diff options
Diffstat (limited to 'target/linux/cns3xxx/files/drivers/spi/spi-cns3xxx.c')
| -rw-r--r-- | target/linux/cns3xxx/files/drivers/spi/spi-cns3xxx.c | 448 |
1 files changed, 0 insertions, 448 deletions
diff --git a/target/linux/cns3xxx/files/drivers/spi/spi-cns3xxx.c b/target/linux/cns3xxx/files/drivers/spi/spi-cns3xxx.c deleted file mode 100644 index 6301986..0000000 --- a/target/linux/cns3xxx/files/drivers/spi/spi-cns3xxx.c +++ /dev/null @@ -1,448 +0,0 @@ -/******************************************************************************* - * - * CNS3XXX SPI controller driver (master mode only) - * - * Copyright (c) 2008 Cavium Networks - * Copyright 2011 Gateworks Corporation - * Chris Lang <clang@gateworks.com> - * - * 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. - * - * This file is distributed in the hope that it will be useful, - * but AS-IS and WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, TITLE, or - * NONINFRINGEMENT. See the GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this file; if not, write to the Free Software - * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA or - * visit http://www.gnu.org/licenses/. - * - * This file may also be available under a different license from Cavium. - * Contact Cavium Networks for more information - * - ******************************************************************************/ - -#include <linux/init.h> -#include <linux/spinlock.h> -#include <linux/workqueue.h> -#include <linux/interrupt.h> -#include <linux/delay.h> -#include <linux/errno.h> -#include <linux/err.h> -#include <linux/clk.h> -#include <linux/platform_device.h> - -#include <linux/spi/spi.h> -#include <linux/spi/spi_bitbang.h> -#include <linux/mtd/partitions.h> -#include <linux/dma-mapping.h> -#include <linux/slab.h> - -#include <asm/io.h> -#include <asm/memory.h> -#include <asm/dma.h> -#include <asm/delay.h> -#include <linux/module.h> - -/* - * define access macros - */ -#define SPI_MEM_MAP_VALUE(reg_offset) (*((u32 volatile *)(hw->base + reg_offset))) - -#define SPI_CONFIGURATION_REG SPI_MEM_MAP_VALUE(0x00) -#define SPI_SERVICE_STATUS_REG SPI_MEM_MAP_VALUE(0x04) -#define SPI_BIT_RATE_CONTROL_REG SPI_MEM_MAP_VALUE(0x08) -#define SPI_TRANSMIT_CONTROL_REG SPI_MEM_MAP_VALUE(0x0C) -#define SPI_TRANSMIT_BUFFER_REG SPI_MEM_MAP_VALUE(0x10) -#define SPI_RECEIVE_CONTROL_REG SPI_MEM_MAP_VALUE(0x14) -#define SPI_RECEIVE_BUFFER_REG SPI_MEM_MAP_VALUE(0x18) -#define SPI_FIFO_TRANSMIT_CONFIG_REG SPI_MEM_MAP_VALUE(0x1C) -#define SPI_FIFO_TRANSMIT_CONTROL_REG SPI_MEM_MAP_VALUE(0x20) -#define SPI_FIFO_RECEIVE_CONFIG_REG SPI_MEM_MAP_VALUE(0x24) -#define SPI_INTERRUPT_STATUS_REG SPI_MEM_MAP_VALUE(0x28) -#define SPI_INTERRUPT_ENABLE_REG SPI_MEM_MAP_VALUE(0x2C) - -#define SPI_TRANSMIT_BUFFER_REG_ADDR (CNS3XXX_SSP_BASE +0x10) -#define SPI_RECEIVE_BUFFER_REG_ADDR (CNS3XXX_SSP_BASE +0x18) - -/* Structure for SPI controller of CNS3XXX SOCs */ -struct cns3xxx_spi { - /* bitbang has to be first */ - struct spi_bitbang bitbang; - struct completion done; - wait_queue_head_t wait; - - int len; - int count; - int last_in_message_list; - - /* data buffers */ - const unsigned char *tx; - unsigned char *rx; - - void __iomem *base; - struct spi_master *master; - struct platform_device *pdev; - struct device *dev; -}; - -static inline u8 cns3xxx_spi_bus_idle(struct cns3xxx_spi *hw) -{ - return ((SPI_SERVICE_STATUS_REG & 0x1) ? 0 : 1); -} - -static inline u8 cns3xxx_spi_tx_buffer_empty(struct cns3xxx_spi *hw) -{ - return ((SPI_INTERRUPT_STATUS_REG & (0x1 << 3)) ? 1 : 0); -} - -static inline u8 cns3xxx_spi_rx_buffer_full(struct cns3xxx_spi *hw) -{ - return ((SPI_INTERRUPT_STATUS_REG & (0x1 << 2)) ? 1 : 0); -} - -u8 cns3xxx_spi_tx_rx(struct cns3xxx_spi *hw, u8 tx_channel, u8 tx_eof, - u32 tx_data, u32 * rx_data) -{ - u8 rx_channel; - u8 rx_eof; - - while (!cns3xxx_spi_bus_idle(hw)) ; // do nothing - - while (!cns3xxx_spi_tx_buffer_empty(hw)) ; // do nothing - - SPI_TRANSMIT_CONTROL_REG &= ~(0x7); - SPI_TRANSMIT_CONTROL_REG |= (tx_channel & 0x3) | ((tx_eof & 0x1) << 2); - - SPI_TRANSMIT_BUFFER_REG = tx_data; - - while (!cns3xxx_spi_rx_buffer_full(hw)) ; // do nothing - - rx_channel = SPI_RECEIVE_CONTROL_REG & 0x3; - rx_eof = (SPI_RECEIVE_CONTROL_REG & (0x1 << 2)) ? 1 : 0; - - *rx_data = SPI_RECEIVE_BUFFER_REG; - - if ((tx_channel != rx_channel) || (tx_eof != rx_eof)) { - return 0; - } else { - return 1; - } -} - -u8 cns3xxx_spi_tx(struct cns3xxx_spi *hw, u8 tx_channel, u8 tx_eof, u32 tx_data) -{ - - while (!cns3xxx_spi_bus_idle(hw)) ; // do nothing - - while (!cns3xxx_spi_tx_buffer_empty(hw)) ; // do nothing - - SPI_TRANSMIT_CONTROL_REG &= ~(0x7); - SPI_TRANSMIT_CONTROL_REG |= (tx_channel & 0x3) | ((tx_eof & 0x1) << 2); - - SPI_TRANSMIT_BUFFER_REG = tx_data; - - return 1; -} - -static inline struct cns3xxx_spi *to_hw(struct spi_device *sdev) -{ - return spi_master_get_devdata(sdev->master); -} - -static int cns3xxx_spi_setup_transfer(struct spi_device *spi, - struct spi_transfer *t) -{ - return 0; -} - -static void cns3xxx_spi_chipselect(struct spi_device *spi, int value) -{ - struct cns3xxx_spi *hw = to_hw(spi); - unsigned int spi_config; - - switch (value) { - case BITBANG_CS_INACTIVE: - break; - - case BITBANG_CS_ACTIVE: - spi_config = SPI_CONFIGURATION_REG; - - if (spi->mode & SPI_CPHA) - spi_config |= (0x1 << 13); - else - spi_config &= ~(0x1 << 13); - - if (spi->mode & SPI_CPOL) - spi_config |= (0x1 << 14); - else - spi_config &= ~(0x1 << 14); - - /* write new configration */ - SPI_CONFIGURATION_REG = spi_config; - - SPI_TRANSMIT_CONTROL_REG &= ~(0x7); - SPI_TRANSMIT_CONTROL_REG |= (spi->chip_select & 0x3); - - break; - } -} - -static int cns3xxx_spi_setup(struct spi_device *spi) -{ - if (!spi->bits_per_word) - spi->bits_per_word = 8; - - return 0; -} - -static int cns3xxx_spi_txrx(struct spi_device *spi, struct spi_transfer *t) -{ - struct cns3xxx_spi *hw = to_hw(spi); - - dev_dbg(&spi->dev, "txrx: tx %p, rx %p, len %d\n", t->tx_buf, t->rx_buf, - t->len); - - hw->tx = t->tx_buf; - hw->rx = t->rx_buf; - hw->len = t->len; - hw->count = 0; - hw->last_in_message_list = t->last_in_message_list; - - init_completion(&hw->done); - - if (hw->tx) { - int i; - u32 rx_data; - for (i = 0; i < (hw->len - 1); i++) { - dev_dbg(&spi->dev, - "[SPI_CNS3XXX_DEBUG] hw->tx[%02d]: 0x%02x\n", i, - hw->tx[i]); - cns3xxx_spi_tx_rx(hw, spi->chip_select, 0, hw->tx[i], - &rx_data); - if (hw->rx) { - hw->rx[i] = rx_data; - dev_dbg(&spi->dev, - "[SPI_CNS3XXX_DEBUG] hw->rx[%02d]: 0x%02x\n", - i, hw->rx[i]); - } - } - - if (t->last_in_message_list) { - cns3xxx_spi_tx_rx(hw, spi->chip_select, 1, hw->tx[i], - &rx_data); - if (hw->rx) { - hw->rx[i] = rx_data; - dev_dbg(&spi->dev, - "[SPI_CNS3XXX_DEBUG] hw->rx[%02d]: 0x%02x\n", - i, hw->rx[i]); - } - } else { - cns3xxx_spi_tx_rx(hw, spi->chip_select, 0, hw->tx[i], - &rx_data); - } - goto done; - } - - if (hw->rx) { - int i; - u32 rx_data; - for (i = 0; i < (hw->len - 1); i++) { - cns3xxx_spi_tx_rx(hw, spi->chip_select, 0, 0xff, &rx_data); - hw->rx[i] = rx_data; - dev_dbg(&spi->dev, - "[SPI_CNS3XXX_DEBUG] hw->rx[%02d]: 0x%02x\n", i, - hw->rx[i]); - } - - if (t->last_in_message_list) { - cns3xxx_spi_tx_rx(hw, spi->chip_select, 1, 0xff, &rx_data); - } else { - cns3xxx_spi_tx_rx(hw, spi->chip_select, 0, 0xff, &rx_data); - } - hw->rx[i] = rx_data; - dev_dbg(&spi->dev, "[SPI_CNS3XXX_DEBUG] hw->rx[%02d]: 0x%02x\n", - i, hw->rx[i]); - } -done: - return hw->len; -} - -static void __init cns3xxx_spi_initial(struct cns3xxx_spi *hw) -{ - SPI_CONFIGURATION_REG = (((0x0 & 0x3) << 0) | /* 8bits shift length */ - (0x0 << 9) | /* SPI mode */ - (0x0 << 10) | /* disable FIFO */ - (0x1 << 11) | /* SPI master mode */ - (0x0 << 12) | /* disable SPI loopback mode */ - (0x1 << 13) | /* clock phase */ - (0x1 << 14) | /* clock polarity */ - (0x0 << 24) | /* disable - SPI data swap */ - (0x1 << 29) | /* enable - 2IO Read mode */ - (0x0 << 30) | /* disable - SPI high speed read for system boot up */ - (0x0 << 31)); /* disable - SPI */ - - /* Set SPI bit rate PCLK/2 */ - SPI_BIT_RATE_CONTROL_REG = 0x1; - - /* Set SPI Tx channel 0 */ - SPI_TRANSMIT_CONTROL_REG = 0x0; - - /* Set Tx FIFO Threshold, Tx FIFO has 2 words */ - SPI_FIFO_TRANSMIT_CONFIG_REG &= ~(0x03 << 4); - SPI_FIFO_TRANSMIT_CONFIG_REG |= ((0x0 & 0x03) << 4); - - /* Set Rx FIFO Threshold, Rx FIFO has 2 words */ - SPI_FIFO_RECEIVE_CONFIG_REG &= ~(0x03 << 4); - SPI_FIFO_RECEIVE_CONFIG_REG |= ((0x0 & 0x03) << 4); - - /* Disable all interrupt */ - SPI_INTERRUPT_ENABLE_REG = 0x0; - - /* Clear spurious interrupt sources */ - SPI_INTERRUPT_STATUS_REG = (0x0F << 4); - - /* Enable SPI */ - SPI_CONFIGURATION_REG |= (0x1 << 31); - - return; -} - -static int cns3xxx_spi_probe(struct platform_device *pdev) -{ - struct spi_master *master; - struct cns3xxx_spi *hw; - struct resource *res; - int err = 0; - - printk("%s: setup CNS3XXX SPI Controller\n", __FUNCTION__); - - res = platform_get_resource(pdev, IORESOURCE_MEM, 0); - if (!res) - return -ENODEV; - - /* Allocate master with space for cns3xxx_spi */ - master = spi_alloc_master(&pdev->dev, sizeof(struct cns3xxx_spi)); - if (master == NULL) { - dev_err(&pdev->dev, "No memory for spi_master\n"); - err = -ENOMEM; - goto err_nomem; - } - - hw = spi_master_get_devdata(master); - memset(hw, 0, sizeof(struct cns3xxx_spi)); - - hw->master = spi_master_get(master); - hw->dev = &pdev->dev; - - hw->base = devm_ioremap_resource(hw->dev, res); - if (IS_ERR(hw->base)) { - dev_err(hw->dev, "Unable to map registers\n"); - err = PTR_ERR(hw->base); - goto err_register; - } - - platform_set_drvdata(pdev, hw); - init_completion(&hw->done); - - /* setup the master state. */ - - master->num_chipselect = 4; - master->bus_num = 1; - - /* setup the state for the bitbang driver */ - - hw->bitbang.master = hw->master; - hw->bitbang.setup_transfer = cns3xxx_spi_setup_transfer; - hw->bitbang.chipselect = cns3xxx_spi_chipselect; - hw->bitbang.txrx_bufs = cns3xxx_spi_txrx; - hw->bitbang.master->setup = cns3xxx_spi_setup; - - dev_dbg(hw->dev, "bitbang at %p\n", &hw->bitbang); - - /* SPI controller initializations */ - cns3xxx_spi_initial(hw); - - /* register SPI controller */ - - err = spi_bitbang_start(&hw->bitbang); - if (err) { - dev_err(&pdev->dev, "Failed to register SPI master\n"); - goto err_register; - } - - return 0; - -err_register: - spi_master_put(hw->master);; - -err_nomem: - return err; -} - -static int cns3xxx_spi_remove(struct platform_device *dev) -{ - struct cns3xxx_spi *hw = platform_get_drvdata(dev); - - platform_set_drvdata(dev, NULL); - - spi_unregister_master(hw->master); - - spi_master_put(hw->master); - return 0; -} - -#ifdef CONFIG_PM - -static int cns3xxx_spi_suspend(struct platform_device *pdev, pm_message_t msg) -{ - struct cns3xxx_spi *hw = platform_get_drvdata(pdev); - - return 0; -} - -static int cns3xxx_spi_resume(struct platform_device *pdev) -{ - struct cns3xxx_spi *hw = platform_get_drvdata(pdev); - - return 0; -} - -#else -#define cns3xxx_spi_suspend NULL -#define cns3xxx_spi_resume NULL -#endif - -static struct platform_driver cns3xxx_spi_driver = { - .probe = cns3xxx_spi_probe, - .remove = cns3xxx_spi_remove, - .suspend = cns3xxx_spi_suspend, - .resume = cns3xxx_spi_resume, - .driver = { - .name = "cns3xxx_spi", - .owner = THIS_MODULE, - }, -}; - -static int __init cns3xxx_spi_init(void) -{ - return platform_driver_register(&cns3xxx_spi_driver); -} - -static void __exit cns3xxx_spi_exit(void) -{ - platform_driver_unregister(&cns3xxx_spi_driver); -} - -module_init(cns3xxx_spi_init); -module_exit(cns3xxx_spi_exit); - -MODULE_AUTHOR("Cavium Networks"); -MODULE_DESCRIPTION("CNS3XXX SPI Controller Driver"); -MODULE_LICENSE("GPL"); -MODULE_ALIAS("platform:cns3xxx_spi"); - -EXPORT_SYMBOL_GPL(cns3xxx_spi_tx_rx); |