diff options
Diffstat (limited to 'drivers/mtd/spi/ramtron.c')
| -rw-r--r-- | drivers/mtd/spi/ramtron.c | 404 |
1 files changed, 0 insertions, 404 deletions
diff --git a/drivers/mtd/spi/ramtron.c b/drivers/mtd/spi/ramtron.c deleted file mode 100644 index a23032c..0000000 --- a/drivers/mtd/spi/ramtron.c +++ /dev/null @@ -1,404 +0,0 @@ -/* - * (C) Copyright 2010 - * Reinhard Meyer, EMK Elektronik, reinhard.meyer@emk-elektronik.de - * - * SPDX-License-Identifier: GPL-2.0+ - */ - -/* - * Note: RAMTRON SPI FRAMs are ferroelectric, nonvolatile RAMs - * with an interface identical to SPI flash devices. - * However since they behave like RAM there are no delays or - * busy polls required. They can sustain read or write at the - * allowed SPI bus speed, which can be 40 MHz for some devices. - * - * Unfortunately some RAMTRON devices do not have a means of - * identifying them. They will leave the SO line undriven when - * the READ-ID command is issued. It is therefore mandatory - * that the MISO line has a proper pull-up, so that READ-ID - * will return a row of 0xff. This 0xff pseudo-id will cause - * probes by all vendor specific functions that are designed - * to handle it. If the MISO line is not pulled up, READ-ID - * could return any random noise, even mimicking another - * device. - * - * We use CONFIG_SPI_FRAM_RAMTRON_NON_JEDEC - * to define which device will be assumed after a simple status - * register verify. This method is prone to false positive - * detection and should therefore be the last to be tried. - * Enter it in the last position in the table in spi_flash.c! - * - * The define CONFIG_SPI_FRAM_RAMTRON_NON_JEDEC both activates - * compilation of the special handler and defines the device - * to assume. - */ - -#include <common.h> -#include <malloc.h> -#include <spi.h> -#include <spi_flash.h> -#include "sf_internal.h" - -/* - * Properties of supported FRAMs - * Note: speed is currently not used because we have no method to deliver that - * value to the upper layers - */ -struct ramtron_spi_fram_params { - u32 size; /* size in bytes */ - u8 addr_len; /* number of address bytes */ - u8 merge_cmd; /* some address bits are in the command byte */ - u8 id1; /* device ID 1 (family, density) */ - u8 id2; /* device ID 2 (sub, rev, rsvd) */ - u32 speed; /* max. SPI clock in Hz */ - const char *name; /* name for display and/or matching */ -}; - -struct ramtron_spi_fram { - struct spi_flash flash; - const struct ramtron_spi_fram_params *params; -}; - -static inline struct ramtron_spi_fram *to_ramtron_spi_fram(struct spi_flash - *flash) -{ - return container_of(flash, struct ramtron_spi_fram, flash); -} - -/* - * table describing supported FRAM chips: - * chips without RDID command must have the values 0xff for id1 and id2 - */ -static const struct ramtron_spi_fram_params ramtron_spi_fram_table[] = { - { - .size = 32*1024, - .addr_len = 2, - .merge_cmd = 0, - .id1 = 0x22, - .id2 = 0x00, - .speed = 40000000, - .name = "FM25V02", - }, - { - .size = 32*1024, - .addr_len = 2, - .merge_cmd = 0, - .id1 = 0x22, - .id2 = 0x01, - .speed = 40000000, - .name = "FM25VN02", - }, - { - .size = 64*1024, - .addr_len = 2, - .merge_cmd = 0, - .id1 = 0x23, - .id2 = 0x00, - .speed = 40000000, - .name = "FM25V05", - }, - { - .size = 64*1024, - .addr_len = 2, - .merge_cmd = 0, - .id1 = 0x23, - .id2 = 0x01, - .speed = 40000000, - .name = "FM25VN05", - }, - { - .size = 128*1024, - .addr_len = 3, - .merge_cmd = 0, - .id1 = 0x24, - .id2 = 0x00, - .speed = 40000000, - .name = "FM25V10", - }, - { - .size = 128*1024, - .addr_len = 3, - .merge_cmd = 0, - .id1 = 0x24, - .id2 = 0x01, - .speed = 40000000, - .name = "FM25VN10", - }, -#ifdef CONFIG_SPI_FRAM_RAMTRON_NON_JEDEC - { - .size = 256*1024, - .addr_len = 3, - .merge_cmd = 0, - .id1 = 0xff, - .id2 = 0xff, - .speed = 40000000, - .name = "FM25H20", - }, -#endif -}; - -static int ramtron_common(struct spi_flash *flash, - u32 offset, size_t len, void *buf, u8 command) -{ - struct ramtron_spi_fram *sn = to_ramtron_spi_fram(flash); - u8 cmd[4]; - int cmd_len; - int ret; - - if (sn->params->addr_len == 3 && sn->params->merge_cmd == 0) { - cmd[0] = command; - cmd[1] = offset >> 16; - cmd[2] = offset >> 8; - cmd[3] = offset; - cmd_len = 4; - } else if (sn->params->addr_len == 2 && sn->params->merge_cmd == 0) { - cmd[0] = command; - cmd[1] = offset >> 8; - cmd[2] = offset; - cmd_len = 3; - } else { - printf("SF: unsupported addr_len or merge_cmd\n"); - return -1; - } - - /* claim the bus */ - ret = spi_claim_bus(flash->spi); - if (ret) { - debug("SF: Unable to claim SPI bus\n"); - return ret; - } - - if (command == CMD_PAGE_PROGRAM) { - /* send WREN */ - ret = spi_flash_cmd_write_enable(flash); - if (ret < 0) { - debug("SF: Enabling Write failed\n"); - goto releasebus; - } - } - - /* do the transaction */ - if (command == CMD_PAGE_PROGRAM) - ret = spi_flash_cmd_write(flash->spi, cmd, cmd_len, buf, len); - else - ret = spi_flash_cmd_read(flash->spi, cmd, cmd_len, buf, len); - if (ret < 0) - debug("SF: Transaction failed\n"); - -releasebus: - /* release the bus */ - spi_release_bus(flash->spi); - return ret; -} - -static int ramtron_read(struct spi_flash *flash, - u32 offset, size_t len, void *buf) -{ - return ramtron_common(flash, offset, len, buf, - CMD_READ_ARRAY_SLOW); -} - -static int ramtron_write(struct spi_flash *flash, - u32 offset, size_t len, const void *buf) -{ - return ramtron_common(flash, offset, len, (void *)buf, - CMD_PAGE_PROGRAM); -} - -static int ramtron_erase(struct spi_flash *flash, u32 offset, size_t len) -{ - debug("SF: Erase of RAMTRON FRAMs is pointless\n"); - return -1; -} - -/* - * nore: we are called here with idcode pointing to the first non-0x7f byte - * already! - */ -static struct spi_flash *spi_fram_probe_ramtron(struct spi_slave *spi, - u8 *idcode) -{ - const struct ramtron_spi_fram_params *params; - struct ramtron_spi_fram *sn; - unsigned int i; -#ifdef CONFIG_SPI_FRAM_RAMTRON_NON_JEDEC - int ret; - u8 sr; -#endif - - /* NOTE: the bus has been claimed before this function is called! */ - switch (idcode[0]) { - case 0xc2: - /* JEDEC conformant RAMTRON id */ - for (i = 0; i < ARRAY_SIZE(ramtron_spi_fram_table); i++) { - params = &ramtron_spi_fram_table[i]; - if (idcode[1] == params->id1 && - idcode[2] == params->id2) - goto found; - } - break; -#ifdef CONFIG_SPI_FRAM_RAMTRON_NON_JEDEC - case 0xff: - /* - * probably open MISO line, pulled up. - * We COULD have a non JEDEC conformant FRAM here, - * read the status register to verify - */ - ret = spi_flash_cmd(spi, CMD_READ_STATUS, &sr, 1); - if (ret) - return NULL; - - /* Bits 5,4,0 are fixed 0 for all devices */ - if ((sr & 0x31) != 0x00) - return NULL; - /* now find the device */ - for (i = 0; i < ARRAY_SIZE(ramtron_spi_fram_table); i++) { - params = &ramtron_spi_fram_table[i]; - if (!strcmp(params->name, - CONFIG_SPI_FRAM_RAMTRON_NON_JEDEC)) - goto found; - } - debug("SF: Unsupported non-JEDEC RAMTRON device " - CONFIG_SPI_FRAM_RAMTRON_NON_JEDEC "\n"); - break; -#endif - default: - break; - } - - /* arriving here means no method has found a device we can handle */ - debug("SF/ramtron: unsupported device id0=%02x id1=%02x id2=%02x\n", - idcode[0], idcode[1], idcode[2]); - return NULL; - -found: - sn = malloc(sizeof(*sn)); - if (!sn) { - debug("SF: Failed to allocate memory\n"); - return NULL; - } - - sn->params = params; - - sn->flash.write = ramtron_write; - sn->flash.read = ramtron_read; - sn->flash.erase = ramtron_erase; - sn->flash.size = params->size; - - return &sn->flash; -} - -/* - * The following table holds all device probe functions - * (All flashes are removed and implemented a common probe at - * spi_flash_probe.c) - * - * shift: number of continuation bytes before the ID - * idcode: the expected IDCODE or 0xff for non JEDEC devices - * probe: the function to call - * - * Non JEDEC devices should be ordered in the table such that - * the probe functions with best detection algorithms come first. - * - * Several matching entries are permitted, they will be tried - * in sequence until a probe function returns non NULL. - * - * IDCODE_CONT_LEN may be redefined if a device needs to declare a - * larger "shift" value. IDCODE_PART_LEN generally shouldn't be - * changed. This is the max number of bytes probe functions may - * examine when looking up part-specific identification info. - * - * Probe functions will be given the idcode buffer starting at their - * manu id byte (the "idcode" in the table below). In other words, - * all of the continuation bytes will be skipped (the "shift" below). - */ -#define IDCODE_CONT_LEN 0 -#define IDCODE_PART_LEN 5 -static const struct { - const u8 shift; - const u8 idcode; - struct spi_flash *(*probe) (struct spi_slave *spi, u8 *idcode); -} flashes[] = { - /* Keep it sorted by define name */ -#ifdef CONFIG_SPI_FRAM_RAMTRON - { 6, 0xc2, spi_fram_probe_ramtron, }, -# undef IDCODE_CONT_LEN -# define IDCODE_CONT_LEN 6 -#endif -#ifdef CONFIG_SPI_FRAM_RAMTRON_NON_JEDEC - { 0, 0xff, spi_fram_probe_ramtron, }, -#endif -}; -#define IDCODE_LEN (IDCODE_CONT_LEN + IDCODE_PART_LEN) - -struct spi_flash *spi_flash_probe(unsigned int bus, unsigned int cs, - unsigned int max_hz, unsigned int spi_mode) -{ - struct spi_slave *spi; - struct spi_flash *flash = NULL; - int ret, i, shift; - u8 idcode[IDCODE_LEN], *idp; - - spi = spi_setup_slave(bus, cs, max_hz, spi_mode); - if (!spi) { - printf("SF: Failed to set up slave\n"); - return NULL; - } - - ret = spi_claim_bus(spi); - if (ret) { - debug("SF: Failed to claim SPI bus: %d\n", ret); - goto err_claim_bus; - } - - /* Read the ID codes */ - ret = spi_flash_cmd(spi, CMD_READ_ID, idcode, sizeof(idcode)); - if (ret) - goto err_read_id; - -#ifdef DEBUG - printf("SF: Got idcodes\n"); - print_buffer(0, idcode, 1, sizeof(idcode), 0); -#endif - - /* count the number of continuation bytes */ - for (shift = 0, idp = idcode; - shift < IDCODE_CONT_LEN && *idp == 0x7f; - ++shift, ++idp) - continue; - - /* search the table for matches in shift and id */ - for (i = 0; i < ARRAY_SIZE(flashes); ++i) - if (flashes[i].shift == shift && flashes[i].idcode == *idp) { - /* we have a match, call probe */ - flash = flashes[i].probe(spi, idp); - if (flash) - break; - } - - if (!flash) { - printf("SF: Unsupported manufacturer %02x\n", *idp); - goto err_manufacturer_probe; - } - - printf("SF: Detected %s with total size ", flash->name); - print_size(flash->size, ""); - puts("\n"); - - spi_release_bus(spi); - - return flash; - -err_manufacturer_probe: -err_read_id: - spi_release_bus(spi); -err_claim_bus: - spi_free_slave(spi); - return NULL; -} - -void spi_flash_free(struct spi_flash *flash) -{ - spi_free_slave(flash->spi); - free(flash); -} |