aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/mmc/host/sdhci-esdhc.h
diff options
context:
space:
mode:
authorWolfram Sang <w.sang@pengutronix.de>2010-10-15 06:21:03 -0400
committerChris Ball <cjb@laptop.org>2010-10-23 09:11:22 -0400
commit80872e21b0263f016f2edb7b72dd8be5636d7ca7 (patch)
treed20f4595f8e4dede60fbf14a6787ccbed1827eae /drivers/mmc/host/sdhci-esdhc.h
parent012994f4fa5fc7663b51fa921c85c0a352339b24 (diff)
mmc: sdhci-of-esdhc: factor out common stuff
Put everything which can be shared between the OF and platform version of this driver into a local .h file. Signed-off-by: Wolfram Sang <w.sang@pengutronix.de> Tested-by: Eric BĂ©nard <eric@eukrea.com> [cjb: fix compile error: sdhci-esdhc.c->sdhci-esdhc.h] Signed-off-by: Chris Ball <cjb@laptop.org>
Diffstat (limited to 'drivers/mmc/host/sdhci-esdhc.h')
-rw-r--r--drivers/mmc/host/sdhci-esdhc.h83
1 files changed, 83 insertions, 0 deletions
diff --git a/drivers/mmc/host/sdhci-esdhc.h b/drivers/mmc/host/sdhci-esdhc.h
new file mode 100644
index 000000000000..afaf1bc4913a
--- /dev/null
+++ b/drivers/mmc/host/sdhci-esdhc.h
@@ -0,0 +1,83 @@
1/*
2 * Freescale eSDHC controller driver generics for OF and pltfm.
3 *
4 * Copyright (c) 2007 Freescale Semiconductor, Inc.
5 * Copyright (c) 2009 MontaVista Software, Inc.
6 * Copyright (c) 2010 Pengutronix e.K.
7 * Author: Wolfram Sang <w.sang@pengutronix.de>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License.
12 */
13
14#ifndef _DRIVERS_MMC_SDHCI_ESDHC_H
15#define _DRIVERS_MMC_SDHCI_ESDHC_H
16
17/*
18 * Ops and quirks for the Freescale eSDHC controller.
19 */
20
21#define ESDHC_DEFAULT_QUIRKS (SDHCI_QUIRK_FORCE_BLK_SZ_2048 | \
22 SDHCI_QUIRK_BROKEN_CARD_DETECTION | \
23 SDHCI_QUIRK_NO_BUSY_IRQ | \
24 SDHCI_QUIRK_NONSTANDARD_CLOCK | \
25 SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK | \
26 SDHCI_QUIRK_PIO_NEEDS_DELAY | \
27 SDHCI_QUIRK_RESTORE_IRQS_AFTER_RESET | \
28 SDHCI_QUIRK_NO_CARD_NO_RESET)
29
30#define ESDHC_SYSTEM_CONTROL 0x2c
31#define ESDHC_CLOCK_MASK 0x0000fff0
32#define ESDHC_PREDIV_SHIFT 8
33#define ESDHC_DIVIDER_SHIFT 4
34#define ESDHC_CLOCK_PEREN 0x00000004
35#define ESDHC_CLOCK_HCKEN 0x00000002
36#define ESDHC_CLOCK_IPGEN 0x00000001
37
38/* pltfm-specific */
39#define ESDHC_HOST_CONTROL_LE 0x20
40
41/* OF-specific */
42#define ESDHC_DMA_SYSCTL 0x40c
43#define ESDHC_DMA_SNOOP 0x00000040
44
45#define ESDHC_HOST_CONTROL_RES 0x05
46
47static inline void esdhc_set_clock(struct sdhci_host *host, unsigned int clock)
48{
49 int pre_div = 2;
50 int div = 1;
51 u32 temp;
52
53 temp = sdhci_readl(host, ESDHC_SYSTEM_CONTROL);
54 temp &= ~(ESDHC_CLOCK_IPGEN | ESDHC_CLOCK_HCKEN | ESDHC_CLOCK_PEREN
55 | ESDHC_CLOCK_MASK);
56 sdhci_writel(host, temp, ESDHC_SYSTEM_CONTROL);
57
58 if (clock == 0)
59 goto out;
60
61 while (host->max_clk / pre_div / 16 > clock && pre_div < 256)
62 pre_div *= 2;
63
64 while (host->max_clk / pre_div / div > clock && div < 16)
65 div++;
66
67 dev_dbg(mmc_dev(host->mmc), "desired SD clock: %d, actual: %d\n",
68 clock, host->max_clk / pre_div / div);
69
70 pre_div >>= 1;
71 div--;
72
73 temp = sdhci_readl(host, ESDHC_SYSTEM_CONTROL);
74 temp |= (ESDHC_CLOCK_IPGEN | ESDHC_CLOCK_HCKEN | ESDHC_CLOCK_PEREN
75 | (div << ESDHC_DIVIDER_SHIFT)
76 | (pre_div << ESDHC_PREDIV_SHIFT));
77 sdhci_writel(host, temp, ESDHC_SYSTEM_CONTROL);
78 mdelay(100);
79out:
80 host->clock = clock;
81}
82
83#endif /* _DRIVERS_MMC_SDHCI_ESDHC_H */