plat-orion: share PCIe handling code

Split off Orion PCIe handling code into plat-orion/.

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

2 files changed, 246 insertions, 1 deletions

diff --git a/arch/arm/plat-orion/Makefile b/arch/arm/plat-orion/Makefile
index ea4ce342a19..b33ecb60183 100644
--- a/arch/arm/plat-orion/Makefile
+++ b/arch/arm/plat-orion/Makefile
@@ -2,7 +2,7 @@
 # Makefile for the linux kernel.
 #
 
-obj-y	:= irq.o
+obj-y	:= irq.o pcie.o
 obj-m	:=
 obj-n	:=
 obj-	:=
diff --git a/arch/arm/plat-orion/pcie.c b/arch/arm/plat-orion/pcie.c
new file mode 100644
index 00000000000..f01966a330e
--- /dev/null
+++ b/arch/arm/plat-orion/pcie.c
@@ -0,0 +1,245 @@
+/*
+ * arch/arm/plat-orion/pcie.c
+ *
+ * Marvell Orion SoC PCIe handling.
+ *
+ * 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/mbus.h>
+#include <asm/mach/pci.h>
+#include <asm/plat-orion/pcie.h>
+
+/*
+ * PCIe unit register offsets.
+ */
+#define PCIE_DEV_ID_OFF		0x0000
+#define PCIE_CMD_OFF		0x0004
+#define PCIE_DEV_REV_OFF	0x0008
+#define PCIE_BAR_LO_OFF(n)	(0x0010 + ((n) << 3))
+#define PCIE_BAR_HI_OFF(n)	(0x0014 + ((n) << 3))
+#define PCIE_HEADER_LOG_4_OFF	0x0128
+#define PCIE_BAR_CTRL_OFF(n)	(0x1804 + ((n - 1) * 4))
+#define PCIE_WIN04_CTRL_OFF(n)	(0x1820 + ((n) << 4))
+#define PCIE_WIN04_BASE_OFF(n)	(0x1824 + ((n) << 4))
+#define PCIE_WIN04_REMAP_OFF(n)	(0x182c + ((n) << 4))
+#define PCIE_WIN5_CTRL_OFF	0x1880
+#define PCIE_WIN5_BASE_OFF	0x1884
+#define PCIE_WIN5_REMAP_OFF	0x188c
+#define PCIE_CONF_ADDR_OFF	0x18f8
+#define  PCIE_CONF_ADDR_EN		0x80000000
+#define  PCIE_CONF_REG(r)		((((r) & 0xf00) << 16) | ((r) & 0xfc))
+#define  PCIE_CONF_BUS(b)		(((b) & 0xff) << 16)
+#define  PCIE_CONF_DEV(d)		(((d) & 0x1f) << 11)
+#define  PCIE_CONF_FUNC(f)		(((f) & 0x3) << 8)
+#define PCIE_CONF_DATA_OFF	0x18fc
+#define PCIE_MASK_OFF		0x1910
+#define PCIE_CTRL_OFF		0x1a00
+#define PCIE_STAT_OFF		0x1a04
+#define  PCIE_STAT_DEV_OFFS		20
+#define  PCIE_STAT_DEV_MASK		0x1f
+#define  PCIE_STAT_BUS_OFFS		8
+#define  PCIE_STAT_BUS_MASK		0xff
+#define  PCIE_STAT_LINK_DOWN		1
+
+
+u32 __init orion_pcie_dev_id(void __iomem *base)
+{
+	return readl(base + PCIE_DEV_ID_OFF) >> 16;
+}
+
+u32 __init orion_pcie_rev(void __iomem *base)
+{
+	return readl(base + PCIE_DEV_REV_OFF) & 0xff;
+}
+
+int __init orion_pcie_link_up(void __iomem *base)
+{
+	return !(readl(base + PCIE_STAT_OFF) & PCIE_STAT_LINK_DOWN);
+}
+
+int __init orion_pcie_get_local_bus_nr(void __iomem *base)
+{
+	u32 stat = readl(base + PCIE_STAT_OFF);
+
+	return (stat >> PCIE_STAT_BUS_OFFS) & PCIE_STAT_BUS_MASK;
+}
+
+void __init orion_pcie_set_local_bus_nr(void __iomem *base, int nr)
+{
+	u32 stat;
+
+	stat = readl(base + PCIE_STAT_OFF);
+	stat &= ~(PCIE_STAT_BUS_MASK << PCIE_STAT_BUS_OFFS);
+	stat |= nr << PCIE_STAT_BUS_OFFS;
+	writel(stat, base + PCIE_STAT_OFF);
+}
+
+/*
+ * Setup PCIE BARs and Address Decode Wins:
+ * BAR[0,2] -> disabled, BAR[1] -> covers all DRAM banks
+ * WIN[0-3] -> DRAM bank[0-3]
+ */
+static void __init orion_pcie_setup_wins(void __iomem *base,
+					 struct mbus_dram_target_info *dram)
+{
+	u32 size;
+	int i;
+
+	/*
+	 * First, disable and clear BARs and windows.
+	 */
+	for (i = 1; i <= 2; i++) {
+		writel(0, base + PCIE_BAR_CTRL_OFF(i));
+		writel(0, base + PCIE_BAR_LO_OFF(i));
+		writel(0, base + PCIE_BAR_HI_OFF(i));
+	}
+
+	for (i = 0; i < 5; i++) {
+		writel(0, base + PCIE_WIN04_CTRL_OFF(i));
+		writel(0, base + PCIE_WIN04_BASE_OFF(i));
+		writel(0, base + PCIE_WIN04_REMAP_OFF(i));
+	}
+
+	writel(0, base + PCIE_WIN5_CTRL_OFF);
+	writel(0, base + PCIE_WIN5_BASE_OFF);
+	writel(0, base + PCIE_WIN5_REMAP_OFF);
+
+	/*
+	 * Setup windows for DDR banks.  Count total DDR size on the fly.
+	 */
+	size = 0;
+	for (i = 0; i < dram->num_cs; i++) {
+		struct mbus_dram_window *cs = dram->cs + i;
+
+		writel(cs->base & 0xffff0000, base + PCIE_WIN04_BASE_OFF(i));
+		writel(0, base + PCIE_WIN04_REMAP_OFF(i));
+		writel(((cs->size - 1) & 0xffff0000) |
+			(cs->mbus_attr << 8) |
+			(dram->mbus_dram_target_id << 4) | 1,
+				base + PCIE_WIN04_CTRL_OFF(i));
+
+		size += cs->size;
+	}
+
+	/*
+	 * Setup BAR[1] to all DRAM banks.
+	 */
+	writel(dram->cs[0].base, base + PCIE_BAR_LO_OFF(1));
+	writel(0, base + PCIE_BAR_HI_OFF(1));
+	writel(((size - 1) & 0xffff0000) | 1, base + PCIE_BAR_CTRL_OFF(1));
+}
+
+void __init orion_pcie_setup(void __iomem *base,
+			     struct mbus_dram_target_info *dram)
+{
+	u16 cmd;
+	u32 mask;
+
+	/*
+	 * Point PCIe unit MBUS decode windows to DRAM space.
+	 */
+	orion_pcie_setup_wins(base, dram);
+
+	/*
+	 * Master + slave enable.
+	 */
+	cmd = readw(base + PCIE_CMD_OFF);
+	cmd |= PCI_COMMAND_IO;
+	cmd |= PCI_COMMAND_MEMORY;
+	cmd |= PCI_COMMAND_MASTER;
+	writew(cmd, base + PCIE_CMD_OFF);
+
+	/*
+	 * Enable interrupt lines A-D.
+	 */
+	mask = readl(base + PCIE_MASK_OFF);
+	mask |= 0x0f000000;
+	writel(mask, base + PCIE_MASK_OFF);
+}
+
+int orion_pcie_rd_conf(void __iomem *base, struct pci_bus *bus,
+		       u32 devfn, int where, int size, u32 *val)
+{
+	writel(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,
+			base + PCIE_CONF_ADDR_OFF);
+
+	*val = readl(base + PCIE_CONF_DATA_OFF);
+
+	if (size == 1)
+		*val = (*val >> (8 * (where & 3))) & 0xff;
+	else if (size == 2)
+		*val = (*val >> (8 * (where & 3))) & 0xffff;
+
+	return PCIBIOS_SUCCESSFUL;
+}
+
+int orion_pcie_rd_conf_tlp(void __iomem *base, struct pci_bus *bus,
+			   u32 devfn, int where, int size, u32 *val)
+{
+	writel(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,
+			base + PCIE_CONF_ADDR_OFF);
+
+	*val = readl(base + PCIE_CONF_DATA_OFF);
+
+	if (bus->number != orion_pcie_get_local_bus_nr(base) ||
+	    PCI_FUNC(devfn) != 0)
+		*val = readl(base + PCIE_HEADER_LOG_4_OFF);
+
+	if (size == 1)
+		*val = (*val >> (8 * (where & 3))) & 0xff;
+	else if (size == 2)
+		*val = (*val >> (8 * (where & 3))) & 0xffff;
+
+	return PCIBIOS_SUCCESSFUL;
+}
+
+int orion_pcie_rd_conf_wa(void __iomem *wa_base, struct pci_bus *bus,
+			  u32 devfn, int where, int size, u32 *val)
+{
+	*val = readl(wa_base + (PCIE_CONF_BUS(bus->number) |
+				PCIE_CONF_DEV(PCI_SLOT(devfn)) |
+				PCIE_CONF_FUNC(PCI_FUNC(devfn)) |
+				PCIE_CONF_REG(where)));
+
+	if (size == 1)
+		*val = (*val >> (8 * (where & 3))) & 0xff;
+	else if (size == 2)
+		*val = (*val >> (8 * (where & 3))) & 0xffff;
+
+	return PCIBIOS_SUCCESSFUL;
+}
+
+int orion_pcie_wr_conf(void __iomem *base, struct pci_bus *bus,
+		       u32 devfn, int where, int size, u32 val)
+{
+	int ret = PCIBIOS_SUCCESSFUL;
+
+	writel(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,
+			base + PCIE_CONF_ADDR_OFF);
+
+	if (size == 4) {
+		writel(val, base + PCIE_CONF_DATA_OFF);
+	} else if (size == 2) {
+		writew(val, base + PCIE_CONF_DATA_OFF + (where & 3));
+	} else if (size == 1) {
+		writeb(val, base + PCIE_CONF_DATA_OFF + (where & 3));
+	} else {
+		ret = PCIBIOS_BAD_REGISTER_NUMBER;
+	}
+
+	return ret;
+}