1/*
  2 * MSP71xx Platform-specific hooks for SMP operation
  3 */
  4#include <linux/irq.h>
  5#include <linux/init.h>
  6
  7#include <asm/mipsmtregs.h>
  8#include <asm/mipsregs.h>
  9#include <asm/smtc.h>
 10#include <asm/smtc_ipi.h>
 11
 12/* VPE/SMP Prototype implements platform interfaces directly */
 13
 14/*
 15 * Cause the specified action to be performed on a targeted "CPU"
 16 */
 17
 18static void msp_smtc_send_ipi_single(int cpu, unsigned int action)
 19{
 20	/* "CPU" may be TC of same VPE, VPE of same CPU, or different CPU */
 21	smtc_send_ipi(cpu, LINUX_SMP_IPI, action);
 22}
 23
 24static void msp_smtc_send_ipi_mask(const struct cpumask *mask,
 25						unsigned int action)
 26{
 27	unsigned int i;
 28
 29	for_each_cpu(i, mask)
 30		msp_smtc_send_ipi_single(i, action);
 31}
 32
 33/*
 34 * Post-config but pre-boot cleanup entry point
 35 */
 36static void msp_smtc_init_secondary(void)
 37{
 38	int myvpe;
 39
 40	/* Don't enable Malta I/O interrupts (IP2) for secondary VPEs */
 41	myvpe = read_c0_tcbind() & TCBIND_CURVPE;
 42	if (myvpe > 0)
 43		change_c0_status(ST0_IM, STATUSF_IP0 | STATUSF_IP1 |
 44				STATUSF_IP6 | STATUSF_IP7);
 45	smtc_init_secondary();
 46}
 47
 48/*
 49 * Platform "CPU" startup hook
 50 */
 51static void msp_smtc_boot_secondary(int cpu, struct task_struct *idle)
 52{
 53	smtc_boot_secondary(cpu, idle);
 54}
 55
 56/*
 57 * SMP initialization finalization entry point
 58 */
 59static void msp_smtc_smp_finish(void)
 60{
 61	smtc_smp_finish();
 62}
 63
 64/*
 65 * Hook for after all CPUs are online
 66 */
 67
 68static void msp_smtc_cpus_done(void)
 69{
 70}
 71
 72/*
 73 * Platform SMP pre-initialization
 74 *
 75 * As noted above, we can assume a single CPU for now
 76 * but it may be multithreaded.
 77 */
 78
 79static void __init msp_smtc_smp_setup(void)
 80{
 81	/*
 82	 * we won't get the definitive value until
 83	 * we've run smtc_prepare_cpus later, but
 84	 */
 85
 86	if (read_c0_config3() & (1 << 2))
 87		smp_num_siblings = smtc_build_cpu_map(0);
 88}
 89
 90static void __init msp_smtc_prepare_cpus(unsigned int max_cpus)
 91{
 92	smtc_prepare_cpus(max_cpus);
 93}
 94
 95struct plat_smp_ops msp_smtc_smp_ops = {
 96	.send_ipi_single	= msp_smtc_send_ipi_single,
 97	.send_ipi_mask		= msp_smtc_send_ipi_mask,
 98	.init_secondary		= msp_smtc_init_secondary,
 99	.smp_finish		= msp_smtc_smp_finish,
100	.cpus_done		= msp_smtc_cpus_done,
101	.boot_secondary		= msp_smtc_boot_secondary,
102	.smp_setup		= msp_smtc_smp_setup,
103	.prepare_cpus		= msp_smtc_prepare_cpus,
104};