[deliverable/linux.git] / arch / powerpc / mm / fsl_booke_mmu.c

/*
 * Modifications by Kumar Gala (galak@kernel.crashing.org) to support
 * E500 Book E processors.
 *
 * Copyright 2004 Freescale Semiconductor, Inc
 *
 * This file contains the routines for initializing the MMU
 * on the 4xx series of chips.
 *  -- paulus
 *
 *  Derived from arch/ppc/mm/init.c:
 *    Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
 *
 *  Modifications by Paul Mackerras (PowerMac) (paulus@cs.anu.edu.au)
 *  and Cort Dougan (PReP) (cort@cs.nmt.edu)
 *    Copyright (C) 1996 Paul Mackerras
 *
 *  Derived from "arch/i386/mm/init.c"
 *    Copyright (C) 1991, 1992, 1993, 1994  Linus Torvalds
 *
 *  This program is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU General Public License
 *  as published by the Free Software Foundation; either version
 *  2 of the License, or (at your option) any later version.
 *
 */

#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/types.h>
#include <linux/ptrace.h>
#include <linux/mman.h>
#include <linux/mm.h>
#include <linux/swap.h>
#include <linux/stddef.h>
#include <linux/vmalloc.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/highmem.h>

#include <asm/pgalloc.h>
#include <asm/prom.h>
#include <asm/io.h>
#include <asm/mmu_context.h>
#include <asm/pgtable.h>
#include <asm/mmu.h>
#include <asm/uaccess.h>
#include <asm/smp.h>
#include <asm/bootx.h>
#include <asm/machdep.h>
#include <asm/setup.h>

extern void loadcam_entry(unsigned int index);
unsigned int tlbcam_index;
unsigned int num_tlbcam_entries;
static unsigned long __cam0, __cam1, __cam2;
extern unsigned long total_lowmem;
extern unsigned long __max_low_memory;
#define MAX_LOW_MEM	CONFIG_LOWMEM_SIZE

#define NUM_TLBCAMS	(16)

struct tlbcam {
   	u32	MAS0;
	u32	MAS1;
	u32	MAS2;
	u32	MAS3;
	u32	MAS7;
} TLBCAM[NUM_TLBCAMS];

struct tlbcamrange {
   	unsigned long start;
	unsigned long limit;
	phys_addr_t phys;
} tlbcam_addrs[NUM_TLBCAMS];

extern unsigned int tlbcam_index;

/*
 * Return PA for this VA if it is mapped by a CAM, or 0
 */
unsigned long v_mapped_by_tlbcam(unsigned long va)
{
	int b;
	for (b = 0; b < tlbcam_index; ++b)
		if (va >= tlbcam_addrs[b].start && va < tlbcam_addrs[b].limit)
			return tlbcam_addrs[b].phys + (va - tlbcam_addrs[b].start);
	return 0;
}

/*
 * Return VA for a given PA or 0 if not mapped
 */
unsigned long p_mapped_by_tlbcam(unsigned long pa)
{
	int b;
	for (b = 0; b < tlbcam_index; ++b)
		if (pa >= tlbcam_addrs[b].phys
	    	    && pa < (tlbcam_addrs[b].limit-tlbcam_addrs[b].start)
		              +tlbcam_addrs[b].phys)
			return tlbcam_addrs[b].start+(pa-tlbcam_addrs[b].phys);
	return 0;
}

/*
 * Set up one of the I/D BAT (block address translation) register pairs.
 * The parameters are not checked; in particular size must be a power
 * of 4 between 4k and 256M.
 */
void settlbcam(int index, unsigned long virt, phys_addr_t phys,
		unsigned int size, int flags, unsigned int pid)
{
	unsigned int tsize, lz;

	asm ("cntlzw %0,%1" : "=r" (lz) : "r" (size));
	tsize = (21 - lz) / 2;

#ifdef CONFIG_SMP
	if ((flags & _PAGE_NO_CACHE) == 0)
		flags |= _PAGE_COHERENT;
#endif

	TLBCAM[index].MAS0 = MAS0_TLBSEL(1) | MAS0_ESEL(index) | MAS0_NV(index+1);
	TLBCAM[index].MAS1 = MAS1_VALID | MAS1_IPROT | MAS1_TSIZE(tsize) | MAS1_TID(pid);
	TLBCAM[index].MAS2 = virt & PAGE_MASK;

	TLBCAM[index].MAS2 |= (flags & _PAGE_WRITETHRU) ? MAS2_W : 0;
	TLBCAM[index].MAS2 |= (flags & _PAGE_NO_CACHE) ? MAS2_I : 0;
	TLBCAM[index].MAS2 |= (flags & _PAGE_COHERENT) ? MAS2_M : 0;
	TLBCAM[index].MAS2 |= (flags & _PAGE_GUARDED) ? MAS2_G : 0;
	TLBCAM[index].MAS2 |= (flags & _PAGE_ENDIAN) ? MAS2_E : 0;

	TLBCAM[index].MAS3 = (phys & PAGE_MASK) | MAS3_SX | MAS3_SR;
	TLBCAM[index].MAS3 |= ((flags & _PAGE_RW) ? MAS3_SW : 0);

#ifndef CONFIG_KGDB /* want user access for breakpoints */
	if (flags & _PAGE_USER) {
	   TLBCAM[index].MAS3 |= MAS3_UX | MAS3_UR;
	   TLBCAM[index].MAS3 |= ((flags & _PAGE_RW) ? MAS3_UW : 0);
	}
#else
	TLBCAM[index].MAS3 |= MAS3_UX | MAS3_UR;
	TLBCAM[index].MAS3 |= ((flags & _PAGE_RW) ? MAS3_UW : 0);
#endif

	tlbcam_addrs[index].start = virt;
	tlbcam_addrs[index].limit = virt + size - 1;
	tlbcam_addrs[index].phys = phys;

	loadcam_entry(index);
}

void invalidate_tlbcam_entry(int index)
{
	TLBCAM[index].MAS0 = MAS0_TLBSEL(1) | MAS0_ESEL(index);
	TLBCAM[index].MAS1 = ~MAS1_VALID;

	loadcam_entry(index);
}

void __init cam_mapin_ram(unsigned long cam0, unsigned long cam1,
		unsigned long cam2)
{
	settlbcam(0, KERNELBASE, PPC_MEMSTART, cam0, _PAGE_KERNEL, 0);
	tlbcam_index++;
	if (cam1) {
		tlbcam_index++;
		settlbcam(1, KERNELBASE+cam0, PPC_MEMSTART+cam0, cam1, _PAGE_KERNEL, 0);
	}
	if (cam2) {
		tlbcam_index++;
		settlbcam(2, KERNELBASE+cam0+cam1, PPC_MEMSTART+cam0+cam1, cam2, _PAGE_KERNEL, 0);
	}
}

/*
 * MMU_init_hw does the chip-specific initialization of the MMU hardware.
 */
void __init MMU_init_hw(void)
{
	flush_instruction_cache();
}

unsigned long __init mmu_mapin_ram(void)
{
	cam_mapin_ram(__cam0, __cam1, __cam2);

	return __cam0 + __cam1 + __cam2;
}


void __init
adjust_total_lowmem(void)
{
	unsigned long max_low_mem = MAX_LOW_MEM;
	unsigned long cam_max = 0x10000000;
	unsigned long ram;

	/* adjust CAM size to max_low_mem */
	if (max_low_mem < cam_max)
		cam_max = max_low_mem;

	/* adjust lowmem size to max_low_mem */
	if (max_low_mem < total_lowmem)
		ram = max_low_mem;
	else
		ram = total_lowmem;

	/* Calculate CAM values */
	__cam0 = 1UL << 2 * (__ilog2(ram) / 2);
	if (__cam0 > cam_max)
		__cam0 = cam_max;
	ram -= __cam0;
	if (ram) {
		__cam1 = 1UL << 2 * (__ilog2(ram) / 2);
		if (__cam1 > cam_max)
			__cam1 = cam_max;
		ram -= __cam1;
	}
	if (ram) {
		__cam2 = 1UL << 2 * (__ilog2(ram) / 2);
		if (__cam2 > cam_max)
			__cam2 = cam_max;
		ram -= __cam2;
	}

	printk(KERN_INFO "Memory CAM mapping: CAM0=%ldMb, CAM1=%ldMb,"
			" CAM2=%ldMb residual: %ldMb\n",
			__cam0 >> 20, __cam1 >> 20, __cam2 >> 20,
			(total_lowmem - __cam0 - __cam1 - __cam2) >> 20);
	__max_low_memory = max_low_mem = __cam0 + __cam1 + __cam2;
}
Commit	Line	Data
14cf11af	1	/*
4c8d3d99	2	* Modifications by Kumar Gala (galak@kernel.crashing.org) to support
14cf11af PM	3	* E500 Book E processors.
	4	*
	5	* Copyright 2004 Freescale Semiconductor, Inc
	6	*
	7	* This file contains the routines for initializing the MMU
	8	* on the 4xx series of chips.
	9	* -- paulus
	10	*
	11	* Derived from arch/ppc/mm/init.c:
	12	* Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
	13	*
	14	* Modifications by Paul Mackerras (PowerMac) (paulus@cs.anu.edu.au)
	15	* and Cort Dougan (PReP) (cort@cs.nmt.edu)
	16	* Copyright (C) 1996 Paul Mackerras
14cf11af PM	17	*
	18	* Derived from "arch/i386/mm/init.c"
	19	* Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds
	20	*
	21	* This program is free software; you can redistribute it and/or
	22	* modify it under the terms of the GNU General Public License
	23	* as published by the Free Software Foundation; either version
	24	* 2 of the License, or (at your option) any later version.
	25	*
	26	*/
	27
14cf11af PM	28	#include <linux/signal.h>
	29	#include <linux/sched.h>
	30	#include <linux/kernel.h>
	31	#include <linux/errno.h>
	32	#include <linux/string.h>
	33	#include <linux/types.h>
	34	#include <linux/ptrace.h>
	35	#include <linux/mman.h>
	36	#include <linux/mm.h>
	37	#include <linux/swap.h>
	38	#include <linux/stddef.h>
	39	#include <linux/vmalloc.h>
	40	#include <linux/init.h>
	41	#include <linux/delay.h>
	42	#include <linux/highmem.h>
	43
	44	#include <asm/pgalloc.h>
	45	#include <asm/prom.h>
	46	#include <asm/io.h>
	47	#include <asm/mmu_context.h>
	48	#include <asm/pgtable.h>
	49	#include <asm/mmu.h>
	50	#include <asm/uaccess.h>
	51	#include <asm/smp.h>
	52	#include <asm/bootx.h>
	53	#include <asm/machdep.h>
	54	#include <asm/setup.h>
	55
	56	extern void loadcam_entry(unsigned int index);
	57	unsigned int tlbcam_index;
	58	unsigned int num_tlbcam_entries;
	59	static unsigned long __cam0, __cam1, __cam2;
	60	extern unsigned long total_lowmem;
	61	extern unsigned long __max_low_memory;
	62	#define MAX_LOW_MEM CONFIG_LOWMEM_SIZE
	63
	64	#define NUM_TLBCAMS (16)
	65
	66	struct tlbcam {
	67	u32 MAS0;
	68	u32 MAS1;
	69	u32 MAS2;
	70	u32 MAS3;
	71	u32 MAS7;
	72	} TLBCAM[NUM_TLBCAMS];
	73
	74	struct tlbcamrange {
	75	unsigned long start;
	76	unsigned long limit;
	77	phys_addr_t phys;
	78	} tlbcam_addrs[NUM_TLBCAMS];
	79
	80	extern unsigned int tlbcam_index;
	81
	82	/*
	83	* Return PA for this VA if it is mapped by a CAM, or 0
	84	*/
	85	unsigned long v_mapped_by_tlbcam(unsigned long va)
	86	{
	87	int b;
	88	for (b = 0; b < tlbcam_index; ++b)
	89	if (va >= tlbcam_addrs[b].start && va < tlbcam_addrs[b].limit)
	90	return tlbcam_addrs[b].phys + (va - tlbcam_addrs[b].start);
	91	return 0;
92	}
93
94	/*
95	* Return VA for a given PA or 0 if not mapped
96	*/
97	unsigned long p_mapped_by_tlbcam(unsigned long pa)
98	{
99	int b;
100	for (b = 0; b < tlbcam_index; ++b)
101	if (pa >= tlbcam_addrs[b].phys
102	&& pa < (tlbcam_addrs[b].limit-tlbcam_addrs[b].start)
103	+tlbcam_addrs[b].phys)
104	return tlbcam_addrs[b].start+(pa-tlbcam_addrs[b].phys);
105	return 0;
106	}
107
108	/*
109	* Set up one of the I/D BAT (block address translation) register pairs.
110	* The parameters are not checked; in particular size must be a power
111	* of 4 between 4k and 256M.
112	*/
113	void settlbcam(int index, unsigned long virt, phys_addr_t phys,
114	unsigned int size, int flags, unsigned int pid)
115	{
116	unsigned int tsize, lz;
117
118	asm ("cntlzw %0,%1" : "=r" (lz) : "r" (size));
119	tsize = (21 - lz) / 2;
120
121	#ifdef CONFIG_SMP
122	if ((flags & _PAGE_NO_CACHE) == 0)
123	flags \|= _PAGE_COHERENT;
124	#endif
125
126	TLBCAM[index].MAS0 = MAS0_TLBSEL(1) \| MAS0_ESEL(index) \| MAS0_NV(index+1);
127	TLBCAM[index].MAS1 = MAS1_VALID \| MAS1_IPROT \| MAS1_TSIZE(tsize) \| MAS1_TID(pid);
128	TLBCAM[index].MAS2 = virt & PAGE_MASK;
129
130	TLBCAM[index].MAS2 \|= (flags & _PAGE_WRITETHRU) ? MAS2_W : 0;
131	TLBCAM[index].MAS2 \|= (flags & _PAGE_NO_CACHE) ? MAS2_I : 0;
132	TLBCAM[index].MAS2 \|= (flags & _PAGE_COHERENT) ? MAS2_M : 0;
133	TLBCAM[index].MAS2 \|= (flags & _PAGE_GUARDED) ? MAS2_G : 0;
134	TLBCAM[index].MAS2 \|= (flags & _PAGE_ENDIAN) ? MAS2_E : 0;
135
136	TLBCAM[index].MAS3 = (phys & PAGE_MASK) \| MAS3_SX \| MAS3_SR;
137	TLBCAM[index].MAS3 \|= ((flags & _PAGE_RW) ? MAS3_SW : 0);
138
139	#ifndef CONFIG_KGDB /* want user access for breakpoints */
140	if (flags & _PAGE_USER) {
141	TLBCAM[index].MAS3 \|= MAS3_UX \| MAS3_UR;
142	TLBCAM[index].MAS3 \|= ((flags & _PAGE_RW) ? MAS3_UW : 0);
143	}
144	#else
145	TLBCAM[index].MAS3 \|= MAS3_UX \| MAS3_UR;
146	TLBCAM[index].MAS3 \|= ((flags & _PAGE_RW) ? MAS3_UW : 0);
147	#endif
148
149	tlbcam_addrs[index].start = virt;
150	tlbcam_addrs[index].limit = virt + size - 1;
151	tlbcam_addrs[index].phys = phys;
152
153	loadcam_entry(index);
154	}
155
156	void invalidate_tlbcam_entry(int index)
157	{
158	TLBCAM[index].MAS0 = MAS0_TLBSEL(1) \| MAS0_ESEL(index);
159	TLBCAM[index].MAS1 = ~MAS1_VALID;
160
161	loadcam_entry(index);
162	}
163
164	void __init cam_mapin_ram(unsigned long cam0, unsigned long cam1,
165	unsigned long cam2)
166	{
167	settlbcam(0, KERNELBASE, PPC_MEMSTART, cam0, _PAGE_KERNEL, 0);
168	tlbcam_index++;
169	if (cam1) {
170	tlbcam_index++;
171	settlbcam(1, KERNELBASE+cam0, PPC_MEMSTART+cam0, cam1, _PAGE_KERNEL, 0);
172	}
173	if (cam2) {
174	tlbcam_index++;
175	settlbcam(2, KERNELBASE+cam0+cam1, PPC_MEMSTART+cam0+cam1, cam2, _PAGE_KERNEL, 0);
176	}
177	}
178
179	/*
180	* MMU_init_hw does the chip-specific initialization of the MMU hardware.
181	*/
182	void __init MMU_init_hw(void)
183	{
184	flush_instruction_cache();
185	}
186
187	unsigned long __init mmu_mapin_ram(void)
188	{
189	cam_mapin_ram(__cam0, __cam1, __cam2);
190
191	return __cam0 + __cam1 + __cam2;
192	}
193
194
195	void __init
196	adjust_total_lowmem(void)
197	{
198	unsigned long max_low_mem = MAX_LOW_MEM;
199	unsigned long cam_max = 0x10000000;
200	unsigned long ram;
201
202	/* adjust CAM size to max_low_mem */
203	if (max_low_mem < cam_max)
204	cam_max = max_low_mem;
205
206	/* adjust lowmem size to max_low_mem */
207	if (max_low_mem < total_lowmem)
208	ram = max_low_mem;
209	else
210	ram = total_lowmem;
211
212	/* Calculate CAM values */
213	__cam0 = 1UL << 2 * (__ilog2(ram) / 2);
214	if (__cam0 > cam_max)
215	__cam0 = cam_max;
216	ram -= __cam0;
217	if (ram) {
218	__cam1 = 1UL << 2 * (__ilog2(ram) / 2);
219	if (__cam1 > cam_max)
220	__cam1 = cam_max;
221	ram -= __cam1;
222	}
223	if (ram) {
224	__cam2 = 1UL << 2 * (__ilog2(ram) / 2);
225	if (__cam2 > cam_max)
226	__cam2 = cam_max;
227	ram -= __cam2;
228	}
229
230	printk(KERN_INFO "Memory CAM mapping: CAM0=%ldMb, CAM1=%ldMb,"
231	" CAM2=%ldMb residual: %ldMb\n",
232	__cam0 >> 20, __cam1 >> 20, __cam2 >> 20,
233	(total_lowmem - __cam0 - __cam1 - __cam2) >> 20);
234	__max_low_memory = max_low_mem = __cam0 + __cam1 + __cam2;
235	}