Commit c33a004c authored by Linus Walleij's avatar Linus Walleij Committed by Wolfram Sang
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i2c: nomadik: factor platform data into state container



Move the former platform data struct nmk_i2c_controller into the
per-device state container struct i2c_nmk_client, and remove all
the platform data probe path hacks.

Signed-off-by: default avatarLinus Walleij <linus.walleij@linaro.org>
[wsa: use 100kHz as default]
Signed-off-by: default avatarWolfram Sang <wsa@the-dreams.de>
parent e8936455
......@@ -110,22 +110,6 @@ enum i2c_freq_mode {
I2C_FREQ_MODE_FAST_PLUS, /* up to 1 Mb/s */
};
/**
* struct nmk_i2c_controller - client specific controller configuration
* @clk_freq: clock frequency for the operation mode
* @tft: Tx FIFO Threshold in bytes
* @rft: Rx FIFO Threshold in bytes
* @timeout Slave response timeout(ms)
* @sm: speed mode
*/
struct nmk_i2c_controller {
u32 clk_freq;
unsigned char tft;
unsigned char rft;
int timeout;
enum i2c_freq_mode sm;
};
/**
* struct i2c_vendor_data - per-vendor variations
* @has_mtdws: variant has the MTDWS bit
......@@ -174,8 +158,12 @@ struct i2c_nmk_client {
* @irq: interrupt line for the controller.
* @virtbase: virtual io memory area.
* @clk: hardware i2c block clock.
* @cfg: machine provided controller configuration.
* @cli: holder of client specific data.
* @clk_freq: clock frequency for the operation mode
* @tft: Tx FIFO Threshold in bytes
* @rft: Rx FIFO Threshold in bytes
* @timeout Slave response timeout (ms)
* @sm: speed mode
* @stop: stop condition.
* @xfer_complete: acknowledge completion for a I2C message.
* @result: controller propogated result.
......@@ -188,8 +176,12 @@ struct nmk_i2c_dev {
int irq;
void __iomem *virtbase;
struct clk *clk;
struct nmk_i2c_controller cfg;
struct i2c_nmk_client cli;
u32 clk_freq;
unsigned char tft;
unsigned char rft;
int timeout;
enum i2c_freq_mode sm;
int stop;
struct completion xfer_complete;
int result;
......@@ -386,7 +378,7 @@ static void setup_i2c_controller(struct nmk_i2c_dev *dev)
* slsu = cycles / (1000000000 / f) + 1
*/
ns = DIV_ROUND_UP_ULL(1000000000ULL, i2c_clk);
switch (dev->cfg.sm) {
switch (dev->sm) {
case I2C_FREQ_MODE_FAST:
case I2C_FREQ_MODE_FAST_PLUS:
slsu = DIV_ROUND_UP(100, ns); /* Fast */
......@@ -409,7 +401,7 @@ static void setup_i2c_controller(struct nmk_i2c_dev *dev)
* 2 whereas it is 3 for fast and fastplus mode of
* operation. TODO - high speed support.
*/
div = (dev->cfg.clk_freq > 100000) ? 3 : 2;
div = (dev->clk_freq > 100000) ? 3 : 2;
/*
* generate the mask for baud rate counters. The controller
......@@ -419,7 +411,7 @@ static void setup_i2c_controller(struct nmk_i2c_dev *dev)
* so set brcr1 to 0.
*/
brcr1 = 0 << 16;
brcr2 = (i2c_clk/(dev->cfg.clk_freq * div)) & 0xffff;
brcr2 = (i2c_clk/(dev->clk_freq * div)) & 0xffff;
/* set the baud rate counter register */
writel((brcr1 | brcr2), dev->virtbase + I2C_BRCR);
......@@ -430,7 +422,7 @@ static void setup_i2c_controller(struct nmk_i2c_dev *dev)
* TODO - support for fast mode plus (up to 1Mb/s)
* and high speed (up to 3.4 Mb/s)
*/
if (dev->cfg.sm > I2C_FREQ_MODE_FAST) {
if (dev->sm > I2C_FREQ_MODE_FAST) {
dev_err(&dev->adev->dev,
"do not support this mode defaulting to std. mode\n");
brcr2 = i2c_clk/(100000 * 2) & 0xffff;
......@@ -438,11 +430,11 @@ static void setup_i2c_controller(struct nmk_i2c_dev *dev)
writel(I2C_FREQ_MODE_STANDARD << 4,
dev->virtbase + I2C_CR);
}
writel(dev->cfg.sm << 4, dev->virtbase + I2C_CR);
writel(dev->sm << 4, dev->virtbase + I2C_CR);
/* set the Tx and Rx FIFO threshold */
writel(dev->cfg.tft, dev->virtbase + I2C_TFTR);
writel(dev->cfg.rft, dev->virtbase + I2C_RFTR);
writel(dev->tft, dev->virtbase + I2C_TFTR);
writel(dev->rft, dev->virtbase + I2C_RFTR);
}
/**
......@@ -958,63 +950,32 @@ static const struct i2c_algorithm nmk_i2c_algo = {
.functionality = nmk_i2c_functionality
};
static struct nmk_i2c_controller u8500_i2c = {
.tft = 1, /* Tx FIFO threshold */
.rft = 8, /* Rx FIFO threshold */
.clk_freq = 400000, /* fast mode operation */
.timeout = 200, /* Slave response timeout(ms) */
.sm = I2C_FREQ_MODE_FAST,
};
static void nmk_i2c_of_probe(struct device_node *np,
struct nmk_i2c_controller *pdata)
struct nmk_i2c_dev *nmk)
{
of_property_read_u32(np, "clock-frequency", &pdata->clk_freq);
/* Default to 100 kHz if no frequency is given in the node */
if (of_property_read_u32(np, "clock-frequency", &nmk->clk_freq))
nmk->clk_freq = 100000;
/* This driver only supports 'standard' and 'fast' modes of operation. */
if (pdata->clk_freq <= 100000)
pdata->sm = I2C_FREQ_MODE_STANDARD;
if (nmk->clk_freq <= 100000)
nmk->sm = I2C_FREQ_MODE_STANDARD;
else
pdata->sm = I2C_FREQ_MODE_FAST;
nmk->sm = I2C_FREQ_MODE_FAST;
nmk->tft = 1; /* Tx FIFO threshold */
nmk->rft = 8; /* Rx FIFO threshold */
nmk->timeout = 200; /* Slave response timeout(ms) */
}
static int nmk_i2c_probe(struct amba_device *adev, const struct amba_id *id)
{
int ret = 0;
struct nmk_i2c_controller *pdata = dev_get_platdata(&adev->dev);
struct device_node *np = adev->dev.of_node;
struct nmk_i2c_dev *dev;
struct i2c_adapter *adap;
struct i2c_vendor_data *vendor = id->data;
u32 max_fifo_threshold = (vendor->fifodepth / 2) - 1;
if (!pdata) {
if (np) {
pdata = devm_kzalloc(&adev->dev, sizeof(*pdata), GFP_KERNEL);
if (!pdata) {
ret = -ENOMEM;
goto err_no_mem;
}
/* Provide the default configuration as a base. */
memcpy(pdata, &u8500_i2c, sizeof(struct nmk_i2c_controller));
nmk_i2c_of_probe(np, pdata);
} else
/* No i2c configuration found, using the default. */
pdata = &u8500_i2c;
}
if (pdata->tft > max_fifo_threshold) {
dev_warn(&adev->dev, "requested TX FIFO threshold %u, adjusted down to %u\n",
pdata->tft, max_fifo_threshold);
pdata->tft = max_fifo_threshold;
}
if (pdata->rft > max_fifo_threshold) {
dev_warn(&adev->dev, "requested RX FIFO threshold %u, adjusted down to %u\n",
pdata->rft, max_fifo_threshold);
pdata->rft = max_fifo_threshold;
}
dev = kzalloc(sizeof(struct nmk_i2c_dev), GFP_KERNEL);
if (!dev) {
dev_err(&adev->dev, "cannot allocate memory\n");
......@@ -1024,6 +985,20 @@ static int nmk_i2c_probe(struct amba_device *adev, const struct amba_id *id)
dev->vendor = vendor;
dev->busy = false;
dev->adev = adev;
nmk_i2c_of_probe(np, dev);
if (dev->tft > max_fifo_threshold) {
dev_warn(&adev->dev, "requested TX FIFO threshold %u, adjusted down to %u\n",
dev->tft, max_fifo_threshold);
dev->tft = max_fifo_threshold;
}
if (dev->rft > max_fifo_threshold) {
dev_warn(&adev->dev, "requested RX FIFO threshold %u, adjusted down to %u\n",
dev->rft, max_fifo_threshold);
dev->rft = max_fifo_threshold;
}
amba_set_drvdata(adev, dev);
/* Select default pin state */
......@@ -1060,16 +1035,10 @@ static int nmk_i2c_probe(struct amba_device *adev, const struct amba_id *id)
adap->owner = THIS_MODULE;
adap->class = I2C_CLASS_HWMON | I2C_CLASS_SPD;
adap->algo = &nmk_i2c_algo;
adap->timeout = msecs_to_jiffies(pdata->timeout);
adap->timeout = msecs_to_jiffies(dev->timeout);
snprintf(adap->name, sizeof(adap->name),
"Nomadik I2C at %pR", &adev->res);
/* fetch the controller configuration from machine */
dev->cfg.clk_freq = pdata->clk_freq;
dev->cfg.tft = pdata->tft;
dev->cfg.rft = pdata->rft;
dev->cfg.sm = pdata->sm;
i2c_set_adapdata(adap, dev);
dev_info(&adev->dev,
......
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