^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Routines for tracking a legacy ISA bridge
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyrigh 2007 Benjamin Herrenschmidt <benh@kernel.crashing.org>, IBM Corp.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * Some bits and pieces moved over from pci_64.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) * Copyrigh 2003 Anton Blanchard <anton@au.ibm.com>, IBM Corp.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #define DEBUG
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/pci.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/export.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <linux/notifier.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <linux/vmalloc.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include <asm/processor.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #include <asm/io.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #include <asm/prom.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #include <asm/pci-bridge.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #include <asm/machdep.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) #include <asm/ppc-pci.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) #include <asm/isa-bridge.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) unsigned long isa_io_base; /* NULL if no ISA bus */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) EXPORT_SYMBOL(isa_io_base);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) /* Cached ISA bridge dev. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) static struct device_node *isa_bridge_devnode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) struct pci_dev *isa_bridge_pcidev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) EXPORT_SYMBOL_GPL(isa_bridge_pcidev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) #define ISA_SPACE_MASK 0x1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) #define ISA_SPACE_IO 0x1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) static void remap_isa_base(phys_addr_t pa, unsigned long size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) WARN_ON_ONCE(ISA_IO_BASE & ~PAGE_MASK);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) WARN_ON_ONCE(pa & ~PAGE_MASK);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) WARN_ON_ONCE(size & ~PAGE_MASK);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) if (slab_is_available()) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) if (ioremap_page_range(ISA_IO_BASE, ISA_IO_BASE + size, pa,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) pgprot_noncached(PAGE_KERNEL)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) unmap_kernel_range(ISA_IO_BASE, size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) early_ioremap_range(ISA_IO_BASE, pa, size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) pgprot_noncached(PAGE_KERNEL));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) static void pci_process_ISA_OF_ranges(struct device_node *isa_node,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) unsigned long phb_io_base_phys)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) /* We should get some saner parsing here and remove these structs */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) struct pci_address {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) u32 a_hi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) u32 a_mid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) u32 a_lo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) struct isa_address {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) u32 a_hi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) u32 a_lo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) struct isa_range {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) struct isa_address isa_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) struct pci_address pci_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) unsigned int size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) const struct isa_range *range;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) unsigned long pci_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) unsigned int isa_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) unsigned int size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) int rlen = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) range = of_get_property(isa_node, "ranges", &rlen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) if (range == NULL || (rlen < sizeof(struct isa_range)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) goto inval_range;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) /* From "ISA Binding to 1275"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) * The ranges property is laid out as an array of elements,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) * each of which comprises:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) * cells 0 - 1: an ISA address
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) * cells 2 - 4: a PCI address
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) * (size depending on dev->n_addr_cells)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) * cell 5: the size of the range
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) if ((range->isa_addr.a_hi & ISA_SPACE_MASK) != ISA_SPACE_IO) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) range++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) rlen -= sizeof(struct isa_range);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) if (rlen < sizeof(struct isa_range))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) goto inval_range;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) if ((range->isa_addr.a_hi & ISA_SPACE_MASK) != ISA_SPACE_IO)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) goto inval_range;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) isa_addr = range->isa_addr.a_lo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) pci_addr = (unsigned long) range->pci_addr.a_mid << 32 |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) range->pci_addr.a_lo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) /* Assume these are both zero. Note: We could fix that and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) * do a proper parsing instead ... oh well, that will do for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) * now as nobody uses fancy mappings for ISA bridges
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) if ((pci_addr != 0) || (isa_addr != 0)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) printk(KERN_ERR "unexpected isa to pci mapping: %s\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) __func__);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) /* Align size and make sure it's cropped to 64K */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) size = PAGE_ALIGN(range->size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) if (size > 0x10000)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) size = 0x10000;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) remap_isa_base(phb_io_base_phys, size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) inval_range:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) printk(KERN_ERR "no ISA IO ranges or unexpected isa range, "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) "mapping 64k\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) remap_isa_base(phb_io_base_phys, 0x10000);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) * isa_bridge_find_early - Find and map the ISA IO space early before
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) * main PCI discovery. This is optionally called by
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) * the arch code when adding PCI PHBs to get early
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) * access to ISA IO ports
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) void __init isa_bridge_find_early(struct pci_controller *hose)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) struct device_node *np, *parent = NULL, *tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) /* If we already have an ISA bridge, bail off */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) if (isa_bridge_devnode != NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) /* For each "isa" node in the system. Note : we do a search by
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) * type and not by name. It might be better to do by name but that's
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) * what the code used to do and I don't want to break too much at
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) * once. We can look into changing that separately
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) for_each_node_by_type(np, "isa") {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) /* Look for our hose being a parent */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) for (parent = of_get_parent(np); parent;) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) if (parent == hose->dn) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) of_node_put(parent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) tmp = parent;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) parent = of_get_parent(parent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) of_node_put(tmp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) if (parent != NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) if (np == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) isa_bridge_devnode = np;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) /* Now parse the "ranges" property and setup the ISA mapping */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) pci_process_ISA_OF_ranges(np, hose->io_base_phys);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) /* Set the global ISA io base to indicate we have an ISA bridge */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) isa_io_base = ISA_IO_BASE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) pr_debug("ISA bridge (early) is %pOF\n", np);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) * isa_bridge_find_early - Find and map the ISA IO space early before
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) * main PCI discovery. This is optionally called by
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) * the arch code when adding PCI PHBs to get early
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) * access to ISA IO ports
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) void __init isa_bridge_init_non_pci(struct device_node *np)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) const __be32 *ranges, *pbasep = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) int rlen, i, rs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) u32 na, ns, pna;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) u64 cbase, pbase, size = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) /* If we already have an ISA bridge, bail off */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) if (isa_bridge_devnode != NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) pna = of_n_addr_cells(np);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) if (of_property_read_u32(np, "#address-cells", &na) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) of_property_read_u32(np, "#size-cells", &ns)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) pr_warn("ISA: Non-PCI bridge %pOF is missing address format\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) np);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) /* Check it's a supported address format */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) if (na != 2 || ns != 1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) pr_warn("ISA: Non-PCI bridge %pOF has unsupported address format\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) np);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) rs = na + ns + pna;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) /* Grab the ranges property */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) ranges = of_get_property(np, "ranges", &rlen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) if (ranges == NULL || rlen < rs) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) pr_warn("ISA: Non-PCI bridge %pOF has absent or invalid ranges\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) np);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) /* Parse it. We are only looking for IO space */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) for (i = 0; (i + rs - 1) < rlen; i += rs) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) if (be32_to_cpup(ranges + i) != 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) cbase = be32_to_cpup(ranges + i + 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) size = of_read_number(ranges + i + na + pna, ns);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) pbasep = ranges + i + na;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) /* Got something ? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) if (!size || !pbasep) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) pr_warn("ISA: Non-PCI bridge %pOF has no usable IO range\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) np);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) /* Align size and make sure it's cropped to 64K */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) size = PAGE_ALIGN(size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) if (size > 0x10000)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) size = 0x10000;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) /* Map pbase */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) pbase = of_translate_address(np, pbasep);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) if (pbase == OF_BAD_ADDR) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) pr_warn("ISA: Non-PCI bridge %pOF failed to translate IO base\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) np);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) /* We need page alignment */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) if ((cbase & ~PAGE_MASK) || (pbase & ~PAGE_MASK)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) pr_warn("ISA: Non-PCI bridge %pOF has non aligned IO range\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) np);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) /* Got it */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) isa_bridge_devnode = np;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) /* Set the global ISA io base to indicate we have an ISA bridge
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) * and map it
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) isa_io_base = ISA_IO_BASE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) remap_isa_base(pbase, size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) pr_debug("ISA: Non-PCI bridge is %pOF\n", np);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) * isa_bridge_find_late - Find and map the ISA IO space upon discovery of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) * a new ISA bridge
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) static void isa_bridge_find_late(struct pci_dev *pdev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) struct device_node *devnode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) struct pci_controller *hose = pci_bus_to_host(pdev->bus);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) /* Store ISA device node and PCI device */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) isa_bridge_devnode = of_node_get(devnode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) isa_bridge_pcidev = pdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) /* Now parse the "ranges" property and setup the ISA mapping */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) pci_process_ISA_OF_ranges(devnode, hose->io_base_phys);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) /* Set the global ISA io base to indicate we have an ISA bridge */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) isa_io_base = ISA_IO_BASE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) pr_debug("ISA bridge (late) is %pOF on %s\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) devnode, pci_name(pdev));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) * isa_bridge_remove - Remove/unmap an ISA bridge
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) static void isa_bridge_remove(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) pr_debug("ISA bridge removed !\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) /* Clear the global ISA io base to indicate that we have no more
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) * ISA bridge. Note that drivers don't quite handle that, though
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) * we should probably do something about it. But do we ever really
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) * have ISA bridges being removed on machines using legacy devices ?
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) isa_io_base = ISA_IO_BASE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) /* Clear references to the bridge */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) of_node_put(isa_bridge_devnode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) isa_bridge_devnode = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) isa_bridge_pcidev = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) /* Unmap the ISA area */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) unmap_kernel_range(ISA_IO_BASE, 0x10000);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) * isa_bridge_notify - Get notified of PCI devices addition/removal
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) static int isa_bridge_notify(struct notifier_block *nb, unsigned long action,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) void *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) struct device *dev = data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) struct pci_dev *pdev = to_pci_dev(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) struct device_node *devnode = pci_device_to_OF_node(pdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) switch(action) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) case BUS_NOTIFY_ADD_DEVICE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) /* Check if we have an early ISA device, without PCI dev */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) if (isa_bridge_devnode && isa_bridge_devnode == devnode &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) !isa_bridge_pcidev) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) pr_debug("ISA bridge PCI attached: %s\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) pci_name(pdev));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) isa_bridge_pcidev = pdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) /* Check if we have no ISA device, and this happens to be one,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) * register it as such if it has an OF device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) if (!isa_bridge_devnode && of_node_is_type(devnode, "isa"))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) isa_bridge_find_late(pdev, devnode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) case BUS_NOTIFY_DEL_DEVICE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) /* Check if this our existing ISA device */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) if (pdev == isa_bridge_pcidev ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) (devnode && devnode == isa_bridge_devnode))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) isa_bridge_remove();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) static struct notifier_block isa_bridge_notifier = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) .notifier_call = isa_bridge_notify
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) * isa_bridge_init - register to be notified of ISA bridge addition/removal
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) static int __init isa_bridge_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) bus_register_notifier(&pci_bus_type, &isa_bridge_notifier);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) arch_initcall(isa_bridge_init);
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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