--- /dev/null
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * (C) Copyright 2018-2019 Rockchip Electronics Co., Ltd
+ */
+ #include <common.h>
+#include <bitfield.h>
+#include <clk-uclass.h>
+#include <dm.h>
+#include <errno.h>
+#include <asm/io.h>
+#include <asm/arch-rockchip/clock.h>
+#include <asm/arch-rockchip/hardware.h>
+#include <div64.h>
+
+static struct rockchip_pll_rate_table rockchip_auto_table;
+
+#define PLL_MODE_MASK 0x3
+#define PLL_RK3328_MODE_MASK 0x1
+
+#define RK3036_PLLCON0_FBDIV_MASK 0xfff
+#define RK3036_PLLCON0_FBDIV_SHIFT 0
+#define RK3036_PLLCON0_POSTDIV1_MASK 0x7 << 12
+#define RK3036_PLLCON0_POSTDIV1_SHIFT 12
+#define RK3036_PLLCON1_REFDIV_MASK 0x3f
+#define RK3036_PLLCON1_REFDIV_SHIFT 0
+#define RK3036_PLLCON1_POSTDIV2_MASK 0x7 << 6
+#define RK3036_PLLCON1_POSTDIV2_SHIFT 6
+#define RK3036_PLLCON1_DSMPD_MASK 0x1 << 12
+#define RK3036_PLLCON1_DSMPD_SHIFT 12
+#define RK3036_PLLCON2_FRAC_MASK 0xffffff
+#define RK3036_PLLCON2_FRAC_SHIFT 0
+#define RK3036_PLLCON1_PWRDOWN_SHIT 13
+
+#define MHZ 1000000
+#define KHZ 1000
+enum {
+ OSC_HZ = 24 * 1000000,
+ VCO_MAX_HZ = 3200U * 1000000,
+ VCO_MIN_HZ = 800 * 1000000,
+ OUTPUT_MAX_HZ = 3200U * 1000000,
+ OUTPUT_MIN_HZ = 24 * 1000000,
+};
+
+#define MIN_FOUTVCO_FREQ (800 * MHZ)
+#define MAX_FOUTVCO_FREQ (2000 * MHZ)
+
+int gcd(int m, int n)
+{
+ int t;
+
+ while (m > 0) {
+ if (n > m) {
+ t = m;
+ m = n;
+ n = t;
+ } /* swap */
+ m -= n;
+ }
+ return n;
+}
+
+/*
+ * How to calculate the PLL(from TRM V0.3 Part 1 Page 63):
+ * Formulas also embedded within the Fractional PLL Verilog model:
+ * If DSMPD = 1 (DSM is disabled, "integer mode")
+ * FOUTVCO = FREF / REFDIV * FBDIV
+ * FOUTPOSTDIV = FOUTVCO / POSTDIV1 / POSTDIV2
+ * Where:
+ * FOUTVCO = Fractional PLL non-divided output frequency
+ * FOUTPOSTDIV = Fractional PLL divided output frequency
+ * (output of second post divider)
+ * FREF = Fractional PLL input reference frequency, (the OSC_HZ 24MHz input)
+ * REFDIV = Fractional PLL input reference clock divider
+ * FBDIV = Integer value programmed into feedback divide
+ *
+ */
+
+static int rockchip_pll_clk_set_postdiv(ulong fout_hz,
+ u32 *postdiv1,
+ u32 *postdiv2,
+ u32 *foutvco)
+{
+ ulong freq;
+
+ if (fout_hz < MIN_FOUTVCO_FREQ) {
+ for (*postdiv1 = 1; *postdiv1 <= 7; (*postdiv1)++) {
+ for (*postdiv2 = 1; *postdiv2 <= 7; (*postdiv2)++) {
+ freq = fout_hz * (*postdiv1) * (*postdiv2);
+ if (freq >= MIN_FOUTVCO_FREQ &&
+ freq <= MAX_FOUTVCO_FREQ) {
+ *foutvco = freq;
+ return 0;
+ }
+ }
+ }
+ printf("Can't FIND postdiv1/2 to make fout=%lu in 800~2000M.\n",
+ fout_hz);
+ } else {
+ *postdiv1 = 1;
+ *postdiv2 = 1;
+ }
+ return 0;
+}
+
+static struct rockchip_pll_rate_table *
+rockchip_pll_clk_set_by_auto(ulong fin_hz,
+ ulong fout_hz)
+{
+ struct rockchip_pll_rate_table *rate_table = &rockchip_auto_table;
+ /* FIXME set postdiv1/2 always 1*/
+ u32 foutvco = fout_hz;
+ ulong fin_64, frac_64;
+ u32 f_frac, postdiv1, postdiv2;
+ ulong clk_gcd = 0;
+
+ if (fin_hz == 0 || fout_hz == 0 || fout_hz == fin_hz)
+ return NULL;
+
+ rockchip_pll_clk_set_postdiv(fout_hz, &postdiv1, &postdiv2, &foutvco);
+ rate_table->postdiv1 = postdiv1;
+ rate_table->postdiv2 = postdiv2;
+ rate_table->dsmpd = 1;
+
+ if (fin_hz / MHZ * MHZ == fin_hz && fout_hz / MHZ * MHZ == fout_hz) {
+ fin_hz /= MHZ;
+ foutvco /= MHZ;
+ clk_gcd = gcd(fin_hz, foutvco);
+ rate_table->refdiv = fin_hz / clk_gcd;
+ rate_table->fbdiv = foutvco / clk_gcd;
+
+ rate_table->frac = 0;
+
+ debug("fin = %ld, fout = %ld, clk_gcd = %ld,\n",
+ fin_hz, fout_hz, clk_gcd);
+ debug("refdiv= %d,fbdiv= %d,postdiv1= %d,postdiv2= %d\n",
+ rate_table->refdiv,
+ rate_table->fbdiv, rate_table->postdiv1,
+ rate_table->postdiv2);
+ } else {
+ debug("frac div,fin_hz = %ld,fout_hz = %ld\n",
+ fin_hz, fout_hz);
+ debug("frac get postdiv1 = %d, postdiv2 = %d, foutvco = %d\n",
+ rate_table->postdiv1, rate_table->postdiv2, foutvco);
+ clk_gcd = gcd(fin_hz / MHZ, foutvco / MHZ);
+ rate_table->refdiv = fin_hz / MHZ / clk_gcd;
+ rate_table->fbdiv = foutvco / MHZ / clk_gcd;
+ debug("frac get refdiv = %d, fbdiv = %d\n",
+ rate_table->refdiv, rate_table->fbdiv);
+
+ rate_table->frac = 0;
+
+ f_frac = (foutvco % MHZ);
+ fin_64 = fin_hz;
+ fin_64 = fin_64 / rate_table->refdiv;
+ frac_64 = f_frac << 24;
+ frac_64 = frac_64 / fin_64;
+ rate_table->frac = frac_64;
+ if (rate_table->frac > 0)
+ rate_table->dsmpd = 0;
+ debug("frac = %x\n", rate_table->frac);
+ }
+ return rate_table;
+}
+
+static const struct rockchip_pll_rate_table *
+rockchip_get_pll_settings(struct rockchip_pll_clock *pll, ulong rate)
+{
+ struct rockchip_pll_rate_table *rate_table = pll->rate_table;
+
+ while (rate_table->rate) {
+ if (rate_table->rate == rate)
+ break;
+ rate_table++;
+ }
+ if (rate_table->rate != rate)
+ return rockchip_pll_clk_set_by_auto(24 * MHZ, rate);
+ else
+ return rate_table;
+}
+
+static int rk3036_pll_set_rate(struct rockchip_pll_clock *pll,
+ void __iomem *base, ulong pll_id,
+ ulong drate)
+{
+ const struct rockchip_pll_rate_table *rate;
+
+ rate = rockchip_get_pll_settings(pll, drate);
+ if (!rate) {
+ printf("%s unsupport rate\n", __func__);
+ return -EINVAL;
+ }
+
+ debug("%s: rate settings for %lu fbdiv: %d, postdiv1: %d, refdiv: %d\n",
+ __func__, rate->rate, rate->fbdiv, rate->postdiv1, rate->refdiv);
+ debug("%s: rate settings for %lu postdiv2: %d, dsmpd: %d, frac: %d\n",
+ __func__, rate->rate, rate->postdiv2, rate->dsmpd, rate->frac);
+
+ /*
+ * When power on or changing PLL setting,
+ * we must force PLL into slow mode to ensure output stable clock.
+ */
+ rk_clrsetreg(base + pll->mode_offset,
+ pll->mode_mask << pll->mode_shift,
+ RKCLK_PLL_MODE_SLOW << pll->mode_shift);
+
+ /* Power down */
+ rk_setreg(base + pll->con_offset + 0x4,
+ 1 << RK3036_PLLCON1_PWRDOWN_SHIT);
+
+ rk_clrsetreg(base + pll->con_offset,
+ (RK3036_PLLCON0_POSTDIV1_MASK |
+ RK3036_PLLCON0_FBDIV_MASK),
+ (rate->postdiv1 << RK3036_PLLCON0_POSTDIV1_SHIFT) |
+ rate->fbdiv);
+ rk_clrsetreg(base + pll->con_offset + 0x4,
+ (RK3036_PLLCON1_POSTDIV2_MASK |
+ RK3036_PLLCON1_REFDIV_MASK),
+ (rate->postdiv2 << RK3036_PLLCON1_POSTDIV2_SHIFT |
+ rate->refdiv << RK3036_PLLCON1_REFDIV_SHIFT));
+ if (!rate->dsmpd) {
+ rk_clrsetreg(base + pll->con_offset + 0x4,
+ RK3036_PLLCON1_DSMPD_MASK,
+ rate->dsmpd << RK3036_PLLCON1_DSMPD_SHIFT);
+ writel((readl(base + pll->con_offset + 0x8) &
+ (~RK3036_PLLCON2_FRAC_MASK)) |
+ (rate->frac << RK3036_PLLCON2_FRAC_SHIFT),
+ base + pll->con_offset + 0x8);
+ }
+
+ /* Power Up */
+ rk_clrreg(base + pll->con_offset + 0x4,
+ 1 << RK3036_PLLCON1_PWRDOWN_SHIT);
+
+ /* waiting for pll lock */
+ while (!(readl(base + pll->con_offset + 0x4) & (1 << pll->lock_shift)))
+ udelay(1);
+
+ rk_clrsetreg(base + pll->mode_offset, pll->mode_mask << pll->mode_shift,
+ RKCLK_PLL_MODE_NORMAL << pll->mode_shift);
+ debug("PLL at %p: con0=%x con1= %x con2= %x mode= %x\n",
+ pll, readl(base + pll->con_offset),
+ readl(base + pll->con_offset + 0x4),
+ readl(base + pll->con_offset + 0x8),
+ readl(base + pll->mode_offset));
+
+ return 0;
+}
+
+static ulong rk3036_pll_get_rate(struct rockchip_pll_clock *pll,
+ void __iomem *base, ulong pll_id)
+{
+ u32 refdiv, fbdiv, postdiv1, postdiv2, dsmpd, frac;
+ u32 con = 0, shift, mask;
+ ulong rate;
+
+ con = readl(base + pll->mode_offset);
+ shift = pll->mode_shift;
+ mask = pll->mode_mask << shift;
+
+ switch ((con & mask) >> shift) {
+ case RKCLK_PLL_MODE_SLOW:
+ return OSC_HZ;
+ case RKCLK_PLL_MODE_NORMAL:
+ /* normal mode */
+ con = readl(base + pll->con_offset);
+ postdiv1 = (con & RK3036_PLLCON0_POSTDIV1_MASK) >>
+ RK3036_PLLCON0_POSTDIV1_SHIFT;
+ fbdiv = (con & RK3036_PLLCON0_FBDIV_MASK) >>
+ RK3036_PLLCON0_FBDIV_SHIFT;
+ con = readl(base + pll->con_offset + 0x4);
+ postdiv2 = (con & RK3036_PLLCON1_POSTDIV2_MASK) >>
+ RK3036_PLLCON1_POSTDIV2_SHIFT;
+ refdiv = (con & RK3036_PLLCON1_REFDIV_MASK) >>
+ RK3036_PLLCON1_REFDIV_SHIFT;
+ dsmpd = (con & RK3036_PLLCON1_DSMPD_MASK) >>
+ RK3036_PLLCON1_DSMPD_SHIFT;
+ con = readl(base + pll->con_offset + 0x8);
+ frac = (con & RK3036_PLLCON2_FRAC_MASK) >>
+ RK3036_PLLCON2_FRAC_SHIFT;
+ rate = (24 * fbdiv / (refdiv * postdiv1 * postdiv2)) * 1000000;
+ if (dsmpd == 0) {
+ u64 frac_rate = OSC_HZ * (u64)frac;
+
+ do_div(frac_rate, refdiv);
+ frac_rate >>= 24;
+ do_div(frac_rate, postdiv1);
+ do_div(frac_rate, postdiv1);
+ rate += frac_rate;
+ }
+ return rate;
+ case RKCLK_PLL_MODE_DEEP:
+ default:
+ return 32768;
+ }
+}
+
+ulong rockchip_pll_get_rate(struct rockchip_pll_clock *pll,
+ void __iomem *base,
+ ulong pll_id)
+{
+ ulong rate = 0;
+
+ switch (pll->type) {
+ case pll_rk3036:
+ pll->mode_mask = PLL_MODE_MASK;
+ rate = rk3036_pll_get_rate(pll, base, pll_id);
+ break;
+ case pll_rk3328:
+ pll->mode_mask = PLL_RK3328_MODE_MASK;
+ rate = rk3036_pll_get_rate(pll, base, pll_id);
+ break;
+ default:
+ printf("%s: Unknown pll type for pll clk %ld\n",
+ __func__, pll_id);
+ }
+ return rate;
+}
+
+int rockchip_pll_set_rate(struct rockchip_pll_clock *pll,
+ void __iomem *base, ulong pll_id,
+ ulong drate)
+{
+ int ret = 0;
+
+ if (rockchip_pll_get_rate(pll, base, pll_id) == drate)
+ return 0;
+
+ switch (pll->type) {
+ case pll_rk3036:
+ pll->mode_mask = PLL_MODE_MASK;
+ ret = rk3036_pll_set_rate(pll, base, pll_id, drate);
+ break;
+ case pll_rk3328:
+ pll->mode_mask = PLL_RK3328_MODE_MASK;
+ ret = rk3036_pll_set_rate(pll, base, pll_id, drate);
+ break;
+ default:
+ printf("%s: Unknown pll type for pll clk %ld\n",
+ __func__, pll_id);
+ }
+ return ret;
+}
+
+const struct rockchip_cpu_rate_table *
+rockchip_get_cpu_settings(struct rockchip_cpu_rate_table *cpu_table,
+ ulong rate)
+{
+ struct rockchip_cpu_rate_table *ps = cpu_table;
+
+ while (ps->rate) {
+ if (ps->rate == rate)
+ break;
+ ps++;
+ }
+ if (ps->rate != rate)
+ return NULL;
+ else
+ return ps;
+}
+
projects / platform / kernel / u-boot.git / commitdiff