summaryrefslogtreecommitdiffstats
path: root/drivers/clk/qcom/a53-pll.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/clk/qcom/a53-pll.c')
-rw-r--r--drivers/clk/qcom/a53-pll.c170
1 files changed, 170 insertions, 0 deletions
diff --git a/drivers/clk/qcom/a53-pll.c b/drivers/clk/qcom/a53-pll.c
new file mode 100644
index 0000000000..f9c5e296db
--- /dev/null
+++ b/drivers/clk/qcom/a53-pll.c
@@ -0,0 +1,170 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Qualcomm A53 PLL driver
+ *
+ * Copyright (c) 2017, Linaro Limited
+ * Author: Georgi Djakov <georgi.djakov@linaro.org>
+ */
+
+#include <linux/clk.h>
+#include <linux/clk-provider.h>
+#include <linux/kernel.h>
+#include <linux/platform_device.h>
+#include <linux/pm_opp.h>
+#include <linux/regmap.h>
+#include <linux/module.h>
+
+#include "clk-pll.h"
+#include "clk-regmap.h"
+
+static const struct pll_freq_tbl a53pll_freq[] = {
+ { 998400000, 52, 0x0, 0x1, 0 },
+ { 1094400000, 57, 0x0, 0x1, 0 },
+ { 1152000000, 62, 0x0, 0x1, 0 },
+ { 1209600000, 63, 0x0, 0x1, 0 },
+ { 1248000000, 65, 0x0, 0x1, 0 },
+ { 1363200000, 71, 0x0, 0x1, 0 },
+ { 1401600000, 73, 0x0, 0x1, 0 },
+ { }
+};
+
+static const struct regmap_config a53pll_regmap_config = {
+ .reg_bits = 32,
+ .reg_stride = 4,
+ .val_bits = 32,
+ .max_register = 0x40,
+ .fast_io = true,
+};
+
+static struct pll_freq_tbl *qcom_a53pll_get_freq_tbl(struct device *dev)
+{
+ struct pll_freq_tbl *freq_tbl;
+ unsigned long xo_freq;
+ unsigned long freq;
+ struct clk *xo_clk;
+ int count;
+ int ret;
+ int i;
+
+ xo_clk = devm_clk_get(dev, "xo");
+ if (IS_ERR(xo_clk))
+ return NULL;
+
+ xo_freq = clk_get_rate(xo_clk);
+
+ ret = devm_pm_opp_of_add_table(dev);
+ if (ret)
+ return NULL;
+
+ count = dev_pm_opp_get_opp_count(dev);
+ if (count <= 0)
+ return NULL;
+
+ freq_tbl = devm_kcalloc(dev, count + 1, sizeof(*freq_tbl), GFP_KERNEL);
+ if (!freq_tbl)
+ return NULL;
+
+ for (i = 0, freq = 0; i < count; i++, freq++) {
+ struct dev_pm_opp *opp;
+
+ opp = dev_pm_opp_find_freq_ceil(dev, &freq);
+ if (IS_ERR(opp))
+ return NULL;
+
+ /* Skip the freq that is not divisible */
+ if (freq % xo_freq)
+ continue;
+
+ freq_tbl[i].freq = freq;
+ freq_tbl[i].l = freq / xo_freq;
+ freq_tbl[i].n = 1;
+
+ dev_pm_opp_put(opp);
+ }
+
+ return freq_tbl;
+}
+
+static int qcom_a53pll_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct device_node *np = dev->of_node;
+ struct regmap *regmap;
+ struct clk_pll *pll;
+ void __iomem *base;
+ struct clk_init_data init = { };
+ int ret;
+
+ pll = devm_kzalloc(dev, sizeof(*pll), GFP_KERNEL);
+ if (!pll)
+ return -ENOMEM;
+
+ base = devm_platform_ioremap_resource(pdev, 0);
+ if (IS_ERR(base))
+ return PTR_ERR(base);
+
+ regmap = devm_regmap_init_mmio(dev, base, &a53pll_regmap_config);
+ if (IS_ERR(regmap))
+ return PTR_ERR(regmap);
+
+ pll->l_reg = 0x04;
+ pll->m_reg = 0x08;
+ pll->n_reg = 0x0c;
+ pll->config_reg = 0x14;
+ pll->mode_reg = 0x00;
+ pll->status_reg = 0x1c;
+ pll->status_bit = 16;
+
+ pll->freq_tbl = qcom_a53pll_get_freq_tbl(dev);
+ if (!pll->freq_tbl) {
+ /* Fall on a53pll_freq if no freq_tbl is found from OPP */
+ pll->freq_tbl = a53pll_freq;
+ }
+
+ /* Use an unique name by appending @unit-address */
+ init.name = devm_kasprintf(dev, GFP_KERNEL, "a53pll%s",
+ strchrnul(np->full_name, '@'));
+ if (!init.name)
+ return -ENOMEM;
+
+ init.parent_data = &(const struct clk_parent_data){
+ .fw_name = "xo", .name = "xo_board",
+ };
+ init.num_parents = 1;
+ init.ops = &clk_pll_sr2_ops;
+ pll->clkr.hw.init = &init;
+
+ ret = devm_clk_register_regmap(dev, &pll->clkr);
+ if (ret) {
+ dev_err(dev, "failed to register regmap clock: %d\n", ret);
+ return ret;
+ }
+
+ ret = devm_of_clk_add_hw_provider(dev, of_clk_hw_simple_get,
+ &pll->clkr.hw);
+ if (ret) {
+ dev_err(dev, "failed to add clock provider: %d\n", ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+static const struct of_device_id qcom_a53pll_match_table[] = {
+ { .compatible = "qcom,msm8916-a53pll" },
+ { .compatible = "qcom,msm8939-a53pll" },
+ { }
+};
+MODULE_DEVICE_TABLE(of, qcom_a53pll_match_table);
+
+static struct platform_driver qcom_a53pll_driver = {
+ .probe = qcom_a53pll_probe,
+ .driver = {
+ .name = "qcom-a53pll",
+ .of_match_table = qcom_a53pll_match_table,
+ },
+};
+module_platform_driver(qcom_a53pll_driver);
+
+MODULE_DESCRIPTION("Qualcomm A53 PLL Driver");
+MODULE_LICENSE("GPL v2");