arm64: dts: Revert "specify console via command line"
[linux/fpc-iii.git] / arch / sparc / mm / leon_mm.c
blobec61ff1f96b71a364116330c532d543eb6f3c2d4
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * linux/arch/sparc/mm/leon_m.c
5 * Copyright (C) 2004 Konrad Eisele (eiselekd@web.de, konrad@gaisler.com) Gaisler Research
6 * Copyright (C) 2009 Daniel Hellstrom (daniel@gaisler.com) Aeroflex Gaisler AB
7 * Copyright (C) 2009 Konrad Eisele (konrad@gaisler.com) Aeroflex Gaisler AB
9 * do srmmu probe in software
13 #include <linux/kernel.h>
14 #include <linux/mm.h>
15 #include <asm/asi.h>
16 #include <asm/leon.h>
17 #include <asm/tlbflush.h>
19 #include "mm_32.h"
21 int leon_flush_during_switch = 1;
22 static int srmmu_swprobe_trace;
24 static inline unsigned long leon_get_ctable_ptr(void)
26 unsigned int retval;
28 __asm__ __volatile__("lda [%1] %2, %0\n\t" :
29 "=r" (retval) :
30 "r" (SRMMU_CTXTBL_PTR),
31 "i" (ASI_LEON_MMUREGS));
32 return (retval & SRMMU_CTX_PMASK) << 4;
36 unsigned long leon_swprobe(unsigned long vaddr, unsigned long *paddr)
39 unsigned int ctxtbl;
40 unsigned int pgd, pmd, ped;
41 unsigned int ptr;
42 unsigned int lvl, pte, paddrbase;
43 unsigned int ctx;
44 unsigned int paddr_calc;
46 paddrbase = 0;
48 if (srmmu_swprobe_trace)
49 printk(KERN_INFO "swprobe: trace on\n");
51 ctxtbl = leon_get_ctable_ptr();
52 if (!(ctxtbl)) {
53 if (srmmu_swprobe_trace)
54 printk(KERN_INFO "swprobe: leon_get_ctable_ptr returned 0=>0\n");
55 return 0;
57 if (!_pfn_valid(PFN(ctxtbl))) {
58 if (srmmu_swprobe_trace)
59 printk(KERN_INFO
60 "swprobe: !_pfn_valid(%x)=>0\n",
61 PFN(ctxtbl));
62 return 0;
65 ctx = srmmu_get_context();
66 if (srmmu_swprobe_trace)
67 printk(KERN_INFO "swprobe: --- ctx (%x) ---\n", ctx);
69 pgd = LEON_BYPASS_LOAD_PA(ctxtbl + (ctx * 4));
71 if (((pgd & SRMMU_ET_MASK) == SRMMU_ET_PTE)) {
72 if (srmmu_swprobe_trace)
73 printk(KERN_INFO "swprobe: pgd is entry level 3\n");
74 lvl = 3;
75 pte = pgd;
76 paddrbase = pgd & _SRMMU_PTE_PMASK_LEON;
77 goto ready;
79 if (((pgd & SRMMU_ET_MASK) != SRMMU_ET_PTD)) {
80 if (srmmu_swprobe_trace)
81 printk(KERN_INFO "swprobe: pgd is invalid => 0\n");
82 return 0;
85 if (srmmu_swprobe_trace)
86 printk(KERN_INFO "swprobe: --- pgd (%x) ---\n", pgd);
88 ptr = (pgd & SRMMU_PTD_PMASK) << 4;
89 ptr += ((((vaddr) >> LEON_PGD_SH) & LEON_PGD_M) * 4);
90 if (!_pfn_valid(PFN(ptr)))
91 return 0;
93 pmd = LEON_BYPASS_LOAD_PA(ptr);
94 if (((pmd & SRMMU_ET_MASK) == SRMMU_ET_PTE)) {
95 if (srmmu_swprobe_trace)
96 printk(KERN_INFO "swprobe: pmd is entry level 2\n");
97 lvl = 2;
98 pte = pmd;
99 paddrbase = pmd & _SRMMU_PTE_PMASK_LEON;
100 goto ready;
102 if (((pmd & SRMMU_ET_MASK) != SRMMU_ET_PTD)) {
103 if (srmmu_swprobe_trace)
104 printk(KERN_INFO "swprobe: pmd is invalid => 0\n");
105 return 0;
108 if (srmmu_swprobe_trace)
109 printk(KERN_INFO "swprobe: --- pmd (%x) ---\n", pmd);
111 ptr = (pmd & SRMMU_PTD_PMASK) << 4;
112 ptr += (((vaddr >> LEON_PMD_SH) & LEON_PMD_M) * 4);
113 if (!_pfn_valid(PFN(ptr))) {
114 if (srmmu_swprobe_trace)
115 printk(KERN_INFO "swprobe: !_pfn_valid(%x)=>0\n",
116 PFN(ptr));
117 return 0;
120 ped = LEON_BYPASS_LOAD_PA(ptr);
122 if (((ped & SRMMU_ET_MASK) == SRMMU_ET_PTE)) {
123 if (srmmu_swprobe_trace)
124 printk(KERN_INFO "swprobe: ped is entry level 1\n");
125 lvl = 1;
126 pte = ped;
127 paddrbase = ped & _SRMMU_PTE_PMASK_LEON;
128 goto ready;
130 if (((ped & SRMMU_ET_MASK) != SRMMU_ET_PTD)) {
131 if (srmmu_swprobe_trace)
132 printk(KERN_INFO "swprobe: ped is invalid => 0\n");
133 return 0;
136 if (srmmu_swprobe_trace)
137 printk(KERN_INFO "swprobe: --- ped (%x) ---\n", ped);
139 ptr = (ped & SRMMU_PTD_PMASK) << 4;
140 ptr += (((vaddr >> LEON_PTE_SH) & LEON_PTE_M) * 4);
141 if (!_pfn_valid(PFN(ptr)))
142 return 0;
144 ptr = LEON_BYPASS_LOAD_PA(ptr);
145 if (((ptr & SRMMU_ET_MASK) == SRMMU_ET_PTE)) {
146 if (srmmu_swprobe_trace)
147 printk(KERN_INFO "swprobe: ptr is entry level 0\n");
148 lvl = 0;
149 pte = ptr;
150 paddrbase = ptr & _SRMMU_PTE_PMASK_LEON;
151 goto ready;
153 if (srmmu_swprobe_trace)
154 printk(KERN_INFO "swprobe: ptr is invalid => 0\n");
155 return 0;
157 ready:
158 switch (lvl) {
159 case 0:
160 paddr_calc =
161 (vaddr & ~(-1 << LEON_PTE_SH)) | ((pte & ~0xff) << 4);
162 break;
163 case 1:
164 paddr_calc =
165 (vaddr & ~(-1 << LEON_PMD_SH)) | ((pte & ~0xff) << 4);
166 break;
167 case 2:
168 paddr_calc =
169 (vaddr & ~(-1 << LEON_PGD_SH)) | ((pte & ~0xff) << 4);
170 break;
171 default:
172 case 3:
173 paddr_calc = vaddr;
174 break;
176 if (srmmu_swprobe_trace)
177 printk(KERN_INFO "swprobe: padde %x\n", paddr_calc);
178 if (paddr)
179 *paddr = paddr_calc;
180 return pte;
183 void leon_flush_icache_all(void)
185 __asm__ __volatile__(" flush "); /*iflush*/
188 void leon_flush_dcache_all(void)
190 __asm__ __volatile__("sta %%g0, [%%g0] %0\n\t" : :
191 "i"(ASI_LEON_DFLUSH) : "memory");
194 void leon_flush_pcache_all(struct vm_area_struct *vma, unsigned long page)
196 if (vma->vm_flags & VM_EXEC)
197 leon_flush_icache_all();
198 leon_flush_dcache_all();
201 void leon_flush_cache_all(void)
203 __asm__ __volatile__(" flush "); /*iflush*/
204 __asm__ __volatile__("sta %%g0, [%%g0] %0\n\t" : :
205 "i"(ASI_LEON_DFLUSH) : "memory");
208 void leon_flush_tlb_all(void)
210 leon_flush_cache_all();
211 __asm__ __volatile__("sta %%g0, [%0] %1\n\t" : : "r"(0x400),
212 "i"(ASI_LEON_MMUFLUSH) : "memory");
215 /* get all cache regs */
216 void leon3_getCacheRegs(struct leon3_cacheregs *regs)
218 unsigned long ccr, iccr, dccr;
220 if (!regs)
221 return;
222 /* Get Cache regs from "Cache ASI" address 0x0, 0x8 and 0xC */
223 __asm__ __volatile__("lda [%%g0] %3, %0\n\t"
224 "mov 0x08, %%g1\n\t"
225 "lda [%%g1] %3, %1\n\t"
226 "mov 0x0c, %%g1\n\t"
227 "lda [%%g1] %3, %2\n\t"
228 : "=r"(ccr), "=r"(iccr), "=r"(dccr)
229 /* output */
230 : "i"(ASI_LEON_CACHEREGS) /* input */
231 : "g1" /* clobber list */
233 regs->ccr = ccr;
234 regs->iccr = iccr;
235 regs->dccr = dccr;
238 /* Due to virtual cache we need to check cache configuration if
239 * it is possible to skip flushing in some cases.
241 * Leon2 and Leon3 differ in their way of telling cache information
244 int __init leon_flush_needed(void)
246 int flush_needed = -1;
247 unsigned int ssize, sets;
248 char *setStr[4] =
249 { "direct mapped", "2-way associative", "3-way associative",
250 "4-way associative"
252 /* leon 3 */
253 struct leon3_cacheregs cregs;
254 leon3_getCacheRegs(&cregs);
255 sets = (cregs.dccr & LEON3_XCCR_SETS_MASK) >> 24;
256 /* (ssize=>realsize) 0=>1k, 1=>2k, 2=>4k, 3=>8k ... */
257 ssize = 1 << ((cregs.dccr & LEON3_XCCR_SSIZE_MASK) >> 20);
259 printk(KERN_INFO "CACHE: %s cache, set size %dk\n",
260 sets > 3 ? "unknown" : setStr[sets], ssize);
261 if ((ssize <= (PAGE_SIZE / 1024)) && (sets == 0)) {
262 /* Set Size <= Page size ==>
263 flush on every context switch not needed. */
264 flush_needed = 0;
265 printk(KERN_INFO "CACHE: not flushing on every context switch\n");
267 return flush_needed;
270 void leon_switch_mm(void)
272 flush_tlb_mm((void *)0);
273 if (leon_flush_during_switch)
274 leon_flush_cache_all();
277 static void leon_flush_cache_mm(struct mm_struct *mm)
279 leon_flush_cache_all();
282 static void leon_flush_cache_page(struct vm_area_struct *vma, unsigned long page)
284 leon_flush_pcache_all(vma, page);
287 static void leon_flush_cache_range(struct vm_area_struct *vma,
288 unsigned long start,
289 unsigned long end)
291 leon_flush_cache_all();
294 static void leon_flush_tlb_mm(struct mm_struct *mm)
296 leon_flush_tlb_all();
299 static void leon_flush_tlb_page(struct vm_area_struct *vma,
300 unsigned long page)
302 leon_flush_tlb_all();
305 static void leon_flush_tlb_range(struct vm_area_struct *vma,
306 unsigned long start,
307 unsigned long end)
309 leon_flush_tlb_all();
312 static void leon_flush_page_to_ram(unsigned long page)
314 leon_flush_cache_all();
317 static void leon_flush_sig_insns(struct mm_struct *mm, unsigned long page)
319 leon_flush_cache_all();
322 static void leon_flush_page_for_dma(unsigned long page)
324 leon_flush_dcache_all();
327 void __init poke_leonsparc(void)
331 static const struct sparc32_cachetlb_ops leon_ops = {
332 .cache_all = leon_flush_cache_all,
333 .cache_mm = leon_flush_cache_mm,
334 .cache_page = leon_flush_cache_page,
335 .cache_range = leon_flush_cache_range,
336 .tlb_all = leon_flush_tlb_all,
337 .tlb_mm = leon_flush_tlb_mm,
338 .tlb_page = leon_flush_tlb_page,
339 .tlb_range = leon_flush_tlb_range,
340 .page_to_ram = leon_flush_page_to_ram,
341 .sig_insns = leon_flush_sig_insns,
342 .page_for_dma = leon_flush_page_for_dma,
345 void __init init_leon(void)
347 srmmu_name = "LEON";
348 sparc32_cachetlb_ops = &leon_ops;
349 poke_srmmu = poke_leonsparc;
351 leon_flush_during_switch = leon_flush_needed();