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Date: Fri, 12 Feb 2010 17:40:55 -0800
From: "Pan, Jacob jun" <jacob.jun.pan@...el.com>
To: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC: Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
Arjan van de Ven <arjan@...ux.intel.com>,
"Barnes, Jesse" <jesse.barnes@...el.com>,
"Du, Alek" <alek.du@...el.com>, "Tang, Feng" <feng.tang@...el.com>,
"H. Peter Anvin" <hpa@...ux.intel.com>
Subject: [PATCH 5/8] x86/mrst: add platform timer info parsing code
>From a12c791f444d51e14366bef7f61521920f2bb4ed Mon Sep 17 00:00:00 2001
From: Jacob Pan <jacob.jun.pan@...el.com>
Date: Fri, 12 Feb 2010 03:08:30 -0800
Subject: [PATCH 5/8] 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@...el.com>
---
arch/x86/include/asm/mrst.h | 2 +
arch/x86/kernel/mrst.c | 110 +++++++++++++++++++++++++++++++++++++++++++
2 files changed, 112 insertions(+), 0 deletions(-)
diff --git a/arch/x86/include/asm/mrst.h b/arch/x86/include/asm/mrst.h
index 57a177a..fa144f2 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 98440e1..bb6e45c 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.
--
1.6.5.3
--
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