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424 lines
10 KiB
424 lines
10 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Copyright (c) 2015-2018, Intel Corporation. |
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*/ |
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#define pr_fmt(fmt) "aspeed-kcs-bmc: " fmt |
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#include <linux/atomic.h> |
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#include <linux/errno.h> |
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#include <linux/interrupt.h> |
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#include <linux/io.h> |
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#include <linux/mfd/syscon.h> |
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#include <linux/module.h> |
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#include <linux/of.h> |
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#include <linux/of_address.h> |
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#include <linux/platform_device.h> |
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#include <linux/poll.h> |
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#include <linux/regmap.h> |
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#include <linux/sched.h> |
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#include <linux/slab.h> |
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#include <linux/timer.h> |
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#include "kcs_bmc.h" |
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#define DEVICE_NAME "ast-kcs-bmc" |
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#define KCS_CHANNEL_MAX 4 |
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#define LPC_HICR0 0x000 |
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#define LPC_HICR0_LPC3E BIT(7) |
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#define LPC_HICR0_LPC2E BIT(6) |
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#define LPC_HICR0_LPC1E BIT(5) |
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#define LPC_HICR2 0x008 |
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#define LPC_HICR2_IBFIF3 BIT(3) |
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#define LPC_HICR2_IBFIF2 BIT(2) |
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#define LPC_HICR2_IBFIF1 BIT(1) |
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#define LPC_HICR4 0x010 |
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#define LPC_HICR4_LADR12AS BIT(7) |
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#define LPC_HICR4_KCSENBL BIT(2) |
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#define LPC_LADR3H 0x014 |
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#define LPC_LADR3L 0x018 |
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#define LPC_LADR12H 0x01C |
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#define LPC_LADR12L 0x020 |
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#define LPC_IDR1 0x024 |
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#define LPC_IDR2 0x028 |
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#define LPC_IDR3 0x02C |
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#define LPC_ODR1 0x030 |
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#define LPC_ODR2 0x034 |
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#define LPC_ODR3 0x038 |
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#define LPC_STR1 0x03C |
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#define LPC_STR2 0x040 |
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#define LPC_STR3 0x044 |
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#define LPC_HICRB 0x100 |
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#define LPC_HICRB_IBFIF4 BIT(1) |
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#define LPC_HICRB_LPC4E BIT(0) |
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#define LPC_LADR4 0x110 |
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#define LPC_IDR4 0x114 |
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#define LPC_ODR4 0x118 |
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#define LPC_STR4 0x11C |
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struct aspeed_kcs_bmc { |
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struct regmap *map; |
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}; |
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static u8 aspeed_kcs_inb(struct kcs_bmc *kcs_bmc, u32 reg) |
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{ |
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struct aspeed_kcs_bmc *priv = kcs_bmc_priv(kcs_bmc); |
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u32 val = 0; |
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int rc; |
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rc = regmap_read(priv->map, reg, &val); |
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WARN(rc != 0, "regmap_read() failed: %d\n", rc); |
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return rc == 0 ? (u8) val : 0; |
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} |
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static void aspeed_kcs_outb(struct kcs_bmc *kcs_bmc, u32 reg, u8 data) |
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{ |
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struct aspeed_kcs_bmc *priv = kcs_bmc_priv(kcs_bmc); |
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int rc; |
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rc = regmap_write(priv->map, reg, data); |
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WARN(rc != 0, "regmap_write() failed: %d\n", rc); |
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} |
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/* |
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* AST_usrGuide_KCS.pdf |
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* 2. Background: |
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* we note D for Data, and C for Cmd/Status, default rules are |
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* A. KCS1 / KCS2 ( D / C:X / X+4 ) |
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* D / C : CA0h / CA4h |
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* D / C : CA8h / CACh |
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* B. KCS3 ( D / C:XX2h / XX3h ) |
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* D / C : CA2h / CA3h |
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* D / C : CB2h / CB3h |
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* C. KCS4 |
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* D / C : CA4h / CA5h |
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*/ |
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static void aspeed_kcs_set_address(struct kcs_bmc *kcs_bmc, u16 addr) |
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{ |
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struct aspeed_kcs_bmc *priv = kcs_bmc_priv(kcs_bmc); |
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switch (kcs_bmc->channel) { |
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case 1: |
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regmap_update_bits(priv->map, LPC_HICR4, |
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LPC_HICR4_LADR12AS, 0); |
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regmap_write(priv->map, LPC_LADR12H, addr >> 8); |
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regmap_write(priv->map, LPC_LADR12L, addr & 0xFF); |
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break; |
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case 2: |
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regmap_update_bits(priv->map, LPC_HICR4, |
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LPC_HICR4_LADR12AS, LPC_HICR4_LADR12AS); |
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regmap_write(priv->map, LPC_LADR12H, addr >> 8); |
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regmap_write(priv->map, LPC_LADR12L, addr & 0xFF); |
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break; |
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case 3: |
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regmap_write(priv->map, LPC_LADR3H, addr >> 8); |
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regmap_write(priv->map, LPC_LADR3L, addr & 0xFF); |
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break; |
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case 4: |
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regmap_write(priv->map, LPC_LADR4, ((addr + 1) << 16) | |
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addr); |
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break; |
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default: |
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break; |
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} |
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} |
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static void aspeed_kcs_enable_channel(struct kcs_bmc *kcs_bmc, bool enable) |
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{ |
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struct aspeed_kcs_bmc *priv = kcs_bmc_priv(kcs_bmc); |
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switch (kcs_bmc->channel) { |
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case 1: |
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if (enable) { |
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regmap_update_bits(priv->map, LPC_HICR2, |
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LPC_HICR2_IBFIF1, LPC_HICR2_IBFIF1); |
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regmap_update_bits(priv->map, LPC_HICR0, |
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LPC_HICR0_LPC1E, LPC_HICR0_LPC1E); |
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} else { |
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regmap_update_bits(priv->map, LPC_HICR0, |
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LPC_HICR0_LPC1E, 0); |
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regmap_update_bits(priv->map, LPC_HICR2, |
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LPC_HICR2_IBFIF1, 0); |
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} |
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break; |
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case 2: |
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if (enable) { |
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regmap_update_bits(priv->map, LPC_HICR2, |
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LPC_HICR2_IBFIF2, LPC_HICR2_IBFIF2); |
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regmap_update_bits(priv->map, LPC_HICR0, |
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LPC_HICR0_LPC2E, LPC_HICR0_LPC2E); |
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} else { |
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regmap_update_bits(priv->map, LPC_HICR0, |
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LPC_HICR0_LPC2E, 0); |
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regmap_update_bits(priv->map, LPC_HICR2, |
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LPC_HICR2_IBFIF2, 0); |
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} |
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break; |
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case 3: |
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if (enable) { |
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regmap_update_bits(priv->map, LPC_HICR2, |
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LPC_HICR2_IBFIF3, LPC_HICR2_IBFIF3); |
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regmap_update_bits(priv->map, LPC_HICR0, |
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LPC_HICR0_LPC3E, LPC_HICR0_LPC3E); |
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regmap_update_bits(priv->map, LPC_HICR4, |
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LPC_HICR4_KCSENBL, LPC_HICR4_KCSENBL); |
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} else { |
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regmap_update_bits(priv->map, LPC_HICR0, |
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LPC_HICR0_LPC3E, 0); |
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regmap_update_bits(priv->map, LPC_HICR4, |
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LPC_HICR4_KCSENBL, 0); |
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regmap_update_bits(priv->map, LPC_HICR2, |
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LPC_HICR2_IBFIF3, 0); |
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} |
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break; |
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case 4: |
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if (enable) |
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regmap_update_bits(priv->map, LPC_HICRB, |
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LPC_HICRB_IBFIF4 | LPC_HICRB_LPC4E, |
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LPC_HICRB_IBFIF4 | LPC_HICRB_LPC4E); |
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else |
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regmap_update_bits(priv->map, LPC_HICRB, |
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LPC_HICRB_IBFIF4 | LPC_HICRB_LPC4E, |
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0); |
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break; |
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default: |
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break; |
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} |
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} |
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static irqreturn_t aspeed_kcs_irq(int irq, void *arg) |
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{ |
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struct kcs_bmc *kcs_bmc = arg; |
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if (!kcs_bmc_handle_event(kcs_bmc)) |
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return IRQ_HANDLED; |
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return IRQ_NONE; |
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} |
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static int aspeed_kcs_config_irq(struct kcs_bmc *kcs_bmc, |
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struct platform_device *pdev) |
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{ |
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struct device *dev = &pdev->dev; |
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int irq; |
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irq = platform_get_irq(pdev, 0); |
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if (irq < 0) |
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return irq; |
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return devm_request_irq(dev, irq, aspeed_kcs_irq, IRQF_SHARED, |
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dev_name(dev), kcs_bmc); |
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} |
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static const struct kcs_ioreg ast_kcs_bmc_ioregs[KCS_CHANNEL_MAX] = { |
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{ .idr = LPC_IDR1, .odr = LPC_ODR1, .str = LPC_STR1 }, |
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{ .idr = LPC_IDR2, .odr = LPC_ODR2, .str = LPC_STR2 }, |
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{ .idr = LPC_IDR3, .odr = LPC_ODR3, .str = LPC_STR3 }, |
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{ .idr = LPC_IDR4, .odr = LPC_ODR4, .str = LPC_STR4 }, |
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}; |
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static struct kcs_bmc *aspeed_kcs_probe_of_v1(struct platform_device *pdev) |
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{ |
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struct aspeed_kcs_bmc *priv; |
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struct device_node *np; |
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struct kcs_bmc *kcs; |
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u32 channel; |
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u32 slave; |
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int rc; |
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np = pdev->dev.of_node; |
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rc = of_property_read_u32(np, "kcs_chan", &channel); |
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if ((rc != 0) || (channel == 0 || channel > KCS_CHANNEL_MAX)) { |
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dev_err(&pdev->dev, "no valid 'kcs_chan' configured\n"); |
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return ERR_PTR(-EINVAL); |
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} |
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kcs = kcs_bmc_alloc(&pdev->dev, sizeof(struct aspeed_kcs_bmc), channel); |
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if (!kcs) |
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return ERR_PTR(-ENOMEM); |
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priv = kcs_bmc_priv(kcs); |
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priv->map = syscon_node_to_regmap(pdev->dev.parent->of_node); |
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if (IS_ERR(priv->map)) { |
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dev_err(&pdev->dev, "Couldn't get regmap\n"); |
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return ERR_PTR(-ENODEV); |
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} |
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rc = of_property_read_u32(np, "kcs_addr", &slave); |
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if (rc) { |
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dev_err(&pdev->dev, "no valid 'kcs_addr' configured\n"); |
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return ERR_PTR(-EINVAL); |
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} |
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kcs->ioreg = ast_kcs_bmc_ioregs[channel - 1]; |
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aspeed_kcs_set_address(kcs, slave); |
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return kcs; |
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} |
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static int aspeed_kcs_calculate_channel(const struct kcs_ioreg *regs) |
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{ |
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int i; |
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for (i = 0; i < ARRAY_SIZE(ast_kcs_bmc_ioregs); i++) { |
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if (!memcmp(&ast_kcs_bmc_ioregs[i], regs, sizeof(*regs))) |
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return i + 1; |
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} |
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return -EINVAL; |
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} |
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static struct kcs_bmc *aspeed_kcs_probe_of_v2(struct platform_device *pdev) |
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{ |
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struct aspeed_kcs_bmc *priv; |
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struct device_node *np; |
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struct kcs_ioreg ioreg; |
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struct kcs_bmc *kcs; |
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const __be32 *reg; |
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int channel; |
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u32 slave; |
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int rc; |
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np = pdev->dev.of_node; |
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/* Don't translate addresses, we want offsets for the regmaps */ |
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reg = of_get_address(np, 0, NULL, NULL); |
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if (!reg) |
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return ERR_PTR(-EINVAL); |
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ioreg.idr = be32_to_cpup(reg); |
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reg = of_get_address(np, 1, NULL, NULL); |
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if (!reg) |
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return ERR_PTR(-EINVAL); |
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ioreg.odr = be32_to_cpup(reg); |
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reg = of_get_address(np, 2, NULL, NULL); |
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if (!reg) |
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return ERR_PTR(-EINVAL); |
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ioreg.str = be32_to_cpup(reg); |
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channel = aspeed_kcs_calculate_channel(&ioreg); |
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if (channel < 0) |
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return ERR_PTR(channel); |
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kcs = kcs_bmc_alloc(&pdev->dev, sizeof(struct aspeed_kcs_bmc), channel); |
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if (!kcs) |
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return ERR_PTR(-ENOMEM); |
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kcs->ioreg = ioreg; |
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priv = kcs_bmc_priv(kcs); |
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priv->map = syscon_node_to_regmap(pdev->dev.parent->of_node); |
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if (IS_ERR(priv->map)) { |
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dev_err(&pdev->dev, "Couldn't get regmap\n"); |
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return ERR_PTR(-ENODEV); |
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} |
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rc = of_property_read_u32(np, "aspeed,lpc-io-reg", &slave); |
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if (rc) |
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return ERR_PTR(rc); |
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aspeed_kcs_set_address(kcs, slave); |
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return kcs; |
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} |
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static int aspeed_kcs_probe(struct platform_device *pdev) |
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{ |
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struct device *dev = &pdev->dev; |
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struct kcs_bmc *kcs_bmc; |
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struct device_node *np; |
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int rc; |
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np = dev->of_node->parent; |
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if (!of_device_is_compatible(np, "aspeed,ast2400-lpc-v2") && |
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!of_device_is_compatible(np, "aspeed,ast2500-lpc-v2") && |
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!of_device_is_compatible(np, "aspeed,ast2600-lpc-v2")) { |
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dev_err(dev, "unsupported LPC device binding\n"); |
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return -ENODEV; |
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} |
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np = dev->of_node; |
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if (of_device_is_compatible(np, "aspeed,ast2400-kcs-bmc") || |
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of_device_is_compatible(np, "aspeed,ast2500-kcs-bmc")) |
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kcs_bmc = aspeed_kcs_probe_of_v1(pdev); |
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else if (of_device_is_compatible(np, "aspeed,ast2400-kcs-bmc-v2") || |
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of_device_is_compatible(np, "aspeed,ast2500-kcs-bmc-v2")) |
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kcs_bmc = aspeed_kcs_probe_of_v2(pdev); |
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else |
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return -EINVAL; |
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if (IS_ERR(kcs_bmc)) |
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return PTR_ERR(kcs_bmc); |
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kcs_bmc->io_inputb = aspeed_kcs_inb; |
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kcs_bmc->io_outputb = aspeed_kcs_outb; |
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rc = aspeed_kcs_config_irq(kcs_bmc, pdev); |
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if (rc) |
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return rc; |
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dev_set_drvdata(dev, kcs_bmc); |
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aspeed_kcs_enable_channel(kcs_bmc, true); |
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rc = misc_register(&kcs_bmc->miscdev); |
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if (rc) { |
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dev_err(dev, "Unable to register device\n"); |
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return rc; |
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} |
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dev_dbg(&pdev->dev, |
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"Probed KCS device %d (IDR=0x%x, ODR=0x%x, STR=0x%x)\n", |
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kcs_bmc->channel, kcs_bmc->ioreg.idr, kcs_bmc->ioreg.odr, |
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kcs_bmc->ioreg.str); |
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return 0; |
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} |
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static int aspeed_kcs_remove(struct platform_device *pdev) |
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{ |
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struct kcs_bmc *kcs_bmc = dev_get_drvdata(&pdev->dev); |
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misc_deregister(&kcs_bmc->miscdev); |
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return 0; |
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} |
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static const struct of_device_id ast_kcs_bmc_match[] = { |
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{ .compatible = "aspeed,ast2400-kcs-bmc" }, |
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{ .compatible = "aspeed,ast2500-kcs-bmc" }, |
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{ .compatible = "aspeed,ast2400-kcs-bmc-v2" }, |
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{ .compatible = "aspeed,ast2500-kcs-bmc-v2" }, |
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{ } |
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}; |
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MODULE_DEVICE_TABLE(of, ast_kcs_bmc_match); |
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static struct platform_driver ast_kcs_bmc_driver = { |
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.driver = { |
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.name = DEVICE_NAME, |
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.of_match_table = ast_kcs_bmc_match, |
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}, |
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.probe = aspeed_kcs_probe, |
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.remove = aspeed_kcs_remove, |
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}; |
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module_platform_driver(ast_kcs_bmc_driver); |
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MODULE_LICENSE("GPL v2"); |
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MODULE_AUTHOR("Haiyue Wang <[email protected]>"); |
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MODULE_DESCRIPTION("Aspeed device interface to the KCS BMC device");
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