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Diffstat (limited to 'arch/blackfin/mm/isram-driver.c')
-rw-r--r--arch/blackfin/mm/isram-driver.c236
1 files changed, 218 insertions, 18 deletions
diff --git a/arch/blackfin/mm/isram-driver.c b/arch/blackfin/mm/isram-driver.c
index c080e70f98b0..84cdc5a1c139 100644
--- a/arch/blackfin/mm/isram-driver.c
+++ b/arch/blackfin/mm/isram-driver.c
@@ -1,21 +1,13 @@
/*
- * Description: Instruction SRAM accessor functions for the Blackfin
+ * Instruction SRAM accessor functions for the Blackfin
*
* Copyright 2008 Analog Devices Inc.
*
- * Bugs: Enter bugs at http://blackfin.uclinux.org/
- *
- * 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.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, see the file COPYING, or write
- * to the Free Software Foundation, Inc.,
- * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ * Licensed under the GPL-2 or later
*/
+#define pr_fmt(fmt) "isram: " fmt
+
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
@@ -23,6 +15,7 @@
#include <linux/sched.h>
#include <asm/blackfin.h>
+#include <asm/dma.h>
/*
* IMPORTANT WARNING ABOUT THESE FUNCTIONS
@@ -50,10 +43,12 @@ static DEFINE_SPINLOCK(dtest_lock);
#define IADDR2DTEST(x) \
({ unsigned long __addr = (unsigned long)(x); \
(__addr & 0x47F8) | /* address bits 14 & 10:3 */ \
+ (__addr & 0x8000) << 23 | /* Bank A/B */ \
(__addr & 0x0800) << 15 | /* address bit 11 */ \
- (__addr & 0x3000) << 4 | /* address bits 13:12 */ \
- (__addr & 0x8000) << 8 | /* address bit 15 */ \
- (0x1000004); /* isram access */ \
+ (__addr & 0x3000) << 4 | /* address bits 13:12 */ \
+ (__addr & 0x8000) << 8 | /* address bit 15 */ \
+ (0x1000000) | /* instruction access = 1 */ \
+ (0x4); /* data array = 1 */ \
})
/* Takes a pointer, and returns the offset (in bits) which things should be shifted */
@@ -70,7 +65,7 @@ static void isram_write(const void *addr, uint64_t data)
if (addr >= (void *)(L1_CODE_START + L1_CODE_LENGTH))
return;
- cmd = IADDR2DTEST(addr) | 1; /* write */
+ cmd = IADDR2DTEST(addr) | 2; /* write */
/*
* Writes to DTEST_DATA[0:1] need to be atomic with write to DTEST_COMMAND
@@ -127,8 +122,7 @@ static bool isram_check_addr(const void *addr, size_t n)
(addr < (void *)(L1_CODE_START + L1_CODE_LENGTH))) {
if ((addr + n) > (void *)(L1_CODE_START + L1_CODE_LENGTH)) {
show_stack(NULL, NULL);
- printk(KERN_ERR "isram_memcpy: copy involving %p length "
- "(%zu) too long\n", addr, n);
+ pr_err("copy involving %p length (%zu) too long\n", addr, n);
}
return true;
}
@@ -199,3 +193,209 @@ void *isram_memcpy(void *dest, const void *src, size_t n)
}
EXPORT_SYMBOL(isram_memcpy);
+#ifdef CONFIG_BFIN_ISRAM_SELF_TEST
+
+#define TEST_LEN 0x100
+
+static __init void hex_dump(unsigned char *buf, int len)
+{
+ while (len--)
+ pr_cont("%02x", *buf++);
+}
+
+static __init int isram_read_test(char *sdram, void *l1inst)
+{
+ int i, ret = 0;
+ uint64_t data1, data2;
+
+ pr_info("INFO: running isram_read tests\n");
+
+ /* setup some different data to play with */
+ for (i = 0; i < TEST_LEN; ++i)
+ sdram[i] = i;
+ dma_memcpy(l1inst, sdram, TEST_LEN);
+
+ /* make sure we can read the L1 inst */
+ for (i = 0; i < TEST_LEN; i += sizeof(uint64_t)) {
+ data1 = isram_read(l1inst + i);
+ memcpy(&data2, sdram + i, sizeof(data2));
+ if (memcmp(&data1, &data2, sizeof(uint64_t))) {
+ pr_err("FAIL: isram_read(%p) returned %#llx but wanted %#llx\n",
+ l1inst + i, data1, data2);
+ ++ret;
+ }
+ }
+
+ return ret;
+}
+
+static __init int isram_write_test(char *sdram, void *l1inst)
+{
+ int i, ret = 0;
+ uint64_t data1, data2;
+
+ pr_info("INFO: running isram_write tests\n");
+
+ /* setup some different data to play with */
+ memset(sdram, 0, TEST_LEN * 2);
+ dma_memcpy(l1inst, sdram, TEST_LEN);
+ for (i = 0; i < TEST_LEN; ++i)
+ sdram[i] = i;
+
+ /* make sure we can write the L1 inst */
+ for (i = 0; i < TEST_LEN; i += sizeof(uint64_t)) {
+ memcpy(&data1, sdram + i, sizeof(data1));
+ isram_write(l1inst + i, data1);
+ data2 = isram_read(l1inst + i);
+ if (memcmp(&data1, &data2, sizeof(uint64_t))) {
+ pr_err("FAIL: isram_write(%p, %#llx) != %#llx\n",
+ l1inst + i, data1, data2);
+ ++ret;
+ }
+ }
+
+ dma_memcpy(sdram + TEST_LEN, l1inst, TEST_LEN);
+ if (memcmp(sdram, sdram + TEST_LEN, TEST_LEN)) {
+ pr_err("FAIL: isram_write() did not work properly\n");
+ ++ret;
+ }
+
+ return ret;
+}
+
+static __init int
+_isram_memcpy_test(char pattern, void *sdram, void *l1inst, const char *smemcpy,
+ void *(*fmemcpy)(void *, const void *, size_t))
+{
+ memset(sdram, pattern, TEST_LEN);
+ fmemcpy(l1inst, sdram, TEST_LEN);
+ fmemcpy(sdram + TEST_LEN, l1inst, TEST_LEN);
+ if (memcmp(sdram, sdram + TEST_LEN, TEST_LEN)) {
+ pr_err("FAIL: %s(%p <=> %p, %#x) failed (data is %#x)\n",
+ smemcpy, l1inst, sdram, TEST_LEN, pattern);
+ return 1;
+ }
+ return 0;
+}
+#define _isram_memcpy_test(a, b, c, d) _isram_memcpy_test(a, b, c, #d, d)
+
+static __init int isram_memcpy_test(char *sdram, void *l1inst)
+{
+ int i, j, thisret, ret = 0;
+
+ /* check broad isram_memcpy() */
+ pr_info("INFO: running broad isram_memcpy tests\n");
+ for (i = 0xf; i >= 0; --i)
+ ret += _isram_memcpy_test(i, sdram, l1inst, isram_memcpy);
+
+ /* check read of small, unaligned, and hardware 64bit limits */
+ pr_info("INFO: running isram_memcpy (read) tests\n");
+
+ for (i = 0; i < TEST_LEN; ++i)
+ sdram[i] = i;
+ dma_memcpy(l1inst, sdram, TEST_LEN);
+
+ thisret = 0;
+ for (i = 0; i < TEST_LEN - 32; ++i) {
+ unsigned char cmp[32];
+ for (j = 1; j <= 32; ++j) {
+ memset(cmp, 0, sizeof(cmp));
+ isram_memcpy(cmp, l1inst + i, j);
+ if (memcmp(cmp, sdram + i, j)) {
+ pr_err("FAIL: %p:", l1inst + 1);
+ hex_dump(cmp, j);
+ pr_cont(" SDRAM:");
+ hex_dump(sdram + i, j);
+ pr_cont("\n");
+ if (++thisret > 20) {
+ pr_err("FAIL: skipping remaining series\n");
+ i = TEST_LEN;
+ break;
+ }
+ }
+ }
+ }
+ ret += thisret;
+
+ /* check write of small, unaligned, and hardware 64bit limits */
+ pr_info("INFO: running isram_memcpy (write) tests\n");
+
+ memset(sdram + TEST_LEN, 0, TEST_LEN);
+ dma_memcpy(l1inst, sdram + TEST_LEN, TEST_LEN);
+
+ thisret = 0;
+ for (i = 0; i < TEST_LEN - 32; ++i) {
+ unsigned char cmp[32];
+ for (j = 1; j <= 32; ++j) {
+ isram_memcpy(l1inst + i, sdram + i, j);
+ dma_memcpy(cmp, l1inst + i, j);
+ if (memcmp(cmp, sdram + i, j)) {
+ pr_err("FAIL: %p:", l1inst + i);
+ hex_dump(cmp, j);
+ pr_cont(" SDRAM:");
+ hex_dump(sdram + i, j);
+ pr_cont("\n");
+ if (++thisret > 20) {
+ pr_err("FAIL: skipping remaining series\n");
+ i = TEST_LEN;
+ break;
+ }
+ }
+ }
+ }
+ ret += thisret;
+
+ return ret;
+}
+
+static __init int isram_test_init(void)
+{
+ int ret;
+ char *sdram;
+ void *l1inst;
+
+ sdram = kmalloc(TEST_LEN * 2, GFP_KERNEL);
+ if (!sdram) {
+ pr_warning("SKIP: could not allocate sdram\n");
+ return 0;
+ }
+
+ l1inst = l1_inst_sram_alloc(TEST_LEN);
+ if (!l1inst) {
+ kfree(sdram);
+ pr_warning("SKIP: could not allocate L1 inst\n");
+ return 0;
+ }
+
+ /* sanity check initial L1 inst state */
+ ret = 1;
+ pr_info("INFO: running initial dma_memcpy checks\n");
+ if (_isram_memcpy_test(0xa, sdram, l1inst, dma_memcpy))
+ goto abort;
+ if (_isram_memcpy_test(0x5, sdram, l1inst, dma_memcpy))
+ goto abort;
+
+ ret = 0;
+ ret += isram_read_test(sdram, l1inst);
+ ret += isram_write_test(sdram, l1inst);
+ ret += isram_memcpy_test(sdram, l1inst);
+
+ abort:
+ sram_free(l1inst);
+ kfree(sdram);
+
+ if (ret)
+ return -EIO;
+
+ pr_info("PASS: all tests worked !\n");
+ return 0;
+}
+late_initcall(isram_test_init);
+
+static __exit void isram_test_exit(void)
+{
+ /* stub to allow unloading */
+}
+module_exit(isram_test_exit);
+
+#endif
generated by cgit v1.2.3 (git 2.0.4) at 2024-04-24 01:24:25 +0000