Convert cfi flash to driver model.
Signed-off-by: Thomas Chou <thomas@wytron.com.tw>
Reviewed-by: Simon Glass <sjg@chromium.org>
--- /dev/null
+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>;
+ };
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"
/* #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>
* 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;
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)
{
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;
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 */
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