]>
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/kirkwood.h>
16 #include <asm/arch/spi.h>
17 #include <asm/arch/mpp.h>
19 static struct kwspi_registers
*spireg
= (struct kwspi_registers
*)KW_SPI_BASE
;
21 static u32 cs_spi_mpp_back
[2];
23 struct spi_slave
*spi_setup_slave(unsigned int bus
, unsigned int cs
,
24 unsigned int max_hz
, unsigned int mode
)
26 struct spi_slave
*slave
;
28 static const u32 kwspi_mpp_config
[2][2] = {
29 { MPP0_SPI_SCn
, 0 }, /* if cs == 0 */
30 { MPP7_SPI_SCn
, 0 } /* if cs != 0 */
33 if (!spi_cs_is_valid(bus
, cs
))
36 slave
= spi_alloc_slave_base(bus
, cs
);
40 writel(KWSPI_SMEMRDY
, &spireg
->ctrl
);
42 /* calculate spi clock prescaller using max_hz */
43 data
= ((CONFIG_SYS_TCLK
/ 2) / max_hz
) + 0x10;
44 data
= data
< KWSPI_CLKPRESCL_MIN
? KWSPI_CLKPRESCL_MIN
: data
;
45 data
= data
> KWSPI_CLKPRESCL_MASK
? KWSPI_CLKPRESCL_MASK
: data
;
47 /* program spi clock prescaller using max_hz */
48 writel(KWSPI_ADRLEN_3BYTE
| data
, &spireg
->cfg
);
49 debug("data = 0x%08x\n", data
);
51 writel(KWSPI_SMEMRDIRQ
, &spireg
->irq_cause
);
52 writel(KWSPI_IRQMASK
, &spireg
->irq_mask
);
54 /* program mpp registers to select SPI_CSn */
55 kirkwood_mpp_conf(kwspi_mpp_config
[cs
? 1 : 0], cs_spi_mpp_back
);
60 void spi_free_slave(struct spi_slave
*slave
)
62 kirkwood_mpp_conf(cs_spi_mpp_back
, NULL
);
66 #if defined(CONFIG_SYS_KW_SPI_MPP)
67 u32 spi_mpp_backup
[4];
70 __attribute__((weak
)) int board_spi_claim_bus(struct spi_slave
*slave
)
75 int spi_claim_bus(struct spi_slave
*slave
)
77 #if defined(CONFIG_SYS_KW_SPI_MPP)
79 u32 spi_mpp_config
[4];
81 config
= CONFIG_SYS_KW_SPI_MPP
;
83 if (config
& MOSI_MPP6
)
84 spi_mpp_config
[0] = MPP6_SPI_MOSI
;
86 spi_mpp_config
[0] = MPP1_SPI_MOSI
;
88 if (config
& SCK_MPP10
)
89 spi_mpp_config
[1] = MPP10_SPI_SCK
;
91 spi_mpp_config
[1] = MPP2_SPI_SCK
;
93 if (config
& MISO_MPP11
)
94 spi_mpp_config
[2] = MPP11_SPI_MISO
;
96 spi_mpp_config
[2] = MPP3_SPI_MISO
;
98 spi_mpp_config
[3] = 0;
99 spi_mpp_backup
[3] = 0;
101 /* set new spi mpp and save current mpp config */
102 kirkwood_mpp_conf(spi_mpp_config
, spi_mpp_backup
);
105 return board_spi_claim_bus(slave
);
108 __attribute__((weak
)) void board_spi_release_bus(struct spi_slave
*slave
)
112 void spi_release_bus(struct spi_slave
*slave
)
114 #if defined(CONFIG_SYS_KW_SPI_MPP)
115 kirkwood_mpp_conf(spi_mpp_backup
, NULL
);
118 board_spi_release_bus(slave
);
121 #ifndef CONFIG_SPI_CS_IS_VALID
123 * you can define this function board specific
124 * define above CONFIG in board specific config file and
125 * provide the function in board specific src file
127 int spi_cs_is_valid(unsigned int bus
, unsigned int cs
)
129 return bus
== 0 && (cs
== 0 || cs
== 1);
137 void spi_cs_activate(struct spi_slave
*slave
)
139 setbits_le32(&spireg
->ctrl
, KWSPI_CSN_ACT
);
142 void spi_cs_deactivate(struct spi_slave
*slave
)
144 clrbits_le32(&spireg
->ctrl
, KWSPI_CSN_ACT
);
147 int spi_xfer(struct spi_slave
*slave
, unsigned int bitlen
, const void *dout
,
148 void *din
, unsigned long flags
)
150 unsigned int tmpdout
, tmpdin
;
153 debug("spi_xfer: slave %u:%u dout %p din %p bitlen %u\n",
154 slave
->bus
, slave
->cs
, dout
, din
, bitlen
);
156 if (flags
& SPI_XFER_BEGIN
)
157 spi_cs_activate(slave
);
160 * handle data in 8-bit chunks
161 * TBD: 2byte xfer mode to be enabled
163 clrsetbits_le32(&spireg
->cfg
, KWSPI_XFERLEN_MASK
, KWSPI_XFERLEN_1BYTE
);
166 debug("loopstart bitlen %d\n", bitlen
);
169 /* Shift data so it's msb-justified */
171 tmpdout
= *(u32
*)dout
& 0xff;
173 clrbits_le32(&spireg
->irq_cause
, KWSPI_SMEMRDIRQ
);
174 writel(tmpdout
, &spireg
->dout
); /* Write the data out */
175 debug("*** spi_xfer: ... %08x written, bitlen %d\n",
179 * Wait for SPI transmit to get out
180 * or time out (1 second = 1000 ms)
181 * The NE event must be read and cleared first
183 for (tm
= 0, isread
= 0; tm
< KWSPI_TIMEOUT
; ++tm
) {
184 if (readl(&spireg
->irq_cause
) & KWSPI_SMEMRDIRQ
) {
186 tmpdin
= readl(&spireg
->din
);
187 debug("spi_xfer: din %p..%08x read\n",
191 *((u8
*)din
) = (u8
)tmpdin
;
201 if (tm
>= KWSPI_TIMEOUT
)
202 printf("*** spi_xfer: Time out during SPI transfer\n");
204 debug("loopend bitlen %d\n", bitlen
);
207 if (flags
& SPI_XFER_END
)
208 spi_cs_deactivate(slave
);