5 * Copyright (c) 2005-2008 Analog Devices Inc.
6 * Copyright (C) 2010 Thomas Chou <thomas@wytron.com.tw>
8 * SPDX-License-Identifier: GPL-2.0+
15 struct altera_spi_regs {
24 #define ALTERA_SPI_STATUS_ROE_MSK (1 << 3)
25 #define ALTERA_SPI_STATUS_TOE_MSK (1 << 4)
26 #define ALTERA_SPI_STATUS_TMT_MSK (1 << 5)
27 #define ALTERA_SPI_STATUS_TRDY_MSK (1 << 6)
28 #define ALTERA_SPI_STATUS_RRDY_MSK (1 << 7)
29 #define ALTERA_SPI_STATUS_E_MSK (1 << 8)
31 #define ALTERA_SPI_CONTROL_IROE_MSK (1 << 3)
32 #define ALTERA_SPI_CONTROL_ITOE_MSK (1 << 4)
33 #define ALTERA_SPI_CONTROL_ITRDY_MSK (1 << 6)
34 #define ALTERA_SPI_CONTROL_IRRDY_MSK (1 << 7)
35 #define ALTERA_SPI_CONTROL_IE_MSK (1 << 8)
36 #define ALTERA_SPI_CONTROL_SSO_MSK (1 << 10)
38 #ifndef CONFIG_SYS_ALTERA_SPI_LIST
39 #define CONFIG_SYS_ALTERA_SPI_LIST { CONFIG_SYS_SPI_BASE }
42 static ulong altera_spi_base_list[] = CONFIG_SYS_ALTERA_SPI_LIST;
44 struct altera_spi_slave {
45 struct spi_slave slave;
46 struct altera_spi_regs *regs;
48 #define to_altera_spi_slave(s) container_of(s, struct altera_spi_slave, slave)
50 __weak int spi_cs_is_valid(unsigned int bus, unsigned int cs)
52 return bus < ARRAY_SIZE(altera_spi_base_list) && cs < 32;
55 __weak void spi_cs_activate(struct spi_slave *slave)
57 struct altera_spi_slave *altspi = to_altera_spi_slave(slave);
58 writel(1 << slave->cs, &altspi->regs->slave_sel);
59 writel(ALTERA_SPI_CONTROL_SSO_MSK, &altspi->regs->control);
62 __weak void spi_cs_deactivate(struct spi_slave *slave)
64 struct altera_spi_slave *altspi = to_altera_spi_slave(slave);
65 writel(0, &altspi->regs->control);
66 writel(0, &altspi->regs->slave_sel);
73 void spi_set_speed(struct spi_slave *slave, uint hz)
75 /* altera spi core does not support programmable speed */
78 struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs,
79 unsigned int max_hz, unsigned int mode)
81 struct altera_spi_slave *altspi;
83 if (!spi_cs_is_valid(bus, cs))
86 altspi = spi_alloc_slave(struct altera_spi_slave, bus, cs);
90 altspi->regs = (struct altera_spi_regs *)altera_spi_base_list[bus];
91 debug("%s: bus:%i cs:%i base:%p\n", __func__, bus, cs, altspi->regs);
93 return &altspi->slave;
96 void spi_free_slave(struct spi_slave *slave)
98 struct altera_spi_slave *altspi = to_altera_spi_slave(slave);
102 int spi_claim_bus(struct spi_slave *slave)
104 struct altera_spi_slave *altspi = to_altera_spi_slave(slave);
106 debug("%s: bus:%i cs:%i\n", __func__, slave->bus, slave->cs);
107 writel(0, &altspi->regs->control);
108 writel(0, &altspi->regs->slave_sel);
112 void spi_release_bus(struct spi_slave *slave)
114 struct altera_spi_slave *altspi = to_altera_spi_slave(slave);
116 debug("%s: bus:%i cs:%i\n", __func__, slave->bus, slave->cs);
117 writel(0, &altspi->regs->slave_sel);
120 #ifndef CONFIG_ALTERA_SPI_IDLE_VAL
121 # define CONFIG_ALTERA_SPI_IDLE_VAL 0xff
124 int spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *dout,
125 void *din, unsigned long flags)
127 struct altera_spi_slave *altspi = to_altera_spi_slave(slave);
128 /* assume spi core configured to do 8 bit transfers */
129 uint bytes = bitlen / 8;
130 const uchar *txp = dout;
133 debug("%s: bus:%i cs:%i bitlen:%i bytes:%i flags:%lx\n", __func__,
134 slave->bus, slave->cs, bitlen, bytes, flags);
140 flags |= SPI_XFER_END;
144 /* empty read buffer */
145 if (readl(&altspi->regs->status) & ALTERA_SPI_STATUS_RRDY_MSK)
146 readl(&altspi->regs->rxdata);
148 if (flags & SPI_XFER_BEGIN)
149 spi_cs_activate(slave);
152 uchar d = txp ? *txp++ : CONFIG_ALTERA_SPI_IDLE_VAL;
154 debug("%s: tx:%x ", __func__, d);
155 writel(d, &altspi->regs->txdata);
157 while (!(readl(&altspi->regs->status) & ALTERA_SPI_STATUS_RRDY_MSK))
160 d = readl(&altspi->regs->rxdata);
168 if (flags & SPI_XFER_END)
169 spi_cs_deactivate(slave);