summaryrefslogtreecommitdiff
path: root/arch/powerpc/cpu/mpc512x/i2c.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/powerpc/cpu/mpc512x/i2c.c')
-rw-r--r--arch/powerpc/cpu/mpc512x/i2c.c386
1 files changed, 0 insertions, 386 deletions
diff --git a/arch/powerpc/cpu/mpc512x/i2c.c b/arch/powerpc/cpu/mpc512x/i2c.c
deleted file mode 100644
index 15d519a116..0000000000
--- a/arch/powerpc/cpu/mpc512x/i2c.c
+++ /dev/null
@@ -1,386 +0,0 @@
-/*
- * (C) Copyright 2003 - 2009
- * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
- *
- * SPDX-License-Identifier: GPL-2.0+
- *
- * Based on the MPC5xxx code.
- */
-
-#include <common.h>
-#include <asm/io.h>
-
-DECLARE_GLOBAL_DATA_PTR;
-
-#ifdef CONFIG_HARD_I2C
-
-#include <i2c.h>
-
-/* by default set I2C bus 0 active */
-static unsigned int bus_num __attribute__ ((section (".data"))) = 0;
-
-#define I2C_TIMEOUT 100
-#define I2C_RETRIES 3
-
-struct mpc512x_i2c_tap {
- int scl2tap;
- int tap2tap;
-};
-
-static int mpc_reg_in(volatile u32 *reg);
-static void mpc_reg_out(volatile u32 *reg, int val, int mask);
-static int wait_for_bb(void);
-static int wait_for_pin(int *status);
-static int do_address(uchar chip, char rdwr_flag);
-static int send_bytes(uchar chip, char *buf, int len);
-static int receive_bytes(uchar chip, char *buf, int len);
-static int mpc_get_fdr(int);
-
-static int mpc_reg_in (volatile u32 *reg)
-{
- int ret = in_be32(reg) >> 24;
-
- return ret;
-}
-
-static void mpc_reg_out (volatile u32 *reg, int val, int mask)
-{
- if (!mask) {
- out_be32(reg, val << 24);
- } else {
- clrsetbits_be32(reg, mask << 24, (val & mask) << 24);
- }
-}
-
-static int wait_for_bb (void)
-{
- volatile immap_t *im = (immap_t *) CONFIG_SYS_IMMR;
- volatile i2c512x_dev_t *regs = &im->i2c.dev[bus_num];
- int timeout = I2C_TIMEOUT;
- int status;
-
- status = mpc_reg_in (&regs->msr);
-
- while (timeout-- && (status & I2C_BB)) {
- mpc_reg_out (&regs->mcr, I2C_STA, I2C_STA);
- (void)mpc_reg_in(&regs->mdr);
- mpc_reg_out (&regs->mcr, 0, I2C_STA);
- mpc_reg_out (&regs->mcr, 0, 0);
- mpc_reg_out (&regs->mcr, I2C_EN, 0);
-
- udelay (1000);
- status = mpc_reg_in (&regs->msr);
- }
-
- return (status & I2C_BB);
-}
-
-static int wait_for_pin (int *status)
-{
- volatile immap_t *im = (immap_t *) CONFIG_SYS_IMMR;
- volatile i2c512x_dev_t *regs = &im->i2c.dev[bus_num];
- int timeout = I2C_TIMEOUT;
-
- *status = mpc_reg_in (&regs->msr);
-
- while (timeout-- && !(*status & I2C_IF)) {
- udelay (1000);
- *status = mpc_reg_in (&regs->msr);
- }
-
- if (!(*status & I2C_IF)) {
- return -1;
- }
-
- mpc_reg_out (&regs->msr, 0, I2C_IF);
-
- return 0;
-}
-
-static int do_address (uchar chip, char rdwr_flag)
-{
- volatile immap_t *im = (immap_t *) CONFIG_SYS_IMMR;
- volatile i2c512x_dev_t *regs = &im->i2c.dev[bus_num];
- int status;
-
- chip <<= 1;
-
- if (rdwr_flag) {
- chip |= 1;
- }
-
- mpc_reg_out (&regs->mcr, I2C_TX, I2C_TX);
- mpc_reg_out (&regs->mdr, chip, 0);
-
- if (wait_for_pin (&status)) {
- return -2;
- }
-
- if (status & I2C_RXAK) {
- return -3;
- }
-
- return 0;
-}
-
-static int send_bytes (uchar chip, char *buf, int len)
-{
- volatile immap_t *im = (immap_t *) CONFIG_SYS_IMMR;
- volatile i2c512x_dev_t *regs = &im->i2c.dev[bus_num];
- int wrcount;
- int status;
-
- for (wrcount = 0; wrcount < len; ++wrcount) {
-
- mpc_reg_out (&regs->mdr, buf[wrcount], 0);
-
- if (wait_for_pin (&status)) {
- break;
- }
-
- if (status & I2C_RXAK) {
- break;
- }
-
- }
-
- return !(wrcount == len);
-}
-
-static int receive_bytes (uchar chip, char *buf, int len)
-{
- volatile immap_t *im = (immap_t *) CONFIG_SYS_IMMR;
- volatile i2c512x_dev_t *regs = &im->i2c.dev[bus_num];
- int dummy = 1;
- int rdcount = 0;
- int status;
- int i;
-
- mpc_reg_out (&regs->mcr, 0, I2C_TX);
-
- for (i = 0; i < len; ++i) {
- buf[rdcount] = mpc_reg_in (&regs->mdr);
-
- if (dummy) {
- dummy = 0;
- } else {
- rdcount++;
- }
-
- if (wait_for_pin (&status)) {
- return -4;
- }
- }
-
- mpc_reg_out (&regs->mcr, I2C_TXAK, I2C_TXAK);
- buf[rdcount++] = mpc_reg_in (&regs->mdr);
-
- if (wait_for_pin (&status)) {
- return -5;
- }
-
- mpc_reg_out (&regs->mcr, 0, I2C_TXAK);
-
- return 0;
-}
-
-/**************** I2C API ****************/
-
-void i2c_init (int speed, int saddr)
-{
- volatile immap_t *im = (immap_t *) CONFIG_SYS_IMMR;
- int i;
-
- for (i = 0; i < I2C_BUS_CNT; i++){
- volatile i2c512x_dev_t *regs = &im->i2c.dev[i];
-
- mpc_reg_out (&regs->mcr, 0, 0);
-
- /* Set clock */
- mpc_reg_out (&regs->mfdr, mpc_get_fdr (speed), 0);
- mpc_reg_out (&regs->madr, saddr << 1, 0);
-
- /* Enable module */
- mpc_reg_out (&regs->mcr, I2C_EN, I2C_INIT_MASK);
- mpc_reg_out (&regs->msr, 0, I2C_IF);
- }
-
- /* Disable interrupts */
- out_be32(&im->i2c.icr, 0);
-
- /* Turn off filters */
- out_be32(&im->i2c.mifr, 0);
-}
-
-static int mpc_get_fdr (int speed)
-{
- static int fdr = -1;
-
- if (fdr == -1) {
- ulong best_speed = 0;
- ulong divider;
- ulong ips, scl;
- ulong bestmatch = 0xffffffffUL;
- int best_i = 0, best_j = 0, i, j;
- int SCL_Tap[] = { 9, 10, 12, 15, 5, 6, 7, 8};
- struct mpc512x_i2c_tap scltap[] = {
- {4, 1},
- {4, 2},
- {6, 4},
- {6, 8},
- {14, 16},
- {30, 32},
- {62, 64},
- {126, 128}
- };
-
- ips = gd->arch.ips_clk;
- for (i = 7; i >= 0; i--) {
- for (j = 7; j >= 0; j--) {
- scl = 2 * (scltap[j].scl2tap +
- (SCL_Tap[i] - 1) * scltap[j].tap2tap
- + 2);
- if (ips <= speed*scl) {
- if ((speed*scl - ips) < bestmatch) {
- bestmatch = speed*scl - ips;
- best_i = i;
- best_j = j;
- best_speed = ips/scl;
- }
- }
- }
- }
- divider = (best_i & 3) | ((best_i & 4) << 3) | (best_j << 2);
- if (gd->flags & GD_FLG_RELOC) {
- fdr = divider;
- } else {
- debug("%ld kHz, \n", best_speed / 1000);
- return divider;
- }
- }
-
- return fdr;
-}
-
-int i2c_probe (uchar chip)
-{
- volatile immap_t *im = (immap_t *) CONFIG_SYS_IMMR;
- volatile i2c512x_dev_t *regs = &im->i2c.dev[bus_num];
- int i;
-
- for (i = 0; i < I2C_RETRIES; i++) {
- mpc_reg_out (&regs->mcr, I2C_STA, I2C_STA);
-
- if (! do_address (chip, 0)) {
- mpc_reg_out (&regs->mcr, 0, I2C_STA);
- udelay (500);
- break;
- }
-
- mpc_reg_out (&regs->mcr, 0, I2C_STA);
- udelay (500);
- }
-
- return (i == I2C_RETRIES);
-}
-
-int i2c_read (uchar chip, uint addr, int alen, uchar *buf, int len)
-{
- volatile immap_t *im = (immap_t *) CONFIG_SYS_IMMR;
- volatile i2c512x_dev_t *regs = &im->i2c.dev[bus_num];
- char xaddr[4];
- int ret = -1;
-
- xaddr[0] = (addr >> 24) & 0xFF;
- xaddr[1] = (addr >> 16) & 0xFF;
- xaddr[2] = (addr >> 8) & 0xFF;
- xaddr[3] = addr & 0xFF;
-
- if (wait_for_bb ()) {
- printf ("i2c_read: bus is busy\n");
- goto Done;
- }
-
- mpc_reg_out (&regs->mcr, I2C_STA, I2C_STA);
- if (do_address (chip, 0)) {
- printf ("i2c_read: failed to address chip\n");
- goto Done;
- }
-
- if (send_bytes (chip, &xaddr[4-alen], alen)) {
- printf ("i2c_read: send_bytes failed\n");
- goto Done;
- }
-
- mpc_reg_out (&regs->mcr, I2C_RSTA, I2C_RSTA);
- if (do_address (chip, 1)) {
- printf ("i2c_read: failed to address chip\n");
- goto Done;
- }
-
- if (receive_bytes (chip, (char *)buf, len)) {
- printf ("i2c_read: receive_bytes failed\n");
- goto Done;
- }
-
- ret = 0;
-Done:
- mpc_reg_out (&regs->mcr, 0, I2C_STA);
- return ret;
-}
-
-int i2c_write (uchar chip, uint addr, int alen, uchar *buf, int len)
-{
- volatile immap_t *im = (immap_t *) CONFIG_SYS_IMMR;
- volatile i2c512x_dev_t *regs = &im->i2c.dev[bus_num];
- char xaddr[4];
- int ret = -1;
-
- xaddr[0] = (addr >> 24) & 0xFF;
- xaddr[1] = (addr >> 16) & 0xFF;
- xaddr[2] = (addr >> 8) & 0xFF;
- xaddr[3] = addr & 0xFF;
-
- if (wait_for_bb ()) {
- printf ("i2c_write: bus is busy\n");
- goto Done;
- }
-
- mpc_reg_out (&regs->mcr, I2C_STA, I2C_STA);
- if (do_address (chip, 0)) {
- printf ("i2c_write: failed to address chip\n");
- goto Done;
- }
-
- if (send_bytes (chip, &xaddr[4-alen], alen)) {
- printf ("i2c_write: send_bytes failed\n");
- goto Done;
- }
-
- if (send_bytes (chip, (char *)buf, len)) {
- printf ("i2c_write: send_bytes failed\n");
- goto Done;
- }
-
- ret = 0;
-Done:
- mpc_reg_out (&regs->mcr, 0, I2C_STA);
- return ret;
-}
-
-int i2c_set_bus_num (unsigned int bus)
-{
- if (bus >= I2C_BUS_CNT) {
- return -1;
- }
- bus_num = bus;
-
- return 0;
-}
-
-unsigned int i2c_get_bus_num (void)
-{
- return bus_num;
-}
-
-#endif /* CONFIG_HARD_I2C */
generated by cgit (git 2.34.1) at 2024-12-27 03:36:26 +0000