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authorFurquan Shaikh <furquan@google.com>2020-06-22 10:45:12 -0700
committerFurquan Shaikh <furquan@google.com>2020-06-25 08:08:37 +0000
commit8302585c152926c086107cdf11f48040d0d873d5 (patch)
tree8d1d1aaa91797d16e5e6e47e7831558d0a52b5b6 /src
parent462f3ed111e049cc95e2ee2ce4f4e88a415cc912 (diff)
downloadcoreboot-8302585c152926c086107cdf11f48040d0d873d5.tar.xz
mb/google/zork: Add support for WiFi power sequencing
This change replaces variant_wifi_romstage_gpio_table() with variant_pcie_power_reset_configure() to handle the reset and power sequencing for WiFi devices pre- and post- v3 version of schematics. These are the requirements that need to be satisfied: 1. As per PCI Express M.2 Specification Revision 3.0, Version 1.2, Section 3.1.4 "Power-up Timing", PERST# should stay disabled until `TPVPGL` time duration after device power has stabilized. Value of TPVPGL is implementation specific. 2. For Intel WiFi chip, it is known to get into a bad state if the above requirement is violated and hence requires a power cycle. 3. On pre-v3 schematics: - For both dalboz and trembyle references, GPIO42 drives WIFI_AUX_RESET_L which is pulled up to PP3300_WIFI. - For both dalboz and trembyle references, PP3300_WIFI is controlled using GPIO29. This pad gets pulled high by default on PWRGOOD because of internal pull-up. But, at RESET# it is known to have a glitch. When GPIO29 gets pulled high, it causes WIFI_AUX_RESET_L to be pulled high as well. This violates the PCIe power sequencing requirements. Hence, for pre-v3 schematics on both dalboz and trembyle, following sequence needs to be followed: a. Assert WIFI_AUX_RESET_L. b. Disable power to WiFi. c. Wait 10ms to allow WiFi power to go low. d. Enable power to WiFi. e. Wait 50ms as per PCIe specification. f. Deassert WIFI_AUX_RESET_L. 4. On v3 schematics: - For trembyle: WIFI_AUX_RESET_L is driven by GPIO86 which has an internal PU as well as an external PU to PP3300_WIFI. - For dalboz: WIFI_AUX_RESET is driven by GPIO29. This is active high and has an internal PU. It also has an external 1K PD to overcome internal PU. - For both dalboz and trembyle references, PP3300_WIFI is controlled by GPIO42 which has an internal PU and external PD. Trembyle schematics have a comment saying strong PD of 2.2K but the stuffed resistor is a weak one (499K). ON dalboz, it uses a weak PD (which doesn't look correct and instead should be a strong PD just like trembyle). Having a strong PD ensures that the WiFi power is kept disabled when coming out of G3 until coreboot configures GPIO42 as high. - Thus, for v3 schematics, following sequence needs to be followed: a. Assert WIFI_AUX_RESET{_L} signal. b. Enable power to WiFi. c. Wait 50ms as per PCIe specification. d. Deassert WIFI_AUX_RESET{_L} signal. BUG=b:157686402, b:158257076 TEST=Verified that QCA and AX200 cards both continue working. Tested QCA on Dalboz and Trembyle. Tested AX200 on morphius. Signed-off-by: Furquan Shaikh <furquan@google.com> Change-Id: I532131ee911d5efb5130d8710f3e01578f6c9627 Reviewed-on: https://review.coreboot.org/c/coreboot/+/42738 Reviewed-by: Aaron Durbin <adurbin@chromium.org> Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Diffstat (limited to 'src')
-rw-r--r--src/mainboard/google/zork/romstage.c3
-rw-r--r--src/mainboard/google/zork/variants/baseboard/gpio_baseboard_dalboz.c89
-rw-r--r--src/mainboard/google/zork/variants/baseboard/gpio_baseboard_trembyle.c89
-rw-r--r--src/mainboard/google/zork/variants/baseboard/include/baseboard/variants.h3
-rw-r--r--src/mainboard/google/zork/variants/berknip/Makefile.inc2
-rw-r--r--src/mainboard/google/zork/variants/berknip/romstage.c27
-rw-r--r--src/mainboard/google/zork/variants/morphius/Makefile.inc2
-rw-r--r--src/mainboard/google/zork/variants/morphius/romstage.c42
8 files changed, 123 insertions, 134 deletions
diff --git a/src/mainboard/google/zork/romstage.c b/src/mainboard/google/zork/romstage.c
index 0e3b2da3c3..9d7b850ae6 100644
--- a/src/mainboard/google/zork/romstage.c
+++ b/src/mainboard/google/zork/romstage.c
@@ -20,8 +20,7 @@ void mainboard_romstage_entry_s3(int s3_resume)
gpios = variant_romstage_gpio_table(&num_gpios);
program_gpios(gpios, num_gpios);
- gpios = variant_wifi_romstage_gpio_table(&num_gpios);
- program_gpios(gpios, num_gpios);
+ variant_pcie_power_reset_configure();
mainboard_ec_init();
diff --git a/src/mainboard/google/zork/variants/baseboard/gpio_baseboard_dalboz.c b/src/mainboard/google/zork/variants/baseboard/gpio_baseboard_dalboz.c
index 50c842b252..35e1829f89 100644
--- a/src/mainboard/google/zork/variants/baseboard/gpio_baseboard_dalboz.c
+++ b/src/mainboard/google/zork/variants/baseboard/gpio_baseboard_dalboz.c
@@ -1,6 +1,8 @@
/* SPDX-License-Identifier: GPL-2.0-or-later */
#include <baseboard/variants.h>
+#include <delay.h>
+#include <gpio.h>
#include <soc/gpio.h>
#include <soc/smi.h>
#include <stdlib.h>
@@ -20,8 +22,6 @@ static const struct soc_amd_gpio gpio_set_stage_rom_pre_v3[] = {
PAD_NF(GPIO_27, PCIE_RST1_L, PULL_NONE),
/* NVME_AUX_RESET_L */
PAD_GPO(GPIO_40, HIGH),
- /* WIFI_AUX_RESET_L */
- PAD_GPO(GPIO_42, HIGH),
/* EN_PWR_TOUCHPAD_PS2 - reset */
PAD_GPO(GPIO_67, LOW),
/* EMMC_RESET - reset (default stuffing unused)*/
@@ -44,11 +44,6 @@ static const struct soc_amd_gpio gpio_set_stage_rom_pre_v3[] = {
PAD_GPO(GPIO_142, HIGH),
};
-static const struct soc_amd_gpio gpio_set_wifi_pre_v3[] = {
- /* EN_PWR_WIFI */
- PAD_GPO(GPIO_29, HIGH),
-};
-
static const struct soc_amd_gpio gpio_set_stage_rom_v3[] = {
/* PEN_POWER_EN - reset */
PAD_GPO(GPIO_5, LOW),
@@ -62,8 +57,6 @@ static const struct soc_amd_gpio gpio_set_stage_rom_v3[] = {
PAD_NF(GPIO_26, PCIE_RST_L, PULL_NONE),
/* PCIE_RST1_L - Variable timings (May remove) */
PAD_NF(GPIO_27, PCIE_RST1_L, PULL_NONE),
- /* WIFI_AUX_RESET */
- PAD_GPO(GPIO_29, LOW),
/* NVME_AUX_RESET_L */
PAD_GPO(GPIO_40, HIGH),
/* EMMC_RESET - reset (default stuffing unused)*/
@@ -86,11 +79,6 @@ static const struct soc_amd_gpio gpio_set_stage_rom_v3[] = {
PAD_GPO(GPIO_142, HIGH),
};
-static const struct soc_amd_gpio gpio_set_wifi_v3[] = {
- /* EN_PWR_WIFI */
- PAD_GPO(GPIO_42, HIGH),
-};
-
static const struct soc_amd_gpio gpio_set_stage_ram[] = {
/* PWR_BTN_L */
@@ -219,21 +207,6 @@ struct soc_amd_gpio *variant_romstage_gpio_table(size_t *size)
}
const __weak
-struct soc_amd_gpio *variant_wifi_romstage_gpio_table(size_t *size)
-{
- uint32_t board_version;
-
- if (!google_chromeec_cbi_get_board_version(&board_version) &&
- (board_version >= CONFIG_VARIANT_MIN_BOARD_ID_V3_SCHEMATICS)) {
- *size = ARRAY_SIZE(gpio_set_wifi_v3);
- return gpio_set_wifi_v3;
- }
-
- *size = ARRAY_SIZE(gpio_set_wifi_pre_v3);
- return gpio_set_wifi_pre_v3;
-}
-
-const __weak
struct soc_amd_gpio *variant_base_gpio_table(size_t *size)
{
*size = ARRAY_SIZE(gpio_set_stage_ram);
@@ -251,3 +224,61 @@ const __weak struct sci_source *get_gpe_table(size_t *num)
{
return NULL;
}
+
+static void wifi_power_reset_configure_v3(void)
+{
+ /*
+ * Configure WiFi GPIOs such that:
+ * - WIFI_AUX_RESET is configured first to assert PERST# to WiFi device.
+ * - Enable power to WiFi using EN_PWR_WIFI.
+ * - Wait for 50ms after power to WiFi is enabled.
+ * - Deassert PERST# to WiFi device by driving WIFI_AUX_RESET low.
+ */
+ static const struct soc_amd_gpio v3_wifi_table[] = {
+ /* WIFI_AUX_RESET */
+ PAD_GPO(GPIO_29, HIGH),
+ /* EN_PWR_WIFI */
+ PAD_GPO(GPIO_42, HIGH),
+ };
+ program_gpios(v3_wifi_table, ARRAY_SIZE(v3_wifi_table));
+
+ mdelay(50);
+ gpio_set(GPIO_29, 0);
+}
+
+static void wifi_power_reset_configure_pre_v3(void)
+{
+ /*
+ * Configure WiFi GPIOs such that:
+ * - WIFI_AUX_RESET_L is configured first to assert PERST# to WiFi device.
+ * - Disable power to WiFi since GPIO_29 goes high on PWRGOOD but has a glitch on RESET#
+ * deassertion causing WiFi to enter a bad state.
+ * - Wait 10ms for WiFi power to go low.
+ * - Enable power to WiFi using EN_PWR_WIFI.
+ * - Wait for 50ms after power to WiFi is enabled.
+ * - Deassert WIFI_AUX_RESET_L.
+ */
+ static const struct soc_amd_gpio pre_v3_wifi_table[] = {
+ /* WIFI_AUX_RESET_L */
+ PAD_GPO(GPIO_42, LOW),
+ /* EN_PWR_WIFI */
+ PAD_GPO(GPIO_29, LOW),
+ };
+ program_gpios(pre_v3_wifi_table, ARRAY_SIZE(pre_v3_wifi_table));
+
+ mdelay(10);
+ gpio_set(GPIO_29, 1);
+ mdelay(50);
+ gpio_set(GPIO_42, 1);
+}
+
+__weak void variant_pcie_power_reset_configure(void)
+{
+ uint32_t board_version;
+
+ if (!google_chromeec_cbi_get_board_version(&board_version) &&
+ (board_version >= CONFIG_VARIANT_MIN_BOARD_ID_V3_SCHEMATICS))
+ wifi_power_reset_configure_v3();
+ else
+ wifi_power_reset_configure_pre_v3();
+}
diff --git a/src/mainboard/google/zork/variants/baseboard/gpio_baseboard_trembyle.c b/src/mainboard/google/zork/variants/baseboard/gpio_baseboard_trembyle.c
index d3f7ae3454..3f02f00e25 100644
--- a/src/mainboard/google/zork/variants/baseboard/gpio_baseboard_trembyle.c
+++ b/src/mainboard/google/zork/variants/baseboard/gpio_baseboard_trembyle.c
@@ -1,6 +1,8 @@
/* SPDX-License-Identifier: GPL-2.0-or-later */
#include <baseboard/variants.h>
+#include <delay.h>
+#include <gpio.h>
#include <soc/gpio.h>
#include <soc/smi.h>
#include <stdlib.h>
@@ -20,8 +22,6 @@ static const struct soc_amd_gpio gpio_set_stage_rom_pre_v3[] = {
PAD_NF(GPIO_27, PCIE_RST1_L, PULL_NONE),
/* NVME_AUX_RESET_L */
PAD_GPO(GPIO_40, HIGH),
- /* WIFI_AUX_RESET_L */
- PAD_GPO(GPIO_42, HIGH),
/* EN_PWR_TOUCHPAD_PS2 - reset */
PAD_GPO(GPIO_67, LOW),
/* EMMC_RESET - reset (default stuffing unused)*/
@@ -42,11 +42,6 @@ static const struct soc_amd_gpio gpio_set_stage_rom_pre_v3[] = {
PAD_GPO(GPIO_142, HIGH),
};
-static const struct soc_amd_gpio gpio_set_wifi_pre_v3[] = {
- /* EN_PWR_WIFI */
- PAD_GPO(GPIO_29, HIGH),
-};
-
static const struct soc_amd_gpio gpio_set_stage_rom_v3[] = {
/* PEN_POWER_EN - reset */
PAD_GPO(GPIO_5, LOW),
@@ -66,8 +61,6 @@ static const struct soc_amd_gpio gpio_set_stage_rom_v3[] = {
PAD_GPO(GPIO_68, HIGH),
/* EN_PWR_CAMERA - reset */
PAD_GPO(GPIO_76, LOW),
- /* WIFI_AUX_RESET_L */
- PAD_GPO(GPIO_86, HIGH),
/* CLK_REQ0_L - WIFI */
PAD_NF(GPIO_92, CLK_REQ0_L, PULL_UP),
/* CLK_REQ1_L - SD Card */
@@ -82,11 +75,6 @@ static const struct soc_amd_gpio gpio_set_stage_rom_v3[] = {
PAD_GPO(GPIO_142, HIGH),
};
-static const struct soc_amd_gpio gpio_set_wifi_v3[] = {
- /* EN_PWR_WIFI */
- PAD_GPO(GPIO_42, HIGH),
-};
-
static const struct soc_amd_gpio gpio_set_stage_ram[] = {
/* PWR_BTN_L */
@@ -214,21 +202,6 @@ struct soc_amd_gpio *variant_romstage_gpio_table(size_t *size)
}
const __weak
-struct soc_amd_gpio *variant_wifi_romstage_gpio_table(size_t *size)
-{
- uint32_t board_version;
-
- if (!google_chromeec_cbi_get_board_version(&board_version) &&
- (board_version >= CONFIG_VARIANT_MIN_BOARD_ID_V3_SCHEMATICS)) {
- *size = ARRAY_SIZE(gpio_set_wifi_v3);
- return gpio_set_wifi_v3;
- }
-
- *size = ARRAY_SIZE(gpio_set_wifi_pre_v3);
- return gpio_set_wifi_pre_v3;
-}
-
-const __weak
struct soc_amd_gpio *variant_base_gpio_table(size_t *size)
{
*size = ARRAY_SIZE(gpio_set_stage_ram);
@@ -246,3 +219,61 @@ const __weak struct sci_source *get_gpe_table(size_t *num)
{
return NULL;
}
+
+static void wifi_power_reset_configure_v3(void)
+{
+ /*
+ * Configure WiFi GPIOs such that:
+ * - WIFI_AUX_RESET_L is configured first to assert PERST# to WiFi device.
+ * - Enable power to WiFi using EN_PWR_WIFI.
+ * - Wait for 50ms after power to WiFi is enabled.
+ * - Deassert WIFI_AUX_RESET_L.
+ */
+ static const struct soc_amd_gpio v3_wifi_table[] = {
+ /* WIFI_AUX_RESET_L */
+ PAD_GPO(GPIO_86, LOW),
+ /* EN_PWR_WIFI */
+ PAD_GPO(GPIO_42, HIGH),
+ };
+ program_gpios(v3_wifi_table, ARRAY_SIZE(v3_wifi_table));
+
+ mdelay(50);
+ gpio_set(GPIO_86, 1);
+}
+
+static void wifi_power_reset_configure_pre_v3(void)
+{
+ /*
+ * Configure WiFi GPIOs such that:
+ * - WIFI_AUX_RESET_L is configured first to assert PERST# to WiFi device.
+ * - Disable power to WiFi since GPIO_29 goes high on PWRGOOD but has a glitch on RESET#
+ * deassertion causing WiFi to enter a bad state.
+ * - Wait 10ms for WiFi power to go low.
+ * - Enable power to WiFi using EN_PWR_WIFI.
+ * - Wait for 50ms after power to WiFi is enabled.
+ * - Deassert WIFI_AUX_RESET_L.
+ */
+ static const struct soc_amd_gpio pre_v3_wifi_table[] = {
+ /* WIFI_AUX_RESET_L */
+ PAD_GPO(GPIO_42, LOW),
+ /* EN_PWR_WIFI */
+ PAD_GPO(GPIO_29, LOW),
+ };
+ program_gpios(pre_v3_wifi_table, ARRAY_SIZE(pre_v3_wifi_table));
+
+ mdelay(10);
+ gpio_set(GPIO_29, 1);
+ mdelay(50);
+ gpio_set(GPIO_42, 1);
+}
+
+__weak void variant_pcie_power_reset_configure(void)
+{
+ uint32_t board_version;
+
+ if (!google_chromeec_cbi_get_board_version(&board_version) &&
+ (board_version >= CONFIG_VARIANT_MIN_BOARD_ID_V3_SCHEMATICS))
+ wifi_power_reset_configure_v3();
+ else
+ wifi_power_reset_configure_pre_v3();
+}
diff --git a/src/mainboard/google/zork/variants/baseboard/include/baseboard/variants.h b/src/mainboard/google/zork/variants/baseboard/include/baseboard/variants.h
index 84a9e9c3d0..4f8f225ad1 100644
--- a/src/mainboard/google/zork/variants/baseboard/include/baseboard/variants.h
+++ b/src/mainboard/google/zork/variants/baseboard/include/baseboard/variants.h
@@ -13,7 +13,6 @@
const struct sci_source *get_gpe_table(size_t *num);
const struct soc_amd_gpio *variant_early_gpio_table(size_t *size);
const struct soc_amd_gpio *variant_romstage_gpio_table(size_t *size);
-const struct soc_amd_gpio *variant_wifi_romstage_gpio_table(size_t *size);
/*
* This function provides base GPIO configuration table. It is typically provided by
* baseboard using a weak implementation. If GPIO configuration for a variant differs
@@ -29,6 +28,8 @@ const struct soc_amd_gpio *variant_override_gpio_table(size_t *size);
void variant_romstage_entry(void);
/* Modify devictree settings during ramstage. */
void variant_devtree_update(void);
+/* Configure PCIe power and reset lines as per variant sequencing requirements. */
+void variant_pcie_power_reset_configure(void);
/* Per variant FSP-S initialization, default implementation in baseboard and
* overrideable by the variant. */
diff --git a/src/mainboard/google/zork/variants/berknip/Makefile.inc b/src/mainboard/google/zork/variants/berknip/Makefile.inc
index b1212bcbdd..57e7136ddc 100644
--- a/src/mainboard/google/zork/variants/berknip/Makefile.inc
+++ b/src/mainboard/google/zork/variants/berknip/Makefile.inc
@@ -2,6 +2,4 @@
subdirs-y += ./spd
-romstage-y += ./romstage.c
-
ramstage-y += gpio.c
diff --git a/src/mainboard/google/zork/variants/berknip/romstage.c b/src/mainboard/google/zork/variants/berknip/romstage.c
deleted file mode 100644
index 67ad31c6d8..0000000000
--- a/src/mainboard/google/zork/variants/berknip/romstage.c
+++ /dev/null
@@ -1,27 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0-only */
-
-#include <stddef.h>
-#include <soc/romstage.h>
-#include <baseboard/variants.h>
-#include <ec/google/chromeec/ec.h>
-
-#include <gpio.h>
-#include <soc/gpio.h>
-#include <variant/gpio.h>
-
-void variant_romstage_entry(void)
-{
- /* Power the wifi card */
- gpio_set(EN_PWR_WIFI, 1);
-}
-
-static const struct soc_amd_gpio berknip_gpio_set_wifi[] = {
- /* EN_PWR_WIFI - Power off. Pull high in romstage.c */
- PAD_GPO(GPIO_29, LOW),
-};
-
-const struct soc_amd_gpio *variant_wifi_romstage_gpio_table(size_t *size)
-{
- *size = ARRAY_SIZE(berknip_gpio_set_wifi);
- return berknip_gpio_set_wifi;
-}
diff --git a/src/mainboard/google/zork/variants/morphius/Makefile.inc b/src/mainboard/google/zork/variants/morphius/Makefile.inc
index b1212bcbdd..57e7136ddc 100644
--- a/src/mainboard/google/zork/variants/morphius/Makefile.inc
+++ b/src/mainboard/google/zork/variants/morphius/Makefile.inc
@@ -2,6 +2,4 @@
subdirs-y += ./spd
-romstage-y += ./romstage.c
-
ramstage-y += gpio.c
diff --git a/src/mainboard/google/zork/variants/morphius/romstage.c b/src/mainboard/google/zork/variants/morphius/romstage.c
deleted file mode 100644
index 876b836adc..0000000000
--- a/src/mainboard/google/zork/variants/morphius/romstage.c
+++ /dev/null
@@ -1,42 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0-or-later */
-
-#include <stddef.h>
-#include <soc/romstage.h>
-#include <baseboard/variants.h>
-#include <ec/google/chromeec/ec.h>
-
-#include <gpio.h>
-#include <soc/gpio.h>
-#include <variant/gpio.h>
-#include <delay.h>
-
-void variant_romstage_entry(void)
-{
- //SET WIFI_PCIE_RESET_L HIGH
- gpio_set(WIFI_PCIE_RESET_L, 1);
-
- /* Power the wifi card */
- /* wait 10ms to discharge EN_PWR_WIFI to 0V */
- mdelay(10);
- gpio_set(EN_PWR_WIFI, 1);
-
- /* SET WIFI_PCIE_RESET_L LOW */
- gpio_set(WIFI_PCIE_RESET_L, 0);
-
- /* Qualcomm Atheros NFA344A needs at least 10ms delay */
- mdelay(10);
-
- /* SET WIFI_PCIE_RESET_L HIGH */
- gpio_set(WIFI_PCIE_RESET_L, 1);
-}
-
-static const struct soc_amd_gpio morphius_gpio_set_wifi[] = {
- /* EN_PWR_WIFI - Power off. Pull high in romstage.c */
- PAD_GPO(GPIO_29, LOW),
-};
-
-const struct soc_amd_gpio *variant_wifi_romstage_gpio_table(size_t *size)
-{
- *size = ARRAY_SIZE(morphius_gpio_set_wifi);
- return morphius_gpio_set_wifi;
-}