138 lines
3.7 KiB
Diff
138 lines
3.7 KiB
Diff
From 2c5a3db21926e9ebfd7a32e3c36a3256ed84903c Mon Sep 17 00:00:00 2001
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From: Hou Zhiqiang <Zhiqiang.Hou@freescale.com>
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Date: Thu, 19 Nov 2015 20:25:24 +0800
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Subject: [PATCH 090/113] mtd: spi-nor: Add SPI NOR layer PM support
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[context adjustment]
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Add the Power Management API in SPI NOR framework.
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The Power Management system will turn off power supply to SPI flash
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when system suspending, and then the SPI flash will be in the reset
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state after system resuming. As a result, the status&configurations
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of SPI flash driver will mismatch with its current hardware state.
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So reinitialize SPI flash to make sure it is resumed to the correct
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state.
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And the SPI NOR layer just do common configuration depending on the
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records in structure spi_nor.
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Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@freescale.com>
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Integrated-by: Jiang Yutang <yutang.jiang@nxp.com>
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---
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drivers/mtd/spi-nor/spi-nor.c | 74 ++++++++++++++++++++++++++++++++++-------
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include/linux/mtd/spi-nor.h | 9 +++++
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2 files changed, 71 insertions(+), 12 deletions(-)
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--- a/drivers/mtd/spi-nor/spi-nor.c
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+++ b/drivers/mtd/spi-nor/spi-nor.c
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@@ -1148,6 +1148,26 @@ static int spi_nor_check(struct spi_nor
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return 0;
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}
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+/*
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+ * Atmel, SST, Intel/Numonyx, and others serial NOR tend to power up
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+ * with the software protection bits set
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+ */
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+static int spi_nor_unprotect_on_powerup(struct spi_nor *nor)
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+{
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+ const struct flash_info *info = NULL;
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+ int ret = 0;
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+
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+ info = spi_nor_read_id(nor);
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+ if (JEDEC_MFR(info) == SNOR_MFR_ATMEL ||
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+ JEDEC_MFR(info) == SNOR_MFR_INTEL ||
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+ JEDEC_MFR(info) == SNOR_MFR_SST) {
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+ write_enable(nor);
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+ ret = write_sr(nor, 0);
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+ }
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+
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+ return ret;
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+}
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+
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int spi_nor_scan(struct spi_nor *nor, const char *name, enum read_mode mode)
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{
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const struct flash_info *info = NULL;
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@@ -1195,19 +1215,9 @@ int spi_nor_scan(struct spi_nor *nor, co
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mutex_init(&nor->lock);
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- /*
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- * Atmel, SST, Intel/Numonyx, and others serial NOR tend to power up
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- * with the software protection bits set
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- */
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-
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- if (JEDEC_MFR(info) == SNOR_MFR_ATMEL ||
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- JEDEC_MFR(info) == SNOR_MFR_INTEL ||
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- JEDEC_MFR(info) == SNOR_MFR_MACRONIX ||
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- JEDEC_MFR(info) == SNOR_MFR_SST ||
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- info->flags & SPI_NOR_HAS_LOCK) {
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- write_enable(nor);
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- write_sr(nor, 0);
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- }
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+ ret = spi_nor_unprotect_on_powerup(nor);
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+ if (ret)
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+ return ret;
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if (!mtd->name)
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mtd->name = dev_name(dev);
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@@ -1374,6 +1384,45 @@ int spi_nor_scan(struct spi_nor *nor, co
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}
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EXPORT_SYMBOL_GPL(spi_nor_scan);
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+static int spi_nor_hw_reinit(struct spi_nor *nor)
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+{
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+ const struct flash_info *info = NULL;
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+ struct device *dev = nor->dev;
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+ int ret;
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+
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+ info = spi_nor_read_id(nor);
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+
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+ ret = spi_nor_unprotect_on_powerup(nor);
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+ if (ret)
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+ return ret;
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+
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+ if (nor->flash_read == SPI_NOR_QUAD) {
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+ ret = set_quad_mode(nor, info);
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+ if (ret) {
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+ dev_err(dev, "quad mode not supported\n");
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+ return ret;
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+ }
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+ }
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+
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+ if (nor->addr_width == 4 &&
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+ JEDEC_MFR(info) != SNOR_MFR_SPANSION)
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+ set_4byte(nor, info, 1);
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+
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+ return 0;
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+}
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+
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+int spi_nor_suspend(struct spi_nor *nor)
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+{
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+ return 0;
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+}
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+EXPORT_SYMBOL_GPL(spi_nor_suspend);
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+
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+int spi_nor_resume(struct spi_nor *nor)
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+{
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+ return spi_nor_hw_reinit(nor);
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+}
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+EXPORT_SYMBOL_GPL(spi_nor_resume);
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+
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static const struct flash_info *spi_nor_match_id(const char *name)
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{
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const struct flash_info *id = spi_nor_ids;
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--- a/include/linux/mtd/spi-nor.h
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+++ b/include/linux/mtd/spi-nor.h
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@@ -210,4 +210,13 @@ static inline struct device_node *spi_no
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*/
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int spi_nor_scan(struct spi_nor *nor, const char *name, enum read_mode mode);
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+/**
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+ * spi_nor_suspend/resume() - the SPI NOR layer PM API
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+ * @nor: the spi_nor structure
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+ *
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+ * Return: 0 for success, others for failure.
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+ */
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+int spi_nor_suspend(struct spi_nor *nor);
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+int spi_nor_resume(struct spi_nor *nor);
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+
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#endif
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