--- /dev/null
+/*
+ * SuperH MSIOF SPI Master Interface
+ *
+ * Copyright (c) 2009 Magnus Damm
+ * Copyright (C) 2014 Glider bvba
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#include <linux/bitmap.h>
+#include <linux/clk.h>
+#include <linux/completion.h>
+#include <linux/delay.h>
+#include <linux/dma-mapping.h>
+#include <linux/dmaengine.h>
+#include <linux/err.h>
+#include <linux/gpio.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/sh_dma.h>
+
+#include <linux/spi/sh_msiof.h>
+#include <linux/spi/spi.h>
+
+#include <asm/unaligned.h>
+
+
+struct sh_msiof_chipdata {
+ u16 tx_fifo_size;
+ u16 rx_fifo_size;
+ u16 master_flags;
+};
+
+struct sh_msiof_spi_priv {
+ struct spi_master *master;
+ void __iomem *mapbase;
+ struct clk *clk;
+ struct platform_device *pdev;
+ const struct sh_msiof_chipdata *chipdata;
+ struct sh_msiof_spi_info *info;
+ struct completion done;
+ int tx_fifo_size;
+ int rx_fifo_size;
+ void *tx_dma_page;
+ void *rx_dma_page;
+ dma_addr_t tx_dma_addr;
+ dma_addr_t rx_dma_addr;
+};
+
+#define TMDR1 0x00 /* Transmit Mode Register 1 */
+#define TMDR2 0x04 /* Transmit Mode Register 2 */
+#define TMDR3 0x08 /* Transmit Mode Register 3 */
+#define RMDR1 0x10 /* Receive Mode Register 1 */
+#define RMDR2 0x14 /* Receive Mode Register 2 */
+#define RMDR3 0x18 /* Receive Mode Register 3 */
+#define TSCR 0x20 /* Transmit Clock Select Register */
+#define RSCR 0x22 /* Receive Clock Select Register (SH, A1, APE6) */
+#define CTR 0x28 /* Control Register */
+#define FCTR 0x30 /* FIFO Control Register */
+#define STR 0x40 /* Status Register */
+#define IER 0x44 /* Interrupt Enable Register */
+#define TDR1 0x48 /* Transmit Control Data Register 1 (SH, A1) */
+#define TDR2 0x4c /* Transmit Control Data Register 2 (SH, A1) */
+#define TFDR 0x50 /* Transmit FIFO Data Register */
+#define RDR1 0x58 /* Receive Control Data Register 1 (SH, A1) */
+#define RDR2 0x5c /* Receive Control Data Register 2 (SH, A1) */
+#define RFDR 0x60 /* Receive FIFO Data Register */
+
+/* TMDR1 and RMDR1 */
+#define MDR1_TRMD 0x80000000 /* Transfer Mode (1 = Master mode) */
+#define MDR1_SYNCMD_MASK 0x30000000 /* SYNC Mode */
+#define MDR1_SYNCMD_SPI 0x20000000 /* Level mode/SPI */
+#define MDR1_SYNCMD_LR 0x30000000 /* L/R mode */
+#define MDR1_SYNCAC_SHIFT 25 /* Sync Polarity (1 = Active-low) */
+#define MDR1_BITLSB_SHIFT 24 /* MSB/LSB First (1 = LSB first) */
+#define MDR1_DTDL_SHIFT 20 /* Data Pin Bit Delay for MSIOF_SYNC */
+#define MDR1_SYNCDL_SHIFT 16 /* Frame Sync Signal Timing Delay */
+#define MDR1_FLD_MASK 0x0000000c /* Frame Sync Signal Interval (0-3) */
+#define MDR1_FLD_SHIFT 2
+#define MDR1_XXSTP 0x00000001 /* Transmission/Reception Stop on FIFO */
+/* TMDR1 */
+#define TMDR1_PCON 0x40000000 /* Transfer Signal Connection */
+
+/* TMDR2 and RMDR2 */
+#define MDR2_BITLEN1(i) (((i) - 1) << 24) /* Data Size (8-32 bits) */
+#define MDR2_WDLEN1(i) (((i) - 1) << 16) /* Word Count (1-64/256 (SH, A1))) */
+#define MDR2_GRPMASK1 0x00000001 /* Group Output Mask 1 (SH, A1) */
+
+#define MAX_WDLEN 256U
+
+/* TSCR and RSCR */
+#define SCR_BRPS_MASK 0x1f00 /* Prescaler Setting (1-32) */
+#define SCR_BRPS(i) (((i) - 1) << 8)
+#define SCR_BRDV_MASK 0x0007 /* Baud Rate Generator's Division Ratio */
+#define SCR_BRDV_DIV_2 0x0000
+#define SCR_BRDV_DIV_4 0x0001
+#define SCR_BRDV_DIV_8 0x0002
+#define SCR_BRDV_DIV_16 0x0003
+#define SCR_BRDV_DIV_32 0x0004
+#define SCR_BRDV_DIV_1 0x0007
+
+/* CTR */
+#define CTR_TSCKIZ_MASK 0xc0000000 /* Transmit Clock I/O Polarity Select */
+#define CTR_TSCKIZ_SCK 0x80000000 /* Disable SCK when TX disabled */
+#define CTR_TSCKIZ_POL_SHIFT 30 /* Transmit Clock Polarity */
+#define CTR_RSCKIZ_MASK 0x30000000 /* Receive Clock Polarity Select */
+#define CTR_RSCKIZ_SCK 0x20000000 /* Must match CTR_TSCKIZ_SCK */
+#define CTR_RSCKIZ_POL_SHIFT 28 /* Receive Clock Polarity */
+#define CTR_TEDG_SHIFT 27 /* Transmit Timing (1 = falling edge) */
+#define CTR_REDG_SHIFT 26 /* Receive Timing (1 = falling edge) */
+#define CTR_TXDIZ_MASK 0x00c00000 /* Pin Output When TX is Disabled */
+#define CTR_TXDIZ_LOW 0x00000000 /* 0 */
+#define CTR_TXDIZ_HIGH 0x00400000 /* 1 */
+#define CTR_TXDIZ_HIZ 0x00800000 /* High-impedance */
+#define CTR_TSCKE 0x00008000 /* Transmit Serial Clock Output Enable */
+#define CTR_TFSE 0x00004000 /* Transmit Frame Sync Signal Output Enable */
+#define CTR_TXE 0x00000200 /* Transmit Enable */
+#define CTR_RXE 0x00000100 /* Receive Enable */
+
+/* FCTR */
+#define FCTR_TFWM_MASK 0xe0000000 /* Transmit FIFO Watermark */
+#define FCTR_TFWM_64 0x00000000 /* Transfer Request when 64 empty stages */
+#define FCTR_TFWM_32 0x20000000 /* Transfer Request when 32 empty stages */
+#define FCTR_TFWM_24 0x40000000 /* Transfer Request when 24 empty stages */
+#define FCTR_TFWM_16 0x60000000 /* Transfer Request when 16 empty stages */
+#define FCTR_TFWM_12 0x80000000 /* Transfer Request when 12 empty stages */
+#define FCTR_TFWM_8 0xa0000000 /* Transfer Request when 8 empty stages */
+#define FCTR_TFWM_4 0xc0000000 /* Transfer Request when 4 empty stages */
+#define FCTR_TFWM_1 0xe0000000 /* Transfer Request when 1 empty stage */
+#define FCTR_TFUA_MASK 0x07f00000 /* Transmit FIFO Usable Area */
+#define FCTR_TFUA_SHIFT 20
+#define FCTR_TFUA(i) ((i) << FCTR_TFUA_SHIFT)
+#define FCTR_RFWM_MASK 0x0000e000 /* Receive FIFO Watermark */
+#define FCTR_RFWM_1 0x00000000 /* Transfer Request when 1 valid stages */
+#define FCTR_RFWM_4 0x00002000 /* Transfer Request when 4 valid stages */
+#define FCTR_RFWM_8 0x00004000 /* Transfer Request when 8 valid stages */
+#define FCTR_RFWM_16 0x00006000 /* Transfer Request when 16 valid stages */
+#define FCTR_RFWM_32 0x00008000 /* Transfer Request when 32 valid stages */
+#define FCTR_RFWM_64 0x0000a000 /* Transfer Request when 64 valid stages */
+#define FCTR_RFWM_128 0x0000c000 /* Transfer Request when 128 valid stages */
+#define FCTR_RFWM_256 0x0000e000 /* Transfer Request when 256 valid stages */
+#define FCTR_RFUA_MASK 0x00001ff0 /* Receive FIFO Usable Area (0x40 = full) */
+#define FCTR_RFUA_SHIFT 4
+#define FCTR_RFUA(i) ((i) << FCTR_RFUA_SHIFT)
+
+/* STR */
+#define STR_TFEMP 0x20000000 /* Transmit FIFO Empty */
+#define STR_TDREQ 0x10000000 /* Transmit Data Transfer Request */
+#define STR_TEOF 0x00800000 /* Frame Transmission End */
+#define STR_TFSERR 0x00200000 /* Transmit Frame Synchronization Error */
+#define STR_TFOVF 0x00100000 /* Transmit FIFO Overflow */
+#define STR_TFUDF 0x00080000 /* Transmit FIFO Underflow */
+#define STR_RFFUL 0x00002000 /* Receive FIFO Full */
+#define STR_RDREQ 0x00001000 /* Receive Data Transfer Request */
+#define STR_REOF 0x00000080 /* Frame Reception End */
+#define STR_RFSERR 0x00000020 /* Receive Frame Synchronization Error */
+#define STR_RFUDF 0x00000010 /* Receive FIFO Underflow */
+#define STR_RFOVF 0x00000008 /* Receive FIFO Overflow */
+
+/* IER */
+#define IER_TDMAE 0x80000000 /* Transmit Data DMA Transfer Req. Enable */
+#define IER_TFEMPE 0x20000000 /* Transmit FIFO Empty Enable */
+#define IER_TDREQE 0x10000000 /* Transmit Data Transfer Request Enable */
+#define IER_TEOFE 0x00800000 /* Frame Transmission End Enable */
+#define IER_TFSERRE 0x00200000 /* Transmit Frame Sync Error Enable */
+#define IER_TFOVFE 0x00100000 /* Transmit FIFO Overflow Enable */
+#define IER_TFUDFE 0x00080000 /* Transmit FIFO Underflow Enable */
+#define IER_RDMAE 0x00008000 /* Receive Data DMA Transfer Req. Enable */
+#define IER_RFFULE 0x00002000 /* Receive FIFO Full Enable */
+#define IER_RDREQE 0x00001000 /* Receive Data Transfer Request Enable */
+#define IER_REOFE 0x00000080 /* Frame Reception End Enable */
+#define IER_RFSERRE 0x00000020 /* Receive Frame Sync Error Enable */
+#define IER_RFUDFE 0x00000010 /* Receive FIFO Underflow Enable */
+#define IER_RFOVFE 0x00000008 /* Receive FIFO Overflow Enable */
+
+
+static u32 sh_msiof_read(struct sh_msiof_spi_priv *p, int reg_offs)
+{
+ switch (reg_offs) {
+ case TSCR:
+ case RSCR:
+ return ioread16(p->mapbase + reg_offs);
+ default:
+ return ioread32(p->mapbase + reg_offs);
+ }
+}
+
+static void sh_msiof_write(struct sh_msiof_spi_priv *p, int reg_offs,
+ u32 value)
+{
+ switch (reg_offs) {
+ case TSCR:
+ case RSCR:
+ iowrite16(value, p->mapbase + reg_offs);
+ break;
+ default:
+ iowrite32(value, p->mapbase + reg_offs);
+ break;
+ }
+}
+
+static int sh_msiof_modify_ctr_wait(struct sh_msiof_spi_priv *p,
+ u32 clr, u32 set)
+{
+ u32 mask = clr | set;
+ u32 data;
+ int k;
+
+ data = sh_msiof_read(p, CTR);
+ data &= ~clr;
+ data |= set;
+ sh_msiof_write(p, CTR, data);
+
+ for (k = 100; k > 0; k--) {
+ if ((sh_msiof_read(p, CTR) & mask) == set)
+ break;
+
+ udelay(10);
+ }
+
+ return k > 0 ? 0 : -ETIMEDOUT;
+}
+
+static irqreturn_t sh_msiof_spi_irq(int irq, void *data)
+{
+ struct sh_msiof_spi_priv *p = data;
+
+ /* just disable the interrupt and wake up */
+ sh_msiof_write(p, IER, 0);
+ complete(&p->done);
+
+ return IRQ_HANDLED;
+}
+
+static struct {
+ unsigned short div;
+ unsigned short brdv;
+} const sh_msiof_spi_div_table[] = {
+ { 1, SCR_BRDV_DIV_1 },
+ { 2, SCR_BRDV_DIV_2 },
+ { 4, SCR_BRDV_DIV_4 },
+ { 8, SCR_BRDV_DIV_8 },
+ { 16, SCR_BRDV_DIV_16 },
+ { 32, SCR_BRDV_DIV_32 },
+};
+
+static void sh_msiof_spi_set_clk_regs(struct sh_msiof_spi_priv *p,
+ unsigned long parent_rate, u32 spi_hz)
+{
+ unsigned long div = 1024;
+ u32 brps, scr;
+ size_t k;
+
+ if (!WARN_ON(!spi_hz || !parent_rate))
+ div = DIV_ROUND_UP(parent_rate, spi_hz);
+
+ for (k = 0; k < ARRAY_SIZE(sh_msiof_spi_div_table); k++) {
+ brps = DIV_ROUND_UP(div, sh_msiof_spi_div_table[k].div);
+ if (brps <= 32) /* max of brdv is 32 */
+ break;
+ }
+
+ k = min_t(int, k, ARRAY_SIZE(sh_msiof_spi_div_table) - 1);
+
+ scr = sh_msiof_spi_div_table[k].brdv | SCR_BRPS(brps);
+ sh_msiof_write(p, TSCR, scr);
+ if (!(p->chipdata->master_flags & SPI_MASTER_MUST_TX))
+ sh_msiof_write(p, RSCR, scr);
+}
+
+static u32 sh_msiof_get_delay_bit(u32 dtdl_or_syncdl)
+{
+ /*
+ * DTDL/SYNCDL bit : p->info->dtdl or p->info->syncdl
+ * b'000 : 0
+ * b'001 : 100
+ * b'010 : 200
+ * b'011 (SYNCDL only) : 300
+ * b'101 : 50
+ * b'110 : 150
+ */
+ if (dtdl_or_syncdl % 100)
+ return dtdl_or_syncdl / 100 + 5;
+ else
+ return dtdl_or_syncdl / 100;
+}
+
+static u32 sh_msiof_spi_get_dtdl_and_syncdl(struct sh_msiof_spi_priv *p)
+{
+ u32 val;
+
+ if (!p->info)
+ return 0;
+
+ /* check if DTDL and SYNCDL is allowed value */
+ if (p->info->dtdl > 200 || p->info->syncdl > 300) {
+ dev_warn(&p->pdev->dev, "DTDL or SYNCDL is too large\n");
+ return 0;
+ }
+
+ /* check if the sum of DTDL and SYNCDL becomes an integer value */
+ if ((p->info->dtdl + p->info->syncdl) % 100) {
+ dev_warn(&p->pdev->dev, "the sum of DTDL/SYNCDL is not good\n");
+ return 0;
+ }
+
+ val = sh_msiof_get_delay_bit(p->info->dtdl) << MDR1_DTDL_SHIFT;
+ val |= sh_msiof_get_delay_bit(p->info->syncdl) << MDR1_SYNCDL_SHIFT;
+
+ return val;
+}
+
+static void sh_msiof_spi_set_pin_regs(struct sh_msiof_spi_priv *p,
+ u32 cpol, u32 cpha,
+ u32 tx_hi_z, u32 lsb_first, u32 cs_high)
+{
+ u32 tmp;
+ int edge;
+
+ /*
+ * CPOL CPHA TSCKIZ RSCKIZ TEDG REDG
+ * 0 0 10 10 1 1
+ * 0 1 10 10 0 0
+ * 1 0 11 11 0 0
+ * 1 1 11 11 1 1
+ */
+ tmp = MDR1_SYNCMD_SPI | 1 << MDR1_FLD_SHIFT | MDR1_XXSTP;
+ tmp |= !cs_high << MDR1_SYNCAC_SHIFT;
+ tmp |= lsb_first << MDR1_BITLSB_SHIFT;
+ tmp |= sh_msiof_spi_get_dtdl_and_syncdl(p);
+ sh_msiof_write(p, TMDR1, tmp | MDR1_TRMD | TMDR1_PCON);
+ if (p->chipdata->master_flags & SPI_MASTER_MUST_TX) {
+ /* These bits are reserved if RX needs TX */
+ tmp &= ~0x0000ffff;
+ }
+ sh_msiof_write(p, RMDR1, tmp);
+
+ tmp = 0;
+ tmp |= CTR_TSCKIZ_SCK | cpol << CTR_TSCKIZ_POL_SHIFT;
+ tmp |= CTR_RSCKIZ_SCK | cpol << CTR_RSCKIZ_POL_SHIFT;
+
+ edge = cpol ^ !cpha;
+
+ tmp |= edge << CTR_TEDG_SHIFT;
+ tmp |= edge << CTR_REDG_SHIFT;
+ tmp |= tx_hi_z ? CTR_TXDIZ_HIZ : CTR_TXDIZ_LOW;
+ sh_msiof_write(p, CTR, tmp);
+}
+
+static void sh_msiof_spi_set_mode_regs(struct sh_msiof_spi_priv *p,
+ const void *tx_buf, void *rx_buf,
+ u32 bits, u32 words)
+{
+ u32 dr2 = MDR2_BITLEN1(bits) | MDR2_WDLEN1(words);
+
+ if (tx_buf || (p->chipdata->master_flags & SPI_MASTER_MUST_TX))
+ sh_msiof_write(p, TMDR2, dr2);
+ else
+ sh_msiof_write(p, TMDR2, dr2 | MDR2_GRPMASK1);
+
+ if (rx_buf)
+ sh_msiof_write(p, RMDR2, dr2);
+}
+
+static void sh_msiof_reset_str(struct sh_msiof_spi_priv *p)
+{
+ sh_msiof_write(p, STR, sh_msiof_read(p, STR));
+}
+
+static void sh_msiof_spi_write_fifo_8(struct sh_msiof_spi_priv *p,
+ const void *tx_buf, int words, int fs)
+{
+ const u8 *buf_8 = tx_buf;
+ int k;
+
+ for (k = 0; k < words; k++)
+ sh_msiof_write(p, TFDR, buf_8[k] << fs);
+}
+
+static void sh_msiof_spi_write_fifo_16(struct sh_msiof_spi_priv *p,
+ const void *tx_buf, int words, int fs)
+{
+ const u16 *buf_16 = tx_buf;
+ int k;
+
+ for (k = 0; k < words; k++)
+ sh_msiof_write(p, TFDR, buf_16[k] << fs);
+}
+
+static void sh_msiof_spi_write_fifo_16u(struct sh_msiof_spi_priv *p,
+ const void *tx_buf, int words, int fs)
+{
+ const u16 *buf_16 = tx_buf;
+ int k;
+
+ for (k = 0; k < words; k++)
+ sh_msiof_write(p, TFDR, get_unaligned(&buf_16[k]) << fs);
+}
+
+static void sh_msiof_spi_write_fifo_32(struct sh_msiof_spi_priv *p,
+ const void *tx_buf, int words, int fs)
+{
+ const u32 *buf_32 = tx_buf;
+ int k;
+
+ for (k = 0; k < words; k++)
+ sh_msiof_write(p, TFDR, buf_32[k] << fs);
+}
+
+static void sh_msiof_spi_write_fifo_32u(struct sh_msiof_spi_priv *p,
+ const void *tx_buf, int words, int fs)
+{
+ const u32 *buf_32 = tx_buf;
+ int k;
+
+ for (k = 0; k < words; k++)
+ sh_msiof_write(p, TFDR, get_unaligned(&buf_32[k]) << fs);
+}
+
+static void sh_msiof_spi_write_fifo_s32(struct sh_msiof_spi_priv *p,
+ const void *tx_buf, int words, int fs)
+{
+ const u32 *buf_32 = tx_buf;
+ int k;
+
+ for (k = 0; k < words; k++)
+ sh_msiof_write(p, TFDR, swab32(buf_32[k] << fs));
+}
+
+static void sh_msiof_spi_write_fifo_s32u(struct sh_msiof_spi_priv *p,
+ const void *tx_buf, int words, int fs)
+{
+ const u32 *buf_32 = tx_buf;
+ int k;
+
+ for (k = 0; k < words; k++)
+ sh_msiof_write(p, TFDR, swab32(get_unaligned(&buf_32[k]) << fs));
+}
+
+static void sh_msiof_spi_read_fifo_8(struct sh_msiof_spi_priv *p,
+ void *rx_buf, int words, int fs)
+{
+ u8 *buf_8 = rx_buf;
+ int k;
+
+ for (k = 0; k < words; k++)
+ buf_8[k] = sh_msiof_read(p, RFDR) >> fs;
+}
+
+static void sh_msiof_spi_read_fifo_16(struct sh_msiof_spi_priv *p,
+ void *rx_buf, int words, int fs)
+{
+ u16 *buf_16 = rx_buf;
+ int k;
+
+ for (k = 0; k < words; k++)
+ buf_16[k] = sh_msiof_read(p, RFDR) >> fs;
+}
+
+static void sh_msiof_spi_read_fifo_16u(struct sh_msiof_spi_priv *p,
+ void *rx_buf, int words, int fs)
+{
+ u16 *buf_16 = rx_buf;
+ int k;
+
+ for (k = 0; k < words; k++)
+ put_unaligned(sh_msiof_read(p, RFDR) >> fs, &buf_16[k]);
+}
+
+static void sh_msiof_spi_read_fifo_32(struct sh_msiof_spi_priv *p,
+ void *rx_buf, int words, int fs)
+{
+ u32 *buf_32 = rx_buf;
+ int k;
+
+ for (k = 0; k < words; k++)
+ buf_32[k] = sh_msiof_read(p, RFDR) >> fs;
+}
+
+static void sh_msiof_spi_read_fifo_32u(struct sh_msiof_spi_priv *p,
+ void *rx_buf, int words, int fs)
+{
+ u32 *buf_32 = rx_buf;
+ int k;
+
+ for (k = 0; k < words; k++)
+ put_unaligned(sh_msiof_read(p, RFDR) >> fs, &buf_32[k]);
+}
+
+static void sh_msiof_spi_read_fifo_s32(struct sh_msiof_spi_priv *p,
+ void *rx_buf, int words, int fs)
+{
+ u32 *buf_32 = rx_buf;
+ int k;
+
+ for (k = 0; k < words; k++)
+ buf_32[k] = swab32(sh_msiof_read(p, RFDR) >> fs);
+}
+
+static void sh_msiof_spi_read_fifo_s32u(struct sh_msiof_spi_priv *p,
+ void *rx_buf, int words, int fs)
+{
+ u32 *buf_32 = rx_buf;
+ int k;
+
+ for (k = 0; k < words; k++)
+ put_unaligned(swab32(sh_msiof_read(p, RFDR) >> fs), &buf_32[k]);
+}
+
+static int sh_msiof_spi_setup(struct spi_device *spi)
+{
+ struct device_node *np = spi->master->dev.of_node;
+ struct sh_msiof_spi_priv *p = spi_master_get_devdata(spi->master);
+
+ pm_runtime_get_sync(&p->pdev->dev);
+
+ if (!np) {
+ /*
+ * Use spi->controller_data for CS (same strategy as spi_gpio),
+ * if any. otherwise let HW control CS
+ */
+ spi->cs_gpio = (uintptr_t)spi->controller_data;
+ }
+
+ /* Configure pins before deasserting CS */
+ sh_msiof_spi_set_pin_regs(p, !!(spi->mode & SPI_CPOL),
+ !!(spi->mode & SPI_CPHA),
+ !!(spi->mode & SPI_3WIRE),
+ !!(spi->mode & SPI_LSB_FIRST),
+ !!(spi->mode & SPI_CS_HIGH));
+
+ if (spi->cs_gpio >= 0)
+ gpio_set_value(spi->cs_gpio, !(spi->mode & SPI_CS_HIGH));
+
+
+ pm_runtime_put(&p->pdev->dev);
+
+ return 0;
+}
+
+static int sh_msiof_prepare_message(struct spi_master *master,
+ struct spi_message *msg)
+{
+ struct sh_msiof_spi_priv *p = spi_master_get_devdata(master);
+ const struct spi_device *spi = msg->spi;
+
+ /* Configure pins before asserting CS */
+ sh_msiof_spi_set_pin_regs(p, !!(spi->mode & SPI_CPOL),
+ !!(spi->mode & SPI_CPHA),
+ !!(spi->mode & SPI_3WIRE),
+ !!(spi->mode & SPI_LSB_FIRST),
+ !!(spi->mode & SPI_CS_HIGH));
+ return 0;
+}
+
+static int sh_msiof_spi_start(struct sh_msiof_spi_priv *p, void *rx_buf)
+{
+ int ret;
+
+ /* setup clock and rx/tx signals */
+ ret = sh_msiof_modify_ctr_wait(p, 0, CTR_TSCKE);
+ if (rx_buf && !ret)
+ ret = sh_msiof_modify_ctr_wait(p, 0, CTR_RXE);
+ if (!ret)
+ ret = sh_msiof_modify_ctr_wait(p, 0, CTR_TXE);
+
+ /* start by setting frame bit */
+ if (!ret)
+ ret = sh_msiof_modify_ctr_wait(p, 0, CTR_TFSE);
+
+ return ret;
+}
+
+static int sh_msiof_spi_stop(struct sh_msiof_spi_priv *p, void *rx_buf)
+{
+ int ret;
+
+ /* shut down frame, rx/tx and clock signals */
+ ret = sh_msiof_modify_ctr_wait(p, CTR_TFSE, 0);
+ if (!ret)
+ ret = sh_msiof_modify_ctr_wait(p, CTR_TXE, 0);
+ if (rx_buf && !ret)
+ ret = sh_msiof_modify_ctr_wait(p, CTR_RXE, 0);
+ if (!ret)
+ ret = sh_msiof_modify_ctr_wait(p, CTR_TSCKE, 0);
+
+ return ret;
+}
+
+static int sh_msiof_spi_txrx_once(struct sh_msiof_spi_priv *p,
+ void (*tx_fifo)(struct sh_msiof_spi_priv *,
+ const void *, int, int),
+ void (*rx_fifo)(struct sh_msiof_spi_priv *,
+ void *, int, int),
+ const void *tx_buf, void *rx_buf,
+ int words, int bits)
+{
+ int fifo_shift;
+ int ret;
+
+ /* limit maximum word transfer to rx/tx fifo size */
+ if (tx_buf)
+ words = min_t(int, words, p->tx_fifo_size);
+ if (rx_buf)
+ words = min_t(int, words, p->rx_fifo_size);
+
+ /* the fifo contents need shifting */
+ fifo_shift = 32 - bits;
+
+ /* default FIFO watermarks for PIO */
+ sh_msiof_write(p, FCTR, 0);
+
+ /* setup msiof transfer mode registers */
+ sh_msiof_spi_set_mode_regs(p, tx_buf, rx_buf, bits, words);
+ sh_msiof_write(p, IER, IER_TEOFE | IER_REOFE);
+
+ /* write tx fifo */
+ if (tx_buf)
+ tx_fifo(p, tx_buf, words, fifo_shift);
+
+ reinit_completion(&p->done);
+
+ ret = sh_msiof_spi_start(p, rx_buf);
+ if (ret) {
+ dev_err(&p->pdev->dev, "failed to start hardware\n");
+ goto stop_ier;
+ }
+
+ /* wait for tx fifo to be emptied / rx fifo to be filled */
+ if (!wait_for_completion_timeout(&p->done, HZ)) {
+ dev_err(&p->pdev->dev, "PIO timeout\n");
+ ret = -ETIMEDOUT;
+ goto stop_reset;
+ }
+
+ /* read rx fifo */
+ if (rx_buf)
+ rx_fifo(p, rx_buf, words, fifo_shift);
+
+ /* clear status bits */
+ sh_msiof_reset_str(p);
+
+ ret = sh_msiof_spi_stop(p, rx_buf);
+ if (ret) {
+ dev_err(&p->pdev->dev, "failed to shut down hardware\n");
+ return ret;
+ }
+
+ return words;
+
+stop_reset:
+ sh_msiof_reset_str(p);
+ sh_msiof_spi_stop(p, rx_buf);
+stop_ier:
+ sh_msiof_write(p, IER, 0);
+ return ret;
+}
+
+static void sh_msiof_dma_complete(void *arg)
+{
+ struct sh_msiof_spi_priv *p = arg;
+
+ sh_msiof_write(p, IER, 0);
+ complete(&p->done);
+}
+
+static int sh_msiof_dma_once(struct sh_msiof_spi_priv *p, const void *tx,
+ void *rx, unsigned int len)
+{
+ u32 ier_bits = 0;
+ struct dma_async_tx_descriptor *desc_tx = NULL, *desc_rx = NULL;
+ dma_cookie_t cookie;
+ int ret;
+
+ /* First prepare and submit the DMA request(s), as this may fail */
+ if (rx) {
+ ier_bits |= IER_RDREQE | IER_RDMAE;
+ desc_rx = dmaengine_prep_slave_single(p->master->dma_rx,
+ p->rx_dma_addr, len, DMA_FROM_DEVICE,
+ DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
+ if (!desc_rx)
+ return -EAGAIN;
+
+ desc_rx->callback = sh_msiof_dma_complete;
+ desc_rx->callback_param = p;
+ cookie = dmaengine_submit(desc_rx);
+ if (dma_submit_error(cookie))
+ return cookie;
+ }
+
+ if (tx) {
+ ier_bits |= IER_TDREQE | IER_TDMAE;
+ dma_sync_single_for_device(p->master->dma_tx->device->dev,
+ p->tx_dma_addr, len, DMA_TO_DEVICE);
+ desc_tx = dmaengine_prep_slave_single(p->master->dma_tx,
+ p->tx_dma_addr, len, DMA_TO_DEVICE,
+ DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
+ if (!desc_tx) {
+ ret = -EAGAIN;
+ goto no_dma_tx;
+ }
+
+ if (rx) {
+ /* No callback */
+ desc_tx->callback = NULL;
+ } else {
+ desc_tx->callback = sh_msiof_dma_complete;
+ desc_tx->callback_param = p;
+ }
+ cookie = dmaengine_submit(desc_tx);
+ if (dma_submit_error(cookie)) {
+ ret = cookie;
+ goto no_dma_tx;
+ }
+ }
+
+ /* 1 stage FIFO watermarks for DMA */
+ sh_msiof_write(p, FCTR, FCTR_TFWM_1 | FCTR_RFWM_1);
+
+ /* setup msiof transfer mode registers (32-bit words) */
+ sh_msiof_spi_set_mode_regs(p, tx, rx, 32, len / 4);
+
+ sh_msiof_write(p, IER, ier_bits);
+
+ reinit_completion(&p->done);
+
+ /* Now start DMA */
+ if (rx)
+ dma_async_issue_pending(p->master->dma_rx);
+ if (tx)
+ dma_async_issue_pending(p->master->dma_tx);
+
+ ret = sh_msiof_spi_start(p, rx);
+ if (ret) {
+ dev_err(&p->pdev->dev, "failed to start hardware\n");
+ goto stop_dma;
+ }
+
+ /* wait for tx fifo to be emptied / rx fifo to be filled */
+ if (!wait_for_completion_timeout(&p->done, HZ)) {
+ dev_err(&p->pdev->dev, "DMA timeout\n");
+ ret = -ETIMEDOUT;
+ goto stop_reset;
+ }
+
+ /* clear status bits */
+ sh_msiof_reset_str(p);
+
+ ret = sh_msiof_spi_stop(p, rx);
+ if (ret) {
+ dev_err(&p->pdev->dev, "failed to shut down hardware\n");
+ return ret;
+ }
+
+ if (rx)
+ dma_sync_single_for_cpu(p->master->dma_rx->device->dev,
+ p->rx_dma_addr, len,
+ DMA_FROM_DEVICE);
+
+ return 0;
+
+stop_reset:
+ sh_msiof_reset_str(p);
+ sh_msiof_spi_stop(p, rx);
+stop_dma:
+ if (tx)
+ dmaengine_terminate_all(p->master->dma_tx);
+no_dma_tx:
+ if (rx)
+ dmaengine_terminate_all(p->master->dma_rx);
+ sh_msiof_write(p, IER, 0);
+ return ret;
+}
+
+static void copy_bswap32(u32 *dst, const u32 *src, unsigned int words)
+{
+ /* src or dst can be unaligned, but not both */
+ if ((unsigned long)src & 3) {
+ while (words--) {
+ *dst++ = swab32(get_unaligned(src));
+ src++;
+ }
+ } else if ((unsigned long)dst & 3) {
+ while (words--) {
+ put_unaligned(swab32(*src++), dst);
+ dst++;
+ }
+ } else {
+ while (words--)
+ *dst++ = swab32(*src++);
+ }
+}
+
+static void copy_wswap32(u32 *dst, const u32 *src, unsigned int words)
+{
+ /* src or dst can be unaligned, but not both */
+ if ((unsigned long)src & 3) {
+ while (words--) {
+ *dst++ = swahw32(get_unaligned(src));
+ src++;
+ }
+ } else if ((unsigned long)dst & 3) {
+ while (words--) {
+ put_unaligned(swahw32(*src++), dst);
+ dst++;
+ }
+ } else {
+ while (words--)
+ *dst++ = swahw32(*src++);
+ }
+}
+
+static void copy_plain32(u32 *dst, const u32 *src, unsigned int words)
+{
+ memcpy(dst, src, words * 4);
+}
+
+static int sh_msiof_transfer_one(struct spi_master *master,
+ struct spi_device *spi,
+ struct spi_transfer *t)
+{
+ struct sh_msiof_spi_priv *p = spi_master_get_devdata(master);
+ void (*copy32)(u32 *, const u32 *, unsigned int);
+ void (*tx_fifo)(struct sh_msiof_spi_priv *, const void *, int, int);
+ void (*rx_fifo)(struct sh_msiof_spi_priv *, void *, int, int);
+ const void *tx_buf = t->tx_buf;
+ void *rx_buf = t->rx_buf;
+ unsigned int len = t->len;
+ unsigned int bits = t->bits_per_word;
+ unsigned int bytes_per_word;
+ unsigned int words;
+ int n;
+ bool swab;
+ int ret;
+
+ /* setup clocks (clock already enabled in chipselect()) */
+ sh_msiof_spi_set_clk_regs(p, clk_get_rate(p->clk), t->speed_hz);
+
+ while (master->dma_tx && len > 15) {
+ /*
+ * DMA supports 32-bit words only, hence pack 8-bit and 16-bit
+ * words, with byte resp. word swapping.
+ */
+ unsigned int l = min(len, MAX_WDLEN * 4);
+
+ if (bits <= 8) {
+ if (l & 3)
+ break;
+ copy32 = copy_bswap32;
+ } else if (bits <= 16) {
+ if (l & 1)
+ break;
+ copy32 = copy_wswap32;
+ } else {
+ copy32 = copy_plain32;
+ }
+
+ if (tx_buf)
+ copy32(p->tx_dma_page, tx_buf, l / 4);
+
+ ret = sh_msiof_dma_once(p, tx_buf, rx_buf, l);
+ if (ret == -EAGAIN) {
+ pr_warn_once("%s %s: DMA not available, falling back to PIO\n",
+ dev_driver_string(&p->pdev->dev),
+ dev_name(&p->pdev->dev));
+ break;
+ }
+ if (ret)
+ return ret;
+
+ if (rx_buf) {
+ copy32(rx_buf, p->rx_dma_page, l / 4);
+ rx_buf += l;
+ }
+ if (tx_buf)
+ tx_buf += l;
+
+ len -= l;
+ if (!len)
+ return 0;
+ }
+
+ if (bits <= 8 && len > 15 && !(len & 3)) {
+ bits = 32;
+ swab = true;
+ } else {
+ swab = false;
+ }
+
+ /* setup bytes per word and fifo read/write functions */
+ if (bits <= 8) {
+ bytes_per_word = 1;
+ tx_fifo = sh_msiof_spi_write_fifo_8;
+ rx_fifo = sh_msiof_spi_read_fifo_8;
+ } else if (bits <= 16) {
+ bytes_per_word = 2;
+ if ((unsigned long)tx_buf & 0x01)
+ tx_fifo = sh_msiof_spi_write_fifo_16u;
+ else
+ tx_fifo = sh_msiof_spi_write_fifo_16;
+
+ if ((unsigned long)rx_buf & 0x01)
+ rx_fifo = sh_msiof_spi_read_fifo_16u;
+ else
+ rx_fifo = sh_msiof_spi_read_fifo_16;
+ } else if (swab) {
+ bytes_per_word = 4;
+ if ((unsigned long)tx_buf & 0x03)
+ tx_fifo = sh_msiof_spi_write_fifo_s32u;
+ else
+ tx_fifo = sh_msiof_spi_write_fifo_s32;
+
+ if ((unsigned long)rx_buf & 0x03)
+ rx_fifo = sh_msiof_spi_read_fifo_s32u;
+ else
+ rx_fifo = sh_msiof_spi_read_fifo_s32;
+ } else {
+ bytes_per_word = 4;
+ if ((unsigned long)tx_buf & 0x03)
+ tx_fifo = sh_msiof_spi_write_fifo_32u;
+ else
+ tx_fifo = sh_msiof_spi_write_fifo_32;
+
+ if ((unsigned long)rx_buf & 0x03)
+ rx_fifo = sh_msiof_spi_read_fifo_32u;
+ else
+ rx_fifo = sh_msiof_spi_read_fifo_32;
+ }
+
+ /* transfer in fifo sized chunks */
+ words = len / bytes_per_word;
+
+ while (words > 0) {
+ n = sh_msiof_spi_txrx_once(p, tx_fifo, rx_fifo, tx_buf, rx_buf,
+ words, bits);
+ if (n < 0)
+ return n;
+
+ if (tx_buf)
+ tx_buf += n * bytes_per_word;
+ if (rx_buf)
+ rx_buf += n * bytes_per_word;
+ words -= n;
+ }
+
+ return 0;
+}
+
+static const struct sh_msiof_chipdata sh_data = {
+ .tx_fifo_size = 64,
+ .rx_fifo_size = 64,
+ .master_flags = 0,
+};
+
+static const struct sh_msiof_chipdata r8a779x_data = {
+ .tx_fifo_size = 64,
+ .rx_fifo_size = 256,
+ .master_flags = SPI_MASTER_MUST_TX,
+};
+
+static const struct of_device_id sh_msiof_match[] = {
+ { .compatible = "renesas,sh-msiof", .data = &sh_data },
+ { .compatible = "renesas,sh-mobile-msiof", .data = &sh_data },
+ { .compatible = "renesas,msiof-r8a7790", .data = &r8a779x_data },
+ { .compatible = "renesas,msiof-r8a7791", .data = &r8a779x_data },
+ { .compatible = "renesas,msiof-r8a7792", .data = &r8a779x_data },
+ { .compatible = "renesas,msiof-r8a7793", .data = &r8a779x_data },
+ { .compatible = "renesas,msiof-r8a7794", .data = &r8a779x_data },
+ {},
+};
+MODULE_DEVICE_TABLE(of, sh_msiof_match);
+
+#ifdef CONFIG_OF
+static struct sh_msiof_spi_info *sh_msiof_spi_parse_dt(struct device *dev)
+{
+ struct sh_msiof_spi_info *info;
+ struct device_node *np = dev->of_node;
+ u32 num_cs = 1;
+
+ info = devm_kzalloc(dev, sizeof(struct sh_msiof_spi_info), GFP_KERNEL);
+ if (!info)
+ return NULL;
+
+ /* Parse the MSIOF properties */
+ of_property_read_u32(np, "num-cs", &num_cs);
+ of_property_read_u32(np, "renesas,tx-fifo-size",
+ &info->tx_fifo_override);
+ of_property_read_u32(np, "renesas,rx-fifo-size",
+ &info->rx_fifo_override);
+ of_property_read_u32(np, "renesas,dtdl", &info->dtdl);
+ of_property_read_u32(np, "renesas,syncdl", &info->syncdl);
+
+ info->num_chipselect = num_cs;
+
+ return info;
+}
+#else
+static struct sh_msiof_spi_info *sh_msiof_spi_parse_dt(struct device *dev)
+{
+ return NULL;
+}
+#endif
+
+static struct dma_chan *sh_msiof_request_dma_chan(struct device *dev,
+ enum dma_transfer_direction dir, unsigned int id, dma_addr_t port_addr)
+{
+ dma_cap_mask_t mask;
+ struct dma_chan *chan;
+ struct dma_slave_config cfg;
+ int ret;
+
+ dma_cap_zero(mask);
+ dma_cap_set(DMA_SLAVE, mask);
+
+ chan = dma_request_slave_channel_compat(mask, shdma_chan_filter,
+ (void *)(unsigned long)id, dev,
+ dir == DMA_MEM_TO_DEV ? "tx" : "rx");
+ if (!chan) {
+ dev_warn(dev, "dma_request_slave_channel_compat failed\n");
+ return NULL;
+ }
+
+ memset(&cfg, 0, sizeof(cfg));
+ cfg.direction = dir;
+ if (dir == DMA_MEM_TO_DEV) {
+ cfg.dst_addr = port_addr;
+ cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
+ } else {
+ cfg.src_addr = port_addr;
+ cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
+ }
+
+ ret = dmaengine_slave_config(chan, &cfg);
+ if (ret) {
+ dev_warn(dev, "dmaengine_slave_config failed %d\n", ret);
+ dma_release_channel(chan);
+ return NULL;
+ }
+
+ return chan;
+}
+
+static int sh_msiof_request_dma(struct sh_msiof_spi_priv *p)
+{
+ struct platform_device *pdev = p->pdev;
+ struct device *dev = &pdev->dev;
+ const struct sh_msiof_spi_info *info = dev_get_platdata(dev);
+ unsigned int dma_tx_id, dma_rx_id;
+ const struct resource *res;
+ struct spi_master *master;
+ struct device *tx_dev, *rx_dev;
+
+ if (dev->of_node) {
+ /* In the OF case we will get the slave IDs from the DT */
+ dma_tx_id = 0;
+ dma_rx_id = 0;
+ } else if (info && info->dma_tx_id && info->dma_rx_id) {
+ dma_tx_id = info->dma_tx_id;
+ dma_rx_id = info->dma_rx_id;
+ } else {
+ /* The driver assumes no error */
+ return 0;
+ }
+
+ /* The DMA engine uses the second register set, if present */
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+ if (!res)
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+
+ master = p->master;
+ master->dma_tx = sh_msiof_request_dma_chan(dev, DMA_MEM_TO_DEV,
+ dma_tx_id,
+ res->start + TFDR);
+ if (!master->dma_tx)
+ return -ENODEV;
+
+ master->dma_rx = sh_msiof_request_dma_chan(dev, DMA_DEV_TO_MEM,
+ dma_rx_id,
+ res->start + RFDR);
+ if (!master->dma_rx)
+ goto free_tx_chan;
+
+ p->tx_dma_page = (void *)__get_free_page(GFP_KERNEL | GFP_DMA);
+ if (!p->tx_dma_page)
+ goto free_rx_chan;
+
+ p->rx_dma_page = (void *)__get_free_page(GFP_KERNEL | GFP_DMA);
+ if (!p->rx_dma_page)
+ goto free_tx_page;
+
+ tx_dev = master->dma_tx->device->dev;
+ p->tx_dma_addr = dma_map_single(tx_dev, p->tx_dma_page, PAGE_SIZE,
+ DMA_TO_DEVICE);
+ if (dma_mapping_error(tx_dev, p->tx_dma_addr))
+ goto free_rx_page;
+
+ rx_dev = master->dma_rx->device->dev;
+ p->rx_dma_addr = dma_map_single(rx_dev, p->rx_dma_page, PAGE_SIZE,
+ DMA_FROM_DEVICE);
+ if (dma_mapping_error(rx_dev, p->rx_dma_addr))
+ goto unmap_tx_page;
+
+ dev_info(dev, "DMA available");
+ return 0;
+
+unmap_tx_page:
+ dma_unmap_single(tx_dev, p->tx_dma_addr, PAGE_SIZE, DMA_TO_DEVICE);
+free_rx_page:
+ free_page((unsigned long)p->rx_dma_page);
+free_tx_page:
+ free_page((unsigned long)p->tx_dma_page);
+free_rx_chan:
+ dma_release_channel(master->dma_rx);
+free_tx_chan:
+ dma_release_channel(master->dma_tx);
+ master->dma_tx = NULL;
+ return -ENODEV;
+}
+
+static void sh_msiof_release_dma(struct sh_msiof_spi_priv *p)
+{
+ struct spi_master *master = p->master;
+ struct device *dev;
+
+ if (!master->dma_tx)
+ return;
+
+ dev = &p->pdev->dev;
+ dma_unmap_single(master->dma_rx->device->dev, p->rx_dma_addr,
+ PAGE_SIZE, DMA_FROM_DEVICE);
+ dma_unmap_single(master->dma_tx->device->dev, p->tx_dma_addr,
+ PAGE_SIZE, DMA_TO_DEVICE);
+ free_page((unsigned long)p->rx_dma_page);
+ free_page((unsigned long)p->tx_dma_page);
+ dma_release_channel(master->dma_rx);
+ dma_release_channel(master->dma_tx);
+}
+
+static int sh_msiof_spi_probe(struct platform_device *pdev)
+{
+ struct resource *r;
+ struct spi_master *master;
+ const struct of_device_id *of_id;
+ struct sh_msiof_spi_priv *p;
+ int i;
+ int ret;
+
+ master = spi_alloc_master(&pdev->dev, sizeof(struct sh_msiof_spi_priv));
+ if (master == NULL) {
+ dev_err(&pdev->dev, "failed to allocate spi master\n");
+ return -ENOMEM;
+ }
+
+ p = spi_master_get_devdata(master);
+
+ platform_set_drvdata(pdev, p);
+ p->master = master;
+
+ of_id = of_match_device(sh_msiof_match, &pdev->dev);
+ if (of_id) {
+ p->chipdata = of_id->data;
+ p->info = sh_msiof_spi_parse_dt(&pdev->dev);
+ } else {
+ p->chipdata = (const void *)pdev->id_entry->driver_data;
+ p->info = dev_get_platdata(&pdev->dev);
+ }
+
+ if (!p->info) {
+ dev_err(&pdev->dev, "failed to obtain device info\n");
+ ret = -ENXIO;
+ goto err1;
+ }
+
+ init_completion(&p->done);
+
+ p->clk = devm_clk_get(&pdev->dev, NULL);
+ if (IS_ERR(p->clk)) {
+ dev_err(&pdev->dev, "cannot get clock\n");
+ ret = PTR_ERR(p->clk);
+ goto err1;
+ }
+
+ i = platform_get_irq(pdev, 0);
+ if (i < 0) {
+ dev_err(&pdev->dev, "cannot get platform IRQ\n");
+ ret = -ENOENT;
+ goto err1;
+ }
+
+ r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ p->mapbase = devm_ioremap_resource(&pdev->dev, r);
+ if (IS_ERR(p->mapbase)) {
+ ret = PTR_ERR(p->mapbase);
+ goto err1;
+ }
+
+ ret = devm_request_irq(&pdev->dev, i, sh_msiof_spi_irq, 0,
+ dev_name(&pdev->dev), p);
+ if (ret) {
+ dev_err(&pdev->dev, "unable to request irq\n");
+ goto err1;
+ }
+
+ p->pdev = pdev;
+ pm_runtime_enable(&pdev->dev);
+
+ /* Platform data may override FIFO sizes */
+ p->tx_fifo_size = p->chipdata->tx_fifo_size;
+ p->rx_fifo_size = p->chipdata->rx_fifo_size;
+ if (p->info->tx_fifo_override)
+ p->tx_fifo_size = p->info->tx_fifo_override;
+ if (p->info->rx_fifo_override)
+ p->rx_fifo_size = p->info->rx_fifo_override;
+
+ /* init master code */
+ master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH;
+ master->mode_bits |= SPI_LSB_FIRST | SPI_3WIRE;
+ master->flags = p->chipdata->master_flags;
+ master->bus_num = pdev->id;
+ master->dev.of_node = pdev->dev.of_node;
+ master->num_chipselect = p->info->num_chipselect;
+ master->setup = sh_msiof_spi_setup;
+ master->prepare_message = sh_msiof_prepare_message;
+ master->bits_per_word_mask = SPI_BPW_RANGE_MASK(8, 32);
+ master->auto_runtime_pm = true;
+ master->transfer_one = sh_msiof_transfer_one;
+
+ ret = sh_msiof_request_dma(p);
+ if (ret < 0)
+ dev_warn(&pdev->dev, "DMA not available, using PIO\n");
+
+ ret = devm_spi_register_master(&pdev->dev, master);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "spi_register_master error.\n");
+ goto err2;
+ }
+
+ return 0;
+
+ err2:
+ sh_msiof_release_dma(p);
+ pm_runtime_disable(&pdev->dev);
+ err1:
+ spi_master_put(master);
+ return ret;
+}
+
+static int sh_msiof_spi_remove(struct platform_device *pdev)
+{
+ struct sh_msiof_spi_priv *p = platform_get_drvdata(pdev);
+
+ sh_msiof_release_dma(p);
+ pm_runtime_disable(&pdev->dev);
+ return 0;
+}
+
+static struct platform_device_id spi_driver_ids[] = {
+ { "spi_sh_msiof", (kernel_ulong_t)&sh_data },
+ { "spi_r8a7790_msiof", (kernel_ulong_t)&r8a779x_data },
+ { "spi_r8a7791_msiof", (kernel_ulong_t)&r8a779x_data },
+ { "spi_r8a7792_msiof", (kernel_ulong_t)&r8a779x_data },
+ { "spi_r8a7793_msiof", (kernel_ulong_t)&r8a779x_data },
+ { "spi_r8a7794_msiof", (kernel_ulong_t)&r8a779x_data },
+ {},
+};
+MODULE_DEVICE_TABLE(platform, spi_driver_ids);
+
+static struct platform_driver sh_msiof_spi_drv = {
+ .probe = sh_msiof_spi_probe,
+ .remove = sh_msiof_spi_remove,
+ .id_table = spi_driver_ids,
+ .driver = {
+ .name = "spi_sh_msiof",
+ .of_match_table = of_match_ptr(sh_msiof_match),
+ },
+};
+module_platform_driver(sh_msiof_spi_drv);
+
+MODULE_DESCRIPTION("SuperH MSIOF SPI Master Interface Driver");
+MODULE_AUTHOR("Magnus Damm");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:spi_sh_msiof");
Code Review / kvmfornfv.git / blobdiff