diff options
author | Jason M. Bills <jason.m.bills@linux.intel.com> | 2019-10-23 00:01:54 +0300 |
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committer | Jason M. Bills <jason.m.bills@linux.intel.com> | 2019-10-23 00:48:48 +0300 |
commit | 456380bb272d3a301c887eee513a3937cc1f48e1 (patch) | |
tree | 124399167d539582befbe35ad28377eaea6cc8bc /meta-openbmc-mods/meta-common/recipes-kernel/linux/linux-aspeed/0016-Add-ASPEED-SGPIO-driver.patch | |
parent | 9722c6ee87766a45a337c094d1293de81cdcb106 (diff) | |
download | openbmc-456380bb272d3a301c887eee513a3937cc1f48e1.tar.xz |
Update to internal 10-22-19
Signed-off-by: Jason M. Bills <jason.m.bills@linux.intel.com>
Diffstat (limited to 'meta-openbmc-mods/meta-common/recipes-kernel/linux/linux-aspeed/0016-Add-ASPEED-SGPIO-driver.patch')
-rw-r--r-- | meta-openbmc-mods/meta-common/recipes-kernel/linux/linux-aspeed/0016-Add-ASPEED-SGPIO-driver.patch | 759 |
1 files changed, 759 insertions, 0 deletions
diff --git a/meta-openbmc-mods/meta-common/recipes-kernel/linux/linux-aspeed/0016-Add-ASPEED-SGPIO-driver.patch b/meta-openbmc-mods/meta-common/recipes-kernel/linux/linux-aspeed/0016-Add-ASPEED-SGPIO-driver.patch new file mode 100644 index 000000000..07bdf60af --- /dev/null +++ b/meta-openbmc-mods/meta-common/recipes-kernel/linux/linux-aspeed/0016-Add-ASPEED-SGPIO-driver.patch @@ -0,0 +1,759 @@ +From ab104c6067683a3a251e2814991474243b7e1cb8 Mon Sep 17 00:00:00 2001 +From: "Feist, James" <james.feist@intel.com> +Date: Tue, 4 Jun 2019 14:00:39 -0700 +Subject: [PATCH] gpio: aspeed: add ASPEED SGPIO driver + +Add SGPIO driver support for Aspeed SoCs. + +Signed-off-by: James Feist <james.feist@linux.intel.com> +Signed-off-by: Jae Hyun Yoo <jae.hyun.yoo@intel.com> +--- + drivers/gpio/Kconfig | 8 + + drivers/gpio/Makefile | 1 + + drivers/gpio/sgpio-aspeed.c | 703 ++++++++++++++++++++++++++++++++++++++++++++ + 3 files changed, 712 insertions(+) + create mode 100644 drivers/gpio/sgpio-aspeed.c + +diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig +index bb13c266c329..4061686d8651 100644 +--- a/drivers/gpio/Kconfig ++++ b/drivers/gpio/Kconfig +@@ -120,6 +120,14 @@ config GPIO_ASPEED + help + Say Y here to support Aspeed AST2400 and AST2500 GPIO controllers. + ++config SGPIO_ASPEED ++ tristate "ASPEED SGPIO support" ++ depends on (ARCH_ASPEED || COMPILE_TEST) && OF_GPIO ++ select GPIO_GENERIC ++ select GPIOLIB_IRQCHIP ++ help ++ Say Y here to support ASPEED SGPIO functionality. ++ + config GPIO_ATH79 + tristate "Atheros AR71XX/AR724X/AR913X GPIO support" + default y if ATH79 +diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile +index a4e91175c708..bebbd8205c11 100644 +--- a/drivers/gpio/Makefile ++++ b/drivers/gpio/Makefile +@@ -32,6 +32,7 @@ obj-$(CONFIG_GPIO_AMD_FCH) += gpio-amd-fch.o + obj-$(CONFIG_GPIO_AMDPT) += gpio-amdpt.o + obj-$(CONFIG_GPIO_ARIZONA) += gpio-arizona.o + obj-$(CONFIG_GPIO_ASPEED) += gpio-aspeed.o ++obj-$(CONFIG_SGPIO_ASPEED) += sgpio-aspeed.o + obj-$(CONFIG_GPIO_ATH79) += gpio-ath79.o + obj-$(CONFIG_GPIO_BCM_KONA) += gpio-bcm-kona.o + obj-$(CONFIG_GPIO_BD70528) += gpio-bd70528.o +diff --git a/drivers/gpio/sgpio-aspeed.c b/drivers/gpio/sgpio-aspeed.c +new file mode 100644 +index 000000000000..b6e9ccee774d +--- /dev/null ++++ b/drivers/gpio/sgpio-aspeed.c +@@ -0,0 +1,703 @@ ++// SPDX-License-Identifier: GPL-2.0+ ++// Copyright (c) 2019 Intel Corporation ++ ++#include <linux/bitfield.h> ++#include <linux/clk.h> ++#include <linux/gpio/driver.h> ++#include <linux/module.h> ++#include <linux/of.h> ++#include <linux/platform_device.h> ++#include <linux/spinlock.h> ++ ++#define ASPEED_SGPIO_CTRL 0x54 ++#define ASPEED_SGPIO_CLK_DIV_MASK GENMASK(31, 16) ++#define ASPEED_SGPIO_CLK_DIV_MIN 1 ++#define ASPEED_SGPIO_CLK_DIV_MAX 65535 ++#define ASPEED_SGPIO_PINBYTES_MASK GENMASK(9, 6) ++#define ASPEED_SGPIO_PINBYTES_MIN 1 ++#define ASPEED_SGPIO_PINBYTES_MAX 10 ++#define ASPEED_SGPIO_ENABLE BIT(0) ++ ++#define ASPEED_SGPIO_BUS_FREQ_DEFAULT 1000000 ++ ++struct aspeed_bank_props { ++ unsigned int bank; ++ u32 input; ++ u32 output; ++}; ++ ++struct aspeed_sgpio_config { ++ unsigned int nr_pgpios; ++ unsigned int nr_gpios; ++ const struct aspeed_bank_props *props; ++}; ++ ++struct aspeed_sgpio { ++ struct gpio_chip chip; ++ struct irq_chip irqc; ++ spinlock_t lock; ++ void __iomem *base; ++ int irq; ++ const struct aspeed_sgpio_config *config; ++}; ++ ++struct aspeed_sgpio_bank { ++ uint16_t val_reg; ++ uint16_t rdata_reg; ++ uint16_t tolerance_reg; ++ uint16_t irq_regs; ++ bool support_irq; ++ const char names[4][3]; ++}; ++ ++/* ++ * Note: The "val" register returns the input value sampled on the line. ++ * Or, it can be used for writing a value on the line. ++ * ++ * The "rdata" register returns the content of the write latch and thus ++ * can be used to read back what was last written reliably. ++ */ ++ ++static const struct aspeed_sgpio_bank aspeed_sgpio_banks[] = { ++ { ++ .val_reg = 0x0000, ++ .rdata_reg = 0x0070, ++ .tolerance_reg = 0x0018, ++ .irq_regs = 0x0004, ++ .support_irq = false, ++ .names = { "OA", "OB", "OC", "OD" }, ++ }, ++ { ++ .val_reg = 0x001C, ++ .rdata_reg = 0x0074, ++ .tolerance_reg = 0x0034, ++ .irq_regs = 0x0020, ++ .support_irq = false, ++ .names = { "OE", "OF", "OG", "OH" }, ++ }, ++ { ++ .val_reg = 0x0038, ++ .rdata_reg = 0x0078, ++ .tolerance_reg = 0x0050, ++ .irq_regs = 0x003C, ++ .support_irq = false, ++ .names = { "OI", "OJ" }, ++ }, ++ { ++ .val_reg = 0x0000, ++ .rdata_reg = 0x0070, ++ .tolerance_reg = 0x0018, ++ .irq_regs = 0x0004, ++ .support_irq = true, ++ .names = { "IA", "IB", "IC", "ID" }, ++ }, ++ { ++ .val_reg = 0x001C, ++ .rdata_reg = 0x0074, ++ .tolerance_reg = 0x0034, ++ .irq_regs = 0x0020, ++ .support_irq = true, ++ .names = { "IE", "IF", "IG", "IH" }, ++ }, ++ { ++ .val_reg = 0x0038, ++ .rdata_reg = 0x0078, ++ .tolerance_reg = 0x0050, ++ .irq_regs = 0x003C, ++ .support_irq = true, ++ .names = { "II", "IJ" }, ++ }, ++}; ++ ++enum aspeed_sgpio_reg { ++ reg_val, ++ reg_rdata, ++ reg_irq_enable, ++ reg_irq_type0, ++ reg_irq_type1, ++ reg_irq_type2, ++ reg_irq_status, ++ reg_tolerance, ++}; ++ ++#define GPIO_IRQ_ENABLE 0x00 ++#define GPIO_IRQ_TYPE0 0x04 ++#define GPIO_IRQ_TYPE1 0x08 ++#define GPIO_IRQ_TYPE2 0x0c ++#define GPIO_IRQ_STATUS 0x10 ++ ++/* This will be resolved at compile time */ ++static inline void __iomem *bank_reg(struct aspeed_sgpio *gpio, ++ const struct aspeed_sgpio_bank *bank, ++ const enum aspeed_sgpio_reg reg) ++{ ++ switch (reg) { ++ case reg_val: ++ return gpio->base + bank->val_reg; ++ case reg_rdata: ++ return gpio->base + bank->rdata_reg; ++ case reg_irq_enable: ++ return gpio->base + bank->irq_regs + GPIO_IRQ_ENABLE; ++ case reg_irq_type0: ++ return gpio->base + bank->irq_regs + GPIO_IRQ_TYPE0; ++ case reg_irq_type1: ++ return gpio->base + bank->irq_regs + GPIO_IRQ_TYPE1; ++ case reg_irq_type2: ++ return gpio->base + bank->irq_regs + GPIO_IRQ_TYPE2; ++ case reg_irq_status: ++ return gpio->base + bank->irq_regs + GPIO_IRQ_STATUS; ++ case reg_tolerance: ++ return gpio->base + bank->tolerance_reg; ++ default: ++ WARN_ON(1); ++ } ++ ++ return NULL; ++} ++ ++#define GPIO_BANK(x) ((x) >> 5) ++#define GPIO_OFFSET(x) ((x) & 0x1f) ++#define GPIO_BIT(x) BIT(GPIO_OFFSET(x)) ++ ++static const struct aspeed_sgpio_bank *to_bank(unsigned int offset) ++{ ++ unsigned int bank = GPIO_BANK(offset); ++ ++ WARN_ON(bank >= ARRAY_SIZE(aspeed_sgpio_banks)); ++ return &aspeed_sgpio_banks[bank]; ++} ++ ++static inline bool is_bank_props_sentinel(const struct aspeed_bank_props *props) ++{ ++ return !(props->input || props->output); ++} ++ ++static inline const struct aspeed_bank_props *find_bank_props( ++ struct aspeed_sgpio *gpio, unsigned int offset) ++{ ++ const struct aspeed_bank_props *props = gpio->config->props; ++ ++ while (!is_bank_props_sentinel(props)) { ++ if (props->bank == GPIO_BANK(offset)) ++ return props; ++ props++; ++ } ++ ++ return NULL; ++} ++ ++static inline bool have_input(struct aspeed_sgpio *gpio, unsigned int offset) ++{ ++ const struct aspeed_bank_props *props = find_bank_props(gpio, offset); ++ ++ return !props || (props->input & GPIO_BIT(offset)); ++} ++ ++static inline bool have_output(struct aspeed_sgpio *gpio, unsigned int offset) ++{ ++ const struct aspeed_bank_props *props = find_bank_props(gpio, offset); ++ ++ return !props || (props->output & GPIO_BIT(offset)); ++} ++ ++static int aspeed_sgpio_get(struct gpio_chip *gc, unsigned int offset) ++{ ++ struct aspeed_sgpio *gpio = gpiochip_get_data(gc); ++ const struct aspeed_sgpio_bank *bank = to_bank(offset); ++ enum aspeed_sgpio_reg reg; ++ ++ if (have_output(gpio, offset)) ++ reg = reg_rdata; ++ else ++ reg = reg_val; ++ ++ return !!(ioread32(bank_reg(gpio, bank, reg)) & GPIO_BIT(offset)); ++} ++ ++static void aspeed_sgpio_set(struct gpio_chip *gc, unsigned int offset, int val) ++{ ++ const struct aspeed_sgpio_bank *bank = to_bank(offset); ++ struct aspeed_sgpio *gpio = gpiochip_get_data(gc); ++ unsigned long flags; ++ u32 reg; ++ ++ if (!have_output(gpio, offset)) ++ return; ++ ++ spin_lock_irqsave(&gpio->lock, flags); ++ ++ reg = ioread32(bank_reg(gpio, bank, reg_rdata)); ++ ++ if (val) ++ reg |= GPIO_BIT(offset); ++ else ++ reg &= ~GPIO_BIT(offset); ++ ++ iowrite32(reg, bank_reg(gpio, bank, reg_val)); ++ ++ spin_unlock_irqrestore(&gpio->lock, flags); ++} ++ ++static int aspeed_sgpio_dir_in(struct gpio_chip *gc, unsigned int offset) ++{ ++ struct aspeed_sgpio *gpio = gpiochip_get_data(gc); ++ ++ if (!have_input(gpio, offset)) ++ return -ENOTSUPP; ++ ++ return 0; ++} ++ ++static int aspeed_sgpio_dir_out(struct gpio_chip *gc, unsigned int offset, ++ int val) ++{ ++ struct aspeed_sgpio *gpio = gpiochip_get_data(gc); ++ ++ if (!have_output(gpio, offset)) ++ return -ENOTSUPP; ++ ++ aspeed_sgpio_set(gc, offset, val); ++ ++ return 0; ++} ++ ++static int aspeed_sgpio_get_direction(struct gpio_chip *gc, unsigned int offset) ++{ ++ struct aspeed_sgpio *gpio = gpiochip_get_data(gc); ++ ++ if (have_output(gpio, offset)) ++ return 0; ++ else if (have_input(gpio, offset)) ++ return 1; ++ ++ return -ENOTSUPP; ++} ++ ++static inline int ++irqd_to_aspeed_sgpio_data(struct irq_data *d, struct aspeed_sgpio **gpio, ++ const struct aspeed_sgpio_bank **bank, ++ u32 *bit, int *offset) ++{ ++ struct aspeed_sgpio *internal; ++ ++ *offset = irqd_to_hwirq(d); ++ ++ internal = irq_data_get_irq_chip_data(d); ++ ++ *gpio = internal; ++ *bank = to_bank(*offset); ++ *bit = GPIO_BIT(*offset); ++ ++ return 0; ++} ++ ++static void aspeed_sgpio_irq_ack(struct irq_data *d) ++{ ++ const struct aspeed_sgpio_bank *bank; ++ struct aspeed_sgpio *gpio; ++ void __iomem *status_addr; ++ unsigned long flags; ++ int rc, offset; ++ u32 bit; ++ ++ rc = irqd_to_aspeed_sgpio_data(d, &gpio, &bank, &bit, &offset); ++ if (rc) ++ return; ++ ++ status_addr = bank_reg(gpio, bank, reg_irq_status); ++ ++ spin_lock_irqsave(&gpio->lock, flags); ++ ++ iowrite32(bit, status_addr); ++ ++ spin_unlock_irqrestore(&gpio->lock, flags); ++} ++ ++static void aspeed_sgpio_irq_set_mask(struct irq_data *d, bool set) ++{ ++ const struct aspeed_sgpio_bank *bank; ++ struct aspeed_sgpio *gpio; ++ unsigned long flags; ++ u32 reg, bit; ++ void __iomem *addr; ++ int rc, offset; ++ ++ rc = irqd_to_aspeed_sgpio_data(d, &gpio, &bank, &bit, &offset); ++ if (rc) ++ return; ++ ++ if (!bank->support_irq) ++ return; ++ ++ addr = bank_reg(gpio, bank, reg_irq_enable); ++ ++ spin_lock_irqsave(&gpio->lock, flags); ++ ++ reg = ioread32(addr); ++ if (set) ++ reg |= bit; ++ else ++ reg &= ~bit; ++ ++ iowrite32(reg, addr); ++ ++ spin_unlock_irqrestore(&gpio->lock, flags); ++} ++ ++static void aspeed_sgpio_irq_mask(struct irq_data *d) ++{ ++ aspeed_sgpio_irq_set_mask(d, false); ++} ++ ++static void aspeed_sgpio_irq_unmask(struct irq_data *d) ++{ ++ aspeed_sgpio_irq_set_mask(d, true); ++} ++ ++static int aspeed_sgpio_set_type(struct irq_data *d, unsigned int type) ++{ ++ u32 type0 = 0; ++ u32 type1 = 0; ++ u32 type2 = 0; ++ u32 bit, reg; ++ const struct aspeed_sgpio_bank *bank; ++ irq_flow_handler_t handler; ++ struct aspeed_sgpio *gpio; ++ unsigned long flags; ++ void __iomem *addr; ++ int rc, offset; ++ ++ rc = irqd_to_aspeed_sgpio_data(d, &gpio, &bank, &bit, &offset); ++ if (rc) ++ return -EINVAL; ++ ++ if (!bank->support_irq) ++ return -ENOTSUPP; ++ ++ switch (type & IRQ_TYPE_SENSE_MASK) { ++ case IRQ_TYPE_EDGE_BOTH: ++ type2 |= bit; ++ /* fall through */ ++ case IRQ_TYPE_EDGE_RISING: ++ type0 |= bit; ++ /* fall through */ ++ case IRQ_TYPE_EDGE_FALLING: ++ handler = handle_edge_irq; ++ break; ++ case IRQ_TYPE_LEVEL_HIGH: ++ type0 |= bit; ++ /* fall through */ ++ case IRQ_TYPE_LEVEL_LOW: ++ type1 |= bit; ++ handler = handle_level_irq; ++ break; ++ default: ++ return -EINVAL; ++ } ++ ++ spin_lock_irqsave(&gpio->lock, flags); ++ ++ addr = bank_reg(gpio, bank, reg_irq_type0); ++ reg = ioread32(addr); ++ reg = (reg & ~bit) | type0; ++ iowrite32(reg, addr); ++ ++ addr = bank_reg(gpio, bank, reg_irq_type1); ++ reg = ioread32(addr); ++ reg = (reg & ~bit) | type1; ++ iowrite32(reg, addr); ++ ++ addr = bank_reg(gpio, bank, reg_irq_type2); ++ reg = ioread32(addr); ++ reg = (reg & ~bit) | type2; ++ iowrite32(reg, addr); ++ ++ spin_unlock_irqrestore(&gpio->lock, flags); ++ ++ irq_set_handler_locked(d, handler); ++ ++ return 0; ++} ++ ++static void aspeed_sgpio_irq_handler(struct irq_desc *desc) ++{ ++ struct gpio_chip *gc = irq_desc_get_handler_data(desc); ++ struct aspeed_sgpio *data = gpiochip_get_data(gc); ++ struct irq_chip *ic = irq_desc_get_chip(desc); ++ unsigned int i, p, girq; ++ unsigned long reg; ++ ++ chained_irq_enter(ic, desc); ++ ++ for (i = 0; i < ARRAY_SIZE(aspeed_sgpio_banks); i++) { ++ const struct aspeed_sgpio_bank *bank = &aspeed_sgpio_banks[i]; ++ ++ if (!bank->support_irq) ++ continue; ++ ++ reg = ioread32(bank_reg(data, bank, reg_irq_status)); ++ ++ for_each_set_bit(p, ®, 32) { ++ girq = irq_find_mapping(gc->irq.domain, i * 32 + p); ++ generic_handle_irq(girq); ++ } ++ } ++ ++ chained_irq_exit(ic, desc); ++} ++ ++static void aspeed_sgpio_init_irq_valid_mask(struct gpio_chip *gc, ++ unsigned long *valid_mask, ++ unsigned int ngpios) ++{ ++ struct aspeed_sgpio *gpio = gpiochip_get_data(gc); ++ const struct aspeed_bank_props *props = gpio->config->props; ++ ++ while (!is_bank_props_sentinel(props)) { ++ unsigned int offset; ++ const unsigned long int input = props->input; ++ ++ /* Pretty crummy approach, but similar to GPIO core */ ++ for_each_clear_bit(offset, &input, 32) { ++ unsigned int i = props->bank * 32 + offset; ++ ++ if (i >= gpio->chip.ngpio) ++ break; ++ ++ clear_bit(i, valid_mask); ++ } ++ ++ props++; ++ } ++} ++ ++static int aspeed_sgpio_setup_irqs(struct aspeed_sgpio *gpio, ++ struct platform_device *pdev) ++{ ++ const struct aspeed_sgpio_bank *bank; ++ struct gpio_irq_chip *girq; ++ int rc, i; ++ ++ /* Initialize IRQ and tolerant settings */ ++ for (i = 0; i < ARRAY_SIZE(aspeed_sgpio_banks); i++) { ++ bank = &aspeed_sgpio_banks[i]; ++ ++ /* Value will be reset by WDT reset */ ++ iowrite32(0x00000000, bank_reg(gpio, bank, reg_tolerance)); ++ ++ if (!bank->support_irq) ++ continue; ++ ++ /* disable irq enable bits */ ++ iowrite32(0x00000000, bank_reg(gpio, bank, reg_irq_enable)); ++ /* clear status bits */ ++ iowrite32(0xffffffff, bank_reg(gpio, bank, reg_irq_status)); ++ /* set rising or level-high irq */ ++ iowrite32(0xffffffff, bank_reg(gpio, bank, reg_irq_type0)); ++ /* trigger type is level */ ++ iowrite32(0xffffffff, bank_reg(gpio, bank, reg_irq_type1)); ++ /* single trigger mode */ ++ iowrite32(0x00000000, bank_reg(gpio, bank, reg_irq_type2)); ++ } ++ ++ rc = platform_get_irq(pdev, 0); ++ if (rc < 0) ++ return rc; ++ ++ gpio->irq = rc; ++ girq = &gpio->chip.irq; ++ girq->chip = &gpio->irqc; ++ girq->chip->name = dev_name(&pdev->dev); ++ girq->chip->irq_ack = aspeed_sgpio_irq_ack; ++ girq->chip->irq_mask = aspeed_sgpio_irq_mask; ++ girq->chip->irq_unmask = aspeed_sgpio_irq_unmask; ++ girq->chip->irq_set_type = aspeed_sgpio_set_type; ++ girq->parent_handler = aspeed_sgpio_irq_handler; ++ girq->num_parents = 1; ++ girq->parents = devm_kcalloc(&pdev->dev, 1, ++ sizeof(*girq->parents), ++ GFP_KERNEL); ++ if (!girq->parents) ++ return -ENOMEM; ++ girq->parents[0] = gpio->irq; ++ girq->default_type = IRQ_TYPE_NONE; ++ girq->handler = handle_bad_irq; ++ girq->init_valid_mask = aspeed_sgpio_init_irq_valid_mask; ++ ++ return 0; ++} ++ ++static int aspeed_sgpio_reset_tolerance(struct gpio_chip *chip, ++ unsigned int offset, bool enable) ++{ ++ struct aspeed_sgpio *gpio = gpiochip_get_data(chip); ++ unsigned long flags; ++ void __iomem *treg; ++ u32 val; ++ ++ treg = bank_reg(gpio, to_bank(offset), reg_tolerance); ++ ++ spin_lock_irqsave(&gpio->lock, flags); ++ ++ val = readl(treg); ++ ++ if (enable) ++ val |= GPIO_BIT(offset); ++ else ++ val &= ~GPIO_BIT(offset); ++ ++ writel(val, treg); ++ ++ spin_unlock_irqrestore(&gpio->lock, flags); ++ ++ return 0; ++} ++ ++static int aspeed_sgpio_set_config(struct gpio_chip *chip, unsigned int offset, ++ unsigned long config) ++{ ++ unsigned long param = pinconf_to_config_param(config); ++ u32 arg = pinconf_to_config_argument(config); ++ ++ if (param == PIN_CONFIG_PERSIST_STATE) ++ return aspeed_sgpio_reset_tolerance(chip, offset, arg); ++ ++ return -ENOTSUPP; ++} ++ ++/* ++ * Any banks not specified in a struct aspeed_bank_props array are assumed to ++ * have the properties: ++ * ++ * { .input = 0xffffffff, .output = 0xffffffff } ++ */ ++ ++static const struct aspeed_bank_props ast_sgpio_bank_props[] = { ++ /* input output */ ++ { 0, 0x00000000, 0xffffffff }, /* OA/OB/OC/OD */ ++ { 1, 0x00000000, 0xffffffff }, /* OE/OF/OG/OH */ ++ { 2, 0x00000000, 0x0000ffff }, /* OI/OJ */ ++ { 3, 0xffffffff, 0x00000000 }, /* IA/IB/IC/ID */ ++ { 4, 0xffffffff, 0x00000000 }, /* IE/IF/IG/IH */ ++ { 5, 0x0000ffff, 0x00000000 }, /* II/IJ */ ++ { } ++}; ++ ++/* ++ * This H/W has 80 bidirectional lines so this driver provides total 160 lines ++ * for 80 outputs and 80 inputs. To simplify bank register manipulation, it ++ * uses 96 lines per each input and output set so total 192 lines it has. ++ */ ++static const struct aspeed_sgpio_config ast2400_config = ++ { .nr_pgpios = 224, .nr_gpios = 192, .props = ast_sgpio_bank_props }; ++ ++static const struct aspeed_sgpio_config ast2500_config = ++ { .nr_pgpios = 232, .nr_gpios = 192, .props = ast_sgpio_bank_props }; ++ ++static const struct of_device_id aspeed_sgpio_of_table[] = { ++ { .compatible = "aspeed,ast2400-sgpio", .data = &ast2400_config }, ++ { .compatible = "aspeed,ast2500-sgpio", .data = &ast2500_config }, ++ { } ++}; ++MODULE_DEVICE_TABLE(of, aspeed_sgpio_of_table); ++ ++static int __init aspeed_sgpio_probe(struct platform_device *pdev) ++{ ++ const struct of_device_id *gpio_id; ++ u32 sgpio_freq, clk_div, nb_gpios; ++ struct aspeed_sgpio *gpio; ++ unsigned long src_freq; ++ struct clk *clk; ++ int rc; ++ ++ gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL); ++ if (!gpio) ++ return -ENOMEM; ++ ++ gpio->base = devm_platform_ioremap_resource(pdev, 0); ++ if (IS_ERR(gpio->base)) ++ return PTR_ERR(gpio->base); ++ ++ spin_lock_init(&gpio->lock); ++ ++ gpio_id = of_match_node(aspeed_sgpio_of_table, pdev->dev.of_node); ++ if (!gpio_id) ++ return -EINVAL; ++ ++ gpio->config = gpio_id->data; ++ ++ rc = device_property_read_u32(&pdev->dev, "bus-frequency", &sgpio_freq); ++ if (rc < 0) { ++ dev_warn(&pdev->dev, "Could not read bus-frequency property. Use default.\n"); ++ sgpio_freq = ASPEED_SGPIO_BUS_FREQ_DEFAULT; ++ } ++ ++ clk = devm_clk_get(&pdev->dev, NULL); ++ if (IS_ERR(clk)) { ++ rc = PTR_ERR(clk); ++ if (rc != -EPROBE_DEFER) ++ dev_err(&pdev->dev, "Failed to get clk source.\n"); ++ return rc; ++ } ++ ++ /* ++ * There is a limitation that SGPIO clock division has to be larger or ++ * equal to 1. And a read back value of clock division is 1-bit left ++ * shifted from the actual value. ++ * ++ * GPIO254[31:16] - Serial GPIO clock division: ++ * Serial GPIO clock period = period of PCLK * 2 * (GPIO254[31:16] + 1) ++ * ++ * SGPIO master controller updates every data input when SGPMLD is low. ++ * For an example, SGPIO clock is 1MHz and number of SGPIO is 80. Each ++ * SGPIO will be updated every 80us. ++ */ ++ src_freq = clk_get_rate(clk); ++ clk_div = src_freq / (2 * sgpio_freq) - 1; ++ if (clk_div < ASPEED_SGPIO_CLK_DIV_MIN) ++ clk_div = ASPEED_SGPIO_CLK_DIV_MIN; ++ else if (clk_div > ASPEED_SGPIO_CLK_DIV_MAX) ++ clk_div = ASPEED_SGPIO_CLK_DIV_MAX; ++ ++ nb_gpios = gpio->config->nr_gpios / 16; ++ if (nb_gpios < ASPEED_SGPIO_PINBYTES_MIN) ++ nb_gpios = ASPEED_SGPIO_PINBYTES_MIN; ++ else if (nb_gpios > ASPEED_SGPIO_PINBYTES_MAX) ++ nb_gpios = ASPEED_SGPIO_PINBYTES_MAX; ++ ++ iowrite32(FIELD_PREP(ASPEED_SGPIO_CLK_DIV_MASK, clk_div) | ++ FIELD_PREP(ASPEED_SGPIO_PINBYTES_MASK, nb_gpios) | ++ ASPEED_SGPIO_ENABLE, ++ gpio->base + ASPEED_SGPIO_CTRL); ++ ++ gpio->chip.parent = &pdev->dev; ++ gpio->chip.ngpio = gpio->config->nr_gpios; ++ ++ gpio->chip.direction_input = aspeed_sgpio_dir_in; ++ gpio->chip.direction_output = aspeed_sgpio_dir_out; ++ gpio->chip.get_direction = aspeed_sgpio_get_direction; ++ gpio->chip.get = aspeed_sgpio_get; ++ gpio->chip.set = aspeed_sgpio_set; ++ gpio->chip.set_config = aspeed_sgpio_set_config; ++ gpio->chip.label = dev_name(&pdev->dev); ++ gpio->chip.base = -1; ++ ++ rc = aspeed_sgpio_setup_irqs(gpio, pdev); ++ if (rc < 0) ++ return rc; ++ ++ return devm_gpiochip_add_data(&pdev->dev, &gpio->chip, gpio); ++} ++ ++static struct platform_driver aspeed_sgpio_driver = { ++ .driver = { ++ .name = KBUILD_MODNAME, ++ .of_match_table = aspeed_sgpio_of_table, ++ }, ++}; ++ ++module_platform_driver_probe(aspeed_sgpio_driver, aspeed_sgpio_probe); ++ ++MODULE_AUTHOR("Jae Hyun Yoo <jae.hyun.yoo@linux.intel.com>"); ++MODULE_DESCRIPTION("Aspeed SGPIO Master Driver"); ++MODULE_LICENSE("GPL v2"); +-- +2.7.4 + |