Hi Jeff,
2011/1/7 <mkl0301@xxxxxxxxx>:
> From: Mac Lin <mkl0301@xxxxxxxxx>
>
> CNS3xxx override the softreset function of ahci_platform ahci_softreset by
> cns3xxx_ahci_softreset, which would retry ahci_do_softreset again with pmp=0 if
> pmp=15 failed, for the controller has problem receiving D2H Reg FIS of the
> different PMP setting of the previous sent H2D Reg FIS.
>
> Following describe the isssue with original ahci_platform driver on
> linux-2.6.37-rc3, arm/cns3xxx.
>
> If CONFIG_SATA_PMP is enabled, while not using multiplier and connect the disks
> directly to the board, the disk cannot be found due to software reset always
> failed.
>
> ahci ahci.0: forcing PORTS_IMPL to 0x3
> ahci ahci.0: AHCI 0001.0100 32 slots 2 ports 3 Gbps 0x3 impl platform mode
> ahci ahci.0: flags: ncq sntf pm led clo only pmp pio slum part ccc
> scsi0 : ahci_platform
> scsi1 : ahci_platform
> ata1: SATA max UDMA/133 irq_stat 0x00400040, connection status changed irq 65
> ata2: SATA max UDMA/133 mmio [mem 0x83000000-0x83ffffff] port 0x180 irq 65
> ata2: SATA link down (SStatus 0 SControl 300)
> ata1: link is slow to respond, please be patient (ready=0)
> ata1: softreset failed (device not ready)
> ata1: link is slow to respond, please be patient (ready=0)
> ata1: softreset failed (device not ready)
> ata1: link is slow to respond, please be patient (ready=0)
> ata1: softreset failed (device not ready)
> ata1: limiting SATA link speed to 1.5 Gbps
> ata1: SATA link down (SStatus 1 SControl 310)
>
> While using multiplier with CONFIG_SATA_PMP enabled, or using disks directly
> without CONFIG_SATA_PMP have no issue. It seems the device is sending D2H Reg
> FIS, but controller is not reflecting it on any known means.
>
> Signed-off-by: Mac Lin <mkl0301@xxxxxxxxx>
> ---
> arch/arm/mach-cns3xxx/devices.c | 2 +-
> drivers/ata/Kconfig | 11 +++++++++++
> drivers/ata/ahci_platform.c | 39 +++++++++++++++++++++++++++++++++++++++
> 3 files changed, 51 insertions(+), 1 deletions(-)
>
> diff --git a/arch/arm/mach-cns3xxx/devices.c b/arch/arm/mach-cns3xxx/devices.c
> index 50b4d31..b496f02 100644
> --- a/arch/arm/mach-cns3xxx/devices.c
> +++ b/arch/arm/mach-cns3xxx/devices.c
> @@ -40,7 +40,7 @@ static struct resource cns3xxx_ahci_resource[] = {
> static u64 cns3xxx_ahci_dmamask = DMA_BIT_MASK(32);
>
> static struct platform_device cns3xxx_ahci_pdev = {
> - .name = "ahci",
> + .name = "ahci-cns3xxx",
> .id = 0,
> .resource = cns3xxx_ahci_resource,
> .num_resources = ARRAY_SIZE(cns3xxx_ahci_resource),
> diff --git a/drivers/ata/Kconfig b/drivers/ata/Kconfig
> index 36e2319..5d8b1a3 100644
> --- a/drivers/ata/Kconfig
> +++ b/drivers/ata/Kconfig
> @@ -75,6 +75,17 @@ config SATA_AHCI_PLATFORM
>
> If unsure, say N.
>
> +config SATA_AHCI_CNS3XXX
> + bool "AHCI Support on the Cavium Networks CNS3xxx SOC"
> + depends on ARCH_CNS3XXX
> + depends on SATA_AHCI_PLATFORM
> + help
> + This option enables AHCI platform driver to support CNS3xxx
> + System-on-Chip devices. This is only needed when using CNS3xxx AHCI
> + controller.
> +
> + If unsure, say N.
> +
> config SATA_FSL
> tristate "Freescale 3.0Gbps SATA support"
> depends on FSL_SOC
> diff --git a/drivers/ata/ahci_platform.c b/drivers/ata/ahci_platform.c
> index 25d98c8..7d6957f 100644
> --- a/drivers/ata/ahci_platform.c
> +++ b/drivers/ata/ahci_platform.c
> @@ -176,8 +176,47 @@ static int __devexit ahci_remove(struct platform_device *pdev)
> return 0;
> }
>
> +#ifdef CONFIG_SATA_AHCI_CNS3XXX
> +/*
> + * TODO: move cns3xxx_ahci_init to here after cns3xxx_pwr*() calls are
> + * thread-safe
> + */
> +
> +static int cns3xxx_ahci_softreset(struct ata_link *link, unsigned int *class,
> + unsigned long deadline)
> +{
> + int pmp = sata_srst_pmp(link);
> + int ret;
> +
> + ret = ahci_do_softreset(link, class, pmp, deadline, ahci_check_ready);
> + if (pmp && ret)
> + return ahci_do_softreset(link, class, 0, deadline,
> + ahci_check_ready);
> + return ret;
> +}
> +
> +static struct ata_port_operations cns3xxx_ahci_ops = {
> + .inherits = &ahci_ops,
> + .softreset = cns3xxx_ahci_softreset,
> +};
> +
> +static const struct ata_port_info cns3xxx_ata_port_info = {
> + .flags = AHCI_FLAG_COMMON,
> + .pio_mask = ATA_PIO4,
> + .udma_mask = ATA_UDMA6,
> + .port_ops = &cns3xxx_ahci_ops,
> +};
> +
> +struct ahci_platform_data cns3xxx_ahci_platform_data = {
> + .ata_port_info = &cns3xxx_ata_port_info,
> +};
> +#endif
> +
> static const struct platform_device_id ahci_pltfm_ids[] = {
> { "ahci", },
> +#ifdef CONFIG_SATA_AHCI_CNS3XXX
> + { "ahci-cns3xxx", (kernel_ulong_t)&cns3xxx_ahci_platform_data},
> +#endif
> { },
> };
> MODULE_DEVICE_TABLE(platform, ahci_pltfm_ids);
> --
> 1.7.3
>
>
The code is less readable with macro here and there. It would be more
complicated if more SoC-specific code added.
I really prefer the original way.
Best Regards,
Mac Lin
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