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 	/* card detection could be handled via GPIO */
77 	.quirks = ESDHC_DEFAULT_QUIRKS | SDHCI_QUIRK_BROKEN_CARD_DETECTION
78 		| SDHCI_QUIRK_NO_CARD_NO_RESET,
79 	.ops = {
80 		.read_l = sdhci_be32bs_readl,
81 		.read_w = esdhc_readw,
82 		.read_b = sdhci_be32bs_readb,
83 		.write_l = sdhci_be32bs_writel,
84 		.write_w = esdhc_writew,
85 		.write_b = esdhc_writeb,
86 		.set_clock = esdhc_set_clock,
87 		.enable_dma = esdhc_of_enable_dma,
88 		.get_max_clock = esdhc_of_get_max_clock,
89 		.get_min_clock = esdhc_of_get_min_clock,
90 	},
91 };
92