From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sun, 7 Apr 2024 20:49:45 +0200
Subject: Adding upstream version 6.1.76.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 arch/arm/mach-mv78xx0/pcie.c | 280 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 280 insertions(+)
 create mode 100644 arch/arm/mach-mv78xx0/pcie.c

(limited to 'arch/arm/mach-mv78xx0/pcie.c')

diff --git a/arch/arm/mach-mv78xx0/pcie.c b/arch/arm/mach-mv78xx0/pcie.c
new file mode 100644
index 000000000..6190f538a
--- /dev/null
+++ b/arch/arm/mach-mv78xx0/pcie.c
@@ -0,0 +1,280 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * arch/arm/mach-mv78xx0/pcie.c
+ *
+ * PCIe functions for Marvell MV78xx0 SoCs
+ */
+
+#include <linux/kernel.h>
+#include <linux/pci.h>
+#include <linux/mbus.h>
+#include <video/vga.h>
+#include <asm/irq.h>
+#include <asm/mach/pci.h>
+#include <plat/pcie.h>
+#include "mv78xx0.h"
+#include "common.h"
+
+#define MV78XX0_MBUS_PCIE_MEM_TARGET(port, lane) ((port) ? 8 : 4)
+#define MV78XX0_MBUS_PCIE_MEM_ATTR(port, lane)   (0xf8 & ~(0x10 << (lane)))
+#define MV78XX0_MBUS_PCIE_IO_TARGET(port, lane)  ((port) ? 8 : 4)
+#define MV78XX0_MBUS_PCIE_IO_ATTR(port, lane)    (0xf0 & ~(0x10 << (lane)))
+
+struct pcie_port {
+	u8			maj;
+	u8			min;
+	u8			root_bus_nr;
+	void __iomem		*base;
+	spinlock_t		conf_lock;
+	char			mem_space_name[20];
+	struct resource		res;
+};
+
+static struct pcie_port pcie_port[8];
+static int num_pcie_ports;
+static struct resource pcie_io_space;
+
+void __init mv78xx0_pcie_id(u32 *dev, u32 *rev)
+{
+	*dev = orion_pcie_dev_id(PCIE00_VIRT_BASE);
+	*rev = orion_pcie_rev(PCIE00_VIRT_BASE);
+}
+
+u32 pcie_port_size[8] = {
+	0,
+	0x30000000,
+	0x10000000,
+	0x10000000,
+	0x08000000,
+	0x08000000,
+	0x08000000,
+	0x04000000,
+};
+
+static void __init mv78xx0_pcie_preinit(void)
+{
+	int i;
+	u32 size_each;
+	u32 start;
+
+	pcie_io_space.name = "PCIe I/O Space";
+	pcie_io_space.start = MV78XX0_PCIE_IO_PHYS_BASE(0);
+	pcie_io_space.end =
+		MV78XX0_PCIE_IO_PHYS_BASE(0) + MV78XX0_PCIE_IO_SIZE * 8 - 1;
+	pcie_io_space.flags = IORESOURCE_MEM;
+	if (request_resource(&iomem_resource, &pcie_io_space))
+		panic("can't allocate PCIe I/O space");
+
+	if (num_pcie_ports > 7)
+		panic("invalid number of PCIe ports");
+
+	size_each = pcie_port_size[num_pcie_ports];
+
+	start = MV78XX0_PCIE_MEM_PHYS_BASE;
+	for (i = 0; i < num_pcie_ports; i++) {
+		struct pcie_port *pp = pcie_port + i;
+
+		snprintf(pp->mem_space_name, sizeof(pp->mem_space_name),
+			"PCIe %d.%d MEM", pp->maj, pp->min);
+		pp->mem_space_name[sizeof(pp->mem_space_name) - 1] = 0;
+		pp->res.name = pp->mem_space_name;
+		pp->res.flags = IORESOURCE_MEM;
+		pp->res.start = start;
+		pp->res.end = start + size_each - 1;
+		start += size_each;
+
+		if (request_resource(&iomem_resource, &pp->res))
+			panic("can't allocate PCIe MEM sub-space");
+
+		mvebu_mbus_add_window_by_id(MV78XX0_MBUS_PCIE_MEM_TARGET(pp->maj, pp->min),
+					    MV78XX0_MBUS_PCIE_MEM_ATTR(pp->maj, pp->min),
+					    pp->res.start, resource_size(&pp->res));
+		mvebu_mbus_add_window_remap_by_id(MV78XX0_MBUS_PCIE_IO_TARGET(pp->maj, pp->min),
+						  MV78XX0_MBUS_PCIE_IO_ATTR(pp->maj, pp->min),
+						  i * SZ_64K, SZ_64K, 0);
+	}
+}
+
+static int __init mv78xx0_pcie_setup(int nr, struct pci_sys_data *sys)
+{
+	struct pcie_port *pp;
+	struct resource realio;
+
+	if (nr >= num_pcie_ports)
+		return 0;
+
+	pp = &pcie_port[nr];
+	sys->private_data = pp;
+	pp->root_bus_nr = sys->busnr;
+
+	/*
+	 * Generic PCIe unit setup.
+	 */
+	orion_pcie_set_local_bus_nr(pp->base, sys->busnr);
+	orion_pcie_setup(pp->base);
+
+	realio.start = nr * SZ_64K;
+	realio.end = realio.start + SZ_64K - 1;
+	pci_remap_iospace(&realio, MV78XX0_PCIE_IO_PHYS_BASE(nr));
+
+	pci_add_resource_offset(&sys->resources, &pp->res, sys->mem_offset);
+
+	return 1;
+}
+
+static int pcie_valid_config(struct pcie_port *pp, int bus, int dev)
+{
+	/*
+	 * Don't go out when trying to access nonexisting devices
+	 * on the local bus.
+	 */
+	if (bus == pp->root_bus_nr && dev > 1)
+		return 0;
+
+	return 1;
+}
+
+static int pcie_rd_conf(struct pci_bus *bus, u32 devfn, int where,
+			int size, u32 *val)
+{
+	struct pci_sys_data *sys = bus->sysdata;
+	struct pcie_port *pp = sys->private_data;
+	unsigned long flags;
+	int ret;
+
+	if (pcie_valid_config(pp, bus->number, PCI_SLOT(devfn)) == 0) {
+		*val = 0xffffffff;
+		return PCIBIOS_DEVICE_NOT_FOUND;
+	}
+
+	spin_lock_irqsave(&pp->conf_lock, flags);
+	ret = orion_pcie_rd_conf(pp->base, bus, devfn, where, size, val);
+	spin_unlock_irqrestore(&pp->conf_lock, flags);
+
+	return ret;
+}
+
+static int pcie_wr_conf(struct pci_bus *bus, u32 devfn,
+			int where, int size, u32 val)
+{
+	struct pci_sys_data *sys = bus->sysdata;
+	struct pcie_port *pp = sys->private_data;
+	unsigned long flags;
+	int ret;
+
+	if (pcie_valid_config(pp, bus->number, PCI_SLOT(devfn)) == 0)
+		return PCIBIOS_DEVICE_NOT_FOUND;
+
+	spin_lock_irqsave(&pp->conf_lock, flags);
+	ret = orion_pcie_wr_conf(pp->base, bus, devfn, where, size, val);
+	spin_unlock_irqrestore(&pp->conf_lock, flags);
+
+	return ret;
+}
+
+static struct pci_ops pcie_ops = {
+	.read = pcie_rd_conf,
+	.write = pcie_wr_conf,
+};
+
+/*
+ * The root complex has a hardwired class of PCI_CLASS_MEMORY_OTHER, when it
+ * is operating as a root complex this needs to be switched to
+ * PCI_CLASS_BRIDGE_HOST or Linux will errantly try to process the BAR's on
+ * the device. Decoding setup is handled by the orion code.
+ */
+static void rc_pci_fixup(struct pci_dev *dev)
+{
+	if (dev->bus->parent == NULL && dev->devfn == 0) {
+		int i;
+
+		dev->class &= 0xff;
+		dev->class |= PCI_CLASS_BRIDGE_HOST << 8;
+		for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
+			dev->resource[i].start = 0;
+			dev->resource[i].end   = 0;
+			dev->resource[i].flags = 0;
+		}
+	}
+}
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_MARVELL, PCI_ANY_ID, rc_pci_fixup);
+
+static int __init mv78xx0_pcie_scan_bus(int nr, struct pci_host_bridge *bridge)
+{
+	struct pci_sys_data *sys = pci_host_bridge_priv(bridge);
+
+	if (nr >= num_pcie_ports) {
+		BUG();
+		return -EINVAL;
+	}
+
+	list_splice_init(&sys->resources, &bridge->windows);
+	bridge->dev.parent = NULL;
+	bridge->sysdata = sys;
+	bridge->busnr = sys->busnr;
+	bridge->ops = &pcie_ops;
+
+	return pci_scan_root_bus_bridge(bridge);
+}
+
+static int __init mv78xx0_pcie_map_irq(const struct pci_dev *dev, u8 slot,
+	u8 pin)
+{
+	struct pci_sys_data *sys = dev->bus->sysdata;
+	struct pcie_port *pp = sys->private_data;
+
+	return IRQ_MV78XX0_PCIE_00 + (pp->maj << 2) + pp->min;
+}
+
+static struct hw_pci mv78xx0_pci __initdata = {
+	.nr_controllers	= 8,
+	.preinit	= mv78xx0_pcie_preinit,
+	.setup		= mv78xx0_pcie_setup,
+	.scan		= mv78xx0_pcie_scan_bus,
+	.map_irq	= mv78xx0_pcie_map_irq,
+};
+
+static void __init add_pcie_port(int maj, int min, void __iomem *base)
+{
+	printk(KERN_INFO "MV78xx0 PCIe port %d.%d: ", maj, min);
+
+	if (orion_pcie_link_up(base)) {
+		struct pcie_port *pp = &pcie_port[num_pcie_ports++];
+
+		printk("link up\n");
+
+		pp->maj = maj;
+		pp->min = min;
+		pp->root_bus_nr = -1;
+		pp->base = base;
+		spin_lock_init(&pp->conf_lock);
+		memset(&pp->res, 0, sizeof(pp->res));
+	} else {
+		printk("link down, ignoring\n");
+	}
+}
+
+void __init mv78xx0_pcie_init(int init_port0, int init_port1)
+{
+	vga_base = MV78XX0_PCIE_MEM_PHYS_BASE;
+
+	if (init_port0) {
+		add_pcie_port(0, 0, PCIE00_VIRT_BASE);
+		if (!orion_pcie_x4_mode(PCIE00_VIRT_BASE)) {
+			add_pcie_port(0, 1, PCIE01_VIRT_BASE);
+			add_pcie_port(0, 2, PCIE02_VIRT_BASE);
+			add_pcie_port(0, 3, PCIE03_VIRT_BASE);
+		}
+	}
+
+	if (init_port1) {
+		add_pcie_port(1, 0, PCIE10_VIRT_BASE);
+		if (!orion_pcie_x4_mode((void __iomem *)PCIE10_VIRT_BASE)) {
+			add_pcie_port(1, 1, PCIE11_VIRT_BASE);
+			add_pcie_port(1, 2, PCIE12_VIRT_BASE);
+			add_pcie_port(1, 3, PCIE13_VIRT_BASE);
+		}
+	}
+
+	pci_common_init(&mv78xx0_pci);
+}
-- 
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