1184 строки
24 KiB
C
1184 строки
24 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* IO interface mux allocator for ETRAX100LX.
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* Copyright 2004-2007, Axis Communications AB
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*/
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/* C.f. ETRAX100LX Designer's Reference chapter 19.9 */
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/errno.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <arch/svinto.h>
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#include <asm/io.h>
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#include <arch/io_interface_mux.h>
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#include <arch/system.h>
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#define DBG(s)
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/* Macro to access ETRAX 100 registers */
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#define SETS(var, reg, field, val) var = (var & ~IO_MASK_(reg##_, field##_)) | \
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IO_STATE_(reg##_, field##_, _##val)
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enum io_if_group {
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group_a = (1<<0),
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group_b = (1<<1),
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group_c = (1<<2),
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group_d = (1<<3),
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group_e = (1<<4),
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group_f = (1<<5)
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};
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struct watcher
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{
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void (*notify)(const unsigned int gpio_in_available,
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const unsigned int gpio_out_available,
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const unsigned char pa_available,
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const unsigned char pb_available);
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struct watcher *next;
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};
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struct if_group
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{
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enum io_if_group group;
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/* name - the name of the group 'A' to 'F' */
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char *name;
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/* used - a bit mask of all pins in the group in the order listed
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* in the tables in 19.9.1 to 19.9.6. Note that no
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* distinction is made between in, out and in/out pins. */
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unsigned int used;
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};
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struct interface
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{
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enum cris_io_interface ioif;
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/* name - the name of the interface */
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char *name;
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/* groups - OR'ed together io_if_group flags describing what pin groups
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* the interface uses pins in. */
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unsigned char groups;
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/* used - set when the interface is allocated. */
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unsigned char used;
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char *owner;
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/* group_a through group_f - bit masks describing what pins in the
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* pin groups the interface uses. */
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unsigned int group_a;
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unsigned int group_b;
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unsigned int group_c;
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unsigned int group_d;
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unsigned int group_e;
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unsigned int group_f;
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/* gpio_g_in, gpio_g_out, gpio_b - bit masks telling what pins in the
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* GPIO ports the interface uses. This could be reconstucted using
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* the group_X masks and a table of what pins the GPIO ports use,
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* but that would be messy. */
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unsigned int gpio_g_in;
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unsigned int gpio_g_out;
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unsigned char gpio_b;
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};
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static struct if_group if_groups[6] = {
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{
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.group = group_a,
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.name = "A",
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.used = 0,
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},
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{
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.group = group_b,
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.name = "B",
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.used = 0,
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},
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{
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.group = group_c,
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.name = "C",
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.used = 0,
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},
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{
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.group = group_d,
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.name = "D",
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.used = 0,
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},
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{
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.group = group_e,
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.name = "E",
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.used = 0,
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},
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{
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.group = group_f,
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.name = "F",
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.used = 0,
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}
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};
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/* The order in the array must match the order of enum
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* cris_io_interface in io_interface_mux.h */
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static struct interface interfaces[] = {
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/* Begin Non-multiplexed interfaces */
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{
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.ioif = if_eth,
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.name = "ethernet",
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.groups = 0,
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.group_a = 0,
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.group_b = 0,
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.group_c = 0,
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.group_d = 0,
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.group_e = 0,
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.group_f = 0,
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.gpio_g_in = 0,
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.gpio_g_out = 0,
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.gpio_b = 0
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},
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{
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.ioif = if_serial_0,
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.name = "serial_0",
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.groups = 0,
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.group_a = 0,
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.group_b = 0,
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.group_c = 0,
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.group_d = 0,
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.group_e = 0,
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.group_f = 0,
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.gpio_g_in = 0,
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.gpio_g_out = 0,
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.gpio_b = 0
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},
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/* End Non-multiplexed interfaces */
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{
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.ioif = if_serial_1,
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.name = "serial_1",
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.groups = group_e,
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.group_a = 0,
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.group_b = 0,
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.group_c = 0,
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.group_d = 0,
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.group_e = 0x0f,
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.group_f = 0,
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.gpio_g_in = 0x00000000,
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.gpio_g_out = 0x00000000,
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.gpio_b = 0x00
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},
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{
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.ioif = if_serial_2,
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.name = "serial_2",
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.groups = group_b,
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.group_a = 0,
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.group_b = 0x0f,
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.group_c = 0,
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.group_d = 0,
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.group_e = 0,
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.group_f = 0,
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.gpio_g_in = 0x000000c0,
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.gpio_g_out = 0x000000c0,
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.gpio_b = 0x00
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},
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{
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.ioif = if_serial_3,
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.name = "serial_3",
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.groups = group_c,
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.group_a = 0,
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.group_b = 0,
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.group_c = 0x0f,
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.group_d = 0,
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.group_e = 0,
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.group_f = 0,
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.gpio_g_in = 0xc0000000,
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.gpio_g_out = 0xc0000000,
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.gpio_b = 0x00
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},
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{
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.ioif = if_sync_serial_1,
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.name = "sync_serial_1",
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.groups = group_e | group_f,
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.group_a = 0,
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.group_b = 0,
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.group_c = 0,
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.group_d = 0,
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.group_e = 0x0f,
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.group_f = 0x10,
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.gpio_g_in = 0x00000000,
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.gpio_g_out = 0x00000000,
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.gpio_b = 0x10
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},
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{
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.ioif = if_sync_serial_3,
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.name = "sync_serial_3",
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.groups = group_c | group_f,
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.group_a = 0,
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.group_b = 0,
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.group_c = 0x0f,
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.group_d = 0,
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.group_e = 0,
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.group_f = 0x80,
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.gpio_g_in = 0xc0000000,
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.gpio_g_out = 0xc0000000,
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.gpio_b = 0x80
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},
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{
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.ioif = if_shared_ram,
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.name = "shared_ram",
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.groups = group_a,
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.group_a = 0x7f8ff,
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.group_b = 0,
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.group_c = 0,
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.group_d = 0,
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.group_e = 0,
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.group_f = 0,
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.gpio_g_in = 0x0000ff3e,
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.gpio_g_out = 0x0000ff38,
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.gpio_b = 0x00
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},
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{
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.ioif = if_shared_ram_w,
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.name = "shared_ram_w",
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.groups = group_a | group_d,
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.group_a = 0x7f8ff,
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.group_b = 0,
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.group_c = 0,
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.group_d = 0xff,
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.group_e = 0,
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.group_f = 0,
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.gpio_g_in = 0x00ffff3e,
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.gpio_g_out = 0x00ffff38,
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.gpio_b = 0x00
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},
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{
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.ioif = if_par_0,
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.name = "par_0",
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.groups = group_a,
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.group_a = 0x7fbff,
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.group_b = 0,
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.group_c = 0,
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.group_d = 0,
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.group_e = 0,
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.group_f = 0,
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.gpio_g_in = 0x0000ff3e,
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.gpio_g_out = 0x0000ff3e,
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.gpio_b = 0x00
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},
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{
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.ioif = if_par_1,
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.name = "par_1",
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.groups = group_d,
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.group_a = 0,
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.group_b = 0,
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.group_c = 0,
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.group_d = 0x7feff,
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.group_e = 0,
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.group_f = 0,
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.gpio_g_in = 0x3eff0000,
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.gpio_g_out = 0x3eff0000,
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.gpio_b = 0x00
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},
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{
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.ioif = if_par_w,
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.name = "par_w",
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.groups = group_a | group_d,
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.group_a = 0x7fbff,
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.group_b = 0,
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.group_c = 0,
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.group_d = 0xff,
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.group_e = 0,
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.group_f = 0,
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.gpio_g_in = 0x00ffff3e,
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.gpio_g_out = 0x00ffff3e,
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.gpio_b = 0x00
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},
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{
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.ioif = if_scsi8_0,
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.name = "scsi8_0",
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.groups = group_a | group_b | group_f,
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.group_a = 0x7ffff,
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.group_b = 0x0f,
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.group_c = 0,
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.group_d = 0,
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.group_e = 0,
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.group_f = 0x10,
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.gpio_g_in = 0x0000ffff,
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.gpio_g_out = 0x0000ffff,
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.gpio_b = 0x10
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},
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{
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.ioif = if_scsi8_1,
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.name = "scsi8_1",
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.groups = group_c | group_d | group_f,
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.group_a = 0,
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.group_b = 0,
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.group_c = 0x0f,
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.group_d = 0x7ffff,
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.group_e = 0,
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.group_f = 0x80,
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.gpio_g_in = 0xffff0000,
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.gpio_g_out = 0xffff0000,
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.gpio_b = 0x80
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},
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{
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.ioif = if_scsi_w,
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.name = "scsi_w",
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.groups = group_a | group_b | group_d | group_f,
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.group_a = 0x7ffff,
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.group_b = 0x0f,
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.group_c = 0,
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.group_d = 0x601ff,
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.group_e = 0,
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.group_f = 0x90,
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.gpio_g_in = 0x01ffffff,
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.gpio_g_out = 0x07ffffff,
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.gpio_b = 0x80
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},
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{
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.ioif = if_ata,
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.name = "ata",
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.groups = group_a | group_b | group_c | group_d,
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.group_a = 0x7ffff,
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.group_b = 0x0f,
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.group_c = 0x0f,
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.group_d = 0x7cfff,
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.group_e = 0,
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.group_f = 0,
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.gpio_g_in = 0xf9ffffff,
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.gpio_g_out = 0xffffffff,
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.gpio_b = 0x80
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},
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{
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.ioif = if_csp,
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.name = "csp",
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.groups = group_f,
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.group_a = 0,
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.group_b = 0,
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.group_c = 0,
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.group_d = 0,
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.group_e = 0,
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.group_f = 0xfc,
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.gpio_g_in = 0x00000000,
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.gpio_g_out = 0x00000000,
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.gpio_b = 0xfc
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},
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{
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.ioif = if_i2c,
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.name = "i2c",
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.groups = group_f,
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.group_a = 0,
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.group_b = 0,
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.group_c = 0,
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.group_d = 0,
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.group_e = 0,
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.group_f = 0x03,
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.gpio_g_in = 0x00000000,
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.gpio_g_out = 0x00000000,
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.gpio_b = 0x03
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},
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{
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.ioif = if_usb_1,
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.name = "usb_1",
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.groups = group_e | group_f,
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.group_a = 0,
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.group_b = 0,
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.group_c = 0,
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.group_d = 0,
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.group_e = 0x0f,
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.group_f = 0x2c,
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.gpio_g_in = 0x00000000,
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.gpio_g_out = 0x00000000,
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.gpio_b = 0x2c
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},
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{
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.ioif = if_usb_2,
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.name = "usb_2",
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.groups = group_d,
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.group_a = 0,
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.group_b = 0,
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.group_c = 0,
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.group_d = 0,
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.group_e = 0x33e00,
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.group_f = 0,
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.gpio_g_in = 0x3e000000,
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.gpio_g_out = 0x0c000000,
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.gpio_b = 0x00
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},
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/* GPIO pins */
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{
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.ioif = if_gpio_grp_a,
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.name = "gpio_a",
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.groups = group_a,
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.group_a = 0,
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.group_b = 0,
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.group_c = 0,
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.group_d = 0,
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.group_e = 0,
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.group_f = 0,
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.gpio_g_in = 0x0000ff3f,
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.gpio_g_out = 0x0000ff3f,
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.gpio_b = 0x00
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},
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{
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.ioif = if_gpio_grp_b,
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.name = "gpio_b",
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.groups = group_b,
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.group_a = 0,
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.group_b = 0,
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.group_c = 0,
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.group_d = 0,
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.group_e = 0,
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.group_f = 0,
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.gpio_g_in = 0x000000c0,
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.gpio_g_out = 0x000000c0,
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.gpio_b = 0x00
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},
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{
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.ioif = if_gpio_grp_c,
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.name = "gpio_c",
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.groups = group_c,
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.group_a = 0,
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.group_b = 0,
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.group_c = 0,
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.group_d = 0,
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.group_e = 0,
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.group_f = 0,
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.gpio_g_in = 0xc0000000,
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.gpio_g_out = 0xc0000000,
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.gpio_b = 0x00
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},
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{
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.ioif = if_gpio_grp_d,
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.name = "gpio_d",
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.groups = group_d,
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.group_a = 0,
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.group_b = 0,
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.group_c = 0,
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.group_d = 0,
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.group_e = 0,
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.group_f = 0,
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.gpio_g_in = 0x3fff0000,
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.gpio_g_out = 0x3fff0000,
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.gpio_b = 0x00
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},
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{
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.ioif = if_gpio_grp_e,
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.name = "gpio_e",
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.groups = group_e,
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.group_a = 0,
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.group_b = 0,
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.group_c = 0,
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.group_d = 0,
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.group_e = 0,
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.group_f = 0,
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.gpio_g_in = 0x00000000,
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.gpio_g_out = 0x00000000,
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.gpio_b = 0x00
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},
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{
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.ioif = if_gpio_grp_f,
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.name = "gpio_f",
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.groups = group_f,
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.group_a = 0,
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.group_b = 0,
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.group_c = 0,
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.group_d = 0,
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.group_e = 0,
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.group_f = 0,
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.gpio_g_in = 0x00000000,
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.gpio_g_out = 0x00000000,
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.gpio_b = 0xff
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}
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/* Array end */
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};
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static struct watcher *watchers = NULL;
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/* The pins that are free to use in the GPIO ports. */
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static unsigned int gpio_in_pins = 0xffffffff;
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static unsigned int gpio_out_pins = 0xffffffff;
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static unsigned char gpio_pb_pins = 0xff;
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static unsigned char gpio_pa_pins = 0xff;
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/* Identifiers for the owners of the GPIO pins. */
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static enum cris_io_interface gpio_pa_owners[8];
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static enum cris_io_interface gpio_pb_owners[8];
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static enum cris_io_interface gpio_pg_owners[32];
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static int cris_io_interface_init(void);
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static unsigned char clear_group_from_set(const unsigned char groups, struct if_group *group)
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{
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return (groups & ~group->group);
|
|
}
|
|
|
|
|
|
static struct if_group *get_group(const unsigned char groups)
|
|
{
|
|
int i;
|
|
for (i = 0; i < ARRAY_SIZE(if_groups); i++) {
|
|
if (groups & if_groups[i].group) {
|
|
return &if_groups[i];
|
|
}
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
|
|
static void notify_watchers(void)
|
|
{
|
|
struct watcher *w = watchers;
|
|
|
|
DBG(printk("io_interface_mux: notifying watchers\n"));
|
|
|
|
while (NULL != w) {
|
|
w->notify((const unsigned int)gpio_in_pins,
|
|
(const unsigned int)gpio_out_pins,
|
|
(const unsigned char)gpio_pa_pins,
|
|
(const unsigned char)gpio_pb_pins);
|
|
w = w->next;
|
|
}
|
|
}
|
|
|
|
|
|
int cris_request_io_interface(enum cris_io_interface ioif, const char *device_id)
|
|
{
|
|
int set_gen_config = 0;
|
|
int set_gen_config_ii = 0;
|
|
unsigned long int gens;
|
|
unsigned long int gens_ii;
|
|
struct if_group *grp;
|
|
unsigned char group_set;
|
|
unsigned long flags;
|
|
int res = 0;
|
|
|
|
(void)cris_io_interface_init();
|
|
|
|
DBG(printk("cris_request_io_interface(%d, \"%s\")\n", ioif, device_id));
|
|
|
|
if ((ioif >= if_max_interfaces) || (ioif < 0)) {
|
|
printk(KERN_CRIT "cris_request_io_interface: Bad interface "
|
|
"%u submitted for %s\n",
|
|
ioif,
|
|
device_id);
|
|
return -EINVAL;
|
|
}
|
|
|
|
local_irq_save(flags);
|
|
|
|
if (interfaces[ioif].used) {
|
|
printk(KERN_CRIT "cris_io_interface: Cannot allocate interface "
|
|
"%s for %s, in use by %s\n",
|
|
interfaces[ioif].name,
|
|
device_id,
|
|
interfaces[ioif].owner);
|
|
res = -EBUSY;
|
|
goto exit;
|
|
}
|
|
|
|
/* Check that all required pins in the used groups are free
|
|
* before allocating. */
|
|
group_set = interfaces[ioif].groups;
|
|
while (NULL != (grp = get_group(group_set))) {
|
|
unsigned int if_group_use = 0;
|
|
|
|
switch (grp->group) {
|
|
case group_a:
|
|
if_group_use = interfaces[ioif].group_a;
|
|
break;
|
|
case group_b:
|
|
if_group_use = interfaces[ioif].group_b;
|
|
break;
|
|
case group_c:
|
|
if_group_use = interfaces[ioif].group_c;
|
|
break;
|
|
case group_d:
|
|
if_group_use = interfaces[ioif].group_d;
|
|
break;
|
|
case group_e:
|
|
if_group_use = interfaces[ioif].group_e;
|
|
break;
|
|
case group_f:
|
|
if_group_use = interfaces[ioif].group_f;
|
|
break;
|
|
default:
|
|
BUG_ON(1);
|
|
}
|
|
|
|
if (if_group_use & grp->used) {
|
|
printk(KERN_INFO "cris_request_io_interface: group "
|
|
"%s needed by %s not available\n",
|
|
grp->name, interfaces[ioif].name);
|
|
res = -EBUSY;
|
|
goto exit;
|
|
}
|
|
|
|
group_set = clear_group_from_set(group_set, grp);
|
|
}
|
|
|
|
/* Are the required GPIO pins available too? */
|
|
if (((interfaces[ioif].gpio_g_in & gpio_in_pins) !=
|
|
interfaces[ioif].gpio_g_in) ||
|
|
((interfaces[ioif].gpio_g_out & gpio_out_pins) !=
|
|
interfaces[ioif].gpio_g_out) ||
|
|
((interfaces[ioif].gpio_b & gpio_pb_pins) !=
|
|
interfaces[ioif].gpio_b)) {
|
|
printk(KERN_CRIT "cris_request_io_interface: Could not get "
|
|
"required pins for interface %u\n", ioif);
|
|
res = -EBUSY;
|
|
goto exit;
|
|
}
|
|
|
|
/* Check which registers need to be reconfigured. */
|
|
gens = genconfig_shadow;
|
|
gens_ii = gen_config_ii_shadow;
|
|
|
|
set_gen_config = 1;
|
|
switch (ioif)
|
|
{
|
|
/* Begin Non-multiplexed interfaces */
|
|
case if_eth:
|
|
/* fall through */
|
|
case if_serial_0:
|
|
set_gen_config = 0;
|
|
break;
|
|
/* End Non-multiplexed interfaces */
|
|
case if_serial_1:
|
|
set_gen_config_ii = 1;
|
|
SETS(gens_ii, R_GEN_CONFIG_II, sermode1, async);
|
|
break;
|
|
case if_serial_2:
|
|
SETS(gens, R_GEN_CONFIG, ser2, select);
|
|
break;
|
|
case if_serial_3:
|
|
SETS(gens, R_GEN_CONFIG, ser3, select);
|
|
set_gen_config_ii = 1;
|
|
SETS(gens_ii, R_GEN_CONFIG_II, sermode3, async);
|
|
break;
|
|
case if_sync_serial_1:
|
|
set_gen_config_ii = 1;
|
|
SETS(gens_ii, R_GEN_CONFIG_II, sermode1, sync);
|
|
break;
|
|
case if_sync_serial_3:
|
|
SETS(gens, R_GEN_CONFIG, ser3, select);
|
|
set_gen_config_ii = 1;
|
|
SETS(gens_ii, R_GEN_CONFIG_II, sermode3, sync);
|
|
break;
|
|
case if_shared_ram:
|
|
SETS(gens, R_GEN_CONFIG, mio, select);
|
|
break;
|
|
case if_shared_ram_w:
|
|
SETS(gens, R_GEN_CONFIG, mio_w, select);
|
|
break;
|
|
case if_par_0:
|
|
SETS(gens, R_GEN_CONFIG, par0, select);
|
|
break;
|
|
case if_par_1:
|
|
SETS(gens, R_GEN_CONFIG, par1, select);
|
|
break;
|
|
case if_par_w:
|
|
SETS(gens, R_GEN_CONFIG, par0, select);
|
|
SETS(gens, R_GEN_CONFIG, par_w, select);
|
|
break;
|
|
case if_scsi8_0:
|
|
SETS(gens, R_GEN_CONFIG, scsi0, select);
|
|
break;
|
|
case if_scsi8_1:
|
|
SETS(gens, R_GEN_CONFIG, scsi1, select);
|
|
break;
|
|
case if_scsi_w:
|
|
SETS(gens, R_GEN_CONFIG, scsi0, select);
|
|
SETS(gens, R_GEN_CONFIG, scsi0w, select);
|
|
break;
|
|
case if_ata:
|
|
SETS(gens, R_GEN_CONFIG, ata, select);
|
|
break;
|
|
case if_csp:
|
|
/* fall through */
|
|
case if_i2c:
|
|
set_gen_config = 0;
|
|
break;
|
|
case if_usb_1:
|
|
SETS(gens, R_GEN_CONFIG, usb1, select);
|
|
break;
|
|
case if_usb_2:
|
|
SETS(gens, R_GEN_CONFIG, usb2, select);
|
|
break;
|
|
case if_gpio_grp_a:
|
|
/* GPIO groups are only accounted, don't do configuration changes. */
|
|
/* fall through */
|
|
case if_gpio_grp_b:
|
|
/* fall through */
|
|
case if_gpio_grp_c:
|
|
/* fall through */
|
|
case if_gpio_grp_d:
|
|
/* fall through */
|
|
case if_gpio_grp_e:
|
|
/* fall through */
|
|
case if_gpio_grp_f:
|
|
set_gen_config = 0;
|
|
break;
|
|
default:
|
|
printk(KERN_INFO "cris_request_io_interface: Bad interface "
|
|
"%u submitted for %s\n",
|
|
ioif, device_id);
|
|
res = -EBUSY;
|
|
goto exit;
|
|
}
|
|
|
|
/* All needed I/O pins and pin groups are free, allocate. */
|
|
group_set = interfaces[ioif].groups;
|
|
while (NULL != (grp = get_group(group_set))) {
|
|
unsigned int if_group_use = 0;
|
|
|
|
switch (grp->group) {
|
|
case group_a:
|
|
if_group_use = interfaces[ioif].group_a;
|
|
break;
|
|
case group_b:
|
|
if_group_use = interfaces[ioif].group_b;
|
|
break;
|
|
case group_c:
|
|
if_group_use = interfaces[ioif].group_c;
|
|
break;
|
|
case group_d:
|
|
if_group_use = interfaces[ioif].group_d;
|
|
break;
|
|
case group_e:
|
|
if_group_use = interfaces[ioif].group_e;
|
|
break;
|
|
case group_f:
|
|
if_group_use = interfaces[ioif].group_f;
|
|
break;
|
|
default:
|
|
BUG_ON(1);
|
|
}
|
|
grp->used |= if_group_use;
|
|
|
|
group_set = clear_group_from_set(group_set, grp);
|
|
}
|
|
|
|
interfaces[ioif].used = 1;
|
|
interfaces[ioif].owner = (char*)device_id;
|
|
|
|
if (set_gen_config) {
|
|
volatile int i;
|
|
genconfig_shadow = gens;
|
|
*R_GEN_CONFIG = genconfig_shadow;
|
|
/* Wait 12 cycles before doing any DMA command */
|
|
for(i = 6; i > 0; i--)
|
|
nop();
|
|
}
|
|
if (set_gen_config_ii) {
|
|
gen_config_ii_shadow = gens_ii;
|
|
*R_GEN_CONFIG_II = gen_config_ii_shadow;
|
|
}
|
|
|
|
DBG(printk(KERN_DEBUG "GPIO pins: available before: "
|
|
"g_in=0x%08x g_out=0x%08x pb=0x%02x\n",
|
|
gpio_in_pins, gpio_out_pins, gpio_pb_pins));
|
|
DBG(printk(KERN_DEBUG
|
|
"grabbing pins: g_in=0x%08x g_out=0x%08x pb=0x%02x\n",
|
|
interfaces[ioif].gpio_g_in,
|
|
interfaces[ioif].gpio_g_out,
|
|
interfaces[ioif].gpio_b));
|
|
|
|
gpio_in_pins &= ~interfaces[ioif].gpio_g_in;
|
|
gpio_out_pins &= ~interfaces[ioif].gpio_g_out;
|
|
gpio_pb_pins &= ~interfaces[ioif].gpio_b;
|
|
|
|
DBG(printk(KERN_DEBUG "GPIO pins: available after: "
|
|
"g_in=0x%08x g_out=0x%08x pb=0x%02x\n",
|
|
gpio_in_pins, gpio_out_pins, gpio_pb_pins));
|
|
|
|
exit:
|
|
local_irq_restore(flags);
|
|
if (res == 0)
|
|
notify_watchers();
|
|
return res;
|
|
}
|
|
|
|
|
|
void cris_free_io_interface(enum cris_io_interface ioif)
|
|
{
|
|
struct if_group *grp;
|
|
unsigned char group_set;
|
|
unsigned long flags;
|
|
|
|
(void)cris_io_interface_init();
|
|
|
|
if ((ioif >= if_max_interfaces) || (ioif < 0)) {
|
|
printk(KERN_CRIT "cris_free_io_interface: Bad interface %u\n",
|
|
ioif);
|
|
return;
|
|
}
|
|
local_irq_save(flags);
|
|
if (!interfaces[ioif].used) {
|
|
printk(KERN_CRIT "cris_free_io_interface: Freeing free interface %u\n",
|
|
ioif);
|
|
local_irq_restore(flags);
|
|
return;
|
|
}
|
|
group_set = interfaces[ioif].groups;
|
|
while (NULL != (grp = get_group(group_set))) {
|
|
unsigned int if_group_use = 0;
|
|
|
|
switch (grp->group) {
|
|
case group_a:
|
|
if_group_use = interfaces[ioif].group_a;
|
|
break;
|
|
case group_b:
|
|
if_group_use = interfaces[ioif].group_b;
|
|
break;
|
|
case group_c:
|
|
if_group_use = interfaces[ioif].group_c;
|
|
break;
|
|
case group_d:
|
|
if_group_use = interfaces[ioif].group_d;
|
|
break;
|
|
case group_e:
|
|
if_group_use = interfaces[ioif].group_e;
|
|
break;
|
|
case group_f:
|
|
if_group_use = interfaces[ioif].group_f;
|
|
break;
|
|
default:
|
|
BUG_ON(1);
|
|
}
|
|
|
|
if ((grp->used & if_group_use) != if_group_use)
|
|
BUG_ON(1);
|
|
grp->used = grp->used & ~if_group_use;
|
|
|
|
group_set = clear_group_from_set(group_set, grp);
|
|
}
|
|
interfaces[ioif].used = 0;
|
|
interfaces[ioif].owner = NULL;
|
|
|
|
DBG(printk("GPIO pins: available before: g_in=0x%08x g_out=0x%08x pb=0x%02x\n",
|
|
gpio_in_pins, gpio_out_pins, gpio_pb_pins));
|
|
DBG(printk("freeing pins: g_in=0x%08x g_out=0x%08x pb=0x%02x\n",
|
|
interfaces[ioif].gpio_g_in,
|
|
interfaces[ioif].gpio_g_out,
|
|
interfaces[ioif].gpio_b));
|
|
|
|
gpio_in_pins |= interfaces[ioif].gpio_g_in;
|
|
gpio_out_pins |= interfaces[ioif].gpio_g_out;
|
|
gpio_pb_pins |= interfaces[ioif].gpio_b;
|
|
|
|
DBG(printk("GPIO pins: available after: g_in=0x%08x g_out=0x%08x pb=0x%02x\n",
|
|
gpio_in_pins, gpio_out_pins, gpio_pb_pins));
|
|
|
|
local_irq_restore(flags);
|
|
|
|
notify_watchers();
|
|
}
|
|
|
|
/* Create a bitmask from bit 0 (inclusive) to bit stop_bit
|
|
(non-inclusive). stop_bit == 0 returns 0x0 */
|
|
static inline unsigned int create_mask(const unsigned stop_bit)
|
|
{
|
|
/* Avoid overflow */
|
|
if (stop_bit >= 32) {
|
|
return 0xffffffff;
|
|
}
|
|
return (1<<stop_bit)-1;
|
|
}
|
|
|
|
|
|
/* port can be 'a', 'b' or 'g' */
|
|
int cris_io_interface_allocate_pins(const enum cris_io_interface ioif,
|
|
const char port,
|
|
const unsigned start_bit,
|
|
const unsigned stop_bit)
|
|
{
|
|
unsigned int i;
|
|
unsigned int mask = 0;
|
|
unsigned int tmp_mask;
|
|
unsigned long int flags;
|
|
enum cris_io_interface *owners;
|
|
|
|
(void)cris_io_interface_init();
|
|
|
|
DBG(printk("cris_io_interface_allocate_pins: if=%d port=%c start=%u stop=%u\n",
|
|
ioif, port, start_bit, stop_bit));
|
|
|
|
if (!((start_bit <= stop_bit) &&
|
|
((((port == 'a') || (port == 'b')) && (stop_bit < 8)) ||
|
|
((port == 'g') && (stop_bit < 32))))) {
|
|
return -EINVAL;
|
|
}
|
|
|
|
mask = create_mask(stop_bit + 1);
|
|
tmp_mask = create_mask(start_bit);
|
|
mask &= ~tmp_mask;
|
|
|
|
DBG(printk("cris_io_interface_allocate_pins: port=%c start=%u stop=%u mask=0x%08x\n",
|
|
port, start_bit, stop_bit, mask));
|
|
|
|
local_irq_save(flags);
|
|
|
|
switch (port) {
|
|
case 'a':
|
|
if ((gpio_pa_pins & mask) != mask) {
|
|
local_irq_restore(flags);
|
|
return -EBUSY;
|
|
}
|
|
owners = gpio_pa_owners;
|
|
gpio_pa_pins &= ~mask;
|
|
break;
|
|
case 'b':
|
|
if ((gpio_pb_pins & mask) != mask) {
|
|
local_irq_restore(flags);
|
|
return -EBUSY;
|
|
}
|
|
owners = gpio_pb_owners;
|
|
gpio_pb_pins &= ~mask;
|
|
break;
|
|
case 'g':
|
|
if (((gpio_in_pins & mask) != mask) ||
|
|
((gpio_out_pins & mask) != mask)) {
|
|
local_irq_restore(flags);
|
|
return -EBUSY;
|
|
}
|
|
owners = gpio_pg_owners;
|
|
gpio_in_pins &= ~mask;
|
|
gpio_out_pins &= ~mask;
|
|
break;
|
|
default:
|
|
local_irq_restore(flags);
|
|
return -EINVAL;
|
|
}
|
|
|
|
for (i = start_bit; i <= stop_bit; i++) {
|
|
owners[i] = ioif;
|
|
}
|
|
local_irq_restore(flags);
|
|
|
|
notify_watchers();
|
|
return 0;
|
|
}
|
|
|
|
|
|
/* port can be 'a', 'b' or 'g' */
|
|
int cris_io_interface_free_pins(const enum cris_io_interface ioif,
|
|
const char port,
|
|
const unsigned start_bit,
|
|
const unsigned stop_bit)
|
|
{
|
|
unsigned int i;
|
|
unsigned int mask = 0;
|
|
unsigned int tmp_mask;
|
|
unsigned long int flags;
|
|
enum cris_io_interface *owners;
|
|
|
|
(void)cris_io_interface_init();
|
|
|
|
if (!((start_bit <= stop_bit) &&
|
|
((((port == 'a') || (port == 'b')) && (stop_bit < 8)) ||
|
|
((port == 'g') && (stop_bit < 32))))) {
|
|
return -EINVAL;
|
|
}
|
|
|
|
mask = create_mask(stop_bit + 1);
|
|
tmp_mask = create_mask(start_bit);
|
|
mask &= ~tmp_mask;
|
|
|
|
DBG(printk("cris_io_interface_free_pins: port=%c start=%u stop=%u mask=0x%08x\n",
|
|
port, start_bit, stop_bit, mask));
|
|
|
|
local_irq_save(flags);
|
|
|
|
switch (port) {
|
|
case 'a':
|
|
if ((~gpio_pa_pins & mask) != mask) {
|
|
local_irq_restore(flags);
|
|
printk(KERN_CRIT "cris_io_interface_free_pins: Freeing free pins");
|
|
}
|
|
owners = gpio_pa_owners;
|
|
break;
|
|
case 'b':
|
|
if ((~gpio_pb_pins & mask) != mask) {
|
|
local_irq_restore(flags);
|
|
printk(KERN_CRIT "cris_io_interface_free_pins: Freeing free pins");
|
|
}
|
|
owners = gpio_pb_owners;
|
|
break;
|
|
case 'g':
|
|
if (((~gpio_in_pins & mask) != mask) ||
|
|
((~gpio_out_pins & mask) != mask)) {
|
|
local_irq_restore(flags);
|
|
printk(KERN_CRIT "cris_io_interface_free_pins: Freeing free pins");
|
|
}
|
|
owners = gpio_pg_owners;
|
|
break;
|
|
default:
|
|
owners = NULL; /* Cannot happen. Shut up, gcc! */
|
|
}
|
|
|
|
for (i = start_bit; i <= stop_bit; i++) {
|
|
if (owners[i] != ioif) {
|
|
printk(KERN_CRIT "cris_io_interface_free_pins: Freeing unowned pins");
|
|
}
|
|
}
|
|
|
|
/* All was ok, change data. */
|
|
switch (port) {
|
|
case 'a':
|
|
gpio_pa_pins |= mask;
|
|
break;
|
|
case 'b':
|
|
gpio_pb_pins |= mask;
|
|
break;
|
|
case 'g':
|
|
gpio_in_pins |= mask;
|
|
gpio_out_pins |= mask;
|
|
break;
|
|
}
|
|
|
|
for (i = start_bit; i <= stop_bit; i++) {
|
|
owners[i] = if_unclaimed;
|
|
}
|
|
local_irq_restore(flags);
|
|
notify_watchers();
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
int cris_io_interface_register_watcher(void (*notify)(const unsigned int gpio_in_available,
|
|
const unsigned int gpio_out_available,
|
|
const unsigned char pa_available,
|
|
const unsigned char pb_available))
|
|
{
|
|
struct watcher *w;
|
|
|
|
(void)cris_io_interface_init();
|
|
|
|
if (NULL == notify) {
|
|
return -EINVAL;
|
|
}
|
|
w = kmalloc(sizeof(*w), GFP_KERNEL);
|
|
if (!w) {
|
|
return -ENOMEM;
|
|
}
|
|
w->notify = notify;
|
|
w->next = watchers;
|
|
watchers = w;
|
|
|
|
w->notify((const unsigned int)gpio_in_pins,
|
|
(const unsigned int)gpio_out_pins,
|
|
(const unsigned char)gpio_pa_pins,
|
|
(const unsigned char)gpio_pb_pins);
|
|
|
|
return 0;
|
|
}
|
|
|
|
void cris_io_interface_delete_watcher(void (*notify)(const unsigned int gpio_in_available,
|
|
const unsigned int gpio_out_available,
|
|
const unsigned char pa_available,
|
|
const unsigned char pb_available))
|
|
{
|
|
struct watcher *w = watchers, *prev = NULL;
|
|
|
|
(void)cris_io_interface_init();
|
|
|
|
while ((NULL != w) && (w->notify != notify)){
|
|
prev = w;
|
|
w = w->next;
|
|
}
|
|
if (NULL != w) {
|
|
if (NULL != prev) {
|
|
prev->next = w->next;
|
|
} else {
|
|
watchers = w->next;
|
|
}
|
|
kfree(w);
|
|
return;
|
|
}
|
|
printk(KERN_WARNING "cris_io_interface_delete_watcher: Deleting unknown watcher 0x%p\n", notify);
|
|
}
|
|
|
|
|
|
static int cris_io_interface_init(void)
|
|
{
|
|
static int first = 1;
|
|
int i;
|
|
|
|
if (!first) {
|
|
return 0;
|
|
}
|
|
first = 0;
|
|
|
|
for (i = 0; i<8; i++) {
|
|
gpio_pa_owners[i] = if_unclaimed;
|
|
gpio_pb_owners[i] = if_unclaimed;
|
|
gpio_pg_owners[i] = if_unclaimed;
|
|
}
|
|
for (; i<32; i++) {
|
|
gpio_pg_owners[i] = if_unclaimed;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|
|
module_init(cris_io_interface_init);
|
|
|
|
|
|
EXPORT_SYMBOL(cris_request_io_interface);
|
|
EXPORT_SYMBOL(cris_free_io_interface);
|
|
EXPORT_SYMBOL(cris_io_interface_allocate_pins);
|
|
EXPORT_SYMBOL(cris_io_interface_free_pins);
|
|
EXPORT_SYMBOL(cris_io_interface_register_watcher);
|
|
EXPORT_SYMBOL(cris_io_interface_delete_watcher);
|