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gpio: Add Aspeed GPIO driver
The Aspeed GPIO driver supports the GPIO controllers found in the AST2400, AST2500 and AST2600 BMC SoCs. The implementation is a cut-down copy of the upstream Linux kernel driver, adapted for u-boot. Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
This commit is contained in:
Andrew Jeffery
Tom Rini
parent
4a9099ef1c
commit
7ad889b0f3
@ -127,6 +127,13 @@ config ATMEL_PIO4
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may be dedicated as a general purpose I/O or be assigned to
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a function of an embedded peripheral.
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config ASPEED_GPIO
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bool "Aspeed GPIO Driver"
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help
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Say yes here to support the Aspeed GPIO driver. The controller
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is found in the AST2400, AST2500 and AST2600 BMC SoCs and
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provides access to over 200 GPIOs on each chip.
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config DA8XX_GPIO
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bool "DA8xx GPIO Driver"
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help
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@ -12,6 +12,7 @@ obj-$(CONFIG_$(SPL_TPL_)DM_GPIO) += gpio-uclass.o
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obj-$(CONFIG_$(SPL_)DM_PCA953X) += pca953x_gpio.o
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obj-$(CONFIG_ASPEED_GPIO) += gpio-aspeed.o
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obj-$(CONFIG_AT91_GPIO) += at91_gpio.o
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obj-$(CONFIG_ATMEL_PIO4) += atmel_pio4.o
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obj-$(CONFIG_BCM6345_GPIO) += bcm6345_gpio.o
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299
drivers/gpio/gpio-aspeed.c
Normal file
299
drivers/gpio/gpio-aspeed.c
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@ -0,0 +1,299 @@
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// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright 2015 IBM Corp.
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* Joel Stanley <joel@jms.id.au>
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* Ryan Chen <ryan_chen@aspeedtech.com>
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*
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* Implementation extracted from the Linux kernel and adapted for u-boot.
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*/
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#include <common.h>
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#include <asm/io.h>
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#include <asm/gpio.h>
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#include <config.h>
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#include <common.h>
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#include <clk.h>
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#include <dm.h>
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#include <asm/io.h>
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#include <linux/bug.h>
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#include <linux/sizes.h>
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struct aspeed_gpio_priv {
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void *regs;
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};
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struct aspeed_gpio_bank {
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u16 val_regs; /* +0: Rd: read input value, Wr: set write latch
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* +4: Rd/Wr: Direction (0=in, 1=out)
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*/
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u16 rdata_reg; /* Rd: read write latch, Wr: <none> */
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u16 irq_regs;
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u16 debounce_regs;
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u16 tolerance_regs;
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u16 cmdsrc_regs;
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const char names[4][3];
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};
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static const struct aspeed_gpio_bank aspeed_gpio_banks[] = {
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{
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.val_regs = 0x0000,
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.rdata_reg = 0x00c0,
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.irq_regs = 0x0008,
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.debounce_regs = 0x0040,
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.tolerance_regs = 0x001c,
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.cmdsrc_regs = 0x0060,
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.names = { "A", "B", "C", "D" },
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},
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{
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.val_regs = 0x0020,
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.rdata_reg = 0x00c4,
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.irq_regs = 0x0028,
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.debounce_regs = 0x0048,
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.tolerance_regs = 0x003c,
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.cmdsrc_regs = 0x0068,
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.names = { "E", "F", "G", "H" },
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},
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{
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.val_regs = 0x0070,
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.rdata_reg = 0x00c8,
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.irq_regs = 0x0098,
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.debounce_regs = 0x00b0,
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.tolerance_regs = 0x00ac,
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.cmdsrc_regs = 0x0090,
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.names = { "I", "J", "K", "L" },
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},
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{
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.val_regs = 0x0078,
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.rdata_reg = 0x00cc,
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.irq_regs = 0x00e8,
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.debounce_regs = 0x0100,
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.tolerance_regs = 0x00fc,
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.cmdsrc_regs = 0x00e0,
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.names = { "M", "N", "O", "P" },
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},
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{
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.val_regs = 0x0080,
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.rdata_reg = 0x00d0,
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.irq_regs = 0x0118,
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.debounce_regs = 0x0130,
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.tolerance_regs = 0x012c,
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.cmdsrc_regs = 0x0110,
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.names = { "Q", "R", "S", "T" },
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},
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{
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.val_regs = 0x0088,
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.rdata_reg = 0x00d4,
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.irq_regs = 0x0148,
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.debounce_regs = 0x0160,
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.tolerance_regs = 0x015c,
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.cmdsrc_regs = 0x0140,
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.names = { "U", "V", "W", "X" },
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},
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{
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.val_regs = 0x01E0,
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.rdata_reg = 0x00d8,
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.irq_regs = 0x0178,
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.debounce_regs = 0x0190,
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.tolerance_regs = 0x018c,
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.cmdsrc_regs = 0x0170,
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.names = { "Y", "Z", "AA", "AB" },
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},
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{
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.val_regs = 0x01e8,
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.rdata_reg = 0x00dc,
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.irq_regs = 0x01a8,
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.debounce_regs = 0x01c0,
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.tolerance_regs = 0x01bc,
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.cmdsrc_regs = 0x01a0,
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.names = { "AC", "", "", "" },
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},
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};
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enum aspeed_gpio_reg {
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reg_val,
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reg_rdata,
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reg_dir,
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reg_irq_enable,
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reg_irq_type0,
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reg_irq_type1,
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reg_irq_type2,
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reg_irq_status,
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reg_debounce_sel1,
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reg_debounce_sel2,
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reg_tolerance,
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reg_cmdsrc0,
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reg_cmdsrc1,
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};
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#define GPIO_VAL_VALUE 0x00
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#define GPIO_VAL_DIR 0x04
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#define GPIO_IRQ_ENABLE 0x00
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#define GPIO_IRQ_TYPE0 0x04
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#define GPIO_IRQ_TYPE1 0x08
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#define GPIO_IRQ_TYPE2 0x0c
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#define GPIO_IRQ_STATUS 0x10
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#define GPIO_DEBOUNCE_SEL1 0x00
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#define GPIO_DEBOUNCE_SEL2 0x04
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#define GPIO_CMDSRC_0 0x00
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#define GPIO_CMDSRC_1 0x04
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#define GPIO_CMDSRC_ARM 0
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#define GPIO_CMDSRC_LPC 1
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#define GPIO_CMDSRC_COLDFIRE 2
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#define GPIO_CMDSRC_RESERVED 3
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/* This will be resolved at compile time */
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static inline void __iomem *bank_reg(struct aspeed_gpio_priv *gpio,
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const struct aspeed_gpio_bank *bank,
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const enum aspeed_gpio_reg reg)
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{
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switch (reg) {
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case reg_val:
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return gpio->regs + bank->val_regs + GPIO_VAL_VALUE;
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case reg_rdata:
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return gpio->regs + bank->rdata_reg;
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case reg_dir:
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return gpio->regs + bank->val_regs + GPIO_VAL_DIR;
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case reg_irq_enable:
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return gpio->regs + bank->irq_regs + GPIO_IRQ_ENABLE;
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case reg_irq_type0:
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return gpio->regs + bank->irq_regs + GPIO_IRQ_TYPE0;
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case reg_irq_type1:
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return gpio->regs + bank->irq_regs + GPIO_IRQ_TYPE1;
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case reg_irq_type2:
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return gpio->regs + bank->irq_regs + GPIO_IRQ_TYPE2;
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case reg_irq_status:
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return gpio->regs + bank->irq_regs + GPIO_IRQ_STATUS;
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case reg_debounce_sel1:
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return gpio->regs + bank->debounce_regs + GPIO_DEBOUNCE_SEL1;
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case reg_debounce_sel2:
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return gpio->regs + bank->debounce_regs + GPIO_DEBOUNCE_SEL2;
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case reg_tolerance:
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return gpio->regs + bank->tolerance_regs;
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case reg_cmdsrc0:
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return gpio->regs + bank->cmdsrc_regs + GPIO_CMDSRC_0;
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case reg_cmdsrc1:
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return gpio->regs + bank->cmdsrc_regs + GPIO_CMDSRC_1;
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}
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BUG();
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}
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#define GPIO_BANK(x) ((x) >> 5)
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#define GPIO_OFFSET(x) ((x) & 0x1f)
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#define GPIO_BIT(x) BIT(GPIO_OFFSET(x))
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static const struct aspeed_gpio_bank *to_bank(unsigned int offset)
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{
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unsigned int bank = GPIO_BANK(offset);
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WARN_ON(bank >= ARRAY_SIZE(aspeed_gpio_banks));
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return &aspeed_gpio_banks[bank];
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}
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static int
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aspeed_gpio_direction_input(struct udevice *dev, unsigned int offset)
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{
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struct aspeed_gpio_priv *priv = dev_get_priv(dev);
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const struct aspeed_gpio_bank *bank = to_bank(offset);
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u32 dir = readl(bank_reg(priv, bank, reg_dir));
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dir &= ~GPIO_BIT(offset);
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writel(dir, bank_reg(priv, bank, reg_dir));
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return 0;
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}
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static int aspeed_gpio_direction_output(struct udevice *dev, unsigned int offset,
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int value)
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{
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struct aspeed_gpio_priv *priv = dev_get_priv(dev);
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const struct aspeed_gpio_bank *bank = to_bank(offset);
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u32 dir = readl(bank_reg(priv, bank, reg_dir));
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u32 output = readl(bank_reg(priv, bank, reg_val));
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dir |= GPIO_BIT(offset);
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writel(dir, bank_reg(priv, bank, reg_dir));
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if (value)
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output |= GPIO_BIT(offset);
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else
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output &= ~GPIO_BIT(offset);
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writel(output, bank_reg(priv, bank, reg_val));
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return 0;
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}
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static int aspeed_gpio_get_value(struct udevice *dev, unsigned int offset)
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{
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struct aspeed_gpio_priv *priv = dev_get_priv(dev);
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const struct aspeed_gpio_bank *bank = to_bank(offset);
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return !!(readl(bank_reg(priv, bank, reg_val)) & GPIO_BIT(offset));
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}
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static int
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aspeed_gpio_set_value(struct udevice *dev, unsigned int offset, int value)
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{
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struct aspeed_gpio_priv *priv = dev_get_priv(dev);
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const struct aspeed_gpio_bank *bank = to_bank(offset);
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u32 data = readl(bank_reg(priv, bank, reg_val));
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if (value)
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data |= GPIO_BIT(offset);
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else
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data &= ~GPIO_BIT(offset);
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writel(data, bank_reg(priv, bank, reg_val));
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return 0;
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}
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static int aspeed_gpio_get_function(struct udevice *dev, unsigned int offset)
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{
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struct aspeed_gpio_priv *priv = dev_get_priv(dev);
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const struct aspeed_gpio_bank *bank = to_bank(offset);
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if (readl(bank_reg(priv, bank, reg_dir)) & GPIO_BIT(offset))
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return GPIOF_OUTPUT;
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return GPIOF_INPUT;
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}
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static const struct dm_gpio_ops aspeed_gpio_ops = {
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.direction_input = aspeed_gpio_direction_input,
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.direction_output = aspeed_gpio_direction_output,
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.get_value = aspeed_gpio_get_value,
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.set_value = aspeed_gpio_set_value,
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.get_function = aspeed_gpio_get_function,
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};
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static int aspeed_gpio_probe(struct udevice *dev)
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{
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struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
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struct aspeed_gpio_priv *priv = dev_get_priv(dev);
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uc_priv->bank_name = dev->name;
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ofnode_read_u32(dev_ofnode(dev), "ngpios", &uc_priv->gpio_count);
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priv->regs = devfdt_get_addr_ptr(dev);
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return 0;
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}
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static const struct udevice_id aspeed_gpio_ids[] = {
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{ .compatible = "aspeed,ast2400-gpio", },
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{ .compatible = "aspeed,ast2500-gpio", },
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{ .compatible = "aspeed,ast2600-gpio", },
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{ }
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};
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U_BOOT_DRIVER(gpio_aspeed) = {
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.name = "gpio-aspeed",
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.id = UCLASS_GPIO,
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.of_match = aspeed_gpio_ids,
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.ops = &aspeed_gpio_ops,
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.probe = aspeed_gpio_probe,
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.priv_auto = sizeof(struct aspeed_gpio_priv),
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};
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