soc/skylake: Move IO decode range out from pch_lpc_init

1. Move existing IO decode range from pch_lpc_init to early
   stage before SIO init.
2. At the same time, enable SIO decode range (0x2e/0x2f)
   for platform which use super IO.

Change-Id: I72df16d0a784686d8cadfbee09b5aef60576ac43
Signed-off-by: Teo Boon Tiong <boon.tiong.teo@intel.com>
Reviewed-on: https://review.coreboot.org/17337
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

src/soc/intel/skylake/bootblock/bootblock.c

@@ -27,6 +27,7 @@ void bootblock_soc_early_init(void)
 	bootblock_systemagent_early_init();
 	bootblock_pch_early_init();
 	bootblock_cpu_init();
+	pch_early_iorange_init();
 
 	if (IS_ENABLED(CONFIG_UART_DEBUG))
 		pch_uart_init();

src/soc/intel/skylake/bootblock/pch.c

@@ -95,17 +95,6 @@ static void pch_enable_lpc(void)
 	/* Lookup device tree in romstage */
 	const struct device *dev;
 	const config_t *config;
-	u16 lpc_en;
-
-	/* IO Decode Range */
-	lpc_en = COMA_RANGE | (COMB_RANGE << 4);
-	pci_write_config16(PCH_DEV_LPC, LPC_IO_DEC, lpc_en);
-	pcr_write16(PID_DMI, R_PCH_PCR_DMI_LPCIOD, lpc_en);
-
-	/* IO Decode Enable */
-	lpc_en = COMA_LPC_EN | KBC_LPC_EN | MC_LPC_EN;
-	pci_write_config16(PCH_DEV_LPC, LPC_EN, lpc_en);
-	pcr_write16(PID_DMI, R_PCH_PCR_DMI_LPCIOE, lpc_en);
 
 	dev = dev_find_slot(0, PCI_DEVFN(PCH_DEV_SLOT_LPC, 0));
 	if (!dev || !dev->chip_info)
@@ -272,6 +261,22 @@ static void enable_heci(void)
 	pci_write_config8(dev, PCI_COMMAND, pcireg);
 }
 
+void pch_early_iorange_init(void)
+{
+	/* Lookup device tree in romstage */
+	u16 lpc_en;
+
+	/* IO Decode Range */
+	lpc_en = COMA_RANGE | (COMB_RANGE << 4);
+	pci_write_config16(PCH_DEV_LPC, LPC_IO_DEC, lpc_en);
+	pcr_write16(PID_DMI, R_PCH_PCR_DMI_LPCIOD, lpc_en);
+
+	/* IO Decode Enable */
+	lpc_en = CNF1_LPC_EN | COMA_LPC_EN | KBC_LPC_EN | MC_LPC_EN;
+	pci_write_config16(PCH_DEV_LPC, LPC_EN, lpc_en);
+	pcr_write16(PID_DMI, R_PCH_PCR_DMI_LPCIOE, lpc_en);
+}
+
 void pch_early_init(void)
 {
 	/*

src/soc/intel/skylake/include/soc/bootblock.h

@@ -32,6 +32,7 @@ void pch_uart_init(void);
 void enable_smbus(void);
 void i2c_early_init(void);
 void pch_early_init(void);
+void pch_early_iorange_init(void);
 void report_platform_info(void);
 void report_memory_config(void);
 void set_max_freq(void);