447 lines
12 KiB
C
447 lines
12 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Digital I/O driver for Technologic Systems TS-5500
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*
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* Copyright (c) 2012 Savoir-faire Linux Inc.
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* Vivien Didelot <vivien.didelot@savoirfairelinux.com>
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*
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* Technologic Systems platforms have pin blocks, exposing several Digital
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* Input/Output lines (DIO). This driver aims to support single pin blocks.
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* In that sense, the support is not limited to the TS-5500 blocks.
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* Actually, the following platforms have DIO support:
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*
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* TS-5500:
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* Documentation: http://wiki.embeddedarm.com/wiki/TS-5500
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* Blocks: DIO1, DIO2 and LCD port.
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*
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* TS-5600:
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* Documentation: http://wiki.embeddedarm.com/wiki/TS-5600
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* Blocks: LCD port (identical to TS-5500 LCD).
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*/
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#include <linux/bitops.h>
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#include <linux/gpio/driver.h>
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#include <linux/io.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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/* List of supported Technologic Systems platforms DIO blocks */
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enum ts5500_blocks { TS5500_DIO1, TS5500_DIO2, TS5500_LCD, TS5600_LCD };
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struct ts5500_priv {
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const struct ts5500_dio *pinout;
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struct gpio_chip gpio_chip;
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spinlock_t lock;
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bool strap;
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u8 hwirq;
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};
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/*
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* Hex 7D is used to control several blocks (e.g. DIO2 and LCD port).
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* This flag ensures that the region has been requested by this driver.
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*/
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static bool hex7d_reserved;
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/*
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* This structure is used to describe capabilities of DIO lines,
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* such as available directions and connected interrupt (if any).
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*/
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struct ts5500_dio {
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const u8 value_addr;
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const u8 value_mask;
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const u8 control_addr;
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const u8 control_mask;
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const bool no_input;
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const bool no_output;
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const u8 irq;
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};
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#define TS5500_DIO_IN_OUT(vaddr, vbit, caddr, cbit) \
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{ \
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.value_addr = vaddr, \
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.value_mask = BIT(vbit), \
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.control_addr = caddr, \
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.control_mask = BIT(cbit), \
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}
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#define TS5500_DIO_IN(addr, bit) \
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{ \
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.value_addr = addr, \
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.value_mask = BIT(bit), \
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.no_output = true, \
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}
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#define TS5500_DIO_IN_IRQ(addr, bit, _irq) \
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{ \
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.value_addr = addr, \
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.value_mask = BIT(bit), \
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.no_output = true, \
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.irq = _irq, \
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}
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#define TS5500_DIO_OUT(addr, bit) \
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{ \
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.value_addr = addr, \
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.value_mask = BIT(bit), \
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.no_input = true, \
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}
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/*
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* Input/Output DIO lines are programmed in groups of 4. Their values are
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* available through 4 consecutive bits in a value port, whereas the direction
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* of these 4 lines is driven by only 1 bit in a control port.
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*/
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#define TS5500_DIO_GROUP(vaddr, vbitfrom, caddr, cbit) \
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TS5500_DIO_IN_OUT(vaddr, vbitfrom + 0, caddr, cbit), \
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TS5500_DIO_IN_OUT(vaddr, vbitfrom + 1, caddr, cbit), \
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TS5500_DIO_IN_OUT(vaddr, vbitfrom + 2, caddr, cbit), \
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TS5500_DIO_IN_OUT(vaddr, vbitfrom + 3, caddr, cbit)
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/*
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* TS-5500 DIO1 block
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*
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* value control dir hw
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* addr bit addr bit in out irq name pin offset
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*
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* 0x7b 0 0x7a 0 x x DIO1_0 1 0
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* 0x7b 1 0x7a 0 x x DIO1_1 3 1
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* 0x7b 2 0x7a 0 x x DIO1_2 5 2
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* 0x7b 3 0x7a 0 x x DIO1_3 7 3
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* 0x7b 4 0x7a 1 x x DIO1_4 9 4
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* 0x7b 5 0x7a 1 x x DIO1_5 11 5
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* 0x7b 6 0x7a 1 x x DIO1_6 13 6
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* 0x7b 7 0x7a 1 x x DIO1_7 15 7
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* 0x7c 0 0x7a 5 x x DIO1_8 4 8
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* 0x7c 1 0x7a 5 x x DIO1_9 6 9
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* 0x7c 2 0x7a 5 x x DIO1_10 8 10
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* 0x7c 3 0x7a 5 x x DIO1_11 10 11
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* 0x7c 4 x DIO1_12 12 12
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* 0x7c 5 x 7 DIO1_13 14 13
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*/
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static const struct ts5500_dio ts5500_dio1[] = {
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TS5500_DIO_GROUP(0x7b, 0, 0x7a, 0),
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TS5500_DIO_GROUP(0x7b, 4, 0x7a, 1),
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TS5500_DIO_GROUP(0x7c, 0, 0x7a, 5),
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TS5500_DIO_IN(0x7c, 4),
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TS5500_DIO_IN_IRQ(0x7c, 5, 7),
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};
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/*
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* TS-5500 DIO2 block
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*
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* value control dir hw
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* addr bit addr bit in out irq name pin offset
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*
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* 0x7e 0 0x7d 0 x x DIO2_0 1 0
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* 0x7e 1 0x7d 0 x x DIO2_1 3 1
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* 0x7e 2 0x7d 0 x x DIO2_2 5 2
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* 0x7e 3 0x7d 0 x x DIO2_3 7 3
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* 0x7e 4 0x7d 1 x x DIO2_4 9 4
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* 0x7e 5 0x7d 1 x x DIO2_5 11 5
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* 0x7e 6 0x7d 1 x x DIO2_6 13 6
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* 0x7e 7 0x7d 1 x x DIO2_7 15 7
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* 0x7f 0 0x7d 5 x x DIO2_8 4 8
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* 0x7f 1 0x7d 5 x x DIO2_9 6 9
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* 0x7f 2 0x7d 5 x x DIO2_10 8 10
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* 0x7f 3 0x7d 5 x x DIO2_11 10 11
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* 0x7f 4 x 6 DIO2_13 14 12
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*/
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static const struct ts5500_dio ts5500_dio2[] = {
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TS5500_DIO_GROUP(0x7e, 0, 0x7d, 0),
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TS5500_DIO_GROUP(0x7e, 4, 0x7d, 1),
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TS5500_DIO_GROUP(0x7f, 0, 0x7d, 5),
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TS5500_DIO_IN_IRQ(0x7f, 4, 6),
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};
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/*
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* TS-5500 LCD port used as DIO block
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* TS-5600 LCD port is identical
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*
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* value control dir hw
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* addr bit addr bit in out irq name pin offset
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*
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* 0x72 0 0x7d 2 x x LCD_0 8 0
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* 0x72 1 0x7d 2 x x LCD_1 7 1
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* 0x72 2 0x7d 2 x x LCD_2 10 2
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* 0x72 3 0x7d 2 x x LCD_3 9 3
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* 0x72 4 0x7d 3 x x LCD_4 12 4
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* 0x72 5 0x7d 3 x x LCD_5 11 5
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* 0x72 6 0x7d 3 x x LCD_6 14 6
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* 0x72 7 0x7d 3 x x LCD_7 13 7
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* 0x73 0 x LCD_EN 5 8
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* 0x73 6 x LCD_WR 6 9
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* 0x73 7 x 1 LCD_RS 3 10
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*/
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static const struct ts5500_dio ts5500_lcd[] = {
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TS5500_DIO_GROUP(0x72, 0, 0x7d, 2),
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TS5500_DIO_GROUP(0x72, 4, 0x7d, 3),
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TS5500_DIO_OUT(0x73, 0),
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TS5500_DIO_IN(0x73, 6),
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TS5500_DIO_IN_IRQ(0x73, 7, 1),
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};
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static inline void ts5500_set_mask(u8 mask, u8 addr)
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{
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u8 val = inb(addr);
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val |= mask;
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outb(val, addr);
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}
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static inline void ts5500_clear_mask(u8 mask, u8 addr)
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{
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u8 val = inb(addr);
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val &= ~mask;
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outb(val, addr);
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}
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static int ts5500_gpio_input(struct gpio_chip *chip, unsigned offset)
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{
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struct ts5500_priv *priv = gpiochip_get_data(chip);
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const struct ts5500_dio line = priv->pinout[offset];
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unsigned long flags;
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if (line.no_input)
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return -ENXIO;
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if (line.no_output)
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return 0;
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spin_lock_irqsave(&priv->lock, flags);
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ts5500_clear_mask(line.control_mask, line.control_addr);
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spin_unlock_irqrestore(&priv->lock, flags);
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return 0;
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}
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static int ts5500_gpio_get(struct gpio_chip *chip, unsigned offset)
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{
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struct ts5500_priv *priv = gpiochip_get_data(chip);
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const struct ts5500_dio line = priv->pinout[offset];
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return !!(inb(line.value_addr) & line.value_mask);
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}
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static int ts5500_gpio_output(struct gpio_chip *chip, unsigned offset, int val)
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{
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struct ts5500_priv *priv = gpiochip_get_data(chip);
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const struct ts5500_dio line = priv->pinout[offset];
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unsigned long flags;
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if (line.no_output)
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return -ENXIO;
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spin_lock_irqsave(&priv->lock, flags);
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if (!line.no_input)
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ts5500_set_mask(line.control_mask, line.control_addr);
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if (val)
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ts5500_set_mask(line.value_mask, line.value_addr);
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else
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ts5500_clear_mask(line.value_mask, line.value_addr);
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spin_unlock_irqrestore(&priv->lock, flags);
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return 0;
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}
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static void ts5500_gpio_set(struct gpio_chip *chip, unsigned offset, int val)
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{
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struct ts5500_priv *priv = gpiochip_get_data(chip);
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const struct ts5500_dio line = priv->pinout[offset];
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unsigned long flags;
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spin_lock_irqsave(&priv->lock, flags);
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if (val)
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ts5500_set_mask(line.value_mask, line.value_addr);
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else
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ts5500_clear_mask(line.value_mask, line.value_addr);
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spin_unlock_irqrestore(&priv->lock, flags);
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}
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static int ts5500_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
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{
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struct ts5500_priv *priv = gpiochip_get_data(chip);
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const struct ts5500_dio *block = priv->pinout;
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const struct ts5500_dio line = block[offset];
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/* Only one pin is connected to an interrupt */
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if (line.irq)
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return line.irq;
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/* As this pin is input-only, we may strap it to another in/out pin */
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if (priv->strap)
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return priv->hwirq;
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return -ENXIO;
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}
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static int ts5500_enable_irq(struct ts5500_priv *priv)
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{
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int ret = 0;
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unsigned long flags;
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spin_lock_irqsave(&priv->lock, flags);
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if (priv->hwirq == 7)
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ts5500_set_mask(BIT(7), 0x7a); /* DIO1_13 on IRQ7 */
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else if (priv->hwirq == 6)
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ts5500_set_mask(BIT(7), 0x7d); /* DIO2_13 on IRQ6 */
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else if (priv->hwirq == 1)
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ts5500_set_mask(BIT(6), 0x7d); /* LCD_RS on IRQ1 */
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else
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ret = -EINVAL;
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spin_unlock_irqrestore(&priv->lock, flags);
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return ret;
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}
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static void ts5500_disable_irq(struct ts5500_priv *priv)
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{
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unsigned long flags;
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spin_lock_irqsave(&priv->lock, flags);
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if (priv->hwirq == 7)
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ts5500_clear_mask(BIT(7), 0x7a); /* DIO1_13 on IRQ7 */
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else if (priv->hwirq == 6)
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ts5500_clear_mask(BIT(7), 0x7d); /* DIO2_13 on IRQ6 */
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else if (priv->hwirq == 1)
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ts5500_clear_mask(BIT(6), 0x7d); /* LCD_RS on IRQ1 */
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else
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dev_err(priv->gpio_chip.parent, "invalid hwirq %d\n",
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priv->hwirq);
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spin_unlock_irqrestore(&priv->lock, flags);
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}
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static int ts5500_dio_probe(struct platform_device *pdev)
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{
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enum ts5500_blocks block = platform_get_device_id(pdev)->driver_data;
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struct device *dev = &pdev->dev;
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const char *name = dev_name(dev);
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struct ts5500_priv *priv;
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unsigned long flags;
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int ret;
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ret = platform_get_irq(pdev, 0);
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if (ret < 0)
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return ret;
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priv = devm_kzalloc(dev, sizeof(struct ts5500_priv), GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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platform_set_drvdata(pdev, priv);
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priv->hwirq = ret;
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spin_lock_init(&priv->lock);
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priv->gpio_chip.owner = THIS_MODULE;
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priv->gpio_chip.label = name;
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priv->gpio_chip.parent = dev;
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priv->gpio_chip.direction_input = ts5500_gpio_input;
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priv->gpio_chip.direction_output = ts5500_gpio_output;
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priv->gpio_chip.get = ts5500_gpio_get;
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priv->gpio_chip.set = ts5500_gpio_set;
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priv->gpio_chip.to_irq = ts5500_gpio_to_irq;
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priv->gpio_chip.base = -1;
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switch (block) {
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case TS5500_DIO1:
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priv->pinout = ts5500_dio1;
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priv->gpio_chip.ngpio = ARRAY_SIZE(ts5500_dio1);
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if (!devm_request_region(dev, 0x7a, 3, name)) {
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dev_err(dev, "failed to request %s ports\n", name);
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return -EBUSY;
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}
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break;
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case TS5500_DIO2:
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priv->pinout = ts5500_dio2;
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priv->gpio_chip.ngpio = ARRAY_SIZE(ts5500_dio2);
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if (!devm_request_region(dev, 0x7e, 2, name)) {
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dev_err(dev, "failed to request %s ports\n", name);
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return -EBUSY;
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}
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if (hex7d_reserved)
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break;
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if (!devm_request_region(dev, 0x7d, 1, name)) {
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dev_err(dev, "failed to request %s 7D\n", name);
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return -EBUSY;
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}
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hex7d_reserved = true;
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break;
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case TS5500_LCD:
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case TS5600_LCD:
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priv->pinout = ts5500_lcd;
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priv->gpio_chip.ngpio = ARRAY_SIZE(ts5500_lcd);
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if (!devm_request_region(dev, 0x72, 2, name)) {
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dev_err(dev, "failed to request %s ports\n", name);
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return -EBUSY;
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}
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if (!hex7d_reserved) {
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if (!devm_request_region(dev, 0x7d, 1, name)) {
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dev_err(dev, "failed to request %s 7D\n", name);
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return -EBUSY;
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}
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hex7d_reserved = true;
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}
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/* Ensure usage of LCD port as DIO */
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spin_lock_irqsave(&priv->lock, flags);
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ts5500_clear_mask(BIT(4), 0x7d);
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spin_unlock_irqrestore(&priv->lock, flags);
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break;
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}
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ret = devm_gpiochip_add_data(dev, &priv->gpio_chip, priv);
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if (ret) {
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dev_err(dev, "failed to register the gpio chip\n");
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return ret;
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}
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ret = ts5500_enable_irq(priv);
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if (ret) {
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dev_err(dev, "invalid interrupt %d\n", priv->hwirq);
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return ret;
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}
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return 0;
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}
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static int ts5500_dio_remove(struct platform_device *pdev)
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{
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struct ts5500_priv *priv = platform_get_drvdata(pdev);
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ts5500_disable_irq(priv);
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return 0;
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}
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static const struct platform_device_id ts5500_dio_ids[] = {
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{ "ts5500-dio1", TS5500_DIO1 },
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{ "ts5500-dio2", TS5500_DIO2 },
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{ "ts5500-dio-lcd", TS5500_LCD },
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{ "ts5600-dio-lcd", TS5600_LCD },
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{ }
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};
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MODULE_DEVICE_TABLE(platform, ts5500_dio_ids);
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static struct platform_driver ts5500_dio_driver = {
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.driver = {
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.name = "ts5500-dio",
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},
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.probe = ts5500_dio_probe,
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.remove = ts5500_dio_remove,
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.id_table = ts5500_dio_ids,
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};
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module_platform_driver(ts5500_dio_driver);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Savoir-faire Linux Inc. <kernel@savoirfairelinux.com>");
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MODULE_DESCRIPTION("Technologic Systems TS-5500 Digital I/O driver");
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