Subject: Split out asm-ppc/mmu.h portions for PowerPC 8xx

From: David Gibson <[email-masked]>
Date: Fri, 22 Jun 2007 14:58:55 +1000

arch/powerpc still relies on asm-ppc/mmu.h for some 32-bit MMU types.
This patch is another step towards fixing this.  It takes the portions
of asm-ppc/mmu.h related to 8xx embedded CPUs which are still relevant
in arch/powerpc and puts them in a new asm-powerpc/mmu-8xx.h,
included when appropriate from asm-powerpc/mmu.h.

Signed-off-by: David Gibson <[email-masked]>
---

This applies on top of my earlier patch splitting out the Freescale
Book-E portions of mmu.h.  I've compiled this (with
mpc866_ads_defconfig) but can someone with access to an 8xx system
give it a whirl?

Index: working-2.6/include/asm-powerpc/mmu.h
===================================================================
--- working-2.6.orig/include/asm-powerpc/mmu.h	2007-06-22 14:38:56.000000000 +1000
+++ working-2.6/include/asm-powerpc/mmu.h	2007-06-22 14:41:53.000000000 +1000
@@ -14,10 +14,9 @@
 #elif defined(CONFIG_FSL_BOOKE)
 /* Freescale Book-E software loaded TLB */
 #  include <asm/mmu-fsl-booke.h>
-#else
-/* Other 32-bit.  FIXME: split up the other 32-bit MMU types, and
- * revise for arch/powerpc */
-#  include <asm-ppc/mmu.h>
+#elif defined (CONFIG_PPC_8xx)
+/* Motorola/Freescale 8xx software loaded TLB */
+#  include <asm/mmu-8xx.h>
 #endif
 
 #endif /* __KERNEL__ */
Index: working-2.6/include/asm-powerpc/mmu-8xx.h
===================================================================
--- /dev/null	1970-01-01 00:00:00.000000000 +0000
+++ working-2.6/include/asm-powerpc/mmu-8xx.h	2007-06-22 14:38:56.000000000 +1000
@@ -0,0 +1,147 @@
+#ifndef _ASM_POWERPC_MMU_8XX_H_
+#define _ASM_POWERPC_MMU_8XX_H_
+/*
+ * PPC8xx support
+ */
+
+/* Control/status registers for the MPC8xx.
+ * A write operation to these registers causes serialized access.
+ * During software tablewalk, the registers used perform mask/shift-add
+ * operations when written/read.  A TLB entry is created when the Mx_RPN
+ * is written, and the contents of several registers are used to
+ * create the entry.
+ */
+#define SPRN_MI_CTR	784	/* Instruction TLB control register */
+#define MI_GPM		0x80000000	/* Set domain manager mode */
+#define MI_PPM		0x40000000	/* Set subpage protection */
+#define MI_CIDEF	0x20000000	/* Set cache inhibit when MMU dis */
+#define MI_RSV4I	0x08000000	/* Reserve 4 TLB entries */
+#define MI_PPCS		0x02000000	/* Use MI_RPN prob/priv state */
+#define MI_IDXMASK	0x00001f00	/* TLB index to be loaded */
+#define MI_RESETVAL	0x00000000	/* Value of register at reset */
+
+/* These are the Ks and Kp from the PowerPC books.  For proper operation,
+ * Ks = 0, Kp = 1.
+ */
+#define SPRN_MI_AP	786
+#define MI_Ks		0x80000000	/* Should not be set */
+#define MI_Kp		0x40000000	/* Should always be set */
+
+/* The effective page number register.  When read, contains the information
+ * about the last instruction TLB miss.  When MI_RPN is written, bits in
+ * this register are used to create the TLB entry.
+ */
+#define SPRN_MI_EPN	787
+#define MI_EPNMASK	0xfffff000	/* Effective page number for entry */
+#define MI_EVALID	0x00000200	/* Entry is valid */
+#define MI_ASIDMASK	0x0000000f	/* ASID match value */
+					/* Reset value is undefined */
+
+/* A "level 1" or "segment" or whatever you want to call it register.
+ * For the instruction TLB, it contains bits that get loaded into the
+ * TLB entry when the MI_RPN is written.
+ */
+#define SPRN_MI_TWC	789
+#define MI_APG		0x000001e0	/* Access protection group (0) */
+#define MI_GUARDED	0x00000010	/* Guarded storage */
+#define MI_PSMASK	0x0000000c	/* Mask of page size bits */
+#define MI_PS8MEG	0x0000000c	/* 8M page size */
+#define MI_PS512K	0x00000004	/* 512K page size */
+#define MI_PS4K_16K	0x00000000	/* 4K or 16K page size */
+#define MI_SVALID	0x00000001	/* Segment entry is valid */
+					/* Reset value is undefined */
+
+/* Real page number.  Defined by the pte.  Writing this register
+ * causes a TLB entry to be created for the instruction TLB, using
+ * additional information from the MI_EPN, and MI_TWC registers.
+ */
+#define SPRN_MI_RPN	790
+
+/* Define an RPN value for mapping kernel memory to large virtual
+ * pages for boot initialization.  This has real page number of 0,
+ * large page size, shared page, cache enabled, and valid.
+ * Also mark all subpages valid and write access.
+ */
+#define MI_BOOTINIT	0x000001fd
+
+#define SPRN_MD_CTR	792	/* Data TLB control register */
+#define MD_GPM		0x80000000	/* Set domain manager mode */
+#define MD_PPM		0x40000000	/* Set subpage protection */
+#define MD_CIDEF	0x20000000	/* Set cache inhibit when MMU dis */
+#define MD_WTDEF	0x10000000	/* Set writethrough when MMU dis */
+#define MD_RSV4I	0x08000000	/* Reserve 4 TLB entries */
+#define MD_TWAM		0x04000000	/* Use 4K page hardware assist */
+#define MD_PPCS		0x02000000	/* Use MI_RPN prob/priv state */
+#define MD_IDXMASK	0x00001f00	/* TLB index to be loaded */
+#define MD_RESETVAL	0x04000000	/* Value of register at reset */
+
+#define SPRN_M_CASID	793	/* Address space ID (context) to match */
+#define MC_ASIDMASK	0x0000000f	/* Bits used for ASID value */
+
+
+/* These are the Ks and Kp from the PowerPC books.  For proper operation,
+ * Ks = 0, Kp = 1.
+ */
+#define SPRN_MD_AP	794
+#define MD_Ks		0x80000000	/* Should not be set */
+#define MD_Kp		0x40000000	/* Should always be set */
+
+/* The effective page number register.  When read, contains the information
+ * about the last instruction TLB miss.  When MD_RPN is written, bits in
+ * this register are used to create the TLB entry.
+ */
+#define SPRN_MD_EPN	795
+#define MD_EPNMASK	0xfffff000	/* Effective page number for entry */
+#define MD_EVALID	0x00000200	/* Entry is valid */
+#define MD_ASIDMASK	0x0000000f	/* ASID match value */
+					/* Reset value is undefined */
+
+/* The pointer to the base address of the first level page table.
+ * During a software tablewalk, reading this register provides the address
+ * of the entry associated with MD_EPN.
+ */
+#define SPRN_M_TWB	796
+#define	M_L1TB		0xfffff000	/* Level 1 table base address */
+#define M_L1INDX	0x00000ffc	/* Level 1 index, when read */
+					/* Reset value is undefined */
+
+/* A "level 1" or "segment" or whatever you want to call it register.
+ * For the data TLB, it contains bits that get loaded into the TLB entry
+ * when the MD_RPN is written.  It is also provides the hardware assist
+ * for finding the PTE address during software tablewalk.
+ */
+#define SPRN_MD_TWC	797
+#define MD_L2TB		0xfffff000	/* Level 2 table base address */
+#define MD_L2INDX	0xfffffe00	/* Level 2 index (*pte), when read */
+#define MD_APG		0x000001e0	/* Access protection group (0) */
+#define MD_GUARDED	0x00000010	/* Guarded storage */
+#define MD_PSMASK	0x0000000c	/* Mask of page size bits */
+#define MD_PS8MEG	0x0000000c	/* 8M page size */
+#define MD_PS512K	0x00000004	/* 512K page size */
+#define MD_PS4K_16K	0x00000000	/* 4K or 16K page size */
+#define MD_WT		0x00000002	/* Use writethrough page attribute */
+#define MD_SVALID	0x00000001	/* Segment entry is valid */
+					/* Reset value is undefined */
+
+
+/* Real page number.  Defined by the pte.  Writing this register
+ * causes a TLB entry to be created for the data TLB, using
+ * additional information from the MD_EPN, and MD_TWC registers.
+ */
+#define SPRN_MD_RPN	798
+
+/* This is a temporary storage register that could be used to save
+ * a processor working register during a tablewalk.
+ */
+#define SPRN_M_TW	799
+
+#ifndef __ASSEMBLY__
+typedef unsigned long phys_addr_t;
+
+typedef struct {
+	unsigned long id;
+	unsigned long vdso_base;
+} mm_context_t;
+#endif /* !__ASSEMBLY__ */
+
+#endif /* _ASM_POWERPC_MMU_8XX_H_ */

-- 
David Gibson			| I'll have my music baroque, and my code
david AT gibson.dropbear.id.au	| minimalist, thank you.  NOT _the_ _other_
				| _way_ _around_!
http://www.ozlabs.org/~dgibson