[ARM] 3052/1: add ixp2000 microcode loader

Patch from Lennert Buytenhek

This patch adds a microcode loader for the ixp2000 architecture.

The ixp2000 is an xscale-based CPU with a number of additional small
CPUs ('microengines') on die that can be programmed to do various
things.  Depending on the ixp2000 model, there are between 2 and 16
microengines.

This code provides an API that allows configuring the microengines,
loading code into them, and starting and stopping them and reading
out a number of status registers, and is used by the microengine
network driver that was recently announced to netdev.

Signed-off-by: Lennert Buytenhek <buytenh@wantstofly.org>
Signed-off-by: Deepak Saxena <dsaxena@plexity.net>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

2 files changed, 65 insertions, 2 deletions

diff --git a/include/asm-arm/arch-ixp2000/ixp2000-regs.h b/include/asm-arm/arch-ixp2000/ixp2000-regs.h
index 7422f6639896..fc5ac6aec4f2 100644
--- a/include/asm-arm/arch-ixp2000/ixp2000-regs.h
+++ b/include/asm-arm/arch-ixp2000/ixp2000-regs.h
@@ -59,14 +59,15 @@
 #define IXP2000_CAP_SIZE                0x00100000
 
 /*
- * Addresses for specific on-chip peripherals
+ * Addresses for specific on-chip peripherals.
  */
 #define IXP2000_SLOWPORT_CSR_VIRT_BASE  0xfef80000
 #define IXP2000_GLOBAL_REG_VIRT_BASE    0xfef04000
 #define IXP2000_UART_PHYS_BASE          0xc0030000
 #define IXP2000_UART_VIRT_BASE          0xfef30000
 #define IXP2000_TIMER_VIRT_BASE         0xfef20000
-#define IXP2000_GPIO_VIRT_BASE          0Xfef10000
+#define IXP2000_UENGINE_CSR_VIRT_BASE   0xfef18000
+#define IXP2000_GPIO_VIRT_BASE          0xfef10000
 
 /*
  * Devices outside of the 0xc0000000 -> 0xc0100000 range.  The virtual
diff --git a/include/asm-arm/arch-ixp2000/uengine.h b/include/asm-arm/arch-ixp2000/uengine.h
new file mode 100644
index 000000000000..b442d65c6593
--- /dev/null
+++ b/include/asm-arm/arch-ixp2000/uengine.h
@@ -0,0 +1,62 @@
+/*
+ * Generic library functions for the microengines found on the Intel
+ * IXP2000 series of network processors.
+ *
+ * Copyright (C) 2004, 2005 Lennert Buytenhek <buytenh@wantstofly.org>
+ * Dedicated to Marija Kulikova.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of the
+ * License, or (at your option) any later version.
+ */
+
+#ifndef __IXP2000_UENGINE_H
+#define __IXP2000_UENGINE_H
+
+extern u32 ixp2000_uengine_mask;
+
+struct ixp2000_uengine_code
+{
+        u32     cpu_model_bitmask;
+        u8      cpu_min_revision;
+        u8      cpu_max_revision;
+
+        u32     uengine_parameters;
+
+        struct ixp2000_reg_value {
+                int     reg;
+                u32     value;
+        } *initial_reg_values;
+
+        int     num_insns;
+        u8      *insns;
+};
+
+u32 ixp2000_uengine_csr_read(int uengine, int offset);
+void ixp2000_uengine_csr_write(int uengine, int offset, u32 value);
+void ixp2000_uengine_reset(u32 uengine_mask);
+void ixp2000_uengine_set_mode(int uengine, u32 mode);
+void ixp2000_uengine_load_microcode(int uengine, u8 *ucode, int insns);
+void ixp2000_uengine_init_context(int uengine, int context, int pc);
+void ixp2000_uengine_start_contexts(int uengine, u8 ctx_mask);
+void ixp2000_uengine_stop_contexts(int uengine, u8 ctx_mask);
+int ixp2000_uengine_load(int uengine, struct ixp2000_uengine_code *c);
+
+#define IXP2000_UENGINE_8_CONTEXTS              0x00000000
+#define IXP2000_UENGINE_4_CONTEXTS              0x80000000
+#define IXP2000_UENGINE_PRN_UPDATE_EVERY        0x40000000
+#define IXP2000_UENGINE_PRN_UPDATE_ON_ACCESS    0x00000000
+#define IXP2000_UENGINE_NN_FROM_SELF            0x00100000
+#define IXP2000_UENGINE_NN_FROM_PREVIOUS        0x00000000
+#define IXP2000_UENGINE_ASSERT_EMPTY_AT_3       0x000c0000
+#define IXP2000_UENGINE_ASSERT_EMPTY_AT_2       0x00080000
+#define IXP2000_UENGINE_ASSERT_EMPTY_AT_1       0x00040000
+#define IXP2000_UENGINE_ASSERT_EMPTY_AT_0       0x00000000
+#define IXP2000_UENGINE_LM_ADDR1_GLOBAL         0x00020000
+#define IXP2000_UENGINE_LM_ADDR1_PER_CONTEXT    0x00000000
+#define IXP2000_UENGINE_LM_ADDR0_GLOBAL         0x00010000
+#define IXP2000_UENGINE_LM_ADDR0_PER_CONTEXT    0x00000000
+
+
+#endif