![Wolfram Sang](/assets/img/avatar_default.png)
A platform_driver does not need to set an owner, it will be populated by the driver core. Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
241 lines
6.5 KiB
C
241 lines
6.5 KiB
C
/*
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* Copyright (c) 2014 Tomasz Figa <t.figa@samsung.com>
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*
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* Based on Exynos Audio Subsystem Clock Controller driver:
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*
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* Copyright (c) 2013 Samsung Electronics Co., Ltd.
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* Author: Padmavathi Venna <padma.v@samsung.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Driver for Audio Subsystem Clock Controller of S5PV210-compatible SoCs.
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*/
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#include <linux/clkdev.h>
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#include <linux/io.h>
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#include <linux/clk-provider.h>
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#include <linux/of_address.h>
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#include <linux/syscore_ops.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <dt-bindings/clock/s5pv210-audss.h>
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static DEFINE_SPINLOCK(lock);
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static struct clk **clk_table;
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static void __iomem *reg_base;
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static struct clk_onecell_data clk_data;
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#define ASS_CLK_SRC 0x0
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#define ASS_CLK_DIV 0x4
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#define ASS_CLK_GATE 0x8
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#ifdef CONFIG_PM_SLEEP
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static unsigned long reg_save[][2] = {
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{ASS_CLK_SRC, 0},
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{ASS_CLK_DIV, 0},
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{ASS_CLK_GATE, 0},
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};
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static int s5pv210_audss_clk_suspend(void)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(reg_save); i++)
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reg_save[i][1] = readl(reg_base + reg_save[i][0]);
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return 0;
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}
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static void s5pv210_audss_clk_resume(void)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(reg_save); i++)
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writel(reg_save[i][1], reg_base + reg_save[i][0]);
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}
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static struct syscore_ops s5pv210_audss_clk_syscore_ops = {
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.suspend = s5pv210_audss_clk_suspend,
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.resume = s5pv210_audss_clk_resume,
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};
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#endif /* CONFIG_PM_SLEEP */
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/* register s5pv210_audss clocks */
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static int s5pv210_audss_clk_probe(struct platform_device *pdev)
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{
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int i, ret = 0;
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struct resource *res;
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const char *mout_audss_p[2];
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const char *mout_i2s_p[3];
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const char *hclk_p;
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struct clk *hclk, *pll_ref, *pll_in, *cdclk, *sclk_audio;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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reg_base = devm_ioremap_resource(&pdev->dev, res);
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if (IS_ERR(reg_base)) {
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dev_err(&pdev->dev, "failed to map audss registers\n");
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return PTR_ERR(reg_base);
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}
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clk_table = devm_kzalloc(&pdev->dev,
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sizeof(struct clk *) * AUDSS_MAX_CLKS,
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GFP_KERNEL);
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if (!clk_table)
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return -ENOMEM;
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clk_data.clks = clk_table;
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clk_data.clk_num = AUDSS_MAX_CLKS;
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hclk = devm_clk_get(&pdev->dev, "hclk");
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if (IS_ERR(hclk)) {
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dev_err(&pdev->dev, "failed to get hclk clock\n");
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return PTR_ERR(hclk);
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}
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pll_in = devm_clk_get(&pdev->dev, "fout_epll");
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if (IS_ERR(pll_in)) {
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dev_err(&pdev->dev, "failed to get fout_epll clock\n");
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return PTR_ERR(pll_in);
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}
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sclk_audio = devm_clk_get(&pdev->dev, "sclk_audio0");
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if (IS_ERR(sclk_audio)) {
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dev_err(&pdev->dev, "failed to get sclk_audio0 clock\n");
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return PTR_ERR(sclk_audio);
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}
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/* iiscdclk0 is an optional external I2S codec clock */
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cdclk = devm_clk_get(&pdev->dev, "iiscdclk0");
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pll_ref = devm_clk_get(&pdev->dev, "xxti");
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if (!IS_ERR(pll_ref))
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mout_audss_p[0] = __clk_get_name(pll_ref);
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else
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mout_audss_p[0] = "xxti";
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mout_audss_p[1] = __clk_get_name(pll_in);
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clk_table[CLK_MOUT_AUDSS] = clk_register_mux(NULL, "mout_audss",
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mout_audss_p, ARRAY_SIZE(mout_audss_p),
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CLK_SET_RATE_NO_REPARENT,
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reg_base + ASS_CLK_SRC, 0, 1, 0, &lock);
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mout_i2s_p[0] = "mout_audss";
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if (!IS_ERR(cdclk))
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mout_i2s_p[1] = __clk_get_name(cdclk);
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else
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mout_i2s_p[1] = "iiscdclk0";
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mout_i2s_p[2] = __clk_get_name(sclk_audio);
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clk_table[CLK_MOUT_I2S_A] = clk_register_mux(NULL, "mout_i2s_audss",
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mout_i2s_p, ARRAY_SIZE(mout_i2s_p),
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CLK_SET_RATE_NO_REPARENT,
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reg_base + ASS_CLK_SRC, 2, 2, 0, &lock);
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clk_table[CLK_DOUT_AUD_BUS] = clk_register_divider(NULL,
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"dout_aud_bus", "mout_audss", 0,
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reg_base + ASS_CLK_DIV, 0, 4, 0, &lock);
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clk_table[CLK_DOUT_I2S_A] = clk_register_divider(NULL, "dout_i2s_audss",
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"mout_i2s_audss", 0, reg_base + ASS_CLK_DIV,
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4, 4, 0, &lock);
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clk_table[CLK_I2S] = clk_register_gate(NULL, "i2s_audss",
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"dout_i2s_audss", CLK_SET_RATE_PARENT,
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reg_base + ASS_CLK_GATE, 6, 0, &lock);
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hclk_p = __clk_get_name(hclk);
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clk_table[CLK_HCLK_I2S] = clk_register_gate(NULL, "hclk_i2s_audss",
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hclk_p, CLK_IGNORE_UNUSED,
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reg_base + ASS_CLK_GATE, 5, 0, &lock);
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clk_table[CLK_HCLK_UART] = clk_register_gate(NULL, "hclk_uart_audss",
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hclk_p, CLK_IGNORE_UNUSED,
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reg_base + ASS_CLK_GATE, 4, 0, &lock);
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clk_table[CLK_HCLK_HWA] = clk_register_gate(NULL, "hclk_hwa_audss",
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hclk_p, CLK_IGNORE_UNUSED,
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reg_base + ASS_CLK_GATE, 3, 0, &lock);
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clk_table[CLK_HCLK_DMA] = clk_register_gate(NULL, "hclk_dma_audss",
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hclk_p, CLK_IGNORE_UNUSED,
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reg_base + ASS_CLK_GATE, 2, 0, &lock);
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clk_table[CLK_HCLK_BUF] = clk_register_gate(NULL, "hclk_buf_audss",
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hclk_p, CLK_IGNORE_UNUSED,
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reg_base + ASS_CLK_GATE, 1, 0, &lock);
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clk_table[CLK_HCLK_RP] = clk_register_gate(NULL, "hclk_rp_audss",
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hclk_p, CLK_IGNORE_UNUSED,
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reg_base + ASS_CLK_GATE, 0, 0, &lock);
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for (i = 0; i < clk_data.clk_num; i++) {
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if (IS_ERR(clk_table[i])) {
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dev_err(&pdev->dev, "failed to register clock %d\n", i);
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ret = PTR_ERR(clk_table[i]);
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goto unregister;
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}
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}
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ret = of_clk_add_provider(pdev->dev.of_node, of_clk_src_onecell_get,
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&clk_data);
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if (ret) {
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dev_err(&pdev->dev, "failed to add clock provider\n");
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goto unregister;
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}
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#ifdef CONFIG_PM_SLEEP
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register_syscore_ops(&s5pv210_audss_clk_syscore_ops);
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#endif
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return 0;
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unregister:
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for (i = 0; i < clk_data.clk_num; i++) {
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if (!IS_ERR(clk_table[i]))
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clk_unregister(clk_table[i]);
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}
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return ret;
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}
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static int s5pv210_audss_clk_remove(struct platform_device *pdev)
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{
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int i;
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of_clk_del_provider(pdev->dev.of_node);
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for (i = 0; i < clk_data.clk_num; i++) {
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if (!IS_ERR(clk_table[i]))
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clk_unregister(clk_table[i]);
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}
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return 0;
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}
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static const struct of_device_id s5pv210_audss_clk_of_match[] = {
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{ .compatible = "samsung,s5pv210-audss-clock", },
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{},
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};
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static struct platform_driver s5pv210_audss_clk_driver = {
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.driver = {
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.name = "s5pv210-audss-clk",
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.of_match_table = s5pv210_audss_clk_of_match,
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},
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.probe = s5pv210_audss_clk_probe,
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.remove = s5pv210_audss_clk_remove,
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};
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static int __init s5pv210_audss_clk_init(void)
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{
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return platform_driver_register(&s5pv210_audss_clk_driver);
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}
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core_initcall(s5pv210_audss_clk_init);
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static void __exit s5pv210_audss_clk_exit(void)
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{
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platform_driver_unregister(&s5pv210_audss_clk_driver);
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}
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module_exit(s5pv210_audss_clk_exit);
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MODULE_AUTHOR("Tomasz Figa <t.figa@samsung.com>");
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MODULE_DESCRIPTION("S5PV210 Audio Subsystem Clock Controller");
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MODULE_LICENSE("GPL v2");
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MODULE_ALIAS("platform:s5pv210-audss-clk");
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