gpu: nvgpu: add debugfs to dump clocks

* Removed unused registers from headers
* Added counter based MCLK
* Removed hardcoding

JIRA DNVGPU-98

Change-Id: Idffcd7fc17024582b41c29371a2295df8f0c206b
Signed-off-by: David Nieto <dmartineznie@nvidia.com>
Reviewed-on: http://git-master/r/1204019
(cherry picked from commit 48dfa41a641c3adbc4d25a35f418cf73b08d5e8c)
Reviewed-on: http://git-master/r/1227264
GVS: Gerrit_Virtual_Submit
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>
Tested-by: Terje Bergstrom <tbergstrom@nvidia.com>

1 files changed, 226 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/gp106/clk_gp106.c b/drivers/gpu/nvgpu/gp106/clk_gp106.c
new file mode 100644
index 00000000..4bf03661
--- /dev/null
+++ b/drivers/gpu/nvgpu/gp106/clk_gp106.c
@@ -0,0 +1,226 @@
+/*
+ * GP106 Clocks
+ *
+ * Copyright (c) 2016, 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 <linux/delay.h>        /* for mdelay */
+#include <linux/module.h>
+#include <linux/debugfs.h>
+#include <linux/uaccess.h>
+#include <linux/clk/tegra.h>
+#include <linux/tegra-fuse.h>
+
+#include "gk20a/gk20a.h"
+#include "hw_trim_gp106.h"
+#include "clk_gp106.h"
+
+#define gk20a_dbg_clk(fmt, arg...) \
+        gk20a_dbg(gpu_dbg_clk, fmt, ##arg)
+
+#ifdef CONFIG_DEBUG_FS
+static int clk_gp106_debugfs_init(struct gk20a *g);
+#endif
+
+#define NUM_NAMEMAPS    4
+
+static int gp106_init_clk_support(struct gk20a *g) {
+        struct clk_gk20a *clk = &g->clk;
+        u32 err = 0;
+
+        gk20a_dbg_fn("");
+
+        mutex_init(&clk->clk_mutex);
+
+        clk->clk_namemap = (struct namemap_cfg *)
+                kzalloc(sizeof(struct namemap_cfg) * NUM_NAMEMAPS, GFP_KERNEL);
+
+        if (!clk->clk_namemap)
+                return -ENOMEM;
+
+        clk->clk_namemap[0] = (struct namemap_cfg) {
+                .namemap = CLK_NAMEMAP_INDEX_GPC2CLK,
+                .is_enable = 1,
+                .is_counter = 1,
+                .g = g,
+                .cntr.reg_ctrl_addr = trim_gpc_bcast_clk_cntr_ncgpcclk_cfg_r(),
+                .cntr.reg_ctrl_idx  =
+                        trim_gpc_bcast_clk_cntr_ncgpcclk_cfg_source_gpc2clk_f(),
+                .cntr.reg_cntr_addr = trim_gpc_bcast_clk_cntr_ncgpcclk_cnt_r(),
+                .name = "gpc2clk"
+        };
+        clk->clk_namemap[1] = (struct namemap_cfg) {
+                .namemap = CLK_NAMEMAP_INDEX_SYS2CLK,
+                .is_enable = 1,
+                .is_counter = 1,
+                .g = g,
+                .cntr.reg_ctrl_addr = trim_sys_clk_cntr_ncsyspll_cfg_r(),
+                .cntr.reg_ctrl_idx  = trim_sys_clk_cntr_ncsyspll_cfg_source_sys2clk_f(),
+                .cntr.reg_cntr_addr = trim_sys_clk_cntr_ncsyspll_cnt_r(),
+                .name = "sys2clk"
+        };
+        clk->clk_namemap[2] = (struct namemap_cfg) {
+                .namemap = CLK_NAMEMAP_INDEX_XBAR2CLK,
+                .is_enable = 1,
+                .is_counter = 1,
+                .g = g,
+                .cntr.reg_ctrl_addr = trim_sys_clk_cntr_ncltcpll_cfg_r(),
+                .cntr.reg_ctrl_idx  = trim_sys_clk_cntr_ncltcpll_cfg_source_xbar2clk_f(),
+                .cntr.reg_cntr_addr = trim_sys_clk_cntr_ncltcpll_cnt_r(),
+                .name = "xbar2clk"
+        };
+        clk->clk_namemap[3] = (struct namemap_cfg) {
+                .namemap = CLK_NAMEMAP_INDEX_DRAMCLK,
+                .is_enable = 1,
+                .is_counter = 1,
+                .g = g,
+                .cntr.reg_ctrl_addr = trim_fbpa_bcast_clk_cntr_ncltcclk_cfg_r(),
+                .cntr.reg_ctrl_idx  =
+                        trim_fbpa_bcast_clk_cntr_ncltcclk_cfg_source_dramdiv4_rec_clk1_f(),
+                .cntr.reg_cntr_addr = trim_fbpa_bcast_clk_cntr_ncltcclk_cnt_r(),
+                .name = "dramdiv2_rec_clk1"
+        };
+
+        clk->namemap_num = NUM_NAMEMAPS;
+
+        clk->g = g;
+
+#ifdef CONFIG_DEBUG_FS
+        if (!clk->debugfs_set) {
+                if (!clk_gp106_debugfs_init(g))
+                        clk->debugfs_set = true;
+        }
+#endif
+        return err;
+}
+
+#ifdef CONFIG_DEBUG_FS
+typedef struct namemap_cfg namemap_cfg_t;
+static u32 gp106_get_rate_cntr(struct gk20a *, struct namemap_cfg *);
+
+static u32 gp106_get_rate_cntr(struct gk20a *g, struct namemap_cfg *c) {
+        u32 save_reg;
+        u32 retries;
+        u32 cntr = 0;
+
+        struct clk_gk20a *clk = &g->clk;
+
+        if (!c || !c->cntr.reg_ctrl_addr || !c->cntr.reg_cntr_addr)
+                return 0;
+
+        mutex_lock(&clk->clk_mutex);
+
+        /* Save the register */
+        save_reg = gk20a_readl(g, c->cntr.reg_ctrl_addr);
+
+        /* Disable and reset the current clock */
+        gk20a_writel(g, c->cntr.reg_ctrl_addr,
+                                 trim_gpc_bcast_clk_cntr_ncgpcclk_cfg_reset_asserted_f() |
+                                 trim_gpc_bcast_clk_cntr_ncgpcclk_cfg_enable_deasserted_f());
+
+        /* Force wb() */
+        gk20a_readl(g, c->cntr.reg_ctrl_addr);
+
+        /* Wait for reset to happen */
+        retries = CLK_DEFAULT_CNTRL_SETTLE_RETRIES;
+        do {
+                udelay(CLK_DEFAULT_CNTRL_SETTLE_USECS);
+        } while ((--retries) && (cntr = gk20a_readl(g, c->cntr.reg_cntr_addr)));
+
+        if (!retries) {
+                gk20a_err(dev_from_gk20a(g),
+             "unable to settle counter reset, bailing");
+                goto read_err;
+        }
+        /* Program counter */
+        gk20a_writel(g, c->cntr.reg_ctrl_addr,
+                                        trim_gpc_bcast_clk_cntr_ncgpcclk_cfg_reset_deasserted_f()          |
+                                        trim_gpc_bcast_clk_cntr_ncgpcclk_cfg_enable_asserted_f()           |
+                                        trim_gpc_bcast_clk_cntr_ncgpcclk_cfg_write_en_asserted_f()         |
+                                        trim_gpc_bcast_clk_cntr_ncgpcclk_cfg_write_en_asserted_f()         |
+                                        trim_gpc_bcast_clk_cntr_ncgpcclk_cfg_write_en_asserted_f()         |
+                                        trim_gpc_bcast_clk_cntr_ncgpcclk_cfg_noofipclks_f(XTAL_CNTR_CLKS)  |
+                                        c->cntr.reg_ctrl_idx);
+        gk20a_readl(g, c->cntr.reg_ctrl_addr);
+
+        udelay(XTAL_CNTR_DELAY);
+
+        cntr = XTAL_SCALE_TO_KHZ * gk20a_readl(g, c->cntr.reg_cntr_addr);
+
+read_err:
+        /* reset and restore control register */
+        gk20a_writel(g, c->cntr.reg_ctrl_addr,
+                                 trim_gpc_bcast_clk_cntr_ncgpcclk_cfg_reset_asserted_f() |
+                                 trim_gpc_bcast_clk_cntr_ncgpcclk_cfg_enable_deasserted_f());
+        gk20a_readl(g, c->cntr.reg_ctrl_addr);
+        gk20a_writel(g, c->cntr.reg_ctrl_addr, save_reg);
+        gk20a_readl(g, c->cntr.reg_ctrl_addr);
+        mutex_unlock(&clk->clk_mutex);
+
+        return cntr;
+
+}
+
+static int gp106_get_rate_show(void *data , u64 *val) {
+        struct namemap_cfg *c = (struct namemap_cfg *) data;
+        struct gk20a *g = c->g;
+
+        *val = c->is_counter ? gp106_get_rate_cntr(g, c) : 0 /* TODO PLL read */;
+        return 0;
+}
+DEFINE_SIMPLE_ATTRIBUTE(get_rate_fops, gp106_get_rate_show, NULL, "%llu\n");
+
+
+static int clk_gp106_debugfs_init(struct gk20a *g) {
+        struct gk20a_platform *platform = dev_get_drvdata(g->dev);
+
+        struct dentry *gpu_root = platform->debugfs;
+        struct dentry *clocks_root;
+        struct dentry *d;
+        int i;
+
+        if (NULL == (clocks_root = debugfs_create_dir("clocks", gpu_root)))
+                return -ENOMEM;
+
+        gk20a_dbg(gpu_dbg_info, "g=%p", g);
+
+        for (i = 0; i < g->clk.namemap_num; i++) {
+                if (g->clk.clk_namemap[i].is_enable) {
+                        d = debugfs_create_file(
+                                g->clk.clk_namemap[i].name,
+                                S_IRUGO,
+                                clocks_root,
+                                &g->clk.clk_namemap[i],
+                                &get_rate_fops);
+                        if (!d)
+                                goto err_out;
+                }
+        }
+        return 0;
+
+err_out:
+        pr_err("%s: Failed to make debugfs node\n", __func__);
+        debugfs_remove_recursive(clocks_root);
+        return -ENOMEM;
+}
+
+#endif /* CONFIG_DEBUG_FS */
+
+void gp106_init_clk_ops(struct gpu_ops *gops) {
+        gops->clk.init_clk_support = gp106_init_clk_support;
+}
+
+