PCI: Collect all native drivers under drivers/pci/controller/

Native PCI drivers for root complex devices were originally all in
drivers/pci/host/.  Some of these devices can also be operated in endpoint
mode.  Drivers for endpoint mode didn't seem to fit in the "host"
directory, so we put both the root complex and endpoint drivers in
per-device directories, e.g., drivers/pci/dwc/, drivers/pci/cadence/, etc.

These per-device directories contain trivial Kconfig and Makefiles and
clutter drivers/pci/.  Make a new drivers/pci/controllers/ directory and
collect all the device-specific drivers there.

No functional change intended.

Link: https://lkml.kernel.org/r/1520304202-232891-1-git-send-email-shawn.lin@rock-chips.com
Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
[bhelgaas: changelog]
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

1 files changed, 311 insertions, 0 deletions

diff --git a/drivers/pci/controller/pcie-cadence.h b/drivers/pci/controller/pcie-cadence.h
new file mode 100644
index 000000000000..4bb27333b05c
--- /dev/null
+++ b/drivers/pci/controller/pcie-cadence.h
@@ -0,0 +1,311 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (c) 2017 Cadence
+// Cadence PCIe controller driver.
+// Author: Cyrille Pitchen <cyrille.pitchen@free-electrons.com>
+
+#ifndef _PCIE_CADENCE_H
+#define _PCIE_CADENCE_H
+
+#include <linux/kernel.h>
+#include <linux/pci.h>
+
+/*
+ * Local Management Registers
+ */
+#define CDNS_PCIE_LM_BASE	0x00100000
+
+/* Vendor ID Register */
+#define CDNS_PCIE_LM_ID		(CDNS_PCIE_LM_BASE + 0x0044)
+#define  CDNS_PCIE_LM_ID_VENDOR_MASK	GENMASK(15, 0)
+#define  CDNS_PCIE_LM_ID_VENDOR_SHIFT	0
+#define  CDNS_PCIE_LM_ID_VENDOR(vid) \
+	(((vid) << CDNS_PCIE_LM_ID_VENDOR_SHIFT) & CDNS_PCIE_LM_ID_VENDOR_MASK)
+#define  CDNS_PCIE_LM_ID_SUBSYS_MASK	GENMASK(31, 16)
+#define  CDNS_PCIE_LM_ID_SUBSYS_SHIFT	16
+#define  CDNS_PCIE_LM_ID_SUBSYS(sub) \
+	(((sub) << CDNS_PCIE_LM_ID_SUBSYS_SHIFT) & CDNS_PCIE_LM_ID_SUBSYS_MASK)
+
+/* Root Port Requestor ID Register */
+#define CDNS_PCIE_LM_RP_RID	(CDNS_PCIE_LM_BASE + 0x0228)
+#define  CDNS_PCIE_LM_RP_RID_MASK	GENMASK(15, 0)
+#define  CDNS_PCIE_LM_RP_RID_SHIFT	0
+#define  CDNS_PCIE_LM_RP_RID_(rid) \
+	(((rid) << CDNS_PCIE_LM_RP_RID_SHIFT) & CDNS_PCIE_LM_RP_RID_MASK)
+
+/* Endpoint Bus and Device Number Register */
+#define CDNS_PCIE_LM_EP_ID	(CDNS_PCIE_LM_BASE + 0x022c)
+#define  CDNS_PCIE_LM_EP_ID_DEV_MASK	GENMASK(4, 0)
+#define  CDNS_PCIE_LM_EP_ID_DEV_SHIFT	0
+#define  CDNS_PCIE_LM_EP_ID_BUS_MASK	GENMASK(15, 8)
+#define  CDNS_PCIE_LM_EP_ID_BUS_SHIFT	8
+
+/* Endpoint Function f BAR b Configuration Registers */
+#define CDNS_PCIE_LM_EP_FUNC_BAR_CFG0(fn) \
+	(CDNS_PCIE_LM_BASE + 0x0240 + (fn) * 0x0008)
+#define CDNS_PCIE_LM_EP_FUNC_BAR_CFG1(fn) \
+	(CDNS_PCIE_LM_BASE + 0x0244 + (fn) * 0x0008)
+#define  CDNS_PCIE_LM_EP_FUNC_BAR_CFG_BAR_APERTURE_MASK(b) \
+	(GENMASK(4, 0) << ((b) * 8))
+#define  CDNS_PCIE_LM_EP_FUNC_BAR_CFG_BAR_APERTURE(b, a) \
+	(((a) << ((b) * 8)) & CDNS_PCIE_LM_EP_FUNC_BAR_CFG_BAR_APERTURE_MASK(b))
+#define  CDNS_PCIE_LM_EP_FUNC_BAR_CFG_BAR_CTRL_MASK(b) \
+	(GENMASK(7, 5) << ((b) * 8))
+#define  CDNS_PCIE_LM_EP_FUNC_BAR_CFG_BAR_CTRL(b, c) \
+	(((c) << ((b) * 8 + 5)) & CDNS_PCIE_LM_EP_FUNC_BAR_CFG_BAR_CTRL_MASK(b))
+
+/* Endpoint Function Configuration Register */
+#define CDNS_PCIE_LM_EP_FUNC_CFG	(CDNS_PCIE_LM_BASE + 0x02c0)
+
+/* Root Complex BAR Configuration Register */
+#define CDNS_PCIE_LM_RC_BAR_CFG	(CDNS_PCIE_LM_BASE + 0x0300)
+#define  CDNS_PCIE_LM_RC_BAR_CFG_BAR0_APERTURE_MASK	GENMASK(5, 0)
+#define  CDNS_PCIE_LM_RC_BAR_CFG_BAR0_APERTURE(a) \
+	(((a) << 0) & CDNS_PCIE_LM_RC_BAR_CFG_BAR0_APERTURE_MASK)
+#define  CDNS_PCIE_LM_RC_BAR_CFG_BAR0_CTRL_MASK		GENMASK(8, 6)
+#define  CDNS_PCIE_LM_RC_BAR_CFG_BAR0_CTRL(c) \
+	(((c) << 6) & CDNS_PCIE_LM_RC_BAR_CFG_BAR0_CTRL_MASK)
+#define  CDNS_PCIE_LM_RC_BAR_CFG_BAR1_APERTURE_MASK	GENMASK(13, 9)
+#define  CDNS_PCIE_LM_RC_BAR_CFG_BAR1_APERTURE(a) \
+	(((a) << 9) & CDNS_PCIE_LM_RC_BAR_CFG_BAR1_APERTURE_MASK)
+#define  CDNS_PCIE_LM_RC_BAR_CFG_BAR1_CTRL_MASK		GENMASK(16, 14)
+#define  CDNS_PCIE_LM_RC_BAR_CFG_BAR1_CTRL(c) \
+	(((c) << 14) & CDNS_PCIE_LM_RC_BAR_CFG_BAR1_CTRL_MASK)
+#define  CDNS_PCIE_LM_RC_BAR_CFG_PREFETCH_MEM_ENABLE	BIT(17)
+#define  CDNS_PCIE_LM_RC_BAR_CFG_PREFETCH_MEM_32BITS	0
+#define  CDNS_PCIE_LM_RC_BAR_CFG_PREFETCH_MEM_64BITS	BIT(18)
+#define  CDNS_PCIE_LM_RC_BAR_CFG_IO_ENABLE		BIT(19)
+#define  CDNS_PCIE_LM_RC_BAR_CFG_IO_16BITS		0
+#define  CDNS_PCIE_LM_RC_BAR_CFG_IO_32BITS		BIT(20)
+#define  CDNS_PCIE_LM_RC_BAR_CFG_CHECK_ENABLE		BIT(31)
+
+/* BAR control values applicable to both Endpoint Function and Root Complex */
+#define  CDNS_PCIE_LM_BAR_CFG_CTRL_DISABLED		0x0
+#define  CDNS_PCIE_LM_BAR_CFG_CTRL_IO_32BITS		0x1
+#define  CDNS_PCIE_LM_BAR_CFG_CTRL_MEM_32BITS		0x4
+#define  CDNS_PCIE_LM_BAR_CFG_CTRL_PREFETCH_MEM_32BITS	0x5
+#define  CDNS_PCIE_LM_BAR_CFG_CTRL_MEM_64BITS		0x6
+#define  CDNS_PCIE_LM_BAR_CFG_CTRL_PREFETCH_MEM_64BITS	0x7
+
+
+/*
+ * Endpoint Function Registers (PCI configuration space for endpoint functions)
+ */
+#define CDNS_PCIE_EP_FUNC_BASE(fn)	(((fn) << 12) & GENMASK(19, 12))
+
+#define CDNS_PCIE_EP_FUNC_MSI_CAP_OFFSET	0x90
+
+/*
+ * Root Port Registers (PCI configuration space for the root port function)
+ */
+#define CDNS_PCIE_RP_BASE	0x00200000
+
+
+/*
+ * Address Translation Registers
+ */
+#define CDNS_PCIE_AT_BASE	0x00400000
+
+/* Region r Outbound AXI to PCIe Address Translation Register 0 */
+#define CDNS_PCIE_AT_OB_REGION_PCI_ADDR0(r) \
+	(CDNS_PCIE_AT_BASE + 0x0000 + ((r) & 0x1f) * 0x0020)
+#define  CDNS_PCIE_AT_OB_REGION_PCI_ADDR0_NBITS_MASK	GENMASK(5, 0)
+#define  CDNS_PCIE_AT_OB_REGION_PCI_ADDR0_NBITS(nbits) \
+	(((nbits) - 1) & CDNS_PCIE_AT_OB_REGION_PCI_ADDR0_NBITS_MASK)
+#define  CDNS_PCIE_AT_OB_REGION_PCI_ADDR0_DEVFN_MASK	GENMASK(19, 12)
+#define  CDNS_PCIE_AT_OB_REGION_PCI_ADDR0_DEVFN(devfn) \
+	(((devfn) << 12) & CDNS_PCIE_AT_OB_REGION_PCI_ADDR0_DEVFN_MASK)
+#define  CDNS_PCIE_AT_OB_REGION_PCI_ADDR0_BUS_MASK	GENMASK(27, 20)
+#define  CDNS_PCIE_AT_OB_REGION_PCI_ADDR0_BUS(bus) \
+	(((bus) << 20) & CDNS_PCIE_AT_OB_REGION_PCI_ADDR0_BUS_MASK)
+
+/* Region r Outbound AXI to PCIe Address Translation Register 1 */
+#define CDNS_PCIE_AT_OB_REGION_PCI_ADDR1(r) \
+	(CDNS_PCIE_AT_BASE + 0x0004 + ((r) & 0x1f) * 0x0020)
+
+/* Region r Outbound PCIe Descriptor Register 0 */
+#define CDNS_PCIE_AT_OB_REGION_DESC0(r) \
+	(CDNS_PCIE_AT_BASE + 0x0008 + ((r) & 0x1f) * 0x0020)
+#define  CDNS_PCIE_AT_OB_REGION_DESC0_TYPE_MASK		GENMASK(3, 0)
+#define  CDNS_PCIE_AT_OB_REGION_DESC0_TYPE_MEM		0x2
+#define  CDNS_PCIE_AT_OB_REGION_DESC0_TYPE_IO		0x6
+#define  CDNS_PCIE_AT_OB_REGION_DESC0_TYPE_CONF_TYPE0	0xa
+#define  CDNS_PCIE_AT_OB_REGION_DESC0_TYPE_CONF_TYPE1	0xb
+#define  CDNS_PCIE_AT_OB_REGION_DESC0_TYPE_NORMAL_MSG	0xc
+#define  CDNS_PCIE_AT_OB_REGION_DESC0_TYPE_VENDOR_MSG	0xd
+/* Bit 23 MUST be set in RC mode. */
+#define  CDNS_PCIE_AT_OB_REGION_DESC0_HARDCODED_RID	BIT(23)
+#define  CDNS_PCIE_AT_OB_REGION_DESC0_DEVFN_MASK	GENMASK(31, 24)
+#define  CDNS_PCIE_AT_OB_REGION_DESC0_DEVFN(devfn) \
+	(((devfn) << 24) & CDNS_PCIE_AT_OB_REGION_DESC0_DEVFN_MASK)
+
+/* Region r Outbound PCIe Descriptor Register 1 */
+#define CDNS_PCIE_AT_OB_REGION_DESC1(r)	\
+	(CDNS_PCIE_AT_BASE + 0x000c + ((r) & 0x1f) * 0x0020)
+#define  CDNS_PCIE_AT_OB_REGION_DESC1_BUS_MASK	GENMASK(7, 0)
+#define  CDNS_PCIE_AT_OB_REGION_DESC1_BUS(bus) \
+	((bus) & CDNS_PCIE_AT_OB_REGION_DESC1_BUS_MASK)
+
+/* Region r AXI Region Base Address Register 0 */
+#define CDNS_PCIE_AT_OB_REGION_CPU_ADDR0(r) \
+	(CDNS_PCIE_AT_BASE + 0x0018 + ((r) & 0x1f) * 0x0020)
+#define  CDNS_PCIE_AT_OB_REGION_CPU_ADDR0_NBITS_MASK	GENMASK(5, 0)
+#define  CDNS_PCIE_AT_OB_REGION_CPU_ADDR0_NBITS(nbits) \
+	(((nbits) - 1) & CDNS_PCIE_AT_OB_REGION_CPU_ADDR0_NBITS_MASK)
+
+/* Region r AXI Region Base Address Register 1 */
+#define CDNS_PCIE_AT_OB_REGION_CPU_ADDR1(r) \
+	(CDNS_PCIE_AT_BASE + 0x001c + ((r) & 0x1f) * 0x0020)
+
+/* Root Port BAR Inbound PCIe to AXI Address Translation Register */
+#define CDNS_PCIE_AT_IB_RP_BAR_ADDR0(bar) \
+	(CDNS_PCIE_AT_BASE + 0x0800 + (bar) * 0x0008)
+#define  CDNS_PCIE_AT_IB_RP_BAR_ADDR0_NBITS_MASK	GENMASK(5, 0)
+#define  CDNS_PCIE_AT_IB_RP_BAR_ADDR0_NBITS(nbits) \
+	(((nbits) - 1) & CDNS_PCIE_AT_IB_RP_BAR_ADDR0_NBITS_MASK)
+#define CDNS_PCIE_AT_IB_RP_BAR_ADDR1(bar) \
+	(CDNS_PCIE_AT_BASE + 0x0804 + (bar) * 0x0008)
+
+enum cdns_pcie_rp_bar {
+	RP_BAR0,
+	RP_BAR1,
+	RP_NO_BAR
+};
+
+/* Endpoint Function BAR Inbound PCIe to AXI Address Translation Register */
+#define CDNS_PCIE_AT_IB_EP_FUNC_BAR_ADDR0(fn, bar) \
+	(CDNS_PCIE_AT_BASE + 0x0840 + (fn) * 0x0040 + (bar) * 0x0008)
+#define CDNS_PCIE_AT_IB_EP_FUNC_BAR_ADDR1(fn, bar) \
+	(CDNS_PCIE_AT_BASE + 0x0844 + (fn) * 0x0040 + (bar) * 0x0008)
+
+/* Normal/Vendor specific message access: offset inside some outbound region */
+#define CDNS_PCIE_NORMAL_MSG_ROUTING_MASK	GENMASK(7, 5)
+#define CDNS_PCIE_NORMAL_MSG_ROUTING(route) \
+	(((route) << 5) & CDNS_PCIE_NORMAL_MSG_ROUTING_MASK)
+#define CDNS_PCIE_NORMAL_MSG_CODE_MASK		GENMASK(15, 8)
+#define CDNS_PCIE_NORMAL_MSG_CODE(code) \
+	(((code) << 8) & CDNS_PCIE_NORMAL_MSG_CODE_MASK)
+#define CDNS_PCIE_MSG_NO_DATA			BIT(16)
+
+enum cdns_pcie_msg_code {
+	MSG_CODE_ASSERT_INTA	= 0x20,
+	MSG_CODE_ASSERT_INTB	= 0x21,
+	MSG_CODE_ASSERT_INTC	= 0x22,
+	MSG_CODE_ASSERT_INTD	= 0x23,
+	MSG_CODE_DEASSERT_INTA	= 0x24,
+	MSG_CODE_DEASSERT_INTB	= 0x25,
+	MSG_CODE_DEASSERT_INTC	= 0x26,
+	MSG_CODE_DEASSERT_INTD	= 0x27,
+};
+
+enum cdns_pcie_msg_routing {
+	/* Route to Root Complex */
+	MSG_ROUTING_TO_RC,
+
+	/* Use Address Routing */
+	MSG_ROUTING_BY_ADDR,
+
+	/* Use ID Routing */
+	MSG_ROUTING_BY_ID,
+
+	/* Route as Broadcast Message from Root Complex */
+	MSG_ROUTING_BCAST,
+
+	/* Local message; terminate at receiver (INTx messages) */
+	MSG_ROUTING_LOCAL,
+
+	/* Gather & route to Root Complex (PME_TO_Ack message) */
+	MSG_ROUTING_GATHER,
+};
+
+/**
+ * struct cdns_pcie - private data for Cadence PCIe controller drivers
+ * @reg_base: IO mapped register base
+ * @mem_res: start/end offsets in the physical system memory to map PCI accesses
+ * @is_rc: tell whether the PCIe controller mode is Root Complex or Endpoint.
+ * @bus: In Root Complex mode, the bus number
+ */
+struct cdns_pcie {
+	void __iomem		*reg_base;
+	struct resource		*mem_res;
+	bool			is_rc;
+	u8			bus;
+};
+
+/* Register access */
+static inline void cdns_pcie_writeb(struct cdns_pcie *pcie, u32 reg, u8 value)
+{
+	writeb(value, pcie->reg_base + reg);
+}
+
+static inline void cdns_pcie_writew(struct cdns_pcie *pcie, u32 reg, u16 value)
+{
+	writew(value, pcie->reg_base + reg);
+}
+
+static inline void cdns_pcie_writel(struct cdns_pcie *pcie, u32 reg, u32 value)
+{
+	writel(value, pcie->reg_base + reg);
+}
+
+static inline u32 cdns_pcie_readl(struct cdns_pcie *pcie, u32 reg)
+{
+	return readl(pcie->reg_base + reg);
+}
+
+/* Root Port register access */
+static inline void cdns_pcie_rp_writeb(struct cdns_pcie *pcie,
+				       u32 reg, u8 value)
+{
+	writeb(value, pcie->reg_base + CDNS_PCIE_RP_BASE + reg);
+}
+
+static inline void cdns_pcie_rp_writew(struct cdns_pcie *pcie,
+				       u32 reg, u16 value)
+{
+	writew(value, pcie->reg_base + CDNS_PCIE_RP_BASE + reg);
+}
+
+/* Endpoint Function register access */
+static inline void cdns_pcie_ep_fn_writeb(struct cdns_pcie *pcie, u8 fn,
+					  u32 reg, u8 value)
+{
+	writeb(value, pcie->reg_base + CDNS_PCIE_EP_FUNC_BASE(fn) + reg);
+}
+
+static inline void cdns_pcie_ep_fn_writew(struct cdns_pcie *pcie, u8 fn,
+					  u32 reg, u16 value)
+{
+	writew(value, pcie->reg_base + CDNS_PCIE_EP_FUNC_BASE(fn) + reg);
+}
+
+static inline void cdns_pcie_ep_fn_writel(struct cdns_pcie *pcie, u8 fn,
+					  u32 reg, u16 value)
+{
+	writel(value, pcie->reg_base + CDNS_PCIE_EP_FUNC_BASE(fn) + reg);
+}
+
+static inline u8 cdns_pcie_ep_fn_readb(struct cdns_pcie *pcie, u8 fn, u32 reg)
+{
+	return readb(pcie->reg_base + CDNS_PCIE_EP_FUNC_BASE(fn) + reg);
+}
+
+static inline u16 cdns_pcie_ep_fn_readw(struct cdns_pcie *pcie, u8 fn, u32 reg)
+{
+	return readw(pcie->reg_base + CDNS_PCIE_EP_FUNC_BASE(fn) + reg);
+}
+
+static inline u32 cdns_pcie_ep_fn_readl(struct cdns_pcie *pcie, u8 fn, u32 reg)
+{
+	return readl(pcie->reg_base + CDNS_PCIE_EP_FUNC_BASE(fn) + reg);
+}
+
+void cdns_pcie_set_outbound_region(struct cdns_pcie *pcie, u8 fn,
+				   u32 r, bool is_io,
+				   u64 cpu_addr, u64 pci_addr, size_t size);
+
+void cdns_pcie_set_outbound_region_for_normal_msg(struct cdns_pcie *pcie, u8 fn,
+						  u32 r, u64 cpu_addr);
+
+void cdns_pcie_reset_outbound_region(struct cdns_pcie *pcie, u32 r);
+
+#endif /* _PCIE_CADENCE_H */