[ARM] 4713/3: Adds drivers for IXP4xx QMgr and NPE features

This patch adds drivers for IXP4xx hardware Queue Manager and for
Network Processor Engines. Requires patch #4712 (reading/writing
CPU feature (aka fuse) bits).

Posted to linux-arm-kernel on 2 Dec 2007 and revised.

Signed-off-by: Krzysztof Halasa <khc@pm.waw.pl>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 126 insertions, 0 deletions

diff --git a/include/asm-arm/arch-ixp4xx/qmgr.h b/include/asm-arm/arch-ixp4xx/qmgr.h
new file mode 100644
index 00000000000..1e52b95cede
--- /dev/null
+++ b/include/asm-arm/arch-ixp4xx/qmgr.h
@@ -0,0 +1,126 @@
+/*
+ * Copyright (C) 2007 Krzysztof Halasa <khc@pm.waw.pl>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of version 2 of the GNU General Public License
+ * as published by the Free Software Foundation.
+ */
+
+#ifndef IXP4XX_QMGR_H
+#define IXP4XX_QMGR_H
+
+#include <linux/io.h>
+#include <linux/kernel.h>
+
+#define HALF_QUEUES	32
+#define QUEUES		64	/* only 32 lower queues currently supported */
+#define MAX_QUEUE_LENGTH 4	/* in dwords */
+
+#define QUEUE_STAT1_EMPTY		1 /* queue status bits */
+#define QUEUE_STAT1_NEARLY_EMPTY	2
+#define QUEUE_STAT1_NEARLY_FULL		4
+#define QUEUE_STAT1_FULL		8
+#define QUEUE_STAT2_UNDERFLOW		1
+#define QUEUE_STAT2_OVERFLOW		2
+
+#define QUEUE_WATERMARK_0_ENTRIES	0
+#define QUEUE_WATERMARK_1_ENTRY		1
+#define QUEUE_WATERMARK_2_ENTRIES	2
+#define QUEUE_WATERMARK_4_ENTRIES	3
+#define QUEUE_WATERMARK_8_ENTRIES	4
+#define QUEUE_WATERMARK_16_ENTRIES	5
+#define QUEUE_WATERMARK_32_ENTRIES	6
+#define QUEUE_WATERMARK_64_ENTRIES	7
+
+/* queue interrupt request conditions */
+#define QUEUE_IRQ_SRC_EMPTY		0
+#define QUEUE_IRQ_SRC_NEARLY_EMPTY	1
+#define QUEUE_IRQ_SRC_NEARLY_FULL	2
+#define QUEUE_IRQ_SRC_FULL		3
+#define QUEUE_IRQ_SRC_NOT_EMPTY		4
+#define QUEUE_IRQ_SRC_NOT_NEARLY_EMPTY	5
+#define QUEUE_IRQ_SRC_NOT_NEARLY_FULL	6
+#define QUEUE_IRQ_SRC_NOT_FULL		7
+
+struct qmgr_regs {
+	u32 acc[QUEUES][MAX_QUEUE_LENGTH]; /* 0x000 - 0x3FF */
+	u32 stat1[4];		/* 0x400 - 0x40F */
+	u32 stat2[2];		/* 0x410 - 0x417 */
+	u32 statne_h;		/* 0x418 - queue nearly empty */
+	u32 statf_h;		/* 0x41C - queue full */
+	u32 irqsrc[4];		/* 0x420 - 0x42F IRC source */
+	u32 irqen[2];		/* 0x430 - 0x437 IRQ enabled */
+	u32 irqstat[2];		/* 0x438 - 0x43F - IRQ access only */
+	u32 reserved[1776];
+	u32 sram[2048];		/* 0x2000 - 0x3FFF - config and buffer */
+};
+
+void qmgr_set_irq(unsigned int queue, int src,
+		  void (*handler)(void *pdev), void *pdev);
+void qmgr_enable_irq(unsigned int queue);
+void qmgr_disable_irq(unsigned int queue);
+
+/* request_ and release_queue() must be called from non-IRQ context */
+int qmgr_request_queue(unsigned int queue, unsigned int len /* dwords */,
+		       unsigned int nearly_empty_watermark,
+		       unsigned int nearly_full_watermark);
+void qmgr_release_queue(unsigned int queue);
+
+
+static inline void qmgr_put_entry(unsigned int queue, u32 val)
+{
+	extern struct qmgr_regs __iomem *qmgr_regs;
+	__raw_writel(val, &qmgr_regs->acc[queue][0]);
+}
+
+static inline u32 qmgr_get_entry(unsigned int queue)
+{
+	extern struct qmgr_regs __iomem *qmgr_regs;
+	return __raw_readl(&qmgr_regs->acc[queue][0]);
+}
+
+static inline int qmgr_get_stat1(unsigned int queue)
+{
+	extern struct qmgr_regs __iomem *qmgr_regs;
+	return (__raw_readl(&qmgr_regs->stat1[queue >> 3])
+		>> ((queue & 7) << 2)) & 0xF;
+}
+
+static inline int qmgr_get_stat2(unsigned int queue)
+{
+	extern struct qmgr_regs __iomem *qmgr_regs;
+	return (__raw_readl(&qmgr_regs->stat2[queue >> 4])
+		>> ((queue & 0xF) << 1)) & 0x3;
+}
+
+static inline int qmgr_stat_empty(unsigned int queue)
+{
+	return !!(qmgr_get_stat1(queue) & QUEUE_STAT1_EMPTY);
+}
+
+static inline int qmgr_stat_nearly_empty(unsigned int queue)
+{
+	return !!(qmgr_get_stat1(queue) & QUEUE_STAT1_NEARLY_EMPTY);
+}
+
+static inline int qmgr_stat_nearly_full(unsigned int queue)
+{
+	return !!(qmgr_get_stat1(queue) & QUEUE_STAT1_NEARLY_FULL);
+}
+
+static inline int qmgr_stat_full(unsigned int queue)
+{
+	return !!(qmgr_get_stat1(queue) & QUEUE_STAT1_FULL);
+}
+
+static inline int qmgr_stat_underflow(unsigned int queue)
+{
+	return !!(qmgr_get_stat2(queue) & QUEUE_STAT2_UNDERFLOW);
+}
+
+static inline int qmgr_stat_overflow(unsigned int queue)
+{
+	return !!(qmgr_get_stat2(queue) & QUEUE_STAT2_OVERFLOW);
+}
+
+#endif