soc/intel/common/block: Update LPC lib

Add support for following functionality:
 1. Set up PCH LPC interrupt routing.
 2. Set up generic IO decoder range settings.
 3. Enable CLKRUN_EN for power gating LPC.

Change-Id: Ib9359765f7293210044b411db49163df0418070a
Signed-off-by: Ravi Sarawadi <ravishankar.sarawadi@intel.com>
Reviewed-on: https://review.coreboot.org/21605
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

1 files changed, 44 insertions, 0 deletions

diff --git a/src/soc/intel/common/block/lpc/lpc_lib.c b/src/soc/intel/common/block/lpc/lpc_lib.c
index c4144cb88b..0fcf383ecb 100644
--- a/src/soc/intel/common/block/lpc/lpc_lib.c
+++ b/src/soc/intel/common/block/lpc/lpc_lib.c
@@ -235,3 +235,47 @@ void lpc_io_setup_comm_a_b(void)
 	/* Enable ComA and ComB Port */
 	lpc_enable_fixed_io_ranges(LPC_IOE_COMA_EN | LPC_IOE_COMB_EN);
 }
+
+static void lpc_set_gen_decode_range(
+	uint32_t gen_io_dec[LPC_NUM_GENERIC_IO_RANGES])
+{
+	size_t i;
+
+	/* Set in PCI generic decode range registers */
+	for (i = 0; i < LPC_NUM_GENERIC_IO_RANGES; i++)
+		pci_write_config32(PCH_DEV_LPC, LPC_GENERIC_IO_RANGE(i),
+			gen_io_dec[i]);
+}
+
+static void pch_lpc_interrupt_init(void)
+{
+	const struct device *dev;
+
+	dev = dev_find_slot(0, PCI_DEVFN(PCH_DEV_SLOT_LPC, 0));
+	if (!dev || !dev->chip_info)
+		return;
+
+	soc_pch_pirq_init(dev);
+}
+
+void pch_enable_lpc(void)
+{
+	/* Lookup device tree in romstage */
+	const struct device *dev;
+	uint32_t gen_io_dec[LPC_NUM_GENERIC_IO_RANGES];
+
+	dev = dev_find_slot(0, PCI_DEVFN(PCH_DEV_SLOT_LPC, 0));
+	if (!dev || !dev->chip_info)
+		return;
+
+	soc_get_gen_io_dec_range(dev, gen_io_dec);
+	lpc_set_gen_decode_range(gen_io_dec);
+	soc_setup_dmi_pcr_io_dec(gen_io_dec);
+	if (ENV_RAMSTAGE)
+		pch_lpc_interrupt_init();
+}
+
+void lpc_enable_pci_clk_cntl(void)
+{
+	pci_write_config8(PCH_DEV_LPC, LPC_PCCTL, LPC_PCCTL_CLKRUN_EN);
+}