266 lines
6.0 KiB
C
266 lines
6.0 KiB
C
#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 <linux/i2c.h>
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#include <linux/i2c-id.h>
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#include <linux/i2c-algo-bit.h>
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#include <asm/io.h>
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#include <video/radeon.h>
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#include "radeonfb.h"
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#include "../edid.h"
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#define RADEON_DDC 0x50
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static void radeon_gpio_setscl(void* data, int state)
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{
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struct radeon_i2c_chan *chan = data;
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struct radeonfb_info *rinfo = chan->rinfo;
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u32 val;
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val = INREG(chan->ddc_reg) & ~(VGA_DDC_CLK_OUT_EN);
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if (!state)
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val |= VGA_DDC_CLK_OUT_EN;
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OUTREG(chan->ddc_reg, val);
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(void)INREG(chan->ddc_reg);
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}
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static void radeon_gpio_setsda(void* data, int state)
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{
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struct radeon_i2c_chan *chan = data;
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struct radeonfb_info *rinfo = chan->rinfo;
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u32 val;
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val = INREG(chan->ddc_reg) & ~(VGA_DDC_DATA_OUT_EN);
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if (!state)
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val |= VGA_DDC_DATA_OUT_EN;
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OUTREG(chan->ddc_reg, val);
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(void)INREG(chan->ddc_reg);
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}
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static int radeon_gpio_getscl(void* data)
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{
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struct radeon_i2c_chan *chan = data;
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struct radeonfb_info *rinfo = chan->rinfo;
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u32 val;
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val = INREG(chan->ddc_reg);
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return (val & VGA_DDC_CLK_INPUT) ? 1 : 0;
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}
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static int radeon_gpio_getsda(void* data)
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{
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struct radeon_i2c_chan *chan = data;
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struct radeonfb_info *rinfo = chan->rinfo;
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u32 val;
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val = INREG(chan->ddc_reg);
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return (val & VGA_DDC_DATA_INPUT) ? 1 : 0;
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}
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static int radeon_setup_i2c_bus(struct radeon_i2c_chan *chan, const char *name)
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{
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int rc;
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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_HW_B_RADEON;
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chan->adapter.algo_data = &chan->algo;
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chan->adapter.dev.parent = &chan->rinfo->pdev->dev;
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chan->algo.setsda = radeon_gpio_setsda;
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chan->algo.setscl = radeon_gpio_setscl;
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chan->algo.getsda = radeon_gpio_getsda;
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chan->algo.getscl = radeon_gpio_getscl;
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chan->algo.udelay = 40;
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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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radeon_gpio_setsda(chan, 1);
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radeon_gpio_setscl(chan, 1);
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udelay(20);
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rc = i2c_bit_add_bus(&chan->adapter);
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if (rc == 0)
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dev_dbg(&chan->rinfo->pdev->dev, "I2C bus %s registered.\n", name);
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else
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dev_warn(&chan->rinfo->pdev->dev, "Failed to register I2C bus %s.\n", name);
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return rc;
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}
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void radeon_create_i2c_busses(struct radeonfb_info *rinfo)
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{
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rinfo->i2c[0].rinfo = rinfo;
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rinfo->i2c[0].ddc_reg = GPIO_MONID;
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radeon_setup_i2c_bus(&rinfo->i2c[0], "monid");
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rinfo->i2c[1].rinfo = rinfo;
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rinfo->i2c[1].ddc_reg = GPIO_DVI_DDC;
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radeon_setup_i2c_bus(&rinfo->i2c[1], "dvi");
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rinfo->i2c[2].rinfo = rinfo;
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rinfo->i2c[2].ddc_reg = GPIO_VGA_DDC;
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radeon_setup_i2c_bus(&rinfo->i2c[2], "vga");
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rinfo->i2c[3].rinfo = rinfo;
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rinfo->i2c[3].ddc_reg = GPIO_CRT2_DDC;
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radeon_setup_i2c_bus(&rinfo->i2c[3], "crt2");
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}
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void radeon_delete_i2c_busses(struct radeonfb_info *rinfo)
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{
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if (rinfo->i2c[0].rinfo)
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i2c_bit_del_bus(&rinfo->i2c[0].adapter);
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rinfo->i2c[0].rinfo = NULL;
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if (rinfo->i2c[1].rinfo)
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i2c_bit_del_bus(&rinfo->i2c[1].adapter);
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rinfo->i2c[1].rinfo = NULL;
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if (rinfo->i2c[2].rinfo)
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i2c_bit_del_bus(&rinfo->i2c[2].adapter);
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rinfo->i2c[2].rinfo = NULL;
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if (rinfo->i2c[3].rinfo)
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i2c_bit_del_bus(&rinfo->i2c[3].adapter);
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rinfo->i2c[3].rinfo = NULL;
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}
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static u8 *radeon_do_probe_i2c_edid(struct radeon_i2c_chan *chan)
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{
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u8 start = 0x0;
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struct i2c_msg msgs[] = {
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{
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.addr = RADEON_DDC,
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.len = 1,
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.buf = &start,
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}, {
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.addr = RADEON_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;
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buf = kmalloc(EDID_LENGTH, GFP_KERNEL);
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if (!buf) {
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dev_warn(&chan->rinfo->pdev->dev, "Out of memory!\n");
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return NULL;
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}
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msgs[1].buf = buf;
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if (i2c_transfer(&chan->adapter, msgs, 2) == 2)
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return buf;
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dev_dbg(&chan->rinfo->pdev->dev, "Unable to read EDID block.\n");
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kfree(buf);
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return NULL;
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}
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int radeon_probe_i2c_connector(struct radeonfb_info *rinfo, int conn, u8 **out_edid)
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{
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u32 reg = rinfo->i2c[conn-1].ddc_reg;
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u8 *edid = NULL;
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int i, j;
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OUTREG(reg, INREG(reg) &
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~(VGA_DDC_DATA_OUTPUT | VGA_DDC_CLK_OUTPUT));
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OUTREG(reg, INREG(reg) & ~(VGA_DDC_CLK_OUT_EN));
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(void)INREG(reg);
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for (i = 0; i < 3; i++) {
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/* For some old monitors we need the
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* following process to initialize/stop DDC
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*/
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OUTREG(reg, INREG(reg) & ~(VGA_DDC_DATA_OUT_EN));
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(void)INREG(reg);
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msleep(13);
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OUTREG(reg, INREG(reg) & ~(VGA_DDC_CLK_OUT_EN));
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(void)INREG(reg);
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for (j = 0; j < 5; j++) {
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msleep(10);
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if (INREG(reg) & VGA_DDC_CLK_INPUT)
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break;
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}
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if (j == 5)
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continue;
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OUTREG(reg, INREG(reg) | VGA_DDC_DATA_OUT_EN);
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(void)INREG(reg);
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msleep(15);
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OUTREG(reg, INREG(reg) | VGA_DDC_CLK_OUT_EN);
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(void)INREG(reg);
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msleep(15);
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OUTREG(reg, INREG(reg) & ~(VGA_DDC_DATA_OUT_EN));
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(void)INREG(reg);
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msleep(15);
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/* Do the real work */
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edid = radeon_do_probe_i2c_edid(&rinfo->i2c[conn-1]);
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OUTREG(reg, INREG(reg) |
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(VGA_DDC_DATA_OUT_EN | VGA_DDC_CLK_OUT_EN));
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(void)INREG(reg);
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msleep(15);
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OUTREG(reg, INREG(reg) & ~(VGA_DDC_CLK_OUT_EN));
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(void)INREG(reg);
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for (j = 0; j < 10; j++) {
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msleep(10);
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if (INREG(reg) & VGA_DDC_CLK_INPUT)
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break;
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}
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OUTREG(reg, INREG(reg) & ~(VGA_DDC_DATA_OUT_EN));
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(void)INREG(reg);
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msleep(15);
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OUTREG(reg, INREG(reg) |
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(VGA_DDC_DATA_OUT_EN | VGA_DDC_CLK_OUT_EN));
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(void)INREG(reg);
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if (edid)
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break;
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}
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/* Release the DDC lines when done or the Apple Cinema HD display
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* will switch off
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*/
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OUTREG(reg, INREG(reg) & ~(VGA_DDC_CLK_OUT_EN | VGA_DDC_DATA_OUT_EN));
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(void)INREG(reg);
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if (out_edid)
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*out_edid = edid;
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if (!edid) {
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RTRACE("radeonfb: I2C (port %d) ... not found\n", conn);
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return MT_NONE;
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}
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if (edid[0x14] & 0x80) {
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/* Fix detection using BIOS tables */
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if (rinfo->is_mobility /*&& conn == ddc_dvi*/ &&
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(INREG(LVDS_GEN_CNTL) & LVDS_ON)) {
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RTRACE("radeonfb: I2C (port %d) ... found LVDS panel\n", conn);
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return MT_LCD;
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} else {
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RTRACE("radeonfb: I2C (port %d) ... found TMDS panel\n", conn);
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return MT_DFP;
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}
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}
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RTRACE("radeonfb: I2C (port %d) ... found CRT display\n", conn);
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return MT_CRT;
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}
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