From: David Brownell <[EMAIL PROTECTED]>
Update DM6466 EVM to support the new MMC board config data.
This provides a miniature I2C driver in the board-dm644x-evm.c
file ... unusual, but it does make it easier to pass the key
information easily to the MMC driver.
There's no attempt to use the gpio_to_irq(GPIO(7)) signals that
are issued when the various card detect signals change, or when
the IR remote sends a command.
Signed-off-by: David Brownell <[EMAIL PROTECTED]>
---
A more complete solution would create a drivers/mfd/dm6446evm_msp.c
driver, like the dm355evm_msp.c driver. That would be an easy path
to getting the RTC functional again (newer firmware being more sane
than what was shipped before Rev E boards), getting clean access
to the CF control signals, and reporting the remote control buttons
through the input subsystem.
I'll suggest that someone else volunteer for that ... there's now a
decent model to follow. :)
arch/arm/mach-davinci/board-dm644x-evm.c | 97 ++++++++++++++++++++++++++++-
1 file changed, 95 insertions(+), 2 deletions(-)
--- a/arch/arm/mach-davinci/board-dm644x-evm.c
+++ b/arch/arm/mach-davinci/board-dm644x-evm.c
@@ -432,8 +432,101 @@ int dm6446evm_eeprom_write(void *buf, of
}
EXPORT_SYMBOL(dm6446evm_eeprom_write);
+/*
+ * MSP430 supports RTC, card detection, input from IR remote, and
+ * a bit more. It triggers interrupts on GPIO(7) from pressing
+ * buttons on the IR remote, and for card detect switches.
+ */
+static struct i2c_client *dm6446evm_msp;
+
+static int dm6446evm_msp_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ dm6446evm_msp = client;
+ return 0;
+}
+
+static int dm6446evm_msp_remove(struct i2c_client *client)
+{
+ dm6446evm_msp = NULL;
+ return 0;
+}
+
+static const struct i2c_device_id dm6446evm_msp_ids[] = {
+ { "dm6446evm_msp", 0, },
+ { /* end of list */ },
+};
+
+static struct i2c_driver dm6446evm_msp_driver = {
+ .driver.name = "dm6446evm_msp",
+ .id_table = dm6446evm_msp_ids,
+ .probe = dm6446evm_msp_probe,
+ .remove = dm6446evm_msp_remove,
+};
+
+static int dm6444evm_msp430_get_pins(void)
+{
+ static const char txbuf[2] = { 2, 4, };
+ char buf[4];
+ struct i2c_msg msg[2] = {
+ {
+ .addr = dm6446evm_msp->addr,
+ .flags = 0,
+ .len = 2,
+ .buf = (void __force *)txbuf,
+ },
+ {
+ .addr = dm6446evm_msp->addr,
+ .flags = I2C_M_RD,
+ .len = 4,
+ .buf = buf,
+ },
+ };
+ int status;
+
+ if (!dm6446evm_msp)
+ return -ENXIO;
+
+ /* Command 4 == get input state, returns port 2 and port3 data
+ * S Addr W [A] len=2 [A] cmd=4 [A]
+ * RS Addr R [A] [len=4] A [cmd=4] A [port2] A [port3] N P
+ */
+ status = i2c_transfer(dm6446evm_msp->adapter, msg, 2);
+ if (status < 0)
+ return status;
+
+ dev_dbg(&dm6446evm_msp->dev,
+ "PINS: %02x %02x %02x %02x\n",
+ buf[0], buf[1], buf[2], buf[3]);
+
+ return (buf[3] << 8) | buf[2];
+}
+
+static int dm6444evm_mmc_get_cd(int module)
+{
+ int status = dm6444evm_msp430_get_pins();
+
+ return (status < 0) ? status : !(status & BIT(1));
+}
+
+static int dm6444evm_mmc_get_ro(int module)
+{
+ int status = dm6444evm_msp430_get_pins();
+
+ return (status < 0) ? status : status & BIT(6 + 8);
+}
+
+static struct davinci_mmc_config dm6446evm_mmc_config = {
+ .get_cd = dm6444evm_mmc_get_cd,
+ .get_ro = dm6444evm_mmc_get_ro,
+ .wires = 4
+};
+
static struct i2c_board_info __initdata i2c_info[] = {
{
+ I2C_BOARD_INFO("dm6446evm_msp", 0x23),
+ },
+ {
I2C_BOARD_INFO("pcf8574", 0x38),
.platform_data = &pcf_data_u2,
},
@@ -451,7 +544,6 @@ static struct i2c_board_info __initdata
},
/* ALSO:
* - tvl320aic33 audio codec (0x1b)
- * - msp430 microcontroller (0x23)
* - tvp5146 video decoder (0x5d)
*/
};
@@ -467,6 +559,7 @@ static struct davinci_i2c_platform_data
static void __init evm_init_i2c(void)
{
davinci_init_i2c(&i2c_pdata);
+ i2c_add_driver(&dm6446evm_msp_driver);
i2c_register_board_info(1, i2c_info, ARRAY_SIZE(i2c_info));
}
@@ -509,7 +602,7 @@ static __init void davinci_evm_init(void
ARRAY_SIZE(davinci_evm_devices));
evm_init_i2c();
- davinci_setup_mmc(0, NULL);
+ davinci_setup_mmc(0, &dm6446evm_mmc_config);
davinci_board_config = davinci_evm_config;
davinci_board_config_size = ARRAY_SIZE(davinci_evm_config);
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