diff options
Diffstat (limited to 'arch/x86/kernel/mrst.c')
| -rw-r--r-- | arch/x86/kernel/mrst.c | 110 |
1 files changed, 110 insertions, 0 deletions
diff --git a/arch/x86/kernel/mrst.c b/arch/x86/kernel/mrst.c index 98440e18919..bb6e45c71dd 100644 --- a/arch/x86/kernel/mrst.c +++ b/arch/x86/kernel/mrst.c @@ -10,12 +10,122 @@ * of the License. */ #include <linux/init.h> +#include <linux/kernel.h> +#include <linux/sfi.h> +#include <linux/irq.h> #include <asm/setup.h> +#include <asm/mpspec_def.h> +#include <asm/hw_irq.h> +#include <asm/apic.h> +#include <asm/io_apic.h> #include <asm/mrst.h> #include <asm/io.h> #include <asm/i8259.h> +static u32 sfi_mtimer_usage[SFI_MTMR_MAX_NUM]; +static struct sfi_timer_table_entry sfi_mtimer_array[SFI_MTMR_MAX_NUM]; +int sfi_mtimer_num; + +static inline void assign_to_mp_irq(struct mpc_intsrc *m, + struct mpc_intsrc *mp_irq) +{ + memcpy(mp_irq, m, sizeof(struct mpc_intsrc)); +} + +static inline int mp_irq_cmp(struct mpc_intsrc *mp_irq, + struct mpc_intsrc *m) +{ + return memcmp(mp_irq, m, sizeof(struct mpc_intsrc)); +} + +static void save_mp_irq(struct mpc_intsrc *m) +{ + int i; + + for (i = 0; i < mp_irq_entries; i++) { + if (!mp_irq_cmp(&mp_irqs[i], m)) + return; + } + + assign_to_mp_irq(m, &mp_irqs[mp_irq_entries]); + if (++mp_irq_entries == MAX_IRQ_SOURCES) + panic("Max # of irq sources exceeded!!\n"); +} + +/* parse all the mtimer info to a static mtimer array */ +static int __init sfi_parse_mtmr(struct sfi_table_header *table) +{ + struct sfi_table_simple *sb; + struct sfi_timer_table_entry *pentry; + struct mpc_intsrc mp_irq; + int totallen; + + sb = (struct sfi_table_simple *)table; + if (!sfi_mtimer_num) { + sfi_mtimer_num = SFI_GET_NUM_ENTRIES(sb, + struct sfi_timer_table_entry); + pentry = (struct sfi_timer_table_entry *) sb->pentry; + totallen = sfi_mtimer_num * sizeof(*pentry); + memcpy(sfi_mtimer_array, pentry, totallen); + } + + printk(KERN_INFO "SFI: MTIMER info (num = %d):\n", sfi_mtimer_num); + pentry = sfi_mtimer_array; + for (totallen = 0; totallen < sfi_mtimer_num; totallen++, pentry++) { + printk(KERN_INFO "timer[%d]: paddr = 0x%08x, freq = %dHz," + " irq = %d\n", totallen, (u32)pentry->phys_addr, + pentry->freq_hz, pentry->irq); + if (!pentry->irq) + continue; + mp_irq.type = MP_IOAPIC; + mp_irq.irqtype = mp_INT; +/* triggering mode edge bit 2-3, active high polarity bit 0-1 */ + mp_irq.irqflag = 5; + mp_irq.srcbus = 0; + mp_irq.srcbusirq = pentry->irq; /* IRQ */ + mp_irq.dstapic = MP_APIC_ALL; + mp_irq.dstirq = pentry->irq; + save_mp_irq(&mp_irq); + } + + return 0; +} + +struct sfi_timer_table_entry *sfi_get_mtmr(int hint) +{ + int i; + if (hint < sfi_mtimer_num) { + if (!sfi_mtimer_usage[hint]) { + pr_debug("hint taken for timer %d irq %d\n",\ + hint, sfi_mtimer_array[hint].irq); + sfi_mtimer_usage[hint] = 1; + return &sfi_mtimer_array[hint]; + } + } + /* take the first timer available */ + for (i = 0; i < sfi_mtimer_num;) { + if (!sfi_mtimer_usage[i]) { + sfi_mtimer_usage[i] = 1; + return &sfi_mtimer_array[i]; + } + i++; + } + return NULL; +} + +void sfi_free_mtmr(struct sfi_timer_table_entry *mtmr) +{ + int i; + for (i = 0; i < sfi_mtimer_num;) { + if (mtmr->irq == sfi_mtimer_array[i].irq) { + sfi_mtimer_usage[i] = 0; + return; + } + i++; + } +} + /* * Moorestown specific x86_init function overrides and early setup * calls. |