3 * Marvell Semiconductor <www.marvell.com>
4 * Written-by: Prafulla Wadaskar <prafulla@marvell.com>
6 * Derived from drivers/spi/mpc8xxx_spi.c
8 * See file CREDITS for list of people who contributed to this
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License as
13 * published by the Free Software Foundation; either version 2 of
14 * the License, or (at your option) any later version.
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
31 #include <asm/arch/kirkwood.h>
32 #include <asm/arch/spi.h>
33 #include <asm/arch/mpp.h>
35 static struct kwspi_registers *spireg = (struct kwspi_registers *)KW_SPI_BASE;
37 u32 cs_spi_mpp_back[2];
39 struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs,
40 unsigned int max_hz, unsigned int mode)
42 struct spi_slave *slave;
44 u32 kwspi_mpp_config[] = { 0, 0 };
46 if (!spi_cs_is_valid(bus, cs))
49 slave = malloc(sizeof(struct spi_slave));
56 writel(~KWSPI_CSN_ACT | KWSPI_SMEMRDY, &spireg->ctrl);
58 /* calculate spi clock prescaller using max_hz */
59 data = ((CONFIG_SYS_TCLK / 2) / max_hz) & KWSPI_CLKPRESCL_MASK;
62 /* program spi clock prescaller using max_hz */
63 writel(KWSPI_ADRLEN_3BYTE | data, &spireg->cfg);
64 debug("data = 0x%08x \n", data);
66 writel(KWSPI_SMEMRDIRQ, &spireg->irq_cause);
67 writel(KWSPI_IRQMASK, &spireg->irq_mask);
69 /* program mpp registers to select SPI_CSn */
71 kwspi_mpp_config[0] = MPP7_SPI_SCn;
73 kwspi_mpp_config[0] = MPP0_SPI_SCn;
75 kirkwood_mpp_conf(kwspi_mpp_config, cs_spi_mpp_back);
80 void spi_free_slave(struct spi_slave *slave)
82 kirkwood_mpp_conf(cs_spi_mpp_back, NULL);
86 #if defined(CONFIG_SYS_KW_SPI_MPP)
87 u32 spi_mpp_backup[4];
90 __attribute__((weak)) int board_spi_claim_bus(struct spi_slave *slave)
95 int spi_claim_bus(struct spi_slave *slave)
97 #if defined(CONFIG_SYS_KW_SPI_MPP)
99 u32 spi_mpp_config[4];
101 config = CONFIG_SYS_KW_SPI_MPP;
103 if (config & MOSI_MPP6)
104 spi_mpp_config[0] = MPP6_SPI_MOSI;
106 spi_mpp_config[0] = MPP1_SPI_MOSI;
108 if (config & SCK_MPP10)
109 spi_mpp_config[1] = MPP10_SPI_SCK;
111 spi_mpp_config[1] = MPP2_SPI_SCK;
113 if (config & MISO_MPP11)
114 spi_mpp_config[2] = MPP11_SPI_MISO;
116 spi_mpp_config[2] = MPP3_SPI_MISO;
118 spi_mpp_config[3] = 0;
119 spi_mpp_backup[3] = 0;
121 /* set new spi mpp and save current mpp config */
122 kirkwood_mpp_conf(spi_mpp_config, spi_mpp_backup);
126 return board_spi_claim_bus(slave);
129 __attribute__((weak)) void board_spi_release_bus(struct spi_slave *slave)
133 void spi_release_bus(struct spi_slave *slave)
135 #if defined(CONFIG_SYS_KW_SPI_MPP)
136 kirkwood_mpp_conf(spi_mpp_backup, NULL);
139 board_spi_release_bus(slave);
142 #ifndef CONFIG_SPI_CS_IS_VALID
144 * you can define this function board specific
145 * define above CONFIG in board specific config file and
146 * provide the function in board specific src file
148 int spi_cs_is_valid(unsigned int bus, unsigned int cs)
150 return (bus == 0 && (cs == 0 || cs == 1));
158 void spi_cs_activate(struct spi_slave *slave)
160 writel(readl(&spireg->ctrl) | KWSPI_IRQUNMASK, &spireg->ctrl);
163 void spi_cs_deactivate(struct spi_slave *slave)
165 writel(readl(&spireg->ctrl) & KWSPI_IRQMASK, &spireg->ctrl);
168 int spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *dout,
169 void *din, unsigned long flags)
171 unsigned int tmpdout, tmpdin;
174 debug("spi_xfer: slave %u:%u dout %p din %p bitlen %u\n",
175 slave->bus, slave->cs, dout, din, bitlen);
177 if (flags & SPI_XFER_BEGIN)
178 spi_cs_activate(slave);
181 * handle data in 8-bit chunks
182 * TBD: 2byte xfer mode to be enabled
184 writel(((readl(&spireg->cfg) & ~KWSPI_XFERLEN_MASK) |
185 KWSPI_XFERLEN_1BYTE), &spireg->cfg);
188 debug("loopstart bitlen %d\n", bitlen);
191 /* Shift data so it's msb-justified */
193 tmpdout = *(u32 *) dout & 0x0ff;
195 writel(~KWSPI_SMEMRDIRQ, &spireg->irq_cause);
196 writel(tmpdout, &spireg->dout); /* Write the data out */
197 debug("*** spi_xfer: ... %08x written, bitlen %d\n",
201 * Wait for SPI transmit to get out
202 * or time out (1 second = 1000 ms)
203 * The NE event must be read and cleared first
205 for (tm = 0, isread = 0; tm < KWSPI_TIMEOUT; ++tm) {
206 if (readl(&spireg->irq_cause) & KWSPI_SMEMRDIRQ) {
208 tmpdin = readl(&spireg->din);
210 ("spi_xfer: din %p..%08x read\n",
214 *((u8 *) din) = (u8) tmpdin;
224 if (tm >= KWSPI_TIMEOUT)
225 printf("*** spi_xfer: Time out during SPI transfer\n");
227 debug("loopend bitlen %d\n", bitlen);
230 if (flags & SPI_XFER_END)
231 spi_cs_deactivate(slave);