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path: root/drivers/net/ibm_emac/ibm_emac_rgmii.c
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Diffstat (limited to 'drivers/net/ibm_emac/ibm_emac_rgmii.c')
-rw-r--r--drivers/net/ibm_emac/ibm_emac_rgmii.c201
1 files changed, 201 insertions, 0 deletions
diff --git a/drivers/net/ibm_emac/ibm_emac_rgmii.c b/drivers/net/ibm_emac/ibm_emac_rgmii.c
new file mode 100644
index 000000000000..f0b1ffb2dbbf
--- /dev/null
+++ b/drivers/net/ibm_emac/ibm_emac_rgmii.c
@@ -0,0 +1,201 @@
+/*
+ * drivers/net/ibm_emac/ibm_emac_rgmii.c
+ *
+ * Driver for PowerPC 4xx on-chip ethernet controller, RGMII bridge support.
+ *
+ * Copyright (c) 2004, 2005 Zultys Technologies.
+ * Eugene Surovegin <eugene.surovegin@zultys.com> or <ebs@ebshome.net>
+ *
+ * Based on original work by
+ * Matt Porter <mporter@kernel.crashing.org>
+ * Copyright 2004 MontaVista Software, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ */
+#include <linux/config.h>
+#include <linux/kernel.h>
+#include <linux/ethtool.h>
+#include <asm/io.h>
+
+#include "ibm_emac_core.h"
+#include "ibm_emac_debug.h"
+
+/* RGMIIx_FER */
+#define RGMII_FER_MASK(idx) (0x7 << ((idx) * 4))
+#define RGMII_FER_RTBI(idx) (0x4 << ((idx) * 4))
+#define RGMII_FER_RGMII(idx) (0x5 << ((idx) * 4))
+#define RGMII_FER_TBI(idx) (0x6 << ((idx) * 4))
+#define RGMII_FER_GMII(idx) (0x7 << ((idx) * 4))
+
+/* RGMIIx_SSR */
+#define RGMII_SSR_MASK(idx) (0x7 << ((idx) * 8))
+#define RGMII_SSR_100(idx) (0x2 << ((idx) * 8))
+#define RGMII_SSR_1000(idx) (0x4 << ((idx) * 8))
+
+/* RGMII bridge supports only GMII/TBI and RGMII/RTBI PHYs */
+static inline int rgmii_valid_mode(int phy_mode)
+{
+ return phy_mode == PHY_MODE_GMII ||
+ phy_mode == PHY_MODE_RGMII ||
+ phy_mode == PHY_MODE_TBI ||
+ phy_mode == PHY_MODE_RTBI;
+}
+
+static inline const char *rgmii_mode_name(int mode)
+{
+ switch (mode) {
+ case PHY_MODE_RGMII:
+ return "RGMII";
+ case PHY_MODE_TBI:
+ return "TBI";
+ case PHY_MODE_GMII:
+ return "GMII";
+ case PHY_MODE_RTBI:
+ return "RTBI";
+ default:
+ BUG();
+ }
+}
+
+static inline u32 rgmii_mode_mask(int mode, int input)
+{
+ switch (mode) {
+ case PHY_MODE_RGMII:
+ return RGMII_FER_RGMII(input);
+ case PHY_MODE_TBI:
+ return RGMII_FER_TBI(input);
+ case PHY_MODE_GMII:
+ return RGMII_FER_GMII(input);
+ case PHY_MODE_RTBI:
+ return RGMII_FER_RTBI(input);
+ default:
+ BUG();
+ }
+}
+
+static int __init rgmii_init(struct ocp_device *ocpdev, int input, int mode)
+{
+ struct ibm_ocp_rgmii *dev = ocp_get_drvdata(ocpdev);
+ struct rgmii_regs *p;
+
+ RGMII_DBG("%d: init(%d, %d)" NL, ocpdev->def->index, input, mode);
+
+ if (!dev) {
+ dev = kzalloc(sizeof(struct ibm_ocp_rgmii), GFP_KERNEL);
+ if (!dev) {
+ printk(KERN_ERR
+ "rgmii%d: couldn't allocate device structure!\n",
+ ocpdev->def->index);
+ return -ENOMEM;
+ }
+
+ p = (struct rgmii_regs *)ioremap(ocpdev->def->paddr,
+ sizeof(struct rgmii_regs));
+ if (!p) {
+ printk(KERN_ERR
+ "rgmii%d: could not ioremap device registers!\n",
+ ocpdev->def->index);
+ kfree(dev);
+ return -ENOMEM;
+ }
+
+ dev->base = p;
+ ocp_set_drvdata(ocpdev, dev);
+
+ /* Disable all inputs by default */
+ out_be32(&p->fer, 0);
+ } else
+ p = dev->base;
+
+ /* Enable this input */
+ out_be32(&p->fer, in_be32(&p->fer) | rgmii_mode_mask(mode, input));
+
+ printk(KERN_NOTICE "rgmii%d: input %d in %s mode\n",
+ ocpdev->def->index, input, rgmii_mode_name(mode));
+
+ ++dev->users;
+ return 0;
+}
+
+int __init rgmii_attach(void *emac)
+{
+ struct ocp_enet_private *dev = emac;
+ struct ocp_func_emac_data *emacdata = dev->def->additions;
+
+ /* Check if we need to attach to a RGMII */
+ if (emacdata->rgmii_idx >= 0 && rgmii_valid_mode(emacdata->phy_mode)) {
+ dev->rgmii_input = emacdata->rgmii_mux;
+ dev->rgmii_dev =
+ ocp_find_device(OCP_VENDOR_IBM, OCP_FUNC_RGMII,
+ emacdata->rgmii_idx);
+ if (!dev->rgmii_dev) {
+ printk(KERN_ERR "emac%d: unknown rgmii%d!\n",
+ dev->def->index, emacdata->rgmii_idx);
+ return -ENODEV;
+ }
+ if (rgmii_init
+ (dev->rgmii_dev, dev->rgmii_input, emacdata->phy_mode)) {
+ printk(KERN_ERR
+ "emac%d: rgmii%d initialization failed!\n",
+ dev->def->index, emacdata->rgmii_idx);
+ return -ENODEV;
+ }
+ }
+ return 0;
+}
+
+void rgmii_set_speed(struct ocp_device *ocpdev, int input, int speed)
+{
+ struct ibm_ocp_rgmii *dev = ocp_get_drvdata(ocpdev);
+ u32 ssr = in_be32(&dev->base->ssr) & ~RGMII_SSR_MASK(input);
+
+ RGMII_DBG("%d: speed(%d, %d)" NL, ocpdev->def->index, input, speed);
+
+ if (speed == SPEED_1000)
+ ssr |= RGMII_SSR_1000(input);
+ else if (speed == SPEED_100)
+ ssr |= RGMII_SSR_100(input);
+
+ out_be32(&dev->base->ssr, ssr);
+}
+
+void __exit __rgmii_fini(struct ocp_device *ocpdev, int input)
+{
+ struct ibm_ocp_rgmii *dev = ocp_get_drvdata(ocpdev);
+ BUG_ON(!dev || dev->users == 0);
+
+ RGMII_DBG("%d: fini(%d)" NL, ocpdev->def->index, input);
+
+ /* Disable this input */
+ out_be32(&dev->base->fer,
+ in_be32(&dev->base->fer) & ~RGMII_FER_MASK(input));
+
+ if (!--dev->users) {
+ /* Free everything if this is the last user */
+ ocp_set_drvdata(ocpdev, NULL);
+ iounmap((void *)dev->base);
+ kfree(dev);
+ }
+}
+
+int __rgmii_get_regs_len(struct ocp_device *ocpdev)
+{
+ return sizeof(struct emac_ethtool_regs_subhdr) +
+ sizeof(struct rgmii_regs);
+}
+
+void *rgmii_dump_regs(struct ocp_device *ocpdev, void *buf)
+{
+ struct ibm_ocp_rgmii *dev = ocp_get_drvdata(ocpdev);
+ struct emac_ethtool_regs_subhdr *hdr = buf;
+ struct rgmii_regs *regs = (struct rgmii_regs *)(hdr + 1);
+
+ hdr->version = 0;
+ hdr->index = ocpdev->def->index;
+ memcpy_fromio(regs, dev->base, sizeof(struct rgmii_regs));
+ return regs + 1;
+}