summaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
Diffstat
-rw-r--r--drivers/i2c/algos/i2c-algo-pca.c180
-rw-r--r--drivers/i2c/busses/Kconfig8
-rw-r--r--drivers/i2c/busses/i2c-pca-isa.c14
-rw-r--r--drivers/i2c/busses/i2c-pca-platform.c9
-rw-r--r--include/linux/i2c-algo-pca.h33
5 files changed, 216 insertions, 28 deletions
diff --git a/drivers/i2c/algos/i2c-algo-pca.c b/drivers/i2c/algos/i2c-algo-pca.c
index 943d70ee5d59..a8e51bd1a4f5 100644
--- a/drivers/i2c/algos/i2c-algo-pca.c
+++ b/drivers/i2c/algos/i2c-algo-pca.c
@@ -46,6 +46,14 @@ static int i2c_debug;
#define pca_wait(adap) adap->wait_for_completion(adap->data)
#define pca_reset(adap) adap->reset_chip(adap->data)
+static void pca9665_reset(void *pd)
+{
+ struct i2c_algo_pca_data *adap = pd;
+ pca_outw(adap, I2C_PCA_INDPTR, I2C_PCA_IPRESET);
+ pca_outw(adap, I2C_PCA_IND, 0xA5);
+ pca_outw(adap, I2C_PCA_IND, 0x5A);
+}
+
/*
* Generate a start condition on the i2c bus.
*
@@ -333,27 +341,171 @@ static const struct i2c_algorithm pca_algo = {
.functionality = pca_func,
};
-static int pca_init(struct i2c_adapter *adap)
+static unsigned int pca_probe_chip(struct i2c_adapter *adap)
{
- static int freqs[] = {330,288,217,146,88,59,44,36};
- int clock;
struct i2c_algo_pca_data *pca_data = adap->algo_data;
-
- if (pca_data->i2c_clock > 7) {
- printk(KERN_WARNING "%s: Invalid I2C clock speed selected. Trying default.\n",
- adap->name);
- pca_data->i2c_clock = I2C_PCA_CON_59kHz;
+ /* The trick here is to check if there is an indirect register
+ * available. If there is one, we will read the value we first
+ * wrote on I2C_PCA_IADR. Otherwise, we will read the last value
+ * we wrote on I2C_PCA_ADR
+ */
+ pca_outw(pca_data, I2C_PCA_INDPTR, I2C_PCA_IADR);
+ pca_outw(pca_data, I2C_PCA_IND, 0xAA);
+ pca_outw(pca_data, I2C_PCA_INDPTR, I2C_PCA_ITO);
+ pca_outw(pca_data, I2C_PCA_IND, 0x00);
+ pca_outw(pca_data, I2C_PCA_INDPTR, I2C_PCA_IADR);
+ if (pca_inw(pca_data, I2C_PCA_IND) == 0xAA) {
+ printk(KERN_INFO "%s: PCA9665 detected.\n", adap->name);
+ return I2C_PCA_CHIP_9665;
+ } else {
+ printk(KERN_INFO "%s: PCA9564 detected.\n", adap->name);
+ return I2C_PCA_CHIP_9564;
}
+}
+
+static int pca_init(struct i2c_adapter *adap)
+{
+ struct i2c_algo_pca_data *pca_data = adap->algo_data;
adap->algo = &pca_algo;
- pca_reset(pca_data);
+ if (pca_probe_chip(adap) == I2C_PCA_CHIP_9564) {
+ static int freqs[] = {330, 288, 217, 146, 88, 59, 44, 36};
+ int clock;
+
+ if (pca_data->i2c_clock > 7) {
+ switch (pca_data->i2c_clock) {
+ case 330000:
+ pca_data->i2c_clock = I2C_PCA_CON_330kHz;
+ break;
+ case 288000:
+ pca_data->i2c_clock = I2C_PCA_CON_288kHz;
+ break;
+ case 217000:
+ pca_data->i2c_clock = I2C_PCA_CON_217kHz;
+ break;
+ case 146000:
+ pca_data->i2c_clock = I2C_PCA_CON_146kHz;
+ break;
+ case 88000:
+ pca_data->i2c_clock = I2C_PCA_CON_88kHz;
+ break;
+ case 59000:
+ pca_data->i2c_clock = I2C_PCA_CON_59kHz;
+ break;
+ case 44000:
+ pca_data->i2c_clock = I2C_PCA_CON_44kHz;
+ break;
+ case 36000:
+ pca_data->i2c_clock = I2C_PCA_CON_36kHz;
+ break;
+ default:
+ printk(KERN_WARNING
+ "%s: Invalid I2C clock speed selected."
+ " Using default 59kHz.\n", adap->name);
+ pca_data->i2c_clock = I2C_PCA_CON_59kHz;
+ }
+ } else {
+ printk(KERN_WARNING "%s: "
+ "Choosing the clock frequency based on "
+ "index is deprecated."
+ " Use the nominal frequency.\n", adap->name);
+ }
+
+ pca_reset(pca_data);
+
+ clock = pca_clock(pca_data);
+ printk(KERN_INFO "%s: Clock frequency is %dkHz\n",
+ adap->name, freqs[clock]);
+
+ pca_set_con(pca_data, I2C_PCA_CON_ENSIO | clock);
+ } else {
+ int clock;
+ int mode;
+ int tlow, thi;
+ /* Values can be found on PCA9665 datasheet section 7.3.2.6 */
+ int min_tlow, min_thi;
+ /* These values are the maximum raise and fall values allowed
+ * by the I2C operation mode (Standard, Fast or Fast+)
+ * They are used (added) below to calculate the clock dividers
+ * of PCA9665. Note that they are slightly different of the
+ * real maximum, to allow the change on mode exactly on the
+ * maximum clock rate for each mode
+ */
+ int raise_fall_time;
+
+ struct i2c_algo_pca_data *pca_data = adap->algo_data;
+
+ /* Ignore the reset function from the module,
+ * we can use the parallel bus reset
+ */
+ pca_data->reset_chip = pca9665_reset;
+
+ if (pca_data->i2c_clock > 1265800) {
+ printk(KERN_WARNING "%s: I2C clock speed too high."
+ " Using 1265.8kHz.\n", adap->name);
+ pca_data->i2c_clock = 1265800;
+ }
+
+ if (pca_data->i2c_clock < 60300) {
+ printk(KERN_WARNING "%s: I2C clock speed too low."
+ " Using 60.3kHz.\n", adap->name);
+ pca_data->i2c_clock = 60300;
+ }
+
+ /* To avoid integer overflow, use clock/100 for calculations */
+ clock = pca_clock(pca_data) / 100;
+
+ if (pca_data->i2c_clock > 10000) {
+ mode = I2C_PCA_MODE_TURBO;
+ min_tlow = 14;
+ min_thi = 5;
+ raise_fall_time = 22; /* Raise 11e-8s, Fall 11e-8s */
+ } else if (pca_data->i2c_clock > 4000) {
+ mode = I2C_PCA_MODE_FASTP;
+ min_tlow = 17;
+ min_thi = 9;
+ raise_fall_time = 22; /* Raise 11e-8s, Fall 11e-8s */
+ } else if (pca_data->i2c_clock > 1000) {
+ mode = I2C_PCA_MODE_FAST;
+ min_tlow = 44;
+ min_thi = 20;
+ raise_fall_time = 58; /* Raise 29e-8s, Fall 29e-8s */
+ } else {
+ mode = I2C_PCA_MODE_STD;
+ min_tlow = 157;
+ min_thi = 134;
+ raise_fall_time = 127; /* Raise 29e-8s, Fall 98e-8s */
+ }
+
+ /* The minimum clock that respects the thi/tlow = 134/157 is
+ * 64800 Hz. Below that, we have to fix the tlow to 255 and
+ * calculate the thi factor.
+ */
+ if (clock < 648) {
+ tlow = 255;
+ thi = 1000000 - clock * raise_fall_time;
+ thi /= (I2C_PCA_OSC_PER * clock) - tlow;
+ } else {
+ tlow = (1000000 - clock * raise_fall_time) * min_tlow;
+ tlow /= I2C_PCA_OSC_PER * clock * (min_thi + min_tlow);
+ thi = tlow * min_thi / min_tlow;
+ }
+
+ pca_reset(pca_data);
- clock = pca_clock(pca_data);
- printk(KERN_INFO "%s: Clock frequency is %dkHz\n", adap->name,
- freqs[clock]);
+ printk(KERN_INFO
+ "%s: Clock frequency is %dHz\n", adap->name, clock * 100);
- pca_set_con(pca_data, I2C_PCA_CON_ENSIO | clock);
+ pca_outw(pca_data, I2C_PCA_INDPTR, I2C_PCA_IMODE);
+ pca_outw(pca_data, I2C_PCA_IND, mode);
+ pca_outw(pca_data, I2C_PCA_INDPTR, I2C_PCA_ISCLL);
+ pca_outw(pca_data, I2C_PCA_IND, tlow);
+ pca_outw(pca_data, I2C_PCA_INDPTR, I2C_PCA_ISCLH);
+ pca_outw(pca_data, I2C_PCA_IND, thi);
+
+ pca_set_con(pca_data, I2C_PCA_CON_ENSIO);
+ }
udelay(500); /* 500 us for oscilator to stabilise */
return 0;
@@ -388,7 +540,7 @@ EXPORT_SYMBOL(i2c_pca_add_numbered_bus);
MODULE_AUTHOR("Ian Campbell <icampbell@arcom.com>, "
"Wolfram Sang <w.sang@pengutronix.de>");
-MODULE_DESCRIPTION("I2C-Bus PCA9564 algorithm");
+MODULE_DESCRIPTION("I2C-Bus PCA9564/PCA9665 algorithm");
MODULE_LICENSE("GPL");
module_param(i2c_debug, int, 0);
diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
index 7f95905bbb9d..68650643d116 100644
--- a/drivers/i2c/busses/Kconfig
+++ b/drivers/i2c/busses/Kconfig
@@ -617,12 +617,12 @@ config I2C_ELEKTOR
will be called i2c-elektor.
config I2C_PCA_ISA
- tristate "PCA9564 on an ISA bus"
+ tristate "PCA9564/PCA9665 on an ISA bus"
depends on ISA
select I2C_ALGOPCA
default n
help
- This driver supports ISA boards using the Philips PCA9564
+ This driver supports ISA boards using the Philips PCA9564/PCA9665
parallel bus to I2C bus controller.
This driver can also be built as a module. If so, the module
@@ -634,11 +634,11 @@ config I2C_PCA_ISA
time). If unsure, say N.
config I2C_PCA_PLATFORM
- tristate "PCA9564 as platform device"
+ tristate "PCA9564/PCA9665 as platform device"
select I2C_ALGOPCA
default n
help
- This driver supports a memory mapped Philips PCA9564
+ This driver supports a memory mapped Philips PCA9564/PCA9665
parallel bus to I2C bus controller.
This driver can also be built as a module. If so, the module
diff --git a/drivers/i2c/busses/i2c-pca-isa.c b/drivers/i2c/busses/i2c-pca-isa.c
index c420a7c0f3e4..0cc8017b3f64 100644
--- a/drivers/i2c/busses/i2c-pca-isa.c
+++ b/drivers/i2c/busses/i2c-pca-isa.c
@@ -41,7 +41,7 @@ static int irq = -1;
/* Data sheet recommends 59kHz for 100kHz operation due to variation
* in the actual clock rate */
-static int clock = I2C_PCA_CON_59kHz;
+static int clock = 59000;
static wait_queue_head_t pca_wait;
@@ -103,7 +103,7 @@ static struct i2c_algo_pca_data pca_isa_data = {
static struct i2c_adapter pca_isa_ops = {
.owner = THIS_MODULE,
.algo_data = &pca_isa_data,
- .name = "PCA9564 ISA Adapter",
+ .name = "PCA9564/PCA9665 ISA Adapter",
.timeout = 100,
};
@@ -196,7 +196,7 @@ static void __exit pca_isa_exit(void)
}
MODULE_AUTHOR("Ian Campbell <icampbell@arcom.com>");
-MODULE_DESCRIPTION("ISA base PCA9564 driver");
+MODULE_DESCRIPTION("ISA base PCA9564/PCA9665 driver");
MODULE_LICENSE("GPL");
module_param(base, ulong, 0);
@@ -205,7 +205,13 @@ MODULE_PARM_DESC(base, "I/O base address");
module_param(irq, int, 0);
MODULE_PARM_DESC(irq, "IRQ");
module_param(clock, int, 0);
-MODULE_PARM_DESC(clock, "Clock rate as described in table 1 of PCA9564 datasheet");
+MODULE_PARM_DESC(clock, "Clock rate in hertz.\n\t\t"
+ "For PCA9564: 330000,288000,217000,146000,"
+ "88000,59000,44000,36000\n"
+ "\t\tFor PCA9665:\tStandard: 60300 - 100099\n"
+ "\t\t\t\tFast: 100100 - 400099\n"
+ "\t\t\t\tFast+: 400100 - 10000099\n"
+ "\t\t\t\tTurbo: Up to 1265800");
module_init(pca_isa_init);
module_exit(pca_isa_exit);
diff --git a/drivers/i2c/busses/i2c-pca-platform.c b/drivers/i2c/busses/i2c-pca-platform.c
index 6bb15ad0a6b6..51d179bbddf9 100644
--- a/drivers/i2c/busses/i2c-pca-platform.c
+++ b/drivers/i2c/busses/i2c-pca-platform.c
@@ -172,8 +172,9 @@ static int __devinit i2c_pca_pf_probe(struct platform_device *pdev)
i2c->adap.nr = pdev->id >= 0 ? pdev->id : 0;
i2c->adap.owner = THIS_MODULE;
- snprintf(i2c->adap.name, sizeof(i2c->adap.name), "PCA9564 at 0x%08lx",
- (unsigned long) res->start);
+ snprintf(i2c->adap.name, sizeof(i2c->adap.name),
+ "PCA9564/PCA9665 at 0x%08lx",
+ (unsigned long) res->start);
i2c->adap.algo_data = &i2c->algo_data;
i2c->adap.dev.parent = &pdev->dev;
i2c->adap.timeout = platform_data->timeout;
@@ -246,7 +247,7 @@ e_remap:
e_alloc:
release_mem_region(res->start, res_len(res));
e_print:
- printk(KERN_ERR "Registering PCA9564 FAILED! (%d)\n", ret);
+ printk(KERN_ERR "Registering PCA9564/PCA9665 FAILED! (%d)\n", ret);
return ret;
}
@@ -290,7 +291,7 @@ static void __exit i2c_pca_pf_exit(void)
}
MODULE_AUTHOR("Wolfram Sang <w.sang@pengutronix.de>");
-MODULE_DESCRIPTION("I2C-PCA9564 platform driver");
+MODULE_DESCRIPTION("I2C-PCA9564/PCA9665 platform driver");
MODULE_LICENSE("GPL");
module_init(i2c_pca_pf_init);
diff --git a/include/linux/i2c-algo-pca.h b/include/linux/i2c-algo-pca.h
index adcb3dc7ac26..1364d62e2fbe 100644
--- a/include/linux/i2c-algo-pca.h
+++ b/include/linux/i2c-algo-pca.h
@@ -1,7 +1,14 @@
#ifndef _LINUX_I2C_ALGO_PCA_H
#define _LINUX_I2C_ALGO_PCA_H
-/* Clock speeds for the bus */
+/* Chips known to the pca algo */
+#define I2C_PCA_CHIP_9564 0x00
+#define I2C_PCA_CHIP_9665 0x01
+
+/* Internal period for PCA9665 oscilator */
+#define I2C_PCA_OSC_PER 3 /* e10-8s */
+
+/* Clock speeds for the bus for PCA9564*/
#define I2C_PCA_CON_330kHz 0x00
#define I2C_PCA_CON_288kHz 0x01
#define I2C_PCA_CON_217kHz 0x02
@@ -18,6 +25,26 @@
#define I2C_PCA_ADR 0x02 /* OWN ADR Read/Write */
#define I2C_PCA_CON 0x03 /* CONTROL Read/Write */
+/* PCA9665 registers */
+#define I2C_PCA_INDPTR 0x00 /* INDIRECT Pointer Write Only */
+#define I2C_PCA_IND 0x02 /* INDIRECT Read/Write */
+
+/* PCA9665 indirect registers */
+#define I2C_PCA_ICOUNT 0x00 /* Byte Count for buffered mode */
+#define I2C_PCA_IADR 0x01 /* OWN ADR */
+#define I2C_PCA_ISCLL 0x02 /* SCL LOW period */
+#define I2C_PCA_ISCLH 0x03 /* SCL HIGH period */
+#define I2C_PCA_ITO 0x04 /* TIMEOUT */
+#define I2C_PCA_IPRESET 0x05 /* Parallel bus reset */
+#define I2C_PCA_IMODE 0x06 /* I2C Bus mode */
+
+/* PCA9665 I2C bus mode */
+#define I2C_PCA_MODE_STD 0x00 /* Standard mode */
+#define I2C_PCA_MODE_FAST 0x01 /* Fast mode */
+#define I2C_PCA_MODE_FASTP 0x02 /* Fast Plus mode */
+#define I2C_PCA_MODE_TURBO 0x03 /* Turbo mode */
+
+
#define I2C_PCA_CON_AA 0x80 /* Assert Acknowledge */
#define I2C_PCA_CON_ENSIO 0x40 /* Enable */
#define I2C_PCA_CON_STA 0x20 /* Start */
@@ -31,7 +58,9 @@ struct i2c_algo_pca_data {
int (*read_byte) (void *data, int reg);
int (*wait_for_completion) (void *data);
void (*reset_chip) (void *data);
- /* i2c_clock values are defined in linux/i2c-algo-pca.h */
+ /* For PCA9564, use one of the predefined frequencies:
+ * 330000, 288000, 217000, 146000, 88000, 59000, 44000, 36000
+ * For PCA9665, use the frequency you want here. */
unsigned int i2c_clock;
};
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-22 00:18:33 +0000