116 lines
3.8 KiB
Diff
116 lines
3.8 KiB
Diff
From: Florian Fainelli <f.fainelli@gmail.com>
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Subject: [PATCH v3 6/9] mtd: rawnand: brcmnand: Add platform data structure for BCMA
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Date: Fri, 07 Jan 2022 10:46:11 -0800
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Content-Type: text/plain; charset="utf-8"
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Update the BCMA's chipcommon nand flash driver to detect which
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chip-select is used and pass that information via platform data to the
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brcmnand driver. Make sure that the brcmnand platform data structure is
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always at the beginning of the platform data of the "nflash" device
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created by BCMA to allow brcmnand to safely de-reference it.
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Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
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---
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MAINTAINERS | 1 +
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drivers/bcma/driver_chipcommon_nflash.c | 20 +++++++++++++++++++-
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include/linux/bcma/bcma_driver_chipcommon.h | 5 +++++
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include/linux/platform_data/brcmnand.h | 12 ++++++++++++
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4 files changed, 37 insertions(+), 1 deletion(-)
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create mode 100644 include/linux/platform_data/brcmnand.h
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--- a/MAINTAINERS
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+++ b/MAINTAINERS
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@@ -3901,6 +3901,7 @@ L: linux-mtd@lists.infradead.org
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L: bcm-kernel-feedback-list@broadcom.com
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S: Maintained
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F: drivers/mtd/nand/raw/brcmnand/
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+F: include/linux/platform_data/brcmnand.h
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BROADCOM STB PCIE DRIVER
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M: Jim Quinlan <jim2101024@gmail.com>
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--- a/drivers/bcma/driver_chipcommon_nflash.c
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+++ b/drivers/bcma/driver_chipcommon_nflash.c
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@@ -7,18 +7,28 @@
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#include "bcma_private.h"
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+#include <linux/bitops.h>
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#include <linux/platform_device.h>
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+#include <linux/platform_data/brcmnand.h>
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#include <linux/bcma/bcma.h>
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+/* Alternate NAND controller driver name in order to allow both bcm47xxnflash
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+ * and bcma_brcmnand to be built into the same kernel image.
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+ */
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+static const char *bcma_nflash_alt_name = "bcma_brcmnand";
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+
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struct platform_device bcma_nflash_dev = {
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.name = "bcma_nflash",
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.num_resources = 0,
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};
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+static const char *probes[] = { "bcm47xxpart", NULL };
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+
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/* Initialize NAND flash access */
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int bcma_nflash_init(struct bcma_drv_cc *cc)
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{
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struct bcma_bus *bus = cc->core->bus;
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+ u32 reg;
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if (bus->chipinfo.id != BCMA_CHIP_ID_BCM4706 &&
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cc->core->id.rev != 38) {
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@@ -33,8 +43,16 @@ int bcma_nflash_init(struct bcma_drv_cc
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cc->nflash.present = true;
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if (cc->core->id.rev == 38 &&
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- (cc->status & BCMA_CC_CHIPST_5357_NAND_BOOT))
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+ (cc->status & BCMA_CC_CHIPST_5357_NAND_BOOT)) {
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cc->nflash.boot = true;
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+ /* Determine the chip select that is being used */
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+ reg = bcma_cc_read32(cc, BCMA_CC_NAND_CS_NAND_SELECT) & 0xff;
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+ cc->nflash.brcmnand_info.chip_select = ffs(reg) - 1;
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+ cc->nflash.brcmnand_info.part_probe_types = probes;
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+ cc->nflash.brcmnand_info.ecc_stepsize = 512;
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+ cc->nflash.brcmnand_info.ecc_strength = 1;
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+ bcma_nflash_dev.name = bcma_nflash_alt_name;
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+ }
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/* Prepare platform device, but don't register it yet. It's too early,
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* malloc (required by device_private_init) is not available yet. */
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--- a/include/linux/bcma/bcma_driver_chipcommon.h
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+++ b/include/linux/bcma/bcma_driver_chipcommon.h
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@@ -3,6 +3,7 @@
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#define LINUX_BCMA_DRIVER_CC_H_
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#include <linux/platform_device.h>
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+#include <linux/platform_data/brcmnand.h>
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#include <linux/gpio.h>
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/** ChipCommon core registers. **/
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@@ -599,6 +600,10 @@ struct bcma_sflash {
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#ifdef CONFIG_BCMA_NFLASH
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struct bcma_nflash {
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+ /* Must be the fist member for the brcmnand driver to
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+ * de-reference that structure.
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+ */
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+ struct brcmnand_platform_data brcmnand_info;
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bool present;
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bool boot; /* This is the flash the SoC boots from */
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};
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--- /dev/null
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+++ b/include/linux/platform_data/brcmnand.h
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@@ -0,0 +1,12 @@
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+/* SPDX-License-Identifier: GPL-2.0-only */
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+#ifndef BRCMNAND_PLAT_DATA_H
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+#define BRCMNAND_PLAT_DATA_H
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+
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+struct brcmnand_platform_data {
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+ int chip_select;
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+ const char * const *part_probe_types;
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+ unsigned int ecc_stepsize;
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+ unsigned int ecc_strength;
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+};
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+
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+#endif /* BRCMNAND_PLAT_DATA_H */
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