+++ /dev/null
-/*
- * Moschip MCS8140 PCI support
- *
- * Copyright (C) 2003 Moschip Semiconductors Ltd.
- * Copyright (C) 2003 Artec Design Ltd.
- * Copyright (C) 2012 Florian Fainelli <florian@openwrt.org>
- *
- * 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/init.h>
-#include <linux/pci.h>
-#include <linux/ptrace.h>
-#include <linux/slab.h>
-#include <linux/ioport.h>
-#include <linux/interrupt.h>
-#include <linux/spinlock.h>
-#include <linux/init.h>
-#include <linux/platform_device.h>
-#include <linux/of.h>
-#include <linux/io.h>
-
-#include <asm/irq.h>
-#include <asm/system.h>
-#include <asm/mach/pci.h>
-#include <asm/mach/map.h>
-#include <mach/mcs814x.h>
-#include <mach/irqs.h>
-
-#define MCS8140_PCI_CONFIG_SIZE SZ_64M
-#define MCS8140_PCI_IOMISC_SIZE SZ_64M
-
-#define MCS8140_PCI_HOST_BASE 0x80000000
-#define MCS8140_PCI_IOMISC_BASE 0x00000000
-#define MCS8140_PCI_PRE_BASE 0x10000000
-#define MCS8140_PCI_NONPRE_BASE 0x30000000
-
-#define MCS8140_PCI_CFG_BASE (MCS8140_PCI_HOST_BASE + 0x04000000)
-#define MCS8140_PCI_IO_BASE (MCS8140_PCI_HOST_BASE)
-
-#define MCS8140_PCI_IO_VIRT_BASE (MCS814X_IO_BASE - MCS8140_PCI_CONFIG_SIZE - \
- MCS8140_PCI_IOMISC_SIZE)
-#define MCS8140_PCI_CFG_VIRT_BASE (MCS814X_IO_BASE - MCS8140_PCI_CONFIG_SIZE)
-
-#define PCI_FATAL_ERROR 1
-#define EXTERNAL_ABORT_NON_LINE_FETCH 8
-#define EPRM_DONE 0x80
-#define EPRM_SDRAM_FUNC0 0xAC
-#define PCI_INTD 4
-#define MCS8140_PCI_DEVICE_ID 0xA0009710
-#define MCS8140_PCI_CLASS_ID 0x02000011 /* Host-Class id :0x0600 */
-#define PCI_IF_CONFIG 0x200
-
-static void __iomem *mcs8140_pci_master_base;
-static void __iomem *mcs8140_eeprom_emu_base;
-
-static unsigned long __pci_addr(struct pci_bus *bus,
- unsigned int devfn, int offset)
-{
- unsigned int busnr = bus->number;
- unsigned int slot;
-
- /* we only support bus 0 */
- if (busnr != 0)
- return 0;
-
- /*
- * Trap out illegal values
- */
- BUG_ON(devfn > 255 || busnr > 255 || devfn > 255);
-
- /* Scan 3 slots */
- slot = PCI_SLOT(devfn);
- switch (slot) {
- case 1:
- case 2:
- case 3:
- if (PCI_FUNC(devfn) >= 4)
- return 0;
-
- return MCS8140_PCI_CFG_VIRT_BASE | (PCI_SLOT(devfn) << 11) |
- (PCI_FUNC(devfn) << 8) | offset;
- default:
- pr_warn("Ignoring: PCI Slot is %x\n", PCI_SLOT(devfn));
- return 0;
- }
-}
-
-static int mcs8140_pci_host_status(void)
-{
- u32 host_status;
-
- host_status = readl_relaxed(mcs8140_pci_master_base + PCI_IF_CONFIG);
- if (host_status & PCI_FATAL_ERROR) {
- writel_relaxed(host_status & 0xfffffff0,
- mcs8140_pci_master_base + PCI_IF_CONFIG);
- /* flush write */
- host_status =
- readl_relaxed(mcs8140_pci_master_base + PCI_IF_CONFIG);
- return 1;
- }
-
- return 0;
-}
-
-static int mcs8140_pci_read_config(struct pci_bus *bus,
- unsigned int devfn, int where,
- int size, u32 *val)
-{
- unsigned long v = 0xFFFFFFFF;
- unsigned long addr = __pci_addr(bus, devfn, where);
-
- if (addr != 0) {
- switch (size) {
- case 1:
- v = readb_relaxed(addr);
- break;
- case 2:
- addr &= ~1;
- v = readw_relaxed(addr);
- break;
- default:
- addr &= ~3;
- v = readl_relaxed(addr);
- break;
- }
- } else
- v = 0xffffffff;
-
- if (mcs8140_pci_host_status())
- v = 0xffffffff;
-
- *val = v;
-
- return PCIBIOS_SUCCESSFUL;
-}
-
-static void mcs8140_eeprom_emu_init(void)
-{
- writel_relaxed(0x0000000F, mcs8140_eeprom_emu_base + EPRM_SDRAM_FUNC0);
- writel_relaxed(0x08000000, MCS8140_PCI_CFG_VIRT_BASE + 0x10);
- /* Set the DONE bit of the EEPROM emulator */
- writel_relaxed(0x01, mcs8140_eeprom_emu_base + EPRM_DONE);
-}
-
-static int mcs8140_pci_write_config(struct pci_bus *bus,
- unsigned int devfn, int where,
- int size, u32 val)
-{
- unsigned long addr = __pci_addr(bus, devfn, where);
-
- if (addr != 0) {
- switch (size) {
- case 1:
- writeb_relaxed((u8)val, addr);
- break;
- case 2:
- writew_relaxed((u16)val, addr);
- break;
- case 4:
- writel_relaxed(val, addr);
- break;
- }
- }
-
- return PCIBIOS_SUCCESSFUL;
-}
-
-static struct pci_ops pci_mcs8140_ops = {
- .read = mcs8140_pci_read_config,
- .write = mcs8140_pci_write_config,
-};
-
-
-static struct resource io_mem = {
- .name = "PCI I/O space",
- .start = MCS8140_PCI_HOST_BASE + MCS8140_PCI_IOMISC_BASE,
- .end = MCS8140_PCI_HOST_BASE + MCS8140_PCI_IOMISC_BASE + SZ_64M,
- .flags = IORESOURCE_IO,
-};
-
-static struct resource pre_mem = {
- .name = "PCI prefetchable",
- .start = MCS8140_PCI_HOST_BASE + MCS8140_PCI_PRE_BASE,
- .end = MCS8140_PCI_HOST_BASE + MCS8140_PCI_PRE_BASE + SZ_512M,
- .flags = IORESOURCE_MEM | IORESOURCE_PREFETCH,
-};
-
-static struct resource non_mem = {
- .name = "PCI non-prefetchable",
- .start = MCS8140_PCI_HOST_BASE + MCS8140_PCI_NONPRE_BASE,
- .end = MCS8140_PCI_HOST_BASE + MCS8140_PCI_NONPRE_BASE + SZ_256M,
- .flags = IORESOURCE_MEM,
-};
-
-int __init pci_mcs8140_setup_resources(struct pci_sys_data *sys)
-{
- int ret = 0;
-
- ret = request_resource(&iomem_resource, &io_mem);
- if (ret) {
- pr_err("PCI: unable to allocate I/O "
- "memory region (%d)\n", ret);
- goto out;
- }
-
- ret = request_resource(&iomem_resource, &non_mem);
- if (ret) {
- pr_err("PCI: unable to allocate non-prefetchable "
- "memory region (%d)\n", ret);
- goto release_io_mem;
- }
-
- ret = request_resource(&iomem_resource, &pre_mem);
- if (ret) {
- pr_err("PCI: unable to allocate prefetchable "
- "memory region (%d)\n", ret);
- goto release_non_mem;
- }
-
- mcs8140_eeprom_emu_init();
-
- pci_add_resource(&sys->resources, &io_mem);
- pci_add_resource(&sys->resources, &non_mem);
- pci_add_resource(&sys->resources, &pre_mem);
-
- return ret;
-
-release_non_mem:
- release_resource(&non_mem);
-release_io_mem:
- release_resource(&io_mem);
-out:
- return ret;
-}
-
-struct pci_bus *pci_mcs8140_scan_bus(int nr, struct pci_sys_data *sys)
-{
- return pci_scan_bus(sys->busnr, &pci_mcs8140_ops, sys);
-}
-
-
-int __init pci_mcs8140_setup(int nr, struct pci_sys_data *sys)
-{
- int ret = 0;
- u32 val;
-
- if (nr > 0)
- return 0;
-
- sys->mem_offset = MCS8140_PCI_IO_VIRT_BASE - MCS8140_PCI_IO_BASE;
- sys->io_offset = 0;
-
- ret = pci_mcs8140_setup_resources(sys);
- if (ret < 0) {
- pr_err("unable to setup mcs8140 resources\n");
- goto out;
- }
-
- val = readl_relaxed(MCS8140_PCI_CFG_VIRT_BASE);
- if (val != MCS8140_PCI_DEVICE_ID) {
- pr_err("cannot find MCS8140 PCI Core: %08x\n", val);
- ret = -EIO;
- goto out;
- }
-
- pr_info("MCS8140 PCI core found\n");
-
- val = readl_relaxed(MCS8140_PCI_CFG_VIRT_BASE + PCI_COMMAND);
- /* Added to support wireless cards */
- writel_relaxed(0, MCS8140_PCI_CFG_VIRT_BASE + 0x40);
- writel_relaxed(val | 0x147, MCS8140_PCI_CFG_VIRT_BASE + PCI_COMMAND);
- val = readl_relaxed(MCS8140_PCI_CFG_VIRT_BASE + PCI_COMMAND);
- ret = 1;
-out:
- return ret;
-}
-
-
-static int __init mcs8140_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
-{
- int line = IRQ_PCI_INTA;
-
- if (pin != 0) {
- /* IRQ_PCIA - 22 */
- if (pin == PCI_INTD)
- line = IRQ_PCI_INTA + pin; /* IRQ_PCIA - 22 */
- else
- line = IRQ_PCI_INTA + pin - 1; /* IRQ_PCIA - 22 */
- }
-
- pr_info("PCI: Map interrupt slot 0x%02x pin 0x%02x line 0x%02x\n",
- slot, pin, line);
-
- return line;
-}
-
-static irqreturn_t mcs8140_pci_abort_interrupt(int irq, void *dummy)
-{
- u32 word;
-
- word = readl_relaxed(mcs8140_pci_master_base + PCI_IF_CONFIG);
- if (!(word & (1 << 24)))
- return IRQ_NONE;
-
- writel_relaxed(word & 0xfffffff0,
- mcs8140_pci_master_base + PCI_IF_CONFIG);
- /* flush write */
- word = readl_relaxed(mcs8140_pci_master_base + PCI_IF_CONFIG);
-
- return IRQ_HANDLED;
-}
-
-static int mcs8140_pci_abort_irq_init(int irq)
-{
- u32 word;
-
- /* Enable Interrupt in PCI Master Core */
- word = readl_relaxed(mcs8140_pci_master_base + PCI_IF_CONFIG);
- word |= (1 << 24);
- writel_relaxed(word, mcs8140_pci_master_base + PCI_IF_CONFIG);
-
- /* flush write */
- word = readl_relaxed(mcs8140_pci_master_base + PCI_IF_CONFIG);
-
- return request_irq(irq, mcs8140_pci_abort_interrupt, 0,
- "PCI abort", NULL);
-}
-
-static int mcs8140_pci_host_abort(unsigned long addr,
- unsigned int fsr, struct pt_regs *regs)
-{
- pr_warn("PCI Data 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) || mcs8140_pci_host_status())
- regs->ARM_pc += 4;
-
- return 0;
-}
-
-static void mcs8140_data_abort_init(void)
-{
- hook_fault_code(EXTERNAL_ABORT_NON_LINE_FETCH,
- mcs8140_pci_host_abort, SIGBUS,
- 0, "external abort on non-line fetch");
-}
-
-static struct hw_pci mcs8140_pci __initdata = {
- .map_irq = mcs8140_map_irq,
- .nr_controllers = 1,
- .setup = pci_mcs8140_setup,
- .scan = pci_mcs8140_scan_bus,
-};
-
-static struct map_desc mcs8140_pci_io_desc[] __initdata = {
- {
- .virtual = MCS8140_PCI_CFG_VIRT_BASE,
- .pfn = __phys_to_pfn(MCS8140_PCI_CFG_BASE),
- .length = MCS8140_PCI_CONFIG_SIZE,
- .type = MT_DEVICE
- },
- {
- .virtual = MCS8140_PCI_IO_VIRT_BASE,
- .pfn = __phys_to_pfn(MCS8140_PCI_IO_BASE),
- .length = MCS8140_PCI_IOMISC_SIZE,
- .type = MT_DEVICE
- },
-};
-
-static int __devinit mcs8140_pci_probe(struct platform_device *pdev)
-{
- struct resource *res;
- int ret, irq;
-
- res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- if (!res) {
- dev_err(&pdev->dev, "failed to get mem resource 0\n");
- return -ENODEV;
- }
-
- mcs8140_pci_master_base = devm_ioremap(&pdev->dev, res->start,
- resource_size(res));
- if (!mcs8140_pci_master_base) {
- dev_err(&pdev->dev, "failed to remap PCI master regs\n");
- return -ENODEV;
- }
-
- res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
- if (!res) {
- dev_err(&pdev->dev, "failed to get mem resource 1\n");
- return -ENOMEM;
- }
-
- mcs8140_eeprom_emu_base = devm_ioremap(&pdev->dev, res->start,
- resource_size(res));
- if (!mcs8140_eeprom_emu_base) {
- dev_err(&pdev->dev, "failed to remap EEPROM regs\n");
- return -ENOMEM;
- }
-
- irq = platform_get_irq(pdev, 0);
- if (irq < 0) {
- dev_err(&pdev->dev, "failed to get pci abort irq\n");
- return -ENODEV;
- }
-
- /* Setup static mappins for PCI CFG space */
- iotable_init(mcs8140_pci_io_desc, ARRAY_SIZE(mcs8140_pci_io_desc));
-
- pcibios_min_io = MCS8140_PCI_HOST_BASE;
- pcibios_min_mem = MCS8140_PCI_HOST_BASE + MCS8140_PCI_PRE_BASE;
-
- mcs8140_data_abort_init();
- ret = mcs8140_pci_abort_irq_init(irq);
- if (ret) {
- dev_err(&pdev->dev, "failed to setup abort irq\n");
- return ret;
- }
-
- pci_common_init(&mcs8140_pci);
-
- return 0;
-}
-
-static struct of_device_id mcs8140_of_ids[] __devinitdata = {
- { .compatible = "moschip,mcs8140-pci" },
- { .compatible = "moschip,mcs814x-pci" },
- { /* sentinel */ },
-};
-
-static struct platform_driver mcs8140_pci_driver = {
- .driver = {
- .name = "mcs8140-pci",
- .of_match_table = mcs8140_of_ids,
- },
- .probe = mcs8140_pci_probe,
-};
-
-static int __init mcs8140_pci_init(void)
-{
- return platform_driver_register(&mcs8140_pci_driver);
-}
-subsys_initcall(mcs8140_pci_init);
-
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