From 8e4bff4cab0ddac6060645b0715210484d02ff40 Mon Sep 17 00:00:00 2001
From: Yuval Adam <_@yuv.al>
Date: Wed, 30 Aug 2017 08:25:59 +0000
Subject: Initial file dump from open source release

---
 arch/arm/mach-orion5x/pci.c | 588 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 588 insertions(+)
 create mode 100644 arch/arm/mach-orion5x/pci.c

(limited to 'arch/arm/mach-orion5x/pci.c')

diff --git a/arch/arm/mach-orion5x/pci.c b/arch/arm/mach-orion5x/pci.c
new file mode 100644
index 00000000..50336802
--- /dev/null
+++ b/arch/arm/mach-orion5x/pci.c
@@ -0,0 +1,588 @@
+/*
+ * arch/arm/mach-orion5x/pci.c
+ *
+ * PCI and PCIe functions for Marvell Orion System On Chip
+ *
+ * Maintainer: Tzachi Perelstein <tzachi@marvell.com>
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2.  This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#include <linux/kernel.h>
+#include <linux/pci.h>
+#include <linux/slab.h>
+#include <linux/mbus.h>
+#include <video/vga.h>
+#include <asm/irq.h>
+#include <asm/mach/pci.h>
+#include <plat/pcie.h>
+#include <plat/addr-map.h>
+#include <mach/orion5x.h>
+#include "common.h"
+
+/*****************************************************************************
+ * Orion has one PCIe controller and one PCI controller.
+ *
+ * Note1: The local PCIe bus number is '0'. The local PCI bus number
+ * follows the scanned PCIe bridged busses, if any.
+ *
+ * Note2: It is possible for PCI/PCIe agents to access many subsystem's
+ * space, by configuring BARs and Address Decode Windows, e.g. flashes on
+ * device bus, Orion registers, etc. However this code only enable the
+ * access to DDR banks.
+ ****************************************************************************/
+
+
+/*****************************************************************************
+ * PCIe controller
+ ****************************************************************************/
+#define PCIE_BASE	(ORION5X_PCIE_VIRT_BASE)
+
+void __init orion5x_pcie_id(u32 *dev, u32 *rev)
+{
+	*dev = orion_pcie_dev_id(PCIE_BASE);
+	*rev = orion_pcie_rev(PCIE_BASE);
+}
+
+static int pcie_valid_config(int bus, int dev)
+{
+	/*
+	 * Don't go out when trying to access --
+	 * 1. nonexisting device on local bus
+	 * 2. where there's no device connected (no link)
+	 */
+	if (bus == 0 && dev == 0)
+		return 1;
+
+	if (!orion_pcie_link_up(PCIE_BASE))
+		return 0;
+
+	if (bus == 0 && dev != 1)
+		return 0;
+
+	return 1;
+}
+
+
+/*
+ * PCIe config cycles are done by programming the PCIE_CONF_ADDR register
+ * and then reading the PCIE_CONF_DATA register. Need to make sure these
+ * transactions are atomic.
+ */
+static DEFINE_SPINLOCK(orion5x_pcie_lock);
+
+static int pcie_rd_conf(struct pci_bus *bus, u32 devfn, int where,
+			int size, u32 *val)
+{
+	unsigned long flags;
+	int ret;
+
+	if (pcie_valid_config(bus->number, PCI_SLOT(devfn)) == 0) {
+		*val = 0xffffffff;
+		return PCIBIOS_DEVICE_NOT_FOUND;
+	}
+
+	spin_lock_irqsave(&orion5x_pcie_lock, flags);
+	ret = orion_pcie_rd_conf(PCIE_BASE, bus, devfn, where, size, val);
+	spin_unlock_irqrestore(&orion5x_pcie_lock, flags);
+
+	return ret;
+}
+
+static int pcie_rd_conf_wa(struct pci_bus *bus, u32 devfn,
+			   int where, int size, u32 *val)
+{
+	int ret;
+
+	if (pcie_valid_config(bus->number, PCI_SLOT(devfn)) == 0) {
+		*val = 0xffffffff;
+		return PCIBIOS_DEVICE_NOT_FOUND;
+	}
+
+	/*
+	 * We only support access to the non-extended configuration
+	 * space when using the WA access method (or we would have to
+	 * sacrifice 256M of CPU virtual address space.)
+	 */
+	if (where >= 0x100) {
+		*val = 0xffffffff;
+		return PCIBIOS_DEVICE_NOT_FOUND;
+	}
+
+	ret = orion_pcie_rd_conf_wa(ORION5X_PCIE_WA_VIRT_BASE,
+				    bus, devfn, where, size, val);
+
+	return ret;
+}
+
+static int pcie_wr_conf(struct pci_bus *bus, u32 devfn,
+			int where, int size, u32 val)
+{
+	unsigned long flags;
+	int ret;
+
+	if (pcie_valid_config(bus->number, PCI_SLOT(devfn)) == 0)
+		return PCIBIOS_DEVICE_NOT_FOUND;
+
+	spin_lock_irqsave(&orion5x_pcie_lock, flags);
+	ret = orion_pcie_wr_conf(PCIE_BASE, bus, devfn, where, size, val);
+	spin_unlock_irqrestore(&orion5x_pcie_lock, flags);
+
+	return ret;
+}
+
+static struct pci_ops pcie_ops = {
+	.read = pcie_rd_conf,
+	.write = pcie_wr_conf,
+};
+
+
+static int __init pcie_setup(struct pci_sys_data *sys)
+{
+	struct resource *res;
+	int dev;
+
+	/*
+	 * Generic PCIe unit setup.
+	 */
+	orion_pcie_setup(PCIE_BASE);
+
+	/*
+	 * Check whether to apply Orion-1/Orion-NAS PCIe config
+	 * read transaction workaround.
+	 */
+	dev = orion_pcie_dev_id(PCIE_BASE);
+	if (dev == MV88F5181_DEV_ID || dev == MV88F5182_DEV_ID) {
+		printk(KERN_NOTICE "Applying Orion-1/Orion-NAS PCIe config "
+				   "read transaction workaround\n");
+		mvebu_mbus_add_window_remap_flags("pcie0.0",
+						  ORION5X_PCIE_WA_PHYS_BASE,
+						  ORION5X_PCIE_WA_SIZE,
+						  MVEBU_MBUS_NO_REMAP,
+						  MVEBU_MBUS_PCI_WA);
+		pcie_ops.read = pcie_rd_conf_wa;
+	}
+
+	pci_ioremap_io(sys->busnr * SZ_64K, ORION5X_PCIE_IO_PHYS_BASE);
+
+	/*
+	 * Request resources.
+	 */
+	res = kzalloc(sizeof(struct resource), GFP_KERNEL);
+	if (!res)
+		panic("pcie_setup unable to alloc resources");
+
+	/*
+	 * IORESOURCE_MEM
+	 */
+	res->name = "PCIe Memory Space";
+	res->flags = IORESOURCE_MEM;
+	res->start = ORION5X_PCIE_MEM_PHYS_BASE;
+	res->end = res->start + ORION5X_PCIE_MEM_SIZE - 1;
+	if (request_resource(&iomem_resource, res))
+		panic("Request PCIe Memory resource failed\n");
+	pci_add_resource_offset(&sys->resources, res, sys->mem_offset);
+
+	return 1;
+}
+
+/*****************************************************************************
+ * PCI controller
+ ****************************************************************************/
+#define ORION5X_PCI_REG(x)	(ORION5X_PCI_VIRT_BASE + (x))
+#define PCI_MODE		ORION5X_PCI_REG(0xd00)
+#define PCI_CMD			ORION5X_PCI_REG(0xc00)
+#define PCI_P2P_CONF		ORION5X_PCI_REG(0x1d14)
+#define PCI_CONF_ADDR		ORION5X_PCI_REG(0xc78)
+#define PCI_CONF_DATA		ORION5X_PCI_REG(0xc7c)
+
+/*
+ * PCI_MODE bits
+ */
+#define PCI_MODE_64BIT			(1 << 2)
+#define PCI_MODE_PCIX			((1 << 4) | (1 << 5))
+
+/*
+ * PCI_CMD bits
+ */
+#define PCI_CMD_HOST_REORDER		(1 << 29)
+
+/*
+ * PCI_P2P_CONF bits
+ */
+#define PCI_P2P_BUS_OFFS		16
+#define PCI_P2P_BUS_MASK		(0xff << PCI_P2P_BUS_OFFS)
+#define PCI_P2P_DEV_OFFS		24
+#define PCI_P2P_DEV_MASK		(0x1f << PCI_P2P_DEV_OFFS)
+
+/*
+ * PCI_CONF_ADDR bits
+ */
+#define PCI_CONF_REG(reg)		((reg) & 0xfc)
+#define PCI_CONF_FUNC(func)		(((func) & 0x3) << 8)
+#define PCI_CONF_DEV(dev)		(((dev) & 0x1f) << 11)
+#define PCI_CONF_BUS(bus)		(((bus) & 0xff) << 16)
+#define PCI_CONF_ADDR_EN		(1 << 31)
+
+/*
+ * Internal configuration space
+ */
+#define PCI_CONF_FUNC_STAT_CMD		0
+#define PCI_CONF_REG_STAT_CMD		4
+#define PCIX_STAT			0x64
+#define PCIX_STAT_BUS_OFFS		8
+#define PCIX_STAT_BUS_MASK		(0xff << PCIX_STAT_BUS_OFFS)
+
+/*
+ * PCI Address Decode Windows registers
+ */
+#define PCI_BAR_SIZE_DDR_CS(n)	(((n) == 0) ? ORION5X_PCI_REG(0xc08) : \
+				 ((n) == 1) ? ORION5X_PCI_REG(0xd08) : \
+				 ((n) == 2) ? ORION5X_PCI_REG(0xc0c) : \
+				 ((n) == 3) ? ORION5X_PCI_REG(0xd0c) : 0)
+#define PCI_BAR_REMAP_DDR_CS(n)	(((n) == 0) ? ORION5X_PCI_REG(0xc48) : \
+				 ((n) == 1) ? ORION5X_PCI_REG(0xd48) : \
+				 ((n) == 2) ? ORION5X_PCI_REG(0xc4c) : \
+				 ((n) == 3) ? ORION5X_PCI_REG(0xd4c) : 0)
+#define PCI_BAR_ENABLE		ORION5X_PCI_REG(0xc3c)
+#define PCI_ADDR_DECODE_CTRL	ORION5X_PCI_REG(0xd3c)
+
+/*
+ * PCI configuration helpers for BAR settings
+ */
+#define PCI_CONF_FUNC_BAR_CS(n)		((n) >> 1)
+#define PCI_CONF_REG_BAR_LO_CS(n)	(((n) & 1) ? 0x18 : 0x10)
+#define PCI_CONF_REG_BAR_HI_CS(n)	(((n) & 1) ? 0x1c : 0x14)
+
+/*
+ * PCI config cycles are done by programming the PCI_CONF_ADDR register
+ * and then reading the PCI_CONF_DATA register. Need to make sure these
+ * transactions are atomic.
+ */
+static DEFINE_SPINLOCK(orion5x_pci_lock);
+
+static int orion5x_pci_cardbus_mode;
+
+static int orion5x_pci_local_bus_nr(void)
+{
+	u32 conf = readl(PCI_P2P_CONF);
+	return((conf & PCI_P2P_BUS_MASK) >> PCI_P2P_BUS_OFFS);
+}
+
+static int orion5x_pci_hw_rd_conf(int bus, int dev, u32 func,
+					u32 where, u32 size, u32 *val)
+{
+	unsigned long flags;
+	spin_lock_irqsave(&orion5x_pci_lock, flags);
+
+	writel(PCI_CONF_BUS(bus) |
+		PCI_CONF_DEV(dev) | PCI_CONF_REG(where) |
+		PCI_CONF_FUNC(func) | PCI_CONF_ADDR_EN, PCI_CONF_ADDR);
+
+	*val = readl(PCI_CONF_DATA);
+
+	if (size == 1)
+		*val = (*val >> (8*(where & 0x3))) & 0xff;
+	else if (size == 2)
+		*val = (*val >> (8*(where & 0x3))) & 0xffff;
+
+	spin_unlock_irqrestore(&orion5x_pci_lock, flags);
+
+	return PCIBIOS_SUCCESSFUL;
+}
+
+static int orion5x_pci_hw_wr_conf(int bus, int dev, u32 func,
+					u32 where, u32 size, u32 val)
+{
+	unsigned long flags;
+	int ret = PCIBIOS_SUCCESSFUL;
+
+	spin_lock_irqsave(&orion5x_pci_lock, flags);
+
+	writel(PCI_CONF_BUS(bus) |
+		PCI_CONF_DEV(dev) | PCI_CONF_REG(where) |
+		PCI_CONF_FUNC(func) | PCI_CONF_ADDR_EN, PCI_CONF_ADDR);
+
+	if (size == 4) {
+		__raw_writel(val, PCI_CONF_DATA);
+	} else if (size == 2) {
+		__raw_writew(val, PCI_CONF_DATA + (where & 0x3));
+	} else if (size == 1) {
+		__raw_writeb(val, PCI_CONF_DATA + (where & 0x3));
+	} else {
+		ret = PCIBIOS_BAD_REGISTER_NUMBER;
+	}
+
+	spin_unlock_irqrestore(&orion5x_pci_lock, flags);
+
+	return ret;
+}
+
+static int orion5x_pci_valid_config(int bus, u32 devfn)
+{
+	if (bus == orion5x_pci_local_bus_nr()) {
+		/*
+		 * Don't go out for local device
+		 */
+		if (PCI_SLOT(devfn) == 0 && PCI_FUNC(devfn) != 0)
+			return 0;
+
+		/*
+		 * When the PCI signals are directly connected to a
+		 * Cardbus slot, ignore all but device IDs 0 and 1.
+		 */
+		if (orion5x_pci_cardbus_mode && PCI_SLOT(devfn) > 1)
+			return 0;
+	}
+
+	return 1;
+}
+
+static int orion5x_pci_rd_conf(struct pci_bus *bus, u32 devfn,
+				int where, int size, u32 *val)
+{
+	if (!orion5x_pci_valid_config(bus->number, devfn)) {
+		*val = 0xffffffff;
+		return PCIBIOS_DEVICE_NOT_FOUND;
+	}
+
+	return orion5x_pci_hw_rd_conf(bus->number, PCI_SLOT(devfn),
+					PCI_FUNC(devfn), where, size, val);
+}
+
+static int orion5x_pci_wr_conf(struct pci_bus *bus, u32 devfn,
+				int where, int size, u32 val)
+{
+	if (!orion5x_pci_valid_config(bus->number, devfn))
+		return PCIBIOS_DEVICE_NOT_FOUND;
+
+	return orion5x_pci_hw_wr_conf(bus->number, PCI_SLOT(devfn),
+					PCI_FUNC(devfn), where, size, val);
+}
+
+static struct pci_ops pci_ops = {
+	.read = orion5x_pci_rd_conf,
+	.write = orion5x_pci_wr_conf,
+};
+
+static void __init orion5x_pci_set_bus_nr(int nr)
+{
+	u32 p2p = readl(PCI_P2P_CONF);
+
+	if (readl(PCI_MODE) & PCI_MODE_PCIX) {
+		/*
+		 * PCI-X mode
+		 */
+		u32 pcix_status, bus, dev;
+		bus = (p2p & PCI_P2P_BUS_MASK) >> PCI_P2P_BUS_OFFS;
+		dev = (p2p & PCI_P2P_DEV_MASK) >> PCI_P2P_DEV_OFFS;
+		orion5x_pci_hw_rd_conf(bus, dev, 0, PCIX_STAT, 4, &pcix_status);
+		pcix_status &= ~PCIX_STAT_BUS_MASK;
+		pcix_status |= (nr << PCIX_STAT_BUS_OFFS);
+		orion5x_pci_hw_wr_conf(bus, dev, 0, PCIX_STAT, 4, pcix_status);
+	} else {
+		/*
+		 * PCI Conventional mode
+		 */
+		p2p &= ~PCI_P2P_BUS_MASK;
+		p2p |= (nr << PCI_P2P_BUS_OFFS);
+		writel(p2p, PCI_P2P_CONF);
+	}
+}
+
+static void __init orion5x_pci_master_slave_enable(void)
+{
+	int bus_nr, func, reg;
+	u32 val;
+
+	bus_nr = orion5x_pci_local_bus_nr();
+	func = PCI_CONF_FUNC_STAT_CMD;
+	reg = PCI_CONF_REG_STAT_CMD;
+	orion5x_pci_hw_rd_conf(bus_nr, 0, func, reg, 4, &val);
+	val |= (PCI_COMMAND_IO | PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER);
+	orion5x_pci_hw_wr_conf(bus_nr, 0, func, reg, 4, val | 0x7);
+}
+
+static void __init orion5x_setup_pci_wins(void)
+{
+	const struct mbus_dram_target_info *dram = mv_mbus_dram_info();
+	u32 win_enable;
+	int bus;
+	int i;
+
+	/*
+	 * First, disable windows.
+	 */
+	win_enable = 0xffffffff;
+	writel(win_enable, PCI_BAR_ENABLE);
+
+	/*
+	 * Setup windows for DDR banks.
+	 */
+	bus = orion5x_pci_local_bus_nr();
+
+	for (i = 0; i < dram->num_cs; i++) {
+		const struct mbus_dram_window *cs = dram->cs + i;
+		u32 func = PCI_CONF_FUNC_BAR_CS(cs->cs_index);
+		u32 reg;
+		u32 val;
+
+		/*
+		 * Write DRAM bank base address register.
+		 */
+		reg = PCI_CONF_REG_BAR_LO_CS(cs->cs_index);
+		orion5x_pci_hw_rd_conf(bus, 0, func, reg, 4, &val);
+		val = (cs->base & 0xfffff000) | (val & 0xfff);
+		orion5x_pci_hw_wr_conf(bus, 0, func, reg, 4, val);
+
+		/*
+		 * Write DRAM bank size register.
+		 */
+		reg = PCI_CONF_REG_BAR_HI_CS(cs->cs_index);
+		orion5x_pci_hw_wr_conf(bus, 0, func, reg, 4, 0);
+		writel((cs->size - 1) & 0xfffff000,
+			PCI_BAR_SIZE_DDR_CS(cs->cs_index));
+		writel(cs->base & 0xfffff000,
+			PCI_BAR_REMAP_DDR_CS(cs->cs_index));
+
+		/*
+		 * Enable decode window for this chip select.
+		 */
+		win_enable &= ~(1 << cs->cs_index);
+	}
+
+	/*
+	 * Re-enable decode windows.
+	 */
+	writel(win_enable, PCI_BAR_ENABLE);
+
+	/*
+	 * Disable automatic update of address remapping when writing to BARs.
+	 */
+	orion5x_setbits(PCI_ADDR_DECODE_CTRL, 1);
+}
+
+static int __init pci_setup(struct pci_sys_data *sys)
+{
+	struct resource *res;
+
+	/*
+	 * Point PCI unit MBUS decode windows to DRAM space.
+	 */
+	orion5x_setup_pci_wins();
+
+	/*
+	 * Master + Slave enable
+	 */
+	orion5x_pci_master_slave_enable();
+
+	/*
+	 * Force ordering
+	 */
+	orion5x_setbits(PCI_CMD, PCI_CMD_HOST_REORDER);
+
+	pci_ioremap_io(sys->busnr * SZ_64K, ORION5X_PCI_IO_PHYS_BASE);
+
+	/*
+	 * Request resources
+	 */
+	res = kzalloc(sizeof(struct resource), GFP_KERNEL);
+	if (!res)
+		panic("pci_setup unable to alloc resources");
+
+	/*
+	 * IORESOURCE_MEM
+	 */
+	res->name = "PCI Memory Space";
+	res->flags = IORESOURCE_MEM;
+	res->start = ORION5X_PCI_MEM_PHYS_BASE;
+	res->end = res->start + ORION5X_PCI_MEM_SIZE - 1;
+	if (request_resource(&iomem_resource, res))
+		panic("Request PCI Memory resource failed\n");
+	pci_add_resource_offset(&sys->resources, res, sys->mem_offset);
+
+	return 1;
+}
+
+
+/*****************************************************************************
+ * General PCIe + PCI
+ ****************************************************************************/
+static void rc_pci_fixup(struct pci_dev *dev)
+{
+	/*
+	 * Prevent enumeration of root complex.
+	 */
+	if (dev->bus->parent == NULL && dev->devfn == 0) {
+		int i;
+
+		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 orion5x_pci_disabled __initdata;
+
+void __init orion5x_pci_disable(void)
+{
+	orion5x_pci_disabled = 1;
+}
+
+void __init orion5x_pci_set_cardbus_mode(void)
+{
+	orion5x_pci_cardbus_mode = 1;
+}
+
+int __init orion5x_pci_sys_setup(int nr, struct pci_sys_data *sys)
+{
+	int ret = 0;
+
+	vga_base = ORION5X_PCIE_MEM_PHYS_BASE;
+
+	if (nr == 0) {
+		orion_pcie_set_local_bus_nr(PCIE_BASE, sys->busnr);
+		ret = pcie_setup(sys);
+	} else if (nr == 1 && !orion5x_pci_disabled) {
+		orion5x_pci_set_bus_nr(sys->busnr);
+		ret = pci_setup(sys);
+	}
+
+	return ret;
+}
+
+struct pci_bus __init *orion5x_pci_sys_scan_bus(int nr, struct pci_sys_data *sys)
+{
+	struct pci_bus *bus;
+
+	if (nr == 0) {
+		bus = pci_scan_root_bus(NULL, sys->busnr, &pcie_ops, sys,
+					&sys->resources);
+	} else if (nr == 1 && !orion5x_pci_disabled) {
+		bus = pci_scan_root_bus(NULL, sys->busnr, &pci_ops, sys,
+					&sys->resources);
+	} else {
+		bus = NULL;
+		BUG();
+	}
+
+	return bus;
+}
+
+int __init orion5x_pci_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
+{
+	int bus = dev->bus->number;
+
+	/*
+	 * PCIe endpoint?
+	 */
+	if (orion5x_pci_disabled || bus < orion5x_pci_local_bus_nr())
+		return IRQ_ORION5X_PCIE0_INT;
+
+	return -1;
+}
-- 
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