diff options
Diffstat (limited to 'drivers/net/ethernet/ibm/emac/zmii.c')
| -rw-r--r-- | drivers/net/ethernet/ibm/emac/zmii.c | 320 |
1 files changed, 320 insertions, 0 deletions
diff --git a/drivers/net/ethernet/ibm/emac/zmii.c b/drivers/net/ethernet/ibm/emac/zmii.c new file mode 100644 index 000000000..57a25c7a9 --- /dev/null +++ b/drivers/net/ethernet/ibm/emac/zmii.c @@ -0,0 +1,320 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * drivers/net/ethernet/ibm/emac/zmii.c + * + * Driver for PowerPC 4xx on-chip ethernet controller, ZMII bridge support. + * + * Copyright 2007 Benjamin Herrenschmidt, IBM Corp. + * <benh@kernel.crashing.org> + * + * Based on the arch/ppc version of the driver: + * + * Copyright (c) 2004, 2005 Zultys Technologies. + * Eugene Surovegin <eugene.surovegin@zultys.com> or <ebs@ebshome.net> + * + * Based on original work by + * Armin Kuster <akuster@mvista.com> + * Copyright 2001 MontaVista Softare Inc. + */ +#include <linux/slab.h> +#include <linux/kernel.h> +#include <linux/ethtool.h> +#include <linux/of_address.h> +#include <asm/io.h> + +#include "emac.h" +#include "core.h" + +/* ZMIIx_FER */ +#define ZMII_FER_MDI(idx) (0x80000000 >> ((idx) * 4)) +#define ZMII_FER_MDI_ALL (ZMII_FER_MDI(0) | ZMII_FER_MDI(1) | \ + ZMII_FER_MDI(2) | ZMII_FER_MDI(3)) + +#define ZMII_FER_SMII(idx) (0x40000000 >> ((idx) * 4)) +#define ZMII_FER_RMII(idx) (0x20000000 >> ((idx) * 4)) +#define ZMII_FER_MII(idx) (0x10000000 >> ((idx) * 4)) + +/* ZMIIx_SSR */ +#define ZMII_SSR_SCI(idx) (0x40000000 >> ((idx) * 4)) +#define ZMII_SSR_FSS(idx) (0x20000000 >> ((idx) * 4)) +#define ZMII_SSR_SP(idx) (0x10000000 >> ((idx) * 4)) + +/* ZMII only supports MII, RMII and SMII + * we also support autodetection for backward compatibility + */ +static inline int zmii_valid_mode(int mode) +{ + return mode == PHY_INTERFACE_MODE_MII || + mode == PHY_INTERFACE_MODE_RMII || + mode == PHY_INTERFACE_MODE_SMII || + mode == PHY_INTERFACE_MODE_NA; +} + +static inline const char *zmii_mode_name(int mode) +{ + switch (mode) { + case PHY_INTERFACE_MODE_MII: + return "MII"; + case PHY_INTERFACE_MODE_RMII: + return "RMII"; + case PHY_INTERFACE_MODE_SMII: + return "SMII"; + default: + BUG(); + } +} + +static inline u32 zmii_mode_mask(int mode, int input) +{ + switch (mode) { + case PHY_INTERFACE_MODE_MII: + return ZMII_FER_MII(input); + case PHY_INTERFACE_MODE_RMII: + return ZMII_FER_RMII(input); + case PHY_INTERFACE_MODE_SMII: + return ZMII_FER_SMII(input); + default: + return 0; + } +} + +int zmii_attach(struct platform_device *ofdev, int input, + phy_interface_t *mode) +{ + struct zmii_instance *dev = platform_get_drvdata(ofdev); + struct zmii_regs __iomem *p = dev->base; + + ZMII_DBG(dev, "init(%d, %d)" NL, input, *mode); + + if (!zmii_valid_mode(*mode)) { + /* Probably an EMAC connected to RGMII, + * but it still may need ZMII for MDIO so + * we don't fail here. + */ + dev->users++; + return 0; + } + + mutex_lock(&dev->lock); + + /* Autodetect ZMII mode if not specified. + * This is only for backward compatibility with the old driver. + * Please, always specify PHY mode in your board port to avoid + * any surprises. + */ + if (dev->mode == PHY_INTERFACE_MODE_NA) { + if (*mode == PHY_INTERFACE_MODE_NA) { + u32 r = dev->fer_save; + + ZMII_DBG(dev, "autodetecting mode, FER = 0x%08x" NL, r); + + if (r & (ZMII_FER_MII(0) | ZMII_FER_MII(1))) + dev->mode = PHY_INTERFACE_MODE_MII; + else if (r & (ZMII_FER_RMII(0) | ZMII_FER_RMII(1))) + dev->mode = PHY_INTERFACE_MODE_RMII; + else + dev->mode = PHY_INTERFACE_MODE_SMII; + } else { + dev->mode = *mode; + } + printk(KERN_NOTICE "%pOF: bridge in %s mode\n", + ofdev->dev.of_node, + zmii_mode_name(dev->mode)); + } else { + /* All inputs must use the same mode */ + if (*mode != PHY_INTERFACE_MODE_NA && *mode != dev->mode) { + printk(KERN_ERR + "%pOF: invalid mode %d specified for input %d\n", + ofdev->dev.of_node, *mode, input); + mutex_unlock(&dev->lock); + return -EINVAL; + } + } + + /* Report back correct PHY mode, + * it may be used during PHY initialization. + */ + *mode = dev->mode; + + /* Enable this input */ + out_be32(&p->fer, in_be32(&p->fer) | zmii_mode_mask(dev->mode, input)); + ++dev->users; + + mutex_unlock(&dev->lock); + + return 0; +} + +void zmii_get_mdio(struct platform_device *ofdev, int input) +{ + struct zmii_instance *dev = platform_get_drvdata(ofdev); + u32 fer; + + ZMII_DBG2(dev, "get_mdio(%d)" NL, input); + + mutex_lock(&dev->lock); + + fer = in_be32(&dev->base->fer) & ~ZMII_FER_MDI_ALL; + out_be32(&dev->base->fer, fer | ZMII_FER_MDI(input)); +} + +void zmii_put_mdio(struct platform_device *ofdev, int input) +{ + struct zmii_instance *dev = platform_get_drvdata(ofdev); + + ZMII_DBG2(dev, "put_mdio(%d)" NL, input); + mutex_unlock(&dev->lock); +} + + +void zmii_set_speed(struct platform_device *ofdev, int input, int speed) +{ + struct zmii_instance *dev = platform_get_drvdata(ofdev); + u32 ssr; + + mutex_lock(&dev->lock); + + ssr = in_be32(&dev->base->ssr); + + ZMII_DBG(dev, "speed(%d, %d)" NL, input, speed); + + if (speed == SPEED_100) + ssr |= ZMII_SSR_SP(input); + else + ssr &= ~ZMII_SSR_SP(input); + + out_be32(&dev->base->ssr, ssr); + + mutex_unlock(&dev->lock); +} + +void zmii_detach(struct platform_device *ofdev, int input) +{ + struct zmii_instance *dev = platform_get_drvdata(ofdev); + + BUG_ON(!dev || dev->users == 0); + + mutex_lock(&dev->lock); + + ZMII_DBG(dev, "detach(%d)" NL, input); + + /* Disable this input */ + out_be32(&dev->base->fer, + in_be32(&dev->base->fer) & ~zmii_mode_mask(dev->mode, input)); + + --dev->users; + + mutex_unlock(&dev->lock); +} + +int zmii_get_regs_len(struct platform_device *ofdev) +{ + return sizeof(struct emac_ethtool_regs_subhdr) + + sizeof(struct zmii_regs); +} + +void *zmii_dump_regs(struct platform_device *ofdev, void *buf) +{ + struct zmii_instance *dev = platform_get_drvdata(ofdev); + struct emac_ethtool_regs_subhdr *hdr = buf; + struct zmii_regs *regs = (struct zmii_regs *)(hdr + 1); + + hdr->version = 0; + hdr->index = 0; /* for now, are there chips with more than one + * zmii ? if yes, then we'll add a cell_index + * like we do for emac + */ + memcpy_fromio(regs, dev->base, sizeof(struct zmii_regs)); + return regs + 1; +} + +static int zmii_probe(struct platform_device *ofdev) +{ + struct device_node *np = ofdev->dev.of_node; + struct zmii_instance *dev; + struct resource regs; + int rc; + + rc = -ENOMEM; + dev = kzalloc(sizeof(struct zmii_instance), GFP_KERNEL); + if (dev == NULL) + goto err_gone; + + mutex_init(&dev->lock); + dev->ofdev = ofdev; + dev->mode = PHY_INTERFACE_MODE_NA; + + rc = -ENXIO; + if (of_address_to_resource(np, 0, ®s)) { + printk(KERN_ERR "%pOF: Can't get registers address\n", np); + goto err_free; + } + + rc = -ENOMEM; + dev->base = (struct zmii_regs __iomem *)ioremap(regs.start, + sizeof(struct zmii_regs)); + if (dev->base == NULL) { + printk(KERN_ERR "%pOF: Can't map device registers!\n", np); + goto err_free; + } + + /* We may need FER value for autodetection later */ + dev->fer_save = in_be32(&dev->base->fer); + + /* Disable all inputs by default */ + out_be32(&dev->base->fer, 0); + + printk(KERN_INFO "ZMII %pOF initialized\n", ofdev->dev.of_node); + wmb(); + platform_set_drvdata(ofdev, dev); + + return 0; + + err_free: + kfree(dev); + err_gone: + return rc; +} + +static int zmii_remove(struct platform_device *ofdev) +{ + struct zmii_instance *dev = platform_get_drvdata(ofdev); + + WARN_ON(dev->users != 0); + + iounmap(dev->base); + kfree(dev); + + return 0; +} + +static const struct of_device_id zmii_match[] = +{ + { + .compatible = "ibm,zmii", + }, + /* For backward compat with old DT */ + { + .type = "emac-zmii", + }, + {}, +}; + +static struct platform_driver zmii_driver = { + .driver = { + .name = "emac-zmii", + .of_match_table = zmii_match, + }, + .probe = zmii_probe, + .remove = zmii_remove, +}; + +int __init zmii_init(void) +{ + return platform_driver_register(&zmii_driver); +} + +void zmii_exit(void) +{ + platform_driver_unregister(&zmii_driver); +} |