i2c-algo-pca: Add PCA9665 support
Add support for the PCA9665 I2C controller. Signed-off-by: Wolfram Sang <w.sang@pengutronix.de> Signed-off-by: Jean Delvare <khali@linux-fr.org>
This commit is contained in:
Marco Aurelio da Costa
Jean Delvare
Родитель
bac3e7c2aa
Коммит
eff9ec95ef
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@ -46,6 +46,14 @@ static int i2c_debug;
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#define pca_wait(adap) adap->wait_for_completion(adap->data)
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#define pca_reset(adap) adap->reset_chip(adap->data)
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static void pca9665_reset(void *pd)
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{
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struct i2c_algo_pca_data *adap = pd;
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pca_outw(adap, I2C_PCA_INDPTR, I2C_PCA_IPRESET);
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pca_outw(adap, I2C_PCA_IND, 0xA5);
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pca_outw(adap, I2C_PCA_IND, 0x5A);
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}
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/*
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* Generate a start condition on the i2c bus.
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*
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@ -333,27 +341,171 @@ static const struct i2c_algorithm pca_algo = {
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.functionality = pca_func,
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};
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static unsigned int pca_probe_chip(struct i2c_adapter *adap)
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{
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struct i2c_algo_pca_data *pca_data = adap->algo_data;
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/* The trick here is to check if there is an indirect register
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* available. If there is one, we will read the value we first
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* wrote on I2C_PCA_IADR. Otherwise, we will read the last value
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* we wrote on I2C_PCA_ADR
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*/
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pca_outw(pca_data, I2C_PCA_INDPTR, I2C_PCA_IADR);
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pca_outw(pca_data, I2C_PCA_IND, 0xAA);
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pca_outw(pca_data, I2C_PCA_INDPTR, I2C_PCA_ITO);
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pca_outw(pca_data, I2C_PCA_IND, 0x00);
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pca_outw(pca_data, I2C_PCA_INDPTR, I2C_PCA_IADR);
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if (pca_inw(pca_data, I2C_PCA_IND) == 0xAA) {
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printk(KERN_INFO "%s: PCA9665 detected.\n", adap->name);
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return I2C_PCA_CHIP_9665;
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} else {
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printk(KERN_INFO "%s: PCA9564 detected.\n", adap->name);
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return I2C_PCA_CHIP_9564;
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}
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}
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static int pca_init(struct i2c_adapter *adap)
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{
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static int freqs[] = {330,288,217,146,88,59,44,36};
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int clock;
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struct i2c_algo_pca_data *pca_data = adap->algo_data;
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if (pca_data->i2c_clock > 7) {
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printk(KERN_WARNING "%s: Invalid I2C clock speed selected. Trying default.\n",
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adap->name);
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pca_data->i2c_clock = I2C_PCA_CON_59kHz;
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}
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adap->algo = &pca_algo;
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pca_reset(pca_data);
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if (pca_probe_chip(adap) == I2C_PCA_CHIP_9564) {
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static int freqs[] = {330, 288, 217, 146, 88, 59, 44, 36};
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int clock;
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clock = pca_clock(pca_data);
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printk(KERN_INFO "%s: Clock frequency is %dkHz\n", adap->name,
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freqs[clock]);
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if (pca_data->i2c_clock > 7) {
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switch (pca_data->i2c_clock) {
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case 330000:
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pca_data->i2c_clock = I2C_PCA_CON_330kHz;
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break;
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case 288000:
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pca_data->i2c_clock = I2C_PCA_CON_288kHz;
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break;
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case 217000:
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pca_data->i2c_clock = I2C_PCA_CON_217kHz;
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break;
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case 146000:
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pca_data->i2c_clock = I2C_PCA_CON_146kHz;
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break;
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case 88000:
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pca_data->i2c_clock = I2C_PCA_CON_88kHz;
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break;
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case 59000:
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pca_data->i2c_clock = I2C_PCA_CON_59kHz;
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break;
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case 44000:
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pca_data->i2c_clock = I2C_PCA_CON_44kHz;
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break;
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case 36000:
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pca_data->i2c_clock = I2C_PCA_CON_36kHz;
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break;
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default:
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printk(KERN_WARNING
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"%s: Invalid I2C clock speed selected."
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" Using default 59kHz.\n", adap->name);
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pca_data->i2c_clock = I2C_PCA_CON_59kHz;
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}
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} else {
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printk(KERN_WARNING "%s: "
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"Choosing the clock frequency based on "
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"index is deprecated."
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" Use the nominal frequency.\n", adap->name);
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}
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pca_set_con(pca_data, I2C_PCA_CON_ENSIO | clock);
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pca_reset(pca_data);
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clock = pca_clock(pca_data);
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printk(KERN_INFO "%s: Clock frequency is %dkHz\n",
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adap->name, freqs[clock]);
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pca_set_con(pca_data, I2C_PCA_CON_ENSIO | clock);
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} else {
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int clock;
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int mode;
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int tlow, thi;
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/* Values can be found on PCA9665 datasheet section 7.3.2.6 */
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int min_tlow, min_thi;
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/* These values are the maximum raise and fall values allowed
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* by the I2C operation mode (Standard, Fast or Fast+)
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* They are used (added) below to calculate the clock dividers
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* of PCA9665. Note that they are slightly different of the
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* real maximum, to allow the change on mode exactly on the
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* maximum clock rate for each mode
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*/
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int raise_fall_time;
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struct i2c_algo_pca_data *pca_data = adap->algo_data;
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/* Ignore the reset function from the module,
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* we can use the parallel bus reset
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*/
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pca_data->reset_chip = pca9665_reset;
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if (pca_data->i2c_clock > 1265800) {
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printk(KERN_WARNING "%s: I2C clock speed too high."
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" Using 1265.8kHz.\n", adap->name);
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pca_data->i2c_clock = 1265800;
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}
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if (pca_data->i2c_clock < 60300) {
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printk(KERN_WARNING "%s: I2C clock speed too low."
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" Using 60.3kHz.\n", adap->name);
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pca_data->i2c_clock = 60300;
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}
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/* To avoid integer overflow, use clock/100 for calculations */
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clock = pca_clock(pca_data) / 100;
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if (pca_data->i2c_clock > 10000) {
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mode = I2C_PCA_MODE_TURBO;
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min_tlow = 14;
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min_thi = 5;
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raise_fall_time = 22; /* Raise 11e-8s, Fall 11e-8s */
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} else if (pca_data->i2c_clock > 4000) {
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mode = I2C_PCA_MODE_FASTP;
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min_tlow = 17;
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min_thi = 9;
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raise_fall_time = 22; /* Raise 11e-8s, Fall 11e-8s */
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} else if (pca_data->i2c_clock > 1000) {
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mode = I2C_PCA_MODE_FAST;
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min_tlow = 44;
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min_thi = 20;
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raise_fall_time = 58; /* Raise 29e-8s, Fall 29e-8s */
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} else {
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mode = I2C_PCA_MODE_STD;
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min_tlow = 157;
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min_thi = 134;
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raise_fall_time = 127; /* Raise 29e-8s, Fall 98e-8s */
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}
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/* The minimum clock that respects the thi/tlow = 134/157 is
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* 64800 Hz. Below that, we have to fix the tlow to 255 and
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* calculate the thi factor.
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*/
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if (clock < 648) {
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tlow = 255;
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thi = 1000000 - clock * raise_fall_time;
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thi /= (I2C_PCA_OSC_PER * clock) - tlow;
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} else {
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tlow = (1000000 - clock * raise_fall_time) * min_tlow;
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tlow /= I2C_PCA_OSC_PER * clock * (min_thi + min_tlow);
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thi = tlow * min_thi / min_tlow;
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}
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pca_reset(pca_data);
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printk(KERN_INFO
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"%s: Clock frequency is %dHz\n", adap->name, clock * 100);
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pca_outw(pca_data, I2C_PCA_INDPTR, I2C_PCA_IMODE);
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pca_outw(pca_data, I2C_PCA_IND, mode);
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pca_outw(pca_data, I2C_PCA_INDPTR, I2C_PCA_ISCLL);
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pca_outw(pca_data, I2C_PCA_IND, tlow);
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pca_outw(pca_data, I2C_PCA_INDPTR, I2C_PCA_ISCLH);
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pca_outw(pca_data, I2C_PCA_IND, thi);
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pca_set_con(pca_data, I2C_PCA_CON_ENSIO);
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}
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udelay(500); /* 500 us for oscilator to stabilise */
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return 0;
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@ -388,7 +540,7 @@ EXPORT_SYMBOL(i2c_pca_add_numbered_bus);
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MODULE_AUTHOR("Ian Campbell <icampbell@arcom.com>, "
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"Wolfram Sang <w.sang@pengutronix.de>");
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MODULE_DESCRIPTION("I2C-Bus PCA9564 algorithm");
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MODULE_DESCRIPTION("I2C-Bus PCA9564/PCA9665 algorithm");
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MODULE_LICENSE("GPL");
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module_param(i2c_debug, int, 0);
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@ -617,12 +617,12 @@ config I2C_ELEKTOR
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will be called i2c-elektor.
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config I2C_PCA_ISA
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tristate "PCA9564 on an ISA bus"
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tristate "PCA9564/PCA9665 on an ISA bus"
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depends on ISA
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select I2C_ALGOPCA
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default n
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help
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This driver supports ISA boards using the Philips PCA9564
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This driver supports ISA boards using the Philips PCA9564/PCA9665
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parallel bus to I2C bus controller.
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This driver can also be built as a module. If so, the module
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@ -634,11 +634,11 @@ config I2C_PCA_ISA
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time). If unsure, say N.
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config I2C_PCA_PLATFORM
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tristate "PCA9564 as platform device"
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tristate "PCA9564/PCA9665 as platform device"
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select I2C_ALGOPCA
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default n
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help
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This driver supports a memory mapped Philips PCA9564
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This driver supports a memory mapped Philips PCA9564/PCA9665
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parallel bus to I2C bus controller.
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This driver can also be built as a module. If so, the module
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@ -41,7 +41,7 @@ static int irq = -1;
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/* Data sheet recommends 59kHz for 100kHz operation due to variation
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* in the actual clock rate */
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static int clock = I2C_PCA_CON_59kHz;
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static int clock = 59000;
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static wait_queue_head_t pca_wait;
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@ -103,7 +103,7 @@ static struct i2c_algo_pca_data pca_isa_data = {
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static struct i2c_adapter pca_isa_ops = {
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.owner = THIS_MODULE,
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.algo_data = &pca_isa_data,
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.name = "PCA9564 ISA Adapter",
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.name = "PCA9564/PCA9665 ISA Adapter",
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.timeout = 100,
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};
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@ -196,7 +196,7 @@ static void __exit pca_isa_exit(void)
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}
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MODULE_AUTHOR("Ian Campbell <icampbell@arcom.com>");
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MODULE_DESCRIPTION("ISA base PCA9564 driver");
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MODULE_DESCRIPTION("ISA base PCA9564/PCA9665 driver");
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MODULE_LICENSE("GPL");
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module_param(base, ulong, 0);
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@ -205,7 +205,13 @@ MODULE_PARM_DESC(base, "I/O base address");
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module_param(irq, int, 0);
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MODULE_PARM_DESC(irq, "IRQ");
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module_param(clock, int, 0);
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MODULE_PARM_DESC(clock, "Clock rate as described in table 1 of PCA9564 datasheet");
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MODULE_PARM_DESC(clock, "Clock rate in hertz.\n\t\t"
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"For PCA9564: 330000,288000,217000,146000,"
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"88000,59000,44000,36000\n"
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"\t\tFor PCA9665:\tStandard: 60300 - 100099\n"
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"\t\t\t\tFast: 100100 - 400099\n"
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"\t\t\t\tFast+: 400100 - 10000099\n"
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"\t\t\t\tTurbo: Up to 1265800");
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module_init(pca_isa_init);
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module_exit(pca_isa_exit);
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@ -172,8 +172,9 @@ static int __devinit i2c_pca_pf_probe(struct platform_device *pdev)
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i2c->adap.nr = pdev->id >= 0 ? pdev->id : 0;
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i2c->adap.owner = THIS_MODULE;
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snprintf(i2c->adap.name, sizeof(i2c->adap.name), "PCA9564 at 0x%08lx",
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(unsigned long) res->start);
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snprintf(i2c->adap.name, sizeof(i2c->adap.name),
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"PCA9564/PCA9665 at 0x%08lx",
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(unsigned long) res->start);
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i2c->adap.algo_data = &i2c->algo_data;
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i2c->adap.dev.parent = &pdev->dev;
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i2c->adap.timeout = platform_data->timeout;
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@ -246,7 +247,7 @@ e_remap:
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e_alloc:
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release_mem_region(res->start, res_len(res));
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e_print:
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printk(KERN_ERR "Registering PCA9564 FAILED! (%d)\n", ret);
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printk(KERN_ERR "Registering PCA9564/PCA9665 FAILED! (%d)\n", ret);
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return ret;
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}
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@ -290,7 +291,7 @@ static void __exit i2c_pca_pf_exit(void)
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}
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MODULE_AUTHOR("Wolfram Sang <w.sang@pengutronix.de>");
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MODULE_DESCRIPTION("I2C-PCA9564 platform driver");
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MODULE_DESCRIPTION("I2C-PCA9564/PCA9665 platform driver");
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MODULE_LICENSE("GPL");
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module_init(i2c_pca_pf_init);
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@ -1,7 +1,14 @@
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#ifndef _LINUX_I2C_ALGO_PCA_H
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#define _LINUX_I2C_ALGO_PCA_H
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/* Clock speeds for the bus */
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/* Chips known to the pca algo */
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#define I2C_PCA_CHIP_9564 0x00
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#define I2C_PCA_CHIP_9665 0x01
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/* Internal period for PCA9665 oscilator */
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#define I2C_PCA_OSC_PER 3 /* e10-8s */
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/* Clock speeds for the bus for PCA9564*/
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#define I2C_PCA_CON_330kHz 0x00
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#define I2C_PCA_CON_288kHz 0x01
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#define I2C_PCA_CON_217kHz 0x02
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@ -18,6 +25,26 @@
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#define I2C_PCA_ADR 0x02 /* OWN ADR Read/Write */
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#define I2C_PCA_CON 0x03 /* CONTROL Read/Write */
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/* PCA9665 registers */
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#define I2C_PCA_INDPTR 0x00 /* INDIRECT Pointer Write Only */
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#define I2C_PCA_IND 0x02 /* INDIRECT Read/Write */
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/* PCA9665 indirect registers */
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#define I2C_PCA_ICOUNT 0x00 /* Byte Count for buffered mode */
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#define I2C_PCA_IADR 0x01 /* OWN ADR */
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#define I2C_PCA_ISCLL 0x02 /* SCL LOW period */
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#define I2C_PCA_ISCLH 0x03 /* SCL HIGH period */
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#define I2C_PCA_ITO 0x04 /* TIMEOUT */
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#define I2C_PCA_IPRESET 0x05 /* Parallel bus reset */
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#define I2C_PCA_IMODE 0x06 /* I2C Bus mode */
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/* PCA9665 I2C bus mode */
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#define I2C_PCA_MODE_STD 0x00 /* Standard mode */
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#define I2C_PCA_MODE_FAST 0x01 /* Fast mode */
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#define I2C_PCA_MODE_FASTP 0x02 /* Fast Plus mode */
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#define I2C_PCA_MODE_TURBO 0x03 /* Turbo mode */
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#define I2C_PCA_CON_AA 0x80 /* Assert Acknowledge */
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#define I2C_PCA_CON_ENSIO 0x40 /* Enable */
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#define I2C_PCA_CON_STA 0x20 /* Start */
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@ -31,7 +58,9 @@ struct i2c_algo_pca_data {
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int (*read_byte) (void *data, int reg);
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int (*wait_for_completion) (void *data);
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void (*reset_chip) (void *data);
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/* i2c_clock values are defined in linux/i2c-algo-pca.h */
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/* For PCA9564, use one of the predefined frequencies:
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* 330000, 288000, 217000, 146000, 88000, 59000, 44000, 36000
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* For PCA9665, use the frequency you want here. */
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unsigned int i2c_clock;
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};
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