+++ /dev/null
-/*
- * Memory arbiter functions. Allocates bandwidth through the
- * arbiter and sets up arbiter breakpoints.
- *
- * The algorithm first assigns slots to the clients that has specified
- * bandwidth (e.g. ethernet) and then the remaining slots are divided
- * on all the active clients.
- *
- * Copyright (c) 2004, 2005 Axis Communications AB.
- */
-
-#include <asm/arch/hwregs/reg_map.h>
-#include <asm/arch/hwregs/reg_rdwr.h>
-#include <asm/arch/hwregs/marb_defs.h>
-#include <asm/arch/arbiter.h>
-#include <asm/arch/hwregs/intr_vect.h>
-#include <linux/interrupt.h>
-#include <linux/signal.h>
-#include <linux/errno.h>
-#include <linux/spinlock.h>
-#include <asm/io.h>
-
-struct crisv32_watch_entry
-{
- unsigned long instance;
- watch_callback* cb;
- unsigned long start;
- unsigned long end;
- int used;
-};
-
-#define NUMBER_OF_BP 4
-#define NBR_OF_CLIENTS 14
-#define NBR_OF_SLOTS 64
-#define SDRAM_BANDWIDTH 100000000 /* Some kind of expected value */
-#define INTMEM_BANDWIDTH 400000000
-#define NBR_OF_REGIONS 2
-
-static struct crisv32_watch_entry watches[NUMBER_OF_BP] =
-{
- {regi_marb_bp0},
- {regi_marb_bp1},
- {regi_marb_bp2},
- {regi_marb_bp3}
-};
-
-static int requested_slots[NBR_OF_REGIONS][NBR_OF_CLIENTS];
-static int active_clients[NBR_OF_REGIONS][NBR_OF_CLIENTS];
-static int max_bandwidth[NBR_OF_REGIONS] = {SDRAM_BANDWIDTH, INTMEM_BANDWIDTH};
-
-DEFINE_SPINLOCK(arbiter_lock);
-
-static irqreturn_t
-crisv32_arbiter_irq(int irq, void* dev_id, struct pt_regs* regs);
-
-static void crisv32_arbiter_config(int region)
-{
- int slot;
- int client;
- int interval = 0;
- int val[NBR_OF_SLOTS];
-
- for (slot = 0; slot < NBR_OF_SLOTS; slot++)
- val[slot] = NBR_OF_CLIENTS + 1;
-
- for (client = 0; client < NBR_OF_CLIENTS; client++)
- {
- int pos;
- if (!requested_slots[region][client])
- continue;
- interval = NBR_OF_SLOTS / requested_slots[region][client];
- pos = 0;
- while (pos < NBR_OF_SLOTS)
- {
- if (val[pos] != NBR_OF_CLIENTS + 1)
- pos++;
- else
- {
- val[pos] = client;
- pos += interval;
- }
- }
- }
-
- client = 0;
- for (slot = 0; slot < NBR_OF_SLOTS; slot++)
- {
- if (val[slot] == NBR_OF_CLIENTS + 1)
- {
- int first = client;
- while(!active_clients[region][client]) {
- client = (client + 1) % NBR_OF_CLIENTS;
- if (client == first)
- break;
- }
- val[slot] = client;
- client = (client + 1) % NBR_OF_CLIENTS;
- }
- if (region == EXT_REGION)
- REG_WR_INT_VECT(marb, regi_marb, rw_ext_slots, slot, val[slot]);
- else if (region == INT_REGION)
- REG_WR_INT_VECT(marb, regi_marb, rw_int_slots, slot, val[slot]);
- }
-}
-
-extern char _stext, _etext;
-
-static void crisv32_arbiter_init(void)
-{
- static int initialized = 0;
-
- if (initialized)
- return;
-
- initialized = 1;
-
- /* CPU caches are active. */
- active_clients[EXT_REGION][10] = active_clients[EXT_REGION][11] = 1;
- crisv32_arbiter_config(EXT_REGION);
- crisv32_arbiter_config(INT_REGION);
-
- if (request_irq(MEMARB_INTR_VECT, crisv32_arbiter_irq, IRQF_DISABLED,
- "arbiter", NULL))
- printk(KERN_ERR "Couldn't allocate arbiter IRQ\n");
-
-#ifndef CONFIG_ETRAX_KGDB
- /* Global watch for writes to kernel text segment. */
- crisv32_arbiter_watch(virt_to_phys(&_stext), &_etext - &_stext,
- arbiter_all_clients, arbiter_all_write, NULL);
-#endif
-}
-
-
-
-int crisv32_arbiter_allocate_bandwidth(int client, int region,
- unsigned long bandwidth)
-{
- int i;
- int total_assigned = 0;
- int total_clients = 0;
- int req;
-
- crisv32_arbiter_init();
-
- for (i = 0; i < NBR_OF_CLIENTS; i++)
- {
- total_assigned += requested_slots[region][i];
- total_clients += active_clients[region][i];
- }
- req = NBR_OF_SLOTS / (max_bandwidth[region] / bandwidth);
-
- if (total_assigned + total_clients + req + 1 > NBR_OF_SLOTS)
- return -ENOMEM;
-
- active_clients[region][client] = 1;
- requested_slots[region][client] = req;
- crisv32_arbiter_config(region);
-
- return 0;
-}
-
-int crisv32_arbiter_watch(unsigned long start, unsigned long size,
- unsigned long clients, unsigned long accesses,
- watch_callback* cb)
-{
- int i;
-
- crisv32_arbiter_init();
-
- if (start > 0x80000000) {
- printk("Arbiter: %lX doesn't look like a physical address", start);
- return -EFAULT;
- }
-
- spin_lock(&arbiter_lock);
-
- for (i = 0; i < NUMBER_OF_BP; i++) {
- if (!watches[i].used) {
- reg_marb_rw_intr_mask intr_mask = REG_RD(marb, regi_marb, rw_intr_mask);
-
- watches[i].used = 1;
- watches[i].start = start;
- watches[i].end = start + size;
- watches[i].cb = cb;
-
- REG_WR_INT(marb_bp, watches[i].instance, rw_first_addr, watches[i].start);
- REG_WR_INT(marb_bp, watches[i].instance, rw_last_addr, watches[i].end);
- REG_WR_INT(marb_bp, watches[i].instance, rw_op, accesses);
- REG_WR_INT(marb_bp, watches[i].instance, rw_clients, clients);
-
- if (i == 0)
- intr_mask.bp0 = regk_marb_yes;
- else if (i == 1)
- intr_mask.bp1 = regk_marb_yes;
- else if (i == 2)
- intr_mask.bp2 = regk_marb_yes;
- else if (i == 3)
- intr_mask.bp3 = regk_marb_yes;
-
- REG_WR(marb, regi_marb, rw_intr_mask, intr_mask);
- spin_unlock(&arbiter_lock);
-
- return i;
- }
- }
- spin_unlock(&arbiter_lock);
- return -ENOMEM;
-}
-
-int crisv32_arbiter_unwatch(int id)
-{
- reg_marb_rw_intr_mask intr_mask = REG_RD(marb, regi_marb, rw_intr_mask);
-
- crisv32_arbiter_init();
-
- spin_lock(&arbiter_lock);
-
- if ((id < 0) || (id >= NUMBER_OF_BP) || (!watches[id].used)) {
- spin_unlock(&arbiter_lock);
- return -EINVAL;
- }
-
- memset(&watches[id], 0, sizeof(struct crisv32_watch_entry));
-
- if (id == 0)
- intr_mask.bp0 = regk_marb_no;
- else if (id == 1)
- intr_mask.bp2 = regk_marb_no;
- else if (id == 2)
- intr_mask.bp2 = regk_marb_no;
- else if (id == 3)
- intr_mask.bp3 = regk_marb_no;
-
- REG_WR(marb, regi_marb, rw_intr_mask, intr_mask);
-
- spin_unlock(&arbiter_lock);
- return 0;
-}
-
-extern void show_registers(struct pt_regs *regs);
-
-static irqreturn_t
-crisv32_arbiter_irq(int irq, void* dev_id, struct pt_regs* regs)
-{
- reg_marb_r_masked_intr masked_intr = REG_RD(marb, regi_marb, r_masked_intr);
- reg_marb_bp_r_brk_clients r_clients;
- reg_marb_bp_r_brk_addr r_addr;
- reg_marb_bp_r_brk_op r_op;
- reg_marb_bp_r_brk_first_client r_first;
- reg_marb_bp_r_brk_size r_size;
- reg_marb_bp_rw_ack ack = {0};
- reg_marb_rw_ack_intr ack_intr = {.bp0=1,.bp1=1,.bp2=1,.bp3=1};
- struct crisv32_watch_entry* watch;
-
- if (masked_intr.bp0) {
- watch = &watches[0];
- ack_intr.bp0 = regk_marb_yes;
- } else if (masked_intr.bp1) {
- watch = &watches[1];
- ack_intr.bp1 = regk_marb_yes;
- } else if (masked_intr.bp2) {
- watch = &watches[2];
- ack_intr.bp2 = regk_marb_yes;
- } else if (masked_intr.bp3) {
- watch = &watches[3];
- ack_intr.bp3 = regk_marb_yes;
- } else {
- return IRQ_NONE;
- }
-
- /* Retrieve all useful information and print it. */
- r_clients = REG_RD(marb_bp, watch->instance, r_brk_clients);
- r_addr = REG_RD(marb_bp, watch->instance, r_brk_addr);
- r_op = REG_RD(marb_bp, watch->instance, r_brk_op);
- r_first = REG_RD(marb_bp, watch->instance, r_brk_first_client);
- r_size = REG_RD(marb_bp, watch->instance, r_brk_size);
-
- printk("Arbiter IRQ\n");
- printk("Clients %X addr %X op %X first %X size %X\n",
- REG_TYPE_CONV(int, reg_marb_bp_r_brk_clients, r_clients),
- REG_TYPE_CONV(int, reg_marb_bp_r_brk_addr, r_addr),
- REG_TYPE_CONV(int, reg_marb_bp_r_brk_op, r_op),
- REG_TYPE_CONV(int, reg_marb_bp_r_brk_first_client, r_first),
- REG_TYPE_CONV(int, reg_marb_bp_r_brk_size, r_size));
-
- REG_WR(marb_bp, watch->instance, rw_ack, ack);
- REG_WR(marb, regi_marb, rw_ack_intr, ack_intr);
-
- printk("IRQ occured at %lX\n", regs->erp);
-
- if (watch->cb)
- watch->cb();
-
-
- return IRQ_HANDLED;
-}
git.openpandora.org / pandora-kernel.git / commitdiff