diff options
Diffstat (limited to 'qemu/roms/u-boot/drivers/mtd/spi/ramtron.c')
| -rw-r--r-- | qemu/roms/u-boot/drivers/mtd/spi/ramtron.c | 403 |
1 files changed, 403 insertions, 0 deletions
diff --git a/qemu/roms/u-boot/drivers/mtd/spi/ramtron.c b/qemu/roms/u-boot/drivers/mtd/spi/ramtron.c new file mode 100644 index 000000000..d50da37c8 --- /dev/null +++ b/qemu/roms/u-boot/drivers/mtd/spi/ramtron.c @@ -0,0 +1,403 @@ +/* + * (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_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); +} |