diff options
Diffstat (limited to 'drivers/net/phy/mdio-mux-mmioreg.c')
| -rw-r--r-- | drivers/net/phy/mdio-mux-mmioreg.c | 204 |
1 files changed, 0 insertions, 204 deletions
diff --git a/drivers/net/phy/mdio-mux-mmioreg.c b/drivers/net/phy/mdio-mux-mmioreg.c deleted file mode 100644 index d1a8780e24d8..000000000000 --- a/drivers/net/phy/mdio-mux-mmioreg.c +++ /dev/null @@ -1,204 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* - * Simple memory-mapped device MDIO MUX driver - * - * Author: Timur Tabi <timur@freescale.com> - * - * Copyright 2012 Freescale Semiconductor, Inc. - */ - -#include <linux/platform_device.h> -#include <linux/device.h> -#include <linux/of_address.h> -#include <linux/of_mdio.h> -#include <linux/module.h> -#include <linux/phy.h> -#include <linux/mdio-mux.h> - -struct mdio_mux_mmioreg_state { - void *mux_handle; - phys_addr_t phys; - unsigned int iosize; - unsigned int mask; -}; - -/* - * MDIO multiplexing switch function - * - * This function is called by the mdio-mux layer when it thinks the mdio bus - * multiplexer needs to switch. - * - * 'current_child' is the current value of the mux register (masked via - * s->mask). - * - * 'desired_child' is the value of the 'reg' property of the target child MDIO - * node. - * - * The first time this function is called, current_child == -1. - * - * If current_child == desired_child, then the mux is already set to the - * correct bus. - */ -static int mdio_mux_mmioreg_switch_fn(int current_child, int desired_child, - void *data) -{ - struct mdio_mux_mmioreg_state *s = data; - - if (current_child ^ desired_child) { - void __iomem *p = ioremap(s->phys, s->iosize); - if (!p) - return -ENOMEM; - - switch (s->iosize) { - case sizeof(uint8_t): { - uint8_t x, y; - - x = ioread8(p); - y = (x & ~s->mask) | desired_child; - if (x != y) { - iowrite8((x & ~s->mask) | desired_child, p); - pr_debug("%s: %02x -> %02x\n", __func__, x, y); - } - - break; - } - case sizeof(uint16_t): { - uint16_t x, y; - - x = ioread16(p); - y = (x & ~s->mask) | desired_child; - if (x != y) { - iowrite16((x & ~s->mask) | desired_child, p); - pr_debug("%s: %04x -> %04x\n", __func__, x, y); - } - - break; - } - case sizeof(uint32_t): { - uint32_t x, y; - - x = ioread32(p); - y = (x & ~s->mask) | desired_child; - if (x != y) { - iowrite32((x & ~s->mask) | desired_child, p); - pr_debug("%s: %08x -> %08x\n", __func__, x, y); - } - - break; - } - } - - iounmap(p); - } - - return 0; -} - -static int mdio_mux_mmioreg_probe(struct platform_device *pdev) -{ - struct device_node *np2, *np = pdev->dev.of_node; - struct mdio_mux_mmioreg_state *s; - struct resource res; - const __be32 *iprop; - int len, ret; - - dev_dbg(&pdev->dev, "probing node %pOF\n", np); - - s = devm_kzalloc(&pdev->dev, sizeof(*s), GFP_KERNEL); - if (!s) - return -ENOMEM; - - ret = of_address_to_resource(np, 0, &res); - if (ret) { - dev_err(&pdev->dev, "could not obtain memory map for node %pOF\n", - np); - return ret; - } - s->phys = res.start; - - s->iosize = resource_size(&res); - if (s->iosize != sizeof(uint8_t) && - s->iosize != sizeof(uint16_t) && - s->iosize != sizeof(uint32_t)) { - dev_err(&pdev->dev, "only 8/16/32-bit registers are supported\n"); - return -EINVAL; - } - - iprop = of_get_property(np, "mux-mask", &len); - if (!iprop || len != sizeof(uint32_t)) { - dev_err(&pdev->dev, "missing or invalid mux-mask property\n"); - return -ENODEV; - } - if (be32_to_cpup(iprop) >= BIT(s->iosize * 8)) { - dev_err(&pdev->dev, "only 8/16/32-bit registers are supported\n"); - return -EINVAL; - } - s->mask = be32_to_cpup(iprop); - - /* - * Verify that the 'reg' property of each child MDIO bus does not - * set any bits outside of the 'mask'. - */ - for_each_available_child_of_node(np, np2) { - iprop = of_get_property(np2, "reg", &len); - if (!iprop || len != sizeof(uint32_t)) { - dev_err(&pdev->dev, "mdio-mux child node %pOF is " - "missing a 'reg' property\n", np2); - of_node_put(np2); - return -ENODEV; - } - if (be32_to_cpup(iprop) & ~s->mask) { - dev_err(&pdev->dev, "mdio-mux child node %pOF has " - "a 'reg' value with unmasked bits\n", - np2); - of_node_put(np2); - return -ENODEV; - } - } - - ret = mdio_mux_init(&pdev->dev, pdev->dev.of_node, - mdio_mux_mmioreg_switch_fn, - &s->mux_handle, s, NULL); - if (ret) { - if (ret != -EPROBE_DEFER) - dev_err(&pdev->dev, - "failed to register mdio-mux bus %pOF\n", np); - return ret; - } - - pdev->dev.platform_data = s; - - return 0; -} - -static int mdio_mux_mmioreg_remove(struct platform_device *pdev) -{ - struct mdio_mux_mmioreg_state *s = dev_get_platdata(&pdev->dev); - - mdio_mux_uninit(s->mux_handle); - - return 0; -} - -static const struct of_device_id mdio_mux_mmioreg_match[] = { - { - .compatible = "mdio-mux-mmioreg", - }, - {}, -}; -MODULE_DEVICE_TABLE(of, mdio_mux_mmioreg_match); - -static struct platform_driver mdio_mux_mmioreg_driver = { - .driver = { - .name = "mdio-mux-mmioreg", - .of_match_table = mdio_mux_mmioreg_match, - }, - .probe = mdio_mux_mmioreg_probe, - .remove = mdio_mux_mmioreg_remove, -}; - -module_platform_driver(mdio_mux_mmioreg_driver); - -MODULE_AUTHOR("Timur Tabi <timur@freescale.com>"); -MODULE_DESCRIPTION("Memory-mapped device MDIO MUX driver"); -MODULE_LICENSE("GPL v2"); |