[PATCH 3/6] net: cpsw: Add control-module macid driver
Markus Pargmann
mpa at pengutronix.de
Wed Dec 18 11:47:19 EST 2013
This driver extracts the hardware macid from the control module of
am335x processors. It exports a function cpsw_ctrl_macid_read for cpsw
to get the macid from within the processor.
This driver is not used, unless it is defined in DT and referenced by a
cpsw slave with a phandle.
Signed-off-by: Markus Pargmann <mpa at pengutronix.de>
---
.../devicetree/bindings/net/cpsw-ctrl-macid.txt | 31 +++++
drivers/net/ethernet/ti/Kconfig | 8 ++
drivers/net/ethernet/ti/Makefile | 1 +
drivers/net/ethernet/ti/cpsw-ctrl-macid.c | 138 +++++++++++++++++++++
4 files changed, 178 insertions(+)
create mode 100644 Documentation/devicetree/bindings/net/cpsw-ctrl-macid.txt
create mode 100644 drivers/net/ethernet/ti/cpsw-ctrl-macid.c
diff --git a/Documentation/devicetree/bindings/net/cpsw-ctrl-macid.txt b/Documentation/devicetree/bindings/net/cpsw-ctrl-macid.txt
new file mode 100644
index 0000000..abff2af
--- /dev/null
+++ b/Documentation/devicetree/bindings/net/cpsw-ctrl-macid.txt
@@ -0,0 +1,31 @@
+TI CPSW ctrl macid Devicetree bindings
+--------------------------------------
+
+Required properties:
+ - compatible : Should be "ti,am3352-cpsw-ctrl-macid"
+ - reg : physical base address and size of the cpsw
+ registers map
+ - reg-names : names of the register map given in "reg" node
+ - #ti,cpsw-ctrl-macid : Should be <1>
+
+When used from cpsw, "ti,mac-address-ctrl" should be a phandle to this device
+node with one argument, 0 or 1 to select the macid 0 or 1.
+
+Examples:
+
+ cpsw_ctrl_macid: cpsw-ctrl-macid at 44e10630 {
+ compatible = "ti,am3352-cpsw-ctrl-macid";
+ #ti,mac-address-ctrl-cells = <1>;
+ reg = <0x44e10630 0x16>;
+ reg-names = "ctrl-macid";
+ };
+
+Used in cpsw slave nodes like this:
+
+ cpsw_emac0: slave at 4a100200 {
+ ti,mac-address-ctrl = <&cpsw_ctrl_macid 0>;
+ };
+
+ cpsw_emac1: slave at 4a100300 {
+ ti,mac-address-ctrl = <&cpsw_ctrl_macid 1>;
+ };
diff --git a/drivers/net/ethernet/ti/Kconfig b/drivers/net/ethernet/ti/Kconfig
index 53150c2..24819ef 100644
--- a/drivers/net/ethernet/ti/Kconfig
+++ b/drivers/net/ethernet/ti/Kconfig
@@ -56,12 +56,20 @@ config TI_CPSW_PHY_SEL
This driver supports configuring of the phy mode connected to
the CPSW.
+config TI_CPSW_CTRL_MACID
+ boolean "TI CPSW internal MACID support"
+ depends on TI_CPSW
+ ---help---
+ This driver supports reading the hardcoded MACID from am33xx
+ processors control module.
+
config TI_CPSW
tristate "TI CPSW Switch Support"
depends on ARM && (ARCH_DAVINCI || SOC_AM33XX)
select TI_DAVINCI_CPDMA
select TI_DAVINCI_MDIO
select TI_CPSW_PHY_SEL
+ select TI_CPSW_CTRL_MACID
---help---
This driver supports TI's CPSW Ethernet Switch.
diff --git a/drivers/net/ethernet/ti/Makefile b/drivers/net/ethernet/ti/Makefile
index 9cfaab8..5a31c2b 100644
--- a/drivers/net/ethernet/ti/Makefile
+++ b/drivers/net/ethernet/ti/Makefile
@@ -8,5 +8,6 @@ obj-$(CONFIG_TI_DAVINCI_EMAC) += davinci_emac.o
obj-$(CONFIG_TI_DAVINCI_MDIO) += davinci_mdio.o
obj-$(CONFIG_TI_DAVINCI_CPDMA) += davinci_cpdma.o
obj-$(CONFIG_TI_CPSW_PHY_SEL) += cpsw-phy-sel.o
+obj-$(CONFIG_TI_CPSW_CTRL_MACID) += cpsw-ctrl-macid.o
obj-$(CONFIG_TI_CPSW) += ti_cpsw.o
ti_cpsw-y := cpsw_ale.o cpsw.o cpts.o
diff --git a/drivers/net/ethernet/ti/cpsw-ctrl-macid.c b/drivers/net/ethernet/ti/cpsw-ctrl-macid.c
new file mode 100644
index 0000000..e18c957
--- /dev/null
+++ b/drivers/net/ethernet/ti/cpsw-ctrl-macid.c
@@ -0,0 +1,138 @@
+/* CPSW Control Module MACID driver
+ *
+ * Copyright (C) 2013 Markus Pargmann <mpa at pengutronix.de>
+ *
+ * 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.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/platform_device.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+
+#include "cpsw.h"
+
+#define AM33XX_CTRL_MAC_LO_REG(id) (0x8 * id)
+#define AM33XX_CTRL_MAC_HI_REG(id) (0x8 * id + 0x4)
+
+struct cpsw_ctrl_macid {
+ struct device *dev;
+ u8 __iomem *ctrl_macid;
+ void (*cpsw_macid_get)(struct cpsw_ctrl_macid *priv, int slave,
+ u8 *mac_addr);
+};
+
+
+static void cpsw_ctrl_get_macid(struct cpsw_ctrl_macid *priv, int slave,
+ u8 *mac_addr)
+{
+ u32 macid_lo;
+ u32 macid_hi;
+
+ macid_lo = readl(priv->ctrl_macid + AM33XX_CTRL_MAC_LO_REG(slave));
+ macid_hi = readl(priv->ctrl_macid + AM33XX_CTRL_MAC_HI_REG(slave));
+
+ mac_addr[5] = (macid_lo >> 8) & 0xff;
+ mac_addr[4] = macid_lo & 0xff;
+ mac_addr[3] = (macid_hi >> 24) & 0xff;
+ mac_addr[2] = (macid_hi >> 16) & 0xff;
+ mac_addr[1] = (macid_hi >> 8) & 0xff;
+ mac_addr[0] = macid_hi & 0xff;
+}
+
+static struct platform_driver cpsw_ctrl_macid_driver;
+
+static int match(struct device *dev, void *data)
+{
+ struct device_node *node = (struct device_node *)data;
+
+ return dev->of_node == node &&
+ dev->driver == &cpsw_ctrl_macid_driver.driver;
+}
+
+int cpsw_ctrl_macid_read(struct device_node *np, u8 *mac_addr)
+{
+ struct device *ctrl_dev;
+ struct cpsw_ctrl_macid *priv;
+ struct of_phandle_args args;
+ int ret;
+
+ ret = of_parse_phandle_with_args(np, "ti,mac-address-ctrl",
+ "#ti,mac-address-ctrl-cells", 0, &args);
+ if (ret)
+ return ret;
+
+ if (args.args_count != 1 || args.args[0] < 0 || args.args[0] > 1) {
+ pr_err("Failed to parse ti,mac-address-module phandle because of invalid arguments\n");
+ return -EINVAL;
+ }
+
+ ctrl_dev = bus_find_device(&platform_bus_type, NULL, args.np, match);
+ priv = dev_get_drvdata(ctrl_dev);
+ of_node_put(args.np);
+ if (priv == NULL)
+ return -EPROBE_DEFER;
+
+ priv->cpsw_macid_get(priv, args.args[0], mac_addr);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(cpsw_ctrl_macid_read);
+
+static const struct of_device_id cpsw_ctrl_macid_of_ids[] = {
+ {
+ .compatible = "ti,am3352-cpsw-ctrl-macid",
+ .data = &cpsw_ctrl_get_macid,
+ },
+ {}
+};
+MODULE_DEVICE_TABLE(of, cpsw_ctrl_macid_of_ids);
+
+static int cpsw_ctrl_macid_probe(struct platform_device *pdev)
+{
+ struct resource *res;
+ const struct of_device_id *of_id;
+ struct cpsw_ctrl_macid *priv;
+
+ of_id = of_match_node(cpsw_ctrl_macid_of_ids, pdev->dev.of_node);
+ if (!of_id)
+ return -EINVAL;
+
+ priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv) {
+ dev_err(&pdev->dev, "unable to alloc memory for cpsw-ctrl-macid\n");
+ return -ENOMEM;
+ }
+
+ priv->cpsw_macid_get = of_id->data;
+
+ res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "ctrl-macid");
+ priv->ctrl_macid = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(priv->ctrl_macid))
+ return PTR_ERR(priv->ctrl_macid);
+
+ dev_set_drvdata(&pdev->dev, priv);
+
+ dev_info(&pdev->dev, "TI CPSW ctrl macid loaded\n");
+ return 0;
+}
+
+static struct platform_driver cpsw_ctrl_macid_driver = {
+ .probe = cpsw_ctrl_macid_probe,
+ .driver = {
+ .name = "cpsw-ctrl-macid",
+ .owner = THIS_MODULE,
+ .of_match_table = of_match_ptr(cpsw_ctrl_macid_of_ids),
+ },
+};
+
+module_platform_driver(cpsw_ctrl_macid_driver);
+MODULE_AUTHOR("Markus Pargmann <mpa at pengutronix.de>");
+MODULE_LICENSE("GPL v2");
--
1.8.5.1
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