+++ /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;
- ulong t;
-
- /* wait until device idle */
- for (t = get_timer(0); get_timer(t) < CONFIG_FTSSP010_TIMEOUT; ) {
- if (!(readl(®s->sr) & SR_BUSY))
- return 0;
- }
-
- puts("ftspi010: busy timeout\n");
-
- return -1;
-}
-
-static int ftssp010_wait_tx(struct ftssp010_spi *chip)
-{
- struct ftssp010_regs *regs = chip->regs;
- 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)
- return 0;
- }
-
- puts("ftssp010: tx timeout\n");
-
- return -1;
-}
-
-static int ftssp010_wait_rx(struct ftssp010_spi *chip)
-{
- struct ftssp010_regs *regs = chip->regs;
- 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)))
- return 0;
- }
-
- puts("ftssp010: rx timeout\n");
-
- return -1;
-}
-
-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)
-{
- struct ftssp010_spi *chip = to_ftssp010_spi(slave);
-
- free(chip);
-}
-
-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;
-}
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