300 lines
6.9 KiB
C
300 lines
6.9 KiB
C
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* cbe_regs.c
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*
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* Accessor routines for the various MMIO register blocks of the CBE
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*
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* (c) 2006 Benjamin Herrenschmidt <benh@kernel.crashing.org>, IBM Corp.
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*/
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#include <linux/percpu.h>
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#include <linux/types.h>
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#include <linux/export.h>
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#include <linux/of_address.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/pgtable.h>
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#include <asm/io.h>
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#include <asm/ptrace.h>
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#include <asm/cell-regs.h>
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/*
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* Current implementation uses "cpu" nodes. We build our own mapping
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* array of cpu numbers to cpu nodes locally for now to allow interrupt
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* time code to have a fast path rather than call of_get_cpu_node(). If
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* we implement cpu hotplug, we'll have to install an appropriate notifier
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* in order to release references to the cpu going away
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*/
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static struct cbe_regs_map
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{
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struct device_node *cpu_node;
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struct device_node *be_node;
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struct cbe_pmd_regs __iomem *pmd_regs;
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struct cbe_iic_regs __iomem *iic_regs;
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struct cbe_mic_tm_regs __iomem *mic_tm_regs;
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struct cbe_pmd_shadow_regs pmd_shadow_regs;
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} cbe_regs_maps[MAX_CBE];
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static int cbe_regs_map_count;
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static struct cbe_thread_map
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{
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struct device_node *cpu_node;
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struct device_node *be_node;
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struct cbe_regs_map *regs;
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unsigned int thread_id;
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unsigned int cbe_id;
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} cbe_thread_map[NR_CPUS];
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static cpumask_t cbe_local_mask[MAX_CBE] = { [0 ... MAX_CBE-1] = {CPU_BITS_NONE} };
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static cpumask_t cbe_first_online_cpu = { CPU_BITS_NONE };
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static struct cbe_regs_map *cbe_find_map(struct device_node *np)
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{
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int i;
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struct device_node *tmp_np;
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if (!of_node_is_type(np, "spe")) {
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for (i = 0; i < cbe_regs_map_count; i++)
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if (cbe_regs_maps[i].cpu_node == np ||
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cbe_regs_maps[i].be_node == np)
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return &cbe_regs_maps[i];
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return NULL;
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}
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if (np->data)
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return np->data;
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/* walk up path until cpu or be node was found */
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tmp_np = np;
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do {
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tmp_np = tmp_np->parent;
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/* on a correct devicetree we wont get up to root */
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BUG_ON(!tmp_np);
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} while (!of_node_is_type(tmp_np, "cpu") ||
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!of_node_is_type(tmp_np, "be"));
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np->data = cbe_find_map(tmp_np);
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return np->data;
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}
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struct cbe_pmd_regs __iomem *cbe_get_pmd_regs(struct device_node *np)
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{
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struct cbe_regs_map *map = cbe_find_map(np);
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if (map == NULL)
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return NULL;
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return map->pmd_regs;
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}
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EXPORT_SYMBOL_GPL(cbe_get_pmd_regs);
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struct cbe_pmd_regs __iomem *cbe_get_cpu_pmd_regs(int cpu)
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{
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struct cbe_regs_map *map = cbe_thread_map[cpu].regs;
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if (map == NULL)
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return NULL;
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return map->pmd_regs;
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}
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EXPORT_SYMBOL_GPL(cbe_get_cpu_pmd_regs);
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struct cbe_pmd_shadow_regs *cbe_get_pmd_shadow_regs(struct device_node *np)
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{
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struct cbe_regs_map *map = cbe_find_map(np);
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if (map == NULL)
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return NULL;
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return &map->pmd_shadow_regs;
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}
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struct cbe_pmd_shadow_regs *cbe_get_cpu_pmd_shadow_regs(int cpu)
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{
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struct cbe_regs_map *map = cbe_thread_map[cpu].regs;
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if (map == NULL)
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return NULL;
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return &map->pmd_shadow_regs;
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}
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struct cbe_iic_regs __iomem *cbe_get_iic_regs(struct device_node *np)
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{
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struct cbe_regs_map *map = cbe_find_map(np);
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if (map == NULL)
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return NULL;
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return map->iic_regs;
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}
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struct cbe_iic_regs __iomem *cbe_get_cpu_iic_regs(int cpu)
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{
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struct cbe_regs_map *map = cbe_thread_map[cpu].regs;
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if (map == NULL)
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return NULL;
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return map->iic_regs;
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}
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struct cbe_mic_tm_regs __iomem *cbe_get_mic_tm_regs(struct device_node *np)
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{
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struct cbe_regs_map *map = cbe_find_map(np);
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if (map == NULL)
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return NULL;
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return map->mic_tm_regs;
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}
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struct cbe_mic_tm_regs __iomem *cbe_get_cpu_mic_tm_regs(int cpu)
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{
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struct cbe_regs_map *map = cbe_thread_map[cpu].regs;
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if (map == NULL)
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return NULL;
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return map->mic_tm_regs;
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}
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EXPORT_SYMBOL_GPL(cbe_get_cpu_mic_tm_regs);
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u32 cbe_get_hw_thread_id(int cpu)
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{
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return cbe_thread_map[cpu].thread_id;
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}
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EXPORT_SYMBOL_GPL(cbe_get_hw_thread_id);
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u32 cbe_cpu_to_node(int cpu)
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{
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return cbe_thread_map[cpu].cbe_id;
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}
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EXPORT_SYMBOL_GPL(cbe_cpu_to_node);
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u32 cbe_node_to_cpu(int node)
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{
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return cpumask_first(&cbe_local_mask[node]);
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}
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EXPORT_SYMBOL_GPL(cbe_node_to_cpu);
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static struct device_node *__init cbe_get_be_node(int cpu_id)
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{
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struct device_node *np;
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for_each_node_by_type (np, "be") {
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int len,i;
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const phandle *cpu_handle;
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cpu_handle = of_get_property(np, "cpus", &len);
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/*
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* the CAB SLOF tree is non compliant, so we just assume
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* there is only one node
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*/
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if (WARN_ON_ONCE(!cpu_handle))
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return np;
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for (i = 0; i < len; i++) {
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struct device_node *ch_np = of_find_node_by_phandle(cpu_handle[i]);
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struct device_node *ci_np = of_get_cpu_node(cpu_id, NULL);
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of_node_put(ch_np);
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of_node_put(ci_np);
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if (ch_np == ci_np)
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return np;
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}
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}
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return NULL;
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}
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static void __init cbe_fill_regs_map(struct cbe_regs_map *map)
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{
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if(map->be_node) {
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struct device_node *be, *np, *parent_np;
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be = map->be_node;
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for_each_node_by_type(np, "pervasive") {
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parent_np = of_get_parent(np);
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if (parent_np == be)
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map->pmd_regs = of_iomap(np, 0);
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of_node_put(parent_np);
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}
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for_each_node_by_type(np, "CBEA-Internal-Interrupt-Controller") {
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parent_np = of_get_parent(np);
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if (parent_np == be)
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map->iic_regs = of_iomap(np, 2);
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of_node_put(parent_np);
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}
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for_each_node_by_type(np, "mic-tm") {
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parent_np = of_get_parent(np);
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if (parent_np == be)
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map->mic_tm_regs = of_iomap(np, 0);
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of_node_put(parent_np);
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}
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} else {
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struct device_node *cpu;
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/* That hack must die die die ! */
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const struct address_prop {
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unsigned long address;
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unsigned int len;
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} __attribute__((packed)) *prop;
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cpu = map->cpu_node;
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prop = of_get_property(cpu, "pervasive", NULL);
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if (prop != NULL)
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map->pmd_regs = ioremap(prop->address, prop->len);
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prop = of_get_property(cpu, "iic", NULL);
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if (prop != NULL)
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map->iic_regs = ioremap(prop->address, prop->len);
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prop = of_get_property(cpu, "mic-tm", NULL);
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if (prop != NULL)
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map->mic_tm_regs = ioremap(prop->address, prop->len);
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}
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}
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void __init cbe_regs_init(void)
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{
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int i;
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unsigned int thread_id;
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struct device_node *cpu;
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/* Build local fast map of CPUs */
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for_each_possible_cpu(i) {
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cbe_thread_map[i].cpu_node = of_get_cpu_node(i, &thread_id);
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cbe_thread_map[i].be_node = cbe_get_be_node(i);
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cbe_thread_map[i].thread_id = thread_id;
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}
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/* Find maps for each device tree CPU */
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for_each_node_by_type(cpu, "cpu") {
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struct cbe_regs_map *map;
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unsigned int cbe_id;
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cbe_id = cbe_regs_map_count++;
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map = &cbe_regs_maps[cbe_id];
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if (cbe_regs_map_count > MAX_CBE) {
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printk(KERN_ERR "cbe_regs: More BE chips than supported"
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"!\n");
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cbe_regs_map_count--;
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of_node_put(cpu);
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return;
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}
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of_node_put(map->cpu_node);
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map->cpu_node = of_node_get(cpu);
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for_each_possible_cpu(i) {
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struct cbe_thread_map *thread = &cbe_thread_map[i];
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if (thread->cpu_node == cpu) {
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thread->regs = map;
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thread->cbe_id = cbe_id;
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map->be_node = thread->be_node;
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cpumask_set_cpu(i, &cbe_local_mask[cbe_id]);
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if(thread->thread_id == 0)
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cpumask_set_cpu(i, &cbe_first_online_cpu);
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}
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}
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cbe_fill_regs_map(map);
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}
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}
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