106 lines
3.2 KiB
Diff
106 lines
3.2 KiB
Diff
From 56bd0e13d8bc3b4486251b10ac9d2ba7434c21ee Mon Sep 17 00:00:00 2001
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From: Brian Norris <computersforpeace@gmail.com>
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Date: Tue, 10 Nov 2015 12:15:27 -0800
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Subject: [PATCH 081/113] mtd: spi-nor: provide default erase_sector
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implementation
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Some spi-nor drivers perform sector erase by duplicating their
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write_reg() command. Let's not require that the driver fill this out,
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and provide a default instead.
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Tested on m25p80.c and Medatek's MT8173 SPI NOR flash driver.
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Signed-off-by: Brian Norris <computersforpeace@gmail.com>
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---
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drivers/mtd/spi-nor/spi-nor.c | 37 +++++++++++++++++++++++++++++++++----
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include/linux/mtd/spi-nor.h | 3 ++-
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2 files changed, 35 insertions(+), 5 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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@@ -38,6 +38,7 @@
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#define CHIP_ERASE_2MB_READY_WAIT_JIFFIES (40UL * HZ)
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#define SPI_NOR_MAX_ID_LEN 6
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+#define SPI_NOR_MAX_ADDR_WIDTH 4
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struct flash_info {
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char *name;
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@@ -314,6 +315,29 @@ static void spi_nor_unlock_and_unprep(st
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}
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/*
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+ * Initiate the erasure of a single sector
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+ */
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+static int spi_nor_erase_sector(struct spi_nor *nor, u32 addr)
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+{
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+ u8 buf[SPI_NOR_MAX_ADDR_WIDTH];
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+ int i;
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+
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+ if (nor->erase)
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+ return nor->erase(nor, addr);
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+
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+ /*
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+ * Default implementation, if driver doesn't have a specialized HW
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+ * control
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+ */
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+ for (i = nor->addr_width - 1; i >= 0; i--) {
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+ buf[i] = addr & 0xff;
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+ addr >>= 8;
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+ }
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+
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+ return nor->write_reg(nor, nor->erase_opcode, buf, nor->addr_width);
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+}
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+
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+/*
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* Erase an address range on the nor chip. The address range may extend
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* one or more erase sectors. Return an error is there is a problem erasing.
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*/
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@@ -372,10 +396,9 @@ static int spi_nor_erase(struct mtd_info
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while (len) {
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write_enable(nor);
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- if (nor->erase(nor, addr)) {
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- ret = -EIO;
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+ ret = spi_nor_erase_sector(nor, addr);
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+ if (ret)
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goto erase_err;
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- }
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addr += mtd->erasesize;
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len -= mtd->erasesize;
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@@ -1113,7 +1136,7 @@ static int set_quad_mode(struct spi_nor
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static int spi_nor_check(struct spi_nor *nor)
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{
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if (!nor->dev || !nor->read || !nor->write ||
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- !nor->read_reg || !nor->write_reg || !nor->erase) {
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+ !nor->read_reg || !nor->write_reg) {
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pr_err("spi-nor: please fill all the necessary fields!\n");
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return -EINVAL;
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}
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@@ -1316,6 +1339,12 @@ int spi_nor_scan(struct spi_nor *nor, co
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nor->addr_width = 3;
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}
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+ if (nor->addr_width > SPI_NOR_MAX_ADDR_WIDTH) {
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+ dev_err(dev, "address width is too large: %u\n",
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+ nor->addr_width);
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+ return -EINVAL;
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+ }
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+
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nor->read_dummy = spi_nor_read_dummy_cycles(nor);
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dev_info(dev, "%s (%lld Kbytes)\n", info->name,
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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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@@ -142,7 +142,8 @@ enum spi_nor_option_flags {
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* @read: [DRIVER-SPECIFIC] read data from the SPI NOR
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* @write: [DRIVER-SPECIFIC] write data to the SPI NOR
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* @erase: [DRIVER-SPECIFIC] erase a sector of the SPI NOR
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- * at the offset @offs
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+ * at the offset @offs; if not provided by the driver,
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+ * spi-nor will send the erase opcode via write_reg()
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* @flash_lock: [FLASH-SPECIFIC] lock a region of the SPI NOR
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* @flash_unlock: [FLASH-SPECIFIC] unlock a region of the SPI NOR
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* @flash_is_locked: [FLASH-SPECIFIC] check if a region of the SPI NOR is
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