Re: [PATCH v2] mmc: add new au6601 driver

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On Sat, Sep 27, 2014 at 12:41 PM, Oleksij Rempel <linux@xxxxxxxxxxxxxxxx> wrote:
>
> This driver is based on documentation which was based on my RE-work and
> comparision with other MMC drivers.
> It works in legacy mode and can provide 20MB/s R/W spead for most modern
> SD cards, even if at least 40MB/s should be possible on this hardware.
> It was not possible provide description for all register. But some of them
> are important to make this hardware work in some unknown way.
>
> Biggest part of RE-work was done by emulating AU6601 in QEMU.
>
> Signed-off-by: Oleksij Rempel <linux@xxxxxxxxxxxxxxxx>
> ---
>  drivers/mmc/host/Kconfig  |    8 +
>  drivers/mmc/host/Makefile |    1 +
>  drivers/mmc/host/au6601.c | 1215 +++++++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 1224 insertions(+)
>  create mode 100644 drivers/mmc/host/au6601.c
>
> --- /dev/null
> +++ b/drivers/mmc/host/au6601.c
> @@ -0,0 +1,1215 @@
> +/*
> + * Copyright (C) 2014 Oleksij Rempel.
> + *
> + * Authors: Oleksij Rempel <linux@xxxxxxxxxxxxxxxx>
> + *
> + * This software is licensed under the terms of the GNU General Public
> + * License version 2, as published by the Free Software Foundation, and
> + * may be copied, distributed, and modified under those terms.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + *
> + */
> +
> +
> +#include <linux/delay.h>
> +#include <linux/pci.h>
> +#include <linux/module.h>
> +#include <linux/io.h>
> +#include <linux/pm.h>
> +#include <linux/irq.h>
> +#include <linux/interrupt.h>
> +
> +#include <linux/mmc/host.h>
> +#include <linux/mmc/mmc.h>
> +
> +#define DRVNAME                        "au6601-pci"
> +#define PCI_ID_ALCOR_MICRO     0x1aea
> +#define PCI_ID_AU6601          0x6601
> +
> +#define MHZ_TO_HZ(freq)        ((freq) * 1000 * 1000)
> +
> +#define AU6601_MIN_CLOCK               (150 * 1000)
> +#define AU6601_MAX_CLOCK               MHZ_TO_HZ(208)
> +#define AU6601_MAX_SEGMENTS            512
> +#define AU6601_MAX_BLOCK_LENGTH                512
> +#define AU6601_MAX_DMA_BLOCKS          8
> +#define AU6601_DMA_LOCAL_SEGMENTS      3
> +#define AU6601_MAX_BLOCK_COUNT         65536
> +
> +/* SDMA phy address. Higer then 0x0800.0000? */
> +#define AU6601_REG_SDMA_ADDR   0x00
> + #define AU6601_SDMA_MASK      0xfffff000
> +/* ADMA block count? AU6621 only. */
> +#define REG_05 0x05
> +/* PIO */
> +#define AU6601_REG_BUFFER      0x08
> +/* ADMA ctrl? AU6621 only. */
> +#define REG_0C 0x0c
> +/* ADMA phy address. AU6621 only. */
> +#define REG_10 0x10
> +/* CMD index */
> +#define AU6601_REG_CMD_OPCODE  0x23
> +/* CMD parametr */
> +#define AU6601_REG_CMD_ARG     0x24
> +/* CMD response 4x4 Bytes */
> +#define AU6601_REG_CMD_RSP0    0x30
> +#define AU6601_REG_CMD_RSP1    0x34
> +#define AU6601_REG_CMD_RSP2    0x38
> +#define AU6601_REG_CMD_RSP3    0x3C
> +/* LED ctrl? */
> +#define REG_51 0x51
> +/* ??? */
> +#define REG_52 0x52
> +/* LED related? Always toggled BIT0 */
> +#define REG_61 0x61
> +/* Same as REG_61? */
> +#define REG_63 0x63
> +/* ??? */
> +#define REG_69 0x69
> +/* Block size for SDMA or PIO */
> +#define AU6601_REG_BLOCK_SIZE  0x6c
> +/* Some power related reg, used together with REG_7A */
> +#define REG_70 0x70
> +/* PLL ctrl */
> +#define AU6601_REG_PLL_CTRL    0x72
> +/* ??? */
> +#define REG_74 0x74
> +/* ??? */
> +#define REG_75 0x75
> +/* card slot state? */
> +#define REG_76 0x76
> +/* ??? */
> +#define REG_77 0x77
> +/* looks like soft reset? */
> +#define AU6601_REG_SW_RESET    0x79
> + #define AU6601_RESET_UNK      BIT(7)  /* unknown bit */
> + #define AU6601_RESET_DATA     BIT(3)
> + #define AU6601_RESET_CMD      BIT(0)
> +/* see REG_70 */
> +#define REG_7A 0x7a
> +/* ??? Padding? Timeing? */
> +#define REG_7B 0x7b
> +/* ??? Padding? Timeing? */
> +#define REG_7C 0x7c
> +/* ??? Padding? Timeing? */
> +#define REG_7D 0x7d
> +/* read EEPROM? */
> +#define REG_7F 0x7f
> +
> +#define AU6601_REG_CMD_CTRL    0x81
> +#define AU6601_REG_BUS_CTRL    0x82
> + #define AU6601_BUS_WIDTH_4BIT BIT(5)
> +#define REG_83 0x83
> +
> +#define AU6601_REG_BUS_STATUS  0x84
> + #define AU6601_BUS_STAT_CMD   BIT(15)
> +/* BIT(4) - BIT(7) are permanently 1.
> + * May be reseved or not attached DAT4-DAT7 */
> + #define AU6601_BUS_STAT_DAT3          BIT(3)
> + #define AU6601_BUS_STAT_DAT2          BIT(2)
> + #define AU6601_BUS_STAT_DAT1          BIT(1)
> + #define AU6601_BUS_STAT_DAT0          BIT(0)
> + #define AU6601_BUS_STAT_DAT_MASK      0xf
> +#define REG_85 0x85
> +/* ??? */
> +#define REG_86 0x86
> +#define AU6601_REG_INT_STATUS  0x90 /* IRQ intmask */
> +#define AU6601_REG_INT_ENABLE  0x94
> +/* ??? */
> +#define REG_A1 0xa1
> +/* ??? */
> +#define REG_A2 0xa2
> +/* ??? */
> +#define REG_A3 0xa3
> +/* ??? */
> +#define REG_B0 0xb0
> +/* ??? */
> +#define REG_B4 0xb4
> +
> + /* AU6601_REG_INT_STATUS is identical or almost identical with sdhci.h */
> + /* OK - are tested and confirmed bits */
> + #define  AU6601_INT_RESPONSE          0x00000001      /* ok */
> + #define  AU6601_INT_DATA_END          0x00000002      /* fifo, ok */
> + #define  AU6601_INT_BLK_GAP           0x00000004
> + #define  AU6601_INT_DMA_END           0x00000008
> + #define  AU6601_INT_SPACE_AVAIL       0x00000010      /* fifo, ok */
> + #define  AU6601_INT_DATA_AVAIL                0x00000020      /* fifo, ok */
> + #define  AU6601_INT_CARD_REMOVE       0x00000040
> + #define  AU6601_INT_CARD_INSERT       0x00000080      /* 0x40 and 0x80 flip */
> + #define  AU6601_INT_CARD_INT          0x00000100
> + #define  AU6601_INT_ERROR             0x00008000      /* ok */
> + #define  AU6601_INT_TIMEOUT           0x00010000      /* seems to be ok */
> + #define  AU6601_INT_CRC               0x00020000      /* seems to be ok */
> + #define  AU6601_INT_END_BIT           0x00040000
> + #define  AU6601_INT_INDEX             0x00080000
> + #define  AU6601_INT_DATA_TIMEOUT      0x00100000
> + #define  AU6601_INT_DATA_CRC          0x00200000
> + #define  AU6601_INT_DATA_END_BIT      0x00400000
> + #define  AU6601_INT_BUS_POWER         0x00800000
> + #define  AU6601_INT_ACMD12ERR         0x01000000
> + #define  AU6601_INT_ADMA_ERROR                0x02000000
> +
> + #define  AU6601_INT_NORMAL_MASK       0x00007FFF
> + #define  AU6601_INT_ERROR_MASK                0xFFFF8000
> +
> +/* magic 0xF0001 */
> + #define  AU6601_INT_CMD_MASK  (AU6601_INT_RESPONSE | AU6601_INT_TIMEOUT | \
> +               AU6601_INT_CRC | AU6601_INT_END_BIT | AU6601_INT_INDEX)
> +/* magic 0x70003A */
> + #define  AU6601_INT_DATA_MASK (AU6601_INT_DATA_END | AU6601_INT_DMA_END | \
> +               AU6601_INT_DATA_AVAIL | AU6601_INT_SPACE_AVAIL | \
> +               AU6601_INT_DATA_TIMEOUT | AU6601_INT_DATA_CRC | \
> +               AU6601_INT_DATA_END_BIT)
> + #define AU6601_INT_ALL_MASK   ((uint32_t)-1)
> +
> +bool disable_dma = 0;
> +
> +struct au6601_host {
> +       struct pci_dev *pdev;
> +       struct  device *dev;
> +       void __iomem *iobase;
> +       void __iomem *virt_base;
> +       dma_addr_t phys_base;
> +
> +       struct mmc_host *mmc;
> +       struct mmc_request *mrq;
> +       struct mmc_command *cmd;
> +       struct mmc_data *data;
> +       unsigned int data_early:1;      /* Data finished before cmd */
> +       unsigned int dma_on:1;
> +       unsigned int trigger_dma_dac:1; /* Trigger Data after Command.
> +                                        * In some cases data ragister
> +                                        * should be triggered after
> +                                        * command was done */
> +
> +       struct mutex cmd_mutex;
> +
> +       struct timer_list timer;
> +
> +       struct sg_mapping_iter sg_miter;        /* SG state for PIO */
> +       unsigned int blocks;            /* remaining PIO blocks */
> +       unsigned int requested_blocks;          /* count of requested */
> +       int sg_count;      /* Mapped sg entries */
> +};
> +
> +static void au6601_send_cmd(struct au6601_host *host,
> +                           struct mmc_command *cmd);
> +
> +static void au6601_prepare_data(struct au6601_host *host,
> +                               struct mmc_command *cmd);
> +static void au6601_finish_data(struct au6601_host *host);
> +static void au6601_request_complete(struct au6601_host *host);
> +
> +static const struct pci_device_id pci_ids[] = {
> +       {
> +               .vendor  = PCI_ID_ALCOR_MICRO,
> +               .device  = PCI_ID_AU6601,
> +               .subvendor      = PCI_ANY_ID,
> +               .subdevice      = PCI_ANY_ID,
> +       },
> +       { /* end: all zeroes */ },
> +};
> +MODULE_DEVICE_TABLE(pci, pci_ids);
> +
> +static inline void au6601_rmw(void __iomem *reg, u32 clear, u32 set)
> +{
> +       u32 var;
> +
> +       var = ioread32(reg);
> +       var &= ~clear;
> +       var |= set;
> +       iowrite32(var, reg);
> +}
> +
> +static inline void au6601_mask_irqs(struct au6601_host *host)
> +{
> +       iowrite32(0, host->iobase + AU6601_REG_INT_ENABLE);
> +}
> +
> +static inline void au6601_unmask_irqs(struct au6601_host *host)
> +{
> +       iowrite32(AU6601_INT_CMD_MASK | AU6601_INT_DATA_MASK |
> +                 AU6601_INT_CARD_INSERT | AU6601_INT_CARD_REMOVE |
> +                 AU6601_INT_CARD_INT | AU6601_INT_BUS_POWER,
> +                 host->iobase + AU6601_REG_INT_ENABLE);
> +}
> +
> +static void au6601_clear_set_reg86(struct au6601_host *host, u32 clear, u32 set)
> +{
> +       au6601_rmw(host->iobase + REG_86, clear, set);
> +}
> +
> +/*
> + * check if one of data line is pulled down
> + */
> +static inline int au6601_card_busy(struct au6601_host *host)
> +{
> +       u8 status;
> +
> +       status = (ioread8(host->iobase + AU6601_REG_BUS_STATUS) &
> +               AU6601_BUS_STAT_DAT_MASK);
> +       /* If all data lines are up, then card is not busy */
> +       if (status == (AU6601_BUS_STAT_DAT0 | AU6601_BUS_STAT_DAT1 |
> +                      AU6601_BUS_STAT_DAT2 | AU6601_BUS_STAT_DAT3))

If all lines have to be up, shouldn't it be "&" instead of "|" ?

> +               return 0;
> +
> +       return 1;
> +}
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