feat(plat/mdeiatek/mt8195): add DFD control in SiP service
DFD (Design for Debug) is a debugging tool, which scans
flip-flops and dumps to internal RAM on the WDT reset.
After system reboots, those values could be showed for
debugging.
BUG=b:192429713
Change-Id: I02c6c862b6217bc84c83a09b533bd53ec19b06f7
diff --git a/plat/mediatek/mt8195/drivers/dfd/plat_dfd.c b/plat/mediatek/mt8195/drivers/dfd/plat_dfd.c
new file mode 100644
index 0000000..c083318
--- /dev/null
+++ b/plat/mediatek/mt8195/drivers/dfd/plat_dfd.c
@@ -0,0 +1,156 @@
+/*
+ * Copyright (c) 2021, MediaTek Inc. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+#include <arch_helpers.h>
+#include <common/debug.h>
+#include <lib/mmio.h>
+#include <mtk_sip_svc.h>
+#include <plat_dfd.h>
+
+static bool dfd_enabled;
+static uint64_t dfd_base_addr;
+static uint64_t dfd_chain_length;
+static uint64_t dfd_cache_dump;
+
+static void dfd_setup(uint64_t base_addr, uint64_t chain_length,
+ uint64_t cache_dump)
+{
+ mmio_write_32(MTK_WDT_LATCH_CTL2, MTK_WDT_LATCH_CTL2_VAL);
+ mmio_write_32(MTK_WDT_INTERVAL, MTK_WDT_INTERVAL_VAL);
+ mmio_write_32(MTK_DRM_LATCH_CTL2, MTK_DRM_LATCH_CTL2_VAL);
+ mmio_write_32(MTK_DRM_LATCH_CTL1, MTK_DRM_LATCH_CTL1_VAL);
+
+ /* Bit[2] = 0 (default=1), disable dfd apb bus protect_en */
+ mmio_clrbits_32(DFD_O_INTRF_MCU_PWR_CTL_MASK, 0x1 << 2);
+
+ /* Bit[0] : enable?mcusys_vproc?external_off?dfd?trigger -> 1 */
+ mmio_setbits_32(DFD_V50_GROUP_0_63_DIFF, 0x1);
+
+ /* bit[0]: rg_rw_dfd_internal_dump_en -> 1 */
+ /* bit[2]: rg_rw_dfd_clock_stop_en -> 1 */
+ sync_writel(DFD_INTERNAL_CTL, 0x5);
+
+ /* bit[13]: xreset_b_update_disable */
+ mmio_setbits_32(DFD_INTERNAL_CTL, 0x1 << 13);
+
+ /*
+ * bit[10:3]: DFD trigger selection mask
+ * bit[3]: rg_rw_dfd_trigger_sel[0] = 1(enable wdt trigger)
+ * bit[4]: rg_rw_dfd_trigger_sel[1] = 1(enable HW trigger)
+ * bit[5]: rg_rw_dfd_trigger_sel[2] = 1(enable SW trigger)
+ * bit[6]: rg_rw_dfd_trigger_sel[3] = 1(enable SW non-security trigger)
+ * bit[7]: rg_rw_dfd_trigger_sel[4] = 1(enable timer trigger)
+ */
+ mmio_setbits_32(DFD_INTERNAL_CTL, 0x1F << 3);
+
+ /*
+ * bit[9] : rg_rw_dfd_trigger_sel[6] = 1(cpu_eb_sw_dfd_trigger)
+ * bit[10] : rg_rw_dfd_trigger_sel[7] = 1(cpu_eb_wdt_dfd_trigger)
+ */
+ mmio_setbits_32(DFD_INTERNAL_CTL, 0x3 << 9);
+
+ /* bit[20:19]: rg_dfd_armpll_div_mux_sel switch to PLL2 for DFD */
+ mmio_setbits_32(DFD_INTERNAL_CTL, 0x3 << 19);
+
+ /*
+ * bit[0]: rg_rw_dfd_auto_power_on = 1
+ * bit[2:1]: rg_rw_dfd_auto_power_on_dely = 1(10us)
+ * bit[4:2]: rg_rw_dfd_power_on_wait_time = 1(20us)
+ */
+ mmio_write_32(DFD_INTERNAL_PWR_ON, 0xB);
+
+ /* longest scan chain length */
+ mmio_write_32(DFD_CHAIN_LENGTH0, chain_length);
+
+ /* bit[1:0]: rg_rw_dfd_shift_clock_ratio */
+ mmio_write_32(DFD_INTERNAL_SHIFT_CLK_RATIO, 0x0);
+
+ /* rg_dfd_test_so_over_64 */
+ mmio_write_32(DFD_INTERNAL_TEST_SO_OVER_64, 0x1);
+
+ /* DFD3.0 */
+ mmio_write_32(DFD_TEST_SI_0, 0x0);
+ mmio_write_32(DFD_TEST_SI_1, 0x0);
+ mmio_write_32(DFD_TEST_SI_2, 0x0);
+ mmio_write_32(DFD_TEST_SI_3, 0x0);
+
+ /* for iLDO feature */
+ sync_writel(DFD_POWER_CTL, 0xF9);
+
+ /* read offset */
+ sync_writel(DFD_READ_ADDR, DFD_READ_ADDR_VAL);
+
+ /* for DFD-3.0 setup */
+ sync_writel(DFD_V30_CTL, 0xD);
+
+ /* set base address */
+ mmio_write_32(DFD_O_SET_BASEADDR_REG, base_addr >> 24);
+ mmio_write_32(DFD_O_REG_0, 0);
+
+ /* setup global variables for suspend and resume */
+ dfd_enabled = true;
+ dfd_base_addr = base_addr;
+ dfd_chain_length = chain_length;
+ dfd_cache_dump = cache_dump;
+
+ if ((cache_dump & DFD_CACHE_DUMP_ENABLE) != 0UL) {
+ mmio_write_32(MTK_DRM_LATCH_CTL2, MTK_DRM_LATCH_CTL2_CACHE_VAL);
+ sync_writel(DFD_V35_ENABLE, 0x1);
+ sync_writel(DFD_V35_TAP_NUMBER, 0xB);
+ sync_writel(DFD_V35_TAP_EN, DFD_V35_TAP_EN_VAL);
+ sync_writel(DFD_V35_SEQ0_0, DFD_V35_SEQ0_0_VAL);
+
+ /* Cache dump only mode */
+ sync_writel(DFD_V35_CTL, 0x1);
+ mmio_write_32(DFD_INTERNAL_NUM_OF_TEST_SO_GROUP, 0xF);
+ mmio_write_32(DFD_CHAIN_LENGTH0, DFD_CHAIN_LENGTH_VAL);
+ mmio_write_32(DFD_CHAIN_LENGTH1, DFD_CHAIN_LENGTH_VAL);
+ mmio_write_32(DFD_CHAIN_LENGTH2, DFD_CHAIN_LENGTH_VAL);
+ mmio_write_32(DFD_CHAIN_LENGTH3, DFD_CHAIN_LENGTH_VAL);
+
+ if ((cache_dump & DFD_PARITY_ERR_TRIGGER) != 0UL) {
+ sync_writel(DFD_HW_TRIGGER_MASK, 0xC);
+ mmio_setbits_32(DFD_INTERNAL_CTL, 0x1 << 4);
+ }
+ }
+ dsbsy();
+}
+
+void dfd_resume(void)
+{
+ if (dfd_enabled == true) {
+ dfd_setup(dfd_base_addr, dfd_chain_length, dfd_cache_dump);
+ }
+}
+
+uint64_t dfd_smc_dispatcher(uint64_t arg0, uint64_t arg1,
+ uint64_t arg2, uint64_t arg3)
+{
+ uint64_t ret = 0L;
+
+ switch (arg0) {
+ case PLAT_MTK_DFD_SETUP_MAGIC:
+ INFO("[%s] DFD setup call from kernel\n", __func__);
+ dfd_setup(arg1, arg2, arg3);
+ break;
+ case PLAT_MTK_DFD_READ_MAGIC:
+ /* only allow to access DFD register base + 0x200 */
+ if (arg1 <= 0x200) {
+ ret = mmio_read_32(MISC1_CFG_BASE + arg1);
+ }
+ break;
+ case PLAT_MTK_DFD_WRITE_MAGIC:
+ /* only allow to access DFD register base + 0x200 */
+ if (arg1 <= 0x200) {
+ sync_writel(MISC1_CFG_BASE + arg1, arg2);
+ }
+ break;
+ default:
+ ret = MTK_SIP_E_INVALID_PARAM;
+ break;
+ }
+
+ return ret;
+}