cfi_flash: convert to driver model

Convert cfi flash to driver model.

Signed-off-by: Thomas Chou <thomas@wytron.com.tw>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Thomas Chou 2015-11-07 14:31:08 +08:00
parent d85879938d
commit f105691043
3 changed files with 177 additions and 0 deletions

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@ -0,0 +1,88 @@
CFI or JEDEC memory-mapped NOR flash, MTD-RAM (NVRAM...)
Flash chips (Memory Technology Devices) are often used for solid state
file systems on embedded devices.
- compatible : should contain the specific model of mtd chip(s)
used, if known, followed by either "cfi-flash", "jedec-flash",
"mtd-ram" or "mtd-rom".
- reg : Address range(s) of the mtd chip(s)
It's possible to (optionally) define multiple "reg" tuples so that
non-identical chips can be described in one node.
- bank-width : Width (in bytes) of the bank. Equal to the
device width times the number of interleaved chips.
- device-width : (optional) Width of a single mtd chip. If
omitted, assumed to be equal to 'bank-width'.
- #address-cells, #size-cells : Must be present if the device has
sub-nodes representing partitions (see below). In this case
both #address-cells and #size-cells must be equal to 1.
- no-unaligned-direct-access: boolean to disable the default direct
mapping of the flash.
On some platforms (e.g. MPC5200) a direct 1:1 mapping may cause
problems with JFFS2 usage, as the local bus (LPB) doesn't support
unaligned accesses as implemented in the JFFS2 code via memcpy().
By defining "no-unaligned-direct-access", the flash will not be
exposed directly to the MTD users (e.g. JFFS2) any more.
- linux,mtd-name: allow to specify the mtd name for retro capability with
physmap-flash drivers as boot loader pass the mtd partition via the old
device name physmap-flash.
- use-advanced-sector-protection: boolean to enable support for the
advanced sector protection (Spansion: PPB - Persistent Protection
Bits) locking.
For JEDEC compatible devices, the following additional properties
are defined:
- vendor-id : Contains the flash chip's vendor id (1 byte).
- device-id : Contains the flash chip's device id (1 byte).
For ROM compatible devices (and ROM fallback from cfi-flash), the following
additional (optional) property is defined:
- erase-size : The chip's physical erase block size in bytes.
The device tree may optionally contain sub-nodes describing partitions of the
address space. See partition.txt for more detail.
Example:
flash@ff000000 {
compatible = "amd,am29lv128ml", "cfi-flash";
reg = <ff000000 01000000>;
bank-width = <4>;
device-width = <1>;
#address-cells = <1>;
#size-cells = <1>;
fs@0 {
label = "fs";
reg = <0 f80000>;
};
firmware@f80000 {
label ="firmware";
reg = <f80000 80000>;
read-only;
};
};
Here an example with multiple "reg" tuples:
flash@f0000000,0 {
#address-cells = <1>;
#size-cells = <1>;
compatible = "intel,pc48f4400p0vb", "cfi-flash";
reg = <0 0x00000000 0x02000000
0 0x02000000 0x02000000>;
bank-width = <2>;
partition@0 {
label = "test-part1";
reg = <0 0x04000000>;
};
};
An example using SRAM:
sram@2,0 {
compatible = "samsung,k6f1616u6a", "mtd-ram";
reg = <2 0 0x00200000>;
bank-width = <2>;
};

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@ -8,6 +8,17 @@ config MTD
flash, RAM and similar chips, often used for solid state file
systems on embedded devices.
config CFI_FLASH
bool "Enable Driver Model for CFI Flash driver"
depends on MTD
help
The Common Flash Interface specification was developed by Intel,
AMD and other flash manufactures. It provides a universal method
for probing the capabilities of flash devices. If you wish to
support any device that is CFI-compliant, you need to enable this
option. Visit <http://www.amd.com/products/nvd/overview/cfi.html>
for more information on CFI.
endmenu
source "drivers/mtd/nand/Kconfig"

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@ -18,6 +18,9 @@
/* #define DEBUG */
#include <common.h>
#include <dm.h>
#include <errno.h>
#include <fdt_support.h>
#include <asm/processor.h>
#include <asm/io.h>
#include <asm/byteorder.h>
@ -47,6 +50,8 @@
* reading and writing ... (yes there is such a Hardware).
*/
DECLARE_GLOBAL_DATA_PTR;
static uint flash_offset_cfi[2] = { FLASH_OFFSET_CFI, FLASH_OFFSET_CFI_ALT };
#ifdef CONFIG_FLASH_CFI_MTD
static uint flash_verbose = 1;
@ -87,10 +92,36 @@ static u16 cfi_flash_config_reg(int i)
int cfi_flash_num_flash_banks = CONFIG_SYS_MAX_FLASH_BANKS_DETECT;
#endif
#ifdef CONFIG_CFI_FLASH /* for driver model */
static void cfi_flash_init_dm(void)
{
struct udevice *dev;
cfi_flash_num_flash_banks = 0;
/*
* The uclass_first_device() will probe the first device and
* uclass_next_device() will probe the rest if they exist. So
* that cfi_flash_probe() will get called assigning the base
* addresses that are available.
*/
for (uclass_first_device(UCLASS_MTD, &dev);
dev;
uclass_next_device(&dev)) {
}
}
static phys_addr_t cfi_flash_base[CFI_MAX_FLASH_BANKS];
phys_addr_t cfi_flash_bank_addr(int i)
{
return cfi_flash_base[i];
}
#else
__weak phys_addr_t cfi_flash_bank_addr(int i)
{
return ((phys_addr_t [])CONFIG_SYS_FLASH_BANKS_LIST)[i];
}
#endif
__weak unsigned long cfi_flash_bank_size(int i)
{
@ -2322,6 +2353,10 @@ unsigned long flash_init (void)
getenv_f("unlock", s, sizeof(s));
#endif
#ifdef CONFIG_CFI_FLASH /* for driver model */
cfi_flash_init_dm();
#endif
/* Init: no FLASHes known */
for (i = 0; i < CONFIG_SYS_MAX_FLASH_BANKS; ++i) {
flash_info[i].flash_id = FLASH_UNKNOWN;
@ -2398,3 +2433,46 @@ unsigned long flash_init (void)
return (size);
}
#ifdef CONFIG_CFI_FLASH /* for driver model */
static int cfi_flash_probe(struct udevice *dev)
{
void *blob = (void *)gd->fdt_blob;
int node = dev->of_offset;
const fdt32_t *cell;
phys_addr_t addr;
int parent, addrc, sizec;
int len, idx;
parent = fdt_parent_offset(blob, node);
of_bus_default_count_cells(blob, parent, &addrc, &sizec);
/* decode regs, there may be multiple reg tuples. */
cell = fdt_getprop(blob, node, "reg", &len);
if (!cell)
return -ENOENT;
idx = 0;
len /= sizeof(fdt32_t);
while (idx < len) {
addr = fdt_translate_address((void *)blob,
node, cell + idx);
cfi_flash_base[cfi_flash_num_flash_banks++] = addr;
idx += addrc + sizec;
}
gd->bd->bi_flashstart = cfi_flash_base[0];
return 0;
}
static const struct udevice_id cfi_flash_ids[] = {
{ .compatible = "cfi-flash" },
{ .compatible = "jedec-flash" },
{}
};
U_BOOT_DRIVER(cfi_flash) = {
.name = "cfi_flash",
.id = UCLASS_MTD,
.of_match = cfi_flash_ids,
.probe = cfi_flash_probe,
};
#endif /* CONFIG_CFI_FLASH */