![Linus Walleij](/assets/img/avatar_default.png)
This adds core support for the ST-Ericsson U300 series platforms: U300, U330, U335 and U365. Supports memory mappings, interrupt controller, system timer (clocksource and clockevents), and binds to the existing drivers for the PrimeCells used in this design: PL190 (VIC), PL180 (MMC/SD host) and PL011 (UART). This is intented to serve as starting point for our mainling work, more patches to follow. Signed-off-by: Linus Walleij <linus.walleij@stericsson.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
217 lines
4.6 KiB
C
217 lines
4.6 KiB
C
/*
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*
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* arch/arm/mach-u300/mmc.c
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*
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*
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* Copyright (C) 2009 ST-Ericsson AB
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* License terms: GNU General Public License (GPL) version 2
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*
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* Author: Linus Walleij <linus.walleij@stericsson.com>
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* Author: Johan Lundin <johan.lundin@stericsson.com>
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* Author: Jonas Aaberg <jonas.aberg@stericsson.com>
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*/
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#include <linux/device.h>
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#include <linux/amba/bus.h>
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#include <linux/mmc/host.h>
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#include <linux/input.h>
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#include <linux/workqueue.h>
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#include <linux/delay.h>
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#include <linux/regulator/consumer.h>
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#include <linux/regulator/machine.h>
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#include <linux/gpio.h>
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#include <asm/mach/mmc.h>
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#include "mmc.h"
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struct mmci_card_event {
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struct input_dev *mmc_input;
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int mmc_inserted;
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struct work_struct workq;
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struct mmc_platform_data mmc0_plat_data;
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};
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static unsigned int mmc_status(struct device *dev)
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{
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struct mmci_card_event *mmci_card = container_of(
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dev->platform_data,
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struct mmci_card_event, mmc0_plat_data);
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return mmci_card->mmc_inserted;
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}
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/*
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* Here follows a large chunk of code which will only be enabled if you
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* have both the AB3100 chip mounted and the MMC subsystem activated.
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*/
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static u32 mmc_translate_vdd(struct device *dev, unsigned int voltage)
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{
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int v;
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/*
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* MMC Spec:
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* bit 7: 1.70 - 1.95V
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* bit 8 - 14: 2.0 - 2.6V
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* bit 15 - 23: 2.7 - 3.6V
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*
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* ab3100 voltages:
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* 000 - 2.85V
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* 001 - 2.75V
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* 010 - 1.8V
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* 011 - 1.5V
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*/
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switch (voltage) {
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case 8:
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v = 3;
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break;
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case 9:
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case 10:
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case 11:
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case 12:
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case 13:
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case 14:
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case 15:
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v = 1;
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break;
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case 16:
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v = 1;
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break;
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case 17:
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case 18:
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case 19:
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case 20:
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case 21:
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case 22:
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case 23:
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case 24:
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v = 0;
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break;
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default:
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v = 0;
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break;
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}
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/* PL180 voltage register bits */
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return v << 2;
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}
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static int mmci_callback(void *data)
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{
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struct mmci_card_event *mmci_card = data;
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disable_irq_on_gpio_pin(U300_GPIO_PIN_MMC_CD);
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schedule_work(&mmci_card->workq);
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return 0;
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}
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static ssize_t gpio_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct mmci_card_event *mmci_card = container_of(
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dev->platform_data,
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struct mmci_card_event, mmc0_plat_data);
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return sprintf(buf, "%d\n", !mmci_card->mmc_inserted);
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}
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static DEVICE_ATTR(mmc_inserted, S_IRUGO, gpio_show, NULL);
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static void _mmci_callback(struct work_struct *ws)
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{
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struct mmci_card_event *mmci_card = container_of(
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ws,
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struct mmci_card_event, workq);
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mdelay(20);
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mmci_card->mmc_inserted = !!gpio_get_value(U300_GPIO_PIN_MMC_CD);
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input_report_switch(mmci_card->mmc_input, KEY_INSERT,
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!mmci_card->mmc_inserted);
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input_sync(mmci_card->mmc_input);
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pr_debug("MMC/SD card was %s\n",
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mmci_card->mmc_inserted ? "removed" : "inserted");
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enable_irq_on_gpio_pin(U300_GPIO_PIN_MMC_CD, !mmci_card->mmc_inserted);
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}
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int __devinit mmc_init(struct amba_device *adev)
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{
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struct mmci_card_event *mmci_card;
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struct device *mmcsd_device = &adev->dev;
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int ret = 0;
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mmci_card = kzalloc(sizeof(struct mmci_card_event), GFP_KERNEL);
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if (!mmci_card)
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return -ENOMEM;
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/* Nominally 2.85V on our platform */
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mmci_card->mmc0_plat_data.ocr_mask = MMC_VDD_28_29;
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mmci_card->mmc0_plat_data.translate_vdd = mmc_translate_vdd;
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mmci_card->mmc0_plat_data.status = mmc_status;
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mmcsd_device->platform_data = (void *) &mmci_card->mmc0_plat_data;
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INIT_WORK(&mmci_card->workq, _mmci_callback);
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ret = gpio_request(U300_GPIO_PIN_MMC_CD, "MMC card detection");
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if (ret) {
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printk(KERN_CRIT "Could not allocate MMC card detection " \
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"GPIO pin\n");
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goto out;
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}
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ret = gpio_direction_input(U300_GPIO_PIN_MMC_CD);
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if (ret) {
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printk(KERN_CRIT "Invalid GPIO pin requested\n");
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goto out;
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}
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ret = sysfs_create_file(&mmcsd_device->kobj,
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&dev_attr_mmc_inserted.attr);
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if (ret)
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goto out;
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mmci_card->mmc_input = input_allocate_device();
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if (!mmci_card->mmc_input) {
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printk(KERN_CRIT "Could not allocate MMC input device\n");
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return -ENOMEM;
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}
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mmci_card->mmc_input->name = "MMC insert notification";
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mmci_card->mmc_input->id.bustype = BUS_HOST;
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mmci_card->mmc_input->id.vendor = 0;
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mmci_card->mmc_input->id.product = 0;
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mmci_card->mmc_input->id.version = 0x0100;
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mmci_card->mmc_input->dev.parent = mmcsd_device;
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input_set_capability(mmci_card->mmc_input, EV_SW, KEY_INSERT);
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/*
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* Since this must always be compiled into the kernel, this input
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* is never unregistered or free:ed.
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*/
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ret = input_register_device(mmci_card->mmc_input);
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if (ret) {
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input_free_device(mmci_card->mmc_input);
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goto out;
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}
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input_set_drvdata(mmci_card->mmc_input, mmci_card);
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ret = gpio_register_callback(U300_GPIO_PIN_MMC_CD, mmci_callback,
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mmci_card);
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schedule_work(&mmci_card->workq);
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printk(KERN_INFO "Registered MMC insert/remove notification\n");
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out:
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return ret;
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}
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