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-rw-r--r--drivers/clk/tegra/clk.c370
1 files changed, 370 insertions, 0 deletions
diff --git a/drivers/clk/tegra/clk.c b/drivers/clk/tegra/clk.c
new file mode 100644
index 000000000..ffaf17f71
--- /dev/null
+++ b/drivers/clk/tegra/clk.c
@@ -0,0 +1,370 @@
+/*
+ * Copyright (c) 2012, 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/clkdev.h>
+#include <linux/clk.h>
+#include <linux/clk-provider.h>
+#include <linux/delay.h>
+#include <linux/of.h>
+#include <linux/clk/tegra.h>
+#include <linux/reset-controller.h>
+
+#include <soc/tegra/fuse.h>
+
+#include "clk.h"
+
+#define CLK_OUT_ENB_L 0x010
+#define CLK_OUT_ENB_H 0x014
+#define CLK_OUT_ENB_U 0x018
+#define CLK_OUT_ENB_V 0x360
+#define CLK_OUT_ENB_W 0x364
+#define CLK_OUT_ENB_X 0x280
+#define CLK_OUT_ENB_Y 0x298
+#define CLK_OUT_ENB_SET_L 0x320
+#define CLK_OUT_ENB_CLR_L 0x324
+#define CLK_OUT_ENB_SET_H 0x328
+#define CLK_OUT_ENB_CLR_H 0x32c
+#define CLK_OUT_ENB_SET_U 0x330
+#define CLK_OUT_ENB_CLR_U 0x334
+#define CLK_OUT_ENB_SET_V 0x440
+#define CLK_OUT_ENB_CLR_V 0x444
+#define CLK_OUT_ENB_SET_W 0x448
+#define CLK_OUT_ENB_CLR_W 0x44c
+#define CLK_OUT_ENB_SET_X 0x284
+#define CLK_OUT_ENB_CLR_X 0x288
+#define CLK_OUT_ENB_SET_Y 0x29c
+#define CLK_OUT_ENB_CLR_Y 0x2a0
+
+#define RST_DEVICES_L 0x004
+#define RST_DEVICES_H 0x008
+#define RST_DEVICES_U 0x00C
+#define RST_DEVICES_V 0x358
+#define RST_DEVICES_W 0x35C
+#define RST_DEVICES_X 0x28C
+#define RST_DEVICES_Y 0x2a4
+#define RST_DEVICES_SET_L 0x300
+#define RST_DEVICES_CLR_L 0x304
+#define RST_DEVICES_SET_H 0x308
+#define RST_DEVICES_CLR_H 0x30c
+#define RST_DEVICES_SET_U 0x310
+#define RST_DEVICES_CLR_U 0x314
+#define RST_DEVICES_SET_V 0x430
+#define RST_DEVICES_CLR_V 0x434
+#define RST_DEVICES_SET_W 0x438
+#define RST_DEVICES_CLR_W 0x43c
+#define RST_DEVICES_SET_X 0x290
+#define RST_DEVICES_CLR_X 0x294
+#define RST_DEVICES_SET_Y 0x2a8
+#define RST_DEVICES_CLR_Y 0x2ac
+
+/* Global data of Tegra CPU CAR ops */
+static struct tegra_cpu_car_ops dummy_car_ops;
+struct tegra_cpu_car_ops *tegra_cpu_car_ops = &dummy_car_ops;
+
+int *periph_clk_enb_refcnt;
+static int periph_banks;
+static struct clk **clks;
+static int clk_num;
+static struct clk_onecell_data clk_data;
+
+/* Handlers for SoC-specific reset lines */
+static int (*special_reset_assert)(unsigned long);
+static int (*special_reset_deassert)(unsigned long);
+static unsigned int num_special_reset;
+
+static const struct tegra_clk_periph_regs periph_regs[] = {
+ [0] = {
+ .enb_reg = CLK_OUT_ENB_L,
+ .enb_set_reg = CLK_OUT_ENB_SET_L,
+ .enb_clr_reg = CLK_OUT_ENB_CLR_L,
+ .rst_reg = RST_DEVICES_L,
+ .rst_set_reg = RST_DEVICES_SET_L,
+ .rst_clr_reg = RST_DEVICES_CLR_L,
+ },
+ [1] = {
+ .enb_reg = CLK_OUT_ENB_H,
+ .enb_set_reg = CLK_OUT_ENB_SET_H,
+ .enb_clr_reg = CLK_OUT_ENB_CLR_H,
+ .rst_reg = RST_DEVICES_H,
+ .rst_set_reg = RST_DEVICES_SET_H,
+ .rst_clr_reg = RST_DEVICES_CLR_H,
+ },
+ [2] = {
+ .enb_reg = CLK_OUT_ENB_U,
+ .enb_set_reg = CLK_OUT_ENB_SET_U,
+ .enb_clr_reg = CLK_OUT_ENB_CLR_U,
+ .rst_reg = RST_DEVICES_U,
+ .rst_set_reg = RST_DEVICES_SET_U,
+ .rst_clr_reg = RST_DEVICES_CLR_U,
+ },
+ [3] = {
+ .enb_reg = CLK_OUT_ENB_V,
+ .enb_set_reg = CLK_OUT_ENB_SET_V,
+ .enb_clr_reg = CLK_OUT_ENB_CLR_V,
+ .rst_reg = RST_DEVICES_V,
+ .rst_set_reg = RST_DEVICES_SET_V,
+ .rst_clr_reg = RST_DEVICES_CLR_V,
+ },
+ [4] = {
+ .enb_reg = CLK_OUT_ENB_W,
+ .enb_set_reg = CLK_OUT_ENB_SET_W,
+ .enb_clr_reg = CLK_OUT_ENB_CLR_W,
+ .rst_reg = RST_DEVICES_W,
+ .rst_set_reg = RST_DEVICES_SET_W,
+ .rst_clr_reg = RST_DEVICES_CLR_W,
+ },
+ [5] = {
+ .enb_reg = CLK_OUT_ENB_X,
+ .enb_set_reg = CLK_OUT_ENB_SET_X,
+ .enb_clr_reg = CLK_OUT_ENB_CLR_X,
+ .rst_reg = RST_DEVICES_X,
+ .rst_set_reg = RST_DEVICES_SET_X,
+ .rst_clr_reg = RST_DEVICES_CLR_X,
+ },
+ [6] = {
+ .enb_reg = CLK_OUT_ENB_Y,
+ .enb_set_reg = CLK_OUT_ENB_SET_Y,
+ .enb_clr_reg = CLK_OUT_ENB_CLR_Y,
+ .rst_reg = RST_DEVICES_Y,
+ .rst_set_reg = RST_DEVICES_SET_Y,
+ .rst_clr_reg = RST_DEVICES_CLR_Y,
+ },
+};
+
+static void __iomem *clk_base;
+
+static int tegra_clk_rst_assert(struct reset_controller_dev *rcdev,
+ unsigned long id)
+{
+ /*
+ * If peripheral is on the APB bus then we must read the APB bus to
+ * flush the write operation in apb bus. This will avoid peripheral
+ * access after disabling clock. Since the reset driver has no
+ * knowledge of which reset IDs represent which devices, simply do
+ * this all the time.
+ */
+ tegra_read_chipid();
+
+ if (id < periph_banks * 32) {
+ writel_relaxed(BIT(id % 32),
+ clk_base + periph_regs[id / 32].rst_set_reg);
+ return 0;
+ } else if (id < periph_banks * 32 + num_special_reset) {
+ return special_reset_assert(id);
+ }
+
+ return -EINVAL;
+}
+
+static int tegra_clk_rst_deassert(struct reset_controller_dev *rcdev,
+ unsigned long id)
+{
+ if (id < periph_banks * 32) {
+ writel_relaxed(BIT(id % 32),
+ clk_base + periph_regs[id / 32].rst_clr_reg);
+ return 0;
+ } else if (id < periph_banks * 32 + num_special_reset) {
+ return special_reset_deassert(id);
+ }
+
+ return -EINVAL;
+}
+
+static int tegra_clk_rst_reset(struct reset_controller_dev *rcdev,
+ unsigned long id)
+{
+ int err;
+
+ err = tegra_clk_rst_assert(rcdev, id);
+ if (err)
+ return err;
+
+ udelay(1);
+
+ return tegra_clk_rst_deassert(rcdev, id);
+}
+
+const struct tegra_clk_periph_regs *get_reg_bank(int clkid)
+{
+ int reg_bank = clkid / 32;
+
+ if (reg_bank < periph_banks)
+ return &periph_regs[reg_bank];
+ else {
+ WARN_ON(1);
+ return NULL;
+ }
+}
+
+struct clk ** __init tegra_clk_init(void __iomem *regs, int num, int banks)
+{
+ clk_base = regs;
+
+ if (WARN_ON(banks > ARRAY_SIZE(periph_regs)))
+ return NULL;
+
+ periph_clk_enb_refcnt = kcalloc(32 * banks,
+ sizeof(*periph_clk_enb_refcnt),
+ GFP_KERNEL);
+ if (!periph_clk_enb_refcnt)
+ return NULL;
+
+ periph_banks = banks;
+
+ clks = kcalloc(num, sizeof(struct clk *), GFP_KERNEL);
+ if (!clks)
+ kfree(periph_clk_enb_refcnt);
+
+ clk_num = num;
+
+ return clks;
+}
+
+void __init tegra_init_dup_clks(struct tegra_clk_duplicate *dup_list,
+ struct clk *clks[], int clk_max)
+{
+ struct clk *clk;
+
+ for (; dup_list->clk_id < clk_max; dup_list++) {
+ clk = clks[dup_list->clk_id];
+ dup_list->lookup.clk = clk;
+ clkdev_add(&dup_list->lookup);
+ }
+}
+
+void __init tegra_init_from_table(struct tegra_clk_init_table *tbl,
+ struct clk *clks[], int clk_max)
+{
+ struct clk *clk;
+
+ for (; tbl->clk_id < clk_max; tbl++) {
+ clk = clks[tbl->clk_id];
+ if (IS_ERR_OR_NULL(clk)) {
+ pr_err("%s: invalid entry %ld in clks array for id %d\n",
+ __func__, PTR_ERR(clk), tbl->clk_id);
+ WARN_ON(1);
+
+ continue;
+ }
+
+ if (tbl->parent_id < clk_max) {
+ struct clk *parent = clks[tbl->parent_id];
+ if (clk_set_parent(clk, parent)) {
+ pr_err("%s: Failed to set parent %s of %s\n",
+ __func__, __clk_get_name(parent),
+ __clk_get_name(clk));
+ WARN_ON(1);
+ }
+ }
+
+ if (tbl->rate)
+ if (clk_set_rate(clk, tbl->rate)) {
+ pr_err("%s: Failed to set rate %lu of %s\n",
+ __func__, tbl->rate,
+ __clk_get_name(clk));
+ WARN_ON(1);
+ }
+
+ if (tbl->state)
+ if (clk_prepare_enable(clk)) {
+ pr_err("%s: Failed to enable %s\n", __func__,
+ __clk_get_name(clk));
+ WARN_ON(1);
+ }
+ }
+}
+
+static const struct reset_control_ops rst_ops = {
+ .assert = tegra_clk_rst_assert,
+ .deassert = tegra_clk_rst_deassert,
+ .reset = tegra_clk_rst_reset,
+};
+
+static struct reset_controller_dev rst_ctlr = {
+ .ops = &rst_ops,
+ .owner = THIS_MODULE,
+ .of_reset_n_cells = 1,
+};
+
+void __init tegra_add_of_provider(struct device_node *np,
+ void *clk_src_onecell_get)
+{
+ int i;
+
+ for (i = 0; i < clk_num; i++) {
+ if (IS_ERR(clks[i])) {
+ pr_err
+ ("Tegra clk %d: register failed with %ld\n",
+ i, PTR_ERR(clks[i]));
+ }
+ if (!clks[i])
+ clks[i] = ERR_PTR(-EINVAL);
+ }
+
+ clk_data.clks = clks;
+ clk_data.clk_num = clk_num;
+ of_clk_add_provider(np, clk_src_onecell_get, &clk_data);
+
+ rst_ctlr.of_node = np;
+ rst_ctlr.nr_resets = periph_banks * 32 + num_special_reset;
+ reset_controller_register(&rst_ctlr);
+}
+
+void __init tegra_init_special_resets(unsigned int num,
+ int (*assert)(unsigned long),
+ int (*deassert)(unsigned long))
+{
+ num_special_reset = num;
+ special_reset_assert = assert;
+ special_reset_deassert = deassert;
+}
+
+void __init tegra_register_devclks(struct tegra_devclk *dev_clks, int num)
+{
+ int i;
+
+ for (i = 0; i < num; i++, dev_clks++)
+ clk_register_clkdev(clks[dev_clks->dt_id], dev_clks->con_id,
+ dev_clks->dev_id);
+
+ for (i = 0; i < clk_num; i++) {
+ if (!IS_ERR_OR_NULL(clks[i]))
+ clk_register_clkdev(clks[i], __clk_get_name(clks[i]),
+ "tegra-clk-debug");
+ }
+}
+
+struct clk ** __init tegra_lookup_dt_id(int clk_id,
+ struct tegra_clk *tegra_clk)
+{
+ if (tegra_clk[clk_id].present)
+ return &clks[tegra_clk[clk_id].dt_id];
+ else
+ return NULL;
+}
+
+tegra_clk_apply_init_table_func tegra_clk_apply_init_table;
+
+static int __init tegra_clocks_apply_init_table(void)
+{
+ if (!tegra_clk_apply_init_table)
+ return 0;
+
+ tegra_clk_apply_init_table();
+
+ return 0;
+}
+arch_initcall(tegra_clocks_apply_init_table);
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-30 07:49:28 +0000