static void i2c_au1550_setup(struct i2c_au1550_data *priv)
{
volatile psc_smb_t *sp = (volatile psc_smb_t *)priv->psc_base;
u32 stat;
sp->psc_ctrl = PSC_CTRL_DISABLE;
au_sync();
sp->psc_sel = PSC_SEL_PS_SMBUSMODE;
sp->psc_smbcfg = 0;
au_sync();
sp->psc_ctrl = PSC_CTRL_ENABLE;
au_sync();
do {
stat = sp->psc_smbstat;
au_sync();
} while ((stat & PSC_SMBSTAT_SR) == 0);
sp->psc_smbcfg = (PSC_SMBCFG_RT_FIFO8 | PSC_SMBCFG_TT_FIFO8 |
PSC_SMBCFG_DD_DISABLE);
sp->psc_smbcfg |= PSC_SMBCFG_SET_DIV(PSC_SMBCFG_DIV8);
sp->psc_smbmsk = PSC_SMBMSK_ALLMASK;
au_sync();
sp->psc_smbtmr = PSC_SMBTMR_SET_TH(0) | PSC_SMBTMR_SET_PS(15) | \
PSC_SMBTMR_SET_PU(15) | PSC_SMBTMR_SET_SH(15) | \
PSC_SMBTMR_SET_SU(15) | PSC_SMBTMR_SET_CL(15) | \
PSC_SMBTMR_SET_CH(15);
au_sync();
sp->psc_smbcfg |= PSC_SMBCFG_DE_ENABLE;
do {
stat = sp->psc_smbstat;
au_sync();
} while ((stat & PSC_SMBSTAT_SR) == 0);
sp->psc_ctrl = PSC_CTRL_SUSPEND;
au_sync();
}
static void i2c_au1550_setup(struct i2c_au1550_data *priv)
{
unsigned long cfg;
WR(priv, PSC_CTRL, PSC_CTRL_DISABLE);
WR(priv, PSC_SEL, PSC_SEL_PS_SMBUSMODE);
WR(priv, PSC_SMBCFG, 0);
WR(priv, PSC_CTRL, PSC_CTRL_ENABLE);
while ((RD(priv, PSC_SMBSTAT) & PSC_SMBSTAT_SR) == 0)
cpu_relax();
cfg = PSC_SMBCFG_RT_FIFO8 | PSC_SMBCFG_TT_FIFO8 | PSC_SMBCFG_DD_DISABLE;
WR(priv, PSC_SMBCFG, cfg);
/* Divide by 8 to get a 6.25 MHz clock. The later protocol
* timings are based on this clock.
*/
cfg |= PSC_SMBCFG_SET_DIV(PSC_SMBCFG_DIV8);
WR(priv, PSC_SMBCFG, cfg);
WR(priv, PSC_SMBMSK, PSC_SMBMSK_ALLMASK);
/* Set the protocol timer values. See Table 71 in the
* Au1550 Data Book for standard timing values.
*/
WR(priv, PSC_SMBTMR, PSC_SMBTMR_SET_TH(0) | PSC_SMBTMR_SET_PS(15) | \
PSC_SMBTMR_SET_PU(15) | PSC_SMBTMR_SET_SH(15) | \
PSC_SMBTMR_SET_SU(15) | PSC_SMBTMR_SET_CL(15) | \
PSC_SMBTMR_SET_CH(15));
cfg |= PSC_SMBCFG_DE_ENABLE;
WR(priv, PSC_SMBCFG, cfg);
while ((RD(priv, PSC_SMBSTAT) & PSC_SMBSTAT_SR) == 0)
cpu_relax();
WR(priv, PSC_CTRL, PSC_CTRL_SUSPEND);
}
/*
* registering functions to load algorithms at runtime
* Prior to calling us, the 50MHz clock frequency and routing
* must have been set up for the PSC indicated by the adapter.
*/
static int __devinit
i2c_au1550_probe(struct platform_device *pdev)
{
struct i2c_au1550_data *priv;
volatile psc_smb_t *sp;
struct resource *r;
u32 stat;
int ret;
r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!r) {
ret = -ENODEV;
goto out;
}
priv = kzalloc(sizeof(struct i2c_au1550_data), GFP_KERNEL);
if (!priv) {
ret = -ENOMEM;
goto out;
}
priv->ioarea = request_mem_region(r->start, r->end - r->start + 1,
pdev->name);
if (!priv->ioarea) {
ret = -EBUSY;
goto out_mem;
}
priv->psc_base = r->start;
priv->xfer_timeout = 200;
priv->ack_timeout = 200;
priv->adap.id = I2C_HW_AU1550_PSC;
priv->adap.nr = pdev->id;
priv->adap.algo = &au1550_algo;
priv->adap.algo_data = priv;
priv->adap.dev.parent = &pdev->dev;
strlcpy(priv->adap.name, "Au1xxx PSC I2C", sizeof(priv->adap.name));
/* Now, set up the PSC for SMBus PIO mode.
*/
sp = (volatile psc_smb_t *)priv->psc_base;
sp->psc_ctrl = PSC_CTRL_DISABLE;
au_sync();
sp->psc_sel = PSC_SEL_PS_SMBUSMODE;
sp->psc_smbcfg = 0;
au_sync();
sp->psc_ctrl = PSC_CTRL_ENABLE;
au_sync();
do {
stat = sp->psc_smbstat;
au_sync();
} while ((stat & PSC_SMBSTAT_SR) == 0);
sp->psc_smbcfg = (PSC_SMBCFG_RT_FIFO8 | PSC_SMBCFG_TT_FIFO8 |
PSC_SMBCFG_DD_DISABLE);
/* Divide by 8 to get a 6.25 MHz clock. The later protocol
* timings are based on this clock.
*/
sp->psc_smbcfg |= PSC_SMBCFG_SET_DIV(PSC_SMBCFG_DIV8);
sp->psc_smbmsk = PSC_SMBMSK_ALLMASK;
au_sync();
/* Set the protocol timer values. See Table 71 in the
* Au1550 Data Book for standard timing values.
*/
sp->psc_smbtmr = PSC_SMBTMR_SET_TH(0) | PSC_SMBTMR_SET_PS(15) | \
PSC_SMBTMR_SET_PU(15) | PSC_SMBTMR_SET_SH(15) | \
PSC_SMBTMR_SET_SU(15) | PSC_SMBTMR_SET_CL(15) | \
PSC_SMBTMR_SET_CH(15);
au_sync();
sp->psc_smbcfg |= PSC_SMBCFG_DE_ENABLE;
do {
stat = sp->psc_smbstat;
au_sync();
} while ((stat & PSC_SMBSTAT_DR) == 0);
ret = i2c_add_numbered_adapter(&priv->adap);
if (ret == 0) {
platform_set_drvdata(pdev, priv);
return 0;
}
/* disable the PSC */
sp->psc_smbcfg = 0;
sp->psc_ctrl = PSC_CTRL_DISABLE;
au_sync();
release_resource(priv->ioarea);
kfree(priv->ioarea);
out_mem:
kfree(priv);
out:
return ret;
}