Another try.. now without redundant declarations.
Jordan
ALCHEMY: AU1200 I2C modifications
From: Jordan Crouse <jordan.crouse@xxxxxxx>
Modifications to the existing AU1XXX I2C controller for the Au1200.
Signed-off-by: Jordan Crouse <jordan.crouse@xxxxxxx>
---
arch/mips/au1000/db1x00/board_setup.c | 37 +++++++++++++++++++++++++++++
drivers/i2c/busses/Kconfig | 2 +-
drivers/i2c/busses/i2c-au1550.c | 22 ++++++++++++-----
include/asm-mips/mach-au1x00/au1xxx_psc.h | 2 +-
4 files changed, 54 insertions(+), 9 deletions(-)
diff --git a/arch/mips/au1000/db1x00/board_setup.c b/arch/mips/au1000/db1x00/board_setup.c
index f00ec3b..a2638c8 100644
--- a/arch/mips/au1000/db1x00/board_setup.c
+++ b/arch/mips/au1000/db1x00/board_setup.c
@@ -76,6 +76,43 @@ #if defined(CONFIG_IRDA) && (defined(CON
#endif
bcsr->pcmcia = 0x0000; /* turn off PCMCIA power */
+#if defined(CONFIG_I2C_AU1550) && defined(CONFIG_MIPS_DB1200)
+ {
+ u32 freq0, clksrc;
+
+ /* Select SMBUS in CPLD */
+ bcsr->resets &= ~(BCSR_RESETS_PCS0MUX);
+
+ pin_func = au_readl(SYS_PINFUNC);
+ au_sync();
+ pin_func &= ~(3<<17 | 1<<4);
+ /* Set GPIOs correctly */
+ pin_func |= 2<<17;
+ au_writel(pin_func, SYS_PINFUNC);
+ au_sync();
+
+ /* The i2c driver depends on 50Mhz clock */
+ freq0 = au_readl(SYS_FREQCTRL0);
+ au_sync();
+ freq0 &= ~(SYS_FC_FRDIV1_MASK | SYS_FC_FS1 | SYS_FC_FE1);
+ freq0 |= (3<<SYS_FC_FRDIV1_BIT);
+ /* 396Mhz / (3+1)*2 == 49.5Mhz */
+ au_writel(freq0, SYS_FREQCTRL0);
+ au_sync();
+ freq0 |= SYS_FC_FE1;
+ au_writel(freq0, SYS_FREQCTRL0);
+ au_sync();
+
+ clksrc = au_readl(SYS_CLKSRC);
+ au_sync();
+ clksrc &= ~0x01f00000;
+ /* bit 22 is EXTCLK0 for PSC0 */
+ clksrc |= (0x3 << 22);
+ au_writel(clksrc, SYS_CLKSRC);
+ au_sync();
+ }
+#endif
+
#ifdef CONFIG_MIPS_MIRAGE
/* enable GPIO[31:0] inputs */
au_writel(0, SYS_PININPUTEN);
diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
index d6d4494..e023563 100644
--- a/drivers/i2c/busses/Kconfig
+++ b/drivers/i2c/busses/Kconfig
@@ -76,7 +76,7 @@ config I2C_AMD8111
config I2C_AU1550
tristate "Au1550 SMBus interface"
- depends on I2C && SOC_AU1550
+ depends on I2C && (SOC_AU1550 || SOC_AU1200)
help
If you say yes to this option, support will be included for the
Au1550 SMBus interface.
diff --git a/drivers/i2c/busses/i2c-au1550.c b/drivers/i2c/busses/i2c-au1550.c
index d06edce..368fd96 100644
--- a/drivers/i2c/busses/i2c-au1550.c
+++ b/drivers/i2c/busses/i2c-au1550.c
@@ -34,8 +34,7 @@ #include <linux/init.h>
#include <linux/errno.h>
#include <linux/i2c.h>
-#include <asm/mach-au1x00/au1000.h>
-#include <asm/mach-pb1x00/pb1550.h>
+#include <asm/mach-au1x00/au1xxx.h>
#include <asm/mach-au1x00/au1xxx_psc.h>
#include "i2c-au1550.h"
@@ -118,13 +117,20 @@ do_address(struct i2c_au1550_data *adap,
/* Reset the FIFOs, clear events.
*/
- sp->psc_smbpcr = PSC_SMBPCR_DC;
+ stat = sp->psc_smbstat;
sp->psc_smbevnt = PSC_SMBEVNT_ALLCLR;
au_sync();
- do {
- stat = sp->psc_smbpcr;
+
+ if (!(stat & PSC_SMBSTAT_TE) || !(stat & PSC_SMBSTAT_RE))
+ {
+ sp->psc_smbpcr = PSC_SMBPCR_DC;
au_sync();
- } while ((stat & PSC_SMBPCR_DC) != 0);
+ do {
+ stat = sp->psc_smbpcr;
+ au_sync();
+ } while ((stat & PSC_SMBPCR_DC) != 0);
+ udelay(50);
+ }
/* Write out the i2c chip address and specify operation
*/
@@ -367,7 +373,7 @@ static struct i2c_au1550_data pb1550_i2c
SMBUS_PSC_BASE, 200, 200
};
-static struct i2c_adapter pb1550_board_adapter = {
+struct i2c_adapter pb1550_board_adapter = {
name: "pb1550 adapter",
id: I2C_HW_AU1550_PSC,
algo: NULL,
@@ -376,6 +382,8 @@ static struct i2c_adapter pb1550_board_a
client_unregister: pb1550_unreg,
};
+EXPORT_SYMBOL(pb1550_board_adapter);
+
/* BIG hack to support the control interface on the Wolfson WM8731
* audio codec on the Pb1550 board. We get an address and two data
* bytes to write, create an i2c message, and send it across the
diff --git a/include/asm-mips/mach-au1x00/au1xxx_psc.h b/include/asm-mips/mach-au1x00/au1xxx_psc.h
index faa5ffe..c097ac3 100644
--- a/include/asm-mips/mach-au1x00/au1xxx_psc.h
+++ b/include/asm-mips/mach-au1x00/au1xxx_psc.h
@@ -513,7 +513,7 @@ #define PSC_SMBEVNT_ALLCLR (PSC_SMBEVNT_
/* Transmit register control.
*/
-#define PSC_SMBTXRX_RSR (1 << 30)
+#define PSC_SMBTXRX_RSR (1 << 28)
#define PSC_SMBTXRX_STP (1 << 29)
#define PSC_SMBTXRX_DATAMASK (0xff)
