--- /dev/null
+/*
+ * drivers/amlogic/spicc/spicc.c
+ *
+ * Copyright (C) 2017 Amlogic, Inc. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/device.h>
+#include <linux/delay.h>
+#include <linux/dma-mapping.h>
+#include <linux/platform_device.h>
+#include <linux/err.h>
+#include <linux/clk.h>
+#include <linux/io.h>
+#include <linux/spi/spi.h>
+#include <linux/of_address.h>
+#include <linux/amlogic/aml_gpio_consumer.h>
+#include <linux/of.h>
+#include <linux/reset.h>
+#include <linux/dma-mapping.h>
+#include <linux/dmaengine.h>
+#include <linux/of_irq.h>
+#include "spicc.h"
+
+/* #define CONFIG_SPICC_LOG */
+#ifdef CONFIG_SPICC_LOG
+struct my_log {
+ struct timeval tv;
+ unsigned int irq_data;
+ unsigned int reg_val[13];
+ unsigned int param[8];
+ unsigned int param_count;
+ const char *comment;
+};
+#endif
+
+/**
+ * struct spicc
+ * @lock: spinlock for SPICC controller.
+ * @msg_queue: link with the spi message list.
+ * @wq: work queque
+ * @work: work
+ * @master: spi master alloc for this driver.
+ * @spi: spi device on working.
+ * @regs: the start register address of this SPICC controller.
+ */
+struct spicc {
+ spinlock_t lock;
+ struct list_head msg_queue;
+ struct workqueue_struct *wq;
+ struct work_struct work;
+ struct spi_master *master;
+ struct spi_device *spi;
+ struct class cls;
+
+ int device_id;
+ struct reset_control *rst;
+ struct clk *clk;
+ void __iomem *regs;
+ struct pinctrl *pinctrl;
+ struct pinctrl_state *pullup;
+ struct pinctrl_state *pulldown;
+ int bits_per_word;
+ int mode;
+ int speed;
+ unsigned int dma_tx_threshold;
+ unsigned int dma_rx_threshold;
+ unsigned int dma_num_per_read_burst;
+ unsigned int dma_num_per_write_burst;
+ int irq;
+ struct completion completion;
+#define FLAG_DMA_EN 0
+#define FLAG_TEST_DATA_AUTO_INC 1
+#define FLAG_SSCTL 2
+#define FLAG_ENHANCE 3
+ unsigned int flags;
+ u8 test_data;
+ unsigned int delay_control;
+ unsigned int cs_delay;
+ int remain;
+ u8 *txp;
+ u8 *rxp;
+ int burst_len;
+#ifdef CONFIG_SPICC_LOG
+ struct my_log *log;
+ int log_size;
+ int log_count;
+#endif
+};
+
+#ifdef CONFIG_SPICC_LOG
+enum {
+ PROBE_BEGIN,
+ PROBE_END,
+ REQUEST_IRQ,
+ HAND_MSG_BEGIN,
+ HAND_MSG_END,
+ XFER_COMP_ISR,
+ XFER_COMP_POLLING,
+ DMA_BEGIN,
+ DMA_END,
+ PIO_BEGIN,
+ PIO_END,
+};
+
+static const char * const log_comment[] = {
+ "probe begin",
+ "probe end",
+ "request irq",
+ "handle msg begin",
+ "handle msg end",
+ "xfer complete isr",
+ "xfer complete polling",
+ "dma begin",
+ "dma end",
+ "pio begin",
+ "pio end"
+};
+
+static void spicc_log_init(struct spicc *spicc)
+{
+ spicc->log = 0;
+ spicc->log_count = 0;
+ if (spicc->log_size)
+ spicc->log = kzalloc(spicc->log_size *
+ sizeof(struct my_log), GFP_KERNEL);
+ pr_info("spicc: log_size=%d, log=%p",
+ spicc->log_size, spicc->log);
+}
+
+static void spicc_log_exit(struct spicc *spicc)
+{
+ spicc->log = 0;
+ spicc->log_count = 0;
+ spicc->log_size = 0;
+ kfree(spicc->log);
+}
+
+static void spicc_log(
+ struct spicc *spicc,
+ unsigned int *param,
+ int param_count,
+ int comment_id)
+{
+ struct my_log *log;
+ struct irq_desc *desc;
+ int i;
+
+ if (IS_ERR_OR_NULL(spicc->log))
+ return;
+ log = &spicc->log[spicc->log_count];
+ log->tv = ktime_to_timeval(ktime_get());
+ if (spicc->irq) {
+ desc = irq_to_desc(spicc->irq);
+ log->irq_data = desc->irq_data.state_use_accessors;
+ }
+ for (i = 0; i < ARRAY_SIZE(log->reg_val); i++)
+ log->reg_val[i] = readl(spicc->regs + ((i+2)<<2));
+
+ if (param) {
+ if (param_count > ARRAY_SIZE(log->param))
+ param_count = ARRAY_SIZE(log->param);
+ for (i = 0; i < param_count; i++)
+ log->param[i] = param[i];
+ log->param_count = param_count;
+ }
+ log->comment = log_comment[comment_id];
+
+ if (++spicc->log_count > spicc->log_size)
+ spicc->log_count = 0;
+}
+
+static void spicc_log_print(struct spicc *spicc)
+{
+ struct my_log *log;
+ int i, j;
+ unsigned int *p;
+
+ if (IS_ERR_OR_NULL(spicc->log))
+ return;
+ pr_info("log total:%d\n", spicc->log_count);
+ for (i = 0; i < spicc->log_count; i++) {
+ log = &spicc->log[i];
+ pr_info("[%6u.%6u]spicc-%d: %s\n",
+ (unsigned int)log->tv.tv_sec,
+ (unsigned int)log->tv.tv_usec,
+ i, log->comment);
+ pr_info("irq_data=0x%x\n", log->irq_data);
+ p = log->reg_val;
+ for (j = 0; j < ARRAY_SIZE(log->reg_val); j++)
+ if (*p)
+ pr_info("reg[%2d]=0x%x\n", j+2, *p++);
+ p = log->param;
+ for (j = 0; j < log->param_count; j++)
+ pr_info("param[%d]=0x%x\n", j, *p++);
+ }
+}
+#else
+#define spicc_log_init(spicc)
+#define spicc_log_exit(spicc)
+#define spicc_log(spicc, param, param_count, comment_id)
+#define spicc_log_print(spicc)
+#endif
+
+/* Note this is chip_select enable or disable */
+void spicc_chip_select(struct spi_device *spi, bool select)
+{
+ struct spicc *spicc;
+ unsigned int level;
+
+ spicc = spi_master_get_devdata(spi->master);
+ level = (spi->mode & SPI_CS_HIGH) ? select : !select;
+
+ if (spi->mode & SPI_NO_CS)
+ return;
+ if (spi->cs_gpio >= 0) {
+ gpio_direction_output(spi->cs_gpio, level);
+ } else if (select) {
+ setb(spicc->regs, CON_CHIP_SELECT, spi->chip_select);
+ setb(spicc->regs, CON_SS_POL, level);
+ }
+}
+EXPORT_SYMBOL(spicc_chip_select);
+
+static inline bool spicc_get_flag(struct spicc *spicc, unsigned int flag)
+{
+ bool ret;
+
+ ret = (spicc->flags >> flag) & 1;
+ return ret;
+}
+
+static inline void spicc_set_flag(
+ struct spicc *spicc,
+ unsigned int flag,
+ bool value)
+{
+ if (value)
+ spicc->flags |= 1<<flag;
+ else
+ spicc->flags &= ~(1<<flag);
+}
+
+static inline void spicc_set_bit_width(struct spicc *spicc, u8 bw)
+{
+ setb(spicc->regs, CON_BITS_PER_WORD, bw-1);
+ spicc->bits_per_word = bw;
+}
+
+static void spicc_set_mode(struct spicc *spicc, u8 mode)
+{
+ bool cpol = (mode & SPI_CPOL) ? 1:0;
+ bool cpha = (mode & SPI_CPHA) ? 1:0;
+
+ if (mode == spicc->mode)
+ return;
+
+ spicc->mode = mode;
+ if (!spicc_get_flag(spicc, FLAG_ENHANCE)) {
+ if (cpol && !IS_ERR_OR_NULL(spicc->pullup))
+ pinctrl_select_state(spicc->pinctrl, spicc->pullup);
+ else if (!cpol && !IS_ERR_OR_NULL(spicc->pulldown))
+ pinctrl_select_state(spicc->pinctrl, spicc->pulldown);
+ }
+ setb(spicc->regs, CON_CLK_PHA, cpha);
+ setb(spicc->regs, CON_CLK_POL, cpol);
+}
+
+static void spicc_set_clk(struct spicc *spicc, int speed)
+{
+ unsigned int sys_clk_rate;
+ unsigned int div, mid_speed;
+
+ if (!speed)
+ clk_disable_unprepare(spicc->clk);
+ else
+ clk_prepare_enable(spicc->clk);
+ if (!speed || (speed == spicc->speed))
+ return;
+
+ spicc->speed = speed;
+ sys_clk_rate = clk_get_rate(spicc->clk);
+
+ if (spicc_get_flag(spicc, FLAG_ENHANCE)) {
+ div = (sys_clk_rate/speed)-1;
+ setb(spicc->regs, ENHANCE_CLK_DIV, div);
+ setb(spicc->regs, ENHANCE_CLK_DIV_SELECT, 1);
+ } else {
+ /* speed = sys_clk_rate / 2^(conreg.data_rate_div+2) */
+ mid_speed = (sys_clk_rate * 3) >> 4;
+ for (div = 0; div < 7; div++) {
+ if (speed >= mid_speed)
+ break;
+ mid_speed >>= 1;
+ }
+ setb(spicc->regs, CON_DATA_RATE_DIV, div);
+ }
+}
+
+static inline void spicc_set_txfifo(struct spicc *spicc, u32 dat)
+{
+ writel(dat, spicc->regs + SPICC_REG_TXDATA);
+}
+
+static inline u32 spicc_get_rxfifo(struct spicc *spicc)
+{
+ return readl(spicc->regs + SPICC_REG_RXDATA);
+}
+
+static inline void spicc_enable(struct spicc *spicc, bool en)
+{
+ setb(spicc->regs, CON_ENABLE, en);
+}
+
+static void dma_one_burst(struct spicc *spicc)
+{
+ void __iomem *mem_base = spicc->regs;
+
+ setb(mem_base, STA_XFER_COM, 1);
+ if (spicc->remain > 0) {
+ spicc->burst_len = min_t(size_t, spicc->remain, BURST_LEN_MAX);
+ setb(mem_base, CON_BURST_LEN, spicc->burst_len - 1);
+ setb(mem_base, CON_XCH, 1);
+ spicc->remain -= spicc->burst_len;
+ }
+}
+
+static void pio_one_burst_recv(struct spicc *spicc)
+{
+ int bytes_per_word;
+ unsigned int dat;
+ int i, j;
+
+ bytes_per_word = ((spicc->bits_per_word - 1)>>3) + 1;
+ for (i = 0; i < spicc->burst_len; i++) {
+ dat = spicc_get_rxfifo(spicc);
+ if (spicc->rxp) {
+ for (j = 0; j < bytes_per_word; j++) {
+ *spicc->rxp++ = dat & 0xff;
+ dat >>= 8;
+ }
+ }
+ }
+}
+
+static void pio_one_burst_send(struct spicc *spicc)
+{
+ void __iomem *mem_base = spicc->regs;
+ int bytes_per_word;
+ unsigned int dat;
+ int i, j;
+
+ setb(mem_base, STA_XFER_COM, 1);
+ bytes_per_word = ((spicc->bits_per_word - 1)>>3) + 1;
+ if (spicc->remain > 0) {
+ spicc->burst_len = min_t(size_t, spicc->remain,
+ SPICC_FIFO_SIZE);
+ for (i = 0; i < spicc->burst_len; i++) {
+ dat = 0;
+ if (spicc->txp) {
+ for (j = 0; j < bytes_per_word; j++) {
+ dat <<= 8;
+ dat += *spicc->txp++;
+ }
+ }
+ spicc_set_txfifo(spicc, dat);
+ }
+ setb(mem_base, CON_BURST_LEN, spicc->burst_len - 1);
+ setb(mem_base, CON_XCH, 1);
+ spicc->remain -= spicc->burst_len;
+ }
+}
+
+/**
+ * Return: same with wait_for_completion_interruptible_timeout
+ * =0: timed out,
+ * >0: completed, number of usec left till timeout.
+ */
+static int spicc_wait_complete(struct spicc *spicc, int us)
+{
+ void __iomem *mem_base = spicc->regs;
+ int i;
+
+ for (i = 0; i < us; i++) {
+ udelay(1);
+ if (getb(mem_base, STA_XFER_COM)) {
+ setb(spicc->regs, STA_XFER_COM, 1); /* set 1 to clear */
+ break;
+ }
+ }
+ return us - i;
+}
+
+static irqreturn_t spicc_xfer_complete_isr(int irq, void *dev_id)
+{
+ struct spicc *spicc = (struct spicc *)dev_id;
+ unsigned long flags;
+
+ spin_lock_irqsave(&spicc->lock, flags);
+ spicc_wait_complete(spicc, 100);
+ spicc_log(spicc, &spicc->remain, 1, XFER_COMP_ISR);
+ if (!spicc_get_flag(spicc, FLAG_DMA_EN))
+ pio_one_burst_recv(spicc);
+ if (!spicc->remain)
+ complete(&spicc->completion);
+ else if (spicc_get_flag(spicc, FLAG_DMA_EN))
+ dma_one_burst(spicc);
+ else
+ pio_one_burst_send(spicc);
+ spin_unlock_irqrestore(&spicc->lock, flags);
+ return IRQ_HANDLED;
+}
+
+#define INVALID_DMA_ADDRESS 0xffffffff
+/*
+ * For DMA, tx_buf/tx_dma have the same relationship as rx_buf/rx_dma:
+ * - The buffer is either valid for CPU access, else NULL
+ * - If the buffer is valid, so is its DMA address
+ *
+ * This driver manages the dma address unless message->is_dma_mapped.
+ */
+static int spicc_dma_map(struct spicc *spicc, struct spi_transfer *t)
+{
+ struct device *dev = spicc->master->dev.parent;
+ u8 buf[8], *p = (u8 *)t->tx_buf;
+ int i, len = 0;
+
+ t->tx_dma = t->rx_dma = INVALID_DMA_ADDRESS;
+ if (t->tx_buf) {
+ while (len < t->len) {
+ memcpy(buf, p, 8);
+ for (i = 0; i < 8; i++)
+ *p++ = buf[7-i];
+ len += 8;
+ }
+ t->tx_dma = dma_map_single(dev,
+ (void *)t->tx_buf, t->len, DMA_TO_DEVICE);
+ if (dma_mapping_error(dev, t->tx_dma)) {
+ dev_err(dev, "tx_dma map failed\n");
+ return -ENOMEM;
+ }
+ }
+ if (t->rx_buf) {
+ t->rx_dma = dma_map_single(dev,
+ t->rx_buf, t->len, DMA_FROM_DEVICE);
+ if (dma_mapping_error(dev, t->rx_dma)) {
+ if (t->tx_buf) {
+ dev_err(dev, "rx_dma map failed\n");
+ dma_unmap_single(dev, t->tx_dma, t->len,
+ DMA_TO_DEVICE);
+ }
+ return -ENOMEM;
+ }
+ }
+ return 0;
+}
+
+static void spicc_dma_unmap(struct spicc *spicc, struct spi_transfer *t)
+{
+ struct device *dev = spicc->master->dev.parent;
+ u8 buf[8], *p = (u8 *)t->rx_buf;
+ int i, len = 0;
+
+ if (t->tx_dma != INVALID_DMA_ADDRESS)
+ dma_unmap_single(dev, t->tx_dma, t->len, DMA_TO_DEVICE);
+ if (t->rx_dma != INVALID_DMA_ADDRESS) {
+ dma_unmap_single(dev, t->rx_dma, t->len, DMA_FROM_DEVICE);
+ while (len < t->len) {
+ memcpy(buf, p, 8);
+ for (i = 0; i < 8; i++)
+ *p++ = buf[7-i];
+ len += 8;
+ }
+ }
+}
+
+/**
+ * Return:
+ * =0: xfer success,
+ * -ETIMEDOUT: timeout.
+ */
+static int spicc_dma_xfer(struct spicc *spicc, struct spi_transfer *t)
+{
+ void __iomem *mem_base = spicc->regs;
+ int ret;
+
+ setb(mem_base, RX_FIFO_RESET, 1);
+ setb(mem_base, TX_FIFO_RESET, 1);
+ setb(mem_base, CON_XCH, 0);
+ spicc_set_bit_width(spicc, 64);
+ if (t->tx_dma != INVALID_DMA_ADDRESS)
+ writel(t->tx_dma, mem_base + SPICC_REG_DRADDR);
+ if (t->rx_dma != INVALID_DMA_ADDRESS)
+ writel(t->rx_dma, mem_base + SPICC_REG_DWADDR);
+ setb(mem_base, DMA_EN, 1);
+ spicc->remain = ((t->len - 1) >> 3) + 1;
+ spicc->burst_len = 0;
+ spicc_log(spicc, &spicc->remain, 1, DMA_BEGIN);
+ if (spicc->irq) {
+ setb(mem_base, INT_XFER_COM_EN, 1);
+ enable_irq(spicc->irq);
+ dma_one_burst(spicc);
+ ret = wait_for_completion_interruptible_timeout(
+ &spicc->completion, msecs_to_jiffies(2000));
+ disable_irq_nosync(spicc->irq);
+ setb(mem_base, INT_XFER_COM_EN, 0);
+ } else {
+ while (spicc->remain) {
+ dma_one_burst(spicc);
+ ret = spicc_wait_complete(spicc,
+ spicc->burst_len << 13);
+ spicc_log(spicc, &spicc->remain, 1, XFER_COMP_POLLING);
+ if (!ret)
+ break;
+ }
+ }
+ setb(mem_base, DMA_EN, 0);
+ ret = ret ? 0 : -ETIMEDOUT;
+ spicc_log(spicc, &ret, 1, DMA_END);
+ return ret;
+}
+
+/**
+ * Return:
+ * =0: xfer success,
+ * -ETIMEDOUT: timeout.
+ */
+static int spicc_hw_xfer(struct spicc *spicc, u8 *txp, u8 *rxp, int len)
+{
+ void __iomem *mem_base = spicc->regs;
+ int bytes_per_word;
+ int ret;
+
+ setb(mem_base, RX_FIFO_RESET, 1);
+ setb(mem_base, TX_FIFO_RESET, 1);
+ setb(mem_base, CON_XCH, 0);
+ bytes_per_word = ((spicc->bits_per_word - 1)>>3) + 1;
+ spicc->remain = len / bytes_per_word;
+ spicc->txp = txp;
+ spicc->rxp = rxp;
+ spicc_log(spicc, &spicc->remain, 1, PIO_BEGIN);
+ if (spicc->irq) {
+ setb(mem_base, INT_XFER_COM_EN, 1);
+ enable_irq(spicc->irq);
+ pio_one_burst_send(spicc);
+ ret = wait_for_completion_interruptible_timeout(
+ &spicc->completion, msecs_to_jiffies(2000));
+ disable_irq_nosync(spicc->irq);
+ setb(mem_base, INT_XFER_COM_EN, 0);
+ } else {
+ while (spicc->remain) {
+ pio_one_burst_send(spicc);
+ ret = spicc_wait_complete(spicc,
+ spicc->burst_len << 10);
+ spicc_log(spicc, &spicc->remain, 1, XFER_COMP_POLLING);
+ if (!ret)
+ break;
+ pio_one_burst_recv(spicc);
+ }
+ }
+ ret = ret ? 0 : -ETIMEDOUT;
+ spicc_log(spicc, &ret, 1, PIO_END);
+ return ret;
+}
+
+static void spicc_hw_init(struct spicc *spicc)
+{
+ void __iomem *mem_base = spicc->regs;
+
+ spicc->bits_per_word = -1;
+ spicc->mode = -1;
+ spicc->speed = -1;
+ spicc_enable(spicc, 0);
+ setb(mem_base, CLK_FREE_EN, 1);
+ setb(mem_base, CON_MODE, 1); /* 0-slave, 1-master */
+ setb(mem_base, CON_XCH, 0);
+ setb(mem_base, CON_SMC, 0);
+ setb(mem_base, CON_SS_CTL, spicc_get_flag(spicc, FLAG_SSCTL));
+ setb(mem_base, CON_DRCTL, 0);
+ spicc_enable(spicc, 1);
+ setb(mem_base, DELAY_CONTROL, spicc->delay_control);
+ writel((0x00<<26 |
+ 0x00<<20 |
+ 0x0<<19 |
+ spicc->dma_num_per_write_burst<<15 |
+ spicc->dma_num_per_read_burst<<11 |
+ spicc->dma_rx_threshold<<6 |
+ spicc->dma_tx_threshold<<1 |
+ 0x0<<0),
+ mem_base + SPICC_REG_DMA);
+ spicc_set_bit_width(spicc, SPICC_DEFAULT_BIT_WIDTH);
+ spicc_set_mode(spicc, SPI_MODE_0);
+ spicc_set_clk(spicc, SPICC_DEFAULT_SPEED_HZ);
+ if (spicc_get_flag(spicc, FLAG_ENHANCE)) {
+ setb(spicc->regs, MOSI_OEN, 1);
+ setb(spicc->regs, CLK_OEN, 1);
+ setb(mem_base, CS_OEN, 1);
+ setb(mem_base, CS_DELAY, spicc->cs_delay);
+ setb(mem_base, CS_DELAY_EN, 1);
+ }
+ /* spicc_enable(spicc, 0); */
+}
+
+
+int dirspi_xfer(struct spi_device *spi, u8 *tx_buf, u8 *rx_buf, int len)
+{
+ struct spicc *spicc;
+
+ spicc = spi_master_get_devdata(spi->master);
+ return spicc_hw_xfer(spicc, tx_buf, rx_buf, len);
+}
+EXPORT_SYMBOL(dirspi_xfer);
+
+int dirspi_write(struct spi_device *spi, u8 *buf, int len)
+{
+ struct spicc *spicc;
+
+ spicc = spi_master_get_devdata(spi->master);
+ return spicc_hw_xfer(spicc, buf, 0, len);
+}
+EXPORT_SYMBOL(dirspi_write);
+
+int dirspi_read(struct spi_device *spi, u8 *buf, int len)
+{
+ struct spicc *spicc;
+
+ spicc = spi_master_get_devdata(spi->master);
+ return spicc_hw_xfer(spicc, 0, buf, len);
+}
+EXPORT_SYMBOL(dirspi_read);
+
+void dirspi_start(struct spi_device *spi)
+{
+ spicc_chip_select(spi, 1);
+}
+EXPORT_SYMBOL(dirspi_start);
+
+void dirspi_stop(struct spi_device *spi)
+{
+ spicc_chip_select(spi, 0);
+}
+EXPORT_SYMBOL(dirspi_stop);
+
+
+/* setting clock and pinmux here */
+static int spicc_setup(struct spi_device *spi)
+{
+ struct spicc *spicc;
+
+ spicc = spi_master_get_devdata(spi->master);
+ if (spi->cs_gpio >= 0)
+ gpio_request(spi->cs_gpio, "spicc");
+ dev_info(&spi->dev, "chip_select=%d cs_gpio=%d mode=%d speed=%d\n",
+ spi->chip_select, spi->cs_gpio,
+ spi->mode, spi->max_speed_hz);
+ spicc_chip_select(spi, 0);
+ return 0;
+}
+
+static void spicc_cleanup(struct spi_device *spi)
+{
+ spicc_chip_select(spi, 0);
+ if (spi->cs_gpio >= 0)
+ gpio_free(spi->cs_gpio);
+}
+
+static void spicc_handle_one_msg(struct spicc *spicc, struct spi_message *m)
+{
+ struct spi_device *spi = m->spi;
+ struct spi_transfer *t;
+ int ret = 0;
+ bool cs_changed = 0;
+
+ spicc_log(spicc, 0, 0, HAND_MSG_BEGIN);
+ /* spicc_enable(spicc, 1); */
+ if (spi) {
+ spicc_set_bit_width(spicc,
+ spi->bits_per_word ? : SPICC_DEFAULT_BIT_WIDTH);
+ spicc_set_clk(spicc,
+ spi->max_speed_hz ? : SPICC_DEFAULT_SPEED_HZ);
+ spicc_set_mode(spicc, spi->mode);
+ spicc_chip_select(spi, 1);
+ }
+ list_for_each_entry(t, &m->transfers, transfer_list) {
+ if (t->bits_per_word)
+ spicc_set_bit_width(spicc, t->bits_per_word);
+ if (t->speed_hz)
+ spicc_set_clk(spicc, t->speed_hz);
+ if (spi && cs_changed) {
+ spicc_chip_select(spi, 1);
+ cs_changed = 0;
+ }
+ if (t->delay_usecs >> 10)
+ udelay(t->delay_usecs >> 10);
+
+ if (spicc_get_flag(spicc, FLAG_DMA_EN)) {
+ if (!m->is_dma_mapped)
+ spicc_dma_map(spicc, t);
+ ret = spicc_dma_xfer(spicc, t);
+ if (!m->is_dma_mapped)
+ spicc_dma_unmap(spicc, t);
+ } else {
+ ret = spicc_hw_xfer(spicc, (u8 *)t->tx_buf,
+ (u8 *)t->rx_buf, t->len);
+ }
+ if (ret)
+ goto spicc_handle_end;
+ m->actual_length += t->len;
+
+ /*
+ * to delay after this transfer before
+ * (optionally) changing the chipselect status.
+ */
+ if (t->delay_usecs & 0x3ff)
+ udelay(t->delay_usecs & 0x3ff);
+ if (spi && t->cs_change) {
+ spicc_chip_select(spi, 0);
+ cs_changed = 1;
+ }
+ }
+
+spicc_handle_end:
+ if (spi)
+ spicc_chip_select(spi, 0);
+ /* spicc_enable(spicc, 0); */
+ m->status = ret;
+ if (m->context)
+ m->complete(m->context);
+ spicc_log(spicc, 0, 0, HAND_MSG_END);
+}
+
+static int spicc_transfer(struct spi_device *spi, struct spi_message *m)
+{
+ struct spicc *spicc = spi_master_get_devdata(spi->master);
+ unsigned long flags;
+
+ m->actual_length = 0;
+ m->status = -EINPROGRESS;
+
+ spin_lock_irqsave(&spicc->lock, flags);
+ list_add_tail(&m->queue, &spicc->msg_queue);
+ queue_work(spicc->wq, &spicc->work);
+ spin_unlock_irqrestore(&spicc->lock, flags);
+
+ return 0;
+}
+
+static void spicc_work(struct work_struct *work)
+{
+ struct spicc *spicc = container_of(work, struct spicc, work);
+ struct spi_message *m;
+ unsigned long flags;
+
+ spin_lock_irqsave(&spicc->lock, flags);
+ while (!list_empty(&spicc->msg_queue)) {
+ m = container_of(spicc->msg_queue.next,
+ struct spi_message, queue);
+ list_del_init(&m->queue);
+ spin_unlock_irqrestore(&spicc->lock, flags);
+ spicc_handle_one_msg(spicc, m);
+ spin_lock_irqsave(&spicc->lock, flags);
+ }
+ spin_unlock_irqrestore(&spicc->lock, flags);
+}
+
+static ssize_t show_setting(struct class *class,
+ struct class_attribute *attr, char *buf)
+{
+ int ret = 0;
+ struct spicc *spicc = container_of(class, struct spicc, cls);
+
+ if (!strcmp(attr->attr.name, "speed"))
+ ret = sprintf(buf, "speed=%d\n", spicc->speed);
+ else if (!strcmp(attr->attr.name, "mode"))
+ ret = sprintf(buf, "mode=%d\n", spicc->mode);
+ else if (!strcmp(attr->attr.name, "bit_width"))
+ ret = sprintf(buf, "bit_width=%d\n", spicc->bits_per_word);
+ else if (!strcmp(attr->attr.name, "flags"))
+ ret = sprintf(buf, "flags=0x%x\n", spicc->flags);
+ else if (!strcmp(attr->attr.name, "test_data"))
+ ret = sprintf(buf, "test_data=0x%x\n", spicc->test_data);
+ else if (!strcmp(attr->attr.name, "help")) {
+ pr_info("SPI device test help\n");
+ pr_info("echo cs_gpio speed mode bits_per_word num");
+ pr_info("[wbyte1 wbyte2...] >test\n");
+ }
+#ifdef CONFIG_SPICC_LOG
+ else if (!strcmp(attr->attr.name, "log")) {
+ spicc_log_print(spicc);
+ spicc->log_count = 0;
+ }
+#endif
+ return ret;
+}
+
+
+static ssize_t store_setting(
+ struct class *class,
+ struct class_attribute *attr,
+ const char *buf, size_t count)
+{
+ long value;
+ struct spicc *spicc = container_of(class, struct spicc, cls);
+
+ if (kstrtol(buf, 0, &value))
+ return -EINVAL;
+ if (!strcmp(attr->attr.name, "speed"))
+ spicc_set_clk(spicc, value);
+ else if (!strcmp(attr->attr.name, "mode"))
+ spicc_set_mode(spicc, value);
+ else if (!strcmp(attr->attr.name, "bit_width"))
+ spicc_set_bit_width(spicc, value);
+ else if (!strcmp(attr->attr.name, "flags"))
+ spicc->flags = value;
+ else if (!strcmp(attr->attr.name, "test_data"))
+ spicc->test_data = (u8)(value & 0xff);
+ return count;
+}
+
+static ssize_t store_test(
+ struct class *class,
+ struct class_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct spicc *spicc = container_of(class, struct spicc, cls);
+ struct device *dev = spicc->master->dev.parent;
+ unsigned int cs_gpio, speed, mode, bits_per_word, num;
+ u8 *tx_buf, *rx_buf;
+ unsigned long value;
+ char *kstr, *str_temp, *token;
+ int i;
+ struct spi_transfer t;
+ struct spi_message m;
+
+ if (sscanf(buf, "%d%d%d%d%d", &cs_gpio, &speed,
+ &mode, &bits_per_word, &num) != 5) {
+ dev_err(dev, "error test data\n");
+ return count;
+ }
+ kstr = kstrdup(buf, GFP_KERNEL);
+ tx_buf = kzalloc(num, GFP_KERNEL | GFP_DMA);
+ rx_buf = kzalloc(num, GFP_KERNEL | GFP_DMA);
+ if (IS_ERR_OR_NULL(kstr) ||
+ IS_ERR_OR_NULL(tx_buf) ||
+ IS_ERR_OR_NULL(rx_buf)) {
+ dev_err(dev, "failed to alloc tx rx buffer\n");
+ goto test_end;
+ }
+
+ str_temp = kstr;
+ /* skip pass over "cs_gpio speed mode bits_per_word num" */
+ for (i = 0; i < 5; i++)
+ strsep(&str_temp, ", ");
+ for (i = 0; i < num; i++) {
+ token = strsep(&str_temp, ", ");
+ if (!token || kstrtoul(token, 16, &value))
+ break;
+ tx_buf[i] = (u8)(value & 0xff);
+ }
+ for (; i < num; i++) {
+ tx_buf[i] = spicc->test_data;
+ if (spicc_get_flag(spicc, FLAG_TEST_DATA_AUTO_INC))
+ spicc->test_data++;
+ }
+
+ spi_message_init(&m);
+ m.spi = spi_alloc_device(spicc->master);
+ if (cs_gpio < 1000)
+ m.spi->cs_gpio = cs_gpio;
+ else {
+ m.spi->cs_gpio = -ENOENT;
+ m.spi->chip_select = cs_gpio - 1000;
+ }
+ m.spi->max_speed_hz = speed;
+ m.spi->mode = mode;
+ m.spi->bits_per_word = bits_per_word;
+ spicc_setup(m.spi);
+ memset(&t, 0, sizeof(t));
+ t.tx_buf = (void *)tx_buf;
+ t.rx_buf = (void *)rx_buf;
+ t.len = num;
+ spi_message_add_tail(&t, &m);
+ spicc_handle_one_msg(spicc, &m);
+ spi_dev_put(m.spi);
+
+ dev_info(dev, "read back data ok\n");
+ for (i = 0; i < min_t(size_t, 32, num); i++)
+ dev_info(dev, "[%d]: 0x%2x, 0x%2x\n", i, tx_buf[i], rx_buf[i]);
+test_end:
+ kfree(kstr);
+ kfree(tx_buf);
+ kfree(rx_buf);
+ return count;
+}
+
+static struct class_attribute spicc_class_attrs[] = {
+ __ATTR(test, 0200, NULL, store_test),
+ __ATTR(test_data, 0644, show_setting, store_setting),
+ __ATTR(speed, 0644, show_setting, store_setting),
+ __ATTR(mode, 0644, show_setting, store_setting),
+ __ATTR(bit_width, 0644, show_setting, store_setting),
+ __ATTR(flags, 0644, show_setting, store_setting),
+ __ATTR(help, 0444, show_setting, NULL),
+#ifdef CONFIG_SPICC_LOG
+ __ATTR(log, 0444, show_setting, NULL),
+#endif
+ __ATTR_NULL
+};
+
+
+static int of_spicc_get_data(
+ struct spicc *spicc,
+ struct platform_device *pdev)
+{
+ struct device_node *np = pdev->dev.of_node;
+ struct resource *res;
+ int err;
+ unsigned int value;
+
+ err = of_property_read_u32(np, "device_id", &spicc->device_id);
+ if (err) {
+ dev_err(&pdev->dev, "get device_id fail\n");
+ return err;
+ }
+
+ err = of_property_read_u32(np, "dma_en", &value);
+ spicc_set_flag(spicc, FLAG_DMA_EN, err ? 0 : (!!value));
+ dev_info(&pdev->dev, "dma_en=%d\n", spicc_get_flag(spicc, FLAG_DMA_EN));
+ err = of_property_read_u32(np, "dma_tx_threshold", &value);
+ spicc->dma_tx_threshold = err ? 3 : value;
+ err = of_property_read_u32(np, "dma_rx_threshold", &value);
+ spicc->dma_rx_threshold = err ? 3 : value;
+ err = of_property_read_u32(np, "dma_num_per_read_burst", &value);
+ spicc->dma_num_per_read_burst = err ? 3 : value;
+ err = of_property_read_u32(np, "dma_num_per_write_burst", &value);
+ spicc->dma_num_per_write_burst = err ? 3 : value;
+ spicc->irq = irq_of_parse_and_map(np, 0);
+ dev_info(&pdev->dev, "irq = 0x%x\n", spicc->irq);
+ err = of_property_read_u32(np, "delay_control", &value);
+ spicc->delay_control = err ? 0x15 : value;
+ dev_info(&pdev->dev, "delay_control=%d\n", spicc->delay_control);
+ err = of_property_read_u32(np, "enhance", &value);
+ spicc_set_flag(spicc, FLAG_ENHANCE, err ? 0 : (!!value));
+ dev_info(&pdev->dev, "enhance=%d\n",
+ spicc_get_flag(spicc, FLAG_ENHANCE));
+ err = of_property_read_u32(np, "cs_delay", &value);
+ spicc->cs_delay = err ? 0 : value;
+ err = of_property_read_u32(np, "ssctl", &value);
+ spicc_set_flag(spicc, FLAG_SSCTL, err ? 0 : (!!value));
+#ifdef CONFIG_SPICC_LOG
+ err = of_property_read_u32(np, "log_size", &value);
+ spicc->log_size = err ? 0 : value;
+#endif
+
+ spicc->pinctrl = devm_pinctrl_get(&pdev->dev);
+ if (IS_ERR_OR_NULL(spicc->pinctrl)) {
+ dev_err(&pdev->dev, "get pinctrl fail\n");
+ return PTR_ERR(spicc->pinctrl);
+ }
+ spicc->pullup = pinctrl_lookup_state(spicc->pinctrl, "default");
+ if (!IS_ERR_OR_NULL(spicc->pullup))
+ pinctrl_select_state(spicc->pinctrl, spicc->pullup);
+ spicc->pullup = pinctrl_lookup_state(
+ spicc->pinctrl, "spicc_pullup");
+ spicc->pulldown = pinctrl_lookup_state(
+ spicc->pinctrl, "spicc_pulldown");
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ spicc->regs = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR_OR_NULL(spicc->regs)) {
+ dev_err(&pdev->dev, "get resource fail\n");
+ return PTR_ERR(spicc->regs);
+ }
+
+ spicc->clk = devm_clk_get(&pdev->dev, "spicc_clk");
+ if (IS_ERR_OR_NULL(spicc->clk)) {
+ dev_err(&pdev->dev, "get clk fail\n");
+ return PTR_ERR(spicc->clk);
+ }
+ return 0;
+}
+
+static int spicc_probe(struct platform_device *pdev)
+{
+ struct spi_master *master;
+ struct spicc *spicc;
+ int i, ret;
+
+ WARN_ON(!pdev->dev.of_node);
+ master = spi_alloc_master(&pdev->dev, sizeof(*spicc));
+ if (IS_ERR_OR_NULL(master)) {
+ dev_err(&pdev->dev, "allocate spi master failed!\n");
+ return -ENOMEM;
+ }
+ spicc = spi_master_get_devdata(master);
+ spicc->master = master;
+ dev_set_drvdata(&pdev->dev, spicc);
+ ret = of_spicc_get_data(spicc, pdev);
+ if (ret) {
+ dev_err(&pdev->dev, "of error=%d\n", ret);
+ goto err;
+ }
+ spicc_hw_init(spicc);
+ spicc_log_init(spicc);
+ spicc_log(spicc, 0, 0, PROBE_BEGIN);
+
+ master->dev.of_node = pdev->dev.of_node;
+ master->bus_num = spicc->device_id;
+ master->setup = spicc_setup;
+ master->transfer = spicc_transfer;
+ master->cleanup = spicc_cleanup;
+ master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH;
+ ret = spi_register_master(master);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "register spi master failed! (%d)\n", ret);
+ goto err;
+ }
+
+ INIT_WORK(&spicc->work, spicc_work);
+ spicc->wq = create_singlethread_workqueue(dev_name(master->dev.parent));
+ if (spicc->wq == NULL) {
+ ret = -EBUSY;
+ goto err;
+ }
+ spin_lock_init(&spicc->lock);
+ INIT_LIST_HEAD(&spicc->msg_queue);
+
+ init_completion(&spicc->completion);
+ if (spicc->irq) {
+ if (request_irq(spicc->irq, spicc_xfer_complete_isr,
+ IRQF_SHARED, "spicc", spicc)) {
+ dev_err(&pdev->dev, "master %d request irq(%d) failed!\n",
+ master->bus_num, spicc->irq);
+ spicc->irq = 0;
+ } else
+ disable_irq_nosync(spicc->irq);
+ }
+ spicc_log(spicc, &spicc->irq, 1, REQUEST_IRQ);
+
+ /*setup class*/
+ spicc->cls.name = kzalloc(10, GFP_KERNEL);
+ sprintf((char *)spicc->cls.name, "spicc%d", master->bus_num);
+ spicc->cls.class_attrs = spicc_class_attrs;
+ ret = class_register(&spicc->cls);
+ if (ret < 0)
+ dev_err(&pdev->dev, "register class failed! (%d)\n", ret);
+
+ dev_info(&pdev->dev, "cs_num=%d\n", master->num_chipselect);
+ if (master->cs_gpios) {
+ for (i = 0; i < master->num_chipselect; i++)
+ dev_info(&pdev->dev, "cs[%d]=%d\n", i,
+ master->cs_gpios[i]);
+ }
+ spicc_log(spicc, 0, 0, PROBE_END);
+ return ret;
+err:
+ spi_master_put(master);
+ return ret;
+}
+
+static int spicc_remove(struct platform_device *pdev)
+{
+ struct spicc *spicc;
+
+ spicc = (struct spicc *)dev_get_drvdata(&pdev->dev);
+ spicc_log_exit(spicc);
+ spi_unregister_master(spicc->master);
+ destroy_workqueue(spicc->wq);
+ if (spicc->pinctrl)
+ devm_pinctrl_put(spicc->pinctrl);
+ return 0;
+}
+
+#ifdef CONFIG_OF
+static const struct of_device_id spicc_of_match[] = {
+ { .compatible = "amlogic, spicc", },
+ {},
+};
+#else
+#define spicc_of_match NULL
+#endif
+
+static struct platform_driver spicc_driver = {
+ .probe = spicc_probe,
+ .remove = spicc_remove,
+ .driver = {
+ .name = "spicc",
+ .of_match_table = spicc_of_match,
+ .owner = THIS_MODULE,
+ },
+};
+
+static int __init spicc_init(void)
+{
+ return platform_driver_register(&spicc_driver);
+}
+
+static void __exit spicc_exit(void)
+{
+ platform_driver_unregister(&spicc_driver);
+}
+
+subsys_initcall(spicc_init);
+module_exit(spicc_exit);
+
+MODULE_DESCRIPTION("Amlogic SPICC driver");
+MODULE_LICENSE("GPL");
projects / platform / kernel / linux-amlogic.git / commitdiff