{
+ struct dw_pcie_port *pp = bus->sysdata;
+ u32 type, busdev;
+
+ /* If there is no link, then there is no device */
+ if (!pci_is_root_bus(bus) && !dw_pcie_host_link_up(pp))
+ return NULL;
+
+ /* access only one slot on each root port */
+ if (pci_is_root_bus(bus) && devfn > 0)
+ return NULL;
+
+ if (pci_is_root_bus(bus))
+ return pp->dbi + offset;
+
+ busdev = PCIE_ATU_BUS(bus->number) |
+ PCIE_ATU_DEV(PCI_SLOT(devfn)) |
+ PCIE_ATU_FUNC(PCI_FUNC(devfn));
+
+ if (pci_is_root_bus(bus->parent))
+ type = PCIE_ATU_TYPE_CFG0;
+ else
+ type = PCIE_ATU_TYPE_CFG1;
+
+ dw_pcie_atu_outbound_set(pp,
+ PCIE_ATU_REGION_INDEX0,
+ type,
+ pp->cfg_addr,
+ busdev,
+ pp->cfg_size);
+
+ return pp->cfg + offset;
+}
+
+static int dw_pcie_config_read(struct pci_bus *bus, unsigned int devfn,
+ int where, int size, u32 *val)
+{
+ struct dw_pcie_port *pp = bus->sysdata;
+ int ret;
+
+ ret = pci_generic_config_read32(bus, devfn, where, size, val);
+
+ if (pp->atu_num == 2 && !pci_is_root_bus(bus))
+ /* reassign ATU0 to map IO space */
+ dw_pcie_atu_outbound_set(pp,
+ PCIE_ATU_REGION_INDEX0,
+ PCIE_ATU_TYPE_IO,
+ pp->io_cpu_addr,
+ pp->io_pci_addr,
+ pp->io_size);
+
+ return ret;
+}
+
+static int dw_pcie_config_write(struct pci_bus *bus, unsigned int devfn,
+ int where, int size, u32 val)
+{
+ struct dw_pcie_port *pp = bus->sysdata;
+ int ret;
+
+ ret = pci_generic_config_write32(bus, devfn, where, size, val);
+
+ if (pp->atu_num == 2 && !pci_is_root_bus(bus))
+ /* reassign ATU0 to map IO space */
+ dw_pcie_atu_outbound_set(pp,
+ PCIE_ATU_REGION_INDEX0,
+ PCIE_ATU_TYPE_IO,
+ pp->io_cpu_addr,
+ pp->io_pci_addr,
+ pp->io_size);
+
+ return ret;
+}
+
+static struct pci_ops dw_pcie_ops = {
+ .map_bus = dw_pcie_map_bus,
+ .read = dw_pcie_config_read,
+ .write = dw_pcie_config_write,
+};
+
+static int dw_pcie_map_reg(struct dw_pcie_port *pp)
+{
+ struct platform_device *pdev = to_platform_device(pp->dev);
+ struct resource *res;
+
+ if (!pp->dbi) {
+ res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
+ "dbi");
+ if (!res) {
+ dev_err(pp->dev, "missing *dbi* reg space\n");
+ return -ENODEV;
+ }
+
+ pp->dbi = devm_ioremap_resource(pp->dev, res);
+ if (IS_ERR(pp->dbi))
+ return PTR_ERR(pp->dbi);
+ }
+
+ if (!pp->cfg) {
+ res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
+ "config");
+ if (!res) {
+ dev_err(pp->dev, "missing *config* reg space\n");
+ return -ENODEV;
+ }
+
+ pp->cfg = devm_ioremap_resource(pp->dev, res);
+ if (IS_ERR(pp->cfg))
+ return PTR_ERR(pp->cfg);
+
+ pp->cfg_addr = res->start;
+ pp->cfg_size = resource_size(res);
+ }
+
+ return 0;
+}
+
+/*
+ * If ATU number = 2, ATU0 is shared by transaction CFG and IO,
+ * ATU1 is used for transaction MEM
+ * If ATU number > 2, ATU0 is used for transaction CFG
+ * the other ATUs are used for MEM and IO separately.
+ */
+static int dw_pcie_atu_init(struct dw_pcie_port *pp,
+ struct list_head *res,
+ resource_size_t io_base)
+{
+ struct resource_entry *window;
+ struct device *dev = pp->dev;
+ int idx = 1, ret;
+
+ if (pp->atu_num < 2)
+ pp->atu_num = 2;
+
+ resource_list_for_each_entry(window, res) {
+ struct resource *res = window->res;
+ unsigned long restype = resource_type(res);
+
+ switch (restype) {
+ case IORESOURCE_IO:
+ if (pp->atu_num == 2)
+ idx = 0;
+
+ pp->io_cpu_addr = io_base;
+ pp->io_pci_addr = res->start - window->offset;
+ pp->io_size = resource_size(res);
+ dw_pcie_atu_outbound_set(pp,
+ idx,
+ PCIE_ATU_TYPE_IO,
+ pp->io_cpu_addr,
+ pp->io_pci_addr,
+ pp->io_size);
+ ret = pci_remap_iospace(res, io_base);
+ if (ret < 0)
+ return ret;
+ idx++;
+ break;
+ case IORESOURCE_MEM:
+ if (pp->atu_num == 2)
+ idx = 1;
+
+ dw_pcie_atu_outbound_set(pp,
+ idx,
+ PCIE_ATU_TYPE_MEM,
+ res->start,
+ res->start - window->offset,
+ resource_size(res));
+ idx++;
+ break;
+ case IORESOURCE_BUS:
+ break;
+ default:
+ dev_err(dev, "invalid resource %pR\n", res);
+ return -EINVAL;
+ }
+ }
+
+ return 0;
+}
+
+int dw_pcie_port_init(struct dw_pcie_port *pp)
+{
+ struct device_node *dn = pp->dev->of_node;
+ resource_size_t iobase = 0;
+ struct pci_bus *bus;
+ int ret;
+ LIST_HEAD(res);
+
+ ret = dw_pcie_map_reg(pp);
+ if (ret)
+ return ret;
+
+ ret = of_pci_get_host_bridge_resources(dn, 0, 0xff, &res, &iobase);
+ if (ret)
+ return ret;
+
+ ret = dw_pcie_atu_init(pp, &res, iobase);
+ if (ret)
+ return ret;
+
+ if (!pp->pci_ops)
+ pp->pci_ops = &dw_pcie_ops;
+
+ if (pp->dw_ops->host_init) {
+ if (pp->dw_ops->host_init(pp))
+ return ret;
+ }
+
+ bus = pci_create_root_bus(pp->dev, 0, pp->pci_ops,
+ pp, &res);
+ if (!bus)
+ return -ENOMEM;
+
+ pci_scan_child_bus(bus);
+ pci_assign_unassigned_bus_resources(bus);
+ pci_bus_add_devices(bus);
+
+ return 0;
+}
+
+MODULE_AUTHOR("Minghuan Lian <Minghuan.Lian at freescale.com>");
+MODULE_DESCRIPTION("Designware PCIe controller driver with Multiarch support");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/pci/host/pcie-designware-base.h b/drivers/pci/host/pcie-designware-base.h
new file mode 100644
index 0000000..dd7a3b3
--- /dev/null
+++ b/drivers/pci/host/pcie-designware-base.h
@@ -0,0 +1,62 @@
+/*
+ * Synopsys Designware PCIe host controller base driver
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef _PCIE_DESIGNWARE_BASE_H
+#define _PCIE_DESIGNWARE_BASE_H
+
+/* Synopsis specific PCIE configuration registers */
+#define PCIE_ATU_VIEWPORT 0x900
+#define PCIE_ATU_REGION_INBOUND (0x1 << 31)
+#define PCIE_ATU_REGION_OUTBOUND (0x0 << 31)
+#define PCIE_ATU_REGION_INDEX0 (0x0 << 0)
+#define PCIE_ATU_CR1 0x904
+#define PCIE_ATU_TYPE_MEM (0x0 << 0)
+#define PCIE_ATU_TYPE_IO (0x2 << 0)
+#define PCIE_ATU_TYPE_CFG0 (0x4 << 0)
+#define PCIE_ATU_TYPE_CFG1 (0x5 << 0)
+#define PCIE_ATU_CR2 0x908
+#define PCIE_ATU_ENABLE (0x1 << 31)
+#define PCIE_ATU_BAR_MODE_ENABLE (0x1 << 30)
+#define PCIE_ATU_LOWER_BASE 0x90C
+#define PCIE_ATU_UPPER_BASE 0x910
+#define PCIE_ATU_LIMIT 0x914
+#define PCIE_ATU_LOWER_TARGET 0x918
+#define PCIE_ATU_BUS(x) (((x) & 0xff) << 24)
+#define PCIE_ATU_DEV(x) (((x) & 0x1f) << 19)
+#define PCIE_ATU_FUNC(x) (((x) & 0x7) << 16)
+#define PCIE_ATU_UPPER_TARGET 0x91C
+
+struct dw_pcie_port;
+
+struct dw_host_ops {
+ int (*link_up)(struct dw_pcie_port *pp);
+ int (*host_init)(struct dw_pcie_port *pp);
+};
+
+struct dw_pcie_port {
+ struct device *dev;
+ void __iomem *dbi;
+ void __iomem *cfg;
+ u64 cfg_addr;
+ u32 cfg_size;
+ u64 io_cpu_addr;
+ u64 io_pci_addr;
+ u32 io_size;
+ u32 atu_num;
+ struct dw_host_ops *dw_ops;
+ struct pci_ops *pci_ops;
+};
+
+void dw_pcie_dbi_write(struct dw_pcie_port *pp, u32 value, u32 offset);
+u32 dw_pcie_dbi_read(struct dw_pcie_port *pp, u32 offset);
+int dw_pcie_host_link_up(struct dw_pcie_port *pp);
+void dw_pcie_atu_outbound_set(struct dw_pcie_port *pp, int idx, int type,
+ u64 cpu_addr, u64 pci_addr, u32 size);
+int dw_pcie_port_init(struct dw_pcie_port *pp);
+
+#endif /* _PCIE_DESIGNWARE_BASE_H */
--
1.9.1
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