435 lines
9.0 KiB
C
435 lines
9.0 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/string.h>
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#include <linux/kernel.h>
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#include <linux/of.h>
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#include <linux/init.h>
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#include <linux/mod_devicetable.h>
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#include <linux/slab.h>
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#include <linux/errno.h>
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#include <linux/irq.h>
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#include <linux/of_device.h>
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#include <linux/of_platform.h>
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#include <linux/dma-mapping.h>
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#include <asm/leon.h>
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#include <asm/leon_amba.h>
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#include "of_device_common.h"
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#include "irq.h"
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/*
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* PCI bus specific translator
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*/
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static int of_bus_pci_match(struct device_node *np)
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{
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if (!strcmp(np->type, "pci") || !strcmp(np->type, "pciex")) {
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/* Do not do PCI specific frobbing if the
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* PCI bridge lacks a ranges property. We
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* want to pass it through up to the next
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* parent as-is, not with the PCI translate
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* method which chops off the top address cell.
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*/
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if (!of_find_property(np, "ranges", NULL))
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return 0;
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return 1;
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}
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return 0;
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}
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static void of_bus_pci_count_cells(struct device_node *np,
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int *addrc, int *sizec)
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{
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if (addrc)
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*addrc = 3;
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if (sizec)
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*sizec = 2;
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}
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static int of_bus_pci_map(u32 *addr, const u32 *range,
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int na, int ns, int pna)
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{
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u32 result[OF_MAX_ADDR_CELLS];
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int i;
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/* Check address type match */
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if ((addr[0] ^ range[0]) & 0x03000000)
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return -EINVAL;
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if (of_out_of_range(addr + 1, range + 1, range + na + pna,
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na - 1, ns))
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return -EINVAL;
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/* Start with the parent range base. */
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memcpy(result, range + na, pna * 4);
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/* Add in the child address offset, skipping high cell. */
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for (i = 0; i < na - 1; i++)
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result[pna - 1 - i] +=
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(addr[na - 1 - i] -
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range[na - 1 - i]);
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memcpy(addr, result, pna * 4);
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return 0;
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}
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static unsigned long of_bus_pci_get_flags(const u32 *addr, unsigned long flags)
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{
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u32 w = addr[0];
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/* For PCI, we override whatever child busses may have used. */
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flags = 0;
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switch((w >> 24) & 0x03) {
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case 0x01:
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flags |= IORESOURCE_IO;
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break;
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case 0x02: /* 32 bits */
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case 0x03: /* 64 bits */
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flags |= IORESOURCE_MEM;
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break;
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}
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if (w & 0x40000000)
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flags |= IORESOURCE_PREFETCH;
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return flags;
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}
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static unsigned long of_bus_sbus_get_flags(const u32 *addr, unsigned long flags)
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{
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return IORESOURCE_MEM;
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}
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/*
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* AMBAPP bus specific translator
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*/
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static int of_bus_ambapp_match(struct device_node *np)
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{
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return !strcmp(np->type, "ambapp");
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}
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static void of_bus_ambapp_count_cells(struct device_node *child,
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int *addrc, int *sizec)
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{
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if (addrc)
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*addrc = 1;
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if (sizec)
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*sizec = 1;
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}
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static int of_bus_ambapp_map(u32 *addr, const u32 *range,
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int na, int ns, int pna)
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{
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return of_bus_default_map(addr, range, na, ns, pna);
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}
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static unsigned long of_bus_ambapp_get_flags(const u32 *addr,
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unsigned long flags)
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{
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return IORESOURCE_MEM;
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}
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/*
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* Array of bus specific translators
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*/
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static struct of_bus of_busses[] = {
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/* PCI */
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{
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.name = "pci",
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.addr_prop_name = "assigned-addresses",
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.match = of_bus_pci_match,
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.count_cells = of_bus_pci_count_cells,
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.map = of_bus_pci_map,
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.get_flags = of_bus_pci_get_flags,
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},
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/* SBUS */
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{
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.name = "sbus",
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.addr_prop_name = "reg",
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.match = of_bus_sbus_match,
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.count_cells = of_bus_sbus_count_cells,
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.map = of_bus_default_map,
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.get_flags = of_bus_sbus_get_flags,
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},
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/* AMBA */
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{
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.name = "ambapp",
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.addr_prop_name = "reg",
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.match = of_bus_ambapp_match,
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.count_cells = of_bus_ambapp_count_cells,
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.map = of_bus_ambapp_map,
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.get_flags = of_bus_ambapp_get_flags,
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},
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/* Default */
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{
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.name = "default",
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.addr_prop_name = "reg",
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.match = NULL,
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.count_cells = of_bus_default_count_cells,
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.map = of_bus_default_map,
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.get_flags = of_bus_default_get_flags,
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},
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};
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static struct of_bus *of_match_bus(struct device_node *np)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(of_busses); i ++)
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if (!of_busses[i].match || of_busses[i].match(np))
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return &of_busses[i];
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BUG();
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return NULL;
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}
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static int __init build_one_resource(struct device_node *parent,
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struct of_bus *bus,
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struct of_bus *pbus,
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u32 *addr,
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int na, int ns, int pna)
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{
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const u32 *ranges;
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unsigned int rlen;
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int rone;
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ranges = of_get_property(parent, "ranges", &rlen);
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if (ranges == NULL || rlen == 0) {
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u32 result[OF_MAX_ADDR_CELLS];
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int i;
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memset(result, 0, pna * 4);
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for (i = 0; i < na; i++)
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result[pna - 1 - i] =
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addr[na - 1 - i];
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memcpy(addr, result, pna * 4);
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return 0;
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}
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/* Now walk through the ranges */
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rlen /= 4;
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rone = na + pna + ns;
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for (; rlen >= rone; rlen -= rone, ranges += rone) {
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if (!bus->map(addr, ranges, na, ns, pna))
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return 0;
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}
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return 1;
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}
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static int __init use_1to1_mapping(struct device_node *pp)
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{
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/* If we have a ranges property in the parent, use it. */
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if (of_find_property(pp, "ranges", NULL) != NULL)
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return 0;
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/* Some SBUS devices use intermediate nodes to express
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* hierarchy within the device itself. These aren't
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* real bus nodes, and don't have a 'ranges' property.
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* But, we should still pass the translation work up
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* to the SBUS itself.
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*/
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if (!strcmp(pp->name, "dma") ||
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!strcmp(pp->name, "espdma") ||
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!strcmp(pp->name, "ledma") ||
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!strcmp(pp->name, "lebuffer"))
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return 0;
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return 1;
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}
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static int of_resource_verbose;
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static void __init build_device_resources(struct platform_device *op,
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struct device *parent)
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{
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struct platform_device *p_op;
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struct of_bus *bus;
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int na, ns;
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int index, num_reg;
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const void *preg;
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if (!parent)
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return;
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p_op = to_platform_device(parent);
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bus = of_match_bus(p_op->dev.of_node);
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bus->count_cells(op->dev.of_node, &na, &ns);
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preg = of_get_property(op->dev.of_node, bus->addr_prop_name, &num_reg);
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if (!preg || num_reg == 0)
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return;
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/* Convert to num-cells. */
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num_reg /= 4;
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/* Conver to num-entries. */
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num_reg /= na + ns;
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op->resource = op->archdata.resource;
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op->num_resources = num_reg;
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for (index = 0; index < num_reg; index++) {
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struct resource *r = &op->resource[index];
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u32 addr[OF_MAX_ADDR_CELLS];
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const u32 *reg = (preg + (index * ((na + ns) * 4)));
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struct device_node *dp = op->dev.of_node;
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struct device_node *pp = p_op->dev.of_node;
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struct of_bus *pbus, *dbus;
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u64 size, result = OF_BAD_ADDR;
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unsigned long flags;
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int dna, dns;
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int pna, pns;
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size = of_read_addr(reg + na, ns);
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memcpy(addr, reg, na * 4);
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flags = bus->get_flags(reg, 0);
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if (use_1to1_mapping(pp)) {
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result = of_read_addr(addr, na);
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goto build_res;
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}
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dna = na;
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dns = ns;
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dbus = bus;
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while (1) {
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dp = pp;
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pp = dp->parent;
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if (!pp) {
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result = of_read_addr(addr, dna);
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break;
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}
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pbus = of_match_bus(pp);
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pbus->count_cells(dp, &pna, &pns);
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if (build_one_resource(dp, dbus, pbus, addr,
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dna, dns, pna))
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break;
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flags = pbus->get_flags(addr, flags);
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dna = pna;
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dns = pns;
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dbus = pbus;
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}
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build_res:
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memset(r, 0, sizeof(*r));
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if (of_resource_verbose)
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printk("%s reg[%d] -> %llx\n",
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op->dev.of_node->full_name, index,
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result);
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if (result != OF_BAD_ADDR) {
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r->start = result & 0xffffffff;
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r->end = result + size - 1;
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r->flags = flags | ((result >> 32ULL) & 0xffUL);
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}
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r->name = op->dev.of_node->name;
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}
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}
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static struct platform_device * __init scan_one_device(struct device_node *dp,
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struct device *parent)
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{
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struct platform_device *op = kzalloc(sizeof(*op), GFP_KERNEL);
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const struct linux_prom_irqs *intr;
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struct dev_archdata *sd;
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int len, i;
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if (!op)
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return NULL;
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sd = &op->dev.archdata;
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sd->op = op;
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op->dev.of_node = dp;
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intr = of_get_property(dp, "intr", &len);
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if (intr) {
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op->archdata.num_irqs = len / sizeof(struct linux_prom_irqs);
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for (i = 0; i < op->archdata.num_irqs; i++)
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op->archdata.irqs[i] =
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sparc_config.build_device_irq(op, intr[i].pri);
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} else {
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const unsigned int *irq =
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of_get_property(dp, "interrupts", &len);
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if (irq) {
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op->archdata.num_irqs = len / sizeof(unsigned int);
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for (i = 0; i < op->archdata.num_irqs; i++)
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op->archdata.irqs[i] =
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sparc_config.build_device_irq(op, irq[i]);
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} else {
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op->archdata.num_irqs = 0;
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}
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}
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build_device_resources(op, parent);
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op->dev.parent = parent;
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op->dev.bus = &platform_bus_type;
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if (!parent)
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dev_set_name(&op->dev, "root");
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else
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dev_set_name(&op->dev, "%08x", dp->phandle);
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op->dev.coherent_dma_mask = DMA_BIT_MASK(32);
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op->dev.dma_mask = &op->dev.coherent_dma_mask;
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if (of_device_register(op)) {
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printk("%s: Could not register of device.\n",
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dp->full_name);
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kfree(op);
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op = NULL;
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}
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return op;
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}
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static void __init scan_tree(struct device_node *dp, struct device *parent)
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{
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while (dp) {
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struct platform_device *op = scan_one_device(dp, parent);
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if (op)
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scan_tree(dp->child, &op->dev);
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dp = dp->sibling;
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}
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}
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static int __init scan_of_devices(void)
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{
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struct device_node *root = of_find_node_by_path("/");
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struct platform_device *parent;
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parent = scan_one_device(root, NULL);
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if (!parent)
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return 0;
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scan_tree(root->child, &parent->dev);
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return 0;
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}
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postcore_initcall(scan_of_devices);
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static int __init of_debug(char *str)
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{
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int val = 0;
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get_option(&str, &val);
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if (val & 1)
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of_resource_verbose = 1;
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return 1;
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}
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__setup("of_debug=", of_debug);
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