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path: root/drivers/phy/st/phy-spear1310-miphy.c
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Diffstat (limited to 'drivers/phy/st/phy-spear1310-miphy.c')
-rw-r--r--drivers/phy/st/phy-spear1310-miphy.c261
1 files changed, 261 insertions, 0 deletions
diff --git a/drivers/phy/st/phy-spear1310-miphy.c b/drivers/phy/st/phy-spear1310-miphy.c
new file mode 100644
index 000000000000..ed67e98e54ca
--- /dev/null
+++ b/drivers/phy/st/phy-spear1310-miphy.c
@@ -0,0 +1,261 @@
+/*
+ * ST SPEAr1310-miphy driver
+ *
+ * Copyright (C) 2014 ST Microelectronics
+ * Pratyush Anand <pratyush.anand@gmail.com>
+ * Mohit Kumar <mohit.kumar.dhaka@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#include <linux/bitops.h>
+#include <linux/delay.h>
+#include <linux/dma-mapping.h>
+#include <linux/kernel.h>
+#include <linux/mfd/syscon.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/phy/phy.h>
+#include <linux/regmap.h>
+
+/* SPEAr1310 Registers */
+#define SPEAR1310_PCIE_SATA_CFG 0x3A4
+ #define SPEAR1310_PCIE_SATA2_SEL_PCIE (0 << 31)
+ #define SPEAR1310_PCIE_SATA1_SEL_PCIE (0 << 30)
+ #define SPEAR1310_PCIE_SATA0_SEL_PCIE (0 << 29)
+ #define SPEAR1310_PCIE_SATA2_SEL_SATA BIT(31)
+ #define SPEAR1310_PCIE_SATA1_SEL_SATA BIT(30)
+ #define SPEAR1310_PCIE_SATA0_SEL_SATA BIT(29)
+ #define SPEAR1310_SATA2_CFG_TX_CLK_EN BIT(27)
+ #define SPEAR1310_SATA2_CFG_RX_CLK_EN BIT(26)
+ #define SPEAR1310_SATA2_CFG_POWERUP_RESET BIT(25)
+ #define SPEAR1310_SATA2_CFG_PM_CLK_EN BIT(24)
+ #define SPEAR1310_SATA1_CFG_TX_CLK_EN BIT(23)
+ #define SPEAR1310_SATA1_CFG_RX_CLK_EN BIT(22)
+ #define SPEAR1310_SATA1_CFG_POWERUP_RESET BIT(21)
+ #define SPEAR1310_SATA1_CFG_PM_CLK_EN BIT(20)
+ #define SPEAR1310_SATA0_CFG_TX_CLK_EN BIT(19)
+ #define SPEAR1310_SATA0_CFG_RX_CLK_EN BIT(18)
+ #define SPEAR1310_SATA0_CFG_POWERUP_RESET BIT(17)
+ #define SPEAR1310_SATA0_CFG_PM_CLK_EN BIT(16)
+ #define SPEAR1310_PCIE2_CFG_DEVICE_PRESENT BIT(11)
+ #define SPEAR1310_PCIE2_CFG_POWERUP_RESET BIT(10)
+ #define SPEAR1310_PCIE2_CFG_CORE_CLK_EN BIT(9)
+ #define SPEAR1310_PCIE2_CFG_AUX_CLK_EN BIT(8)
+ #define SPEAR1310_PCIE1_CFG_DEVICE_PRESENT BIT(7)
+ #define SPEAR1310_PCIE1_CFG_POWERUP_RESET BIT(6)
+ #define SPEAR1310_PCIE1_CFG_CORE_CLK_EN BIT(5)
+ #define SPEAR1310_PCIE1_CFG_AUX_CLK_EN BIT(4)
+ #define SPEAR1310_PCIE0_CFG_DEVICE_PRESENT BIT(3)
+ #define SPEAR1310_PCIE0_CFG_POWERUP_RESET BIT(2)
+ #define SPEAR1310_PCIE0_CFG_CORE_CLK_EN BIT(1)
+ #define SPEAR1310_PCIE0_CFG_AUX_CLK_EN BIT(0)
+
+ #define SPEAR1310_PCIE_CFG_MASK(x) ((0xF << (x * 4)) | BIT((x + 29)))
+ #define SPEAR1310_SATA_CFG_MASK(x) ((0xF << (x * 4 + 16)) | \
+ BIT((x + 29)))
+ #define SPEAR1310_PCIE_CFG_VAL(x) \
+ (SPEAR1310_PCIE_SATA##x##_SEL_PCIE | \
+ SPEAR1310_PCIE##x##_CFG_AUX_CLK_EN | \
+ SPEAR1310_PCIE##x##_CFG_CORE_CLK_EN | \
+ SPEAR1310_PCIE##x##_CFG_POWERUP_RESET | \
+ SPEAR1310_PCIE##x##_CFG_DEVICE_PRESENT)
+ #define SPEAR1310_SATA_CFG_VAL(x) \
+ (SPEAR1310_PCIE_SATA##x##_SEL_SATA | \
+ SPEAR1310_SATA##x##_CFG_PM_CLK_EN | \
+ SPEAR1310_SATA##x##_CFG_POWERUP_RESET | \
+ SPEAR1310_SATA##x##_CFG_RX_CLK_EN | \
+ SPEAR1310_SATA##x##_CFG_TX_CLK_EN)
+
+#define SPEAR1310_PCIE_MIPHY_CFG_1 0x3A8
+ #define SPEAR1310_MIPHY_DUAL_OSC_BYPASS_EXT BIT(31)
+ #define SPEAR1310_MIPHY_DUAL_CLK_REF_DIV2 BIT(28)
+ #define SPEAR1310_MIPHY_DUAL_PLL_RATIO_TOP(x) (x << 16)
+ #define SPEAR1310_MIPHY_SINGLE_OSC_BYPASS_EXT BIT(15)
+ #define SPEAR1310_MIPHY_SINGLE_CLK_REF_DIV2 BIT(12)
+ #define SPEAR1310_MIPHY_SINGLE_PLL_RATIO_TOP(x) (x << 0)
+ #define SPEAR1310_PCIE_SATA_MIPHY_CFG_SATA_MASK (0xFFFF)
+ #define SPEAR1310_PCIE_SATA_MIPHY_CFG_PCIE_MASK (0xFFFF << 16)
+ #define SPEAR1310_PCIE_SATA_MIPHY_CFG_SATA \
+ (SPEAR1310_MIPHY_DUAL_OSC_BYPASS_EXT | \
+ SPEAR1310_MIPHY_DUAL_CLK_REF_DIV2 | \
+ SPEAR1310_MIPHY_DUAL_PLL_RATIO_TOP(60) | \
+ SPEAR1310_MIPHY_SINGLE_OSC_BYPASS_EXT | \
+ SPEAR1310_MIPHY_SINGLE_CLK_REF_DIV2 | \
+ SPEAR1310_MIPHY_SINGLE_PLL_RATIO_TOP(60))
+ #define SPEAR1310_PCIE_SATA_MIPHY_CFG_SATA_25M_CRYSTAL_CLK \
+ (SPEAR1310_MIPHY_SINGLE_PLL_RATIO_TOP(120))
+ #define SPEAR1310_PCIE_SATA_MIPHY_CFG_PCIE \
+ (SPEAR1310_MIPHY_DUAL_OSC_BYPASS_EXT | \
+ SPEAR1310_MIPHY_DUAL_PLL_RATIO_TOP(25) | \
+ SPEAR1310_MIPHY_SINGLE_OSC_BYPASS_EXT | \
+ SPEAR1310_MIPHY_SINGLE_PLL_RATIO_TOP(25))
+
+#define SPEAR1310_PCIE_MIPHY_CFG_2 0x3AC
+
+enum spear1310_miphy_mode {
+ SATA,
+ PCIE,
+};
+
+struct spear1310_miphy_priv {
+ /* instance id of this phy */
+ u32 id;
+ /* phy mode: 0 for SATA 1 for PCIe */
+ enum spear1310_miphy_mode mode;
+ /* regmap for any soc specific misc registers */
+ struct regmap *misc;
+ /* phy struct pointer */
+ struct phy *phy;
+};
+
+static int spear1310_miphy_pcie_init(struct spear1310_miphy_priv *priv)
+{
+ u32 val;
+
+ regmap_update_bits(priv->misc, SPEAR1310_PCIE_MIPHY_CFG_1,
+ SPEAR1310_PCIE_SATA_MIPHY_CFG_PCIE_MASK,
+ SPEAR1310_PCIE_SATA_MIPHY_CFG_PCIE);
+
+ switch (priv->id) {
+ case 0:
+ val = SPEAR1310_PCIE_CFG_VAL(0);
+ break;
+ case 1:
+ val = SPEAR1310_PCIE_CFG_VAL(1);
+ break;
+ case 2:
+ val = SPEAR1310_PCIE_CFG_VAL(2);
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ regmap_update_bits(priv->misc, SPEAR1310_PCIE_SATA_CFG,
+ SPEAR1310_PCIE_CFG_MASK(priv->id), val);
+
+ return 0;
+}
+
+static int spear1310_miphy_pcie_exit(struct spear1310_miphy_priv *priv)
+{
+ regmap_update_bits(priv->misc, SPEAR1310_PCIE_SATA_CFG,
+ SPEAR1310_PCIE_CFG_MASK(priv->id), 0);
+
+ regmap_update_bits(priv->misc, SPEAR1310_PCIE_MIPHY_CFG_1,
+ SPEAR1310_PCIE_SATA_MIPHY_CFG_PCIE_MASK, 0);
+
+ return 0;
+}
+
+static int spear1310_miphy_init(struct phy *phy)
+{
+ struct spear1310_miphy_priv *priv = phy_get_drvdata(phy);
+ int ret = 0;
+
+ if (priv->mode == PCIE)
+ ret = spear1310_miphy_pcie_init(priv);
+
+ return ret;
+}
+
+static int spear1310_miphy_exit(struct phy *phy)
+{
+ struct spear1310_miphy_priv *priv = phy_get_drvdata(phy);
+ int ret = 0;
+
+ if (priv->mode == PCIE)
+ ret = spear1310_miphy_pcie_exit(priv);
+
+ return ret;
+}
+
+static const struct of_device_id spear1310_miphy_of_match[] = {
+ { .compatible = "st,spear1310-miphy" },
+ { },
+};
+MODULE_DEVICE_TABLE(of, spear1310_miphy_of_match);
+
+static const struct phy_ops spear1310_miphy_ops = {
+ .init = spear1310_miphy_init,
+ .exit = spear1310_miphy_exit,
+ .owner = THIS_MODULE,
+};
+
+static struct phy *spear1310_miphy_xlate(struct device *dev,
+ struct of_phandle_args *args)
+{
+ struct spear1310_miphy_priv *priv = dev_get_drvdata(dev);
+
+ if (args->args_count < 1) {
+ dev_err(dev, "DT did not pass correct no of args\n");
+ return ERR_PTR(-ENODEV);
+ }
+
+ priv->mode = args->args[0];
+
+ if (priv->mode != SATA && priv->mode != PCIE) {
+ dev_err(dev, "DT did not pass correct phy mode\n");
+ return ERR_PTR(-ENODEV);
+ }
+
+ return priv->phy;
+}
+
+static int spear1310_miphy_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct spear1310_miphy_priv *priv;
+ struct phy_provider *phy_provider;
+
+ priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ priv->misc =
+ syscon_regmap_lookup_by_phandle(dev->of_node, "misc");
+ if (IS_ERR(priv->misc)) {
+ dev_err(dev, "failed to find misc regmap\n");
+ return PTR_ERR(priv->misc);
+ }
+
+ if (of_property_read_u32(dev->of_node, "phy-id", &priv->id)) {
+ dev_err(dev, "failed to find phy id\n");
+ return -EINVAL;
+ }
+
+ priv->phy = devm_phy_create(dev, NULL, &spear1310_miphy_ops);
+ if (IS_ERR(priv->phy)) {
+ dev_err(dev, "failed to create SATA PCIe PHY\n");
+ return PTR_ERR(priv->phy);
+ }
+
+ dev_set_drvdata(dev, priv);
+ phy_set_drvdata(priv->phy, priv);
+
+ phy_provider =
+ devm_of_phy_provider_register(dev, spear1310_miphy_xlate);
+ if (IS_ERR(phy_provider)) {
+ dev_err(dev, "failed to register phy provider\n");
+ return PTR_ERR(phy_provider);
+ }
+
+ return 0;
+}
+
+static struct platform_driver spear1310_miphy_driver = {
+ .probe = spear1310_miphy_probe,
+ .driver = {
+ .name = "spear1310-miphy",
+ .of_match_table = of_match_ptr(spear1310_miphy_of_match),
+ },
+};
+
+module_platform_driver(spear1310_miphy_driver);
+
+MODULE_DESCRIPTION("ST SPEAR1310-MIPHY driver");
+MODULE_AUTHOR("Pratyush Anand <pratyush.anand@gmail.com>");
+MODULE_LICENSE("GPL v2");
generated by cgit v1.2.3 (git 2.39.0) at 2024-11-28 20:52:39 +0300