[PATCH 3/9] phy: qcom: uniphy: Update UNIPHY driver to be a common driver
Praveenkumar I
quic_ipkumar at quicinc.com
Tue Aug 29 06:58:12 PDT 2023
This patch updates the UNIPHY driver to be a common driver to
accommodate all UNIPHY / Combo PHY. This driver can be used for
both USB and PCIe UNIPHY. Using phy-mul-sel from DTS MUX selection
for USB / PCIe can be acheived.
Signed-off-by: Praveenkumar I <quic_ipkumar at quicinc.com>
---
drivers/phy/qualcomm/phy-qcom-uniphy.c | 401 +++++++++++++++++++++----
1 file changed, 335 insertions(+), 66 deletions(-)
diff --git a/drivers/phy/qualcomm/phy-qcom-uniphy.c b/drivers/phy/qualcomm/phy-qcom-uniphy.c
index da6f290af722..eb71588f5417 100644
--- a/drivers/phy/qualcomm/phy-qcom-uniphy.c
+++ b/drivers/phy/qualcomm/phy-qcom-uniphy.c
@@ -5,141 +5,410 @@
* Based on code from
* Allwinner Technology Co., Ltd. <www.allwinnertech.com>
*
+ * Modified the driver to be common for Qualcomm UNIPHYs
+ * Copyright (c) 2023, The Linux Foundation. All rights reserved.
*/
+#include <linux/bitfield.h>
+#include <linux/clk.h>
+#include <linux/clk-provider.h>
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/kernel.h>
+#include <linux/mfd/syscon.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/of.h>
#include <linux/phy/phy.h>
#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/regulator/consumer.h>
#include <linux/reset.h>
-struct ipq4019_usb_phy {
+struct uniphy_init_tbl {
+ unsigned int offset;
+ unsigned int val;
+};
+
+#define UNIPHY_INIT_CFG(o, v) \
+ { \
+ .offset = o, \
+ .val = v, \
+ }
+
+struct uniphy_cfg {
+ const struct uniphy_init_tbl *init_seq;
+ int num_init_seq;
+ const char * const *clk_list;
+ int num_clks;
+ const char * const *reset_list;
+ int num_resets;
+ const char * const *vreg_list;
+ int num_vregs;
+ unsigned int pipe_clk_rate;
+ unsigned int reset_udelay;
+ unsigned int autoload_udelay;
+};
+
+struct qcom_uniphy {
struct device *dev;
+ const struct uniphy_cfg *cfg;
struct phy *phy;
void __iomem *base;
- struct reset_control *por_rst;
- struct reset_control *srif_rst;
+ struct clk_bulk_data *clks;
+ struct reset_control_bulk_data *resets;
+ struct regulator_bulk_data *vregs;
+ struct clk_fixed_rate pipe_clk_fixed;
+};
+
+static const char * const ipq4019_ssphy_reset_l[] = {
+ "por_rst",
+};
+
+static const struct uniphy_cfg ipq4019_usb_ssphy_cfg = {
+ .reset_list = ipq4019_ssphy_reset_l,
+ .num_resets = ARRAY_SIZE(ipq4019_ssphy_reset_l),
+ .reset_udelay = 10000,
+
};
-static int ipq4019_ss_phy_power_off(struct phy *_phy)
+static const char * const ipq4019_hsphy_reset_l[] = {
+ "por_rst", "srif_rst",
+};
+
+static const struct uniphy_cfg ipq4019_usb_hsphy_cfg = {
+ .reset_list = ipq4019_hsphy_reset_l,
+ .num_resets = ARRAY_SIZE(ipq4019_hsphy_reset_l),
+ .reset_udelay = 10000,
+};
+
+static int phy_mux_sel(struct phy *phy)
+{
+ struct qcom_uniphy *uniphy = phy_get_drvdata(phy);
+ struct device *dev = uniphy->dev;
+ struct regmap *tcsr;
+ unsigned int args[2];
+ int ret;
+
+ tcsr = syscon_regmap_lookup_by_phandle_args(dev->of_node, "qcom,phy-mux-sel",
+ ARRAY_SIZE(args), args);
+ if (IS_ERR(tcsr)) {
+ ret = PTR_ERR(tcsr);
+ if (ret == -ENOENT)
+ return 0;
+
+ dev_err(dev, "failed to lookup syscon for phy mux %d\n", ret);
+ return ret;
+ }
+
+ /* PHY MUX registers only have this BIT0 */
+ ret = regmap_write(tcsr, args[0], args[1]);
+ if (ret < 0) {
+ dev_err(dev, "PHY Mux selection failed: %d\n", ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+static int uniphy_enable(struct phy *phy)
{
- struct ipq4019_usb_phy *phy = phy_get_drvdata(_phy);
+ struct qcom_uniphy *uniphy = phy_get_drvdata(phy);
+ const struct uniphy_cfg *cfg = uniphy->cfg;
+ const struct uniphy_init_tbl *tbl;
+ void __iomem *base = uniphy->base;
+ int i, ret;
- reset_control_assert(phy->por_rst);
- msleep(10);
+ ret = regulator_bulk_enable(cfg->num_vregs, uniphy->vregs);
+ if (ret) {
+ dev_err(uniphy->dev, "failed to enable regulators: %d\n", ret);
+ return ret;
+ }
+
+ /* Assert all available resets */
+ for (i = 0; i < cfg->num_resets; i++) {
+ ret = reset_control_assert(uniphy->resets[i].rstc);
+ if (ret) {
+ dev_err(uniphy->dev, "reset assert failed: %d\n", ret);
+ goto err_assert_reset;
+ }
+ if (cfg->reset_udelay)
+ usleep_range(cfg->reset_udelay, cfg->reset_udelay + 10);
+ }
+
+ /* Deassert all available resets */
+ for (i = 0; i < cfg->num_resets; i++) {
+ ret = reset_control_deassert(uniphy->resets[i].rstc);
+ if (ret) {
+ dev_err(uniphy->dev, "reset deassert failed: %d\n", ret);
+ goto err_assert_reset;
+ }
+ if (cfg->reset_udelay)
+ usleep_range(cfg->reset_udelay, cfg->reset_udelay + 10);
+ }
+
+ ret = phy_mux_sel(phy);
+ if (ret < 0)
+ goto err_assert_reset;
+
+ ret = clk_bulk_prepare_enable(cfg->num_clks, uniphy->clks);
+ if (ret) {
+ dev_err(uniphy->dev, "failed to enable clocks: %d\n", ret);
+ goto err_assert_reset;
+ }
+
+ if (cfg->autoload_udelay)
+ usleep_range(cfg->autoload_udelay, cfg->autoload_udelay + 10);
+
+ if (cfg->num_init_seq) {
+ tbl = cfg->init_seq;
+ for (i = 0; i < cfg->num_init_seq; i++, tbl++)
+ writel(tbl->val, base + tbl->offset);
+ }
return 0;
+
+err_assert_reset:
+ /* Assert all available resets */
+ for (i = 0; i < cfg->num_resets; i++) {
+ reset_control_assert(uniphy->resets[i].rstc);
+ if (cfg->reset_udelay)
+ usleep_range(cfg->reset_udelay, cfg->reset_udelay + 10);
+ }
+
+ return ret;
}
-static int ipq4019_ss_phy_power_on(struct phy *_phy)
+static int uniphy_disable(struct phy *phy)
{
- struct ipq4019_usb_phy *phy = phy_get_drvdata(_phy);
+ struct qcom_uniphy *uniphy = phy_get_drvdata(phy);
+ const struct uniphy_cfg *cfg = uniphy->cfg;
+ int i;
- ipq4019_ss_phy_power_off(_phy);
+ /* Assert all available resets */
+ for (i = 0; i < cfg->num_resets; i++) {
+ reset_control_assert(uniphy->resets[i].rstc);
+ if (cfg->reset_udelay)
+ usleep_range(cfg->reset_udelay, cfg->reset_udelay + 10);
+ }
- reset_control_deassert(phy->por_rst);
+ clk_bulk_disable_unprepare(cfg->num_clks, uniphy->clks);
+
+ regulator_bulk_disable(cfg->num_vregs, uniphy->vregs);
return 0;
}
-static const struct phy_ops ipq4019_usb_ss_phy_ops = {
- .power_on = ipq4019_ss_phy_power_on,
- .power_off = ipq4019_ss_phy_power_off,
+static const struct phy_ops uniphy_phy_ops = {
+ .power_on = uniphy_enable,
+ .power_off = uniphy_disable,
+ .owner = THIS_MODULE,
};
-static int ipq4019_hs_phy_power_off(struct phy *_phy)
+static int qcom_uniphy_vreg_init(struct qcom_uniphy *uniphy)
+{
+ const struct uniphy_cfg *cfg = uniphy->cfg;
+ struct device *dev = uniphy->dev;
+ int i, ret;
+
+ uniphy->vregs = devm_kcalloc(dev, cfg->num_vregs,
+ sizeof(*uniphy->vregs), GFP_KERNEL);
+ if (!uniphy->vregs)
+ return -ENOMEM;
+
+ for (i = 0; i < cfg->num_vregs; i++)
+ uniphy->vregs[i].supply = cfg->vreg_list[i];
+
+ ret = devm_regulator_bulk_get(dev, cfg->num_vregs, uniphy->vregs);
+
+ if (ret)
+ return dev_err_probe(dev, ret, "failed to get regulators\n");
+
+ return 0;
+}
+
+static int qcom_uniphy_reset_init(struct qcom_uniphy *uniphy)
{
- struct ipq4019_usb_phy *phy = phy_get_drvdata(_phy);
+ const struct uniphy_cfg *cfg = uniphy->cfg;
+ struct device *dev = uniphy->dev;
+ int i, ret;
+
+ uniphy->resets = devm_kcalloc(dev, cfg->num_resets,
+ sizeof(*uniphy->resets), GFP_KERNEL);
+ if (!uniphy->resets)
+ return -ENOMEM;
- reset_control_assert(phy->por_rst);
- msleep(10);
+ for (i = 0; i < cfg->num_resets; i++)
+ uniphy->resets[i].id = cfg->reset_list[i];
- reset_control_assert(phy->srif_rst);
- msleep(10);
+ ret = devm_reset_control_bulk_get_exclusive(dev, cfg->num_resets, uniphy->resets);
+ if (ret)
+ return dev_err_probe(dev, ret, "failed to get resets\n");
return 0;
}
-static int ipq4019_hs_phy_power_on(struct phy *_phy)
+static int qcom_uniphy_clk_init(struct qcom_uniphy *uniphy)
{
- struct ipq4019_usb_phy *phy = phy_get_drvdata(_phy);
+ const struct uniphy_cfg *cfg = uniphy->cfg;
+ struct device *dev = uniphy->dev;
+ int i, ret;
- ipq4019_hs_phy_power_off(_phy);
- reset_control_deassert(phy->srif_rst);
- msleep(10);
+ uniphy->clks = devm_kcalloc(dev, cfg->num_clks,
+ sizeof(*uniphy->clks), GFP_KERNEL);
+ if (!uniphy->clks)
+ return -ENOMEM;
+
+ for (i = 0; i < cfg->num_clks; i++)
+ uniphy->clks[i].id = cfg->clk_list[i];
- reset_control_deassert(phy->por_rst);
+ ret = devm_clk_bulk_get(dev, cfg->num_clks, uniphy->clks);
+ if (ret)
+ return dev_err_probe(dev, ret, "failed to get clocks\n");
return 0;
}
-static const struct phy_ops ipq4019_usb_hs_phy_ops = {
- .power_on = ipq4019_hs_phy_power_on,
- .power_off = ipq4019_hs_phy_power_off,
-};
+static void phy_clk_release_provider(void *res)
+{
+ of_clk_del_provider(res);
+}
-static const struct of_device_id ipq4019_usb_phy_of_match[] = {
- { .compatible = "qcom,usb-hs-ipq4019-phy", .data = &ipq4019_usb_hs_phy_ops},
- { .compatible = "qcom,usb-ss-ipq4019-phy", .data = &ipq4019_usb_ss_phy_ops},
- { },
-};
-MODULE_DEVICE_TABLE(of, ipq4019_usb_phy_of_match);
+/*
+ * Register a fixed rate pipe clock.
+ *
+ * The <s>_pipe_clksrc generated by PHY goes to the GCC that gate
+ * controls it. The <s>_pipe_clk coming out of the GCC is requested
+ * by the PHY driver for its operations.
+ * We register the <s>_pipe_clksrc here. The gcc driver takes care
+ * of assigning this <s>_pipe_clksrc as parent to <s>_pipe_clk.
+ * Below picture shows this relationship.
+ *
+ * +---------------+
+ * | PHY block |<<---------------------------------------+
+ * | | |
+ * | +-------+ | +-----+ |
+ * I/P---^-->| PLL |---^--->pipe_clksrc--->| GCC |--->pipe_clk---+
+ * clk | +-------+ | +-----+
+ * +---------------+
+ */
+static int phy_pipe_clk_register(struct qcom_uniphy *uniphy, struct device_node *np)
+{
+ struct clk_fixed_rate *fixed = &uniphy->pipe_clk_fixed;
+ const struct uniphy_cfg *cfg = uniphy->cfg;
+ struct device *dev = uniphy->dev;
+ struct clk_init_data init = { };
+ int ret;
+
+ ret = of_property_read_string(np, "clock-output-names", &init.name);
+ if (ret) {
+ dev_err(dev, "%pOFn: No clock-output-names\n", np);
+ return ret;
+ }
+
+ init.ops = &clk_fixed_rate_ops;
+
+ fixed->fixed_rate = cfg->pipe_clk_rate;
+ fixed->hw.init = &init;
-static int ipq4019_usb_phy_probe(struct platform_device *pdev)
+ ret = devm_clk_hw_register(dev, &fixed->hw);
+ if (ret)
+ return ret;
+
+ ret = of_clk_add_hw_provider(np, of_clk_hw_simple_get, &fixed->hw);
+ if (ret)
+ return ret;
+
+ /*
+ * Roll a devm action because the clock provider is the child node, but
+ * the child node is not actually a device.
+ */
+ return devm_add_action_or_reset(dev, phy_clk_release_provider, np);
+}
+
+static int qcom_uniphy_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct phy_provider *phy_provider;
- struct ipq4019_usb_phy *phy;
+ struct qcom_uniphy *uniphy;
+ struct device_node *np;
+ int ret;
- phy = devm_kzalloc(dev, sizeof(*phy), GFP_KERNEL);
- if (!phy)
+ uniphy = devm_kzalloc(dev, sizeof(*uniphy), GFP_KERNEL);
+ if (!uniphy)
return -ENOMEM;
- phy->dev = &pdev->dev;
- phy->base = devm_platform_ioremap_resource(pdev, 0);
- if (IS_ERR(phy->base)) {
- dev_err(dev, "failed to remap register memory\n");
- return PTR_ERR(phy->base);
- }
+ uniphy->dev = dev;
- phy->por_rst = devm_reset_control_get(phy->dev, "por_rst");
- if (IS_ERR(phy->por_rst)) {
- if (PTR_ERR(phy->por_rst) != -EPROBE_DEFER)
- dev_err(dev, "POR reset is missing\n");
- return PTR_ERR(phy->por_rst);
+ uniphy->cfg = of_device_get_match_data(dev);
+ if (!uniphy->cfg)
+ return -EINVAL;
+
+ uniphy->base = devm_platform_ioremap_resource(pdev, 0);
+ if (IS_ERR(uniphy->base)) {
+ ret = PTR_ERR(uniphy->base);
+ dev_err_probe(dev, ret, "failed to remap register memory\n");
+ return ret;
}
- phy->srif_rst = devm_reset_control_get_optional(phy->dev, "srif_rst");
- if (IS_ERR(phy->srif_rst))
- return PTR_ERR(phy->srif_rst);
+ ret = qcom_uniphy_clk_init(uniphy);
+ if (ret)
+ return ret;
+
+ ret = qcom_uniphy_reset_init(uniphy);
+ if (ret)
+ return ret;
+
+ ret = qcom_uniphy_vreg_init(uniphy);
+ if (ret < 0)
+ return ret;
+
+ if (uniphy->cfg->pipe_clk_rate) {
+ np = of_node_get(dev->of_node);
+ ret = phy_pipe_clk_register(uniphy, np);
+ if (ret) {
+ dev_err_probe(dev, ret, "failed to register pipe clk\n");
+ goto err;
+ }
+ }
- phy->phy = devm_phy_create(dev, NULL, of_device_get_match_data(dev));
- if (IS_ERR(phy->phy)) {
- dev_err(dev, "failed to create PHY\n");
- return PTR_ERR(phy->phy);
+ uniphy->phy = devm_phy_create(dev, NULL, &uniphy_phy_ops);
+ if (IS_ERR(uniphy->phy)) {
+ ret = PTR_ERR(uniphy->phy);
+ dev_err_probe(dev, ret, "failed to create PHY\n");
+ goto err;
}
- phy_set_drvdata(phy->phy, phy);
+
+ phy_set_drvdata(uniphy->phy, uniphy);
phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
- return PTR_ERR_OR_ZERO(phy_provider);
+ ret = PTR_ERR_OR_ZERO(phy_provider);
+
+err:
+ if (uniphy->cfg->pipe_clk_rate)
+ of_node_put(np);
+ return ret;
}
-static struct platform_driver ipq4019_usb_phy_driver = {
- .probe = ipq4019_usb_phy_probe,
+static const struct of_device_id qcom_uniphy_of_match[] = {
+ { .compatible = "qcom,usb-hs-ipq4019-phy", .data = &ipq4019_usb_hsphy_cfg},
+ { .compatible = "qcom,usb-ss-ipq4019-phy", .data = &ipq4019_usb_ssphy_cfg},
+ { },
+};
+MODULE_DEVICE_TABLE(of, qcom_uniphy_of_match);
+
+static struct platform_driver qcom_uniphy_driver = {
+ .probe = qcom_uniphy_probe,
.driver = {
- .of_match_table = ipq4019_usb_phy_of_match,
- .name = "ipq4019-usb-phy",
+ .of_match_table = qcom_uniphy_of_match,
+ .name = "qcom-uniphy",
}
};
-module_platform_driver(ipq4019_usb_phy_driver);
+module_platform_driver(qcom_uniphy_driver);
-MODULE_DESCRIPTION("QCOM/IPQ4019 USB phy driver");
+MODULE_DESCRIPTION("QCOM uniphy driver");
MODULE_AUTHOR("John Crispin <john at phrozen.org>");
MODULE_LICENSE("GPL v2");
--
2.34.1
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