2 * Copyright (C) 1996 David S. Miller (dm@engr.sgi.com)
3 * Copyright (C) 1997, 2001 Ralf Baechle (ralf@gnu.org)
4 * Copyright (C) 2000 SiByte, Inc.
5 * Copyright (C) 2005 Thiemo Seufer
7 * Written by Justin Carlson of SiByte, Inc.
8 * and Kip Walker of Broadcom Corp.
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License
13 * as published by the Free Software Foundation; either version 2
14 * of the License, or (at your option) any later version.
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
25 #include <linux/config.h>
26 #include <linux/module.h>
27 #include <linux/sched.h>
28 #include <linux/smp.h>
31 #include <asm/sibyte/sb1250.h>
32 #include <asm/sibyte/sb1250_regs.h>
33 #include <asm/sibyte/sb1250_dma.h>
35 #ifdef CONFIG_SB1_PASS_1_WORKAROUNDS
36 #define SB1_PREF_LOAD_STREAMED_HINT "0"
37 #define SB1_PREF_STORE_STREAMED_HINT "1"
39 #define SB1_PREF_LOAD_STREAMED_HINT "4"
40 #define SB1_PREF_STORE_STREAMED_HINT "5"
43 static inline void clear_page_cpu(void *page)
45 unsigned char *addr = (unsigned char *) page;
46 unsigned char *end = addr + PAGE_SIZE;
49 * JDCXXX - This should be bottlenecked by the write buffer, but these
50 * things tend to be mildly unpredictable...should check this on the
53 * We prefetch 4 lines ahead. We're also "cheating" slightly here...
54 * since we know we're on an SB1, we force the assembler to take
55 * 64-bit operands to speed things up
61 #ifdef CONFIG_CPU_HAS_PREFETCH
62 " daddiu %0, %0, 128 \n"
63 " pref " SB1_PREF_STORE_STREAMED_HINT ", -128(%0) \n"
64 /* Prefetch the first 4 lines */
65 " pref " SB1_PREF_STORE_STREAMED_HINT ", -96(%0) \n"
66 " pref " SB1_PREF_STORE_STREAMED_HINT ", -64(%0) \n"
67 " pref " SB1_PREF_STORE_STREAMED_HINT ", -32(%0) \n"
68 "1: sd $0, -128(%0) \n" /* Throw out a cacheline of 0's */
72 " daddiu %0, %0, 32 \n"
74 " pref " SB1_PREF_STORE_STREAMED_HINT ", -32(%0) \n"
75 " daddiu %0, %0, -128 \n"
77 " sd $0, 0(%0) \n" /* Throw out a cacheline of 0's */
81 " daddiu %0, %0, 32 \n"
90 static inline void copy_page_cpu(void *to, void *from)
92 unsigned char *src = (unsigned char *)from;
93 unsigned char *dst = (unsigned char *)to;
94 unsigned char *end = src + PAGE_SIZE;
97 * The pref's used here are using "streaming" hints, which cause the
98 * copied data to be kicked out of the cache sooner. A page copy often
99 * ends up copying a lot more data than is commonly used, so this seems
100 * to make sense in terms of reducing cache pollution, but I've no real
101 * performance data to back this up
103 __asm__ __volatile__(
107 #ifdef CONFIG_CPU_HAS_PREFETCH
108 " daddiu %0, %0, 128 \n"
109 " daddiu %1, %1, 128 \n"
110 " pref " SB1_PREF_LOAD_STREAMED_HINT ", -128(%0)\n"
111 /* Prefetch the first 4 lines */
112 " pref " SB1_PREF_STORE_STREAMED_HINT ", -128(%1)\n"
113 " pref " SB1_PREF_LOAD_STREAMED_HINT ", -96(%0)\n"
114 " pref " SB1_PREF_STORE_STREAMED_HINT ", -96(%1)\n"
115 " pref " SB1_PREF_LOAD_STREAMED_HINT ", -64(%0)\n"
116 " pref " SB1_PREF_STORE_STREAMED_HINT ", -64(%1)\n"
117 " pref " SB1_PREF_LOAD_STREAMED_HINT ", -32(%0)\n"
118 "1: pref " SB1_PREF_STORE_STREAMED_HINT ", -32(%1)\n"
120 " ld $8, -128(%0) \n" /* Block copy a cacheline */
121 " ld $9, -120(%0) \n"
122 " ld $10, -112(%0) \n"
123 " ld $11, -104(%0) \n"
124 " sd $8, -128(%1) \n"
125 " sd $9, -120(%1) \n"
126 " sd $10, -112(%1) \n"
127 " sd $11, -104(%1) \n"
129 " lw $2, -128(%0) \n" /* Block copy a cacheline */
130 " lw $3, -124(%0) \n"
131 " lw $6, -120(%0) \n"
132 " lw $7, -116(%0) \n"
133 " lw $8, -112(%0) \n"
134 " lw $9, -108(%0) \n"
135 " lw $10, -104(%0) \n"
136 " lw $11, -100(%0) \n"
137 " sw $2, -128(%1) \n"
138 " sw $3, -124(%1) \n"
139 " sw $6, -120(%1) \n"
140 " sw $7, -116(%1) \n"
141 " sw $8, -112(%1) \n"
142 " sw $9, -108(%1) \n"
143 " sw $10, -104(%1) \n"
144 " sw $11, -100(%1) \n"
146 " daddiu %0, %0, 32 \n"
147 " daddiu %1, %1, 32 \n"
148 " bnel %0, %2, 1b \n"
149 " pref " SB1_PREF_LOAD_STREAMED_HINT ", -32(%0)\n"
150 " daddiu %0, %0, -128 \n"
151 " daddiu %1, %1, -128 \n"
154 " ld $8, 0(%0) \n" /* Block copy a cacheline */
163 " lw $2, 0(%0) \n" /* Block copy a cacheline */
180 " daddiu %0, %0, 32 \n"
181 " daddiu %1, %1, 32 \n"
182 " bnel %0, %2, 1b \n"
189 : "+r" (src), "+r" (dst)
192 : "$8","$9","$10","$11","memory");
194 : "$2","$3","$6","$7","$8","$9","$10","$11","memory");
199 #ifdef CONFIG_SIBYTE_DMA_PAGEOPS
202 * Pad descriptors to cacheline, since each is exclusively owned by a
205 typedef struct dmadscr_s {
212 static dmadscr_t page_descr[DM_NUM_CHANNELS]
213 __attribute__((aligned(SMP_CACHE_BYTES)));
215 void sb1_dma_init(void)
219 for (i = 0; i < DM_NUM_CHANNELS; i++) {
220 const u64 base_val = CPHYSADDR(&page_descr[i]) |
221 V_DM_DSCR_BASE_RINGSZ(1);
222 volatile void *base_reg =
223 IOADDR(A_DM_REGISTER(i, R_DM_DSCR_BASE));
225 __raw_writeq(base_val, base_reg);
226 __raw_writeq(base_val | M_DM_DSCR_BASE_RESET, base_reg);
227 __raw_writeq(base_val | M_DM_DSCR_BASE_ENABL, base_reg);
231 void clear_page(void *page)
233 u64 to_phys = CPHYSADDR(page);
234 unsigned int cpu = smp_processor_id();
236 /* if the page is not in KSEG0, use old way */
237 if ((long)KSEGX(page) != (long)CKSEG0)
238 return clear_page_cpu(page);
240 page_descr[cpu].dscr_a = to_phys | M_DM_DSCRA_ZERO_MEM |
241 M_DM_DSCRA_L2C_DEST | M_DM_DSCRA_INTERRUPT;
242 page_descr[cpu].dscr_b = V_DM_DSCRB_SRC_LENGTH(PAGE_SIZE);
243 __raw_writeq(1, IOADDR(A_DM_REGISTER(cpu, R_DM_DSCR_COUNT)));
246 * Don't really want to do it this way, but there's no
247 * reliable way to delay completion detection.
249 while (!(__raw_readq(IOADDR(A_DM_REGISTER(cpu, R_DM_DSCR_BASE_DEBUG)))
250 & M_DM_DSCR_BASE_INTERRUPT))
252 __raw_readq(IOADDR(A_DM_REGISTER(cpu, R_DM_DSCR_BASE)));
255 void copy_page(void *to, void *from)
257 u64 from_phys = CPHYSADDR(from);
258 u64 to_phys = CPHYSADDR(to);
259 unsigned int cpu = smp_processor_id();
261 /* if any page is not in KSEG0, use old way */
262 if ((long)KSEGX(to) != (long)CKSEG0
263 || (long)KSEGX(from) != (long)CKSEG0)
264 return copy_page_cpu(to, from);
266 page_descr[cpu].dscr_a = to_phys | M_DM_DSCRA_L2C_DEST |
267 M_DM_DSCRA_INTERRUPT;
268 page_descr[cpu].dscr_b = from_phys | V_DM_DSCRB_SRC_LENGTH(PAGE_SIZE);
269 __raw_writeq(1, IOADDR(A_DM_REGISTER(cpu, R_DM_DSCR_COUNT)));
272 * Don't really want to do it this way, but there's no
273 * reliable way to delay completion detection.
275 while (!(__raw_readq(IOADDR(A_DM_REGISTER(cpu, R_DM_DSCR_BASE_DEBUG)))
276 & M_DM_DSCR_BASE_INTERRUPT))
278 __raw_readq(IOADDR(A_DM_REGISTER(cpu, R_DM_DSCR_BASE)));
281 #else /* !CONFIG_SIBYTE_DMA_PAGEOPS */
283 void clear_page(void *page)
285 return clear_page_cpu(page);
288 void copy_page(void *to, void *from)
290 return copy_page_cpu(to, from);
293 #endif /* !CONFIG_SIBYTE_DMA_PAGEOPS */
295 EXPORT_SYMBOL(clear_page);
296 EXPORT_SYMBOL(copy_page);