diff options
Diffstat (limited to 'drivers/mtd')
| -rw-r--r-- | drivers/mtd/devices/st_spi_fsm.c | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/drivers/mtd/devices/st_spi_fsm.c b/drivers/mtd/devices/st_spi_fsm.c index 83cf9dfd02e7..6be267277756 100644 --- a/drivers/mtd/devices/st_spi_fsm.c +++ b/drivers/mtd/devices/st_spi_fsm.c @@ -14,7 +14,9 @@ */ #include <linux/kernel.h> #include <linux/module.h> +#include <linux/regmap.h> #include <linux/platform_device.h> +#include <linux/mfd/syscon.h> #include <linux/mtd/mtd.h> #include <linux/sched.h> #include <linux/delay.h> @@ -207,6 +209,7 @@ struct stfsm { struct flash_info *info; uint32_t fifo_dir_delay; + bool booted_from_spi; }; struct stfsm_seq { @@ -692,6 +695,47 @@ static int stfsm_init(struct stfsm *fsm) return 0; } +static void stfsm_fetch_platform_configs(struct platform_device *pdev) +{ + struct stfsm *fsm = platform_get_drvdata(pdev); + struct device_node *np = pdev->dev.of_node; + struct regmap *regmap; + uint32_t boot_device_reg; + uint32_t boot_device_spi; + uint32_t boot_device; /* Value we read from *boot_device_reg */ + int ret; + + /* Booting from SPI NOR Flash is the default */ + fsm->booted_from_spi = true; + + regmap = syscon_regmap_lookup_by_phandle(np, "st,syscfg"); + if (IS_ERR(regmap)) + goto boot_device_fail; + + /* Where in the syscon the boot device information lives */ + ret = of_property_read_u32(np, "st,boot-device-reg", &boot_device_reg); + if (ret) + goto boot_device_fail; + + /* Boot device value when booted from SPI NOR */ + ret = of_property_read_u32(np, "st,boot-device-spi", &boot_device_spi); + if (ret) + goto boot_device_fail; + + ret = regmap_read(regmap, boot_device_reg, &boot_device); + if (ret) + goto boot_device_fail; + + if (boot_device != boot_device_spi) + fsm->booted_from_spi = false; + + return; + +boot_device_fail: + dev_warn(&pdev->dev, + "failed to fetch boot device, assuming boot from SPI\n"); +} + static int stfsm_probe(struct platform_device *pdev) { struct device_node *np = pdev->dev.of_node; @@ -734,6 +778,8 @@ static int stfsm_probe(struct platform_device *pdev) return ret; } + stfsm_fetch_platform_configs(pdev); + /* Detect SPI FLASH device */ info = stfsm_jedec_probe(fsm); if (!info) |