aboutsummaryrefslogtreecommitdiffstats
path: root/roms/u-boot/arch/x86/cpu/baytrail/early_uart.c
diff options
context:
space:
mode:
authorAngelos Mouzakitis <a.mouzakitis@virtualopensystems.com>2023-10-10 14:33:42 +0000
committerAngelos Mouzakitis <a.mouzakitis@virtualopensystems.com>2023-10-10 14:33:42 +0000
commitaf1a266670d040d2f4083ff309d732d648afba2a (patch)
tree2fc46203448ddcc6f81546d379abfaeb323575e9 /roms/u-boot/arch/x86/cpu/baytrail/early_uart.c
parente02cda008591317b1625707ff8e115a4841aa889 (diff)
Add submodule dependency filesHEADmaster
Change-Id: Iaf8d18082d3991dec7c0ebbea540f092188eb4ec
Diffstat (limited to 'roms/u-boot/arch/x86/cpu/baytrail/early_uart.c')
-rw-r--r--roms/u-boot/arch/x86/cpu/baytrail/early_uart.c86
1 files changed, 86 insertions, 0 deletions
diff --git a/roms/u-boot/arch/x86/cpu/baytrail/early_uart.c b/roms/u-boot/arch/x86/cpu/baytrail/early_uart.c
new file mode 100644
index 000000000..08dbd5538
--- /dev/null
+++ b/roms/u-boot/arch/x86/cpu/baytrail/early_uart.c
@@ -0,0 +1,86 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2015 Google, Inc
+ */
+
+#include <common.h>
+#include <errno.h>
+#include <asm/io.h>
+
+#define PCI_DEV_CONFIG(segbus, dev, fn) ( \
+ (((segbus) & 0xfff) << 20) | \
+ (((dev) & 0x1f) << 15) | \
+ (((fn) & 0x07) << 12))
+
+/* Platform Controller Unit */
+#define LPC_DEV 0x1f
+#define LPC_FUNC 0
+
+/* Enable UART */
+#define UART_CONT 0x80
+
+/* SCORE Pad definitions */
+#define UART_RXD_PAD 82
+#define UART_TXD_PAD 83
+
+/* Pad base: PAD_CONF0[n]= PAD_BASE + 16 * n */
+#define GPSCORE_PAD_BASE (IO_BASE_ADDRESS + IO_BASE_OFFSET_GPSCORE)
+
+/* IO Memory */
+#define IO_BASE_ADDRESS 0xfed0c000
+#define IO_BASE_OFFSET_GPSCORE 0x0000
+#define IO_BASE_OFFSET_GPNCORE 0x1000
+#define IO_BASE_OFFSET_GPSSUS 0x2000
+#define IO_BASE_SIZE 0x4000
+
+static inline unsigned int score_pconf0(int pad_num)
+{
+ return GPSCORE_PAD_BASE + pad_num * 16;
+}
+
+static void score_select_func(int pad, int func)
+{
+ uint32_t reg;
+ uint32_t pconf0_addr = score_pconf0(pad);
+
+ reg = readl(pconf0_addr);
+ reg &= ~0x7;
+ reg |= func & 0x7;
+ writel(reg, pconf0_addr);
+}
+
+static void x86_pci_write_config32(int dev, unsigned int where, u32 value)
+{
+ unsigned long addr;
+
+ addr = CONFIG_PCIE_ECAM_BASE | dev | (where & ~3);
+ writel(value, addr);
+}
+
+/* This can be called after memory-mapped PCI is working */
+int setup_internal_uart(int enable)
+{
+ /* Enable or disable the legacy UART hardware */
+ x86_pci_write_config32(PCI_DEV_CONFIG(0, LPC_DEV, LPC_FUNC), UART_CONT,
+ enable);
+
+ /* All done for the disable part, so just return */
+ if (!enable)
+ return 0;
+
+ /*
+ * Set up the pads to the UART function. This allows the signals to
+ * leave the chip
+ */
+ score_select_func(UART_RXD_PAD, 1);
+ score_select_func(UART_TXD_PAD, 1);
+
+ /* TODO(sjg@chromium.org): Call debug_uart_init() */
+
+ return 0;
+}
+
+void board_debug_uart_init(void)
+{
+ setup_internal_uart(1);
+}