diff options
Diffstat (limited to 'arch/unicore32/kernel/clock.c')
| -rw-r--r-- | arch/unicore32/kernel/clock.c | 390 |
1 files changed, 390 insertions, 0 deletions
diff --git a/arch/unicore32/kernel/clock.c b/arch/unicore32/kernel/clock.c new file mode 100644 index 00000000..18d4563e --- /dev/null +++ b/arch/unicore32/kernel/clock.c @@ -0,0 +1,390 @@ +/* + * linux/arch/unicore32/kernel/clock.c + * + * Code specific to PKUnity SoC and UniCore ISA + * + * Maintained by GUAN Xue-tao <gxt@mprc.pku.edu.cn> + * Copyright (C) 2001-2010 Guan Xuetao + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/device.h> +#include <linux/list.h> +#include <linux/errno.h> +#include <linux/err.h> +#include <linux/string.h> +#include <linux/clk.h> +#include <linux/mutex.h> +#include <linux/delay.h> +#include <linux/io.h> + +#include <mach/hardware.h> + +/* + * Very simple clock implementation + */ +struct clk { + struct list_head node; + unsigned long rate; + const char *name; +}; + +static struct clk clk_ost_clk = { + .name = "OST_CLK", + .rate = CLOCK_TICK_RATE, +}; + +static struct clk clk_mclk_clk = { + .name = "MAIN_CLK", +}; + +static struct clk clk_bclk32_clk = { + .name = "BUS32_CLK", +}; + +static struct clk clk_ddr_clk = { + .name = "DDR_CLK", +}; + +static struct clk clk_vga_clk = { + .name = "VGA_CLK", +}; + +static LIST_HEAD(clocks); +static DEFINE_MUTEX(clocks_mutex); + +struct clk *clk_get(struct device *dev, const char *id) +{ + struct clk *p, *clk = ERR_PTR(-ENOENT); + + mutex_lock(&clocks_mutex); + list_for_each_entry(p, &clocks, node) { + if (strcmp(id, p->name) == 0) { + clk = p; + break; + } + } + mutex_unlock(&clocks_mutex); + + return clk; +} +EXPORT_SYMBOL(clk_get); + +void clk_put(struct clk *clk) +{ +} +EXPORT_SYMBOL(clk_put); + +int clk_enable(struct clk *clk) +{ + return 0; +} +EXPORT_SYMBOL(clk_enable); + +void clk_disable(struct clk *clk) +{ +} +EXPORT_SYMBOL(clk_disable); + +unsigned long clk_get_rate(struct clk *clk) +{ + return clk->rate; +} +EXPORT_SYMBOL(clk_get_rate); + +struct { + unsigned long rate; + unsigned long cfg; + unsigned long div; +} vga_clk_table[] = { + {.rate = 25175000, .cfg = 0x00002001, .div = 0x9}, + {.rate = 31500000, .cfg = 0x00002001, .div = 0x7}, + {.rate = 40000000, .cfg = 0x00003801, .div = 0x9}, + {.rate = 49500000, .cfg = 0x00003801, .div = 0x7}, + {.rate = 65000000, .cfg = 0x00002c01, .div = 0x4}, + {.rate = 78750000, .cfg = 0x00002400, .div = 0x7}, + {.rate = 108000000, .cfg = 0x00002c01, .div = 0x2}, + {.rate = 106500000, .cfg = 0x00003c01, .div = 0x3}, + {.rate = 50650000, .cfg = 0x00106400, .div = 0x9}, + {.rate = 61500000, .cfg = 0x00106400, .div = 0xa}, + {.rate = 85500000, .cfg = 0x00002800, .div = 0x6}, +}; + +struct { + unsigned long mrate; + unsigned long prate; +} mclk_clk_table[] = { + {.mrate = 500000000, .prate = 0x00109801}, + {.mrate = 525000000, .prate = 0x00104C00}, + {.mrate = 550000000, .prate = 0x00105000}, + {.mrate = 575000000, .prate = 0x00105400}, + {.mrate = 600000000, .prate = 0x00105800}, + {.mrate = 625000000, .prate = 0x00105C00}, + {.mrate = 650000000, .prate = 0x00106000}, + {.mrate = 675000000, .prate = 0x00106400}, + {.mrate = 700000000, .prate = 0x00106800}, + {.mrate = 725000000, .prate = 0x00106C00}, + {.mrate = 750000000, .prate = 0x00107000}, + {.mrate = 775000000, .prate = 0x00107400}, + {.mrate = 800000000, .prate = 0x00107800}, +}; + +int clk_set_rate(struct clk *clk, unsigned long rate) +{ + if (clk == &clk_vga_clk) { + unsigned long pll_vgacfg, pll_vgadiv; + int ret, i; + + /* lookup vga_clk_table */ + ret = -EINVAL; + for (i = 0; i < ARRAY_SIZE(vga_clk_table); i++) { + if (rate == vga_clk_table[i].rate) { + pll_vgacfg = vga_clk_table[i].cfg; + pll_vgadiv = vga_clk_table[i].div; + ret = 0; + break; + } + } + + if (ret) + return ret; + + if (readl(PM_PLLVGACFG) == pll_vgacfg) + return 0; + + /* set pll vga cfg reg. */ + writel(pll_vgacfg, PM_PLLVGACFG); + + writel(PM_PMCR_CFBVGA, PM_PMCR); + while ((readl(PM_PLLDFCDONE) & PM_PLLDFCDONE_VGADFC) + != PM_PLLDFCDONE_VGADFC) + udelay(100); /* about 1ms */ + + /* set div cfg reg. */ + writel(readl(PM_PCGR) | PM_PCGR_VGACLK, PM_PCGR); + + writel((readl(PM_DIVCFG) & ~PM_DIVCFG_VGACLK_MASK) + | PM_DIVCFG_VGACLK(pll_vgadiv), PM_DIVCFG); + + writel(readl(PM_SWRESET) | PM_SWRESET_VGADIV, PM_SWRESET); + while ((readl(PM_SWRESET) & PM_SWRESET_VGADIV) + == PM_SWRESET_VGADIV) + udelay(100); /* 65536 bclk32, about 320us */ + + writel(readl(PM_PCGR) & ~PM_PCGR_VGACLK, PM_PCGR); + } +#ifdef CONFIG_CPU_FREQ + if (clk == &clk_mclk_clk) { + u32 pll_rate, divstatus = PM_DIVSTATUS; + int ret, i; + + /* lookup mclk_clk_table */ + ret = -EINVAL; + for (i = 0; i < ARRAY_SIZE(mclk_clk_table); i++) { + if (rate == mclk_clk_table[i].mrate) { + pll_rate = mclk_clk_table[i].prate; + clk_mclk_clk.rate = mclk_clk_table[i].mrate; + ret = 0; + break; + } + } + + if (ret) + return ret; + + if (clk_mclk_clk.rate) + clk_bclk32_clk.rate = clk_mclk_clk.rate + / (((divstatus & 0x0000f000) >> 12) + 1); + + /* set pll sys cfg reg. */ + PM_PLLSYSCFG = pll_rate; + + PM_PMCR = PM_PMCR_CFBSYS; + while ((PM_PLLDFCDONE & PM_PLLDFCDONE_SYSDFC) + != PM_PLLDFCDONE_SYSDFC) + udelay(100); + /* about 1ms */ + } +#endif + return 0; +} +EXPORT_SYMBOL(clk_set_rate); + +int clk_register(struct clk *clk) +{ + mutex_lock(&clocks_mutex); + list_add(&clk->node, &clocks); + mutex_unlock(&clocks_mutex); + printk(KERN_DEFAULT "PKUnity PM: %s %lu.%02luM\n", clk->name, + (clk->rate)/1000000, (clk->rate)/10000 % 100); + return 0; +} +EXPORT_SYMBOL(clk_register); + +void clk_unregister(struct clk *clk) +{ + mutex_lock(&clocks_mutex); + list_del(&clk->node); + mutex_unlock(&clocks_mutex); +} +EXPORT_SYMBOL(clk_unregister); + +struct { + unsigned long prate; + unsigned long rate; +} pllrate_table[] = { + {.prate = 0x00002001, .rate = 250000000}, + {.prate = 0x00104801, .rate = 250000000}, + {.prate = 0x00104C01, .rate = 262500000}, + {.prate = 0x00002401, .rate = 275000000}, + {.prate = 0x00105001, .rate = 275000000}, + {.prate = 0x00105401, .rate = 287500000}, + {.prate = 0x00002801, .rate = 300000000}, + {.prate = 0x00105801, .rate = 300000000}, + {.prate = 0x00105C01, .rate = 312500000}, + {.prate = 0x00002C01, .rate = 325000000}, + {.prate = 0x00106001, .rate = 325000000}, + {.prate = 0x00106401, .rate = 337500000}, + {.prate = 0x00003001, .rate = 350000000}, + {.prate = 0x00106801, .rate = 350000000}, + {.prate = 0x00106C01, .rate = 362500000}, + {.prate = 0x00003401, .rate = 375000000}, + {.prate = 0x00107001, .rate = 375000000}, + {.prate = 0x00107401, .rate = 387500000}, + {.prate = 0x00003801, .rate = 400000000}, + {.prate = 0x00107801, .rate = 400000000}, + {.prate = 0x00107C01, .rate = 412500000}, + {.prate = 0x00003C01, .rate = 425000000}, + {.prate = 0x00108001, .rate = 425000000}, + {.prate = 0x00108401, .rate = 437500000}, + {.prate = 0x00004001, .rate = 450000000}, + {.prate = 0x00108801, .rate = 450000000}, + {.prate = 0x00108C01, .rate = 462500000}, + {.prate = 0x00004401, .rate = 475000000}, + {.prate = 0x00109001, .rate = 475000000}, + {.prate = 0x00109401, .rate = 487500000}, + {.prate = 0x00004801, .rate = 500000000}, + {.prate = 0x00109801, .rate = 500000000}, + {.prate = 0x00104C00, .rate = 525000000}, + {.prate = 0x00002400, .rate = 550000000}, + {.prate = 0x00105000, .rate = 550000000}, + {.prate = 0x00105400, .rate = 575000000}, + {.prate = 0x00002800, .rate = 600000000}, + {.prate = 0x00105800, .rate = 600000000}, + {.prate = 0x00105C00, .rate = 625000000}, + {.prate = 0x00002C00, .rate = 650000000}, + {.prate = 0x00106000, .rate = 650000000}, + {.prate = 0x00106400, .rate = 675000000}, + {.prate = 0x00003000, .rate = 700000000}, + {.prate = 0x00106800, .rate = 700000000}, + {.prate = 0x00106C00, .rate = 725000000}, + {.prate = 0x00003400, .rate = 750000000}, + {.prate = 0x00107000, .rate = 750000000}, + {.prate = 0x00107400, .rate = 775000000}, + {.prate = 0x00003800, .rate = 800000000}, + {.prate = 0x00107800, .rate = 800000000}, + {.prate = 0x00107C00, .rate = 825000000}, + {.prate = 0x00003C00, .rate = 850000000}, + {.prate = 0x00108000, .rate = 850000000}, + {.prate = 0x00108400, .rate = 875000000}, + {.prate = 0x00004000, .rate = 900000000}, + {.prate = 0x00108800, .rate = 900000000}, + {.prate = 0x00108C00, .rate = 925000000}, + {.prate = 0x00004400, .rate = 950000000}, + {.prate = 0x00109000, .rate = 950000000}, + {.prate = 0x00109400, .rate = 975000000}, + {.prate = 0x00004800, .rate = 1000000000}, + {.prate = 0x00109800, .rate = 1000000000}, +}; + +struct { + unsigned long prate; + unsigned long drate; +} pddr_table[] = { + {.prate = 0x00100800, .drate = 44236800}, + {.prate = 0x00100C00, .drate = 66355200}, + {.prate = 0x00101000, .drate = 88473600}, + {.prate = 0x00101400, .drate = 110592000}, + {.prate = 0x00101800, .drate = 132710400}, + {.prate = 0x00101C01, .drate = 154828800}, + {.prate = 0x00102001, .drate = 176947200}, + {.prate = 0x00102401, .drate = 199065600}, + {.prate = 0x00102801, .drate = 221184000}, + {.prate = 0x00102C01, .drate = 243302400}, + {.prate = 0x00103001, .drate = 265420800}, + {.prate = 0x00103401, .drate = 287539200}, + {.prate = 0x00103801, .drate = 309657600}, + {.prate = 0x00103C01, .drate = 331776000}, + {.prate = 0x00104001, .drate = 353894400}, +}; + +static int __init clk_init(void) +{ +#ifdef CONFIG_PUV3_PM + u32 pllrate, divstatus = readl(PM_DIVSTATUS); + u32 pcgr_val = readl(PM_PCGR); + int i; + + pcgr_val |= PM_PCGR_BCLKMME | PM_PCGR_BCLKH264E | PM_PCGR_BCLKH264D + | PM_PCGR_HECLK | PM_PCGR_HDCLK; + writel(pcgr_val, PM_PCGR); + + pllrate = readl(PM_PLLSYSSTATUS); + + /* lookup pmclk_table */ + clk_mclk_clk.rate = 0; + for (i = 0; i < ARRAY_SIZE(pllrate_table); i++) { + if (pllrate == pllrate_table[i].prate) { + clk_mclk_clk.rate = pllrate_table[i].rate; + break; + } + } + + if (clk_mclk_clk.rate) + clk_bclk32_clk.rate = clk_mclk_clk.rate / + (((divstatus & 0x0000f000) >> 12) + 1); + + pllrate = readl(PM_PLLDDRSTATUS); + + /* lookup pddr_table */ + clk_ddr_clk.rate = 0; + for (i = 0; i < ARRAY_SIZE(pddr_table); i++) { + if (pllrate == pddr_table[i].prate) { + clk_ddr_clk.rate = pddr_table[i].drate; + break; + } + } + + pllrate = readl(PM_PLLVGASTATUS); + + /* lookup pvga_table */ + clk_vga_clk.rate = 0; + for (i = 0; i < ARRAY_SIZE(pllrate_table); i++) { + if (pllrate == pllrate_table[i].prate) { + clk_vga_clk.rate = pllrate_table[i].rate; + break; + } + } + + if (clk_vga_clk.rate) + clk_vga_clk.rate = clk_vga_clk.rate / + (((divstatus & 0x00f00000) >> 20) + 1); + + clk_register(&clk_vga_clk); +#endif +#ifdef CONFIG_ARCH_FPGA + clk_ddr_clk.rate = 33000000; + clk_mclk_clk.rate = 33000000; + clk_bclk32_clk.rate = 33000000; +#endif + clk_register(&clk_ddr_clk); + clk_register(&clk_mclk_clk); + clk_register(&clk_bclk32_clk); + clk_register(&clk_ost_clk); + return 0; +} +core_initcall(clk_init); |