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132 lines
3.8 KiB
132 lines
3.8 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* R-Car Gen1 RESET/WDT, R-Car Gen2, Gen3, and RZ/G RST Driver |
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* |
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* Copyright (C) 2016 Glider bvba |
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*/ |
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#include <linux/err.h> |
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#include <linux/io.h> |
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#include <linux/of_address.h> |
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#include <linux/soc/renesas/rcar-rst.h> |
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#define WDTRSTCR_RESET 0xA55A0002 |
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#define WDTRSTCR 0x0054 |
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static int rcar_rst_enable_wdt_reset(void __iomem *base) |
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{ |
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iowrite32(WDTRSTCR_RESET, base + WDTRSTCR); |
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return 0; |
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} |
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struct rst_config { |
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unsigned int modemr; /* Mode Monitoring Register Offset */ |
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int (*configure)(void __iomem *base); /* Platform specific config */ |
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}; |
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static const struct rst_config rcar_rst_gen1 __initconst = { |
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.modemr = 0x20, |
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}; |
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static const struct rst_config rcar_rst_gen2 __initconst = { |
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.modemr = 0x60, |
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.configure = rcar_rst_enable_wdt_reset, |
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}; |
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static const struct rst_config rcar_rst_gen3 __initconst = { |
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.modemr = 0x60, |
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}; |
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static const struct rst_config rcar_rst_r8a779a0 __initconst = { |
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.modemr = 0x00, /* MODEMR0 and it has CPG related bits */ |
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}; |
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static const struct of_device_id rcar_rst_matches[] __initconst = { |
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/* RZ/G1 is handled like R-Car Gen2 */ |
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{ .compatible = "renesas,r8a7742-rst", .data = &rcar_rst_gen2 }, |
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{ .compatible = "renesas,r8a7743-rst", .data = &rcar_rst_gen2 }, |
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{ .compatible = "renesas,r8a7744-rst", .data = &rcar_rst_gen2 }, |
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{ .compatible = "renesas,r8a7745-rst", .data = &rcar_rst_gen2 }, |
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{ .compatible = "renesas,r8a77470-rst", .data = &rcar_rst_gen2 }, |
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/* RZ/G2 is handled like R-Car Gen3 */ |
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{ .compatible = "renesas,r8a774a1-rst", .data = &rcar_rst_gen3 }, |
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{ .compatible = "renesas,r8a774b1-rst", .data = &rcar_rst_gen3 }, |
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{ .compatible = "renesas,r8a774c0-rst", .data = &rcar_rst_gen3 }, |
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{ .compatible = "renesas,r8a774e1-rst", .data = &rcar_rst_gen3 }, |
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/* R-Car Gen1 */ |
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{ .compatible = "renesas,r8a7778-reset-wdt", .data = &rcar_rst_gen1 }, |
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{ .compatible = "renesas,r8a7779-reset-wdt", .data = &rcar_rst_gen1 }, |
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/* R-Car Gen2 */ |
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{ .compatible = "renesas,r8a7790-rst", .data = &rcar_rst_gen2 }, |
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{ .compatible = "renesas,r8a7791-rst", .data = &rcar_rst_gen2 }, |
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{ .compatible = "renesas,r8a7792-rst", .data = &rcar_rst_gen2 }, |
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{ .compatible = "renesas,r8a7793-rst", .data = &rcar_rst_gen2 }, |
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{ .compatible = "renesas,r8a7794-rst", .data = &rcar_rst_gen2 }, |
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/* R-Car Gen3 */ |
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{ .compatible = "renesas,r8a7795-rst", .data = &rcar_rst_gen3 }, |
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{ .compatible = "renesas,r8a7796-rst", .data = &rcar_rst_gen3 }, |
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{ .compatible = "renesas,r8a77961-rst", .data = &rcar_rst_gen3 }, |
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{ .compatible = "renesas,r8a77965-rst", .data = &rcar_rst_gen3 }, |
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{ .compatible = "renesas,r8a77970-rst", .data = &rcar_rst_gen3 }, |
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{ .compatible = "renesas,r8a77980-rst", .data = &rcar_rst_gen3 }, |
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{ .compatible = "renesas,r8a77990-rst", .data = &rcar_rst_gen3 }, |
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{ .compatible = "renesas,r8a77995-rst", .data = &rcar_rst_gen3 }, |
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/* R-Car V3U */ |
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{ .compatible = "renesas,r8a779a0-rst", .data = &rcar_rst_r8a779a0 }, |
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{ /* sentinel */ } |
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}; |
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static void __iomem *rcar_rst_base __initdata; |
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static u32 saved_mode __initdata; |
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static int __init rcar_rst_init(void) |
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{ |
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const struct of_device_id *match; |
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const struct rst_config *cfg; |
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struct device_node *np; |
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void __iomem *base; |
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int error = 0; |
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np = of_find_matching_node_and_match(NULL, rcar_rst_matches, &match); |
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if (!np) |
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return -ENODEV; |
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base = of_iomap(np, 0); |
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if (!base) { |
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pr_warn("%pOF: Cannot map regs\n", np); |
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error = -ENOMEM; |
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goto out_put; |
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} |
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rcar_rst_base = base; |
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cfg = match->data; |
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saved_mode = ioread32(base + cfg->modemr); |
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if (cfg->configure) { |
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error = cfg->configure(base); |
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if (error) { |
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pr_warn("%pOF: Cannot run SoC specific configuration\n", |
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np); |
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goto out_put; |
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} |
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} |
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pr_debug("%pOF: MODE = 0x%08x\n", np, saved_mode); |
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out_put: |
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of_node_put(np); |
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return error; |
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} |
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int __init rcar_rst_read_mode_pins(u32 *mode) |
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{ |
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int error; |
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if (!rcar_rst_base) { |
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error = rcar_rst_init(); |
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if (error) |
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return error; |
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} |
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*mode = saved_mode; |
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return 0; |
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}
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