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gerrit.cesnet.cz / github / trini / u-boot / 2cc1aa2e0010249fe671e38eb412d0cbefb0bf73 / . / arch / arm / cpu / armv7 / u8500 / prcmu.c
blob: 26ffdc2e02043d8b0825b56a97c40129aec25502 [file] [log] [blame]
John Rigbyafbf8892011-04-19 10:42:42 +0000[diff] [blame]1/*
2 * Copyright (C) 2009 ST-Ericsson SA
3 *
4 * Adapted from the Linux version:
5 * Author: Kumar Sanghvi <kumar.sanghvi@stericsson.com>
6 *
Wolfgang Denk1a459662013-07-08 09:37:19 +0200[diff] [blame]7 * SPDX-License-Identifier: GPL-2.0+
John Rigbyafbf8892011-04-19 10:42:42 +0000[diff] [blame]8 */
9
10/*
11 * NOTE: This currently does not support the I2C workaround access method.
12 */
13
14#include <common.h>
15#include <config.h>
16#include <asm/io.h>
17#include <asm/arch/hardware.h>
18#include <asm/types.h>
19#include <asm/io.h>
20#include <asm/errno.h>
Mathieu J. Poirier42cb8fb2012-07-31 08:59:24 +0000[diff] [blame]21#include <asm/arch/prcmu.h>
John Rigbyafbf8892011-04-19 10:42:42 +0000[diff] [blame]22
23/* CPU mailbox registers */
Mathieu J. Poirier101a7692012-07-31 08:59:27 +0000[diff] [blame]24#define PRCMU_I2C_WRITE(slave) \
25 (((slave) << 1) | I2CWRITE | (1 << 6))
26#define PRCMU_I2C_READ(slave) \
27 (((slave) << 1) | I2CREAD | (1 << 6))
John Rigbyafbf8892011-04-19 10:42:42 +0000[diff] [blame]28
Mathieu J. Poirier9652de72012-07-31 08:59:25 +0000[diff] [blame]29#define I2C_MBOX_BIT (1 << 5)
30
John Rigbyafbf8892011-04-19 10:42:42 +0000[diff] [blame]31static int prcmu_is_ready(void)
32{
33 int ready = readb(PRCM_XP70_CUR_PWR_STATE) == AP_EXECUTE;
34 if (!ready)
35 printf("PRCMU firmware not ready\n");
36 return ready;
37}
38
Mathieu J. Poirier101a7692012-07-31 08:59:27 +0000[diff] [blame]39static int wait_for_i2c_mbx_rdy(void)
John Rigbyafbf8892011-04-19 10:42:42 +0000[diff] [blame]40{
Mathieu J. Poirier101a7692012-07-31 08:59:27 +0000[diff] [blame]41 int timeout = 10000;
John Rigbyafbf8892011-04-19 10:42:42 +0000[diff] [blame]42
Mathieu J. Poirier101a7692012-07-31 08:59:27 +0000[diff] [blame]43 if (readl(PRCM_ARM_IT1_VAL) & I2C_MBOX_BIT) {
44 printf("prcmu: warning i2c mailbox was not acked\n");
45 /* clear mailbox 5 ack irq */
46 writel(I2C_MBOX_BIT, PRCM_ARM_IT1_CLEAR);
47 }
48
49 /* check any already on-going transaction */
50 while ((readl(PRCM_MBOX_CPU_VAL) & I2C_MBOX_BIT) && timeout)
Mathieu J. Poirier42cb8fb2012-07-31 08:59:24 +0000[diff] [blame]51 timeout--;
John Rigbyafbf8892011-04-19 10:42:42 +0000[diff] [blame]52
Mathieu J. Poirier101a7692012-07-31 08:59:27 +0000[diff] [blame]53 if (timeout == 0)
54 return -1;
55
56 return 0;
57}
58
59static int wait_for_i2c_req_done(void)
60{
61 int timeout = 10000;
John Rigbyafbf8892011-04-19 10:42:42 +0000[diff] [blame]62
63 /* Set an interrupt to XP70 */
Mathieu J. Poirier101a7692012-07-31 08:59:27 +0000[diff] [blame]64 writel(I2C_MBOX_BIT, PRCM_MBOX_CPU_SET);
John Rigbyafbf8892011-04-19 10:42:42 +0000[diff] [blame]65
Mathieu J. Poirier101a7692012-07-31 08:59:27 +0000[diff] [blame]66 /* wait for mailbox 5 (i2c) ack */
67 while (!(readl(PRCM_ARM_IT1_VAL) & I2C_MBOX_BIT) && timeout)
Mathieu J. Poirier42cb8fb2012-07-31 08:59:24 +0000[diff] [blame]68 timeout--;
John Rigbyafbf8892011-04-19 10:42:42 +0000[diff] [blame]69
Mathieu J. Poirier101a7692012-07-31 08:59:27 +0000[diff] [blame]70 if (timeout == 0)
John Rigbyafbf8892011-04-19 10:42:42 +0000[diff] [blame]71 return -1;
John Rigbyafbf8892011-04-19 10:42:42 +0000[diff] [blame]72
73 return 0;
74}
75
76/**
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
81 */
82int prcmu_i2c_read(u8 reg, u16 slave)
83{
84 uint8_t i2c_status;
85 uint8_t i2c_val;
Mathieu J. Poirier101a7692012-07-31 08:59:27 +0000[diff] [blame]86 int ret;
John Rigbyafbf8892011-04-19 10:42:42 +0000[diff] [blame]87
88 if (!prcmu_is_ready())
89 return -1;
90
91 debug("\nprcmu_4500_i2c_read:bank=%x;reg=%x;\n",
92 reg, slave);
93
Mathieu J. Poirier101a7692012-07-31 08:59:27 +0000[diff] [blame]94 ret = wait_for_i2c_mbx_rdy();
95 if (ret) {
96 printf("prcmu_i2c_read: mailbox became not ready\n");
97 return ret;
98 }
99
John Rigbyafbf8892011-04-19 10:42:42 +0000[diff] [blame]100 /* prepare the data for mailbox 5 */
Mathieu J. Poirier101a7692012-07-31 08:59:27 +0000[diff] [blame]101 writeb(PRCMU_I2C_READ(reg), PRCM_REQ_MB5_I2COPTYPE_REG);
John Rigbyafbf8892011-04-19 10:42:42 +0000[diff] [blame]102 writeb((1 << 3) | 0x0, PRCM_REQ_MB5_BIT_FIELDS);
103 writeb(slave, PRCM_REQ_MB5_I2CSLAVE);
104 writeb(0, PRCM_REQ_MB5_I2CVAL);
105
Mathieu J. Poirier101a7692012-07-31 08:59:27 +0000[diff] [blame]106 ret = wait_for_i2c_req_done();
107 if (ret) {
108 printf("prcmu_i2c_read: mailbox request timed out\n");
109 return ret;
110 }
John Rigbyafbf8892011-04-19 10:42:42 +0000[diff] [blame]111
112 /* retrieve values */
113 debug("ack-mb5:transfer status = %x\n",
114 readb(PRCM_ACK_MB5_STATUS));
115 debug("ack-mb5:reg bank = %x\n", readb(PRCM_ACK_MB5) >> 1);
116 debug("ack-mb5:slave_add = %x\n",
117 readb(PRCM_ACK_MB5_SLAVE));
118 debug("ack-mb5:reg_val = %d\n", readb(PRCM_ACK_MB5_VAL));
119
120 i2c_status = readb(PRCM_ACK_MB5_STATUS);
121 i2c_val = readb(PRCM_ACK_MB5_VAL);
Mathieu J. Poirier101a7692012-07-31 08:59:27 +0000[diff] [blame]122 /* clear mailbox 5 ack irq */
123 writel(I2C_MBOX_BIT, PRCM_ARM_IT1_CLEAR);
John Rigbyafbf8892011-04-19 10:42:42 +0000[diff] [blame]124
125 if (i2c_status == I2C_RD_OK)
126 return i2c_val;
John Rigbyafbf8892011-04-19 10:42:42 +0000[diff] [blame]127
Mathieu J. Poirier101a7692012-07-31 08:59:27 +0000[diff] [blame]128 printf("prcmu_i2c_read:read return status= %d\n", i2c_status);
129 return -1;
John Rigbyafbf8892011-04-19 10:42:42 +0000[diff] [blame]130}
131
132/**
133 * prcmu_i2c_write - PRCMU-db8500 communication using PRCMU I2C
134 * @reg: - db8500 register bank to be accessed
135 * @slave: - db800 register to be written to
136 * @reg_data: - the data to write
137 * Returns: ACK_MB5 value containing the status
138 */
139int prcmu_i2c_write(u8 reg, u16 slave, u8 reg_data)
140{
141 uint8_t i2c_status;
Mathieu J. Poirier101a7692012-07-31 08:59:27 +0000[diff] [blame]142 int ret;
John Rigbyafbf8892011-04-19 10:42:42 +0000[diff] [blame]143
144 if (!prcmu_is_ready())
145 return -1;
146
147 debug("\nprcmu_4500_i2c_write:bank=%x;reg=%x;\n",
148 reg, slave);
149
Mathieu J. Poirier101a7692012-07-31 08:59:27 +0000[diff] [blame]150 ret = wait_for_i2c_mbx_rdy();
151 if (ret) {
152 printf("prcmu_i2c_write: mailbox became not ready\n");
153 return ret;
154 }
155
John Rigbyafbf8892011-04-19 10:42:42 +0000[diff] [blame]156 /* prepare the data for mailbox 5 */
Mathieu J. Poirier101a7692012-07-31 08:59:27 +0000[diff] [blame]157 writeb(PRCMU_I2C_WRITE(reg), PRCM_REQ_MB5_I2COPTYPE_REG);
John Rigbyafbf8892011-04-19 10:42:42 +0000[diff] [blame]158 writeb((1 << 3) | 0x0, PRCM_REQ_MB5_BIT_FIELDS);
159 writeb(slave, PRCM_REQ_MB5_I2CSLAVE);
160 writeb(reg_data, PRCM_REQ_MB5_I2CVAL);
161
Mathieu J. Poirier101a7692012-07-31 08:59:27 +0000[diff] [blame]162 ret = wait_for_i2c_req_done();
163 if (ret) {
164 printf("prcmu_i2c_write: mailbox request timed out\n");
165 return ret;
166 }
John Rigbyafbf8892011-04-19 10:42:42 +0000[diff] [blame]167
168 /* retrieve values */
169 debug("ack-mb5:transfer status = %x\n",
170 readb(PRCM_ACK_MB5_STATUS));
171 debug("ack-mb5:reg bank = %x\n", readb(PRCM_ACK_MB5) >> 1);
172 debug("ack-mb5:slave_add = %x\n",
173 readb(PRCM_ACK_MB5_SLAVE));
174 debug("ack-mb5:reg_val = %d\n", readb(PRCM_ACK_MB5_VAL));
175
176 i2c_status = readb(PRCM_ACK_MB5_STATUS);
177 debug("\ni2c_status = %x\n", i2c_status);
Mathieu J. Poirier101a7692012-07-31 08:59:27 +0000[diff] [blame]178 /* clear mailbox 5 ack irq */
179 writel(I2C_MBOX_BIT, PRCM_ARM_IT1_CLEAR);
180
John Rigbyafbf8892011-04-19 10:42:42 +0000[diff] [blame]181 if (i2c_status == I2C_WR_OK)
182 return 0;
Mathieu J. Poirier101a7692012-07-31 08:59:27 +0000[diff] [blame]183
184 printf("%s: i2c_status : 0x%x\n", __func__, i2c_status);
185 return -1;
John Rigbyafbf8892011-04-19 10:42:42 +0000[diff] [blame]186}
Mathieu J. Poirier9652de72012-07-31 08:59:25 +0000[diff] [blame]187
188void u8500_prcmu_enable(u32 *reg)
189{
190 writel(readl(reg) | (1 << 8), reg);
191}
192
193void db8500_prcmu_init(void)
194{
195 /* Enable timers */
196 writel(1 << 17, PRCM_TCR);
197
198 u8500_prcmu_enable((u32 *)PRCM_PER1CLK_MGT_REG);
199 u8500_prcmu_enable((u32 *)PRCM_PER2CLK_MGT_REG);
200 u8500_prcmu_enable((u32 *)PRCM_PER3CLK_MGT_REG);
201 /* PER4CLK does not exist */
202 u8500_prcmu_enable((u32 *)PRCM_PER5CLK_MGT_REG);
203 u8500_prcmu_enable((u32 *)PRCM_PER6CLK_MGT_REG);
204 /* Only exists in ED but is always ok to write to */
205 u8500_prcmu_enable((u32 *)PRCM_PER7CLK_MGT_REG);
206
207 u8500_prcmu_enable((u32 *)PRCM_UARTCLK_MGT_REG);
208 u8500_prcmu_enable((u32 *)PRCM_I2CCLK_MGT_REG);
209
210 u8500_prcmu_enable((u32 *)PRCM_SDMMCCLK_MGT_REG);
211
212 /* Clean up the mailbox interrupts after pre-u-boot code. */
213 writel(I2C_MBOX_BIT, PRCM_ARM_IT1_CLEAR);
214}