x86, mrst: Add platform timer info parsing code

Moorestown platform timer information is obtained from SFI FW tables.
This patch parses SFI table then assign the irq information to mp_irqs.

Signed-off-by: Jacob Pan <jacob.jun.pan@intel.com>
LKML-Reference: <43F901BD926A4E43B106BF17856F07559FB80D0B@orsmsx508.amr.corp.intel.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>

2 files changed, 112 insertions, 0 deletions

diff --git a/arch/x86/include/asm/mrst.h b/arch/x86/include/asm/mrst.h
index 57a177a8e823..fa144f2dd256 100644
--- a/arch/x86/include/asm/mrst.h
+++ b/arch/x86/include/asm/mrst.h
@@ -12,4 +12,6 @@
 #define _ASM_X86_MRST_H
 extern int pci_mrst_init(void);
 
+#define SFI_MTMR_MAX_NUM 8
+
 #endif /* _ASM_X86_MRST_H */
diff --git a/arch/x86/kernel/mrst.c b/arch/x86/kernel/mrst.c
index 98440e18919b..bb6e45c71dde 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.