* Adapted from the Linux version:
* Author: Kumar Sanghvi <kumar.sanghvi@stericsson.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., 675 Mass Ave, Cambridge, MA 02139, USA.
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2
- * as published by the Free Software Foundation.
+ * SPDX-License-Identifier: GPL-2.0+
*/
/*
#include <asm/arch/prcmu.h>
/* CPU mailbox registers */
-#define PRCM_MBOX_CPU_VAL (U8500_PRCMU_BASE + 0x0fc)
-#define PRCM_MBOX_CPU_SET (U8500_PRCMU_BASE + 0x100)
-#define PRCM_MBOX_CPU_CLR (U8500_PRCMU_BASE + 0x104)
+#define PRCMU_I2C_WRITE(slave) \
+ (((slave) << 1) | I2CWRITE | (1 << 6))
+#define PRCMU_I2C_READ(slave) \
+ (((slave) << 1) | I2CREAD | (1 << 6))
+
+#define I2C_MBOX_BIT (1 << 5)
static int prcmu_is_ready(void)
{
return ready;
}
-static int _wait_for_req_complete(int num)
+static int wait_for_i2c_mbx_rdy(void)
{
- int timeout = 1000;
+ int timeout = 10000;
+
+ if (readl(PRCM_ARM_IT1_VAL) & I2C_MBOX_BIT) {
+ printf("prcmu: warning i2c mailbox was not acked\n");
+ /* clear mailbox 5 ack irq */
+ writel(I2C_MBOX_BIT, PRCM_ARM_IT1_CLEAR);
+ }
- /* checking any already on-going transaction */
- while ((readl(PRCM_MBOX_CPU_VAL) & (1 << num)) && timeout)
+ /* check any already on-going transaction */
+ while ((readl(PRCM_MBOX_CPU_VAL) & I2C_MBOX_BIT) && timeout)
timeout--;
- timeout = 1000;
+ if (timeout == 0)
+ return -1;
+
+ return 0;
+}
+
+static int wait_for_i2c_req_done(void)
+{
+ int timeout = 10000;
/* Set an interrupt to XP70 */
- writel(1 << num, PRCM_MBOX_CPU_SET);
+ writel(I2C_MBOX_BIT, PRCM_MBOX_CPU_SET);
- while ((readl(PRCM_MBOX_CPU_VAL) & (1 << num)) && timeout)
+ /* wait for mailbox 5 (i2c) ack */
+ while (!(readl(PRCM_ARM_IT1_VAL) & I2C_MBOX_BIT) && timeout)
timeout--;
- if (!timeout) {
- printf("PRCMU operation timed out\n");
+ if (timeout == 0)
return -1;
- }
return 0;
}
{
uint8_t i2c_status;
uint8_t i2c_val;
+ int ret;
if (!prcmu_is_ready())
return -1;
debug("\nprcmu_4500_i2c_read:bank=%x;reg=%x;\n",
reg, slave);
+ ret = wait_for_i2c_mbx_rdy();
+ if (ret) {
+ printf("prcmu_i2c_read: mailbox became not ready\n");
+ return ret;
+ }
+
/* prepare the data for mailbox 5 */
- writeb((reg << 1) | I2CREAD, PRCM_REQ_MB5_I2COPTYPE_REG);
+ writeb(PRCMU_I2C_READ(reg), PRCM_REQ_MB5_I2COPTYPE_REG);
writeb((1 << 3) | 0x0, PRCM_REQ_MB5_BIT_FIELDS);
writeb(slave, PRCM_REQ_MB5_I2CSLAVE);
writeb(0, PRCM_REQ_MB5_I2CVAL);
- _wait_for_req_complete(REQ_MB5);
+ ret = wait_for_i2c_req_done();
+ if (ret) {
+ printf("prcmu_i2c_read: mailbox request timed out\n");
+ return ret;
+ }
/* retrieve values */
debug("ack-mb5:transfer status = %x\n",
i2c_status = readb(PRCM_ACK_MB5_STATUS);
i2c_val = readb(PRCM_ACK_MB5_VAL);
+ /* clear mailbox 5 ack irq */
+ writel(I2C_MBOX_BIT, PRCM_ARM_IT1_CLEAR);
if (i2c_status == I2C_RD_OK)
return i2c_val;
- else {
-
- printf("prcmu_i2c_read:read return status= %d\n",
- i2c_status);
- return -1;
- }
+ printf("prcmu_i2c_read:read return status= %d\n", i2c_status);
+ return -1;
}
/**
int prcmu_i2c_write(u8 reg, u16 slave, u8 reg_data)
{
uint8_t i2c_status;
+ int ret;
if (!prcmu_is_ready())
return -1;
debug("\nprcmu_4500_i2c_write:bank=%x;reg=%x;\n",
reg, slave);
+ ret = wait_for_i2c_mbx_rdy();
+ if (ret) {
+ printf("prcmu_i2c_write: mailbox became not ready\n");
+ return ret;
+ }
+
/* prepare the data for mailbox 5 */
- writeb((reg << 1) | I2CWRITE, PRCM_REQ_MB5_I2COPTYPE_REG);
+ writeb(PRCMU_I2C_WRITE(reg), PRCM_REQ_MB5_I2COPTYPE_REG);
writeb((1 << 3) | 0x0, PRCM_REQ_MB5_BIT_FIELDS);
writeb(slave, PRCM_REQ_MB5_I2CSLAVE);
writeb(reg_data, PRCM_REQ_MB5_I2CVAL);
- debug("\ncpu_is_u8500v11\n");
- _wait_for_req_complete(REQ_MB5);
+ ret = wait_for_i2c_req_done();
+ if (ret) {
+ printf("prcmu_i2c_write: mailbox request timed out\n");
+ return ret;
+ }
/* retrieve values */
debug("ack-mb5:transfer status = %x\n",
i2c_status = readb(PRCM_ACK_MB5_STATUS);
debug("\ni2c_status = %x\n", i2c_status);
+ /* clear mailbox 5 ack irq */
+ writel(I2C_MBOX_BIT, PRCM_ARM_IT1_CLEAR);
+
if (i2c_status == I2C_WR_OK)
return 0;
- else {
- printf("ape-i2c: i2c_status : 0x%x\n", i2c_status);
- return -1;
- }
+
+ printf("%s: i2c_status : 0x%x\n", __func__, i2c_status);
+ return -1;
+}
+
+void u8500_prcmu_enable(u32 *reg)
+{
+ writel(readl(reg) | (1 << 8), reg);
+}
+
+void db8500_prcmu_init(void)
+{
+ /* Enable timers */
+ writel(1 << 17, PRCM_TCR);
+
+ u8500_prcmu_enable((u32 *)PRCM_PER1CLK_MGT_REG);
+ u8500_prcmu_enable((u32 *)PRCM_PER2CLK_MGT_REG);
+ u8500_prcmu_enable((u32 *)PRCM_PER3CLK_MGT_REG);
+ /* PER4CLK does not exist */
+ u8500_prcmu_enable((u32 *)PRCM_PER5CLK_MGT_REG);
+ u8500_prcmu_enable((u32 *)PRCM_PER6CLK_MGT_REG);
+ /* Only exists in ED but is always ok to write to */
+ u8500_prcmu_enable((u32 *)PRCM_PER7CLK_MGT_REG);
+
+ u8500_prcmu_enable((u32 *)PRCM_UARTCLK_MGT_REG);
+ u8500_prcmu_enable((u32 *)PRCM_I2CCLK_MGT_REG);
+
+ u8500_prcmu_enable((u32 *)PRCM_SDMMCCLK_MGT_REG);
+
+ /* Clean up the mailbox interrupts after pre-u-boot code. */
+ writel(I2C_MBOX_BIT, PRCM_ARM_IT1_CLEAR);
}
projects / u-boot / blobdiff