2 * Copyright (C) 2009 ST-Ericsson SA
4 * Adapted from the Linux version:
5 * Author: Kumar Sanghvi <kumar.sanghvi@stericsson.com>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 * This program is free software; you can redistribute it and/or modify
21 * it under the terms of the GNU General Public License version 2
22 * as published by the Free Software Foundation.
26 * NOTE: This currently does not support the I2C workaround access method.
32 #include <asm/arch/hardware.h>
33 #include <asm/types.h>
35 #include <asm/errno.h>
36 #include <asm/arch/prcmu.h>
38 /* CPU mailbox registers */
39 #define PRCM_MBOX_CPU_VAL (U8500_PRCMU_BASE + 0x0fc)
40 #define PRCM_MBOX_CPU_SET (U8500_PRCMU_BASE + 0x100)
41 #define PRCM_MBOX_CPU_CLR (U8500_PRCMU_BASE + 0x104)
43 static int prcmu_is_ready(void)
45 int ready = readb(PRCM_XP70_CUR_PWR_STATE) == AP_EXECUTE;
47 printf("PRCMU firmware not ready\n");
51 static int _wait_for_req_complete(int num)
55 /* checking any already on-going transaction */
56 while ((readl(PRCM_MBOX_CPU_VAL) & (1 << num)) && timeout)
61 /* Set an interrupt to XP70 */
62 writel(1 << num, PRCM_MBOX_CPU_SET);
64 while ((readl(PRCM_MBOX_CPU_VAL) & (1 << num)) && timeout)
68 printf("PRCMU operation timed out\n");
76 * prcmu_i2c_read - PRCMU - 4500 communication using PRCMU I2C
77 * @reg: - db8500 register bank to be accessed
78 * @slave: - db8500 register to be accessed
79 * Returns: ACK_MB5 value containing the status
81 int prcmu_i2c_read(u8 reg, u16 slave)
86 if (!prcmu_is_ready())
89 debug("\nprcmu_4500_i2c_read:bank=%x;reg=%x;\n",
92 /* prepare the data for mailbox 5 */
93 writeb((reg << 1) | I2CREAD, PRCM_REQ_MB5_I2COPTYPE_REG);
94 writeb((1 << 3) | 0x0, PRCM_REQ_MB5_BIT_FIELDS);
95 writeb(slave, PRCM_REQ_MB5_I2CSLAVE);
96 writeb(0, PRCM_REQ_MB5_I2CVAL);
98 _wait_for_req_complete(REQ_MB5);
100 /* retrieve values */
101 debug("ack-mb5:transfer status = %x\n",
102 readb(PRCM_ACK_MB5_STATUS));
103 debug("ack-mb5:reg bank = %x\n", readb(PRCM_ACK_MB5) >> 1);
104 debug("ack-mb5:slave_add = %x\n",
105 readb(PRCM_ACK_MB5_SLAVE));
106 debug("ack-mb5:reg_val = %d\n", readb(PRCM_ACK_MB5_VAL));
108 i2c_status = readb(PRCM_ACK_MB5_STATUS);
109 i2c_val = readb(PRCM_ACK_MB5_VAL);
111 if (i2c_status == I2C_RD_OK)
115 printf("prcmu_i2c_read:read return status= %d\n",
123 * prcmu_i2c_write - PRCMU-db8500 communication using PRCMU I2C
124 * @reg: - db8500 register bank to be accessed
125 * @slave: - db800 register to be written to
126 * @reg_data: - the data to write
127 * Returns: ACK_MB5 value containing the status
129 int prcmu_i2c_write(u8 reg, u16 slave, u8 reg_data)
133 if (!prcmu_is_ready())
136 debug("\nprcmu_4500_i2c_write:bank=%x;reg=%x;\n",
139 /* prepare the data for mailbox 5 */
140 writeb((reg << 1) | I2CWRITE, PRCM_REQ_MB5_I2COPTYPE_REG);
141 writeb((1 << 3) | 0x0, PRCM_REQ_MB5_BIT_FIELDS);
142 writeb(slave, PRCM_REQ_MB5_I2CSLAVE);
143 writeb(reg_data, PRCM_REQ_MB5_I2CVAL);
145 debug("\ncpu_is_u8500v11\n");
146 _wait_for_req_complete(REQ_MB5);
148 /* retrieve values */
149 debug("ack-mb5:transfer status = %x\n",
150 readb(PRCM_ACK_MB5_STATUS));
151 debug("ack-mb5:reg bank = %x\n", readb(PRCM_ACK_MB5) >> 1);
152 debug("ack-mb5:slave_add = %x\n",
153 readb(PRCM_ACK_MB5_SLAVE));
154 debug("ack-mb5:reg_val = %d\n", readb(PRCM_ACK_MB5_VAL));
156 i2c_status = readb(PRCM_ACK_MB5_STATUS);
157 debug("\ni2c_status = %x\n", i2c_status);
158 if (i2c_status == I2C_WR_OK)
161 printf("ape-i2c: i2c_status : 0x%x\n", i2c_status);