mirror of
https://github.com/edk2-porting/linux-next.git
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ARM: 5666/1: Revamped U300 padmux API
This abstracts the hackish padmux API on the U300 platform into something more manageable. It provides a way for drivers to activate/deactivate a certain padmux setting. It will also switch the users of the old API over to using the new style, pushing muxing into the apropriate setup files. Signed-off-by: Linus Walleij <linus.walleij@stericsson.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Linus Walleij
Russell King
parent
5ad73d0717
commit
df1e0520f9
@ -25,11 +25,6 @@
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#include <linux/platform_device.h>
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#include <linux/gpio.h>
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/* Need access to SYSCON registers for PADmuxing */
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#include <mach/syscon.h>
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#include "padmux.h"
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/* Reference to GPIO block clock */
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static struct clk *clk;
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@ -606,14 +601,6 @@ static int __init gpio_probe(struct platform_device *pdev)
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writel(U300_GPIO_CR_BLOCK_CLKRQ_ENABLE, virtbase + U300_GPIO_CR);
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#endif
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/* Set up some padmuxing here */
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#ifdef CONFIG_MMC
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pmx_set_mission_mode_mmc();
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#endif
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#ifdef CONFIG_SPI_PL022
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pmx_set_mission_mode_spi();
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#endif
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gpio_set_initial_values();
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for (num_irqs = 0 ; num_irqs < U300_GPIO_NUM_PORTS; num_irqs++) {
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@ -22,6 +22,7 @@
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#include <asm/mach/mmc.h>
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#include "mmc.h"
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#include "padmux.h"
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struct mmci_card_event {
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struct input_dev *mmc_input;
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@ -146,6 +147,7 @@ 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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struct pmx *pmx;
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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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@ -205,6 +207,20 @@ int __devinit mmc_init(struct amba_device *adev)
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input_set_drvdata(mmci_card->mmc_input, mmci_card);
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/*
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* Setup padmuxing for MMC. Since this must always be
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* compiled into the kernel, pmx is never released.
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*/
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pmx = pmx_get(mmcsd_device, U300_APP_PMX_MMC_SETTING);
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if (IS_ERR(pmx))
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pr_warning("Could not get padmux handle\n");
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else {
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ret = pmx_activate(mmcsd_device, pmx);
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if (IS_ERR_VALUE(ret))
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pr_warning("Could not activate padmuxing\n");
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}
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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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@ -6,53 +6,362 @@
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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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* U300 PADMUX functions
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* Author: Linus Walleij <linus.walleij@stericsson.com>
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*
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* Author: Martin Persson <martin.persson@stericsson.com>
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*/
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#include <linux/io.h>
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/device.h>
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#include <linux/err.h>
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#include <linux/errno.h>
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#include <linux/io.h>
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#include <linux/mutex.h>
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#include <linux/string.h>
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#include <linux/bug.h>
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#include <linux/debugfs.h>
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#include <linux/seq_file.h>
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#include <mach/u300-regs.h>
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#include <mach/syscon.h>
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#include "padmux.h"
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/* Set the PAD MUX to route the MMC reader correctly to GPIO0. */
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void pmx_set_mission_mode_mmc(void)
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{
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u16 val;
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static DEFINE_MUTEX(pmx_mutex);
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val = readw(U300_SYSCON_VBASE + U300_SYSCON_PMC1LR);
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val &= ~U300_SYSCON_PMC1LR_MMCSD_MASK;
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writew(val, U300_SYSCON_VBASE + U300_SYSCON_PMC1LR);
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val = readw(U300_SYSCON_VBASE + U300_SYSCON_PMC1HR);
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val &= ~U300_SYSCON_PMC1HR_APP_GPIO_1_MASK;
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val |= U300_SYSCON_PMC1HR_APP_GPIO_1_MMC;
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writew(val, U300_SYSCON_VBASE + U300_SYSCON_PMC1HR);
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const u32 pmx_registers[] = {
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(U300_SYSCON_VBASE + U300_SYSCON_PMC1LR),
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(U300_SYSCON_VBASE + U300_SYSCON_PMC1HR),
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(U300_SYSCON_VBASE + U300_SYSCON_PMC2R),
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(U300_SYSCON_VBASE + U300_SYSCON_PMC3R),
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(U300_SYSCON_VBASE + U300_SYSCON_PMC4R)
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};
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/* High level functionality */
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/* Lazy dog:
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* onmask = {
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* {"PMC1LR" mask, "PMC1LR" value},
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* {"PMC1HR" mask, "PMC1HR" value},
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* {"PMC2R" mask, "PMC2R" value},
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* {"PMC3R" mask, "PMC3R" value},
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* {"PMC4R" mask, "PMC4R" value}
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* }
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*/
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static struct pmx mmc_setting = {
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.setting = U300_APP_PMX_MMC_SETTING,
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.default_on = false,
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.activated = false,
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.name = "MMC",
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.onmask = {
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{U300_SYSCON_PMC1LR_MMCSD_MASK,
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U300_SYSCON_PMC1LR_MMCSD_MMCSD},
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{0, 0},
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{0, 0},
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{0, 0},
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{U300_SYSCON_PMC4R_APP_MISC_12_MASK,
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U300_SYSCON_PMC4R_APP_MISC_12_APP_GPIO}
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},
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};
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static struct pmx spi_setting = {
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.setting = U300_APP_PMX_SPI_SETTING,
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.default_on = false,
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.activated = false,
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.name = "SPI",
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.onmask = {{0, 0},
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{U300_SYSCON_PMC1HR_APP_SPI_2_MASK |
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U300_SYSCON_PMC1HR_APP_SPI_CS_1_MASK |
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U300_SYSCON_PMC1HR_APP_SPI_CS_2_MASK,
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U300_SYSCON_PMC1HR_APP_SPI_2_SPI |
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U300_SYSCON_PMC1HR_APP_SPI_CS_1_SPI |
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U300_SYSCON_PMC1HR_APP_SPI_CS_2_SPI},
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{0, 0},
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{0, 0},
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{0, 0}
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},
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};
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/* Available padmux settings */
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static struct pmx *pmx_settings[] = {
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&mmc_setting,
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&spi_setting,
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};
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static void update_registers(struct pmx *pmx, bool activate)
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{
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u16 regval, val, mask;
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int i;
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for (i = 0; i < ARRAY_SIZE(pmx_registers); i++) {
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if (activate)
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val = pmx->onmask[i].val;
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else
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val = 0;
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mask = pmx->onmask[i].mask;
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if (mask != 0) {
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regval = readw(pmx_registers[i]);
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regval &= ~mask;
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regval |= val;
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writew(regval, pmx_registers[i]);
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}
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}
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}
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void pmx_set_mission_mode_spi(void)
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struct pmx *pmx_get(struct device *dev, enum pmx_settings setting)
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{
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u16 val;
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int i;
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struct pmx *pmx = ERR_PTR(-ENOENT);
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/* Set up padmuxing so the SPI port and its chipselects are active */
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val = readw(U300_SYSCON_VBASE + U300_SYSCON_PMC1HR);
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/*
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* Activate the SPI port (disable the use of these pins for generic
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* GPIO, DSP, AAIF
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*/
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val &= ~U300_SYSCON_PMC1HR_APP_SPI_2_MASK;
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val |= U300_SYSCON_PMC1HR_APP_SPI_2_SPI;
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/*
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* Use GPIO pin SPI CS1 for CS1 actually (it can be used for other
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* things also)
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*/
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val &= ~U300_SYSCON_PMC1HR_APP_SPI_CS_1_MASK;
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val |= U300_SYSCON_PMC1HR_APP_SPI_CS_1_SPI;
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/*
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* Use GPIO pin SPI CS2 for CS2 actually (it can be used for other
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* things also)
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*/
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val &= ~U300_SYSCON_PMC1HR_APP_SPI_CS_2_MASK;
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val |= U300_SYSCON_PMC1HR_APP_SPI_CS_2_SPI;
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writew(val, U300_SYSCON_VBASE + U300_SYSCON_PMC1HR);
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if (dev == NULL)
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return ERR_PTR(-EINVAL);
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mutex_lock(&pmx_mutex);
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for (i = 0; i < ARRAY_SIZE(pmx_settings); i++) {
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if (setting == pmx_settings[i]->setting) {
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if (pmx_settings[i]->dev != NULL) {
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WARN(1, "padmux: required setting "
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"in use by another consumer\n");
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} else {
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pmx = pmx_settings[i];
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pmx->dev = dev;
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dev_dbg(dev, "padmux: setting nr %d is now "
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"bound to %s and ready to use\n",
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setting, dev_name(dev));
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break;
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}
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}
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}
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mutex_unlock(&pmx_mutex);
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return pmx;
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}
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EXPORT_SYMBOL(pmx_get);
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int pmx_put(struct device *dev, struct pmx *pmx)
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{
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int i;
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int ret = -ENOENT;
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if (pmx == NULL || dev == NULL)
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return -EINVAL;
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mutex_lock(&pmx_mutex);
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for (i = 0; i < ARRAY_SIZE(pmx_settings); i++) {
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if (pmx->setting == pmx_settings[i]->setting) {
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if (dev != pmx->dev) {
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WARN(1, "padmux: cannot release handle as "
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"it is bound to another consumer\n");
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ret = -EINVAL;
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break;
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} else {
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pmx_settings[i]->dev = NULL;
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ret = 0;
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break;
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}
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}
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}
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mutex_unlock(&pmx_mutex);
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return ret;
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}
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EXPORT_SYMBOL(pmx_put);
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int pmx_activate(struct device *dev, struct pmx *pmx)
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{
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int i, j, ret;
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ret = 0;
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if (pmx == NULL || dev == NULL)
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return -EINVAL;
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mutex_lock(&pmx_mutex);
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/* Make sure the required bits are not used */
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for (i = 0; i < ARRAY_SIZE(pmx_settings); i++) {
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if (pmx_settings[i]->dev == NULL || pmx_settings[i] == pmx)
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continue;
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for (j = 0; j < ARRAY_SIZE(pmx_registers); j++) {
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if (pmx_settings[i]->onmask[j].mask & pmx->
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onmask[j].mask) {
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/* More than one entry on the same bits */
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WARN(1, "padmux: cannot activate "
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"setting. Bit conflict with "
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"an active setting\n");
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ret = -EUSERS;
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goto exit;
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}
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}
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}
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update_registers(pmx, true);
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pmx->activated = true;
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dev_dbg(dev, "padmux: setting nr %d is activated\n",
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pmx->setting);
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exit:
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mutex_unlock(&pmx_mutex);
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return ret;
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}
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EXPORT_SYMBOL(pmx_activate);
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int pmx_deactivate(struct device *dev, struct pmx *pmx)
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{
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int i;
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int ret = -ENOENT;
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if (pmx == NULL || dev == NULL)
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return -EINVAL;
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mutex_lock(&pmx_mutex);
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for (i = 0; i < ARRAY_SIZE(pmx_settings); i++) {
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if (pmx_settings[i]->dev == NULL)
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continue;
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if (pmx->setting == pmx_settings[i]->setting) {
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if (dev != pmx->dev) {
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WARN(1, "padmux: cannot deactivate "
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"pmx setting as it was activated "
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"by another consumer\n");
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ret = -EBUSY;
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continue;
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} else {
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update_registers(pmx, false);
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pmx_settings[i]->dev = NULL;
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pmx->activated = false;
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ret = 0;
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dev_dbg(dev, "padmux: setting nr %d is deactivated",
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pmx->setting);
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break;
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}
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}
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}
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mutex_unlock(&pmx_mutex);
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return ret;
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}
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EXPORT_SYMBOL(pmx_deactivate);
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/*
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* For internal use only. If it is to be exported,
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* it should be reentrant. Notice that pmx_activate
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* (i.e. runtime settings) always override default settings.
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*/
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static int pmx_set_default(void)
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{
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/* Used to identify several entries on the same bits */
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u16 modbits[ARRAY_SIZE(pmx_registers)];
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int i, j;
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memset(modbits, 0, ARRAY_SIZE(pmx_registers) * sizeof(u16));
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for (i = 0; i < ARRAY_SIZE(pmx_settings); i++) {
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if (!pmx_settings[i]->default_on)
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continue;
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for (j = 0; j < ARRAY_SIZE(pmx_registers); j++) {
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/* Make sure there is only one entry on the same bits */
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if (modbits[j] & pmx_settings[i]->onmask[j].mask) {
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BUG();
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return -EUSERS;
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}
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modbits[j] |= pmx_settings[i]->onmask[j].mask;
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}
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update_registers(pmx_settings[i], true);
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}
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return 0;
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}
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#if (defined(CONFIG_DEBUG_FS) && defined(CONFIG_U300_DEBUG))
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static int pmx_show(struct seq_file *s, void *data)
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{
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int i;
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seq_printf(s, "-------------------------------------------------\n");
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seq_printf(s, "SETTING BOUND TO DEVICE STATE\n");
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seq_printf(s, "-------------------------------------------------\n");
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mutex_lock(&pmx_mutex);
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for (i = 0; i < ARRAY_SIZE(pmx_settings); i++) {
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/* Format pmx and device name nicely */
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char cdp[33];
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int chars;
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chars = snprintf(&cdp[0], 17, "%s", pmx_settings[i]->name);
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while (chars < 16) {
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cdp[chars] = ' ';
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chars++;
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}
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chars = snprintf(&cdp[16], 17, "%s", pmx_settings[i]->dev ?
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dev_name(pmx_settings[i]->dev) : "N/A");
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while (chars < 16) {
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cdp[chars+16] = ' ';
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chars++;
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}
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cdp[32] = '\0';
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seq_printf(s,
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"%s\t%s\n",
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&cdp[0],
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pmx_settings[i]->activated ?
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"ACTIVATED" : "DEACTIVATED"
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);
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}
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mutex_unlock(&pmx_mutex);
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return 0;
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}
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static int pmx_open(struct inode *inode, struct file *file)
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{
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return single_open(file, pmx_show, NULL);
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}
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static const struct file_operations pmx_operations = {
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.owner = THIS_MODULE,
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.open = pmx_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = single_release,
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};
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static int __init init_pmx_read_debugfs(void)
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{
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/* Expose a simple debugfs interface to view pmx settings */
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(void) debugfs_create_file("padmux", S_IFREG | S_IRUGO,
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NULL, NULL,
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&pmx_operations);
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return 0;
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}
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/*
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* This needs to come in after the core_initcall(),
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* because debugfs is not available until
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* the subsystems come up.
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*/
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module_init(init_pmx_read_debugfs);
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#endif
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static int __init pmx_init(void)
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{
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int ret;
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ret = pmx_set_default();
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if (IS_ERR_VALUE(ret))
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pr_crit("padmux: default settings could not be set\n");
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return 0;
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}
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/* Should be initialized before consumers */
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core_initcall(pmx_init);
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@ -6,14 +6,34 @@
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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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* U300 PADMUX API
|
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* Author: Linus Walleij <linus.walleij@stericsson.com>
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*
|
||||
* Author: Martin Persson <martin.persson@stericsson.com>
|
||||
*/
|
||||
|
||||
#ifndef __MACH_U300_PADMUX_H
|
||||
#define __MACH_U300_PADMUX_H
|
||||
|
||||
void pmx_set_mission_mode_mmc(void);
|
||||
void pmx_set_mission_mode_spi(void);
|
||||
enum pmx_settings {
|
||||
U300_APP_PMX_MMC_SETTING,
|
||||
U300_APP_PMX_SPI_SETTING
|
||||
};
|
||||
|
||||
struct pmx_onmask {
|
||||
u16 mask; /* Mask bits */
|
||||
u16 val; /* Value when active */
|
||||
};
|
||||
|
||||
struct pmx {
|
||||
struct device *dev;
|
||||
enum pmx_settings setting;
|
||||
char *name;
|
||||
bool activated;
|
||||
bool default_on;
|
||||
struct pmx_onmask onmask[];
|
||||
};
|
||||
|
||||
struct pmx *pmx_get(struct device *dev, enum pmx_settings setting);
|
||||
int pmx_put(struct device *dev, struct pmx *pmx);
|
||||
int pmx_activate(struct device *dev, struct pmx *pmx);
|
||||
int pmx_deactivate(struct device *dev, struct pmx *pmx);
|
||||
|
||||
#endif
|
||||
|
||||
Loading…
Reference in New Issue
Block a user