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Commit 9f9d6a40 authored by Masahiro Yamada's avatar Masahiro Yamada Committed by Wolfram Sang
Browse files

i2c: uniphier: add suspend / resume support 



When resuming, set up registers that have been lost in the sleep state.
Also, add clock handling in the resume / suspend hooks.

Signed-off-by: default avatarMasahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: default avatarWolfram Sang <wsa@the-dreams.de>
parent 8dc0f8c7

drivers/i2c/busses/i2c-uniphier.c

+35 −5
Original line number Diff line number Diff line
@@ -53,6 +53,7 @@ struct uniphier_i2c_priv { 
	void __iomem *membase;

	struct clk *clk;

	unsigned int busy_cnt;

	unsigned int clk_cycle;

};



static irqreturn_t uniphier_i2c_interrupt(int irq, void *dev_id)
@@ -316,13 +317,13 @@ static struct i2c_bus_recovery_info uniphier_i2c_bus_recovery_info = { 
	.unprepare_recovery = uniphier_i2c_unprepare_recovery,

};



static void uniphier_i2c_hw_init(struct uniphier_i2c_priv *priv,

				 u32 bus_speed, unsigned long clk_rate)

static void uniphier_i2c_hw_init(struct uniphier_i2c_priv *priv)

{

	unsigned int cyc = priv->clk_cycle;



	uniphier_i2c_reset(priv, true);



	writel((clk_rate / bus_speed / 2 << 16) | (clk_rate / bus_speed),

	       priv->membase + UNIPHIER_I2C_CLK);

	writel((cyc / 2 << 16) | cyc, priv->membase + UNIPHIER_I2C_CLK);



	uniphier_i2c_reset(priv, false);

}
@@ -376,6 +377,7 @@ static int uniphier_i2c_probe(struct platform_device *pdev) 
		goto disable_clk;

	}



	priv->clk_cycle = clk_rate / bus_speed;

	init_completion(&priv->comp);

	priv->adap.owner = THIS_MODULE;

	priv->adap.algo = &uniphier_i2c_algo;
@@ -386,7 +388,7 @@ static int uniphier_i2c_probe(struct platform_device *pdev) 
	i2c_set_adapdata(&priv->adap, priv);

	platform_set_drvdata(pdev, priv);



	uniphier_i2c_hw_init(priv, bus_speed, clk_rate);

	uniphier_i2c_hw_init(priv);



	ret = devm_request_irq(dev, irq, uniphier_i2c_interrupt, 0, pdev->name,

			       priv);
@@ -413,6 +415,33 @@ static int uniphier_i2c_remove(struct platform_device *pdev) 
	return 0;

}



static int __maybe_unused uniphier_i2c_suspend(struct device *dev)

{

	struct uniphier_i2c_priv *priv = dev_get_drvdata(dev);



	clk_disable_unprepare(priv->clk);



	return 0;

}



static int __maybe_unused uniphier_i2c_resume(struct device *dev)

{

	struct uniphier_i2c_priv *priv = dev_get_drvdata(dev);

	int ret;



	ret = clk_prepare_enable(priv->clk);

	if (ret)

		return ret;



	uniphier_i2c_hw_init(priv);



	return 0;

}



static const struct dev_pm_ops uniphier_i2c_pm_ops = {

	SET_SYSTEM_SLEEP_PM_OPS(uniphier_i2c_suspend, uniphier_i2c_resume)

};



static const struct of_device_id uniphier_i2c_match[] = {

	{ .compatible = "socionext,uniphier-i2c" },

	{ /* sentinel */ }
@@ -425,6 +454,7 @@ static struct platform_driver uniphier_i2c_drv = { 
	.driver = {

		.name  = "uniphier-i2c",

		.of_match_table = uniphier_i2c_match,

		.pm = &uniphier_i2c_pm_ops,

	},

};

module_platform_driver(uniphier_i2c_drv);