gpu: nvgpu: move clk_gm20b debugfs to Linux module

Move debugfs code from clk_gm20b.c to file in Linux module
common/linux/debug_clk.c
This file will be compiled only if CONFIG_DEBUG_FS is set

Define below new HAL APIs for various clock operations
which can be accessed from debug file
init_debugfs()
get_voltage()
get_gpcclk_clock_counter()
pll_reg_write()
get_pll_debug_data()

Export nvgpu_pl_to_div() and nvgpu_div_to_pl() so
that these can be accessed from debug_clk.c

Add new structure nvgpu_clk_pll_debug_data so that
all required register values for debugging can be
made available in debug_clk.c

Add new API gm20b_get_gpc_pll_parms() so that statically
defined variable can be accessed in debug_clk.c too

Remove global variable dvfs_safe_max_freq and add
it to struct clk_gk20a so that it can accessed
from both clk_gm20b.c and debug_clk.c

Jira NVGPU-62

Change-Id: I3ae70b40235e78141a686686930e1f178ad59453
Signed-off-by: Deepak Nibade <dnibade@nvidia.com>
Reviewed-on: http://git-master/r/1488903
GVS: Gerrit_Virtual_Submit
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>

1 files changed, 271 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/common/linux/debug_clk.c b/drivers/gpu/nvgpu/common/linux/debug_clk.c
new file mode 100644
index 00000000..9dfa2d77
--- /dev/null
+++ b/drivers/gpu/nvgpu/common/linux/debug_clk.c
@@ -0,0 +1,271 @@
+/*
+ * Copyright (C) 2017 NVIDIA Corporation.  All rights reserved.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that 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.
+ *
+ */
+
+#include <linux/uaccess.h>
+#include <linux/debugfs.h>
+#include <linux/seq_file.h>
+
+#include "gk20a/platform_gk20a.h"
+#include "gm20b/clk_gm20b.h"
+
+static int rate_get(void *data, u64 *val)
+{
+        struct gk20a *g = (struct gk20a *)data;
+        struct clk_gk20a *clk = &g->clk;
+
+        *val = (u64)rate_gpc2clk_to_gpu(clk->gpc_pll.freq);
+        return 0;
+}
+static int rate_set(void *data, u64 val)
+{
+        struct gk20a *g = (struct gk20a *)data;
+        return g->ops.clk.set_rate(g, CTRL_CLK_DOMAIN_GPCCLK, (u32)val);
+}
+DEFINE_SIMPLE_ATTRIBUTE(rate_fops, rate_get, rate_set, "%llu\n");
+
+static int pll_reg_show(struct seq_file *s, void *data)
+{
+        struct gk20a *g = s->private;
+        struct nvgpu_clk_pll_debug_data d;
+        u32 reg, m, n, pl, f;
+        int err = 0;
+
+        if (g->ops.clk.get_pll_debug_data) {
+                err = g->ops.clk.get_pll_debug_data(g, &d);
+                if (err)
+                        return err;
+        } else {
+                return -EINVAL;
+        }
+
+        seq_printf(s, "bypassctrl = %s, ",
+                        d.trim_sys_bypassctrl_val ? "bypass" : "vco");
+        seq_printf(s, "sel_vco = %s, ",
+                        d.trim_sys_sel_vco_val ? "vco" : "bypass");
+
+        seq_printf(s, "cfg  = 0x%x : %s : %s : %s\n", d.trim_sys_gpcpll_cfg_val,
+                d.trim_sys_gpcpll_cfg_enabled ? "enabled" : "disabled",
+                d.trim_sys_gpcpll_cfg_locked ? "locked" : "unlocked",
+                d.trim_sys_gpcpll_cfg_sync_on ? "sync_on" : "sync_off");
+
+        reg = d.trim_sys_gpcpll_coeff_val;
+        m = d.trim_sys_gpcpll_coeff_mdiv;
+        n = d.trim_sys_gpcpll_coeff_ndiv;
+        pl = d.trim_sys_gpcpll_coeff_pldiv;
+        f = g->clk.gpc_pll.clk_in * n / (m * nvgpu_pl_to_div(pl));
+        seq_printf(s, "coef = 0x%x : m = %u : n = %u : pl = %u", reg, m, n, pl);
+        seq_printf(s, " : pll_f(gpu_f) = %u(%u) kHz\n", f, f/2);
+
+        seq_printf(s, "dvfs0 = 0x%x : d = %u : dmax = %u : doffs = %u\n",
+                d.trim_sys_gpcpll_dvfs0_val,
+                d.trim_sys_gpcpll_dvfs0_dfs_coeff,
+                d.trim_sys_gpcpll_dvfs0_dfs_det_max,
+                d.trim_sys_gpcpll_dvfs0_dfs_dc_offset);
+
+        return 0;
+}
+
+static int pll_reg_open(struct inode *inode, struct file *file)
+{
+        return single_open(file, pll_reg_show, inode->i_private);
+}
+
+static const struct file_operations pll_reg_fops = {
+        .open           = pll_reg_open,
+        .read           = seq_read,
+        .llseek         = seq_lseek,
+        .release        = single_release,
+};
+
+static int pll_reg_raw_show(struct seq_file *s, void *data)
+{
+        struct gk20a *g = s->private;
+        struct nvgpu_clk_pll_debug_data d;
+        u32 reg;
+        int err = 0;
+
+        if (g->ops.clk.get_pll_debug_data) {
+                err = g->ops.clk.get_pll_debug_data(g, &d);
+                if (err)
+                        return err;
+        } else {
+                return -EINVAL;
+        }
+
+        seq_puts(s, "GPCPLL REGISTERS:\n");
+        for (reg = d.trim_sys_gpcpll_cfg_reg;
+             reg <= d.trim_sys_gpcpll_dvfs2_reg;
+             reg += sizeof(u32))
+                seq_printf(s, "[0x%02x] = 0x%08x\n", reg, gk20a_readl(g, reg));
+
+        seq_puts(s, "\nGPC CLK OUT REGISTERS:\n");
+
+        seq_printf(s, "[0x%02x] = 0x%08x\n", d.trim_sys_sel_vco_reg,
+                                             d.trim_sys_sel_vco_val);
+        seq_printf(s, "[0x%02x] = 0x%08x\n", d.trim_sys_gpc2clk_out_reg,
+                                             d.trim_sys_gpc2clk_out_val);
+        seq_printf(s, "[0x%02x] = 0x%08x\n", d.trim_sys_bypassctrl_reg,
+                                             d.trim_sys_bypassctrl_val);
+
+        return 0;
+}
+
+static int pll_reg_raw_open(struct inode *inode, struct file *file)
+{
+        return single_open(file, pll_reg_raw_show, inode->i_private);
+}
+
+static ssize_t pll_reg_raw_write(struct file *file,
+        const char __user *userbuf, size_t count, loff_t *ppos)
+{
+        struct gk20a *g = file->f_path.dentry->d_inode->i_private;
+        char buf[80];
+        u32 reg, val;
+        int err = 0;
+
+        if (sizeof(buf) <= count)
+                return -EINVAL;
+
+        if (copy_from_user(buf, userbuf, count))
+                return -EFAULT;
+
+        /* terminate buffer and trim - white spaces may be appended
+         *  at the end when invoked from shell command line */
+        buf[count] = '\0';
+        strim(buf);
+
+        if (sscanf(buf, "[0x%x] = 0x%x", &reg, &val) != 2)
+                return -EINVAL;
+
+        if (g->ops.clk.pll_reg_write(g, reg, val))
+                err = g->ops.clk.pll_reg_write(g, reg, val);
+        else
+                err = -EINVAL;
+
+        return err;
+}
+
+static const struct file_operations pll_reg_raw_fops = {
+        .open           = pll_reg_raw_open,
+        .read           = seq_read,
+        .write          = pll_reg_raw_write,
+        .llseek         = seq_lseek,
+        .release        = single_release,
+};
+
+static int monitor_get(void *data, u64 *val)
+{
+        struct gk20a *g = (struct gk20a *)data;
+        int err = 0;
+
+        if (g->ops.clk.get_gpcclk_clock_counter)
+                err = g->ops.clk.get_gpcclk_clock_counter(&g->clk, val);
+        else
+                err = -EINVAL;
+
+        return err;
+}
+DEFINE_SIMPLE_ATTRIBUTE(monitor_fops, monitor_get, NULL, "%llu\n");
+
+static int voltage_get(void *data, u64 *val)
+{
+        struct gk20a *g = (struct gk20a *)data;
+        int err = 0;
+
+        if (g->ops.clk.get_voltage)
+                err = g->ops.clk.get_voltage(&g->clk, val);
+        else
+                err = -EINVAL;
+
+        return err;
+}
+DEFINE_SIMPLE_ATTRIBUTE(voltage_fops, voltage_get, NULL, "%llu\n");
+
+static int pll_param_show(struct seq_file *s, void *data)
+{
+        struct pll_parms *gpc_pll_params = gm20b_get_gpc_pll_parms();
+
+        seq_printf(s, "ADC offs = %d uV, ADC slope = %d uV, VCO ctrl = 0x%x\n",
+                   gpc_pll_params->uvdet_offs, gpc_pll_params->uvdet_slope,
+                   gpc_pll_params->vco_ctrl);
+        return 0;
+}
+
+static int pll_param_open(struct inode *inode, struct file *file)
+{
+        return single_open(file, pll_param_show, inode->i_private);
+}
+
+static const struct file_operations pll_param_fops = {
+        .open           = pll_param_open,
+        .read           = seq_read,
+        .llseek         = seq_lseek,
+        .release        = single_release,
+};
+
+int gm20b_clk_init_debugfs(struct gk20a *g)
+{
+        struct dentry *d;
+        struct gk20a_platform *platform = dev_get_drvdata(g->dev);
+
+        if (!platform->debugfs)
+                return -EINVAL;
+
+        d = debugfs_create_file(
+                "rate", S_IRUGO|S_IWUSR, platform->debugfs, g, &rate_fops);
+        if (!d)
+                goto err_out;
+
+        d = debugfs_create_file(
+                "pll_reg", S_IRUGO, platform->debugfs, g, &pll_reg_fops);
+        if (!d)
+                goto err_out;
+
+        d = debugfs_create_file("pll_reg_raw",
+                S_IRUGO, platform->debugfs, g, &pll_reg_raw_fops);
+        if (!d)
+                goto err_out;
+
+        d = debugfs_create_file(
+                "monitor", S_IRUGO, platform->debugfs, g, &monitor_fops);
+        if (!d)
+                goto err_out;
+
+        d = debugfs_create_file(
+                "voltage", S_IRUGO, platform->debugfs, g, &voltage_fops);
+        if (!d)
+                goto err_out;
+
+        d = debugfs_create_file(
+                "pll_param", S_IRUGO, platform->debugfs, g, &pll_param_fops);
+        if (!d)
+                goto err_out;
+
+        d = debugfs_create_u32("pll_na_mode", S_IRUGO, platform->debugfs,
+                               (u32 *)&g->clk.gpc_pll.mode);
+        if (!d)
+                goto err_out;
+
+        d = debugfs_create_u32("fmax2x_at_vmin_safe_t", S_IRUGO,
+                       platform->debugfs, (u32 *)&g->clk.dvfs_safe_max_freq);
+        if (!d)
+                goto err_out;
+
+        return 0;
+
+err_out:
+        pr_err("%s: Failed to make debugfs node\n", __func__);
+        debugfs_remove_recursive(platform->debugfs);
+        return -ENOMEM;
+}