Re: [PATCH intel-gpu-tools] tools: Added intel_dpio_read and intel_dpio_write

[Jani Nikula <jani.nikula@linux.intel.com>]

On Thu, 02 Aug 2012, Ben Widawsky <ben@bwidawsk.net> wrote:
> On 2012-08-02 05:07, Vijay Purushothaman wrote:
>> In Valleyview the DPLL and lane control registers are accessible only
>> through side band fabric called DPIO. Added two tools to read and 
>> write
>> registers residing in this space.
>
> Could I convince you to use the centralized read/write mmio functions?
> Otherwise, everything seems fine to me here.

The introduced intel_dpio_read.c and intel_dpio_write.c files are almost
the same. They could share most of the code instead of duplication, IMO.

BR,
Jani.


>
>>
>> Signed-off-by: Vijay Purushothaman <vijay.a.purushothaman@intel.com>
>> ---
>>  tools/Makefile.am        |    2 +
>>  tools/intel_dpio_read.c  |  105
>> ++++++++++++++++++++++++++++++++++++++++++++++
>>  tools/intel_dpio_write.c |  103
>> +++++++++++++++++++++++++++++++++++++++++++++
>>  3 files changed, 210 insertions(+)
>>  create mode 100644 tools/intel_dpio_read.c
>>  create mode 100644 tools/intel_dpio_write.c
>>
>> diff --git a/tools/Makefile.am b/tools/Makefile.am
>> index d461f38..71fb087 100644
>> --- a/tools/Makefile.am
>> +++ b/tools/Makefile.am
>> @@ -15,6 +15,8 @@ bin_PROGRAMS = 				\
>>  	intel_reg_write 		\
>>  	intel_reg_read 			\
>>  	intel_forcewaked		\
>> +	intel_dpio_read			\
>> +	intel_dpio_write		\
>>  	intel_l3_parity
>>
>>  noinst_PROGRAMS = 			\
>> diff --git a/tools/intel_dpio_read.c b/tools/intel_dpio_read.c
>> new file mode 100644
>> index 0000000..8b924fd
>> --- /dev/null
>> +++ b/tools/intel_dpio_read.c
>> @@ -0,0 +1,105 @@
>> +/*
>> + * Copyright © 2012 Intel Corporation
>> + *
>> + * Permission is hereby granted, free of charge, to any person 
>> obtaining a
>> + * copy of this software and associated documentation files (the
>> "Software"),
>> + * to deal in the Software without restriction, including without 
>> limitation
>> + * the rights to use, copy, modify, merge, publish, distribute, 
>> sublicense,
>> + * and/or sell copies of the Software, and to permit persons to whom 
>> the
>> + * Software is furnished to do so, subject to the following 
>> conditions:
>> + *
>> + * The above copyright notice and this permission notice (including 
>> the next
>> + * paragraph) shall be included in all copies or substantial 
>> portions of the
>> + * Software.
>> + *
>> + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
>> EXPRESS OR
>> + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 
>> MERCHANTABILITY,
>> + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO 
>> EVENT SHALL
>> + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES
>> OR OTHER
>> + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 
>> ARISING
>> + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 
>> OTHER
>> + * DEALINGS IN THE SOFTWARE.
>> + *
>> + * Authors:
>> + *		Vijay Purushothaman <vijay.a.purushothaman@intel.com>
>> + *
>> + */
>> +
>> +#include <unistd.h>
>> +#include <stdlib.h>
>> +#include <stdio.h>
>> +#include <err.h>
>> +#include <string.h>
>> +#include "intel_gpu_tools.h"
>> +
>> +#define VLV_DISPLAY_BASE		0x180000
>> +#define DPIO_PKT				0x2100
>> +#define  DPIO_RID				(0 << 24)
>> +#define  DPIO_OP_WRITE			(1 << 16)
>> +#define  DPIO_OP_READ			(0 << 16)
>> +#define  DPIO_PORTID			(0x12 << 8)
>> +#define  DPIO_BYTE				(0xf << 4)
>> +#define  DPIO_BUSY				(1 << 0)
>> +#define DPIO_DATA				0x2104
>> +#define DPIO_REG				0x2108
>> +
>> +static uint32_t vlv_display_reg_read(uint32_t reg)
>> +{
>> +	reg += VLV_DISPLAY_BASE;
>> +	return (*(volatile uint32_t *)((volatile char*)mmio + reg));
>> +}
>> +
>> +static void vlv_display_reg_write(uint32_t reg, uint32_t val)
>> +{
>> +	volatile uint32_t *ptr;
>> +
>> +	reg += VLV_DISPLAY_BASE;
>> +	ptr = (volatile uint32_t *)((volatile char *) mmio + reg);
>> +	*ptr = val;
>> +}
>> +
>> +static void usage(char *cmdname)
>> +{
>> +	printf("Warning : This program will work only on Valleyview\n");
>> +	printf("Usage: %s [addr]\n", cmdname);
>> +	printf("\t addr : in 0xXXXX format\n");
>> +}
>> +
>> +int main(int argc, char** argv)
>> +{
>> +	int ret = 0;
>> +	uint32_t reg, val;
>> +	char *cmdname = strdup(argv[0]);
>> +
>> +	if (argc != 2) {
>> +		usage(cmdname);
>> +		ret = 1;
>> +		goto out;
>> +	}
>> +
>> +	sscanf(argv[1], "0x%x", &reg);
>> +
>> +	intel_register_access_init(intel_get_pci_device(), 0);
>> +
>> +	/* Check whether the side band fabric is ready to accept commands 
>> */
>> +	do {
>> +		usleep(1);
>> +	} while (vlv_display_reg_read(DPIO_PKT) & DPIO_BUSY);
>> +
>> +	vlv_display_reg_write(DPIO_REG, reg);
>> +	vlv_display_reg_write(DPIO_PKT, DPIO_RID | DPIO_OP_READ | 
>> DPIO_PORTID |
>> +							DPIO_BYTE);
>> +	do {
>> +		usleep(1);
>> +	} while (vlv_display_reg_read(DPIO_PKT) & DPIO_BUSY);
>> +
>> +	val = vlv_display_reg_read(DPIO_DATA);
>> +
>> +	printf("Read DPIO register: 0x%x - Value : 0x%x\n", reg, val);
>> +
>> +	intel_register_access_fini();
>> +
>> +out:
>> +	free(cmdname);
>> +	return ret;
>> +}
>> diff --git a/tools/intel_dpio_write.c b/tools/intel_dpio_write.c
>> new file mode 100644
>> index 0000000..96b72dd
>> --- /dev/null
>> +++ b/tools/intel_dpio_write.c
>> @@ -0,0 +1,103 @@
>> +/*
>> + * Copyright © 2012 Intel Corporation
>> + *
>> + * Permission is hereby granted, free of charge, to any person 
>> obtaining a
>> + * copy of this software and associated documentation files (the
>> "Software"),
>> + * to deal in the Software without restriction, including without 
>> limitation
>> + * the rights to use, copy, modify, merge, publish, distribute, 
>> sublicense,
>> + * and/or sell copies of the Software, and to permit persons to whom 
>> the
>> + * Software is furnished to do so, subject to the following 
>> conditions:
>> + *
>> + * The above copyright notice and this permission notice (including 
>> the next
>> + * paragraph) shall be included in all copies or substantial 
>> portions of the
>> + * Software.
>> + *
>> + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
>> EXPRESS OR
>> + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 
>> MERCHANTABILITY,
>> + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO 
>> EVENT SHALL
>> + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES
>> OR OTHER
>> + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 
>> ARISING
>> + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 
>> OTHER
>> + * DEALINGS IN THE SOFTWARE.
>> + *
>> + * Authors:
>> + *		Vijay Purushothaman <vijay.a.purushothaman@intel.com>
>> + *
>> + */
>> +
>> +#include <unistd.h>
>> +#include <stdlib.h>
>> +#include <stdio.h>
>> +#include <err.h>
>> +#include <string.h>
>> +#include "intel_gpu_tools.h"
>> +
>> +#define VLV_DISPLAY_BASE		0x180000
>> +#define DPIO_PKT				0x2100
>> +#define  DPIO_RID				(0 << 24)
>> +#define  DPIO_OP_WRITE			(1 << 16)
>> +#define  DPIO_OP_READ			(0 << 16)
>> +#define  DPIO_PORTID			(0x12 << 8)
>> +#define  DPIO_BYTE				(0xf << 4)
>> +#define  DPIO_BUSY				(1 << 0)
>> +#define DPIO_DATA				0x2104
>> +#define DPIO_REG				0x2108
>> +
>> +static uint32_t vlv_display_reg_read(uint32_t reg)
>> +{
>> +	reg += VLV_DISPLAY_BASE;
>> +	return (*(volatile uint32_t *)((volatile char*)mmio + reg));
>> +}
>> +
>> +static void vlv_display_reg_write(uint32_t reg, uint32_t val)
>> +{
>> +	volatile uint32_t *ptr;
>> +
>> +	reg += VLV_DISPLAY_BASE;
>> +	ptr = (volatile uint32_t *)((volatile char *) mmio + reg);
>> +	*ptr = val;
>> +}
>> +
>> +static void usage(char *cmdname)
>> +{
>> +	printf("Warning : This program will work only on Valleyview\n");
>> +	printf("Usage: %s [addr] [val]\n", cmdname);
>> +	printf("\t addr : in 0xXXXX format\n");
>> +}
>> +
>> +int main(int argc, char** argv)
>> +{
>> +	int ret = 0;
>> +	uint32_t reg, val;
>> +	char *cmdname = strdup(argv[0]);
>> +
>> +	if (argc != 3) {
>> +		usage(cmdname);
>> +		ret = 1;
>> +		goto out;
>> +	}
>> +
>> +	sscanf(argv[1], "0x%x", &reg);
>> +	sscanf(argv[2], "0x%x", &val);
>> +
>> +	intel_register_access_init(intel_get_pci_device(), 0);
>> +
>> +	/* Check whether the side band fabric is ready to accept commands 
>> */
>> +	do {
>> +		usleep(1);
>> +	} while (vlv_display_reg_read(DPIO_PKT) & DPIO_BUSY);
>> +
>> +	vlv_display_reg_write(DPIO_DATA, val);
>> +	vlv_display_reg_write(DPIO_REG, reg);
>> +	vlv_display_reg_write(DPIO_PKT, DPIO_RID | DPIO_OP_WRITE | 
>> DPIO_PORTID |
>> +							DPIO_BYTE);
>> +	do {
>> +		usleep(1);
>> +	} while (vlv_display_reg_read(DPIO_PKT) & DPIO_BUSY);
>> +
>> +	intel_register_access_fini();
>> +
>> +out:
>> +	free(cmdname);
>> +	return ret;
>> +}
>
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