diff options
Diffstat (limited to 'ANDROID_3.4.5/drivers/spi/spi-sh-hspi.c')
| -rw-r--r-- | ANDROID_3.4.5/drivers/spi/spi-sh-hspi.c | 331 |
1 files changed, 0 insertions, 331 deletions
diff --git a/ANDROID_3.4.5/drivers/spi/spi-sh-hspi.c b/ANDROID_3.4.5/drivers/spi/spi-sh-hspi.c deleted file mode 100644 index 934138c7..00000000 --- a/ANDROID_3.4.5/drivers/spi/spi-sh-hspi.c +++ /dev/null @@ -1,331 +0,0 @@ -/* - * SuperH HSPI bus driver - * - * Copyright (C) 2011 Kuninori Morimoto - * - * Based on spi-sh.c: - * Based on pxa2xx_spi.c: - * Copyright (C) 2011 Renesas Solutions Corp. - * Copyright (C) 2005 Stephen Street / StreetFire Sound Labs - * - * 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; version 2 of the License. - * - * 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. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA - * - */ - -#include <linux/clk.h> -#include <linux/module.h> -#include <linux/kernel.h> -#include <linux/timer.h> -#include <linux/delay.h> -#include <linux/list.h> -#include <linux/interrupt.h> -#include <linux/platform_device.h> -#include <linux/pm_runtime.h> -#include <linux/io.h> -#include <linux/spi/spi.h> -#include <linux/spi/sh_hspi.h> - -#define SPCR 0x00 -#define SPSR 0x04 -#define SPSCR 0x08 -#define SPTBR 0x0C -#define SPRBR 0x10 -#define SPCR2 0x14 - -/* SPSR */ -#define RXFL (1 << 2) - -#define hspi2info(h) (h->dev->platform_data) - -struct hspi_priv { - void __iomem *addr; - struct spi_master *master; - struct device *dev; - struct clk *clk; -}; - -/* - * basic function - */ -static void hspi_write(struct hspi_priv *hspi, int reg, u32 val) -{ - iowrite32(val, hspi->addr + reg); -} - -static u32 hspi_read(struct hspi_priv *hspi, int reg) -{ - return ioread32(hspi->addr + reg); -} - -/* - * transfer function - */ -static int hspi_status_check_timeout(struct hspi_priv *hspi, u32 mask, u32 val) -{ - int t = 256; - - while (t--) { - if ((mask & hspi_read(hspi, SPSR)) == val) - return 0; - - msleep(20); - } - - dev_err(hspi->dev, "timeout\n"); - return -ETIMEDOUT; -} - -/* - * spi master function - */ -static int hspi_prepare_transfer(struct spi_master *master) -{ - struct hspi_priv *hspi = spi_master_get_devdata(master); - - pm_runtime_get_sync(hspi->dev); - return 0; -} - -static int hspi_unprepare_transfer(struct spi_master *master) -{ - struct hspi_priv *hspi = spi_master_get_devdata(master); - - pm_runtime_put_sync(hspi->dev); - return 0; -} - -static void hspi_hw_setup(struct hspi_priv *hspi, - struct spi_message *msg, - struct spi_transfer *t) -{ - struct spi_device *spi = msg->spi; - struct device *dev = hspi->dev; - u32 target_rate; - u32 spcr, idiv_clk; - u32 rate, best_rate, min, tmp; - - target_rate = t ? t->speed_hz : 0; - if (!target_rate) - target_rate = spi->max_speed_hz; - - /* - * find best IDIV/CLKCx settings - */ - min = ~0; - best_rate = 0; - spcr = 0; - for (idiv_clk = 0x00; idiv_clk <= 0x3F; idiv_clk++) { - rate = clk_get_rate(hspi->clk); - - /* IDIV calculation */ - if (idiv_clk & (1 << 5)) - rate /= 128; - else - rate /= 16; - - /* CLKCx calculation */ - rate /= (((idiv_clk & 0x1F) + 1) * 2) ; - - /* save best settings */ - tmp = abs(target_rate - rate); - if (tmp < min) { - min = tmp; - spcr = idiv_clk; - best_rate = rate; - } - } - - if (spi->mode & SPI_CPHA) - spcr |= 1 << 7; - if (spi->mode & SPI_CPOL) - spcr |= 1 << 6; - - dev_dbg(dev, "speed %d/%d\n", target_rate, best_rate); - - hspi_write(hspi, SPCR, spcr); - hspi_write(hspi, SPSR, 0x0); - hspi_write(hspi, SPSCR, 0x1); /* master mode */ -} - -static int hspi_transfer_one_message(struct spi_master *master, - struct spi_message *msg) -{ - struct hspi_priv *hspi = spi_master_get_devdata(master); - struct spi_transfer *t; - u32 tx; - u32 rx; - int ret, i; - - dev_dbg(hspi->dev, "%s\n", __func__); - - ret = 0; - list_for_each_entry(t, &msg->transfers, transfer_list) { - hspi_hw_setup(hspi, msg, t); - - for (i = 0; i < t->len; i++) { - - /* wait remains */ - ret = hspi_status_check_timeout(hspi, 0x1, 0); - if (ret < 0) - break; - - tx = 0; - if (t->tx_buf) - tx = (u32)((u8 *)t->tx_buf)[i]; - - hspi_write(hspi, SPTBR, tx); - - /* wait recive */ - ret = hspi_status_check_timeout(hspi, 0x4, 0x4); - if (ret < 0) - break; - - rx = hspi_read(hspi, SPRBR); - if (t->rx_buf) - ((u8 *)t->rx_buf)[i] = (u8)rx; - - } - - msg->actual_length += t->len; - } - - msg->status = ret; - spi_finalize_current_message(master); - - return ret; -} - -static int hspi_setup(struct spi_device *spi) -{ - struct hspi_priv *hspi = spi_master_get_devdata(spi->master); - struct device *dev = hspi->dev; - - if (8 != spi->bits_per_word) { - dev_err(dev, "bits_per_word should be 8\n"); - return -EIO; - } - - dev_dbg(dev, "%s setup\n", spi->modalias); - - return 0; -} - -static void hspi_cleanup(struct spi_device *spi) -{ - struct hspi_priv *hspi = spi_master_get_devdata(spi->master); - struct device *dev = hspi->dev; - - dev_dbg(dev, "%s cleanup\n", spi->modalias); -} - -static int __devinit hspi_probe(struct platform_device *pdev) -{ - struct resource *res; - struct spi_master *master; - struct hspi_priv *hspi; - struct clk *clk; - int ret; - - /* get base addr */ - res = platform_get_resource(pdev, IORESOURCE_MEM, 0); - if (!res) { - dev_err(&pdev->dev, "invalid resource\n"); - return -EINVAL; - } - - master = spi_alloc_master(&pdev->dev, sizeof(*hspi)); - if (!master) { - dev_err(&pdev->dev, "spi_alloc_master error.\n"); - return -ENOMEM; - } - - clk = clk_get(NULL, "shyway_clk"); - if (!clk) { - dev_err(&pdev->dev, "shyway_clk is required\n"); - ret = -EINVAL; - goto error0; - } - - hspi = spi_master_get_devdata(master); - dev_set_drvdata(&pdev->dev, hspi); - - /* init hspi */ - hspi->master = master; - hspi->dev = &pdev->dev; - hspi->clk = clk; - hspi->addr = devm_ioremap(hspi->dev, - res->start, resource_size(res)); - if (!hspi->addr) { - dev_err(&pdev->dev, "ioremap error.\n"); - ret = -ENOMEM; - goto error1; - } - - master->num_chipselect = 1; - master->bus_num = pdev->id; - master->setup = hspi_setup; - master->cleanup = hspi_cleanup; - master->mode_bits = SPI_CPOL | SPI_CPHA; - master->prepare_transfer_hardware = hspi_prepare_transfer; - master->transfer_one_message = hspi_transfer_one_message; - master->unprepare_transfer_hardware = hspi_unprepare_transfer; - ret = spi_register_master(master); - if (ret < 0) { - dev_err(&pdev->dev, "spi_register_master error.\n"); - goto error2; - } - - pm_runtime_enable(&pdev->dev); - - dev_info(&pdev->dev, "probed\n"); - - return 0; - - error2: - devm_iounmap(hspi->dev, hspi->addr); - error1: - clk_put(clk); - error0: - spi_master_put(master); - - return ret; -} - -static int __devexit hspi_remove(struct platform_device *pdev) -{ - struct hspi_priv *hspi = dev_get_drvdata(&pdev->dev); - - pm_runtime_disable(&pdev->dev); - - clk_put(hspi->clk); - spi_unregister_master(hspi->master); - devm_iounmap(hspi->dev, hspi->addr); - - return 0; -} - -static struct platform_driver hspi_driver = { - .probe = hspi_probe, - .remove = __devexit_p(hspi_remove), - .driver = { - .name = "sh-hspi", - .owner = THIS_MODULE, - }, -}; -module_platform_driver(hspi_driver); - -MODULE_DESCRIPTION("SuperH HSPI bus driver"); -MODULE_LICENSE("GPL"); -MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>"); -MODULE_ALIAS("platform:sh_spi"); |