From c33a004c9568cbd4b944a1ab293289822e6d562d Mon Sep 17 00:00:00 2001 From: Linus Walleij Date: Mon, 3 Feb 2014 11:27:26 +0100 Subject: [PATCH] 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: Linus Walleij [wsa: use 100kHz as default] Signed-off-by: Wolfram Sang --- drivers/i2c/busses/i2c-nomadik.c | 115 +++++++++++-------------------- 1 file changed, 42 insertions(+), 73 deletions(-) diff --git a/drivers/i2c/busses/i2c-nomadik.c b/drivers/i2c/busses/i2c-nomadik.c index 4443613514ee..e2a890d84fb7 100644 --- a/drivers/i2c/busses/i2c-nomadik.c +++ b/drivers/i2c/busses/i2c-nomadik.c @@ -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, -- 2.20.1