1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * cxd2880_devio_spi.c
4*4882a593Smuzhiyun * Sony CXD2880 DVB-T2/T tuner + demodulator driver
5*4882a593Smuzhiyun * I/O interface via SPI
6*4882a593Smuzhiyun *
7*4882a593Smuzhiyun * Copyright (C) 2016, 2017, 2018 Sony Semiconductor Solutions Corporation
8*4882a593Smuzhiyun */
9*4882a593Smuzhiyun
10*4882a593Smuzhiyun #include "cxd2880_devio_spi.h"
11*4882a593Smuzhiyun
12*4882a593Smuzhiyun #define BURST_WRITE_MAX 128
13*4882a593Smuzhiyun
cxd2880_io_spi_read_reg(struct cxd2880_io * io,enum cxd2880_io_tgt tgt,u8 sub_address,u8 * data,u32 size)14*4882a593Smuzhiyun static int cxd2880_io_spi_read_reg(struct cxd2880_io *io,
15*4882a593Smuzhiyun enum cxd2880_io_tgt tgt,
16*4882a593Smuzhiyun u8 sub_address, u8 *data,
17*4882a593Smuzhiyun u32 size)
18*4882a593Smuzhiyun {
19*4882a593Smuzhiyun int ret = 0;
20*4882a593Smuzhiyun struct cxd2880_spi *spi = NULL;
21*4882a593Smuzhiyun u8 send_data[6];
22*4882a593Smuzhiyun u8 *read_data_top = data;
23*4882a593Smuzhiyun
24*4882a593Smuzhiyun if (!io || !io->if_object || !data)
25*4882a593Smuzhiyun return -EINVAL;
26*4882a593Smuzhiyun
27*4882a593Smuzhiyun if (sub_address + size > 0x100)
28*4882a593Smuzhiyun return -EINVAL;
29*4882a593Smuzhiyun
30*4882a593Smuzhiyun spi = io->if_object;
31*4882a593Smuzhiyun
32*4882a593Smuzhiyun if (tgt == CXD2880_IO_TGT_SYS)
33*4882a593Smuzhiyun send_data[0] = 0x0b;
34*4882a593Smuzhiyun else
35*4882a593Smuzhiyun send_data[0] = 0x0a;
36*4882a593Smuzhiyun
37*4882a593Smuzhiyun send_data[3] = 0;
38*4882a593Smuzhiyun send_data[4] = 0;
39*4882a593Smuzhiyun send_data[5] = 0;
40*4882a593Smuzhiyun
41*4882a593Smuzhiyun while (size > 0) {
42*4882a593Smuzhiyun send_data[1] = sub_address;
43*4882a593Smuzhiyun if (size > 255)
44*4882a593Smuzhiyun send_data[2] = 255;
45*4882a593Smuzhiyun else
46*4882a593Smuzhiyun send_data[2] = size;
47*4882a593Smuzhiyun
48*4882a593Smuzhiyun ret =
49*4882a593Smuzhiyun spi->write_read(spi, send_data, sizeof(send_data),
50*4882a593Smuzhiyun read_data_top, send_data[2]);
51*4882a593Smuzhiyun if (ret)
52*4882a593Smuzhiyun return ret;
53*4882a593Smuzhiyun
54*4882a593Smuzhiyun sub_address += send_data[2];
55*4882a593Smuzhiyun read_data_top += send_data[2];
56*4882a593Smuzhiyun size -= send_data[2];
57*4882a593Smuzhiyun }
58*4882a593Smuzhiyun
59*4882a593Smuzhiyun return ret;
60*4882a593Smuzhiyun }
61*4882a593Smuzhiyun
cxd2880_io_spi_write_reg(struct cxd2880_io * io,enum cxd2880_io_tgt tgt,u8 sub_address,const u8 * data,u32 size)62*4882a593Smuzhiyun static int cxd2880_io_spi_write_reg(struct cxd2880_io *io,
63*4882a593Smuzhiyun enum cxd2880_io_tgt tgt,
64*4882a593Smuzhiyun u8 sub_address,
65*4882a593Smuzhiyun const u8 *data, u32 size)
66*4882a593Smuzhiyun {
67*4882a593Smuzhiyun int ret = 0;
68*4882a593Smuzhiyun struct cxd2880_spi *spi = NULL;
69*4882a593Smuzhiyun u8 send_data[BURST_WRITE_MAX + 4];
70*4882a593Smuzhiyun const u8 *write_data_top = data;
71*4882a593Smuzhiyun
72*4882a593Smuzhiyun if (!io || !io->if_object || !data)
73*4882a593Smuzhiyun return -EINVAL;
74*4882a593Smuzhiyun
75*4882a593Smuzhiyun if (size > BURST_WRITE_MAX)
76*4882a593Smuzhiyun return -EINVAL;
77*4882a593Smuzhiyun
78*4882a593Smuzhiyun if (sub_address + size > 0x100)
79*4882a593Smuzhiyun return -EINVAL;
80*4882a593Smuzhiyun
81*4882a593Smuzhiyun spi = io->if_object;
82*4882a593Smuzhiyun
83*4882a593Smuzhiyun if (tgt == CXD2880_IO_TGT_SYS)
84*4882a593Smuzhiyun send_data[0] = 0x0f;
85*4882a593Smuzhiyun else
86*4882a593Smuzhiyun send_data[0] = 0x0e;
87*4882a593Smuzhiyun
88*4882a593Smuzhiyun while (size > 0) {
89*4882a593Smuzhiyun send_data[1] = sub_address;
90*4882a593Smuzhiyun if (size > 255)
91*4882a593Smuzhiyun send_data[2] = 255;
92*4882a593Smuzhiyun else
93*4882a593Smuzhiyun send_data[2] = size;
94*4882a593Smuzhiyun
95*4882a593Smuzhiyun memcpy(&send_data[3], write_data_top, send_data[2]);
96*4882a593Smuzhiyun
97*4882a593Smuzhiyun if (tgt == CXD2880_IO_TGT_SYS) {
98*4882a593Smuzhiyun send_data[3 + send_data[2]] = 0x00;
99*4882a593Smuzhiyun ret = spi->write(spi, send_data, send_data[2] + 4);
100*4882a593Smuzhiyun } else {
101*4882a593Smuzhiyun ret = spi->write(spi, send_data, send_data[2] + 3);
102*4882a593Smuzhiyun }
103*4882a593Smuzhiyun if (ret)
104*4882a593Smuzhiyun return ret;
105*4882a593Smuzhiyun
106*4882a593Smuzhiyun sub_address += send_data[2];
107*4882a593Smuzhiyun write_data_top += send_data[2];
108*4882a593Smuzhiyun size -= send_data[2];
109*4882a593Smuzhiyun }
110*4882a593Smuzhiyun
111*4882a593Smuzhiyun return ret;
112*4882a593Smuzhiyun }
113*4882a593Smuzhiyun
cxd2880_io_spi_create(struct cxd2880_io * io,struct cxd2880_spi * spi,u8 slave_select)114*4882a593Smuzhiyun int cxd2880_io_spi_create(struct cxd2880_io *io,
115*4882a593Smuzhiyun struct cxd2880_spi *spi, u8 slave_select)
116*4882a593Smuzhiyun {
117*4882a593Smuzhiyun if (!io || !spi)
118*4882a593Smuzhiyun return -EINVAL;
119*4882a593Smuzhiyun
120*4882a593Smuzhiyun io->read_regs = cxd2880_io_spi_read_reg;
121*4882a593Smuzhiyun io->write_regs = cxd2880_io_spi_write_reg;
122*4882a593Smuzhiyun io->write_reg = cxd2880_io_common_write_one_reg;
123*4882a593Smuzhiyun io->if_object = spi;
124*4882a593Smuzhiyun io->i2c_address_sys = 0;
125*4882a593Smuzhiyun io->i2c_address_demod = 0;
126*4882a593Smuzhiyun io->slave_select = slave_select;
127*4882a593Smuzhiyun
128*4882a593Smuzhiyun return 0;
129*4882a593Smuzhiyun }
130