Re: [PATCH -mm 3/5] asic3: New gpio configuration code

From: pHilipp Zabel
Date: Sat Jun 21 2008 - 10:44:01 EST

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On Sun, May 11, 2008 at 7:36 PM, Samuel Ortiz <sameo@xxxxxxxxxxxxxx> wrote:
> The ASIC3 GPIO configuration code is a bit obscure and hardly readable.
> This patch changes it so that it is now more readable and understandable,
> by being more explicit.
>
> Signed-off-by: Samuel Ortiz <sameo@xxxxxxxxxxxxxx>
> ---
> drivers/mfd/asic3.c | 99 +++++++++++++++++++---------------------------
> include/linux/mfd/asic3.h | 34 +++++++++++----
> 2 files changed, 67 insertions(+), 66 deletions(-)
>
> Index: linux-2.6-htc-asic3/drivers/mfd/asic3.c
> ===================================================================
> --- linux-2.6-htc-asic3.orig/drivers/mfd/asic3.c 2008-05-11 17:47:15.000000000 +0200
> +++ linux-2.6-htc-asic3/drivers/mfd/asic3.c 2008-05-11 18:20:35.000000000 +0200
> @@ -465,69 +465,54 @@ static void asic3_gpio_set(struct gpio_c
> return;
> }
>
> -static inline u32 asic3_get_gpio(struct asic3 *asic, unsigned int base,
> - unsigned int function)
> +static int asic3_gpio_probe(struct platform_device *pdev,
> + u16 *gpio_config, int num)
> {
> - return asic3_read_register(asic, base + function);
> -}
> -
> -static void asic3_set_gpio(struct asic3 *asic, unsigned int base,
> - unsigned int function, u32 bits, u32 val)
> -{
> - unsigned long flags;
> -
> - spin_lock_irqsave(&asic->lock, flags);
> - val |= (asic3_read_register(asic, base + function) & ~bits);
> -
> - asic3_write_register(asic, base + function, val);
> - spin_unlock_irqrestore(&asic->lock, flags);
> -}
> -
> -#define asic3_set_gpio_a(asic, fn, bits, val) \
> - asic3_set_gpio(asic, ASIC3_GPIO_A_Base, ASIC3_GPIO_##fn, bits, val)
> -#define asic3_set_gpio_b(asic, fn, bits, val) \
> - asic3_set_gpio(asic, ASIC3_GPIO_B_Base, ASIC3_GPIO_##fn, bits, val)
> -#define asic3_set_gpio_c(asic, fn, bits, val) \
> - asic3_set_gpio(asic, ASIC3_GPIO_C_Base, ASIC3_GPIO_##fn, bits, val)
> -#define asic3_set_gpio_d(asic, fn, bits, val) \
> - asic3_set_gpio(asic, ASIC3_GPIO_D_Base, ASIC3_GPIO_##fn, bits, val)
> -
> -#define asic3_set_gpio_banks(asic, fn, bits, pdata, field) \
> - do { \
> - asic3_set_gpio_a((asic), fn, (bits), (pdata)->gpio_a.field); \
> - asic3_set_gpio_b((asic), fn, (bits), (pdata)->gpio_b.field); \
> - asic3_set_gpio_c((asic), fn, (bits), (pdata)->gpio_c.field); \
> - asic3_set_gpio_d((asic), fn, (bits), (pdata)->gpio_d.field); \
> - } while (0)
> -
> -
> -static int asic3_gpio_probe(struct platform_device *pdev)
> -{
> - struct asic3_platform_data *pdata = pdev->dev.platform_data;
> struct asic3 *asic = platform_get_drvdata(pdev);
> + u16 alt_reg[ASIC3_NUM_GPIO_BANKS];
> + u16 out_reg[ASIC3_NUM_GPIO_BANKS];
> + u16 dir_reg[ASIC3_NUM_GPIO_BANKS];
> + int i;
> +
> + memset(alt_reg, 0, ASIC3_NUM_GPIO_BANKS);
> + memset(out_reg, 0, ASIC3_NUM_GPIO_BANKS);
> + memset(dir_reg, 0, ASIC3_NUM_GPIO_BANKS);

Those should be
memset(alt_reg, 0, ASIC3_NUM_GPIO_BANKS*sizeof(u16));
memset(out_reg, 0, ASIC3_NUM_GPIO_BANKS*sizeof(u16));
memset(dir_reg, 0, ASIC3_NUM_GPIO_BANKS*sizeof(u16));

With that change,
Tested-by: Philipp Zabel <philipp.zabel@xxxxxxxxx>

This is the configuration I'm using for hx4700 currently:

u16 asic3_gpio_config[] = {
/* ASIC3 GPIO banks A and B along with some of C and D
implement the buffering for the CF slot. */
ASIC3_CONFIG_GPIO(0, 1, 1, 0),
ASIC3_CONFIG_GPIO(1, 1, 1, 0),
ASIC3_CONFIG_GPIO(2, 1, 1, 0),
ASIC3_CONFIG_GPIO(3, 1, 1, 0),
ASIC3_CONFIG_GPIO(4, 1, 1, 0),
ASIC3_CONFIG_GPIO(5, 1, 1, 0),
ASIC3_CONFIG_GPIO(6, 1, 1, 0),
ASIC3_CONFIG_GPIO(7, 1, 1, 0),
ASIC3_CONFIG_GPIO(8, 1, 1, 0),
ASIC3_CONFIG_GPIO(9, 1, 1, 0),
ASIC3_CONFIG_GPIO(10, 1, 1, 0),
ASIC3_CONFIG_GPIO(11, 1, 1, 0),
ASIC3_CONFIG_GPIO(12, 1, 1, 0),
ASIC3_CONFIG_GPIO(13, 1, 1, 0),
ASIC3_CONFIG_GPIO(14, 1, 1, 0),
ASIC3_CONFIG_GPIO(15, 1, 1, 0),

ASIC3_CONFIG_GPIO(16, 1, 1, 0),
ASIC3_CONFIG_GPIO(17, 1, 1, 0),
ASIC3_CONFIG_GPIO(18, 1, 1, 0),
ASIC3_CONFIG_GPIO(19, 1, 1, 0),
ASIC3_CONFIG_GPIO(20, 1, 1, 0),
ASIC3_CONFIG_GPIO(21, 1, 1, 0),
ASIC3_CONFIG_GPIO(22, 1, 1, 0),
ASIC3_CONFIG_GPIO(23, 1, 1, 0),
ASIC3_CONFIG_GPIO(24, 1, 1, 0),
ASIC3_CONFIG_GPIO(25, 1, 1, 0),
ASIC3_CONFIG_GPIO(26, 1, 1, 0),
ASIC3_CONFIG_GPIO(27, 1, 1, 0),
ASIC3_CONFIG_GPIO(28, 1, 1, 0),
ASIC3_CONFIG_GPIO(29, 1, 1, 0),
ASIC3_CONFIG_GPIO(30, 1, 1, 0),
ASIC3_CONFIG_GPIO(31, 1, 1, 0),

/* GPIOC - CF, LEDs, SD */
ASIC3_CONFIG_GPIO(32,1,1,0), /* GPIOC_LED_RED */
ASIC3_CONFIG_GPIO(33,1,1,0), /* GPIOC_LED_GREEN */
ASIC3_CONFIG_GPIO(34,1,1,0), /* GPIOC_LED_BLUE */
ASIC3_CONFIG_GPIO(35,0,0,0), /* GPIOC_nSD_CS */
ASIC3_CONFIG_GPIO(36,1,0,0), /* GPIOC_CF_nCD */
ASIC3_CONFIG_GPIO(37,1,1,0), /* GPIOC_nCIOW */
ASIC3_CONFIG_GPIO(38,1,1,0), /* GPIOC_nCIOR */
ASIC3_CONFIG_GPIO(39,1,0,0), /* GPIOC_nPCE1 */
ASIC3_CONFIG_GPIO(40,1,0,0), /* GPIOC_nPCE2 */
ASIC3_CONFIG_GPIO(41,1,0,0), /* GPIOC_nPOE */
ASIC3_CONFIG_GPIO(42,1,0,0), /* GPIOC_CF_nPWE */
ASIC3_CONFIG_GPIO(43,1,0,0), /* GPIOC_PSKTSEL */
ASIC3_CONFIG_GPIO(44,1,0,0), /* GPIOC_nPREG */
ASIC3_CONFIG_GPIO(45,1,1,0), /* GPIOC_nPWAIT */
ASIC3_CONFIG_GPIO(46,1,1,0), /* GPIOC_nPIOS16 */
ASIC3_CONFIG_GPIO(47,1,0,0), /* GPIOC_nPIOR */

/* GPIOD: all inputs */
ASIC3_CONFIG_GPIO_DEFAULT(48,0,0), /* GPIOD_CPU_SS_INT */
ASIC3_CONFIG_GPIO_DEFAULT(49,0,0), /* GPIOD_nKEY_AP2 */
ASIC3_CONFIG_GPIO_DEFAULT(50,0,0), /* GPIOD_BLUETOOTH_WAKEUP */
ASIC3_CONFIG_GPIO_DEFAULT(51,0,0), /* GPIOD_nKEY_AP4 */
ASIC3_CONFIG_GPIO_DEFAULT(52,0,0), /* GPIOD_CF_nCD */
ASIC3_CONFIG_GPIO_DEFAULT(53,0,0), /* GPIOD_nPIO */
ASIC3_CONFIG_GPIO_DEFAULT(54,0,0), /* GPIOD_nKEY_RECORD */
ASIC3_CONFIG_GPIO_DEFAULT(55,0,0), /* GPIOD_nSDIO_DETECT */
ASIC3_CONFIG_GPIO_DEFAULT(56,0,0), /* GPIOD_COM_DCD */
ASIC3_CONFIG_GPIO_DEFAULT(57,0,0), /* GPIOD_nAC_IN */
ASIC3_CONFIG_GPIO_DEFAULT(58,0,0), /* GPIOD_nSDIO_IRQ */
ASIC3_CONFIG_GPIO(59,1,0,0), /* GPIOD_nCIOIS16 */
ASIC3_CONFIG_GPIO(60,1,0,0), /* GPIOD_nCWAIT */
ASIC3_CONFIG_GPIO_DEFAULT(61,0,0), /* GPIOD_CF_RNB */
ASIC3_CONFIG_GPIO_DEFAULT(62,0,0), /* GPIOD_nUSBC_DETECT */
ASIC3_CONFIG_GPIO(63,1,0,0), /* GPIOD_ASIC3_nPIOW */
};

Do you think it would make sense to include constants for the
alternate functions like
#define ASIC3_GPIO32_LED0 ASIC3_CONFIG_GPIO(32,1,1,0)
#define ASIC3_GPIO43_PSKTSEL ASIC3_CONFIG_GPIO(43,1,0,0)
etc. in asic3.h?

How does the array look like that you use for Universal?

> + /* Enable all GPIOs */
> asic3_write_register(asic, ASIC3_GPIO_OFFSET(A, Mask), 0xffff);
> asic3_write_register(asic, ASIC3_GPIO_OFFSET(B, Mask), 0xffff);
> asic3_write_register(asic, ASIC3_GPIO_OFFSET(C, Mask), 0xffff);
> asic3_write_register(asic, ASIC3_GPIO_OFFSET(D, Mask), 0xffff);
>
> - asic3_set_gpio_a(asic, SleepMask, 0xffff, 0xffff);
> - asic3_set_gpio_b(asic, SleepMask, 0xffff, 0xffff);
> - asic3_set_gpio_c(asic, SleepMask, 0xffff, 0xffff);
> - asic3_set_gpio_d(asic, SleepMask, 0xffff, 0xffff);
> -
> - if (pdata) {
> - asic3_set_gpio_banks(asic, Out, 0xffff, pdata, init);
> - asic3_set_gpio_banks(asic, Direction, 0xffff, pdata, dir);
> - asic3_set_gpio_banks(asic, SleepMask, 0xffff, pdata,
> - sleep_mask);
> - asic3_set_gpio_banks(asic, SleepOut, 0xffff, pdata, sleep_out);
> - asic3_set_gpio_banks(asic, BattFaultOut, 0xffff, pdata,
> - batt_fault_out);
> - asic3_set_gpio_banks(asic, SleepConf, 0xffff, pdata,
> - sleep_conf);
> - asic3_set_gpio_banks(asic, AltFunction, 0xffff, pdata,
> - alt_function);
> + for (i = 0; i < num; i++) {
> + u8 alt, pin, dir, init, bank_num, bit_num;
> + u16 config = gpio_config[i];
> +
> + pin = ASIC3_CONFIG_GPIO_PIN(config);
> + alt = ASIC3_CONFIG_GPIO_ALT(config);
> + dir = ASIC3_CONFIG_GPIO_DIR(config);
> + init = ASIC3_CONFIG_GPIO_INIT(config);
> +
> + bank_num = ASIC3_GPIO_TO_BANK(pin);
> + bit_num = ASIC3_GPIO_TO_BIT(pin);
> +
> + alt_reg[bank_num] |= (alt << bit_num);
> + out_reg[bank_num] |= (init << bit_num);
> + dir_reg[bank_num] |= (dir << bit_num);
> + }
> +
> + for (i = 0; i < ASIC3_NUM_GPIO_BANKS; i++) {
> + asic3_write_register(asic,
> + ASIC3_BANK_TO_BASE(i) +
> + ASIC3_GPIO_Direction,
> + dir_reg[i]);
> + asic3_write_register(asic,
> + ASIC3_BANK_TO_BASE(i) + ASIC3_GPIO_Out,
> + out_reg[i]);
> + asic3_write_register(asic,
> + ASIC3_BANK_TO_BASE(i) +
> + ASIC3_GPIO_AltFunction,
> + alt_reg[i]);
> }
>
> return gpiochip_add(&asic->gpio);
> @@ -598,7 +583,9 @@ static int asic3_probe(struct platform_d
> asic->gpio.direction_input = asic3_gpio_direction_input;
> asic->gpio.direction_output = asic3_gpio_direction_output;
>
> - ret = asic3_gpio_probe(pdev);
> + ret = asic3_gpio_probe(pdev,
> + pdata->gpio_config,
> + pdata->gpio_config_num);
> if (ret < 0) {
> printk(KERN_ERR "GPIO probe failed\n");
> goto out_irq;
> Index: linux-2.6-htc-asic3/include/linux/mfd/asic3.h
> ===================================================================
> --- linux-2.6-htc-asic3.orig/include/linux/mfd/asic3.h 2008-05-11 17:47:15.000000000 +0200
> +++ linux-2.6-htc-asic3/include/linux/mfd/asic3.h 2008-05-11 18:12:07.000000000 +0200
> @@ -8,7 +8,7 @@
> * published by the Free Software Foundation.
> *
> * Copyright 2001 Compaq Computer Corporation.
> - * Copyright 2007 OpendHand.
> + * Copyright 2007-2008 OpenedHand Ltd.
> */
>
> #ifndef __ASIC3_H__
> @@ -17,15 +17,8 @@
> #include <linux/types.h>
>
> struct asic3_platform_data {
> - struct {
> - u32 dir;
> - u32 init;
> - u32 sleep_mask;
> - u32 sleep_out;
> - u32 batt_fault_out;
> - u32 sleep_conf;
> - u32 alt_function;
> - } gpio_a, gpio_b, gpio_c, gpio_d;
> + u16 *gpio_config;
> + unsigned int gpio_config_num;
>
> unsigned int bus_shift;
>
> @@ -86,6 +79,27 @@ struct asic3_platform_data {
> */
> #define ASIC3_GPIO_Status 0x30 /* R Pin status */
>
> +/*
> + * ASIC3 GPIO config
> + *
> + * Bits 0..6 gpio number
> + * Bits 7..13 Alternate function
> + * Bit 14 Direction
> + * Bit 15 Initial value
> + *
> + */
> +#define ASIC3_CONFIG_GPIO_PIN(config) ((config) & 0x7f)
> +#define ASIC3_CONFIG_GPIO_ALT(config) (((config) & (0x7f << 7)) >> 7)
> +#define ASIC3_CONFIG_GPIO_DIR(config) ((config & (1 << 14)) >> 14)
> +#define ASIC3_CONFIG_GPIO_INIT(config) ((config & (1 << 15)) >> 15)
> +#define ASIC3_CONFIG_GPIO(gpio, alt, dir, init) (((gpio) & 0x7f) \
> + | (((alt) & 0x7f) << 7) | (((dir) & 0x1) << 14) \
> + | (((init) & 0x1) << 15))
> +#define ASIC3_CONFIG_GPIO_DEFAULT(gpio, dir, init) \
> + ASIC3_CONFIG_GPIO((gpio), 0, (dir), (init))
> +#define ASIC3_CONFIG_GPIO_DEFAULT_OUT(gpio, init) \
> + ASIC3_CONFIG_GPIO((gpio), 0, 1, (init))
> +
> #define ASIC3_SPI_Base 0x0400
> #define ASIC3_SPI_Control 0x0000
> #define ASIC3_SPI_TxData 0x0004
>
> --
> --
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regards
Philipp
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