[U-Boot] [PATCH] ppc4xx: Cleanup PPC4xx I2C infrastructure
Stefan Roese
sr at denx.de
Thu Nov 19 14:08:15 CET 2009
This patch cleans up the PPC4xx I2C intrastructure:
- Use C struct to describe the I2C registers instead of defines
- Coding style cleanup (braces, whitespace, comments, line length)
- Extract common code from i2c_read() and i2c_write()
- Remove unneeded IIC defines from ppc405.h & ppc440.h
Signed-off-by: Stefan Roese <sr at denx.de>
---
cpu/ppc4xx/i2c.c | 199 ++++++++++++++++++++++++++---------------------------
include/4xx_i2c.h | 38 ++++++-----
include/ppc405.h | 19 -----
include/ppc440.h | 19 -----
4 files changed, 118 insertions(+), 157 deletions(-)
diff --git a/cpu/ppc4xx/i2c.c b/cpu/ppc4xx/i2c.c
index e3e1bab..7976e75 100644
--- a/cpu/ppc4xx/i2c.c
+++ b/cpu/ppc4xx/i2c.c
@@ -1,5 +1,5 @@
/*
- * (C) Copyright 2007
+ * (C) Copyright 2007-2009
* Stefan Roese, DENX Software Engineering, sr at denx.de.
*
* based on work by Anne Sophie Harnois <anne-sophie.harnois at nextream.fr>
@@ -37,7 +37,8 @@
DECLARE_GLOBAL_DATA_PTR;
#if defined(CONFIG_I2C_MULTI_BUS)
-/* Initialize the bus pointer to whatever one the SPD EEPROM is on.
+/*
+ * Initialize the bus pointer to whatever one the SPD EEPROM is on.
* Default is bus 0. This is necessary because the DDR initialization
* runs from ROM, and we can't switch buses because we can't modify
* the global variables.
@@ -45,59 +46,63 @@ DECLARE_GLOBAL_DATA_PTR;
#ifndef CONFIG_SYS_SPD_BUS_NUM
#define CONFIG_SYS_SPD_BUS_NUM 0
#endif
-static unsigned int i2c_bus_num __attribute__ ((section (".data"))) = CONFIG_SYS_SPD_BUS_NUM;
+static unsigned int i2c_bus_num __attribute__ ((section (".data"))) =
+ CONFIG_SYS_SPD_BUS_NUM;
#endif /* CONFIG_I2C_MULTI_BUS */
static void _i2c_bus_reset(void)
{
+ struct ppc4xx_i2c *i2c = (struct ppc4xx_i2c *)I2C_BASE_ADDR;
int i;
u8 dc;
/* Reset status register */
/* write 1 in SCMP and IRQA to clear these fields */
- out_8((u8 *)IIC_STS, 0x0A);
+ out_8(&i2c->sts, 0x0A);
/* write 1 in IRQP IRQD LA ICT XFRA to clear these fields */
- out_8((u8 *)IIC_EXTSTS, 0x8F);
+ out_8(&i2c->extsts, 0x8F);
/* Place chip in the reset state */
- out_8((u8 *)IIC_XTCNTLSS, IIC_XTCNTLSS_SRST);
+ out_8(&i2c->xtcntlss, IIC_XTCNTLSS_SRST);
/* Check if bus is free */
- dc = in_8((u8 *)IIC_DIRECTCNTL);
+ dc = in_8(&i2c->directcntl);
if (!DIRCTNL_FREE(dc)){
/* Try to set bus free state */
- out_8((u8 *)IIC_DIRECTCNTL, IIC_DIRCNTL_SDAC | IIC_DIRCNTL_SCC);
+ out_8(&i2c->directcntl, IIC_DIRCNTL_SDAC | IIC_DIRCNTL_SCC);
/* Wait until we regain bus control */
for (i = 0; i < 100; ++i) {
- dc = in_8((u8 *)IIC_DIRECTCNTL);
+ dc = in_8(&i2c->directcntl);
if (DIRCTNL_FREE(dc))
break;
/* Toggle SCL line */
dc ^= IIC_DIRCNTL_SCC;
- out_8((u8 *)IIC_DIRECTCNTL, dc);
+ out_8(&i2c->directcntl, dc);
udelay(10);
dc ^= IIC_DIRCNTL_SCC;
- out_8((u8 *)IIC_DIRECTCNTL, dc);
+ out_8(&i2c->directcntl, dc);
}
}
/* Remove reset */
- out_8((u8 *)IIC_XTCNTLSS, 0);
+ out_8(&i2c->xtcntlss, 0);
}
-void i2c_init(int speed, int slaveadd)
+void i2c_init(int speed, int slaveaddr)
{
- unsigned long freqOPB;
+ struct ppc4xx_i2c *i2c = (struct ppc4xx_i2c *)I2C_BASE_ADDR;
int val, divisor;
int bus;
#ifdef CONFIG_SYS_I2C_INIT_BOARD
- /* call board specific i2c bus reset routine before accessing the */
- /* environment, which might be in a chip on that bus. For details */
- /* about this problem see doc/I2C_Edge_Conditions. */
+ /*
+ * Call board specific i2c bus reset routine before accessing the
+ * environment, which might be in a chip on that bus. For details
+ * about this problem see doc/I2C_Edge_Conditions.
+ */
i2c_init_board();
#endif
@@ -109,54 +114,52 @@ void i2c_init(int speed, int slaveadd)
_i2c_bus_reset();
/* clear lo master address */
- out_8((u8 *)IIC_LMADR, 0);
+ out_8(&i2c->lmadr, 0);
/* clear hi master address */
- out_8((u8 *)IIC_HMADR, 0);
+ out_8(&i2c->hmadr, 0);
/* clear lo slave address */
- out_8((u8 *)IIC_LSADR, 0);
+ out_8(&i2c->lsadr, 0);
/* clear hi slave address */
- out_8((u8 *)IIC_HSADR, 0);
+ out_8(&i2c->hsadr, 0);
/* Clock divide Register */
- /* get OPB frequency */
- freqOPB = get_OPB_freq();
- /* set divisor according to freqOPB */
- divisor = (freqOPB - 1) / 10000000;
+ /* set divisor according to freq_opb */
+ divisor = (get_OPB_freq() - 1) / 10000000;
if (divisor == 0)
divisor = 1;
- out_8((u8 *)IIC_CLKDIV, divisor);
+ out_8(&i2c->clkdiv, divisor);
/* no interrupts */
- out_8((u8 *)IIC_INTRMSK, 0);
+ out_8(&i2c->intrmsk, 0);
/* clear transfer count */
- out_8((u8 *)IIC_XFRCNT, 0);
+ out_8(&i2c->xfrcnt, 0);
/* clear extended control & stat */
/* write 1 in SRC SRS SWC SWS to clear these fields */
- out_8((u8 *)IIC_XTCNTLSS, 0xF0);
+ out_8(&i2c->xtcntlss, 0xF0);
/* Mode Control Register
Flush Slave/Master data buffer */
- out_8((u8 *)IIC_MDCNTL, IIC_MDCNTL_FSDB | IIC_MDCNTL_FMDB);
+ out_8(&i2c->mdcntl, IIC_MDCNTL_FSDB | IIC_MDCNTL_FMDB);
- val = in_8((u8 *)IIC_MDCNTL);
+ val = in_8(&i2c->mdcntl);
/* Ignore General Call, slave transfers are ignored,
* disable interrupts, exit unknown bus state, enable hold
* SCL 100kHz normaly or FastMode for 400kHz and above
*/
- val |= IIC_MDCNTL_EUBS|IIC_MDCNTL_HSCL;
+ val |= IIC_MDCNTL_EUBS | IIC_MDCNTL_HSCL;
if (speed >= 400000)
val |= IIC_MDCNTL_FSM;
- out_8((u8 *)IIC_MDCNTL, val);
+ out_8(&i2c->mdcntl, val);
/* clear control reg */
- out_8((u8 *)IIC_CNTL, 0x00);
+ out_8(&i2c->cntl, 0x00);
}
/* set to SPD bus as default bus upon powerup */
@@ -195,13 +198,14 @@ static int i2c_transfer(unsigned char cmd_type,
unsigned char data[],
unsigned short data_len)
{
- unsigned char* ptr;
+ struct ppc4xx_i2c *i2c = (struct ppc4xx_i2c *)I2C_BASE_ADDR;
+ u8 *ptr;
int reading;
- int tran,cnt;
+ int tran, cnt;
int result;
int status;
int i;
- uchar creg;
+ u8 creg;
if (data == 0 || data_len == 0) {
/* Don't support data transfer of no length or to address 0 */
@@ -219,12 +223,13 @@ static int i2c_transfer(unsigned char cmd_type,
}
/* Clear Stop Complete Bit */
- out_8((u8 *)IIC_STS, IIC_STS_SCMP);
+ out_8(&i2c->sts, IIC_STS_SCMP);
+
/* Check init */
i = 10;
do {
/* Get status */
- status = in_8((u8 *)IIC_STS);
+ status = in_8(&i2c->sts);
i--;
} while ((status & IIC_STS_PT) && (i > 0));
@@ -232,13 +237,16 @@ static int i2c_transfer(unsigned char cmd_type,
result = IIC_NOK_TOUT;
return(result);
}
+
/* flush the Master/Slave Databuffers */
- out_8((u8 *)IIC_MDCNTL, ((in_8((u8 *)IIC_MDCNTL))|IIC_MDCNTL_FMDB|IIC_MDCNTL_FSDB));
+ out_8(&i2c->mdcntl, in_8(&i2c->mdcntl) |
+ IIC_MDCNTL_FMDB | IIC_MDCNTL_FSDB);
+
/* need to wait 4 OPB clocks? code below should take that long */
/* 7-bit adressing */
- out_8((u8 *)IIC_HMADR, 0);
- out_8((u8 *)IIC_LMADR, chip);
+ out_8(&i2c->hmadr, 0);
+ out_8(&i2c->lmadr, chip);
tran = 0;
result = IIC_OK;
@@ -247,9 +255,10 @@ static int i2c_transfer(unsigned char cmd_type,
while (tran != cnt && (result == IIC_OK)) {
int bc,j;
- /* Control register =
- * Normal transfer, 7-bits adressing, Transfer up to bc bytes, Normal start,
- * Transfer is a sequence of transfers
+ /*
+ * Control register =
+ * Normal transfer, 7-bits adressing, Transfer up to
+ * bc bytes, Normal start, Transfer is a sequence of transfers
*/
creg |= IIC_CNTL_PT;
@@ -259,32 +268,36 @@ static int i2c_transfer(unsigned char cmd_type,
if ((!cmd_type && (ptr == addr)) || ((tran + bc) != cnt))
creg |= IIC_CNTL_CHT;
- if (reading)
+ if (reading) {
creg |= IIC_CNTL_READ;
- else
- for(j=0; j < bc; j++)
+ } else {
+ for(j = 0; j < bc; j++) {
/* Set buffer */
- out_8((u8 *)IIC_MDBUF, ptr[tran+j]);
- out_8((u8 *)IIC_CNTL, creg);
+ out_8(&i2c->mdbuf, ptr[tran + j]);
+ }
+ }
+ out_8(&i2c->cntl, creg);
- /* Transfer is in progress
+ /*
+ * Transfer is in progress
* we have to wait for upto 5 bytes of data
* 1 byte chip address+r/w bit then bc bytes
* of data.
* udelay(10) is 1 bit time at 100khz
* Doubled for slop. 20 is too small.
*/
- i = 2*5*8;
+ i = 2 * 5 * 8;
do {
/* Get status */
- status = in_8((u8 *)IIC_STS);
+ status = in_8(&i2c->sts);
udelay(10);
i--;
- } while ((status & IIC_STS_PT) && !(status & IIC_STS_ERR) && (i > 0));
+ } while ((status & IIC_STS_PT) && !(status & IIC_STS_ERR) &&
+ (i > 0));
if (status & IIC_STS_ERR) {
result = IIC_NOK;
- status = in_8((u8 *)IIC_EXTSTS);
+ status = in_8(&i2c->extsts);
/* Lost arbitration? */
if (status & IIC_EXTSTS_LA)
result = IIC_NOK_LA;
@@ -297,19 +310,21 @@ static int i2c_transfer(unsigned char cmd_type,
} else if ( status & IIC_STS_PT) {
result = IIC_NOK_TOUT;
}
+
/* Command is reading => get buffer */
if ((reading) && (result == IIC_OK)) {
/* Are there data in buffer */
if (status & IIC_STS_MDBS) {
/*
- * even if we have data we have to wait 4OPB clocks
- * for it to hit the front of the FIFO, after that
- * we can just read. We should check XFCNT here and
- * if the FIFO is full there is no need to wait.
+ * even if we have data we have to wait 4OPB
+ * clocks for it to hit the front of the FIFO,
+ * after that we can just read. We should check
+ * XFCNT here and if the FIFO is full there is
+ * no need to wait.
*/
udelay(1);
- for (j=0; j<bc; j++)
- ptr[tran+j] = in_8((u8 *)IIC_MDBUF);
+ for (j = 0; j < bc; j++)
+ ptr[tran + j] = in_8(&i2c->mdbuf);
} else
result = IIC_NOK_DATA;
}
@@ -324,7 +339,7 @@ static int i2c_transfer(unsigned char cmd_type,
creg = IIC_CNTL_RPST;
}
}
- return (result);
+ return result;
}
int i2c_probe(uchar chip)
@@ -338,17 +353,17 @@ int i2c_probe(uchar chip)
* address was <ACK>ed (i.e. there was a chip at that address which
* drove the data line low).
*/
- return (i2c_transfer(1, chip << 1, 0,0, buf, 1) != 0);
+ return (i2c_transfer(1, chip << 1, 0, 0, buf, 1) != 0);
}
-
-int i2c_read(uchar chip, uint addr, int alen, uchar * buffer, int len)
+static int ppc4xx_i2c_transfer(uchar chip, uint addr, int alen, uchar *buffer,
+ int len, int read)
{
uchar xaddr[4];
int ret;
if (alen > 4) {
- printf ("I2C read: addr len %d not supported\n", alen);
+ printf("I2C: addr len %d not supported\n", alen);
return 1;
}
@@ -373,50 +388,30 @@ int i2c_read(uchar chip, uint addr, int alen, uchar * buffer, int len)
* hidden in the chip address.
*/
if (alen > 0)
- chip |= ((addr >> (alen * 8)) & CONFIG_SYS_I2C_EEPROM_ADDR_OVERFLOW);
+ chip |= ((addr >> (alen * 8)) &
+ CONFIG_SYS_I2C_EEPROM_ADDR_OVERFLOW);
#endif
- if ((ret = i2c_transfer(1, chip<<1, &xaddr[4-alen], alen, buffer, len)) != 0) {
- if (gd->have_console)
- printf( "I2c read: failed %d\n", ret);
+ if ((ret = i2c_transfer(read, chip << 1, &xaddr[4 - alen], alen,
+ buffer, len)) != 0) {
+ if (gd->have_console) {
+ printf("I2C %s: failed %d\n",
+ read ? "read" : "write", ret);
+ }
+
return 1;
}
+
return 0;
}
-int i2c_write(uchar chip, uint addr, int alen, uchar * buffer, int len)
+int i2c_read(uchar chip, uint addr, int alen, uchar * buffer, int len)
{
- uchar xaddr[4];
-
- if (alen > 4) {
- printf ("I2C write: addr len %d not supported\n", alen);
- return 1;
-
- }
-
- if (alen > 0) {
- xaddr[0] = (addr >> 24) & 0xFF;
- xaddr[1] = (addr >> 16) & 0xFF;
- xaddr[2] = (addr >> 8) & 0xFF;
- xaddr[3] = addr & 0xFF;
- }
-
-#ifdef CONFIG_SYS_I2C_EEPROM_ADDR_OVERFLOW
- /*
- * EEPROM chips that implement "address overflow" are ones
- * like Catalyst 24WC04/08/16 which has 9/10/11 bits of
- * address and the extra bits end up in the "chip address"
- * bit slots. This makes a 24WC08 (1Kbyte) chip look like
- * four 256 byte chips.
- *
- * Note that we consider the length of the address field to
- * still be one byte because the extra address bits are
- * hidden in the chip address.
- */
- if (alen > 0)
- chip |= ((addr >> (alen * 8)) & CONFIG_SYS_I2C_EEPROM_ADDR_OVERFLOW);
-#endif
+ return ppc4xx_i2c_transfer(chip, addr, alen, buffer, len, 1);
+}
- return (i2c_transfer(0, chip<<1, &xaddr[4-alen], alen, buffer, len ) != 0);
+int i2c_write(uchar chip, uint addr, int alen, uchar * buffer, int len)
+{
+ return ppc4xx_i2c_transfer(chip, addr, alen, buffer, len, 0);
}
#if defined(CONFIG_I2C_MULTI_BUS)
diff --git a/include/4xx_i2c.h b/include/4xx_i2c.h
index 070657f..0c6c926 100644
--- a/include/4xx_i2c.h
+++ b/include/4xx_i2c.h
@@ -1,5 +1,5 @@
/*
- * (C) Copyright 2007
+ * (C) Copyright 2007-2009
* Stefan Roese, DENX Software Engineering, sr at denx.de.
*
* See file CREDITS for list of people who contributed to this
@@ -52,22 +52,26 @@
#define I2C_BASE_ADDR (0xEF600500 + I2C_BUS_OFFS)
#endif
-#define I2C_REGISTERS_BASE_ADDRESS I2C_BASE_ADDR
-#define IIC_MDBUF (I2C_REGISTERS_BASE_ADDRESS+IICMDBUF)
-#define IIC_SDBUF (I2C_REGISTERS_BASE_ADDRESS+IICSDBUF)
-#define IIC_LMADR (I2C_REGISTERS_BASE_ADDRESS+IICLMADR)
-#define IIC_HMADR (I2C_REGISTERS_BASE_ADDRESS+IICHMADR)
-#define IIC_CNTL (I2C_REGISTERS_BASE_ADDRESS+IICCNTL)
-#define IIC_MDCNTL (I2C_REGISTERS_BASE_ADDRESS+IICMDCNTL)
-#define IIC_STS (I2C_REGISTERS_BASE_ADDRESS+IICSTS)
-#define IIC_EXTSTS (I2C_REGISTERS_BASE_ADDRESS+IICEXTSTS)
-#define IIC_LSADR (I2C_REGISTERS_BASE_ADDRESS+IICLSADR)
-#define IIC_HSADR (I2C_REGISTERS_BASE_ADDRESS+IICHSADR)
-#define IIC_CLKDIV (I2C_REGISTERS_BASE_ADDRESS+IIC0_CLKDIV)
-#define IIC_INTRMSK (I2C_REGISTERS_BASE_ADDRESS+IICINTRMSK)
-#define IIC_XFRCNT (I2C_REGISTERS_BASE_ADDRESS+IICXFRCNT)
-#define IIC_XTCNTLSS (I2C_REGISTERS_BASE_ADDRESS+IICXTCNTLSS)
-#define IIC_DIRECTCNTL (I2C_REGISTERS_BASE_ADDRESS+IICDIRECTCNTL)
+struct ppc4xx_i2c {
+ u8 mdbuf;
+ u8 res1;
+ u8 sdbuf;
+ u8 res2;
+ u8 lmadr;
+ u8 hmadr;
+ u8 cntl;
+ u8 mdcntl;
+ u8 sts;
+ u8 extsts;
+ u8 lsadr;
+ u8 hsadr;
+ u8 clkdiv;
+ u8 intrmsk;
+ u8 xfrcnt;
+ u8 xtcntlss;
+ u8 directcntl;
+ u8 intr;
+};
/* MDCNTL Register Bit definition */
#define IIC_MDCNTL_HSCL 0x01
diff --git a/include/ppc405.h b/include/ppc405.h
index 508c77b..bc2d051 100644
--- a/include/ppc405.h
+++ b/include/ppc405.h
@@ -566,25 +566,6 @@
#define MAL0_RCBS24 (MAL_DCR_BASE + 0x78) /* RX 24 Channel buffer size */
/*-----------------------------------------------------------------------------
-| IIC Register Offsets
-'----------------------------------------------------------------------------*/
-#define IICMDBUF 0x00
-#define IICSDBUF 0x02
-#define IICLMADR 0x04
-#define IICHMADR 0x05
-#define IICCNTL 0x06
-#define IICMDCNTL 0x07
-#define IICSTS 0x08
-#define IICEXTSTS 0x09
-#define IICLSADR 0x0A
-#define IICHSADR 0x0B
-#define IIC0_CLKDIV 0x0C
-#define IICINTRMSK 0x0D
-#define IICXFRCNT 0x0E
-#define IICXTCNTLSS 0x0F
-#define IICDIRECTCNTL 0x10
-
-/*-----------------------------------------------------------------------------
| UART Register Offsets
'----------------------------------------------------------------------------*/
#define DATA_REG 0x00
diff --git a/include/ppc440.h b/include/ppc440.h
index a050ffd..e60fa13 100644
--- a/include/ppc440.h
+++ b/include/ppc440.h
@@ -1714,25 +1714,6 @@
#endif
/*-----------------------------------------------------------------------------
-| IIC Register Offsets
-'----------------------------------------------------------------------------*/
-#define IICMDBUF 0x00
-#define IICSDBUF 0x02
-#define IICLMADR 0x04
-#define IICHMADR 0x05
-#define IICCNTL 0x06
-#define IICMDCNTL 0x07
-#define IICSTS 0x08
-#define IICEXTSTS 0x09
-#define IICLSADR 0x0A
-#define IICHSADR 0x0B
-#define IIC0_CLKDIV 0x0C
-#define IICINTRMSK 0x0D
-#define IICXFRCNT 0x0E
-#define IICXTCNTLSS 0x0F
-#define IICDIRECTCNTL 0x10
-
-/*-----------------------------------------------------------------------------
| PCI Internal Registers et. al. (accessed via plb)
+----------------------------------------------------------------------------*/
#define PCIL0_CFGADR (CONFIG_SYS_PCI_BASE + 0x0ec00000)
--
1.6.5.2
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