Merge branch 'bugfixes' of git://git.linux-nfs.org/projects/trondmy/nfs-2.6
[pandora-kernel.git] / drivers / mmc / host / sdhci-of-esdhc.c
1 /*
2  * Freescale eSDHC controller driver.
3  *
4  * Copyright (c) 2007 Freescale Semiconductor, Inc.
5  * Copyright (c) 2009 MontaVista Software, Inc.
6  *
7  * Authors: Xiaobo Xie <X.Xie@freescale.com>
8  *          Anton Vorontsov <avorontsov@ru.mvista.com>
9  *
10  * This program is free software; you can redistribute it and/or modify
11  * it under the terms of the GNU General Public License as published by
12  * the Free Software Foundation; either version 2 of the License, or (at
13  * your option) any later version.
14  */
15
16 #include <linux/io.h>
17 #include <linux/delay.h>
18 #include <linux/mmc/host.h>
19 #include "sdhci-of.h"
20 #include "sdhci.h"
21 #include "sdhci-esdhc.h"
22
23 static u16 esdhc_readw(struct sdhci_host *host, int reg)
24 {
25         u16 ret;
26
27         if (unlikely(reg == SDHCI_HOST_VERSION))
28                 ret = in_be16(host->ioaddr + reg);
29         else
30                 ret = sdhci_be32bs_readw(host, reg);
31         return ret;
32 }
33
34 static void esdhc_writew(struct sdhci_host *host, u16 val, int reg)
35 {
36         if (reg == SDHCI_BLOCK_SIZE) {
37                 /*
38                  * Two last DMA bits are reserved, and first one is used for
39                  * non-standard blksz of 4096 bytes that we don't support
40                  * yet. So clear the DMA boundary bits.
41                  */
42                 val &= ~SDHCI_MAKE_BLKSZ(0x7, 0);
43         }
44         sdhci_be32bs_writew(host, val, reg);
45 }
46
47 static void esdhc_writeb(struct sdhci_host *host, u8 val, int reg)
48 {
49         /* Prevent SDHCI core from writing reserved bits (e.g. HISPD). */
50         if (reg == SDHCI_HOST_CONTROL)
51                 val &= ~ESDHC_HOST_CONTROL_RES;
52         sdhci_be32bs_writeb(host, val, reg);
53 }
54
55 static int esdhc_of_enable_dma(struct sdhci_host *host)
56 {
57         setbits32(host->ioaddr + ESDHC_DMA_SYSCTL, ESDHC_DMA_SNOOP);
58         return 0;
59 }
60
61 static unsigned int esdhc_of_get_max_clock(struct sdhci_host *host)
62 {
63         struct sdhci_of_host *of_host = sdhci_priv(host);
64
65         return of_host->clock;
66 }
67
68 static unsigned int esdhc_of_get_min_clock(struct sdhci_host *host)
69 {
70         struct sdhci_of_host *of_host = sdhci_priv(host);
71
72         return of_host->clock / 256 / 16;
73 }
74
75 struct sdhci_of_data sdhci_esdhc = {
76         .quirks = ESDHC_DEFAULT_QUIRKS,
77         .ops = {
78                 .read_l = sdhci_be32bs_readl,
79                 .read_w = esdhc_readw,
80                 .read_b = sdhci_be32bs_readb,
81                 .write_l = sdhci_be32bs_writel,
82                 .write_w = esdhc_writew,
83                 .write_b = esdhc_writeb,
84                 .set_clock = esdhc_set_clock,
85                 .enable_dma = esdhc_of_enable_dma,
86                 .get_max_clock = esdhc_of_get_max_clock,
87                 .get_min_clock = esdhc_of_get_min_clock,
88         },
89 };