*/
#include <subdev/clk.h>
+#include <subdev/volt.h>
+#include <subdev/timer.h>
#include <core/device.h>
+#include <core/tegra.h>
#include "priv.h"
#include "gk20a.h"
-#define KHZ (1000)
-#define MHZ (KHZ * 1000)
-
-#define MASK(w) ((1 << (w)) - 1)
+#define GPCPLL_CFG_SYNC_MODE BIT(2)
#define BYPASSCTRL_SYS (SYS_GPCPLL_CFG_BASE + 0x340)
#define BYPASSCTRL_SYS_GPCPLL_SHIFT 0
#define BYPASSCTRL_SYS_GPCPLL_WIDTH 1
+#define GPCPLL_CFG2_SDM_DIN_SHIFT 0
+#define GPCPLL_CFG2_SDM_DIN_WIDTH 8
+#define GPCPLL_CFG2_SDM_DIN_MASK \
+ (MASK(GPCPLL_CFG2_SDM_DIN_WIDTH) << GPCPLL_CFG2_SDM_DIN_SHIFT)
+#define GPCPLL_CFG2_SDM_DIN_NEW_SHIFT 8
+#define GPCPLL_CFG2_SDM_DIN_NEW_WIDTH 15
+#define GPCPLL_CFG2_SDM_DIN_NEW_MASK \
+ (MASK(GPCPLL_CFG2_SDM_DIN_NEW_WIDTH) << GPCPLL_CFG2_SDM_DIN_NEW_SHIFT)
+#define GPCPLL_CFG2_SETUP2_SHIFT 16
+#define GPCPLL_CFG2_PLL_STEPA_SHIFT 24
+
+#define GPCPLL_DVFS0 (SYS_GPCPLL_CFG_BASE + 0x10)
+#define GPCPLL_DVFS0_DFS_COEFF_SHIFT 0
+#define GPCPLL_DVFS0_DFS_COEFF_WIDTH 7
+#define GPCPLL_DVFS0_DFS_COEFF_MASK \
+ (MASK(GPCPLL_DVFS0_DFS_COEFF_WIDTH) << GPCPLL_DVFS0_DFS_COEFF_SHIFT)
+#define GPCPLL_DVFS0_DFS_DET_MAX_SHIFT 8
+#define GPCPLL_DVFS0_DFS_DET_MAX_WIDTH 7
+#define GPCPLL_DVFS0_DFS_DET_MAX_MASK \
+ (MASK(GPCPLL_DVFS0_DFS_DET_MAX_WIDTH) << GPCPLL_DVFS0_DFS_DET_MAX_SHIFT)
+
+#define GPCPLL_DVFS1 (SYS_GPCPLL_CFG_BASE + 0x14)
+#define GPCPLL_DVFS1_DFS_EXT_DET_SHIFT 0
+#define GPCPLL_DVFS1_DFS_EXT_DET_WIDTH 7
+#define GPCPLL_DVFS1_DFS_EXT_STRB_SHIFT 7
+#define GPCPLL_DVFS1_DFS_EXT_STRB_WIDTH 1
+#define GPCPLL_DVFS1_DFS_EXT_CAL_SHIFT 8
+#define GPCPLL_DVFS1_DFS_EXT_CAL_WIDTH 7
+#define GPCPLL_DVFS1_DFS_EXT_SEL_SHIFT 15
+#define GPCPLL_DVFS1_DFS_EXT_SEL_WIDTH 1
+#define GPCPLL_DVFS1_DFS_CTRL_SHIFT 16
+#define GPCPLL_DVFS1_DFS_CTRL_WIDTH 12
+#define GPCPLL_DVFS1_EN_SDM_SHIFT 28
+#define GPCPLL_DVFS1_EN_SDM_WIDTH 1
+#define GPCPLL_DVFS1_EN_SDM_BIT BIT(28)
+#define GPCPLL_DVFS1_EN_DFS_SHIFT 29
+#define GPCPLL_DVFS1_EN_DFS_WIDTH 1
+#define GPCPLL_DVFS1_EN_DFS_BIT BIT(29)
+#define GPCPLL_DVFS1_EN_DFS_CAL_SHIFT 30
+#define GPCPLL_DVFS1_EN_DFS_CAL_WIDTH 1
+#define GPCPLL_DVFS1_EN_DFS_CAL_BIT BIT(30)
+#define GPCPLL_DVFS1_DFS_CAL_DONE_SHIFT 31
+#define GPCPLL_DVFS1_DFS_CAL_DONE_WIDTH 1
+#define GPCPLL_DVFS1_DFS_CAL_DONE_BIT BIT(31)
+
+#define GPC_BCAST_GPCPLL_DVFS2 (GPC_BCAST_GPCPLL_CFG_BASE + 0x20)
+#define GPC_BCAST_GPCPLL_DVFS2_DFS_EXT_STROBE_BIT BIT(16)
+
+#define GPCPLL_CFG3_PLL_DFS_TESTOUT_SHIFT 24
+#define GPCPLL_CFG3_PLL_DFS_TESTOUT_WIDTH 7
+
+#define DFS_DET_RANGE 6 /* -2^6 ... 2^6-1 */
+#define SDM_DIN_RANGE 12 /* -2^12 ... 2^12-1 */
+
+struct gm20b_clk_dvfs_params {
+ s32 coeff_slope;
+ s32 coeff_offs;
+ u32 vco_ctrl;
+};
+
+static const struct gm20b_clk_dvfs_params gm20b_dvfs_params = {
+ .coeff_slope = -165230,
+ .coeff_offs = 214007,
+ .vco_ctrl = 0x7 << 3,
+};
+
+/*
+ * base.n is now the *integer* part of the N factor.
+ * sdm_din contains n's decimal part.
+ */
+struct gm20b_pll {
+ struct gk20a_pll base;
+ u32 sdm_din;
+};
+
+struct gm20b_clk_dvfs {
+ u32 dfs_coeff;
+ s32 dfs_det_max;
+ s32 dfs_ext_cal;
+};
+
+struct gm20b_clk {
+ /* currently applied parameters */
+ struct gk20a_clk base;
+ struct gm20b_clk_dvfs dvfs;
+ u32 uv;
+
+ /* new parameters to apply */
+ struct gk20a_pll new_pll;
+ struct gm20b_clk_dvfs new_dvfs;
+ u32 new_uv;
+
+ const struct gm20b_clk_dvfs_params *dvfs_params;
+
+ /* fused parameters */
+ s32 uvdet_slope;
+ s32 uvdet_offs;
+
+ /* safe frequency we can use at minimum voltage */
+ u32 safe_fmax_vmin;
+};
+#define gm20b_clk(p) container_of((gk20a_clk(p)), struct gm20b_clk, base)
+
static u32 pl_to_div(u32 pl)
{
return pl;
.min_pl = 1, .max_pl = 31,
};
+static void
+gm20b_pllg_read_mnp(struct gm20b_clk *clk, struct gm20b_pll *pll)
+{
+ struct nvkm_subdev *subdev = &clk->base.base.subdev;
+ struct nvkm_device *device = subdev->device;
+ u32 val;
+
+ gk20a_pllg_read_mnp(&clk->base, &pll->base);
+ val = nvkm_rd32(device, GPCPLL_CFG2);
+ pll->sdm_din = (val >> GPCPLL_CFG2_SDM_DIN_SHIFT) &
+ MASK(GPCPLL_CFG2_SDM_DIN_WIDTH);
+}
+
+static void
+gm20b_pllg_write_mnp(struct gm20b_clk *clk, const struct gm20b_pll *pll)
+{
+ struct nvkm_device *device = clk->base.base.subdev.device;
+
+ nvkm_mask(device, GPCPLL_CFG2, GPCPLL_CFG2_SDM_DIN_MASK,
+ pll->sdm_din << GPCPLL_CFG2_SDM_DIN_SHIFT);
+ gk20a_pllg_write_mnp(&clk->base, &pll->base);
+}
+
+/*
+ * Determine DFS_COEFF for the requested voltage. Always select external
+ * calibration override equal to the voltage, and set maximum detection
+ * limit "0" (to make sure that PLL output remains under F/V curve when
+ * voltage increases).
+ */
+static void
+gm20b_dvfs_calc_det_coeff(struct gm20b_clk *clk, s32 uv,
+ struct gm20b_clk_dvfs *dvfs)
+{
+ struct nvkm_subdev *subdev = &clk->base.base.subdev;
+ const struct gm20b_clk_dvfs_params *p = clk->dvfs_params;
+ u32 coeff;
+ /* Work with mv as uv would likely trigger an overflow */
+ s32 mv = DIV_ROUND_CLOSEST(uv, 1000);
+
+ /* coeff = slope * voltage + offset */
+ coeff = DIV_ROUND_CLOSEST(mv * p->coeff_slope, 1000) + p->coeff_offs;
+ coeff = DIV_ROUND_CLOSEST(coeff, 1000);
+ dvfs->dfs_coeff = min_t(u32, coeff, MASK(GPCPLL_DVFS0_DFS_COEFF_WIDTH));
+
+ dvfs->dfs_ext_cal = DIV_ROUND_CLOSEST(uv - clk->uvdet_offs,
+ clk->uvdet_slope);
+ /* should never happen */
+ if (abs(dvfs->dfs_ext_cal) >= BIT(DFS_DET_RANGE))
+ nvkm_error(subdev, "dfs_ext_cal overflow!\n");
+
+ dvfs->dfs_det_max = 0;
+
+ nvkm_debug(subdev, "%s uv: %d coeff: %x, ext_cal: %d, det_max: %d\n",
+ __func__, uv, dvfs->dfs_coeff, dvfs->dfs_ext_cal,
+ dvfs->dfs_det_max);
+}
+
+/*
+ * Solve equation for integer and fractional part of the effective NDIV:
+ *
+ * n_eff = n_int + 1/2 + (SDM_DIN / 2^(SDM_DIN_RANGE + 1)) +
+ * (DVFS_COEFF * DVFS_DET_DELTA) / 2^DFS_DET_RANGE
+ *
+ * The SDM_DIN LSB is finally shifted out, since it is not accessible by sw.
+ */
+static void
+gm20b_dvfs_calc_ndiv(struct gm20b_clk *clk, u32 n_eff, u32 *n_int, u32 *sdm_din)
+{
+ struct nvkm_subdev *subdev = &clk->base.base.subdev;
+ const struct gk20a_clk_pllg_params *p = clk->base.params;
+ u32 n;
+ s32 det_delta;
+ u32 rem, rem_range;
+
+ /* calculate current ext_cal and subtract previous one */
+ det_delta = DIV_ROUND_CLOSEST(((s32)clk->uv) - clk->uvdet_offs,
+ clk->uvdet_slope);
+ det_delta -= clk->dvfs.dfs_ext_cal;
+ det_delta = min(det_delta, clk->dvfs.dfs_det_max);
+ det_delta *= clk->dvfs.dfs_coeff;
+
+ /* integer part of n */
+ n = (n_eff << DFS_DET_RANGE) - det_delta;
+ /* should never happen! */
+ if (n <= 0) {
+ nvkm_error(subdev, "ndiv <= 0 - setting to 1...\n");
+ n = 1 << DFS_DET_RANGE;
+ }
+ if (n >> DFS_DET_RANGE > p->max_n) {
+ nvkm_error(subdev, "ndiv > max_n - setting to max_n...\n");
+ n = p->max_n << DFS_DET_RANGE;
+ }
+ *n_int = n >> DFS_DET_RANGE;
+
+ /* fractional part of n */
+ rem = ((u32)n) & MASK(DFS_DET_RANGE);
+ rem_range = SDM_DIN_RANGE + 1 - DFS_DET_RANGE;
+ /* subtract 2^SDM_DIN_RANGE to account for the 1/2 of the equation */
+ rem = (rem << rem_range) - BIT(SDM_DIN_RANGE);
+ /* lose 8 LSB and clip - sdm_din only keeps the most significant byte */
+ *sdm_din = (rem >> BITS_PER_BYTE) & MASK(GPCPLL_CFG2_SDM_DIN_WIDTH);
+
+ nvkm_debug(subdev, "%s n_eff: %d, n_int: %d, sdm_din: %d\n", __func__,
+ n_eff, *n_int, *sdm_din);
+}
+
+static int
+gm20b_pllg_slide(struct gm20b_clk *clk, u32 n)
+{
+ struct nvkm_subdev *subdev = &clk->base.base.subdev;
+ struct nvkm_device *device = subdev->device;
+ struct gm20b_pll pll;
+ u32 n_int, sdm_din;
+ int ret = 0;
+
+ /* calculate the new n_int/sdm_din for this n/uv */
+ gm20b_dvfs_calc_ndiv(clk, n, &n_int, &sdm_din);
+
+ /* get old coefficients */
+ gm20b_pllg_read_mnp(clk, &pll);
+ /* do nothing if NDIV is the same */
+ if (n_int == pll.base.n && sdm_din == pll.sdm_din)
+ return 0;
+
+ /* pll slowdown mode */
+ nvkm_mask(device, GPCPLL_NDIV_SLOWDOWN,
+ BIT(GPCPLL_NDIV_SLOWDOWN_SLOWDOWN_USING_PLL_SHIFT),
+ BIT(GPCPLL_NDIV_SLOWDOWN_SLOWDOWN_USING_PLL_SHIFT));
+
+ /* new ndiv ready for ramp */
+ /* in DVFS mode SDM is updated via "new" field */
+ nvkm_mask(device, GPCPLL_CFG2, GPCPLL_CFG2_SDM_DIN_NEW_MASK,
+ sdm_din << GPCPLL_CFG2_SDM_DIN_NEW_SHIFT);
+ pll.base.n = n_int;
+ udelay(1);
+ gk20a_pllg_write_mnp(&clk->base, &pll.base);
+
+ /* dynamic ramp to new ndiv */
+ udelay(1);
+ nvkm_mask(device, GPCPLL_NDIV_SLOWDOWN,
+ BIT(GPCPLL_NDIV_SLOWDOWN_EN_DYNRAMP_SHIFT),
+ BIT(GPCPLL_NDIV_SLOWDOWN_EN_DYNRAMP_SHIFT));
+
+ /* wait for ramping to complete */
+ if (nvkm_wait_usec(device, 500, GPC_BCAST_NDIV_SLOWDOWN_DEBUG,
+ GPC_BCAST_NDIV_SLOWDOWN_DEBUG_PLL_DYNRAMP_DONE_SYNCED_MASK,
+ GPC_BCAST_NDIV_SLOWDOWN_DEBUG_PLL_DYNRAMP_DONE_SYNCED_MASK) < 0)
+ ret = -ETIMEDOUT;
+
+ /* in DVFS mode complete SDM update */
+ nvkm_mask(device, GPCPLL_CFG2, GPCPLL_CFG2_SDM_DIN_MASK,
+ sdm_din << GPCPLL_CFG2_SDM_DIN_SHIFT);
+
+ /* exit slowdown mode */
+ nvkm_mask(device, GPCPLL_NDIV_SLOWDOWN,
+ BIT(GPCPLL_NDIV_SLOWDOWN_SLOWDOWN_USING_PLL_SHIFT) |
+ BIT(GPCPLL_NDIV_SLOWDOWN_EN_DYNRAMP_SHIFT), 0);
+ nvkm_rd32(device, GPCPLL_NDIV_SLOWDOWN);
+
+ return ret;
+}
+
+static int
+gm20b_pllg_enable(struct gm20b_clk *clk)
+{
+ struct nvkm_device *device = clk->base.base.subdev.device;
+
+ nvkm_mask(device, GPCPLL_CFG, GPCPLL_CFG_ENABLE, GPCPLL_CFG_ENABLE);
+ nvkm_rd32(device, GPCPLL_CFG);
+
+ /* In DVFS mode lock cannot be used - so just delay */
+ udelay(40);
+
+ /* set SYNC_MODE for glitchless switch out of bypass */
+ nvkm_mask(device, GPCPLL_CFG, GPCPLL_CFG_SYNC_MODE,
+ GPCPLL_CFG_SYNC_MODE);
+ nvkm_rd32(device, GPCPLL_CFG);
+
+ /* switch to VCO mode */
+ nvkm_mask(device, SEL_VCO, BIT(SEL_VCO_GPC2CLK_OUT_SHIFT),
+ BIT(SEL_VCO_GPC2CLK_OUT_SHIFT));
+
+ return 0;
+}
+
+static void
+gm20b_pllg_disable(struct gm20b_clk *clk)
+{
+ struct nvkm_device *device = clk->base.base.subdev.device;
+
+ /* put PLL in bypass before disabling it */
+ nvkm_mask(device, SEL_VCO, BIT(SEL_VCO_GPC2CLK_OUT_SHIFT), 0);
+
+ /* clear SYNC_MODE before disabling PLL */
+ nvkm_mask(device, GPCPLL_CFG, GPCPLL_CFG_SYNC_MODE, 0);
+
+ nvkm_mask(device, GPCPLL_CFG, GPCPLL_CFG_ENABLE, 0);
+ nvkm_rd32(device, GPCPLL_CFG);
+}
+
+static int
+gm20b_pllg_program_mnp(struct gm20b_clk *clk, const struct gk20a_pll *pll)
+{
+ struct nvkm_subdev *subdev = &clk->base.base.subdev;
+ struct nvkm_device *device = subdev->device;
+ struct gm20b_pll cur_pll;
+ u32 n_int, sdm_din;
+ /* if we only change pdiv, we can do a glitchless transition */
+ bool pdiv_only;
+ int ret;
+
+ gm20b_dvfs_calc_ndiv(clk, pll->n, &n_int, &sdm_din);
+ gm20b_pllg_read_mnp(clk, &cur_pll);
+ pdiv_only = cur_pll.base.n == n_int && cur_pll.sdm_din == sdm_din &&
+ cur_pll.base.m == pll->m;
+
+ /* need full sequence if clock not enabled yet */
+ if (!gk20a_pllg_is_enabled(&clk->base))
+ pdiv_only = false;
+
+ /* split VCO-to-bypass jump in half by setting out divider 1:2 */
+ nvkm_mask(device, GPC2CLK_OUT, GPC2CLK_OUT_VCODIV_MASK,
+ GPC2CLK_OUT_VCODIV2 << GPC2CLK_OUT_VCODIV_SHIFT);
+ /* Intentional 2nd write to assure linear divider operation */
+ nvkm_mask(device, GPC2CLK_OUT, GPC2CLK_OUT_VCODIV_MASK,
+ GPC2CLK_OUT_VCODIV2 << GPC2CLK_OUT_VCODIV_SHIFT);
+ nvkm_rd32(device, GPC2CLK_OUT);
+ udelay(2);
+
+ if (pdiv_only) {
+ u32 old = cur_pll.base.pl;
+ u32 new = pll->pl;
+
+ /*
+ * we can do a glitchless transition only if the old and new PL
+ * parameters share at least one bit set to 1. If this is not
+ * the case, calculate and program an interim PL that will allow
+ * us to respect that rule.
+ */
+ if ((old & new) == 0) {
+ cur_pll.base.pl = min(old | BIT(ffs(new) - 1),
+ new | BIT(ffs(old) - 1));
+ gk20a_pllg_write_mnp(&clk->base, &cur_pll.base);
+ }
+
+ cur_pll.base.pl = new;
+ gk20a_pllg_write_mnp(&clk->base, &cur_pll.base);
+ } else {
+ /* disable before programming if more than pdiv changes */
+ gm20b_pllg_disable(clk);
+
+ cur_pll.base = *pll;
+ cur_pll.base.n = n_int;
+ cur_pll.sdm_din = sdm_din;
+ gm20b_pllg_write_mnp(clk, &cur_pll);
+
+ ret = gm20b_pllg_enable(clk);
+ if (ret)
+ return ret;
+ }
+
+ /* restore out divider 1:1 */
+ udelay(2);
+ nvkm_mask(device, GPC2CLK_OUT, GPC2CLK_OUT_VCODIV_MASK,
+ GPC2CLK_OUT_VCODIV1 << GPC2CLK_OUT_VCODIV_SHIFT);
+ /* Intentional 2nd write to assure linear divider operation */
+ nvkm_mask(device, GPC2CLK_OUT, GPC2CLK_OUT_VCODIV_MASK,
+ GPC2CLK_OUT_VCODIV1 << GPC2CLK_OUT_VCODIV_SHIFT);
+ nvkm_rd32(device, GPC2CLK_OUT);
+
+ return 0;
+}
+
+static int
+gm20b_pllg_program_mnp_slide(struct gm20b_clk *clk, const struct gk20a_pll *pll)
+{
+ struct gk20a_pll cur_pll;
+ int ret;
+
+ if (gk20a_pllg_is_enabled(&clk->base)) {
+ gk20a_pllg_read_mnp(&clk->base, &cur_pll);
+
+ /* just do NDIV slide if there is no change to M and PL */
+ if (pll->m == cur_pll.m && pll->pl == cur_pll.pl)
+ return gm20b_pllg_slide(clk, pll->n);
+
+ /* slide down to current NDIV_LO */
+ cur_pll.n = gk20a_pllg_n_lo(&clk->base, &cur_pll);
+ ret = gm20b_pllg_slide(clk, cur_pll.n);
+ if (ret)
+ return ret;
+ }
+
+ /* program MNP with the new clock parameters and new NDIV_LO */
+ cur_pll = *pll;
+ cur_pll.n = gk20a_pllg_n_lo(&clk->base, &cur_pll);
+ ret = gm20b_pllg_program_mnp(clk, &cur_pll);
+ if (ret)
+ return ret;
+
+ /* slide up to new NDIV */
+ return gm20b_pllg_slide(clk, pll->n);
+}
+
+static int
+gm20b_clk_calc(struct nvkm_clk *base, struct nvkm_cstate *cstate)
+{
+ struct gm20b_clk *clk = gm20b_clk(base);
+ struct nvkm_subdev *subdev = &base->subdev;
+ struct nvkm_volt *volt = base->subdev.device->volt;
+ int ret;
+
+ ret = gk20a_pllg_calc_mnp(&clk->base, cstate->domain[nv_clk_src_gpc] *
+ GK20A_CLK_GPC_MDIV, &clk->new_pll);
+ if (ret)
+ return ret;
+
+ clk->new_uv = volt->vid[cstate->voltage].uv;
+ gm20b_dvfs_calc_det_coeff(clk, clk->new_uv, &clk->new_dvfs);
+
+ nvkm_debug(subdev, "%s uv: %d uv\n", __func__, clk->new_uv);
+
+ return 0;
+}
+
+/*
+ * Compute PLL parameters that are always safe for the current voltage
+ */
+static void
+gm20b_dvfs_calc_safe_pll(struct gm20b_clk *clk, struct gk20a_pll *pll)
+{
+ u32 rate = gk20a_pllg_calc_rate(&clk->base, pll) / KHZ;
+ u32 parent_rate = clk->base.parent_rate / KHZ;
+ u32 nmin, nsafe;
+
+ /* remove a safe margin of 10% */
+ if (rate > clk->safe_fmax_vmin)
+ rate = rate * (100 - 10) / 100;
+
+ /* gpc2clk */
+ rate *= 2;
+
+ nmin = DIV_ROUND_UP(pll->m * clk->base.params->min_vco, parent_rate);
+ nsafe = pll->m * rate / (clk->base.parent_rate);
+
+ if (nsafe < nmin) {
+ pll->pl = DIV_ROUND_UP(nmin * parent_rate, pll->m * rate);
+ nsafe = nmin;
+ }
+
+ pll->n = nsafe;
+}
+
+static void
+gm20b_dvfs_program_coeff(struct gm20b_clk *clk, u32 coeff)
+{
+ struct nvkm_device *device = clk->base.base.subdev.device;
+
+ /* strobe to read external DFS coefficient */
+ nvkm_mask(device, GPC_BCAST_GPCPLL_DVFS2,
+ GPC_BCAST_GPCPLL_DVFS2_DFS_EXT_STROBE_BIT,
+ GPC_BCAST_GPCPLL_DVFS2_DFS_EXT_STROBE_BIT);
+
+ nvkm_mask(device, GPCPLL_DVFS0, GPCPLL_DVFS0_DFS_COEFF_MASK,
+ coeff << GPCPLL_DVFS0_DFS_COEFF_SHIFT);
+
+ udelay(1);
+ nvkm_mask(device, GPC_BCAST_GPCPLL_DVFS2,
+ GPC_BCAST_GPCPLL_DVFS2_DFS_EXT_STROBE_BIT, 0);
+}
+
+static void
+gm20b_dvfs_program_ext_cal(struct gm20b_clk *clk, u32 dfs_det_cal)
+{
+ struct nvkm_device *device = clk->base.base.subdev.device;
+ u32 val;
+
+ nvkm_mask(device, GPC_BCAST_GPCPLL_DVFS2, MASK(DFS_DET_RANGE + 1),
+ dfs_det_cal);
+ udelay(1);
+
+ val = nvkm_rd32(device, GPCPLL_DVFS1);
+ if (!(val & BIT(25))) {
+ /* Use external value to overwrite calibration value */
+ val |= BIT(25) | BIT(16);
+ nvkm_wr32(device, GPCPLL_DVFS1, val);
+ }
+}
+
+static void
+gm20b_dvfs_program_dfs_detection(struct gm20b_clk *clk,
+ struct gm20b_clk_dvfs *dvfs)
+{
+ struct nvkm_device *device = clk->base.base.subdev.device;
+
+ /* strobe to read external DFS coefficient */
+ nvkm_mask(device, GPC_BCAST_GPCPLL_DVFS2,
+ GPC_BCAST_GPCPLL_DVFS2_DFS_EXT_STROBE_BIT,
+ GPC_BCAST_GPCPLL_DVFS2_DFS_EXT_STROBE_BIT);
+
+ nvkm_mask(device, GPCPLL_DVFS0,
+ GPCPLL_DVFS0_DFS_COEFF_MASK | GPCPLL_DVFS0_DFS_DET_MAX_MASK,
+ dvfs->dfs_coeff << GPCPLL_DVFS0_DFS_COEFF_SHIFT |
+ dvfs->dfs_det_max << GPCPLL_DVFS0_DFS_DET_MAX_SHIFT);
+
+ udelay(1);
+ nvkm_mask(device, GPC_BCAST_GPCPLL_DVFS2,
+ GPC_BCAST_GPCPLL_DVFS2_DFS_EXT_STROBE_BIT, 0);
+
+ gm20b_dvfs_program_ext_cal(clk, dvfs->dfs_ext_cal);
+}
+
+static int
+gm20b_clk_prog(struct nvkm_clk *base)
+{
+ struct gm20b_clk *clk = gm20b_clk(base);
+ u32 cur_freq;
+ int ret;
+
+ /* No change in DVFS settings? */
+ if (clk->uv == clk->new_uv)
+ goto prog;
+
+ /*
+ * Interim step for changing DVFS detection settings: low enough
+ * frequency to be safe at at DVFS coeff = 0.
+ *
+ * 1. If voltage is increasing:
+ * - safe frequency target matches the lowest - old - frequency
+ * - DVFS settings are still old
+ * - Voltage already increased to new level by volt, but maximum
+ * detection limit assures PLL output remains under F/V curve
+ *
+ * 2. If voltage is decreasing:
+ * - safe frequency target matches the lowest - new - frequency
+ * - DVFS settings are still old
+ * - Voltage is also old, it will be lowered by volt afterwards
+ *
+ * Interim step can be skipped if old frequency is below safe minimum,
+ * i.e., it is low enough to be safe at any voltage in operating range
+ * with zero DVFS coefficient.
+ */
+ cur_freq = nvkm_clk_read(&clk->base.base, nv_clk_src_gpc);
+ if (cur_freq > clk->safe_fmax_vmin) {
+ struct gk20a_pll pll_safe;
+
+ if (clk->uv < clk->new_uv)
+ /* voltage will raise: safe frequency is current one */
+ pll_safe = clk->base.pll;
+ else
+ /* voltage will drop: safe frequency is new one */
+ pll_safe = clk->new_pll;
+
+ gm20b_dvfs_calc_safe_pll(clk, &pll_safe);
+ ret = gm20b_pllg_program_mnp_slide(clk, &pll_safe);
+ if (ret)
+ return ret;
+ }
+
+ /*
+ * DVFS detection settings transition:
+ * - Set DVFS coefficient zero
+ * - Set calibration level to new voltage
+ * - Set DVFS coefficient to match new voltage
+ */
+ gm20b_dvfs_program_coeff(clk, 0);
+ gm20b_dvfs_program_ext_cal(clk, clk->new_dvfs.dfs_ext_cal);
+ gm20b_dvfs_program_coeff(clk, clk->new_dvfs.dfs_coeff);
+ gm20b_dvfs_program_dfs_detection(clk, &clk->new_dvfs);
+
+prog:
+ clk->uv = clk->new_uv;
+ clk->dvfs = clk->new_dvfs;
+ clk->base.pll = clk->new_pll;
+
+ return gm20b_pllg_program_mnp_slide(clk, &clk->base.pll);
+}
+
static struct nvkm_pstate
gm20b_pstates[] = {
{
.voltage = 12,
},
},
-
};
+static void
+gm20b_clk_fini(struct nvkm_clk *base)
+{
+ struct nvkm_device *device = base->subdev.device;
+ struct gm20b_clk *clk = gm20b_clk(base);
+
+ /* slide to VCO min */
+ if (gk20a_pllg_is_enabled(&clk->base)) {
+ struct gk20a_pll pll;
+ u32 n_lo;
+
+ gk20a_pllg_read_mnp(&clk->base, &pll);
+ n_lo = gk20a_pllg_n_lo(&clk->base, &pll);
+ gm20b_pllg_slide(clk, n_lo);
+ }
+
+ gm20b_pllg_disable(clk);
+
+ /* set IDDQ */
+ nvkm_mask(device, GPCPLL_CFG, GPCPLL_CFG_IDDQ, 1);
+}
+
+static int
+gm20b_clk_init_dvfs(struct gm20b_clk *clk)
+{
+ struct nvkm_subdev *subdev = &clk->base.base.subdev;
+ struct nvkm_device *device = subdev->device;
+ bool fused = clk->uvdet_offs && clk->uvdet_slope;
+ static const s32 ADC_SLOPE_UV = 10000; /* default ADC detection slope */
+ u32 data;
+ int ret;
+
+ /* Enable NA DVFS */
+ nvkm_mask(device, GPCPLL_DVFS1, GPCPLL_DVFS1_EN_DFS_BIT,
+ GPCPLL_DVFS1_EN_DFS_BIT);
+
+ /* Set VCO_CTRL */
+ if (clk->dvfs_params->vco_ctrl)
+ nvkm_mask(device, GPCPLL_CFG3, GPCPLL_CFG3_VCO_CTRL_MASK,
+ clk->dvfs_params->vco_ctrl << GPCPLL_CFG3_VCO_CTRL_SHIFT);
+
+ if (fused) {
+ /* Start internal calibration, but ignore results */
+ nvkm_mask(device, GPCPLL_DVFS1, GPCPLL_DVFS1_EN_DFS_CAL_BIT,
+ GPCPLL_DVFS1_EN_DFS_CAL_BIT);
+
+ /* got uvdev parameters from fuse, skip calibration */
+ goto calibrated;
+ }
+
+ /*
+ * If calibration parameters are not fused, start internal calibration,
+ * wait for completion, and use results along with default slope to
+ * calculate ADC offset during boot.
+ */
+ nvkm_mask(device, GPCPLL_DVFS1, GPCPLL_DVFS1_EN_DFS_CAL_BIT,
+ GPCPLL_DVFS1_EN_DFS_CAL_BIT);
+
+ /* Wait for internal calibration done (spec < 2us). */
+ ret = nvkm_wait_usec(device, 10, GPCPLL_DVFS1,
+ GPCPLL_DVFS1_DFS_CAL_DONE_BIT,
+ GPCPLL_DVFS1_DFS_CAL_DONE_BIT);
+ if (ret < 0) {
+ nvkm_error(subdev, "GPCPLL calibration timeout\n");
+ return -ETIMEDOUT;
+ }
+
+ data = nvkm_rd32(device, GPCPLL_CFG3) >>
+ GPCPLL_CFG3_PLL_DFS_TESTOUT_SHIFT;
+ data &= MASK(GPCPLL_CFG3_PLL_DFS_TESTOUT_WIDTH);
+
+ clk->uvdet_slope = ADC_SLOPE_UV;
+ clk->uvdet_offs = ((s32)clk->uv) - data * ADC_SLOPE_UV;
+
+ nvkm_debug(subdev, "calibrated DVFS parameters: offs %d, slope %d\n",
+ clk->uvdet_offs, clk->uvdet_slope);
+
+calibrated:
+ /* Compute and apply initial DVFS parameters */
+ gm20b_dvfs_calc_det_coeff(clk, clk->uv, &clk->dvfs);
+ gm20b_dvfs_program_coeff(clk, 0);
+ gm20b_dvfs_program_ext_cal(clk, clk->dvfs.dfs_ext_cal);
+ gm20b_dvfs_program_coeff(clk, clk->dvfs.dfs_coeff);
+ gm20b_dvfs_program_dfs_detection(clk, &clk->new_dvfs);
+
+ return 0;
+}
+
+/* Forward declaration to detect speedo >=1 in gm20b_clk_init() */
+static const struct nvkm_clk_func gm20b_clk;
+
static int
gm20b_clk_init(struct nvkm_clk *base)
{
struct nvkm_subdev *subdev = &clk->base.subdev;
struct nvkm_device *device = subdev->device;
int ret;
+ u32 data;
- ret = gk20a_clk_setup_slide(clk);
- if (ret)
- return ret;
+ /* get out from IDDQ */
+ nvkm_mask(device, GPCPLL_CFG, GPCPLL_CFG_IDDQ, 0);
+ nvkm_rd32(device, GPCPLL_CFG);
+ udelay(5);
+
+ nvkm_mask(device, GPC2CLK_OUT, GPC2CLK_OUT_INIT_MASK,
+ GPC2CLK_OUT_INIT_VAL);
/* Set the global bypass control to VCO */
nvkm_mask(device, BYPASSCTRL_SYS,
MASK(BYPASSCTRL_SYS_GPCPLL_WIDTH) << BYPASSCTRL_SYS_GPCPLL_SHIFT,
0);
+ ret = gk20a_clk_setup_slide(clk);
+ if (ret)
+ return ret;
+
+ /* If not fused, set RAM SVOP PDP data 0x2, and enable fuse override */
+ data = nvkm_rd32(device, 0x021944);
+ if (!(data & 0x3)) {
+ data |= 0x2;
+ nvkm_wr32(device, 0x021944, data);
+
+ data = nvkm_rd32(device, 0x021948);
+ data |= 0x1;
+ nvkm_wr32(device, 0x021948, data);
+ }
+
+ /* Disable idle slow down */
+ nvkm_mask(device, 0x20160, 0x003f0000, 0x0);
+
+ /* speedo >= 1? */
+ if (clk->base.func == &gm20b_clk) {
+ struct gm20b_clk *_clk = gm20b_clk(base);
+ struct nvkm_volt *volt = device->volt;
+
+ /* Get current voltage */
+ _clk->uv = nvkm_volt_get(volt);
+
+ /* Initialize DVFS */
+ ret = gm20b_clk_init_dvfs(_clk);
+ if (ret)
+ return ret;
+ }
+
/* Start with lowest frequency */
base->func->calc(base, &base->func->pstates[0].base);
- ret = base->func->prog(&clk->base);
+ ret = base->func->prog(base);
if (ret) {
nvkm_error(subdev, "cannot initialize clock\n");
return ret;
.prog = gk20a_clk_prog,
.tidy = gk20a_clk_tidy,
.pstates = gm20b_pstates,
+ /* Speedo 0 only supports 12 voltages */
.nr_pstates = ARRAY_SIZE(gm20b_pstates) - 1,
.domains = {
{ nv_clk_src_crystal, 0xff },
},
};
-int
-gm20b_clk_new(struct nvkm_device *device, int index, struct nvkm_clk **pclk)
+static const struct nvkm_clk_func
+gm20b_clk = {
+ .init = gm20b_clk_init,
+ .fini = gm20b_clk_fini,
+ .read = gk20a_clk_read,
+ .calc = gm20b_clk_calc,
+ .prog = gm20b_clk_prog,
+ .tidy = gk20a_clk_tidy,
+ .pstates = gm20b_pstates,
+ .nr_pstates = ARRAY_SIZE(gm20b_pstates),
+ .domains = {
+ { nv_clk_src_crystal, 0xff },
+ { nv_clk_src_gpc, 0xff, 0, "core", GK20A_CLK_GPC_MDIV },
+ { nv_clk_src_max },
+ },
+};
+
+static int
+gm20b_clk_new_speedo0(struct nvkm_device *device, int index,
+ struct nvkm_clk **pclk)
{
struct gk20a_clk *clk;
int ret;
return ret;
}
+
+/* FUSE register */
+#define FUSE_RESERVED_CALIB0 0x204
+#define FUSE_RESERVED_CALIB0_INTERCEPT_FRAC_SHIFT 0
+#define FUSE_RESERVED_CALIB0_INTERCEPT_FRAC_WIDTH 4
+#define FUSE_RESERVED_CALIB0_INTERCEPT_INT_SHIFT 4
+#define FUSE_RESERVED_CALIB0_INTERCEPT_INT_WIDTH 10
+#define FUSE_RESERVED_CALIB0_SLOPE_FRAC_SHIFT 14
+#define FUSE_RESERVED_CALIB0_SLOPE_FRAC_WIDTH 10
+#define FUSE_RESERVED_CALIB0_SLOPE_INT_SHIFT 24
+#define FUSE_RESERVED_CALIB0_SLOPE_INT_WIDTH 6
+#define FUSE_RESERVED_CALIB0_FUSE_REV_SHIFT 30
+#define FUSE_RESERVED_CALIB0_FUSE_REV_WIDTH 2
+
+static int
+gm20b_clk_init_fused_params(struct gm20b_clk *clk)
+{
+ struct nvkm_subdev *subdev = &clk->base.base.subdev;
+ u32 val = 0;
+ u32 rev = 0;
+
+#if IS_ENABLED(CONFIG_ARCH_TEGRA)
+ tegra_fuse_readl(FUSE_RESERVED_CALIB0, &val);
+ rev = (val >> FUSE_RESERVED_CALIB0_FUSE_REV_SHIFT) &
+ MASK(FUSE_RESERVED_CALIB0_FUSE_REV_WIDTH);
+#endif
+
+ /* No fused parameters, we will calibrate later */
+ if (rev == 0)
+ return -EINVAL;
+
+ /* Integer part in mV + fractional part in uV */
+ clk->uvdet_slope = ((val >> FUSE_RESERVED_CALIB0_SLOPE_INT_SHIFT) &
+ MASK(FUSE_RESERVED_CALIB0_SLOPE_INT_WIDTH)) * 1000 +
+ ((val >> FUSE_RESERVED_CALIB0_SLOPE_FRAC_SHIFT) &
+ MASK(FUSE_RESERVED_CALIB0_SLOPE_FRAC_WIDTH));
+
+ /* Integer part in mV + fractional part in 100uV */
+ clk->uvdet_offs = ((val >> FUSE_RESERVED_CALIB0_INTERCEPT_INT_SHIFT) &
+ MASK(FUSE_RESERVED_CALIB0_INTERCEPT_INT_WIDTH)) * 1000 +
+ ((val >> FUSE_RESERVED_CALIB0_INTERCEPT_FRAC_SHIFT) &
+ MASK(FUSE_RESERVED_CALIB0_INTERCEPT_FRAC_WIDTH)) * 100;
+
+ nvkm_debug(subdev, "fused calibration data: slope %d, offs %d\n",
+ clk->uvdet_slope, clk->uvdet_offs);
+ return 0;
+}
+
+static int
+gm20b_clk_init_safe_fmax(struct gm20b_clk *clk)
+{
+ struct nvkm_subdev *subdev = &clk->base.base.subdev;
+ struct nvkm_volt *volt = subdev->device->volt;
+ struct nvkm_pstate *pstates = clk->base.base.func->pstates;
+ int nr_pstates = clk->base.base.func->nr_pstates;
+ int vmin, id = 0;
+ u32 fmax = 0;
+ int i;
+
+ /* find lowest voltage we can use */
+ vmin = volt->vid[0].uv;
+ for (i = 1; i < volt->vid_nr; i++) {
+ if (volt->vid[i].uv <= vmin) {
+ vmin = volt->vid[i].uv;
+ id = volt->vid[i].vid;
+ }
+ }
+
+ /* find max frequency at this voltage */
+ for (i = 0; i < nr_pstates; i++)
+ if (pstates[i].base.voltage == id)
+ fmax = max(fmax,
+ pstates[i].base.domain[nv_clk_src_gpc]);
+
+ if (!fmax) {
+ nvkm_error(subdev, "failed to evaluate safe fmax\n");
+ return -EINVAL;
+ }
+
+ /* we are safe at 90% of the max frequency */
+ clk->safe_fmax_vmin = fmax * (100 - 10) / 100;
+ nvkm_debug(subdev, "safe fmax @ vmin = %u Khz\n", clk->safe_fmax_vmin);
+
+ return 0;
+}
+
+int
+gm20b_clk_new(struct nvkm_device *device, int index, struct nvkm_clk **pclk)
+{
+ struct nvkm_device_tegra *tdev = device->func->tegra(device);
+ struct gm20b_clk *clk;
+ struct nvkm_subdev *subdev;
+ struct gk20a_clk_pllg_params *clk_params;
+ int ret;
+
+ /* Speedo 0 GPUs cannot use noise-aware PLL */
+ if (tdev->gpu_speedo_id == 0)
+ return gm20b_clk_new_speedo0(device, index, pclk);
+
+ /* Speedo >= 1, use NAPLL */
+ clk = kzalloc(sizeof(*clk) + sizeof(*clk_params), GFP_KERNEL);
+ if (!clk)
+ return -ENOMEM;
+ *pclk = &clk->base.base;
+ subdev = &clk->base.base.subdev;
+
+ /* duplicate the clock parameters since we will patch them below */
+ clk_params = (void *) (clk + 1);
+ *clk_params = gm20b_pllg_params;
+ ret = gk20a_clk_ctor(device, index, &gm20b_clk, clk_params,
+ &clk->base);
+ if (ret)
+ return ret;
+
+ /*
+ * NAPLL can only work with max_u, clamp the m range so
+ * gk20a_pllg_calc_mnp always uses it
+ */
+ clk_params->max_m = clk_params->min_m = DIV_ROUND_UP(clk_params->max_u,
+ (clk->base.parent_rate / KHZ));
+ if (clk_params->max_m == 0) {
+ nvkm_warn(subdev, "cannot use NAPLL, using legacy clock...\n");
+ kfree(clk);
+ return gm20b_clk_new_speedo0(device, index, pclk);
+ }
+
+ clk->base.pl_to_div = pl_to_div;
+ clk->base.div_to_pl = div_to_pl;
+
+ clk->dvfs_params = &gm20b_dvfs_params;
+
+ ret = gm20b_clk_init_fused_params(clk);
+ /*
+ * we will calibrate during init - should never happen on
+ * prod parts
+ */
+ if (ret)
+ nvkm_warn(subdev, "no fused calibration parameters\n");
+
+ ret = gm20b_clk_init_safe_fmax(clk);
+ if (ret)
+ return ret;
+
+ return 0;
+}
projects / platform / kernel / linux-exynos.git / commitdiff