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staging: nvec: rework the nvec slave init 

Rework the tegra slave controller init to look more like in
tegra-i2c.c. This makes the nvec init reliable. Also add de-init of
the slave to be used during suspend.

Signed-off-by: Marc Dietrich <marvin24@gmx.de>
Signed-off-by: Julian Andres Klode <jak@jak-linux.org>
Acked-by: Marc Dietrich <marvin24@gmx.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
hifive-unleashed-5.1
Marc Dietrich 2011-09-27 19:00:42 +02:00 committed by Greg Kroah-Hartman
parent a3a9aa1a41
commit ac8107599e
1 changed files with 21 additions and 8 deletions
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29
drivers/staging/nvec/nvec.c
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@ -282,18 +282,30 @@ static void tegra_init_i2c_slave(struct nvec_chip *nvec)
udelay(2);
tegra_periph_reset_deassert(nvec->i2c_clk);
val = I2C_CNFG_NEW_MASTER_SFM | I2C_CNFG_PACKET_MODE_EN |
(0x2 << I2C_CNFG_DEBOUNCE_CNT_SHIFT);
writel(val, nvec->base + I2C_CNFG);
clk_set_rate(nvec->i2c_clk, 8 * 80000);
writel(I2C_SL_NEWL, nvec->base + I2C_SL_CNFG);
writel(0x1E, nvec->base + I2C_SL_DELAY_COUNT);
writel(nvec->i2c_addr>>1, nvec->base + I2C_SL_ADDR1);
writel(0, nvec->base + I2C_SL_ADDR2);
writel(0x1E, nvec->base + I2C_SL_DELAY_COUNT);
val = I2C_CNFG_NEW_MASTER_SFM | I2C_CNFG_PACKET_MODE_EN |
(0x2 << I2C_CNFG_DEBOUNCE_CNT_SHIFT);
writel(val, nvec->base + I2C_CNFG);
writel(I2C_SL_NEWL, nvec->base + I2C_SL_CNFG);
enable_irq(nvec->irq);
clk_disable(nvec->i2c_clk);
}
static void nvec_disable_i2c_slave(struct nvec_chip *nvec)
{
disable_irq(nvec->irq);
writel(I2C_SL_NEWL | I2C_SL_NACK, nvec->base + I2C_SL_CNFG);
clk_disable(nvec->i2c_clk);
}
static void nvec_power_off(void)
{
nvec_write_async(nvec_power_handle, EC_DISABLE_EVENT_REPORTING, 3);
@ -352,9 +364,6 @@ static int __devinit tegra_nvec_probe(struct platform_device *pdev)
goto err_iounmap;
}
clk_enable(i2c_clk);
clk_set_rate(i2c_clk, 8*80000);
nvec->base = base;
nvec->irq = res->start;
nvec->i2c_clk = i2c_clk;
@ -378,9 +387,12 @@ static int __devinit tegra_nvec_probe(struct platform_device *pdev)
dev_err(nvec->dev, "couldn't request irq\n");
goto failed;
}
disable_irq(nvec->irq);
tegra_init_i2c_slave(nvec);
clk_enable(i2c_clk);
gpio_direction_output(nvec->gpio, 1);
gpio_set_value(nvec->gpio, 1);
@ -450,6 +462,7 @@ static int tegra_nvec_suspend(struct platform_device *pdev, pm_message_t state)
dev_dbg(nvec->dev, "suspending\n");
nvec_write_async(nvec, EC_DISABLE_EVENT_REPORTING, 3);
nvec_write_async(nvec, "\x04\x02", 2);
nvec_disable_i2c_slave(nvec);
return 0;
}