Release 4.7 drivers/mtd/maps/dc21285.c
/*
* MTD map driver for flash on the DC21285 (the StrongARM-110 companion chip)
*
* (C) 2000 Nicolas Pitre <nico@fluxnic.net>
*
* This code is GPL
*/
#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/map.h>
#include <linux/mtd/partitions.h>
#include <asm/io.h>
#include <asm/hardware/dec21285.h>
#include <asm/mach-types.h>
static struct mtd_info *dc21285_mtd;
#ifdef CONFIG_ARCH_NETWINDER
/*
* This is really ugly, but it seams to be the only
* realiable way to do it, as the cpld state machine
* is unpredictible. So we have a 25us penalty per
* write access.
*/
static void nw_en_write(void)
{
unsigned long flags;
/*
* we want to write a bit pattern XXX1 to Xilinx to enable
* the write gate, which will be open for about the next 2ms.
*/
raw_spin_lock_irqsave(&nw_gpio_lock, flags);
nw_cpld_modify(CPLD_FLASH_WR_ENABLE, CPLD_FLASH_WR_ENABLE);
raw_spin_unlock_irqrestore(&nw_gpio_lock, flags);
/*
* let the ISA bus to catch on...
*/
udelay(25);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| david woodhouse | david woodhouse | 35 | 83.33% | 1 | 33.33% |
| russell king | russell king | 5 | 11.90% | 1 | 33.33% |
| uwe kleine-koenig | uwe kleine-koenig | 2 | 4.76% | 1 | 33.33% |
| Total | 42 | 100.00% | 3 | 100.00% |
#else
#define nw_en_write() do { } while (0)
#endif
static map_word dc21285_read8(struct map_info *map, unsigned long ofs)
{
map_word val;
val.x[0] = *(uint8_t*)(map->virt + ofs);
return val;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| linus torvalds | linus torvalds | 24 | 58.54% | 1 | 33.33% |
| russell king | russell king | 14 | 34.15% | 1 | 33.33% |
| david woodhouse | david woodhouse | 3 | 7.32% | 1 | 33.33% |
| Total | 41 | 100.00% | 3 | 100.00% |
static map_word dc21285_read16(struct map_info *map, unsigned long ofs)
{
map_word val;
val.x[0] = *(uint16_t*)(map->virt + ofs);
return val;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| linus torvalds | linus torvalds | 24 | 58.54% | 1 | 33.33% |
| russell king | russell king | 14 | 34.15% | 1 | 33.33% |
| david woodhouse | david woodhouse | 3 | 7.32% | 1 | 33.33% |
| Total | 41 | 100.00% | 3 | 100.00% |
static map_word dc21285_read32(struct map_info *map, unsigned long ofs)
{
map_word val;
val.x[0] = *(uint32_t*)(map->virt + ofs);
return val;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| linus torvalds | linus torvalds | 24 | 58.54% | 1 | 33.33% |
| russell king | russell king | 14 | 34.15% | 1 | 33.33% |
| david woodhouse | david woodhouse | 3 | 7.32% | 1 | 33.33% |
| Total | 41 | 100.00% | 3 | 100.00% |
static void dc21285_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len)
{
memcpy(to, (void*)(map->virt + from), len);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| linus torvalds | linus torvalds | 39 | 95.12% | 1 | 33.33% |
| russell king | russell king | 1 | 2.44% | 1 | 33.33% |
| david woodhouse | david woodhouse | 1 | 2.44% | 1 | 33.33% |
| Total | 41 | 100.00% | 3 | 100.00% |
static void dc21285_write8(struct map_info *map, const map_word d, unsigned long adr)
{
if (machine_is_netwinder())
nw_en_write();
*CSR_ROMWRITEREG = adr & 3;
adr &= ~3;
*(uint8_t*)(map->virt + adr) = d.x[0];
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| linus torvalds | linus torvalds | 38 | 64.41% | 1 | 25.00% |
| david woodhouse | david woodhouse | 16 | 27.12% | 1 | 25.00% |
| russell king | russell king | 5 | 8.47% | 2 | 50.00% |
| Total | 59 | 100.00% | 4 | 100.00% |
static void dc21285_write16(struct map_info *map, const map_word d, unsigned long adr)
{
if (machine_is_netwinder())
nw_en_write();
*CSR_ROMWRITEREG = adr & 3;
adr &= ~3;
*(uint16_t*)(map->virt + adr) = d.x[0];
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| linus torvalds | linus torvalds | 38 | 64.41% | 1 | 25.00% |
| david woodhouse | david woodhouse | 16 | 27.12% | 1 | 25.00% |
| russell king | russell king | 5 | 8.47% | 2 | 50.00% |
| Total | 59 | 100.00% | 4 | 100.00% |
static void dc21285_write32(struct map_info *map, const map_word d, unsigned long adr)
{
if (machine_is_netwinder())
nw_en_write();
*(uint32_t*)(map->virt + adr) = d.x[0];
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| linus torvalds | linus torvalds | 29 | 61.70% | 1 | 33.33% |
| david woodhouse | david woodhouse | 16 | 34.04% | 1 | 33.33% |
| russell king | russell king | 2 | 4.26% | 1 | 33.33% |
| Total | 47 | 100.00% | 3 | 100.00% |
static void dc21285_copy_to_32(struct map_info *map, unsigned long to, const void *from, ssize_t len)
{
while (len > 0) {
map_word d;
d.x[0] = *((uint32_t*)from);
dc21285_write32(map, d, to);
from += 4;
to += 4;
len -= 4;
}
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| linus torvalds | linus torvalds | 53 | 74.65% | 1 | 25.00% |
| russell king | russell king | 10 | 14.08% | 1 | 25.00% |
| martin michlmayr | martin michlmayr | 4 | 5.63% | 1 | 25.00% |
| david woodhouse | david woodhouse | 4 | 5.63% | 1 | 25.00% |
| Total | 71 | 100.00% | 4 | 100.00% |
static void dc21285_copy_to_16(struct map_info *map, unsigned long to, const void *from, ssize_t len)
{
while (len > 0) {
map_word d;
d.x[0] = *((uint16_t*)from);
dc21285_write16(map, d, to);
from += 2;
to += 2;
len -= 2;
}
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| linus torvalds | linus torvalds | 33 | 46.48% | 1 | 25.00% |
| david woodhouse | david woodhouse | 24 | 33.80% | 1 | 25.00% |
| russell king | russell king | 10 | 14.08% | 1 | 25.00% |
| martin michlmayr | martin michlmayr | 4 | 5.63% | 1 | 25.00% |
| Total | 71 | 100.00% | 4 | 100.00% |
static void dc21285_copy_to_8(struct map_info *map, unsigned long to, const void *from, ssize_t len)
{
map_word d;
d.x[0] = *((uint8_t*)from);
dc21285_write8(map, d, to);
from++;
to++;
len--;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| linus torvalds | linus torvalds | 26 | 43.33% | 1 | 25.00% |
| david woodhouse | david woodhouse | 21 | 35.00% | 1 | 25.00% |
| russell king | russell king | 10 | 16.67% | 1 | 25.00% |
| martin michlmayr | martin michlmayr | 3 | 5.00% | 1 | 25.00% |
| Total | 60 | 100.00% | 4 | 100.00% |
static struct map_info dc21285_map = {
.name = "DC21285 flash",
.phys = NO_XIP,
.size = 16*1024*1024,
.copy_from = dc21285_copy_from,
};
/* Partition stuff */
static const char * const probes[] = { "RedBoot", "cmdlinepart", NULL };
static int __init init_dc21285(void)
{
/* Determine bankwidth */
switch (*CSR_SA110_CNTL & (3<<14)) {
case SA110_CNTL_ROMWIDTH_8:
dc21285_map.bankwidth = 1;
dc21285_map.read = dc21285_read8;
dc21285_map.write = dc21285_write8;
dc21285_map.copy_to = dc21285_copy_to_8;
break;
case SA110_CNTL_ROMWIDTH_16:
dc21285_map.bankwidth = 2;
dc21285_map.read = dc21285_read16;
dc21285_map.write = dc21285_write16;
dc21285_map.copy_to = dc21285_copy_to_16;
break;
case SA110_CNTL_ROMWIDTH_32:
dc21285_map.bankwidth = 4;
dc21285_map.read = dc21285_read32;
dc21285_map.write = dc21285_write32;
dc21285_map.copy_to = dc21285_copy_to_32;
break;
default:
printk (KERN_ERR "DC21285 flash: undefined bankwidth\n");
return -ENXIO;
}
printk (KERN_NOTICE "DC21285 flash support (%d-bit bankwidth)\n",
dc21285_map.bankwidth*8);
/* Let's map the flash area */
dc21285_map.virt = ioremap(DC21285_FLASH, 16*1024*1024);
if (!dc21285_map.virt) {
printk("Failed to ioremap\n");
return -EIO;
}
if (machine_is_ebsa285()) {
dc21285_mtd = do_map_probe("cfi_probe", &dc21285_map);
} else {
dc21285_mtd = do_map_probe("jedec_probe", &dc21285_map);
}
if (!dc21285_mtd) {
iounmap(dc21285_map.virt);
return -ENXIO;
}
dc21285_mtd->owner = THIS_MODULE;
mtd_device_parse_register(dc21285_mtd, probes, NULL, NULL, 0);
if(machine_is_ebsa285()) {
/*
* Flash timing is determined with bits 19-16 of the
* CSR_SA110_CNTL. The value is the number of wait cycles, or
* 0 for 16 cycles (the default). Cycles are 20 ns.
* Here we use 7 for 140 ns flash chips.
*/
/* access time */
*CSR_SA110_CNTL = ((*CSR_SA110_CNTL & ~0x000f0000) | (7 << 16));
/* burst time */
*CSR_SA110_CNTL = ((*CSR_SA110_CNTL & ~0x00f00000) | (7 << 20));
/* tristate time */
*CSR_SA110_CNTL = ((*CSR_SA110_CNTL & ~0x0f000000) | (7 << 24));
}
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| david woodhouse | david woodhouse | 165 | 54.64% | 2 | 20.00% |
| linus torvalds | linus torvalds | 123 | 40.73% | 2 | 20.00% |
| russell king | russell king | 9 | 2.98% | 3 | 30.00% |
| dmitry eremin-baryshkov | dmitry eremin-baryshkov | 3 | 0.99% | 1 | 10.00% |
| thomas gleixner | thomas gleixner | 1 | 0.33% | 1 | 10.00% |
| artem bityutskiy | artem bityutskiy | 1 | 0.33% | 1 | 10.00% |
| Total | 302 | 100.00% | 10 | 100.00% |
static void __exit cleanup_dc21285(void)
{
mtd_device_unregister(dc21285_mtd);
map_destroy(dc21285_mtd);
iounmap(dc21285_map.virt);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| linus torvalds | linus torvalds | 19 | 73.08% | 1 | 20.00% |
| david woodhouse | david woodhouse | 5 | 19.23% | 2 | 40.00% |
| jamie iles | jamie iles | 1 | 3.85% | 1 | 20.00% |
| russell king | russell king | 1 | 3.85% | 1 | 20.00% |
| Total | 26 | 100.00% | 5 | 100.00% |
module_init(init_dc21285);
module_exit(cleanup_dc21285);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Nicolas Pitre <nico@fluxnic.net>");
MODULE_DESCRIPTION("MTD map driver for DC21285 boards");
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| linus torvalds | linus torvalds | 542 | 52.62% | 2 | 11.11% |
| david woodhouse | david woodhouse | 353 | 34.27% | 2 | 11.11% |
| russell king | russell king | 103 | 10.00% | 4 | 22.22% |
| martin michlmayr | martin michlmayr | 11 | 1.07% | 1 | 5.56% |
| art haas | art haas | 6 | 0.58% | 1 | 5.56% |
| tim schmielau | tim schmielau | 3 | 0.29% | 1 | 5.56% |
| dmitry eremin-baryshkov | dmitry eremin-baryshkov | 3 | 0.29% | 1 | 5.56% |
| artem bityutskiy | artem bityutskiy | 2 | 0.19% | 2 | 11.11% |
| nicolas pitre | nicolas pitre | 2 | 0.19% | 1 | 5.56% |
| thomas gleixner | thomas gleixner | 2 | 0.19% | 1 | 5.56% |
| uwe kleine-koenig | uwe kleine-koenig | 2 | 0.19% | 1 | 5.56% |
| jamie iles | jamie iles | 1 | 0.10% | 1 | 5.56% |
| Total | 1030 | 100.00% | 18 | 100.00% |
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