diff options
Diffstat (limited to 'arch/ppc/boot/simple/iic.c')
| -rw-r--r-- | arch/ppc/boot/simple/iic.c | 214 |
1 files changed, 0 insertions, 214 deletions
diff --git a/arch/ppc/boot/simple/iic.c b/arch/ppc/boot/simple/iic.c deleted file mode 100644 index 5e91489..0000000 --- a/arch/ppc/boot/simple/iic.c +++ /dev/null @@ -1,214 +0,0 @@ -/* Minimal support functions to read configuration from IIC EEPROMS - * on MPC8xx boards. Originally written for RPGC RPX-Lite. - * Dan Malek (dmalek@jlc.net). - */ -#include <linux/types.h> -#include <asm/uaccess.h> -#include <asm/mpc8xx.h> -#include <asm/cpm1.h> - - -/* IIC functions. - * These are just the basic master read/write operations so we can - * examine serial EEPROM. - */ -void iic_read(uint devaddr, u_char *buf, uint offset, uint count); - -static int iic_init_done; - -static void -iic_init(void) -{ - volatile iic_t *iip; - volatile i2c8xx_t *i2c; - volatile cpm8xx_t *cp; - volatile immap_t *immap; - uint dpaddr; - - immap = (immap_t *)IMAP_ADDR; - cp = (cpm8xx_t *)&(immap->im_cpm); - - /* Reset the CPM. This is necessary on the 860 processors - * that may have started the SCC1 ethernet without relocating - * the IIC. - * This also stops the Ethernet in case we were loaded by a - * BOOTP rom monitor. - */ - cp->cp_cpcr = (CPM_CR_RST | CPM_CR_FLG); - - /* Wait for it. - */ - while (cp->cp_cpcr & (CPM_CR_RST | CPM_CR_FLG)); - - /* Remove any microcode patches. We will install our own - * later. - */ - cp->cp_cpmcr1 = 0; - cp->cp_cpmcr2 = 0; - cp->cp_cpmcr3 = 0; - cp->cp_cpmcr4 = 0; - cp->cp_rccr = 0; - - iip = (iic_t *)&cp->cp_dparam[PROFF_IIC]; - i2c = (i2c8xx_t *)&(immap->im_i2c); - - /* Initialize Port B IIC pins. - */ - cp->cp_pbpar |= 0x00000030; - cp->cp_pbdir |= 0x00000030; - cp->cp_pbodr |= 0x00000030; - - /* Initialize the parameter ram. - */ - - /* Allocate space for a two transmit and one receive buffer - * descriptor in the DP ram. - * For now, this address seems OK, but it may have to - * change with newer versions of the firmware. - */ - dpaddr = 0x0840; - - /* Set up the IIC parameters in the parameter ram. - */ - iip->iic_tbase = dpaddr; - iip->iic_rbase = dpaddr + (2 * sizeof(cbd_t)); - - iip->iic_tfcr = SMC_EB; - iip->iic_rfcr = SMC_EB; - - /* This should really be done by the reader/writer. - */ - iip->iic_mrblr = 128; - - /* Initialize Tx/Rx parameters. - */ - cp->cp_cpcr = mk_cr_cmd(CPM_CR_CH_I2C, CPM_CR_INIT_TRX) | CPM_CR_FLG; - while (cp->cp_cpcr & CPM_CR_FLG); - - /* Select an arbitrary address. Just make sure it is unique. - */ - i2c->i2c_i2add = 0x34; - - /* Make clock run maximum slow. - */ - i2c->i2c_i2brg = 7; - - /* Disable interrupts. - */ - i2c->i2c_i2cmr = 0; - i2c->i2c_i2cer = 0xff; - - /* Enable SDMA. - */ - immap->im_siu_conf.sc_sdcr = 1; - - iic_init_done = 1; -} - -/* Read from IIC. - * Caller provides device address, memory buffer, and byte count. - */ -static u_char iitemp[32]; - -void -iic_read(uint devaddr, u_char *buf, uint offset, uint count) -{ - volatile iic_t *iip; - volatile i2c8xx_t *i2c; - volatile cbd_t *tbdf, *rbdf; - volatile cpm8xx_t *cp; - volatile immap_t *immap; - u_char *tb; - uint temp; - - /* If the interface has not been initialized, do that now. - */ - if (!iic_init_done) - iic_init(); - - immap = (immap_t *)IMAP_ADDR; - cp = (cpm8xx_t *)&(immap->im_cpm); - - iip = (iic_t *)&cp->cp_dparam[PROFF_IIC]; - i2c = (i2c8xx_t *)&(immap->im_i2c); - - tbdf = (cbd_t *)&cp->cp_dpmem[iip->iic_tbase]; - rbdf = (cbd_t *)&cp->cp_dpmem[iip->iic_rbase]; - - /* Send a "dummy write" operation. This is a write request with - * only the offset sent, followed by another start condition. - * This will ensure we start reading from the first location - * of the EEPROM. - */ - tb = iitemp; - tb = (u_char *)(((uint)tb + 15) & ~15); - tbdf->cbd_bufaddr = (int)tb; - *tb = devaddr & 0xfe; /* Device address */ - *(tb+1) = offset; /* Offset */ - tbdf->cbd_datlen = 2; /* Length */ - tbdf->cbd_sc = - BD_SC_READY | BD_SC_LAST | BD_SC_WRAP | BD_IIC_START; - - i2c->i2c_i2mod = 1; /* Enable */ - i2c->i2c_i2cer = 0xff; - i2c->i2c_i2com = 0x81; /* Start master */ - - /* Wait for IIC transfer. - */ -#if 0 - while ((i2c->i2c_i2cer & 3) == 0); - - if (tbdf->cbd_sc & BD_SC_READY) - printf("IIC ra complete but tbuf ready\n"); -#else - temp = 10000000; - while ((tbdf->cbd_sc & BD_SC_READY) && (temp != 0)) - temp--; -#if 0 - /* We can't do this...there is no serial port yet! - */ - if (temp == 0) { - printf("Timeout reading EEPROM\n"); - return; - } -#endif -#endif - - /* Chip errata, clear enable. - */ - i2c->i2c_i2mod = 0; - - /* To read, we need an empty buffer of the proper length. - * All that is used is the first byte for address, the remainder - * is just used for timing (and doesn't really have to exist). - */ - tbdf->cbd_bufaddr = (int)tb; - *tb = devaddr | 1; /* Device address */ - rbdf->cbd_bufaddr = (uint)buf; /* Desination buffer */ - tbdf->cbd_datlen = rbdf->cbd_datlen = count + 1; /* Length */ - tbdf->cbd_sc = BD_SC_READY | BD_SC_LAST | BD_SC_WRAP | BD_IIC_START; - rbdf->cbd_sc = BD_SC_EMPTY | BD_SC_WRAP; - - /* Chip bug, set enable here. - */ - i2c->i2c_i2mod = 1; /* Enable */ - i2c->i2c_i2cer = 0xff; - i2c->i2c_i2com = 0x81; /* Start master */ - - /* Wait for IIC transfer. - */ -#if 0 - while ((i2c->i2c_i2cer & 1) == 0); - - if (rbdf->cbd_sc & BD_SC_EMPTY) - printf("IIC read complete but rbuf empty\n"); -#else - temp = 10000000; - while ((tbdf->cbd_sc & BD_SC_READY) && (temp != 0)) - temp--; -#endif - - /* Chip errata, clear enable. - */ - i2c->i2c_i2mod = 0; -} |