Include nvgpu headers

These are needed to build on NVIDIA's Jetson boards for the time
being. Only a couple structs are required, so it should be fairly
easy to remove this dependency at some point in the future.

1 files changed, 286 insertions, 0 deletions

diff --git a/include/os/linux/clk.c b/include/os/linux/clk.c
new file mode 100644
index 0000000..e9796ea
--- /dev/null
+++ b/include/os/linux/clk.c
@@ -0,0 +1,286 @@
+/*
+ * Linux clock support
+ *
+ * Copyright (c) 2017-2019, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/clk.h>
+
+#include <soc/tegra/tegra-dvfs.h>
+#include <soc/tegra/tegra-bpmp-dvfs.h>
+
+#include "clk.h"
+#include "os_linux.h"
+#include "platform_gk20a.h"
+
+#include <nvgpu/gk20a.h>
+#include <nvgpu/clk_arb.h>
+
+#define HZ_TO_MHZ(x) ((x) / 1000000)
+
+static unsigned long nvgpu_linux_clk_get_rate(struct gk20a *g, u32 api_domain)
+{
+        struct gk20a_platform *platform = gk20a_get_platform(dev_from_gk20a(g));
+        unsigned long ret;
+
+        switch (api_domain) {
+        case CTRL_CLK_DOMAIN_GPCCLK:
+                if (g->clk.tegra_clk)
+                        ret = clk_get_rate(g->clk.tegra_clk);
+                else
+                        ret = clk_get_rate(platform->clk[0]);
+                break;
+        case CTRL_CLK_DOMAIN_PWRCLK:
+                ret = clk_get_rate(platform->clk[1]);
+                break;
+        default:
+                nvgpu_err(g, "unknown clock: %u", api_domain);
+                ret = 0;
+                break;
+        }
+
+        return ret;
+}
+
+static int nvgpu_linux_clk_set_rate(struct gk20a *g,
+                                     u32 api_domain, unsigned long rate)
+{
+        struct gk20a_platform *platform = gk20a_get_platform(dev_from_gk20a(g));
+        int ret;
+
+        switch (api_domain) {
+        case CTRL_CLK_DOMAIN_GPCCLK:
+                if (g->clk.tegra_clk)
+                        ret = clk_set_rate(g->clk.tegra_clk, rate);
+                else
+                        ret = clk_set_rate(platform->clk[0], rate);
+                break;
+        case CTRL_CLK_DOMAIN_PWRCLK:
+                ret = clk_set_rate(platform->clk[1], rate);
+                break;
+        default:
+                nvgpu_err(g, "unknown clock: %u", api_domain);
+                ret = -EINVAL;
+                break;
+        }
+
+        return ret;
+}
+
+static unsigned long nvgpu_linux_get_fmax_at_vmin_safe(struct gk20a *g)
+{
+        struct gk20a_platform *platform = gk20a_get_platform(dev_from_gk20a(g));
+
+        /*
+         * On Tegra platforms with GPCPLL bus (gbus) GPU tegra_clk clock exposed
+         * to frequency governor is a shared user on the gbus. The latter can be
+         * accessed as GPU clock parent, and incorporate DVFS related data.
+         */
+        if (g->clk.tegra_clk)
+                return tegra_dvfs_get_fmax_at_vmin_safe_t(
+                        g->clk.tegra_clk_parent);
+
+        if (platform->maxmin_clk_id)
+                return tegra_bpmp_dvfs_get_fmax_at_vmin(
+                        platform->maxmin_clk_id);
+
+        return 0;
+}
+
+static u32 nvgpu_linux_get_ref_clock_rate(struct gk20a *g)
+{
+        struct clk *c;
+
+        c = clk_get_sys("gpu_ref", "gpu_ref");
+        if (IS_ERR(c)) {
+                nvgpu_err(g, "failed to get GPCPLL reference clock");
+                return 0;
+        }
+
+        return clk_get_rate(c);
+}
+
+static int nvgpu_linux_predict_mv_at_hz_cur_tfloor(struct clk_gk20a *clk,
+        unsigned long rate)
+{
+        return tegra_dvfs_predict_mv_at_hz_cur_tfloor(
+                                clk->tegra_clk_parent, rate);
+}
+
+static unsigned long nvgpu_linux_get_maxrate(struct gk20a *g, u32 api_domain)
+{
+        int ret;
+        u16 min_mhz, max_mhz;
+
+        switch (api_domain) {
+        case CTRL_CLK_DOMAIN_GPCCLK:
+                ret = tegra_dvfs_get_maxrate(g->clk.tegra_clk_parent);
+                /* If dvfs not supported */
+                if (ret == 0) {
+                        int err = nvgpu_clk_arb_get_arbiter_clk_range(g,
+                                        NVGPU_CLK_DOMAIN_GPCCLK,
+                                        &min_mhz, &max_mhz);
+                        if (err == 0) {
+                                ret = max_mhz * 1000000L;
+                        }
+                }
+                break;
+        default:
+                nvgpu_err(g, "unknown clock: %u", api_domain);
+                ret = 0;
+                break;
+        }
+
+        return ret;
+}
+
+/*
+ * This API is used to return a list of supported frequencies by igpu.
+ * Set *num_points as 0 to get the size of the freqs list, returned
+ * by *num_points itself. freqs array must be provided by caller.
+ * If *num_points is non-zero, then freqs array size must atleast
+ * equal *num_points.
+ */
+static int nvgpu_linux_clk_get_f_points(struct gk20a *g,
+        u32 api_domain, u32 *num_points, u16 *freqs)
+{
+        struct device *dev = dev_from_gk20a(g);
+        struct gk20a_platform *platform = gk20a_get_platform(dev);
+        unsigned long *gpu_freq_table;
+        int ret = 0;
+        int num_supported_freq = 0;
+        u32 i;
+
+        switch (api_domain) {
+        case CTRL_CLK_DOMAIN_GPCCLK:
+                ret = platform->get_clk_freqs(dev, &gpu_freq_table,
+                 &num_supported_freq);
+
+                if (ret) {
+                        return ret;
+                }
+
+                if (num_points == NULL) {
+                        return -EINVAL;
+                }
+
+                if (*num_points != 0U) {
+                        if (freqs == NULL || (*num_points > (u32)num_supported_freq)) {
+                                return -EINVAL;
+                        }
+                }
+
+                if (*num_points == 0) {
+                        *num_points = num_supported_freq;
+                } else {
+                        for (i = 0; i < *num_points; i++) {
+                                freqs[i] = HZ_TO_MHZ(gpu_freq_table[i]);
+                        }
+                }
+                break;
+        default:
+                nvgpu_err(g, "unknown clock: %u", api_domain);
+                ret = -EINVAL;
+                break;
+        }
+
+        return ret;
+}
+
+static int nvgpu_clk_get_range(struct gk20a *g, u32 api_domain,
+                u16 *min_mhz, u16 *max_mhz)
+{
+        struct device *dev = dev_from_gk20a(g);
+        struct gk20a_platform *platform = gk20a_get_platform(dev);
+        unsigned long *freqs;
+        int num_freqs;
+        int ret;
+
+        switch (api_domain) {
+        case CTRL_CLK_DOMAIN_GPCCLK:
+                ret = platform->get_clk_freqs(dev, &freqs, &num_freqs);
+
+                if (!ret) {
+                        *min_mhz = HZ_TO_MHZ(freqs[0]);
+                        *max_mhz = HZ_TO_MHZ(freqs[num_freqs - 1]);
+                }
+                break;
+        default:
+                nvgpu_err(g, "unknown clock: %u", api_domain);
+                ret = -EINVAL;
+                break;
+        }
+
+        return ret;
+}
+
+/* rate_target should be passed in as Hz
+   rounded_rate is returned in Hz */
+static int nvgpu_clk_get_round_rate(struct gk20a *g,
+                u32 api_domain, unsigned long rate_target,
+                unsigned long *rounded_rate)
+{
+        struct device *dev = dev_from_gk20a(g);
+        struct gk20a_platform *platform = gk20a_get_platform(dev);
+        unsigned long *freqs;
+        int num_freqs;
+        int i, ret = 0;
+
+        switch (api_domain) {
+        case CTRL_CLK_DOMAIN_GPCCLK:
+                ret = platform->get_clk_freqs(dev, &freqs, &num_freqs);
+
+                for (i = 0; i < num_freqs; ++i) {
+                        if (freqs[i] >= rate_target) {
+                                *rounded_rate = freqs[i];
+                                return 0;
+                        }
+                }
+                *rounded_rate = freqs[num_freqs - 1];
+                break;
+        default:
+                nvgpu_err(g, "unknown clock: %u", api_domain);
+                ret = -EINVAL;
+                break;
+        }
+
+        return ret;
+}
+
+static int nvgpu_linux_prepare_enable(struct clk_gk20a *clk)
+{
+        return clk_prepare_enable(clk->tegra_clk);
+}
+
+static void nvgpu_linux_disable_unprepare(struct clk_gk20a *clk)
+{
+        clk_disable_unprepare(clk->tegra_clk);
+}
+
+void nvgpu_linux_init_clk_support(struct gk20a *g)
+{
+        g->ops.clk.get_rate = nvgpu_linux_clk_get_rate;
+        g->ops.clk.set_rate = nvgpu_linux_clk_set_rate;
+        g->ops.clk.get_fmax_at_vmin_safe = nvgpu_linux_get_fmax_at_vmin_safe;
+        g->ops.clk.get_ref_clock_rate = nvgpu_linux_get_ref_clock_rate;
+        g->ops.clk.predict_mv_at_hz_cur_tfloor = nvgpu_linux_predict_mv_at_hz_cur_tfloor;
+        g->ops.clk.get_maxrate = nvgpu_linux_get_maxrate;
+        g->ops.clk.prepare_enable = nvgpu_linux_prepare_enable;
+        g->ops.clk.disable_unprepare = nvgpu_linux_disable_unprepare;
+        g->ops.clk.clk_domain_get_f_points = nvgpu_linux_clk_get_f_points;
+        g->ops.clk.get_clk_range = nvgpu_clk_get_range;
+        g->ops.clk.clk_get_round_rate = nvgpu_clk_get_round_rate;
+        g->ops.clk.measure_freq = nvgpu_clk_measure_freq;
+}