linux-kernel - Re: [PATCH V2] tty/serial: add support for Xilinx PS UART

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Message-ID: <BANLkTim2TyamL4Q+=b-So6phTF+Ng-cBUA@mail.gmail.com>
Date:	Fri, 22 Apr 2011 09:46:09 -0600
From:	Grant Likely <grant.likely@...retlab.ca>
To:	John Linn <john.linn@...inx.com>
Cc:	linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org,
	alan@...rguk.ukuu.org.uk, greg@...ah.com
Subject: Re: [PATCH V2] tty/serial: add support for Xilinx PS UART

On Fri, Apr 22, 2011 at 9:40 AM, Grant Likely <grant.likely@...retlab.ca> wrote:
> On Wed, Apr 20, 2011 at 1:03 PM, John Linn <john.linn@...inx.com> wrote:
>> The Xilinx PS Uart is used on the new ARM based SoC. This
>> UART is not compatible with others such that a seperate
>> driver is required.
>>
>> Signed-off-by: John Linn <john.linn@...inx.com>
>
> Out of curiosity, who is the vendor of this uart IP block?  Is it new
> hardware created by xilinx for zinq, or is it provided by a third
> party.  If its from a third party it is within the realm of
> possibility that a driver already exists for it.
>
> g.
>> +/********************************Register Map********************************/
>> +/** UART
>> + *
>> + * Register offsets for the UART.
>> + *
>> + */
>> +#define XUARTPS_CR_OFFSET      0x00  /* Control Register [8:0] */
>> +#define XUARTPS_MR_OFFSET      0x04  /* Mode Register [10:0] */
>> +#define XUARTPS_IER_OFFSET     0x08  /* Interrupt Enable [10:0] */
>> +#define XUARTPS_IDR_OFFSET     0x0C  /* Interrupt Disable [10:0] */
>> +#define XUARTPS_IMR_OFFSET     0x10  /* Interrupt Mask [10:0] */
>> +#define XUARTPS_ISR_OFFSET     0x14  /* Interrupt Status [10:0]*/
>> +#define XUARTPS_BAUDGEN_OFFSET 0x18  /* Baud Rate Generator [15:0] */
>> +#define XUARTPS_RXTOUT_OFFSET  0x1C  /* RX Timeout [7:0] */
>> +#define XUARTPS_RXWM_OFFSET    0x20  /* RX FIFO Trigger Level [5:0] */
>> +#define XUARTPS_MODEMCR_OFFSET 0x24  /* Modem Control [5:0] */
>> +#define XUARTPS_MODEMSR_OFFSET 0x28  /* Modem Status [8:0] */
>> +#define XUARTPS_SR_OFFSET      0x2C  /* Channel Status [11:0] */
>> +#define XUARTPS_FIFO_OFFSET    0x30  /* FIFO [15:0] or [7:0] */
>> +#define XUARTPS_BAUDDIV_OFFSET 0x34  /* Baud Rate Divider [7:0] */
>> +#define XUARTPS_FLOWDEL_OFFSET 0x38  /* Flow Delay [15:0] */
>> +#define XUARTPS_IRRX_PWIDTH_OFFSET 0x3C /* IR Minimum Received Pulse
>> +                                               Width [15:0] */
>> +#define XUARTPS_IRTX_PWIDTH_OFFSET 0x40 /* IR Transmitted pulse
>> +                                               Width [7:0] */
>> +#define XUARTPS_TXWM_OFFSET    0x44  /* TX FIFO Trigger Level [5:0] */

After a quick search:

from include/linux/atmel_serial.h
#define ATMEL_US_CR             0x00                    /* Control Register */
#define ATMEL_US_MR             0x04                    /* Mode Register */
#define ATMEL_US_IER            0x08                    /* Interrupt
Enable Register */
#define ATMEL_US_IDR            0x0c                    /* Interrupt
Disable Register */
#define ATMEL_US_IMR            0x10                    /* Interrupt
Mask Register */
#define ATMEL_US_CSR            0x14                    /* Channel
Status Register */
#define ATMEL_US_RHR            0x18                    /* Receiver
Holding Register */
#define ATMEL_US_THR            0x1c                    /* Transmitter
Holding Register */
#define ATMEL_US_BRGR           0x20                    /* Baud Rate
Generator Register */
#define ATMEL_US_RTOR           0x24                    /* Receiver
Time-out Register */
#define ATMEL_US_TTGR           0x28                    /* Transmitter
Timeguard Register */
#define ATMEL_US_FIDI           0x40                    /* FI DI Ratio
Register */
#define ATMEL_US_NER            0x44                    /* Number of
Errors Register */
#define ATMEL_US_IF             0x4c                    /* IrDA Filter
Register */


Not exactly the same, but worth exploring
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