Re: [PATCH v5] mmc: OCTEON: Add host driver for OCTEON MMC controller

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On 10 February 2016 at 18:36, Matt Redfearn <matt.redfearn@xxxxxxxxxx> wrote:
> From: Aleksey Makarov <aleksey.makarov@xxxxxxxxxxxxxxxxxx>
>
> The OCTEON MMC controller is currently found on cn61XX and cnf71XX
> devices.  Device parameters are configured from device tree data.
>
> eMMC, MMC and SD devices are supported.
>
> Tested-by: Aaro Koskinen <aaro.koskinen@xxxxxx>
> Signed-off-by: Chandrakala Chavva <cchavva@xxxxxxxxxxxxxxxxxx>
> Signed-off-by: David Daney <david.daney@xxxxxxxxxx>
> Signed-off-by: Aleksey Makarov <aleksey.makarov@xxxxxxxxxx>
> Signed-off-by: Leonid Rosenboim <lrosenboim@xxxxxxxxxxxxxxxxxx>
> Signed-off-by: Peter Swain <pswain@xxxxxxxxxx>
> Signed-off-by: Aaron Williams <aaron.williams@xxxxxxxxxx>
> Signed-off-by: Matt Redfearn <matt.redfearn@xxxxxxxxxx>
> ---
> v5:
> Incoroprate comments from review
> http://patchwork.linux-mips.org/patch/9558/
> - Use standard <bus-width> property instead of <cavium,bus-max-width>.
> - Use standard <max-frequency> property instead of <spi-max-frequency>.
> - Add octeon_mmc_of_parse_legacy function to deal with the above
>   properties, since many devices have shipped with those properties
>   embedded in firmware.
> - Allow the <vmmc-supply> binding in addition to the legacy
>   <gpios-power>.
> - Remove the secondary driver for each slot.
> - Use core gpio cd/wp handling

Seems like you decided to ignore most comments realted to the DT
bindings from the earlier version.
Although, let's discuss this one more time.

Therefore I recomend you to split this patch. DT documentation should
be a separate patch preceeding the actual mmc driver patch.
The DT patch needs to be acked by the DT maintainers.

Until we somewhat agreed on the DT parts, I am going to defer the
in-depth review of the driver code as I have limited bandwidth.

Does that make sense to you?

Kind regards
Uffe

>
> Tested on Rhino labs UTM8, Cavium CN7130.
>
> For reference, the binding in the shipped devices is:
> mmc: mmc@1180000002000 {
>         compatible = "cavium,octeon-6130-mmc";
>         reg = <0x11800 0x00002000 0x0 0x100>,
>                 <0x11800 0x00000168 0x0 0x20>;
>         #address-cells = <1>;
>         #size-cells = <0>;
>         /* EMM irq, DMA irq */
>         interrupts = <1 19>, <0 63>;
>
>         /* The board only has a single MMC slot */
>         mmc-slot@2 {
>                 compatible = "cavium,octeon-6130-mmc-slot";
>                 reg = <2>;
>                 voltage-ranges = <3300 3300>;
>                 spi-max-frequency = <26000000>;
>                 /* Power on GPIO 8, active high */
>                 /* power-gpios = <&gpio 8 0>; */
>                 power-gpios = <&gpio 8 1>;
>
>         /*      spi-max-frequency = <52000000>; */
>                 /* bus width can be 1, 4 or 8 */
>                 cavium,bus-max-width = <8>;
>         };
>         mmc-slot@0 {
>                 compatible = "cavium,octeon-6130-mmc-slot";
>                 reg = <0>;
>                 voltage-ranges = <3300 3300>;
>                 spi-max-frequency = <26000000>;
>                 /* non-removable; */
>                 bus-width = <8>;
>                 /* bus width can be 1, 4 or 8 */
>                 cavium,bus-max-width = <8>;
>         };
> };
>
> v3:
> https://lkml.kernel.org/g/<1425567033-31236-1-git-send-email-aleksey.makarov@xxxxxxxxxx>
>
> Changes in v4:
> - The sparse error discovered by Aaro Koskinen has been fixed
> - Other sparse warnings have been silenced
>
> Changes in v3:
> - Rebased to v4.0-rc2
> - Use gpiod_*() functions instead of legacy gpio
> - Cosmetic changes
>
> Changes in v2: All the fixes suggested by Mark Rutland were implemented:
> - Device tree parsing has been fixed
> - Device tree docs have been fixed
> - Comment about errata workaroud has been added
> ---
>  .../devicetree/bindings/mmc/octeon-mmc.txt         |   80 ++
>  drivers/mmc/host/Kconfig                           |   10 +
>  drivers/mmc/host/Makefile                          |    1 +
>  drivers/mmc/host/octeon_mmc.c                      | 1409 ++++++++++++++++++++
>  4 files changed, 1500 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/mmc/octeon-mmc.txt
>  create mode 100644 drivers/mmc/host/octeon_mmc.c
>
> diff --git a/Documentation/devicetree/bindings/mmc/octeon-mmc.txt b/Documentation/devicetree/bindings/mmc/octeon-mmc.txt
> new file mode 100644
> index 000000000000..a1b20753172f
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mmc/octeon-mmc.txt
> @@ -0,0 +1,80 @@
> +* OCTEON SD/MMC Host Controller
> +
> +This controller is present on some members of the Cavium OCTEON SoC
> +family, provide an interface for eMMC, MMC and SD devices.  There is a
> +single controller that may have several "slots" connected.  These
> +slots appear as children of the main controller node.
> +The DMA engine is an integral part of the controller block.
> +
> +1) MMC node
> +
> +Required properties:
> +- compatible : Should be "cavium,octeon-6130-mmc" or "cavium,octeon-7890-mmc"
> +- reg : Two entries:
> +       1) The base address of the MMC controller register bank.
> +       2) The base address of the MMC DMA engine register bank.
> +- interrupts :
> +       For "cavium,octeon-6130-mmc": two entries:
> +       1) The MMC controller interrupt line.
> +       2) The MMC DMA engine interrupt line.
> +       For "cavium,octeon-7890-mmc": nine entries:
> +       1) The next block transfer of a multiblock transfer has completed (BUF_DONE)
> +       2) Operation completed successfully (CMD_DONE).
> +       3) DMA transfer completed successfully (DMA_DONE).
> +       4) Operation encountered an error (CMD_ERR).
> +       5) DMA transfer encountered an error (DMA_ERR).
> +       6) Switch operation completed successfully (SWITCH_DONE).
> +       7) Switch operation encountered an error (SWITCH_ERR).
> +       8) Internal DMA engine request completion interrupt (DONE).
> +       9) Internal DMA FIFO underflow (FIFO).
> +- #address-cells : Must be <1>
> +- #size-cells : Must be <0>
> +
> +The node contains child nodes for each slot that the platform uses.
> +
> +Example:
> +mmc@1180000002000 {
> +       compatible = "cavium,octeon-6130-mmc";
> +       reg = <0x11800 0x00002000 0x0 0x100>,
> +               <0x11800 0x00000168 0x0 0x20>;
> +       #address-cells = <1>;
> +       #size-cells = <0>;
> +       /* EMM irq, DMA irq */
> +       interrupts = <1 19>, <0 63>;
> +
> +       [ child node definitions...]
> +};
> +
> +
> +2) Slot nodes
> +Properties in mmc.txt apply to each slot node that the platform uses.
> +
> +Required properties:
> +- reg : The slot number.
> +
> +Optional properties:
> +- cavium,cmd-clk-skew : the amount of delay (in pS) past the clock edge
> +       to sample the command pin.
> +- cavium,dat-clk-skew : the amount of delay (in pS) past the clock edge
> +       to sample the data pin.
> +
> +Example:
> +       mmc@1180000002000 {
> +               compatible = "cavium,octeon-6130-mmc";
> +               reg = <0x11800 0x00002000 0x0 0x100>,
> +                     <0x11800 0x00000168 0x0 0x20>;
> +               #address-cells = <1>;
> +               #size-cells = <0>;
> +               /* EMM irq, DMA irq */
> +               interrupts = <1 19>, <0 63>;
> +
> +               /* The board only has a single MMC slot */
> +               mmc-slot@0 {
> +                       reg = <0>;
> +                       max-frequency = <20000000>;
> +                       bus-width = <8>;
> +                       vmmc-supply = <&reg_vmmc3>;
> +                       cd-gpios = <&gpio 9 0>;
> +                       wp-gpios = <&gpio 10 0>;
> +               };
> +       };
> diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
> index 1526b8a10b09..8a6c6543e48e 100644
> --- a/drivers/mmc/host/Kconfig
> +++ b/drivers/mmc/host/Kconfig
> @@ -331,6 +331,16 @@ config MMC_SDHCI_IPROC
>
>           If unsure, say N.
>
> +config MMC_OCTEON
> +       tristate "Cavium OCTEON Multimedia Card Interface support"
> +       depends on CAVIUM_OCTEON_SOC
> +       help
> +         This selects Cavium OCTEON Multimedia card Interface.
> +         If you have an OCTEON board with a Multimedia Card slot,
> +         say Y or M here.
> +
> +         If unsure, say N.
> +
>  config MMC_MOXART
>         tristate "MOXART SD/MMC Host Controller support"
>         depends on ARCH_MOXART && MMC
> diff --git a/drivers/mmc/host/Makefile b/drivers/mmc/host/Makefile
> index 3595f83e89dd..e7cacf13a034 100644
> --- a/drivers/mmc/host/Makefile
> +++ b/drivers/mmc/host/Makefile
> @@ -21,6 +21,7 @@ obj-$(CONFIG_MMC_SDHCI_SPEAR) += sdhci-spear.o
>  obj-$(CONFIG_MMC_WBSD)         += wbsd.o
>  obj-$(CONFIG_MMC_AU1X)         += au1xmmc.o
>  obj-$(CONFIG_MMC_MTK)          += mtk-sd.o
> +obj-$(CONFIG_MMC_OCTEON)       += octeon_mmc.o
>  obj-$(CONFIG_MMC_OMAP)         += omap.o
>  obj-$(CONFIG_MMC_OMAP_HS)      += omap_hsmmc.o
>  obj-$(CONFIG_MMC_ATMELMCI)     += atmel-mci.o
> diff --git a/drivers/mmc/host/octeon_mmc.c b/drivers/mmc/host/octeon_mmc.c
> new file mode 100644
> index 000000000000..8e41bffe4d30
> --- /dev/null
> +++ b/drivers/mmc/host/octeon_mmc.c
> @@ -0,0 +1,1409 @@
> +/*
> + * Driver for MMC and SSD cards for Cavium OCTEON SOCs.
> + *
> + * This file is subject to the terms and conditions of the GNU General Public
> + * License.  See the file "COPYING" in the main directory of this archive
> + * for more details.
> + *
> + * Copyright (C) 2012-2015 Cavium Inc.
> + */
> +#include <linux/platform_device.h>
> +#include <linux/of_platform.h>
> +#include <linux/scatterlist.h>
> +#include <linux/interrupt.h>
> +#include <linux/blkdev.h>
> +#include <linux/device.h>
> +#include <linux/module.h>
> +#include <linux/delay.h>
> +#include <linux/init.h>
> +#include <linux/clk.h>
> +#include <linux/err.h>
> +#include <linux/io.h>
> +#include <linux/of.h>
> +
> +#include <linux/mmc/card.h>
> +#include <linux/mmc/host.h>
> +#include <linux/mmc/mmc.h>
> +#include <linux/mmc/sd.h>
> +#include <linux/mmc/slot-gpio.h>
> +#include <net/irda/parameters.h>
> +#include <linux/gpio/consumer.h>
> +#include <linux/regulator/consumer.h>
> +
> +#include <asm/byteorder.h>
> +#include <asm/octeon/octeon.h>
> +#include <asm/octeon/cvmx-mio-defs.h>
> +
> +#define DRV_NAME       "octeon_mmc"
> +
> +#define OCTEON_MAX_MMC                 4
> +
> +#define OCT_MIO_NDF_DMA_CFG            0x00
> +#define OCT_MIO_EMM_DMA_ADR            0x08
> +
> +#define OCT_MIO_EMM_CFG                        0x00
> +#define OCT_MIO_EMM_SWITCH             0x48
> +#define OCT_MIO_EMM_DMA                        0x50
> +#define OCT_MIO_EMM_CMD                        0x58
> +#define OCT_MIO_EMM_RSP_STS            0x60
> +#define OCT_MIO_EMM_RSP_LO             0x68
> +#define OCT_MIO_EMM_RSP_HI             0x70
> +#define OCT_MIO_EMM_INT                        0x78
> +#define OCT_MIO_EMM_INT_EN             0x80
> +#define OCT_MIO_EMM_WDOG               0x88
> +#define OCT_MIO_EMM_SAMPLE             0x90
> +#define OCT_MIO_EMM_STS_MASK           0x98
> +#define OCT_MIO_EMM_RCA                        0xa0
> +#define OCT_MIO_EMM_BUF_IDX            0xe0
> +#define OCT_MIO_EMM_BUF_DAT            0xe8
> +
> +#define CVMX_MIO_BOOT_CTL CVMX_ADD_IO_SEG(0x00011800000000D0ull)
> +
> +struct octeon_mmc_host {
> +       u64     base;
> +       u64     ndf_base;
> +       u64     emm_cfg;
> +       u64     n_minus_one;  /* OCTEON II workaround location */
> +       int     last_slot;
> +
> +       struct semaphore mmc_serializer;
> +       struct mmc_request      *current_req;
> +       unsigned int            linear_buf_size;
> +       void                    *linear_buf;
> +       struct sg_mapping_iter smi;
> +       int sg_idx;
> +       bool dma_active;
> +
> +       struct platform_device  *pdev;
> +       struct gpio_desc *global_pwr_gpiod;
> +       bool dma_err_pending;
> +       bool need_bootbus_lock;
> +       bool big_dma_addr;
> +       bool need_irq_handler_lock;
> +       spinlock_t irq_handler_lock;
> +
> +       struct octeon_mmc_slot  *slot[OCTEON_MAX_MMC];
> +};
> +
> +struct octeon_mmc_slot {
> +       struct mmc_host         *mmc;   /* slot-level mmc_core object */
> +       struct octeon_mmc_host  *host;  /* common hw for all 4 slots */
> +
> +       unsigned int            clock;
> +       unsigned int            sclock;
> +
> +       u64                     cached_switch;
> +       u64                     cached_rca;
> +
> +       unsigned int            cmd_cnt; /* sample delay */
> +       unsigned int            dat_cnt; /* sample delay */
> +
> +       int                     bus_id;
> +
> +       /* Legacy property - in future mmc->supply.vmmc should be used */
> +       struct gpio_desc        *pwr_gpiod;
> +};
> +
> +static int bb_size = 1 << 18;
> +module_param(bb_size, int, S_IRUGO);
> +MODULE_PARM_DESC(bb_size,
> +                "Size of DMA linearizing buffer (max transfer size).");
> +
> +static int ddr = 2;
> +module_param(ddr, int, S_IRUGO);
> +MODULE_PARM_DESC(ddr,
> +                "enable DoubleDataRate clocking: 0=no, 1=always, 2=at spi-max-frequency/2");
> +
> +#if 1
> +#define octeon_mmc_dbg pr_debug
> +#else
> +static inline void octeon_mmc_dbg(const char *s, ...) { }
> +#endif
> +
> +static void octeon_mmc_acquire_bus(struct octeon_mmc_host *host)
> +{
> +       if (host->need_bootbus_lock) {
> +               down(&octeon_bootbus_sem);
> +               /* On cn70XX switch the mmc unit onto the bus. */
> +               if (OCTEON_IS_MODEL(OCTEON_CN70XX))
> +                       cvmx_write_csr(CVMX_MIO_BOOT_CTL, 0);
> +       } else {
> +               down(&host->mmc_serializer);
> +       }
> +}
> +
> +static void octeon_mmc_release_bus(struct octeon_mmc_host *host)
> +{
> +       if (host->need_bootbus_lock)
> +               up(&octeon_bootbus_sem);
> +       else
> +               up(&host->mmc_serializer);
> +}
> +
> +struct octeon_mmc_cr_type {
> +       u8 ctype;
> +       u8 rtype;
> +};
> +
> +/*
> + * The OCTEON MMC host hardware assumes that all commands have fixed
> + * command and response types.  These are correct if MMC devices are
> + * being used.  However, non-MMC devices like SD use command and
> + * response types that are unexpected by the host hardware.
> + *
> + * The command and response types can be overridden by supplying an
> + * XOR value that is applied to the type.  We calculate the XOR value
> + * from the values in this table and the flags passed from the MMC
> + * core.
> + */
> +static struct octeon_mmc_cr_type octeon_mmc_cr_types[] = {
> +       {0, 0},         /* CMD0 */
> +       {0, 3},         /* CMD1 */
> +       {0, 2},         /* CMD2 */
> +       {0, 1},         /* CMD3 */
> +       {0, 0},         /* CMD4 */
> +       {0, 1},         /* CMD5 */
> +       {0, 1},         /* CMD6 */
> +       {0, 1},         /* CMD7 */
> +       {1, 1},         /* CMD8 */
> +       {0, 2},         /* CMD9 */
> +       {0, 2},         /* CMD10 */
> +       {1, 1},         /* CMD11 */
> +       {0, 1},         /* CMD12 */
> +       {0, 1},         /* CMD13 */
> +       {1, 1},         /* CMD14 */
> +       {0, 0},         /* CMD15 */
> +       {0, 1},         /* CMD16 */
> +       {1, 1},         /* CMD17 */
> +       {1, 1},         /* CMD18 */
> +       {3, 1},         /* CMD19 */
> +       {2, 1},         /* CMD20 */
> +       {0, 0},         /* CMD21 */
> +       {0, 0},         /* CMD22 */
> +       {0, 1},         /* CMD23 */
> +       {2, 1},         /* CMD24 */
> +       {2, 1},         /* CMD25 */
> +       {2, 1},         /* CMD26 */
> +       {2, 1},         /* CMD27 */
> +       {0, 1},         /* CMD28 */
> +       {0, 1},         /* CMD29 */
> +       {1, 1},         /* CMD30 */
> +       {1, 1},         /* CMD31 */
> +       {0, 0},         /* CMD32 */
> +       {0, 0},         /* CMD33 */
> +       {0, 0},         /* CMD34 */
> +       {0, 1},         /* CMD35 */
> +       {0, 1},         /* CMD36 */
> +       {0, 0},         /* CMD37 */
> +       {0, 1},         /* CMD38 */
> +       {0, 4},         /* CMD39 */
> +       {0, 5},         /* CMD40 */
> +       {0, 0},         /* CMD41 */
> +       {2, 1},         /* CMD42 */
> +       {0, 0},         /* CMD43 */
> +       {0, 0},         /* CMD44 */
> +       {0, 0},         /* CMD45 */
> +       {0, 0},         /* CMD46 */
> +       {0, 0},         /* CMD47 */
> +       {0, 0},         /* CMD48 */
> +       {0, 0},         /* CMD49 */
> +       {0, 0},         /* CMD50 */
> +       {0, 0},         /* CMD51 */
> +       {0, 0},         /* CMD52 */
> +       {0, 0},         /* CMD53 */
> +       {0, 0},         /* CMD54 */
> +       {0, 1},         /* CMD55 */
> +       {0xff, 0xff},   /* CMD56 */
> +       {0, 0},         /* CMD57 */
> +       {0, 0},         /* CMD58 */
> +       {0, 0},         /* CMD59 */
> +       {0, 0},         /* CMD60 */
> +       {0, 0},         /* CMD61 */
> +       {0, 0},         /* CMD62 */
> +       {0, 0}          /* CMD63 */
> +};
> +
> +struct octeon_mmc_cr_mods {
> +       u8 ctype_xor;
> +       u8 rtype_xor;
> +};
> +
> +/*
> + * The functions below are used for the EMMC-17978 workaround.
> + *
> + * Due to an imperfection in the design of the MMC bus hardware,
> + * the 2nd to last cache block of a DMA read must be locked into the L2 Cache.
> + * Otherwise, data corruption may occur.
> + */
> +
> +static inline void *phys_to_ptr(u64 address)
> +{
> +       return (void *)(address | (1ull<<63)); /* XKPHYS */
> +}
> +
> +/**
> + * Lock a single line into L2. The line is zeroed before locking
> + * to make sure no dram accesses are made.
> + *
> + * @addr   Physical address to lock
> + */
> +static void l2c_lock_line(u64 addr)
> +{
> +       char *addr_ptr = phys_to_ptr(addr);
> +
> +       asm volatile (
> +               "cache 31, %[line]"     /* Unlock the line */
> +               :: [line] "m" (*addr_ptr));
> +}
> +
> +/**
> + * Locks a memory region in the L2 cache
> + *
> + * @start - start address to begin locking
> + * @len - length in bytes to lock
> + */
> +static void l2c_lock_mem_region(u64 start, u64 len)
> +{
> +       u64 end;
> +
> +       /* Round start/end to cache line boundaries */
> +       end = ALIGN(start + len - 1, CVMX_CACHE_LINE_SIZE);
> +       start = ALIGN(start, CVMX_CACHE_LINE_SIZE);
> +
> +       while (start <= end) {
> +               l2c_lock_line(start);
> +               start += CVMX_CACHE_LINE_SIZE;
> +       }
> +       asm volatile("sync");
> +}
> +
> +/**
> + * Unlock a single line in the L2 cache.
> + *
> + * @addr       Physical address to unlock
> + *
> + * Return Zero on success
> + */
> +static void l2c_unlock_line(u64 addr)
> +{
> +       char *addr_ptr = phys_to_ptr(addr);
> +
> +       asm volatile (
> +               "cache 23, %[line]"     /* Unlock the line */
> +               :: [line] "m" (*addr_ptr));
> +}
> +
> +/**
> + * Unlock a memory region in the L2 cache
> + *
> + * @start - start address to unlock
> + * @len - length to unlock in bytes
> + */
> +static void l2c_unlock_mem_region(u64 start, u64 len)
> +{
> +       u64 end;
> +
> +       /* Round start/end to cache line boundaries */
> +       end = ALIGN(start + len - 1, CVMX_CACHE_LINE_SIZE);
> +       start = ALIGN(start, CVMX_CACHE_LINE_SIZE);
> +
> +       while (start <= end) {
> +               l2c_unlock_line(start);
> +               start += CVMX_CACHE_LINE_SIZE;
> +       }
> +}
> +
> +static struct octeon_mmc_cr_mods octeon_mmc_get_cr_mods(struct mmc_command *cmd)
> +{
> +       struct octeon_mmc_cr_type *cr;
> +       u8 desired_ctype, hardware_ctype;
> +       u8 desired_rtype, hardware_rtype;
> +       struct octeon_mmc_cr_mods r;
> +
> +       desired_ctype = desired_rtype = 0;
> +
> +       cr = octeon_mmc_cr_types + (cmd->opcode & 0x3f);
> +       hardware_ctype = cr->ctype;
> +       hardware_rtype = cr->rtype;
> +       if (cmd->opcode == 56) { /* CMD56 GEN_CMD */
> +               hardware_ctype = (cmd->arg & 1) ? 1 : 2;
> +       }
> +
> +       switch (mmc_cmd_type(cmd)) {
> +       case MMC_CMD_ADTC:
> +               desired_ctype = (cmd->data->flags & MMC_DATA_WRITE) ? 2 : 1;
> +               break;
> +       case MMC_CMD_AC:
> +       case MMC_CMD_BC:
> +       case MMC_CMD_BCR:
> +               desired_ctype = 0;
> +               break;
> +       }
> +
> +       switch (mmc_resp_type(cmd)) {
> +       case MMC_RSP_NONE:
> +               desired_rtype = 0;
> +               break;
> +       case MMC_RSP_R1:/* MMC_RSP_R5, MMC_RSP_R6, MMC_RSP_R7 */
> +       case MMC_RSP_R1B:
> +               desired_rtype = 1;
> +               break;
> +       case MMC_RSP_R2:
> +               desired_rtype = 2;
> +               break;
> +       case MMC_RSP_R3: /* MMC_RSP_R4 */
> +               desired_rtype = 3;
> +               break;
> +       }
> +       r.ctype_xor = desired_ctype ^ hardware_ctype;
> +       r.rtype_xor = desired_rtype ^ hardware_rtype;
> +       return r;
> +}
> +
> +static bool octeon_mmc_switch_val_changed(struct octeon_mmc_slot *slot,
> +                                         u64 new_val)
> +{
> +       /* Match BUS_ID, HS_TIMING, BUS_WIDTH, POWER_CLASS, CLK_HI, CLK_LO */
> +       u64 m = 0x3001070fffffffffull;
> +
> +       return (slot->cached_switch & m) != (new_val & m);
> +}
> +
> +static unsigned int octeon_mmc_timeout_to_wdog(struct octeon_mmc_slot *slot,
> +                                              unsigned int ns)
> +{
> +       u64 bt = (u64)slot->clock * (u64)ns;
> +
> +       return (unsigned int)(bt / 1000000000);
> +}
> +
> +static irqreturn_t octeon_mmc_interrupt(int irq, void *dev_id)
> +{
> +       struct octeon_mmc_host *host = dev_id;
> +       union cvmx_mio_emm_int emm_int;
> +       struct mmc_request      *req;
> +       bool host_done;
> +       union cvmx_mio_emm_rsp_sts rsp_sts;
> +       unsigned long flags = 0;
> +
> +       if (host->need_irq_handler_lock)
> +               spin_lock_irqsave(&host->irq_handler_lock, flags);
> +       else
> +               __acquire(&host->irq_handler_lock);
> +       emm_int.u64 = cvmx_read_csr(host->base + OCT_MIO_EMM_INT);
> +       req = host->current_req;
> +       cvmx_write_csr(host->base + OCT_MIO_EMM_INT, emm_int.u64);
> +
> +       octeon_mmc_dbg("Got interrupt: EMM_INT = 0x%llx\n", emm_int.u64);
> +
> +       if (!req)
> +               goto out;
> +
> +       rsp_sts.u64 = cvmx_read_csr(host->base + OCT_MIO_EMM_RSP_STS);
> +       octeon_mmc_dbg("octeon_mmc_interrupt  MIO_EMM_RSP_STS 0x%llx\n",
> +               rsp_sts.u64);
> +
> +       if (host->dma_err_pending) {
> +               host->current_req = NULL;
> +               host->dma_err_pending = false;
> +               req->done(req);
> +               host_done = true;
> +               goto no_req_done;
> +       }
> +
> +       if (!host->dma_active && emm_int.s.buf_done && req->data) {
> +               unsigned int type = (rsp_sts.u64 >> 7) & 3;
> +
> +               if (type == 1) {
> +                       /* Read */
> +                       int dbuf = rsp_sts.s.dbuf;
> +                       struct sg_mapping_iter *smi = &host->smi;
> +                       unsigned int data_len =
> +                               req->data->blksz * req->data->blocks;
> +                       unsigned int bytes_xfered;
> +                       u64 dat = 0;
> +                       int shift = -1;
> +
> +                       /* Auto inc from offset zero */
> +                       cvmx_write_csr(host->base + OCT_MIO_EMM_BUF_IDX,
> +                               (u64)(0x10000 | (dbuf << 6)));
> +
> +                       for (bytes_xfered = 0; bytes_xfered < data_len;) {
> +                               if (smi->consumed >= smi->length) {
> +                                       if (!sg_miter_next(smi))
> +                                               break;
> +                                       smi->consumed = 0;
> +                               }
> +                               if (shift < 0) {
> +                                       dat = cvmx_read_csr(host->base +
> +                                               OCT_MIO_EMM_BUF_DAT);
> +                                       shift = 56;
> +                               }
> +
> +                               while (smi->consumed < smi->length &&
> +                                       shift >= 0) {
> +                                       ((u8 *)(smi->addr))[smi->consumed] =
> +                                               (dat >> shift) & 0xff;
> +                                       bytes_xfered++;
> +                                       smi->consumed++;
> +                                       shift -= 8;
> +                               }
> +                       }
> +                       sg_miter_stop(smi);
> +                       req->data->bytes_xfered = bytes_xfered;
> +                       req->data->error = 0;
> +               } else if (type == 2) {
> +                       /* write */
> +                       req->data->bytes_xfered = req->data->blksz *
> +                               req->data->blocks;
> +                       req->data->error = 0;
> +               }
> +       }
> +       host_done = emm_int.s.cmd_done || emm_int.s.dma_done ||
> +               emm_int.s.cmd_err || emm_int.s.dma_err;
> +       if (host_done && req->done) {
> +               if (rsp_sts.s.rsp_bad_sts ||
> +                   rsp_sts.s.rsp_crc_err ||
> +                   rsp_sts.s.rsp_timeout ||
> +                   rsp_sts.s.blk_crc_err ||
> +                   rsp_sts.s.blk_timeout ||
> +                   rsp_sts.s.dbuf_err) {
> +                       req->cmd->error = -EILSEQ;
> +               } else {
> +                       req->cmd->error = 0;
> +               }
> +
> +               if (host->dma_active && req->data) {
> +                       req->data->error = 0;
> +                       req->data->bytes_xfered = req->data->blocks *
> +                               req->data->blksz;
> +                       if (!(req->data->flags & MMC_DATA_WRITE) &&
> +                               req->data->sg_len > 1) {
> +                               size_t r = sg_copy_from_buffer(req->data->sg,
> +                                       req->data->sg_len, host->linear_buf,
> +                                       req->data->bytes_xfered);
> +                               WARN_ON(r != req->data->bytes_xfered);
> +                       }
> +               }
> +               if (rsp_sts.s.rsp_val) {
> +                       u64 rsp_hi;
> +                       u64 rsp_lo = cvmx_read_csr(
> +                               host->base + OCT_MIO_EMM_RSP_LO);
> +
> +                       switch (rsp_sts.s.rsp_type) {
> +                       case 1:
> +                       case 3:
> +                               req->cmd->resp[0] = (rsp_lo >> 8) & 0xffffffff;
> +                               req->cmd->resp[1] = 0;
> +                               req->cmd->resp[2] = 0;
> +                               req->cmd->resp[3] = 0;
> +                               break;
> +                       case 2:
> +                               req->cmd->resp[3] = rsp_lo & 0xffffffff;
> +                               req->cmd->resp[2] = (rsp_lo >> 32) & 0xffffffff;
> +                               rsp_hi = cvmx_read_csr(host->base +
> +                                       OCT_MIO_EMM_RSP_HI);
> +                               req->cmd->resp[1] = rsp_hi & 0xffffffff;
> +                               req->cmd->resp[0] = (rsp_hi >> 32) & 0xffffffff;
> +                               break;
> +                       default:
> +                               octeon_mmc_dbg("octeon_mmc_interrupt unhandled rsp_val %d\n",
> +                                              rsp_sts.s.rsp_type);
> +                               break;
> +                       }
> +                       octeon_mmc_dbg("octeon_mmc_interrupt  resp %08x %08x %08x %08x\n",
> +                                      req->cmd->resp[0], req->cmd->resp[1],
> +                                      req->cmd->resp[2], req->cmd->resp[3]);
> +               }
> +               if (emm_int.s.dma_err && rsp_sts.s.dma_pend) {
> +                       /* Try to clean up failed DMA */
> +                       union cvmx_mio_emm_dma emm_dma;
> +
> +                       emm_dma.u64 =
> +                               cvmx_read_csr(host->base + OCT_MIO_EMM_DMA);
> +                       emm_dma.s.dma_val = 1;
> +                       emm_dma.s.dat_null = 1;
> +                       emm_dma.s.bus_id = rsp_sts.s.bus_id;
> +                       cvmx_write_csr(host->base + OCT_MIO_EMM_DMA,
> +                                      emm_dma.u64);
> +                       host->dma_err_pending = true;
> +                       host_done = false;
> +                       goto no_req_done;
> +               }
> +
> +               host->current_req = NULL;
> +               req->done(req);
> +       }
> +no_req_done:
> +       if (host->n_minus_one) {
> +               l2c_unlock_mem_region(host->n_minus_one, 512);
> +               host->n_minus_one = 0;
> +       }
> +       if (host_done)
> +               octeon_mmc_release_bus(host);
> +out:
> +       if (host->need_irq_handler_lock)
> +               spin_unlock_irqrestore(&host->irq_handler_lock, flags);
> +       else
> +               __release(&host->irq_handler_lock);
> +       return IRQ_RETVAL(emm_int.u64 != 0);
> +}
> +
> +static void octeon_mmc_switch_to(struct octeon_mmc_slot        *slot)
> +{
> +       struct octeon_mmc_host  *host = slot->host;
> +       struct octeon_mmc_slot  *old_slot;
> +       union cvmx_mio_emm_switch sw;
> +       union cvmx_mio_emm_sample samp;
> +
> +       if (slot->bus_id == host->last_slot)
> +               goto out;
> +
> +       if (host->last_slot >= 0 && host->slot[host->last_slot]) {
> +               old_slot = host->slot[host->last_slot];
> +               old_slot->cached_switch =
> +                       cvmx_read_csr(host->base + OCT_MIO_EMM_SWITCH);
> +               old_slot->cached_rca =
> +                       cvmx_read_csr(host->base + OCT_MIO_EMM_RCA);
> +       }
> +       cvmx_write_csr(host->base + OCT_MIO_EMM_RCA, slot->cached_rca);
> +       sw.u64 = slot->cached_switch;
> +       sw.s.bus_id = 0;
> +       cvmx_write_csr(host->base + OCT_MIO_EMM_SWITCH, sw.u64);
> +       sw.s.bus_id = slot->bus_id;
> +       cvmx_write_csr(host->base + OCT_MIO_EMM_SWITCH, sw.u64);
> +
> +       samp.u64 = 0;
> +       samp.s.cmd_cnt = slot->cmd_cnt;
> +       samp.s.dat_cnt = slot->dat_cnt;
> +       cvmx_write_csr(host->base + OCT_MIO_EMM_SAMPLE, samp.u64);
> +out:
> +       host->last_slot = slot->bus_id;
> +}
> +
> +static void octeon_mmc_dma_request(struct mmc_host *mmc,
> +                                  struct mmc_request *mrq)
> +{
> +       struct octeon_mmc_slot  *slot;
> +       struct octeon_mmc_host  *host;
> +       struct mmc_command *cmd;
> +       struct mmc_data *data;
> +       union cvmx_mio_emm_int emm_int;
> +       union cvmx_mio_emm_dma emm_dma;
> +       union cvmx_mio_ndf_dma_cfg dma_cfg;
> +
> +       cmd = mrq->cmd;
> +       if (mrq->data == NULL || mrq->data->sg == NULL || !mrq->data->sg_len ||
> +           mrq->stop == NULL || mrq->stop->opcode != MMC_STOP_TRANSMISSION) {
> +               dev_err(&mmc->card->dev,
> +                       "Error: octeon_mmc_dma_request no data\n");
> +               cmd->error = -EINVAL;
> +               if (mrq->done)
> +                       mrq->done(mrq);
> +               return;
> +       }
> +
> +       slot = mmc_priv(mmc);
> +       host = slot->host;
> +
> +       /* Only a single user of the bootbus at a time. */
> +       octeon_mmc_acquire_bus(host);
> +
> +       octeon_mmc_switch_to(slot);
> +
> +       data = mrq->data;
> +
> +       if (data->timeout_ns) {
> +               cvmx_write_csr(host->base + OCT_MIO_EMM_WDOG,
> +                       octeon_mmc_timeout_to_wdog(slot, data->timeout_ns));
> +               octeon_mmc_dbg("OCT_MIO_EMM_WDOG %llu\n",
> +                       cvmx_read_csr(host->base + OCT_MIO_EMM_WDOG));
> +       }
> +
> +       WARN_ON(host->current_req);
> +       host->current_req = mrq;
> +
> +       host->sg_idx = 0;
> +
> +       WARN_ON(data->blksz * data->blocks > host->linear_buf_size);
> +
> +       if ((data->flags & MMC_DATA_WRITE) && data->sg_len > 1) {
> +               size_t r = sg_copy_to_buffer(data->sg, data->sg_len,
> +                        host->linear_buf, data->blksz * data->blocks);
> +               WARN_ON(data->blksz * data->blocks != r);
> +       }
> +
> +       dma_cfg.u64 = 0;
> +       dma_cfg.s.en = 1;
> +       dma_cfg.s.rw = (data->flags & MMC_DATA_WRITE) ? 1 : 0;
> +#ifdef __LITTLE_ENDIAN
> +       dma_cfg.s.endian = 1;
> +#endif
> +       dma_cfg.s.size = ((data->blksz * data->blocks) / 8) - 1;
> +       if (!host->big_dma_addr) {
> +               if (data->sg_len > 1)
> +                       dma_cfg.s.adr = virt_to_phys(host->linear_buf);
> +               else
> +                       dma_cfg.s.adr = sg_phys(data->sg);
> +       }
> +       cvmx_write_csr(host->ndf_base + OCT_MIO_NDF_DMA_CFG, dma_cfg.u64);
> +       octeon_mmc_dbg("MIO_NDF_DMA_CFG: %016llx\n",
> +               (unsigned long long)dma_cfg.u64);
> +       if (host->big_dma_addr) {
> +               u64 addr;
> +
> +               if (data->sg_len > 1)
> +                       addr = virt_to_phys(host->linear_buf);
> +               else
> +                       addr = sg_phys(data->sg);
> +               cvmx_write_csr(host->ndf_base + OCT_MIO_EMM_DMA_ADR, addr);
> +               octeon_mmc_dbg("MIO_EMM_DMA_ADR: %016llx\n",
> +                       (unsigned long long)addr);
> +       }
> +
> +       emm_dma.u64 = 0;
> +       emm_dma.s.bus_id = slot->bus_id;
> +       emm_dma.s.dma_val = 1;
> +       emm_dma.s.sector = mmc_card_blockaddr(mmc->card) ? 1 : 0;
> +       emm_dma.s.rw = (data->flags & MMC_DATA_WRITE) ? 1 : 0;
> +       if (mmc_card_mmc(mmc->card) ||
> +           (mmc_card_sd(mmc->card) &&
> +               (mmc->card->scr.cmds & SD_SCR_CMD23_SUPPORT)))
> +               emm_dma.s.multi = 1;
> +       emm_dma.s.block_cnt = data->blocks;
> +       emm_dma.s.card_addr = cmd->arg;
> +
> +       emm_int.u64 = 0;
> +       emm_int.s.dma_done = 1;
> +       emm_int.s.cmd_err = 1;
> +       emm_int.s.dma_err = 1;
> +       /* Clear the bit. */
> +       cvmx_write_csr(host->base + OCT_MIO_EMM_INT, emm_int.u64);
> +       cvmx_write_csr(host->base + OCT_MIO_EMM_INT_EN, emm_int.u64);
> +       host->dma_active = true;
> +
> +       if ((OCTEON_IS_MODEL(OCTEON_CN6XXX) ||
> +               OCTEON_IS_MODEL(OCTEON_CNF7XXX)) &&
> +           cmd->opcode == MMC_WRITE_MULTIPLE_BLOCK &&
> +           (data->blksz * data->blocks) > 1024) {
> +               host->n_minus_one = dma_cfg.s.adr +
> +                       (data->blksz * data->blocks) - 1024;
> +               l2c_lock_mem_region(host->n_minus_one, 512);
> +       }
> +
> +       if (mmc->card && mmc_card_sd(mmc->card))
> +               cvmx_write_csr(host->base + OCT_MIO_EMM_STS_MASK,
> +                       0x00b00000ull);
> +       else
> +               cvmx_write_csr(host->base + OCT_MIO_EMM_STS_MASK,
> +                       0xe4f90080ull);
> +       cvmx_write_csr(host->base + OCT_MIO_EMM_DMA, emm_dma.u64);
> +       octeon_mmc_dbg("MIO_EMM_DMA: %llx\n", emm_dma.u64);
> +}
> +
> +static void octeon_mmc_request(struct mmc_host *mmc, struct mmc_request *mrq)
> +{
> +       struct octeon_mmc_slot  *slot;
> +       struct octeon_mmc_host  *host;
> +       struct mmc_command *cmd;
> +       union cvmx_mio_emm_int emm_int;
> +       union cvmx_mio_emm_cmd emm_cmd;
> +       struct octeon_mmc_cr_mods mods;
> +
> +       cmd = mrq->cmd;
> +
> +       if (cmd->opcode == MMC_READ_MULTIPLE_BLOCK ||
> +               cmd->opcode == MMC_WRITE_MULTIPLE_BLOCK) {
> +               octeon_mmc_dma_request(mmc, mrq);
> +               return;
> +       }
> +
> +       mods = octeon_mmc_get_cr_mods(cmd);
> +
> +       slot = mmc_priv(mmc);
> +       host = slot->host;
> +
> +       /* Only a single user of the bootbus at a time. */
> +       octeon_mmc_acquire_bus(host);
> +
> +       octeon_mmc_switch_to(slot);
> +
> +       WARN_ON(host->current_req);
> +       host->current_req = mrq;
> +
> +       emm_int.u64 = 0;
> +       emm_int.s.cmd_done = 1;
> +       emm_int.s.cmd_err = 1;
> +       if (cmd->data) {
> +               octeon_mmc_dbg("command has data\n");
> +               if (cmd->data->flags & MMC_DATA_READ) {
> +                       sg_miter_start(&host->smi, mrq->data->sg,
> +                                      mrq->data->sg_len,
> +                                      SG_MITER_ATOMIC | SG_MITER_TO_SG);
> +               } else {
> +                       struct sg_mapping_iter *smi = &host->smi;
> +                       unsigned int data_len =
> +                               mrq->data->blksz * mrq->data->blocks;
> +                       unsigned int bytes_xfered;
> +                       u64 dat = 0;
> +                       int shift = 56;
> +                       /*
> +                        * Copy data to the xmit buffer before
> +                        * issuing the command
> +                        */
> +                       sg_miter_start(smi, mrq->data->sg,
> +                                      mrq->data->sg_len, SG_MITER_FROM_SG);
> +                       /* Auto inc from offset zero, dbuf zero */
> +                       cvmx_write_csr(host->base + OCT_MIO_EMM_BUF_IDX,
> +                                       0x10000ull);
> +
> +                       for (bytes_xfered = 0; bytes_xfered < data_len;) {
> +                               if (smi->consumed >= smi->length) {
> +                                       if (!sg_miter_next(smi))
> +                                               break;
> +                                       smi->consumed = 0;
> +                               }
> +
> +                               while (smi->consumed < smi->length &&
> +                                       shift >= 0) {
> +
> +                                       dat |= (u64)(((u8 *)(smi->addr))
> +                                               [smi->consumed]) << shift;
> +                                       bytes_xfered++;
> +                                       smi->consumed++;
> +                                       shift -= 8;
> +                               }
> +                               if (shift < 0) {
> +                                       cvmx_write_csr(host->base +
> +                                               OCT_MIO_EMM_BUF_DAT, dat);
> +                                       shift = 56;
> +                                       dat = 0;
> +                               }
> +                       }
> +                       sg_miter_stop(smi);
> +               }
> +               if (cmd->data->timeout_ns) {
> +                       cvmx_write_csr(host->base + OCT_MIO_EMM_WDOG,
> +                               octeon_mmc_timeout_to_wdog(slot,
> +                                       cmd->data->timeout_ns));
> +                       octeon_mmc_dbg("OCT_MIO_EMM_WDOG %llu\n",
> +                                      cvmx_read_csr(host->base +
> +                                               OCT_MIO_EMM_WDOG));
> +               }
> +       } else {
> +               cvmx_write_csr(host->base + OCT_MIO_EMM_WDOG,
> +                              ((u64)slot->clock * 850ull) / 1000ull);
> +               octeon_mmc_dbg("OCT_MIO_EMM_WDOG %llu\n",
> +                              cvmx_read_csr(host->base + OCT_MIO_EMM_WDOG));
> +       }
> +       /* Clear the bit. */
> +       cvmx_write_csr(host->base + OCT_MIO_EMM_INT, emm_int.u64);
> +       cvmx_write_csr(host->base + OCT_MIO_EMM_INT_EN, emm_int.u64);
> +       host->dma_active = false;
> +
> +       emm_cmd.u64 = 0;
> +       emm_cmd.s.cmd_val = 1;
> +       emm_cmd.s.ctype_xor = mods.ctype_xor;
> +       emm_cmd.s.rtype_xor = mods.rtype_xor;
> +       if (mmc_cmd_type(cmd) == MMC_CMD_ADTC)
> +               emm_cmd.s.offset = 64 -
> +                       ((cmd->data->blksz * cmd->data->blocks) / 8);
> +       emm_cmd.s.bus_id = slot->bus_id;
> +       emm_cmd.s.cmd_idx = cmd->opcode;
> +       emm_cmd.s.arg = cmd->arg;
> +       cvmx_write_csr(host->base + OCT_MIO_EMM_STS_MASK, 0);
> +       cvmx_write_csr(host->base + OCT_MIO_EMM_CMD, emm_cmd.u64);
> +       octeon_mmc_dbg("MIO_EMM_CMD: %llx\n", emm_cmd.u64);
> +}
> +
> +static void octeon_mmc_reset_bus(struct octeon_mmc_slot *slot)
> +{
> +       union cvmx_mio_emm_cfg emm_cfg;
> +       union cvmx_mio_emm_switch emm_switch;
> +       u64 wdog = 0;
> +
> +       emm_cfg.u64 = cvmx_read_csr(slot->host->base + OCT_MIO_EMM_CFG);
> +       emm_switch.u64 = cvmx_read_csr(slot->host->base + OCT_MIO_EMM_SWITCH);
> +       wdog = cvmx_read_csr(slot->host->base + OCT_MIO_EMM_WDOG);
> +
> +       emm_switch.s.switch_exe = 0;
> +       emm_switch.s.switch_err0 = 0;
> +       emm_switch.s.switch_err1 = 0;
> +       emm_switch.s.switch_err2 = 0;
> +       emm_switch.s.bus_id = 0;
> +       cvmx_write_csr(slot->host->base + OCT_MIO_EMM_SWITCH, emm_switch.u64);
> +       emm_switch.s.bus_id = slot->bus_id;
> +       cvmx_write_csr(slot->host->base + OCT_MIO_EMM_SWITCH, emm_switch.u64);
> +
> +       slot->cached_switch = emm_switch.u64;
> +
> +       msleep(20);
> +
> +       cvmx_write_csr(slot->host->base + OCT_MIO_EMM_WDOG, wdog);
> +}
> +
> +static void octeon_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
> +{
> +       struct octeon_mmc_slot  *slot;
> +       struct octeon_mmc_host  *host;
> +       int bus_width;
> +       int clock;
> +       bool ddr_clock;
> +       int hs_timing;
> +       int power_class = 10;
> +       int clk_period;
> +       int timeout = 2000;
> +       union cvmx_mio_emm_switch emm_switch;
> +       union cvmx_mio_emm_rsp_sts emm_sts;
> +
> +       slot = mmc_priv(mmc);
> +       host = slot->host;
> +
> +       /* Only a single user of the bootbus at a time. */
> +       octeon_mmc_acquire_bus(host);
> +
> +       octeon_mmc_switch_to(slot);
> +
> +       octeon_mmc_dbg("Calling set_ios: slot: clk = 0x%x, bus_width = %d\n",
> +                      slot->clock, (mmc->caps & MMC_CAP_8_BIT_DATA) ? 8 :
> +                      (mmc->caps & MMC_CAP_4_BIT_DATA) ? 4 : 1);
> +       octeon_mmc_dbg("Calling set_ios: ios: clk = 0x%x, vdd = %u, bus_width = %u, power_mode = %u, timing = %u\n",
> +                      ios->clock, ios->vdd, ios->bus_width, ios->power_mode,
> +                      ios->timing);
> +       octeon_mmc_dbg("Calling set_ios: mmc: caps = 0x%x, bus_width = %d\n",
> +                      mmc->caps, mmc->ios.bus_width);
> +
> +       /*
> +        * Reset the chip on each power off
> +        */
> +       if (ios->power_mode == MMC_POWER_OFF) {
> +               octeon_mmc_reset_bus(slot);
> +               if (!IS_ERR(mmc->supply.vmmc))
> +                       regulator_disable(mmc->supply.vmmc);
> +               else /* Legacy power GPIO */
> +                       gpiod_set_value_cansleep(slot->pwr_gpiod, 0);
> +       } else {
> +               if (!IS_ERR(mmc->supply.vmmc))
> +                       regulator_enable(mmc->supply.vmmc);
> +               else /* Legacy power GPIO */
> +                       gpiod_set_value_cansleep(slot->pwr_gpiod, 1);
> +       }
> +
> +       switch (ios->bus_width) {
> +       case MMC_BUS_WIDTH_8:
> +               bus_width = 2;
> +               break;
> +       case MMC_BUS_WIDTH_4:
> +               bus_width = 1;
> +               break;
> +       case MMC_BUS_WIDTH_1:
> +               bus_width = 0;
> +               break;
> +       default:
> +               octeon_mmc_dbg("unknown bus width %d\n", ios->bus_width);
> +               bus_width = 0;
> +               break;
> +       }
> +
> +       hs_timing = (ios->timing == MMC_TIMING_MMC_HS);
> +       ddr_clock = (bus_width && ios->timing >= MMC_TIMING_UHS_DDR50);
> +
> +       if (ddr_clock)
> +               bus_width |= 4;
> +
> +       if (ios->clock) {
> +               slot->clock = ios->clock;
> +
> +               clock = slot->clock;
> +
> +               if (clock > 52000000)
> +                       clock = 52000000;
> +
> +               clk_period = (octeon_get_io_clock_rate() + clock - 1) /
> +                       (2 * clock);
> +
> +               /* until clock-renengotiate-on-CRC is in */
> +               if (ddr_clock && ddr > 1)
> +                       clk_period *= 2;
> +
> +               emm_switch.u64 = 0;
> +               emm_switch.s.hs_timing = hs_timing;
> +               emm_switch.s.bus_width = bus_width;
> +               emm_switch.s.power_class = power_class;
> +               emm_switch.s.clk_hi = clk_period;
> +               emm_switch.s.clk_lo = clk_period;
> +
> +               if (!octeon_mmc_switch_val_changed(slot, emm_switch.u64)) {
> +                       octeon_mmc_dbg("No change from 0x%llx mio_emm_switch, returning.\n",
> +                                      emm_switch.u64);
> +                       goto out;
> +               }
> +
> +               octeon_mmc_dbg("Writing 0x%llx to mio_emm_wdog\n",
> +                              ((u64)clock * 850ull) / 1000ull);
> +               cvmx_write_csr(host->base + OCT_MIO_EMM_WDOG,
> +                              ((u64)clock * 850ull) / 1000ull);
> +               octeon_mmc_dbg("Writing 0x%llx to mio_emm_switch\n",
> +                               emm_switch.u64);
> +
> +               cvmx_write_csr(host->base + OCT_MIO_EMM_SWITCH, emm_switch.u64);
> +               emm_switch.s.bus_id = slot->bus_id;
> +               cvmx_write_csr(host->base + OCT_MIO_EMM_SWITCH, emm_switch.u64);
> +               slot->cached_switch = emm_switch.u64;
> +
> +               do {
> +                       emm_sts.u64 =
> +                               cvmx_read_csr(host->base + OCT_MIO_EMM_RSP_STS);
> +                       if (!emm_sts.s.switch_val)
> +                               break;
> +                       udelay(100);
> +               } while (timeout-- > 0);
> +
> +               if (timeout <= 0) {
> +                       octeon_mmc_dbg("switch command timed out, status=0x%llx\n",
> +                                      emm_sts.u64);
> +                       goto out;
> +               }
> +       }
> +out:
> +       octeon_mmc_release_bus(host);
> +}
> +
> +static const struct mmc_host_ops octeon_mmc_ops = {
> +       .request        = octeon_mmc_request,
> +       .set_ios        = octeon_mmc_set_ios,
> +       .get_ro         = mmc_gpio_get_ro,
> +       .get_cd         = mmc_gpio_get_cd,
> +};
> +
> +static void octeon_mmc_set_clock(struct octeon_mmc_slot *slot,
> +                                unsigned int clock)
> +{
> +       struct mmc_host *mmc = slot->mmc;
> +
> +       clock = min(clock, mmc->f_max);
> +       clock = max(clock, mmc->f_min);
> +       slot->clock = clock;
> +}
> +
> +static int octeon_mmc_initlowlevel(struct octeon_mmc_slot *slot)
> +{
> +       union cvmx_mio_emm_switch emm_switch;
> +       struct octeon_mmc_host *host = slot->host;
> +
> +       host->emm_cfg |= 1ull << slot->bus_id;
> +       cvmx_write_csr(slot->host->base + OCT_MIO_EMM_CFG, host->emm_cfg);
> +       octeon_mmc_set_clock(slot, 400000);
> +
> +       /* Program initial clock speed and power */
> +       emm_switch.u64 = 0;
> +       emm_switch.s.power_class = 10;
> +       emm_switch.s.clk_hi = (slot->sclock / slot->clock) / 2;
> +       emm_switch.s.clk_lo = (slot->sclock / slot->clock) / 2;
> +
> +       cvmx_write_csr(host->base + OCT_MIO_EMM_SWITCH, emm_switch.u64);
> +       emm_switch.s.bus_id = slot->bus_id;
> +       cvmx_write_csr(host->base + OCT_MIO_EMM_SWITCH, emm_switch.u64);
> +       slot->cached_switch = emm_switch.u64;
> +
> +       cvmx_write_csr(host->base + OCT_MIO_EMM_WDOG,
> +                      ((u64)slot->clock * 850ull) / 1000ull);
> +       cvmx_write_csr(host->base + OCT_MIO_EMM_STS_MASK, 0xe4f90080ull);
> +       cvmx_write_csr(host->base + OCT_MIO_EMM_RCA, 1);
> +       return 0;
> +}
> +
> +static int octeon_mmc_of_copy_legacy_u32(struct device_node *node,
> +                                         const char *legacy_name,
> +                                         const char *new_name)
> +{
> +       u32 value;
> +       int ret;
> +
> +       ret = of_property_read_u32(node, legacy_name, &value);
> +       if (!ret) {
> +               /* Found legacy - set generic property */
> +               struct property *new_p;
> +               u32 *new_v;
> +
> +               pr_warn(FW_WARN "%s: Legacy property '%s'. Please remove\n",
> +                       node->full_name, legacy_name);
> +
> +               new_p = kzalloc(sizeof(*new_p), GFP_KERNEL);
> +               new_v = kzalloc(sizeof(u32), GFP_KERNEL);
> +               if (!new_p || !new_v)
> +                       return -ENOMEM;
> +
> +               *new_v = value;
> +               new_p->name = kstrdup(new_name, GFP_KERNEL);
> +               new_p->length = sizeof(u32);
> +               new_p->value = new_v;
> +
> +               of_update_property(node, new_p);
> +       }
> +       return 0;
> +}
> +
> +/*
> + * This function parses the legacy device tree that may be found in devices
> + * shipped before the driver was upstreamed. Future devices should not require
> + * it as standard bindings should be used
> + */
> +static int octeon_mmc_of_parse_legacy(struct device *dev,
> +                                     struct device_node *node,
> +                                     struct octeon_mmc_slot *slot)
> +{
> +       int ret;
> +
> +       ret = octeon_mmc_of_copy_legacy_u32(node, "cavium,bus-max-width",
> +                                           "bus-width");
> +       if (ret)
> +               return ret;
> +
> +       ret = octeon_mmc_of_copy_legacy_u32(node, "spi-max-frequency",
> +                                           "max-frequency");
> +       if (ret)
> +               return ret;
> +
> +       slot->pwr_gpiod = devm_gpiod_get_optional(dev, "power", GPIOD_OUT_LOW);
> +       if (!IS_ERR(slot->pwr_gpiod)) {
> +               pr_warn(FW_WARN "%s: Legacy property '%s'. Please remove\n",
> +                       node->full_name, "gpios-power");
> +       }
> +
> +       return 0;
> +}
> +
> +static int octeon_mmc_slot_probe(struct platform_device *slot_pdev,
> +                                struct octeon_mmc_host *host)
> +{
> +       struct mmc_host *mmc;
> +       struct octeon_mmc_slot *slot;
> +       struct device *dev = &slot_pdev->dev;
> +       struct device_node *node = slot_pdev->dev.of_node;
> +       u32 id, cmd_skew, dat_skew;
> +       u64 clock_period;
> +       int ret;
> +
> +       ret = of_property_read_u32(node, "reg", &id);
> +       if (ret) {
> +               dev_err(dev, "Missing or invalid reg property on %s\n",
> +                       of_node_full_name(node));
> +               return ret;
> +       }
> +
> +       if (id >= OCTEON_MAX_MMC || host->slot[id]) {
> +               dev_err(dev, "Invalid reg property on %s\n",
> +                       of_node_full_name(node));
> +               return -EINVAL;
> +       }
> +
> +       mmc = mmc_alloc_host(sizeof(struct octeon_mmc_slot), dev);
> +       if (!mmc) {
> +               dev_err(dev, "alloc host failed\n");
> +               return -ENOMEM;
> +       }
> +
> +       slot = mmc_priv(mmc);
> +       slot->mmc = mmc;
> +       slot->host = host;
> +
> +       /* Convert legacy DT entries into things mmc_of_parse can understand */
> +       ret = octeon_mmc_of_parse_legacy(dev, node, slot);
> +       if (ret)
> +               return ret;
> +
> +       ret = mmc_of_parse(mmc);
> +       if (ret) {
> +               dev_err(dev, "Failed to parse DT\n");
> +               return ret;
> +       }
> +
> +       /* Get regulators and the supported OCR mask */
> +       ret = mmc_regulator_get_supply(mmc);
> +       if (ret == -EPROBE_DEFER)
> +               goto err;
> +
> +       /* Octeon specific DT properties */
> +       ret = of_property_read_u32(node, "cavium,cmd-clk-skew", &cmd_skew);
> +       if (ret)
> +               cmd_skew = 0;
> +
> +       ret = of_property_read_u32(node, "cavium,dat-clk-skew", &dat_skew);
> +       if (ret)
> +               dat_skew = 0;
> +
> +       /*
> +        * Set up host parameters.
> +        */
> +       mmc->ops = &octeon_mmc_ops;
> +       mmc->f_min = 400000;
> +       if (!mmc->f_max) {
> +               mmc->f_max = 52000000;
> +               dev_info(dev, "No max-frequency for slot %u, defaulting to %u\n",
> +                       id, mmc->f_max);
> +       }
> +
> +       mmc->caps |= MMC_CAP_MMC_HIGHSPEED | MMC_CAP_SD_HIGHSPEED |
> +                   MMC_CAP_ERASE;
> +       mmc->ocr_avail = MMC_VDD_27_28 | MMC_VDD_28_29 | MMC_VDD_29_30 |
> +                        MMC_VDD_30_31 | MMC_VDD_31_32 | MMC_VDD_32_33 |
> +                        MMC_VDD_33_34 | MMC_VDD_34_35 | MMC_VDD_35_36;
> +
> +       /* post-sdk23 caps */
> +       mmc->caps |=
> +               ((mmc->f_max >= 12000000) * MMC_CAP_UHS_SDR12) |
> +               ((mmc->f_max >= 25000000) * MMC_CAP_UHS_SDR25) |
> +               ((mmc->f_max >= 50000000) * MMC_CAP_UHS_SDR50) |
> +               MMC_CAP_CMD23;
> +
> +       if ((!IS_ERR(mmc->supply.vmmc)) || (slot->pwr_gpiod))
> +               mmc->caps |= MMC_CAP_POWER_OFF_CARD;
> +
> +       /* "1.8v" capability is actually 1.8-or-3.3v */
> +       if (ddr)
> +               mmc->caps |= MMC_CAP_UHS_DDR50 | MMC_CAP_1_8V_DDR;
> +
> +       mmc->max_segs = 64;
> +       mmc->max_seg_size = host->linear_buf_size;
> +       mmc->max_req_size = host->linear_buf_size;
> +       mmc->max_blk_size = 512;
> +       mmc->max_blk_count = mmc->max_req_size / 512;
> +
> +       slot->clock = mmc->f_min;
> +       slot->sclock = octeon_get_io_clock_rate();
> +
> +       clock_period = 1000000000000ull / slot->sclock; /* period in pS */
> +       slot->cmd_cnt = (cmd_skew + clock_period / 2) / clock_period;
> +       slot->dat_cnt = (dat_skew + clock_period / 2) / clock_period;
> +
> +       slot->bus_id = id;
> +       slot->cached_rca = 1;
> +
> +       /* Only a single user of the bootbus at a time. */
> +       octeon_mmc_acquire_bus(host);
> +       host->slot[id] = slot;
> +
> +       octeon_mmc_switch_to(slot);
> +       /* Initialize MMC Block. */
> +       octeon_mmc_initlowlevel(slot);
> +
> +       octeon_mmc_release_bus(host);
> +
> +       ret = mmc_add_host(mmc);
> +       if (ret) {
> +               dev_err(dev, "mmc_add_host() returned %d\n", ret);
> +               goto err;
> +       }
> +
> +       return 0;
> +
> +err:
> +       slot->host->slot[id] = NULL;
> +
> +       gpiod_set_value_cansleep(slot->pwr_gpiod, 0);
> +
> +       mmc_free_host(slot->mmc);
> +       return ret;
> +}
> +
> +static int octeon_mmc_slot_remove(struct octeon_mmc_slot *slot)
> +{
> +       mmc_remove_host(slot->mmc);
> +
> +       slot->host->slot[slot->bus_id] = NULL;
> +
> +       gpiod_set_value_cansleep(slot->pwr_gpiod, 0);
> +
> +       mmc_free_host(slot->mmc);
> +
> +       return 0;
> +}
> +
> +static int octeon_mmc_probe(struct platform_device *pdev)
> +{
> +       struct octeon_mmc_host *host;
> +       struct resource *res;
> +       void __iomem *base;
> +       int mmc_irq[9];
> +       int i;
> +       int ret = 0;
> +       struct device_node *node = pdev->dev.of_node;
> +       struct device_node *cn;
> +       bool cn78xx_style;
> +       u64 t;
> +
> +       host = devm_kzalloc(&pdev->dev, sizeof(*host), GFP_KERNEL);
> +       if (!host)
> +               return -ENOMEM;
> +
> +       spin_lock_init(&host->irq_handler_lock);
> +       sema_init(&host->mmc_serializer, 1);
> +
> +       cn78xx_style = of_device_is_compatible(node, "cavium,octeon-7890-mmc");
> +       if (cn78xx_style) {
> +               host->need_bootbus_lock = false;
> +               host->big_dma_addr = true;
> +               host->need_irq_handler_lock = true;
> +               /*
> +                * First seven are the EMM_INT bits 0..6, then two for
> +                * the EMM_DMA_INT bits
> +                */
> +               for (i = 0; i < 9; i++) {
> +                       mmc_irq[i] = platform_get_irq(pdev, i);
> +                       if (mmc_irq[i] < 0)
> +                               return mmc_irq[i];
> +               }
> +       } else {
> +               host->need_bootbus_lock = true;
> +               host->big_dma_addr = false;
> +               host->need_irq_handler_lock = false;
> +               /* First one is EMM second NDF_DMA */
> +               for (i = 0; i < 2; i++) {
> +                       mmc_irq[i] = platform_get_irq(pdev, i);
> +                       if (mmc_irq[i] < 0)
> +                               return mmc_irq[i];
> +               }
> +       }
> +       host->last_slot = -1;
> +
> +       if (bb_size < 512 || bb_size >= (1 << 24))
> +               bb_size = 1 << 18;
> +       host->linear_buf_size = bb_size;
> +       host->linear_buf = devm_kzalloc(&pdev->dev, host->linear_buf_size,
> +                                       GFP_KERNEL);
> +
> +       if (!host->linear_buf) {
> +               dev_err(&pdev->dev, "devm_kzalloc failed\n");
> +               return -ENOMEM;
> +       }
> +
> +       host->pdev = pdev;
> +
> +       res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +       if (!res) {
> +               dev_err(&pdev->dev, "Platform resource[0] is missing\n");
> +               return -ENXIO;
> +       }
> +       base = devm_ioremap_resource(&pdev->dev, res);
> +       if (IS_ERR(base))
> +               return PTR_ERR(base);
> +       host->base = (__force u64)base;
> +
> +       res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
> +       if (!res) {
> +               dev_err(&pdev->dev, "Platform resource[1] is missing\n");
> +               return -EINVAL;
> +       }
> +       base = devm_ioremap_resource(&pdev->dev, res);
> +       if (IS_ERR(base))
> +               return PTR_ERR(base);
> +       host->ndf_base = (__force u64)base;
> +       /*
> +        * Clear out any pending interrupts that may be left over from
> +        * bootloader.
> +        */
> +       t = cvmx_read_csr(host->base + OCT_MIO_EMM_INT);
> +       cvmx_write_csr(host->base + OCT_MIO_EMM_INT, t);
> +       if (cn78xx_style) {
> +               /* Only CMD_DONE, DMA_DONE, CMD_ERR, DMA_ERR */
> +               for (i = 1; i <= 4; i++) {
> +                       ret = devm_request_irq(&pdev->dev, mmc_irq[i],
> +                                              octeon_mmc_interrupt,
> +                                              0, DRV_NAME, host);
> +                       if (ret < 0) {
> +                               dev_err(&pdev->dev, "Error: devm_request_irq %d\n",
> +                                       mmc_irq[i]);
> +                               return ret;
> +                       }
> +               }
> +       } else {
> +               ret = devm_request_irq(&pdev->dev, mmc_irq[0],
> +                                      octeon_mmc_interrupt, 0, DRV_NAME, host);
> +               if (ret < 0) {
> +                       dev_err(&pdev->dev, "Error: devm_request_irq %d\n",
> +                               mmc_irq[0]);
> +                       return ret;
> +               }
> +       }
> +
> +       host->global_pwr_gpiod = devm_gpiod_get_optional(&pdev->dev, "power",
> +                                                               GPIOD_OUT_HIGH);
> +       if (IS_ERR(host->global_pwr_gpiod)) {
> +               dev_err(&host->pdev->dev, "Invalid POWER GPIO\n");
> +               return PTR_ERR(host->global_pwr_gpiod);
> +       }
> +
> +       platform_set_drvdata(pdev, host);
> +
> +       for_each_child_of_node(node, cn) {
> +               struct platform_device *slot_pdev;
> +
> +               slot_pdev = of_platform_device_create(cn, NULL, &pdev->dev);
> +               ret = octeon_mmc_slot_probe(slot_pdev, host);
> +               if (ret) {
> +                       dev_err(&host->pdev->dev, "Error populating slots\n");
> +                       gpiod_set_value_cansleep(host->global_pwr_gpiod, 0);
> +                       return ret;
> +               }
> +       }
> +
> +       return 0;
> +}
> +
> +static int octeon_mmc_remove(struct platform_device *pdev)
> +{
> +       union cvmx_mio_ndf_dma_cfg ndf_dma_cfg;
> +       struct octeon_mmc_host *host = platform_get_drvdata(pdev);
> +       int i;
> +
> +       for (i = 0; i < OCTEON_MAX_MMC; i++) {
> +               if (host->slot[i])
> +                       octeon_mmc_slot_remove(host->slot[i]);
> +       }
> +
> +       ndf_dma_cfg.u64 = cvmx_read_csr(host->ndf_base + OCT_MIO_NDF_DMA_CFG);
> +       ndf_dma_cfg.s.en = 0;
> +       cvmx_write_csr(host->ndf_base + OCT_MIO_NDF_DMA_CFG, ndf_dma_cfg.u64);
> +
> +       gpiod_set_value_cansleep(host->global_pwr_gpiod, 0);
> +
> +       return 0;
> +}
> +
> +static const struct of_device_id octeon_mmc_match[] = {
> +       {
> +               .compatible = "cavium,octeon-6130-mmc",
> +       },
> +       {
> +               .compatible = "cavium,octeon-7890-mmc",
> +       },
> +       {},
> +};
> +MODULE_DEVICE_TABLE(of, octeon_mmc_match);
> +
> +static struct platform_driver octeon_mmc_driver = {
> +       .probe          = octeon_mmc_probe,
> +       .remove         = octeon_mmc_remove,
> +       .driver         = {
> +               .name   = DRV_NAME,
> +               .of_match_table = octeon_mmc_match,
> +       },
> +};
> +
> +static int __init octeon_mmc_init(void)
> +{
> +       return platform_driver_register(&octeon_mmc_driver);
> +}
> +
> +static void __exit octeon_mmc_cleanup(void)
> +{
> +       platform_driver_unregister(&octeon_mmc_driver);
> +}
> +
> +module_init(octeon_mmc_init);
> +module_exit(octeon_mmc_cleanup);
> +
> +MODULE_AUTHOR("Cavium Inc. <support@xxxxxxxxxx>");
> +MODULE_DESCRIPTION("low-level driver for Cavium OCTEON MMC/SSD card");
> +MODULE_LICENSE("GPL");
> --
> 2.5.0
>
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