From 4352b8aee98005853aa63f57d6377282de17a33f Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Sun, 23 Aug 2026 13:28:57 -0700 Subject: Merge tag 'i3c/for-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linux Pull I3C updates from Alexandre Belloni: "A new driver this cycle, for the AMD AXI I3C controller. There are also new features such as IBI wakeup support, SETAASA device discovery and ACPI support for the the DAA methods, meaning we can now communicate with the SPD devices on DDR5 modules. New driver: - AMD AXI I3C master controller Subsystem: - I3C Common Command Code (CCC) handling improvements, especially around GET CCCs - SETAASA device discovery support - ACPI support for all existing DAA methods like SETDASA, SETNEWDA as well as I2C devices on I3C bus - IBI-based wakeup support Drivers: - dw: SETAASA support - mipi-i3c-hci: advertise IBI wakeup capability, AMD_PT I3C controller support, PIO queue management support for HCI v1.2 - renesas: improve suspend to RAM support, add runtime PM support" * tag 'i3c/for-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linux: (70 commits) i3c: dw: reduce do_daa time if there's no client i3c: mipi-i3c-hci: Add support for AMD_PT I3C controller i3c: mipi-i3c-hci: Add PIO queue management support for HCI v1.2 i3c: mipi-i3c-hci: Fix missing STAT_IBI_STATUS_THLD in PIO mode i3c: dw: rename "pclk" to "apb" to match dt-binding i3c: dw: make struct dw_i3c_cmd smaller i3c: dw: use COMMAND_PORT_TRANSFER_ARG instead of hardcoding i3c: renesas: Don't register devices when ENTDAA times out i3c: master: dw-i3c-master: fix OD timing for first broadcast i3c: mipi-i3c-hci: Advertise IBI wakeup capability i3c: mipi-i3c-hci: Factor out i3c_hci_sysdev() i3c: mipi-i3c-hci-pci: Propagate I3C wakeup requirements to PCI i3c: master: Reject IBI requests from non-IBI-capable devices i3c: master: Add helper to query bus wakeup requirements i3c: master: Report wakeup events for IBIs i3c: master: Support IBI-based wakeup capability i3c: master: Fix potential UAF in i3c_device_match() i3c: master: Fix potential UAF in i3c_device_uevent() i3c: Make dev->desc locking assumptions explicit i3c: master: Fix use-after-free of master->this ... --- drivers/mtd/devices/Kconfig | 227 ++++ drivers/mtd/devices/Makefile | 24 + drivers/mtd/devices/bcm47xxsflash.c | 380 ++++++ drivers/mtd/devices/bcm47xxsflash.h | 81 ++ drivers/mtd/devices/block2mtd.c | 532 ++++++++ drivers/mtd/devices/docg3.c | 2084 ++++++++++++++++++++++++++++++ drivers/mtd/devices/docg3.h | 343 +++++ drivers/mtd/devices/mchp23k256.c | 259 ++++ drivers/mtd/devices/mchp48l640.c | 407 ++++++ drivers/mtd/devices/ms02-nv.c | 306 +++++ drivers/mtd/devices/ms02-nv.h | 101 ++ drivers/mtd/devices/mtd_dataflash.c | 946 ++++++++++++++ drivers/mtd/devices/mtd_intel_dg.c | 883 +++++++++++++ drivers/mtd/devices/mtdram.c | 187 +++ drivers/mtd/devices/phram.c | 445 +++++++ drivers/mtd/devices/pmc551.c | 847 ++++++++++++ drivers/mtd/devices/powernv_flash.c | 298 +++++ drivers/mtd/devices/serial_flash_cmds.h | 49 + drivers/mtd/devices/slram.c | 354 +++++ drivers/mtd/devices/spear_smi.c | 1102 ++++++++++++++++ drivers/mtd/devices/sst25l.c | 421 ++++++ drivers/mtd/devices/st_spi_fsm.c | 2144 +++++++++++++++++++++++++++++++ 22 files changed, 12420 insertions(+) create mode 100644 drivers/mtd/devices/Kconfig create mode 100644 drivers/mtd/devices/Makefile create mode 100644 drivers/mtd/devices/bcm47xxsflash.c create mode 100644 drivers/mtd/devices/bcm47xxsflash.h create mode 100644 drivers/mtd/devices/block2mtd.c create mode 100644 drivers/mtd/devices/docg3.c create mode 100644 drivers/mtd/devices/docg3.h create mode 100644 drivers/mtd/devices/mchp23k256.c create mode 100644 drivers/mtd/devices/mchp48l640.c create mode 100644 drivers/mtd/devices/ms02-nv.c create mode 100644 drivers/mtd/devices/ms02-nv.h create mode 100644 drivers/mtd/devices/mtd_dataflash.c create mode 100644 drivers/mtd/devices/mtd_intel_dg.c create mode 100644 drivers/mtd/devices/mtdram.c create mode 100644 drivers/mtd/devices/phram.c create mode 100644 drivers/mtd/devices/pmc551.c create mode 100644 drivers/mtd/devices/powernv_flash.c create mode 100644 drivers/mtd/devices/serial_flash_cmds.h create mode 100644 drivers/mtd/devices/slram.c create mode 100644 drivers/mtd/devices/spear_smi.c create mode 100644 drivers/mtd/devices/sst25l.c create mode 100644 drivers/mtd/devices/st_spi_fsm.c (limited to 'drivers/mtd/devices') diff --git a/drivers/mtd/devices/Kconfig b/drivers/mtd/devices/Kconfig new file mode 100644 index 000000000..e518dfeee --- /dev/null +++ b/drivers/mtd/devices/Kconfig @@ -0,0 +1,227 @@ +# SPDX-License-Identifier: GPL-2.0-only +menu "Self-contained MTD device drivers" + depends on MTD!=n + depends on HAS_IOMEM + +config MTD_PMC551 + tristate "Ramix PMC551 PCI Mezzanine RAM card support" + depends on PCI + help + This provides a MTD device driver for the Ramix PMC551 RAM PCI card + from Ramix Inc. . + These devices come in memory configurations from 32M - 1G. If you + have one, you probably want to enable this. + + If this driver is compiled as a module you get the ability to select + the size of the aperture window pointing into the devices memory. + What this means is that if you have a 1G card, normally the kernel + will use a 1G memory map as its view of the device. As a module, + you can select a 1M window into the memory and the driver will + "slide" the window around the PMC551's memory. This was + particularly useful on the 2.2 kernels on PPC architectures as there + was limited kernel space to deal with. + +config MTD_PMC551_BUGFIX + bool "PMC551 256M DRAM Bugfix" + depends on MTD_PMC551 + help + Some of Ramix's PMC551 boards with 256M configurations have invalid + column and row mux values. This option will fix them, but will + break other memory configurations. If unsure say N. + +config MTD_PMC551_DEBUG + bool "PMC551 Debugging" + depends on MTD_PMC551 + help + This option makes the PMC551 more verbose during its operation and + is only really useful if you are developing on this driver or + suspect a possible hardware or driver bug. If unsure say N. + +config MTD_MS02NV + tristate "DEC MS02-NV NVRAM module support" + depends on MACH_DECSTATION + help + This is an MTD driver for the DEC's MS02-NV (54-20948-01) battery + backed-up NVRAM module. The module was originally meant as an NFS + accelerator. Say Y here if you have a DECstation 5000/2x0 or a + DECsystem 5900 equipped with such a module. + + If you want to compile this driver as a module ( = code which can be + inserted in and removed from the running kernel whenever you want), + say M here and read . + The module will be called ms02-nv. + +config MTD_DATAFLASH + tristate "Support for AT45xxx DataFlash" + depends on SPI_MASTER + help + This enables access to AT45xxx DataFlash chips, using SPI. + Sometimes DataFlash chips are packaged inside MMC-format + cards; at this writing, the MMC stack won't handle those. + +config MTD_DATAFLASH_WRITE_VERIFY + bool "Verify DataFlash page writes" + depends on MTD_DATAFLASH + help + This adds an extra check when data is written to the flash. + It may help if you are verifying chip setup (timings etc) on + your board. There is a rare possibility that even though the + device thinks the write was successful, a bit could have been + flipped accidentally due to device wear or something else. + +config MTD_DATAFLASH_OTP + bool "DataFlash OTP support (Security Register)" + depends on MTD_DATAFLASH + help + Newer DataFlash chips (revisions C and D) support 128 bytes of + one-time-programmable (OTP) data. The first half may be written + (once) with up to 64 bytes of data, such as a serial number or + other key product data. The second half is programmed with a + unique-to-each-chip bit pattern at the factory. + +config MTD_MCHP23K256 + tristate "Microchip 23K256 SRAM" + depends on SPI_MASTER + help + This enables access to Microchip 23K256 SRAM chips, using SPI. + + Set up your spi devices with the right board-specific + platform data, or a device tree description if you want to + specify device partitioning + +config MTD_MCHP48L640 + tristate "Microchip 48L640 EERAM" + depends on SPI_MASTER + help + This enables access to Microchip 48L640 EERAM chips, using SPI. + +config MTD_SPEAR_SMI + tristate "SPEAR MTD NOR Support through SMI controller" + depends on PLAT_SPEAR || COMPILE_TEST + default PLAT_SPEAR + help + This enable SNOR support on SPEAR platforms using SMI controller + +config MTD_SST25L + tristate "Support SST25L (non JEDEC) SPI Flash chips" + depends on SPI_MASTER + help + This enables access to the non JEDEC SST25L SPI flash chips, used + for program and data storage. + + Set up your spi devices with the right board-specific platform data, + if you want to specify device partitioning. + +config MTD_BCM47XXSFLASH + tristate "Support for serial flash on BCMA bus" + depends on BCMA_SFLASH && (MIPS || ARM) + help + BCMA bus can have various flash memories attached, they are + registered by bcma as platform devices. This enables driver for + serial flash memories. + +config MTD_SLRAM + tristate "Uncached system RAM" + help + If your CPU cannot cache all of the physical memory in your machine, + you can still use it for storage or swap by using this driver to + present it to the system as a Memory Technology Device. + +config MTD_PHRAM + tristate "Physical system RAM" + help + This is a re-implementation of the slram driver above. + + Use this driver to access physical memory that the kernel proper + doesn't have access to, memory beyond the mem=xxx limit, nvram, + memory on the video card, etc... + +config MTD_MTDRAM + tristate "Test driver using RAM" + help + This enables a test MTD device driver which uses vmalloc() to + provide storage. You probably want to say 'N' unless you're + testing stuff. + +config MTDRAM_TOTAL_SIZE + int "MTDRAM device size in KiB" + depends on MTD_MTDRAM + default "4096" + help + This allows you to configure the total size of the MTD device + emulated by the MTDRAM driver. If the MTDRAM driver is built + as a module, it is also possible to specify this as a parameter when + loading the module. + +config MTDRAM_ERASE_SIZE + int "MTDRAM erase block size in KiB" + depends on MTD_MTDRAM + default "128" + help + This allows you to configure the size of the erase blocks in the + device emulated by the MTDRAM driver. If the MTDRAM driver is built + as a module, it is also possible to specify this as a parameter when + loading the module. + +config MTD_BLOCK2MTD + tristate "MTD using block device" + depends on BLOCK + help + This driver allows a block device to appear as an MTD. It would + generally be used in the following cases: + + Using Compact Flash as an MTD, these usually present themselves to + the system as an ATA drive. + Testing MTD users (eg JFFS2) on large media and media that might + be removed during a write (using the floppy drive). + +config MTD_POWERNV_FLASH + tristate "powernv flash MTD driver" + depends on PPC_POWERNV + help + This provides an MTD device to access flash on powernv OPAL + platforms from Linux. This device abstracts away the + firmware interface for flash access. + +config MTD_INTEL_DG + tristate "Intel Discrete Graphics non-volatile memory driver" + depends on AUXILIARY_BUS && MTD + depends on DRM_I915!=n || DRM_XE!=n || COMPILE_TEST + help + This provides an MTD device to access Intel Discrete Graphics + non-volatile memory. + + To compile this driver as a module, choose M here: the module + will be called mtd-intel-dg. + +comment "Disk-On-Chip Device Drivers" + +config MTD_DOCG3 + tristate "M-Systems Disk-On-Chip G3" + select BCH + select BCH_CONST_PARAMS if !MTD_NAND_ECC_SW_BCH + select BITREVERSE + help + This provides an MTD device driver for the M-Systems DiskOnChip + G3 devices. + + The driver provides access to G3 DiskOnChip, distributed by + M-Systems and now Sandisk. The support is very experimental, + and doesn't give access to any write operations. + +config MTD_ST_SPI_FSM + tristate "ST Microelectronics SPI FSM Serial Flash Controller" + depends on ARCH_STI + help + This provides an MTD device driver for the ST Microelectronics + SPI Fast Sequence Mode (FSM) Serial Flash Controller and support + for a subset of connected Serial Flash devices. + +if MTD_DOCG3 +config BCH_CONST_M + default 14 +config BCH_CONST_T + default 4 +endif + +endmenu diff --git a/drivers/mtd/devices/Makefile b/drivers/mtd/devices/Makefile new file mode 100644 index 000000000..9fe4ce9cf --- /dev/null +++ b/drivers/mtd/devices/Makefile @@ -0,0 +1,24 @@ +# SPDX-License-Identifier: GPL-2.0 +# +# linux/drivers/mtd/devices/Makefile +# + +obj-$(CONFIG_MTD_DOCG3) += docg3.o +obj-$(CONFIG_MTD_SLRAM) += slram.o +obj-$(CONFIG_MTD_PHRAM) += phram.o +obj-$(CONFIG_MTD_PMC551) += pmc551.o +obj-$(CONFIG_MTD_MS02NV) += ms02-nv.o +obj-$(CONFIG_MTD_MTDRAM) += mtdram.o +obj-$(CONFIG_MTD_BLOCK2MTD) += block2mtd.o +obj-$(CONFIG_MTD_DATAFLASH) += mtd_dataflash.o +obj-$(CONFIG_MTD_MCHP23K256) += mchp23k256.o +obj-$(CONFIG_MTD_MCHP48L640) += mchp48l640.o +obj-$(CONFIG_MTD_SPEAR_SMI) += spear_smi.o +obj-$(CONFIG_MTD_SST25L) += sst25l.o +obj-$(CONFIG_MTD_BCM47XXSFLASH) += bcm47xxsflash.o +obj-$(CONFIG_MTD_ST_SPI_FSM) += st_spi_fsm.o +obj-$(CONFIG_MTD_POWERNV_FLASH) += powernv_flash.o +obj-$(CONFIG_MTD_INTEL_DG) += mtd_intel_dg.o + + +CFLAGS_docg3.o += -I$(src) diff --git a/drivers/mtd/devices/bcm47xxsflash.c b/drivers/mtd/devices/bcm47xxsflash.c new file mode 100644 index 000000000..2edc46741 --- /dev/null +++ b/drivers/mtd/devices/bcm47xxsflash.c @@ -0,0 +1,380 @@ +// SPDX-License-Identifier: GPL-2.0-only +#include +#include +#include +#include +#include +#include +#include +#include + +#include "bcm47xxsflash.h" + +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("Serial flash driver for BCMA bus"); + +static const char * const probes[] = { "bcm47xxpart", NULL }; + +/************************************************** + * Various helpers + **************************************************/ + +static void bcm47xxsflash_cmd(struct bcm47xxsflash *b47s, u32 opcode) +{ + int i; + + b47s->cc_write(b47s, BCMA_CC_FLASHCTL, BCMA_CC_FLASHCTL_START | opcode); + for (i = 0; i < 1000; i++) { + if (!(b47s->cc_read(b47s, BCMA_CC_FLASHCTL) & + BCMA_CC_FLASHCTL_BUSY)) + return; + cpu_relax(); + } + pr_err("Control command failed (timeout)!\n"); +} + +static int bcm47xxsflash_poll(struct bcm47xxsflash *b47s, int timeout) +{ + unsigned long deadline = jiffies + timeout; + + do { + switch (b47s->type) { + case BCM47XXSFLASH_TYPE_ST: + bcm47xxsflash_cmd(b47s, OPCODE_ST_RDSR); + if (!(b47s->cc_read(b47s, BCMA_CC_FLASHDATA) & + SR_ST_WIP)) + return 0; + break; + case BCM47XXSFLASH_TYPE_ATMEL: + bcm47xxsflash_cmd(b47s, OPCODE_AT_STATUS); + if (b47s->cc_read(b47s, BCMA_CC_FLASHDATA) & + SR_AT_READY) + return 0; + break; + } + + cpu_relax(); + udelay(1); + } while (!time_after_eq(jiffies, deadline)); + + pr_err("Timeout waiting for flash to be ready!\n"); + + return -EBUSY; +} + +/************************************************** + * MTD ops + **************************************************/ + +static int bcm47xxsflash_erase(struct mtd_info *mtd, struct erase_info *erase) +{ + struct bcm47xxsflash *b47s = mtd->priv; + + switch (b47s->type) { + case BCM47XXSFLASH_TYPE_ST: + bcm47xxsflash_cmd(b47s, OPCODE_ST_WREN); + b47s->cc_write(b47s, BCMA_CC_FLASHADDR, erase->addr); + /* Newer flashes have "sub-sectors" which can be erased + * independently with a new command: ST_SSE. The ST_SE command + * erases 64KB just as before. + */ + if (b47s->blocksize < (64 * 1024)) + bcm47xxsflash_cmd(b47s, OPCODE_ST_SSE); + else + bcm47xxsflash_cmd(b47s, OPCODE_ST_SE); + break; + case BCM47XXSFLASH_TYPE_ATMEL: + b47s->cc_write(b47s, BCMA_CC_FLASHADDR, erase->addr << 1); + bcm47xxsflash_cmd(b47s, OPCODE_AT_PAGE_ERASE); + break; + } + + return bcm47xxsflash_poll(b47s, HZ); +} + +static int bcm47xxsflash_read(struct mtd_info *mtd, loff_t from, size_t len, + size_t *retlen, u_char *buf) +{ + struct bcm47xxsflash *b47s = mtd->priv; + size_t orig_len = len; + + /* Check address range */ + if ((from + len) > mtd->size) + return -EINVAL; + + /* Read as much as possible using fast MMIO window */ + if (from < BCM47XXSFLASH_WINDOW_SZ) { + size_t memcpy_len; + + memcpy_len = min(len, (size_t)(BCM47XXSFLASH_WINDOW_SZ - from)); + memcpy_fromio(buf, b47s->window + from, memcpy_len); + from += memcpy_len; + len -= memcpy_len; + buf += memcpy_len; + } + + /* Use indirect access for content out of the window */ + for (; len; len--) { + b47s->cc_write(b47s, BCMA_CC_FLASHADDR, from++); + bcm47xxsflash_cmd(b47s, OPCODE_ST_READ4B); + *buf++ = b47s->cc_read(b47s, BCMA_CC_FLASHDATA); + } + + *retlen = orig_len; + + return orig_len; +} + +static int bcm47xxsflash_write_st(struct mtd_info *mtd, u32 offset, size_t len, + const u_char *buf) +{ + struct bcm47xxsflash *b47s = mtd->priv; + int written = 0; + + /* Enable writes */ + bcm47xxsflash_cmd(b47s, OPCODE_ST_WREN); + + /* Write first byte */ + b47s->cc_write(b47s, BCMA_CC_FLASHADDR, offset); + b47s->cc_write(b47s, BCMA_CC_FLASHDATA, *buf++); + + /* Program page */ + if (b47s->bcma_cc->core->id.rev < 20) { + bcm47xxsflash_cmd(b47s, OPCODE_ST_PP); + return 1; /* 1B written */ + } + + /* Program page and set CSA (on newer chips we can continue writing) */ + bcm47xxsflash_cmd(b47s, OPCODE_ST_CSA | OPCODE_ST_PP); + offset++; + len--; + written++; + + while (len > 0) { + /* Page boundary, another function call is needed */ + if ((offset & 0xFF) == 0) + break; + + bcm47xxsflash_cmd(b47s, OPCODE_ST_CSA | *buf++); + offset++; + len--; + written++; + } + + /* All done, drop CSA & poll */ + b47s->cc_write(b47s, BCMA_CC_FLASHCTL, 0); + udelay(1); + if (bcm47xxsflash_poll(b47s, HZ / 10)) + pr_err("Flash rejected dropping CSA\n"); + + return written; +} + +static int bcm47xxsflash_write_at(struct mtd_info *mtd, u32 offset, size_t len, + const u_char *buf) +{ + struct bcm47xxsflash *b47s = mtd->priv; + u32 mask = b47s->blocksize - 1; + u32 page = (offset & ~mask) << 1; + u32 byte = offset & mask; + int written = 0; + + /* If we don't overwrite whole page, read it to the buffer first */ + if (byte || (len < b47s->blocksize)) { + int err; + + b47s->cc_write(b47s, BCMA_CC_FLASHADDR, page); + bcm47xxsflash_cmd(b47s, OPCODE_AT_BUF1_LOAD); + /* 250 us for AT45DB321B */ + err = bcm47xxsflash_poll(b47s, HZ / 1000); + if (err) { + pr_err("Timeout reading page 0x%X info buffer\n", page); + return err; + } + } + + /* Change buffer content with our data */ + while (len > 0) { + /* Page boundary, another function call is needed */ + if (byte == b47s->blocksize) + break; + + b47s->cc_write(b47s, BCMA_CC_FLASHADDR, byte++); + b47s->cc_write(b47s, BCMA_CC_FLASHDATA, *buf++); + bcm47xxsflash_cmd(b47s, OPCODE_AT_BUF1_WRITE); + len--; + written++; + } + + /* Program page with the buffer content */ + b47s->cc_write(b47s, BCMA_CC_FLASHADDR, page); + bcm47xxsflash_cmd(b47s, OPCODE_AT_BUF1_PROGRAM); + + return written; +} + +static int bcm47xxsflash_write(struct mtd_info *mtd, loff_t to, size_t len, + size_t *retlen, const u_char *buf) +{ + struct bcm47xxsflash *b47s = mtd->priv; + int written; + + /* Writing functions can return without writing all passed data, for + * example when the hardware is too old or when we git page boundary. + */ + while (len > 0) { + switch (b47s->type) { + case BCM47XXSFLASH_TYPE_ST: + written = bcm47xxsflash_write_st(mtd, to, len, buf); + break; + case BCM47XXSFLASH_TYPE_ATMEL: + written = bcm47xxsflash_write_at(mtd, to, len, buf); + break; + default: + BUG_ON(1); + } + if (written < 0) { + pr_err("Error writing at offset 0x%llX\n", to); + return written; + } + to += (loff_t)written; + len -= written; + *retlen += written; + buf += written; + } + + return 0; +} + +static void bcm47xxsflash_fill_mtd(struct bcm47xxsflash *b47s, + struct device *dev) +{ + struct mtd_info *mtd = &b47s->mtd; + + mtd->priv = b47s; + mtd->dev.parent = dev; + mtd->name = "bcm47xxsflash"; + + mtd->type = MTD_NORFLASH; + mtd->flags = MTD_CAP_NORFLASH; + mtd->size = b47s->size; + mtd->erasesize = b47s->blocksize; + mtd->writesize = 1; + mtd->writebufsize = 1; + + mtd->_erase = bcm47xxsflash_erase; + mtd->_read = bcm47xxsflash_read; + mtd->_write = bcm47xxsflash_write; +} + +/************************************************** + * BCMA + **************************************************/ + +static int bcm47xxsflash_bcma_cc_read(struct bcm47xxsflash *b47s, u16 offset) +{ + return bcma_cc_read32(b47s->bcma_cc, offset); +} + +static void bcm47xxsflash_bcma_cc_write(struct bcm47xxsflash *b47s, u16 offset, + u32 value) +{ + bcma_cc_write32(b47s->bcma_cc, offset, value); +} + +static int bcm47xxsflash_bcma_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct bcma_sflash *sflash = dev_get_platdata(dev); + struct bcm47xxsflash *b47s; + struct resource *res; + int err; + + b47s = devm_kzalloc(dev, sizeof(*b47s), GFP_KERNEL); + if (!b47s) + return -ENOMEM; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res) { + dev_err(dev, "invalid resource\n"); + return -EINVAL; + } + if (!devm_request_mem_region(dev, res->start, resource_size(res), + res->name)) { + dev_err(dev, "can't request region for resource %pR\n", res); + return -EBUSY; + } + + b47s->bcma_cc = container_of(sflash, struct bcma_drv_cc, sflash); + b47s->cc_read = bcm47xxsflash_bcma_cc_read; + b47s->cc_write = bcm47xxsflash_bcma_cc_write; + + /* + * On old MIPS devices cache was magically invalidated when needed, + * allowing us to use cached access and gain some performance. Trying + * the same on ARM based BCM53573 results in flash corruptions, we need + * to use uncached access for it. + * + * It may be arch specific, but right now there is only 1 ARM SoC using + * this driver, so let's follow Broadcom's reference code and check + * ChipCommon revision. + */ + if (b47s->bcma_cc->core->id.rev == 54) + b47s->window = ioremap(res->start, resource_size(res)); + else + b47s->window = ioremap_cache(res->start, resource_size(res)); + if (!b47s->window) { + dev_err(dev, "ioremap failed for resource %pR\n", res); + return -ENOMEM; + } + + switch (b47s->bcma_cc->capabilities & BCMA_CC_CAP_FLASHT) { + case BCMA_CC_FLASHT_STSER: + b47s->type = BCM47XXSFLASH_TYPE_ST; + break; + case BCMA_CC_FLASHT_ATSER: + b47s->type = BCM47XXSFLASH_TYPE_ATMEL; + break; + } + + b47s->blocksize = sflash->blocksize; + b47s->numblocks = sflash->numblocks; + b47s->size = sflash->size; + bcm47xxsflash_fill_mtd(b47s, &pdev->dev); + + platform_set_drvdata(pdev, b47s); + + err = mtd_device_parse_register(&b47s->mtd, probes, NULL, NULL, 0); + if (err) { + pr_err("Failed to register MTD device: %d\n", err); + iounmap(b47s->window); + return err; + } + + if (bcm47xxsflash_poll(b47s, HZ / 10)) + pr_warn("Serial flash busy\n"); + + return 0; +} + +static void bcm47xxsflash_bcma_remove(struct platform_device *pdev) +{ + struct bcm47xxsflash *b47s = platform_get_drvdata(pdev); + + mtd_device_unregister(&b47s->mtd); + iounmap(b47s->window); +} + +static struct platform_driver bcma_sflash_driver = { + .probe = bcm47xxsflash_bcma_probe, + .remove = bcm47xxsflash_bcma_remove, + .driver = { + .name = "bcma_sflash", + }, +}; + +/************************************************** + * Init + **************************************************/ + +module_platform_driver(bcma_sflash_driver); diff --git a/drivers/mtd/devices/bcm47xxsflash.h b/drivers/mtd/devices/bcm47xxsflash.h new file mode 100644 index 000000000..fef0d5e42 --- /dev/null +++ b/drivers/mtd/devices/bcm47xxsflash.h @@ -0,0 +1,81 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef __BCM47XXSFLASH_H +#define __BCM47XXSFLASH_H + +#include + +#define BCM47XXSFLASH_WINDOW_SZ SZ_16M + +/* Used for ST flashes only. */ +#define OPCODE_ST_WREN 0x0006 /* Write Enable */ +#define OPCODE_ST_WRDIS 0x0004 /* Write Disable */ +#define OPCODE_ST_RDSR 0x0105 /* Read Status Register */ +#define OPCODE_ST_WRSR 0x0101 /* Write Status Register */ +#define OPCODE_ST_READ 0x0303 /* Read Data Bytes */ +#define OPCODE_ST_PP 0x0302 /* Page Program */ +#define OPCODE_ST_SE 0x02d8 /* Sector Erase */ +#define OPCODE_ST_BE 0x00c7 /* Bulk Erase */ +#define OPCODE_ST_DP 0x00b9 /* Deep Power-down */ +#define OPCODE_ST_RES 0x03ab /* Read Electronic Signature */ +#define OPCODE_ST_CSA 0x1000 /* Keep chip select asserted */ +#define OPCODE_ST_SSE 0x0220 /* Sub-sector Erase */ +#define OPCODE_ST_READ4B 0x6313 /* Read Data Bytes in 4Byte addressing mode */ + +/* Used for Atmel flashes only. */ +#define OPCODE_AT_READ 0x07e8 +#define OPCODE_AT_PAGE_READ 0x07d2 +#define OPCODE_AT_STATUS 0x01d7 +#define OPCODE_AT_BUF1_WRITE 0x0384 +#define OPCODE_AT_BUF2_WRITE 0x0387 +#define OPCODE_AT_BUF1_ERASE_PROGRAM 0x0283 +#define OPCODE_AT_BUF2_ERASE_PROGRAM 0x0286 +#define OPCODE_AT_BUF1_PROGRAM 0x0288 +#define OPCODE_AT_BUF2_PROGRAM 0x0289 +#define OPCODE_AT_PAGE_ERASE 0x0281 +#define OPCODE_AT_BLOCK_ERASE 0x0250 +#define OPCODE_AT_BUF1_WRITE_ERASE_PROGRAM 0x0382 +#define OPCODE_AT_BUF2_WRITE_ERASE_PROGRAM 0x0385 +#define OPCODE_AT_BUF1_LOAD 0x0253 +#define OPCODE_AT_BUF2_LOAD 0x0255 +#define OPCODE_AT_BUF1_COMPARE 0x0260 +#define OPCODE_AT_BUF2_COMPARE 0x0261 +#define OPCODE_AT_BUF1_REPROGRAM 0x0258 +#define OPCODE_AT_BUF2_REPROGRAM 0x0259 + +/* Status register bits for ST flashes */ +#define SR_ST_WIP 0x01 /* Write In Progress */ +#define SR_ST_WEL 0x02 /* Write Enable Latch */ +#define SR_ST_BP_MASK 0x1c /* Block Protect */ +#define SR_ST_BP_SHIFT 2 +#define SR_ST_SRWD 0x80 /* Status Register Write Disable */ + +/* Status register bits for Atmel flashes */ +#define SR_AT_READY 0x80 +#define SR_AT_MISMATCH 0x40 +#define SR_AT_ID_MASK 0x38 +#define SR_AT_ID_SHIFT 3 + +struct bcma_drv_cc; + +enum bcm47xxsflash_type { + BCM47XXSFLASH_TYPE_ATMEL, + BCM47XXSFLASH_TYPE_ST, +}; + +struct bcm47xxsflash { + struct bcma_drv_cc *bcma_cc; + int (*cc_read)(struct bcm47xxsflash *b47s, u16 offset); + void (*cc_write)(struct bcm47xxsflash *b47s, u16 offset, u32 value); + + enum bcm47xxsflash_type type; + + void __iomem *window; + + u32 blocksize; + u16 numblocks; + u32 size; + + struct mtd_info mtd; +}; + +#endif /* BCM47XXSFLASH */ diff --git a/drivers/mtd/devices/block2mtd.c b/drivers/mtd/devices/block2mtd.c new file mode 100644 index 000000000..03e80b2c4 --- /dev/null +++ b/drivers/mtd/devices/block2mtd.c @@ -0,0 +1,532 @@ +/* + * block2mtd.c - create an mtd from a block device + * + * Copyright (C) 2001,2002 Simon Evans + * Copyright (C) 2004-2006 Joern Engel + * + * Licence: GPL + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +/* + * When the first attempt at device initialization fails, we may need to + * wait a little bit and retry. This timeout, by default 3 seconds, gives + * device time to start up. Required on BCM2708 and a few other chipsets. + */ +#define MTD_DEFAULT_TIMEOUT 3 + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +/* Maximum number of comma-separated items in the 'block2mtd=' parameter */ +#define BLOCK2MTD_PARAM_MAX_COUNT 3 + +/* Info for the block device */ +struct block2mtd_dev { + struct list_head list; + struct file *bdev_file; + struct mtd_info mtd; + struct mutex write_mutex; +}; + + +/* Static info about the MTD, used in cleanup_module */ +static LIST_HEAD(blkmtd_device_list); + + +static struct page *page_read(struct address_space *mapping, pgoff_t index) +{ + return read_mapping_page(mapping, index, NULL); +} + +/* erase a specified part of the device */ +static int _block2mtd_erase(struct block2mtd_dev *dev, loff_t to, size_t len) +{ + struct address_space *mapping = dev->bdev_file->f_mapping; + struct page *page; + pgoff_t index = to >> PAGE_SHIFT; // page index + int pages = len >> PAGE_SHIFT; + u_long *p; + u_long *max; + + while (pages) { + page = page_read(mapping, index); + if (IS_ERR(page)) + return PTR_ERR(page); + + max = page_address(page) + PAGE_SIZE; + for (p=page_address(page); ppriv; + size_t from = instr->addr; + size_t len = instr->len; + int err; + + mutex_lock(&dev->write_mutex); + err = _block2mtd_erase(dev, from, len); + mutex_unlock(&dev->write_mutex); + if (err) + pr_err("erase failed err = %d\n", err); + + return err; +} + + +static int block2mtd_read(struct mtd_info *mtd, loff_t from, size_t len, + size_t *retlen, u_char *buf) +{ + struct block2mtd_dev *dev = mtd->priv; + struct address_space *mapping = dev->bdev_file->f_mapping; + struct page *page; + pgoff_t index = from >> PAGE_SHIFT; + int offset = from & (PAGE_SIZE-1); + int cpylen; + + while (len) { + if ((offset + len) > PAGE_SIZE) + cpylen = PAGE_SIZE - offset; // multiple pages + else + cpylen = len; // this page + len = len - cpylen; + + page = page_read(mapping, index); + if (IS_ERR(page)) + return PTR_ERR(page); + + memcpy(buf, page_address(page) + offset, cpylen); + put_page(page); + + if (retlen) + *retlen += cpylen; + buf += cpylen; + offset = 0; + index++; + } + return 0; +} + + +/* write data to the underlying device */ +static int _block2mtd_write(struct block2mtd_dev *dev, const u_char *buf, + loff_t to, size_t len, size_t *retlen) +{ + struct page *page; + struct address_space *mapping = dev->bdev_file->f_mapping; + pgoff_t index = to >> PAGE_SHIFT; // page index + int offset = to & ~PAGE_MASK; // page offset + int cpylen; + + while (len) { + if ((offset+len) > PAGE_SIZE) + cpylen = PAGE_SIZE - offset; // multiple pages + else + cpylen = len; // this page + len = len - cpylen; + + page = page_read(mapping, index); + if (IS_ERR(page)) + return PTR_ERR(page); + + if (memcmp(page_address(page)+offset, buf, cpylen)) { + lock_page(page); + memcpy(page_address(page) + offset, buf, cpylen); + set_page_dirty(page); + unlock_page(page); + balance_dirty_pages_ratelimited(mapping); + } + put_page(page); + + if (retlen) + *retlen += cpylen; + + buf += cpylen; + offset = 0; + index++; + } + return 0; +} + + +static int block2mtd_write(struct mtd_info *mtd, loff_t to, size_t len, + size_t *retlen, const u_char *buf) +{ + struct block2mtd_dev *dev = mtd->priv; + int err; + + mutex_lock(&dev->write_mutex); + err = _block2mtd_write(dev, buf, to, len, retlen); + mutex_unlock(&dev->write_mutex); + if (err > 0) + err = 0; + return err; +} + + +/* sync the device - wait until the write queue is empty */ +static void block2mtd_sync(struct mtd_info *mtd) +{ + struct block2mtd_dev *dev = mtd->priv; + sync_blockdev(file_bdev(dev->bdev_file)); + return; +} + + +static void block2mtd_free_device(struct block2mtd_dev *dev) +{ + if (!dev) + return; + + kfree(dev->mtd.name); + + if (dev->bdev_file) { + invalidate_mapping_pages(dev->bdev_file->f_mapping, 0, -1); + bdev_fput(dev->bdev_file); + } + + kfree(dev); +} + +/* + * This function is marked __ref because it calls the __init marked + * early_lookup_bdev when called from the early boot code. + */ +static struct file __ref *mdtblock_early_get_bdev(const char *devname, + blk_mode_t mode, int timeout, struct block2mtd_dev *dev) +{ + struct file *bdev_file = ERR_PTR(-ENODEV); +#ifndef MODULE + int i; + + /* + * We can't use early_lookup_bdev from a running system. + */ + if (system_state >= SYSTEM_RUNNING) + return bdev_file; + + /* + * We might not have the root device mounted at this point. + * Try to resolve the device name by other means. + */ + for (i = 0; i <= timeout; i++) { + dev_t devt; + + if (i) + /* + * Calling wait_for_device_probe in the first loop + * was not enough, sleep for a bit in subsequent + * go-arounds. + */ + msleep(1000); + wait_for_device_probe(); + + if (!early_lookup_bdev(devname, &devt)) { + bdev_file = bdev_file_open_by_dev(devt, mode, dev, NULL); + if (!IS_ERR(bdev_file)) + break; + } + } +#endif + return bdev_file; +} + +static struct block2mtd_dev *add_device(char *devname, int erase_size, + char *label, int timeout) +{ + const blk_mode_t mode = BLK_OPEN_READ | BLK_OPEN_WRITE; + struct file *bdev_file; + struct block_device *bdev; + struct block2mtd_dev *dev; + loff_t size; + char *name; + + if (!devname) + return NULL; + + dev = kzalloc_obj(struct block2mtd_dev); + if (!dev) + return NULL; + + /* Get a handle on the device */ + bdev_file = bdev_file_open_by_path(devname, mode, dev, NULL); + if (IS_ERR(bdev_file)) + bdev_file = mdtblock_early_get_bdev(devname, mode, timeout, + dev); + if (IS_ERR(bdev_file)) { + pr_err("error: cannot open device %s\n", devname); + goto err_free_block2mtd; + } + dev->bdev_file = bdev_file; + bdev = file_bdev(bdev_file); + + if (MAJOR(bdev->bd_dev) == MTD_BLOCK_MAJOR) { + pr_err("attempting to use an MTD device as a block device\n"); + goto err_free_block2mtd; + } + + size = bdev_nr_bytes(bdev); + if ((long)size % erase_size) { + pr_err("erasesize must be a divisor of device size\n"); + goto err_free_block2mtd; + } + + mutex_init(&dev->write_mutex); + + /* Setup the MTD structure */ + /* make the name contain the block device in */ + if (!label) + name = kasprintf(GFP_KERNEL, "block2mtd: %s", devname); + else + name = kstrdup(label, GFP_KERNEL); + if (!name) + goto err_destroy_mutex; + + dev->mtd.name = name; + + dev->mtd.size = size & PAGE_MASK; + dev->mtd.erasesize = erase_size; + dev->mtd.writesize = 1; + dev->mtd.writebufsize = PAGE_SIZE; + dev->mtd.type = MTD_RAM; + dev->mtd.flags = MTD_CAP_RAM; + dev->mtd._erase = block2mtd_erase; + dev->mtd._write = block2mtd_write; + dev->mtd._sync = block2mtd_sync; + dev->mtd._read = block2mtd_read; + dev->mtd.priv = dev; + dev->mtd.owner = THIS_MODULE; + + if (mtd_device_register(&dev->mtd, NULL, 0)) { + /* Device didn't get added, so free the entry */ + goto err_destroy_mutex; + } + + list_add(&dev->list, &blkmtd_device_list); + pr_info("mtd%d: [%s] erase_size = %dKiB [%d]\n", + dev->mtd.index, + label ? label : dev->mtd.name + strlen("block2mtd: "), + dev->mtd.erasesize >> 10, dev->mtd.erasesize); + return dev; + +err_destroy_mutex: + mutex_destroy(&dev->write_mutex); +err_free_block2mtd: + block2mtd_free_device(dev); + return NULL; +} + + +/* This function works similar to reguler strtoul. In addition, it + * allows some suffixes for a more human-readable number format: + * ki, Ki, kiB, KiB - multiply result with 1024 + * Mi, MiB - multiply result with 1024^2 + * Gi, GiB - multiply result with 1024^3 + */ +static int ustrtoul(const char *cp, char **endp, unsigned int base) +{ + unsigned long result = simple_strtoul(cp, endp, base); + switch (**endp) { + case 'G' : + result *= 1024; + fallthrough; + case 'M': + result *= 1024; + fallthrough; + case 'K': + case 'k': + result *= 1024; + /* By dwmw2 editorial decree, "ki", "Mi" or "Gi" are to be used. */ + if ((*endp)[1] == 'i') { + if ((*endp)[2] == 'B') + (*endp) += 3; + else + (*endp) += 2; + } + } + return result; +} + + +static int parse_num(size_t *num, const char *token) +{ + char *endp; + size_t n; + + n = (size_t) ustrtoul(token, &endp, 0); + if (*endp) + return -EINVAL; + + *num = n; + return 0; +} + + +static inline void kill_final_newline(char *str) +{ + char *newline = strrchr(str, '\n'); + if (newline && !newline[1]) + *newline = 0; +} + + +#ifndef MODULE +static int block2mtd_init_called = 0; +/* 80 for device, 12 for erase size */ +static char block2mtd_paramline[80 + 12]; +#endif + +static int block2mtd_setup2(const char *val) +{ + /* 80 for device, 12 for erase size, 80 for name, 8 for timeout */ + char buf[80 + 12 + 80 + 8]; + char *str = buf; + char *token[BLOCK2MTD_PARAM_MAX_COUNT]; + char *name; + char *label = NULL; + size_t erase_size = PAGE_SIZE; + unsigned long timeout = MTD_DEFAULT_TIMEOUT; + int i, ret; + + if (strnlen(val, sizeof(buf)) >= sizeof(buf)) { + pr_err("parameter too long\n"); + return 0; + } + + strcpy(str, val); + kill_final_newline(str); + + for (i = 0; i < BLOCK2MTD_PARAM_MAX_COUNT; i++) + token[i] = strsep(&str, ","); + + if (str) { + pr_err("too many arguments\n"); + return 0; + } + + if (!token[0]) { + pr_err("no argument\n"); + return 0; + } + + name = token[0]; + if (strlen(name) + 1 > 80) { + pr_err("device name too long\n"); + return 0; + } + + /* Optional argument when custom label is used */ + if (token[1] && strlen(token[1])) { + ret = parse_num(&erase_size, token[1]); + if (ret) { + pr_err("illegal erase size\n"); + return 0; + } + } + + if (token[2]) { + label = token[2]; + pr_info("Using custom MTD label '%s' for dev %s\n", label, name); + } + + add_device(name, erase_size, label, timeout); + + return 0; +} + + +static int block2mtd_setup(const char *val, const struct kernel_param *kp) +{ +#ifdef MODULE + return block2mtd_setup2(val); +#else + /* If more parameters are later passed in via + /sys/module/block2mtd/parameters/block2mtd + and block2mtd_init() has already been called, + we can parse the argument now. */ + + if (block2mtd_init_called) + return block2mtd_setup2(val); + + /* During early boot stage, we only save the parameters + here. We must parse them later: if the param passed + from kernel boot command line, block2mtd_setup() is + called so early that it is not possible to resolve + the device (even kmalloc() fails). Deter that work to + block2mtd_setup2(). */ + + strscpy(block2mtd_paramline, val, sizeof(block2mtd_paramline)); + + return 0; +#endif +} + + +module_param_call(block2mtd, block2mtd_setup, NULL, NULL, 0200); +MODULE_PARM_DESC(block2mtd, "Device to use. \"block2mtd=[,[][,