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-rw-r--r--arch/mips/ddb5xxx/ddb5477/pci_ops.c416
1 files changed, 416 insertions, 0 deletions
diff --git a/arch/mips/ddb5xxx/ddb5477/pci_ops.c b/arch/mips/ddb5xxx/ddb5477/pci_ops.c
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index 000000000..3bd3e2189
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+++ b/arch/mips/ddb5xxx/ddb5477/pci_ops.c
@@ -0,0 +1,416 @@
+/***********************************************************************
+ * Copyright 2001 MontaVista Software Inc.
+ * Author: Jun Sun, jsun@mvista.com or jsun@junsun.net
+ *
+ * arch/mips/ddb5xxx/ddb5477/pci_ops.c
+ * Define the pci_ops for DB5477.
+ *
+ * Much of the code is derived from the original DDB5074 port by
+ * Geert Uytterhoeven <geert@sonycom.com>
+ *
+ * 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.
+ ***********************************************************************
+ */
+
+/*
+ * DDB5477 has two PCI channels, external PCI and IOPIC (internal)
+ * Therefore we provide two sets of pci_ops.
+ */
+
+#include <linux/config.h>
+#include <linux/pci.h>
+#include <linux/kernel.h>
+#include <linux/types.h>
+
+#include <asm/addrspace.h>
+#include <asm/ddb5xxx/debug.h>
+#include <asm/ddb5xxx/ddb5xxx.h>
+
+/*
+ * config_swap structure records what set of pdar/pmr are used
+ * to access pci config space. It also provides a place hold the
+ * original values for future restoring.
+ */
+struct pci_config_swap {
+ u32 pdar;
+ u32 pmr;
+ u32 config_base;
+ u32 config_size;
+ u32 pdar_backup;
+ u32 pmr_backup;
+};
+
+/*
+ * On DDB5477, we have two sets of swap registers, for ext PCI and IOPCI.
+ */
+struct pci_config_swap ext_pci_swap = {
+ DDB_PCIW0,
+ DDB_PCIINIT00,
+ DDB_PCI0_CONFIG_BASE,
+ DDB_PCI0_CONFIG_SIZE
+};
+struct pci_config_swap io_pci_swap = {
+ DDB_IOPCIW0,
+ DDB_PCIINIT01,
+ DDB_PCI1_CONFIG_BASE,
+ DDB_PCI1_CONFIG_SIZE
+};
+
+
+/*
+ * access config space
+ */
+static inline u32 ddb_access_config_base(struct pci_config_swap *swap,
+ u32 bus,/* 0 means top level bus */
+ u32 slot_num)
+{
+ u32 pci_addr = 0;
+ u32 pciinit_offset = 0;
+ u32 virt_addr = swap->config_base;
+ u32 option;
+
+ /* [jsun] hack for testing */
+ // if (slot_num == 4) slot_num = 0;
+
+ /* minimum pdar (window) size is 2MB */
+ MIPS_ASSERT(swap->config_size >= (2 << 20));
+
+ MIPS_ASSERT(slot_num < (1 << 5));
+ MIPS_ASSERT(bus < (1 << 8));
+
+ /* backup registers */
+ swap->pdar_backup = ddb_in32(swap->pdar);
+ swap->pmr_backup = ddb_in32(swap->pmr);
+
+ /* set the pdar (pci window) register */
+ ddb_set_pdar(swap->pdar,
+ swap->config_base,
+ swap->config_size,
+ 32, /* 32 bit wide */
+ 0, /* not on local memory bus */
+ 0); /* not visible from PCI bus (N/A) */
+
+ /*
+ * calcuate the absolute pci config addr;
+ * according to the spec, we start scanning from adr:11 (0x800)
+ */
+ if (bus == 0) {
+ /* type 0 config */
+ pci_addr = 0x800 << slot_num;
+ } else {
+ /* type 1 config */
+ pci_addr = (bus << 16) | (slot_num << 11);
+ panic("ddb_access_config_base: we don't support type 1 config Yet");
+ }
+
+ /*
+ * if pci_addr is less than pci config window size, we set
+ * pciinit_offset to 0 and adjust the virt_address.
+ * Otherwise we will try to adjust pciinit_offset.
+ */
+ if (pci_addr < swap->config_size) {
+ virt_addr = KSEG1ADDR(swap->config_base + pci_addr);
+ pciinit_offset = 0;
+ } else {
+ MIPS_ASSERT( (pci_addr & (swap->config_size - 1)) == 0);
+ virt_addr = KSEG1ADDR(swap->config_base);
+ pciinit_offset = pci_addr;
+ }
+
+ /* set the pmr register */
+ option = DDB_PCI_ACCESS_32;
+ if (bus != 0) option |= DDB_PCI_CFGTYPE1;
+ ddb_set_pmr(swap->pmr, DDB_PCICMD_CFG, pciinit_offset, option);
+
+ return virt_addr;
+}
+
+static inline void ddb_close_config_base(struct pci_config_swap *swap)
+{
+ ddb_out32(swap->pdar, swap->pdar_backup);
+ ddb_out32(swap->pmr, swap->pmr_backup);
+}
+
+static int read_config_dword(struct pci_config_swap *swap,
+ struct pci_dev *dev,
+ u32 where,
+ u32 *val)
+{
+ u32 bus, slot_num, func_num;
+ u32 base;
+
+ MIPS_ASSERT((where & 3) == 0);
+ MIPS_ASSERT(where < (1 << 8));
+
+ /* check if the bus is top-level */
+ if (dev->bus->parent != NULL) {
+ bus = dev->bus->number;
+ MIPS_ASSERT(bus != 0);
+ } else {
+ bus = 0;
+ }
+
+ slot_num = PCI_SLOT(dev->devfn);
+ func_num = PCI_FUNC(dev->devfn);
+ base = ddb_access_config_base(swap, bus, slot_num);
+ *val = *(volatile u32*) (base + (func_num << 8) + where);
+ ddb_close_config_base(swap);
+ return PCIBIOS_SUCCESSFUL;
+}
+
+static int read_config_word(struct pci_config_swap *swap,
+ struct pci_dev *dev,
+ u32 where,
+ u16 *val)
+{
+ int status;
+ u32 result;
+
+ MIPS_ASSERT((where & 1) == 0);
+
+ status = read_config_dword(swap, dev, where & ~3, &result);
+ if (where & 2) result >>= 16;
+ *val = result & 0xffff;
+ return status;
+}
+
+static int read_config_byte(struct pci_config_swap *swap,
+ struct pci_dev *dev,
+ u32 where,
+ u8 *val)
+{
+ int status;
+ u32 result;
+
+ status = read_config_dword(swap, dev, where & ~3, &result);
+ if (where & 1) result >>= 8;
+ if (where & 2) result >>= 16;
+ *val = result & 0xff;
+ return status;
+}
+
+static int write_config_dword(struct pci_config_swap *swap,
+ struct pci_dev *dev,
+ u32 where,
+ u32 val)
+{
+ u32 bus, slot_num, func_num;
+ u32 base;
+
+ MIPS_ASSERT((where & 3) == 0);
+ MIPS_ASSERT(where < (1 << 8));
+
+ /* check if the bus is top-level */
+ if (dev->bus->parent != NULL) {
+ bus = dev->bus->number;
+ MIPS_ASSERT(bus != 0);
+ } else {
+ bus = 0;
+ }
+
+ slot_num = PCI_SLOT(dev->devfn);
+ func_num = PCI_FUNC(dev->devfn);
+ base = ddb_access_config_base(swap, bus, slot_num);
+ *(volatile u32*) (base + (func_num << 8) + where) = val;
+ ddb_close_config_base(swap);
+ return PCIBIOS_SUCCESSFUL;
+}
+
+static int write_config_word(struct pci_config_swap *swap,
+ struct pci_dev *dev,
+ u32 where,
+ u16 val)
+{
+ int status, shift=0;
+ u32 result;
+
+ MIPS_ASSERT((where & 1) == 0);
+
+ status = read_config_dword(swap, dev, where & ~3, &result);
+ if (status != PCIBIOS_SUCCESSFUL) return status;
+
+ if (where & 2)
+ shift += 16;
+ result &= ~(0xffff << shift);
+ result |= val << shift;
+ return write_config_dword(swap, dev, where & ~3, result);
+}
+
+static int write_config_byte(struct pci_config_swap *swap,
+ struct pci_dev *dev,
+ u32 where,
+ u8 val)
+{
+ int status, shift=0;
+ u32 result;
+
+ status = read_config_dword(swap, dev, where & ~3, &result);
+ if (status != PCIBIOS_SUCCESSFUL) return status;
+
+ if (where & 2)
+ shift += 16;
+ if (where & 1)
+ shift += 8;
+ result &= ~(0xff << shift);
+ result |= val << shift;
+ return write_config_dword(swap, dev, where & ~3, result);
+}
+
+#define MAKE_PCI_OPS(prefix, rw, unitname, unittype, pciswap) \
+static int prefix##_##rw##_config_##unitname(struct pci_dev *dev, int where, unittype val) \
+{ \
+ return rw##_config_##unitname(pciswap, \
+ dev, \
+ where, \
+ val); \
+}
+
+MAKE_PCI_OPS(extpci, read, byte, u8 *, &ext_pci_swap)
+MAKE_PCI_OPS(extpci, read, word, u16 *, &ext_pci_swap)
+MAKE_PCI_OPS(extpci, read, dword, u32 *, &ext_pci_swap)
+
+MAKE_PCI_OPS(iopci, read, byte, u8 *, &io_pci_swap)
+MAKE_PCI_OPS(iopci, read, word, u16 *, &io_pci_swap)
+MAKE_PCI_OPS(iopci, read, dword, u32 *, &io_pci_swap)
+
+MAKE_PCI_OPS(extpci, write, byte, u8, &ext_pci_swap)
+MAKE_PCI_OPS(extpci, write, word, u16, &ext_pci_swap)
+MAKE_PCI_OPS(extpci, write, dword, u32, &ext_pci_swap)
+
+MAKE_PCI_OPS(iopci, write, byte, u8, &io_pci_swap)
+MAKE_PCI_OPS(iopci, write, word, u16, &io_pci_swap)
+MAKE_PCI_OPS(iopci, write, dword, u32, &io_pci_swap)
+
+struct pci_ops ddb5477_ext_pci_ops ={
+ extpci_read_config_byte,
+ extpci_read_config_word,
+ extpci_read_config_dword,
+ extpci_write_config_byte,
+ extpci_write_config_word,
+ extpci_write_config_dword
+};
+
+
+struct pci_ops ddb5477_io_pci_ops ={
+ iopci_read_config_byte,
+ iopci_read_config_word,
+ iopci_read_config_dword,
+ iopci_write_config_byte,
+ iopci_write_config_word,
+ iopci_write_config_dword
+};
+
+#if defined(CONFIG_LL_DEBUG)
+void jsun_scan_pci_bus(void)
+{
+ struct pci_bus bus;
+ struct pci_dev dev;
+ unsigned int devfn;
+ int j;
+
+ bus.parent = NULL; /* we scan the top level only */
+ dev.bus = &bus;
+ dev.sysdata = NULL;
+
+ /* scan ext pci bus and io pci bus*/
+ for (j=0; j< 2; j++) {
+ if (j == 0) {
+ printk("scan ddb5477 external PCI bus:\n");
+ bus.ops = &ddb5477_ext_pci_ops;
+ } else {
+ printk("scan ddb5477 IO PCI bus:\n");
+ bus.ops = &ddb5477_io_pci_ops;
+ }
+
+ for (devfn = 0; devfn < 0x100; devfn += 8) {
+ u32 temp;
+ u16 temp16;
+ u8 temp8;
+ int i;
+
+ dev.devfn = devfn;
+ MIPS_VERIFY(pci_read_config_dword(&dev, 0, &temp),
+ == PCIBIOS_SUCCESSFUL);
+ if (temp == 0xffffffff) continue;
+
+ printk("slot %d: (addr %d) \n", devfn/8, 11+devfn/8);
+
+ /* verify read word and byte */
+ MIPS_VERIFY(pci_read_config_word(&dev, 2, &temp16),
+ == PCIBIOS_SUCCESSFUL);
+ MIPS_ASSERT(temp16 == (temp >> 16));
+ MIPS_VERIFY(pci_read_config_byte(&dev, 3, &temp8),
+ == PCIBIOS_SUCCESSFUL);
+ MIPS_ASSERT(temp8 == (temp >> 24));
+ MIPS_VERIFY(pci_read_config_byte(&dev, 1, &temp8),
+ == PCIBIOS_SUCCESSFUL);
+ MIPS_ASSERT(temp8 == ((temp >> 8) & 0xff));
+
+ for (i=0; i < 16; i++) {
+ MIPS_VERIFY(pci_read_config_dword(&dev, i*4, &temp),
+ == PCIBIOS_SUCCESSFUL);
+ printk("\t%08X", temp);
+ if ((i%4) == 3) printk("\n");
+ }
+ }
+ }
+}
+
+
+static void jsun_hardcode_pci_resources_eepro(void)
+{
+ struct pci_bus bus;
+ struct pci_dev dev;
+ u32 temp;
+
+ bus.parent = NULL; /* we scan the top level only */
+ bus.ops = &ddb5477_ext_pci_ops;
+ dev.bus = &bus;
+ dev.sysdata = NULL;
+
+ /* for slot 5 (ext pci 1) eepro card */
+ dev.devfn = 5*8;
+ pci_read_config_dword(&dev, 0, &temp);
+ MIPS_ASSERT(temp == 0x12298086);
+
+ pci_write_config_dword(&dev, PCI_BASE_ADDRESS_0, DDB_PCI0_MEM_BASE);
+ pci_write_config_dword(&dev, PCI_BASE_ADDRESS_1, 0);
+ pci_write_config_dword(&dev, PCI_BASE_ADDRESS_2, DDB_PCI0_MEM_BASE+0x100000);
+ pci_write_config_dword(&dev, PCI_INTERRUPT_LINE, 17);
+}
+
+static void jsun_hardcode_pci_resources_onboard_tulip(void)
+{
+ struct pci_bus bus;
+ struct pci_dev dev;
+ u32 temp;
+
+ bus.parent = NULL; /* we scan the top level only */
+ bus.ops = &ddb5477_ext_pci_ops;
+ dev.bus = &bus;
+ dev.sysdata = NULL;
+
+ /* for slot 4 on board ether chip */
+ dev.devfn = 4*8;
+ pci_read_config_dword(&dev, 0, &temp);
+ MIPS_ASSERT(temp == 0x00191011);
+
+ pci_write_config_dword(&dev, PCI_BASE_ADDRESS_0, 0x1000);
+ pci_write_config_dword(&dev, PCI_BASE_ADDRESS_1, DDB_PCI0_MEM_BASE);
+ pci_write_config_dword(&dev, PCI_INTERRUPT_LINE, 16);
+}
+
+static void jsun_hardcode_pci_resources(void)
+{
+ jsun_hardcode_pci_resources_onboard_tulip();
+}
+
+void jsun_assign_pci_resource(void)
+{
+ jsun_hardcode_pci_resources();
+}
+
+#endif
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