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author | Jonathan Neuschäfer <j.neuschaefer@gmx.net> | 2022-11-24 20:14:00 +0100 |
---|---|---|
committer | Mark Brown <broonie@kernel.org> | 2022-11-25 13:30:16 +0000 |
commit | 9838c182471ee5532824bae7f2669d3539719f78 (patch) | |
tree | 5380e4cfd98e7abd17aa6b5189b38d3df6d5aaec /drivers/spi | |
parent | 1f8811a2613ef9e233d56885a19dd4c6e81a5d94 (diff) | |
download | linux-9838c182471ee5532824bae7f2669d3539719f78.tar.gz linux-9838c182471ee5532824bae7f2669d3539719f78.tar.bz2 linux-9838c182471ee5532824bae7f2669d3539719f78.zip |
spi: wpcm-fiu: Add direct map support
Besides software controlled SPI transfers (UMA, "user mode access"), FIU
also supports a 16 MiB mapping window per attached flash chip.
This patch implements direct mapped read access, to speed up flash reads.
Without direct mapping:
# time dd if=/dev/mtd0ro of=dump bs=1M
16+0 records in
16+0 records out
real 1m 47.74s
user 0m 0.00s
sys 1m 47.75s
With direct mapping:
# time dd if=/dev/mtd0ro of=dump bs=1M
16+0 records in
16+0 records out
real 0m 30.81s
user 0m 0.00s
sys 0m 30.81s
Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>
Link: https://lore.kernel.org/r/20221124191400.287918-4-j.neuschaefer@gmx.net
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/spi')
-rw-r--r-- | drivers/spi/spi-wpcm-fiu.c | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/drivers/spi/spi-wpcm-fiu.c b/drivers/spi/spi-wpcm-fiu.c index e525fe074f88..ab33710d50ac 100644 --- a/drivers/spi/spi-wpcm-fiu.c +++ b/drivers/spi/spi-wpcm-fiu.c @@ -51,10 +51,16 @@ */ #define UMA_WAIT_ITERATIONS 100 +/* The memory-mapped view of flash is 16 MiB long */ +#define MAX_MEMORY_SIZE_PER_CS (16 << 20) +#define MAX_MEMORY_SIZE_TOTAL (4 * MAX_MEMORY_SIZE_PER_CS) + struct wpcm_fiu_spi { struct device *dev; struct clk *clk; void __iomem *regs; + void __iomem *memory; + size_t memory_size; struct regmap *shm_regmap; }; @@ -367,14 +373,64 @@ static int wpcm_fiu_adjust_op_size(struct spi_mem *mem, struct spi_mem_op *op) return 0; } +static int wpcm_fiu_dirmap_create(struct spi_mem_dirmap_desc *desc) +{ + struct wpcm_fiu_spi *fiu = spi_controller_get_devdata(desc->mem->spi->controller); + int cs = desc->mem->spi->chip_select; + + if (desc->info.op_tmpl.data.dir != SPI_MEM_DATA_IN) + return -ENOTSUPP; + + /* + * Unfortunately, FIU only supports a 16 MiB direct mapping window (per + * attached flash chip), but the SPI MEM core doesn't support partial + * direct mappings. This means that we can't support direct mapping on + * flashes that are bigger than 16 MiB. + */ + if (desc->info.offset + desc->info.length > MAX_MEMORY_SIZE_PER_CS) + return -ENOTSUPP; + + /* Don't read past the memory window */ + if (cs * MAX_MEMORY_SIZE_PER_CS + desc->info.offset + desc->info.length > fiu->memory_size) + return -ENOTSUPP; + + return 0; +} + +static ssize_t wpcm_fiu_direct_read(struct spi_mem_dirmap_desc *desc, u64 offs, size_t len, void *buf) +{ + struct wpcm_fiu_spi *fiu = spi_controller_get_devdata(desc->mem->spi->controller); + int cs = desc->mem->spi->chip_select; + + if (offs >= MAX_MEMORY_SIZE_PER_CS) + return -ENOTSUPP; + + offs += cs * MAX_MEMORY_SIZE_PER_CS; + + if (!fiu->memory || offs >= fiu->memory_size) + return -ENOTSUPP; + + len = min_t(size_t, len, fiu->memory_size - offs); + memcpy_fromio(buf, fiu->memory + offs, len); + + return len; +} + static const struct spi_controller_mem_ops wpcm_fiu_mem_ops = { .adjust_op_size = wpcm_fiu_adjust_op_size, .supports_op = wpcm_fiu_supports_op, .exec_op = wpcm_fiu_exec_op, + .dirmap_create = wpcm_fiu_dirmap_create, + .dirmap_read = wpcm_fiu_direct_read, }; static void wpcm_fiu_hw_init(struct wpcm_fiu_spi *fiu) { + /* Configure memory-mapped flash access */ + writeb(FIU_BURST_CFG_R16, fiu->regs + FIU_BURST_BFG); + writeb(MAX_MEMORY_SIZE_TOTAL / (512 << 10), fiu->regs + FIU_CFG); + writeb(MAX_MEMORY_SIZE_PER_CS / (512 << 10) | BIT(6), fiu->regs + FIU_SPI_FL_CFG); + /* Deassert all manually asserted chip selects */ writeb(0x0f, fiu->regs + FIU_UMA_ECTS); } @@ -404,6 +460,14 @@ static int wpcm_fiu_probe(struct platform_device *pdev) if (IS_ERR(fiu->clk)) return PTR_ERR(fiu->clk); + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "memory"); + fiu->memory = devm_ioremap_resource(dev, res); + fiu->memory_size = min_t(size_t, resource_size(res), MAX_MEMORY_SIZE_TOTAL); + if (IS_ERR(fiu->memory)) { + dev_err(dev, "Failed to map flash memory window\n"); + return PTR_ERR(fiu->memory); + } + fiu->shm_regmap = syscon_regmap_lookup_by_phandle_optional(dev->of_node, "nuvoton,shm"); wpcm_fiu_hw_init(fiu); |