2 * Atheros AR71xx built-in ethernet mac driver
4 * Copyright (C) 2008-2010 Gabor Juhos <juhosg@openwrt.org>
5 * Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
7 * Based on Atheros' AG7100 driver
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License version 2 as published
11 * by the Free Software Foundation.
16 #define AG71XX_MDIO_RETRY 1000
17 #define AG71XX_MDIO_DELAY 5
19 static inline void ag71xx_mdio_wr(struct ag71xx_mdio
*am
, unsigned reg
,
24 r
= am
->mdio_base
+ reg
;
25 __raw_writel(value
, r
);
28 (void) __raw_readl(r
);
31 static inline u32
ag71xx_mdio_rr(struct ag71xx_mdio
*am
, unsigned reg
)
33 return __raw_readl(am
->mdio_base
+ reg
);
36 static void ag71xx_mdio_dump_regs(struct ag71xx_mdio
*am
)
38 DBG("%s: mii_cfg=%08x, mii_cmd=%08x, mii_addr=%08x\n",
40 ag71xx_mdio_rr(am
, AG71XX_REG_MII_CFG
),
41 ag71xx_mdio_rr(am
, AG71XX_REG_MII_CMD
),
42 ag71xx_mdio_rr(am
, AG71XX_REG_MII_ADDR
));
43 DBG("%s: mii_ctrl=%08x, mii_status=%08x, mii_ind=%08x\n",
45 ag71xx_mdio_rr(am
, AG71XX_REG_MII_CTRL
),
46 ag71xx_mdio_rr(am
, AG71XX_REG_MII_STATUS
),
47 ag71xx_mdio_rr(am
, AG71XX_REG_MII_IND
));
50 static int ag71xx_mdio_wait_busy(struct ag71xx_mdio
*am
)
54 for (i
= 0; i
< AG71XX_MDIO_RETRY
; i
++) {
57 udelay(AG71XX_MDIO_DELAY
);
59 busy
= ag71xx_mdio_rr(am
, AG71XX_REG_MII_IND
);
63 udelay(AG71XX_MDIO_DELAY
);
66 pr_err("%s: MDIO operation timed out\n", am
->mii_bus
->name
);
71 int ag71xx_mdio_mii_read(struct ag71xx_mdio
*am
, int addr
, int reg
)
76 err
= ag71xx_mdio_wait_busy(am
);
80 ag71xx_mdio_wr(am
, AG71XX_REG_MII_CMD
, MII_CMD_WRITE
);
81 ag71xx_mdio_wr(am
, AG71XX_REG_MII_ADDR
,
82 ((addr
& 0xff) << MII_ADDR_SHIFT
) | (reg
& 0xff));
83 ag71xx_mdio_wr(am
, AG71XX_REG_MII_CMD
, MII_CMD_READ
);
85 err
= ag71xx_mdio_wait_busy(am
);
89 ret
= ag71xx_mdio_rr(am
, AG71XX_REG_MII_STATUS
) & 0xffff;
90 ag71xx_mdio_wr(am
, AG71XX_REG_MII_CMD
, MII_CMD_WRITE
);
92 DBG("mii_read: addr=%04x, reg=%04x, value=%04x\n", addr
, reg
, ret
);
97 void ag71xx_mdio_mii_write(struct ag71xx_mdio
*am
, int addr
, int reg
, u16 val
)
99 DBG("mii_write: addr=%04x, reg=%04x, value=%04x\n", addr
, reg
, val
);
101 ag71xx_mdio_wr(am
, AG71XX_REG_MII_ADDR
,
102 ((addr
& 0xff) << MII_ADDR_SHIFT
) | (reg
& 0xff));
103 ag71xx_mdio_wr(am
, AG71XX_REG_MII_CTRL
, val
);
105 ag71xx_mdio_wait_busy(am
);
108 static const u32 ar71xx_mdio_div_table
[] = {
109 4, 4, 6, 8, 10, 14, 20, 28,
112 static const u32 ar7240_mdio_div_table
[] = {
113 2, 2, 4, 6, 8, 12, 18, 26, 32, 40, 48, 56, 62, 70, 78, 96,
116 static const u32 ar933x_mdio_div_table
[] = {
117 4, 4, 6, 8, 10, 14, 20, 28, 34, 42, 50, 58, 66, 74, 82, 98,
120 static int ag71xx_mdio_get_divider(struct ag71xx_mdio
*am
, u32
*div
)
122 unsigned long ref_clock
, mdio_clock
;
127 ref_clock
= am
->pdata
->ref_clock
;
128 mdio_clock
= am
->pdata
->mdio_clock
;
130 if (!ref_clock
|| !mdio_clock
)
133 if (am
->pdata
->is_ar9330
|| am
->pdata
->is_ar934x
) {
134 table
= ar933x_mdio_div_table
;
135 ndivs
= ARRAY_SIZE(ar933x_mdio_div_table
);
136 } else if (am
->pdata
->is_ar7240
) {
137 table
= ar7240_mdio_div_table
;
138 ndivs
= ARRAY_SIZE(ar7240_mdio_div_table
);
140 table
= ar71xx_mdio_div_table
;
141 ndivs
= ARRAY_SIZE(ar71xx_mdio_div_table
);
144 for (i
= 0; i
< ndivs
; i
++) {
147 t
= ref_clock
/ table
[i
];
148 if (t
<= mdio_clock
) {
154 dev_err(&am
->mii_bus
->dev
, "no divider found for %lu/%lu\n",
155 ref_clock
, mdio_clock
);
159 static int ag71xx_mdio_reset(struct mii_bus
*bus
)
161 struct ag71xx_mdio
*am
= bus
->priv
;
165 err
= ag71xx_mdio_get_divider(am
, &t
);
168 if (am
->pdata
->is_ar7240
)
169 t
= MII_CFG_CLK_DIV_6
;
170 else if (am
->pdata
->builtin_switch
&& !am
->pdata
->is_ar934x
)
171 t
= MII_CFG_CLK_DIV_10
;
172 else if (!am
->pdata
->builtin_switch
&& am
->pdata
->is_ar934x
)
173 t
= MII_CFG_CLK_DIV_58
;
175 t
= MII_CFG_CLK_DIV_28
;
178 ag71xx_mdio_wr(am
, AG71XX_REG_MII_CFG
, t
| MII_CFG_RESET
);
181 ag71xx_mdio_wr(am
, AG71XX_REG_MII_CFG
, t
);
184 if (am
->pdata
->reset
)
185 am
->pdata
->reset(bus
);
190 static int ag71xx_mdio_read(struct mii_bus
*bus
, int addr
, int reg
)
192 struct ag71xx_mdio
*am
= bus
->priv
;
194 if (am
->pdata
->builtin_switch
)
195 return ar7240sw_phy_read(bus
, addr
, reg
);
197 return ag71xx_mdio_mii_read(am
, addr
, reg
);
200 static int ag71xx_mdio_write(struct mii_bus
*bus
, int addr
, int reg
, u16 val
)
202 struct ag71xx_mdio
*am
= bus
->priv
;
204 if (am
->pdata
->builtin_switch
)
205 ar7240sw_phy_write(bus
, addr
, reg
, val
);
207 ag71xx_mdio_mii_write(am
, addr
, reg
, val
);
211 static int ag71xx_mdio_probe(struct platform_device
*pdev
)
213 struct ag71xx_mdio_platform_data
*pdata
;
214 struct ag71xx_mdio
*am
;
215 struct resource
*res
;
219 pdata
= pdev
->dev
.platform_data
;
221 dev_err(&pdev
->dev
, "no platform data specified\n");
225 am
= kzalloc(sizeof(*am
), GFP_KERNEL
);
233 res
= platform_get_resource(pdev
, IORESOURCE_MEM
, 0);
235 dev_err(&pdev
->dev
, "no iomem resource found\n");
240 am
->mdio_base
= ioremap_nocache(res
->start
, res
->end
- res
->start
+ 1);
241 if (!am
->mdio_base
) {
242 dev_err(&pdev
->dev
, "unable to ioremap registers\n");
247 am
->mii_bus
= mdiobus_alloc();
248 if (am
->mii_bus
== NULL
) {
253 am
->mii_bus
->name
= "ag71xx_mdio";
254 am
->mii_bus
->read
= ag71xx_mdio_read
;
255 am
->mii_bus
->write
= ag71xx_mdio_write
;
256 am
->mii_bus
->reset
= ag71xx_mdio_reset
;
257 am
->mii_bus
->irq
= am
->mii_irq
;
258 am
->mii_bus
->priv
= am
;
259 am
->mii_bus
->parent
= &pdev
->dev
;
260 snprintf(am
->mii_bus
->id
, MII_BUS_ID_SIZE
, "%s", dev_name(&pdev
->dev
));
261 am
->mii_bus
->phy_mask
= pdata
->phy_mask
;
263 for (i
= 0; i
< PHY_MAX_ADDR
; i
++)
264 am
->mii_irq
[i
] = PHY_POLL
;
266 ag71xx_mdio_wr(am
, AG71XX_REG_MAC_CFG1
, 0);
268 err
= mdiobus_register(am
->mii_bus
);
272 ag71xx_mdio_dump_regs(am
);
274 platform_set_drvdata(pdev
, am
);
278 mdiobus_free(am
->mii_bus
);
280 iounmap(am
->mdio_base
);
287 static int ag71xx_mdio_remove(struct platform_device
*pdev
)
289 struct ag71xx_mdio
*am
= platform_get_drvdata(pdev
);
292 mdiobus_unregister(am
->mii_bus
);
293 mdiobus_free(am
->mii_bus
);
294 iounmap(am
->mdio_base
);
296 platform_set_drvdata(pdev
, NULL
);
302 static struct platform_driver ag71xx_mdio_driver
= {
303 .probe
= ag71xx_mdio_probe
,
304 .remove
= ag71xx_mdio_remove
,
306 .name
= "ag71xx-mdio",
310 int __init
ag71xx_mdio_driver_init(void)
312 return platform_driver_register(&ag71xx_mdio_driver
);
315 void ag71xx_mdio_driver_exit(void)
317 platform_driver_unregister(&ag71xx_mdio_driver
);