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authorrsatapat <rishavnath.satapathy@intel.com>2015-06-24 20:49:16 +0530
committerPatrick Georgi <pgeorgi@google.com>2015-07-21 20:12:11 +0200
commit1b9635de6613548449cd2689d212cd6f01dbfd54 (patch)
tree03125c22c37c3dac80bfe8f9b646feff2c1305b4 /src
parent5c56ce13f4a81970ed8c9a2987c2ea55376da52d (diff)
downloadcoreboot-1b9635de6613548449cd2689d212cd6f01dbfd54.tar.xz
Skylake: Initialize GPIOs for UART2
FSP will initialize GPIOs during TempRamInit. So configure LPSS UART2 GPIOs in native mode after TempRamInit. BRANCH=none BUG=chrome-os-partner:41374 EST=Build and boot on RVP3. Check LPSS logs on UART2 Change-Id: I8016dd76a5bc06e90f9460273be7e83c5e8f8bb1 Signed-off-by: Patrick Georgi <pgeorgi@chromium.org> Original-Commit-Id: eb72e715ef3f566e900727ac8b9494bca1d5971c Original-Change-Id: If1b1a1047ebd5e5f170d91972d11c51aa6fd84a9 Original-Signed-off-by: rsatapat <rishavnath.satapathy@intel.com> Original-Reviewed-on: https://chromium-review.googlesource.com/281604 Original-Reviewed-by: Aaron Durbin <adurbin@chromium.org> Original-Commit-Queue: Wenkai Du <wenkai.du@intel.com> Original-Tested-by: Wenkai Du <wenkai.du@intel.com> Reviewed-on: http://review.coreboot.org/10995 Tested-by: build bot (Jenkins) Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Diffstat (limited to 'src')
-rw-r--r--src/soc/intel/skylake/include/soc/gpio.h12
-rw-r--r--src/soc/intel/skylake/romstage/uart.c64
2 files changed, 74 insertions, 2 deletions
diff --git a/src/soc/intel/skylake/include/soc/gpio.h b/src/soc/intel/skylake/include/soc/gpio.h
index efc666f4cd..03ed11988d 100644
--- a/src/soc/intel/skylake/include/soc/gpio.h
+++ b/src/soc/intel/skylake/include/soc/gpio.h
@@ -257,6 +257,18 @@ typedef struct {
.owner = GPIO_OWNER_GPIO, \
.conf1 = GPIO_SENSE_DISABLE }
+/* Number of pins used by SerialIo controllers */
+#define PCH_SERIAL_IO_PINS_PER_UART_CONTROLLER 4
+#define PCH_SERIAL_IO_PINS_PER_UART_CONTROLLER_NO_FLOW_CTRL 2
+
+/* Below defines are based on GPIO_CONFIG structure fields */
+#define GPIO_CONF_PAD_MODE_MASK 0xF
+#define GPIO_CONF_PAD_MODE_BIT_POS 0
+
+/* GPIO Pad Mode */
+#define B_PCH_GPIO_PAD_MODE (0x1000 | 0x800 | 0x400)
+#define N_PCH_GPIO_PAD_MODE 10
+
struct gpio_config {
u8 gpio;
u32 conf0;
diff --git a/src/soc/intel/skylake/romstage/uart.c b/src/soc/intel/skylake/romstage/uart.c
index 8aa1053150..c53643abc6 100644
--- a/src/soc/intel/skylake/romstage/uart.c
+++ b/src/soc/intel/skylake/romstage/uart.c
@@ -25,6 +25,9 @@
#include <soc/pcr.h>
#include <soc/romstage.h>
#include <soc/serialio.h>
+#include <gpio.h>
+
+static void uartgpioinit(u8 hwflowcontrol);
void pch_uart_init(void)
{
@@ -32,7 +35,7 @@ void pch_uart_init(void)
u32 tmp;
u8 *base = (u8 *)CONFIG_TTYS0_BASE;
- /* Set configured UART base address */
+ /* Set configured UART2 base address */
pci_write_config32(dev, PCI_BASE_ADDRESS_0, (u32)base);
/* Enable memory access and bus master */
@@ -40,7 +43,7 @@ void pch_uart_init(void)
tmp |= PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER;
pci_write_config32(dev, PCI_COMMAND, tmp);
- /* Take UART out of reset */
+ /* Take UART2 out of reset */
tmp = read32(base + SIO_REG_PPR_RESETS);
tmp |= SIO_REG_PPR_RESETS_FUNC | SIO_REG_PPR_RESETS_APB |
SIO_REG_PPR_RESETS_IDMA;
@@ -56,4 +59,61 @@ void pch_uart_init(void)
/* Put UART2 in byte access mode for 16550 compatibility */
pcr_andthenor32(PID_SERIALIO, R_PCH_PCR_SERIAL_IO_GPPRVRW7, 0,
SIO_PCH_LEGACY_UART2);
+
+ /* Configure GPIO for UART2 in native mode*/
+ uartgpioinit(FALSE);
+}
+
+/*
+ * GPIO modes
+ */
+typedef struct {
+ GPIO_PAD pad;
+ GPIO_PAD_MODE mode;
+} GPIO_PAD_NATIVE_FUNCTION;
+
+/*
+ * GPP_C Community for UART2 GPIO
+ * pin order RXD/TXD/RTSB/CTSB
+ */
+static const GPIO_PAD_NATIVE_FUNCTION uartgpio[] = {
+ {GPIO_LP_GPP_C20, GpioPadModeNative1},
+ {GPIO_LP_GPP_C21, GpioPadModeNative1},
+ {GPIO_LP_GPP_C22, GpioPadModeNative1},
+ {GPIO_LP_GPP_C23, GpioPadModeNative1}
+};
+
+/*
+ * GPIO config registers
+ */
+static const GPIO_GROUP_INFO gpio_group_info = {
+ PID_GPIOCOM1,
+ R_PCH_PCR_GPIO_GPP_C_PADCFG_OFFSET,
+ V_PCH_GPIO_GPP_C_PAD_MAX,
+ R_PCH_PCR_GPIO_GPP_C_SMI_STS,
+ R_PCH_PCR_GPIO_GPP_C_SMI_EN
+};
+
+static void uartgpioinit(u8 hwflowcontrol)
+{
+ u32 index, pinsused, dw0reg, dw0regmask, padcfgreg, padnumber;
+
+ if (hwflowcontrol)
+ pinsused = PCH_SERIAL_IO_PINS_PER_UART_CONTROLLER;
+ else
+ pinsused = PCH_SERIAL_IO_PINS_PER_UART_CONTROLLER_NO_FLOW_CTRL;
+
+ for (index = 0; index < pinsused; index++) {
+ padnumber = GPIO_GET_PAD_NUMBER(uartgpio[index].pad);
+ padcfgreg = 0x8 * padnumber + gpio_group_info.padcfgoffset;
+ dw0regmask = (uartgpio[index].mode & GPIO_CONF_PAD_MODE_MASK)
+ >> GPIO_CONF_PAD_MODE_BIT_POS;
+ dw0regmask = (GpioHardwareDefault == dw0regmask) ?
+ 0x0 : B_PCH_GPIO_PAD_MODE;
+ dw0reg = (((uartgpio[index].mode & GPIO_CONF_PAD_MODE_MASK) >>
+ (GPIO_CONF_PAD_MODE_BIT_POS + 1)) << N_PCH_GPIO_PAD_MODE);
+
+ pcr_andthenor32(gpio_group_info.community, padcfgreg,
+ ~(u32)dw0regmask, (u32)dw0reg);
+ }
}