[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>
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 0362391..37aa3c6 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -336,6 +336,7 @@
config ARCH_ORION
bool "Marvell Orion"
depends on MMU
+ select PCI
help
Support for Marvell Orion System on Chip family.
diff --git a/arch/arm/mach-orion/Makefile b/arch/arm/mach-orion/Makefile
index 69eb301..2937f05 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 224b446..02d0fec 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 0000000..cf569c6
--- /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;
+}