diff options
Diffstat (limited to 'arch/arm/mach-pxa/pxa3xx.c')
| -rw-r--r-- | arch/arm/mach-pxa/pxa3xx.c | 216 |
1 files changed, 216 insertions, 0 deletions
diff --git a/arch/arm/mach-pxa/pxa3xx.c b/arch/arm/mach-pxa/pxa3xx.c new file mode 100644 index 00000000000..5da798282a5 --- /dev/null +++ b/arch/arm/mach-pxa/pxa3xx.c @@ -0,0 +1,216 @@ +/* + * linux/arch/arm/mach-pxa/pxa3xx.c + * + * code specific to pxa3xx aka Monahans + * + * Copyright (C) 2006 Marvell International Ltd. + * + * 2007-09-02: eric miao <eric.miao@marvell.com> + * initial version + * + * 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/init.h> +#include <linux/pm.h> +#include <linux/platform_device.h> +#include <linux/irq.h> + +#include <asm/hardware.h> +#include <asm/arch/pxa3xx-regs.h> +#include <asm/arch/ohci.h> +#include <asm/arch/pm.h> +#include <asm/arch/dma.h> +#include <asm/arch/ssp.h> + +#include "generic.h" +#include "devices.h" +#include "clock.h" + +/* Crystal clock: 13MHz */ +#define BASE_CLK 13000000 + +/* Ring Oscillator Clock: 60MHz */ +#define RO_CLK 60000000 + +#define ACCR_D0CS (1 << 26) + +/* crystal frequency to static memory controller multiplier (SMCFS) */ +static unsigned char smcfs_mult[8] = { 6, 0, 8, 0, 0, 16, }; + +/* crystal frequency to HSIO bus frequency multiplier (HSS) */ +static unsigned char hss_mult[4] = { 8, 12, 16, 0 }; + +/* + * Get the clock frequency as reflected by CCSR and the turbo flag. + * We assume these values have been applied via a fcs. + * If info is not 0 we also display the current settings. + */ +unsigned int pxa3xx_get_clk_frequency_khz(int info) +{ + unsigned long acsr, xclkcfg; + unsigned int t, xl, xn, hss, ro, XL, XN, CLK, HSS; + + /* Read XCLKCFG register turbo bit */ + __asm__ __volatile__("mrc\tp14, 0, %0, c6, c0, 0" : "=r"(xclkcfg)); + t = xclkcfg & 0x1; + + acsr = ACSR; + + xl = acsr & 0x1f; + xn = (acsr >> 8) & 0x7; + hss = (acsr >> 14) & 0x3; + + XL = xl * BASE_CLK; + XN = xn * XL; + + ro = acsr & ACCR_D0CS; + + CLK = (ro) ? RO_CLK : ((t) ? XN : XL); + HSS = (ro) ? RO_CLK : hss_mult[hss] * BASE_CLK; + + if (info) { + pr_info("RO Mode clock: %d.%02dMHz (%sactive)\n", + RO_CLK / 1000000, (RO_CLK % 1000000) / 10000, + (ro) ? "" : "in"); + pr_info("Run Mode clock: %d.%02dMHz (*%d)\n", + XL / 1000000, (XL % 1000000) / 10000, xl); + pr_info("Turbo Mode clock: %d.%02dMHz (*%d, %sactive)\n", + XN / 1000000, (XN % 1000000) / 10000, xn, + (t) ? "" : "in"); + pr_info("HSIO bus clock: %d.%02dMHz\n", + HSS / 1000000, (HSS % 1000000) / 10000); + } + + return CLK; +} + +/* + * Return the current static memory controller clock frequency + * in units of 10kHz + */ +unsigned int pxa3xx_get_memclk_frequency_10khz(void) +{ + unsigned long acsr; + unsigned int smcfs, clk = 0; + + acsr = ACSR; + + smcfs = (acsr >> 23) & 0x7; + clk = (acsr & ACCR_D0CS) ? RO_CLK : smcfs_mult[smcfs] * BASE_CLK; + + return (clk / 10000); +} + +/* + * Return the current HSIO bus clock frequency + */ +static unsigned long clk_pxa3xx_hsio_getrate(struct clk *clk) +{ + unsigned long acsr; + unsigned int hss, hsio_clk; + + acsr = ACSR; + + hss = (acsr >> 14) & 0x3; + hsio_clk = (acsr & ACCR_D0CS) ? RO_CLK : hss_mult[hss] * BASE_CLK; + + return hsio_clk; +} + +static void clk_pxa3xx_cken_enable(struct clk *clk) +{ + unsigned long mask = 1ul << (clk->cken & 0x1f); + + local_irq_disable(); + + if (clk->cken < 32) + CKENA |= mask; + else + CKENB |= mask; + + local_irq_enable(); +} + +static void clk_pxa3xx_cken_disable(struct clk *clk) +{ + unsigned long mask = 1ul << (clk->cken & 0x1f); + + local_irq_disable(); + + if (clk->cken < 32) + CKENA &= ~mask; + else + CKENB &= ~mask; + + local_irq_enable(); +} + +static const struct clkops clk_pxa3xx_hsio_ops = { + .enable = clk_pxa3xx_cken_enable, + .disable = clk_pxa3xx_cken_disable, + .getrate = clk_pxa3xx_hsio_getrate, +}; + +static struct clk pxa3xx_clks[] = { + INIT_CK("LCDCLK", LCD, &clk_pxa3xx_hsio_ops, &pxa_device_fb.dev), + INIT_CK("CAMCLK", CAMERA, &clk_pxa3xx_hsio_ops, NULL), + + INIT_CKEN("UARTCLK", FFUART, 14857000, 1, &pxa_device_ffuart.dev), + INIT_CKEN("UARTCLK", BTUART, 14857000, 1, &pxa_device_btuart.dev), + INIT_CKEN("UARTCLK", STUART, 14857000, 1, NULL), + + INIT_CKEN("I2CCLK", I2C, 32842000, 0, &pxa_device_i2c.dev), + INIT_CKEN("UDCCLK", UDC, 48000000, 5, &pxa_device_udc.dev), +}; + +void __init pxa3xx_init_irq(void) +{ + /* enable CP6 access */ + u32 value; + __asm__ __volatile__("mrc p15, 0, %0, c15, c1, 0\n": "=r"(value)); + value |= (1 << 6); + __asm__ __volatile__("mcr p15, 0, %0, c15, c1, 0\n": :"r"(value)); + + pxa_init_irq_low(); + pxa_init_irq_high(); + pxa_init_irq_gpio(128); +} + +/* + * device registration specific to PXA3xx. + */ + +static struct platform_device *devices[] __initdata = { + &pxa_device_mci, + &pxa_device_udc, + &pxa_device_fb, + &pxa_device_ffuart, + &pxa_device_btuart, + &pxa_device_stuart, + &pxa_device_i2c, + &pxa_device_i2s, + &pxa_device_ficp, + &pxa_device_rtc, +}; + +static int __init pxa3xx_init(void) +{ + int ret = 0; + + if (cpu_is_pxa3xx()) { + clks_register(pxa3xx_clks, ARRAY_SIZE(pxa3xx_clks)); + + if ((ret = pxa_init_dma(32))) + return ret; + + return platform_add_devices(devices, ARRAY_SIZE(devices)); + } + return 0; +} + +subsys_initcall(pxa3xx_init); |