src/soc/qualcomm/ipq806x/i2c.c

   1 /* SPDX-License-Identifier: BSD-3-Clause */
   2
   3 #include <console/console.h>
   4 #include <device/i2c_simple.h>
   5 #include <string.h>
   6 #include <soc/gsbi.h>
   7 #include <soc/qup.h>
   8
   9 static qup_config_t gsbi1_qup_config = {
  10         QUP_MINICORE_I2C_MASTER,
  11         100000,
  12         24000000,
  13         QUP_MODE_FIFO,
  14         0
  15 };
  16
  17 static qup_config_t gsbi4_qup_config = {
  18         QUP_MINICORE_I2C_MASTER,
  19         100000,
  20         24000000,
  21         QUP_MODE_FIFO,
  22         0
  23 };
  24
  25 static qup_config_t gsbi7_qup_config = {
  26         QUP_MINICORE_I2C_MASTER,
  27         100000,
  28         24000000,
  29         QUP_MODE_FIFO,
  30         0
  31 };
  32
  33 static int i2c_read(uint32_t gsbi_id, uint8_t slave,
  34                     uint8_t *data, int data_len)
  35 {
  36         qup_data_t obj;
  37         qup_return_t qup_ret = 0;
  38
  39         memset(&obj, 0, sizeof(obj));
  40         obj.protocol = QUP_MINICORE_I2C_MASTER;
  41         obj.p.iic.addr = slave;
  42         obj.p.iic.data_len = data_len;
  43         obj.p.iic.data = data;
  44         qup_ret = qup_recv_data(gsbi_id, &obj);
  45
  46         if (QUP_SUCCESS != qup_ret)
  47                 return 1;
  48         else
  49                 return 0;
  50 }
  51
  52 static int i2c_write(uint32_t gsbi_id, uint8_t slave,
  53                      uint8_t *data, int data_len, uint8_t stop_seq)
  54 {
  55         qup_data_t obj;
  56         qup_return_t qup_ret = 0;
  57
  58         memset(&obj, 0, sizeof(obj));
  59         obj.protocol = QUP_MINICORE_I2C_MASTER;
  60         obj.p.iic.addr = slave;
  61         obj.p.iic.data_len = data_len;
  62         obj.p.iic.data = data;
  63         qup_ret = qup_send_data(gsbi_id, &obj, stop_seq);
  64
  65         if (QUP_SUCCESS != qup_ret)
  66                 return 1;
  67         else
  68                 return 0;
  69 }
  70
  71 static int i2c_init(unsigned int bus)
  72 {
  73         unsigned int gsbi_id = bus;
  74         qup_config_t *qup_config;
  75
  76         switch (gsbi_id) {
  77         case GSBI_ID_1:
  78                 qup_config = &gsbi1_qup_config;
  79                 break;
  80         case GSBI_ID_4:
  81                 qup_config = &gsbi4_qup_config;
  82                 break;
  83         case GSBI_ID_7:
  84                 qup_config = &gsbi7_qup_config;
  85                 break;
  86         default:
  87                 printk(BIOS_ERR, "QUP configuration not defined for GSBI%d.\n",
  88                        gsbi_id);
  89                 return 1;
  90         }
  91
  92         if (qup_config->initialized)
  93                 return 0;
  94
  95         if (gsbi_init(gsbi_id, GSBI_PROTO_I2C_ONLY)) {
  96                 printk(BIOS_ERR, "failed to initialize gsbi\n");
  97                 return 1;
  98         }
  99
 100         if (qup_init(gsbi_id, qup_config)) {
 101                 printk(BIOS_ERR, "failed to initialize qup\n");
 102                 return 1;
 103         }
 104
 105         if (qup_reset_i2c_master_status(gsbi_id)) {
 106                 printk(BIOS_ERR, "failed to reset i2c master status\n");
 107                 return 1;
 108         }
 109
 110         qup_config->initialized = 1;
 111         return 0;
 112 }
 113
 114 int platform_i2c_transfer(unsigned int bus, struct i2c_msg *segments,
 115                           int seg_count)
 116 {
 117         struct i2c_msg *seg = segments;
 118         int ret = 0;
 119
 120         if (i2c_init(bus))
 121                 return 1;
 122
 123         while (!ret && seg_count--) {
 124                 if (seg->flags & I2C_M_RD)
 125                         ret = i2c_read(bus, seg->slave, seg->buf, seg->len);
 126                 else
 127                         ret = i2c_write(bus, seg->slave, seg->buf, seg->len,
 128                                         (seg_count ? 0 : 1));
 129                 seg++;
 130         }
 131
 132         if (ret) {
 133                 qup_set_state(bus, QUP_STATE_RESET);
 134                 return 1;
 135         }
 136
 137         return 0;
 138 }