687 lines
18 KiB
C
687 lines
18 KiB
C
/*
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* Kontron PLD MFD core driver
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*
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* Copyright (c) 2010-2013 Kontron Europe GmbH
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* Author: Michael Brunner <michael.brunner@kontron.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License 2 as published
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* by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/platform_device.h>
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#include <linux/mfd/core.h>
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#include <linux/mfd/kempld.h>
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#include <linux/module.h>
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#include <linux/dmi.h>
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#include <linux/io.h>
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#include <linux/delay.h>
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#define MAX_ID_LEN 4
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static char force_device_id[MAX_ID_LEN + 1] = "";
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module_param_string(force_device_id, force_device_id, sizeof(force_device_id), 0);
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MODULE_PARM_DESC(force_device_id, "Override detected product");
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/*
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* Get hardware mutex to block firmware from accessing the pld.
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* It is possible for the firmware may hold the mutex for an extended length of
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* time. This function will block until access has been granted.
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*/
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static void kempld_get_hardware_mutex(struct kempld_device_data *pld)
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{
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/* The mutex bit will read 1 until access has been granted */
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while (ioread8(pld->io_index) & KEMPLD_MUTEX_KEY)
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msleep(1);
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}
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static void kempld_release_hardware_mutex(struct kempld_device_data *pld)
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{
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/* The harware mutex is released when 1 is written to the mutex bit. */
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iowrite8(KEMPLD_MUTEX_KEY, pld->io_index);
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}
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static int kempld_get_info_generic(struct kempld_device_data *pld)
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{
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u16 version;
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u8 spec;
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kempld_get_mutex(pld);
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version = kempld_read16(pld, KEMPLD_VERSION);
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spec = kempld_read8(pld, KEMPLD_SPEC);
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pld->info.buildnr = kempld_read16(pld, KEMPLD_BUILDNR);
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pld->info.minor = KEMPLD_VERSION_GET_MINOR(version);
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pld->info.major = KEMPLD_VERSION_GET_MAJOR(version);
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pld->info.number = KEMPLD_VERSION_GET_NUMBER(version);
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pld->info.type = KEMPLD_VERSION_GET_TYPE(version);
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if (spec == 0xff) {
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pld->info.spec_minor = 0;
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pld->info.spec_major = 1;
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} else {
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pld->info.spec_minor = KEMPLD_SPEC_GET_MINOR(spec);
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pld->info.spec_major = KEMPLD_SPEC_GET_MAJOR(spec);
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}
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if (pld->info.spec_major > 0)
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pld->feature_mask = kempld_read16(pld, KEMPLD_FEATURE);
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else
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pld->feature_mask = 0;
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kempld_release_mutex(pld);
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return 0;
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}
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enum kempld_cells {
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KEMPLD_I2C = 0,
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KEMPLD_WDT,
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KEMPLD_GPIO,
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KEMPLD_UART,
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};
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static struct mfd_cell kempld_devs[] = {
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[KEMPLD_I2C] = {
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.name = "kempld-i2c",
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},
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[KEMPLD_WDT] = {
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.name = "kempld-wdt",
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},
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[KEMPLD_GPIO] = {
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.name = "kempld-gpio",
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},
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[KEMPLD_UART] = {
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.name = "kempld-uart",
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},
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};
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#define KEMPLD_MAX_DEVS ARRAY_SIZE(kempld_devs)
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static int kempld_register_cells_generic(struct kempld_device_data *pld)
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{
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struct mfd_cell devs[KEMPLD_MAX_DEVS];
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int i = 0;
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if (pld->feature_mask & KEMPLD_FEATURE_BIT_I2C)
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devs[i++] = kempld_devs[KEMPLD_I2C];
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if (pld->feature_mask & KEMPLD_FEATURE_BIT_WATCHDOG)
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devs[i++] = kempld_devs[KEMPLD_WDT];
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if (pld->feature_mask & KEMPLD_FEATURE_BIT_GPIO)
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devs[i++] = kempld_devs[KEMPLD_GPIO];
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if (pld->feature_mask & KEMPLD_FEATURE_MASK_UART)
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devs[i++] = kempld_devs[KEMPLD_UART];
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return mfd_add_devices(pld->dev, -1, devs, i, NULL, 0, NULL);
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}
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static struct resource kempld_ioresource = {
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.start = KEMPLD_IOINDEX,
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.end = KEMPLD_IODATA,
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.flags = IORESOURCE_IO,
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};
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static const struct kempld_platform_data kempld_platform_data_generic = {
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.pld_clock = KEMPLD_CLK,
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.ioresource = &kempld_ioresource,
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.get_hardware_mutex = kempld_get_hardware_mutex,
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.release_hardware_mutex = kempld_release_hardware_mutex,
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.get_info = kempld_get_info_generic,
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.register_cells = kempld_register_cells_generic,
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};
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static struct platform_device *kempld_pdev;
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static int kempld_create_platform_device(const struct dmi_system_id *id)
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{
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struct kempld_platform_data *pdata = id->driver_data;
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int ret;
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kempld_pdev = platform_device_alloc("kempld", -1);
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if (!kempld_pdev)
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return -ENOMEM;
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ret = platform_device_add_data(kempld_pdev, pdata, sizeof(*pdata));
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if (ret)
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goto err;
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ret = platform_device_add_resources(kempld_pdev, pdata->ioresource, 1);
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if (ret)
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goto err;
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ret = platform_device_add(kempld_pdev);
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if (ret)
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goto err;
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return 0;
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err:
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platform_device_put(kempld_pdev);
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return ret;
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}
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/**
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* kempld_read8 - read 8 bit register
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* @pld: kempld_device_data structure describing the PLD
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* @index: register index on the chip
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*
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* kempld_get_mutex must be called prior to calling this function.
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*/
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u8 kempld_read8(struct kempld_device_data *pld, u8 index)
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{
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iowrite8(index, pld->io_index);
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return ioread8(pld->io_data);
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}
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EXPORT_SYMBOL_GPL(kempld_read8);
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/**
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* kempld_write8 - write 8 bit register
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* @pld: kempld_device_data structure describing the PLD
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* @index: register index on the chip
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* @data: new register value
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*
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* kempld_get_mutex must be called prior to calling this function.
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*/
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void kempld_write8(struct kempld_device_data *pld, u8 index, u8 data)
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{
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iowrite8(index, pld->io_index);
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iowrite8(data, pld->io_data);
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}
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EXPORT_SYMBOL_GPL(kempld_write8);
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/**
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* kempld_read16 - read 16 bit register
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* @pld: kempld_device_data structure describing the PLD
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* @index: register index on the chip
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*
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* kempld_get_mutex must be called prior to calling this function.
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*/
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u16 kempld_read16(struct kempld_device_data *pld, u8 index)
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{
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return kempld_read8(pld, index) | kempld_read8(pld, index + 1) << 8;
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}
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EXPORT_SYMBOL_GPL(kempld_read16);
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/**
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* kempld_write16 - write 16 bit register
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* @pld: kempld_device_data structure describing the PLD
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* @index: register index on the chip
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* @data: new register value
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*
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* kempld_get_mutex must be called prior to calling this function.
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*/
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void kempld_write16(struct kempld_device_data *pld, u8 index, u16 data)
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{
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kempld_write8(pld, index, (u8)data);
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kempld_write8(pld, index + 1, (u8)(data >> 8));
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}
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EXPORT_SYMBOL_GPL(kempld_write16);
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/**
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* kempld_read32 - read 32 bit register
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* @pld: kempld_device_data structure describing the PLD
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* @index: register index on the chip
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*
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* kempld_get_mutex must be called prior to calling this function.
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*/
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u32 kempld_read32(struct kempld_device_data *pld, u8 index)
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{
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return kempld_read16(pld, index) | kempld_read16(pld, index + 2) << 16;
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}
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EXPORT_SYMBOL_GPL(kempld_read32);
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/**
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* kempld_write32 - write 32 bit register
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* @pld: kempld_device_data structure describing the PLD
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* @index: register index on the chip
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* @data: new register value
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*
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* kempld_get_mutex must be called prior to calling this function.
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*/
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void kempld_write32(struct kempld_device_data *pld, u8 index, u32 data)
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{
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kempld_write16(pld, index, (u16)data);
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kempld_write16(pld, index + 2, (u16)(data >> 16));
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}
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EXPORT_SYMBOL_GPL(kempld_write32);
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/**
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* kempld_get_mutex - acquire PLD mutex
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* @pld: kempld_device_data structure describing the PLD
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*/
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void kempld_get_mutex(struct kempld_device_data *pld)
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{
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struct kempld_platform_data *pdata = dev_get_platdata(pld->dev);
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mutex_lock(&pld->lock);
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pdata->get_hardware_mutex(pld);
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}
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EXPORT_SYMBOL_GPL(kempld_get_mutex);
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/**
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* kempld_release_mutex - release PLD mutex
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* @pld: kempld_device_data structure describing the PLD
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*/
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void kempld_release_mutex(struct kempld_device_data *pld)
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{
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struct kempld_platform_data *pdata = dev_get_platdata(pld->dev);
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pdata->release_hardware_mutex(pld);
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mutex_unlock(&pld->lock);
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}
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EXPORT_SYMBOL_GPL(kempld_release_mutex);
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/**
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* kempld_get_info - update device specific information
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* @pld: kempld_device_data structure describing the PLD
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*
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* This function calls the configured board specific kempld_get_info_XXXX
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* function which is responsible for gathering information about the specific
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* hardware. The information is then stored within the pld structure.
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*/
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static int kempld_get_info(struct kempld_device_data *pld)
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{
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struct kempld_platform_data *pdata = dev_get_platdata(pld->dev);
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return pdata->get_info(pld);
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}
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/*
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* kempld_register_cells - register cell drivers
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*
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* This function registers cell drivers for the detected hardware by calling
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* the configured kempld_register_cells_XXXX function which is responsible
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* to detect and register the needed cell drivers.
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*/
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static int kempld_register_cells(struct kempld_device_data *pld)
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{
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struct kempld_platform_data *pdata = dev_get_platdata(pld->dev);
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return pdata->register_cells(pld);
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}
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static int kempld_detect_device(struct kempld_device_data *pld)
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{
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char *version_type;
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u8 index_reg;
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int ret;
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mutex_lock(&pld->lock);
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/* Check for empty IO space */
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index_reg = ioread8(pld->io_index);
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if (index_reg == 0xff && ioread8(pld->io_data) == 0xff) {
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mutex_unlock(&pld->lock);
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return -ENODEV;
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}
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/* Release hardware mutex if acquired */
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if (!(index_reg & KEMPLD_MUTEX_KEY)) {
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iowrite8(KEMPLD_MUTEX_KEY, pld->io_index);
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/* PXT and COMe-cPC2 boards may require a second release */
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iowrite8(KEMPLD_MUTEX_KEY, pld->io_index);
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}
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mutex_unlock(&pld->lock);
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ret = kempld_get_info(pld);
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if (ret)
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return ret;
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switch (pld->info.type) {
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case 0:
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version_type = "release";
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break;
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case 1:
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version_type = "debug";
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break;
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case 2:
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version_type = "custom";
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break;
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default:
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version_type = "unspecified";
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}
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dev_info(pld->dev, "Found Kontron PLD %d\n", pld->info.number);
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dev_info(pld->dev, "%s version %d.%d build %d, specification %d.%d\n",
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version_type, pld->info.major, pld->info.minor,
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pld->info.buildnr, pld->info.spec_major,
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pld->info.spec_minor);
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return kempld_register_cells(pld);
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}
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static int kempld_probe(struct platform_device *pdev)
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{
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struct kempld_platform_data *pdata = dev_get_platdata(&pdev->dev);
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struct device *dev = &pdev->dev;
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struct kempld_device_data *pld;
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struct resource *ioport;
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int ret;
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pld = devm_kzalloc(dev, sizeof(*pld), GFP_KERNEL);
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if (!pld)
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return -ENOMEM;
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ioport = platform_get_resource(pdev, IORESOURCE_IO, 0);
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if (!ioport)
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return -EINVAL;
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pld->io_base = devm_ioport_map(dev, ioport->start,
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ioport->end - ioport->start);
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if (!pld->io_base)
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return -ENOMEM;
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pld->io_index = pld->io_base;
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pld->io_data = pld->io_base + 1;
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pld->pld_clock = pdata->pld_clock;
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pld->dev = dev;
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mutex_init(&pld->lock);
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platform_set_drvdata(pdev, pld);
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ret = kempld_detect_device(pld);
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if (ret)
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return ret;
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return 0;
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}
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static int kempld_remove(struct platform_device *pdev)
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{
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struct kempld_device_data *pld = platform_get_drvdata(pdev);
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struct kempld_platform_data *pdata = dev_get_platdata(pld->dev);
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mfd_remove_devices(&pdev->dev);
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pdata->release_hardware_mutex(pld);
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return 0;
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}
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static struct platform_driver kempld_driver = {
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.driver = {
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.name = "kempld",
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.owner = THIS_MODULE,
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},
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.probe = kempld_probe,
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.remove = kempld_remove,
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};
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static struct dmi_system_id __initdata kempld_dmi_table[] = {
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{
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.ident = "BHL6",
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.matches = {
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DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
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DMI_MATCH(DMI_BOARD_NAME, "COMe-bHL6"),
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},
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.driver_data = (void *)&kempld_platform_data_generic,
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.callback = kempld_create_platform_device,
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},
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{
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.ident = "CCR2",
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.matches = {
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DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
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DMI_MATCH(DMI_BOARD_NAME, "COMe-bIP2"),
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},
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.driver_data = (void *)&kempld_platform_data_generic,
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.callback = kempld_create_platform_device,
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}, {
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.ident = "CCR6",
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.matches = {
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DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
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DMI_MATCH(DMI_BOARD_NAME, "COMe-bIP6"),
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},
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.driver_data = (void *)&kempld_platform_data_generic,
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.callback = kempld_create_platform_device,
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}, {
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.ident = "CHL6",
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.matches = {
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DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
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DMI_MATCH(DMI_BOARD_NAME, "COMe-cHL6"),
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},
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.driver_data = (void *)&kempld_platform_data_generic,
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.callback = kempld_create_platform_device,
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}, {
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.ident = "CHR2",
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.matches = {
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DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
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DMI_MATCH(DMI_BOARD_NAME, "ETXexpress-SC T2"),
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},
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.driver_data = (void *)&kempld_platform_data_generic,
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.callback = kempld_create_platform_device,
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}, {
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.ident = "CHR2",
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.matches = {
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DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
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DMI_MATCH(DMI_BOARD_NAME, "ETXe-SC T2"),
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},
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.driver_data = (void *)&kempld_platform_data_generic,
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.callback = kempld_create_platform_device,
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}, {
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.ident = "CHR2",
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.matches = {
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DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
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DMI_MATCH(DMI_BOARD_NAME, "COMe-bSC2"),
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},
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.driver_data = (void *)&kempld_platform_data_generic,
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.callback = kempld_create_platform_device,
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}, {
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.ident = "CHR6",
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.matches = {
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DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
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DMI_MATCH(DMI_BOARD_NAME, "ETXexpress-SC T6"),
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},
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.driver_data = (void *)&kempld_platform_data_generic,
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.callback = kempld_create_platform_device,
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}, {
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.ident = "CHR6",
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.matches = {
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DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
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DMI_MATCH(DMI_BOARD_NAME, "ETXe-SC T6"),
|
|
},
|
|
.driver_data = (void *)&kempld_platform_data_generic,
|
|
.callback = kempld_create_platform_device,
|
|
}, {
|
|
.ident = "CHR6",
|
|
.matches = {
|
|
DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
|
|
DMI_MATCH(DMI_BOARD_NAME, "COMe-bSC6"),
|
|
},
|
|
.driver_data = (void *)&kempld_platform_data_generic,
|
|
.callback = kempld_create_platform_device,
|
|
}, {
|
|
.ident = "CNTG",
|
|
.matches = {
|
|
DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
|
|
DMI_MATCH(DMI_BOARD_NAME, "ETXexpress-PC"),
|
|
},
|
|
.driver_data = (void *)&kempld_platform_data_generic,
|
|
.callback = kempld_create_platform_device,
|
|
}, {
|
|
.ident = "CNTG",
|
|
.matches = {
|
|
DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
|
|
DMI_MATCH(DMI_BOARD_NAME, "COMe-bPC2"),
|
|
},
|
|
.driver_data = (void *)&kempld_platform_data_generic,
|
|
.callback = kempld_create_platform_device,
|
|
}, {
|
|
.ident = "CNTX",
|
|
.matches = {
|
|
DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
|
|
DMI_MATCH(DMI_BOARD_NAME, "PXT"),
|
|
},
|
|
.driver_data = (void *)&kempld_platform_data_generic,
|
|
.callback = kempld_create_platform_device,
|
|
}, {
|
|
.ident = "CVV6",
|
|
.matches = {
|
|
DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
|
|
DMI_MATCH(DMI_BOARD_NAME, "COMe-cBT"),
|
|
},
|
|
.driver_data = (void *)&kempld_platform_data_generic,
|
|
.callback = kempld_create_platform_device,
|
|
}, {
|
|
.ident = "FRI2",
|
|
.matches = {
|
|
DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
|
|
DMI_MATCH(DMI_BIOS_VERSION, "FRI2"),
|
|
},
|
|
.driver_data = (void *)&kempld_platform_data_generic,
|
|
.callback = kempld_create_platform_device,
|
|
}, {
|
|
.ident = "FRI2",
|
|
.matches = {
|
|
DMI_MATCH(DMI_PRODUCT_NAME, "Fish River Island II"),
|
|
},
|
|
.driver_data = (void *)&kempld_platform_data_generic,
|
|
.callback = kempld_create_platform_device,
|
|
}, {
|
|
.ident = "MBR1",
|
|
.matches = {
|
|
DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
|
|
DMI_MATCH(DMI_BOARD_NAME, "ETX-OH"),
|
|
},
|
|
.driver_data = (void *)&kempld_platform_data_generic,
|
|
.callback = kempld_create_platform_device,
|
|
}, {
|
|
.ident = "MVV1",
|
|
.matches = {
|
|
DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
|
|
DMI_MATCH(DMI_BOARD_NAME, "COMe-mBT"),
|
|
},
|
|
.driver_data = (void *)&kempld_platform_data_generic,
|
|
.callback = kempld_create_platform_device,
|
|
}, {
|
|
.ident = "NTC1",
|
|
.matches = {
|
|
DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
|
|
DMI_MATCH(DMI_BOARD_NAME, "nanoETXexpress-TT"),
|
|
},
|
|
.driver_data = (void *)&kempld_platform_data_generic,
|
|
.callback = kempld_create_platform_device,
|
|
}, {
|
|
.ident = "NTC1",
|
|
.matches = {
|
|
DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
|
|
DMI_MATCH(DMI_BOARD_NAME, "nETXe-TT"),
|
|
},
|
|
.driver_data = (void *)&kempld_platform_data_generic,
|
|
.callback = kempld_create_platform_device,
|
|
}, {
|
|
.ident = "NTC1",
|
|
.matches = {
|
|
DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
|
|
DMI_MATCH(DMI_BOARD_NAME, "COMe-mTT"),
|
|
},
|
|
.driver_data = (void *)&kempld_platform_data_generic,
|
|
.callback = kempld_create_platform_device,
|
|
}, {
|
|
.ident = "NUP1",
|
|
.matches = {
|
|
DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
|
|
DMI_MATCH(DMI_BOARD_NAME, "COMe-mCT"),
|
|
},
|
|
.driver_data = (void *)&kempld_platform_data_generic,
|
|
.callback = kempld_create_platform_device,
|
|
}, {
|
|
.ident = "UNP1",
|
|
.matches = {
|
|
DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
|
|
DMI_MATCH(DMI_BOARD_NAME, "microETXexpress-DC"),
|
|
},
|
|
.driver_data = (void *)&kempld_platform_data_generic,
|
|
.callback = kempld_create_platform_device,
|
|
}, {
|
|
.ident = "UNP1",
|
|
.matches = {
|
|
DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
|
|
DMI_MATCH(DMI_BOARD_NAME, "COMe-cDC2"),
|
|
},
|
|
.driver_data = (void *)&kempld_platform_data_generic,
|
|
.callback = kempld_create_platform_device,
|
|
}, {
|
|
.ident = "UNTG",
|
|
.matches = {
|
|
DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
|
|
DMI_MATCH(DMI_BOARD_NAME, "microETXexpress-PC"),
|
|
},
|
|
.driver_data = (void *)&kempld_platform_data_generic,
|
|
.callback = kempld_create_platform_device,
|
|
}, {
|
|
.ident = "UNTG",
|
|
.matches = {
|
|
DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
|
|
DMI_MATCH(DMI_BOARD_NAME, "COMe-cPC2"),
|
|
},
|
|
.driver_data = (void *)&kempld_platform_data_generic,
|
|
.callback = kempld_create_platform_device,
|
|
}, {
|
|
.ident = "UUP6",
|
|
.matches = {
|
|
DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
|
|
DMI_MATCH(DMI_BOARD_NAME, "COMe-cCT6"),
|
|
},
|
|
.driver_data = (void *)&kempld_platform_data_generic,
|
|
.callback = kempld_create_platform_device,
|
|
},
|
|
{
|
|
.ident = "UTH6",
|
|
.matches = {
|
|
DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
|
|
DMI_MATCH(DMI_BOARD_NAME, "COMe-cTH6"),
|
|
},
|
|
.driver_data = (void *)&kempld_platform_data_generic,
|
|
.callback = kempld_create_platform_device,
|
|
},
|
|
{}
|
|
};
|
|
MODULE_DEVICE_TABLE(dmi, kempld_dmi_table);
|
|
|
|
static int __init kempld_init(void)
|
|
{
|
|
const struct dmi_system_id *id;
|
|
int ret;
|
|
|
|
if (force_device_id[0]) {
|
|
for (id = kempld_dmi_table; id->matches[0].slot != DMI_NONE; id++)
|
|
if (strstr(id->ident, force_device_id))
|
|
if (id->callback && id->callback(id))
|
|
break;
|
|
if (id->matches[0].slot == DMI_NONE)
|
|
return -ENODEV;
|
|
} else {
|
|
if (!dmi_check_system(kempld_dmi_table))
|
|
return -ENODEV;
|
|
}
|
|
|
|
ret = platform_driver_register(&kempld_driver);
|
|
if (ret)
|
|
return ret;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void __exit kempld_exit(void)
|
|
{
|
|
if (kempld_pdev)
|
|
platform_device_unregister(kempld_pdev);
|
|
|
|
platform_driver_unregister(&kempld_driver);
|
|
}
|
|
|
|
module_init(kempld_init);
|
|
module_exit(kempld_exit);
|
|
|
|
MODULE_DESCRIPTION("KEM PLD Core Driver");
|
|
MODULE_AUTHOR("Michael Brunner <michael.brunner@kontron.com>");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS("platform:kempld-core");
|