diff options
Diffstat (limited to 'src/soc/mediatek/mt8192/pll.c')
| -rw-r--r-- | src/soc/mediatek/mt8192/pll.c | 62 |
1 files changed, 62 insertions, 0 deletions
diff --git a/src/soc/mediatek/mt8192/pll.c b/src/soc/mediatek/mt8192/pll.c index e8849df0b0..11750d20a3 100644 --- a/src/soc/mediatek/mt8192/pll.c +++ b/src/soc/mediatek/mt8192/pll.c @@ -1,8 +1,10 @@ /* SPDX-License-Identifier: GPL-2.0-only */ +#include <console/console.h> #include <device/mmio.h> #include <delay.h> #include <stddef.h> +#include <timer.h> #include <soc/addressmap.h> #include <soc/infracfg.h> @@ -459,3 +461,63 @@ void mt_pll_raise_little_cpu_freq(u32 freq) /* disable [4] intermediate clock armpll_divider_pll1_ck */ clrbits32(&mtk_topckgen->clk_misc_cfg_0, 1 << 4); } + +u32 mt_fmeter_get_freq_khz(enum fmeter_type type, u32 id) +{ + u32 output, count, clk_dbg_cfg, clk_misc_cfg_0; + + /* backup */ + clk_dbg_cfg = read32(&mtk_topckgen->clk_dbg_cfg); + clk_misc_cfg_0 = read32(&mtk_topckgen->clk_misc_cfg_0); + + /* set up frequency meter */ + if (type == FMETER_ABIST) { + SET32_BITFIELDS(&mtk_topckgen->clk_dbg_cfg, + CLK_DBG_CFG_ABIST_CK_SEL, id, + CLK_DBG_CFG_CKGEN_CK_SEL, 0, + CLK_DBG_CFG_METER_CK_SEL, 0); + SET32_BITFIELDS(&mtk_topckgen->clk_misc_cfg_0, + CLK_MISC_CFG_0_METER_DIV, 1); + } else if (type == FMETER_CKGEN) { + SET32_BITFIELDS(&mtk_topckgen->clk_dbg_cfg, + CLK_DBG_CFG_ABIST_CK_SEL, 0, + CLK_DBG_CFG_CKGEN_CK_SEL, id, + CLK_DBG_CFG_METER_CK_SEL, 1); + SET32_BITFIELDS(&mtk_topckgen->clk_misc_cfg_0, + CLK_MISC_CFG_0_METER_DIV, 0); + } else { + die("unsupport fmeter type\n"); + } + + /* enable frequency meter */ + write32(&mtk_topckgen->clk26cali_0, 0x1000); + + /* set load count = 1024-1 */ + SET32_BITFIELDS(&mtk_topckgen->clk26cali_1, CLK26CALI_1_LOAD_CNT, 0x3ff); + + /* trigger frequency meter */ + SET32_BITFIELDS(&mtk_topckgen->clk26cali_0, CLK26CALI_0_TRIGGER, 1); + + /* wait frequency meter until finished */ + if (wait_us(200, !READ32_BITFIELD(&mtk_topckgen->clk26cali_0, CLK26CALI_0_TRIGGER))) { + count = read32(&mtk_topckgen->clk26cali_1) & 0xffff; + output = (count * 26000) / 1024; /* KHz */ + } else { + printk(BIOS_WARNING, "fmeter timeout\n"); + output = 0; + } + + /* disable frequency meter */ + write32(&mtk_topckgen->clk26cali_0, 0x0000); + + /* restore */ + write32(&mtk_topckgen->clk_dbg_cfg, clk_dbg_cfg); + write32(&mtk_topckgen->clk_misc_cfg_0, clk_misc_cfg_0); + + if (type == FMETER_ABIST) + return output * 2; + else if (type == FMETER_CKGEN) + return output; + + return 0; +} |