--- /dev/null
+/*
+ * (C) Copyright 2013
+ * Faraday Technology Corporation. <http://www.faraday-tech.com/tw/>
+ * Kuo-Jung Su <dantesu@gmail.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <linux/compat.h>
+#include <asm/io.h>
+#include <malloc.h>
+#include <spi.h>
+
+#ifndef CONFIG_FTSSP010_BASE_LIST
+#define CONFIG_FTSSP010_BASE_LIST { CONFIG_FTSSP010_BASE }
+#endif
+
+#ifndef CONFIG_FTSSP010_GPIO_BASE
+#define CONFIG_FTSSP010_GPIO_BASE 0
+#endif
+
+#ifndef CONFIG_FTSSP010_GPIO_LIST
+#define CONFIG_FTSSP010_GPIO_LIST { CONFIG_FTSSP010_GPIO_BASE }
+#endif
+
+#ifndef CONFIG_FTSSP010_CLOCK
+#define CONFIG_FTSSP010_CLOCK clk_get_rate("SSP");
+#endif
+
+#ifndef CONFIG_FTSSP010_TIMEOUT
+#define CONFIG_FTSSP010_TIMEOUT 100
+#endif
+
+/* FTSSP010 chip registers */
+struct ftssp010_regs {
+ uint32_t cr[3];/* control register */
+ uint32_t sr; /* status register */
+ uint32_t icr; /* interrupt control register */
+ uint32_t isr; /* interrupt status register */
+ uint32_t dr; /* data register */
+ uint32_t rsvd[17];
+ uint32_t revr; /* revision register */
+ uint32_t fear; /* feature register */
+};
+
+/* Control Register 0 */
+#define CR0_FFMT_MASK (7 << 12)
+#define CR0_FFMT_SSP (0 << 12)
+#define CR0_FFMT_SPI (1 << 12)
+#define CR0_FFMT_MICROWIRE (2 << 12)
+#define CR0_FFMT_I2S (3 << 12)
+#define CR0_FFMT_AC97 (4 << 12)
+#define CR0_FLASH (1 << 11)
+#define CR0_FSDIST(x) (((x) & 0x03) << 8)
+#define CR0_LOOP (1 << 7) /* loopback mode */
+#define CR0_LSB (1 << 6) /* LSB */
+#define CR0_FSPO (1 << 5) /* fs atcive low (I2S only) */
+#define CR0_FSJUSTIFY (1 << 4)
+#define CR0_OPM_SLAVE (0 << 2)
+#define CR0_OPM_MASTER (3 << 2)
+#define CR0_OPM_I2S_MSST (3 << 2) /* master stereo mode */
+#define CR0_OPM_I2S_MSMO (2 << 2) /* master mono mode */
+#define CR0_OPM_I2S_SLST (1 << 2) /* slave stereo mode */
+#define CR0_OPM_I2S_SLMO (0 << 2) /* slave mono mode */
+#define CR0_SCLKPO (1 << 1) /* clock polarity */
+#define CR0_SCLKPH (1 << 0) /* clock phase */
+
+/* Control Register 1 */
+#define CR1_PDL(x) (((x) & 0xff) << 24) /* padding length */
+#define CR1_SDL(x) ((((x) - 1) & 0x1f) << 16) /* data length */
+#define CR1_DIV(x) (((x) - 1) & 0xffff) /* clock divider */
+
+/* Control Register 2 */
+#define CR2_CS(x) (((x) & 3) << 10) /* CS/FS select */
+#define CR2_FS (1 << 9) /* CS/FS signal level */
+#define CR2_TXEN (1 << 8) /* tx enable */
+#define CR2_RXEN (1 << 7) /* rx enable */
+#define CR2_RESET (1 << 6) /* chip reset */
+#define CR2_TXFC (1 << 3) /* tx fifo Clear */
+#define CR2_RXFC (1 << 2) /* rx fifo Clear */
+#define CR2_TXDOE (1 << 1) /* tx data output enable */
+#define CR2_EN (1 << 0) /* chip enable */
+
+/* Status Register */
+#define SR_RFF (1 << 0) /* rx fifo full */
+#define SR_TFNF (1 << 1) /* tx fifo not full */
+#define SR_BUSY (1 << 2) /* chip busy */
+#define SR_RFVE(reg) (((reg) >> 4) & 0x1f) /* rx fifo valid entries */
+#define SR_TFVE(reg) (((reg) >> 12) & 0x1f) /* tx fifo valid entries */
+
+/* Feature Register */
+#define FEAR_BITS(reg) ((((reg) >> 0) & 0xff) + 1) /* data width */
+#define FEAR_RFSZ(reg) ((((reg) >> 8) & 0xff) + 1) /* rx fifo size */
+#define FEAR_TFSZ(reg) ((((reg) >> 16) & 0xff) + 1) /* tx fifo size */
+#define FEAR_AC97 (1 << 24)
+#define FEAR_I2S (1 << 25)
+#define FEAR_SPI_MWR (1 << 26)
+#define FEAR_SSP (1 << 27)
+#define FEAR_SPDIF (1 << 28)
+
+/* FTGPIO010 chip registers */
+struct ftgpio010_regs {
+ uint32_t out; /* 0x00: Data Output */
+ uint32_t in; /* 0x04: Data Input */
+ uint32_t dir; /* 0x08: Direction */
+ uint32_t bypass; /* 0x0c: Bypass */
+ uint32_t set; /* 0x10: Data Set */
+ uint32_t clr; /* 0x14: Data Clear */
+ uint32_t pull_up; /* 0x18: Pull-Up Enabled */
+ uint32_t pull_st; /* 0x1c: Pull State (0=pull-down, 1=pull-up) */
+};
+
+struct ftssp010_gpio {
+ struct ftgpio010_regs *regs;
+ uint32_t pin;
+};
+
+struct ftssp010_spi {
+ struct spi_slave slave;
+ struct ftssp010_gpio gpio;
+ struct ftssp010_regs *regs;
+ uint32_t fifo;
+ uint32_t mode;
+ uint32_t div;
+ uint32_t clk;
+ uint32_t speed;
+ uint32_t revision;
+};
+
+static inline struct ftssp010_spi *to_ftssp010_spi(struct spi_slave *slave)
+{
+ return container_of(slave, struct ftssp010_spi, slave);
+}
+
+static int get_spi_chip(int bus, struct ftssp010_spi *chip)
+{
+ uint32_t fear, base[] = CONFIG_FTSSP010_BASE_LIST;
+
+ if (bus >= ARRAY_SIZE(base) || !base[bus])
+ return -1;
+
+ chip->regs = (struct ftssp010_regs *)base[bus];
+
+ chip->revision = readl(&chip->regs->revr);
+
+ fear = readl(&chip->regs->fear);
+ chip->fifo = min_t(uint32_t, FEAR_TFSZ(fear), FEAR_RFSZ(fear));
+
+ return 0;
+}
+
+static int get_spi_gpio(int bus, struct ftssp010_gpio *chip)
+{
+ uint32_t base[] = CONFIG_FTSSP010_GPIO_LIST;
+
+ if (bus >= ARRAY_SIZE(base) || !base[bus])
+ return -1;
+
+ chip->regs = (struct ftgpio010_regs *)(base[bus] & 0xfff00000);
+ chip->pin = base[bus] & 0x1f;
+
+ /* make it an output pin */
+ setbits_le32(&chip->regs->dir, 1 << chip->pin);
+
+ return 0;
+}
+
+static int ftssp010_wait(struct ftssp010_spi *chip)
+{
+ struct ftssp010_regs *regs = chip->regs;
+ int ret = -1;
+ ulong t;
+
+ /* wait until device idle */
+ for (t = get_timer(0); get_timer(t) < CONFIG_FTSSP010_TIMEOUT; ) {
+ if (readl(®s->sr) & SR_BUSY)
+ continue;
+ ret = 0;
+ break;
+ }
+
+ if (ret)
+ puts("ftspi010: busy timeout\n");
+
+ return ret;
+}
+
+static int ftssp010_wait_tx(struct ftssp010_spi *chip)
+{
+ struct ftssp010_regs *regs = chip->regs;
+ int ret = -1;
+ ulong t;
+
+ /* wait until tx fifo not full */
+ for (t = get_timer(0); get_timer(t) < CONFIG_FTSSP010_TIMEOUT; ) {
+ if (!(readl(®s->sr) & SR_TFNF))
+ continue;
+ ret = 0;
+ break;
+ }
+
+ if (ret)
+ puts("ftssp010: tx timeout\n");
+
+ return ret;
+}
+
+static int ftssp010_wait_rx(struct ftssp010_spi *chip)
+{
+ struct ftssp010_regs *regs = chip->regs;
+ int ret = -1;
+ ulong t;
+
+ /* wait until rx fifo not empty */
+ for (t = get_timer(0); get_timer(t) < CONFIG_FTSSP010_TIMEOUT; ) {
+ if (!SR_RFVE(readl(®s->sr)))
+ continue;
+ ret = 0;
+ break;
+ }
+
+ if (ret)
+ puts("ftssp010: rx timeout\n");
+
+ return ret;
+}
+
+static int ftssp010_spi_work_transfer_v2(struct ftssp010_spi *chip,
+ const void *tx_buf, void *rx_buf, int len, uint flags)
+{
+ struct ftssp010_regs *regs = chip->regs;
+ const uint8_t *txb = tx_buf;
+ uint8_t *rxb = rx_buf;
+
+ while (len > 0) {
+ int i, depth = min(chip->fifo >> 2, len);
+ uint32_t xmsk = 0;
+
+ if (tx_buf) {
+ for (i = 0; i < depth; ++i) {
+ ftssp010_wait_tx(chip);
+ writel(*txb++, ®s->dr);
+ }
+ xmsk |= CR2_TXEN | CR2_TXDOE;
+ if ((readl(®s->cr[2]) & xmsk) != xmsk)
+ setbits_le32(®s->cr[2], xmsk);
+ }
+ if (rx_buf) {
+ xmsk |= CR2_RXEN;
+ if ((readl(®s->cr[2]) & xmsk) != xmsk)
+ setbits_le32(®s->cr[2], xmsk);
+ for (i = 0; i < depth; ++i) {
+ ftssp010_wait_rx(chip);
+ *rxb++ = (uint8_t)readl(®s->dr);
+ }
+ }
+
+ len -= depth;
+ }
+
+ return 0;
+}
+
+static int ftssp010_spi_work_transfer_v1(struct ftssp010_spi *chip,
+ const void *tx_buf, void *rx_buf, int len, uint flags)
+{
+ struct ftssp010_regs *regs = chip->regs;
+ const uint8_t *txb = tx_buf;
+ uint8_t *rxb = rx_buf;
+
+ while (len > 0) {
+ int i, depth = min(chip->fifo >> 2, len);
+ uint32_t tmp;
+
+ for (i = 0; i < depth; ++i) {
+ ftssp010_wait_tx(chip);
+ writel(txb ? (*txb++) : 0, ®s->dr);
+ }
+ for (i = 0; i < depth; ++i) {
+ ftssp010_wait_rx(chip);
+ tmp = readl(®s->dr);
+ if (rxb)
+ *rxb++ = (uint8_t)tmp;
+ }
+
+ len -= depth;
+ }
+
+ return 0;
+}
+
+static void ftssp010_cs_set(struct ftssp010_spi *chip, int high)
+{
+ struct ftssp010_regs *regs = chip->regs;
+ struct ftssp010_gpio *gpio = &chip->gpio;
+ uint32_t mask;
+
+ /* cs pull high/low */
+ if (chip->revision >= 0x11900) {
+ mask = CR2_CS(chip->slave.cs) | (high ? CR2_FS : 0);
+ writel(mask, ®s->cr[2]);
+ } else if (gpio->regs) {
+ mask = 1 << gpio->pin;
+ if (high)
+ writel(mask, &gpio->regs->set);
+ else
+ writel(mask, &gpio->regs->clr);
+ }
+
+ /* extra delay for signal propagation */
+ udelay_masked(1);
+}
+
+/*
+ * Determine if a SPI chipselect is valid.
+ * This function is provided by the board if the low-level SPI driver
+ * needs it to determine if a given chipselect is actually valid.
+ *
+ * Returns: 1 if bus:cs identifies a valid chip on this board, 0
+ * otherwise.
+ */
+int spi_cs_is_valid(unsigned int bus, unsigned int cs)
+{
+ struct ftssp010_spi chip;
+
+ if (get_spi_chip(bus, &chip))
+ return 0;
+
+ if (!cs)
+ return 1;
+ else if ((cs < 4) && (chip.revision >= 0x11900))
+ return 1;
+
+ return 0;
+}
+
+/*
+ * Activate a SPI chipselect.
+ * This function is provided by the board code when using a driver
+ * that can't control its chipselects automatically (e.g.
+ * common/soft_spi.c). When called, it should activate the chip select
+ * to the device identified by "slave".
+ */
+void spi_cs_activate(struct spi_slave *slave)
+{
+ struct ftssp010_spi *chip = to_ftssp010_spi(slave);
+ struct ftssp010_regs *regs = chip->regs;
+
+ /* cs pull */
+ if (chip->mode & SPI_CS_HIGH)
+ ftssp010_cs_set(chip, 1);
+ else
+ ftssp010_cs_set(chip, 0);
+
+ /* chip enable + fifo clear */
+ setbits_le32(®s->cr[2], CR2_EN | CR2_TXFC | CR2_RXFC);
+}
+
+/*
+ * Deactivate a SPI chipselect.
+ * This function is provided by the board code when using a driver
+ * that can't control its chipselects automatically (e.g.
+ * common/soft_spi.c). When called, it should deactivate the chip
+ * select to the device identified by "slave".
+ */
+void spi_cs_deactivate(struct spi_slave *slave)
+{
+ struct ftssp010_spi *chip = to_ftssp010_spi(slave);
+
+ /* wait until chip idle */
+ ftssp010_wait(chip);
+
+ /* cs pull */
+ if (chip->mode & SPI_CS_HIGH)
+ ftssp010_cs_set(chip, 0);
+ else
+ ftssp010_cs_set(chip, 1);
+}
+
+void spi_init(void)
+{
+ /* nothing to do */
+}
+
+struct spi_slave *spi_setup_slave(uint bus, uint cs, uint max_hz, uint mode)
+{
+ struct ftssp010_spi *chip;
+
+ if (mode & SPI_3WIRE) {
+ puts("ftssp010: can't do 3-wire\n");
+ return NULL;
+ }
+
+ if (mode & SPI_SLAVE) {
+ puts("ftssp010: can't do slave mode\n");
+ return NULL;
+ }
+
+ if (mode & SPI_PREAMBLE) {
+ puts("ftssp010: can't skip preamble bytes\n");
+ return NULL;
+ }
+
+ if (!spi_cs_is_valid(bus, cs)) {
+ puts("ftssp010: invalid (bus, cs)\n");
+ return NULL;
+ }
+
+ chip = spi_alloc_slave(struct ftssp010_spi, bus, cs);
+ if (!chip)
+ return NULL;
+
+ if (get_spi_chip(bus, chip))
+ goto free_out;
+
+ if (chip->revision < 0x11900 && get_spi_gpio(bus, &chip->gpio)) {
+ puts("ftssp010: Before revision 1.19.0, its clock & cs are\n"
+ "controlled by tx engine which is not synced with rx engine,\n"
+ "so the clock & cs might be shutdown before rx engine\n"
+ "finishs its jobs.\n"
+ "If possible, please add a dedicated gpio for it.\n");
+ }
+
+ chip->mode = mode;
+ chip->clk = CONFIG_FTSSP010_CLOCK;
+ chip->div = 2;
+ if (max_hz) {
+ while (chip->div < 0xffff) {
+ if ((chip->clk / (2 * chip->div)) <= max_hz)
+ break;
+ chip->div += 1;
+ }
+ }
+ chip->speed = chip->clk / (2 * chip->div);
+
+ return &chip->slave;
+
+free_out:
+ free(chip);
+ return NULL;
+}
+
+void spi_free_slave(struct spi_slave *slave)
+{
+ free(slave);
+}
+
+int spi_claim_bus(struct spi_slave *slave)
+{
+ struct ftssp010_spi *chip = to_ftssp010_spi(slave);
+ struct ftssp010_regs *regs = chip->regs;
+
+ writel(CR1_SDL(8) | CR1_DIV(chip->div), ®s->cr[1]);
+
+ if (chip->revision >= 0x11900) {
+ writel(CR0_OPM_MASTER | CR0_FFMT_SPI | CR0_FSPO | CR0_FLASH,
+ ®s->cr[0]);
+ writel(CR2_TXFC | CR2_RXFC,
+ ®s->cr[2]);
+ } else {
+ writel(CR0_OPM_MASTER | CR0_FFMT_SPI | CR0_FSPO,
+ ®s->cr[0]);
+ writel(CR2_TXFC | CR2_RXFC | CR2_EN | CR2_TXDOE,
+ ®s->cr[2]);
+ }
+
+ if (chip->mode & SPI_LOOP)
+ setbits_le32(®s->cr[0], CR0_LOOP);
+
+ if (chip->mode & SPI_CPOL)
+ setbits_le32(®s->cr[0], CR0_SCLKPO);
+
+ if (chip->mode & SPI_CPHA)
+ setbits_le32(®s->cr[0], CR0_SCLKPH);
+
+ spi_cs_deactivate(slave);
+
+ return 0;
+}
+
+void spi_release_bus(struct spi_slave *slave)
+{
+ struct ftssp010_spi *chip = to_ftssp010_spi(slave);
+ struct ftssp010_regs *regs = chip->regs;
+
+ writel(0, ®s->cr[2]);
+}
+
+int spi_xfer(struct spi_slave *slave, unsigned int bitlen,
+ const void *dout, void *din, unsigned long flags)
+{
+ struct ftssp010_spi *chip = to_ftssp010_spi(slave);
+ uint32_t len = bitlen >> 3;
+
+ if (flags & SPI_XFER_BEGIN)
+ spi_cs_activate(slave);
+
+ if (chip->revision >= 0x11900)
+ ftssp010_spi_work_transfer_v2(chip, dout, din, len, flags);
+ else
+ ftssp010_spi_work_transfer_v1(chip, dout, din, len, flags);
+
+ if (flags & SPI_XFER_END)
+ spi_cs_deactivate(slave);
+
+ return 0;
+}
Code Review / kvmfornfv.git / blobdiff