It is useful to obtain the block-protect setting of the SPI flash, so we know whether it is fully open or (perhaps partially) write-protected. Add a method for this. Update the sandbox driver to process this operation and add a test.
Signed-off-by: Simon Glass sjg@chromium.org ---
arch/sandbox/include/asm/test.h | 8 ++++++++ drivers/mtd/spi/sandbox.c | 10 ++++++++++ drivers/mtd/spi/sf-uclass.c | 9 +++++++++ drivers/mtd/spi/sf_internal.h | 3 +++ drivers/mtd/spi/sf_probe.c | 8 ++++++++ drivers/mtd/spi/spi_flash.c | 12 ++++++++++++ include/spi_flash.h | 27 +++++++++++++++++++++++++++ test/dm/sf.c | 9 +++++++++ 8 files changed, 86 insertions(+)
diff --git a/arch/sandbox/include/asm/test.h b/arch/sandbox/include/asm/test.h index 8e60f80ae7f..5e818392959 100644 --- a/arch/sandbox/include/asm/test.h +++ b/arch/sandbox/include/asm/test.h @@ -113,4 +113,12 @@ int sandbox_osd_get_mem(struct udevice *dev, u8 *buf, size_t buflen); int sandbox_pwm_get_config(struct udevice *dev, uint channel, uint *period_nsp, uint *duty_nsp, bool *enablep, bool *polarityp);
+/** + * sandbox_sf_set_block_protect() - Set the BP bits of the status register + * + * @dev: Device to update + * @bp_mask: BP bits to set (bits 2:0, so a value of 0 to 7) + */ +void sandbox_sf_set_block_protect(struct udevice *dev, int bp_mask); + #endif diff --git a/drivers/mtd/spi/sandbox.c b/drivers/mtd/spi/sandbox.c index 7fef754c634..7b9891cb981 100644 --- a/drivers/mtd/spi/sandbox.c +++ b/drivers/mtd/spi/sandbox.c @@ -57,6 +57,8 @@ static const char *sandbox_sf_state_name(enum sandbox_sf_state state) /* Bits for the status register */ #define STAT_WIP (1 << 0) #define STAT_WEL (1 << 1) +#define STAT_BP_SHIFT 2 +#define STAT_BP_MASK (7 << STAT_BP_SHIFT)
/* Assume all SPI flashes have 3 byte addresses since they do atm */ #define SF_ADDR_LEN 3 @@ -102,6 +104,14 @@ struct sandbox_spi_flash_plat_data { int cs; };
+void sandbox_sf_set_block_protect(struct udevice *dev, int bp_mask) +{ + struct sandbox_spi_flash *sbsf = dev_get_priv(dev); + + sbsf->status &= ~STAT_BP_MASK; + sbsf->status |= bp_mask << STAT_BP_SHIFT; +} + /** * This is a very strange probe function. If it has platform data (which may * have come from the device tree) then this function gets the filename and diff --git a/drivers/mtd/spi/sf-uclass.c b/drivers/mtd/spi/sf-uclass.c index 662525f016f..719a2fd23ae 100644 --- a/drivers/mtd/spi/sf-uclass.c +++ b/drivers/mtd/spi/sf-uclass.c @@ -28,6 +28,15 @@ int spi_flash_erase_dm(struct udevice *dev, u32 offset, size_t len) return log_ret(sf_get_ops(dev)->erase(dev, offset, len)); }
+int spl_flash_get_sw_write_prot(struct udevice *dev) +{ + struct dm_spi_flash_ops *ops = sf_get_ops(dev); + + if (!ops->get_sw_write_prot) + return -ENOSYS; + return log_ret(ops->get_sw_write_prot(dev)); +} + /* * TODO(sjg@chromium.org): This is an old-style function. We should remove * it when all SPI flash drivers use dm diff --git a/drivers/mtd/spi/sf_internal.h b/drivers/mtd/spi/sf_internal.h index 26f5c7c995e..46a50444175 100644 --- a/drivers/mtd/spi/sf_internal.h +++ b/drivers/mtd/spi/sf_internal.h @@ -170,6 +170,9 @@ int spi_flash_cmd_write(struct spi_slave *spi, const u8 *cmd, size_t cmd_len, /* Flash erase(sectors) operation, support all possible erase commands */ int spi_flash_cmd_erase_ops(struct spi_flash *flash, u32 offset, size_t len);
+/* Get software write-protect value (BP bits) */ +int spi_flash_cmd_get_sw_write_prot(struct spi_flash *flash); + /* Lock stmicro spi flash region */ int stm_lock(struct spi_flash *flash, u32 ofs, size_t len);
diff --git a/drivers/mtd/spi/sf_probe.c b/drivers/mtd/spi/sf_probe.c index 94fde2ae7a3..5a2e932de8f 100644 --- a/drivers/mtd/spi/sf_probe.c +++ b/drivers/mtd/spi/sf_probe.c @@ -124,6 +124,13 @@ static int spi_flash_std_erase(struct udevice *dev, u32 offset, size_t len) return spi_flash_cmd_erase_ops(flash, offset, len); }
+static int spi_flash_std_get_sw_write_prot(struct udevice *dev) +{ + struct spi_flash *flash = dev_get_uclass_priv(dev); + + return spi_flash_cmd_get_sw_write_prot(flash); +} + static int spi_flash_std_probe(struct udevice *dev) { struct spi_slave *slave = dev_get_parent_priv(dev); @@ -141,6 +148,7 @@ static const struct dm_spi_flash_ops spi_flash_std_ops = { .read = spi_flash_std_read, .write = spi_flash_std_write, .erase = spi_flash_std_erase, + .get_sw_write_prot = spi_flash_std_get_sw_write_prot, };
static const struct udevice_id spi_flash_std_ids[] = { diff --git a/drivers/mtd/spi/spi_flash.c b/drivers/mtd/spi/spi_flash.c index a87bacd4ac7..0c2392f28a4 100644 --- a/drivers/mtd/spi/spi_flash.c +++ b/drivers/mtd/spi/spi_flash.c @@ -110,6 +110,18 @@ static int write_cr(struct spi_flash *flash, u8 wc) } #endif
+int spi_flash_cmd_get_sw_write_prot(struct spi_flash *flash) +{ + u8 status; + int ret; + + ret = read_sr(flash, &status); + if (ret) + return ret; + + return (status >> 2) & 7; +} + #ifdef CONFIG_SPI_FLASH_BAR /* * This "clean_bar" is necessary in a situation when one was accessing diff --git a/include/spi_flash.h b/include/spi_flash.h index 0ec98fb55df..e427e960d54 100644 --- a/include/spi_flash.h +++ b/include/spi_flash.h @@ -112,6 +112,19 @@ struct dm_spi_flash_ops { int (*write)(struct udevice *dev, u32 offset, size_t len, const void *buf); int (*erase)(struct udevice *dev, u32 offset, size_t len); + /** + * get_sw_write_prot() - Check state of software write-protect feature + * + * SPI flash chips can lock a region of the flash defined by a + * 'protected area'. This function checks if this protected area is + * defined. + * + * @dev: SPI flash device + * @return 0 if no region is write-protected, 1 if a region is + * write-protected, -ENOSYS if the driver does not implement this, + * other -ve value on error + */ + int (*get_sw_write_prot)(struct udevice *dev); };
/* Access the serial operations for a device */ @@ -153,6 +166,20 @@ int spi_flash_write_dm(struct udevice *dev, u32 offset, size_t len, */ int spi_flash_erase_dm(struct udevice *dev, u32 offset, size_t len);
+/** + * spl_flash_get_sw_write_prot() - Check state of software write-protect feature + * + * SPI flash chips can lock a region of the flash defined by a + * 'protected area'. This function checks if this protected area is + * defined. + * + * @dev: SPI flash device + * @return 0 if no region is write-protected, 1 if a region is + * write-protected, -ENOSYS if the driver does not implement this, + * other -ve value on error + */ +int spl_flash_get_sw_write_prot(struct udevice *dev); + int spi_flash_probe_bus_cs(unsigned int busnum, unsigned int cs, unsigned int max_hz, unsigned int spi_mode, struct udevice **devp); diff --git a/test/dm/sf.c b/test/dm/sf.c index b23e7f8edd4..35dce4e4c98 100644 --- a/test/dm/sf.c +++ b/test/dm/sf.c @@ -11,6 +11,7 @@ #include <spi.h> #include <spi_flash.h> #include <asm/state.h> +#include <asm/test.h> #include <dm/test.h> #include <dm/util.h> #include <test/ut.h> @@ -45,6 +46,14 @@ static int dm_test_spi_flash(struct unit_test_state *uts) ut_assertok(spi_flash_read_dm(dev, 0, size, dst)); ut_assertok(memcmp(src, dst, size));
+ /* Try the write-protect stuff */ + ut_assertok(uclass_first_device_err(UCLASS_SPI_EMUL, &emul)); + ut_asserteq(0, spl_flash_get_sw_write_prot(dev)); + sandbox_sf_set_block_protect(emul, 1); + ut_asserteq(1, spl_flash_get_sw_write_prot(dev)); + sandbox_sf_set_block_protect(emul, 0); + ut_asserteq(0, spl_flash_get_sw_write_prot(dev)); + /* * Since we are about to destroy all devices, we must tell sandbox * to forget the emulation device