/* * (c) Copyright 2006 Benjamin Herrenschmidt, IBM Corp. * <benh@kernel.crashing.org> * * 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 program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See * the GNU General Public License for more details. * * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #undef DEBUG #include <linux/kernel.h> #include <asm/prom.h> #include <asm/dcr.h> unsigned int dcr_resource_start(struct device_node *np, unsigned int index) { unsigned int ds; const u32 *dr = of_get_property(np, "dcr-reg", &ds); if (dr == NULL || ds & 1 || index >= (ds / 8)) return 0; return dr[index * 2]; } EXPORT_SYMBOL_GPL(dcr_resource_start); unsigned int dcr_resource_len(struct device_node *np, unsigned int index) { unsigned int ds; const u32 *dr = of_get_property(np, "dcr-reg", &ds); if (dr == NULL || ds & 1 || index >= (ds / 8)) return 0; return dr[index * 2 + 1]; } EXPORT_SYMBOL_GPL(dcr_resource_len); #ifndef CONFIG_PPC_DCR_NATIVE static struct device_node * find_dcr_parent(struct device_node * node) { struct device_node *par, *tmp; const u32 *p; for (par = of_node_get(node); par;) { if (of_get_property(par, "dcr-controller", NULL)) break; p = of_get_property(par, "dcr-parent", NULL); tmp = par; if (p == NULL) par = of_get_parent(par); else par = of_find_node_by_phandle(*p); of_node_put(tmp); } return par; } u64 of_translate_dcr_address(struct device_node *dev, unsigned int dcr_n, unsigned int *out_stride) { struct device_node *dp; const u32 *p; unsigned int stride; u64 ret; dp = find_dcr_parent(dev); if (dp == NULL) return OF_BAD_ADDR; /* Stride is not properly defined yet, default to 0x10 for Axon */ p = of_get_property(dp, "dcr-mmio-stride", NULL); stride = (p == NULL) ? 0x10 : *p; /* XXX FIXME: Which property name is to use of the 2 following ? */ p = of_get_property(dp, "dcr-mmio-range", NULL); if (p == NULL) p = of_get_property(dp, "dcr-mmio-space", NULL); if (p == NULL) return OF_BAD_ADDR; /* Maybe could do some better range checking here */ ret = of_translate_address(dp, p); if (ret != OF_BAD_ADDR) ret += (u64)(stride) * (u64)dcr_n; if (out_stride) *out_stride = stride; return ret; } dcr_host_t dcr_map(struct device_node *dev, unsigned int dcr_n, unsigned int dcr_c) { dcr_host_t ret = { .token = NULL, .stride = 0, .base = dcr_n }; u64 addr; pr_debug("dcr_map(%s, 0x%x, 0x%x)\n", dev->full_name, dcr_n, dcr_c); addr = of_translate_dcr_address(dev, dcr_n, &ret.stride); pr_debug("translates to addr: 0x%lx, stride: 0x%x\n", addr, ret.stride); if (addr == OF_BAD_ADDR) return ret; pr_debug("mapping 0x%x bytes\n", dcr_c * ret.stride); ret.token = ioremap(addr, dcr_c * ret.stride); if (ret.token == NULL) return ret; pr_debug("mapped at 0x%p -> base is 0x%p\n", ret.token, ret.token - dcr_n * ret.stride); ret.token -= dcr_n * ret.stride; return ret; } EXPORT_SYMBOL_GPL(dcr_map); void dcr_unmap(dcr_host_t host, unsigned int dcr_c) { dcr_host_t h = host; if (h.token == NULL) return; h.token += host.base * h.stride; iounmap(h.token); h.token = NULL; } EXPORT_SYMBOL_GPL(dcr_unmap); #endif /* !defined(CONFIG_PPC_DCR_NATIVE) */