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radeon.c

/*
 *  ddc/ci direct PCI memory interface for ATI cards
 *  Copyright(c) 2005 Christian Schilling
 *
 *  Based on radeon_i2c.c from the kernel source.
 * 
 *  Original copyright:
 *
 *    framebuffer driver for ATI Radeon chipset video boards
 *
 *    Copyright 2003    Ben. Herrenschmidt <benh@kernel.crashing.org>
 *    Copyright 2000    Ani Joshi <ajoshi@kernel.crashing.org>
 *
 *    i2c bits from Luca Tettamanti <kronos@kronoz.cjb.net>
 *    
 *    Special thanks to ATI DevRel team for their hardware donations.
 *
 *    ...Insert GPL boilerplate here...
 *
 *    Significant portions of this driver apdated from XFree86 Radeon
 *    driver which has the following copyright notice:
 *
 *    Copyright 2000 ATI Technologies Inc., Markham, Ontario, and
 *                     VA Linux Systems Inc., Fremont, California.
 *
 *    All Rights Reserved.
 *
 *    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 on 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
 *    NON-INFRINGEMENT.  IN NO EVENT SHALL ATI, VA LINUX SYSTEMS AND/OR
 *    THEIR SUPPLIERS 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.
 *
 *    XFree86 driver authors:
 *
 *       Kevin E. Martin <martin@xfree86.org>
 *       Rickard E. Faith <faith@valinux.com>
 *       Alan Hourihane <alanh@fairlite.demon.co.uk>
 *
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/mman.h>
#include <unistd.h>


#include "ddcpci.h"



#define RADEON_REGSIZE              0x4000

/* GPIO bit constants */
#define GPIO_A_0                (1 <<  0)
#define GPIO_A_1                (1 <<  1)
#define GPIO_Y_0                (1 <<  8)
#define GPIO_Y_1                (1 <<  9)
#define GPIO_EN_0               (1 << 16)
#define GPIO_EN_1               (1 << 17)
#define GPIO_MASK_0             (1 << 24)
#define GPIO_MASK_1             (1 << 25)
#define VGA_DDC_DATA_OUTPUT     GPIO_A_0
#define VGA_DDC_CLK_OUTPUT      GPIO_A_1
#define VGA_DDC_DATA_INPUT      GPIO_Y_0
#define VGA_DDC_CLK_INPUT       GPIO_Y_1
#define VGA_DDC_DATA_OUT_EN     GPIO_EN_0
#define VGA_DDC_CLK_OUT_EN      GPIO_EN_1


/* Radeons i2c busses */
#define GPIO_VGA_DDC                           0x0060  
#define GPIO_DVI_DDC                           0x0064  
#define GPIO_MONID                             0x0068  
#define GPIO_CRT2_DDC                          0x006c


static inline unsigned int readl(const volatile void *addr)
{
      return *(volatile unsigned int*) addr;
}

static inline void writel(unsigned int b, volatile void *addr)
{
      *(volatile unsigned int*) addr = b;
}

#define INREG(addr)           readl((ldata->PCIO)+addr)
#define OUTREG(addr,val)      writel(val, (ldata->PCIO)+addr)

struct mem_data {
      int fd; // /dev/mem fd
      char* memory; // mmaped memory
      size_t length; // mmaped memory length
};

struct i2c_data {
      char* PCIO;
      int ddc_base;
};


static void radeon_gpio_setscl(void* data, int state)
{
      struct i2c_data *ldata = data;
      u32               val;
      
      val = INREG(ldata->ddc_base) & ~(VGA_DDC_CLK_OUT_EN);
      if (!state)
            val |= VGA_DDC_CLK_OUT_EN;

      OUTREG(ldata->ddc_base, val);
      (void)INREG(ldata->ddc_base);
}

static void radeon_gpio_setsda(void* data, int state)
{
      struct i2c_data   *ldata = data;
      u32               val;
      
      val = INREG(ldata->ddc_base) & ~(VGA_DDC_DATA_OUT_EN);
      if (!state)
            val |= VGA_DDC_DATA_OUT_EN;

      OUTREG(ldata->ddc_base, val);
      (void)INREG(ldata->ddc_base);
}

static int radeon_gpio_getscl(void* data)
{
      struct i2c_data   *ldata = data;
      u32               val;
      
      val = INREG(ldata->ddc_base);

      return (val & VGA_DDC_CLK_INPUT) ? 1 : 0;
}

static int radeon_gpio_getsda(void* data)
{
      struct i2c_data   *ldata = data;
      u32               val;
      
      val = INREG(ldata->ddc_base);

      return (val & VGA_DDC_DATA_INPUT) ? 1 : 0;
}

static int radeon_setup_i2c_bus(struct i2c_algo_bit_data* algo, char* PCIO, int ddc_base)
{
//fprintf(stderr, "init_i2c_bus: (ddc_base: %#x)\n", ddc_base);
      struct i2c_data* data = malloc(sizeof(struct i2c_data));
      if (!data) {
            fprintf(stderr, _("radeon.c:init_i2c_bus: Malloc error."));
            exit(-1);
      }
      data->PCIO = PCIO;
      data->ddc_base = ddc_base;
      
      algo->setsda            = radeon_gpio_setsda;
      algo->setscl            = radeon_gpio_setscl;
      algo->getsda            = radeon_gpio_getsda;
      algo->getscl            = radeon_gpio_getscl;
      algo->udelay            = 40;
      algo->timeout           = 100;
      algo->data        = data;     
      
      
      /* Raise SCL and SDA */
      radeon_gpio_setsda(data, 1);
      radeon_gpio_setscl(data, 1);
      usleep(200000);


//    test_bus(algo, "Radeon");
      return 1;
}


struct card* radeon_open(struct pci_dev *dev)
{
      if (dev->vendor_id != 0x1002) {
            return 0;
      }

      
      struct card* radeon_card = malloc(sizeof(struct card));
      struct mem_data* data = malloc(sizeof(struct mem_data));
      if ((!radeon_card) || (!data)) {
            fprintf(stderr, _("%s: Malloc error.\n"), "radeon_open");
            exit(-1);
      }
      memset(radeon_card, 0, sizeof(struct card));


      
      radeon_card->data = data;
      
      data->fd = open("/dev/mem", O_RDWR);
      
      if (data->fd < 0) {
            perror(_("radeon_open: cannot open /dev/mem"));
            radeon_close(radeon_card);
            return 0;
      }
      
      data->length = RADEON_REGSIZE;
      data->memory = mmap(data->memory, data->length, PROT_READ|PROT_WRITE, MAP_SHARED, data->fd, dev->base_addr[2]);

      if (data->memory == MAP_FAILED) {
            perror(_("radeon_open: mmap failed"));
            radeon_close(radeon_card);
            return 0;
      }
      
      
      char* PCIO = data->memory;
      
      radeon_card->nbusses = 4;
      radeon_card->i2c_busses = malloc(4*sizeof(struct i2c_algo_bit_data));
      radeon_setup_i2c_bus(&radeon_card->i2c_busses[0], PCIO, GPIO_VGA_DDC);
      radeon_setup_i2c_bus(&radeon_card->i2c_busses[1], PCIO, GPIO_DVI_DDC);
      radeon_setup_i2c_bus(&radeon_card->i2c_busses[2], PCIO, GPIO_MONID);
      radeon_setup_i2c_bus(&radeon_card->i2c_busses[3], PCIO, GPIO_CRT2_DDC);
      
      return radeon_card;
}


void radeon_close(struct card* radeon_card)
{
      int i;
      
      if (radeon_card) {
            struct mem_data* data = radeon_card->data;
            if ((data->memory) && (data->memory == MAP_FAILED) && (data->length)) {
                  munmap(data->memory, data->length);
            }
            free(radeon_card->data);
      }
      
      for (i = 0; i < radeon_card->nbusses; i++) {
            free((&radeon_card->i2c_busses[i])->data);
      }
      
      free(radeon_card->i2c_busses);
      
      free(radeon_card);

}

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