cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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cpsw-common.c (2662B)

      1// SPDX-License-Identifier: GPL-2.0+
      2
      3#include <linux/kernel.h>
      4#include <linux/module.h>
      5#include <linux/of.h>
      6#include <linux/of_device.h>
      7#include <linux/regmap.h>
      8#include <linux/mfd/syscon.h>
      9
     10#include "cpsw.h"
     11
     12#define CTRL_MAC_LO_REG(offset, id) ((offset) + 0x8 * (id))
     13#define CTRL_MAC_HI_REG(offset, id) ((offset) + 0x8 * (id) + 0x4)
     14
     15static int davinci_emac_3517_get_macid(struct device *dev, u16 offset,
     16				       int slave, u8 *mac_addr)
     17{
     18	u32 macid_lsb;
     19	u32 macid_msb;
     20	struct regmap *syscon;
     21
     22	syscon = syscon_regmap_lookup_by_phandle(dev->of_node, "syscon");
     23	if (IS_ERR(syscon)) {
     24		if (PTR_ERR(syscon) == -ENODEV)
     25			return 0;
     26		return PTR_ERR(syscon);
     27	}
     28
     29	regmap_read(syscon, CTRL_MAC_LO_REG(offset, slave), &macid_lsb);
     30	regmap_read(syscon, CTRL_MAC_HI_REG(offset, slave), &macid_msb);
     31
     32	mac_addr[0] = (macid_msb >> 16) & 0xff;
     33	mac_addr[1] = (macid_msb >> 8)  & 0xff;
     34	mac_addr[2] = macid_msb & 0xff;
     35	mac_addr[3] = (macid_lsb >> 16) & 0xff;
     36	mac_addr[4] = (macid_lsb >> 8)  & 0xff;
     37	mac_addr[5] = macid_lsb & 0xff;
     38
     39	return 0;
     40}
     41
     42static int cpsw_am33xx_cm_get_macid(struct device *dev, u16 offset, int slave,
     43				    u8 *mac_addr)
     44{
     45	u32 macid_lo;
     46	u32 macid_hi;
     47	struct regmap *syscon;
     48
     49	syscon = syscon_regmap_lookup_by_phandle(dev->of_node, "syscon");
     50	if (IS_ERR(syscon)) {
     51		if (PTR_ERR(syscon) == -ENODEV)
     52			return 0;
     53		return PTR_ERR(syscon);
     54	}
     55
     56	regmap_read(syscon, CTRL_MAC_LO_REG(offset, slave), &macid_lo);
     57	regmap_read(syscon, CTRL_MAC_HI_REG(offset, slave), &macid_hi);
     58
     59	mac_addr[5] = (macid_lo >> 8) & 0xff;
     60	mac_addr[4] = macid_lo & 0xff;
     61	mac_addr[3] = (macid_hi >> 24) & 0xff;
     62	mac_addr[2] = (macid_hi >> 16) & 0xff;
     63	mac_addr[1] = (macid_hi >> 8) & 0xff;
     64	mac_addr[0] = macid_hi & 0xff;
     65
     66	return 0;
     67}
     68
     69int ti_cm_get_macid(struct device *dev, int slave, u8 *mac_addr)
     70{
     71	if (of_machine_is_compatible("ti,dm8148"))
     72		return cpsw_am33xx_cm_get_macid(dev, 0x630, slave, mac_addr);
     73
     74	if (of_machine_is_compatible("ti,am33xx"))
     75		return cpsw_am33xx_cm_get_macid(dev, 0x630, slave, mac_addr);
     76
     77	if (of_device_is_compatible(dev->of_node, "ti,am3517-emac"))
     78		return davinci_emac_3517_get_macid(dev, 0x110, slave, mac_addr);
     79
     80	if (of_device_is_compatible(dev->of_node, "ti,dm816-emac"))
     81		return cpsw_am33xx_cm_get_macid(dev, 0x30, slave, mac_addr);
     82
     83	if (of_machine_is_compatible("ti,am43"))
     84		return cpsw_am33xx_cm_get_macid(dev, 0x630, slave, mac_addr);
     85
     86	if (of_machine_is_compatible("ti,dra7"))
     87		return davinci_emac_3517_get_macid(dev, 0x514, slave, mac_addr);
     88
     89	dev_info(dev, "incompatible machine/device type for reading mac address\n");
     90	return -ENOENT;
     91}
     92EXPORT_SYMBOL_GPL(ti_cm_get_macid);
     93
     94MODULE_LICENSE("GPL");