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spi: hisi-kunpeng: Add debugfs support

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This patch uses debugfs_regset32 interface to create the registers dump
file. Use it instead of creating a generic debugfs file with manually
written read callback function.

With these entries, users can check all the SPI controller registers
during run time.

Signed-off-by: Jay Fang <f.fangjian@huawei.com>
Link: https://lore.kernel.org/r/1622789718-13977-1-git-send-email-f.fangjian@huawei.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Jay Fang 2021-06-04 14:55:18 +08:00 committed by Mark Brown
parent 6829222b40
commit 2b2142f247
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
1 changed files with 50 additions and 1 deletions
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51
drivers/spi/spi-hisi-kunpeng.c
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@ -9,6 +9,7 @@
#include <linux/acpi.h>
#include <linux/bitfield.h>
#include <linux/debugfs.h>
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/interrupt.h>
@ -126,6 +127,7 @@ struct hisi_spi {
void __iomem *regs;
int irq;
u32 fifo_len; /* depth of the FIFO buffer */
u16 bus_num;
/* Current message transfer state info */
const void *tx;
@ -133,8 +135,49 @@ struct hisi_spi {
void *rx;
unsigned int rx_len;
u8 n_bytes; /* current is a 1/2/4 bytes op */
struct dentry *debugfs;
struct debugfs_regset32 regset;
};
#define HISI_SPI_DBGFS_REG(_name, _off) \
{ \
.name = _name, \
.offset = _off, \
}
static const struct debugfs_reg32 hisi_spi_regs[] = {
HISI_SPI_DBGFS_REG("CSCR", HISI_SPI_CSCR),
HISI_SPI_DBGFS_REG("CR", HISI_SPI_CR),
HISI_SPI_DBGFS_REG("ENR", HISI_SPI_ENR),
HISI_SPI_DBGFS_REG("FIFOC", HISI_SPI_FIFOC),
HISI_SPI_DBGFS_REG("IMR", HISI_SPI_IMR),
HISI_SPI_DBGFS_REG("DIN", HISI_SPI_DIN),
HISI_SPI_DBGFS_REG("DOUT", HISI_SPI_DOUT),
HISI_SPI_DBGFS_REG("SR", HISI_SPI_SR),
HISI_SPI_DBGFS_REG("RISR", HISI_SPI_RISR),
HISI_SPI_DBGFS_REG("ISR", HISI_SPI_ISR),
HISI_SPI_DBGFS_REG("ICR", HISI_SPI_ICR),
HISI_SPI_DBGFS_REG("VERSION", HISI_SPI_VERSION),
};
static int hisi_spi_debugfs_init(struct hisi_spi *hs)
{
char name[32];
snprintf(name, 32, "hisi_spi%d", hs->bus_num);
hs->debugfs = debugfs_create_dir(name, NULL);
if (!hs->debugfs)
return -ENOMEM;
hs->regset.regs = hisi_spi_regs;
hs->regset.nregs = ARRAY_SIZE(hisi_spi_regs);
hs->regset.base = hs->regs;
debugfs_create_regset32("registers", 0400, hs->debugfs, &hs->regset);
return 0;
}
static u32 hisi_spi_busy(struct hisi_spi *hs)
{
return readl(hs->regs + HISI_SPI_SR) & SR_BUSY;
@ -424,6 +467,7 @@ static int hisi_spi_probe(struct platform_device *pdev)
hs = spi_controller_get_devdata(master);
hs->dev = dev;
hs->irq = irq;
hs->bus_num = pdev->id;
hs->regs = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(hs->regs))
@ -446,7 +490,7 @@ static int hisi_spi_probe(struct platform_device *pdev)
master->use_gpio_descriptors = true;
master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH | SPI_LOOP;
master->bits_per_word_mask = SPI_BPW_RANGE_MASK(4, 32);
master->bus_num = pdev->id;
master->bus_num = hs->bus_num;
master->setup = hisi_spi_setup;
master->cleanup = hisi_spi_cleanup;
master->transfer_one = hisi_spi_transfer_one;
@ -462,6 +506,9 @@ static int hisi_spi_probe(struct platform_device *pdev)
return ret;
}
if (hisi_spi_debugfs_init(hs))
dev_info(dev, "failed to create debugfs dir\n");
ret = spi_register_controller(master);
if (ret) {
dev_err(dev, "failed to register spi master, ret=%d\n", ret);
@ -478,7 +525,9 @@ static int hisi_spi_probe(struct platform_device *pdev)
static int hisi_spi_remove(struct platform_device *pdev)
{
struct spi_controller *master = platform_get_drvdata(pdev);
struct hisi_spi *hs = spi_controller_get_devdata(master);
debugfs_remove_recursive(hs->debugfs);
spi_unregister_controller(master);
return 0;