1 files changed, 179 insertions, 70 deletions

diff --git a/arch/arm/mach-kirkwood/pcie.c b/arch/arm/mach-kirkwood/pcie.c
index 73fccacd1a7..12d86f39f38 100644
--- a/arch/arm/mach-kirkwood/pcie.c
+++ b/arch/arm/mach-kirkwood/pcie.c
@@ -10,35 +10,82 @@
 
 #include <linux/kernel.h>
 #include <linux/pci.h>
+#include <linux/slab.h>
+#include <linux/clk.h>
 #include <linux/mbus.h>
+#include <video/vga.h>
 #include <asm/irq.h>
 #include <asm/mach/pci.h>
 #include <plat/pcie.h>
+#include <mach/bridge-regs.h>
 #include "common.h"
 
+/* These can go away once Kirkwood uses the mvebu-mbus DT binding */
+#define KIRKWOOD_MBUS_PCIE0_MEM_TARGET    0x4
+#define KIRKWOOD_MBUS_PCIE0_MEM_ATTR      0xe8
+#define KIRKWOOD_MBUS_PCIE0_IO_TARGET     0x4
+#define KIRKWOOD_MBUS_PCIE0_IO_ATTR       0xe0
+#define KIRKWOOD_MBUS_PCIE1_MEM_TARGET    0x4
+#define KIRKWOOD_MBUS_PCIE1_MEM_ATTR      0xd8
+#define KIRKWOOD_MBUS_PCIE1_IO_TARGET     0x4
+#define KIRKWOOD_MBUS_PCIE1_IO_ATTR       0xd0
+
+static void kirkwood_enable_pcie_clk(const char *port)
+{
+	struct clk *clk;
 
-#define PCIE_BASE	((void __iomem *)PCIE_VIRT_BASE)
+	clk = clk_get_sys("pcie", port);
+	if (IS_ERR(clk)) {
+		pr_err("PCIE clock %s missing\n", port);
+		return;
+	}
+	clk_prepare_enable(clk);
+	clk_put(clk);
+}
+
+/* This function is called very early in the boot when probing the
+   hardware to determine what we actually are, and what rate tclk is
+   ticking at. Hence calling kirkwood_enable_pcie_clk() is not
+   possible since the clk tree has not been created yet. */
+void kirkwood_enable_pcie(void)
+{
+	u32 curr = readl(CLOCK_GATING_CTRL);
+	if (!(curr & CGC_PEX0))
+		writel(curr | CGC_PEX0, CLOCK_GATING_CTRL);
+}
 
-void __init kirkwood_pcie_id(u32 *dev, u32 *rev)
+void kirkwood_pcie_id(u32 *dev, u32 *rev)
 {
-	*dev = orion_pcie_dev_id(PCIE_BASE);
-	*rev = orion_pcie_rev(PCIE_BASE);
+	kirkwood_enable_pcie();
+	*dev = orion_pcie_dev_id(PCIE_VIRT_BASE);
+	*rev = orion_pcie_rev(PCIE_VIRT_BASE);
 }
 
-static int pcie_valid_config(int bus, int dev)
+struct pcie_port {
+	u8			root_bus_nr;
+	void __iomem		*base;
+	spinlock_t		conf_lock;
+	int			irq;
+	struct resource		res;
+};
+
+static int pcie_port_map[2];
+static int num_pcie_ports;
+
+static int pcie_valid_config(struct pcie_port *pp, 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)
+	if (bus == pp->root_bus_nr && dev == 0)
 		return 1;
 
-	if (!orion_pcie_link_up(PCIE_BASE))
+	if (!orion_pcie_link_up(pp->base))
 		return 0;
 
-	if (bus == 0 && dev != 1)
+	if (bus == pp->root_bus_nr && dev != 1)
 		return 0;
 
 	return 1;
@@ -50,22 +97,23 @@ static int pcie_valid_config(int bus, int dev)
  * and then reading the PCIE_CONF_DATA register. Need to make sure these
  * transactions are atomic.
  */
-static DEFINE_SPINLOCK(kirkwood_pcie_lock);
 
 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(bus->number, PCI_SLOT(devfn)) == 0) {
+	if (pcie_valid_config(pp, bus->number, PCI_SLOT(devfn)) == 0) {
 		*val = 0xffffffff;
 		return PCIBIOS_DEVICE_NOT_FOUND;
 	}
 
-	spin_lock_irqsave(&kirkwood_pcie_lock, flags);
-	ret = orion_pcie_rd_conf(PCIE_BASE, bus, devfn, where, size, val);
-	spin_unlock_irqrestore(&kirkwood_pcie_lock, flags);
+	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;
 }
@@ -73,15 +121,17 @@ static int pcie_rd_conf(struct pci_bus *bus, u32 devfn, int where,
 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(bus->number, PCI_SLOT(devfn)) == 0)
+	if (pcie_valid_config(pp, bus->number, PCI_SLOT(devfn)) == 0)
 		return PCIBIOS_DEVICE_NOT_FOUND;
 
-	spin_lock_irqsave(&kirkwood_pcie_lock, flags);
-	ret = orion_pcie_wr_conf(PCIE_BASE, bus, devfn, where, size, val);
-	spin_unlock_irqrestore(&kirkwood_pcie_lock, flags);
+	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;
 }
@@ -91,59 +141,96 @@ static struct pci_ops pcie_ops = {
 	.write = pcie_wr_conf,
 };
 
-
-static int kirkwood_pcie_setup(int nr, struct pci_sys_data *sys)
+static void __init pcie0_ioresources_init(struct pcie_port *pp)
 {
-	struct resource *res;
+	pp->base = PCIE_VIRT_BASE;
+	pp->irq	= IRQ_KIRKWOOD_PCIE;
 
 	/*
-	 * Generic PCIe unit setup.
+	 * IORESOURCE_MEM
 	 */
-	orion_pcie_setup(PCIE_BASE, &kirkwood_mbus_dram_info);
+	pp->res.name = "PCIe 0 MEM";
+	pp->res.start = KIRKWOOD_PCIE_MEM_PHYS_BASE;
+	pp->res.end = pp->res.start + KIRKWOOD_PCIE_MEM_SIZE - 1;
+	pp->res.flags = IORESOURCE_MEM;
+}
 
-	/*
-	 * Request resources.
-	 */
-	res = kzalloc(sizeof(struct resource) * 2, GFP_KERNEL);
-	if (!res)
-		panic("pcie_setup unable to alloc resources");
+static void __init pcie1_ioresources_init(struct pcie_port *pp)
+{
+	pp->base = PCIE1_VIRT_BASE;
+	pp->irq	= IRQ_KIRKWOOD_PCIE1;
 
 	/*
-	 * IORESOURCE_IO
+	 * IORESOURCE_MEM
 	 */
-	res[0].name = "PCIe I/O Space";
-	res[0].flags = IORESOURCE_IO;
-	res[0].start = KIRKWOOD_PCIE_IO_PHYS_BASE;
-	res[0].end = res[0].start + KIRKWOOD_PCIE_IO_SIZE - 1;
-	if (request_resource(&ioport_resource, &res[0]))
-		panic("Request PCIe IO resource failed\n");
-	sys->resource[0] = &res[0];
+	pp->res.name = "PCIe 1 MEM";
+	pp->res.start = KIRKWOOD_PCIE1_MEM_PHYS_BASE;
+	pp->res.end = pp->res.start + KIRKWOOD_PCIE1_MEM_SIZE - 1;
+	pp->res.flags = IORESOURCE_MEM;
+}
+
+static int __init kirkwood_pcie_setup(int nr, struct pci_sys_data *sys)
+{
+	struct pcie_port *pp;
+	int index;
+
+	if (nr >= num_pcie_ports)
+		return 0;
+
+	index = pcie_port_map[nr];
+	pr_info("PCI: bus%d uses PCIe port %d\n", sys->busnr, index);
+
+	pp = kzalloc(sizeof(*pp), GFP_KERNEL);
+	if (!pp)
+		panic("PCIe: failed to allocate pcie_port data");
+	sys->private_data = pp;
+	pp->root_bus_nr = sys->busnr;
+	spin_lock_init(&pp->conf_lock);
+
+	switch (index) {
+	case 0:
+		kirkwood_enable_pcie_clk("0");
+		pcie0_ioresources_init(pp);
+		pci_ioremap_io(SZ_64K * sys->busnr, KIRKWOOD_PCIE_IO_PHYS_BASE);
+		break;
+	case 1:
+		kirkwood_enable_pcie_clk("1");
+		pcie1_ioresources_init(pp);
+		pci_ioremap_io(SZ_64K * sys->busnr,
+			       KIRKWOOD_PCIE1_IO_PHYS_BASE);
+		break;
+	default:
+		panic("PCIe setup: invalid controller %d", index);
+	}
+
+	if (request_resource(&iomem_resource, &pp->res))
+		panic("Request PCIe%d Memory resource failed\n", index);
+
+	pci_add_resource_offset(&sys->resources, &pp->res, sys->mem_offset);
 
 	/*
-	 * IORESOURCE_MEM
+	 * Generic PCIe unit setup.
 	 */
-	res[1].name = "PCIe Memory Space";
-	res[1].flags = IORESOURCE_MEM;
-	res[1].start = KIRKWOOD_PCIE_MEM_PHYS_BASE;
-	res[1].end = res[1].start + KIRKWOOD_PCIE_MEM_SIZE - 1;
-	if (request_resource(&iomem_resource, &res[1]))
-		panic("Request PCIe Memory resource failed\n");
-	sys->resource[1] = &res[1];
+	orion_pcie_set_local_bus_nr(pp->base, sys->busnr);
 
-	sys->resource[2] = NULL;
-	sys->io_offset = 0;
+	orion_pcie_setup(pp->base);
 
 	return 1;
 }
 
-static void __devinit rc_pci_fixup(struct pci_dev *dev)
+/*
+ * 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)
 {
-	/*
-	 * Prevent enumeration of root complex.
-	 */
 	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;
@@ -153,35 +240,57 @@ static void __devinit rc_pci_fixup(struct pci_dev *dev)
 }
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_MARVELL, PCI_ANY_ID, rc_pci_fixup);
 
-static struct pci_bus __init *
-kirkwood_pcie_scan_bus(int nr, struct pci_sys_data *sys)
+static int __init kirkwood_pcie_map_irq(const struct pci_dev *dev, u8 slot,
+	u8 pin)
 {
-	struct pci_bus *bus;
-
-	if (nr == 0) {
-		bus = pci_scan_bus(sys->busnr, &pcie_ops, sys);
-	} else {
-		bus = NULL;
-		BUG();
-	}
-
-	return bus;
-}
+	struct pci_sys_data *sys = dev->sysdata;
+	struct pcie_port *pp = sys->private_data;
 
-static int __init kirkwood_pcie_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
-{
-	return IRQ_KIRKWOOD_PCIE;
+	return pp->irq;
 }
 
 static struct hw_pci kirkwood_pci __initdata = {
-	.nr_controllers	= 1,
-	.swizzle	= pci_std_swizzle,
 	.setup		= kirkwood_pcie_setup,
-	.scan		= kirkwood_pcie_scan_bus,
 	.map_irq	= kirkwood_pcie_map_irq,
+	.ops            = &pcie_ops,
 };
 
-void __init kirkwood_pcie_init(void)
+static void __init add_pcie_port(int index, void __iomem *base)
+{
+	pcie_port_map[num_pcie_ports++] = index;
+	pr_info("Kirkwood PCIe port %d: link %s\n", index,
+		orion_pcie_link_up(base) ? "up" : "down");
+}
+
+void __init kirkwood_pcie_init(unsigned int portmask)
 {
+	mvebu_mbus_add_window_remap_by_id(KIRKWOOD_MBUS_PCIE0_IO_TARGET,
+					  KIRKWOOD_MBUS_PCIE0_IO_ATTR,
+					  KIRKWOOD_PCIE_IO_PHYS_BASE,
+					  KIRKWOOD_PCIE_IO_SIZE,
+					  KIRKWOOD_PCIE_IO_BUS_BASE);
+	mvebu_mbus_add_window_by_id(KIRKWOOD_MBUS_PCIE0_MEM_TARGET,
+				    KIRKWOOD_MBUS_PCIE0_MEM_ATTR,
+				    KIRKWOOD_PCIE_MEM_PHYS_BASE,
+				    KIRKWOOD_PCIE_MEM_SIZE);
+	mvebu_mbus_add_window_remap_by_id(KIRKWOOD_MBUS_PCIE1_IO_TARGET,
+					  KIRKWOOD_MBUS_PCIE1_IO_ATTR,
+					  KIRKWOOD_PCIE1_IO_PHYS_BASE,
+					  KIRKWOOD_PCIE1_IO_SIZE,
+					  KIRKWOOD_PCIE1_IO_BUS_BASE);
+	mvebu_mbus_add_window_by_id(KIRKWOOD_MBUS_PCIE1_MEM_TARGET,
+				    KIRKWOOD_MBUS_PCIE1_MEM_ATTR,
+				    KIRKWOOD_PCIE1_MEM_PHYS_BASE,
+				    KIRKWOOD_PCIE1_MEM_SIZE);
+
+	vga_base = KIRKWOOD_PCIE_MEM_PHYS_BASE;
+
+	if (portmask & KW_PCIE0)
+		add_pcie_port(0, PCIE_VIRT_BASE);
+
+	if (portmask & KW_PCIE1)
+		add_pcie_port(1, PCIE1_VIRT_BASE);
+
+	kirkwood_pci.nr_controllers = num_pcie_ports;
 	pci_common_init(&kirkwood_pci);
 }