321 lines
7.9 KiB
C
321 lines
7.9 KiB
C
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// 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/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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/* mapped to lpc-bmc@0 IO space */
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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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/* mapped to lpc-host@80 IO space */
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#define LPC_HICRB 0x080
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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 0x090
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#define LPC_IDR4 0x094
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#define LPC_ODR4 0x098
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#define LPC_STR4 0x09C
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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 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 aspeed_kcs_bmc *priv;
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struct kcs_bmc *kcs_bmc;
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u32 chan, addr;
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int rc;
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rc = of_property_read_u32(dev->of_node, "kcs_chan", &chan);
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if ((rc != 0) || (chan == 0 || chan > KCS_CHANNEL_MAX)) {
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dev_err(dev, "no valid 'kcs_chan' configured\n");
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return -ENODEV;
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}
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rc = of_property_read_u32(dev->of_node, "kcs_addr", &addr);
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if (rc) {
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dev_err(dev, "no valid 'kcs_addr' configured\n");
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return -ENODEV;
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}
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kcs_bmc = kcs_bmc_alloc(dev, sizeof(*priv), chan);
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if (!kcs_bmc)
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return -ENOMEM;
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priv = kcs_bmc_priv(kcs_bmc);
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priv->map = syscon_node_to_regmap(dev->parent->of_node);
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if (IS_ERR(priv->map)) {
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dev_err(dev, "Couldn't get regmap\n");
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return -ENODEV;
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}
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kcs_bmc->ioreg = ast_kcs_bmc_ioregs[chan - 1];
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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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dev_set_drvdata(dev, kcs_bmc);
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aspeed_kcs_set_address(kcs_bmc, addr);
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aspeed_kcs_enable_channel(kcs_bmc, true);
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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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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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pr_info("channel=%u addr=0x%x idr=0x%x odr=0x%x str=0x%x\n",
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chan, addr,
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kcs_bmc->ioreg.idr, kcs_bmc->ioreg.odr, 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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{ }
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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 <haiyue.wang@linux.intel.com>");
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MODULE_DESCRIPTION("Aspeed device interface to the KCS BMC device");
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