579 lines
15 KiB
Diff
579 lines
15 KiB
Diff
--- 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);
|