aboutsummaryrefslogtreecommitdiffstats
path: root/arch/arm/mach-ixp4xx/common-pci.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/arm/mach-ixp4xx/common-pci.c')
-rw-r--r--arch/arm/mach-ixp4xx/common-pci.c451
1 files changed, 0 insertions, 451 deletions
diff --git a/arch/arm/mach-ixp4xx/common-pci.c b/arch/arm/mach-ixp4xx/common-pci.c
deleted file mode 100644
index 893c19c254e3..000000000000
--- a/arch/arm/mach-ixp4xx/common-pci.c
+++ /dev/null
@@ -1,451 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * arch/arm/mach-ixp4xx/common-pci.c
- *
- * IXP4XX PCI routines for all platforms
- *
- * Maintainer: Deepak Saxena <dsaxena@plexity.net>
- *
- * Copyright (C) 2002 Intel Corporation.
- * Copyright (C) 2003 Greg Ungerer <gerg@snapgear.com>
- * Copyright (C) 2003-2004 MontaVista Software, Inc.
- */
-
-#include <linux/sched.h>
-#include <linux/kernel.h>
-#include <linux/pci.h>
-#include <linux/interrupt.h>
-#include <linux/mm.h>
-#include <linux/init.h>
-#include <linux/ioport.h>
-#include <linux/slab.h>
-#include <linux/delay.h>
-#include <linux/device.h>
-#include <linux/io.h>
-#include <linux/export.h>
-#include <asm/dma-mapping.h>
-
-#include <asm/cputype.h>
-#include <asm/irq.h>
-#include <linux/sizes.h>
-#include <asm/mach/pci.h>
-#include <mach/hardware.h>
-
-
-/*
- * IXP4xx PCI read function is dependent on whether we are
- * running A0 or B0 (AppleGate) silicon.
- */
-int (*ixp4xx_pci_read)(u32 addr, u32 cmd, u32* data);
-
-/*
- * Base address for PCI register region
- */
-unsigned long ixp4xx_pci_reg_base = 0;
-
-/*
- * PCI cfg an I/O routines are done by programming a
- * command/byte enable register, and then read/writing
- * the data from a data register. We need to ensure
- * these transactions are atomic or we will end up
- * with corrupt data on the bus or in a driver.
- */
-static DEFINE_RAW_SPINLOCK(ixp4xx_pci_lock);
-
-/*
- * Read from PCI config space
- */
-static void crp_read(u32 ad_cbe, u32 *data)
-{
- unsigned long flags;
- raw_spin_lock_irqsave(&ixp4xx_pci_lock, flags);
- *PCI_CRP_AD_CBE = ad_cbe;
- *data = *PCI_CRP_RDATA;
- raw_spin_unlock_irqrestore(&ixp4xx_pci_lock, flags);
-}
-
-/*
- * Write to PCI config space
- */
-static void crp_write(u32 ad_cbe, u32 data)
-{
- unsigned long flags;
- raw_spin_lock_irqsave(&ixp4xx_pci_lock, flags);
- *PCI_CRP_AD_CBE = CRP_AD_CBE_WRITE | ad_cbe;
- *PCI_CRP_WDATA = data;
- raw_spin_unlock_irqrestore(&ixp4xx_pci_lock, flags);
-}
-
-static inline int check_master_abort(void)
-{
- /* check Master Abort bit after access */
- unsigned long isr = *PCI_ISR;
-
- if (isr & PCI_ISR_PFE) {
- /* make sure the Master Abort bit is reset */
- *PCI_ISR = PCI_ISR_PFE;
- pr_debug("%s failed\n", __func__);
- return 1;
- }
-
- return 0;
-}
-
-int ixp4xx_pci_read_errata(u32 addr, u32 cmd, u32* data)
-{
- unsigned long flags;
- int retval = 0;
- int i;
-
- raw_spin_lock_irqsave(&ixp4xx_pci_lock, flags);
-
- *PCI_NP_AD = addr;
-
- /*
- * PCI workaround - only works if NP PCI space reads have
- * no side effects!!! Read 8 times. last one will be good.
- */
- for (i = 0; i < 8; i++) {
- *PCI_NP_CBE = cmd;
- *data = *PCI_NP_RDATA;
- *data = *PCI_NP_RDATA;
- }
-
- if(check_master_abort())
- retval = 1;
-
- raw_spin_unlock_irqrestore(&ixp4xx_pci_lock, flags);
- return retval;
-}
-
-int ixp4xx_pci_read_no_errata(u32 addr, u32 cmd, u32* data)
-{
- unsigned long flags;
- int retval = 0;
-
- raw_spin_lock_irqsave(&ixp4xx_pci_lock, flags);
-
- *PCI_NP_AD = addr;
-
- /* set up and execute the read */
- *PCI_NP_CBE = cmd;
-
- /* the result of the read is now in NP_RDATA */
- *data = *PCI_NP_RDATA;
-
- if(check_master_abort())
- retval = 1;
-
- raw_spin_unlock_irqrestore(&ixp4xx_pci_lock, flags);
- return retval;
-}
-
-int ixp4xx_pci_write(u32 addr, u32 cmd, u32 data)
-{
- unsigned long flags;
- int retval = 0;
-
- raw_spin_lock_irqsave(&ixp4xx_pci_lock, flags);
-
- *PCI_NP_AD = addr;
-
- /* set up the write */
- *PCI_NP_CBE = cmd;
-
- /* execute the write by writing to NP_WDATA */
- *PCI_NP_WDATA = data;
-
- if(check_master_abort())
- retval = 1;
-
- raw_spin_unlock_irqrestore(&ixp4xx_pci_lock, flags);
- return retval;
-}
-
-static u32 ixp4xx_config_addr(u8 bus_num, u16 devfn, int where)
-{
- u32 addr;
- if (!bus_num) {
- /* type 0 */
- addr = BIT(32-PCI_SLOT(devfn)) | ((PCI_FUNC(devfn)) << 8) |
- (where & ~3);
- } else {
- /* type 1 */
- addr = (bus_num << 16) | ((PCI_SLOT(devfn)) << 11) |
- ((PCI_FUNC(devfn)) << 8) | (where & ~3) | 1;
- }
- return addr;
-}
-
-/*
- * Mask table, bits to mask for quantity of size 1, 2 or 4 bytes.
- * 0 and 3 are not valid indexes...
- */
-static u32 bytemask[] = {
- /*0*/ 0,
- /*1*/ 0xff,
- /*2*/ 0xffff,
- /*3*/ 0,
- /*4*/ 0xffffffff,
-};
-
-static u32 local_byte_lane_enable_bits(u32 n, int size)
-{
- if (size == 1)
- return (0xf & ~BIT(n)) << CRP_AD_CBE_BESL;
- if (size == 2)
- return (0xf & ~(BIT(n) | BIT(n+1))) << CRP_AD_CBE_BESL;
- if (size == 4)
- return 0;
- return 0xffffffff;
-}
-
-static int local_read_config(int where, int size, u32 *value)
-{
- u32 n, data;
- pr_debug("local_read_config from %d size %d\n", where, size);
- n = where % 4;
- crp_read(where & ~3, &data);
- *value = (data >> (8*n)) & bytemask[size];
- pr_debug("local_read_config read %#x\n", *value);
- return PCIBIOS_SUCCESSFUL;
-}
-
-static int local_write_config(int where, int size, u32 value)
-{
- u32 n, byte_enables, data;
- pr_debug("local_write_config %#x to %d size %d\n", value, where, size);
- n = where % 4;
- byte_enables = local_byte_lane_enable_bits(n, size);
- if (byte_enables == 0xffffffff)
- return PCIBIOS_BAD_REGISTER_NUMBER;
- data = value << (8*n);
- crp_write((where & ~3) | byte_enables, data);
- return PCIBIOS_SUCCESSFUL;
-}
-
-static u32 byte_lane_enable_bits(u32 n, int size)
-{
- if (size == 1)
- return (0xf & ~BIT(n)) << 4;
- if (size == 2)
- return (0xf & ~(BIT(n) | BIT(n+1))) << 4;
- if (size == 4)
- return 0;
- return 0xffffffff;
-}
-
-static int ixp4xx_pci_read_config(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 *value)
-{
- u32 n, byte_enables, addr, data;
- u8 bus_num = bus->number;
-
- pr_debug("read_config from %d size %d dev %d:%d:%d\n", where, size,
- bus_num, PCI_SLOT(devfn), PCI_FUNC(devfn));
-
- *value = 0xffffffff;
- n = where % 4;
- byte_enables = byte_lane_enable_bits(n, size);
- if (byte_enables == 0xffffffff)
- return PCIBIOS_BAD_REGISTER_NUMBER;
-
- addr = ixp4xx_config_addr(bus_num, devfn, where);
- if (ixp4xx_pci_read(addr, byte_enables | NP_CMD_CONFIGREAD, &data))
- return PCIBIOS_DEVICE_NOT_FOUND;
-
- *value = (data >> (8*n)) & bytemask[size];
- pr_debug("read_config_byte read %#x\n", *value);
- return PCIBIOS_SUCCESSFUL;
-}
-
-static int ixp4xx_pci_write_config(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 value)
-{
- u32 n, byte_enables, addr, data;
- u8 bus_num = bus->number;
-
- pr_debug("write_config_byte %#x to %d size %d dev %d:%d:%d\n", value, where,
- size, bus_num, PCI_SLOT(devfn), PCI_FUNC(devfn));
-
- n = where % 4;
- byte_enables = byte_lane_enable_bits(n, size);
- if (byte_enables == 0xffffffff)
- return PCIBIOS_BAD_REGISTER_NUMBER;
-
- addr = ixp4xx_config_addr(bus_num, devfn, where);
- data = value << (8*n);
- if (ixp4xx_pci_write(addr, byte_enables | NP_CMD_CONFIGWRITE, data))
- return PCIBIOS_DEVICE_NOT_FOUND;
-
- return PCIBIOS_SUCCESSFUL;
-}
-
-struct pci_ops ixp4xx_ops = {
- .read = ixp4xx_pci_read_config,
- .write = ixp4xx_pci_write_config,
-};
-
-/*
- * PCI abort handler
- */
-static int abort_handler(unsigned long addr, unsigned int fsr, struct pt_regs *regs)
-{
- u32 isr, status;
-
- isr = *PCI_ISR;
- local_read_config(PCI_STATUS, 2, &status);
- pr_debug("PCI: abort_handler addr = %#lx, isr = %#x, "
- "status = %#x\n", addr, isr, status);
-
- /* make sure the Master Abort bit is reset */
- *PCI_ISR = PCI_ISR_PFE;
- status |= PCI_STATUS_REC_MASTER_ABORT;
- local_write_config(PCI_STATUS, 2, status);
-
- /*
- * 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;
-}
-
-void __init ixp4xx_pci_preinit(void)
-{
- unsigned long cpuid = read_cpuid_id();
-
-#ifdef CONFIG_IXP4XX_INDIRECT_PCI
- pcibios_min_mem = 0x10000000; /* 1 GB of indirect PCI MMIO space */
-#else
- pcibios_min_mem = 0x48000000; /* 64 MB of PCI MMIO space */
-#endif
- /*
- * Determine which PCI read method to use.
- * Rev 0 IXP425 requires workaround.
- */
- if (!(cpuid & 0xf) && cpu_is_ixp42x()) {
- printk("PCI: IXP42x A0 silicon detected - "
- "PCI Non-Prefetch Workaround Enabled\n");
- ixp4xx_pci_read = ixp4xx_pci_read_errata;
- } else
- ixp4xx_pci_read = ixp4xx_pci_read_no_errata;
-
-
- /* hook in our fault handler for PCI errors */
- hook_fault_code(16+6, abort_handler, SIGBUS, 0,
- "imprecise external abort");
-
- pr_debug("setup PCI-AHB(inbound) and AHB-PCI(outbound) address mappings\n");
-
- /*
- * We use identity AHB->PCI address translation
- * in the 0x48000000 to 0x4bffffff address space
- */
- *PCI_PCIMEMBASE = 0x48494A4B;
-
- /*
- * We also use identity PCI->AHB address translation
- * in 4 16MB BARs that begin at the physical memory start
- */
- *PCI_AHBMEMBASE = (PHYS_OFFSET & 0xFF000000) +
- ((PHYS_OFFSET & 0xFF000000) >> 8) +
- ((PHYS_OFFSET & 0xFF000000) >> 16) +
- ((PHYS_OFFSET & 0xFF000000) >> 24) +
- 0x00010203;
-
- if (*PCI_CSR & PCI_CSR_HOST) {
- printk("PCI: IXP4xx is host\n");
-
- pr_debug("setup BARs in controller\n");
-
- /*
- * We configure the PCI inbound memory windows to be
- * 1:1 mapped to SDRAM
- */
- local_write_config(PCI_BASE_ADDRESS_0, 4, PHYS_OFFSET);
- local_write_config(PCI_BASE_ADDRESS_1, 4, PHYS_OFFSET + SZ_16M);
- local_write_config(PCI_BASE_ADDRESS_2, 4, PHYS_OFFSET + SZ_32M);
- local_write_config(PCI_BASE_ADDRESS_3, 4,
- PHYS_OFFSET + SZ_32M + SZ_16M);
-
- /*
- * Enable CSR window at 64 MiB to allow PCI masters
- * to continue prefetching past 64 MiB boundary.
- */
- local_write_config(PCI_BASE_ADDRESS_4, 4, PHYS_OFFSET + SZ_64M);
-
- /*
- * Enable the IO window to be way up high, at 0xfffffc00
- */
- local_write_config(PCI_BASE_ADDRESS_5, 4, 0xfffffc01);
- local_write_config(0x40, 4, 0x000080FF); /* No TRDY time limit */
- } else {
- printk("PCI: IXP4xx is target - No bus scan performed\n");
- }
-
- printk("PCI: IXP4xx Using %s access for memory space\n",
-#ifndef CONFIG_IXP4XX_INDIRECT_PCI
- "direct"
-#else
- "indirect"
-#endif
- );
-
- pr_debug("clear error bits in ISR\n");
- *PCI_ISR = PCI_ISR_PSE | PCI_ISR_PFE | PCI_ISR_PPE | PCI_ISR_AHBE;
-
- /*
- * Set Initialize Complete in PCI Control Register: allow IXP4XX to
- * respond to PCI configuration cycles. Specify that the AHB bus is
- * operating in big endian mode. Set up byte lane swapping between
- * little-endian PCI and the big-endian AHB bus
- */
-#ifdef __ARMEB__
- *PCI_CSR = PCI_CSR_IC | PCI_CSR_ABE | PCI_CSR_PDS | PCI_CSR_ADS;
-#else
- *PCI_CSR = PCI_CSR_IC | PCI_CSR_ABE;
-#endif
-
- pr_debug("DONE\n");
-}
-
-int ixp4xx_setup(int nr, struct pci_sys_data *sys)
-{
- struct resource *res;
-
- if (nr >= 1)
- return 0;
-
- res = kcalloc(2, sizeof(*res), GFP_KERNEL);
- if (res == NULL) {
- /*
- * If we're out of memory this early, something is wrong,
- * so we might as well catch it here.
- */
- panic("PCI: unable to allocate resources?\n");
- }
-
- local_write_config(PCI_COMMAND, 2, PCI_COMMAND_MASTER | PCI_COMMAND_MEMORY);
-
- res[0].name = "PCI I/O Space";
- res[0].start = 0x00000000;
- res[0].end = 0x0000ffff;
- res[0].flags = IORESOURCE_IO;
-
- res[1].name = "PCI Memory Space";
- res[1].start = PCIBIOS_MIN_MEM;
- res[1].end = PCIBIOS_MAX_MEM;
- res[1].flags = IORESOURCE_MEM;
-
- request_resource(&ioport_resource, &res[0]);
- request_resource(&iomem_resource, &res[1]);
-
- pci_add_resource_offset(&sys->resources, &res[0], sys->io_offset);
- pci_add_resource_offset(&sys->resources, &res[1], sys->mem_offset);
-
- return 1;
-}
-
-EXPORT_SYMBOL(ixp4xx_pci_read);
-EXPORT_SYMBOL(ixp4xx_pci_write);
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.