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449 lines
12 KiB
449 lines
12 KiB
// 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 <[email protected]> |
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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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struct resource *res; |
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unsigned long flags; |
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int ret; |
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res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); |
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if (!res) { |
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dev_err(dev, "missing IRQ resource\n"); |
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return -EINVAL; |
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} |
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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 = res->start; |
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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. <[email protected]>"); |
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MODULE_DESCRIPTION("Technologic Systems TS-5500 Digital I/O driver");
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