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MIPS: BMIPS: Add early CPU initialization code 

Port the stblinux-3.3 code to perform a bunch of CPU-specific initialization,
make it compatible with run-time detection of the CPU, and unroll the
brcmstb-specific macros: BDEV_RB(), BDEV_UNSET.

The "pref 30" disabling is done as a quirk. This is a preliminary change to
allow the use of the "rotr" instruction gated by cpu_has_rixi.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Cc: john@phrozen.org
Cc: cernekee@gmail.com
Cc: jon.fraser@broadcom.com
Cc: pgynther@google.com
Cc: paul.burton@imgtec.com
Cc: ddaney.cavm@gmail.com
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/12504/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Florian Fainelli 2016-02-09 12:55:50 -08:00 committed by Ralf Baechle
parent 036aff91c3
commit 738a3f7902
3 changed files with 89 additions and 0 deletions
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1
arch/mips/bmips/setup.c
View File

@ -111,6 +111,7 @@ static const struct bmips_quirk bmips_quirk_list[] = {
void __init prom_init(void)
{
bmips_cpu_setup();
register_bmips_smp_ops();
}

1
arch/mips/include/asm/bmips.h
View File

@ -88,6 +88,7 @@ extern unsigned long bmips_tp1_irqs;
extern void bmips_ebase_setup(void);
extern asmlinkage void plat_wired_tlb_setup(void);
extern void bmips_cpu_setup(void);
static inline unsigned long bmips_read_zscm_reg(unsigned int offset)
{

87
arch/mips/kernel/smp-bmips.c
View File

@ -566,3 +566,90 @@ asmlinkage void __weak plat_wired_tlb_setup(void)
* once the wired entries are present.
*/
}
void __init bmips_cpu_setup(void)
{
void __iomem __maybe_unused *cbr = BMIPS_GET_CBR();
u32 __maybe_unused cfg;
switch (current_cpu_type()) {
case CPU_BMIPS3300:
/* Set BIU to async mode */
set_c0_brcm_bus_pll(BIT(22));
__sync();
/* put the BIU back in sync mode */
clear_c0_brcm_bus_pll(BIT(22));
/* clear BHTD to enable branch history table */
clear_c0_brcm_reset(BIT(16));
/* Flush and enable RAC */
cfg = __raw_readl(cbr + BMIPS_RAC_CONFIG);
__raw_writel(cfg | 0x100, BMIPS_RAC_CONFIG);
__raw_readl(cbr + BMIPS_RAC_CONFIG);
cfg = __raw_readl(cbr + BMIPS_RAC_CONFIG);
__raw_writel(cfg | 0xf, BMIPS_RAC_CONFIG);
__raw_readl(cbr + BMIPS_RAC_CONFIG);
cfg = __raw_readl(cbr + BMIPS_RAC_ADDRESS_RANGE);
__raw_writel(cfg | 0x0fff0000, cbr + BMIPS_RAC_ADDRESS_RANGE);
__raw_readl(cbr + BMIPS_RAC_ADDRESS_RANGE);
break;
case CPU_BMIPS4380:
/* CBG workaround for early BMIPS4380 CPUs */
switch (read_c0_prid()) {
case 0x2a040:
case 0x2a042:
case 0x2a044:
case 0x2a060:
cfg = __raw_readl(cbr + BMIPS_L2_CONFIG);
__raw_writel(cfg & ~0x07000000, cbr + BMIPS_L2_CONFIG);
__raw_readl(cbr + BMIPS_L2_CONFIG);
}
/* clear BHTD to enable branch history table */
clear_c0_brcm_config_0(BIT(21));
/* XI/ROTR enable */
set_c0_brcm_config_0(BIT(23));
set_c0_brcm_cmt_ctrl(BIT(15));
break;
case CPU_BMIPS5000:
/* enable RDHWR, BRDHWR */
set_c0_brcm_config(BIT(17) | BIT(21));
/* Disable JTB */
__asm__ __volatile__(
" .set noreorder\n"
" li $8, 0x5a455048\n"
" .word 0x4088b00f\n" /* mtc0 t0, $22, 15 */
" .word 0x4008b008\n" /* mfc0 t0, $22, 8 */
" li $9, 0x00008000\n"
" or $8, $8, $9\n"
" .word 0x4088b008\n" /* mtc0 t0, $22, 8 */
" sync\n"
" li $8, 0x0\n"
" .word 0x4088b00f\n" /* mtc0 t0, $22, 15 */
" .set reorder\n"
: : : "$8", "$9");
/* XI enable */
set_c0_brcm_config(BIT(27));
/* enable MIPS32R2 ROR instruction for XI TLB handlers */
__asm__ __volatile__(
" li $8, 0x5a455048\n"
" .word 0x4088b00f\n" /* mtc0 $8, $22, 15 */
" nop; nop; nop\n"
" .word 0x4008b008\n" /* mfc0 $8, $22, 8 */
" lui $9, 0x0100\n"
" or $8, $9\n"
" .word 0x4088b008\n" /* mtc0 $8, $22, 8 */
: : : "$8", "$9");
break;
}
}