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>
39 /* CPU mailbox registers */
40 #define PRCM_MBOX_CPU_VAL (U8500_PRCMU_BASE + 0x0fc)
41 #define PRCM_MBOX_CPU_SET (U8500_PRCMU_BASE + 0x100)
42 #define PRCM_MBOX_CPU_CLR (U8500_PRCMU_BASE + 0x104)
44 static int prcmu_is_ready(void)
46 int ready = readb(PRCM_XP70_CUR_PWR_STATE) == AP_EXECUTE;
48 printf("PRCMU firmware not ready\n");
52 static int _wait_for_req_complete(int num)
56 /* checking any already on-going transaction */
57 while ((readl(PRCM_MBOX_CPU_VAL) & (1 << num)) && timeout--)
62 /* Set an interrupt to XP70 */
63 writel(1 << num, PRCM_MBOX_CPU_SET);
65 while ((readl(PRCM_MBOX_CPU_VAL) & (1 << num)) && timeout--)
69 printf("PRCMU operation timed out\n");
77 * prcmu_i2c_read - PRCMU - 4500 communication using PRCMU I2C
78 * @reg: - db8500 register bank to be accessed
79 * @slave: - db8500 register to be accessed
80 * Returns: ACK_MB5 value containing the status
82 int prcmu_i2c_read(u8 reg, u16 slave)
87 if (!prcmu_is_ready())
90 debug("\nprcmu_4500_i2c_read:bank=%x;reg=%x;\n",
93 /* prepare the data for mailbox 5 */
94 writeb((reg << 1) | I2CREAD, PRCM_REQ_MB5_I2COPTYPE_REG);
95 writeb((1 << 3) | 0x0, PRCM_REQ_MB5_BIT_FIELDS);
96 writeb(slave, PRCM_REQ_MB5_I2CSLAVE);
97 writeb(0, PRCM_REQ_MB5_I2CVAL);
99 _wait_for_req_complete(REQ_MB5);
101 /* retrieve values */
102 debug("ack-mb5:transfer status = %x\n",
103 readb(PRCM_ACK_MB5_STATUS));
104 debug("ack-mb5:reg bank = %x\n", readb(PRCM_ACK_MB5) >> 1);
105 debug("ack-mb5:slave_add = %x\n",
106 readb(PRCM_ACK_MB5_SLAVE));
107 debug("ack-mb5:reg_val = %d\n", readb(PRCM_ACK_MB5_VAL));
109 i2c_status = readb(PRCM_ACK_MB5_STATUS);
110 i2c_val = readb(PRCM_ACK_MB5_VAL);
112 if (i2c_status == I2C_RD_OK)
116 printf("prcmu_i2c_read:read return status= %d\n",
124 * prcmu_i2c_write - PRCMU-db8500 communication using PRCMU I2C
125 * @reg: - db8500 register bank to be accessed
126 * @slave: - db800 register to be written to
127 * @reg_data: - the data to write
128 * Returns: ACK_MB5 value containing the status
130 int prcmu_i2c_write(u8 reg, u16 slave, u8 reg_data)
134 if (!prcmu_is_ready())
137 debug("\nprcmu_4500_i2c_write:bank=%x;reg=%x;\n",
140 /* prepare the data for mailbox 5 */
141 writeb((reg << 1) | I2CWRITE, PRCM_REQ_MB5_I2COPTYPE_REG);
142 writeb((1 << 3) | 0x0, PRCM_REQ_MB5_BIT_FIELDS);
143 writeb(slave, PRCM_REQ_MB5_I2CSLAVE);
144 writeb(reg_data, PRCM_REQ_MB5_I2CVAL);
146 debug("\ncpu_is_u8500v11\n");
147 _wait_for_req_complete(REQ_MB5);
149 /* retrieve values */
150 debug("ack-mb5:transfer status = %x\n",
151 readb(PRCM_ACK_MB5_STATUS));
152 debug("ack-mb5:reg bank = %x\n", readb(PRCM_ACK_MB5) >> 1);
153 debug("ack-mb5:slave_add = %x\n",
154 readb(PRCM_ACK_MB5_SLAVE));
155 debug("ack-mb5:reg_val = %d\n", readb(PRCM_ACK_MB5_VAL));
157 i2c_status = readb(PRCM_ACK_MB5_STATUS);
158 debug("\ni2c_status = %x\n", i2c_status);
159 if (i2c_status == I2C_WR_OK)
162 printf("ape-i2c: i2c_status : 0x%x\n", i2c_status);