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authorMatt Porter <mporter@linaro.org>2013-12-19 18:23:09 +0400
committerFelipe Balbi <balbi@ti.com>2013-12-24 00:33:02 +0400
commit7597fdfca983025a3de91d4b3cf7b21ba452003c (patch)
tree987f56d57b710be7aaf8ebecdc200fc0a9f4df5e /drivers/phy/phy-bcm-kona-usb2.c
parent26799f1d23d07c2c4db2ccdba43c0e61baeaebee (diff)
downloadlinux-7597fdfca983025a3de91d4b3cf7b21ba452003c.tar.xz
phy: add Broadcom Kona USB2 PHY driver
Add a driver for the internal Broadcom Kona USB 2.0 PHY found on the BCM281xx family of SoCs. Signed-off-by: Matt Porter <mporter@linaro.org> Signed-off-by: Felipe Balbi <balbi@ti.com>
Diffstat (limited to 'drivers/phy/phy-bcm-kona-usb2.c')
-rw-r--r--drivers/phy/phy-bcm-kona-usb2.c158
1 files changed, 158 insertions, 0 deletions
diff --git a/drivers/phy/phy-bcm-kona-usb2.c b/drivers/phy/phy-bcm-kona-usb2.c
new file mode 100644
index 000000000000..efc5c1a13a5d
--- /dev/null
+++ b/drivers/phy/phy-bcm-kona-usb2.c
@@ -0,0 +1,158 @@
+/*
+ * phy-bcm-kona-usb2.c - Broadcom Kona USB2 Phy Driver
+ *
+ * Copyright (C) 2013 Linaro Limited
+ * Matt Porter <mporter@linaro.org>
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/phy/phy.h>
+#include <linux/platform_device.h>
+
+#define OTGCTL (0)
+#define OTGCTL_OTGSTAT2 BIT(31)
+#define OTGCTL_OTGSTAT1 BIT(30)
+#define OTGCTL_PRST_N_SW BIT(11)
+#define OTGCTL_HRESET_N BIT(10)
+#define OTGCTL_UTMI_LINE_STATE1 BIT(9)
+#define OTGCTL_UTMI_LINE_STATE0 BIT(8)
+
+#define P1CTL (8)
+#define P1CTL_SOFT_RESET BIT(1)
+#define P1CTL_NON_DRIVING BIT(0)
+
+struct bcm_kona_usb {
+ void __iomem *regs;
+};
+
+static void bcm_kona_usb_phy_power(struct bcm_kona_usb *phy, int on)
+{
+ u32 val;
+
+ val = readl(phy->regs + OTGCTL);
+ if (on) {
+ /* Configure and power PHY */
+ val &= ~(OTGCTL_OTGSTAT2 | OTGCTL_OTGSTAT1 |
+ OTGCTL_UTMI_LINE_STATE1 | OTGCTL_UTMI_LINE_STATE0);
+ val |= OTGCTL_PRST_N_SW | OTGCTL_HRESET_N;
+ } else {
+ val &= ~(OTGCTL_PRST_N_SW | OTGCTL_HRESET_N);
+ }
+ writel(val, phy->regs + OTGCTL);
+}
+
+static int bcm_kona_usb_phy_init(struct phy *gphy)
+{
+ struct bcm_kona_usb *phy = phy_get_drvdata(gphy);
+ u32 val;
+
+ /* Soft reset PHY */
+ val = readl(phy->regs + P1CTL);
+ val &= ~P1CTL_NON_DRIVING;
+ val |= P1CTL_SOFT_RESET;
+ writel(val, phy->regs + P1CTL);
+ writel(val & ~P1CTL_SOFT_RESET, phy->regs + P1CTL);
+ /* Reset needs to be asserted for 2ms */
+ mdelay(2);
+ writel(val | P1CTL_SOFT_RESET, phy->regs + P1CTL);
+
+ return 0;
+}
+
+static int bcm_kona_usb_phy_power_on(struct phy *gphy)
+{
+ struct bcm_kona_usb *phy = phy_get_drvdata(gphy);
+
+ bcm_kona_usb_phy_power(phy, 1);
+
+ return 0;
+}
+
+static int bcm_kona_usb_phy_power_off(struct phy *gphy)
+{
+ struct bcm_kona_usb *phy = phy_get_drvdata(gphy);
+
+ bcm_kona_usb_phy_power(phy, 0);
+
+ return 0;
+}
+
+static struct phy_ops ops = {
+ .init = bcm_kona_usb_phy_init,
+ .power_on = bcm_kona_usb_phy_power_on,
+ .power_off = bcm_kona_usb_phy_power_off,
+ .owner = THIS_MODULE,
+};
+
+static int bcm_kona_usb2_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct bcm_kona_usb *phy;
+ struct resource *res;
+ struct phy *gphy;
+ struct phy_provider *phy_provider;
+
+ phy = devm_kzalloc(dev, sizeof(*phy), GFP_KERNEL);
+ if (!phy)
+ return -ENOMEM;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ phy->regs = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(phy->regs))
+ return PTR_ERR(phy->regs);
+
+ platform_set_drvdata(pdev, phy);
+
+ gphy = devm_phy_create(dev, &ops, NULL);
+ if (IS_ERR(gphy))
+ return PTR_ERR(gphy);
+
+ /* The Kona PHY supports an 8-bit wide UTMI interface */
+ phy_set_bus_width(gphy, 8);
+
+ phy_set_drvdata(gphy, phy);
+
+ phy_provider = devm_of_phy_provider_register(dev,
+ of_phy_simple_xlate);
+ if (IS_ERR(phy_provider))
+ return PTR_ERR(phy_provider);
+
+ return 0;
+}
+
+static const struct of_device_id bcm_kona_usb2_dt_ids[] = {
+ { .compatible = "brcm,kona-usb2-phy" },
+ { /* sentinel */ }
+};
+
+MODULE_DEVICE_TABLE(of, bcm_kona_usb2_dt_ids);
+
+static struct platform_driver bcm_kona_usb2_driver = {
+ .probe = bcm_kona_usb2_probe,
+ .driver = {
+ .name = "bcm-kona-usb2",
+ .owner = THIS_MODULE,
+ .of_match_table = bcm_kona_usb2_dt_ids,
+ },
+};
+
+module_platform_driver(bcm_kona_usb2_driver);
+
+MODULE_ALIAS("platform:bcm-kona-usb2");
+MODULE_AUTHOR("Matt Porter <mporter@linaro.org>");
+MODULE_DESCRIPTION("BCM Kona USB 2.0 PHY driver");
+MODULE_LICENSE("GPL v2");