[ARM] Orion: PCI support

This patch adds support for PCI and PCI-E controllers in the
Orion, Orion-NAS and Orion2.

Signed-off-by: Tzachi Perelstein <tzachi@marvell.com>
Reviewed-by: Nicolas Pitre <nico@marvell.com>
Reviewed-by: Lennert Buytenhek <buytenh@marvell.com>
Acked-by: Russell King <rmk+kernel@arm.linux.org.uk>

3 files changed, 575 insertions, 1 deletions

diff --git a/arch/arm/mach-orion/Makefile b/arch/arm/mach-orion/Makefile
index 69eb3018773..2937f05b868 100644
--- a/arch/arm/mach-orion/Makefile
+++ b/arch/arm/mach-orion/Makefile
@@ -1 +1 @@
-obj-y  += common.o
+obj-y  += common.o pci.o
diff --git a/arch/arm/mach-orion/common.h b/arch/arm/mach-orion/common.h
index 224b44618a7..02d0fec44a4 100644
--- a/arch/arm/mach-orion/common.h
+++ b/arch/arm/mach-orion/common.h
@@ -6,4 +6,21 @@
  */
 void __init orion_map_io(void);
 
+/*
+ * Shared code used internally by other Orion core functions.
+ * (/mach-orion/pci.c)
+ */
+
+struct pci_sys_data;
+struct pci_bus;
+
+void orion_pcie_id(u32 *dev, u32 *rev);
+u32 orion_pcie_local_bus_nr(void);
+u32 orion_pci_local_bus_nr(void);
+u32 orion_pci_local_dev_nr(void);
+int orion_pci_sys_setup(int nr, struct pci_sys_data *sys);
+struct pci_bus *orion_pci_sys_scan_bus(int nr, struct pci_sys_data *sys);
+int orion_pci_hw_rd_conf(u32 bus, u32 dev, u32 func, u32 where, u32 size, u32 *val);
+int orion_pci_hw_wr_conf(u32 bus, u32 dev, u32 func, u32 where, u32 size, u32 val);
+
 #endif /* __ARCH_ORION_COMMON_H__ */
diff --git a/arch/arm/mach-orion/pci.c b/arch/arm/mach-orion/pci.c
new file mode 100644
index 00000000000..cf569c64711
--- /dev/null
+++ b/arch/arm/mach-orion/pci.c
@@ -0,0 +1,557 @@
+/*
+ * arch/arm/mach-orion/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 <asm/mach/pci.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_CTRL		ORION_PCIE_REG(0x1a00)
+#define PCIE_STAT		ORION_PCIE_REG(0x1a04)
+#define PCIE_DEV_ID		ORION_PCIE_REG(0x0000)
+#define PCIE_CMD_STAT		ORION_PCIE_REG(0x0004)
+#define PCIE_DEV_REV		ORION_PCIE_REG(0x0008)
+#define PCIE_MASK		ORION_PCIE_REG(0x1910)
+#define PCIE_CONF_ADDR		ORION_PCIE_REG(0x18f8)
+#define PCIE_CONF_DATA		ORION_PCIE_REG(0x18fc)
+
+/*
+ * PCIE_STAT bits
+ */
+#define PCIE_STAT_LINK_DOWN		1
+#define PCIE_STAT_BUS_OFFS		8
+#define PCIE_STAT_BUS_MASK		(0xff << PCIE_STAT_BUS_OFFS)
+#define PCIE_STAT_DEV_OFFS		20
+#define PCIE_STAT_DEV_MASK		(0x1f << PCIE_STAT_DEV_OFFS)
+
+/*
+ * PCIE_CONF_ADDR bits
+ */
+#define PCIE_CONF_REG(r)		((((r) & 0xf00) << 24) | ((r) & 0xfc))
+#define PCIE_CONF_FUNC(f)		(((f) & 0x3) << 8)
+#define PCIE_CONF_DEV(d)		(((d) & 0x1f) << 11)
+#define PCIE_CONF_BUS(b)		(((b) & 0xff) << 16)
+#define PCIE_CONF_ADDR_EN		(1 << 31)
+
+/*
+ * 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(orion_pcie_lock);
+
+void orion_pcie_id(u32 *dev, u32 *rev)
+{
+	*dev = orion_read(PCIE_DEV_ID) >> 16;
+	*rev = orion_read(PCIE_DEV_REV) & 0xff;
+}
+
+u32 orion_pcie_local_bus_nr(void)
+{
+	u32 stat = orion_read(PCIE_STAT);
+	return((stat & PCIE_STAT_BUS_MASK) >> PCIE_STAT_BUS_OFFS);
+}
+
+static u32 orion_pcie_local_dev_nr(void)
+{
+	u32 stat = orion_read(PCIE_STAT);
+	return((stat & PCIE_STAT_DEV_MASK) >> PCIE_STAT_DEV_OFFS);
+}
+
+static u32 orion_pcie_no_link(void)
+{
+	u32 stat = orion_read(PCIE_STAT);
+	return(stat & PCIE_STAT_LINK_DOWN);
+}
+
+static void orion_pcie_set_bus_nr(int nr)
+{
+	orion_clrbits(PCIE_STAT, PCIE_STAT_BUS_MASK);
+	orion_setbits(PCIE_STAT, nr << PCIE_STAT_BUS_OFFS);
+}
+
+static void orion_pcie_master_slave_enable(void)
+{
+	orion_setbits(PCIE_CMD_STAT, PCI_COMMAND_MASTER |
+					  PCI_COMMAND_IO |
+					  PCI_COMMAND_MEMORY);
+}
+
+static void orion_pcie_enable_interrupts(void)
+{
+	/*
+	 * Enable interrupts lines
+	 * INTA[24] INTB[25] INTC[26] INTD[27]
+	 */
+	orion_setbits(PCIE_MASK, 0xf<<24);
+}
+
+static int orion_pcie_valid_config(u32 bus, u32 dev)
+{
+	/*
+	 * Don't go out when trying to access --
+	 * 1. our own device
+	 * 2. where there's no device connected (no link)
+	 * 3. nonexisting devices on local bus
+	 */
+
+	if ((orion_pcie_local_bus_nr() == bus) &&
+	   (orion_pcie_local_dev_nr() == dev))
+		return 0;
+
+	if (orion_pcie_no_link())
+		return 0;
+
+	if (bus == orion_pcie_local_bus_nr())
+		if (((orion_pcie_local_dev_nr() == 0) && (dev != 1)) ||
+		   ((orion_pcie_local_dev_nr() != 0) && (dev != 0)))
+		return 0;
+
+	return 1;
+}
+
+static int orion_pcie_rd_conf(struct pci_bus *bus, u32 devfn, int where,
+						int size, u32 *val)
+{
+	unsigned long flags;
+	unsigned int dev, rev, pcie_addr;
+
+	if (orion_pcie_valid_config(bus->number, PCI_SLOT(devfn)) == 0) {
+		*val = 0xffffffff;
+		return PCIBIOS_DEVICE_NOT_FOUND;
+	}
+
+	spin_lock_irqsave(&orion_pcie_lock, flags);
+
+	orion_write(PCIE_CONF_ADDR, PCIE_CONF_BUS(bus->number) |
+			PCIE_CONF_DEV(PCI_SLOT(devfn)) |
+			PCIE_CONF_FUNC(PCI_FUNC(devfn)) |
+			PCIE_CONF_REG(where) | PCIE_CONF_ADDR_EN);
+
+	orion_pcie_id(&dev, &rev);
+	if (dev == MV88F5182_DEV_ID) {
+		/* extended register space */
+		pcie_addr = ORION_PCIE_WA_BASE;
+		pcie_addr |= PCIE_CONF_BUS(bus->number) |
+			PCIE_CONF_DEV(PCI_SLOT(devfn)) |
+			PCIE_CONF_FUNC(PCI_FUNC(devfn)) |
+			PCIE_CONF_REG(where);
+		*val = orion_read(pcie_addr);
+	} else
+		*val = orion_read(PCIE_CONF_DATA);
+
+	if (size == 1)
+		*val = (*val >> (8*(where & 0x3))) & 0xff;
+	else if (size == 2)
+		*val = (*val >> (8*(where & 0x3))) & 0xffff;
+
+	spin_unlock_irqrestore(&orion_pcie_lock, flags);
+
+	return PCIBIOS_SUCCESSFUL;
+}
+
+
+static int orion_pcie_wr_conf(struct pci_bus *bus, u32 devfn, int where,
+						int size, u32 val)
+{
+	unsigned long flags;
+	int ret;
+
+	if (orion_pcie_valid_config(bus->number, PCI_SLOT(devfn)) == 0)
+		return PCIBIOS_DEVICE_NOT_FOUND;
+
+	spin_lock_irqsave(&orion_pcie_lock, flags);
+
+	ret = PCIBIOS_SUCCESSFUL;
+
+	orion_write(PCIE_CONF_ADDR, PCIE_CONF_BUS(bus->number) |
+			PCIE_CONF_DEV(PCI_SLOT(devfn)) |
+			PCIE_CONF_FUNC(PCI_FUNC(devfn)) |
+			PCIE_CONF_REG(where) | PCIE_CONF_ADDR_EN);
+
+	if (size == 4) {
+		__raw_writel(val, PCIE_CONF_DATA);
+	} else if (size == 2) {
+		__raw_writew(val, PCIE_CONF_DATA + (where & 0x3));
+	} else if (size == 1) {
+		__raw_writeb(val, PCIE_CONF_DATA + (where & 0x3));
+	} else {
+		ret = PCIBIOS_BAD_REGISTER_NUMBER;
+	}
+
+	spin_unlock_irqrestore(&orion_pcie_lock, flags);
+
+	return ret;
+}
+
+struct pci_ops orion_pcie_ops = {
+	.read = orion_pcie_rd_conf,
+	.write = orion_pcie_wr_conf,
+};
+
+
+static int orion_pcie_setup(struct pci_sys_data *sys)
+{
+	struct resource *res;
+
+	/*
+	 * Master + Slave enable
+	 */
+	orion_pcie_master_slave_enable();
+
+	/*
+	 * Enable interrupts lines A-D
+	 */
+	orion_pcie_enable_interrupts();
+
+	/*
+	 * Request resource
+	 */
+	res = kzalloc(sizeof(struct resource) * 2, GFP_KERNEL);
+	if (!res)
+		panic("orion_pci_setup unable to alloc resources");
+
+	/*
+	 * IORESOURCE_IO
+	 */
+	res[0].name = "PCI-EX I/O Space";
+	res[0].flags = IORESOURCE_IO;
+	res[0].start = ORION_PCIE_IO_REMAP;
+	res[0].end = res[0].start + ORION_PCIE_IO_SIZE - 1;
+	if (request_resource(&ioport_resource, &res[0]))
+		panic("Request PCIE IO resource failed\n");
+	sys->resource[0] = &res[0];
+
+	/*
+	 * IORESOURCE_MEM
+	 */
+	res[1].name = "PCI-EX Memory Space";
+	res[1].flags = IORESOURCE_MEM;
+	res[1].start = ORION_PCIE_MEM_BASE;
+	res[1].end = res[1].start + ORION_PCIE_MEM_SIZE - 1;
+	if (request_resource(&iomem_resource, &res[1]))
+		panic("Request PCIE Memory resource failed\n");
+	sys->resource[1] = &res[1];
+
+	sys->resource[2] = NULL;
+	sys->io_offset = 0;
+
+	return 1;
+}
+
+/*****************************************************************************
+ * PCI controller
+ ****************************************************************************/
+#define PCI_MODE		ORION_PCI_REG(0xd00)
+#define PCI_CMD			ORION_PCI_REG(0xc00)
+#define PCI_P2P_CONF		ORION_PCI_REG(0x1d14)
+#define PCI_CONF_ADDR		ORION_PCI_REG(0xc78)
+#define PCI_CONF_DATA		ORION_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 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(orion_pci_lock);
+
+u32 orion_pci_local_bus_nr(void)
+{
+	u32 conf = orion_read(PCI_P2P_CONF);
+	return((conf & PCI_P2P_BUS_MASK) >> PCI_P2P_BUS_OFFS);
+}
+
+u32 orion_pci_local_dev_nr(void)
+{
+	u32 conf = orion_read(PCI_P2P_CONF);
+	return((conf & PCI_P2P_DEV_MASK) >> PCI_P2P_DEV_OFFS);
+}
+
+int orion_pci_hw_rd_conf(u32 bus, u32 dev, u32 func,
+					u32 where, u32 size, u32 *val)
+{
+	unsigned long flags;
+	spin_lock_irqsave(&orion_pci_lock, flags);
+
+	orion_write(PCI_CONF_ADDR, PCI_CONF_BUS(bus) |
+			PCI_CONF_DEV(dev) | PCI_CONF_REG(where) |
+			PCI_CONF_FUNC(func) | PCI_CONF_ADDR_EN);
+
+	*val = orion_read(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(&orion_pci_lock, flags);
+
+	return PCIBIOS_SUCCESSFUL;
+}
+
+int orion_pci_hw_wr_conf(u32 bus, u32 dev, u32 func,
+					u32 where, u32 size, u32 val)
+{
+	unsigned long flags;
+	int ret = PCIBIOS_SUCCESSFUL;
+
+	spin_lock_irqsave(&orion_pci_lock, flags);
+
+	orion_write(PCI_CONF_ADDR, PCI_CONF_BUS(bus) |
+			PCI_CONF_DEV(dev) | PCI_CONF_REG(where) |
+			PCI_CONF_FUNC(func) | PCI_CONF_ADDR_EN);
+
+	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(&orion_pci_lock, flags);
+
+	return ret;
+}
+
+static int orion_pci_rd_conf(struct pci_bus *bus, u32 devfn,
+				int where, int size, u32 *val)
+{
+	/*
+	 * Don't go out for local device
+	 */
+	if ((orion_pci_local_bus_nr() == bus->number) &&
+	   (orion_pci_local_dev_nr() == PCI_SLOT(devfn))) {
+		*val = 0xffffffff;
+		return PCIBIOS_DEVICE_NOT_FOUND;
+	}
+
+	return orion_pci_hw_rd_conf(bus->number, PCI_SLOT(devfn),
+					PCI_FUNC(devfn), where, size, val);
+}
+
+static int orion_pci_wr_conf(struct pci_bus *bus, u32 devfn,
+				int where, int size, u32 val)
+{
+	/*
+	 * Don't go out for local device
+	 */
+	if ((orion_pci_local_bus_nr() == bus->number) &&
+	   (orion_pci_local_dev_nr() == PCI_SLOT(devfn)))
+		return PCIBIOS_DEVICE_NOT_FOUND;
+
+	return orion_pci_hw_wr_conf(bus->number, PCI_SLOT(devfn),
+					PCI_FUNC(devfn), where, size, val);
+}
+
+struct pci_ops orion_pci_ops = {
+	.read = orion_pci_rd_conf,
+	.write = orion_pci_wr_conf,
+};
+
+static void orion_pci_set_bus_nr(int nr)
+{
+	u32 p2p = orion_read(PCI_P2P_CONF);
+
+	if (orion_read(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;
+		orion_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);
+		orion_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);
+		orion_write(PCI_P2P_CONF, p2p);
+	}
+}
+
+static void orion_pci_master_slave_enable(void)
+{
+	u32 bus_nr, dev_nr, func, reg, val;
+
+	bus_nr = orion_pci_local_bus_nr();
+	dev_nr = orion_pci_local_dev_nr();
+	func = PCI_CONF_FUNC_STAT_CMD;
+	reg = PCI_CONF_REG_STAT_CMD;
+	orion_pci_hw_rd_conf(bus_nr, dev_nr, func, reg, 4, &val);
+	val |= (PCI_COMMAND_IO | PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER);
+	orion_pci_hw_wr_conf(bus_nr, dev_nr, func, reg, 4, val | 0x7);
+}
+
+static int orion_pci_setup(struct pci_sys_data *sys)
+{
+	struct resource *res;
+
+	/*
+	 * Master + Slave enable
+	 */
+	orion_pci_master_slave_enable();
+
+	/*
+	 * Force ordering
+	 */
+	orion_setbits(PCI_CMD, PCI_CMD_HOST_REORDER);
+
+	/*
+	 * Request resources
+	 */
+	res = kzalloc(sizeof(struct resource) * 2, GFP_KERNEL);
+	if (!res)
+		panic("orion_pci_setup unable to alloc resources");
+
+	/*
+	 * IORESOURCE_IO
+	 */
+	res[0].name = "PCI I/O Space";
+	res[0].flags = IORESOURCE_IO;
+	res[0].start = ORION_PCI_IO_REMAP;
+	res[0].end = res[0].start + ORION_PCI_IO_SIZE - 1;
+	if (request_resource(&ioport_resource, &res[0]))
+		panic("Request PCI IO resource failed\n");
+	sys->resource[0] = &res[0];
+
+	/*
+	 * IORESOURCE_MEM
+	 */
+	res[1].name = "PCI Memory Space";
+	res[1].flags = IORESOURCE_MEM;
+	res[1].start = ORION_PCI_MEM_BASE;
+	res[1].end = res[1].start + ORION_PCI_MEM_SIZE - 1;
+	if (request_resource(&iomem_resource, &res[1]))
+		panic("Request PCI Memory resource failed\n");
+	sys->resource[1] = &res[1];
+
+	sys->resource[2] = NULL;
+	sys->io_offset = 0;
+
+	return 1;
+}
+
+
+/*****************************************************************************
+ * General PCIE + PCI
+ ****************************************************************************/
+int orion_pci_sys_setup(int nr, struct pci_sys_data *sys)
+{
+	int ret = 0;
+
+	if (nr == 0) {
+		/*
+		 * PCIE setup
+		 */
+		orion_pcie_set_bus_nr(0);
+		ret = orion_pcie_setup(sys);
+	} else if (nr == 1) {
+		/*
+		 * PCI setup
+		 */
+		ret = orion_pci_setup(sys);
+	}
+
+	return ret;
+}
+
+struct pci_bus *orion_pci_sys_scan_bus(int nr, struct pci_sys_data *sys)
+{
+	struct pci_ops *ops;
+	struct pci_bus *bus;
+
+
+	if (nr == 0) {
+		u32 pci_bus;
+		/*
+		 * PCIE scan
+		 */
+		ops = &orion_pcie_ops;
+		bus = pci_scan_bus(sys->busnr, ops, sys);
+		/*
+		 * Set local PCI bus number to follow PCIE bridges (if any)
+		 */
+		pci_bus	= bus->number + bus->subordinate - bus->secondary + 1;
+		orion_pci_set_bus_nr(pci_bus);
+	} else if (nr == 1) {
+		/*
+		 * PCI scan
+		 */
+		ops = &orion_pci_ops;
+		bus = pci_scan_bus(sys->busnr, ops, sys);
+	} else {
+		BUG();
+		bus = NULL;
+	}
+
+	return bus;
+}