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![Jaehoon Chung](/assets/img/avatar_default.png)
Remove the MMC_DATA_STREAM flag because it isn't used anymore. Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
1473 lines
40 KiB
C
1473 lines
40 KiB
C
/*
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* davinci_mmc.c - TI DaVinci MMC/SD/SDIO driver
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*
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* Copyright (C) 2006 Texas Instruments.
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* Original author: Purushotam Kumar
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* Copyright (C) 2009 David Brownell
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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 as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/module.h>
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#include <linux/ioport.h>
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#include <linux/platform_device.h>
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#include <linux/clk.h>
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#include <linux/err.h>
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#include <linux/cpufreq.h>
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#include <linux/mmc/host.h>
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#include <linux/io.h>
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#include <linux/irq.h>
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#include <linux/delay.h>
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#include <linux/dmaengine.h>
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#include <linux/dma-mapping.h>
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#include <linux/edma.h>
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#include <linux/mmc/mmc.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <linux/platform_data/edma.h>
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#include <linux/platform_data/mmc-davinci.h>
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/*
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* Register Definitions
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*/
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#define DAVINCI_MMCCTL 0x00 /* Control Register */
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#define DAVINCI_MMCCLK 0x04 /* Memory Clock Control Register */
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#define DAVINCI_MMCST0 0x08 /* Status Register 0 */
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#define DAVINCI_MMCST1 0x0C /* Status Register 1 */
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#define DAVINCI_MMCIM 0x10 /* Interrupt Mask Register */
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#define DAVINCI_MMCTOR 0x14 /* Response Time-Out Register */
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#define DAVINCI_MMCTOD 0x18 /* Data Read Time-Out Register */
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#define DAVINCI_MMCBLEN 0x1C /* Block Length Register */
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#define DAVINCI_MMCNBLK 0x20 /* Number of Blocks Register */
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#define DAVINCI_MMCNBLC 0x24 /* Number of Blocks Counter Register */
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#define DAVINCI_MMCDRR 0x28 /* Data Receive Register */
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#define DAVINCI_MMCDXR 0x2C /* Data Transmit Register */
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#define DAVINCI_MMCCMD 0x30 /* Command Register */
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#define DAVINCI_MMCARGHL 0x34 /* Argument Register */
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#define DAVINCI_MMCRSP01 0x38 /* Response Register 0 and 1 */
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#define DAVINCI_MMCRSP23 0x3C /* Response Register 0 and 1 */
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#define DAVINCI_MMCRSP45 0x40 /* Response Register 0 and 1 */
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#define DAVINCI_MMCRSP67 0x44 /* Response Register 0 and 1 */
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#define DAVINCI_MMCDRSP 0x48 /* Data Response Register */
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#define DAVINCI_MMCETOK 0x4C
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#define DAVINCI_MMCCIDX 0x50 /* Command Index Register */
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#define DAVINCI_MMCCKC 0x54
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#define DAVINCI_MMCTORC 0x58
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#define DAVINCI_MMCTODC 0x5C
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#define DAVINCI_MMCBLNC 0x60
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#define DAVINCI_SDIOCTL 0x64
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#define DAVINCI_SDIOST0 0x68
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#define DAVINCI_SDIOIEN 0x6C
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#define DAVINCI_SDIOIST 0x70
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#define DAVINCI_MMCFIFOCTL 0x74 /* FIFO Control Register */
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/* DAVINCI_MMCCTL definitions */
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#define MMCCTL_DATRST (1 << 0)
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#define MMCCTL_CMDRST (1 << 1)
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#define MMCCTL_WIDTH_8_BIT (1 << 8)
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#define MMCCTL_WIDTH_4_BIT (1 << 2)
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#define MMCCTL_DATEG_DISABLED (0 << 6)
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#define MMCCTL_DATEG_RISING (1 << 6)
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#define MMCCTL_DATEG_FALLING (2 << 6)
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#define MMCCTL_DATEG_BOTH (3 << 6)
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#define MMCCTL_PERMDR_LE (0 << 9)
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#define MMCCTL_PERMDR_BE (1 << 9)
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#define MMCCTL_PERMDX_LE (0 << 10)
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#define MMCCTL_PERMDX_BE (1 << 10)
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/* DAVINCI_MMCCLK definitions */
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#define MMCCLK_CLKEN (1 << 8)
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#define MMCCLK_CLKRT_MASK (0xFF << 0)
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/* IRQ bit definitions, for DAVINCI_MMCST0 and DAVINCI_MMCIM */
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#define MMCST0_DATDNE BIT(0) /* data done */
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#define MMCST0_BSYDNE BIT(1) /* busy done */
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#define MMCST0_RSPDNE BIT(2) /* command done */
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#define MMCST0_TOUTRD BIT(3) /* data read timeout */
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#define MMCST0_TOUTRS BIT(4) /* command response timeout */
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#define MMCST0_CRCWR BIT(5) /* data write CRC error */
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#define MMCST0_CRCRD BIT(6) /* data read CRC error */
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#define MMCST0_CRCRS BIT(7) /* command response CRC error */
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#define MMCST0_DXRDY BIT(9) /* data transmit ready (fifo empty) */
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#define MMCST0_DRRDY BIT(10) /* data receive ready (data in fifo)*/
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#define MMCST0_DATED BIT(11) /* DAT3 edge detect */
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#define MMCST0_TRNDNE BIT(12) /* transfer done */
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/* DAVINCI_MMCST1 definitions */
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#define MMCST1_BUSY (1 << 0)
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/* DAVINCI_MMCCMD definitions */
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#define MMCCMD_CMD_MASK (0x3F << 0)
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#define MMCCMD_PPLEN (1 << 7)
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#define MMCCMD_BSYEXP (1 << 8)
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#define MMCCMD_RSPFMT_MASK (3 << 9)
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#define MMCCMD_RSPFMT_NONE (0 << 9)
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#define MMCCMD_RSPFMT_R1456 (1 << 9)
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#define MMCCMD_RSPFMT_R2 (2 << 9)
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#define MMCCMD_RSPFMT_R3 (3 << 9)
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#define MMCCMD_DTRW (1 << 11)
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#define MMCCMD_STRMTP (1 << 12)
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#define MMCCMD_WDATX (1 << 13)
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#define MMCCMD_INITCK (1 << 14)
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#define MMCCMD_DCLR (1 << 15)
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#define MMCCMD_DMATRIG (1 << 16)
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/* DAVINCI_MMCFIFOCTL definitions */
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#define MMCFIFOCTL_FIFORST (1 << 0)
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#define MMCFIFOCTL_FIFODIR_WR (1 << 1)
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#define MMCFIFOCTL_FIFODIR_RD (0 << 1)
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#define MMCFIFOCTL_FIFOLEV (1 << 2) /* 0 = 128 bits, 1 = 256 bits */
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#define MMCFIFOCTL_ACCWD_4 (0 << 3) /* access width of 4 bytes */
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#define MMCFIFOCTL_ACCWD_3 (1 << 3) /* access width of 3 bytes */
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#define MMCFIFOCTL_ACCWD_2 (2 << 3) /* access width of 2 bytes */
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#define MMCFIFOCTL_ACCWD_1 (3 << 3) /* access width of 1 byte */
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/* DAVINCI_SDIOST0 definitions */
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#define SDIOST0_DAT1_HI BIT(0)
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/* DAVINCI_SDIOIEN definitions */
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#define SDIOIEN_IOINTEN BIT(0)
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/* DAVINCI_SDIOIST definitions */
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#define SDIOIST_IOINT BIT(0)
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/* MMCSD Init clock in Hz in opendrain mode */
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#define MMCSD_INIT_CLOCK 200000
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/*
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* One scatterlist dma "segment" is at most MAX_CCNT rw_threshold units,
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* and we handle up to MAX_NR_SG segments. MMC_BLOCK_BOUNCE kicks in only
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* for drivers with max_segs == 1, making the segments bigger (64KB)
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* than the page or two that's otherwise typical. nr_sg (passed from
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* platform data) == 16 gives at least the same throughput boost, using
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* EDMA transfer linkage instead of spending CPU time copying pages.
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*/
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#define MAX_CCNT ((1 << 16) - 1)
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#define MAX_NR_SG 16
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static unsigned rw_threshold = 32;
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module_param(rw_threshold, uint, S_IRUGO);
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MODULE_PARM_DESC(rw_threshold,
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"Read/Write threshold. Default = 32");
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static unsigned poll_threshold = 128;
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module_param(poll_threshold, uint, S_IRUGO);
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MODULE_PARM_DESC(poll_threshold,
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"Polling transaction size threshold. Default = 128");
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static unsigned poll_loopcount = 32;
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module_param(poll_loopcount, uint, S_IRUGO);
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MODULE_PARM_DESC(poll_loopcount,
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"Maximum polling loop count. Default = 32");
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static unsigned __initdata use_dma = 1;
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module_param(use_dma, uint, 0);
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MODULE_PARM_DESC(use_dma, "Whether to use DMA or not. Default = 1");
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struct mmc_davinci_host {
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struct mmc_command *cmd;
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struct mmc_data *data;
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struct mmc_host *mmc;
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struct clk *clk;
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unsigned int mmc_input_clk;
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void __iomem *base;
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struct resource *mem_res;
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int mmc_irq, sdio_irq;
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unsigned char bus_mode;
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#define DAVINCI_MMC_DATADIR_NONE 0
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#define DAVINCI_MMC_DATADIR_READ 1
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#define DAVINCI_MMC_DATADIR_WRITE 2
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unsigned char data_dir;
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/* buffer is used during PIO of one scatterlist segment, and
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* is updated along with buffer_bytes_left. bytes_left applies
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* to all N blocks of the PIO transfer.
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*/
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u8 *buffer;
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u32 buffer_bytes_left;
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u32 bytes_left;
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u32 rxdma, txdma;
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struct dma_chan *dma_tx;
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struct dma_chan *dma_rx;
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bool use_dma;
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bool do_dma;
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bool sdio_int;
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bool active_request;
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/* For PIO we walk scatterlists one segment at a time. */
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unsigned int sg_len;
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struct scatterlist *sg;
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/* Version of the MMC/SD controller */
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u8 version;
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/* for ns in one cycle calculation */
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unsigned ns_in_one_cycle;
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/* Number of sg segments */
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u8 nr_sg;
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#ifdef CONFIG_CPU_FREQ
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struct notifier_block freq_transition;
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#endif
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};
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static irqreturn_t mmc_davinci_irq(int irq, void *dev_id);
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/* PIO only */
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static void mmc_davinci_sg_to_buf(struct mmc_davinci_host *host)
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{
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host->buffer_bytes_left = sg_dma_len(host->sg);
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host->buffer = sg_virt(host->sg);
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if (host->buffer_bytes_left > host->bytes_left)
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host->buffer_bytes_left = host->bytes_left;
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}
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static void davinci_fifo_data_trans(struct mmc_davinci_host *host,
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unsigned int n)
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{
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u8 *p;
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unsigned int i;
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if (host->buffer_bytes_left == 0) {
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host->sg = sg_next(host->data->sg);
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mmc_davinci_sg_to_buf(host);
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}
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p = host->buffer;
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if (n > host->buffer_bytes_left)
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n = host->buffer_bytes_left;
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host->buffer_bytes_left -= n;
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host->bytes_left -= n;
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/* NOTE: we never transfer more than rw_threshold bytes
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* to/from the fifo here; there's no I/O overlap.
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* This also assumes that access width( i.e. ACCWD) is 4 bytes
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*/
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if (host->data_dir == DAVINCI_MMC_DATADIR_WRITE) {
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for (i = 0; i < (n >> 2); i++) {
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writel(*((u32 *)p), host->base + DAVINCI_MMCDXR);
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p = p + 4;
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}
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if (n & 3) {
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iowrite8_rep(host->base + DAVINCI_MMCDXR, p, (n & 3));
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p = p + (n & 3);
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}
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} else {
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for (i = 0; i < (n >> 2); i++) {
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*((u32 *)p) = readl(host->base + DAVINCI_MMCDRR);
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p = p + 4;
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}
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if (n & 3) {
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ioread8_rep(host->base + DAVINCI_MMCDRR, p, (n & 3));
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p = p + (n & 3);
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}
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}
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host->buffer = p;
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}
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static void mmc_davinci_start_command(struct mmc_davinci_host *host,
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struct mmc_command *cmd)
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{
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u32 cmd_reg = 0;
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u32 im_val;
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dev_dbg(mmc_dev(host->mmc), "CMD%d, arg 0x%08x%s\n",
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cmd->opcode, cmd->arg,
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({ char *s;
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switch (mmc_resp_type(cmd)) {
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case MMC_RSP_R1:
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s = ", R1/R5/R6/R7 response";
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break;
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case MMC_RSP_R1B:
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s = ", R1b response";
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break;
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case MMC_RSP_R2:
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s = ", R2 response";
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break;
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case MMC_RSP_R3:
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s = ", R3/R4 response";
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break;
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default:
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s = ", (R? response)";
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break;
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}; s; }));
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host->cmd = cmd;
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switch (mmc_resp_type(cmd)) {
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case MMC_RSP_R1B:
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/* There's some spec confusion about when R1B is
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* allowed, but if the card doesn't issue a BUSY
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* then it's harmless for us to allow it.
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*/
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cmd_reg |= MMCCMD_BSYEXP;
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/* FALLTHROUGH */
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case MMC_RSP_R1: /* 48 bits, CRC */
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cmd_reg |= MMCCMD_RSPFMT_R1456;
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break;
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case MMC_RSP_R2: /* 136 bits, CRC */
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cmd_reg |= MMCCMD_RSPFMT_R2;
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break;
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case MMC_RSP_R3: /* 48 bits, no CRC */
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cmd_reg |= MMCCMD_RSPFMT_R3;
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break;
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default:
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cmd_reg |= MMCCMD_RSPFMT_NONE;
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dev_dbg(mmc_dev(host->mmc), "unknown resp_type %04x\n",
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mmc_resp_type(cmd));
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break;
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}
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/* Set command index */
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cmd_reg |= cmd->opcode;
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/* Enable EDMA transfer triggers */
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if (host->do_dma)
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cmd_reg |= MMCCMD_DMATRIG;
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if (host->version == MMC_CTLR_VERSION_2 && host->data != NULL &&
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host->data_dir == DAVINCI_MMC_DATADIR_READ)
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cmd_reg |= MMCCMD_DMATRIG;
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/* Setting whether command involves data transfer or not */
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if (cmd->data)
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cmd_reg |= MMCCMD_WDATX;
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/* Setting whether data read or write */
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if (host->data_dir == DAVINCI_MMC_DATADIR_WRITE)
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cmd_reg |= MMCCMD_DTRW;
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if (host->bus_mode == MMC_BUSMODE_PUSHPULL)
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cmd_reg |= MMCCMD_PPLEN;
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/* set Command timeout */
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writel(0x1FFF, host->base + DAVINCI_MMCTOR);
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/* Enable interrupt (calculate here, defer until FIFO is stuffed). */
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im_val = MMCST0_RSPDNE | MMCST0_CRCRS | MMCST0_TOUTRS;
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if (host->data_dir == DAVINCI_MMC_DATADIR_WRITE) {
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im_val |= MMCST0_DATDNE | MMCST0_CRCWR;
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if (!host->do_dma)
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im_val |= MMCST0_DXRDY;
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} else if (host->data_dir == DAVINCI_MMC_DATADIR_READ) {
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im_val |= MMCST0_DATDNE | MMCST0_CRCRD | MMCST0_TOUTRD;
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if (!host->do_dma)
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im_val |= MMCST0_DRRDY;
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}
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/*
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* Before non-DMA WRITE commands the controller needs priming:
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* FIFO should be populated with 32 bytes i.e. whatever is the FIFO size
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*/
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if (!host->do_dma && (host->data_dir == DAVINCI_MMC_DATADIR_WRITE))
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davinci_fifo_data_trans(host, rw_threshold);
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writel(cmd->arg, host->base + DAVINCI_MMCARGHL);
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writel(cmd_reg, host->base + DAVINCI_MMCCMD);
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host->active_request = true;
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if (!host->do_dma && host->bytes_left <= poll_threshold) {
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u32 count = poll_loopcount;
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while (host->active_request && count--) {
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mmc_davinci_irq(0, host);
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cpu_relax();
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}
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}
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if (host->active_request)
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writel(im_val, host->base + DAVINCI_MMCIM);
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}
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/*----------------------------------------------------------------------*/
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/* DMA infrastructure */
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static void davinci_abort_dma(struct mmc_davinci_host *host)
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{
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struct dma_chan *sync_dev;
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if (host->data_dir == DAVINCI_MMC_DATADIR_READ)
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sync_dev = host->dma_rx;
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else
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sync_dev = host->dma_tx;
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dmaengine_terminate_all(sync_dev);
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}
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static int mmc_davinci_send_dma_request(struct mmc_davinci_host *host,
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struct mmc_data *data)
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{
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struct dma_chan *chan;
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struct dma_async_tx_descriptor *desc;
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int ret = 0;
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if (host->data_dir == DAVINCI_MMC_DATADIR_WRITE) {
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struct dma_slave_config dma_tx_conf = {
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.direction = DMA_MEM_TO_DEV,
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.dst_addr = host->mem_res->start + DAVINCI_MMCDXR,
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.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES,
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.dst_maxburst =
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rw_threshold / DMA_SLAVE_BUSWIDTH_4_BYTES,
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};
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chan = host->dma_tx;
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dmaengine_slave_config(host->dma_tx, &dma_tx_conf);
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desc = dmaengine_prep_slave_sg(host->dma_tx,
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data->sg,
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host->sg_len,
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DMA_MEM_TO_DEV,
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DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
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if (!desc) {
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dev_dbg(mmc_dev(host->mmc),
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"failed to allocate DMA TX descriptor");
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ret = -1;
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goto out;
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}
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} else {
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struct dma_slave_config dma_rx_conf = {
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.direction = DMA_DEV_TO_MEM,
|
|
.src_addr = host->mem_res->start + DAVINCI_MMCDRR,
|
|
.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES,
|
|
.src_maxburst =
|
|
rw_threshold / DMA_SLAVE_BUSWIDTH_4_BYTES,
|
|
};
|
|
chan = host->dma_rx;
|
|
dmaengine_slave_config(host->dma_rx, &dma_rx_conf);
|
|
|
|
desc = dmaengine_prep_slave_sg(host->dma_rx,
|
|
data->sg,
|
|
host->sg_len,
|
|
DMA_DEV_TO_MEM,
|
|
DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
|
|
if (!desc) {
|
|
dev_dbg(mmc_dev(host->mmc),
|
|
"failed to allocate DMA RX descriptor");
|
|
ret = -1;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
dmaengine_submit(desc);
|
|
dma_async_issue_pending(chan);
|
|
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static int mmc_davinci_start_dma_transfer(struct mmc_davinci_host *host,
|
|
struct mmc_data *data)
|
|
{
|
|
int i;
|
|
int mask = rw_threshold - 1;
|
|
int ret = 0;
|
|
|
|
host->sg_len = dma_map_sg(mmc_dev(host->mmc), data->sg, data->sg_len,
|
|
((data->flags & MMC_DATA_WRITE)
|
|
? DMA_TO_DEVICE
|
|
: DMA_FROM_DEVICE));
|
|
|
|
/* no individual DMA segment should need a partial FIFO */
|
|
for (i = 0; i < host->sg_len; i++) {
|
|
if (sg_dma_len(data->sg + i) & mask) {
|
|
dma_unmap_sg(mmc_dev(host->mmc),
|
|
data->sg, data->sg_len,
|
|
(data->flags & MMC_DATA_WRITE)
|
|
? DMA_TO_DEVICE
|
|
: DMA_FROM_DEVICE);
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
host->do_dma = 1;
|
|
ret = mmc_davinci_send_dma_request(host, data);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void __init_or_module
|
|
davinci_release_dma_channels(struct mmc_davinci_host *host)
|
|
{
|
|
if (!host->use_dma)
|
|
return;
|
|
|
|
dma_release_channel(host->dma_tx);
|
|
dma_release_channel(host->dma_rx);
|
|
}
|
|
|
|
static int __init davinci_acquire_dma_channels(struct mmc_davinci_host *host)
|
|
{
|
|
int r;
|
|
dma_cap_mask_t mask;
|
|
|
|
dma_cap_zero(mask);
|
|
dma_cap_set(DMA_SLAVE, mask);
|
|
|
|
host->dma_tx =
|
|
dma_request_slave_channel_compat(mask, edma_filter_fn,
|
|
&host->txdma, mmc_dev(host->mmc), "tx");
|
|
if (!host->dma_tx) {
|
|
dev_err(mmc_dev(host->mmc), "Can't get dma_tx channel\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
host->dma_rx =
|
|
dma_request_slave_channel_compat(mask, edma_filter_fn,
|
|
&host->rxdma, mmc_dev(host->mmc), "rx");
|
|
if (!host->dma_rx) {
|
|
dev_err(mmc_dev(host->mmc), "Can't get dma_rx channel\n");
|
|
r = -ENODEV;
|
|
goto free_master_write;
|
|
}
|
|
|
|
return 0;
|
|
|
|
free_master_write:
|
|
dma_release_channel(host->dma_tx);
|
|
|
|
return r;
|
|
}
|
|
|
|
/*----------------------------------------------------------------------*/
|
|
|
|
static void
|
|
mmc_davinci_prepare_data(struct mmc_davinci_host *host, struct mmc_request *req)
|
|
{
|
|
int fifo_lev = (rw_threshold == 32) ? MMCFIFOCTL_FIFOLEV : 0;
|
|
int timeout;
|
|
struct mmc_data *data = req->data;
|
|
|
|
if (host->version == MMC_CTLR_VERSION_2)
|
|
fifo_lev = (rw_threshold == 64) ? MMCFIFOCTL_FIFOLEV : 0;
|
|
|
|
host->data = data;
|
|
if (data == NULL) {
|
|
host->data_dir = DAVINCI_MMC_DATADIR_NONE;
|
|
writel(0, host->base + DAVINCI_MMCBLEN);
|
|
writel(0, host->base + DAVINCI_MMCNBLK);
|
|
return;
|
|
}
|
|
|
|
dev_dbg(mmc_dev(host->mmc), "%s, %d blocks of %d bytes\n",
|
|
(data->flags & MMC_DATA_WRITE) ? "write" : "read",
|
|
data->blocks, data->blksz);
|
|
dev_dbg(mmc_dev(host->mmc), " DTO %d cycles + %d ns\n",
|
|
data->timeout_clks, data->timeout_ns);
|
|
timeout = data->timeout_clks +
|
|
(data->timeout_ns / host->ns_in_one_cycle);
|
|
if (timeout > 0xffff)
|
|
timeout = 0xffff;
|
|
|
|
writel(timeout, host->base + DAVINCI_MMCTOD);
|
|
writel(data->blocks, host->base + DAVINCI_MMCNBLK);
|
|
writel(data->blksz, host->base + DAVINCI_MMCBLEN);
|
|
|
|
/* Configure the FIFO */
|
|
if (data->flags & MMC_DATA_WRITE) {
|
|
host->data_dir = DAVINCI_MMC_DATADIR_WRITE;
|
|
writel(fifo_lev | MMCFIFOCTL_FIFODIR_WR | MMCFIFOCTL_FIFORST,
|
|
host->base + DAVINCI_MMCFIFOCTL);
|
|
writel(fifo_lev | MMCFIFOCTL_FIFODIR_WR,
|
|
host->base + DAVINCI_MMCFIFOCTL);
|
|
} else {
|
|
host->data_dir = DAVINCI_MMC_DATADIR_READ;
|
|
writel(fifo_lev | MMCFIFOCTL_FIFODIR_RD | MMCFIFOCTL_FIFORST,
|
|
host->base + DAVINCI_MMCFIFOCTL);
|
|
writel(fifo_lev | MMCFIFOCTL_FIFODIR_RD,
|
|
host->base + DAVINCI_MMCFIFOCTL);
|
|
}
|
|
|
|
host->buffer = NULL;
|
|
host->bytes_left = data->blocks * data->blksz;
|
|
|
|
/* For now we try to use DMA whenever we won't need partial FIFO
|
|
* reads or writes, either for the whole transfer (as tested here)
|
|
* or for any individual scatterlist segment (tested when we call
|
|
* start_dma_transfer).
|
|
*
|
|
* While we *could* change that, unusual block sizes are rarely
|
|
* used. The occasional fallback to PIO should't hurt.
|
|
*/
|
|
if (host->use_dma && (host->bytes_left & (rw_threshold - 1)) == 0
|
|
&& mmc_davinci_start_dma_transfer(host, data) == 0) {
|
|
/* zero this to ensure we take no PIO paths */
|
|
host->bytes_left = 0;
|
|
} else {
|
|
/* Revert to CPU Copy */
|
|
host->sg_len = data->sg_len;
|
|
host->sg = host->data->sg;
|
|
mmc_davinci_sg_to_buf(host);
|
|
}
|
|
}
|
|
|
|
static void mmc_davinci_request(struct mmc_host *mmc, struct mmc_request *req)
|
|
{
|
|
struct mmc_davinci_host *host = mmc_priv(mmc);
|
|
unsigned long timeout = jiffies + msecs_to_jiffies(900);
|
|
u32 mmcst1 = 0;
|
|
|
|
/* Card may still be sending BUSY after a previous operation,
|
|
* typically some kind of write. If so, we can't proceed yet.
|
|
*/
|
|
while (time_before(jiffies, timeout)) {
|
|
mmcst1 = readl(host->base + DAVINCI_MMCST1);
|
|
if (!(mmcst1 & MMCST1_BUSY))
|
|
break;
|
|
cpu_relax();
|
|
}
|
|
if (mmcst1 & MMCST1_BUSY) {
|
|
dev_err(mmc_dev(host->mmc), "still BUSY? bad ... \n");
|
|
req->cmd->error = -ETIMEDOUT;
|
|
mmc_request_done(mmc, req);
|
|
return;
|
|
}
|
|
|
|
host->do_dma = 0;
|
|
mmc_davinci_prepare_data(host, req);
|
|
mmc_davinci_start_command(host, req->cmd);
|
|
}
|
|
|
|
static unsigned int calculate_freq_for_card(struct mmc_davinci_host *host,
|
|
unsigned int mmc_req_freq)
|
|
{
|
|
unsigned int mmc_freq = 0, mmc_pclk = 0, mmc_push_pull_divisor = 0;
|
|
|
|
mmc_pclk = host->mmc_input_clk;
|
|
if (mmc_req_freq && mmc_pclk > (2 * mmc_req_freq))
|
|
mmc_push_pull_divisor = ((unsigned int)mmc_pclk
|
|
/ (2 * mmc_req_freq)) - 1;
|
|
else
|
|
mmc_push_pull_divisor = 0;
|
|
|
|
mmc_freq = (unsigned int)mmc_pclk
|
|
/ (2 * (mmc_push_pull_divisor + 1));
|
|
|
|
if (mmc_freq > mmc_req_freq)
|
|
mmc_push_pull_divisor = mmc_push_pull_divisor + 1;
|
|
/* Convert ns to clock cycles */
|
|
if (mmc_req_freq <= 400000)
|
|
host->ns_in_one_cycle = (1000000) / (((mmc_pclk
|
|
/ (2 * (mmc_push_pull_divisor + 1)))/1000));
|
|
else
|
|
host->ns_in_one_cycle = (1000000) / (((mmc_pclk
|
|
/ (2 * (mmc_push_pull_divisor + 1)))/1000000));
|
|
|
|
return mmc_push_pull_divisor;
|
|
}
|
|
|
|
static void calculate_clk_divider(struct mmc_host *mmc, struct mmc_ios *ios)
|
|
{
|
|
unsigned int open_drain_freq = 0, mmc_pclk = 0;
|
|
unsigned int mmc_push_pull_freq = 0;
|
|
struct mmc_davinci_host *host = mmc_priv(mmc);
|
|
|
|
if (ios->bus_mode == MMC_BUSMODE_OPENDRAIN) {
|
|
u32 temp;
|
|
|
|
/* Ignoring the init clock value passed for fixing the inter
|
|
* operability with different cards.
|
|
*/
|
|
open_drain_freq = ((unsigned int)mmc_pclk
|
|
/ (2 * MMCSD_INIT_CLOCK)) - 1;
|
|
|
|
if (open_drain_freq > 0xFF)
|
|
open_drain_freq = 0xFF;
|
|
|
|
temp = readl(host->base + DAVINCI_MMCCLK) & ~MMCCLK_CLKRT_MASK;
|
|
temp |= open_drain_freq;
|
|
writel(temp, host->base + DAVINCI_MMCCLK);
|
|
|
|
/* Convert ns to clock cycles */
|
|
host->ns_in_one_cycle = (1000000) / (MMCSD_INIT_CLOCK/1000);
|
|
} else {
|
|
u32 temp;
|
|
mmc_push_pull_freq = calculate_freq_for_card(host, ios->clock);
|
|
|
|
if (mmc_push_pull_freq > 0xFF)
|
|
mmc_push_pull_freq = 0xFF;
|
|
|
|
temp = readl(host->base + DAVINCI_MMCCLK) & ~MMCCLK_CLKEN;
|
|
writel(temp, host->base + DAVINCI_MMCCLK);
|
|
|
|
udelay(10);
|
|
|
|
temp = readl(host->base + DAVINCI_MMCCLK) & ~MMCCLK_CLKRT_MASK;
|
|
temp |= mmc_push_pull_freq;
|
|
writel(temp, host->base + DAVINCI_MMCCLK);
|
|
|
|
writel(temp | MMCCLK_CLKEN, host->base + DAVINCI_MMCCLK);
|
|
|
|
udelay(10);
|
|
}
|
|
}
|
|
|
|
static void mmc_davinci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
|
|
{
|
|
struct mmc_davinci_host *host = mmc_priv(mmc);
|
|
struct platform_device *pdev = to_platform_device(mmc->parent);
|
|
struct davinci_mmc_config *config = pdev->dev.platform_data;
|
|
|
|
dev_dbg(mmc_dev(host->mmc),
|
|
"clock %dHz busmode %d powermode %d Vdd %04x\n",
|
|
ios->clock, ios->bus_mode, ios->power_mode,
|
|
ios->vdd);
|
|
|
|
switch (ios->power_mode) {
|
|
case MMC_POWER_OFF:
|
|
if (config && config->set_power)
|
|
config->set_power(pdev->id, false);
|
|
break;
|
|
case MMC_POWER_UP:
|
|
if (config && config->set_power)
|
|
config->set_power(pdev->id, true);
|
|
break;
|
|
}
|
|
|
|
switch (ios->bus_width) {
|
|
case MMC_BUS_WIDTH_8:
|
|
dev_dbg(mmc_dev(host->mmc), "Enabling 8 bit mode\n");
|
|
writel((readl(host->base + DAVINCI_MMCCTL) &
|
|
~MMCCTL_WIDTH_4_BIT) | MMCCTL_WIDTH_8_BIT,
|
|
host->base + DAVINCI_MMCCTL);
|
|
break;
|
|
case MMC_BUS_WIDTH_4:
|
|
dev_dbg(mmc_dev(host->mmc), "Enabling 4 bit mode\n");
|
|
if (host->version == MMC_CTLR_VERSION_2)
|
|
writel((readl(host->base + DAVINCI_MMCCTL) &
|
|
~MMCCTL_WIDTH_8_BIT) | MMCCTL_WIDTH_4_BIT,
|
|
host->base + DAVINCI_MMCCTL);
|
|
else
|
|
writel(readl(host->base + DAVINCI_MMCCTL) |
|
|
MMCCTL_WIDTH_4_BIT,
|
|
host->base + DAVINCI_MMCCTL);
|
|
break;
|
|
case MMC_BUS_WIDTH_1:
|
|
dev_dbg(mmc_dev(host->mmc), "Enabling 1 bit mode\n");
|
|
if (host->version == MMC_CTLR_VERSION_2)
|
|
writel(readl(host->base + DAVINCI_MMCCTL) &
|
|
~(MMCCTL_WIDTH_8_BIT | MMCCTL_WIDTH_4_BIT),
|
|
host->base + DAVINCI_MMCCTL);
|
|
else
|
|
writel(readl(host->base + DAVINCI_MMCCTL) &
|
|
~MMCCTL_WIDTH_4_BIT,
|
|
host->base + DAVINCI_MMCCTL);
|
|
break;
|
|
}
|
|
|
|
calculate_clk_divider(mmc, ios);
|
|
|
|
host->bus_mode = ios->bus_mode;
|
|
if (ios->power_mode == MMC_POWER_UP) {
|
|
unsigned long timeout = jiffies + msecs_to_jiffies(50);
|
|
bool lose = true;
|
|
|
|
/* Send clock cycles, poll completion */
|
|
writel(0, host->base + DAVINCI_MMCARGHL);
|
|
writel(MMCCMD_INITCK, host->base + DAVINCI_MMCCMD);
|
|
while (time_before(jiffies, timeout)) {
|
|
u32 tmp = readl(host->base + DAVINCI_MMCST0);
|
|
|
|
if (tmp & MMCST0_RSPDNE) {
|
|
lose = false;
|
|
break;
|
|
}
|
|
cpu_relax();
|
|
}
|
|
if (lose)
|
|
dev_warn(mmc_dev(host->mmc), "powerup timeout\n");
|
|
}
|
|
|
|
/* FIXME on power OFF, reset things ... */
|
|
}
|
|
|
|
static void
|
|
mmc_davinci_xfer_done(struct mmc_davinci_host *host, struct mmc_data *data)
|
|
{
|
|
host->data = NULL;
|
|
|
|
if (host->mmc->caps & MMC_CAP_SDIO_IRQ) {
|
|
/*
|
|
* SDIO Interrupt Detection work-around as suggested by
|
|
* Davinci Errata (TMS320DM355 Silicon Revision 1.1 Errata
|
|
* 2.1.6): Signal SDIO interrupt only if it is enabled by core
|
|
*/
|
|
if (host->sdio_int && !(readl(host->base + DAVINCI_SDIOST0) &
|
|
SDIOST0_DAT1_HI)) {
|
|
writel(SDIOIST_IOINT, host->base + DAVINCI_SDIOIST);
|
|
mmc_signal_sdio_irq(host->mmc);
|
|
}
|
|
}
|
|
|
|
if (host->do_dma) {
|
|
davinci_abort_dma(host);
|
|
|
|
dma_unmap_sg(mmc_dev(host->mmc), data->sg, data->sg_len,
|
|
(data->flags & MMC_DATA_WRITE)
|
|
? DMA_TO_DEVICE
|
|
: DMA_FROM_DEVICE);
|
|
host->do_dma = false;
|
|
}
|
|
host->data_dir = DAVINCI_MMC_DATADIR_NONE;
|
|
|
|
if (!data->stop || (host->cmd && host->cmd->error)) {
|
|
mmc_request_done(host->mmc, data->mrq);
|
|
writel(0, host->base + DAVINCI_MMCIM);
|
|
host->active_request = false;
|
|
} else
|
|
mmc_davinci_start_command(host, data->stop);
|
|
}
|
|
|
|
static void mmc_davinci_cmd_done(struct mmc_davinci_host *host,
|
|
struct mmc_command *cmd)
|
|
{
|
|
host->cmd = NULL;
|
|
|
|
if (cmd->flags & MMC_RSP_PRESENT) {
|
|
if (cmd->flags & MMC_RSP_136) {
|
|
/* response type 2 */
|
|
cmd->resp[3] = readl(host->base + DAVINCI_MMCRSP01);
|
|
cmd->resp[2] = readl(host->base + DAVINCI_MMCRSP23);
|
|
cmd->resp[1] = readl(host->base + DAVINCI_MMCRSP45);
|
|
cmd->resp[0] = readl(host->base + DAVINCI_MMCRSP67);
|
|
} else {
|
|
/* response types 1, 1b, 3, 4, 5, 6 */
|
|
cmd->resp[0] = readl(host->base + DAVINCI_MMCRSP67);
|
|
}
|
|
}
|
|
|
|
if (host->data == NULL || cmd->error) {
|
|
if (cmd->error == -ETIMEDOUT)
|
|
cmd->mrq->cmd->retries = 0;
|
|
mmc_request_done(host->mmc, cmd->mrq);
|
|
writel(0, host->base + DAVINCI_MMCIM);
|
|
host->active_request = false;
|
|
}
|
|
}
|
|
|
|
static inline void mmc_davinci_reset_ctrl(struct mmc_davinci_host *host,
|
|
int val)
|
|
{
|
|
u32 temp;
|
|
|
|
temp = readl(host->base + DAVINCI_MMCCTL);
|
|
if (val) /* reset */
|
|
temp |= MMCCTL_CMDRST | MMCCTL_DATRST;
|
|
else /* enable */
|
|
temp &= ~(MMCCTL_CMDRST | MMCCTL_DATRST);
|
|
|
|
writel(temp, host->base + DAVINCI_MMCCTL);
|
|
udelay(10);
|
|
}
|
|
|
|
static void
|
|
davinci_abort_data(struct mmc_davinci_host *host, struct mmc_data *data)
|
|
{
|
|
mmc_davinci_reset_ctrl(host, 1);
|
|
mmc_davinci_reset_ctrl(host, 0);
|
|
}
|
|
|
|
static irqreturn_t mmc_davinci_sdio_irq(int irq, void *dev_id)
|
|
{
|
|
struct mmc_davinci_host *host = dev_id;
|
|
unsigned int status;
|
|
|
|
status = readl(host->base + DAVINCI_SDIOIST);
|
|
if (status & SDIOIST_IOINT) {
|
|
dev_dbg(mmc_dev(host->mmc),
|
|
"SDIO interrupt status %x\n", status);
|
|
writel(status | SDIOIST_IOINT, host->base + DAVINCI_SDIOIST);
|
|
mmc_signal_sdio_irq(host->mmc);
|
|
}
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static irqreturn_t mmc_davinci_irq(int irq, void *dev_id)
|
|
{
|
|
struct mmc_davinci_host *host = (struct mmc_davinci_host *)dev_id;
|
|
unsigned int status, qstatus;
|
|
int end_command = 0;
|
|
int end_transfer = 0;
|
|
struct mmc_data *data = host->data;
|
|
|
|
if (host->cmd == NULL && host->data == NULL) {
|
|
status = readl(host->base + DAVINCI_MMCST0);
|
|
dev_dbg(mmc_dev(host->mmc),
|
|
"Spurious interrupt 0x%04x\n", status);
|
|
/* Disable the interrupt from mmcsd */
|
|
writel(0, host->base + DAVINCI_MMCIM);
|
|
return IRQ_NONE;
|
|
}
|
|
|
|
status = readl(host->base + DAVINCI_MMCST0);
|
|
qstatus = status;
|
|
|
|
/* handle FIFO first when using PIO for data.
|
|
* bytes_left will decrease to zero as I/O progress and status will
|
|
* read zero over iteration because this controller status
|
|
* register(MMCST0) reports any status only once and it is cleared
|
|
* by read. So, it is not unbouned loop even in the case of
|
|
* non-dma.
|
|
*/
|
|
if (host->bytes_left && (status & (MMCST0_DXRDY | MMCST0_DRRDY))) {
|
|
unsigned long im_val;
|
|
|
|
/*
|
|
* If interrupts fire during the following loop, they will be
|
|
* handled by the handler, but the PIC will still buffer these.
|
|
* As a result, the handler will be called again to serve these
|
|
* needlessly. In order to avoid these spurious interrupts,
|
|
* keep interrupts masked during the loop.
|
|
*/
|
|
im_val = readl(host->base + DAVINCI_MMCIM);
|
|
writel(0, host->base + DAVINCI_MMCIM);
|
|
|
|
do {
|
|
davinci_fifo_data_trans(host, rw_threshold);
|
|
status = readl(host->base + DAVINCI_MMCST0);
|
|
qstatus |= status;
|
|
} while (host->bytes_left &&
|
|
(status & (MMCST0_DXRDY | MMCST0_DRRDY)));
|
|
|
|
/*
|
|
* If an interrupt is pending, it is assumed it will fire when
|
|
* it is unmasked. This assumption is also taken when the MMCIM
|
|
* is first set. Otherwise, writing to MMCIM after reading the
|
|
* status is race-prone.
|
|
*/
|
|
writel(im_val, host->base + DAVINCI_MMCIM);
|
|
}
|
|
|
|
if (qstatus & MMCST0_DATDNE) {
|
|
/* All blocks sent/received, and CRC checks passed */
|
|
if (data != NULL) {
|
|
if ((host->do_dma == 0) && (host->bytes_left > 0)) {
|
|
/* if datasize < rw_threshold
|
|
* no RX ints are generated
|
|
*/
|
|
davinci_fifo_data_trans(host, host->bytes_left);
|
|
}
|
|
end_transfer = 1;
|
|
data->bytes_xfered = data->blocks * data->blksz;
|
|
} else {
|
|
dev_err(mmc_dev(host->mmc),
|
|
"DATDNE with no host->data\n");
|
|
}
|
|
}
|
|
|
|
if (qstatus & MMCST0_TOUTRD) {
|
|
/* Read data timeout */
|
|
data->error = -ETIMEDOUT;
|
|
end_transfer = 1;
|
|
|
|
dev_dbg(mmc_dev(host->mmc),
|
|
"read data timeout, status %x\n",
|
|
qstatus);
|
|
|
|
davinci_abort_data(host, data);
|
|
}
|
|
|
|
if (qstatus & (MMCST0_CRCWR | MMCST0_CRCRD)) {
|
|
/* Data CRC error */
|
|
data->error = -EILSEQ;
|
|
end_transfer = 1;
|
|
|
|
/* NOTE: this controller uses CRCWR to report both CRC
|
|
* errors and timeouts (on writes). MMCDRSP values are
|
|
* only weakly documented, but 0x9f was clearly a timeout
|
|
* case and the two three-bit patterns in various SD specs
|
|
* (101, 010) aren't part of it ...
|
|
*/
|
|
if (qstatus & MMCST0_CRCWR) {
|
|
u32 temp = readb(host->base + DAVINCI_MMCDRSP);
|
|
|
|
if (temp == 0x9f)
|
|
data->error = -ETIMEDOUT;
|
|
}
|
|
dev_dbg(mmc_dev(host->mmc), "data %s %s error\n",
|
|
(qstatus & MMCST0_CRCWR) ? "write" : "read",
|
|
(data->error == -ETIMEDOUT) ? "timeout" : "CRC");
|
|
|
|
davinci_abort_data(host, data);
|
|
}
|
|
|
|
if (qstatus & MMCST0_TOUTRS) {
|
|
/* Command timeout */
|
|
if (host->cmd) {
|
|
dev_dbg(mmc_dev(host->mmc),
|
|
"CMD%d timeout, status %x\n",
|
|
host->cmd->opcode, qstatus);
|
|
host->cmd->error = -ETIMEDOUT;
|
|
if (data) {
|
|
end_transfer = 1;
|
|
davinci_abort_data(host, data);
|
|
} else
|
|
end_command = 1;
|
|
}
|
|
}
|
|
|
|
if (qstatus & MMCST0_CRCRS) {
|
|
/* Command CRC error */
|
|
dev_dbg(mmc_dev(host->mmc), "Command CRC error\n");
|
|
if (host->cmd) {
|
|
host->cmd->error = -EILSEQ;
|
|
end_command = 1;
|
|
}
|
|
}
|
|
|
|
if (qstatus & MMCST0_RSPDNE) {
|
|
/* End of command phase */
|
|
end_command = (int) host->cmd;
|
|
}
|
|
|
|
if (end_command)
|
|
mmc_davinci_cmd_done(host, host->cmd);
|
|
if (end_transfer)
|
|
mmc_davinci_xfer_done(host, data);
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static int mmc_davinci_get_cd(struct mmc_host *mmc)
|
|
{
|
|
struct platform_device *pdev = to_platform_device(mmc->parent);
|
|
struct davinci_mmc_config *config = pdev->dev.platform_data;
|
|
|
|
if (!config || !config->get_cd)
|
|
return -ENOSYS;
|
|
return config->get_cd(pdev->id);
|
|
}
|
|
|
|
static int mmc_davinci_get_ro(struct mmc_host *mmc)
|
|
{
|
|
struct platform_device *pdev = to_platform_device(mmc->parent);
|
|
struct davinci_mmc_config *config = pdev->dev.platform_data;
|
|
|
|
if (!config || !config->get_ro)
|
|
return -ENOSYS;
|
|
return config->get_ro(pdev->id);
|
|
}
|
|
|
|
static void mmc_davinci_enable_sdio_irq(struct mmc_host *mmc, int enable)
|
|
{
|
|
struct mmc_davinci_host *host = mmc_priv(mmc);
|
|
|
|
if (enable) {
|
|
if (!(readl(host->base + DAVINCI_SDIOST0) & SDIOST0_DAT1_HI)) {
|
|
writel(SDIOIST_IOINT, host->base + DAVINCI_SDIOIST);
|
|
mmc_signal_sdio_irq(host->mmc);
|
|
} else {
|
|
host->sdio_int = true;
|
|
writel(readl(host->base + DAVINCI_SDIOIEN) |
|
|
SDIOIEN_IOINTEN, host->base + DAVINCI_SDIOIEN);
|
|
}
|
|
} else {
|
|
host->sdio_int = false;
|
|
writel(readl(host->base + DAVINCI_SDIOIEN) & ~SDIOIEN_IOINTEN,
|
|
host->base + DAVINCI_SDIOIEN);
|
|
}
|
|
}
|
|
|
|
static struct mmc_host_ops mmc_davinci_ops = {
|
|
.request = mmc_davinci_request,
|
|
.set_ios = mmc_davinci_set_ios,
|
|
.get_cd = mmc_davinci_get_cd,
|
|
.get_ro = mmc_davinci_get_ro,
|
|
.enable_sdio_irq = mmc_davinci_enable_sdio_irq,
|
|
};
|
|
|
|
/*----------------------------------------------------------------------*/
|
|
|
|
#ifdef CONFIG_CPU_FREQ
|
|
static int mmc_davinci_cpufreq_transition(struct notifier_block *nb,
|
|
unsigned long val, void *data)
|
|
{
|
|
struct mmc_davinci_host *host;
|
|
unsigned int mmc_pclk;
|
|
struct mmc_host *mmc;
|
|
unsigned long flags;
|
|
|
|
host = container_of(nb, struct mmc_davinci_host, freq_transition);
|
|
mmc = host->mmc;
|
|
mmc_pclk = clk_get_rate(host->clk);
|
|
|
|
if (val == CPUFREQ_POSTCHANGE) {
|
|
spin_lock_irqsave(&mmc->lock, flags);
|
|
host->mmc_input_clk = mmc_pclk;
|
|
calculate_clk_divider(mmc, &mmc->ios);
|
|
spin_unlock_irqrestore(&mmc->lock, flags);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static inline int mmc_davinci_cpufreq_register(struct mmc_davinci_host *host)
|
|
{
|
|
host->freq_transition.notifier_call = mmc_davinci_cpufreq_transition;
|
|
|
|
return cpufreq_register_notifier(&host->freq_transition,
|
|
CPUFREQ_TRANSITION_NOTIFIER);
|
|
}
|
|
|
|
static inline void mmc_davinci_cpufreq_deregister(struct mmc_davinci_host *host)
|
|
{
|
|
cpufreq_unregister_notifier(&host->freq_transition,
|
|
CPUFREQ_TRANSITION_NOTIFIER);
|
|
}
|
|
#else
|
|
static inline int mmc_davinci_cpufreq_register(struct mmc_davinci_host *host)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline void mmc_davinci_cpufreq_deregister(struct mmc_davinci_host *host)
|
|
{
|
|
}
|
|
#endif
|
|
static void __init init_mmcsd_host(struct mmc_davinci_host *host)
|
|
{
|
|
|
|
mmc_davinci_reset_ctrl(host, 1);
|
|
|
|
writel(0, host->base + DAVINCI_MMCCLK);
|
|
writel(MMCCLK_CLKEN, host->base + DAVINCI_MMCCLK);
|
|
|
|
writel(0x1FFF, host->base + DAVINCI_MMCTOR);
|
|
writel(0xFFFF, host->base + DAVINCI_MMCTOD);
|
|
|
|
mmc_davinci_reset_ctrl(host, 0);
|
|
}
|
|
|
|
static const struct platform_device_id davinci_mmc_devtype[] = {
|
|
{
|
|
.name = "dm6441-mmc",
|
|
.driver_data = MMC_CTLR_VERSION_1,
|
|
}, {
|
|
.name = "da830-mmc",
|
|
.driver_data = MMC_CTLR_VERSION_2,
|
|
},
|
|
{},
|
|
};
|
|
MODULE_DEVICE_TABLE(platform, davinci_mmc_devtype);
|
|
|
|
static const struct of_device_id davinci_mmc_dt_ids[] = {
|
|
{
|
|
.compatible = "ti,dm6441-mmc",
|
|
.data = &davinci_mmc_devtype[MMC_CTLR_VERSION_1],
|
|
},
|
|
{
|
|
.compatible = "ti,da830-mmc",
|
|
.data = &davinci_mmc_devtype[MMC_CTLR_VERSION_2],
|
|
},
|
|
{},
|
|
};
|
|
MODULE_DEVICE_TABLE(of, davinci_mmc_dt_ids);
|
|
|
|
static struct davinci_mmc_config
|
|
*mmc_parse_pdata(struct platform_device *pdev)
|
|
{
|
|
struct device_node *np;
|
|
struct davinci_mmc_config *pdata = pdev->dev.platform_data;
|
|
const struct of_device_id *match =
|
|
of_match_device(davinci_mmc_dt_ids, &pdev->dev);
|
|
u32 data;
|
|
|
|
np = pdev->dev.of_node;
|
|
if (!np)
|
|
return pdata;
|
|
|
|
pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
|
|
if (!pdata) {
|
|
dev_err(&pdev->dev, "Failed to allocate memory for struct davinci_mmc_config\n");
|
|
goto nodata;
|
|
}
|
|
|
|
if (match)
|
|
pdev->id_entry = match->data;
|
|
|
|
if (of_property_read_u32(np, "max-frequency", &pdata->max_freq))
|
|
dev_info(&pdev->dev, "'max-frequency' property not specified, defaulting to 25MHz\n");
|
|
|
|
of_property_read_u32(np, "bus-width", &data);
|
|
switch (data) {
|
|
case 1:
|
|
case 4:
|
|
case 8:
|
|
pdata->wires = data;
|
|
break;
|
|
default:
|
|
pdata->wires = 1;
|
|
dev_info(&pdev->dev, "Unsupported buswidth, defaulting to 1 bit\n");
|
|
}
|
|
nodata:
|
|
return pdata;
|
|
}
|
|
|
|
static int __init davinci_mmcsd_probe(struct platform_device *pdev)
|
|
{
|
|
struct davinci_mmc_config *pdata = NULL;
|
|
struct mmc_davinci_host *host = NULL;
|
|
struct mmc_host *mmc = NULL;
|
|
struct resource *r, *mem = NULL;
|
|
int ret = 0, irq = 0;
|
|
size_t mem_size;
|
|
const struct platform_device_id *id_entry;
|
|
|
|
pdata = mmc_parse_pdata(pdev);
|
|
if (pdata == NULL) {
|
|
dev_err(&pdev->dev, "Couldn't get platform data\n");
|
|
return -ENOENT;
|
|
}
|
|
|
|
ret = -ENODEV;
|
|
r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
irq = platform_get_irq(pdev, 0);
|
|
if (!r || irq == NO_IRQ)
|
|
goto out;
|
|
|
|
ret = -EBUSY;
|
|
mem_size = resource_size(r);
|
|
mem = request_mem_region(r->start, mem_size, pdev->name);
|
|
if (!mem)
|
|
goto out;
|
|
|
|
ret = -ENOMEM;
|
|
mmc = mmc_alloc_host(sizeof(struct mmc_davinci_host), &pdev->dev);
|
|
if (!mmc)
|
|
goto out;
|
|
|
|
host = mmc_priv(mmc);
|
|
host->mmc = mmc; /* Important */
|
|
|
|
r = platform_get_resource(pdev, IORESOURCE_DMA, 0);
|
|
if (!r)
|
|
dev_warn(&pdev->dev, "RX DMA resource not specified\n");
|
|
else
|
|
host->rxdma = r->start;
|
|
|
|
r = platform_get_resource(pdev, IORESOURCE_DMA, 1);
|
|
if (!r)
|
|
dev_warn(&pdev->dev, "TX DMA resource not specified\n");
|
|
else
|
|
host->txdma = r->start;
|
|
|
|
host->mem_res = mem;
|
|
host->base = ioremap(mem->start, mem_size);
|
|
if (!host->base)
|
|
goto out;
|
|
|
|
ret = -ENXIO;
|
|
host->clk = clk_get(&pdev->dev, "MMCSDCLK");
|
|
if (IS_ERR(host->clk)) {
|
|
ret = PTR_ERR(host->clk);
|
|
goto out;
|
|
}
|
|
clk_enable(host->clk);
|
|
host->mmc_input_clk = clk_get_rate(host->clk);
|
|
|
|
init_mmcsd_host(host);
|
|
|
|
if (pdata->nr_sg)
|
|
host->nr_sg = pdata->nr_sg - 1;
|
|
|
|
if (host->nr_sg > MAX_NR_SG || !host->nr_sg)
|
|
host->nr_sg = MAX_NR_SG;
|
|
|
|
host->use_dma = use_dma;
|
|
host->mmc_irq = irq;
|
|
host->sdio_irq = platform_get_irq(pdev, 1);
|
|
|
|
if (host->use_dma && davinci_acquire_dma_channels(host) != 0)
|
|
host->use_dma = 0;
|
|
|
|
/* REVISIT: someday, support IRQ-driven card detection. */
|
|
mmc->caps |= MMC_CAP_NEEDS_POLL;
|
|
mmc->caps |= MMC_CAP_WAIT_WHILE_BUSY;
|
|
|
|
if (pdata && (pdata->wires == 4 || pdata->wires == 0))
|
|
mmc->caps |= MMC_CAP_4_BIT_DATA;
|
|
|
|
if (pdata && (pdata->wires == 8))
|
|
mmc->caps |= (MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA);
|
|
|
|
id_entry = platform_get_device_id(pdev);
|
|
if (id_entry)
|
|
host->version = id_entry->driver_data;
|
|
|
|
mmc->ops = &mmc_davinci_ops;
|
|
mmc->f_min = 312500;
|
|
mmc->f_max = 25000000;
|
|
if (pdata && pdata->max_freq)
|
|
mmc->f_max = pdata->max_freq;
|
|
if (pdata && pdata->caps)
|
|
mmc->caps |= pdata->caps;
|
|
mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
|
|
|
|
/* With no iommu coalescing pages, each phys_seg is a hw_seg.
|
|
* Each hw_seg uses one EDMA parameter RAM slot, always one
|
|
* channel and then usually some linked slots.
|
|
*/
|
|
mmc->max_segs = MAX_NR_SG;
|
|
|
|
/* EDMA limit per hw segment (one or two MBytes) */
|
|
mmc->max_seg_size = MAX_CCNT * rw_threshold;
|
|
|
|
/* MMC/SD controller limits for multiblock requests */
|
|
mmc->max_blk_size = 4095; /* BLEN is 12 bits */
|
|
mmc->max_blk_count = 65535; /* NBLK is 16 bits */
|
|
mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count;
|
|
|
|
dev_dbg(mmc_dev(host->mmc), "max_segs=%d\n", mmc->max_segs);
|
|
dev_dbg(mmc_dev(host->mmc), "max_blk_size=%d\n", mmc->max_blk_size);
|
|
dev_dbg(mmc_dev(host->mmc), "max_req_size=%d\n", mmc->max_req_size);
|
|
dev_dbg(mmc_dev(host->mmc), "max_seg_size=%d\n", mmc->max_seg_size);
|
|
|
|
platform_set_drvdata(pdev, host);
|
|
|
|
ret = mmc_davinci_cpufreq_register(host);
|
|
if (ret) {
|
|
dev_err(&pdev->dev, "failed to register cpufreq\n");
|
|
goto cpu_freq_fail;
|
|
}
|
|
|
|
ret = mmc_add_host(mmc);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
ret = request_irq(irq, mmc_davinci_irq, 0, mmc_hostname(mmc), host);
|
|
if (ret)
|
|
goto out;
|
|
|
|
if (host->sdio_irq >= 0) {
|
|
ret = request_irq(host->sdio_irq, mmc_davinci_sdio_irq, 0,
|
|
mmc_hostname(mmc), host);
|
|
if (!ret)
|
|
mmc->caps |= MMC_CAP_SDIO_IRQ;
|
|
}
|
|
|
|
rename_region(mem, mmc_hostname(mmc));
|
|
|
|
dev_info(mmc_dev(host->mmc), "Using %s, %d-bit mode\n",
|
|
host->use_dma ? "DMA" : "PIO",
|
|
(mmc->caps & MMC_CAP_4_BIT_DATA) ? 4 : 1);
|
|
|
|
return 0;
|
|
|
|
out:
|
|
mmc_davinci_cpufreq_deregister(host);
|
|
cpu_freq_fail:
|
|
if (host) {
|
|
davinci_release_dma_channels(host);
|
|
|
|
if (host->clk) {
|
|
clk_disable(host->clk);
|
|
clk_put(host->clk);
|
|
}
|
|
|
|
if (host->base)
|
|
iounmap(host->base);
|
|
}
|
|
|
|
if (mmc)
|
|
mmc_free_host(mmc);
|
|
|
|
if (mem)
|
|
release_resource(mem);
|
|
|
|
dev_dbg(&pdev->dev, "probe err %d\n", ret);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int __exit davinci_mmcsd_remove(struct platform_device *pdev)
|
|
{
|
|
struct mmc_davinci_host *host = platform_get_drvdata(pdev);
|
|
|
|
if (host) {
|
|
mmc_davinci_cpufreq_deregister(host);
|
|
|
|
mmc_remove_host(host->mmc);
|
|
free_irq(host->mmc_irq, host);
|
|
if (host->mmc->caps & MMC_CAP_SDIO_IRQ)
|
|
free_irq(host->sdio_irq, host);
|
|
|
|
davinci_release_dma_channels(host);
|
|
|
|
clk_disable(host->clk);
|
|
clk_put(host->clk);
|
|
|
|
iounmap(host->base);
|
|
|
|
release_resource(host->mem_res);
|
|
|
|
mmc_free_host(host->mmc);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_PM
|
|
static int davinci_mmcsd_suspend(struct device *dev)
|
|
{
|
|
struct platform_device *pdev = to_platform_device(dev);
|
|
struct mmc_davinci_host *host = platform_get_drvdata(pdev);
|
|
|
|
writel(0, host->base + DAVINCI_MMCIM);
|
|
mmc_davinci_reset_ctrl(host, 1);
|
|
clk_disable(host->clk);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int davinci_mmcsd_resume(struct device *dev)
|
|
{
|
|
struct platform_device *pdev = to_platform_device(dev);
|
|
struct mmc_davinci_host *host = platform_get_drvdata(pdev);
|
|
|
|
clk_enable(host->clk);
|
|
mmc_davinci_reset_ctrl(host, 0);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct dev_pm_ops davinci_mmcsd_pm = {
|
|
.suspend = davinci_mmcsd_suspend,
|
|
.resume = davinci_mmcsd_resume,
|
|
};
|
|
|
|
#define davinci_mmcsd_pm_ops (&davinci_mmcsd_pm)
|
|
#else
|
|
#define davinci_mmcsd_pm_ops NULL
|
|
#endif
|
|
|
|
static struct platform_driver davinci_mmcsd_driver = {
|
|
.driver = {
|
|
.name = "davinci_mmc",
|
|
.pm = davinci_mmcsd_pm_ops,
|
|
.of_match_table = davinci_mmc_dt_ids,
|
|
},
|
|
.remove = __exit_p(davinci_mmcsd_remove),
|
|
.id_table = davinci_mmc_devtype,
|
|
};
|
|
|
|
module_platform_driver_probe(davinci_mmcsd_driver, davinci_mmcsd_probe);
|
|
|
|
MODULE_AUTHOR("Texas Instruments India");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_DESCRIPTION("MMC/SD driver for Davinci MMC controller");
|
|
MODULE_ALIAS("platform:davinci_mmc");
|
|
|