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Diffstat (limited to 'src/soc/mediatek/mt8196/pcie.c')
-rw-r--r--src/soc/mediatek/mt8196/pcie.c57
1 files changed, 57 insertions, 0 deletions
diff --git a/src/soc/mediatek/mt8196/pcie.c b/src/soc/mediatek/mt8196/pcie.c
new file mode 100644
index 0000000000..d307861d96
--- /dev/null
+++ b/src/soc/mediatek/mt8196/pcie.c
@@ -0,0 +1,57 @@
+/* SPDX-License-Identifier: GPL-2.0-only OR MIT */
+
+#include <device/mmio.h>
+#include <gpio.h>
+#include <soc/early_init.h>
+#include <soc/pcie.h>
+
+#define PCIE_REG_BASE_PORT0 0x16940000
+#define PCIE_RST_CTRL_REG (PCIE_REG_BASE_PORT0 + 0x148)
+
+#define PEXTP_CFG_BASE 0x169e0000
+#define PEXTP_SW_RST_REG (PEXTP_CFG_BASE + 0x4)
+#define PEXTP_SW_RST_MAC_P2 BIT(8)
+#define PEXTP_SW_RST_PHY_P2 BIT(9)
+#define PEXTP_REQ_CTRL_0_REG (PEXTP_CFG_BASE + 0x7c)
+#define PEXTP_PCIE26M_BYPASS BIT(4)
+
+static const struct pad_func pcie_pins[2][3] = {
+ {
+ PAD_FUNC_UP(PCIE0_PERSTN, PCIE_PERSTN),
+ PAD_FUNC_UP(PCIE0_WAKEN, PCIE_WAKEN),
+ PAD_FUNC_UP(PCIE0_CLKREQN, PCIE_CLKREQN),
+ },
+ {
+ PAD_FUNC_UP(BPI_D_BUS0, PCIE_WAKEN_1P),
+ PAD_FUNC_UP(BPI_D_BUS1, PCIE_PERSTN_1P),
+ PAD_FUNC_UP(BPI_D_BUS2, PCIE_CLKREQN_1P),
+ },
+};
+
+static void mtk_pcie_set_pinmux(uint8_t port)
+{
+ const struct pad_func *pins = pcie_pins[port];
+ size_t i;
+
+ for (i = 0; i < ARRAY_SIZE(pcie_pins[port]); i++) {
+ gpio_set_mode(pins[i].gpio, pins[i].func);
+ gpio_set_pull(pins[i].gpio, GPIO_PULL_ENABLE, GPIO_PULL_UP);
+ }
+}
+
+void mtk_pcie_pre_init(void)
+{
+ mtk_pcie_set_pinmux(1);
+
+ /* PCIe 2 is not used, assert it's reset for power saving */
+ clrsetbits32p(PEXTP_SW_RST_REG, GENMASK(9, 8),
+ PEXTP_SW_RST_MAC_P2 | PEXTP_SW_RST_PHY_P2);
+
+ /* PCIe 1 and 2 need to bypass PMRC signal */
+ setbits32p(PEXTP_REQ_CTRL_0_REG, PEXTP_PCIE26M_BYPASS);
+
+ /* Assert all reset signals at early stage */
+ mtk_pcie_reset(PCIE_REG_BASE_PORT0, true);
+
+ early_init_save_time(EARLY_INIT_PCIE);
+}