summaryrefslogtreecommitdiff
path: root/drivers/mtd/devices
diff options
context:
space:
mode:
authorCyrille Pitchen <cyrille.pitchen@atmel.com>2017-04-25 22:08:46 +0200
committerCyrille Pitchen <cyrille.pitchen@wedev4u.fr>2017-05-15 21:56:17 +0200
commitcfc5604c488ccd17936b69008af0c9ae050f4a08 (patch)
treeefcbac6f18eccbb4ac4e9f98a959ee8d16f497b2 /drivers/mtd/devices
parent2ea659a9ef488125eb46da6eb571de5eae5c43f6 (diff)
mtd: spi-nor: introduce SPI 1-2-2 and SPI 1-4-4 protocols
This patch changes the prototype of spi_nor_scan(): its 3rd parameter is replaced by a 'struct spi_nor_hwcaps' pointer, which tells the spi-nor framework about the actual hardware capabilities supported by the SPI controller and its driver. Besides, this patch also introduces a new 'struct spi_nor_flash_parameter' telling the spi-nor framework about the hardware capabilities supported by the SPI flash memory and the associated settings required to use those hardware caps. Then, to improve the readability of spi_nor_scan(), the discovery of the memory settings and the memory initialization are now split into two dedicated functions. 1 - spi_nor_init_params() The spi_nor_init_params() function is responsible for initializing the 'struct spi_nor_flash_parameter'. Currently this structure is filled with legacy values but further patches will allow to override some parameter values dynamically, for instance by reading the JESD216 Serial Flash Discoverable Parameter (SFDP) tables from the SPI memory. The spi_nor_init_params() function only deals with the hardware capabilities of the SPI flash memory: especially it doesn't care about the hardware capabilities supported by the SPI controller. 2 - spi_nor_setup() The second function is called once the 'struct spi_nor_flash_parameter' has been initialized by spi_nor_init_params(). With both 'struct spi_nor_flash_parameter' and 'struct spi_nor_hwcaps', the new argument of spi_nor_scan(), spi_nor_setup() computes the best match between hardware caps supported by both the (Q)SPI memory and controller hence selecting the relevant settings for (Fast) Read and Page Program operations. Signed-off-by: Cyrille Pitchen <cyrille.pitchen@atmel.com> Reviewed-by: Marek Vasut <marek.vasut@gmail.com>
Diffstat (limited to 'drivers/mtd/devices')
-rw-r--r--drivers/mtd/devices/m25p80.c21
1 files changed, 9 insertions, 12 deletions
diff --git a/drivers/mtd/devices/m25p80.c b/drivers/mtd/devices/m25p80.c
index c4df3b1bded0..07073f4ce0bd 100644
--- a/drivers/mtd/devices/m25p80.c
+++ b/drivers/mtd/devices/m25p80.c
@@ -111,14 +111,7 @@ static ssize_t m25p80_write(struct spi_nor *nor, loff_t to, size_t len,
static inline unsigned int m25p80_rx_nbits(struct spi_nor *nor)
{
- switch (nor->flash_read) {
- case SPI_NOR_DUAL:
- return 2;
- case SPI_NOR_QUAD:
- return 4;
- default:
- return 0;
- }
+ return spi_nor_get_protocol_data_nbits(nor->read_proto);
}
/*
@@ -196,7 +189,11 @@ static int m25p_probe(struct spi_device *spi)
struct flash_platform_data *data;
struct m25p *flash;
struct spi_nor *nor;
- enum read_mode mode = SPI_NOR_NORMAL;
+ struct spi_nor_hwcaps hwcaps = {
+ .mask = SNOR_HWCAPS_READ |
+ SNOR_HWCAPS_READ_FAST |
+ SNOR_HWCAPS_PP,
+ };
char *flash_name;
int ret;
@@ -222,9 +219,9 @@ static int m25p_probe(struct spi_device *spi)
flash->spi = spi;
if (spi->mode & SPI_RX_QUAD)
- mode = SPI_NOR_QUAD;
+ hwcaps.mask |= SNOR_HWCAPS_READ_1_1_4;
else if (spi->mode & SPI_RX_DUAL)
- mode = SPI_NOR_DUAL;
+ hwcaps.mask |= SNOR_HWCAPS_READ_1_1_2;
if (data && data->name)
nor->mtd.name = data->name;
@@ -241,7 +238,7 @@ static int m25p_probe(struct spi_device *spi)
else
flash_name = spi->modalias;
- ret = spi_nor_scan(nor, flash_name, mode);
+ ret = spi_nor_scan(nor, flash_name, &hwcaps);
if (ret)
return ret;