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soc: aspeed: Re-enable FWH2AHB on AST2600

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Recent builds of the vendor u-boot tree disable features of the
BMC that may allow unwanted access if not correctly configured. This
includes the firmware hub to ahb bridge (FWH2AHB), which is used by this
driver.

The bit to "un-disable" it is in the SCU. Set it only when the ioctl is
called and we are running on the ast2600, as to not open up the
'backdoor' unless there's userspace trying to use it.

Fixes: deb50313ba83 ("soc: aspeed-lpc-ctrl: LPC to AHB mapping on ast2600")
Link: https://lore.kernel.org/r/20210629073520.318514-2-joel@jms.id.au
Signed-off-by: Joel Stanley <joel@jms.id.au>
This commit is contained in:
Joel Stanley 2021-06-29 17:05:19 +09:30
parent 8812dff645
commit 2f9b25fa66
1 changed files with 23 additions and 6 deletions
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23
drivers/soc/aspeed/aspeed-lpc-ctrl.c
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@ -37,6 +37,7 @@ struct aspeed_lpc_ctrl {
u32 pnor_size;
u32 pnor_base;
bool fwh2ahb;
struct regmap *scu;
};
static struct aspeed_lpc_ctrl *file_aspeed_lpc_ctrl(struct file *file)
@ -183,13 +184,22 @@ static long aspeed_lpc_ctrl_ioctl(struct file *file, unsigned int cmd,
/*
* Switch to FWH2AHB mode, AST2600 only.
*
*/
if (lpc_ctrl->fwh2ahb) {
/*
* Enable FWH2AHB in SCU debug control register 2. This
* does not turn it on, but makes it available for it
* to be configured in HICR6.
*/
regmap_update_bits(lpc_ctrl->scu, 0x0D8, BIT(2), 0);
/*
* The other bits in this register are interrupt status bits
* that are cleared by writing 1. As we don't want to clear
* them, set only the bit of interest.
*/
if (lpc_ctrl->fwh2ahb)
regmap_write(lpc_ctrl->regmap, HICR6, SW_FWH2AHB);
}
/*
* Enable LPC FHW cycles. This is required for the host to
@ -296,9 +306,16 @@ static int aspeed_lpc_ctrl_probe(struct platform_device *pdev)
return rc;
}
if (of_device_is_compatible(dev->of_node, "aspeed,ast2600-lpc-ctrl"))
if (of_device_is_compatible(dev->of_node, "aspeed,ast2600-lpc-ctrl")) {
lpc_ctrl->fwh2ahb = true;
lpc_ctrl->scu = syscon_regmap_lookup_by_compatible("aspeed,ast2600-scu");
if (IS_ERR(lpc_ctrl->scu)) {
dev_err(dev, "couldn't find scu\n");
return PTR_ERR(lpc_ctrl->scu);
}
}
lpc_ctrl->miscdev.minor = MISC_DYNAMIC_MINOR;
lpc_ctrl->miscdev.name = DEVICE_NAME;
lpc_ctrl->miscdev.fops = &aspeed_lpc_ctrl_fops;