Merge branch 'master' into csb1725

[mv-sheeva.git] / drivers / mmc / host / sdhci-esdhc.h

diff --git a/drivers/mmc/host/sdhci-esdhc.h b/drivers/mmc/host/sdhci-esdhc.h
new file mode 100644 (file)
index 0000000..afaf1bc
--- /dev/null
+++ b/drivers/mmc/host/sdhci-esdhc.h
@@ -0,0 +1,83 @@
+/*
+ * Freescale eSDHC controller driver generics for OF and pltfm.
+ *
+ * Copyright (c) 2007 Freescale Semiconductor, Inc.
+ * Copyright (c) 2009 MontaVista Software, Inc.
+ * Copyright (c) 2010 Pengutronix e.K.
+ *   Author: Wolfram Sang <w.sang@pengutronix.de>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License.
+ */
+
+#ifndef _DRIVERS_MMC_SDHCI_ESDHC_H
+#define _DRIVERS_MMC_SDHCI_ESDHC_H
+
+/*
+ * Ops and quirks for the Freescale eSDHC controller.
+ */
+
+#define ESDHC_DEFAULT_QUIRKS   (SDHCI_QUIRK_FORCE_BLK_SZ_2048 | \
+                               SDHCI_QUIRK_BROKEN_CARD_DETECTION | \
+                               SDHCI_QUIRK_NO_BUSY_IRQ | \
+                               SDHCI_QUIRK_NONSTANDARD_CLOCK | \
+                               SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK | \
+                               SDHCI_QUIRK_PIO_NEEDS_DELAY | \
+                               SDHCI_QUIRK_RESTORE_IRQS_AFTER_RESET | \
+                               SDHCI_QUIRK_NO_CARD_NO_RESET)
+
+#define ESDHC_SYSTEM_CONTROL   0x2c
+#define ESDHC_CLOCK_MASK       0x0000fff0
+#define ESDHC_PREDIV_SHIFT     8
+#define ESDHC_DIVIDER_SHIFT    4
+#define ESDHC_CLOCK_PEREN      0x00000004
+#define ESDHC_CLOCK_HCKEN      0x00000002
+#define ESDHC_CLOCK_IPGEN      0x00000001
+
+/* pltfm-specific */
+#define ESDHC_HOST_CONTROL_LE  0x20
+
+/* OF-specific */
+#define ESDHC_DMA_SYSCTL       0x40c
+#define ESDHC_DMA_SNOOP                0x00000040
+
+#define ESDHC_HOST_CONTROL_RES 0x05
+
+static inline void esdhc_set_clock(struct sdhci_host *host, unsigned int clock)
+{
+       int pre_div = 2;
+       int div = 1;
+       u32 temp;
+
+       temp = sdhci_readl(host, ESDHC_SYSTEM_CONTROL);
+       temp &= ~(ESDHC_CLOCK_IPGEN | ESDHC_CLOCK_HCKEN | ESDHC_CLOCK_PEREN
+               | ESDHC_CLOCK_MASK);
+       sdhci_writel(host, temp, ESDHC_SYSTEM_CONTROL);
+
+       if (clock == 0)
+               goto out;
+
+       while (host->max_clk / pre_div / 16 > clock && pre_div < 256)
+               pre_div *= 2;
+
+       while (host->max_clk / pre_div / div > clock && div < 16)
+               div++;
+
+       dev_dbg(mmc_dev(host->mmc), "desired SD clock: %d, actual: %d\n",
+               clock, host->max_clk / pre_div / div);
+
+       pre_div >>= 1;
+       div--;
+
+       temp = sdhci_readl(host, ESDHC_SYSTEM_CONTROL);
+       temp |= (ESDHC_CLOCK_IPGEN | ESDHC_CLOCK_HCKEN | ESDHC_CLOCK_PEREN
+               | (div << ESDHC_DIVIDER_SHIFT)
+               | (pre_div << ESDHC_PREDIV_SHIFT));
+       sdhci_writel(host, temp, ESDHC_SYSTEM_CONTROL);
+       mdelay(100);
+out:
+       host->clock = clock;
+}
+
+#endif /* _DRIVERS_MMC_SDHCI_ESDHC_H */