1005 lines
24 KiB
C
1005 lines
24 KiB
C
/*
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* WM8505/WM8650 SD/MMC Host Controller
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*
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* Copyright (C) 2010 Tony Prisk
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* Copyright (C) 2008 WonderMedia Technologies, Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/ioport.h>
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#include <linux/errno.h>
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#include <linux/dma-mapping.h>
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#include <linux/delay.h>
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#include <linux/io.h>
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#include <linux/irq.h>
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#include <linux/clk.h>
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#include <linux/gpio.h>
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#include <linux/of.h>
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#include <linux/of_address.h>
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#include <linux/of_irq.h>
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#include <linux/of_device.h>
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#include <linux/mmc/host.h>
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#include <linux/mmc/mmc.h>
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#include <linux/mmc/sd.h>
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#include <asm/byteorder.h>
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#define DRIVER_NAME "wmt-sdhc"
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/* MMC/SD controller registers */
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#define SDMMC_CTLR 0x00
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#define SDMMC_CMD 0x01
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#define SDMMC_RSPTYPE 0x02
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#define SDMMC_ARG 0x04
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#define SDMMC_BUSMODE 0x08
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#define SDMMC_BLKLEN 0x0C
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#define SDMMC_BLKCNT 0x0E
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#define SDMMC_RSP 0x10
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#define SDMMC_CBCR 0x20
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#define SDMMC_INTMASK0 0x24
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#define SDMMC_INTMASK1 0x25
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#define SDMMC_STS0 0x28
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#define SDMMC_STS1 0x29
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#define SDMMC_STS2 0x2A
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#define SDMMC_STS3 0x2B
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#define SDMMC_RSPTIMEOUT 0x2C
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#define SDMMC_CLK 0x30 /* VT8500 only */
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#define SDMMC_EXTCTRL 0x34
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#define SDMMC_SBLKLEN 0x38
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#define SDMMC_DMATIMEOUT 0x3C
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/* SDMMC_CTLR bit fields */
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#define CTLR_CMD_START 0x01
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#define CTLR_CMD_WRITE 0x04
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#define CTLR_FIFO_RESET 0x08
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/* SDMMC_BUSMODE bit fields */
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#define BM_SPI_MODE 0x01
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#define BM_FOURBIT_MODE 0x02
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#define BM_EIGHTBIT_MODE 0x04
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#define BM_SD_OFF 0x10
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#define BM_SPI_CS 0x20
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#define BM_SD_POWER 0x40
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#define BM_SOFT_RESET 0x80
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/* SDMMC_BLKLEN bit fields */
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#define BLKL_CRCERR_ABORT 0x0800
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#define BLKL_CD_POL_HIGH 0x1000
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#define BLKL_GPI_CD 0x2000
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#define BLKL_DATA3_CD 0x4000
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#define BLKL_INT_ENABLE 0x8000
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/* SDMMC_INTMASK0 bit fields */
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#define INT0_MBLK_TRAN_DONE_INT_EN 0x10
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#define INT0_BLK_TRAN_DONE_INT_EN 0x20
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#define INT0_CD_INT_EN 0x40
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#define INT0_DI_INT_EN 0x80
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/* SDMMC_INTMASK1 bit fields */
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#define INT1_CMD_RES_TRAN_DONE_INT_EN 0x02
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#define INT1_CMD_RES_TOUT_INT_EN 0x04
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#define INT1_MBLK_AUTO_STOP_INT_EN 0x08
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#define INT1_DATA_TOUT_INT_EN 0x10
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#define INT1_RESCRC_ERR_INT_EN 0x20
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#define INT1_RCRC_ERR_INT_EN 0x40
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#define INT1_WCRC_ERR_INT_EN 0x80
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/* SDMMC_STS0 bit fields */
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#define STS0_WRITE_PROTECT 0x02
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#define STS0_CD_DATA3 0x04
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#define STS0_CD_GPI 0x08
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#define STS0_MBLK_DONE 0x10
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#define STS0_BLK_DONE 0x20
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#define STS0_CARD_DETECT 0x40
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#define STS0_DEVICE_INS 0x80
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/* SDMMC_STS1 bit fields */
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#define STS1_SDIO_INT 0x01
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#define STS1_CMDRSP_DONE 0x02
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#define STS1_RSP_TIMEOUT 0x04
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#define STS1_AUTOSTOP_DONE 0x08
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#define STS1_DATA_TIMEOUT 0x10
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#define STS1_RSP_CRC_ERR 0x20
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#define STS1_RCRC_ERR 0x40
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#define STS1_WCRC_ERR 0x80
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/* SDMMC_STS2 bit fields */
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#define STS2_CMD_RES_BUSY 0x10
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#define STS2_DATARSP_BUSY 0x20
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#define STS2_DIS_FORCECLK 0x80
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/* SDMMC_EXTCTRL bit fields */
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#define EXT_EIGHTBIT 0x04
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/* MMC/SD DMA Controller Registers */
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#define SDDMA_GCR 0x100
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#define SDDMA_IER 0x104
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#define SDDMA_ISR 0x108
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#define SDDMA_DESPR 0x10C
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#define SDDMA_RBR 0x110
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#define SDDMA_DAR 0x114
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#define SDDMA_BAR 0x118
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#define SDDMA_CPR 0x11C
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#define SDDMA_CCR 0x120
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/* SDDMA_GCR bit fields */
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#define DMA_GCR_DMA_EN 0x00000001
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#define DMA_GCR_SOFT_RESET 0x00000100
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/* SDDMA_IER bit fields */
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#define DMA_IER_INT_EN 0x00000001
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/* SDDMA_ISR bit fields */
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#define DMA_ISR_INT_STS 0x00000001
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/* SDDMA_RBR bit fields */
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#define DMA_RBR_FORMAT 0x40000000
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#define DMA_RBR_END 0x80000000
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/* SDDMA_CCR bit fields */
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#define DMA_CCR_RUN 0x00000080
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#define DMA_CCR_IF_TO_PERIPHERAL 0x00000000
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#define DMA_CCR_PERIPHERAL_TO_IF 0x00400000
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/* SDDMA_CCR event status */
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#define DMA_CCR_EVT_NO_STATUS 0x00000000
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#define DMA_CCR_EVT_UNDERRUN 0x00000001
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#define DMA_CCR_EVT_OVERRUN 0x00000002
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#define DMA_CCR_EVT_DESP_READ 0x00000003
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#define DMA_CCR_EVT_DATA_RW 0x00000004
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#define DMA_CCR_EVT_EARLY_END 0x00000005
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#define DMA_CCR_EVT_SUCCESS 0x0000000F
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#define PDMA_READ 0x00
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#define PDMA_WRITE 0x01
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#define WMT_SD_POWER_OFF 0
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#define WMT_SD_POWER_ON 1
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struct wmt_dma_descriptor {
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u32 flags;
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u32 data_buffer_addr;
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u32 branch_addr;
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u32 reserved1;
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};
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struct wmt_mci_caps {
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unsigned int f_min;
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unsigned int f_max;
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u32 ocr_avail;
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u32 caps;
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u32 max_seg_size;
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u32 max_segs;
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u32 max_blk_size;
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};
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struct wmt_mci_priv {
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struct mmc_host *mmc;
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void __iomem *sdmmc_base;
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int irq_regular;
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int irq_dma;
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void *dma_desc_buffer;
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dma_addr_t dma_desc_device_addr;
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struct completion cmdcomp;
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struct completion datacomp;
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struct completion *comp_cmd;
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struct completion *comp_dma;
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struct mmc_request *req;
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struct mmc_command *cmd;
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struct clk *clk_sdmmc;
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struct device *dev;
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u8 power_inverted;
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u8 cd_inverted;
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};
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static void wmt_set_sd_power(struct wmt_mci_priv *priv, int enable)
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{
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u32 reg_tmp = readb(priv->sdmmc_base + SDMMC_BUSMODE);
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if (enable ^ priv->power_inverted)
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reg_tmp &= ~BM_SD_OFF;
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else
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reg_tmp |= BM_SD_OFF;
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writeb(reg_tmp, priv->sdmmc_base + SDMMC_BUSMODE);
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}
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static void wmt_mci_read_response(struct mmc_host *mmc)
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{
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struct wmt_mci_priv *priv;
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int idx1, idx2;
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u8 tmp_resp;
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u32 response;
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priv = mmc_priv(mmc);
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for (idx1 = 0; idx1 < 4; idx1++) {
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response = 0;
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for (idx2 = 0; idx2 < 4; idx2++) {
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if ((idx1 == 3) && (idx2 == 3))
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tmp_resp = readb(priv->sdmmc_base + SDMMC_RSP);
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else
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tmp_resp = readb(priv->sdmmc_base + SDMMC_RSP +
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(idx1*4) + idx2 + 1);
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response |= (tmp_resp << (idx2 * 8));
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}
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priv->cmd->resp[idx1] = cpu_to_be32(response);
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}
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}
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static void wmt_mci_start_command(struct wmt_mci_priv *priv)
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{
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u32 reg_tmp;
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reg_tmp = readb(priv->sdmmc_base + SDMMC_CTLR);
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writeb(reg_tmp | CTLR_CMD_START, priv->sdmmc_base + SDMMC_CTLR);
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}
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static int wmt_mci_send_command(struct mmc_host *mmc, u8 command, u8 cmdtype,
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u32 arg, u8 rsptype)
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{
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struct wmt_mci_priv *priv;
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u32 reg_tmp;
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priv = mmc_priv(mmc);
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/* write command, arg, resptype registers */
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writeb(command, priv->sdmmc_base + SDMMC_CMD);
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writel(arg, priv->sdmmc_base + SDMMC_ARG);
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writeb(rsptype, priv->sdmmc_base + SDMMC_RSPTYPE);
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/* reset response FIFO */
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reg_tmp = readb(priv->sdmmc_base + SDMMC_CTLR);
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writeb(reg_tmp | CTLR_FIFO_RESET, priv->sdmmc_base + SDMMC_CTLR);
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/* ensure clock enabled - VT3465 */
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wmt_set_sd_power(priv, WMT_SD_POWER_ON);
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/* clear status bits */
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writeb(0xFF, priv->sdmmc_base + SDMMC_STS0);
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writeb(0xFF, priv->sdmmc_base + SDMMC_STS1);
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writeb(0xFF, priv->sdmmc_base + SDMMC_STS2);
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writeb(0xFF, priv->sdmmc_base + SDMMC_STS3);
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/* set command type */
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reg_tmp = readb(priv->sdmmc_base + SDMMC_CTLR);
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writeb((reg_tmp & 0x0F) | (cmdtype << 4),
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priv->sdmmc_base + SDMMC_CTLR);
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return 0;
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}
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static void wmt_mci_disable_dma(struct wmt_mci_priv *priv)
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{
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writel(DMA_ISR_INT_STS, priv->sdmmc_base + SDDMA_ISR);
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writel(0, priv->sdmmc_base + SDDMA_IER);
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}
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static void wmt_complete_data_request(struct wmt_mci_priv *priv)
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{
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struct mmc_request *req;
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req = priv->req;
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req->data->bytes_xfered = req->data->blksz * req->data->blocks;
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/* unmap the DMA pages used for write data */
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if (req->data->flags & MMC_DATA_WRITE)
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dma_unmap_sg(mmc_dev(priv->mmc), req->data->sg,
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req->data->sg_len, DMA_TO_DEVICE);
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else
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dma_unmap_sg(mmc_dev(priv->mmc), req->data->sg,
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req->data->sg_len, DMA_FROM_DEVICE);
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/* Check if the DMA ISR returned a data error */
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if ((req->cmd->error) || (req->data->error))
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mmc_request_done(priv->mmc, req);
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else {
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wmt_mci_read_response(priv->mmc);
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if (!req->data->stop) {
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/* single-block read/write requests end here */
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mmc_request_done(priv->mmc, req);
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} else {
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/*
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* we change the priv->cmd variable so the response is
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* stored in the stop struct rather than the original
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* calling command struct
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*/
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priv->comp_cmd = &priv->cmdcomp;
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init_completion(priv->comp_cmd);
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priv->cmd = req->data->stop;
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wmt_mci_send_command(priv->mmc, req->data->stop->opcode,
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7, req->data->stop->arg, 9);
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wmt_mci_start_command(priv);
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}
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}
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}
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static irqreturn_t wmt_mci_dma_isr(int irq_num, void *data)
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{
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struct wmt_mci_priv *priv;
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int status;
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priv = (struct wmt_mci_priv *)data;
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status = readl(priv->sdmmc_base + SDDMA_CCR) & 0x0F;
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if (status != DMA_CCR_EVT_SUCCESS) {
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dev_err(priv->dev, "DMA Error: Status = %d\n", status);
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priv->req->data->error = -ETIMEDOUT;
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complete(priv->comp_dma);
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return IRQ_HANDLED;
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}
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priv->req->data->error = 0;
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wmt_mci_disable_dma(priv);
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complete(priv->comp_dma);
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if (priv->comp_cmd) {
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if (completion_done(priv->comp_cmd)) {
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/*
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* if the command (regular) interrupt has already
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* completed, finish off the request otherwise we wait
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* for the command interrupt and finish from there.
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*/
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wmt_complete_data_request(priv);
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}
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}
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return IRQ_HANDLED;
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}
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static irqreturn_t wmt_mci_regular_isr(int irq_num, void *data)
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{
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struct wmt_mci_priv *priv;
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u32 status0;
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u32 status1;
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u32 status2;
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u32 reg_tmp;
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int cmd_done;
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priv = (struct wmt_mci_priv *)data;
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cmd_done = 0;
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status0 = readb(priv->sdmmc_base + SDMMC_STS0);
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status1 = readb(priv->sdmmc_base + SDMMC_STS1);
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status2 = readb(priv->sdmmc_base + SDMMC_STS2);
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/* Check for card insertion */
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reg_tmp = readb(priv->sdmmc_base + SDMMC_INTMASK0);
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if ((reg_tmp & INT0_DI_INT_EN) && (status0 & STS0_DEVICE_INS)) {
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mmc_detect_change(priv->mmc, 0);
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if (priv->cmd)
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priv->cmd->error = -ETIMEDOUT;
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if (priv->comp_cmd)
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complete(priv->comp_cmd);
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if (priv->comp_dma) {
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wmt_mci_disable_dma(priv);
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complete(priv->comp_dma);
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}
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writeb(STS0_DEVICE_INS, priv->sdmmc_base + SDMMC_STS0);
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return IRQ_HANDLED;
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}
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if ((!priv->req->data) ||
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((priv->req->data->stop) && (priv->cmd == priv->req->data->stop))) {
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/* handle non-data & stop_transmission requests */
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if (status1 & STS1_CMDRSP_DONE) {
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priv->cmd->error = 0;
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cmd_done = 1;
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} else if ((status1 & STS1_RSP_TIMEOUT) ||
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(status1 & STS1_DATA_TIMEOUT)) {
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priv->cmd->error = -ETIMEDOUT;
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cmd_done = 1;
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}
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if (cmd_done) {
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priv->comp_cmd = NULL;
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if (!priv->cmd->error)
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wmt_mci_read_response(priv->mmc);
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priv->cmd = NULL;
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mmc_request_done(priv->mmc, priv->req);
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}
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} else {
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/* handle data requests */
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if (status1 & STS1_CMDRSP_DONE) {
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if (priv->cmd)
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priv->cmd->error = 0;
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if (priv->comp_cmd)
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complete(priv->comp_cmd);
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}
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if ((status1 & STS1_RSP_TIMEOUT) ||
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(status1 & STS1_DATA_TIMEOUT)) {
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if (priv->cmd)
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priv->cmd->error = -ETIMEDOUT;
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if (priv->comp_cmd)
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complete(priv->comp_cmd);
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if (priv->comp_dma) {
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wmt_mci_disable_dma(priv);
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complete(priv->comp_dma);
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}
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}
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if (priv->comp_dma) {
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/*
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* If the dma interrupt has already completed, finish
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* off the request; otherwise we wait for the DMA
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* interrupt and finish from there.
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*/
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if (completion_done(priv->comp_dma))
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wmt_complete_data_request(priv);
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}
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}
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writeb(status0, priv->sdmmc_base + SDMMC_STS0);
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writeb(status1, priv->sdmmc_base + SDMMC_STS1);
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writeb(status2, priv->sdmmc_base + SDMMC_STS2);
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return IRQ_HANDLED;
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}
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static void wmt_reset_hardware(struct mmc_host *mmc)
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{
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struct wmt_mci_priv *priv;
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u32 reg_tmp;
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priv = mmc_priv(mmc);
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/* reset controller */
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reg_tmp = readb(priv->sdmmc_base + SDMMC_BUSMODE);
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writeb(reg_tmp | BM_SOFT_RESET, priv->sdmmc_base + SDMMC_BUSMODE);
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/* reset response FIFO */
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reg_tmp = readb(priv->sdmmc_base + SDMMC_CTLR);
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writeb(reg_tmp | CTLR_FIFO_RESET, priv->sdmmc_base + SDMMC_CTLR);
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/* enable GPI pin to detect card */
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writew(BLKL_INT_ENABLE | BLKL_GPI_CD, priv->sdmmc_base + SDMMC_BLKLEN);
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/* clear interrupt status */
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writeb(0xFF, priv->sdmmc_base + SDMMC_STS0);
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writeb(0xFF, priv->sdmmc_base + SDMMC_STS1);
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/* setup interrupts */
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writeb(INT0_CD_INT_EN | INT0_DI_INT_EN, priv->sdmmc_base +
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SDMMC_INTMASK0);
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writeb(INT1_DATA_TOUT_INT_EN | INT1_CMD_RES_TRAN_DONE_INT_EN |
|
|
INT1_CMD_RES_TOUT_INT_EN, priv->sdmmc_base + SDMMC_INTMASK1);
|
|
|
|
/* set the DMA timeout */
|
|
writew(8191, priv->sdmmc_base + SDMMC_DMATIMEOUT);
|
|
|
|
/* auto clock freezing enable */
|
|
reg_tmp = readb(priv->sdmmc_base + SDMMC_STS2);
|
|
writeb(reg_tmp | STS2_DIS_FORCECLK, priv->sdmmc_base + SDMMC_STS2);
|
|
|
|
/* set a default clock speed of 400Khz */
|
|
clk_set_rate(priv->clk_sdmmc, 400000);
|
|
}
|
|
|
|
static int wmt_dma_init(struct mmc_host *mmc)
|
|
{
|
|
struct wmt_mci_priv *priv;
|
|
|
|
priv = mmc_priv(mmc);
|
|
|
|
writel(DMA_GCR_SOFT_RESET, priv->sdmmc_base + SDDMA_GCR);
|
|
writel(DMA_GCR_DMA_EN, priv->sdmmc_base + SDDMA_GCR);
|
|
if ((readl(priv->sdmmc_base + SDDMA_GCR) & DMA_GCR_DMA_EN) != 0)
|
|
return 0;
|
|
else
|
|
return 1;
|
|
}
|
|
|
|
static void wmt_dma_init_descriptor(struct wmt_dma_descriptor *desc,
|
|
u16 req_count, u32 buffer_addr, u32 branch_addr, int end)
|
|
{
|
|
desc->flags = 0x40000000 | req_count;
|
|
if (end)
|
|
desc->flags |= 0x80000000;
|
|
desc->data_buffer_addr = buffer_addr;
|
|
desc->branch_addr = branch_addr;
|
|
}
|
|
|
|
static void wmt_dma_config(struct mmc_host *mmc, u32 descaddr, u8 dir)
|
|
{
|
|
struct wmt_mci_priv *priv;
|
|
u32 reg_tmp;
|
|
|
|
priv = mmc_priv(mmc);
|
|
|
|
/* Enable DMA Interrupts */
|
|
writel(DMA_IER_INT_EN, priv->sdmmc_base + SDDMA_IER);
|
|
|
|
/* Write DMA Descriptor Pointer Register */
|
|
writel(descaddr, priv->sdmmc_base + SDDMA_DESPR);
|
|
|
|
writel(0x00, priv->sdmmc_base + SDDMA_CCR);
|
|
|
|
if (dir == PDMA_WRITE) {
|
|
reg_tmp = readl(priv->sdmmc_base + SDDMA_CCR);
|
|
writel(reg_tmp & DMA_CCR_IF_TO_PERIPHERAL, priv->sdmmc_base +
|
|
SDDMA_CCR);
|
|
} else {
|
|
reg_tmp = readl(priv->sdmmc_base + SDDMA_CCR);
|
|
writel(reg_tmp | DMA_CCR_PERIPHERAL_TO_IF, priv->sdmmc_base +
|
|
SDDMA_CCR);
|
|
}
|
|
}
|
|
|
|
static void wmt_dma_start(struct wmt_mci_priv *priv)
|
|
{
|
|
u32 reg_tmp;
|
|
|
|
reg_tmp = readl(priv->sdmmc_base + SDDMA_CCR);
|
|
writel(reg_tmp | DMA_CCR_RUN, priv->sdmmc_base + SDDMA_CCR);
|
|
}
|
|
|
|
static void wmt_mci_request(struct mmc_host *mmc, struct mmc_request *req)
|
|
{
|
|
struct wmt_mci_priv *priv;
|
|
struct wmt_dma_descriptor *desc;
|
|
u8 command;
|
|
u8 cmdtype;
|
|
u32 arg;
|
|
u8 rsptype;
|
|
u32 reg_tmp;
|
|
|
|
struct scatterlist *sg;
|
|
int i;
|
|
int sg_cnt;
|
|
int offset;
|
|
u32 dma_address;
|
|
int desc_cnt;
|
|
|
|
priv = mmc_priv(mmc);
|
|
priv->req = req;
|
|
|
|
/*
|
|
* Use the cmd variable to pass a pointer to the resp[] structure
|
|
* This is required on multi-block requests to pass the pointer to the
|
|
* stop command
|
|
*/
|
|
priv->cmd = req->cmd;
|
|
|
|
command = req->cmd->opcode;
|
|
arg = req->cmd->arg;
|
|
rsptype = mmc_resp_type(req->cmd);
|
|
cmdtype = 0;
|
|
|
|
/* rsptype=7 only valid for SPI commands - should be =2 for SD */
|
|
if (rsptype == 7)
|
|
rsptype = 2;
|
|
/* rsptype=21 is R1B, convert for controller */
|
|
if (rsptype == 21)
|
|
rsptype = 9;
|
|
|
|
if (!req->data) {
|
|
wmt_mci_send_command(mmc, command, cmdtype, arg, rsptype);
|
|
wmt_mci_start_command(priv);
|
|
/* completion is now handled in the regular_isr() */
|
|
}
|
|
if (req->data) {
|
|
priv->comp_cmd = &priv->cmdcomp;
|
|
init_completion(priv->comp_cmd);
|
|
|
|
wmt_dma_init(mmc);
|
|
|
|
/* set controller data length */
|
|
reg_tmp = readw(priv->sdmmc_base + SDMMC_BLKLEN);
|
|
writew((reg_tmp & 0xF800) | (req->data->blksz - 1),
|
|
priv->sdmmc_base + SDMMC_BLKLEN);
|
|
|
|
/* set controller block count */
|
|
writew(req->data->blocks, priv->sdmmc_base + SDMMC_BLKCNT);
|
|
|
|
desc = (struct wmt_dma_descriptor *)priv->dma_desc_buffer;
|
|
|
|
if (req->data->flags & MMC_DATA_WRITE) {
|
|
sg_cnt = dma_map_sg(mmc_dev(mmc), req->data->sg,
|
|
req->data->sg_len, DMA_TO_DEVICE);
|
|
cmdtype = 1;
|
|
if (req->data->blocks > 1)
|
|
cmdtype = 3;
|
|
} else {
|
|
sg_cnt = dma_map_sg(mmc_dev(mmc), req->data->sg,
|
|
req->data->sg_len, DMA_FROM_DEVICE);
|
|
cmdtype = 2;
|
|
if (req->data->blocks > 1)
|
|
cmdtype = 4;
|
|
}
|
|
|
|
dma_address = priv->dma_desc_device_addr + 16;
|
|
desc_cnt = 0;
|
|
|
|
for_each_sg(req->data->sg, sg, sg_cnt, i) {
|
|
offset = 0;
|
|
while (offset < sg_dma_len(sg)) {
|
|
wmt_dma_init_descriptor(desc, req->data->blksz,
|
|
sg_dma_address(sg)+offset,
|
|
dma_address, 0);
|
|
desc++;
|
|
desc_cnt++;
|
|
offset += req->data->blksz;
|
|
dma_address += 16;
|
|
if (desc_cnt == req->data->blocks)
|
|
break;
|
|
}
|
|
}
|
|
desc--;
|
|
desc->flags |= 0x80000000;
|
|
|
|
if (req->data->flags & MMC_DATA_WRITE)
|
|
wmt_dma_config(mmc, priv->dma_desc_device_addr,
|
|
PDMA_WRITE);
|
|
else
|
|
wmt_dma_config(mmc, priv->dma_desc_device_addr,
|
|
PDMA_READ);
|
|
|
|
wmt_mci_send_command(mmc, command, cmdtype, arg, rsptype);
|
|
|
|
priv->comp_dma = &priv->datacomp;
|
|
init_completion(priv->comp_dma);
|
|
|
|
wmt_dma_start(priv);
|
|
wmt_mci_start_command(priv);
|
|
}
|
|
}
|
|
|
|
static void wmt_mci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
|
|
{
|
|
struct wmt_mci_priv *priv;
|
|
u32 busmode, extctrl;
|
|
|
|
priv = mmc_priv(mmc);
|
|
|
|
if (ios->power_mode == MMC_POWER_UP) {
|
|
wmt_reset_hardware(mmc);
|
|
|
|
wmt_set_sd_power(priv, WMT_SD_POWER_ON);
|
|
}
|
|
if (ios->power_mode == MMC_POWER_OFF)
|
|
wmt_set_sd_power(priv, WMT_SD_POWER_OFF);
|
|
|
|
if (ios->clock != 0)
|
|
clk_set_rate(priv->clk_sdmmc, ios->clock);
|
|
|
|
busmode = readb(priv->sdmmc_base + SDMMC_BUSMODE);
|
|
extctrl = readb(priv->sdmmc_base + SDMMC_EXTCTRL);
|
|
|
|
busmode &= ~(BM_EIGHTBIT_MODE | BM_FOURBIT_MODE);
|
|
extctrl &= ~EXT_EIGHTBIT;
|
|
|
|
switch (ios->bus_width) {
|
|
case MMC_BUS_WIDTH_8:
|
|
busmode |= BM_EIGHTBIT_MODE;
|
|
extctrl |= EXT_EIGHTBIT;
|
|
break;
|
|
case MMC_BUS_WIDTH_4:
|
|
busmode |= BM_FOURBIT_MODE;
|
|
break;
|
|
case MMC_BUS_WIDTH_1:
|
|
break;
|
|
}
|
|
|
|
writeb(busmode, priv->sdmmc_base + SDMMC_BUSMODE);
|
|
writeb(extctrl, priv->sdmmc_base + SDMMC_EXTCTRL);
|
|
}
|
|
|
|
static int wmt_mci_get_ro(struct mmc_host *mmc)
|
|
{
|
|
struct wmt_mci_priv *priv = mmc_priv(mmc);
|
|
|
|
return !(readb(priv->sdmmc_base + SDMMC_STS0) & STS0_WRITE_PROTECT);
|
|
}
|
|
|
|
static int wmt_mci_get_cd(struct mmc_host *mmc)
|
|
{
|
|
struct wmt_mci_priv *priv = mmc_priv(mmc);
|
|
u32 cd = (readb(priv->sdmmc_base + SDMMC_STS0) & STS0_CD_GPI) >> 3;
|
|
|
|
return !(cd ^ priv->cd_inverted);
|
|
}
|
|
|
|
static struct mmc_host_ops wmt_mci_ops = {
|
|
.request = wmt_mci_request,
|
|
.set_ios = wmt_mci_set_ios,
|
|
.get_ro = wmt_mci_get_ro,
|
|
.get_cd = wmt_mci_get_cd,
|
|
};
|
|
|
|
/* Controller capabilities */
|
|
static struct wmt_mci_caps wm8505_caps = {
|
|
.f_min = 390425,
|
|
.f_max = 50000000,
|
|
.ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34,
|
|
.caps = MMC_CAP_4_BIT_DATA | MMC_CAP_MMC_HIGHSPEED |
|
|
MMC_CAP_SD_HIGHSPEED,
|
|
.max_seg_size = 65024,
|
|
.max_segs = 128,
|
|
.max_blk_size = 2048,
|
|
};
|
|
|
|
static const struct of_device_id wmt_mci_dt_ids[] = {
|
|
{ .compatible = "wm,wm8505-sdhc", .data = &wm8505_caps },
|
|
{ /* Sentinel */ },
|
|
};
|
|
|
|
static int wmt_mci_probe(struct platform_device *pdev)
|
|
{
|
|
struct mmc_host *mmc;
|
|
struct wmt_mci_priv *priv;
|
|
struct device_node *np = pdev->dev.of_node;
|
|
const struct of_device_id *of_id =
|
|
of_match_device(wmt_mci_dt_ids, &pdev->dev);
|
|
const struct wmt_mci_caps *wmt_caps;
|
|
int ret;
|
|
int regular_irq, dma_irq;
|
|
|
|
if (!of_id || !of_id->data) {
|
|
dev_err(&pdev->dev, "Controller capabilities data missing\n");
|
|
return -EFAULT;
|
|
}
|
|
|
|
wmt_caps = of_id->data;
|
|
|
|
if (!np) {
|
|
dev_err(&pdev->dev, "Missing SDMMC description in devicetree\n");
|
|
return -EFAULT;
|
|
}
|
|
|
|
regular_irq = irq_of_parse_and_map(np, 0);
|
|
dma_irq = irq_of_parse_and_map(np, 1);
|
|
|
|
if (!regular_irq || !dma_irq) {
|
|
dev_err(&pdev->dev, "Getting IRQs failed!\n");
|
|
ret = -ENXIO;
|
|
goto fail1;
|
|
}
|
|
|
|
mmc = mmc_alloc_host(sizeof(struct wmt_mci_priv), &pdev->dev);
|
|
if (!mmc) {
|
|
dev_err(&pdev->dev, "Failed to allocate mmc_host\n");
|
|
ret = -ENOMEM;
|
|
goto fail1;
|
|
}
|
|
|
|
mmc->ops = &wmt_mci_ops;
|
|
mmc->f_min = wmt_caps->f_min;
|
|
mmc->f_max = wmt_caps->f_max;
|
|
mmc->ocr_avail = wmt_caps->ocr_avail;
|
|
mmc->caps = wmt_caps->caps;
|
|
|
|
mmc->max_seg_size = wmt_caps->max_seg_size;
|
|
mmc->max_segs = wmt_caps->max_segs;
|
|
mmc->max_blk_size = wmt_caps->max_blk_size;
|
|
|
|
mmc->max_req_size = (16*512*mmc->max_segs);
|
|
mmc->max_blk_count = mmc->max_req_size / 512;
|
|
|
|
priv = mmc_priv(mmc);
|
|
priv->mmc = mmc;
|
|
priv->dev = &pdev->dev;
|
|
|
|
priv->power_inverted = 0;
|
|
priv->cd_inverted = 0;
|
|
|
|
if (of_get_property(np, "sdon-inverted", NULL))
|
|
priv->power_inverted = 1;
|
|
if (of_get_property(np, "cd-inverted", NULL))
|
|
priv->cd_inverted = 1;
|
|
|
|
priv->sdmmc_base = of_iomap(np, 0);
|
|
if (!priv->sdmmc_base) {
|
|
dev_err(&pdev->dev, "Failed to map IO space\n");
|
|
ret = -ENOMEM;
|
|
goto fail2;
|
|
}
|
|
|
|
priv->irq_regular = regular_irq;
|
|
priv->irq_dma = dma_irq;
|
|
|
|
ret = request_irq(regular_irq, wmt_mci_regular_isr, 0, "sdmmc", priv);
|
|
if (ret) {
|
|
dev_err(&pdev->dev, "Register regular IRQ fail\n");
|
|
goto fail3;
|
|
}
|
|
|
|
ret = request_irq(dma_irq, wmt_mci_dma_isr, 0, "sdmmc", priv);
|
|
if (ret) {
|
|
dev_err(&pdev->dev, "Register DMA IRQ fail\n");
|
|
goto fail4;
|
|
}
|
|
|
|
/* alloc some DMA buffers for descriptors/transfers */
|
|
priv->dma_desc_buffer = dma_alloc_coherent(&pdev->dev,
|
|
mmc->max_blk_count * 16,
|
|
&priv->dma_desc_device_addr,
|
|
GFP_KERNEL);
|
|
if (!priv->dma_desc_buffer) {
|
|
dev_err(&pdev->dev, "DMA alloc fail\n");
|
|
ret = -EPERM;
|
|
goto fail5;
|
|
}
|
|
|
|
platform_set_drvdata(pdev, mmc);
|
|
|
|
priv->clk_sdmmc = of_clk_get(np, 0);
|
|
if (IS_ERR(priv->clk_sdmmc)) {
|
|
dev_err(&pdev->dev, "Error getting clock\n");
|
|
ret = PTR_ERR(priv->clk_sdmmc);
|
|
goto fail5;
|
|
}
|
|
|
|
clk_prepare_enable(priv->clk_sdmmc);
|
|
|
|
/* configure the controller to a known 'ready' state */
|
|
wmt_reset_hardware(mmc);
|
|
|
|
mmc_add_host(mmc);
|
|
|
|
dev_info(&pdev->dev, "WMT SDHC Controller initialized\n");
|
|
|
|
return 0;
|
|
fail5:
|
|
free_irq(dma_irq, priv);
|
|
fail4:
|
|
free_irq(regular_irq, priv);
|
|
fail3:
|
|
iounmap(priv->sdmmc_base);
|
|
fail2:
|
|
mmc_free_host(mmc);
|
|
fail1:
|
|
return ret;
|
|
}
|
|
|
|
static int wmt_mci_remove(struct platform_device *pdev)
|
|
{
|
|
struct mmc_host *mmc;
|
|
struct wmt_mci_priv *priv;
|
|
struct resource *res;
|
|
u32 reg_tmp;
|
|
|
|
mmc = platform_get_drvdata(pdev);
|
|
priv = mmc_priv(mmc);
|
|
|
|
/* reset SD controller */
|
|
reg_tmp = readb(priv->sdmmc_base + SDMMC_BUSMODE);
|
|
writel(reg_tmp | BM_SOFT_RESET, priv->sdmmc_base + SDMMC_BUSMODE);
|
|
reg_tmp = readw(priv->sdmmc_base + SDMMC_BLKLEN);
|
|
writew(reg_tmp & ~(0xA000), priv->sdmmc_base + SDMMC_BLKLEN);
|
|
writeb(0xFF, priv->sdmmc_base + SDMMC_STS0);
|
|
writeb(0xFF, priv->sdmmc_base + SDMMC_STS1);
|
|
|
|
/* release the dma buffers */
|
|
dma_free_coherent(&pdev->dev, priv->mmc->max_blk_count * 16,
|
|
priv->dma_desc_buffer, priv->dma_desc_device_addr);
|
|
|
|
mmc_remove_host(mmc);
|
|
|
|
free_irq(priv->irq_regular, priv);
|
|
free_irq(priv->irq_dma, priv);
|
|
|
|
iounmap(priv->sdmmc_base);
|
|
|
|
clk_disable_unprepare(priv->clk_sdmmc);
|
|
clk_put(priv->clk_sdmmc);
|
|
|
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
release_mem_region(res->start, resource_size(res));
|
|
|
|
mmc_free_host(mmc);
|
|
|
|
dev_info(&pdev->dev, "WMT MCI device removed\n");
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_PM
|
|
static int wmt_mci_suspend(struct device *dev)
|
|
{
|
|
u32 reg_tmp;
|
|
struct platform_device *pdev = to_platform_device(dev);
|
|
struct mmc_host *mmc = platform_get_drvdata(pdev);
|
|
struct wmt_mci_priv *priv;
|
|
|
|
if (!mmc)
|
|
return 0;
|
|
|
|
priv = mmc_priv(mmc);
|
|
reg_tmp = readb(priv->sdmmc_base + SDMMC_BUSMODE);
|
|
writeb(reg_tmp | BM_SOFT_RESET, priv->sdmmc_base +
|
|
SDMMC_BUSMODE);
|
|
|
|
reg_tmp = readw(priv->sdmmc_base + SDMMC_BLKLEN);
|
|
writew(reg_tmp & 0x5FFF, priv->sdmmc_base + SDMMC_BLKLEN);
|
|
|
|
writeb(0xFF, priv->sdmmc_base + SDMMC_STS0);
|
|
writeb(0xFF, priv->sdmmc_base + SDMMC_STS1);
|
|
|
|
clk_disable(priv->clk_sdmmc);
|
|
return 0;
|
|
}
|
|
|
|
static int wmt_mci_resume(struct device *dev)
|
|
{
|
|
u32 reg_tmp;
|
|
struct platform_device *pdev = to_platform_device(dev);
|
|
struct mmc_host *mmc = platform_get_drvdata(pdev);
|
|
struct wmt_mci_priv *priv;
|
|
|
|
if (mmc) {
|
|
priv = mmc_priv(mmc);
|
|
clk_enable(priv->clk_sdmmc);
|
|
|
|
reg_tmp = readb(priv->sdmmc_base + SDMMC_BUSMODE);
|
|
writeb(reg_tmp | BM_SOFT_RESET, priv->sdmmc_base +
|
|
SDMMC_BUSMODE);
|
|
|
|
reg_tmp = readw(priv->sdmmc_base + SDMMC_BLKLEN);
|
|
writew(reg_tmp | (BLKL_GPI_CD | BLKL_INT_ENABLE),
|
|
priv->sdmmc_base + SDMMC_BLKLEN);
|
|
|
|
reg_tmp = readb(priv->sdmmc_base + SDMMC_INTMASK0);
|
|
writeb(reg_tmp | INT0_DI_INT_EN, priv->sdmmc_base +
|
|
SDMMC_INTMASK0);
|
|
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct dev_pm_ops wmt_mci_pm = {
|
|
.suspend = wmt_mci_suspend,
|
|
.resume = wmt_mci_resume,
|
|
};
|
|
|
|
#define wmt_mci_pm_ops (&wmt_mci_pm)
|
|
|
|
#else /* !CONFIG_PM */
|
|
|
|
#define wmt_mci_pm_ops NULL
|
|
|
|
#endif
|
|
|
|
static struct platform_driver wmt_mci_driver = {
|
|
.probe = wmt_mci_probe,
|
|
.remove = wmt_mci_remove,
|
|
.driver = {
|
|
.name = DRIVER_NAME,
|
|
.pm = wmt_mci_pm_ops,
|
|
.of_match_table = wmt_mci_dt_ids,
|
|
},
|
|
};
|
|
|
|
module_platform_driver(wmt_mci_driver);
|
|
|
|
MODULE_DESCRIPTION("Wondermedia MMC/SD Driver");
|
|
MODULE_AUTHOR("Tony Prisk");
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_DEVICE_TABLE(of, wmt_mci_dt_ids);
|