* (C) Copyright 2003 Pengutronix e.K.
* Robert Schwebel <r.schwebel@pengutronix.de>
*
- * See file CREDITS for list of people who contributed to this
- * project.
+ * (C) Copyright 2011 Marvell Inc.
+ * Lei Wen <leiwen@marvell.com>
*
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation; either version 2 of
- * the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
- * MA 02111-1307 USA
+ * SPDX-License-Identifier: GPL-2.0+
*
* Back ported to the 8xx platform (from the 8260 platform) by
* Murray.Jensen@cmst.csiro.au, 27-Jan-01.
#include <asm/io.h>
#ifdef CONFIG_HARD_I2C
-
-/*
- * - CONFIG_SYS_I2C_SPEED
- * - I2C_PXA_SLAVE_ADDR
- */
-
-#include <asm/arch/hardware.h>
-#include <asm/arch/pxa-regs.h>
#include <i2c.h>
-
-#if (CONFIG_SYS_I2C_SPEED == 400000)
-#define I2C_ICR_INIT (ICR_FM | ICR_BEIE | ICR_IRFIE | ICR_ITEIE | ICR_GCD \
- | ICR_SCLE)
-#else
-#define I2C_ICR_INIT (ICR_BEIE | ICR_IRFIE | ICR_ITEIE | ICR_GCD | ICR_SCLE)
-#endif
-
-#define I2C_ISR_INIT 0x7FF
+#include "mv_i2c.h"
#ifdef DEBUG_I2C
#define PRINTD(x) printf x
#define PRINTD(x)
#endif
-/* Shall the current transfer have a start/stop condition? */
-#define I2C_COND_NORMAL 0
-#define I2C_COND_START 1
-#define I2C_COND_STOP 2
-
-/* Shall the current transfer be ack/nacked or being waited for it? */
-#define I2C_ACKNAK_WAITACK 1
-#define I2C_ACKNAK_SENDACK 2
-#define I2C_ACKNAK_SENDNAK 4
-
-/* Specify who shall transfer the data (master or slave) */
-#define I2C_READ 0
-#define I2C_WRITE 1
-
/* All transfers are described by this data structure */
struct i2c_msg {
u8 condition;
u8 data;
};
+struct mv_i2c {
+ u32 ibmr;
+ u32 pad0;
+ u32 idbr;
+ u32 pad1;
+ u32 icr;
+ u32 pad2;
+ u32 isr;
+ u32 pad3;
+ u32 isar;
+};
+
+static struct mv_i2c *base;
+static void i2c_board_init(struct mv_i2c *base)
+{
+#ifdef CONFIG_SYS_I2C_INIT_BOARD
+ u32 icr;
+ /*
+ * 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.
+ *
+ * disable I2C controller first, otherwhise it thinks we want to
+ * talk to the slave port...
+ */
+ icr = readl(&base->icr);
+ writel(readl(&base->icr) & ~(ICR_SCLE | ICR_IUE), &base->icr);
+
+ i2c_init_board();
+
+ writel(icr, &base->icr);
+#endif
+}
+
+#ifdef CONFIG_I2C_MULTI_BUS
+static u32 i2c_regs[CONFIG_MV_I2C_NUM] = CONFIG_MV_I2C_REG;
+static unsigned int bus_initialized[CONFIG_MV_I2C_NUM];
+static unsigned int current_bus;
+
+int i2c_set_bus_num(unsigned int bus)
+{
+ if ((bus < 0) || (bus >= CONFIG_MV_I2C_NUM)) {
+ printf("Bad bus: %d\n", bus);
+ return -1;
+ }
+
+ base = (struct mv_i2c *)i2c_regs[bus];
+ current_bus = bus;
+
+ if (!bus_initialized[current_bus]) {
+ i2c_board_init(base);
+ bus_initialized[current_bus] = 1;
+ }
+
+ return 0;
+}
+
+unsigned int i2c_get_bus_num(void)
+{
+ return current_bus;
+}
+#endif
+
/*
- * i2c_pxa_reset: - reset the host controller
+ * i2c_reset: - reset the host controller
*
*/
static void i2c_reset(void)
{
- writel(readl(ICR) & ~ICR_IUE, ICR); /* disable unit */
- writel(readl(ICR) | ICR_UR, ICR); /* reset the unit */
+ writel(readl(&base->icr) & ~ICR_IUE, &base->icr); /* disable unit */
+ writel(readl(&base->icr) | ICR_UR, &base->icr); /* reset the unit */
udelay(100);
- writel(readl(ICR) & ~ICR_IUE, ICR); /* disable unit */
-#ifdef CONFIG_CPU_MONAHANS
- /* | CKENB_1_PWM1 | CKENB_0_PWM0); */
- writel(readl(CKENB) | (CKENB_4_I2C), CKENB);
-#else /* CONFIG_CPU_MONAHANS */
- /* set the global I2C clock on */
- writel(readl(CKEN) | CKEN14_I2C, CKEN);
-#endif
- writel(I2C_PXA_SLAVE_ADDR, ISAR); /* set our slave address */
- writel(I2C_ICR_INIT, ICR); /* set control reg values */
- writel(I2C_ISR_INIT, ISR); /* set clear interrupt bits */
- writel(readl(ICR) | ICR_IUE, ICR); /* enable unit */
+ writel(readl(&base->icr) & ~ICR_IUE, &base->icr); /* disable unit */
+
+ i2c_clk_enable();
+
+ writel(CONFIG_SYS_I2C_SLAVE, &base->isar); /* set our slave address */
+ writel(I2C_ICR_INIT, &base->icr); /* set control reg values */
+ writel(I2C_ISR_INIT, &base->isr); /* set clear interrupt bits */
+ writel(readl(&base->icr) | ICR_IUE, &base->icr); /* enable unit */
udelay(100);
}
static int i2c_isr_set_cleared(unsigned long set_mask,
unsigned long cleared_mask)
{
- int timeout = 1000;
+ int timeout = 1000, isr;
- while (((ISR & set_mask) != set_mask) || ((ISR & cleared_mask) != 0)) {
+ do {
+ isr = readl(&base->isr);
udelay(10);
if (timeout-- < 0)
return 0;
- }
+ } while (((isr & set_mask) != set_mask)
+ || ((isr & cleared_mask) != 0));
return 1;
}
goto transfer_error_bus_busy;
/* start transmission */
- writel(readl(ICR) & ~ICR_START, ICR);
- writel(readl(ICR) & ~ICR_STOP, ICR);
- writel(msg->data, IDBR);
+ writel(readl(&base->icr) & ~ICR_START, &base->icr);
+ writel(readl(&base->icr) & ~ICR_STOP, &base->icr);
+ writel(msg->data, &base->idbr);
if (msg->condition == I2C_COND_START)
- writel(readl(ICR) | ICR_START, ICR);
+ writel(readl(&base->icr) | ICR_START, &base->icr);
if (msg->condition == I2C_COND_STOP)
- writel(readl(ICR) | ICR_STOP, ICR);
+ writel(readl(&base->icr) | ICR_STOP, &base->icr);
if (msg->acknack == I2C_ACKNAK_SENDNAK)
- writel(readl(ICR) | ICR_ACKNAK, ICR);
+ writel(readl(&base->icr) | ICR_ACKNAK, &base->icr);
if (msg->acknack == I2C_ACKNAK_SENDACK)
- writel(readl(ICR) & ~ICR_ACKNAK, ICR);
- writel(readl(ICR) & ~ICR_ALDIE, ICR);
- writel(readl(ICR) | ICR_TB, ICR);
+ writel(readl(&base->icr) & ~ICR_ACKNAK, &base->icr);
+ writel(readl(&base->icr) & ~ICR_ALDIE, &base->icr);
+ writel(readl(&base->icr) | ICR_TB, &base->icr);
/* transmit register empty? */
if (!i2c_isr_set_cleared(ISR_ITE, 0))
goto transfer_error_transmit_timeout;
/* clear 'transmit empty' state */
- writel(readl(ISR) | ISR_ITE, ISR);
+ writel(readl(&base->isr) | ISR_ITE, &base->isr);
/* wait for ACK from slave */
if (msg->acknack == I2C_ACKNAK_WAITACK)
goto transfer_error_bus_busy;
/* start receive */
- writel(readl(ICR) & ~ICR_START, ICR);
- writel(readl(ICR) & ~ICR_STOP, ICR);
+ writel(readl(&base->icr) & ~ICR_START, &base->icr);
+ writel(readl(&base->icr) & ~ICR_STOP, &base->icr);
if (msg->condition == I2C_COND_START)
- writel(readl(ICR) | ICR_START, ICR);
+ writel(readl(&base->icr) | ICR_START, &base->icr);
if (msg->condition == I2C_COND_STOP)
- writel(readl(ICR) | ICR_STOP, ICR);
+ writel(readl(&base->icr) | ICR_STOP, &base->icr);
if (msg->acknack == I2C_ACKNAK_SENDNAK)
- writel(readl(ICR) | ICR_ACKNAK, ICR);
+ writel(readl(&base->icr) | ICR_ACKNAK, &base->icr);
if (msg->acknack == I2C_ACKNAK_SENDACK)
- writel(readl(ICR) & ~ICR_ACKNAK, ICR);
- writel(readl(ICR) & ~ICR_ALDIE, ICR);
- writel(readl(ICR) | ICR_TB, ICR);
+ writel(readl(&base->icr) & ~ICR_ACKNAK, &base->icr);
+ writel(readl(&base->icr) & ~ICR_ALDIE, &base->icr);
+ writel(readl(&base->icr) | ICR_TB, &base->icr);
/* receive register full? */
if (!i2c_isr_set_cleared(ISR_IRF, 0))
goto transfer_error_receive_timeout;
- msg->data = readl(IDBR);
+ msg->data = readl(&base->idbr);
/* clear 'receive empty' state */
- writel(readl(ISR) | ISR_IRF, ISR);
-
+ writel(readl(&base->isr) | ISR_IRF, &base->isr);
break;
default:
goto transfer_error_illegal_param;
ret = -6; goto i2c_transfer_finish;
i2c_transfer_finish:
- PRINTD(("i2c_transfer: ISR: 0x%04x\n", ISR));
+ PRINTD(("i2c_transfer: ISR: 0x%04x\n", readl(&base->isr)));
i2c_reset();
return ret;
}
/* ------------------------------------------------------------------------ */
void i2c_init(int speed, int slaveaddr)
{
-#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. */
- i2c_init_board();
+#ifdef CONFIG_I2C_MULTI_BUS
+ current_bus = 0;
+ base = (struct mv_i2c *)i2c_regs[current_bus];
+#else
+ base = (struct mv_i2c *)CONFIG_MV_I2C_REG;
#endif
+
+ i2c_board_init(base);
}
/*
projects / karo-tx-uboot.git / blobdiff