Mugunthan V N | 5892cd1 | 2013-09-21 00:50:39 +0530 | [diff] [blame] | 1 | /* Texas Instruments Ethernet Switch Driver |
| 2 | * |
| 3 | * Copyright (C) 2013 Texas Instruments |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or |
| 6 | * modify it under the terms of the GNU General Public License |
| 7 | * version 2 as published by the Free Software Foundation. |
| 8 | * |
| 9 | * This program is distributed "as is" WITHOUT ANY WARRANTY of any |
| 10 | * kind, whether express or implied; without even the implied warranty |
| 11 | * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | * GNU General Public License for more details. |
| 13 | */ |
| 14 | |
| 15 | #include <linux/platform_device.h> |
| 16 | #include <linux/module.h> |
| 17 | #include <linux/netdevice.h> |
| 18 | #include <linux/phy.h> |
| 19 | #include <linux/of.h> |
| 20 | #include <linux/of_device.h> |
| 21 | |
| 22 | #include "cpsw.h" |
| 23 | |
| 24 | /* AM33xx SoC specific definitions for the CONTROL port */ |
| 25 | #define AM33XX_GMII_SEL_MODE_MII 0 |
| 26 | #define AM33XX_GMII_SEL_MODE_RMII 1 |
| 27 | #define AM33XX_GMII_SEL_MODE_RGMII 2 |
| 28 | |
| 29 | #define AM33XX_GMII_SEL_RMII2_IO_CLK_EN BIT(7) |
| 30 | #define AM33XX_GMII_SEL_RMII1_IO_CLK_EN BIT(6) |
| 31 | |
| 32 | struct cpsw_phy_sel_priv { |
| 33 | struct device *dev; |
| 34 | u32 __iomem *gmii_sel; |
| 35 | bool rmii_clock_external; |
| 36 | void (*cpsw_phy_sel)(struct cpsw_phy_sel_priv *priv, |
| 37 | phy_interface_t phy_mode, int slave); |
| 38 | }; |
| 39 | |
| 40 | |
| 41 | static void cpsw_gmii_sel_am3352(struct cpsw_phy_sel_priv *priv, |
| 42 | phy_interface_t phy_mode, int slave) |
| 43 | { |
| 44 | u32 reg; |
| 45 | u32 mask; |
| 46 | u32 mode = 0; |
| 47 | |
| 48 | reg = readl(priv->gmii_sel); |
| 49 | |
| 50 | switch (phy_mode) { |
| 51 | case PHY_INTERFACE_MODE_RMII: |
| 52 | mode = AM33XX_GMII_SEL_MODE_RMII; |
| 53 | break; |
| 54 | |
| 55 | case PHY_INTERFACE_MODE_RGMII: |
| 56 | case PHY_INTERFACE_MODE_RGMII_ID: |
| 57 | case PHY_INTERFACE_MODE_RGMII_RXID: |
| 58 | case PHY_INTERFACE_MODE_RGMII_TXID: |
| 59 | mode = AM33XX_GMII_SEL_MODE_RGMII; |
| 60 | break; |
| 61 | |
| 62 | case PHY_INTERFACE_MODE_MII: |
| 63 | default: |
| 64 | mode = AM33XX_GMII_SEL_MODE_MII; |
| 65 | break; |
| 66 | }; |
| 67 | |
| 68 | mask = 0x3 << (slave * 2) | BIT(slave + 6); |
| 69 | mode <<= slave * 2; |
| 70 | |
| 71 | if (priv->rmii_clock_external) { |
| 72 | if (slave == 0) |
| 73 | mode |= AM33XX_GMII_SEL_RMII1_IO_CLK_EN; |
| 74 | else |
| 75 | mode |= AM33XX_GMII_SEL_RMII2_IO_CLK_EN; |
| 76 | } |
| 77 | |
| 78 | reg &= ~mask; |
| 79 | reg |= mode; |
| 80 | |
| 81 | writel(reg, priv->gmii_sel); |
| 82 | } |
| 83 | |
| 84 | static struct platform_driver cpsw_phy_sel_driver; |
| 85 | static int match(struct device *dev, void *data) |
| 86 | { |
| 87 | struct device_node *node = (struct device_node *)data; |
| 88 | return dev->of_node == node && |
| 89 | dev->driver == &cpsw_phy_sel_driver.driver; |
| 90 | } |
| 91 | |
| 92 | void cpsw_phy_sel(struct device *dev, phy_interface_t phy_mode, int slave) |
| 93 | { |
| 94 | struct device_node *node; |
| 95 | struct cpsw_phy_sel_priv *priv; |
| 96 | |
| 97 | node = of_get_child_by_name(dev->of_node, "cpsw-phy-sel"); |
| 98 | if (!node) { |
| 99 | dev_err(dev, "Phy mode driver DT not found\n"); |
| 100 | return; |
| 101 | } |
| 102 | |
| 103 | dev = bus_find_device(&platform_bus_type, NULL, node, match); |
| 104 | priv = dev_get_drvdata(dev); |
| 105 | |
| 106 | priv->cpsw_phy_sel(priv, phy_mode, slave); |
| 107 | } |
| 108 | EXPORT_SYMBOL_GPL(cpsw_phy_sel); |
| 109 | |
| 110 | static const struct of_device_id cpsw_phy_sel_id_table[] = { |
| 111 | { |
| 112 | .compatible = "ti,am3352-cpsw-phy-sel", |
| 113 | .data = &cpsw_gmii_sel_am3352, |
| 114 | }, |
| 115 | {} |
| 116 | }; |
| 117 | MODULE_DEVICE_TABLE(of, cpsw_phy_sel_id_table); |
| 118 | |
| 119 | static int cpsw_phy_sel_probe(struct platform_device *pdev) |
| 120 | { |
| 121 | struct resource *res; |
| 122 | const struct of_device_id *of_id; |
| 123 | struct cpsw_phy_sel_priv *priv; |
| 124 | |
| 125 | of_id = of_match_node(cpsw_phy_sel_id_table, pdev->dev.of_node); |
| 126 | if (!of_id) |
| 127 | return -EINVAL; |
| 128 | |
| 129 | priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); |
| 130 | if (!priv) { |
| 131 | dev_err(&pdev->dev, "unable to alloc memory for cpsw phy sel\n"); |
| 132 | return -ENOMEM; |
| 133 | } |
| 134 | |
| 135 | priv->cpsw_phy_sel = of_id->data; |
| 136 | |
| 137 | res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "gmii-sel"); |
| 138 | priv->gmii_sel = devm_ioremap_resource(&pdev->dev, res); |
| 139 | if (IS_ERR(priv->gmii_sel)) |
| 140 | return PTR_ERR(priv->gmii_sel); |
| 141 | |
| 142 | if (of_find_property(pdev->dev.of_node, "rmii-clock-ext", NULL)) |
| 143 | priv->rmii_clock_external = true; |
| 144 | |
| 145 | dev_set_drvdata(&pdev->dev, priv); |
| 146 | |
| 147 | return 0; |
| 148 | } |
| 149 | |
| 150 | static struct platform_driver cpsw_phy_sel_driver = { |
| 151 | .probe = cpsw_phy_sel_probe, |
| 152 | .driver = { |
| 153 | .name = "cpsw-phy-sel", |
| 154 | .owner = THIS_MODULE, |
Sachin Kamat | 2afc6dff | 2013-09-30 09:55:13 +0530 | [diff] [blame] | 155 | .of_match_table = cpsw_phy_sel_id_table, |
Mugunthan V N | 5892cd1 | 2013-09-21 00:50:39 +0530 | [diff] [blame] | 156 | }, |
| 157 | }; |
| 158 | |
| 159 | module_platform_driver(cpsw_phy_sel_driver); |
| 160 | MODULE_AUTHOR("Mugunthan V N <mugunthanvnm@ti.com>"); |
| 161 | MODULE_LICENSE("GPL v2"); |