diff options
| author | Evan Green <evgreen@chromium.org> | 2020-11-27 10:28:36 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-11-27 16:10:06 +0100 |
| commit | 044ee8f85267599a9b0112911f5c16d4548b4289 (patch) | |
| tree | e3d00625cd894db779cf067c46b23780b3d398da /drivers/nvmem | |
| parent | c8b336bb1aeb88baebdf116f151a4afe712512c5 (diff) | |
nvmem: qfprom: Don't touch certain fuses
Some fuse ranges are protected by the XPU such that the AP cannot
access them. Attempting to do so causes an SError. Use the newly
introduced per-soc compatible string, and the newly introduced
nvmem keepout support to attach the set of regions
we should not access.
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Evan Green <evgreen@chromium.org>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20201127102837.19366-5-srinivas.kandagatla@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/nvmem')
| -rw-r--r-- | drivers/nvmem/qfprom.c | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/drivers/nvmem/qfprom.c b/drivers/nvmem/qfprom.c index 5e9e60e2e591..6cace24dfbf7 100644 --- a/drivers/nvmem/qfprom.c +++ b/drivers/nvmem/qfprom.c @@ -12,6 +12,7 @@ #include <linux/mod_devicetable.h> #include <linux/nvmem-provider.h> #include <linux/platform_device.h> +#include <linux/property.h> #include <linux/regulator/consumer.h> /* Blow timer clock frequency in Mhz */ @@ -89,6 +90,28 @@ struct qfprom_touched_values { }; /** + * struct qfprom_soc_compatible_data - Data matched against the SoC + * compatible string. + * + * @keepout: Array of keepout regions for this SoC. + * @nkeepout: Number of elements in the keepout array. + */ +struct qfprom_soc_compatible_data { + const struct nvmem_keepout *keepout; + unsigned int nkeepout; +}; + +static const struct nvmem_keepout sc7180_qfprom_keepout[] = { + {.start = 0x128, .end = 0x148}, + {.start = 0x220, .end = 0x228} +}; + +static const struct qfprom_soc_compatible_data sc7180_qfprom = { + .keepout = sc7180_qfprom_keepout, + .nkeepout = ARRAY_SIZE(sc7180_qfprom_keepout) +}; + +/** * qfprom_disable_fuse_blowing() - Undo enabling of fuse blowing. * @priv: Our driver data. * @old: The data that was stashed from before fuse blowing. @@ -281,6 +304,7 @@ static int qfprom_probe(struct platform_device *pdev) struct device *dev = &pdev->dev; struct resource *res; struct nvmem_device *nvmem; + const struct qfprom_soc_compatible_data *soc_data; struct qfprom_priv *priv; int ret; @@ -299,6 +323,11 @@ static int qfprom_probe(struct platform_device *pdev) econfig.priv = priv; priv->dev = dev; + soc_data = device_get_match_data(dev); + if (soc_data) { + econfig.keepout = soc_data->keepout; + econfig.nkeepout = soc_data->nkeepout; + } /* * If more than one region is provided then the OS has the ability @@ -354,6 +383,7 @@ static int qfprom_probe(struct platform_device *pdev) static const struct of_device_id qfprom_of_match[] = { { .compatible = "qcom,qfprom",}, + { .compatible = "qcom,sc7180-qfprom", .data = &sc7180_qfprom}, {/* sentinel */}, }; MODULE_DEVICE_TABLE(of, qfprom_of_match); |