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f2d7047948
Add support for a new devicetree compatible string called 'amazon,alpine-apb-ssi', which is necessary for the Amazon Alpine spi controller. 'amazon,alpine-dw-apb-ssi' is used in the dw spi driver if specified in the devicetree. Otherwise, fall back to driver default behavior, i.e. original dw IP hw driver behavior. Signed-off-by: Talel Shenhar <talel@amazon.com> Signed-off-by: David Woodhouse <dwmw@amazon.co.uk> Signed-off-by: Mark Brown <broonie@kernel.org>
258 lines
6.3 KiB
C
258 lines
6.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef DW_SPI_HEADER_H
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#define DW_SPI_HEADER_H
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#include <linux/io.h>
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#include <linux/scatterlist.h>
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#include <linux/gpio.h>
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/* Register offsets */
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#define DW_SPI_CTRL0 0x00
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#define DW_SPI_CTRL1 0x04
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#define DW_SPI_SSIENR 0x08
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#define DW_SPI_MWCR 0x0c
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#define DW_SPI_SER 0x10
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#define DW_SPI_BAUDR 0x14
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#define DW_SPI_TXFLTR 0x18
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#define DW_SPI_RXFLTR 0x1c
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#define DW_SPI_TXFLR 0x20
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#define DW_SPI_RXFLR 0x24
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#define DW_SPI_SR 0x28
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#define DW_SPI_IMR 0x2c
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#define DW_SPI_ISR 0x30
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#define DW_SPI_RISR 0x34
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#define DW_SPI_TXOICR 0x38
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#define DW_SPI_RXOICR 0x3c
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#define DW_SPI_RXUICR 0x40
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#define DW_SPI_MSTICR 0x44
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#define DW_SPI_ICR 0x48
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#define DW_SPI_DMACR 0x4c
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#define DW_SPI_DMATDLR 0x50
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#define DW_SPI_DMARDLR 0x54
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#define DW_SPI_IDR 0x58
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#define DW_SPI_VERSION 0x5c
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#define DW_SPI_DR 0x60
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#define DW_SPI_CS_OVERRIDE 0xf4
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/* Bit fields in CTRLR0 */
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#define SPI_DFS_OFFSET 0
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#define SPI_FRF_OFFSET 4
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#define SPI_FRF_SPI 0x0
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#define SPI_FRF_SSP 0x1
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#define SPI_FRF_MICROWIRE 0x2
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#define SPI_FRF_RESV 0x3
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#define SPI_MODE_OFFSET 6
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#define SPI_SCPH_OFFSET 6
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#define SPI_SCOL_OFFSET 7
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#define SPI_TMOD_OFFSET 8
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#define SPI_TMOD_MASK (0x3 << SPI_TMOD_OFFSET)
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#define SPI_TMOD_TR 0x0 /* xmit & recv */
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#define SPI_TMOD_TO 0x1 /* xmit only */
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#define SPI_TMOD_RO 0x2 /* recv only */
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#define SPI_TMOD_EPROMREAD 0x3 /* eeprom read mode */
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#define SPI_SLVOE_OFFSET 10
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#define SPI_SRL_OFFSET 11
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#define SPI_CFS_OFFSET 12
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/* Bit fields in SR, 7 bits */
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#define SR_MASK 0x7f /* cover 7 bits */
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#define SR_BUSY (1 << 0)
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#define SR_TF_NOT_FULL (1 << 1)
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#define SR_TF_EMPT (1 << 2)
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#define SR_RF_NOT_EMPT (1 << 3)
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#define SR_RF_FULL (1 << 4)
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#define SR_TX_ERR (1 << 5)
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#define SR_DCOL (1 << 6)
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/* Bit fields in ISR, IMR, RISR, 7 bits */
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#define SPI_INT_TXEI (1 << 0)
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#define SPI_INT_TXOI (1 << 1)
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#define SPI_INT_RXUI (1 << 2)
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#define SPI_INT_RXOI (1 << 3)
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#define SPI_INT_RXFI (1 << 4)
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#define SPI_INT_MSTI (1 << 5)
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/* Bit fields in DMACR */
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#define SPI_DMA_RDMAE (1 << 0)
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#define SPI_DMA_TDMAE (1 << 1)
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/* TX RX interrupt level threshold, max can be 256 */
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#define SPI_INT_THRESHOLD 32
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enum dw_ssi_type {
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SSI_MOTO_SPI = 0,
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SSI_TI_SSP,
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SSI_NS_MICROWIRE,
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};
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struct dw_spi;
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struct dw_spi_dma_ops {
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int (*dma_init)(struct dw_spi *dws);
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void (*dma_exit)(struct dw_spi *dws);
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int (*dma_setup)(struct dw_spi *dws, struct spi_transfer *xfer);
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bool (*can_dma)(struct spi_controller *master, struct spi_device *spi,
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struct spi_transfer *xfer);
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int (*dma_transfer)(struct dw_spi *dws, struct spi_transfer *xfer);
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void (*dma_stop)(struct dw_spi *dws);
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};
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struct dw_spi {
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struct spi_controller *master;
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enum dw_ssi_type type;
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void __iomem *regs;
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unsigned long paddr;
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int irq;
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u32 fifo_len; /* depth of the FIFO buffer */
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u32 max_freq; /* max bus freq supported */
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int cs_override;
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u32 reg_io_width; /* DR I/O width in bytes */
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u16 bus_num;
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u16 num_cs; /* supported slave numbers */
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void (*set_cs)(struct spi_device *spi, bool enable);
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/* Current message transfer state info */
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size_t len;
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void *tx;
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void *tx_end;
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void *rx;
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void *rx_end;
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int dma_mapped;
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u8 n_bytes; /* current is a 1/2 bytes op */
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u32 dma_width;
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irqreturn_t (*transfer_handler)(struct dw_spi *dws);
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u32 current_freq; /* frequency in hz */
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/* DMA info */
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int dma_inited;
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struct dma_chan *txchan;
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struct dma_chan *rxchan;
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unsigned long dma_chan_busy;
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dma_addr_t dma_addr; /* phy address of the Data register */
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const struct dw_spi_dma_ops *dma_ops;
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void *dma_tx;
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void *dma_rx;
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/* Bus interface info */
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void *priv;
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#ifdef CONFIG_DEBUG_FS
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struct dentry *debugfs;
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#endif
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};
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static inline u32 dw_readl(struct dw_spi *dws, u32 offset)
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{
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return __raw_readl(dws->regs + offset);
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}
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static inline u16 dw_readw(struct dw_spi *dws, u32 offset)
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{
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return __raw_readw(dws->regs + offset);
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}
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static inline void dw_writel(struct dw_spi *dws, u32 offset, u32 val)
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{
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__raw_writel(val, dws->regs + offset);
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}
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static inline void dw_writew(struct dw_spi *dws, u32 offset, u16 val)
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{
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__raw_writew(val, dws->regs + offset);
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}
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static inline u32 dw_read_io_reg(struct dw_spi *dws, u32 offset)
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{
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switch (dws->reg_io_width) {
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case 2:
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return dw_readw(dws, offset);
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case 4:
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default:
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return dw_readl(dws, offset);
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}
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}
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static inline void dw_write_io_reg(struct dw_spi *dws, u32 offset, u32 val)
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{
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switch (dws->reg_io_width) {
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case 2:
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dw_writew(dws, offset, val);
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break;
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case 4:
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default:
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dw_writel(dws, offset, val);
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break;
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}
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}
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static inline void spi_enable_chip(struct dw_spi *dws, int enable)
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{
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dw_writel(dws, DW_SPI_SSIENR, (enable ? 1 : 0));
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}
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static inline void spi_set_clk(struct dw_spi *dws, u16 div)
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{
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dw_writel(dws, DW_SPI_BAUDR, div);
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}
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/* Disable IRQ bits */
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static inline void spi_mask_intr(struct dw_spi *dws, u32 mask)
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{
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u32 new_mask;
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new_mask = dw_readl(dws, DW_SPI_IMR) & ~mask;
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dw_writel(dws, DW_SPI_IMR, new_mask);
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}
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/* Enable IRQ bits */
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static inline void spi_umask_intr(struct dw_spi *dws, u32 mask)
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{
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u32 new_mask;
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new_mask = dw_readl(dws, DW_SPI_IMR) | mask;
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dw_writel(dws, DW_SPI_IMR, new_mask);
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}
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/*
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* This does disable the SPI controller, interrupts, and re-enable the
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* controller back. Transmit and receive FIFO buffers are cleared when the
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* device is disabled.
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*/
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static inline void spi_reset_chip(struct dw_spi *dws)
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{
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spi_enable_chip(dws, 0);
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spi_mask_intr(dws, 0xff);
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spi_enable_chip(dws, 1);
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}
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static inline void spi_shutdown_chip(struct dw_spi *dws)
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{
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spi_enable_chip(dws, 0);
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spi_set_clk(dws, 0);
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}
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/*
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* Each SPI slave device to work with dw_api controller should
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* has such a structure claiming its working mode (poll or PIO/DMA),
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* which can be save in the "controller_data" member of the
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* struct spi_device.
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*/
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struct dw_spi_chip {
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u8 poll_mode; /* 1 for controller polling mode */
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u8 type; /* SPI/SSP/MicroWire */
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void (*cs_control)(u32 command);
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};
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extern void dw_spi_set_cs(struct spi_device *spi, bool enable);
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extern int dw_spi_add_host(struct device *dev, struct dw_spi *dws);
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extern void dw_spi_remove_host(struct dw_spi *dws);
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extern int dw_spi_suspend_host(struct dw_spi *dws);
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extern int dw_spi_resume_host(struct dw_spi *dws);
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/* platform related setup */
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extern int dw_spi_mid_init(struct dw_spi *dws); /* Intel MID platforms */
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#endif /* DW_SPI_HEADER_H */
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