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net: cpsw: Add a minimal cpsw-common module for shared code

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Looks like davinci_emac and cpsw can share some code although the
device registers have a different layout.

At least the code for getting the MAC address using syscon can
be shared by passing the register offset. Let's start with that
and set up a minimal shared cpsw-shared.c.

Cc: Brian Hutchinson <b.hutchman@gmail.com>
Cc: Felipe Balbi <balbi@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Tony Lindgren
2015-01-28 11:33:04 -08:00
committed by David S. Miller
parent 4c72c53be5
commit e5a49c1e3b
4 changed files with 60 additions and 33 deletions
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53
drivers/net/ethernet/ti/cpsw-common.c Normal file
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/*
* 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.
*
* 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/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/regmap.h>
#include <linux/mfd/syscon.h>
#define AM33XX_CTRL_MAC_LO_REG(offset, id) ((offset) + 0x8 * (id))
#define AM33XX_CTRL_MAC_HI_REG(offset, id) ((offset) + 0x8 * (id) + 0x4)
int cpsw_am33xx_cm_get_macid(struct device *dev, u16 offset, int slave,
u8 *mac_addr)
{
u32 macid_lo;
u32 macid_hi;
struct regmap *syscon;
syscon = syscon_regmap_lookup_by_phandle(dev->of_node, "syscon");
if (IS_ERR(syscon)) {
if (PTR_ERR(syscon) == -ENODEV)
return 0;
return PTR_ERR(syscon);
}
regmap_read(syscon, AM33XX_CTRL_MAC_LO_REG(offset, slave),
&macid_lo);
regmap_read(syscon, AM33XX_CTRL_MAC_HI_REG(offset, slave),
&macid_hi);
mac_addr[5] = (macid_lo >> 8) & 0xff;
mac_addr[4] = macid_lo & 0xff;
mac_addr[3] = (macid_hi >> 24) & 0xff;
mac_addr[2] = (macid_hi >> 16) & 0xff;
mac_addr[1] = (macid_hi >> 8) & 0xff;
mac_addr[0] = macid_hi & 0xff;
return 0;
}
EXPORT_SYMBOL_GPL(cpsw_am33xx_cm_get_macid);
MODULE_LICENSE("GPL");