u32 pnor_size;
u32 pnor_base;
bool fwh2ahb;
+ struct regmap *scu;
};
static struct aspeed_lpc_ctrl *file_aspeed_lpc_ctrl(struct file *file)
/*
* Switch to FWH2AHB mode, AST2600 only.
- *
- * 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)
+ 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.
+ */
regmap_write(lpc_ctrl->regmap, HICR6, SW_FWH2AHB);
+ }
/*
* Enable LPC FHW cycles. This is required for the host to
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;