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 = (struct kwspi_registers *)KW_SPI_BASE;
23 #ifdef CONFIG_KIRKWOOD
24 static u32 cs_spi_mpp_back[2];
27 struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs,
28 unsigned int max_hz, unsigned int mode)
30 struct spi_slave *slave;
32 #ifdef CONFIG_KIRKWOOD
33 static const u32 kwspi_mpp_config[2][2] = {
34 { MPP0_SPI_SCn, 0 }, /* if cs == 0 */
35 { MPP7_SPI_SCn, 0 } /* if cs != 0 */
39 if (!spi_cs_is_valid(bus, cs))
42 slave = spi_alloc_slave_base(bus, cs);
46 writel(KWSPI_SMEMRDY, &spireg->ctrl);
48 /* calculate spi clock prescaller using max_hz */
49 data = ((CONFIG_SYS_TCLK / 2) / max_hz) + 0x10;
50 data = data < KWSPI_CLKPRESCL_MIN ? KWSPI_CLKPRESCL_MIN : data;
51 data = data > KWSPI_CLKPRESCL_MASK ? KWSPI_CLKPRESCL_MASK : data;
53 /* program spi clock prescaller using max_hz */
54 writel(KWSPI_ADRLEN_3BYTE | data, &spireg->cfg);
55 debug("data = 0x%08x\n", data);
57 writel(KWSPI_SMEMRDIRQ, &spireg->irq_cause);
58 writel(KWSPI_IRQMASK, &spireg->irq_mask);
60 #ifdef CONFIG_KIRKWOOD
61 /* program mpp registers to select SPI_CSn */
62 kirkwood_mpp_conf(kwspi_mpp_config[cs ? 1 : 0], cs_spi_mpp_back);
68 void spi_free_slave(struct spi_slave *slave)
70 #ifdef CONFIG_KIRKWOOD
71 kirkwood_mpp_conf(cs_spi_mpp_back, NULL);
76 #if defined(CONFIG_SYS_KW_SPI_MPP)
77 u32 spi_mpp_backup[4];
80 __attribute__((weak)) int board_spi_claim_bus(struct spi_slave *slave)
85 int spi_claim_bus(struct spi_slave *slave)
87 #if defined(CONFIG_SYS_KW_SPI_MPP)
89 u32 spi_mpp_config[4];
91 config = CONFIG_SYS_KW_SPI_MPP;
93 if (config & MOSI_MPP6)
94 spi_mpp_config[0] = MPP6_SPI_MOSI;
96 spi_mpp_config[0] = MPP1_SPI_MOSI;
98 if (config & SCK_MPP10)
99 spi_mpp_config[1] = MPP10_SPI_SCK;
101 spi_mpp_config[1] = MPP2_SPI_SCK;
103 if (config & MISO_MPP11)
104 spi_mpp_config[2] = MPP11_SPI_MISO;
106 spi_mpp_config[2] = MPP3_SPI_MISO;
108 spi_mpp_config[3] = 0;
109 spi_mpp_backup[3] = 0;
111 /* set new spi mpp and save current mpp config */
112 kirkwood_mpp_conf(spi_mpp_config, spi_mpp_backup);
115 return board_spi_claim_bus(slave);
118 __attribute__((weak)) void board_spi_release_bus(struct spi_slave *slave)
122 void spi_release_bus(struct spi_slave *slave)
124 #if defined(CONFIG_SYS_KW_SPI_MPP)
125 kirkwood_mpp_conf(spi_mpp_backup, NULL);
128 board_spi_release_bus(slave);
131 #ifndef CONFIG_SPI_CS_IS_VALID
133 * you can define this function board specific
134 * define above CONFIG in board specific config file and
135 * provide the function in board specific src file
137 int spi_cs_is_valid(unsigned int bus, unsigned int cs)
139 return bus == 0 && (cs == 0 || cs == 1);
147 void spi_cs_activate(struct spi_slave *slave)
149 setbits_le32(&spireg->ctrl, KWSPI_CSN_ACT);
152 void spi_cs_deactivate(struct spi_slave *slave)
154 clrbits_le32(&spireg->ctrl, KWSPI_CSN_ACT);
157 int spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *dout,
158 void *din, unsigned long flags)
160 unsigned int tmpdout, tmpdin;
163 debug("spi_xfer: slave %u:%u dout %p din %p bitlen %u\n",
164 slave->bus, slave->cs, dout, din, bitlen);
166 if (flags & SPI_XFER_BEGIN)
167 spi_cs_activate(slave);
170 * handle data in 8-bit chunks
171 * TBD: 2byte xfer mode to be enabled
173 clrsetbits_le32(&spireg->cfg, KWSPI_XFERLEN_MASK, KWSPI_XFERLEN_1BYTE);
176 debug("loopstart bitlen %d\n", bitlen);
179 /* Shift data so it's msb-justified */
181 tmpdout = *(u32 *)dout & 0xff;
183 clrbits_le32(&spireg->irq_cause, KWSPI_SMEMRDIRQ);
184 writel(tmpdout, &spireg->dout); /* Write the data out */
185 debug("*** spi_xfer: ... %08x written, bitlen %d\n",
189 * Wait for SPI transmit to get out
190 * or time out (1 second = 1000 ms)
191 * The NE event must be read and cleared first
193 for (tm = 0, isread = 0; tm < KWSPI_TIMEOUT; ++tm) {
194 if (readl(&spireg->irq_cause) & KWSPI_SMEMRDIRQ) {
196 tmpdin = readl(&spireg->din);
197 debug("spi_xfer: din %p..%08x read\n",
201 *((u8 *)din) = (u8)tmpdin;
211 if (tm >= KWSPI_TIMEOUT)
212 printf("*** spi_xfer: Time out during SPI transfer\n");
214 debug("loopend bitlen %d\n", bitlen);
217 if (flags & SPI_XFER_END)
218 spi_cs_deactivate(slave);