+++ /dev/null
-From: Florian Fainelli <f.fainelli@gmail.com>
-Subject: [PATCH v3 9/9] mtd: rawnand: brcmnand: Add BCMA shim
-Date: Fri, 07 Jan 2022 10:46:14 -0800
-Content-Type: text/plain; charset="utf-8"
-
-Add a BCMA shim to allow us to register the brcmnand driver using the
-BCMA bus which provides indirect memory mapped access to SoC registers.
-
-There are a number of registers that need to be byte swapped because
-they are natively big endian, coming directly from the NAND chip, and
-there is no bus interface unlike the iProc or STB platforms that
-performs the byte swapping for us.
-
-Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
----
- drivers/mtd/nand/raw/Kconfig | 13 +++
- drivers/mtd/nand/raw/brcmnand/Makefile | 2 +
- drivers/mtd/nand/raw/brcmnand/bcma_nand.c | 132 ++++++++++++++++++++++
- drivers/mtd/nand/raw/brcmnand/brcmnand.c | 4 +
- 4 files changed, 151 insertions(+)
- create mode 100644 drivers/mtd/nand/raw/brcmnand/bcma_nand.c
-
---- a/drivers/mtd/nand/raw/Kconfig
-+++ b/drivers/mtd/nand/raw/Kconfig
-@@ -236,6 +236,19 @@ config MTD_NAND_BRCMNAND
- originally designed for Set-Top Box but is used on various BCM7xxx,
- BCM3xxx, BCM63xxx, iProc/Cygnus and more.
-
-+if MTD_NAND_BRCMNAND
-+
-+config MTD_NAND_BRCMNAND_BCMA
-+ tristate "Broadcom BCMA NAND controller"
-+ depends on BCMA_NFLASH
-+ depends on BCMA
-+ help
-+ Enables the BRCMNAND controller over BCMA on BCM47186/BCM5358 SoCs.
-+ The glue driver will take care of performing the low-level I/O
-+ operations to interface the BRCMNAND controller over the BCMA bus.
-+
-+endif # MTD_NAND_BRCMNAND
-+
- config MTD_NAND_BCM47XXNFLASH
- tristate "BCM4706 BCMA NAND controller"
- depends on BCMA_NFLASH
---- a/drivers/mtd/nand/raw/brcmnand/Makefile
-+++ b/drivers/mtd/nand/raw/brcmnand/Makefile
-@@ -6,3 +6,5 @@ obj-$(CONFIG_MTD_NAND_BRCMNAND) += bcm6
- obj-$(CONFIG_MTD_NAND_BRCMNAND) += bcm6368_nand.o
- obj-$(CONFIG_MTD_NAND_BRCMNAND) += brcmstb_nand.o
- obj-$(CONFIG_MTD_NAND_BRCMNAND) += brcmnand.o
-+
-+obj-$(CONFIG_MTD_NAND_BRCMNAND_BCMA) += bcma_nand.o
---- /dev/null
-+++ b/drivers/mtd/nand/raw/brcmnand/bcma_nand.c
-@@ -0,0 +1,132 @@
-+// SPDX-License-Identifier: GPL-2.0-only
-+/*
-+ * Copyright © 2021 Broadcom
-+ */
-+#include <linux/bcma/bcma.h>
-+#include <linux/bcma/bcma_driver_chipcommon.h>
-+#include <linux/device.h>
-+#include <linux/module.h>
-+#include <linux/platform_device.h>
-+
-+#include "brcmnand.h"
-+
-+struct brcmnand_bcma_soc {
-+ struct brcmnand_soc soc;
-+ struct bcma_drv_cc *cc;
-+};
-+
-+static inline bool brcmnand_bcma_needs_swapping(u32 offset)
-+{
-+ switch (offset) {
-+ case BCMA_CC_NAND_SPARE_RD0:
-+ case BCMA_CC_NAND_SPARE_RD4:
-+ case BCMA_CC_NAND_SPARE_RD8:
-+ case BCMA_CC_NAND_SPARE_RD12:
-+ case BCMA_CC_NAND_SPARE_WR0:
-+ case BCMA_CC_NAND_SPARE_WR4:
-+ case BCMA_CC_NAND_SPARE_WR8:
-+ case BCMA_CC_NAND_SPARE_WR12:
-+ case BCMA_CC_NAND_DEVID:
-+ case BCMA_CC_NAND_DEVID_X:
-+ case BCMA_CC_NAND_SPARE_RD16:
-+ case BCMA_CC_NAND_SPARE_RD20:
-+ case BCMA_CC_NAND_SPARE_RD24:
-+ case BCMA_CC_NAND_SPARE_RD28:
-+ return true;
-+ }
-+
-+ return false;
-+}
-+
-+static inline struct brcmnand_bcma_soc *to_bcma_soc(struct brcmnand_soc *soc)
-+{
-+ return container_of(soc, struct brcmnand_bcma_soc, soc);
-+}
-+
-+static u32 brcmnand_bcma_read_reg(struct brcmnand_soc *soc, u32 offset)
-+{
-+ struct brcmnand_bcma_soc *sc = to_bcma_soc(soc);
-+ u32 val;
-+
-+ /* Offset into the NAND block and deal with the flash cache separately */
-+ if (offset == BRCMNAND_NON_MMIO_FC_ADDR)
-+ offset = BCMA_CC_NAND_CACHE_DATA;
-+ else
-+ offset += BCMA_CC_NAND_REVISION;
-+
-+ val = bcma_cc_read32(sc->cc, offset);
-+
-+ /* Swap if necessary */
-+ if (brcmnand_bcma_needs_swapping(offset))
-+ val = be32_to_cpu(val);
-+ return val;
-+}
-+
-+static void brcmnand_bcma_write_reg(struct brcmnand_soc *soc, u32 val,
-+ u32 offset)
-+{
-+ struct brcmnand_bcma_soc *sc = to_bcma_soc(soc);
-+
-+ /* Offset into the NAND block */
-+ if (offset == BRCMNAND_NON_MMIO_FC_ADDR)
-+ offset = BCMA_CC_NAND_CACHE_DATA;
-+ else
-+ offset += BCMA_CC_NAND_REVISION;
-+
-+ /* Swap if necessary */
-+ if (brcmnand_bcma_needs_swapping(offset))
-+ val = cpu_to_be32(val);
-+
-+ bcma_cc_write32(sc->cc, offset, val);
-+}
-+
-+static struct brcmnand_io_ops brcmnand_bcma_io_ops = {
-+ .read_reg = brcmnand_bcma_read_reg,
-+ .write_reg = brcmnand_bcma_write_reg,
-+};
-+
-+static void brcmnand_bcma_prepare_data_bus(struct brcmnand_soc *soc, bool prepare,
-+ bool is_param)
-+{
-+ struct brcmnand_bcma_soc *sc = to_bcma_soc(soc);
-+
-+ /* Reset the cache address to ensure we are already accessing the
-+ * beginning of a sub-page.
-+ */
-+ bcma_cc_write32(sc->cc, BCMA_CC_NAND_CACHE_ADDR, 0);
-+}
-+
-+static int brcmnand_bcma_nand_probe(struct platform_device *pdev)
-+{
-+ struct bcma_nflash *nflash = dev_get_platdata(&pdev->dev);
-+ struct brcmnand_bcma_soc *soc;
-+
-+ soc = devm_kzalloc(&pdev->dev, sizeof(*soc), GFP_KERNEL);
-+ if (!soc)
-+ return -ENOMEM;
-+
-+ soc->cc = container_of(nflash, struct bcma_drv_cc, nflash);
-+ soc->soc.prepare_data_bus = brcmnand_bcma_prepare_data_bus;
-+ soc->soc.ops = &brcmnand_bcma_io_ops;
-+
-+ if (soc->cc->core->bus->chipinfo.id == BCMA_CHIP_ID_BCM4706) {
-+ dev_err(&pdev->dev, "Use bcm47xxnflash for 4706!\n");
-+ return -ENODEV;
-+ }
-+
-+ return brcmnand_probe(pdev, &soc->soc);
-+}
-+
-+static struct platform_driver brcmnand_bcma_nand_driver = {
-+ .probe = brcmnand_bcma_nand_probe,
-+ .remove = brcmnand_remove,
-+ .driver = {
-+ .name = "bcma_brcmnand",
-+ .pm = &brcmnand_pm_ops,
-+ }
-+};
-+module_platform_driver(brcmnand_bcma_nand_driver);
-+
-+MODULE_LICENSE("GPL v2");
-+MODULE_AUTHOR("Broadcom");
-+MODULE_DESCRIPTION("NAND controller driver glue for BCMA chips");
---- a/drivers/mtd/nand/raw/brcmnand/brcmnand.c
-+++ b/drivers/mtd/nand/raw/brcmnand/brcmnand.c
-@@ -595,7 +595,11 @@ enum {
-
- static inline bool brcmnand_non_mmio_ops(struct brcmnand_controller *ctrl)
- {
-+#if IS_ENABLED(CONFIG_MTD_NAND_BRCMNAND_BCMA)
- return static_branch_unlikely(&brcmnand_soc_has_ops_key);
-+#else
-+ return false;
-+#endif
- }
-
- static inline u32 nand_readreg(struct brcmnand_controller *ctrl, u32 offs)
projects / openwrt / openwrt.git / blobdiff