mirror of
https://github.com/edk2-porting/linux-next.git
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9b7c18e070
Add the ability for the driver to put the card power regulators to sleep and wake them up again. Signed-off-by: Adrian Hunter <adrian.hunter@nokia.com> Acked-by: Matt Fleming <matt@console-pimps.org> Cc: Ian Molton <ian@mnementh.co.uk> Cc: "Roberto A. Foglietta" <roberto.foglietta@gmail.com> Cc: Jarkko Lavinen <jarkko.lavinen@nokia.com> Cc: Denis Karpov <ext-denis.2.karpov@nokia.com> Cc: Pierre Ossman <pierre@ossman.eu> Cc: Philip Langdale <philipl@overt.org> Cc: "Madhusudhan" <madhu.cr@ti.com> Cc: <linux-mmc@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
525 lines
13 KiB
C
525 lines
13 KiB
C
/*
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* linux/arch/arm/mach-omap2/mmc-twl4030.c
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*
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* Copyright (C) 2007-2008 Texas Instruments
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* Copyright (C) 2008 Nokia Corporation
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* Author: Texas Instruments
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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 version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/err.h>
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#include <linux/io.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/interrupt.h>
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#include <linux/delay.h>
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#include <linux/gpio.h>
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#include <linux/mmc/host.h>
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#include <linux/regulator/consumer.h>
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#include <mach/hardware.h>
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#include <mach/control.h>
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#include <mach/mmc.h>
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#include <mach/board.h>
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#include "mmc-twl4030.h"
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#if defined(CONFIG_REGULATOR) && \
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(defined(CONFIG_MMC_OMAP_HS) || defined(CONFIG_MMC_OMAP_HS_MODULE))
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static u16 control_pbias_offset;
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static u16 control_devconf1_offset;
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#define HSMMC_NAME_LEN 9
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static struct twl_mmc_controller {
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struct omap_mmc_platform_data *mmc;
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/* Vcc == configured supply
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* Vcc_alt == optional
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* - MMC1, supply for DAT4..DAT7
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* - MMC2/MMC2, external level shifter voltage supply, for
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* chip (SDIO, eMMC, etc) or transceiver (MMC2 only)
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*/
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struct regulator *vcc;
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struct regulator *vcc_aux;
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char name[HSMMC_NAME_LEN + 1];
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} hsmmc[OMAP34XX_NR_MMC];
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static int twl_mmc_card_detect(int irq)
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{
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unsigned i;
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for (i = 0; i < ARRAY_SIZE(hsmmc); i++) {
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struct omap_mmc_platform_data *mmc;
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mmc = hsmmc[i].mmc;
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if (!mmc)
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continue;
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if (irq != mmc->slots[0].card_detect_irq)
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continue;
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/* NOTE: assumes card detect signal is active-low */
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return !gpio_get_value_cansleep(mmc->slots[0].switch_pin);
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}
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return -ENOSYS;
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}
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static int twl_mmc_get_ro(struct device *dev, int slot)
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{
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struct omap_mmc_platform_data *mmc = dev->platform_data;
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/* NOTE: assumes write protect signal is active-high */
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return gpio_get_value_cansleep(mmc->slots[0].gpio_wp);
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}
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static int twl_mmc_get_cover_state(struct device *dev, int slot)
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{
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struct omap_mmc_platform_data *mmc = dev->platform_data;
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/* NOTE: assumes card detect signal is active-low */
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return !gpio_get_value_cansleep(mmc->slots[0].switch_pin);
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}
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/*
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* MMC Slot Initialization.
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*/
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static int twl_mmc_late_init(struct device *dev)
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{
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struct omap_mmc_platform_data *mmc = dev->platform_data;
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int ret = 0;
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int i;
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/* MMC/SD/SDIO doesn't require a card detect switch */
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if (gpio_is_valid(mmc->slots[0].switch_pin)) {
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ret = gpio_request(mmc->slots[0].switch_pin, "mmc_cd");
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if (ret)
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goto done;
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ret = gpio_direction_input(mmc->slots[0].switch_pin);
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if (ret)
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goto err;
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}
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/* require at least main regulator */
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for (i = 0; i < ARRAY_SIZE(hsmmc); i++) {
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if (hsmmc[i].name == mmc->slots[0].name) {
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struct regulator *reg;
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hsmmc[i].mmc = mmc;
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reg = regulator_get(dev, "vmmc");
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if (IS_ERR(reg)) {
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dev_dbg(dev, "vmmc regulator missing\n");
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/* HACK: until fixed.c regulator is usable,
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* we don't require a main regulator
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* for MMC2 or MMC3
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*/
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if (i != 0)
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break;
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ret = PTR_ERR(reg);
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hsmmc[i].vcc = NULL;
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goto err;
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}
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hsmmc[i].vcc = reg;
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mmc->slots[0].ocr_mask = mmc_regulator_get_ocrmask(reg);
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/* allow an aux regulator */
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reg = regulator_get(dev, "vmmc_aux");
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hsmmc[i].vcc_aux = IS_ERR(reg) ? NULL : reg;
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/* UGLY HACK: workaround regulator framework bugs.
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* When the bootloader leaves a supply active, it's
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* initialized with zero usecount ... and we can't
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* disable it without first enabling it. Until the
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* framework is fixed, we need a workaround like this
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* (which is safe for MMC, but not in general).
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*/
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if (regulator_is_enabled(hsmmc[i].vcc) > 0) {
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regulator_enable(hsmmc[i].vcc);
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regulator_disable(hsmmc[i].vcc);
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}
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if (hsmmc[i].vcc_aux) {
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if (regulator_is_enabled(reg) > 0) {
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regulator_enable(reg);
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regulator_disable(reg);
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}
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}
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break;
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}
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}
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return 0;
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err:
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gpio_free(mmc->slots[0].switch_pin);
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done:
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mmc->slots[0].card_detect_irq = 0;
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mmc->slots[0].card_detect = NULL;
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dev_err(dev, "err %d configuring card detect\n", ret);
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return ret;
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}
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static void twl_mmc_cleanup(struct device *dev)
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{
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struct omap_mmc_platform_data *mmc = dev->platform_data;
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int i;
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gpio_free(mmc->slots[0].switch_pin);
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for(i = 0; i < ARRAY_SIZE(hsmmc); i++) {
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regulator_put(hsmmc[i].vcc);
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regulator_put(hsmmc[i].vcc_aux);
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}
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}
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#ifdef CONFIG_PM
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static int twl_mmc_suspend(struct device *dev, int slot)
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{
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struct omap_mmc_platform_data *mmc = dev->platform_data;
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disable_irq(mmc->slots[0].card_detect_irq);
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return 0;
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}
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static int twl_mmc_resume(struct device *dev, int slot)
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{
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struct omap_mmc_platform_data *mmc = dev->platform_data;
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enable_irq(mmc->slots[0].card_detect_irq);
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return 0;
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}
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#else
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#define twl_mmc_suspend NULL
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#define twl_mmc_resume NULL
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#endif
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#if defined(CONFIG_ARCH_OMAP3) && defined(CONFIG_PM)
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static int twl4030_mmc_get_context_loss(struct device *dev)
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{
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/* FIXME: PM DPS not implemented yet */
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return 0;
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}
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#else
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#define twl4030_mmc_get_context_loss NULL
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#endif
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static int twl_mmc1_set_power(struct device *dev, int slot, int power_on,
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int vdd)
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{
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u32 reg;
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int ret = 0;
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struct twl_mmc_controller *c = &hsmmc[0];
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struct omap_mmc_platform_data *mmc = dev->platform_data;
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/*
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* Assume we power both OMAP VMMC1 (for CMD, CLK, DAT0..3) and the
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* card with Vcc regulator (from twl4030 or whatever). OMAP has both
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* 1.8V and 3.0V modes, controlled by the PBIAS register.
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*
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* In 8-bit modes, OMAP VMMC1A (for DAT4..7) needs a supply, which
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* is most naturally TWL VSIM; those pins also use PBIAS.
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*
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* FIXME handle VMMC1A as needed ...
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*/
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if (power_on) {
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if (cpu_is_omap2430()) {
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reg = omap_ctrl_readl(OMAP243X_CONTROL_DEVCONF1);
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if ((1 << vdd) >= MMC_VDD_30_31)
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reg |= OMAP243X_MMC1_ACTIVE_OVERWRITE;
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else
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reg &= ~OMAP243X_MMC1_ACTIVE_OVERWRITE;
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omap_ctrl_writel(reg, OMAP243X_CONTROL_DEVCONF1);
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}
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if (mmc->slots[0].internal_clock) {
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reg = omap_ctrl_readl(OMAP2_CONTROL_DEVCONF0);
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reg |= OMAP2_MMCSDIO1ADPCLKISEL;
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omap_ctrl_writel(reg, OMAP2_CONTROL_DEVCONF0);
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}
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reg = omap_ctrl_readl(control_pbias_offset);
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reg |= OMAP2_PBIASSPEEDCTRL0;
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reg &= ~OMAP2_PBIASLITEPWRDNZ0;
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omap_ctrl_writel(reg, control_pbias_offset);
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ret = mmc_regulator_set_ocr(c->vcc, vdd);
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/* 100ms delay required for PBIAS configuration */
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msleep(100);
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reg = omap_ctrl_readl(control_pbias_offset);
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reg |= (OMAP2_PBIASLITEPWRDNZ0 | OMAP2_PBIASSPEEDCTRL0);
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if ((1 << vdd) <= MMC_VDD_165_195)
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reg &= ~OMAP2_PBIASLITEVMODE0;
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else
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reg |= OMAP2_PBIASLITEVMODE0;
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omap_ctrl_writel(reg, control_pbias_offset);
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} else {
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reg = omap_ctrl_readl(control_pbias_offset);
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reg &= ~OMAP2_PBIASLITEPWRDNZ0;
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omap_ctrl_writel(reg, control_pbias_offset);
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ret = mmc_regulator_set_ocr(c->vcc, 0);
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/* 100ms delay required for PBIAS configuration */
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msleep(100);
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reg = omap_ctrl_readl(control_pbias_offset);
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reg |= (OMAP2_PBIASSPEEDCTRL0 | OMAP2_PBIASLITEPWRDNZ0 |
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OMAP2_PBIASLITEVMODE0);
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omap_ctrl_writel(reg, control_pbias_offset);
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}
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return ret;
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}
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static int twl_mmc23_set_power(struct device *dev, int slot, int power_on, int vdd)
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{
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int ret = 0;
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struct twl_mmc_controller *c = NULL;
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struct omap_mmc_platform_data *mmc = dev->platform_data;
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int i;
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for (i = 1; i < ARRAY_SIZE(hsmmc); i++) {
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if (mmc == hsmmc[i].mmc) {
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c = &hsmmc[i];
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break;
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}
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}
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if (c == NULL)
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return -ENODEV;
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/* If we don't see a Vcc regulator, assume it's a fixed
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* voltage always-on regulator.
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*/
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if (!c->vcc)
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return 0;
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/*
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* Assume Vcc regulator is used only to power the card ... OMAP
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* VDDS is used to power the pins, optionally with a transceiver to
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* support cards using voltages other than VDDS (1.8V nominal). When a
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* transceiver is used, DAT3..7 are muxed as transceiver control pins.
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*
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* In some cases this regulator won't support enable/disable;
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* e.g. it's a fixed rail for a WLAN chip.
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*
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* In other cases vcc_aux switches interface power. Example, for
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* eMMC cards it represents VccQ. Sometimes transceivers or SDIO
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* chips/cards need an interface voltage rail too.
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*/
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if (power_on) {
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/* only MMC2 supports a CLKIN */
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if (mmc->slots[0].internal_clock) {
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u32 reg;
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reg = omap_ctrl_readl(control_devconf1_offset);
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reg |= OMAP2_MMCSDIO2ADPCLKISEL;
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omap_ctrl_writel(reg, control_devconf1_offset);
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}
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ret = mmc_regulator_set_ocr(c->vcc, vdd);
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/* enable interface voltage rail, if needed */
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if (ret == 0 && c->vcc_aux) {
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ret = regulator_enable(c->vcc_aux);
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if (ret < 0)
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ret = mmc_regulator_set_ocr(c->vcc, 0);
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}
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} else {
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if (c->vcc_aux && (ret = regulator_is_enabled(c->vcc_aux)) > 0)
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ret = regulator_disable(c->vcc_aux);
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if (ret == 0)
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ret = mmc_regulator_set_ocr(c->vcc, 0);
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}
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return ret;
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}
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static int twl_mmc1_set_sleep(struct device *dev, int slot, int sleep, int vdd,
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int cardsleep)
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{
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struct twl_mmc_controller *c = &hsmmc[0];
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int mode = sleep ? REGULATOR_MODE_STANDBY : REGULATOR_MODE_NORMAL;
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return regulator_set_mode(c->vcc, mode);
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}
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static int twl_mmc23_set_sleep(struct device *dev, int slot, int sleep, int vdd,
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int cardsleep)
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{
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struct twl_mmc_controller *c = NULL;
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struct omap_mmc_platform_data *mmc = dev->platform_data;
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int i, err, mode;
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for (i = 1; i < ARRAY_SIZE(hsmmc); i++) {
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if (mmc == hsmmc[i].mmc) {
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c = &hsmmc[i];
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break;
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}
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}
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if (c == NULL)
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return -ENODEV;
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/*
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* If we don't see a Vcc regulator, assume it's a fixed
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* voltage always-on regulator.
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*/
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if (!c->vcc)
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return 0;
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mode = sleep ? REGULATOR_MODE_STANDBY : REGULATOR_MODE_NORMAL;
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if (!c->vcc_aux)
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return regulator_set_mode(c->vcc, mode);
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if (cardsleep) {
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/* VCC can be turned off if card is asleep */
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struct regulator *vcc_aux = c->vcc_aux;
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c->vcc_aux = NULL;
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if (sleep)
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err = twl_mmc23_set_power(dev, slot, 0, 0);
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else
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err = twl_mmc23_set_power(dev, slot, 1, vdd);
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c->vcc_aux = vcc_aux;
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} else
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err = regulator_set_mode(c->vcc, mode);
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if (err)
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return err;
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return regulator_set_mode(c->vcc_aux, mode);
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}
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static struct omap_mmc_platform_data *hsmmc_data[OMAP34XX_NR_MMC] __initdata;
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void __init twl4030_mmc_init(struct twl4030_hsmmc_info *controllers)
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{
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struct twl4030_hsmmc_info *c;
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int nr_hsmmc = ARRAY_SIZE(hsmmc_data);
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if (cpu_is_omap2430()) {
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control_pbias_offset = OMAP243X_CONTROL_PBIAS_LITE;
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control_devconf1_offset = OMAP243X_CONTROL_DEVCONF1;
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nr_hsmmc = 2;
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} else {
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control_pbias_offset = OMAP343X_CONTROL_PBIAS_LITE;
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control_devconf1_offset = OMAP343X_CONTROL_DEVCONF1;
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}
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for (c = controllers; c->mmc; c++) {
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struct twl_mmc_controller *twl = hsmmc + c->mmc - 1;
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struct omap_mmc_platform_data *mmc = hsmmc_data[c->mmc - 1];
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if (!c->mmc || c->mmc > nr_hsmmc) {
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pr_debug("MMC%d: no such controller\n", c->mmc);
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continue;
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}
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if (mmc) {
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pr_debug("MMC%d: already configured\n", c->mmc);
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continue;
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}
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mmc = kzalloc(sizeof(struct omap_mmc_platform_data), GFP_KERNEL);
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if (!mmc) {
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pr_err("Cannot allocate memory for mmc device!\n");
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return;
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}
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if (c->name)
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strncpy(twl->name, c->name, HSMMC_NAME_LEN);
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else
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snprintf(twl->name, ARRAY_SIZE(twl->name),
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"mmc%islot%i", c->mmc, 1);
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mmc->slots[0].name = twl->name;
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mmc->nr_slots = 1;
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mmc->slots[0].wires = c->wires;
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mmc->slots[0].internal_clock = !c->ext_clock;
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mmc->dma_mask = 0xffffffff;
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mmc->init = twl_mmc_late_init;
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/* note: twl4030 card detect GPIOs can disable VMMCx ... */
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if (gpio_is_valid(c->gpio_cd)) {
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mmc->cleanup = twl_mmc_cleanup;
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mmc->suspend = twl_mmc_suspend;
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mmc->resume = twl_mmc_resume;
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mmc->slots[0].switch_pin = c->gpio_cd;
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mmc->slots[0].card_detect_irq = gpio_to_irq(c->gpio_cd);
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if (c->cover_only)
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mmc->slots[0].get_cover_state = twl_mmc_get_cover_state;
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else
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mmc->slots[0].card_detect = twl_mmc_card_detect;
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} else
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mmc->slots[0].switch_pin = -EINVAL;
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mmc->get_context_loss_count =
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twl4030_mmc_get_context_loss;
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/* write protect normally uses an OMAP gpio */
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if (gpio_is_valid(c->gpio_wp)) {
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gpio_request(c->gpio_wp, "mmc_wp");
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gpio_direction_input(c->gpio_wp);
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mmc->slots[0].gpio_wp = c->gpio_wp;
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mmc->slots[0].get_ro = twl_mmc_get_ro;
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} else
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mmc->slots[0].gpio_wp = -EINVAL;
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if (c->nonremovable)
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mmc->slots[0].nonremovable = 1;
|
|
|
|
if (c->power_saving)
|
|
mmc->slots[0].power_saving = 1;
|
|
|
|
/* NOTE: MMC slots should have a Vcc regulator set up.
|
|
* This may be from a TWL4030-family chip, another
|
|
* controllable regulator, or a fixed supply.
|
|
*
|
|
* temporary HACK: ocr_mask instead of fixed supply
|
|
*/
|
|
mmc->slots[0].ocr_mask = c->ocr_mask;
|
|
|
|
switch (c->mmc) {
|
|
case 1:
|
|
/* on-chip level shifting via PBIAS0/PBIAS1 */
|
|
mmc->slots[0].set_power = twl_mmc1_set_power;
|
|
mmc->slots[0].set_sleep = twl_mmc1_set_sleep;
|
|
break;
|
|
case 2:
|
|
if (c->ext_clock)
|
|
c->transceiver = 1;
|
|
if (c->transceiver && c->wires > 4)
|
|
c->wires = 4;
|
|
/* FALLTHROUGH */
|
|
case 3:
|
|
/* off-chip level shifting, or none */
|
|
mmc->slots[0].set_power = twl_mmc23_set_power;
|
|
mmc->slots[0].set_sleep = twl_mmc23_set_sleep;
|
|
break;
|
|
default:
|
|
pr_err("MMC%d configuration not supported!\n", c->mmc);
|
|
kfree(mmc);
|
|
continue;
|
|
}
|
|
hsmmc_data[c->mmc - 1] = mmc;
|
|
}
|
|
|
|
omap2_init_mmc(hsmmc_data, OMAP34XX_NR_MMC);
|
|
|
|
/* pass the device nodes back to board setup code */
|
|
for (c = controllers; c->mmc; c++) {
|
|
struct omap_mmc_platform_data *mmc = hsmmc_data[c->mmc - 1];
|
|
|
|
if (!c->mmc || c->mmc > nr_hsmmc)
|
|
continue;
|
|
c->dev = mmc->dev;
|
|
}
|
|
}
|
|
|
|
#endif
|