![Paul Bolle](/assets/img/avatar_default.png)
Commit 7517de3486
("MIPS: Alchemy: Redo
PCI as platform driver") added a reference to CONFIG_DEBUG_PCI. Change
it to CONFIG_PCI_DEBUG, as that is a valid Kconfig macro.
Also add a newline to a debugging printk that this fix enables.
Signed-off-by: Paul Bolle <pebolle@tiscali.nl>
Cc: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
516 lines
14 KiB
C
516 lines
14 KiB
C
/*
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* Alchemy PCI host mode support.
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*
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* Copyright 2001-2003, 2007-2008 MontaVista Software Inc.
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* Author: MontaVista Software, Inc. <source@mvista.com>
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*
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* Support for all devices (greater than 16) added by David Gathright.
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*/
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#include <linux/export.h>
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#include <linux/types.h>
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#include <linux/pci.h>
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#include <linux/platform_device.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/syscore_ops.h>
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#include <linux/vmalloc.h>
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#include <asm/mach-au1x00/au1000.h>
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#include <asm/tlbmisc.h>
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#ifdef CONFIG_PCI_DEBUG
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#define DBG(x...) printk(KERN_DEBUG x)
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#else
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#define DBG(x...) do {} while (0)
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#endif
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#define PCI_ACCESS_READ 0
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#define PCI_ACCESS_WRITE 1
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struct alchemy_pci_context {
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struct pci_controller alchemy_pci_ctrl; /* leave as first member! */
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void __iomem *regs; /* ctrl base */
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/* tools for wired entry for config space access */
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unsigned long last_elo0;
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unsigned long last_elo1;
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int wired_entry;
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struct vm_struct *pci_cfg_vm;
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unsigned long pm[12];
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int (*board_map_irq)(const struct pci_dev *d, u8 slot, u8 pin);
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int (*board_pci_idsel)(unsigned int devsel, int assert);
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};
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/* for syscore_ops. There's only one PCI controller on Alchemy chips, so this
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* should suffice for now.
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*/
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static struct alchemy_pci_context *__alchemy_pci_ctx;
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/* IO/MEM resources for PCI. Keep the memres in sync with __fixup_bigphys_addr
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* in arch/mips/alchemy/common/setup.c
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*/
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static struct resource alchemy_pci_def_memres = {
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.start = ALCHEMY_PCI_MEMWIN_START,
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.end = ALCHEMY_PCI_MEMWIN_END,
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.name = "PCI memory space",
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.flags = IORESOURCE_MEM
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};
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static struct resource alchemy_pci_def_iores = {
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.start = ALCHEMY_PCI_IOWIN_START,
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.end = ALCHEMY_PCI_IOWIN_END,
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.name = "PCI IO space",
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.flags = IORESOURCE_IO
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};
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static void mod_wired_entry(int entry, unsigned long entrylo0,
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unsigned long entrylo1, unsigned long entryhi,
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unsigned long pagemask)
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{
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unsigned long old_pagemask;
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unsigned long old_ctx;
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/* Save old context and create impossible VPN2 value */
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old_ctx = read_c0_entryhi() & 0xff;
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old_pagemask = read_c0_pagemask();
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write_c0_index(entry);
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write_c0_pagemask(pagemask);
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write_c0_entryhi(entryhi);
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write_c0_entrylo0(entrylo0);
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write_c0_entrylo1(entrylo1);
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tlb_write_indexed();
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write_c0_entryhi(old_ctx);
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write_c0_pagemask(old_pagemask);
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}
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static void alchemy_pci_wired_entry(struct alchemy_pci_context *ctx)
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{
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ctx->wired_entry = read_c0_wired();
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add_wired_entry(0, 0, (unsigned long)ctx->pci_cfg_vm->addr, PM_4K);
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ctx->last_elo0 = ctx->last_elo1 = ~0;
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}
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static int config_access(unsigned char access_type, struct pci_bus *bus,
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unsigned int dev_fn, unsigned char where, u32 *data)
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{
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struct alchemy_pci_context *ctx = bus->sysdata;
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unsigned int device = PCI_SLOT(dev_fn);
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unsigned int function = PCI_FUNC(dev_fn);
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unsigned long offset, status, cfg_base, flags, entryLo0, entryLo1, r;
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int error = PCIBIOS_SUCCESSFUL;
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if (device > 19) {
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*data = 0xffffffff;
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return -1;
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}
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local_irq_save(flags);
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r = __raw_readl(ctx->regs + PCI_REG_STATCMD) & 0x0000ffff;
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r |= PCI_STATCMD_STATUS(0x2000);
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__raw_writel(r, ctx->regs + PCI_REG_STATCMD);
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wmb();
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/* Allow board vendors to implement their own off-chip IDSEL.
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* If it doesn't succeed, may as well bail out at this point.
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*/
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if (ctx->board_pci_idsel(device, 1) == 0) {
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*data = 0xffffffff;
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local_irq_restore(flags);
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return -1;
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}
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/* Setup the config window */
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if (bus->number == 0)
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cfg_base = (1 << device) << 11;
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else
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cfg_base = 0x80000000 | (bus->number << 16) | (device << 11);
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/* Setup the lower bits of the 36-bit address */
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offset = (function << 8) | (where & ~0x3);
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/* Pick up any address that falls below the page mask */
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offset |= cfg_base & ~PAGE_MASK;
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/* Page boundary */
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cfg_base = cfg_base & PAGE_MASK;
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/* To improve performance, if the current device is the same as
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* the last device accessed, we don't touch the TLB.
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*/
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entryLo0 = (6 << 26) | (cfg_base >> 6) | (2 << 3) | 7;
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entryLo1 = (6 << 26) | (cfg_base >> 6) | (0x1000 >> 6) | (2 << 3) | 7;
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if ((entryLo0 != ctx->last_elo0) || (entryLo1 != ctx->last_elo1)) {
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mod_wired_entry(ctx->wired_entry, entryLo0, entryLo1,
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(unsigned long)ctx->pci_cfg_vm->addr, PM_4K);
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ctx->last_elo0 = entryLo0;
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ctx->last_elo1 = entryLo1;
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}
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if (access_type == PCI_ACCESS_WRITE)
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__raw_writel(*data, ctx->pci_cfg_vm->addr + offset);
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else
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*data = __raw_readl(ctx->pci_cfg_vm->addr + offset);
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wmb();
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DBG("alchemy-pci: cfg access %d bus %u dev %u at %x dat %x conf %lx\n",
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access_type, bus->number, device, where, *data, offset);
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/* check for errors, master abort */
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status = __raw_readl(ctx->regs + PCI_REG_STATCMD);
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if (status & (1 << 29)) {
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*data = 0xffffffff;
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error = -1;
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DBG("alchemy-pci: master abort on cfg access %d bus %d dev %d\n",
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access_type, bus->number, device);
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} else if ((status >> 28) & 0xf) {
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DBG("alchemy-pci: PCI ERR detected: dev %d, status %lx\n",
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device, (status >> 28) & 0xf);
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/* clear errors */
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__raw_writel(status & 0xf000ffff, ctx->regs + PCI_REG_STATCMD);
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*data = 0xffffffff;
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error = -1;
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}
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/* Take away the IDSEL. */
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(void)ctx->board_pci_idsel(device, 0);
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local_irq_restore(flags);
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return error;
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}
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static int read_config_byte(struct pci_bus *bus, unsigned int devfn,
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int where, u8 *val)
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{
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u32 data;
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int ret = config_access(PCI_ACCESS_READ, bus, devfn, where, &data);
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if (where & 1)
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data >>= 8;
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if (where & 2)
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data >>= 16;
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*val = data & 0xff;
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return ret;
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}
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static int read_config_word(struct pci_bus *bus, unsigned int devfn,
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int where, u16 *val)
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{
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u32 data;
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int ret = config_access(PCI_ACCESS_READ, bus, devfn, where, &data);
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if (where & 2)
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data >>= 16;
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*val = data & 0xffff;
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return ret;
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}
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static int read_config_dword(struct pci_bus *bus, unsigned int devfn,
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int where, u32 *val)
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{
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return config_access(PCI_ACCESS_READ, bus, devfn, where, val);
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}
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static int write_config_byte(struct pci_bus *bus, unsigned int devfn,
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int where, u8 val)
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{
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u32 data = 0;
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if (config_access(PCI_ACCESS_READ, bus, devfn, where, &data))
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return -1;
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data = (data & ~(0xff << ((where & 3) << 3))) |
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(val << ((where & 3) << 3));
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if (config_access(PCI_ACCESS_WRITE, bus, devfn, where, &data))
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return -1;
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return PCIBIOS_SUCCESSFUL;
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}
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static int write_config_word(struct pci_bus *bus, unsigned int devfn,
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int where, u16 val)
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{
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u32 data = 0;
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if (config_access(PCI_ACCESS_READ, bus, devfn, where, &data))
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return -1;
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data = (data & ~(0xffff << ((where & 3) << 3))) |
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(val << ((where & 3) << 3));
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if (config_access(PCI_ACCESS_WRITE, bus, devfn, where, &data))
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return -1;
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return PCIBIOS_SUCCESSFUL;
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}
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static int write_config_dword(struct pci_bus *bus, unsigned int devfn,
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int where, u32 val)
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{
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return config_access(PCI_ACCESS_WRITE, bus, devfn, where, &val);
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}
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static int alchemy_pci_read(struct pci_bus *bus, unsigned int devfn,
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int where, int size, u32 *val)
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{
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switch (size) {
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case 1: {
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u8 _val;
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int rc = read_config_byte(bus, devfn, where, &_val);
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*val = _val;
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return rc;
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}
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case 2: {
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u16 _val;
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int rc = read_config_word(bus, devfn, where, &_val);
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*val = _val;
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return rc;
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}
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default:
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return read_config_dword(bus, devfn, where, val);
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}
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}
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static int alchemy_pci_write(struct pci_bus *bus, unsigned int devfn,
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int where, int size, u32 val)
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{
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switch (size) {
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case 1:
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return write_config_byte(bus, devfn, where, (u8) val);
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case 2:
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return write_config_word(bus, devfn, where, (u16) val);
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default:
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return write_config_dword(bus, devfn, where, val);
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}
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}
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static struct pci_ops alchemy_pci_ops = {
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.read = alchemy_pci_read,
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.write = alchemy_pci_write,
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};
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static int alchemy_pci_def_idsel(unsigned int devsel, int assert)
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{
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return 1; /* success */
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}
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/* save PCI controller register contents. */
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static int alchemy_pci_suspend(void)
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{
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struct alchemy_pci_context *ctx = __alchemy_pci_ctx;
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if (!ctx)
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return 0;
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ctx->pm[0] = __raw_readl(ctx->regs + PCI_REG_CMEM);
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ctx->pm[1] = __raw_readl(ctx->regs + PCI_REG_CONFIG) & 0x0009ffff;
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ctx->pm[2] = __raw_readl(ctx->regs + PCI_REG_B2BMASK_CCH);
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ctx->pm[3] = __raw_readl(ctx->regs + PCI_REG_B2BBASE0_VID);
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ctx->pm[4] = __raw_readl(ctx->regs + PCI_REG_B2BBASE1_SID);
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ctx->pm[5] = __raw_readl(ctx->regs + PCI_REG_MWMASK_DEV);
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ctx->pm[6] = __raw_readl(ctx->regs + PCI_REG_MWBASE_REV_CCL);
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ctx->pm[7] = __raw_readl(ctx->regs + PCI_REG_ID);
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ctx->pm[8] = __raw_readl(ctx->regs + PCI_REG_CLASSREV);
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ctx->pm[9] = __raw_readl(ctx->regs + PCI_REG_PARAM);
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ctx->pm[10] = __raw_readl(ctx->regs + PCI_REG_MBAR);
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ctx->pm[11] = __raw_readl(ctx->regs + PCI_REG_TIMEOUT);
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return 0;
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}
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static void alchemy_pci_resume(void)
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{
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struct alchemy_pci_context *ctx = __alchemy_pci_ctx;
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if (!ctx)
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return;
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__raw_writel(ctx->pm[0], ctx->regs + PCI_REG_CMEM);
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__raw_writel(ctx->pm[2], ctx->regs + PCI_REG_B2BMASK_CCH);
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__raw_writel(ctx->pm[3], ctx->regs + PCI_REG_B2BBASE0_VID);
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__raw_writel(ctx->pm[4], ctx->regs + PCI_REG_B2BBASE1_SID);
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__raw_writel(ctx->pm[5], ctx->regs + PCI_REG_MWMASK_DEV);
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__raw_writel(ctx->pm[6], ctx->regs + PCI_REG_MWBASE_REV_CCL);
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__raw_writel(ctx->pm[7], ctx->regs + PCI_REG_ID);
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__raw_writel(ctx->pm[8], ctx->regs + PCI_REG_CLASSREV);
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__raw_writel(ctx->pm[9], ctx->regs + PCI_REG_PARAM);
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__raw_writel(ctx->pm[10], ctx->regs + PCI_REG_MBAR);
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__raw_writel(ctx->pm[11], ctx->regs + PCI_REG_TIMEOUT);
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wmb();
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__raw_writel(ctx->pm[1], ctx->regs + PCI_REG_CONFIG);
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wmb();
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/* YAMON on all db1xxx boards wipes the TLB and writes zero to C0_wired
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* on resume, making it necessary to recreate it as soon as possible.
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*/
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ctx->wired_entry = 8191; /* impossibly high value */
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alchemy_pci_wired_entry(ctx); /* install it */
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}
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static struct syscore_ops alchemy_pci_pmops = {
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.suspend = alchemy_pci_suspend,
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.resume = alchemy_pci_resume,
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};
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static int alchemy_pci_probe(struct platform_device *pdev)
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{
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struct alchemy_pci_platdata *pd = pdev->dev.platform_data;
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struct alchemy_pci_context *ctx;
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void __iomem *virt_io;
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unsigned long val;
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struct resource *r;
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int ret;
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/* need at least PCI IRQ mapping table */
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if (!pd) {
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dev_err(&pdev->dev, "need platform data for PCI setup\n");
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ret = -ENODEV;
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goto out;
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}
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ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
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if (!ctx) {
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dev_err(&pdev->dev, "no memory for pcictl context\n");
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ret = -ENOMEM;
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goto out;
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}
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r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!r) {
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dev_err(&pdev->dev, "no pcictl ctrl regs resource\n");
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ret = -ENODEV;
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goto out1;
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}
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if (!request_mem_region(r->start, resource_size(r), pdev->name)) {
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dev_err(&pdev->dev, "cannot claim pci regs\n");
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ret = -ENODEV;
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goto out1;
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}
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ctx->regs = ioremap_nocache(r->start, resource_size(r));
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if (!ctx->regs) {
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dev_err(&pdev->dev, "cannot map pci regs\n");
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ret = -ENODEV;
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goto out2;
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}
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/* map parts of the PCI IO area */
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/* REVISIT: if this changes with a newer variant (doubt it) make this
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* a platform resource.
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*/
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virt_io = ioremap(AU1500_PCI_IO_PHYS_ADDR, 0x00100000);
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if (!virt_io) {
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dev_err(&pdev->dev, "cannot remap pci io space\n");
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ret = -ENODEV;
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goto out3;
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}
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ctx->alchemy_pci_ctrl.io_map_base = (unsigned long)virt_io;
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#ifdef CONFIG_DMA_NONCOHERENT
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/* Au1500 revisions older than AD have borked coherent PCI */
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if ((alchemy_get_cputype() == ALCHEMY_CPU_AU1500) &&
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(read_c0_prid() < 0x01030202)) {
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val = __raw_readl(ctx->regs + PCI_REG_CONFIG);
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val |= PCI_CONFIG_NC;
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__raw_writel(val, ctx->regs + PCI_REG_CONFIG);
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wmb();
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dev_info(&pdev->dev, "non-coherent PCI on Au1500 AA/AB/AC\n");
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}
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#endif
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if (pd->board_map_irq)
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ctx->board_map_irq = pd->board_map_irq;
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if (pd->board_pci_idsel)
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ctx->board_pci_idsel = pd->board_pci_idsel;
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else
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ctx->board_pci_idsel = alchemy_pci_def_idsel;
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/* fill in relevant pci_controller members */
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ctx->alchemy_pci_ctrl.pci_ops = &alchemy_pci_ops;
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ctx->alchemy_pci_ctrl.mem_resource = &alchemy_pci_def_memres;
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ctx->alchemy_pci_ctrl.io_resource = &alchemy_pci_def_iores;
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/* we can't ioremap the entire pci config space because it's too large,
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* nor can we dynamically ioremap it because some drivers use the
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* PCI config routines from within atomic contex and that becomes a
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* problem in get_vm_area(). Instead we use one wired TLB entry to
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* handle all config accesses for all busses.
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*/
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ctx->pci_cfg_vm = get_vm_area(0x2000, VM_IOREMAP);
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if (!ctx->pci_cfg_vm) {
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dev_err(&pdev->dev, "unable to get vm area\n");
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ret = -ENOMEM;
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goto out4;
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}
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ctx->wired_entry = 8191; /* impossibly high value */
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alchemy_pci_wired_entry(ctx); /* install it */
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set_io_port_base((unsigned long)ctx->alchemy_pci_ctrl.io_map_base);
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/* board may want to modify bits in the config register, do it now */
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val = __raw_readl(ctx->regs + PCI_REG_CONFIG);
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val &= ~pd->pci_cfg_clr;
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val |= pd->pci_cfg_set;
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val &= ~PCI_CONFIG_PD; /* clear disable bit */
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__raw_writel(val, ctx->regs + PCI_REG_CONFIG);
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wmb();
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__alchemy_pci_ctx = ctx;
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platform_set_drvdata(pdev, ctx);
|
|
register_syscore_ops(&alchemy_pci_pmops);
|
|
register_pci_controller(&ctx->alchemy_pci_ctrl);
|
|
|
|
return 0;
|
|
|
|
out4:
|
|
iounmap(virt_io);
|
|
out3:
|
|
iounmap(ctx->regs);
|
|
out2:
|
|
release_mem_region(r->start, resource_size(r));
|
|
out1:
|
|
kfree(ctx);
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static struct platform_driver alchemy_pcictl_driver = {
|
|
.probe = alchemy_pci_probe,
|
|
.driver = {
|
|
.name = "alchemy-pci",
|
|
.owner = THIS_MODULE,
|
|
},
|
|
};
|
|
|
|
static int __init alchemy_pci_init(void)
|
|
{
|
|
/* Au1500/Au1550 have PCI */
|
|
switch (alchemy_get_cputype()) {
|
|
case ALCHEMY_CPU_AU1500:
|
|
case ALCHEMY_CPU_AU1550:
|
|
return platform_driver_register(&alchemy_pcictl_driver);
|
|
}
|
|
return 0;
|
|
}
|
|
arch_initcall(alchemy_pci_init);
|
|
|
|
|
|
int __init pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
|
|
{
|
|
struct alchemy_pci_context *ctx = dev->sysdata;
|
|
if (ctx && ctx->board_map_irq)
|
|
return ctx->board_map_irq(dev, slot, pin);
|
|
return -1;
|
|
}
|
|
|
|
int pcibios_plat_dev_init(struct pci_dev *dev)
|
|
{
|
|
return 0;
|
|
}
|