1 /*
2  * Broadcom specific AMBA
3  * ChipCommon B Unit driver
4  *
5  * Copyright 2014, Hauke Mehrtens <hauke@hauke-m.de>
6  *
7  * Licensed under the GNU/GPL. See COPYING for details.
8  */
9 
10 #include "bcma_private.h"
11 #include <linux/export.h>
12 #include <linux/bcma/bcma.h>
13 
14 static bool bcma_wait_reg(struct bcma_bus *bus, void __iomem *addr, u32 mask,
15 			  u32 value, int timeout)
16 {
17 	unsigned long deadline = jiffies + timeout;
18 	u32 val;
19 
20 	do {
21 		val = readl(addr);
22 		if ((val & mask) == value)
23 			return true;
24 		cpu_relax();
25 		udelay(10);
26 	} while (!time_after_eq(jiffies, deadline));
27 
28 	bcma_err(bus, "Timeout waiting for register %p\n", addr);
29 
30 	return false;
31 }
32 
33 void bcma_chipco_b_mii_write(struct bcma_drv_cc_b *ccb, u32 offset, u32 value)
34 {
35 	struct bcma_bus *bus = ccb->core->bus;
36 	void __iomem *mii = ccb->mii;
37 
38 	writel(offset, mii + BCMA_CCB_MII_MNG_CTL);
39 	bcma_wait_reg(bus, mii + BCMA_CCB_MII_MNG_CTL, 0x0100, 0x0000, 100);
40 	writel(value, mii + BCMA_CCB_MII_MNG_CMD_DATA);
41 	bcma_wait_reg(bus, mii + BCMA_CCB_MII_MNG_CTL, 0x0100, 0x0000, 100);
42 }
43 EXPORT_SYMBOL_GPL(bcma_chipco_b_mii_write);
44 
45 int bcma_core_chipcommon_b_init(struct bcma_drv_cc_b *ccb)
46 {
47 	if (ccb->setup_done)
48 		return 0;
49 
50 	ccb->setup_done = 1;
51 	ccb->mii = ioremap_nocache(ccb->core->addr_s[1], BCMA_CORE_SIZE);
52 	if (!ccb->mii)
53 		return -ENOMEM;
54 
55 	return 0;
56 }
57 
58 void bcma_core_chipcommon_b_free(struct bcma_drv_cc_b *ccb)
59 {
60 	if (ccb->mii)
61 		iounmap(ccb->mii);
62 }
63