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/*
* Copyright 2008-2010 Freescale Semiconductor, Inc. All Rights Reserved.
*
* The code contained herein is licensed under the GNU General Public
* License. You may obtain a copy of the GNU General Public License
* Version 2 or later at the following locations:
*
* http://www.opensource.org/licenses/gpl-license.html
* http://www.gnu.org/copyleft/gpl.html
*
* This file contains the CPU initialization code.
*/
#include <linux/proc_fs.h>
#include <linux/types.h>
#include <linux/err.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/iram_alloc.h>
#include <linux/io.h>
#include <linux/clk.h>
#include <mach/common.h>
#include <mach/hardware.h>
#include <asm/mach/map.h>
#define CORTEXA8_PLAT_AMC 0x18
#define SRPG_NEON_PUPSCR 0x284
#define SRPG_NEON_PDNSCR 0x288
#define SRPG_ARM_PUPSCR 0x2A4
#define SRPG_ARM_PDNSCR 0x2A8
#define SRPG_EMPGC0_PUPSCR 0x2E4
#define SRPG_EMPGC0_PDNSCR 0x2E8
#define SRPG_EMPGC1_PUPSCR 0x304
#define SRPG_EMPGC1_PDNSCR 0x308
void __iomem *arm_plat_base;
void __iomem *gpc_base;
void __iomem *ccm_base;
void __iomem *databahn_base;
void *wait_in_iram_base;
void (*wait_in_iram)(void *ccm_addr, void *databahn_addr);
extern void mx50_wait(u32 ccm_base, u32 databahn_addr);
static int cpu_silicon_rev = -1;
#define SI_REV 0x48
static void query_silicon_parameter(void)
{
void __iomem *rom = ioremap(IROM_BASE_ADDR, IROM_SIZE);
u32 rev;
if (!rom) {
cpu_silicon_rev = -EINVAL;
return;
}
rev = readl(rom + SI_REV);
switch (rev) {
case 0x1:
cpu_silicon_rev = CHIP_REV_1_0;
break;
case 0x2:
cpu_silicon_rev = CHIP_REV_1_1;
break;
case 0x10:
cpu_silicon_rev = CHIP_REV_2_0;
break;
case 0x20:
cpu_silicon_rev = CHIP_REV_3_0;
break;
default:
cpu_silicon_rev = 0;
}
iounmap(rom);
}
/*
* Returns:
* the silicon revision of the cpu
* -EINVAL - not a mx51
*/
int mx51_revision(void)
{
if (!cpu_is_mx51())
return -EINVAL;
if (cpu_silicon_rev == -1)
query_silicon_parameter();
return cpu_silicon_rev;
}
EXPORT_SYMBOL(mx51_revision);
struct cpu_wp *(*get_cpu_wp)(int *wp);
void (*set_num_cpu_wp)(int num);
static void __init mipi_hsc_disable(void)
{
void __iomem *reg_hsc_mcd = ioremap(MIPI_HSC_BASE_ADDR, SZ_4K);
void __iomem *reg_hsc_mxt_conf = reg_hsc_mcd + 0x800;
struct clk *clk;
uint32_t temp;
/* Temporarily setup MIPI module to legacy mode */
clk = clk_get(NULL, "mipi_hsp_clk");
if (!IS_ERR(clk)) {
clk_enable(clk);
/* Temporarily setup MIPI module to legacy mode */
__raw_writel(0xF00, reg_hsc_mcd);
/* CSI mode reserved*/
temp = __raw_readl(reg_hsc_mxt_conf);
__raw_writel(temp | 0x0FF, reg_hsc_mxt_conf);
if (cpu_is_mx51_rev(CHIP_REV_2_0) > 0) {
temp = __raw_readl(reg_hsc_mxt_conf);
__raw_writel(temp | 0x10000, reg_hsc_mxt_conf);
}
clk_disable(clk);
clk_put(clk);
}
iounmap(reg_hsc_mcd);
}
/*!
* This function resets IPU
*/
void mx5_ipu_reset(void)
{
u32 *reg;
u32 value;
reg = ioremap(MX53_BASE_ADDR(SRC_BASE_ADDR), PAGE_SIZE);
value = __raw_readl(reg);
value = value | 0x8;
__raw_writel(value, reg);
iounmap(reg);
}
void mx5_vpu_reset(void)
{
u32 reg;
void __iomem *src_base;
src_base = ioremap(MX53_BASE_ADDR(SRC_BASE_ADDR), PAGE_SIZE);
/* mask interrupt due to vpu passed reset */
reg = __raw_readl(src_base + 0x18);
reg |= 0x02;
__raw_writel(reg, src_base + 0x18);
reg = __raw_readl(src_base);
reg |= 0x5; /* warm reset vpu */
__raw_writel(reg, src_base);
while (__raw_readl(src_base) & 0x04)
;
iounmap(src_base);
}
static int __init post_cpu_init(void)
{
void __iomem *base;
unsigned int reg;
struct clk *gpcclk = clk_get(NULL, "gpc_dvfs_clk");
int iram_size = IRAM_SIZE;
if (!cpu_is_mx5())
return 0;
if (cpu_is_mx51()) {
mipi_hsc_disable();
#if defined(CONFIG_MXC_SECURITY_SCC) || defined(CONFIG_MXC_SECURITY_SCC_MODULE)
iram_size -= SCC_RAM_SIZE;
#endif
iram_init(MX51_IRAM_BASE_ADDR, iram_size);
} else {
iram_init(MX53_IRAM_BASE_ADDR, iram_size);
}
gpc_base = ioremap(MX53_BASE_ADDR(GPC_BASE_ADDR), SZ_4K);
ccm_base = ioremap(MX53_BASE_ADDR(CCM_BASE_ADDR), SZ_4K);
clk_enable(gpcclk);
/* Setup the number of clock cycles to wait for SRPG
* power up and power down requests.
*/
__raw_writel(0x010F0201, gpc_base + SRPG_ARM_PUPSCR);
__raw_writel(0x010F0201, gpc_base + SRPG_NEON_PUPSCR);
__raw_writel(0x00000008, gpc_base + SRPG_EMPGC0_PUPSCR);
__raw_writel(0x00000008, gpc_base + SRPG_EMPGC1_PUPSCR);
__raw_writel(0x01010101, gpc_base + SRPG_ARM_PDNSCR);
__raw_writel(0x01010101, gpc_base + SRPG_NEON_PDNSCR);
__raw_writel(0x00000018, gpc_base + SRPG_EMPGC0_PDNSCR);
__raw_writel(0x00000018, gpc_base + SRPG_EMPGC1_PDNSCR);
clk_disable(gpcclk);
clk_put(gpcclk);
/* Set ALP bits to 000. Set ALP_EN bit in Arm Memory Controller reg. */
arm_plat_base = ioremap(MX53_BASE_ADDR(ARM_BASE_ADDR), SZ_4K);
reg = 0x8;
__raw_writel(reg, arm_plat_base + CORTEXA8_PLAT_AMC);
base = ioremap(MX53_BASE_ADDR(AIPS1_BASE_ADDR), SZ_4K);
__raw_writel(0x0, base + 0x40);
__raw_writel(0x0, base + 0x44);
__raw_writel(0x0, base + 0x48);
__raw_writel(0x0, base + 0x4C);
reg = __raw_readl(base + 0x50) & 0x00FFFFFF;
__raw_writel(reg, base + 0x50);
iounmap(base);
base = ioremap(MX53_BASE_ADDR(AIPS2_BASE_ADDR), SZ_4K);
__raw_writel(0x0, base + 0x40);
__raw_writel(0x0, base + 0x44);
__raw_writel(0x0, base + 0x48);
__raw_writel(0x0, base + 0x4C);
reg = __raw_readl(base + 0x50) & 0x00FFFFFF;
__raw_writel(reg, base + 0x50);
iounmap(base);
if (cpu_is_mx51() || cpu_is_mx53()) {
/*Allow for automatic gating of the EMI internal clock.
* If this is done, emi_intr CCGR bits should be set to 11.
*/
base = ioremap(MX53_BASE_ADDR(M4IF_BASE_ADDR), SZ_4K);
reg = __raw_readl(base + 0x8c);
reg &= ~0x1;
__raw_writel(reg, base + 0x8c);
iounmap(base);
}
databahn_base = ioremap(MX50_DATABAHN_BASE_ADDR, SZ_16K);
if (cpu_is_mx50()) {
struct clk *ddr_clk = clk_get(NULL, "ddr_clk");
unsigned long iram_paddr;
iram_alloc(SZ_4K, &iram_paddr);
/* Need to remap the area here since we want the memory region
to be executable. */
wait_in_iram_base = __arm_ioremap(iram_paddr,
SZ_4K, MT_HIGH_VECTORS);
memcpy(wait_in_iram_base, mx50_wait, SZ_4K);
wait_in_iram = (void *)wait_in_iram_base;
clk_enable(ddr_clk);
/* Set the DDR to enter automatic self-refresh. */
/* Set the DDR to automatically enter lower power mode 4. */
reg = __raw_readl(databahn_base + DATABAHN_CTL_REG22);
reg &= ~LOWPOWER_AUTOENABLE_MASK;
reg |= 1 << 1;
__raw_writel(reg, databahn_base + DATABAHN_CTL_REG22);
/* set the counter for entering mode 4. */
reg = __raw_readl(databahn_base + DATABAHN_CTL_REG21);
reg &= ~LOWPOWER_EXTERNAL_CNT_MASK;
reg = 128 << LOWPOWER_EXTERNAL_CNT_OFFSET;
__raw_writel(reg, databahn_base + DATABAHN_CTL_REG21);
/* Enable low power mode 4 */
reg = __raw_readl(databahn_base + DATABAHN_CTL_REG20);
reg &= ~LOWPOWER_CONTROL_MASK;
reg |= 1 << 1;
__raw_writel(reg, databahn_base + DATABAHN_CTL_REG20);
clk_disable(ddr_clk);
}
return 0;
}
postcore_initcall(post_cpu_init);
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