--- zzzz-none-000/linux-3.10.107/drivers/spi/spi-clps711x.c 2017-06-27 09:49:32.000000000 +0000 +++ scorpion-7490-727/linux-3.10.107/drivers/spi/spi-clps711x.c 2021-02-04 17:41:59.000000000 +0000 @@ -1,7 +1,7 @@ /* * CLPS711X SPI bus driver * - * Copyright (C) 2012 Alexander Shiyan + * Copyright (C) 2012-2014 Alexander Shiyan * * 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 @@ -11,164 +11,103 @@ #include #include -#include #include #include #include #include #include +#include +#include +#include #include #include -#include - #define DRIVER_NAME "spi-clps711x" -struct spi_clps711x_data { - struct completion done; +#define SYNCIO_FRMLEN(x) ((x) << 8) +#define SYNCIO_TXFRMEN (1 << 14) +struct spi_clps711x_data { + void __iomem *syncio; + struct regmap *syscon; struct clk *spi_clk; - u32 max_speed_hz; u8 *tx_buf; u8 *rx_buf; - int count; + unsigned int bpw; int len; - - int chipselect[0]; }; static int spi_clps711x_setup(struct spi_device *spi) { - struct spi_clps711x_data *hw = spi_master_get_devdata(spi->master); - - if (spi->bits_per_word != 8) { - dev_err(&spi->dev, "Unsupported master bus width %i\n", - spi->bits_per_word); - return -EINVAL; - } - /* We are expect that SPI-device is not selected */ - gpio_direction_output(hw->chipselect[spi->chip_select], - !(spi->mode & SPI_CS_HIGH)); + gpio_direction_output(spi->cs_gpio, !(spi->mode & SPI_CS_HIGH)); return 0; } -static void spi_clps711x_setup_mode(struct spi_device *spi) -{ - /* Setup edge for transfer */ - if (spi->mode & SPI_CPHA) - clps_writew(clps_readw(SYSCON3) | SYSCON3_ADCCKNSEN, SYSCON3); - else - clps_writew(clps_readw(SYSCON3) & ~SYSCON3_ADCCKNSEN, SYSCON3); -} - -static int spi_clps711x_setup_xfer(struct spi_device *spi, - struct spi_transfer *xfer) +static int spi_clps711x_prepare_message(struct spi_master *master, + struct spi_message *msg) { - u32 speed = xfer->speed_hz ? : spi->max_speed_hz; - u8 bpw = xfer->bits_per_word; - struct spi_clps711x_data *hw = spi_master_get_devdata(spi->master); - - if (bpw != 8) { - dev_err(&spi->dev, "Unsupported master bus width %i\n", bpw); - return -EINVAL; - } - - /* Setup SPI frequency divider */ - if (!speed || (speed >= hw->max_speed_hz)) - clps_writel((clps_readl(SYSCON1) & ~SYSCON1_ADCKSEL_MASK) | - SYSCON1_ADCKSEL(3), SYSCON1); - else if (speed >= (hw->max_speed_hz / 2)) - clps_writel((clps_readl(SYSCON1) & ~SYSCON1_ADCKSEL_MASK) | - SYSCON1_ADCKSEL(2), SYSCON1); - else if (speed >= (hw->max_speed_hz / 8)) - clps_writel((clps_readl(SYSCON1) & ~SYSCON1_ADCKSEL_MASK) | - SYSCON1_ADCKSEL(1), SYSCON1); - else - clps_writel((clps_readl(SYSCON1) & ~SYSCON1_ADCKSEL_MASK) | - SYSCON1_ADCKSEL(0), SYSCON1); + struct spi_clps711x_data *hw = spi_master_get_devdata(master); + struct spi_device *spi = msg->spi; - return 0; + /* Setup mode for transfer */ + return regmap_update_bits(hw->syscon, SYSCON_OFFSET, SYSCON3_ADCCKNSEN, + (spi->mode & SPI_CPHA) ? + SYSCON3_ADCCKNSEN : 0); } -static int spi_clps711x_transfer_one_message(struct spi_master *master, - struct spi_message *msg) +static int spi_clps711x_transfer_one(struct spi_master *master, + struct spi_device *spi, + struct spi_transfer *xfer) { struct spi_clps711x_data *hw = spi_master_get_devdata(master); - struct spi_transfer *xfer; - int status = 0, cs = hw->chipselect[msg->spi->chip_select]; - u32 data; - - spi_clps711x_setup_mode(msg->spi); - - list_for_each_entry(xfer, &msg->transfers, transfer_list) { - if (spi_clps711x_setup_xfer(msg->spi, xfer)) { - status = -EINVAL; - goto out_xfr; - } - - gpio_set_value(cs, !!(msg->spi->mode & SPI_CS_HIGH)); - - INIT_COMPLETION(hw->done); + u8 data; - hw->count = 0; - hw->len = xfer->len; - hw->tx_buf = (u8 *)xfer->tx_buf; - hw->rx_buf = (u8 *)xfer->rx_buf; + clk_set_rate(hw->spi_clk, xfer->speed_hz ? : spi->max_speed_hz); - /* Initiate transfer */ - data = hw->tx_buf ? hw->tx_buf[hw->count] : 0; - clps_writel(data | SYNCIO_FRMLEN(8) | SYNCIO_TXFRMEN, SYNCIO); + hw->len = xfer->len; + hw->bpw = xfer->bits_per_word; + hw->tx_buf = (u8 *)xfer->tx_buf; + hw->rx_buf = (u8 *)xfer->rx_buf; - wait_for_completion(&hw->done); + /* Initiate transfer */ + data = hw->tx_buf ? *hw->tx_buf++ : 0; + writel(data | SYNCIO_FRMLEN(hw->bpw) | SYNCIO_TXFRMEN, hw->syncio); - if (xfer->delay_usecs) - udelay(xfer->delay_usecs); - - if (xfer->cs_change || - list_is_last(&xfer->transfer_list, &msg->transfers)) - gpio_set_value(cs, !(msg->spi->mode & SPI_CS_HIGH)); - - msg->actual_length += xfer->len; - } - -out_xfr: - msg->status = status; - spi_finalize_current_message(master); - - return 0; + return 1; } static irqreturn_t spi_clps711x_isr(int irq, void *dev_id) { - struct spi_clps711x_data *hw = (struct spi_clps711x_data *)dev_id; - u32 data; + struct spi_master *master = dev_id; + struct spi_clps711x_data *hw = spi_master_get_devdata(master); + u8 data; /* Handle RX */ - data = clps_readb(SYNCIO); + data = readb(hw->syncio); if (hw->rx_buf) - hw->rx_buf[hw->count] = (u8)data; - - hw->count++; + *hw->rx_buf++ = data; /* Handle TX */ - if (hw->count < hw->len) { - data = hw->tx_buf ? hw->tx_buf[hw->count] : 0; - clps_writel(data | SYNCIO_FRMLEN(8) | SYNCIO_TXFRMEN, SYNCIO); + if (--hw->len > 0) { + data = hw->tx_buf ? *hw->tx_buf++ : 0; + writel(data | SYNCIO_FRMLEN(hw->bpw) | SYNCIO_TXFRMEN, + hw->syncio); } else - complete(&hw->done); + spi_finalize_current_transfer(master); return IRQ_HANDLED; } static int spi_clps711x_probe(struct platform_device *pdev) { - int i, ret; - struct spi_master *master; struct spi_clps711x_data *hw; struct spi_clps711x_pdata *pdata = dev_get_platdata(&pdev->dev); + struct spi_master *master; + struct resource *res; + int i, irq, ret; if (!pdata) { dev_err(&pdev->dev, "No platform data supplied\n"); @@ -180,117 +119,96 @@ return -EINVAL; } - master = spi_alloc_master(&pdev->dev, - sizeof(struct spi_clps711x_data) + - sizeof(int) * pdata->num_chipselect); - if (!master) { - dev_err(&pdev->dev, "SPI allocating memory error\n"); + irq = platform_get_irq(pdev, 0); + if (irq < 0) + return irq; + + master = spi_alloc_master(&pdev->dev, sizeof(*hw)); + if (!master) return -ENOMEM; + + master->cs_gpios = devm_kzalloc(&pdev->dev, sizeof(int) * + pdata->num_chipselect, GFP_KERNEL); + if (!master->cs_gpios) { + ret = -ENOMEM; + goto err_out; } master->bus_num = pdev->id; master->mode_bits = SPI_CPHA | SPI_CS_HIGH; + master->bits_per_word_mask = SPI_BPW_RANGE_MASK(1, 8); master->num_chipselect = pdata->num_chipselect; master->setup = spi_clps711x_setup; - master->transfer_one_message = spi_clps711x_transfer_one_message; + master->prepare_message = spi_clps711x_prepare_message; + master->transfer_one = spi_clps711x_transfer_one; hw = spi_master_get_devdata(master); for (i = 0; i < master->num_chipselect; i++) { - hw->chipselect[i] = pdata->chipselect[i]; - if (!gpio_is_valid(hw->chipselect[i])) { - dev_err(&pdev->dev, "Invalid CS GPIO %i\n", i); - ret = -EINVAL; - goto err_out; - } - if (gpio_request(hw->chipselect[i], DRIVER_NAME)) { + master->cs_gpios[i] = pdata->chipselect[i]; + ret = devm_gpio_request(&pdev->dev, master->cs_gpios[i], + DRIVER_NAME); + if (ret) { dev_err(&pdev->dev, "Can't get CS GPIO %i\n", i); - ret = -EINVAL; goto err_out; } } - hw->spi_clk = devm_clk_get(&pdev->dev, "spi"); + hw->spi_clk = devm_clk_get(&pdev->dev, NULL); if (IS_ERR(hw->spi_clk)) { - dev_err(&pdev->dev, "Can't get clocks\n"); ret = PTR_ERR(hw->spi_clk); goto err_out; } - hw->max_speed_hz = clk_get_rate(hw->spi_clk); - init_completion(&hw->done); - platform_set_drvdata(pdev, master); + hw->syscon = syscon_regmap_lookup_by_pdevname("syscon.3"); + if (IS_ERR(hw->syscon)) { + ret = PTR_ERR(hw->syscon); + goto err_out; + } + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + hw->syncio = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(hw->syncio)) { + ret = PTR_ERR(hw->syncio); + goto err_out; + } /* Disable extended mode due hardware problems */ - clps_writew(clps_readw(SYSCON3) & ~SYSCON3_ADCCON, SYSCON3); + regmap_update_bits(hw->syscon, SYSCON_OFFSET, SYSCON3_ADCCON, 0); /* Clear possible pending interrupt */ - clps_readl(SYNCIO); + readl(hw->syncio); - ret = devm_request_irq(&pdev->dev, IRQ_SSEOTI, spi_clps711x_isr, 0, - dev_name(&pdev->dev), hw); - if (ret) { - dev_err(&pdev->dev, "Can't request IRQ\n"); - clk_put(hw->spi_clk); - goto clk_out; - } + ret = devm_request_irq(&pdev->dev, irq, spi_clps711x_isr, 0, + dev_name(&pdev->dev), master); + if (ret) + goto err_out; - ret = spi_register_master(master); + ret = devm_spi_register_master(&pdev->dev, master); if (!ret) { dev_info(&pdev->dev, "SPI bus driver initialized. Master clock %u Hz\n", - hw->max_speed_hz); + master->max_speed_hz); return 0; } dev_err(&pdev->dev, "Failed to register master\n"); - devm_free_irq(&pdev->dev, IRQ_SSEOTI, hw); - -clk_out: - devm_clk_put(&pdev->dev, hw->spi_clk); err_out: - while (--i >= 0) - if (gpio_is_valid(hw->chipselect[i])) - gpio_free(hw->chipselect[i]); - - platform_set_drvdata(pdev, NULL); spi_master_put(master); - kfree(master); return ret; } -static int spi_clps711x_remove(struct platform_device *pdev) -{ - int i; - struct spi_master *master = platform_get_drvdata(pdev); - struct spi_clps711x_data *hw = spi_master_get_devdata(master); - - devm_free_irq(&pdev->dev, IRQ_SSEOTI, hw); - - for (i = 0; i < master->num_chipselect; i++) - if (gpio_is_valid(hw->chipselect[i])) - gpio_free(hw->chipselect[i]); - - devm_clk_put(&pdev->dev, hw->spi_clk); - platform_set_drvdata(pdev, NULL); - spi_unregister_master(master); - kfree(master); - - return 0; -} - static struct platform_driver clps711x_spi_driver = { .driver = { .name = DRIVER_NAME, - .owner = THIS_MODULE, }, .probe = spi_clps711x_probe, - .remove = spi_clps711x_remove, }; module_platform_driver(clps711x_spi_driver); MODULE_LICENSE("GPL"); MODULE_AUTHOR("Alexander Shiyan "); MODULE_DESCRIPTION("CLPS711X SPI bus driver"); +MODULE_ALIAS("platform:" DRIVER_NAME);