[ARM] 3820/1: iop3xx: factor out shared pci code

Merge the iop32x PCI code and iop33x PCI code into plat-iop/pci.c.

Signed-off-by: Lennert Buytenhek <buytenh@wantstofly.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 247 insertions, 0 deletions

diff --git a/arch/arm/plat-iop/pci.c b/arch/arm/plat-iop/pci.c
new file mode 100644
index 000000000000..e647812654f2
--- /dev/null
+++ b/arch/arm/plat-iop/pci.c
@@ -0,0 +1,247 @@
+/*
+ * arch/arm/plat-iop/pci.c
+ *
+ * PCI support for the Intel IOP32X and IOP33X processors
+ *
+ * Author: Rory Bolt <rorybolt@pacbell.net>
+ * Copyright (C) 2002 Rory Bolt
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/kernel.h>
+#include <linux/pci.h>
+#include <linux/slab.h>
+#include <linux/mm.h>
+#include <linux/init.h>
+#include <linux/ioport.h>
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/system.h>
+#include <asm/hardware.h>
+#include <asm/mach/pci.h>
+#include <asm/hardware/iop3xx.h>
+
+// #define DEBUG
+
+#ifdef DEBUG
+#define  DBG(x...) printk(x)
+#else
+#define  DBG(x...) do { } while (0)
+#endif
+
+/*
+ * This routine builds either a type0 or type1 configuration command.  If the
+ * bus is on the 803xx then a type0 made, else a type1 is created.
+ */
+static u32 iop3xx_cfg_address(struct pci_bus *bus, int devfn, int where)
+{
+	struct pci_sys_data *sys = bus->sysdata;
+	u32 addr;
+
+	if (sys->busnr == bus->number)
+		addr = 1 << (PCI_SLOT(devfn) + 16) | (PCI_SLOT(devfn) << 11);
+	else
+		addr = bus->number << 16 | PCI_SLOT(devfn) << 11 | 1;
+
+	addr |=	PCI_FUNC(devfn) << 8 | (where & ~3);
+
+	return addr;
+}
+
+/*
+ * This routine checks the status of the last configuration cycle.  If an error
+ * was detected it returns a 1, else it returns a 0.  The errors being checked
+ * are parity, master abort, target abort (master and target).  These types of
+ * errors occure during a config cycle where there is no device, like during
+ * the discovery stage.
+ */
+static int iop3xx_pci_status(void)
+{
+	unsigned int status;
+	int ret = 0;
+
+	/*
+	 * Check the status registers.
+	 */
+	status = *IOP3XX_ATUSR;
+	if (status & 0xf900) {
+		DBG("\t\t\tPCI: P0 - status = 0x%08x\n", status);
+		*IOP3XX_ATUSR = status & 0xf900;
+		ret = 1;
+	}
+
+	status = *IOP3XX_ATUISR;
+	if (status & 0x679f) {
+		DBG("\t\t\tPCI: P1 - status = 0x%08x\n", status);
+		*IOP3XX_ATUISR = status & 0x679f;
+		ret = 1;
+	}
+
+	return ret;
+}
+
+/*
+ * Simply write the address register and read the configuration
+ * data.  Note that the 4 nop's ensure that we are able to handle
+ * a delayed abort (in theory.)
+ */
+static inline u32 iop3xx_read(unsigned long addr)
+{
+	u32 val;
+
+	__asm__ __volatile__(
+		"str	%1, [%2]\n\t"
+		"ldr	%0, [%3]\n\t"
+		"nop\n\t"
+		"nop\n\t"
+		"nop\n\t"
+		"nop\n\t"
+		: "=r" (val)
+		: "r" (addr), "r" (IOP3XX_OCCAR), "r" (IOP3XX_OCCDR));
+
+	return val;
+}
+
+/*
+ * The read routines must check the error status of the last configuration
+ * cycle.  If there was an error, the routine returns all hex f's.
+ */
+static int
+iop3xx_read_config(struct pci_bus *bus, unsigned int devfn, int where,
+		int size, u32 *value)
+{
+	unsigned long addr = iop3xx_cfg_address(bus, devfn, where);
+	u32 val = iop3xx_read(addr) >> ((where & 3) * 8);
+
+	if (iop3xx_pci_status())
+		val = 0xffffffff;
+
+	*value = val;
+
+	return PCIBIOS_SUCCESSFUL;
+}
+
+static int
+iop3xx_write_config(struct pci_bus *bus, unsigned int devfn, int where,
+		int size, u32 value)
+{
+	unsigned long addr = iop3xx_cfg_address(bus, devfn, where);
+	u32 val;
+
+	if (size != 4) {
+		val = iop3xx_read(addr);
+		if (iop3xx_pci_status())
+			return PCIBIOS_SUCCESSFUL;
+
+		where = (where & 3) * 8;
+
+		if (size == 1)
+			val &= ~(0xff << where);
+		else
+			val &= ~(0xffff << where);
+
+		*IOP3XX_OCCDR = val | value << where;
+	} else {
+		asm volatile(
+			"str	%1, [%2]\n\t"
+			"str	%0, [%3]\n\t"
+			"nop\n\t"
+			"nop\n\t"
+			"nop\n\t"
+			"nop\n\t"
+			:
+			: "r" (value), "r" (addr),
+			  "r" (IOP3XX_OCCAR), "r" (IOP3XX_OCCDR));
+	}
+
+	return PCIBIOS_SUCCESSFUL;
+}
+
+static struct pci_ops iop3xx_ops = {
+	.read	= iop3xx_read_config,
+	.write	= iop3xx_write_config,
+};
+
+/*
+ * When a PCI device does not exist during config cycles, the 80200 gets a
+ * bus error instead of returning 0xffffffff. This handler simply returns.
+ */
+static int
+iop3xx_pci_abort(unsigned long addr, unsigned int fsr, struct pt_regs *regs)
+{
+	DBG("PCI abort: address = 0x%08lx fsr = 0x%03x PC = 0x%08lx LR = 0x%08lx\n",
+		addr, fsr, regs->ARM_pc, regs->ARM_lr);
+
+	/*
+	 * If it was an imprecise abort, then we need to correct the
+	 * return address to be _after_ the instruction.
+	 */
+	if (fsr & (1 << 10))
+		regs->ARM_pc += 4;
+
+	return 0;
+}
+
+int iop3xx_pci_setup(int nr, struct pci_sys_data *sys)
+{
+	struct resource *res;
+
+	if (nr != 0)
+		return 0;
+
+	res = kzalloc(2 * sizeof(struct resource), GFP_KERNEL);
+	if (!res)
+		panic("PCI: unable to alloc resources");
+
+	res[0].start = IOP3XX_PCI_LOWER_IO_VA;
+	res[0].end   = IOP3XX_PCI_LOWER_IO_VA + IOP3XX_PCI_IO_WINDOW_SIZE - 1;
+	res[0].name  = "IOP3XX PCI I/O Space";
+	res[0].flags = IORESOURCE_IO;
+	request_resource(&ioport_resource, &res[0]);
+
+	res[1].start = IOP3XX_PCI_LOWER_MEM_PA;
+	res[1].end   = IOP3XX_PCI_LOWER_MEM_PA + IOP3XX_PCI_MEM_WINDOW_SIZE - 1;
+	res[1].name  = "IOP3XX PCI Memory Space";
+	res[1].flags = IORESOURCE_MEM;
+	request_resource(&iomem_resource, &res[1]);
+
+	sys->mem_offset = IOP3XX_PCI_LOWER_MEM_PA - IOP3XX_PCI_LOWER_MEM_BA;
+	sys->io_offset  = IOP3XX_PCI_LOWER_IO_VA - IOP3XX_PCI_LOWER_IO_BA;
+
+	sys->resource[0] = &res[0];
+	sys->resource[1] = &res[1];
+	sys->resource[2] = NULL;
+
+	return 1;
+}
+
+struct pci_bus *iop3xx_pci_scan_bus(int nr, struct pci_sys_data *sys)
+{
+	return pci_scan_bus(sys->busnr, &iop3xx_ops, sys);
+}
+
+void iop3xx_pci_preinit(void)
+{
+	DBG("PCI:  Intel 803xx PCI init code.\n");
+	DBG("ATU: IOP3XX_ATUCMD=0x%04x\n", *IOP3XX_ATUCMD);
+	DBG("ATU: IOP3XX_OMWTVR0=0x%04x, IOP3XX_OIOWTVR=0x%04x\n",
+			*IOP3XX_OMWTVR0,
+			*IOP3XX_OIOWTVR);
+	DBG("ATU: IOP3XX_ATUCR=0x%08x\n", *IOP3XX_ATUCR);
+	DBG("ATU: IOP3XX_IABAR0=0x%08x IOP3XX_IALR0=0x%08x IOP3XX_IATVR0=%08x\n",
+			*IOP3XX_IABAR0, *IOP3XX_IALR0, *IOP3XX_IATVR0);
+	DBG("ATU: IOP3XX_OMWTVR0=0x%08x\n", *IOP3XX_OMWTVR0);
+	DBG("ATU: IOP3XX_IABAR1=0x%08x IOP3XX_IALR1=0x%08x\n",
+			*IOP3XX_IABAR1, *IOP3XX_IALR1);
+	DBG("ATU: IOP3XX_ERBAR=0x%08x IOP3XX_ERLR=0x%08x IOP3XX_ERTVR=%08x\n",
+			*IOP3XX_ERBAR, *IOP3XX_ERLR, *IOP3XX_ERTVR);
+	DBG("ATU: IOP3XX_IABAR2=0x%08x IOP3XX_IALR2=0x%08x IOP3XX_IATVR2=%08x\n",
+			*IOP3XX_IABAR2, *IOP3XX_IALR2, *IOP3XX_IATVR2);
+	DBG("ATU: IOP3XX_IABAR3=0x%08x IOP3XX_IALR3=0x%08x IOP3XX_IATVR3=%08x\n",
+			*IOP3XX_IABAR3, *IOP3XX_IALR3, *IOP3XX_IATVR3);
+
+	hook_fault_code(16+6, iop3xx_pci_abort, SIGBUS, "imprecise external abort");
+}