summaryrefslogtreecommitdiffstats
path: root/arch/mips/pci/ops-au1000.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/mips/pci/ops-au1000.c')
-rw-r--r--arch/mips/pci/ops-au1000.c325
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
+};
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-11-12 19:27:08 +0000