diff options
Diffstat (limited to 'src/soc/sifive')
| -rw-r--r-- | src/soc/sifive/fu540/clock.c | 156 |
1 files changed, 72 insertions, 84 deletions
diff --git a/src/soc/sifive/fu540/clock.c b/src/soc/sifive/fu540/clock.c index a8b61f1760..8aaba35d6c 100644 --- a/src/soc/sifive/fu540/clock.c +++ b/src/soc/sifive/fu540/clock.c @@ -20,6 +20,9 @@ #include <stdlib.h> #include <stdint.h> +// 33.33 Mhz after reset +#define FU540_BASE_FQY 33330 + struct prci_ctlr { u32 hfxosccfg; /* offset 0x00 */ u32 corepllcfg0; /* offset 0x04 */ @@ -40,33 +43,19 @@ static struct prci_ctlr *prci = (void *)FU540_PRCI; #define PRCI_CORECLK_CORE_PLL 0 #define PRCI_CORECLK_HFCLK 1 -#define PRCI_COREPLLCFG0_LOCK (1u << 31) -#define PRCI_COREPLLCFG0_DIVR_SHIFT 0 -#define PRCI_COREPLLCFG0_DIVF_SHIFT 6 -#define PRCI_COREPLLCFG0_DIVQ_SHIFT 15 -#define PRCI_COREPLLCFG0_RANGE_SHIFT 18 -#define PRCI_COREPLLCFG0_BYPASS_SHIFT 24 -#define PRCI_COREPLLCFG0_FSE_SHIFT 25 -#define PRCI_COREPLLCFG0_DIVR_MASK (0x03f << PRCI_COREPLLCFG0_DIVR_SHIFT) -#define PRCI_COREPLLCFG0_DIVF_MASK (0x1ff << PRCI_COREPLLCFG0_DIVF_SHIFT) -#define PRCI_COREPLLCFG0_DIVQ_MASK (0x007 << PRCI_COREPLLCFG0_DIVQ_SHIFT) -#define PRCI_COREPLLCFG0_RANGE_MASK (0x07 << PRCI_COREPLLCFG0_RANGE_SHIFT) -#define PRCI_COREPLLCFG0_BYPASS_MASK (0x1 << PRCI_COREPLLCFG0_BYPASS_SHIFT) -#define PRCI_COREPLLCFG0_FSE_MASK (0x1 << PRCI_COREPLLCFG0_FSE_SHIFT) - -#define PRCI_DDRPLLCFG0_LOCK (1u << 31) -#define PRCI_DDRPLLCFG0_DIVR_SHIFT 0 -#define PRCI_DDRPLLCFG0_DIVF_SHIFT 6 -#define PRCI_DDRPLLCFG0_DIVQ_SHIFT 15 -#define PRCI_DDRPLLCFG0_RANGE_SHIFT 18 -#define PRCI_DDRPLLCFG0_BYPASS_SHIFT 24 -#define PRCI_DDRPLLCFG0_FSE_SHIFT 25 -#define PRCI_DDRPLLCFG0_DIVR_MASK (0x03f << PRCI_DDRPLLCFG0_DIVR_SHIFT) -#define PRCI_DDRPLLCFG0_DIVF_MASK (0x1ff << PRCI_DDRPLLCFG0_DIVF_SHIFT) -#define PRCI_DDRPLLCFG0_DIVQ_MASK (0x007 << PRCI_DDRPLLCFG0_DIVQ_SHIFT) -#define PRCI_DDRPLLCFG0_RANGE_MASK (0x07 << PRCI_DDRPLLCFG0_RANGE_SHIFT) -#define PRCI_DDRPLLCFG0_BYPASS_MASK (0x1 << PRCI_DDRPLLCFG0_BYPASS_SHIFT) -#define PRCI_DDRPLLCFG0_FSE_MASK (0x1 << PRCI_DDRPLLCFG0_FSE_SHIFT) +#define PRCI_PLLCFG_LOCK (1u << 31) +#define PRCI_PLLCFG_DIVR_SHIFT 0 +#define PRCI_PLLCFG_DIVF_SHIFT 6 +#define PRCI_PLLCFG_DIVQ_SHIFT 15 +#define PRCI_PLLCFG_RANGE_SHIFT 18 +#define PRCI_PLLCFG_BYPASS_SHIFT 24 +#define PRCI_PLLCFG_FSE_SHIFT 25 +#define PRCI_PLLCFG_DIVR_MASK (0x03f << PRCI_PLLCFG_DIVR_SHIFT) +#define PRCI_PLLCFG_DIVF_MASK (0x1ff << PRCI_PLLCFG_DIVF_SHIFT) +#define PRCI_PLLCFG_DIVQ_MASK (0x007 << PRCI_PLLCFG_DIVQ_SHIFT) +#define PRCI_PLLCFG_RANGE_MASK (0x07 << PRCI_PLLCFG_RANGE_SHIFT) +#define PRCI_PLLCFG_BYPASS_MASK (0x1 << PRCI_PLLCFG_BYPASS_SHIFT) +#define PRCI_PLLCFG_FSE_MASK (0x1 << PRCI_PLLCFG_FSE_SHIFT) #define PRCI_DDRPLLCFG1_MASK (1u << 31) @@ -78,6 +67,38 @@ static struct prci_ctlr *prci = (void *)FU540_PRCI; #define PRCI_DEVICESRESET_DDR_PHY_RST_N(x) (((x) & 0x1) << 3) #define PRCI_DEVICESRESET_GEMGXL_RST_N(x) (((x) & 0x1) << 5) +/* Clock initialization should only be done in romstage. */ +#if ENV_ROMSTAGE +struct pll_settings { + unsigned int divr:6; + unsigned int divf:9; + unsigned int divq:3; + unsigned int range:3; + unsigned int bypass:1; + unsigned int fse:1; +}; + +static void configure_pll(u32 *reg, const struct pll_settings *s) +{ + // Write the settings to the register + u32 c = read32(reg); + clrsetbits_le32(&c, PRCI_PLLCFG_DIVR_MASK + | PRCI_PLLCFG_DIVF_MASK | PRCI_PLLCFG_DIVQ_MASK + | PRCI_PLLCFG_RANGE_MASK | PRCI_PLLCFG_BYPASS_MASK + | PRCI_PLLCFG_FSE_MASK, + (s->divr << PRCI_PLLCFG_DIVR_SHIFT) + | (s->divf << PRCI_PLLCFG_DIVF_SHIFT) + | (s->divq << PRCI_PLLCFG_DIVQ_SHIFT) + | (s->range << PRCI_PLLCFG_RANGE_SHIFT) + | (s->bypass << PRCI_PLLCFG_BYPASS_SHIFT) + | (s->fse << PRCI_PLLCFG_FSE_SHIFT)); + write32(reg, c); + + // Wait for PLL lock + while (!(read32(reg) & PRCI_PLLCFG_LOCK)) + ; /* TODO: implement a timeout */ +} + /* * Set coreclk according to the SiFive FU540-C000 Manual * https://www.sifive.com/documentation/chips/freedom-u540-c000-manual/ @@ -88,13 +109,14 @@ static struct prci_ctlr *prci = (void *)FU540_PRCI; * For example, to setup COREPLL for 1 GHz operation, program divr = 0 (x1), * divf = 59 (4000 MHz VCO), divq = 2 (/4 Output divider) */ - -#define PRCI_CORECLK_DIVR 0 -#define PRCI_CORECLK_DIVF 59 -#define PRCI_CORECLK_DIVQ 2 -#define PRCI_CORECLK_RANGE 4 -#define PRCI_CORECLK_BYPASS 0 -#define PRCI_CORECLK_FSE 1 +static const struct pll_settings corepll_settings = { + .divr = 0, + .divf = 59, + .divq = 2, + .range = 4, + .bypass = 0, + .fse = 1, +}; /* * Section 7.4.3: DDR and Ethernet Subsystem Clocking and Reset @@ -110,41 +132,22 @@ static struct prci_ctlr *prci = (void *)FU540_PRCI; * GEMGXLPLL is set up for 125 MHz output frequency. * divr = 0, divf = 59 (4000 MHz VCO), divq = 5 */ +static const struct pll_settings ddrpll_settings = { + .divr = 0, + .divf = 55, + .divq = 2, + .range = 4, + .bypass = 0, + .fse = 1, +}; -#define PRCI_DDRCLK_DIVR 0 -#define PRCI_DDRCLK_DIVF 55 -#define PRCI_DDRCLK_DIVQ 2 -#define PRCI_DDRCLK_RANGE 4 -#define PRCI_DDRCLK_BYPASS 0 -#define PRCI_DDRCLK_FSE 1 - -// 33.33 Mhz after reset -#define FU540_BASE_FQY 33330 - -/* Clock initialization should only be done in romstage. */ -#if ENV_ROMSTAGE static void init_coreclk(void) { // switch coreclk to input reference frequency before modifying PLL clrsetbits_le32(&prci->coreclksel, PRCI_CORECLK_MASK, PRCI_CORECLK_HFCLK); - u32 c = read32(&prci->corepllcfg0); - clrsetbits_le32(&c, PRCI_COREPLLCFG0_DIVR_MASK - | PRCI_COREPLLCFG0_DIVF_MASK | PRCI_COREPLLCFG0_DIVQ_MASK - | PRCI_COREPLLCFG0_RANGE_MASK | PRCI_COREPLLCFG0_BYPASS_MASK - | PRCI_COREPLLCFG0_FSE_MASK, - (PRCI_CORECLK_DIVR << PRCI_COREPLLCFG0_DIVR_SHIFT) - | (PRCI_CORECLK_DIVF << PRCI_COREPLLCFG0_DIVF_SHIFT) - | (PRCI_CORECLK_DIVQ << PRCI_COREPLLCFG0_DIVQ_SHIFT) - | (PRCI_CORECLK_RANGE << PRCI_COREPLLCFG0_RANGE_SHIFT) - | (PRCI_CORECLK_BYPASS << PRCI_COREPLLCFG0_BYPASS_SHIFT) - | (PRCI_CORECLK_FSE << PRCI_COREPLLCFG0_FSE_SHIFT)); - write32(&prci->corepllcfg0, c); - - // wait for PLL lock - while (!(read32(&prci->corepllcfg0) & PRCI_COREPLLCFG0_LOCK)) - ; /* TODO: implement a timeout */ + configure_pll(&prci->corepllcfg0, &corepll_settings); // switch coreclk to use corepll clrsetbits_le32(&prci->coreclksel, PRCI_CORECLK_MASK, @@ -158,22 +161,7 @@ static void init_pll_ddr(void) clrbits_le32(&cfg1, PRCI_DDRPLLCFG1_MASK); write32(&prci->ddrpllcfg1, cfg1); - u32 c = read32(&prci->ddrpllcfg0); - clrsetbits_le32(&c, PRCI_DDRPLLCFG0_DIVR_MASK - | PRCI_DDRPLLCFG0_DIVF_MASK | PRCI_DDRPLLCFG0_DIVQ_MASK - | PRCI_DDRPLLCFG0_RANGE_MASK | PRCI_DDRPLLCFG0_BYPASS_MASK - | PRCI_DDRPLLCFG0_FSE_MASK, - (PRCI_DDRCLK_DIVR << PRCI_DDRPLLCFG0_DIVR_SHIFT) - | (PRCI_DDRCLK_DIVF << PRCI_DDRPLLCFG0_DIVF_SHIFT) - | (PRCI_DDRCLK_DIVQ << PRCI_DDRPLLCFG0_DIVQ_SHIFT) - | (PRCI_DDRCLK_RANGE << PRCI_DDRPLLCFG0_RANGE_SHIFT) - | (PRCI_DDRCLK_BYPASS << PRCI_DDRPLLCFG0_BYPASS_SHIFT) - | (PRCI_DDRCLK_FSE << PRCI_DDRPLLCFG0_FSE_SHIFT)); - write32(&prci->ddrpllcfg0, c); - - // wait for PLL lock - while (!(read32(&prci->ddrpllcfg0) & PRCI_DDRPLLCFG0_LOCK)) - ; /* TODO: implement a timeout */ + configure_pll(&prci->ddrpllcfg0, &ddrpll_settings); // enable ddr clock output setbits_le32(&cfg1, PRCI_DDRPLLCFG1_MASK); @@ -249,12 +237,12 @@ int clock_get_coreclk_khz(void) return FU540_BASE_FQY; u32 cfg = read32(&prci->corepllcfg0); - u32 divr = (cfg & PRCI_COREPLLCFG0_DIVR_MASK) - >> PRCI_COREPLLCFG0_DIVR_SHIFT; - u32 divf = (cfg & PRCI_COREPLLCFG0_DIVF_MASK) - >> PRCI_COREPLLCFG0_DIVF_SHIFT; - u32 divq = (cfg & PRCI_COREPLLCFG0_DIVQ_MASK) - >> PRCI_COREPLLCFG0_DIVQ_SHIFT; + u32 divr = (cfg & PRCI_PLLCFG_DIVR_MASK) + >> PRCI_PLLCFG_DIVR_SHIFT; + u32 divf = (cfg & PRCI_PLLCFG_DIVF_MASK) + >> PRCI_PLLCFG_DIVF_SHIFT; + u32 divq = (cfg & PRCI_PLLCFG_DIVQ_MASK) + >> PRCI_PLLCFG_DIVQ_SHIFT; printk(BIOS_SPEW, "clk: r=%d f=%d q=%d\n", divr, divf, divq); return FU540_BASE_FQY |