4 * XPS/AXI bus interface
6 * based on bfin_spi.c, by way of altera_spi.c
7 * Copyright (c) 2005-2008 Analog Devices Inc.
8 * Copyright (c) 2010 Thomas Chou <thomas@wytron.com.tw>
9 * Copyright (c) 2010 Graeme Smecher <graeme.smecher@mail.mcgill.ca>
10 * Copyright (c) 2012 Stephan Linz <linz@li-pro.net>
12 * Licensed under the GPL-2 or later.
14 * [0]: http://www.xilinx.com/support/documentation
16 * [S]: [0]/ip_documentation/xps_spi.pdf
17 * [0]/ip_documentation/axi_spi_ds742.pdf
22 #include <asm/types.h>
26 * Xilinx SPI Register Definition
28 * [1]: [0]/ip_documentation/xps_spi.pdf
29 * page 8, Register Descriptions
30 * [2]: [0]/ip_documentation/axi_spi_ds742.pdf
31 * page 7, Register Overview Table
33 struct xilinx_spi_reg {
35 u32 dgier; /* Device Global Interrupt Enable Register (DGIER) */
36 u32 ipisr; /* IP Interrupt Status Register (IPISR) */
38 u32 ipier; /* IP Interrupt Enable Register (IPIER) */
40 u32 srr; /* Softare Reset Register (SRR) */
42 u32 spicr; /* SPI Control Register (SPICR) */
43 u32 spisr; /* SPI Status Register (SPISR) */
44 u32 spidtr; /* SPI Data Transmit Register (SPIDTR) */
45 u32 spidrr; /* SPI Data Receive Register (SPIDRR) */
46 u32 spissr; /* SPI Slave Select Register (SPISSR) */
47 u32 spitfor; /* SPI Transmit FIFO Occupancy Register (SPITFOR) */
48 u32 spirfor; /* SPI Receive FIFO Occupancy Register (SPIRFOR) */
51 /* Device Global Interrupt Enable Register (dgier), [1] p15, [2] p15 */
52 #define DGIER_GIE (1 << 31)
54 /* IP Interrupt Status Register (ipisr), [1] p15, [2] p15 */
55 #define IPISR_DRR_NOT_EMPTY (1 << 8)
56 #define IPISR_SLAVE_SELECT (1 << 7)
57 #define IPISR_TXF_HALF_EMPTY (1 << 6)
58 #define IPISR_DRR_OVERRUN (1 << 5)
59 #define IPISR_DRR_FULL (1 << 4)
60 #define IPISR_DTR_UNDERRUN (1 << 3)
61 #define IPISR_DTR_EMPTY (1 << 2)
62 #define IPISR_SLAVE_MODF (1 << 1)
63 #define IPISR_MODF (1 << 0)
65 /* IP Interrupt Enable Register (ipier), [1] p17, [2] p18 */
66 #define IPIER_DRR_NOT_EMPTY (1 << 8)
67 #define IPIER_SLAVE_SELECT (1 << 7)
68 #define IPIER_TXF_HALF_EMPTY (1 << 6)
69 #define IPIER_DRR_OVERRUN (1 << 5)
70 #define IPIER_DRR_FULL (1 << 4)
71 #define IPIER_DTR_UNDERRUN (1 << 3)
72 #define IPIER_DTR_EMPTY (1 << 2)
73 #define IPIER_SLAVE_MODF (1 << 1)
74 #define IPIER_MODF (1 << 0)
76 /* Softare Reset Register (srr), [1] p9, [2] p8 */
77 #define SRR_RESET_CODE 0x0000000A
79 /* SPI Control Register (spicr), [1] p9, [2] p8 */
80 #define SPICR_LSB_FIRST (1 << 9)
81 #define SPICR_MASTER_INHIBIT (1 << 8)
82 #define SPICR_MANUAL_SS (1 << 7)
83 #define SPICR_RXFIFO_RESEST (1 << 6)
84 #define SPICR_TXFIFO_RESEST (1 << 5)
85 #define SPICR_CPHA (1 << 4)
86 #define SPICR_CPOL (1 << 3)
87 #define SPICR_MASTER_MODE (1 << 2)
88 #define SPICR_SPE (1 << 1)
89 #define SPICR_LOOP (1 << 0)
91 /* SPI Status Register (spisr), [1] p11, [2] p10 */
92 #define SPISR_SLAVE_MODE_SELECT (1 << 5)
93 #define SPISR_MODF (1 << 4)
94 #define SPISR_TX_FULL (1 << 3)
95 #define SPISR_TX_EMPTY (1 << 2)
96 #define SPISR_RX_FULL (1 << 1)
97 #define SPISR_RX_EMPTY (1 << 0)
99 /* SPI Data Transmit Register (spidtr), [1] p12, [2] p12 */
100 #define SPIDTR_8BIT_MASK (0xff << 0)
101 #define SPIDTR_16BIT_MASK (0xffff << 0)
102 #define SPIDTR_32BIT_MASK (0xffffffff << 0)
104 /* SPI Data Receive Register (spidrr), [1] p12, [2] p12 */
105 #define SPIDRR_8BIT_MASK (0xff << 0)
106 #define SPIDRR_16BIT_MASK (0xffff << 0)
107 #define SPIDRR_32BIT_MASK (0xffffffff << 0)
109 /* SPI Slave Select Register (spissr), [1] p13, [2] p13 */
110 #define SPISSR_MASK(cs) (1 << (cs))
111 #define SPISSR_ACT(cs) ~SPISSR_MASK(cs)
112 #define SPISSR_OFF ~0UL
114 /* SPI Transmit FIFO Occupancy Register (spitfor), [1] p13, [2] p14 */
115 #define SPITFOR_OCYVAL_POS 0
116 #define SPITFOR_OCYVAL_MASK (0xf << SPITFOR_OCYVAL_POS)
118 /* SPI Receive FIFO Occupancy Register (spirfor), [1] p14, [2] p14 */
119 #define SPIRFOR_OCYVAL_POS 0
120 #define SPIRFOR_OCYVAL_MASK (0xf << SPIRFOR_OCYVAL_POS)
122 /* SPI Software Reset Register (ssr) */
123 #define SPISSR_RESET_VALUE 0x0a
125 struct xilinx_spi_slave {
126 struct spi_slave slave;
127 struct xilinx_spi_reg *regs;
132 static inline struct xilinx_spi_slave *to_xilinx_spi_slave(
133 struct spi_slave *slave)
135 return container_of(slave, struct xilinx_spi_slave, slave);
138 #endif /* _XILINX_SPI_ */