| Wolfram Sang | 80872e2 | 2010-10-15 12:21:03 +0200 | [diff] [blame] | 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 | |
| 47 | static 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); |
| 79 | out: |
| 80 | host->clock = clock; |
| 81 | } |
| 82 | |
| 83 | #endif /* _DRIVERS_MMC_SDHCI_ESDHC_H */ |