d965263d2a
Add support for the PXA25X SoC family, the oldest of the PXA serie. Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
192 lines
4 KiB
C
192 lines
4 KiB
C
/*
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* linux/arch/arm/mach-pxa/mfp-pxa2xx.c
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*
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* PXA2xx pin mux configuration support
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*
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* The GPIOs on PXA2xx can be configured as one of many alternate
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* functions, this is by concept samilar to the MFP configuration
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* on PXA3xx, what's more important, the low power pin state and
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* wakeup detection are also supported by the same framework.
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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 <common.h>
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#include <errno.h>
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#include <init.h>
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#include <mach/gpio.h>
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#include <mach/hardware.h>
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#include <mach/mfp-pxa2xx.h>
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#include <mach/pxa-regs.h>
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#define PGSR(x) __REG2(0x40F00020, (x) << 2)
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#define __GAFR(u, x) __REG2((u) ? 0x40E00058 : 0x40E00054, (x) << 3)
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#define GAFR_L(x) __GAFR(0, x)
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#define GAFR_U(x) __GAFR(1, x)
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struct gpio_desc {
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unsigned valid:1;
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unsigned dir_inverted:1;
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unsigned long config;
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};
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static struct gpio_desc gpio_desc[MFP_PIN_GPIO127 + 1];
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static unsigned long gpdr_lpm[4];
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static int __mfp_config_gpio(unsigned gpio, unsigned long c)
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{
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unsigned long gafr, mask = GPIO_bit(gpio);
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int bank = gpio_to_bank(gpio);
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int uorl = !!(gpio & 0x10); /* GAFRx_U or GAFRx_L ? */
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int shft = (gpio & 0xf) << 1;
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int fn = MFP_AF(c);
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int is_out = (c & MFP_DIR_OUT) ? 1 : 0;
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if (fn > 3)
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return -EINVAL;
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/* alternate function and direction at run-time */
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gafr = (uorl == 0) ? GAFR_L(bank) : GAFR_U(bank);
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gafr = (gafr & ~(0x3 << shft)) | (fn << shft);
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if (uorl == 0)
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GAFR_L(bank) = gafr;
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else
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GAFR_U(bank) = gafr;
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if (is_out ^ gpio_desc[gpio].dir_inverted)
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GPDR(gpio) |= mask;
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else
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GPDR(gpio) &= ~mask;
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/* alternate function and direction at low power mode */
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switch (c & MFP_LPM_STATE_MASK) {
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case MFP_LPM_DRIVE_HIGH:
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PGSR(bank) |= mask;
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is_out = 1;
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break;
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case MFP_LPM_DRIVE_LOW:
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PGSR(bank) &= ~mask;
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is_out = 1;
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break;
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case MFP_LPM_DEFAULT:
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break;
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default:
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/* warning and fall through, treat as MFP_LPM_DEFAULT */
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pr_warning("%s: GPIO%d: unsupported low power mode\n",
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__func__, gpio);
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break;
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}
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if (is_out ^ gpio_desc[gpio].dir_inverted)
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gpdr_lpm[bank] |= mask;
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else
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gpdr_lpm[bank] &= ~mask;
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return 0;
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}
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static inline int __mfp_validate(int mfp)
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{
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int gpio = mfp_to_gpio(mfp);
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if ((mfp > MFP_PIN_GPIO127) || !gpio_desc[gpio].valid) {
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pr_warning("%s: GPIO%d is invalid pin\n", __func__, gpio);
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return -1;
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}
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return gpio;
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}
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void pxa2xx_mfp_config(unsigned long *mfp_cfgs, int num)
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{
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unsigned long *c;
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int i, gpio;
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for (i = 0, c = mfp_cfgs; i < num; i++, c++) {
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gpio = __mfp_validate(MFP_PIN(*c));
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if (gpio < 0)
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continue;
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gpio_desc[gpio].config = *c;
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__mfp_config_gpio(gpio, *c);
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}
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}
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void pxa2xx_mfp_set_lpm(int mfp, unsigned long lpm)
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{
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unsigned long c;
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int gpio;
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gpio = __mfp_validate(mfp);
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if (gpio < 0)
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return;
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c = gpio_desc[gpio].config;
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c = (c & ~MFP_LPM_STATE_MASK) | lpm;
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__mfp_config_gpio(gpio, c);
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}
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static void __init pxa25x_mfp_init(void)
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{
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int i;
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for (i = 0; i <= pxa_last_gpio; i++)
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gpio_desc[i].valid = 1;
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/* PXA26x has additional 4 GPIOs (86/87/88/89) which has the
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* direction bit inverted in GPDR2. See PXA26x DM 4.1.1.
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*/
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for (i = 86; i <= pxa_last_gpio; i++)
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gpio_desc[i].dir_inverted = 1;
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}
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static void __init pxa27x_mfp_init(void)
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{
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int i;
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for (i = 0; i <= pxa_last_gpio; i++) {
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/*
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* skip GPIO2, 5, 6, 7, 8, they are not
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* valid pins allow configuration
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*/
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if (i == 2 || i == 5 || i == 6 || i == 7 || i == 8)
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continue;
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gpio_desc[i].valid = 1;
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}
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}
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static int __init pxa2xx_mfp_init(void)
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{
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int i;
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if (!cpu_is_pxa2xx())
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return 0;
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if (cpu_is_pxa25x()) {
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pxa_init_gpio(0, 84);
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pxa25x_mfp_init();
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}
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if (cpu_is_pxa27x()) {
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pxa_init_gpio(2, 120);
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pxa27x_mfp_init();
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}
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/* clear RDH bit to enable GPIO receivers after reset/sleep exit */
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PSSR = PSSR_RDH;
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/* initialize gafr_run[], pgsr_lpm[] from existing values */
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for (i = 0; i <= gpio_to_bank(pxa_last_gpio); i++)
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gpdr_lpm[i] = GPDR(i * 32);
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return 0;
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}
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postcore_initcall(pxa2xx_mfp_init);
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