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authorMiquel Raynal <miquel.raynal@bootlin.com>2022-02-02 15:45:36 +0100
committerMiquel Raynal <miquel.raynal@bootlin.com>2022-02-10 09:32:30 +0100
commit00360ebae483e603d55ec9a7231b787cb80ffe13 (patch)
tree896d1b7f2add039af3365230230c64cf0e18aae1 /drivers
parent33fce1d8bfa8220eb3edf5b3691a411a9191d0b1 (diff)
spi: mxic: Add support for pipelined ECC operations
Some SPI-NAND chips do not have a proper on-die ECC engine providing error correction/detection. This is particularly an issue on embedded devices with limited resources because all the computations must happen in software, unless an external hardware engine is provided. These external engines are new and can be of two categories: external or pipelined. Macronix is providing both, the former being already supported. The second, however, is very SoC implementation dependent and must be instantiated by the SPI host controller directly. An entire subsystem has been contributed to support these engines which makes the insertion into another subsystem such as SPI quite straightforward without the need for a lot of specific functions. Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com> Reviewed-by: Mark Brown <broonie@kernel.org> Link: https://lore.kernel.org/linux-mtd/20220202144536.393792-1-miquel.raynal@bootlin.com
Diffstat (limited to 'drivers')
-rw-r--r--drivers/spi/Kconfig1
-rw-r--r--drivers/spi/spi-mxic.c113
2 files changed, 112 insertions, 2 deletions
diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig
index b2a8821971e1..269613b03e40 100644
--- a/drivers/spi/Kconfig
+++ b/drivers/spi/Kconfig
@@ -879,6 +879,7 @@ config SPI_SYNQUACER
config SPI_MXIC
tristate "Macronix MX25F0A SPI controller"
depends on SPI_MASTER
+ imply MTD_NAND_ECC_MXIC
help
This selects the Macronix MX25F0A SPI controller driver.
diff --git a/drivers/spi/spi-mxic.c b/drivers/spi/spi-mxic.c
index 0d3390964c6f..55c092069301 100644
--- a/drivers/spi/spi-mxic.c
+++ b/drivers/spi/spi-mxic.c
@@ -12,6 +12,8 @@
#include <linux/io.h>
#include <linux/iopoll.h>
#include <linux/module.h>
+#include <linux/mtd/nand.h>
+#include <linux/mtd/nand-ecc-mxic.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/spi/spi.h>
@@ -167,6 +169,7 @@
#define HW_TEST(x) (0xe0 + ((x) * 4))
struct mxic_spi {
+ struct device *dev;
struct clk *ps_clk;
struct clk *send_clk;
struct clk *send_dly_clk;
@@ -177,6 +180,12 @@ struct mxic_spi {
dma_addr_t dma;
size_t size;
} linear;
+
+ struct {
+ bool use_pipelined_conf;
+ struct nand_ecc_engine *pipelined_engine;
+ void *ctx;
+ } ecc;
};
static int mxic_spi_clk_enable(struct mxic_spi *mxic)
@@ -400,7 +409,15 @@ static ssize_t mxic_spi_mem_dirmap_read(struct spi_mem_dirmap_desc *desc,
LMODE_EN,
mxic->regs + LRD_CTRL);
- memcpy_fromio(buf, mxic->linear.map, len);
+ if (mxic->ecc.use_pipelined_conf && desc->info.op_tmpl.data.ecc) {
+ ret = mxic_ecc_process_data_pipelined(mxic->ecc.pipelined_engine,
+ NAND_PAGE_READ,
+ mxic->linear.dma + offs);
+ if (ret)
+ return ret;
+ } else {
+ memcpy_fromio(buf, mxic->linear.map, len);
+ }
writel(INT_LRD_DIS, mxic->regs + INT_STS);
writel(0, mxic->regs + LRD_CTRL);
@@ -436,7 +453,15 @@ static ssize_t mxic_spi_mem_dirmap_write(struct spi_mem_dirmap_desc *desc,
LMODE_EN,
mxic->regs + LWR_CTRL);
- memcpy_toio(mxic->linear.map, buf, len);
+ if (mxic->ecc.use_pipelined_conf && desc->info.op_tmpl.data.ecc) {
+ ret = mxic_ecc_process_data_pipelined(mxic->ecc.pipelined_engine,
+ NAND_PAGE_WRITE,
+ mxic->linear.dma + offs);
+ if (ret)
+ return ret;
+ } else {
+ memcpy_toio(mxic->linear.map, buf, len);
+ }
writel(INT_LWR_DIS, mxic->regs + INT_STS);
writel(0, mxic->regs + LWR_CTRL);
@@ -547,6 +572,7 @@ static const struct spi_controller_mem_ops mxic_spi_mem_ops = {
static const struct spi_controller_mem_caps mxic_spi_mem_caps = {
.dtr = true,
+ .ecc = true,
};
static void mxic_spi_set_cs(struct spi_device *spi, bool lvl)
@@ -611,6 +637,80 @@ static int mxic_spi_transfer_one(struct spi_master *master,
return 0;
}
+/* ECC wrapper */
+static int mxic_spi_mem_ecc_init_ctx(struct nand_device *nand)
+{
+ struct nand_ecc_engine_ops *ops = mxic_ecc_get_pipelined_ops();
+ struct mxic_spi *mxic = nand->ecc.engine->priv;
+
+ mxic->ecc.use_pipelined_conf = true;
+
+ return ops->init_ctx(nand);
+}
+
+static void mxic_spi_mem_ecc_cleanup_ctx(struct nand_device *nand)
+{
+ struct nand_ecc_engine_ops *ops = mxic_ecc_get_pipelined_ops();
+ struct mxic_spi *mxic = nand->ecc.engine->priv;
+
+ mxic->ecc.use_pipelined_conf = false;
+
+ ops->cleanup_ctx(nand);
+}
+
+static int mxic_spi_mem_ecc_prepare_io_req(struct nand_device *nand,
+ struct nand_page_io_req *req)
+{
+ struct nand_ecc_engine_ops *ops = mxic_ecc_get_pipelined_ops();
+
+ return ops->prepare_io_req(nand, req);
+}
+
+static int mxic_spi_mem_ecc_finish_io_req(struct nand_device *nand,
+ struct nand_page_io_req *req)
+{
+ struct nand_ecc_engine_ops *ops = mxic_ecc_get_pipelined_ops();
+
+ return ops->finish_io_req(nand, req);
+}
+
+static struct nand_ecc_engine_ops mxic_spi_mem_ecc_engine_pipelined_ops = {
+ .init_ctx = mxic_spi_mem_ecc_init_ctx,
+ .cleanup_ctx = mxic_spi_mem_ecc_cleanup_ctx,
+ .prepare_io_req = mxic_spi_mem_ecc_prepare_io_req,
+ .finish_io_req = mxic_spi_mem_ecc_finish_io_req,
+};
+
+static void mxic_spi_mem_ecc_remove(struct mxic_spi *mxic)
+{
+ if (mxic->ecc.pipelined_engine) {
+ mxic_ecc_put_pipelined_engine(mxic->ecc.pipelined_engine);
+ nand_ecc_unregister_on_host_hw_engine(mxic->ecc.pipelined_engine);
+ }
+}
+
+static int mxic_spi_mem_ecc_probe(struct platform_device *pdev,
+ struct mxic_spi *mxic)
+{
+ struct nand_ecc_engine *eng;
+
+ if (!mxic_ecc_get_pipelined_ops())
+ return -EOPNOTSUPP;
+
+ eng = mxic_ecc_get_pipelined_engine(pdev);
+ if (IS_ERR(eng))
+ return PTR_ERR(eng);
+
+ eng->dev = &pdev->dev;
+ eng->integration = NAND_ECC_ENGINE_INTEGRATION_PIPELINED;
+ eng->ops = &mxic_spi_mem_ecc_engine_pipelined_ops;
+ eng->priv = mxic;
+ mxic->ecc.pipelined_engine = eng;
+ nand_ecc_register_on_host_hw_engine(eng);
+
+ return 0;
+}
+
static int __maybe_unused mxic_spi_runtime_suspend(struct device *dev)
{
struct spi_master *master = dev_get_drvdata(dev);
@@ -656,6 +756,7 @@ static int mxic_spi_probe(struct platform_device *pdev)
platform_set_drvdata(pdev, master);
mxic = spi_master_get_devdata(master);
+ mxic->dev = &pdev->dev;
master->dev.of_node = pdev->dev.of_node;
@@ -702,6 +803,12 @@ static int mxic_spi_probe(struct platform_device *pdev)
mxic_spi_hw_init(mxic);
+ ret = mxic_spi_mem_ecc_probe(pdev, mxic);
+ if (ret == -EPROBE_DEFER) {
+ pm_runtime_disable(&pdev->dev);
+ return ret;
+ }
+
ret = spi_register_master(master);
if (ret) {
dev_err(&pdev->dev, "spi_register_master failed\n");
@@ -714,8 +821,10 @@ static int mxic_spi_probe(struct platform_device *pdev)
static int mxic_spi_remove(struct platform_device *pdev)
{
struct spi_master *master = platform_get_drvdata(pdev);
+ struct mxic_spi *mxic = spi_master_get_devdata(master);
pm_runtime_disable(&pdev->dev);
+ mxic_spi_mem_ecc_remove(mxic);
spi_unregister_master(master);
return 0;