]>
git.ipfire.org Git - people/ms/u-boot.git/blob - drivers/spi/kirkwood_spi.c
3 * Marvell Semiconductor <www.marvell.com>
4 * Written-by: Prafulla Wadaskar <prafulla@marvell.com>
6 * Derived from drivers/spi/mpc8xxx_spi.c
8 * SPDX-License-Identifier: GPL-2.0+
15 #include <asm/arch/soc.h>
16 #ifdef CONFIG_KIRKWOOD
17 #include <asm/arch/mpp.h>
19 #include <asm/arch-mvebu/spi.h>
21 static struct kwspi_registers
*spireg
=
22 (struct kwspi_registers
*)MVEBU_SPI_BASE
;
24 #ifdef CONFIG_KIRKWOOD
25 static u32 cs_spi_mpp_back
[2];
28 struct spi_slave
*spi_setup_slave(unsigned int bus
, unsigned int cs
,
29 unsigned int max_hz
, unsigned int mode
)
31 struct spi_slave
*slave
;
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 */
40 if (!spi_cs_is_valid(bus
, cs
))
43 slave
= spi_alloc_slave_base(bus
, cs
);
47 writel(KWSPI_SMEMRDY
, &spireg
->ctrl
);
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
;
54 /* program spi clock prescaller using max_hz */
55 writel(KWSPI_ADRLEN_3BYTE
| data
, &spireg
->cfg
);
56 debug("data = 0x%08x\n", data
);
58 writel(KWSPI_SMEMRDIRQ
, &spireg
->irq_cause
);
59 writel(KWSPI_IRQMASK
, &spireg
->irq_mask
);
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
);
69 void spi_free_slave(struct spi_slave
*slave
)
71 #ifdef CONFIG_KIRKWOOD
72 kirkwood_mpp_conf(cs_spi_mpp_back
, NULL
);
77 #if defined(CONFIG_SYS_KW_SPI_MPP)
78 u32 spi_mpp_backup
[4];
81 __attribute__((weak
)) int board_spi_claim_bus(struct spi_slave
*slave
)
86 int spi_claim_bus(struct spi_slave
*slave
)
88 #if defined(CONFIG_SYS_KW_SPI_MPP)
90 u32 spi_mpp_config
[4];
92 config
= CONFIG_SYS_KW_SPI_MPP
;
94 if (config
& MOSI_MPP6
)
95 spi_mpp_config
[0] = MPP6_SPI_MOSI
;
97 spi_mpp_config
[0] = MPP1_SPI_MOSI
;
99 if (config
& SCK_MPP10
)
100 spi_mpp_config
[1] = MPP10_SPI_SCK
;
102 spi_mpp_config
[1] = MPP2_SPI_SCK
;
104 if (config
& MISO_MPP11
)
105 spi_mpp_config
[2] = MPP11_SPI_MISO
;
107 spi_mpp_config
[2] = MPP3_SPI_MISO
;
109 spi_mpp_config
[3] = 0;
110 spi_mpp_backup
[3] = 0;
112 /* set new spi mpp and save current mpp config */
113 kirkwood_mpp_conf(spi_mpp_config
, spi_mpp_backup
);
116 return board_spi_claim_bus(slave
);
119 __attribute__((weak
)) void board_spi_release_bus(struct spi_slave
*slave
)
123 void spi_release_bus(struct spi_slave
*slave
)
125 #if defined(CONFIG_SYS_KW_SPI_MPP)
126 kirkwood_mpp_conf(spi_mpp_backup
, NULL
);
129 board_spi_release_bus(slave
);
132 #ifndef CONFIG_SPI_CS_IS_VALID
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
138 int spi_cs_is_valid(unsigned int bus
, unsigned int cs
)
140 return bus
== 0 && (cs
== 0 || cs
== 1);
148 void spi_cs_activate(struct spi_slave
*slave
)
150 setbits_le32(&spireg
->ctrl
, KWSPI_CSN_ACT
);
153 void spi_cs_deactivate(struct spi_slave
*slave
)
155 clrbits_le32(&spireg
->ctrl
, KWSPI_CSN_ACT
);
158 int spi_xfer(struct spi_slave
*slave
, unsigned int bitlen
, const void *dout
,
159 void *din
, unsigned long flags
)
161 unsigned int tmpdout
, tmpdin
;
164 debug("spi_xfer: slave %u:%u dout %p din %p bitlen %u\n",
165 slave
->bus
, slave
->cs
, dout
, din
, bitlen
);
167 if (flags
& SPI_XFER_BEGIN
)
168 spi_cs_activate(slave
);
171 * handle data in 8-bit chunks
172 * TBD: 2byte xfer mode to be enabled
174 clrsetbits_le32(&spireg
->cfg
, KWSPI_XFERLEN_MASK
, KWSPI_XFERLEN_1BYTE
);
177 debug("loopstart bitlen %d\n", bitlen
);
180 /* Shift data so it's msb-justified */
182 tmpdout
= *(u32
*)dout
& 0xff;
184 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",
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
194 for (tm
= 0, isread
= 0; tm
< KWSPI_TIMEOUT
; ++tm
) {
195 if (readl(&spireg
->irq_cause
) & KWSPI_SMEMRDIRQ
) {
197 tmpdin
= readl(&spireg
->din
);
198 debug("spi_xfer: din %p..%08x read\n",
202 *((u8
*)din
) = (u8
)tmpdin
;
212 if (tm
>= KWSPI_TIMEOUT
)
213 printf("*** spi_xfer: Time out during SPI transfer\n");
215 debug("loopend bitlen %d\n", bitlen
);
218 if (flags
& SPI_XFER_END
)
219 spi_cs_deactivate(slave
);