283 lines
6.7 KiB
C
283 lines
6.7 KiB
C
/*
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* linux/drivers/video/savage/savagefb-i2c.c - S3 Savage DDC2
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*
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* Copyright 2004 Antonino A. Daplas <adaplas @pol.net>
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*
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* Based partly on rivafb-i2c.c
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file COPYING in the main directory of this archive
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* for more details.
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*/
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#include <linux/config.h>
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/delay.h>
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#include <linux/pci.h>
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#include <linux/fb.h>
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#include <asm/io.h>
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#include "savagefb.h"
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#define SAVAGE_DDC 0x50
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#define VGA_CR_IX 0x3d4
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#define VGA_CR_DATA 0x3d5
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#define CR_SERIAL1 0xa0 /* I2C serial communications interface */
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#define MM_SERIAL1 0xff20
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#define CR_SERIAL2 0xb1 /* DDC2 monitor communications interface */
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/* based on vt8365 documentation */
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#define PROSAVAGE_I2C_ENAB 0x10
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#define PROSAVAGE_I2C_SCL_OUT 0x01
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#define PROSAVAGE_I2C_SDA_OUT 0x02
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#define PROSAVAGE_I2C_SCL_IN 0x04
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#define PROSAVAGE_I2C_SDA_IN 0x08
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#define SAVAGE4_I2C_ENAB 0x00000020
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#define SAVAGE4_I2C_SCL_OUT 0x00000001
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#define SAVAGE4_I2C_SDA_OUT 0x00000002
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#define SAVAGE4_I2C_SCL_IN 0x00000008
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#define SAVAGE4_I2C_SDA_IN 0x00000010
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#define SET_CR_IX(base, val) writeb((val), base + 0x8000 + VGA_CR_IX)
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#define SET_CR_DATA(base, val) writeb((val), base + 0x8000 + VGA_CR_DATA)
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#define GET_CR_DATA(base) readb(base + 0x8000 + VGA_CR_DATA)
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static void savage4_gpio_setscl(void *data, int val)
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{
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struct savagefb_i2c_chan *chan = (struct savagefb_i2c_chan *)data;
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unsigned int r;
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r = readl(chan->ioaddr + chan->reg);
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if(val)
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r |= SAVAGE4_I2C_SCL_OUT;
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else
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r &= ~SAVAGE4_I2C_SCL_OUT;
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writel(r, chan->ioaddr + chan->reg);
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readl(chan->ioaddr + chan->reg); /* flush posted write */
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}
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static void savage4_gpio_setsda(void *data, int val)
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{
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struct savagefb_i2c_chan *chan = (struct savagefb_i2c_chan *)data;
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unsigned int r;
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r = readl(chan->ioaddr + chan->reg);
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if(val)
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r |= SAVAGE4_I2C_SDA_OUT;
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else
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r &= ~SAVAGE4_I2C_SDA_OUT;
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writel(r, chan->ioaddr + chan->reg);
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readl(chan->ioaddr + chan->reg); /* flush posted write */
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}
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static int savage4_gpio_getscl(void *data)
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{
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struct savagefb_i2c_chan *chan = (struct savagefb_i2c_chan *)data;
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return (0 != (readl(chan->ioaddr + chan->reg) & SAVAGE4_I2C_SCL_IN));
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}
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static int savage4_gpio_getsda(void *data)
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{
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struct savagefb_i2c_chan *chan = (struct savagefb_i2c_chan *)data;
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return (0 != (readl(chan->ioaddr + chan->reg) & SAVAGE4_I2C_SDA_IN));
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}
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static void prosavage_gpio_setscl(void* data, int val)
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{
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struct savagefb_i2c_chan *chan = (struct savagefb_i2c_chan *)data;
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u32 r;
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SET_CR_IX(chan->ioaddr, chan->reg);
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r = GET_CR_DATA(chan->ioaddr);
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r |= PROSAVAGE_I2C_ENAB;
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if (val) {
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r |= PROSAVAGE_I2C_SCL_OUT;
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} else {
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r &= ~PROSAVAGE_I2C_SCL_OUT;
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}
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SET_CR_DATA(chan->ioaddr, r);
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}
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static void prosavage_gpio_setsda(void* data, int val)
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{
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struct savagefb_i2c_chan *chan = (struct savagefb_i2c_chan *)data;
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unsigned int r;
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SET_CR_IX(chan->ioaddr, chan->reg);
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r = GET_CR_DATA(chan->ioaddr);
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r |= PROSAVAGE_I2C_ENAB;
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if (val) {
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r |= PROSAVAGE_I2C_SDA_OUT;
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} else {
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r &= ~PROSAVAGE_I2C_SDA_OUT;
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}
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SET_CR_DATA(chan->ioaddr, r);
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}
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static int prosavage_gpio_getscl(void* data)
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{
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struct savagefb_i2c_chan *chan = (struct savagefb_i2c_chan *)data;
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SET_CR_IX(chan->ioaddr, chan->reg);
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return (0 != (GET_CR_DATA(chan->ioaddr) & PROSAVAGE_I2C_SCL_IN));
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}
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static int prosavage_gpio_getsda(void* data)
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{
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struct savagefb_i2c_chan *chan = (struct savagefb_i2c_chan *)data;
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SET_CR_IX(chan->ioaddr, chan->reg);
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return (0 != (GET_CR_DATA(chan->ioaddr) & PROSAVAGE_I2C_SDA_IN));
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}
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#define I2C_ALGO_SAVAGE 0x0f0000
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static int savage_setup_i2c_bus(struct savagefb_i2c_chan *chan,
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const char *name)
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{
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int (*add_bus)(struct i2c_adapter *) = symbol_get(i2c_bit_add_bus);
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int rc = 0;
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if (add_bus && chan->par) {
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strcpy(chan->adapter.name, name);
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chan->adapter.owner = THIS_MODULE;
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chan->adapter.id = I2C_ALGO_SAVAGE;
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chan->adapter.algo_data = &chan->algo;
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chan->adapter.dev.parent = &chan->par->pcidev->dev;
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chan->algo.udelay = 40;
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chan->algo.mdelay = 5;
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chan->algo.timeout = 20;
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chan->algo.data = chan;
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i2c_set_adapdata(&chan->adapter, chan);
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/* Raise SCL and SDA */
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chan->algo.setsda(chan, 1);
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chan->algo.setscl(chan, 1);
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udelay(20);
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rc = add_bus(&chan->adapter);
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if (rc == 0)
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dev_dbg(&chan->par->pcidev->dev,
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"I2C bus %s registered.\n", name);
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else
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dev_warn(&chan->par->pcidev->dev,
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"Failed to register I2C bus %s.\n", name);
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symbol_put(i2c_bit_add_bus);
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} else
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chan->par = NULL;
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return rc;
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}
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void savagefb_create_i2c_busses(struct fb_info *info)
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{
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struct savagefb_par *par = (struct savagefb_par *)info->par;
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par->chan.par = par;
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switch(info->fix.accel) {
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case FB_ACCEL_PROSAVAGE_DDRK:
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case FB_ACCEL_PROSAVAGE_PM:
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par->chan.reg = CR_SERIAL2;
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par->chan.ioaddr = par->mmio.vbase;
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par->chan.algo.setsda = prosavage_gpio_setsda;
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par->chan.algo.setscl = prosavage_gpio_setscl;
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par->chan.algo.getsda = prosavage_gpio_getsda;
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par->chan.algo.getscl = prosavage_gpio_getscl;
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break;
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case FB_ACCEL_SAVAGE4:
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par->chan.reg = 0xff20;
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par->chan.ioaddr = par->mmio.vbase;
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par->chan.algo.setsda = savage4_gpio_setsda;
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par->chan.algo.setscl = savage4_gpio_setscl;
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par->chan.algo.getsda = savage4_gpio_getsda;
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par->chan.algo.getscl = savage4_gpio_getscl;
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break;
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default:
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par->chan.par = NULL;
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}
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savage_setup_i2c_bus(&par->chan, "SAVAGE DDC2");
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}
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void savagefb_delete_i2c_busses(struct fb_info *info)
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{
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struct savagefb_par *par = (struct savagefb_par *)info->par;
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int (*del_bus)(struct i2c_adapter *) =
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symbol_get(i2c_bit_del_bus);
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if (del_bus && par->chan.par) {
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del_bus(&par->chan.adapter);
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symbol_put(i2c_bit_del_bus);
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}
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par->chan.par = NULL;
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}
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static u8 *savage_do_probe_i2c_edid(struct savagefb_i2c_chan *chan)
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{
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u8 start = 0x0;
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int (*transfer)(struct i2c_adapter *, struct i2c_msg *, int) =
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symbol_get(i2c_transfer);
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struct i2c_msg msgs[] = {
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{
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.addr = SAVAGE_DDC,
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.len = 1,
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.buf = &start,
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}, {
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.addr = SAVAGE_DDC,
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.flags = I2C_M_RD,
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.len = EDID_LENGTH,
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},
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};
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u8 *buf = NULL;
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if (transfer && chan->par) {
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buf = kmalloc(EDID_LENGTH, GFP_KERNEL);
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if (buf) {
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msgs[1].buf = buf;
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if (transfer(&chan->adapter, msgs, 2) != 2) {
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dev_dbg(&chan->par->pcidev->dev,
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"Unable to read EDID block.\n");
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kfree(buf);
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buf = NULL;
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}
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}
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symbol_put(i2c_transfer);
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}
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return buf;
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}
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int savagefb_probe_i2c_connector(struct savagefb_par *par, u8 **out_edid)
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{
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u8 *edid = NULL;
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int i;
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for (i = 0; i < 3; i++) {
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/* Do the real work */
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edid = savage_do_probe_i2c_edid(&par->chan);
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if (edid)
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break;
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}
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if (out_edid)
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*out_edid = edid;
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if (!edid)
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return 1;
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return 0;
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}
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MODULE_LICENSE("GPL");
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