From 4670d610d59233b017a6ea1fa25bbf06dabbff42 Mon Sep 17 00:00:00 2001 From: Rob Herring Date: Wed, 17 Jan 2018 17:36:39 -0600 Subject: PCI: Move OF-related PCI functions into PCI core Following what has been done for other subsystems, move the remaining PCI related code out of drivers/of/ and into drivers/pci/of.c With this, we can kill a few kconfig symbols. Signed-off-by: Rob Herring [bhelgaas: minor whitespace, comment cleanups] Signed-off-by: Bjorn Helgaas Cc: Frank Rowand --- drivers/of/of_pci.c | 384 ---------------------------------------------------- 1 file changed, 384 deletions(-) delete mode 100644 drivers/of/of_pci.c (limited to 'drivers/of/of_pci.c') diff --git a/drivers/of/of_pci.c b/drivers/of/of_pci.c deleted file mode 100644 index a7b1cb6c2f65..000000000000 --- a/drivers/of/of_pci.c +++ /dev/null @@ -1,384 +0,0 @@ -#define pr_fmt(fmt) "OF: PCI: " fmt - -#include -#include -#include -#include -#include -#include -#include - -static inline int __of_pci_pci_compare(struct device_node *node, - unsigned int data) -{ - int devfn; - - devfn = of_pci_get_devfn(node); - if (devfn < 0) - return 0; - - return devfn == data; -} - -struct device_node *of_pci_find_child_device(struct device_node *parent, - unsigned int devfn) -{ - struct device_node *node, *node2; - - for_each_child_of_node(parent, node) { - if (__of_pci_pci_compare(node, devfn)) - return node; - /* - * Some OFs create a parent node "multifunc-device" as - * a fake root for all functions of a multi-function - * device we go down them as well. - */ - if (!strcmp(node->name, "multifunc-device")) { - for_each_child_of_node(node, node2) { - if (__of_pci_pci_compare(node2, devfn)) { - of_node_put(node); - return node2; - } - } - } - } - return NULL; -} -EXPORT_SYMBOL_GPL(of_pci_find_child_device); - -/** - * of_pci_get_devfn() - Get device and function numbers for a device node - * @np: device node - * - * Parses a standard 5-cell PCI resource and returns an 8-bit value that can - * be passed to the PCI_SLOT() and PCI_FUNC() macros to extract the device - * and function numbers respectively. On error a negative error code is - * returned. - */ -int of_pci_get_devfn(struct device_node *np) -{ - u32 reg[5]; - int error; - - error = of_property_read_u32_array(np, "reg", reg, ARRAY_SIZE(reg)); - if (error) - return error; - - return (reg[0] >> 8) & 0xff; -} -EXPORT_SYMBOL_GPL(of_pci_get_devfn); - -/** - * of_pci_parse_bus_range() - parse the bus-range property of a PCI device - * @node: device node - * @res: address to a struct resource to return the bus-range - * - * Returns 0 on success or a negative error-code on failure. - */ -int of_pci_parse_bus_range(struct device_node *node, struct resource *res) -{ - u32 bus_range[2]; - int error; - - error = of_property_read_u32_array(node, "bus-range", bus_range, - ARRAY_SIZE(bus_range)); - if (error) - return error; - - res->name = node->name; - res->start = bus_range[0]; - res->end = bus_range[1]; - res->flags = IORESOURCE_BUS; - - return 0; -} -EXPORT_SYMBOL_GPL(of_pci_parse_bus_range); - -/** - * This function will try to obtain the host bridge domain number by - * finding a property called "linux,pci-domain" of the given device node. - * - * @node: device tree node with the domain information - * - * Returns the associated domain number from DT in the range [0-0xffff], or - * a negative value if the required property is not found. - */ -int of_get_pci_domain_nr(struct device_node *node) -{ - u32 domain; - int error; - - error = of_property_read_u32(node, "linux,pci-domain", &domain); - if (error) - return error; - - return (u16)domain; -} -EXPORT_SYMBOL_GPL(of_get_pci_domain_nr); - -/** - * This function will try to find the limitation of link speed by finding - * a property called "max-link-speed" of the given device node. - * - * @node: device tree node with the max link speed information - * - * Returns the associated max link speed from DT, or a negative value if the - * required property is not found or is invalid. - */ -int of_pci_get_max_link_speed(struct device_node *node) -{ - u32 max_link_speed; - - if (of_property_read_u32(node, "max-link-speed", &max_link_speed) || - max_link_speed > 4) - return -EINVAL; - - return max_link_speed; -} -EXPORT_SYMBOL_GPL(of_pci_get_max_link_speed); - -/** - * of_pci_check_probe_only - Setup probe only mode if linux,pci-probe-only - * is present and valid - */ -void of_pci_check_probe_only(void) -{ - u32 val; - int ret; - - ret = of_property_read_u32(of_chosen, "linux,pci-probe-only", &val); - if (ret) { - if (ret == -ENODATA || ret == -EOVERFLOW) - pr_warn("linux,pci-probe-only without valid value, ignoring\n"); - return; - } - - if (val) - pci_add_flags(PCI_PROBE_ONLY); - else - pci_clear_flags(PCI_PROBE_ONLY); - - pr_info("PROBE_ONLY %sabled\n", val ? "en" : "dis"); -} -EXPORT_SYMBOL_GPL(of_pci_check_probe_only); - -#if defined(CONFIG_OF_ADDRESS) -/** - * of_pci_get_host_bridge_resources - Parse PCI host bridge resources from DT - * @dev: device node of the host bridge having the range property - * @busno: bus number associated with the bridge root bus - * @bus_max: maximum number of buses for this bridge - * @resources: list where the range of resources will be added after DT parsing - * @io_base: pointer to a variable that will contain on return the physical - * address for the start of the I/O range. Can be NULL if the caller doesn't - * expect IO ranges to be present in the device tree. - * - * It is the caller's job to free the @resources list. - * - * This function will parse the "ranges" property of a PCI host bridge device - * node and setup the resource mapping based on its content. It is expected - * that the property conforms with the Power ePAPR document. - * - * It returns zero if the range parsing has been successful or a standard error - * value if it failed. - */ -int of_pci_get_host_bridge_resources(struct device_node *dev, - unsigned char busno, unsigned char bus_max, - struct list_head *resources, resource_size_t *io_base) -{ - struct resource_entry *window; - struct resource *res; - struct resource *bus_range; - struct of_pci_range range; - struct of_pci_range_parser parser; - char range_type[4]; - int err; - - if (io_base) - *io_base = (resource_size_t)OF_BAD_ADDR; - - bus_range = kzalloc(sizeof(*bus_range), GFP_KERNEL); - if (!bus_range) - return -ENOMEM; - - pr_info("host bridge %pOF ranges:\n", dev); - - err = of_pci_parse_bus_range(dev, bus_range); - if (err) { - bus_range->start = busno; - bus_range->end = bus_max; - bus_range->flags = IORESOURCE_BUS; - pr_info(" No bus range found for %pOF, using %pR\n", - dev, bus_range); - } else { - if (bus_range->end > bus_range->start + bus_max) - bus_range->end = bus_range->start + bus_max; - } - pci_add_resource(resources, bus_range); - - /* Check for ranges property */ - err = of_pci_range_parser_init(&parser, dev); - if (err) - goto parse_failed; - - pr_debug("Parsing ranges property...\n"); - for_each_of_pci_range(&parser, &range) { - /* Read next ranges element */ - if ((range.flags & IORESOURCE_TYPE_BITS) == IORESOURCE_IO) - snprintf(range_type, 4, " IO"); - else if ((range.flags & IORESOURCE_TYPE_BITS) == IORESOURCE_MEM) - snprintf(range_type, 4, "MEM"); - else - snprintf(range_type, 4, "err"); - pr_info(" %s %#010llx..%#010llx -> %#010llx\n", range_type, - range.cpu_addr, range.cpu_addr + range.size - 1, - range.pci_addr); - - /* - * If we failed translation or got a zero-sized region - * then skip this range - */ - if (range.cpu_addr == OF_BAD_ADDR || range.size == 0) - continue; - - res = kzalloc(sizeof(struct resource), GFP_KERNEL); - if (!res) { - err = -ENOMEM; - goto parse_failed; - } - - err = of_pci_range_to_resource(&range, dev, res); - if (err) { - kfree(res); - continue; - } - - if (resource_type(res) == IORESOURCE_IO) { - if (!io_base) { - pr_err("I/O range found for %pOF. Please provide an io_base pointer to save CPU base address\n", - dev); - err = -EINVAL; - goto conversion_failed; - } - if (*io_base != (resource_size_t)OF_BAD_ADDR) - pr_warn("More than one I/O resource converted for %pOF. CPU base address for old range lost!\n", - dev); - *io_base = range.cpu_addr; - } - - pci_add_resource_offset(resources, res, res->start - range.pci_addr); - } - - return 0; - -conversion_failed: - kfree(res); -parse_failed: - resource_list_for_each_entry(window, resources) - kfree(window->res); - pci_free_resource_list(resources); - return err; -} -EXPORT_SYMBOL_GPL(of_pci_get_host_bridge_resources); -#endif /* CONFIG_OF_ADDRESS */ - -/** - * of_pci_map_rid - Translate a requester ID through a downstream mapping. - * @np: root complex device node. - * @rid: PCI requester ID to map. - * @map_name: property name of the map to use. - * @map_mask_name: optional property name of the mask to use. - * @target: optional pointer to a target device node. - * @id_out: optional pointer to receive the translated ID. - * - * Given a PCI requester ID, look up the appropriate implementation-defined - * platform ID and/or the target device which receives transactions on that - * ID, as per the "iommu-map" and "msi-map" bindings. Either of @target or - * @id_out may be NULL if only the other is required. If @target points to - * a non-NULL device node pointer, only entries targeting that node will be - * matched; if it points to a NULL value, it will receive the device node of - * the first matching target phandle, with a reference held. - * - * Return: 0 on success or a standard error code on failure. - */ -int of_pci_map_rid(struct device_node *np, u32 rid, - const char *map_name, const char *map_mask_name, - struct device_node **target, u32 *id_out) -{ - u32 map_mask, masked_rid; - int map_len; - const __be32 *map = NULL; - - if (!np || !map_name || (!target && !id_out)) - return -EINVAL; - - map = of_get_property(np, map_name, &map_len); - if (!map) { - if (target) - return -ENODEV; - /* Otherwise, no map implies no translation */ - *id_out = rid; - return 0; - } - - if (!map_len || map_len % (4 * sizeof(*map))) { - pr_err("%pOF: Error: Bad %s length: %d\n", np, - map_name, map_len); - return -EINVAL; - } - - /* The default is to select all bits. */ - map_mask = 0xffffffff; - - /* - * Can be overridden by "{iommu,msi}-map-mask" property. - * If of_property_read_u32() fails, the default is used. - */ - if (map_mask_name) - of_property_read_u32(np, map_mask_name, &map_mask); - - masked_rid = map_mask & rid; - for ( ; map_len > 0; map_len -= 4 * sizeof(*map), map += 4) { - struct device_node *phandle_node; - u32 rid_base = be32_to_cpup(map + 0); - u32 phandle = be32_to_cpup(map + 1); - u32 out_base = be32_to_cpup(map + 2); - u32 rid_len = be32_to_cpup(map + 3); - - if (rid_base & ~map_mask) { - pr_err("%pOF: Invalid %s translation - %s-mask (0x%x) ignores rid-base (0x%x)\n", - np, map_name, map_name, - map_mask, rid_base); - return -EFAULT; - } - - if (masked_rid < rid_base || masked_rid >= rid_base + rid_len) - continue; - - phandle_node = of_find_node_by_phandle(phandle); - if (!phandle_node) - return -ENODEV; - - if (target) { - if (*target) - of_node_put(phandle_node); - else - *target = phandle_node; - - if (*target != phandle_node) - continue; - } - - if (id_out) - *id_out = masked_rid - rid_base + out_base; - - pr_debug("%pOF: %s, using mask %08x, rid-base: %08x, out-base: %08x, length: %08x, rid: %08x -> %08x\n", - np, map_name, map_mask, rid_base, out_base, - rid_len, rid, masked_rid - rid_base + out_base); - return 0; - } - - pr_err("%pOF: Invalid %s translation - no match for rid 0x%x on %pOF\n", - np, map_name, rid, target && *target ? *target : NULL); - return -EFAULT; -} -- cgit