openwrtv3/target/linux/brcm63xx/patches-3.18/375-MIPS-BCM63XX-switch-to-new-gpio-driver.patch

From cc99dca188bb63ba390008e2f7fa62d0300233e0 Mon Sep 17 00:00:00 2001
From: Jonas Gorski <jogo@openwrt.org>
Date: Fri, 20 Feb 2015 23:58:54 +0100
Subject: [PATCH 2/6] MIPS: BCM63XX: switch to new gpio driver

Signed-off-by: Jonas Gorski <jogo@openwrt.org>
---
 arch/mips/bcm63xx/boards/board_common.c |    2 +
 arch/mips/bcm63xx/gpio.c                |  147 +++++++------------------------
 arch/mips/bcm63xx/prom.c                |    3 -
 3 files changed, 33 insertions(+), 119 deletions(-)

--- a/arch/mips/bcm63xx/boards/board_common.c
+++ b/arch/mips/bcm63xx/boards/board_common.c
@@ -204,6 +204,8 @@ int __init board_register_devices(void)
 	}
 #endif
 
+	bcm63xx_gpio_init();
+
 	if (board.has_uart0)
 		bcm63xx_uart_register(0);
 
--- a/arch/mips/bcm63xx/gpio.c
+++ b/arch/mips/bcm63xx/gpio.c
@@ -5,147 +5,62 @@
  *
  * Copyright (C) 2008 Maxime Bizon <mbizon@freebox.fr>
  * Copyright (C) 2008-2011 Florian Fainelli <florian@openwrt.org>
+ * Copyright (C) Jonas Gorski <jogo@openwrt.org>
  */
 
 #include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/spinlock.h>
 #include <linux/platform_device.h>
+#include <linux/basic_mmio_gpio.h>
 #include <linux/gpio.h>
 
 #include <bcm63xx_cpu.h>
 #include <bcm63xx_gpio.h>
-#include <bcm63xx_io.h>
 #include <bcm63xx_regs.h>
 
-static u32 gpio_out_low_reg;
-
-static void bcm63xx_gpio_out_low_reg_init(void)
+static void __init bcm63xx_gpio_init_one(int id, int dir, int data, int ngpio)
 {
-	switch (bcm63xx_get_cpu_id()) {
-	case BCM6345_CPU_ID:
-		gpio_out_low_reg = GPIO_DATA_LO_REG_6345;
-		break;
-	default:
-		gpio_out_low_reg = GPIO_DATA_LO_REG;
-		break;
-	}
-}
-
-static DEFINE_SPINLOCK(bcm63xx_gpio_lock);
-static u32 gpio_out_low, gpio_out_high;
+	struct resource res[2];
+	struct bgpio_pdata pdata;
 
-static void bcm63xx_gpio_set(struct gpio_chip *chip,
-			     unsigned gpio, int val)
-{
-	u32 reg;
-	u32 mask;
-	u32 *v;
-	unsigned long flags;
-
-	if (gpio >= chip->ngpio)
-		BUG();
-
-	if (gpio < 32) {
-		reg = gpio_out_low_reg;
-		mask = 1 << gpio;
-		v = &gpio_out_low;
-	} else {
-		reg = GPIO_DATA_HI_REG;
-		mask = 1 << (gpio - 32);
-		v = &gpio_out_high;
-	}
-
-	spin_lock_irqsave(&bcm63xx_gpio_lock, flags);
-	if (val)
-		*v |= mask;
-	else
-		*v &= ~mask;
-	bcm_gpio_writel(*v, reg);
-	spin_unlock_irqrestore(&bcm63xx_gpio_lock, flags);
-}
+	memset(res, 0, sizeof(res));
+	memset(&pdata, 0, sizeof(pdata));
 
-static int bcm63xx_gpio_get(struct gpio_chip *chip, unsigned gpio)
-{
-	u32 reg;
-	u32 mask;
+	res[0].flags = IORESOURCE_MEM;
+	res[0].start = bcm63xx_regset_address(RSET_GPIO);
+	res[0].start += dir;
 
-	if (gpio >= chip->ngpio)
-		BUG();
+	res[0].end = res[0].start + 3;
 
-	if (gpio < 32) {
-		reg = gpio_out_low_reg;
-		mask = 1 << gpio;
-	} else {
-		reg = GPIO_DATA_HI_REG;
-		mask = 1 << (gpio - 32);
-	}
+	res[1].flags = IORESOURCE_MEM;
+	res[1].start = bcm63xx_regset_address(RSET_GPIO);
+	res[1].start += data;
 
-	return !!(bcm_gpio_readl(reg) & mask);
-}
+	res[1].end = res[1].start + 3;
 
-static int bcm63xx_gpio_set_direction(struct gpio_chip *chip,
-				      unsigned gpio, int dir)
-{
-	u32 reg;
-	u32 mask;
-	u32 tmp;
-	unsigned long flags;
-
-	if (gpio >= chip->ngpio)
-		BUG();
-
-	if (gpio < 32) {
-		reg = GPIO_CTL_LO_REG;
-		mask = 1 << gpio;
-	} else {
-		reg = GPIO_CTL_HI_REG;
-		mask = 1 << (gpio - 32);
-	}
-
-	spin_lock_irqsave(&bcm63xx_gpio_lock, flags);
-	tmp = bcm_gpio_readl(reg);
-	if (dir == BCM63XX_GPIO_DIR_IN)
-		tmp &= ~mask;
-	else
-		tmp |= mask;
-	bcm_gpio_writel(tmp, reg);
-	spin_unlock_irqrestore(&bcm63xx_gpio_lock, flags);
+	pdata.base = id * 32;
+	pdata.ngpio = ngpio;
 
-	return 0;
+	platform_device_register_resndata(NULL, "bcm63xx-gpio", id, res, 2,
+					  &pdata, sizeof(pdata));
 }
 
-static int bcm63xx_gpio_direction_input(struct gpio_chip *chip, unsigned gpio)
+int __init bcm63xx_gpio_init(void)
 {
-	return bcm63xx_gpio_set_direction(chip, gpio, BCM63XX_GPIO_DIR_IN);
-}
+	int ngpio = bcm63xx_gpio_count();
+	int data_low_reg;
 
-static int bcm63xx_gpio_direction_output(struct gpio_chip *chip,
-					 unsigned gpio, int value)
-{
-	bcm63xx_gpio_set(chip, gpio, value);
-	return bcm63xx_gpio_set_direction(chip, gpio, BCM63XX_GPIO_DIR_OUT);
-}
+	if (BCMCPU_IS_6345())
+		data_low_reg = GPIO_DATA_LO_REG_6345;
+	else
+		data_low_reg = GPIO_DATA_LO_REG;
 
+	bcm63xx_gpio_init_one(0, GPIO_CTL_LO_REG, data_low_reg, min(ngpio, 32));
 
-static struct gpio_chip bcm63xx_gpio_chip = {
-	.label			= "bcm63xx-gpio",
-	.direction_input	= bcm63xx_gpio_direction_input,
-	.direction_output	= bcm63xx_gpio_direction_output,
-	.get			= bcm63xx_gpio_get,
-	.set			= bcm63xx_gpio_set,
-	.base			= 0,
-};
+	if (ngpio <= 32)
+		return 0;
 
-int __init bcm63xx_gpio_init(void)
-{
-	bcm63xx_gpio_out_low_reg_init();
+	bcm63xx_gpio_init_one(1, GPIO_CTL_HI_REG, GPIO_DATA_HI_REG, ngpio - 32);
 
-	gpio_out_low = bcm_gpio_readl(gpio_out_low_reg);
-	if (!BCMCPU_IS_6345())
-		gpio_out_high = bcm_gpio_readl(GPIO_DATA_HI_REG);
-	bcm63xx_gpio_chip.ngpio = bcm63xx_gpio_count();
-	pr_info("registering %d GPIOs\n", bcm63xx_gpio_chip.ngpio);
+	return 0;
 
-	return gpiochip_add(&bcm63xx_gpio_chip);
 }
--- a/arch/mips/bcm63xx/prom.c
+++ b/arch/mips/bcm63xx/prom.c
@@ -54,9 +54,6 @@ void __init prom_init(void)
 	reg &= ~mask;
 	bcm_perf_writel(reg, PERF_CKCTL_REG);
 
-	/* register gpiochip */
-	bcm63xx_gpio_init();
-
 	/* detect and setup flash access */
 	bcm63xx_flash_detect();