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Message-ID: <CAGzjT4eLGYjLd3WKLaxVK-S7p+d4jndAuvdJJTvMp7ZvZrqG0A@mail.gmail.com>
Date: Tue, 24 Jan 2012 21:34:09 +0100
From: Jaccon Bastiaansen <jaccon.bastiaansen@...il.com>
To: Sascha Hauer <s.hauer@...gutronix.de>
Cc: kernel@...gutronix.de, u.kleine-koenig@...gutronix.de,
davem@...emloft.net, cavokz@...il.com, linux@....linux.org.uk,
linux-arm-kernel@...ts.infradead.org, netdev@...r.kernel.org
Subject: Re: [PATCH V4 2/4] CS89x0 : add CS89x0 platform device to the
iMX21ADS board
2012/1/24 Sascha Hauer <s.hauer@...gutronix.de>:
> On Tue, Jan 24, 2012 at 12:34:24AM +0100, Jaccon Bastiaansen wrote:
>> Hello Sascha,
>>
>> 2012/1/23 Sascha Hauer <s.hauer@...gutronix.de>:
>> > On Thu, Jan 19, 2012 at 07:13:50PM +0100, Jaccon Bastiaansen wrote:
>> >> Add CS89x0 networking support to the iMX21ADS board by using the
>> >> platform driver support in the CS89x0 driver.
>> >>
>> >> Signed-off-by: Jaccon Bastiaansen <jaccon.bastiaansen@...il.com>
>> >> ---
>> >> arch/arm/configs/imx_v4_v5_defconfig | 2 ++
>> >> arch/arm/mach-imx/mach-mx21ads.c | 31 ++++++++++++++++++++++++++++---
>> >> 2 files changed, 30 insertions(+), 3 deletions(-)
>> >>
>> >> diff --git a/arch/arm/configs/imx_v4_v5_defconfig b/arch/arm/configs/imx_v4_v5_defconfig
>> >> index 11a4192..fc0106f 100644
>> >> --- a/arch/arm/configs/imx_v4_v5_defconfig
>> >> +++ b/arch/arm/configs/imx_v4_v5_defconfig
>> >> @@ -81,6 +81,8 @@ CONFIG_NET_ETHERNET=y
>> >> CONFIG_SMC91X=y
>> >> CONFIG_DM9000=y
>> >> CONFIG_SMC911X=y
>> >> +CONFIG_CS89x0=y
>> >> +CONFIG_CS89x0_PLATFORM=y
>> >> # CONFIG_NETDEV_1000 is not set
>> >> # CONFIG_NETDEV_10000 is not set
>> >> # CONFIG_INPUT_MOUSEDEV is not set
>> >> diff --git a/arch/arm/mach-imx/mach-mx21ads.c b/arch/arm/mach-imx/mach-mx21ads.c
>> >> index 25f8402..4fd37fc 100644
>> >> --- a/arch/arm/mach-imx/mach-mx21ads.c
>> >> +++ b/arch/arm/mach-imx/mach-mx21ads.c
>> >> @@ -37,8 +37,8 @@
>> >> #define MX21ADS_REG_ADDR(offset) (void __force __iomem *) \
>> >> (MX21ADS_MMIO_BASE_ADDR + (offset))
>> >>
>> >> +#define MX21ADS_CS8900A_MMIO_SIZE 0x200000
>> >> #define MX21ADS_CS8900A_IRQ IRQ_GPIOE(11)
>> >> -#define MX21ADS_CS8900A_IOBASE_REG MX21ADS_REG_ADDR(0x000000)
>> >> #define MX21ADS_ST16C255_IOBASE_REG MX21ADS_REG_ADDR(0x200000)
>> >> #define MX21ADS_VERSION_REG MX21ADS_REG_ADDR(0x400000)
>> >> #define MX21ADS_IO_REG MX21ADS_REG_ADDR(0x800000)
>> >> @@ -159,6 +159,26 @@ static struct platform_device mx21ads_nor_mtd_device = {
>> >> .resource = &mx21ads_flash_resource,
>> >> };
>> >>
>> >> +static const struct resource mx21ads_cs8900_resources[] __initconst = {
>> >> + {
>> >> + .start = MX21_CS1_BASE_ADDR,
>> >> + .end = MX21_CS1_BASE_ADDR + MX21ADS_CS8900A_MMIO_SIZE - 1,
>> >> + .flags = IORESOURCE_MEM,
>> >> + },
>> >> + {
>> >> + .start = MX21ADS_CS8900A_IRQ,
>> >> + .end = MX21ADS_CS8900A_IRQ,
>> >> + .flags = IORESOURCE_IRQ,
>> >> + }
>> >> +};
>> >> +
>> >> +static const struct platform_device_info mx21ads_cs8900_devinfo __initconst = {
>> >> + .name = "cs89x0",
>> >> + .id = 0,
>> >> + .res = mx21ads_cs8900_resources,
>> >> + .num_res = ARRAY_SIZE(mx21ads_cs8900_resources),
>> >> +};
>> >> +
>> >> static const struct imxuart_platform_data uart_pdata_rts __initconst = {
>> >> .flags = IMXUART_HAVE_RTSCTS,
>> >> };
>> >> @@ -254,14 +274,17 @@ mx21ads_nand_board_info __initconst = {
>> >> static struct map_desc mx21ads_io_desc[] __initdata = {
>> >> /*
>> >> * Memory-mapped I/O on MX21ADS Base board:
>> >> - * - CS8900A Ethernet controller
>> >> * - ST16C2552CJ UART
>> >> * - CPU and Base board version
>> >> * - Base board I/O register
>> >> + *
>> >> + * Note that the CS8900 uses the first MX21ADS_CS8900A_MMIO_SIZE
>> >> + * bytes of the CS1 memory range.
>> >> */
>> >> {
>> >> .virtual = MX21ADS_MMIO_BASE_ADDR,
>> >> - .pfn = __phys_to_pfn(MX21_CS1_BASE_ADDR),
>> >> + .pfn = __phys_to_pfn(MX21_CS1_BASE_ADDR +
>> >> + MX21ADS_CS8900A_MMIO_SIZE),
>> >
>> > Since you now use ioremap the cs89x0 driver this mapping is not used
>> > for the cs89x0 anymore, so it's strange to have references to it
>> > here.
>> > You still need the mapping though, but only for MX21ADS_IO_REG.
>> >
>>
>> The ST16C255 UART is the first peripheral in the CS1 memory range for
>> which this fixed mapping is now required. I could create another
>> constant (for example: MX21ADS_ST16C255_OFFSET) to indicate the offset
>> in the CS1 memory range where the mapping should start. But since that
>> would create another constant with the same value as
>> MX21ADS_CS8900A_MMIO_SIZE, I decided to use MX21ADS_CS8900A_MMIO_SIZE.
>>
>> Do you prefer to a constant with another name here?
>
> Ok, looking again at it I understand what you are doing here and it
> seems wrong. Instead of mapping MX21_CS1_BASE_ADDR you now map
> MX21_CS1_BASE_ADDR + MX21ADS_CS8900A_MMIO_SIZE. This means that the
> offset to MX21ADS_IO_REG is no longer 0x800000 but
> 0x800000 - MX21ADS_CS8900A_MMIO_SIZE.
> Please just keep the mapping like it was before, it won't hurt.
> BTW the 8250 serial driver also ioremaps the memory if you add
> UPF_IOREMAP to the platform data.
>
> Sascha
>
You are right, this mapping is now wrong.
The reason I didn't keep the mapping as is, is because then the
physical pages from MX21_CS1_BASE_ADDR up to MX21_CS1_BASE_ADDR +
MX21ADS_CS8900A_MMIO_SIZE would be mapped twice to different virtual
addresses (once by this static mapping and once by the ioremap in the
cs89x0 driver).
Another approach could be to subtract 0x200000 from the offsets in the
definitions of MX21ADS_ST16C255_IOBASE_REG, MX21ADS_VERSION_REG and
MX21ADS_IO_REG. So the definition of MX21ADS_IO_REG would become
MX21ADS_REG_ADDR(0x600000). What do you think of this?
Regards,
Jaccon
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