diff options
Diffstat (limited to 'target/linux/cns21xx/patches-2.6.36/105-cns21xx-spi-driver.patch')
| -rw-r--r-- | target/linux/cns21xx/patches-2.6.36/105-cns21xx-spi-driver.patch | 577 |
1 files changed, 0 insertions, 577 deletions
diff --git a/target/linux/cns21xx/patches-2.6.36/105-cns21xx-spi-driver.patch b/target/linux/cns21xx/patches-2.6.36/105-cns21xx-spi-driver.patch deleted file mode 100644 index b30474c6b4..0000000000 --- a/target/linux/cns21xx/patches-2.6.36/105-cns21xx-spi-driver.patch +++ /dev/null @@ -1,577 +0,0 @@ ---- a/include/linux/spi/spi.h -+++ b/include/linux/spi/spi.h -@@ -442,6 +442,8 @@ 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 -@@ -152,6 +152,14 @@ config SPI_GPIO_OLD - - If unsure, say N. - -+config SPI_CNS21XX -+ tristate "Cavium Netowrks CNS21xx SPI master" -+ depends on ARCH_CNS21XX && EXPERIMENTAL -+ 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 -@@ -48,6 +48,7 @@ obj-$(CONFIG_SPI_SH_SCI) += spi_sh_sci. - obj-$(CONFIG_SPI_SH_MSIOF) += spi_sh_msiof.o - obj-$(CONFIG_SPI_STMP3XXX) += spi_stmp.o - obj-$(CONFIG_SPI_NUC900) += spi_nuc900.o -+obj-$(CONFIG_SPI_CNS21XX) += spi_cns21xx.o - - # special build for s3c24xx spi driver with fiq support - spi_s3c24xx_hw-y := spi_s3c24xx.o ---- a/drivers/spi/spi_bitbang.c -+++ b/drivers/spi/spi_bitbang.c -@@ -337,6 +337,13 @@ 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 +1,520 @@ -+/* -+ * Copyright (c) 2008 Cavium Networks -+ * Copyright (c) 2010 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/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 __devexit 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 = __devexit_p(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); |