diff options
Diffstat (limited to 'arch/arm/mach-mx25/clock.c')
| -rw-r--r-- | arch/arm/mach-mx25/clock.c | 219 |
1 files changed, 219 insertions, 0 deletions
diff --git a/arch/arm/mach-mx25/clock.c b/arch/arm/mach-mx25/clock.c new file mode 100644 index 00000000000..ef26951a527 --- /dev/null +++ b/arch/arm/mach-mx25/clock.c @@ -0,0 +1,219 @@ +/* + * Copyright (C) 2009 by Sascha Hauer, Pengutronix + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, + * MA 02110-1301, USA. + */ + +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/list.h> +#include <linux/clk.h> +#include <linux/io.h> + +#include <asm/clkdev.h> + +#include <mach/clock.h> +#include <mach/hardware.h> +#include <mach/common.h> +#include <mach/mx25.h> + +#define CRM_BASE MX25_IO_ADDRESS(MX25_CRM_BASE_ADDR) + +#define CCM_MPCTL 0x00 +#define CCM_UPCTL 0x04 +#define CCM_CCTL 0x08 +#define CCM_CGCR0 0x0C +#define CCM_CGCR1 0x10 +#define CCM_CGCR2 0x14 +#define CCM_PCDR0 0x18 +#define CCM_PCDR1 0x1C +#define CCM_PCDR2 0x20 +#define CCM_PCDR3 0x24 +#define CCM_RCSR 0x28 +#define CCM_CRDR 0x2C +#define CCM_DCVR0 0x30 +#define CCM_DCVR1 0x34 +#define CCM_DCVR2 0x38 +#define CCM_DCVR3 0x3c +#define CCM_LTR0 0x40 +#define CCM_LTR1 0x44 +#define CCM_LTR2 0x48 +#define CCM_LTR3 0x4c + +static unsigned long get_rate_mpll(void) +{ + ulong mpctl = __raw_readl(CRM_BASE + CCM_MPCTL); + + return mxc_decode_pll(mpctl, 24000000); +} + +static unsigned long get_rate_upll(void) +{ + ulong mpctl = __raw_readl(CRM_BASE + CCM_UPCTL); + + return mxc_decode_pll(mpctl, 24000000); +} + +unsigned long get_rate_arm(struct clk *clk) +{ + unsigned long cctl = readl(CRM_BASE + CCM_CCTL); + unsigned long rate = get_rate_mpll(); + + if (cctl & (1 << 14)) + rate = (rate * 3) >> 1; + + return rate / ((cctl >> 30) + 1); +} + +static unsigned long get_rate_ahb(struct clk *clk) +{ + unsigned long cctl = readl(CRM_BASE + CCM_CCTL); + + return get_rate_arm(NULL) / (((cctl >> 28) & 0x3) + 1); +} + +static unsigned long get_rate_ipg(struct clk *clk) +{ + return get_rate_ahb(NULL) >> 1; +} + +static unsigned long get_rate_per(int per) +{ + unsigned long ofs = (per & 0x3) * 8; + unsigned long reg = per & ~0x3; + unsigned long val = (readl(CRM_BASE + CCM_PCDR0 + reg) >> ofs) & 0x3f; + unsigned long fref; + + if (readl(CRM_BASE + 0x64) & (1 << per)) + fref = get_rate_upll(); + else + fref = get_rate_ipg(NULL); + + return fref / (val + 1); +} + +static unsigned long get_rate_uart(struct clk *clk) +{ + return get_rate_per(15); +} + +static unsigned long get_rate_i2c(struct clk *clk) +{ + return get_rate_per(6); +} + +static unsigned long get_rate_nfc(struct clk *clk) +{ + return get_rate_per(8); +} + +static unsigned long get_rate_otg(struct clk *clk) +{ + return 48000000; /* FIXME */ +} + +static int clk_cgcr_enable(struct clk *clk) +{ + u32 reg; + + reg = __raw_readl(clk->enable_reg); + reg |= 1 << clk->enable_shift; + __raw_writel(reg, clk->enable_reg); + + return 0; +} + +static void clk_cgcr_disable(struct clk *clk) +{ + u32 reg; + + reg = __raw_readl(clk->enable_reg); + reg &= ~(1 << clk->enable_shift); + __raw_writel(reg, clk->enable_reg); +} + +#define DEFINE_CLOCK(name, i, er, es, gr, sr) \ + static struct clk name = { \ + .id = i, \ + .enable_reg = CRM_BASE + er, \ + .enable_shift = es, \ + .get_rate = gr, \ + .set_rate = sr, \ + .enable = clk_cgcr_enable, \ + .disable = clk_cgcr_disable, \ + } + +DEFINE_CLOCK(gpt_clk, 0, CCM_CGCR0, 5, get_rate_ipg, NULL); +DEFINE_CLOCK(cspi1_clk, 0, CCM_CGCR1, 5, get_rate_ipg, NULL); +DEFINE_CLOCK(cspi2_clk, 0, CCM_CGCR1, 6, get_rate_ipg, NULL); +DEFINE_CLOCK(cspi3_clk, 0, CCM_CGCR1, 7, get_rate_ipg, NULL); +DEFINE_CLOCK(uart1_clk, 0, CCM_CGCR2, 14, get_rate_uart, NULL); +DEFINE_CLOCK(uart2_clk, 0, CCM_CGCR2, 15, get_rate_uart, NULL); +DEFINE_CLOCK(uart3_clk, 0, CCM_CGCR2, 16, get_rate_uart, NULL); +DEFINE_CLOCK(uart4_clk, 0, CCM_CGCR2, 17, get_rate_uart, NULL); +DEFINE_CLOCK(uart5_clk, 0, CCM_CGCR2, 18, get_rate_uart, NULL); +DEFINE_CLOCK(nfc_clk, 0, CCM_CGCR0, 8, get_rate_nfc, NULL); +DEFINE_CLOCK(usbotg_clk, 0, CCM_CGCR0, 28, get_rate_otg, NULL); +DEFINE_CLOCK(pwm1_clk, 0, CCM_CGCR1, 31, get_rate_ipg, NULL); +DEFINE_CLOCK(pwm2_clk, 0, CCM_CGCR2, 0, get_rate_ipg, NULL); +DEFINE_CLOCK(pwm3_clk, 0, CCM_CGCR2, 1, get_rate_ipg, NULL); +DEFINE_CLOCK(pwm4_clk, 0, CCM_CGCR2, 2, get_rate_ipg, NULL); +DEFINE_CLOCK(kpp_clk, 0, CCM_CGCR1, 28, get_rate_ipg, NULL); +DEFINE_CLOCK(tsc_clk, 0, CCM_CGCR2, 13, get_rate_ipg, NULL); +DEFINE_CLOCK(i2c_clk, 0, CCM_CGCR0, 6, get_rate_i2c, NULL); + +#define _REGISTER_CLOCK(d, n, c) \ + { \ + .dev_id = d, \ + .con_id = n, \ + .clk = &c, \ + }, + +static struct clk_lookup lookups[] = { + _REGISTER_CLOCK("imx-uart.0", NULL, uart1_clk) + _REGISTER_CLOCK("imx-uart.1", NULL, uart2_clk) + _REGISTER_CLOCK("imx-uart.2", NULL, uart3_clk) + _REGISTER_CLOCK("imx-uart.3", NULL, uart4_clk) + _REGISTER_CLOCK("imx-uart.4", NULL, uart5_clk) + _REGISTER_CLOCK("mxc-ehci.0", "usb", usbotg_clk) + _REGISTER_CLOCK("mxc-ehci.1", "usb", usbotg_clk) + _REGISTER_CLOCK("mxc-ehci.2", "usb", usbotg_clk) + _REGISTER_CLOCK("fsl-usb2-udc", "usb", usbotg_clk) + _REGISTER_CLOCK("mxc_nand.0", NULL, nfc_clk) + _REGISTER_CLOCK("spi_imx.0", NULL, cspi1_clk) + _REGISTER_CLOCK("spi_imx.1", NULL, cspi2_clk) + _REGISTER_CLOCK("spi_imx.2", NULL, cspi3_clk) + _REGISTER_CLOCK("mxc_pwm.0", NULL, pwm1_clk) + _REGISTER_CLOCK("mxc_pwm.1", NULL, pwm2_clk) + _REGISTER_CLOCK("mxc_pwm.2", NULL, pwm3_clk) + _REGISTER_CLOCK("mxc_pwm.3", NULL, pwm4_clk) + _REGISTER_CLOCK("mxc-keypad", NULL, kpp_clk) + _REGISTER_CLOCK("mx25-adc", NULL, tsc_clk) + _REGISTER_CLOCK("imx-i2c.0", NULL, i2c_clk) + _REGISTER_CLOCK("imx-i2c.1", NULL, i2c_clk) + _REGISTER_CLOCK("imx-i2c.2", NULL, i2c_clk) +}; + +int __init mx25_clocks_init(unsigned long fref) +{ + int i; + + for (i = 0; i < ARRAY_SIZE(lookups); i++) + clkdev_add(&lookups[i]); + + mxc_timer_init(&gpt_clk, MX25_IO_ADDRESS(MX25_GPT1_BASE_ADDR), 54); + + return 0; +} |