+++ /dev/null
---- a/include/linux/spi/spi.h
-+++ b/include/linux/spi/spi.h
-@@ -523,6 +523,8 @@ struct spi_transfer {
- u16 delay_usecs;
- u32 speed_hz;
-
-+ unsigned last_in_message_list;
-+
- struct list_head transfer_list;
- };
-
---- a/drivers/spi/Kconfig
-+++ b/drivers/spi/Kconfig
-@@ -198,6 +198,14 @@ config SPI_GPIO_OLD
-
- If unsure, say N.
-
-+config SPI_CNS21XX
-+ tristate "Cavium Netowrks CNS21xx SPI master (EXPERIMENTAL)"
-+ depends on ARCH_CNS21XX
-+ select SPI_BITBANG
-+ help
-+ This driver supports the buil-in SPI controller of the Cavium Networks
-+ CNS21xx SoCs.
-+
- config SPI_IMX
- tristate "Freescale i.MX SPI controllers"
- depends on ARCH_MXC
---- a/drivers/spi/Makefile
-+++ b/drivers/spi/Makefile
-@@ -21,6 +21,7 @@ obj-$(CONFIG_SPI_BFIN_SPORT) += spi-bfi
- obj-$(CONFIG_SPI_BITBANG) += spi-bitbang.o
- obj-$(CONFIG_SPI_BUTTERFLY) += spi-butterfly.o
- obj-$(CONFIG_SPI_CLPS711X) += spi-clps711x.o
-+obj-$(CONFIG_SPI_CNS21XX) += spi-cns21xx.o
- obj-$(CONFIG_SPI_COLDFIRE_QSPI) += spi-coldfire-qspi.o
- obj-$(CONFIG_SPI_DAVINCI) += spi-davinci.o
- obj-$(CONFIG_SPI_DESIGNWARE) += spi-dw.o
---- a/drivers/spi/spi-bitbang.c
-+++ b/drivers/spi/spi-bitbang.c
-@@ -328,6 +328,13 @@ static void bitbang_work(struct work_str
- */
- if (!m->is_dma_mapped)
- t->rx_dma = t->tx_dma = 0;
-+
-+ if (t->transfer_list.next == &m->transfers) {
-+ t->last_in_message_list = 1;
-+ } else {
-+ t->last_in_message_list = 0;
-+ }
-+
- status = bitbang->txrx_bufs(spi, t);
- }
- if (status > 0)
---- /dev/null
-+++ b/drivers/spi/spi-cns21xx.c
-@@ -0,0 +1,521 @@
-+/*
-+ * Copyright (c) 2008 Cavium Networks
-+ * Copyright (c) 2010-2012 Gabor Juhos <juhosg@openwrt.org>
-+ *
-+ * This file 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/init.h>
-+#include <linux/module.h>
-+#include <linux/spinlock.h>
-+#include <linux/workqueue.h>
-+#include <linux/interrupt.h>
-+#include <linux/delay.h>
-+#include <linux/errno.h>
-+#include <linux/platform_device.h>
-+#include <linux/io.h>
-+#include <linux/spi/spi.h>
-+#include <linux/spi/spi_bitbang.h>
-+
-+#include <mach/hardware.h>
-+#include <mach/cns21xx.h>
-+
-+#define DRIVER_NAME "cns21xx-spi"
-+
-+#ifdef CONFIG_CNS21XX_SPI_DEBUG
-+#define DBG(fmt, args...) pr_info("[CNS21XX_SPI_DEBUG]" fmt, ## args)
-+#else
-+#define DBG(fmt, args...) do {} while (0)
-+#endif /* CNS21XX_SPI_DEBUG */
-+
-+#define SPI_REG_CFG 0x40
-+#define SPI_REG_STAT 0x44
-+#define SPI_REG_BIT_RATE 0x48
-+#define SPI_REG_TX_CTRL 0x4c
-+#define SPI_REG_TX_DATA 0x50
-+#define SPI_REG_RX_CTRL 0x54
-+#define SPI_REG_RX_DATA 0x58
-+#define SPI_REG_FIFO_TX_CFG 0x5c
-+#define SPI_REG_FIFO_TX_CTRL 0x60
-+#define SPI_REG_FIFO_RX_CFG 0x64
-+#define SPI_REG_INTR_STAT 0x68
-+#define SPI_REG_INTR_ENA 0x6c
-+
-+#define CFG_SPI_EN BIT(31)
-+#define CFG_SPI_CLKPOL BIT(14)
-+#define CFG_SPI_CLKPHA BIT(13)
-+#define CFG_SPI_MASTER_EN BIT(11)
-+#define CFG_SPI_CHAR_LEN_M 0x3
-+#define CFG_SPI_CHAR_LEN_8BITS 0
-+#define CFG_SPI_CHAR_LEN_16BITS 1
-+#define CFG_SPI_CHAR_LEN_24BITS 2
-+#define CFG_SPI_CHAR_LEN_32BITS 3
-+
-+#define STAT_SPI_BUSY_STA BIT(1)
-+
-+#define BIT_RATE_DIV_1 0
-+#define BIT_RATE_DIV_2 1
-+#define BIT_RATE_DIV_4 2
-+#define BIT_RATE_DIV_8 3
-+#define BIT_RATE_DIV_16 4
-+#define BIT_RATE_DIV_32 5
-+#define BIT_RATE_DIV_64 6
-+#define BIT_RATE_DIV_128 7
-+
-+#define TX_CTRL_SPI_TXDAT_EOF BIT(2)
-+#define TX_CTRL_SPI_TXCH_NUM_M 0x3
-+#define TX_CTRL_CLEAR_MASK (TX_CTRL_SPI_TXDAT_EOF | \
-+ TX_CTRL_SPI_TXCH_NUM_M)
-+
-+#define RX_CTRL_SPI_RXDAT_EOF BIT(2)
-+#define RX_CTRL_SPI_RXCH_NUM_M 0x3
-+
-+#define INTR_STAT_SPI_TXBF_UNRN_FG BIT(7)
-+#define INTR_STAT_SPI_RXBF_OVRN_FG BIT(6)
-+#define INTR_STAT_SPI_TXFF_UNRN_FG BIT(5)
-+#define INTR_STAT_SPI_RXFF_OVRN_FG BIT(4)
-+#define INTR_STAT_SPI_TXBUF_FG BIT(3)
-+#define INTR_STAT_SPI_RXBUF_FG BIT(2)
-+#define INTR_STAT_SPI_TXFF_FG BIT(1)
-+#define INTR_STAT_SPI_RXFF_FG BIT(0)
-+
-+#define INTR_STAT_CLEAR_MASK (INTR_STAT_SPI_TXBF_UNRN_FG | \
-+ INTR_STAT_SPI_RXBF_OVRN_FG | \
-+ INTR_STAT_SPI_TXFF_UNRN_FG | \
-+ INTR_STAT_SPI_RXFF_OVRN_FG)
-+
-+#define FIFO_TX_CFG_SPI_TXFF_THRED_M 0x3
-+#define FIFO_TX_CFG_SPI_TXFF_THRED_S 4
-+#define FIFO_TX_CFG_SPI_TXFF_THRED_2 0
-+#define FIFO_TX_CFG_SPI_TXFF_THRED_4 1
-+#define FIFO_TX_CFG_SPI_TXFF_THRED_6 0
-+#define FIFO_TX_CFG_SPI_TXFF_STATUS_M 0xf
-+
-+#define FIFO_RX_CFG_SPI_RXFF_THRED_M 0x3
-+#define FIFO_RX_CFG_SPI_RXFF_THRED_S 4
-+#define FIFO_RX_CFG_SPI_RXFF_THRED_2 0
-+#define FIFO_RX_CFG_SPI_RXFF_THRED_4 1
-+#define FIFO_RX_CFG_SPI_RXFF_THRED_6 0
-+#define FIFO_RX_CFG_SPI_RXFF_STATUS_M 0xf
-+
-+#define CNS21XX_SPI_NUM_BIT_RATES 8
-+
-+struct cns21xx_spi {
-+ struct spi_bitbang bitbang;
-+
-+ struct spi_master *master;
-+ struct device *dev;
-+ void __iomem *base;
-+ struct resource *region;
-+
-+ unsigned freq_max;
-+ unsigned freq_min;
-+
-+};
-+
-+static inline struct cns21xx_spi *to_hw(struct spi_device *spi)
-+{
-+ return spi_master_get_devdata(spi->master);
-+}
-+
-+static inline u32 cns21xx_spi_rr(struct cns21xx_spi *hw, unsigned int reg)
-+{
-+ return __raw_readl(hw->base + reg);
-+}
-+
-+static inline void cns21xx_spi_wr(struct cns21xx_spi *hw, u32 val,
-+ unsigned int reg)
-+{
-+ __raw_writel(val, hw->base + reg);
-+}
-+
-+#define CNS21XX_SPI_RETRY_COUNT 100
-+static inline int cns21xx_spi_wait(struct cns21xx_spi *hw, unsigned int reg,
-+ u32 mask, u32 val)
-+{
-+ int retry_cnt = 0;
-+
-+ do {
-+ if ((cns21xx_spi_rr(hw, reg) & mask) == val)
-+ break;
-+
-+ if (++retry_cnt > CNS21XX_SPI_RETRY_COUNT) {
-+ dev_err(hw->dev, "timeout waiting on register %02x\n",
-+ reg);
-+ return -EIO;
-+ }
-+ } while (1);
-+
-+ return 0;
-+}
-+
-+static int cns21xx_spi_txrx_word(struct cns21xx_spi *hw, u8 tx_channel,
-+ u8 tx_eof_flag, u32 tx_data, u32 *rx_data)
-+{
-+ unsigned int tx_ctrl;
-+ u8 rx_channel;
-+ u8 rx_eof_flag;
-+ int err = 0;
-+
-+ err = cns21xx_spi_wait(hw, SPI_REG_STAT, STAT_SPI_BUSY_STA, 0);
-+ if (err)
-+ return err;
-+
-+ err = cns21xx_spi_wait(hw, SPI_REG_INTR_STAT, INTR_STAT_SPI_TXBUF_FG,
-+ INTR_STAT_SPI_TXBUF_FG);
-+ if (err)
-+ return err;
-+
-+ tx_ctrl = cns21xx_spi_rr(hw, SPI_REG_TX_CTRL);
-+ tx_ctrl &= ~(TX_CTRL_CLEAR_MASK);
-+ tx_ctrl |= (tx_channel & TX_CTRL_SPI_TXCH_NUM_M);
-+ tx_ctrl |= (tx_eof_flag) ? TX_CTRL_SPI_TXDAT_EOF : 0;
-+ cns21xx_spi_wr(hw, tx_ctrl, SPI_REG_TX_CTRL);
-+
-+ cns21xx_spi_wr(hw, tx_data, SPI_REG_TX_DATA);
-+
-+ err = cns21xx_spi_wait(hw, SPI_REG_INTR_STAT, INTR_STAT_SPI_RXBUF_FG,
-+ INTR_STAT_SPI_RXBUF_FG);
-+ if (err)
-+ return err;
-+
-+ rx_channel = cns21xx_spi_rr(hw, SPI_REG_RX_CTRL) &
-+ RX_CTRL_SPI_RXCH_NUM_M;
-+
-+ rx_eof_flag = (cns21xx_spi_rr(hw, SPI_REG_RX_CTRL) &
-+ RX_CTRL_SPI_RXDAT_EOF) ? 1 : 0;
-+
-+ *rx_data = cns21xx_spi_rr(hw, SPI_REG_RX_DATA);
-+
-+ if ((tx_channel != rx_channel) || (tx_eof_flag != rx_eof_flag))
-+ return -EPROTO;
-+
-+ return 0;
-+}
-+
-+static void cns21xx_spi_chipselect(struct spi_device *spi, int value)
-+{
-+ struct cns21xx_spi *hw = to_hw(spi);
-+ unsigned int spi_config;
-+ unsigned int tx_ctrl;
-+
-+ switch (value) {
-+ case BITBANG_CS_INACTIVE:
-+ break;
-+
-+ case BITBANG_CS_ACTIVE:
-+ spi_config = cns21xx_spi_rr(hw, SPI_REG_CFG);
-+
-+ if (spi->mode & SPI_CPHA)
-+ spi_config |= CFG_SPI_CLKPHA;
-+ else
-+ spi_config &= ~CFG_SPI_CLKPHA;
-+
-+ if (spi->mode & SPI_CPOL)
-+ spi_config |= CFG_SPI_CLKPOL;
-+ else
-+ spi_config &= ~CFG_SPI_CLKPOL;
-+
-+ cns21xx_spi_wr(hw, spi_config, SPI_REG_CFG);
-+
-+ tx_ctrl = cns21xx_spi_rr(hw, SPI_REG_TX_CTRL);
-+ tx_ctrl &= ~(TX_CTRL_CLEAR_MASK);
-+ tx_ctrl |= (spi->chip_select & TX_CTRL_SPI_TXCH_NUM_M);
-+ cns21xx_spi_wr(hw, tx_ctrl, SPI_REG_TX_CTRL);
-+
-+ break;
-+ }
-+}
-+
-+static int cns21xx_spi_setup(struct spi_device *spi)
-+{
-+ struct cns21xx_spi *hw = to_hw(spi);
-+
-+ if (spi->bits_per_word != 8) {
-+ dev_err(&spi->dev, "%s: invalid bits_per_word=%u\n",
-+ __func__, spi->bits_per_word);
-+ return -EINVAL;
-+ }
-+
-+ if (spi->max_speed_hz == 0)
-+ spi->max_speed_hz = hw->freq_max;
-+
-+ if (spi->max_speed_hz > hw->freq_max ||
-+ spi->max_speed_hz < hw->freq_min) {
-+ dev_err(&spi->dev, "%s: max_speed_hz=%u out of range\n",
-+ __func__, spi->max_speed_hz);
-+ return -EINVAL;
-+ }
-+
-+ return 0;
-+}
-+
-+static int cns21xx_spi_setup_transfer(struct spi_device *spi,
-+ struct spi_transfer *t)
-+{
-+ struct cns21xx_spi *hw = to_hw(spi);
-+ u8 bits_per_word;
-+ u32 hz;
-+ int i;
-+
-+ bits_per_word = (t) ? t->bits_per_word : spi->bits_per_word;
-+ hz = t ? t->speed_hz : spi->max_speed_hz;
-+
-+ if (!bits_per_word)
-+ bits_per_word = spi->bits_per_word;
-+
-+ if (!hz)
-+ hz = spi->max_speed_hz;
-+
-+ if (bits_per_word != 8) {
-+ dev_err(&spi->dev, "%s: invalid bits_per_word=%u\n",
-+ __func__, bits_per_word);
-+ return -EINVAL;
-+ }
-+
-+ if (hz > spi->max_speed_hz || hz > hw->freq_max || hz < hw->freq_min) {
-+ dev_err(&spi->dev, "%s: max_speed_hz=%u out of range\n",
-+ __func__, hz);
-+ return -EINVAL;
-+ }
-+
-+ for (i = 0; i < CNS21XX_SPI_NUM_BIT_RATES; i++)
-+ if (spi->max_speed_hz > (cns21xx_get_apb_freq() >> i))
-+ break;
-+
-+ DBG("max_speed:%uHz, curr_speed:%luHz, rate_index=%d\n",
-+ spi->max_speed_hz, cns21xx_get_apb_freq() / (1 << i), i);
-+
-+ cns21xx_spi_wr(hw, i, SPI_REG_BIT_RATE);
-+
-+ return 0;
-+}
-+
-+static int cns21xx_spi_txrx(struct spi_device *spi, struct spi_transfer *t)
-+{
-+ struct cns21xx_spi *hw = to_hw(spi);
-+ const unsigned char *tx_buf;
-+ unsigned char *rx_buf;
-+ u32 rx_data;
-+ int tx_eof;
-+ int err = 0;
-+ int i;
-+
-+ tx_buf = t->tx_buf;
-+ rx_buf = t->rx_buf;
-+ tx_eof = t->last_in_message_list;
-+
-+ DBG("txrx: tx %p, rx %p, len %d\n", tx_buf, rx_buf, t->len);
-+
-+ if (tx_buf) {
-+ for (i = 0; i < t->len; i++)
-+ DBG("tx_buf[%02d]: 0x%02x\n", i, tx_buf[i]);
-+
-+ for (i = 0; i < (t->len - 1); i++) {
-+ err = cns21xx_spi_txrx_word(hw, spi->chip_select, 0,
-+ tx_buf[i], &rx_data);
-+ if (err)
-+ goto done;
-+
-+ if (rx_buf) {
-+ rx_buf[i] = rx_data;
-+ DBG("rx_buf[%02d]:0x%02x\n", i, rx_buf[i]);
-+ }
-+ }
-+
-+ err = cns21xx_spi_txrx_word(hw, spi->chip_select, tx_eof,
-+ tx_buf[i], &rx_data);
-+ if (err)
-+ goto done;
-+
-+ if ((tx_eof) && rx_buf) {
-+ rx_buf[i] = rx_data;
-+ DBG("rx_buf[%02d]:0x%02x\n", i, rx_buf[i]);
-+ }
-+ } else if (rx_buf) {
-+ for (i = 0; i < (t->len - 1); i++) {
-+ err = cns21xx_spi_txrx_word(hw, spi->chip_select, 0,
-+ 0xff, &rx_data);
-+ if (err)
-+ goto done;
-+
-+ rx_buf[i] = rx_data;
-+ DBG("rx_buf[%02d]:0x%02x\n", i, rx_buf[i]);
-+ }
-+
-+ err = cns21xx_spi_txrx_word(hw, spi->chip_select, tx_eof,
-+ 0xff, &rx_data);
-+ if (err)
-+ goto done;
-+
-+ rx_buf[i] = rx_data;
-+ DBG("rx_buf[%02d]:0x%02x\n", i, rx_buf[i]);
-+ }
-+
-+ done:
-+ return (err) ? err : t->len;
-+}
-+
-+static void __init cns21xx_spi_hw_init(struct cns21xx_spi *hw)
-+{
-+ u32 t;
-+ u32 pclk;
-+
-+ /* Setup configuration register */
-+ cns21xx_spi_wr(hw, CFG_SPI_MASTER_EN, SPI_REG_CFG);
-+
-+ /* Set default clock to PCLK/2 */
-+ cns21xx_spi_wr(hw, BIT_RATE_DIV_2, SPI_REG_BIT_RATE);
-+
-+ /* Configure SPI's Tx channel */
-+ cns21xx_spi_wr(hw, 0, SPI_REG_TX_CTRL);
-+
-+ /* Configure Tx FIFO Threshold */
-+ t = cns21xx_spi_rr(hw, SPI_REG_FIFO_TX_CFG);
-+ t &= ~(FIFO_TX_CFG_SPI_TXFF_THRED_M << FIFO_TX_CFG_SPI_TXFF_THRED_S);
-+ t |= (FIFO_TX_CFG_SPI_TXFF_THRED_2 << FIFO_TX_CFG_SPI_TXFF_THRED_S);
-+ cns21xx_spi_wr(hw, t, SPI_REG_FIFO_TX_CFG);
-+
-+ /* Configure Rx FIFO Threshold */
-+ t = cns21xx_spi_rr(hw, SPI_REG_FIFO_RX_CFG);
-+ t &= ~(FIFO_RX_CFG_SPI_RXFF_THRED_M << FIFO_RX_CFG_SPI_RXFF_THRED_S);
-+ t |= (FIFO_RX_CFG_SPI_RXFF_THRED_2 << FIFO_RX_CFG_SPI_RXFF_THRED_S);
-+ cns21xx_spi_wr(hw, t, SPI_REG_FIFO_RX_CFG);
-+
-+ /* Disable interrupts, and clear interrupt status */
-+ cns21xx_spi_wr(hw, 0, SPI_REG_INTR_ENA);
-+ cns21xx_spi_wr(hw, INTR_STAT_CLEAR_MASK, SPI_REG_INTR_STAT);
-+
-+ (void) cns21xx_spi_rr(hw, SPI_REG_RX_DATA);
-+
-+ /* Enable SPI */
-+ t = cns21xx_spi_rr(hw, SPI_REG_CFG);
-+ t |= CFG_SPI_EN;
-+ cns21xx_spi_wr(hw, t, SPI_REG_CFG);
-+
-+ pclk = cns21xx_get_apb_freq();
-+ hw->freq_max = pclk;
-+ hw->freq_min = pclk / (1 << BIT_RATE_DIV_128);
-+}
-+
-+static int __init cns21xx_spi_probe(struct platform_device *pdev)
-+{
-+ struct cns21xx_spi *hw;
-+ struct spi_master *master;
-+ struct resource *res;
-+ int err = 0;
-+
-+ master = spi_alloc_master(&pdev->dev, sizeof(struct cns21xx_spi));
-+ if (!master) {
-+ dev_err(&pdev->dev, "No memory for spi_master\n");
-+ return -ENOMEM;
-+ }
-+
-+ hw = spi_master_get_devdata(master);
-+
-+ platform_set_drvdata(pdev, hw);
-+ hw->master = spi_master_get(master);
-+ hw->dev = &pdev->dev;
-+
-+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-+ if (!res) {
-+ dev_dbg(&pdev->dev, "no MEM resource found\n");
-+ err = -ENOENT;
-+ goto err_put_master;
-+ }
-+
-+ hw->region = request_mem_region(res->start, resource_size(res),
-+ dev_name(&pdev->dev));
-+ if (!hw->region) {
-+ dev_err(&pdev->dev, "unable to reserve iomem region\n");
-+ err = -ENXIO;
-+ goto err_put_master;
-+ }
-+
-+ hw->base = ioremap(res->start, resource_size(res));
-+ if (!hw->base) {
-+ dev_err(&pdev->dev, "ioremap failed\n");
-+ err = -ENOENT;
-+ goto err_release_region;
-+ }
-+
-+ cns21xx_spi_hw_init(hw);
-+
-+ master->bus_num = pdev->id;
-+ if (master->bus_num == -1)
-+ master->bus_num = 0;
-+
-+ master->num_chipselect = 4;
-+ master->setup = cns21xx_spi_setup;
-+
-+ hw->bitbang.master = hw->master;
-+ hw->bitbang.chipselect = cns21xx_spi_chipselect;
-+ hw->bitbang.txrx_bufs = cns21xx_spi_txrx;
-+ hw->bitbang.setup_transfer = cns21xx_spi_setup_transfer;
-+
-+ err = spi_bitbang_start(&hw->bitbang);
-+ if (err) {
-+ dev_err(hw->dev, "unable to register SPI master\n");
-+ goto err_unmap;
-+ }
-+
-+ dev_info(hw->dev, "iomem at %08x\n", res->start);
-+
-+ return 0;
-+
-+ err_unmap:
-+ iounmap(hw->base);
-+
-+ err_release_region:
-+ release_resource(hw->region);
-+ kfree(hw->region);
-+
-+ err_put_master:
-+ spi_master_put(hw->bitbang.master);
-+ platform_set_drvdata(pdev, NULL);
-+
-+ return err;
-+}
-+
-+static int cns21xx_spi_remove(struct platform_device *pdev)
-+{
-+ struct cns21xx_spi *hw = platform_get_drvdata(pdev);
-+
-+ spi_bitbang_stop(&hw->bitbang);
-+ iounmap(hw->base);
-+ release_resource(hw->region);
-+ kfree(hw->region);
-+ spi_master_put(hw->bitbang.master);
-+ platform_set_drvdata(pdev, NULL);
-+
-+ return 0;
-+}
-+
-+static struct platform_driver cns21xx_spi_driver = {
-+ .remove = cns21xx_spi_remove,
-+ .driver = {
-+ .name = DRIVER_NAME,
-+ .owner = THIS_MODULE,
-+ },
-+};
-+
-+static int __init cns21xx_spi_init(void)
-+{
-+ return platform_driver_probe(&cns21xx_spi_driver, cns21xx_spi_probe);
-+}
-+
-+static void __exit cns21xx_spi_exit(void)
-+{
-+ platform_driver_unregister(&cns21xx_spi_driver);
-+}
-+
-+module_init(cns21xx_spi_init);
-+module_exit(cns21xx_spi_exit);
-+
-+MODULE_DESCRIPTION("Cavium Networks CNS21xx SPI Controller driver");
-+MODULE_AUTHOR("STAR Semi Corp.");
-+MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>");
-+MODULE_LICENSE("GPL v2");
-+MODULE_ALIAS("platform:" DRIVER_NAME);
projects / openwrt.git / blobdiff