[PATCH v2 7/9] clk: msm: Add support for MSM8960's global clock controller (GCC)

Stephen Boyd
2013-10-02T19:09:56Z

Add a driver for the global clock controller found on MSM8960
based platforms. This should allow most non-multimedia device
drivers to probe and control their clocks.

TODO: Fill out reset of data and define all clocks

Cc: <devicetree@vger.kernel.org>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
---
.../devicetree/bindings/clock/qcom,gcc.txt | 19 +
drivers/clk/msm/Kconfig | 7 +
drivers/clk/msm/Makefile | 2 +
drivers/clk/msm/gcc-8960.c | 381 +++++++++++++++++++++
include/dt-bindings/clk/msm-gcc-8960.h | 28 ++
5 files changed, 437 insertions(+)
create mode 100644 Documentation/devicetree/bindings/clock/qcom,gcc.txt
create mode 100644 drivers/clk/msm/gcc-8960.c
create mode 100644 include/dt-bindings/clk/msm-gcc-8960.h

diff --git a/Documentation/devicetree/bindings/clock/qcom,gcc.txt b/Documentation/devicetree/bindings/clock/qcom,gcc.txt
new file mode 100644
index 0000000..e31423a
--- /dev/null
+++ b/Documentation/devicetree/bindings/clock/qcom,gcc.txt
@@ -0,0 +1,19 @@
+MSM Global Clock Controller Binding
+-----------------------------------
+
+Required properties :
+- compatible : shall contain at least "qcom,gcc" and only one of the
+ following:
+
+ "qcom,gcc-8660"
+ "qcom,gcc-8960"
+
+- reg : shall contain base register location and length
+- #clock-cells : shall contain 1
+
+Example:
+ clock-controller@900000 {
+ compatible = "qcom,gcc-8960", "qcom,gcc";
+ reg = <0x900000 0x4000>;
+ #clock-cells = <1>;
+ };
diff --git a/drivers/clk/msm/Kconfig b/drivers/clk/msm/Kconfig
index 91558ce..241fafc 100644
--- a/drivers/clk/msm/Kconfig
+++ b/drivers/clk/msm/Kconfig
@@ -3,3 +3,10 @@ config COMMON_CLK_MSM
depends on OF
select REGMAP_MMIO

+config MSM_GCC_8960
+ tristate "MSM8960 Global Clock Controller"
+ depends on COMMON_CLK_MSM
+ help
+ Support for the global clock controller on msm8960 devices.
+ Say Y if you want to use peripheral devices such as UART, SPI,
+ i2c, USB, SD/eMMC, SATA, PCIe, etc.
diff --git a/drivers/clk/msm/Makefile b/drivers/clk/msm/Makefile
index e1cee29..804fbe1 100644
--- a/drivers/clk/msm/Makefile
+++ b/drivers/clk/msm/Makefile
@@ -4,3 +4,5 @@ clk-msm-$(CONFIG_COMMON_CLK_MSM) += clk-pll.o
clk-msm-$(CONFIG_COMMON_CLK_MSM) += clk-rcg.o
clk-msm-$(CONFIG_COMMON_CLK_MSM) += clk-rcg2.o
clk-msm-$(CONFIG_COMMON_CLK_MSM) += clk-branch.o
+
+obj-$(CONFIG_MSM_GCC_8960) += gcc-8960.o
diff --git a/drivers/clk/msm/gcc-8960.c b/drivers/clk/msm/gcc-8960.c
new file mode 100644
index 0000000..41c8a2f
--- /dev/null
+++ b/drivers/clk/msm/gcc-8960.c
@@ -0,0 +1,381 @@
+/*
+ * Copyright (c) 2013, The Linux Foundation. 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/bitops.h>
+#include <linux/err.h>
+#include <linux/platform_device.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/clk-provider.h>
+#include <linux/regmap.h>
+
+#include <dt-bindings/clk/msm-gcc-8960.h>
+
+#include "clk-pll.h"
+#include "clk-rcg.h"
+#include "clk-branch.h"
+
+static struct clk_pll pll8 = {
+ .l_reg = 0x3144,
+ .m_reg = 0x3148,
+ .n_reg = 0x314c,
+ .config_reg = 0x3154,
+ .mode_reg = 0x3140,
+ .status_reg = 0x3158,
+ .status_bit = 16,
+ .hw.init = &(struct clk_init_data){
+ .name = "pll8",
+ .parent_names = (const char *[]){ "pxo" },
+ .num_parents = 1,
+ .ops = &clk_pll_ops,
+ },
+};
+
+static struct clk_hw pll8_vote = {
+ .enable_reg = 0x34c0,
+ .enable_mask = BIT(8),
+ .init = &(struct clk_init_data){
+ .name = "pll8_vote",
+ .parent_names = (const char *[]){ "pll8" },
+ .num_parents = 1,
+ .ops = &clk_pll_vote_ops,
+ },
+};
+
+#define P_PXO 0
+#define P_PLL8 1
+
+static u8 gcc_pxo_pll8_map[] = {
+ [P_PXO] = 0,
+ [P_PLL8] = 3,
+};
+
+static struct freq_tbl clk_tbl_gsbi_uart[] = {
+ { 1843200, P_PLL8, 2, 6, 625 },
+ { 3686400, P_PLL8, 2, 12, 625 },
+ { 7372800, P_PLL8, 2, 24, 625 },
+ { 14745600, P_PLL8, 2, 48, 625 },
+ { 16000000, P_PLL8, 4, 1, 6 },
+ { 24000000, P_PLL8, 4, 1, 4 },
+ { 32000000, P_PLL8, 4, 1, 3 },
+ { 40000000, P_PLL8, 1, 5, 48 },
+ { 46400000, P_PLL8, 1, 29, 240 },
+ { 48000000, P_PLL8, 4, 1, 2 },
+ { 51200000, P_PLL8, 1, 2, 15 },
+ { 56000000, P_PLL8, 1, 7, 48 },
+ { 58982400, P_PLL8, 1, 96, 625 },
+ { 64000000, P_PLL8, 2, 1, 3 },
+ { }
+};
+
+static struct clk_rcg gsbi5_uart_rcg = {
+ .ns_reg = 0x2a54,
+ .md_reg = 0x2a50,
+ .mn = {
+ .mnctr_en_bit = 8,
+ .mnctr_reset_bit = 7,
+ .mnctr_mode_shift = 5,
+ .n_val_shift = 16,
+ .m_val_shift = 16,
+ .width = 16,
+ },
+ .p = {
+ .pre_div_shift = 3,
+ .pre_div_width = 2,
+ },
+ .s = {
+ .src_sel_shift = 0,
+ .parent_map = gcc_pxo_pll8_map,
+ },
+ .freq_tbl = clk_tbl_gsbi_uart,
+ .hw = {
+ .enable_reg = 0x2a54,
+ .enable_mask = BIT(11),
+ .init = &(struct clk_init_data){
+ .name = "gsbi5_uart_rcg",
+ .parent_names = (const char *[]){
+ "pxo",
+ "pll8_vote",
+ },
+ .num_parents = 2,
+ .ops = &clk_rcg_ops,
+ },
+ },
+};
+
+static struct clk_branch gsbi5_uart_cxc = {
+ .halt_reg = 0x2fd0,
+ .halt_bit = 22,
+ .hw = {
+ .enable_reg = 0x2a54,
+ .enable_mask = BIT(9),
+ .init = &(struct clk_init_data){
+ .name = "gsbi5_uart_cxc",
+ .parent_names = (const char *[]){
+ "gsbi5_uart_rcg",
+ },
+ .num_parents = 1,
+ .ops = &clk_branch_ops,
+ },
+ },
+};
+
+static struct clk_rcg gsbi6_uart_rcg = {
+ .ns_reg = 0x2a74,
+ .md_reg = 0x2a70,
+ .mn = {
+ .mnctr_en_bit = 8,
+ .mnctr_reset_bit = 7,
+ .mnctr_mode_shift = 5,
+ .n_val_shift = 16,
+ .m_val_shift = 16,
+ .width = 16,
+ },
+ .p = {
+ .pre_div_shift = 3,
+ .pre_div_width = 2,
+ },
+ .s = {
+ .src_sel_shift = 0,
+ .parent_map = gcc_pxo_pll8_map,
+ },
+ .freq_tbl = clk_tbl_gsbi_uart,
+ .hw = {
+ .enable_reg = 0x2a74,
+ .enable_mask = BIT(11),
+ .init = &(struct clk_init_data){
+ .name = "gsbi6_uart_rcg",
+ .parent_names = (const char *[]){
+ "pxo",
+ "pll8_vote",
+ },
+ .num_parents = 2,
+ .ops = &clk_rcg_ops,
+ },
+ },
+};
+
+static struct clk_branch gsbi6_uart_cxc = {
+ .halt_reg = 0x2fd0,
+ .halt_bit = 18,
+ .hw = {
+ .enable_reg = 0x2a74,
+ .enable_mask = BIT(9),
+ .init = &(struct clk_init_data){
+ .name = "gsbi6_uart_cxc",
+ .parent_names = (const char *[]){
+ "gsbi6_uart_rcg",
+ },
+ .num_parents = 1,
+ .ops = &clk_branch_ops,
+ },
+ },
+};
+
+static struct clk_branch gsbi5_uart_ahb = {
+ .halt_reg = 0x2fd0,
+ .halt_bit = 23,
+ .hwcg_reg = 0x2a40,
+ .hwcg_bit = 6,
+ .hw = {
+ .enable_reg = 0x2a40,
+ .enable_mask = BIT(4),
+ .init = &(struct clk_init_data){
+ .name = "gsbi5_uart_ahb",
+ .ops = &clk_branch_ops,
+ },
+ },
+};
+
+static struct freq_tbl clk_tbl_gsbi_qup[] = {
+ { 1100000, P_PXO, 1, 2, 49 },
+ { 5400000, P_PXO, 1, 1, 5 },
+ { 10800000, P_PXO, 1, 2, 5 },
+ { 15060000, P_PLL8, 1, 2, 51 },
+ { 24000000, P_PLL8, 4, 1, 4 },
+ { 25600000, P_PLL8, 1, 1, 15 },
+ { 27000000, P_PXO, 1, 0, 0 },
+ { 48000000, P_PLL8, 4, 1, 2 },
+ { 51200000, P_PLL8, 1, 2, 15 },
+ { }
+};
+
+static struct clk_rcg gsbi5_qup_rcg = {
+ .ns_reg = 0x2a4c,
+ .md_reg = 0x2a48,
+ .mn = {
+ .mnctr_en_bit = 8,
+ .mnctr_reset_bit = 7,
+ .mnctr_mode_shift = 5,
+ .n_val_shift = 16,
+ .m_val_shift = 16,
+ .width = 16,
+ },
+ .p = {
+ .pre_div_shift = 3,
+ .pre_div_width = 2,
+ },
+ .s = {
+ .src_sel_shift = 0,
+ .parent_map = gcc_pxo_pll8_map,
+ },
+ .freq_tbl = clk_tbl_gsbi_qup,
+ .hw = {
+ .enable_reg = 0x2a4c,
+ .enable_mask = BIT(11),
+ .init = &(struct clk_init_data){
+ .name = "gsbi5_qup_rcg",
+ .parent_names = (const char *[]){
+ "pxo",
+ "pll8_vote",
+ },
+ .num_parents = 2,
+ .ops = &clk_rcg_ops,
+ },
+ },
+};
+
+static struct clk_branch gsbi5_qup_cxc = {
+ .halt_reg = 0x2fd0,
+ .halt_bit = 20,
+ .hw = {
+ .enable_reg = 0x2a4c,
+ .enable_mask = BIT(9),
+ .init = &(struct clk_init_data){
+ .name = "gsbi5_qup_cxc",
+ .parent_names = (const char *[]){
+ "gsbi5_qup_rcg",
+ },
+ .num_parents = 1,
+ .ops = &clk_branch_ops,
+ },
+ },
+};
+
+struct clk_map {
+ unsigned long id;
+ struct clk_hw *hw;
+};
+
+#define MAP(i, h) [i] = { .id = i, .hw = h }
+
+static const struct clk_map map[] = {
+ MAP(PLL8, &pll8.hw),
+ MAP(PLL8_VOTE, &pll8_vote),
+ MAP(GSBI5_UART_RCG, &gsbi5_uart_rcg.hw),
+ MAP(GSBI5_UART_CXC, &gsbi5_uart_cxc.hw),
+ MAP(GSBI6_UART_RCG, &gsbi6_uart_rcg.hw),
+ MAP(GSBI6_UART_CXC, &gsbi6_uart_cxc.hw),
+ MAP(GSBI5_UART_AHB, &gsbi5_uart_ahb.hw),
+ MAP(GSBI5_QUP_RCG, &gsbi5_qup_rcg.hw),
+ MAP(GSBI5_QUP_CXC, &gsbi5_qup_cxc.hw),
+};
+
+static const struct regmap_config msm_gcc_8960_regmap_config = {
+ .reg_bits = 32,
+ .reg_stride = 4,
+ .val_bits = 32,
+ .max_register = 0x3660,
+ .fast_io = true,
+};
+
+static const struct of_device_id msm_gcc_8960_match_table[] = {
+ { .compatible = "qcom,gcc-8960" },
+ { }
+};
+MODULE_DEVICE_TABLE(of, msm_gcc_8960_match_table);
+
+static int msm_gcc_8960_probe(struct platform_device *pdev)
+{
+ void __iomem *base;
+ struct resource *res;
+ int i;
+ struct device *dev = &pdev->dev;
+ struct clk *clk;
+ struct clk_onecell_data *data;
+ struct clk **clks;
+ struct regmap *regmap;
+ size_t num_clks;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ base = devm_ioremap_resource(dev, res);
+ if (IS_ERR(base))
+ return PTR_ERR(base);
+
+ regmap = devm_regmap_init_mmio(dev, base, &msm_gcc_8960_regmap_config);
+ if (IS_ERR(regmap))
+ return PTR_ERR(regmap);
+
+ num_clks = ARRAY_SIZE(map);
+ data = devm_kzalloc(dev, sizeof(*data) + sizeof(*clks) * num_clks,
+ GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ clks = (struct clk **)(data + 1);
+ data->clks = clks;
+ data->clk_num = num_clks;
+
+ /* Temporary until RPM clocks supported */
+ clk = clk_register_fixed_rate(dev, "cxo", NULL, CLK_IS_ROOT, 19200000);
+ if (IS_ERR(clk))
+ return PTR_ERR(clk);
+
+ clk = clk_register_fixed_rate(dev, "pxo", NULL, CLK_IS_ROOT, 27000000);
+ if (IS_ERR(clk))
+ return PTR_ERR(clk);
+
+ for (i = 0; i < num_clks; i++) {
+ if (!map[i].hw)
+ continue;
+ clk = devm_clk_register(dev, map[i].hw);
+ if (IS_ERR(clk))
+ return PTR_ERR(clk);
+ clks[map[i].id] = clk;
+ }
+
+ return of_clk_add_provider(dev->of_node, of_clk_src_onecell_get, data);
+}
+
+static int msm_gcc_8960_remove(struct platform_device *pdev)
+{
+ of_clk_del_provider(pdev->dev.of_node);
+ return 0;
+}
+
+static struct platform_driver msm_gcc_8960_driver = {
+ .probe = msm_gcc_8960_probe,
+ .remove = msm_gcc_8960_remove,
+ .driver = {
+ .name = "msm-gcc-8960",
+ .owner = THIS_MODULE,
+ .of_match_table = msm_gcc_8960_match_table,
+ },
+};
+
+static int __init msm_gcc_8960_init(void)
+{
+ return platform_driver_register(&msm_gcc_8960_driver);
+}
+core_initcall(msm_gcc_8960_init);
+
+static void __exit msm_gcc_8960_exit(void)
+{
+ platform_driver_unregister(&msm_gcc_8960_driver);
+}
+module_exit(msm_gcc_8960_exit);
+
+MODULE_DESCRIPTION("MSM GCC 8960 Driver");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:msm-gcc-8960");
diff --git a/include/dt-bindings/clk/msm-gcc-8960.h b/include/dt-bindings/clk/msm-gcc-8960.h
new file mode 100644
index 0000000..685b118
--- /dev/null
+++ b/include/dt-bindings/clk/msm-gcc-8960.h
@@ -0,0 +1,28 @@
+/*
+ * Copyright (c) 2013, The Linux Foundation. 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.
+ */
+
+#ifndef _DT_BINDINGS_CLK_MSM_GCC_8960_H
+#define _DT_BINDINGS_CLK_MSM_GCC_8960_H
+
+#define PLL8 0
+#define PLL8_VOTE 1
+#define GSBI5_UART_RCG 2
+#define GSBI5_UART_CXC 3
+#define GSBI6_UART_RCG 4
+#define GSBI6_UART_CXC 5
+#define GSBI6_UART_AHB 6
+#define GSBI5_UART_AHB 7
+#define GSBI5_QUP_RCG 8
+#define GSBI5_QUP_CXC 9