blob: e7b0982fb654681e4b9650d7ce8fe9a9c23d8acd [file] [log] [blame]
Googlere00b8eb2019-07-08 16:37:07 -07001/*
2 * (C) Copyright 2009
3 * Marvell Semiconductor <www.marvell.com>
4 * Written-by: Prafulla Wadaskar <prafulla@marvell.com>
5 *
6 * Derived from drivers/spi/mpc8xxx_spi.c
Googler695f9d92023-09-11 15:38:29 +08007 *
8 * SPDX-License-Identifier: GPL-2.0+
Googlere00b8eb2019-07-08 16:37:07 -07009 */
10
11#include <common.h>
Googlere00b8eb2019-07-08 16:37:07 -070012#include <malloc.h>
13#include <spi.h>
14#include <asm/io.h>
15#include <asm/arch/soc.h>
16#ifdef CONFIG_KIRKWOOD
17#include <asm/arch/mpp.h>
18#endif
19#include <asm/arch-mvebu/spi.h>
20
Googlere00b8eb2019-07-08 16:37:07 -070021static struct kwspi_registers *spireg =
22 (struct kwspi_registers *)MVEBU_SPI_BASE;
23
24#ifdef CONFIG_KIRKWOOD
25static u32 cs_spi_mpp_back[2];
26#endif
27
28struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs,
29 unsigned int max_hz, unsigned int mode)
30{
31 struct spi_slave *slave;
32 u32 data;
33#ifdef CONFIG_KIRKWOOD
34 static const u32 kwspi_mpp_config[2][2] = {
35 { MPP0_SPI_SCn, 0 }, /* if cs == 0 */
36 { MPP7_SPI_SCn, 0 } /* if cs != 0 */
37 };
38#endif
39
40 if (!spi_cs_is_valid(bus, cs))
41 return NULL;
42
43 slave = spi_alloc_slave_base(bus, cs);
44 if (!slave)
45 return NULL;
46
47 writel(KWSPI_SMEMRDY, &spireg->ctrl);
48
49 /* calculate spi clock prescaller using max_hz */
50 data = ((CONFIG_SYS_TCLK / 2) / max_hz) + 0x10;
51 data = data < KWSPI_CLKPRESCL_MIN ? KWSPI_CLKPRESCL_MIN : data;
52 data = data > KWSPI_CLKPRESCL_MASK ? KWSPI_CLKPRESCL_MASK : data;
53
54 /* program spi clock prescaller using max_hz */
55 writel(KWSPI_ADRLEN_3BYTE | data, &spireg->cfg);
56 debug("data = 0x%08x\n", data);
57
58 writel(KWSPI_SMEMRDIRQ, &spireg->irq_cause);
59 writel(KWSPI_IRQMASK, &spireg->irq_mask);
60
61#ifdef CONFIG_KIRKWOOD
62 /* program mpp registers to select SPI_CSn */
63 kirkwood_mpp_conf(kwspi_mpp_config[cs ? 1 : 0], cs_spi_mpp_back);
64#endif
65
66 return slave;
67}
68
69void spi_free_slave(struct spi_slave *slave)
70{
71#ifdef CONFIG_KIRKWOOD
72 kirkwood_mpp_conf(cs_spi_mpp_back, NULL);
73#endif
74 free(slave);
75}
76
77#if defined(CONFIG_SYS_KW_SPI_MPP)
78u32 spi_mpp_backup[4];
79#endif
80
81__attribute__((weak)) int board_spi_claim_bus(struct spi_slave *slave)
82{
83 return 0;
84}
85
86int spi_claim_bus(struct spi_slave *slave)
87{
88#if defined(CONFIG_SYS_KW_SPI_MPP)
89 u32 config;
90 u32 spi_mpp_config[4];
91
92 config = CONFIG_SYS_KW_SPI_MPP;
93
94 if (config & MOSI_MPP6)
95 spi_mpp_config[0] = MPP6_SPI_MOSI;
96 else
97 spi_mpp_config[0] = MPP1_SPI_MOSI;
98
99 if (config & SCK_MPP10)
100 spi_mpp_config[1] = MPP10_SPI_SCK;
101 else
102 spi_mpp_config[1] = MPP2_SPI_SCK;
103
104 if (config & MISO_MPP11)
105 spi_mpp_config[2] = MPP11_SPI_MISO;
106 else
107 spi_mpp_config[2] = MPP3_SPI_MISO;
108
109 spi_mpp_config[3] = 0;
110 spi_mpp_backup[3] = 0;
111
112 /* set new spi mpp and save current mpp config */
113 kirkwood_mpp_conf(spi_mpp_config, spi_mpp_backup);
114#endif
115
116 return board_spi_claim_bus(slave);
117}
118
119__attribute__((weak)) void board_spi_release_bus(struct spi_slave *slave)
120{
121}
122
123void spi_release_bus(struct spi_slave *slave)
124{
125#if defined(CONFIG_SYS_KW_SPI_MPP)
126 kirkwood_mpp_conf(spi_mpp_backup, NULL);
127#endif
128
129 board_spi_release_bus(slave);
130}
131
132#ifndef CONFIG_SPI_CS_IS_VALID
133/*
134 * you can define this function board specific
135 * define above CONFIG in board specific config file and
136 * provide the function in board specific src file
137 */
138int spi_cs_is_valid(unsigned int bus, unsigned int cs)
139{
140 return bus == 0 && (cs == 0 || cs == 1);
141}
142#endif
143
144void spi_init(void)
145{
146}
147
148void spi_cs_activate(struct spi_slave *slave)
149{
Googler695f9d92023-09-11 15:38:29 +0800150 setbits_le32(&spireg->ctrl, KWSPI_CSN_ACT);
Googlere00b8eb2019-07-08 16:37:07 -0700151}
152
153void spi_cs_deactivate(struct spi_slave *slave)
154{
Googler695f9d92023-09-11 15:38:29 +0800155 clrbits_le32(&spireg->ctrl, KWSPI_CSN_ACT);
Googlere00b8eb2019-07-08 16:37:07 -0700156}
157
Googler695f9d92023-09-11 15:38:29 +0800158int spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *dout,
159 void *din, unsigned long flags)
Googlere00b8eb2019-07-08 16:37:07 -0700160{
Googler695f9d92023-09-11 15:38:29 +0800161 unsigned int tmpdout, tmpdin;
162 int tm, isread = 0;
Googlere00b8eb2019-07-08 16:37:07 -0700163
Googler695f9d92023-09-11 15:38:29 +0800164 debug("spi_xfer: slave %u:%u dout %p din %p bitlen %u\n",
165 slave->bus, slave->cs, dout, din, bitlen);
Googlere00b8eb2019-07-08 16:37:07 -0700166
Googler695f9d92023-09-11 15:38:29 +0800167 if (flags & SPI_XFER_BEGIN)
168 spi_cs_activate(slave);
Googler25e92cf2023-12-13 10:05:01 +0000169
170 /*
Googler695f9d92023-09-11 15:38:29 +0800171 * handle data in 8-bit chunks
172 * TBD: 2byte xfer mode to be enabled
Googler25e92cf2023-12-13 10:05:01 +0000173 */
Googler695f9d92023-09-11 15:38:29 +0800174 clrsetbits_le32(&spireg->cfg, KWSPI_XFERLEN_MASK, KWSPI_XFERLEN_1BYTE);
Googler25e92cf2023-12-13 10:05:01 +0000175
Googler695f9d92023-09-11 15:38:29 +0800176 while (bitlen > 4) {
177 debug("loopstart bitlen %d\n", bitlen);
178 tmpdout = 0;
Googler25e92cf2023-12-13 10:05:01 +0000179
Googler695f9d92023-09-11 15:38:29 +0800180 /* Shift data so it's msb-justified */
181 if (dout)
182 tmpdout = *(u32 *)dout & 0xff;
Googler25e92cf2023-12-13 10:05:01 +0000183
Googler695f9d92023-09-11 15:38:29 +0800184 clrbits_le32(&spireg->irq_cause, KWSPI_SMEMRDIRQ);
185 writel(tmpdout, &spireg->dout); /* Write the data out */
186 debug("*** spi_xfer: ... %08x written, bitlen %d\n",
187 tmpdout, bitlen);
Googler25e92cf2023-12-13 10:05:01 +0000188
Googler695f9d92023-09-11 15:38:29 +0800189 /*
190 * Wait for SPI transmit to get out
191 * or time out (1 second = 1000 ms)
192 * The NE event must be read and cleared first
193 */
194 for (tm = 0, isread = 0; tm < KWSPI_TIMEOUT; ++tm) {
195 if (readl(&spireg->irq_cause) & KWSPI_SMEMRDIRQ) {
196 isread = 1;
197 tmpdin = readl(&spireg->din);
198 debug("spi_xfer: din %p..%08x read\n",
199 din, tmpdin);
Googler25e92cf2023-12-13 10:05:01 +0000200
Googler695f9d92023-09-11 15:38:29 +0800201 if (din) {
202 *((u8 *)din) = (u8)tmpdin;
203 din += 1;
204 }
205 if (dout)
206 dout += 1;
207 bitlen -= 8;
208 }
209 if (isread)
210 break;
211 }
212 if (tm >= KWSPI_TIMEOUT)
213 printf("*** spi_xfer: Time out during SPI transfer\n");
Googler25e92cf2023-12-13 10:05:01 +0000214
Googler695f9d92023-09-11 15:38:29 +0800215 debug("loopend bitlen %d\n", bitlen);
216 }
Googler25e92cf2023-12-13 10:05:01 +0000217
Googler695f9d92023-09-11 15:38:29 +0800218 if (flags & SPI_XFER_END)
219 spi_cs_deactivate(slave);
Googler25e92cf2023-12-13 10:05:01 +0000220
221 return 0;
222}