diff options
Diffstat (limited to 'drivers/clk/mvebu/ap806-system-controller.c')
| -rw-r--r-- | drivers/clk/mvebu/ap806-system-controller.c | 294 |
1 files changed, 294 insertions, 0 deletions
diff --git a/drivers/clk/mvebu/ap806-system-controller.c b/drivers/clk/mvebu/ap806-system-controller.c new file mode 100644 index 000000000..948bd1e71 --- /dev/null +++ b/drivers/clk/mvebu/ap806-system-controller.c @@ -0,0 +1,294 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Marvell Armada AP806 System Controller + * + * Copyright (C) 2016 Marvell + * + * Thomas Petazzoni <thomas.petazzoni@free-electrons.com> + * + */ + +#define pr_fmt(fmt) "ap806-system-controller: " fmt + +#include "armada_ap_cp_helper.h" +#include <linux/clk-provider.h> +#include <linux/mfd/syscon.h> +#include <linux/init.h> +#include <linux/of.h> +#include <linux/platform_device.h> +#include <linux/regmap.h> + +#define AP806_SAR_REG 0x400 +#define AP806_SAR_CLKFREQ_MODE_MASK 0x1f + +#define AP806_CLK_NUM 6 + +static struct clk *ap806_clks[AP806_CLK_NUM]; + +static struct clk_onecell_data ap806_clk_data = { + .clks = ap806_clks, + .clk_num = AP806_CLK_NUM, +}; + +static int ap806_get_sar_clocks(unsigned int freq_mode, + unsigned int *cpuclk_freq, + unsigned int *dclk_freq) +{ + switch (freq_mode) { + case 0x0: + *cpuclk_freq = 2000; + *dclk_freq = 600; + break; + case 0x1: + *cpuclk_freq = 2000; + *dclk_freq = 525; + break; + case 0x6: + *cpuclk_freq = 1800; + *dclk_freq = 600; + break; + case 0x7: + *cpuclk_freq = 1800; + *dclk_freq = 525; + break; + case 0x4: + *cpuclk_freq = 1600; + *dclk_freq = 400; + break; + case 0xB: + *cpuclk_freq = 1600; + *dclk_freq = 450; + break; + case 0xD: + *cpuclk_freq = 1600; + *dclk_freq = 525; + break; + case 0x1a: + *cpuclk_freq = 1400; + *dclk_freq = 400; + break; + case 0x14: + *cpuclk_freq = 1300; + *dclk_freq = 400; + break; + case 0x17: + *cpuclk_freq = 1300; + *dclk_freq = 325; + break; + case 0x19: + *cpuclk_freq = 1200; + *dclk_freq = 400; + break; + case 0x13: + *cpuclk_freq = 1000; + *dclk_freq = 325; + break; + case 0x1d: + *cpuclk_freq = 1000; + *dclk_freq = 400; + break; + case 0x1c: + *cpuclk_freq = 800; + *dclk_freq = 400; + break; + case 0x1b: + *cpuclk_freq = 600; + *dclk_freq = 400; + break; + default: + return -EINVAL; + } + + return 0; +} + +static int ap807_get_sar_clocks(unsigned int freq_mode, + unsigned int *cpuclk_freq, + unsigned int *dclk_freq) +{ + switch (freq_mode) { + case 0x0: + *cpuclk_freq = 2000; + *dclk_freq = 1200; + break; + case 0x6: + *cpuclk_freq = 2200; + *dclk_freq = 1200; + break; + case 0xD: + *cpuclk_freq = 1600; + *dclk_freq = 1200; + break; + default: + return -EINVAL; + } + + return 0; +} + +static int ap806_syscon_common_probe(struct platform_device *pdev, + struct device_node *syscon_node) +{ + unsigned int freq_mode, cpuclk_freq, dclk_freq; + const char *name, *fixedclk_name; + struct device *dev = &pdev->dev; + struct device_node *np = dev->of_node; + struct regmap *regmap; + u32 reg; + int ret; + + regmap = syscon_node_to_regmap(syscon_node); + if (IS_ERR(regmap)) { + dev_err(dev, "cannot get regmap\n"); + return PTR_ERR(regmap); + } + + ret = regmap_read(regmap, AP806_SAR_REG, ®); + if (ret) { + dev_err(dev, "cannot read from regmap\n"); + return ret; + } + + freq_mode = reg & AP806_SAR_CLKFREQ_MODE_MASK; + + if (of_device_is_compatible(pdev->dev.of_node, + "marvell,ap806-clock")) { + ret = ap806_get_sar_clocks(freq_mode, &cpuclk_freq, &dclk_freq); + } else if (of_device_is_compatible(pdev->dev.of_node, + "marvell,ap807-clock")) { + ret = ap807_get_sar_clocks(freq_mode, &cpuclk_freq, &dclk_freq); + } else { + dev_err(dev, "compatible not supported\n"); + return -EINVAL; + } + + if (ret) { + dev_err(dev, "invalid Sample at Reset value\n"); + return ret; + } + + /* Convert to hertz */ + cpuclk_freq *= 1000 * 1000; + dclk_freq *= 1000 * 1000; + + /* CPU clocks depend on the Sample At Reset configuration */ + name = ap_cp_unique_name(dev, syscon_node, "pll-cluster-0"); + ap806_clks[0] = clk_register_fixed_rate(dev, name, NULL, + 0, cpuclk_freq); + if (IS_ERR(ap806_clks[0])) { + ret = PTR_ERR(ap806_clks[0]); + goto fail0; + } + + name = ap_cp_unique_name(dev, syscon_node, "pll-cluster-1"); + ap806_clks[1] = clk_register_fixed_rate(dev, name, NULL, 0, + cpuclk_freq); + if (IS_ERR(ap806_clks[1])) { + ret = PTR_ERR(ap806_clks[1]); + goto fail1; + } + + /* Fixed clock is always 1200 Mhz */ + fixedclk_name = ap_cp_unique_name(dev, syscon_node, "fixed"); + ap806_clks[2] = clk_register_fixed_rate(dev, fixedclk_name, NULL, + 0, 1200 * 1000 * 1000); + if (IS_ERR(ap806_clks[2])) { + ret = PTR_ERR(ap806_clks[2]); + goto fail2; + } + + /* MSS Clock is fixed clock divided by 6 */ + name = ap_cp_unique_name(dev, syscon_node, "mss"); + ap806_clks[3] = clk_register_fixed_factor(NULL, name, fixedclk_name, + 0, 1, 6); + if (IS_ERR(ap806_clks[3])) { + ret = PTR_ERR(ap806_clks[3]); + goto fail3; + } + + /* SDIO(/eMMC) Clock is fixed clock divided by 3 */ + name = ap_cp_unique_name(dev, syscon_node, "sdio"); + ap806_clks[4] = clk_register_fixed_factor(NULL, name, + fixedclk_name, + 0, 1, 3); + if (IS_ERR(ap806_clks[4])) { + ret = PTR_ERR(ap806_clks[4]); + goto fail4; + } + + /* AP-DCLK(HCLK) Clock is DDR clock divided by 2 */ + name = ap_cp_unique_name(dev, syscon_node, "ap-dclk"); + ap806_clks[5] = clk_register_fixed_rate(dev, name, NULL, 0, dclk_freq); + if (IS_ERR(ap806_clks[5])) { + ret = PTR_ERR(ap806_clks[5]); + goto fail5; + } + + ret = of_clk_add_provider(np, of_clk_src_onecell_get, &ap806_clk_data); + if (ret) + goto fail_clk_add; + + return 0; + +fail_clk_add: + clk_unregister_fixed_factor(ap806_clks[5]); +fail5: + clk_unregister_fixed_factor(ap806_clks[4]); +fail4: + clk_unregister_fixed_factor(ap806_clks[3]); +fail3: + clk_unregister_fixed_rate(ap806_clks[2]); +fail2: + clk_unregister_fixed_rate(ap806_clks[1]); +fail1: + clk_unregister_fixed_rate(ap806_clks[0]); +fail0: + return ret; +} + +static int ap806_syscon_legacy_probe(struct platform_device *pdev) +{ + dev_warn(&pdev->dev, FW_WARN "Using legacy device tree binding\n"); + dev_warn(&pdev->dev, FW_WARN "Update your device tree:\n"); + dev_warn(&pdev->dev, FW_WARN + "This binding won't be supported in future kernel\n"); + + return ap806_syscon_common_probe(pdev, pdev->dev.of_node); + +} + +static int ap806_clock_probe(struct platform_device *pdev) +{ + return ap806_syscon_common_probe(pdev, pdev->dev.of_node->parent); +} + +static const struct of_device_id ap806_syscon_legacy_of_match[] = { + { .compatible = "marvell,ap806-system-controller", }, + { } +}; + +static struct platform_driver ap806_syscon_legacy_driver = { + .probe = ap806_syscon_legacy_probe, + .driver = { + .name = "marvell-ap806-system-controller", + .of_match_table = ap806_syscon_legacy_of_match, + .suppress_bind_attrs = true, + }, +}; +builtin_platform_driver(ap806_syscon_legacy_driver); + +static const struct of_device_id ap806_clock_of_match[] = { + { .compatible = "marvell,ap806-clock", }, + { .compatible = "marvell,ap807-clock", }, + { } +}; + +static struct platform_driver ap806_clock_driver = { + .probe = ap806_clock_probe, + .driver = { + .name = "marvell-ap806-clock", + .of_match_table = ap806_clock_of_match, + .suppress_bind_attrs = true, + }, +}; +builtin_platform_driver(ap806_clock_driver); |