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hpet: allow HPET FIXED_MEM32 resource type

PATCH New Randy Dunlap 1 participant 1 message Oct 18, 2005

Subsystems (2)
Char and misc drivers Hpet: High Precision Event Timers driver
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Randy Dunlap

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PATCH 1/3 hpet: allow HPET FIXED_MEM32 resource type

From: Randy Dunlap <[email protected]>

Allow the ACPI HPET description table to use a resource type of FIXED_MEM32 for the HPET reource. Use the fixed resoure size of 1 KB for the HPET resource as per the HPET spec.

Signed-off-by Randy Dunlap <[email protected]>
Acked-by Bob Picco <[email protected]>

---

drivers/char/hpet.c +17 -0
Index: linux-2614-rc4-mm1/drivers/char/hpet.c
===================================================================
@@ -49,6 +49,8 @@
 #define	HPET_USER_FREQ	(64)
 #define	HPET_DRIFT	(500)
 
+#define HPET_RANGE_SIZE		1024	/* from HPET spec */
+
 static u32 hpet_nhpet, hpet_max_freq = HPET_USER_FREQ;
 
 /* A lock for concurrent access by app and isr hpet activity. */

@@ -922,6 +924,21 @@ static acpi_status hpet_resources(struct
 		for (hpetp = hpets; hpetp; hpetp = hpetp->hp_next)
 			if (hpetp->hp_hpet == hdp->hd_address)
 				return -EBUSY;
+	} else if (res->type == ACPI_RSTYPE_FIXED_MEM32) {
+		struct acpi_resource_fixed_mem32 *fixmem32;
+
+		fixmem32 = &res->data.fixed_memory32;
+		if (!fixmem32)
+			return -EINVAL;
+
+		hdp->hd_phys_address = fixmem32->range_base_address;
+		hdp->hd_address = ioremap(fixmem32->range_base_address,
+						HPET_RANGE_SIZE);
+
+		for (hpetp = hpets; hpetp; hpetp = hpetp->hp_next)
+			if (hpetp->hp_hpet == hdp->hd_address) {
+				return -EBUSY;
+			}
 	} else if (res->type == ACPI_RSTYPE_EXT_IRQ) {
 		struct acpi_resource_ext_irq *irqp;
 		int i;

---