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authorAamir Bohra <aamir.bohra@intel.com>2017-04-06 11:10:35 +0530
committerMartin Roth <martinroth@google.com>2017-04-10 20:46:17 +0200
commit237a93c43e9d269926f34839ee88f00833701ce6 (patch)
tree47fc3781b00af8ae979942e2c326f77045214366
parent8bf69d307892c65cdc604136146c1a6702956e20 (diff)
downloadcoreboot-237a93c43e9d269926f34839ee88f00833701ce6.tar.xz
soc/intel/common/block: Add LPSS function library
LPSS function library implements common register programming under lpss. Change-Id: I881da01be8191270d9505737f68a6d2d8cd8cc69 Signed-off-by: Aamir Bohra <aamir.bohra@intel.com> Reviewed-on: https://review.coreboot.org/19001 Tested-by: build bot (Jenkins) Reviewed-by: Aaron Durbin <adurbin@chromium.org>
-rw-r--r--src/soc/intel/common/block/include/intelblocks/lpss.h30
-rw-r--r--src/soc/intel/common/block/lpss/Kconfig4
-rw-r--r--src/soc/intel/common/block/lpss/Makefile.inc3
-rw-r--r--src/soc/intel/common/block/lpss/lpss.c60
4 files changed, 97 insertions, 0 deletions
diff --git a/src/soc/intel/common/block/include/intelblocks/lpss.h b/src/soc/intel/common/block/include/intelblocks/lpss.h
new file mode 100644
index 0000000000..03a47144c8
--- /dev/null
+++ b/src/soc/intel/common/block/include/intelblocks/lpss.h
@@ -0,0 +1,30 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2017 Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef SOC_INTEL_COMMON_BLOCK_LPSS_H
+#define SOC_INTEL_COMMON_BLOCK_LPSS_H
+
+#include <stdint.h>
+
+/* Gets controller out of reset */
+void lpss_reset_release(uintptr_t base);
+
+/*
+ * Update clock divider parameters. Clock frequency is
+ * configured as SOC_INTEL_COMMON_LPSS_CLOCK_MHZ * (M / N)
+ */
+void lpss_clk_update(uintptr_t base, uint32_t clk_m_val, uint32_t clk_n_val);
+
+#endif /* SOC_INTEL_COMMON_BLOCK_LPSS_H */
diff --git a/src/soc/intel/common/block/lpss/Kconfig b/src/soc/intel/common/block/lpss/Kconfig
new file mode 100644
index 0000000000..f8ce731ecb
--- /dev/null
+++ b/src/soc/intel/common/block/lpss/Kconfig
@@ -0,0 +1,4 @@
+config SOC_INTEL_COMMON_BLOCK_LPSS
+ bool
+ help
+ Intel Processor common LPSS support
diff --git a/src/soc/intel/common/block/lpss/Makefile.inc b/src/soc/intel/common/block/lpss/Makefile.inc
new file mode 100644
index 0000000000..6c56c6831e
--- /dev/null
+++ b/src/soc/intel/common/block/lpss/Makefile.inc
@@ -0,0 +1,3 @@
+bootblock-$(CONFIG_SOC_INTEL_COMMON_BLOCK_LPSS) += lpss.c
+romstage-$(CONFIG_SOC_INTEL_COMMON_BLOCK_LPSS) += lpss.c
+verstage-$(CONFIG_SOC_INTEL_COMMON_BLOCK_LPSS) += lpss.c \ No newline at end of file
diff --git a/src/soc/intel/common/block/lpss/lpss.c b/src/soc/intel/common/block/lpss/lpss.c
new file mode 100644
index 0000000000..146fdab2ed
--- /dev/null
+++ b/src/soc/intel/common/block/lpss/lpss.c
@@ -0,0 +1,60 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2017 Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <arch/io.h>
+#include <intelblocks/lpss.h>
+
+/* Clock register */
+#define LPSS_CLOCK_CTL_REG 0x200
+#define LPSS_CNT_CLOCK_EN 1
+#define LPSS_CNT_CLK_UPDATE (1 << 31)
+#define LPSS_CLOCK_DIV_N(n) (((n) & 0x7fff) << 16)
+#define LPSS_CLOCK_DIV_M(m) (((m) & 0x7fff) << 1)
+
+/* reset register */
+#define LPSS_RESET_CTL_REG 0x204
+
+/*
+ * Bit 1:0 controls LPSS controller reset.
+ *
+ * 00 ->LPSS Host Controller is in reset (Reset Asserted)
+ * 01/10 ->Reserved
+ * 11 ->LPSS Host Controller is NOT at reset (Reset Released)
+ */
+
+#define LPSS_CNT_RST_RELEASE 3
+
+/* DMA Software Reset Control */
+#define LPSS_DMA_RST_RELEASE (1 << 2)
+
+void lpss_reset_release(uintptr_t base)
+{
+ uint8_t *addr = (void *)base;
+
+ /* Take controller out of reset */
+ write32(addr + LPSS_RESET_CTL_REG, LPSS_CNT_RST_RELEASE);
+}
+
+void lpss_clk_update(uintptr_t base, uint32_t clk_m_val, uint32_t clk_n_val)
+{
+ uint8_t *addr = (void *)base;
+ uint32_t clk_sel;
+
+ addr += LPSS_CLOCK_CTL_REG;
+ clk_sel = LPSS_CLOCK_DIV_N(clk_n_val) | LPSS_CLOCK_DIV_M(clk_m_val);
+
+ write32(addr, clk_sel | LPSS_CNT_CLK_UPDATE);
+ write32(addr, clk_sel | LPSS_CNT_CLOCK_EN);
+}