diff options
Diffstat (limited to 'arch/mips/pci/ops-au1000.c')
| -rw-r--r-- | arch/mips/pci/ops-au1000.c | 325 |
1 files changed, 325 insertions, 0 deletions
diff --git a/arch/mips/pci/ops-au1000.c b/arch/mips/pci/ops-au1000.c new file mode 100644 index 00000000000..c1c91ca0f9c --- /dev/null +++ b/arch/mips/pci/ops-au1000.c @@ -0,0 +1,325 @@ +/* + * BRIEF MODULE DESCRIPTION + * Alchemy/AMD Au1x00 pci support. + * + * Copyright 2001,2002,2003 MontaVista Software Inc. + * Author: MontaVista Software, Inc. + * ppopov@mvista.com or source@mvista.com + * + * Support for all devices (greater than 16) added by David Gathright. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the + * Free Software Foundation; either version 2 of the License, or (at your + * option) any later version. + * + * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED + * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN + * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT + * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF + * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON + * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF + * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 675 Mass Ave, Cambridge, MA 02139, USA. + */ +#include <linux/config.h> +#include <linux/types.h> +#include <linux/pci.h> +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/vmalloc.h> + +#include <asm/mach-au1x00/au1000.h> + +#undef DEBUG +#ifdef DEBUG +#define DBG(x...) printk(x) +#else +#define DBG(x...) +#endif + +#define PCI_ACCESS_READ 0 +#define PCI_ACCESS_WRITE 1 + + +int (*board_pci_idsel)(unsigned int devsel, int assert); + +/* CP0 hazard avoidance. */ +#define BARRIER __asm__ __volatile__(".set noreorder\n\t" \ + "nop; nop; nop; nop;\t" \ + ".set reorder\n\t") + +void mod_wired_entry(int entry, unsigned long entrylo0, + unsigned long entrylo1, unsigned long entryhi, + unsigned long pagemask) +{ + unsigned long old_pagemask; + unsigned long old_ctx; + + /* Save old context and create impossible VPN2 value */ + old_ctx = read_c0_entryhi() & 0xff; + old_pagemask = read_c0_pagemask(); + write_c0_index(entry); + BARRIER; + write_c0_pagemask(pagemask); + write_c0_entryhi(entryhi); + write_c0_entrylo0(entrylo0); + write_c0_entrylo1(entrylo1); + BARRIER; + tlb_write_indexed(); + BARRIER; + write_c0_entryhi(old_ctx); + BARRIER; + write_c0_pagemask(old_pagemask); +} + +struct vm_struct *pci_cfg_vm; +static int pci_cfg_wired_entry; +static int first_cfg = 1; +unsigned long last_entryLo0, last_entryLo1; + +static int config_access(unsigned char access_type, struct pci_bus *bus, + unsigned int dev_fn, unsigned char where, + u32 * data) +{ +#if defined( CONFIG_SOC_AU1500 ) || defined( CONFIG_SOC_AU1550 ) + unsigned int device = PCI_SLOT(dev_fn); + unsigned int function = PCI_FUNC(dev_fn); + unsigned long offset, status; + unsigned long cfg_base; + unsigned long flags; + int error = PCIBIOS_SUCCESSFUL; + unsigned long entryLo0, entryLo1; + + if (device > 19) { + *data = 0xffffffff; + return -1; + } + + local_irq_save(flags); + au_writel(((0x2000 << 16) | (au_readl(Au1500_PCI_STATCMD) & 0xffff)), + Au1500_PCI_STATCMD); + au_sync_udelay(1); + + /* + * We can't ioremap the entire pci config space because it's + * too large. Nor can we call ioremap dynamically because some + * device drivers use the pci config routines from within + * interrupt handlers and that becomes a problem in get_vm_area(). + * We use one wired tlb to handle all config accesses for all + * busses. To improve performance, if the current device + * is the same as the last device accessed, we don't touch the + * tlb. + */ + if (first_cfg) { + /* reserve a wired entry for pci config accesses */ + first_cfg = 0; + pci_cfg_vm = get_vm_area(0x2000, 0); + if (!pci_cfg_vm) + panic (KERN_ERR "PCI unable to get vm area\n"); + pci_cfg_wired_entry = read_c0_wired(); + add_wired_entry(0, 0, (unsigned long)pci_cfg_vm->addr, PM_4K); + last_entryLo0 = last_entryLo1 = 0xffffffff; + } + + /* Since the Au1xxx doesn't do the idsel timing exactly to spec, + * many board vendors implement their own off-chip idsel, so call + * it now. If it doesn't succeed, may as well bail out at this point. + */ + if (board_pci_idsel) { + if (board_pci_idsel(device, 1) == 0) { + *data = 0xffffffff; + local_irq_restore(flags); + return -1; + } + } + + /* setup the config window */ + if (bus->number == 0) { + cfg_base = ((1<<device)<<11); + } else { + cfg_base = 0x80000000 | (bus->number<<16) | (device<<11); + } + + /* setup the lower bits of the 36 bit address */ + offset = (function << 8) | (where & ~0x3); + /* pick up any address that falls below the page mask */ + offset |= cfg_base & ~PAGE_MASK; + + /* page boundary */ + cfg_base = cfg_base & PAGE_MASK; + + entryLo0 = (6 << 26) | (cfg_base >> 6) | (2 << 3) | 7; + entryLo1 = (6 << 26) | (cfg_base >> 6) | (0x1000 >> 6) | (2 << 3) | 7; + + if ((entryLo0 != last_entryLo0) || (entryLo1 != last_entryLo1)) { + mod_wired_entry(pci_cfg_wired_entry, entryLo0, entryLo1, + (unsigned long)pci_cfg_vm->addr, PM_4K); + last_entryLo0 = entryLo0; + last_entryLo1 = entryLo1; + } + + if (access_type == PCI_ACCESS_WRITE) { + au_writel(*data, (int)(pci_cfg_vm->addr + offset)); + } else { + *data = au_readl((int)(pci_cfg_vm->addr + offset)); + } + au_sync_udelay(2); + + DBG("cfg_access %d bus->number %d dev %d at %x *data %x conf %x\n", + access_type, bus->number, device, where, *data, offset); + + /* check master abort */ + status = au_readl(Au1500_PCI_STATCMD); + + if (status & (1<<29)) { + *data = 0xffffffff; + error = -1; + DBG("Au1x Master Abort\n"); + } else if ((status >> 28) & 0xf) { + DBG("PCI ERR detected: status %x\n", status); + *data = 0xffffffff; + error = -1; + } + + /* Take away the idsel. + */ + if (board_pci_idsel) { + (void)board_pci_idsel(device, 0); + } + + local_irq_restore(flags); + return error; +#endif +} + +static int read_config_byte(struct pci_bus *bus, unsigned int devfn, + int where, u8 * val) +{ + u32 data; + int ret; + + ret = config_access(PCI_ACCESS_READ, bus, devfn, where, &data); + if (where & 1) + data >>= 8; + if (where & 2) + data >>= 16; + *val = data & 0xff; + return ret; +} + + +static int read_config_word(struct pci_bus *bus, unsigned int devfn, + int where, u16 * val) +{ + u32 data; + int ret; + + ret = config_access(PCI_ACCESS_READ, bus, devfn, where, &data); + if (where & 2) + data >>= 16; + *val = data & 0xffff; + return ret; +} + +static int read_config_dword(struct pci_bus *bus, unsigned int devfn, + int where, u32 * val) +{ + int ret; + + ret = config_access(PCI_ACCESS_READ, bus, devfn, where, val); + return ret; +} + +static int +write_config_byte(struct pci_bus *bus, unsigned int devfn, int where, + u8 val) +{ + u32 data = 0; + + if (config_access(PCI_ACCESS_READ, bus, devfn, where, &data)) + return -1; + + data = (data & ~(0xff << ((where & 3) << 3))) | + (val << ((where & 3) << 3)); + + if (config_access(PCI_ACCESS_WRITE, bus, devfn, where, &data)) + return -1; + + return PCIBIOS_SUCCESSFUL; +} + +static int +write_config_word(struct pci_bus *bus, unsigned int devfn, int where, + u16 val) +{ + u32 data = 0; + + if (config_access(PCI_ACCESS_READ, bus, devfn, where, &data)) + return -1; + + data = (data & ~(0xffff << ((where & 3) << 3))) | + (val << ((where & 3) << 3)); + + if (config_access(PCI_ACCESS_WRITE, bus, devfn, where, &data)) + return -1; + + + return PCIBIOS_SUCCESSFUL; +} + +static int +write_config_dword(struct pci_bus *bus, unsigned int devfn, int where, + u32 val) +{ + if (config_access(PCI_ACCESS_WRITE, bus, devfn, where, &val)) + return -1; + + return PCIBIOS_SUCCESSFUL; +} + +static int config_read(struct pci_bus *bus, unsigned int devfn, + int where, int size, u32 * val) +{ + switch (size) { + case 1: { + u8 _val; + int rc = read_config_byte(bus, devfn, where, &_val); + *val = _val; + return rc; + } + case 2: { + u16 _val; + int rc = read_config_word(bus, devfn, where, &_val); + *val = _val; + return rc; + } + default: + return read_config_dword(bus, devfn, where, val); + } +} + +static int config_write(struct pci_bus *bus, unsigned int devfn, + int where, int size, u32 val) +{ + switch (size) { + case 1: + return write_config_byte(bus, devfn, where, (u8) val); + case 2: + return write_config_word(bus, devfn, where, (u16) val); + default: + return write_config_dword(bus, devfn, where, val); + } +} + + +struct pci_ops au1x_pci_ops = { + config_read, + config_write +}; |