summaryrefslogtreecommitdiff
path: root/src/soc/sifive
diff options
context:
space:
mode:
Diffstat (limited to 'src/soc/sifive')
-rw-r--r--src/soc/sifive/fu540/clock.c156
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