diff options
author | wdenk <wdenk> | 2004-09-28 21:26:26 (GMT) |
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committer | wdenk <wdenk> | 2004-09-28 21:26:26 (GMT) |
commit | c65fdc74aa2c8ce6f7e500bb5dbf95425270adb9 (patch) | |
tree | 5cf6329fcf37701c092a89399fba452b10eb86a3 /cpu | |
parent | 64f70bede37f833d2ed31311ff293c759c41a2a6 (diff) | |
download | u-boot-c65fdc74aa2c8ce6f7e500bb5dbf95425270adb9.tar.xz |
* Patch by Jon Loeliger, 15 Jul 2004:
Fix MPC85xx I2C driver
Diffstat (limited to 'cpu')
-rw-r--r-- | cpu/mpc85xx/i2c.c | 245 |
1 files changed, 111 insertions, 134 deletions
diff --git a/cpu/mpc85xx/i2c.c b/cpu/mpc85xx/i2c.c index ae08d18..2d08487 100644 --- a/cpu/mpc85xx/i2c.c +++ b/cpu/mpc85xx/i2c.c @@ -30,78 +30,57 @@ #include <common.h> #include <command.h> - -#define DEBUG - -#if defined(DEBUG) -#define DEB(x) x -#else -#define DEB(x) -#endif +#include <asm/io.h> #ifdef CONFIG_HARD_I2C #include <i2c.h> #define TIMEOUT (CFG_HZ/4) -#define I2C_Addr ((unsigned *)(CFG_CCSRBAR + 0x3000)) +#define I2C_Addr ((u8 *)(CFG_CCSRBAR + 0x3000)) #define I2CADR &I2C_Addr[0] -#define I2CFDR &I2C_Addr[1] -#define I2CCCR &I2C_Addr[2] -#define I2CCSR &I2C_Addr[3] -#define I2CCDR &I2C_Addr[4] -#define I2CDFSRR &I2C_Addr[5] +#define I2CFDR &I2C_Addr[4] +#define I2CCCR &I2C_Addr[8] +#define I2CCSR &I2C_Addr[12] +#define I2CCDR &I2C_Addr[16] +#define I2CDFSRR &I2C_Addr[20] #define I2C_READ 1 #define I2C_WRITE 0 -/* taken from linux include/asm-ppc/io.h */ -inline unsigned in_le32(volatile unsigned *addr) +void +i2c_init(int speed, int slaveadd) { - unsigned ret; + /* stop I2C controller */ + writeb(0x0, I2CCCR); - __asm__ __volatile__("lwbrx %0,0,%1;\n" - "twi 0,%0,0;\n" - "isync" : "=r" (ret) : - "r" (addr), "m" (*addr)); - return ret; -} + /* set clock */ + writeb(0x3f, I2CFDR); -inline void out_le32(volatile unsigned *addr, int val) -{ - __asm__ __volatile__("stwbrx %1,0,%2; eieio" : "=m" (*addr) : - "r" (val), "r" (addr)); -} + /* set default filter */ + writeb(0x10,I2CDFSRR); -#define writel(val, addr) out_le32(addr, val) -#define readl(addr) in_le32(addr) + /* write slave address */ + writeb(slaveadd, I2CADR); -void -i2c_init(int speed, int slaveadd) -{ - /* stop I2C controller */ - writel (0x0, I2CCCR); - /* set clock */ - writel (0x3f, I2CFDR); - /* set default filter */ - writel (0x10,I2CDFSRR); - /* write slave address */ - writel (slaveadd, I2CADR); - /* clear status register */ - writel (0x0, I2CCSR); - /* start I2C controller */ - writel (MPC85xx_I2CCR_MEN, I2CCCR); + /* clear status register */ + writeb(0x0, I2CCSR); + + /* start I2C controller */ + writeb(MPC85xx_I2CCR_MEN, I2CCCR); } static __inline__ int i2c_wait4bus (void) { - ulong timeval = get_timer (0); + ulong timeval = get_timer (0); - while (readl (I2CCSR) & MPC85xx_I2CSR_MBB) - if (get_timer (timeval) > TIMEOUT) - return -1; + while (readb(I2CCSR) & MPC85xx_I2CSR_MBB) { + if (get_timer (timeval) > TIMEOUT) { + return -1; + } + } return 0; } @@ -109,153 +88,151 @@ i2c_wait4bus (void) static __inline__ int i2c_wait (int write) { - u32 csr; - ulong timeval = get_timer (0); + u32 csr; + ulong timeval = get_timer (0); - do - { - csr = readl (I2CCSR); + do { + csr = readb(I2CCSR); - if (!(csr & MPC85xx_I2CSR_MIF)) - continue; + if (!(csr & MPC85xx_I2CSR_MIF)) + continue; - writel (0x0, I2CCSR); + writeb(0x0, I2CCSR); - if (csr & MPC85xx_I2CSR_MAL) - { - DEB(printf ("i2c_wait: MAL\n")); - return -1; - } + if (csr & MPC85xx_I2CSR_MAL) { + debug("i2c_wait: MAL\n"); + return -1; + } - if (!(csr & MPC85xx_I2CSR_MCF)) - { - DEB(printf ("i2c_wait: unfinished\n")); - return -1; - } + if (!(csr & MPC85xx_I2CSR_MCF)) { + debug("i2c_wait: unfinished\n"); + return -1; + } - if (write == I2C_WRITE && (csr & MPC85xx_I2CSR_RXAK)) - { - DEB(printf ("i2c_wait: No RXACK\n")); - return -1; - } + if (write == I2C_WRITE && (csr & MPC85xx_I2CSR_RXAK)) { + debug("i2c_wait: No RXACK\n"); + return -1; + } - return 0; - } while (get_timer (timeval) < TIMEOUT); + return 0; + } while (get_timer (timeval) < TIMEOUT); - DEB(printf ("i2c_wait: timed out\n")); - return -1; + debug("i2c_wait: timed out\n"); + return -1; } static __inline__ int i2c_write_addr (u8 dev, u8 dir, int rsta) { - writel (MPC85xx_I2CCR_MEN | MPC85xx_I2CCR_MSTA | MPC85xx_I2CCR_MTX | - (rsta?MPC85xx_I2CCR_RSTA:0), I2CCCR); + writeb(MPC85xx_I2CCR_MEN | MPC85xx_I2CCR_MSTA | MPC85xx_I2CCR_MTX | + (rsta?MPC85xx_I2CCR_RSTA:0), + I2CCCR); - writel ((dev << 1) | dir, I2CCDR); + writeb((dev << 1) | dir, I2CCDR); - if (i2c_wait (I2C_WRITE) < 0) - return 0; + if (i2c_wait (I2C_WRITE) < 0) + return 0; - return 1; + return 1; } static __inline__ int __i2c_write (u8 *data, int length) { - int i; + int i; - writel (MPC85xx_I2CCR_MEN | MPC85xx_I2CCR_MSTA | MPC85xx_I2CCR_MTX, I2CCCR); + writeb(MPC85xx_I2CCR_MEN | MPC85xx_I2CCR_MSTA | MPC85xx_I2CCR_MTX, + I2CCCR); - for (i=0; i < length; i++) - { - writel (data[i], I2CCDR); + for (i=0; i < length; i++) { + writeb(data[i], I2CCDR); - if (i2c_wait (I2C_WRITE) < 0) - break; - } + if (i2c_wait (I2C_WRITE) < 0) + break; + } - return i; + return i; } static __inline__ int __i2c_read (u8 *data, int length) { - int i; + int i; - writel (MPC85xx_I2CCR_MEN | MPC85xx_I2CCR_MSTA | - ((length == 1) ? MPC85xx_I2CCR_TXAK : 0), I2CCCR); + writeb(MPC85xx_I2CCR_MEN | MPC85xx_I2CCR_MSTA | + ((length == 1) ? MPC85xx_I2CCR_TXAK : 0), + I2CCCR); - /* dummy read */ - readl (I2CCDR); + /* dummy read */ + readb(I2CCDR); - for (i=0; i < length; i++) - { - if (i2c_wait (I2C_READ) < 0) - break; + for (i=0; i < length; i++) { + if (i2c_wait (I2C_READ) < 0) + break; - /* Generate ack on last next to last byte */ - if (i == length - 2) - writel (MPC85xx_I2CCR_MEN | MPC85xx_I2CCR_MSTA | - MPC85xx_I2CCR_TXAK, I2CCCR); + /* Generate ack on last next to last byte */ + if (i == length - 2) + writeb(MPC85xx_I2CCR_MEN | MPC85xx_I2CCR_MSTA | + MPC85xx_I2CCR_TXAK, + I2CCCR); - /* Generate stop on last byte */ - if (i == length - 1) - writel (MPC85xx_I2CCR_MEN | MPC85xx_I2CCR_TXAK, I2CCCR); + /* Generate stop on last byte */ + if (i == length - 1) + writeb(MPC85xx_I2CCR_MEN | MPC85xx_I2CCR_TXAK, I2CCCR); - data[i] = readl (I2CCDR); - } + data[i] = readb(I2CCDR); + } - return i; + return i; } int i2c_read (u8 dev, uint addr, int alen, u8 *data, int length) { - int i = 0; - u8 *a = (u8*)&addr; + int i = 0; + u8 *a = (u8*)&addr; - if (i2c_wait4bus () < 0) - goto exit; + if (i2c_wait4bus () < 0) + goto exit; - if (i2c_write_addr (dev, I2C_WRITE, 0) == 0) - goto exit; + if (i2c_write_addr (dev, I2C_WRITE, 0) == 0) + goto exit; - if (__i2c_write (&a[4 - alen], alen) != alen) - goto exit; + if (__i2c_write (&a[4 - alen], alen) != alen) + goto exit; - if (i2c_write_addr (dev, I2C_READ, 1) == 0) - goto exit; + if (i2c_write_addr (dev, I2C_READ, 1) == 0) + goto exit; - i = __i2c_read (data, length); + i = __i2c_read (data, length); exit: - writel (MPC85xx_I2CCR_MEN, I2CCCR); + writeb(MPC85xx_I2CCR_MEN, I2CCCR); - return !(i == length); + return !(i == length); } int i2c_write (u8 dev, uint addr, int alen, u8 *data, int length) { - int i = 0; - u8 *a = (u8*)&addr; + int i = 0; + u8 *a = (u8*)&addr; - if (i2c_wait4bus () < 0) - goto exit; + if (i2c_wait4bus () < 0) + goto exit; - if (i2c_write_addr (dev, I2C_WRITE, 0) == 0) - goto exit; + if (i2c_write_addr (dev, I2C_WRITE, 0) == 0) + goto exit; - if (__i2c_write (&a[4 - alen], alen) != alen) - goto exit; + if (__i2c_write (&a[4 - alen], alen) != alen) + goto exit; - i = __i2c_write (data, length); + i = __i2c_write (data, length); exit: - writel (MPC85xx_I2CCR_MEN, I2CCCR); + writeb(MPC85xx_I2CCR_MEN, I2CCCR); - return !(i == length); + return !(i == length); } int i2c_probe (uchar chip) |